Power tool

Abstract

The application provides an electric tool, belonging to the technical field of electromechanics, comprising: a shell; an output shaft, the output shaft being provided with a first thread; a driving mechanism, comprising: a motor, used for outputting power; a clutch mechanism, comprising: a first clutch disc, a second clutch disc and an elastic element, used for interruptively outputting torque; a torque adjusting mechanism, the torque adjusting mechanism being provided with a second thread, used for cooperating with the first thread to adjust the torque of the electric tool; a locking mechanism, used for selectively locking the torque adjusting mechanism to make the torque adjusting mechanism not rotate with the output shaft and / or the motor; and a limiting mechanism, used for limiting the clutch mechanism from being engaged / disengaged. The application can limit the clutch mechanism from being engaged / disengaged when the torque adjusting mechanism is locked to adjust the torque, thereby improving the accuracy of torque adjustment and the range of adjustable torque. The application can realize automatic adjustment of torque, and the limiting mechanism can avoid the clutch mechanism from being engaged / disengaged during torque adjustment, thereby improving the accuracy of torque adjustment and the range of adjustable torque.

Description

Technical Field

[0001] This application relates to the field of electromechanical technology, and more particularly to an electric tool. Background Technology

[0002] Different types of power tools are used in various industries. Among them, clutch-type torque tools are a common type of tool. Their main feature is that the torque can be set and is adjustable. They are mainly used in the steel structure installation industry, specifically for installing high-strength bolts in steel structures.

[0003] Torque adjustment in known clutch-type torque control tools is achieved either through manual adjustment using external tools or by installing sensor devices. Generally, torque adjustment is achieved through the cooperation of a motor, clutch mechanism, torque adjustment mechanism, and sensor devices. Specifically, the torque adjustment mechanism is first locked to prevent radial rotation, and then the rotation of the motor drives the rotation of the clutch mechanism, causing the torque adjustment mechanism to produce axial displacement, thereby achieving torque adjustment.

[0004] However, due to the structural relationship between the torque adjustment mechanism and the clutch mechanism, when the torque adjustment mechanism is locked, the starting motor may not be able to cause the torque adjustment mechanism to produce axial displacement, which may lead to errors in the automatic torque adjustment or even the inability to adjust the torque. Summary of the Invention

[0005] In view of this, this application provides a power tool that can improve the accuracy of torque adjustment and the range of torque adjustment.

[0006] In a first aspect, embodiments of this application provide an electric tool, the electric tool comprising:

[0007] A housing, wherein the housing is provided with a through hole;

[0008] An output shaft, on which a first thread is provided;

[0009] The drive mechanism includes a motor for outputting power.

[0010] A clutch mechanism, comprising: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interruptibly transmit torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases against the second clutch disc;

[0011] A torque adjustment mechanism is biased by the other end of the elastic element. The torque adjustment mechanism has a second thread, and the torque adjustment mechanism adjusts the biasing force of the elastic element on the second clutch disc by the cooperation of the second thread with the first thread.

[0012] A locking button, which is partially disposed outside the housing through the through hole;

[0013] The locking button has a first end and a second end. The first end can engage with the second groove provided on the torque adjustment mechanism so that the torque adjustment mechanism does not follow the rotation of the output shaft and / or the motor. The second end can abut against the second clutch disc to limit the axial displacement of the second clutch disc within a preset distance range.

[0014] In some embodiments, the locking button is further fitted with a spring, the spring portion passing through the through hole and radially surrounding the locking button, for achieving automatic rebound of the locking button.

[0015] In some embodiments, the clutch mechanism further includes: a clutch assembly, the clutch assembly being configured as a plurality of clutch steel balls, the first clutch disc having a plurality of first grooves, the second clutch disc having a plurality of protrusions, and the clutch steel balls being partially accommodated in the first grooves;

[0016] The first clutch disc transmits torque to the second clutch disc interruptibly through the clutch ball and the protrusion.

[0017] In some embodiments, the clutch mechanism further includes: a clutch assembly, the clutch assembly being configured as a plurality of clutch steel balls, the first clutch disc having a plurality of protrusions, the second clutch disc having a plurality of first grooves, and the clutch steel balls being partially accommodated in the first grooves;

[0018] The first clutch disc can interruptibly transmit torque to the second clutch disc through the protrusion and the clutch ball.

[0019] In some embodiments, the clutch assembly may also be configured as a hemispherical protrusion, which is integrally formed with the first clutch disc or the second clutch disc.

[0020] In some embodiments, the preset distance range is determined based on the height of the protrusion and the diameter of the clutch ball, or the height of the protrusion and the diameter of the hemispherical protrusion. When the axial displacement of the second clutch disc is within the preset distance range, the power tool does not engage the clutch.

[0021] In some embodiments, the power tool further includes:

[0022] The calibration mechanism includes a magnetic component and a magnetic induction component. The magnetic component is fixed on the torque adjustment mechanism, and the magnetic induction component is fixed on the housing and electrically connected to the controller of the power tool.

[0023] The torque adjustment mechanism is provided with a second groove;

[0024] When the magnetic component is sensed by the magnetic induction component, the first end of the locking button can engage with the second groove to prevent the torque adjustment mechanism from rotating with the output shaft and / or the motor, and the second end of the locking button can abut against the second clutch disc to limit the axial displacement of the second clutch disc within a preset distance range.

[0025] In some embodiments, the power tool further includes:

[0026] A torque detection mechanism, comprising: a magnetic component and a magnetic induction component, wherein the magnetic component is fixedly mounted on the torque adjustment mechanism, and the magnetic induction component is fixedly mounted on the housing and electrically connected to the controller of the power tool;

[0027] When the locking button locks the torque adjustment mechanism, the magnetic component can be sensed by the magnetic induction component to detect the axial displacement of the torque adjustment mechanism;

[0028] The displacement is used to determine the torque value of the power tool.

[0029] In some embodiments, the power tool further includes:

[0030] A torque detection mechanism, comprising: a pressure sensor, which is electrically connected to the controller of the power tool and located between the torque adjustment mechanism and the elastic element or between the first clutch disc and the elastic element, for detecting the bias force of the elastic element on the torque adjustment mechanism;

[0031] The bias force is used to determine the torque value of the power tool.

[0032] In some embodiments, the power tool may be provided with a first locking button and a second locking button on the housing, respectively;

[0033] The first locking button can engage with the second groove provided on the torque adjustment mechanism to restrict the radial rotation of the torque adjustment mechanism, and the second locking button can abut against the first clutch disc to restrict the axial movement of the second clutch disc.

[0034] Secondly, embodiments of this application provide a power tool equipped with an external torque adjustment tool, the power tool comprising:

[0035] A housing, wherein the housing is provided with a first through hole and a second through hole;

[0036] An output shaft, on which a first thread is provided;

[0037] The drive mechanism includes a motor for outputting power.

[0038] A clutch mechanism, comprising: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interruptibly transmit torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases against the second clutch disc;

[0039] A torque adjustment mechanism is biased by the other end of the elastic element. The torque adjustment mechanism has a second thread, and the torque adjustment mechanism adjusts the biasing force of the elastic element on the second clutch disc by the cooperation of the second thread with the first thread.

[0040] The torque adjusting tool can pass through the first through hole and / or the second through hole from the outside of the power tool;

[0041] The torque adjusting tool is used to engage with the second groove provided on the torque adjusting mechanism to limit the radial rotation of the torque adjusting mechanism and / or to abut against the first clutch disc to limit the axial displacement of the first clutch disc, so that the power tool does not engage or disengage.

[0042] In some embodiments, the housing is further provided with a cover plate, and a switch is connected to the cover plate. The switch can cooperate with the torque adjusting tool to control the cover plate to open or close the first through hole and the second through hole.

[0043] In some embodiments, the clutch mechanism further includes: a clutch assembly, the clutch assembly being configured as a plurality of clutch steel balls, the first clutch disc having a plurality of first grooves, the second clutch disc having a plurality of protrusions, and the clutch steel balls being partially accommodated in the first grooves;

[0044] The first clutch disc transmits torque to the second clutch disc interruptibly through the clutch ball and the protrusion.

[0045] In some embodiments, the clutch mechanism further includes: a clutch assembly, the clutch assembly being configured as a plurality of clutch steel balls, the first clutch disc having a plurality of protrusions, the second clutch disc having a plurality of first grooves, and the clutch steel balls being partially accommodated in the first grooves;

[0046] The first clutch disc can interruptibly transmit torque to the second clutch disc through the protrusion and the clutch ball.

[0047] In some embodiments, the clutch assembly may also be configured as a hemispherical protrusion, which is integrally formed with the first clutch disc or the second clutch disc.

[0048] In some embodiments, the preset distance range is determined based on the height of the protrusion and the diameter of the clutch ball, or the height of the protrusion and the diameter of the hemispherical protrusion. When the axial displacement of the second clutch disc is within the preset distance range, the power tool does not engage the clutch.

[0049] In some embodiments, the power tool further includes:

[0050] The calibration mechanism includes a magnetic component and a magnetic induction component. The magnetic component is fixed on the torque adjustment mechanism, and the magnetic induction component is fixed on the housing and electrically connected to the controller of the power tool.

[0051] The torque adjustment mechanism is provided with a second groove;

[0052] When the magnetic component is sensed by the magnetic induction component, the torque adjustment tool can engage with the second groove provided on the torque adjustment mechanism to limit the radial rotation of the torque adjustment mechanism and / or abut against the first clutch disc to limit the axial displacement of the first clutch disc, so that the power tool does not engage or disengage.

[0053] In some embodiments, the power tool further includes:

[0054] A torque detection mechanism, comprising: a magnetic component and a magnetic induction component, wherein the magnetic component is fixedly mounted on the torque adjustment mechanism, and the magnetic induction component is fixedly mounted on the housing and electrically connected to the controller of the power tool;

[0055] When the locking button locks the torque adjustment mechanism, the magnetic component can be sensed by the magnetic induction component to detect the axial displacement of the torque adjustment mechanism;

[0056] The displacement is used to determine the torque value of the power tool.

[0057] In some embodiments, the power tool further includes:

[0058] A torque detection mechanism, comprising: a pressure sensor, which is electrically connected to the controller of the power tool and located between the torque adjustment mechanism and the elastic element or between the first clutch disc and the elastic element, for detecting the bias force of the elastic element on the torque adjustment mechanism;

[0059] The bias force is used to determine the torque value of the power tool.

[0060] Thirdly, embodiments of this application provide a power tool, the power tool comprising:

[0061] A housing, wherein the housing is provided with a through hole;

[0062] An output shaft, on which a first thread is provided;

[0063] The drive mechanism includes a motor for outputting power.

[0064] A clutch mechanism, comprising: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interruptibly transmit torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases against the second clutch disc;

[0065] A torque adjustment mechanism is biased by the other end of the elastic element. The torque adjustment mechanism has a second thread, and the torque adjustment mechanism adjusts the biasing force of the elastic element on the second clutch disc by the cooperation of the second thread with the first thread.

[0066] A clutch detection mechanism, comprising: a magnetic induction component, a magnetic component, and a retainer; the retainer abuts against the second clutch disc, the magnetic component is fixed to the retainer, and the magnetic induction component is fixed to the housing;

[0067] A locking button, which is partially disposed outside the housing through the through hole;

[0068] The locking button has a first end and a second end. The first end can engage with the second groove provided on the torque adjustment mechanism so that the torque adjustment mechanism does not follow the rotation of the output shaft and / or the motor. The second end can abut against the cage to limit the axial displacement of the second clutch disc within a preset distance range.

[0069] In some embodiments, when the locking button is in the unlocked state, the retainer may undergo axial displacement with the second clutch disc.

[0070] In some embodiments, the locking button is further fitted with a spring, the spring portion passing through the through hole and radially surrounding the locking button, for achieving automatic rebound of the locking button.

[0071] In some embodiments, the clutch mechanism further includes: a clutch assembly, the clutch assembly being configured as a plurality of clutch steel balls, the first clutch disc having a plurality of first grooves, the second clutch disc having a plurality of protrusions, and the clutch steel balls being partially accommodated in the first grooves;

[0072] The first clutch disc transmits torque to the second clutch disc interruptibly through the clutch ball and the protrusion.

[0073] In some embodiments, the clutch mechanism further includes: a clutch assembly, the clutch assembly being configured as a plurality of clutch steel balls, the first clutch disc having a plurality of protrusions, the second clutch disc having a plurality of first grooves, and the clutch steel balls being partially accommodated in the first grooves;

[0074] The first clutch disc can interruptibly transmit torque to the second clutch disc through the protrusion and the clutch ball.

[0075] In some embodiments, the clutch assembly may also be configured as a hemispherical protrusion, which is integrally formed with the first clutch disc or the second clutch disc.

[0076] In some embodiments, the preset distance range is determined based on the height of the protrusion and the diameter of the clutch ball, or the height of the protrusion and the diameter of the hemispherical protrusion. When the axial displacement of the second clutch disc is within the preset distance range, the power tool does not engage the clutch.

[0077] In some embodiments, the power tool further includes:

[0078] The calibration mechanism includes a magnetic component and a magnetic induction component. The magnetic component is fixed on the torque adjustment mechanism, and the magnetic induction component is fixed on the housing and electrically connected to the controller of the power tool.

[0079] The torque adjustment mechanism is provided with a second groove;

[0080] When the magnetic component is sensed by the magnetic induction component, the first end of the locking button can engage with the second groove to prevent the torque adjustment mechanism from rotating with the output shaft and / or the motor, and the second end of the locking button can abut against the cage to limit the axial displacement of the second clutch disc within a preset distance range.

[0081] In some embodiments, the power tool further includes:

[0082] A torque detection mechanism, comprising: a magnetic component and a magnetic induction component, wherein the magnetic component is fixedly mounted on the torque adjustment mechanism, and the magnetic induction component is fixedly mounted on the housing and electrically connected to the controller of the power tool;

[0083] When the locking button locks the torque adjustment mechanism, the magnetic component can be sensed by the magnetic induction component to detect the axial displacement of the torque adjustment mechanism;

[0084] The displacement is used to determine the torque value of the power tool.

[0085] In some embodiments, the power tool further includes:

[0086] A torque detection mechanism, comprising: a pressure sensor, which is electrically connected to the controller of the power tool and located between the torque adjustment mechanism and the elastic element or between the first clutch disc and the elastic element, for detecting the bias force of the elastic element on the torque adjustment mechanism;

[0087] The bias force is used to determine the torque value of the power tool.

[0088] In some embodiments, the power tool may be provided with a first locking button and a second locking button on the housing, respectively;

[0089] The first locking button can engage with the second groove provided on the torque adjusting mechanism to limit the radial rotation of the torque adjusting mechanism, and the second locking button can abut against the retainer to limit the axial movement of the second clutch disc.

[0090] This application provides an electric tool that can automatically adjust the torque of the electric tool through a torque adjustment mechanism and a locking mechanism. Furthermore, a limit mechanism can restrict the axial displacement of the clutch disc during automatic torque adjustment, preventing clutch engagement during torque adjustment and effectively improving the accuracy of torque adjustment and the adjustable range of torque. Attached Figure Description

[0091] Figure 1 This is a cross-sectional view of a power tool according to an embodiment of this application;

[0092] Figure 2 This is a schematic diagram of the power tool when the locking button A is in the unlocked state in an embodiment of this application;

[0093] Figure 3 This is a schematic diagram of the power tool when the locking button A is in the locked state in an embodiment of this application;

[0094] Figure 4 This is a schematic diagram of the torque detection mechanism 80 and the clutch detection mechanism 90 in the embodiments of this application;

[0095] Figure 5 This is a schematic diagram of the torque detection mechanism 80 and the clutch detection mechanism 90 in another embodiment of this application;

[0096] Figure 6 This is a schematic diagram of the torque detection mechanism 80 and the clutch detection mechanism 90 in another embodiment of this application;

[0097] Figure 7 This is a schematic diagram of the structure of the power tool housing 10 according to an embodiment of this application;

[0098] Figures 8-9 This is a schematic diagram of the clutch disc structure in an embodiment of this application;

[0099] Figure 10 This is a schematic diagram of the structure of the torque adjustment mechanism 50 in the embodiments of this application;

[0100] Figure 11 This is a schematic diagram of the structure of the power tool housing 10 in another embodiment of this application;

[0101] Figure 12 This is a schematic diagram of the structure of the torque adjusting tool C in the embodiments of this application;

[0102] Figure 13 This is a schematic diagram of the power tool in another embodiment of the present application when the torque adjustment mechanism and the second clutch disc 402 are in the locked state;

[0103] Figure 14 This is a schematic diagram of the power tool in another embodiment of the present application when the torque adjustment mechanism and the second clutch disc 402 are in the unlocked state;

[0104] Figure 15 This is a schematic diagram of the structure of a power tool with a locking button D according to an embodiment of this application;

[0105] Figure 16 This is a schematic diagram of the power tool when the locking button D is in the unlocked state in an embodiment of this application;

[0106] Figure 17 This is a schematic diagram of the power tool when the locking button D is in the locked state in an embodiment of this application;

[0107] Figure 18 This is a schematic diagram of the structure of a DC constant torque wrench according to an embodiment of this application;

[0108] Figure 19 This is a schematic diagram of the structure of an AC torque wrench according to an embodiment of this application;

[0109] Figure 20 This is a functional block diagram of a control system for a power tool according to an embodiment of this application;

[0110] Figure 21 This is a circuit diagram of an electric tool according to an embodiment of this application;

[0111] Figure 22 This is a circuit diagram of an electric tool according to another embodiment of this application;

[0112] Figure 23 This is a flowchart illustrating a torque adjustment method for an electric tool according to an embodiment of this application;

[0113] Figure 24This is a flowchart illustrating a torque adjustment method for an electric tool according to another embodiment of this application;

[0114] Figure 25 This is a schematic diagram of the clutch disc and clutch ball in an embodiment of this application;

[0115] Figure 26 This is a flowchart illustrating a torque adjustment method for an electric tool according to another embodiment of this application;

[0116] Figure 27 This is a flowchart illustrating a torque adjustment method for an electric tool according to another embodiment of this application;

[0117] Figure 28 This is a flowchart illustrating a torque calibration method for an electric tool according to an embodiment of this application;

[0118] Figure 29 This is a flowchart illustrating a control method for an electric tool according to an embodiment of this application.

[0119] The attached diagram is labeled as follows:

[0120] Housing 10, output shaft 20, first thread 201, drive mechanism 30, motor 301, transmission assembly 302, clutch mechanism 40, first clutch disc 401, first groove 4011, second clutch disc 402, protrusion 4021, elastic element 403, clutch assembly 404, torque adjustment mechanism 50, adjusting nut 501, second thread 503, second groove 504, torque adjustment gear 502, locking mechanism 60, limit mechanism 70, locking button A, through hole B, spring a, lock Fixed button D, through hole E, spring d, torque detection mechanism 80, magnetic component 801, magnetic induction component 802, magnetic induction component 803, pressure sensor 804, plane bearing 805, gasket 806, clutch detection mechanism 90, magnetic component 901, magnetic induction component 902, retainer 903, spring 904, first through hole 101, second through hole 102, switch 103, cover plate 104, torque adjustment tool C, battery pack 200, power cord 300, display screen 400. Detailed Implementation

[0121] To make the technical solution and beneficial effects of the present invention more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0122] This disclosure is not exhaustive, but merely illustrative of some embodiments, and is not intended to limit the scope of protection of this disclosure. Unless otherwise specified, each step in a particular embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a particular embodiment can also be implemented as an independent embodiment, and the order of the steps in a particular embodiment can be arbitrarily interchanged. Furthermore, the optional implementation methods in a particular embodiment can be arbitrarily combined; moreover, the embodiments can be arbitrarily combined, for example, some or all steps of different embodiments can be arbitrarily combined, and a particular embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0123] In each of the disclosed embodiments, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of the embodiments are consistent and can be referenced by each other. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0124] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure.

[0125] In this embodiment of the disclosure, unless otherwise stated, elements expressed in the singular form, such as "a," "an," "the," "the," "the," "the," "the," "the," "this," etc., can mean "one and only one," or "one or more," "at least one," etc. For example, when using articles such as "a," "an," "the," etc. in translation, the noun following the article can be understood as either a singular expression or a plural expression.

[0126] In the embodiments disclosed herein, "multiple" refers to two or more.

[0127] In some embodiments, the terms “at least one of”, “one or more”, “a plurality of”, “multiple”, etc., may be used interchangeably.

[0128] The prefixes "first," "second," etc., used in the embodiments of this disclosure are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, value, or content of the descriptive objects. The description of the descriptive objects should be found in the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is a "field," the ordinal numbers preceding "field" in "first field" and "second field" do not restrict the position or order of the "fields." "First" and "second" do not restrict whether the "fields" they modify are in the same message, nor do they restrict the order of "first field" and "second field." Similarly, if the descriptive object is a "level," the ordinal numbers preceding "level" in "first level" and "second level" do not restrict the priority between "levels." Furthermore, the value of the descriptive object is not limited by ordinal numbers and can be one or more. For example, in "first device," the value of "device" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the object being described is "device", then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Similarly, if the object being described is "information", then "first information" and "second information" can be the same information or different information, and their content can be the same or different.

[0129] In some embodiments, terms such as “…”, “determine…”, “in the case of…”, “when…”, “when…”, “if…”, etc. can be used interchangeably.

[0130] In some embodiments, the terms “greater than,” “greater than or equal to,” “not less than,” “more than,” “more than or equal to,” “not less than,” “higher than,” “higher than or equal to,” “not lower than,” and “above” can be used interchangeably, as can the terms “less than,” “less than or equal to,” “not greater than,” “less than,” “less than or equal to,” “not more than,” “lower than,” “lower than or equal to,” “not higher than,” and “below”.

[0131] Furthermore, each element, each row, or each column in the embodiments of this disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0132] Example 1:

[0133] In one possible implementation, such as Figure 1 As shown, the power tool includes:

[0134] The housing 10 contains an output shaft 20, a drive mechanism 30, a clutch mechanism 40, a torque adjustment mechanism 50, a torque detection mechanism 80, a clutch detection mechanism 90, and a calibration mechanism.

[0135] The output shaft 20 is provided with a first thread 201. The drive mechanism 30 includes a motor 301 and a transmission assembly 302. The clutch mechanism 40 includes a first clutch disc 401, a second clutch disc 402, an elastic element 403, and a clutch assembly 404. The torque adjustment mechanism 50 includes an adjusting nut 501 and a torque adjustment gear disc 502. The adjusting nut 501 is also provided with a second thread 503. The torque detection mechanism 80 includes a magnetic component 801 and a magnetic induction component 802. The calibration mechanism includes a magnetic component 801 and a magnetic induction component 802.

[0136] Specifically, the motor 301 is connected to the transmission assembly 302, and the transmission assembly 302 is connected to the first clutch disc 401. The first clutch disc 401 can interruptibly transmit the torque output by the motor 301 to the second clutch disc 402 through the clutch assembly 404. The elastic element 403 is arranged around the output shaft 20. One end of the elastic element 403 biases the second clutch disc 402, and the other end of the elastic element 403 biases the torque adjustment mechanism 50. The torque adjustment mechanism 50 has a second thread 503. By cooperating with the first thread 201, the biasing force of the elastic element 403 on the second clutch disc 402 can be adjusted to realize the torque adjustment of the power tool. The locking mechanism 60 (not shown in the figure) is used to selectively lock the torque adjustment mechanism 50 so that the torque adjustment mechanism 50 does not rotate with the output shaft 20 and / or the motor 301. The limiting mechanism 70 (not shown in the figure) is used to limit the second clutch disc 402 so that the axial displacement of the second clutch disc 402 is within a preset distance range.

[0137] When the power tool adjusts its torque, the torque adjustment mechanism 50 is first locked by the locking mechanism 60 and the axial movement of the second clutch disc 402 is limited by the limiting mechanism 70. Then, the motor 301 is started. As the motor 301 drives the output shaft 20 to rotate, the torque adjustment mechanism 50 is displaced axially through the threaded engagement, thereby changing the bias force of the elastic element 403. When the bias force corresponding to the set torque is reached, the motor 301 stops. This realizes the automatic adjustment of the power tool's torque and improves the accuracy and adjustable range of the torque adjustment.

[0138] It should be noted that when the axial displacement of the second clutch disc 402 is within the preset distance range, the power tool will never engage the clutch.

[0139] In one possible implementation, the power tool further includes a locking state detection mechanism (not shown in the figures), which includes a magnetic component and a magnetic induction component. The magnetic component is disposed on the locking mechanism 60 and / or the limiting mechanism 70, and the magnetic induction component is disposed on the housing of the power tool. The locking state detection mechanism is used to detect and identify whether the locking mechanism 60 is in a locked state and / or whether the limiting mechanism 70 is in a limited state.

[0140] In one possible implementation, the torque detection mechanism 80 includes: a magnetic component 801 and one or more magnetic induction components (magnetic induction component 802 and magnetic induction component 803). The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the magnetic induction component 802 is fixed on the housing 10 and electrically connected to the controller. When the locking mechanism 60 locks the torque adjustment mechanism 50, the magnetic component 801 can be sensed by the magnetic induction component 802 (first magnetic induction component) and the magnetic induction component 803 (second magnetic induction component) to detect the axial displacement of the torque adjustment mechanism 50. The axial displacement of the torque adjustment mechanism 50 is equal to the compression change of the elastic element 403, so the torque value of the power tool can be calculated based on the axial displacement.

[0141] It should be noted that the magnetic induction ranges of magnetic induction components 802 and 803 at least partially overlap each other and cover the movable range of the torque adjustment mechanism 50.

[0142] In another possible implementation (not shown in the figures), the torque detection mechanism 80 includes: a magnetic component 801 and three magnetic induction components (i.e., a first magnetic induction component, a second magnetic induction component, and a third magnetic induction component) arranged sequentially in the axial direction. The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the three magnetic induction components are fixed on the housing 10 and electrically connected to the controller. When the locking mechanism 60 locks the torque adjustment mechanism 50, the magnetic component 801 can be sensed by the three magnetic induction components to detect the axial displacement of the torque adjustment mechanism 50. The axial displacement of the torque adjustment mechanism 50 is equal to the compression change of the elastic element 403, so the torque value of the power tool can be calculated based on the axial displacement.

[0143] It should be noted that the first magnetic induction component has a first sensing range, the second magnetic induction component has a second sensing range, and the third magnetic induction component has a third sensing range; the first sensing range, the second sensing range, and the third sensing range at least partially overlap and cover the movable range of the torque adjustment mechanism 50.

[0144] In one possible implementation, such as Figure 1 and Figure 10As shown: The calibration mechanism includes a magnetic component 801 and a magnetic induction component 802. The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the magnetic induction component 802 is fixed on the housing 10 and electrically connected to the controller. The torque adjustment mechanism 50 is provided with a second groove 504. When the magnetic component 801 is sensed by the magnetic induction component 802, the locking mechanism 60 can engage with the second groove 504.

[0145] Optionally, multiple grooves are provided on the torque adjustment mechanism 50 and matched with corresponding magnetic components. When the magnetic component is sensed by the magnetic induction component, the locking mechanism 60 can engage with one of the multiple grooves.

[0146] It should be noted that the calibration mechanism may not share the magnetic component 801 and the magnetic induction component 802 with the torque detection mechanism 80. The magnetic component and the magnetic induction component can be set separately. As long as the magnetic component is sensed by the magnetic induction component, the locking mechanism 60 can engage with the second groove 504.

[0147] In another possible implementation, the torque adjustment mechanism 50 is provided with multiple grooves (not shown in the figure), and a switchable window is provided on the housing 10. The positions of the multiple grooves can be observed through the window. When the motor is started, the operator can observe the position of the grooves through the window and manually control the rotation of the motor so that one of the grooves is in the relative position of the locking mechanism 60. At this time, the locking mechanism 60 can engage with the second groove 504.

[0148] In one possible implementation, the power tool further includes a clutch detection mechanism 90, which includes a magnetic component 901 fixed to the housing 10 and axially movable, and a magnetic induction component 902 disposed on the housing 10. When the power tool reaches a set torque and engages, the second clutch disc 402 drives the magnetic component 901 to move axially, so that the magnetic component 901 can be sensed by the magnetic induction component 902. When the magnetic component 901 is sensed by the magnetic induction component 902, a clutch signal is generated. When the controller receives the clutch signal, it determines that the power tool has engaged and executes a stop operation or other preset operation commands.

[0149] In one possible implementation, the power tool is also provided with an operating interface, which can be located on the rear shell of the housing 10 or on the base of the housing 10. The operating interface is used to input commands to control the power tool to enter the torque adjustment mode. When the power tool enters the torque adjustment mode, the light unit on the power tool flashes or the sound control unit beeps to remind the user, making it easier for the user to operate and improving the user experience.

[0150] In one possible implementation, the power tool further includes: a controller located inside the housing 10 and electrically connected to the motor 301, the controller having a storage unit for storing the correspondence between the compression amount of the elastic element 403 and the torque value, for calculating the torque value when adjusting the torque.

[0151] In another possible implementation, the drive mechanism 30 may not include the transmission assembly 302, and directly drive the first clutch disc 401 to rotate via the motor 301, and the first clutch disc 401 may interrupt the transmission of torque to the second clutch disc 402.

[0152] In another possible implementation, the clutch mechanism 40 may not include the clutch assembly 404. The clutch is engaged or disengaged by the shape matching of the first clutch disc 401 and the second clutch disc 402. For example, a hemispherical protrusion 4021 is provided on the first clutch disc 401 and a stepped portion is provided on the second clutch disc 402. When the output torque of the power tool exceeds the set torque value, the protrusion 4021 can pass over the stepped portion to achieve the clutch effect.

[0153] In another possible implementation, the elastic element 403 can be configured as a spring arranged around the output shaft 20 (the output shaft 20 passes through the interior of the spring), or it can be configured as a plurality of springs arranged around the output shaft 20 (the plurality of springs are spaced apart on the outer periphery of the output shaft 20).

[0154] In another possible implementation, such as Figure 6 As shown, the torque detection mechanism 80 can be configured as a pressure sensor 804, a plane bearing 805, and a gasket 806. The pressure sensor 804 is electrically connected to the controller and is located between the torque adjustment mechanism 50 and the elastic element 403. It is used to detect the bias force of the elastic element 403 on the torque adjustment mechanism 50. The controller then calculates the torque value of the power tool based on the detected pressure value.

[0155] Optionally, the pressure sensor 804 can also be located between the first clutch disc 401 and the elastic element 403 to detect the bias force of the elastic element 403 on the first clutch disc 401. The controller then calculates the torque value of the power tool based on the detected pressure value.

[0156] In one possible implementation, a limiting mechanism may not be provided. The frictional force between the inner wall of the torque adjusting mechanism 50 and the first thread 201 of the output shaft 20, as well as the clutch torque of the clutch mechanism 40, are calculated when the torque adjusting mechanism 50 is locked. This ensures that the clutch torque is always greater than the frictional force, thus guaranteeing that the clutch mechanism 40 does not engage during torque adjustment.

[0157] Example 2:

[0158] In one possible implementation, such as Figure 1As shown, the power tool includes:

[0159] The housing 10 contains an output shaft 20, a drive mechanism 30, a clutch mechanism 40, a torque adjustment mechanism 50, a torque detection mechanism 80, a clutch detection mechanism 90, and a calibration mechanism.

[0160] The output shaft 20 is provided with a first thread 201. The drive mechanism 30 includes a motor 301. The clutch mechanism 40 includes a first clutch disc 401, a second clutch disc 402, and an elastic element 403. The torque adjustment mechanism 50 includes an adjusting nut 501 and a torque adjustment gear disc 502. The adjusting nut 501 is also provided with a second thread 503. The torque detection mechanism 80 includes a magnetic component 801 and a magnetic induction component 802. The calibration mechanism includes a magnetic component 801 and a magnetic induction component 802.

[0161] Specifically, the motor 301 drives the first clutch disc 401 to rotate, and the first clutch disc 401 can intermittently transmit torque to the second clutch disc 402. The elastic element 403 is arranged around the output shaft 20. One end of the elastic element 403 biases the second clutch disc 402, and the other end of the elastic element 403 biases the torque adjustment mechanism 50. The torque adjustment mechanism 50 has a second thread 503. By cooperating with the first thread 201, the biasing force of the elastic element 403 on the second clutch disc 402 can be adjusted to realize the torque adjustment of the power tool. The locking mechanism 60 is used to selectively lock the torque adjustment mechanism 50 so that the torque adjustment mechanism 50 does not follow the rotation of the output shaft 20 and / or the motor 301. The limiting mechanism 70 is used to limit the second clutch disc 402 so that the axial displacement of the second clutch disc 402 is within a preset distance range. This realizes the automatic adjustment of the power tool torque and improves the accuracy and adjustable range of torque adjustment.

[0162] In one possible implementation, such as Figure 1 , Figure 8 and Figure 9 As shown, the clutch mechanism 40 further includes a clutch assembly 404, which is configured with a plurality of clutch steel balls. The first clutch disc 401 is provided with a plurality of first grooves 4011, and the second clutch disc 402 is provided with a plurality of protrusions 4021. The clutch steel balls are partially accommodated in the first grooves 4011. The first clutch disc 401 can interruptibly transmit torque to the second clutch disc 402 through the clutch steel balls and the protrusions 4021.

[0163] Optionally, a plurality of protrusions 4021 may be provided on the first clutch disc 401, and a plurality of first grooves 4011 may be provided on the second clutch disc 402, with the clutch steel ball partially accommodated in the first groove 4011; the first clutch disc 401 may transmit torque to the second clutch disc 402 intermittently through the protrusions 4021 and the clutch steel ball.

[0164] It should be noted that the above-mentioned preset distance range is calculated and determined based on the height (h) of the protrusion 4021 and the diameter (d) of the clutch steel ball. The preset distance range is [h, h+d). When the axial displacement of the second clutch disc 402 is within the preset distance range, the power tool will never engage the clutch.

[0165] In one possible implementation, such as Figure 2 , Figure 3 , Figure 7 and Figure 10 As shown, the locking mechanism 60 and the limiting mechanism 70 can be configured as: a locking button A and a spring a; the locking button A is partially disposed outside the housing 10 through a through hole B provided on the housing 10; the locking button A has a first end (locking mechanism 60) and a second end (limiting mechanism 70), the first end can engage with the second groove 504 provided on the torque adjusting mechanism 50 to limit the radial rotation of the torque adjusting mechanism 50, and the second end can abut against the second clutch disc 402 to limit the axial movement of the second clutch disc 402;

[0166] Spring a passes through the through hole B and radially surrounds the locking button A to achieve automatic rebound of the locking button A.

[0167] It should be noted that the through hole B provided on the housing 10 can be located directly above the housing 10 or on both sides of the housing 10.

[0168] like Figure 2 As shown, when the locking button A is in the unlocked state, the spring a is in the uncompressed state, and the torque adjustment mechanism 50 can rotate with the output shaft 20. When the output torque of the power tool reaches the set torque, the second clutch disc 402 can move axially to achieve clutch engagement.

[0169] like Figure 3 As shown, when the locking button A is in the locked state, the spring a is in the compressed state. The first end of the locking button A engages with the second groove 504, and the second end abuts against the second clutch disc 402. At this time, the torque adjustment mechanism 50 cannot rotate with the output shaft 20. When the output torque of the power tool reaches the set torque, the second clutch disc 402 cannot move axially, so the power tool cannot engage or disengage.

[0170] When the locking button A is in the locked state, the motor 301 is started. As the motor 301 drives the output shaft 20 to rotate, the torque adjustment mechanism 50 is displaced axially through the threaded engagement, thereby changing the bias force of the elastic element 403. When the bias force corresponding to the set torque is reached, the motor 301 stops.

[0171] In one possible implementation, before the locking button A enters the locked state, a calibration mechanism is needed to align the second groove 504 with the first end of the locking button A, such as... Figure 4 and Figure 10 As shown:

[0172] The calibration mechanism includes a magnetic component 801 and a magnetic induction component 802. The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the magnetic induction component 802 is fixed on the housing 10 and electrically connected to the controller. The torque adjustment mechanism 50 is provided with a second groove 504. When the magnetic component 801 is sensed by the magnetic induction component 802, the locking mechanism 60 can engage with the second groove 504.

[0173] Optionally, multiple grooves are provided on the torque adjustment mechanism 50 and matched with corresponding magnetic components. When the magnetic component is sensed by the magnetic induction component, the locking mechanism 60 can engage with one of the multiple grooves.

[0174] It should be noted that the calibration mechanism may not share the magnetic component 801 and the magnetic induction component 802 with the torque detection mechanism 80. The magnetic component and the magnetic induction component can be set separately. As long as the magnetic component is sensed by the magnetic induction component, the locking mechanism 60 can engage with the second groove 504.

[0175] In another possible implementation, the torque adjustment mechanism 50 is provided with multiple grooves (not shown in the figure), and a switchable window is provided on the housing 10. The positions of the multiple grooves can be observed through the window. When the motor is started, the operator can observe the position of the grooves through the window and manually control the rotation of the motor so that one of the grooves is in the relative position of the locking mechanism 60. At this time, the locking mechanism 60 can engage with the second groove 504.

[0176] Optionally, the starter motor 301 drives the output shaft 20 to rotate, thereby driving the torque adjustment mechanism 50 to rotate. When the magnetic component 801 is sensed by the magnetic induction component 802, the motor 301 is controlled to stop. At this time, the second groove 504 corresponds to the first end of the locking button A, and the locking button A can be pressed.

[0177] Specifically, when the torque adjustment mechanism 50 is not locked, it can rotate with the output shaft, which is driven by a motor. At this time, the magnetic component 801 on the torque adjustment mechanism 50 rotates circumferentially with the motor. When the magnetic component 801 is sensed by the magnetic induction component 802, a Hall signal is generated. When the power tool controller receives this Hall signal, it sends a brake command to the motor, controlling it to stop rotating in time, so that the second groove 504 stops at the position corresponding to the first end of the locking button A. At this point, the locking button A can be manually or automatically engaged with the second groove 504.

[0178] Optionally, a baffle is provided on the housing 10, which is located directly above the torque adjustment mechanism 50. When calibration is required, the baffle is opened and the motor 301 is started. When the second groove 504 is seen to be directly below the locking button A, the motor 301 is stopped and the locking button A can be pressed.

[0179] In one possible implementation, the power tool further includes a locking state detection mechanism (not shown in the figures), which includes a magnetic component and a magnetic induction component. The magnetic component is disposed on the locking button A, and the magnetic induction component is disposed on the housing of the power tool. The locking state detection mechanism is used to detect and identify whether the locking button A is in a locked state.

[0180] In one possible implementation, the torque detection mechanism 80 includes a magnetic component 801 and a magnetic induction component 802. The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the magnetic induction component 802 is fixed on the housing 10 and electrically connected to the controller. When the torque adjustment mechanism 50 is locked, the magnetic component 801 can be sensed by the magnetic induction component 802 to detect the axial displacement of the torque adjustment mechanism 50. The axial displacement of the torque adjustment mechanism 50 is equal to the compression change of the elastic element 403, so the torque value of the power tool can be calculated based on the axial displacement.

[0181] The power tool also includes a clutch detection mechanism 90, which includes a magnetic component 901 fixed to the housing 10 and axially movable, and a magnetic induction component 902 disposed on the housing 10. When the power tool reaches a set torque and engages, the second clutch disc 402 drives the magnetic component 901 to move axially, so that the magnetic component 901 can be sensed by the magnetic induction component 902. When the magnetic component 901 is sensed by the magnetic induction component 902, a clutch signal is generated. When the controller receives the clutch signal, it determines that the power tool has engaged and executes a stop operation or other preset operation commands.

[0182] In another possible implementation, such as Figure 5As shown, the torque detection mechanism 80 can be configured as a magnetic component 801 and multiple magnetic induction components (magnetic induction component 802 and magnetic induction component 803). The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the magnetic induction component 802 is fixed on the housing 10 and electrically connected to the controller. When the torque adjustment mechanism 50 is locked, the magnetic component 801 can be sensed by the magnetic induction component 802 (first magnetic induction component) and the magnetic induction component 803 (second magnetic induction component) to detect the axial displacement of the torque adjustment mechanism 50. The axial displacement of the torque adjustment mechanism 50 is equal to the compression change of the elastic element 403, so the torque value of the power tool can be calculated based on the axial displacement. By setting multiple magnetic induction components (magnetic induction component 802 and magnetic induction component 803), the axial displacement of the torque adjustment mechanism 50 can be detected more accurately, and the detectable displacement range is also larger, improving the accuracy of tool torque adjustment and the torque adjustable range.

[0183] It should be noted that the magnetic induction ranges of magnetic induction components 802 and 803 at least partially overlap each other and cover the movable range of the torque adjustment mechanism 50.

[0184] In another possible implementation (not shown in the figures), the torque detection mechanism 80 includes: a magnetic component 801 and three magnetic induction components (i.e., a first magnetic induction component, a second magnetic induction component, and a third magnetic induction component) arranged sequentially in the axial direction. The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the three magnetic induction components are fixed on the housing 10 and electrically connected to the controller. When the locking mechanism 60 locks the torque adjustment mechanism 50, the magnetic component 801 can be sensed by the three magnetic induction components to detect the axial displacement of the torque adjustment mechanism 50. The axial displacement of the torque adjustment mechanism 50 is equal to the compression change of the elastic element 403, so the torque value of the power tool can be calculated based on the axial displacement.

[0185] It should be noted that the first magnetic induction component has a first sensing range, the second magnetic induction component has a second sensing range, and the third magnetic induction component has a third sensing range; the first sensing range, the second sensing range, and the third sensing range at least partially overlap and cover the movable range of the torque adjustment mechanism 50.

[0186] In another possible implementation, such as Figure 6 As shown, the torque detection mechanism 80 can be configured as a pressure sensor 804, a plane bearing 805, and a gasket 806. The pressure sensor 804 is electrically connected to the controller and is located between the torque adjustment mechanism 50 and the elastic element 403. It is used to detect the bias force of the elastic element 403 on the torque adjustment mechanism 50. The controller then calculates the torque value of the power tool based on the detected pressure value.

[0187] Optionally, the pressure sensor 804 can also be located between the first clutch disc 401 and the elastic element 403 to detect the bias force of the elastic element 403 on the first clutch disc 401. The controller then calculates the torque value of the power tool based on the detected pressure value.

[0188] In one possible implementation, the power tool is also provided with an operating interface, which can be located on the rear shell of the housing 10 or on the base of the housing 10. The operating interface is used to input commands to control the power tool to enter the torque adjustment mode. When the power tool enters the torque adjustment mode, the light unit on the power tool flashes or the sound control unit beeps to remind the user, making it easier for the user to operate and improving the user experience.

[0189] In one possible implementation, the power tool further includes: a controller located inside the housing 10 and electrically connected to the motor 301, the controller having a storage unit for storing the correspondence between the compression amount of the elastic element 403 and the torque value, for calculating the torque value when adjusting the torque.

[0190] Example 3:

[0191] In one possible implementation, such as Figure 1 As shown, the power tool includes:

[0192] The housing 10 contains an output shaft 20, a drive mechanism 30, a clutch mechanism 40, a torque adjustment mechanism 50, a torque detection mechanism 80, a clutch detection mechanism 90, and a calibration mechanism.

[0193] The output shaft 20 is provided with a first thread 201. The drive mechanism 30 includes a motor 301. The clutch mechanism 40 includes a first clutch disc 401, a second clutch disc 402, and an elastic element 403. The torque adjustment mechanism 50 includes an adjusting nut 501 and a torque adjustment gear disc 502. The adjusting nut 501 is also provided with a second thread 503. The torque detection mechanism 80 includes a magnetic component 801 and a magnetic induction component 802. The calibration mechanism includes a magnetic component 801 and a magnetic induction component 802.

[0194] Specifically, the motor 301 drives the first clutch disc 401 to rotate, and the first clutch disc 401 can intermittently transmit torque to the second clutch disc 402. The elastic element 403 is arranged around the output shaft 20. One end of the elastic element 403 biases the second clutch disc 402, and the other end of the elastic element 403 biases the torque adjustment mechanism 50. The torque adjustment mechanism 50 has a second thread 503. By cooperating with the first thread 201, the biasing force of the elastic element 403 on the second clutch disc 402 can be adjusted to realize the torque adjustment of the power tool. The locking mechanism 60 is used to selectively lock the torque adjustment mechanism 50 so that the torque adjustment mechanism 50 does not follow the rotation of the output shaft 20 and / or the motor 301. The limiting mechanism 70 is used to limit the second clutch disc 402 so that the axial displacement of the second clutch disc 402 is within a preset distance range. This realizes the automatic adjustment of the power tool torque and improves the accuracy and adjustable range of torque adjustment.

[0195] In one possible implementation, such as Figure 1 , Figure 8 and Figure 9 As shown, the clutch mechanism 40 further includes a clutch assembly 404, which is configured with a plurality of clutch steel balls. The first clutch disc 401 is provided with a plurality of first grooves 4011, and the second clutch disc 402 is provided with a plurality of protrusions 4021. The clutch steel balls are partially accommodated in the first grooves 4011. The first clutch disc 401 can interruptibly transmit torque to the second clutch disc 402 through the clutch steel balls and the protrusions 4021.

[0196] Optionally, a plurality of protrusions 4021 may be provided on the first clutch disc 401, and a plurality of first grooves 4011 may be provided on the second clutch disc 402, with the clutch steel ball partially accommodated in the first groove 4011; the first clutch disc 401 may transmit torque to the second clutch disc 402 intermittently through the protrusions 4021 and the clutch steel ball.

[0197] It should be noted that the above-mentioned preset distance range is calculated and determined based on the height (h) of the protrusion 4021 and the diameter (d) of the clutch steel ball. The preset distance range is [h, h+d). When the axial displacement of the second clutch disc 402 is within the preset distance range, the power tool will never engage the clutch.

[0198] In one possible implementation, such as Figure 10 , Figures 11-14 As shown, the locking mechanism 60 and the limiting mechanism 70 can be configured as: a torque adjusting tool C; the torque adjusting tool C can pass through the first through hole 101 and / or the second through hole 102 provided on the housing 10 from the outside of the power tool housing 10; the torque adjusting tool C is used to engage with the second groove 504 provided on the torque adjusting mechanism 50 to limit the radial rotation of the torque adjusting mechanism 50 and / or abut against the first clutch disc 401 to limit the axial movement of the first clutch disc 401;

[0199] The housing 10 is also provided with a cover plate 104, and a switch 103 is connected to the cover plate 104. The switch 103 can be used with the torque adjustment tool C to control the cover plate 104 to open or close the first through hole 101 and the second through hole 102.

[0200] It should be noted that the through holes provided on the housing 10 can be located directly above the housing 10 or on both sides of the housing 10.

[0201] Optionally, switch 103 can be configured as a cover screw, which controls the opening or closing of the first through hole 101 and the second through hole 102 by rotating the cover screw with torque adjusting tool C.

[0202] like Figure 13 As shown, when the torque adjustment tool C passes through the first through hole 101 and the second through hole 102, one end of the torque adjustment tool C engages with the second groove 504, and the other end of the torque adjustment tool C abuts against the second clutch disc 402. At this time, the torque adjustment mechanism 50 cannot rotate with the output shaft 20. When the output torque of the power tool reaches the set torque, the second clutch disc 402 cannot move axially, so the power tool cannot engage or disengage.

[0203] Optionally, when the power tool is in the locked state, the motor 301 is started. As the motor 301 drives the output shaft 20 to rotate, the torque adjustment mechanism 50 is displaced axially through the threaded engagement, thereby changing the bias force of the elastic element 403. When the bias force corresponding to the set torque is reached, the motor 301 stops.

[0204] Optionally, the torque adjusting gear 502 is provided with a shape that meshes with one end of the torque adjusting tool C, similar to the shape fit between a screw and a screwdriver. When one end of the torque adjusting tool C meshes with the torque adjusting gear 502, the torque adjusting gear 502 can be rotated radially by manually rotating the torque adjusting tool C. Since the torque adjusting gear 502 is engaged with the adjusting nut 501, the radial rotation of the torque adjusting gear 502 drives the adjusting nut 501 to rotate radially, causing the torque adjusting mechanism 50 to undergo axial displacement, thereby realizing torque adjustment.

[0205] For example, when the power tool needs to adjust the torque, first align the second groove 504 with the first through hole 101, then insert the end of the torque adjustment tool C with the screwdriver function into the first through hole 101 and engage with the screw shape set on the torque adjustment gear plate 502. By manually rotating the torque adjustment tool C, the torque adjustment mechanism 50 is axially displaced, thereby achieving the effect of torque adjustment.

[0206] It should be noted that the torque of the power tool can be manually adjusted directly using the torque adjustment tool C, or the above-mentioned technical solution of adjusting the torque by starting the motor can be used first, and then the torque adjustment tool C can be used for manual fine-tuning to make the torque adjustment of the power tool more accurate.

[0207] like Figure 14 As shown, when the power tool is in the unlocked state, the torque adjustment mechanism 50 can rotate with the output shaft 20. When the output torque of the power tool reaches the set torque, the second clutch disc 402 can move axially to achieve clutch engagement.

[0208] In one possible implementation, before adjusting the torque using the torque adjustment tool C, it is necessary to align the second groove 504 with the first through hole 101 via a calibration mechanism, such as... Figure 4 and Figure 10 As shown:

[0209] The calibration mechanism includes a magnetic component 801 and a magnetic induction component 802. The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the magnetic induction component 802 is fixed on the housing 10 and electrically connected to the controller. The torque adjustment mechanism 50 is provided with a second groove 504. When the magnetic component 801 is sensed by the magnetic induction component 802, the locking mechanism 60 can engage with the second groove 504.

[0210] Optionally, multiple grooves are provided on the torque adjustment mechanism 50 and matched with corresponding magnetic components. When the magnetic component is sensed by the magnetic induction component, the locking mechanism 60 can engage with one of the multiple grooves.

[0211] It should be noted that the calibration mechanism may not share the magnetic component 801 and the magnetic induction component 802 with the torque detection mechanism 80. The magnetic component and the magnetic induction component can be set separately. As long as the magnetic component is sensed by the magnetic induction component, the locking mechanism 60 can engage with the second groove 504.

[0212] In another possible implementation, the torque adjustment mechanism 50 is provided with multiple grooves (not shown in the figure), and a switchable window is provided on the housing 10. The positions of the multiple grooves can be observed through the window. When the motor is started, the operator can observe the position of the grooves through the window and manually control the rotation of the motor so that one of the grooves is in the relative position of the locking mechanism 60. At this time, the locking mechanism 60 can engage with the second groove 504.

[0213] Optionally, the starter motor 301 drives the output shaft 20 to rotate, thereby driving the torque adjustment mechanism 50 to rotate. When the magnetic component 801 is sensed by the magnetic induction component 802, the motor 301 is controlled to stop. At this time, the second groove 504 corresponds to the first through hole 101, and the torque adjustment tool C can pass through the first through hole 101 and engage with the second groove 504.

[0214] Specifically, when the torque adjustment mechanism 50 is not locked, it can rotate with the output shaft, which is driven by a motor. At this time, the magnetic component 801 on the torque adjustment mechanism 50 rotates circumferentially with the motor. When the magnetic component 801 is sensed by the magnetic induction component 802, a Hall signal is generated. When the controller of the power tool receives this Hall signal, it sends a braking command to the motor, controlling it to stop rotating in time, so that the second groove 504 stops at the position corresponding to the first through hole 101. At this point, the torque adjustment tool C can be manually engaged with the second groove 504.

[0215] In one possible implementation, the torque detection mechanism 80 includes a magnetic component 801 and a magnetic induction component 802. The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the magnetic induction component 802 is fixed on the housing 10 and electrically connected to the controller. When the torque adjustment mechanism 50 is locked, the magnetic component 801 can be sensed by the magnetic induction component 802 to detect the axial displacement of the torque adjustment mechanism 50. The axial displacement of the torque adjustment mechanism 50 is equal to the compression change of the elastic element 403, so the torque value of the power tool can be calculated based on the axial displacement.

[0216] The power tool also includes a clutch detection mechanism 90, which includes a magnetic component 901 fixed to the housing 10 and axially movable, and a magnetic induction component 902 disposed on the housing 10. When the power tool reaches a set torque and engages, the second clutch disc 402 drives the magnetic component 901 to move axially, so that the magnetic component 901 can be sensed by the magnetic induction component 902. When the magnetic component 901 is sensed by the magnetic induction component 902, a clutch signal is generated. When the controller receives the clutch signal, it determines that the power tool has engaged and executes a stop operation or other preset operation commands.

[0217] In another possible implementation, such as Figure 5As shown, the torque detection mechanism 80 can be configured as a magnetic component 801 and multiple magnetic induction components (magnetic induction component 802 and magnetic induction component 803). The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the magnetic induction component 802 is fixed on the housing 10 and electrically connected to the controller. When the torque adjustment mechanism 50 is locked, the magnetic component 801 can be sensed by the magnetic induction component 802 (first magnetic induction component) and the magnetic induction component 803 (second magnetic induction component) to detect the axial displacement of the torque adjustment mechanism 50. The axial displacement of the torque adjustment mechanism 50 is equal to the compression change of the elastic element 403, so the torque value of the power tool can be calculated based on the axial displacement. By setting multiple magnetic induction components 802, the axial displacement of the torque adjustment mechanism 50 can be detected more accurately, and the detectable displacement range is also larger, improving the accuracy of tool torque adjustment and the torque adjustable range.

[0218] It should be noted that the magnetic induction ranges of magnetic induction components 802 and 803 at least partially overlap each other and cover the movable range of the torque adjustment mechanism 50.

[0219] In another possible implementation (not shown in the figures), the torque detection mechanism 80 includes: a magnetic component 801 and three magnetic induction components (i.e., a first magnetic induction component, a second magnetic induction component, and a third magnetic induction component) arranged sequentially in the axial direction. The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the three magnetic induction components are fixed on the housing 10 and electrically connected to the controller. When the locking mechanism 60 locks the torque adjustment mechanism 50, the magnetic component 801 can be sensed by the three magnetic induction components to detect the axial displacement of the torque adjustment mechanism 50. The axial displacement of the torque adjustment mechanism 50 is equal to the compression change of the elastic element 403, so the torque value of the power tool can be calculated based on the axial displacement.

[0220] It should be noted that the first magnetic induction component has a first sensing range, the second magnetic induction component has a second sensing range, and the third magnetic induction component has a third sensing range; the first sensing range, the second sensing range, and the third sensing range at least partially overlap and cover the movable range of the torque adjustment mechanism 50.

[0221] In another possible implementation, such as Figure 6 As shown, the torque detection mechanism 80 can be configured as a pressure sensor 804, a plane bearing 805, and a gasket 806. The pressure sensor 804 is electrically connected to the controller and is located between the torque adjustment mechanism 50 and the elastic element 403. It is used to detect the bias force of the elastic element 403 on the torque adjustment mechanism 50. The controller then calculates the torque value of the power tool based on the detected pressure value.

[0222] Optionally, the pressure sensor 804 can also be located between the first clutch disc 401 and the elastic element 403 to detect the bias force of the elastic element 403 on the first clutch disc 401. The controller then calculates the torque value of the power tool based on the detected pressure value.

[0223] In one possible implementation, the power tool is also provided with an operating interface, which can be located on the rear shell of the housing 10 or on the base of the housing 10. The operating interface is used to input commands to control the power tool to enter the torque adjustment mode. When the power tool enters the torque adjustment mode, the light unit on the power tool flashes or the sound control unit beeps to remind the user, making it easier for the user to operate and improving the user experience.

[0224] In one possible implementation, the power tool further includes: a controller located inside the housing 10 and electrically connected to the motor 301, the controller having a storage unit for storing the correspondence between the compression amount of the elastic element 403 and the torque value, for calculating the torque value when adjusting the torque.

[0225] In another possible implementation, a first locking button (locking mechanism 60) is provided at the first through hole 101, and a second locking button (limiting mechanism 70) is provided at the second through hole 102; the first locking button is partially disposed outside the housing 10 through the first through hole 101, and the second locking button is partially disposed outside the housing 10 through the second through hole 102; the first locking button can engage with the second groove 504 provided on the torque adjusting mechanism 50 to limit the radial rotation of the torque adjusting mechanism 50, and the second locking button can abut against the first clutch disc 401 to limit the axial movement of the second clutch disc 402.

[0226] For example, the second locking button can be locked separately to prevent the power tool from engaging or disengaging during operation, thereby increasing the applicable scenarios for the power tool.

[0227] The locking mechanism 60 further includes a first spring, and the limiting mechanism 70 further includes a second spring; the first spring portion passes through the first through hole 101 and surrounds the first locking button in the radial direction, for realizing the automatic rebound of the first locking button; the second spring portion passes through the second through hole 102 and surrounds the second locking button in the radial direction, for realizing the automatic rebound of the second locking button.

[0228] Example 4:

[0229] In one possible implementation, such as Figure 1 As shown, the power tool includes:

[0230] The housing 10 contains an output shaft 20, a drive mechanism 30, a clutch mechanism 40, a torque adjustment mechanism 50, a torque detection mechanism 80, a clutch detection mechanism 90, and a calibration mechanism.

[0231] The output shaft 20 is provided with a first thread 201. The drive mechanism 30 includes a motor 301. The clutch mechanism 40 includes a first clutch disc 401, a second clutch disc 402, and an elastic element 403. The torque adjustment mechanism 50 includes an adjusting nut 501 and a torque adjustment gear disc 502. The adjusting nut 501 is also provided with a second thread 503. The torque detection mechanism 80 includes a magnetic component 801 and a magnetic induction component 802. The calibration mechanism includes a magnetic component 801 and a magnetic induction component 802.

[0232] Specifically, the motor 301 drives the first clutch disc 401 to rotate, and the first clutch disc 401 can intermittently transmit torque to the second clutch disc 402. The elastic element 403 is arranged around the output shaft 20. One end of the elastic element 403 biases the second clutch disc 402, and the other end of the elastic element 403 biases the torque adjustment mechanism 50. The torque adjustment mechanism 50 has a second thread 503. By cooperating with the first thread 201, the biasing force of the elastic element 403 on the second clutch disc 402 can be adjusted to realize the torque adjustment of the power tool. The locking mechanism 60 is used to selectively lock the torque adjustment mechanism 50 so that the torque adjustment mechanism 50 does not follow the rotation of the output shaft 20 and / or the motor 301. The limiting mechanism 70 is used to limit the second clutch disc 402 so that the axial displacement of the second clutch disc 402 is within a preset distance range. This realizes the automatic adjustment of the power tool torque and improves the accuracy and adjustable range of torque adjustment.

[0233] In one possible implementation, such as Figure 1 , Figure 8 and Figure 9 As shown, the clutch mechanism 40 further includes a clutch assembly 404, which is configured with a plurality of clutch steel balls. The first clutch disc 401 is provided with a plurality of first grooves 4011, and the second clutch disc 402 is provided with a plurality of protrusions 4021. The clutch steel balls are partially accommodated in the first grooves 4011. The first clutch disc 401 can interruptibly transmit torque to the second clutch disc 402 through the clutch steel balls and the protrusions 4021.

[0234] Optionally, a plurality of protrusions 4021 may be provided on the first clutch disc 401, and a plurality of first grooves 4011 may be provided on the second clutch disc 402, with the clutch steel ball partially accommodated in the first groove 4011; the first clutch disc 401 may transmit torque to the second clutch disc 402 intermittently through the protrusions 4021 and the clutch steel ball.

[0235] It should be noted that the above-mentioned preset distance range is calculated and determined based on the height (h) of the protrusion 4021 and the diameter (d) of the clutch steel ball. The preset distance range is [h, h+d). When the axial displacement of the second clutch disc 402 is within the preset distance range, the power tool will never engage the clutch.

[0236] In one possible implementation, such as Figure 10 , Figure 15 , Figure 16 and Figure 17 As shown, the locking mechanism 60 and the limiting mechanism 70 can be configured as: a locking button D and a spring d; the locking button D is partially disposed outside the housing 10 through a through hole E provided on the housing 10; the locking button D has a first end (locking mechanism 60) and a second end (limiting mechanism 70), the first end can engage with the second groove 504 provided on the torque adjusting mechanism 50 to limit the radial rotation of the torque adjusting mechanism 50, the second end can abut against one end of the retainer 903, and the other end of the retainer 903 abuts against the second clutch disc 402, thereby achieving the effect of limiting the axial movement of the second clutch disc 402;

[0237] The spring d portion passes through the through hole E and radially surrounds the locking button D to achieve automatic rebound of the locking button D.

[0238] like Figure 16 As shown, when the locking button D is in the unlocked state, the spring d is in the uncompressed state, and the torque adjustment mechanism 50 can rotate with the output shaft 20. When the output torque of the power tool reaches the set torque, the second clutch disc 402 can move axially to achieve clutch engagement.

[0239] It should be noted that when the power tool is engaged and the locking button D is in the unlocked state, the axial displacement of the second clutch disc 402 will push the retainer 903 to compress the spring 904 to produce axial movement. When the clutch is disengaged, the spring 904 can reset the retainer 903.

[0240] like Figure 17 As shown, when the locking button D is in the locked state, the spring d is in the compressed state. The first end of the locking button D engages with the second groove 504, the second end abuts against one end of the retainer 903, and the other end of the retainer 903 abuts against the second clutch disc 402. At this time, the torque adjustment mechanism 50 cannot rotate with the output shaft 20. When the output torque of the power tool reaches the set torque, the second clutch disc 402 cannot move axially, so the power tool cannot engage or disengage.

[0241] When the locking button D is in the locked state, the motor 301 is started. As the motor 301 drives the output shaft 20 to rotate, the torque adjustment mechanism 50 is displaced axially through the threaded engagement, thereby changing the bias force of the elastic element 403. When the bias force corresponding to the set torque is reached, the motor 301 stops.

[0242] In one possible implementation, before the locking button D enters the locked state, a calibration mechanism is needed to align the second groove 504 with the first end of the locking button D, such as... Figure 4 and Figure 10 As shown:

[0243] The calibration mechanism includes a magnetic component 801 and a magnetic induction component 802. The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the magnetic induction component 802 is fixed on the housing 10 and electrically connected to the controller. The torque adjustment mechanism 50 is provided with a second groove 504. When the magnetic component 801 is sensed by the magnetic induction component 802, the locking mechanism 60 can engage with the second groove 504.

[0244] Optionally, multiple grooves are provided on the torque adjustment mechanism 50 and matched with corresponding magnetic components. When the magnetic component is sensed by the magnetic induction component, the locking mechanism 60 can engage with one of the multiple grooves.

[0245] It should be noted that the calibration mechanism may not share the magnetic component 801 and the magnetic induction component 802 with the torque detection mechanism 80. The magnetic component and the magnetic induction component can be set separately. As long as the magnetic component is sensed by the magnetic induction component, the locking mechanism 60 can engage with the second groove 504.

[0246] In another possible implementation, the torque adjustment mechanism 50 is provided with multiple grooves (not shown in the figure), and a switchable window is provided on the housing 10. The positions of the multiple grooves can be observed through the window. When the motor is started, the operator can observe the position of the grooves through the window and manually control the rotation of the motor so that one of the grooves is in the relative position of the locking mechanism 60. At this time, the locking mechanism 60 can engage with the second groove 504.

[0247] Optionally, the starter motor 301 drives the output shaft 20 to rotate, thereby driving the torque adjustment mechanism 50 to rotate. When the magnetic component 801 is sensed by the magnetic induction component 802, the motor 301 is controlled to stop. At this time, the second groove 504 corresponds to the first end of the locking button D, and the locking button D can be pressed.

[0248] Specifically, when the torque adjustment mechanism 50 is not locked, it can rotate with the output shaft, which is driven by the motor. At this time, the magnetic component 801 on the torque adjustment mechanism 50 rotates circumferentially with the motor. When the magnetic component 801 is sensed by the magnetic induction component 802, a Hall signal is generated. When the power tool controller receives this Hall signal, it sends a brake command to the motor, controlling it to stop rotating in time, so that the second groove 504 stops at the position corresponding to the first end of the locking button D. At this point, the locking button D can be manually or automatically engaged with the second groove 504.

[0249] Optionally, a baffle is provided on the housing 10, which is located directly above the torque adjustment mechanism 50. When calibration is required, the baffle is opened and the motor 301 is started. When the second groove 504 is seen to be directly below the locking button D, the motor 301 is stopped and the locking button D can be pressed.

[0250] In one possible implementation, the power tool further includes a locking state detection mechanism (not shown in the figures), which includes a magnetic component and a magnetic induction component. The magnetic component is disposed on the locking button D, and the magnetic induction component is disposed on the housing of the power tool. The locking state detection mechanism is used to detect and identify whether the locking button D is in a locked state.

[0251] In one possible implementation, the torque detection mechanism 80 includes a magnetic component 801 and a magnetic induction component 802. The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the magnetic induction component 802 is fixed on the housing 10 and electrically connected to the controller. When the torque adjustment mechanism 50 is locked, the magnetic component 801 can be sensed by the magnetic induction component 802 to detect the axial displacement of the torque adjustment mechanism 50. The axial displacement of the torque adjustment mechanism 50 is equal to the compression change of the elastic element 403, so the torque value of the power tool can be calculated based on the axial displacement.

[0252] The power tool also includes a clutch detection mechanism 90, which includes a magnetic component 901 fixed to the housing 10 and axially movable, and a magnetic induction component 902 disposed on the housing 10. When the power tool reaches a set torque and engages, the second clutch disc 402 drives the magnetic component 901 to move axially, so that the magnetic component 901 can be sensed by the magnetic induction component 902. When the magnetic component 901 is sensed by the magnetic induction component 902, a clutch signal is generated. When the controller receives the clutch signal, it determines that the power tool has engaged and executes a stop operation or other preset operation commands.

[0253] In another possible implementation, such as Figure 5As shown, the torque detection mechanism 80 can be configured as a magnetic component 801 and multiple magnetic induction components (magnetic induction component 802 and magnetic induction component 803). The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the magnetic induction component 802 is fixed on the housing 10 and electrically connected to the controller. When the torque adjustment mechanism 50 is locked, the magnetic component 801 can be sensed by the magnetic induction component 802 (first magnetic induction component) and the magnetic induction component 803 (second magnetic induction component) to detect the axial displacement of the torque adjustment mechanism 50. The axial displacement of the torque adjustment mechanism 50 is equal to the compression change of the elastic element 403, so the torque value of the power tool can be calculated based on the axial displacement. By setting multiple magnetic induction components (magnetic induction component 802 and magnetic induction component 803), the axial displacement of the torque adjustment mechanism 50 can be detected more accurately, and the detectable displacement range is also larger, improving the accuracy of tool torque adjustment and the torque adjustable range.

[0254] It should be noted that the magnetic induction ranges of magnetic induction components 802 and 803 at least partially overlap each other and cover the movable range of the torque adjustment mechanism 50.

[0255] In another possible implementation (not shown in the figures), the torque detection mechanism 80 includes: a magnetic component 801 and three magnetic induction components (i.e., a first magnetic induction component, a second magnetic induction component, and a third magnetic induction component) arranged sequentially in the axial direction. The magnetic component 801 is fixed on the torque adjustment mechanism 50, and the three magnetic induction components are fixed on the housing 10 and electrically connected to the controller. When the locking mechanism 60 locks the torque adjustment mechanism 50, the magnetic component 801 can be sensed by the three magnetic induction components to detect the axial displacement of the torque adjustment mechanism 50. The axial displacement of the torque adjustment mechanism 50 is equal to the compression change of the elastic element 403, so the torque value of the power tool can be calculated based on the axial displacement.

[0256] It should be noted that the first magnetic induction component has a first sensing range, the second magnetic induction component has a second sensing range, and the third magnetic induction component has a third sensing range; the first sensing range, the second sensing range, and the third sensing range at least partially overlap and cover the movable range of the torque adjustment mechanism 50.

[0257] In another possible implementation, such as Figure 6 As shown, the torque detection mechanism 80 can be configured as a pressure sensor 804, a plane bearing 805, and a gasket 806. The pressure sensor 804 is electrically connected to the controller and is located between the torque adjustment mechanism 50 and the elastic element 403. It is used to detect the bias force of the elastic element 403 on the torque adjustment mechanism 50. The controller then calculates the torque value of the power tool based on the detected pressure value.

[0258] Optionally, the pressure sensor 804 can also be located between the first clutch disc 401 and the elastic element 403 to detect the bias force of the elastic element 403 on the first clutch disc 401. The controller then calculates the torque value of the power tool based on the detected pressure value.

[0259] In one possible implementation, the power tool is also provided with an operating interface, which can be located on the rear shell of the housing 10 or on the base of the housing 10. The operating interface is used to input commands to control the power tool to enter the torque adjustment mode. When the power tool enters the torque adjustment mode, the light unit on the power tool flashes or the sound control unit beeps to remind the user, making it easier for the user to operate and improving the user experience.

[0260] In one possible implementation, the power tool further includes: a controller located inside the housing 10 and electrically connected to the motor 301, the controller having a storage unit for storing the correspondence between the compression amount of the elastic element 403 and the torque value, for calculating the torque value when adjusting the torque.

[0261] It should be noted that the power tools in Embodiments 1-4 can be DC torque wrenches, AC torque wrenches, or other torque-setting tools.

[0262] For example, such as Figure 18 The DC torque wrench shown includes a housing 10, an output shaft 20, and a battery pack 200. The technical solutions described in Embodiment 1, Embodiment 2, or Embodiment 3 can all be applied to applications such as... Figure 18 The DC constant torque wrench shown.

[0263] Specifically, a DC torque wrench powered by a battery pack 200 may have a battery pack mounting section for mounting the battery pack 200.

[0264] In one possible implementation, the battery pack 200 is detachably mounted to the housing 10 of the DC torque wrench.

[0265] In another possible implementation, the battery pack 200 is fixedly installed in the receiving cavity formed by the housing 10, that is, the battery pack 200 is built into the DC torque wrench.

[0266] For example, such as Figure 19 The AC torque wrench shown includes a housing 10, an output shaft 20, and a power cord 300. The technical solutions described in Embodiment 1, Embodiment 2, or Embodiment 3 can all be applied to applications such as... Figure 19 The AC torque wrench shown is in the hand.

[0267] Specifically, the AC torque wrench operates by connecting to an external AC power source via a power cord 300. The power cord 300 also includes an AC plug. The arrangement of the power cord 300 can be determined based on the location of the motor or the structure and wiring of the AC torque wrench. The AC torque wrench is equipped with an AC power unit for connecting to AC power to supply power to the AC torque wrench.

[0268] In one possible implementation, the AC unit includes an AC plug and peripheral circuitry electrically connected to the AC plug; wherein the AC plug is inserted into an AC socket to access AC mains power, thereby providing a power source for the power tool.

[0269] In another possible implementation, the AC unit includes other structural forms and peripheral circuits capable of accessing AC power, such as an AC plug that is connected to AC power via a portable substation.

[0270] It should be noted that the AC power unit only needs to be able to connect to AC power; the specific structure and form are not restricted here. The AC power that the AC power unit can connect to is in the range of 110V to 130V or 210V to 230V.

[0271] This application provides an embodiment of an electric tool. When adjusting torque, a locking mechanism 60 prevents the torque adjustment mechanism 50 from rotating with the motor 301, and a limiting mechanism 70 prevents the clutch mechanism 40 from engaging during torque adjustment. This avoids the torque being unable to be changed through the threaded engagement between the torque adjustment mechanism 50 and the output shaft 20 when the torque adjustment mechanism 50 is locked and the motor 301 is rotating, thus improving the accuracy of torque adjustment and the adjustable range of torque.

[0272] This application provides a functional block diagram of a control system for a power tool, such as... Figure 20 As shown, the controller is powered by an external power supply. The controller controls the operation of the motor through an internal pre-driver and a three-phase inverter. The controller also includes: a current acquisition module and a current signal conditioning module for detecting the operating current of the power tool; a voltage acquisition module for detecting the voltage of the power tool; and a position signal acquisition module and a position signal conditioning module for detecting the commutation of the motor, thereby obtaining relevant parameters such as motor speed and rate.

[0273] This application provides a circuit diagram of a power tool, such as... Figure 21 As shown, the circuit includes multiple power devices MOSFET 1005, motor 1000, MCU 1001, and acquisition module 1004.

[0274] Optionally, the acquisition module 1004 is used to acquire at least two mechanical parameters or at least two electrical parameters of the motor 1000. The mechanical parameters include speed parameters, sector time parameters or torque parameters, and the electrical parameters include bus current parameters, phase current parameters, bus voltage parameters, power parameters, freewheeling time parameters or duty cycle parameters.

[0275] The acquisition module 1004 transmits the acquired parameters to the MCU 1001 for data analysis and processing, and then controls the operation of the motor according to the preset motor control strategy.

[0276] In some implementations, the speed parameter includes: speed, speed difference, or slope of the speed curve; the sector time parameter includes: sector time, sector time difference, or slope of the sector time curve; the torque parameter includes: torque, torque difference, or slope of the torque curve; the bus current parameter includes: bus current, bus current difference, or slope of the bus current curve; the phase current parameter includes: phase current, phase current difference, or slope of the phase current curve; the bus voltage parameter includes: bus voltage, bus voltage difference, or slope of the bus voltage curve; the power parameter includes: power, power difference, or slope of the power curve; the freewheeling time parameter includes: freewheeling time, freewheeling time difference, or slope of the freewheeling time curve; the duty cycle parameter includes: duty cycle parameter, duty cycle parameter difference, or slope of the duty cycle parameter curve; and the ratios of different mechanical parameters or different electrical parameters are of the same type.

[0277] Another embodiment of this application provides a circuit diagram of a power tool, such as... Figure 22 As shown:

[0278] In one possible implementation, the control circuit includes a power supply module for supplying power to the power tool; a parameter display module for displaying the parameters of the power tool; a calibration detection module for detecting the set torque; a battery pack communication protocol module; a current detection module for detecting the current during operation of the power tool; a torque sensor detection module for detecting the actual output torque value; a strain gauge sensor detection module for detecting the spring compression; and a microcontroller for controlling the motor, power supply module, parameter display module, calibration detection module, battery pack communication protocol module, current detection module, torque sensor detection module, and strain gauge sensor detection module.

[0279] The above combination Figures 1 to 22 The power tools provided in the embodiments of this application are described in detail below. Figures 23-25 This application provides a detailed description of a torque adjustment method for an electric tool, based on an embodiment of the present application.

[0280] Figure 23This application provides an embodiment of a torque adjustment method for an electric tool. This torque adjustment method can be executed by the controller in the electric tool described in embodiments one through four above. Figure 23 As shown, the torque adjustment method includes:

[0281] S2301. After obtaining the mode switching signal, control the power tool to enter the torque adjustment mode.

[0282] In one possible implementation, controlling the power tool to enter torque adjustment mode after acquiring the mode switching signal includes:

[0283] The system identifies commands input from the power tool's interface; if the command matches a preset command, it controls the power tool to enter torque adjustment mode and alerts the user by flashing lights or beeping.

[0284] For example, the user interface can also display parameters such as torque, mode, and speed of the power tool in real time.

[0285] For example, the torque adjustment mode can also be entered by pressing the mode switch button.

[0286] For example, the torque adjustment mode can also be entered by pressing the trigger multiple times.

[0287] S2302, Start the motor of the power tool and obtain a positioning signal.

[0288] In one possible implementation, activating the motor of the power tool and acquiring a positioning signal includes:

[0289] When the torque adjustment mechanism is driven to rotate by the motor, the magnetic component in the calibration mechanism is sensed by the magnetic induction component, generating a positioning signal; after the controller of the power tool obtains the positioning signal, it controls the motor to stop.

[0290] In another possible implementation, a baffle is provided on the housing. When the torque adjustment mode is entered, the baffle is automatically opened or manually opened. After the baffle is opened, the second groove on the torque adjustment mechanism can be observed by the operator. At this time, the operator presses the trigger to start the motor, causing the output shaft to drive the torque adjustment mechanism to rotate. When the second groove on the torque adjustment mechanism is directly below the baffle, the trigger is released to stop the motor. Then, the controller can be prompted that the calibration work has been completed by pressing the trigger multiple times, and the controller receives the positioning signal.

[0291] S2303. If the positioning signal is obtained, control the locking mechanism to lock the torque adjustment mechanism and control the limiting mechanism to restrict the axial displacement of the clutch mechanism.

[0292] In one possible implementation, when the controller receives a positioning signal, it automatically controls the locking button to enter the locking state, and the locking torque adjustment mechanism rotates radially with the motor to limit the axial displacement of the second clutch disc.

[0293] In another possible implementation, when the controller receives a positioning signal, it reminds the operator to adjust the torque mechanism to calibrate the position. At this time, the operator can manually press the locking button to enter the locked state or insert an external torque adjustment tool to enter the locked state.

[0294] Figure 24 Another embodiment of this application provides a torque adjustment method for an electric tool, the torque adjustment method comprising:

[0295] S2401. After obtaining the mode switching signal, control the power tool to enter the torque adjustment mode.

[0296] S2402, Start the motor of the power tool and obtain a positioning signal.

[0297] S2403. If the positioning signal is obtained, control the locking mechanism to lock the torque adjustment mechanism and control the limiting mechanism to restrict the axial displacement of the clutch mechanism.

[0298] It should be noted that steps S2401-S2403 can be referred to steps S2301-S2303, and will not be repeated here.

[0299] S2404. Start the motor and obtain the torque adjustment signal.

[0300] In one possible implementation, starting the motor and acquiring a torque adjustment signal includes:

[0301] When the motor drives the output shaft to rotate, causing the torque adjustment mechanism to produce axial displacement, the magnetic component of the torque detection mechanism can be sensed by the magnetic induction component to generate a torque adjustment signal; then the torque adjustment signal is obtained through the controller.

[0302] In another possible implementation, starting the motor and acquiring the torque adjustment signal includes:

[0303] The torque detection mechanism uses a pressure sensor to detect the bias force of the elastic element on the torque adjustment mechanism, and then calculates the axial displacement of the torque adjustment mechanism based on the bias force to obtain the torque adjustment signal.

[0304] The torque adjustment signal includes the axial displacement distance or pressure value of the torque adjustment mechanism.

[0305] S2405. Determine the torque of the power tool based on the torque adjustment signal.

[0306] In one possible implementation, if the torque detection mechanism of the power tool uses a Hall sensor (i.e., a magnetic component and a magnetic induction component), determining the torque of the power tool based on the torque adjustment signal includes:

[0307] The axial displacement of the torque adjustment mechanism is determined based on the torque adjustment signal; the compression of the elastic element is determined based on the axial displacement of the torque adjustment mechanism; and the torque of the power tool is determined by consulting a preset torque-compression relationship table based on the compression of the elastic element.

[0308] In another possible implementation, if the torque detection mechanism of the power tool uses a pressure sensor, determining the torque of the power tool based on the torque adjustment signal includes:

[0309] The compression of the elastic element is determined based on the torque adjustment signal; the torque of the power tool is determined by referring to the preset torque-compression relationship table based on the compression of the elastic element.

[0310] For example, the torque-compression relationship of power tools in their factory condition is shown in Table 1 below:

[0311] Table 1

[0312]

[0313] For example, such as Figure 25 As shown, the torque value can be calculated using the following formula:

[0314] T = k(x + h)tanθ × r;

[0315] In the formula, T is the output torque of the power tool, k is the spring stiffness, h is the clutch height, x is the spring compression, r is the radius of rotation of the clutch ball, and θ is the angle between the clutch ramp and the plane containing the clutch disc.

[0316] In one possible implementation, the torque adjustment method for the power tool further includes:

[0317] Determine if the torque of the power tool is close to the user's set torque value; if close, release the locking mechanism and the limiting mechanism; if not close, check if the locking mechanism is locked and the limiting mechanism is limited; if the locking mechanism is locked and the limiting mechanism is limited, restart the motor to adjust the torque of the power tool.

[0318] In one possible implementation, the torque adjustment method for the power tool further includes locking state detection, specifically including:

[0319] Start the motor and acquire the current in real time; if the current is greater than or equal to the preset current threshold within a preset time, determine that the locking mechanism is in the locked state and / or the limit mechanism is in the limit state; control the power tool to alarm and remind the user.

[0320] Optionally, the status of the locking mechanism and the limit mechanism can also be detected by a locking status detection mechanism installed in the power tool, specifically including:

[0321] When the magnetic induction component of the locking state detection mechanism senses the magnetic components on the locking mechanism and / or the limit mechanism, it determines that the locking mechanism is in a locked state and / or the limit mechanism is in a limit state; and controls the power tool to alarm and remind the user.

[0322] The detection by the aforementioned current detection or lockout detection mechanism can effectively prevent mechanical overload caused by starting the motor in the locked state, avoid damage to power tools, and effectively protect the operator's safety.

[0323] It should be noted that, in addition to detecting the current threshold of the power tool, the state of the locking mechanism and the limit mechanism can also be determined by detecting changes in the current. If the rate of change of the current is greater than the threshold, it can be determined that the locking mechanism is in the locked state and / or the limit mechanism is in the limit state, as detailed below:

[0324] For example, the rate of change of current can also be calculated using the following algorithm:

[0325] Based on the collected current, the first derivative of the current is obtained using a linear regression algorithm.

[0326] In one specific implementation, linear regression analysis can be used to calculate the slope. In a scatter plot, the best-fit line for the scatter data is defined by the equation y = a + bx, where the slope of the best-fit line can be determined as b = (∑xy - (∑x∑y) / n) / (∑xy). 2 -(∑x) 2 / n, where n is the number of data points, y is the current value, and the intercept is negligible; based on the above formula, b is obtained, such that Thus, the first derivative can be calculated, which is the rate of change of the current.

[0327] For example, the rate of change of current can also be calculated using the following algorithm:

[0328] The rate of change of current is calculated using the method of successive differences; specifically, the first derivative of the parameter with respect to time. Where t n and t n-1 For two adjacent time points of the collected parameters, i n and i n-1 They are respectively at t n and tn-1 The parameters collected at that time.

[0329] It should be noted that in some embodiments, the change in current can also be determined by the second derivative of the current.

[0330] This application provides a torque adjustment method for an electric tool. The method includes: controlling the electric tool to enter a torque adjustment mode after acquiring a mode switching signal; starting the electric tool's motor and acquiring a positioning signal; if the positioning signal is acquired, controlling a locking mechanism to lock the torque adjustment mechanism and controlling a limit mechanism to restrict the axial displacement of the clutch mechanism; starting the motor and acquiring a torque adjustment signal; and determining the torque of the electric tool based on the torque adjustment signal. This application embodiment can achieve automatic torque adjustment, improve the accuracy of torque adjustment, facilitate operation, and enhance the operator's user experience.

[0331] The above combination Figures 1 to 22 The power tools provided in the embodiments of this application are described in detail below. Figure 26 This application provides a detailed description of another embodiment of a torque adjustment method for an electric tool.

[0332] Figure 26 This application provides another embodiment of a torque adjustment method for an electric tool, which can be executed by the controller in the electric tools described in embodiments one to four above. Figure 26 As shown, the torque adjustment method includes:

[0333] S2601. When the locking mechanism locks the torque adjustment mechanism and the limiting mechanism to restrict the axial displacement of the clutch mechanism, the motor of the power tool is started to rotate in the first direction and a torque adjustment signal is obtained.

[0334] S2602. Determine the first torque of the power tool based on the torque adjustment signal;

[0335] S2603. Determine whether the first torque of the power tool is close to the torque value set by the user;

[0336] S2604. If they are not close, start the motor in the second direction to adjust the torque of the power tool to the second torque.

[0337] S2605. Start the motor again in the first direction so that the torque of the power tool is close to the set torque value;

[0338] Wherein, the first direction is opposite to the second direction.

[0339] It should be noted that steps S2604-S2605 can be repeated until the torque of the power tool is close to the set torque value.

[0340] In one possible implementation, if the first torque of the power tool is close to the set torque value, the locking state of the locking mechanism and the limiting state of the limiting mechanism are released, at which point the torque adjustment of the power tool is completed.

[0341] In one possible implementation, prior to step S2604, the method further includes:

[0342] The system detects whether the locking mechanism is in the locked state and whether the limit mechanism is in the limit state. If the locking mechanism is in the locked state and the limit mechanism is in the limit state, the motor is started in the second direction to adjust the torque of the power tool to the second torque. If the locking mechanism is not in the locked state and the limit mechanism is not in the limit state, the locking mechanism is adjusted to the locked state and the limit mechanism is adjusted to the limit state.

[0343] It should be noted that if the power tool is adjusted from low torque to high torque, the setting torque value > first torque value > second torque value, or first torque value > setting torque value > second torque value, or second torque value > setting torque value > first torque value, or second torque value > first torque value > setting torque value.

[0344] If the power tool is adjusted from high torque to low torque, then the set torque value < first torque value < second torque value, or the first torque value < set torque value < second torque value, or the second torque value < first torque value < set torque value, or the second torque value < set torque value < first torque value.

[0345] For example, if the current torque value of the power tool is 18 Nm, and the user needs to adjust the torque value of the power tool to 12 Nm (i.e., set the torque value), when the locking mechanism locks the torque adjustment mechanism and the limit mechanism to restrict the axial displacement of the clutch mechanism, the motor is then started to rotate in the first direction to adjust the torque value of the power tool to 12.8 Nm (i.e., the first torque). At this time, the torque adjustment error is 0.8 Nm, which is greater than the set error range of 12 x 5% = 0.6 Nm. The power tool is then controlled to start the motor in the second direction to adjust the torque to 15 Nm (i.e., the second torque), and then the motor is started again in the first direction to adjust the torque to 12.2 Nm. Within the allowable error range, the torque adjustment ends.

[0346] For example, if the current torque value of the power tool is 18 Nm, and the user needs to adjust the torque value of the power tool to 12 Nm (i.e., set the torque value), when the locking mechanism locks the torque adjustment mechanism and the limit mechanism to restrict the axial displacement of the clutch mechanism, the motor is then started to rotate in the first direction to adjust the torque value of the power tool to 11.2 Nm (i.e., the first torque). At this time, the torque adjustment error is 0.8 Nm, which is greater than the set error range of 12 x 3% = 0.36 Nm. The power tool is then controlled to start the motor in the second direction to adjust the torque to 15 Nm (i.e., the second torque), and then the motor is started again in the first direction to adjust the torque to 12.2 Nm. Within the allowable error range, the torque adjustment ends.

[0347] For example, if the current torque value of the power tool is 12 Nm, and the user needs to adjust the torque value of the power tool to 18 Nm (i.e., set the torque value), when the locking mechanism locks the torque adjustment mechanism and the limit mechanism to restrict the axial displacement of the clutch mechanism, the motor is then started to rotate in the second direction to adjust the torque value of the power tool to 17.2 Nm (i.e., the first torque). At this time, the torque adjustment error is 0.8 Nm, which is greater than the set error range of 18 x 3% = 0.54 Nm. The power tool is then controlled to start the motor in the first direction to adjust the torque to 15 Nm (i.e., the second torque), and then the motor is started again in the second direction to adjust the torque to 18.2 Nm. Within the allowable error range, the torque adjustment ends.

[0348] For example, if the current torque value of the power tool is 12 Nm, and the user needs to adjust the torque value of the power tool to 18 Nm (i.e., set the torque value), when the locking mechanism locks the torque adjustment mechanism and the limit mechanism to restrict the axial displacement of the clutch mechanism, the motor is then started to rotate in the second direction to adjust the torque value of the power tool to 18.8 Nm (i.e., the first torque). At this time, the torque adjustment error is 0.8 Nm, which is greater than the set error range of 18 x 3% = 0.54 Nm. The power tool is then controlled to start the motor in the first direction to adjust the torque to 15 Nm (i.e., the second torque), and then the motor is started again in the second direction to adjust the torque to 18.2 Nm. Within the allowable error range, the torque adjustment ends.

[0349] In another possible embodiment, the method further includes the following after step S2603:

[0350] If they are not close, continue to start the motor in the first direction to adjust the torque of the power tool to the second torque;

[0351] Then, the motor is started in the second direction so that the torque of the power tool is close to the set torque value;

[0352] Wherein, the first direction is opposite to the second direction.

[0353] For example, if the current torque value of the power tool is 18 Nm, and the user needs to adjust the torque value of the power tool to 12 Nm (i.e., set the torque value), when the locking mechanism locks the torque adjustment mechanism and the limit mechanism to restrict the axial displacement of the clutch mechanism, the motor is then started to rotate in the first direction to adjust the torque value of the power tool to 12.8 Nm (i.e., the first torque). At this time, the torque adjustment error is 0.8 Nm, which is greater than the set error range of 12 x 5% = 0.6 Nm. The power tool is then controlled to continue starting the motor in the first direction to adjust the torque to 9 (i.e., the second torque), and then starting the motor in the second direction to adjust the torque to 12.2 Nm. Within the allowable error range, the torque adjustment ends.

[0354] For example, if the current torque value of the power tool is 18 Nm, and the user needs to adjust the torque value of the power tool to 12 Nm (i.e., set the torque value), when the locking mechanism locks the torque adjustment mechanism and the limit mechanism to restrict the axial displacement of the clutch mechanism, the motor is then started to rotate in the first direction to adjust the torque value of the power tool to 11.2 Nm (i.e., the first torque). At this time, the torque adjustment error is 0.8 Nm, which is greater than the set error range of 12 x 3% = 0.36 Nm. The power tool is then controlled to continue to start the motor in the first direction to adjust the torque to 9 Nm (i.e., the second torque), and then start the motor in the second direction to adjust the torque to 12.2 Nm. Within the allowable error range, the torque adjustment ends.

[0355] For example, if the current torque value of the power tool is 12 Nm, and the user needs to adjust the torque value of the power tool to 18 Nm (i.e., set the torque value), when the locking mechanism locks the torque adjustment mechanism and the limit mechanism to restrict the axial displacement of the clutch mechanism, the motor is then started to rotate in the second direction to adjust the torque value of the power tool to 17.2 Nm (i.e., the first torque). At this time, the torque adjustment error is 0.8 Nm, which is greater than the set error range of 18 x 3% = 0.54 Nm. The power tool is then controlled to continue to start the motor in the second direction to adjust the torque to 20 Nm (i.e., the second torque), and then start the motor in the first direction to adjust the torque to 18.2 Nm. Within the allowable error range, the torque adjustment ends.

[0356] For example, if the current torque value of the power tool is 12 Nm, and the user needs to adjust the torque value of the power tool to 18 Nm (i.e., set the torque value), when the locking mechanism locks the torque adjustment mechanism and the limit mechanism to restrict the axial displacement of the clutch mechanism, the motor is then started to rotate in the second direction to adjust the torque value of the power tool to 18.8 Nm (i.e., the first torque). At this time, the torque adjustment error is 0.8 Nm, which is greater than the set error range of 18 x 3% = 0.54 Nm. The power tool is then controlled to continue to start the motor in the second direction to adjust the torque to 20 Nm (i.e., the second torque), and then start the motor in the first direction to adjust the torque to 18.2 Nm. Within the allowable error range, the torque adjustment ends.

[0357] The above technical solution can overcome the problem of inaccurate torque adjustment or inability to reach the set torque value due to untimely braking caused by insufficient motor control precision. It can achieve high-precision torque adjustment even when using a low-precision motor, saving costs and improving the accuracy of torque adjustment. Furthermore, it can improve the success rate of torque adjustment, avoiding situations where users cannot adjust to the set torque value after multiple adjustments, thus improving the user experience.

[0358] In one possible implementation, obtaining the torque adjustment signal in step S2601 includes:

[0359] When the motor drives the output shaft to rotate, causing the torque adjustment mechanism to produce axial displacement, the magnetic component of the torque detection mechanism can be sensed by the magnetic induction component to generate a torque adjustment signal; then the torque adjustment signal is obtained through the controller.

[0360] Alternatively, the pressure sensor of the torque detection mechanism can be used to detect the bias force of the elastic element on the torque adjustment mechanism, and then the axial displacement of the torque adjustment mechanism can be calculated based on the bias force to obtain the torque adjustment signal.

[0361] The torque adjustment signal includes the axial displacement distance or pressure value of the torque adjustment mechanism.

[0362] In one possible implementation, step S2602 includes:

[0363] If the torque detection mechanism of the power tool uses a Hall sensor (i.e., a magnetic component and a magnetic induction component), then step S2602 includes:

[0364] The axial displacement of the torque adjustment mechanism is determined based on the torque adjustment signal; the compression of the elastic element is determined based on the axial displacement of the torque adjustment mechanism; and the torque of the power tool is determined by consulting a preset torque-compression relationship table based on the compression of the elastic element.

[0365] In another possible implementation, if the torque detection mechanism of the power tool uses a pressure sensor, then step S2602 includes:

[0366] The compression of the elastic element is determined based on the torque adjustment signal; the torque of the power tool is determined by referring to the preset torque-compression relationship table based on the compression of the elastic element.

[0367] For example, the torque-compression relationship of power tools in their factory condition is shown in Table 1 above.

[0368] For example, such as Figure 25 As shown, the torque value can be calculated using the following formula:

[0369] T = k(x + h)tanθ × r;

[0370] In the formula, T is the output torque of the power tool, k is the spring stiffness, h is the clutch height, x is the spring compression, r is the radius of rotation of the clutch ball, and θ is the angle between the clutch ramp and the plane containing the clutch disc.

[0371] In one possible implementation, step S2603 includes:

[0372] Determine whether the absolute value of the difference between the first torque and the set torque value is within a preset value range; if the absolute value of the difference is within the preset value range, then determine that the first torque of the power tool is close to the user's set torque value; wherein, the preset error range can be set as: the absolute value of the difference between the actual output torque value and the set torque value is less than or equal to 5% of the set torque value.

[0373] For example, if the actual output torque value of the tool is within the acceptable range (e.g., ±5%) compared to the set torque value, the torque adjustment can be considered successful; if the error between the actual output torque value and the set torque value is not within the preset error range (e.g., ±10%), the user will be reminded that the torque adjustment has failed.

[0374] It should be noted that the preset value range is determined according to the allowable error range of the torque adjustment of the power tool, such as 3%, 5%, 10%, and 15%.

[0375] This application provides a torque adjustment method for an electric tool. The method includes: when a locking mechanism locks the torque adjustment mechanism and a limiting mechanism restricts the axial displacement of the clutch mechanism, starting the motor of the electric tool to rotate in a first direction and acquiring a torque adjustment signal; determining a first torque of the electric tool based on the torque adjustment signal; determining whether the first torque of the electric tool is close to the user's set torque value; if not close, starting the motor in a second direction to adjust the torque of the electric tool to a second torque; and starting the motor again in the first direction to make the torque of the electric tool close to the set torque value; wherein the first direction and the second direction are opposite. This application overcomes the problem of inaccurate torque adjustment or inability to reach the set torque value due to insufficient motor control precision, improving the accuracy and success rate of torque adjustment, avoiding situations where the user cannot adjust to the set torque value after multiple adjustments, and improving the user experience.

[0376] Figure 27 This application discloses another embodiment of a torque adjustment method for power tools. This torque adjustment method can be used with tools that have automatic or manual torque adjustment functions, other than the power tools described in Embodiments 1 to 4 above. Figure 27 As shown, the torque adjustment method includes:

[0377] S2701. Start the motor of the power tool to rotate in the first direction and adjust the torque of the power tool to the first torque;

[0378] S2702. Determine whether the first torque of the power tool is close to the torque value set by the user;

[0379] S2703. If they are not close, start the motor in the second direction to adjust the torque of the power tool to the second torque.

[0380] S2704. Start the motor again in the first direction so that the torque of the power tool is close to the set torque value;

[0381] Wherein, the first direction is opposite to the second direction.

[0382] The above combination Figures 1 to 22 The power tools provided in the embodiments of this application are described in detail below. Figure 28 This application provides a detailed description of a torque calibration method for power tools.

[0383] Figure 28 This application provides an embodiment of a torque calibration method for an electric tool. This torque calibration method can be executed by the controller in the electric tool described in embodiments one through four above. Figure 28 As shown, the torque calibration method includes:

[0384] S2801. Control the locking mechanism to lock the torque adjustment mechanism and control the limiting mechanism to restrict the clutch mechanism from engaging or disengaging.

[0385] In one possible implementation, the locking mechanism can be automatically controlled by the controller of the power tool to lock the torque adjustment mechanism and the control limit mechanism to restrict the clutch mechanism from engaging or disengaging; alternatively, it can be locked manually. The specific operation will not be described here, but can be referred to the specific descriptions in Embodiments 1-4.

[0386] S2802, Start the motor of the power tool and obtain the torque adjustment signal.

[0387] In one possible implementation, starting the motor of the power tool and obtaining a torque adjustment signal includes:

[0388] When the motor drives the output shaft to rotate, causing the torque adjustment mechanism to produce axial displacement, the magnetic component of the torque detection mechanism can be sensed by the magnetic induction component to generate a torque adjustment signal; then the torque adjustment signal is obtained through the controller.

[0389] In another possible implementation, starting the motor and acquiring the torque adjustment signal includes:

[0390] The torque detection mechanism uses a pressure sensor to detect the bias force of the elastic element on the torque adjustment mechanism, and then calculates the axial displacement of the torque adjustment mechanism based on the bias force to obtain the torque adjustment signal.

[0391] The torque adjustment signal includes the axial displacement distance or pressure value of the torque adjustment mechanism.

[0392] S2803. Adjust the torque of the power tool to the set torque value according to the torque adjustment signal.

[0393] In one possible implementation, adjusting the torque of the power tool to a set torque value according to the torque adjustment signal includes:

[0394] The axial displacement of the torque adjustment mechanism is determined based on the torque adjustment signal; the compression of the elastic element is determined based on the axial displacement of the torque adjustment mechanism; the torque of the power tool is determined by consulting a preset torque-compression relationship table based on the compression of the elastic element; and the motor is controlled to stop when the torque of the power tool reaches the set torque value.

[0395] For example, the torque-compression relationship of power tools in their factory condition is shown in Table 1;

[0396] For example, such as Figure 25 As shown, the torque value can be calculated using the following formula:

[0397] T = k(x + h)tanθ × r;

[0398] In the formula, T is the output torque of the power tool, k is the spring stiffness, h is the clutch height, x is the spring compression, r is the radius of rotation of the clutch ball, and θ is the angle between the clutch ramp and the plane containing the clutch disc.

[0399] S2804. The actual output torque value of the power tool is detected by a torque detection device.

[0400] In one possible implementation, detecting the actual output torque value of the power tool using a torque detection device includes:

[0401] Place the output end of the power tool in the torque detection device and start the power tool to perform multiple torque tests; obtain multiple torque detection values ​​displayed on the torque detection device; calculate the average value of the multiple torque detection values ​​and determine it as the actual output torque value of the power tool.

[0402] It should be noted that the actual output torque value of a power tool can also be determined by algorithms such as taking the median or variance.

[0403] S2805. The actual torque output value is transmitted to the power tool, the transmission including manual transmission and automatic transmission.

[0404] In one possible implementation, transmitting the actual torque output value to the power tool includes:

[0405] The actual torque output value is input into the power tool via the operating interface; or...

[0406] A wired connection is established to establish communication between the power tool and the torque detection device, transmitting the actual torque output value to the power tool for storage.

[0407] In another possible implementation, transmitting the actual torque output value to the power tool includes:

[0408] The power tool receives a connection signal from the torque detection device to establish a wireless communication connection; the torque detection device transmits the actual torque output value to the power tool for storage.

[0409] For example, the wireless communication connection includes: short-range communication or long-range communication;

[0410] Among them, short-range communication includes at least one of the following: Bluetooth communication, WIFI communication, ZigBee communication, Ethernet communication, serial communication, and parallel communication;

[0411] Remote communication includes at least one of the following: GPRS communication, 2G communication, 3G communication, 4G communication, 5G communication, and LTE communication.

[0412] S2806. The controller of the power tool determines whether the power tool has completed torque calibration based on the actual output torque value and the set torque value.

[0413] In one possible implementation, the controller of the power tool determines whether the power tool has completed torque calibration based on the actual output torque value and the set torque value, including:

[0414] The controller compares the actual output torque value with the set torque value of the power tool; if the error between the actual output torque value and the set torque value is within the preset error range, it determines that the actual output torque value is close to the set torque value; if the actual output torque value is close to the set torque value, it determines that the power tool has completed torque calibration.

[0415] If the actual output torque value is not close to the set torque value, the power tool will be controlled to alarm and remind the user that the torque of the power tool needs to be readjusted.

[0416] Optionally, the power tool can use a configured lighting unit and sound control unit to flash lights and sound an alarm to remind the user that the power tool needs to be readjusted for torque.

[0417] The preset error range can be set to a set torque value where the absolute value of the difference between the actual output torque value and the set torque value is less than or equal to 5%.

[0418] In one possible implementation, the torque calibration method for the power tool further includes:

[0419] If there is always an error between the actual output torque value and the set torque value, the preset torque-compression relationship table is updated according to the actual output torque value. The preset torque-compression relationship table is set at the factory and stored in the power tool's memory to calibrate the relationship between the torque value and the compression of the elastic element of the clutch mechanism.

[0420] For example, the preset torque-compression relationship table is shown in Table 1. If there is always an error between the actual output torque value and the set torque value, for example, in the factory state, the compression amount corresponding to 3Nm is 1mm, as shown in Table 1. After a period of use, it is necessary to adjust to 1.2mm of compression amount to 3Nm. After that, the compression force value corresponding to 3Nm in Table 1 will be updated to 1.2mm, and so on, forming new table data and overwriting the original data, as shown in Table 2 below:

[0421] Table 2

[0422]

[0423]

[0424] In one possible implementation, the power tool records the torque value and spring compression for each torque adjustment. When the operator adjusts the torque again, if the input torque value is the same as the one previously input, the controller automatically starts the motor to bring the torque to the set value.

[0425] It should be noted that before step S2804, the method further includes: identifying whether the locking mechanism is in a locked state and whether the limiting mechanism is in a limited state. For details, please refer to the detailed content of identifying whether the locking mechanism is in a locked state and whether the limiting mechanism is in a limited state in Embodiments 1-4. It will not be repeated here.

[0426] Furthermore, the torque calibration method in this application embodiment can also be used in tools with torque adjustment functions other than the power tools described in Embodiments 1 to 4 above.

[0427] This application provides a torque calibration method for power tools. The method includes: controlling a locking mechanism to lock a torque adjustment mechanism and controlling a limit mechanism to restrict the clutch mechanism from engaging; starting the power tool's motor and acquiring a torque adjustment signal; adjusting the power tool's torque to a set torque value based on the torque adjustment signal; detecting the actual output torque value of the power tool using a torque detection device; transmitting the actual torque output value to the power tool, including manual and automatic transmission; and the power tool's controller determining whether torque calibration has been completed based on the actual output torque value and the set torque value. This application can improve the accuracy of torque adjustment, automate and intelligently calibrate torque, avoid multiple ineffective calibrations, and improve the user experience.

[0428] Figure 29 This is a flowchart of a power tool control method according to an embodiment of this application, such as... Figure 29 As shown:

[0429] In one possible implementation, when it is necessary to adjust the torque of the power tool, first enter the settings interface, enter the administrator password and enter the torque adjustment mode. The operator sets the target torque in the settings interface; then press the lock button to lock the clutch (clutch mechanism) and detect the spring compression position to determine whether the spring compression amount meets the target torque. If the spring compression amount meets the target torque, the clutch is unlocked.

[0430] If the target torque is not met, check the clutch lock-up status again. If the clutch is not locked, the tool will alarm to remind the user to lock it. If the clutch is locked, press the switch to adjust the spring compression to the target position and then unlock the clutch.

[0431] Furthermore, it checks whether the clutch is unlocked. If it is not unlocked, the tool will alarm to remind the user. If it is unlocked, it will perform torque calibration, transmit the calibrated data to the tool, and determine whether it meets the target torque. If it meets the target torque, it will exit the torque adjustment mode. If it does not meet the target torque, the tool will alarm to remind the user to reset the torque.

[0432] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0433] In the description of this specification, references to "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0434] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power tool, characterized in that, The power tool includes: A housing, wherein the housing is provided with a through hole; An output shaft, on which a first thread is provided; The drive mechanism includes a motor for outputting power. A clutch mechanism, comprising: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interruptibly transmit torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases against the second clutch disc; A torque adjustment mechanism is biased by the other end of the elastic element. The torque adjustment mechanism has a second thread, and the torque adjustment mechanism adjusts the biasing force of the elastic element on the second clutch disc by the cooperation of the second thread with the first thread. A locking button, which is partially disposed outside the housing through the through hole; The locking button has a first end and a second end. The first end can engage with the second groove provided on the torque adjustment mechanism so that the torque adjustment mechanism does not follow the rotation of the output shaft and / or the motor. The second end can abut against the second clutch disc to limit the axial displacement of the second clutch disc within a preset distance range.

2. The power tool according to claim 1, characterized in that, The locking button is also fitted with a spring, which passes through the through hole and surrounds the locking button in the radial direction to enable the locking button to automatically rebound.

3. The power tool according to claim 1, characterized in that, The clutch mechanism further includes a clutch assembly, which is configured as a plurality of clutch steel balls. The first clutch disc has a plurality of first grooves, and the second clutch disc has a plurality of protrusions. The clutch steel balls are partially accommodated in the first grooves. The first clutch disc transmits torque to the second clutch disc interruptibly through the clutch ball and the protrusion.

4. The power tool according to claim 1, characterized in that, The clutch mechanism further includes a clutch assembly, which is configured as a plurality of clutch steel balls. The first clutch disc has a plurality of protrusions, and the second clutch disc has a plurality of first grooves. The clutch steel balls are partially accommodated in the first grooves. The first clutch disc can interrupt the transmission of torque to the second clutch disc via the protrusion and the clutch ball.

5. The power tool according to claim 3 or 4, characterized in that, The clutch assembly can also be configured as a hemispherical protrusion, which is integrally formed with the first clutch disc or the second clutch disc.

6. The power tool according to claim 5, characterized in that, The preset distance range is determined based on the height of the protrusion and the diameter of the clutch ball, or the height of the protrusion and the diameter of the hemispherical protrusion. When the axial displacement of the second clutch disc is within the preset distance range, the power tool does not engage the clutch.

7. The power tool according to claim 6, characterized in that, The power tool also includes: The calibration mechanism includes a magnetic component and a magnetic induction component. The magnetic component is fixed on the torque adjustment mechanism, and the magnetic induction component is fixed on the housing and electrically connected to the controller of the power tool. The torque adjustment mechanism is provided with a second groove; When the magnetic component is sensed by the magnetic induction component, the first end of the locking button can engage with the second groove to prevent the torque adjustment mechanism from rotating with the output shaft and / or the motor, and the second end of the locking button can abut against the second clutch disc to limit the axial displacement of the second clutch disc within a preset distance range.

8. The power tool according to claim 6, characterized in that, The power tool also includes: A torque detection mechanism, comprising: a magnetic component and a magnetic induction component, wherein the magnetic component is fixedly mounted on the torque adjustment mechanism, and the magnetic induction component is fixedly mounted on the housing and electrically connected to the controller of the power tool; When the locking button locks the torque adjustment mechanism, the magnetic component can be sensed by the magnetic induction component to detect the axial displacement of the torque adjustment mechanism; The displacement is used to determine the torque value of the power tool.

9. The power tool according to claim 6, characterized in that, The power tool also includes: A torque detection mechanism, comprising: a pressure sensor, which is electrically connected to the controller of the power tool and located between the torque adjustment mechanism and the elastic element or between the first clutch disc and the elastic element, for detecting the bias force of the elastic element on the torque adjustment mechanism; The bias force is used to determine the torque value of the power tool.

10. The power tool according to any one of claims 1-9, characterized in that, The power tool may be equipped with a first locking button and a second locking button on the housing, respectively; The first locking button can engage with the second groove provided on the torque adjustment mechanism to restrict the radial rotation of the torque adjustment mechanism, and the second locking button can abut against the first clutch disc to restrict the axial movement of the second clutch disc.

11. A power tool, characterized in that, The power tool is equipped with an external torque adjustment tool, and the power tool includes: A housing, wherein the housing is provided with a first through hole and a second through hole; An output shaft, on which a first thread is provided; The drive mechanism includes a motor for outputting power. A clutch mechanism, comprising: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interruptibly transmit torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases against the second clutch disc; A torque adjustment mechanism is biased by the other end of the elastic element. The torque adjustment mechanism has a second thread, and the torque adjustment mechanism adjusts the biasing force of the elastic element on the second clutch disc by the cooperation of the second thread with the first thread. The torque adjusting tool can pass through the first through hole and / or the second through hole from the outside of the power tool; The torque adjusting tool is used to engage with the second groove provided on the torque adjusting mechanism to limit the radial rotation of the torque adjusting mechanism and / or to abut against the first clutch disc to limit the axial displacement of the first clutch disc, so that the power tool does not engage or disengage.

12. The power tool according to claim 11, characterized in that, The housing is also provided with a cover plate, and a switch is connected to the cover plate. The switch can be used in conjunction with the torque adjusting tool to control the cover plate to open or close the first through hole and the second through hole.

13. The power tool according to claim 11, characterized in that, The clutch mechanism further includes a clutch assembly, which is configured as a plurality of clutch steel balls. The first clutch disc has a plurality of first grooves, and the second clutch disc has a plurality of protrusions. The clutch steel balls are partially accommodated in the first grooves. The first clutch disc transmits torque to the second clutch disc interruptibly through the clutch ball and the protrusion.

14. The power tool according to claim 11, characterized in that, The clutch mechanism further includes a clutch assembly, which is configured as a plurality of clutch steel balls. The first clutch disc has a plurality of protrusions, and the second clutch disc has a plurality of first grooves. The clutch steel balls are partially accommodated in the first grooves. The first clutch disc can interruptibly transmit torque to the second clutch disc through the protrusion and the clutch ball.

15. The power tool according to claim 13 or 14, characterized in that, The clutch assembly can also be configured as a hemispherical protrusion, which is integrally formed with the first clutch disc or the second clutch disc.

16. The power tool according to claim 15, characterized in that, The preset distance range is determined based on the height of the protrusion and the diameter of the clutch ball, or the height of the protrusion and the diameter of the hemispherical protrusion. When the axial displacement of the second clutch disc is within the preset distance range, the power tool does not engage the clutch.

17. The power tool according to claim 16, characterized in that, The power tool also includes: The calibration mechanism includes a magnetic component and a magnetic induction component. The magnetic component is fixed on the torque adjustment mechanism, and the magnetic induction component is fixed on the housing and electrically connected to the controller of the power tool. The torque adjustment mechanism is provided with a second groove; When the magnetic component is sensed by the magnetic induction component, the torque adjustment tool can engage with the second groove provided on the torque adjustment mechanism to limit the radial rotation of the torque adjustment mechanism and / or abut against the first clutch disc to limit the axial displacement of the first clutch disc, so that the power tool does not engage or disengage.

18. The power tool according to claim 16, characterized in that, The power tool also includes: A torque detection mechanism, comprising: a magnetic component and a magnetic induction component, wherein the magnetic component is fixedly mounted on the torque adjustment mechanism, and the magnetic induction component is fixedly mounted on the housing and electrically connected to the controller of the power tool; When the locking button locks the torque adjustment mechanism, the magnetic component can be sensed by the magnetic induction component to detect the axial displacement of the torque adjustment mechanism; The displacement is used to determine the torque value of the power tool.

19. The power tool according to claim 16, characterized in that, The power tool also includes: A torque detection mechanism, comprising: a pressure sensor, which is electrically connected to the controller of the power tool and located between the torque adjustment mechanism and the elastic element or between the first clutch disc and the elastic element, for detecting the bias force of the elastic element on the torque adjustment mechanism; The bias force is used to determine the torque value of the power tool.

20. A power tool, characterized in that, The power tools include: A housing, wherein the housing is provided with a through hole; An output shaft, on which a first thread is provided; The drive mechanism includes a motor for outputting power. A clutch mechanism, comprising: a first clutch disc, a second clutch disc, and an elastic element; the motor drives the first clutch disc to rotate, the first clutch disc can interruptibly transmit torque to the second clutch disc, the elastic element is arranged around the output shaft, and one end of the elastic element biases against the second clutch disc; A torque adjustment mechanism is biased by the other end of the elastic element. The torque adjustment mechanism has a second thread, and the torque adjustment mechanism adjusts the biasing force of the elastic element on the second clutch disc by the cooperation of the second thread with the first thread. A clutch detection mechanism, comprising: a magnetic induction component, a magnetic component, and a retainer; the retainer abuts against the second clutch disc, the magnetic component is fixed to the retainer, and the magnetic induction component is fixed to the housing; A locking button, which is partially disposed outside the housing through the through hole; The locking button has a first end and a second end. The first end can engage with the second groove provided on the torque adjustment mechanism so that the torque adjustment mechanism does not follow the rotation of the output shaft and / or the motor. The second end can abut against the cage to limit the axial displacement of the second clutch disc within a preset distance range.

21. The power tool according to claim 20, characterized in that, When the locking button is in the unlocked state, the retainer can undergo axial displacement along with the second clutch disc.

22. The power tool according to claim 20, characterized in that, The locking button is also fitted with a spring, which passes through the through hole and surrounds the locking button in the radial direction to enable the locking button to automatically rebound.

23. The power tool according to claim 20, characterized in that, The clutch mechanism further includes a clutch assembly, which is configured as a plurality of clutch steel balls. The first clutch disc has a plurality of first grooves, and the second clutch disc has a plurality of protrusions. The clutch steel balls are partially accommodated in the first grooves. The first clutch disc transmits torque to the second clutch disc interruptibly through the clutch ball and the protrusion.

24. The power tool according to claim 20, characterized in that, The clutch mechanism further includes a clutch assembly, which is configured as a plurality of clutch steel balls. The first clutch disc has a plurality of protrusions, and the second clutch disc has a plurality of first grooves. The clutch steel balls are partially accommodated in the first grooves. The first clutch disc can interruptibly transmit torque to the second clutch disc through the protrusion and the clutch ball.

25. The power tool according to claim 23 or 24, characterized in that, The clutch assembly can also be configured as a hemispherical protrusion, which is integrally formed with the first clutch disc or the second clutch disc.

26. The power tool according to claim 25, characterized in that, The preset distance range is determined based on the height of the protrusion and the diameter of the clutch ball, or the height of the protrusion and the diameter of the hemispherical protrusion. When the axial displacement of the second clutch disc is within the preset distance range, the power tool does not engage the clutch.

27. The power tool according to claim 26, characterized in that, The power tool also includes: The calibration mechanism includes a magnetic component and a magnetic induction component. The magnetic component is fixed on the torque adjustment mechanism, and the magnetic induction component is fixed on the housing and electrically connected to the controller of the power tool. The torque adjustment mechanism is provided with a second groove; When the magnetic component is sensed by the magnetic induction component, the first end of the locking button can engage with the second groove to prevent the torque adjustment mechanism from rotating with the output shaft and / or the motor, and the second end of the locking button can abut against the cage to limit the axial displacement of the second clutch disc within a preset distance range.

28. The power tool according to claim 26, characterized in that, The power tool also includes: A torque detection mechanism, comprising: a magnetic component and a magnetic induction component, wherein the magnetic component is fixedly mounted on the torque adjustment mechanism, and the magnetic induction component is fixedly mounted on the housing and electrically connected to the controller of the power tool; When the locking button locks the torque adjustment mechanism, the magnetic component can be sensed by the magnetic induction component to detect the axial displacement of the torque adjustment mechanism; The displacement is used to determine the torque value of the power tool.

29. The power tool according to claim 26, characterized in that, The power tool also includes: A torque detection mechanism, comprising: a pressure sensor, which is electrically connected to the controller of the power tool and located between the torque adjustment mechanism and the elastic element or between the first clutch disc and the elastic element, for detecting the bias force of the elastic element on the torque adjustment mechanism; The bias force is used to determine the torque value of the power tool.

30. The power tool according to any one of claims 20-29, characterized in that, The power tool may be equipped with a first locking button and a second locking button on the housing, respectively; The first locking button can engage with the second groove provided on the torque adjusting mechanism to limit the radial rotation of the torque adjusting mechanism, and the second locking button can abut against the retainer to limit the axial movement of the second clutch disc.

Images