Constant-torque electric tool

Abstract

The invention relates to a constant-torque electric tool. The constant-torque electric tool provided by the embodiment of the invention comprises a constant-torque signal generation device which comprises a clutch function assembly and is used for generating a constant-torque signal through the clutch action of the clutch function assembly under the condition that the output torque of the constant-torque electric tool exceeds the preset torque; the control device is used for obtaining load electrical parameters of the constant-torque electric tool under the condition that the trigger signal is obtained; determining an operation mode according to the load electrical parameters to at least prevent electrostatic interference; wherein the trigger signal comprises a constant torque signal or an interference signal; the interference signal is generated at least under the condition that the constant-torque electric tool is interfered by static electricity; the operation modes comprise at least one of the following modes: a first operation mode used for controlling the constant-torque electric tool to stop; and the second operation mode is used for controlling the constant-torque electric tool to maintain the current working state. The constant-torque electric tool provided by the embodiment of the invention has an anti-static interference capability, and can avoid false triggering of constant-torque shutdown.

Description

Technical Field

[0001] This application relates to the field of power tool control technology, and in particular to a constant torque power tool. Background Technology

[0002] Torque-controlled tools, also known as torque-controlled power tools, are typically power tools that can set and control torque output. Traditional torque-controlled tools generally employ mechanical torque control, which works by using a clutch mechanism to displace a sensor to generate a torque signal. When the controller receives this torque signal, it stops the tool from operating, thus achieving the torque-controlled function.

[0003] However, when a torque-controlled tool comes into contact with static electricity in the air, if it cannot meet the anti-static requirements, it is easily affected by static interference, which may cause it to falsely trigger a torque signal and stop the tool. Summary of the Invention

[0004] In view of this, the present application provides a constant torque electric tool to solve at least one problem existing in the background art.

[0005] This application provides a constant torque power tool, the constant torque power tool comprising:

[0006] A constant torque signal generating device includes a clutch function component, used to generate a constant torque signal by the clutch action of the clutch function component when the output torque of the constant torque power tool exceeds a preset torque; and

[0007] A control device is used to acquire the load electrical parameters of the constant torque power tool when a trigger signal is received; and to determine the operating mode based on the load electrical parameters, so as to at least prevent electrostatic interference.

[0008] The trigger signal includes the constant torque signal or the interference signal; the interference signal is generated at least when the constant torque power tool is subjected to electrostatic interference.

[0009] The operating mode includes at least one of the following:

[0010] The first operating mode is used to control the constant torque power tool to stop.

[0011] The second operating mode is used to control the constant torque electric tool to maintain its current working state.

[0012] In an optional embodiment, the clutch function component includes a drive block, which is used to drive the output shaft of the fixed torque power tool to rotate with the motor when the output torque of the fixed torque power tool is lower than a preset torque, because the force indirectly applied to the drive block by the output torque can drive the output shaft of the fixed torque power tool to rotate with the motor.

[0013] When the output torque of the constant torque power tool exceeds the preset torque, the drive block generates a preset displacement due to the force indirectly received by the output torque, which is insufficient to achieve the drive, and the output shaft of the constant torque power tool does not rotate.

[0014] The constant torque signal generating device is used to generate the constant torque signal according to the preset displacement.

[0015] In one optional embodiment, the load electrical parameters include the load current value or the rate of change of the load current value;

[0016] The step of determining the operating mode based on the load electrical parameters includes:

[0017] If the load current value is greater than or equal to the current threshold, or the rate of change of the load current value is greater than or equal to the rate of change of the current threshold, the trigger signal is considered to be the constant torque signal, and the operation mode is determined to be the first operation mode.

[0018] If the load current value is less than the current threshold, or the rate of change of the load current value is less than the current rate of change threshold, the trigger signal is considered to be the interference signal, and the operating mode is determined to be the second operating mode.

[0019] In one optional embodiment, the load electrical parameters include the load current value or the rate of change of the load current value;

[0020] The step of determining the operating mode based on the load electrical parameters includes:

[0021] If the load current value is greater than or equal to the current threshold, or the rate of change of the load current value is greater than or equal to the rate of change of the current threshold, the trigger signal is considered to be the constant torque signal, and the operation mode is determined to be the first operation mode.

[0022] If the load current value is less than the current threshold, or the rate of change of the load current value is less than the current rate of change threshold, the trigger signal is considered to be the interference signal, and the operating mode is determined to be the second operating mode.

[0023] If the operating mode is determined to be the second operating mode, the operating mode further includes:

[0024] The third operating mode is used to obtain the duration of the trigger signal, and when the duration is greater than or equal to a time threshold, control the constant torque power tool to stop; when the duration is less than the time threshold, control the constant torque power tool to maintain the current working state.

[0025] In an optional embodiment, the constant torque signal generating device further includes a sensor module for generating and outputting the constant torque signal in response to the generation of the preset displacement.

[0026] In one alternative embodiment, the sensor module includes a Hall bar assembly and a Hall sensor;

[0027] The Hall effect sensor assembly is used to move according to the preset displacement of the drive block, so as to generate a first displacement according to the preset displacement;

[0028] The Hall sensor is used to generate and output the constant torque signal based on the first displacement.

[0029] In an optional embodiment, the clutch function component further includes a clutch disc and a clutch ball, used to, when the output torque of the constant torque power tool is lower than a preset torque, have the clutch ball abut against the drive block and the clutch disc, so that the output shaft of the constant torque power tool rotates with the motor;

[0030] When the output torque of the constant torque power tool exceeds the preset torque, the preset displacement generated by the drive block prevents the output shaft of the constant torque power tool from rotating.

[0031] In an alternative embodiment, the constant torque signal generating device further includes a clutch spring for indirectly applying the output torque of the constant torque power tool to the drive block.

[0032] In an optional embodiment, the torque signal generating device further includes a drive ball, a drive cup, and a push rod, which are used to move the drive ball under the push of the drive block when the drive block generates the preset displacement, thereby pushing the drive cup to move, and causing the push rod to move under the push of the drive cup so that the Hall rod assembly generates the first displacement.

[0033] In one optional embodiment, the driving block includes a first driving inclined surface, which forms a first preset angle with the moving direction of the driving block, and is used to drive the driving ball to move in a direction different from the moving direction of the driving block;

[0034] The drive cup includes a second drive inclined surface, which forms a second preset angle with the moving direction of the drive ball, and is used to drive the drive cup to move in a direction different from the moving direction of the drive ball, so as to drive the Hall rod assembly to generate the first displacement.

[0035] The beneficial effects of the technical solution provided in this application include: By combining the trigger signal and the load electrical parameters of the torque-controlled power tool, different operating modes of the control device can be determined, enabling the distinction between a torque-controlled signal and an interference signal. This allows the torque-controlled power tool to perform operations corresponding to the trigger signal, such as stopping or maintaining the current working state, through different operating modes. This avoids accidental shutdown of the torque-controlled power tool due to electrostatic interference, thus mitigating electrostatic interference, reducing the false alarm rate, and improving tool performance. Furthermore, it eliminates the need to change the tool structure; for example, it eliminates the need to increase creepage distance and clearance or add corresponding electronic components to the control board to improve the tool's anti-static capability. The anti-static capability of the tool can be improved solely through the function of the control device, thereby reducing the difficulty of mold making and the cost of the tool.

[0036] Additional aspects and advantages of the embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the embodiments of this application. Attached Figure Description

[0037] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, are provided. The drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show details of those features. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0038] Figure 1 This is a waveform diagram illustrating a specific example of the constant torque signal in an embodiment of this application.

[0039] Figure 2 This is a schematic block diagram illustrating the principle of a specific example of a constant torque power tool in the embodiments of this application.

[0040] Figure 3 This is a schematic block diagram illustrating a specific example of the control device in an embodiment of this application.

[0041] Figure 4 This is a schematic diagram of the change curve of the load current value under the constant torque shutdown condition, which is a specific example of the embodiment of this application.

[0042] Figure 5 A three-dimensional schematic diagram of a specific example of a constant torque power tool according to an embodiment of this application is shown.

[0043] Figure 6 It shows Figure 5 Cross-sectional view along the AA direction;

[0044] Figure 7 It shows Figure 5 Cross-sectional view along the middle BB direction;

[0045] Figure 8 It shows Figure 7 Enlarged view of point C in the middle.

[0046] Explanation of reference numerals in the attached figures:

[0047] 001-Output shaft, 002-Clutch spring, 003-Drive block, 004-Drive cup, 005-Clutch ball, 006-Drive ball, 007-Clutch disc, 008-Secondary planetary gear transmission assembly, 009-DC motor, 010-Push rod, 011-Hall rod assembly, 012-Control board assembly, 31-First drive ramp, 41-Second drive ramp. Detailed Implementation

[0048] 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.

[0049] The embodiments described in this application are not exhaustive, but merely illustrative of some embodiments, and are not intended to limit the scope of protection of this application. 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 with each other. 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.

[0050] In each embodiment of this application, 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.

[0051] The terminology used in the embodiments of this application is for the purpose of describing specific embodiments only and is not intended to limit the scope of this application.

[0052] In the embodiments of this application, 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 after the article can be understood as either a singular expression or a plural expression.

[0053] In the embodiments of this application, "multiple" refers to two or more. In some embodiments, the terms "at least one of", "one or more", "aplurality of", "multiple" and the like can be used interchangeably.

[0054] The prefixes "first," "second," etc., used in the embodiments of this application 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 is based on the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, the numerical value of the descriptive object is not limited by ordinal numbers and can be one or more. Taking "first device" as an example, the numerical 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 descriptive object 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.

[0055] 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”, “above”, “exceeding”, etc. can be used interchangeably, and 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”, “below”, etc. can be used interchangeably.

[0056] In some embodiments, the term "connection" can refer to the transmission of electrical signals or data between the connected end and the connected end, and can be understood as "electrical connection," "communication connection," etc. A "connection" can be a direct connection between two components, an indirect connection established through other components, a connection within two components, or any other possible form of connection.

[0057] In the process of realizing this invention, the inventors discovered the following problems in the related technology:

[0058] When a torque-controlled tool is performing a tightening operation, if the torque output by the torque-controlled tool reaches the set torque, the clutch structure can trigger a sensor (such as a Hall sensor) to generate a torque signal to control the torque-controlled shutdown.

[0059] Figure 1 The diagram shows a waveform of a specific example of a constant torque signal in an embodiment of this application. As shown, the first time T1 can be the start time of the constant torque signal, and the second time T2 can be the end time of the constant torque signal.

[0060] However, when the torque-controlled tool comes into contact with static electricity, the acquisition port that is supposed to acquire the torque signal is susceptible to electrostatic interference, which may cause it to generate interference signals with varying high and low levels. This can lead the torque-controlled tool to mistakenly identify the interference signal as the torque signal (i.e., the T1 to T2 signal segment), resulting in a false trigger shutdown. For example, components such as the clutch mechanism or sensor of the torque-controlled tool may also generate interference signals due to electrostatic interference, or other reasons caused by electrostatic interference may also cause such interference signals to appear on the acquisition port.

[0061] Therefore, embodiments of this application provide a torque-controlled power tool capable of resisting electrostatic interference. For example, the torque-controlled power tool may include at least one of the following: a torque-controlled electric screwdriver / electric screwdriver; a torque gun / torque wrench; an impact torque wrench; and an electric torque wrench.

[0062] Figure 2 A schematic block diagram illustrating a specific example of a constant torque power tool according to an embodiment of this application is shown. As shown, the constant torque power tool may include:

[0063] A constant torque signal generating device 100 includes a clutch function component, used to generate a constant torque signal by disengaging the clutch function component when the output torque of the constant torque power tool exceeds a preset torque; and

[0064] The control device 200 is used to acquire the load electrical parameters of the constant torque power tool when a trigger signal is received; and to determine the operating mode based on the load electrical parameters, so as to at least prevent electrostatic interference.

[0065] The trigger signal includes the constant torque signal or the interference signal; the interference signal is generated at least when the constant torque power tool is subjected to electrostatic interference.

[0066] The operating mode includes at least one of the following:

[0067] The first operating mode is used to control the constant torque power tool to stop.

[0068] The second operating mode is used to control the constant torque electric tool to maintain its current working state.

[0069] In this embodiment, the control device may be named in different ways, such as controller, and no restrictions are placed on the name.

[0070] In some possible implementations, the control device 200 may include a processor and a memory, with the processor connected to the memory, the memory storing instructions, and the processor calling the instructions stored in the memory to implement the functions of the control device 200.

[0071] Figure 3 This diagram illustrates a schematic block diagram of a specific example of the control device in an embodiment of this application. As shown, the processor can be a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction read and execute capabilities, such as a Central Processing Unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a type of microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationships of hardware circuits. The logical relationships of the aforementioned hardware circuits are fixed or reconfigurable. For example, the processor is a hardware circuit implemented using an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and configuring the hardware circuit can be understood as the process of the processor loading instructions to implement the functions described by the instructions. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a Neural Network Processing Unit (NPU), Tensor Processing Unit (TPU), or Deep Learning Processing Unit (DPU). The control device 200 can be implemented entirely through processor-called software, entirely through hardware circuits, or partially through processor-called software with the remainder implemented through hardware circuits.

[0072] The memory may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor may execute the program instructions to implement the functions of the control device 200 and / or other desired functions.

[0073] The control device 200 may further include a network interface, a display, and an input device connected via a system bus. The network interface can be used to communicate with external terminals via a network connection. The display can be a liquid crystal display (LCD) or an e-ink display. The input device can be a touch layer covering the display, or it can be buttons, a trackball, or a touchpad, or it can be an external keyboard, touchpad, or mouse, etc.

[0074] In this embodiment, the preset torque can be a torque set according to actual needs.

[0075] In this embodiment, the constant torque signal generating device may be called by different names, such as constant torque stop triggering device, etc., and the name is not restricted here.

[0076] In some possible implementations, the torque signal generating device can be an existing component of the torque-controlled power tool, requiring no structural modifications to the original device. For example, the torque signal generating device may primarily consist of a clutch mechanism and a Hall switch, but it is not limited to these. When the output torque of the torque-controlled power tool exceeds a preset torque, the torque signal generating device can generate a torque signal, or it can control other devices to generate a torque signal, thereby achieving torque-controlled shutdown of the torque-controlled power tool.

[0077] In some possible implementations, the torque signal generating device can also detect the output torque of the torque-controlled power tool through a mechanical sensor, and generate and output a torque signal when the output torque of the torque-controlled power tool exceeds a preset torque.

[0078] In some possible implementations, the source of the interference signal may include at least one of the following:

[0079] The constant torque signal generator was falsely triggered due to electrostatic interference;

[0080] The constant torque power tool malfunctions due to disturbances in the signal transmission line caused by electrostatic interference.

[0081] The constant torque power tool was malfunctioning due to interference other than electrostatic interference.

[0082] In some possible implementations, the control device 200 can acquire the load electrical parameters (such as load current parameters) of the torque-controlled power tool after receiving a trigger signal to determine the operating mode of the control device 200. Thus, different operating modes of the control device 200 can control the torque-controlled power tool to perform different actions, and both the trigger signal and the load electrical parameters can be used as conditions for determining the operating mode. For example, if the trigger signal received due to electrostatic interference is an interference signal, the torque-controlled power tool can be controlled to maintain its current working state based on the load electrical parameters. This can at least prevent electrostatic interference and avoid accidental triggering and shutdown of the torque-controlled power tool.

[0083] In some possible implementations, the load electrical parameters can be load current parameters or load current change rate, or other physical quantities related to the load, such as speed, voltage, etc.

[0084] In some possible implementations, the constant torque signal can be Figure 1 The T1 to T2 signal segment is at a low level, but it is not limited to this. In this application, high and low levels can be relative values, not limited to absolute values.

[0085] Thus, this embodiment of the application, through a control device, can combine the trigger signal and the load electrical parameters of the torque-controlled power tool to jointly determine different operating modes of the control device, thereby distinguishing whether the trigger signal is a torque signal or an interference signal. This allows the control device to control the torque-controlled power tool to perform operations corresponding to the trigger signal, such as stopping or maintaining the current working state, through different operating modes. This avoids the torque-controlled power tool from being falsely triggered and stopped due to electrostatic interference, achieving tool avoidance of electrostatic interference, reducing the false judgment rate, and improving tool performance. Furthermore, it does not require changes to the tool structure; for example, it does not require structural modifications to increase creepage distance and clearance, or adding corresponding electronic components to the control board to improve the tool's anti-static capability. The tool's anti-static capability can be improved simply through the function of the control device (such as improvements to the software algorithm), thereby reducing the difficulty of structural molding and the cost of the tool.

[0086] In one alternative embodiment, the load electrical parameters include the load current value;

[0087] The step of determining the operating mode based on the load electrical parameters includes:

[0088] If the load current value is greater than or equal to the current threshold, the trigger signal is considered to be a constant torque signal, and the operation mode is determined to be the first operation mode.

[0089] If the load current value is less than the current threshold, the trigger signal is considered to be an interference signal, and the operating mode is determined to be the second operating mode.

[0090] In one alternative embodiment, the load electrical parameters include the rate of change of the load current value;

[0091] The step of determining the operating mode based on the load electrical parameters includes:

[0092] If the rate of change of the load current value is greater than or equal to the current rate of change threshold, the operating mode is determined to be the first operating mode.

[0093] If the rate of change of the load current value is less than the current change rate threshold, the operating mode is determined to be the second operating mode.

[0094] Figure 4 This diagram illustrates a specific example of the load current value variation curve under a constant torque stop scenario, as shown in the embodiment of this application. As the figure shows, the third time T3 can correspond to the first time T1. When the constant torque power tool triggers the constant torque stop, the load current value may change from the third time T3 to the fourth time T4. As time increases, the load current value gradually increases, from the first current value 'a' corresponding to the third time T3 to the maximum current value corresponding to the fourth time T4. Accordingly, a current threshold or a current change rate threshold can be set according to actual needs. For example, the current threshold can be a second current value 'b', where 'a < b < maximum current value'.

[0095] Thus, this embodiment adds a current limiting condition by simultaneously determining whether a trigger signal is obtained and whether the load current value meets the desired conditions. The desired conditions include whether the load current value exceeds a current threshold, or whether the rate of change of the load current value exceeds a current change rate threshold. When both conditions are met simultaneously, the control device's operating mode is determined to be the first operating mode, i.e., the control device controls the constant torque power tool to stop, achieving constant torque shutdown, which at least prevents electrostatic interference and avoids accidental triggering of the shutdown.

[0096] Furthermore, when the load current value does not meet the first preset condition, i.e., when electrostatic interference may occur, the control device does not immediately stop the constant torque power tool. Instead, it can determine the operating mode of the control device to be the second operating mode, so as to temporarily keep the constant torque power tool running or maintain its current working state, and prevent accidental shutdown.

[0097] In one alternative embodiment, the load electrical parameters include the load current value;

[0098] The step of determining the operating mode based on the load electrical parameters includes:

[0099] When the load current value is greater than or equal to the current threshold, the operating mode is determined to be the first operating mode;

[0100] If the load current value is less than the current threshold, the operating mode is determined to be the second operating mode;

[0101] If the operating mode is determined to be the second operating mode, the operating mode further includes:

[0102] The third operating mode is used to obtain the duration of the trigger signal, and when the duration is greater than or equal to a time threshold, control the constant torque power tool to stop; when the duration is less than the time threshold, control the constant torque power tool to maintain the current working state.

[0103] In one alternative embodiment, the load electrical parameters include the rate of change of the load current value;

[0104] The step of determining the operating mode based on the load electrical parameters includes:

[0105] If the rate of change of the load current value is greater than or equal to the current rate of change threshold, the operating mode is determined to be the first operating mode.

[0106] If the rate of change of the load current value is less than the current rate of change threshold, the operating mode is determined to be the third operating mode.

[0107] The operating mode also includes:

[0108] The third operating mode is used to obtain the duration of the trigger signal, and when the duration is greater than or equal to a time threshold, control the constant torque power tool to stop; when the duration is less than the time threshold, control the constant torque power tool to maintain the current working state.

[0109] In this embodiment, the time threshold can be set according to actual needs to determine whether a torque-controlled shutdown is required. For example, the time threshold can be determined based on the time interval between the first time T1 and the second time T2, such as being less than T2-T1.

[0110] In some possible implementations, the load current value of the constant torque power tool may exhibit a variation with the value between the third time T3 and the fourth time T4. Figure 4 The variations shown are different. Thus, in the two cases where the load current value does not meet the expected conditions, it is impossible to determine whether interference, including electrostatic interference, has occurred. For example, the control device may have received a constant torque signal, in which case the constant torque power tool is expected to perform a constant torque stop.

[0111] Thus, in this embodiment, the control device is determined to operate in a third mode when the load current value does not meet the desired conditions in two situations. In this mode, the control device acquires the duration of the trigger signal and determines whether to stop the torque power tool by comparing the duration with a time threshold. For example, if the duration is greater than or equal to the time threshold, the torque power tool can be stopped. Therefore, even when it is not clear whether electrostatic interference has occurred by the change in the load current value, the torque power tool can still be stopped by the duration, ensuring the effective implementation of the torque power tool stop.

[0112] Furthermore, if the duration is less than the time threshold, the control device controls the constant torque power tool to maintain the current working state. If it continues to operate, it can be determined that at least electrostatic interference has occurred. Instead of immediately controlling the constant torque to stop, it can at least prevent electrostatic interference and prevent accidental shutdown.

[0113] Figure 5 A three-dimensional schematic diagram of a specific example of a constant torque electric tool according to an embodiment of this application is shown. Figure 6 It shows Figure 5 Cross-sectional view along the AA direction. Figure 7 It shows Figure 5 A cross-sectional view along the BB direction. As shown in the figure, in an optional embodiment, the clutch function component includes a drive block 003, which is used to drive the output shaft 001 of the fixed torque power tool to rotate with the motor when the output torque of the fixed torque power tool is lower than a preset torque, because the force indirectly applied to the drive block 003 by the output torque can drive the output shaft 001 of the fixed torque power tool to rotate with the motor;

[0114] When the output torque of the constant torque power tool exceeds the preset torque, the drive block 003 is indirectly displaced by the force due to the output torque, which is insufficient to achieve the drive, and the output shaft 001 of the constant torque power tool does not rotate.

[0115] The constant torque signal generating device is used to generate the constant torque signal according to the preset displacement.

[0116] In this embodiment, when the constant torque power tool is working normally, the output torque is indirectly applied to the drive block 003 through the clutch spring 002, which can limit the rotation of the clutch disc 007 with the secondary planetary gear transmission assembly 008. At this time, the output shaft 001 rotates with the motor. When the output torque of the constant torque power tool exceeds the preset torque, the output torque is indirectly applied to the drive block 003 through the clutch spring 002, causing the drive block 003 to produce a preset displacement. The rotation of the secondary planetary gear transmission assembly 008 can only overcome the resistance brought by the drive block 003 to the clutch disc 007, and is insufficient to achieve the above limitation, causing the clutch disc 007 to rotate, while the output shaft 001 does not rotate. At this time, the motor idles, thereby realizing the clutch engagement.

[0117] In some possible implementations, the clutch function component may include a mechanical clutch structure such as a mechanical clutch. The sensor module of the torque signal generation device may include signal switching devices such as Hall sensors or Hall switches. A preset displacement can trigger the Hall switch to generate a Hall signal, which serves as the torque signal. Upon receiving the Hall signal, the control device stops the tool from continuing to operate, thus achieving the torque-controlled function and torque-controlled stop. Alternatively, the sensor module of the torque signal generation device may also include microswitches to generate the torque signal.

[0118] If the output torque exceeds the preset torque and then returns to a value below the preset torque, i.e., when the constant torque power tool is reset, the drive block returns to its initial state without generating a preset displacement, thus not triggering the generation of a constant torque signal.

[0119] Thus, by driving the drive block to generate a preset displacement when the output torque of the constant torque electric tool exceeds the preset torque, the clutch function component will engage or disengage, thereby triggering the generation of the constant torque signal.

[0120] In an optional embodiment, the constant torque signal generating device further includes a sensor module for generating and outputting the constant torque signal in response to the generation of the preset displacement.

[0121] In one alternative embodiment, the sensor module includes a Hall bar assembly 011 and a Hall sensor;

[0122] The Hall rod assembly 011 is used to move according to the preset displacement of the drive block 003, so as to generate a first displacement according to the preset displacement;

[0123] The Hall sensor is used to generate and output the constant torque signal based on the first displacement.

[0124] In an optional embodiment, the clutch function component further includes a clutch disc 007 and a clutch ball 005, used to, when the output torque of the fixed torque power tool is lower than a preset torque, have the clutch ball 005 abut against the drive block 003 and the clutch disc 007, and the force on the drive block 003 is applied to the clutch disc 007 through the clutch ball 005, so as to limit the clutch disc 007 from rotating with the motor, so that the output shaft 001 of the fixed torque power tool rotates with the motor;

[0125] When the output torque of the constant torque power tool exceeds the preset torque, the preset displacement generated by the drive block 003 makes the force on the clutch disc 007 insufficient to achieve the restriction and causes it to rotate with the motor, so that the output shaft 001 of the constant torque power tool does not rotate.

[0126] In an optional embodiment, the constant torque signal generating device further includes a clutch spring 002 for converting the output torque of the constant torque power tool into a force to be applied indirectly to the drive block.

[0127] In an optional embodiment, the torque signal generating device further includes a drive ball 006, a drive cup 004, and a push rod 010, which are used to move the drive ball 006 under the push of the drive block 003 when the drive block 003 generates the preset displacement, thereby pushing the drive cup 004 to move, so that the push rod 010 moves under the push of the drive cup 004 to generate the first displacement of the Hall rod assembly 011.

[0128] In one optional embodiment, the driving block 003 includes a first driving inclined surface, which forms a first preset angle with the moving direction of the driving block, and is used to drive the driving ball 006 to move in a direction different from the moving direction of the driving block;

[0129] The drive cup 004 includes a second drive inclined surface, which forms a second preset angle with the moving direction of the drive ball, and is used to drive the drive cup 004 to move in a direction different from the moving direction of the drive ball, so as to drive the Hall rod assembly 011 to generate the first displacement.

[0130] In this way, through the coordinated action of the drive block, drive ball, drive cup and push rod, the movement of the drive ball, drive cup and push rod driven by the drive block is realized. Furthermore, by changing the direction of movement, the effectiveness and reliability of the movement drive are improved, and the structure of the clutch mechanism can be made more compact, which is conducive to miniaturization.

[0131] In this embodiment, the moving direction of the drive cup and the push rod can be set according to actual needs, for example, parallel to the axial direction of the output shaft 001 of the torque power tool or in the axial direction of the output shaft 001 of the torque power tool.

[0132] Figure 8 It shows Figure 7 Enlarged view at point C. As shown in the figure, the driving block 003 includes a first driving inclined surface 31, which forms a first preset angle with the moving direction of the driving block 003.

[0133] In this embodiment of the application, the first preset angle can be set according to actual needs. For example, by configuring the first preset angle, the moving direction of the driving block 003 can be made perpendicular to the second moving direction of the driving ball 006, so as to simplify the structure.

[0134] For example, such as Figure 8 As shown, the drive ball 006 can move upward in the slot or through hole under the push of the first drive inclined surface 31, perpendicular to the horizontal axis of the output shaft 001.

[0135] In one alternative embodiment, one end of the push rod 010 is connected to the drive cup 004; the other end of the push rod 010 is connected to the Hall rod assembly 011.

[0136] In this embodiment of the application, the second preset angle can be set according to actual needs. For example, by configuring the second preset angle, the moving direction of the drive cup 004 can be made perpendicular to the second moving direction of the drive ball 006, so that the moving direction of the drive cup 004 can be parallel or the same as the axial direction of the output shaft 001 of the constant torque electric tool, thereby enabling the Hall rod assembly 011 to translate the first displacement and improve the Hall sensing accuracy.

[0137] For example, such as Figure 8 As shown, the drive ball 006 can move upward in the groove or through hole under the push of the first drive inclined surface 31, thereby using the second drive inclined surface 41 to push the drive cup 004 to move axially to the left, causing the Hall rod assembly 011 to move to the left, triggering the sensor assembly to generate a constant torque signal.

[0138] In this embodiment of the application, the conversion of power direction can be achieved by the cooperation of the first driving inclined surface 31 and the second driving inclined surface 41 with the clutch ball 005 and the driving ball 006, respectively.

[0139] In some possible implementations, the surfaces of the first driving ramp 31 and the second driving ramp 41 can be treated to reduce friction and make it easier to drive the ball to roll and move. For example, the surfaces can be coated with a lubricating film.

[0140] In this embodiment of the application, the Hall rod assembly 011 includes a sensing magnet, and the movement of the sensing magnet can trigger the sensor assembly to generate a constant torque signal.

[0141] The clutch ball 005 and the drive ball 006 can be made of materials with high rigidity, such as steel, which can improve the stability and reliability of the clutch action assembly.

[0142] In some possible implementations, the constant torque power tool also includes a two-stage planetary gear drive assembly 008, which can be arranged around the circumference of the motor's output shaft to evenly distribute the load.

[0143] In some possible implementations, a DC motor 009 can be installed in the middle of the constant torque power tool, such as in the middle of the push rod 010. This allows for a more rational layout and keeps the tool away from sensor components (such as Hall sensors) to avoid magnetic field interference and improve tool stability.

[0144] A control board assembly 012 can be installed at the tail end of a torque power tool (the output shaft of the torque power tool is the head end), and a control device 200 can be installed on the control board assembly 012.

[0145] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A constant torque power tool, characterized in that, The constant torque power tool includes: A constant torque signal generating device includes a clutch function component, used to generate a constant torque signal by the clutch action of the clutch function component when the output torque of the constant torque power tool exceeds a preset torque; and A control device is used to acquire the load electrical parameters of the constant torque power tool when a trigger signal is received; and to determine the operating mode based on the load electrical parameters, so as to at least prevent electrostatic interference. The trigger signal includes the constant torque signal or the interference signal; the interference signal is generated at least when the constant torque power tool is subjected to electrostatic interference. The operating mode includes at least one of the following: The first operating mode is used to control the constant torque power tool to stop. The second operating mode is used to control the constant torque electric tool to maintain its current working state.

2. The constant torque power tool according to claim 1, characterized in that, The clutch function component includes a drive block, which is used to drive the output shaft of the fixed torque power tool to rotate with the motor when the output torque of the fixed torque power tool is lower than the preset torque, because the force indirectly applied to the drive block by the output torque can drive the output shaft of the fixed torque power tool to rotate with the motor. When the output torque of the constant torque power tool exceeds the preset torque, the drive block generates a preset displacement due to the force indirectly received by the output torque, which is insufficient to achieve the drive, and the output shaft of the constant torque power tool does not rotate. The constant torque signal generating device is used to generate the constant torque signal according to the preset displacement.

3. The constant torque power tool according to claim 1, characterized in that, The load electrical parameters include the load current value or the rate of change of the load current value; The step of determining the operating mode based on the load electrical parameters includes: If the load current value is greater than or equal to the current threshold, or the rate of change of the load current value is greater than or equal to the rate of change of the current threshold, the trigger signal is considered to be the constant torque signal, and the operation mode is determined to be the first operation mode. If the load current value is less than the current threshold, or the rate of change of the load current value is less than the current rate of change threshold, the trigger signal is considered to be the interference signal, and the operating mode is determined to be the second operating mode.

4. The constant torque power tool according to claim 1, characterized in that, The load electrical parameters include the load current value or the rate of change of the load current value; The step of determining the operating mode based on the load electrical parameters includes: If the load current value is greater than or equal to the current threshold, or the rate of change of the load current value is greater than or equal to the rate of change of the current threshold, the trigger signal is considered to be the constant torque signal, and the operation mode is determined to be the first operation mode. If the load current value is less than the current threshold, or the rate of change of the load current value is less than the current rate of change threshold, the trigger signal is considered to be the interference signal, and the operation mode is determined to be the second operation mode. If the operating mode is determined to be the second operating mode, the operating mode further includes: The third operating mode is used to obtain the duration of the trigger signal, and when the duration is greater than or equal to a time threshold, control the constant torque power tool to stop; when the duration is less than the time threshold, control the constant torque power tool to maintain the current working state.

5. The constant torque power tool according to claim 2, characterized in that, The constant torque signal generating device further includes a sensor module for generating and outputting the constant torque signal in response to the generation of the preset displacement.

6. The constant torque power tool according to claim 5, characterized in that, The sensor module includes a Hall bar assembly and a Hall sensor; The Hall effect sensor assembly is used to move according to the preset displacement of the drive block, so as to generate a first displacement according to the preset displacement; The Hall sensor is used to generate and output the constant torque signal based on the first displacement.

7. The constant torque power tool according to claim 2, characterized in that, The clutch function component also includes a clutch disc and a clutch ball, which are used to abut between the drive block and the clutch disc when the output torque of the fixed torque power tool is lower than the preset torque, so that the output shaft of the fixed torque power tool rotates with the motor; When the output torque of the constant torque power tool exceeds the preset torque, the preset displacement generated by the drive block prevents the output shaft of the constant torque power tool from rotating.

8. The constant torque power tool according to claim 7, characterized in that, The torque signal generating device also includes a clutch spring, which is used to indirectly apply the output torque of the torque-controlled power tool to the drive block.

9. The constant torque power tool according to any one of claims 2-8, characterized in that, The torque signal generating device further includes a drive ball, a drive cup, and a push rod, which are used to move the drive ball under the push of the drive block when the drive block generates the preset displacement, thereby pushing the drive cup to move, and causing the push rod to move under the push of the drive cup so that the Hall rod assembly generates the first displacement.

10. The constant torque power tool according to claim 9, characterized in that, The driving block includes a first driving inclined surface, which forms a first preset angle with the moving direction of the driving block, and is used to drive the driving ball to move in a direction different from the moving direction of the driving block; The drive cup includes a second drive inclined surface, which forms a second preset angle with the moving direction of the drive ball, and is used to drive the drive cup to move in a direction different from the moving direction of the drive ball, so as to drive the Hall rod assembly to generate the first displacement.

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