Power tool

Abstract

This application discloses a power tool, comprising: an accessory; a housing; at least one mounting portion for selectively mounting the accessory in a detachable manner; at least one sensor; an intermediate component disposed inside the housing, with the sensor disposed on the intermediate component; at least one sensor is disposed on the intermediate component at a position corresponding to each mounting portion, for detecting the installation status of the accessory at the mounting portion; the intermediate component includes an intermediate component body, which is configured as a ring structure or a partially ring structure; at least one sensor is disposed on the ring structure or partially ring structure at a position corresponding to the mounting portion in the circumferential direction. The above technical solution provides a power tool with high safety.

Description

Technical Field

[0001] This application relates to the field of tool technology, specifically to an electric tool. Background Technology

[0002] Power tools play a vital role in daily life and production. They can improve work efficiency and reduce labor intensity. Power tools include angle grinders, which can grind and cut objects.

[0003] Angle grinders can be fitted with guards and / or auxiliary handles to improve user safety during operation. Currently, angle grinders can be started normally without guards and / or auxiliary handles installed, which poses a lower safety risk.

[0004] This section provides background information related to this application, which is not necessarily prior art. Summary of the Invention

[0005] One object of this application is to solve or at least mitigate some or all of the aforementioned problems. Therefore, one object of this application is to provide a power tool with enhanced safety.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] An electric tool includes: an accessory; a housing; at least one mounting portion for selectively mounting the accessory in a detachable manner; at least one sensor; an intermediate component disposed inside the housing, on which the sensor is disposed; and at least one sensor disposed on the intermediate component at a position corresponding to each mounting portion for detecting the installation status of the accessory at the mounting portion.

[0008] In some embodiments, at least one sensor is disposed on the intermediate component in a region close to the corresponding mounting portion.

[0009] In some embodiments, the intermediate component includes an intermediate component body, which is configured as a ring structure or a partial ring structure; at least one sensor is respectively disposed at a position corresponding to the mounting portion in the circumferential direction of the ring structure or the partial ring structure.

[0010] In some embodiments, the intermediate component is a ring-shaped sheet structure.

[0011] In some embodiments, the accessory includes a sensing trigger unit for triggering a change in the output of a sensor at a corresponding location after the accessory is installed on any mounting part.

[0012] In some embodiments, the sensing trigger includes a magnet, and the sensor is a magnetic sensor that detects the magnet.

[0013] In some embodiments, after the accessory is installed on the mounting part, the magnetic field strength of the magnet at the corresponding position on the mounting part is greater than a preset magnetic field threshold.

[0014] In some embodiments, the sensor is a micro switch, and the sensing trigger is used to actuate the active contact of the micro switch at the corresponding position of the mounting part after the accessory is installed to any mounting part.

[0015] In some embodiments, the power tool is an angle grinder, and further includes: a motor; a bearing that rotatably supports the output shaft of the motor; and a tool head configured to be driven to rotate by the motor.

[0016] In some embodiments, the housing includes a columnar portion that houses and supports the motor output shaft; and an intermediate component that surrounds the outer periphery of the columnar portion.

[0017] In some embodiments, the intermediate component includes an intermediate component body, which is configured as an annular structure or a partially annular structure, and the intermediate component body surrounds the outer periphery of the columnar portion; at least one sensor is respectively disposed at a position corresponding to each mounting portion in the circumferential direction of the annular structure or the partially annular structure.

[0018] In some embodiments, the intermediate component is an annular sheet structure, and the plane of the annular sheet structure is perpendicular to the central axis of the columnar portion.

[0019] In some embodiments, the intermediate component is fixed around the columnar portion by a pressure plate or screws.

[0020] In some embodiments, the angle grinder further includes a fan and a gearbox, with the fan located behind the columnar portion; an intermediate component is disposed between the fan and the gearbox.

[0021] In some embodiments, the maximum radial length of the intermediate component is less than or equal to the radius of the fan.

[0022] In some embodiments, the accessory is an auxiliary handle for the operator of the power tool to grip; at least one mounting portion extends through the sidewall of the housing; the power tool also includes a sensing trigger for triggering a change in the sensor output after the auxiliary handle is mounted to the mounting portion.

[0023] In some embodiments, the sensor trigger is disposed on the auxiliary handle.

[0024] In some embodiments, after the auxiliary handle is installed on any mounting part, the distance between the sensing trigger part and the corresponding sensor is less than 5mm.

[0025] In some embodiments, the auxiliary handle includes at least one handle connection portion for connection with the mounting portion, and a sensing trigger portion is disposed on the handle connection portion.

[0026] In some embodiments, the mounting portion is a threaded hole with internal threads, and the handle connection portion is a bolt.

[0027] In some embodiments, the accessory is a cover that partially covers the tool head; the angle grinder also includes a sensing trigger for triggering a change in the sensor output after the cover is installed on the mounting part.

[0028] In some embodiments, the cover includes a cover flange configured to be detachably mounted to the mounting portion.

[0029] In some embodiments, the sensing trigger is disposed on the protective flange.

[0030] In some embodiments, after the cover is installed to the mounting part, the connection between the sensor and the sensing trigger part is parallel to the motor output shaft.

[0031] In some embodiments, after the cover is installed to the mounting part, the minimum gap between the sensing trigger part and the sensor is less than the gap threshold.

[0032] In some embodiments, the cover can rotate around the mounting portion by a preset angle; the sensing trigger portion surrounds at least part of the cover flange, the arc corresponding to the sensing trigger portion is equal to the preset angle, and when the cover rotates around the mounting portion, the minimum gap between the sensing trigger portion and the sensor remains less than the gap threshold to allow the angle grinder to work.

[0033] In some embodiments, the angle grinder further includes a rotating swing arm, comprising: a swing arm body including a first end and a second end; a rotating shaft disposed on the swing arm body for supporting the swing arm body to rotate about the rotating shaft; and an elastic element connected to the swing arm body for providing elastic force; wherein, when the cover is not installed to the mounting part, the elastic element is in a natural state or an initial compressed state, keeping the first end in a first position; when the cover is installed to the mounting part, the cover applies a force to the second end, the elastic element deforms, and the swing arm body rotates about the rotating shaft, moving the first end to a second position; a sensing trigger part is disposed at the first end, and the second position is closer to the sensor than the first position.

[0034] In some embodiments, the cover includes a cover connector configured to be detachably connected to the mounting portion; the cover connector includes a protrusion for applying a force to the second end when the cover is mounted to the mounting portion.

[0035] In some embodiments, the shield can be selectively rotated around the mounting portion by a preset angle; the protrusion surrounds at least a portion of the shield connection portion, the arc corresponding to the protrusion is equal to the preset angle, and when the shield rotates around the mounting portion, the second end is continuously subjected to the force applied by the protrusion to allow the angle grinder to work.

[0036] In some embodiments, the cover connection is a cover flange or a claw structure.

[0037] In some embodiments, the accessories are an auxiliary handle for the operator to grip and a cover that partially covers the tool head; the mounting part includes: a first mounting part for selectively mounting the cover in a detachable manner, and at least one second mounting part for selectively mounting the auxiliary handle in a detachable manner; the sensor includes: a first sensor disposed on the intermediate part for detecting the installation status of the cover at the first mounting part; and at least one second sensor disposed on the intermediate part at a position corresponding to each second mounting part for detecting the installation status of the auxiliary handle at the corresponding second mounting part.

[0038] In some embodiments, a power tool includes: an accessory; a housing; at least one mounting portion for selectively mounting the accessory in a detachable manner; at least one micro switch; an intermediate component disposed inside the housing, the micro switch being disposed on the intermediate component; the at least one micro switch includes a fixed base and a movable contact, the fixed base being fixedly disposed on the intermediate component at a position corresponding to each mounting portion, and the movable contact having a protruding structure extending outward from the fixed base at one end, for displacement by a force applied by the accessory when the accessory is mounted to the mounting portion.

[0039] In some embodiments, the intermediate component further includes at least one switch bracket disposed on the intermediate component at a position corresponding to each mounting portion, for fixing the mounting base of the micro switch.

[0040] In some embodiments, the switch bracket includes at least a first side, and the active contact of the micro switch protrudes from the first side.

[0041] In some embodiments, the protrusion direction of the active contact is perpendicular to the first side surface, and the switch bracket is disposed on the first surface of the intermediate component, with the first side surface forming an angle with the first surface of the intermediate component, so that the mounting portion is located in the protrusion direction of the active contact.

[0042] In some embodiments, after the accessory is installed to the mounting part, the position where the force is applied corresponds to the position of the movable contact relative to the first side.

[0043] In some embodiments, at least one slot is provided on the housing for fixing the switch bracket to the intermediate component.

[0044] In some embodiments, the micro switch further includes an elastic contact sleeve disposed outside the protruding structure of the movable contact to reduce displacement of the movable contact when the accessory is installed to the mounting portion.

[0045] In some embodiments, the micro switch further includes a rigid contact disposed on the side of the resilient contact sleeve opposite to the movable contact, for contacting the accessory when the accessory is installed to the mounting portion.

[0046] In some embodiments, the accessory is an auxiliary handle for the operator to grip; at least one mounting portion extends through the sidewall of the housing; the auxiliary handle includes at least one handle connection portion connected to the mounting portion, the handle connection portion including a contact area for applying a force to a movable contact at a corresponding position of the mounting portion when the handle connection portion is connected to any mounting portion, causing the movable contact to displace.

[0047] In some embodiments, when the handle connection is connected to any mounting part, the displacement direction of the contact area is approximately parallel to the displacement direction of the movable contact.

[0048] In some embodiments, when the handle connection is connected to any mounting part, the maximum displacement of the contact area is greater than or equal to the displacement detection threshold of the micro switch for the moving contact, and less than or equal to a preset multiple of the maximum stroke of the moving contact, wherein the preset multiple is 3 times.

[0049] In some embodiments, when the handle connection is connected to different mounting parts, the maximum displacement of the contact area is the same, and the displacement of the movable contact generated by the maximum displacement is within the preset displacement range.

[0050] In some embodiments, the mounting portion is a threaded hole with internal threads, the handle connection portion is a bolt, and the contact area is the end face of the bolt away from the body of the auxiliary handle.

[0051] In some embodiments, the area of ​​the contact region is greater than or equal to its contact area with the moving contact.

[0052] In some embodiments, the power tool is an angle grinder, and further includes: a motor; a bearing rotatably supporting the output shaft of the motor; and a tool head configured to be driven to rotate by the motor.

[0053] In some embodiments, the housing includes a columnar portion that houses and supports the bearing; and an intermediate component configured to surround the bottom periphery of the columnar portion.

[0054] In some embodiments, the accessory is a protective cover that partially covers the tool head; a through hole is provided in the side wall region of the housing near the mounting part; the protective cover includes a protective cover connecting part that is detachably connected to the mounting part, for applying a force to the movable contact through the through hole when connected to the mounting part, so as to cause the movable contact to displace.

[0055] In some embodiments, the active contact protrudes at least partially from the sidewall of the housing through a through-hole.

[0056] In some embodiments, the micro switch further includes a rigid contact disposed outside the protruding structure of the movable contact, the rigid contact protruding at least partially from the sidewall of the housing through a through hole.

[0057] In some embodiments, the micro switch further includes a resilient contact sleeve disposed between the rigid contact and the movable contact to reduce the displacement caused by the force exerted on the movable contact by the cover connection.

[0058] In some embodiments, the end of the rigid contact away from the movable contact is configured as a circular end face; when the cover connection is connected to the mounting portion, a force along the axial direction of the through hole is applied to the circular end face, causing the movable contact to displace.

[0059] In some embodiments, the displacement direction of the movable contact is parallel to the bearing axial direction; when the cover connection is connected to the mounting portion, displacement occurs in a direction perpendicular to the bearing axial direction.

[0060] In some embodiments, the cover connection portion is provided with a protrusion, which is used to apply force to the movable contact through the through hole when the cover connection portion is connected to the mounting portion.

[0061] In some embodiments, the cover can be selectively rotated around the mounting portion by a preset angle; the protrusion surrounds at least a portion of the cover connection portion, the arc corresponding to the protrusion is equal to the preset angle, and when the cover rotates around the mounting portion, the protrusion continuously applies a force to the movable contact to allow the angle grinder to work.

[0062] In some embodiments, a power tool includes an accessory; a housing; at least one mounting portion for selectively mounting the accessory in a detachable manner; at least one magnetic sensor; an intermediate component disposed inside the housing, on which the magnetic sensors are disposed; at least one magnetic sensor fixedly disposed on the intermediate component at a position corresponding to each mounting portion; and at least one magnetic structure disposed on the accessory, configured to generate different magnetic field strengths at the magnetic sensors corresponding to the mounting portions in two states: when the accessory is mounted and when it is not mounted to any mounting portion.

[0063] In some embodiments, the magnetic structure is configured such that, after the accessory is installed to any mounting part, the minimum distance between the magnetic sensor corresponding to the mounting part and the mounting part is less than a first distance threshold, the first distance threshold being related to the magnetic field strength range of the magnetic structure.

[0064] In some embodiments, the positional interval between any two magnetic sensors on the intermediate component is greater than a second distance threshold, which is related to the range of magnetic field strength of the magnetic structure.

[0065] In some embodiments, after the accessory is installed on the mounting part, the line connecting the magnetic structure and the magnetic sensor corresponding to the mounting part is perpendicular to the plane where the intermediate component is located.

[0066] In some embodiments, the accessory is an auxiliary handle for the operator of the power tool to grip; at least one mounting portion extends through the side wall of the housing; the auxiliary handle includes at least one handle connection portion connected to the mounting portion, the handle connection portion including a magnetic structure for generating a magnetic field strength greater than a first magnetic field threshold at a magnetic sensor at a corresponding position of the mounting portion when the handle connection portion is connected to any mounting portion.

[0067] In some embodiments, when the handle connection is connected to different mounting parts, the magnetic field strength generated at the magnetic sensor at the corresponding position of the magnetic structure in different mounting parts is similar.

[0068] In some embodiments, when the handle connection is connected to any mounting part, the magnetic field strength generated by the magnetic structure at the magnetic sensor at the corresponding position of the other mounting part is less than the second magnetic field threshold.

[0069] In some embodiments, the mounting portion is a threaded hole with internal threads, and the handle connection portion is a bolt.

[0070] In some embodiments, the magnetic structure is a magnet built into the bolt; when the handle connection is connected to any mounting part, the magnet is at least partially located inside the housing.

[0071] In some embodiments, the power tool is an angle grinder, and further includes: a motor; a bearing that rotatably supports the output shaft of the motor; and a tool head configured to be driven to rotate by the motor.

[0072] In some embodiments, the housing includes a columnar portion that houses and supports the bearing; and an intermediate component configured to surround the outer periphery of the columnar portion.

[0073] In some embodiments, the accessory is a cover that partially covers the tool head.

[0074] In some embodiments, a power tool includes an accessory; a housing; at least one mounting portion for selectively mounting the accessory in a detachable manner; at least one sensor, corresponding to a specific mounting portion, for detecting the installation status of the accessory at each mounting portion; a motor; and a controller electrically connected to and driving the motor; the controller is configured to: acquire detection signals from the sensors regarding the installation status of the accessory; if the accessory is installed at any mounting portion, control the motor to drive in a normal mode; and if the accessory is not installed at any mounting portion, control the motor to operate in a first safety mode.

[0075] In some embodiments, the installation includes at least two installation levels, with different degrees of tightness between the accessories and the mounting parts corresponding to different installation levels; the signal parameters of the detection signals corresponding to each installation level are different, and the signal parameters are positively / inversely correlated with the installation level.

[0076] In some embodiments, the controller is further configured to determine whether the installation status is "installed" based on the signal parameters of the detected signal and a first parameter threshold.

[0077] In some embodiments, the controller is further configured to: control the motor to be in a first safety mode when it is determined, based on the signal parameters of the detection signal and the threshold of the second parameter, that the installation is a loose connection.

[0078] In some embodiments, the first safety mode is a stop mode, or an operation mode in which the maximum speed is less than a first speed threshold.

[0079] In some embodiments, the power tool is an angle grinder, and further includes: a bearing that rotatably supports the output shaft of the motor; a housing that includes a columnar portion that houses and supports the bearing; and a tool head configured to be rotated by the motor.

[0080] In some embodiments, the accessories are an auxiliary handle for the operator to grip and a guard that partially covers the tool head; the mounting portion includes: a first mounting portion for selectively mounting the guard in a detachable manner, and at least one second mounting portion for selectively mounting the auxiliary handle in a detachable manner; the sensor includes: a first sensor disposed corresponding to the first mounting portion for outputting a first detection signal indicating the installation status of the guard at the first mounting portion; at least one second sensor disposed corresponding to each second mounting portion for outputting a second detection signal indicating the installation status of the auxiliary handle at the corresponding second mounting portion; the controller is configured to control the operating state of the motor based on the acquired first detection signal and / or second detection signal.

[0081] In some embodiments, the controller is configured to allow the motor to operate normally when it is determined from a first detection signal that the cover has been installed on the first mounting part.

[0082] In some embodiments, the controller is configured to allow the motor to operate normally when it is determined, based on a second detection signal, that the auxiliary handle has been installed to a second mounting portion.

[0083] In some embodiments, the auxiliary handle includes at least two handle connecting portions for detachably connecting to the second mounting portion; the controller is configured to allow the motor to operate normally when it is determined, based on a second detection signal, that at least two handle connecting portions of the auxiliary handle have been installed to the second mounting portion.

[0084] In some embodiments, the controller is configured to allow the motor to operate normally when it is determined, based on a first detection signal, that the guard has been installed to a first mounting portion, and based on a second detection signal, that the auxiliary handle has been installed to a second mounting portion.

[0085] In some embodiments, the controller is configured to: determine a current control mode, the control mode including at least a first mode, a second mode, and a third mode; when in the first mode, and when it is determined according to a first detection signal that the guard has been installed to a first mounting part, allow the motor to operate normally; when in the second mode, and when it is determined according to a second detection signal that the auxiliary handle has been installed to a second mounting part, allow the motor to operate normally; when in the third mode, and when it is determined according to the first detection signal that the guard has been installed to the first mounting part, and according to the second detection signal that the auxiliary handle has been installed to a second mounting part, allow the motor to operate normally.

[0086] In some embodiments, an angle grinder includes: a motor; a bearing rotatably supporting the output shaft of the motor; a housing including a columnar portion housing and supporting the bearing; a tool head configured to rotate via the motor; a controller electrically connected to the motor and driving the motor to operate; a guard partially covering the tool head; a first mounting portion for selectively mounting the guard in a removable manner; an auxiliary handle for the operator of the angle grinder to grip; the housing including at least one second mounting portion for selectively mounting the auxiliary handle in a removable manner; a switch control module electrically connected to the controller to form a first circuit loop; the switch control module includes an auxiliary handle detection switch and a guard detection switch; each auxiliary handle detection switch corresponds to a second mounting portion, and the auxiliary handle detection switch is configured to close after the auxiliary handle is mounted to the corresponding second mounting portion; the guard detection switch is configured to close after the guard is mounted to the corresponding first mounting portion; the switch control module is configured to conduct the first circuit loop when at least one auxiliary handle detection switch and / or the guard detection switch is closed.

[0087] In some embodiments, the switch control module includes an output terminal and at least one input terminal electrically connected to the controller; each auxiliary handle detection switch and guard detection switch is individually connected between an input terminal and an output terminal.

[0088] In some embodiments, the switch control module includes an output terminal and an input terminal electrically connected to the controller; an auxiliary handle detection switch and a cover detection switch are connected in series between the output terminal and the input terminal; at least one auxiliary handle detection switch is connected in parallel with each other.

[0089] In some embodiments, the angle grinder further includes a gearbox connected to a first circuit loop via a first end and at least one second end; the switch control module includes an output end and an input end electrically connected to the controller; the first end of each auxiliary handle detection switch is electrically connected to a second end of the gearbox, the first end of the guard detection switch is electrically connected to the first end of the gearbox, and the second ends of the auxiliary handle detection switch and the guard detection switch are electrically connected to the input end and the output end, respectively.

[0090] In some embodiments, the controller is configured to control the operating state of the motor based on the conduction status of the first circuit loop.

[0091] The advantage of this application is that the power tool can sense the installation status of the accessories at the mounting point and start the machine only after the accessories are installed, which provides higher safety. Attached Figure Description

[0092] Figure 1 This is a perspective view of an angle grinder equipped with a protective cover and an auxiliary handle according to one embodiment;

[0093] Figure 2 yes Figure 1 Internal structure diagram of the angle grinder in the image;

[0094] Figure 3 yes Figure 1 A 3D view of the motor of the angle grinder in the image;

[0095] Figure 4 This is a perspective view of an angle grinder including an intermediate component, according to one embodiment;

[0096] Figure 5 This is a perspective view of an embodiment where the sensor is a magnetic sensor mounted on an intermediate component;

[0097] Figure 6 This is a perspective view of an embodiment where the sensor is a microswitch mounted on an intermediate component;

[0098] Figure 7a This is a perspective view of an embodiment where the magnet and magnetic sensor are engaged, including a protective cover with a protrusion, not yet mounted on an angle grinder.

[0099] Figure 7b yes Figure 7a A 3D view showing the corresponding protective cover installed on the angle grinder;

[0100] Figure 7c yes Figure 7b Top view of the corresponding guard installed on the angle grinder;

[0101] Figure 8a This is a perspective view of an embodiment where the protective cover is not installed on the angle grinder when the magnet and the magnetic sensor are engaged.

[0102] Figure 8b yes Figure 8a A 3D view showing the corresponding protective cover installed on the angle grinder;

[0103] Figure 9a This is a perspective view of an embodiment where the magnet and magnetic sensor are engaged, but the protective cover including the claw structure is not installed on the angle grinder.

[0104] Figure 9b yes Figure 9a A 3D view showing the corresponding protective cover installed on the angle grinder;

[0105] Figure 9c yes Figure 9b Top view of the corresponding guard installed on the angle grinder;

[0106] Figure 10a This is a perspective view of an embodiment where a magnet and a magnetic sensor are coupled, including a magnet cover mounted on an angle grinder;

[0107] Figure 10b yes Figure 10a Top view of the corresponding guard installed on the angle grinder;

[0108] Figure 11 This is a perspective view of a micro switch and a switch bracket according to one embodiment;

[0109] Figure 12a yes Figure 6 A three-dimensional view of a microswitch including a resilient contact sleeve and a rigid contact element;

[0110] Figure 12b yes Figure 12a Side view of the first micro switch in the middle;

[0111] Figure 13a This is a perspective view of a micro switch being snapped into a housing by a slot, according to one embodiment;

[0112] Figure 13b yes Figure 13a A side-view stereoscopic view;

[0113] Figure 14 This is a schematic diagram of an embodiment where an auxiliary handle is mounted on the housing and contacts a micro switch;

[0114] Figure 15a This is a schematic diagram of a protective cover being mounted on a housing and in contact with a micro switch in one embodiment;

[0115] Figure 15b yes Figure 15a Cross-sectional view of the contact between the protective cover and the micro switch;

[0116] Figure 16 This is a schematic diagram of the connection between the controller and the motor in one embodiment;

[0117] Figure 17 This is a schematic diagram of the connection between the switch control module and the controller in one embodiment;

[0118] Figure 18 This is a schematic diagram of the connection between the switch control module and the controller in another embodiment;

[0119] Figure 19This is a schematic diagram of the gearbox being connected to the first circuit loop and the controller in one embodiment;

[0120] Figure 20a This is a perspective view of an embodiment in which a contact connector is provided on an intermediate component;

[0121] Figure 20b yes Figure 20a A 3D view of the corresponding contact connector in contact with the protective cover;

[0122] Figure 20c yes Figure 20a A 3D view of the corresponding contact connector in contact with the auxiliary handle;

[0123] Figure 21 This is an internal schematic diagram of an angle grinder including a switch, according to one embodiment. Detailed Implementation

[0124] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0125] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0126] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0127] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0128] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0129] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0130] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0131] In this application, the terms "device," "module," or "unit" are used to describe devices that can be implemented in hardware or software to perform a specific function.

[0132] In this application, the terms “calculation,” “judgment,” “control,” “determine,” “identify,” etc., refer to the operation and process of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0133] The benefits, other advantages, and solutions to problems will be described below with reference to specific embodiments. However, these benefits, advantages, solutions to problems, and any features that may lead to or make any benefit, advantage, or solution appear or become more significant should not be construed as key, necessary, or essential features of any or all claims.

[0134] The power tool in this application is an angle grinder. For example... Figures 1 to 3 As shown, the angle grinder 100 includes a housing 110, an output shaft (not shown), a motor 120, a transmission assembly (not shown), and a tool head 130. The motor 120 drives the output shaft to rotate, and the transmission assembly transmits power between the motor 120 and the output shaft. During operation, the motor 120 drives the transmission assembly, which in turn causes the output shaft to rotate relative to the housing 110. The tool head 130 is also driven to rotate by the motor 120, and the output shaft drives the tool head 130 located thereon to perform different tasks. The motor 120 includes a motor output shaft 121, and the angle grinder 100 also includes a bearing 101, which supports the motor output shaft 121 and rotates relative to the housing 110. To clearly illustrate the technical solution of this application, the following are also defined: Figure 1 The top, bottom, front, and back sides are shown.

[0135] The housing 110 includes a head 111, a connecting portion 112, and a battery pack coupling portion 113 connected in sequence. The head 111 is located at the front end of the housing 110 and is configured to mount the output shaft and the cutting wheel 102. The battery pack coupling portion 113 is located at the rear end of the housing 110 and is configured to detachably connect the battery pack 200. The connecting portion 112 connects the head 111 and the battery pack coupling portion 113, and a main handle 140 is formed on the connecting portion 112 for the operator to grip. Different materials can be cut by changing different types of cutting wheels 102, and adjustments can be made according to the needs of the site during use. During use, the user can carry multiple rechargeable battery packs 200. After the battery packs 200 are depleted, they can be disassembled and replaced to ensure construction efficiency. Those skilled in the art should understand that, in addition to the battery pack 200, the corresponding components inside the machine can also be powered by mains power or AC power, in conjunction with corresponding rectification, filtering, and voltage regulation circuits.

[0136] The housing 110 also includes a columnar portion 114, which is a hollow structure. The columnar portion 114 is used to accommodate and support the motor output shaft 121, that is, the motor output shaft 121 passes through the columnar portion 114 and is supported by the columnar portion 114. The angle grinder 100 also includes a fan 115 and a gearbox 116. The gearbox 116 is located on the head 111 of the housing 110, and the fan 115 is located inside the housing 110, outside the columnar portion 114, specifically behind the columnar portion 114, for dissipating heat from the motor 120 to ensure that the motor 120 can operate for a long time with high efficiency.

[0137] The angle grinder 100 also includes at least one mounting portion 103 and an accessory 150, the accessory 150 being detachably mounted on the mounting portion 103. There are multiple accessories 150, which can be selectively mounted on the mounting portion 103. Each accessory 150 includes an auxiliary handle 151 and a guard 152. The mounting portion 103 includes a first mounting portion 1031 and a second mounting portion 1032. The guard 152 cooperates with the first mounting portion 1031 and is mounted to partially cover the tool head 130, specifically surrounding at least part of the cutting wheel 102, to block debris generated by the cutting wheel 102 and reduce the probability of debris splashing onto the operator. The auxiliary handle 151 cooperates with the second mounting portion 1032 and is mounted to the second mounting portion 1032 for the operator to grip. The number of second mounting parts 1032 is multiple, so the auxiliary handle 151 can be installed on the second mounting parts 1032 at different positions as needed. Alternatively, the auxiliary handle 151 may have multiple connecting parts, all of which cooperate with the second mounting parts 1032. Or, there may also be multiple auxiliary handles 151, each of which cooperates with a second mounting part 1032. Thus, when operating the angle grinder 100, the operator can hold the main handle 140 with one hand and the auxiliary handle 151 with the other, improving the stability and safety of the angle grinder 100 during operation.

[0138] like Figures 1 to 5 As shown, at least one mounting portion 103 penetrates the side wall of the housing 110, specifically, the second mounting portion 1032 penetrates the side wall of the head 111, allowing the auxiliary handle 151 to be mounted on the head 111 of the housing 110, making it easier for the operator to grip. The auxiliary handle 151 includes a handle connecting portion 1511, which connects the auxiliary handle 151 to the second mounting portion 1032. Optionally, the handle connecting portion 1511 can be a bolt, and the second mounting portion 1032 can be a threaded hole with internal threads. This application uses three second mounting portions 1032, respectively located on the left and right sides and the top of the head 111, as an example for specific description. In addition, the number of second mounting portions 1032 can be other, and they can also be located in other positions of the housing 110; this application does not limit this.

[0139] In some embodiments, the angle grinder 100 further includes an intermediate component 300 and at least one sensor 400. The intermediate component 300 is disposed inside the housing 110, specifically surrounding the outer periphery of the columnar portion 114, and is located between the fan 115 and the gearbox 116. The intermediate component 300 is fixedly disposed on the outer periphery of the columnar portion 114. Optionally, the intermediate component 300 can be fixed to the periphery of the columnar portion 114 by a pressure plate 301 or screws 302. Alternatively, the intermediate component 300 can also be fixedly connected to the periphery of the columnar portion 114 in other ways, which are not limited in this application. The maximum radial length of the intermediate component 300 is less than or equal to the radius of the fan 115 to ensure that the fan 115 can adequately dissipate heat from the motor 120 and the transmission components in the gearbox 116, while the placement of the intermediate component 300 does not increase the radial dimension of the angle grinder 100. The intermediate component 300 is a circuit board.

[0140] At least one sensor 400 is respectively disposed on the intermediate component 300 at a position corresponding to each mounting part 103, for detecting the installation status of the accessory 150 at each mounting part 103. The sensor 400 is disposed on the intermediate component 300 in a region close to the corresponding mounting part 103 to detect the installation status of the accessory 150.

[0141] The intermediate component 300 includes an intermediate component body 310, which is configured as a ring structure or a partially ring structure. The intermediate component 300 is configured as a ring-shaped sheet structure surrounding the outer periphery of the columnar portion 114. At least one sensor 400 is respectively disposed on the ring structure or the partially ring structure at a position corresponding to the mounting portion 103 in the circumferential direction. The plane of the ring-shaped sheet structure is perpendicular to the central axis A of the columnar portion 114, that is, the plane of the intermediate component 300 is perpendicular to the central axis A of the columnar portion 114.

[0142] The attachment 150 includes a sensor triggering part 153, that is, the auxiliary handle 151 and the protective cover 152 are provided with a sensor triggering part 153, which is used to trigger the output of the sensor 400 at the corresponding position to change after the attachment 150 is installed on any mounting part 103.

[0143] In some embodiments, the sensing trigger unit 153 includes a magnetic structure 1531, and the sensor 400 is a magnetic sensor 410 that detects the magnetic structure 1531. The magnetic structure 1531 is configured to generate different magnetic field strengths at the magnetic sensor 410 corresponding to the mounting part 103 in two states: when the accessory 150 is installed and when it is not installed on any mounting part 103. When the accessory 150 is installed on the mounting part 103, the minimum distance between the accessory 150 and the magnetic sensor 410 corresponding to the mounting part 103 is less than a first distance threshold. The first distance threshold is related to the range of magnetic field strength of the magnetic structure 1531, such that the magnetic field strength of the magnetic structure 1531 at the corresponding position on the mounting part 103 is greater than a preset magnetic field threshold. As a result, the magnetic sensor 410 obtains the magnetic field strength of the magnetic structure 1531 at this time, and then determines that the accessory 150 has been installed on any mounting part 103 based on the magnetic field strength being greater than the preset magnetic field threshold. Meanwhile, after the accessory 150 is installed on the mounting part 103, the line connecting the magnetic structure 1531 and the corresponding magnetic sensor 410 on the mounting part 103 is perpendicular to the plane where the intermediate part 300 is located.

[0144] Furthermore, the positional distance between any two magnetic sensors 410 on the intermediate component 300 is greater than a second distance threshold. This second distance threshold is also related to the magnetic field strength range of the magnetic structure 1531, ensuring that no two magnetic sensors 410 will sense a magnetic field strength greater than the preset magnetic field threshold for the same magnetic structure 1531. In other words, each magnetic sensor 410 will only sense a magnetic field strength greater than the preset magnetic field threshold for the magnetic structure 1531 closest to it. The preset magnetic field threshold, the first distance threshold, and the second distance threshold are all determined experimentally. The magnetic structure 1531 can be a magnet 1531, and this application will refer to it as magnet 1531 in the following description.

[0145] In some embodiments, the sensor 400 is a micro switch 420, which includes a movable contact 423. When the accessory 150 is installed on the mounting part 103, the sensing trigger part 153 actuates the movable contact 423 of the micro switch 420 at the corresponding position on the mounting part 103.

[0146] The sensor 400 includes a first sensor 401 and at least one second sensor 402. The first sensor 401 can be a first magnetic sensor 411 or a first micro switch 421, and the second sensor 402 can be a second magnetic sensor 412 or a second micro switch 422. The first sensor 401 is disposed on the intermediate component 300 and is used to detect the installation status of the cover 152 at the first mounting part 1031. At least one second sensor 402 is disposed on the intermediate component 300 at a position corresponding to each second mounting part 1032 and is used to detect the installation status of the auxiliary handle 151 at the corresponding second mounting part 1032.

[0147] In some embodiments, the angle grinder 100 further includes a controller 170 and a circuit board 104. The controller 170 is mounted on the circuit board 104, electrically connected to the motor 120, and drives the motor 120 to operate. Figure 2 As shown, circuit board 104 is located at the tail of angle grinder 100. The intermediate component 300 and circuit board 104 are connected by wires for signal transmission. The wires pass through motor 120 and are secured by multiple slots in housing 110. Thus, controller 170 can obtain the installation status of accessory 150 at intermediate component 300 and control motor 120 accordingly.

[0148] The controller 170 is configured to acquire a detection signal 430 from the sensor 400 regarding the installation status of the accessory 150. If the accessory 150 is installed on any mounting part 103, the controller 120 is driven in normal mode; if the accessory 150 is not installed on any mounting part 103, the controller 120 is in a first safety mode. The installation status includes at least two installation levels, with different levels corresponding to varying degrees of tightness between the accessory 150 and the mounting part 103. The signal parameters of the detection signal 430 for each installation level are different. Optionally, the tightness of the installation can be positively correlated with the installation level, with higher tightness indicating a higher installation level. Optionally, the tightness of the installation can be negatively correlated with the installation level, with higher tightness indicating a lower installation level. Optionally, the signal parameters can be positively correlated with the installation level, with higher installation levels resulting in larger signal parameters. Optionally, the signal parameters can also be negatively correlated with the installation level, with higher installation levels resulting in smaller signal parameters. The first safety mode is either a stop mode or an operation mode where the maximum speed is less than a first speed threshold, where the first speed threshold is a lower speed determined based on experience.

[0149] The controller 170 determines whether the accessory 150 has been installed on any mounting part 103 by: the controller 170 determining whether the installation status is "installed" based on the signal parameters of the detection signal 430 and a first parameter threshold; if the signal parameters are greater than or equal to the first parameter threshold, the accessory 150 is installed on the mounting part 103; otherwise, it is not installed. The controller 170 also determines whether the installation status is "loose connection" based on the signal parameters of the detection signal 430 and the second parameter threshold; if the second parameter threshold is less than the first parameter threshold, and the signal parameters are less than the second parameter threshold, the accessory 150 is loosely connected to the mounting part 103, at which point the controller 170 controls the motor 120 to be in a first safety mode. Specifically, a loose connection refers to a situation where the accessory 150's stability on the mounting part 103 is poor, and there is a probability that the accessory 150 will disconnect after the angle grinder 100 is started.

[0150] The following describes in detail the process of mounting the sensor triggering unit 153, which includes a magnet 1531, the sensor 400, which is a magnetic sensor 410, and the accessory 150, which is an auxiliary handle 151, onto the second mounting unit 1032:

[0151] In this embodiment, the second mounting portion 1032 comprises three mounting portions, and the magnetic sensor 410 comprises three second magnetic sensors 412. Magnets 1531 are disposed on the auxiliary handle 151, specifically on the handle connection portion 1511 of the auxiliary handle 151. When none of the auxiliary handles 151 are mounted on the second mounting portions 1032, the magnets 1531 located on the auxiliary handles 151 are not mounted on the second mounting portions 1032, and therefore the second magnetic sensors 412 cannot detect the magnets 1531.

[0152] like Figure 4 and 5 As shown, when one auxiliary handle 151 is installed on each of the three second mounting portions 1032, or two auxiliary handles 151 are installed on any two of the second mounting portions 1032, or all three auxiliary handles 151 are installed on the second mounting portions 1032, the magnet 1531 on each auxiliary handle 151 is at least partially located inside the housing 110. The distance between the magnet 1531 on each auxiliary handle 151 and the corresponding second magnetic sensor 412 disposed on the intermediate component 300 is less than 5 mm. Therefore, the magnetic field strength generated by each magnet 1531 at the corresponding position of the second magnetic sensor 412 on different second mounting portions 1032 is similar, and the magnetic field strength generated by the second magnetic sensor 412 at the corresponding position of each magnet 1531 is greater than the first magnetic field threshold, so that the second magnetic sensor 412 can be triggered by the magnet 1531. Optionally, the distance between the magnet 1531 and the corresponding second magnetic sensor 412 disposed on the intermediate component 300 is 1 mm. Optionally, the distance between the magnet 1531 and the corresponding second magnetic sensor 412 disposed on the intermediate component 300 is 2.5 mm. Optionally, the distance between the magnet 1531 and the corresponding second magnetic sensor 412 disposed on the intermediate component 300 is 3.7 mm. Furthermore, the magnetic field strength generated by each magnet 1531 at the corresponding position of the second magnetic sensor 412 on the other second mounting portion 1032 is less than the second magnetic field threshold. The first magnetic field threshold is the preset magnetic field threshold mentioned above in this application, and the second magnetic field threshold is less than the first magnetic field threshold and is the magnetic field threshold corresponding to the second distance threshold.

[0153] That is, when the second magnetic sensor 412 can be triggered by the magnet 1531, the auxiliary handle 151 has been installed on the second mounting part 1032. Subsequently, the controller 170 controls the motor 120 to operate based on the installation status of the auxiliary handle 151. At this time, the intermediate component 300 and the circuit board 104 can transmit signals via wires, and the controller 170 obtains the installation status of the auxiliary handle 151 based on these wires. This application does not limit the number of wires used for signal transmission.

[0154] The following describes in detail the process of mounting the sensing trigger unit 153, which includes a magnet 1531, the sensor 400, which is a magnetic sensor 410, and the accessory 150, which is a protective cover 152, onto the first mounting part 1031:

[0155] like Figures 7a to 10b As shown, the protective cover 152 includes a protective cover connecting portion 1521, which is located at the uppermost end of the protective cover 152. The protective cover 152 is detachably mounted to the first mounting portion 1031 based on the protective cover connecting portion 1521. The protective cover connecting portion 1521 can be a protective cover flange 1521 or a claw structure 1521.

[0156] In some embodiments, when the magnetic sensor 410 is a first magnetic sensor 411 and the intermediate component body 310 is configured as a partially annular structure, the angle grinder 100 further includes a rotating swing arm 160, which is correspondingly disposed with the protective cover 152 and can be considered as part of the protective cover 152. The rotating swing arm 160 includes a swing arm body 161, a rotating shaft 162, and an elastic element 163. The swing arm body 161 includes a first end 1611 and a second end 1612. A magnet 1531 is disposed on the first end 1611 along the front-back direction, and a protrusion 1613 is formed on the second end 1612. The rotating shaft 162 is disposed on the swing arm body 161 and rotatably connected to the housing 110 for supporting the swing arm body 161 to rotate around the rotating shaft 162. The elastic element 163 is used to provide elastic force. One end of the elastic element 163 is connected to the swing arm body 161, and the other end abuts against the limiting portion 1101 on the housing 110. Among them, the elastic element 163 is a spring.

[0157] When the protective cover 152 is not installed on the first mounting part 1031, such as Figure 7a As shown, the elastic element 163 is in its natural or initially compressed state, causing the first end 1611 to remain in the first position, with the magnet 1531 on the first end 1611 being relatively far from the first magnetic sensor 411. When the protective cover 152 is installed on the first mounting portion 1031, as... Figure 7bAs shown, the protective cover connecting portion 1521 includes a protrusion 1522 for applying force to the second end 1612. Specifically, the protrusion 1522 presses against the protrusion 1613 on the second end 1612, causing the elastic element 163 to deform between the swing arm body 161 and the limiting portion 1101, thus causing the swing arm body 161 to rotate around the pivot 162. The first end 1611 moves towards the first magnetic sensor 411, from the first position to the second position. At this time, the magnet 1531 on the first end 1611 is closer to the first magnetic sensor 411 than in the first position. If the protective cover 152 is removed from the first mounting portion 1031, the elastic force of the elastic element 163 causes the first end 1611 to return to the first position.

[0158] After the protective cover 152 is installed on the first mounting part 1031, the connection between the sensor 400 (first magnetic sensor 411) and the sensing trigger part 153 (magnet 1531) is parallel to the motor output shaft 121. Furthermore, the minimum gap between the sensing trigger part 153 (magnet 1531) and the sensor 400 (first magnetic sensor 411) is less than a gap threshold, that is, the minimum distance between the magnet 1531 and the first magnetic sensor 411 is less than a first distance threshold. In this application, the minimum gap will be used instead of the minimum distance, and the gap threshold will be used instead of the first distance threshold for detailed explanation. Therefore, the magnetic field strength of the magnet 1531 is greater than a preset magnetic field threshold, so that the sensor 400 (first magnetic sensor 411) can be triggered by the sensing trigger part 153 (magnet 1531). The gap threshold is determined experimentally.

[0159] The protective cover 152 can rotate around the first mounting portion 1031 by a preset angle. When the protrusion 1522 is set on the protective cover connecting portion 1521, it at least surrounds a portion of the protective cover connecting portion 1521, and the arc of the protrusion 1522 surrounding it is equal to the preset angle. Figure 7c As shown, when the cover 152 rotates around the first mounting portion 1031, the protrusion 1522 constantly presses against the protrusion 1613 on the second end 1612, and the minimum gap between the sensing trigger portion 153 (magnet 1531) and the sensor 400 (first magnetic sensor 411) remains less than a gap threshold to allow the angle grinder 100 to operate. Therefore, when the cover 152 rotates, the sensor 400 can always be triggered by the sensing trigger portion 153. Here, the angle when the cover 152 is not rotating is defined as 0 degrees, and the clockwise and counterclockwise rotation angles are symmetrical, with the clockwise rotation angle being negative and the counterclockwise rotation angle being positive. Optionally, the preset angle can be from -60 degrees to 60 degrees. Furthermore, the preset angle can also be other angles set according to requirements, which are not limited in this application.

[0160] When the first magnetic sensor 411 can be triggered by the magnet 1531, the protective cover 152 has already been installed on the first mounting part 1031. Subsequently, the controller 170 controls the operation of the motor 120 based on the installation status of the protective cover 152. At this time, the intermediate component 300 and the circuit board 104 are connected by wires for signal transmission, and the controller 170 obtains the installation status of the protective cover 152 based on the wires. This application does not limit the number of wires used for signal transmission.

[0161] In some embodiments, when the shield connection portion 1521 does not include the protrusion 1522, and the intermediate component body 310 is configured as a partially annular structure, such as Figures 8a to 8b As shown, the angle grinder 100 also includes a rotating arm 160, which includes an arm body 161, a rotating shaft 162, and an elastic element 163. The arm body 161 includes a first end 1611 and a second end 1612. A magnet 1531 is disposed on the first end 1611 along the vertical direction, and the second end 1612 is connected to the rotating shaft 162. The arm body 161 also includes a third end 1614, which is disposed between the first end 1611 and the second end 1612 and extends towards the front end. The rotating shaft 162 is disposed on the arm body 161 and rotatably connected to the housing 110, supporting the arm body 161 to rotate around the rotating shaft 162. The elastic element 163 provides elastic force; one end of the elastic element 163 is connected to the arm body 161, and the other end abuts against a limiting portion 1101 on the housing 110. The elastic element 163 is a spring.

[0162] When the protective cover 152 is not installed on the first mounting part 1031, such as Figure 8a As shown, the elastic element 163 is in its natural or initially compressed state, causing the first end 1611 to remain in the first position, with the magnet 1531 on the first end 1611 being relatively far from the first magnetic sensor 411. When the protective cover 152 is installed on the first mounting portion 1031, as... Figure 8b As shown, the protective cover 152 cooperates with the first mounting part 1031 to press the third end 1614. The elastic element 163 is deformed by the compression between the swing arm body 161 and the limiting part 1101. The third end 1614 moves upward, causing the swing arm body 161 to rotate around the pivot 162. The first end 1611 moves towards the first magnetic sensor 411, from the first position to the second position. The magnet 1531 on the first end 1611 is closer to the first magnetic sensor 411 than in the first position. At this time, the minimum gap between the magnet 1531 and the first magnetic sensor 411 is less than the gap threshold, and the magnetic field strength is greater than the preset magnetic field threshold. The first magnetic sensor 411 can be triggered by the magnet 1531. If the protective cover 152 is removed from the first mounting part 1031, the elastic force of the elastic element 163 causes the first end 1611 to return to the first position.

[0163] That is, when the first magnetic sensor 411 can be triggered by the magnet 1531, the protective cover 152 has already been installed on the first mounting part 1031. Subsequently, the controller 170 controls the operation of the motor 120 based on the installation status of the protective cover 152. At this time, the intermediate component 300 and the circuit board 104 are connected by wires for signal transmission, and the controller 170 obtains the installation status of the protective cover 152 based on the wires. This application does not limit the number of wires used for signal transmission.

[0164] In some embodiments, when the shield connecting portion 1521 does not include the protrusion 1522, the shield connecting portion 1521 is a claw structure 1521, and the intermediate component body 310 is configured as a partially annular structure, such as Figures 9a to 9c As shown, the angle grinder 100 includes a rotating swing arm 160 and Figure 8a The rotating swing arm 160 in the middle has the same structure. When the protective cover 152 is not installed on the first mounting part 1031, such as Figure 9a As shown, the elastic element 163 is in its natural or initially compressed state, causing the first end 1611 to remain in the first position, with the magnet 1531 on the first end 1611 being relatively far from the first magnetic sensor 411. When the protective cover 152 is installed on the first mounting portion 1031, as... Figure 9b As shown, the claw structure 1521 includes a claw boss 1523. The claw boss 1523 cooperates with the first mounting part 1031 to press the third end 1614. The elastic element 163 is deformed by the compression between the swing arm body 161 and the limiting part 1101. The third end 1614 moves upward, causing the swing arm body 161 to rotate around the pivot 162. The first end 1611 moves towards the first magnetic sensor 411, from the first position to the second position. The magnet 1531 on the first end 1611 is closer to the first magnetic sensor 411 than in the first position. At this time, the minimum gap between the magnet 1531 and the first magnetic sensor 411 is less than the gap threshold, and the magnetic field strength is greater than the preset magnetic field threshold. The first magnetic sensor 411 can be triggered by the magnet 1531. If the cover 152 is removed from the first mounting part 1031, the elastic force of the elastic element 163 causes the first end 1611 to return to the first position.

[0165] At this time, when the claw boss 1523 is set on the claw structure 1521, it at least surrounds a portion of the claw structure 1521, and the arc of the claw boss 1523 surrounding it is equal to the preset angle of rotation of the protective cover 152 around the first mounting part 1031. Figure 9cAs shown, when the protective cover 152 rotates around the first mounting portion 1031, the claw protrusion 1523 always engages with the first mounting portion 1031 to press against the third end 1614, and the minimum gap between the magnet 153 and the first magnetic sensor 411 remains less than the gap threshold. Therefore, when the protective cover 152 rotates, the first magnetic sensor 411 is always triggered by the magnet 1531. The specific details of the preset angle are as described above in this application and will not be repeated here.

[0166] That is, when the first magnetic sensor 411 can be triggered by the magnet 1531, the protective cover 152 has already been installed on the first mounting part 1031. Subsequently, the controller 170 controls the operation of the motor 120 based on the installation status of the protective cover 152. At this time, the intermediate component 300 and the circuit board 104 are connected by wires for signal transmission, and the controller 170 obtains the installation status of the protective cover 152 based on the wires. This application does not limit the number of wires used for signal transmission.

[0167] In some embodiments, when the intermediate component body 310 is configured as a ring structure, such as Figures 10a to 10b As shown, the first magnetic sensor 411 is located at the lowest end of the middle component body 310, the cover connection part 1521 is the cover flange 1521, and the magnet 1531 is located on the cover flange 1521 of the cover 152, specifically on the cover flange 1521, surrounding at least part of the cover flange 1521.

[0168] When the protective cover 152 is not installed on the first mounting part 1031, the magnet 1531 located on the protective cover flange 1521 is not installed on the first mounting part 1031, and the first magnetic sensor 411 cannot sense the magnet 1531. When the protective cover 152 is installed on the first mounting part 1031, such as Figure 10a As shown, the distance between the first magnetic sensor 411 and the magnet 1531 is small, the minimum gap between the magnet 1531 and the first magnetic sensor 411 is less than the gap threshold, the magnetic field strength is greater than the preset magnetic field threshold, and the first magnetic sensor 411 can be triggered by the magnet 1531.

[0169] At this time, when the magnet 1531 is placed on the protective flange 1521, it at least surrounds a portion of the protective flange 1521, and the arc of the magnet 1531 surrounding it is equal to a preset angle by which the protective flange 152 rotates around the first mounting portion 1031. For example... Figure 10b As shown, when the protective cover 152 rotates around the first mounting portion 1031, the minimum gap between the magnet 153 and the first magnetic sensor 411 remains less than the gap threshold. Therefore, the first magnetic sensor 411 is always triggered by the magnet 1531 when the protective cover 152 rotates. The specific details of the preset angle are as described above in this application and will not be repeated here.

[0170] That is, when the first magnetic sensor 411 can be triggered by the magnet 1531, the protective cover 152 has already been installed on the first mounting part 1031. Subsequently, the controller 170 controls the operation of the motor 120 based on the installation status of the protective cover 152. At this time, the intermediate component 300 and the circuit board 104 are connected by wires for signal transmission, and the controller 170 obtains the installation status of the protective cover 152 based on the wires. This application does not limit the number of wires used for signal transmission.

[0171] like Figure 6 and Figure 11 As shown, the micro switch 420 includes a movable contact 423 and a fixed base 424. The fixed base 424 is disposed on the intermediate component 300 at a position corresponding to each mounting portion 103. The movable contact 423 has a protruding structure 4231 extending outward toward the corresponding mounting portion 103 at one end away from the fixed base 424. The protruding structure 4231 is displaced by the force applied by the attachment 150 when the attachment 150 is installed on the mounting portion 103.

[0172] In some embodiments, when the micro switch 420 is a first micro switch 421, there is one first micro switch 421; when the micro switch 420 is a second micro switch 422, there are multiple second micro switches 422. This application uses three second micro switches 422 as an example for specific description. For example... Figure 6 As shown, the first micro switch 421 and the second micro switch 422 have different shapes, and the size and volume of the first micro switch 421 are smaller than that of the second micro switch 422.

[0173] The intermediate component 300 also includes at least one switch bracket 320, which is disposed on the first surface 303 of the intermediate component 300 at a position corresponding to each mounting part 103, for fixing the fixing base 424 of the micro switch 420. In this embodiment of the application, there are four switch brackets 320, which is the same number as the micro switches 420.

[0174] The switch bracket 320 includes a first side surface 321, and the movable contact 423 of the micro switch 420 protrudes from the first side surface 321. The first side surface 321 includes a hole 3211, the size of which matches the size of the movable contact 423. The movable contact 423 protrudes from the first side surface 321 through the hole 3211. Specifically, when the micro switch 420 is a second micro switch 422, the first side surface 321 forms an angle with the first surface 303 of the intermediate component 300; when the micro switch 420 is a first micro switch 421, the first side surface 321 forms an angle with or is parallel to the first surface 303 of the intermediate component 300. This ensures that the mounting portion 103 is located in the protruding direction of the movable contact 423, so that the accessory 150, after being mounted on the mounting portion 103, contacts the protruding structure 4231 of the movable contact 423. When the accessory 150 is installed on the mounting part 103, the position where the force of the accessory 150 is applied corresponds to the position of the movable contact 423 relative to the first side 321, that is, the protruding structure 4231 of the movable contact 423 protrudes from the first side 321 by a height H.

[0175] In some embodiments, such as Figure 12a and Figure 12b As shown, the micro switch 420 also includes a resilient contact sleeve 425, which is disposed on the outside of the protruding structure 4231 of the movable contact 423 to reduce the displacement of the movable contact 423 when the accessory 150 is installed on the mounting part 103. This prevents the slight change in pressure applied when the accessory 150 is accidentally activated from causing displacement of the movable contact 423.

[0176] In some embodiments, the micro switch 420 further includes a rigid contact 426, which is disposed on the side of the resilient contact sleeve 425 opposite to the movable contact 423. Specifically, the resilient contact sleeve 425 is disposed between the protruding structure 4231 of the movable contact 423 and the rigid contact 426, for contacting the accessory 150 when it is mounted on the mounting portion 103. Optionally, the rigid contact 426 can be made of metal, such as copper. Optionally, the rigid contact 426 can also be made of plastic. Figure 12a and Figure 12b As shown, both the first micro switch 421 and the second micro switch 422 are provided with elastic contact sleeves 425, while only the first micro switch 421 is provided with a rigid contact 426.

[0177] The housing 110 is also provided with at least one slot 1102, which cooperates with the intermediate component 300 to fix the switch bracket 320. There are four slots 1102, the same number as the switch brackets 320. The shape and size of the slots 1102 can vary, depending on the specific microswitch 420 to be fixed. Figure 13a and Figure 13b As shown, the slot 1102a for fixing the upper second micro switch 422 is a stepped slot, the slot 1102b for fixing the left and right second micro switches 422 is a recessed slot, and the slot 1102c for fixing the lower first micro switch 421 is a through hole so that the first micro switch 421 can pass through and be snapped into it.

[0178] The following details the process of installing the sensor 400 (microswitch 420), the accessory 150 (auxiliary handle 151), and the auxiliary handle 151 onto the second mounting part 1032:

[0179] In this embodiment, the second mounting portion 1032 comprises three mounting portions, each penetrating the sidewall of the head 111. The auxiliary handle 151 includes a handle connecting portion 1511, which includes a contact area 1512. The contact area 1512 is a side end face away from the body of the auxiliary handle 151. Figure 14 As shown, when the auxiliary handle 151 is installed on the second mounting portion 1032, the handle connecting portion 1511 connects to and passes through the second mounting portion 1032, and the contact area 1512 contacts the second micro switch 422 at the corresponding position, applying force to the movable contact 423, causing the movable contact 423 to displace. The area of ​​the contact area 1512 is greater than or equal to its contact area with the movable contact 423, allowing the handle connecting portion 1511 to apply sufficient force to the movable contact 423. The auxiliary handle 151 can be installed on all three second mounting portions 1032, or two auxiliary handles 151 can be installed on any two second mounting portions 1032, or all three auxiliary handles 151 can be installed on all three second mounting portions 1032.

[0180] When the handle connection 1511 is connected to any of the second mounting portions 1032, the displacement direction of the contact area 1512 is nearly parallel to the displacement direction of the movable contact 423, both moving towards compressing the movable contact 423. The maximum displacement of the contact area 1512 is greater than or equal to the displacement detection threshold of the second microswitch 422 for the movable contact 423, and less than or equal to a preset multiple of the maximum stroke of the movable contact 423. This ensures that the contact area 1512 allows sufficient displacement of the movable contact 423 to be detected while preventing the displacement of the contact area 1512 from exceeding the maximum stroke of the movable contact 423. Furthermore, when different auxiliary handles 151 are mounted on different second mounting portions 1032, the maximum displacement of the contact area 1512 of the handle connection 1511 of each auxiliary handle 151 is the same, and the displacement of the movable contact 423 caused by the maximum displacement of the contact area 1512 is also within a preset displacement range. The preset multiple can be 3 times. Optionally, the preset multiple is 1.1 times. Optionally, the preset multiplier is 1.5x. Optionally, the preset multiplier is 1.8x. Optionally, the preset multiplier is 2.3x. Optionally, the preset multiplier is 2.7x.

[0181] Furthermore, when the micro switch 420 includes a resilient contact sleeve 425, the handle connection portion 1511 indirectly compresses the movable contact 423 based on the resilient contact sleeve 425. The resilient contact sleeve 425 is used to reduce the displacement of the movable contact 423 when the accessory 150 is installed on the mounting portion 103. For example, when the force applied to the micro switch 420 by the auxiliary handle 151 causes the resilient contact sleeve 425 to displace by 0.8 mm, the resilient contact sleeve 425 deforms under force. Based on the elastic characteristics of the resilient contact sleeve 425, the force transmitted to the protruding structure 4231 of the movable contact 423 reduces the displacement of the movable contact 423 to 0.3 mm.

[0182] After the auxiliary handle 151 is removed from the second mounting part 1032, the movable contact 423 or the movable contact 423 and the resilient contact sleeve 425 are restored to their initial state without being compressed.

[0183] That is, after the second microswitch 422 is sufficiently displaced by the force applied by the handle connection part 1511, the auxiliary handle 151 is installed on the second mounting part 1032. Subsequently, the controller 170 controls the operation of the motor 120 based on the installation status of the auxiliary handle 151. At this time, signal transmission occurs between the intermediate component 300 and the circuit board 104 via wires, and the controller 170 obtains the installation status of the auxiliary handle 151 based on these wires. This application does not limit the number of wires used for signal transmission.

[0184] The following details the process of installing sensor 400 (microswitch 420), accessory 150 (protective cover 152), and protective cover 152 onto the first mounting part 1031:

[0185] like Figure 15a and Figure 15b As shown, a through hole is provided in the side wall region of the housing 110 near the first mounting portion 1031, which is the slot 1102c (through hole 1102c) of the first micro switch 421 described above in this application. The cover connecting portion 1521 is detachably connected to the first mounting portion 1031, and when the cover connecting portion 1521 is connected to the first mounting portion 1031, a force is applied to the movable contact 423 through the slot 1102c, causing the movable contact 423 to displace. The movable contact 423 protrudes at least partially from the side wall of the housing 110 through the slot 1102c, that is, the movable contact 423 passes through the slot 1102c and is exposed outside the housing 110. Since the first micro switch 421 is provided with a rigid contact 426, and the rigid contact 426 is located outside the protruding structure 4231 of the movable contact 423, the movable contact 423 passes through the slot 1102c specifically by the rigid contact 426 passing through the slot 1102c, at least partially protruding from the side wall of the housing 110. The rigid contact 426 has high hardness, which reduces wear on the micro switch 420 when the cover 152 is installed on the first mounting part 1031. Furthermore, the friction between the rigid contact 426 and the cover connection part 1521 is low, resulting in smoother installation. This improves the lifespan of the micro switch 420 and the cover 152, as well as the operator's feel during installation.

[0186] The end of the rigid contact 426 furthest from the movable contact 423 is configured as a circular end face 4261. When the cover connecting part 1521 is connected to the first mounting part 1031, a force is applied to the circular end face 4261 along the axial direction of the slot 1102c, causing the movable contact 423 to displace. The displacement direction of the movable contact 423 is parallel to the axial direction of the bearing 101, i.e., parallel to the front-to-back direction. When the cover connecting part 1521 is connected to the first mounting part 1031, displacement occurs in a direction perpendicular to the axial direction of the bearing 101, i.e., the cover connecting part 1521 is connected to the first mounting part 1031 along the vertical direction.

[0187] The resilient contact sleeve 425 is used to reduce the displacement of the movable contact 423 when the accessory 150 is installed on the mounting part 103. The rigid contact 426 is arranged to contact one end of the resilient contact sleeve 425. For example, when the force applied to the micro switch 420 by the cover connection part 1521 causes the rigid contact 426 to displace by 0.5mm, the resilient contact sleeve 425 deforms under the force. Based on the elastic characteristics of the resilient contact sleeve 425, the force transmitted to the protruding structure 4231 of the movable contact 423 reduces the displacement of the movable contact 423 to 0.3mm.

[0188] In some embodiments, the cover connecting portion 1521 includes a protrusion 1522. When the cover connecting portion 1521 is connected to the first mounting portion 1031, the protrusion 1522 applies force to the movable contact 423 through the slot 1102c. The cover 152 can rotate around the first mounting portion 1031 by a preset angle. When the protrusion 1522 is disposed on the cover connecting portion 1521, it at least surrounds a portion of the cover connecting portion 1521. The arc of the protrusion 1522 surrounding the protrusion is equal to the preset angle to allow the angle grinder 100 to operate. When the cover 152 rotates around the first mounting portion 1031, the protrusion 1522 always applies force to the movable contact 423.

[0189] After the cover 152 is removed from the first mounting part 1031, the movable contact 423 or the movable contact 423 and the elastic contact sleeve 425 are restored to their initial state before being compressed.

[0190] That is, after the first microswitch 421 is sufficiently displaced by the force applied by the handle connection 1511, the protective cover 152 is installed on the first mounting part 1031. Subsequently, the controller 170 controls the operation of the motor 120 based on the installation status of the protective cover 152. At this time, signal transmission is performed between the intermediate component 300 and the circuit board 104 via wires, and the controller 170 obtains the installation status of the protective cover 152 based on these wires. This application does not limit the number of wires used for signal transmission.

[0191] In some embodiments, such as Figure 16As shown, the detection signal 430 includes a first detection signal 431 and a second detection signal 432. The first detection signal 431 corresponds to the installation status of the protective cover 152, and the second detection signal 432 corresponds to the installation status of the auxiliary handle 151. Specifically, a first sensor 401 is disposed corresponding to the first mounting part 1031 and is used to output a first detection signal 431 indicating the installation status of the protective cover 152 at the first mounting part 1031; at least one second sensor 402 is disposed corresponding to the second mounting part 1032 and is used to output a second detection signal 432 indicating the installation status of the auxiliary handle 151 at the corresponding second mounting part 1032. The controller 170 then controls the operation state of the motor 120 based on the acquired first detection signal 431 and / or second detection signal 432.

[0192] Controller 170 controls the normal operation of motor 120, including multiple control scenarios:

[0193] In some embodiments, the controller 170 is configured to allow the motor 120 to operate normally when it is determined, based on a first detection signal 431, that the cover 152 has been installed to the first mounting portion 1031. In some embodiments, the controller 170 is configured to allow the motor 120 to operate normally when it is determined, based on a second detection signal 432, that the auxiliary handle 151 has been installed to a second mounting portion 1032. In some embodiments, when the auxiliary handle 151 includes two handle connecting portions 1511, the controller 170 is configured to allow the motor 120 to operate normally when it is determined, based on a second detection signal 432, that at least two handle connecting portions 1511 of the auxiliary handle 151 have been respectively installed to the second mounting portion 1032. In some embodiments, the controller 170 is configured to allow the motor 120 to operate normally when it is determined, based on a first detection signal 431, that the cover 152 has been installed to the first mounting portion 1031, and based on a second detection signal 432, that the auxiliary handle 151 has been installed to a second mounting portion 1032. When the auxiliary handle 151 includes two handle connecting parts 1511, the auxiliary handle 151 is a C-shaped handle, and both ends of the auxiliary handle 151 have handle connecting parts 1511.

[0194] The installation of the protective cover 152 to the first mounting part 1031 and the installation of the auxiliary handle 151 to the second mounting part 1032 include various cases where the sensing trigger part 153 described above includes a magnet 1531, the sensor 400 is a magnetic sensor 410, and the sensor 400 is a micro switch 420, which will not be described in detail here.

[0195] Therefore, the angle grinder 100 in this application requires the auxiliary handle 151 and / or the guard 152 to be installed on it before the motor 120 of the angle grinder 100 can operate normally, and the angle grinder 100 has a high level of safety.

[0196] In some embodiments, the controller 170 includes multiple control modes, including at least a first mode, a second mode, and a third mode. When the controller 170 is in the first mode and it is determined according to the first detection signal 431 that the cover 152 has been installed to the first mounting portion 1031, the motor 120 is allowed to operate normally. When the controller 170 is in the second mode and it is determined according to the second detection signal 432 that the auxiliary handle 151 has been installed to a second mounting portion 1032, the motor 120 is allowed to operate normally. When the controller 170 is in the third mode and it is determined according to the first detection signal 431 that the cover 152 has been installed to the first mounting portion 1031, and according to the second detection signal 432 that the auxiliary handle 151 has been installed to a second mounting portion 1032, the motor 120 is allowed to operate normally.

[0197] The angle grinder 100 also includes a mode control board 105, which is mounted on the housing 110 of the angle grinder 100. The mode control board 105 allows the operator to select the control mode of the controller 170, meaning the operator can set the controller 170 to a first, second, or third mode as needed, thereby controlling the operation of the motor 120. For example... Figure 1 As shown, in this embodiment, the mode control board 105 is located at the extended foot of the housing 110 of the angle grinder 100. In addition, the mode control board 105 can also be located at any position on the housing 110 that is convenient for the operator to operate. This application does not limit this.

[0198] In some embodiments, the angle grinder 100 further includes a switch control module 180, which is electrically connected to the controller 170 to form a first circuit loop 171. The switch control module 180 includes an auxiliary handle detection switch 181 and a protective cover detection switch 182. Multiple auxiliary handle detection switches 181 are present, each corresponding to a second mounting portion 1032. The auxiliary handle detection switch 181 closes after the auxiliary handle 151 is installed to its corresponding second mounting portion 1032, and the protective cover detection switch 182 closes after the protective cover 152 is installed to its corresponding first mounting portion 1031. Thus, when at least one auxiliary handle detection switch 181 and / or the protective cover detection switch 182 is closed, the first circuit loop 171 is activated. The controller 170 then controls the operation of the motor 120 based on the activation status of the first circuit loop 171.

[0199] In some embodiments, the switch control module 180 includes an output terminal 1801 and at least one input terminal 1802 electrically connected to the controller 170, and each auxiliary handle detection switch 181 and cover detection switch 182 is individually connected between an input terminal 1802 and an output terminal 1801. Figure 17As shown in this embodiment, there are four input terminals 1802. Each input terminal 1802 is connected to one end of an auxiliary handle detection switch 181 or a protective cover detection switch 182. The other ends of the three auxiliary handle detection switches 181 and the protective cover detection switch 182 are connected to the output terminal 1801. Therefore, the first circuit loop 171 is applicable to the first, second, or third modes of the controller 170. The controller 170 controls the operation of the motor 120 according to the installation status of the protective cover 152 and / or the auxiliary handle 151.

[0200] In some embodiments, the switch control module 180 includes an output terminal 1801 and an input terminal 1802 electrically connected to the controller 170. An auxiliary handle detection switch 181 and a cover detection switch 182 are connected in series between the output terminal 1801 and the input terminal 1802, and at least one auxiliary handle detection switch 181 is connected in parallel with each other. Figure 18 As shown in this embodiment, three auxiliary handle detection switches 181 are connected in parallel, with one end of one of the auxiliary handle detection switches 181 connected in series with one end of the cover detection switch 182. The other end of the cover detection switch 182 is connected to the input terminal 1802, and the other ends of all three auxiliary handle detection switches 181 are connected to the output terminal 1801. Therefore, the first circuit loop 171 will only be activated when at least one auxiliary handle detection switch 181 is closed after the cover detection switch 182 is closed. Thus, the first circuit loop 171 in this embodiment is suitable for the third mode of the controller 170, which controls the motor 120 to operate based on the installation status of the cover 152 and the auxiliary handles 151.

[0201] In some embodiments, the gearbox 116 of the angle grinder 100 is connected to a first circuit loop 171 via a first end 1161 and at least one second end 1162. The switch control module 180 includes an output end 1801 and an input end 1802 electrically connected to the controller 170. The auxiliary handle detection switch 181 includes a first end 1811 and a second end 1812, and the guard detection switch 182 includes a first end 1821 and a second end 1822. The first end 1811 of each auxiliary handle detection switch 181 is electrically connected to a second end 1162 of the gearbox 116, and the first end 1821 of the guard detection switch 182 is electrically connected to the first end 1161 of the gearbox 116. The second ends 1812 of the auxiliary handle detection switch 181 and the second end 1822 of the guard detection switch 182 are electrically connected to the output end 1801 and the input end 1802 of the switch control module 180, respectively. Optionally, when the second terminal 1812 of the auxiliary handle detection switch 181 is electrically connected to the output terminal 1801 of the switch control module 180, the second terminal 1822 of the cover detection switch 182 is electrically connected to the input terminal 1802 of the switch control module 180. Alternatively, when the second terminal 1812 of the auxiliary handle detection switch 181 is electrically connected to the input terminal 1802 of the switch control module 180, the second terminal 1822 of the cover detection switch 182 is electrically connected to the output terminal 1801 of the switch control module 180.

[0202] like Figure 19 As shown, this application will specifically illustrate the application with the example where the second end 1812 of the auxiliary handle detection switch 181 is electrically connected to the input end 1802 of the switch control module 180, and the second end 1822 of the protective cover detection switch 182 is electrically connected to the output end 1801 of the switch control module 180. At this time, the gearbox 116 acts as a conductor. When at least one of the auxiliary handle detection switch 181 and / or the protective cover detection switch 182 is closed, the first circuit loop 171 is activated, and the controller 170 controls the motor 120 to operate.

[0203] The following describes the structure corresponding to the gearbox 116 being connected to the first circuit loop 171:

[0204] In some embodiments, the intermediate component 300 is provided with a plurality of contact connectors 330, which are conductive. When the accessory 150 is installed on the mounting part 103, the contact connectors 330 come into contact with the accessory 150, and there is electrical connection between them. The information that the contact connectors 330 and the accessory 150 are in contact and conducting can be transmitted to the controller 170 via wires, and then the controller 170 controls the operation of the motor 120 after determining that the accessory 150 is installed on the mounting part 103. The intermediate component 300 is specifically disposed in the gearbox 116.

[0205] like Figure 20aAs shown in this embodiment, there are four contact connectors 330, and the central component body 310 is configured as a ring structure. The four contact connectors 330 are respectively disposed at the four ends of the central component body 310. Each contact connector 330 extends along the front-back direction, and a portion of the contact connector 330 protrudes from the central component body in the front-back direction. The specific extension direction of the contact connector 330 corresponds to the placement position of the mounting portion 103 so as to contact the attachment 150.

[0206] like Figure 20b and Figure 20c As shown, when the protective cover 152 is installed on the first mounting part 1031, the protective cover connecting part 1521 contacts the corresponding contact connector 330, and the contact connector 330 and the protective cover connecting part 1521 are connected, that is, the protective cover detection switch 182 is closed, so that the first circuit circuit 171 is connected, and the controller 170 can control the motor 120 to operate. When the auxiliary handle 151 is installed on the second mounting part 1032, the handle connecting part 1511 of the auxiliary handle 151 contacts the corresponding contact connector 330, and the contact connector 330 and the handle connecting part 1511 are connected, that is, the auxiliary handle detection switch 181 is closed, so that the first circuit circuit 171 is connected, and the controller 170 can control the motor 120 to operate. Therefore, the motor 120 of the angle grinder 100 can only be started after the protective cover 152 and / or the auxiliary handle 151 are installed, which improves the safety of the angle grinder 100 during use.

[0207] In some embodiments, such as Figure 21 As shown, the angle grinder 100 also includes a switch 190, which includes a first switch 191 and a second switch 192. The first switch 191 is disposed on the housing 110, and the second switch 192 is disposed inside the housing 110. The first switch 191 and the second switch 192 are linked to be opened and closed by a linkage structure 210. The first switch 191 can be pushed in the back-and-forth direction. The second switch 192 includes a toggle button 1921, a first port 1922, a second port 1923, and a third port 1924. Wires are connected to the circuit board 104 on the first port 1922, the second port 1923, and the third port 1924. When the toggle button 1921 is not pushed, the second port 1923 and the third port 1924 are electrically connected, and the motor 120 is not allowed to be powered. After the toggle button 1921 is pushed, the first port 1922 and the second port 1923 are electrically connected, and the motor 120 is allowed to be powered. The switch button 1921 can be equipped with a dustproof structure, which can prevent dust while not affecting the movement of the switch button 1921.

[0208] The linkage structure 210 includes a linkage rod 211 and a linkage elastic element 212. One end of the linkage rod 211 contacts the first switch 191, and the other end contacts the second switch 192. The linkage rod 211 includes a linkage limiting part 2111, which extends vertically. The linkage limiting part 2111 also includes a forward-extending linkage protrusion 2112, on which the linkage elastic element 212 is sleeved. One end of the linkage elastic element 212 is limited by the linkage limiting part 2111. Inside the housing 110, a housing linkage limiting part 1103 is also formed, corresponding to the linkage limiting part 2111. The other end of the linkage elastic element 212 is limited by the housing linkage limiting part 1103. The linkage elastic element 212 can be a spring.

[0209] The linkage lever 211 also includes an extension 2113 extending vertically, the extension 2113 being positioned corresponding to the switching button 1921 of the second switch 192. When the operator pushes the first switch 191 forward, the linkage lever 211 is moved forward by the first switch 191, at which point both ends of the linkage elastic member 212 are limited and compressed by the linkage limiting part 2111 and the housing linkage limiting part 1103. Simultaneously, the extension 2113 moves forward to contact the switching button 1921 and pushes the switching button 1921, switching the electrical connection between the second port 1923 and the third port 1924 to the first port 1922 and the second port 1923. At this time, the motor 120 is powered on, and after the accessory 150 described above is installed on the mounting part 103, the controller 170 controls the motor 120 to start.

[0210] When the operator releases the first switch 191, the linkage elastic element 212 pushes the linkage lever 211 backward based on the elastic force, and the linkage lever 211 drives the first switch 191 to move backward. At the same time, the extension 2113 is no longer in contact with the switching button 1921, and the switching button 1921 automatically resets to the second port 1923 and the third port 1924 for electrical connection, so that the motor 120 is not allowed to be powered on.

[0211] Furthermore, in some embodiments, the linkage structure 210 does not have a linkage elastic element 212, but the switching button 1921 of the second switch 192 has an elastic element. Thus, when the operator pushes the first switch 191 forward, the linkage lever 211 is moved forward by the first switch 191. At this time, the extension 2113 moves forward to contact the switching button 1921 and pushes the switching button 1921. The elastic element in the switching button 1921 is compressed, causing the electrical connection between the second port 1923 and the third port 1924 to switch to an electrical connection between the first port 1922 and the second port 1923. At this time, the motor 120 is powered on. After the accessory 150 described above is installed on the mounting part 103, the controller 170 controls the motor 120 to start. When the operator releases the first switch 191, the elastic element in the switching button 1921 pushes the linkage lever 211 backward based on elastic force, and the linkage lever 211 drives the first switch 191 to move backward. At the same time, the extension 2113 no longer contacts the switch button 1921, and the switch button 1921 automatically resets to the second port 1923 and the third port 1924 for electrical connection, so that the motor 120 is not allowed to be powered on.

[0212] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A power tool, characterized in that, include: appendix; case; At least one mounting part is provided for selectively mounting the accessory in a detachable manner; At least one sensor; An intermediate component is disposed inside the housing, and the sensor is disposed on the intermediate component; in, At least one of the sensors is respectively disposed on the intermediate component at a position corresponding to each of the mounting parts, for detecting the installation status of the accessory at the mounting part; The intermediate component includes an intermediate component body, which is configured as a ring structure or a partially ring structure; at least one of the sensors is respectively disposed at a position corresponding to the mounting part in the circumferential direction of the ring structure or the partially ring structure.

2. The power tool as described in claim 1, characterized in that, The accessory includes a sensing trigger unit, which is used to trigger a change in the output of a sensor at a corresponding position after the accessory is installed on any of the mounting parts.

3. The power tool as described in claim 2, characterized in that, The sensing triggering part includes a magnet, and the sensor is a magnetic sensor that detects the magnet; the magnetic field strength generated at the magnetic sensor corresponding to the mounting part is different in the two states of the accessory being installed and not being installed to any of the mounting parts.

4. The power tool as described in claim 2, characterized in that, The sensor is a micro switch, and the sensing trigger is used to activate the movable contact of the micro switch at the corresponding position of the mounting part after the accessory is installed to any of the mounting parts.

5. The power tool as described in claim 4, characterized in that, The micro switch includes a fixed base and a movable contact. The fixed base is fixedly disposed on the intermediate component at a position corresponding to each of the mounting portions. The movable contact has a protruding structure extending outward from the corresponding mounting portion at one end away from the fixed base, which is used to generate displacement by the force applied by the accessory when the accessory is installed to the mounting portion.

6. The power tool as claimed in claim 1, characterized in that, The accessory is an auxiliary handle for the operator of the power tool to hold; at least one of the mounting portions penetrates the side wall of the housing; the power tool also includes a sensing trigger portion for triggering a change in the output of the sensor after the auxiliary handle is installed on the mounting portion.

7. The power tool as claimed in claim 1, characterized in that, The power tool is an angle grinder, and further includes: a motor; a bearing that rotatably supports the output shaft of the motor; a tool head configured to be driven to rotate by the motor; the accessory is a protective cover that partially covers the tool head; the angle grinder also includes a sensing trigger unit for triggering a change in the output of the sensor after the protective cover is installed on the mounting part.

8. The power tool as claimed in claim 7, characterized in that, The angle grinder further includes a rotating swing arm, comprising: a swing arm body, including a first end and a second end; a rotating shaft, the rotating shaft being disposed on the swing arm body for supporting the swing arm body to rotate around the rotating shaft; and an elastic element, the elastic element being connected to the swing arm body for providing elastic force. When the protective cover is not installed on the mounting part, the elastic element is in a natural state or an initial compressed state, keeping the first end in the first position; when the protective cover is installed on the mounting part, the protective cover applies a force to the second end, the elastic element deforms, and the swing arm body rotates around the pivot, moving the first end to the second position; the sensing trigger part is located on the first end, and the second position is closer to the sensor than the first position.

9. The power tool as claimed in claim 1, characterized in that, The power tool further includes: a motor; and a controller electrically connected to the motor and driving the motor to operate. The controller is configured to: Acquire the sensor's detection signal regarding the installation status of the accessory; If the accessory has been installed to any of the mounting parts, the motor is controlled to drive in normal mode; If the accessory is not installed to any of the mounting parts, the motor is controlled to be in the first safety mode.

10. The power tool as claimed in claim 9, characterized in that, The accessories include an auxiliary handle for the operator to hold and a protective cover that partially covers the tool head; The mounting portion includes: a first mounting portion for selectively mounting the cover in a detachable manner, and at least one second mounting portion for selectively mounting the auxiliary handle in a detachable manner; The sensor includes: a first sensor, disposed corresponding to the first mounting portion, for outputting a first detection signal indicating the installation status of the cover at the first mounting portion; and at least one second sensor, disposed corresponding to each of the second mounting portions, for outputting a second detection signal indicating the installation status of the auxiliary handle at the corresponding second mounting portion. The controller is configured to control the operating state of the motor based on the acquired first detection signal and / or second detection signal.

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