Hand tool

Abstract

The application provides a hand tool for locking or unlocking a workpiece with a circumferential process hole, comprising a first clamping arm and a second clamping arm, one end of the first clamping arm and the second clamping arm is pivotally connected, and the other end is connectable or separable, the first clamping arm and the second clamping arm are further provided with a limiting protrusion on the surface facing the workpiece to be operated, and the limiting protrusion extends into the process hole of the workpiece when the other end of the first clamping arm and the second clamping arm is connected. Through the openable and closable design of the first clamping arm and the second clamping arm, and the cooperation of the limiting protrusion and the circumferential process hole, the applicable scene of the hand tool in the field of mechanical assembly can be expanded.

Description

Technical Field

[0001] This application relates to the field of mechanical assembly, and specifically to a handheld tool. Background Technology

[0002] In the field of mechanical assembly, there are a large number of parts with specific torque requirements, and their process holes are arranged circumferentially on the side of the parts. For such parts, most companies in the industry currently use socket-type limit wrenches for locking or unlocking. However, for some parts that cannot be fitted with limit wrenches, this type of wrench is not very suitable. Utility Model Content

[0003] In view of this, the embodiments of this application are committed to providing a locking or unlocking handheld tool, aiming to expand the applicable scenarios of handheld tools.

[0004] This application provides a handheld tool for locking or unlocking a workpiece with circumferential process holes, including: A first clamping mechanism and a second clamping mechanism, wherein the first clamping mechanism includes a first clamping arm and a first force-applying mechanism connected to each other, and the second clamping mechanism includes a second clamping arm and a second force-applying mechanism connected to each other, wherein the first clamping arm and the second clamping arm are both arc-shaped arm segments for holding the workpiece to be worked, and the first force-applying mechanism and the second force-applying mechanism are respectively used to drive the first clamping arm and the second clamping arm to apply torque, and the first clamping arm and the second clamping arm are provided with limit protrusions on the surfaces of the first clamping arm and the second clamping arm facing the workpiece to be worked; The first clamping arm has a first end and a second end that are far apart from each other, and the second clamping arm has a first end and a second end that are far apart from each other. The first end of the first clamping arm and the first end of the second clamping arm are pivotally connected, so that the first clamping arm and the second clamping arm can rotate relative to each other to put the hand tool into a first state or a second state. In the first state, the second end of the first clamping arm and the second end of the second clamping arm abut against each other, and the limiting protrusion can extend into the process hole of the workpiece to be worked. In the second state, the second end of the first clamping arm and the second end of the second clamping arm are separated from each other, and the limiting protrusion of the first clamping arm and / or the limiting protrusion of the second clamping arm are separated from the process hole of the workpiece.

[0005] Optionally, the first end of the first clamping arm is configured as a protrusion, and the first end of the second clamping arm is configured as a groove, wherein the protrusion of the first clamping arm and the groove of the second clamping arm are inserted into each other. The first clamping arm has a protrusion with an axial through hole, and the second clamping arm has a groove with an axial through hole. The axial through holes of the protrusion and the groove overlap in the orthographic projection along the axial direction. The handheld tool also includes a first fixing member, which passes through the axial through hole of the protrusion of the first clamping arm and the axial through hole of the groove of the second clamping arm, so that the first clamping arm and the second clamping arm can rotate relative to each other.

[0006] Optionally, the second end of the first clamping arm is configured as a groove, and the second end of the second clamping arm is configured as a protrusion. When the handheld tool is in the first state, the groove of the first clamping arm and the protrusion of the second clamping arm are engaged. The first clamping arm has a through hole in its groove, and the second clamping arm has a through hole in its protrusion. The handheld tool also includes a detachable second fixing member. When the handheld tool is in the first state, the second fixing member passes through the through hole in the groove of the first clamping arm and the through hole in the protrusion of the second clamping arm.

[0007] Optionally, when the handheld tool is in the first state, the limiting protrusions are arranged circumferentially, and the limiting protrusions of the first clamping arm and the limiting protrusions of the second clamping arm are arranged symmetrically at the center.

[0008] Optionally, the extension length of the limiting protrusion is adjustable.

[0009] Optionally, both the first clamping arm and the second clamping arm are provided with radial through holes, and the limiting protrusion passes through the radial through holes; The limiting protrusion is a bolt, a spring plunger, or a knob plunger.

[0010] Optionally, the orthographic projection of the first clamping arm along the axial direction is a semi-circular shape, the orthographic projection of the second clamping arm along the axial direction is a semi-circular shape, and when the handheld tool is in the first state, the orthographic projection of the combination of the first clamping arm and the second clamping arm along the axial direction is a circular shape.

[0011] Optionally, the first force-applying mechanism includes a first force-applying rod, and the second force-applying mechanism includes a second force-applying rod. One end of the first force-applying rod is connected to the middle of the outer peripheral surface of the first clamping arm, and one end of the second force-applying rod is connected to the middle of the outer peripheral surface of the second clamping arm.

[0012] Optionally, the first force-applying rod extends in a direction away from the second force-applying rod, and the second force-applying rod extends in a direction away from the first force-applying rod.

[0013] Optionally, the first force-applying mechanism includes a first connector and a first force-applying rod, the first connector connecting the first clamping arm and the first force-applying rod; the second force-applying mechanism includes a second connector and a second force-applying rod, the second connector connecting the second clamping arm and the second force-applying rod; both the first force-applying rod and the second force-applying rod are torque wrenches.

[0014] According to the handheld tool provided in this application, the openable gripping structure composed of the first and second arc-shaped clamping arms with pivot connection effectively solves the problem of poor applicability caused by the traditional socket wrench having to be inserted into the end of the workpiece. Moreover, through the design of the limiting protrusion and the circumferential process hole insertion fit, a reliable lateral connection between the clamping arm and the workpiece is achieved, which can effectively prevent slippage when transmitting torque, significantly enhancing the stability and safety of locking or unlocking operations. At the same time, the openable structure allows the handheld tool to be quickly assembled and disassembled, making it suitable for complex working conditions where the end of the workpiece cannot be accessed or there is interference, expanding the applicable scenarios of the handheld tool and improving work efficiency. Attached Figure Description

[0015] Figure 1 The diagram shown is a structural diagram of the workpiece to be processed in the related technology.

[0016] Figure 2 The image shown is a top view of the first state of the handheld tool in an embodiment of this application.

[0017] Figure 3 The image shown is a top view of the second state of the handheld tool in an embodiment of this application.

[0018] Figure 4 The diagram shown is a structural diagram of the handheld tool and the workpiece in an embodiment of this application.

[0019] Figure 5 The diagram shown is a structural diagram of the first state of the handheld tool in an embodiment of this application.

[0020] Figure 6 The diagram shown is a structural diagram of the second state of the handheld tool in an embodiment of this application.

[0021] Figure 7 The image shown is a top view of the first state of the handheld tool in an embodiment of this application.

[0022] Figure 8 The following is along Figure 7 A sectional view of line AA in the diagram.

[0023] Figure 9 As shown Figure 8 A diagram showing the magnified portion of A in the diagram.

[0024] Figure label: Workpiece to be worked 00, process hole 001, hand tool 01, first clamping arm 11, first end of first clamping arm 111, second end of first clamping arm 112, axial through hole 113, first fixing member 114, first force application mechanism 12, first force application rod 121, second clamping arm 21, first end of second clamping arm 211, second end of second clamping arm 212, through hole 213, second fixing member 214, second force application mechanism 22, second force application rod 221, limiting protrusion 3, spring plunger 31, plunger 311, elastic member 312. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Currently, in many modern industrial assembly scenarios, torque needs to be applied to parts with circumferential process holes to achieve locking or unlocking. Most of the industry currently uses socket limit wrenches, which require disassembly and assembly from the end of the workpiece. However, in complex working conditions where the workpiece cannot be disassembled or assembled from the end, or where the end of the workpiece is inaccessible or there is interference, socket limit wrenches are difficult to use and have poor applicability.

[0027] See Figure 1 Taking a workpiece 00 in the provided related technology as an example, it is a cylindrical structure including mutually perpendicular axial and circumferential directions. The axial direction refers to the direction along the main axis or center line of the cylinder, or the direction parallel to it; the circumferential direction refers to the direction around the outer surface of the cylinder. The workpiece 00 has process holes 001 arranged circumferentially. The two ends of the workpiece 00 also cooperate with other structures. If the size of the other structures is larger than the size of the workpiece 00, or if the size of the two ends of the workpiece 00 is larger than the size of the cylindrical surface where the process holes 001 are located, there will be interference when the sleeve limit wrench is put into the end of the workpiece 00, which limits the applicable scenarios.

[0028] This application provides a handheld tool 01 for locking or unlocking the workpiece mentioned above. See also Figures 2-3The handheld tool 01 includes a first clamping mechanism and a second clamping mechanism. The first clamping mechanism includes a connected first clamping arm 11 and a first force-applying mechanism 12. The second clamping mechanism includes a connected second clamping arm 21 and a second force-applying mechanism 22. Both the first clamping arm 11 and the second clamping arm 21 are arc-shaped arm segments, which can be used to hold the workpiece 00 to be worked on. The first force-applying mechanism 12 and the second force-applying mechanism 22 are used to drive the first clamping arm 11 and the second clamping arm 21 to apply torque. The first clamping arm 11 and the second clamping arm 21 are provided with limiting protrusions 3 on the surface of the process hole 001 facing the workpiece 00. The first clamping arm 11 has a first end 111 and a second end 112 that are far apart from each other. The second clamping arm 21 includes a first end 211 and a second end 112 that are far apart from each other. The second end 212, the first end 111 of the first clamping arm 11, and the first end 211 of the second clamping arm 21 are pivotally connected, so that the first clamping arm 11 and the second clamping arm 21 can rotate relative to each other, so that the handheld tool 01 is in a first state or a second state. When the handheld tool 01 is in the first state, the second end 112 of the first clamping arm 11 and the second end 212 of the second clamping arm 21 abut against each other, and the limiting protrusion 3 can extend into the process hole 001 of the workpiece 00 to be worked. When the handheld tool is in the second state, the second end 112 of the first clamping arm 11 and the second end 212 of the second clamping arm 21 are separated from each other, and the limiting protrusion 3 of the first clamping arm 11 and / or the limiting protrusion 3 of the second clamping arm 21 are separated from the process hole 001 of the workpiece 00.

[0029] In this embodiment, the first clamping mechanism and the second clamping mechanism are mechanisms surrounding the outer surface of the cylindrical body of the workpiece 00 to be worked, used to limit and operate the workpiece 00. The first clamping mechanism includes a first clamping arm 11 and a first force-applying mechanism 12 connected to each other, and the second clamping mechanism includes a second clamping arm 21 and a second force-applying mechanism 22 connected to each other. Both the first clamping arm 11 and the second clamping arm 21 are arc-shaped arm segments, and the arc-shaped arm segments have an inner circumferential surface facing the outer surface of the cylindrical body of the workpiece 00 to be worked. When working with a handheld tool 01, the inner circumferential surfaces of the first clamping arm 11 and the second clamping arm 21 are in contact with the outer surface of the cylindrical body of the workpiece 00 to be worked, used to limit the workpiece 00 to be worked.

[0030] In this embodiment, the inner circumferential surfaces of the first clamping arm 11 and the second clamping arm 21 are provided with limiting protrusions 3. The limiting protrusions 3 are structural components that protrude from the surface of the inner circumferential surfaces. The limiting protrusions 3 can be integrally connected with the clamping arms. When the handheld tool 01 is used for operation, the limiting protrusions 3 extend into the process hole 001 of the workpiece 00 to be operated, realizing a reliable lateral connection between the clamping arms and the workpiece. This effectively prevents slippage when transmitting torque, enhancing the stability and safety of locking or unlocking operations. Of course, in some embodiments, the limiting protrusions 3 can also be structural components separately provided on the clamping arms, such as bolts, spring plungers, knob plungers, etc., as long as the head can extend into the process hole 001.

[0031] In this embodiment, the first clamping arm 11 is an arc-shaped arm segment with a first end 111 and a second end 112 that are far apart from each other. The second clamping arm 21 is an arc-shaped arm segment with a first end 211 and a second end 212 that are far apart from each other. The first end 111 of the first clamping arm 11 and the first end 211 of the second clamping arm 21 are pivotally connected. For example, any one or more of the following connection methods can be used: hinge connection, bolt fastening connection, pin and hole mating connection, etc., so that the first clamping arm 11 and the second clamping arm 21 can rotate relative to each other, so that the handheld tool 01 is in a first state or a second state. In the first state, the second end 112 of the first clamping arm 11 and the second end 212 of the second clamping arm 21 are... 2. The first clamping arm 11 and the second clamping arm 21 abut against each other, forming a closed limiting ring. The limiting protrusion 3 can extend into the process hole 001 of the workpiece 00 to be worked. The inner circumferential surface of the arc-shaped arm segment fits against the outer surface of the cylindrical part of the workpiece 00 to be worked, so as to realize the limiting fit of the hand tool 01 to the workpiece 00 to be worked so as to carry out the operation. In the second state, the second end 112 of the first clamping arm 11 and the second end 212 of the second clamping arm 21 separate from each other. The first clamping arm 11 and the second clamping arm 21 form an open limiting ring. The limiting protrusion 3 of the first clamping arm 11 and / or the limiting protrusion 3 of the second clamping arm 21 separate from the process hole 001 of the workpiece 00, and the hand tool 01 releases the restriction on the workpiece 00 to be worked.

[0032] By employing a pivotally connected first clamping arm 11 and second clamping arm 21 to form an openable gripping structure, in complex working conditions where the workpiece cannot be disassembled or assembled from the end, or where the end of the workpiece is inaccessible or interferes with, the first clamping arm 11 and second clamping arm 21 can directly disassemble or assemble from the side of the workpiece using their openable gripping structure. This effectively solves the problem of poor applicability of socket wrenches caused by having to be inserted into the end of the workpiece. At the same time, the openable structure allows the handheld tool 01 to be quickly assembled and disassembled, improving work efficiency.

[0033] In one embodiment, see Figures 5-6 The first end 111 of the first clamping arm 11 is configured as a protrusion, and the first end 211 of the second clamping arm 21 is configured as a groove. The protrusion of the first clamping arm 11 and the groove of the second clamping arm 21 are inserted into each other. The protrusion of the first clamping arm 11 has an axial through hole 113, and the groove of the second clamping arm 21 has an axial through hole 113. The orthographic projections of the axial through hole 113 of the protrusion and the axial through hole 113 of the groove overlap in the axial direction. The handheld tool also includes a first fixing member 114, which passes through the axial through hole 113 of the protrusion of the first clamping arm 11 and the axial through hole 113 of the groove of the second clamping arm 21, so that the first clamping arm 11 and the second clamping arm 21 can rotate relative to each other.

[0034] In this embodiment, the first end 111 of the first clamping arm 11 is configured as a protrusion, the protruding direction of the protrusion being perpendicular to the axial direction. The first end 211 of the second clamping arm 21 is configured as a groove, the opening direction of the groove being perpendicular to the axial direction. The protrusion and the groove are inserted and engaged to achieve the initial fixation of the first clamping arm 11 and the second clamping arm 21. The protrusion of the first clamping arm 11 has an axial through hole 113, and the groove of the second clamping arm 21 has an axial through hole 113. The axial through holes of the protrusion and the groove are aligned along the axial direction. The first fixing member 114 passes through the axial through hole 113 of the protrusion of the first clamping arm 11 and the axial through hole 113 of the groove of the second clamping arm 21 to achieve the rotational connection of the first clamping arm 11 and the second clamping arm 21 on a plane perpendicular to the axial direction.

[0035] In one embodiment, see Figures 5-6 The second end 112 of the first clamping arm 11 is configured as a groove, and the second end 212 of the second clamping arm 21 is configured as a protrusion. When the handheld tool 01 is in the first state, the groove of the first clamping arm 11 and the protrusion of the second clamping arm 21 are inserted and engaged. The groove of the first clamping arm 11 is provided with a through hole 213, and the protrusion of the second clamping arm 21 is provided with a through hole 213. The handheld tool 01 also includes a detachable second fixing member 214. When the handheld tool 01 is in the first state, the second fixing member 214 passes through the through hole 213 of the groove of the first clamping arm 11 and the through hole 213 of the protrusion of the second clamping arm 21.

[0036] In this embodiment, the second end 112 of the first clamping arm 11 is configured as a groove, the opening direction of which is perpendicular to the axial direction. Of course, in some embodiments, the opening direction of the groove may also be parallel to the axial direction or oriented in any direction. The second end 212 of the second clamping arm 21 is configured as a protrusion, the protruding direction of which is perpendicular to the axial direction. Of course, in some embodiments, the protruding direction of which is parallel to the axial direction or oriented in any direction. The protrusion and the groove are inserted and engaged, so that the handheld tool 01 is in the first state. The groove of the first clamping arm 11 has a through hole 213, and the protrusion of the second clamping arm 21 has a through hole 213. The through hole 213 is an axial through hole. Of course, in some embodiments, the through hole 213 may be a radial through hole or a through hole in any direction. The handheld tool 01 includes a detachable second fixing member 214, which passes through the through hole 213 of the groove of the first clamping arm 11 and the through hole 213 of the protrusion of the second clamping arm 21, thereby locking the handheld tool 01 in the first state.

[0037] In this embodiment, the first clamping arm 11 and the second clamping arm 21 have the same structure. This arrangement can reduce the manufacturing cost of parts and improve assembly efficiency. Since the clamping arms have the same structure, their stiffness, strength and inertial characteristics are also consistent, which can balance the transmission of torque when the handheld tool 01 is working, and enhance the stability of the operation.

[0038] In one embodiment, see Figures 4-5 When the handheld tool 01 is in the first state, the limiting protrusions 3 are arranged circumferentially, and the limiting protrusions 3 of the first clamping arm 11 and the limiting protrusions 3 of the second clamping arm 21 are arranged symmetrically at the center.

[0039] In this embodiment, when the handheld tool 01 is in the first state, the first clamping arm 11 and the second clamping arm form a closed limiting ring. The limiting protrusions 3 on the inner circumferential surface of the arc-shaped arm segment are arranged circumferentially, and the limiting protrusions 3 of the first clamping arm 11 and the limiting protrusions 3 of the second clamping arm 21 are arranged symmetrically in the center, which ensures the balance and stability of torque transmission when the handheld tool 01 is working.

[0040] In one embodiment, the extension length of the limiting protrusion 3 is adjustable. For example, the limiting protrusion 3 can be set as an elastic element. When faced with assembly scenarios where different workpieces 00 have process holes 001 of different depths, or the same workpiece 00 has process holes 001 of different depths, the elastic element can flexibly change its extension length to adapt to process holes 001 of different depths, further expanding the application scenarios of the handheld tool 01.

[0041] In one embodiment, see Figures 5-6 Both the first clamping arm 11 and the second clamping arm 21 are provided with radial through holes, and the limiting protrusion 3 is inserted into the radial through hole. The limiting protrusion 3 is a bolt, a spring plunger 31, or a knob plunger.

[0042] In one embodiment, the radial through hole is a threaded hole, and the limiting protrusion is a bolt. By setting the limiting protrusion 3 to a bolt, the depth of its insertion into the process hole 001 can be controlled by controlling the screw-in distance of the bolt, thus adapting to assembly scenarios with process holes 001 of different depths.

[0043] In one embodiment, see Figures 8-9The radial through hole is a threaded hole, and the limiting protrusion 3 is a spring plunger 31. The spring plunger 31 is provided with a plunger 311 and an elastic element 312. The plunger 311 includes a plunger head and a plunger tail that are far apart from each other. The elastic element 312 is directly connected to the plunger head. The outer surface of the spring plunger 31 is also provided with threads for screwing into the radial through hole. The spring plunger 31 has a two-stage adjustment mechanism for the extension length of the plunger head. The first stage of adjustment is achieved through the external surface thread, which controls the mating depth between the plunger head and the process hole 001 by the depth of screwing into the radial through hole, adapting to assembly scenarios of process holes 001 with different depths. The second stage of adjustment is achieved through the elastic element 312, which can be a spring. When encountering assembly scenarios with process holes 001 of varying depths, multiple spring plungers 31 can apply the same tightening torque. The plunger front end will first encounter the inner wall of the shallower process hole 001, and continue to apply torque. The spring of the spring plunger 31 that is adapted to the shallower process hole 001 is compressed until the tightening torque is reached, completing the assembly of the spring plunger 31 and the hand tool 01. Therefore, the setting of the elastic element 32 further broadens the assembly scenarios of the hand tool 01.

[0044] In one embodiment, the orthographic projection of the first clamping arm 11 along the axial direction is a semi-circular shape, and the orthographic projection of the second clamping arm 21 along the axial direction is a semi-circular shape. When the tooling 01 is in the first state, both ends of the first clamping arm 11 and the second clamping arm 21 are connected to each other, and the orthographic projection of the first clamping arm 11 and the second clamping arm 21 combined along the axial direction is a circular shape.

[0045] The first clamping arm 11 and the second clamping arm 21 are both set as semi-rings. When the two semi-rings are closed, they can naturally fit the circumference of the workpiece 00, guiding the handheld tool 01 to quickly reach the predetermined clamping position.

[0046] In one embodiment, see Figures 5-6 Both the first clamping arm 11 and the second clamping arm 21 are arc-shaped arm segments, including an outer peripheral surface facing away from the workpiece 00 and an inner peripheral surface opposite to the arc-shaped arm segment. The first force-applying mechanism 12 includes a first force-applying rod 121, and the second force-applying mechanism 22 includes a second force-applying rod 221. One end of the first force-applying rod 121 is connected to the outer peripheral surface of the first clamping arm 11, and one end of the second force-applying rod 221 is connected to the outer peripheral surface of the second clamping arm 21.

[0047] In one embodiment, the first force-applying rod 121 is threadedly connected to the first clamping arm 11, and a threaded joint is provided on the first force-applying rod 121, and a corresponding threaded hole is provided on the first clamping arm 11, so as to realize the detachable connection between the first force-applying rod 121 and the first clamping arm 11; the second force-applying rod 221 is also threadedly connected to the second clamping arm 21, and a threaded joint is provided on the second force-applying rod 221, and a corresponding threaded hole is provided on the second clamping arm 21, so as to realize the detachable connection between the second force-applying rod 221 and the second clamping arm 21.

[0048] In one embodiment, the first force-applying mechanism includes a first connector and a first force-applying rod 121. The first connector connects the first clamping arm 11 and the first force-applying rod 121. The second force-applying mechanism includes a second connector and a second force-applying rod 221. The second connector connects the second clamping arm 21 and the second force-applying rod 221. Both the first force-applying rod 121 and the second force-applying rod 221 are torque wrenches.

[0049] By configuring the torque wrench with a connecting piece, a preset and precise torque value can be applied directly to the workpiece 00, avoiding torque overload or underload caused by tool changes or differences in operator perception in related technologies, thereby improving the assembly quality and reliability of the product.

[0050] In one embodiment, the first force-applying rod 121 is connected to the middle of the outer peripheral surface of the first clamping arm 11, and the second force-applying rod 221 is connected to the middle of the outer peripheral surface of the second clamping arm 21. The middle of the outer peripheral surface refers to the central region of the outer arc surface of the semi-circular clamping arm in the circumferential direction. Positioning both the first force-applying rod 121 and the second force-applying rod 221 at the middle of the outer peripheral surface of the lever arm facilitates balanced torque application by the user.

[0051] In one embodiment, the first force-applying rod 121 extends in a direction away from the second force-applying rod 221, and the second force-applying rod 221 extends in a direction away from the first force-applying rod 121.

[0052] The first force-applying lever 121 and the second force-applying lever 221 are arranged to extend radially, so that when the user holds the first force-applying lever 121 and the second force-applying lever 221, the force-applying point of the lever, the contact point between the workpiece 00 and the clamping arm, and the connection point of the first end 111 of the first clamping arm 11 and the first end 211 of the second clamping arm 21 together constitute a force-saving lever system, which facilitates easy and labor-saving operation.

[0053] The present application has been described above with reference to preferred embodiments; however, these embodiments are merely exemplary and illustrative. Various substitutions and modifications can be made to the present application based on these embodiments, all of which fall within the protection scope of the present application.

Claims

1. A handheld tool for locking or unlocking a workpiece with circumferential process holes, characterized in that, include: A first clamping mechanism and a second clamping mechanism, wherein the first clamping mechanism includes a first clamping arm and a first force-applying mechanism connected to each other, and the second clamping mechanism includes a second clamping arm and a second force-applying mechanism connected to each other, wherein the first clamping arm and the second clamping arm are both arc-shaped arm segments for holding the workpiece to be worked, and the first force-applying mechanism and the second force-applying mechanism are respectively used to drive the first clamping arm and the second clamping arm to apply torque, and the first clamping arm and the second clamping arm are provided with limit protrusions on the surfaces of the first clamping arm and the second clamping arm facing the workpiece to be worked; The first clamping arm has a first end and a second end that are far apart from each other, and the second clamping arm has a first end and a second end that are far apart from each other. The first end of the first clamping arm and the first end of the second clamping arm are pivotally connected, so that the first clamping arm and the second clamping arm can rotate relative to each other to put the hand tool into a first state or a second state. In the first state, the second end of the first clamping arm and the second end of the second clamping arm abut against each other, and the limiting protrusion can extend into the process hole of the workpiece to be worked. In the second state, the second end of the first clamping arm and the second end of the second clamping arm are separated from each other, and the limiting protrusion of the first clamping arm and / or the limiting protrusion of the second clamping arm are separated from the process hole of the workpiece to be worked.

2. The handheld tool according to claim 1, characterized in that, The first end of the first clamping arm is configured as a protrusion, and the first end of the second clamping arm is configured as a groove. The protrusion of the first clamping arm and the groove of the second clamping arm are inserted into each other. The first clamping arm has a protrusion with an axial through hole, and the second clamping arm has a groove with an axial through hole. The axial through holes of the protrusion and the groove overlap in the orthographic projection along the axial direction. The handheld tool also includes a first fixing member, which passes through the axial through hole of the protrusion of the first clamping arm and the axial through hole of the groove of the second clamping arm, so that the first clamping arm and the second clamping arm can rotate relative to each other.

3. The handheld tool according to claim 1, characterized in that, The second end of the first clamping arm is configured as a groove, and the second end of the second clamping arm is configured as a protrusion. When the handheld tool is in the first state, the groove of the first clamping arm and the protrusion of the second clamping arm are engaged. The first clamping arm has a through hole in its groove, and the second clamping arm has a through hole in its protrusion. The handheld tool also includes a detachable second fixing member. When the handheld tool is in the first state, the second fixing member passes through the through hole in the groove of the first clamping arm and the through hole in the protrusion of the second clamping arm.

4. The handheld tool according to claim 1, characterized in that, When the handheld tool is in the first state, the limiting protrusions are arranged circumferentially, and the limiting protrusions of the first clamping arm and the limiting protrusions of the second clamping arm are arranged symmetrically at the center.

5. The handheld tool according to claim 4, characterized in that, The extension length of the limiting protrusion is adjustable.

6. The handheld tool according to claim 4, characterized in that, Both the first clamping arm and the second clamping arm are provided with radial through holes, and the limiting protrusion passes through the radial through holes; The limiting protrusion is a bolt, a spring plunger, or a knob plunger.

7. The handheld tool according to claim 1, characterized in that, The orthographic projection of the first clamping arm along the axial direction is a semi-circular shape, the orthographic projection of the second clamping arm along the axial direction is a semi-circular shape, and when the handheld tool is in the first state, the orthographic projection of the combination of the first clamping arm and the second clamping arm along the axial direction is a circular shape.

8. The handheld tool according to claim 7, characterized in that, The first force-applying mechanism includes a first force-applying rod, and the second force-applying mechanism includes a second force-applying rod. One end of the first force-applying rod is connected to the middle of the outer peripheral surface of the first clamping arm, and one end of the second force-applying rod is connected to the middle of the outer peripheral surface of the second clamping arm.

9. The handheld tool according to claim 8, characterized in that, The first force-applying rod extends in a direction away from the second force-applying rod, and the second force-applying rod extends in a direction away from the first force-applying rod.

10. The handheld tool according to claim 1, characterized in that, The first force-applying mechanism includes a first connector and a first force-applying rod, the first connector connecting the first clamping arm and the first force-applying rod; the second force-applying mechanism includes a second connector and a second force-applying rod, the second connector connecting the second clamping arm and the second force-applying rod; both the first force-applying rod and the second force-applying rod are torque wrenches.

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