Testing tool suitable for precision of various single motors

Abstract

The utility model provides a testing tool suitable for various single motor precision, which comprises a testing bottom plate, a testing matching part and a motor connecting part, and is characterized in that the testing matching part is connected with the motor connecting part; the test matching part comprises a test adjustment assembly, a plurality of connection positions and a plurality of test pieces, the plurality of connection positions are installed on the test bottom plate through the test adjustment assembly, and each connection position is provided with one test piece; the motor connecting part comprises a fixing assembly and a plurality of mounting positions, the plurality of mounting positions are mounted on the test bottom plate through the fixing assembly, and each mounting position is provided with a motor body. According to the testing tool, precision testing can be carried out on various motors of different specifications, the overall structure is simple, assembly of components is facilitated, adaptive connection of the motor bodies and the testing pieces is facilitated, the testing requirements are met, testing of the multiple motor bodies can be carried out at the same time, and the testing precision and the testing efficiency can be improved.

Description

Technical Field

[0001] This application relates to the field of motor testing fixture technology, and in particular to a testing fixture suitable for the accuracy of various single motors. Background Technology

[0002] The main function of motor precision testing fixtures is to verify whether the various performance indicators of a motor meet design requirements through precise measurement and evaluation. Specifically, this can include precision verification, performance evaluation, fault diagnosis, quality control, and R&D support.

[0003] Currently, there are many types of motor accuracy testing fixtures on the market, varying in size and shape, but each has its drawbacks. Some are expensive, some have complex structures, some can only test the accuracy of one type of motor, and some cannot measure the accuracy of multiple motors simultaneously. For example, in patent CN221960261U, the motor accuracy testing fixture can perform accuracy testing on a single motor, but its structure is relatively complex, installation is cumbersome, and it can only be used with this type of motor. In patent CN214722791U, the accuracy testing fixture can perform motor accuracy testing, but it cannot perform accuracy testing on multiple single motors simultaneously and can only be used with this type of motor.

[0004] Therefore, it is necessary to design a testing fixture suitable for various single motor accuracies to solve the above problems. Utility Model Content

[0005] In view of this, in order to overcome the shortcomings of the prior art, this utility model provides a test fixture suitable for various single motor accuracies, which effectively solves the problems of complex structure, high manufacturing cost and inability to adapt to various single motor tests of existing motor accuracy test fixtures.

[0006] According to the present invention, a testing fixture suitable for various single motor accuracies is provided. The testing fixture includes a test base plate, a test matching part, and a motor connection part. The test matching part is connected to the motor connection part. The test matching part includes a test adjustment component, multiple connection positions, and multiple test pieces. The multiple connection positions are mounted on the test base plate via the test adjustment component, and each connection position has one test piece mounted on it. The motor connection part includes a fixing component and multiple mounting positions. The multiple mounting positions are mounted on the test base plate via the fixing component, and each mounting position has a motor body mounted on it.

[0007] Preferably, the test matching part and the motor connection part are arranged facing each other; a receiving groove is provided between the test matching part and the motor connection part.

[0008] Preferably, the test adjustment component includes a first fixing block, and the fixing component includes a second fixing block, both the first fixing block and the second fixing block being disposed on the test base plate; the length of the first fixing block in the first direction and the length of the second fixing block in the first direction are both the same as the length of the test base plate in the first direction.

[0009] Preferably, the test adjustment assembly further includes a slide rail and a plurality of sliding blocks, the slide rail being disposed on the first fixed block along the first direction; the plurality of sliding blocks being disposed sequentially and spaced apart from the slide rail, the plurality of sliding blocks being slidably disposed on the slide rail, and each sliding block having a connection position on its top.

[0010] Preferably, the test matching part further includes an installation component, which includes a connecting plate and a connecting block. The test piece is connected to the connecting position through the connecting plate, and the connecting wire of the test piece passes through the connecting block and is connected to the motor body.

[0011] Preferably, the height of the second fixing block is higher than the height of the first fixing block, and the plurality of mounting positions are arranged sequentially and at intervals on the top surface of the second fixing block.

[0012] Preferably, the fixing component includes a plurality of motor matching blocks, and the plurality of motor matching blocks are arranged in a one-to-one correspondence with the plurality of mounting positions.

[0013] Preferably, the plurality of motor matching blocks include a first motor matching block and a second motor matching block. Both the first motor matching block and the second motor matching block include a fixing plate portion and a limiting block portion. The fixing plate portion and the limiting block portion are both disposed at one end of the motor matching block facing the test matching portion. The limiting block portion of the first motor matching block is close to the limiting block portion of the second motor matching block.

[0014] Preferably, the plurality of motor matching blocks further includes a third motor matching block and a fourth motor matching block. The third motor matching block includes an extension portion that extends upward from the top surface of the third motor matching block, and the motor body is disposed in the extension portion. The fourth motor matching block includes a clamping portion that forms a clamping space between the clamping portion and the top surface of the fourth motor matching block, and the motor body is disposed in the clamping space.

[0015] Preferably, the motor connection part further includes a counterweight block, which is connected to the motor body and is disposed in the receiving groove.

[0016] According to this utility model, a testing fixture applicable to various single motor accuracies can perform accuracy tests on motors of different specifications through the cooperation of a test base plate, a test matching part, and a motor connecting part. This testing fixture has a simple overall structure, facilitating component assembly and easy connection between the motor body and the test piece to meet testing requirements. Furthermore, since both the test matching part and the motor connecting part are mounted on the test base plate, a suitable installation position can be selected according to the specifications of the motor body, adapting to various motor bodies. And because each motor body is connected to a test piece, multiple motor bodies can be tested simultaneously, improving testing accuracy and efficiency.

[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of a test fixture applicable to various single motor accuracies according to an embodiment of the present invention is shown;

[0020] Figure 2 A side view of a test fixture applicable to various single-motor accuracies according to an embodiment of the present invention is shown.

[0021] Figure 3 A schematic diagram of the structure of a test adjustment component according to an embodiment of the present invention is shown;

[0022] Figure 4 This diagram shows a partial structural schematic of a test fixture applicable to various single-motor accuracies according to an embodiment of the present invention.

[0023] Reference numerals: 1-Test base plate; 2-Test matching part; 201-First fixing block; 202-Slide rail; 203-Sliding block; 204-Connecting plate; 205-Connecting block; 206-Test piece; 3-Motor connecting part; 301-Second fixing block; 302-Motor body; 303-First motor matching block; 304-Second motor matching block; 305-Fixing plate part; 306-Limiting block part; 307-Third motor matching block; 308-Fourth motor matching block; 309-Extension part; 310-Clamping part; 4-Accommodating groove; 5-Counterweight block; S1-First direction. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0025] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] According to this utility model, a testing fixture suitable for various single motor accuracies is provided, such as... Figures 1 to 4As shown, this test fixture, applicable to various single-motor accuracies, is used for testing motors of different specifications, such as guide rail motors with guide rail modules. The test fixture includes a test base plate 1, a test matching part 2, and a motor connection part 3.

[0029] In the following description, reference will be made to Figures 1 to 4 This section describes the detailed structure of the test base plate 1, test matching part 2, and motor connection part 3 of the test fixture applicable to various single motor accuracies.

[0030] like Figure 1 As shown, in this embodiment, the test base plate 1 is used to support the test matching part 2 and the motor connection part 3. The test base plate 1 can be formed as a cuboid plate with multiple mounting holes. The test matching part 2 and the motor connection part 3 can be installed in suitable positions according to the needs of the motor being tested, and can be installed on the test base plate 1 through the multiple mounting holes. Furthermore, in this embodiment, as... Figure 1 As shown, it also includes a first direction S1, which can be understood as the direction from one end to the other along the length of the cuboid plate. Multiple mounting holes can be, for example, bolt holes, and the test matching part 2 and the motor connection part 3 can be threadedly connected to the bolt holes via bolts.

[0031] Furthermore, the test matching part 2 and the motor connection part 3 are connected to each other for testing. The test matching part 2 and the motor connection part 3 are respectively used to install the test piece 206 and the motor body 302. Specifically, the test matching part 2 may include a test adjustment assembly, multiple connection positions, and multiple test pieces 206. The multiple connection positions are mounted on the test base plate 1 through the test adjustment assembly, and each connection position is equipped with one test piece 206. The motor connection part 3 may include a fixing assembly and multiple mounting positions. The multiple mounting positions are mounted on the test base plate 1 through the fixing assembly, and each mounting position is equipped with one motor body 302. In this way, multiple connection positions and multiple mounting positions can be installed through the test adjustment assembly and the fixing assembly to match motor bodies 302 of different specifications, and each motor body 302 can correspond to a separate test piece 206 for testing the motor body 302. The connection between the test piece 206 and the motor body 302 can be, for example, an electrical connection. The test method can be, for example, controlling the movement of the motor body 302 through an external controller, with the motor body 302 transmitting motion signals to the test piece 206, and the test piece 206 providing feedback on the motion accuracy of the motor body 302.

[0032] Furthermore, in this embodiment, the motor body 302 can be, for example, a guide rail motor. The guide rail motor can include multiple guide rails in different directions, such as a right guide rail motor, a left guide rail motor, and a lower guide rail motor. These motors, with different specifications, can all be installed in the mounting position and can be matched with the test piece 206 at the connection position. The test piece 206 can be, for example, a dial indicator, used to test the guide rail motor.

[0033] This test fixture, applicable to various single-motor precision requirements, enables precision testing of motors of different specifications through the cooperation of the test base plate 1, the test matching part 2, and the motor connecting part 3. The overall structure of this test fixture is simple, facilitating component assembly and easy connection between the motor body 302 and the test piece 206 to meet testing requirements. Furthermore, since both the test matching part 2 and the motor connecting part 3 are mounted on the test base plate 1, a suitable installation position can be selected according to the specifications of the motor body 302, adapting to various motor bodies 302. And because each motor body 302 is connected to a test piece 206, multiple motor bodies 302 can be tested simultaneously, improving testing accuracy and efficiency.

[0034] Preferably, such as Figure 1 As shown, in this embodiment, the test matching part 2 and the motor connection part 3 are arranged facing each other. To achieve the test connection, the connection position of the test matching part 2 and the mounting position of the motor connection part 3 must face each other. A receiving groove 4 is provided between the test matching part 2 and the motor connection part 3. Since the motor body 302 in this embodiment can be, for example, a guide rail motor, a counterweight 5 is used to simulate the actual movement of the guide rail motor. The counterweight 5 needs to be connected to the motor body 302; therefore, the receiving groove 4 provided between the test matching part 2 and the motor connection part 3 can be used to accommodate the counterweight 5.

[0035] Furthermore, such as Figure 1 As shown, in this embodiment, the motor connection part 3 may further include a counterweight 5, which is connected to the motor body 302 and used to assist in testing, enabling the motor body 302 to simulate real motion. The user can increase or decrease the number of counterweights 5 as needed. In this embodiment, each counterweight 5 weighs 100g and is fixed by stacking them with countersunk screws for easy installation and disassembly. The counterweight 5 is disposed in the receiving groove 4.

[0036] Preferably, such as Figure 1 and Figure 2As shown, in this embodiment, the test adjustment assembly may include a first fixing block 201, and the fixing assembly may include a second fixing block 301. Both the first fixing block 201 and the second fixing block 301 are disposed on the test base plate 1. Both the first fixing block 201 and the second fixing block 301 may have connecting holes, and are threadedly connected to the mounting holes of the test base plate 1 by connecting screws. The length of the first fixing block 201 and the length of the second fixing block 301 in the first direction S1 are the same as the length of the test base plate 1 in the first direction S1. To facilitate adaptation and assembly, both the first fixing block 201 and the second fixing block 301 may be formed as cuboid structures, and the length of the cuboid structure corresponds to the length of the test base plate 1.

[0037] Preferably, such as Figure 1 and Figure 2 As shown, in this embodiment, the test adjustment assembly may further include a slide rail 202 and a plurality of sliding blocks 203. The slide rail 202 is disposed on the first fixed block 201 along the first direction S1; the plurality of sliding blocks 203 are sequentially and spaced apart on the slide rail 202, and are slidably disposed on the slide rail 202. Each sliding block 203 has a connection position on its top. The slide rail 202 and the sliding blocks 203 can be common slide rail sliders. The sliding blocks 203 can slide on the slide rail 202, and each sliding block 203 has a connection position on its top for mounting the test piece 206. Thus, regardless of the different specifications of the motor body 302 or the different installation positions of each motor body 302, the position of the sliding blocks 203 on the slide rail 202 can be adjusted to make the test piece 206 fit with the motor body 302.

[0038] Preferably, such as Figures 1 to 3 As shown, in this embodiment, the test matching part 2 may further include a mounting assembly, which may include a connecting plate 204 and a connecting block 205. The test piece 206 is connected to the connecting position via the connecting plate 204, and the connecting wire of the test piece 206 passes through the connecting block 205 and connects to the motor body 302. The connecting plate 204 may be threadedly connected to the aforementioned sliding block 203. The connecting block 205 may be threadedly connected to the end of the connecting plate 204 facing the motor body 302 via screws or the like. The test piece 206 may be fixed to the connecting plate 204 via bolts, and the connecting wire of the test piece 206 may pass through the connecting block 205 to achieve electrical connection with the motor body 302. Preferably, the connecting block 205 may include an upper block and a lower block, with a through hole formed between the upper and lower blocks for the connecting wire of the test piece 206 to pass through. The upper and lower blocks are fixed using screws.

[0039] Preferably, such as Figure 2As shown, in this embodiment, the height of the second fixing block 301 is higher than the height of the first fixing block 201, and multiple mounting positions are sequentially and spaced apart on the top surface of the second fixing block 301. Since mounting components also need to be installed on the first fixing block 201, the height of the first fixing block 201 needs to be lower than the height of the second fixing block 301 in order to match the height of the second fixing block 301.

[0040] Preferably, such as Figure 4 As shown, in this embodiment, the fixing component may include multiple motor matching blocks, each corresponding to a different mounting position. As mentioned above, the motor body 302 may include various types of guide rail motors, such as right-rail motors, left-rail motors, and lower-rail motors. To accommodate these different motor specifications, motor matching blocks are specifically provided for mounting and fixing the motor body 302. These motor matching blocks are all mounted on the top of the second fixing block 301, and the motor body 302 is connected to the test piece 206 through these motor matching blocks.

[0041] Furthermore, in the embodiment, four different motor bodies 302 are shown, which can be a guide rail motor, a left guide rail motor, a lower guide rail motor, and a high-precision servo motor launched by Intime Company. These motors are... Figure 4 The installation sequence is from left to right. Therefore, in this embodiment, four corresponding motor matching blocks are provided: a first motor matching block 303, a second motor matching block 304, a third motor matching block 307, and a fourth motor matching block 308. These four motor matching blocks can all be formed as block structures with a bottom plate, and all four motor matching blocks are threadedly connected to the second fixing block 301 via the bottom plate. The differences between these motor matching blocks will be described below.

[0042] The first motor matching block 303 and the second motor matching block 304 can be used for mounting the right guide rail motor and the left guide rail motor, respectively. Therefore, the first motor matching block 303 and the second motor matching block 304 have a symmetrical structure. Thus, the limiting block portion 306 of the first motor matching block 303 is close to the limiting block portion 306 of the second motor matching block 304. Both the first motor matching block 303 and the second motor matching block 304 may include a fixing plate portion 305 and a limiting block portion 306. The fixing plate portion 305 is used to fix the motor body 302, and the limiting block portion 306 cooperates with the fixing plate portion 305 to clamp and limit the motor body 302. The fixing plate portion 305 and the limiting block portion 306 are both provided at one end of the motor matching block body facing the test matching portion 2 to facilitate the fixing of the motor body 302 and the connection with the test piece 206.

[0043] The third motor matching block 307 may include an extension 309. The third motor matching block 307 can be used for the installation of the lower guide rail motor. Since the guide rail of the lower guide rail motor is located at the bottom of the motor, sufficient installation space needs to be reserved. Therefore, the extension 309 extends upward from the top surface of the third motor matching block 307, and the motor body 302 is disposed on the extension 309.

[0044] The fourth motor matching block 308 may include a clamping part 310. The fourth motor matching block 308 can be used to install a high-precision servo motor launched by Intime Company. In order to enable this motor to be installed, the fourth motor matching block 308 is provided with a clamping part 310. A clamping space is formed between the clamping part 310 and the top surface of the fourth motor matching block 308, and the motor body 302 is disposed in the clamping space.

[0045] However, this is not the only limitation. The embodiments only provide these few assembly and connection methods for the motor body 302. Users can also select more suitable motor matching blocks to match motor bodies 302 of different specifications as needed. It should be noted that the motor matching block must be able to be installed on the second fixing block 301 via a threaded connection. Furthermore, the lengths of the first fixing block 201 and the second fixing block 301 can be increased to provide more connection and installation positions, enabling simultaneous testing of a larger number of motors.

[0046] The assembly method of this test fixture applicable to various single motor accuracies is as follows: First, the test base plate 1 is installed on a horizontal platform or test bench. Then, the first fixing block 201 and the second fixing block 301 are fixed to the test base plate 1 by threaded connection. During the fixing process, an appropriate spacing (i.e., the appropriate width of the receiving groove 4) needs to be selected according to the specifications of the motor body 302. The slide rail 202 is installed on the first fixing block 201 by threaded connection, and then four sliding blocks 203 are installed on the slide rail 202. Test pieces 206, such as dial indicators, are installed on the four sliding blocks 203 respectively. The electrical connection wires of the test pieces 206 can pass through the connecting block 205. On the upper part of the second fixing block 301, the first motor matching block 303, the second motor matching block 304, the third motor matching block 307, and the fourth motor matching block 308 are installed by threaded connection. Then, the motor body 302 is installed on the corresponding motor matching block according to the specifications of the motor body 302. After connecting the power cords of the motor bodies 302 of different specifications to the power supply, the motors can drive the guide rails to move, allowing four dial indicators to simultaneously measure the accuracy of four different motors. To test the accuracy of multiple individual motors after adding the counterweight 5, the counterweight 5 can be installed on the guide rail surface of the motor body 302 via a threaded connection, and the power cord can be connected for testing.

[0047] This test fixture, applicable to various single-motor precision requirements, enables precision testing of motors of different specifications through the cooperation of a test base plate, a test matching part, and a motor connection part. The overall structure of this test fixture is simple, facilitating component assembly and easy connection between the motor body and the test piece to meet testing requirements. Furthermore, since both the test matching part and the motor connection part are mounted on the test base plate, appropriate installation positions can be selected according to the specifications of the motor body, adapting to various motor bodies. And because each motor body is connected to a test piece, multiple motor bodies can be tested simultaneously, improving testing accuracy and efficiency.

[0048] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A testing fixture suitable for various single motor accuracies, characterized in that, The test fixture applicable to various single motor accuracies includes a test base plate, a test matching part, and a motor connection part, wherein the test matching part is connected to the motor connection part; The test matching section includes a test adjustment component, multiple connection positions, and multiple test pieces. The multiple connection positions are mounted on the test base plate via the test adjustment component, and each connection position is equipped with one test piece. The motor connection part includes a fixing component and multiple mounting positions. The multiple mounting positions are mounted on the test base plate through the fixing component, and each mounting position is equipped with a motor body.

2. The testing fixture applicable to various single motor accuracies according to claim 1, characterized in that, The test matching part and the motor connection part are arranged facing each other. A receiving groove is provided between the test matching part and the motor connection part.

3. The testing fixture applicable to various single motor accuracies according to claim 1, characterized in that, The test adjustment component includes a first fixing block, and the fixing component includes a second fixing block, both the first fixing block and the second fixing block being disposed on the test base plate; The lengths of the first fixing block and the second fixing block in the first direction are the same as the length of the test base plate in the first direction.

4. The testing fixture applicable to various single motor accuracies according to claim 3, characterized in that, The test adjustment assembly further includes a slide rail and a plurality of sliding blocks. The slide rail is disposed on the first fixed block along the first direction. The plurality of sliding blocks are disposed sequentially and spaced apart from the slide rail. The plurality of sliding blocks are slidably disposed on the slide rail. Each sliding block has a connection position on its top.

5. The testing fixture applicable to various single motor accuracies according to claim 1, characterized in that, The test matching part also includes an installation component, which includes a connecting plate and a connecting block. The test piece is connected to the connecting position through the connecting plate, and the connecting wire of the test piece passes through the connecting block and is connected to the motor body.

6. The testing fixture applicable to various single motor accuracies according to claim 3, characterized in that, The height of the second fixing block is higher than that of the first fixing block, and the plurality of mounting positions are arranged sequentially and at intervals on the top surface of the second fixing block.

7. The testing fixture applicable to various single motor accuracies according to claim 1, characterized in that, The fixing component includes multiple motor matching blocks, and each of the multiple motor matching blocks is configured to correspond one-to-one with a multiple mounting positions.

8. The testing fixture applicable to various single motor accuracies according to claim 7, characterized in that, The plurality of motor matching blocks include a first motor matching block and a second motor matching block. Both the first motor matching block and the second motor matching block include a fixing plate portion and a limiting block portion. The fixing plate portion and the limiting block portion are both disposed at one end of the motor matching block facing the test matching portion. The limiting block portion of the first motor matching block is close to the limiting block portion of the second motor matching block.

9. The testing fixture applicable to various single motor accuracies according to claim 7, characterized in that, The plurality of motor matching blocks further includes a third motor matching block and a fourth motor matching block. The third motor matching block includes an extension that extends upward from the top surface of the third motor matching block, and the motor body is disposed on the extension. The fourth motor matching block includes a clamping part, and a clamping space is formed between the clamping part and the top surface of the fourth motor matching block, and the motor body is disposed in the clamping space.

10. The testing fixture applicable to various single motor accuracies according to claim 2, characterized in that, The motor connection part also includes a counterweight block, which is connected to the motor body and is disposed in the receiving groove.

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