Lifting drive mechanism of pressure regulating device

Abstract

The utility model provides a kind of lifting transmission mechanism of pressure regulating device, comprising: clamping plate assembly;Motor is installed on the clamping plate assembly;Lead screw piece, the output shaft of the motor is connected with the lead screw piece by elastic coupling, spiral cut is equipped on the outer circumferential surface of the elastic coupling;Carbon brush mounting plate is connected with the lead screw piece by lead screw nut.This lifting transmission mechanism of pressure regulating device, spiral cut is equipped on the outer circumferential surface of the elastic coupling, which makes the elastic coupling be the transmission device with elastic deformation function, the output shaft of the motor is connected with the lead screw piece by elastic coupling, and elastic coupling can absorb the slight deviation and slight displacement generated in the installation of the output shaft of the motor and lead screw piece;The lifting transmission mechanism solves the problem that the output shaft of the existing motor and lead screw piece are rigidly connected and cannot compensate for slight deviation, and avoids radial vibration caused by centrifugal force when the motor rotates.

Description

Technical Field

[0001] This utility model relates to the field of voltage stabilizer or voltage regulator technology, and in particular to a lifting transmission mechanism for a voltage regulating device. Background Technology

[0002] In the current industry, voltage regulators or voltage stabilizers have voltage regulating devices. In the lifting transmission mechanism of these devices, a motor is typically directly connected to a lead screw, which drives the carbon brush mounting plate to move up and down. Because the motor's output shaft and the lead screw are rigidly connected, a slight deviation between the lead screw's central axis and the motor's output shaft during assembly can cause centrifugal force and radial vibration when the motor rotates. This can lead to the carbon brush mounting plate swaying, resulting in poor contact between the carbon brushes and the coil. Designing a lifting transmission mechanism that can absorb the slight deviations and displacements generated during the installation of the motor's output shaft and the lead screw is a problem that needs to be solved by those skilled in the art. Utility Model Content

[0003] The purpose of this utility model is to provide a lifting transmission mechanism for a pressure regulating device, which can absorb the small deviations and small displacements generated during the installation of the motor output shaft and the lead screw.

[0004] To solve the above-mentioned technical problems, this utility model provides a lifting transmission mechanism for a pressure regulating device, comprising:

[0005] Clamping assembly;

[0006] The motor is mounted on the clamping plate assembly;

[0007] The output shaft of the motor is connected to the lead screw via a flexible coupling, and the outer circumferential surface of the flexible coupling is provided with a helical cut.

[0008] The carbon brush mounting plate is connected to the lead screw via a nut on the lead screw section.

[0009] Preferably, the flexible coupling is provided with an axial connection hole, and the side wall of the flexible coupling is provided with an upper mounting hole and a lower mounting hole;

[0010] The axial connection hole is for the motor's output shaft and the lead screw to be inserted;

[0011] A first fixing component is installed in the upper mounting hole, and the output shaft of the motor is fixed at the end of the first fixing component; a second fixing component is installed in the lower mounting hole, and the lead screw is fixed at the end of the second fixing component.

[0012] Preferably, the lifting transmission mechanism of the pressure regulating device further includes a fixed seat, which is respectively disposed at the upper and lower parts of the clamping plate assembly; the upper end of the lead screw passes through the fixed seat located at the upper part of the clamping plate assembly, and the lower end of the lead screw passes into the fixed seat located at the lower part of the clamping plate assembly.

[0013] Furthermore, the fixed seat has a built-in seat bearing, and the lead screw is fitted into the seat bearing.

[0014] Preferably, the lead screw is a ball screw, the nut on the lead screw is a flange-type ball nut, and balls are provided between the flange-type ball nut and the ball screw.

[0015] Preferably, the lifting transmission mechanism of the pressure regulating device further includes two guide posts, each of which is disposed on the clamping plate assembly and is parallel to the lead screw; a bushing is respectively installed at both ends of the carbon brush mounting plate, and each bushing is sleeved on the corresponding guide post.

[0016] Furthermore, the clamping plate assembly is also provided with an upper column mounting hole and a lower column mounting hole for installing the guide post; the central axis of the upper column mounting hole and the central axis of the lower column mounting hole are on the same straight line.

[0017] Preferably, the clamping plate assembly includes an upper plate, a side plate, and a lower plate connected sequentially from top to bottom.

[0018] Preferably, the clamping plate assembly consists of an upper plate and a lower plate.

[0019] Furthermore, the carbon brush mounting plate is provided with a nut mounting hole for the lead screw to pass through, and the two ends of the carbon brush mounting plate are respectively provided with sleeve mounting holes for the bushing to pass through; on the upper mounting surface of the carbon brush mounting plate, the center points of the two sleeve mounting holes are on the same straight line, and the center points of the two sleeve mounting holes and the center point of the nut mounting hole are not on the same straight line.

[0020] The lifting transmission mechanism of the pressure regulating device of this utility model has the following beneficial effects:

[0021] In the lifting transmission mechanism of the pressure regulating device in this embodiment, the outer circumferential surface of the flexible coupling is provided with a helical cut, which makes the flexible coupling a transmission device with elastic deformation function. The output shaft of the motor and the lead screw are connected through the flexible coupling. When the motor is working, the output shaft of the motor drives the lead screw to rotate through the flexible coupling, so that the lead screw drives the carbon brush mounting plate to rise and fall through the lead screw nut. The flexible coupling can absorb the small deviations and small displacements generated during the installation of the motor output shaft and the lead screw. This lifting transmission mechanism solves the problem that the existing rigid connection between the motor output shaft and the lead screw cannot compensate for small deviations, and avoids the radial vibration caused by centrifugal force when the motor rotates, which causes the carbon brush mounting plate to sway. Therefore, this lifting transmission mechanism can avoid the situation of poor contact between the carbon brush and the coil. Attached Figure Description

[0022] Figure 1 The diagram shows a three-dimensional structure of the lifting transmission mechanism with a voltage regulating coil installed as shown in Example 1.

[0023] Figure 2 Displayed as Figure 1 An enlarged structural diagram of point A.

[0024] Figure 3 The diagram shows a front view of the lifting transmission mechanism with a voltage regulating coil installed as shown in Example 1.

[0025] Figure 4 The diagram shown is a three-dimensional structural schematic of the lifting transmission mechanism of Example 1.

[0026] Figure 5 The diagram shown is a three-dimensional structural schematic of the clamp assembly of Embodiment 1.

[0027] Figure 6 The diagram shown is a three-dimensional structural schematic of the flexible coupling of Example 1.

[0028] Figure 7 The diagram shown is a side view of the flexible coupling of Example 1.

[0029] Figure 8 The diagram shown is a structural schematic of the carbon brush mounting plate of Example 1.

[0030] Figure 9 The diagram shows the internal structure of the motor output shaft and the lead screw connected by a flexible coupling, as shown in Example 1.

[0031] Figure 10 The diagram shown is a structural schematic of the carbon brush mounting plate of Example 3.

[0032] Figure 11 This is a schematic diagram showing the structure of the carbon brush mounting plate shown in Example 4, with a nut mounting hole located to the right of the sleeve mounting hole on the right side.

[0033] Figure 12 This is a schematic diagram showing the structure of the carbon brush mounting plate shown in Example 4, with a nut mounting hole located to the left of the sleeve mounting hole on the left side.

[0034] Figure 13 The diagram shown is a structural schematic of the upper plate of Example 2.

[0035] Figure 14 The diagram shown is a structural schematic of the lower plate of Example 2.

[0036] Explanation of icon numbers

[0037] 100. Clamping plate assembly; 101. Upper fixing surface; 102. Upper column mounting hole; 103. Lower fixing surface; 104. Lower column mounting hole; 110. Upper plate; 111. Base mounting hole; 112. Lead screw through hole; 120. Side plate; 121. Limit switch mounting hole; 122. Core mounting hole; 130. Lower plate; 131. Transformer fixing mounting hole; 140. Upper plate; 150. Lower plate;

[0038] 200. Motor; 210. Motor mounting plate;

[0039] 300. Lead screw components;

[0040] 400, Flexible coupling; 410, Spiral notch; 420, Axial connection hole; 430, Upper mounting hole; 440, Lower mounting hole;

[0041] 500. Carbon brush mounting plate; 510. Bushing; 520. Upper mounting surface; 530. Nut mounting hole; 540. Sleeve mounting hole; 550. Limit switch stop plate mounting hole; 560. Carbon brush assembly mounting hole; 570. Carbon brush wire fixing bracket mounting hole;

[0042] 600. Nut on the lead screw section;

[0043] 710. Fastener 1; 720. Fastener 2;

[0044] 800. Fixed base; 810. Base bearing

[0045] 900, guide post. Detailed Implementation

[0046] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0047] Please refer to the accompanying drawings. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0048] Example 1

[0049] like Figures 1 to 9 As shown, the lifting transmission mechanism of the pressure regulating device in this embodiment includes:

[0050] Clamping assembly 100;

[0051] Motor 200 is mounted on clamp assembly 100;

[0052] The output shaft of the motor 200 is connected to the lead screw 300 via a flexible coupling 400. The outer circumferential surface of the flexible coupling 400 is provided with a spiral cut 410.

[0053] The carbon brush mounting plate 500 is connected to the lead screw component 300 via the lead screw nut 600.

[0054] In the lifting transmission mechanism of the pressure regulating device in this embodiment, the outer circumferential surface of the flexible coupling 400 is provided with a spiral cut 410, which makes the flexible coupling 400 a transmission device with elastic deformation function. The output shaft of the motor 200 and the lead screw 300 are connected through the flexible coupling 400. When the motor 200 is working, the output shaft of the motor 200 drives the lead screw 300 to rotate through the flexible coupling 400, so that the lead screw 300 drives the carbon brush mounting plate 500 to rise and fall through the lead screw nut 600. Thus, the flexible coupling 400 can absorb the small deviations and small displacements generated during the installation of the output shaft of the motor 200 and the lead screw 300. This lifting transmission mechanism solves the problem that the existing rigid connection between the output shaft of the motor 200 and the lead screw 300 cannot compensate for small deviations, and avoids the radial vibration caused by the centrifugal force generated when the motor 200 rotates, which causes the carbon brush mounting plate 500 to sway. Thus, this lifting transmission mechanism can avoid the situation of poor contact between the carbon brush and the coil.

[0055] The flexible coupling 400 is provided with an axial connection hole 420, and the side wall of the flexible coupling 400 is provided with an upper mounting hole 430 and a lower mounting hole 440. The axial connection hole 420 is into which the output shaft of the motor 200 and the lead screw 300 are inserted. A fixing member 710 is installed in the upper mounting hole 430, and the end of the fixing member 710 fixes the output shaft of the motor 200. A fixing member 720 is installed in the lower mounting hole 440, and the end of the fixing member 720 fixes the lead screw 300. This arrangement allows the flexible coupling 400 to stably connect the output shaft of the motor 200 and the lead screw 300 together.

[0056] like Figure 6 , Figure 7 and Figure 9 As shown, in this embodiment, the output shaft of the motor 200 is tightly fitted with the axial connection hole 420, and the lead screw 300 is also tightly fitted with the axial connection hole 420. This facilitates the flexible coupling 400 in stably connecting the output shaft of the motor 200 and the lead screw 300 together. Both the first fixing member 710 and the second fixing member 720 are fastening screws with external threads; the upper mounting hole 430 and the lower mounting hole 440 are threaded holes; the first fixing member 710 is threadedly connected to the upper mounting hole 430, and the end of the first fixing member 710 presses against the outer surface of the output shaft of the motor 200, thus securing the flexible coupling 400 to the output shaft of the motor 200. The second fixing member 720 is threadedly connected to the lower mounting hole 440, and the end of the second fixing member 720 presses against the outer surface of the lead screw 300, thus securing the flexible coupling 400 to the lead screw 300. To enhance the clamping force exerted by the first fixing member 710 on the output shaft of the motor 200 and the clamping force exerted by the second fixing member 720 on the lead screw 300, multiple upper mounting holes 430 and lower mounting holes 440 can be provided, as can multiple fixing members 710 and 720. The number of fixing members 710 and 720 is the same as the number of corresponding upper mounting holes 430 and lower mounting holes 440, respectively. Specifically, in this embodiment, two upper mounting holes 430 and two lower mounting holes 440 are provided, as are two fixing members 710 and 720. Both fixing members 710 abut against the output shaft of the motor 200, and both fixing members 720 abut against the lead screw 300. For ease of manufacturing, the flexible coupling 400 is made of aluminum alloy.

[0057] like Figures 1 to 9 As shown, the slit width W of the helical slit 410 ranges from 0.4 to 0.6 mm, and the pitch P of the helical slit 410 is 1.5 to 3 mm. In this embodiment, the slit width W of the helical slit 410 is 0.5 mm, and the pitch P of the helical slit 410 is 2 mm.

[0058] Because the existing lead screw is too long and suspended without a fixed mounting, it will flex and deform and move axially during motor rotation, causing the carbon brush mounting plate 500 to move as well, resulting in poor contact between the carbon brush and the coil. The lifting transmission mechanism of the voltage regulating device in this embodiment also includes fixed seats 800, which are respectively located at the upper and lower parts of the clamping plate assembly 100. The upper end of the lead screw 300 passes through the fixed seat 800 located at the upper part of the clamping plate assembly 100, and the lower end of the lead screw 300 passes into the fixed seat 800 located at the lower part of the clamping plate assembly 100. In this embodiment, there are two fixed seats 800. Using two fixed seats 800 to fix both ends of the lead screw 300 respectively solves the problem of the lead screw 300 being suspended, and can prevent the lead screw 300 from flexing and deforming and moving axially when the motor 200 rotates.

[0059] The fixed base 800 has a built-in seat bearing 810, and the lead screw 300 is fitted into the seat bearing 810. The seat bearing 810 can support the rotating lead screw 300, and when the lead screw 300 rotates, the seat bearing 810 built into the fixed base 800 rotates. The two fixed bases 800 are connected to the clamping plate assembly 100 by screws.

[0060] Existing lifting transmission mechanisms suffer from drawbacks due to the trapezoidal threads on the lead screw components, which are prone to wear, have long assembly times, and high labor and material costs. These drawbacks include high noise levels and the need for regular maintenance. In this embodiment, the lead screw component 300 is a ball screw, and the nut 600 is a flange-type ball nut with balls between it and the ball screw. The flange-type ball nut achieves lifting and lowering by the rolling of the balls within the threaded grooves on the ball screw. The carbon brush mounting plate 500 is connected to the flange-type ball nut with screws, and its movement during lifting and lowering drives the carbon brush mounting plate 500 to move up and down. This structure using a ball screw and flange-type ball nut solves the problems of easy wear, high noise, and frequent maintenance associated with the trapezoidal lead screw component 300, resulting in a longer service life and maintenance-free operation of the ball screw.

[0061] The lifting transmission mechanism of the pressure regulating device also includes two guide posts 900, both of which are mounted on the clamping plate assembly 100 and parallel to the lead screw 300. A bushing 510 is mounted at each end of the carbon brush mounting plate 500, with each bushing 510 fitted onto the corresponding guide post 900. The guide posts 900 serve a guiding function; when the carbon brush mounting plate 500 is raised or lowered, the bushing 510 can only move on the guide post 900, meaning the lead screw 300 can stably drive the carbon brush mounting plate 500 to move vertically. In this embodiment, the bushing 510 is mounted on the carbon brush mounting plate 500 by screws; the bushing 510 is a flanged linear bushing 510.

[0062] The clamping plate assembly 100 includes an upper plate 110, a side plate 120, and a lower plate 130 connected sequentially from top to bottom. The upper plate 110 has an upper column mounting hole 102 for mounting the upper end of the guide post 900, and the lower plate 130 has a lower column mounting hole 104 for mounting the lower end of the guide post 900. The central axis of the upper column mounting hole 102 and the central axis of the lower column mounting hole 104 are on the same straight line, and the central axis of the upper column mounting hole 102 is vertically arranged.

[0063] Since the upper mounting surface 520 of the carbon brush mounting plate 500 is horizontally set, the guide post 900 is installed on the upper post mounting hole 102 and the lower post mounting hole 104. The upper mounting surface 520 of the carbon brush mounting plate 500 is perpendicular to the central axis of the guide post 900, so that the guide post 900 can maintain a vertical setting after installation.

[0064] In this embodiment, the upper plate 110 has an upper fixing surface 101, and the lower plate 130 has a lower fixing surface 103. An upper column mounting hole 102 is located on the upper fixing surface 101, and a lower column mounting hole 104 is located on the lower fixing surface 103. The central axis of the guide post 900 is perpendicular to the upper fixing surface 101, and the central axis of the guide post 900 is perpendicular to the lower fixing surface 103 of the clamping plate assembly 100, ensuring that both the upper fixing surface 101 and the lower fixing surface 103 can be stably connected to the guide post 900. The guide post 900 is fixed to the clamping plate assembly 100 by bolts.

[0065] The clamping plate assembly 100 is an integral structure. The upper column mounting hole 102 and the lower column mounting hole 104 on the same side of the clamping plate assembly 100 are aligned vertically. This can prevent the upper column mounting hole 102 and the lower column mounting hole 104 from shifting left and right, thus avoiding the problem of tilting after the guide post 900 is installed.

[0066] The motor 200 is mounted on the motor mounting plate 210. To fix the position of the motor 200, the motor mounting plate 210 is mounted on the upper plate 110 with screws. In this embodiment, both the upper plate 110 and the lower plate 130 are provided with mounting holes 111 for mounting the fixing seat 800. The voltage regulating device also includes a limit switch, an iron core, and a transformer. To install the limit switch, iron core, and transformer, the side plate 120 is provided with a limit switch mounting hole 121 and an iron core mounting hole 122, and the lower plate 130 is provided with a transformer fixing mounting hole 131.

[0067] like Figure 4 , Figure 5 and Figure 8As shown, the carbon brush mounting plate 500 has a nut mounting hole 530 for the lead screw 300 to pass through, and sleeve mounting holes 540 for the bushing 510 to pass through at both ends of the carbon brush mounting plate 500. On the upper mounting surface 520 of the carbon brush mounting plate 500, the center points of the two sleeve mounting holes 540 are on the same straight line, but the center points of the two sleeve mounting holes 540 and the center point of the nut mounting hole 530 are not on the same straight line. This structure is beneficial to the stability of the carbon brush mounting plate 500 during the lifting process. The central axis of the upper column mounting hole 102, the central axis of the sleeve mounting hole 540, and the central axis of the lower column mounting hole 104 are collinear to ensure that the guide post 900 is perpendicular to the clamping plate assembly 100. The clamping plate assembly 100 also has a lead screw through hole 112, and the central axis of the lead screw through hole 112 is collinear with the central axis of the nut mounting hole 530 to ensure that the lead screw 300 remains in a vertical position after installation.

[0068] To install limit switch baffles, carbon brush assemblies, and carbon brush wire fixing brackets, the carbon brush mounting plate 500 is provided with limit switch baffle mounting holes 550, three sets of carbon brush assembly mounting holes 560, and carbon brush wire fixing bracket mounting holes 570.

[0069] To make the structure more compact, the nut mounting hole 530 is located between the two sleeve mounting holes 540, with the nut mounting hole 530 being closer to the sleeve mounting hole 540 on the right side.

[0070] Example 2

[0071] like Figures 13 to 14 As shown, to facilitate the processing of the clamping plate assembly 100, the difference between this embodiment and Embodiment 1 is that the clamping plate assembly 100 consists of an upper plate 140 and a lower plate 150; the upper plate 140 has an upper fixing surface 101, and the lower plate 150 has a lower fixing surface 103. An upper column mounting hole 102 is provided on the upper plate 140, and a lower column mounting hole 104 is provided on the lower plate 150.

[0072] Example 3

[0073] like Figure 10 As shown, the difference between this embodiment and embodiment 1 is that, in order to avoid the lead screw 300 from hitting the carbon brush under certain working conditions, the nut mounting hole 530 is closer to the sleeve mounting hole 540 on the left side.

[0074] Example 4

[0075] like Figure 11 and Figure 12As shown, the difference between this embodiment and Embodiment 1 is that when there are many wires, in order to leave room for wire installation, the nut mounting hole 530 is set on the outside of the sleeve mounting hole 540. Specifically, the nut mounting hole 530 is set on the right side of the right sleeve mounting hole 540, or the nut mounting hole 530 is set on the left side of the left sleeve mounting hole 540, that is, no nut mounting hole 530 is set between the two sleeve mounting holes 540.

[0076] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0077] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A lifting transmission mechanism for a pressure regulating device, characterized in that, include: Clamping assembly (100); A motor (200) is mounted on the clamp assembly (100); A lead screw assembly (300) is provided, wherein the output shaft of the motor (200) is connected to the lead screw assembly (300) via an elastic coupling (400), and the outer circumferential surface of the elastic coupling (400) is provided with a helical cut (410); The carbon brush mounting plate (500) is connected to the lead screw (300) via a lead screw nut (600).

2. The lifting transmission mechanism of the pressure regulating device according to claim 1, characterized in that: The flexible coupling (400) is provided with an axial connection hole (420), and the side wall of the flexible coupling (400) is provided with an upper mounting hole (430) and a lower mounting hole (440). The axial connection hole (420) is for the output shaft of the motor (200) and the lead screw (300) to be inserted; A first fixing member (710) is installed in the upper mounting hole (430), and the output shaft of the motor (200) is fixed at the end of the first fixing member (710); a second fixing member (720) is installed in the lower mounting hole (440), and the lead screw (300) is fixed at the end of the second fixing member (720).

3. The lifting transmission mechanism of the pressure regulating device according to claim 1, characterized in that: It also includes a fixing seat (800), which is respectively disposed on the upper part and the lower part of the clamping plate assembly (100); the upper end of the lead screw (300) passes through the fixing seat (800) located on the upper part of the clamping plate assembly (100), and the lower end of the lead screw (300) passes into the fixing seat (800) located on the lower part of the clamping plate assembly (100).

4. The lifting transmission mechanism of the pressure regulating device according to claim 3, characterized in that: The fixed seat (800) has a built-in seat bearing (810), and the lead screw (300) is fitted into the seat bearing (810).

5. The lifting transmission mechanism of the pressure regulating device according to claim 1, characterized in that: The lead screw component (300) is a ball screw, and the lead screw nut (600) is a flange-type ball nut, with balls provided between the flange-type ball nut and the ball screw.

6. The lifting transmission mechanism of the pressure regulating device according to claim 1, characterized in that: It also includes a guide post (900) disposed on the clamping plate assembly (100) and parallel to the lead screw (300); a bushing (510) is respectively installed at both ends of the carbon brush mounting plate (500), and each bushing (510) is sleeved on the corresponding guide post (900).

7. The lifting transmission mechanism of the pressure regulating device according to claim 6, characterized in that: The clamping plate assembly (100) is also provided with an upper column mounting hole (102) and a lower column mounting hole (104) for mounting the guide post (900); the central axis of the upper column mounting hole (102) and the central axis of the lower column mounting hole (104) are on the same straight line.

8. The lifting transmission mechanism of the pressure regulating device according to claim 1, characterized in that: The clamping plate assembly (100) includes an upper plate (110), a side plate (120), and a lower plate (130) connected sequentially from top to bottom.

9. The lifting transmission mechanism of the pressure regulating device according to claim 1, characterized in that: The clamping plate assembly (100) consists of an upper plate (140) and a lower plate (150).

10. The lifting transmission mechanism of the pressure regulating device according to claim 6, characterized in that: The carbon brush mounting plate (500) is provided with a nut mounting hole (530) for the lead screw (300) to pass through. The two ends of the carbon brush mounting plate (500) are respectively provided with sleeve mounting holes (540) for the bushing (510) to pass through. On the upper mounting surface (520) of the carbon brush mounting plate (500), the center points of the two sleeve mounting holes (540) are on the same straight line, and the center points of the two sleeve mounting holes (540) and the center point of the nut mounting hole (530) are not on the same straight line.

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