A brush pre-wearing device

Abstract

The application relates to the technical field of brush production, in particular to a brush pre-grinding device which comprises a grinding brush wheel and a base frame; the base frame comprises an upper ring body and a lower ring body which are arranged in an upper-lower interval, and the upper ring body and the lower ring body are connected through a plurality of connecting rods; a bottom cover is installed on the bottom surface of the lower ring body; the upper shaft neck of the top surface of the grinding brush wheel is installed in the central hole of the upper ring body through an upper bearing, and the lower shaft neck of the bottom surface of the grinding brush wheel is installed in the central hole of the bottom cover through a lower bearing; a plurality of grinding brush sleeves are uniformly distributed on the bottom surface of the upper ring body in a ring shape; a brush mounting hole is arranged on the grinding brush sleeve and used for slidingly mounting a to-be-ground brush; a plurality of pushing devices are uniformly distributed on the top surface of the lower ring body in a ring shape and used for radially pushing the to-be-ground brush to abut against the outer circumferential surface of the grinding brush wheel; the bottom surface of the lower shaft neck is integrally formed with a connecting shaft which is downwardly led out from the bottom cover and used for being connected with the output shaft of a driving motor. The pushing device can provide pre-pressure for the to-be-ground brush, and is favorable for guaranteeing the pre-grinding effect.

Description

Technical Field

[0001] This invention relates to the field of brush manufacturing technology, and in particular to a brush pre-grinding device. Background Technology

[0002] The brush is a crucial component of a brushed motor, serving as the conductive part that drives the motor's rotation. For proper operation, the surface of the brush that contacts the commutator must be an arc surface that matches the commutator's arc. However, the brush end face is typically flat. Directly running-in the brush on the entire machine (electrical running-in) is inefficient, wasteful of resources, and can damage the rotor commutator surface. Therefore, the brushes need to be pre-ground to achieve an arc shape, requiring a pre-grinding device.

[0003] In the prior art, for example, patent CN206225765U discloses a brush pre-grinding device. In use, all brushes are installed in the brush holder according to the motor's number of stages (the stage corresponds to the number of brush groups). The brush wheel is rotated by turning the handle to pre-grind the brushes. After several rotations, the brushes are removed to check if the friction surface meets the requirements. If it does, all brushes can be removed for the next group of brushes to be pre-grinded. If it does not meet the requirements, the brushes are reinstalled and pre-grinding continues until the requirements are met. Another example is patent CN209021824U, which discloses a brush pre-grinding device where a motor drives a grinding wheel via a shaft. The grinding wheel pre-grinds the brushes on its outer side. Because the cross-sectional shape of the holder is arc-shaped, the upper half of the grinding wheel can be used to place brushes, allowing this invention to pre-grind multiple brushes simultaneously.

[0004] However, in the aforementioned prior art brush pre-grinding devices, the brushes to be ground are kept in contact with the grinding wheel under their own weight during pre-grinding. However, due to the relatively small weight of the brushes, relying solely on their own weight during the grinding process is insufficient to ensure tight contact between the brush and the grinding wheel, thus compromising the pre-grinding effect. Furthermore, the lack of control over the amount of material removed from the pre-grinding brushes leads to uneven removal, resulting in brushes of varying lengths after pre-grinding, affecting brush consistency, motor performance, and service life. Summary of the Invention

[0005] The main objective of this invention is to provide a brush pre-grinding device to solve the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention proposes a brush pre-grinding device, comprising a brush wheel and a base frame; the base frame includes an upper ring body and a lower ring body spaced apart vertically, and the upper ring body and the lower ring body are connected by multiple connecting rods; a bottom cover is installed on the bottom surface of the lower ring body; the upper journal of the brush wheel is mounted in the center hole of the upper ring body through an upper bearing, and the lower journal of the brush wheel is mounted in the center hole of the bottom cover through a lower bearing; multiple brush sleeves are evenly distributed in a ring on the bottom surface of the upper ring body; brush mounting holes are provided on the brush sleeves for slidingly mounting the brush to be ground; multiple pushing devices are evenly distributed in a ring on the top surface of the lower ring body for radially pushing the brush to be ground against the outer circumferential surface of the brush wheel; a connecting shaft is integrally formed on the bottom surface of the lower journal, and the connecting shaft extends downward from the bottom cover for connecting with the output shaft of the drive motor.

[0007] Preferably, the brush sleeve has two brush mounting holes, which are arranged vertically.

[0008] Preferably, the bottom surface of the upper ring body has multiple positioning grooves evenly distributed in a ring, and the positioning grooves are arranged radially; a positioning protrusion is provided on the top surface of the brush sleeve; the positioning protrusion is fitted into the positioning groove, and the upper ring body and the brush sleeve are fastened together by a first screw, and the first screw passes through the upper ring body from top to bottom and is screwed onto the top surface of the brush sleeve.

[0009] Preferably, a recessed groove is provided on the top surface of the bottom cover.

[0010] Preferably, the pushing device includes a base and a push block; the base includes a base plate, an integrally formed mounting block on the top surface of the base plate, and a baffle; the baffle is located on the top surface of the outer end of the base plate, and a U-shaped opening is provided on the baffle; the push block is slidably inserted into the rectangular hole of the mounting block; the inner end of the push block abuts against the end face of the brush to be ground; the pushing device also includes a power source for providing radial force to the push block.

[0011] Preferably, the power source is a spring; a pull rod is provided on the end face of the outer end of the push block, and the outer end of the pull rod protrudes from the U-shaped opening; a handle is inserted laterally into the end of the outer end of the pull rod; the spring is sleeved on the pull rod, and the inner end of the spring abuts against the push block, and the outer end of the spring abuts against the baffle; the spring is always in a compressed and energy-storing state.

[0012] Optionally, the power source is a cylinder; the cylinder is mounted on the baffle; the telescopic rod of the cylinder passes through the U-shaped opening and connects to the push block.

[0013] Preferably, the base, lower ring, and bottom cover are fastened together by a second screw; the second screw passes through the base plate and lower ring from top to bottom and is then screwed onto the bottom cover.

[0014] Preferably, a U-shaped limiting groove is provided on the push block, and the opening of the U-shaped limiting groove faces the brush wheel; a limiting pin is inserted laterally on the mounting block; the limiting pin extends into the limiting groove.

[0015] Preferably, the upper ring body, lower ring body, and connecting rod are integrally formed structures, and two adjacent connecting rods together with the upper ring body and lower ring body form an electric brush grinding port; a grinding brush sleeve is provided at each electric brush grinding port; and a pushing device is provided for each grinding brush sleeve.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0017] (1) In this invention, multiple pushing devices are evenly distributed on the top surface of the lower ring body to radially push the brush to be ground against the outer circumferential surface of the grinding wheel. During grinding, the pushing devices can provide pre-pressure for the brush to be ground, so that the brush to be ground can always be against the grinding wheel for grinding, which helps to ensure the pre-grinding effect.

[0018] (2) The device provided by the present invention has a simple structure and strong versatility. The brushes processed by the device can improve the efficiency, pass rate and consistency of brush pre-grinding.

[0019] (3) The device provided by the present invention forms a mechanical limiting mechanism under the combined action of the limiting pin and the limiting groove on the push block, which can ensure the consistency of the amount removed and the consistency of the brush length after pre-grinding. It avoids the problems of excessive brush removal affecting the lifespan and inconsistent removal leading to large performance dispersion caused by the prior art. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is an exploded view of the brush pre-grinding device in Embodiment 1 of the present invention;

[0022] Figure 2 This is an overall structural diagram of the brush pre-grinding device in Embodiment 1 of the present invention;

[0023] Figure 3This is a three-dimensional structural diagram of the base frame in this invention;

[0024] Figure 4 This is a three-dimensional structural diagram of the brush sleeve in this invention;

[0025] Figure 5 This is a three-dimensional structural diagram of the base in this invention;

[0026] Figure 6 This is a schematic diagram of the pull rod and push block engaging in the first embodiment of the present invention;

[0027] Figure 7 This is an overall structural diagram of the brush pre-grinding device in Embodiment 2 of the present invention;

[0028] Figure 8 This is a diagram showing the usage state of the brush pre-grinding device provided by the present invention.

[0029] Reference numerals: 1. Grinding brush wheel; 1a. Upper journal; 1b. Lower journal; 1c. Connecting shaft; 2. Base frame; 2a. Upper ring body; 2b. Connecting rod; 2c. Lower ring body; 2d. Positioning groove; 2e. Brush grinding port; 3. Bottom cover; 3a. Sinking groove; 4. Upper bearing; 5. Lower bearing; 6. Grinding brush sleeve; 6a. Brush mounting hole; 6b. Positioning protrusion; 7. First screw; 8. Seat body; 8a. Base plate; 8b. Mounting block; 8c. Baffle; 8d. U-shaped opening; 9. Push block; 9a. U-shaped limiting groove; 10. Spring; 11. Pull rod; 12. Handle lever; 13. Cylinder; 14. Second screw; 15. Limiting pin; 16. Bearing sleeve; 17. Housing; 18. Partition; 19. Drive motor; 20. Dust suction port; 100. Brush to be ground. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0032] For ease of description, in this embodiment of the invention, "inner end" refers to one end that runs radially inward, and "outer end" refers to one end that runs radially outward.

[0033] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0034] Example 1:

[0035] Combination Figures 1 to 6 As shown, this is a first embodiment of a brush pre-grinding device provided by the present invention. The brush pre-grinding device includes a brush wheel 1 and a base frame 2. The base frame 2 includes an upper ring body 2a and a lower ring body 2c arranged at intervals, and the upper ring body 2a and the lower ring body 2c are connected by multiple connecting rods 2b. A bottom cover 3 is installed on the bottom surface of the lower ring body 2c. The upper journal 1a on the top surface of the brush wheel 1 is installed in the center hole of the upper ring body 2a through an upper bearing 4, and a bearing sleeve 16 is provided between the upper bearing 4 and the upper ring body 2a. The lower journal 1b on the bottom surface of the grinding wheel 1 is mounted in the center hole of the bottom cover 3 through the lower bearing 5; a plurality of grinding brush sleeves 6 are evenly distributed in a ring on the bottom surface of the upper ring body 2a; a brush mounting hole 6a is provided on the grinding brush sleeve 6 for slidingly mounting the brush 100 to be ground; a plurality of pushing devices are evenly distributed in a ring on the top surface of the lower ring body 2c for radially pushing the brush 100 to be ground against the outer circumferential surface of the grinding wheel 1; a connecting shaft 1c is integrally formed on the bottom surface of the lower journal 1b, and the connecting shaft 1c extends downward from the bottom cover 3 for connecting with the output shaft of the drive motor.

[0036] Combination Figure 4 As shown, in order to increase the loading capacity of the brushes 100 to be ground and improve the grinding efficiency, two brush mounting holes 6a are provided on the brush sleeve 6, and the two brush mounting holes 6a are arranged vertically. That is, during the pre-grinding of the brushes, two brushes 100 to be ground can be installed on each brush sleeve 6.

[0037] Combination Figure 3 and Figure 4As shown, the bottom surface of the upper ring 2a has multiple evenly distributed positioning grooves 2d arranged in a ring shape, and the positioning grooves 2d are arranged radially. A positioning protrusion 6b is provided on the top surface of the brush sleeve 6. The positioning protrusion 6b is fitted into the positioning groove 2d. The upper ring 2a and the brush sleeve 6 are fastened together by a first screw 7, which passes through the upper ring 2a from top to bottom and is then screwed onto the top surface of the brush sleeve 6. By utilizing the structure of the positioning protrusion 6b cooperating with the positioning groove 2d, a positioning function is achieved, which helps to ensure the positional accuracy of the brush sleeve 6 after assembly.

[0038] Combination Figure 1 As shown, a settling groove 3a is provided on the top surface of the bottom cover 3. The purpose of providing the settling groove 3a is to collect the particles that fall off after grinding.

[0039] In this embodiment, the pushing device includes a base 8 and a pusher block 9; the base 8 includes a base plate 8a, a mounting block 8b integrally formed on the top surface of the base plate 8a, and a baffle 8c; the baffle 8c is located on the top surface of the outer end of the base plate 8a, and a U-shaped opening 8d is provided on the baffle 8c; the pusher block 9 is slidably inserted into the rectangular hole of the mounting block 8b; the inner end of the pusher block 9 abuts against the end face of the brush 100 to be ground; the pushing device also includes a power source for providing radial force to the pusher block 9. Specifically, the power source is a spring 10; a pull rod 11 is provided on the end face of the outer end of the push block 9, and the outer end of the pull rod 11 passes through the U-shaped opening 8d; a handle 12 is inserted laterally into the end of the outer end of the pull rod 11; the spring 10 is sleeved on the pull rod 11, and the inner end of the spring 10 abuts against the push block 9, and the outer end of the spring 10 abuts against the baffle 8c; the spring 10 is always in a compressed and energy-storing state, therefore, the spring 10 can generate a radially inward thrust on the push block 9.

[0040] In this embodiment, the base 8, the lower ring 2c, and the bottom cover 3 are fastened together by a second screw 14; the second screw 14 passes through the base plate 8a and the lower ring 2c from top to bottom and is then screwed onto the bottom cover 3.

[0041] Combination Figure 1 and Figure 6As shown, a U-shaped limiting groove 9a is provided on the push block 9, with the opening of the U-shaped limiting groove 9a facing the grinding wheel 1; a limiting pin 15 is inserted laterally into the mounting block 8b; the limiting pin 15 extends into the limiting groove 9a. During grinding, the push block 9 moves radially inward under the action of the spring 10. When the limiting pin 15 abuts against the bottom of the U-shaped limiting groove 9a, the push block 9 has moved to its position, indicating that the brush 100 to be ground has been ground to the required position. Therefore, by utilizing the limiting structure formed by the limiting pin 15 and the limiting groove 9a, it is beneficial to ensure that the grinding amount of each brush 100 to be ground is consistent, so that the processed brushes are of consistent length.

[0042] In this embodiment, the upper ring 2a, lower ring 2c, and connecting rod 2b are integrally formed. Two adjacent connecting rods 2b, together with the upper ring 2a and lower ring 2c, form a brush grinding opening 2e. Specifically, there are four connecting rods 2b, which are evenly distributed in a ring to form four brush grinding openings 2e. A brush sleeve 6 is provided at each brush grinding opening 2e; each brush sleeve 6 corresponds to one of the aforementioned pushing devices.

[0043] The brush pre-grinding device provided in this embodiment has the following application scenarios: Figure 8 As shown. During use, the brush pre-brushing device is installed on the partition 18 of the housing 17; the partition 18 divides the inner cavity of the housing 17 into an upper cavity and a lower cavity. A drive motor 19 is installed in the lower cavity, and the connecting shaft 1c on the brush wheel 1 is connected to the output shaft of the drive motor 19. The drive motor 19 can drive the brush wheel 1 to rotate. A dust suction port 20 is provided on the side wall of the upper cavity for connecting a dust purification device to reduce the amount of dust inside the housing 17.

[0044] In this embodiment, the brush wheel 1 adopts a stainless steel diamond-plated structure, which can improve the brushing efficiency and service life of the brush wheel 1, reduce the pre-brushing time, and avoid frequent replacement of the brush wheel 1 during the brushing process.

[0045] The brush pre-grinding device provided in this embodiment operates on the following principle:

[0046] First, the operator pulls the lever 11 radially outward, overcoming the spring force of the spring 10, causing the push block 9 to slide radially outward within the rectangular hole of the mounting block 8b. At this point, the operator can insert the brush to be ground 100 into the brush mounting hole 6a of the brush sleeve 6. The operator then releases the lever 11, causing the push block 9 to move radially inward under the action of the spring 10, thus pushing the brush to be ground 100 radially inward and providing pre-pressure. By using the drive motor 19 to drive the brush wheel 1 to rotate, the brush to be ground 100 can be ground. During the grinding process, the spring 10 always acts on the push block 9, ensuring that the brush to be ground 100 always rests against the brush wheel 1 for grinding, thereby guaranteeing the pre-grinding effect. When the limit pin 15 abuts against the bottom of the U-shaped limit groove 9a, the push block 9 moves into position, indicating that the brush 100 to be ground has been ground. The drive motor 19 can then be turned off, and the operator can pull the pull rod 11 radially outward to make the push block 9 slide radially outward, thus removing the ground brush.

[0047] Example 2:

[0048] Combination Figure 7 The above describes a second embodiment of the brush pre-grinding device provided by the present invention. The difference between this second embodiment and the first embodiment is that the power source is a cylinder 13; the cylinder 13 is mounted on the baffle 8c; the telescopic rod of the cylinder 13 passes through the U-shaped opening 8d and connects to the push block 9. The remaining structure of the second embodiment is the same as that of the first embodiment, and will not be described further here.

[0049] The brush pre-grinding device provided in this embodiment 2 operates on the following principle:

[0050] First, by controlling cylinder 13, the telescopic rod of cylinder 13 retracts, thereby driving push block 9 to slide radially outward within the rectangular hole of mounting block 8b. At this time, the operator can insert the brush to be ground 100 into the brush mounting hole 6a of the brush sleeve 6. After the brush to be ground 100 is installed, cylinder 13 is activated, causing the telescopic rod of cylinder 13 to extend, causing push block 9 to move radially inward, thus pushing the brush to be ground 100 radially inward and providing pre-pressure to the brush to be ground. By using drive motor 19 to drive the brush wheel 1 to rotate, the brush to be ground 100 can be ground. During the grinding process, cylinder 13 always acts on push block 9, ensuring that the brush to be ground 100 always rests against the brush wheel 1 for grinding, thus helping to ensure the pre-grinding effect. When the limit pin 15 abuts against the bottom of the U-shaped limit groove 9a, the push block 9 moves into position, indicating that the brush 100 to be ground has been ground. The drive motor 19 can then be turned off, and the telescopic rod of the cylinder 13 can be retracted by controlling the cylinder 13, so that the push block 9 slides in the radial outward direction, and the ground brush can be taken out.

[0051] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A brush pre-grinding device, characterized in that, Includes a grinding wheel (1) and a base frame (2); The base frame (2) includes an upper ring body (2a) and a lower ring body (2c) spaced apart vertically, and the upper ring body (2a) and the lower ring body (2c) are connected by multiple connecting rods (2b); a bottom cover (3) is installed on the bottom surface of the lower ring body (2c). The upper journal (1a) on the top surface of the grinding wheel (1) is installed in the center hole of the upper ring body (2a) through the upper bearing (4), and the lower journal (1b) on the bottom surface of the grinding wheel (1) is installed in the center hole of the bottom cover (3) through the lower bearing (5); a plurality of grinding brush sleeves (6) are evenly distributed in a ring on the bottom surface of the upper ring body (2a); a brush mounting hole (6a) is provided on the grinding brush sleeve (6) for sliding installation of the brush to be ground (100); Multiple pushing devices are evenly distributed in a ring on the top surface of the lower ring body (2c) to radially push the brush to be ground (100) against the outer circumferential surface of the brush wheel (1); The bottom surface of the lower journal (1b) is integrally formed with a connecting shaft (1c), which extends downward from the bottom cover (3) for connection with the output shaft of the drive motor. The pushing device includes a base (8) and a pusher (9); the base (8) includes a base plate (8a), a mounting block (8b) integrally formed on the top surface of the base plate (8a), and a baffle (8c); the baffle (8c) is located on the top surface of the outer end of the base plate (8a), and a U-shaped opening (8d) is provided on the baffle (8c); the pusher (9) is slidably inserted into the rectangular hole of the mounting block (8b); the inner end of the pusher (9) abuts against the end face of the brush (100) to be ground; the pushing device also includes a power source for providing radial force to the pusher (9); The power source is a spring (10); a pull rod (11) is provided on the end face of the outer end of the push block (9), and the outer end of the pull rod (11) passes through the U-shaped opening (8d); a handle (12) is inserted laterally into the end of the outer end of the pull rod (11); the spring (10) is sleeved on the pull rod (11), and the inner end of the spring (10) abuts against the push block (9), and the outer end of the spring (10) abuts against the baffle (8c); the spring (10) is always in a compressed energy storage state; The upper ring (2a), lower ring (2c), and connecting rod (2b) are integrally formed. Two adjacent connecting rods (2b) together with the upper ring (2a) and lower ring (2c) form a brush grinding opening (2e). A brush sleeve (6) is provided at each brush grinding opening (2e). Each brush sleeve (6) is provided with a corresponding pushing device.

2. The brush pre-grinding device as described in claim 1, characterized in that, The brush sleeve (6) has two brush mounting holes (6a), and the two brush mounting holes (6a) are arranged vertically.

3. The brush pre-grinding device as described in claim 1, characterized in that, The bottom surface of the upper ring (2a) is evenly distributed with multiple positioning grooves (2d), and the positioning grooves (2d) are arranged radially; a positioning protrusion (6b) is provided on the top surface of the brush sleeve (6); the positioning protrusion (6b) is fitted into the positioning groove (2d); the upper ring (2a) and the brush sleeve (6) are fastened together by a first screw (7), and the first screw (7) passes through the upper ring (2a) from top to bottom and is screwed onto the top surface of the brush sleeve (6).

4. The brush pre-grinding device as described in claim 1, characterized in that, A recessed groove (3a) is provided on the top surface of the bottom cover (3).

5. The brush pre-grinding device as described in claim 1, characterized in that, The base (8), lower ring (2c), and bottom cover (3) are fastened together by a second screw (14); the second screw (14) passes through the base plate (8a) and lower ring (2c) from top to bottom and is then screwed onto the bottom cover (3).

6. The brush pre-grinding device as described in claim 1, characterized in that, A U-shaped limiting groove (9a) is provided on the push block (9), and the opening of the U-shaped limiting groove (9a) faces the brush wheel (1); a limiting pin (15) is inserted laterally on the mounting block (8b); the limiting pin (15) extends into the limiting groove (9a).

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