A rust removal device for the housing of a DC brushless motor used in a dehumidifier
By designing a rust removal device for the DC brushless motor housing that does not require disassembly, and utilizing a combination of a servo motor-driven six-sided rod and a brush plate, the device achieves thorough rust removal and rust chip collection for the dehumidifier motor housing, solving the problems of incomplete rust removal and rust chip splashing in existing technologies.
Patent Information
- Application Number
- CN202310549086.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-05-16
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2043-05-16
AI Technical Summary
In existing technologies, derusting the motor casing of dehumidifiers requires disassembly, which is cumbersome and incomplete, and the flying rust chips cause obstruction.
A rust removal device for the casing of a brushless DC motor without disassembling the motor was designed. It uses a servo motor to drive a combination of a six-sided rod and a brush plate to achieve full-coverage rust removal of the motor casing, and collects rust chips through a pump and a filter.
It achieves thorough rust removal of the motor casing, reduces rust debris from hindering subsequent rust removal operations, and improves rust removal efficiency and cleanliness.
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Figure CN116900899B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of motor technology, and more particularly to a rust removal device for the housing of a DC brushless motor used in dehumidifiers. Background Technology
[0002] The main function of a dehumidifier is to remove moisture by condensing water molecules in the air into water droplets. Once the air is dry, the water droplets are expelled from the dehumidifier, thereby reducing indoor humidity. Due to its special working environment, the motor inside a dehumidifier is prone to rust after long-term operation, so it is necessary to regularly clean the motor to remove rust.
[0003] Currently, removing rust from the motor of a dehumidifier requires disassembling the motor. Due to the large number of internal parts of the dehumidifier, disassembling the motor is very troublesome. The compact internal structure of the dehumidifier makes it difficult for workers to remove rust from the motor casing. As a result, the rust removal work is not thorough enough, and the rust chips generated by the workers during the rust removal process will fly everywhere, hindering subsequent rust removal work. Summary of the Invention
[0004] To address the shortcomings of current dehumidifier motor rust removal methods, which require cumbersome motor disassembly, are insufficient for thorough rust removal of the motor casing, and allow rust debris to potentially damage the dehumidifier, the present invention aims to provide a dehumidifier DC brushless motor casing rust removal device that eliminates the need for motor disassembly, achieves more thorough rust removal of the dehumidifier motor casing, and more effectively collects and removes rust debris.
[0005] A rust removal device for the housing of a DC brushless motor used in a dehumidifier includes a cover, a handle, a guide frame, a servo motor, an adjustment component, a rust removal component, bolts, a top brush plate, a six-sided rod, and a slotted sleeve. Two symmetrically arranged slots are formed on the upper part of the outer wall of the cover. A handle is fixedly connected to the top of the cover, and a guide frame is fixedly connected to the top of the cover. The servo motor is fixedly connected to the guide frame. The adjustment component and the rust removal component are both mounted on the guide frame. The rust removal component has bolts and a top brush plate. A six-sided rod is fixedly connected to the bottom end of the output shaft of the servo motor. The adjustment component has a slotted sleeve.
[0006] To further explain, the adjustment component includes a drive gear, a transmission gear, a gear ring, and protrusions. The top of the output shaft of the servo motor is fixedly connected to the drive gear. Two transmission gears are rotatably connected to the top of the guide frame. The two transmission gears are symmetrically arranged. The drive gear meshes with both transmission gears. A gear ring is rotatably connected to the top of the guide frame. The gear ring meshes with both transmission gears. Several protrusions are fixedly connected to the bottom of the gear ring.
[0007] Further explanation: The rust removal component includes a sliding ring, sliding rods, a guide plate, connecting springs, brush plates, and a sloping groove adjusting plate. A sliding ring is slidably connected to the lower part of the guide frame. Two sliding rods are slidably connected to the sliding ring, both passing through the sliding ring. The two sliding rods are symmetrically arranged, with their top ends contacting the bottom of the toothed ring. A guide plate is fixedly connected between the bottom ends of the two sliding rods. Two connecting springs are connected between the bottom of the sliding ring and the top of the guide plate, with the connecting springs sleeved on the sliding rods. Four brush plates are slidably connected to the guide plate, and a sloping groove adjusting plate is slidably connected between the four brush plates. The guide plate and the sloping groove adjusting plate are connected by threads. Two bolts are threadedly connected to the top of the guide plate, symmetrically arranged, passing through the guide plate. A top brush plate is threadedly connected between the bottom ends of the two bolts. A groove sleeve is fixedly connected to the top of the guide plate, and the six-sided rod is slidably connected to the groove sleeve.
[0008] To further clarify, both of the aforementioned sliding rods are vertically positioned.
[0009] Further explanation: It also includes a rust removal component, which is mounted on a guide plate. The rust removal component includes a mounting frame, a pump body, a conveying plate, a pipe body, and a filter screen cover. The mounting frame is fixedly connected to the guide plate, and the pipe body is fixedly connected to the bottom of the mounting frame. The pump body is fixedly connected to the pipe body and communicates with the pump body's output port. The conveying plate is fixedly connected to the pump body and communicates with the pump body's input port. The conveying plate has an arc-shaped groove and several input holes. The bottom of the pipe body is covered with a filter screen cover.
[0010] Further explanation: It also includes a rust powder scraping component, which is mounted on a guide frame. The rust powder scraping component includes a fixing plate, a sponge strip, and a return spring. The fixing plate is fixedly connected to the guide plate, and the sponge strip is slidably connected to the fixing plate. A return spring is connected between the fixing plate and the sponge strip.
[0011] To further explain, it also includes a rubber buffer sleeve, which is fixedly connected to the bottom of the cover.
[0012] To further clarify, the rubber buffer sleeve is made of a soft material.
[0013] The beneficial effects of this invention are:
[0014] The operator starts the servo motor, causing the output shaft at the bottom of the motor to rotate. This rotation drives the six-sided rod, sleeve, guide plate, bolts, connecting spring, top brush plate, brush plate, sliding rod, inclined groove adjusting plate, and sliding ring to all rotate. This causes the top brush plate and brush plate to remove rust from the dehumidifier's surface. Simultaneously, starting the servo motor also rotates the output shaft at the top, causing the gear ring to rotate. This rotation drives the protrusion at the bottom of the gear ring to rotate, pressing against the two sliding rods, causing the brush plate and top brush plate to move downwards. The gear ring drives the protrusion at the bottom of the gear ring to continue rotating, and the connecting spring will return to its original position, causing the brush plate and the top brush plate to move upward and return to their original positions. This allows the brush plate to brush the motor housing of the dehumidifier up and down, and also makes the top brush plate make closer contact with the top of the motor housing. In this way, the motor of the dehumidifier can be more thoroughly derusted without disassembly. Moreover, this device is suitable for motors of different specifications, and can make the top brush plate and brush plate more thoroughly brush away the rust on the surface of the dehumidifier, thus making the rust removal effect on the motor housing of the dehumidifier better.
[0015] When the operator starts the servo motor, causing the guide plate to rotate the top brush plate and the bristle brush plate, the guide plate will also rotate the mounting bracket, pump body, conveyor plate, pipe body, and filter cover. The top brush plate and bristle brush plate will brush away the rust on the dehumidifier's motor housing. At the same time, the operator will start the pump body, and the inlet hole on the conveyor plate will suck in the rust debris brushed off by the top brush plate on the dehumidifier's motor housing. The arc-shaped groove at the bottom of the conveyor plate will suck in the rust debris brushed off by the bristle brush plate on the dehumidifier's motor housing. The rust debris will fall onto the filter cover through the conveyor plate, pump body, and pipe body. After the dehumidifier has finished derusting, the operator will turn off the pump body, open the filter cover, and empty the rust debris. In this way, the rust debris brushed off the dehumidifier's motor housing can be collected and removed more effectively, thereby reducing the rust debris from hindering subsequent derusting and making the derusting of the dehumidifier's motor housing more thorough.
[0016] When this device is fitted onto the motor of the dehumidifier, the sponge strip will contact the motor housing. The dehumidifier will compress the sponge strip, causing it to move away from the conveyor plate. The return spring will be stretched, and then the guide plate will drive the fixing plate to rotate. The rotation of the fixing plate will cause both the sponge strip and the return spring to rotate, allowing the sponge strip to wipe away the fine rust on the motor housing of the dehumidifier. In this way, the rust removal of the motor housing of the dehumidifier can be more thorough, further improving the rust removal effect. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the first three-dimensional structure of the present invention.
[0018] Figure 2 This is a schematic diagram of the second three-dimensional structure of the present invention.
[0019] Figure 3 This is a partial cross-sectional three-dimensional structural schematic diagram of the present invention.
[0020] Figure 4 This is a partial three-dimensional structural diagram of the rust removal component of the present invention.
[0021] Figure 5 This is a partial three-dimensional structural diagram of the rust removal component and the rust removal component of the present invention.
[0022] Figure 6 This is a partially disassembled three-dimensional structural diagram of the rust removal component of the present invention.
[0023] Figure 7 This is a partial three-dimensional structural schematic diagram of the adjusting component of the present invention.
[0024] Figure 8 This is a three-dimensional structural diagram of the first type of rust removal component of the present invention.
[0025] Figure 9 This is a three-dimensional structural diagram of the second part of the rust removal component of the present invention.
[0026] Figure 10 This is a three-dimensional structural diagram of the third part of the rust removal component of the present invention.
[0027] Figure 11 This is a three-dimensional structural diagram of the adjusting component of the present invention.
[0028] Figure 12 This is a three-dimensional structural diagram of the bolt and top brush plate of the present invention.
[0029] Figure 13 This is a three-dimensional structural diagram of the rust removal component of the present invention.
[0030] Figure 14 This is a three-dimensional structural diagram of the conveyor plate of the present invention.
[0031] Figure 15 This is a three-dimensional structural diagram of the rust scraping component of the present invention.
[0032] Figure 16 This is a three-dimensional structural diagram of the servo motor of the present invention.
[0033] Explanation of reference numerals in the attached drawings: 1-Cover body, 101-Gate, 2-Handle, 31-Guide frame, 32-Servo motor, 41-Drive gear, 42-Transmission gear, 43-Gear ring, 44-Protrusion, 501-Sliding ring, 51-Sliding rod, 52-Guide plate, 53-Connecting spring, 54-Brush plate, 55-Slant groove adjusting plate, 61-Bolt, 62-Top brush plate, 71-Six-sided rod, 72-Gate sleeve, 81-Mounting bracket, 82-Pump body, 83-Conveying plate, 84-Pipe body, 85-Filter screen cover, 91-Fixing plate, 92-Sponge strip, 93-Reset spring, 10-Rubber buffer sleeve. Detailed Implementation
[0034] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, welding, and bonding that are mature in the prior art, and will not be described in detail here.
[0035] Example 1
[0036] A rust removal device for the housing of a DC brushless motor used in a dehumidifier, such as Figures 1-16 As shown, the device includes a cover 1, a handle 2, a guide frame 31, a servo motor 32, an adjustment component, a rust removal component, bolts 61, a top brush plate 62, a hexagonal rod 71, and a slotted sleeve 72. The upper part of the outer wall of the cover 1 has two slots 101 arranged symmetrically. The top of the cover 1 is bolted to the handle 2. The top of the inner part of the cover 1 is bolted to the guide frame 31. The servo motor 32 is riveted to the guide frame 31. The adjustment component and the rust removal component are both mounted on the guide frame 31. The rust removal component is used to remove rust from the dehumidifier casing and has bolts 61 and a top brush plate 62. The bottom of the output shaft of the servo motor 32 is bolted to the hexagonal rod 71. The adjustment component has a slotted sleeve 72.
[0037] The adjustment components include a drive gear 41, a transmission gear 42, a gear ring 43, and protrusions 44. The top of the output shaft of the servo motor 32 is connected to the drive gear 41 via a flat key. Two transmission gears 42 are rotatably connected to the top of the guide frame 31. The two transmission gears 42 are symmetrically arranged. The drive gear 41 meshes with both transmission gears 42. A gear ring 43 is rotatably connected to the top of the guide frame 31. The gear ring 43 meshes with both transmission gears 42. Several protrusions 44 are connected to the bottom of the gear ring 43 via rivets.
[0038] The rust removal component includes a sliding ring 501, sliding rods 51, a guide plate 52, a connecting spring 53, a brush plate 54, and a sloping groove adjusting plate 55. The sliding ring 501 is slidably connected to the lower part of the guide frame 31. Two sliding rods 51 are slidably connected to the sliding ring 501. Both sliding rods 51 are vertically arranged and pass through the sliding ring 501. The two sliding rods 51 are symmetrically arranged, and their top ends contact the bottom of the toothed ring 43. The bottom ends of the two sliding rods 51 are bolted together with the guide plate 52. The bottom of the sliding ring 501 and the top of the guide plate 52 are connected by hooks. A connecting spring 53 is sleeved on a sliding rod 51. Four brush plates 54 are slidably connected to the guide plate 52. A sloping groove adjusting plate 55 is slidably connected between the four brush plates 54. The guide plate 52 and the sloping groove adjusting plate 55 are connected by threads. Two bolts 61 are threadedly connected to the top of the guide plate 52. The two bolts 61 are symmetrically arranged and pass through the guide plate 52. A top brush plate 62 is connected to the bottom of the two bolts 61 by threads. A groove sleeve 72 is bolted to the top of the guide plate 52. The six-sided rod 71 is slidably connected to the groove sleeve 72.
[0039] First, the operator holds handle 2 and places the device onto the dehumidifier's motor. Then, the operator rotates the inclined groove adjustment plate 55 through slot 101 to a suitable angle, causing the four brush plates 54 to move closer to each other and into contact with the dehumidifier. Next, the operator rotates the two bolts 61 to a suitable position, causing the top brush plate 62 to move downwards and into contact with the top of the dehumidifier. The operator then starts the servo motor 32, causing the output shaft at the bottom of the servo motor 32 to rotate. The rotation of the output shaft at the bottom of the servo motor 32 drives the hexagonal rod 71 to rotate, which in turn drives the slot sleeve 72 to rotate. The rotation of the guide plate 52 causes the guide plate 52 to rotate, which in turn causes the bolt 61, connecting spring 53, top brush plate 62, brush plate 54, sliding rod 51, inclined groove adjusting plate 55, and sliding ring 501 to rotate. This allows the top brush plate 62 and brush plate 54 to brush away rust from the surface of the dehumidifier. Simultaneously, starting the servo motor 32 causes the output shaft at the top of the servo motor 32 to rotate. This rotation drives the drive gear 41 to rotate, which in turn drives the two transmission gears 42 to rotate. The rotation of the two transmission gears 42 drives the gear ring 43 to rotate, which in turn drives the protrusion 44 at the bottom of the gear ring 43. As the ring rotates, protrusion 44 contacts sliding rod 51. The rotation of protrusion 44 compresses the two sliding rods 51, causing them to move downwards. Connecting spring 53 is stretched, and the downward movement of the two sliding rods 51 drives guide plate 52 downwards. The downward movement of guide plate 52 drives brush plate 54, inclined groove adjusting plate 55, bolt 61, top brush plate 62, six-sided rod 71, and groove sleeve 72 to move downwards as well. Gear ring 43 drives protrusion 44 at its bottom to continue rotating, causing protrusion 44 to disengage from sliding rod 51. Connecting spring 53 resets, and its reset causes the two sliding rods 51 to move upwards and reset. The guide plate 52 moves upward and resets, which in turn moves the brush plate 54, the inclined groove adjusting plate 55, the bolt 61, the top brush plate 62, the six-sided rod 71, and the groove sleeve 72 upward and resets. This causes the brush plate 54 to brush the motor housing of the dehumidifier up and down, and also makes the top brush plate 62 make closer contact with the top of the motor housing of the dehumidifier. In this way, the motor of the dehumidifier can be more thoroughly derusted without disassembly. Moreover, this device is suitable for motors of different specifications, and can make the top brush plate 62 and the brush plate 54 more thoroughly brush away the rust on the surface of the dehumidifier, thus making the rust removal effect on the motor housing of the dehumidifier better.
[0040] Example 2
[0041] Based on Example 1, such as Figures 2-14As shown, it also includes a rust removal component, which is mounted on a guide plate 52. The rust removal component includes a mounting bracket 81, a pump body 82, a conveying plate 83, a pipe body 84, and a filter screen cover 85. The mounting bracket 81 is bolted to the guide plate 52. The bottom of the mounting bracket 81 is riveted to the pipe body 84. The pump body 82 is bolted to the pipe body 84, and the pipe body 84 is connected to the output port of the pump body 82. The conveying plate 83 is bolted to the pump body 82, and the input port of the pump body 82 is connected to the conveying plate 83. The conveying plate 83 has an arc-shaped groove and several input holes. The bottom of the pipe body 84 is covered with a filter screen cover 85.
[0042] When the operator starts the servo motor 32, causing the guide plate 52 to rotate, it drives the top brush plate 62 and the bristle brush plate 54 to rotate. The guide plate 52 then rotates the mounting bracket 81, pump body 82, conveyor plate 83, pipe body 84, and filter cover 85. The top brush plate 62 and bristle brush plate 54 remove rust from the dehumidifier's motor housing. Simultaneously, the operator starts the pump body 82, and the input port on the conveyor plate 83 sucks in rust chips brushed off by the top brush plate 62 from the dehumidifier's motor housing. The arc-shaped groove at the bottom of the conveyor plate 83 sucks in rust chips brushed off by the bristle brush plate 54 from the dehumidifier's motor housing. Rust flakes will enter the inlet of pump body 82 through conveyor plate 83, then enter the outlet of pump body 82 through the inlet, and finally enter pipe body 84 through the outlet. The rust flakes will fall onto filter screen cover 85 through pipe body 84. After the dehumidifier has finished derusting, the operator turns off pump body 82, opens filter screen cover 85 and pours out the rust flakes. In this way, the rust flakes brushed off the motor housing of the dehumidifier can be collected and removed more effectively, thereby reducing the rust flakes from hindering subsequent derusting and making the derusting of the motor housing of the dehumidifier more thorough.
[0043] Example 3
[0044] Based on Example 2, such as Figure 15 As shown, it also includes a rust powder scraping component, which is mounted on the guide frame 31. The rust powder scraping component includes a fixing plate 91, a sponge strip 92, and a return spring 93. The fixing plate 91 is bolted to the guide plate 52, and the sponge strip 92 is slidably connected to the fixing plate 91. The return spring 93 is connected between the fixing plate 91 and the sponge strip 92 by a hook.
[0045] When this device is fitted onto the motor of the dehumidifier, the sponge strip 92 will contact the motor housing of the dehumidifier. The motor housing of the dehumidifier will squeeze the sponge strip 92, causing the sponge strip 92 to move away from the conveyor plate 83. The return spring 93 will be stretched, and then the guide plate 52 will drive the fixing plate 91 to rotate. The rotation of the fixing plate 91 will drive both the sponge strip 92 and the return spring 93 to rotate, so that the sponge strip 92 can wipe away the fine rust on the motor housing of the dehumidifier. In this way, the rust removal of the motor housing of the dehumidifier can be more thorough, and the rust removal effect of the motor housing of the dehumidifier can be further improved.
[0046] Example 4
[0047] Based on Example 3, such as Figures 1-3 As shown, it also includes a rubber buffer sleeve 10, which is fixedly connected to the bottom of the cover 1. The rubber buffer sleeve 10 is made of soft material.
[0048] When this device is placed on the motor of the dehumidifier, the rubber buffer sleeve 10 can act as a buffer, effectively protecting both the device and the motor of the dehumidifier.
[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.
Claims
1. A rust removal device for the housing of a DC brushless motor used in a dehumidifier, characterized in that: The device includes a cover (1), a handle (2), a guide frame (31), a servo motor (32), an adjustment component, a rust removal component, a bolt (61), a top brush plate (62), a six-sided rod (71), and a slotted sleeve (72). The upper part of the outer wall of the cover (1) has two slots (101) which are symmetrically arranged. The top of the cover (1) is fixedly connected to the handle (2). The top of the cover (1) is fixedly connected to the guide frame (31). The servo motor (32) is fixedly connected to the guide frame (31). The adjustment component and the rust removal component are both set on the guide frame (31). The rust removal component is provided with a bolt (61) and a top brush plate (62). The bottom of the output shaft of the servo motor (32) is fixedly connected to a six-sided rod (71). The adjustment component is provided with a slotted sleeve (72). The rust removal components include a sliding ring (501), sliding rods (51), a guide plate (52), connecting springs (53), a brush plate (54), and a sloping groove adjusting plate (55). The sliding ring (501) is slidably connected to the lower part of the guide frame (31). Two sliding rods (51) are slidably connected to the sliding ring (501). Both sliding rods (51) pass through the sliding ring (501) and are symmetrically arranged. The tops of the two sliding rods (51) contact the bottom of the toothed ring (43). A guide plate (52) is fixedly connected between the bottom ends of the two sliding rods (51). Two connecting springs (53) are connected between the bottom of the sliding ring (501) and the top of the guide plate (52). The connecting spring (53) is sleeved on the sliding rod (51). Four brush plates (54) are slidably connected to the guide plate (52). A sloping groove adjustment plate (55) is slidably connected between the four brush plates (54). The guide plate (52) and the sloping groove adjustment plate (55) are connected by threads. Two bolts (61) are threadedly connected to the top of the guide plate (52). The two bolts (61) are symmetrically arranged and pass through the guide plate (52). A top brush plate (62) is connected between the bottom ends of the two bolts (61) by threads. A groove sleeve (72) is fixedly connected to the top of the guide plate (52). The six-sided rod (71) is slidably connected to the groove sleeve (72).
2. The rust removal device for the housing of a DC brushless motor for a dehumidifier according to claim 1, characterized in that: The adjustment components include a drive gear (41), a transmission gear (42), a gear ring (43), and protrusions (44). The top of the output shaft of the servo motor (32) is fixedly connected to the drive gear (41). The top of the guide frame (31) is rotatably connected to two transmission gears (42). The two transmission gears (42) are symmetrically arranged. The drive gear (41) meshes with both transmission gears (42). The top of the guide frame (31) is rotatably connected to a gear ring (43). The gear ring (43) meshes with both transmission gears (42). Several protrusions (44) are fixedly connected to the bottom of the gear ring (43).
3. The rust removal device for the housing of a DC brushless motor for a dehumidifier according to claim 2, characterized in that: Both of the sliding rods (51) are set vertically.
4. A rust removal device for the housing of a DC brushless motor for a dehumidifier according to claim 3, characterized in that: It also includes a rust removal component, which is set on a guide plate (52). The rust removal component includes a mounting bracket (81), a pump body (82), a conveying plate (83), a pipe body (84), and a filter screen cover (85). The mounting bracket (81) is fixedly connected to the guide plate (52). The pipe body (84) is fixedly connected to the bottom of the mounting bracket (81). The pump body (82) is fixedly connected to the pipe body (84). The pipe body (84) is connected to the output port of the pump body (82). The conveying plate (83) is fixedly connected to the pump body (82). The input port of the pump body (82) is connected to the conveying plate (83). The conveying plate (83) has an arc-shaped groove and several input holes. The bottom of the pipe body (84) is covered with a filter screen cover (85).
5. A rust removal device for the housing of a DC brushless motor for a dehumidifier according to claim 4, characterized in that: It also includes a rust powder scraping component, which is mounted on a guide frame (31). The rust powder scraping component includes a fixing plate (91), a sponge strip (92), and a return spring (93). The fixing plate (91) is fixedly connected to the guide plate (52), and the sponge strip (92) is slidably connected to the fixing plate (91). The return spring (93) is connected between the fixing plate (91) and the sponge strip (92).
6. A rust removal device for the housing of a DC brushless motor for a dehumidifier according to claim 5, characterized in that: It also includes a rubber buffer sleeve (10), which is fixedly connected to the bottom of the cover (1).
7. A rust removal device for the housing of a DC brushless motor for a dehumidifier according to claim 6, characterized in that: The rubber buffer sleeve (10) is made of soft material.
Citation Information
Patent Citations
Electric rust removal cylinder for hexagonal head bolt
CN218697311U