Device for grinding brake cylinder

Abstract

A device for grinding a brake cylinder comprises a body, a three-jaw chuck is arranged on the body, a moving mechanism capable of moving on the horizontal plane is further arranged on the body, an ultrasonic vibration grinding mechanism is arranged on the upper end face of the moving mechanism, an insulating chuck is arranged on the three-jaw chuck, and the insulating chuck is used for clamping the brake cylinder to be ground. An electrolysis mechanism is further arranged and arranged on the upper end face of the moving mechanism, and the electrolysis mechanism can make contact with the brake cylinder to be ground. According to the grinding device for the brake cylinder, the electrolysis mechanism is arranged, a to-be-ground part is electrolyzed before the brake cylinder is ground, a layer of passivation film with the low hardness is generated at the to-be-ground part, then the ultrasonic vibration grinding mechanism is adopted for grinding the to-be-ground part, the situation that the grinding efficiency is too low due to the fact that the hardness of a grinding material is large is avoided, and the grinding efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of brake cylinder grinding, in particular to a device for grinding a brake cylinder. Background Art

[0002] With the development of aerospace, optics and other technologies, higher requirements are placed on the surface quality of complex precision parts. Polishing of automotive equipment is a common and important processing method in industrial production. The quality of polishing directly affects the surface quality, flatness and performance of the workpiece.

[0003] At present, there are two main methods for polishing cars: one is polishing with a milling machine, and the other is manual polishing. The quality of the surface polished by a milling machine mainly depends on the milling cutter, and the polishing cost is very high, so it is not widely used in many fields; although manual polishing can greatly reduce the cost, the flatness of the polishing cannot be guaranteed. For the grinding of brake cylinders, in order to achieve low-cost and high-quality grinding and polishing in the prior art, the patent document with announcement number CN217097206U proposes a rotating ultrasonic grinding brake cylinder device, which uses an ultrasonic vibration grinding mechanism to grind the brake cylinder, and uses an ultrasonic generator to roll and vibrate the grinding particles on the polishing wheel to complete the replacement of the grinding particles, thereby ensuring the polishing quality while reducing the production cost.

[0004] However, when the brake cylinder is directly ground using an ultrasonic vibration grinding mechanism, due to the high hardness of the brake cylinder material, the time required to grind the brake cylinder using the ultrasonic vibration grinding mechanism is too long, which seriously affects the production efficiency of the brake cylinder. Utility Model Content

[0005] The utility model aims at the problem of low efficiency in grinding brake cylinders in the prior art and provides a device for grinding brake cylinders which can grind quickly.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A device for grinding a brake cylinder is provided, comprising a body, a three-jaw chuck is arranged on the body, a moving mechanism that can move on a horizontal plane is also arranged on the body, an ultrasonic vibration grinding mechanism is arranged on the upper end surface of the moving mechanism, an insulating chuck is arranged on the three-jaw chuck, the insulating chuck is used to clamp the brake cylinder to be ground, and an electrolysis mechanism is also arranged, the electrolysis mechanism is arranged on the upper end surface of the moving mechanism, and the electrolysis mechanism can contact the brake cylinder to be ground. Through the electrolysis mechanism, the part to be ground is electrolyzed before the brake cylinder is ground, and a passivation film with low hardness is generated at the part to be ground, and then the part to be ground is ground by the ultrasonic vibration grinding mechanism, so as to avoid the situation that the grinding efficiency is too low due to the high hardness of the grinding material, and improve the grinding efficiency.

[0008] Preferably, the electrolysis mechanism includes a power supply and a peristaltic pump, one end of the peristaltic pump is connected to a storage tank for storing electrolyte, the power supply, peristaltic pump and storage tank are all fixedly mounted on the mobile mechanism, the other end of the peristaltic pump is connected to a graphite tube arranged hollow inside, the graphite tube is fixedly mounted on the mobile mechanism, a first rubber sleeve is arranged between the graphite tube and the mobile mechanism, one end of the graphite tube can extend into the interior of the brake cylinder to be ground, the other end of the graphite tube is connected to the negative electrode of the power supply, the electrolysis mechanism also includes a conductive sheet, the conductive sheet is fixedly mounted on the mobile mechanism, a second rubber sleeve is arranged between the conductive sheet and the mobile mechanism, one end of the conductive sheet is connected to the positive electrode of the power supply, and the other end of the conductive sheet can abut against the brake cylinder to be ground. Through the set peristaltic pump, the electrolyte can be quantitatively transported to the inside of the brake cylinder, avoiding the waste of electrolyte or insufficient electrolysis in the brake cylinder due to the inability to accurately control the amount of electrolyte. On the premise of saving electrolyte, sufficient electrolysis in the brake cylinder can be ensured. Through the set graphite tube and conductive sheet, when the graphite tube is extended into the brake cylinder, the conductive sheet contacts the brake cylinder. At this time, the power supply-graphite tube-electrolyte-brake cylinder-conductive sheet forms a current loop, and there is no need for the staff to manually connect the positive and negative electrodes of the power supply, thereby improving the automation degree of the equipment. Through the set first rubber sleeve and the second rubber sleeve, in cooperation with the set insulating chuck, it can be avoided that the electrolysis efficiency is reduced due to the current passing through the moving mechanism or the three-jaw chuck after the power is turned on, thereby ensuring the efficiency of the electrolysis.

[0009] Preferably, the ultrasonic vibration grinding mechanism includes an ultrasonic generator, which is fixedly arranged on the mobile mechanism, one end of the ultrasonic generator is connected to a transducer, the end of the transducer away from the ultrasonic generator is connected to a horn, the horn is connected to a rotating shaft, the end of the rotating shaft away from the horn is provided with a polishing wheel, and the polishing wheel can extend into the brake cylinder to be ground. Through the transducer and horn, the conversion of ultrasound into vibration and the amplification of vibration can be achieved, the high-frequency vibration of the polishing wheel at one end of the ultrasonic vibration grinding mechanism is achieved, the rolling vibration of the grinding particles on the polishing wheel is completed, and the efficient grinding of the inner circumference of the brake cylinder is achieved.

[0010] Preferably, a first slide rail is provided on the main body, the length direction of the first slide rail is parallel to the axis of the three-jaw chuck, the moving mechanism includes a first slide table, a first slide groove is provided at the lower part of the first slide table, the first slide groove is sleeved on the first slide rail, and the moving mechanism also includes a first motor, the first motor is fixed on the main body, the output shaft of the first motor is connected to the first lead screw, a first through slot is provided on the first slide table, and a first nut sleeved with the first lead screw is provided in the first through slot. By providing the first motor, the first lead screw and the first nut, the reciprocating motion of the ultrasonic vibration grinding mechanism and the electrolysis mechanism in the axis direction of the three-jaw chuck can be realized, and the moving distance can be accurately controlled to avoid the inaccurate distance of the ultrasonic vibration grinding mechanism or the electrolysis mechanism inserted into the brake cylinder by manual movement of personnel, thereby affecting the electrolysis or grinding effect.

[0011] Preferably, a second slide rail is provided on the upper surface of the first slide, the length direction of the second slide rail is parallel to the horizontal plane and perpendicular to the length direction of the first slide rail, the moving mechanism also includes a second slide, a second slide groove is provided at the lower part of the second slide, the second slide groove is sleeved on the second slide rail, the moving mechanism also includes a second motor, the second motor is fixedly arranged on the first slide, the output shaft of the second motor is connected to the second lead screw, a second through slot is provided on the second slide, and a second nut sleeved with the second lead screw is provided in the second through slot. By providing the second motor, the second lead screw and the second nut, the switching between the ultrasonic vibration grinding mechanism and the electrolysis mechanism can be avoided, and the axis cannot overlap in the horizontal direction due to manual movement of the ultrasonic vibration grinding mechanism or the electrolysis mechanism, thereby improving the effect of electrolysis and grinding.

[0012] Preferably, the electrolysis mechanism and the ultrasonic vibration grinding mechanism are both fixedly mounted on the upper end surface of the second slide. By fixing the electrolysis mechanism and the ultrasonic vibration grinding mechanism on the upper end surface of the second slide, the working positions of the electrolysis mechanism and the ultrasonic vibration grinding machine can be switched by only adjusting the first motor and the second motor, without manual switching, thereby improving the grinding efficiency.

[0013] Preferably, the axis of the graphite tube, the axis of the rotating shaft and the axis of the three-jaw chuck are all arranged in parallel on the same horizontal plane. By arranging the axis of the rotating shaft and the axis of the graphite tube and the axis of the three-jaw chuck on the same horizontal plane, there is no need to adjust the distance in the vertical direction during the operation of the equipment. Only the first motor and the second motor need to be controlled, and the working position switching of the electrolysis mechanism and the ultrasonic vibration grinder can be achieved without adding a lifting motor in the vertical direction, thereby reducing the equipment cost.

[0014] It can be seen from the above technical scheme that the advantages of the utility model are: through the electrolysis mechanism that is set up, the part to be ground is electrolyzed before grinding the brake cylinder, a passivation film with lower hardness is generated at the part to be ground, and then an ultrasonic vibration grinding mechanism is used to grind the part to be ground, thereby avoiding the situation where the grinding efficiency is too low due to the high hardness of the grinding material, and improving the grinding efficiency. The peristaltic pump can quantitatively deliver electrolyte to the brake cylinder, avoiding electrolyte waste or insufficient electrolysis in the brake cylinder due to the inability to accurately control the amount of electrolyte. The electrolysis in the brake cylinder can be fully guaranteed under the premise of saving electrolyte. The graphite tube and the conductive sheet are provided, and the conductive sheet contacts the brake cylinder when the graphite tube is inserted into the brake cylinder. At this time, the power supply-graphite tube-electrolyte-brake cylinder-conductive sheet forms a current loop, and the staff does not need to manually connect the positive and negative poles of the power supply, which improves the automation of the equipment. The first rubber sleeve and the second rubber sleeve, in conjunction with the insulating chuck provided, can avoid the reduction of electrolysis efficiency caused by the current passing through the moving mechanism or the three-jaw chuck after the power is turned on, thereby ensuring the efficiency of electrolysis. The transducer and the amplitude rod provided can realize the conversion of ultrasound into vibration and the amplification of vibration, realize the high-frequency vibration of the polishing wheel at one end of the ultrasonic vibration grinding mechanism, complete the rolling vibration of the grinding particles on the polishing wheel, and realize the efficient grinding of the inner circumference of the brake cylinder. By setting the first motor, the first screw and the first nut, the ultrasonic vibration grinding mechanism and the electrolysis mechanism can realize the reciprocating motion in the axis direction of the three-jaw chuck, and the moving distance can be accurately controlled to avoid the inaccurate distance of the ultrasonic vibration grinding mechanism or the electrolysis mechanism inserted into the brake cylinder by manual movement of the personnel, thereby affecting the electrolysis or grinding effect. By setting the second motor, the second screw and the second nut, the switching between the ultrasonic vibration grinding mechanism and the electrolysis mechanism can be avoided, and the axis cannot overlap in the horizontal direction due to manual movement of the ultrasonic vibration grinding mechanism or the electrolysis mechanism, thereby improving the electrolysis and grinding effect. By fixing the electrolysis mechanism and the ultrasonic vibration grinding mechanism on the upper end surface of the second slide, it is only necessary to adjust the first motor and the second motor to realize the switching of the working positions of the electrolysis mechanism and the ultrasonic vibration grinder, without the need for manual switching, thereby improving the grinding efficiency. By arranging the axis of the rotating shaft and the axis of the graphite tube and the axis of the three-jaw chuck on the same horizontal plane, there is no need to adjust the distance in the vertical direction during the operation of the equipment. Only the first motor and the second motor need to be controlled. Without adding a lifting motor in the vertical direction, the working position of the electrolysis mechanism and the ultrasonic vibration grinder can be switched, thereby reducing the equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a specific implementation method of the utility model;

[0016] Figure 2It is a structural front view of a specific implementation mode of the utility model;

[0017] Figure 3 It is a structural top view of a specific implementation method of the utility model.

[0018] Description of main reference numerals

[0019] 1. Main body; 11. First slide rail; 2. Three-jaw chuck; 3. Brake cylinder; 4. Ultrasonic vibration grinding mechanism; 41. Ultrasonic generator; 42. Transducer; 43. Amplitude change rod; 44. Rotating shaft; 45. Polishing wheel; 5. Moving mechanism; 51. First slide; 511. First slide groove; 512. First through groove; 52. First motor; 53. First lead screw; 54. Second slide; 55. Second motor; 6. Electrolysis mechanism; 61. Power supply; 62. Peristaltic pump; 63. Storage tank; 64. Graphite tube; 65. Conductive sheet; 7. Insulating chuck; 8. First rubber sleeve; 9. Second rubber sleeve. DETAILED DESCRIPTION

[0020] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0021] Example:

[0022] like Figures 1 to 3As shown, a device for grinding a brake cylinder is provided, comprising a body 1, a three-jaw chuck 2 is arranged on the body 1, a moving mechanism 5 capable of moving on a horizontal plane is also arranged on the body 1, a first slide rail 11 is arranged on the body 1, and the length direction of the first slide rail 11 is parallel to the axis of the three-jaw chuck 2, the moving mechanism 5 comprises a first slide 51, a first slide groove 511 is arranged at the lower part of the first slide 51, and the first slide groove 511 is sleeved on the first slide rail 11, the moving mechanism 5 also comprises a first motor 52, the first motor 52 is fixedly arranged on the body 1, the output shaft of the first motor 52 is connected with a first lead screw 53, a first through groove 512 is opened on the first slide 51, a first nut sleeved with the first lead screw 53 is arranged in the first through groove 512, a second slide rail is arranged on the upper end surface of the first slide 51, and the length direction of the second slide rail is parallel to the horizontal plane and perpendicular to the length direction of the first slide rail 11, the moving mechanism 5 also comprises a second slide 54, a second slide 54 is arranged at the lower part The second slide groove is sleeved on the second slide rail, and the moving mechanism 5 also includes a second motor 55, which is fixed on the first slide 51, and the output shaft of the second motor 55 is connected with a second screw. The second slide 54 is provided with a second through groove, and a second nut sleeved with the second screw is arranged in the second through groove. In this way, through the first motor 52, the first screw 53 and the first nut, the ultrasonic vibration grinding mechanism 4 and the electrolysis mechanism 6 can be reciprocated in the axial direction of the three-jaw chuck 2, and the moving distance can be accurately controlled to avoid the inaccurate distance of the ultrasonic vibration grinding mechanism 4 or the electrolysis mechanism 6 extended into the brake cylinder 3 by manual movement of the personnel, thereby affecting the electrolysis or grinding effect. By arranging the second motor 55, the second screw and the second nut, the ultrasonic vibration grinding mechanism 4 and the electrolysis mechanism 6 can be switched to avoid the inability to overlap the axes in the horizontal direction due to manual movement of the ultrasonic vibration grinding mechanism 4 or the electrolysis mechanism 6, thereby improving the electrolysis and grinding effects.

[0023] In this embodiment, an ultrasonic vibration grinding mechanism 4 is arranged on the upper end surface of the moving mechanism 5, and the ultrasonic vibration grinding mechanism 4 includes an ultrasonic generator 41, which is fixedly arranged on the moving mechanism 5, one end of the ultrasonic generator 41 is connected to a transducer 42, and the end of the transducer 42 away from the ultrasonic generator 41 is connected to a variable amplitude rod 43, and the variable amplitude rod 43 is connected to a rotating shaft 44, and the end of the rotating shaft 44 away from the variable amplitude rod 43 is provided with a polishing wheel 45, and the polishing wheel 45 can extend into the interior of the brake cylinder 3 to be ground. In this arrangement, through the arranged transducer 42 and the variable amplitude rod 43, the conversion of ultrasound into vibration and the amplification of vibration can be realized, and the high-frequency vibration of the polishing wheel 45 at one end of the ultrasonic vibration grinding mechanism 4 is realized, the tumbling vibration of the grinding particles on the polishing wheel 45 is completed, and the efficient grinding of the inner circumference of the brake cylinder 3 is realized.

[0024] In this embodiment, an insulating chuck 7 is provided on the three-jaw chuck 2, and the insulating chuck 7 is used to clamp the brake cylinder 3 to be ground. An electrolytic mechanism 6 is also provided. The electrolytic mechanism 6 is arranged on the upper end surface of the moving mechanism 5. The electrolytic mechanism 6 can contact the brake cylinder 3 to be ground. The electrolytic mechanism 6 includes a power supply 61 and a peristaltic pump 62. One end of the peristaltic pump 62 is connected to a storage tank 63 for storing electrolyte. The power supply 61, the peristaltic pump 62 and the storage tank 63 are all fixedly arranged on the moving mechanism 5. The other end of the peristaltic pump 62 is connected to a graphite tube 64 arranged hollow inside. The graphite tube 64 is fixedly arranged On the moving mechanism 5, a first rubber sleeve 8 is arranged between the graphite tube 64 and the moving mechanism 5, one end of the graphite tube 64 can extend into the interior of the brake cylinder 3 to be ground, and the other end of the graphite tube 64 is connected to the negative electrode of the power supply 61, and the electrolysis mechanism 6 also includes a conductive sheet 65, which is fixed on the moving mechanism 5, and a second rubber sleeve 9 is arranged between the conductive sheet 65 and the moving mechanism 5, one end of the conductive sheet 65 is connected to the positive electrode of the power supply 61, and the other end of the conductive sheet 65 can abut against the brake cylinder 3 to be ground. In this way, through the electrolysis mechanism 6, when grinding the brake cylinder 3, the part to be ground is electrolyzed to form a passivation film with low hardness at the part to be ground, and then the ultrasonic vibration grinding mechanism 4 is used to grind the part to be ground, so as to avoid the situation that the grinding efficiency is too low due to the high hardness of the grinding material, and improve the grinding efficiency. The peristaltic pump 62 can quantitatively transport electrolyte to the inside of the brake cylinder 3, so as to avoid the waste of electrolyte or insufficient electrolysis inside the brake cylinder 3 caused by the inability to accurately control the amount of electrolyte. Under the premise of saving electrolyte, it can ensure that the brake cylinder 3 is fully electrolyzed. The graphite tube 64 and the conductive sheet 65, when the graphite tube 64 extends into the brake cylinder 3, the conductive sheet 65 contacts the brake cylinder 3. At this time, the power supply 61-graphite tube 64-electrolyte-brake cylinder 3-conductive sheet 65 forms a current loop, and there is no need for the staff to manually connect the positive and negative poles of the power supply 61, thereby improving the degree of automation of the equipment. The first rubber sleeve 8 and the second rubber sleeve 9, in conjunction with the insulating chuck 7, can avoid the reduction of electrolysis efficiency caused by the current passing through the moving mechanism 5 or the three-jaw chuck 2 after the power supply 61 is turned on, thereby ensuring the efficiency of the electrolysis.

[0025] In this embodiment, the electrolysis mechanism 6 and the ultrasonic vibration grinding mechanism 4 are both fixed on the upper end surface of the second slide 54, and the axis of the graphite tube 64, the axis of the rotating shaft 44 and the axis of the three-jaw chuck 2 are all on the same horizontal plane and are arranged in parallel. In this arrangement, by fixing the electrolysis mechanism 6 and the ultrasonic vibration grinding mechanism 4 on the upper end surface of the second slide 54, it is only necessary to adjust the first motor 52 and the second motor 55 to achieve the switching of the working positions of the electrolysis mechanism 6 and the ultrasonic vibration grinder, without the need for manual assisted switching, thereby improving the grinding efficiency, and by setting the axis of the rotating shaft 44 and the axis of the graphite tube 64 on the same horizontal plane as the axis of the three-jaw chuck 2, there is no need to adjust the distance in the vertical direction during the operation of the equipment, and only the first motor 52 and the second motor 55 need to be controlled, and there is no need to add a lifting motor in the vertical direction to achieve the switching of the working positions of the electrolysis mechanism 6 and the ultrasonic vibration grinder, thereby reducing the equipment cost.

[0026] Steps for using the device for grinding the brake cylinder:

[0027] S1, install the brake cylinder 3 to be ground onto the three-jaw chuck 2, and move the three-jaw chuck 2 to clamp the brake cylinder 3 to be ground with the insulating chuck 7;

[0028] S2, adjust the moving mechanism 5, move it until the graphite tube 64 on the electrolysis mechanism 6 is coaxial with the three-jaw chuck 2, extend the graphite tube 64 into the brake cylinder 3 to be ground, and the conductive sheet 65 contacts the brake cylinder 3 to be ground;

[0029] S3, the three-jaw chuck 2 rotates, the peristaltic pump 62 is started, and the electrolyte flows into the brake cylinder 3 to be ground through the graphite tube 64;

[0030] S4, starting the power supply 61, the inner circumferential surface of the brake cylinder 3 to be ground begins to undergo a replacement reaction to form a passivation film;

[0031] S5, turn off the power supply 61, stop the three-jaw chuck 2 from rotating, adjust the moving mechanism 5, separate the graphite tube 64 from the brake cylinder 3 to be ground, move the rotating shaft 44 to the coaxial line with the three-jaw chuck 2, and extend the polishing wheel 45 into the brake cylinder 3 to be ground;

[0032] S6, start the ultrasonic vibration grinding mechanism 4 to complete the grinding of the inside of the brake cylinder 3 to be ground.

[0033] With such a configuration, the insulating chuck 7 can be set to ensure that the current will not flow through the three-jaw chuck 2 to reduce the efficiency after the power supply 61 is turned on, thereby ensuring the electrolysis efficiency. Through the graphite tube 64 and the conductive sheet 65, when the graphite tube 64 extends into the brake cylinder 3, the conductive sheet 65 contacts the brake cylinder 3. At this time, the power supply 61-graphite tube 64-electrolyte-brake cylinder 3-conductive sheet 65 forms a current loop, and there is no need for the staff to manually connect the positive and negative electrodes of the power supply 61, thereby improving the automation of the equipment. Through the rotating three-jaw chuck 2, the electrolyte can be brought into contact with various places on the inner circumference of the brake cylinder 3, so that a substitution reaction occurs evenly on the inner circumference. Through the substitution reaction, a passivation film with a hardness lower than that of the brake cylinder 3 is formed on the inner circumference of the brake cylinder 3, which is convenient for subsequent grinding and improves the overall grinding efficiency.

[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for grinding a brake cylinder, comprising a body (1), a three-jaw chuck (2) being arranged on the body (1), a moving mechanism (5) being movable on a horizontal plane being arranged on the body (1), an ultrasonic vibration grinding mechanism (4) being arranged on the upper end surface of the moving mechanism (5), characterized in that: The three-jaw chuck (2) is provided with an insulating clamp (7) for clamping the brake cylinder (3) to be ground. An electrolytic mechanism (6) is also provided. The electrolytic mechanism (6) is arranged on the upper end surface of the moving mechanism (5). The electrolytic mechanism (6) can contact the brake cylinder (3) to be ground.

2. The device for grinding a brake cylinder according to claim 1, characterized in that: The electrolysis mechanism (6) comprises a power source (61) and a peristaltic pump (62), one end of the peristaltic pump (62) is connected to a storage tank (63) for storing electrolyte, the power source (61), the peristaltic pump (62) and the storage tank (63) are all fixedly mounted on the moving mechanism (5), the other end of the peristaltic pump (62) is connected to a graphite tube (64) arranged in a hollow interior, the graphite tube (64) is fixedly mounted on the moving mechanism (5), a first rubber sleeve (8) is arranged between the graphite tube (64) and the moving mechanism (5), One end of the graphite tube (64) can be extended into the interior of the brake cylinder (3) to be ground, and the other end of the graphite tube (64) is connected to the negative electrode of the power supply (61). The electrolysis mechanism (6) also includes a conductive sheet (65), which is fixed on the moving mechanism (5). A second rubber sleeve (9) is arranged between the conductive sheet (65) and the moving mechanism (5). One end of the conductive sheet (65) is connected to the positive electrode of the power supply (61), and the other end of the conductive sheet (65) can abut against the brake cylinder (3) to be ground.

3. The device for grinding a brake cylinder according to claim 2, characterized in that: The ultrasonic vibration grinding mechanism (4) comprises an ultrasonic generator (41), the ultrasonic generator (41) is fixedly arranged on the moving mechanism (5), one end of the ultrasonic generator (41) is connected to a transducer (42), one end of the transducer (42) away from the ultrasonic generator (41) is connected to a variable amplitude rod (43), the variable amplitude rod (43) is connected to a rotating shaft (44), one end of the rotating shaft (44) away from the variable amplitude rod (43) is provided with a polishing wheel (45), and the polishing wheel (45) can extend into the interior of the brake cylinder (3) to be ground.

4. The device for grinding a brake cylinder according to claim 3, characterized in that: The body (1) is provided with a first slide rail (11), the length direction of the first slide rail (11) is parallel to the axis of the three-jaw chuck (2), the moving mechanism (5) comprises a first slide table (51), the lower part of the first slide table (51) is provided with a first slide groove (511), the first slide groove (511) is sleeved on the first slide rail (11), the moving mechanism (5) further comprises a first motor (52), the first motor (52) is fixedly arranged on the body (1), the output shaft of the first motor (52) is connected with a first lead screw (53), the first slide table (51) is provided with a first through groove (512), and a first nut sleeved with the first lead screw (53) is arranged in the first through groove (512).

5. The device for grinding a brake cylinder according to claim 4, characterized in that: A second slide rail is arranged on the upper end surface of the first slide table (51), the length direction of the second slide rail is parallel to the horizontal plane and perpendicular to the length direction of the first slide rail (11), the moving mechanism (5) also includes a second slide table (54), a second slide groove is arranged at the lower part of the second slide table (54), the second slide groove is sleeved on the second slide rail, the moving mechanism (5) also includes a second motor (55), the second motor (55) is fixed on the first slide table (51), the output shaft of the second motor (55) is connected to the second lead screw, the second slide table (54) is provided with a second through slot, and a second nut sleeved with the second lead screw is arranged in the second through slot.

6. The device for grinding a brake cylinder according to claim 5, characterized in that: The electrolysis mechanism (6) and the ultrasonic vibration grinding mechanism (4) are both fixedly arranged on the upper end surface of the second slide table (54).

7. The device for grinding a brake cylinder according to claim 6, characterized in that: The axis of the graphite tube (64), the axis of the rotating shaft (44) and the axis of the three-jaw chuck (2) are all arranged in parallel on the same horizontal plane.

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