CN114770307A

CN114770307A - Carbon brush end face arc grinding machine

Info

Publication number: CN114770307A
Application number: CN202210463486.7A
Authority: CN
Inventors: 王贺彬
Original assignee: Anhui Hengsheng Hardware Mechanical And Electrical Products Co ltd
Current assignee: Anhui Hengsheng Hardware Mechanical And Electrical Products Co ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-07-22
Anticipated expiration: 2042-04-29
Also published as: CN114770307B

Abstract

The invention relates to the technical field of carbon brush processing equipment, and particularly discloses an arc grinding machine for an end face of a carbon brush, which comprises a machine case and a processing platform, wherein a feeding track groove is formed in the processing platform, a carbon brush block clamping and pushing assembly moving back and forth is arranged on the processing platform, an abrasive belt grinding device is arranged on the processing platform and comprises a reducing abrasive belt roller and a sizing abrasive belt roller which are arranged on the processing platform in a front-back mode, a grinding abrasive belt is arranged between the reducing abrasive belt roller and the sizing abrasive belt roller, a dust hood is arranged between the reducing abrasive belt roller and the sizing abrasive belt roller, a cleaning roller is rotatably arranged in the dust hood, and a large number of brush wires which are in contact with the grinding abrasive belt are arranged on a roller body of the cleaning roller; the carbon brush end face arc grinding machine greatly improves the processing efficiency of the carbon brush blocks, can effectively avoid the influence on the subsequent grinding efficiency of the carbon brush blocks caused by carbon powder on the surface of the abrasive belt, and finally effectively realizes the online adjustment of the arc grinding of the carbon brush blocks with different size requirements.

Description

Carbon brush end face arc grinding machine

Technical Field

The invention relates to the technical field of carbon brush processing equipment, and particularly discloses an arc grinding machine for an end face of a carbon brush.

Background

Carbon brushes, also known as brushes, are widely used as a sliding contact in many electrical devices. In the preparation process of the carbon brush, the end face of the carbon brush which is formed by pressing needs to be polished into an arc-shaped face matched with the collecting ring, and the proportion of the contact surface between the arc-shaped end face of the carbon brush and the collecting ring is not less than 75% of the arc-shaped face of the carbon brush.

The utility model discloses an application number is 201120131512.3's utility model discloses a carbon brush running-in machine, including motor, carbon brush, the motor passes through transmission and connects the emery wheel and rotate, and the emery wheel contacts with the carbon brush, and the carbon brush is installed in the carbon brush box, and the carbon brush box sets up on the carbon brush frame, and the carbon brush frame is fixed according to the central axis adjustment. The utility model discloses a carbon brush running-in machine contacts the realization through the emery wheel with carbon brush terminal surface and high-speed rotation and polishes the carbon brush terminal surface, but this type's carbon brush running-in machine has some not enough in the use. Firstly, in the process that the carbon brush is in contact with the grinding wheel for grinding, carbon powder falling from the carbon brush is easy to stick to the grinding wheel under the action of extrusion force, and the carbon powder has good lubricity, so that the subsequent grinding wheel has poor grinding effect on the carbon brush; secondly, each grinding wheel of the carbon brush running-in machine can only process one carbon brush, so that the processing efficiency of the carbon brush is severely limited; third, the carbon brush running-in machine of this type can only process out the arc contact surface of unidimensional on the carbon brush terminal surface, and need be according to the model demand of the different products of customer at the production process of carbon brush, need process into the arc contact surface of equidimension not with the carbon brush terminal surface, to this problem, can only shut down and change the emery wheel that corresponds the size, and it is changed the emery wheel not only the operation complicacy, shuts down moreover and changes also can influence the machining efficiency to the carbon brush to a certain extent. Consequently, not enough to the above-mentioned of current carbon brush running-in machine, this application has provided one kind can carry out batch processing to the carbon brush, can also cut off the carbon brush terminal surface arc grinding machine to corresponding arcwall face size according to the product model difference fast simultaneously.

Disclosure of Invention

The invention aims to design an arc grinding machine for end faces of carbon brushes, which can process the carbon brushes in batches and can quickly cut off the carbon brushes to the size of a corresponding arc-shaped face according to different product models, aiming at three defects of the existing wheel type running-in machine for running-in carbon brushes in the background technology.

The invention is realized by the following technical scheme:

an arc grinding machine for end faces of carbon brushes comprises a machine box and a machining platform arranged at the upper end of the machine box, wherein a feeding track groove is formed in the machining platform, the middle part of the feeding track groove is arranged in a disconnected mode, a carbon brush block clamping and pushing assembly moving back and forth is arranged at the disconnected position of the feeding track groove, and an abrasive belt grinding device is arranged on the machining platform behind the carbon brush block clamping and pushing assembly;

the abrasive belt grinding device comprises a reducing abrasive belt roller and a sizing abrasive belt roller which are arranged on a processing platform in the front-back mode, a grinding abrasive belt is arranged between the reducing abrasive belt roller and the sizing abrasive belt roller, a dust hood is arranged on the processing platform between the reducing abrasive belt roller and the sizing abrasive belt roller, the lower end of the grinding abrasive belt penetrates through the dust hood, a cleaning roller is arranged in the dust hood in a rotating mode, and a large number of brush wires which are in contact with the grinding abrasive belt are arranged on a roller body of the cleaning roller.

As a specific arrangement of the scheme, a fixed roller seat and a movable roller seat are arranged on the processing platform, an adjusting cylinder used for pushing the movable roller seat to move back and forth is arranged on the processing platform, the reducing abrasive belt roller is rotatably arranged on the fixed roller seat, and the sizing abrasive belt roller is rotatably arranged on the movable roller seat.

As the concrete setting of above-mentioned scheme, the reducing sand belt roller includes that the shaft that cavity set up establishes the variable diameter roller shell on the shaft with the cover, but the variable diameter roller shell is by steel sheet bending, but the equal interval connection of butt joint end of variable diameter roller shell has a plurality of arcs, and the equal dislocation of arc on the variable diameter roller shell both ends is to inserting the setting, be the bar mouth that a plurality of edges shaft axis direction set up that sets up that appears on the shaft ring array form, be provided with the board that rises of outwardly extending or inward contraction in the bar mouth, the outer end of the board that rises is provided with the laminating strip with variable diameter roller shell inner wall looks butt.

According to the specific arrangement of the scheme, the inner end of the expansion strip plate is provided with an inclined smooth inclined surface, a circular truncated cone-shaped pushing roller is concentrically arranged in an inner cavity of the roller body, the roller body of the pushing roller is abutted to the smooth inclined surface, a reducing cylinder for realizing the movement of the pushing roller along the central axis direction is arranged on the machining platform, and a retraction spring is connected between the attachment strip and the roller body.

As a further arrangement of the scheme, the inner surface and the outer surface of the variable-diameter roller sleeve are both provided with anti-skid grains or rough layers for increasing friction force.

The diameter-variable abrasive belt roller pushes the circular truncated cone-shaped pushing roller to move axially in the hollow inner cavity of the roller body through the diameter-variable air cylinder, the roller body of the pushing roller is in contact with the smooth inclined surfaces at the inner ends of the expansion slats in the axial movement process of the pushing roller, so that the plurality of expansion slats are synchronously pushed to open outwards, and then the attaching strips expand the elastic diameter-variable roller sleeve, so that the outer diameter of the roller sleeve is gradually increased, and the effect of adjusting the diameter-variable abrasive belt roller is achieved. In the process of reducing the diameter of the diameter-reducing abrasive belt roller, the adjusting cylinder is also controlled to push the movable roller seat to move back and forth, so that the polishing abrasive belt is kept in a stretched straight state all the time, and the sliding of the polishing abrasive belt on the carbon brush block is reduced.

As a further arrangement of the above scheme, one end of the feeding track groove is connected with a feeding track groove, the chassis is further provided with a pushing cylinder, and the end part of the pushing cylinder is connected with a pushing block extending into the end part of the feeding track groove; the carbon brush block feeding device is connected with an external vibration feeding disc through the feeding rail groove for feeding, then the carbon brush blocks are pushed to the position of the carbon brush block clamping pushing assembly under the action of the pushing cylinder when entering the feeding rail groove from the feeding rail groove, in addition, a related computing sensor can be arranged for counting the pushed carbon brush blocks, and when the set number is reached, the pushing cylinder directly stretches to the longest length to push all the carbon brush blocks into the carbon brush block clamping pushing assembly together for arc-shaped end face running-in processing.

As a specific configuration of the above scheme, the carbon brush block clamping and pushing assembly includes a C-shaped clamping seat arranged to move back and forth, two ends of the C-shaped clamping seat are connected to two ends of a disconnection position of the feeding rail groove, a pressing cylinder is arranged on an upper surface of the C-shaped clamping seat, a pressing plate connected to the pressing cylinder is arranged in the C-shaped clamping seat, and a telescopic pushing device for realizing back and forth movement of the C-shaped clamping seat is further arranged on the machining platform; above-mentioned structure sets up to a concrete design mode of carbon brush piece centre gripping promotion subassembly, thereby the effect through pushing down the cylinder pushes down the pressure strip downwards and presss from both sides tightly one row of carbon brush piece, pushes gradually towards abrasive band grinding device department with C type grip slipper by flexible thrust unit after pressing from both sides tightly again to accomplish the running-in processing to carbon brush piece.

As a further arrangement of the above scheme, a negative pressure fan is arranged outside the case, and the air exhaust end of the negative pressure fan is connected with the lower end of the dust hood; the carbon powder cleaned up is effectively absorbed and recovered under the action of the negative pressure fan, and pollution caused by diffusion in the air is prevented.

As a further arrangement of the above scheme, a hood is detachably mounted at the upper end of the case; the hood can separate all the parts on the processing platform from the outside, so that carbon powder is prevented from being diffused in the air in the processing process, and the cleanness of the workshop environment is effectively guaranteed.

Has the advantages that:

1) the carbon brush end face arc grinding machine disclosed by the invention can clamp a row of carbon brush blocks each time through the arranged carbon brush block clamping and pushing assembly, the carbon brush blocks are gradually pushed to the abrasive belt grinding device after being clamped, the arc grinding process of the end faces of the carbon brush blocks is finished through the abrasive belt running at a high speed, and the processing efficiency of the carbon brush blocks is greatly improved.

2) The carbon brush end face arc grinding machine is also provided with the dust hood, the abrasive belt penetrates through the dust hood, the cleaning roller is arranged in the dust hood, a large number of brush wires are arranged on the cleaning roller, when the abrasive belt enters the dust hood, the brush wires can act on the abrasive belt, carbon powder adhered to the abrasive belt is effectively brushed down, and the subsequent grinding efficiency of a carbon brush block can be effectively prevented from being influenced by the carbon powder on the surface of the abrasive belt; in addition, the carbon powder brushed down is recovered under the action of negative pressure dust absorption, so that the workshop environment is prevented from being polluted.

3) The abrasive belt grinding device provided by the invention adopts the sizing abrasive belt roller and the reducing abrasive belt roller, when the carbon brush blocks with different size requirements need to be subjected to arc grinding, the reducing abrasive belt roller can be controlled to adjust to the corresponding roller diameter and then subjected to running-in processing, the abrasive belt roller does not need to be stopped and replaced in the whole process, only the extension or the shortening of the reducing air cylinder needs to be controlled, the online adjustment of the arc grinding of the carbon brush blocks with different size requirements is effectively realized, and the reducing abrasive belt roller is novel in structural design and excellent in use effect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a perspective view of the present invention with the hood removed;

FIG. 3 is a first angle perspective structural view of a carbon brush block conveying mechanism, a belt sanding device and the like in the present invention;

FIG. 4 is a second angle perspective structural view of a carbon brush block conveying mechanism, an abrasive belt grinding device and the like in the present invention;

FIG. 5 is a perspective view of the C-shaped holder and the retractable pushing device of the present invention;

FIG. 6 is a schematic view of the inner plane structure of the sanding belt, the dust hood and the like in the present invention;

FIG. 7 is a schematic view of the inner plane structure of the reducing belt roller in this embodiment 3;

FIG. 8 is a schematic perspective view of the roller body and the bonding strip in this embodiment 3;

fig. 9 is a schematic perspective view of the variable diameter roll sleeve of the embodiment 3.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to the accompanying drawings 1 to 9, in conjunction with the embodiments.

Example 1

Embodiment 1 discloses an arc grinding machine for batch processing of carbon brush end faces, and referring to fig. 1 and fig. 2, the main body of the arc grinding machine comprises a machine case 1, a machine cover 2, a carbon brush block conveying mechanism 3 and an abrasive belt grinding device 4. The hood 2 is detachably mounted at the upper end of the case 1, the lower surface of the case 1 is connected with a plurality of support legs, and the front side face of the case 1 is provided with a control box 5 for controlling all electric devices.

Referring to fig. 3 and 4, a processing platform 6 is arranged on the upper surface of the case 1, the carbon brush block conveying mechanism 3 is arranged on the processing platform 6, the carbon brush block conveying mechanism 3 is longitudinally arranged in the feeding rail groove 301 in the specific setting process, one end of the feeding rail groove 301 extends out of the hood 2 to be connected with an external vibration feeding machine, the other end of the feeding rail groove is connected with a feeding rail groove 302 transversely arranged on the processing platform 6, meanwhile, the two ends of the feeding rail groove 302 all extend out of the hood 2, one end of the pushing machine is used for pushing materials, and the other end of the pushing machine is used for discharging materials. A material pushing cylinder 303 is fixedly installed on the outer side of the chassis 1, a material pushing block extending into one end of the feeding rail groove 302 is connected to the end of a piston rod of the material pushing cylinder 303, and the carbon brush block on one feeding rail 301 can be pushed to feed along the direction of the carbon brush block at a time under the action of the material pushing cylinder 303. In addition, in order to count the number of carbon brush blocks fed into the feeding rail 301 in the feeding rail groove 301, a counting sensor (not shown) provided opposite to the feeding rail groove 301 is further installed on the hood 2.

Referring to fig. 4 and 5, belt sander 4 is disposed on machining table 6 behind feed rail groove 302, and the portion where feed rail groove 302 is aligned with belt sander 4 is broken. A C-shaped clamp base 304 is disposed at the disconnected position of the feeding rail groove 302, and two ends of the C-shaped clamp base 304 are engaged with two sections of the feeding rail groove 302. A pressing cylinder 305 is arranged on the upper surface of the C-shaped clamping block 304, a pressing plate 306 is connected to the lower end of the pressing cylinder 305, and when the carbon brush blocks in the feeding rail groove 302 are pushed into the C-shaped clamping block 304, the carbon brush blocks can be clamped and fixed through the action of the pressing cylinder 305 and the pressing plate 306. The upper surface of the processing platform 6 at the front side of the C-shaped clamping seat 304 is fixedly provided with a telescopic pushing device 307, the telescopic pushing device can be one of an air cylinder, a hydraulic cylinder or an electric push rod, the end part of the telescopic pushing device is connected with the C-shaped clamping seat 304, the C-shaped clamping seat 304 clamping the carbon brush block is pushed towards one side of the abrasive belt grinding device 4 through the extension action of the telescopic pushing device 307, and therefore the end face of the carbon brush block is in contact with the grinding device 4 to be aligned for arc grinding processing. In addition, in order to ensure that the C-shaped clamping seat 304 can stably advance without deviation, a sliding block 308 is further arranged on the lower surface of the C-shaped clamping block 304, and a first sliding rail 309 matched with the sliding block 308 is fixed on the upper surface of the processing platform 6.

Referring to fig. 3 and 4, the abrasive belt polishing apparatus 4 in this embodiment includes roller bases 401 fixedly disposed on the processing platform 6 from front to back, abrasive belt driving rollers 402 are rotatably disposed in both of the roller bases 401, a straight polishing abrasive belt 403 is disposed between the two abrasive belt driving rollers 402, a driving motor 404 for driving the abrasive belt driving rollers 402 is disposed on the roller base 401 at the rear side, the polishing abrasive belt 403 is driven to rotate around the two abrasive belt driving rollers 402 by the driving motor 404, and then the end surface of the carbon brush block contacts with the polishing abrasive belt 403 on the front abrasive belt driving roller 402, so as to achieve arc polishing of the front side surface of the carbon brush block.

Example 2

Embodiment 2 discloses an arc grinding machine for end faces of carbon brushes, which is improved on the basis of embodiment 1, and the improved point of embodiment 2 mainly aims at the problem that graphite powder can be adhered to the outer surface of a grinding abrasive belt 403 when the grinding abrasive belt 403 carries out arc grinding processing on carbon brushes, so that the grinding abrasive belt 403 has poor arc grinding processing effect on the end faces of subsequent carbon brushes.

In this embodiment 2, the same parts as those in embodiment 1 are not described again, and the difference is as shown in fig. 2, fig. 4 and fig. 6, in this embodiment 2, a dust hood 7 is installed on the processing platform 6, and both side surfaces of the dust hood 7 are provided with through holes, so that the lower part of the sanding belt 403 can penetrate through the dust hood 7. Meanwhile, a cleaning motor 701 is arranged on the outer side surface of the dust hood 7, the end part of an output shaft of the cleaning motor 701, which extends into the dust hood 7, is connected with a cleaning roller 702, a large number of brush wires 703 are arranged on the roller body of the cleaning roller 702, the brush wires 703 are in contact with the lower surface of a polishing abrasive belt 403, which extends into the dust hood 7, and the lower surface of the polishing abrasive belt 403 is cleaned through the rotating cleaning roller 702 and the brush wires 703, so that the graphite powder adhered to the polishing abrasive belt 403 is effectively brushed down, and the subsequent arc grinding process of the carbon brush blocks is not affected.

Meanwhile, a negative pressure fan 8 is arranged outside the case 1, the air exhaust end of the negative pressure fan 8 extends into the case 1 and is connected with the lower end of the dust hood 7, the air outlet end of the negative pressure fan 8 is connected with an external dust removal filtering device (not shown in the figure), and the carbon powder brushed down is pumped into the dust removal filtering device under the action of the negative pressure fan 8 to be collected, so that the influence of the carbon powder on the air environment is reduced.

Example 3

Embodiment 3 discloses an arc grinding machine for carbon brush end faces, which is improved based on embodiment 1, and is designed to overcome the defect that the existing arc grinding machine for carbon brush end faces needs to be stopped to replace grinding wheels with different diameters when the existing arc grinding machine for carbon brush end faces of different models is used for machining the carbon brush end faces.

In this embodiment 3, the same points as those in embodiment 1 are not described again, and the difference is shown in fig. 4, fig. 7, fig. 8 and fig. 9, where the belt sander 4 in this embodiment 3 includes a fixed roller base 405 and a movable roller base 406, where the fixed roller base 405 is disposed on a side close to the C-shaped clamping base 304, the movable roller base 406 is disposed on a side away from the C-shaped clamping base 304, an adjusting cylinder 407 is fixedly mounted on the processing platform 6, and a piston rod end of the adjusting cylinder 407 is connected to the movable roller base 406, the movable roller base 406 is pushed to advance or retreat toward the fixed roller base 405 by extension or contraction of the adjusting cylinder 407, and at the same time, in order to ensure stability of the movable roller base 406 during movement, a sliding slot is formed at a lower end of the movable roller base 406, and a second sliding rail 408 matched with the sliding slot is fixedly disposed on the processing platform 6.

A sizing belt roller 409 is provided in the movable roller holder 406, and a drive motor 404 is provided on the movable roller holder 406 for driving the sizing belt roller 409 in rotation. A reducing belt roller 410 is arranged on the fixed roller seat 405, and a sanding belt 403 is arranged between the sizing belt roller 409 and the reducing belt roller 410. In specific arrangement, the reducing belt roller 410 comprises a hollow roller body 4101, a variable diameter roller sleeve 4102 is sleeved on the periphery of the roller body 4101, the variable diameter roller sleeve 4102 is formed by bending a steel plate, and anti-slip grains or rough layers for increasing friction force are arranged on the inner surface and the outer surface of the variable diameter roller sleeve 4102, so that the sanding belt 403 cannot slide when being covered on the variable diameter roller sleeve 4102. A plurality of arc strips 4103 are connected to two opposite ends of the variable diameter roll sleeve 4102 at intervals, and the arc strips 4103 on the two ends of the variable diameter roll sleeve 4102 are arranged in a staggered and opposite insertion manner, so that a complete circular surface is formed. A plurality of strip-shaped openings arranged along the axial direction of the roller body are formed in the roller body 4101 in an annular array shape, a strip expansion plate 4104 is arranged in each strip-shaped opening, a joint strip 4105 abutted against the inner wall of the variable-diameter roller sleeve 4102 is arranged at the outer end of each strip expansion plate 4104, and a spring 4106 is arranged between the inner side surface of each joint strip 4105 and the roller body 4101. The inner end of each strip expansion plate 4104 is provided with a high and low bevel, and the inner end surface of the strip expansion plate 4104 is provided with a smooth wear-resistant layer 4107, and the smooth wear-resistant layer 4107 may be made of metallic copper. A truncated cone-shaped pusher roll 4108 is coaxially disposed in the hollow inner cavity of the roll body 4101, and the angle of the inclined surface of the roll body of the pusher roll 4108 is the same as that of the inner end of the rising strip plate 4104. A hollow roll shaft 4109 is arranged at one end of the roll body 4101, a push rod 4110 extending through the hollow roll shaft 4109 is connected to the push roll 4108, and a reducing cylinder 4111 connected with the outer end of the push rod is fixedly arranged on the processing platform 6, although the reducing cylinder 4111 can be replaced by a hydraulic cylinder.

When the carbon brush end face arc grinding machine disclosed in this embodiment 3 needs to adjust the arc grinding size of the carbon brush end face, the extension or the shortening of the reducing cylinder 4111 is controlled to drive the pushing roller 4108 to move along the central axis of the roller body 4101, then the pushing roller 4108 pushes all the expansion slats 4104 to synchronously expand outwards or synchronously contract inwards under the action of the spring, and meanwhile, since the reducing roller sleeve 4102 has elasticity, the diameter of the expansion slats 4104 is synchronously expanded or contracted, at the moment, the movable roller seat 406 is pushed to move by controlling the adjusting cylinder 407, so that the whole grinding belt 403 is always stretched and directly wound between the sizing belt roller 409 and the reducing belt roller 410, the reducing process of the reducing belt roller 410 is realized, and the coding belt 403 can grind arc faces of carbon brush blocks with different sizes.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An arc grinding machine for end faces of carbon brushes comprises a machine box and a processing platform arranged at the upper end of the machine box, and is characterized in that a feeding track groove is formed in the processing platform, the middle part of the feeding track groove is disconnected, a carbon brush block clamping and pushing assembly moving back and forth is arranged at the disconnection position of the feeding track groove, and an abrasive belt grinding device is arranged on the processing platform behind the carbon brush block clamping and pushing assembly;

the abrasive belt polishing device comprises a reducing abrasive belt roller and a sizing abrasive belt roller which are arranged on a processing platform in the front-back direction, a polishing abrasive belt is arranged between the reducing abrasive belt roller and the sizing abrasive belt roller, a dust hood is arranged on the processing platform between the reducing abrasive belt roller and the sizing abrasive belt roller, the lower end of the polishing abrasive belt penetrates through the dust hood, a cleaning roller is rotatably arranged in the dust hood, and a large number of brush wires which are in contact with the polishing abrasive belt are arranged on a roller body of the cleaning roller.

2. The carbon brush end face arc grinding machine according to claim 1, wherein the processing platform is provided with a fixed roller seat and a movable roller seat, the processing platform is provided with an adjusting cylinder for pushing the movable roller seat to move back and forth, the reducing abrasive belt roller is rotatably arranged on the fixed roller seat, and the sizing abrasive belt roller is rotatably arranged on the movable roller seat.

3. The carbon brush end face arc grinding machine according to claim 2, wherein the reducing abrasive belt roller comprises a hollow roller body and a variable diameter roller sleeve, the variable diameter roller sleeve is sleeved on the roller body and is formed by bending a steel plate, a plurality of arc-shaped strips are connected to two abutting ends of the variable diameter roller sleeve at intervals, the arc-shaped strips at two ends of the variable diameter roller sleeve are arranged in a staggered and opposite insertion mode, a plurality of strip-shaped openings are formed in the roller body in an annular array mode and are arranged in the axial direction of the roller body, expanding strips which extend outwards or contract inwards are arranged in the strip-shaped openings, and the attaching strips abutting against the inner wall of the variable diameter roller sleeve are arranged at the outer ends of the expanding strips.

4. The carbon brush end face arc grinding machine according to claim 3, wherein an inclined smooth inclined surface is provided at an inner end of the strip expansion plate, a truncated cone-shaped pushing roller is concentrically provided in an inner cavity of the roller body, the roller body of the pushing roller abuts against the smooth inclined surface, a reducing cylinder for moving the pushing roller along the central axis direction is provided on the machining platform, and a retraction spring is connected between the attachment strip and the roller body.

5. The arc grinding machine with the carbon brush end face as claimed in claim 2 or 3, wherein the inner surface and the outer surface of the variable-diameter roller sleeve are provided with anti-skid grains or rough layers for increasing friction force.

6. The carbon brush end face arc grinding machine according to claim 1, wherein one end of the feeding rail groove is connected with a feeding rail groove, the machine case is further provided with a material pushing cylinder, and the end of the material pushing cylinder is connected with a material pushing block extending into the end of the feeding rail groove.

7. The carbon brush end face arc grinding machine according to claim 1, wherein the carbon brush block clamping pushing assembly includes a C-shaped clamping seat arranged to move back and forth, two ends of the C-shaped clamping seat are connected with two ends of a disconnection position of the feeding rail groove, a pressing cylinder is arranged on an upper surface of the C-shaped clamping seat, a pressing plate connected with the pressing cylinder is arranged in the C-shaped clamping seat, and a telescopic pushing device for achieving back and forth movement of the C-shaped clamping seat is further arranged on the machining platform.

8. The carbon brush end face arc grinding machine according to claim 1, wherein a negative pressure fan is disposed outside the machine case, and an air suction end of the negative pressure fan is connected with a lower end of the dust hood.

9. The carbon brush end face arc grinder of claim 1, wherein a hood is detachably mounted on an upper end of the machine case.