Clamping device for machining rear brake hub cover

Abstract

The clamping device comprises a panel, a bottom plate, a rear brake hub cover, a clamping air cylinder, a first lifting air cylinder and a second lifting air cylinder, the bottom of the panel is fixedly connected with a stand column, a clamping block is arranged at the top of the clamping air cylinder, a hand pulling valve is installed on the front side of the panel, and a center shaft hole is formed in the surface of the rear brake hub cover; the side edge of the central shaft hole is provided with a countersink end face, the surface of the rear brake hub cover is provided with a cam shaft hole, the bottom of the rear brake hub cover is provided with a positioning pin, the top of the first lifting air cylinder is provided with a positioning plate, and the top of the positioning plate is provided with a positioning block. A new clamping device is provided for clamping and fixing a rear brake hub cover workpiece at a time, multiple procedures are combined for machining, repeated clamping operation is reduced, the machining precision is improved, and the requirements of customers are met.

Description

Technical Field

[0001] The invention relates to the technical field of rear brake hub cover machining, in particular to a clamping device for machining a rear brake hub cover. Background Art

[0002] The brake hub cover is used to be installed on the wheel hub. First, it plays the role of protecting and decorating the wheel hub. Secondly, the brake hub cover is connected to the brake cable. The brake cable pulls the rocker arm to rotate, and the rotating shaft connected to the rocker arm rotates, driving the brake drum to produce displacement to decelerate and brake the wheel. The central shaft hole is the part used to be fixedly connected to the vehicle. The brake hub on the existing motorcycle is divided into a front brake hub and a rear brake hub. The front brake hub is connected to the brake handle on the handlebar through the brake cable, and the rear brake hub is connected to the foot brake handle through the brake cable.

[0003] During the production and processing of the rear brake hub cover, after the rear brake hub cover is die-cast, it needs to be machined by mechanical processing to meet the technical requirements such as processing size. Machining is divided into multiple processes, such as center shaft hole (D15 hole) processing, camshaft hole (D14 hole) processing and countersinking end surface processing, etc., generally using discontinuous operation, each process The equipment and tooling used are different. During operation, the operator clamps the workpiece on the corresponding tooling and processing equipment according to the processing procedure. Repeated clamping and repeated positioning are required during the processing process, which is not only time-consuming and labor-intensive and affects the progress of the operation, but also repeated clamping is prone to cumulative errors. The product processing accuracy does not meet the technical requirements, and the unstable quality is easily subject to customer complaints. Summary of the invention

[0004] The present invention aims to solve the problems existing in the above-mentioned prior art and provides a clamping device for machining a rear brake hub cover. The present invention can provide a new clamping device to complete the clamping and fixing of the rear brake hub cover workpiece at one time, and combine multiple processes for processing, thereby reducing repeated clamping operations, saving time and manpower, and improving the processing accuracy of the workpiece to meet customer requirements. The processing efficiency and product quality are further improved. At the same time, the device has high versatility and is easy to promote and use within the company and within the industry.

[0005] The present invention solves the technical problem by adopting a technical solution: the clamping device for machining the rear brake hub cover comprises a panel, a bottom plate, a rear brake hub cover, a clamping cylinder, a first lifting cylinder and a second lifting cylinder. The bottom of the panel is fixedly connected with a column, there are multiple columns, and the multiple columns are connected to the bottom plate. The bottom plate is installed on a movable platform in a machine tool. The clamping cylinder is installed at the bottom of the panel. A clamping block is arranged on the top of the clamping cylinder. There are three clamping cylinders and three clamping blocks respectively. The rear brake hub cover is placed on the top of the panel. The three clamping blocks clamp the top surface of the rear brake hub cover at the same time. A hand-pull valve is installed on the front side of the panel. The hand-pull valve controls the clamping cylinder, the first lifting cylinder and the second lifting cylinder at the same time through a pipeline and a throttle valve.

[0006] The surface of the rear brake hub cover is provided with a central axis hole, a countersunk end face is provided on the side of the central axis hole, a convex column is fixedly connected to the surface of the rear brake hub cover, a camshaft hole is provided on the surface of the rear brake hub cover, the camshaft hole is inside the convex column, a countersunk end face is also provided on the bottom of the rear brake hub cover, the countersunk end face is outside the camshaft hole, a positioning pin is provided on the bottom of the rear brake hub cover, the first lifting cylinder and the second lifting cylinder are installed on the top of the base plate, a positioning clamping assembly is provided on the top of the base plate, a positioning plate is installed on the top of the first lifting cylinder, a positioning block is provided on the top of the positioning plate, and a positioning pin is provided on the side of the panel. A fixed block is installed on the side, a movable bolt is inserted inside the panel, a movable block is arranged at the end of the movable bolt, a slide groove is provided at the bottom of the panel, the movable block is inside the slide groove, a compression spring is sleeved on the side surface of the movable bolt, the compression spring is outside the fixed block, there are two movable blocks, the positioning block abuts against the bottom of the two movable blocks, a clamping groove is provided on the inner side of the movable block, the two movable blocks clamp the positioning pin through the clamping groove, and the first lifting cylinder, the positioning plate, the positioning block, the fixed block, the movable bolt, the movable block, the compression spring and the clamping groove constitute a positioning clamping assembly;

[0007] A floating pin is arranged on the top of the second lifting cylinder, and the floating pin reaches the inside of the camshaft hole. A double-rod cylinder is installed at the bottom of the panel, and a clamping plate is installed on the top of the double-rod cylinder. An arc groove is opened on the side of the clamping plate, and the arc groove abuts against the side surface of the convex column.

[0008] The rear brake hub cover to be processed is placed at the corresponding position on the top of the panel, the locating pin at the bottom of the rear brake hub cover reaches between the two movable blocks, the camshaft hole of the rear brake hub cover and the floating pin are plugged into each other, and after the positioning and placement of the brake hub cover is completed, the operator operates the hand-pull valve, the air flow passes through multiple pipelines and multiple throttle valves, the first lifting cylinder extends and runs, the piston rod of the first lifting cylinder abuts the positioning plate, the positioning plate and the positioning block move upward, the positioning block abuts the two movable blocks, the two movable blocks move closer to each other, the two clamping grooves reach the side surfaces of the locating pin, and the locating pin is clamped, the three clamping cylinders run at the same time, the three clamping blocks clamp the top surface of the rear brake hub cover at the same time, the double-rod cylinder retracts and runs, the clamping plate moves toward the rear brake hub cover, the arc groove of the clamping plate abuts the side surface of the convex column, and the overall clamping and fixing of the rear brake hub cover is realized, the second lifting cylinder retracts and runs, the piston rod of the second lifting cylinder drives the floating pin to move downward, and the floating pin is away from the rear brake hub cover, the machine tool equipment is turned on and the rear brake hub cover is on the same equipment and the same tooling The center shaft hole, camshaft hole and countersunk end face are automatically processed in sequence. After the rear brake hub cover is processed, the relevant tools return to their positions, the machine tool equipment is suspended, and the operator operates the hand valve. The second lifting cylinder extends and runs, driving the floating pin to rise, and the double-rod cylinder extends and runs, driving the clamping plate to move away from the rear brake hub cover. The first lifting cylinder contracts and runs, driving the positioning plate and the positioning block to move downward, and the two movable blocks are released. The elastic force of the two compression springs makes the two movable blocks move away from the positioning pin, and the positioning pin is loosened. The three clamping cylinders run at the same time, and the three clamping blocks open and move away from the top surface of the rear brake hub cover. The operator easily takes out the rear brake hub cover product. The whole process provides a new clamping device to clamp and fix the rear brake hub cover workpiece at one time, and multiple processes are combined for processing, which reduces repeated clamping operations, saves time and manpower, and improves the processing accuracy of the workpiece to meet customer requirements. The processing efficiency and product quality are further improved. At the same time, the device has high versatility and is easy to promote and use within the company and the industry.

[0009] In order to further improve it, a first through hole is opened on the panel surface, a second through hole is opened on the panel surface, and a third through hole is opened on the panel surface. The clamping block and the clamping cylinder move in the first through hole, the positioning pin passes through the second through hole, and the floating pin passes through the third through hole. The first through hole, the second through hole and the third through hole provide effective activity space.

[0010] For further improvement, a V-shaped groove surface is arranged on the inner side of the positioning block, and a V-shaped inclined surface is formed on the outer sides of the two movable blocks. The arrangement of the V-shaped groove surface and the V-shaped inclined surface enables the two movable blocks to stably reach the inner side of the positioning block, thereby reducing errors and improving accuracy.

[0011] To further improve, a positioning boss is provided on the top of the panel, and there are multiple positioning bosses. The rear brake hub cover is placed on the top of the multiple positioning bosses. There is a step on the inner side of the positioning boss, and the step supports the outer edge of the rear brake hub cover. The multiple positioning bosses further limit the rear brake hub cover, thereby reducing the alignment operation and alignment time of the rear brake hub cover during the placement process and improving the operating efficiency.

[0012] For further improvement, an inner groove is opened on the side of the panel, and the fixing block is installed inside the inner groove, which saves space while the movable bolt and the compression spring are effectively protected inside the inner groove, reducing unnecessary contact with the outside.

[0013] For further improvement, an optical axis is fixedly connected to the top of the base plate, the top of the optical axis is connected to the panel, a linear bearing is installed inside the positioning plate, the optical axis is inside the linear bearing, there are four optical axes and four linear bearings respectively, the four optical axes interact with the four linear bearings, the positioning plate is further limited during the up and down movement, the stability is improved, and the deviation of the moving trajectory of the positioning plate and the positioning block is avoided.

[0014] To further improve, the four optical axes are evenly distributed on the left and right sides of the first lifting cylinder, the distances from the four optical axes to the first lifting cylinder are the same, the four optical axes and the four linear bearings are evenly stressed, and the service life of the components is improved.

[0015] For further improvement, a connecting plate is provided on the side of the double-rod cylinder, and a clamp is installed on the side of the connecting plate. The connecting plate realizes the installation of the clamp and ensures that the clamp moves horizontally with the double-rod cylinder, so that the clamp can support and fix the rear brake hub cover conveniently.

[0016] To further improve, an installation groove is opened on the top of the panel, a linear guide rail is installed inside the installation groove, a slider is installed on the bottom of the splint, the slider interacts with the linear guide rail, there are two sliders and two linear guide rails respectively, the two sliders interact with the two linear guide rails, the splint is further limited during its forward and backward movement to avoid deviation in the moving trajectory of the splint, and the accuracy is further improved.

[0017] The beneficial effects of the present invention are:

[0018] 1. By placing the rear brake hub cover to be processed to the corresponding position on the top of the panel, the locating pin at the bottom of the rear brake hub cover reaches between the two movable blocks, and the camshaft hole of the rear brake hub cover and the floating pin are plugged into each other. After the positioning and placement of the brake hub cover is completed, the operator operates the hand-pull valve, and the air flow passes through multiple pipelines and multiple throttle valves. The first lifting cylinder extends and runs, and the piston rod of the first lifting cylinder abuts the positioning plate, and the positioning plate and the positioning block move upward, and the positioning block abuts the two movable blocks. The two movable blocks move closer to each other, and the two clamping grooves reach the side surface of the locating pin, and the locating pin is clamped. The three clamping cylinders run at the same time, and the three clamping blocks clamp the top surface of the rear brake hub cover at the same time. The double-rod cylinder shrinks and runs, and the clamping plate moves toward the rear brake hub cover, and the arc groove of the clamping plate abuts the side surface of the convex column, so as to realize the overall clamping and fixing of the rear brake hub cover, and the second lifting cylinder shrinks and runs, and the piston rod of the second lifting cylinder drives the floating pin to move downward, and the floating pin is away from the rear brake hub cover, and the machine tool equipment is turned on for operation. The rear brake hub cover is on the same equipment and the same pair of workpieces. The center shaft hole, camshaft hole and countersunk end face are automatically processed in sequence. After the rear brake hub cover is processed, the relevant tools return to their positions, the machine tool equipment stops, the operator operates the hand valve, the second lifting cylinder extends and runs, driving the floating pin to rise, the double-rod cylinder extends and runs, driving the clamping plate away from the rear brake hub cover, the first lifting cylinder contracts and runs, driving the locating plate and the locating block to move downward, the two movable blocks are released, and the elastic force of the two compression springs makes the two movable blocks move away from the locating pin. The locating pin is loosened, and the three clamping cylinders run at the same time. The three clamping blocks open and move away from the top surface of the rear brake hub cover, and the operator easily takes out the rear brake hub cover product. The whole process provides a new clamping device to clamp and fix the rear brake hub cover workpiece at one time, and multiple processes are combined for processing, which reduces repeated clamping operations, saves time and manpower, and improves the processing accuracy of the workpiece to meet customer requirements. The processing efficiency and product quality are further improved. At the same time, the device has high versatility and is easy to promote and use within the company and the industry.

[0019] 2. Through the interaction between the four optical axes and the four linear bearings, the positioning plate is further limited during its up and down movement, and the stability is improved, avoiding deviations in the moving tracks of the positioning plate and the positioning block. The four optical axes and the four linear bearings are evenly stressed, thus increasing the service life of components.

[0020] 3. While the splint is installed through the connecting plate, it is ensured that the splint moves horizontally following the double-rod cylinder, which makes it convenient for the splint to hold and fix the rear brake hub cover. The two sliders interact with the two linear guides to further limit the splint during its forward and backward movement, avoiding deviations in the splint's moving trajectory and further improving accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 For the present invention Figure 1 Enlarged view of point B in the middle;

[0024] Figure 4 This is a top view of the clamping device of the present invention;

[0025] Figure 5 For the present invention Figure 4 Enlarged view of point C in the middle;

[0026] Figure 6 For the present invention Figure 4 Enlarged view of point D in the middle;

[0027] Figure 7 For the present invention Figure 4 Enlarged view of point E in the middle;

[0028] Figure 8 It is a diagram showing the structure of the rear brake hub cover of the present invention;

[0029] Fig. 9 A bottom view of a rear brake hub cover of the present invention;

[0030] Fig.10 It is a right side view of the structure of the present invention;

[0031] Fig.11 is a cross-sectional view of the interior of the panel of the present invention;

[0032] Fig.12 For the present invention Fig.11 Enlarged view of point F in the middle;

[0033] Fig.13 This is a diagram showing the positioning and clamping assembly of the present invention.

[0034] Explanation of the accompanying drawings: 1. panel; 2. base plate; 3. rear brake hub cover; 4. clamping cylinder; 5. first lifting cylinder; 6. second lifting cylinder; 7. column; 8. clamping block; 9. hand-pull valve; 10. center axis hole; 11. countersunk end face; 12. boss; 13. camshaft hole; 14. positioning pin; 15. positioning plate; 16. positioning block; 17. fixed block; 18. movable bolt; 19. movable block; 20. slide groove; 21. compression spring; 22. clamping groove; 23. floating pin; 24. double-rod cylinder; 25. clamping plate; 26. arc groove; 27. first through hole; 28. second through hole; 29. ​​third through hole; 30. positioning boss; 31. inner groove; 32. optical axis; 33. linear bearing; 34. connecting plate; 35. mounting groove; 36. linear guide; 37. slider. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-13 This embodiment is further described:

[0036] like Figure 1-13As shown: In this embodiment, a clamping device for machining a rear brake hub cover comprises a panel 1, a base plate 2, a rear brake hub cover 3, a clamping cylinder 4, a first lifting cylinder 5 and a second lifting cylinder 6. A column 7 is fixedly connected to the bottom of the panel 1. There are multiple columns 7, and multiple columns 7 are connected to the base plate 2. The base plate 2 is installed on a movable platform in a machine tool. The clamping cylinder 4 is installed at the bottom of the panel 1. A clamping block 8 is arranged on the top of the clamping cylinder 4. There are three clamping cylinders 4 and three clamping blocks 8 respectively. The rear brake hub cover 3 is placed on the top of the panel 1. The three clamping blocks 8 clamp the top surface of the rear brake hub cover 3 at the same time. A hand-pull valve 9 is installed on the front side of the panel 1. The hand-pull valve 9 controls the clamping cylinder 4, the first lifting cylinder 5 and the second lifting cylinder at the same time through a pipeline and a throttle valve. A lowering cylinder 6, a central axis hole 10 is provided on the surface of the rear brake hub cover 3, a countersunk end face 11 is provided on the side of the central axis hole 10, a boss 12 is fixedly connected to the surface of the rear brake hub cover 3, a camshaft hole 13 is provided on the surface of the rear brake hub cover 3, the camshaft hole 13 is inside the boss 12, a countersunk end face 11 is also provided on the bottom of the rear brake hub cover 3, the countersunk end face 11 is outside the camshaft hole 13, a locating pin 14 is provided on the bottom of the rear brake hub cover 3, the first lifting cylinder 5 and the second lifting cylinder 6 are installed on the top of the base plate 2, a positioning clamping component is provided on the top of the base plate 2, a positioning plate 15 is installed on the top of the first lifting cylinder 5, a positioning block 16 is provided on the top of the positioning plate 15, a fixing block 17 is installed on the side of the panel 1, and a movable bolt is inserted inside the panel 1 18, a movable block 19 is arranged at the end of the movable bolt 18, a slide groove 20 is arranged at the bottom of the panel 1, the movable block 19 is inside the slide groove 20, a compression spring 21 is sleeved on the side surface of the movable bolt 18, the compression spring 21 is outside the fixed block 17, there are two movable blocks 19, the positioning block 16 abuts against the bottom of the two movable blocks 19, a clamping groove 22 is arranged on the inner side of the movable block 19, and the two movable blocks 19 clamp the positioning pin 14 through the clamping groove 22. The first lifting cylinder 5, the positioning plate 15, the positioning block 16, the fixed block 17, the movable bolt 18, the movable block 19, the compression spring 21 and the clamping groove 22 constitute a positioning and clamping assembly, and a floating pin 23 is arranged on the top of the second lifting cylinder 6, and the floating pin 23 reaches the camshaft hole 1 3, a double-rod cylinder 24 is installed at the bottom of the panel 1, a clamping plate 25 is installed on the top of the double-rod cylinder 24, an arc groove 26 is opened on the side of the clamping plate 25, and the arc groove 26 abuts against the side surface of the boss 12, a first through hole 27 is opened on the surface of the panel 1, a second through hole 28 is opened on the surface of the panel 1, and a third through hole 29 is opened on the surface of the panel 1. A V-shaped groove surface is arranged on the inner side of the positioning block 16, and a V-shaped inclined surface is formed on the outer side of the two movable blocks 19. A positioning boss 30 is arranged on the top of the panel 1, and there are multiple positioning bosses 30. The rear brake hub cover 3 is placed on the top of the multiple positioning bosses 30, and the inner side of the positioning boss 30 has a step, which abuts against the outer edge of the rear brake hub cover 3. An inner groove 31 is opened on the side of the panel 1, and the fixing block 17 is installed inside the inner groove 31.

[0037] like Figure 1 , Figure 3, Figure 4 , Fig.10 , Fig.11 , Fig.12 and Fig.13 As shown: an optical axis 32 is fixedly connected to the top of the base plate 2, the top of the optical axis 32 is connected to the panel 1, a linear bearing 33 is installed inside the positioning plate 15, the optical axis 32 is inside the linear bearing 33, there are four optical axes 32 and linear bearings 33, the four optical axes 32 are evenly distributed on the left and right sides of the first lifting cylinder 5, and the distances of the four optical axes 32 to the first lifting cylinder 5 are the same.

[0038] like Figure 1 , Figure 5 , Fig.10 and Fig.11 As shown: a connecting plate 34 is provided on the side of the double-rod cylinder 24, a clamping plate 25 is installed on the side of the connecting plate 34, a mounting groove 35 is opened on the top of the panel 1, a linear guide 36 is installed inside the mounting groove 35, a slider 37 is installed at the bottom of the clamping plate 25, the slider 37 interacts with the linear guide 36, and there are two sliders 37 and two linear guides 36 respectively.

[0039] When the present invention is in use: the rear brake hub cover 3 to be processed is placed at the corresponding position on the top of the panel 1, the outer edge of the rear brake hub cover 3 reaches the inner step of multiple positioning bosses 30, and multiple positioning bosses 30 further limit the rear brake hub cover 3. The positioning pin 14 at the bottom of the rear brake hub cover 3 passes through the second through hole 28, and the positioning pin 14 reaches between the two movable blocks 19. The camshaft hole 13 of the rear brake hub cover 3 and the floating pin 23 are plugged into each other. After the positioning and placement of the brake hub cover 3 are completed, the operator operates the hand-pull valve 9, the air flow passes through multiple pipelines and multiple throttle valves, the first lifting cylinder 5 extends and runs, the piston rod of the first lifting cylinder 5 abuts the positioning plate 15, the positioning plate 15 and the positioning block 16 move upward, and at the same time, the four optical axes 32 and the four linear bearings 33 interact with each other, the positioning plate 15 is further limited during the movement, the stability is improved, and the movement trajectory of the positioning plate 15 and the positioning block 16 is prevented from deviating. A V-shaped groove surface is arranged on the inner side of the positioning block 16, and a V-shaped inclined surface is formed on the outer side of the two movable blocks 19. The positioning block 16 abuts against the two movable blocks 19, and the two movable blocks 19 move closer to each other. The two clamping grooves 22 reach the side surface of the positioning pin 14, and the positioning pin 14 is clamped. The three clamping cylinders 4 operate at the same time, and the three clamping blocks 8 clamp the top surface of the rear brake hub cover 3 at the same time. The double-rod cylinder 24 contracts and operates, and the clamping plate 25 moves toward the rear brake hub cover 3. The two sliders 37 interact with the two linear guides 36, and the clamping plate 25 is further limited during the movement, so as to avoid the movement trajectory of the clamping plate 25. The deviation is further improved, the arc groove 26 of the clamping plate 25 abuts against the side surface of the convex column 12 to realize the overall clamping and fixing of the rear brake hub cover 3, the second lifting cylinder 6 retracts and runs, and the piston rod of the second lifting cylinder 6 drives the floating pin 23 to move downward, and the floating pin 23 is away from the rear brake hub cover 3, and the machine tool equipment is started to run. The rear brake hub cover 3 is automatically processed in sequence on the same equipment and the same pair of tooling. After the rear brake hub cover 3 is processed, the relevant tools return to their positions, the machine tool equipment is paused, and the operator operates the hand-pull valve 9. The second lifting cylinder 6 extends and runs, driving the floating pin 23 to rise, and the double-rod cylinder 24 extends and runs, driving the clamping plate 25 away from the rear brake hub cover 3, and the first lifting cylinder 5 The contraction operation drives the positioning plate 15 and the positioning block 16 to move downward, and the two movable blocks 19 are released. The elastic force of the two compression springs 21 makes the two movable blocks 19 move away from the positioning pin 14, and the positioning pin 14 is loosened. The three clamping cylinders 4 operate at the same time, and the three clamping blocks 8 open and move away from the top surface of the rear brake hub cover 3. The operator can easily take out the rear brake hub cover 3 product. The whole process provides a new clamping device to clamp and fix the rear brake hub cover workpiece at one time, and multiple processes are combined for processing, which reduces repeated clamping operations, saves time and manpower, and improves the processing accuracy of the workpiece to meet customer requirements. The processing efficiency and product quality are further improved. At the same time, the device has high versatility and is easy to promote and use within the company and the industry.

[0040] Although the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A clamping device for machining a rear brake hub cover, comprising a panel (1), a base plate (2), a rear brake hub cover (3), a clamping cylinder (4), a first lifting cylinder (5) and a second lifting cylinder (6), wherein: The bottom of the panel (1) is fixedly connected with a column (7), there are a plurality of columns (7), and the plurality of columns (7) are connected to a base plate (2), the base plate (2) is mounted on a movable platform in a machine tool, a clamping cylinder (4) is mounted at the bottom of the panel (1), a clamping block (8) is arranged at the top of the clamping cylinder (4), there are three clamping cylinders (4) and three clamping blocks (8), the rear brake hub cover (3) is placed on the top of the panel (1), and the three clamping blocks (8) clamp the top surface of the rear brake hub cover (3) at the same time, a hand-pull valve (9) is installed at the front side of the panel (1), and the hand-pull valve (9) simultaneously controls the clamping cylinder (4), the first lifting cylinder (5) and the second lifting cylinder (6) through a pipeline and a throttle valve; The surface of the rear brake hub cover (3) is provided with a central axis hole (10), and a countersunk end surface (11) is provided on the side of the central axis hole (10). A convex column (12) is fixedly connected to the surface of the rear brake hub cover (3). A camshaft hole (13) is provided on the surface of the rear brake hub cover (3), and the camshaft hole (13) is inside the convex column (12). The bottom of the rear brake hub cover (3) is also provided with a countersunk end surface (11), and the countersunk end surface (11) is outside the camshaft hole (13). A positioning pin (14) is provided at the bottom of the rear brake hub cover (3). The first lifting cylinder (5) and the second lifting cylinder (6) are installed on the top of the base plate (2), and a positioning clamping component is provided on the top of the base plate (2). A positioning plate (15) is installed on the top of the first lifting cylinder (5), and a positioning block (16) is provided on the top of the positioning plate (15). A fixing block (17) is installed on the side of the panel (1). A movable bolt (18) is inserted into the panel (1), a movable block (19) is arranged at the end of the movable bolt (18), a slide groove (20) is provided at the bottom of the panel (1), the movable block (19) is inside the slide groove (20), a compression spring (21) is sleeved on the side surface of the movable bolt (18), the compression spring (21) is outside the fixed block (17), there are two movable blocks (19), the positioning block (16) abuts against the bottom of the two movable blocks (19), a clamping groove (22) is provided inside the movable block (19), the two movable blocks (19) clamp the positioning pin (14) through the clamping groove (22), and the first lifting cylinder (5), the positioning plate (15), the positioning block (16), the fixed block (17), the movable bolt (18), the movable block (19), the compression spring (21) and the clamping groove (22) constitute a positioning clamping assembly; A floating pin (23) is arranged on the top of the second lifting cylinder (6), and the floating pin (23) reaches the inside of the camshaft hole (13). A double-rod cylinder (24) is installed at the bottom of the panel (1), and a clamping plate (25) is installed on the top of the double-rod cylinder (24). An arc groove (26) is opened on the side of the clamping plate (25), and the arc groove (26) abuts against the side surface of the convex column (12).

2. A clamping device for machining a rear brake hub cover according to claim 1, characterized in that: The surface of the panel (1) is provided with a first through hole (27), the surface of the panel (1) is provided with a second through hole (28), and the surface of the panel (1) is provided with a third through hole (29).

3. The clamping device for machining a rear brake hub cover according to claim 1, characterized in that: A V-shaped groove surface is arranged on the inner side of the positioning block (16), and V-shaped inclined surfaces are formed on the outer sides of the two movable blocks (19).

4. The clamping device for machining a rear brake hub cover according to claim 1, characterized in that: The top of the panel (1) is provided with a positioning boss (30), there are a plurality of positioning bosses (30), the rear brake hub cover (3) is placed on the top of the plurality of positioning bosses (30), the inner side of the positioning boss (30) is provided with a step, and the step abuts against the outer edge of the rear brake hub cover (3).

5. The clamping device for machining a rear brake hub cover according to claim 1, characterized in that: An inner groove (31) is provided on the side of the panel (1), and the fixing block (17) is installed inside the inner groove (31).

6. The clamping device for machining a rear brake hub cover according to claim 1, characterized in that: The top of the base plate (2) is fixedly connected with an optical axis (32), the top of the optical axis (32) is connected to the panel (1), a linear bearing (33) is installed inside the positioning plate (15), the optical axis (32) is inside the linear bearing (33), and there are four optical axes (32) and four linear bearings (33) respectively.

7. A clamping device for machining a rear brake hub cover according to claim 6, characterized in that: The four optical axes (32) are evenly distributed on the left and right sides of the first lifting cylinder (5), and the distances between the four optical axes (32) and the first lifting cylinder (5) are the same.

8. The clamping device for machining a rear brake hub cover according to claim 1, characterized in that: A connecting plate (34) is arranged on the side of the double-rod cylinder (24), and the clamping plate (25) is installed on the side of the connecting plate (34).

9. The clamping device for machining a rear brake hub cover according to claim 1, characterized in that: The top of the panel (1) is provided with a mounting groove (35), a linear guide rail (36) is installed inside the mounting groove (35), a slider (37) is installed at the bottom of the clamping plate (25), the slider (37) interacts with the linear guide rail (36), and there are two sliders (37) and two linear guide rails (36).

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