Clamping and fixing device and method for hub machining

Abstract

The invention discloses a clamping and fixing device and method for hub machining, and belongs to the technical field of hub machining. Comprising a synchronous sleeve, a fixing block, a center shaft, a clamping block, a main shifting rod, a main shifting block, a driving structure and a drawing structure, the center shaft and the fixing block are coaxially arranged, the fixing block is fixedly arranged at the end of the center shaft, the interior of the fixing block is of a hollow structure to form a drawing cavity, and the drawing cavity is provided with an opening facing the side away from the center shaft; and the edge of the opening of the drawing cavity is an inclined plane. In the using process, a user only needs to place the hub into the clamping block and enable the main shifting block to be connected with the hub in a clamped mode, position adjustment and clamping of the hub do not need to be intervened, and the operation difficulty of the device can be reduced easily.

Description

Technical Field

[0001] The present invention relates to a clamping and fixing device and method for hub machining, belonging to the technical field of hub machining. Background Art

[0002] With the continuous development of industrial automation technology, the automotive hub machining industry has an increasingly high requirement for the automation level of the flipping device. The automated machining device can reduce manual operation, lower labor intensity, and improve production efficiency.

[0003] When machining a hub, it is necessary to first clamp and fix the hub to ensure its stability during the machining process. However, conventional hub fixtures can only perform fixation. Since the angle of the hub needs to be corrected during hub machining, that is, the clamping position of the hub needs to be manually adjusted, there will be a certain clamping error when the hub is clamped by the conventional fixture, which affects the machining accuracy of the hub and reduces the machining quality of the hub. Summary of the Invention

[0004] The technical problem to be solved by the present invention is as follows: to provide a clamping and fixing device and method for hub machining, which solves the problem that in the prior art, conventional hub fixtures can only perform fixation and need to manually adjust the clamping position of the hub. Therefore, there will be a certain clamping error when the hub is clamped by the conventional fixture, which affects the machining accuracy of the hub and reduces the machining quality of the hub.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solution: A clamping and fixing device for hub machining includes a synchronous sleeve, a fixing block, a central shaft, a clamping block, a main dial rod, a main dialing block, a driving structure, and a pulling structure. The central shaft is coaxially arranged with the fixing block. The fixing block is fixedly arranged at the end of the central shaft. The inside of the fixing block is a hollow structure forming a pulling cavity. The pulling cavity is provided with an opening facing away from the central shaft. The edge of the opening of the pulling cavity is provided with an inclined surface. The clamping block is arranged in the pulling cavity. The outer side surface of the clamping block fits with the inclined surface at the opening of the pulling cavity. A hub is clamped inside the clamping block. The pulling structure is arranged inside the central shaft. The pulling structure is connected to the clamping block and enables the clamping block to reciprocate along the axial direction of the central shaft. The synchronous sleeve is sleeved outside the central shaft. One end of the main dial rod is fixedly arranged on the synchronous sleeve. The other end of the main dial rod extends to the opening of the pulling cavity. The main dialing block is fixed at the end of the main dial rod away from the synchronous sleeve. The main dialing block is clamped with the hub. The driving structure is arranged on the synchronous sleeve. The driving structure is used to drive the synchronous sleeve to rotate.

[0006] By adopting the above technical solution, when the wheel hub needs to be clamped, one end of the bearing installed in the middle of the wheel hub is inserted into the clamping block. At this time, the main shifting block is engaged with the wheel hub, and then the driving structure is started, so that the driving structure drives the synchronous sleeve to rotate, and the synchronous sleeve drives the main shifting rod to rotate, so that the wheel hub is rotated in the clamping block through the main shifting block, so as to adjust the clamping position of the wheel hub. When the clamping position of the wheel hub is adjusted, the drawing structure pulls the clamping block to move in the direction of the central axis, and the outer side surface of the clamping block abuts against the inclined surface of the drawing cavity. When the wheel hub is clamped, one end of the clamping block that clamps the wheel hub produces an inward deformation, so that the clamping block clamps and locks the wheel hub, completing the clamping and fixing of the wheel hub. During the whole process, the user only needs to put the wheel hub into the clamping block, and make the main toggle block engage with the wheel hub. There is no need to intervene in the position adjustment and clamping of the wheel hub, which is beneficial to reducing the operation difficulty of the device. At the same time, through the automated adjustment method, the clamping position of the wheel hub can be made more accurate, which is beneficial to reducing the clamping error of the wheel hub, improving the accuracy of subsequent processing of the wheel hub, and thus improving the processing quality of the wheel hub.

[0007] The present invention is further configured as follows: the driving structure includes a driving motor, a transmission pulley and a transmission belt, the transmission pulley is sleeved on the outside of the synchronous sleeve and fixedly connected to the synchronous sleeve, one end of the transmission belt is sleeved on the transmission pulley, and the other end of the transmission belt is connected to the driving power of the driving motor, and the driving motor forms a pulley group through the transmission belt and the transmission pulley to drive the transmission pulley to rotate.

[0008] The present invention is further configured as follows: the pulling structure includes a pulling rod, a mounting plate and a driving rod, one end of the pulling rod passes through the fixed block, extends into the clamping block and is fixedly connected to the clamping block, the other end of the pulling rod extends to a side of the central axis away from the fixed block, the mounting plate is fixed to a side of the pulling rod away from the fixed block, the driving rod is arranged at an end of the mounting plate away from the central axis, the driving rod is dynamically connected to the pulling rod and pulls the pulling rod to reciprocate axially along the central axis.

[0009] The present invention is further configured as follows: an auxiliary lever arranged opposite to the main lever is fixedly arranged on the synchronous sleeve, an intermediate block is fixedly arranged on one end of the auxiliary lever away from the synchronous sleeve, a rotating block is rotatably arranged on the side of the intermediate block away from the auxiliary lever, a sliding groove is provided in the rotating block, an auxiliary shifting block is slidably arranged in the sliding groove, one end of the auxiliary shifting block extends to the outside of the rotating block, a bolt member is arranged on the rotating block, the bolt member is located at the rotating shaft of the rotating block and is coaxially arranged with the rotating shaft, the bolt member axially penetrates the intermediate block and the rotating block and is threadedly connected to the auxiliary lever.

[0010] By adopting the above technical scheme, when the bolt member is not locked, the rotating block can rotate relative to the middle block, and the direction of the auxiliary toggle block can be adjusted at this time. When the direction of the auxiliary toggle block is adjusted, the auxiliary toggle block is pulled out of the sliding groove, so that the auxiliary toggle block contacts and engages with the wheel hub, and then the bolt member is locked. Under the action of the threaded structure, the pressure between the rotating block and the middle block is increased, thereby increasing the friction force. When the friction force makes it impossible for the rotating block to continue to rotate, the rotating block is locked. At this time, the synchronous sleeve can simultaneously drive the main toggle lever and the auxiliary toggle lever to move, and the auxiliary toggle block and the main toggle block can simultaneously toggle the wheel hub, so that the force difference received on both sides of the wheel hub when it is toggling and rotating is reduced, which is beneficial to improving the stability of the wheel hub during rotation and further improving the rotation adjustment accuracy of the wheel hub.

[0011] The present invention is further configured as follows: an inflation cavity is connected to the side of the inner wall of the drawing cavity away from the opening, a flexible expansion membrane is sealed and fixedly provided at the connection between the inflation cavity and the drawing cavity, a limiting groove aligned with the inflation cavity is provided on the outer side of the clamping block located on one side of the drawing cavity, the inflation cavity is filled with compressed gas, and the flexible expansion membrane expands and extends into the limiting groove.

[0012] By adopting the above technical solution, when the drawing structure suddenly fails, since the flexible expansion membrane is located in the limiting groove and the inflation cavity is filled with gas, the flexible expansion membrane and the limiting groove form a limiting structure, and the clamping block moves in the direction away from the central axis when the side of the wheel hub installed by the clamping block is reset due to elastic action. However, the gas tension in the inflation cavity provides a reaction force toward the central axis for the clamping block, reducing the movement distance of the clamping block when resetting, so that after the drawing structure suddenly fails, the clamping block can still retain part of the clamping force to clamp the wheel hub, thereby avoiding the situation that the wheel hub suddenly escapes from the clamping block after the pulling structure suddenly fails, thereby improving the stability of the wheel hub during processing.

[0013] The present invention is further configured as follows: an air pressure chamber is opened in the fixed block, a sliding plate is arranged in the air pressure chamber to slide axially along the central axis, a connecting rod is fixed to the side of the sliding plate away from the central axis, an end of the connecting rod away from the sliding plate extends to the outside of the fixed block and is fixed with a pressing plate, a return spring is fixed between the side of the sliding plate away from the connecting rod and the inner wall of the air pressure chamber, and an intermediate channel is arranged to connect the air pressure chamber and the inflation chamber.

[0014] The present invention is further configured as follows: a movable cavity is provided in the fixed block, a movable plate is slidably provided in the movable cavity, a synchronization rod is fixed on the movable plate, one end of the synchronization rod extends to the inner wall of the drawing cavity and a synchronization plate is fixedly provided thereon, a sealing cavity respectively connected with the middle channel and the movable cavity is provided in the fixed block, a sealing plate is slidably provided in the sealing cavity, a through channel is provided on the sealing plate, the through channel can be connected with the middle channel, one end of the sealing plate extends into the movable cavity and is fixedly connected to the movable plate, the movable plate slides along the extension direction of the central axis, and a sealing spring fixed to the inner wall of the movable cavity is provided on the side of the movable plate facing the central axis.

[0015] By adopting the above technical solution, the pressing plate and the fixed block are separated through the connecting rod under the elastic action of the return spring, and the air pressure at the connection point between the air pressure chamber and the middle channel is less than the atmospheric pressure. The flexible expansion membrane retracts into the inflation chamber under the pressure of the external air pressure, and the sealing plate closes the middle channel. When the wheel hub is installed, the wheel hub squeezes the pressing plate and moves the sliding plate toward the direction of the central axis through the connecting rod, thereby increasing the air pressure at the connection point between the air pressure chamber and the middle channel and forming compressed gas. At this time, since the sealing plate closes the middle channel, the gas in the middle channel cannot enter the inflation chamber. At this time, the flexible expansion membrane still retracts into the inflation chamber. Then, after the clamping position of the wheel hub is adjusted, the pulling structure pulls the clamping block toward the direction of the central axis. During the movement of the clamping block, since the flexible expansion membrane retracts in the inflation chamber, the flexible expansion membrane will not be clamped between the clamping block and the inner wall of the drawing chamber to affect the subsequent expansion limit, thereby improving the reliability of the expansion limit using the flexible expansion membrane. When the clamping block abuts against the synchronization plate and presses the synchronization plate toward the center axis, the synchronization plate drives the movable plate to move through the synchronization rod, and the sealing spring is compressed. When the through channel is connected with the middle channel, the middle channel is connected with the inflation chamber through the through channel. At this time, the compressed gas in the middle channel enters the inflation chamber. At this time, the flexible expansion membrane expands into the drawing chamber. As the clamping block continues to move, when the limit groove is aligned with the inflation chamber, the flexible expansion membrane expands into the limit groove for limiting, thereby achieving the limiting effect on the clamping block.

[0016] A clamping and fixing method for a clamping and fixing device for wheel hub processing, the method comprising: S1: insert the wheel hub into the clamping block for clamping, and the main shifting block is clamped with the wheel hub; S2: Start the driving structure, the driving structure makes the synchronous sleeve rotate, the synchronous sleeve drives the main shifting block to move through the main shifting rod, so that the main shifting block shifts the wheel hub to rotate, and the clamping angle position of the wheel hub is adjusted; S3: The drawing structure is driven to move the clamping block toward the center axis. Under the action of the inclined surface of the drawing cavity, the part of the clamping block clamping the wheel hub is retracted inward, thereby completing the clamping and fixing of the wheel hub by the clamping block.

[0017] The beneficial effect of the present invention is that during the use of the device, the user only needs to put the wheel hub into the clamping block and make the main shift block engage with the wheel hub. There is no need to intervene in the position adjustment and clamping of the wheel hub, which is beneficial to reducing the operating difficulty of the device. At the same time, through the automated adjustment method, the clamping position of the wheel hub can be made more accurate, which is beneficial to reducing the clamping error of the wheel hub, improving the accuracy of subsequent processing of the wheel hub, and thus improving the processing quality of the wheel hub. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention when clamping a wheel hub; Figure 2 It is a structural cross-sectional view of the present invention; Figure 3 for Figure 2 A magnified view of the structure at center A; Figure 4 for Figure 2 Schematic diagram of the structure when the middle clamping block does not abut against the inclined surface of the drawing cavity; Figure 5 for Figure 4 A magnified view of the structure at point B.

[0019] In the figure: 10, drive pulley; 11, drive belt; 12, synchronous sleeve; 13, fixed block; 14, central shaft; 15, bearing; 16, clamping block; 17, pulling rod; 18, mounting plate; 19, main lever; 20, main toggle block; 21, auxiliary lever; 22, intermediate block; 23, rotating block; 24, sliding groove; 25, auxiliary toggle block; 30, air pressure chamber; 31, sliding plate; 32, connecting rod; 33, pressing plate; 34, reset spring; 35, intermediate channel; 36, inflation chamber; 37, flexible expansion membrane; 38, limiting groove; 39, sealing chamber; 40, sealing plate; 41, movable plate; 42, movable chamber; 43, sealing spring; 44, synchronous rod; 45, synchronous plate; 46, pulling chamber; 50, wheel hub. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0021] like Figure 1As shown in the figure, a clamping and fixing device for hub machining includes a synchronous sleeve 12, a fixing block 13, a central shaft 14, a clamping block 16, a main shifting lever 19, a main shifting block 20, a driving structure and a drawing structure. The central shaft 14 is fixedly arranged on a fixed surface that cannot move externally. The central shaft 14 and the fixing block 13 are coaxially arranged. The fixing block 13 is fixedly arranged at the end of the central shaft 14. The inside of the fixing block 13 is a hollow structure to form a drawing cavity 46. The drawing cavity 46 is provided with an opening facing away from the central shaft 14. The edge of the opening of the drawing cavity 46 is provided with an inclined surface. The clamping block 16 is arranged in the drawing cavity 46. The outer side surface of the clamping block 16 fits with the inclined surface at the opening of the drawing cavity 46. The hub 50 is clamped inside the clamping block 16. The hub 50 includes a connecting flange fixed to the wheel spoke and a fixing flange connected to the vehicle frame. A bolt fastener is installed on the connecting flange. One end of the hub 50 provided with the fixing flange is inserted into the clamping block 16 and clamped by the clamping block 16. The drawing structure is arranged inside the central shaft 14. The drawing structure is connected to the clamping block 16 and enables the clamping block 16 to reciprocate axially along the central shaft 14. The synchronous sleeve 12 is sleeved outside the central shaft 14. A bearing 15 is arranged between the synchronous sleeve 12 and the central shaft 14. One end of the main shifting lever 19 is fixedly arranged on the synchronous sleeve 12. The other end of the main shifting lever 19 extends to the opening of the drawing cavity 46. The main shifting block 20 is fixed to the end of the main shifting lever 19 away from the synchronous sleeve 12. The main shifting block 20 is clamped to the end of the bolt fastener located on the connecting flange to form a clamping structure with the hub 50. The driving structure is arranged on the synchronous sleeve 12. The driving structure is used to drive the synchronous sleeve 12 to rotate.

[0022] As Figures 1 to 2As shown in the figure, the driving structure includes a driving motor, a transmission pulley 10, and a transmission belt 11. The transmission pulley 10 is sleeved outside the synchronous sleeve 12 and fixedly connected to the synchronous sleeve 12. A driving pulley matching the transmission pulley 10 is fixed to the power output end of the driving motor. One end of the transmission belt 11 is sleeved on the transmission pulley 10, and the other end of the transmission belt 11 is sleeved on the driving pulley. The driving motor forms a pulley set with the transmission pulley 10 through the transmission belt 11 to drive the transmission pulley 10 to rotate. The driving structure also includes a direct drive form, where the output end of the driving motor is directly fixed to the synchronous sleeve 12 through a connecting flange to drive the synchronous sleeve 12 to move. The pulling structure includes a pulling rod 17, a mounting plate 18, and a driving rod. One end of the pulling rod 17 penetrates through the fixed block 13 and extends into the clamping block 16 and is fixedly connected to the clamping block 16. The other end of the pulling rod 17 extends to the side of the central shaft 14 away from the fixed block 13. The mounting plate 18 is fixed to the side of the pulling rod 17 away from the fixed block 13. The driving rod is arranged at one end of the mounting plate 18 away from the central shaft 14. The driving rod is power-connected to the pulling rod 17 and pulls the pulling rod 17 to reciprocate axially along the central shaft 14. The driving rod is fixedly arranged on an external fixed structure, so that the driving rod remains stationary relative to the central shaft 14 during the movement process. The driving rod includes, but is not limited to, linear driving elements such as electric push rods and cylinders. The pulling rod 17 is driven by linear driving elements such as electric push rods and cylinders to move axially to form a pulling action.

[0023] As Figure 2 shown in the figure, an auxiliary toggle lever 21 is fixedly arranged on the synchronous sleeve 12 opposite to the main toggle lever 19. An intermediate block 22 is fixedly arranged at one end of the auxiliary toggle lever 21 away from the synchronous sleeve 12. A rotating block 23 is rotatably arranged on one side of the intermediate block 22 away from the auxiliary toggle lever 21. A sliding groove 24 is formed in the rotating block 23. An auxiliary toggle block 25 is slidably arranged in the sliding groove 24. One end of the auxiliary toggle block 25 extends outside the rotating block 23. The auxiliary toggle block 25 slides radially along the central shaft 14. A friction layer for increasing the sliding friction of the auxiliary toggle block 25 is arranged between one end of the auxiliary toggle block 25 located in the sliding groove 24 and the inner wall of the sliding groove 24. A bolt member is arranged on the rotating block 23. The bolt member is located at the rotating shaft of the rotating block 23 and is coaxially arranged with the rotating shaft. The bolt member axially penetrates through the intermediate block 22 and the rotating block 23 and is threadedly connected to the auxiliary toggle lever 21. A locking bolt can also be arranged on the rotating block 23. One end of the locking bolt is inserted into the sliding groove 24 and abuts against the auxiliary toggle block 25. The locking bolt is threadedly connected to the rotating block 23. The axial movement of the locking bolt is achieved through a threaded structure, so as to change the abutting pressure between the locking bolt and the auxiliary toggle block 25, and achieve the purpose of stopping and limiting the auxiliary toggle block 25 by using friction.

[0024] As Figures 2 to 5As shown, on the side of the inner wall of the drawing cavity 46 far from the opening, an inflation cavity 36 is connected. At the connection between the inflation cavity 36 and the drawing cavity 46, a flexible expansion film 37 is fixedly arranged in a sealed manner. On the outer side of the clamping block 16 and on the side located in the drawing cavity 46, a limiting groove 38 aligned with the inflation cavity 36 is provided. Compressed gas is filled in the inflation cavity 36, and the flexible expansion film 37 expands and extends into the limiting groove 38. A pressure chamber 30 is provided in the fixed block 13. A sliding plate 31 is axially slidably arranged in the pressure chamber 30 along the central axis 14. A connecting rod 32 is fixed on the side of the sliding plate 31 away from the central axis 14. One end of the connecting rod 32 away from the sliding plate 31 extends outside the fixed block 13 and is fixed with a pressing plate 33. A return spring 34 is fixedly arranged between the side of the sliding plate 31 away from the connecting rod 32 and the inner wall of the pressure chamber 30. An intermediate channel 35 is provided for connection between the pressure chamber 30 and the inflation cavity 36. An activity cavity 42 is provided in the fixed block 13. An activity plate 41 is slidably arranged in the activity cavity 42. A damping layer is fixed between the sliding surface of the activity plate 41 and the activity cavity 42, and the damping layer is used to limit the sliding speed of the activity plate 41. A synchronous rod 44 is fixed on the activity plate 41. One end of the synchronous rod 44 extends to the inner wall of the drawing cavity 46 and is fixedly provided with a synchronous plate 45. A sealing cavity 39 is provided in the fixed block 13 and is respectively connected to the intermediate channel 35 and the activity cavity 42. A sealing plate 40 is slidably arranged in the sealing cavity 39. A through channel is provided on the sealing plate 40, and the through channel can be connected to the intermediate channel 35. One end of the sealing plate 40 extends into the activity cavity 42 and is fixedly connected to the activity plate 41. The activity plate 41 slides along the extending direction of the central axis 14. On the side of the activity plate 41 facing the central axis 14, a sealing spring 43 fixed to the inner wall of the activity cavity 42 is provided.

[0025] When the wheel hub 50 needs to be clamped, one end of the bearing installed in the middle of the wheel hub 50 is inserted into the clamping block 16. At this time, the main shifting block 20 is engaged with the wheel hub 50, and then the driving structure is started, so that the driving structure drives the synchronous sleeve 12 to rotate, so that the synchronous sleeve 12 drives the main shifting rod 19 to rotate, so that the wheel hub 50 is rotated in the clamping block 16 through the main shifting block 20, so as to adjust the clamping position of the wheel hub 50. When the clamping position of the wheel hub 50 is adjusted, the drawing structure pulls the clamping block 16 to move in the direction of the central axis 14. Under the action of the outer side surface of the clamping block 16 abutting against the inclined surface of the drawing cavity 46, The clamping block 16 clamps one end of the wheel hub 50 and produces an inward deformation, so that the clamping block 16 clamps and locks the wheel hub 50, completing the clamping and fixation of the wheel hub 50. During the whole process, the user only needs to put the wheel hub 50 into the clamping block 16 and make the main shift block 20 engage with the wheel hub 50. There is no need to intervene in the position adjustment and clamping of the wheel hub 50, which is beneficial to reducing the difficulty of operating the device. At the same time, through the automated adjustment method, the clamping position of the wheel hub 50 can be made more accurate, which is beneficial to reducing the clamping error of the wheel hub 50, improving the accuracy of subsequent processing of the wheel hub 50, and thereby improving the processing quality of the wheel hub 50.

[0026] When the bolt is not locked, the rotating block 23 can rotate relative to the middle block 22. At this time, the direction of the auxiliary toggle block 25 can be adjusted. When the direction of the auxiliary toggle block 25 is adjusted, the auxiliary toggle block 25 is pulled out of the sliding groove 24 so that the auxiliary toggle block 25 contacts and engages with the wheel hub 50, and then the bolt is locked. Under the action of the threaded structure, the pressure between the rotating block 23 and the middle block 22 increases, thereby increasing the friction force. When the friction force makes it impossible for the rotating block 23 to continue to rotate, the rotating block 23 is locked. At this time, the synchronous sleeve 12 can simultaneously drive the main toggle rod 19 and the auxiliary toggle rod 21 to move, and the auxiliary toggle block 25 and the main toggle block 20 can simultaneously toggle the wheel hub 50, so that the force difference received on both sides of the wheel hub 50 when it is toggling and rotating is reduced, which is beneficial to improving the stability of the wheel hub 50 during rotation and further improving the rotation adjustment accuracy of the wheel hub 50.

[0027] When the drawing structure fails suddenly, since the flexible expansion membrane 37 is located in the limiting groove 38 and the inflation chamber 36 is filled with gas, the flexible expansion membrane 37 and the limiting groove 38 form a limiting structure. When the clamping block 16 is installed on one side of the wheel hub 50 and resets due to elastic action, the clamping block 16 moves in the direction away from the central axis 14. However, at this time, the gas tension in the inflation chamber 36 provides a reaction force toward the central axis 14 for the clamping block 16, reducing the movement distance of the clamping block 16 when resetting, so that after the drawing structure fails suddenly, the clamping block 16 can still retain part of the clamping force to clamp the wheel hub 50, thereby avoiding the situation where the wheel hub 50 suddenly escapes from the clamping block 16 after the pulling structure fails suddenly, thereby improving the stability of the wheel hub 50 during processing.

[0028] Under the elastic action of the return spring 34, the pressing plate 33 is separated from the fixed block 13 through the connecting rod 32, and the air pressure at the connection between the air pressure chamber 30 and the intermediate channel 35 is less than the atmospheric pressure. The flexible expansion film 37 retracts into the inflation chamber 36 under the pressure of the external air pressure, and the sealing plate 40 closes the intermediate channel 35. When installing the hub 50, the hub 50 exerts extrusion on the pressing plate 33, and drives the sliding plate 31 to move towards the central axis 14 through the connecting rod 32, so that the air pressure at the connection between the air pressure chamber 30 and the intermediate channel 35 increases and compressed gas is formed. At this time, since the sealing plate 40 closes the intermediate channel 35, the gas in the intermediate channel 35 cannot enter the inflation chamber 36. At this time, the flexible expansion film 37 still retracts into the inflation chamber 36. Then, after the clamping position of the hub 50 is adjusted, the pulling structure pulls the clamping block 16 to move towards the central axis 14. During the movement of the clamping block 16, since the flexible expansion film 37 retracts in the inflation chamber 36, the flexible expansion film 37 will not be clamped between the clamping block 16 and the inner wall of the pulling chamber 46 to affect subsequent expansion and limiting, improving the reliability of using the flexible expansion film 37 for expansion and limiting. When the clamping block 16 abuts against the synchronous plate 45 and presses the synchronous plate 45 towards the central axis 14, the synchronous plate 45 drives the movable plate 41 to move through the synchronous rod 44, and the sealing spring 43 is compressed. When the through channel communicates with the intermediate channel 35, the intermediate channel 35 communicates with the inflation chamber 36 through the through channel. At this time, the compressed gas in the intermediate channel 35 enters the inflation chamber 36. At this time, the flexible expansion film 37 expands into the pulling chamber 46. As the clamping block 16 continues to move, when the limiting groove 38 aligns with the inflation chamber 36, the flexible expansion film 37 expands into the limiting groove 38 for limiting, achieving the limiting effect on the clamping block 16.

[0029] When the wheel hub 50 is processed, the drawing structure drives the clamping block 16 to move in a direction away from the central axis 14 by driving the drawing rod 17, thereby releasing the pressure of the clamping block 16 on the synchronization plate 45. Since the force applied by the drawing structure to the clamping block 16 is greater than the expansion tension provided by the air pressure difference in the inflation chamber 36 for the flexible expansion membrane 37, the clamping block 16 continues to move at this time, and the flexible expansion membrane 37 is pressed into the inflation chamber 36. As the clamping block 16 continues to move, the wheel hub 50 releases the pressure on the pressing plate 33, and the sliding plate 31 is pushed to reset and slide under the elastic action of the reset spring 34, so that the pressing plate 33 is disengaged from the fixed block 13 through the connecting rod 32, and the air pressure between the air pressure chamber 30 and the middle channel 35 is reduced and is less than the atmospheric pressure. During the movement of the clamping block 16, due to the effect of the damping layer, the sliding speed of the movable plate 41 is slow, and the through channel is not quickly disconnected from the middle channel 35. Therefore, the air pressure in the inflation chamber 36 is the same as the air pressure in the air pressure chamber 30, both of which are less than the atmospheric pressure. Therefore, the flexible expansion membrane 37 retracts into the inflation chamber 36 under the action of the pressure difference until the sealing plate 40 closes the middle channel 35. When the clamping block 16 is disengaged from the inclined surface of the drawing chamber 46, the clamping block 16 releases the clamping of the wheel hub 50. At this time, the wheel hub 50 can be disassembled, thereby completing the processing of the wheel hub 50.

[0030] A clamping and fixing method for a clamping and fixing device for wheel hub processing, the method comprising: S1: insert the wheel hub 50 into the clamping block 16 for clamping, and the main shifting block 20 is clamped with the wheel hub 50; S2: Start the driving structure, which causes the synchronous sleeve 12 to rotate. The synchronous sleeve 12 drives the main shifting block 20 to move through the main shifting rod 19, so that the main shifting block 20 shifts the wheel hub 50 to rotate, thereby completing the adjustment of the clamping angle position of the wheel hub 50; S3: The drawing structure is driven to move the clamping block 16 toward the central axis 14. Under the action of the inclined surface of the drawing cavity 46, the part of the clamping block 16 clamping the wheel hub 50 is retracted toward the inside, thereby completing the clamping and fixing of the wheel hub 50 by the clamping block 16; S4: The external cutting equipment processes the wheel hub 50; S5: After the wheel hub 50 is processed, the drawing structure pushes the clamping block 16 to move away from the central axis 14 through the drawing rod 17. When the clamping block 16 is out of contact with the inclined surface of the drawing cavity 46, the clamping of the wheel hub 50 is released.

[0031] S6: Repeat steps S1 to S5.

[0032] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A clamping and fixing device for hub processing, characterized in that: It includes a synchronous sleeve (12), a fixed block (13), a central shaft (14), a clamping block (16), a main dial rod (19), a main dialing block (20), a driving structure and a drawing structure. The central shaft (14) is coaxially arranged with the fixed block (13). The fixed block (13) is fixedly arranged at the end of the central shaft (14). The inside of the fixed block (13) is a hollow structure to form a drawing cavity (46). The drawing cavity (46) is provided with an opening facing away from the central shaft (14). The edge of the opening of the drawing cavity (46) is provided with an inclined surface. The clamping block (16) is arranged in the drawing cavity (46). The outer side surface of the clamping block (16) fits with the inclined surface at the opening of the drawing cavity (46). A hub (50) is clamped in the clamping block (16). The drawing structure is arranged in the central shaft (14). The drawing structure is connected to the clamping block (16) and makes the clamping block (16) reciprocate axially along the central shaft (14). The synchronous sleeve (12) is sleeved outside the central shaft (14). One end of the main dial rod (19) is fixedly arranged on the synchronous sleeve (12). The other end of the main dial rod (19) extends to the opening of the drawing cavity (46). The main dialing block (20) is fixed at the end of the main dial rod (19) away from the synchronous sleeve (12). The main dialing block (20) is clamped with the hub (50). The driving structure is arranged on the synchronous sleeve (12). The driving structure is used to drive the synchronous sleeve (12) to rotate.

2. A clamping and fixing device for hub machining according to claim 1, characterized in that: The driving structure includes a driving motor, a transmission belt pulley (10) and a transmission belt (11). The transmission belt pulley (10) is sleeved outside the synchronous sleeve (12) and fixedly connected to the synchronous sleeve (12). One end of the transmission belt (11) is sleeved on the transmission belt pulley (10). The other end of the transmission belt (11) is power-connected to the driving motor. The driving motor and the transmission belt pulley (10) form a pulley set through the transmission belt (11) to drive the transmission belt pulley (10) to rotate.

3. A clamping and fixing device for hub machining according to claim 1, characterized in that: The drawing structure includes a drawing rod (17), a mounting plate (18) and a driving rod. One end of the drawing rod (17) penetrates through the fixed block (13) and extends into the clamping block (16) and is fixedly connected to the clamping block (16). The other end of the drawing rod (17) extends to the side of the central shaft (14) away from the fixed block (13). The mounting plate (18) is fixed on the side of the drawing rod (17) away from the fixed block (13). The driving rod is arranged at the end of the mounting plate (18) away from the central shaft (14). The driving rod is power-connected to the drawing rod (17) and pulls the drawing rod (17) to reciprocate axially along the central shaft (14).

4. A clamping and fixing device for hub processing according to claim 1, wherein: An auxiliary lever (21) is fixedly arranged on the synchronous sleeve (12) and is arranged opposite to the main lever (19). An intermediate block (22) is fixedly arranged on one end of the auxiliary lever (21) away from the synchronous sleeve (12). A rotating block (23) is rotatably arranged on the side of the intermediate block (22) away from the auxiliary lever (21). A sliding groove (24) is provided in the rotating block (23). An auxiliary shifting block (25) is slidably arranged in the sliding groove (24). One end of the auxiliary shifting block (25) extends to the outside of the rotating block (23). A bolt member is arranged on the rotating block (23). The bolt member is located at the rotating axis of the rotating block (23) and is arranged coaxially with the rotating axis. The bolt member axially penetrates the intermediate block (22) and the rotating block (23) and is threadedly connected to the auxiliary lever (21).

5. A clamping and fixing device for hub processing according to claim 1, characterized in that: An inflation chamber (36) is provided in communication with the inner wall of the drawing chamber (46) at a side away from the opening, a flexible expansion membrane (37) is fixedly provided at the connection between the inflation chamber (36) and the drawing chamber (46) to seal the connection, and a limiting groove (38) aligned with the inflation chamber (36) is provided on the outer side surface of the clamping block (16) at one side of the drawing chamber (46), the inflation chamber (36) is filled with compressed gas, and the flexible expansion membrane (37) expands and extends into the limiting groove (38).

6. The clamping and fixing device for hub machining according to claim 5, wherein: A pneumatic chamber (30) is provided in the fixed block (13), a sliding plate (31) is provided in the pneumatic chamber (30) to slide axially along the central axis (14), a connecting rod (32) is fixed to the side of the sliding plate (31) away from the central axis (14), an end of the connecting rod (32) away from the sliding plate (31) extends to the outside of the fixed block (13) and is fixed to a pressing plate (33), a return spring (34) is fixedly provided between the side of the sliding plate (31) away from the connecting rod (32) and the inner wall of the pneumatic chamber (30), and an intermediate channel (35) is provided to communicate with the pneumatic chamber (30) and the inflation chamber (36).

7. The clamping and fixing device for hub machining according to claim 6, wherein: A movable cavity (42) is provided in the fixed block (13), a movable plate (41) is slidably provided in the movable cavity (42), a synchronization rod (44) is fixed on the movable plate (41), one end of the synchronization rod (44) extends to the inner wall of the drawing cavity (46) and a synchronization plate (45) is fixedly provided thereon, a sealing cavity (39) is provided in the fixed block (13) and is respectively connected to the middle channel (35) and the movable cavity (42), a sealing plate (40) is slidably provided in the sealing cavity (39), a through channel is provided on the sealing plate (40), the through channel can be connected to the middle channel (35), one end of the sealing plate (40) extends into the movable cavity (42) and is fixedly connected to the movable plate (41), the movable plate (41) slides along the extension direction of the central axis (14), and a sealing spring (43) fixed to the inner wall of the movable cavity (42) is provided on the side of the movable plate (41) facing the central axis (14).

8. A clamping and fixing method for the clamping and fixing device for hub processing according to any one of claims 1-7, characterized in that: The method comprises: S1: inserting the wheel hub (50) into the clamping block (16) for clamping, and the main shifting block (20) is clamped with the wheel hub (50); S2: Activate the driving structure. The driving structure rotates the synchronizing sleeve (12), and the synchronizing sleeve (12) drives the main shifting block (20) to move through the main shifting lever (19), so that the main shifting block (20) shifts the hub (50) to rotate, completing the adjustment of the clamping angle position of the hub (50); S3: The driving and pulling structure moves the clamping block (16) towards the direction of the central axis (14). Under the action of the inclined surface of the pulling cavity (46), the part of the clamping block (16) that clamps the hub (50) converges towards the inside, thereby completing the clamping and fixing of the hub (50) by the clamping block (16).

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