Quick-change pitch circle jacket clamp

Abstract

The utility model relates to the technical field of machining, in particular to a quick-change pitch circle jacket clamp. After the inner side and the outer side of the gear are supported and positioned through the fixed jig and the movable jig, the core shaft drives the pitch circle clamping sleeve to move so as to clamp and position the outer ring of the gear on a clamping station, the gear is centered and clamped through end face positioning and the multi-point pitch circle clamping sleeve, clamping deformation is avoided, and compared with a traditional three-point clamping fixture, the machining efficiency is greatly improved. Compared with a thin film clamp imported from abroad, the thin film clamp has the advantages that the clamping deformation is smaller, the roundness and tooth jump precision after machining are higher, the production changing speed is higher, the tooth face and one end face of a gear are supported and positioned, it can be guaranteed that the machining allowance of the follow-up procedure is smaller and more uniform, the machining efficiency is higher, and compared with a thin film clamp imported from abroad, the thin film clamp is lower in price, higher in precision and high in whole cost performance; the cutting liquid sprayed by the nozzle can cool the tooth surface of the gear, the end face machining effect of the gear is guaranteed, and the machining efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, and relates to a quick-change pitch circle clamp. Background Art

[0002] With the development and progress of science and technology, automated production is increasingly used in the field of mechanical machining. Automated production has higher requirements on the reliability, service life and precision of equipment. Ordinary chucks and collets can no longer meet the current mechanical machining needs.

[0003] When traditional three-point clamping fixtures are used to clamp gears, they can only clamp a single gear or gears within a certain range of sizes. The contact surface of the workpiece is small, the clamping force on the workpiece is not strong enough, and the positioning accuracy is not high. After repeated use, the accuracy of the fixture will be affected to a certain extent, resulting in low accuracy in repeated clamping. At the same time, during the rotation process, it is easy to cause a large centrifugal force in the cutting, and the cutting is more likely to become unstable. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a quick-change pitch circle clamp which adopts end face positioning and multi-point pitch circle clamping to center and clamp the gear to avoid clamping deformation, has higher roundness and tooth jump accuracy after processing, and has faster production change speed.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model to solve its technical problems is:

[0006] A quick-change pitch sleeve fixture, comprising:

[0007] A body, on which a clamping space is provided, a clamping seat is provided in the clamping space, and the body is connected to the clamping seat;

[0008] A clamping assembly is arranged on the clamping space, the clamping assembly comprises a pitch circle sleeve, the pitch circle sleeve is sleeved on the clamping seat, and the pitch circle sleeve abuts against the inner side wall of the body, and the pitch circle sleeve is used to clamp and position the outer ring of the gear;

[0009] A positioning jig is arranged on the clamping seat, the positioning jig includes a fixed jig and a movable jig, the movable jig is connected to the pitch circle jacket, the movable jig is sleeved on the fixed jig, the fixed jig is arranged on the clamping seat, the movable jig and the fixed jig are both provided with positioning surfaces matching the end faces of the gears, the fixed jig and the movable jig are used to support and position the inner and outer sides of the gears, and the pitch circle jacket and the positioning jig form a clamping station for the gears;

[0010] A mandrel, disposed on the sliding hole of the body, the mandrel being drivingly connected to the pitch circle jacket, and the mandrel being used to drive the pitch circle jacket to move so as to clamp and position the gear on the clamping station;

[0011] A cleaning component is arranged on the movable fixture, and the cleaning component includes a cleaning block, and the cleaning block is arranged on the movable fixture. A plurality of nozzles for spraying cutting fluid are evenly arranged on the cleaning block, and the nozzles are arranged toward the clamping station.

[0012] In one embodiment of the utility model, a limiting hole is provided on the body, a limiting screw is provided on the limiting hole, a limiting groove is provided on the outer side wall of the pitch circle jacket, and the limiting screw is passed through the limiting groove.

[0013] In one embodiment of the utility model, the cleaning component also includes a first flow channel, the first flow channel is arranged on the clamping seat, the first flow channel is connected to the nozzle, a second flow channel connected to the first flow channel is arranged on the core shaft, and a one-way valve is arranged on the second flow channel.

[0014] In one embodiment of the present invention, the cleaning component further includes a third flow channel, the third flow channel is connected to the second flow channel, a small hole is provided on the positioning surface of the movable fixture, and the third flow channel is connected to the small hole.

[0015] In one embodiment of the utility model, a first sealing ring is provided between the fixed fixture and the movable fixture, a third sealing ring is provided between the core shaft and the body, and a fourth sealing ring is provided between the cleaning block and the fixed fixture.

[0016] In one embodiment of the utility model, a movable hole is provided on the main body, a piston rod is provided on the core shaft, the piston rod is slidably arranged on the movable hole, the thickness of the piston rod is smaller than the depth of the movable hole, so that a movable gap is formed between the piston rod and the movable hole, and the assembly gap between the pitch circle sleeve and the clamping seat is smaller than the movable gap.

[0017] In one embodiment of the utility model, a guide rod is provided on the movable jig, and the guide rod is passed through the guide hole of the fixed jig. A spring is provided on the guide rod, one end of the spring abuts against the fixed jig, and the other end abuts against the movable jig. A movable gap is provided between the movable jig and the fixed jig, the core shaft is drivingly connected to the fixed jig, and a second sealing ring is provided between the movable jig and the pitch circle jacket.

[0018] In one embodiment of the utility model, it also includes a connecting flange, a positioning groove is provided on the connecting flange, the main body is arranged on the positioning groove, the main body and the connecting flange are fixedly connected by connecting bolts, a guide hole is provided on the connecting flange, a pull rod is passed through the guide hole, and the pull rod is connected to the core shaft.

[0019] In one embodiment of the utility model, the pitch circle jacket includes a bottom plate, a plurality of clamping plates are evenly arranged on the edge of the bottom plate, a clamping groove is arranged on the clamping plate, a positioning protrusion is arranged on the side wall of the clamping groove, a first inclined surface is arranged on the opening edge of the clamping space, a second inclined surface is arranged on the free end of the clamping plate, and the first inclined surface is connected to the second inclined surface.

[0020] In one embodiment of the utility model, a mounting groove is provided on the free end of the clamping plate, a fixing block is provided on the mounting groove, and a guide pin is provided on the fixing block.

[0021] Beneficial effects of the utility model:

[0022] The utility model supports and positions the inner and outer sides of the gear by means of a fixed fixture and a movable fixture, and then drives the pitch circle clamp to move, so as to clamp and position the outer ring of the gear on the clamping station, and adopts end face positioning and multi-point pitch circle clamp to center and clamp the gear to avoid clamping deformation. Compared with the traditional 3-point clamping fixture, the clamping deformation is smaller, the roundness and tooth jump accuracy after processing are higher, the production change speed is faster, the tooth surface and one end surface of the gear are supported and positioned, and the processing allowance of the subsequent process can be smaller and more uniform, and the processing efficiency is higher. Compared with the imported film clamps from abroad, the utility model has lower price, higher accuracy and higher cost performance as a whole; the chip fluid sprayed out by the nozzle can cool the tooth surface of the gear, so as to ensure the end surface processing effect of the gear and improve the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The utility model is a schematic diagram of a quick-change pitch sleeve fixture.

[0024] Figure 2 It is a cross-sectional view of the utility model.

[0025] Figure 3 A top view of the utility model.

[0026] Explanation of the numbers in the figure: 1. body; 11. core shaft; 12. connecting flange; 13. piston rod; 14. movable hole; 15. pull rod; 2. gear; 3. cleaning block; 31. nozzle; 32. first flow channel; 33. second flow channel; 34. one-way valve; 35. third flow channel; 36. small hole; 4. clamping seat; 5. movable fixture; 6. fixed fixture; 7. pitch circle jacket; 71. bottom plate; 72. clamping plate; 73. clamping groove; 74. positioning protrusion; 75. second inclined surface; 76. first inclined surface; 8. limit screw; 81. limit groove; 82. connecting pin; 83. guide rod; 84. spring; 85. mounting groove; 86. fixed block; 87. guide pin; 9. second sealing ring; 91. first sealing ring; 92. fourth sealing ring; 100. movable gap. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0028] Reference Figure 1-3 , a quick-change pitch sleeve fixture, comprising:

[0029] A main body 1 is provided with a clamping space, a clamping seat 4 is provided in the clamping space, and the main body 1 is connected to the clamping seat 4;

[0030] A clamping assembly is arranged on the clamping space, and the clamping assembly includes a pitch circle jacket 7, which is sleeved on the clamping seat 4 and abuts against the inner side wall of the body 1, and is used to clamp and position the outer ring of the gear 2;

[0031] A positioning jig is arranged on the clamping seat 4, and the positioning jig includes a fixed jig 6 and a movable jig 5. The movable jig 5 is connected to the pitch circle jacket 7, and the movable jig 5 is sleeved on the fixed jig 6. The fixed jig 6 is arranged on the clamping seat 4. The movable jig 5 and the fixed jig 6 are both provided with positioning surfaces matching the end face of the gear 2. The fixed jig 6 and the movable jig 5 are used to support and position the inner and outer sides of the gear 2. The pitch circle jacket 7 and the positioning jig form a clamping station for the gear 2;

[0032] A mandrel 11 is disposed on the sliding hole of the body 1, and the mandrel 11 is drivingly connected to the pitch circle jacket 7. The mandrel 11 is used to drive the pitch circle jacket 7 to move so as to clamp and position the gear 2 on the clamping station;

[0033] A cleaning component is arranged on the movable fixture 5, and the cleaning component includes a cleaning block 3, and the cleaning block 3 is arranged on the movable fixture 5. A plurality of nozzles 31 for spraying cutting fluid are evenly arranged on the cleaning block 3, and the nozzles 31 are arranged toward the clamping station.

[0034] After the utility model supports and positions the inner and outer sides of the gear 2 by the fixed fixture 6 and the movable fixture 5, the core shaft 11 drives the pitch circle sleeve 7 to move, so as to clamp and position the outer ring of the gear 2 on the clamping station, and adopts end face positioning and multi-point pitch circle sleeve 7 to center and clamp the gear 2 to avoid clamping deformation. Compared with the traditional 3-point clamping fixture, the clamping deformation is smaller, the roundness and tooth jump accuracy after processing are higher, the production change speed is faster, the tooth surface and one end surface of the gear 2 are supported and positioned, and the processing allowance of the subsequent process can be smaller and more uniform, and the processing efficiency is higher. Compared with the imported film fixtures from abroad, the price is lower, the accuracy is higher, and the overall cost performance is high; the nozzle 31 sprays the chip liquid to cool the tooth surface of the gear 2, ensure the end surface processing effect of the gear 2, and improve the processing efficiency.

[0035] The utility model is suitable for the post-heat treatment processing of the gear 2, and is a solution specially provided for the post-heat treatment processing of the gear 2 and the pitch circle clamping.

[0036] In one embodiment of the utility model, a limiting hole is provided on the body 1 , a limiting screw 8 is provided on the limiting hole, a limiting groove 81 is provided on the outer wall of the pitch circle jacket 7 , and the limiting screw 8 is passed through the limiting groove 81 .

[0037] Specifically, when the core shaft 11 slides on the main body 1, the two side surfaces of the limiting groove 81 can abut against the limiting screw 8, so as to limit the reciprocating stroke of the core shaft 11, and the limiting adjustment operation is simple and fast.

[0038] In one embodiment of the utility model, the cleaning component also includes a first flow channel 32, the first flow channel 32 is arranged on the clamping seat 4, the first flow channel 32 is connected to the nozzle 31, the core shaft 11 is provided with a second flow channel 33 connected to the first flow channel 32, and the second flow channel 33 is provided with a one-way valve 34.

[0039] Specifically, the end face of the gear 2 is processed, and the cutting fluid is passed from the channel of the pull rod 15 to the second flow channel 33 on the core shaft 11. The cutting fluid flows to the first flow channel 32 through the one-way valve 34, and is sprayed on the gear 2 through the nozzle 31, thereby ensuring the end face processing effect of the gear 2 and improving the processing efficiency.

[0040] In one embodiment of the present invention, the cleaning component further includes a third flow channel 35 , which is connected to the second flow channel 33 . A small hole 36 is provided on the positioning surface of the movable fixture 5 , and the third flow channel 35 is connected to the small hole 36 .

[0041] Specifically, the cutting fluid passes through the third flow channel 35 and is sprayed from the small hole 36 to the tooth surface of the gear 2 , which can also cool the tooth surface of the gear 2 , thereby ensuring the end surface processing effect of the gear 2 and improving the processing efficiency.

[0042] In one embodiment of the utility model, a first sealing ring 91 is provided between the fixed fixture 6 and the movable fixture 5 , a third sealing ring is provided between the core shaft 11 and the body 1 , and a fourth sealing ring 92 is provided between the cleaning block 3 and the fixed fixture 6 .

[0043] In one embodiment of the utility model, a movable hole 14 is provided on the main body 1, and a piston rod 13 is provided on the core shaft 11. The piston rod 13 is slidably arranged on the movable hole 14. The thickness of the piston rod 13 is smaller than the depth of the movable hole 14, so that a movable gap is formed between the piston rod 13 and the movable hole 14. The assembly gap between the pitch circle sleeve 7 and the clamping seat 4 is smaller than the movable gap, so that the clamping formation of the gear 2 by the pitch circle sleeve 7 can be limited to avoid deformation of the gear 2 due to clamping.

[0044] Specifically, the piston rod 13 is slidably disposed on the movable hole 14 , which can limit the axial movement direction of the core shaft 11 , thereby preventing the piston rod 13 from being offset, thereby improving the operating stability of the entire core shaft 11 .

[0045] In one embodiment of the utility model, a guide rod 83 is provided on the movable jig 5, and the guide rod 83 is passed through the guide hole of the fixed jig 6. A spring 84 is provided on the guide rod 83, and one end of the spring 84 abuts against the fixed jig 6, and the other end abuts against the movable jig 5. A movable gap 100 is provided between the movable jig 5 and the fixed jig 6, the core shaft 11 is drivingly connected to the fixed jig 6, and a second sealing ring 9 is provided between the movable jig 5 and the pitch circle jacket 7.

[0046] A plurality of connecting pins 82 structures are provided between the movable jig 5 and the base plate 71, which is an existing linkage structure. Specifically, the connecting pins 82 are placed on the base plate 71, and a guide sleeve matching the connecting pins 82 is provided on the movable jig 5. A stopper is provided at the end of the connecting pin 82, so that the movable jig 5 cannot be detached from the connecting pin 82. The height of the connecting pin 82 is greater than or equal to the sum of the thickness of the movable jig 5 and the movable gap 100, so that the two-stage movement of the movable jig 5 can be realized, and the gear 2 is ejected from the pitch circle jacket 7 and the positioning jig to form a clamping station for the gear 2, so that the tooth surface of the gear 2 is detached from the positioning protrusion 74 and abuts against the guide pin 87 on the fixed block 86, thereby completing the rapid stripping of the gear 2.

[0047] In one embodiment of the utility model, it also includes a connecting flange 12, the connecting flange 12 is provided with a positioning groove, the main body 1 is arranged on the positioning groove, the main body 1 and the connecting flange 12 are fixedly connected by connecting bolts, the connecting flange 12 is provided with a guide hole, the guide hole is penetrated by a pull rod 15, and the pull rod 15 is connected to the core shaft 11.

[0048] Specifically, the connecting flange 12 is connected to the processing equipment, and the pull rod 15 is drivingly connected to the driving source of the processing equipment. The pull rod 15 is pulled by the driving source to ensure the rapid assembly of the fixture and improve the processing efficiency of the end face of the gear 2.

[0049] In one embodiment of the utility model, the pitch circle jacket 7 includes a bottom plate 71, a plurality of clamping plates 72 are evenly arranged on the edge of the bottom plate 71, a clamping groove 73 is arranged on the clamping plate 72, a positioning protrusion 74 is arranged on the side wall of the clamping groove 73, a first inclined surface 76 is arranged on the opening edge of the clamping space, a second inclined surface 75 is arranged on the free end of the clamping plate 72, and the first inclined surface 76 is connected to the second inclined surface 75.

[0050] Specifically, the mandrel 11 moves along the sliding hole in a direction away from the gear 2, pulling the movable fixture 5 and the pitch circle jacket 7 to move synchronously in a direction away from the gear 2, and the second inclined surface 75 on the clamping plate 72 moves along the first inclined surface 76 on the body 1, so that the multiple clamping plates 72 on the bottom plate 71 are synchronously clamped and positioned on the tooth surface of the gear 2, and the end face positioning and the pitch circle jacket 7 are used for centering clamping to avoid clamping deformation of the gear 2, and the clamping deformation is smaller, the roundness and tooth jump Fr accuracy after processing are higher, and the production change speed is faster;

[0051] A positioning protrusion 74 is provided on the side wall of the clamping groove 73, which clamps the tooth surface of the gear 2 on the pitch circle clamping sleeve 7, with uniform force and good positioning effect, so that the gear 2 will not loosen during processing.

[0052] In an embodiment of the present invention, a mounting groove 85 is provided on the free end of the clamping plate 72 , a fixing block 86 is provided on the mounting groove 85 , and a guide pin 87 is provided on the fixing block 86 .

[0053] Specifically, the guide pin 87 provided on the fixed block 86 places the gear 2 on the clamping station formed by the pitch circle sleeve 7 and the positioning fixture for the gear 2. The gear 2 is roughly guided by the guide pin 87 on the fixed block 86 and then dropped on the clamping station, thereby improving the clamping efficiency of the gear 2. At the same time, after the gear 2 is removed from the material, the guide pin 87 on the fixed block 86 abuts against the gear 2, so that the material receiving operation can be performed on it.

[0054] Usage process

[0055] The gear 2 is placed on a clamping station formed by the pitch circle sleeve 7 and the positioning fixture for the gear 2. The gear 2 is roughly guided by the guide pin 87 on the fixed block 86 and then dropped onto the movable fixture 5 and the fixed fixture 6. The gear 2 does not abut against the guide pin 87. The end face of the gear 2 is supported and positioned by the positioning surfaces on the movable fixture 5 and the fixed fixture 6. At the same time, the positioning protrusion 74 provided on the side wall of the clamping groove 73 is inserted between the two tooth gaps of the gear 2, so as to realize multi-point positioning of the end face and the tooth surface of the gear 2. The gear 2 is connected to the processing equipment through the connecting flange 12, and the pull rod 15 is connected to the driving source of the processing equipment. The pull rod 15 is pulled by the driving source, thereby driving the core shaft 11 to move along the sliding hole in the direction away from the gear 2, and pulling the movable fixture 5 and the pitch circle sleeve 7 synchronously toward Move in the direction away from the gear 2, the second inclined surface 75 on the clamping plate 72 moves along the first inclined surface 76 on the body 1, so that the multiple clamping plates 72 on the bottom plate 71 synchronously clamp and position the tooth surface of the gear 2, and adopt end surface positioning and pitch circle clamping sleeve 7 centering clamping to avoid clamping deformation of the gear 2. The clamping deformation is smaller, the roundness and tooth jump Fr accuracy after processing are higher, and the production change speed is faster. The processing process is carried out on the end surface of the gear 2, and the chip liquid is passed from the channel of the pull rod 15 to the second flow channel 33 on the core shaft 11. The chip liquid flows to the first flow channel 32 through the one-way valve 34, and the chip liquid is sprayed on the gear 2 through the nozzle 31. At the same time, the cutting fluid passes through the third flow channel 35 and is sprayed from the small hole 36 to the tooth surface position of the gear 2, ensuring the end surface processing effect of the gear 2 and improving the processing efficiency;

[0056] After the end surface machining of the gear 2 is completed, the pull rod 15 is pulled by the driving source, thereby driving the core shaft 11 to move along the sliding hole toward the direction of the gear 2, pulling the movable fixture 5 and the pitch circle jacket 7 to move synchronously toward the direction of the gear 2, and the second inclined surface 75 on the clamping plate 72 moves along the first inclined surface 76 on the body 1, so that the multiple clamping plates 72 on the bottom plate 71 synchronously loosen the tooth surface of the gear 2, and the pull rod 15 drives the core shaft 11 to continue to move toward the gear 2, pushing the movable fixture 5 to move along the guide rod 83 to compress the spring 84, and the movable fixture 5 and the fixed fixture 6 There is a movable gap 100 between them, the positioning surface of the movable fixture 5 contacts the end face of the gear 2, and the gear 2 is pushed out of the pitch circle sleeve 7 and the positioning fixture to form a clamping station for the gear 2, so that the tooth surface of the gear 2 is separated from the positioning protrusion 74 and abuts against the guide pin 87 on the fixed block 86, completing the rapid stripping of the gear 2. After the gear 2 is stripped, the movable fixture 5 returns to its position under the reaction force of the spring 84 until the movable fixture 5 abuts against the bottom plate 71, thereby completing the clamping of the gear 2, ensuring that the processing allowance of the subsequent process is smaller and more uniform, and the processing efficiency is higher. Compared with imported film clamps from abroad, it has lower prices, higher precision, and high overall cost performance.

[0057] The above-described embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. A quick-change pitch sleeve fixture, characterized in that: include: A body, on which a clamping space is provided, a clamping seat is provided in the clamping space, and the body is connected to the clamping seat; A clamping assembly is arranged on the clamping space, the clamping assembly comprises a pitch circle sleeve, the pitch circle sleeve is sleeved on the clamping seat, and the pitch circle sleeve abuts against the inner side wall of the body, and the pitch circle sleeve is used to clamp and position the outer ring of the gear; A positioning jig is arranged on the clamping seat, the positioning jig includes a fixed jig and a movable jig, the movable jig is connected to the pitch circle jacket, the movable jig is sleeved on the fixed jig, the fixed jig is arranged on the clamping seat, the movable jig and the fixed jig are both provided with positioning surfaces matching the end faces of the gears, the fixed jig and the movable jig are used to support and position the inner and outer sides of the gears, and the pitch circle jacket and the positioning jig form a clamping station for the gears; A mandrel, disposed on the sliding hole of the body, the mandrel being drivingly connected to the pitch circle jacket, and the mandrel being used to drive the pitch circle jacket to move so as to clamp and position the gear on the clamping station; A cleaning component is arranged on the movable fixture, and the cleaning component includes a cleaning block, and the cleaning block is arranged on the movable fixture. A plurality of nozzles for spraying cutting fluid are evenly arranged on the cleaning block, and the nozzles are arranged toward the clamping station.

2. The quick-change pitch sleeve fixture according to claim 1, characterized in that: A limiting hole is arranged on the main body, a limiting screw is arranged on the limiting hole, a limiting groove is arranged on the outer side wall of the pitch circle jacket, and the limiting screw is passed through the limiting groove.

3. The quick-change pitch sleeve fixture according to claim 1, characterized in that: The cleaning component also includes a first flow channel, which is arranged on the clamping seat and connected to the nozzle. A second flow channel connected to the first flow channel is arranged on the core shaft, and a one-way valve is arranged on the second flow channel.

4. The quick-change pitch sleeve fixture according to claim 3, characterized in that: The cleaning component further includes a third flow channel, the third flow channel is connected to the second flow channel, a small hole is provided on the positioning surface of the movable fixture, and the third flow channel is connected to the small hole.

5. The quick-change pitch sleeve fixture according to claim 1, characterized in that: A first sealing ring is arranged between the fixed fixture and the movable fixture, a third sealing ring is arranged between the core shaft and the body, and a fourth sealing ring is arranged between the cleaning block and the fixed fixture.

6. The quick-change pitch sleeve fixture according to claim 1, characterized in that: A moving hole is provided on the main body, and a piston rod is provided on the core shaft. The piston rod is slidably arranged on the moving hole. The thickness of the piston rod is smaller than the depth of the moving hole, so that a moving gap is formed between the piston rod and the moving hole, and the assembly gap between the pitch circle sleeve and the clamping seat is smaller than the moving gap.

7. The quick-change pitch sleeve fixture according to claim 1, characterized in that: The movable jig is provided with a guide rod, the guide rod is passed through the guide hole of the fixed jig, the guide rod is provided with a spring, one end of the spring abuts against the fixed jig, and the other end abuts against the movable jig, a movable gap is provided between the movable jig and the fixed jig, the core shaft is drivingly connected to the fixed jig, and a second sealing ring is provided between the movable jig and the pitch circle jacket.

8. The quick-change pitch sleeve fixture according to claim 1, characterized in that: It also includes a connecting flange, which is provided with a positioning groove, the main body is arranged on the positioning groove, the main body and the connecting flange are fixedly connected by connecting bolts, the connecting flange is provided with a guide hole, the guide hole is penetrated by a pull rod, and the pull rod is connected to the core shaft.

9. The quick-change pitch sleeve fixture according to claim 1, characterized in that: The pitch circle jacket includes a bottom plate, a plurality of clamping plates are evenly arranged on the edge of the bottom plate, a clamping groove is arranged on the clamping plate, a positioning protrusion is arranged on the side wall of the clamping groove, a first inclined surface is arranged on the opening edge of the clamping space, a second inclined surface is arranged on the free end of the clamping plate, and the first inclined surface is connected to the second inclined surface.

10. The quick-change pitch sleeve fixture according to claim 9, characterized in that: A mounting groove is arranged on the free end of the clamping plate, a fixing block is arranged on the mounting groove, and a guide pin is arranged on the fixing block.

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