Multi-station pneumatic linkage type sewing machine shaft sleeve machining, positioning and clamping device

Abstract

The invention relates to the technical field of sewing machine machining, in particular to a multi-station pneumatic linkage type sewing machine shaft sleeve machining, positioning and clamping device which comprises a driving device, radial fixing devices, an axial pressing device and a limiting device. The radial fixing device expands in the radial direction to abut against the inner wall of the sewing machine shaft sleeve after bearing jacking force, and when the radial fixing device slides under the jacking force, the axial pressing device is driven to turn over to axially press the end face of the sewing machine shaft sleeve, and the shaft sleeve is fixed in a matched mode in the radial direction and the axial direction at the same time. After the limiting device is clamped in a sliding mode, rigid supporting can be formed on the shaft sleeve of the sewing machine, and it is further guaranteed that the shaft sleeve of the sewing machine cannot deviate; the problems that pneumatic clamping force is not stable, and high-frequency vibration generated in the milling process can cause macro movement of a shaft sleeve of the sewing machine are solved.

Description

Technical Field

[0001] The invention relates to the technical field of sewing machine processing, and in particular to a multi-station pneumatic linkage type sewing machine shaft sleeve processing positioning and clamping device. Background Art

[0002] Sewing machine bushings are key parts used to support, position and fix the rotating shaft in sewing machines. They are usually installed on the main shaft, transmission shaft and connecting rod mechanism of the sewing machine. Sewing machine bushings need to adapt to high-frequency forward and reverse rotation, and the speed of industrial sewing machines can reach 5000-8000rpm, so compared with ordinary bushings, sewing machine bushings require higher coaxiality and smaller surface roughness.

[0003] At present, when processing the shaft sleeve of a sewing machine, a three-jaw chuck or other self-centering clamp is usually used for fixing. However, when milling the side of the shaft sleeve of a sewing machine, the milling force generated by the tool will cause the workpiece to deviate radially, thereby reducing the processing accuracy. In addition, when the three-jaw chuck is clamped at multiple stations at the same time, it needs to be clamped manually one by one, and the clamping efficiency is low. The prior art has proposed a good solution to this problem, such as the pneumatic fully automatic positioning clamping device for the milling side of the industrial sewing machine D shaft sleeve with patent publication number CN204524918U, which uses a front limit block, a limit spring and a rear limit block to achieve the initial fixation of the workpiece, and then drives the front end of the clamping plate to press the workpiece downward through the clamping cylinder and the block to achieve a close fit. The clamping method is stable and firm, which can ensure the accuracy of the milling side processing and improve the qualified rate of the product. It has a high degree of automation and a fast clamping speed, which can simplify the clamping process and improve the clamping efficiency. In addition, it can clamp and process multiple workpieces at the same time to improve work efficiency.

[0004] Although the prior art solves the problems of workpiece offset caused by milling force during machining of conventional self-centering fixtures, low machining accuracy and low clamping efficiency during simultaneous machining of multiple stations, the following problems still exist: by using a limit fixing method to initially fix the sleeve and then press down the end face to replace radial fixation, although manual clamping is not required and the clamping efficiency can be improved, multiple sleeves need to be processed every day during production on the production line. At this time, the fixed limit structure and the sleeve will wear under the milling force. After the limit structure is worn, the sleeve cannot be accurately centered before pressing down, and there is a deviation between the tool path and the sleeve position, which leads to reduced sleeve machining accuracy. After the limit structure is worn, there will be space for the sleeve to move in the radial direction during the cutting process and uneven distribution of the radial fixing force. High-frequency collisions occur between the tool and the sleeve during milling. Due to the fluctuation of the clamping force provided by the pneumatic clamping, when the friction force generated by the end face clamping is lower than the radial force generated by milling, the sewing machine sleeve will still move slightly, and when the end face clamping force is too large, the sleeve end face will be damaged.

[0005] In view of the above situation, in order to overcome the above technical problems, the present invention designs a multi-station pneumatic linkage sewing machine shaft sleeve processing positioning clamping device. Summary of the invention

[0006] The present invention provides a multi-station pneumatic linkage sewing machine shaft sleeve processing positioning clamping device, which solves the problem that the pneumatic clamping force is unstable and the high-frequency vibration generated during the milling process will cause the sewing machine shaft sleeve to move slightly. By arranging a driving device, a radial fixing device and an axial clamping device to cooperate with each other, the driving device can drive multiple radial fixing devices and axial clamping devices to fix multiple shaft sleeves at the same time when it is started, thereby improving the fixing efficiency; and the shaft sleeves can be matched and fixed in both radial and axial directions at the same time, thereby ensuring the accurate positioning of the shaft sleeve and the coaxiality of milling, and the axial clamping device can drive the limiting device to slide on the radial fixing device and complete the clamping while fixing, and after the clamping, a rigid support will be formed for the sewing machine shaft sleeve, thereby further ensuring that the sewing machine shaft sleeve will not be offset.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A multi-station pneumatic linkage sewing machine shaft sleeve processing positioning clamping device, comprising a positioning seat; also comprising a driving device, a radial fixing device, an axial pressing device and a limiting device; the upper surface of the positioning seat is provided with a positioning hole, and the interior is provided with a driving groove; the driving device is arranged in the driving groove; the radial fixing device is slidably installed in the positioning hole and connected to the driving device, and the driving device is powered on and started and simultaneously pushes a plurality of radial fixing devices, and the radial fixing devices are radially expanded and press the inner wall of the sewing machine shaft sleeve after being subjected to the thrust; the axial pressing device is connected to the radial fixing device, and when the radial fixing device slides under the thrust, it drives the axial pressing device to flip and axially press the end face of the sewing machine shaft sleeve; the limiting device is connected to the radial fixing device, and when the axial pressing device flips, it drives the limiting device to slide radially on the radial fixing device, and after the limiting device slides and is pressed against the inner wall of the sewing machine shaft sleeve, it cannot perform radial and axial movements.

[0009] Preferably, the driving device includes a driving cylinder, a push-up plate and a return spring; the driving cylinder is arranged in a driving groove; the push-up plate is slidably installed in the driving groove and connected to the driving cylinder; the return spring is connected between the push-up plate and the driving groove.

[0010] In the above scheme, the lifting and lowering activities of the push-up plate can be freely controlled by driving the cylinder, and when the push-up plate is pushed up, it can drive multiple radial fixing devices to simultaneously position and fix multiple sewing machine sleeves, thereby realizing multi-station linkage control. It is only necessary to place the sewing machine sleeve on the positioning seat and start the driving cylinder. The push-up plate will simultaneously drive multiple radial fixing devices and axial clamping devices to complete the simultaneous positioning and fixing of multiple sewing machine sleeves, saving clamping time and improving production efficiency. When the processing is completed, the driving cylinder will be reset, the reset spring will pull the push-up plate to reset, and the multiple radial fixing devices and axial clamping devices will simultaneously release the sewing machine sleeves for easy removal.

[0011] Preferably, the radial fixing device includes a centering groove, a tetrahedron and a centering clamp; a circular array of the centering grooves is provided on the positioning seat, with a total of four; the tetrahedron is connected to the push-up plate, and a lifting groove is provided on the tetrahedron; the head of the centering clamp is slidably installed in the centering groove, and the tail is slidably installed in the lifting groove.

[0012] In the above scheme, when the driving device is lifted upward, the push-up plate will lift multiple tetrahedral cones at the same time, thereby realizing multi-station clamping at the same time. When the tetrahedral cone is lifted, the inclined surface of the lifting slide groove will squeeze the inclined surface of the tail of the centering clamp, thereby driving the four centering clamps to slide at the same time. Since the four centering clamps slide synchronously, the center of the sewing machine sleeve can be aligned.

[0013] Preferably, the angle between the plane where the lifting chute is located and the horizontal plane is greater than 45 degrees.

[0014] In the above scheme, when the angle between the plane where the lifting chute is located and the horizontal plane is greater than 45 degrees, the normal pressure generated by the centering clamp on the inclined surface of the lifting chute is decomposed into the horizontal and vertical directions, and the force decomposed in the vertical direction is small. At this time, the centering clamp sliding in the horizontal direction will be more difficult to push the tetrahedron to move in the vertical direction after being subjected to the milling force, thereby ensuring that the milling force is not easy to push the sewing machine sleeve to move.

[0015] Preferably, the axial clamping device includes a fulcrum seat, a positioning claw and a connecting rod; the fulcrum seat is arranged in a circular array on the inner wall of the positioning hole; the positioning claw is rotatably connected to the fulcrum seat; a connecting groove is provided on the tail of the four-sided cone; the connecting rod is connected between the connecting groove and the positioning claw.

[0016] In the above scheme, when the tetrahedron rises, it will drive the connecting rod and one end of the connecting groove to move up together. At this time, the connecting rod will pull the positioning claw to rotate around the fulcrum seat. At this time, the positioning claw will press the end face of the sewing machine sleeve, thereby preventing the sewing machine sleeve from moving in the axial direction, and can push the sewing machine sleeve in the axial and radial directions at the same time to achieve a matching positioning effect, thereby ensuring that the coaxiality error of the sewing machine sleeve processing is minimized.

[0017] Preferably, the limiting device includes a lifting shaft, a driving tooth, a limiting push block, a connecting spring, a clamping assembly and a lifting spring; a limiting sliding hole is opened in the center of the four-sided cone; the lifting shaft is slidably installed in the limiting sliding hole, and a lifting tooth is arranged at the lower part of the lifting shaft; the driving tooth is arranged at the tail of the connecting rod; the limiting push block is slidably installed on the centering clamp; the connecting spring is connected between the limiting push block and the centering clamp; the clamping assembly is connected to the lifting shaft; the lifting spring is connected between the lifting shaft and the lifting plate.

[0018] In the above scheme, when the tetrahedron moves upward, the connecting rod will rotate. At this time, the connecting rod will cooperate with the lifting teeth at the rear end and the lifting teeth at the lower part of the lifting shaft, thereby driving the lifting shaft to move upward. Since the lifting shaft itself rises together with the tetrahedron and further rises under the drive of the driving teeth, the lifting shaft will rise to a higher height relative to the tetrahedron. Since the limit push block is slidably mounted on the centering clamp, when the centering clamp slides, the limit push block will be driven to slide with the centering clamp through the connecting spring. At this time, the lifting shaft will slide further compared with the tetrahedron, which will cause the lifting shaft to drive the limit push block to push further, thereby providing a higher clamping force than the centering clamp. When it slides to the clamping assembly and is clamped, a limit will be formed, which makes the lifting shaft unable to slide in the vertical direction and the limit push block unable to slide radially. At this time, even if the driving cylinder fluctuates, the sewing machine sleeve will not move radially under the milling force, thereby ensuring the processing accuracy.

[0019] Preferably, a pressure groove is provided on the head of the centering clamping jaw; a rubber push block is provided on the head of the limiting push block; and the rubber push block is slidably installed in the pressure groove.

[0020] In the above scheme, since the sliding height of the lifting shaft is higher than that of the four-sided cone, further pushing space will be created for the limit push block, so that the limit push block is displaced longer in the radial direction than the centering clamp. At this time, the rubber push block slides in the pressure groove on the head of the centering clamp and presses against the inner wall of the sewing machine sleeve. Since the outer surface of the rubber push block is a hard rubber structure, it can be deformed during the extrusion process, and will not cause damage to the inner wall of the sewing machine sleeve while maintaining the press.

[0021] Preferably, the clamping assembly includes a limit groove, an ejection groove, a limit slider, a limit spring and a pressure relief groove; the limit groove is arranged at the tail of the limit push block; the circumferential array of ejection grooves is arranged at the upper part of the jacking shaft; the limit slider is slidably installed in the ejection groove, and a pressure relief block is arranged at the tail of the limit slider; the limit spring is connected between the limit slider and the ejection groove; the pressure relief groove is arranged at the top of the jacking shaft and connects multiple ejection grooves.

[0022] In the above scheme, when the lifting shaft is lifted to the point where the limit groove and the ejection groove coincide, the limit slider will be ejected under the action of the limit spring and jammed into the limit groove. At this time, due to the existence of the limit slider and the inability of the limit push block to move in the vertical direction, the lifting shaft will also be unable to move in the vertical direction, and the tail of the limit push block and the top of the lifting shaft are in a completely compressed state, so the limit push block will also be unable to move radially, which will form a rigid support for the inner wall of the sewing machine sleeve to ensure that the sewing machine sleeve cannot move radially.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. Compared with the existing sleeve positioning and clamping device, the present invention is provided with a driving device, a radial fixing device and an axial pressing device; when the driving cylinder is started, it can drive multiple radial fixing devices to work simultaneously, complete the radial pressing of the sewing machine sleeve, thereby completing the self-centering process and ensuring the processing accuracy; in the process of fixing the radial fixing device, the axial pressing device will be driven to perform axial pressing at the same time, and the sewing machine sleeve is adjusted by axial and radial coordination, so that when the outer wall of the sewing machine sleeve is milled, the coaxiality with the inner wall can be ensured, thereby achieving the required processing accuracy of the sewing machine sleeve, and the radial support and axial pressing can prevent the sewing machine sleeve from axially jumping when it is subjected to the milling force, and the friction force generated by the pressing can further improve the fixing effect, and the angle between the plane where the lifting slide groove is located and the horizontal plane is greater than 45 degrees, so that the four-sided cone can be tightened upward with less force on the sewing machine sleeve, and it will be more difficult for the milling force to cause the sewing machine sleeve to deviate, thereby further ensuring the processing accuracy of the sewing machine sleeve.

[0025] 2. The present invention sets a limit device. When the tetrahedral cone is lifted upward, the connecting rod will be driven to rotate. When the connecting rod rotates, the lifting shaft will move upward. Since the lifting shaft itself rises together with the tetrahedral cone and further rises under the drive of the connecting rod, the lifting shaft will rise to a higher height relative to the tetrahedral cone. At this time, the lifting shaft will drive the limit push block to radially press the inner wall of the sewing machine sleeve. The limit push block has a longer displacement in the radial direction than the centering clamp. At this time, the pressure of the rubber push block on the head of the limit push block on the head of the centering clamp It slides in the groove and presses against the inner wall of the sewing machine sleeve. Since the outer surface of the rubber push block is a hard rubber structure, it can be deformed during the extrusion process. While maintaining the press, it will not cause damage to the inner wall of the sewing machine sleeve. It can absorb vibration and utilize the deformation effect of the rubber push block. The elastic force in the opposite direction to the radial force generated by milling can increase with the increase of the radial force generated by milling, thereby realizing dynamic adjustment of the clamping force to prevent clamping looseness caused by thermal deformation during milling and crushing caused by excessive clamping force, thereby ensuring the machining accuracy of the sewing machine sleeve.

[0026] 3. The present invention sets a snap-in assembly. When the lifting shaft is lifted to the point where the limit groove and the ejection groove coincide, the limit slider will be ejected under the action of the limit spring and snapped into the limit groove. At this time, due to the existence of the limit slider and the inability of the limit push block to move in the vertical direction, the lifting shaft will also be unable to move in the vertical direction. The tail of the limit push block and the top of the lifting shaft are in a completely pressed state and the rubber push block is compressed to a state where it cannot be further compressed. Therefore, the limit push block cannot move radially either. At this time, a rigid support will be formed for the inner wall of the sewing machine sleeve to ensure that the sewing machine sleeve cannot move radially. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is the overall structure diagram of the present invention;

[0029] Figure 2 It is a schematic diagram of the internal structure of the positioning seat of the present invention;

[0030] Figure 3 It is a three-dimensional cross-sectional view of the radial fixing device of the present invention;

[0031] Figure 4 It is a plan cross-sectional view of the radial fixing device of the present invention;

[0032] Figure 5 for Figure 4 A magnified view of the structure at center;

[0033] Figure 6 It is a cross-sectional view of the axial clamping device of the present invention;

[0034] Figure 7 for Figure 4 A magnified view of the structure at B in the middle;

[0035] Figure 8 for Figure 6 A magnified view of the structure at C in the middle;

[0036] In the figure: 1, positioning seat; 11, positioning hole; 12, driving groove; 2, driving device; 21, driving cylinder; 22, lifting plate; 23, reset spring; 3, radial fixing device; 31, centering slide groove; 32, four-sided cone; 321, lifting slide groove; 322, connecting rotation groove; 323, limiting slide hole; 33, centering clamping claw; 4, axial clamping device; 41, fulcrum seat; 42, positioning pressing claw; 421, Pressure groove; 43, connecting rod; 5, limiting device; 51, lifting shaft; 511, lifting tooth; 52, driving tooth; 53, limiting push block; 531, rubber push block; 54, connecting spring; 55, clamping assembly; 551, limiting groove; 552, ejection groove; 553, limiting slider; 5531, pressure relief block; 554, limiting spring; 555, pressure relief groove; 56, lifting spring; 6, sewing machine sleeve. DETAILED DESCRIPTION

[0037] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0038] See also Figures 1 to 8 The present invention provides a multi-station pneumatic linkage sewing machine sleeve processing positioning and clamping device, and the technical solution is as follows:

[0039] As a specific embodiment of the present invention, refer to Figure 1 and Figure 2A multi-station pneumatic linkage sewing machine sleeve processing positioning clamping device, comprising a positioning seat 1; further comprising a driving device 2, a radial fixing device 3, an axial pressing device 4 and a limiting device 5; the upper surface of the positioning seat 1 is provided with a positioning hole 11, and the interior is provided with a driving groove 12; the driving device 2 is arranged in the driving groove 12; the radial fixing device 3 is slidably installed in the positioning hole 11 and is connected to the driving device 2, the driving device 2 is powered on and starts to push a plurality of radial fixing devices 3 at the same time, and the radial fixing device 3 is radially expanded and pressed against the inner wall of the sewing machine sleeve 6 after being subjected to the thrust; the axial pressing device 4 is connected to the radial fixing device 3, and when the radial fixing device 3 is subjected to the thrust and slides, it drives the axial pressing device 4 to flip and axially press the end face of the sewing machine sleeve 6; the limiting device 5 is connected to the radial fixing device 3, and when the axial pressing device 4 flips, it drives the limiting device 5 to slide radially on the radial fixing device 3, and the limiting device 5 cannot move radially and axially after sliding to the inner wall of the sewing machine sleeve 6.

[0040] As a specific embodiment of the present invention, refer to Figure 2 and Figure 3 The driving device 2 includes a driving cylinder 21, a push-up plate 22 and a return spring 23; the driving cylinder 21 is arranged in the driving groove 12; the push-up plate 22 is slidably installed in the driving groove 12 and connected to the driving cylinder 21; the return spring 23 is connected between the push-up plate 22 and the driving groove 12. By driving the cylinder 21, the lifting and lowering activities of the push-up plate 22 can be freely controlled, and when the push-up plate 22 is pushed up, it can drive multiple radial fixing devices 3 to simultaneously position and fix multiple sewing machine sleeves 6, thereby realizing multi-station linkage control. It is only necessary to place the sewing machine sleeve 6 on the positioning seat 1 and start the driving cylinder 21. The push-up plate 22 will simultaneously drive multiple radial fixing devices 3 and axial clamping devices 4 to complete the simultaneous positioning and fixing of multiple sewing machine sleeves 6, saving clamping time and improving production efficiency; when the processing is completed, the driving cylinder 21 is reset, the reset spring 23 will pull the push-up plate 22 to reset, and the multiple radial fixing devices 3 and axial clamping devices 4 will simultaneously release the sewing machine sleeve 6 for easy removal.

[0041] As a specific embodiment of the present invention, refer to Figure 2 and Figure 3The radial fixing device 3 includes a centering slot 31, a tetrahedron 32 and a centering clamp 33; the centering slot 31 is arranged in a circumferential array on the positioning seat 1, and there are four of them in total; the tetrahedron 32 is connected to the push-up plate 22, and a lifting slot 321 is arranged on the tetrahedron 32; the head of the centering clamp 33 is slidably installed in the centering slot 31, and the tail is slidably installed in the lifting slot 321. When the driving device 2 is lifted upward, the push-up plate 22 will lift multiple tetrahedrons 32 at the same time, thereby realizing multi-station simultaneous clamping. When the tetrahedron 32 is lifted, the inclined surface of the lifting slot 321 will press against the inclined surface of the tail of the centering clamp 33, thereby driving the four centering clamps 33 to slide at the same time. Since the four centering clamps 33 slide synchronously, the center of the sewing machine shaft sleeve 6 can be aligned.

[0042] As a specific embodiment of the present invention, refer to Figure 3 , the angle between the plane where the lifting chute 321 is located and the horizontal plane is greater than 45 degrees. When the angle between the plane where the lifting chute 321 is located and the horizontal plane is greater than 45 degrees, the normal pressure generated by the centering clamp 33 on the inclined surface of the lifting chute 321 is decomposed into the horizontal direction and the vertical direction, and the force decomposed into the vertical direction is small. At this time, the centering clamp 33 sliding in the horizontal direction will be more difficult to push the tetrahedron 32 to move in the vertical direction after being subjected to the milling force, thereby ensuring that the milling force is not easy to push the sewing machine shaft sleeve 6 to move.

[0043] As a specific embodiment of the present invention, refer to Figure 3 , Figure 4 and Figure 6 The axial clamping device 4 includes a fulcrum seat 41, a positioning claw 42 and a connecting rod 43; the fulcrum seat 41 is arranged in a circular array on the inner wall of the positioning hole 11; the positioning claw 42 is rotatably connected to the fulcrum seat 41. When processing the sewing machine sleeve 6 of the same specification on the same production line, the clamping surface of the positioning claw 42 can be adjusted to ensure that the clamping effect is ensured by surface contact after flipping; a connecting groove 322 is opened on the tail of the tetrahedron 32; the connecting rod 43 is connected between the connecting groove 322 and the positioning claw 42. When the tetrahedron 32 rises, it will drive the connecting rod 43 and the end connected to the connecting groove 322 to move upward together. At this time, the connecting rod 43 will pull the positioning claw 42 to rotate around the fulcrum seat 41. At this time, the positioning claw 42 will press the end face of the sewing machine sleeve 6 to prevent the sewing machine sleeve 6 from moving in the axial direction, and can push the sewing machine sleeve 6 in the axial and radial directions at the same time to achieve a matching positioning effect, thereby ensuring that the coaxiality error of the sewing machine sleeve 6 is minimized.

[0044] As a specific embodiment of the present invention, refer to Figure 4 , Figure 6 , Figure 7 and Figure 8 The limiting device 5 includes a lifting shaft 51, a driving tooth 52, a limiting push block 53, a connecting spring 54, a clamping assembly 55 and a lifting spring 56; a limiting sliding hole 323 is provided at the center of the tetrahedron 32; the lifting shaft 51 is slidably installed in the limiting sliding hole 323, and a lifting tooth 511 is provided at the lower part of the lifting shaft 51; the driving tooth 52 is provided at the tail of the connecting rod 43; the limiting push block 53 is slidably installed on the centering clamp 33, and the contact surface between the tail of the limiting push block 53 and the top of the lifting shaft 51 is set as an inclined surface, and the angle of the inclined surface is the same as that of the lifting slide groove 321; the connecting spring 54 is connected between the limiting push block 53 and the centering clamp 33; the clamping assembly 55 is connected to the lifting shaft 51; the lifting spring 56 is connected between the lifting shaft 51 and the lifting plate 22. When the tetrahedral pyramid 32 moves upward, the connecting rod 43 will rotate. At this time, the connecting rod 43 will cooperate with the lifting teeth 511 at the lower part of the lifting shaft 51 through the driving teeth 52 at the tail, thereby driving the lifting shaft 51 to move upward. Since the lifting shaft 51 itself rises together with the tetrahedral pyramid 32 and further rises under the drive of the driving teeth 52, the lifting shaft 51 will rise to a higher height relative to the tetrahedral pyramid 32. Since the limit push block 53 is slidably mounted on the centering jaw 33, when the centering jaw 33 slides, it will pass through the connecting rod 43. The connecting spring 54 drives the limit push block 53 to slide together with the centering clamp 33. At this time, the lifting shaft 51 slides further than the tetrahedron 32, which will cause the lifting shaft 51 to drive the limit push block 53 to be further pushed, thereby providing a higher clamping force than the centering clamp 33, and when it slides to the clamping assembly 55 and is clamped, a limit will be formed, so that the lifting shaft 51 cannot slide in the vertical direction, and the limit push block 53 cannot slide in the radial direction. At this time, even if the driving cylinder 21 fluctuates, the sewing machine sleeve 6 will not move radially under the milling force, thereby ensuring the processing accuracy.

[0045] As a specific embodiment of the present invention, refer to Figure 5, the head of the centering clamp 33 is provided with a pressure groove 421; the head of the limit push block 53 is provided with a rubber push block 531; the rubber push block 531 is slidably installed in the pressure groove 421. Since the lifting shaft 51 has a higher sliding height than the tetrahedral cone 32, further pushing space will be generated for the limit push block 53, so that the limit push block 53 is displaced longer in the radial direction than the centering clamp 33. At this time, the rubber push block 531 slides in the pressure groove 421 of the head of the centering clamp 33 and presses against the inner wall of the sewing machine sleeve 6. Since the outer surface of the rubber push block 531 is a hard rubber structure, it can be deformed during the extrusion process. While maintaining the press, it will not cause damage to the inner wall of the sewing machine sleeve 6. Moreover, when the rubber push block 531 is completely pressed against the inner wall of the sewing machine sleeve 6, it will not be able to continue to compress or the compressible range is less than the allowable processing error range, thereby ensuring that the stability of the support and the processing accuracy are within the allowable error range.

[0046] As a specific embodiment of the present invention, refer to Figure 7 The clamping assembly 55 includes a limit groove 551, an ejection groove 552, a limit slider 553, a limit spring 554 and a pressure relief groove 555; the limit groove 551 is provided at the tail of the limit push block 53; the ejection groove 552 is provided in a circular array at the upper part of the lifting shaft 51; the limit slider 553 is slidably installed in the ejection groove 552, and a pressure relief block 5531 is provided at the tail of the limit slider 553. When the sewing machine sleeve 6 needs to be removed after milling is completed, The four pressure relief blocks 5531 only need to be squeezed toward the center of the circle to release the engagement. At this time, the lifting shaft 51 will be pulled down and reset under the pulling action of the lifting spring 56, and the limit push block 53 will remove the pressure clamping on the sewing machine sleeve 6 under the elastic force of the connecting spring 54; the limit spring 554 is connected between the limit slider 553 and the ejection groove 552; the pressure relief groove 555 is opened at the top of the lifting shaft 51 and connects multiple ejection grooves 552. When the lifting shaft 51 is lifted to the point where the limit groove 551 and the ejection groove 552 coincide, the limit slider 553 will be ejected under the action of the limit spring 554 and be locked in the limit groove 551. At this time, due to the existence of the limit slider 553 and the inability of the limit push block 53 to move in the vertical direction, the lifting shaft 51 will also be unable to move in the vertical direction. At this time, the tail of the limit push block 53 and the top of the lifting shaft 51 are in a completely tightened state, so the limit push block 53 cannot move radially either. At this time, a rigid support will be formed for the inner wall of the sewing machine sleeve 6 to ensure that the sewing machine sleeve 6 cannot move radially.

[0047] Working process: start the driving cylinder 21, the driving cylinder 21 pushes the lifting plate 22 to lift multiple tetrahedral cones 32 at the same time, at this time, the lifting groove 321 on the tetrahedral cone 32 will squeeze the centering claw 33, the centering claw 33 will slide radially to complete the centering and radial fixation of the sewing machine sleeve 6, and in the process of the tetrahedral cone 32 rising, it will drive the connecting rod 43 to flip, and the flipping of the connecting rod 43 will drive the positioning claw 42 to flip and press the end face of the sewing machine sleeve 6 to complete the axial fixation.

[0048] Specifically, first place the sewing machine shaft sleeve 6 on the positioning seat 1, and then start the driving cylinder 21. In order to realize multi-station linkage clamping and improve the clamping efficiency, the driving cylinder 21 will simultaneously push the multiple tetrahedral pyramids 32 to perform jacking movement through the pushing plate 22. When the tetrahedral pyramid 32 performs jacking movement, the tail of the centering clamp 33 will be squeezed by the inclined surface of the jacking slide 321. At this time, the centering clamp 33 will perform radial movement under the mutual squeezing of the inclined surfaces. The synchronous radial movement of the four centering clamps 33 will radially fix the sewing machine shaft sleeve 6 placed on the positioning seat 1 and realize self-centering; when the tetrahedral pyramid 32 is lifted, it will The connecting rod 43 is driven to flip, and the rotation of the connecting rod 43 will drive the positioning claw 42 to rotate. The positioning claw 42 rotates to press the end face of the sewing machine sleeve 6 to complete axial fixation, and because the positioning claw 42 and the centering clamping jaw 33 are synchronously fixed in the axial direction and in the radial direction, the coaxiality error of the sewing machine sleeve 6 is minimized; when the connecting rod 43 rotates, the driving tooth 52 at the tail will push the lifting tooth 511 at the lower part of the lifting shaft 51 to slide upward. Since the lifting shaft 51 itself rises together with the tetrahedral pyramid 32, and further rises under the drive of the driving tooth 52, the lifting shaft 51 is relatively close to the tetrahedral pyramid 3 2 will rise to a higher height. At this time, the inclined surface at the top of the lifting shaft 51 and the inclined surface at the tail of the limiting push block 53 squeeze each other, so that the limiting push block 53 slides on the centering clamp 33, and the limiting push block 53 is displaced longer in the radial direction than the centering clamp 33. At this time, the rubber push block 531 at the head of the limiting push block 53 slides in the pressure groove 421 at the head of the centering clamp 33 and presses against the inner wall surface of the sewing machine sleeve 6. Since the outer surface of the rubber push block 531 is a hard rubber structure, it can be deformed during the extrusion process. While maintaining the pressing, it will not cause damage to the inner wall surface of the sewing machine sleeve 6, and the lifting process of the lifting shaft 51 The limit groove 551 and the ejection groove 552 will gradually overlap. When the two are completely overlapped, the limit slider 553 will be ejected under the action of the limit spring 554 and inserted into the limit groove 551. At this time, due to the existence of the limit slider 553 and the limit push block 53 cannot move in the vertical direction, the lifting shaft 51 will also be unable to move in the vertical direction. At this time, the tail of the limit push block 53 and the top of the lifting shaft 51 are in a completely pressed state, so the limit push block 53 cannot move radially. At this time, a rigid support will be formed on the inner wall of the sewing machine sleeve 6 to ensure that the sewing machine sleeve 6 cannot move radially, thereby ensuring the processing accuracy.

[0049] The above shows and describes 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 to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A multi-station pneumatic linkage sewing machine sleeve processing positioning and clamping device, comprising a positioning seat (1); characterized in that: The invention also comprises a driving device (2), a radial fixing device (3), an axial pressing device (4) and a limiting device (5); a positioning hole (11) is provided on the upper surface of the positioning seat (1), and a driving groove (12) is provided inside the positioning seat (1); the driving device (2) is arranged in the driving groove (12); the radial fixing device (3) is slidably installed in the positioning hole (11) and is connected to the driving device (2); the driving device (2) is powered on and starts to push a plurality of radial fixing devices (3) at the same time; the radial fixing devices (3) are radially expanded and pressed to sew after receiving the pushing force The inner wall of the sewing machine shaft sleeve (6); the axial pressing device (4) is connected to the radial fixing device (3); when the radial fixing device (3) slides under the thrust force, it drives the axial pressing device (4) to flip and axially press the end face of the sewing machine shaft sleeve (6); the limiting device (5) is connected to the radial fixing device (3); when the axial pressing device (4) flips, it drives the limiting device (5) to slide radially on the radial fixing device (3); after the limiting device (5) slides to press against the inner wall of the sewing machine shaft sleeve (6), it cannot move radially or axially.

2. A multi-station pneumatic linkage sewing machine sleeve processing positioning clamping device according to claim 1, characterized in that: The driving device (2) comprises a driving cylinder (21), a push-up plate (22) and a return spring (23); the driving cylinder (21) is arranged in the driving groove (12); the push-up plate (22) is slidably mounted in the driving groove (12) and connected to the driving cylinder (21); and the return spring (23) is connected between the push-up plate (22) and the driving groove (12).

3. The multi-station pneumatic linkage sewing machine sleeve processing positioning and clamping device according to claim 2, characterized in that: The radial fixing device (3) comprises a centering slide groove (31), a tetrahedron (32) and a centering clamp (33); the centering slide groove (31) is arranged in a circular array on the positioning seat (1), and a total of four are arranged; the tetrahedron (32) is connected to the push-up plate (22), and a lifting slide groove (321) is arranged on the tetrahedron (32); the head of the centering clamp (33) is slidably mounted in the centering slide groove (31), and the tail is slidably mounted in the lifting slide groove (321).

4. The multi-station pneumatic linkage sewing machine sleeve processing positioning and clamping device according to claim 3, characterized in that: The angle between the plane where the lifting chute (321) is located and the horizontal plane is greater than 45 degrees.

5. The multi-station pneumatic linkage sewing machine sleeve processing positioning and clamping device according to claim 3, characterized in that: The axial clamping device (4) comprises a fulcrum seat (41), a positioning pressure claw (42) and a connecting rod (43); the fulcrum seat (41) is arranged in a circumferential array on the inner wall of the positioning hole (11); the positioning pressure claw (42) is rotatably connected to the fulcrum seat (41); a connecting groove (322) is provided on the tail of the tetrahedral pyramid (32); and the connecting rod (43) is connected between the connecting groove (322) and the positioning pressure claw (42).

6. A multi-station pneumatic linkage sewing machine sleeve processing positioning and clamping device according to claim 5, characterized in that: The limiting device (5) comprises a lifting shaft (51), a driving tooth (52), a limiting push block (53), a connecting spring (54), a clamping assembly (55) and a lifting spring (56); a limiting sliding hole (323) is provided at the center of the tetrahedral cone (32); the lifting shaft (51) is slidably mounted in the limiting sliding hole (323), and a lifting tooth (511) is provided at the lower part of the lifting shaft (51); the driving tooth (52) is provided at the tail of the connecting rod (43); the limiting push block (53) is slidably mounted on the centering clamp (33); the connecting spring (54) is connected between the limiting push block (53) and the centering clamp (33); the clamping assembly (55) is connected to the lifting shaft (51); and the lifting spring (56) is connected between the lifting shaft (51) and the lifting plate (22).

7. A multi-station pneumatic linkage sewing machine sleeve processing positioning and clamping device according to claim 6, characterized in that: The head of the centering clamping jaw (33) is provided with a pressure groove (421); the head of the limiting push block (53) is provided with a rubber push block (531); the rubber push block (531) is slidably installed in the pressure groove (421).

8. The multi-station pneumatic linkage sewing machine sleeve processing positioning and clamping device according to claim 7, characterized in that: The clamping assembly (55) comprises a limit groove (551), an ejection groove (552), a limit slider (553), a limit spring (554) and a pressure relief groove (555); the limit groove (551) is arranged at the tail of the limit push block (53); the ejection grooves (552) are arranged in a circular array at the upper part of the lifting shaft (51); the limit slider (553) is slidably mounted in the ejection groove (552), and a pressure relief clamping block (5531) is arranged at the tail of the limit slider (553); the limit spring (554) is connected between the limit slider (553) and the ejection groove (552); the pressure relief groove (555) is arranged at the top of the lifting shaft (51) and connects the plurality of ejection grooves (552).

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