A fixture for processing flexible wheel and its use method

Abstract

The present invention discloses a fixture for processing a flexible wheel and a method for using the fixture, which includes a clamping portion and a first-stage expansion assembly arranged on one side of the clamping portion. The clamping portion includes a clamping column and an oil storage cylinder concentrically arranged on one side. An oil supply piston is slidably arranged inside the oil storage cylinder. An electric push rod is fixedly installed on one side of the oil storage cylinder, and the electric push rod is arranged inside the clamping column. The oil supply piston is driven to slide by the electric push rod. The first-stage expansion assembly includes a tube body 1, an annular cavity 1 and an oil circuit 1. The tube body 1 is fixedly arranged on one side of the oil storage cylinder and is concentric with each other. The present invention improves the problems in the prior art where the inner hole of the flexible wheel is supported and fixed, resulting in difficulty in clamping and disassembly due to the interference fit between the core shaft and the inner hole of the flexible wheel. The present invention has the advantages of improving the efficiency of clamping by supporting and fixing the inner hole of the flexible wheel through the fixture when processing the outer circle of the flexible wheel.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible spline processing, and in particular to a fixture for processing a flexible spline and a method of using the fixture. Background Art

[0002] The harmonic reducer is mainly composed of four basic components: a wave generator, a flexspline, a flexible bearing, and a rigid gear. It relies on a wave generator equipped with a flexible bearing to make the flexible gear produce controllable elastic deformation, and mesh with the rigid gear to transmit motion and power. However, when processing the harmonic reducer, the thin wall of the flexspline makes the processing of the flexspline more difficult.

[0003] In the prior art, when rough and fine turning and gear hobbing are performed on the outer circle of the flexspline, the inner hole of the flexspline is generally supported by inserting a core shaft into the inner hole of the flexspline. When the inner hole is supported and fixed by the core shaft, the fit between the core shaft and the inner hole of the flexspline must be an interference fit, so that the core shaft can effectively support and fix the flexspline. However, due to the interference fit between the core shaft and the inner hole of the flexspline, a large external force is required to insert the core shaft into the inner hole of the flexspline, resulting in difficulties in clamping and disassembly. Therefore, a flexspline inner hole support fixture that is easy to clamp and disassemble is needed.

[0004] In response to the above technical problems, the present invention discloses a fixture for processing a flexible spline and a method of using the same. The present invention has the advantages of improving the clamping efficiency when processing the outer circle of the flexible spline and supporting and fixing the inner hole of the flexible spline through the device. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a tooling fixture for flexible wheel processing and a method of using the same, so as to solve the technical problems in the existing technology that when supporting and fixing the inner hole of the flexible wheel, the core shaft and the inner hole of the flexible wheel are interfered with, which makes clamping and disassembly difficult. The present invention has the advantages of supporting and fixing the inner hole of the flexible wheel by the fixture when processing the outer circle of the flexible wheel, thereby improving the efficiency of clamping.

[0006] The present invention is achieved through the following technical solutions: The present invention discloses a fixture for processing a flexible wheel, comprising a clamping portion and a first-stage expansion assembly arranged on one side of the clamping portion, the clamping portion comprising a clamping column and an oil storage cylinder arranged concentrically on one side, an oil supply piston slidably arranged inside the oil storage cylinder, an electric push rod fixedly mounted on one side of the oil storage cylinder, and the electric push rod is arranged inside the clamping column, and the oil supply piston is driven to slide by the electric push rod;

[0007] The first-stage expansion assembly includes a tube body, an annular cavity and an oil circuit. The tube body is fixedly arranged on one side of the oil storage cylinder and is concentric with each other. The tube body is a circular tube with one end closed and the other end open. The annular cavity is arranged inside the tube wall of the tube body, and the outer wall of the annular cavity is an elastic thin wall. A connecting hole is opened at the center of the closed end of the tube body, and one end opening of the connecting hole is connected to the oil storage cylinder. An oil circuit is opened inside the tube wall of the tube body, and the two end openings of the oil circuit are respectively connected to the annular cavity and the connecting hole.

[0008] Furthermore, a secondary expansion assembly and a tertiary expansion assembly are provided on one side of the oil storage cylinder, and the primary expansion assembly, the secondary expansion assembly and the tertiary expansion assembly are all concentrically arranged, and the primary expansion assembly, the secondary expansion assembly and the tertiary expansion assembly are sequentially sleeved along the axial direction. An oil supply pipe is provided at the center of the primary expansion assembly, the secondary expansion assembly and the tertiary expansion assembly, and the secondary expansion assembly and the tertiary expansion assembly are slidably sleeved on the outside of the oil supply pipe.

[0009] Furthermore, the oil supply pipe is located in the inner cavity of the tube body 1, and one end of the oil supply pipe is fixedly connected to the inner wall of the closed end of the inner cavity of the tube body 1 and is communicated with the communicating hole.

[0010] Furthermore, the secondary expansion assembly includes a piston block 1, a tube body 2, an annular cavity 2 and an oil circuit 2. The piston block 1 is arranged in the inner cavity of the tube body 1 and is slidingly sealed with the inner cavity of the tube body 1. The end face of the piston block 1 facing the opening of the tube body 1 is fixedly provided with the tube body 2, and the piston block 1 is slidably sleeved on the outer wall of the oil supply pipe and is slidingly sealed with the oil supply pipe. An annular cavity 2 is provided inside the tube wall of the tube body 2, and the outer wall of the annular cavity 2 is a thin wall. An oil circuit 2 for oil supply to the annular cavity 2 is provided inside the piston block 1. The outer wall of the oil supply pipe is provided with a first oil inlet hole, and the inner cavity of the tube body 1 is connected with the inner cavity of the oil supply pipe through the first oil inlet hole. The position of the first oil inlet hole is located between the closed end side wall of the inner cavity of the tube body 1 and the piston block 1. The outer wall of the oil supply pipe is also provided with a first oil circuit connecting hole, and after the tube body 2 extends out of the tube body 1, the oil circuit 2 overlaps and is connected with the first oil circuit connecting hole.

[0011] Furthermore, the three-stage expansion assembly includes a piston block two, a tube body three, an annular cavity three and an oil circuit three. The piston block two is arranged in the inner cavity of the tube body two and is slidingly sealed with the inner cavity of the tube body two. The tube body three is fixedly arranged on the side of the piston block two facing the opening of the tube body one, and the open end of the tube body three faces the closed end of the tube body one. The piston block two is sleeved on the outside of the oil supply pipe and is slidingly sealed with the oil supply pipe. An annular cavity three is opened inside the tube wall of the tube body three, a second oil inlet hole is opened on the outer wall of the oil supply pipe, and the position of the second oil inlet hole on the oil supply pipe is set on the side of the piston block two facing the oil storage cylinder. An oil circuit three for oil inlet of the annular cavity three is opened inside the piston block two, and a second oil circuit connecting hole is also opened on the outer wall of the oil supply pipe. After the tube body three is extended, the oil circuit three is connected with the second oil circuit connecting hole.

[0012] Furthermore, a control tube is slidingly provided inside the oil supply pipe, and the outer wall of the control tube is provided with a first tightening oil outlet hole connected to oil circuit one, a second tightening oil outlet hole connected to oil circuit two, and a third tightening oil outlet hole connected to oil circuit three. The outer wall of the control tube is also provided with a first oil outlet hole connected to the first oil inlet hole, and a second oil outlet hole connected to the second oil inlet hole. The first tightening oil outlet hole, the first oil outlet hole, the second oil outlet hole, the second tightening oil outlet hole and the third tightening oil outlet hole are arranged in sequence along the axial direction, and the spacing between the first oil outlet hole and the first oil inlet hole is the same as the spacing between the second tightening oil outlet hole and the first oil circuit connecting hole, and the spacing between the second oil outlet hole and the second oil inlet hole is the same as the spacing between the third tightening oil outlet hole and the second oil circuit connecting hole.

[0013] Furthermore, when the first tightening oil outlet is connected to oil circuit one, the first oil outlet, the second oil outlet, the second tightening oil outlet and the third tightening oil outlet are staggered and closed with the first oil inlet, the second oil inlet, the first oil circuit connecting hole and the second oil circuit connecting hole respectively; when the first oil outlet is connected to the first oil inlet, the second tightening oil outlet is connected to the first oil circuit connecting hole; the first tightening oil outlet, the second oil outlet and the third tightening oil outlet are staggered and closed with oil circuit one, the second oil inlet and the second oil circuit connecting hole respectively; when the second oil outlet is connected to the second oil inlet, the third tightening oil outlet is connected to the second oil circuit connecting hole; the first tightening oil outlet, the first oil outlet and the second tightening oil outlet will be staggered and closed with oil circuit one, the first oil inlet and the first oil circuit connecting hole respectively.

[0014] The cam is provided with a limit switch, and the limit switch is inserted in the oil supply piston of one end of the oil reservoir, and the limit switch is engaged with the sliding hole of the oil reservoir, and the limit switch is positioned by a limit assembly. The limit assembly includes a limit sleeve and a plug rod. The limit sleeve is fixedly arranged on one end face of the oil reservoir and is concentric with the sliding hole. A positioning plug hole is provided on the outer wall of the limit sleeve. A limiting hole 1, a limiting hole 2 and a limiting hole 3 are provided on the outer wall of the limiting sleeve. The plug rod is inserted in the positioning plug hole, and the plug rod is respectively engaged with the limiting hole 1, the limiting hole 2 and the limiting hole 3. The top of the plug rod is threadedly connected to the positioning plug hole. The positional relationship of the limiting hole 1, the limiting hole 2 and the limiting hole 3 corresponds to the limiting distance of the limiting post when the pipe body 2, the pipe body 3 and the pipe body 1 are switched. A pressure sensor is installed at the oil supply piston, and the pressure sensor is coaxially arranged with the limiting post.

[0015] Furthermore, one end of the limit column located inside the oil storage cylinder is connected to one end of the control tube through a connecting rod. When the limit hole 1 is connected to the positioning socket, the first oil inlet hole is connected to the first oil outlet hole, and the first oil circuit connecting hole is connected to the second tightening oil outlet hole. When the limit hole 2 is connected to the positioning socket, the second oil inlet hole is connected to the second oil outlet hole, and the second oil circuit connecting hole is connected to the third tightening oil outlet hole. When the limit hole 3 is connected to the positioning socket, the oil circuit 1 is connected to the first tightening oil outlet hole.

[0016] A method for using a fixture for processing a flexible wheel comprises the following steps:

[0017] Step 1: First, clamp the fixture on the machine tool chuck;

[0018] Step 2: Select and switch tube body 1, tube body 2 or tube body 3 according to the different specifications of the flexible pulley;

[0019] Step 3: After confirming the specifications of the flexible pulley, first unscrew the rod, then move the limit column so that the corresponding positioning hole is connected to the limit hole 1, limit hole 2 or limit hole 3 respectively. At the same time, the limit column will drive the control tube to move synchronously. When the limit column is adjusted, pass the rod through the positioning hole and insert it into the limit hole, thereby limiting the movement distance of the oil supply piston and controlling the oil inlet amount;

[0020] Step 4: Sleeve the flexible wheel on the outside of the tube body 1, tube body 2 or tube body 3 of the corresponding specifications, and make the flexible wheel sleeve on the thin wall, start the electric push rod, make the electric push rod extension shaft extend and push the oil supply piston, so that the hydraulic oil inside the oil reservoir is squeezed into the control tube, and when the oil supply piston moves, the oil supply piston contacts the limit column, and the limit column will limit the oil supply piston, so that the pressure sensor at the oil supply piston will be squeezed by the oil supply piston, and the electric push rod extension shaft will stop extending through the pressure sensor, and the hydraulic oil will enter the corresponding annular cavity to tighten the flexible wheel, completing the clamping;

[0021] Step 5: After the flexspline is clamped and fixed, start the machine tool and perform precision turning on the outer circle of the flexspline;

[0022] Step 6: After the processing is completed, retract the electric push rod extension shaft so that the extension shaft drives the oil supply piston back to one side of the oil reservoir. In this way, the oil supply piston will not form pressure on the hydraulic oil, so that the oil pressure is released. The staff can reset the pipe body 1, pipe body 2 and pipe body 3, and then remove the processed flexible wheel.

[0023] The present invention has the following advantages:

[0024] (1) The present invention provides a clamping part, an oil storage cylinder, an electric push rod, and a first-stage expansion assembly, so that when the flexible wheel needs to be clamped, the electric push rod can be started to push the oil supply piston to move, so that the hydraulic oil can be pushed into the oil circuit 1 of the tube body 1, so that the hydraulic oil enters the annular cavity 1, and thus the thin wall of the annular cavity 1 expands to tighten and fix the flexible wheel. When the flexible wheel is clamped, the annular cavity 1 of the tube body 1 does not expand, and the staff can easily insert the flexible wheel to the outside of the tube body, and then start the electric push rod to allow the hydraulic oil to enter the annular cavity 1 and tighten the flexible wheel to fix it. When disassembling, it is only necessary to extend the electric push rod shaft and retract it to drive the oil supply piston to reset, thereby relieving the pressure of the hydraulic oil, so that the thin wall of the annular cavity 1 can reset after losing the oil pressure, and the staff can easily remove the flexible wheel, making the clamping of the flexible wheel simple and easy.

[0025] (2) The present invention provides a first-stage expansion assembly, a second-stage expansion assembly, a third-stage expansion assembly, an oil supply pipe and a control pipe, so that when processing a flexible wheel, taking into account that the flexible wheel has various sizes and specifications, by providing multiple expansion assemblies, flexible wheels of various sizes and specifications can be clamped, and by providing the arrangement of the pipe body 1, the pipe body 2 and the pipe body 3 being connected in sequence and the oil supply pipe and the control pipe, when clamping flexible wheels of different specifications, it is only necessary to move the control pipe and then start the electric push rod to automatically complete the switching of the pipe body 1, the pipe body 2 and the pipe body 3, so that when clamping flexible wheels of different specifications, the operation is more convenient and easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic cross-sectional view of the present invention;

[0028] Figure 3 For the present invention Figure 2 A local enlarged structural diagram of point A;

[0029] Figure 4 For the present invention Figure 2 A schematic diagram of the partially enlarged structure at point B;

[0030] Figure 5 This is a schematic structural diagram of the tube body of the present invention in three extended states;

[0031] Figure 6 For the present invention Figure 5 Schematic diagram of the local enlarged structure at G;

[0032] Figure 7 For the present invention Figure 5 A schematic diagram of the partially enlarged structure at H;

[0033] Figure 8 For the present invention Figure 5 A schematic diagram of a local enlarged structure at location I;

[0034] Figure 9 This is a schematic structural diagram of the pipe body of the present invention in a working state;

[0035] Figure 10 For the present invention Figure 9 A schematic diagram of the local enlarged structure at D;

[0036] Figure 11 For the present invention Figure 9 Schematic diagram of the local enlarged structure at E;

[0037] Figure 12 For the present invention Figure 9 A schematic diagram of the partially enlarged structure at F;

[0038] Figure 13 For the present invention Figure 2 A schematic diagram of the partially enlarged structure at point C;

[0039] Figure 14 Schematic diagram of the limiting sleeve and limiting column structure of the present invention;

[0040] Figure 15 For the present invention Figure 2 Schematic diagram of the local enlarged structure at J.

[0041] In the figure: 1. Clamping part; 2. First-stage expansion assembly; 3. Oil supply piston; 4. Electric push rod; 5. Clearance hole; 6. Connecting hole; 7. Second-stage expansion assembly; 8. Third-stage expansion assembly; 9. Oil supply pipe; 10. First oil circuit connection hole; 11. First oil inlet hole; 12. Second oil inlet hole; 13. Second oil circuit connection hole; 14. Control pipe; 15. First tensioning oil outlet hole; 16. Second tensioning oil outlet hole; 17. Third tensioning oil outlet hole; 18. First oil outlet hole; 19. Second oil outlet hole; 20. Limiting ring; 21. Limiting column; 22. Sliding hole; 23. Limiting assembly; 24. Positioning plug Hole; 25, limit hole one; 26, limit hole two; 27, limit hole three; 28, pressure sensor; 29, connecting rod; 30, sensing column; 31, cover plate; 32, baffle; 33, spring; 34, mounting hole; 101, clamping column; 102, oil reservoir; 201, tube body one; 202, annular cavity one; 203, oil circuit one; 701, piston block one; 702, tube body two; 703, annular cavity two; 704, oil circuit two; 801, piston block two; 802, tube body three; 803, annular cavity three; 804, oil circuit three; 231, limit sleeve; 232, plug rod. DETAILED DESCRIPTION

[0042] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented based on the technical solution of the present invention, and a detailed implementation method and specific operation process are given. However, the scope of protection of the present invention is not limited to the following embodiment. In the description of the present invention, words indicating directions or positional relationships such as "front", "rear", "left", and "right" are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it should not be understood as a limitation on the present invention. Example

[0043] The embodiment discloses a fixture for processing a flexible wheel, such as Figures 1-15 As shown, it includes a clamping part 1 and a first-stage expansion assembly 2 arranged on one side of the clamping part 1, wherein the clamping part 1 is used to be clamped on the chuck of the machine tool, and the first-stage expansion assembly 2 is used to expand, support and fix the inner hole of the flexible wheel;

[0044] like Figure 1-Figure 2 As shown, the clamping part 1 includes a clamping column 101 and an oil storage cylinder 102. For the convenience of description, the direction of the clamping column 101 is the left side. Specifically, the clamping column 101, the oil storage cylinder 102 and the first-level expansion assembly 2 are connected in sequence from left to right. The clamping column 101, the oil storage cylinder 102 and the first-level expansion assembly 2 are all cylindrical, and the clamping column 101, the oil storage cylinder 102 and the first-level expansion assembly 2 are all concentrically arranged. The clamping column 101 is used to be clamped on the chuck of the machine tool, and the oil storage cylinder 102 is used to supply oil to the first-level expansion assembly 2, so that the expansion part of the first-level expansion assembly 2 expands to support and fix the inner hole of the flexible wheel;

[0045] More specifically, Figure 2 As shown, an oil supply piston 3 is slidably provided inside the oil storage cylinder 102. In addition, an electric push rod 4 is fixedly installed on one side of the oil storage cylinder 102, and the electric push rod 4 is arranged inside the clamping column 101. One end of the extension shaft of the electric push rod 4 extends into the interior of the oil storage cylinder 102, and the extension shaft of the electric push rod 4 is located at one end of the oil storage cylinder 102 and connected to the oil supply piston 3, so that when it is necessary to supply oil to the first-stage expansion assembly 2, the electric push rod 4 can be started to push the oil supply piston 3 to move. The hydraulic oil in the oil reservoir 102 flows toward the first-stage expansion assembly 2 for oil supply. In addition, it should be noted that a clearance hole 5 is provided at the center of one end of the clamping column 101, and the wire of the electric push rod 4 is discharged through the clearance hole 5. The wire of the electric push rod 4 can be connected through an electric slip ring, so that when the fixture is clamped on the chuck, the wire can extend through the spindle hole of the lathe to connect to the power supply, and the provision of the electric slip ring can prevent the wire from being entangled when the clamping column 101 rotates.

[0046] Specifically, such as Figure 2-Figure 12As shown, the first-stage expansion assembly 2 includes a tube body 201, an annular cavity 202 and an oil circuit 203, wherein the tube body 201 is fixedly arranged on one side of the oil storage cylinder 102, and the tube body 201 is specifically a circular tube body with one end closed and the other end open. The tube body 201 is concentrically arranged with the oil storage cylinder 102 and the clamping column 101, and the annular cavity 202 is arranged inside the tube wall of the tube body 201, and the outer wall of the annular cavity 202 is an elastic thin wall, so that oil can be supplied to the inside of the annular cavity 202, and the thin wall of the annular cavity 202 is uniformly expanded outward by oil pressure, so that the flexible wheel is tightened inside to fix it. In addition, a connecting hole 6 is opened at the center of the closed end of the tube body 201, and one end of the connecting hole 6 is opened. The opening is connected to the interior of the oil reservoir 102, and an oil passage 203 is opened inside the tube wall of the tube body 201, and the openings at both ends of the oil passage 203 are respectively connected to the annular cavity 202 and the connecting hole 6, so that when oil is added to the oil reservoir 102, the hydraulic oil can enter the oil passage 203 through the connecting hole 6, and then enter the interior of the annular cavity 202, thereby pressurizing the annular cavity 202, so that the thin wall of the annular cavity 202 is tightened to support and fix the inner hole of the flexible wheel. In addition, it should be noted that the inner wall thickness of the annular cavity 202 adjacent to the inner cavity of the tube body 201 is set to be thicker to avoid deformation of the inner wall adjacent to the inner cavity of the annular cavity 202 and the inner cavity of the tube body 201 when the annular cavity 202 is pressurized;

[0047] Therefore, when clamping the flexible wheel, the clamping part 1 is first clamped and tightened by the chuck of the machine tool, and then the flexible wheel is sleeved on the outside of the tube body 201, and the flexible wheel is sleeved on the outside of the thin wall of the annular cavity 202. Then, the inside of the connecting hole 6 is pressurized, so that the hydraulic oil enters the annular cavity 202 through the connecting hole 6 and the oil channel 203, and the thin wall of the annular cavity 202 is uniformly tightened by the oil pressure, thereby fixing the flexible wheel. Therefore, the inner hole can be tightened by the deformation of the thin wall. Since the thin wall is evenly subjected to the oil pressure at this time, the clamping accuracy of the flexible wheel inner hole after tightening can be improved.

[0048] When processing the flexible wheel, considering that the flexible wheel has various sizes and specifications, when processing and clamping the flexible wheel, it is tightened and fixed by the expansion component. Due to the small expansion amplitude of the expansion component, the size span applicable to the expansion component is small. Therefore, when processing flexible wheels of different sizes, it is necessary to prepare expansion fixtures of multiple specifications. When processing different flexible wheels, the fixture needs to be removed from the machine tool chuck and replaced with the corresponding fixture. Therefore, when processing flexible wheels of different sizes, it is more troublesome to replace the fixture, which affects the work efficiency. Therefore, if Figure 2As shown, in addition to the first-stage expansion assembly 2, a second-stage expansion assembly 7 and a third-stage expansion assembly 8 are also provided on one side of the oil reservoir 102. In other words, at least two expansion assemblies are provided on one side of the oil reservoir 102. In this embodiment, three expansion assemblies are provided on one side of the oil reservoir 102. For the convenience of description, the other two expansion assemblies are named the second-stage expansion assembly 7 and the third-stage expansion assembly 8, respectively. The first-stage expansion assembly 2, the second-stage expansion assembly 7 and the third-stage expansion assembly 8 are all concentrically arranged, and the first-stage expansion assembly 2, the second-stage expansion assembly 7 and the third-stage expansion assembly 8 are all concentrically arranged. The expansion components 8 are sequentially sleeved along the axial direction from left to right, and an oil supply pipe 9 is provided at the center of the first-stage expansion component 2, the second-stage expansion component 7, and the third-stage expansion component 8. The second-stage expansion component 7 and the third-stage expansion component 8 are slidably sleeved on the outside of the oil supply pipe 9. Specifically, the oil supply pipe 9 is located in the inner cavity of the tube body 201, and one end of the oil supply pipe 9 is fixedly connected to the inner wall of the closed end of the inner cavity of the tube body 201. In addition, the interior of the oil supply pipe 9 is connected to the connecting hole 6, and oil is supplied to the first-stage expansion component 2, the second-stage expansion component 7, and the third-stage expansion component 8 respectively through the oil supply pipe 9;

[0049] Specifically, such as Figure 2 、 Figure 3 and Figure 4As shown, the secondary expansion assembly 7 includes a piston block 1 701, a tube body 2 702, an annular cavity 2 703 and an oil circuit 2 704, wherein the piston block 1 701 is located in the inner cavity of the tube body 1 201, and the outer circumferential outer wall of the piston block 1 701 is slidingly sealed with the inner cavity of the tube body 1 201, and the end of the piston block 1 701 with an opening facing the tube body 1 201 is fixedly provided with the tube body 2 702, and the piston block 1 701 is slidably sleeved on the outer wall of the oil supply pipe 9, and the inner hole of the piston block 1 701 is slidingly sealed with the oil supply pipe 9, so that the piston block 1 701 drives the tube body 2 702 to slide horizontally outside the oil supply pipe 9, and the tube wall of the tube body 2 702 is provided with an annular cavity 2 703, and the outer wall of the annular cavity 2 703 The outer wall of the oil supply pipe 9 is provided with a first oil circuit connecting hole 10. When the oil circuit 704 moves to the first oil circuit connecting hole 10, the oil circuit 704 is connected with the interior of the oil supply pipe 9 through the first oil circuit connecting hole 10, so that the interior of the annular cavity 2 703 is connected with the interior of the oil supply pipe 9 through the oil circuit 704 and the first oil circuit connecting hole 10. Therefore, the hydraulic oil in the oil storage cylinder 102 can enter the interior of the annular cavity 2 703 through the oil supply pipe 9 and the oil circuit 704, so that the thin wall of the annular cavity 2 703 can be tightened to fix the flexible wheel. In addition, the outer wall of the oil supply pipe 9 is provided with a second oil circuit connecting hole 10. An oil inlet hole 11 is formed, and the interior of the inner cavity of the tube body 201 is connected to the interior of the oil supply pipe 9 through the first oil inlet hole 11. In addition, the position of the first oil inlet hole 11 is located between the closed end of the inner cavity of the tube body 201 and the piston block 101, so that when oil is fed into the oil supply pipe 9, the hydraulic oil can enter the inner cavity of the tube body 201 through the first oil inlet hole 11, and the hydraulic oil is on the side of the piston block 101 facing the oil storage cylinder 102, so that the oil pressure of the hydraulic oil can move the piston block 101 toward the open end of the tube body 201, thereby extending the tube body 202, and clamping the flexible wheel of the appropriate size through the tube body 202, so that when processing and clamping flexible wheels of other specifications, there is no need to disassemble the fixture, and only the oil pressure is needed to move the tube body 201 to the open end of the tube body 201. 02 can be extended to complete the replacement. In addition, it should be noted that, in order to prevent the thin wall of the second annular cavity 703 from expanding after the second tube body 702 has not yet extended from the inside of the first tube body 201, thereby preventing the second tube body 702 from extending, the position of the first oil circuit connecting hole 10 is configured so that after the second tube body 702 extends from the inside of the first tube body 201, the second oil circuit 704 and the first oil circuit connecting hole 10 overlap and communicate with each other, so that after the second tube body 702 extends from the inside of the first tube body 201, the second oil circuit 704 and the first oil circuit connecting hole 10 are communicated, and the hydraulic oil begins to enter the second annular cavity 703 through the second oil circuit 704, tightening the thin wall of the second annular cavity 703, thereby preventing the thin wall of the second annular cavity 703 from expanding too early and affecting the extension of the second tube body 702;

[0050] like Figure 2-Figure 4 As shown, the three-stage expansion assembly 8 specifically includes a piston block 2 801, a tube body 3 802, an annular cavity 3 803 and an oil passage 3 804, wherein the piston block 2 801 is arranged in the inner cavity of the tube body 2 702, and the outer circumferential wall of the piston block 2 801 and the inner cavity of the tube body 2 702 are in sliding sealing cooperation. Specifically, a sealing ring is provided on the outer circumferential wall of the piston block 2 801, and the tube body 3 802 is fixedly arranged on the side of the piston block 2 801 facing the opening of the tube body 1 201, and the open end of the tube body 3 802 faces the closed end of the tube body 1 201. The body 3 802 is sleeved on the outside of the oil supply pipe 9. In addition, the piston block 2 801 is slidably sleeved on the outside of the oil supply pipe 9, and the inner hole of the piston block 2 801 is in sliding sealing cooperation with the outer wall of the oil supply pipe 9. An annular cavity 3 803 is opened inside the wall of the tube body 3 802. The outer wall of the annular cavity 3 803 is thin-walled, which is the same as the annular cavity 2 703. In addition, a second oil inlet hole 12 is opened on the outer wall of the oil supply pipe 9. The position of the second oil inlet hole 12 on the oil supply pipe 9 is set on the side of the piston block 2 801 facing the oil storage cylinder 102. Specifically, as shown in FIG. Figures 9-12 As shown, under normal conditions, that is, when the second tube body 702 and the third tube body 802 are not extended, the second oil inlet hole 12 is located in the inner cavity of the second tube body 702 and between the second piston block 801 and the first piston block 701, so that when the third tube body 802 needs to be extended, oil is introduced through the second oil inlet hole 12 so that the oil pressure can enter the inner cavity of the second tube body 702 and is located between the first piston block 701 and the second piston block 801, so that the second piston block 801 is pushed by the oil pressure, causing the third tube body 802 to extend. In addition, the tube wall of the third tube body 802 and the interior of the second piston block 801 are provided with an oil passage 3 804, and the annular cavity 3 803 is connected to the inner cavity of the third tube body 802 through the oil passage 3 804. Correspondingly, the outer wall of the oil supply pipe 9 is also provided with a second oil passage connecting hole 13. It should be noted that the position of the second oil passage connecting hole 13 on the oil supply pipe 9 is set as Figure 5-Figure 8 As shown, when the third tube body 802 is fully extended, the third oil circuit 804 is connected to the second oil circuit connection hole 13, so that after the third tube body 802 is extended, the second oil circuit connection hole 13 is tightened under the control of oil pressure. Moreover, through the above arrangement, when it is necessary to switch the third tube body 802, the third tube body 802 can be extended alone, thereby avoiding the situation where both the second tube body 702 and the third tube body 802 are extended too long, causing the extension to be too long and affecting the stability of the fixture rotation.

[0051] In use, in order to more conveniently switch the extension of the second tube body 702 and the third tube body 802, and also to facilitate the switching of the annular cavity 1 202, the annular cavity 2 703 and the annular cavity 3 803, as shown in FIG. Figure 2-Figure 4As shown, a control tube 14 is slidingly provided inside the oil supply pipe 9, and the outer wall of the control tube 14 is provided with a first tightening oil outlet hole 15 for supplying oil to the oil circuit 1 203, a second tightening oil outlet hole 16 for supplying oil to the oil circuit 2 704, and a third tightening oil outlet hole 17 for supplying oil to the oil circuit 3 804. In addition, a first oil outlet hole 18 connected to the first oil inlet hole 11 and a second oil outlet hole 19 connected to the second oil inlet hole 12 are provided. The first tightening oil outlet hole 15, the first oil outlet hole 18, the second oil outlet hole 19, the second tightening oil outlet hole 16 and the third tightening oil outlet hole 17 are arranged in sequence from left to right along the axial direction of the oil supply pipe 9, and the distance between the first oil outlet hole 18 and the first oil inlet hole 11 is the same as the distance between the second tightening oil outlet hole 16 and the first oil circuit connecting hole 10. The same, in addition, the spacing between the second oil outlet hole 19 and the second oil inlet hole 12 is the same as the spacing between the third tightening oil outlet hole 17 and the second oil circuit connecting hole 13, and it should be noted that, since the control tube 14 can slide inside the oil supply pipe 9, the control tube 14 can be slid inside the oil supply pipe 9 to achieve the control of the connection position between the control tube 14 and each hole on the oil supply pipe 9, thereby controlling the oil inlet route of the oil circuit, and then controlling the extension of the switching tube body 2 702 and the tube body 3 802 and the switching of the annular cavity 1 202, the annular cavity 2 703 and the annular cavity 3 803, and the positional relationship of the first tightening oil outlet hole 15, the first oil outlet hole 18, the second oil outlet hole 19, the second tightening oil outlet hole 16 and the third tightening oil outlet hole 17 is specifically set as follows: Figures 9-12 As shown, when the first expansion oil outlet hole 15 is connected to the oil circuit 1 203, the first oil outlet hole 18, the second oil outlet hole 19, the second expansion oil outlet hole 16, and the third expansion oil outlet hole 17 are staggered with the first oil inlet hole 11, the second oil inlet hole 12, the first oil circuit connecting hole 10, and the second oil circuit connecting hole 13, respectively. The first oil outlet hole 18, the second oil outlet hole 19, the second expansion oil outlet hole 16, and the third expansion oil outlet hole 17 are blocked by the inner wall of the oil supply pipe 9, so that the hydraulic oil can only enter the annular cavity 1 202 through the first expansion oil outlet hole 15 and the oil circuit 1 203, and the flexible pulley of the corresponding size is tightened and fixed through the tube body 1 201.

[0052] The same, such as Figure 2-Figure 4As shown, when the control tube 14 moves so that the first oil outlet hole 18 is connected to the first oil inlet hole 11, the second expansion oil outlet hole 16 is connected to the first oil circuit connection hole 10, and the first expansion oil outlet hole 15, the second oil outlet hole 19 and the third expansion oil outlet hole 17 are staggered with the oil circuit 1 203, the second oil inlet hole 12 and the second oil circuit connection hole 13 respectively, so that when the second tube body 702 needs to be extended, the control tube 14 is moved so that the first oil outlet hole 18 is connected to the first oil circuit connection hole 10. The oil inlet hole 11 is connected, and at the same time, the first oil circuit connecting hole 10 is connected to the second tightening oil outlet hole 16, so that the hydraulic oil can only enter the inner cavity of the tube body 1 201 through the first oil outlet hole 18 and the first oil inlet hole 11, so that the tube body 2 702 is pushed out. After that, after the oil circuit 2 704 is connected to the first oil circuit connecting hole 10, the hydraulic oil will enter the interior of the first oil circuit connecting hole 10 through the second tightening oil outlet hole 16, thereby supplying oil to the annular cavity 2 703 for tightening;

[0053] Same as the above description, such as Figure 5-Figure 8 As shown, when the second oil outlet hole 19 is connected to the second oil inlet hole 12, the third expansion oil outlet hole 17 is connected to the second oil circuit connecting hole 13, and the first expansion oil outlet hole 15, the first oil outlet hole 18, and the second expansion oil outlet hole 16 are staggered with the oil circuit 1 203, the first oil inlet hole 11, and the first oil circuit connecting hole 10, respectively, so that the hydraulic oil is supplied to push the tube body 3 802 out and the annular cavity 3 803 is tightened;

[0054] In the above description, it should be noted that, when the second tube body 702 is extended, since the third tube body 802 is inside the second tube body 702, when the second tube body 702 is extended, the third tube body 802 will move outward along with the second tube body 702 outside the oil supply pipe 9. At this time, when the second tube body 702 needs to be extended, the second tightening oil outlet hole 16 and the first oil circuit connecting hole 10 are in a connected state. When the third tube body 802 moves outside the oil supply pipe 9 along with the movement of the second tube body 702, there will be a third tube body 802. 2 is connected to the first oil circuit connection hole 10 in advance, so that hydraulic oil may enter the interior of the oil circuit 3 804. Therefore, the oil circuit 3 804 and the oil circuit 2 704 are staggered on the circumference, and the first oil circuit connection hole 10 and the second oil circuit connection hole 13 are also staggered on the circumference. When the second tube body 702 is extended, the third tube body 802 moves with the second tube body 702, and the oil circuit 3 804 on the third tube body 802 will not be connected to the first oil circuit connection hole 10.

[0055] More specifically, the pipe body 1 201, the pipe body 2 702 and the pipe body 3 802 are respectively formed by two concentric circular cylinders connected together, wherein the cylinder with a larger inner diameter is connected to the outside of the other cylinder, and the inner wall of the outer cylinder is tightly fitted with the outer wall of the inner cylinder. The outer wall of the outer cylinder, that is, the position of the annular cavity, is set to be thin-walled, and the outer wall of the inner cylinder, that is, the position of the annular cavity, is provided with an annular groove, thereby forming an annular cavity, so that when the annular cavity is filled with hydraulic oil, the oil pressure can be used to make the annular cavity The thin wall of the annular cavity expands to tighten and fix the inner hole of the flexible wheel. In addition, a limit ring 20 is provided at one end of the tube body 201 and the tube body 2 702. The limit ring 20 limits the position of the piston block 1 701 and the piston block 2 801 respectively to prevent the piston block 1 701 and the piston block 2 801 from moving out. It should be noted that the outer walls of the piston block 1 701 and the piston block 2 801 are both provided with a sealing ring, so that the piston block 1 701 and the piston block 2 801 can be moved by oil pressure.

[0056] When actually using this fixture, if Figure 2 As shown, since the inner diameter of the tube body 1 201 is larger than the inner diameter of the tube body 2 702, and the capacities of the annular cavity 1 202, the annular cavity 2 703 and the annular cavity 3 803 are all different, when the flexible wheel is tightened through the tube body 1 201, the tube body 2 702 and the tube body 3 802 respectively, the required amount of hydraulic oil will also be different. Correspondingly, when the hydraulic oil is pushed into the oil supply pipe 9 through the oil supply piston 3, the moving distance of the oil supply piston 3 will also be different as the different tube bodies are switched. For example, when the flexible wheel is clamped through the tube body 1 201, since the tube body 1 201 only needs to tighten the annular cavity 1 202 through the hydraulic oil, the required amount of oil is less when the flexible wheel is tightened through the tube body 1 201, while more hydraulic oil is required when the flexible wheel is tightened through the tube body 2 702. The pressurized oil fills the inner cavity of the tube body 1 201, thereby extending the tube body 2 702, and then filling the annular cavity 2 703, so that a large amount of oil is required. When tightening the flexible wheel through the tube body 3 802, the hydraulic oil needs to fill the inner cavity of the tube body 2 702, and then fill the annular cavity 3 803. Since the inner cavity of the tube body 2 702 is smaller than the inner cavity of the tube body 1 201, and the capacity of the annular cavity 3 803 is smaller than the annular cavity 2 703, the amount of oil required for switching the flexible wheel of each tube body tensioner can be configured to be in a decreasing shape of the tube body 2 702, the tube body 3 802 and the tube body 1 201. Therefore, the required amount of oil is different, and the distance moved by the oil supply piston 3 will be different, so the moving distance of the oil supply piston 3 also needs to be positioned, and in order to make the limit of the oil supply piston 3 more stable, such as Figure 13 and Figure 14As shown, a limit post 21 is provided inside the oil storage cylinder 102, and the limit post 21 is provided on the side of the oil supply piston 3 facing the tube body 201. The limit post 21 limits the movement distance of the oil supply piston 3, making the mechanical limit of the limit post 21 more stable. In addition, the length of the limit post 21 inside the oil storage cylinder 102 is set to be adjustable, so that when switching different tube bodies, the length of the limit post 21 can be adjusted to achieve the purpose of controlling the movement distance of the oil supply piston 3.

[0057] Specifically, such as Figure 9 、 Figure 13 and Figure 14 As shown, a sliding hole 22 is opened inside the outer wall of the oil storage cylinder 102 on the side facing the tube body 201, and the limiting post 21 is slidably inserted into the inside of the sliding hole 22, and the limiting post 21 and the sliding hole 22 are slidingly sealed, and the two ends of the limiting post 21 are respectively located inside and outside the oil storage cylinder 102, so that the length of the limiting post 21 inside the oil storage cylinder 102 can be controlled by sliding the limiting post 21 inside the sliding hole 22. Therefore, the limiting length of the limiting post 21 is adjusted to achieve the purpose of controlling the moving distance of the oil supply piston 3. In addition, the limiting post 21 is limited by the limiting component 23, so that the position can be fixed after the limiting column 21 is adjusted. Specifically, the limiting component 23 includes a limiting sleeve 231 and an insertion rod 232, wherein the limiting sleeve 231 is arranged on the end face of the side of the oil storage cylinder 102 facing the tube body 201, and the limiting sleeve 231 and the insertion rod 232 are The sliding hole 22 is concentric, and the limiting post 21 also slides with the inner wall of the limiting sleeve 231. In addition, the outer wall of the limiting sleeve 231 is provided with a positioning hole 24. Similarly, the outer wall of the limiting post 21 is provided with a limiting hole, and three limiting holes are provided. The three limiting holes are arranged in sequence along the axial direction of the limiting post 21, and an insert rod 232 is inserted at the positioning hole 24, and the insert rod 232 is plugged into the limiting hole. In addition, the top of the insert rod 232 is threadedly connected with the positioning hole 24, so that after the limiting post 21 is moved and the position of the limiting post 21 is determined, the insert rod 232 is inserted into the limiting hole through the positioning hole 24. When the insert rod 232 is inserted into the limiting hole, the insert rod 232 is rotated and threadedly connected with the positioning hole 24, thereby preventing the insert rod 232 from falling off. After the insert rod 232 is inserted into the limiting hole, the position of the limiting post 21 can be limited.

[0058] For the convenience of description, the three limiting holes are named as limiting hole 1 25, limiting hole 26, and limiting hole 3 27 in order from left to right along the axial direction of the limiting column 21. The positional relationship of the three limiting holes is configured as follows: when the tube body 1 201 is switched to tighten the flexible pulley, the limiting column 21 is slid so that the positioning socket 24 overlaps and communicates with the limiting hole 3 27, so that the length of the limiting column 21 inside the oil storage cylinder 102 is longer. Therefore, the longer limiting column 21 inside the oil storage cylinder 102 shortens the moving distance of the oil supply piston 3, thereby reducing the amount of oil entering the oil supply pipe 9. When the tube body 1 201 is switched to tighten the flexible pulley, the limiting column 21 is slid so that the positioning socket 24 overlaps and communicates with the limiting hole 3 27, so that the length of the limiting column 21 inside the oil storage cylinder 102 is longer. Therefore, the longer limiting column 21 inside the oil storage cylinder 102 shortens the moving distance of the oil supply piston 3, thereby reducing the amount of oil entering the oil supply pipe 9. When the second tube body 702 is switched, the limiting post 21 is moved to the positioning socket 24 and connected to the limiting hole 1 25, thereby shortening the length of the limiting post 21 inside the oil storage cylinder 102, thereby increasing the moving range of the oil supply piston 3 and the moving distance of the oil supply piston 3. When the third tube body 802 is switched, the limiting post 21 is moved to the positioning socket 24 and connected to the limiting hole 2 26, so that the positional relationship of the limiting hole 1 25, the limiting hole 26 and the limiting hole 3 27 respectively corresponds to the limiting distance of the limiting post 21 when the second tube body 702, the third tube body 802 and the first tube body 201 are switched;

[0059] When the oil supply piston 3 is limited by the limiting column 21, in order to make the oil supply piston 3 reach the specified position, the electric push rod 4 can stop extending, such as Figure 15 As shown, a pressure sensor 28 is installed at the oil supply piston 3, and the pressure sensor 28 is coaxially arranged with the limit column 21, and the pressure sensor 28 is electrically connected to the electric push rod 4, so that when the oil supply piston 3 contacts the limit column 21, the limit column 21 blocks the oil supply piston 3, so that the pressure sensor 28 is subjected to pressure, thereby transmitting a signal to the electric push rod 4 through the pressure sensor 28, so that the electric push rod 4 stops extending. Specifically, a mounting hole 34 is opened inside the oil supply piston 3, and the pressure sensor 28 is arranged inside the mounting hole 34, and the center of the mounting hole 34 is on the same horizontal axis as the center of the limit column 21, and the cover plates 31 are detachably connected on both sides of the mounting hole 34, and the pressure sensor 28 is fixedly connected to the cover plate 31 facing the direction of the electric push rod 4. The induction column 30 is slidably connected to the center of the other cover plate 31, and the induction column 30 and the cover plate 31 are in sliding sealing cooperation to prevent the hydraulic oil from entering the mounting hole 34. In addition, the two ends of the induction column 30 extend to the inside of the mounting hole 34 and the inside of the oil storage cylinder 102 respectively, and the two ends of the induction column 30 are respectively provided with baffles 32 for limiting. The end of the induction column 30 located outside the mounting hole 34 is also sleeved with a spring 33, so that when the oil supply piston 3 moves to contact the limit column 21, the induction column 30 on the oil supply piston 3 will contact the limit column 21 and be blocked by the limit column 21, so that the induction column 30 moves toward the pressure sensor 28, so that the induction column 30 contacts the pressure sensor 28, so that the pressure sensor 28 is pressurized to control the electric push rod 4;

[0060] In addition, in order to make the operation more convenient when switching the tube body, Figure 2 、 Figure 3 and Figure 13 As shown, one end of the limit column 21 located inside the oil storage cylinder 102 is connected to one end of the control tube 14 through a connecting rod 29, so that when the tube body is switched, the limit column 21 is adjusted while the control tube 14 is moved, so that the holes on the control tube 14 are connected to the holes on the oil supply pipe 9 respectively, and the position relationship between the holes on the oil supply pipe 9 and the limit holes on the limit column 21 is specifically configured as follows: when the limit hole 25 is connected to the positioning socket 24, the first oil inlet hole 11 and the first oil outlet hole are connected. 18 is connected, and the first oil circuit connecting hole 10 is connected with the second tightening oil outlet hole 16, and when the limiting hole 26 is connected with the positioning socket 24, the second oil inlet hole 12 is connected with the second oil outlet hole 19, and the second oil circuit connecting hole 13 is connected with the third tightening oil outlet hole 17, and when the limiting hole 3 27 is connected with the positioning socket 24, the oil circuit 1 203 is connected with the first tightening oil outlet hole 15, so that the movement of the limiting column 21 and the movement of the control tube 14 can be carried out synchronously, thereby improving the convenience of tube body switching.

[0061] A method for using a fixture for processing a flexible wheel comprises the following steps:

[0062] Step 1: First, clamp the fixture on the machine tool chuck, and make the wire of the electric push rod 4 be able to be discharged through the spindle hole of the machine tool;

[0063] Step 2: Select and switch tube body 1 201, tube body 2 702 or tube body 3 802 according to the different specifications of the flexible pulley;

[0064] Step 3: After confirming the specifications of the flexible pulley, first unscrew the rod 232, then move the limit column 21 so that the corresponding positioning hole 24 is connected to the limit hole 1 25, the limit hole 26, or the limit hole 3 27. At the same time, the limit column 21 will drive the control tube 14 to move synchronously. When the limit column 21 is adjusted, the rod 232 is passed through the positioning hole 24 and inserted into the limit hole, thereby adjusting the movement distance of the oil supply piston 3 and controlling the oil supply amount.

[0065] Step 4: The flexible wheel is sleeved on the outside of the tube body 1 201, the tube body 2 702 or the tube body 3 802 of the corresponding specifications, and the flexible wheel is sleeved on the thin wall, and the electric push rod 4 is started to extend the shaft of the electric push rod 4 and push the oil supply piston 3, thereby squeezing the hydraulic oil inside the oil storage cylinder 102 into the inside of the control tube 14. When the oil supply piston 3 moves, the oil supply piston 3 contacts the limit column 21, and the limit column 21 will limit and block the oil supply piston 3, so that the pressure sensor 28 will be squeezed by the limit column 21, and the extension shaft of the electric push rod 4 stops extending through the pressure sensor 28, completing the clamping. When it is necessary to clamp the flexible wheel through the tube body 1 201, the limit column 21 is moved to the limit hole 3 27 and the limit hole 3. The positioning socket 24 is connected, and the control pipe 14 will also move with the limiting column 21. When the limiting hole 3 27 is connected to the positioning socket 24, the first tightening oil outlet hole 15 on the control pipe 14 will be connected to the oil circuit 1 203, and the hydraulic oil will enter the annular cavity 1 202 through the first tightening oil outlet hole 15 and the oil circuit 1 203, so that the thin wall of the annular cavity 1 202 expands to tighten and fix the flexible wheel. When the flexible wheel needs to be clamped through the pipe body 2 702, the limiting column 21 is moved to the limiting hole 1 25 to be connected to the positioning socket 24, and the control pipe 14 will synchronously move to the first oil outlet hole 18 to be connected to the first oil inlet hole 11, and the second tightening oil outlet hole 16 will be connected to the first oil circuit connecting hole 10, so that the hydraulic oil The pressurized oil can enter the inner cavity of the tube body 1 201 through the first oil outlet hole 18 and the first oil inlet hole 11, and the tube body 2 702 is pushed by the hydraulic oil, so that the tube body 2 702 extends. In addition, when the tube body 2 702 is extended and the tube body 2 702 is in place, the oil passage 2 704 on the tube body 2 702 will be connected with the first oil passage connection hole 10, so that the hydraulic oil will enter the annular cavity 2 703 through the second tightening oil outlet hole 16, the first oil passage connection hole 10 and the oil passage 2 704, so that the flexible wheel is fixed by the thin wall tightening of the tube body 2 702. When the flexible wheel needs to be clamped through the tube body 3 802, the limit column 21 is moved so that the limit hole 26 is connected with the positioning socket 24, and the corresponding , the control tube 14 will move synchronously, and the second oil outlet hole 19 will be connected to the second oil inlet hole 12, and the third tightening oil outlet hole 17 will be connected to the second oil circuit connection hole 13, and the hydraulic oil can enter the inner cavity of the second tube body 702 through the second oil outlet hole 19 and the second oil inlet hole 12, and the tube body 3 802 will be pushed by the hydraulic oil, thereby causing the tube body 3 802 to extend. In addition, when the tube body 3 802 is extended into place, the oil circuit 3 804 on the tube body 3 802 will be connected to the second oil circuit connection hole 13, so that the hydraulic oil will enter the interior of the annular cavity 3 803 through the third tightening oil outlet hole 17, the second oil circuit connection hole 13 and the oil circuit 3 804, thereby fixing the flexible wheel through the thin wall tightening of the tube body 3 802;

[0066] Step 5: After the flexspline is clamped and fixed, start the machine tool and perform precision turning on the outer circle of the flexspline;

[0067] Step 6: After the processing is completed, the electric push rod 4 is extended and the shaft is retracted, so that the extended shaft drives the oil supply piston 3 to return to one side of the oil storage cylinder 102. In this way, the oil supply piston 3 will not form pressure on the hydraulic oil, so that the oil pressure is released. The staff can reset the pipe body 1 201, the pipe body 2 702 and the pipe body 3 802, and then remove the processed flexible pulley.

[0068] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A fixture for processing a flexible wheel, comprising a clamping portion (1) and a first-stage expansion assembly (2) arranged on one side of the clamping portion (1), characterized in that: The clamping portion (1) includes a clamping column (101) and an oil storage cylinder (102) concentrically arranged on one side, an oil supply piston (3) is slidably arranged inside the oil storage cylinder (102), an electric push rod (4) is fixedly installed on one side of the oil storage cylinder (102), and the electric push rod (4) is arranged inside the clamping column (101), and the oil supply piston (3) is driven to slide by the electric push rod (4); The first-stage expansion assembly (2) comprises a tube body (201), an annular cavity (202) and an oil circuit (203), wherein the tube body (201) is fixedly arranged on one side of the oil storage cylinder (102) and is concentric with each other, and the tube body (201) is a circular tube body with one end closed and the other end open, the annular cavity (202) is arranged inside the tube wall of the tube body (201), and the outer wall of the annular cavity (202) is an elastic thin wall, a connecting hole (6) is opened at the center of the closed end of the tube body (201), one end opening of the connecting hole (6) is connected to the oil storage cylinder (102), an oil circuit (203) is opened inside the tube wall of the tube body (201), and the two end openings of the oil circuit (203) are respectively connected to the annular cavity and the connecting hole (6); A secondary expansion assembly (7) and a tertiary expansion assembly (8) are further provided on one side of the oil storage cylinder (102), and the primary expansion assembly (2), the secondary expansion assembly (7) and the tertiary expansion assembly (8) are all concentrically arranged, and the primary expansion assembly (2), the secondary expansion assembly (7) and the tertiary expansion assembly (8) are sequentially sleeved in the axial direction, and an oil supply pipe (9) is provided at the center of the primary expansion assembly (2), the secondary expansion assembly (7) and the tertiary expansion assembly (8), and the secondary expansion assembly (7) and the tertiary expansion assembly (8) are slidably sleeved on the outside of the oil supply pipe (9); The oil supply pipe (9) is located in the inner cavity of the tube body (201), and one end of the oil supply pipe (9) is fixedly connected to the inner wall of the closed end of the inner cavity of the tube body (201) and is connected to the communication hole (6); The secondary expansion assembly (7) includes a piston block (701), a tube body (702), an annular cavity (703) and an oil circuit (704). The piston block (701) is arranged in the inner cavity of the tube body (201) and is slidably sealed with the inner cavity of the tube body (201). The end face of the piston block (701) facing the opening of the tube body (201) is fixedly provided with the tube body (702), and the piston block (701) is slidably sleeved on the outer wall of the oil supply pipe (9) and is slidably sealed with the oil supply pipe (9). The inner wall of the tube body (702) is provided with an annular cavity (703), and the outer wall of the annular cavity (703) is thin-walled. An oil circuit 2 (704) for oil supply to annular cavity 2 (703) is provided inside piston block 1 (701), a first oil inlet hole (11) is provided on the outer wall of the oil supply pipe (9), and the inner cavity of tube body 1 (201) is connected to the inner cavity of the oil supply pipe (9) through the first oil inlet hole (11), and the first oil inlet hole (11) is located between the closed end side wall of the inner cavity of tube body 1 (201) and piston block 1 (701), a first oil circuit connecting hole (10) is also provided on the outer wall of the oil supply pipe (9), and after tube body 2 (702) extends out of tube body 1 (201), the oil circuit 2 (704) overlaps and connects with the first oil circuit connecting hole (10).

2. A fixture for processing a flexible wheel according to claim 1, characterized in that: The three-stage expansion assembly (8) includes a piston block 2 (801), a tube body 3 (802), an annular cavity 3 (803) and an oil circuit 3 (804). The piston block 2 (801) is arranged in the inner cavity of the tube body 2 (702) and is slidably sealed with the inner cavity of the tube body 2 (702). The tube body 3 (802) is fixedly arranged on the side of the piston block 2 (801) facing the opening of the tube body 1 (201), and the open end of the tube body 3 (802) faces the closed end of the tube body 1 (201). The piston block 2 (801) is sleeved on the outside of the oil supply pipe (9) and is slidably sealed with the oil supply pipe (9). The tube body 3 An annular cavity three (803) is provided inside the tube wall of (802), a second oil inlet hole (12) is provided on the outer wall of the oil supply pipe (9), and the position of the second oil inlet hole (12) on the oil supply pipe (9) is set on the side of the piston block two (801) facing the oil storage cylinder (102), an oil circuit three (804) for oil intake of the annular cavity three (803) is provided inside the piston block two (801), a second oil circuit connecting hole (13) is also provided on the outer wall of the oil supply pipe (9), and after the tube body three (802) is extended, the oil circuit three (804) is connected to the second oil circuit connecting hole (13).

3. A fixture for processing a flexible wheel according to claim 2, characterized in that: The oil supply pipe (9) is provided with a control pipe (14) slidingly inside, and the outer wall of the control pipe (14) is provided with a first tightening oil outlet hole (15) connected to the oil circuit 1 (203), a second tightening oil outlet hole (16) connected to the oil circuit 2 (704), and a third tightening oil outlet hole (17) connected to the oil circuit 3 (804). The outer wall of the control pipe (14) is also provided with a first oil outlet hole (18) connected to the first oil inlet hole (11), and a second oil outlet hole (19) connected to the second oil inlet hole (12). The first tightening oil outlet hole (15), the first oil outlet hole (18), the second oil outlet hole (19), the second tightening oil outlet hole (16) and the third tightening oil outlet hole (17) are arranged in sequence along the axial direction, and the spacing between the first oil outlet hole (18) and the first oil inlet hole (11) is the same as the spacing between the second tightening oil outlet hole (16) and the first oil circuit connecting hole (10), and the spacing between the second oil outlet hole (19) and the second oil inlet hole (12) is the same as the spacing between the third tightening oil outlet hole (17) and the second oil circuit connecting hole (13).

4. A fixture for processing a flexible wheel according to claim 3, characterized in that: When the first tightening oil outlet hole (15) is connected to the oil circuit 1 (203), the first oil outlet hole (18), the second oil outlet hole (19), the second tightening oil outlet hole (16) and the third tightening oil outlet hole (17) are staggered and closed with the first oil inlet hole (11), the second oil inlet hole (12), the first oil circuit connecting hole (10) and the second oil circuit connecting hole (13), respectively. When the first oil outlet hole (18) is connected to the first oil inlet hole (11), the second tightening oil outlet hole (16) is connected to the first oil circuit connecting hole (10), and the first tightening oil outlet hole (15) is staggered and closed with the first oil inlet hole (11), the second oil inlet hole (12), the first oil circuit connecting hole (10) and the second oil circuit connecting hole (13). ), the second oil outlet hole (19) and the third tightening oil outlet hole (17) are staggered and closed with the oil circuit 1 (203), the second oil inlet hole (12) and the second oil circuit connecting hole (13) respectively. When the second oil outlet hole (19) is connected with the second oil inlet hole (12), the third tightening oil outlet hole (17) is connected with the second oil circuit connecting hole (13). The first tightening oil outlet hole (15), the first oil outlet hole (18) and the second tightening oil outlet hole (16) are staggered and closed with the oil circuit 1 (203), the first oil inlet hole (11) and the first oil circuit connecting hole (10) respectively.

5. A fixture for processing a flexible wheel according to claim 4, characterized in that: The oil storage cylinder (102) is provided with a limiting column (21) for limiting the oil supply piston (3), the limiting column (21) is slidably inserted into the outer wall of one side of the oil storage cylinder (102) through the sliding hole (22), and the limiting column (21) and the sliding hole (22) are in sliding sealing cooperation, the limiting column (21) is positioned by a limiting component (23), the limiting component (23) includes a limiting sleeve (231) and an insert rod (232), the limiting sleeve (231) is fixedly provided on the end face of one side of the oil storage cylinder (102) and is concentric with the sliding hole (22), one end of the limiting column (21) is slidably inserted into the interior of the limiting sleeve (231), the outer wall of the limiting sleeve (231) is provided with a positioning socket (24), the limiting column (21) is fixedly provided with a positioning socket (24), and the limiting column (21) is fixedly provided with a positioning socket (24) ) is provided with a limiting hole 1 (25), a limiting hole 2 (26) and a limiting hole 3 (27) on the outer wall thereof; a plug rod (232) is plugged into the positioning socket (24), and the plug rod (232) is plugged into the limiting hole 1 (25), the limiting hole 2 (26) and the limiting hole 3 (27) respectively; the top end of the plug rod (232) is threadedly connected to the positioning socket (24); the positional relationship of the limiting hole 1 (25), the limiting hole 2 (26) and the limiting hole 3 (27) respectively corresponds to the limiting distance of the limiting column (21) when the tube body 2 (702), the tube body 3 (802) and the tube body 1 (201) are switched; a pressure sensor (28) is installed at the oil supply piston (3), and the pressure sensor (28) is coaxially arranged with the limiting column (21).

6. A fixture for processing a flexible wheel according to claim 5, characterized in that: One end of the limiting column (21) located inside the oil storage cylinder (102) is connected to one end of the control tube (14) through a connecting rod (29). When the limiting hole 1 (25) is connected to the positioning socket (24), the first oil inlet hole (11) is connected to the first oil outlet hole (18), and the first oil circuit connecting hole (10) is connected to the second tightening oil outlet hole (16). When the limiting hole 2 (26) is connected to the positioning socket (24), the second oil inlet hole (12) is connected to the second oil outlet hole (19), and the second oil circuit connecting hole (13) is connected to the third tightening oil outlet hole (17). When the limiting hole 3 (27) is connected to the positioning socket (24), the oil circuit 1 (203) is connected to the first tightening oil outlet hole (15).

7. A method for using a flexible wheel processing fixture according to claim 6, characterized in that: The following steps are involved: Step 1: First, clamp the fixture on the machine tool chuck; Step 2: Select and switch tube body 1 (201), tube body 2 (702) or tube body 3 (802) according to the different specifications of the flexible wheel; Step 3: After confirming the specifications of the flexible wheel, first unscrew the rod (232), and then move the limiting column (21) so that the corresponding positioning socket (24) is connected to the limiting hole 1 (25), the limiting hole 2 (26) or the limiting hole 3 (27). At the same time, the limiting column (21) will drive the control tube (14) to move synchronously. When the limiting column (21) is adjusted, the rod (232) is passed through the positioning socket (24) and inserted into the limiting hole, thereby limiting the moving distance of the oil supply piston (3) and controlling the oil inlet amount. Step 4: The flexible wheel is sleeved on the outside of the tube body 1 (201), the tube body 2 (702) or the tube body 3 (802) of the corresponding specifications, and the flexible wheel is sleeved on the thin wall, and the electric push rod (4) is started, so that the electric push rod (4) extends the shaft and pushes the oil supply piston (3), thereby squeezing the hydraulic oil inside the oil storage cylinder (102) into the inside of the control tube (14), and when the oil supply piston (3) moves, the oil supply piston (3) contacts the limit column (21), and the limit column (21) will limit and block the oil supply piston (3), so that the pressure sensor (28) at the oil supply piston (3) will be squeezed by the oil supply piston (3), and the extension shaft of the electric push rod (4) stops extending through the pressure sensor (28), and the hydraulic oil will enter the corresponding annular cavity to tighten the flexible wheel, completing the clamping; Step 5: After the flexspline is clamped and fixed, start the machine tool and perform precision turning on the outer circle of the flexspline; Step 6: After the processing is completed, the electric push rod (4) is extended and retracted, so that the extended shaft drives the oil supply piston (3) to return to one side of the oil storage cylinder (102), so that the oil supply piston (3) does not form pressure on the hydraulic oil, so that the oil pressure is released. The staff can reset the pipe body 1 (201), the pipe body 2 (702) and the pipe body 3 (802), and then remove the processed flexible wheel.

Images