A tooling fixture for a piston

Abstract

The present invention belongs to the technical field of piston production, and in particular to a tooling fixture for a piston, comprising: a chassis, which is annular and has a plurality of fixing holes, and is made of metal; an outer support plate, on which two outer support plates are symmetrical to each other and integrally formed with the chassis and have an arc-shaped cross-section, and are arranged at the outer edge of the upper end of the chassis; an outer buffer clamping assembly, on which an adjustable outer buffer clamping assembly is arranged; an inner support block, on which two inner support blocks corresponding to the outer support plates are arranged at the inner edge of the chassis; and an inner buffer clamping assembly, on which an inner buffer clamping assembly is adjustably arranged, and a fixed gap is formed between the outer buffer clamping assembly and the inner buffer clamping assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of piston production, and in particular relates to a tooling fixture for a piston. Background Art

[0002] The piston is a reciprocating component in the cylinder block of a car engine. Its main function is to withstand the gas pressure in the cylinder and transmit this force to the connecting rod through the piston pin to drive the crankshaft to rotate. It transmits the pressure of the combustion gas to the crankshaft, causing the crankshaft to rotate and output power.

[0003] The production of pistons requires piston head processing, piston skirt processing, head, tempering treatment, shot blasting, flushing, finishing and surface treatment, etc. During the processing, the piston needs to be clamped and fixed, but the clamping effect of traditional fixtures is not ideal, and one fixture is only suitable for fixing pistons of one specification. Summary of the invention

[0004] The purpose of the present invention is to provide a piston fixture which has a simple structure, is easy to clamp and is suitable for fixing pistons of different models in order to solve the above-mentioned technical problems.

[0005] In view of this, the present invention provides a piston fixture, comprising:

[0006] The chassis is annular and has a plurality of fixing holes, and is made of metal;

[0007] An outer support plate, two outer support plates with an arc-shaped cross section and symmetrical to each other and integrally formed with the chassis are arranged at the outer edge of the upper end of the chassis;

[0008] An external buffer clamping assembly, wherein an adjustable external buffer clamping assembly is arranged on the external support plate;

[0009] Inner support blocks, two inner support blocks corresponding to the outer support plates are arranged at the inner edge of the chassis;

[0010] The inner buffer clamping assembly is adjustably arranged on the inner support block, and a fixed gap is formed between the outer buffer clamping assembly and the inner buffer clamping assembly.

[0011] In the present technical solution, the chassis is used to be fixed to the mechanism of the conveying device or the fixing fixture, thereby improving the application range of the fixture; when fixing, the piston is inserted into the fixed gap, the outer wall of the piston is clamped by two external buffer clamping assemblies, and the inner wall of the piston is fixed by two internal buffer clamping assemblies, thereby facilitating the clamping of the piston.

[0012] In the above technical solution, further, the external buffer clamping assembly includes:

[0013] An outer arc-shaped plate, on which an outer guide rod penetrating the outer support plate and slidably connected is fixedly arranged, and a limit block is detachably arranged at one end of the outer guide rod away from the outer support plate;

[0014] An external buffer spring, the external buffer spring is sleeved on the external guide rod and has two ends abutting against the limit block and the external support plate;

[0015] An outer adjusting rod is threadedly arranged on the outer supporting plate, and the outer adjusting rod passes through the outer supporting plate and abuts against the outer arc-shaped plate;

[0016] External buffer pressing blocks: a plurality of evenly distributed external buffer pressing blocks are arranged on one side of the external arc-shaped plate away from the external support plate.

[0017] In the present technical solution, the outer arc plate is used to limit the outer wall of the piston. The cooperation of the outer guide rod and the outer adjusting rod can adjust the gap between the outer arc plate and the outer supporting plate, thereby realizing the fixation of the outer walls of pistons of different sizes and appropriately adjusting the tightness of the fixed piston; the outer buffer spring can ensure a good elastic support effect, thereby preventing the outer arc plate from moving away from the outer supporting plate; and the provision of an external buffer clamping block can further resist the outer wall of the piston, thereby preventing the outer wall of the piston from sliding.

[0018] In the above technical solution, further, the external buffer pressing block includes:

[0019] An inner buffer body is fixedly arranged inwardly on the opening of the outer buffer body, and the inner buffer body is a hollow spherical structure;

[0020] An outer buffer body, which is in a hollow oval shape with an opening;

[0021] Buffer fluid: The inner buffer body is filled with buffer fluid.

[0022] In the present technical solution, both the inner buffer body and the outer buffer body are made of elastic silicone, the buffer fluid is a thickened gel, and the interior of the outer buffer body is hollow and closed; when the outer wall of the piston is pressed between the two outer arc plates, it will squeeze the outer buffer clamping block on the two outer arc plates, thereby squeezing the outer buffer clamping block to deform, and at the same time, the initial outer buffer clamping block has a tendency to return to its original shape, thereby firmly holding the outer wall of the piston, and the filled buffer fluid can better ensure the fit to the outer wall of the piston, thereby ensuring the fixing effect of the piston.

[0023] In the above technical solution, further, a number of reinforcing ribs are evenly distributed and located inside the outer buffer body on the inner buffer body; and a number of elastic buffer protrusions are evenly distributed and connected to the outer buffer body on the side wall of the outer buffer body, and the thickness of the elastic buffer protrusions is less than the thickness of the outer buffer body.

[0024] In the present technical solution, the setting of reinforcing ribs can improve the structural strength of the inner buffer body itself, thereby ensuring that it will not rupture during the extrusion process; and when the outer buffer body with elastic buffer protrusions is squeezed, space is provided for the air inside it to be squeezed, thereby preventing the outer buffer body from bursting.

[0025] In the above technical solution, further, the inner buffer clamping assembly includes:

[0026] Inner support plate;

[0027] Inner guide rods, a plurality of evenly distributed inner guide rods fixedly arranged on the inner support plate and fixedly connected to the inner support plate, the inner guide rods pass through the inner support block and are movably connected to the inner support block, and a clamping block is arranged at the end of the inner guide rod;

[0028] An inner adjusting rod is threadedly connected to the inner supporting block and abuts against the inner supporting plate;

[0029] An inner clamping fixture is arranged on the inner support plate and is arranged opposite to the outer support plate.

[0030] In the present technical solution, the cooperation between the inner support plate, the inner guide rod and the inner adjusting rod can achieve the effect of adjusting the fixed gap, thereby fixing pistons of different thicknesses; and the inner clamping fixing piece is used to clamp the inner wall of the piston, thereby fixing the piston. When fixing, one side of the piston needs to be pressed into the fixed gap on one side, and then the piston is squeezed toward the other side, and then the other side of the piston is clamped into the fixed gap on the other side.

[0031] In the above technical solution, further, the inner clamping fixture includes:

[0032] An inner arc-shaped support sheet, the inner arc-shaped support sheet is coaxially arranged with the outer arc-shaped plate;

[0033] An inner buffer pad is arranged in the direction from the inner arc-shaped support sheet to the outer arc-shaped plate, and an anti-skid pattern is arranged in the direction from the inner arc-shaped support sheet to the outer arc-shaped plate.

[0034] In the present technical solution, the arc-shaped support piece is made of spring steel sheet, and under normal conditions, the center angle of the arc-shaped support piece is larger than the center angle of the outer arc-shaped plate, and the diameter of the arc-shaped support piece is larger than the inner diameter of the matching piston. When fixing the piston, one side of the arc-shaped support piece needs to be inserted into the piston, and then the piston is pushed toward the other side of the arc-shaped support piece, and then the other side of the arc-shaped support piece is inserted into the piston. Due to the large inner diameter of the arc-shaped support piece, it is squeezed and deformed and firmly pressed against the inner wall of the piston. The setting of the inner buffer pad can achieve good anti-scratch and elastic contact effects between the inner arc-shaped support piece and the piston.

[0035] In the above technical solution, further, the inner clamping fixture also includes:

[0036] A support seat, wherein two support seats symmetrical to each other and used for connecting with the inner support plate are arranged on the side of the inner arc-shaped support sheet away from the outer arc-shaped plate;

[0037] The support base includes:

[0038] A support member, the support member is arc-shaped and fixedly connected to the inner arc-shaped support sheet;

[0039] A hinge seat, one end of which is fixedly connected to the inner support plate, and the other end of which is fixedly connected to one side of the inner arc-shaped support sheet;

[0040] A movable connecting rod, one end of which is provided with a positioning portion and the other end is provided with a ball head portion. A spherical groove that cooperates with the ball head portion is formed on the side of the support member away from the hinge seat. One end of the positioning portion of the movable connecting rod passes through the inner support plate and is movably connected to the inner support plate, and the ball head portion cooperates with the spherical groove on the support member.

[0041] In the present technical solution, the support member is made of polyethylene elastomer and is fixed to the arc-shaped support sheet by bonding. The support member will follow the deformation when the inner arc-shaped support sheet undergoes elastic deformation, thereby providing good support for the arc-shaped support sheet. Multiple movable connecting rods can be provided. The hinge seat is used to provide good support for the support member when it is deformed, and a sliding groove is provided on the support member so that the hinge seat and the support member can float slightly. The movable connecting rod can provide support for the support member when it is deformed, and the cooperation between the spherical groove and the ball head can prevent the piston connecting rod from detaching from the support member.

[0042] In the above technical solution, further, the support seat also includes:

[0043] A support spring is sleeved on one end of the rod portion of the movable connecting rod, one end of the support spring abuts against the inner support plate, and the other end abuts against the ball head of the movable connecting rod.

[0044] In the technical solution, the setting of the support spring can provide a good elastic support effect for the support member.

[0045] The beneficial effects of the present invention are:

[0046] 1. The cooperation between the external buffer clamping assembly and the internal buffer clamping assembly can achieve good elastic support and fixing effects;

[0047] 2. The setting of the external buffer pressing block can better fix the outer wall of the piston;

[0048] 3. The setting of the inner clamping fixture can better limit the inner wall of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of the structure of the present invention;

[0050] Figure 2 is a top view of the present invention;

[0051] Figure 3 It is a schematic diagram of the structure of the external buffer pressing block of the present invention;

[0052] Figure 4 is a cross-sectional schematic diagram of the support seat in the present invention;

[0053] The markings in the figure are as follows: 1-chassis, 2-external support plate, 3-inner support block, 4-external arc plate, 5-external guide rod, 6-limiting block, 7-external buffer spring, 8-external adjusting rod, 9-external buffer body, 10-inner buffer body, 11-buffer fluid, 12-reinforcement rib, 13-elastic buffer protrusion, 14-inner support plate, 15-inner guide rod, 16-block, 17-inner adjusting rod, 18-inner arc support plate, 19-inner buffer pad, 20-support member, 21-hinge seat, 22-movable connecting rod, 23-support spring, 24-fixed gap. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0055] Embodiment 1:

[0056] This embodiment provides a piston fixture, including:

[0057] The chassis 1 is annular and has a plurality of fixing holes, and the chassis 1 is made of metal;

[0058] An outer support plate 2, two outer support plates 2 with an arc-shaped cross section and symmetrical to each other and integrally formed with the chassis 1 are arranged at the outer edge of the upper end of the chassis 1;

[0059] An external buffer clamping assembly, an adjustable external buffer clamping assembly is provided on the external support plate 2;

[0060] Inner support blocks 3, two inner support blocks 3 corresponding to the outer support plates 2 are arranged at the inner edge of the chassis 1;

[0061] The inner buffer clamping assembly is adjustably arranged on the inner support block 3, and a fixed gap 24 is formed between the outer buffer clamping assembly and the inner buffer clamping assembly.

[0062] In this embodiment, the chassis 1 is used to be fixed to a conveying device or a fixing fixture, thereby increasing the applicability of the fixture; when fixing, the piston is inserted into the fixing gap 24, the outer wall of the piston is clamped by two outer buffer clamping assemblies, and the inner wall of the piston is fixed by two inner buffer clamping assemblies, thereby facilitating the clamping of the piston.

[0063] Embodiment 2:

[0064] This embodiment provides a tooling fixture for a piston, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0065] The external buffer clamping assembly includes:

[0066] An outer arc-shaped plate 4, on which an outer guide rod 5 penetrating the outer support plate 2 and slidably connected is fixedly arranged, and a limit block 6 is detachably arranged at one end of the outer guide rod 5 away from the outer support plate 2;

[0067] An external buffer spring 7, which is sleeved on the external guide rod 5 and has two ends resting on the limit block 6 and the external support plate 2;

[0068] An outer adjusting rod 8 is threadedly provided on the outer supporting plate 2, and the outer adjusting rod 8 passes through the outer supporting plate 2 and abuts against the outer arc-shaped plate 4;

[0069] External buffer pressing blocks: a plurality of evenly distributed external buffer pressing blocks are arranged on the side of the external arc-shaped plate 4 away from the external support plate 2 .

[0070] In this embodiment, the outer arc plate 4 is used to limit the outer wall of the piston. The cooperation between the outer guide rod 5 and the outer adjusting rod 8 can adjust the gap between the outer arc plate 4 and the outer support plate 2, thereby realizing the fixation of the outer walls of pistons of different sizes and appropriately adjusting the tightness of the fixed piston; and the outer buffer spring 7 can ensure a good elastic support effect, thereby preventing the outer arc plate 4 from moving away from the outer support plate 2; and the provision of an external buffer clamping block can further play the role of resisting the outer wall of the piston, thereby preventing the outer wall of the piston from sliding.

[0071] Embodiment 3:

[0072] This embodiment provides a tooling fixture for a piston, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0073] The external buffer clamp includes:

[0074] An inner buffer body 10 is fixedly arranged inwardly on the opening of the outer buffer body 9, and the inner buffer body 10 is a hollow spherical structure;

[0075] An outer buffer body 9, which is in a hollow elliptical shape with an opening;

[0076] Buffer fluid 11 : The inner buffer body 10 is filled with the buffer fluid 11 .

[0077] In this embodiment, the inner buffer body 10 and the outer buffer body 9 are both made of elastic silicone, the buffer fluid 11 is a thickened gel, and the interior of the outer buffer body 9 is hollow and closed; when the outer wall of the piston is pressed between the two outer arc plates 4, it will squeeze the outer buffer clamping block on the two outer arc plates 4, thereby squeezing the outer buffer clamping block to deform, and at the same time, the initial outer buffer clamping block has a tendency to return to its original shape, thereby firmly holding the outer wall of the piston, and the filled buffer fluid 11 can better ensure the fit to the outer wall of the piston, thereby ensuring the fixing effect of the piston.

[0078] Embodiment 4:

[0079] This embodiment provides a tooling fixture for a piston, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0080] A plurality of uniformly distributed reinforcing ribs 12 are arranged on the inner buffer body 10 and located inside the outer buffer body 9; and a plurality of uniformly distributed elastic buffer protrusions 13 connected to the outer buffer body 9 are arranged on the side wall of the outer buffer body 9, and the thickness of the elastic buffer protrusions 13 is less than the thickness of the outer buffer body 9.

[0081] In this embodiment, the provision of the reinforcing ribs 12 can improve the structural strength of the inner buffer body 10 itself, thereby ensuring that it will not rupture during the extrusion process; and the provision of the elastic buffer protrusion 13 provides space for the air inside the outer buffer body 9 to be squeezed when it is contracted, thereby preventing the outer buffer body 9 from bursting.

[0082] Embodiment 5:

[0083] This embodiment provides a tooling fixture for a piston, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0084] The internal buffer clamping assembly includes:

[0085] Inner support plate 14;

[0086] Inner guide rods 15, a plurality of evenly distributed inner guide rods 15 fixedly provided on the inner support plate 14 and fixedly connected to the inner support plate 14, the inner guide rods 15 pass through the inner support block 3 and are movably connected to the inner support block 3, and a clamping block 16 is provided at the end of the inner guide rod 15;

[0087] An inner adjustment rod 17 is threadedly connected to the inner support block 3 and abuts against the inner support plate 14;

[0088] An inner clamping fixture is provided on the inner support plate 14 and is arranged opposite to the outer support plate 2 .

[0089] In this embodiment, the cooperation between the inner support plate 14, the inner guide rod 15 and the inner adjustment rod 17 can achieve the effect of adjusting the fixed gap 24, thereby fixing pistons of different thicknesses; and the inner clamping fixture is used to clamp the inner wall of the piston, thereby fixing the piston. When fixing, one side of the piston needs to be pressed into the fixed gap 24 on one side, and then the piston is squeezed toward the other side, and then the other side of the piston is clamped into the fixed gap 24 on the other side.

[0090] Embodiment 6:

[0091] This embodiment provides a tooling fixture for a piston, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0092] Internal clamping fixtures include:

[0093] An inner arc-shaped support sheet 18, the inner arc-shaped support sheet 18 is coaxially arranged with the outer arc-shaped plate 4;

[0094] The inner buffer pad 19 is provided on the direction of the inner arc-shaped support plate 18 toward the outer arc-shaped plate 4 , and the inner buffer pad 19 is provided with anti-slip patterns toward the direction of the outer arc-shaped plate 4 .

[0095] In this embodiment, the arc-shaped support sheet is made of spring steel sheet, and under normal conditions, the center angle of the arc-shaped support sheet is larger than the center angle of the outer arc-shaped plate 4, and the diameter of the arc-shaped support sheet is larger than the inner diameter of the matching piston. When fixing the piston, one side of the arc-shaped support sheet needs to be inserted into the piston, and then the piston is pushed toward the other side of the arc-shaped support sheet, and then the other side of the arc-shaped support sheet is inserted into the piston. Due to the large inner diameter of the arc-shaped support sheet, it is squeezed and deformed and firmly pressed against the inner wall of the piston. The setting of the inner buffer pad 19 can achieve good anti-scratch and elastic contact effects between the inner arc-shaped support sheet 18 and the piston.

[0096] Embodiment 7:

[0097] This embodiment provides a tooling fixture for a piston, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0098] The inner clamping fixture also includes:

[0099] Support seat: two support seats are provided on the side of the inner arc-shaped support sheet 18 away from the outer arc-shaped plate 4, which are symmetrical to each other and used to connect with the inner support plate 14;

[0100] The support base includes:

[0101] A support member 20, the support member 20 is arc-shaped and fixedly connected to the inner arc-shaped support sheet 18;

[0102] A hinge seat 21, one end of which is fixedly connected to the inner support plate 14, and the other end of which is fixedly connected to one side of the inner arc-shaped support sheet 18;

[0103] The movable connecting rod 22 has a positioning portion at one end and a ball head at the other end. A spherical groove that cooperates with the ball head is formed on the side of the support member 20 away from the hinge seat 21. One end of the positioning portion of the movable connecting rod 22 passes through the inner support plate 14 and is movably connected to the inner support plate 14. The ball head cooperates with the spherical groove on the support member 20 (2).

[0104] In this embodiment, the support member 20 is made of polyethylene elastomer and is fixed to the arc-shaped support sheet by bonding. When the inner arc-shaped support sheet 18 undergoes elastic deformation, the support member 20 will follow the deformation, thereby providing good support for the arc-shaped support sheet. Multiple movable connecting rods 22 can be provided. The hinge seat 21 is used to provide good support for the support member 20 when it is deformed, and a sliding groove is provided on the support member 20, so that the hinge seat 21 and the support member 20 can float slightly. The movable connecting rod 22 can provide support for the support member 20 when it is deformed, and the cooperation between the spherical groove and the ball head can prevent the piston connecting rod from detaching from the support member 20.

[0105] Embodiment 7:

[0106] This embodiment provides a tooling fixture for a piston, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0107] The support base also includes:

[0108] A support spring 23 is sleeved on one end of the rod portion of the movable connecting rod 22 , one end of the support spring 23 abuts against the inner support plate 14 , and the other end abuts against the ball head of the movable connecting rod 22 .

[0109] In this embodiment, the support spring 23 can provide a good elastic support effect for the support member 20 .

[0110] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A fixture for a piston, characterized in that: include: A chassis (1), the chassis (1) being annular and having a plurality of fixing holes; External support plates (2), two external support plates (2) having an arc-shaped cross section and being symmetrical to each other and integrally formed with the chassis (1) are arranged at the outer edge of the upper end of the chassis (1); An external buffer clamping assembly, wherein an adjustable external buffer clamping assembly is arranged on the external support plate (2); Inner support blocks (3), two inner support blocks (3) corresponding to the outer support plates (2) are arranged at the inner edge of the chassis (1); An internal buffer clamping assembly, wherein the internal buffer clamping assembly is adjustably arranged on the internal support block (3); The external buffer clamping assembly comprises: An outer arc-shaped plate (4), wherein an outer guide rod (5) penetrating the outer support plate (2) and slidably connected to the outer arc-shaped plate (4) is fixedly provided thereon, and a limit block (6) is detachably provided at one end of the outer guide rod (5) away from the outer support plate (2); An external buffer spring (7), wherein the external buffer spring (7) is sleeved on the external guide rod (5) and has two ends abutting against the limit block (6) and the external support plate (2); An external adjustment rod (8), wherein the external adjustment rod (8) is threadedly provided on the external support plate (2), and the external adjustment rod (8) passes through the external support plate (2) and abuts against the external arc-shaped plate (4); External buffer pressing blocks, wherein a plurality of evenly distributed external buffer pressing blocks are arranged on a side of the external arc-shaped plate (4) away from the external support plate (2); The external buffer pressing block comprises: An outer buffer body (9), the outer buffer body (9) being in the shape of a hollow ellipse with an opening; An inner buffer body (10), which is fixedly arranged inwardly on the opening of the outer buffer body (9), and has a hollow spherical structure; Buffer fluid (11), the inner buffer body (10) is filled with the buffer fluid (11); The inner buffer body (10) is provided with a plurality of reinforcing ribs (12) which are evenly distributed and located inside the outer buffer body (9); and the side wall of the outer buffer body (9) is provided with a plurality of elastic buffer protrusions (13) which are evenly distributed and connected to the outer buffer body (9).

2. A piston fixture according to claim 1, characterized in that: The internal buffer clamping assembly includes: Inner support plate (14); Inner guide rods (15), a plurality of evenly distributed inner guide rods (15) fixedly arranged on the inner support plate (14) and fixedly connected to the inner support plate (14), the inner guide rods (15) passing through the inner support block (3) and movably connected to the inner support block (3), and a clamping block (16) being arranged at the end of the inner guide rod (15); An inner adjustment rod (17), wherein the inner support block (3) is threadedly connected with the inner adjustment rod (17) which abuts against the inner support plate (14); An inner clamping fixture is provided on the inner support plate (14) and is arranged opposite to the outer support plate (2).

3. A piston fixture according to claim 2, characterized in that: The inner clamping fixture comprises: An inner arc-shaped support plate (18), wherein the inner arc-shaped support plate (18) is coaxially arranged with the outer arc-shaped plate (4); An inner buffer pad (19) is provided on the inner arc-shaped support sheet (18) in a direction toward the outer arc-shaped plate (4).

4. A piston fixture according to claim 3, characterized in that: The inner clamping fixture also includes: A support seat, wherein two support seats are provided on a side of the inner arc-shaped support sheet (18) away from the outer arc-shaped plate (4) and are symmetrical to each other and used for connecting to the inner support plate (14); The support seat comprises: A support member (20), wherein the support member (20) is arc-shaped and fixedly connected to the inner arc-shaped support sheet (18); A hinge seat (21), wherein one end of the hinge seat (21) is fixedly connected to the inner support plate (14), and the other end of the hinge seat (21) is fixedly connected to one side of the inner arc-shaped support sheet (18); A movable connecting rod (22), one end of the movable connecting rod (22) having a positioning portion and the other end having a ball head, a side of the support member (20) away from the hinge seat (21) having a spherical groove that cooperates with the ball head, one end of the positioning portion of the movable connecting rod (22) passes through the inner support plate (14) and is movably connected to the inner support plate (14), and the ball head cooperates with the spherical groove on the support member (20).

5. A piston fixture according to claim 4, characterized in that: The support seat also includes: A support spring (23) is sleeved on one end of the rod portion of the movable connecting rod (22), one end of the support spring (23) abuts against the inner support plate (14), and the other end abuts against the ball head of the movable connecting rod (22).

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