CN110076599B

CN110076599B - Clamping fixing device

Info

Publication number: CN110076599B
Application number: CN201910495445.4A
Authority: CN
Inventors: 秦沈杰; 薛松; 蒋恩; 徐杰; 周祖谦
Original assignee: Shanghai No1 Machine Tool Works Co ltd
Current assignee: Shanghai No1 Machine Tool Works Co ltd
Priority date: 2019-06-10
Filing date: 2019-06-10
Publication date: 2021-08-24
Anticipated expiration: 2039-06-10
Also published as: CN110076599A

Abstract

The invention discloses a clamping and fixing device which comprises a supporting seat, a backing ring, an auxiliary supporting seat and a pressing plate, wherein the supporting seat is fixedly connected with the backing ring; the support seat is combined with the bottom plate through the side frame to form a clamping fixing cavity which can accommodate and support a workpiece; the backing ring is arranged on the inner side surface of a top ring plate of the side frame and can abut against and support the upper part of the workpiece; the pressing plate is arranged on one side, away from the bottom ring plate of the side frame, of the top ring plate, so that a workpiece can be clamped and fixed; the device overcomes the technical problem that the clamping and fixing device cannot be overturned, improves the processing rigidity and ensures the processing precision; in addition, the device has simple structure, low manufacturing cost and wide application range.

Description

Clamping fixing device

Technical Field

The invention relates to the technical field of machining equipment, in particular to a clamping and fixing device for a flow distribution assembly.

Background

In the work piece course of working, the fixed subassembly of clamping usually can have fixed effect not good, the processing rigidity is lower and anchor clamps can not overturn etc. technical problem, especially in the turning process of circle in the major diameter, above-mentioned clamping problem is especially outstanding. Taking the flow distribution assembly as an example, the flow distribution assembly is generally bowl-shaped, the diameter of the inner wall of the flow distribution assembly is as long as 1.75m, and a large number of through holes are vertically distributed on the side wall of the flow distribution assembly. The inner circle structure, the large diameter, the large number of through holes and other structures and processing technology characteristics greatly increase the clamping and fixing difficulty in the processing process of the flow distribution assembly. The clamping technical problem faced by the flow distribution assembly not only directly affects the processing rigidity and the processing precision of the flow processing assembly, but also even affects the yield and the production cost of the flow assembly. Therefore, it is desirable to provide a clamping fixture to solve the above problems.

Disclosure of Invention

The invention aims to solve the problems and provides a clamping and fixing device which can clamp and fix a machined workpiece through the combined action of components such as a supporting seat, a backing ring, an auxiliary support, a pressing plate and the like; the clamping and fixing device provided by the invention overcomes the technical problem that the existing clamping and fixing device cannot be overturned, and simultaneously can improve the processing rigidity and ensure the processing precision; in addition, the device has simple structure, low manufacturing cost and wide application range.

In order to achieve the purpose, the invention adopts the following technical scheme.

A clamping fixture, comprising: the supporting seat comprises a side frame and a bottom plate, the side frame comprises a top ring plate arranged at the top of the side frame, a bottom ring plate arranged at the bottom of the side frame and a plurality of supporting columns, each supporting column is arranged between the top ring plate and the bottom ring plate to support the top ring plate and the bottom ring plate, the bottom plate is arranged at the bottom of the side frame, the side frame and the bottom plate form a clamping fixing cavity to accommodate a workpiece, and the bottom plate is used for supporting the bottom of the workpiece; the backing ring is arranged on the inner side surface of the top ring plate, the inner side surface of the backing ring is matched with the outer side surface of the workpiece, and the backing ring can abut against the outer side surface of the workpiece so as to support the upper part of the workpiece; the auxiliary supports are arranged on one side, facing the top of the side frame, of the bottom plate and can abut against the outer side face of the workpiece so as to support the middle and the lower part of the workpiece; and the pressing plates are arranged on one surface of the top ring plate, which is opposite to the bottom ring plate, and can be abutted against the end surface of the workpiece so as to fix the workpiece.

Furthermore, the bottom plate comprises a central plate and a plurality of connecting plates, the central plate is positioned in the center of the bottom plate, one end of each connecting plate is connected with the bottom ring plate or the supporting column, the other end of each connecting plate is connected with the central plate, and the auxiliary support is arranged on the connecting plate.

Furthermore, a protrusion extending towards the top of the side frame is arranged on the central plate, and the protrusion can support the bottom of the workpiece.

Furthermore, the auxiliary support comprises a first supporting part and a second supporting part, wherein the first supporting part is vertically arranged, the second supporting part is horizontally arranged and is fixedly connected with the first supporting part, and the first supporting part and the second supporting part can be respectively abutted to the outer side face of the workpiece.

Further, first supporting part includes a vertical setting and is in the stand of bottom ring board one side is kept away from to the connecting plate keep away from of stand the one end of connecting plate is equipped with first gasket subassembly, first gasket subassembly can the butt the lateral surface of work piece, the second supporting part include a level set up and with stand lateral wall fixed connection's horizontal pole the horizontal pole is kept away from the one end of stand is provided with a second gasket subassembly, second gasket subassembly can the butt the lateral surface of work piece.

Further, the first cushion block assembly and the second cushion block assembly are provided with contact surfaces, and the contact surfaces are matched with the outer side surfaces of the workpieces and can abut against the middle or lower parts of the workpieces.

The first cushion block assembly and the second cushion block assembly both comprise:

the fixing piece comprises a first side edge and a second side edge, the first side edge is fixedly connected with the upright post or the cross rod, the second side edge extends towards the direction far away from the upright post or the cross rod, the second side edge is connected with the first side edge, and an included angle is formed between the second side edge and the first side edge;

the cushion block body is arranged on one side of the first side edge, opposite to the upright post or the cross bar, and is in sliding connection with the first side edge, and the cushion block body further comprises a contact surface so as to abut against the outer side surface of the workpiece;

at least one adjusting piece, with second side spiro union, just the adjusting piece run through behind the second side with this body coupling of cushion, the adjusting piece can drive the cushion body is relative first side removes.

Furthermore, the second cushion block component further comprises a supporting piece, one end of the supporting piece is fixedly connected with the second side edge, and the other end of the supporting piece is fixedly connected with the connecting plate so as to support the second cushion block component.

Furthermore, the supporting seat further comprises a plurality of sizing blocks, and the sizing blocks are respectively arranged on one sides, far away from the top surfaces of the side frames, of the bottom ring plate and the central plate, so that the flange surfaces of the workpieces are horizontal.

Further, the backing ring comprises a plurality of arc sections, the arc sections are connected with each other and are all fixed on the inner side surface of the top ring plate.

Furthermore, the inner side surface of the top ring plate is provided with a boss, and the backing ring is arranged on the boss.

Further, the supporting seat further comprises a plurality of lifting lugs, the lifting lugs are arranged on the outer side face of the top ring plate or the outer side face of the supporting column, and the lifting lugs are pulled to enable the clamping and fixing device to overturn.

Furthermore, one end of the outer side surface of at least one support column, which is close to the bottom ring plate, is in a circular arc configuration.

The clamping and fixing device has the advantages that:

1. the supporting seat, the backing ring, the auxiliary supporting seat and the pressing plate component are used together to clamp and position a workpiece to be machined, so that the rigidity of a machining tool and the rigidity of the workpiece can be guaranteed, and the machining precision is improved.

2. The workpiece can be pressed and fixed on the supporting seat through the pressing plate, so that the workpiece can deviate or vibrate in the machining process, and the machining precision of the workpiece is influenced.

3. The device has simple structure, low cost and wide application range.

Drawings

FIG. 1 is a top view of a workpiece mounted on a clamping fixture of the present invention (workpiece 6 having a plurality of vertical through holes not shown);

FIG. 2 is a view A-A of FIG. 1;

FIG. 3 is a cross-sectional view of the clamping fixture of the present invention;

FIG. 4 is a top view of the support base;

FIG. 5 is a view B-B of FIG. 4;

FIG. 6 is a front view of a circular arc segment of the backing ring;

FIG. 7 is a top view of a circular arc segment of the backing ring;

FIG. 8 is a partial cross-sectional view of a front view of the accessory mount;

fig. 9 is a partial sectional view of a top view of the accessory mount.

The reference numerals in the figures are respectively:

1. a supporting seat; 11. A side frame;

111. a top ring plate; 112. A support pillar;

113. a bottom ring plate; 114. Reinforcing ribs;

115. a boss; 12. A base plate;

121. a connecting plate; 122. A central plate;

123. a platform; 124. A protrusion;

13. sizing block; 2. A backing ring;

21. a circular arc section; 3. Lifting lugs;

4. an auxiliary support; 41. A first support section;

411. a column; 42. A second support portion;

421. a cross bar; 422. A support member;

43a, a first pad assembly; 43b, a second pad assembly;

431. a cushion block body; 432. A fixing member;

432a, a first side; 432b, a second side edge;

432c, screw holes; 433. An adjustment member;

434. positioning the bolt; 5. Pressing a plate;

6. a workpiece; s, contact surface.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Please refer to fig. 1 and fig. 2. The clamping and fixing device comprises a supporting seat 1, a backing ring 2, a plurality of auxiliary supporting seats 4 and a plurality of pressing plates 5.

Please refer to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5. The support seat 1 comprises a side frame 11 and a bottom plate 12.

The side frame 11 includes a top ring plate 111 disposed at the top of the side frame 11, a bottom ring plate 113 disposed at the bottom of the side frame 11, and a plurality of support pillars 112. The supporting column 112 is disposed between the top ring plate 111 and the bottom ring plate 113, one end of the supporting column 112 is fixedly connected to the top ring plate 111, and the other end of the supporting column 112 is fixedly connected to the bottom ring plate 113 to support the top ring plate 111 and the bottom ring plate 113. That is, the plurality of support pillars 112 are integrally connected by the top ring plate 111 and the bottom ring plate 113 to form the side frame 11.

In this embodiment, one end of the outer side surface of at least one of the supporting pillars 112, which is close to the bottom ring plate 113, adopts an arc configuration (as indicated by an arrow in fig. 2), and the outer side surface of the arc configuration can be used as a supporting point of the supporting seat 1, so as to facilitate the integral turning of the clamping and fixing device. The supporting column 112 has a cavity structure, and a plurality of reinforcing ribs 114 are arranged in the cavity structure, so that the purpose of reducing the self weight of the supporting seat 1 is achieved, and the rigidity and the supporting strength of the supporting seat 1 cannot be reduced. In this embodiment, the supporting seat 1 includes eight supporting pillars 112, and the supporting pillars 112 are arranged in parallel at equal intervals. In addition, in the actual production or design process, the number of the supporting columns 112 can be increased or decreased or the distribution positions of the supporting columns 112 can be changed according to the size of the workpiece 6 actually clamped by the clamping and fixing device, so as to increase the stability of the supporting seat 1.

The bottom plate 12 is arranged at the bottom of the side frame 11, the bottom plate 12 is fixedly connected with the side frame 11 to form a clamping fixing cavity, a workpiece 6 can be accommodated in the clamping fixing cavity, and the bottom plate 12 can abut against and support the bottom of the workpiece 6. Specifically, the bottom of the workpiece 6 is in contact with the bottom plate 12 so that the bottom plate 12 can support the workpiece 6.

The bottom plate 12 includes a central plate 122 located at the center of the bottom plate 12 and a plurality of connecting plates 121. One end of the connecting plate 121 is fixedly connected to the bottom ring plate 113 or the supporting column 112, and the other end of the connecting plate 121 is fixedly connected to the central plate 122. That is, the connecting plates 121 extend from the periphery of the central plate 122 to the bottom of the side frame 11 and are fixedly connected to the supporting pillars 112 or the bottom ring plate 113, so as to form the hollow bottom plate 12. The hollow bottom plate 12 not only ensures the supporting effect on the bottom of the workpiece 6, but also reduces the overall weight of the supporting seat 1, increases the flexibility of the clamping and fixing device, and reduces the operation difficulty of turning the workpiece 6.

In this embodiment, the connecting plates 122 are disposed corresponding to the supporting columns 112, i.e., the bottom plate 12 includes eight connecting plates 121. In other embodiments, the number of the connecting plates 121 can be changed according to actual requirements, so as to increase the stability of the connection between the central plate 122 and the side frame 11, i.e., increase the stability of the supporting seat 1.

Further, a platform 123 is disposed on one side of the connecting plate 121 facing the top ring plate 111, and the platform 123 is connected to the connecting plate 121 and the supporting column 112 corresponding to the connecting plate 121, so as to fixedly connect the connecting plate 121 and the supporting column 112 corresponding to the connecting plate 121. In addition, the connecting plate 121 and the central plate 122 both adopt a double-layer structure, and are connected into a whole in a welding manner, the top layer of one end of the connecting plate 121 close to the bottom of the side frame 11 is fixedly connected with the corresponding supporting column 112, and the bottom layer thereof is connected with the bottom ring plate 113 into a whole, so that the connecting strength of the bottom plate 12 and the side frame 11 is increased.

Furthermore, a protrusion 124 extending toward the top of the side frame 11 is disposed at the center of the center plate 122, and the protrusion 124 can support the bottom of the workpiece 6. In this embodiment, the protrusion 124 is a fastening bolt screwed on the central plate 122, which can finely adjust the supporting height of the bottom plate 12, so as to ensure the abutting supporting effect of the bottom plate 12 on the workpiece 6. In addition, a cushion layer (not shown in the drawings) is disposed between the protrusion 124 and the workpiece 6, and the cushion layer is made of stainless steel sheet to prevent the protrusion 124 from damaging the bottom of the workpiece 6.

In addition, the supporting seat 1 further includes a plurality of sizing blocks 13, and the sizing blocks 13 are fixedly disposed on the supporting columns 112 and the side of the central plate 122 far away from the top ring plate 111. The thickness of the sizing block 13 is adjustable, and after the workpiece 6 is fixed on the clamping fixing device, the flange surface of the workpiece 6 can be leveled by adjusting the sizing block 13.

Please continue to refer to fig. 1, fig. 2 and fig. 3. The backing ring 2 is arranged on the inner side surface of the top ring plate 111, and the inner side surface of the backing ring 2 is matched with the outer side surface of the workpiece 6 and can be abutted against the outer side surface of the workpiece 6 to support the upper part of the workpiece 6. The backing ring 2 can increase the stress area between the clamping and fixing device and the workpiece 6 and adjust the stress direction, so that the uniformity and stability of the clamping and fixing device for clamping the upper part of the workpiece 6 can be guaranteed. In the present embodiment, a boss 115 (please refer to fig. 5) is disposed on the inner side of the top ring plate 111, and the backing ring 2 is disposed on the boss 115 on the inner side of the top ring plate 111.

Please refer to fig. 6 and 7. The backing ring 2 comprises a plurality of circular arc segments 21. The circular arc sections 21 are connected with each other and are all fixedly arranged on the inner side surface of the top ring plate 111. In this embodiment, backing ring 2 includes eight circular arc section 21, adjacent circular arc section 21 adopt screw fixed connection, and each simultaneously through the cooperation joint of ladder face circular arc section 21 with the radial fixed connection of top crown plate 111. In other embodiments of the present invention, the number of the circular arc segments 21 may be set according to actual requirements, which is not limited herein.

Please continue to refer to fig. 1, fig. 2 and fig. 3. The auxiliary support 4 is fixedly arranged on one side of the bottom plate 12 facing the top of the side frame 11 and can abut against the outer side surface of the workpiece 6 so as to support the middle part and the lower part of the workpiece 6. In this embodiment, the auxiliary support 4 is fixedly disposed on a side of the connecting plate 121 facing the top ring plate 111.

Please refer to fig. 8 and fig. 9. The auxiliary support 4 comprises a first support part 41 arranged vertically and a second support part 42 arranged horizontally and fixedly connected with the first support part 41, and the first support part 41 and the second support part 42 are respectively abutted against the outer side of the workpiece 6. Through setting up auxiliary support 4 has increased a plurality of support points to 6 middle parts of work pieces and lower part, has ensured the homogeneity of the atress of 6 lateral walls of work pieces, has increased the rigidity of the processing of work piece 6.

In the clamping and fixing device of the invention, the bottom plate 12 can support the bottom of the workpiece 6, the first supporting part 41 and the second supporting part 42 of the auxiliary support 4 can respectively support the middle part and the lower part of the workpiece 6, and the backing ring 2 can support the upper part of the workpiece 6, so that the clamping and fixing device can provide good support for the workpiece 6, the processing rigidity of the workpiece 6 can be effectively improved, and the inner circle processing precision and the surface roughness of the workpiece 6 can be more easily ensured.

In this embodiment, the first supporting portion 41 includes a vertical column 411 vertically disposed on the top of the connecting plate 121, and a first pad assembly 43a is disposed at one end of the vertical column 411 away from the connecting plate 121; the second supporting portion 42 includes a horizontal bar 421 horizontally disposed and fixedly connected to the sidewall of the upright column 411, and a second pad assembly 43b is disposed at one end of the horizontal bar 421 away from the upright column 411. The first cushion block assembly 43a and the second cushion block assembly 43b are provided with a contact surface S, and the contact surface S is matched with the outer side surface of a workpiece 6 and can abut against the middle or the lower part of the workpiece 6. Further, one side of the upright column 411, which is far away from the cross bar 421, is fixedly connected with the platform 123, so as to increase the stability of the auxiliary support 4.

The first and

second pad assemblies

43a and 43b each include a fixing member 432, a pad body 431, and at least one adjusting member 433.

The fixing member 432 includes a first side 432a and a second side 432b, the first side 432a with the stand 411 or the cross bar 421 fixed connection, the second side 432b extends towards the direction of keeping away from the stand 411 or the cross bar 421, the second side 432b with the first side 432a is connected, and the second side 432b with the first side 432a has an included angle. In this embodiment, the first side 432a and the second side 432b are perpendicular to each other and fixedly connected, and the second side 432b has at least one screw hole 432c penetrating through the second side 432 b.

The pad body 431 has a contact surface S. The contact surface S is in contact with the workpiece 6. The pad body 431 is disposed on a side of the first side 432a away from the upright 411 or the cross bar 421, and the pad body 431 is slidably connected to the first side 432 a. Specifically, the pad body 431 and the first side 432a are slidably connected by a positioning bolt 434 and a slide hole (not shown in the drawings) having a diameter larger than the outer diameter of the positioning bolt 434. For example, in the present embodiment, in the first pad assembly 43a, the sliding hole is disposed inside the pad body 431, the positioning bolt 434 is fixed to the first side 432a, the positioning bolt 434 is inserted into the sliding hole and is engaged with the positioning bolt 434 in a limiting manner by a nut matched with the positioning bolt 434, so as to prevent the pad body 431 from slipping; in the second pad assembly 43b, the positioning bolt 434 is fixedly connected to the pad body 431, the sliding hole is disposed on the first side 432a, and the positioning bolt 434 is inserted into the sliding hole and is engaged with the positioning bolt 434 in a nut-limited manner to prevent the pad body 431 from slipping.

The adjusting piece 433 is in threaded connection with the second side edge 432b, the adjusting piece 433 penetrates through the second side edge 432b and then is connected with the cushion block body 431, and the adjusting piece 433 can drive the cushion block body 431 to move relative to the first side edge 432 a. Specifically, the adjusting member 433 is screwed to the second side 432b through the screw hole 432c, one end of the adjusting member 433 can penetrate through the second side 432b, and the penetrating end is fixedly connected to the cushion block body 431. That is, the position of the pad body 431 can be adjusted along the radial direction of the workpiece 6 by changing the relative position of the adjusting member 433 and the second side 432b to abut against the workpiece 6 through the contact surface S, thereby increasing the support of the clamping and fixing device to the workpiece.

In this embodiment, the adjusting member 433 is an adjusting bolt. The cushion block body 431 in the first cushion block assembly 43a is large in size, and two adjusting pieces 433 are correspondingly arranged, so that the distance between the cushion block body 431 and the workpiece 6 can be uniformly adjusted along the radial direction of the workpiece 6, and the influence on the supporting effect caused by poor contact between the cushion block body 431 and the workpiece 6 is prevented. The second pad assembly 43b further comprises a supporting member 422, one end of the supporting member 422 is fixedly connected to the second side edge 432b, and the other end of the supporting member 422 is fixedly connected to the connecting plate 121, so that the stability and the supporting strength of the second pad assembly 43b are improved. In this embodiment, the supporting member 422 is a bolt.

Please continue to refer to fig. 1 and fig. 2. The pressing plate 5 is disposed on a surface of the top ring plate 111 opposite to the bottom ring plate 113, and the pressing plate 5 can abut against an end surface of the workpiece 6 to fix the workpiece 6. Specifically, the pressing plate 5 can press and fix the workpiece 6, so as to prevent the workpiece 6 from shifting or vibrating during the machining process, thereby affecting the machining accuracy of the workpiece 6. In this embodiment, the pressing plate 5 is fixedly connected to the supporting base 1 through bolts. The pressing plate 5 may adopt a structure that is conventional in the art and can play a role in compressing and fixing, and will not be described in detail herein.

Further, the clamping fixing device further comprises a plurality of lifting lugs 3, the lifting lugs 3 are fixedly arranged on the outer side face of the top ring plate 111 or the outer side face of the supporting column 112, so that the supporting seat 1 can be conveniently pulled, and the overturning difficulty of the clamping fixing device can be reduced.

After being clamped by the clamping and fixing device, a workpiece 6 is arranged on a lathe or special equipment to rotate so as to be subsequently processed. The clamping and fixing device is simple in structure and reasonable in layout, can effectively improve the machining rigidity of the workpiece 6, can more easily ensure the inner circle machining precision and the surface roughness of the workpiece 6, can reduce the equipment use cost of a machine tool and a cutter, improves the machining efficiency, and obviously reduces the manufacturing period.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a clamping fixing device for the flow distribution subassembly that the clamping is the bowl form, its characterized in that includes:

the supporting seat comprises a side frame and a bottom plate, the side frame comprises a top ring plate arranged at the top of the side frame, a bottom ring plate arranged at the bottom of the side frame and a plurality of supporting columns, one end, close to the bottom ring plate, of the outer side surface of at least one supporting column is in an arc configuration, each supporting column is arranged between the top ring plate and the bottom ring plate so as to support the top ring plate and the bottom ring plate, the bottom plate is arranged at the bottom of the side frame and comprises a central plate and a plurality of connecting plates, the central plate is located in the center of the bottom plate, one end of each connecting plate is connected with the bottom ring plate or the corresponding supporting column, the other end of each connecting plate is connected with the central plate, the side frame and the bottom plate form a clamping fixing cavity so as to accommodate a workpiece, and the bottom plate is used for supporting the bottom of the workpiece;

the backing ring is arranged on the inner side surface of the top ring plate, the inner side surface of the backing ring is matched with the outer side surface of the workpiece, and the backing ring can abut against the outer side surface of the workpiece so as to support the upper part of the workpiece;

the auxiliary supports are arranged on the connecting plate and comprise a first supporting part which is vertically arranged and a second supporting part which is horizontally arranged and fixedly connected with the first supporting part, the first supporting part comprises a stand column which is vertically arranged on one side, far away from the bottom ring plate, of the connecting plate, a first cushion block assembly is arranged at one end, far away from the connecting plate, of the stand column, the first cushion block assembly can abut against the outer side face of the workpiece, the second supporting part comprises a cross rod which is horizontally arranged and fixedly connected with the side wall of the stand column, a second cushion block assembly is arranged at one end, far away from the stand column, of the cross rod, and the second cushion block assembly can abut against the outer side face of the workpiece;

the pressing plates are arranged on one surface of the top ring plate opposite to the bottom ring plate and can abut against the end face of the workpiece to fix the workpiece; and the number of the first and second groups,

the lifting lugs are arranged on the outer side face of the top ring plate or the outer side face of the supporting column and are pulled to enable the clamping fixing device to overturn.

2. The clamping fixture of claim 1 wherein said central plate has a projection extending toward the top of said side frame, said projection being adapted to support the bottom of said workpiece.

3. The clamping and fixing device of claim 1, wherein the first and second pad assemblies each have a contact surface that mates with an outer side of the workpiece and can abut against a middle or lower portion of the workpiece.

4. The clamping fixture of claim 3, wherein the first and second pad assemblies each comprise:

5. The clamping and fixing device as recited in claim 4, wherein the second pad assembly further comprises a support member, one end of the support member is fixedly connected to the second side edge, and the other end of the support member is fixedly connected to the connecting plate, so as to support the second pad assembly.

6. The clamping fixture of claim 1, wherein said support base further comprises a plurality of pads, said pads being disposed on a side of said bottom ring plate and said center plate, respectively, away from said top surface of said side frame, to level said flange surface of said workpiece.

7. The clamping fixture device of claim 1, wherein the backing ring comprises a plurality of circular arc segments, the circular arc segments are connected to each other and are all fixed on the inner side surface of the top ring plate.

8. The clamping fixture of claim 1, wherein the inner side of the top ring plate has a boss, and the backing ring is disposed on the boss.