CN216226939U

CN216226939U - Workpiece pressing and fixing device

Info

Publication number: CN216226939U
Application number: CN202122853497.XU
Authority: CN
Inventors: 刘锦烽; 何彩梅; 蔡顺华; 罗志清; 陈世举
Original assignee: Shenzhen Donghui Precision Mechanical & Electrical Co ltd
Current assignee: Shenzhen Donghui Precision Mechanical & Electrical Co ltd
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2022-04-08
Anticipated expiration: 2031-11-19

Abstract

The utility model relates to a fixing device is being pressed to work piece, belong to the technical field that the lathe pressed from both sides the dress, it includes the chuck, fixed block and fixed establishment, the fixed block sets up on the chuck, fixed establishment sets up on the fixed block, fixed establishment includes the first mounting and the second mounting of a plurality of quantity, place the cyclic annular machined part that remains to be processed on the fixed block, one side butt of fixed block is kept away from with the first cyclic annular portion of cyclic annular machined part to first mounting, one side butt of fixed block is kept away from with the second cyclic annular portion of cyclic annular machined part to the second mounting, first mounting and second mounting are used for fixed cyclic annular machined part. This application has the effect that improves the merry go round machine to the processingquality of cyclic annular machined part.

Description

Workpiece pressing and fixing device

Technical Field

The application relates to the technical field of lathe clamping, in particular to a workpiece pressing and fixing device.

Background

The vertical lathe is a large mechanical device and is used for processing large and heavy workpieces with large radial size, relatively small axial size and complex shape, such as cylindrical surfaces, end surfaces, cylindrical holes, conical holes and the like of various disc, wheel and sleeve workpieces. When machining a workpiece, a jig is required to be applied to the workpiece in order to machine the workpiece.

One of the annular workpieces comprises a workpiece main body, a first annular part 211 and a second annular part 212, wherein the first annular part 211 and the second annular part 212 are connected to two sides of the workpiece main body, and the first annular part 211 and the second annular part 212 of the annular workpiece are required to be processed. In the related art, when the vertical lathe is used for processing the annular workpiece, the workpiece is generally fixed by adopting a hydraulic chuck positioning and clamping mode, and when the clamping jaw of the hydraulic chuck is used for fixing the workpiece, the workpiece is extruded, so that the workpiece is easy to deform.

In view of the above-described related art, the inventors consider that there is a defect that affects the processing quality of the ring-shaped workpiece by the vertical lathe.

SUMMERY OF THE UTILITY MODEL

In order to improve the processingquality of merry go round machine to cyclic annular machined part, this application provides a work piece and is pressing fixing device.

The application provides a fixing device is being pressed to work piece adopts following technical scheme:

the utility model provides a fixing device is being pressed to work piece, includes chuck, fixed block and fixed establishment, the fixed block sets up on the chuck, fixed establishment sets up on the fixed block, fixed establishment includes the first mounting and the second mounting of a plurality of quantity, place the cyclic annular machined part that remains to process on the fixed block, one side butt of fixed block is kept away from with the first cyclic annular portion of cyclic annular machined part to first mounting, one side butt of fixed block is kept away from with the second cyclic annular portion of cyclic annular machined part to the second mounting, first mounting and second mounting are used for fixed cyclic annular machined part.

Through adopting above-mentioned technical scheme, the chuck is installed on the floor standing machine body, the fixed block is installed on the chuck, as the installation carrier of installation fixed establishment, add man-hour, put cyclic annular machined part on the fixed block earlier, then set up first mounting and second mounting on the fixed block, one side butt that the fixed block was kept away from with first cyclic annular portion to first mounting, one side butt that the fixed block was kept away from with second cyclic annular portion to the second mounting, fix cyclic annular machined part on the fixed block, and first mounting and second mounting are through pressing fixed cyclic annular machined part, reduce the extrusion to cyclic annular machined part side, thereby the condition of the deformation of cyclic annular machined part when being fixed has been reduced, the processingquality of floor standing machine to cyclic annular machined part has been improved.

Optionally, the first fixing member includes a first fixing body and a first abutting plate connected to the first fixing body, the first fixing body is detachably/slidably connected to the fixing block, and the first abutting plate abuts against one end, far away from the fixing block, of the first annular portion of the annular workpiece; the second fixing part comprises a second fixing body and a second abutting plate connected with the second fixing body, the second fixing body is detachably/slidably connected with the fixing block, and the second abutting plate is abutted to one end, away from the fixing block, of a second annular part of the annular workpiece.

By adopting the technical scheme, when the first annular part of the annular workpiece is machined, the first fixing main body is firstly detached from the fixing block, or the first fixing main body slides away from the annular machining part and is not fixed any more, so that the machining of the first annular part is not influenced, and only the second fixing part is used for machining the annular workpiece; when the second annular part of the annular workpiece needs to be machined, the second fixing main body is firstly detached from the fixing block, or the second fixing main body slides away from the annular machining part and is not fixed any more, so that the machining of the second annular part is not influenced, and only the first fixing part is used for machining the annular workpiece; the first abutting plate of the first fixing piece abuts against the first annular part of the annular workpiece, and the second abutting plate and the second annular part of the annular workpiece realize that the fixing mechanism fixes the annular workpiece so as to machine the annular workpiece.

Optionally, the first fixing body and the second fixing body are detachably connected with the fixing block, and the first fixing body and the second fixing body are detachably connected with the fixing block through screws.

Through adopting above-mentioned technical scheme, first fixed main part and the fixed main part of second have all realized being connected with dismantling of fixed block through the screw.

Optionally, the fixing block is further provided with a plurality of positioning pins, and the positioning pins are connected with the annular workpiece in an inserting manner.

Through adopting above-mentioned technical scheme, cyclic annular machined part when placing on the fixed block, can peg graft with the locating pin on the fixed block, and the locating pin can carry out preliminary location to cyclic annular machined part to make things convenient for first mounting and second mounting to the fixed of cyclic annular machined part.

Optionally, first fixed main part slides with the fixed block and is connected, and the direction of sliding is for being close to or keeping away from the direction of cyclic annular machined part, first butt board rotates with first fixed main part and is connected, one side that first butt board is close to cyclic annular machined part is connected with the pressure spring, the one side that first butt board was kept away from to the pressure spring is connected with first fixed main part, one side that cyclic annular machined part was kept away from to first butt board is connected with presses the depression bar, press the depression bar and pass first fixed main part, and slide with first fixed main part and be connected.

Through adopting above-mentioned technical scheme, when needs are fixed first cyclic annular portion, press the pressure lever at first, make the one end that first butt board is close to cyclic annular machined part move to the direction that is close to the pressure spring, slide first fixed main part to the direction that is close to cyclic annular machined part again for first butt board is located one side that first cyclic annular portion kept away from the fixed block, at this moment, press the spring and is compressed, loosen the pressure lever afterwards, the butt board is close to the direction that is close to first cyclic annular portion under the effect of pressing the spring, be used for fixed first cyclic annular portion.

Optionally, a sliding block is arranged on the first fixing main body, a sliding groove is formed in the fixing block, the opening direction of the sliding groove is consistent with the sliding direction of the first fixing main body, and the sliding block is arranged in the sliding groove and connected with the fixing block in a sliding manner.

Through adopting above-mentioned technical scheme, first fixed main part slides in the spout of slider on the fixed block, has realized the sliding connection of first fixed main part and fixed block.

Optionally, a sliding groove is formed in the fixed block, the second fixing body is connected with the fixed block in a sliding mode through being arranged in the sliding groove, the sliding direction is the direction close to or away from the annular workpiece, the accommodating groove is formed in the second fixing body, the second abutting plate is connected with the second fixing body in a sliding mode through being arranged in the accommodating groove, and the second abutting plate is used for fixing the annular workpiece.

By adopting the technical scheme, when the second annular part of the annular workpiece needs to be fixed, the second fixing body slides towards the direction close to the annular workpiece through the sliding groove, and then the second abutting plate slides on the second fixing body, so that the second abutting plate abuts against the second annular part of the annular workpiece and is used for fixing the annular workpiece.

Optionally, the fixed block is further provided with a driving assembly for driving the second fixed body to slide, the driving assembly comprises an air cylinder and a pushing block, the air cylinder is arranged on the fixed block, a piston rod of the air cylinder is connected with the pushing block, the pushing block is arranged in the accommodating groove and connected with the second fixed body in a sliding manner, one side of the pushing block facing the air cylinder is provided with a driving spring, one side of the driving spring away from the pushing block is connected with the second fixed body, one side of the pushing block close to the second butt plate is provided with an inclined surface, the inclined surface is connected with the second butt plate in a sliding manner and used for driving the second butt plate to slide towards the direction close to the annular workpiece, the second fixed body is further provided with a reset assembly for driving the second butt plate to return, the second fixed body is further provided with a clamping block, and the fixed block is provided with a clamping groove in the same sliding direction as the second fixed body, the clamping block is arranged in the clamping groove and connected with the fixing block in a sliding mode.

By adopting the technical scheme, when the second annular part of the annular workpiece is fixed, the cylinder is started, the driving rod is started to drive the push block to slide in the accommodating groove of the second fixing main body, the driving spring can be stretched along with the sliding of the push block, the stretched driving spring can drive the second fixing main body to have a driving force, so that the second fixing main body slides on the fixing block until the clamping block on the second fixing main body cannot slide on the fixing block, at the moment, the second fixing main body does not slide continuously, the push block continues to move, the second abutting plate can abut against the inclined plane on the push block, the push block drives the second abutting plate to slide in the accommodating groove, so that the second abutting plate slides in the direction close to the second annular part until the second abutting plate abuts against one side, far away from the fixing block, of the second annular part; when the second annular part needs to be machined, the driving assembly drives the second fixing body to return, and the second abutting plate also returns through the resetting assembly, so that the second fixing piece can automatically fix the second annular part.

Optionally, the reset assembly comprises a reset spring and a connecting rod, one side of the reset spring is connected with one end, away from the annular workpiece, of the second abutting plate, the other side of the reset spring is connected with the second fixing body, one end of the connecting rod is connected with the second fixing body, the other end of the connecting rod is connected with the second abutting plate in a sliding mode, the reset spring is sleeved on the connecting rod, a yielding groove is formed in the push block, and the connecting rod penetrates through the yielding groove and is connected with the push block in a sliding mode.

Through adopting above-mentioned technical scheme, when the ejector pad butt was on the second butt board, reset spring was stretched this moment, and when the ejector pad no longer all connect the second butt board, the second butt board passes through reset spring's effect return, and the connecting rod plays the effect of a direction, and the groove of stepping down on the ejector pad has realized the effect that resets of second butt board in addition.

Optionally, the fixed block is provided with a plurality of guide rods, the guide rods are connected with the fixed block through being arranged in the sliding grooves, the second fixing body is provided with guide grooves with the same number as the guide rods, and the guide rods are connected with the second fixing body in a sliding mode through being arranged in the guide grooves.

Through adopting above-mentioned technical scheme, when the fixed main part of second slided on the fixed block, the guide bar slided with the fixed main part of second through setting up in the guide way and is connected, has played the effect of direction, makes the fixed main part of second more stable that can slide simultaneously.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the first fixing part and the second fixing part fix the annular workpiece through pressing, so that the extrusion to the side face of the annular workpiece is reduced, the deformation of the annular workpiece when the annular workpiece is fixed is reduced, and the processing quality of the annular workpiece by a vertical lathe is improved;

2. the positioning pin can be used for preliminarily positioning the annular workpiece so as to facilitate the first fixing part and the second fixing part to fix the annular workpiece;

3. the second fixing member can automatically fix the second annular portion.

Drawings

Fig. 1 is a schematic view of an overall structure of a ring-shaped workpiece in the related art.

Fig. 2 is a schematic view of the overall structure of a workpiece pressing and fixing device according to embodiment 1 of the present application.

Fig. 3 is a schematic structural view of a connecting member of a workpiece pressing and fixing device according to embodiment 1 of the present application.

Fig. 4 is a schematic view of the overall structure of a workpiece pressing and fixing device according to embodiment 2 of the present application.

Fig. 5 is an enlarged view of a portion a in fig. 4.

Fig. 6 is a sectional view of a first fixing member of a workpiece pressing fixing apparatus according to embodiment 2 of the present application.

Fig. 7 is an enlarged view of a portion B in fig. 4.

Fig. 8 is a partial structural view of a workpiece pressing fixture according to embodiment 2 of the present application, showing a connection relationship between a second fixture and a driving unit.

Fig. 9 is a sectional view of a second fixing member of a workpiece pressing fixing device according to embodiment 2 of the present application.

Fig. 10 is a schematic view of the entire structure of a pusher of a workpiece pressing and fixing device according to embodiment 2 of the present application.

Description of reference numerals: 1. a chuck; 2. a fixed block; 21. an annular workpiece; 211. a first annular portion; 212. a second annular portion; 22. positioning pins; 23. a strip-shaped hole; 24. a chute; 25. a sliding groove; 26. a drive assembly; 261. a cylinder; 262. a drive rod; 263. a push block; 2631. a bevel; 2632. a drive spring; 2633. a yielding groove; 27. a guide bar; 3. a fixing mechanism; 31. a first fixing member; 311. a first stationary body; 3111. a slider; 3112. a pressing spring; 312. a first butt joint plate; 3121. a pressing lever; 3122. a pressing plate; 32. a second fixing member; 321. a second stationary body; 3211. accommodating grooves; 3212. a clamping block; 322. a second butt joint plate; 323. a reset assembly; 3231. a return spring; 3232. a connecting rod; 4. a connecting assembly; 41. connecting blocks; 411. anti-skid lines; 42. and connecting screws.

Detailed Description

The present application is described in further detail below with reference to the attached drawing figures.

Example 1

The embodiment of the application discloses a workpiece pressing and fixing device. Referring to fig. 1 and 2, the workpiece pressing and fixing device includes a chuck 1, and the chuck 1 is disposed on a machine body of a vertical lathe. The chuck 1 is further provided with a fixing block 2, the fixing block 2 adopted in the embodiment is circular, and the fixing block 2 is provided with a fixing mechanism 3 for fixing the annular workpiece 21.

The fixing mechanism 3 includes a plurality of first fixing members 31, the first fixing members 31 are used for fixing the first annular portion 211 of the annular workpiece 21, the number of the first fixing members 31 may be three in this embodiment, and the three first fixing members 31 are uniformly disposed on the fixing block 2. The first fixing member 31 includes a first fixing body 311 and a first abutting plate 312, and in this embodiment, the first fixing body 311 and the first abutting plate 312 are integrally formed. The first fixing body 311 is detachably connected to the fixing block 2 by a screw, and one side of the first abutting plate 312 close to the fixing block 2 abuts against the first annular portion 211.

The fixing mechanism 3 further includes a plurality of second fixing members 32, the second fixing members 32 are used for fixing the second annular portion 212 of the annular workpiece 21, the number of the second fixing members 32 may be multiple, in this embodiment, three second fixing members 32 are used, and the three second fixing members 32 are uniformly disposed on the fixing block 2. The second fixing member 32 includes a second fixing body 321 and a second abutting plate 322, and in this embodiment, the second fixing body 321 and the second abutting plate 322 are integrally formed. The second fixing body 321 is detachably connected to the fixing block 2 by a screw, and one side of the second abutting plate 322 close to the fixing block 2 abuts against the second annular portion 212.

The fixing block 2 is provided with a plurality of positioning pins 22, and the number of the positioning pins 22 is three in this embodiment. The annular workpiece 21 is provided with connecting holes with the same number as the positioning pins 22, and the positioning pins 22 are inserted into the annular workpiece 21 through the connecting holes. The positioning pins 22 can perform a preliminary positioning of the ring-shaped workpiece 21 so that the first fixing member 31 and the second fixing member 32 fix the ring-shaped workpiece 21. In addition, the positioning pin 22 can limit the rotation of the annular workpiece 21 in the circumferential direction, thereby reducing the rotation of the annular workpiece 21 in the circumferential direction when being processed and improving the processing precision of the annular workpiece 21.

Referring to fig. 2 and 3, the fixing block 2 is connected to the chuck 1 by the connection members 4, and the number of the connection members 4 used in this embodiment is three. The connecting assembly 4 comprises a connecting block 41 and a connecting screw 42, the connecting block 41 is placed on the chuck 1, one side of the connecting block 41 is abutted to the chuck 1, and the other side of the connecting block is connected with the fixing block 2. The fixed block 2 is provided with a strip-shaped hole 23, and the opening direction of the strip-shaped hole 23 is the radial direction of the fixed block 2. The connection screw 42 is screwed with the connection block 41 through the strip hole 23. The side of the connecting block 41 facing the chuck 1 is provided with anti-slip threads 411, and the anti-slip threads 411 increase the friction force between the connecting block 41 and the chuck 1.

The implementation principle of the workpiece pressing and fixing device in embodiment 1 of the application is as follows: when the annular workpiece 21 is fixed, firstly, the annular workpiece 21 is inserted into the positioning pin 22, so that the annular workpiece 21 can be preliminarily fixed on the fixing block 2, and when the first annular part 211 needs to be machined, the second annular part 212 can be fixed through the second fixing part 32, so that the first annular part 211 can be machined through a vertical lathe; when the second annular part 212 needs to be machined, the second fixing piece 32 is detached from the fixing block 2, the first fixing piece 31 is installed on the fixing block 2, and the first annular part 211 is fixed, so that the second annular part 212 can be machined by a vertical lathe.

Example 2

Referring to fig. 4 and 5, the present embodiment is different from embodiment 1 in that the first fixing body 311 is slidably connected to the fixing block 2, and the sliding direction is a radial direction of the fixing block 2. The fixed block 2 is provided with three sliding grooves 24, and the opening direction of the sliding grooves 24 is the same as the sliding direction of the first fixed main body 311. The first fixing body 311 is provided with a slider 3111, and the slider 3111 is slidably connected to the fixing block 2 by being disposed in the sliding groove 24.

Referring to fig. 6, a mounting groove is formed on the first fixing body 311, and the first abutting plate 312 is hinged to the first fixing body 311 by being disposed in the mounting groove. A pressing spring 3112 is bonded to one side of the first abutting plate 312 away from the fixed block 2, and the other side of the pressing spring 3112 is bonded to the first fixed body 311. A pressing rod 3121 is connected to one side of the first abutting plate 312, which is far away from the pressing spring 3112, through a screw, and a pressing plate 3122 is connected to one end of the pressing rod 3121, which is far away from the first abutting plate 312, through the first fixing body 311.

Referring to fig. 4 and 7, the fixed block 2 is provided with sliding grooves 25 having the same number as the second fixing bodies 321, and the second fixing bodies 321 are slidably connected to the fixed block 2 by being disposed in the sliding grooves 25.

The second fixing body 321 is further provided with two fixture blocks 3212 through screws, in this embodiment, the two fixture blocks 3212 are adopted, and the two fixture blocks 3212 are oppositely disposed on two sides of the second fixing block 2. The fixed block 2 is provided with a slot corresponding to the clamping block 3212, the opening direction of the slot is the sliding direction of the second fixing body 321, and the slot is communicated with the sliding groove 25.

Referring to fig. 8 and 9, the second fixing body 321 further has a receiving groove 3211. The second abutting plate 322 is slidably connected to the second fixing block 2 by being disposed in the accommodating groove 3211. The fixed block 2 is further provided with a driving assembly 26 for driving the second abutting plate 322 to slide, the driving assembly 26 includes a cylinder 261, a driving rod 262 and a pushing block 263, the cylinder 261 is connected with the fixed block 2 by being disposed in the sliding groove 25, and this embodiment adopts a screw connection. The piston rod of the cylinder 261 is connected to the driving rod 262 through a screw, one end of the driving rod 262 far away from the cylinder 261 is connected to the pushing block 263 through a screw, and the pushing block 263 is slidably connected to the second fixing body 321 by being disposed in the accommodating groove 3211. A driving spring 2632 is adhered to one side of the push block 263 facing the fixed block 2, and the other side of the driving spring 2632 is adhered to the inner wall of the second fixing body 321. A reset assembly 323 is further disposed in the second fixing body 321, and the reset assembly 323 is configured to drive the second abutting plate 322 to reset. The fixed block 2 is connected with a plurality of guide rods 27, four guide rods 27 in this embodiment, through screws. The second fixing body 321 is far away from one side of the second abutting plate 322, and a guide groove with the same number as the guide rods 27 is formed in the side, and the guide rods 27 are arranged in the guide groove and connected with the second fixing body 321 in a sliding mode. The reset assembly 323 includes a reset spring 3231 and a connecting rod 3232.

Referring to fig. 9 and 10, a slope 2631 is formed on a side of the pushing block 263 away from the driving rod 262, and an abdicating groove 2633 is formed on the pushing block 263. One end of the connecting rod 3232 is connected to the second fixing body 321 by a screw, and the other end of the connecting rod 3232 passes through the offset groove 2633 and is slidably connected to the second abutting plate 322. The return spring 3231 is sleeved on the connecting rod 3232, one side of the return spring 3231 is bonded on the inner wall of the second fixing body 321, and the other side is bonded with the second abutting plate 322.

The implementation principle of the workpiece pressing and fixing device in embodiment 2 of the application is as follows: when the annular workpiece 21 is fixed, the annular workpiece 21 is firstly inserted into the positioning pin 22, so that the annular workpiece 21 can be preliminarily fixed on the fixing block 2, when the first annular portion 211 needs to be machined, the cylinder 261 drives the push block 263 to move in a direction close to the second abutting plate 322 by starting the cylinder 261, then the driving spring 2632 is stretched, the driving spring 2632 can drive the second fixing body 321 to slide on the fixing block 2, and at this time, the inclined surface 2631 of the push block 263 is not abutted to the second abutting plate 322 yet. The latch 3212 on the second fixing body 321 also slides in the slot, when the latch 3212 slides to the end of the slot, the pushing block 263 is driven by the cylinder 261, the inclined surface 2631 of the pushing block 263 abuts against the second abutting plate 322 until the side of the second abutting plate 322 facing the fixing block 2 abuts against the second annular portion 212, at this time, the return spring 3231 and the connecting rod 3232 are located in the receding groove 2633 of the pushing block 263, and the return spring 3231 is in a stretching state.

When the second annular portion 212 does not need to be fixed, the cylinder 261 drives the pushing block 263 to return, the pushing block 263 does not abut against the second abutting plate 322, and the second abutting plate 322 returns under the action of the return spring 3231. In the process of returning the pushing block 263, the driving spring 2632 is in a compressed state from an extended state, and the pushing block 263 can drive the second fixing body 321 to return through the driving spring 2632.

When the first annular portion 211 needs to be fixed, the pressing plate 3122 is pressed first, so that one end of the first abutting plate 312 close to the first annular portion 211 moves in a direction away from the fixed block 2, at this time, the pressing spring 3112 is in a compressed state, and then the first fixing body 311 is pushed to approach the first annular portion 211, so that one side of the first abutting plate 312 facing the fixed block 2 abuts against one side of the first annular portion 211 away from the fixed block 2, the pressing spring 3112 presses the first annular portion 211 through the first abutting plate 312, and when the first annular portion 211 does not need to be pressed again, a worker can press the pressing plate 3122 to return the first fixing body 311.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A workpiece pressing and fixing device is characterized in that: including chuck (1), fixed block (2) and fixed establishment (3), fixed block (2) set up on chuck (1), fixed establishment (3) set up on fixed block (2), fixed establishment (3) include first mounting (31) and second mounting (32) of a plurality of quantity, place cyclic annular machined part (21) that remain to process on fixed block (2), one side butt of fixed block (2) is kept away from in first mounting (31) and first cyclic annular portion (211) of cyclic annular machined part (21), one side butt of fixed block (2) is kept away from in second mounting (32) and the cyclic annular portion (212) of second of cyclic annular machined part (21), first mounting (31) and second mounting (32) are used for fixed cyclic annular machined part (21).

2. A workpiece pressing and fixing device as defined in claim 1, wherein: the first fixing piece (31) comprises a first fixing body (311) and a first abutting plate (312) connected with the first fixing body (311), the first fixing body (311) is detachably/slidably connected with the fixing block (2), and the first abutting plate (312) abuts against one side, far away from the fixing block (2), of the first annular part (211); the second fixing piece (32) comprises a second fixing body (321) and a second abutting plate (322) connected with the second fixing body (321), the second fixing body (321) is detachably/slidably connected with the fixing block (2), and the second abutting plate (322) and the second annular portion (212) are abutted to one side of the fixing block (2) away from the fixing block.

3. A workpiece pressing and fixing device as defined in claim 2, wherein: the first fixing body (311) and the second fixing body (321) are detachably connected with the fixing block (2), and the first fixing body (311) and the second fixing body (321) are detachably connected with the fixing block (2) through screws.

4. A workpiece pressing and fixing device as defined in claim 1, wherein: the fixed block (2) is also provided with a plurality of positioning pins (22), and the positioning pins (22) are inserted into the annular workpiece (21).

5. A workpiece pressing and fixing device as defined in claim 2, wherein: first fixed main part (311) and fixed block (2) are slided and are connected, and the direction of sliding is for being close to or keeping away from the direction of cyclic annular machined part (21), first butt plate (312) rotate with first fixed main part (311) and are connected, one side that first butt plate (312) is close to cyclic annular machined part (21) is connected with presses spring (3112), press spring (3112) keep away from one side of first butt plate (312) and be connected with first fixed main part (311), one side that cyclic annular machined part (21) was kept away from in first butt plate (312) is connected with and presses depression bar (3121), press the one end that first butt plate (312) were kept away from in depression bar (3121) and pass first fixed main part (311), and slide with first fixed main part (311) and be connected.

6. A workpiece pressing and fixing device as defined in claim 5, wherein: the sliding block (3111) is arranged on the first fixing main body (311), the sliding groove (24) is formed in the fixing block (2), the forming direction of the sliding groove (24) is consistent with the sliding direction of the first fixing main body (311), and the sliding block (3111) is arranged in the sliding groove (24) and connected with the fixing block (2) in a sliding mode.

7. A workpiece pressing and fixing device as defined in claim 2, wherein: the fixed block (2) is provided with a sliding groove (25), the second fixing body (321) is connected with the fixed block (2) in a sliding mode through being arranged in the sliding groove (25), the sliding direction is the direction close to or far away from the annular workpiece (21), the second fixing body (321) is provided with an accommodating groove (3211), the second butt joint plate (322) is connected with the second fixing body (321) in a sliding mode through being arranged in the accommodating groove (3211), and the second butt joint plate (322) is used for fixing the annular workpiece (21).

8. A workpiece pressing and fixing device as defined in claim 7, wherein: the fixed block (2) is further provided with a driving component (26) for driving the second fixed body (321) to slide, the driving component (26) comprises a cylinder (261) and a push block (263), the cylinder (261) is arranged on the fixed block (2), the cylinder (261) is connected with the push block (263) through a driving rod (262), the push block (263) is arranged in the accommodating groove (3211) and is connected with the second fixed body (321) in a sliding manner, one side of the push block (263) facing the cylinder (261) is provided with a driving spring (2632), one side of the driving spring (2632) far away from the push block (263) is connected with the second fixed body (321), one side of the push block (263) close to the second abutting plate (322) is provided with an inclined plane (2631), the inclined plane (2631) is connected with the second abutting plate (322) in a sliding manner and is used for driving the second abutting plate (322) to slide towards the direction close to the annular workpiece (21), still be provided with reset assembly (323) that are used for driving second butt joint board (322) return on the fixed main part of second (321), still be provided with fixture block (3212) on the fixed main part of second (321), set up the draw-in groove unanimous with the sliding direction of the fixed main part of second (321) on fixed block (2), fixture block (3212) are through setting up in the draw-in groove and with fixed block (2) connection of sliding.

9. A workpiece pressing and fixing device as defined in claim 8, wherein: reset assembly (323) includes reset spring (3231) and connecting rod (3232), the one end that cyclic annular machined part (21) was kept away from with second butt joint board (322) in one side of reset spring (3231) is connected, and the opposite side is connected with second fixed main part (321), the one end and the second fixed main part (321) of connecting rod (3232) are connected, and the other end slides with second butt joint board (322) and is connected, just reset spring (3231) cover is established on connecting rod (3232), set up on ejector pad (263) and abdicate groove (2633), connecting rod (3232) pass and abdicate groove (2633) and slide with ejector pad (263) and be connected.

10. A workpiece pressing and fixing device as defined in claim 7, wherein: be provided with guide bar (27) of a plurality of quantity on fixed block (2), guide bar (27) are connected with fixed block (2) through setting up in sliding tray (25), set up the guide way unanimous with guide bar (27) quantity on the fixed main part of second (321), guide bar (27) are through setting up in the guide way and with the fixed main part of second (321) connection of sliding.