CN117816834A - A punching device for annular workpiece - Google Patents

Abstract

The invention discloses a punching device for annular workpieces, which relates to the technical field of punching and comprises a U-shaped frame, wherein a clamping block is fixedly connected to the upper surface of the U-shaped frame, a stamping part is rotatably connected to the surface of the clamping block, supporting plates are fixedly connected to two sides of the outer surface of the U-shaped frame, a connecting seat is fixedly connected to the surface of the U-shaped frame, a side plate is fixedly connected to the lower surface of the connecting seat, the outer surface of the U-shaped frame is fixedly connected to the side plate, and a lantern ring is fixedly connected to the upper surface of the connecting seat. This punching device of annular work piece makes the pressing block drive the link plate and slide on the spout surface through the staff pushing down the briquetting to the spring that connects the board bottom causes the extrusion, makes the spring produce deformation shrink, increases the stability when pushing down the briquetting, and the link plate angle appears the slope when preventing to push down, causes the opening size difference of holder both sides, causes work piece fixed position skew, influences the punching effect.

Description

A punching device for annular workpiece

Technical Field

The invention relates to the technical field of punching, in particular to a punching device for an annular workpiece.

Background technique

With the development of high-tech, the application fields of punching machines are becoming more and more extensive, from the initial defense and aerospace fields to machinery, medical and other fields; according to the shape of the processed materials, punching machines are divided into flat punching machines, round tube punching machines, square tube punching machines and U-shaped steel punching machines.

The punching machine is a mechanical device that, after the raw materials are installed, the punching die acts on the material under the drive of the power mechanism to complete the punching. The punching machine can perform operations such as sheet processing, stamping, molding, embossing, etc. to force metal into the die.

At present, when the existing punching device punches a ring-shaped workpiece, the workpiece is prone to displacement, resulting in deviations in the blanking of the workpiece, affecting the precision of the workpiece processing. In addition, depending on the structure of the workpiece, holes of different sizes need to be opened. If the workpiece is not fixed tightly, it will cause the workpiece to fall on the supporting platform and collide with waste materials. The workpiece is easily scratched or even deformed.

Summary of the invention

To achieve the above purpose, the present invention is implemented through the following technical solutions: a punching device for an annular workpiece, comprising a U-shaped frame, a clamping block is fixedly connected to the upper surface of the U-shaped frame, a stamping piece is rotatably connected to the surface of the clamping block, support plates are fixedly connected to both sides of the outer surface of the U-shaped frame, a connecting seat is fixedly connected to the surface of the U-shaped frame, a side plate is fixedly connected to the lower surface of the connecting seat, the side plate is fixedly connected to the outer surface of the U-shaped frame of the connecting seat, a collar is fixedly connected to the upper surface of the connecting seat, and a rotating rod is rotatably connected to the inner surface of the collar;

The punching device of the annular workpiece also includes:

A punching head, which is fixedly connected to the surface of the stamping part, comprises a through block, an adjusting part is slidably connected to the surface of the through block, a sleeve is provided on the surface of the adjusting part, a top is fixedly connected to the surface of the sleeve, a pushing pad is provided on the inner surface of the top, and the pushing pad is extruded and adapted to the adjusting part; the stamping part drives the punching head to descend to punch the annular workpiece. When holes of different sizes need to be opened on the annular workpiece, the staff pulls the adjusting part to cause it to be extruded with the pushing pad to change the shape of the top.

The operating table is fixedly connected to the surface of the rotating rod, and the operating table includes a bottom plate, and the outer surface of the bottom plate is fixedly connected with slide grooves on both sides, and the surface of the slide groove is slidably connected with a pressing block, and two pressing blocks are provided, and a connecting plate is fixedly connected between the opposite surfaces of the two pressing blocks. The staff presses down the pressing block to make the pressing block drive the connecting plate to slide down on the surface of the slide groove, and squeeze the spring at the bottom of the connecting plate, so that the spring is deformed and contracted, increasing the stability of the pressing block when it is pressed down, and preventing the connecting plate from tilting when it is pressed down, resulting in different sizes of openings on both sides of the clamp, causing the fixed position of the workpiece to shift, affecting the punching effect.

Preferably, a fixing block is fixedly connected to the lower surface of the connecting plate, and two groups of the fixing blocks are provided. The two groups of the fixing blocks are symmetrical with the rotating rod as the center, and a spring is fixedly connected between the opposite surfaces of the fixing blocks.

Preferably, a positioning ring is fixedly connected to the upper surface of the bottom plate, and a clamp is fixedly connected to the inner surface of the positioning ring. The clamp is provided in two groups, and the two groups of clamps penetrate the connecting plate and extend to the surface of the placement plate. The staff presses down the pressing block to make the connecting plate slide on the surface of the clamp, and squeezes the slide seat to push it upward, so that the push rod pushes upward, separates the clamps on both sides, and then places the annular workpiece between the two opened clamps, so as to clamp and fix the annular workpiece, and avoid the workpiece being loosely fixed, causing the workpiece to fall on the bearing platform and collide with waste materials, and the workpiece is easily scratched and deformed.

Preferably, the punching part includes a rotating shaft, the outer surface of the rotating shaft is rotatably connected with a control rod, the control rod is fixedly connected to the outer surface of the block, and the rotating shaft is rotatably connected between opposite surfaces of the block. The staff rotates the control rod to make the rotating shaft drive the rotating piece to rotate, and drive the connecting shaft and the connecting block to adjust the position, so that the punching head can adjust the punching position.

Preferably, rotating plates are rotatably connected to both sides of the outer surface of the rotating shaft, a connecting plate is fixedly connected to the surface of the rotating plate, a connecting shaft is fixedly connected to the surface of the connecting plate, a connecting block is fixedly connected to the outer surface of the connecting shaft, and the connecting block is fixedly connected to the surface of the through block.

Preferably, the clamping member comprises a push rod, the outer surface of which is slidably connected to a clamping block, the outer surface of which is sleeved with a slip ring, the outer surface of which is frictionally connected to a base, the base is slidably connected to the inner surface of the placement plate, and the lower surface of the base is fixedly connected to a sliding seat. When the push rod is lifted upward, the slip rings on both sides of the clamping block are squeezed and fit with the base, and since the base is arranged inside the placement plate, the slip rings are pushed and deformed, which can improve the stability of the clamping block when it slides outward.

Preferably, the sliding seat includes a bottom ring, the bottom ring is fixedly connected to the surface of the positioning ring, the surface of the bottom ring is fixedly connected to a connecting ring, the surface of the connecting ring is slidably connected to a threaded rod, and the outer surface of the threaded rod is slidably connected to an outer ring.

Preferably, the upper surface of the outer ring is slidably connected with a top block, the outer surface of the top block is slidably connected with a slide bar, the surface of the slide bar is fixedly connected with a short block, the surface of the short block is fixedly connected with a fixing ring, and the fixing ring is slidably connected to the inner surface of the connecting plate. The pressing block drives the connecting plate to slide on the surface of the slide seat. Since the fixing ring is connected to the connecting plate, the fixing ring slides down on the surface of the slide bar when pressed down, and presses the outer ring down, so that the top block slides upward and pushes out, and the top rod is pushed upward, so that the clamping block slides to both sides and presents an open shape, which is convenient for fixing the annular workpiece.

Preferably, the adjustment member includes an extension rod, the surface of the extension rod is fixedly connected to a reaming shaft, the outer surface of the reaming shaft is rotatably fixedly connected to hinge rods on both sides, the surface of the hinge rod is rotatably connected to a slider, and the surface of the slider is slidably connected to a flap.

Preferably, a limit plate is sleeved on the outer surface of the flap, a sliding shaft is slidably connected to the surface of the limit plate, and the limit plate is fixedly connected to the surface of the top head. When punching holes, since the annular workpiece needs to be punched with holes of different sizes, the operator needs to manually pull the flap to slide on the surface of the limit plate when adjusting the hole size. When the flap is pressed downward, the sliding shaft is driven to slide on the surface of the limit plate. At the same time, the slider drives the extension rod and the hole expansion shaft to slide downward to squeeze the pushing pad, so that the diameter of the top head increases when the pushing pad protrudes outward, thereby achieving the effect of adjusting the hole size during punching.

The present invention provides a punching device for an annular workpiece, which has the following beneficial effects:

1. The punching device of the annular workpiece is configured such that the worker presses down the pressing block so that the pressing block drives the connecting plate to slide down on the surface of the slide groove, and squeezes the spring at the bottom of the connecting plate, causing the spring to deform and shrink, thereby increasing the stability of the pressing block when it is pressed down, and preventing the connecting plate from tilting when it is pressed down, resulting in different sizes of openings on both sides of the clamping part, causing the fixed position of the workpiece to shift, and affecting the punching effect.

Second, the punching device of the annular workpiece drives the punching head to descend to punch the annular workpiece through the punching part. When holes of different sizes need to be opened in the annular workpiece, the staff pulls the adjusting part to squeeze it with the pushing pad to change the shape of the head.

3. When the punching device of the annular workpiece is pushed upward by the push rod, the slip rings on both sides of the clamping block are squeezed and fit with the base. Since the base is arranged inside the placement plate, the slip rings are pushed and deformed, which can improve the stability of the clamping block when it slides outward.

Fourth, the punching device of the annular workpiece drives the connecting plate to be pressed down and slide on the surface of the slide seat through the pressing block. Since the fixing ring is connected to the connecting plate, the fixing ring slides down on the surface of the slide rod when pressed down, and presses the outer ring down, so that the top block slides upward and pushes out, and the top rod is pushed upward, so that the clamping block slides to both sides and presents an open shape, which is convenient for fixing the annular workpiece.

5. The punching device of the annular workpiece, when punching, because the annular workpiece needs to be punched with holes of different sizes, when adjusting the size of the hole, the operator needs to manually pull the flap to make the flap slide on the surface of the limit plate, and when the flap is pressed downward, it drives the sliding shaft to slide on the surface of the limit plate, and at the same time, the slider drives the extension rod and the expansion shaft to slide downward to squeeze the pushing pad, so that the diameter of the head increases when the pushing pad protrudes outward, thereby achieving the effect of adjusting the size of the hole during punching.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the external structure of a punching device for an annular workpiece according to the present invention;

FIG2 is a bottom view of the structure of the side panel of the present invention;

FIG3 is a schematic diagram of the connection structure between the operating table and the connecting base of the present invention;

FIG4 is a schematic diagram of the structure of the operating table of the present invention;

FIG5 is a schematic diagram of the cross-sectional structure of the clamping member of the present invention;

FIG6 is a schematic diagram of the slide structure of the present invention;

FIG7 is a schematic diagram of the structure of a stamping part according to the present invention;

FIG. 8 is a schematic diagram of the structure of the adjusting member of the present invention.

In the figure: 1, card block; 2, U-shaped frame; 3, stamping part; 31, connecting block; 32, connecting shaft; 33, connecting plate; 34, rotating shaft; 35, control rod; 36, rotating piece; 4, punching head; 41, sleeve; 42, top head; 43, adjusting part; 431, limit plate; 432, hinge rod; 433, reaming shaft; 434, sliding shaft; 435, flap; 436, slider; 437, extension rod; 44, penetration block; 45, pushing pad; 5, operating table; 51, clamping part; 511, clamping block; 51 2. Push rod; 513. Slip ring; 514. Base; 515. Sliding seat; 5151. Push block; 5152. Sliding rod; 5153. Fixed ring; 5154. Short block; 5155. Outer ring; 5156. Threaded rod; 5157. Connecting ring; 5158. Bottom ring; 52. Placement plate; 53. Pressing block; 54. Slide groove; 55. Positioning ring; 56. Bottom plate; 57. Connecting plate; 58. Fixed block; 59. Spring; 6. Connecting seat; 7. Support plate; 8. Rotating rod; 9. Side plate; 10. Ring.

Detailed ways

The first embodiment, as shown in Figures 1, 2 and 7, the present invention provides a technical solution: a punching device for an annular workpiece, comprising a U-shaped frame 2, a clamping block 1 is fixedly connected to the upper surface of the U-shaped frame 2, a stamping part 3 is rotatably connected to the surface of the clamping block 1, support plates 7 are fixedly connected to both sides of the outer surface of the U-shaped frame 2, a connecting seat 6 is fixedly connected to the surface of the U-shaped frame 2, a side plate 9 is fixedly connected to the lower surface of the connecting seat 6, the side plate 9 is fixed to the outer surface of the connecting seat U-shaped frame 2, a collar 10 is fixedly connected to the upper surface of the connecting seat 6, and a rotating rod 8 is rotatably connected to the inner surface of the collar 10.

The punching part 3 includes a rotating shaft 34, the outer surface of which is rotatably connected to a control rod 35, which is fixedly connected to the outer surface of the block 1, and the rotating shaft 34 is rotatably connected between opposite surfaces of the block 1. The staff rotates the control rod 35 to make the rotating shaft 34 drive the rotating piece 36 to rotate, and drive the connecting shaft 32 and the connecting block 31 to adjust their positions, so that the punching head 4 can adjust the punching position.

Rotating pieces 36 are rotatably connected to both sides of the outer surface of the rotating shaft 34, the surface of the rotating piece 36 is fixedly connected to the connecting plate 33, the surface of the connecting plate 33 is fixedly connected to the connecting shaft 32, the outer surface of the connecting shaft 32 is fixedly connected to the connecting block 31, and the connecting block 31 is fixedly connected to the surface of the penetration block 44.

In the second embodiment, as shown in Fig. 3 to Fig. 6, the operating table 5 is fixedly connected to the surface of the rotating rod 8, and the operating table 5 includes a bottom plate 56, and the outer surface of the bottom plate 56 is fixedly connected with a slide groove 54 on both sides, and the surface of the slide groove 54 is slidably connected with a pressing block 53, and two pressing blocks 53 are provided, and a connecting plate 57 is fixedly connected between the opposite surfaces of the two pressing blocks 53. When the staff presses down the pressing block 53, the pressing block 53 drives the connecting plate 57 to slide down on the surface of the slide groove 54, and squeezes the spring at the bottom of the connecting plate 57, so that the spring is deformed and contracted, and the stability of the pressing block 53 when it is pressed down is increased, and the angle of the connecting plate 57 is prevented from being tilted when it is pressed down, resulting in different sizes of openings on both sides of the clamping member 51, causing the fixed position of the workpiece to shift, and affecting the punching effect.

A fixing block 58 is fixedly connected to the lower surface of the connecting plate 57 . There are two groups of fixing blocks 58 . The two groups of fixing blocks 58 are symmetrical with the rotating rod 8 as the center. A spring 59 is fixedly connected between the opposite surfaces of the fixing blocks 58 .

The upper surface of the bottom plate 56 is fixedly connected with a positioning ring 55, and the inner surface of the positioning ring 55 is fixedly connected with a clamping member 51. There are two groups of clamping members 51, and the two groups of clamping members 51 penetrate the connecting plate 57 and extend to the surface of the placement plate 52. The staff presses down the pressing block 53 to make the connecting plate 57 slide on the surface of the clamping member 51, and squeezes the slide seat 515 to push it upward, so that the push rod 512 pushes upward, separates the clamping blocks 511 on both sides, and then places the annular workpiece between the two opened clamping blocks 511, so as to clamp and fix the annular workpiece, and avoid the workpiece from falling on the bearing platform and colliding with waste materials due to loose fixation of the workpiece, and the workpiece is easily scratched and deformed.

The clamping member 51 includes a push rod 512, the outer surface of which is slidably connected to a clamping block 511, the outer surface of which is sleeved with a slip ring 513, the outer surface of which is frictionally connected to a base 514, the base 514 is slidably connected to the inner surface of the placement plate 52, and the lower surface of the base 514 is fixedly connected to a slide seat 515. When the push rod 512 is pushed upward, the slip rings 513 on both sides of the clamping block 511 are squeezed and fit with the base 514. Since the base 514 is arranged inside the placement plate 52, the slip rings 513 are pushed and deformed, which can improve the stability of the clamping block 511 when it slides outward.

The sliding seat 515 includes a bottom ring 5158, which is fixedly connected to the surface of the positioning ring 55, and a connecting ring 5157 is fixedly connected to the surface of the bottom ring 5158, and a threaded rod 5156 is slidably connected to the surface of the connecting ring 5157, and an outer ring 5155 is slidably connected to the outer surface of the threaded rod 5156.

The upper surface of the outer ring 5155 is slidably connected with a top block 5151, the outer surface of the top block 5151 is slidably connected with a slide bar 5152, the surface of the slide bar 5152 is fixedly connected with a short block 5154, the surface of the short block 5154 is fixedly connected with a fixing ring 5153, and the fixing ring 5153 is slidably connected to the inner surface of the connecting plate 57. The pressing block 53 drives the connecting plate 57 to press down and slide on the surface of the slide seat 515. Since the fixing ring 5153 is connected to the connecting plate 57, when pressing down, the fixing ring 5153 slides down on the surface of the slide bar 5152 and presses the outer ring 5155 downward, so that the top block 5151 slides upward and pushes out, and the top rod 512 is pushed upward, so that the clamping block 511 slides to both sides, presenting an open shape, which is convenient for fixing the annular workpiece.

The third embodiment, as shown in Figures 7 and 8, includes a punch head 4, which is fixedly connected to the surface of the stamping part 3. The punch head 4 includes a through block 44, and the surface of the through block 44 is slidably connected with an adjusting part 43. The surface of the adjusting part 43 is sleeved with a sleeve 41, and the surface of the sleeve 41 is fixedly connected with a plug 42. The inner surface of the plug 42 is provided with a pushing pad 45, and the pushing pad 45 is extruded and adapted with the adjusting part 43; the stamping part 3 drives the punch head 4 to descend to punch the annular workpiece. When it is necessary to open holes of different sizes in the annular workpiece, the staff pulls the adjusting part to cause it to be extruded with the pushing pad 45 to change the shape of the plug 42.

The adjusting member 43 includes an extension rod 437, the surface of which is fixedly connected to the reaming shaft 433, the outer surfaces of which are rotatably fixedly connected to hinge rods 432 on both sides, the surface of the hinge rod 432 is rotatably connected to a slider 436, and the surface of the slider 436 is slidably connected to a flap 435.

The outer surface of the flap 435 is sleeved with a limit plate 431, and the surface of the limit plate 431 is slidably connected with a sliding shaft 434, and the limit plate 431 is fixedly connected to the surface of the head 42. When punching holes, since the annular workpiece needs to be punched with holes of different sizes, the operator needs to manually pull the flap 435 to slide on the surface of the limit plate 431 when adjusting the hole size. When the flap 435 is pressed downward, the sliding shaft 434 is driven to slide on the surface of the limit plate 431. At the same time, the slider 436 drives the extension rod 437 and the hole expansion shaft 433 to slide downward to squeeze the pushing pad 45, so that the diameter of the head 42 increases when the pushing pad 45 protrudes outward, so as to achieve the effect of adjusting the hole size during punching.

When in use, the staff rotates the control rod 35 to make the rotating shaft 34 drive the rotating plate 36 to rotate, and drive the connecting shaft 32 and the connecting block 31 to adjust their positions, so that the punching head 4 can adjust the punching position.

The staff presses down the pressing block 53 so that the pressing block 53 drives the connecting plate 57 to slide down on the surface of the slide groove 54, and squeezes the spring at the bottom of the connecting plate 57, causing the spring to deform and shrink, thereby increasing the stability of the pressing block 53 when it is pressed down, and preventing the connecting plate 57 from tilting when it is pressed down, resulting in different sizes of openings on both sides of the clamping member 51, causing the fixed position of the workpiece to shift, affecting the punching effect.

The staff presses down the pressing block 53 to make the connecting plate 57 slide on the surface of the clamping part 51, and squeezes the sliding seat 515 to push it upward, so as to push the push rod 512 upward, separate the clamping blocks 511 on both sides, and then place the annular workpiece between the two opened clamping blocks 511, so as to clamp and fix the annular workpiece, and avoid the workpiece from falling on the supporting platform and colliding with waste materials due to loose fixation of the workpiece, which may cause the workpiece to be easily scratched and deformed.

When the push rod 512 is pushed upward, the slip rings 513 on both sides of the clamp block 511 are squeezed and fit with the base 514. Since the base 514 is arranged inside the placement plate 52, the slip rings 513 are pushed and deformed, which can improve the stability of the clamp block 511 when it slides outward.

The pressing block 53 drives the connecting plate 57 to be pressed down and slide on the surface of the sliding seat 515. Since the fixing ring 5153 is connected to the connecting plate 57, when pressed down, the fixing ring 5153 slides down on the surface of the sliding rod 5152 and presses the outer ring 5155 downward, so that the top block 5151 slides upward and pushes out, and the top rod 512 is pushed upward, so that the clamping block 511 slides to both sides, presenting an open shape, which is convenient for fixing the annular workpiece.

The punching part 3 drives the punching head 4 to descend to punch the annular workpiece. When holes of different sizes need to be opened in the annular workpiece, the staff pulls the adjusting part to squeeze it with the pushing pad 45 to change the shape of the plug 42.

When punching holes, since the annular workpiece needs to be punched in different sizes, the operator needs to manually pull the flap 435 to adjust the size of the hole so that the flap 435 slides on the surface of the limit plate 431. When the flap 435 is pressed downward, it drives the sliding shaft 434 to slide on the surface of the limit plate 431. At the same time, the slider 436 drives the extension rod 437 and the expansion shaft 433 to slide downward to squeeze the pushing pad 45, so that the diameter of the push head 42 increases when the pushing pad 45 protrudes outward, thereby achieving the effect of adjusting the size of the hole during punching.

Claims (10)

1. A punching device for an annular workpiece, comprising: the novel stamping die comprises a U-shaped frame (2), wherein a clamping block (1) is fixedly connected to the upper surface of the U-shaped frame (2), a stamping part (3) is rotationally connected to the surface of the clamping block (1), supporting plates (7) are fixedly connected to two sides of the outer surface of the U-shaped frame (2), a connecting seat (6) is fixedly connected to the surface of the U-shaped frame (2), a side plate (9) is fixedly connected to the lower surface of the connecting seat (6), a lantern ring (10) is fixedly connected to the outer surface of the U-shaped frame (2) of the side plate (9), and a rotating rod (8) is rotationally connected to the inner surface of the lantern ring (10);

the punching device of the annular workpiece further includes:

the stamping head (4), stamping head (4) is fixedly connected to the surface of stamping part (3), stamping head (4) is including running through piece (44), the surface sliding connection who runs through piece (44) has adjusting part (43), the surface cover of adjusting part (43) is equipped with cover shell (41), the surface fixedly connected with top (42) of cover shell (41), the internal surface of top (42) is provided with and pushes away pad (45), push away pad (45) and adjusting part (43) extrusion adaptation;

the operation panel (5), operation panel (5) fixed connection is on the surface of bull stick (8), operation panel (5) include bottom plate (56), surface both sides fixedly connected with spout (54) of bottom plate (56), the surface sliding connection of spout (54) has pressing block (53), pressing block (53) are provided with two, two fixedly connected with link plate (57) between the opposite face of pressing block (53).

2. A punching device for an annular workpiece according to claim 1, wherein: the lower surface of the connecting plate (57) is fixedly connected with fixing blocks (58), the fixing blocks (58) are provided with two groups, the two groups of fixing blocks (58) are symmetrical with each other by taking the rotating rod (8) as a center, and springs (59) are fixedly connected between opposite surfaces of the fixing blocks (58).

3. A punching device for an annular workpiece according to claim 2, characterized in that: the upper surface fixedly connected with holding ring (55) of bottom plate (56), the internal surface fixedly connected with clamping piece (51) of holding ring (55), clamping piece (51) are provided with two sets of, and two sets of clamping piece (51) run through connection board (57) and extend to the surface of placing board (52).

4. A punching device for an annular workpiece according to claim 1, wherein: the stamping part (3) comprises a rotating shaft (34), a control rod (35) is rotatably connected to the outer surface of the rotating shaft (34), the control rod (35) is fixedly connected to the outer surface of the clamping block (1), and the rotating shaft (34) is rotatably connected between opposite surfaces of the clamping block (1).

5. A punching device for an annular workpiece as claimed in claim 4, wherein: the rotary table is characterized in that rotary plates (36) are rotatably connected to two sides of the outer surface of the rotary shaft (34), a connecting plate (33) is fixedly connected to the surface of the rotary plates (36), a connecting shaft (32) is fixedly connected to the surface of the connecting plate (33), a connecting block (31) is fixedly connected to the outer surface of the connecting shaft (32), and the connecting block (31) is fixedly connected to the surface of the penetrating block (44).

6. A punching device for an annular workpiece according to claim 3, characterized in that: clamping piece (51) include ejector pin (512), the surface sliding connection of ejector pin (512) has clamp splice (511), the surface cover of clamp splice (511) is equipped with sliding ring (513), the surface friction of sliding ring (513) is connected with base (514), base (514) sliding connection is at the internal surface of placing board (52), the lower surface fixedly connected with slide (515) of base (514).

7. A punching device for an annular workpiece as defined in claim 6, wherein: the sliding seat (515) comprises a bottom ring (5158), the bottom ring (5158) is fixedly connected to the surface of the positioning ring (55), a connecting ring (5157) is fixedly connected to the surface of the bottom ring (5158), a threaded rod (5156) is slidingly connected to the surface of the connecting ring (5157), and an outer ring (5155) is slidingly connected to the outer surface of the threaded rod (5156).

8. A punching device for an annular workpiece as claimed in claim 7, wherein: the upper surface sliding connection of outer loop (5155) has kicking block (5151), the surface sliding connection of kicking block (5151) has slide bar (5152), the surface fixedly connected with short piece (5154) of slide bar (5152), the surface fixedly connected with solid fixed ring (5153) of short piece (5154), solid fixed ring (5153) sliding connection is at the internal surface of link plate (57).

9. A punching device for an annular workpiece as claimed in claim 4, wherein: the adjusting piece (43) comprises an extension rod (437), a reaming shaft (433) is fixedly connected to the surface of the extension rod (437), a hinge rod (432) is fixedly connected to two sides of the outer surface of the reaming shaft (433) in a rotating mode, a sliding block (436) is connected to the surface of the hinge rod (432) in a rotating mode, and a turning plate (435) is connected to the surface of the sliding block (436) in a sliding mode.

10. A punching device for an annular workpiece according to claim 9, wherein: the outer surface of turning plate (435) is equipped with limiting plate (431) in the cover, the surface sliding connection of limiting plate (431) has slide shaft (434), limiting plate (431) fixed connection is at the surface of top (42).