Forging device for metal forgings

Abstract

The invention relates to the technical field of metal forging, in particular to a metal forging forging device which comprises a base and a die forging mechanism fixedly arranged at the top of the base, a first driving mechanism is arranged on one side of the base, a ventilation pipe is rotatably mounted in a mounting seat, and a rotating cylinder is fixedly mounted at the bottom of the ventilation pipe; an L-shaped hollow pipe is arranged on one side of the rotary drum, scrapers are fixedly installed at the bottom of the L-shaped hollow pipe and the side, away from the rotary drum, of the L-shaped hollow pipe, and a plurality of through holes are formed in the outer side of the L-shaped hollow pipe. The method has the beneficial effects that after the cavity of the round magnesium alloy forge piece die is vacuumized, the cavity is filled with inert gas, the oxygen content in the cavity of the round magnesium alloy forge piece die is reduced, and the combustion chain reaction is destroyed; and the magnesium chips cannot burn even if meeting sparks, so that the safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal forging, in particular to a forging device for metal forgings. Background Art

[0002] Magnesium alloy forgings are magnesium alloy products processed through forging technology. They have the characteristics of light weight, high strength, good shock absorption and electromagnetic shielding properties. They are widely used in aerospace, automotive industry, electronic equipment and other fields.

[0003] For some simple circular magnesium alloy forgings (such as steering columns), die forging is usually used. First, suitable materials are selected, the die is preheated and lubricated, and then the blank is heated. The heated blank is placed in the die and pressed, and finally the finished magnesium alloy forging is obtained.

[0004] Due to the low hardness of magnesium alloys, they are easily sheared or scraped by the die during high-pressure forging, generating debris. At the same time, the die will wear out after continuous use. After the die coating peels off, the base steel will directly contact the magnesium, which will also accelerate the generation of debris. Therefore, after removing the finished magnesium alloy forging, it is usually necessary to clean the magnesium chips and other metal debris remaining in the cavity. In the prior art, the magnesium chips adhering to the inside of the mold cavity are scraped and cleaned by manually holding a scraper. However, magnesium chips themselves are flammable, especially magnesium chips in a fine powder state. When workers clean the magnesium chips inside the cavity, the friction between the scraper and the die generates local high temperatures. The fine magnesium powder will form an explosive mixture in the air, so workers need to be extra careful when cleaning. This leads to the problem of slow cleaning of magnesium chips, which in turn affects the processing efficiency of the finished magnesium alloy forgings. To this end, we propose a forging device for metal forgings. Summary of the Invention

[0005] The object of the present invention is to provide a forging device for metal forgings to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: A forging device for metal forgings, including a base, a die forging mechanism fixedly arranged on the top of the base, a driving mechanism one arranged on one side of the base, an installation seat arranged in the driving mechanism one, a ventilation pipe rotatably installed inside the installation seat, a ventilation mechanism arranged on the top of the ventilation pipe, a driving mechanism two arranged inside the installation seat, a sealing mechanism arranged at the bottom of the installation seat, a rotating cylinder fixedly installed at the bottom of the ventilation pipe, an L-shaped hollow pipe arranged on one side of the rotating cylinder, scrapers fixedly installed at the bottom and the side far from the rotating cylinder of the L-shaped hollow pipe, a displacement mechanism and a fixing mechanism arranged inside the L-shaped hollow pipe, a plurality of through holes arranged on the outer side of the L-shaped hollow pipe, a hose communicated with one end of the L-shaped hollow pipe close to the rotating cylinder, and the top of the hose is communicated with the ventilation pipe.

[0007] Preferably, the driving mechanism one includes a bracket, a cylinder one, two cylinder twos and a support plate. The bracket is fixedly installed on one side of the base, the cylinder one is fixedly installed inside the bracket, the support plate is fixedly installed at the top of the telescopic shaft of the cylinder one, and the two cylinder twos are respectively symmetrically fixedly installed at both ends of the top of the support plate. The sides of the telescopic shafts of the two cylinder twos far from the support plate are fixedly connected with the installation seat.

[0008] Preferably, the ventilation mechanism includes a connecting pipe. The connecting pipe is fixedly installed on the top of the installation seat, the bottom of the connecting pipe is communicated with the ventilation pipe, both ends of the top of the connecting pipe are communicated with branch pipes, and electromagnetic valves are fixedly installed at one ends of the two branch pipes close to the connecting pipe.

[0009] Preferably, the driving mechanism two includes a driving gear, a driven gear and a driving motor. The driving motor is fixedly installed on the top of the installation seat, the driving gear is fixedly installed outside the output shaft of the driving motor, the driven gear is fixedly installed outside the ventilation pipe, and the driving gear meshes with the driven gear.

[0010] Preferably, the sealing mechanism includes an annular seat, an annular installation plate is slidably installed inside the annular seat, a plurality of uniformly distributed spring ones are fixedly installed between the top of the annular installation plate and the inner wall of the annular seat, and an annular sealing ring is fixedly installed at the bottom of the annular installation plate.

[0011] Preferably, the displacement mechanism includes a connecting component and a transmission component. The connecting component includes a connecting frame and a side plate. The connecting frame is fixedly installed on the top of the L-shaped hollow pipe, the side plate is fixedly installed on the side of the rotating cylinder close to the L-shaped hollow pipe, two transmission rods are fixed inside the connecting frame, two strip-shaped grooves are opened inside the side plate, and the two transmission rods are respectively slidably installed inside the two strip-shaped grooves.

[0012] Preferably, the transmission assembly includes two push rods, and the two push rods are symmetrically slidably sleeved on the bottom of the rotating drum. A support plate 1 is fixedly installed on the top of the two push rods. Two springs 2 are fixedly installed between the bottom of the support plate 1 and the inner wall of the rotating drum. A connecting rope is fixedly installed on the top of the support plate 1, and the end of the connecting rope away from the support plate 1 is fixedly connected to one of the transmission rods. A guide wheel is fixedly installed on the side of the inner wall of the rotating drum close to the side plate, and the connecting rope fits the surface of the guide wheel.

[0013] Preferably, the fixing mechanism includes a second support plate and a moving rod, the second support plate is fixedly installed on the outside of the two top rods, the moving rod is slidably fitted on the inside of the side plate, both ends of the front and back sides of the moving rod are fixedly installed with blocks, the end of the moving rod close to the top rod is rotatably installed with a push rod, and the end of the push rod away from the moving rod is rotatably installed on the top of the second support plate, and both ends of the front and back sides of the connecting frame are provided with card slots, and the four card slots respectively cooperate with the four card blocks.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. By evacuating the cavity of the circular magnesium alloy forging mold and then filling it with inert gas, the oxygen content inside the cavity of the circular magnesium alloy forging mold is reduced, and the combustion chain reaction is destroyed. In this scenario, when a scraper is used to remove magnesium chips adhering to the inside of the mold cavity, the magnesium chips will not burn even if they encounter sparks, thereby improving safety. In addition, the magnesium chips and other debris inside the cavity of the circular magnesium alloy forging mold are automatically cleaned, which is conducive to improving the processing efficiency of the finished magnesium alloy forgings.

[0016] 2. The L-shaped hollow tube is rotated by the provided driving mechanism, which is beneficial to improving the efficiency of inert gas filling. In addition, the displacement mechanism and the fixing mechanism ensure that the scraper does not come into contact with the inside of the mold cavity during the addition of inert gas, thereby avoiding the air from quickly re-entering the mold cavity after the seal fails, which may still cause an explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the mounting base structure of the present invention;

[0019] Figure 3 It is a partial cross-sectional view of the present invention;

[0020] Figure 4 A cross-sectional view of the mounting base and the sealing mechanism of the present invention;

[0021] Figure 5Cross-sectional view of the sealing mechanism of the present invention;

[0022] Figure 6 Front view of the rotary drum and the L-shaped ventilation pipe of the present invention;

[0023] Figure 7 Schematic diagram of the connection structure between the rotary drum and the side plate of the present invention;

[0024] Figure 8 Internal view of the rotary drum of the present invention;

[0025] Figure 9 Schematic diagram of the structure of the moving rod of the present invention;

[0026] Figure 10 Schematic diagram of the structure of the L-shaped hollow pipe of the present invention.

[0027] In the drawings, the list of components represented by each reference numeral is as follows: 1. Base; 2. Die forging mechanism; 3. Bracket; 4. Cylinder 1; 5. Cylinder 2; 6. Support plate; 7. Mounting seat; 8. Ventilation pipe; 9. Connecting pipe; 10. Branch pipe; 11. Solenoid valve; 12. Driving gear; 13. Driven gear; 14. Rotary drum; 15. L-shaped hollow pipe; 16. Scraper; 17. Through hole; 18. Hose; 19. Annular seat; 20. Annular mounting plate; 21. Spring 1; 22. Annular sealing ring; 23. Connecting frame; 24. Side plate; 25. Transmission rod; 26. Strip-shaped groove; 27. Thrust rod; 28. Support plate 1; 29. Spring 2; 30. Connecting rope; 31. Guide wheel; 32. Support plate 2; 33. Moving rod; 34. Block; 35. Push rod; 36. Card slot; 37. Driving motor. Detailed implementation manners

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] The present invention provides a technical solution: As Figures 1 - 10A forging device for a metal forging, comprising a base 1, a die forging mechanism 2 fixedly arranged on the top of the base 1, a first driving mechanism arranged on one side of the base 1, an installation seat 7 arranged in the first driving mechanism, a ventilation pipe 8 rotatably installed inside the installation seat 7, a ventilation mechanism arranged on the top of the ventilation pipe 8, a second driving mechanism arranged inside the installation seat 7, a sealing mechanism arranged at the bottom of the installation seat 7, a rotating cylinder 14 fixedly installed at the bottom of the ventilation pipe 8, an L-shaped hollow pipe 15 arranged on one side of the rotating cylinder 14, scraping blades 16 fixedly installed at the bottom of the L-shaped hollow pipe 15 and on the side away from the rotating cylinder 14, a displacement mechanism and a fixing mechanism arranged inside the L-shaped hollow pipe 15, a plurality of through holes 17 arranged on the outer side of the L-shaped hollow pipe 15, and a flexible pipe 18 communicated with one end of the L-shaped hollow pipe 15 close to the rotating cylinder 14, the top of the flexible pipe 18 being communicated with the ventilation pipe 8.

[0030] The first driving mechanism comprises a bracket 3, a first cylinder 4, two second cylinders 5 and a support plate 6. The bracket 3 is fixedly installed on one side of the base 1, the first cylinder 4 is fixedly installed inside the bracket 3, the support plate 6 is fixedly installed at the top of the telescopic shaft of the first cylinder 4, and the two second cylinders 5 are respectively and symmetrically fixedly installed at both ends of the top of the support plate 6. The sides of the telescopic shafts of the two second cylinders 5 away from the support plate 6 are both fixedly connected with the installation seat 7.

[0031] The ventilation mechanism comprises a connecting pipe 9. The connecting pipe 9 is fixedly installed on the top of the installation seat 7. The bottom of the connecting pipe 9 is communicated with the ventilation pipe 8. Both ends of the top of the connecting pipe 9 are communicated with branch pipes 10. Solenoid valves 11 are fixedly installed at the ends of the two branch pipes 10 close to the connecting pipe 9.

[0032] The second driving mechanism comprises a driving gear 12, a driven gear 13 and a driving motor 37. The driving motor 37 is fixedly installed on the top of the installation seat 7. The driving gear 12 is fixedly installed outside the output shaft of the driving motor 37. The driven gear 13 is fixedly installed outside the ventilation pipe 8. The driving gear 12 meshes with the driven gear 13.

[0033] The sealing mechanism comprises an annular seat 19. An annular mounting plate 20 is slidably installed inside the annular seat 19. A plurality of uniformly distributed first springs 21 are fixedly installed between the top of the annular mounting plate 20 and the inner wall of the annular seat 19. An annular sealing ring 22 is fixedly installed at the bottom of the annular mounting plate 20.

[0034] The displacement mechanism comprises a connecting component and a transmission component. The connecting component comprises a connecting frame 23 and a side plate 24. The connecting frame 23 is fixedly installed on the top of the L-shaped hollow pipe 15. The side plate 24 is fixedly installed on the side of the rotating cylinder 14 close to the L-shaped hollow pipe 15. Two transmission rods 25 are fixed inside the connecting frame 23. Two strip-shaped grooves are opened inside the side plate 24. The two transmission rods 25 are respectively slidably installed inside the two strip-shaped grooves.

[0035] The transmission assembly includes two ejector rods 27. The two ejector rods 27 are symmetrically and slidably sleeved at the bottom of the rotating cylinder 14. A first support plate 28 is fixedly installed at the tops of the two ejector rods 27. Two second springs 29 are fixedly installed between the bottom of the first support plate 28 and the inner wall of the rotating cylinder 14. A connecting rope 30 is fixedly installed at the top of the first support plate 28. One end of the connecting rope 30 away from the first support plate 28 is fixedly connected to one of the transmission rods 25. A guide wheel 31 is fixedly installed on one side of the inner wall of the rotating cylinder 14 close to the side plate 24. The connecting rope 30 is attached to the surface of the guide wheel 31.

[0036] The fixing mechanism includes a second support plate 32 and a moving rod 33. The second support plate 32 is fixedly installed outside the two ejector rods 27. The moving rod 33 is slidably and fittingly installed inside the side plate 24. Blocks 34 are fixedly installed at both ends of the front and back of the moving rod 33. A push rod 35 is rotatably installed at one end of the moving rod 33 close to the ejector rod 27. One end of the push rod 35 away from the moving rod 33 is rotatably installed at the top of the second support plate 32. Slots 36 are respectively formed at both ends of the front and back of the connecting frame 23. The four slots 36 are respectively matched with the four blocks 34.

[0037] Working principle: Before use, the two branch pipes 10 are respectively connected to a vacuum negative pressure machine and a liquid nitrogen vaporization system. After the die forging mechanism 2 finishes processing the circular magnesium alloy forging, the circular magnesium alloy forging is taken out, and then the magnesium chips and other debris remaining in the mold cavity of the die forging mechanism 2 are cleaned.

[0038] During cleaning, first, the elongation of the telescopic shafts of the two cylinders II 5 pushes the mounting seat 7 to move, so that it is located directly above the mold cavity in the die forging mechanism 2. Subsequently, the shortening of the telescopic shaft of the cylinder I 4 drives the mounting seat 7 to move downward. During the downward movement of the mounting seat 7, the annular sealing ring 22 first contacts the mold surface in the die forging mechanism 2. As the mounting seat 7 continues to descend, the annular seat 19 squeezes the multiple first springs 21 and the annular mounting plate 20, so that the annular sealing ring 22 is in close contact with the mold surface in the die forging mechanism 2, realizing the sealing of the mold cavity in the die forging mechanism 2. At this time, the two scrapers 16 still have a certain distance from the bottom and the side wall of the mold cavity. Then, the cylinder I 4 is closed. Subsequently, the solenoid valve 11 at one end of the branch pipe 10 connected to the vacuum negative pressure machine is opened (the solenoid valve 11 in the other branch pipe 10 is in the closed state), and the vacuum negative pressure machine is started. At this time, the air inside the mold cavity is successively extracted through the through holes 17, the L-shaped hollow pipe 15, the hose 18, the ventilation pipe 8, and this branch pipe 10. While extracting the air inside the mold cavity, some magnesium chips and other debris generated during the processing of the circular magnesium alloy forging inside the mold cavity will also be extracted. After the inside of the mold cavity is vacuumed, the solenoid valve 11 in this branch pipe 10 is closed. Subsequently, the solenoid valve 11 in the branch pipe 10 connected to the liquid nitrogen gasification system is opened, and the inert gas in the liquid nitrogen gasification system successively passes through this branch pipe 10, the ventilation pipe 8, the hose 18, the L-shaped hollow pipe 15, and finally enters the inside of the mold cavity through the multiple through holes 17. At the same time, by starting the drive motor 37, the driving gear 12 is driven to rotate. Under the action of the meshing of the driving gear 12 and the driven gear 13, the driven gear 13 can drive the ventilation pipe 8 to rotate, and the rotating cylinder 14 and the L-shaped hollow pipe 15 rotate synchronously. The inert gas ejected from the multiple through holes 17 can quickly fill every corner in the mold cavity, which is beneficial to improving the filling efficiency of the inert gas. The increase of the inert gas reduces the oxygen content inside the mold cavity of the circular magnesium alloy forging (it should be noted that during the filling of the inert gas, if the two scrapers 16 start to clean and the sealing fails at this time, the air will quickly re-enter the mold cavity, and there will still be an explosion situation. For this situation, the "at this time, the two scrapers 16 still have a certain distance from the bottom and the side wall of the mold cavity" mentioned in the above steps can well solve this problem. The two scrapers 16 will not rub against the mold cavity to generate local high temperature, so there will be no explosion situation).

[0039] After the inert gas filling is completed, close the corresponding solenoid valve 11 and the drive motor 37. Then, drive the mounting seat 7 to descend again through the first cylinder 4. The two ejector rods 27 gradually approach the bottom of the mold. When the two ejector rods 27 contact the bottom of the mold, as the mounting seat 7 and the rotating cylinder 14 continue to descend, the second spring 29 is stretched, the distance between the first support plate 28 and the guide wheel 31 is shortened, and the length of the connecting rope 30 outside the rotating cylinder 14 increases. The L-shaped hollow tube 15 and the connecting frame 23 drive the two transmission rods 25 to tilt and slide downward respectively under the action of their own gravity and the two strip-shaped grooves 26. When the rotating cylinder 14 moves to the bottommost position, the two scrapers 16 are respectively in contact with the bottom and the side wall of the mold cavity. Due to the descent of the rotating cylinder 14, the distance between the second support plate 32 and the moving rod 33 is shortened, and the push rod 35 exerts a thrust on the moving rod 33. The moving rod 33 drives the four clamping blocks 34 to move synchronously. When the rotating cylinder 14 moves to the bottommost position, the four clamping blocks 34 respectively correspond to their respective clamping grooves 36 and are inserted into their respective clamping grooves 36 to fix the L-shaped hollow tube 15, avoiding the upward movement tendency of the two scrapers 16 when touching the magnesium chips with strong adhesion force subsequently. Then, drive the L-shaped hollow tube 15 to rotate again through the drive mechanism, so as to drive the two scrapers 16 to clean the magnesium chips adhered to the inner wall of the mold cavity. After the cleaning is completed, the debris inside the mold cavity can also be collected by means of a vacuum negative pressure machine.

[0040] Finally, drive the mounting seat 7 and the rotating cylinder 14 to rise through the first cylinder 4. The ejector rods 27 gradually move away from the bottom of the mold cavity. Then, under the action of the second spring 29, the two ejector rods 27 return to their original positions. The moving rod 33 drives the four clamping blocks 34 to disengage from their respective clamping grooves 36, and the connecting rope 30 also pulls the L-shaped hollow tube 15 back to its original position.

[0041] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0042] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A forging device for metal forgings, comprising a base (1) and a die forging mechanism (2) fixedly arranged on the top of the base (1), characterized in that: One side of the base (1) is provided with a first driving mechanism. An installation seat (7) is arranged in the first driving mechanism. A ventilation pipe (8) is rotatably installed inside the installation seat (7). An air venting mechanism is arranged at the top of the ventilation pipe (8). A second driving mechanism is arranged inside the installation seat (7). A sealing mechanism is arranged at the bottom of the installation seat (7). A rotating cylinder (14) is fixedly installed at the bottom of the ventilation pipe (8). An L-shaped hollow pipe (15) is arranged on one side of the rotating cylinder (14). Scraping blades (16) are fixedly installed at the bottom of the L-shaped hollow pipe (15) and on the side away from the rotating cylinder (14). A displacement mechanism and a fixing mechanism are arranged inside the L-shaped hollow pipe (15). A plurality of through holes (17) are formed in the outer side of the L-shaped hollow pipe (15). One end of the L-shaped hollow pipe (15) close to the rotating cylinder (14) is communicated with a flexible pipe (18). The top of the flexible pipe (18) is communicated with the ventilation pipe (8).

2. A forging device for metal forgings according to claim 1, characterized in that: The first driving mechanism includes a bracket (3), a first cylinder (4), two second cylinders (5) and a support plate (6). The bracket (3) is fixedly installed on one side of the base (1). The first cylinder (4) is fixedly installed inside the bracket (3). The support plate (6) is fixedly installed at the top end of the telescopic shaft of the first cylinder (4). The two second cylinders (5) are respectively and symmetrically fixedly installed at both ends of the top of the support plate (6). The telescopic shafts of the two second cylinders (5) away from the support plate (6) are fixedly connected with the installation seat (7).

3. The forging device for a metal forging according to claim 1, characterized in that: The air venting mechanism includes a connecting pipe (9). The connecting pipe (9) is fixedly installed at the top of the installation seat (7). The bottom of the connecting pipe (9) is communicated with the ventilation pipe (8). Branch pipes (10) are communicated at both ends of the top of the connecting pipe (9). Solenoid valves (11) are fixedly installed at one ends of the two branch pipes (10) close to the connecting pipe (9).

4. The forging device for a metal forging according to claim 1, characterized in that: The second driving mechanism includes a driving gear (12), a driven gear (13) and a driving motor (37). The driving motor (37) is fixedly installed at the top of the installation seat (7). The driving gear (12) is fixedly installed on the outside of the output shaft of the driving motor (37). The driven gear (13) is fixedly installed on the outside of the ventilation pipe (8). The driving gear (12) meshes with the driven gear (13).

5. The forging device for a metal forging according to claim 1, characterized in that: The sealing mechanism includes an annular seat (19). An annular mounting plate (20) is slidably installed inside the annular seat (19). A plurality of uniformly distributed first springs (21) are fixedly installed between the top of the annular mounting plate (20) and the inner wall of the annular seat (19). An annular sealing ring (22) is fixedly installed at the bottom of the annular mounting plate (20).

6. The forging device for a metal forging according to claim 1, wherein: The displacement mechanism includes a connection component and a transmission component. The connection component includes a connection frame (23) and side plates (24). The connection frame (23) is fixedly installed at the top of the L-shaped hollow tube (15), and the side plates (24) are fixedly installed on the side of the rotary cylinder (14) close to the L-shaped hollow tube (15). Two transmission rods (25) are fixed inside the connection frame (23), and two strip-shaped grooves (26) are formed inside the side plates (24). The two transmission rods (25) are respectively slidably installed inside the two strip-shaped grooves (26).

7. The forging device for a metal forging according to claim 6, characterized in that: The transmission component includes two ejector rods (27). The two ejector rods (27) are symmetrically and slidably sleeved at the bottom of the rotary cylinder (14). A first support plate (28) is fixedly installed at the tops of the two ejector rods (27). Two second springs (29) are fixedly installed between the bottom of the first support plate (28) and the inner wall of the rotary cylinder (14). A connection rope (30) is fixedly installed at the top of the first support plate (28). One end of the connection rope (30) away from the first support plate (28) is fixedly connected to one of the transmission rods (25). A guide wheel (31) is fixedly installed on the side of the inner wall of the rotary cylinder (14) close to the side plate (24). The connection rope (30) is attached to the surface of the guide wheel (31).

8. A forging device for a metal forging according to claim 7, characterized in that: The fixing mechanism includes a second support plate (32) and a moving rod (33). The second support plate (32) is fixedly installed outside the two ejector rods (27). The moving rod (33) is slidably attached and installed inside the side plate (24). Blocks (34) are fixedly installed at both ends of the front and back of the moving rod (33). A push rod (35) is rotatably installed at one end of the moving rod (33) close to the ejector rod (27). One end of the push rod (35) away from the moving rod (33) is rotatably installed at the top of the second support plate (32). Slots (36) are formed at both ends of the front and back of the connection frame (23). The four slots (36) cooperate with the four blocks (34) respectively.

Images