A centering and lifting device for a double-column open-die hydraulic press

Abstract

The application discloses a centering and lifting device of a double-column free forging hydraulic press, which comprises a supporting plate, the supporting plate is provided with fixing seats, a placing seat is arranged between the two fixing seats, the top of each fixing seat is provided with a first buffer pipe, a buffer mechanism is arranged on the first buffer pipe, a sliding ring is arranged on the right side of the buffer mechanism, a second buffer pipe is connected to the sliding ring, a second through hole is arranged on the second buffer pipe, a fixed through pipe is arranged in the second buffer pipe, a second sealing seat is connected to the right side of the first buffer pipe, and a clamping head is connected to the right side of the second buffer pipe. The damper pipe is arranged in the first buffer pipe, the second buffer pipe can play a buffering role in the moving process by means of the damper pipe, and compared with the configuration of a traditional hydraulic cylinder with a buffering function, the centering and lifting device is simple, so that the buffering effect is improved and the manufacturing cost is reduced. Since the buffer mechanism is composed of the damper pipe and the first through hole structure on the damper pipe, the reciprocating distance of the damper pipe is fully ensured, and the buffering distance is lengthened.

Description

Technical Field

[0001] This invention relates to the field of double-column free forging hydraulic presses, and more particularly to a centering and lifting device for a double-column free forging hydraulic press. Background Technology

[0002] Free forging is a processing method that uses impact force or pressure to allow metal to deform freely in all directions between the upper and lower anvils without any restrictions, thereby obtaining forgings with the required shape, size, and certain mechanical properties.

[0003] Traditional double-column free forging hydraulic presses do not require a centering function. However, with continuous technological innovation and the continuous improvement of manufacturing level, the requirements for double-column free forging hydraulic presses are becoming increasingly higher. The requirements for manufacturing some products are also becoming more and more demanding. Therefore, in order to manufacture higher quality parts, it is necessary to integrate this function into the double-column free forging hydraulic press. The integrated centering lifting device is mostly driven by hydraulic cylinders. Conventional hydraulic cylinders do not have a buffer during use, which will generate strong impact force and noise, which is not conducive to long-term use. Summary of the Invention

[0004] The purpose of this invention is to provide a centering and lifting device for a double-column free forging hydraulic press to solve the above-mentioned technical problems.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A centering and lifting device for a double-column free forging hydraulic press includes a support plate. Two fixed seats are fixedly connected to the top of the support plate, and a placement seat is disposed between the two fixed seats. The placement seat is fixedly connected to the support plate. A first buffer tube is fixedly connected to the top of the fixed seats. A buffer mechanism is disposed on the left side of the first buffer tube, and a sliding ring is disposed on the right side of the buffer mechanism. The sliding ring is slidably connected to the first buffer tube. A second buffer tube is fixedly connected to the sliding ring. Multiple second through holes are provided through the second buffer tube. A fixed through pipe is disposed inside the second buffer tube and is fixedly connected to the sliding ring. A second sealing seat is fixedly connected to the right side of the first buffer tube and is slidably connected to the second buffer tube. A clamping head is fixedly connected to the right side of the second buffer tube and is fixedly connected to the fixed through pipe.

[0007] Preferably, the buffer mechanism includes a first sealing seat, which is connected to a first buffer tube by bolts. A damping tube is fixedly connected to the right side of the first sealing seat. A plurality of first through holes are provided through the damping tube. A first liquid inlet pipe and a second liquid inlet pipe are fixedly connected to the clamping head. The first liquid inlet pipe extends into the interior of the second buffer tube, and the second liquid inlet pipe extends into the interior of the fixed through pipe.

[0008] Preferably, a lifting mechanism is fixedly connected to the bottom of the support plate. The lifting mechanism includes multiple fixed sleeves, and a sliding column is slidably connected inside each fixed sleeve. The top of the sliding column is fixedly connected to the support plate, and a limit post is fixedly connected to the sliding column. The multiple fixed sleeves are connected to each other through a first support rod. A second support rod is fixedly connected to the first support rod, and a driving structure is fixedly connected between the two second support rods. A rotating plate is fixedly connected to the driving structure, and a limit frame is fixedly connected to the rotating plate. The limit post is located inside the limit frame.

[0009] Preferably, the drive structure includes a third drive box, which is fixedly connected to the second support rod. Multiple positioning plates are fixedly connected to the inner wall of the bottom of the third drive box. Worms are rotatably connected to the positioning plates. First bevel gears are fixedly connected to the opposite ends of the two worms. A first rotating shaft is provided through the bottom of the third drive box and is rotatably connected to it. A second bevel gear is fixedly connected to the first rotating shaft and meshes with it. A lubrication assembly is fixedly connected to the first rotating shaft. A worm wheel meshes with the worm, and a rotating rod is fixedly connected to the worm wheel. The rotating rod passes through the third drive box and is rotatably connected to it. The rotating rod is fixedly connected to a rotating plate.

[0010] Preferably, the lubrication assembly includes a mounting box, which is fixedly connected to a third drive box. A first threaded plate is slidably connected inside the mounting box, and a third screw is threadedly connected to the first threaded plate. The third screw is fixedly connected to a first rotating shaft. A connecting rod is fixedly connected to the top of the first threaded plate, and a piston plate is fixedly connected to the top of the connecting rod. The piston plate is slidably connected to the mounting box. A sliding groove is provided through the right side of the mounting box, and a sliding rod is slidably connected inside the sliding groove. The sliding rod is fixedly connected to the first threaded plate, and multiple retaining teeth are fixedly connected to the sliding rod. Oil injection pipes are fixedly connected to both the left and right sides of the mounting box.

[0011] Preferably, an oil reservoir is fixedly connected to the top of the third drive box, and the bottom of the oil reservoir is connected to the mounting box via an oil injection pipe. A rotating component is fixedly connected inside the oil injection pipe, and a first screw is rotatably connected to the rotating component. A fourth bevel gear is fixedly connected to the first screw, and a third bevel gear meshes with the fourth bevel gear. A drive shaft is fixedly connected to the third bevel gear, and the drive shaft passes through the oil injection pipe and is rotatably connected to it. A first ordinary gear is fixedly connected to the drive shaft. Two first sealing blocks are fixedly connected inside the oil injection pipe, and a second sealing block is disposed between the two first sealing blocks. The second sealing block is threadedly connected to the first screw and slidably connected to the oil injection pipe.

[0012] Preferably, a second drive box is fixedly connected to the bottom of the third drive box, the bottom end of the first rotating shaft extends into the second drive box and is rotatably connected to the second drive box, a second ordinary gear is fixedly connected to the first rotating shaft, a rack meshes on the second ordinary gear, and sealing slide plates are fixedly connected to both sides of the rack, and the sealing slide plates are connected to the second drive box through a first spring.

[0013] Preferably, the bottom of the second drive box is fixedly connected to the first drive box, and the left and right sides of the first drive box are fixedly connected to the third liquid inlet pipes. The third liquid inlet pipes are connected to the second drive box. A second screw is provided through the first drive box. The second screw is rotatably connected to the first drive box. A second threaded plate is slidably connected inside the first drive box. The second threaded plate is threadedly connected to the second screw. A fourth liquid inlet pipe is connected to the first drive box.

[0014] The beneficial effects of this invention are:

[0015] 1. This invention, by setting a damping tube inside the first buffer tube, enables the second buffer tube to play a buffering role during movement. Compared with the configuration of traditional hydraulic cylinders with buffering function, it is simpler, thus improving the buffering effect while reducing manufacturing costs. Since the buffering mechanism consists of a damping tube and a first through-hole structure on the damping tube, it can extend the buffering distance while fully ensuring the reciprocating distance of the damping tube. In addition, since the damping tube is easy to replace, the buffering effect can be freely adjusted by replacing the damping tube according to the maintenance and usage environment. This invention can be applied to pneumatic cylinders and hydraulic cylinders. Although this invention is described using a hydraulic cylinder as an example, it is not limited to this.

[0016] 2. By rotating the second screw, the second threaded block is divided into the fourth inlet pipe, resulting in different pressures at both ends of the rack. This effectively controls the rotation direction of the rotating rod, which in turn controls whether the support plate moves up or down. The distance by which the support plate moves up or down is also determined by the proportion by which the second threaded block divides the fourth inlet pipe.

[0017] 3. During the process of controlling the up and down movement of the support plate, the present invention can also use the piston plate to squeeze and spray out lubricating oil, thereby facilitating the intermittent lubrication of the gears required for the work, avoiding the lack of lubrication between gears and affecting the use, and the lubricating oil can be automatically added after use, which is convenient for subsequent use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 for Figure 1Enlarged schematic diagram of part A;

[0020] Figure 3 This is a schematic diagram of the internal structure of the first buffer tube and the second buffer tube of the present invention;

[0021] Figure 4 This is a schematic diagram of the driving structure of the present invention;

[0022] Figure 5 for Figure 4 Enlarged schematic diagram of part B;

[0023] Figure 6 This is a schematic diagram of the internal structure of the oil injection pipe of the present invention;

[0024] Figure 7 This is a schematic diagram of the internal structure of the second drive box of the present invention;

[0025] Figure 8 This is a schematic diagram of the internal structure of the first drive box of the present invention.

[0026] Reference numerals: 1. First buffer tube; 2. Fixed seat; 3. Second buffer tube; 4. Clamping head; 5. Placement seat; 6. Support plate; 7. Sliding column; 8. Fixed sleeve; 9. Rotating plate; 10. First support rod; 11. Rotating rod; 12. Oil tank; 13. Second support rod; 14. First drive box; 15. Third drive box; 16. First sealing seat; 17. Bolt; 19. First through hole; 20. Damping tube; 21. Sliding ring; 22. Second through hole; 23. Limiting column; 24. Fixed through pipe; 25. Second sealing seat; 26. First inlet pipe; 28. Second inlet pipe; 29. ​​Limiting frame; 30. Worm gear; 31. Worm; 32. Positioning plate 33. First bevel gear; 34. First rotating shaft; 35. Second bevel gear; 36. Third screw; 37. First threaded plate; 38. Connecting rod; 39. Piston plate; 40. Injection pipe; 41. Mounting box; 42. Gear clip; 43. Injection pipe; 44. First ordinary gear; 45. Sliding rod; 46. Rotating component; 47. First screw; 48. First sealing block; 49. Second sealing block; 50. Third bevel gear; 51. Fourth bevel gear; 52. First spring; 53. Second drive box; 54. Rack; 55. Second ordinary gear; 56. Third inlet pipe; 57. Second screw; 58. Fourth inlet pipe; 59. Second threaded plate. Detailed Implementation

[0027] To make the technical means, creative features, achieved objectives, and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention.

[0028] Specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0029] Example 1:

[0030] like Figure 1-8 As shown, a centering and lifting device for a double-column free forging hydraulic press includes a support plate 6. Two fixed seats 2 are fixedly connected to the top of the support plate 6. A placement seat 5 is provided between the two fixed seats 2. The placement seat 5 is fixedly connected to the support plate 6. A first buffer tube 1 is fixedly connected to the top of the fixed seat 2. A buffer mechanism is provided on the left side of the first buffer tube 1. A sliding ring 21 is provided on the right side of the buffer mechanism. The sliding ring 21 is slidably connected to the first buffer tube 1. A second buffer tube 3 is fixedly connected to the sliding ring 21. Multiple second through holes 22 are provided through the second buffer tube 3. A fixed through pipe 24 is provided inside the second buffer tube 3. The fixed through pipe 24 is fixedly connected to the sliding ring 21. A second sealing seat 25 is fixedly connected to the right side of the first buffer tube 1. The second sealing seat 25 is slidably connected to the second buffer tube 3. A clamping head 4 is fixedly connected to the right side of the second buffer tube 3. The clamping head 4 is fixedly connected to the fixed through pipe 24.

[0031] The buffer mechanism includes a first sealing seat 16, which is connected to the first buffer tube 1 by bolts 17. A damping tube 20 is fixedly connected to the right side of the first sealing seat 16. Multiple first through holes 19 are provided through the damping tube 20. A first liquid inlet tube 26 and a second liquid inlet tube 28 are fixedly connected to the clamping head 4. The first liquid inlet tube 26 extends into the interior of the second buffer tube 3, and the second liquid inlet tube 28 extends into the interior of the fixed through tube 24.

[0032] When it is necessary to center and clamp the workpiece on the placement seat 5, liquid can be added into the second liquid inlet pipe 28. The liquid enters the damping pipe 20 through the fixed through pipe 24 and is discharged through the first through hole 19 on the damping pipe 20. The discharged liquid will fill the cavity, which will cause the sliding ring 21 to move continuously. The movement of the sliding ring 21 will drive the second buffer pipe 3 and the clamping head 4 to move. Since the two second buffer pipes 3 and clamping heads 4 move at the same speed, the items on the placement seat 5 can be squeezed and centered.

[0033] When clamping with clamping head 4 is not required, liquid can be introduced into the first liquid inlet pipe 26. The liquid introduced into the first liquid inlet pipe 26 will enter the second buffer pipe 3 and be discharged through the second through hole 22. The discharged liquid will squeeze the sliding ring 21, causing the sliding ring 21 to continuously approach the first sealing seat 16. Due to the restriction of the damping pipe 20, it has a buffering function, which makes its movement more stable, reduces the noise and impact generated by the contact between the sliding ring 21 and the first sealing column, and makes it more durable.

[0034] Furthermore, by removing bolt 17, the limiting position between the first sealing seat 16 and the first buffer tube 1 can be removed, making it easier to remove the first sealing seat 16 and thus easier to remove and replace the damping head.

[0035] Example 2:

[0036] like Figure 1-8 As shown, while other parts are the same as in Embodiment 1, the difference between this embodiment and Embodiment 1 is that: a lifting mechanism is fixedly connected to the bottom of the support plate 6, the lifting mechanism includes multiple fixed sleeves 8, a sliding column 7 is slidably connected inside the fixed sleeve 8, the top of the sliding column 7 is fixedly connected to the support plate 6, a limit column 23 is fixedly connected to the sliding column 7, the multiple fixed sleeves 8 are connected to each other through a first support rod 10, a second support rod 13 is fixedly connected to the first support rod 10, a driving structure is fixedly connected between the two second support rods 13, a rotating plate 9 is fixedly connected to the driving structure, a limit frame 29 is fixedly connected to the rotating plate 9, and the limit column 23 is located inside the limit frame 29;

[0037] The drive structure includes a third drive box 15, which is fixedly connected to a second support rod 13. Multiple positioning plates 32 are fixedly connected to the inner wall of the bottom of the inner cavity of the third drive box 15. Worms 31 are rotatably connected to the positioning plates 32. First bevel gears 33 are fixedly connected to the opposite ends of the two worms 31. A first rotating shaft 34 is provided through the bottom of the third drive box 15. The first rotating shaft 34 is rotatably connected to the third drive box 15. A second bevel gear 35 is fixedly connected to the first rotating shaft 34. The second bevel gear 35 meshes with the first bevel gear 33. A lubrication component is fixedly connected to the first rotating shaft 34. A worm wheel 30 meshes with the worm 31. A rotating rod 11 is fixedly connected to the worm wheel 30. The rotating rod 11 passes through the third drive box 15 and is rotatably connected to the third drive box 15. The rotating rod 11 is fixedly connected to the rotating plate 9.

[0038] The bottom of the third drive box 15 is fixedly connected to the second drive box 53. The bottom end of the first rotating shaft 34 extends into the second drive box 53 and is rotatably connected to the second drive box 53. The first rotating shaft 34 is fixedly connected to the second ordinary gear 55. The second ordinary gear 55 meshes with the rack 54. The left and right sides of the rack 54 are fixedly connected to the sealing slide plate. The sealing slide plate is connected to the second drive box 53 through the first spring 52.

[0039] The bottom of the second drive box 53 is fixedly connected to the first drive box 14. The left and right sides of the first drive box 14 are fixedly connected to the third liquid inlet pipes 56. The third liquid inlet pipes 56 are connected to the second drive box 53. The first drive box 14 is provided with a second screw 57 through it. The second screw 57 is rotatably connected to the first drive box 14. The first drive box 14 is slidably connected with a second threaded plate 59. The second threaded plate 59 is threadedly connected to the second screw 57. The first drive box 14 is connected to a fourth liquid inlet pipe 58.

[0040] When the required height needs to be increased, the second screw 57 can be rotated, causing the second screw 57 to move the second threaded plate 59. Since the requirement is to increase the height, the fourth liquid inlet pipe 58 should be divided by the second threaded block with the right side being larger and the left side smaller. In this way, a large amount of liquid will enter the right side of the first drive box 14. The pressure on the right side is greater, so the rack 54 will move to the left. The leftward movement of the rack 54 will drive the second ordinary gear 55 to rotate. The rotation of the second ordinary gear 55 will cause the first rotating shaft 34 to rotate. The first rotating shaft 34 drives the worm 31 to rotate through the first bevel gear 33 and the second bevel gear 35. The worm 31 drives the worm wheel 30 to rotate. The worm wheel 30 drives the rotating rod 11 to rotate. The rotating rod 11 drives the rotating plate 9 to rotate. Since the two rotating rods 11 rotate in different directions, the rotating plate 9 will rotate upward. The rotating plate 9 drives the limiting frame 29, causing the limiting frame 29 to move the sliding column 7 upward. The upward movement of the sliding column 7 drives the support plate 6 to move upward, so the clamping head 4 will also move upward.

[0041] Furthermore, the amount of upward movement is determined by the distribution ratio of the fourth inlet pipe 58.

[0042] Example 3:

[0043] like Figure 1-8As shown, while other parts are the same as in Embodiment 1, the difference between this embodiment and Embodiment 1 is that: the lubrication assembly includes a mounting box 41, which is fixedly connected to the third drive box 15. A first threaded plate 37 is slidably connected inside the mounting box 41, and a third screw 36 is threadedly connected to the first threaded plate 37. The third screw 36 is fixedly connected to the first rotating shaft 34. A connecting rod 38 is fixedly connected to the top of the first threaded plate 37, and a piston plate 39 is fixedly connected to the top of the connecting rod 38. The piston plate 39 is slidably connected to the mounting box 41. A sliding groove is provided through the right side of the mounting box 41, and a sliding rod 45 is slidably connected inside the sliding groove. The sliding rod 45 is fixedly connected to the first threaded plate 37, and multiple locking teeth 42 are fixedly connected to the sliding rod 45. Oil injection pipes 40 are fixedly connected to both the left and right sides of the mounting box 41.

[0044] The top of the third drive box 15 is fixedly connected to an oil reservoir 12. The bottom of the oil reservoir 12 is connected to the mounting box 41 through an oil injection pipe 43. A rotating part 46 is fixedly connected inside the oil injection pipe 43. A first screw 47 is rotatably connected to the rotating part 46. A fourth bevel gear 51 is fixedly connected to the first screw 47. A third bevel gear 50 meshes with the fourth bevel gear 51. A drive shaft is fixedly connected to the third bevel gear 50. The drive shaft passes through the oil injection pipe 43 and is rotatably connected to the oil injection pipe 43. A first ordinary gear 44 is fixedly connected to the drive shaft. Two first sealing blocks 48 are fixedly connected inside the oil injection pipe 43. A second sealing block 49 is provided between the two first sealing blocks 48. The second sealing block 49 is threadedly connected to the first screw 47 and slidably connected to the oil injection pipe 43.

[0045] When adjusting the height, when the first rotating rod 11 rotates forward, it will drive the third screw 36 to rotate. The third screw 36 will drive the first threaded plate 37 to move the piston plate 39 upward. The upward movement of the piston plate 39 will squeeze the lubricating oil and spray the lubricating oil through the oil spray pipe 40. The sprayed lubricating oil will fall onto various gears to provide lubrication for the gears.

[0046] Furthermore, when the lubricating oil in the mounting box 41 is used up and needs to be refilled, the adjusted height can be directly restored to its original state. During the restoration process, the slide bar 45 will continuously move down. When the slide bar 45 moves down to the moving position, the locking teeth 42 on the slide bar 45 will drive the first ordinary gear 44 to rotate. The first ordinary gear 44 drives the drive shaft to rotate. The drive shaft drives the first screw 47 to rotate through the third bevel gear 50 and the fourth bevel gear 51. The first screw 47 drives the second sealing block 49 to move. When the second sealing block 49 separates from the first sealing block 48, the lubricating oil in the oil tank 12 will be transported into the mounting box 41 through the gap for use.

[0047] When the slide bar 45 moves upward, the second sealing block 49 will engage with the first sealing block 48, thereby stopping the oil supply and avoiding waste.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A centering and lifting device of a double-column open-die hydraulic press, comprising a support plate (6), characterized in that: The support plate (6) top fixedly connected with two fixed seat (2), two fixed seat (2) between the setting has a rest (5), the rest (5) and support plate (6) fixedly connected, the fixed seat (2) top fixedly connected with first buffer tube (1), the first buffer tube (1) left side sets up buffer mechanism, the buffer mechanism right side is provided with sliding ring (21), the sliding ring (21) and first buffer tube (1) slidingly connected, the sliding ring (21) is fixedly connected with second buffer tube (3) on, a plurality of second through hole (22) are provided on second buffer tube (3), second buffer tube (3) inside is provided with fixed through pipe (24), the fixed through pipe (24) is fixedly connected with sliding ring (21), the first buffer tube (1) right side is fixedly connected with second plugging seat (25), the second plugging seat (25) and second buffer tube (3) slidingly connected, the second buffer tube (3) right side is fixedly connected with clamping head (4), the clamping head (4) is fixedly connected with fixed through pipe (24); The support plate (6) bottom fixedly connected with lifting mechanism, the lifting mechanism includes a plurality of fixed sleeve (8), the fixed sleeve (8) inside slidingly connected with sliding column (7), the sliding column (7) top and support plate (6) fixedly connected, the sliding column (7) is fixedly connected with limit post (23) on, a plurality of fixed sleeve (8) are connected through first support rod (10), the first support rod (10) is fixedly connected with second support rod (13), two second support rod (13) between fixedly connected with drive structure, the drive structure is fixedly connected with rotating plate (9) on, the rotating plate (9) is fixedly connected with limit frame (29) on, the limit post (23) is located in the limit frame (29) inside; The drive structure includes third drive box (15), the third drive box (15) is fixedly connected with second support rod (13), a plurality of positioning plate (32) are fixedly connected on the inner cavity bottom inner wall of third drive box (15), the positioning plate (32) is rotatably connected with worm (31) on, both ends of two worm (31) are fixedly connected with first bevel gear (33), the first rotation shaft (34) is arranged through the bottom of third drive box (15), the first rotation shaft (34) is rotatably connected with third drive box (15), the first rotation shaft (34) is fixedly connected with second bevel gear (35), the second bevel gear (35) is engaged with first bevel gear (33), the first rotation shaft (34) is fixedly connected with lubricating assembly, the worm (31) is engaged with worm wheel (30), the worm wheel (30) is fixedly connected with rotating rod (11), the rotating rod (11) penetrates third drive box (15) and is rotatably connected with third drive box (15), the rotating rod (11) is fixedly connected with rotating plate (9); The lubricating assembly comprises a mounting box (41), the mounting box (41) is fixedly connected with the third driving box (15), a first threaded plate (37) is slidably connected inside the mounting box (41), a third screw rod (36) is threadedly connected on the first threaded plate (37), the third screw rod (36) is fixedly connected with a first rotating shaft (34), a connecting rod (38) is fixedly connected on the top of the first threaded plate (37), a piston plate (39) is fixedly connected on the top of the connecting rod (38), the piston plate (39) is slidably connected with the mounting box (41), a sliding groove is formed in the right side of the mounting box (41), a sliding rod (45) is slidably connected inside the sliding groove, the sliding rod (45) is fixedly connected with the first threaded plate (37), a plurality of clamping teeth (42) are fixedly connected on the sliding rod (45), and oil injection pipes (40) are fixedly connected on the left and right sides of the mounting box (41).

2. The centering and lifting device of a double-column open-die hydraulic press according to claim 1, characterized in that: The buffering mechanism comprises a first blocking seat (16), the first blocking seat (16) is connected with the first buffering pipe (1) through bolts (17), a damping pipe (20) is fixedly connected to the right side of the first blocking seat (16), a plurality of first through holes (19) are formed in the damping pipe (20), a first liquid inlet pipe (26) and a second liquid inlet pipe (28) are fixedly connected to the clamping head (4), the first liquid inlet pipe (26) extends into the second buffering pipe (3), and the second liquid inlet pipe (28) extends into the fixed through pipe (24).

3. The centering and lifting device of a double-column open-die hydraulic press according to claim 1, characterized in that: The third driving box (15) is fixedly connected with an oil storage tank (12) on the top, the oil storage tank (12) is connected with the mounting box (41) through an oil injection pipe (43) on the bottom, a rotating piece (46) is fixedly connected inside the oil injection pipe (43), a first screw rod (47) is rotatably connected to the rotating piece (46), a fourth bevel gear (51) is fixedly connected to the first screw rod (47), a third bevel gear (50) is engaged with the fourth bevel gear (51), a driving shaft is fixedly connected to the third bevel gear (50), the driving shaft penetrates through and is rotatably connected with the oil injection pipe (43), a first common gear (44) is fixedly connected to the driving shaft, two first blocking blocks (48) are fixedly connected inside the oil injection pipe (43), a second blocking block (49) is arranged between the two first blocking blocks (48), the second blocking block (49) is threadedly connected with the first screw rod (47), and the second blocking block (49) is slidably connected with the oil injection pipe (43).

4. The centering and lifting device of a double-column open-die hydraulic press according to claim 1, characterized in that: The third driving box (15) is fixedly connected with a second driving box (53) on the bottom, the first rotating shaft (34) extends into and is rotatably connected with the second driving box (53) at the bottom end, a second common gear (55) is fixedly connected to the first rotating shaft (34), a rack (54) is engaged with the second common gear (55), blocking sliding plates are fixedly connected to the left and right sides of the rack (54), and the blocking sliding plates are connected with the second driving box (53) through first springs (52).

5. The centering and lifting device of a double-column open-die hydraulic press according to claim 4, characterized in that: The bottom of the second driving box (53) is fixedly connected with a first driving box (14), the left and right sides of the first driving box (14) are fixedly connected with third liquid inlet pipes (56), the third liquid inlet pipes (56) are connected with the second driving box (53), a second screw rod (57) is arranged through the first driving box (14), the second screw rod (57) is rotationally connected with the first driving box (14), a second screw plate (59) is slidably connected in the first driving box (14), the second screw plate (59) is threadedly connected with the second screw rod (57), and the first driving box (14) is connected with fourth liquid inlet pipes (58).

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