Hydraulic machine for stretching metal material

Abstract

The invention relates to a hydraulic machine for stretching a metal material, the hydraulic machine comprises a machine body, a movable table, an oil cylinder, a workbench and a die fixing seat, the workbench is slidably connected with a first stretching block in the horizontal direction, the workbench is provided with a first spring, and the first spring always drives the first stretching block to move towards the die fixing seat; a second stretching block is connected to the first stretching block in a sliding mode, and a second spring used for driving the second stretching block to move away from the first stretching block is arranged on the first stretching block. Two stand columns are arranged on the workbench, and limiting blocks are connected to the stand columns in a sliding mode. Two push blocks are arranged on the movable table, the faces, close to each other, of the two second stretching blocks are first inclined faces, and the two push blocks abut against the two first inclined faces respectively. The metal material can be subjected to stretching treatment before being stamped.

Description

Technical Field

[0001] The invention relates to the field of stretching machinery, in particular to a hydraulic press for stretching metal materials. Background Art

[0002] Hydraulic presses are widely used in heavy industrial production. The common hydraulic presses currently in common use can only be used for pressing most of the time and have a single function.

[0003] In the process of forming metal parts with complex structures, the metal material needs to be stretched. Through the stretching process, the plasticity of the metal material is improved, making it easier to perform stamping and reducing the problems of breakage and deformation. The existing production process uses two hydraulic presses to stretch and stamp the metal material respectively. It is impossible to complete the stretching and stamping of the metal material with one device. Summary of the invention

[0004] The present application provides a hydraulic press for stretching metal materials, which can perform stretching treatment on metal materials before stamping the metal materials.

[0005] The present application provides a hydraulic press for metal material stretching, which adopts the following technical solution: A hydraulic press for stretching metal materials, comprising a machine body, a movable table slidably connected to the machine body in a vertical direction, an oil cylinder arranged on the machine body and connected to the movable table, a workbench arranged on the machine body, and a mold fixing seat arranged on the workbench, wherein two sliding grooves are provided on the workbench, and the two sliding grooves are respectively located on both sides of the mold fixing seat; a first stretching block is slidably connected in the sliding groove in a horizontal direction, a first spring is provided in the sliding groove, and the elastic force of the first spring acts on the first stretching block, and the first spring always drives the first stretching block to move toward the mold fixing seat; a second stretching block is slidably connected to the first stretching block in a vertical direction, and a placement cavity for placing metal materials is formed between the first stretching block and the second stretching block; The first stretching block is provided with a second spring, and the elastic force of the second spring acts on the second stretching block, and the second spring is used to drive the second stretching block to move away from the first stretching block; two columns are provided on the workbench, and two limit blocks are connected to the two columns for sliding in the vertical direction, and the two limit blocks are respectively located on both sides of the two second stretching blocks and respectively abut against the two second stretching blocks; the workbench is also provided with two groups of limiting mechanisms for limiting the sliding of the limit blocks; two push blocks are provided on the movable table, and a first inclined surface is provided on one end of the two second stretching blocks that are close to each other, and the two push blocks respectively abut against the two first inclined surfaces, and the push block presses the first inclined surface to move the second stretching block to the bottom of the limit block.

[0006] By adopting the above technical solution, the metal material is stretched and fixed by the two first stretching blocks and the two second stretching blocks before the metal material is stamped, so as to prevent displacement of the metal material during subsequent stamping.

[0007] Preferably, the limiting mechanism includes a mounting groove provided on the column, a limiting rod connected to the mounting groove for sliding in a horizontal direction, a limiting hole provided on the limiting block, and a driving assembly for controlling the sliding of the limiting rod, wherein the limiting rod is inserted in the limiting hole.

[0008] By adopting the above technical solution, during the descent of the movable platform, the two groups of driving components control the two limit rods to be inserted into the two limit holes to prevent the two limit blocks from moving and ensure the pressure of the two second stretching blocks on the metal material. After the metal material is stamped, the two groups of driving components drive the two limit rods to move into the two installation slots, canceling the sliding restriction of the two limit blocks by the two limit rods. After the sliding restriction of the two limit blocks is canceled, the multiple second springs will rebound and drive the two second stretching blocks and the two limit blocks to move upward, so that the two second stretching blocks no longer press the metal material. When the two first stretching blocks move out from under the two limit blocks, the two limit blocks will reset due to gravity so that the installation slots are aligned with the limit holes, and then the driving component drives the limit rods to slide into the limit holes again to restrict the movement of the limit blocks.

[0009] Preferably, the driving assembly includes a third spring arranged in the installation groove, a pull rope connected to the limit rod, a first rotating rod rotatably connected to the workbench, and a first driving part for driving the first rotating rod to rotate, the elastic force of the third spring acts on the limit rod, and the third spring is used to drive the limit rod to move away from the installation groove; the pull rope extends out of the column and is connected to the first rotating rod.

[0010] By adopting the above technical solution, when there is no external force, the two third springs always press the two limit rods into the two limit holes to ensure that the two limit rods limit the positions of the two limit blocks. After the metal material is stamped, the two first driving parts drive the two first rotating rods to rotate, and the two first rotating rods rotate to wrap around the two limit rods and move into the two installation grooves, thereby canceling the sliding restriction of the two limit rods on the two limit blocks.

[0011] Preferably, the first driving part includes a first one-way bearing arranged on the first rotating rod; the reverse rotation of the outer ring of the first one-way bearing will drive the inner ring of the first one-way bearing and the first rotating rod to rotate, and the push block contacts the outer ring of the first one-way bearing and drives the outer ring of the first one-way bearing to rotate forward during the process of descending along the first stretching block; the push block contacts the outer ring of the first one-way bearing and drives the outer ring of the first one-way bearing to rotate forward during the process of ascending along the first stretching block.

[0012] By adopting the above technical solution, the outer rings of the two first one-way bearings are driven to reverse during the upward movement of the two push blocks, thereby driving the inner rings of the two first one-way bearings and the two first rotating rods to reverse. When the two first rotating rods reverse, two pull ropes will be wound to pull the two limit rods into the two installation slots and compress the two third springs. After the two limit rods move into the two installation slots, the multiple second springs will rebound to drive the two second stretching blocks and the two push blocks to move upward. When the two push blocks subsequently move to be separated from the two first one-way bearings, the two third springs rebound to drive the two limit rods to move out of the installation slots and press the two limit rods against the two limit blocks. When the two second stretching blocks subsequently move to no longer below the two limit blocks, the two limit blocks will be reset due to gravity so that the two installation slots are aligned with the two limit holes, and the two third springs rebound to push the two limit rods into the two limit holes, so that the two limit rods limit the sliding of the two limit blocks again.

[0013] Preferably, the first stretching block is slidably connected to a top plate in a vertical direction, and a plurality of ejector pins are provided on the top plate. In an initial state, one end of the plurality of ejector pins away from the top plate is flush with the top surface of the first stretching block; the second stretching block is provided with a driving mechanism for driving the top plate to reciprocate up and down.

[0014] By adopting the above technical solution, after the two second stretching blocks cancel the pressure on the metal material, the driving mechanism drives the top plate to slide downward so that multiple ejector pins push up the metal material, thereby completing the demolding of the metal material from the lower die of the stamping die and the separation of the metal material from the two first stretching blocks, making it convenient for the staff to take the metal material after stretching and stamping.

[0015] Preferably, the driving mechanism includes a second rotating rod rotatably connected to the second stretching block, a connecting disk arranged on the second rotating rod, a crank hinged at both ends on the connecting disk and the top plate, and a second driving part for driving the second rotating rod to rotate.

[0016] By adopting the above technical solution, the second driving part drives the second rotating rod to rotate, thereby driving the connecting disk to rotate one circle. When the connecting disk rotates, it drives the top plate to slide downward through the crank.

[0017] Preferably, the second driving part includes a second one-way bearing sleeved on the second rotating rod, the diameter of the second one-way bearing is larger than the diameter of the connecting plate, and the outer ring of the second one-way bearing is in conflict with the bottom wall of the sliding groove; when the outer ring of the second one-way bearing is reversed, the inner ring of the second one-way bearing is driven to rotate; when the first stretching block moves away from the mold fixing seat, the outer ring of the second one-way bearing rotates forward; when the first stretching block moves close to the mold fixing seat, the outer ring of the second one-way bearing reverses.

[0018] By adopting the above technical solution, when the two first stretching blocks move towards each other and reset, the outer rings of the two second one-way bearings will reverse, thereby driving the inner rings of the two second one-way bearings and the two second rotating rods to rotate.

[0019] The technical effects of the present invention are mainly reflected in the following aspects: 1. The present invention can perform stretching treatment on metal materials before stamping them; 2. The present invention can limit the position of metal materials during metal material stamping operations; 3. The present invention can complete the demoulding of metal materials after the metal material stamping operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the hydraulic press of this application.

[0021] Figure 2 yes Figure 1 Cross-sectional view of the hydraulic press along line AA.

[0022] Figure 3 yes Figure 2 A partial enlarged view of point B in the middle.

[0023] Figure 4 yes Figure 1 Schematic diagram of part of the structure of the restriction mechanism.

[0024] Figure 5 yes Figure 1 Cross-sectional view of the hydraulic press along line CC.

[0025] Figure 6 yes Figure 5 A partial enlarged view of point D in the middle.

[0026] Figure 7 yes Figure 2 A schematic diagram of the structure when the second stretching block moves down to the point where the top surface is flush with the bottom surface of the limit block.

[0027] Figure 8 yes Figure 2 A schematic diagram of the structure when the middle push block moves downward to no longer fit the first inclined surface.

[0028] Fig. 9 yes Figure 2 Schematic diagram of the structure of the stamping die during stamping.

[0029] Fig.10 yes Figure 2 A schematic diagram of the structure when the second spring lifts up the second stretching block and the limit block after the middle stamping die is closed for stamping.

[0030] Fig.11 yes Fig.10A schematic diagram of the structure when the middle push block moves and returns to fit with the first inclined surface.

[0031] 1. Machine body; 11. movable table; 12. oil cylinder; 13. workbench; 14. mold fixing seat; 15. sliding groove; 151. guide rod; 16. first spring; 17. placement cavity; 18. column; 2. first stretching block; 21. sliding rod; 22. second spring; 3. second stretching block; 31. first inclined plane; 4. limit block; 5. limiting mechanism; 51. mounting groove; 52. limit rod; 53. limit hole; 54. driving assembly; 55. third spring; 56. pull rope; 57. first rotating rod; 58. first driving part; 581. first one-way bearing; 6. push block; 71. ejector plate; 72. ejector pin; 8. driving mechanism; 81. second rotating rod; 82. connecting plate; 83. crank; 84. second driving part; 841. second one-way bearing;. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings to make the technical solution of the present application easier to understand and grasp.

[0033] Reference Figure 1 and Figure 2 The hydraulic press for metal material stretching of the present embodiment comprises a machine body 1, a movable table 11 connected to the machine body 1 in a vertical sliding direction, an oil cylinder 12 installed on the machine body 1 and connected to the movable table 11, a work table 13 fixed on the machine body 1, and a mold fixing seat 14 fixed at the center of the work table 13. The movable table 11 is located directly above the mold fixing seat 14, and the rise and fall of the movable table 11 can be controlled by controlling the extension and contraction of the output shaft of the oil cylinder 12.

[0034] Reference Figure 2 Two sliding grooves 15 are provided on the workbench 13, and the two sliding grooves 15 are respectively located on both sides of the mold fixing seat 14; the first stretching block 2 is slidably connected in the horizontal direction in both sliding grooves 15. Several guide rods 151 are installed in each sliding groove 15, and the several guide rods 151 all penetrate the first stretching block 2 to limit the sliding of the first stretching block 2.

[0035] Reference Figure 1 and Figure 2, each guide rod 151 is sleeved with a first spring 16. The multiple first springs 16 in the same sliding groove 15 are all located on the side of the first stretching block 2 in the same sliding groove 15 away from the mold fixing seat 14. The elastic forces of the multiple first springs 16 in the same sliding groove 15 all act on the first stretching block 2 in the same sliding groove 15. The multiple first springs 16 in the same sliding groove 15 always drive the first stretching block 2 in the same sliding groove 15 to move toward the mold fixing seat 14. In the initial state, the multiple first springs 16 in the same sliding groove 15 press the first stretching block 2 in the same sliding groove 15 against the side wall of the sliding groove 15 close to the mold fixing seat 14.

[0036] Reference Figure 1 and Figure 2 , sliding rods 21 are fixed on both ends of the top of the first stretching block 2, and a second stretching block 3 is arranged above the first stretching block 2. Both ends of the second stretching block 3 are respectively connected to the two sliding rods 21 by sliding in the vertical direction, and each sliding rod 21 is sleeved with a second spring 22. The elastic force of the second spring 22 acts on the second stretching block 3, and the second spring 22 is used to drive the second stretching block 3 to move away from the first stretching block 2. In the initial state, a placement cavity 17 for placing metal materials is formed between the first stretching block 2 and the second stretching block 3.

[0037] Reference Figure 1 and Figure 2 Two columns 18 are fixed on both sides of the workbench 13, and two first stretching blocks 2 are located between the four columns 18. The four columns 18 are connected to the limit blocks 4 by sliding along the vertical direction on one side close to the adjacent first stretching blocks 2, and the two second stretching blocks 3 are located between the four limit blocks 4. In the initial state, the side of the stretching block away from the column 18 is attached to and abutted against the adjacent second stretching block 3.

[0038] Reference Figure 1 and Figure 2 Four push blocks 6 are fixed on one side of the movable table 11 close to the workbench 13, of which two push blocks 6 form a group, and the two groups of push blocks 6 are respectively located on both sides of the movable table 11. A second stretching block 3 is located between the two limit blocks 4 and the two push blocks 6 on the same side. The two second stretching blocks 3 are provided with a first inclined surface 31 on one end close to each other, and the inclination directions of the two first inclined surfaces 31 are opposite. The bottom ends of the two push blocks 6 on the same side are respectively abutted against the two side ends of the first inclined surface 31 on the same side, and the push block 6 moves the second stretching block 3 to the bottom of the limit block 4 by pressing the first inclined surface 31.

[0039] Reference Figure 1-Figure 4, the workbench 13 is also provided with four sets of limiting mechanisms 5 for limiting the sliding movement of the limit block 4. The limiting mechanisms 5 include a mounting groove 51 provided on the column 18, a limiting rod 52 connected to the mounting groove 51 in a horizontal sliding direction, a limiting hole 53 provided on the limit block 4, and the limiting rod 52 inserted into the limiting hole 53. At the beginning, the limit block 4 is located at the lowest point of its sliding track, and at this time, the mounting groove 51 is directly opposite to the limiting hole 53.

[0040] Reference Figure 1-Figure 4 The limiting mechanism 5 also includes a driving assembly 54 for controlling the sliding movement of the limiting rod 52. The driving assembly 54 includes a third spring 55 placed in the installation slot 51, a pull rope 56 connected to the limiting rod 52, and a first rotating rod 57 rotatably connected to the workbench 13. The third spring 55 is located on the side of the limiting rod 52 away from the limiting block 4. The elastic force of the third spring 55 acts on the limiting rod 52. The third spring 55 is used to drive the limiting rod 52 to move away from the installation slot 51. At the beginning, the third spring 55 presses the limiting rod 52 against the limiting hole 53. One end of the pull rope 56 away from the limiting rod 52 passes through the third spring 55 and extends out of the column 18. One end of the pull rope 56 extending out of the column 18 is fixed to the first rotating rod 57.

[0041] Reference Figure 1-Figure 4 , the driving assembly 54 also includes a first driving part 58 for driving the first rotating rod 57 to rotate. The first driving part 58 includes a first one-way bearing 581 mounted on the first rotating rod 57, and an anti-slip rubber ring is sleeved on the outer ring of the first one-way bearing 581. The reverse rotation of the outer ring of the first one-way bearing 581 will drive the inner ring of the first one-way bearing 581 and the first rotating rod 57 to rotate; the push block 6 contacts the outer ring of the first one-way bearing 581 and drives the outer ring of the first one-way bearing 581 to rotate forward during the process of descending against the first stretching block 2; the push block 6 contacts the outer ring of the first one-way bearing 581 and drives the outer ring of the first one-way bearing 581 to rotate forward during the process of ascending against the first stretching block 2.

[0042] Reference Figure 1 , Figure 5 and Figure 6 A top plate 71 is slidably connected to the first stretching block 2 in the vertical direction, and a plurality of ejector pins 72 are provided on the top plate 71. In the initial state, one end of the plurality of ejector pins 72 away from the top plate 71 is flush with the top surface of the first stretching block 2; a driving mechanism 8 for driving the top plate 71 to reciprocate up and down is installed on the second stretching block 3.

[0043] Reference Figure 1 , Figure 5 and Figure 6 The driving mechanism 8 includes a second rotating rod 81 rotatably connected to the second stretching block 3, a connecting plate 82 coaxially fixedly connected to the second rotating rod 81, and a crank 83 whose two ends are respectively hinged on the connecting plate 82 and the top plate 71.

[0044] Reference Figure 1 , Figure 5 and Figure 6 The driving mechanism 8 also includes a second driving part 84 for driving the second rotating rod 81 to rotate. The second driving part 84 includes a second one-way bearing 841 sleeved on the second rotating rod 81, and an anti-slip rubber ring is sleeved on the outer ring of the second one-way bearing 841. The diameter of the second one-way bearing 841 is larger than the diameter of the connecting plate 82, and the outer ring of the second one-way bearing 841 is in conflict with the bottom wall of the sliding groove 15; when the outer ring of the second one-way bearing 841 is reversed, the inner ring of the second one-way bearing 841 is driven to rotate; when the first stretching block 2 moves away from the mold fixing seat 14, the outer ring of the second one-way bearing 841 rotates forward; when the first stretching block 2 moves close to the mold fixing seat 14, the outer ring of the second one-way bearing 841 is reversed.

[0045] The stretching and stamping steps of the hydraulic press of this application are as follows: Reference Figure 2 When the hydraulic press is used, the upper die of the stamping die is first installed on the bottom of the movable table 11, and the lower die of the stamping die is installed on the die fixing seat 14. Then the two ends of the metal material are placed in the two placement cavities 17, and the stamping part of the metal material is located between the upper and lower dies of the stamping die.

[0046] Reference Figure 2 and Figure 7 , and then start the oil cylinder 12 to extend the piston rod of the oil cylinder 12 to drive the movable platform 11 to descend. When the movable platform 11 descends, the four push blocks 6 will push the two second stretching blocks 3 to move toward the first stretching block 2 and make the four second springs 22 compressed. Because of the existence of the four limit blocks 4, the four push blocks 6 will not push the two first stretching blocks 2 to move when pushing the two second stretching blocks 3 to move at the beginning.

[0047] Reference Figure 7 and Figure 8 When the two second stretching blocks 3 move to press the metal material, the two second stretching blocks 3 move until their top surfaces are flush with the bottom surfaces of the four limit blocks 4. Subsequently, the two push blocks 6 will continue to move downward and push the two first stretching blocks 2 and the two second stretching blocks 3 to move away from each other, thereby stretching the metal material. When the two second stretching blocks 3 move away from each other, they will move below the two limit blocks 4 and collide with the four limit blocks 4. The four limit blocks 4 ensure the stability of the two second stretching blocks 3 pressing the metal material.

[0048] Reference Figure 7 and Figure 8When the two first stretching blocks 2 move away from each other, the multiple first springs 16 in the two sliding grooves 15 are compressed. After the two push blocks 6 move to no longer contact the two first inclined surfaces 31, the two first stretching blocks 2 stop moving and the two push blocks 6 move to fit with the side of the two first stretching blocks 2 that is close to each other.

[0049] Reference Fig. 9 , the four push blocks 6 and the upper die of the stamping die will continue to descend under the action of the workbench 13. During the descent of the four push blocks 6, the four push blocks 6 will contact the outer rings of the four first one-way bearings 581 and drive the outer rings of the four first one-way bearings 581 to rotate forward, and finally the stamping die will stamp the metal material. When the stamping die stamps the metal material, the two first stretching blocks 2 and the two second stretching blocks 3 will clamp the metal material to prevent the displacement of the metal material.

[0050] Reference Figure 2 , Figure 3 , Figure 4 and Fig.10 After the metal material is stamped, the piston rod of the oil cylinder 12 retracts to drive the movable table 11 to move upward, and the movable table 11 moves upward with the upper die of the stamping die and the four push blocks 6. The four push blocks 6 move upward along the two first stretching blocks 2, which drives the outer rings of the four first one-way bearings 581 to reverse, thereby driving the inner rings of the four first one-way bearings 581 and the four first rotating rods 57 to reverse.

[0051] Reference Figure 2 , Figure 3 , Figure 4 and Fig.10 When the four first rotating rods 57 are reversed, the four pull ropes 56 will be wound around them, thereby pulling the four limiting rods 52 into the four installation slots 51 and causing the four third springs 55 to be compressed. After the four limiting rods 52 move into the four installation slots 51, the four second springs 22 will rebound and drive the two second stretching blocks 3 and the four push blocks 6 to move upward, so that the two second stretching blocks 3 no longer press the metal material. When the four push blocks 6 move to disengage from the four first one-way bearings 581, the four third springs 55 rebound and drive the two limiting rods 52 to move out of the installation slots 51, pressing the four limiting rods 52 against the four limiting blocks 4, and causing the four first rotating rods 57 to rotate.

[0052] Reference Fig.10 , Fig.11 , the four push blocks 6 continue to move upward. When the four push blocks 6 move up to fit the first inclined surface 31, the multiple first springs 16 will rebound and drive the two first stretching blocks 2 to move closer to each other as the four push blocks 6 move upward. When the two first stretching blocks 2 move closer to each other, they will bring the two second stretching blocks 3 to move closer to each other so that the two first inclined surfaces 31 always rest against the adjacent push blocks 6.

[0053] Reference Figure 2 and Figure 3 When the two second stretching blocks 3 move to a point where they are no longer below the four limit blocks 4, the four limit blocks 4 will move downward due to gravity to reset so that the four mounting slots 51 are aligned with the four limit holes 53, and the four third springs 55 rebound to push the four limit rods 52 into the four limit holes 53, so that the four limit rods 52 again limit the sliding of the four limit blocks 4. Subsequently, as the two push blocks 6 move upward, the multiple second springs 22 will also push the two second stretching blocks 3 to continue to move upward a certain distance, and finally the two push blocks 6 and the two second stretching blocks 3 move and reset.

[0054] Reference Figure 5 , Figure 6 and Fig.11 When the two first stretching blocks 2 move toward each other and reset, the outer rings of the two second one-way bearings 841 will reverse, thereby driving the inner rings of the two second one-way bearings 841 and the two second rotating rods 81 to rotate one circle. The two second rotating rods 81 rotate, thereby driving the two connecting plates 82 to rotate one circle. When the two connecting plates 82 rotate, they will drive the two top plates 71 to slide up and down through the two cranks 83. The two top plates 71 slide up and down so that the multiple ejector pins 72 push the metal material up, thereby completing the demoulding of the metal material and the lower die of the stamping die and the separation of the metal material from the two first stretching blocks 2, making it convenient for the staff to take the metal material after stretching and stamping.

[0055] After all parts have been moved and reset, the staff can take away the metal material that has been stretched and stamped, put new metal material into the two placement chambers 17, and restart the hydraulic press to perform stretching and stamping operations on the new metal material.

[0056] Of course, the above are only typical examples of the present application. In addition, the present application may have many other specific implementation methods. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present application.

Claims

1. A hydraulic press for stretching metal materials, comprising a machine body (1), a movable table (11) slidably connected to the machine body (1) in a vertical direction, a cylinder (12) provided on the machine body (1) and connected to the movable table (11), a work table (13) provided on the machine body (1), and a mold fixing seat (14) provided on the work table (13), characterized in that: The workbench (13) is provided with two sliding grooves (15), and the two sliding grooves (15) are respectively located on both sides of the mold fixing seat (14); a first stretching block (2) is slidably connected in the sliding groove (15) along the horizontal direction, and a first spring (16) is provided in the sliding groove (15), and the elastic force of the first spring (16) acts on the first stretching block (2), and the first spring (16) always drives the first stretching block (2) to move toward the mold fixing seat (14); a second stretching block (3) is slidably connected to the first stretching block (2) along the vertical direction, and a placement cavity (17) for placing metal materials is formed between the first stretching block (2) and the second stretching block (3); a second spring (22) is provided on the first stretching block (2), and the elastic force of the second spring (22) acts on the second stretching block (3), and the first The two springs (22) are used to drive the second stretching block (3) to move away from the first stretching block (2); the workbench (13) is provided with two columns (18), and the two columns (18) are both connected with two limit blocks (4) in a sliding manner in the vertical direction, and the two limit blocks (4) are respectively located on the two sides of the two second stretching blocks (3) and respectively abut against the two second stretching blocks (3); the workbench (13) is also provided with two groups of limiting mechanisms (5) for limiting the sliding of the limit blocks (4); the movable table (11) is provided with two push blocks (6), and the ends of the two second stretching blocks (3) that are close to each other are both provided with a first inclined surface (31), and the two push blocks (6) are respectively abutted against the two first inclined surfaces (31), and the push blocks (6) press the first inclined surface (31) to move the second stretching block (3) to the bottom of the limit block (4).

2. A hydraulic press for drawing metal materials according to claim 1, characterized in that: The limiting mechanism (5) comprises a mounting groove (51) provided on the column (18), a limiting rod (52) connected to the mounting groove (51) in a horizontal sliding direction, a limiting hole (53) provided on the limiting block (4), and a driving assembly (54) for controlling the sliding of the limiting rod (52), wherein the limiting rod (52) is inserted into the limiting hole (53).

3. A hydraulic press for drawing metal materials according to claim 2, characterized in that: The driving assembly (54) comprises a third spring (55) arranged in the installation groove (51), a pull rope (56) connected to the limiting rod (52), a first rotating rod (57) rotatably connected to the workbench (13), and a first driving part (58) for driving the first rotating rod (57) to rotate, the elastic force of the third spring (55) acts on the limiting rod (52), and the third spring (55) is used to drive the limiting rod (52) to move away from the installation groove (51); the pull rope (56) extends out of the column (18) and is connected to the first rotating rod (57).

4. A hydraulic press for drawing metal materials according to claim 3, characterized in that: The first driving part (58) comprises a first one-way bearing (581) arranged on the first rotating rod (57); the reverse rotation of the outer ring of the first one-way bearing (581) drives the inner ring of the first one-way bearing (581) and the first rotating rod (57) to rotate; when the push block (6) descends along the first stretching block (2), it contacts the outer ring of the first one-way bearing (581) and drives the outer ring of the first one-way bearing (581) to rotate forward; when the push block (6) ascends along the first stretching block (2), it contacts the outer ring of the first one-way bearing (581) and drives the outer ring of the first one-way bearing (581) to rotate forward.

5. A hydraulic press for drawing metal materials according to claim 1, characterized in that: The first stretching block (2) is slidably connected to a top plate (71) in a vertical direction, and a plurality of ejector pins (72) are provided on the top plate (71). In an initial state, ends of the plurality of ejector pins (72) away from the top plate (71) are flush with the top surface of the first stretching block (2); and the second stretching block (3) is provided with a driving mechanism (8) for driving the top plate (71) to reciprocate up and down.

6. A hydraulic press for stretching metal materials according to claim 5, characterized in that: The driving mechanism (8) comprises a second rotating rod (81) rotatably connected to the second stretching block (3), a connecting disk (82) provided on the second rotating rod (81), a crank (83) with two ends respectively hinged on the connecting disk (82) and the top plate (71), and a second driving part (84) for driving the second rotating rod (81) to rotate.

7. A hydraulic press for drawing metal materials according to claim 6, characterized in that: The second driving part (84) comprises a second one-way bearing (841) sleeved on the second rotating rod (81); the diameter of the second one-way bearing (841) is larger than the diameter of the connecting plate (82); the outer ring of the second one-way bearing (841) is in contact with the bottom wall of the sliding groove (15); when the outer ring of the second one-way bearing (841) is reversed, the inner ring of the second one-way bearing (841) is driven to rotate; when the first stretching block (2) moves away from the mold fixing seat (14), the outer ring of the second one-way bearing (841) rotates forward; when the first stretching block (2) moves close to the mold fixing seat (14), the outer ring of the second one-way bearing (841) is reversed.

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