Hydraulic machine for metal material stretching

Abstract

The application relates to a hydraulic machine for metal material stretching, which comprises a machine body, a movable table, an oil cylinder, a workbench and a die fixing base, a first stretching block is slidably connected to the workbench in the horizontal direction, a first spring is arranged on the workbench, the first spring always drives the first stretching block to move towards the die fixing base, a second stretching block is slidably connected to the first stretching block, a second spring is arranged on the first stretching block and used for driving the second stretching block to move away from the first stretching block, two vertical columns are arranged on the workbench, a limiting block is slidably connected to the vertical column, two pushing blocks are arranged on the movable table, one side of each of the two second stretching blocks is a first inclined surface, and the two pushing blocks respectively abut against the two first inclined surfaces. The application can stretch the metal material before stamping.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of stretching machinery, in particular to a hydraulic machine for stretching metal materials. BACKGROUND

[0002] Hydraulic machines are widely used in heavy industry production, and most of the commonly used hydraulic machines can only be used for pressing at most of the time, and have single function.

[0003] In the process of forming metal parts with complex structures, the metal material needs to be stretched, and the plasticity of the metal material is improved through stretching treatment, so that the metal material is more easily formed by stamping, and the problems of breaking and deformation are reduced. The existing production process is to use two hydraulic machines to stretch and stamp the metal material respectively, and it is impossible to complete the stretching and stamping of the metal material with one device. SUMMARY

[0004] The present application provides a hydraulic machine for stretching metal materials, which can stretch the metal material before stamping.

[0005] The hydraulic machine for stretching metal materials provided by the present application adopts the following technical scheme:

[0006] A hydraulic machine for stretching metal materials, comprising a machine body, a movable table slidingly connected to the machine body in the vertical direction, an oil cylinder connected to the movable table and arranged on the machine body, a workbench arranged on the machine body, and a die fixing seat arranged on the workbench, wherein two sliding grooves are formed in the workbench, and the two sliding grooves are located on the two sides of the die fixing seat; a first stretching block is slidingly connected in the horizontal direction in the sliding groove, a first spring is arranged in the sliding groove, 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 towards the die fixing seat; a second stretching block is slidingly connected to the first stretching block in the vertical direction, and a placement cavity for placing metal materials is formed between the first stretching block and the second stretching block; a second spring is arranged on the first stretching block, 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 vertical columns are arranged on the workbench, two limiting blocks are slidingly connected to the vertical columns in the vertical direction, and the two limiting blocks are located on the two sides of the two second stretching blocks and abut against the two second stretching blocks, respectively; two sets of limiting mechanisms for limiting the sliding of the limiting blocks are further arranged on the workbench; two push blocks are arranged on the movable table, a first inclined surface is formed on one end of each of the two second stretching blocks, and the two push blocks abut against the two first inclined surfaces, respectively; the push blocks press against the first inclined surfaces to move the second stretching blocks to the lower side of the limiting blocks.

[0007] By adopting the technical scheme, the metal material is stretched and fixed by the two first stretching blocks and the two second stretching blocks before stamping, so that displacement during subsequent stamping of the metal material is prevented.

[0008] Preferably, the limiting mechanism comprises a mounting slot formed on the stand, a limiting rod slidingly connected in the mounting slot in a horizontal direction, a limiting hole formed on the limiting block, and a driving assembly for controlling sliding of the limiting rod, wherein the limiting rod is inserted into the limiting hole.

[0009] By adopting the technical scheme, the two limiting rods are inserted into the two limiting holes during the descending process of the movable table, so that movement of the two limiting blocks is prevented and the pressing force of the two second stretching blocks on the metal material is ensured. After stamping of the metal material, the two driving assemblies drive the two limiting rods to move into the two mounting slots, so that sliding of the two limiting blocks is cancelled. After the sliding of the two limiting blocks is cancelled, the multiple second springs rebound to drive the two second stretching blocks and the two limiting blocks to move upwards, so that the two second stretching blocks no longer press the metal material. When the two first stretching blocks move out of the lower side of the two limiting blocks, the two limiting blocks are reset due to gravity, so that the mounting slot and the limiting hole are aligned, and then the driving assembly drives the limiting rod to slide into the limiting hole to limit the movement of the limiting block.

[0010] Preferably, the driving assembly comprises a third spring arranged in the mounting slot, a pull rope connected with the limiting rod, a first rotating rod rotatably connected with the workbench, and a first driving part for driving the first rotating rod to rotate, wherein the elastic force of the third spring acts on the limiting rod, and the third spring is used for driving the limiting rod to move away from the mounting slot; and the pull rope extends out of the stand and is connected with the first rotating rod.

[0011] By adopting the technical scheme, the two third springs always press the two limiting rods in the two limiting holes without external force, so that the position of the two limiting blocks is limited by the two limiting rods.

[0012] Preferably, the first driving part comprises a first one-way bearing arranged on the first rotating rod; the outer ring of the first one-way bearing is reversed to drive the inner ring of the first one-way bearing and the first rotating rod to rotate; the push block contacts the outer ring of the first one-way bearing during the descending process of the first stretching block and drives the outer ring of the first one-way bearing to rotate in the positive direction; and the push block contacts the outer ring of the first one-way bearing during the ascending process of the first stretching block and drives the outer ring of the first one-way bearing to rotate in the positive direction.

[0013] By adopting the technical scheme, the outer rings of the two first one-way bearings are reversed during the ascending 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, the two pull ropes are wound, thereby pulling the two limiting rods into the two installation grooves and making the two third springs compress under stress. After the two limiting rods move into the two installation grooves, the multiple second springs rebound to drive the two second stretching blocks and the two push blocks to move upwards. When the two push blocks move to be separated from the two first one-way bearings, the two third springs rebound to drive the two limiting rods to move out of the installation grooves and press the two limiting rods against the two limiting blocks. When the two second stretching blocks move to be not below the two limiting blocks, the two limiting blocks move downwards to reset due to gravity, the two installation grooves are aligned with the two limiting holes, and the two third springs rebound to push the two limiting rods into the two limiting holes, so that the two limiting rods limit the sliding of the two limiting blocks again.

[0014] Preferably, a top plate is connected to the first stretching block in a sliding manner along a vertical direction, and multiple top pins are arranged on the top plate. In an initial state, the ends of the multiple top pins away from the top plate are flush with the top surface of the first stretching block. A driving mechanism is arranged on the second stretching block to drive the top plate to move up and down in a reciprocating manner.

[0015] By adopting the technical scheme, after the two second stretching blocks cancel the pressing on the metal material, the driving mechanism drives the top plate to slide up and down, so that the multiple top pins push the metal material upwards, thereby completing the demolding of the metal material from the lower die of the stamping die and the disengagement of the metal material from the two first stretching blocks, and facilitating the staff to take the stretched and stamped metal material.

[0016] Preferably, the driving mechanism comprises a second rotating rod rotatably connected to the second stretching block, a connecting disc arranged on the second rotating rod, a crank hingedly connected to the connecting disc and the top plate at two ends, and a second driving part for driving the second rotating rod to rotate.

[0017] By adopting the technical scheme, the second driving part drives the second rotating rod to rotate, thereby driving the connecting disc to rotate one circle. When the connecting disc rotates, the crank drives the top plate to slide up and down.

[0018] Preferably, the second driving part comprises a second one-way bearing sleeved on the second rotating rod, the diameter of the second one-way bearing is greater than the diameter of the connecting disc, and the outer ring of the second one-way bearing abuts against the bottom wall of the sliding groove. When the outer ring of the second one-way bearing reverses, the inner ring of the second one-way bearing rotates. When the first stretching block moves away from the die fixing base, the outer ring of the second one-way bearing rotates forward. When the first stretching block moves close to the die fixing base, the outer ring of the second one-way bearing reverses.

[0019] By adopting the technical scheme, when the two first stretching blocks move close to reset, the outer rings of the two second one-way bearings are reversed to drive the inner rings of the two second one-way bearings and the two second rotating rods to rotate.

[0020] The technical effects of the present application mainly embody in the following aspects:

[0021] 1. The present application can stretch the metal material before stamping;

[0022] 2. The present application can limit the metal material during stamping operation;

[0023] 3. The present application can complete the demolding of the metal material after stamping operation. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of the hydraulic machine in the present application.

[0025] Figure 2 is Figure 1 is a sectional view of the hydraulic machine along A-A line in the present application.

[0026] Figure 3 is Figure 2 is an enlarged view of B in the present application.

[0027] Figure 4 is Figure 1 is a partial structural schematic diagram of the limiting mechanism in the present application.

[0028] Figure 5 is Figure 1 is a sectional view of the hydraulic machine along C-C line in the present application.

[0029] Figure 6 is Figure 5 is an enlarged view of D in the present application.

[0030] Figure 7 is Figure 2 is a structural schematic diagram of the present application when the second stretching block is lowered to the top surface flush with the bottom surface of the limiting block.

[0031] Figure 8 is Figure 2 is a structural schematic diagram of the present application when the push block is lowered to no longer fit the first inclined surface.

[0032] Figure 9 is Figure 2 is a structural schematic diagram of the present application when the stamping die is closed for stamping.

[0033] Figure 10 is Figure 2 is a structural schematic diagram of the present application when the second spring lifts the second stretching block and the limiting block after the stamping die is closed for stamping.

[0034] Figure 11 is Figure 10 Structure diagram of the pushing block moving back to fit with the first inclined surface.

[0035] Fig. 1 is a machine body; 11 is a movable table; 12 is an oil cylinder; 13 is a workbench; 14 is a mold fixing base; 15 is a sliding groove; 151 is a guide rod; 16 is a first spring; 17 is a placing cavity; 18 is a stand column; 2 is a first stretching block; 21 is a sliding rod; 22 is a second spring; 3 is a second stretching block; 31 is a first inclined surface; 4 is a limiting block; 5 is a limiting mechanism; 51 is a mounting groove; 52 is a limiting rod; 53 is a limiting hole; 54 is a driving assembly; 55 is a third spring; 56 is a pulling rope; 57 is a first rotating rod; 58 is a first driving part; 581 is a first one-way bearing; 6 is a pushing block; 71 is a top plate; 72 is a thimble; 8 is a driving mechanism; 81 is a second rotating rod; 82 is a connecting disc; 83 is a crank; 84 is a second driving part; 841 is a second one-way bearing. DETAILED DESCRIPTION

[0036] The application will be further described in detail below with reference to the drawings, so that the technical scheme of the application is easier to understand and master.

[0037] With reference to Figure 1 and Figure 2 , the hydraulic machine for stretching metal material of the embodiment includes a machine body 1, a movable table 11 slidingly connected to the machine body 1 in the vertical direction, an oil cylinder 12 mounted on the machine body 1 and connected to the movable table 11, a workbench 13 fixed on the machine body 1, and a mold fixing base 14 fixed at the center of the workbench 13. The movable table 11 is located directly above the mold fixing base 14, and the rising and falling of the movable table 11 can be controlled by controlling the extension and retraction of the output shaft of the oil cylinder 12.

[0038] With reference to Figure 2 , two sliding grooves 15 are formed on the workbench 13, and the two sliding grooves 15 are respectively located on the two sides of the mold fixing base 14. A first stretching block 2 is slidingly connected in the horizontal direction in each of the two sliding grooves 15. Several guide rods 151 are mounted 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.

[0039] With reference to Figure 1 and Figure 2A first spring 16 is sleeved on each guide rod 151. The first springs 16 in the same sliding groove 15 are located on the side of the first stretching blocks 2 in the same sliding groove 15 away from the mold fixing base 14. The elastic force of the first springs 16 in the same sliding groove 15 acts on the first stretching blocks 2 in the same sliding groove 15. The first springs 16 in the same sliding groove 15 always drive the first stretching blocks 2 in the same sliding groove 15 to move towards the mold fixing base 14. In the initial state, the first springs 16 in the same sliding groove 15 press the first stretching blocks 2 in the same sliding groove 15 against the side wall of the sliding groove 15 close to the mold fixing base 14.

[0040] With reference to Figure 1 and Figure 2 , the top ends of the first stretching blocks 2 are fixed with sliding rods 21, and the upper side of the first stretching blocks 2 is provided with second stretching blocks 3, the two ends of each second stretching block 3 are slidably connected to the two sliding rods 21 in the vertical direction, and a second spring 22 is sleeved on each sliding rod 21. 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, the first stretching block 2 and the second stretching block 3 form a placement cavity 17 for placing metal materials.

[0041] With reference to Figure 1 and Figure 2 , the two sides of the workbench 13 are respectively fixed with two vertical columns 18, and the two first stretching blocks 2 are located between the four vertical columns 18. The vertical columns 18 are respectively provided with limiting blocks 4 on the side close to the adjacent first stretching blocks 2 in the vertical direction, and the two second stretching blocks 3 are located between the four limiting blocks 4. In the initial state, the side of the stretching block away from the vertical column 18 is in close contact with the adjacent second stretching block 3.

[0042] With reference to Figure 1 and Figure 2 , the side of the movable table 11 close to the workbench 13 is fixed with four push blocks 6, and the two push blocks 6 are a group, and the two groups of push blocks 6 are respectively located on the two sides of the movable table 11. A second stretching block 3 is located between the two limiting blocks 4 and the two push blocks 6 on the same side. The two second stretching blocks 3 are respectively provided with first inclined surfaces 31 on the ends close to each other, and the inclined 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 in contact with the two side ends of the first inclined surface 31 on the same side, and the push block 6 drives the second stretching block 3 to move below the limiting block 4 by pressing the first inclined surface 31.

[0043] With reference to Figures 1-4The workbench 13 is further provided with four sets of limiting mechanisms 5 for limiting the sliding of the limiting blocks 4. The limiting mechanism 5 comprises a mounting groove 51 formed in the stand 18, a limiting rod 52 slidingly connected in the mounting groove 51 in the horizontal direction, a limiting hole 53 formed in the limiting block 4, and the limiting rod 52 inserted into the limiting hole 53. Initially, the limiting block 4 is located at the lowest position of the sliding track, and at this time, the mounting groove 51 is directly opposite to the limiting hole 53.

[0044] With reference to Figures 1-4 , the limiting mechanism 5 further comprises a driving assembly 54 for controlling the sliding of the limiting rod 52. The driving assembly 54 comprises a third spring 55 placed in the mounting groove 51, a pull rope 56 connected with the limiting rod 52, and a first rotating rod 57 rotatably connected with the workbench 13. The third spring 55 is located at the side of the limiting rod 52 away from the limiting block 4, and 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 mounting groove 51. Initially, the third spring 55 presses the limiting rod 52 against the limiting hole 53. The end of the pull rope 56 away from the limiting rod 52 penetrates through the third spring 55 and extends out of the stand 18, and the end of the pull rope 56 extending out of the stand 18 is fixed with the first rotating rod 57.

[0045] With reference to Figures 1-4 , the driving assembly 54 further comprises a first driving part 58 for driving the first rotating rod 57 to rotate. The first driving part 58 comprises a first one-way bearing 581 mounted on the first rotating rod 57, and a non-slip rubber ring is sleeved on the outer ring of the first one-way bearing 581. The outer ring of the first one-way bearing 581 is reversed to drive the inner ring of the first one-way bearing 581 and the first rotating rod 57 to rotate. During the process that the push block 6 descends along the first stretching block 2, the outer ring of the first one-way bearing 581 is contacted and driven to rotate in the positive direction. During the process that the push block 6 ascends along the first stretching block 2, the outer ring of the first one-way bearing 581 is contacted and driven to rotate in the positive direction.

[0046] With reference to Figure 1 , Figure 5 and Figure 6 , the first stretching block 2 is slidingly connected with a top plate 71 in the vertical direction, and a plurality of thimbles 72 are arranged on the top plate 71. In the initial state, the ends of the plurality of thimbles 72 away from the top plate 71 are flush with the top surface of the first stretching block 2. The second stretching block 3 is provided with a driving mechanism 8 for driving the top plate 71 to reciprocate up and down.

[0047] With reference to Figure 1 , Figure 5 and Figure 6 , the driving mechanism 8 comprises a second rotating rod 81 rotatably connected with the second stretching block 3, a connecting disc 82 coaxially fixedly connected with the second rotating rod 81, and a crank 83 having two ends hingedly connected with the connecting disc 82 and the top plate 71.

[0048] With reference to Figure 1 , Figure 5 and Figure 6 , the driving mechanism 8 further comprises a second driving part 84 for driving the second rotating rod 81 to rotate. The second driving part 84 comprises a second one-way bearing 841 sleeved on the second rotating rod 81, and a non-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 that of the connecting disc 82, and the outer ring of the second one-way bearing 841 abuts against the bottom wall of the sliding groove 15; the outer ring of the second one-way bearing 841 drives the inner ring of the second one-way bearing 841 to rotate when it is reversed; the outer ring of the second one-way bearing 841 is turned forward when the first stretching block 2 moves away from the mold fixing base 14; and the outer ring of the second one-way bearing 841 is reversed when the first stretching block 2 moves close to the mold fixing base 14.

[0049] The stretching and stamping steps of the hydraulic machine of the present application are as follows:

[0050] With reference to Figure 2 , when the hydraulic machine is used, the upper die of the stamping die is first installed at the bottom of the movable table 11, and the lower die of the stamping die is installed on the mold fixing base 14. Then, the two ends of the metal material are placed in the two placing cavities 17, and the stamping part of the metal material is located between the upper and lower dies of the stamping die.

[0051] With reference to Figure 2 and Figure 7 , then the oil cylinder 12 is started to make the piston rod of the oil cylinder 12 elongate to drive the movable table 11 to descend, and when the movable table 11 descends, the four push blocks 6 will push the two second stretching blocks 3 to move towards the first stretching block 2 and make the four second springs 22 be forced to compress, because of the existence of the four limiting blocks 4, the four push blocks 6 will not push the two first stretching blocks 2 to move at first when the four push blocks 6 push the two second stretching blocks 3 to move.

[0052] With reference to Figure 7 and Figure 8 , when the two second stretching blocks 3 move to abut against the metal material, the two second stretching blocks 3 move to the top surface thereof being flush with the bottom surface of the four limiting 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 to stretch the metal material, and when the two second stretching blocks 3 move away from each other, they will move below the two limiting blocks 4 and abut against the four limiting blocks 4, and the stability of the abutment of the two second stretching blocks 3 against the metal material is ensured by the four limiting blocks 4.

[0053] With reference to Figure 7 and Figure 8, the two first stretching blocks 2 will move away from each other, and the plurality of first springs 16 in the two sliding grooves 15 will be compressed under force. When the two push blocks 6 move away from the two first inclined surfaces 31, the two first stretching blocks 2 will no longer move, and the two push blocks 6 will move to the side close to the two first stretching blocks 2.

[0054] Referring to Figure 9 , the four push blocks 6 and the upper die of the stamping die will continue to move downward under the action of the workbench 13. In the process of the downward movement 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 in the positive direction. 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 displacement of the metal material.

[0055] Referring to Figure 2 , Figure 3 , Figure 4 and Figure 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. In the process of the upward movement of the four push blocks 6 close to the two first stretching blocks 2, the four push blocks 6 will drive 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.

[0056] Referring to Figure 2 , Figure 3 , Figure 4 and Figure 10 , when the four first rotating rods 57 reverse, the four pull ropes 56 will be wound, thereby driving the four limiting rods 52 to move into the four mounting grooves 51 and compressing the four third springs 55 under force. After the four limiting rods 52 move into the four mounting grooves 51, the four second springs 22 will rebound to 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 against the metal material. When the four push blocks 6 move away from the four first one-way bearings 581, the four third springs 55 rebound to drive the two limiting rods 52 to move out of the mounting grooves 51 and press the four limiting rods 52 against the four limiting blocks 4, and the four first rotating rods 57 are reversed.

[0057] Referring to Figure 10 , Figure 11 , subsequently, the four push blocks 6 continue to move upward, and when the four push blocks 6 move upward to the first inclined surface 31, the plurality of first springs 16 will rebound to drive the two first stretching blocks 2 to move close to each other. When the two first stretching blocks 2 move close to each other, the two second stretching blocks 3 will move close to each other, so that the two first inclined surfaces 31 always abut against the adjacent push blocks 6.

[0058] Referring to Figure 2 and Figure 3 When the two second stretching blocks 3 move to be not under the four limiting blocks 4, the four limiting blocks 4 will be reset by the gravity to make the four mounting slots 51 align with the four limiting holes 53, and the four limiting rods 52 will be pushed into the four limiting holes 53 by the rebound of the four third springs 55, so that the four limiting rods 52 restrict the sliding of the four limiting blocks 4 again. Subsequently, with the upward movement of the two push blocks 6, the second springs 22 will also push the two second stretching blocks 3 to move upward by a distance, and finally the two push blocks 6 and the two second stretching blocks 3 are reset.

[0059] Referring to Figure 5 , Figure 6 and Figure 11 During the mutual movement of the two first stretching blocks 2 to move close to the reset process, the outer rings of the two second one-way bearings 841 will be reversed to drive the inner rings of the two second one-way bearings 841 and the two second rotating rods 81 to rotate one circle. The rotation of the two second rotating rods 81 drives the two connecting discs 82 to rotate one circle, and the rotation of the two connecting discs 82 will drive the two top plates 71 to slide up and down through the two cranks 83. The up and down sliding of the two top plates 71 makes the multiple top pins 72 push the metal material upward, thereby completing the demolding of the metal material and the lower mold of the stamping die, and the disengagement of the metal material and the two first stretching blocks 2, facilitating the staff to take the stretched and stamped metal material.

[0060] After all the components are reset, the staff can take away the stretched and stamped metal material, and put new metal material into the two placing cavities 17 to restart the hydraulic machine to stretch and stamp the new metal material.

[0061] Of course, the above is only a typical example of the present application, in addition to which, the present application can have other various specific embodiments, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of the present application.

Claims

1. A hydraulic machine for metal material stretching, comprising a machine body (1), a movable table (11) connected to the machine body (1) in a vertical direction, an oil 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 die fixing base (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 located on the two sides of the mold fixing seat (14); the first stretching block (2) is connected in the sliding groove (15) and slides in the horizontal direction, the first spring (16) is arranged in the sliding groove (15), 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 towards the mold fixing seat (14); the second stretching block (3) is connected in the vertical direction on the first stretching block (2), and the placing cavity (17) for placing the metal material is formed between the first stretching block (2) and the second stretching block (3); the second spring (22) is arranged on the first stretching block (2), the elastic force of the second spring (22) acts on the second stretching block (3), and the second spring (22) is used for driving the second stretching block (3) to move away from the first stretching block (2); two vertical columns (18) are arranged on the workbench (13), two vertical columns (18) are connected in the vertical direction and slide and are provided with two limiting blocks (4), and the two limiting blocks (4) are located on the two sides of the two second stretching blocks (3) and abut against the two second stretching blocks (3) respectively; the workbench (13) is further provided with two sets of limiting mechanisms (5) for limiting the sliding of the limiting blocks (4); the movable table (11) is provided with two push blocks (6), the two second stretching blocks (3) are provided with first inclined surfaces (31) at one end close to each other, the two push blocks (6) abut against the two first inclined surfaces (31) respectively, and the push block (6) moves to the lower side of the limiting block (4) by pressing the first inclined surface (31).

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

3. The hydraulic machine for drawing a metal material according to claim 2, characterized in that: The driving assembly (54) comprises a third spring (55) arranged in the mounting groove (51), a pull rope (56) connected with the limiting rod (52), a first rotating rod (57) rotatably connected with 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 for driving the limiting rod (52) to move away from the mounting groove (51); the pull rope (56) extends out of the vertical column (18) and is connected with the first rotating rod (57).

4. The hydraulic machine for drawing a metal material 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 outer ring of the first one-way bearing (581) is reversed to 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) during the process of descending along the first stretching block (2) and drives the outer ring of the first one-way bearing (581) to rotate in the positive direction; the push block (6) contacts the outer ring of the first one-way bearing (581) during the process of ascending along the first stretching block (2) and drives the outer ring of the first one-way bearing (581) to rotate in the positive direction.

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

6. The hydraulic machine for drawing a metal material according to claim 5, wherein: The driving mechanism (8) comprises a second rotating rod (81) rotatably connected to the second stretching block (3), a connecting disc (82) arranged on the second rotating rod (81), a crank (83) hingedly connected to the connecting disc (82) and the top plate (71) at both ends, and a second driving part (84) for driving the second rotating rod (81) to rotate.

7. The hydraulic machine 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 greater than the diameter of the connecting disc (82), and the outer ring of the second one-way bearing (841) abuts against the bottom wall of the sliding groove (15); the outer ring of the second one-way bearing (841) is reversed to drive the inner ring of the second one-way bearing (841) to rotate; the outer ring of the second one-way bearing (841) rotates in the positive direction when the first stretching block (2) moves away from the mold fixed base (14); the outer ring of the second one-way bearing (841) is reversed when the first stretching block (2) moves close to the mold fixed base (14).

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