Automatic die changing system for a press

Abstract

The application discloses a press automatic die changing system and relates to the technical field of press automatic die changing, which comprises a hydraulic press, a conveying assembly, a power unit and a positioning assembly arranged on a rack. One end of the conveying assembly is connected with the lower part of the hydraulic press, and the die can be conveyed to the base by the conveying assembly. The power unit is used for driving the die to displace along the conveying assembly. The positioning assembly has a first stroke and a second stroke. In the first stroke, the positioning assembly guides and locks the die in the horizontal direction during the falling of the die. After the power unit is started, the positioning assembly passively performs the second stroke. The application automatically guides and locks the die in the horizontal direction during the falling of the die, ensures the accuracy of the falling position, and ensures the stability of the die on the roller frame by locking the position. In the process of pushing the die by the driving assembly, the locking part is automatically unlocked, and the positioning assembly is separated from the die. In this way, the die moves more smoothly during the pushing.

Description

Technical Field

[0001] This invention relates to the field of automatic mold changing technology for presses, specifically to an automatic mold changing system for presses. Background Technology

[0002] Molds are a common production equipment in the industrial field. They are tools used to make shaped items. Molds are opened and closed by hydraulic press control. When changing molds, some large stamping molds are often changed through a mold changing system.

[0003] In existing mold-changing systems, the overhead crane places the mold on a roller frame, and a mold lifter with rollers is installed on the press base. External force pushes the mold along the roller frame to the lifter. Once the mold is in place, the lifter lowers, and the mold is placed on the press base. A locking structure then locks the mold in place, completing the installation. To ensure mold stability during movement, the roller frame uses a roller structure instead of a ball bearing structure, ensuring the mold can only move in a set direction. Therefore, the mold's placement along its length is crucial; significant positional differences increase installation difficulty. Current technology typically involves workers observing and directing the overhead crane for fine-tuning to ensure accurate placement. This requires close observation and is unsafe. Alternatively, positioning plates on both sides of the roller frame guide the mold's placement, but this method inevitably results in the mold contacting the positioning plates during lateral movement, making the movement less smooth. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic mold changing system for presses, so as to overcome the shortcomings of the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic mold changing system for a press, comprising a hydraulic press, and further comprising a conveying assembly, a power unit, and a positioning assembly mounted on a frame.

[0006] One end of the conveying assembly is connected to the lower part of the hydraulic press, and the mold can be conveyed to the base by the conveying assembly;

[0007] The power unit is used to drive the mold to move along the conveyor assembly;

[0008] The positioning component has a first stroke and a second stroke. In the first stroke, the positioning component guides and locks the mold in the horizontal direction during the mold's descent. After the power unit is started, the positioning component passively performs the second stroke to separate the positioning component from the mold. After the mold is fed into the hydraulic press, the positioning component resets to its initial state.

[0009] Preferably, the conveying assembly includes a pair of symmetrically arranged roller frames, and the roller frames are provided with a plurality of rollers of equal height.

[0010] Preferably, the power unit includes a conveyor belt, a pusher block, a track, and auxiliary wheels. The pusher block is fixedly installed on the conveyor belt, the upper part of the conveyor belt is slidably connected to the track, the auxiliary wheels are rotatably connected to both sides of the pusher block, and the auxiliary wheels are tumbledly connected to the track.

[0011] Preferably, it also includes a servo motor, which is used to drive the conveyor belt to rotate.

[0012] Preferably, the positioning component includes a base, a column, a first elastic element, a slider, a guide seat, a mold-locking part, and a linkage part. The base is fixedly installed on the frame, and grooves adapted to the slider are opened at both ends of the base. The column is installed in the groove and passes through the slider. The guide seat is rotatably connected in the slider. The first elastic element applies an upward thrust to the slider. The mold-locking part is located at the lower part of the guide seat. During the falling process of the guide seat, the linkage part drives the mold-locking part to move along the length direction of the guide seat.

[0013] Preferably, the linkage includes a lead screw, a first gear, a rack, a shaft, a second elastic element, and a second gear. The lead screw is rotatably connected to a guide seat, the first gear is fixedly mounted on the lead screw, the second gear is rotatably connected to the guide seat, and the second gear meshes with the first gear. The rack is slidably connected to a base, one end of the shaft is inserted into the rack, and the other end is fixedly mounted on the frame. The second elastic element is sleeved on the shaft, and the second elastic element applies an upward thrust to the rack.

[0014] Preferably, the locking part includes a displacement block, a third elastic element, and a locking post. The displacement block is threaded to the outside of the lead screw, the locking post is slidably connected inside the displacement block, and the third elastic element applies an upward thrust to the locking post.

[0015] Preferably, it also includes a pressure rod, which is fixedly mounted on the power unit. During the second stroke, the pressure rod presses against the guide seat, causing the guide seat to move downward.

[0016] Preferably, it also includes a mold lifter, and the lower part of the press is provided with a strip groove to accommodate the mold lifter.

[0017] Preferably, it also includes limit pins, which are set at both ends of the conveying component, and the height of the limit pins is adjusted by a cylinder.

[0018] In the above technical solution, the automatic mold changing system for a press provided by the present invention automatically guides the mold and locks its horizontal movement during the descent by setting the positioning component, ensuring the accuracy of the descent position and ensuring the stability of the mold on the roller frame by locking the position. Then, during the stroke of the drive component pushing the mold, the locking part automatically unlocks and the positioning component disengages from the mold, so that the mold moves more smoothly when pushed. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of a hydraulic press for an automatic mold changing system of a press according to the present invention;

[0021] Figure 2 This is an overall schematic diagram of the automatic mold changing system for a press according to the present invention when the mold is not in place;

[0022] Figure 3 This invention provides an automatic mold changing system for a press. Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is a schematic diagram of the overall structure of the automatic mold changing system for a press during the second stroke of the present invention;

[0024] Figure 5 This invention provides an automatic mold changing system for a press. Figure 4 Enlarged view of point B in the middle;

[0025] Figure 6 This is a schematic diagram of the positioning component during the first stroke of an automatic mold changing system for a press according to the present invention;

[0026] Figure 7 This is a schematic diagram of the positioning component during the first stroke of an automatic mold changing system for a press according to the present invention;

[0027] Figure 8 This is a schematic diagram of the positioning component during the second stroke of an automatic mold changing system for a press according to the present invention;

[0028] Figure 9 This is a schematic diagram of the mold locking section structure of an automatic mold changing system for a press during the first stroke of the present invention;

[0029] Figure 10 This invention provides an automatic mold changing system for a press. Figure 9 Enlarged view of point C;

[0030] Figure 11 This is a schematic diagram of the first stroke of the automatic mold changing system for a press according to the present invention, after the mold locking part locks the mold.

[0031] Figure 12 This invention provides an automatic mold changing system for a press. Figure 11 Enlarged view of point D;

[0032] Figure 13 This is a schematic diagram of the mold locking section of an automatic mold changing system for a press according to the present invention;

[0033] Figure 14 This is a schematic diagram of the pressure rod of an automatic mold changing system for a press according to the present invention.

[0034] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Conveying assembly; 3. Power unit; 4. Positioning assembly; 5. Mold; 6. Hydraulic press; 31. Conveyor belt; 32. Pushing block; 33. Pressure rod; 311. Track; 321. Auxiliary wheel; 41. Base; 42. Slider; 43. Guide seat; 44. Mold locking part; 45. Linkage part; 411. Column; 412. First elastic element; 441. Displacement block; 442. Locking pin; 443. Third elastic element; 451. Lead screw; 452. First gear; 453. Rack; 454. Shaft; 455. Second elastic element; 456. Second gear. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Please see Figure 1-14 The present invention provides an automatic mold changing system for a press, including a hydraulic press 6, and further including a conveying assembly 2, a power unit 3, and a positioning assembly 4 mounted on a frame 1.

[0037] One end of the conveying component 2 is connected to the lower part of the hydraulic press 6, and the mold 5 can be conveyed to the hydraulic press 6 by the conveying component 2;

[0038] The power unit 3 is used to drive the mold to move along the conveying assembly 2;

[0039] The positioning component 4 has a first stroke and a second stroke. In the first stroke, the positioning component 4 guides and locks the mold 5 in the horizontal direction during the falling process. After the power unit 3 is started, the positioning component 4 passively performs the second stroke to separate the positioning component 4 and the mold 5. After the mold 5 is fed into the hydraulic press 6, the positioning component 4 is reset to the initial state.

[0040] In this embodiment of the invention, initially, one end of the conveying assembly 2 is connected to the hydraulic press 6. The mold 5 is slowly lowered onto the conveying assembly 2 by a trolley. As the mold 5 falls from top to bottom, the positioning assembly 4 is initially in an unfolded state, forming an inverted "V" shape to guide the mold 5. As the falling continues, the mold 5 is guided to the center position by the positioning assembly 4, and the positioning assembly 4 forms a locking mechanism that fits into the lower side of the mold 5, achieving centering guidance. After centering guidance is completed, the mold 5 continues to fall, thus driving the positioning assembly 4 to continue the latter part of the first stroke. During this process, the positioning assembly 4 will guide the mold... 5. The horizontal direction is limited, so that the height can only change in the vertical direction. As it falls, the mold 5 will fall back onto the conveying component 2. Then, the power unit 3 is started. The power unit 3 pushes the mold 5 through its own structure, so that it moves along the conveying component 2 towards the hydraulic press 6. At the same time, the start of the power unit 3 will trigger the positioning component 4 to passively perform the second stroke, which can separate the positioning component 4 from the mold 5, so as to avoid the positioning component 4 from obstructing the movement of the mold 5 and ensure that the mold 5 moves smoothly along the conveying component 2. After the mold 5 is separated from the positioning component 4, it is reset to the initial state by the elasticity of the positioning component 4, waiting for the next mold changing cycle.

[0041] By automatically guiding and locking the horizontal movement when the mold falls, the mold can be accurately positioned without human intervention, avoiding the risk of close-range operation by personnel. After positioning is completed, the positioning component 4 moves the mold 5. The positioning component 4 passively disengages from the mold 5, so the mold 5 will not rub against the positioning structure during the lateral movement. Positioning is completed in the first stroke and the positioning constraint is released in the second stroke, allowing the mold 5 to move unimpeded along the conveying component 2.

[0042] In another embodiment of the present invention, the conveying assembly 2 includes a pair of symmetrically arranged roller frames, and a plurality of rollers of equal height are provided on the roller frames. The roller frames can support the weight of the mold 5, and at the end of the first stroke, the weight of the mold 5 is supported by the roller frames.

[0043] In another embodiment of the present invention, the power unit 3 includes a conveyor belt 31, a pusher block 32, a track 311, and auxiliary wheels 321. The pusher block 32 is fixedly mounted on the conveyor belt 31. The upper part of the conveyor belt 31 is slidably connected to the track 311. The auxiliary wheels 321 are rotatably connected to both sides of the pusher block 32, and the auxiliary wheels 321 are rollingly connected to the track 311. A servo motor is also included to drive the conveyor belt 31 to rotate.

[0044] After mold 5 is positioned, the servo motor starts to drive the conveyor belt 31 to rotate. Since the upper part of the conveyor belt 31 is slidably connected to the track 311, the track 311 directly constrains the movement direction of the conveyor belt, providing stable support for the pusher block 32 along the conveying direction of mold 5. The pusher block 32 is fixedly installed on the conveyor belt 31 and moves synchronously with the conveyor belt 31 along the track 311, becoming a force-applying component directly in contact with mold 5. Simultaneously, the auxiliary wheels 321 on both sides of the pusher block 32 are rotatably connected to the track 311, thus pushing... The sliding friction between the push block 32 and the track 311 is converted into rolling friction to significantly reduce motion resistance. Lateral constraints prevent the push block 32 from shaking due to uneven force when pushing the heavy mold 5. When the push block moves with the conveyor belt 32 to the side of the mold 5, it will apply a horizontal thrust to the mold 5. Combined with the low friction characteristics of the equal-height rollers on the conveyor assembly 2, the mold 5 is finally driven to move smoothly towards the hydraulic press 6 along the direction. In the end, it can achieve stable and precise driving of large molds weighing several tons, solving the pain points of uneven force application and high frictional resistance in traditional manual methods.

[0045] In an embodiment of the present invention, the positioning component 4 includes a base 41, a column 411, a first elastic element 412, a slider 42, a guide seat 43, a mold-locking part 44, and a linkage part 45. The base 41 is fixedly installed on the frame 1. Grooves adapted to the slider 42 are formed at both ends of the base 41. The column 411 is installed in the groove and passes through the slider 42. The guide seat 43 is rotatably connected to the slider 42. The first elastic element 412 applies an upward thrust to the slider 42. The mold-locking part 44 is disposed at the lower part of the guide seat 43. During the falling process of the guide seat 43, the linkage part 45 drives the mold-locking part 44 to move along the length direction of the guide seat 43.

[0046] Initially, the first elastic element 412 applies an upward thrust to the slider 42, causing the slider 42 to be in a higher position along the column 411. The guide seat 43 is rotatably connected to the slider 42 and is in a higher position along with the slider 42. Because the upper part of the base 41 has a rounded chamfer, and lacking the side support of the base 41, the guide seat 43 can tilt to both sides. When the mold 5 falls, the guide seat 43 at this time... Figure 3As shown, the mold 5 is in an unfolded state. In this state, the guide seat 43 provides guidance, driving the mold 5 towards the center during its descent. This, combined with adjustments to the gantry crane, assists the mold 5 in positioning itself at a specific location. During this process, the weight of the mold 5 first contacts and presses against the guide seat 43. The guide seat then drives the slider 42 to overcome the elastic force of the first elastic element 412 and move downwards along the column 411. As the guide seat 43 descends, it flips, guiding the mold 5 to the center position. The guide seat 43 also flips to allow its sides to rotate. The guide seat 43 is moved to a position parallel to the base 41 to ensure its smooth downward movement. Then, the guide seat 43 continues to move downward, and the linkage 45 is triggered, converting the vertical downward movement of the guide seat 43 into driving force, which drives the locking part 44 to move along the length direction of the guide seat 43. During this process, the locking part 44 will move along the bottom surface of the mold 5 until the locking part 44 moves to the reserved hole on the bottom surface of the mold 5. The locking part 44 automatically inserts into the reserved hole to limit the horizontal displacement of the mold 5 until the bottom surface of the mold 5 contacts the conveying component 2, and the conveying component 2 supports the mold 5.

[0047] Immediately after starting the power unit 3, as the push block 32 moves, the pressure rod 33 will squeeze the guide seat 43. The guide seat 43 continues to move downward and further compresses the first elastic element 412. The mold locking part 44 and the guide seat 43 separate from the mold 5, thus completely separating the positioning component 4 from the mold 5 and eliminating the obstruction during mold displacement. After the mold 5 is sent into the hydraulic press 6, the pressure of the mold on the guide seat 43 disappears, the first elastic element 412 recovers its deformation, pushes the slider 42 upward and resets along the column 411, and drives the guide seat 43 back to the initial high position. The linkage part 45 and the mold locking part 44 also reset to the standby state simultaneously, preparing for the next mold change.

[0048] By automatically guiding mold 5 and automatically locking and separating it after guidance, no manual intervention is required, eliminating the safety hazards of manual fine-tuning and avoiding the problem of precise positioning structures hindering mold movement.

[0049] In another embodiment of the present invention, the linkage 45 includes a lead screw 451, a first gear 452, a rack 453, a shaft 454, a second elastic element 455, and a second gear 456. The lead screw 451 is rotatably connected to the guide seat 43. The first gear 452 is fixedly mounted on the lead screw 451. The second gear 456 is rotatably connected to the guide seat 43 and meshes with the first gear 452. The rack 453 is slidably connected to the base 41. One end of the shaft 454 is inserted into the rack 453, and the other end is fixedly mounted on the frame 1. The second elastic element 455 is sleeved on the shaft 454, and the second elastic element 455 applies an upward thrust to the rack 453.

[0050] Because the mold 5 has slight differences in its placement position in the front and back directions, the reserved hole of the mold 5 and the locking part 44 cannot be aligned. Therefore, the locking part 44 will move in the next process of the mold 5 until the locking part 44 automatically aligns with the reserved hole and locks. Because the mold 5 is placed in different front and back positions, the distance that the locking part 44 moves each time is also different.

[0051] In this embodiment, the core design of the linkage part 45 is to solve the problem of misalignment between the locking part 44 and the reserved hole caused by slight differences in the front and rear positions of the mold 5. This allows the locking part to automatically adjust its movement distance as needed and accurately align with the hole. Initially, the rack 453 is slidably connected to the base 41 via the shaft 454. One end of the shaft 454 is fixed to the frame 1, restricting the rack 453 to slide only vertically. The second elastic element 455 is sleeved on the shaft 454 and applies an upward thrust to the rack 453, keeping the rack 453 and the second gear 456 meshed. The lead screw 451 is rotatably connected to the guide seat 43. The first gear 452 is fixed to the lead screw 451 and meshes with the second gear 456. When the guide seat 43 moves downward, the rack 453 drives the second gear 456 to rotate, and the second gear 456 drives the first gear 452. The first gear 452 rotates synchronously, driving the lead screw 451 to rotate. The rotation of the first lead screw 451 causes the locking part 44 to move along its axial direction. In this way, the locking part 44 automatically aligns with the reserved hole at the bottom of the mold 5. After the locking part 44 is aligned, the guide seat 43 continues to move down with the mold 5. However, the locking part 44 cannot continue to move along the lead screw 451. The second gear 456 moves down with the guide seat 43. At this time, the second gear 456 cannot continue to rotate. This applies downward pressure to the rack 453, so that it can overcome the elastic force of the second elastic element 455 and move down. This achieves dynamic compensation for the locking part 44. Even when there is a deviation in the front and rear position of the mold 5, it still ensures that the locking part 44 can move to the reserved hole of the mold 5. The entire process achieves adaptive and precise alignment without manual intervention.

[0052] In an embodiment of the present invention, the locking part 44 includes a displacement block 441, a third elastic element 443, and a locking post 442. The displacement block 441 is threaded to the outside of the lead screw 451, the locking post 442 is slidably connected to the inside of the displacement block 441, and the third elastic element 443 applies an upward thrust to the locking post 442.

[0053] During the alignment process, the locking part 44 is located at the lower part of the guide seat 43. Therefore, the locking pin 442 will abut against the bottom surface of the mold 5. The third elastic member 443 is compressed to ensure that the locking pin 442 is retracted into the displacement block 441 and the displacement block 441 is flush with the lower part of the guide seat 43. Therefore, the locking pin 442 will not affect the mold 5. As the mold 5 and the guide seat 43 fall, the locking part 44 will move laterally until the locking pin 442 is aligned with the reserved hole of the mold 5. Under the elastic force of the third elastic member 443, the locking pin 442 extends out and inserts into the reserved hole to lock the mold 5.

[0054] In another embodiment of the present invention, a pressure rod 33 is further included, which is fixedly mounted on the power unit 3. During the second stroke, the pressure rod 33 presses the guide seat 43 so that the guide seat 43 is displaced downward.

[0055] The pressure rod 33 is fixedly installed on the power unit 3. When the power unit 3 is started, the pressure rod 33 will move synchronously towards the guide seat 43. The side of the pressure rod 33 near the guide seat 43 is provided with a rounded chamfer to achieve a better connection. When the pressure rod 33 moves to the position of contacting the guide seat 43, it will apply a downward squeezing force to the guide seat, forcing the guide seat 43 to overcome the elastic force of the first elastic element 412 and continue to move downward. This displacement is different from the downward movement pressed by the weight of the mold 5 in the first stroke. This is an active additional downward movement in the second stroke. As the guide seat 43 moves further downward, the mold locking part 44 moves downward synchronously and disengages from the reserved hole of the mold 5. This ensures that the mold can move smoothly along the conveying assembly 2 to the hydraulic press 6 under the drive of the power unit 3, avoiding the positioning structure from hindering the movement of the mold. The guide seat 43 is set in an L shape, and its vertical side gradually narrows from bottom to top. In this way, after the guide seat 43 moves downward independently, it can ensure that its vertical side separates from the mold 5, ensuring the smooth movement of the mold 5.

[0056] It also includes a mold lifter, and the lower part of the hydraulic press 6 is provided with a strip groove to accommodate the mold lifter. After stamping, the mold lifter is raised to the same height as the roller frame to smoothly receive the mold from the roller frame. After reaching the predetermined position, the mold lifter is depressurized, and the mold 5 falls onto the hydraulic press 6.

[0057] It also includes limit pins, which are located at both ends of the conveying assembly 2. The height of the limit pins is adjusted by a cylinder. The limit pins distributed on both sides of the conveying assembly 2 can limit the mold 5 to prevent the mold 5 from slipping and ensure safety during mold changing.

[0058] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An automatic mold changing system for a press, comprising a hydraulic press (6), characterized in that, It also includes a conveying assembly (2), a power unit (3), and a positioning assembly (4) mounted on the frame (1): One end of the conveying component (2) is connected to the lower part of the hydraulic press (6), and the mold (5) can be conveyed to the hydraulic press (6) by the conveying component (2). The power unit (3) is used to drive the mold to move along the conveying assembly (2); The positioning component (4) has a first stroke and a second stroke. In the first stroke, the positioning component (4) guides and locks the mold (5) during its descent and moves it horizontally. After the power unit (3) is started, the positioning component (4) passively performs the second stroke to separate the positioning component (4) and the mold (5). After the mold (5) is fed into the hydraulic press (6), the positioning component (4) is reset to its initial state. The positioning component (4) includes a base (41), a column (411), a first elastic element (412), a slider (42), a guide seat (43), a mold locking part (44), and a linkage part (45). The base (41) is fixedly installed on the frame (1). The two ends of the base (41) are provided with grooves that are adapted to the slider (42). The column (411) is installed in the groove and passes through the slider (42). The guide seat (43) is rotatably connected to the slider (42). The first elastic element (412) applies an upward thrust to the slider (42). The mold locking part (44) is located at the lower part of the guide seat (43). During the falling process of the guide seat (43), the linkage part (45) drives the mold locking part (44) to move along the length direction of the guide seat (43).

2. The automatic mold changing system for a press according to claim 1, characterized in that, The conveying assembly (2) includes a pair of symmetrically arranged roller frames, and several rollers of equal height are provided on the roller frames.

3. The automatic mold changing system for a press according to claim 1, characterized in that, The power unit (3) includes a conveyor belt (31), a pusher block (32), a track (311), and an auxiliary wheel (321). The pusher block (32) is fixedly installed on the conveyor belt (31). The upper part of the conveyor belt (31) and the track (311) are slidably connected. The auxiliary wheel (321) is rotatably connected to both sides of the pusher block (32). The auxiliary wheel (321) and the track (311) are tumbled together.

4. The automatic mold changing system for a press according to claim 3, characterized in that, It also includes a servo motor, which is used to drive the conveyor belt (31) to rotate.

5. The automatic mold changing system for a press according to claim 1, characterized in that, The linkage (45) includes a lead screw (451), a first gear (452), a rack (453), a shaft (454), a second elastic element (455), and a second gear (456). The lead screw (451) is rotatably connected to the guide seat (43). The first gear (452) is fixedly installed on the lead screw (451). The second gear (456) is rotatably connected to the guide seat (43). The second gear (456) and the first gear (452) mesh. The rack (453) is slidably connected to the base (41). One end of the shaft (454) is inserted into the rack (453), and the other end is fixedly installed on the frame (1). The second elastic element (455) is sleeved on the shaft (454), and the second elastic element (455) applies an upward thrust to the rack (453).

6. The automatic mold changing system for a press according to claim 5, characterized in that, The locking part (44) includes a displacement block (441), a third elastic element (443), and a locking post (442). The displacement block (441) is threaded to the outside of the lead screw (451), and the locking post (442) is slidably connected inside the displacement block (441). The third elastic element (443) applies an upward thrust to the locking post (442).

7. The automatic mold changing system for a press according to claim 6, characterized in that, It also includes a pressure rod (33), which is fixedly mounted on the power unit (3). During the second stroke, the pressure rod (33) presses against the guide seat (43) so that the guide seat (43) is displaced downward.

8. The automatic mold changing system for a press according to claim 1, characterized in that, It also includes a mold lifter, and the lower part of the hydraulic press (6) is provided with a strip groove to accommodate the mold lifter.

9. The automatic mold changing system for a press according to claim 1, characterized in that, It also includes limit pins, which are set at both ends of the conveying assembly (2), and the height of the limit pins is adjusted by a cylinder.

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