A hydraulic press with automatic loading and unloading

Abstract

The present invention complies with the technical field of hydraulic presses, and in particular relates to an automatic loading and unloading hydraulic press. It comprises: a base, the base is fixedly connected to a main hydraulic cylinder, the base is slidably connected to a first slide plate and a second slide plate, the second slide plate is provided with a through hole; a first hydraulic rod, two of which are provided, respectively fixed to the main hydraulic cylinder; a support plate, fixedly connected to the second slide plate, the support plate is slidably connected to a feed box, a lower mold, provided in the through hole of the second slide plate, the second slide plate is fixedly connected to a cover plate, the first slide plate is fixedly connected to an upper mold; a fixed seat, fixedly connected to the base, the fixed seat is rotatably connected to a support rod. The present invention enables the upper part of the support rod to drive the lower mold to rotate, so that the metal powder falling into the lower mold is subjected to the centrifugal force, and the metal powder is attached to the inner side of the lower mold under the action of the centrifugal force, so as to avoid the occurrence of holes in some positions of the mold due to excessive flow resistance of the metal powder.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic presses, and in particular to an automatic loading and unloading hydraulic press. Background Art

[0002] In the current process of using hydraulic presses to produce gears, materials can only fall freely into the mold. Due to the tight teeth of the gears, after the materials cover the upper side of the mold, the materials have great flow resistance, which can easily lead to uneven filling of materials at some teeth and produce holes. In addition, the mold is very heavy, and it is difficult to apply vibration force to the mold to vibrate the material, so that the material produces a small flow in the mold and fills some holes in the mold, which can easily lead to various defects in the gears with tight teeth. Summary of the invention

[0003] In order to overcome the above-mentioned shortcomings of the existing hydraulic press, the present invention provides an automatic loading and unloading hydraulic press.

[0004] The technical solution of the present invention is: an automatic loading and unloading hydraulic press, comprising: a base, the base is fixedly connected to a main hydraulic cylinder through four columns, the four columns of the base are slidably connected with a first slide and a second slide, the second slide is provided with a through hole, and the telescopic end of the main hydraulic cylinder is fixedly connected to the first slide; a first hydraulic rod is provided with two, which are respectively fixedly connected to the two sides of the main hydraulic cylinder, and the telescopic ends thereof are both fixedly connected to the second slide; a support plate is fixedly connected to one side of the second slide, a feeding box is slidably connected to the support plate, a lower mold is arranged in the through hole of the second slide, a cover plate is fixedly connected to the lower side of the second slide, the lower mold is rotatably connected to the second slide and the cover plate, and the first slide is fixedly connected to an upper mold; a fixed seat is fixedly connected to the base, the fixed seat is rotatably connected to a support rod, and the upper part of the support rod is located in the lower mold; a driving assembly is arranged on the base, and is used to drive the support rod and the lower mold to rotate.

[0005] It is further explained that the shape of the upper portion of the support rod is the same as the shape of the inner cavity of the lower mold, and the upper portion of the support rod is slidably connected to the lower mold.

[0006] It is further explained that the second slide plate is fixedly connected with two symmetrically distributed limit rails for guiding the feed box, and the feed box is installed with a buffer block for buffering the impact force between the feed box and the pressed embryo.

[0007] To further explain, the driving assembly includes: a one-way gear fixedly connected to the support rod, a torsion spring fixedly connected between the one-way gear and the fixed seat; a guide rail fixedly connected to the base, a sliding frame slidably connected in the guide rail, the sliding frame fixedly connected to a first rack, the first rack is transmission-connected to the one-way gear; a second hydraulic rod fixedly connected to the base, the telescopic end of the second hydraulic rod fixedly connected to the sliding frame.

[0008] Further description, it also includes: a dust cover, which is fixed to the upper side of the second slide plate, the dust cover is rotatably connected to the lower mold, and the dust cover is used to seal the gap between the second slide plate and the lower mold.

[0009] Further description, it also includes: a correction mechanism, which is arranged on the fixed seat and is used to correct the position of the support rod, and the correction mechanism includes: a fixed ring, which is fixedly connected to the upper side of the fixed seat through a mounting seat, the fixed ring is provided with a plurality of sliding grooves, and the plurality of sliding grooves of the fixed ring are slidably connected to limiting blocks, the outer wall of the support rod is provided with a plurality of limiting holes, the limiting block is fixedly connected with a sliding column, and the sliding column is slidably connected to the fixed ring; a gear ring, which is rotatably connected to the fixed ring, a torsion spring 2 is fixed between the gear ring and the fixed ring, the gear ring is provided with a plurality of inclined through grooves, and the sliding column is located in the inclined through grooves adjacent to the gear ring and slides; a second rack, which is fixedly connected to the sliding frame, the second rack and the gear ring are located at the same height, and the second rack is transmission-connected to the gear ring.

[0010] It is further explained that the first rack and the second rack have the same shape, are placed in opposite positions, and both teeth face the support rod.

[0011] It is further described that the limit block is provided with a plurality of inclined surfaces, and the width of one end of the limit block close to the support rod is smaller than the width of the other end.

[0012] It is further described that the height of the limiting hole of the support rod is greater than the height of the limiting block, and the shape of the limiting hole of the support rod is the same as that of the limiting block.

[0013] It is further explained that the limit block is set to be made of hard and wear-resistant metal material, and the central axes of the fixing ring and the gear ring coincide with the central axis of the support rod.

[0014] The beneficial effects of the present invention are as follows: 1. Under the elastic force of the torsion spring 1, the upper part of the support rod drives the lower mold to rotate, and the lower mold rotates instantly, so that the metal powder falling into the lower mold is subjected to the centrifugal force. The metal powder adheres to the inner side of the lower mold under the action of the centrifugal force, and the metal powder enters the tooth groove of the lower mold and fills it, thereby avoiding the occurrence of cavities in some positions of the mold due to excessive flow resistance of the metal powder, thereby improving the quality of the gear. At the same time, the present invention utilizes the forward and backward movement of the feeding box to transfer the metal powder therein to the lower mold, and at the same time, the front part of the feeding box pushes the pressed parts forward when moving, thereby completing the automatic loading and unloading of the hydraulic press and reducing the labor intensity of the staff; 2. The present invention uses three limit blocks to correct the position of the support rod to avoid the relative position deviation between the lower mold and the upper mold on the first slide, which will cause the teeth of the lower mold and the upper mold on the first slide to be misaligned, causing mold wear and resulting in deviation in gear accuracy, and even the lower mold collides with the upper mold on the first slide and is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a side view stereoscopic structural diagram of the second slide plate and the supporting plate and other parts of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the fixing seat and supporting rod and other parts of the present invention; Figure 4 is a schematic cross-sectional three-dimensional structural diagram of the second slide plate of the present invention; Figure 5 It is a three-dimensional structural schematic diagram of the one-way gear and torsion spring and other parts of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of the sliding frame and the first rack and other parts of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the fixing seat, the sliding column and the gear ring of the present invention; Figure 8 It is a cross-sectional three-dimensional structure explosion diagram of the fixing ring of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the fixing ring, the limiting block and the sliding column of the present invention.

[0016] The accompanying drawings are marked as: 1-base, 2-main hydraulic cylinder, 3-first slide, 4-second slide, 5-first hydraulic rod, 6-support plate, 7-feeding box, 8-lower mold, 9-cover plate, 10-fixed seat, 11-support rod, 12-dust cover, 13-one-way gear, 14-torsion spring 1, 15-guide rail, 16-sliding frame, 17-first rack, 18-second hydraulic rod, 19-fixing ring, 20-limiting block, 21-sliding column, 22-tooth ring, 23-second rack, 24-torsion spring 2. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Embodiment 1: An automatic loading and unloading hydraulic press, such as Figure 1-Figure 4As shown, it includes: a base 1, the base 1 is fixedly connected to a main hydraulic cylinder 2 through four columns, the main hydraulic cylinder 2 is a structure on an existing oil hydraulic press, and its internal structure is not fully shown in the attached figure, the four columns of the base 1 are slidably connected to a first slide plate 3 and a second slide plate 4, the second slide plate 4 is provided with a through hole, the first slide plate 3 is located above the second slide plate 4, the telescopic end of the main hydraulic cylinder 2 is fixedly connected to the first slide plate 3; a first hydraulic rod 5, a total of two are provided, which are respectively fixedly connected to both sides of the main hydraulic cylinder 2, the telescopic end of the first hydraulic rod 5 is fixedly connected to the second slide plate 4, the first hydraulic The rod 5 is used to drive the second slide plate 4 to slide along the four columns; the support plate 6 is fixedly connected to the rear side of the second slide plate 4, and a feeding box 7 is slidably connected to the support plate 6. The feeding box 7 is connected to the feeding box through a hose for continuous feeding. The lower side of the feeding box 7 slides in contact with the support plate 6 and the second slide plate 4, so that the metal powder in the feeding box 7 moves with it; the lower mold 8 is arranged in the through hole of the second slide plate 4, and a cover plate 9 is fixedly connected to the lower side of the second slide plate 4. The cover plate 9 is used to support the lower mold 8. The lower mold 8 is rotatably connected to the second slide plate 4 and the cover plate 9. The slide plate 3 is fixedly connected with an upper mold, and the upper mold on the first slide plate 3 is inserted into the lower mold 8 to complete the extrusion of the metal powder; the fixed seat 10 is fixedly connected to the base 1, and the fixed seat 10 is rotatably connected with a support rod 11, and the upper part of the support rod 11 is located in the lower mold 8; the driving component is arranged on the base 1, and is used to drive the support rod 11 and the lower mold 8 to rotate. When the metal powder enters the lower mold 8, the lower mold 8 is in a rotating state, and the upper part of the support rod 11 has the same shape as the inner cavity shape of the lower mold 8, and the upper part of the support rod 11 is slidably connected to the lower mold 8. A convex ring is provided in the middle of the lower mold 8, and rotating bearings are fixedly connected to the upper and lower sides of the convex ring in the middle of the lower mold 8, which are used to reduce the friction between the lower mold 8 and the second slide plate 4 and the cover plate 9. The second slide plate 4 is fixed with two symmetrically distributed limit rails, and the limit rails are installed on the second slide plate 4 by bolts, which are used to guide the feeding box 7. When the feeding box 7 moves, it will move in close contact with the two limit rails, and the feeding box 7 is installed with a buffer block. The buffer block on the feeding box 7 can be set to sponge or rubber, which is used to buffer the impact force between the feeding box 7 and the pressed embryo.

[0019] like Figure 3-Figure 6As shown, the driving assembly includes: a one-way gear 13, which is fixed to the support rod 11. The one-way gear 13 is an existing structure. The one-way gear 13 is divided into an inner ring and an outer ring. The outer ring of the one-way gear 13 drives its inner ring to rotate only when it rotates clockwise (in the top view direction). The inner ring of the one-way gear 13 is fixed to the support rod 11. A torsion spring 14 is fixed between the one-way gear 13 and the fixed seat 10. The torsion spring 14 is sleeved on the outside of the support rod 11; a guide rail 15, which is fixed to the base 1, and a sliding frame 16 is slidably connected in the guide rail 15. The sliding frame 16 is fixed with a first rack 17, and the first rack 17 is transmission-connected to the one-way gear 13; a second hydraulic rod 18, which is fixed to the base 1, and the telescopic end of the second hydraulic rod 18 is fixed to the sliding frame 16.

[0020] In the above scheme, the main purpose is to ensure that the metal powder fills each tooth groove of the lower mold 8 synchronously, so as to avoid uneven filling of the metal powder in each tooth groove of the lower mold 8 and cause various defects in the pressed gear. In the drawings of the present application, the hydraulic system and control system of the oil hydraulic press are not shown, and the feed box is not shown in the figure. In order to facilitate the removal of the pressed gear, an inclined sieve plate is installed on the front side of the second slide 4 to guide the pressed gear and screen and recover the overflowed metal powder. In the drawings, the electric push rod of the feed box 7 is not shown. The electric push rod is used to push the feed box 7 to move back and forth along the second slide 4, and the above-mentioned electric push rod is an existing structure and will not be repeated here. The upper part of the support rod 11 is set to a gear shape, which serves as the lower bottom of the lower mold 8, supports the metal powder, and cooperates with the upper mold on the first slide 3 to complete the pressing of the gear.

[0021] Working process: When using this device to carry out powder metallurgy, the staff first starts this device through the control system, then fills the metal powder into the feed box, uses the feeder to feed the metal powder into the feed box 7 through the hose, and then the control system starts the electric push rod on the rear side of the feed box 7. The feed box 7 moves forward under the drive of the electric push rod, and the metal powder in the feed box 7 moves forward at the same time. In the process of the feed box 7 moving forward, until the feed box 7 completely covers the lower mold 8, the electric push rod on the rear side of the feed box 7 stops moving and allows the metal powder in the feed box 7 to fall into the lower mold 8. , the control system starts the second hydraulic rod 18, the telescopic end of the second hydraulic rod 18 drives the sliding frame 16 to move forward, the sliding frame 16 slides forward along the guide rail 15, the sliding frame 16 drives the first rack 17 to move forward synchronously, the first rack 17 drives the one-way gear 13 to rotate, the one-way gear 13 drives the support rod 11 to rotate, the upper part of the support rod 11 drives the lower mold 8 to rotate, the lower mold 8 rotates between the second slide plate 4 cover plate 9, and the torsion spring 14 twists and stores force. In the above process, as the first rack 17 continues to move forward, until the first rack 17 loses engagement with the one-way gear 13.

[0022] After the one-way gear 13 loses engagement with the first rack 17, under the elastic force of the torsion spring 14, the support rod 11 rotates in the opposite direction, and the upper part of the support rod 11 drives the lower mold 8 to rotate. The lower mold 8 rotates instantly, so that the metal powder falling into the lower mold 8 is subjected to the centrifugal force. The metal powder adheres to the inner side of the lower mold 8 under the action of the centrifugal force, and the metal powder enters the tooth groove of the lower mold 8 and fills it. During the rotation of the lower mold 8, the metal powder in the feed box 7 continues to flow into the lower mold 8 until the lower mold 8 is filled. Then the control system controls the electric push rod on the rear side of the feed box 7 to reset its telescopic end. The electric push rod drives the feed box 7 to move backward and reset. The upper side of the metal powder in the lower mold 8 is flush with the second slide plate 4. After the lower mold 8 stops rotating, under the action of the torsion spring 14, the lower mold 8 and the support rod 11 are reset to the initial state.

[0023] After the feeding box 7 is completely reset, the control system starts the main hydraulic cylinder 2, and the telescopic end of the main hydraulic cylinder 2 drives the first slide plate 3 to slide downward along the four columns, and the upper mold on the first slide plate 3 is inserted into the lower mold 8. Under the supporting force of the support rod 11, the extrusion of the metal powder is completed, and then the control system controls the telescopic end of the main hydraulic cylinder 2 to move upward and reset, and the control system starts the two first hydraulic rods 5, and the telescopic ends of the two first hydraulic rods 5 drive the second slide plate 4 to move downward, and the second slide plate 4 slides downward along the four columns, the second slide plate 4 and the parts thereon move downward, and the lower mold 8 slides downward along the support rod 11, and the support rod 11 pushes out the gear pressed in the lower mold 8. In the above process, the telescopic end of the second hydraulic rod 18 drives the sliding frame 16 and the first rack 17 to slide backward and reset. During the backward movement of the first rack 17, the sliding frame 16 cannot drive the support rod 11 to rotate. After the sliding frame 16 and the first rack 17 are reset, the second hydraulic rod 18 is closed.

[0024] After the support rod 11 pushes out the pressed gear, the control system starts the electric push rod of the feeding box 7 again. During the forward movement of the feeding box 7, the front part of the feeding box 7 squeezes the gear forward, causing the gear to slide along the sieve plate on the front side of the second slide plate 4. Then the control system controls the telescopic ends of the two first hydraulic rods 5 to reset again, and the lower mold 8 starts to slide upward along the support rod 11. The metal powder in the feeding box 7 enters the lower mold 8, and then the above operation is repeated again to make the telescopic end of the second hydraulic rod 18 move forward again, thereby causing the lower mold 8 to rotate again, completing the filling of the metal powder. When the device needs to stop working, it only needs to be turned off through the control system.

[0025] Embodiment 2: Based on embodiment 1, Figure 4As shown, it also includes: a dust cover 12, which is fixed to the upper side of the second slide plate 4 by bolts, and the dust cover 12 is rotatably connected to the lower mold 8. The dust cover 12 is used to seal the gap between the second slide plate 4 and the lower mold 8.

[0026] like Figure 6-Figure 9 As shown, it also includes: a correction mechanism, which is arranged on the fixed seat 10 and is used to correct the position of the support rod 11. The correction mechanism includes: a fixed ring 19, which is fixedly connected to the upper side of the fixed seat 10 through a mounting seat, the fixed ring 19 is provided with three slide grooves, and the three slide grooves of the fixed ring 19 are all slidably connected to a limiting block 20, and the outer wall of the support rod 11 is provided with three limiting holes, and the limiting block 20 is fixedly connected to a sliding column 21, and the sliding column 21 is slidably connected to the fixed ring 19; a gear ring 22, which is rotatably connected to the fixed ring 19, and a torsion spring 24 is fixedly connected between the gear ring 22 and the fixed ring 19, and the gear ring 22 is provided with three inclined through grooves, and the sliding column 21 is located in the inclined through grooves adjacent to the gear ring 22 and slides; a second rack 23, which is fixedly connected to the sliding frame 16, and the second rack 23 is located at the same height as the gear ring 22, the second rack 23 is transmission connected with the gear ring 22, the first rack 17 and the second rack 23 have the same shape, the first rack 17 and the second rack 23 are placed in opposite positions and the teeth of both are facing the support rod 11, the limit block 20 is provided with a plurality of inclined surfaces, and the width of the inner ends of the three limit blocks 20 is smaller than the width of the outer ends thereof, the height of the limit hole of the support rod 11 is greater than the height of the limit block 20, so that the limit block 20 is convenient to be inserted into the limit hole of the support rod 11, and the shape of the limit hole of the support rod 11 is the same as that of the limit block 20, the limit block 20 is set to a hard and wear-resistant metal material to improve the accuracy of correcting the support rod 11, and the central axes of the fixing ring 19 and the gear ring 22 coincide with the central axis of the support rod 11.

[0027] In the above scheme, the main purpose is to ensure the matching accuracy between the lower mold 8 and the upper mold on the first slide 3, reduce the wear between the lower mold 8 and the upper mold on the first slide 3, and then improve the accuracy of the pressed gear. The central axis of the fixed ring 19 and the gear ring 22 coincides with the central axis of the support rod 11. Initially, the limit block 20 does not contact the limit hole of the support rod 11. In order to ensure the correction accuracy of the limit block 20 to the support rod 11, a protective film can be installed between the gear ring 22 and the support rod 11, and a protective film can also be installed between the fixed ring 19 and the support rod 11 to prevent metal powder from sticking to the limit block 20.

[0028] Working process: During the process of the sliding frame 16 moving forward along the guide rail 15, the sliding frame 16 drives the first rack 17 and the second rack 23 to move forward synchronously. After the first rack 17 loses meshing with the one-way gear 13, the second rack 23 has not yet meshed with the gear ring 22. After the first rack 17 loses meshing with the one-way gear 13 and the torsion spring 14 drives the support rod 11 to rotate and reset, the feeding box 7 begins to reset. During the process of the feeding box 7 resetting, the second hydraulic rod 18 continues to drive the sliding frame 16 to move forward, thereby causing the second rack 23 to mesh with the gear ring 22. The toothed rack 23 is meshed with the toothed ring 22, and the second toothed rack 23 drives the toothed ring 22 to rotate along the fixed ring 19, and the torsion spring 24 is twisted to store force. During the rotation of the toothed ring 22, the inclined through groove of the toothed ring 22 squeezes the sliding column 21 inside it, and the sliding column 21 drives the limit block 20 fixed thereto to slide along the sliding groove of the fixed ring 19. At this time, the three limit blocks 20 move close to each other. During the movement of the limit blocks 20, taking the limit block 20 on the left as an example, the limit block 20 moves to the right and is inserted into the limit hole at the relative position of the support rod 11. , until the limit block 20 is inserted into the limit hole of the support rod 11, under the action of the three limit blocks 20, the position of the support rod 11 is corrected to avoid the relative position deviation between the lower mold 8 and the upper mold on the first slide 3, thereby causing the lower mold 8 and the upper mold on the first slide 3 to be misaligned, causing mold wear and resulting in gear accuracy deviation, and even the lower mold 8 and the upper mold on the first slide 3. The impact is damaged, and when the telescopic end of the main hydraulic cylinder 2 drives the first slide 3 to move upward, the control system The telescopic end of the second hydraulic rod 18 is controlled to drive the sliding frame 16 to move backward, and the sliding frame 16 drives the first rack 17 and the second rack 23 to move backward, and the second rack 23 drives the gear ring 22 to rotate counterclockwise, and the gear ring 22 drives the three limit blocks 20 to reset by using the inclined through groove. When the second rack 23 loses engagement with the gear ring 22, the first rack 17 engages with the outer ring of the one-way gear 13, and the outer ring of the one-way gear 13 starts to rotate counterclockwise until the sliding frame 16 is reset to the initial state, and the control system then closes the second hydraulic rod 18.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic loading and unloading hydraulic press, comprising: A base (1), wherein the base (1) is fixedly connected to a main hydraulic cylinder (2) via four columns, a first slide plate (3) and a second slide plate (4) are slidably connected to the four columns of the base (1), the second slide plate (4) is provided with a through hole, and a telescopic end of the main hydraulic cylinder (2) is fixedly connected to the first slide plate (3); Two first hydraulic rods (5) are provided, respectively fixed to two sides of the main hydraulic cylinder (2), and their telescopic ends are fixed to the second slide plate (4); A support plate (6) is fixedly connected to one side of the second slide plate (4), and a feeding box (7) is slidably connected to the support plate (6), wherein: Also included are: A lower mold (8) is arranged in the through hole of the second slide plate (4); a cover plate (9) is fixedly connected to the lower side of the second slide plate (4); the lower mold (8) is rotatably connected to the second slide plate (4) and the cover plate (9); and the first slide plate (3) is fixedly connected to the upper mold; A fixed seat (10) is fixedly connected to the base (1), and the fixed seat (10) is rotatably connected to a support rod (11), and the upper part of the support rod (11) is located in the lower mold (8); A driving assembly is arranged on the base (1) and is used to drive the support rod (11) and the lower mold (8) to rotate.

2. According to the automatic loading and unloading hydraulic press of claim 1, it is characterized in that: The shape of the upper portion of the support rod (11) is the same as the shape of the inner cavity of the lower mold (8), and the upper portion of the support rod (11) is slidably connected to the lower mold (8).

3. The automatic loading and unloading hydraulic press according to claim 1 is characterized in that: The second slide plate (4) is fixedly connected to two symmetrically distributed limiting rails for guiding the feeding box (7), and the feeding box (7) is provided with a buffer block for buffering the impact force between the feeding box (7) and the pressed embryo.

4. The automatic loading and unloading hydraulic press according to claim 1 is characterized in that: The drive assembly comprises: A one-way gear (13) is fixedly connected to the support rod (11), and a torsion spring (14) is fixedly connected between the one-way gear (13) and the fixing seat (10); A guide rail (15) is fixedly connected to the base (1); a sliding frame (16) is slidably connected inside the guide rail (15); a first rack (17) is fixedly connected to the sliding frame (16); and the first rack (17) is drivingly connected to the one-way gear (13); The second hydraulic rod (18) is fixedly connected to the base (1), and the telescopic end of the second hydraulic rod (18) is fixedly connected to the sliding frame (16).

5. The automatic loading and unloading hydraulic press according to claim 4 is characterized in that: Also included are: A dust cover (12), the dust cover (12) is fixedly connected to the upper side of the second slide plate (4), the dust cover (12) is rotatably connected to the lower mold (8), and the dust cover (12) is used to seal the gap between the second slide plate (4) and the lower mold (8).

6. The automatic loading and unloading hydraulic press according to claim 5 is characterized in that: Also included are: A correction mechanism is arranged on the fixing seat (10) and is used to correct the position of the support rod (11), the correction mechanism comprising: A fixing ring (19) is fixedly connected to the upper side of the fixing seat (10) via a mounting seat, the fixing ring (19) is provided with a plurality of sliding grooves, the plurality of sliding grooves of the fixing ring (19) are all slidably connected to a limiting block (20), the outer wall of the support rod (11) is provided with a plurality of limiting holes, the limiting block (20) is fixedly connected to a sliding column (21), and the sliding column (21) is slidably connected to the fixing ring (19); A gear ring (22) is rotatably connected to the fixing ring (19), a second torsion spring (24) is fixedly connected between the gear ring (22) and the fixing ring (19), the gear ring (22) is provided with a plurality of inclined through grooves, and the sliding column (21) is located in the adjacent inclined through grooves of the gear ring (22) and slides; The second rack (23) is fixedly connected to the sliding frame (16); the second rack (23) and the gear ring (22) are located at the same height; the second rack (23) and the gear ring (22) are transmission-connected.

7. The automatic loading and unloading hydraulic press according to claim 6 is characterized in that: The first rack (17) and the second rack (23) have the same shape, the first rack (17) and the second rack (23) are placed in opposite positions and the teeth of both racks face the support rod (11).

8. The automatic loading and unloading hydraulic press according to claim 6 is characterized in that: The limiting block (20) is provided with a plurality of inclined surfaces, and the width of one end of the limiting block (20) close to the support rod (11) is smaller than the width of the other end.

9. The automatic loading and unloading hydraulic press according to claim 6 is characterized in that: The height of the limiting hole of the support rod (11) is greater than the height of the limiting block (20), and the shape of the limiting hole of the support rod (11) is the same as that of the limiting block (20).

10. The automatic loading and unloading hydraulic press according to claim 9, characterized in that: The limit block (20) is made of a hard and wear-resistant metal material, and the central axes of the fixing ring (19) and the gear ring (22) coincide with the central axis of the support rod (11).

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