Hydraulic machine device with constant pressure adjustment function

Abstract

The application discloses a hydraulic machine device with constant pressure adjustment function, which comprises a base, a cross beam fixedly connected to the base through a stand column, a hydraulic oil cylinder fixedly connected to the cross beam, a lifting rod liftingly connected in the hydraulic oil cylinder, a first pressing plate fixedly connected to the bottom end of the lifting rod, a hydraulic mechanism and a constant pressure mechanism arranged on the hydraulic oil cylinder and used for driving the lifting rod to drive the first pressing plate to move downward or upward, and a one-way drain valve of the constant pressure mechanism is automatically opened when the pressure in the hydraulic oil cylinder is abnormally increased, so that the excessive hydraulic oil is guided back to a hydraulic oil tank through an L-shaped liquid passage hole and a drain pipe, constant pressure protection is realized, a buffer mechanism and an auxiliary mechanism are arranged, the buffer mechanism is used for reducing the initial impact force when the first pressing plate is pressed downward through a return spring, the auxiliary mechanism is used for driving a gas circuit to be switched through a lifting action, and the device is used for automatically blowing off the workpieces adhered to the pressing plate, and the device can automatically maintain constant pressure when a control system fails, and safety accidents such as cylinder body burst or oil pipe collapse can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of hydraulic press technology, specifically to a hydraulic press device with constant pressure adjustment function. Background Technology

[0002] As a heavy-duty processing equipment that transmits energy through high-pressure liquid, hydraulic presses typically operate at pressures of tens or even hundreds of megapascals. The accumulated mechanical energy poses a high potential danger. During the processes of workpiece forming, pressing, and pressure holding, ensuring that the hydraulic press has adjustable and constant pressure control capabilities under various working conditions (especially in emergency situations), as well as rapid and reliable pressure relief and action stopping capabilities, is crucial for protecting the personal safety of operators and preventing mold damage and equipment overload.

[0003] A Chinese patent with publication number CN117212288A includes a base plate, a mounting plate, a side plate, a hydraulic press, support rods, a conveying pipe, and a hydraulic cylinder. The side plate is fixedly mounted on the side of the mounting plate, the hydraulic press is fixedly mounted on the top of the side plate, the conveying pipe is fixedly mounted on the back of the hydraulic press, and the hydraulic cylinder is fixedly mounted on the side of the conveying pipe. A pressure gauge is fixedly mounted on the top of the hydraulic cylinder, and the bottom of the pressure gauge is attached to a placement plate. Support rods are fixedly connected to the inside of both sides of the placement plate, and the base plate is fixedly mounted on the bottom of the support rods. The bottom of the base plate and the top of the mounting plate are fixedly connected. An extrusion head is movably mounted on the bottom of the hydraulic cylinder. The characteristic feature is that a limit mechanism is provided on the outer wall of the placement plate.

[0004] When the above-mentioned device is in use, the counterweight moves in the opposite direction through the limiting mechanism. This causes the bottom rod fixedly connected to the outer wall of the counterweight to rotate the rotating shaft in the opposite direction, causing the side rod fixedly connected to the top of the rotating shaft to move forward. As a result, the side rod will be inserted into the inside of the limiting side opening, thus playing a lateral limiting role. However, in actual use, existing hydraulic presses mostly use a pressure sensor + programmable controller (PLC) + proportional relief valve or servo variable pump to form a closed-loop constant pressure control system. When the control system malfunctions, it is easy to crash or the program will run away, causing the controller to misjudge and the hydraulic cylinder cannot stop or adjust in time, resulting in the safety hazard of cylinder rupture or high-pressure oil pipe detachment.

[0005] Therefore, we propose a hydraulic press device with constant pressure adjustment function. Summary of the Invention

[0006] The purpose of this invention is to provide a hydraulic press device with a constant pressure adjustment function, which has the advantage of automatically adjusting the constant pressure of the hydraulic press and solves the problems in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic press device with constant pressure adjustment function, comprising a base supported on the ground, columns fixedly connected to the four corners of the base, crossbeams fixedly connected to the ends of the four columns, a hydraulic cylinder being passed through and fixedly connected to the crossbeams, a lifting rod being passed through and movably connected to the hydraulic cylinder for reciprocating lifting and lowering, a first pressure plate for pressing the workpiece being fixedly connected to the bottom end of the lifting rod, and the four corners of the first pressure plate being passed through and movably connected to the columns, the hydraulic cylinder being provided with a hydraulic mechanism for guiding the lifting rod to drive the first pressure plate to press down or move up and a constant pressure mechanism for automatically adjusting the constant pressure of the first pressure plate.

[0008] Preferably, the hydraulic mechanism includes a first oil supply pipe and a second oil supply pipe that are symmetrically connected to both ends of the outer contour of the hydraulic cylinder, and a first piston plate that moves up and down and reciprocates is movably connected to the inner wall of the hydraulic cylinder, and the first piston plate is connected to and fixedly connected by a lifting rod.

[0009] Preferably, the hydraulic mechanism further includes a hydraulic oil tank for storing hydraulic oil, and a hydraulic pump that delivers hydraulic oil to both ends of the hydraulic cylinder is fixedly connected to the hydraulic oil tank. The input end of the hydraulic pump extends through the inner wall of the hydraulic oil tank and is fixedly connected. The ends of the first oil delivery pipe and the second oil delivery pipe that are away from the hydraulic cylinder are fixedly connected to the output end of the hydraulic pump, respectively.

[0010] Preferably, the constant pressure mechanism includes an L-shaped fluid passage at the top of the lifting rod for draining hydraulic oil from the hydraulic cylinder. The inner wall of the top of the L-shaped fluid passage is fixedly connected to a drain pipe for controlling the constant pressure of the first pressure plate. The end of the drain pipe away from the lifting rod extends through to the inner wall of the hydraulic oil tank and is fixedly connected.

[0011] Preferably, a one-way drain valve for quantitatively discharging high-pressure hydraulic oil from the hydraulic cylinder is fixedly connected to the inner wall of the L-shaped fluid passage at the end away from the drain pipe, and a limiting block for stably discharging high-pressure hydraulic oil from the hydraulic cylinder through the L-shaped fluid passage is fixedly connected to the outer contour of the top of the lifting rod.

[0012] Preferably, the first pressure plate is provided with a buffer mechanism to reduce the impact force of the first pressure plate pressing down. The buffer mechanism includes two sets of lifting tubes that are symmetrically connected to both ends of the first pressure plate and can be raised and lowered. A second pressure plate that squeezes the workpiece is fixedly connected to the outer contour of the bottom end of the two sets of lifting tubes. A support groove is opened at the bottom of the first pressure plate. A reset spring that reduces the impact force of the first pressure plate pressing down is fixedly connected to the support groove and the surface opposite to the second pressure plate.

[0013] Preferably, the first pressure plate is provided with an auxiliary mechanism for separating the workpiece from the second pressure plate. The auxiliary mechanism includes two sets of cylindrical shells fixedly connected to the two ends of the first pressure plate at positions corresponding to the lifting tubes. Each set of cylindrical shells is connected to the lifting tubes at corresponding positions by being penetrated and moved up and down.

[0014] Preferably, each set of lifting pipes is fixedly connected to a second piston plate for suction or exhaust, and the second piston plate is attached to the inner wall of the cylindrical housing and is connected for lifting and lowering movement. Each set of cylindrical housings has a second vent hole on the outer contour near the bottom end, and each set of lifting pipes has a first vent hole on the outer contour near the end. The inner walls of each set of second vent holes and first vent holes are respectively fixedly connected to a one-way air inlet valve and a one-way exhaust valve for the lifting pipe to blow the workpiece off the second pressure plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. When the lifting rod pushes the first pressure plate down to its limit position, the limit block abuts against the top of the hydraulic cylinder. At the same time, the one-way drain valve enters the inner wall of the top of the hydraulic cylinder. If the control system malfunctions or the program runs out of control, causing the hydraulic pump to continuously supply hydraulic oil to the top of the hydraulic cylinder, the pressure inside the cylinder will rise abnormally. At this time, the one-way drain valve will automatically open under pressure, allowing the excess high-pressure oil to flow back directly to the hydraulic oil tank through the L-shaped liquid passage and drain pipe. This effectively prevents serious safety accidents such as cylinder rupture or high-pressure oil pipe detachment caused by excessive pressure, and ensures that the first pressure plate can maintain constant pressure under unexpected working conditions.

[0017] Second, when the first pressure plate is pressed down with the lifting rod, the second pressure plate first contacts the workpiece and is pre-pressed. During this process, the return spring is gradually compressed, absorbing and buffering the instantaneous impact energy generated when the first pressure plate just contacts the workpiece. After the return spring is compressed to its limit and the first and second pressure plates come into contact, the workpiece is then fully pressed and formed. This avoids the damage problems such as cracking and deformation caused by the direct impact of the rigid pressure plate on the workpiece in traditional hydraulic presses. At the same time, when the lifting rod drives the first pressure plate to move up and reset, the return spring slowly releases its elastic potential energy in a controlled manner, so that the second pressure plate and the workpiece are gradually separated, avoiding the risk of secondary injury caused by the sudden release of elastic potential energy and the workpiece flying out.

[0018] 3. When the first pressure plate presses down and compresses the return spring, the second piston plate inside the cylindrical housing moves upward relative to the first, creating a negative pressure at the bottom of the cylindrical housing. The one-way air inlet valve opens, and external air is drawn into the cylindrical housing. When the first pressure plate moves up and returns to its original position, the second piston plate moves downward relative to the first, turning the bottom of the cylindrical housing into a positive pressure. The one-way exhaust valve opens, and the air stored inside the cylindrical housing is discharged downward at high speed through the inner wall of the lifting pipe, directly blowing onto the surface of the workpiece. This automatically blows off the workpiece that has adhered to the bottom of the second pressure plate after pressing, thus achieving automatic separation of the workpiece from the pressure plate.

[0019] The combined use of the above structures solves the safety hazard problem that, in actual use, when the control system malfunctions, the existing device is prone to crashing or program overload, causing the controller to misjudge and the hydraulic cylinder to fail to stop or adjust in time, leading to cylinder rupture or high-pressure oil pipe detachment. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a three-dimensional cross-sectional view of the part where the crossbeam of the present invention is located;

[0022] Figure 3 This is a three-dimensional cross-sectional view of the part where the hydraulic cylinder of this invention is located;

[0023] Figure 4 This is a partial cross-sectional view of the three-dimensional structure of the lifting rod part of the present invention;

[0024] Figure 5 For the present invention Figure 4 Schematic diagram of the structure at point A in the middle;

[0025] Figure 6 This is a three-dimensional cross-sectional view of the part where the first pressure plate of the present invention is located;

[0026] Figure 7 This is a three-dimensional cross-sectional view of the portion of the cylindrical shell of the present invention;

[0027] Figure 8 For the present invention Figure 7 Schematic diagram of the structure at point B;

[0028] Figure 9 This is an exploded three-dimensional structural diagram of the location of the lifting pipe in this invention.

[0029] In the diagram: 1. Base; 2. Column; 3. Crossbeam; 4. Hydraulic cylinder; 5. Lifting rod; 501. L-shaped fluid passage hole; 6. First pressure plate; 601. Support groove; 7. First oil supply pipe; 8. Second oil supply pipe; 9. First piston plate; 10. Hydraulic oil tank; 11. Hydraulic pump; 12. One-way drain valve; 13. Drain pipe; 14. Limit block; 15. Lifting pipe; 151. First vent hole; 16. Second pressure plate; 17. Return spring; 18. Cylindrical housing; 181. Second vent hole; 19. Second piston plate; 20. One-way air intake valve; 21. One-way air exhaust valve. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1:

[0032] Please see Figures 1 to 9 This invention provides a technical solution: a hydraulic press device with constant pressure adjustment function, including a base 1 supported on the ground, with columns 2 fixedly connected to the four corners of the base 1, and crossbeams 3 fixedly connected to the ends of the four columns 2. A hydraulic cylinder 4 is passed through and fixedly connected to the crossbeam 3, and a lifting rod 5 for reciprocating movement is passed through and movably connected to the hydraulic cylinder 4. A first pressure plate 6 for pressing the workpiece is fixedly connected to the bottom end of the lifting rod 5, and the four corners of the first pressure plate 6 are passed through and movably connected to the columns 2. The hydraulic cylinder 4 is equipped with a hydraulic mechanism for guiding the lifting rod 5 to drive the first pressure plate 6 to press down or move up, and a constant pressure mechanism for automatically adjusting the constant pressure of the first pressure plate 6.

[0033] In use, a base 1 is provided, with a column 2 and a crossbeam 3 mounted on it. The column 2 securely supports the crossbeam 3 on the base 1, while the base 1 stably supports the column 2 and crossbeam 3 on the ground, ensuring the stability of the crossbeam 3. A hydraulic cylinder 4 mounted on the crossbeam 3 is fixedly supported on it, and a lifting rod 5 mounted on the hydraulic cylinder 4 allows for vertical movement. A first pressure plate 6 mounted on the lifting rod 5 is used to press the first pressure plate 6... The first pressure plate 6 is fixedly supported on the lifting rod 5, and the column 2 supports the movement direction of the first pressure plate 6. Through the hydraulic mechanism and constant pressure mechanism set on the hydraulic cylinder 4, the hydraulic mechanism can control the lifting rod 5 and drive the first pressure plate 6 to press down or move up. At the same time, the constant pressure mechanism can adjust the first pressure plate 6 to maintain a constant pressure, improve the safety of the hydraulic press, and avoid the safety hazards of the controller failing to stop or adjust in time due to the controller misjudging the situation, such as the system crashing or the program running away, causing the cylinder to burst or the high-pressure oil pipe to detach.

[0034] Example 2:

[0035] Building upon Example 1, the following is a further step:

[0036] The hydraulic mechanism includes a first oil supply pipe 7 and a second oil supply pipe 8 that are symmetrically connected to both ends of the outer contour of the hydraulic cylinder 4. The inner wall of the hydraulic cylinder 4 is movably connected to a first piston plate 9 that moves up and down and reciprocates. The first piston plate 9 is connected to and is fixedly connected to the lifting rod 5.

[0037] The hydraulic mechanism also includes a hydraulic oil tank 10 for storing hydraulic oil. A hydraulic pump 11 is fixedly connected to the hydraulic oil tank 10 to deliver hydraulic oil to both ends of the hydraulic cylinder 4. The input end of the hydraulic pump 11 extends through the inner wall of the hydraulic oil tank 10 and is fixedly connected. The ends of the first oil pipe 7 and the second oil pipe 8 away from the hydraulic cylinder 4 are fixedly connected to the output end of the hydraulic pump 11.

[0038] In use, the first oil supply pipe 7 and the second oil supply pipe 8 provided on the hydraulic cylinder 4 can be connected to the inner walls at both ends of the hydraulic cylinder 4 respectively. The first piston plate 9 provided on the hydraulic cylinder 4 can be attached to and movably connected to the inner wall of the hydraulic cylinder 4. The first piston plate 9 is fixedly supported on the lifting rod 5, so the lifting rod 5 can drive the first piston plate 9 to move up and down synchronously on the inner wall of the hydraulic cylinder 4.

[0039] By setting up a hydraulic oil tank 10, hydraulic oil is first stored inside the hydraulic oil tank 10. A hydraulic pump 11 mounted on the hydraulic oil tank 10 is fixedly supported on it. The output end of the hydraulic pump 11 extends through to the inner wall of the hydraulic oil tank 10 and contacts the hydraulic oil. Both the first oil delivery pipe 7 and the second oil delivery pipe 8 are connected to the output end of the hydraulic pump 11. When the hydraulic pump 11 is started, it draws hydraulic oil from inside the hydraulic oil tank 10 and delivers it to the first oil delivery pipe 7 or the second oil delivery pipe 8 through a reversing valve. When pressure is applied, the hydraulic pump 11 delivers hydraulic oil to the second oil delivery pipe 8. The second oil supply pipe 8 can deliver hydraulic oil to the inner wall of the top of the hydraulic cylinder 4. At this time, the top of the hydraulic cylinder 4 is under positive pressure, so the first piston plate 9 can drive the lifting rod 5 and move the first pressure plate 6 downward to squeeze the workpiece. When moving upward, and the hydraulic pump 11 delivers hydraulic oil to the first oil supply pipe 7, the first oil supply pipe 7 can deliver hydraulic oil to the inner wall of the bottom of the hydraulic cylinder 4. At this time, the bottom of the hydraulic cylinder 4 is under positive pressure, and then the first piston plate 9 can drive the lifting rod 5 to move the first pressure plate 6 upward to reset, thus realizing the squeezing of the workpiece. The above structure is the prior art known to those skilled in the art, so it will not be described in detail here.

[0040] Example 3:

[0041] Building upon Example 2, the following is a further step:

[0042] The constant pressure mechanism includes an L-shaped fluid passage 501 at the top of the lifting rod 5 for draining hydraulic oil from the hydraulic cylinder 4. The inner wall of the top of the L-shaped fluid passage 501 is fixedly connected to a drain pipe 13 for controlling the constant pressure of the first pressure plate 6. The end of the drain pipe 13 away from the lifting rod 5 extends through to the inner wall of the hydraulic oil tank 10 and is fixedly connected.

[0043] The inner wall of the L-shaped liquid passage 501 away from the drain pipe 13 is fixedly connected to a one-way drain valve 12 for quantitatively discharging the high-pressure hydraulic oil inside the hydraulic cylinder 4. The outer contour of the top of the lifting rod 5 is fixedly connected to a limiting block 14 for the L-shaped liquid passage 501 to stably discharge the high-pressure hydraulic oil inside the hydraulic cylinder 4.

[0044] In use, the L-shaped liquid passage hole 501 opened on the lifting rod 5 and the drain pipe 13 provided on the L-shaped liquid passage hole 501 can fix and support the inner wall of the L-shaped liquid passage hole 501 and be in a connected state. At the same time, the drain pipe 13 can connect the L-shaped liquid passage hole 501 with the inner wall of the hydraulic oil tank 10.

[0045] The one-way drain valve 12, provided on the L-shaped liquid passage 501, is fixedly supported on the inner wall of the L-shaped liquid passage 501. Initially, the one-way drain valve 12 is closed. The limiting block 14, provided on the lifting rod 5, is fixedly supported on the outer contour of the lifting rod 5. In actual use, as the second oil supply pipe 8 delivers hydraulic oil to the top of the hydraulic cylinder 4 and pushes the lifting rod 5 and the first pressure plate 6 down to their limit positions, the limiting block 14 moves down and abuts against the top of the hydraulic cylinder 4, thus supporting the lifting rod 5. Simultaneously, the one-way drain valve 12 moves down to the inner wall of the top of the hydraulic cylinder 4. When a malfunction occurs and the second oil supply pipe 8 continues to supply hydraulic oil to the top of the hydraulic cylinder 4, the pressure at the top of the hydraulic cylinder 4 increases accordingly. At this time, the one-way drain valve 12 opens, allowing excess hydraulic oil at the top of the hydraulic cylinder 4 to return to the hydraulic oil tank 10 through the L-shaped liquid passage 501 and the drain pipe 13, ensuring that the first pressure plate 6 maintains a constant pressure, avoiding the safety hazards of cylinder rupture or high-pressure oil pipe detachment, and further improving the safety and stability of the hydraulic press.

[0046] Example 4:

[0047] Building upon Example 3, the following is a further step:

[0048] The first pressure plate 6 is provided with a buffer mechanism to reduce the impact force of the first pressure plate 6 pressing down. The buffer mechanism includes two sets of lifting tubes 15 that are symmetrically connected to both ends of the first pressure plate 6 and can be raised and lowered. The outer contour of the bottom end of the two sets of lifting tubes 15 is fixedly connected to a second pressure plate 16 that squeezes the workpiece. The bottom of the first pressure plate 6 is provided with a support groove 601. The support groove 601 and the surface opposite to the second pressure plate 16 are fixedly connected to a return spring 17 to reduce the impact force of the first pressure plate 6 pressing down.

[0049] In use, the lifting tube 15 provided on the first pressure plate 6 can be lifted and moved on the first pressure plate 6. The second pressure plate 16 provided on the lifting tube 15 is fixedly supported on the outer contour of the lifting tube 15. The support groove 601 opened on the first pressure plate 6 and the return spring 17 provided on the second pressure plate 16 can support the return spring 17 under its own elastic force.

[0050] In actual use, such as Figure 1 , Figure 2 and Figure 6As shown, in the initial state, the return spring 17 pushes the second pressure plate 16 to extend to the working state. When the lifting rod 5 drives the first pressure plate 6 to press down, the first pressure plate 6 can synchronously drive the second pressure plate 16 to move down. As the second pressure plate 16 moves down and comes into contact with the workpiece, the first pressure plate 6 moves down and squeezes the return spring 17. This allows the return spring 17 to absorb and buffer the instantaneous impact energy generated when the first pressure plate 6 comes into contact with the workpiece. The return spring 17 contracts and increases the pressure on the second pressure plate 16, so that the second pressure plate 16 can pre-press the workpiece. As the return spring 17 is compressed to its limit and the first pressure plate 6 comes into contact with the second pressure plate 16, the first pressure plate 6 can push the second pressure plate 16 to fully press and form the workpiece. Thus, the return spring 17 can buffer the extrusion impact force when the first pressure plate 6 comes into contact with the workpiece, improve the extrusion quality of the workpiece, and avoid the problem of the workpiece being damaged by the extrusion impact force.

[0051] When the lifting rod 5 moves the first pressure plate 6 upward to reset, and the reset spring 17 is slowly released, the second pressure plate 16 remains in contact with the workpiece under the action of the reset spring 17, and the second pressure plate 16 gradually separates from the workpiece. During the release process, the reset spring 17 can reduce the elastic potential energy accumulated on the second pressure plate 16, thus avoiding the problem of the workpiece flying out due to the sudden release of the elastic potential energy accumulated on the second pressure plate 16.

[0052] Example 5:

[0053] Building upon Example 4, the following is a further step:

[0054] The first pressure plate 6 is provided with an auxiliary mechanism to separate the workpiece from the second pressure plate 16. The auxiliary mechanism includes two sets of cylindrical shells 18 fixedly connected at both ends of the first pressure plate 6 and at corresponding positions of the lifting tube 15. Each set of cylindrical shells 18 is connected to the lifting tube 15 at the corresponding position by being penetrated and moved up and down.

[0055] Each set of lifting pipes 15 is fixedly connected to a second piston plate 19 for suction or exhaust. The second piston plate 19 is attached to the inner wall of the cylindrical housing 18 and is connected to it for lifting and lowering. Each set of cylindrical housings 18 has a second vent hole 181 on its outer contour near the bottom. Each set of lifting pipes 15 has a first vent hole 151 on its outer contour near the end. The inner walls of each set of second vent holes 181 and first vent holes 151 are respectively fixedly connected to a one-way air inlet valve 20 and a one-way exhaust valve 21 for the lifting pipe 15 to blow the workpiece off the second pressure plate 16.

[0056] In use, the cylindrical housing 18 is fixedly supported on the first pressure plate 6. Simultaneously, the lifting pipe 15 extends through the inner wall of the cylindrical housing 18 and is connected for lifting and lowering. The second piston plate 19, provided on the lifting pipe 15, is fixedly supported on the lifting pipe 15, allowing the second piston plate 19 to fit against the inner wall of the cylindrical housing 18. The first vent 151 and the second vent 151 on the lifting pipe 15 and the cylindrical housing 18 are connected. The first vent 151 and the second vent 181 are equipped with a one-way exhaust valve 21 and a one-way intake valve 20, respectively. The one-way exhaust valve 21 and the one-way intake valve 20 can be fixedly supported on the inner walls of the first vent 151 and the second vent 181. In actual use, as the first pressure plate 6 moves downward to press the return spring 17, and the lifting tube 15 and the second pressure plate 16 are stationary, the first pressure plate 6 can drive the cylindrical housing 18 towards the lifting tube 18. When the bottom end of tube 15 moves, the internal air pressure at the bottom end of the cylindrical shell 18 is in a negative pressure state under the action of the second piston plate 19, and the one-way inlet valve 20 is in the open state and the one-way exhaust valve 21 is in the closed state. Then the second piston plate 19 can draw external air into the interior of the cylindrical shell 18 through the second vent 181. When the first pressure plate 6 moves upward and resets, the first pressure plate 6 can drive the cylindrical shell 18 to reset towards the top end of the lifting tube 15 under the action of the reset spring 17. At this time, the internal air pressure at the bottom end of the cylindrical shell 18 is in a positive pressure state, and the one-way inlet valve 20 is in the closed state and the one-way exhaust valve 21 is in the open state. This allows the air inside the cylindrical shell 18 to be discharged at high speed through the first vent 151 and the lifting tube 15 and blown towards the workpiece surface at the bottom of the second pressure plate 16. Then the lifting tube 15 can blow the workpiece away from the bottom of the second pressure plate 16, realizing the automatic blowing off of the workpiece that has adhered to the bottom of the second pressure plate 16 after pressing.

[0057] Furthermore, the existing device can automatically adjust the constant pressure function of the hydraulic press during actual use, making it convenient to use and superior to traditional products.

[0058] The standard parts used in this embodiment can be purchased directly from the market, while the non-standard structural parts described in the specification and drawings can be processed directly based on existing technical knowledge without any doubt. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic press device with constant pressure adjustment function, characterized in that: The system includes a base (1) placed on the ground, with columns (2) fixedly connected to the four corners of the base (1). A crossbeam (3) is fixedly connected to the ends of the four columns (2). A hydraulic cylinder (4) is fixedly connected through the crossbeam (3). A lifting rod (5) for reciprocating movement is movably connected through the hydraulic cylinder (4). A first pressure plate (6) for pressing the workpiece is fixedly connected to the bottom end of the lifting rod (5). The four corners of the first pressure plate (6) are movably connected through the columns (2). The hydraulic cylinder (4) is equipped with a hydraulic mechanism that guides the lifting rod (5) to drive the first pressure plate (6) to press down or move up, and a constant pressure mechanism that automatically adjusts the constant pressure of the first pressure plate (6).

2. The hydraulic machine device with an adjusted constant pressure function according to claim 1, characterized in that: The hydraulic mechanism includes a first oil pipe (7) and a second oil pipe (8) that are symmetrically connected to both ends of the outer contour of the hydraulic cylinder (4). The inner wall of the hydraulic cylinder (4) is movably connected to a first piston plate (9) that moves up and down and reciprocates. The first piston plate (9) is connected to a lifting rod (5) that is tangentially connected to it.

3. A hydraulic press device with constant pressure adjustment function according to claim 2, characterized in that: The hydraulic mechanism also includes a hydraulic oil tank (10) for storing hydraulic oil. A hydraulic pump (11) is fixedly connected to the hydraulic oil tank (10) to deliver hydraulic oil to both ends of the hydraulic cylinder (4). The input end of the hydraulic pump (11) extends through the inner wall of the hydraulic oil tank (10) and is fixedly connected. The ends of the first oil pipe (7) and the second oil pipe (8) away from the hydraulic cylinder (4) are fixedly connected to the output end of the hydraulic pump (11).

4. A hydraulic press device with constant pressure adjustment function according to claim 3, characterized in that: The constant pressure mechanism includes an L-shaped fluid passage (501) at the top of the lifting rod (5) for draining hydraulic oil from the hydraulic cylinder (4). The inner wall of the top of the L-shaped fluid passage (501) is fixedly connected to a drain pipe (13) for controlling the constant pressure of the first pressure plate (6). The end of the drain pipe (13) away from the lifting rod (5) extends through to the inner wall of the hydraulic oil tank (10) and is fixedly connected.

5. A hydraulic press device with constant pressure adjustment function according to claim 4, characterized in that: The inner wall of the L-shaped liquid passage (501) away from the drain pipe (13) is fixedly connected to a one-way drain valve (12) for quantitative discharge of high-pressure hydraulic oil inside the hydraulic cylinder (4). A limiting block (14) is fixedly connected to the outer contour of the top of the lifting rod (5) for stable discharge of high-pressure hydraulic oil inside the hydraulic cylinder (4) by the L-shaped liquid passage (501).

6. A hydraulic press device with constant pressure adjustment function according to claim 1, characterized in that: The first pressure plate (6) is provided with a buffer mechanism to reduce the impact force of the first pressure plate (6) pressing down. The buffer mechanism includes two sets of lifting tubes (15) that are symmetrically connected to both ends of the first pressure plate (6) and move up and down. The outer contour of the bottom end of the two sets of lifting tubes (15) is fixedly connected to a second pressure plate (16) that squeezes the workpiece. The bottom of the first pressure plate (6) is provided with a support groove (601). The support groove (601) and the opposite surface of the second pressure plate (16) are fixedly connected to a reset spring (17) that reduces the impact force of the first pressure plate (6) pressing down.

7. A hydraulic press device with constant pressure adjustment function according to claim 6, characterized in that: The first pressure plate (6) is provided with an auxiliary mechanism for separating the workpiece from the second pressure plate (16). The auxiliary mechanism includes two sets of cylindrical shells (18) fixedly connected at both ends of the first pressure plate (6) and at corresponding positions of the lifting tube (15). Each set of cylindrical shells (18) is connected to the lifting tube (15) at the corresponding position by being penetrated and moved up and down.

8. A hydraulic press device with constant pressure adjustment function according to claim 7, characterized in that: Each set of lifting pipes (15) is fixedly connected to a second piston plate (19) for venting or venting. The second piston plate (19) is attached to the inner wall of the cylindrical shell (18) and is connected to the lifting and lowering mechanism. Each set of cylindrical shells (18) has a second vent hole (181) on its outer contour near the bottom. Each set of lifting pipes (15) has a first vent hole (151) on its outer contour near the end. The inner walls of each set of second vent holes (181) and first vent holes (151) are respectively fixedly connected to a one-way air inlet valve (20) and a one-way exhaust valve (21) for the lifting pipe (15) to blow the workpiece off the second pressure plate (16).

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