An integrated oil cylinder for hot press forming

Abstract

The present application relates to the field of oil cylinder forming, in particular to a kind of integrated oil cylinder for hot press forming.The cylinder body is formed with main oil passage in the middle, and the main oil passage is formed with auxiliary oil passage at equal intervals, and each auxiliary oil passage is formed with oil cavity at equal intervals;Each upper end is provided with a plug head fixedly connected with the cylinder body, the upper end of the plug head is fixedly connected with a pressure relief plug, a push rod is slidably arranged in the middle of the pressure relief plug, a pressure sensor is arranged at the lower end of the push rod, and a piston is arranged below the push rod;Each pressure relief plug is provided with a secondary road mechanism on the side, the secondary road mechanism includes a hydraulic pipe fixedly connected with the upper end of the cylinder body, two oil cavities of the same auxiliary oil passage are formed with a partition cavity on the close side, the partition cavity is movably sealed with a partition plate, the output end of the hydraulic pipe is communicated with the lower end of the partition cavity, and a liquid valve is arranged above the partition plate;The upper end of the partition plate is drivingly connected with the push rod.The main oil passage supplies oil when the device operates, the hydraulic pipe drives the partition plate to isolate the fault oil cavity after the pressure sensor detects abnormality, and simultaneously conducts the standby oil path, to avoid fault diffusion, and is suitable for hot press forming operation.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinder molding, and more specifically to an integrated hydraulic cylinder for hot pressing molding. Background Technology

[0002] Most existing hydraulic cylinders are independent cylinders. When installing these independent cylinders, operators need to adjust the coaxiality and parallelism of each cylinder individually to ensure that the piston rod end faces of all cylinders are on the same plane. This process relies on manual calibration, which is time-consuming and its accuracy is easily affected by the operation. By integrating multiple cylinders, it is possible to increase power while adjusting the number of cylinders to meet pressure requirements.

[0003] However, when multiple independent cylinders work together, because they are currently independent of each other, a failure in one cylinder will not affect the others. But when integrating multiple cylinders, because there is only one oil inlet, even with multiple branches connected in parallel, a problem in one branch will temporarily stabilize the pressure in the others. However, cylinders on the same branch are in series; if one cylinder fails, all cylinders on that branch will be affected. Even if other parallel branches are functioning normally, insufficient overall working area will reduce production capacity. Therefore, even though integrated cylinders have the advantages of a single cylinder body and interconnected internal oil circuits, cylinders connected in series on the same branch still lack a backup auxiliary oil circuit to buffer a failed cylinder. If a single cylinder in a series fails, and the faulty oil chamber cannot be buffered or isolated in time, the faulty cylinder may become stuck or burst due to instantaneous pressure, affecting the pressure distribution of the upstream and downstream oil chambers, and even causing the entire auxiliary oil passage to fail. In addition, the high pressure of the faulty cylinder can be transmitted in reverse to other normal cylinders through the series oil circuit, causing the oil pressure of the other cylinders in the branch to rise sharply, forcing the other cylinders to operate beyond their rated output. Even if these cylinders are not faulty, they will suffer from problems such as piston rod deformation and guide sleeve wear due to pressure overload, forming a vicious chain reaction.

[0004] Therefore, it is necessary to design an integrated hydraulic cylinder that is used for hot pressing and has a diversion and pressure reduction function. Summary of the Invention

[0005] Therefore, it is necessary to provide an integrated hydraulic cylinder for hot pressing to address the problems of existing technologies.

[0006] To solve the problems of the prior art, the technical solution adopted by the present invention is as follows:

[0007] An integrated hydraulic cylinder for hot pressing, comprising:

[0008] The cylinder block has a main oil passage formed through the middle. The main oil passage is formed with secondary oil passages at equal intervals along the axial direction. Each secondary oil passage has an oil cavity set vertically at equal intervals along the axial direction.

[0009] Each oil chamber is equipped with a pressure relief plug fixed to the cylinder body at the upper end, a plug head fixed to the lower end of the pressure relief plug, a push rod slidingly provided in the middle of the pressure relief plug, a pressure sensor fixed to the lower end of the push rod, and a piston connected to the dynamic seal of the oil chamber below the push rod.

[0010] Each pressure relief plug is provided with an auxiliary circuit mechanism on its side. The auxiliary circuit mechanism includes a hydraulic pipe fixed to the upper end of the cylinder body. A partition is formed on the side of the two oil chambers located in the same auxiliary oil passage that are close to each other. The partition is dynamically sealed with a partition plate. The output end of the hydraulic pipe is connected to the lower end of the partition. A hydraulic valve connecting the two pressure relief plugs is provided above the partition plate.

[0011] The upper end of the partition is connected to the push rod drive.

[0012] Furthermore, the lower part of the push rod is formed with liquid-blocking plugs arranged in an equal angle along the circumference, and the lower end of the plug is formed with a pressure relief hole that corresponds to the liquid-blocking plug. When the pressure in the oil chamber is within the normal range, the liquid-blocking plug and the pressure relief hole are connected. When the pressure in the oil chamber is abnormal, the liquid-blocking plug and the pressure relief hole are separated, and the pressure relief hole is connected to the oil chamber.

[0013] The pressure relief chamber is formed inside the stopper, and the liquid transfer chamber is formed inside the pressure relief plug. The pressure relief chamber and the liquid transfer chamber are connected.

[0014] Furthermore, the lower end of the push rod is formed with a tapered head.

[0015] Furthermore, the partition plate has a perforation formed in the middle, and when the pressure in the oil cavity is within the normal range, the perforation is set coaxially with the auxiliary oil passage.

[0016] Furthermore, two toothed racks are fixedly connected to the upper sides of the partition.

[0017] Furthermore, a valve core is rotatably connected to the middle of the liquid valve, and main gears are fixed to both ends of the valve core. The two main gears mesh with two main racks respectively.

[0018] Furthermore, the upper end of the pressure relief plug is fixedly connected to two wheel seats, and the two wheel seats are rotatably connected to a secondary gear on the side that is far apart from each other. The upward movement of the rack will drive the secondary gear to rotate.

[0019] A secondary gear is provided on the side of the secondary gear and is rotatably connected to the wheel seat. The radius of the secondary gear is much smaller than that of the secondary gear. The secondary gear meshes with the secondary gear. The secondary gear is coaxially fixed to the main pulley. An auxiliary pulley is rotatably arranged above the pressure relief plug. The auxiliary pulley is connected to the main pulley by belt drive.

[0020] Furthermore, the upper end of the pressure relief plug is provided with a bevel gear assembly. One end of the bevel gear assembly is coaxially fixed to the auxiliary pulley, and the other end is fixed to a screw rod, which is threadedly connected to the push rod.

[0021] Furthermore, two top plates are fixedly connected to the upper end of the partition plate. Each of the two top plates is equipped with a tension spring at the end near the cylinder body. One end of the tension spring is fixedly connected to the top plate, and the other end is fixedly connected to the cylinder body.

[0022] Furthermore, a warning light is provided at the upper end of the pressure relief plug, and the warning light is electrically connected to the pressure sensor.

[0023] The beneficial effects of this invention compared to the prior art are:

[0024] Firstly, this device uses an auxiliary circuit mechanism to prevent a single oil chamber failure in the series branch of the integrated hydraulic cylinder from causing an overall failure. When the pressure in a single oil chamber is abnormal, the hydraulic pipe drives the baffle to move upward, causing the baffle perforation to be misaligned with the auxiliary oil passage, thus isolating the faulty oil chamber from the auxiliary oil passage. At the same time, the hydraulic valve is activated to create a backup oil passage, allowing the oil in the auxiliary oil passage to bypass the faulty oil chamber. This structure ensures that a single oil chamber failure is limited to itself and will not spread to the entire auxiliary oil passage, nor will it cause the integrated hydraulic cylinder to shut down as a whole. This greatly improves the operational stability of the device and solves the pain point of chain reaction caused by a series branch failure.

[0025] Secondly, this device solves the problem of high pressure in a faulty branch being transmitted in reverse through the oil circuit, causing overload damage to the normal oil cylinder. After the partition isolates the faulty oil chamber, the abnormal high pressure in the faulty oil chamber is confined within the isolation space and cannot be transmitted to the main oil circuit through the auxiliary oil passage. At the same time, the backup oil circuit only circulates normal oil and will not carry faulty high pressure. In addition, independent pressure monitoring of each oil chamber ensures that abnormal pressure can be captured in real time, avoiding high pressure accumulation. This design cuts off the high pressure transmission path from the source, protects the normal branch oil cylinder from overload, prevents the superposition of new faults such as piston rod deformation and guide sleeve wear, and avoids a chain reaction. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of an embodiment;

[0027] Figure 2 This is a partial half-sectional view of the cylinder block in the embodiment;

[0028] Figure 3 This is a three-dimensional half-sectional view of the auxiliary oil passage in the embodiment;

[0029] Figure 4 yes Figure 3 Enlarged view of the structure at point A in the middle;

[0030] Figure 5 This is a half-sectional view of the planar structure of the auxiliary oil passage in the embodiment;

[0031] Figure 6 yes Figure 5 Enlarged view of the structure at point B in the middle;

[0032] Figure 7 This is a three-dimensional cross-sectional view of the pressure relief plug in the embodiment;

[0033] Figure 8 yes Figure 7 Enlarged view of the structure at point C;

[0034] Figure 9 This is a three-dimensional structural diagram of the pressure relief plug in the embodiment;

[0035] Figure 10 yes Figure 9 Enlarged view of the structure at point D.

[0036] The numbers on the map are:

[0037] 1. Cylinder block; 2. Main oil passage; 3. Secondary oil passage; 4. Oil chamber; 5. Pressure sensor; 6. Piston; 7. Plug; 8. Pressure relief hole; 9. Pressure relief chamber; 10. Pressure relief plug; 11. Fluid transfer chamber; 12. Push rod; 13. Conical head; 14. Liquid-blocking plug; 15. Hydraulic pipe; 16. Baffle plate; 17. Divider; 18. Perforation; 19. Rack; 20. Tension spring; 21. Top plate; 22. Warning light; 23. Hydraulic valve; 24. Valve core; 25. Main gear; 26. Secondary gear; 27. Secondary gear; 28. Main pulley; 29. ​​Secondary pulley; 30. Bevel gear assembly; 31. Screw. Detailed Implementation

[0038] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0039] refer to Figures 1 to 10 An integrated hydraulic cylinder for hot pressing, comprising:

[0040] A cylinder 1 with a main oil passage 2 running through the middle is formed. The main oil passage 2 is formed with several secondary oil passages 3 at equal intervals along the axial direction. Each secondary oil passage 3 is formed with several oil chambers 4 arranged vertically along the axial direction at equal intervals.

[0041] Each oil chamber 4 is provided with a pressure relief plug 10 fixedly connected to the cylinder body 1 at the upper end, a plug head 7 fixedly connected to the lower end of the pressure relief plug 10, a push rod 12 slidably provided in the middle of the pressure relief plug 10, a pressure sensor 5 fixedly connected to the lower end of the push rod 12, and a piston 6 dynamically sealed to the oil chamber 4 below the push rod.

[0042] Each pressure relief plug 10 is provided with an auxiliary circuit mechanism on its side. When the oil chamber 4 fails, the auxiliary circuit mechanism disconnects the oil chamber 5. The auxiliary circuit mechanism includes a hydraulic pipe 15 fixedly connected to the upper end of the cylinder body 1. A partition 17 is formed on the side of the two oil chambers 4 located on the same auxiliary oil passage 3 that are close to each other. The partition 17 is dynamically sealed with a partition plate 16. The output end of the hydraulic pipe 15 is connected to the lower end of the partition 17. A hydraulic valve 23 connecting the two pressure relief plugs 10 is provided above the partition plate 16.

[0043] The upper end of the partition 16 is connected to the push rod 12 via a mechanical structure.

[0044] When this device is running, oil is injected into the main oil passage 2, and then the oil flows into the corresponding auxiliary oil passage 3 along the main oil passage 2. Finally, the oil fills all the oil chambers 4, completing the oil supply work of the integrated cylinder. The number of oil chambers 4 in the integrated cylinder body 1 can be defined according to different needs. Each oil chamber 4, together with the piston 6, pressure relief plug 10 and plug head 7, is an independent unit. The oil passages of the auxiliary oil passage 3 and the oil chambers 4 inside the cylinder body 1 are connected. Only one main oil passage 2 serves as the oil inlet. The oil inlet pressure can reach 90MPa. At the same time, since each oil chamber 4 has the same cylinder diameter and the input pressure is constant, the output force of each oil chamber 4 can be consistent.

[0045] When the integrated hydraulic cylinder is running, although the multiple oil chambers 4 directly connected to the main oil passage 2 are in parallel, the oil will preferentially flow to the oil chamber 4 with lower resistance in the parallel oil circuit. However, since all oil chambers 4 have the same cylinder diameter and constant input pressure, the output force of each oil chamber 4 is naturally consistent. Even if the resistance of a certain oil chamber 4 changes due to a fault, the high-pressure oil source of the main oil passage 2 can still maintain the overall pressure balance through its own flow regulation capability, without the need for an additional pressure relief mechanism. Therefore, the multiple oil chambers 4 directly connected to the main oil passage 2 do not need to be equipped with an additional pressure relief mechanism. Conversely, the multiple oil chambers 4 on the same auxiliary oil passage 3 are in series. If the pressure of a certain oil chamber 4 suddenly rises or falls due to a fault, it will immediately affect the pressure distribution of the oil chambers 4 upstream and downstream of that oil chamber 4, and may even cause the entire auxiliary oil passage 3 to fail. To prevent abnormal pressure in one oil chamber 4 from affecting the other oil chambers 4 connected in series, when the pressure in one oil chamber 4 deviates from the normal value, the pressure sensor 5 detects this abnormal value and transmits the data to the controller. The controller then activates the two hydraulic pipes 15 on both sides of the pressure relief plug 10 above the oil chamber 4. The hydraulic pipes 15 inject oil from bottom to top into the corresponding compartment 17. The oil in the compartment 17 lifts the partition 16 upwards, causing it to move. After the partition 16 moves upwards, it first disconnects the abnormal oil chamber 4 from the auxiliary oil passage 3, and then activates the hydraulic valves 23 on both sides of the pressure relief plug 10 at the top of the abnormal oil chamber 4. At this time, the abnormal oil chamber 4 is isolated, and the oil in the auxiliary oil passage 3 temporarily flows through the plug 7 and pressure relief plug 10 at the abnormal oil chamber 4, thus preventing the entire auxiliary oil passage from malfunctioning due to the abnormality of the oil chamber 4.

[0046] like Figure 6 As shown, Figure 6 The abnormal oil chamber 4 is labeled Y, while the normal oil chambers 4 are labeled X and Z. At this time, the baffles 16 on both sides of Y block the passages between X and Y, and between Y and Z. The flow direction of the oil is referenced... Figure 6 The direction indicated by the bold black arrow.

[0047] The oil flow path through plug 7 and pressure relief plug 10 is a backup oil path, which cannot maintain the operation of the integrated oil cylinder for a long time. Therefore, after the oil chamber 4 is abnormal, the operator should stop the machine in time to repair the abnormal oil chamber 4 to prevent the fault from further expanding its impact.

[0048] To facilitate the transfer of oil in oil chamber 4 to pressure relief plug 10 in the event of abnormal pressure in oil chamber 4, the following features are specifically provided:

[0049] The lower part of the push rod 12 is formed with liquid-blocking plugs 14 arranged at equal angles along the circumference. The lower end of the plug 7 is formed with a pressure relief hole 8 that corresponds to and matches the liquid-blocking plug 14. When the pressure in the oil chamber 4 is within the normal range, the liquid-blocking plug 14 and the pressure relief hole 8 are connected. When the pressure in the oil chamber 4 is abnormal, the liquid-blocking plug 14 is separated from the pressure relief hole 8, and the pressure relief hole 8 is connected to the oil chamber 4.

[0050] The pressure relief chamber 9 is formed inside the stopper 7, and the liquid transfer chamber 11 is formed inside the pressure relief plug 10. The pressure relief chamber 9 and the liquid transfer chamber 11 are connected.

[0051] During normal operation of the oil chamber 4, the liquid-blocking plug 14 at the lower part of the push rod 12 precisely engages with the pressure relief hole 8 at the lower end of the plug head 7, completely sealing the pressure relief hole 8. This prevents the oil in the oil chamber 4 from flowing into the pressure relief chamber 9 without permission, ensuring that all the oil is used to push the piston 6 to achieve cylinder output. When the pressure sensor 5 detects an abnormal pressure in the oil chamber 4, the displacement of the baffle 16 will drive the push rod 12 to move, causing the liquid-blocking plug 14 to completely separate from the pressure relief hole 8. At this time, the high-pressure oil inside the oil chamber 4 can quickly enter the pressure relief chamber 9 inside the plug head 7 through the pressure relief hole 8, and then flow smoothly from the pressure relief chamber 9 into the liquid transfer chamber 11 inside the pressure relief plug 10, providing a temporary buffer storage space for the oil and preventing the oil from continuously accumulating in the oil chamber 4, which would cause the pressure to rise further.

[0052] To reduce the resistance when the push rod 12 moves downward, the following features are specifically designed:

[0053] like Figure 4 As shown, the lower end of the push rod 12 is formed with a tapered head 13.

[0054] When the push rod 12 needs to move downwards due to abnormal pressure, its lower end tapered head 13 can first contact the oil inside the oil chamber 4. Compared with the flat end structure, the tapered head 13 can reduce the contact area between the push rod 12 and the oil during the movement, and reduce the resistance of the oil to the push rod 12. At the same time, the tapered head 13 can also play a certain guiding role, ensuring that the push rod 12 always moves along the axis of the oil chamber 4 during the movement, avoiding structural jamming due to deviation, and ensuring the smooth execution of the pressure relief action.

[0055] To ensure that when oil chamber 4 is operating normally, the oil in two adjacent oil chambers 4 can flow between the two oil chambers 4, and that when oil chamber 4 is not operating normally, the problematic oil chamber 4 can be temporarily isolated, the following features are specifically designed:

[0056] like Figure 4 and Figure 9 As shown, a perforation 18 is formed in the middle of the partition 16. When the pressure in the oil chamber 4 is within the normal range, the perforation 18 is coaxially aligned with the auxiliary oil passage 3. During normal operation of the integrated cylinder, the perforation 18 in the middle of the partition 16 remains coaxial with the auxiliary oil passage 3. At this time, the oil in the auxiliary oil passage 3 can flow through the perforation 18 without obstruction to each oil chamber 4, ensuring that all oil chambers 4 on the same auxiliary oil passage 3 can obtain a stable oil supply and achieve synchronous output. When an abnormal pressure occurs in a certain oil chamber 4, the partition 16 moves upward under the oil supply of the hydraulic pipe 15. The perforation 18 will move synchronously with the partition 16 and be misaligned with the axis of the auxiliary oil passage 3, completely cutting off the oil connection between the faulty oil chamber 4 and the auxiliary oil passage 3, so that the faulty oil chamber 4 is isolated from the main oil circuit and the fault is prevented from spreading to other oil chambers 4.

[0057] To facilitate the movement of the partition 16, which can drive the liquid valve 23 and the push rod 12 to move, the following features are specifically provided:

[0058] like Figure 6 and Figure 10 As shown, two racks 19 are fixedly connected to the two sides of the upper part of the partition 16.

[0059] As the partition 16 moves up and down along the cavity 17, the racks 19 fixed to its upper sides move synchronously with the partition 16. The racks 19 provide the basic structure for the subsequent transmission connection with the hydraulic valve 23 and the push rod 12. When the partition 16 moves upward abnormally due to the oil cavity 4, the racks 19 can transmit the linear motion of the partition 16 to the valve core 24 of the hydraulic valve 23 and the transmission structure of the push rod 12 through meshing with the subsequent gear components. This ensures that the opening of the hydraulic valve 23, the action of the push rod 12, and the isolation action of the partition 16 are synchronized, achieving linkage in fault handling.

[0060] In order to enable the liquid valve 23 to open and connect the two corresponding pressure relief plugs 10 when the partition 16 moves upward, the following features are also provided:

[0061] like Figure 6 and Figure 10 As shown, a valve core 24 is rotatably connected to the middle of the liquid valve 23. Two main gears 25 are fixed to both ends of the valve core 24, and the two main gears 25 mesh with the two main racks 19 respectively.

[0062] When abnormal pressure in oil chamber 4 causes baffle 16 to move upward, rack 19 on baffle 16 will move upward synchronously. Since rack 19 meshes with the main gears 25 at both ends of valve core 24 of liquid valve 23, the linear motion of rack 19 can drive the main gears 25 to rotate around the axis of valve core 24, thereby driving valve core 24 to rotate synchronously. When valve core 24 rotates to a horizontal position (see reference here)... Figure 6 The internal flow channel of the hydraulic valve 23 is completely opened, realizing the oil connection between the two corresponding pressure relief plugs 10, providing a channel for the transfer of oil in the faulty oil chamber 4 and the conduction of the backup oil circuit.

[0063] To increase the torque and prevent the rack 19 from being insufficient to move the push rod 12, the following features are specifically designed:

[0064] The upper end of the pressure relief plug 10 is fixedly connected to two wheel seats. The two wheel seats are rotatably connected to the opposite side of each other. When the rack 19 moves upward, it will drive the auxiliary gear 26 to rotate.

[0065] like Figure 10 As shown, a secondary gear 27 is provided on the side of the secondary gear 26 and is rotatably connected to the wheel seat. The radius of the secondary gear 27 is much smaller than the radius of the secondary gear 26. The secondary gear 26 and the secondary gear 27 mesh with each other. The secondary gear 27 is coaxially fixed to the main pulley 28. An auxiliary pulley 29 is rotatably arranged above the pressure relief plug 10. The auxiliary pulley 29 and the main pulley 28 are connected by belt drive.

[0066] When the partition 16 moves the rack 19 upward, the rack 19 meshes with the secondary gear 26 on the wheel seat, driving the secondary gear 26 to rotate around its own axis. Since the secondary gear 26 meshes with the smaller secondary gear 27, according to the gear transmission principle, the rotation of the secondary gear 26 can drive the secondary gear 27 to rotate at a higher speed, thereby increasing the torque. The secondary gear 27 is coaxially fixed to the main pulley 28, which can drive the main pulley 28 to rotate synchronously, and transmit the power to the secondary pulley 29 through the belt, ensuring that even when the displacement of the rack 19 is small, the power can be amplified through this transmission structure to provide sufficient torque for the displacement of the push rod 12.

[0067] To facilitate stable displacement of the push rod 12, the following features are specifically designed:

[0068] like Figure 9 As shown, the upper end of the pressure relief plug 10 is provided with a bevel gear assembly 30. One end of the bevel gear assembly 30 is coaxially fixed to the auxiliary pulley 29, and the other end is fixed to a screw 31. The screw 31 is threadedly connected to the push rod 12.

[0069] When the auxiliary pulley 29 receives power from the belt and rotates, it drives one end of the bevel gear assembly 30, which is coaxially fixed to it, to rotate. The bevel gear assembly 30 changes the direction of power transmission through gear meshing, transmitting the rotational power to the screw 31 fixed to the other end. Since the screw 31 and the push rod 12 are connected by a thread, the rotational motion of the screw 31 can be converted into the linear motion of the push rod 12. Moreover, the threaded connection structure can effectively limit the radial wobble of the push rod 12, so that the push rod 12 remains stable during displacement, avoiding the impact of deviation on the fitting accuracy between the liquid-blocking plug 14 and the pressure relief hole 8.

[0070] To facilitate the automatic reset of the partition 16 in the future, the following features are also provided:

[0071] like Figure 8 As shown, two top plates 21 are fixedly connected to the upper end of the partition 16. Each top plate 21 has a tension spring 20 near the cylinder body 1. One end of the tension spring 20 is fixedly connected to the top plate 21, and the other end is fixedly connected to the cylinder body 1. When the oil chamber 4 is not malfunctioning, the tension spring 20 is in a naturally stretched state, exerting a slight tension on the top plate 21 to ensure that the partition 16 maintains a stable position when the hydraulic pipe 15 is not supplying oil, and that the perforation 18 is precisely coaxial with the auxiliary oil passage 3. When the oil chamber 4 malfunctions, the hydraulic pipe 15 supplies oil, pushing the partition 16 upward. The top plate 21 rises synchronously with the partition 16, and the tension spring 20 is further stretched and stores elastic potential energy. After the faulty oil chamber 4 is repaired, the hydraulic pipe 15 stops supplying oil, the tension spring 20 releases its elastic potential energy, pulling the top plate 21 downward, thereby causing the partition 16 to automatically reset to its initial position, making the perforation 18 coaxial with the auxiliary oil passage 3 again. Normal oil flow can be restored without manual adjustment.

[0072] To facilitate operators in quickly identifying the malfunctioning oil chamber 4, the following features are specifically designed:

[0073] like Figure 4 As shown, the upper end of the pressure relief plug 10 is equipped with a warning light 22, which is electrically connected to the pressure sensor 5.

[0074] When pressure sensor 5 does not detect any abnormality, warning light 22 remains off, indicating that all oil chambers 4 are operating normally. When pressure sensor 5 detects that the pressure in any oil chamber 4 exceeds the normal range or falls below the threshold, pressure sensor 5 immediately sends an electrical signal to warning light 22, triggering it to illuminate. Operators can quickly locate the faulty oil chamber 4 by observing the position of warning light 22, eliminating the need to check the pressure data of each oil chamber 4 individually, significantly reducing fault location time.

[0075] The detailed working principle of this device is as follows: During normal operation, the high-pressure oil injected into the main oil passage 2 is radially distributed to each of the auxiliary oil passages 3. The oil in the auxiliary oil passages 3 flows sequentially through the perforation 18 in the middle of the partition 16 and the series-connected oil chambers 4. At this time, the liquid-blocking plug 14 at the lower part of the push rod 12 in each oil chamber 4 is tightly fitted with the pressure relief hole 8 of the plug 7, completely sealing the pressure relief channel. All the oil acts on the piston 6. With the same cylinder diameter and constant pressure, the output force of all oil chambers 4 is consistent. The partition 16 is in its initial position under the slight tension of the tension spring 20, and the perforation 18 is precisely aligned with the axis of the auxiliary oil passage 3, ensuring unobstructed flow of oil. The valve core 24 of the liquid valve 23 is in the closed state, and adjacent pressure relief plugs 10 are not interconnected. The warning light 22 remains off because the pressure sensor 5 does not detect any abnormality, and the entire system is in a stable output state.

[0076] When an abnormal pressure (too high or too low) occurs in a certain oil chamber 4 (such as chamber Y), the pressure sensor 5 instantly captures the abnormal signal and transmits it to the controller. The controller immediately activates the hydraulic pipes 15 on both sides of chamber Y, and high-pressure oil is injected from the lower end of the partition 17, pushing the partition 16 upward to move against the tension of the tension spring 20. During the upward movement of the partition 16, the racks 19 on both sides rise synchronously and mesh with the main gears 25 at both ends of the valve core 24 of the hydraulic valve 23, driving the valve core 24 to rotate to a horizontal state, so that the pressure relief plugs 10 on the left and right sides of chamber Y (i.e., the pressure relief plugs 10 connected to chambers X and Z) are connected through the hydraulic valve 23; at the same time, the racks 19 mesh with the secondary gear 26 on the wheel seat, driving the secondary gear 26 to rotate, and the torque is amplified by meshing with the small radius secondary gear 27. The secondary gear 27 drives the main pulley 28 to rotate, which is transmitted to the secondary pulley 29 via belt transmission, and then the transmission direction is changed by the bevel gear group 30, driving the screw 31 to rotate. The threaded connection between screw 31 and push rod 12 converts rotational motion into linear motion. Push rod 12 in X and Z cavities adjacent to Y cavity moves steadily downward, separating the liquid-blocking plug 14 from the pressure relief hole 8. The oil inside X and Z cavities enters the pressure relief chamber 9 of the corresponding plug 7 through the pressure relief hole 8, and then through the liquid transfer chamber 11 of the corresponding pressure relief plug 10, completing the connection with the plug 7 and pressure relief plug 10 of Y cavity. At this time, the perforation 18 of partition 16 is misaligned with the axis of auxiliary oil passage 3, completely cutting off the connection between Y cavity and auxiliary oil passage 3. The oil flows through the backup oil passage formed by plug 7 and pressure relief plug 10 in Y cavity. At the same time, the warning light 22 corresponding to Y cavity lights up to indicate the location of the fault to the operator.

[0077] Since the backup oil circuit is only connected through the pressure relief chamber 9, the transfer chamber 11, and the liquid valve 23, the flow cross-section is small and cannot meet the high flow rate oil demand of hot pressing for a long time. Therefore, the operator must stop the machine in time after the warning light 22 is lit and locate the faulty oil chamber 4 according to the position of the warning light 22 to perform operations such as seal replacement and component repair. After the repair is completed, the controller controls the hydraulic pipe 15 to stop the oil supply, the tension spring 20 connected to the top plate 21 at the upper end of the partition 16 releases its elastic potential energy, pulls the partition 16 downward to reset, the perforation 18 is re-aligned with the auxiliary oil passage 3, the liquid blocking plug 14 re-seals the pressure relief hole 8 under the reset action of the push rod 12, and the liquid valve 23 is closed under the reset action of the rack 19. The device returns to normal operation and ensures the stable operation of subsequent hot pressing.

[0078] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. An integrated hydraulic cylinder for hot pressing, characterized in that, include: A cylinder body (1) with a main oil passage (2) running through the middle is formed. The main oil passage (2) is formed with secondary oil passages (3) running through it at equal intervals. Each secondary oil passage (3) is formed with an oil cavity (4) running through it at equal intervals. Each oil chamber (4) has a pressure relief plug (10) fixedly connected to the cylinder body (1) at the upper end, a plug head (7) fixedly connected to the lower end of the pressure relief plug (10), a push rod (12) slidably provided in the middle of the pressure relief plug (10), a pressure sensor (5) fixedly connected to the lower end of the push rod (12), and a piston (6) dynamically sealed and connected to the oil chamber (4) below the push rod (12). Each pressure relief plug (10) is provided with an auxiliary circuit mechanism on the side. The auxiliary circuit mechanism includes a hydraulic pipe (15) fixedly connected to the upper end of the cylinder body (1). A partition (17) is formed on the side of the two oil chambers (4) located in the same auxiliary oil passage (3) that are close to each other. A partition (16) is provided in the partition (17). The output end of the hydraulic pipe (15) is connected to the lower end of the partition (17). A hydraulic valve (23) connecting the two pressure relief plugs (10) is provided above the partition (16). The upper end of the partition (16) is connected to the push rod (12) for transmission.

2. An integrated hydraulic cylinder for hot pressing as described in claim 1, characterized in that, The lower part of the push rod (12) is formed with liquid-blocking plugs (14) arranged at equal angles along the circumference. The lower end of the plug (7) is formed with a pressure relief hole (8) that corresponds to and matches the liquid-blocking plug (14). When the pressure in the oil cavity (4) is within the normal range, the liquid-blocking plug (14) and the pressure relief hole (8) are connected. When the pressure in the oil cavity (4) is abnormal, the liquid-blocking plug (14) is separated from the pressure relief hole (8), and the pressure relief hole (8) is connected to the oil cavity (4). The plug (7) has a pressure relief chamber (9) inside, and the pressure relief plug (10) has a liquid transfer chamber (11) inside. The pressure relief chamber (9) and the liquid transfer chamber (11) are connected.

3. An integrated hydraulic cylinder for hot pressing as described in claim 2, characterized in that, The lower end of the push rod (12) is formed with a tapered head (13).

4. An integrated hydraulic cylinder for hot pressing as described in claim 1, characterized in that, The partition (16) has a perforation (18) formed in the middle. When the pressure in the oil cavity (4) is within the normal range, the perforation (18) is set on the same axis as the auxiliary oil passage (3).

5. An integrated hydraulic cylinder for hot pressing as described in claim 4, characterized in that, Two toothed racks (19) are fixedly connected to the upper two sides of the partition (16).

6. An integrated hydraulic cylinder for hot pressing as described in claim 5, characterized in that, A valve core (24) is rotatably connected to the middle of the liquid valve (23). The two ends of the valve core (24) are respectively fixed with main gears (25), and the two main gears (25) mesh with the two main racks (19).

7. An integrated hydraulic cylinder for hot pressing as described in claim 5, characterized in that, The upper end of the pressure relief plug (10) is fixedly connected to two wheel seats. The two wheel seats are rotatably connected to the opposite side of each other. The rack (19) moves upward and drives the auxiliary gear (26) to rotate. A secondary gear (27) is provided on the side of the secondary gear (26) and is rotatably connected to the wheel seat. The radius of the secondary gear (27) is much smaller than that of the secondary gear (26). The secondary gear (26) meshes with the secondary gear (27). The secondary gear (27) is coaxially fixed to the main pulley (28). A secondary pulley (29) is rotatably provided above the pressure relief plug (10). The secondary pulley (29) is connected to the main pulley (28) by belt drive.

8. An integrated hydraulic cylinder for hot pressing as described in claim 7, characterized in that, The pressure relief plug (10) has a bevel gear assembly (30) at its upper end. One end of the bevel gear assembly (30) is coaxially fixed to the auxiliary pulley (29), and the other end is fixed to a screw (31). The screw (31) is threadedly connected to the push rod (12).

9. An integrated hydraulic cylinder for hot pressing as described in claim 5, characterized in that, Two top plates (21) are fixedly connected to the upper end of the partition (16). Each of the two top plates (21) is provided with a tension spring (20) at the end near the cylinder (1). One end of the tension spring (20) is fixedly connected to the top plate (21), and the other end is fixedly connected to the cylinder (1).

10. An integrated hydraulic cylinder for hot pressing as described in claim 1, characterized in that, The upper end of the pressure relief plug (10) is equipped with a warning light (22), which is electrically connected to the pressure sensor (5).

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