Potential energy recovery hydraulic system for a forging press

Abstract

The application discloses a kind of forging equipment potential energy recovery hydraulic systems, it is related to hydraulic system technical field, including hydraulic cylinder, first electromagnetic reversing valve, second electromagnetic reversing valve, first check valve, second check valve, first cartridge valve, second cartridge valve, third cartridge valve, safety valve, overflow valve, hydraulic valve and energy accumulator;The up and down action of hydraulic cylinder is realized by the reversing of first electromagnetic reversing valve;By first cartridge valve, second cartridge valve, third cartridge valve, second electromagnetic reversing valve, overflow valve, hydraulic valve, second check valve and energy accumulator combination, energy conversion is realized during the gravity downlink process of active device potential energy into hydraulic energy to store;Safety pressure is set by safety valve, to avoid causing equipment damage, thereby solve the problem of large press equipment hydraulic system, installed power is big, hydraulic system temperature rises fast, loading speed is slow, energy consumption is big, fault rate is high, production efficiency is low, improve equipment operating efficiency, save energy consumption.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system technology, and in particular to a hydraulic system for recovering potential energy in forging equipment. Background Technology

[0002] With the rapid development of hydraulic equipment in China, the hydraulic control systems of large hydraulic presses, large lifting platforms, and heavy-duty loaders still rely on traditional control concepts. Movable devices weighing tens to hundreds of tons are lifted into position using hydraulic cylinders, and the hydraulic fluid is discharged into the tank during descent, resulting in significant energy waste and rapid temperature rise in the hydraulic system. To collect and reuse the energy generated by the gravity fall of movable devices, an energy-saving hydraulic control system is urgently needed, requiring the development of an automatic energy regeneration hydraulic control system. This is especially crucial for large hydraulic presses, which require low installed power, low hydraulic system temperature rise, and high loading speeds; these requirements must be met through an energy-saving hydraulic control system.

[0003] With its core function being an automatic energy regeneration hydraulic control system, this control method has consistently held a leading position. It fully utilizes the energy generated by the downward force of the moving parts, converting it into hydraulic energy for storage and regeneration, thus solving the technical challenges of energy conservation, emission reduction, and improved work efficiency in hydraulic equipment. This control system boasts advantages such as high oil flow capacity, strong anti-pollution properties, and high integration. Previously, large hydraulic presses often suffered from problems such as high installed power, rapid temperature rise, and slow loading speed. Addressing these issues was a pressing technical challenge for the industry. Therefore, the use of the automatic energy regeneration hydraulic control system significantly improves the overall performance of large hydraulic presses by reducing energy consumption, emissions, and increasing loading speed. Currently, large hydraulic presses in actual use often lack automatic energy regeneration control, resulting in high installed power, rapid temperature rise, slow loading speed, high energy consumption, high failure rates, and low production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic system for recovering potential energy in forging equipment, which can convert the potential energy generated by the gravity falling of the moving device into hydraulic energy for storage. This solves the problems of large installed power, rapid temperature rise, slow loading speed, high energy consumption, high failure rate and low production efficiency in the hydraulic system of large press equipment, thereby improving equipment operating efficiency and saving energy.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a hydraulic system for recovering potential energy in forging equipment, including a hydraulic cylinder, a first electromagnetic directional valve, a second electromagnetic directional valve, a first check valve, a second check valve, a first cartridge valve, a second cartridge valve, a third cartridge valve, a safety valve, a relief valve, a hydraulic valve, and an accumulator.

[0007] The oil pump outlet is connected to the P port of the first solenoid directional valve and the B port of the first cartridge valve, respectively; the B port of the first solenoid directional valve is connected to the cylinder piston chamber of the hydraulic cylinder and the B port of the first check valve, respectively; the A port of the first solenoid directional valve is connected to the cylinder rod chamber of the hydraulic cylinder, the B port of the third cartridge valve, the P port of the safety valve, and the P port of the second solenoid directional valve, respectively; the A port of the third cartridge valve is connected to the A port of the second cartridge valve and the A port of the second check valve, respectively; the A port of the second solenoid directional valve is connected to the third... The C port of the cartridge valve; the C port of the second cartridge valve is connected to the P port of the relief valve and the P port of the hydraulic valve respectively; the A port of the hydraulic valve is connected to the T port of the relief valve and the C port of the first cartridge valve respectively; the A port of the first cartridge valve is connected to the accumulator, the X port of the hydraulic valve and the B port of the second check valve respectively; the T port of the first solenoid directional valve, the A port of the first check valve, the B port of the second cartridge valve, the T port of the hydraulic valve, the T port of the second solenoid directional valve and the T port of the safety valve are all connected to the oil tank port;

[0008] When the first electromagnetic directional valve is in the neutral position, its P port, T port, A port and B port are all closed. When the first electromagnetic directional valve is in the first working position, its P port is connected to its A port and its T port is connected to its B port. When the first electromagnetic directional valve is in the second working position, its P port is connected to its B port and its T port and A port are all closed.

[0009] The B port of the second electromagnetic directional valve is a closed port. When the second electromagnetic directional valve is in the off position, its P port is connected to its A port and its T port is connected to its B port. When the second electromagnetic directional valve is in the on position, its A port is connected to its T port and its P port is connected to its B port.

[0010] The B port of the hydraulic valve is a closed port. When the hydraulic valve is in its original functional position, its P port is connected to its A port and its T port is connected to its B port. When the storage pressure of the accumulator reaches the set pressure of the hydraulic valve, the oil pushes the hydraulic valve to switch to the switching functional position through the X port of the hydraulic valve. When the hydraulic valve is in the switching functional position, its P port is connected to its B port and its A port is connected to its T port.

[0011] The present invention achieves the following technical effects compared to the prior art:

[0012] The forging press equipment potential energy recovery hydraulic system provided by this invention achieves the up-and-down movement of the hydraulic cylinder through the switching of the first electromagnetic directional valve. When the hydraulic cylinder is rapidly pulled downward by the gravity of the movable device, the first check valve replenishes the hydraulic oil, filling the cylinder piston cavity with hydraulic oil. Through the combination of the first cartridge valve, second cartridge valve, third cartridge valve, second electromagnetic directional valve, relief valve, hydraulic valve, second check valve, and accumulator, the potential energy of the movable device during its downward movement under gravity is converted into hydraulic energy and stored. A safety valve sets a safety pressure to prevent high pressure from being generated in the cylinder rod cavity, thus avoiding equipment damage. Therefore, this invention achieves control of the hydraulic system in large hydraulic press equipment. It has a simple structure, clear principle, high reliability, and is easy to debug. In case of malfunction, it is easy to troubleshoot and resolve problems. Furthermore, the manufacturing cost of this invention is relatively low, making it readily applicable to other similar hydraulic equipment. With minimal cost increase, it solves the problems of high installed power, rapid temperature rise, slow loading speed, high energy consumption, high failure rate, and low production efficiency in the hydraulic system of large press equipment, thereby improving equipment operating efficiency and saving energy. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the hydraulic system for potential energy recovery in forging equipment provided by the present invention.

[0015] In the diagram: 1-First check valve, 2-First solenoid directional valve, 3-First cartridge valve, 4-Accumulator, 5-Hydraulic valve, 6-Second cartridge valve, 7-Hydraulic cylinder, 8-Relief valve, 9-Second check valve, 10-Third cartridge valve, 11-Second solenoid directional valve, 12-Safety valve. Detailed Implementation

[0016] 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.

[0017] The purpose of this invention is to provide a hydraulic system for recovering potential energy in forging equipment, which solves the problems existing in the prior art. It can convert the potential energy generated by the gravity falling of the moving device into hydraulic energy for storage, and solves the problems of large press equipment hydraulic systems such as large installed power, rapid temperature rise of hydraulic system, slow loading speed, high energy consumption, high failure rate and low production efficiency, thereby improving equipment operating efficiency and saving energy.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1 As shown, this embodiment provides a hydraulic system for recovering potential energy in a forging press, including a hydraulic cylinder 7, a first electromagnetic directional valve 2, a second electromagnetic directional valve 11, a first check valve 1, a second check valve 9, a first cartridge valve 3, a second cartridge valve 6, a third cartridge valve 10, a safety valve 12, a relief valve 8, a hydraulic valve 5, and an accumulator 4.

[0020] The oil pump outlet is connected to the P port of the first solenoid directional valve 2 and the B port of the first cartridge valve 3, respectively; the B port of the first solenoid directional valve 2 is connected to the cylinder piston chamber of the hydraulic cylinder 7 and the B port of the first check valve 1, respectively; the A port of the first solenoid directional valve 2 is connected to the cylinder rod chamber of the hydraulic cylinder 7, the B port of the third cartridge valve 10, the P port of the safety valve 12, and the P port of the second solenoid directional valve 11, respectively; the A port of the third cartridge valve 10 is connected to the A port of the second cartridge valve 6 and the A port of the second check valve 9, respectively; the A port of the second solenoid directional valve 11 is connected to the first... The C port of the three-cartridge valve 10; the C port of the second cartridge valve 6 is connected to the P port of the relief valve 8 and the P port of the hydraulic valve 5 respectively; the A port of the hydraulic valve 5 is connected to the T port of the relief valve 8 and the C port of the first cartridge valve 3 respectively; the A port of the first cartridge valve 3 is connected to the accumulator 4, the X port of the hydraulic valve 5 and the B port of the second check valve 9 respectively; the T port of the first solenoid directional valve 2, the A port of the first check valve 1, the B port of the second cartridge valve 6, the T port of the hydraulic valve 5, the T port of the second solenoid directional valve 11 and the T port of the safety valve 12 are all connected to the oil tank port.

[0021] When the first solenoid directional valve 2 is in the neutral position, its P port, T port, A port and B port are all closed. When the first solenoid directional valve 2 is in the first working position, its P port is connected to its A port and its T port is connected to its B port. When the first solenoid directional valve 2 is in the second working position, its P port is connected to its B port and its T port and A port are all closed.

[0022] The B port of the second electromagnetic directional valve 11 is a closed port. When the second electromagnetic directional valve 11 is in the off position, its P port is connected to its A port and its T port is connected to its B port. When the second electromagnetic directional valve 11 is in the on position, its A port is connected to its T port and its P port is connected to its B port.

[0023] The B port of the hydraulic valve 5 is a closed port. When the hydraulic valve 5 is in its original functional position, its P port is connected to the A port and its T port is connected to the B port. When the storage pressure of the accumulator 4 reaches the set pressure of the hydraulic valve 5, the oil pushes the hydraulic valve 5 to switch through the X port of the hydraulic valve 5 to reach the switching functional position. When the hydraulic valve 5 is in the switching functional position, its P port is connected to the B port and its A port is connected to the T port.

[0024] The working principle is as follows: The oil pump outlet is connected to the P port of the first solenoid directional valve 2 and the B port of the first cartridge valve 3. At this time, the first solenoid directional valve 2 is in the neutral position, and ports A, B, P and T are closed. The valve core of the first cartridge valve 3 is in the closed state, so the oil connected to the oil pump outlet is sealed inside.

[0025] When the hydraulic cylinder 7 is raised, the first solenoid directional valve 2 operates in its right position (i.e., the first solenoid directional valve 2 is in its first working position). Oil from the pump outlet enters the P port of the first solenoid directional valve 2, and then flows through the first solenoid directional valve 2 from port A to the cylinder rod chamber of the hydraulic cylinder 7, the P port of the safety valve 12, the P port of the second solenoid directional valve 11, and the B port of the third cartridge valve 10. The safety valve 12 is set to a protective pressure and will not be opened; no oil will flow out of its T port. The second solenoid directional valve 11 is in the off-position, and its P port connects through the second solenoid directional valve 11 from port A to the C port of the third cartridge valve 10, sealing the third cartridge valve 10 from opening. The cylinder plug chamber of the hydraulic cylinder 7 connects to the B port of the first solenoid directional valve 2 and the B port of the first check valve 1, and flows back to the oil tank through the first solenoid directional valve 2 from port T. Thus, the pressure oil in the cylinder rod chamber of the hydraulic cylinder 7 pushes the hydraulic cylinder 7 to rise rapidly.

[0026] When the hydraulic cylinder 7 descends, the first solenoid directional valve 2 operates in its left-hand position (i.e., the first solenoid directional valve 2 is in its second working position). Oil from the pump outlet enters the P port of the first solenoid directional valve 2, and then flows through the first solenoid directional valve 2 from its B port to the cylinder piston chamber of the hydraulic cylinder 7 and the B port of the first check valve 1. The B port of the first check valve 1 cannot flow to the A port; it is one-way closed. The cylinder rod chamber of the hydraulic cylinder 7 is connected to the P port of the second solenoid directional valve 11, the B port of the third cartridge valve 10, the P port of the safety valve 12, and the A port of the first solenoid directional valve 2. When the first solenoid directional valve 2 is in its left-hand position, it is closed, and oil cannot flow. The safety valve 12 is set to a protective pressure; therefore, the safety valve 12 will not be opened, and no oil will flow out of the T port of the safety valve 12. The second solenoid directional valve 11 enters the powered position, so that port C of the third cartridge valve 10 is connected to port A of the second solenoid directional valve 11. The fluid then flows back to the oil tank from port T via the second solenoid directional valve 11. At this time, the third cartridge valve 10 is opened by the high-pressure oil in the cylinder rod chamber of the hydraulic cylinder 7. Port A of the third cartridge valve 10 is connected to port A of the second check valve 9 and port A of the second cartridge valve 6. The second check valve 9 is opened by pressurized oil, connecting port B to the accumulator 4, port X of the hydraulic valve 5, and port A of the first cartridge valve 3. Port C of the second cartridge valve 6 is connected to port P of the relief valve 8 and port P of the hydraulic valve 5. Port T of the relief valve 8 is connected to port A of the hydraulic valve 5. At this time, the hydraulic valve 5 is in its original functional position, with port P connected to port A via the hydraulic valve 5. The relief valve 8 cannot be opened, and port A of the hydraulic valve 5 is connected to port C of the first cartridge valve 3, thus closing the valve core of the first cartridge valve 3. Due to the gravity of the moving device, the hydraulic cylinder 7 can quickly descend by its own weight. In this way, the hydraulic oil in the cylinder rod chamber of the hydraulic cylinder 7 is connected to the accumulator 4 for storage via port B of the second one-way valve 9. When the oil supply to the cylinder plug chamber of the hydraulic cylinder 7 is insufficient, the first one-way valve 1 is opened by negative pressure, and the oil in the oil tank replenishes the cylinder plug chamber of the hydraulic cylinder 7, ensuring that the oil is always in a full state. When the storage pressure of the accumulator 4 reaches the set pressure of the hydraulic valve 5, the hydraulic valve 5 is pushed to switch directions, reaching the switching position function. At this time, the P port and B port of the hydraulic valve 5 are connected, and the A port and T port of the hydraulic valve 5 are connected. The T port of the relief valve 8 is connected to the A port of the hydraulic valve 5 and flows back to the oil tank from the T port through the hydraulic valve 5. In this way, the relief valve 8 is opened, and the second cartridge valve 6 is opened by the back pressure regulated by the relief valve 8. The oil flows back to the oil tank from the B port of the second cartridge valve 6. The oil in the cylinder rod chamber of the hydraulic cylinder 7 no longer flows to the accumulator 4 for energy storage. The C port of the first cartridge valve 3 is connected to the A port of the hydraulic valve 5 and also flows back to the oil tank through the T port. In this way, the valve core of the first cartridge valve 3 is opened by the pressure oil of the accumulator 4 and flows into the P port of the first solenoid directional valve 2. Then, it flows into the cylinder plug chamber of the hydraulic cylinder 7 from the B port through the first solenoid directional valve 2, realizing the regeneration of hydraulic energy and providing loading speed.

[0027] If the pressure in the cylinder rod chamber of hydraulic cylinder 7 exceeds the safety set pressure, the safety valve 12 opens, and the cylinder rod chamber of hydraulic cylinder 7 is connected to the P port of safety valve 12, flowing back to the oil tank through the T port, thereby protecting hydraulic cylinder 7 from high pressure damage.

[0028] This invention features a simple structure and a significant automatic regeneration effect of hydraulic energy. The hydraulic cylinder 7 moves up and down via the switching of the first electromagnetic directional valve. When the hydraulic cylinder 7 is rapidly pulled downwards by the gravity of the movable device, the first check valve 1 replenishes the hydraulic fluid, filling the cylinder chamber of the hydraulic cylinder 7 with hydraulic oil. Through the combination of the first cartridge valve 3, the second cartridge valve 6, the third cartridge valve 10, the second electromagnetic directional valve 11, the relief valve 8, the hydraulic valve 5, the second check valve 9, and the accumulator 4, the potential energy of the movable device during its downward movement under gravity is converted into hydraulic energy for storage. A safety valve 12 sets a safety pressure, preventing high pressure from being generated in the cylinder rod chamber of the hydraulic cylinder 7, thus avoiding equipment damage.

[0029] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A hydraulic system for recovering potential energy in forging equipment, characterized in that: It includes a hydraulic cylinder, a first solenoid directional valve, a second solenoid directional valve, a first check valve, a second check valve, a first cartridge valve, a second cartridge valve, a third cartridge valve, a safety valve, a relief valve, a hydraulic valve, and an accumulator; The oil pump outlet is connected to the P port of the first solenoid directional valve and the B port of the first cartridge valve, respectively; the B port of the first solenoid directional valve is connected to the cylinder piston chamber of the hydraulic cylinder and the B port of the first check valve, respectively; the A port of the first solenoid directional valve is connected to the cylinder rod chamber of the hydraulic cylinder, the B port of the third cartridge valve, the P port of the safety valve, and the P port of the second solenoid directional valve, respectively; the A port of the third cartridge valve is connected to the A port of the second cartridge valve and the A port of the second check valve, respectively; the A port of the second solenoid directional valve is connected to the third... The C port of the cartridge valve; the C port of the second cartridge valve is connected to the P port of the relief valve and the P port of the hydraulic valve respectively; the A port of the hydraulic valve is connected to the T port of the relief valve and the C port of the first cartridge valve respectively; the A port of the first cartridge valve is connected to the accumulator, the X port of the hydraulic valve and the B port of the second check valve respectively; the T port of the first solenoid directional valve, the A port of the first check valve, the B port of the second cartridge valve, the T port of the hydraulic valve, the T port of the second solenoid directional valve and the T port of the safety valve are all connected to the oil tank port; When the first electromagnetic directional valve is in the neutral position, its P port, T port, A port and B port are all closed. When the first electromagnetic directional valve is in the first working position, its P port is connected to its A port and its T port is connected to its B port. When the first electromagnetic directional valve is in the second working position, its P port is connected to its B port and its T port and A port are all closed. The B port of the second electromagnetic directional valve is a closed port. When the second electromagnetic directional valve is in the off position, its P port is connected to its A port and its T port is connected to its B port. When the second electromagnetic directional valve is in the on position, its A port is connected to its T port and its P port is connected to its B port. The B port of the hydraulic valve is a closed port. When the hydraulic valve is in its original functional position, its P port is connected to its A port and its T port is connected to its B port. When the storage pressure of the accumulator reaches the set pressure of the hydraulic valve, the oil pushes the hydraulic valve to switch to the switching functional position through the X port of the hydraulic valve. When the hydraulic valve is in the switching functional position, its P port is connected to its B port and its A port is connected to its T port.

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