Energy-saving and efficient hydraulic system of anchor rod disc press

Abstract

The invention discloses an energy-saving and efficient anchor rod disc press hydraulic system which comprises a main oil tank containing hydraulic oil and further comprises a filter, a hydraulic pump, a main overflow valve, a main valve and a stamping oil cylinder. The hydraulic system further comprises a sequence valve and a standby system. The oil outlet of the hydraulic pump is also connected with the main valve through the sequence valve; and the oil outlet of the hydraulic pump is also connected with the standby system. The system further comprises a pressurizing system and a liquid filling system. Emergency control is provided through the standby system when a fault occurs, the reliability is high, the energy utilization efficiency is improved through the energy storage device, and meanwhile the advantages of being high in adaptability, small in impact and the like are achieved.

Description

Technical Field

[0001] The invention relates to a hydraulic system, in particular to an anchor plate press hydraulic system. Background Art

[0002] The hydraulic system of a traditional anchor plate press usually consists of a hydraulic pump, a reversing valve and a stamping cylinder. When working, the hydraulic pump draws hydraulic oil from the oil tank, controls the flow of oil through the reversing valve, drives the piston rod of the stamping cylinder to move up and down, and completes the stamping and forming operation of the steel.

[0003] The existing hydraulic system has the following defects: (1) Poor system reliability: When the hydraulic pump loses power due to power failure or the hydraulic pipeline is damaged and lacks hydraulic oil, or when there is a fault in hydraulic components such as the reversing valve, the piston rod of the stamping cylinder will be stuck in a certain position and cannot move. In this case, it is impossible to replace or repair the mold, or remove the steel or anchor plate. More seriously, if the operator's body is stuck, it is impossible to quickly move the piston rod of the stamping cylinder in a short time, which poses a safety hazard.

[0004] (2) Serious energy waste: When feeding steel into the stamping die under the piston rod of the stamping cylinder and taking out the formed anchor plate, the hydraulic pump is in working state, while the stamping cylinder is in stopping state. During this period, the hydraulic energy output by the hydraulic pump cannot be recycled, which not only wastes electrical energy, but also causes the utilization rate of the hydraulic pump to be only 50%-60%. At the same time, the hydraulic pump frequently switches between heavy load and light load, which accelerates equipment loss.

[0005] (3) Insufficient adaptability: Since the system parameters need to be designed based on the largest and thickest anchor plate (such as 200mm side length × 200mm side length × 6mm thickness), a high-power hydraulic pump and a large-flow reversing valve must be used. However, when processing smaller and thinner anchor plates (such as 160mm side length × 160mm side length × 4mm thickness), the utilization rate of the hydraulic system is significantly low, resulting in high equipment costs.

[0006] (4) The impact problem is prominent: When the stamping cylinder runs at high speed, the cylinder seal, hydraulic pipeline, hydraulic valve, and hydraulic pump will be subjected to high-frequency impact, resulting in a high failure rate and short service life of the hydraulic system. Summary of the invention

[0007] The invention proposes an energy-saving and efficient hydraulic system for an anchor plate press, the purpose of which is to solve the problems of low reliability, low energy utilization, insufficient adaptability and large impact in the existing system.

[0008] The technical solution of the present invention is as follows: An energy-saving and efficient anchor plate press hydraulic system, comprising a main oil tank for containing hydraulic oil, a filter, a hydraulic pump, a main relief valve, a main valve and a stamping oil cylinder; the stamping oil cylinder is installed vertically with a piston rod facing downward; the oil inlet of the hydraulic pump is connected to the main oil tank through a filter, the oil outlet is connected to the P port of the main relief valve, the oil outlet of the hydraulic pump is also connected to the stamping oil cylinder through the main valve, and the hydraulic system also comprises a sequence valve and a backup system; The oil outlet of the hydraulic pump is also connected to the main valve via a sequence valve; The oil outlet of the hydraulic pump is also connected to the backup system; the backup system includes a backup system accumulator and a backup system manual reversing valve, and the oil inlet and outlet of the backup system accumulator are connected to the stamping cylinder through the backup system manual reversing valve.

[0009] As a further improvement of the energy-saving and efficient hydraulic system of the anchor plate press: the backup system also includes a backup system filling valve; The oil outlet of the hydraulic pump is connected to the P port of the backup system charging valve, the T port of the backup system charging valve is connected to the main oil tank, and the A port is connected to the oil inlet and outlet of the backup system accumulator; The manual reversing valve of the backup system is a manual three-position four-way valve; The oil inlet and outlet ports of the backup system accumulator are connected to the P port of the backup system manual reversing valve; the T port of the backup system manual reversing valve is connected to the main oil tank; the A port and B port of the backup system manual reversing valve are respectively connected to the rod chamber and rodless chamber of the stamping cylinder; When the valve core of the manual reversing valve of the backup system is in the middle position, ports P, T, A and B are all in a closed state, and the stamping cylinder does not move; when the valve core is in the left position, ports P and B are connected, ports A and T are connected, and the piston rod of the stamping cylinder descends; when the valve core is in the right position, ports P and A are connected, ports B and T are connected, and the piston rod of the stamping cylinder rises.

[0010] As a further improvement of the energy-saving and efficient hydraulic system of the anchor plate press: the backup system also includes a backup system speed regulating valve; The oil inlet and outlet ports of the backup system accumulator are connected to the P port of the backup system manual reversing valve through the system speed regulating valve.

[0011] As a further improvement of the energy-saving and efficient hydraulic system of the anchor plate press: the main valve is a three-position six-way solenoid valve; The outlet P2 of the sequence valve is connected to the P1 port and the P port of the main valve respectively; the A port and the B port of the main valve are connected to the rodless chamber and the rod chamber of the stamping cylinder respectively; the P2 port of the main valve is connected to the pressurizing system, and the T port is connected to the main oil tank; When the valve core of the three-position six-way solenoid valve is in the middle position, ports P and P2 are connected, ports A, B, P1 and T are all closed, and the hydraulic oil flows to the pressurized system; when the valve core is in the left position, ports P and P2 are closed, ports P1 and A are connected, ports B and T are connected, and the piston rod of the stamping cylinder descends; when the valve core is in the right position, ports P and P2 are closed, ports P1 and B are connected, ports A and T are connected, and the piston rod of the stamping cylinder rises.

[0012] As a further improvement of the energy-saving and efficient anchor plate press hydraulic system: a stamping system one-way valve is also installed between the outlet P2 of the sequence valve and the P1 port of the stamping system main valve, and the conduction direction of the stamping system one-way valve is from the P2 port of the sequence valve to the P1 port of the main valve.

[0013] As a further improvement of the energy-saving and efficient anchor plate press hydraulic system: a stamping system one-way speed regulating valve is also installed between the A port of the main valve and the rodless chamber of the stamping cylinder; when the hydraulic oil flows from the A port of the main valve to the rodless chamber of the stamping cylinder, the one-way valve in the stamping system one-way speed regulating valve opens, and vice versa, the stamping system one-way speed regulating valve plays a speed regulating role.

[0014] As a further improvement of the energy-saving and efficient anchor plate press hydraulic system: the pressurizing system includes a pressurizing system filling valve, a pressurizing system accumulator, a pressurizing system check valve, a pressurizing system speed regulating valve and a pressurizing system electric control valve; The electric control valve of the pressurization system is a two-position four-way solenoid valve; The P2 port of the main valve is connected to the P port of the pressurized system charging valve; the A port of the pressurized system charging valve is connected to the oil inlet and outlet ports of the pressurized system accumulator and the P port of the pressurized system electric control valve respectively; the T port of the pressurized system charging valve is connected to the main oil tank; The A port of the pressurizing system electric control valve is connected to the rodless chamber of the stamping oil cylinder through the pressurizing system speed regulating valve and the pressurizing system check valve connected in series; the conducting direction of the pressurizing system check valve is from the A port of the pressurizing system electric control valve to the rodless chamber of the stamping oil cylinder; When the valve core of the pressurizing system electric control valve is in the left position, the P port, the A port, the B port and the T port are all in a closed state; when the valve core is in the right position, the P port and the A port are connected, and the B port and the T port are connected.

[0015] As a further improvement of the energy-saving and efficient hydraulic system of the anchor plate press: it also includes a filling system; The filling system includes a stamping filling electric control valve, a stamping filling valve and a filling valve high-level oil tank; The stamping liquid filling electric control valve is a two-position four-way solenoid valve; the A port of the pressurizing system filling valve is connected to the P port of the stamping liquid filling electric control valve, and the A port of the stamping liquid filling electric control valve is connected to the K port of the stamping liquid filling valve; When the valve core of the stamping liquid filling electric control valve is in the left position, the P port, A port, B port and T port are all in a closed state; when the valve core is in the right position, the P port and the A port are connected, and the B port and the T port are connected; The stamping filling valve and the filling valve high-position oil tank are located above the stamping oil cylinder, the A port of the stamping filling valve is connected to the filling valve high-position oil tank, and the B port is connected to the rodless chamber of the stamping oil cylinder.

[0016] As a further improvement of the energy-saving and efficient anchor plate press hydraulic system: it also includes a rod chamber oil replenishment check valve, a rod chamber relief valve, a rodless chamber oil replenishment check valve and a rodless chamber relief valve; The A port of the rod chamber oil replenishment check valve is connected to the main oil tank, and the B port is connected to the rod chamber of the stamping cylinder. The conducting direction is from the main oil tank to the rod chamber of the stamping cylinder; the P port of the rod chamber relief valve is connected to the rod chamber of the stamping cylinder, and the T port is connected to the main oil tank; The A port of the rodless chamber oil replenishing check valve is connected to the main oil tank, and the B port is connected to the rodless chamber of the stamping cylinder. Its conduction direction is from the main oil tank to the rodless chamber of the stamping cylinder; the P port of the rodless chamber overflow valve is connected to the rodless chamber of the stamping cylinder, and the T port is connected to the main oil tank.

[0017] As a further improvement of the energy-saving and efficient hydraulic system of the anchor plate press, the working method is as follows: The hydraulic oil in the main oil tank is filtered by the filter and then enters the hydraulic pump, which outputs high-pressure hydraulic oil. When the hydraulic oil pressure reaches the first preset opening oil pressure and the backup system accumulator pressure is lower than the first preset opening oil pressure, the backup system filling valve of the backup system opens, and the high-pressure hydraulic oil enters the backup system accumulator through the backup system filling valve for filling. When the pressure reaches the upper limit oil pressure of the backup accumulator, the backup system filling valve closes. When the hydraulic pump outlet pressure rises to the preset pressure, the sequence valve opens, and the high-pressure hydraulic oil is divided into two paths: one path enters the P1 port of the main valve through the punching system check valve, and the other path flows to the pressurization system charging valve through the P2 port of the main valve; If the pressure of the pressurized system accumulator is lower than the second preset opening oil pressure, the pressurized system filling valve opens, and high-pressure hydraulic oil enters the pressurized system accumulator to fill the pressurized system until the pressure reaches the set value, and then the pressurized system filling valve closes; The control process of the stamping cylinder is as follows: First, control the piston rod of the stamping cylinder to descend quickly: the main valve is switched to the left position, and the high-pressure hydraulic oil flows from the P1 port to the A port, and enters the rodless chamber of the stamping cylinder through the one-way speed regulating valve of the stamping system. At the same time, the hydraulic oil in the rod chamber flows back to the main oil tank through the B port and the T port of the main valve; the stamping filling electric control valve is powered on and switched to the right position, the stamping filling valve is opened, and the hydraulic oil in the high-position oil tank of the filling valve is quickly replenished to the rodless chamber; Then, the piston rod of the stamping oil cylinder is controlled to continue to descend for stamping operation: the main valve remains in the left position, the electric control valve of the pressurizing system is powered on and switched to the right position, the electric control valve of the stamping liquid filling is switched back to the left position, the stamping liquid filling valve is closed, and the high-pressure hydraulic oil in the accumulator of the pressurizing system enters the rodless chamber of the stamping oil cylinder through the speed regulating valve of the pressurizing system and the one-way valve of the pressurizing system to enhance the stamping force and stamping speed; the opening of the speed regulating valve of the pressurizing system can be adjusted according to the thickness of the anchor plate to meet different stamping requirements; Then, the piston rod of the stamping oil cylinder is controlled to rise and return quickly: the electronic control valve of the pressurizing system switches back to the left position, the electronic control valve of the stamping liquid filling switches to the right position, the main valve switches to the right position, and the high-pressure hydraulic oil flows from the P1 port to the B port and enters the rod chamber of the stamping oil cylinder. At the same time, the hydraulic oil in the rodless chamber is quickly discharged into the high-position oil tank of the filling valve through the stamping liquid filling valve, so that the piston rod can rise quickly; after the piston rod returns to its position, the electronic control valve of the stamping liquid filling switches back to the left position, and the stamping liquid filling valve is closed; Finally, the main valve switches back to the middle position, the stamping cylinder remains stationary, the hydraulic pump replenishes the hydraulic oil for the pressurized system accumulator, and then waits for the next stamping cycle.

[0018] Compared with the prior art, the present invention has the following positive effects: (1) The present invention realizes the oil cylinder control in emergency state through the backup system, thereby improving the reliability of the system. When the piston rod of the stamping oil cylinder is stuck due to reasons such as power failure of the hydraulic pump or damage of the hydraulic pipeline, the backup system manual reversing valve can be used to control the backup system accumulator to release the pressure oil and drive the stamping oil cylinder to operate in an emergency. This design not only ensures the operating space for mold replacement and workpiece placement, but also enables rapid rescue when the operator's body is stuck, effectively responding to emergencies.

[0019] (2) The present invention achieves efficient energy utilization through the energy storage device. On the one hand, during the interval between mold loading and unloading, the high-pressure hydraulic oil output by the hydraulic pump is stored in the pressurized system accumulator through the pressurized system charging valve. On the other hand, during the stamping operation, the pressure oil in the accumulator enters the rodless chamber through the pressurized system electric control valve, the pressurized system speed regulating valve and the pressurized system one-way valve. This design improves the utilization rate of the hydraulic pump, not only reduces energy consumption, but also avoids the frequent switching of the hydraulic pump between heavy load and light load, reducing equipment loss.

[0020] (3) The hydraulic pump and the accumulator of the pressurizing system in the present invention can supply oil in parallel and simultaneously inject high-pressure oil into the rodless chamber, thereby increasing the punching force and punching speed and ensuring the punching force requirements. This eliminates the need to configure an ultra-high-power hydraulic pump and a large-diameter reversing valve, and can adapt to various production conditions at a lower cost.

[0021] (4) The present invention is also provided with an oil replenishing one-way valve and a relief valve connected to the oil cylinder. The oil replenishing one-way valve can replenish oil to the rod chamber and the rodless chamber in time, and the relief valve is used to play a buffering and protective role to ensure the stability of the system pressure and extend the service life of the hydraulic pipeline and hydraulic components. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the hydraulic principle diagram of the present invention.

[0023] Reference numerals include: 1. Main oil tank; 2. Hydraulic oil; 3. Filter; 4. Hydraulic pump; 5. Main overflow valve; 6. Sequence valve; 7. Backup system filling valve; 8. Backup system accumulator; 9. Backup system speed control valve; 10. Backup system manual reversing valve; 11. Stamping cylinder; 12. Stamping system one-way valve; 13. Main valve; 14. Stamping system one-way speed control valve; 15. Pressurization system filling valve; 16. Pressurization system accumulator; 17. Stamping filling electric control valve; 18. Pressurization system one-way valve; 19. Pressurization system speed control valve; 20. Pressurization system electric control valve; 21. Stamping filling valve; 22. Filling valve high-level oil tank; 23. Rod chamber oil replenishment one-way valve; 24. Rod chamber overflow valve; 25. Rodless chamber oil replenishment one-way valve; 26. Rodless chamber overflow valve. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0025] like Figure 1 , an energy-saving and efficient anchor plate press hydraulic system, including a main oil tank 1 for containing hydraulic oil 2, and also including a filter 3, a hydraulic pump 4, a main relief valve 5, a sequence valve 6, a backup system filling valve 7, a backup system accumulator 8, a backup system speed regulating valve 9, a backup system manual reversing valve 10, a stamping cylinder 11, a stamping system one-way valve 12, a main valve 13, a stamping system one-way speed regulating valve 14, a pressurizing system filling valve 15, a pressurizing system accumulator 16, a stamping filling electric control valve 17, a pressurizing system one-way valve 18, a pressurizing system speed regulating valve 19, a pressurizing system electric control valve 20, a stamping filling valve 21, a filling valve high-level oil tank 22, a rod cavity oil replenishment one-way valve 23, a rod cavity relief valve 24, a rodless cavity oil replenishment one-way valve 25 and a rodless cavity relief valve 26.

[0026] Specifically: The punching cylinder 11 is installed vertically, with the piston rod facing downwards.

[0027] The hydraulic pump 4 is an electric variable piston pump with a rated pressure of 31.5 MPa. The oil inlet of the hydraulic pump 4 is connected to the main oil tank 1 through the filter 3, and the oil outlet is connected to the P port of the main relief valve 5, which is used to output high-pressure hydraulic oil 2. The opening pressure of the main relief valve 5 is set to 31.6 MPa, which plays a role in limiting the system pressure and protecting the hydraulic system.

[0028] The oil outlet of the hydraulic pump 4 is also connected to the P1 port of the sequence valve 6 .

[0029] The backup system is composed of a backup system filling valve 7, a backup system accumulator 8, a backup system speed regulating valve 9, and a backup system manual reversing valve 10.

[0030] The oil outlet of the hydraulic pump 4 is connected to the P port of the backup system charging valve 7. The T port of the backup system charging valve 7 is connected to the main oil tank 1, and the A port is connected to the oil inlet and outlet of the backup system accumulator 8 and the A port of the backup system speed regulating valve 9 respectively. The backup system manual reversing valve 10 is a manual three-position four-way valve. The B port of the backup system speed regulating valve 9 is connected to the P port of the backup system manual reversing valve 10, and the T port of the backup system manual reversing valve 10 is connected to the main oil tank 1. The A port and the B port of the backup system manual reversing valve 10 are respectively connected to the rod chamber and the rodless chamber of the stamping cylinder 11. When the valve core of the manual reversing valve 10 of the backup system is in the middle position, the P port, T port, A port and B port are all in the closed state, and the stamping cylinder 11 does not move; when the valve core is in the left position, the P port and the B port are connected, the A port and the T port are connected, and the piston rod of the stamping cylinder 11 descends; when the valve core is in the right position, the P port and the A port are connected, the B port and the T port are connected, and the piston rod of the stamping cylinder 11 rises.

[0031] When the pressure at the P1 port of the sequence valve 6 is lower than the preset pressure of 15MPa, the sequence valve 6 is closed, and the high-pressure hydraulic oil 2 is only provided to the backup system, ensuring that the backup system has priority in using the oil. When the hydraulic oil 2 output by the hydraulic pump 4 is greater than 6Mpa and the pressure of the backup system accumulator 8 is lower than 6MPa, the hydraulic oil 2 enters the backup system accumulator 8 through the backup system filling valve 7 for filling. When the pressure of the backup system accumulator 8 reaches 12MPa, the backup system filling valve 7 is closed to complete the filling.

[0032] When the system loses power due to power failure of the hydraulic pump 4, or the hydraulic pipeline of the system is damaged and lacks hydraulic oil 2, or other hydraulic components such as the main valve 13 fail, causing the piston rod of the stamping cylinder 11 to stop at a certain position and unable to move, the backup system can be activated: manually switch the backup system manual reversing valve 10 to the left or right position, and the high-pressure hydraulic oil 2 in the backup system accumulator 8 enters the P port of the backup system manual reversing valve 10 through the backup system speed regulating valve 9 to drive the stamping cylinder 11 to move. The backup system speed regulating valve 9 plays the role of adjusting the lifting speed. The backup system speed regulating valve 9 can be adjusted in advance according to the required lifting speed of the piston rod of the stamping cylinder 11.

[0033] When the pressure of the backup system accumulator 8 is equal to 12MPa, the stored high-pressure hydraulic oil 2 can ensure that the piston rod of the stamping cylinder 11 can be raised and lowered 5-10 times, and the mold can still be replaced and repaired, and the steel and anchor plate can also be taken out. If the operator's body is stuck, the piston rod of the stamping cylinder 11 can be quickly moved in a short time to deal with emergencies and improve the reliability and safety of the hydraulic system.

[0034] The main valve 13 is a three-position six-way solenoid valve. The outlet P2 of the sequence valve 6 is connected to the P1 port of the main valve 13 and the P port of the main valve 13, respectively. A stamping system check valve 12 is also installed between the outlet P2 of the sequence valve 6 and the P1 port of the stamping system main valve 13. The conduction direction of the stamping system check valve 12 is from the P2 port of the sequence valve 6 to the P1 port of the main valve 13. The A port and the B port of the main valve 13 are respectively connected to the rodless cavity and the rod cavity of the stamping cylinder 11. A stamping system check valve 14 is also installed between the A port of the main valve 13 and the rodless cavity of the stamping cylinder 11. When the hydraulic oil flows from the A port of the main valve 13 to the rodless cavity of the stamping cylinder 11, the check valve in the stamping system check valve 14 is opened, and vice versa, the stamping system check valve 14 plays a speed regulating role. The P2 port of the main valve 13 is connected to the pressurized system, and the T port is connected to the main oil tank 1. When the valve core is in the middle position, the P port and the P2 port are connected, the A, B, P1, and T ports are all closed, and the hydraulic oil 2 flows to the pressurized system; when the valve core is in the left position, the P port and the P2 port are closed, the P1 port and the A port are connected, the B port and the T port are connected, and the piston rod of the stamping oil cylinder 11 descends; when the valve core is in the right position, the P and P2 ports are closed, the P1 port and the B port are connected, the A port and the T port are connected, and the piston rod of the stamping oil cylinder 11 rises.

[0035] When the pressure at the P1 port of the sequence valve 6 is higher than the preset pressure of 15 MPa, the sequence valve 6 opens, and the high-pressure hydraulic oil 2 output by the hydraulic pump 4 reaches the P port and P1 port of the main valve 13 through the sequence valve 6. At this time, the stamping cylinder 11 can be controlled by controlling the main valve 13.

[0036] The pressurizing system liquid charging valve 15, the pressurizing system accumulator 16, the pressurizing system non-return valve 18, the pressurizing system speed regulating valve 19, and the pressurizing system electric control valve 20 constitute the pressurizing system.

[0037] The P2 port of the main valve 13 is connected to the P port of the pressurized system charging valve 15. The pressurized system electric control valve 20 is a two-position four-way solenoid valve. The A port of the pressurized system charging valve 15 is connected to the oil inlet and outlet ports of the pressurized system accumulator 16 and the P port of the pressurized system electric control valve 20 respectively. The T port of the pressurized system charging valve 15 is connected to the main oil tank 1. The pressurized system accumulator 16 plays the role of storing and releasing hydraulic energy.

[0038] The port A of the pressurizing system electric control valve 20 is connected to the rodless chamber of the stamping cylinder 11 through the pressurizing system speed regulating valve 19 and the pressurizing system check valve 18 connected in series. The conducting direction of the pressurizing system check valve 18 is from the port A of the pressurizing system electric control valve 20 to the rodless chamber of the stamping cylinder 11.

[0039] When the valve core of the pressurizing system electric control valve 20 is in the left position, the P port, the A port, the B port and the T port are all in a closed state; when the valve core is in the right position, the P port and the A port are connected, and the B port and the T port are connected.

[0040] The function of the pressurizing system is: when the stamping cylinder 11 stamps the anchor plate, that is, when the rodless chamber of the stamping cylinder 11 is filled with hydraulic oil 2, the high-pressure hydraulic oil 2 in the pressurizing system accumulator 16 can also enter the rodless chamber of the stamping cylinder 11 through the pressurizing system electric control valve 20, the pressurizing system speed regulating valve 19, and the pressurizing system one-way valve 18. The flow rate can be adjusted by the pressurizing system speed regulating valve 19 to adapt to anchor plates of different thicknesses. The pressurizing system one-way valve 18 can prevent the hydraulic oil 2 at the B port of the stamping system one-way speed regulating valve 14 from entering the pressurizing system accumulator 16. The pressurizing system can not only make full use of the hydraulic energy stored in the pressurizing system accumulator 16 when the stamping cylinder 11 is not in action, but also improve the stamping capacity and stamping speed of the stamping cylinder 11.

[0041] The stamping filling electric control valve 17, the stamping filling valve 21 and the filling valve high-level oil tank 22 constitute a filling system.

[0042] The stamping liquid filling electric control valve 17 is a two-position four-way solenoid valve. The A port of the pressurizing system filling valve 15 is connected to the P port of the stamping liquid filling electric control valve 17, and the A port of the stamping liquid filling electric control valve 17 is connected to the K port of the stamping liquid filling valve 21. When the valve core of the stamping liquid filling electric control valve 17 is in the left position, the P port, the A port, the B port, and the T port are all in a closed state; when the valve core is in the right position, the P port and the A port are connected, and the B port and the T port are connected.

[0043] The stamping filling valve 21 and the filling valve high-position oil tank 22 are located above the stamping oil cylinder 11. The stamping filling valve 21 is a large-flow hydraulically controlled one-way valve, whose A port is connected to the filling valve high-position oil tank 22, and whose B port is connected to the rodless chamber of the stamping oil cylinder 11.

[0044] Under the control of the stamping filling electric control valve 17 , the hydraulic oil 2 in the filling valve high-level oil tank 22 can quickly enter the rodless chamber of the stamping oil cylinder 11 .

[0045] Furthermore, the A port of the rod chamber oil replenishing check valve 23 is connected to the main oil tank 1, and the B port is connected to the rod chamber of the stamping oil cylinder 11, and its conduction direction is from the main oil tank 1 to the rod chamber of the stamping oil cylinder 11. The rod chamber relief valve 24 is set to a pressure of 35MPa, and its P port is connected to the rod chamber of the stamping oil cylinder 11, and its T port is connected to the main oil tank 1. The rod chamber oil replenishing check valve 23 can automatically replenish oil when the rod chamber of the stamping oil cylinder 11 is under instantaneous negative pressure, thereby reducing the impact of the hydraulic system. The rod chamber relief valve 24 can automatically release pressure when the rod chamber of the stamping oil cylinder 11 is under instantaneous extremely high pressure, thereby reducing the impact of the hydraulic system.

[0046] The A port of the rodless chamber oil replenishment check valve 25 is connected to the main oil tank 1, and the B port is connected to the rodless chamber of the stamping oil cylinder 11. Its conduction direction is from the main oil tank 1 to the rodless chamber of the stamping oil cylinder 11. The set pressure of the rodless chamber relief valve 26 is 35MPa, its P port is connected to the rodless chamber of the stamping oil cylinder 11, and its T port is connected to the main oil tank 1. The rodless chamber oil replenishment check valve 25 can automatically replenish oil when the rodless chamber of the stamping oil cylinder 11 is instantly under negative pressure, thereby reducing the impact of the hydraulic system. The rodless chamber relief valve 26 can automatically release pressure when the rodless chamber of the stamping oil cylinder 11 is instantly under extremely high pressure, thereby reducing the impact of the hydraulic system.

[0047] Under the action of the rod chamber oil replenishing check valve 23, the rod chamber overflow valve 24, the rodless chamber oil replenishing check valve 25 and the rodless chamber overflow valve 26, even if the stamping cylinder 11 moves more than 2000 times per hour, the hydraulic system of the anchor plate press can still operate stably without obvious hydraulic shock, which greatly extends the service life of the hydraulic pipelines and hydraulic components.

[0048] The working principle of this system is: 1. Under normal power supply conditions: When the system is powered on and the hydraulic pump 4 is working normally, the hydraulic system operates according to the following process: The hydraulic oil 2 in the main oil tank 1 is filtered by the filter 3 and then enters the hydraulic pump 4, and the hydraulic pump 4 outputs the high-pressure hydraulic oil 2. When the pressure of the hydraulic oil 2 reaches the first preset opening oil pressure of 6MPa and the pressure of the backup system accumulator 8 is lower than the first preset opening oil pressure of 6MPa, the backup system filling valve 7 is opened, and the high-pressure hydraulic oil 2 enters the backup system accumulator 8 through the backup system filling valve 7 for filling. When the pressure reaches the upper limit oil pressure of the backup energy storage of 12MPa, the backup system filling valve 7 is closed.

[0049] When the outlet pressure of the hydraulic pump 4 rises to the preset pressure of 15MPa, the sequence valve 6 opens, and the high-pressure hydraulic oil 2 is divided into two paths: one path enters the P1 port of the main valve 13 through the punching system check valve 12, and the other path flows to the pressurizing system filling valve 15 through the P2 port of the main valve 13. If the pressure of the pressurizing system accumulator 16 is lower than the second preset opening oil pressure of 31.5MPa, the pressurizing system filling valve 15 opens, and the high-pressure hydraulic oil 2 enters the pressurizing system accumulator 16 to fill the liquid, until the pressure reaches the set value and the pressurizing system filling valve 15 is closed.

[0050] The control process of the stamping cylinder 11 is as follows: First, the piston rod of the stamping oil cylinder 11 is controlled to descend rapidly: the main valve 13 is switched to the left position, and the high-pressure hydraulic oil 2 flows from the P1 port to the A port, and enters the rodless chamber of the stamping oil cylinder 11 through the stamping system one-way speed regulating valve 14. At the same time, the hydraulic oil 2 in the rod chamber flows back to the main oil tank 1 through the B port and the T port of the main valve 13. The stamping filling electric control valve 17 is powered on and switched to the right position, and the stamping filling valve 21 is opened, and the hydraulic oil 2 in the filling valve high-level oil tank 22 is quickly replenished to the rodless chamber. At the same time, the rodless chamber oil replenishment one-way valve 25 is also automatically opened to replenish oil from the main oil tank 1 to avoid negative pressure in the rodless chamber due to the rapid descent of the piston.

[0051] Then, the piston rod of the stamping oil cylinder 11 is controlled to continue to descend for stamping operation: the main valve 13 remains in the left position, the pressurizing system electric control valve 20 is powered on and switched to the right position, the stamping liquid filling electric control valve 17 is switched back to the left position, the stamping liquid filling valve 21 is closed, and the high-pressure hydraulic oil 2 in the pressurizing system accumulator 16 enters the rodless chamber of the stamping oil cylinder 11 through the pressurizing system speed regulating valve 19 and the pressurizing system one-way valve 18 to enhance the stamping force and stamping speed. The opening of the pressurizing system speed regulating valve 19 can be adjusted according to the thickness of the anchor plate to meet different stamping requirements. When the outer dimensions of the anchor plate to be stamped (side length 160mm×side length 160mm×thickness 4mm) are not large and the thickness is average, the pressurizing system speed regulating valve 19 opens about 1 / 3, which allows the stamping cylinder 11 to quickly and efficiently complete the stamping operation of the anchor plate. When the outer dimensions of the anchor plate to be stamped (side length 200mm×side length 200mm×thickness 6mm) are large and the thickness is thick, the pressurizing system speed regulating valve 19 opens about 2 / 3, which allows the stamping cylinder 11 to quickly and efficiently complete the stamping operation of extra-large and extra-thick anchor plates.

[0052] Then, the piston rod of the stamping oil cylinder 11 is controlled to rise quickly and return to its original position: the pressurizing system electric control valve 20 is switched back to the left position, the stamping liquid filling electric control valve 17 is switched to the right position, the main valve 13 is switched to the right position, and the high-pressure hydraulic oil 2 flows from the P1 port to the B port and enters the rod chamber of the stamping oil cylinder 11. At the same time, the hydraulic oil 2 in the rodless chamber is quickly discharged into the filling valve high-position oil tank 22 through the stamping liquid filling valve 21, so as to realize the rapid rise of the piston rod. After the piston rod returns to its original position, the stamping liquid filling electric control valve 17 is switched back to the left position, and the stamping liquid filling valve 21 is closed.

[0053] Finally, the main valve 13 switches back to the middle position, the stamping cylinder 11 remains stationary, the hydraulic pump 4 replenishes the hydraulic oil 2 for the pressurizing system accumulator 16, and then waits for the next stamping cycle. At this time, the steel plate can be fed into the stamping die under the piston rod of the stamping cylinder 11, and the anchor plate in the stamping die can be pushed out.

[0054] 2. When power is off or the system fails: When the hydraulic pump 4 loses power or the main system fails to work due to a fault, the backup system can be activated to manually control the stamping cylinder 11: Piston rising operation of the stamping cylinder 11: manually switch the backup system manual reversing valve 10 to the right position, and the high-pressure hydraulic oil 2 in the backup system accumulator 8 enters the P port of the backup system manual reversing valve 10 through the backup system speed regulating valve 9, and then enters the rod chamber of the stamping cylinder 11 through the A port, pushing the piston rod of the stamping cylinder 11 to rise; at the same time, the hydraulic oil 2 in the rodless chamber of the stamping cylinder 11 flows back to the main oil tank 1 through the B port and T port of the backup system manual reversing valve 10.

[0055] Piston lowering operation of the stamping cylinder 11: Manually switch the backup system manual reversing valve 10 to the left position, and the high-pressure hydraulic oil 2 enters the rodless chamber of the stamping cylinder 11 through the P port and the B port. At the same time, the hydraulic oil 2 in the rod chamber flows back to the main oil tank 1 through the A port and the T port to realize the piston lowering.

[0056] The speed of the cylinder movement can be pre-adjusted through the backup system speed regulating valve 9, and the 12MPa pressure of the backup system accumulator 8 can support the piston to perform 5-10 lifting operations, ensuring that mold replacement or personnel rescue can still be completed in an emergency.

[0057] When it is necessary to stop the piston movement, the backup system manual reversing valve 10 is switched to the middle position, all oil ports are closed, and the stamping cylinder 11 is locked in the current position.

[0058] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. The scope of the present invention is defined by the claims rather than the above description.

Claims

1. An energy-saving and efficient hydraulic system for an anchor plate press, comprising a main oil tank (1) for containing hydraulic oil (2), a filter (3), a hydraulic pump (4), a main overflow valve (5), a main valve (13) and a punching cylinder (11); the punching cylinder (11) is installed vertically with a piston rod facing downward; the oil inlet of the hydraulic pump (4) is connected to the main oil tank (1) through the filter (3), the oil outlet is connected to the P port of the main overflow valve (5), and the oil outlet of the hydraulic pump (4) is also connected to the punching cylinder (11) through the main valve (13), characterized in that: The hydraulic system also includes a sequence valve (6) and a backup system; The oil outlet of the hydraulic pump (4) is also connected to the main valve (13) via a sequence valve (6); The oil outlet of the hydraulic pump (4) is also connected to the backup system; the backup system comprises a backup system accumulator (8) and a backup system manual reversing valve (10); the oil inlet and outlet of the backup system accumulator (8) are connected to the punching cylinder (11) via the backup system manual reversing valve (10).

2. The energy-saving and efficient anchor plate press hydraulic system according to claim 1, characterized in that: The backup system also includes a backup system filling valve (7); The oil outlet of the hydraulic pump (4) is connected to the P port of the standby system charging valve (7), the T port of the standby system charging valve (7) is connected to the main oil tank (1), and the A port is connected to the oil inlet and outlet ports of the standby system accumulator (8); The backup system manual reversing valve (10) is a manual three-position four-way valve; The oil inlet and outlet ports of the backup system accumulator (8) are connected to the P port of the backup system manual reversing valve (10); the T port of the backup system manual reversing valve (10) is connected to the main oil tank (1); the A port and the B port of the backup system manual reversing valve (10) are respectively connected to the rod chamber and the rodless chamber of the stamping oil cylinder (11); When the valve core of the backup system manual reversing valve (10) is in the middle position, the P port, T port, A port and B port are all in a closed state, and the stamping oil cylinder (11) does not move; when the valve core is in the left position, the P port and the B port are connected, and the A port and the T port are connected, and the piston rod of the stamping oil cylinder (11) descends; when the valve core is in the right position, the P port and the A port are connected, and the B port and the T port are connected, and the piston rod of the stamping oil cylinder (11) rises.

3. The energy-saving and efficient anchor plate press hydraulic system according to claim 2, characterized in that: The backup system also includes a backup system speed regulating valve (9); The oil inlet and outlet ports of the backup system accumulator (8) are connected to the P port of the backup system manual reversing valve (10) through the system speed regulating valve (9).

4. The energy-saving and efficient anchor plate press hydraulic system according to claim 1, characterized in that: The main valve (13) is a three-position six-way solenoid valve; The outlet P2 of the sequence valve (6) is connected to the P1 port of the main valve (13) and the P port of the main valve (13) respectively; the A port and the B port of the main valve (13) are connected to the rodless chamber and the rod chamber of the punching cylinder (11) respectively; the P2 port of the main valve (13) is connected to the pressurizing system, and the T port is connected to the main oil tank (1); When the valve core of the three-position six-way solenoid valve is in the middle position, ports P and P2 are connected, ports A, B, P1 and T are all closed, and hydraulic oil (2) flows to the pressurized system; when the valve core is in the left position, ports P and P2 are closed, ports P1 and A are connected, ports B and T are connected, and the piston rod of the stamping cylinder (11) descends; when the valve core is in the right position, ports P and P2 are closed, ports P1 and B are connected, ports A and T are connected, and the piston rod of the stamping cylinder (11) rises.

5. The energy-saving and efficient anchor plate press hydraulic system according to claim 4, characterized in that: A stamping system check valve (12) is also installed between the outlet P2 of the sequence valve (6) and the P1 port of the stamping system main valve (13). The conducting direction of the stamping system check valve (12) is from the P2 port of the sequence valve (6) to the P1 port of the main valve (13).

6. The energy-saving and efficient hydraulic system for anchor plate press according to claim 4, characterized in that: A stamping system one-way speed regulating valve (14) is also installed between the A port of the main valve (13) and the rodless chamber of the stamping oil cylinder (11); when the hydraulic oil (2) flows from the A port of the main valve (13) to the rodless chamber of the stamping oil cylinder (11), the one-way valve in the stamping system one-way speed regulating valve (14) opens, and vice versa, the stamping system one-way speed regulating valve (14) plays a speed regulating role.

7. The energy-saving and efficient anchor plate press hydraulic system according to claim 4, characterized in that: The pressurizing system comprises a pressurizing system filling valve (15), a pressurizing system accumulator (16), a pressurizing system check valve (18), a pressurizing system speed regulating valve (19) and a pressurizing system electric control valve (20); The pressurizing system electric control valve (20) is a two-position four-way solenoid valve; The P2 port of the main valve (13) is connected to the P port of the pressurized system charging valve (15); the A port of the pressurized system charging valve (15) is respectively connected to the oil inlet and outlet ports of the pressurized system accumulator (16) and the P port of the pressurized system electric control valve (20); the T port of the pressurized system charging valve (15) is connected to the main oil tank (1); The port A of the pressurizing system electric control valve (20) is connected to the rodless chamber of the stamping oil cylinder (11) through the pressurizing system speed regulating valve (19) and the pressurizing system non-return valve (18) connected in series; the conducting direction of the pressurizing system non-return valve (18) is from the port A of the pressurizing system electric control valve (20) to the rodless chamber of the stamping oil cylinder (11); When the valve core of the pressurizing system electric control valve (20) is in the left position, the P port, the A port, the B port and the T port are all in a closed state; when the valve core is in the right position, the P port and the A port are connected, and the B port and the T port are connected.

8. The energy-saving and efficient hydraulic system for anchor plate press according to claim 7, characterized in that: Also included is a liquid filling system; The liquid filling system comprises a stamping liquid filling electric control valve (17), a stamping liquid filling valve (21) and a liquid filling valve high-level oil tank (22); The stamping liquid filling electric control valve (17) is a two-position four-way solenoid valve; the A port of the pressurizing system liquid filling valve (15) is connected to the P port of the stamping liquid filling electric control valve (17), and the A port of the stamping liquid filling electric control valve (17) is connected to the K port of the stamping liquid filling valve (21); When the valve core of the stamping and filling electric control valve (17) is in the left position, the P port, the A port, the B port and the T port are all in a closed state; when the valve core is in the right position, the P port and the A port are connected, and the B port and the T port are connected; The punching filling valve (21) and the filling valve high-position oil tank (22) are located above the punching oil cylinder (11); the A port of the punching filling valve (21) is connected to the filling valve high-position oil tank (22); and the B port is connected to the rodless chamber of the punching oil cylinder (11).

9. The energy-saving and efficient anchor plate press hydraulic system according to any one of claims 1 to 8, characterized in that: It also includes a rod chamber oil replenishment check valve (23), a rod chamber overflow valve (24), a rodless chamber oil replenishment check valve (25) and a rodless chamber overflow valve (26); The A port of the rod chamber oil replenishment check valve (23) is connected to the main oil tank (1), and the B port is connected to the rod chamber of the stamping oil cylinder (11), and the conducting direction is from the main oil tank (1) to the rod chamber of the stamping oil cylinder (11); the P port of the rod chamber relief valve (24) is connected to the rod chamber of the stamping oil cylinder (11), and the T port is connected to the main oil tank (1); The A port of the rodless chamber oil replenishment check valve (25) is connected to the main oil tank (1), and the B port is connected to the rodless chamber of the stamping oil cylinder (11), and the conduction direction is from the main oil tank (1) to the rodless chamber of the stamping oil cylinder (11); the P port of the rodless chamber overflow valve (26) is connected to the rodless chamber of the stamping oil cylinder (11), and the T port is connected to the main oil tank (1).

10. The energy-saving and efficient hydraulic system for anchor plate press according to claim 8, characterized in that: The working method is: The hydraulic oil (2) in the main oil tank (1) is filtered by the filter (3) and then enters the hydraulic pump (4), and the hydraulic pump (4) outputs high-pressure hydraulic oil (2); when the pressure of the hydraulic oil (2) reaches a first preset opening oil pressure and the pressure of the backup system accumulator (8) is lower than the first preset opening oil pressure, the backup system filling valve (7) of the backup system is opened, and the high-pressure hydraulic oil (2) enters the backup system accumulator (8) through the backup system filling valve (7) for filling, and when the pressure reaches the backup accumulator upper limit oil pressure, the backup system filling valve (7) is closed; When the outlet pressure of the hydraulic pump (4) rises to a preset pressure, the sequence valve (6) opens, and the high-pressure hydraulic oil (2) is divided into two paths: one path enters the P1 port of the main valve (13) through the punching system check valve (12), and the other path flows to the pressurizing system charging valve (15) through the P2 port of the main valve (13); If the pressure of the pressurizing system accumulator (16) is lower than the second preset opening oil pressure, the pressurizing system filling valve (15) is opened, and the high-pressure hydraulic oil (2) enters the pressurizing system accumulator (16) for filling, and the pressurizing system filling valve (15) is closed after the pressure reaches the set value; The control process of the punching cylinder (11) is as follows: First, the piston rod of the stamping cylinder (11) is controlled to descend rapidly: the main valve (13) is switched to the left position, and the high-pressure hydraulic oil (2) flows from the P1 port to the A port, passes through the stamping system one-way speed regulating valve (14) and enters the rodless chamber of the stamping cylinder (11). At the same time, the hydraulic oil (2) in the rod chamber flows back to the main oil tank (1) through the B port and the T port of the main valve (13); the stamping filling electric control valve (17) is powered on and switched to the right position, the stamping filling valve (21) is opened, and the hydraulic oil (2) in the filling valve high-level oil tank (22) is quickly replenished to the rodless chamber; Then, the piston rod of the stamping oil cylinder (11) is controlled to continue to descend to perform the stamping operation: the main valve (13) remains in the left position, the pressurizing system electric control valve (20) is powered on and switched to the right position, the stamping liquid filling electric control valve (17) is switched back to the left position, the stamping liquid filling valve (21) is closed, and the high-pressure hydraulic oil (2) in the pressurizing system accumulator (16) enters the rodless chamber of the stamping oil cylinder (11) through the pressurizing system speed regulating valve (19) and the pressurizing system check valve (18), thereby increasing the stamping force and stamping speed; the opening of the pressurizing system speed regulating valve (19) can be adjusted according to the thickness of the anchor plate to meet different stamping requirements; Then, the piston rod of the stamping oil cylinder (11) is controlled to rise quickly and return to the original position: the pressurizing system electric control valve (20) is switched back to the left position, the stamping liquid filling electric control valve (17) is switched to the right position, the main valve (13) is switched to the right position, and the high-pressure hydraulic oil (2) flows from the P1 port to the B port and enters the rod chamber of the stamping oil cylinder (11). At the same time, the hydraulic oil (2) in the rodless chamber is quickly discharged into the filling valve high-position oil tank (22) through the stamping liquid filling valve (21), so that the piston rod can rise quickly; after the piston rod returns to the original position, the stamping liquid filling electric control valve (17) is switched back to the left position, and the stamping liquid filling valve (21) is closed; Finally, the main valve (13) switches back to the middle position, the stamping cylinder (11) remains stationary, and the hydraulic pump (4) replenishes the hydraulic oil (2) for the pressurized system accumulator (16), and then waits for the next stamping cycle.

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