Energy-saving die changing system for a press
By integrating the hydraulic systems for lifting and clamping molds during press mold replacement, and utilizing a set of pump station motors and control systems, combined with accumulator pressure management, the problem of high energy consumption during press mold replacement was solved, achieving a more efficient energy-saving effect.
Patent Information
- Application Number
- CN202310555262.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-05-17
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2043-05-17
AI Technical Summary
Existing presses consume a lot of energy during mold changing, and the frequent starting of the mold lifting and clamping pump station motors leads to high energy consumption.
The hydraulic systems for lifting and clamping the mold are integrated into a single hydraulic system, driven by a set of pump station motors. The control system precisely controls the clamping and lifting actions, and the pressure management of the accumulator reduces the frequency of pump station motor starts.
This effectively reduces energy consumption during mold replacement, improves the system's energy-saving performance, and further reduces energy loss through the accumulator's pressure replenishment mechanism.
Smart Images
Figure CN116717512B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of stamping equipment control technology, and in particular to an energy-saving die-changing system for a press. Background Technology
[0002] Currently, mold changing mechanisms on presses are mainly divided into mold lifting devices and mold clamping devices. The mold lifting device consists of an oil tank, a pump station motor, a solenoid valve, and a mold lifting actuator. When the mold needs to be lifted, the pump station motor and solenoid valve activate, driving the mold lifting actuator to lift the mold. When the mold needs to be lowered, the pump station motor and solenoid valve again activate to return oil from the oil circuit to the oil tank, allowing the mold to fall. The mold clamping device operates on a similar principle to the mold lifting device, consisting of an oil tank, a pump station motor, a solenoid valve, and a mold clamping actuator. When the mold needs to be released, the pump station motor and solenoid valve activate, driving the mold clamping mechanism to release the mold. When the mold needs to be clamped, the pump station motor again activates, driving the mold clamping mechanism to clamp the mold. Therefore, during mold lifting, lowering, releasing, clamping, and daily production, the mold lifting and clamping pump motors need to be started frequently, consuming a significant amount of energy. Summary of the Invention
[0003] To address the shortcomings of existing technologies, this invention provides an energy-saving mold-changing system for presses, which not only effectively reduces energy consumption during mold lifting and clamping processes, but also features a simple structure and convenient installation.
[0004] The objective of this invention is achieved as follows: An energy-saving mold-changing system for a press includes a hydraulic system and a control system. The hydraulic system includes an oil tank, on which a drive motor is mounted. The drive motor is connected to a hydraulic pump station via a rotating shaft. The oil outlet of the hydraulic pump station is connected to three oil outlet branches: branch one, branch two, and branch three. Branch one is connected to an accumulator. Branch two is connected to an accumulator via a check valve, a pressure boosting valve, and a three-position three-way solenoid valve. Branch three is connected to the accumulator via a two-position three-way solenoid valve and a three-position three-way solenoid valve. An accumulator is equipped with a pressure sensor, and the accumulator is equipped with a pressure sensor. The accumulator is connected to the rod chamber of the mold clamping actuator and the mold lifting actuator, respectively. The rod-side chambers of the clamping mechanism are connected. The accumulator one is connected to the rodless chamber of the clamping mechanism via the three-position three-way solenoid valve two. The rodless chamber of the clamping mechanism is connected to the accumulator two via the three-position three-way solenoid valve one and the three-position three-way solenoid valve three in sequence. The rodless chamber of the clamping mechanism is connected to the accumulator two via the three-position three-way solenoid valve two and the three-position three-way solenoid valve three in sequence. The pressure setpoint of the accumulator one is higher than the pressure setpoint of the accumulator two. The control system includes a controller. The controller collects the pressure values and input signals from the pressure sensor one and the pressure sensor two, and controls the two-position three-way solenoid valve, the three-position three-way solenoid valve one, the three-position three-way solenoid valve two, the three-position three-way solenoid valve three and the drive motor to operate.
[0005] The energy-saving mold changing system for presses of the present invention integrates the hydraulic system for lifting and clamping molds into a single hydraulic system, driven by a set of pump station motors. It has a simple structure, is easy to install, and reduces costs. Furthermore, the entire process of clamping and lifting molds is controlled by a control system, which effectively reduces energy consumption during the lifting and clamping process and saves energy.
[0006] As a further improvement of the present invention, the clamping actuator is equipped with clamping position detection and loosening position detection, and the lifting actuator is equipped with lifting position detection and lowering position detection. The clamping position detection, loosening position detection, lifting position detection and lowering position detection are all connected to the controller, which facilitates the controller to accurately control the entire process of clamping and lifting the mold.
[0007] As a further improvement of this invention, during the first operation, the controller starts the drive motor, energizes the two-position three-way solenoid coil, and energizes coil B of the three-position three-way solenoid valve to fill accumulator one and accumulator two with oil. The controller also collects the current pressure values of accumulator one and accumulator two through pressure sensors one and two. When the pressure value of accumulator two reaches the set value, the controller de-energizes the two-position three-way solenoid valve coil and coil B of the three-position three-way solenoid valve. When the pressure value of accumulator one reaches the set value, the controller stops the drive motor. In other words, the initial energy for the entire system is provided by controlling the drive motor; the entire process is simple to control and energy-efficient.
[0008] As a further improvement of the present invention, when changing the mold, the controller energizes coil B of the three-position three-way solenoid valve and coil A of the three-position three-way solenoid valve, connecting the rod-side chamber of the clamping mechanism to accumulator one. The rodless chamber of the clamping mechanism is connected to accumulator two via three-position three-way solenoid valve one and three-position three-way solenoid valve three in sequence, causing the clamping mechanism to release the mold. When the controller receives a release-to-position detection feedback signal, it de-energizes coil B of the three-position three-way solenoid valve one and coil A of the three-position three-way solenoid valve three, and energizes coil A of the three-position three-way solenoid valve two, connecting the rod-side chamber of the lifting mechanism to accumulator one. The rodless chamber of the lifting mechanism is connected to accumulator one via three-position three-way solenoid valve two, causing the lifting mechanism to lift the mold. When the controller receives a lift-to-position detection feedback signal, it de-energizes coil A of the three-position three-way solenoid valve two, keeping the mold in place. In the lifted state; after the mold is changed, the controller energizes coil B of the three-position three-way solenoid valve and coil A of the three-position three-way solenoid valve, so that the rodless chamber of the mold lifting actuator is connected to accumulator two through the three-position three-way solenoid valves two and three in sequence, and the rod chamber of the mold lifting actuator is connected to accumulator one, and the mold lifting actuator lowers the mold; when the controller receives the feedback signal of the lowered position detection, it de-energizes coil B of the three-position three-way solenoid valve and coil A of the three-position three-way solenoid valve, and energizes coil A of the three-position three-way solenoid valve one, so that the rod chamber of the mold clamping actuator is connected to accumulator one, and the rodless chamber of the mold clamping actuator is connected to accumulator one through the three-position three-way solenoid valve one, and the mold clamping actuator clamps the mold; when the controller receives the feedback signal of the clamping position detection, it de-energizes coil A of the three-position three-way solenoid valve one, and the mold remains clamped. Throughout the mold changing process, the second accumulator experiences almost no pressure loss, and when the mold lifting mechanism performs the lowering action, the returned oil first replenishes the second accumulator, making the system highly efficient and energy-saving.
[0009] As a further improvement of the present invention, when the ratio of the pressure value of accumulator two to the pressure value of accumulator one is greater than the pressure boosting ratio of the boosting valve, the controller energizes coil B of the three-position three-way solenoid valve three. Accumulator two is then connected to accumulator one sequentially through the three-position three-way solenoid valve three, the boosting valve, and the one-way valve two, allowing pressurized oil to flow from accumulator two into accumulator one. That is, after multiple mold changes, accumulator one loses pressure, while accumulator two is continuously pressurized with oil. When the pressure increases, the boosting valve can be used to pressurize oil into accumulator one, thereby reducing the pressure value of accumulator two, increasing the pressure value of accumulator one, and reducing the energy loss of the entire system.
[0010] As a further improvement of the present invention, when the current pressure of accumulator one drops to a set limit, the controller controls the drive motor to start to replenish the pressure value of accumulator one. When the pressure value of accumulator one reaches the set value, the controller controls the motor to stop. When the current pressure of accumulator two drops to a set limit, the controller controls the coil A of the two-position three-way solenoid valve and the three-position three-way solenoid valve to be energized. Accumulator one is connected to accumulator two in sequence through the two-position three-way solenoid valve and the three-position three-way solenoid valve to replenish the pressure value of accumulator two. When the pressure value of accumulator two reaches the set value, the controller controls the coil A of the two-position three-way solenoid valve and the three-position three-way solenoid valve to be de-energized, ensuring the reliable operation of the entire system.
[0011] As a further improvement of the present invention, the oil outlet of the hydraulic pump station is connected to a high-pressure hose, and the other end of the high-pressure hose is connected to a relief valve in sequence through a check valve and a filter. Oil outlet branch one, oil outlet branch two and oil outlet branch three are connected to the relief valve to ensure the reliability of the entire system operation.
[0012] As a further improvement of the present invention, a liquid level detection device is provided on the oil tank, which is connected to the controller to improve the reliability of system operation.
[0013] As a further improvement of the present invention, the control system also includes a touch screen, which is connected to the controller via a communication cable. The controller transmits the collected pressure information to the touch screen, so that the operator can understand the system operation status in real time and control it conveniently. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the hydraulic system of the energy-saving mold changing system for the press of the present invention.
[0015] Figure 2 This is a schematic block diagram of the control system of the energy-saving mold changing system for the press of the present invention. Detailed Implementation
[0016] like Figure 1-2 As shown, the energy-saving mold changing system for presses of the present invention includes a hydraulic system and a control system.
[0017] like Figure 1As shown, the hydraulic system includes an oil tank 17, on which a drive motor 1 is mounted. The drive motor 1 is connected to a hydraulic pump station 2 via a rotating shaft. The oil outlet of the hydraulic pump station 2 is connected to a high-pressure hose 3. The other end of the high-pressure hose 3 is connected to a relief valve 6 via a check valve 4 and a filter 5. The other end of the relief valve 6 is connected to an oil outlet branch 1, an oil outlet branch 2, and an oil outlet branch 3. The oil outlet branch 1 is connected to an accumulator 7, which is connected to a pressure sensor 8. The oil outlet branch 2 is connected to an accumulator 14 via a check valve 23, a booster valve 24, and a three-position three-way solenoid valve 13. The oil outlet branch 3 is connected to an accumulator 14 via a two-position three-way solenoid valve 18 and a three-position three-way solenoid valve 13. The accumulator 14 is connected to a pressure sensor 15. Accumulator 7 is connected to the rod-side chamber of the clamping actuator 10. The rodless chamber of the clamping actuator 10 is connected to accumulator 14 via three-position three-way solenoid valve 9 and three-position three-way solenoid valve 13. Accumulator 7 is connected to the rod-side chamber of the lifting actuator 11 and to the rodless chamber of the lifting actuator 11 via three-position three-way solenoid valve 12. The rodless chamber of the lifting actuator 11 is connected to accumulator 14 via three-position three-way solenoid valve 12 and three-position three-way solenoid valve 13. The pressure setpoint of accumulator 7 is higher than the pressure setpoint of accumulator 14.
[0018] The control system includes a controller 26 and a touch screen 25. The touch screen 25 is connected to the controller 26 via a communication cable. The controller 26 collects the pressure values and input signals from pressure sensor 18 and pressure sensor 25, controls the operation of two-position three-way solenoid valve 18, three-position three-way solenoid valve 19, three-position three-way solenoid valve 212, three-position three-way solenoid valve 313 and drive motor 1, and transmits the collected pressure information to the touch screen 25.
[0019] The oil tank 17 is equipped with a liquid level detection device 16. The clamping actuator 10 is equipped with a clamping position detection 19 and a loosening position detection 20, and the lifting actuator 11 is equipped with a lifting position detection 21 and a lowering position detection 22. The liquid level detection device 16, clamping position detection 19, loosening position detection 20, lifting position detection 21, and lowering position detection 22 are all connected to the controller 26.
[0020] In this embodiment of the energy-saving mold-changing system for the press, the oil pressure setting value of accumulator 17 is greater than that of accumulator 24. During the first operation, controller 26 starts drive motor 1, accumulator 17 fills with oil, the coil of two-position three-way solenoid valve 18 is energized, the coil B of three-position three-way solenoid valve 13 is energized, accumulator 24 fills with oil, and the current pressure value of accumulator 17 is collected by pressure sensor 8 connected to accumulator 17, and the current pressure value of accumulator 214 is collected by pressure sensor 215 connected to accumulator 214. When the pressure value of accumulator 214 reaches the set value, the coils of two-position three-way solenoid valve 18 and three-position three-way solenoid valve 13 are de-energized, and when the pressure value of accumulator 17 reaches the set value, drive motor 1 stops operating.
[0021] When changing the mold, the controller 26 energizes coil B of the three-position three-way solenoid valve 9 and coil A of the three-position three-way solenoid valve 13. The rod-side chamber of the mold clamping actuator 10 is connected to accumulator 7, and the rodless chamber of the mold clamping actuator 10 is connected to accumulator 14 via three-position three-way solenoid valve 9 and three-position three-way solenoid valve 13. Because the pressure value of accumulator 7 is greater than that of accumulator 14, it pushes the piston rod of the mold clamping actuator 10 to move towards the rodless chamber, forcing the oil in the rodless chamber into accumulator 14, thus releasing the mold. When the release-position detection 20 receives a signal, coil B of the three-position three-way solenoid valve 19 and coil A of the three-position three-way solenoid valve 13 are de-energized. Then, coil A of the three-position three-way solenoid valve 212 is energized. The rod chamber of the mold lifting actuator 11 is connected to accumulator 7, and the rodless chamber of the mold lifting actuator 11 is connected to accumulator 7 through the three-position three-way solenoid valve 212. At this time, the oil pressure in the rod chamber and the rodless chamber of the mold lifting actuator 11 is equal, but the force-bearing area of the rodless chamber is larger than that of the rod chamber. Therefore, a pressure difference is formed between the rodless chamber and the rod chamber of the mold lifting actuator 11, which pushes the piston rod in the mold lifting actuator 11 to move towards the rod chamber, lifting the mold. After the release-position detection 21 receives a signal, coil A of the three-position three-way solenoid valve 212 is de-energized, and the mold remains in the lifted state to facilitate mold replacement.
[0022] After the mold is changed, coil B of three-position three-way solenoid valve 12 is energized, and coil A of three-position three-way solenoid valve 13 is energized. The rodless chamber of the mold lifting actuator 11 is connected to accumulator 14 via three-position three-way solenoid valve 12 and three-position three-way solenoid valve 13 in sequence. The rod chamber of the mold lifting actuator 11 is connected to accumulator 7. Therefore, the oil pressure in the rod chamber of the mold lifting actuator 11 is greater than the oil pressure in the rodless chamber, which pushes the piston rod of the mold lifting actuator 11 to move towards the rodless chamber, and pressurizes the oil in the rodless chamber into accumulator 14, causing the mold to fall. After the drop-in detection 22 receives a signal, coil B of three-position three-way solenoid valve 2 (12) and coil A of three-position three-way solenoid valve 3 (13) are de-energized, while coil A of three-position three-way solenoid valve 1 (9) is energized. The rod chamber of the clamping actuator 10 is connected to accumulator 1, and the rodless chamber of the clamping actuator 10 is connected to accumulator 7 through three-position three-way solenoid valve 1 (9). At this time, the oil pressure in the rod chamber and rodless chamber of the clamping actuator 10 is equal, but the force-bearing area of the rodless chamber is larger than that of the rod chamber. Therefore, a pressure difference is formed between the rodless chamber and the rod chamber of the clamping actuator 10, pushing the piston rod in the clamping actuator 10 to move towards the rod chamber, clamping the mold. After the clamping in place detection 19 receives a signal, coil A of three-position three-way solenoid valve 1 (9) is de-energized, and the mold remains clamped.
[0023] After multiple mold changes, accumulator 17 loses pressure, while accumulator 24 is continuously pressurized with oil, causing its pressure to rise. Controller 26 simultaneously collects the current pressure values of accumulator 17 and accumulator 24 and calculates the difference between them. When the ratio of the pressure value of accumulator 24 to the pressure value of accumulator 17 is greater than the pressure increase ratio of booster valve 24, controller 26 energizes coil B of three-position three-way solenoid valve 313. Accumulator 24 is then connected to accumulator 17 sequentially through three-position three-way solenoid valve 313, booster valve 24, and check valve 23. Since the pressure ratio of accumulator 24 to accumulator 17 is greater than the pressure increase ratio of booster valve 24, the oil pressure in accumulator 24, after being boosted by booster valve 24, is greater than the oil pressure in accumulator 17. Therefore, pressurized oil flows from accumulator 24 into accumulator 17, reducing the pressure value of accumulator 24 and increasing the pressure value of accumulator 17.
[0024] To further ensure the stability of the mold changing system, when the current pressure of accumulator 17 drops to a set limit, controller 26 controls drive motor 1 to start, replenishing the pressure value of accumulator 17. When the pressure value of accumulator 17 reaches the set value, drive motor 1 stops. When the current pressure of accumulator 24 drops to a set limit, controller 26 controls drive motor 1 to start, energizing coil B of two-position three-way solenoid valve 18 and three-position three-way solenoid valve 313. Accumulator 17 is connected to accumulator 24 sequentially through two-position three-way solenoid valve 18 and three-position three-way solenoid valve 313, replenishing the pressure value of accumulator 24. When the pressure value of accumulator 24 reaches the set value, coil B of two-position three-way solenoid valve 18 and three-position three-way solenoid valve 313 is de-energized.
[0025] The energy-saving mold-changing system for the press in this embodiment has the following advantages:
[0026] (1) The hydraulic system for lifting the mold and the hydraulic system for clamping the mold in the press mold replacement are integrated into one hydraulic system, which only requires one pump station motor. Compared with the previous hydraulic system for lifting the mold and the hydraulic system for clamping the mold, which required two pump station motors, one pump station motor is saved.
[0027] (2) In the energy-saving mold changing device of the press of the present invention, the function of the pump station motor is to supplement the pressure of accumulator one and accumulator two. During the mold changing process, the power source is accumulator one and accumulator two. Therefore, the pump station motor does not need to operate frequently, saving more energy.
[0028] (3) Except for the initial pressure replenishment, the second accumulator loses almost no pressure. When the lifting mechanism performs the falling action, the returned oil will first replenish the second accumulator. When the pressure value of the second accumulator is greater than the pressure ratio of the first accumulator, the pressure oil will be forced into the first accumulator through the pressure valve to replenish the pressure loss of the first accumulator, further reducing energy loss.
[0029] This invention is not limited to the above embodiments. Based on the technical solutions disclosed in this invention, those skilled in the art can make some substitutions and modifications to some of the technical features without creative effort, and all such substitutions and modifications are within the protection scope of this invention.
Claims
1. An energy-saving die-changing system for a press, characterized in that: The system includes a hydraulic system and a control system. The hydraulic system includes an oil tank with a drive motor mounted on it. The drive motor is connected to a hydraulic pump station via a rotating shaft. The hydraulic pump station has three outlet branches: outlet branch one, outlet branch two, and outlet branch three. Outlet branch one is connected to accumulator one. Outlet branch two is connected to accumulator two via a check valve, a pressure boosting valve, and a three-position three-way solenoid valve three. Outlet branch three is connected to accumulator two via a two-position three-way solenoid valve and a three-position three-way solenoid valve three. Accumulator one is equipped with a pressure sensor one, and accumulator two is equipped with a pressure sensor two. Accumulator one is connected to the rod chamber of the clamping mechanism and the lifting mechanism, respectively. The rod-mounted chamber is connected to the accumulator 1, which is connected to the rodless chamber of the mold-lifting actuator via a three-position three-way solenoid valve 2. The rodless chamber of the mold-clamping actuator is connected to the accumulator 2 via three-position three-way solenoid valve 1 and three-position three-way solenoid valve 3 in sequence. The rodless chamber of the mold-lifting actuator is connected to the accumulator 2 via three-position three-way solenoid valve 2 and three-position three-way solenoid valve 3 in sequence. The pressure setpoint of the accumulator 1 is higher than the pressure setpoint of the accumulator 2. The control system includes a controller, which collects the pressure values and input signals from pressure sensor 1 and pressure sensor 2, and controls the operation of the two-position three-way solenoid valve, the three-position three-way solenoid valve 1, the three-position three-way solenoid valve 2, the three-position three-way solenoid valve 3, and the drive motor.
2. The energy-saving mold changing system for a press according to claim 1, characterized in that: The clamping actuator is equipped with clamping position detection and loosening position detection, and the lifting actuator is equipped with lifting position detection and lowering position detection. The clamping position detection, loosening position detection, lifting position detection, and lowering position detection are all connected to the controller.
3. The energy-saving mold changing system for a press according to claim 2, characterized in that: During the first operation, the controller starts the drive motor, energizes the two-position three-way solenoid coil and the three-position three-way solenoid valve coil B, and fills accumulators one and two with oil. The controller also collects the current pressure values of accumulators one and two through pressure sensors one and two. When the pressure value of accumulator two reaches the set value, the controller de-energizes the two-position three-way solenoid valve coil and the three-position three-way solenoid valve coil B. When the pressure value of accumulator one reaches the set value, the controller stops the drive motor.
4. The energy-saving mold changing system for a press according to claim 3, characterized in that: When changing the mold, the controller energizes coil B of the three-position three-way solenoid valve and coil A of the three-position three-way solenoid valve, connecting the rod-side chamber of the mold clamping mechanism to accumulator one. The rodless chamber of the mold clamping mechanism is connected to accumulator two via three-position three-way solenoid valve one and three-position three-way solenoid valve three, causing the mold clamping mechanism to release the mold. When the controller receives a release-to-position detection feedback signal, it de-energizes coil B of the three-position three-way solenoid valve one and coil A of the three-position three-way solenoid valve three, and energizes coil A of the three-position three-way solenoid valve two, connecting the rod-side chamber of the mold lifting mechanism to accumulator one. The rodless chamber of the mold lifting mechanism is connected to accumulator one via three-position three-way solenoid valve two, causing the mold lifting mechanism to lift the mold. When the controller receives a lift-to-position detection feedback signal, it de-energizes coil A of the three-position three-way solenoid valve two, keeping the mold in the lifted state. After the mold is replaced, the controller energizes coil B of the three-position three-way solenoid valve and coil A of the three-position three-way solenoid valve, causing the rodless chamber of the mold lifting actuator to connect to accumulator two via three-position three-way solenoid valves two and three, and the rod chamber of the mold lifting actuator to connect to accumulator one, thus lowering the mold. When the controller receives a feedback signal indicating that the mold has reached its final position, it de-energizes coils B and A of the three-position three-way solenoid valve and energizes coil A of the three-position three-way solenoid valve, causing the rod chamber of the mold clamping actuator to connect to accumulator one, and the rodless chamber of the mold clamping actuator to connect to accumulator one via three-position three-way solenoid valve one, thus clamping the mold. When the controller receives a feedback signal indicating that the mold has reached its final position, it de-energizes coil A of the three-position three-way solenoid valve one, thus keeping the mold clamped.
5. The energy-saving mold changing system for a press according to claim 4, characterized in that: When the pressure ratio of accumulator two to accumulator one is greater than the pressure ratio of the booster valve, the controller controls the coil B of the three-position three-way solenoid valve three to be energized. Accumulator two is connected to accumulator one in sequence through the three-position three-way solenoid valve three, the booster valve, and the one-way valve two, so that the pressurized oil flows from accumulator two into accumulator one.
6. The energy-saving die-changing system for a press according to claim 5, characterized in that: When the current pressure of accumulator one drops to a set limit, the controller controls the drive motor to start, replenishing the pressure value of accumulator one. When the pressure value of accumulator one reaches the set value, the controller controls the motor to stop. When the current pressure of accumulator two drops to a set limit, the controller controls the coil A of the two-position three-way solenoid valve and the three-position three-way solenoid valve to be energized. Accumulator one is connected to accumulator two in sequence through the two-position three-way solenoid valve and the three-position three-way solenoid valve to replenish the pressure value of accumulator two. When the pressure value of accumulator two reaches the set value, the controller controls the coil A of the two-position three-way solenoid valve and the three-position three-way solenoid valve to be de-energized.
7. The energy-saving die-changing system for a press according to any one of claims 1-6, characterized in that: The oil outlet of the hydraulic pump station is connected to a high-pressure hose, and the other end of the high-pressure hose is connected to a relief valve in sequence through a check valve, a filter, and an oil outlet branch. The first, second, and third oil outlet branches are connected to the relief valve.
8. The energy-saving die-changing system for a press according to any one of claims 1-6, characterized in that: The oil tank is equipped with a liquid level detection device, which is connected to the controller.
9. The energy-saving die-changing system for a press according to any one of claims 1-6, characterized in that: The control system also includes a touch screen, which is connected to the controller via a communication cable. The controller transmits the collected pressure information to the touch screen.
Citation Information
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