Energy-saving high-speed press hydraulic system

Abstract

The utility model discloses an energy-saving high-speed press hydraulic system, and belongs to the technical field of hydraulic systems. Aiming at the problems of low punching speed and high energy consumption of a traditional press hydraulic system, the system provides an energy-saving and efficient scheme integrating servo motor driving, a bag type energy accumulator and multi-stage valve control. The core of the hydraulic system comprises a vertical pushing and lifting oil cylinder, a hydraulic oil pump driven by a servo motor, a Y-shaped meso-position function electro-hydraulic reversing valve, an H-shaped electromagnetic reversing valve, a bag type energy accumulator and an electric valve, wherein the bag type energy accumulator and the electric valve are connected through a bridge type oil pipe. According to the system, energy is stored in the piston rod recovery stage through the energy accumulator, oil is supplied cooperatively with the hydraulic pump during stamping, and high-flow output under low power is achieved. In addition, the safety and the stability of system operation are guaranteed through multi-stage safety valves, pressure sensors and oil filtering / cooling devices on the main oil pipe and the branch oil pipes. According to the design, the punching speed is remarkably increased, energy consumption is reduced, and the device is suitable for intermittent high-speed punching scenes and has high efficiency and energy saving performance.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system technology, specifically to an energy-saving high-speed press hydraulic system. Background Technology

[0002] Energy-saving high-speed press hydraulic systems, as an advanced hydraulic transmission device, are widely used in industrial automation and machinery manufacturing. They are typically adopted due to the need to meet the demands of high-speed, high-efficiency, and low-energy-consumption production. However, traditional press hydraulic systems have some significant drawbacks in practical applications.

[0003] First, the stamping speed of traditional hydraulic systems is often limited by the performance of hydraulic pumps and valves, making it difficult to achieve high-speed stamping and thus affecting production efficiency. Second, traditional hydraulic systems consume a lot of energy during operation, especially under high flow conditions, where energy loss is more significant. This not only increases production costs but also places an unnecessary burden on the environment. To solve the above problems, this utility model proposes an energy-saving high-speed press hydraulic system. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides an energy-saving high-speed press hydraulic system, which has the advantages of faster stamping speed and low power consumption with large flow rate, thus solving the problems of slow stamping speed and high energy consumption in traditional hydraulic systems.

[0006] (II) Technical Solution

[0007] To achieve the aforementioned goal of faster stamping speed and high flow rate with low power, this utility model provides the following technical solution:

[0008] An energy-saving high-speed press hydraulic system includes:

[0009] A vertically upward-mounted lifting cylinder with a movable piston rod inside;

[0010] The hydraulic oil pump is driven by a servo motor at its input end and connected to the main oil pipe at its output end.

[0011] The electro-hydraulic directional valve is a three-position four-way valve with a Y-shaped structure in the neutral position. In the neutral position, the working oil port A1, working oil port B1, and return oil port T1 are interconnected. The oil inlet P1 is connected to the main oil pipe, the working oil port A1 is connected to the rodless chamber of the lifting cylinder, the working oil port B1 is connected to the rod chamber of the lifting cylinder, and the return oil port T1 is connected to the oil tank through the return oil pipe.

[0012] A bladder accumulator is connected to the main oil pipe via a branch oil pipe. A first check valve is installed on the branch oil pipe, and its conduction direction is from the main oil pipe to the bladder accumulator.

[0013] An electromagnetic directional valve is connected in parallel between the return oil pipe and the branch oil pipe;

[0014] A bridge-type oil pipe, one end of which is connected to the return oil pipe, and the other end is connected to the branch oil pipe section between the bladder accumulator and the first check valve.

[0015] An electric valve, installed on the bridge-type oil pipe, is used to control the release of oil from the bladder accumulator.

[0016] The preferred technical solution of this utility model is that the electromagnetic reversing valve is a three-position four-way valve, the middle position function adopts an H-type structure, its working oil port A2 is connected to the branch oil pipe, the oil inlet P2 is connected to the main oil pipe, the oil return port T2 is connected to the return oil pipe, and the working oil port B2 is closed.

[0017] The preferred technical solution of this utility model is that a second check valve and a first safety valve are sequentially provided on the main oil pipe, the pressure relief end of the first safety valve is connected to the oil tank, and the opening direction of the second check valve is from the hydraulic oil pump to the first safety valve.

[0018] A preferred embodiment of this invention is that a second safety valve is provided on the branch oil pipe, and its installation position is located between the first check valve and the bladder accumulator. The pressure relief end of the second safety valve is connected to the return oil pipe, and its set pressure value is higher than the set pressure value of the first safety valve.

[0019] A preferred embodiment of this invention is that a first pressure sensor is provided at the first safety valve on the main oil pipe, and a second pressure sensor is provided at the second safety valve on the branch oil pipe.

[0020] The preferred technical solution of this utility model is that the oil suction port of the hydraulic oil pump is provided with an oil suction filter, and the oil discharge port of the oil return pipe is provided with an oil return filter.

[0021] The preferred technical solution of this utility model is that an air cooler is connected in series on the oil return pipe, and the heat dissipation power of the air cooler is matched with the maximum oil return flow of the system.

[0022] (III) Beneficial Effects

[0023] Compared with the prior art, this utility model provides an energy-saving high-speed press hydraulic system, which has the following beneficial effects:

[0024] This energy-saving high-speed press hydraulic system uses a servo motor to drive the hydraulic oil pump, and combines the synergistic effects of electro-hydraulic directional valves, solenoid directional valves, electric valves and bladder accumulators to achieve a significant increase in stamping speed. This effectively solves the problem of slow stamping speed in traditional hydraulic systems and improves production efficiency.

[0025] This energy-saving high-speed press hydraulic system ensures safe and stable operation by setting up multi-stage safety valves and pressure sensors, as well as air coolers and oil filters on the return oil pipe. At the same time, it reduces energy consumption and achieves the goal of low power and high flow rate, which is of positive significance for environmental protection and production cost control. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structural principle of this utility model;

[0027] In the diagram: 1. Lifting cylinder; 2. Hydraulic pump; 3. Servo motor; 4. Main oil pipe; 5. Return oil pipe; 6. Branch oil pipe; 7. Bridge-type oil pipe; 8. Electro-hydraulic directional valve; 9. Solenoid directional valve; 10. Electric valve; 11. Bladder accumulator; 12. Oil tank; 13. First check valve; 14. Second check valve; 15. First safety valve; 16. Second safety valve; 17. First pressure sensor; 18. Second pressure sensor; 19. Suction oil filter; 20. Return oil filter; 21. Air cooler. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Please see Figure 1 An energy-saving high-speed press hydraulic system includes:

[0032] The vertically upward-mounted lifting cylinder 1 has a piston rod that moves inside.

[0033] Hydraulic oil pump 2, whose input end is driven by servo motor 3 and whose output end is connected to main oil pipe 4;

[0034] The electro-hydraulic directional valve 8 is a three-position four-way valve with a Y-shaped structure in the neutral position. In the neutral position, the working oil port A1, working oil port B1 and return oil port T1 are interconnected. The oil inlet P1 is connected to the main oil pipe 4, the working oil port A1 is connected to the rodless chamber of the lifting cylinder 1, the working oil port B1 is connected to the rod chamber of the lifting cylinder 1, and the return oil port T1 is connected to the oil tank 12 through the return oil pipe 5.

[0035] The bladder accumulator 11 is connected to the main oil pipe 4 via the branch oil pipe 6. The branch oil pipe 6 is equipped with a first check valve 13, which is directed from the main oil pipe 4 to the bladder accumulator 11.

[0036] The electromagnetic reversing valve 9 is connected in parallel between the return oil pipe 5 and the branch oil pipe 6;

[0037] Bridge-type oil pipe 7, one end of which is connected to return oil pipe 5, and the other end is connected to branch oil pipe 6 between bladder accumulator 11 and first check valve 13;

[0038] An electric valve 10, installed on the bridge-type oil pipe 7, is used to control the oil release from the bladder accumulator 11.

[0039] It should be noted that during the upward lifting process, the piston rod in the lifting cylinder 1 of this device is powered by the hydraulic pump 2 and the bladder accumulator 11, which can quickly lift it and provide a large flow of pressure. When the pressure is completed, the electro-hydraulic directional valve 8 switches to the neutral position, and the piston rod retracts under the action of gravity. At the same time, the bladder accumulator 11 stores energy during the gap when the piston rod retracts, in preparation for the next pressure lifting operation.

[0040] In this embodiment, the electromagnetic reversing valve 9 is a three-position four-way valve. Its middle position function adopts an H-type structure. Its working oil port A2 is connected to the branch oil pipe 6, the oil inlet P2 is connected to the main oil pipe 4, the oil return port T2 is connected to the oil return pipe 5, and the working oil port B2 is closed.

[0041] It should be noted that the neutral position of the electromagnetic directional valve 9 serves as the "neutral" position of the system, i.e., the standby state. At this time, since the neutral position function adopts an H-type structure, the oil flow direction is hydraulic oil pump 2 - oil inlet P2 - oil return T2 - oil tank 12.

[0042] In some embodiments, a second check valve 14 and a first safety valve 15 are sequentially provided on the main oil pipe 4. The pressure relief end of the first safety valve 15 is connected to the oil tank 12. The opening direction of the second check valve 14 is from the hydraulic oil pump 2 to the first safety valve 15. A second safety valve 16 is provided on the branch oil pipe 6. Its installation position is between the first check valve 13 and the bladder accumulator 11. The pressure relief end of the second safety valve 16 is connected to the return oil pipe 5. Its set pressure value is higher than the set pressure value of the first safety valve 15. A first pressure sensor 17 is provided on the main oil pipe 4 at the first safety valve 15. A second pressure sensor 18 is provided on the branch oil pipe 6 at the second safety valve 16.

[0043] It should be noted that the aforementioned safety valves and sensors together constitute multiple safety safeguards for the system. The set pressure values ​​of the first safety valve 15 and the second safety valve 16 are different, which can be flexibly adjusted according to the actual working pressure to ensure that the system operates within a safe range. At the same time, the setting of the first pressure sensor 17 and the second pressure sensor 18 can monitor the pressure changes of the system in real time, providing data support for system fault diagnosis and precise control.

[0044] In this embodiment, the suction port of the hydraulic oil pump 2 is equipped with a suction filter 19, and the discharge port of the return oil pipe 5 is equipped with a return oil filter 20.

[0045] It should be noted that these two oil filters can effectively filter out impurities and particulate matter in the oil, maintain the cleanliness of the oil, extend the service life of the system, and reduce system failures caused by oil contamination.

[0046] In this embodiment, an air cooler 21 is connected in series on the oil return pipe 5, and the heat dissipation power of the air cooler 21 is matched with the maximum oil return flow rate of the system.

[0047] It should be noted that the air cooler 21 ensures that the oil is sufficiently cooled before flowing back to the oil tank 12, reducing the system temperature and improving system stability and service life. At the same time, the air cooler 21 also reduces system malfunctions and safety hazards caused by oil overheating.

[0048] In summary, this energy-saving high-speed press hydraulic system, through the servo motor 3 driving the hydraulic oil pump 2, combined with the synergistic effect of the electro-hydraulic directional valve 8, the solenoid directional valve 9, the electric valve 10 and the bladder accumulator 11, achieves a significant increase in stamping speed, effectively solves the problem of slow stamping speed in traditional hydraulic systems, and improves production efficiency.

[0049] This energy-saving high-speed press hydraulic system ensures safe and stable operation of the system by setting up multi-stage safety valves and pressure sensors, as well as air cooler 21 and oil filter on the return oil pipe 5. At the same time, it reduces energy consumption and achieves the goal of low power and high flow rate, which is of positive significance for environmental protection and production cost control.

[0050] Please see Figure 1 (Electromagnet markings are attached). The specific working principle and possible practical situations are as follows:

[0051] During the initial startup, the bladder accumulator 11 is first energized: the servo motor 3 drives the hydraulic oil pump 2 to supply oil, the DT02 of the solenoid directional valve 9 is energized, the electro-hydraulic directional valve 8 is not energized and is in the neutral position, the electric valve 10 is not energized, and the oil flows sequentially through the second check valve 14 - oil inlet P2 - working oil port A2 - first check valve 13 - bladder accumulator 11; when the pressure reported by the second pressure sensor 18 reaches the energy storage requirement, the system enters standby mode after the bladder accumulator 11 has finished storing energy.

[0052] System standby state: Servo motor 3 drives hydraulic oil pump 2 to deliver oil, electromagnetic directional valve 9 and electro-hydraulic directional valve 8 are both in the neutral position, electric valve 10 is not energized, and the oil flow direction is hydraulic oil pump 2 - oil inlet P2 - oil return T2 - oil tank 12.

[0053] Rapid lifting state: Servo motor 3 drives hydraulic oil pump 2 to deliver oil, electromagnetic directional valve 9 DT01, electric valve 10 DT10 and electro-hydraulic directional valve 8 DT04 are energized. At this time, the oil in bladder accumulator 11 enters the main oil pipe 4 through bridge oil pipe 7 and flows together with the oil in hydraulic oil pump 2 through oil inlet P1-working oil port A1 to reach the rodless chamber of lifting cylinder 1, realizing rapid and large flow lifting of piston rod;

[0054] Automatic recovery state: DT10 of electric valve 10 is de-energized, electro-hydraulic directional valve 8 is de-energized and automatically returns to the neutral position. At this time, A1, B1 and T1 are interconnected, that is, the piston rod will slowly descend and recover due to its own gravity. At the same time, servo motor 3 and DT02 of electromagnetic directional valve 9 are energized to further store energy for bladder accumulator 11.

[0055] The system consists of a rapid lifting state and an automatic retraction state, which constitute one working cycle. The system is suitable for intermittent stamping processes, achieving a low-power, high-flow, and high-efficiency working experience, while also having the advantages of energy saving and consumption reduction.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving type high-speed press hydraulic system, characterized by , comprising: a lifting oil cylinder arranged vertically upward, with a piston rod movably arranged inside; a hydraulic oil pump, with an input end driven by a servo motor and an output end connected to a main oil pipe; an electro-hydraulic reversing valve, a three-position four-way valve with a Y-shaped structure in the neutral position, with working oil port A1, working oil port B1 and return oil port T1 in communication with each other, oil inlet port P1 connected to the main oil pipe, working oil port A1 connected to the rodless chamber of the lifting oil cylinder, working oil port B1 connected to the rod chamber of the lifting oil cylinder, and return oil port T1 connected to the oil tank through a return oil pipe; a bladder accumulator connected to the main oil pipe through a branch oil pipe, with a first check valve arranged on the branch oil pipe, with a conduction direction from the main oil pipe to the bladder accumulator; an electromagnetic reversing valve arranged in parallel between the return oil pipe and the branch oil pipe; a bridge oil pipe, with one end connected to the return oil pipe and the other end connected to the branch oil pipe section between the bladder accumulator and the first check valve; an electric valve arranged on the bridge oil pipe, for controlling the release of oil from the bladder accumulator.

2. The energy-saving hydraulic system of a high-speed press according to claim 1, characterized in that: The electromagnetic reversing valve is a three-position four-way valve, with a H-shaped structure in the neutral position, with working oil port A2 connected to the branch oil pipe, oil inlet port P2 connected to the main oil pipe, return oil port T2 connected to the return oil pipe, and working oil port B2 closed.

3. The energy-saving hydraulic system of a high-speed press according to claim 1, characterized in that: The main oil pipe is sequentially provided with a second check valve and a first safety valve, with the relief end of the first safety valve connected to the oil tank, and the opening direction of the second check valve from the hydraulic oil pump to the first safety valve.

4. The energy-saving type hydraulic system of high-speed press according to claim 3, characterized in that: The branch oil pipe is provided with a second safety valve, with an installation position between the first check valve and the bladder accumulator, with the relief end of the second safety valve connected to the return oil pipe, and with a set pressure value higher than that of the first safety valve.

5. The energy-saving type hydraulic system of high-speed press according to claim 4, characterized in that: The main oil pipe is provided with a first pressure sensor at the first safety valve, and the branch oil pipe is provided with a second pressure sensor at the second safety valve.

6. The energy-saving type hydraulic system of high-speed press according to claim 1, characterized in that: The oil suction port of the hydraulic oil pump is provided with an oil suction filter, and the oil discharge port of the return oil pipe is provided with an oil return filter.

7. The energy-saving hydraulic system of a high-speed press according to claim 1, wherein: The return oil pipe is connected in series with an air cooler, with a heat dissipation power matched with the maximum oil return flow of the system.

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