Multifunctional hydraulic distributor with high-low pressure switching function and working method thereof

Abstract

The invention provides a multifunctional hydraulic distributor with a high-low pressure switching function and a working method of the multifunctional hydraulic distributor, and belongs to the technical field of hydraulic design and transmission. The problems that in the prior art, the test time is greatly prolonged, the test cost is increased, and the oil leakage risk is lowered through a manual switching and distributed original element adding method are solved. The hydraulic system comprises a pressure reducing valve, an energy accumulator, a high-pressure filter, a cartridge valve and a high-low pressure switching block, the pressure reducing valve is connected with an oil inlet, the pressure reducing valve is connected with the energy accumulator, the energy accumulator is connected with the high-pressure filter, the output end of the high-pressure filter is communicated with an oil supply port of a pilot valve, and the cartridge valve controls opening and closing of an oil way through an electromagnetic reversing valve. An upper cavity of the cartridge valve is communicated with the oil drainage port, the left side of the cartridge valve is communicated with the oil outlet, and the high-low pressure switching block is communicated with the oil outlet. The device is mainly used in a hydraulic servo or transmission loop with functional requirements of high-low pressure switching start, cut-off and the like.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic design and transmission technology, and in particular relates to a multifunctional hydraulic distributor with high-low pressure switching and a working method thereof. Background Art

[0002] In complex hydraulic servo motion systems, the system needs to have cut-off functions according to test requirements. Especially in large-flow three-stage valve application projects, it is necessary to provide high-pressure oil supply to the three-stage valve pilot valve and low-pressure debugging of the hydraulic circuit. The conventional method is to manually replace the pipeline, switch the oil circuit, and increase the distribution of control elements in the corresponding parts of the hydraulic circuit to meet the test requirements. However, this method of manual switching and distributed addition of components greatly increases the test time, increases the test cost and the risk of oil leakage. Summary of the invention

[0003] In view of this, the present invention aims to propose a multifunctional hydraulic distributor with high and low pressure switching and a working method thereof, so as to solve the problem in the prior art that the method of manual switching and distributed addition of components greatly increases the test time, increases the test cost and the risk of oil leakage.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A multifunctional hydraulic distributor with high-low pressure switching, comprising a pressure reducing valve, an accumulator, a high-pressure filter, a cartridge valve and a high-low pressure switching block, the pressure reducing valve is connected to an oil inlet, the pressure reducing valve is connected to an accumulator, the accumulator is connected to a high-pressure filter, the output end of the high-pressure filter is connected to an oil supply port of a pilot valve, the cartridge valve controls the opening and closing of an oil circuit through an electromagnetic reversing valve, the upper chamber of the cartridge valve is connected to an oil drain port, the left side is connected to an oil outlet, and the high-low pressure switching block is connected to the oil outlet.

[0006] Furthermore, the high-low pressure switching block includes a high-pressure flow switch valve, a low-pressure flow switch valve, a first high-pressure flow regulating valve, a low-pressure flow regulating valve, a second high-pressure flow regulating valve and a relief valve;

[0007] When the low-pressure flow switch valve solenoid is energized and located in the left position, the high-pressure oil flows through the low-pressure flow regulating valve, the low-pressure flow switch valve and the one-way valve in sequence to reach the oil outlet. The relief valve is arranged on one side of the low-pressure flow switch valve to detect the oil circuit pressure.

[0008] When the high-pressure flow switch valve is energized, the high-pressure oil passes through the high-pressure flow switch valve and is regulated by the first high-pressure flow regulating valve and the second high-pressure flow regulating valve in sequence.

[0009] Furthermore, a high-pressure filter clogging alarm interface is provided at the port of the high-pressure filter.

[0010] Furthermore, a second pressure measuring joint is provided at the outlet end of the oil outlet, and a first pressure measuring joint is provided at the port of the oil supply port of the pilot valve.

[0011] Furthermore, a cartridge valve cover plate is installed above the cartridge valve.

[0012] Furthermore, the solenoid reversing valve, high-pressure flow switch valve and low-pressure flow switch valve are respectively controlled by the computer IO control board through the P1, P2 and P3 ports of the conditioning board DG3, the power supply 24V is provided by pin 2 in the corresponding port, and the control signal is controlled by pin 1 in the corresponding port.

[0013] Furthermore, a pressure sensor is provided at the outlet of the oil outlet.

[0014] Furthermore, the pressure sensor is transmitted by the computer analog acquisition board LC2-1 through the P1 port of the analog conditioning board AG2, the power supply 24V is provided by pin 3 in the port, and the pressure signal is collected by pin 6 in the port.

[0015] Furthermore, the state of the high-voltage filter is collected by the P1 port of the computer IO acquisition board DG2, the power supply 24V is provided by pin 4 in the port, and the signal is collected by pin 3 in the port.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The computer control system realizes the automatic operation of high and low pressure switching of the hydraulic circuit, separate filtering and decompression of the pilot stage, and cut-off function. The traditional technology relies on manual switching of pipelines and oil circuits, which is cumbersome and inefficient. The present invention greatly reduces manual intervention and improves operating efficiency and system reliability through automatic control of components such as solenoid valves and pressure sensors.

[0018] 2. In traditional hydraulic systems, high and low pressure switching and debugging require distributed addition of control elements and manual switching of pipelines, which can easily lead to oil leakage. The present invention integrates key components such as high and low pressure switching blocks, cartridge valves, and pressure reducing valves into a distributor through an integrated design, thereby reducing pipeline connection points and significantly reducing the risk of oil leakage.

[0019] 3. The present invention realizes smooth switching from low pressure to high pressure through the coordinated work of the high-pressure flow switch valve and the low-pressure flow switch valve in the high-low pressure switching block. When starting at low pressure, the system pressure gradually increases, avoiding the impact of directly loading high-pressure oil on the system and extending the service life of hydraulic components.

[0020] 4. The present invention provides a stable low-pressure oil source for the pilot valve through the combination of a pressure reducing valve, an accumulator and a high-pressure filter. The high-pressure filter can effectively filter impurities in the oil to prevent the pilot valve from being blocked, thereby ensuring the stable operation of the pilot valve. At the same time, the accumulator ensures that the pressure of the oil supply to the pilot valve is stable, further improving the stability of the system.

[0021] 5. The present invention monitors the system pressure in real time through a pressure sensor, and displays and determines the threshold through a computer control system to ensure that the system operates within a safe pressure range. In addition, the high-pressure filter blockage alarm interface can detect the filter status in time and send out an alarm signal when the filter element is blocked, prompting the operator to replace the filter element, thereby avoiding system failures caused by filter blockage.

[0022] 6. The present invention realizes the rapid shutoff function of the hydraulic circuit through the combination of the cartridge valve and the electromagnetic reversing valve. When an abnormality occurs in the system, the computer can quickly control the action of the electromagnetic reversing valve, close the cartridge valve, cut off the oil circuit, prevent further damage to the system, and enhance the reliability and safety of the system.

[0023] 7. The hydraulic distributor of the present invention adopts a modular design. Each functional module, such as the high and low pressure switching block, the cartridge valve control module, etc., is relatively independent and easy to disassemble, maintain and upgrade. This design not only reduces the maintenance cost, but also improves the scalability of the system, and can expand functions according to different application requirements.

[0024] 8. During the debugging and testing process of the traditional hydraulic system, it is necessary to frequently replace pipelines and adjust control components, which consumes a lot of time and labor costs. The present invention significantly shortens the test time, reduces the test cost, and improves the test efficiency through automated control and integrated design.

[0025] 9. The present invention is not only suitable for large-flow three-stage valve application projects, but can also be widely used in other hydraulic servo or transmission circuits that require high-low pressure switching, separate pilot stage oil supply and cut-off functions, and has wide applicability and compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a principle diagram of a multifunctional hydraulic distributor with high and low pressure switching according to the present invention;

[0028] Figure 2 Schematic diagram of the distributor structure Figure 1 ;

[0029] Figure 3 Schematic diagram of the distributor structure Figure 2 ;

[0030] Figure 4 The structure diagram of the high and low voltage switching block Figure 1 ;

[0031] Figure 5 The structure diagram of the high and low voltage switching block Figure 2 ;

[0032] Figure 6 The structure diagram of the high and low voltage switching block Figure 3 ;

[0033] Figure 7 This is the electrical schematic diagram of the controlled electromagnetic reversing valve;

[0034] Figure 8 Collect electrical schematics for pressure sensors;

[0035] Fig. 9 Electrical schematic diagram for high pressure filter blockage alarm;

[0036] Fig.10 is the workflow diagram of the distributor;

[0037] In the figure:

[0038] 1-pressure reducing valve, 2-accumulator, 3.1-high-pressure filter, 3.2-high-pressure filter blockage alarm interface, 4.1-first pressure measuring joint, 4.2-second pressure measuring joint, 5-solenoid reversing valve, 6-cartridge valve, 7-cartridge valve cover, 8-high and low pressure switching block, 8.1-high-pressure flow switch valve, 8.2-low-pressure flow switch valve, 9-first high-pressure flow regulating valve, 10.1-low-pressure flow regulating valve, 10.2-second high-pressure flow regulating valve, 11-overflow valve, 12-check valve, 13-pressure sensor, 14-oil inlet, 15-oil outlet, 16-oil drain port, 17-pilot valve oil supply port. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0040] Specific implementation 1: See Figure 1-6To describe this embodiment, a multifunctional hydraulic distributor with high-low pressure switching includes a pressure reducing valve 1, an accumulator 2, a high-pressure filter 3.1, a cartridge valve 6 and a high-low pressure switching block 8, wherein the pressure reducing valve 1 is connected to an oil inlet 14, the pressure reducing valve 1 is connected to the accumulator 2, the accumulator 2 is connected to the high-pressure filter 3.1, the output end of the high-pressure filter 3.1 is connected to an oil supply port 17 of a pilot valve, the cartridge valve 6 controls the opening and closing of an oil circuit through an electromagnetic reversing valve 5, the upper chamber of the cartridge valve 6 is connected to an oil drain port 16, the left side is connected to an oil outlet 15, and the high-low pressure switching block 8 is connected to the oil outlet 15.

[0041] The high-low pressure switching block 8 includes a high-pressure flow switch valve 8.1, a low-pressure flow switch valve 8.2, a first high-pressure flow regulating valve 9, a low-pressure flow regulating valve 10.1, a second high-pressure flow regulating valve 10.2 and a relief valve 11;

[0042] When the solenoid of the low-pressure flow switch valve 8.2 is energized and in the left position, the high-pressure oil flows through the low-pressure flow regulating valve 10.1, the low-pressure flow switch valve 8.2 and the one-way valve 12 in sequence to reach the oil outlet 15. The relief valve 11 is arranged on one side of the low-pressure flow switch valve 8.2 to detect the oil circuit pressure;

[0043] When the high-pressure flow switch valve 8.1 is energized, the high-pressure oil passes through the high-pressure flow switch valve 8.1 and is adjusted by the first high-pressure flow regulating valve 9 and the second high-pressure flow regulating valve 10.2 in sequence.

[0044] A high-pressure filter clogging alarm interface 3.2 is provided at the port of the high-pressure filter 3.1, a second pressure measuring joint 4.2 is provided at the outlet end of the oil outlet 15, a first pressure measuring joint 4.1 is provided at the port of the pilot valve oil supply port 17, a cartridge valve cover plate 7 is installed above the cartridge valve 6, and a pressure sensor 13 is provided at the outlet of the oil outlet 15.

[0045] The motor in the oil source system starts, and the pump draws oil from the oil tank and pressurizes it into high-pressure oil. The high-pressure oil is supplied in three ways in the distributor. The first way is input to the pressure reducing valve 1 to form the supply oil of the pilot valve. At this time, the high-pressure oil is mainly responsible for the servo movement of the transmission system. The pressure is high, so it is reduced by the pressure reducing valve 1 and supplied to the secondary pilot valve. In order to ensure that the pilot valve has sufficient oil and stable pressure, an accumulator 2 is added after the pressure reducing valve 1, and then a high-pressure filter 3.1 is connected in series after the accumulator 2 to filter impurities in the oil to prevent the pilot valve from being blocked. After long-term use, if there are too many impurities in the high-pressure filter, the high-pressure filter will be blocked. The alarm interface 3.2 generates an alarm signal and is transmitted to the computer to prompt the operator to replace the filter element of the high-pressure filter 3.1. The output of the high-pressure filter 3.1 is connected to the pilot valve oil supply port 17 for use by the pilot valve. The first pressure measuring joint 4.1 is used by the operator to test the pressure with an external pressure gauge.

[0046] The second high-pressure oil is delivered to the cartridge valve 6 for the subsequent transmission system's oil to be opened and closed separately. When it is not opened, the electromagnetic reversing valve 5 is located in the right position under the action of the spring force, so that the high-pressure oil flows through the electromagnetic reversing valve 5 and enters the upper chamber of the cartridge valve 6, so that the high-pressure oil on the left side cannot flow through the cartridge valve 6. When the computer controls the electromagnetic reversing valve 5 to be energized, it is located in the left position under the action of the electromagnetic force. At this time, no high-pressure oil flows through the electromagnetic reversing valve 5, so that the cartridge valve 6 opens the cartridge valve 6 under the action of the inherent spring force, and the pressure oil in the upper chamber of the cartridge valve 6 flows back to the oil drain port 16, and the high-pressure oil on the left side flows through the cartridge valve 6 and enters the oil outlet port 15.

[0047] The third high-pressure oil is delivered to the high-low pressure switching block 8. When the electromagnet of the low-pressure flow switch valve 8.2 is energized and located in the left position, the high-pressure oil will be adjusted by the low-pressure flow regulating valve 10.1 to gradually increase the flow rate, flow through the low-pressure flow switch valve 8.2, and then flow through the one-way valve 12 to reach the oil outlet 15. At this time, the pressure of the oil circuit is determined by the pressure threshold set in advance by the overflow valve 11. When the high-pressure flow switch valve 8.1 is energized, the high-pressure oil will pass through the high-pressure flow switch valve 8.1, and be adjusted by the first high-pressure flow regulating valve 9 and the second high-pressure flow regulating valve 10.2. The pressure of the oil outlet 15 will gradually increase to the oil supply pressure of the system, that is, the pressure of the oil inlet 14. Near the oil outlet 15, the operator can test the pressure with an external pressure gauge through the second pressure measuring joint 4.2 or collect the pressure through the pressure sensor 13 and upload it to the computer for display.

[0048] Through the combination of the pressure reducing valve 1, the accumulator 2 and the high-pressure filter 3, a stable low-pressure oil source is provided for the pilot valve. The high-pressure filter can effectively filter impurities in the oil to prevent the pilot valve from being blocked and ensure the stable operation of the pilot valve. At the same time, the accumulator 2 ensures that the pressure of the pilot valve oil supply is stable, further improving the stability of the system. The system pressure is monitored in real time by the pressure sensor 13, and displayed and threshold value judgment is performed through the computer control system to ensure that the system operates within a safe pressure range. In addition, the high-pressure filter blockage alarm interface 3.2 can detect the filter status in time, and send out an alarm signal when the filter element is blocked, prompting the operator to replace the filter element, thereby avoiding system failures caused by filter blockage. Through the combination of the cartridge valve 6 and the electromagnetic reversing valve 5, the rapid cut-off function of the hydraulic circuit is realized. When the system is abnormal, the computer can quickly control the action of the electromagnetic reversing valve 5, close the cartridge valve 6, cut off the oil circuit, prevent further damage to the system, and enhance the reliability and safety of the system.

[0049] Specific implementation method 2: See Figure 7To illustrate this embodiment, the electromagnetic reversing valve 5, the high-pressure flow switch valve 8.1 and the low-pressure flow switch valve 8.2 are respectively controlled by the computer IO control board card through the P1, P2 and P3 ports of the conditioning board DG3, the power supply 24V is provided by the pin 2 in the corresponding port, and the control signal is controlled by the pin 1 in the corresponding port.

[0050] Specific implementation method 3: See Figure 8 To illustrate this embodiment, the pressure sensor 13 is transmitted by the computer analog acquisition board LC2-1 through the P1 port of the analog conditioning board AG2, the power supply 24V is provided by pin 3 in the port, and the pressure signal is collected by pin 6 in the port.

[0051] Specific implementation method 4: See Fig. 9 In this embodiment, the state of the high-pressure filter (3.1) is collected by the P1 port of the computer IO acquisition board DG2, the power supply 24V is provided by pin 4 in the port, and the signal is collected by pin 3 in the port.

[0052] Specific implementation 5: See Fig.10 The present embodiment describes a working method of a multifunctional hydraulic distributor with high and low pressure switching, which comprises the following steps:

[0053] Step 1: First, select the function. When the system is not working, the distributor is in the initial state of process 1, and the electromagnetic reversing valve 5, the high-pressure flow switch valve 8.1 and the low-pressure flow switch valve 8.2 are all in the power-off state. If the system under test does not have the high-low pressure switching requirement, the impact of the direct loading pressure on the system is not considered. A separate opening and closing function can be used, and only the cartridge valve can be started, that is, directly enter process 4 and energize the electromagnetic reversing valve 5;

[0054] Step 2: If the system wants to start without impact, a high-low pressure switch block can be used. Start with low pressure first, that is, the low-pressure flow switch valve 8.2 is energized;

[0055] Step 3: Wait for the set value of the pressure sensor to stabilize at (1±10%)P 低 , the high pressure function can be started, that is, the high pressure flow switch valve 8.1 is energized and the low pressure flow switch valve 8.2 is de-energized. 低 is the setting value of the relief valve 11;

[0056] Step 4: When there is a high or low pressure start-up requirement, wait for the set value of the pressure sensor to stabilize at (1±10%)P 高 , indicating that the pressure has reached the given working pressure value. If there is no high or low pressure startup requirement, the cartridge valve can be opened directly, that is, the solenoid reversing valve 5 is energized, and the high pressure flow switch valve 8.1 is de-energized. Here, P 高 is the pressure value of the oil inlet 14;

[0057] Step 5: At this time, the distributor is started and the servo system is running. During the operation, the computer monitors the value of the pressure sensor (13) and the status of the high-pressure filter blockage alarm interface (3.2) in real time;

[0058] Step 6: After the test is completed, close the distributor so that the electromagnetic reversing valve 5, the high-pressure flow switch valve 8.1, and the low-pressure flow switch valve 8.2 are all in the power-off state.

[0059] The specific embodiments of the present invention disclosed above are only used to help explain the present invention. The specific embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A multifunctional hydraulic distributor with high and low pressure switching, characterized in that: The invention comprises a pressure reducing valve (1), an accumulator (2), a high-pressure filter (3.1), a cartridge valve (6) and a high-low pressure switching block (8), wherein the pressure reducing valve (1) is connected to an oil inlet (14), the pressure reducing valve (1) is connected to an accumulator (2), the accumulator (2) is connected to a high-pressure filter (3.1), the output end of the high-pressure filter (3.1) is connected to an oil supply port (17) of a pilot valve, the cartridge valve (6) controls the opening and closing of an oil circuit through an electromagnetic reversing valve (5), the upper chamber of the cartridge valve (6) is connected to an oil drain port (16), the left side is connected to an oil outlet (15), and the high-low pressure switching block (8) is connected to the oil outlet (15).

2. A multifunctional hydraulic distributor with high and low pressure switching according to claim 1, characterized in that: The high-low pressure switching block (8) comprises a high-pressure flow switch valve (8.1), a low-pressure flow switch valve (8.2), a first high-pressure flow regulating valve (9), a low-pressure flow regulating valve (10.1), a second high-pressure flow regulating valve (10.2) and a relief valve (11); When the electromagnet of the low-pressure flow switch valve (8.2) is energized and is in the left position, the high-pressure oil flows through the low-pressure flow control valve (10.1) in sequence through the low-pressure flow switch valve (8.2) and the one-way valve (12) to reach the oil outlet (15), and the overflow valve (11) is arranged on one side of the low-pressure flow switch valve (8.2) to detect the oil circuit pressure; When the high-pressure flow switch valve (8.1) is energized, the high-pressure oil passes through the high-pressure flow switch valve (8.1) and is adjusted in sequence by the first high-pressure flow regulating valve (9) and the second high-pressure flow regulating valve (10.2).

3. A multifunctional hydraulic distributor with high and low pressure switching according to claim 1, characterized in that: A high-pressure filter blockage alarm interface (3.2) is provided at the port of the high-pressure filter (3.1).

4. The multifunctional hydraulic distributor with high and low pressure switching according to claim 1, characterized in that: A second pressure measuring joint (4.2) is provided at the outlet end of the oil outlet (15), and a first pressure measuring joint (4.1) is provided at the port of the pilot valve oil supply port (17).

5. The multifunctional hydraulic distributor with high and low pressure switching according to claim 1, characterized in that: A cartridge valve cover plate (7) is installed above the cartridge valve (6).

6. The multifunctional hydraulic distributor with high and low pressure switching according to claim 2, characterized in that: The electromagnetic reversing valve (5), the high-pressure flow switch valve (8.1) and the low-pressure flow switch valve (8.2) are respectively controlled by the computer IO control board card via the P1, P2 and P3 ports of the conditioning board DG3, the power supply 24V is provided by the pin 2 in the corresponding port, and the control signal is controlled by the pin 1 in the corresponding port.

7. The multifunctional hydraulic distributor with high and low pressure switching according to claim 1, characterized in that: A pressure sensor (13) is provided at the outlet of the oil outlet (15).

8. The multifunctional hydraulic distributor with high and low pressure switching according to claim 7, characterized in that: The pressure sensor (13) is transmitted by the computer analog acquisition board LC2-1 through the P1 port of the analog conditioning board AG2, the power supply 24V is provided by pin 3 in the port, and the pressure signal is collected by pin 6 in the port.

9. The multifunctional hydraulic distributor with high and low pressure switching according to claim 3, characterized in that: The state of the high-pressure filter (3.1) is collected by the P1 port of the computer IO acquisition board DG2, the power supply 24V is provided by the pin 4 in the port, and the signal is collected by the pin 3 in the port.

10. A method for operating a multifunctional hydraulic distributor with high and low pressure switching according to any one of claims 1 to 9, characterized in that: It includes the following steps: Step 1: First, select the function; Step 2: When starting without impact, use the high and low voltage switching block (8) to perform low voltage starting; Step 3: Wait for the set value of the pressure sensor (13) to stabilize at (1±10%)P 低 When , start the high voltage function; Step 4: When there is no high or low pressure start-up requirement, directly open the cartridge valve (6); Step 5: At this time, the distributor is started and the servo system is running. During the operation, the computer monitors the value of the pressure sensor (13) and the status of the high-pressure filter blockage alarm interface (3.2) in real time; Step 6: When the test is complete, close the dispenser.

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