High-reliability hydraulic control system

Abstract

A plurality of spillway gates are provided with a plurality of pump stations, each pump station comprises a left oil cylinder, a right oil cylinder, a pump station series connection ball valve assembly, a hydraulic control loop and a power source assembly, and the power source assembly is connected with the hydraulic control loop through a pipeline to drive the left oil cylinder and the right oil cylinder to open and close the spillway gates. The pump stations are connected through a main pipeline, and a plurality of pump station series connection ball valve assemblies are further arranged between the main pipeline and the hydraulic control loops and used for controlling communication or independent work of the pump stations. Displacement sensors are further arranged on the left oil cylinder and the right oil cylinder and used for controlling mutual calling and bypass deviation correction between the pump stations through displacement signals. The problems that an emergency standby device of a hydraulic system is low in universality and low in system stability and reliability are solved.

Description

Technical Field

[0001] The invention relates to the field of hydraulic system reliability control, in particular to a high-reliability hydraulic control system. Background Art

[0002] Normally, in a hydraulic system, two or more sets of pump stations control actuators. The pump stations can be connected through butterfly valves to achieve the working condition of using the oil in the tank together. However, there is no overlapping part in the oil circuit of the control actuator. Generally, in order to ensure that the pump station cannot be used due to a failure, the usual method is to add a spare pump station, add manual pump control or add emergency operator to realize the working condition of the actuator in place in an emergency.

[0003] However, standby pump stations are not only expensive but also have limited installation space, so they are rarely considered in actual situations. Manual pumps are common spare parts because they are not expensive and require little installation space. However, they cannot meet all working conditions and are slow to take effect. They are generally used in places where only one working condition needs to be met. Emergency operators are diesel-driven to provide power. Currently, their utilization rate in hydraulic gate equipment is gradually increasing. Emergency operators have an independent power system and only need to be connected to the system to complete the working conditions required by the system. However, their unique control and power system installation space is also a difficulty in their use. They cannot adapt to all usage environments. In addition, emergency operators are generally one-to-one to control actuators outside the system and cannot reach between pump stations. Summary of the invention

[0004] The main purpose of the present invention is to provide a high-reliability hydraulic control system to solve the problems of low versatility of emergency backup devices of hydraulic systems and low system stability and reliability.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a high-reliability hydraulic control system, multiple spillway gates are provided with multiple pump stations, each pump station includes a left oil cylinder, a right oil cylinder, a pump station series ball valve assembly, a hydraulic control circuit and a power source assembly, the power source assembly is connected to the hydraulic control circuit through a pipeline, drives the left oil cylinder and the right oil cylinder to open and close the spillway gate, multiple pump stations are connected through a main pipeline, and multiple pump station series ball valve assemblies are also provided between the main pipeline and multiple hydraulic control circuits to control the connection between the pump stations or independent work; The left oil cylinder and the right oil cylinder are also provided with displacement sensors for controlling the mutual calling and bypass deviation correction between pumping stations through displacement signals.

[0006] In the preferred embodiment, the main pipeline includes a left cylinder pipeline, a right cylinder pipeline, a rodless cavity pipeline and a ball valve pipeline. The left cylinder pipeline is connected to the rod cavity of the left oil cylinder of multiple sets of pump stations, the right cylinder pipeline is connected to the rod cavity of the right oil cylinder of multiple sets of pump stations, the rodless cavity pipeline is connected to the rodless cavity of the left oil cylinder and the right oil cylinder of multiple sets of pump stations, and the ball valve pipeline is connected to the first one-way valve on the rodless cavity of the left oil cylinder and the right oil cylinder of multiple sets of pump stations.

[0007] In the preferred embodiment, a normally closed ball valve is provided at the connection between each main pipeline and each hydraulic control loop pipeline, which is used to close the switching pipeline when each pump station works independently; A plurality of normally open ball valves are arranged on the pipelines connecting the power source assembly to the left oil cylinder and the right oil cylinder, so as to control the on-off of the internal pipelines of each independent pump station.

[0008] In the preferred embodiment, an electromagnetic reversing valve is provided in the hydraulic control circuit, the oil inlet of the electromagnetic reversing valve is closed, the working oil port is connected to the rod chamber and rodless chamber of the left cylinder and the right cylinder respectively, the oil return port is connected to the main pipeline, and an overflow valve and a second one-way valve are also provided between the main pipeline and the oil return port of the electromagnetic reversing valve.

[0009] In the preferred embodiment, two speed regulating valves and two pressure sensors are respectively provided on the connecting pipelines between the electromagnetic reversing valve and the rod chambers of the left and right cylinders, and a proportional reversing valve is also provided between the outlet pipelines of the two speed regulating valves for bypass correction.

[0010] In the preferred embodiment, the power source assembly includes two sets of parallel electric oil pumps and diesel emergency operators. One end of the diesel emergency operator is connected in parallel with the two sets of electric oil pumps through the emergency operator return oil port quick connector, and the other end is connected to the left and right oil cylinders through a pump station series ball valve assembly.

[0011] In the preferred embodiment, a sequence valve is provided on the connecting pipeline between the electromagnetic reversing valve and the rodless chambers of the left and right cylinders to control the starting sequence, staged loading or backup call of the power source components.

[0012] In a preferred embodiment, the power source assembly also includes an oil purification device, one end of which is connected to the rodless cavity of the left cylinder and the right cylinder through a rodless cavity pipeline, and the other end is connected to the electric oil pump or the diesel emergency operator.

[0013] In the preferred embodiment, the plurality of displacement sensors are connected to the piston rods of the plurality of left oil cylinders and the right oil cylinders; A main control system is also provided. Each pump station is provided with a corresponding main control chip. The main control chip is electrically connected to the displacement sensor, pressure sensor, electric oil pump, pump station series ball valve assembly and its feedback module to control the action of the motor and each valve group. Multiple main control chips are electrically connected to exchange data.

[0014] In the preferred embodiment, the main control system also includes a time synchronization chip, which is electrically connected to the pump station series ball valve assembly and power source assembly through the main control chip, and is used to control the synchronous conversion of the backup power supply and the ball valve and the synchronous conversion of the opening and closing of multiple ball valves.

[0015] The present invention provides a high-reliability hydraulic control system, which connects various control systems through an integrated ball valve group, and realizes mutual backup between pump stations through the opening and closing operations of the ball valve. In addition, for systems that require synchronous control, the motion signal of the actuator is called on the touch screen through a switch, thereby ensuring mutual backup and control between various systems, and greatly improving the stability and safety of equipment operation.

[0016] Different from the general mutual backup of multiple pump stations, the present invention realizes control sharing and pipeline sharing between pump stations through mutual calling of actuator displacement signals on the basis of mutual control and backup between multiple pump stations; multi-layer logic superposition enables each system to operate more stably and smoothly, and the ability to resist failure risks is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is the principle diagram of the hydraulic system of the present invention; Figure 2 It is a partial structural diagram of the pump station series-connected ball valve assembly of the present invention; Figure 3 It is a partial structural diagram of the power source assembly of the present invention; Figure 4 It is a partial structural diagram of the hydraulic control circuit of the present invention; Figure 5 It is a hydraulic control system of a single pump station of the present invention; Figure 6 It is a synchronous control system of multiple pump stations of the present invention.

[0018] In the figure: pump station 1; left oil cylinder 2; right oil cylinder 3; pump station series ball valve assembly 4; normally closed ball valve 401; normally open ball valve 402; hydraulic control circuit 5; power source assembly 6; electric oil pump 601; diesel emergency operator 602; oil purification device 603; main pipeline 7; left cylinder pipeline 701; right cylinder pipeline 702; rodless cavity pipeline 703; ball valve pipeline 704; displacement sensor 8; first one-way valve 9; solenoid reversing valve 10; overflow valve 11; second one-way valve 12; speed control valve 13; pressure sensor 14; proportional reversing valve 15; emergency operator oil return port quick connector 16; sequence valve 17; main control system 100; main control chip 110; time synchronization chip 120. DETAILED DESCRIPTION

[0019] Example 1 like Figures 1 to 3 As shown, a high-reliability hydraulic control system, multiple spillway gates are provided with multiple pump stations 1, each pump station 1 includes a left oil cylinder 2, a right oil cylinder 3, a pump station series ball valve assembly 4, a hydraulic control circuit 5 and a power source assembly 6, the power source assembly 6 is connected to the hydraulic control circuit 5 through a pipeline, and drives the left oil cylinder 2 and the right oil cylinder 3 to open and close the spillway gate, multiple pump stations are connected through a main pipeline 7, and multiple pump station series ball valve assemblies 4 are also provided between the main pipeline 7 and the multiple hydraulic control circuits 5, which are used to control the connection between the pump stations 1 or independent work; The left oil cylinder 2 and the right oil cylinder 3 are also provided with displacement sensors 8 for controlling the mutual calling and bypass deviation correction between the pumping stations 1 through displacement signals.

[0020] The present application is provided with a plurality of groups of spillway gates and their control pump stations 1, which are numbered in sequence. The present embodiment selects three sets of gates, i.e., pump station No. 1 controls gate No. 1, pump station No. 2 controls gate No. 2, and pump station No. 3 controls gate No. 3; the three pump stations are connected by four main pipelines 7, and the four main pipelines 7 are respectively the rod chamber of the left cylinder 2, the rod chamber of the right cylinder 3, the rodless chamber, and the control oil pipe, which are respectively connected to the rod chamber of the left cylinder 2, the rod chamber of the right cylinder 3, the rodless chamber of the left and right cylinders, and the control port of the hydraulically controlled one-way valve 9 on the rodless chamber of the left and right cylinders of the three sets of gates. Each main pipeline 7 enters each hydraulic system and is separated by a ball valve, so that the three pump stations 1 can be interconnected or work independently.

[0021] In the preferred embodiment, the main pipeline 7 includes a left cylinder pipeline 701, a right cylinder pipeline 702, a rodless cavity pipeline 703 and a ball valve pipeline 704. The left cylinder pipeline 701 is connected to the rod cavity of the left oil cylinder 2 of multiple sets of pump stations 1, the right cylinder pipeline 702 is connected to the rod cavity of the right oil cylinder 3 of multiple sets of pump stations 1, the rodless cavity pipeline 703 is connected to the rodless cavity of the left oil cylinder 2 and the right oil cylinder 3 of multiple sets of pump stations 1, and the ball valve pipeline 704 is connected to the first one-way valve 9 on the rodless cavity of the left oil cylinder 2 and the right oil cylinder 3 of multiple sets of pump stations 1.

[0022] In the preferred embodiment, a normally closed ball valve 401 is provided at the connection between each main pipeline 7 and each hydraulic control loop 5 pipeline, which is used to close the switching pipeline when each pump station 1 works independently; A plurality of normally open ball valves 402 are provided on the pipelines connecting the power source assembly 6 to the left oil cylinder 2 and the right oil cylinder 3 to control the on-off of the internal pipelines of each independent pump station 1 .

[0023] In the preferred embodiment, an electromagnetic reversing valve 10 is provided in the hydraulic control circuit 5, the oil inlet of the electromagnetic reversing valve 10 is closed, the working oil port is connected to the rod chamber and the rodless chamber of the left cylinder 2 and the right cylinder 3 respectively, the oil return port is connected to the main pipeline 7, and an overflow valve 11 and a second one-way valve 12 are also provided between the main pipeline 7 and the oil return port of the electromagnetic reversing valve 10.

[0024] By connecting the main pipeline 7 to the overflow valve 11, the maximum working pressure of the main pipeline 7 is limited to prevent the system from being overloaded when the pipeline is switched.

[0025] In the preferred embodiment, two speed regulating valves 13 and two pressure sensors 14 are respectively provided on the connecting pipelines between the electromagnetic reversing valve 10 and the rod chambers of the left cylinder 2 and the right cylinder 3. A proportional reversing valve 15 is also provided between the outlet pipelines of the two speed regulating valves 13 for bypass correction.

[0026] In the preferred embodiment, the power source component 6 includes two sets of parallel electric oil pumps 601 and a diesel emergency operator 602. One end of the diesel emergency operator 602 is connected in parallel with the two sets of electric oil pumps 601 through the emergency operator oil return port quick connector 16, and the other end is connected to the left cylinder 2 and the right cylinder 3 through the pump station series ball valve assembly 4.

[0027] In the preferred embodiment, a sequence valve 17 is provided on the connecting pipeline between the electromagnetic reversing valve 10 and the rodless chambers of the left cylinder 2 and the right cylinder 3 to control the starting sequence, staged loading or backup call of the power source assembly 6.

[0028] In the preferred embodiment, the power source component 6 also includes an oil purification device 603, one end of which is connected to the rodless cavity of the left cylinder 2 and the right cylinder 3 through a rodless cavity pipeline 703, and the other end is connected to the electric oil pump 601 or the diesel emergency operator 602.

[0029] Specifically, the working process of this system is: when pump station No. 1 fails, pump station No. 2 is used to control spillway gate No. 1.

[0030] Gate opening condition: close ball valves 9.2, 9.3, 42.1, 42.2, 43.1, 43.4, 44.1 on pump station No. 1, open ball valves 42.3, 42.4, 42.5, 42.6, 42.7, 42.8, 43.2, 43.3, 44.2 on pump station No. 1, close ball valves 9.2, 9.3, 42.5, 42.6, 42.7, 42.8, 43.3 on pump station No. 2, open ball valves 42.1, 42.2, 42.3, 42.4, 43.1, 43.2, 44.1, 44.2 on pump station No. 2; electromagnet DT1 is energized, the motor pump group of pump station No. 2 starts, and the delay is about 5 seconds Electromagnet DT1 loses power, the system builds pressure, and electromagnet DT2 is energized. The hydraulic oil of pump station No. 2 enters the ball valve group on pump station No. 1 through the electromagnetic reversing valve 10, speed regulating valve 13, ball valve group of pump station No. 2, and external connecting oil pipe, and then enters the rod chamber of spillway gate No. 1 through ball valves 42.5 and 42.6 on the ball valve group of pump station No. 1. The rodless chamber oil enters the ball valve group of pump station No. 2 through the ball valve group of pump station No. 1 and external connecting oil pipe, and then passes through 44.2 and 44 on the ball valve group of pump station No. 2, sequence valve 17 on pump stations No. 1 and 2, proportional reversing valve 15, and oil purification device 603 to return to the oil tank, and spillway gate No. 1 is opened; Gate closing: Close ball valves 9.2, 9.3, 42.1, 42.2, 43.1, 43.4, 44.1 on pump station No. 1, open ball valves 42.3, 42.4, 42.5, 42.6, 42.7, 42.8, 43.2, 43.3, 44.2 on pump station No. 1, close ball valves 9.2, 9.3, 42.5, 42.6, 42.7, 42.8, 43.3 on pump station No. 2, open ball valves 42.1, 42.2, 42.3, 42.4, 43.1, 43.2, 44.1, 44.2 on pump station No. 2; electromagnet DT1 is energized, the motor pump group of pump station No. 2 starts, electromagnet DT1 loses power after a delay of about 5 seconds, the system builds pressure, electromagnet DT2 is energized, and pump station No. 2 starts. The hydraulic oil passes through the electromagnetic reversing valve 10 on the No. 2 pump station, the ball valve group of the No. 2 pump station, and then enters the ball valve group of the No. 1 pump station through the external connecting pipeline, and opens the hydraulic control check valve 9 of the rod chamber of the oil cylinder through the ball valves 43.2 and 43.3 on the ball valve group of the No. 1 pump station, and enters the rodless chamber of the oil cylinder through the ball valves 44.2, 44.7, 44.8 on the ball valve group of the No. 1 pump station. The oil in the rod chamber passes through the ball valves 42.5, 42.3, 42.6, 42.4 on the ball valve group of the No. 1 pump station, and the external connecting pipeline to the ball valves 42.3, 42.1, 42.4, 42.2 on the ball valve group of the No. 2 pump station, and the speed regulating valve 13, the electromagnetic reversing valve 10, and the oil purification device 603 on the No. 2 pump station return to the oil tank, and the No. 1 spillway gate is closed; Because the opening information of the cylinders of the three hydraulic systems can be read from each other through communication signals, the synchronization of the No. 1 spillway gate can be bypassed and corrected through the proportional reversing valve 15 on the No. 2 pump station, which can ensure the normal use of the No. 1 gate.

[0031] The principle that Pump Station No. 1 controls spillway gates No. 2 and No. 3, Pump Station No. 2 controls gate No. 3, and Pump Station No. 3 controls spillway gates No. 1 and No. 2 is the same as above.

[0032] Example 2 Further illustrate with reference to Example 1, Figures 1 to 4 As shown, the plurality of displacement sensors 8 are connected to the piston rods of the plurality of left oil cylinders 2 and right oil cylinders 3; A main control system 100 is also provided, and each pump station 1 is provided with a corresponding main control chip 110, and the main control chip 110 is electrically connected with the displacement sensor 8, the pressure sensor 14, the electric oil pump 601, the pump station series ball valve assembly 4 and its feedback module, and is used to control the action of the motor and each valve group; The multiple main control chips 110 are electrically connected to exchange data.

[0033] In the main control system 100, the main control chips 110 of spillway gate No. 1, spillway gate No. 2 and spillway gate No. 3 are all connected via a network cable. The three main control chips 110 exchange sensor data of their respective controlled gates via the ModBus TCP protocol, and with the cooperation of the valve circuits of the hydraulic control pipeline, multiple backup functions can be realized between multiple control cabinets and multiple pump stations and multiple hydraulic gate hoists.

[0034] Example 3 Further description is given in conjunction with Example 1 and Example 2. Figures 1 to 5 As shown, the main control system 100 also includes a time synchronization chip 120, which is electrically connected to the pump station series ball valve assembly 4 and the power source assembly 6 through the main control chip 110, and is used to control the synchronous conversion of the backup power supply and the ball valve and the synchronous conversion of the opening and closing of multiple ball valves.

[0035] A common time source is established through the time synchronization chip 120 to ensure that all the master control chips 110 trigger operations on the same clock edge to achieve operation synchronization.

[0036] In the hydraulic hoist system of large-scale water conservancy projects, if the conversion of multiple ball valves is not synchronized, it may cause inconsistent actions of the gate cylinders, thus affecting the normal opening and closing of the gates, and may even cause damage to the gate structure. Installing a time synchronization unit can ensure that multiple ball valves are converted according to the preset time sequence and rhythm, so that the fluid flow in the system is orderly and the stable operation of the system is maintained.

[0037] Asynchronous ball valve switching may cause instantaneous changes and fluctuations in system pressure. In industrial pipeline hydraulic systems, such pressure fluctuations may impact pipelines and hydraulic components, reduce equipment life, and in severe cases may cause pipeline ruptures, component damage and other failures. The time synchronization unit can synchronize ball valve switching, reduce pressure mutations, and ensure system pressure stability.

[0038] When the main power fails, the backup power supply must be put into use in time. If the backup power switching is not synchronized with the ball valve conversion, the hydraulic system oil supply may be interrupted or abnormal at the moment of switching, affecting the normal operation of the system. Synchronizing the backup power switching with the ball valve conversion can ensure that the hydraulic system continues to supply oil stably during the power switching process, ensuring the normal operation of the system.

[0039] The synchronous conversion of multiple ball valves can make the workflow of the hydraulic system smoother and more efficient, and enhance the safety of the system.

[0040] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A high reliability hydraulic control system, characterized by: A plurality of spillway gates are provided with a plurality of pump stations (1), each pump station (1) comprising a left oil cylinder (2), a right oil cylinder (3), a pump station series ball valve assembly (4), a hydraulic control circuit (5) and a power source assembly (6), the power source assembly (6) being connected to the hydraulic control circuit (5) via a pipeline to drive the left oil cylinder (2) and the right oil cylinder (3) to open and close the spillway gates, the plurality of pump stations being connected via a main pipeline (7), and a plurality of pump station series ball valve assemblies (4) being provided between the main pipeline (7) and the plurality of hydraulic control circuits (5) to control the interconnection or independent operation of the pump stations (1); The left oil cylinder (2) and the right oil cylinder (3) are also provided with displacement sensors (8) for controlling the mutual calling and bypass deviation correction between the pump stations (1) through displacement signals.

2. A high reliability hydraulic control system according to claim 1, characterized in that: The main pipeline (7) comprises a left cylinder pipeline (701), a right cylinder pipeline (702), a rodless cavity pipeline (703) and a ball valve pipeline (704); the left cylinder pipeline (701) is connected to the rod cavity of the left oil cylinder (2) of the multiple pumping stations (1); the right cylinder pipeline (702) is connected to the rod cavity of the right oil cylinder (3) of the multiple pumping stations (1); the rodless cavity pipeline (703) is connected to the rodless cavity of the left oil cylinder (2) and the right oil cylinder (3) of the multiple pumping stations (1); and the ball valve pipeline (704) is connected to the first one-way valve (9) on the rodless cavity of the left oil cylinder (2) and the right oil cylinder (3) of the multiple pumping stations (1).

3. A high reliability hydraulic control system according to claim 1, characterized in that: A normally closed ball valve (401) is provided at the connection point between each main pipeline (7) and each hydraulic control circuit (5) pipeline, which is used to close the switching pipeline when each pump station (1) works independently; A plurality of normally open ball valves (402) are provided on the pipelines connecting the power source assembly (6) to the left oil cylinder (2) and the right oil cylinder (3), and are used to control the on-off of the internal pipelines of each independent pump station (1).

4. A high reliability hydraulic control system according to claim 1, characterized in that: The hydraulic control circuit (5) is provided with an electromagnetic reversing valve (10), the oil inlet of the electromagnetic reversing valve (10) is closed, the working oil port is respectively connected to the rod chamber and the rodless chamber of the left cylinder (2) and the right cylinder (3), the oil return port is connected to the main pipeline (7), and an overflow valve (11) and a second non-return valve (12) are also provided between the main pipeline (7) and the oil return port of the electromagnetic reversing valve (10).

5. A high reliability hydraulic control system according to claim 4, characterized in that: Two speed regulating valves (13) and two pressure sensors (14) are respectively arranged on the connecting pipelines between the electromagnetic reversing valve (10) and the rod chambers of the left oil cylinder (2) and the right oil cylinder (3), and a proportional reversing valve (15) is also arranged between the outlet pipelines of the two speed regulating valves (13) for bypass deviation correction.

6. A high reliability hydraulic control system according to claim 1, characterized in that: The power source assembly (6) comprises two sets of parallel electric oil pumps (601) and a diesel emergency operator (602); one end of the diesel emergency operator (602) is connected in parallel to the two sets of electric oil pumps (601) via an emergency operator oil return port quick connector (16), and the other end is connected to the left oil cylinder (2) and the right oil cylinder (3) via a pump station series ball valve assembly (4).

7. A high reliability hydraulic control system according to claim 6, characterized in that: A sequence valve (17) is provided on the connecting pipeline between the electromagnetic reversing valve (10) and the rodless chambers of the left oil cylinder (2) and the right oil cylinder (3) for controlling the start sequence, staged loading or backup call of the power source assembly (6).

8. The high reliability hydraulic control system according to claim 1, characterized in that: The power source assembly (6) further comprises an oil receiving and purifying device (603), one end of which is connected to the rodless cavities of the left oil cylinder (2) and the right oil cylinder (3) via a rodless cavity pipeline (703), and the other end of which is connected to the electric oil pump (601) or the diesel emergency operator (602).

9. A high reliability hydraulic control system according to claim 1, characterized in that: The plurality of displacement sensors (8) are connected to the piston rods of the plurality of left oil cylinders (2) and right oil cylinders (3); A main control system (100) is also provided, and each pump station (1) is provided with a corresponding main control chip (110), the main control chip (110) being electrically connected to a displacement sensor (8), a pressure sensor (14), an electric oil pump (601), a pump station series ball valve assembly (4) and a feedback module thereof, and being used to control the movement of the motor and each valve group; The plurality of main control chips (110) are electrically connected to exchange data.

10. A high reliability hydraulic control system according to claim 9, characterized in that: The main control system (100) further comprises a time synchronization chip (120), which is electrically connected to the pump station series ball valve assembly (4) and the power source assembly (6) through the main control chip (110) and is used to control the synchronous conversion of the backup power supply and the ball valve and the synchronous conversion of the opening and closing of multiple ball valves.

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