Hydraulic control system for safe rapid opening or closing of valve

Abstract

Disclosed is a hydraulic control system for safe rapid opening or closing of a valve. The hydraulic control system comprises a hydraulic cylinder (71), a pressure oil line (141), an oil return line (151), an oil drain line (161), a quick oil return line (171) and a valve manifold (181), wherein the inside of the valve manifold is provided with a three-position four-way directional control valve (51), a bidirectional hydraulic lock (31), a first two-position four-way directional control valve (61) and an energy accumulator (191); a first cartridge valve (101) is connected between the oil drain line and a rod cavity of the hydraulic cylinder, and a pilot port of the first cartridge valve is connected to a port A of the first two-position four-way valve; an oil inlet of the energy accumulator is connected to each of the pressure oil line and the oil return line, a first check valve (81) is connected between the oil inlet of the energy accumulator and the pressure oil line, and a second cartridge valve (102) is connected between the first check valve and the energy accumulator; and the second cartridge valve is connected to a rodless cavity of the hydraulic cylinder, and a pilot port of the second cartridge valve is connected to the port A of the first two-position four-way directional control valve. The hydraulic control system for safe rapid opening or closing of a valve allows for safe rapid opening or closing of a valve.

Description

A hydraulic control system for safe and quick opening or closing of valves Technical Field

[0001] The present invention relates to the technical field of valve hydraulic control systems. Background Art

[0002] Currently, many hydraulically driven valves are used in the industrial sector to control the flow of media in pipelines. In addition to normal opening and closing and position retention, these valves often require rapid opening or closing in emergencies to release or cut off the media, thereby preventing significant damage to the entire system and potentially leading to production accidents.

[0003] Therefore, it is very meaningful to design a hydraulic system that can realize safe and fast opening or closing of valves to drive the corresponding valves.

[0004] Summary of the Invention

[0005] Therefore, in order to solve the above-mentioned problems, the present invention provides a hydraulic control system for quickly opening or closing valves safely.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A hydraulic control system for safe and quick opening or closing of valves, comprising a hydraulic cylinder, a pressure oil pipe, an oil return pipe, an oil drain pipe, a quick oil return pipe, and a valve station; the valve station is provided with a three-position four-way reversing valve, a two-way hydraulic lock, a first-position and two-position four-way reversing valve, and an accumulator; the hydraulic cylinder drives the valve to open or close through the movement of the piston rod;

[0008] The P port of the three-position four-way reversing valve is connected to the pressure oil pipe, and its T port is connected to the return oil pipeline; the two-way hydraulic lock is composed of two left and right hydraulically controlled one-way valves, which are respectively connected to the A port and the B port of the three-position four-way reversing valve; the two left and right hydraulically controlled one-way valves of the two-way hydraulic lock are respectively connected to the rod chamber and the rodless chamber of the hydraulic cylinder;

[0009] The P port of the first two-position four-way reversing valve is connected to the pressure oil pipe, and the T port thereof is connected to the pressure relief oil pipe; a first cartridge valve is connected between the quick return oil pipe and the rod chamber of the hydraulic cylinder, and the hydraulic control port of the first cartridge valve is connected to the A port of the first two-position four-way valve;

[0010] The oil charging port and oil drain port of the accumulator are respectively connected to the pressure oil pipe and the return oil pipe. A first one-way valve is connected between the oil charging port of the accumulator and the pressure oil pipe. A second cartridge valve is connected between the first one-way valve and the accumulator. The second cartridge valve is connected to the rodless chamber of the hydraulic cylinder, and the hydraulic control port of the second cartridge valve is connected to the A port of the first two-position four-way reversing valve; the first two-position four-way reversing valve, the first cartridge valve and the second cartridge valve form a valve group.

[0011] Optionally, a second two-position four-way reversing valve is further provided in the valve table, wherein the P port of the second two-position four-way reversing valve is connected to the pressure oil pipe, and the T port thereof is connected to the pressure relief oil pipe; a third cartridge valve is connected between the quick return oil pipe and the rod chamber of the hydraulic cylinder, wherein the hydraulic control port of the third cartridge valve is connected to the A port of the second two-position four-way reversing valve, and the third cartridge valve is arranged in parallel with the first cartridge valve;

[0012] A fourth cartridge valve is also connected between the accumulator and the first one-way valve. The fourth cartridge valve is connected to the rodless chamber of the hydraulic cylinder, and the hydraulic control port of the fourth cartridge valve is connected to the A port of the second two-position four-way reversing valve. The fourth cartridge valve is arranged in parallel with the second cartridge valve; the second two-position four-way reversing valve, the third cartridge valve, and the fourth cartridge valve form a valve group.

[0013] Optionally, a first hydraulically controlled one-way valve is provided between the P port of the three-position four-way reversing valve and the pressure oil pipe, and the control port of the first hydraulically controlled one-way valve is connected to the A port of the first two-position four-way reversing valve.

[0014] Optionally, a second hydraulically controlled one-way valve is provided between the P port of the three-position four-way reversing valve and the pressure oil pipe, and the control port of the second hydraulically controlled one-way valve is connected to the A port of the second two-position four-way reversing valve.

[0015] Optionally, a first hydraulic ball valve is further connected between the P port of the three-position four-way reversing valve and the pressure oil pipe.

[0016] Optionally, a second one-way valve is provided between the T port of the three-position four-way reversing valve and the oil return pipeline.

[0017] Optionally, the left and right hydraulically controlled one-way valves of the two-way hydraulic lock are correspondingly connected to a first one-way throttle valve and a second one-way throttle valve, the other end of the first one-way throttle valve is connected to the rod chamber of the hydraulic cylinder, and the other end of the second one-way throttle valve is connected to the rodless chamber of the hydraulic cylinder.

[0018] Optionally, a throttle valve is provided on the oil circuit connecting the second cartridge valve and the fourth cartridge valve to the rodless chamber of the hydraulic cylinder, for regulating the flow of pressurized oil flowing from the accumulator to the rodless chamber of the hydraulic cylinder.

[0019] Optionally, the quick oil return pipe is separately connected to the oil tank, and the quick oil return pipe is arranged at an angle so that the inclined lower end of the quick oil return pipe faces the oil tank.

[0020] Optionally, hydraulic hoses are provided on the pipelines on both sides of the rod chamber and the rodless chamber of the hydraulic cylinder.

[0021] The technical solution provided by the present invention has the following beneficial effects:

[0022] 1. Through the arrangement of the first cartridge valve, the second cartridge valve, and the first / two-position four-way reversing valve, the pressurized oil in the rod chamber of the hydraulic cylinder can be quickly discharged from the first cartridge valve to the rapid oil return pipe. The pressurized oil is then quickly transferred through the accumulator to the rodless chamber of the hydraulic cylinder through the second cartridge valve, thereby achieving rapid movement of the hydraulic cylinder piston rod and, in turn, rapid opening or closing of the valve, ensuring the safety and reliability of the valve system.

[0023] 2. The first valve group is formed by arranging a first two-position four-way reversing valve, a first cartridge valve, and a third cartridge valve. The second valve group is formed by arranging a second two-position four-way reversing valve, a second cartridge valve, and a fourth cartridge valve. In this way, when the solenoid of either the first two-position four-way reversing valve or the second two-position four-way reversing valve loses power, the corresponding cartridge valve opens, allowing the pressure oil in the rod chamber to quickly drain to the rapid return oil pipe, and the pressure oil in the accumulator to quickly enter the rodless chamber of the hydraulic cylinder, achieving fast opening or closing of the valve. The two valve groups serve as backup for each other, providing greater safety and reliability.

[0024] 3. Since the pressure oil pipe must be maintained within the working pressure range to ensure the normal operation of other valves or equipment, if the three-position four-way reversing valve has an electrical fault or the valve core is stuck and does not return to the neutral position, the first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve are set to de-energize the corresponding first two-position four-way reversing valve and the second two-position four-way reversing valve. This will close the first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve, preventing the pressurized oil in the pressure oil pipe from entering the three-position four-way reversing valve and subsequent pipelines, avoiding possible pressure relief and making the system safer and more reliable.

[0025] 4. The setting of the throttle valve can adjust the flow rate of oil supplied from the accumulator to the rodless chamber of the hydraulic cylinder and adjust the movement speed of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is an overall schematic diagram of this embodiment;

[0027] FIG2 is a schematic diagram of a first-position, second-position, four-way directional control valve in this embodiment;

[0028] FIG3 is a schematic diagram of a second two-position four-way reversing valve in this embodiment;

[0029] FIG4 is a schematic diagram of a three-position four-way reversing valve in this embodiment.

[0030] Explanation of the reference numerals: 11, first pressure gauge assembly; 12, second pressure gauge assembly; 13, third pressure gauge assembly; 14, fourth pressure gauge assembly; 15, fifth pressure gauge assembly; 21, first hydraulic ball valve; 22, second hydraulic ball valve; 23, third hydraulic ball valve; 24, fourth hydraulic ball valve; 25, fifth hydraulic ball valve; 31, two-way hydraulic lock; 41, first one-way throttle valve; 42, second one-way throttle valve; 51, three-position four-way reversing valve; 61, first two-position four-way reversing valve; 62, second Two-position four-way reversing valve; 71, hydraulic cylinder; 81, first one-way valve; 82, second one-way valve; 91, hydraulic hose; 101, first cartridge valve; 102, second cartridge valve; 103, third cartridge valve; 104, fourth cartridge valve; 111, first hydraulically controlled one-way valve; 112, second hydraulically controlled one-way valve; 121, throttle valve; 131, safety valve group; 141, pressure oil pipe; 151, return oil pipe; 161, drain oil pipe; 171, quick return oil pipe; 181, valve station; 191, accumulator. DETAILED DESCRIPTION

[0031] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, one of ordinary skill in the art will understand other possible embodiments and the advantages of the present invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0032] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0033] A hydraulic control system for safe and rapid valve opening or closing includes a hydraulic cylinder 71, a pressure oil pipe 141, an oil return pipe 151, an oil drain pipe 161, a rapid oil return pipe 171, and a valve station 181. Valve station 181 houses a three-position, four-way reversing valve 51, a first two-position, four-way reversing valve 61, a second two-position, four-way reversing valve 62, and an accumulator 191. The hydraulic cylinder 71 drives the valve to open or close through the movement of its piston rod. Movement of the piston rod in one direction corresponds to either valve opening or closing. Accumulator 191 enables rapid movement of the piston rod, thereby enabling rapid valve closing or opening.

[0034] The valve station 181 is connected to the hydraulic pump station (not shown) via the pressure oil line 141, the return oil line 151, the drain oil line 161, and the quick return oil line 171. The hydraulic pump station supplies pressurized oil for valve operation via the pressure oil line 141. A first pressure gauge assembly 11 is installed on the pressure oil line 141 to monitor the pressure within the pressure oil line 141 at all times, ensuring that the pressure within the pressure oil line 141 remains within the normal operating pressure range to ensure that the valves or equipment within the valve station 181 can operate normally. Return oil from valve operation is returned to the pump station tank via the return oil line 151. Leakage oil from various hydraulic valves and hydraulic cylinders 71 is returned to the pump station tank via the drain oil line 161. Quick return oil for valve "quick opening" operations is returned to the pump station tank via a dedicated quick return oil line 171. With the exception of the pressure oil line 141, which always carries high-pressure power oil, all other oil lines are low-pressure. The quick oil return pipe 171 is designed to be connected to the oil tank separately and always maintains an oil return slope inclined toward the oil tank, so that no oil accumulates in the quick oil return pipe 171, ensuring fast and smooth oil return.

[0035] The P port of the three-position, four-way directional valve 51 is connected to the pressure oil pipe 141, with the first hydraulic ball valve 21 connected between them. The T port is connected to the oil return pipe 151, with the second check valve 82 connected between them. The two-way hydraulic lock 31 consists of two left and right hydraulically controlled check valves. The A and B ports of the three-position, four-way directional valve 51 are connected to the left and right hydraulically controlled check valves of the two-way hydraulic lock 31, respectively. The hydraulic control port of the left hydraulically controlled check valve is connected to the B port of the three-position, four-way directional valve 51, while the hydraulic control port of the right hydraulically controlled check valve is connected to the A port of the three-position, four-way directional valve 51. The left and right hydraulically controlled check valves of the two-way hydraulic lock 31 are connected to a first one-way throttle valve 41 and a second one-way throttle valve 42, respectively. The other end of the first one-way throttle valve 41 is connected to the rod chamber of the hydraulic cylinder 71, while the other end of the second one-way throttle valve 42 is connected to the rodless chamber of the hydraulic cylinder 71. A second hydraulic ball valve 22 and a third hydraulic ball valve 23 are connected in series between the first one-way throttle valve 41 and the rod chamber of the hydraulic cylinder 71. A second pressure gauge assembly 12 is provided between the first one-way throttle valve 41 and the second hydraulic ball valve 22, and a third pressure gauge assembly 13 is provided between the second and third hydraulic ball valves 22 and 23. A fourth hydraulic ball valve 24 and a fifth hydraulic ball valve 25 are connected in series between the second one-way throttle valve 42 and the rodless chamber of the hydraulic cylinder 71. A fourth pressure gauge assembly 14 is provided between the second one-way throttle valve 42 and the fourth hydraulic ball valve 24, and a fifth pressure gauge assembly 15 is provided between the fourth and fifth hydraulic ball valves 24 and 25. In addition, hydraulic hoses 91 are respectively provided on the oil pipes connected to the rod cavity and the rodless cavity on both sides of the hydraulic cylinder 71 to overcome the influence of the swing or vibration of the hydraulic cylinder 71 on the pipes when the valve is actuated. At the same time, it can also avoid the need to dismantle the hard pipe when disassembling the hydraulic cylinder 71, making inspection and maintenance more convenient.

[0036] The first two-position four-way valve's port P is connected to the pressure oil line 141, its port T is connected to the drain line 161, and its port B is sealed with a plug. A first cartridge valve 101 is connected between the quick return oil line 171 and the rod chamber of the hydraulic cylinder 71. The hydraulic control port of the first cartridge valve 101 is connected to port A of the first two-position four-way reversing valve 61. The second two-position four-way reversing valve 62 has its port P connected to the pressure oil line 141, its port T connected to the drain line 161, and its port B sealed with a plug. A third cartridge valve 103 is also connected between the quick return oil line 171 and the rod chamber of the hydraulic cylinder 71. The hydraulic control port of the third cartridge valve 103 is connected to port A of the second two-position four-way valve. The first and third cartridge valves 101 and 103 are arranged in parallel. In addition, a first hydraulically controlled check valve 111 is connected between port P of the three-position, four-way directional valve 51 and the first hydraulic ball valve 21. The control port of the first hydraulically controlled check valve 111 is connected to port A of the first two-position, four-way directional valve 61. A second hydraulically controlled check valve 112 is also connected between port P of the three-position, four-way directional valve 51 and the first hydraulic ball valve 21. The control port of the second hydraulically controlled check valve 112 is connected to port A of the second two-position, four-way directional valve 62. By providing the first hydraulically controlled one-way valve 111 and the second hydraulically controlled one-way valve 112, when the electromagnets of the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62 are both de-energized, the hydraulic control ports of the first hydraulically controlled one-way valve 111 and the second hydraulically controlled one-way valve 112 are connected to the oil drain pipe 161 via the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62, respectively, and the first hydraulically controlled one-way valve 111 and the second hydraulically controlled one-way valve 112 are closed. At this time, even if the three-position four-way reversing valve 51 experiences an electrical fault or the valve core is stuck and cannot return to the neutral position, the pressurized oil in the pressure oil pipe 141 will not enter the three-position four-way reversing valve 51 and the subsequent pipelines, causing pressure relief. In addition, in the present embodiment, the first hydraulically controlled one-way valve 111 and the second hydraulically controlled one-way valve 112 are connected in series between the P port of the three-position four-way reversing valve 51 and the first hydraulic ball valve 21; in this way, when the hydraulic cylinder 71 returns oil quickly, even if only one of the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62 returns to the right valve position, the corresponding hydraulically controlled one-way valve should be closed, thereby ensuring that the pressure oil in the pressure oil pipe 141 will not enter the three-position four-way reversing valve 51 and the subsequent pipelines, causing possible pressure relief, thereby ensuring system safety.

[0037] The oil filling and drain ports of accumulator 191 are connected to a safety valve assembly 131, which in turn connects to the pressure oil pipe 141 and the oil return pipe 151, respectively. Safety valve assembly 131 comprises a relief valve, a normally closed hydraulic ball valve, and a normally open hydraulic ball valve. The relief valve and the normally closed ball valve are connected in parallel between accumulator 191 and oil return pipe 151. The relief valve provides safety protection for the accumulator. When the oil pressure in the accumulator is too high, the relief valve relieves the pressure to a safe level. When the normally closed ball valve opens, the accumulator is unloaded. The normally open hydraulic ball valve is connected between the accumulator 191 filling port and the pressure oil pipe 141 to ensure normal oil filling of the accumulator 191. A first one-way valve 81 is installed between the pressure oil pipe 141 and the hydraulic ball valve of the safety valve assembly 131. This ensures that, regardless of any fluctuations in the pressure of the pressure oil pipe 141, the pressure oil in the accumulator 191 will not be delivered to the pressure oil pipe 141. Furthermore, whenever the pressure oil in the accumulator 191 decreases, the pressure oil in the pressure oil pipe 141 can be replenished to the accumulator 191, ensuring that there is always sufficient pressure oil in the accumulator 191 to meet the requirements of the rapid opening or closing of the hydraulic cylinder 71, ensuring safety and reliability. A second cartridge valve 102 and a fourth cartridge valve 104 are installed in parallel between the rodless chamber of the hydraulic cylinder 71 and the accumulator 191. The hydraulic control port of the second cartridge valve 102 is connected to port A of the first two-position four-way valve, and the hydraulic control port of the fourth cartridge valve 104 is connected to port A of the second two-position four-way valve. Among them, a throttle valve 121 is provided on the common pipeline connecting the second cartridge valve 102 and the fourth cartridge valve 104 to the rodless chamber of the hydraulic cylinder 71. The setting of the throttle valve 121 can adjust the oil flow from the accumulator 191 to the rodless chamber of the hydraulic cylinder 71 to adjust the speed of the hydraulic cylinder 71 driving the valve to open or close quickly.

[0038] The accumulator 191 can supply oil to the rodless chamber of the hydraulic cylinder 71 through the second cartridge valve 102 or the fourth cartridge valve 104, and quickly discharge the oil in the rod chamber of the hydraulic cylinder 71 through the first cartridge valve 101 or the third cartridge valve 103 into the quick oil return pipe 171, thereby achieving rapid opening or closing of the valve driven by the hydraulic cylinder 71. In this embodiment, the first 2-position four-way reversing valve 61, the first cartridge valve 101, and the third cartridge valve 103 form a first valve group, and the second 2-position four-way reversing valve 62, the second cartridge valve 102, and the fourth cartridge valve 104 form a second valve group. In this way, when the electromagnet of either the first two-position four-way reversing valve 61 or the second two-position four-way reversing valve 62 loses power, the corresponding cartridge valve opens, allowing the pressure oil in the rod chamber to quickly drain to the quick return oil pipe 171, and the pressure oil in the accumulator 191 to quickly enter the rodless chamber of the hydraulic cylinder 71, thereby achieving rapid opening or closing of the valve. In other words, in extreme cases, as long as one of the first two-position four-way reversing valve 61 or the second two-position four-way reversing valve 62 loses power and the valve core returns to the right valve position, even if the electromagnet of the other two-position four-way reversing valve experiences an electrical failure or the reversing valve core becomes stuck, the piston rod of the hydraulic cylinder 71 can still move rapidly, thereby achieving rapid opening or closing of the valve. The two valve groups serve as backup for each other, making them safer and more reliable. In other embodiments, more two-position four-way reversing valves and corresponding cartridge valves can be provided to form multiple valve groups, rather than being limited to the two valve groups in this embodiment.

[0039] In this embodiment, the piston rod of the hydraulic cylinder 71 is extended to drive the valve to open, and the piston rod of the hydraulic cylinder 71 is retracted to drive the valve to close. In other embodiments, the piston rod can be extended for closing and retracted for opening.

[0040] Table 1: Electromagnetic gain and loss meter for three-position four-way reversing valve, first two-position four-way reversing valve, and second two-position four-way reversing valve

[0041] It should be noted that: "+" indicates power on, and "-" indicates power off; DT is the electromagnet for the left valve position of the first two-position four-way reversing valve 61, 2DT is the electromagnet for the left valve position of the second two-position four-way reversing valve 62, and 3DT and 4DT are the electromagnets for the left and right valve positions of the three-position four-way reversing valve 51 respectively.

[0042] The various action processes of the hydraulic cylinder 71 are as follows:

[0043] 1. When the hydraulic cylinder 71 performs the normal "closing" action on the valve:

[0044] Electromagnet 1DT of the first two-position four-way reversing valve 61, electromagnet 2DT of the second two-position four-way reversing valve 62, and electromagnet 4DT of the three-position four-way reversing valve 51 are energized, while electromagnet 3DT of the three-position four-way reversing valve 51 is de-energized. Consequently, the electromagnets of the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62 are both in the left valve position, while the three-position four-way reversing valve 51 is in the right valve position.

[0045] At this time, the pressure oil in the pressure oil pipe 141 enters the hydraulic control ports of the first hydraulically controlled one-way valve 111 and the second hydraulically controlled one-way valve 112 through the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62, respectively, thereby opening the first hydraulically controlled one-way valve 111 and the second hydraulically controlled one-way valve 112; the pressure oil in the pressure oil pipe 141 enters the hydraulic control ports of the first cartridge valve 101 and the second cartridge valve 102 through the first two-position four-way reversing valve 61, and enters the hydraulic control ports of the second cartridge valve 102 through the second two-position four-way reversing valve 62. Valve 62 enters the hydraulic control ports of third cartridge valve 103 and fourth cartridge valve 104, respectively. At this point, first, second, third, and fourth cartridge valves 101, 102, 103, and 104 are all closed. The pressure oil in the rod chamber of hydraulic cylinder 71 cannot escape through first or third cartridge valve 101, 103, to quick return oil pipe 171. Furthermore, the pressure oil in accumulator 191 cannot enter the rodless chamber of hydraulic cylinder 71 through second or fourth cartridge valve 102, 104. The pressure oil in pressure oil pipe 141 flows through three-position, four-way reversing valve 51, opening the hydraulically controlled check valve on the right side of two-way hydraulic lock 31, allowing return oil from the rodless chamber of hydraulic cylinder 71 to flow.

[0046] In this way, the pressurized oil in the pressure oil pipe 141 can enter the rod chamber of the hydraulic cylinder 71 through the first hydraulic ball valve 21, the first hydraulically controlled check valve 111, the second hydraulically controlled check valve 112, the three-position four-way reversing valve 51, the hydraulically controlled check valve on the left side of the two-way hydraulic lock 31, the first one-way throttle valve 41, the second hydraulic ball valve 22, and the third hydraulic ball valve 23, pushing the piston rod back. The hydraulic oil in the rodless chamber of the hydraulic cylinder 71 then flows through the fifth hydraulic ball valve 25, the fourth hydraulic ball valve 24, the second one-way throttle valve 42, the hydraulically controlled check valve on the right side of the two-way hydraulic lock 31, the three-position four-way reversing valve 51, and the second one-way valve 82, entering the return oil pipe 151 and then flowing back to the pump station tank. At this point, the valve is normally "closed." The return oil flow rate, and therefore the speed of the valve's normal closing, can be adjusted by adjusting the opening of the second one-way throttle valve 42.

[0047] 2. When the hydraulic cylinder 71 performs the normal "opening" action on the valve:

[0048] Electromagnet 1DT of the first two-position four-way reversing valve 61, electromagnet 2DT of the second two-position four-way reversing valve 62, and electromagnet 3DT of the three-position four-way reversing valve 51 are energized, while electromagnet 4DT of the three-position four-way reversing valve 51 is de-energized. Consequently, the electromagnets of the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62 are both in the left valve position, and the three-position four-way reversing valve 51 is in the left valve position.

[0049] At this time, the pressure oil in the pressure oil pipe 141 enters the hydraulic control ports of the first hydraulically controlled one-way valve 111 and the second hydraulically controlled one-way valve 112 through the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62, respectively, thereby opening the first hydraulically controlled one-way valve 111 and the second hydraulically controlled one-way valve 112; the pressure oil in the pressure oil pipe 141 enters the hydraulic control ports of the first cartridge valve 101 and the second cartridge valve 102 through the first two-position four-way reversing valve 61, and enters the hydraulic control ports of the second cartridge valve 102 through the second two-position four-way reversing valve 62. Valve 62 enters the hydraulic control ports of third cartridge valve 103 and fourth cartridge valve 104, respectively. At this point, first, second, third, and fourth cartridge valves 101, 102, 103, and 104 are all closed. The pressure oil in the rod chamber of hydraulic cylinder 71 cannot escape through first or third cartridge valve 101, 103, to quick return oil pipe 171. Furthermore, the pressure oil in accumulator 191 cannot enter the rodless chamber of hydraulic cylinder 71 through second or fourth cartridge valve 102, 104. The pressure oil in pressure oil pipe 141 flows through three-position, four-way reversing valve 51, opening the hydraulically controlled check valve on the left side of two-way hydraulic lock 31, allowing return oil from the rod chamber of hydraulic cylinder 71 to flow.

[0050] In this way, the pressurized oil in the pressure oil pipe 141 can enter the rodless chamber of the hydraulic cylinder 71 through the first hydraulic ball valve 21, the first hydraulically controlled check valve 111, the second hydraulically controlled check valve 112, the three-position four-way reversing valve 51, the hydraulically controlled check valve on the right side of the two-way hydraulic lock 31, the second one-way throttle valve 42, the fourth hydraulic ball valve 24, and the fifth hydraulic ball valve 25, pushing the piston rod out. The hydraulic oil in the rod chamber of the hydraulic cylinder 71 then flows through the third hydraulic ball valve 23, the second hydraulic ball valve 22, the first one-way throttle valve 41, the hydraulically controlled check valve on the left side of the two-way hydraulic lock 31, the three-position four-way reversing valve 51, and the second one-way valve 82, and then into the return oil pipe 151, where it flows back to the pump station tank. At this point, the valve is normally "open." The return oil flow rate, and therefore the speed at which the valve closes normally, can be adjusted by adjusting the opening of the left side of the dual one-way return oil throttle valve 121.

[0051] 3. When the hydraulic cylinder 71 performs the "holding" action on the valve:

[0052] That is, when the valve is fully opened or closed or in the middle position, if the position needs to be maintained, that is, the hydraulic cylinder 71 is not actuated, the electromagnet 1DT of the first 2-position 4-way directional valve 61 and the electromagnet 2DT of the second 2-position 4-way directional valve 62 are both energized, while the electromagnets 3DT and 4DT of the 3-position 4-way directional valve 51 are both de-energized. At this time, both 2-position 4-way directional valves are in the left valve position, and the 3-position 4-way directional valve 51 is in the middle valve position.

[0053] At this time: since the three-position four-way reversing valve 51 is in the middle valve position, the internal hydraulic control ports of the two-way hydraulic lock 31 are connected to the return oil pipe 151, and the left and right sides of the two-way hydraulic lock 31 are both closed in both directions; the pressure oil in the pressure oil pipe 141 enters the hydraulic control ports of the first cartridge valve 101 and the second cartridge valve 102 respectively through the first two-position four-way reversing valve 61, and enters the hydraulic control ports of the third cartridge valve 103 and the fourth cartridge valve 104 respectively through the second two-position four-way reversing valve 62. At this time, the first cartridge valve 101, the second cartridge valve 102, the third cartridge valve 103 and the fourth cartridge valve 104 are all closed, and the pressure oil in the rod chamber of the hydraulic cylinder 71 cannot be discharged to the quick return oil pipe 171 through the first cartridge valve 101 or the third cartridge valve 103, and the pressure oil in the accumulator 191 cannot enter the rodless chamber of the hydraulic cylinder 71 through the second cartridge valve 102 or the fourth cartridge valve 104.

[0054] Although the pressure oil in the pressure oil pipe 141 also enters the hydraulic ports of the first hydraulically controlled check valve 111 and the second hydraulically controlled check valve 112 through the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62, respectively, opening the first hydraulically controlled check valve 111 and the second hydraulically controlled check valve 112, because the three-position four-way reversing valve 51 is in the middle valve position and the two-way hydraulic lock 31 is bidirectionally closed, the pressure oil in the pressure oil pipe 141 cannot enter the hydraulic cylinder 71. Therefore, the pressure oil in the rod chamber of the hydraulic cylinder 71 cannot be depressurized or circulated, and the piston rod of the hydraulic cylinder 71 is locked and immobilized, thereby maintaining the valve position.

[0055] 4. When the hydraulic cylinder 71 performs a "quick opening" action on the valve:

[0056] When the electromagnet 1DT of the first two-position four-way reversing valve 61, the electromagnet 2DT of the second two-position four-way reversing valve 62, and the electromagnet 3DT and the electromagnet 4DT of the three-position four-way reversing valve 51 are all de-energized, the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62 are both in the right valve position, and the three-position four-way reversing valve 51 is in the middle valve position.

[0057] At this time: the first hydraulically controlled one-way valve 111 is connected to the oil drain pipe 161 through the first two-position four-way reversing valve 61, and the hydraulic control port of the second hydraulically controlled one-way valve 112 is connected to the oil drain pipe 161 through the second two-position four-way reversing valve 62. Therefore, the first hydraulically controlled one-way valve 111 and the second hydraulically controlled one-way valve 112 are both closed; since the three-position four-way reversing valve 51 is in the middle valve position, the hydraulic control ports of the left and right hydraulically controlled one-way valves inside the two-way hydraulic lock 31 are both connected to the oil return pipe 151, and both directions of the two-way hydraulic lock 31 are closed. The hydraulic control port of the first cartridge valve 101 is connected to the oil drain pipe 161 via the first 2-position 4-way reversing valve 61, and the hydraulic control port of the third cartridge valve 103 is connected to the oil drain pipe 161 via the second 2-position 4-way reversing valve 62. When the first and third cartridge valves 101 and 103 are opened, the pressure oil in the rod chamber of the hydraulic cylinder 71 is released and discharged into the quick oil return pipe 171 through the first and third cartridge valves 101 and 103. The hydraulic control port of the second cartridge valve 102 is connected to the oil drain pipe 161 via the first 2-position 4-way reversing valve 61, and the hydraulic control port of the fourth cartridge valve 104 is connected to the oil drain pipe 161 via the second 2-position 4-way reversing valve 62. When the second and fourth cartridge valves 102 and 104 are opened, the pressure oil stored in the accumulator 191 enters the rod chamber of the hydraulic cylinder 71 through the second and fourth cartridge valves 102 and 104, and the throttle valve 121, pushing the piston rod out. Among them, since the flow provided by the accumulator 191 is very large and the flow capacity of each cartridge valve is also very large, the corresponding pipeline from the accumulator 191 to the rodless chamber, the pipeline from the rod chamber through the cartridge valve to the quick oil return pipe 171, and the quick oil return pipe 171 are all designed as large-diameter pipelines to reduce resistance to meet the requirements of rapid oil supply and return when the valve opens quickly.

[0058] In this embodiment, only one set of accumulators 191 is provided; in other embodiments, multiple sets may be provided. The valves are designed to "quickly open" or "quickly close" when the corresponding electromagnet 1DT of the first two-position four-way reversing valve 61, the electromagnet 2DT of the second two-position four-way reversing valve 62, and the electromagnets 3DT and 4DT of the three-position four-way reversing valve 51 are all de-energized. This allows the valves to be quickly and automatically "quickly opened" or "quickly closed" in the event of a system disconnection, thus protecting the valve system.

[0059] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A hydraulic control system for quickly opening or closing a valve, characterized in that: It includes a hydraulic cylinder, a pressure oil pipe, a return oil pipe, a drain oil pipe, a quick return oil pipe and a valve platform; a three-position four-way directional control valve, a two-way hydraulic lock, a first two-position four-way directional control valve and an accumulator are arranged in the valve platform; the hydraulic cylinder drives the valve to open or close through the movement of the piston rod. The P port of the three-position four-way directional control valve is connected to the pressure oil pipe, and its T port is connected to the return oil pipeline; the two-way hydraulic lock is composed of two pilot-operated check valves on the left and right, and is respectively connected to the A port and B port of the three-position four-way directional control valve correspondingly; the two pilot-operated check valves of the two-way hydraulic lock are respectively connected to the rod chamber and the rodless chamber of the hydraulic cylinder. The P port of the first two-position four-way directional control valve is connected to the pressure oil pipe, and its T port is connected to the pressure relief oil pipe; a first cartridge valve is connected between the quick return oil pipe and the rod chamber of the hydraulic cylinder, and the pilot control port of the first cartridge valve is connected to the A port of the first two-position four-way directional control valve. The oil filling port and the oil drain port of the accumulator are respectively connected to the pressure oil pipe and the return oil pipe. A first check valve is connected between the oil filling port of the accumulator and the pressure oil pipe. A second cartridge valve is connected between the first check valve and the accumulator. The second cartridge valve is connected to the rodless chamber of the hydraulic cylinder, and the pilot control port of the second cartridge valve is connected to the A port of the first two-position four-way directional control valve; the first two-position four-way directional control valve, the first cartridge valve and the second cartridge valve form a set of valve groups.

2. The hydraulic control system for quickly opening or closing a valve safely according to claim 1, wherein: A second two-position four-way directional control valve is also arranged in the valve platform. The P port of the second two-position four-way directional control valve is connected to the pressure oil pipe, and its T port is connected to the pressure relief oil pipe; a third cartridge valve is connected between the quick return oil pipe and the rod chamber of the hydraulic cylinder. The pilot control port of the third cartridge valve is connected to the A port of the second two-position four-way directional control valve. The third cartridge valve is arranged in parallel with the first cartridge valve. A fourth cartridge valve is also connected between the accumulator and the first check valve. The fourth cartridge valve is connected to the rodless chamber of the hydraulic cylinder, and the pilot control port of the fourth cartridge valve is connected to the A port of the second two-position four-way directional control valve. The fourth cartridge valve is arranged in parallel with the second cartridge valve; the second two-position four-way directional control valve, the third cartridge valve and the fourth cartridge valve form a set of valve groups.

3. The hydraulic control system for quick opening or quick closing of a valve safety according to claim 1, wherein: A first pilot-operated check valve is arranged between the P port of the three-position four-way directional control valve and the pressure oil pipe. The control port of the first pilot-operated check valve is connected to the A port of the first two-position four-way directional control valve.

4. The hydraulic control system for quickly opening or closing a valve safely according to claim 2, characterized in that: A second pilot-operated check valve is arranged between the P port of the three-position four-way directional control valve and the pressure oil pipe. The control port of the second pilot-operated check valve is connected to the A port of the second two-position four-way directional control valve.

5. A hydraulic control system for quickly opening or closing a valve safely according to claim 1, characterized in that: A first hydraulic ball valve is also connected between the P port of the three-position four-way directional control valve and the pressure oil pipe.

6. A hydraulic control system for quickly opening or closing a valve safely according to claim 1, characterized in that: A second check valve is arranged between the T port of the three-position four-way directional control valve and the return oil pipeline.

7. A hydraulic control system for quick opening or closing of a valve safety, according to claim 1, characterized in that: The two pilot-operated check valves of the two-way hydraulic lock are correspondingly connected with a first one-way throttle valve and a second one-way throttle valve. The other end of the first one-way throttle valve is connected to the rod chamber of the hydraulic cylinder, and the other end of the second one-way throttle valve is connected to the rodless chamber of the hydraulic cylinder.

8. A hydraulic control system for quickly opening or closing a valve safely according to claim 2, characterized in that: A throttle valve is arranged on the oil path where the second cartridge valve and the fourth cartridge valve are connected to the rodless chamber of the hydraulic cylinder, for regulating the flow rate of the pressure oil flowing from the accumulator to the rodless chamber of the hydraulic cylinder.

9. A hydraulic control system for quickly opening or closing a valve safely according to claim 1, characterized in that: The quick return oil pipe is separately connected to the fuel tank, and the quick return oil pipe is arranged obliquely, with the lower end of the quick return oil pipe facing the fuel tank obliquely.

10. A hydraulic control system for fast opening or closing of a valve according to claim 1, characterized in that: Hydraulic hoses are arranged on both the rod chamber side pipeline and the rodless chamber side pipeline of the hydraulic cylinder.

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