Hydraulic system for safe quick opening or closing of valve

Abstract

A hydraulic system for safe quick opening or closing of a valve, which relates to the technical field of valve hydraulic systems, and solves the problem of difficulty in quickly opening and closing valves. The hydraulic system comprises a hydraulic cylinder (71) having an adjustable spring (711), a pressure oil pipe (130), an oil return pipe (140), an oil drain pipe (150), a quick oil return pipe (160) and a valve manifold (120), a three-position four-way directional control valve (51) and a first two-position four-way directional control valve (61) being provided in the valve manifold. A P port of the three-position four-way directional control valve is connected to the pressure oil pipe, a T port thereof is connected to the oil return pipe, a port A thereof is blocked, and a port B thereof is connected to a rod end chamber of the hydraulic cylinder. A first cartridge valve (101) is connected between the hydraulic cylinder and the quick oil return pipe. A port P of the first two-position four-way directional control valve is connected to the pressure oil pipe, a T port thereof is connected to the oil return pipe, a port A thereof is connected to a hydraulic control port of the first cartridge valve, and a port B thereof is blocked. The system can safely and quickly open or close valves.

Description

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

[0001] The present invention relates to the technical field of valve hydraulic 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 system with a valve that can be opened or closed safely and quickly.

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

[0007] A hydraulic system for safe and quick opening or closing of valves, comprising a hydraulic cylinder with an adjustable spring, a pressure oil pipe, an oil return pipe, an oil drain pipe, a quick oil return pipe, and a valve station; the oil inlet and outlet of the hydraulic cylinder are the same oil port and are located on one side of the rod cavity of the hydraulic cylinder; the hydraulic cylinder drives the valve to open or close through the movement of the piston rod; the valve station is provided with a three-position four-way reversing valve and a first-position two-position four-way reversing valve;

[0008] The P port of the three-position four-way reversing valve is connected to the pressure oil pipe, the T port is connected to the return oil pipe, the A port is blocked, and the B port is connected to the rod chamber of the hydraulic cylinder; a first cartridge valve is connected between the hydraulic cylinder and the quick return oil pipe; the P port of the first two-position four-way reversing valve is connected to the pressure oil pipe, the T port is connected to the return oil pipe, the A port is connected to the hydraulic control port of the first cartridge valve, and the B port is blocked.

[0009] Optionally, the valve station also includes a second two-position four-way reversing valve, and a second cartridge valve arranged in parallel with the first cartridge valve is connected between the hydraulic cylinder and the quick return oil pipe; the P port of the second two-position four-way reversing valve is connected to the pressure oil pipe, the T port is connected to the return oil pipe, the A port is connected to the hydraulic control port of the second cartridge valve, and the B port is blocked.

[0010] Optionally, a first hydraulically controlled one-way valve is arranged between the P port of the three-position four-way reversing valve and the pressure oil pipe, and the hydraulic control port of the first hydraulically controlled one-way valve is respectively connected to the A port of the first two-position four-way reversing valve and the A port of the second two-position four-way reversing valve.

[0011] Optionally, a first one-way valve is arranged between the hydraulic control port of the first hydraulically controlled one-way valve and the port A of the first two-position four-way reversing valve, and a second one-way valve is arranged between the hydraulic control port of the first hydraulically controlled one-way valve and the port A of the second two-position four-way reversing valve.

[0012] Optionally, a third one-way valve is connected between the T port of the three-position four-way reversing valve and the return oil pipe, and the T port of the first two-position four-way reversing valve and the T port of the second two-position four-way reversing valve are both connected to the return oil pipe via the third one-way valve.

[0013] Optionally, a second hydraulically controlled one-way valve is connected between the B port of the three-position four-way reversing valve and the hydraulic cylinder; a third two-position four-way reversing valve is also provided in the valve platform, the P port of the third two-position four-way reversing valve is connected to the pressure oil pipe, the T port is connected to the oil drain pipe, the A port is sealed, and the B port is connected to the hydraulic control port of the second hydraulically controlled one-way valve.

[0014] Optionally, a one-way oil return throttle valve and a one-way oil inlet throttle valve are arranged in series between the three-position four-way reversing valve and the hydraulic cylinder.

[0015] Optionally, the rodless chamber of the hydraulic cylinder is provided with an oil drain port, and the oil drain port is connected to an oil drain pipe.

[0016] Optionally, an air filter is provided at the highest point of the rodless chamber end of the hydraulic cylinder.

[0017] Optionally, the quick oil return pipe is separately connected to the pump station oil tank, and the quick oil return pipe is arranged at an angle, with its inclined lower end facing the pump station oil tank.

[0018] The technical solution provided by the present invention has the following beneficial effects:

[0019] 1. By setting the first two-position four-way reversing valve and the first cartridge valve in conjunction with the three-position four-way reversing valve, the hydraulic oil in the rod chamber of the hydraulic cylinder can be quickly discharged to the quick oil return pipe through the first cartridge valve. The spring drives the piston rod to extend, thereby driving the valve to open or close quickly, ensuring the safety and reliability of the valve system.

[0020] 2. The first two-position four-way directional valve and the first cartridge valve form a valve group, and the second two-position four-way directional valve and the second cartridge valve form a valve group. When the valve needs to be opened or closed quickly, only the solenoid of any two-position four-way directional valve needs to be de-energized to open the corresponding cartridge valve, so that the pressure oil in the rod chamber of the hydraulic cylinder can be discharged to the quick return oil pipe, thereby realizing the rapid extension of the hydraulic rod piston rod to open or close the valve. The two valve groups serve as backup for each other, which is safer and more reliable.

[0021] 3. A second hydraulically controlled one-way valve is installed. When the hydraulic cylinder drives the valve to move rapidly, the solenoid of the third two-position four-way directional valve loses power, closing the second hydraulically controlled one-way valve. At this time, even if the three-position four-way directional valve experiences an electrical failure or the valve core is stuck, the pressurized oil in the pressure oil pipe will not leak through the first or second cartridge valves to the quick return pipe, causing pressure relief in the pressure oil pipe, thus ensuring the safety and reliability of the system.

[0022] 4. Because the pressure oil pipe must always maintain a normal operating pressure range, a first hydraulically controlled one-way valve is installed. When the first two-position four-way reversing valve and the second two-position four-way reversing valve lose power, the hydraulic port of the first hydraulically controlled one-way valve is connected to the return oil pipe, causing the first hydraulically controlled one-way valve to close. At this time, the pressure oil in the pressure oil pipe is blocked from entering the three-position four-way reversing valve, preventing pressure relief in the pressure oil pipe.

[0023] 5. By setting a one-way oil return throttle valve and a one-way oil inlet throttle valve, the opening or closing speed of the valve can be adjusted separately to meet production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is an overall schematic diagram of this embodiment;

[0025] FIG2 is a schematic diagram of a first-position, second-position, four-way directional control valve in this embodiment;

[0026] FIG3 is a schematic diagram of a second two-position four-way reversing valve in this embodiment;

[0027] FIG4 is a schematic diagram of a third two-position four-way reversing valve in this embodiment;

[0028] FIG5 is a schematic diagram of a three-position four-way reversing valve in this embodiment.

[0029] Explanation of the reference numerals: 1, 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, one-way return oil throttle valve; 41, one-way inlet oil 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 Valve; 63, third two-position four-way reversing valve; 71, hydraulic cylinder; 711, spring; 712, adjusting screw; 713, air filter; 81, first one-way valve; 82, second one-way valve; 83, third one-way valve; 91, hydraulic hose; 101, first cartridge valve; 102, second cartridge valve; 111, first hydraulically controlled one-way valve; 112, second hydraulically controlled one-way valve; 120, valve station; 130, pressure oil pipe; 140, return oil pipe; 150, drain oil pipe; 160, quick return oil pipe. DETAILED DESCRIPTION

[0030] 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.

[0031] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0032] A hydraulic system for safe and quick valve opening or closing includes a hydraulic cylinder 71 with an adjustable spring 711, a pressure oil pipe 130, an oil return pipe 140, an oil drain pipe 150, a quick oil return pipe 160, and a valve station 120. The hydraulic cylinder 71 has a single oil inlet and outlet located on the rod chamber side of the hydraulic cylinder 71. A drain port is provided on the rodless chamber side. When the valve is rapidly actuated, the spring force of the internal spring 711 in the hydraulic cylinder 71 rapidly extends the piston rod, causing the hydraulic oil in the rod chamber to quickly return, thereby actuating the valve for rapid opening or closing.

[0033] An adjustment screw 712 is located on the rodless cavity side of hydraulic cylinder 71. This adjusts the pre-compression of spring 711, specifically the total compression of spring 711 when the valve is fully closed (opened). This in turn adjusts the force of spring 711 during "quick opening" (quick closing) of the valve, thereby regulating the speed of "quick opening" (quick closing) to meet production requirements. A pipe can be installed on the rodless cavity side of hydraulic cylinder 71, connecting to an oil drain pipe 150. This drain pipe 150 is connected to the pump station tank to promptly drain any hydraulic oil that enters the rodless cavity back to the tank. An air filter 713 is located at the highest point of the rodless cavity end of hydraulic cylinder 71. When the piston rod of hydraulic cylinder 71 extends, air is filtered by air filter 713 before entering hydraulic cylinder 71. When the piston rod of hydraulic cylinder 71 retracts, air is exhausted from air filter 713, preventing negative pressure or pressure buildup within the rodless cavity of hydraulic cylinder 71 and ensuring smoother operation. Furthermore, since the air entering the rodless cavity is filtered, dust and other particles are prevented from entering and damaging the hydraulic cylinder 71. The oil inlet and outlet ports of the rod chamber of the hydraulic cylinder 71 and the oil drain port of the rodless chamber are both connected to a hydraulic hose 91 to overcome the influence of the swing or vibration of the hydraulic cylinder 71 on the pipeline when the valve is actuated. At the same time, it can also avoid the need to dismantle the hard pipeline when disassembling the hydraulic cylinder 71, making inspection and maintenance more convenient.

[0034] Specifically, the valve station 120 is equipped with 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 a third two-position, four-way reversing valve 63. The valve station 120 is connected to a hydraulic pump station (not shown) via a pressure oil pipe 130, a return oil pipe 140, an oil drain pipe 150, and a quick return oil pipe 160. The hydraulic pump station provides pressurized oil for the various valve operations via the pressure oil pipe 130. A first pressure gauge assembly 11 is mounted on the pressure oil pipe 130 to monitor the pressure within the pressure oil pipe 130 at all times, ensuring that the pressure within the pressure oil pipe 130 remains within the normal operating range, thereby ensuring that the various valves or devices within the valve station 120 can operate normally. Oil return from valve actuation is returned to the pump station tank via return oil pipe 140. Leakage oil from various hydraulic valves and cylinder 71 is returned to the pump station tank via drain oil pipe 150. Rapid return oil from the "quick-open" valve action is returned to the pump station tank via a dedicated rapid return oil pipe 160. With the exception of pressure oil pipe 130, which always carries high-pressure power oil, all other oil pipes are low-pressure. Rapid return oil pipe 160 is designed to connect to a separate oil tank and maintain a return slope toward the tank. This prevents oil accumulation within rapid return oil pipe 160 and ensures rapid and unobstructed oil return.

[0035] The P port of the three-position, four-way directional valve 51 is connected to the pressure oil pipe 130, with the first hydraulic ball valve 21 connected between the P port and the pressure oil pipe 130. The T port is connected to the return oil pipe 140. The A port is blocked, and the B port is connected to the rod chamber of the hydraulic cylinder 71. The P port of the first two-position, four-way directional valve 61 is connected to the pressure oil pipe 130, the T port is connected to the return oil pipe 140, the A port is connected to the hydraulic control port of the first cartridge valve 101, and the B port is blocked. The P port of the second two-position, four-way directional valve 62 is connected to the pressure oil pipe 130, the T port is connected to the return oil pipe 140, the A port is connected to the hydraulic control port of the second cartridge valve 102, and the B port is blocked. The first two-position, four-way directional valve 61 and the first cartridge valve 101 form a valve group, and the second two-position, four-way directional valve 62 and the second cartridge valve 102 form a valve group. In this way, if any of the two-position, four-way directional valves loses power, opening the corresponding cartridge valve, the rod chamber pressure oil can be quickly discharged through the corresponding cartridge valve into the rapid oil return line 160, thereby achieving rapid opening or closing of the valve. The two valve groups serve as backup for each other, providing greater safety and reliability. In other embodiments, multiple valve groups can be provided, and the number of valve groups is not limited.

[0036] Furthermore, a first hydraulically controlled one-way valve 111 is connected between the P port of the three-position four-way reversing valve 51 and the first hydraulic ball valve 21. The hydraulic ports of the first hydraulically controlled one-way valve 111 are connected to the A port of the first two-position four-way reversing valve 61 and the A port of the second two-position four-way reversing valve 62, respectively. Because the hydraulic pump station often drives multiple valves or other equipment, the pressure oil pipe 130 must be maintained within the operating pressure range to ensure that other valves or equipment can operate normally. By providing the first hydraulically controlled one-way valve 111, when the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62 lose power, the first hydraulically controlled one-way valve 111 is connected to the return oil pipe 140 through the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62. The first hydraulically controlled one-way valve 111 then closes, blocking the pressure oil pipe 130 from entering the three-position four-way reversing valve 51 and causing pressure relief.

[0037] In addition, a first check valve 81 is provided between the hydraulic control port of the first hydraulically controlled check valve 111 and port A of the first two-position four-way reversing valve 61, and a second check valve 82 is provided between the hydraulic control port of the first hydraulically controlled check valve 111 and port A of the second two-position four-way reversing valve 62. Under normal conditions, the solenoids of the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62 should be energized or de-energized simultaneously, that is, simultaneously in the same valve position. However, if an electrical fault occurs, resulting in one energized and the other de-energized, or if the valve core becomes stuck, one of the two two-position four-way reversing valves may be in the left and right positions respectively. In this case, the provision of the first check valve 81 and the second check valve 82 prevents the pressurized oil in the pressure oil pipe 130 from flowing from the two-position four-way reversing valve in the left position through the two-position four-way reversing valve in the right position to the return oil pipe 140, causing pressure relief in the pressure oil pipe 130.

[0038] Furthermore, a third one-way valve 83 is connected between the T port of the three-position four-way reversing valve 51 and the oil return pipe 140. The third one-way valve 83 prevents the hydraulic oil in the oil return pipe 140 from flowing back into the valve station 120 pipeline due to pressure fluctuations, causing the hydraulic valve to malfunction.

[0039] A second hydraulically-controlled check valve 112 is connected between the P port of the three-position, four-way directional valve 51 and the rodless chamber of the hydraulic cylinder 71. The P port of the third two-position, four-way directional valve 63 is connected to the pressure oil pipe 130, the T port is connected to the oil drain pipe 150, the A port is blocked, and the B port is connected to the hydraulic control port of the second hydraulically-controlled check valve 112. By configuring the second hydraulically-controlled check valve 112, when the valve is rapidly opening (or closing), the third two-position, four-way directional valve 63 loses power, the hydraulic control port of the second hydraulically-controlled check valve 112 is connected to the oil drain pipe 150, and the second hydraulically-controlled check valve 112 closes. At this time, even if an electrical failure occurs in the three-position four-way reversing valve 51 or the valve core is stuck, causing the three-position four-way reversing valve 51 to be located in the left valve position, or the first hydraulically controlled one-way valve 111 leaks or opens by mistake, the pressure oil in the pressure oil pipe 130 will not leak to the quick return oil pipe 160 through the first cartridge valve 101 or the second cartridge valve 102, causing the pressure of the pressure oil pipe 130 to be depressurized, thereby ensuring the safety and reliability of the system.

[0040] Furthermore, a return oil throttle valve 31, a feed oil throttle valve 41, a second pressure gauge assembly 12, a second hydraulic ball valve 22, a third pressure gauge assembly 13, and a third hydraulic ball valve 23 are sequentially connected between the second hydraulically controlled check valve 112 and the rod chamber of the hydraulic cylinder 71. The check valve in the return oil throttle valve 31 and the check valve in the feed oil throttle valve 41 operate in opposite directions, thereby regulating the oil flow rate into and out of the rod chamber of the hydraulic cylinder 71 and, consequently, the speed at which the valve opens or closes. A fourth pressure gauge assembly 14 and a fourth hydraulic ball valve 24 are sequentially installed on the pipelines connecting the first and second cartridge valves 101, 102 to the rod chamber of the hydraulic cylinder 71. The oil drain port on the non-rod chamber side of the hydraulic cylinder 71 is connected to an oil drain pipe 150, with a fifth pressure gauge assembly 15 and a fifth hydraulic ball valve 25 connected between them. The provision of multiple pressure gauge assemblies facilitates troubleshooting by pressure measurement during maintenance. By setting up multiple hydraulic ball valves, they are normally open during normal operation and closed during maintenance to cut off the hydraulic oil and facilitate maintenance.

[0041] In this embodiment, the piston rod of the hydraulic cylinder 71 extends, and the corresponding valve is driven to open; the piston rod of the hydraulic cylinder 71 contracts, and the corresponding valve is driven to close. In other embodiments, it can be set so that the piston rod of the hydraulic cylinder 71 extends, and the corresponding valve is driven to close, and the piston rod of the hydraulic cylinder 71 contracts, and the corresponding valve is driven to open. In this embodiment, Table 1 is a meter of gains and losses of electromagnets corresponding to valve actions. It should be noted that, among them, 1DT 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; 3DT is the electromagnet for the left valve position of the third two-position four-way reversing valve 63; 4DT and 5DT are the electromagnets for the left and right valve positions of the three-position four-way reversing valve 51, respectively.

[0042] Table 1: Valve action corresponding to the electromagnet power gain and loss table ("+" indicates power on, "-" indicates power off)

[0043] 1. Hydraulic cylinder 71 drives the valve to close normally:

[0044] Electromagnets 1DT, 2DT, 3DT, and 4DT are energized, and 5DT is de-energized. The first two-position four-way reversing valve 61, the second two-position four-way reversing valve 62, and the third two-position four-way reversing valve 63 are all in the left valve position, and the three-position four-way reversing valve 51 is in the left valve position. At this time: the pressure oil in the pressure oil pipe 130 enters the hydraulic control port of the second hydraulically controlled one-way valve 112 through the third two-position four-way reversing valve 63, thereby opening the second hydraulically controlled one-way valve 112; the pressure oil in the pressure oil pipe 130 enters the hydraulic control port of the first hydraulically controlled one-way valve 111 through the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62, thereby opening the first hydraulically controlled one-way valve 111; at the same time, the pressure oil passes to the hydraulic control ports of the first cartridge valve 101 and the second cartridge valve 102, the first cartridge valve 101 and the second cartridge valve 102 are closed, and the pressure oil in the rod chamber of the hydraulic cylinder 71 cannot leak to the quick return oil pipe 160 through the first cartridge valve 101 and the second cartridge valve 102.

[0045] Therefore, the pressurized oil in pressure oil pipe 130 can enter the rod chamber of hydraulic cylinder 71 through first hydraulic ball valve 21, first hydraulically controlled one-way valve 111, three-position four-way reversing valve 51, second hydraulically controlled one-way valve 112, one-way return oil throttle valve 31, one-way inlet oil throttle valve 41, second hydraulic ball valve 22, and third hydraulic ball valve 23, driving the piston rod to retract and compressing spring 711. At this point, the valve is normally closed. Adjusting the one-way inlet throttle valve 41 can adjust the oil flow rate entering the rod chamber of hydraulic cylinder 71, thereby adjusting the speed at which the valve normally closes.

[0046] 2. Hydraulic cylinder 71 drives the valve to open normally:

[0047] Electromagnets 1DT, 2DT, 3DT, and 5DT are energized, and 4DT is de-energized. The first two-position four-way reversing valve 61, the second two-position four-way reversing valve 62, and the third two-position four-way reversing valve 63 are all in the left valve position, and the three-position four-way reversing valve 51 is in the right valve position. At this time, the pressure oil in the pressure oil pipe 130 enters the hydraulic port of the second hydraulically controlled non-return valve 112 through the third two-position four-way reversing valve 63, thereby opening the second hydraulically controlled non-return valve 112. The pressure oil in the pressure oil pipe 130 passes through the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62 to the hydraulic ports of the first cartridge valve 101 and the second cartridge valve 102, so that the first cartridge valve 101 and the second cartridge valve 102 are closed, and the pressure oil in the rod chamber of the hydraulic cylinder 71 cannot leak into the quick return oil pipe 160 through the first cartridge valve 101 or the second cartridge valve 102. Although the pressure oil in the pressure oil pipe 130 also enters the hydraulic port of the first hydraulically controlled non-return valve 111 through the first two-position four-way reversing valve 61 and the first two-position four-way reversing valve 61, thereby opening the first hydraulically controlled non-return valve 111, the pressure oil will not leak out because the corresponding oil outlet A of the three-position four-way reversing valve 51 is blocked with a plug.

[0048] Therefore, the pressure oil in the rod chamber of hydraulic cylinder 71 is connected to the oil return pipe 140, the pressure oil is released, and spring 711 pushes the piston rod to extend. The hydraulic oil in the rod chamber then flows through the third hydraulic ball valve 23, the second hydraulic ball valve 22, the one-way oil inlet throttle valve 41, the one-way oil return throttle valve 31, the second hydraulically controlled one-way valve 112, the three-position four-way reversing valve 51, and the third one-way valve 83 to the oil return pipe 140. At this point, the valve is normally open. The one-way oil return throttle valve 31 can be adjusted to adjust the return oil flow rate from the rod chamber of hydraulic cylinder 71, thereby adjusting the speed at which the valve normally opens.

[0049] 3. Hydraulic cylinder 71 drives the valve to maintain its normal position:

[0050] When the valve is opened or closed in place or in the middle position, if the position needs to be kept unchanged, the hydraulic cylinder 71 will not move. At this time, the electromagnets 1DT and 2DT are energized, and 3DT, 4DT, and 5DT are de-energized, then 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, the third two-position four-way reversing valve 63 is in the right valve position, and the third four-way reversing valve 51 is in the middle valve position. At this time: the hydraulic control port of the second hydraulically controlled one-way valve 112 is connected to the oil drain pipe 150 through the third two-position four-way reversing valve 63, then the second hydraulically controlled one-way valve 112 is closed; the pressure oil in the pressure oil pipe 130 is passed through the first two-position four-way reversing valve 61 and the second two-position four-way reversing valve 62 to the hydraulic control ports of the first cartridge valve 101 and the second cartridge valve 102, so that the first cartridge valve 101 and the second cartridge valve 102 are closed, then the pressure oil in the rod chamber of the hydraulic cylinder 71 is not It can be discharged to the quick return oil pipe 160 through the first cartridge valve 101 or the second cartridge valve 102; although the pressure oil in the pressure oil pipe 130 also passes through the hydraulic control port of the first two-position four-way reversing valve 61, the second two-position four-way reversing valve 62 and the first hydraulic control check valve 111 to open the first hydraulic control check valve 111, but because the three-position four-way reversing valve 51 is in the middle valve position and the second hydraulic control check valve 112 is closed, the pressure oil will not enter the rod chamber of the hydraulic cylinder 71.

[0051] Therefore, the pressure oil in the rod cavity of the hydraulic cylinder 71 will not be depressurized or circulated, and the piston rod of the hydraulic cylinder 71 will be locked and immobilized, thereby maintaining the position of the valve.

[0052] 4. Hydraulic cylinder 71 drives the valve to open quickly:

[0053] Electromagnets 1DT, 2DT, 3DT, 4DT, and 5D are all de-energized, the first two-position four-way reversing valve 61, the second two-position four-way reversing valve 62, and the third two-position four-way reversing valve 63 are all in the right valve position, and the three-position four-way reversing valve 51 is in the middle valve position. At this time, the hydraulic control port of the second hydraulically controlled one-way valve 112 is connected to the oil drain pipe 150 through the third two-position four-way reversing valve 63, so that the second hydraulically controlled one-way valve 112 is closed; the hydraulic control port of the first hydraulically controlled one-way valve 111 is connected to the oil drain pipe 150 through the first two-position four-way reversing valve 61, the second two-position four-way reversing valve 62, and the oil drain pipe 150. The oil return pipe 140 is connected, and the first hydraulically controlled one-way valve 111 is closed; the hydraulic control port of the first cartridge valve 101 is connected to the oil return pipe 140 via the first two-position four-way reversing valve 61, and the hydraulic control port of the second cartridge valve 102 is connected to the oil return pipe 140 via the second two-position four-way reversing valve 62, so that the pressure oil in the rod cavity of the first cartridge valve 101 and the second cartridge valve 102 and the hydraulic cylinder 71 is relieved, and is discharged to the quick oil return pipe 160 through the first cartridge valve 101 and the second cartridge valve 102, and the spring 711 pushes the piston rod to extend quickly, so that the valve opens quickly.

[0054] Because the first and second cartridge valves 101, 102 have high flow capacities, the corresponding hydraulic cylinder 71, including the rod chamber, through the first and second cartridge valves 101, 102, to the quick oil return pipe 160, as well as the quick oil return pipe 160, are designed as large-diameter pipes. The quick oil return pipe 160 is designed to return to the pump station tank independently and is tilted, maintaining a slope toward the tank. This prevents oil accumulation within the pipe, ensuring smooth oil return and meeting quick-opening requirements. Furthermore, the quick-opening (quick-closing) action is designed to occur when all 1DT, 2DT, 3DT, 4DT, and 5DT valves are de-energized. This ensures that the valves will automatically and quickly open (close) in the event of a system power outage, protecting the system. Because the quick-opening (quick-closing) action is powered by spring 711, even if the hydraulic pump station fails and loses power, "quick opening" (quick closing) can be achieved, providing increased safety and reliability. Furthermore, since a first two-position four-way reversing valve 61 and a second two-position four-way reversing valve 62 are provided, as long as the electromagnet of any one of the two loses power and its valve core returns to the right valve position, the corresponding cartridge valve opens, and the pressure oil in the hydraulic cylinder 71 can be quickly discharged through the cartridge valve; even if an electrical failure occurs in the other reversing valve electromagnet or the reversing valve core is stuck, "quick opening" (quick closing) can be achieved, which is safer and more reliable.

[0055] 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 system for quickly opening or closing a valve safely, characterized in that: It includes a hydraulic cylinder with an adjustable spring, a pressure oil pipe, a return oil pipe, a drain pipe, a quick return oil pipe, and a valve platform; the oil inlet and outlet of the hydraulic cylinder are the same oil port, and are located on the side of the rod chamber of the hydraulic cylinder. The hydraulic cylinder drives the valve to open or close through the movement of the piston rod; a three-position four-way directional control valve and a first two-position four-way directional control valve are arranged in the valve platform; The P port of the three-position four-way directional control valve is connected to the pressure oil pipe, the T port is connected to the return oil pipe, the A port is blocked, and the B port is connected to the rod chamber of the hydraulic cylinder; a first cartridge valve is connected between the hydraulic cylinder and the quick return oil pipe; the P port of the first two-position four-way directional control valve is connected to the pressure oil pipe, the T port is connected to the return oil pipe, the A port is connected to the hydraulic control port of the first cartridge valve, and the B port is blocked.

2. The hydraulic system for quickly opening or closing a valve safely according to claim 1, characterized in that: A second two-position four-way directional control valve is further included in the valve platform, and a second cartridge valve connected in parallel with the first cartridge valve is connected between the hydraulic cylinder and the quick return oil pipe; the P port of the second two-position four-way directional control valve is connected to the pressure oil pipe, the T port is connected to the return oil pipe, the A port is connected to the hydraulic control port of the second cartridge valve, and the B port is blocked.

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

4. A hydraulic system for quickly opening or closing a valve safely according to claim 3, characterized in that: A first check valve is arranged between the hydraulic control port of the first hydraulic control check valve and the A port of the first two-position four-way directional control valve, and a second check valve is arranged between the hydraulic control port of the first hydraulic control check valve and the A port of the second two-position four-way directional control valve.

5. A hydraulic system for quickly opening or closing a valve safely according to claim 2, characterized in that: A third check valve is connected between the T port of the three-position four-way directional control valve and the return oil pipe, and the T ports of the first two-position four-way directional control valve and the second two-position four-way directional control valve are both connected to the return oil pipe through the third check valve.

6. A hydraulic system for quickly opening or closing a valve safely according to claim 1, characterized in that: A second hydraulic control check valve is connected between the B port of the three-position four-way directional control valve and the hydraulic cylinder; a third two-position four-way directional control valve is further arranged in the valve platform, the P port of the third two-position four-way directional control valve is connected to the pressure oil pipe, the T port is connected to the drain pipe, the A port is blocked, and the B port is connected to the hydraulic control port of the second hydraulic control check valve.

7. A hydraulic system for quickly opening or closing a valve safely according to claim 1 or 6, characterized in that: A one-way return oil throttle valve and a one-way inlet oil throttle valve are arranged in series between the three-position four-way directional control valve and the hydraulic cylinder.

8. A hydraulic system for quickly opening or closing a valve safely according to claim 1, characterized in that: A drain port is arranged in the rodless chamber of the hydraulic cylinder, and the drain port is connected to the drain pipe.

9. A hydraulic system for quickly opening or closing a valve safely according to claim 1, characterized in that: An air filter is arranged at the highest point at the end of the rodless chamber of the hydraulic cylinder.

10. A hydraulic 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 pump station oil tank, and the quick return oil pipe is inclined, and its inclined lower end faces the pump station oil tank.

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