An interlocking control device for controlling the rapid full opening and closing of loads

Abstract

An interlocking control device for controlling the rapid full opening and closing of a load comprises a load and a hydraulic system. The hydraulic system includes a pressure oil input port P and an oil return port O. The hydraulic system also includes three parallel control circuits, one end of each of the three control circuits being connected to the pressure oil input port P, and the other end of each of the three control circuits being connected to a first pressure transmitter. The first pressure transmitter is sequentially connected in series with a manual reversing valve and a second pressure transmitter, and then connected to the KA control oil output port and the KB control oil output port via a first two-way cartridge valve and a second two-way cartridge valve, respectively. The KA control oil output port and the KB control oil output port are connected to the load via the PA load adjustment control oil circuit and the PB load adjustment control oil circuit, respectively. The hydraulic device employs a triple-redundant control circuit. The solenoid valves in the three redundant control circuits are always energized. Load interlocking is controlled by simultaneous de-energization of all three solenoid valves. Failure of one solenoid valve does not affect the interlocking function of the device.

Description

Technical Field

[0001] The invention relates to an interlocking control device for controlling rapid full opening and closing of a load. Background Art

[0002] Electro-hydraulic control systems are widely used in some critical installations in the petrochemical industry to control the opening and closing of large, specialized valves. When the installation is operating normally, the valve opening is adjusted within a range of 0 to 100%. However, if an abnormality occurs, the valve must be quickly and fully closed (opened) to ensure the safety of the installation and personnel, and to minimize economic losses. This process of emergency control, also known as interlock control, is a critical functional requirement for electro-hydraulic control systems for specialized valves in petrochemical installations, requiring extremely high reliability.

[0003] In order to improve the reliability of the above-mentioned interlocking control, the electro-hydraulic interlocking control method of special valves has been updated several times, from the single solenoid valve power-on control interlocking to the single solenoid valve power-off control interlocking. The double solenoid valve power-off interlocking commonly used in the market now has low reliability. Its principle is to use two solenoid valves to control the load interlocking at the same time. The design concept is: if one of the two solenoid valves loses power and acts, the interlocking can be controlled. If one of the two solenoid valves fails, it will not affect the interlocking function. This interlocking control method is also called "two-choose-one" interlocking control. Summary of the Invention

[0004] The purpose of the present invention is to provide an interlocking control device for controlling the rapid full opening and closing of a load, so as to solve the problems in the above-mentioned background technology.

[0005] The technical solution adopted to achieve the above-mentioned purpose is an interlocking control device for controlling the rapid full opening and closing of a load, comprising a load and a hydraulic system, wherein the hydraulic system comprises a P pressure oil input port and an O return oil port, and the hydraulic system further comprises three parallel control circuits, one end of the three control circuits being connected to the P pressure oil input port, and the other end of the three control circuits being connected to a first pressure transmitter, the first pressure transmitter being connected in series with a manual reversing valve and a second pressure transmitter, and then respectively connected to the KA control oil output port and the KB control oil output port through a first two-way cartridge valve and a second two-way cartridge valve, the KA control oil output port and the KB control oil output port being connected to the load through a PA load regulating control oil circuit and a PB load regulating control oil circuit respectively; the control circuit comprises a two-position three-way electromagnetic reversing valve connected to the P pressure oil input port, the two-position three-way electromagnetic reversing valve being connected to a two-position three-way hydraulic reversing valve through a third pressure transmitter, the two-position three-way hydraulic reversing valve being connected in parallel with two one-way valves and then connected to the first pressure transmitter.

[0006] Furthermore, the O oil return port is connected to the oil drain port of the two-position three-way hydraulic reversing valve.

[0007] Furthermore, the first two-way cartridge valve and the second two-way cartridge valve are both hydraulically controlled one-way valves.

[0008] Furthermore, the hydraulic system further comprises a valve mounting plate, and the hydraulic components of the hydraulic system are all mounted on the valve mounting plate or inserted into the valve mounting plate.

[0009] Beneficial effects

[0010] Compared with the prior art, the present invention has the following advantages.

[0011] 1. The present invention adopts triple redundant control loops to improve control reliability;

[0012] 2. In the present invention, the three solenoid valves are always energized, and the load interlock is controlled by the simultaneous loss of power to the three solenoid valves. When one solenoid valve fails, the interlock function of the device is not affected;

[0013] 3. The present invention increases the testability of the interlocking control loop. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the hydraulic control principle of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] like Figure 1 As shown, an interlock control device for controlling the rapid full opening and closing of a load includes a load 8 and a hydraulic system. The hydraulic system includes a P pressure oil input port 41 and an O return oil port 42. The hydraulic system also includes three parallel control circuits 9. One end of the three control circuits 9 is connected to the P pressure oil input port 41, and the other end of the three control circuits 9 is connected to a first pressure transmitter 74. The first pressure transmitter 74 is sequentially connected in series with a manual reversing valve 4 and a second pressure transmitter 75, and then respectively passes through a first two-way cartridge valve 52 and a second two-way cartridge valve. 51 is connected to the KA control oil output port 61 and the KB control oil output port 62, and the KA control oil output port 61 and the KB control oil output port 62 are connected to the load 8 through the PA load regulation control oil circuit 81 and the PB load regulation control oil circuit 82 respectively; the control circuit 9 includes a two-position three-way electromagnetic reversing valve 1 connected to the P pressure oil input port 41, the two-position three-way electromagnetic reversing valve 1 is connected to the two-position three-way hydraulic reversing valve 2 via the third pressure transmitter 7, and the two-position three-way hydraulic reversing valve 2 is connected to the first pressure transmitter 74 after being connected in parallel with the two one-way valves 3.

[0018] The oil return port O 42 is connected to the oil drain port of the two-position three-way hydraulic reversing valve 2 .

[0019] The first two-way cartridge valve 52 and the second two-way cartridge valve 51 are both hydraulically controlled one-way valves.

[0020] The hydraulic system further comprises a valve mounting plate 6 , and the hydraulic components of the hydraulic system are all mounted on the valve mounting plate 6 or inserted into the valve mounting plate 6 .

[0021] In the present invention, the hydraulic system has a pressure oil input port (P) 41, an oil return port (O) 42, and control oil output ports (KA) and (KB) connected to the load adjustment control circuits (PA) and PB, respectively. The control circuit 9 comprises a two-position, three-way solenoid directional valve 1, a two-position, three-way hydraulic directional valve 2, two check valves 3, and a pressure transmitter 7. When the two-position, three-way solenoid directional valve 1 is energized, pressure oil flows through the two-position, three-way solenoid directional valve 1, first cross-controlling the opening of the two-position, three-way hydraulic directional valve 2. Then, it passes through the two-position, three-way hydraulic directional valve 2 and the check valve 3 to the input port of the manual reversing valve 4, where it controls the closing of the first two-way cartridge valve 52 and the second two-way cartridge valve 51. At this point, the load 8 is controlled by the pressure oil flowing through the PA and PB load adjustment control circuits, adjusting the control valve opening within a range of 0 to 100% without being affected by the interlocking device.

[0022] In a specific implementation of the present invention, there are three control circuits 9, designated as circuit 1, circuit 2, and circuit 3. The three control circuits 9 include three identical two-position, three-way solenoid directional valves 1, three identical two-position, three-way hydraulic directional valves 2, three identical pressure transmitters 7, and six one-way valves 3. The three two-position, three-way solenoid directional valves 1 are designated as solenoid directional valve 1.1, solenoid directional valve 1.2, and solenoid directional valve 1.3; the three two-position, three-way hydraulic directional valves 2 are designated as hydraulic directional valve 2.1, hydraulic directional valve 2.2, and hydraulic directional valve 2.3; the three pressure transmitters 7 are designated as pressure transmitter 7.1, pressure transmitter 7.2, and pressure transmitter 7.3; and the six one-way valves 3 are designated as one-way valve 3.1, one-way valve 3.2, one-way valve 3.3, one-way valve 3.4, one-way valve 3.5, and one-way valve 3.6.

[0023] When one of the three two-position, three-way solenoid directional valves loses power, as in the case of solenoid directional valve 1.1 in circuit 1, solenoid directional valve 1.1 reverses direction, connecting the output port to the oil return port O, and the pressure reaches zero. The spring in hydraulic directional valve 2.3 then reverses direction, leaving circuit 2 open. Circuit 1 is closed by check valve 3.2, and circuit 3 is closed by check valve 3.6. Since circuit 2 is open, pressurized oil flows through circuit 2 and the manual directional valve, closing the second and first two-way cartridge valves. The load is not affected by the interlocking device.

[0024] When any two of the three two-position three-way solenoid reversing valves lose power, take the solenoid reversing valve 1.1 in circuit 1 and the solenoid reversing valve 1.2 in circuit 2 as an example: the solenoid reversing valve 1.1 and the solenoid reversing valve 1.2 lose power and reverse, the output port is connected to the O return oil port, the pressure is zero, the hydraulic reversing valve 2.1 and the hydraulic reversing valve 2.3 reverse under the action of the spring. At this time, only the solenoid reversing valve 1.3 is energized to output pressure oil, but because the hydraulic reversing valve 2.3 reverses under the action of the spring, circuit 3 is in the cut-off state under the action of the check valve 3.6; the hydraulic reversing valve 2.2 of circuit 2 is in the normal working position, and due to the action of the check valve 3.4, circuit 2 is in the cut-off state; the hydraulic reversing valve 2.1 of circuit 1 is in the reversing position, the check valve 3.1 is connected, and the control oil ports of the second two-way cartridge valve and the first two-way cartridge valve are connected through the manual reversing valve and the check valve 3.6. .1 is connected to the O oil return port. At this time, the pressure oil at the P pressure oil input port pushes open the first two-way cartridge valve KA control oil output port and enters the load PA' chamber. The oil in the load PB' chamber pushes open the second two-way cartridge valve through the KB control oil output port and connects to the O oil return port. The load is quickly fully closed (fully opened) by the pressure oil in the PA' chamber.

[0025] When all three two-position, three-way solenoid directional valves lose power, their output ports are connected to the O oil return port. Springs activate the three two-position, three-way hydraulic directional valves, causing them to reverse direction. The control oil ports of the second and first two-way cartridge valves are then connected to the O oil return port via the manual reversing valve, check valves 3.1, 3.3, and 3.6. Pressure oil from the P pressure oil inlet pushes open the first two-way cartridge valve and the KA control oil outlet, entering the load's PA' chamber. Oil in the load's PB' chamber, through the KB control oil outlet, pushes open the second two-way cartridge valve and connects it to the O oil return port. The load is rapidly fully closed (fully opened) by the pressure oil in the PA' chamber.

[0026] Manually operating the device's manual reversing valve 4, the pressure oil at the P pressure oil inlet 41 flows directly through the manual reversing valve 4 to the control oil ports of the second two-way cartridge valve 51 and the first two-way cartridge valve 52. The second two-way cartridge valve 51 and the first two-way cartridge valve 52 remain closed, unaffected by the power supply to the two-position, three-way solenoid reversing valve 1. At this point, the power to the two-position, three-way solenoid reversing valve 1 can be turned on and off, and the pressure values at each measuring point are detected via the three third pressure transmitters 7, the first pressure transmitter 74, and the second pressure transmitter 75. Whether the pressure values meet the requirements can be used to determine whether the various circuits are functioning properly.

[0027] The present invention uses a valve mounting plate 6 as a base, and all hydraulic components are mounted on or inserted into the valve mounting plate 6. The three two-position, three-way solenoid reversing valves 1 are normally energized, and the interlock control device does not output pressurized oil. When any two or three of the two-position, three-way solenoid reversing valves 1 lose power simultaneously, pressurized oil is output to control the load to quickly fully close (fully open).

Claims

1. An interlocking control device for controlling the rapid full opening and closing of a load, comprising a load (8) and a hydraulic system, characterized in that: The hydraulic system includes a P pressure oil input port (41) and an O return oil port (42). The hydraulic system also includes three parallel control circuits (9). One end of the three control circuits (9) is connected to the P pressure oil input port (41), and the other end of the three control circuits (9) is connected to a first pressure transmitter (74). The first pressure transmitter (74) is sequentially connected in series with a manual reversing valve (4) and a second pressure transmitter (75), and then connected to a KA control oil output port (61) and a KB control oil output port (62) through a first two-way cartridge valve (52) and a second two-way cartridge valve (51). The KA control oil output port (61) and the KB control oil output port (62) are connected to a load (8) through a PA load adjustment control oil circuit (81) and a PB load adjustment control oil circuit (82). The control circuit (9) includes a P pressure oil input port (41) and an O return oil port (42). The pressure oil input port (41) is connected to a two-position three-way electromagnetic reversing valve (1), which is connected to a two-position three-way hydraulic reversing valve (2) via a third pressure transmitter (7), and the two-position three-way hydraulic reversing valve (2) is connected to the first pressure transmitter (74) after being connected in parallel with two one-way valves (3); the O return oil port (42) is connected to the oil drain port of the two-position three-way hydraulic reversing valve (2); the hydraulic system further includes a valve mounting plate (6), and the hydraulic components of the hydraulic system are all mounted on the valve mounting plate (6) or inserted into the valve mounting plate (6).

2. The interlocking control device for controlling the rapid full opening and closing of a load according to claim 1, characterized in that: The first two-way cartridge valve (52) and the second two-way cartridge valve (51) are both hydraulically controlled one-way valves.

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