Water inlet rapid gate differential loop

Abstract

The utility model relates to a water inlet fast gate differential loop. The method is suitable for the technical field of water conservancy and hydropower engineering. According to the technical scheme, the water inlet rapid gate differential loop comprises a hydraulic cylinder, a two-position three-way electromagnetic reversing valve with a lock, a differential valve and a hydraulic pump set. The two-position three-way electromagnetic directional valve with the lock comprises a traction electromagnet, a balancing weight, an unlocking electromagnet, an ingot locking mechanism and a two-position three-way directional valve body. A reversing valve core of the two-position three-way reversing valve is connected with the balancing weight; the locking mechanism is used for locking the reversing valve element in a lifting state, the locking mechanism unlocks the reversing valve element when the unlocking electromagnet is electrified, the balancing weight enables the reversing valve element to descend, a working opening of the two-position three-way reversing valve is connected with an oil tank through an oil return opening, the reversing valve element is lifted when the traction electromagnet is electrified, and the working opening is communicated with a hydraulic pump set through an oil inlet. The spindle locking mechanism is used for locking the spindle; the differential valve comprises a valve body, a differential valve element, a spring I and a cover plate.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy and hydropower engineering, in particular to a water inlet fast gate differential circuit. Background Art

[0002] The rapid gates at the water inlet of the units of water conservancy and hydropower projects are generally operated by hydraulic hoists. Their function is to close the orifices by the deadweight of the gate and the weight of the water column within a specified time when an accident occurs in the unit, water pump or flow channel to prevent the accident from expanding. The closed gate circuit is designed according to the condition that the AC power supply of the whole plant is lost and the hydraulic pump group cannot be started. Therefore, the hydraulic system adopts a differential circuit when closing the door. The differential circuit in the current project is composed of a two-position three-way electromagnetic reversing valve and a two-way cartridge valve. The two-way cartridge valve has two interfaces and a control port. One interface is connected to the rod chamber and the hydraulic pump group, and the other interface is connected to the rodless chamber. The control port is connected to the two-position three-way electromagnetic reversing valve. A spring is also installed on the valve core piston for resetting the valve core.

[0003] When the gate is fully open, the hydraulic system stops, the solenoid of the two-position three-way electromagnetic reversing valve loses power, and the pressure of the rod chamber acts on the upper and lower chambers of the two-way cartridge valve core piston. Since the upper chamber area of ​​the valve core piston is larger than the lower chamber area, the valve core is closed, and the rod chamber and the rodless chamber are blocked. When the gate needs to be closed, the solenoid of the two-position three-way electromagnetic reversing valve is energized, and the pressure oil of the two-way cartridge valve control port returns to the oil tank. The lower chamber force of the valve core piston overcomes the deadweight of the valve core and the spring force to open, and the rod chamber is connected with the rodless chamber, and the gate is closed. After the gate is fully closed, the weight of the gate and the weight of the water column are supported by the bottom sill of the gate. The rod chamber of the hydraulic cylinder is left with only the pressure generated by the weight of the piston rod and the weight of the water column acting on the water filling valve. In addition, this pressure must overcome the height difference between the throttling orifice plate and the oil inlet of the rodless chamber of the hydraulic cylinder and the liquid resistance generated by the corresponding pipeline, so that the pressure to keep the cartridge valve open almost disappears, and the valve core reset spring force will reset the valve core to the closed state. Therefore, for fast gates equipped with water filling valves, the closing time will be quite long, which has occurred many times in projects.

[0004] In order to solve this problem, some projects have adopted measures such as installing the cartridge valve core in the valve block in a horizontal state, using the valve core spring with the smallest restoring force, or even eliminating the valve core spring, and installing the differential circuit valve group next to the hydraulic cylinder, etc., and achieved good results. However, the valve group next to the cylinder is generally installed in the gate well, and the electromagnet of the two-position three-way electromagnetic reversing valve needs to be protected from moisture and rain, and direct current needs to be passed to the gate well, which increases the amount of engineering work. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies in the above-mentioned background technology and provide a fast gate differential circuit with a water inlet, which can realize the timely closing of the gate filling valve.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A water inlet fast gate differential circuit, comprising a hydraulic cylinder, a two-position three-way electromagnetic reversing valve with lock, a differential valve and a hydraulic pump group;

[0008] The two-position three-way electromagnetic reversing valve with lock comprises a traction electromagnet, a counterweight, an unlocking electromagnet, a locking mechanism, and a two-position three-way reversing valve; the reversing valve core of the two-position three-way reversing valve is connected to the counterweight;

[0009] The locking spindle mechanism is used to lock the reversing valve core in the lifting state. When the unlocking electromagnet is energized, the locking spindle mechanism releases the lock on the reversing valve core, and the counterweight block makes the reversing valve core drop. The working port of the two-position three-way reversing valve is connected to the oil tank through the oil return port. When the traction electromagnet is energized, the reversing valve core is lifted, and the working port is connected to the hydraulic pump group through the oil inlet. The locking spindle mechanism locks the spindle mechanism;

[0010] The differential valve includes a valve body, a differential valve core, a spring I and a cover plate. The differential valve core is installed in the valve cavity of the valve body. A large piston and two small pistons, one above and one below, are arranged on the differential valve core. Spring I is arranged on the bottom surface of the large piston for resetting it. The cover plate is installed at one end of the valve cavity close to the large piston and is provided with a control port, which is connected to the working port. The side wall of the valve cavity is provided with a first interface and a second interface which pass through the outer wall of the valve body. The first interface is connected to the hydraulic pump group. The second interface is located at the lower side of the first interface and is connected to the rod cavity of the hydraulic cylinder. The valve cavity is provided with a third interface connected to the rodless cavity of the hydraulic cylinder at the end away from the large piston. In the initial state, the first interface is closed, and the second interface is connected to the third interface. When the differential valve core overcomes the spring force and drops, the first interface and the second interface are connected, and the third interface is closed.

[0011] In a further solution, the traction electromagnet includes a moving iron core I, a traction coil, and a static iron core I, wherein the static iron core I is located on the upper side of the moving iron core I, and the lower end of the moving iron core I is connected to the reversing valve core of the two-position three-way reversing valve through a counterweight block;

[0012] The unlocking electromagnet is located above the traction electromagnet, and includes a static iron core II, an unlocking coil, a spring II, and a moving iron core II; the moving iron core II is arranged on the top rod and located on the upper side of the static iron core II, and the spring II is arranged between the moving iron core II and the static iron core II;

[0013] The locking mechanism comprises a piston rod, a steel ball, a spring III, and an iron core sleeve; the iron core sleeve is connected to the upper end of the moving iron core I and can slide in the static iron core I, the piston rod is slidably fitted in the iron core sleeve and a spring III is installed at the bottom, the outer wall of the piston rod is provided with a piston ring groove for accommodating the steel ball, and the iron core sleeve is provided with a plurality of openings that allow the steel ball to protrude outward by a certain distance but not fall out;

[0014] The traction coil is energized, the moving iron core Ⅰ is sucked up by the static iron core Ⅰ, and the steel ball protrudes from the opening under the action of the piston rod and the spring Ⅲ, locking the moving iron core Ⅰ and the iron core sleeve on the static iron core Ⅰ; at this time, the moving iron core Ⅰ of the two-position three-way reversing valve is lifted to the upper position, and the working port is connected to the hydraulic pump group through the oil inlet;

[0015] The unlocking coil is energized, the moving iron core II is sucked down by the static iron core II, the push rod presses down the piston rod, the steel ball slides into the piston ring groove, the lock spindle is released, and the moving iron core I falls down due to the action of the counterweight; at this time, the reversing valve core of the two-position three-way reversing valve is pressed to the lower position, and the working port is connected to the oil tank through the oil return port.

[0016] In a further scheme, the valve cavity is stepped, with the large piston installed on its large hole end, and two small pistons installed on the small hole end and the first interface, the second interface and the third interface are opened; in the initial state, the small piston on the upper side is located between the first interface and the large hole end, closing the channel between the large hole end and the first interface, and the small piston on the lower side is located between the first interface and the second interface; when the differential valve core overcomes the spring force and descends, the small piston on the upper side still closes the channel between the large hole end and the first interface, and the small piston on the lower side is lowered to the lower side of the second interface, opening the channel between the first interface and the second interface, and closing the third interface.

[0017] In a further scheme, when the gate is opened, the traction electromagnet is energized, and the electromagnetic suction force lifts the reversing valve core of the two-position three-way reversing valve to the upper position. At the same time, the locking mechanism automatically locks the spindle, and the working port of the two-position three-way reversing valve is connected to the oil inlet. The pressure oil from the hydraulic pump group acts on the large piston of the differential valve through the control port, and the differential valve core overcomes the spring force of spring I and moves downward, and the small piston on the lower side is lowered to the lower side of the second interface. The pressure oil from the hydraulic pump group enters the rod chamber of the hydraulic cylinder through the first interface and the second interface, and the oil in the rodless chamber of the hydraulic cylinder returns to the oil tank. After the gate is fully opened, the hydraulic pump group stops, and the pressure oil in the rod chamber of the hydraulic cylinder acts on the large piston through the oil inlet, working port and control port of the two-position three-way reversing valve, and the differential valve core remains in the lowered position, the rod chamber and the rodless chamber of the hydraulic cylinder are not connected, and the gate is held in the fully open position.

[0018] In a further scheme, when closing the gate, the unlocking electromagnet is energized, the locking mechanism releases the locked state, the reversing valve core is pressed to the lower position by the counterweight, the working port is connected to the oil return port, the differential valve core is reset under the action of spring I, the oil in the control port returns to the oil tank, the oil in the rod chamber of the hydraulic cylinder flows to the rodless chamber through the second interface and the third interface, and at the same time the oil tank replenishes oil to the rodless chamber, the gate is closed to the bottom threshold position, the spring force of spring I keeps the differential valve core in the reset state, so that the rod chamber and the rodless chamber remain connected, and the hydraulic pump group stops after the water filling valve is closed.

[0019] The beneficial effect of the utility model is that the utility model cooperates with the differential valve and the two-position three-way electromagnetic reversing valve with lock to form a differential circuit for use in the hydraulic system of the water inlet rapid gate, so that after the gate is closed to the bottom sill position, the rod chamber and the rodless chamber of the hydraulic cylinder can continue to be in a connected state, so that the gate filling valve can be closed in time, and then the orifice can be closed by the gate's own weight and the weight of the water column within a specified time, thereby preventing the accident from expanding and improving the safety performance of the water inlet rapid gate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is one of the schematic diagrams of the pipeline structure of an embodiment of the utility model, and the figure shows the state when the gate is opened.

[0021] Figure 2 This is the second schematic diagram of the pipeline structure of the embodiment of the utility model, which shows the state when the gate is closed.

[0022] Figure 3 It is a schematic diagram of the internal structure of the differential valve in the embodiment of the utility model.

[0023] Figure 4 This is a schematic diagram of the oil port status of a two-position three-way locked electromagnetic reversing valve in an embodiment of the utility model when the traction electromagnet is energized, and the locking spindle mechanism in the figure is in a locked spindle state.

[0024] Figure 5 This is a schematic diagram of the oil port status of a two-position three-way locked electromagnetic reversing valve in an embodiment of the utility model when the unlocking electromagnet is energized, and the locking spindle mechanism is in an unlocked state.

[0025] Figure 6 This is a schematic diagram of the internal structure of the traction electromagnet, the unlocking electromagnet, and the spindle locking mechanism in an embodiment of the utility model, in which the spindle locking mechanism is in a spindle locking state.

[0026] The figure includes: hydraulic cylinder 1, two-position three-way electromagnetic reversing valve with lock 2, differential valve 3, hydraulic pump group 4, cover plate 5, differential valve core 6, spring I7, valve body 8, valve chamber 9, large piston 10, small piston 11, traction electromagnet 12, counterweight 13, unlocking electromagnet 14, locking spindle mechanism 15, two-position three-way reversing valve 16, moving iron core I 17, control port 18, first interface 19, second interface 20, third interface 21, traction coil 22, static iron core I 23, static iron core II 24, unlocking coil 25, spring II 26, moving iron core II 27, piston rod 28, steel ball 29, spring III 30, iron core sleeve 31. DETAILED DESCRIPTION

[0027] In order to enable ordinary technicians in the field to more clearly understand the purpose, technical solutions and advantages of the utility model, the utility model is further explained below in conjunction with the accompanying drawings and embodiments, but the utility model is not limited to the following embodiments.

[0028] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] like Figure 1 As shown, the present embodiment provides a water inlet rapid gate differential circuit, comprising a hydraulic cylinder 1, a two-position three-way electromagnetic reversing valve with lock 2, a differential valve 3 and a hydraulic pump group 4.

[0030] like Figure 4 , Figure 5 As shown, the two-position three-way locked electromagnetic reversing valve 2 includes a traction electromagnet 12, a counterweight block 13, an unlocking electromagnet 14, a spindle locking mechanism 15, and a two-position three-way reversing valve 16. The two-position three-way reversing valve 16 has an oil inlet, an oil return port and a working port. A counterweight 13 is connected to the reversing valve core of the two-position three-way reversing valve 16. When the unlocking electromagnet 14 is energized, the locking mechanism 15 releases the lock on the reversing valve core of the two-position three-way reversing valve 16. The gravity of the counterweight 13 and the gravity of the reversing valve core itself cause the reversing valve core to descend. The working port of the two-position three-way reversing valve 16 is connected to the oil return port, and the oil return port is connected to the oil tank. When the traction electromagnet 12 is energized, its electromagnetic suction force causes the reversing valve core to overcome the counterweight 13 and its own gravity and lift up. The working port is connected to the oil inlet, and the oil inlet is connected to the hydraulic pump group 4. The locking mechanism is used to lock the reversing valve core in the lifted state. After the unlocking electromagnet 14 is energized, the locking mechanism releases the lock on the reversing valve core.

[0031] like Figure 3As shown, the differential valve 3 includes a valve body 8, a differential valve core 6, a spring I7 and a cover plate 5. The differential valve core 6 is installed in the valve cavity 9 of the valve body 8, and a large piston 10 and two small pistons 11 are arranged on the differential valve core 6. The spring I7 is arranged on the bottom surface of the large piston 10 for its reset. The cover plate 5 is installed at one end of the valve cavity 9 near the large piston 10 and is provided with a control port 18, which is connected to the working port. The side wall of the valve cavity 9 is provided with a first interface 19 and a second interface 20 that penetrates the outer wall of the valve body 8. The first interface 19 is connected to the hydraulic pump group 4, and the second interface 20 is located at the lower side of the first interface 19 and is connected to the rod chamber of the hydraulic cylinder 1. The valve cavity 9 is provided with a third interface 21 connected to the rodless chamber of the hydraulic cylinder 1 at one end away from the large piston 10. In the initial state, the first interface 19 is closed, and the second interface 20 is connected to the third interface 21. When the differential valve core 6 overcomes the spring force and descends, the first interface 19 and the second interface 20 are connected, and the third interface 21 is closed.

[0032] like Figure 3 As shown, the valve cavity 9 is stepped, with the large piston 10 installed at its large hole end, and two small pistons 11 installed at the small hole end and provided with the first interface 19, the second interface 20 and the third interface 21; in the initial state, the small piston 11 on the upper side is located between the first interface 19 and the large hole end, closing the passage between the large hole end and the first interface 19, and the small piston 11 on the lower side is located between the first interface 19 and the second interface 20; when the differential valve core 6 overcomes the spring force and descends, the small piston 11 on the upper side still closes the passage between the large hole end and the first interface 19, and the small piston 11 on the lower side is lowered to the lower side of the second interface 20, opening the passage between the first interface 19 and the second interface 20, and closing the third interface 21.

[0033] like Figure 6 As shown, the traction electromagnet 12 includes a moving iron core Ⅰ17, a traction coil 22, and a static iron core Ⅰ23. The static iron core Ⅰ23 is located on the upper side of the moving iron core Ⅰ17, and the lower end of the moving iron core Ⅰ17 is connected to the reversing valve core of the two-position three-way reversing valve 16 through the counterweight block 13.

[0034] The unlocking electromagnet 14 is located above the traction electromagnet 12, and includes a static iron core II 24, an unlocking coil 25, a spring II 26, and a moving iron core II 27. The moving iron core II 27 is arranged on the top rod and located on the upper side of the static iron core II 24, and the spring II 26 is arranged between the moving iron core II 27 and the static iron core II 24.

[0035] The locking mechanism 15 includes a piston rod 28, a steel ball 29, a spring III 30, and an iron core sleeve 31. The iron core sleeve 31 is connected to the upper end of the moving iron core I 17 and can slide in the static iron core I 23. The piston rod 28 is slidably fitted in the iron core sleeve 31 and the spring III 30 is installed at the bottom. The spring III 30 applies an upward thrust to the piston rod 28. The outer wall of the piston rod 28 is provided with a piston ring groove for accommodating the steel ball 29. The iron core sleeve 31 is provided with a plurality of openings (for example, 3 holes are provided to arrange 3 steel balls) that allow the steel balls to protrude a certain distance but not fall out.

[0036] The traction coil 22 is energized, the moving iron core Ⅰ17 is sucked up by the static iron core Ⅰ23, and the piston rod 28 is pushed upward by the spring Ⅲ30, and the steel ball 29 is pushed outward during the upward movement, so that the steel ball 29 protrudes from the opening for a distance and is stuck on the upper end of the static iron core Ⅰ23, thereby locking the moving iron core Ⅰ17 and the iron core sleeve 31 on the static iron core Ⅰ23. At this time, the moving iron core Ⅰ17 of the reversing valve core of the two-position three-way reversing valve 16 is raised to the upper position, and the working port is connected to the hydraulic pump group 4 through the oil inlet.

[0037] The unlocking coil 25 is energized, the moving iron core II 27 is sucked down by the static iron core II 24, the push rod presses down the piston rod 28, the steel ball 29 slides into the piston ring groove, the lock is released, and the moving iron core I 17 falls down under the action of the counterweight 13. At this time, the reversing valve core of the two-position three-way reversing valve 16 is pressed to the lower position, and the working port is connected to the oil tank through the oil return port.

[0038] like Figure 1 to Figure 6 As shown, when the gate is opened, the traction electromagnet 12 is energized, and the electromagnetic suction force raises the reversing valve core of the two-position three-way reversing valve 16 to the upper position, and the locking mechanism 15 automatically locks the spindle, and the working port of the two-position three-way reversing valve 16 is connected with the oil inlet, and the pressure oil from the hydraulic pump group 4 acts on the large piston 10 of the differential valve 3 through the control port 18, and the differential valve core 6 overcomes the spring force of the spring Ⅰ7 and moves downward, and the small piston 11 on the lower side is lowered to the lower side of the second interface 20, and the pressure oil from the hydraulic pump group 4 enters the rod chamber of the hydraulic cylinder 1 through the first interface 19 and the second interface 20, and the oil in the rodless chamber of the hydraulic cylinder 1 returns to the oil tank. After the gate is fully opened, the hydraulic pump group 4 stops, and the pressure oil in the rod chamber of the hydraulic cylinder 1 acts on the large piston 10 through the oil inlet, the working port, and the control port of the differential valve 3 of the two-position three-way reversing valve 16, and the differential valve core 6 remains in the descending position, the rod chamber and the rodless chamber of the hydraulic cylinder 1 are not connected, and the gate is held in the fully open position.

[0039] like Figure 1 to Figure 6As shown, when the gate is closed, the unlocking electromagnet 14 is energized, the locking mechanism releases the locked state, the reversing valve core is pressed to the lower position under the action of the counterweight 13, the working port is connected with the oil return port, the differential valve core 6 is reset under the action of the spring Ⅰ7, the oil in the control port 18 returns to the oil tank, the oil in the rod chamber of the hydraulic cylinder 1 flows to the rodless chamber through the second interface 20 and the third interface 21, and at the same time the oil tank replenishes oil to the rodless chamber, the gate is closed to the bottom threshold position, the spring force of the spring Ⅰ7 keeps the valve core of the differential valve 3 in the reset state, so that the rod chamber and the rodless chamber remain connected, and the hydraulic pump group 4 stops after the water filling valve is closed.

[0040] The differential valve 3 of this embodiment has the opposite effect to the valve core spring force of the existing two-way cartridge valve. When the pressure of the control port 18 of the differential valve 3 disappears, the spring force of the spring I7 keeps the differential valve core 6 in the upper position, and the rod chamber and the rodless chamber remain in a connected state. The differential valve 3 in this embodiment is combined with the two-position three-way electromagnetic reversing valve 2 with lock to form a differential circuit for the water inlet fast gate hydraulic system, which can enable the gate filling valve to be closed in time.

[0041] The above is only a preferred embodiment of the utility model. For those skilled in the art, the utility model can be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A water inlet fast gate differential circuit, characterized in that: It comprises a hydraulic cylinder (1), a two-position three-way electromagnetic reversing valve with lock (2), a differential valve (3) and a hydraulic pump group (4); The two-position three-way electromagnetic reversing valve (2) with lock comprises a traction electromagnet (12), a counterweight (13), an unlocking electromagnet (14), a spindle locking mechanism (15), and a two-position three-way reversing valve (16); the reversing valve core of the two-position three-way reversing valve (16) is connected to the counterweight (13). The locking mechanism (15) is used to lock the reversing valve core in the lifted state. When the unlocking electromagnet (14) is energized, the locking mechanism (15) releases the lock on the reversing valve core, and the counterweight (13) causes the reversing valve core to descend. The working port of the two-position three-way reversing valve (16) is connected to the oil tank through the oil return port. When the traction electromagnet (12) is energized, the reversing valve core is lifted, and the working port is connected to the hydraulic pump group (4) through the oil inlet port. The differential valve (3) comprises a valve body (8), a differential valve core (6), a spring I (7) and a cover plate (5). The differential valve core (6) is installed in a valve cavity (9) of the valve body (8). A large piston (10) and two small pistons (11) are arranged on the differential valve core (6). The spring I (7) is arranged on the bottom surface of the large piston (10) for resetting the large piston. The cover plate (5) is installed at one end of the valve cavity (9) where the large piston (10) is located and is provided with a control port (18). The control port (18) is connected to the working port of the two-position three-way reversing valve (16). The side wall of the valve cavity (9) is provided with a control port (18) which passes through the valve body (16). 8) a first interface (19) and a second interface (20) on the outer wall, the first interface (19) being connected to the hydraulic pump group (4), the second interface (20) being located at the lower side of the first interface (19) and connected to the rod chamber of the hydraulic cylinder (1), and the valve chamber (9) being provided with a third interface (21) connected to the rodless chamber of the hydraulic cylinder (1) at the end away from the large piston (10); in an initial state, the first interface (19) is closed, and the second interface (20) is connected to the third interface (21); when the differential valve core (6) overcomes the spring force and descends, the first interface (19) and the second interface (20) are connected, and the third interface (21) is closed.

2. A water inlet fast gate differential circuit according to claim 1, characterized in that: The traction electromagnet (12) comprises a moving iron core I (17), a traction coil (22), and a stationary iron core I (23), wherein the stationary iron core I (23) is located on the upper side of the moving iron core I (17), and the lower end of the moving iron core I (17) is connected to the reversing valve core of the two-position three-way reversing valve (16) through a counterweight block (13); The unlocking electromagnet (14) is located above the traction electromagnet (12), and comprises a static iron core II (24), an unlocking coil (25), a spring II (26), and a moving iron core II (27); the moving iron core II (27) is arranged on the top rod and located on the upper side of the static iron core II (24), and the spring II (26) is arranged between the moving iron core II (27) and the static iron core II (24); The locking mechanism (15) comprises a piston rod (28), a steel ball (29), a spring III (30), and an iron core sleeve (31); the iron core sleeve (31) is connected to the upper end of the moving iron core I (17) and can slide in the static iron core I (23); the piston rod (28) is slidably fitted in the iron core sleeve (31) and the spring III (30) is installed at the bottom; the outer wall of the piston rod (28) is provided with a piston ring groove for accommodating the steel ball (29); and the iron core sleeve (31) is provided with a plurality of openings that allow the steel ball to protrude outward by a certain distance but not fall out; The traction coil (22) is energized, the moving iron core I (17) is attracted by the stationary iron core I (23), and the steel ball (29) protrudes from the opening under the action of the piston rod (28) and the spring III (30), locking the moving iron core I (17) and the iron core sleeve (31) on the stationary iron core I (23); at this time, the moving iron core I (17) of the reversing valve core of the two-position three-way reversing valve (16) is raised to the upper position, and the working port is connected to the hydraulic pump group (4) through the oil inlet; The unlocking coil (25) is energized, the moving iron core II (27) is sucked down by the static iron core II (24), the push rod presses down the piston rod (28), the steel ball (29) slides into the piston ring groove, the lock is released, and the moving iron core I (17) falls down under the action of the counterweight (13); at this time, the reversing valve core of the two-position three-way reversing valve (16) is pressed to the lower position, and the working port is connected to the oil tank through the oil return port.

3. A water inlet fast gate differential circuit according to claim 1, characterized in that: The valve cavity (9) is stepped, with the large hole end being equipped with the large piston (10), and the small hole end being equipped with two small pistons (11) and provided with the first interface (19), the second interface (20) and the third interface (21); in an initial state, the small piston (11) on the upper side is located between the first interface (19) and the large hole end, closing the passage between the large hole end and the first interface (19), and the small piston (11) on the lower side is located between the first interface (19) and the second interface (20); when the differential valve core (6) overcomes the spring force and descends, the small piston (11) on the upper side still closes the passage between the large hole end and the first interface (19), and the small piston (11) on the lower side descends to the lower side of the second interface (20), opening the passage between the first interface (19) and the second interface (20), and closing the third interface (21).

4. A water inlet fast gate differential circuit according to claim 1, 2 or 3, characterized in that: When the gate is opened, the traction electromagnet (12) is energized, and the electromagnetic suction force lifts the reversing valve core of the two-position three-way reversing valve (16) to the upper position. At the same time, the locking mechanism (15) automatically locks the reversing valve core. The working port of the two-position three-way reversing valve (16) is connected to the oil inlet. The pressure oil from the hydraulic pump group (4) acts on the large piston (10) of the differential valve (3) through the control port (18). The differential valve core (6) overcomes the spring force of the spring I (7) and moves downward. The small piston (11) on the lower side is lowered to the lower side of the second interface (20). The hydraulic pump The pressure oil from the group (4) enters the rod chamber of the hydraulic cylinder (1) through the first interface (19) and the second interface (20), and the oil in the rodless chamber of the hydraulic cylinder (1) returns to the oil tank. After the gate is fully opened, the hydraulic pump group (4) stops, and the pressure oil in the rod chamber of the hydraulic cylinder (1) acts on the large piston (10) through the oil inlet, working port and control port of the two-position three-way reversing valve (16), and the differential valve core (6) is kept in the descending position. The rod chamber and the rodless chamber of the hydraulic cylinder (1) are not connected, and the gate is held in the fully open position.

5. A water inlet fast gate differential circuit according to claim 4, characterized in that: When the gate is closed, the unlocking electromagnet (14) is energized, the locking mechanism releases the locking state, the reversing valve core is pressed to the lower position under the action of the counterweight (13), the working port is connected to the oil return port, the differential valve core (6) is reset under the action of the spring I (7), the oil in the control port (18) returns to the oil tank, the oil in the rod chamber of the hydraulic cylinder (1) flows to the rodless chamber through the second interface (20) and the third interface (21), and the oil tank replenishes oil to the rodless chamber, the gate is closed to the bottom threshold position, the spring force of the spring I (7) maintains the reset state of the valve core of the differential valve (3), so that the rod chamber and the rodless chamber remain in a connected state, and the hydraulic pump group (4) stops after the water filling valve is closed.

Images