An open hydraulic control system for variable-depth water intake and its control method

Abstract

An open hydraulic control system for variable-depth water intake, wherein the oil suction port and the oil discharge port of the hydraulic pump unit are both connected to the oil tank, and the oil pressure ports are respectively connected to the P1 port of the first reversing valve and the P2 port of the second reversing valve; the A1 port and the B1 port of the first reversing valve are respectively connected to the rodless cavities and the rod cavities of the four lifting cylinders; the oil inlet ports of the four explosion-proof equalizing valves are respectively connected to the four oil circuits between the rodless cavities of the four lifting cylinders and the A1 port of the first reversing valve, and the oil outlet ports are interconnected; the A2 port and the B2 port of the second reversing valve are respectively connected to the rod cavities of the upper latch cylinder and the lower latch cylinder; the oil inlet port of the overflow valve is connected to the oil circuit between the P2 port of the second reversing valve and the oil pressure port of the hydraulic pump unit, and the oil outlet port is connected to the T2 port of the second reversing valve; the rodless cavities of the upper latch cylinder and the lower latch cylinder are both connected to the oil circuit between the oil inlet port of the overflow valve and the oil pressure port of the hydraulic pump unit. This design has relatively high stability and safety.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control systems, and in particular to an open hydraulic control system for variable water layer water intake and its control method. Background Art

[0002] The hydraulic control system for variable water layer water intake is widely used in various movable aquaculture vessels. The hydraulic control system for variable water layer water intake is used to lift and lower the water intake pipeline of the aquaculture vessel to pump water at different water levels. The existing hydraulic control systems for variable water layer water intake mainly include control components such as variable pumps, safety valves, and reversing valves. A certain flow rate of hydraulic oil is output by the variable pump to drive the lifting cylinder to move, and the reversing valve is used to control the extension and retraction of the lifting cylinder and the pin cylinder, so as to control performance parameters such as the rise, fall, and speed of the variable water layer water intake platform.

[0003] The lifting and lowering of the water intake platform are both realized by the rising and falling actions of the ring beam in cooperation with the insertion and extraction of the pins. The action requirements of the four lifting cylinders are basically synchronized. When the main oil circuit at the outlet of the main pump is divided into four and reaches each lifting cylinder, due to different manufacturing precisions, assembly errors, and pipeline frictional losses of each lifting cylinder, the pressure and flow rate of each lifting cylinder will inevitably be inconsistent, resulting in the phenomenon of cylinder non-synchronization. If the synchronization of the cylinders is relatively poor, it will cause the ring beam to tilt severely, resulting in the phenomenon that the pins cannot be inserted into the pin holes synchronously when the pin cylinders work, which will cut the pile legs; at the same time, the water intake platform and the pile legs are connected by pins, and there is a risk that two groups of pins of the moving and fixed ring beam pins will be pulled out simultaneously. If all the pins are pulled out at the same time, the platform and the pile legs will lose connection and the platform will sink, resulting in serious consequences. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects and problems of poor stability and poor safety in the prior art, and to provide an open hydraulic control system for variable water layer water intake and its control method with relatively high stability and high safety.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] An open hydraulic control system for variable water layer water intake includes an oil tank, a hydraulic pump set, a first reversing valve, four lifting cylinders, four explosion-proof equalizing valves, a second reversing valve, an upper pin cylinder, a lower pin cylinder, and an overflow valve. The suction port of the hydraulic pump set is communicated with the oil tank, the oil discharge port of the hydraulic pump set is communicated with the oil tank, and the pressure oil port of the hydraulic pump set is communicated with the P1 port of the first reversing valve and the P2 port of the second reversing valve;

[0007] The A1 port of the first reversing valve is connected to the rodless chambers of the four lifting cylinders, the B1 port of the first reversing valve is connected to the rod chambers of the four lifting cylinders, the T1 port of the first reversing valve is connected to the fuel tank, the inlet ports of the four explosion-proof balancing valves are respectively connected to four oil circuits between the rodless chambers of the four lifting cylinders and the A1 port of the first reversing valve, and the outlet ports of the four explosion-proof balancing valves are interconnected;

[0008] The A2 port of the second reversing valve is connected to the rod chamber of the upper latch cylinder, the T2 port of the second reversing valve is connected to the fuel tank, the B2 port of the second reversing valve is connected to the rod chamber of the lower latch cylinder, the inlet port of the overflow valve is connected to the oil circuit between the P2 port of the second reversing valve and the pressure oil port of the hydraulic pump set, the outlet port of the overflow valve is connected to the T2 port of the second reversing valve, and the rodless chambers of the upper latch cylinder and the lower latch cylinder are both connected to the oil circuit between the inlet port of the overflow valve and the pressure oil port of the hydraulic pump set.

[0009] The variable water layer water intake open hydraulic control system further includes an inlet oil filter and a check valve. The inlet port of the inlet oil filter is connected to the pressure oil port of the hydraulic pump set, the outlet port of the inlet oil filter is connected to the inlet port of the check valve, and the outlet port of the check valve is connected to the P1 port of the first reversing valve and the P2 port of the second reversing valve.

[0010] The variable water layer water intake open hydraulic control system further includes a unloading valve group. The inlet port of the unloading valve group is connected to the oil circuit between the pressure oil port of the hydraulic pump set and the inlet port of the filter, and the outlet port of the unloading valve group is connected to the fuel tank.

[0011] The unloading valve group includes a pilot-operated overflow valve and a two-position two-way electromagnetic reversing valve. The inlet port of the pilot-operated overflow valve is connected to the oil circuit between the pressure oil port of the hydraulic pump set and the inlet port of the filter, the outlet port of the pilot-operated overflow valve is connected to the fuel tank, the inlet port of the two-position two-way electromagnetic reversing valve is connected to the hydraulic control port of the pilot-operated overflow valve, and the outlet port of the two-position two-way electromagnetic reversing valve is connected to the outlet port of the pilot-operated overflow valve.

[0012] The variable water layer water intake open hydraulic control system further includes a return oil filter and a cooler. The inlet port of the cooler is connected to the T1 port of the first reversing valve and the T2 port of the second reversing valve. The inlet port of the return oil filter is connected to the outlet port of the cooler, and the outlet port of the return oil filter is connected to the fuel tank.

[0013] The variable water layer water intake open hydraulic control system further includes a pressure reducing valve. The oil inlet of the pressure reducing valve is communicated with the oil outlet of the hydraulic pump set. The oil outlet of the pressure reducing valve is communicated with the oil inlet of the overflow valve. The oil drain port of the pressure reducing valve is communicated with the fuel tank. The rodless chambers of the upper latch cylinder and the lower latch cylinder are both communicated with the oil path between the oil inlet of the overflow valve and the oil outlet of the pressure reducing valve.

[0014] The variable water layer water intake open hydraulic control system further includes four two-way balance valves. One oil inlet of the four two-way balance valves is respectively communicated with four oil paths between the A1 port of the first directional control valve and the rodless chambers of the four lifting cylinders. The other oil inlet of the four two-way balance valves is respectively communicated with four oil paths between the B1 port of the first directional control valve and the rod chambers of the four lifting cylinders.

[0015] The variable water layer water intake open hydraulic control system further includes four safety valves. The oil inlets of the four safety valves are respectively communicated with the oil inlets of the four explosion-proof equalizing valves. The oil outlets of the four safety valves are all communicated with the fuel tank.

[0016] The variable water layer water intake open hydraulic control system further includes a stop valve and a pressure gauge. The oil inlet of the stop valve is respectively communicated with the A1 port, B1 port, T1 port of the first directional control valve, the A2 port, B2 port, P2 port, T2 port of the second directional control valve. The pressure gauge is communicated with the oil outlet of the stop valve.

[0017] A control method for a variable water layer water intake open hydraulic control system, the control method includes the following steps:

[0018] S1. First, start the hydraulic pump set, control the A2 port and the P2 port of the second directional control valve to be communicated, and the B2 port and the T2 port to be communicated. The hydraulic oil sucked by the hydraulic pump set from the fuel tank sequentially passes through the P2 port and the A2 port and then enters the rod chamber of the upper latch cylinder, pushing the piston rod of the upper latch cylinder to retract. The piston rod of the upper latch cylinder drives the upper ring beam latch to be pulled out.

[0019] S2. When the piston rod of the upper latch cylinder retracts until the upper ring beam latch is completely pulled out, control the A1 port and the P1 port of the first directional control valve to be communicated, and the B1 port and the T1 port to be communicated. The hydraulic oil sequentially passes through the P1 port and the A1 port and then enters the rodless chambers of the four lifting cylinders respectively, and the piston rods of the four lifting cylinders extend simultaneously.

[0020] S3. When the piston rod of the lifting cylinder extends to a specified distance, control the T1 port of the first reversing valve to communicate with the A1 port and the B1 port. The hydraulic oil in the rod chamber of the lifting cylinder flows back to the fuel tank successively through the two-way balance valve, the A1 port, and the T1 port. The hydraulic oil in the rodless chamber of the lifting cylinder flows back to the fuel tank successively through the two-way balance valve, the B1 port, and the T1 port. At this time, the piston rod of the lifting cylinder is fixed. Then control the P2 port of the second reversing valve to communicate with the A2 port and the B2 port. The hydraulic oil enters the rod chamber of the upper pin cylinder successively through the overflow valve and the A2 port, and enters the rod chamber of the lower pin cylinder successively through the overflow valve and the B2 port. The hydraulic oil enters the rodless chambers of the upper pin cylinder and the lower pin cylinder simultaneously, pushing the piston rod of the upper pin cylinder to extend. At this time, both the upper ring beam pin and the lower ring beam pin are in the locked state;

[0021] S4. Control the B2 port of the second reversing valve to communicate with the P2 port, and the A2 port to communicate with the T2 port. The hydraulic oil sucked by the hydraulic pump set from the fuel tank enters the rod chamber of the lower pin cylinder successively through the P2 port and the B2 port, pushing the piston rod of the lower pin cylinder to retract. The piston rod of the lower pin cylinder drives the lower ring beam pin to be pulled out;

[0022] S5. When the piston rod of the lower pin cylinder retracts until the lower ring beam pin is completely pulled out, control the B1 port of the first reversing valve to communicate with the P1 port, and the A1 port to communicate with the T1 port. The hydraulic oil enters the rod chambers of the four lifting cylinders successively through the P1 port and the B1 port, and the piston rods of the four lifting cylinders retract simultaneously;

[0023] S6. When the piston rod of the lifting cylinder retracts to a specified distance, control the T1 port of the first reversing valve to communicate with the A1 port and the B1 port. The hydraulic oil in the rod chamber of the lifting cylinder flows back to the fuel tank successively through the two-way balance valve, the A1 port, and the T1 port. The hydraulic oil in the rodless chamber of the lifting cylinder flows back to the fuel tank successively through the two-way balance valve, the B1 port, and the T1 port. At this time, the piston rod of the lifting cylinder is fixed. Then control the P2 port of the second reversing valve to communicate with the A2 port and the B2 port. The hydraulic oil enters the rod chamber of the upper pin cylinder successively through the overflow valve and the A2 port, and enters the rod chamber of the lower pin cylinder successively through the overflow valve and the B2 port. The hydraulic oil enters the rodless chambers of the upper pin cylinder and the lower pin cylinder simultaneously, pushing the piston rod of the lower pin cylinder to extend. At this time, both the upper ring beam pin and the lower ring beam pin are in the locked state.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. In an open hydraulic control system for variable water layer water intake and its control method of the present invention, by arranging four explosion-proof balancing valves, the rodless chambers of the four lifting cylinders are connected in series with each other through the explosion-proof balancing valves. The explosion-proof balancing valve can change its position when the pressure in the rodless chamber of the cylinder is too high, and the hydraulic oil in the pipeline flows to the rodless chamber of the lifting cylinder with a smaller pressure until the pressure between the cylinders is balanced. At this time, the cylinder balancing valve is in the normally open state, and the rodless chambers of each lifting cylinder are connected again, and the pressure of each lifting cylinder is balanced, so that the four lifting cylinders can extend and retract synchronously, and the phenomenon of the ring beam tilting can be avoided. By arranging an overflow valve, when the second reversing valve is in the middle position, there is a pressure difference between the rodless chamber and the rodless chamber of the upper and lower pin cylinders, so that the upper and lower pin cylinders are kept in the extended state, and the upper and lower ring beam pins are in the inserted and locked state. When the second reversing valve works, when the upper pin is pulled out, the lower pin is in the locked state, and when the lower pin is pulled out, the upper pin is locked. Compared with the prior art, in any case, there is always a pin in the locked state, and the safety of the system is relatively high. Therefore, the present invention has relatively high stability and safety.

[0026] 2. In an open hydraulic control system for variable water layer water intake and its control method of the present invention, by arranging a unloading valve group, the pressure of the hydraulic oil output by the oil circuit where the hydraulic pump group is located can be controlled, preventing the hydraulic pressure from being too large and causing a large impact on the hydraulic system. The unloading valve group adopts a pilot-operated overflow valve and a two-position two-way electromagnetic reversing valve. By the energization and de-energization of the two-position two-way electromagnetic reversing valve, the unloading or loading of the hydraulic pump group can be controlled, and different pressure output requirements can be realized for each working condition of the variable water layer water intake system. Therefore, the present invention has relatively high stability and safety.

[0027] 3. In an open hydraulic control system for variable water layer water intake and its control method of the present invention, by arranging a safety valve, overload protection can be carried out on the lifting cylinder; by arranging a two-way balance valve, the self-locking function of the two-way balance valve enables the lifting cylinder to maintain its original position; by arranging a stop valve and a pressure gauge, the pressure of each oil circuit can be viewed through the pressure gauge, and the equipment in the faulty oil circuit can be repaired after closing the stop valve; by arranging a pressure reducing valve, the inlet oil pressure of the second reversing valve can be adjusted. Therefore, the present invention has relatively high stability and safety.

[0028] 4. In an open hydraulic control system for variable water layer water intake and its control method of the present invention, by arranging an inlet oil filter and a return oil filter, it is convenient to remove impurities in the hydraulic oil; by arranging a check valve, the reverse flow of the hydraulic oil can be prevented; by arranging a cooler, when the temperature of the hydraulic oil in the pipeline of the hydraulic system is too high, the stop valve in the cooler can be opened, and the hydraulic oil in the return oil pipeline can be cooled by the seawater circulation, so that the oil temperature in the hydraulic system is kept within a reasonable range. Therefore, the present invention has relatively high stability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram showing the principle of the open hydraulic control system for variable water layer water intake in the present invention.

[0030] Figure 2 It is a schematic connection diagram of the fuel tank, hydraulic pump unit, unloading valve unit, inlet oil filter, check valve, return oil filter, and cooler in the present invention.

[0031] Figure 3 It is a schematic structural diagram of the hydraulic pump unit in the present invention.

[0032] Figure 4 It is a schematic connection diagram of the unloading valve unit, inlet oil filter, and check valve in the present invention.

[0033] Figure 5 It is a schematic connection diagram of the return oil filter and cooler in the present invention.

[0034] Figure 6 It is a schematic connection diagram of the first reversing valve and the second reversing valve in the present invention.

[0035] Figure 7 It is a schematic connection diagram of the stop valve and the pressure gauge in the present invention.

[0036] Figure 8 It is a schematic connection diagram of the upper latch cylinder in the present invention.

[0037] Figure 9 It is a schematic connection diagram of the lower latch cylinder in the present invention.

[0038] Figure 10 It is a schematic connection diagram of the four lifting cylinders in the present invention.

[0039] Figure 11 It is a schematic connection diagram of the lifting cylinder, explosion-proof balance valve, two-way balance valve, and safety valve in the present invention.

[0040] In the figure: fuel tank 1, hydraulic pump unit 2, unloading valve unit 3, pilot-operated relief valve 31, two-position two-way solenoid valve 31, inlet oil filter 4, check valve 5, return oil filter 6, cooler 7, first reversing valve 8, pressure reducing valve 9, relief valve 10, second reversing valve 11, upper latch cylinder 12, lower latch cylinder 13, explosion-proof balance valve 14, two-way balance valve 15, safety valve 16, lifting cylinder 17, stop valve 18, pressure gauge 19. Detailed implementation manners

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0042] See Figures 1 to 11, a variable water layer water intake open hydraulic control system, including an oil tank 1, a hydraulic pump unit 2, a first reversing valve 8, four lifting cylinders 17, four explosion-proof balance valves 14, a second reversing valve 11, an upper pin cylinder 12, a lower pin cylinder 13, and a relief valve 10. The suction port of the hydraulic pump unit 2 is communicated with the oil tank 1, the oil discharge port of the hydraulic pump unit 2 is communicated with the oil tank 1, and the pressure oil port of the hydraulic pump unit 2 is communicated with the P1 port of the first reversing valve 8 and the P2 port of the second reversing valve 11;

[0043] The A1 port of the first reversing valve 8 is communicated with the rodless chambers of the four lifting cylinders 17, the B1 port of the first reversing valve 8 is communicated with the rod chambers of the four lifting cylinders 17, the T1 port of the first reversing valve 8 is communicated with the oil tank 1, and the oil inlet ports of the four explosion-proof balance valves 14 are respectively communicated with the oil circuits between the rodless chambers of the four lifting cylinders 17 and the A1 port of the first reversing valve 8, and the oil outlet ports of the four explosion-proof balance valves 14 are communicated with each other;

[0044] The A2 port of the second reversing valve 11 is communicated with the rod chamber of the upper pin cylinder 12, the T2 port of the second reversing valve 11 is communicated with the oil tank 1, the B2 port of the second reversing valve 11 is communicated with the rod chamber of the lower pin cylinder 13, the oil inlet port of the relief valve 10 is communicated with the oil circuit between the P2 port of the second reversing valve 11 and the pressure oil port of the hydraulic pump unit 2, the oil outlet port of the relief valve 10 is communicated with the T2 port of the second reversing valve 11, and the rodless chambers of the upper pin cylinder 12 and the lower pin cylinder 13 are both communicated with the oil circuit between the oil inlet port of the relief valve 10 and the pressure oil port of the hydraulic pump unit 2.

[0045] The variable water layer water intake open hydraulic control system further includes an oil inlet filter 4 and a check valve 5. The oil inlet port of the oil inlet filter 4 is communicated with the pressure oil port of the hydraulic pump unit 2, the oil outlet port of the oil inlet filter 4 is communicated with the oil inlet port of the check valve 5, and the oil outlet port of the check valve 5 is communicated with the P1 port of the first reversing valve 8 and the P2 port of the second reversing valve 11.

[0046] The variable water layer water intake open hydraulic control system further includes a unloading valve group 3. The oil inlet port of the unloading valve group 3 is communicated with the oil circuit between the pressure oil port of the hydraulic pump unit 2 and the oil inlet port of the filter 4, and the oil outlet port of the unloading valve group 3 is communicated with the oil tank 1.

[0047] The unloading valve group 3 includes a pilot-operated overflow valve 31 and a two-position two-way electromagnetic directional valve 32. The inlet port of the pilot-operated overflow valve 31 is connected to the oil circuit between the pressure oil port of the hydraulic pump group 2 and the inlet port of the filter 4. The outlet port of the pilot-operated overflow valve 31 is connected to the fuel tank 1. The inlet port of the two-position two-way electromagnetic directional valve 32 is connected to the hydraulic control port of the pilot-operated overflow valve 31, and the outlet port of the two-position two-way electromagnetic directional valve 32 is connected to the outlet port of the pilot-operated overflow valve 31.

[0048] The open hydraulic control system for variable water layer water intake further includes an oil return filter 6 and a cooler 7. The inlet port of the cooler 7 is connected to the T1 port of the first directional valve 8 and the T2 port of the second directional valve 11. The inlet port of the oil return filter 6 is connected to the outlet port of the cooler 7, and the outlet port of the oil return filter 6 is connected to the fuel tank 1.

[0049] The open hydraulic control system for variable water layer water intake further includes a pressure reducing valve 9. The inlet port of the pressure reducing valve 9 is connected to the pressure oil port of the hydraulic pump group 2. The outlet port of the pressure reducing valve 9 is connected to the inlet port of the overflow valve 10. The drain port of the pressure reducing valve 9 is connected to the fuel tank 1. The rodless chambers of the upper latch cylinder 12 and the lower latch cylinder 13 are both connected to the oil circuit between the inlet port of the overflow valve 10 and the pressure oil port of the pressure reducing valve 9.

[0050] The open hydraulic control system for variable water layer water intake further includes four bidirectional balance valves 15. One inlet port of the four bidirectional balance valves 15 is respectively connected to four oil circuits between the A1 port of the first directional valve 8 and the rodless chambers of the four lifting cylinders 17. The other inlet port of the four bidirectional balance valves 15 is respectively connected to four oil circuits between the B1 port of the first directional valve 8 and the rodless chambers of the four lifting cylinders 17.

[0051] The open hydraulic control system for variable water layer water intake further includes four safety valves 16. The inlet ports of the four safety valves 16 are respectively connected to the inlet ports of the four explosion-proof balance valves 14, and the outlet ports of the four safety valves 16 are all connected to the fuel tank 1.

[0052] The open hydraulic control system for variable water layer water intake further includes a stop valve 18 and a pressure gauge 19. The inlet port of the stop valve 18 is respectively connected to the A1 port, B1 port, T1 port of the first directional valve 8, the A2 port, B2 port, P2 port, T2 port of the second directional valve 11. The pressure gauge 19 is connected to the outlet port of the stop valve 18.

[0053] A control method for an open hydraulic control system for variable-depth water intake, the control method comprising the following steps:

[0054] S1. First, start the hydraulic pump unit 2, control the A2 port of the second reversing valve 11 to communicate with the P2 port, and the B2 port to communicate with the T2 port. The hydraulic oil sucked by the hydraulic pump unit 2 from the fuel tank 1 enters the rod chamber of the upper latch cylinder 12 in sequence through the P2 port and the A2 port, pushing the piston rod of the upper latch cylinder 12 to retract. The piston rod of the upper latch cylinder 12 drives the upper ring beam latch to be pulled out.

[0055] S2. When the piston rod of the upper latch cylinder 12 retracts until the upper ring beam latch is completely pulled out, control the A1 port of the first reversing valve 8 to communicate with the P1 port, and the B1 port to communicate with the T1 port. The hydraulic oil enters the rodless chambers of the four lifting cylinders 17 in sequence through the P1 port and the A1 port, and the piston rods of the four lifting cylinders 17 extend simultaneously.

[0056] S3. When the piston rods of the lifting cylinders 17 extend to a specified distance, control the T1 port of the first reversing valve 8 to communicate with the A1 port and the B1 port. The hydraulic oil in the rod chambers of the lifting cylinders 17 flows back to the fuel tank 1 in sequence through the two-way balance valve 15, the A1 port, and the T1 port. The hydraulic oil in the rodless chambers of the lifting cylinders 17 flows back to the fuel tank 1 in sequence through the two-way balance valve 15, the B1 port, and the T1 port. At this time, the piston rods of the lifting cylinders 17 are fixed. Then, control the P2 port of the second reversing valve 11 to communicate with the A2 port and the B2 port. The hydraulic oil enters the rod chamber of the upper latch cylinder 12 in sequence through the overflow valve 10 and the A2 port, and enters the rod chamber of the lower latch cylinder 13 in sequence through the overflow valve 10 and the B2 port. The hydraulic oil enters the rodless chambers of the upper latch cylinder 12 and the lower latch cylinder 13 simultaneously, pushing the piston rod of the upper latch cylinder 12 to extend. At this time, both the upper ring beam latch and the lower ring beam latch are in the locked state.

[0057] S4. Control the B2 port of the second reversing valve 11 to communicate with the P2 port, and the A2 port to communicate with the T2 port. The hydraulic oil sucked by the hydraulic pump unit 2 from the fuel tank 1 enters the rod chamber of the lower latch cylinder 13 in sequence through the P2 port and the B2 port, pushing the piston rod of the lower latch cylinder 13 to retract. The piston rod of the lower latch cylinder 13 drives the lower ring beam latch to be pulled out.

[0058] S5. When the piston rod of the lower latch cylinder 13 retracts until the lower ring beam latch is completely pulled out, control the B1 port of the first reversing valve 8 to communicate with the P1 port, and the A1 port to communicate with the T1 port. The hydraulic oil enters the rod chambers of the four lifting cylinders 17 in sequence through the P1 port and the B1 port, and the piston rods of the four lifting cylinders 17 retract simultaneously.

[0059] S6. When the piston rod of the lifting cylinder 17 retracts to a specified distance, control the T1 port of the first reversing valve 8 to communicate with the A1 port and the B1 port. The hydraulic oil in the rod chamber of the lifting cylinder 17 flows back to the fuel tank 1 in sequence through the two-way balance valve 15, the A1 port, and the T1 port. The hydraulic oil in the rodless chamber of the lifting cylinder 17 flows back to the fuel tank 1 in sequence through the two-way balance valve 15, the B1 port, and the T1 port. At this time, the piston rod of the lifting cylinder 17 is fixed. Then, control the P2 port of the second reversing valve 11 to communicate with the A2 port and the B2 port. The hydraulic oil enters the rod chamber of the upper pin cylinder 12 in sequence through the overflow valve 10 and the A2 port. The hydraulic oil enters the rod chamber of the lower pin cylinder 13 in sequence through the overflow valve 10 and the B2 port. The hydraulic oil enters the rodless chambers of the upper pin cylinder 12 and the lower pin cylinder 13 simultaneously, pushing the piston rod of the lower pin cylinder 13 to extend. At this time, both the upper ring beam pin and the lower ring beam pin are in the locked state.

[0060] The principle of the present invention is described as follows:

[0061] In the present invention, the output end of the upper pin cylinder 12 is connected to the upper ring beam pin, the output end of the lower pin cylinder 13 is connected to the lower ring beam pin, and the branch pipes of the four lifting cylinders 17 are connected to the ring pipe, and the length of each branch pipe is the same. After starting the hydraulic pump group 2, the hydraulic pump group 2 sucks oil from the fuel tank 1 through the oil suction port, and then the output pressure oil drives the upper pin cylinder 12 to move through the second reversing valve 11. The upper pin cylinder 12 drives the upper ring beam pin to be pulled out, and the lower ring beam pin remains inserted and locked. Then, the output pressure oil drives the lifting cylinder 17 to move through the first reversing valve 8. The lifting cylinder 17 extends to lower the platform. After reaching the specified height, the second reversing valve 11 drives the upper pin cylinder 12 to move in the reverse direction, and both the upper and lower ring beam pins are inserted and locked. When the platform needs to rise, the output pressure oil drives the lower pin cylinder 13 to move through the second reversing valve 11. The lower pin cylinder 13 drives the lower ring beam pin to be pulled out, and the upper ring beam pin remains inserted and locked. Then, the output pressure oil drives the lifting cylinder 17 to move through the first reversing valve 8. The lifting cylinder 17 extends to raise the platform. After reaching the specified height, the second reversing valve 11 drives the lower pin cylinder 13 to move, and both the upper and lower ring beam pins are inserted and locked. Repeating the above process realizes the lifting function of the variable water layer sampling platform.

[0062] Embodiment 1:

[0063] See Figures 1 to 11, a variable water layer water intake open hydraulic control system, comprising an oil tank 1, two groups of hydraulic pump sets 2, a first reversing valve 8, four lifting cylinders 17, four explosion-proof balance valves 14, a second reversing valve 11, four upper latch cylinders 12, four lower latch cylinders 13, and an overflow valve 10. The suction ports of the two groups of hydraulic pump sets 2 are respectively connected to the oil tank 1, the drain ports of the two groups of hydraulic pump sets 2 are respectively connected to the oil tank 1, and the pressure ports of the two groups of hydraulic pump sets 2 are connected to the P1 port of the first reversing valve 8 and the P2 port of the second reversing valve 11;

[0064] The A1 port of the first reversing valve 8 is connected to the rodless chambers of the four lifting cylinders 17, the B1 port of the first reversing valve 8 is connected to the rod chambers of the four lifting cylinders 17, the T1 port of the first reversing valve 8 is connected to the oil tank 1, the inlet ports of the four explosion-proof balance valves 14 are respectively connected to the oil circuits between the rodless chambers of the four lifting cylinders 17 and the A1 port of the first reversing valve 8, and the outlet ports of the four explosion-proof balance valves 14 are interconnected;

[0065] The A2 port of the second reversing valve 11 is connected to the rod chambers of the four upper latch cylinders 12, the T2 port of the second reversing valve 11 is connected to the oil tank 1, the B2 port of the second reversing valve 11 is connected to the rod chambers of the four lower latch cylinders 13, the inlet port of the overflow valve 10 is connected to the oil circuit between the P2 port of the second reversing valve 11 and the pressure port of the hydraulic pump set 2, the outlet port of the overflow valve 10 is connected to the T2 port of the second reversing valve 11, and the rodless chambers of the four upper latch cylinders 12 and the rodless chambers of the four lower latch cylinders 13 are both connected to the oil circuit between the inlet port of the overflow valve 10 and the pressure port of the hydraulic pump set 2.

[0066] The variable water layer water intake open hydraulic control system further includes two inlet filters 4 and two one-way valves 5. The inlet ports of the two inlet filters 4 are respectively connected to the pressure ports of the two groups of hydraulic pump sets 2, the outlet ports of the two inlet filters 4 are respectively connected to the inlet ports of the two one-way valves 5, and the outlet ports of the two one-way valves 5 are connected to the P1 port of the first reversing valve 8 and the P2 port of the second reversing valve 11.

[0067] The variable water layer water intake open hydraulic control system further includes two groups of unloading valve sets 3. The inlet ports of the unloading valve sets 3 are connected to the oil circuit between the pressure port of the hydraulic pump set 2 and the inlet port of the filter 4, and the outlet ports of the unloading valve sets 3 are connected to the oil tank 1.

[0068] The unloading valve group 3 includes a pilot-operated overflow valve 31 and a two-position two-way electromagnetic directional valve 32. The inlet port of the pilot-operated overflow valve 31 is connected to the oil circuit between the pressure oil port of the hydraulic pump group 2 and the inlet port of the filter 4. The outlet port of the pilot-operated overflow valve 31 is connected to the fuel tank 1. The inlet port of the two-position two-way electromagnetic directional valve 32 is connected to the hydraulic control port of the pilot-operated overflow valve 31. The outlet port of the two-position two-way electromagnetic directional valve 32 is connected to the outlet port of the pilot-operated overflow valve 31.

[0069] The open hydraulic control system for variable water layer water intake further includes an oil return filter 6 and a cooler 7. The inlet port of the cooler 7 is connected to the T1 port of the first directional valve 8 and the T2 port of the second directional valve 11. The inlet port of the oil return filter 6 is connected to the outlet port of the cooler 7. The outlet port of the oil return filter 6 is connected to the fuel tank 1.

[0070] The open hydraulic control system for variable water layer water intake further includes a pressure reducing valve 9. The inlet port of the pressure reducing valve 9 is connected to the pressure oil port of the hydraulic pump group 2. The outlet port of the pressure reducing valve 9 is connected to the inlet port of the overflow valve 10. The drain port of the pressure reducing valve 9 is connected to the fuel tank 1. The rodless chambers of the four upper latch cylinders 12 and the rodless chambers of the four lower latch cylinders 13 are both connected to the oil circuit between the inlet port of the overflow valve 10 and the pressure oil port of the pressure reducing valve 9.

[0071] The open hydraulic control system for variable water layer water intake further includes four two-way balance valves 15. One inlet port of the four two-way balance valves 15 is respectively connected to four oil circuits between the A1 port of the first directional valve 8 and the rodless chambers of the four lifting cylinders 17. The other inlet port of the four two-way balance valves 15 is respectively connected to four oil circuits between the B1 port of the first directional valve 8 and the rodless chambers of the four lifting cylinders 17.

[0072] The open hydraulic control system for variable water layer water intake further includes four safety valves 16. The inlet ports of the four safety valves 16 are respectively connected to the inlet ports of the four explosion-proof balance valves 14. The outlet ports of the four safety valves 16 are all connected to the fuel tank 1.

[0073] The open hydraulic control system for variable water layer water intake further includes a stop valve 18 and a pressure gauge 19. The inlet port of the stop valve 18 is respectively connected to the A1 port, B1 port, T1 port of the first directional valve 8, the A2 port, B2 port, P2 port, T2 port of the second directional valve 11. The pressure gauge 19 is connected to the outlet port of the stop valve 18.

[0074] A control method for an open hydraulic control system for variable-depth water intake, the control method comprising the following steps:

[0075] S1. First, start the hydraulic pump unit 2, control the A2 port and the P2 port of the second reversing valve 11 to be connected, and the B2 port and the T2 port to be connected. The hydraulic oil sucked by the hydraulic pump unit 2 from the fuel tank 1 sequentially passes through the P2 port and the A2 port and then enters the rod chamber of the upper pin cylinder 12, pushing the piston rod of the upper pin cylinder 12 to retract. The piston rod of the upper pin cylinder 12 drives the upper ring beam pin to be pulled out;

[0076] S2. When the piston rod of the upper pin cylinder 12 retracts until the upper ring beam pin is completely pulled out, control the A1 port and the P1 port of the first reversing valve 8 to be connected, and the B1 port and the T1 port to be connected. The hydraulic oil sequentially passes through the P1 port and the A1 port and then enters the rodless chambers of the four lifting cylinders 17 respectively, and the piston rods of the four lifting cylinders 17 extend simultaneously;

[0077] S3. When the piston rods of the lifting cylinders 17 extend to a specified distance, control the T1 port of the first reversing valve 8 to be connected to the A1 port and the B1 port. The hydraulic oil in the rod chambers of the lifting cylinders 17 sequentially passes through the two-way balance valve 15, the A1 port, and the T1 port and then returns to the fuel tank 1. The hydraulic oil in the rodless chambers of the lifting cylinders 17 sequentially passes through the two-way balance valve 15, the B1 port, and the T1 port and then returns to the fuel tank 1. At this time, the piston rods of the lifting cylinders 17 are fixed. Then, control the P2 port of the second reversing valve 11 to be connected to the A2 port and the B2 port. The hydraulic oil sequentially passes through the overflow valve 10 and the A2 port and enters the rod chamber of the upper pin cylinder 12. The hydraulic oil sequentially passes through the overflow valve 10 and the B2 port and enters the rod chamber of the lower pin cylinder 13. The hydraulic oil simultaneously enters the rodless chambers of the upper pin cylinder 12 and the lower pin cylinder 13, pushing the piston rod of the upper pin cylinder 12 to extend. At this time, both the upper ring beam pin and the lower ring beam pin are in the locked state;

[0078] S4. Control the B2 port of the second reversing valve 11 to be connected to the P2 port, and the A2 port to be connected to the T2 port. The hydraulic oil sucked by the hydraulic pump unit 2 from the fuel tank 1 sequentially passes through the P2 port and the B2 port and then enters the rod chamber of the lower pin cylinder 13, pushing the piston rod of the lower pin cylinder 13 to retract. The piston rod of the lower pin cylinder 13 drives the lower ring beam pin to be pulled out;

[0079] S5. When the piston rod of the lower pin cylinder 13 retracts until the lower ring beam pin is completely pulled out, control the B1 port of the first reversing valve 8 to be connected to the P1 port, and the A1 port to be connected to the T1 port. The hydraulic oil sequentially passes through the P1 port and the B1 port and then enters the rod chambers of the four lifting cylinders 17 respectively, and the piston rods of the four lifting cylinders 17 retract simultaneously;

[0080] S6. When the piston rod of the lifting cylinder 17 retracts to the specified distance, control the T1 port of the first directional control valve 8 to communicate with the A1 port and the B1 port. The hydraulic oil in the rod chamber of the lifting cylinder 17 flows back to the fuel tank 1 in sequence through the bi-directional balance valve 15, the A1 port, and the T1 port. The hydraulic oil in the rodless chamber of the lifting cylinder 17 flows back to the fuel tank 1 in sequence through the bi-directional balance valve 15, the B1 port, and the T1 port. At this time, the piston rod of the lifting cylinder 17 is fixed. Then, control the P2 port of the second directional control valve 11 to communicate with the A2 port and the B2 port. The hydraulic oil enters the rod chamber of the upper pin cylinder 12 in sequence through the overflow valve 10 and the A2 port. The hydraulic oil enters the rod chamber of the lower pin cylinder 13 in sequence through the overflow valve 10 and the B2 port. The hydraulic oil enters the rodless chambers of the upper pin cylinder 12 and the lower pin cylinder 13 simultaneously, pushing the piston rod of the lower pin cylinder 13 to extend. At this time, both the upper ring beam pin and the lower ring beam pin are in the locked state.

Claims

1. An open hydraulic control system for variable-depth water intake, characterized in that: It includes an oil tank (1), a hydraulic pump unit (2), a first reversing valve (8), four lifting cylinders (17), four explosion-proof balance valves (14), a second reversing valve (11), an upper latch cylinder (12), a lower latch cylinder (13), a relief valve (10), four two-way balance valves (15), and four safety valves (16). The suction port of the hydraulic pump unit (2) is communicated with the oil tank (1), the oil discharge port of the hydraulic pump unit (2) is communicated with the oil tank (1), and the pressure oil port of the hydraulic pump unit (2) is communicated with the P1 port of the first reversing valve (8) and the P2 port of the second reversing valve (11). The A1 port of the first reversing valve (8) is communicated with the rodless chambers of the four lifting cylinders (17), the B1 port of the first reversing valve (8) is communicated with the rod chambers of the four lifting cylinders (17), the T1 port of the first reversing valve (8) is communicated with the oil tank (1), the inlet ports of the four explosion-proof balance valves (14) are respectively communicated with four oil circuits between the rodless chambers of the four lifting cylinders (17) and the A1 port of the first reversing valve (8), and the outlet ports of the four explosion-proof balance valves (14) are communicated with each other. The A2 port of the second reversing valve (11) is communicated with the rod chamber of the upper latch cylinder (12), the T2 port of the second reversing valve (11) is communicated with the oil tank (1), the B2 port of the second reversing valve (11) is communicated with the rod chamber of the lower latch cylinder (13), the inlet port of the relief valve (10) is communicated with the oil circuit between the P2 port of the second reversing valve (11) and the pressure oil port of the hydraulic pump unit (2), the outlet port of the relief valve (10) is communicated with the T2 port of the second reversing valve (11), and the rodless chambers of the upper latch cylinder (12) and the lower latch cylinder (13) are both communicated with the oil circuit between the inlet port of the relief valve (10) and the pressure oil port of the hydraulic pump unit (2). One inlet port of the four two-way balance valves (15) is respectively communicated with four oil circuits between the A1 port of the first reversing valve (8) and the rodless chambers of the four lifting cylinders (17), and the other inlet port of the four two-way balance valves (15) is respectively communicated with four oil circuits between the B1 port of the first reversing valve (8) and the rod chambers of the four lifting cylinders (17). The inlet ports of the four safety valves (16) are respectively communicated with the inlet ports of the four explosion-proof balance valves (14), and the outlet ports of the four safety valves (16) are all communicated with the oil tank (1).

2. The open hydraulic control system for variable-depth water intake according to claim 1, characterized in that: The variable water layer water intake open hydraulic control system further includes an inlet oil filter (4) and a check valve (5). The inlet port of the inlet oil filter (4) is communicated with the pressure oil port of the hydraulic pump unit (2), the outlet port of the inlet oil filter (4) is communicated with the inlet port of the check valve (5), and the outlet port of the check valve (5) is communicated with the P1 port of the first reversing valve (8) and the P2 port of the second reversing valve (11).

3. The open hydraulic control system for variable-depth water intake according to claim 2, characterized in that: The variable water layer water intake open hydraulic control system further includes a unloading valve group (3). The oil inlet of the unloading valve group (3) is communicated with the oil circuit between the oil outlet of the hydraulic pump group (2) and the oil inlet of the filter (4). The oil outlet of the unloading valve group (3) is communicated with the oil tank (1).

4. The open hydraulic control system for variable-depth water intake according to claim 3, characterized in that: The unloading valve group (3) includes a pilot-operated overflow valve (31) and a two-position two-way electromagnetic reversing valve (32). The oil inlet of the pilot-operated overflow valve (31) is communicated with the oil circuit between the oil outlet of the hydraulic pump group (2) and the oil inlet of the filter (4). The oil outlet of the pilot-operated overflow valve (31) is communicated with the oil tank (1). The oil inlet of the two-position two-way electromagnetic reversing valve (32) is communicated with the hydraulic control port of the pilot-operated overflow valve (31). The oil outlet of the two-position two-way electromagnetic reversing valve (32) is communicated with the oil outlet of the pilot-operated overflow valve (31).

5. The open hydraulic control system for variable-depth water intake according to claim 1, characterized in that: The variable water layer water intake open hydraulic control system further includes a return oil filter (6) and a cooler (7). The oil inlet of the cooler (7) is communicated with the T1 port of the first reversing valve (8) and the T2 port of the second reversing valve (11). The oil inlet of the return oil filter (6) is communicated with the oil outlet of the cooler (7). The oil outlet of the return oil filter (6) is communicated with the oil tank (1).

6. The open hydraulic control system for variable-depth water intake according to claim 1, characterized in that: The variable water layer water intake open hydraulic control system further includes a pressure reducing valve (9). The oil inlet of the pressure reducing valve (9) is communicated with the oil outlet of the hydraulic pump group (2). The oil outlet of the pressure reducing valve (9) is communicated with the oil inlet of the overflow valve (10). The drain oil port of the pressure reducing valve (9) is communicated with the oil tank (1). The rodless cavities of the upper latch cylinder (12) and the lower latch cylinder (13) are both communicated with the oil circuit between the oil inlet of the overflow valve (10) and the oil outlet of the pressure reducing valve (9).

7. The open hydraulic control system for variable-depth water intake according to claim 1, characterized in that: The variable water layer water intake open hydraulic control system further includes a stop valve (18) and a pressure gauge (19). The oil inlet of the stop valve (18) is respectively communicated with the A1 port, B1 port, T1 port of the first reversing valve (8), the A2 port, B2 port, P2 port, T2 port of the second reversing valve (11). The pressure gauge (19) is communicated with the oil outlet of the stop valve (18).

8. A control method for the open hydraulic control system for variable-depth water intake according to claim 1, characterized in that: The variable water layer water intake open hydraulic control system further includes four bidirectional balance valves (15). One oil inlet of the four bidirectional balance valves (15) is respectively communicated with four oil circuits between the A1 port of the first reversing valve (8) and the rodless cavities of the four lifting cylinders (17). The other oil inlet of the four bidirectional balance valves (15) is respectively communicated with four oil circuits between the B1 port of the first reversing valve (8) and the rodless cavities of the four lifting cylinders (17). The control method includes the following steps: S1. First, start the hydraulic pump unit (2), control the A2 port and the P2 port of the second reversing valve (11) to be connected, and the B2 port and the T2 port to be connected. The hydraulic oil sucked by the hydraulic pump unit (2) from the fuel tank (1) enters the rod chamber of the upper latch cylinder (12) successively through the P2 port and the A2 port, pushing the piston rod of the upper latch cylinder (12) to retract. The piston rod of the upper latch cylinder (12) drives the upper ring beam latch to be pulled out. S2. When the piston rod of the upper latch cylinder (12) retracts until the upper ring beam latch is completely pulled out, control the A1 port and the P1 port of the first reversing valve (8) to be connected, and the B1 port and the T1 port to be connected. The hydraulic oil enters the rodless chambers of the four lifting cylinders (17) successively through the P1 port and the A1 port, and the piston rods of the four lifting cylinders (17) extend simultaneously. S3. When the piston rods of the lifting cylinders (17) extend to a specified distance, control the T1 port of the first reversing valve (8) to be connected with the A1 port and the B1 port. The hydraulic oil in the rod chamber of the lifting cylinder (17) flows back to the fuel tank (1) successively through the two-way balance valve (15), the A1 port, and the T1 port, and the hydraulic oil in the rodless chamber of the lifting cylinder (17) flows back to the fuel tank (1) successively through the two-way balance valve (15), the B1 port, and the T1 port. At this time, the piston rods of the lifting cylinders (17) are fixed. Then, control the P2 port of the second reversing valve (11) to be connected with the A2 port and the B2 port. The hydraulic oil enters the rod chamber of the upper latch cylinder (12) successively through the overflow valve (10) and the A2 port, and enters the rod chamber of the lower latch cylinder (13) successively through the overflow valve (10) and the B2 port. The hydraulic oil enters the rodless chambers of the upper latch cylinder (12) and the lower latch cylinder (13) simultaneously, pushing the piston rod of the upper latch cylinder (12) to extend. At this time, both the upper ring beam latch and the lower ring beam latch are in the locked state. S4. Control the B2 port and the P2 port of the second reversing valve (11) to be connected, and the A2 port and the T2 port to be connected. The hydraulic oil sucked by the hydraulic pump unit (2) from the fuel tank (1) enters the rod chamber of the lower latch cylinder (13) successively through the P2 port and the B2 port, pushing the piston rod of the lower latch cylinder (13) to retract. The piston rod of the lower latch cylinder (13) drives the lower ring beam latch to be pulled out. S5. When the piston rod of the lower latch cylinder (13) retracts until the lower ring beam latch is completely pulled out, control the B1 port and the P1 port of the first reversing valve (8) to be connected, and the A1 port and the T1 port to be connected. The hydraulic oil enters the rod chambers of the four lifting cylinders (17) successively through the P1 port and the B1 port, and the piston rods of the four lifting cylinders (17) retract simultaneously. S6. When the piston rod of the lifting oil cylinder (17) retracts to a specified distance, control the T1 port of the first directional control valve (8) to communicate with the A1 port and the B1 port. The hydraulic oil in the rod chamber of the lifting oil cylinder (17) flows back to the fuel tank (1) successively through the bi-directional balance valve (15), the A1 port, and the T1 port. The hydraulic oil in the rodless chamber of the lifting oil cylinder (17) flows back to the fuel tank (1) successively through the bi-directional balance valve (15), the B1 port, and the T1 port. At this time, the piston rod of the lifting oil cylinder (17) is fixed. Then control the P2 port of the second directional control valve (11) to communicate with the A2 port and the B2 port. The hydraulic oil enters the rod chamber of the upper pin oil cylinder (12) successively through the overflow valve (10) and the A2 port. The hydraulic oil enters the rod chamber of the lower pin oil cylinder (13) successively through the overflow valve (10) and the B2 port. The hydraulic oil enters the rodless chambers of the upper pin oil cylinder (12) and the lower pin oil cylinder (13) simultaneously, pushing the piston rod of the lower pin oil cylinder (13) to extend. At this time, both the upper ring beam pin and the lower ring beam pin are in the locked state.

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