Hydraulic hoist for miter gates capable of emergency operation under long-term flooding conditions

Abstract

The present invention relates to a hydraulic gate opening and closing machine for a miter gate that can be operated in an emergency under conditions of long-term flooding. The present invention is applicable to water conservancy and hydropower engineering and similar fields. The technical solution of the present invention is a hydraulic gate opening and closing machine for a miter gate that can be operated in an emergency under conditions of long-term flooding, which has a hydraulic cylinder and a hydraulic control system, and is characterized in that: the hydraulic control system includes an oil tank, a main reversing valve and an emergency operator, wherein the oil tank is connected to the main reversing valve via an oil supply pipeline equipped with a proportional variable pump, and the main reversing valve is respectively connected to the rod chamber and the rodless chamber of the hydraulic cylinder via a rod chamber pipeline and a rodless chamber pipeline, and the main reversing valve is also connected to the oil tank via an oil return pipeline; a balancing valve is provided on the rod chamber pipeline, and the control pipeline of the balancing valve is connected to the rodless chamber pipeline, and the balancing valve on the rod chamber pipeline can be reversely conducted under the action of the pressure oil in the rodless chamber pipeline.

Description

Technical Field

[0001] The invention relates to a hydraulic gate hoist capable of emergency operation under long-term flooding conditions, and is applicable to water conservancy and hydropower engineering and similar fields. Background Art

[0002] Miter gates are commonly used in ship locks on navigable rivers and are arranged at the upper and lower gate heads as working gates. The existing hydraulic gate hoists cannot work normally under conditions of long-term immersion in water, and cannot be operated in emergency conditions. The control accuracy of the hydraulic hoists is relatively low, and cannot meet the more complex operating conditions and more refined operation requirements of new water conservancy projects for the opening and closing of miter gates. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in view of the above-mentioned existing problems, a hydraulic gate opening and closing machine for a miter gate which can be operated in an emergency under long-term water immersion conditions is provided.

[0004] The technical solution adopted by the present invention is: a hydraulic gate hoist capable of emergency operation under long-term flooding conditions, having a hydraulic cylinder and a hydraulic control system, characterized in that: the hydraulic control system comprises an oil tank, a main reversing valve and an emergency operator, wherein the oil tank is connected to the main reversing valve via an oil supply pipeline equipped with a proportional variable pump, the main reversing valve is respectively connected to the rod chamber and the rodless chamber of the hydraulic cylinder via a rod chamber pipeline and a rodless chamber pipeline, and the main reversing valve is also connected to the oil tank via an oil return pipeline;

[0005] A balancing valve is provided on the rod cavity pipeline, and the control pipeline of the balancing valve is connected to the rodless cavity pipeline. The balancing valve on the rod cavity pipeline can conduct reversely under the action of the pressure oil in the rodless cavity pipeline; A balancing valve is provided on the rodless cavity pipeline, and the control pipeline of the balancing valve is connected to the rod cavity pipeline. The balancing valve on the rodless cavity pipeline can conduct reversely under the action of the pressure oil in the rod cavity pipeline;

[0006] The emergency operator has a manual reversing valve, and the oil tank is connected to the manual reversing valve via an emergency oil supply pipeline equipped with a plunger pump. The plunger pump is driven by a diesel engine. The manual reversing valve is respectively connected to the rod chamber and the rodless chamber of the hydraulic cylinder via an emergency rod chamber pipeline and an emergency rodless chamber pipeline. The manual reversing valve is also connected to the oil tank via an emergency oil return pipeline.

[0007] An oil replenishment branch and an overflow branch are arranged between the oil tank and the rod chamber and the rodless chamber of the hydraulic cylinder, wherein a one-way valve is arranged on the oil replenishment branch, and an overflow valve is arranged on the overflow branch.

[0008] A hydraulically controlled one-way valve is provided on the rod chamber pipeline, and the control pipeline of the hydraulically controlled one-way valve is connected to the overflow branch on the rod chamber of the hydraulic cylinder; a hydraulically controlled one-way valve is provided on the rodless chamber pipeline, and the control pipeline of the hydraulically controlled one-way valve is connected to the overflow branch on the rodless chamber of the hydraulic cylinder.

[0009] An overflow bypass is provided corresponding to the outlet of the plunger pump, and an emergency overflow valve is provided on the overflow bypass.

[0010] The emergency rod-cavity pipeline and the emergency rodless cavity pipeline are provided with speed regulating valves.

[0011] The piston rod of the hydraulic cylinder is a ceramic piston rod.

[0012] The hydraulic cylinder is equipped with an absolute waterproof stroke sensor based on a ceramic piston rod, which can provide a feedback signal for the control of the proportional variable pump.

[0013] A circle of U-shaped piston rod sealing ring with a U-shaped cross section is arranged on the cylinder body of the hydraulic cylinder.

[0014] The hydraulic cylinder is provided with a piston rod follower device, and the piston rod follower device is provided with a proximity switch corresponding to the fully open position and the fully closed position of the hydraulic cylinder.

[0015] The beneficial effects of the present invention are as follows: when the hydraulic control system is started, the present invention realizes synchronous deviation correction with higher precision by automatically adjusting the output displacement of the proportional variable pumps on the left and right banks of the miter gate; when the hydraulic control system is shut down, the balancing valves of the rod cavity pipeline and the rodless cavity pipeline are one-way locked, the oil in the hydraulic cylinder cannot be discharged freely, and the hydraulic cylinder can stably and reliably self-lock in both directions.

[0016] During the flood season, the hydraulic opening and closing machine of the miter gate in water conservancy projects may be immersed in water for a long time. The present invention replaces the conventional oil cylinder seal, conventional built-in stroke sensor and matching limit switch that cannot be immersed in water for a long time by arranging a piston rod U-shaped sealing ring, an absolute waterproof stroke sensor, a waterproof proximity switch and a piston rod follower device, so that the hydraulic opening and closing machine of the miter gate can work normally under the immersed condition.

[0017] In the case that the hydraulic hoist equipment loses the conventional power supply and the diesel engine emergency power supply, the present invention can perform emergency operation through the emergency operator to realize the emergency passage of ships through the navigable river lock. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the hydraulic control system in the embodiment.

[0019] Figure 2 It is a structural schematic diagram of the hydraulic cylinder in the invention.

[0020] Figure 3 for Figure 2 Enlarged view of part A in the middle.

[0021] Figure 4 2 is a cross-sectional view of a hydraulic cylinder in an embodiment.

[0022] 1. Proportional variable pump, 2. Main reversing valve, 3. Check valve, 4. Overflow valve, 5. Balance valve, 6. One-way throttle valve, 7. Hydraulic cylinder, 7-1. Ceramic piston rod, 8. Emergency operator, 8-1. Speed ​​control valve, 8-2. Manual reversing valve, 8-3. Diesel engine, 8-4. Plunger pump, 8-5. Emergency overflow valve, 8-6. Pressure gauge, 8-7. Emergency one-way throttle valve, 9. Cylinder follower rod device, 9-1. Follower rod guide base, 9-2. Follower rod, 10. Proximity switch, 11. Absolute waterproof stroke sensor; 12. Piston rod U-shaped sealing ring. DETAILED DESCRIPTION

[0023] This embodiment is a hydraulic gate opening and closing machine capable of emergency operation under long-term flooding conditions, comprising a hydraulic cylinder and a hydraulic control system.

[0024] In this example, the hydraulic cylinder uses a ceramic piston rod, and because the conventional built-in stroke detection device and the matching stroke switch cannot meet the long-term immersion working environment, the stroke detection device in this embodiment is an absolute waterproof stroke sensor based on the ceramic piston rod (without a matching stroke switch), and a set of piston rod follower rod device and a matching proximity switch are added. The conventional oil cylinder sealing type cannot meet the long-term immersion working environment, and this embodiment adds a U-shaped piston rod U-shaped sealing ring with a U-shaped cross section between the cylinder body and the piston rod. The U-shaped notch of the sealing ring faces the piston rod end to prevent external water from soaking and penetrating into the oil cylinder for a long time.

[0025] The absolute waterproof stroke sensor is installed on the cylinder body, and can directly read the piston rod stroke data in conjunction with the ceramic piston rod in the cylinder body. The guide base of the piston rod follower device is installed on the cylinder body. The follower rod is parallel to the axial direction of the piston rod and can be installed on the guide base along the axial direction. One end of the follower rod is fixed to the piston rod head. In this example, the proximity switch is installed on the guide base. When the hydraulic cylinder moves to the fully open position or the fully closed position, the proximity switch will send a corresponding position signal.

[0026] In this embodiment, the hydraulic control system has an oil tank, a main reversing valve and an emergency operator, etc. The oil tank is connected to the main reversing valve via an oil supply pipeline. The main reversing valve is connected to the rod chamber and rodless chamber of the hydraulic cylinder through a rod chamber pipeline and a rodless chamber pipeline respectively. The main reversing valve is connected to the oil tank via an oil return pipeline.

[0027] In this example, a balancing valve is provided on the rod cavity pipeline, and the control pipeline of the balancing valve is connected to the rodless cavity pipeline through a one-way throttle valve, and the balancing valve on the rod cavity pipeline can conduct reversely under the action of the pressure oil in the rodless cavity pipeline. A balancing valve is provided on the rodless cavity pipeline, and the control pipeline of the balancing valve is connected to the rod cavity pipeline through a one-way throttle valve, and the balancing valve on the rodless cavity pipeline can conduct reversely under the action of the pressure oil in the rod cavity pipeline.

[0028] In this embodiment, a proportional variable pump is installed on the oil supply pipeline. The proportional variable pump is controlled according to the feedback signal of the absolute waterproof stroke sensor. The hydraulic control system adopts the proportional variable pump and the motor assembly to generate pressure. During the opening and closing process of the miter gate, the output displacement of the proportional variable pump of the hydraulic hoist on the left and right banks is automatically adjusted to achieve more precise synchronous correction.

[0029] In this embodiment, the rod chamber of the hydraulic cylinder is connected with an oil replenishment branch (with a one-way valve) and an overflow branch (with an overflow valve), and both the oil replenishment branch and the overflow branch are connected to the oil tank via a connecting pipeline. A hydraulically controlled one-way valve is provided on the rod chamber pipeline, and the control pipeline of the hydraulically controlled one-way valve is connected to the overflow branch on the rod chamber of the hydraulic cylinder, which can be reversely conducted under the action of the pressure oil in the overflow branch, and can ensure the safety of the cylinder body when the pressure in the rod chamber is too high.

[0030] In this embodiment, the rodless chamber of the hydraulic cylinder is connected with an oil replenishment branch (with a one-way valve) and an overflow branch (with an overflow valve), and the oil replenishment branch and the overflow branch are connected to the oil tank via a connecting pipeline. A hydraulically controlled one-way valve is provided on the rodless chamber pipeline, and the control pipeline of the hydraulically controlled one-way valve is connected to the overflow branch on the rodless chamber of the hydraulic cylinder, which can be reversely conducted under the action of the pressure oil in the overflow branch, and can ensure the safety of the cylinder body when the pressure in the rodless chamber is too high.

[0031] In this embodiment, the emergency operator is directly connected to the pump station system through a ball valve. The emergency operator has a manual reversing valve. The oil tank is connected to the manual reversing valve via an emergency oil supply pipeline equipped with a plunger pump. The plunger pump is driven by a diesel engine. The manual reversing valve is connected to the rod chamber and rodless chamber of the hydraulic cylinder via the emergency rod chamber pipeline and the emergency rodless chamber pipeline respectively. The manual reversing valve is also connected to the oil tank via an emergency oil return pipeline, and an emergency one-way throttle valve is installed on the emergency oil return pipeline.

[0032] In this example, a speed regulating valve and a pressure gauge are provided on both the emergency rod chamber pipeline and the emergency rodless chamber pipeline; an overflow bypass is provided at the corresponding plunger pump outlet, the overflow bypass is connected to the oil tank via the emergency oil return pipeline, and an emergency overflow valve is provided on the overflow bypass.

[0033] In the case that the hydraulic hoist equipment loses the conventional power supply and the diesel engine emergency power supply, the embodiment can perform emergency operation through the emergency operator to realize the emergency passage of ships through the navigable river lock. When an emergency occurs, the diesel engine starts and drives the variable plunger pump to start working. The oil tank is connected to the rod cavity pipeline and the rodless cavity pipeline through the emergency oil supply pipeline, manual reversing valve, and speed regulating valve, and finally returns to the oil tank through the emergency one-way throttle valve. A relief valve bypass is provided at the outlet of the plunger pump to prevent the system pressure from being too high.

[0034] The working principle of this embodiment is as follows:

[0035] When the gate is opened, the hydraulic pump motor units on the left and right banks of the miter gate are started at no-load with a staggered start of 5 seconds. After a delay of about 10 seconds, the main reversing valve is energized, and the pressure oil enters the rod chambers of the left and right hydraulic cylinders after synchronization of the output displacement of the proportional variable pump. Under the action of the pressure oil in the rod chamber pipeline, the balance valve on the rodless chamber pipeline is reversed, and the oil in the rodless chamber of the hydraulic cylinder flows back to the oil tank through the rodless chamber pipeline, the main reversing valve and the return oil pipeline.

[0036] When the hydraulic cylinder stroke reaches the fully open position, the hydraulic control system shuts down.

[0037] When closing the gate, the hydraulic pump motor groups on the left and right banks of the miter gate are started at no-load with a staggered start of 5 seconds. After a delay of about 10 seconds, the main reversing valve is energized, and the pressure oil enters the rodless chambers of the left and right hydraulic cylinders after synchronization of the output displacement of the proportional variable pump. Under the action of the pressure oil in the rodless chamber pipeline, the balance valve on the rod chamber pipeline is reversed, and the oil in the rod chamber of the hydraulic cylinder flows back to the oil tank through the rod chamber pipeline, the main reversing valve and the return oil pipeline.

[0038] When the hydraulic cylinder stroke reaches the fully closed position, the hydraulic control system shuts down.

[0039] In this embodiment, when the hydraulic control system is shut down, the balance valve is locked in one direction, the oil in the hydraulic cylinder cannot be discharged freely, and the hydraulic cylinder is self-locked in both directions; when the ambient temperature rises, the volume of the hydraulic oil expands, the internal pressure increases, and the overflow valve on the overflow branch line overflows, limiting the working pressure of the cylinder body to avoid cylinder overload; when the ambient temperature changes, factors such as leakage in the hydraulic cylinder cause the volume of the hydraulic oil in the cylinder body to decrease, and the hydraulic cylinder is replenished from the oil tank through the one-way valve on the oil replenishment branch line to avoid air suction. The overflow valve and the one-way valve form a hydraulic lock unit, which realizes the functions of self-locking, high-pressure overflow and air suction and oil replenishment.

[0040] Under long-term flooding conditions, there is a risk that the hydraulic hoist equipment of the miter gate will lose the conventional power supply and the diesel engine emergency power supply. In order to realize the emergency passage of ships in the navigable river lock, the emergency operator can be operated to open and close the gate urgently. The specific operation method is as follows:

[0041] When using the emergency operator to open the gate, start the diesel generator and plunger pump first. After the pump group works stably, operate the manual reversing valve on the left and right banks at the same time. The pressure oil enters the rod chamber of the hydraulic cylinder after the speed regulating valve adjusts the speed. The oil in the rodless chamber of the hydraulic cylinder flows back to the oil tank through the emergency rodless chamber pipeline, manual reversing valve and emergency return pipeline. When the pressure is too high, the pressure oil overflows through the emergency relief valve;

[0042] When the hydraulic cylinder stroke reaches the fully open position, manually close the emergency operator reversing valve and the plunger pump diesel motor unit;

[0043] When using the emergency operator to close the gate, start the diesel generator and plunger pump first. After the pump group works stably, operate the manual reversing valve on the left and right banks at the same time. The pressure oil enters the rodless chamber of the hydraulic cylinder after the speed regulating valve is adjusted. The oil in the rod chamber of the hydraulic cylinder flows back to the oil tank through the emergency rod chamber pipeline, manual reversing valve and emergency return pipeline. When the pressure is too high, the pressure oil overflows through the emergency overflow valve.

[0044] When the hydraulic cylinder stroke reaches the fully closed position, manually close the emergency operator reversing valve and the plunger pump diesel motor unit.

Claims

1. A hydraulic gate hoist capable of emergency operation under long-term flooding conditions, comprising a hydraulic cylinder and a hydraulic control system, characterized in that: The hydraulic control system comprises an oil tank, a main reversing valve and an emergency operator, wherein the oil tank is connected to the main reversing valve via an oil supply pipeline equipped with a proportional variable pump, the main reversing valve is connected to the rod chamber and the rodless chamber of the hydraulic cylinder via a rod chamber pipeline and a rodless chamber pipeline respectively, and the main reversing valve is also connected to the oil tank via an oil return pipeline; A balancing valve is provided on the rod cavity pipeline, and the control pipeline of the balancing valve is connected to the rodless cavity pipeline. The balancing valve on the rod cavity pipeline can conduct reversely under the action of the pressure oil in the rodless cavity pipeline; A balancing valve is provided on the rodless cavity pipeline, and the control pipeline of the balancing valve is connected to the rod cavity pipeline. The balancing valve on the rodless cavity pipeline can conduct reversely under the action of the pressure oil in the rod cavity pipeline; The emergency operator has a manual reversing valve, the oil tank is connected to the manual reversing valve via an emergency oil supply pipeline equipped with a plunger pump, the plunger pump is driven by a diesel engine, the manual reversing valve is connected to the rod chamber and the rodless chamber of the hydraulic cylinder via an emergency rod chamber pipeline and an emergency rodless chamber pipeline, respectively, and the manual reversing valve is also connected to the oil tank via an emergency oil return pipeline; An oil replenishment branch and an overflow branch are provided between the oil tank and the rod chamber and the rodless chamber of the hydraulic cylinder, wherein the oil replenishment branch is provided with a one-way valve, and the overflow branch is provided with an overflow valve; A hydraulically controlled one-way valve is provided on the pipeline with the rod cavity, and the control pipeline of the hydraulically controlled one-way valve is connected to the overflow branch on the rod cavity of the hydraulic cylinder; a hydraulically controlled one-way valve is provided on the pipeline with the rodless cavity, and the control pipeline of the hydraulically controlled one-way valve is connected to the overflow branch on the rodless cavity of the hydraulic cylinder; The piston rod of the hydraulic cylinder is a ceramic piston rod; The hydraulic cylinder is equipped with an absolute waterproof stroke sensor based on a ceramic piston rod, which can provide a feedback signal for the control of the proportional variable pump; The cylinder body of the hydraulic cylinder is provided with a U-shaped piston rod sealing ring with a U-shaped cross section; The hydraulic cylinder is provided with a piston rod follower device, and the piston rod follower device is provided with a proximity switch corresponding to the fully open position and the fully closed position of the hydraulic cylinder.

2. The hydraulic hoist for a miter gate capable of emergency operation under long-term flooding conditions according to claim 1 is characterized in that: An overflow bypass is provided corresponding to the outlet of the plunger pump, and an emergency overflow valve is provided on the overflow bypass.

3. The hydraulic hoist for a miter gate capable of emergency operation under long-term flooding conditions according to claim 1 or 2, characterized in that: The emergency rod-cavity pipeline and the emergency rodless cavity pipeline are provided with speed regulating valves.

Images