Trestle telescopic interaction compensation control system

Abstract

According to the trestle stretching interaction compensation control system, when a trestle needs to stretch out in compensation, a servo proportional reversing valve communicates with a second oil way, hydraulic oil passes through a first one-way valve in a combination valve and then is directly connected with an A1 valve port of a single-piston-rod cylinder, a piston of the single-piston-rod cylinder is pushed to stretch out, and then the trestle is driven to stretch out; in addition, active pressure relief can be achieved through a first overflow valve in the second oil way, and passive pressure relief can be achieved through a first control valve in the combination valve. When the trestle needs to retract in the compensation process, the servo proportional reversing valve communicates with a third oil way, hydraulic oil passes through a fourth one-way valve in the combination valve and then is directly connected with an A2 valve port of the single-piston-rod cylinder, a piston of the single-piston-rod cylinder is pushed to retract, in addition, active pressure relief can be achieved through a second overflow valve in the third oil way, and therefore the trestle can be effectively compensated. Passive pressure relief is achieved through a second control valve in the combination valve.

Description

Technical Field

[0001] The present invention relates to the technical field of ship trestle bridges, and in particular to a trestle bridge telescopic interactive compensation control system. Background Art

[0002] The pier is mainly used to transport people or goods. At sea, the pier is used to transport people and materials between two ships. Since the ships are moving relative to each other, collisions may occur. Therefore, the relative positions of the two ships need to be considered so that the pier set between the two ships is in a passive compensation state. At the same time, in an emergency, emergency detachment can be achieved to ensure safety between the ships.

[0003] For example, the patent document with Chinese patent application number 201711236087.2 and publication date 2019.09.10 discloses a position-compensated retractable boarding trestle hydraulic system, including a power system, a slewing hydraulic system, a telescopic hydraulic system and a boom hydraulic system. The power system includes a hydraulic oil tank, a main pump group and a high and low pressure pump group; the slewing hydraulic system includes a slewing selection valve, a direction speed control valve, a brake control valve, a mode selection valve, a balancing valve one, a balancing valve two, a two-way directional valve, a sequence valve, a hydraulic motor and a brake; the telescopic hydraulic system includes a telescopic selection valve, a direction speed control valve, a brake control valve, a mode selection valve, a balancing valve one, a balancing valve two, a two-way directional valve, a sequence valve, a hydraulic motor and a telescopic brake; the boom hydraulic system includes a boom selection valve, a boom direction speed control valve, a boom accumulator control valve, a boom accumulator switch valve, a boom accumulator oil filling control valve, a plunger accumulator and a boom cylinder.

[0004] In the above-mentioned literature, the swing of the telescopic trestle is controlled by a rotary hydraulic system, a telescopic hydraulic system and a variable amplitude hydraulic system to achieve manual splicing, active compensation and follow-up compensation, so that the splicing of the step bridge is reliable and safe. This process requires the coordination of multiple systems. In actual operation, it is relatively cumbersome and prone to operational errors. The maintenance process is time-consuming and the application cost is high. Summary of the Invention

[0005] The purpose of the present invention is to provide a trestle telescopic interactive compensation control system, which can realize interactive compensation in the telescopic direction of the trestle after the lap is completed. The controlled hydraulic system is simple and has high reliability and low cost.

[0006] In order to achieve the above-mentioned purpose, a trestle telescopic interactive compensation control system is provided, which includes a first oil circuit, a servo proportional reversing valve, a second oil circuit, a third oil circuit, a fourth oil circuit, a fifth oil circuit, a combination valve, a single-piston rod cylinder, an oil pump, an oil tank and two or more relief valves, wherein one end of the first oil circuit is connected to the oil tank, the other end of the first oil circuit is connected to the P1 valve port of the servo proportional reversing valve, the P3 valve port of the servo proportional reversing valve is connected to one end of the combination valve through the second oil circuit, the P4 valve port of the servo proportional reversing valve is connected to one end of the combination valve through the third oil circuit, and the other end of the combination valve is connected to the P1 valve port of the servo proportional reversing valve. One end is connected to the single-piston rod cylinder, and an overflow valve is connected between the second oil circuit and the fourth oil circuit and between the third oil circuit and the fourth oil circuit; the combination valve includes control valve 1, control valve 2 and two or more one-way valves, and the two ends of the single-piston rod cylinder are respectively connected to the second oil circuit and the third oil circuit through the one-way valves, one end of control valve 1 is connected to the single-piston rod cylinder, and the other end of control valve 1 is connected to the third oil circuit, one end of control valve 2 is connected to the single-piston rod cylinder, and the other end of control valve 2 is connected to the second oil circuit, and the oil tank is respectively connected to control valve 1 and control valve 2 through the fifth oil circuit.

[0007] The above arrangement, by providing a servo-proportional reversing valve, can independently control the second oil circuit or the third oil circuit connected to the servo-proportional reversing valve, thereby controlling the hydraulic oil to drive the single-piston rod cylinder to achieve the extension or retraction of the trestle, thereby achieving interactive compensation of the trestle in the extension and retraction direction after the lap is completed, eliminating the relative movement between the ships, and keeping the two ships relatively stationary on the sea surface; and by providing a relief valve, during the interactive compensation of the trestle by the servo-proportional reversing valve, if the oil pressure in the oil circuit is higher than the pressure value set by the relief valve, the relief valve can be opened, and the hydraulic oil can flow through the relief valve through the fourth oil circuit and return to the oil tank, thereby actively reducing the oil pressure of the oil circuit and acting as a back pressure; due to the provision of the combination valve, when the trestle is passively subjected to external force and the oil pressure of the oil circuit connected to the combination valve is higher than the pressure value set by the control valve, the control valve can be opened, allowing the hydraulic oil to flow through the control valve through the fifth oil circuit and return to the oil tank, thereby passively reducing the oil pressure of the oil circuit and providing back pressure, better protecting the oil circuit, and making the oil circuit reliable and simple in structure.

[0008] Furthermore, a pressure compensating valve is provided in the first oil circuit, the oil tank is connected to one end of the pressure compensating valve via an oil pump, and the other end of the pressure compensating valve is connected to the P1 valve port of the servo proportional reversing valve.

[0009] The above arrangement can supply the hydraulic oil in the oil tank into the first oil circuit through the oil pump, and increase the pressure of the hydraulic oil through the pressure compensation valve to flow to the servo proportional reversing valve.

[0010] Furthermore, the shuttle valve is connected to the pressure compensation valve, and both ends of the shuttle valve are connected to the second oil circuit and the third oil circuit respectively.

[0011] The above arrangement can prevent the second oil circuit and the third oil circuit from being connected at the same time.

[0012] Furthermore, the overflow valve includes overflow valve 1 and overflow valve 2, one end of overflow valve 1 is connected to the second oil circuit, one end of overflow valve 2 is connected to the third oil circuit, the other end of overflow valve 1 and the other end of overflow valve 2 are connected to the fourth oil circuit, one end of the fourth oil circuit is connected to the P2 valve port of the servo proportional reversing valve, and the other end of the fourth oil circuit is connected to the oil tank.

[0013] With the above arrangement, during the process of active compensation of the trestle through the servo proportional reversing valve, when the oil pressure in the second oil circuit is greater than the pressure value set by the relief valve 1, the relief valve 1 is turned on, so that the hydraulic oil in the second oil circuit can flow into the fourth oil circuit through the relief valve 1, and then flow back to the oil tank, actively reducing the oil pressure in the second oil circuit; when the oil pressure in the third oil circuit is greater than the pressure value set by the relief valve 2, the relief valve 2 is turned on, so that the hydraulic oil in the third oil circuit can flow into the fourth oil circuit through the relief valve 2, and then flow back to the oil tank, actively reducing the oil pressure in the third oil circuit, thereby protecting the single-piston rod cylinder and preventing damage caused by excessive oil pressure on the single-piston rod cylinder.

[0014] Furthermore, the one-way valve includes one-way valve one, one-way valve two, one-way valve three and one-way valve four, and the single-piston rod cylinder is provided with an A1 valve port and an A2 valve port. One end of the second oil circuit is connected to the P3 valve port of the servo proportional reversing valve, and one end of the one-way valve one is respectively connected to the other end of the second oil circuit and the other end of the control valve two. The A1 valve port of the single-piston rod cylinder is respectively connected to one end of the one-way valve two, one end of the control valve one and the other end of the one-way valve one.

[0015] With the above arrangement, when the piston of the single-piston rod cylinder is controlled to extend and is passively acted upon by an external force, causing the hydraulic oil pressure to be higher than the pressure value set by the control valve 1, part of the hydraulic oil can flow through the control valve 1, through the fifth oil circuit, and then back to the oil tank, thereby relieving part of the pressure.

[0016] Furthermore, one end of the third oil circuit is connected to the P4 valve port of the servo proportional reversing valve, one end of the one-way valve four is respectively connected to the other end of the third oil circuit and the other end of the control valve one, and the A2 valve port of the single-piston rod cylinder is respectively connected to one end of the one-way valve three, one end of the control valve two and the other end of the one-way valve four.

[0017] With the above arrangement, when the piston of the single-piston rod cylinder is controlled to retract and is passively acted upon by an external force, causing the hydraulic oil pressure to be higher than the pressure value set by the second control valve, part of the hydraulic oil can flow through the second control valve, through the fifth oil circuit, and then back to the oil tank, thereby relieving part of the pressure.

[0018] Furthermore, one end of the fifth oil circuit is respectively connected to the other end of the one-way valve 2, the other end of the one-way valve 3, the control valve 1 and the control valve 2, and the other end of the fifth oil circuit is connected to the oil tank.

[0019] The above arrangement, in which one-way valve two and one-way valve three are respectively connected to the two ends of the single-piston rod cylinder, can prevent the hydraulic oil of the single-piston rod cylinder from being directly connected to the fifth oil circuit and flowing back to the oil tank, causing the oil pressure of the single-piston rod cylinder to drop to zero instantly. Instead, local pressure relief is achieved by the hydraulic oil flowing through control valve one and control valve two and flowing back to the oil tank through the fifth oil circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structural connection of the present invention.

[0021] Figure 2 for Figure 1 Enlarged view of point D in the middle. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1 to 2 As shown, a trestle telescopic interactive compensation control system includes a first oil circuit 1, a shuttle valve 6, a servo proportional reversing valve 7, a second oil circuit 2, a third oil circuit 3, a fourth oil circuit 4, a fifth oil circuit 5, a combination valve, a single-piston rod cylinder 8, an oil pump 9, an oil tank 10 and more than two overflow valves.

[0024] One end of the first oil circuit 1 is connected to the oil tank 10 through the oil pump 9, and the other end of the first oil circuit 1 is connected to the P1 valve port of the servo proportional reversing valve 7 through the pressure compensating valve 11. In this embodiment, a pressure compensating valve 11 is provided in the first oil circuit 1, and the oil tank 10 is connected to one end of the pressure compensating valve 11 through the oil pump 9, and the other end of the pressure compensating valve 11 is connected to the P1 valve port of the servo proportional reversing valve 7. The hydraulic oil in the oil tank 10 can be supplied to the first oil circuit 1 through the oil pump 9, and the pressure of the hydraulic oil is increased by the pressure compensating valve 11 to flow to the servo proportional reversing valve 7. The shuttle valve 6 is connected to the pressure compensating valve 11, and the two ends of the shuttle valve 11 are respectively connected to the second oil circuit 2 and the third oil circuit 3. The shuttle valve 6 is used to prevent the second oil circuit 2 and the third oil circuit 3 from being connected at the same time.

[0025] The P3 valve port of the servo proportional reversing valve 7 is connected to one end of the combination valve through the second oil circuit 2, and the P4 valve port of the servo proportional reversing valve 7 is connected to one end of the combination valve through the third oil circuit 3. The other end of the combination valve is connected to the single-piston rod cylinder 8. In this embodiment, the combination valve includes a control valve a1, a control valve a2, and two or more one-way valves. The one-way valves include a one-way valve s1, a one-way valve s2, a one-way valve s3, and a one-way valve s4. Both ends of the single-piston rod cylinder 8 are connected to the second oil circuit 2 and the third oil circuit 3 respectively through the one-way valves. The single-piston rod cylinder 8 is provided with an A1 valve port and an A2 valve port. Figure 2 As shown, one end of the second oil circuit 2 is connected to the P3 valve port of the servo proportional reversing valve 7, one end of the one-way valve s1 is respectively connected to the other end of the second oil circuit 2 and the control end of the control valve a2, and the A1 valve port of the single-piston rod cylinder 8 is respectively connected to one end of the one-way valve s2, one end of the control valve a1, and the other end of the one-way valve s1. In this way, when the servo proportional reversing valve 7 is connected to the second oil circuit 2 alone to control the piston of the single-piston rod cylinder 8 to extend, it is passively subjected to external forces, causing the oil pressure of the hydraulic oil to be higher than the pressure value set by the control valve a1. In this embodiment, the pressure value set by the control valve a1 is 70 bar, which can make part of the hydraulic oil flow through the control valve a1 through the fifth oil circuit 5 and then flow back to the oil tank 10, thereby releasing part of the pressure; one end of the third oil circuit 3 is connected to the P4 valve port of the servo proportional reversing valve 7, one end of the check valve 4 s4 is respectively connected to the other end of the third oil circuit 3 and the control end of the control valve a1, and the A2 valve port of the single-piston rod cylinder 8 is respectively connected to one end of the check valve 3 s3, one end of the control valve 2 a2 and the other end of the check valve 4 s4. Similarly, when the servo proportional reversing valve 7 is connected to the third oil circuit 3 alone to control the piston of the single-piston rod cylinder 8 to retract and is passively subjected to external force so that the oil pressure of the hydraulic oil is higher than the pressure value set by the control valve a2, in this embodiment, the pressure value set by the control valve a2 is 70 bar, which can make part of the hydraulic oil flow through the control valve a2 through the fifth oil circuit 5 and then flow back to the oil tank 10, thereby relieving part of the pressure; the oil tank 10 is connected to the control valve a1 and the control valve a2 respectively through the fifth oil circuit 5. Specifically, one end of the fifth oil circuit 5 is divided into The fifth oil passage 5 is connected to the other end of the check valve 2 s2, the other end of the check valve 3 s3, the control valve 1 a1, and the control valve 2 a2, respectively. The other end of the fifth oil passage 5 is connected to the oil tank. By providing the check valve 2 s2 and the check valve 3 s3, respectively, connecting the two ends of the single-piston-rod cylinder 8, the hydraulic oil in the single-piston-rod cylinder 8 is prevented from directly connecting to the fifth oil passage 5 and flowing back into the oil tank 10, thereby causing the oil pressure in the single-piston-rod cylinder 8 to drop to zero instantaneously. Instead, the hydraulic oil flowing through the control valve 1 a1 and the control valve 2 a2 flows back into the oil tank 10 through the fifth oil passage 5, achieving localized pressure relief. In this example, both the control valve 1 and the control valve 2 are relief valves.

[0026] like Figure 1As shown, overflow valves are connected between the second oil circuit 2 and the fourth oil circuit 4 and between the third oil circuit 3 and the fourth oil circuit 4. The overflow valves include overflow valve 1 z1 and overflow valve 2 z2. One end of overflow valve 1 z1 is connected to the second oil circuit 2, one end of overflow valve 2 z2 is connected to the third oil circuit 3, the other end of overflow valve 1 z1 and the other end of overflow valve 2 z2 are connected to the fourth oil circuit 4, one end of the fourth oil circuit 4 is connected to the P2 valve port of the servo proportional reversing valve 7, and the other end of the fourth oil circuit 4 is connected to the oil tank. In this way, during the interactive compensation process of the trestle through the servo proportional reversing valve 7, when the oil pressure in the second oil circuit 2 is greater than the pressure value set by the overflow valve 1 z1, in this embodiment, the overflow valve 1 The pressure value set by z1 is 30 bar. When the overflow valve z1 is turned on, the hydraulic oil in the second oil circuit 2 can flow into the fourth oil circuit 4 through the overflow valve z1, and then flow back to the oil tank 10, actively reducing the oil pressure in the second oil circuit 2; when the oil pressure in the third oil circuit 3 is greater than the pressure value set by the overflow valve z2, in this embodiment, the pressure value set by the overflow valve z2 is 45 bar. When the overflow valve z2 is turned on, the hydraulic oil in the third oil circuit 3 can flow into the fourth oil circuit 4 through the overflow valve z2, and then flow back to the oil tank 10, actively reducing the oil pressure in the third oil circuit 3, thereby protecting the single-piston rod cylinder 8 and preventing the single-piston rod cylinder 8 from being damaged due to excessive oil pressure.

[0027] In this embodiment, when the servo proportional reversing valve 7 is disconnected from both the second oil circuit 2 and the third oil circuit 3 , the trestle is in a stationary state.

[0028] The working principle of the present invention is: when the trestle needs to be extended, the single piston rod will pull the single piston rod because the trestle is connected to the ship, so that Figure 1 In the viewing direction, when the pressure of the hydraulic oil on the right side of the single-piston-rod cylinder is greater than the set pressure of the control valve a2, the hydraulic oil on the right side of the single-piston-rod cylinder will flow back to the oil tank through the control valve a2 and the fifth oil circuit 5. At the same time, the oil pump 9 is started, the servo proportional reversing valve 7 is reversed, and the oil pump 9 pumps the hydraulic oil into the first oil circuit 1. The hydraulic oil entering the first oil circuit 1 flows through the pressure compensation valve 11, the servo proportional reversing valve 7 and the second oil circuit 2. After passing through the one-way valve s2 in the combination valve, the hydraulic oil is directly connected to the A1 valve port of the single-piston-rod cylinder 8, replenishing oil to the left side of the single-piston-rod cylinder and providing a certain oil pressure, prompting the single piston rod to move to the right.

[0029] When the trestle needs to be retracted, the single piston rod will push the single piston rod back because the trestle is connected to the ship. Figure 1In the viewing direction, when the pressure of the hydraulic oil on the left side of the single-piston-rod cylinder is greater than the set pressure of the control valve a1, the hydraulic oil on the left side of the single-piston-rod cylinder will flow back to the oil tank through the control valve a1 and the fifth oil circuit 5. At the same time, the oil pump 9 is started, the servo proportional reversing valve 7 is reversed, and the oil pump 9 pumps the hydraulic oil into the first oil circuit 1. The hydraulic oil entering the first oil circuit 1 flows through the pressure compensation valve 11, the servo proportional reversing valve 7 and the third oil circuit 3. After passing through the one-way valve 4 s4 in the combination valve, the hydraulic oil is directly connected to the A2 valve port of the single-piston-rod cylinder 8, replenishing oil to the right side of the single-piston-rod cylinder and providing a certain oil pressure, prompting the single piston rod to move to the left.

[0030] In this example, due to the provision of a pressure compensating valve 11, the drain port of the pressure compensating valve 11 is connected to the second oil circuit 2 and the third oil circuit 3 via the shuttle valve 6. Thus, when the second oil circuit 2 is supplying oil, and the oil pressure in the second oil circuit 2 is greater than the oil pressure at the drain port of the pressure compensating valve 11, an oil pressure is applied to the drain port of the pressure compensating valve 11, thereby replenishing the oil pressure in the second oil circuit. Similarly, if the third oil circuit 3 is supplying oil, based on the above principle, the oil pressure in the third oil circuit is also replenished. Due to the provision of relief valve 1 and relief valve 2, when the pressure in the second oil circuit exceeds the set pressure of relief valve 1, the hydraulic oil in the second oil circuit will flow out of relief valve 1, thereby better controlling the hydraulic oil in the second oil circuit. When the pressure in the third oil circuit exceeds the set pressure of relief valve 2, the hydraulic oil in the third oil circuit will flow out of relief valve 2, thereby better controlling the hydraulic oil in the third oil circuit. The combination valve is set up to facilitate oil drainage on the one hand, and to provide back pressure on the other hand so that the trestle will not extend or retract so quickly.

Claims

1. A trestle telescopic interactive compensation control system, comprising a first oil circuit, a servo proportional reversing valve, a second oil circuit, a third oil circuit, a fourth oil circuit, a fifth oil circuit, a combination valve, a single piston rod cylinder, an oil pump, an oil tank and more than two overflow valves, Features: One end of the first oil circuit is connected to the oil tank, the other end of the first oil circuit is connected to the P1 valve port of the servo proportional reversing valve, the P3 valve port of the servo proportional reversing valve is connected to one end of the combination valve through the second oil circuit, the P4 valve port of the servo proportional reversing valve is connected to one end of the combination valve through the third oil circuit, the other end of the combination valve is connected to the single-piston rod cylinder, and overflow valves are connected between the second oil circuit and the fourth oil circuit and between the third oil circuit and the fourth oil circuit; The combination valve includes control valve 1, control valve 2 and more than two one-way valves. The two ends of the single-piston rod cylinder are respectively connected to the second oil circuit and the third oil circuit through the one-way valves. One end of control valve 1 is connected to the single-piston rod cylinder, and the other end of control valve 1 is connected to the third oil circuit. One end of control valve 2 is connected to the single-piston rod cylinder, and the other end of control valve 2 is connected to the second oil circuit. The oil tank is respectively connected to control valve 1 and control valve 2 through the fifth oil circuit.

2. A trestle telescopic interactive compensation control system according to claim 1, Features: A pressure compensating valve is provided in the first oil circuit, the oil tank is connected to one end of the pressure compensating valve through an oil pump, and the other end of the pressure compensating valve is connected to the P1 valve port of the servo proportional reversing valve.

3. A trestle telescopic interactive compensation control system according to claim 1, Features: The shuttle valve is connected to the pressure compensation valve, and both ends of the shuttle valve are connected to the second oil circuit and the third oil circuit respectively.

4. The trestle telescopic interactive compensation control system according to claim 1, Features: The overflow valve includes overflow valve 1 and overflow valve 2, one end of overflow valve 1 is connected to the second oil circuit, one end of overflow valve 2 is connected to the third oil circuit, the other end of overflow valve 1 and the other end of overflow valve 2 are connected to the fourth oil circuit, one end of the fourth oil circuit is connected to the P2 valve port of the servo proportional reversing valve, and the other end of the fourth oil circuit is connected to the oil tank.

5. The trestle telescopic interactive compensation control system according to claim 1, Features: The one-way valve includes one-way valve 1, one-way valve 2, one-way valve 3 and one-way valve 4. The single-piston rod cylinder is provided with an A1 valve port and an A2 valve port. One end of the second oil circuit is connected to the P3 valve port of the servo proportional reversing valve, one end of the one-way valve 1 is respectively connected to the other end of the second oil circuit and the other end of the control valve 2, and the A1 valve port of the single-piston rod cylinder is respectively connected to one end of the one-way valve 2, one end of the control valve 1 and the other end of the one-way valve 1.

6. The trestle telescopic interactive compensation control system according to claim 1, Features: One end of the third oil circuit is connected to the P4 valve port of the servo proportional reversing valve, one end of the one-way valve four is respectively connected to the other end of the third oil circuit and the other end of the control valve one, and the A2 valve port of the single-piston rod cylinder is respectively connected to one end of the one-way valve three, one end of the control valve two and the other end of the one-way valve four.

7. The trestle telescopic interactive compensation control system according to claim 1, Features: One end of the fifth oil circuit is respectively connected to the other end of the one-way valve 2, the other end of the one-way valve 3, the control valve 1 and the control valve 2, and the other end of the fifth oil circuit is connected to the oil tank.

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