Self-adaptive temperature control hydraulic circuit for deep-sea scientific investigation winch

Abstract

The utility model relates to a self-adaptive temperature control hydraulic loop for a deep-sea scientific investigation winch, a motor drives a main oil pump and an oil supplementing pump, the main oil pump and a hydraulic motor form a hydraulic closed loop, and the main oil pump drives the hydraulic motor to operate in different directions by changing the output direction of high-pressure oil; a three-way hydraulic control reversing valve and a pressure sensor are arranged in the loop, and the three-way hydraulic control reversing valve is connected with an oil temperature sensor. The three-way hydraulic control reversing valve is connected with an oil return tank through a proportional flow valve via an overflow valve; a variable oil cylinder is further connected in the loop, a piston of the variable oil cylinder is connected with the hydraulic motor, a spring is arranged at the piston end of the variable oil cylinder, and a pressure cavity of the variable oil cylinder is connected with a cavity A and a cavity B of the hydraulic motor through proportional pressure reducing valves and one-way valves respectively. According to the utility model, real-time self-adaptive control of hot oil flow, recharging oil flow and winch rotating speed can be realized, the purpose of controlling temperature rise of a main loop is achieved, the working efficiency of laying and recovery of the winch in deep sea scientific investigation is improved, and the automation degree is improved.

Description

Technical Field

[0001] The utility model relates to a deep-sea winch, in particular to an adaptive temperature control hydraulic circuit for a deep-sea scientific research winch. Background Art

[0002] The 10,000-meter deep-sea scientific research winch, used in scientific research and investigation, can also be used as a deployment and recovery winch for deep-sea mining vehicles, deep-sea salvage, deep-water drilling rigs, and other deep-water operational facilities. Unlike ordinary hoisting winches that operate over short distances and in short or intermittent conditions, the 10,000-meter deep-sea scientific research winch has a cable length of 3 to 10 kilometers. The entire operation can take hours or even days. Furthermore, due to the inherent weight of the cable, the winch load constantly changes as the cable is released and retracted.

[0003] Based on the above characteristics of deep-sea winch, the following problems will arise during use:

[0004] 1. After working for a long time, the closed hydraulic circuit used by the winch continues to heat up;

[0005] 2. Under the lowering condition, the potential energy of the load is converted into heat energy. During the entire lowering process, the load gradually increases. The machine should run at high speed when the load is small in the early stage, and at low speed when the load is large in the later stage. The current technology uses high / low gear switching, which cannot adjust the speed in real time to improve the working efficiency.

[0006] 3. The closed system used by conventional winches generally adopts the method of replenishing oil and replacing oil, replacing part of the hot oil in the circuit, and replenishing cold oil from the oil tank through the replenishing oil pump, so as to achieve heat exchange in the circuit and achieve thermal balance. However, this method has direct requirements on the specifications of the configured replenishing oil pump. The greater the heat exchange capacity, the larger the displacement of the replenishing oil pump, and the greater the power loss. Therefore, for ordinary winches, due to their high-speed and high-power working conditions, they are all intermittent. From the perspective of economy, the flow rate of the replenishing oil circuit is relatively small. The complex and changeable working conditions of deep-sea scientific research winches lead to very different circuit heating values ​​at different stages. If the heat exchange effect is guaranteed by blindly increasing the displacement of the replenishing oil pump (increasing the replenishing oil flow), it will inevitably cause a great waste of resources.

[0007] 4. The temperature rise of the hydraulic closed circuit is most closely related to the winch speed. Even under low load conditions, the temperature rise will be too high if the winch continues to run at high speed. At this time, the temperature rise can only be controlled by manually reducing the speed, which places high demands on the operator's duty and is not conducive to automated deployment.

[0008] 5. One of the important factors affecting the winch deployment efficiency is the speed reduction due to excessive temperature rise.

[0009] Currently, similar products generally adopt a fixed flow and non-adjustable oil replacement solution. The oil replenishment pump and the oil replacement flow are fixed. They can be used for short-term work or systems with stable working conditions and small changes. However, there is power waste and it cannot adapt to the long-term, complex and changeable working conditions of deep-sea long-distance winches.

[0010] Utility model patent CN201825568U discloses a flushing and cooling branch for a closed hydraulic system in a bucket wheel excavator. This utility model uses a fixed-flow hydraulically controlled reversing valve for oil change, and detects the oil temperature via a temperature sensor installed in the oil tank. When the oil temperature in the oil tank exceeds the limit, the heat generation is reduced by opening the unloading valve between the AB chamber valves. This technical solution is used in bucket wheel excavators. The oil temperature it controls is the oil temperature in the oil tank, not the oil temperature in the closed circuit. If the system oil change flow is insufficient, the oil temperature in the closed circuit cannot be reflected by the oil temperature in the oil tank. Furthermore, reducing the heat generation by unloading the AB chamber valve will also cause the winch operation to be interrupted, which cannot meet the operating conditions of deep-sea scientific research winches.

[0011] Current deep-sea long-distance scientific research winches solve this problem by installing a temperature sensor in the main circuit. When the temperature sensor exceeds the high temperature limit, an alarm signal is issued and the winch is manually controlled to slow down, thereby reducing the temperature. This is labor-intensive for the operator and is not conducive to automated retraction and deployment. Summary of the Invention

[0012] The utility model aims to provide an adaptive temperature control hydraulic circuit for deep-sea scientific research winches. On the basis of limited oil change and oil replenishment flow, it takes temperature, pressure, speed and other signals as input, combines the special working conditions of long-distance winches, and realizes real-time adaptive control of hot oil flow, oil replenishment flow and winch speed through corresponding algorithms and hydraulic control circuit design, so as to achieve the purpose of controlling the temperature rise of the main circuit, improve the efficiency of the deployment and recovery operation of deep-sea scientific research winches, and enhance the degree of automation.

[0013] To achieve the above-mentioned purpose, the technical solution of the utility model is: an adaptive temperature control hydraulic circuit for deep-sea scientific research winch, including a motor, a main oil pump, a charge pump, a relief valve, a proportional flow valve, a three-way hydraulically controlled reversing valve, an oil temperature sensor, a pressure sensor, a proportional pressure reducing valve, a variable oil cylinder, a spring, a hydraulic motor, a winch, and a controller. The motor drives the main oil pump and the charge pump to operate, and the main oil pump and the hydraulic motor form a hydraulic closed circuit. The main oil pump drives the hydraulic motor to run in different directions by changing the output direction of the high-pressure oil, thereby driving the winch to lift and Lowering operation; a three-way hydraulically controlled reversing valve and a pressure sensor are provided in the hydraulic closed circuit, and the two oil inlets of the three-way hydraulically controlled reversing valve are respectively connected to oil temperature sensors; the oil return port of the three-way hydraulically controlled reversing valve is connected back to the oil tank through a proportional flow valve and an overflow valve; a variable cylinder is also connected in the hydraulic closed circuit, the piston of the variable cylinder is connected to the hydraulic motor, a spring is provided at the piston end of the variable cylinder, the pressure chamber of the variable cylinder is connected to the A and B chambers of the hydraulic motor through a proportional pressure reducing valve and a one-way valve respectively, and the controller is respectively connected to the proportional flow valve, the oil temperature sensor, the pressure sensor, and the proportional pressure reducing valve.

[0014] Furthermore, when the B port of the main oil pump outputs high-pressure oil, oil enters the B port of the hydraulic motor and oil exits the A port, and the hydraulic motor drives the winch to reel in the cable.

[0015] Furthermore, when the A port of the main oil pump outputs high-pressure oil, the A port of the hydraulic motor takes in oil and the B port outputs oil, and the hydraulic motor drives the winch to release the cable.

[0016] Furthermore, the oil replenishing pump replenishes oil into the hydraulic closed circuit through the one-way valve.

[0017] The beneficial effects of the utility model are:

[0018] 1. According to the different heating power under various working conditions, the oil flow rate and the oil replenishment flow rate are automatically changed, so that the temperature of the closed circuit is maintained constant and the oil replenishment pump is adjusted to the appropriate flow rate to avoid excessive occupation of power resources;

[0019] 2. In view of the working conditions of the winch load constantly changing during the whole retraction and extension process, the motor displacement can be adaptively adjusted according to the load (pressure) and circuit temperature under the control of the controller, so that the entire retraction and extension process is always in an efficient retraction and extension state under the premise of ensuring that the circuit temperature is within the appropriate range;

[0020] 3. Closed-loop temperature control maintains the circuit temperature at a specific temperature to adapt to oils of different viscosities, thereby improving equipment performance and component life;

[0021] 4. When installing and using the deep-sea scientific research winch of the utility model, there is no need to artificially reduce the winch speed when the circuit temperature alarm occurs during operation, so as to avoid the failure to speed up in time after manual intervention to reduce the speed, which affects the operation efficiency and increases the workload of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The utility model is a self-adaptive temperature control hydraulic circuit diagram for a deep-sea scientific research winch. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 As shown, an embodiment of the utility model provides an adaptive temperature control hydraulic circuit for a deep-sea scientific research winch, including a motor 1, a main oil pump 2, a replenishing oil pump 3, a one-way valve A4, a one-way valve B5, a relief valve 6, a proportional flow valve 7, a three-way hydraulically controlled reversing valve 8, an oil temperature sensor A10, an oil temperature sensor B11, a pressure sensor 12, a proportional pressure reducing valve 13, a variable oil cylinder 14, a spring 15, a one-way valve C16, a one-way valve D17, a hydraulic motor 18, and a winch 19.

[0025] Motor 1 drives the main oil pump 2 and charge pump 3. The main oil pump 2 and hydraulic motor 18 form a closed hydraulic circuit. The main oil pump 2 can change the direction of its high-pressure oil output, driving the hydraulic motor 18 in different directions, thereby driving the winch 19 for lifting and lowering operations. When port B of the main oil pump 2 is outputting high-pressure oil, meaning oil is flowing into port B and out of port A of the hydraulic motor 18, the hydraulic motor 18 drives the winch 19 to reel in the cable. When port A of the main oil pump 2 is outputting high-pressure oil, meaning oil is flowing into port A and out of port B of the hydraulic motor 18, the hydraulic motor 18 drives the winch 19 to release the cable. The closed hydraulic circuit formed by the main oil pump 2 and hydraulic motor 18 is subject to leakage during operation. The charge pump 3 is used to replenish oil into the circuit through check valves A4 and B5.

[0026] The working and control principles of the adaptive temperature control hydraulic circuit for deep-sea scientific research winches of this utility model are as follows:

[0027] Take the winch lifting as an example (the same applies to lowering): Assume that the B port of the main oil pump 2 outputs high-pressure oil (winch lifting), that is, the B port is high pressure and the A port is low pressure. The high-pressure oil at the B port enters the hydraulic motor 18 and becomes low-pressure oil after working, and comes out from the A port and is sucked back into the A port of the oil pump. The cycle works in this way, and the oil temperature at the A port gradually increases. At this time, the pressures of the A and B ports act on the control chambers on both sides of the three-way hydraulically controlled reversing valve 8 respectively. Since the pressure of the B port is greater than the pressure of the A port, the three-way hydraulically controlled reversing valve 8 switches to the right position. The low-pressure oil on the A side of the circuit passes through the three-way hydraulically controlled reversing valve 8 and then passes through the proportional flow valve 7 and the overflow valve 6 and then returns to the oil tank for cooling. At the same time, the oil replenishment pump 3 replenishes the corresponding flow of cold oil into the A side of the circuit through the one-way valve 4, thereby realizing hot and cold exchange and oil replenishment.

[0028] During this process, the hot oil flow on the A side of the loop is controlled by the proportional flow valve 7. The hot oil flow coming out of the A side is proportional to the opening of the proportional flow valve 7. The larger the opening, the greater the oil flow. The opening of the proportional flow valve 7 is determined by the controller based on the oil temperature and temperature rise rate fed back by the oil temperature sensor A10 set in the A side loop. After a specific algorithm calculation, the proportional signal is given to maintain the hot oil flow within a reasonable range, avoiding excessive temperature rise caused by too small hot oil flow, and avoiding power loss caused by excessive hot oil flow, thereby reducing equipment efficiency. At the same time, the controller can adjust the output flow of the oil replenishment pump in real time according to the opening signal of the proportional throttle valve 7 (that is, the hot oil flow of the system), so that the oil replenishment flow matches the hot oil flow, avoiding overflow loss caused by excessive oil replenishment flow.

[0029] Due to the total amount of cable used in deep-sea research winches, as the depth at which the load is lowered increases, the winch load also increases with the cable length. If the lowering speed is maintained constant or variable, the heat generated will increase. In the early stages of low loads, heat generation is low and total power is too low, resulting in low deployment efficiency. Later, during high loads, heat generation is low and total power is high, requiring excessive oil replenishment. To address these issues, the present invention proposes a motor adaptive control device and method based on system pressure and circuit temperature control.

[0030] The motor's variable mechanism is driven by a variable cylinder 14. The piston of variable cylinder 14 is connected to the variable mechanism. When the piston moves to the left, the displacement of hydraulic motor 18 decreases, and when the piston moves to the right, the displacement of hydraulic motor 18 increases. The left side of the piston is connected to an adjustable spring and is pushed rightward by spring 15. The right side of the piston is subjected to the hydraulic pressure in variable cylinder 14, generating a leftward thrust. The pressure in variable cylinder 14 is set by proportional pressure reducing valve 13. When the control signal of proportional pressure reducing valve 13 is 0, the variable piston of variable cylinder 14 moves to the right under the action of spring 15, and hydraulic motor 18 operates at maximum displacement. When proportional pressure reducing valve 13 gives a certain control signal, the piston, under the action of hydraulic pressure, overcomes the spring force and moves to the left a certain position until the forces are balanced. At this time, variable cylinder 14 will operate at a certain small displacement, thereby increasing the speed. Based on the above principle: the controller collects the pressure signal of the pressure sensor 12 and the temperature signals of the temperature sensor A10 and the temperature sensor B11 in real time. First, based on the pressure signal, it calculates the reasonable speed of the hydraulic motor 18 and gives the proportional pressure reducing valve 13 a control signal to make the winch 19 work at a speed suitable for the current load to ensure efficient operation; at the same time, the controller performs secondary control based on the collected temperature signal. If the temperature rise rate is too high, the displacement of the hydraulic motor 18 is increased and the speed is reduced to ensure that the circuit temperature is maintained within a reasonable range.

[0031] This electro-hydraulic control circuit and control method can be installed in the motor circuit of the winch on the Xiangyanghong 05 geological traction vessel in the form of a valve group and control module. By setting the upper temperature limit of the circuit through the controller, the effects of the utility model can be achieved. This utility model can not only be installed in newly developed equipment, but can also be made into a retrofit module, allowing existing equipment to be simply retrofitted through piping installation to achieve the same effects as the utility model.

Claims

1. An adaptive temperature control hydraulic circuit for a deep-sea scientific research winch, characterized by: The hydraulic system includes a motor, a main oil pump, a charge oil pump, a relief valve, a proportional flow valve, a three-way hydraulically controlled reversing valve, an oil temperature sensor, a pressure sensor, a proportional pressure reducing valve, a variable oil cylinder, a spring, a hydraulic motor, a winch, and a controller. The motor drives the main oil pump and the charge oil pump to operate. The main oil pump and the hydraulic motor form a hydraulic closed circuit. The main oil pump drives the hydraulic motor to operate in different directions by changing the output direction of high-pressure oil, thereby driving the winch to perform lifting and lowering operations. The hydraulic closed circuit is equipped with a three-way hydraulically controlled reversing valve and a pressure sensor. The two oil inlets of the three-way hydraulically controlled reversing valve are respectively connected to the oil temperature sensor. The oil return port of the three-way hydraulically controlled reversing valve is connected to the oil tank through the proportional flow valve and the relief valve. The hydraulic closed circuit is also connected to a variable oil cylinder. The piston of the variable oil cylinder is connected to the hydraulic motor. A spring is provided at the piston end of the variable oil cylinder. The pressure chamber of the variable oil cylinder is connected to the A and B chambers of the hydraulic motor respectively through a proportional pressure reducing valve and a check valve. The controller is respectively connected to the proportional flow valve, the oil temperature sensor, the pressure sensor, and the proportional pressure reducing valve.

2. The adaptive temperature control hydraulic circuit for deep-sea scientific research winch according to claim 1, characterized in that: When the B port of the main oil pump outputs high-pressure oil, oil enters the B port of the hydraulic motor and oil exits the A port, and the hydraulic motor drives the winch to reel in the cable.

3. The adaptive temperature control hydraulic circuit for deep-sea scientific research winch according to claim 1, characterized in that: When the A port of the main oil pump outputs high-pressure oil, oil enters the A port of the hydraulic motor and oil exits the B port, and the hydraulic motor drives the winch to release the cable.

4. The adaptive temperature control hydraulic circuit for deep-sea scientific research winch according to claim 1, characterized in that: The oil charge pump supplies oil to the hydraulic closed circuit through the one-way valve.

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