Container lifting and levelling control hydraulic system

Abstract

The utility model belongs to the technical field of hydraulic system, concretely relates to a container lifting and leveling control hydraulic system, and the system includes oil tank device, pump unit, check valve, overflow valve, pressure sensor, electromagnetic reversing valve, electromagnetic proportional reversing valve, hydraulic control check valve, horizontal push-out oil cylinder, outrigger oil cylinder and measurement and control system. Adopt the hydraulic control system provided by the utility model, the force when the container is descending mainly relies on the dead weight, the system only needs to provide a lower system pressure to open the counterbalance valve, greatly reduces the system energy consumption, the counterbalance valve is integrated on the outrigger oil cylinder, does not need pipeline connection, when the pipeline between the hydraulic system and the oil cylinder is damaged accidentally, the counterbalance force of the counterbalance valve can lock the outrigger oil cylinder in the safe position, the structure design of the upside-down installation of the outrigger oil cylinder and the piston rod as the outrigger, gives consideration to the lifting thrust of the container and the support strength of the outrigger, can adapt to the support demand under different ground conditions.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic system technology, specifically relating to a hydraulic system for controlling the lifting and leveling of containers. Background Technology

[0002] With the rapid development of my country's economy, transportation has become the lifeblood of the national economy. As a core carrier of transportation, the efficiency of container transshipment directly affects the speed of logistics. In ports and freight yards with specialized lifting equipment, the loading, unloading, and leveling of containers can be achieved using cranes, forklifts, and other tools. However, in field operations and temporary transshipment points where specialized lifting tools are lacking, the lifting, leveling, and positioning of containers have become industry challenges. Currently, there is no solution that can balance ease of operation, reliability, and energy efficiency. Utility Model Content

[0003] This utility model provides a hydraulic control system for lifting and leveling containers. The system mainly solves the problems of lifting, leveling and maintaining the position of containers, which can meet the needs of working scenarios where there are no cranes, forklifts and other lifting tools. It is simple to control and easy to use and maintain.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A hydraulic system for controlling the lifting and leveling of a container includes an oil tank, a pump unit, a check valve, a relief valve, a pressure sensor, a solenoid directional valve, a solenoid proportional directional valve, a hydraulically controlled check valve, a horizontal extension cylinder, outrigger cylinders, and a measurement and control system.

[0006] The oil tank device's oil outlet is connected to the pump unit's oil inlet;

[0007] The overflow valve is located between the oil outlet pipeline of the pump unit and the oil return port of the oil tank device;

[0008] The pressure sensor is located at the oil outlet of the one-way valve and is connected to the signal of the measurement and control system;

[0009] The oil outlet of the electromagnetic reversing valve is connected to the rodless chamber and rod chamber of the horizontal push-out cylinder, and the oil return port is connected to the oil tank.

[0010] The oil outlet of the electromagnetic proportional directional valve is connected to the rodless chamber and the rod chamber of the outrigger cylinder, and the oil return port is connected to the oil tank device. The hydraulic check valve is connected in series in the oil circuit between the electromagnetic proportional directional valve and the outrigger cylinder.

[0011] The horizontal extension cylinder is located in the telescopic beam inside the front and rear cavities of the container. Its fixed end is connected to the fixed end of the telescopic beam, and its movable end is connected to the movable end of the telescopic beam. The movable end of the telescopic beam is connected to the cylinder of the outrigger cylinder through a flange.

[0012] The outrigger cylinders are installed upside down at the four outriggers of the container, and their piston rods extend to serve as outriggers for the container. The outrigger cylinders integrate counterbalance valves, displacement sensors, and pressure sensors.

[0013] Furthermore, the pressure sensor and displacement sensor on the outrigger cylinder are respectively connected to the signal of the measurement and control system.

[0014] Furthermore, the container is equipped with a level, which is connected to the measurement and control system. Together with displacement sensors and pressure sensors PC-PC, it forms a closed-loop control for position and pressure.

[0015] Furthermore, it also includes a superimposed overflow valve, which is connected in parallel in the rod chamber oil circuit of the outrigger cylinder to provide stable low pressure for the outrigger cylinder to open the counterbalance valve.

[0016] Furthermore, the pump unit includes a motor and a gear pump. The motor drives the gear pump to operate. The oil inlet of the gear pump is connected to the oil tank device, and the oil outlet is connected to the check valve.

[0017] Furthermore, the electromagnetic proportional directional valve is equipped with an amplifier and electrically connected to the measurement and control system.

[0018] Furthermore, the fuel tank device is a closed space and integrates an air storage tank, which is filled with compressed air.

[0019] Furthermore, the measurement and control system receives and processes signals in real time, issues commands as required, and realizes closed-loop control of system displacement and closed-loop control of force.

[0020] The beneficial effects of this utility model are as follows:

[0021] (1) With the hydraulic control system provided by this utility model, the force of the container descending mainly relies on its own weight. The system only needs to provide a low system pressure to open the counterbalance valve, which greatly reduces the system energy consumption.

[0022] (2) In this utility model, the oil tank device integrates an air storage tank, which is filled with compressed air to keep the oil tank device under positive pressure. This can keep the hydraulic oil in the oil tank device at the bottom of the oil tank device, which can not only prevent the hydraulic oil from overflowing during container transportation and lifting and leveling, but also form a closed working environment to effectively prevent external impurities from entering the system.

[0023] (3) The counterbalancing valve is integrated on the outrigger cylinder and does not require pipeline connection. In the event of accidental damage to the pipeline between the hydraulic system and the cylinder, the counterbalancing force set by the counterbalancing valve can lock the outrigger cylinder in a safe position.

[0024] (4) The outrigger cylinder is installed upside down and the piston rod is used as the outrigger. The structural design takes into account both the upward thrust of the container and the support strength of the outrigger, and can adapt to the support requirements under different ground conditions.

[0025] (5) The container is equipped with a level, which can form a large closed-loop control; the hydraulic system and cylinders are installed inside the container, saving installation space. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the hydraulic control system of this utility model;

[0027] Figure 2 This is a schematic diagram of the horizontal ejection cylinder in the hydraulic control system of this utility model.

[0028] Figure 3 This is a top view of a shipping container.

[0029] Figure 4 A side view of the container with the outrigger cylinders retracted.

[0030] Figure 5 A schematic diagram illustrating the operation of the outrigger cylinders for lowering and leveling the container;

[0031] Figure 6 A side view of the container with the outrigger cylinders extended;

[0032] Figure 7 A schematic diagram illustrating the operation of the outrigger cylinders for lifting and leveling containers.

[0033] In the diagram: 1. Oil tank assembly; 1.1. Air storage tank; 2. Pump unit; 3. Check valve; 4. Relief valve; 5. Pressure sensor; 6.1. Solenoid directional valve one; 6.2. Solenoid directional valve two; 6.3. Solenoid directional valve three; 6.4. Solenoid directional valve four; 7.1. Solenoid proportional directional valve one; 7.2. Solenoid proportional directional valve two; 7.3. Solenoid proportional directional valve three; 7.4. Solenoid proportional directional valve four; 8. Hydraulic control check valve; 9. Stacked relief valve; 10. Horizontal extension cylinder; 11. Outrigger cylinder; 12. Measurement and control system. Detailed Implementation

[0034] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0035] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described in detail here, but the embodiments of the present invention are not limited to the following embodiments.

[0036] Example: A hydraulic system for controlling the lifting and leveling of a container includes an oil tank, a pump unit 2, a check valve 3, an overflow valve 4, a pressure sensor 5, a solenoid directional valve, a solenoid proportional directional valve, a hydraulically controlled check valve, a horizontal extension cylinder 10, a support leg cylinder 11, and a measurement and control system 12.

[0037] The oil tank device 1 has its outlet connected to the pump unit 2's inlet. The oil tank device 1 is a storage device for the hydraulic system's transmission medium, primarily for oil storage and heat dissipation. The oil tank device 1 is a closed space that integrates an air tank 1.1, filled with compressed air. This compressed air is insoluble in hydraulic oil, maintaining positive pressure in the oil tank device 1. This keeps the hydraulic oil at the bottom of the tank, preventing spillage during container transport, lifting, and leveling, and also preventing external impurities from entering the hydraulic system.

[0038] Pump unit 2 mainly consists of a motor and a gear pump, providing a power source for the hydraulic system. The motor drives the gear pump, with the gear pump inlet connected to the oil tank device 1 and the outlet connected to the check valve 3.

[0039] The three check valves allow oil to flow in only one direction, preventing the pump unit from reversing and causing shock.

[0040] The overflow valve 4 is located between the oil outlet pipeline of the pump unit 2 and the oil return port of the oil tank device 1, and is used to set the system working pressure.

[0041] Pressure sensor 5 is located at the oil outlet of check valve 3 and is connected to the control system 12; it feeds back the system pressure to the control system 12 in real time.

[0042] The horizontal extension cylinder 10 is located in the telescopic beam inside the front and rear accommodating cavities of the container. Its fixed end is connected to the fixed end of the telescopic beam, and its movable end is connected to the movable end of the telescopic beam. The movable end of the telescopic beam is connected to the cylinder of the outrigger cylinder 11 through a flange.

[0043] Outrigger cylinders 11 are inverted and installed at the four outriggers of the container. When their piston rods are extended, they function as outriggers of the container. Outrigger cylinders 11 integrate counterbalance valves, displacement sensors LC1-LC4, and pressure sensors PC2-PC5. Pressure sensors PC2-PC5 and displacement sensors LC1-LC4 on outrigger cylinders 11 are connected to the control and measurement system 12. Displacement sensors LC1-LC4 can monitor and provide feedback on the position of the outrigger cylinder in real time, while pressure sensors PC2-PC5 can monitor and provide feedback on the pressure in the rodless chamber of outrigger cylinder 11 in real time, enabling the establishment of a dual closed-loop control system for position and pressure.

[0044] The electromagnetic directional valves (electromagnetic directional valve 1 6.1, electromagnetic directional valve 2 6.2, electromagnetic directional valve 3 6.3 and electromagnetic directional valve 4 6.4) have their oil outlets connected to the rodless chamber and rod chamber of the horizontal push-out cylinder 10, and their return ports connected to the oil tank device 1.

[0045] The electromagnetic proportional directional valves (electromagnetic proportional directional valve 1 7.1, electromagnetic proportional directional valve 2 7.2, electromagnetic proportional directional valve 3 7.3 and electromagnetic proportional directional valve 4 7.4) have their oil outlets connected to the rodless chamber and rod chamber of the outrigger cylinder 11, and their oil return ports connected to the oil tank device 1; the electromagnetic proportional directional valves are equipped with amplifiers and are electrically connected to the measurement and control system 12.

[0046] The hydraulic check valve 8 is connected in series in the oil circuit between the electromagnetic proportional directional valve and the outrigger cylinder 11, which can lock the outrigger cylinder 11 in the working position.

[0047] In addition, this hydraulic control system also includes a superimposed relief valve 9, which is connected in parallel in the rod chamber oil circuit of the outrigger cylinder 11 to provide stable low pressure for the outrigger cylinder 11 to open the counterbalance valve. The superimposed relief valve 9 is set to 8MPa in this system.

[0048] The container is equipped with a level, which is connected to the measurement and control system 12. Together with displacement sensors and pressure sensors, it forms a closed-loop control for position and pressure.

[0049] The measurement and control system 12 includes a power cabinet and a control cabinet, which are used to receive and process various signals in real time, issue various commands as required, and realize closed-loop control of system displacement and closed-loop control of force.

[0050] The working principle of this utility model is as follows:

[0051] Once the container is loaded onto the transport vehicle and arrives at the designated location, it needs to be unloaded from the vehicle and installed in the designated position. At this time, pump unit 2 starts, providing oil supply and establishing pressure in the hydraulic system. Electromagnets DT1 (6.1), DT3 (6.2), DT5 (6.3), and DT7 (6.4) of the electromagnetic directional valves are energized. System pressure oil enters the rodless chamber of the horizontal extension cylinder 10 through check valve 3 and the electromagnetic directional valves. Hydraulic oil in the rod chamber of the horizontal extension cylinder 10 returns to the hydraulic oil tank through the electromagnetic directional valves. The piston rod of the horizontal extension cylinder 10 extends, driving the movable end of the crossbeam to extend, thereby pushing the outrigger cylinder 11 to the working position (action as follows). Figure 2 (As shown), then the solenoids DT1 (6.1), DT3 (6.2), DT5 (6.3), and DT7 (6.4) of the solenoid directional valves are de-energized (the container status is as shown). Figure 3 , Figure 4 (As shown).

[0052] The proportional solenoids BL2 (7.1), BL4 (7.2), BL6 (7.3), and BL8 (7.4) of the electromagnetic proportional directional valves are energized, applying a signal. System pressure oil enters the rodless chamber of outrigger cylinder 11 through check valves 3, 7.1-7.4, and the integrated counterbalance valve of outrigger cylinder 11. Hydraulic oil in the rod chamber of outrigger cylinder 11 returns to the hydraulic tank through the electromagnetic proportional directional valves, extending the piston rod of outrigger cylinder 11. At this time, the displacement sensors LC1-LC4 integrated in outrigger cylinder 11 feed back displacement signals to the measurement and control system 12. The measurement and control system 12, based on the position of each outrigger cylinder 11, provides a given signal to each corresponding proportional directional valve, forming a position closed loop, ensuring synchronized movement of the outrigger cylinders 11 (actions such as...). Figure 5 As shown). After the outrigger cylinder 11 contacts the ground, the piston rod continues to extend, lifting the container and detaching it from the transport vehicle (action as shown). Figure 6 As shown), the transport vehicle can then be driven away. During this process, if the ground on which the container is placed is uneven, the container will not be level. The level on the container will then send a signal to the measurement and control system 12. The measurement and control system 12 will send a signal, which, together with the displacement sensors LC1-LC4 and pressure sensors PC2-PC5 integrated in the outrigger cylinder 11, forms a large closed loop of position and pressure to keep the container level.

[0053] The proportional solenoids BL1 (7.1), BL3 (7.2), BL5 (7.3), and BL7 (7.4) of the electromagnetic proportional directional valve are energized, applying a signal. System pressure oil enters the rod chamber of the outrigger cylinder 11 through check valve 3 and the electromagnetic proportional directional valve. The pressure oil in the rod chamber of the outrigger cylinder 11 opens the counterbalance valve integrated in the outrigger cylinder 11, allowing the hydraulic oil in the rodless chamber of the outrigger cylinder 11 to flow through the valve. The counterbalance valve and electromagnetic proportional directional valve integrated in the outrigger cylinder 11 return to the hydraulic oil tank. The piston rod of the outrigger cylinder 11 retracts under the weight of the container. At this time, the displacement sensors LC1-LC4 integrated in the outrigger cylinder 11 feed back displacement signals to the measurement and control system 12. The measurement and control system 12, based on the position of each outrigger cylinder 11, provides a setpoint signal to each corresponding electromagnetic proportional directional valve, forming a position closed loop. This controls the energization, de-energization, and setpoint signal of the electromagnetic proportional directional valve, ensuring synchronized movement of the outrigger cylinder 11 (actions such as...). Figure 6(As shown). After the container descends to the designated position, the proportional solenoids BL1 (7.1), BL3 (7.2), BL5 (7.3), and BL7 (7.4) of the electromagnetic proportional directional valves are de-energized, and the hydraulic check valve 8 locks the outrigger cylinder 11, thus maintaining the container's position.

[0054] When the container needs to be moved, the proportional solenoids BL2 (7.1), BL4 (7.2), BL6 (7.3), and BL8 (7.4) of the electromagnetic proportional directional valves are energized, applying a signal. System pressure oil enters the rodless chamber of outrigger cylinder 11 through check valve 3, the electromagnetic proportional directional valves, and the check valve of the integrated counterbalance valve in outrigger cylinder 11. Hydraulic oil in the rod chamber of outrigger cylinder 11 returns to the hydraulic tank through the electromagnetic proportional directional valve, extending the piston rod of outrigger cylinder 11. At this time, the displacement sensors LC1-LC4 integrated in outrigger cylinder 11 feed back displacement signals to the measurement and control system 12. The measurement and control system 12, based on the position of each outrigger cylinder 11, provides a given signal to each corresponding proportional directional valve, forming a position closed loop, ensuring synchronized movement of the outrigger cylinders 11. (Action as follows) Figure 7(As shown) After the container is raised to a certain height, the transport vehicle is driven under the container. The proportional solenoids BL1 (7.1), BL3 (7.2), BL5 (7.3), and BL7 (7.4) of the electromagnetic proportional directional valves are energized, applying a signal. System pressure oil enters the rod chamber of the outrigger cylinder 11 through the check valve 3 and the electromagnetic proportional directional valves. The pressure oil in the rod chamber of the outrigger cylinder 11 opens the counterbalance valve integrated in the outrigger cylinder 11, allowing hydraulic oil in the rodless chamber of the outrigger cylinder 11 to flow... The outrigger cylinder 11 returns to the hydraulic tank via the integrated counterbalance valve and electromagnetic proportional directional valve. Under the weight of the container, the piston rod of outrigger cylinder 11 retracts. At this time, the displacement sensors LC1-LC4 integrated in outrigger cylinder 11 feed back displacement signals to the measurement and control system 12. The measurement and control system 12, based on the position of each outrigger cylinder 11, provides a given signal to each corresponding electromagnetic proportional directional valve, forming a position closed loop. This controls the energization, de-energization, and given signals of the electromagnetic proportional directional valves, ensuring synchronized movement of the outrigger cylinders 11. After the container lands on the transport vehicle, the piston rod of outrigger cylinder 11 continues to retract to the bottom. The proportional electromagnets BL1 (7.1), BL3 (7.2), BL5 (7.3), and BL7 (7.4) of electromagnetic proportional directional valves are de-energized, and the hydraulic check valve 8 locks the outrigger cylinders. When the solenoids DT2 (6.1), DT4 (6.2), DT6 (6.3), and DT8 (6.4) of the electromagnetic directional valves are energized, the system pressure oil enters the rod chamber of the horizontal extension cylinder 10 through the check valve 3 and the electromagnetic directional valves. The hydraulic oil in the rodless chamber of the horizontal extension cylinder 10 returns to the hydraulic oil tank through the electromagnetic directional valves. The piston rod of the horizontal extension cylinder 10 retracts, pulling the outrigger cylinder 11 to its initial position. At this point, the transport vehicle can move the container to another work location.

[0055] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A container lifting and leveling control hydraulic system, comprising an oil tank device (1), a pump unit (2), a check valve (3), an overflow valve (4), a pressure sensor (5), an electromagnetic directional valve, an electromagnetic proportional directional valve, a hydraulically controlled check valve, a horizontal extension cylinder (10), a support leg cylinder (11), and a measurement and control system (12), characterized in that, The oil outlet of the oil tank device (1) is connected to the oil inlet of the pump unit (2); The overflow valve (4) is located between the oil outlet pipeline of the pump unit (2) and the oil return port of the oil tank device (1); The pressure sensor (5) is located at the oil outlet of the check valve (3) and is connected to the signal of the measurement and control system (12); The electromagnetic reversing valve outlet is connected to the rodless chamber and rod chamber of the horizontal push-out cylinder, and the return port is connected to the oil tank (1). The oil outlet of the electromagnetic proportional directional valve is connected to the rodless chamber and the rod chamber of the outrigger cylinder (11), and the oil return port is connected to the oil tank device (1). The hydraulic control check valve is connected in series in the oil circuit between the electromagnetic proportional directional valve and the outrigger cylinder (11). The horizontal extension cylinder (10) is located in the telescopic beam inside the front and rear accommodating cavities of the container. Its fixed end is connected to the fixed end of the telescopic beam, and its movable end is connected to the movable end of the telescopic beam. The movable end of the telescopic beam is connected to the cylinder of the outrigger cylinder (11) through a flange. Outrigger cylinders (11) are installed upside down at the four outriggers of the container and are used as outriggers of the container when their piston rods are extended; the outrigger cylinders integrate counterbalance valves, displacement sensors and pressure sensors.

2. The container lifting and leveling control hydraulic system according to claim 1, characterized in that, The pressure sensor and displacement sensor on the outrigger cylinder are respectively connected to the signal of the measurement and control system (12).

3. The container lifting and leveling control hydraulic system according to claim 1, characterized in that, The container is equipped with a level, which is connected to the measurement and control system (12) and forms a position and pressure closed-loop control in combination with displacement sensors and pressure sensors.

4. The container lifting and leveling control hydraulic system according to claim 1, characterized in that, It also includes a superimposed overflow valve (9), which is connected in parallel to the rod chamber oil circuit of the outrigger cylinder (11) to provide stable low pressure for the outrigger cylinder (11) to open the counterbalance valve.

5. The container lifting and leveling control hydraulic system according to claim 1, characterized in that, The pump unit (2) includes a motor and a gear pump. The motor drives the gear pump to operate. The oil inlet of the gear pump is connected to the oil tank device (1), and the oil outlet is connected to the check valve (3).

6. The container lifting and leveling control hydraulic system according to claim 1, characterized in that, The electromagnetic proportional directional valve (7) is equipped with an amplifier and is electrically connected to the measurement and control system (12).

7. The container lifting and leveling control hydraulic system according to claim 1, characterized in that, The oil tank device (1) is a closed space and integrates an air storage tank (1.1), which is filled with compressed air.

8. The container lifting and leveling control hydraulic system according to claim 1, characterized in that, The measurement and control system receives and processes signals in real time, issues commands as required, and realizes closed-loop control of system displacement and closed-loop control of force.

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