Hydraulic lifting system of boarding bridge

Abstract

The utility model relates to the technical field of boarding bridge lifting, in particular to a boarding bridge hydraulic lifting system which comprises a plunger type cylinder, a cavity is arranged in the plunger type cylinder, a plunger is arranged in the cavity, and the boarding bridge hydraulic lifting system is characterized by further comprising a motor, a pump set, an oil tank, a first electromagnetic valve set and a second control valve set. The plunger divides the cavity into a rodless cavity and a rod cavity, the pump set is driven by the motor, the first electromagnetic valve set comprises an overflow valve, a one-way valve, a speed regulating valve, a first electromagnetic valve and an adjusting electromagnetic valve, an input port of the one-way valve is connected with an oil outlet of the pump set through a first pipeline, and an output port of the one-way valve is connected with the second control valve set through a second pipeline. The upper end of the first rodless cavity oil return pipeline is connected with a rodless cavity of the plunger type cylinder through the second control valve set, the lower end of the first rodless cavity oil return pipeline is connected with the oil tank, and a first electromagnetic valve and a speed regulating valve are installed on the first rodless cavity oil return pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of boarding bridge lifting, in particular to a hydraulic lifting system for a boarding bridge. Background Art

[0002] Existing boarding bridges generally use piston cylinders for lifting, which have potential safety hazards of internal leakage, and use a large number of hydraulic components and pipelines, resulting in a high failure rate. After retrieval, Chinese Patent CN102996565A discloses a lifting plunger cylinder structure for a boarding bridge. The lifting plunger cylinder structure of the boarding bridge is characterized in that: it includes a plunger cylinder, a cavity is provided in the plunger cylinder, and a guide sleeve is provided on the plunger cylinder. A plunger is arranged in the cavity and is in sliding and sealing cooperation with the inner wall of the guide sleeve; a support ring is provided on the inner wall of the guide sleeve, and the support ring is in sliding and sealing cooperation with the plunger. A guide ring is arranged at the lower end of the plunger and is in sliding cooperation with the inner wall of the plunger cylinder. The plunger cylinder supports and guides the plunger at two points up and down through the support ring and the guide ring. An integrated oil circuit is arranged at the bottom of the plunger cylinder. A solenoid valve is arranged on the integrated oil circuit, and the solenoid valve is connected to the oil circuit to control the upward movement and rapid downward movement of the plunger. A pilot-operated check valve is arranged on the integrated oil circuit, and the pilot-operated check valve is connected to the oil circuit and is arranged in parallel with the solenoid valve to control the downward movement of the plunger. A plurality of first sealing rings are arranged in the guide sleeve, and an exhaust device is arranged on the guide sleeve.

[0003] The deficiencies of the above patent are as follows: First, the above patent uses a pilot-operated check valve. If the pilot-operated check valve is stuck by impurities or fails, hydraulic oil enters the plunger cylinder through the pilot-operated check valve, which will cause the plunger cylinder to fall automatically, resulting in the sudden descent of the boarding bridge and safety accidents. Second, when the above patent is used, the oil pressure of the hydraulic system is prone to be too high, damaging the hydraulic system. Third, relying solely on the solenoid valve in the above patent, the descent speed of the boarding bridge is too fast, prone to safety accidents. Summary of the Invention

[0004] The purpose of the utility model is to solve the deficiencies of the existing technology and provide a hydraulic lifting system for a boarding bridge with a simple structure, convenient adjustment, an overflow valve to protect the hydraulic system, stable lifting of the boarding bridge, and high safety.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A hydraulic lifting system for a boarding bridge includes a plunger cylinder. A cavity is provided in the plunger cylinder, and a guide sleeve is provided on the plunger cylinder. A plunger is arranged in the cavity, and the plunger is in sliding and sealing cooperation with the inner wall of the guide sleeve. The hydraulic lifting system for the boarding bridge is characterized in that: the hydraulic lifting system for the boarding bridge further includes a motor, a pump set, an oil tank, a first solenoid valve group, and a second control valve group. The plunger divides the cavity into a rodless cavity and a rod cavity.

[0007] The pump set is driven by an electric motor. The first solenoid valve group includes an overflow valve, a check valve, a speed control valve, a first solenoid valve, and an adjustment solenoid valve. The oil inlet of the overflow valve is connected to the oil outlet of the pump set through a pipeline, and the oil outlet of the overflow valve is connected to the fuel tank through a pipeline. This is to facilitate the overflow valve to relieve pressure when the output oil pressure of the pump set is greater than the set pressure of the overflow valve, preventing destructive losses to the entire hydraulic system. The oil inlet of the pump set is connected to the fuel tank. The input port of the check valve is connected to the oil outlet of the pump set through a first pipeline, and the output port of the check valve is connected to the second control valve group through a second pipeline. The second control valve group is installed on the connecting pipeline of the rodless cavity of the plunger cylinder. A first rodless cavity oil return pipeline is provided on one side of the first pipeline, and an adjustment pipeline is provided between the first pipeline and the first rodless cavity oil return pipeline. The upper end of the first rodless cavity oil return pipeline is connected to the rodless cavity of the plunger cylinder through the second control valve group, and the lower end is connected to the fuel tank. A first solenoid valve is installed on the first rodless cavity oil return pipeline. A speed control valve is provided between the first solenoid valve and the second control valve group. The speed control valve is fixed on the first rodless cavity oil return pipeline. An adjustment solenoid valve is installed on the adjustment pipeline. The oil inlet of the adjustment solenoid valve is connected to the oil outlet of the pump set through the adjustment pipeline and the first pipeline, and the oil outlet of the adjustment solenoid valve is connected to the oil outlet of the first solenoid valve through the adjustment pipeline and the first rodless cavity oil return pipeline. This is to facilitate when the adjustment solenoid valve receives the plunger cylinder rising action instruction, the adjustment solenoid valve closes, and the oil output by the pump set reaches the rodless cavity of the plunger cylinder through the check valve, the second pipeline, and the second control valve group, driving the plunger to move upward. When the second control valve group and the first solenoid valve receive the plunger cylinder descending action instruction, the hydraulic oil in the rodless cavity of the plunger cylinder returns to the fuel tank through the second control valve group, the first rodless cavity oil return pipeline, and the first solenoid valve. The speed control valve can make the pressure difference between the inlet and outlet constant and the flow rate constant, making the boarding bridge descending action stable.

[0008] On one side of the first rodless cavity oil return pipeline of the present utility model, a second rodless cavity oil return pipeline is provided. The upper end of the second rodless cavity oil return pipeline is connected to the rodless cavity of the plunger cylinder through the second control valve group, and the lower end is connected to the fuel tank. A second solenoid valve is installed on the second rodless cavity oil return pipeline. This is to facilitate when the plunger needs to descend quickly, when the second control valve group and the second solenoid valve receive the action instruction, the hydraulic oil in the rodless cavity of the plunger cylinder returns to the fuel tank through the second control valve group, the second rodless cavity oil return pipeline, and the second solenoid valve, realizing the quick descent of the boarding bridge.

[0009] The second control valve group of the present utility model includes a plunger control solenoid valve to control the flow direction of the hydraulic oil through the plunger control solenoid valve.

[0010] The second control valve group of the utility model includes a plunger control solenoid valve and a stop valve. The stop valve is arranged in parallel with the plunger control solenoid valve so that when a failure occurs in the system power source or electrical control, the stop valve and the first solenoid valve can be manually controlled to enable the hydraulic oil in the plunger cylinder to slowly flow back to the fuel tank under the action of the gravity of the boarding bridge, completing the emergency descent of the boarding bridge.

[0011] A first filter is provided between the oil inlet of the pump group of the utility model and the first solenoid valve group to filter the hydraulic oil through the filter, improve the service life of the hydraulic oil, and reduce the loss of the equipment.

[0012] A second filter is provided between the oil outlet of the overflow valve of the utility model and the connection to the fuel tank to filter the hydraulic oil through the filter, improve the service life of the hydraulic oil, and reduce the loss of the equipment.

[0013] A third filter is provided between the oil inlet of the pump group of the utility model and the fuel tank to filter the hydraulic oil through the filter, improve the service life of the hydraulic oil, and reduce the loss of the equipment.

[0014] Due to adopting the above structure, the utility model has the advantages of simple structure, high safety, stable performance, controllable system oil pressure, and stable lifting of the boarding bridge. Description of the Drawings

[0015] Figure 1 is the structural schematic diagram of the utility model.

[0016] Figure 2 is the cross-sectional view of the plunger cylinder of the utility model.

[0017] Figure 3 is the hydraulic flow chart of the utility model.

[0018] Reference Numerals: plunger cylinder 1, plunger 2, motor 3, pump group 4, fuel tank 5, first solenoid valve group 6, second control valve group 7, rodless cavity 8, rod cavity 9, overflow valve 10, check valve 11, speed control valve 12, first solenoid valve 13, regulating solenoid valve 14, first pipeline 15, second pipeline 16, first rodless cavity oil return pipeline 17, regulating pipeline 18, second rodless cavity oil return pipeline 19, second solenoid valve 20, plunger control solenoid valve 21, stop valve 22, first filter 23, second filter 24, third filter 25. Detailed Description of the Preferred Embodiments

[0019] The following further describes in detail the specific embodiments of the utility model in conjunction with the drawings.

[0020] A boarding bridge hydraulic lifting system, comprising a plunger cylinder 1. There is a cavity inside the plunger cylinder 1 and a guide sleeve is provided on the plunger cylinder 1. A plunger 2 is arranged inside the cavity, and the plunger 2 is in sliding sealing fit with the inner wall of the guide sleeve. It is characterized in that: the boarding bridge hydraulic lifting system further includes a motor 3, a pump set 4, an oil tank 5, a first solenoid valve group 6 and a second control valve group 7. The plunger 2 divides the cavity into a rodless cavity 8 and a rod cavity 9. The pump set 4 is driven by the motor 3. The first solenoid valve group 6 includes a relief valve 10, a check valve 11, a speed control valve 12, a first solenoid valve 13 and an adjustment solenoid valve 14. The oil inlet of the relief valve 10 is connected to the oil outlet of the pump set 4 through a pipeline, and the oil outlet of the relief valve 10 is connected to the oil tank 5 through a pipeline, so as to facilitate that when the output oil pressure of the pump set is greater than the set pressure of the relief valve, the relief valve relieves pressure to prevent destructive losses to the entire hydraulic system. The oil inlet of the pump set 4 is connected to the oil tank 5. The input port of the check valve 11 is connected to the oil outlet of the pump set 4 through a first pipeline 15, and the output port of the check valve 11 is connected to the second control valve group 7 through a second pipeline 16. The second control valve group 7 is installed on the connecting pipeline of the rodless cavity 8 of the plunger cylinder 1. A first rodless cavity oil return pipeline 17 is provided on one side of the first pipeline 15. An adjustment pipeline 18 is provided between the first pipeline 15 and the first rodless cavity oil return pipeline 17. The upper end of the first rodless cavity oil return pipeline 17 is connected to the rodless cavity 8 of the plunger cylinder 1 through the second control valve group 7, and the lower end is connected to the oil tank 5. A first solenoid valve 13 is installed on the first rodless cavity oil return pipeline 17. A speed control valve 12 is provided between the first solenoid valve 13 and the second control valve group 7. The speed control valve 12 is fixed on the first rodless cavity oil return pipeline 17. An adjustment solenoid valve 14 is installed on the adjustment pipeline 18. The oil inlet of the adjustment solenoid valve 14 is connected to the oil outlet of the pump set 4 through the adjustment pipeline 18 and the first pipeline 15, and the oil outlet of the adjustment solenoid valve 14 is connected to the oil outlet of the first solenoid valve 13 through the adjustment pipeline 18 and the first rodless cavity oil return pipeline 17, so as to facilitate that when the adjustment solenoid valve receives the plunger cylinder rising action instruction, the adjustment solenoid valve closes, and the oil output by the pump set reaches the rodless cavity of the plunger cylinder through the check valve, the second pipeline and the second control valve group, driving the plunger to move upward. When the second control valve group and the first solenoid valve receive the plunger cylinder descending action instruction, the hydraulic oil in the rodless cavity of the plunger cylinder returns to the oil tank through the second control valve group, the first rodless cavity oil return pipeline and the first solenoid valve. The speed control valve can make the pressure difference between the inlet and outlet constant and the flow rate constant, so that the descending action of the boarding bridge is stable.

[0021] On one side of the first rodless chamber oil return pipeline 17 of the present utility model, there is a second rodless chamber oil return pipeline 19. The upper end of the second rodless chamber oil return pipeline 19 is connected to the rodless chamber 8 of the plunger cylinder 1 through a second control valve group 7, and the lower end is connected to the oil tank 5. A second solenoid valve 20 is installed on the second rodless chamber oil return pipeline 19. When the plunger needs to descend rapidly, when the second control valve group and the second solenoid valve receive action instructions, the hydraulic oil in the rodless chamber of the plunger cylinder returns to the oil tank through the second control valve group, the second rodless chamber oil return pipeline, and the second solenoid valve, realizing the rapid descent of the boarding bridge.

[0022] The second control valve group 7 of the present utility model includes a plunger control solenoid valve 21 to control the flow direction of the hydraulic oil through the plunger control solenoid valve.

[0023] The second control valve group 7 of the present utility model includes a plunger control solenoid valve 21 and a stop valve 22. The stop valve 22 is arranged in parallel with the plunger control solenoid valve 21. When a failure occurs in the system power source or electrical control, the stop valve and the first solenoid valve can be manually controlled, so that the hydraulic oil in the plunger cylinder slowly flows back to the oil tank under the action of the gravity of the boarding bridge, completing the emergency descent of the boarding bridge.

[0024] Between the oil inlet of the pump group 4 of the present utility model and the first solenoid valve group 6, there is a first filter 23 to filter the hydraulic oil through the filter, improve the service life of the hydraulic oil, and reduce the loss of the equipment.

[0025] Between the oil outlet of the overflow valve 10 of the present utility model and the connection with the oil tank 5, there is a second filter 24 to filter the hydraulic oil through the filter, improve the service life of the hydraulic oil, and reduce the loss of the equipment.

[0026] Between the oil inlet of the pump group 4 of the present utility model and the oil tank 5, there is a third filter 25 to filter the hydraulic oil through the filter, improve the service life of the hydraulic oil, and reduce the loss of the equipment.

[0027] As shown in the Figure 1 appendix, the boarding bridge of the prior art includes a cross beam, inner and outer sleeves arranged on both sides of the cross beam. The inner sleeve is fixed to the cross beam, the outer sleeve is fixed to the boarding bridge passage, and the outer sleeve is slidably connected to the inner sleeve. This part is the same as the prior art and will not be elaborated.

[0028] In the present utility model, the motor 3, the pump set 4, the fuel tank 5, the first solenoid valve group 6, and the second control valve group 7 are all installed on the cross beam of the boarding bridge. The pump set 4 is composed of two or more pumps in parallel, and can be selected and set according to needs. Two plunger cylinders 1 are arranged on both sides of the upper end of the cross beam. A plunger rod is arranged in the cavity of the plunger cylinder 1. The lower end of the plunger rod is fixedly connected to the plunger 2, and the upper end of the plunger rod passes through the plunger 2 and is connected to the outer sleeve of the boarding bridge. When the plunger 2 moves up and down, it drives the plunger rod to move up and down, and the plunger rod drives the boarding bridge passage to move up and down through the outer sleeve, realizing the lifting of the boarding bridge.

[0029] The motor 3, the pump set 4, the fuel tank 5, the first solenoid valve group 6, and the second control valve group 7 can all be connected to the control system of the boarding bridge. The control system of the boarding bridge is such as the PLC control system.

[0030] As shown in the appendix Figure 2 In the present utility model, the plunger 2 divides the cavity of the plunger cylinder 1 into a rodless cavity 8 and a rod cavity 9. The rodless cavity 8 of the plunger cylinder 1 is connected to the second control valve group 7.

[0031] As shown in the appendix Figure 3 As shown in the appendix, the overflow valve 10, the check valve 11, the throttle valve 12, the first solenoid valve 13, the regulating solenoid valve 14, and the second solenoid valve 20 constitute the first solenoid valve group 7. The oil inlet of the first solenoid valve group 7 is connected to the oil outlet of the pump set 4, and the oil return port of the first solenoid valve group 7 is connected to the fuel tank 5 through the second filter 24. The oil outlet of the first solenoid valve group 7 is connected to the rodless cavity 8 of the plunger cylinder 1 through the second control valve group 7.

[0032] Filters can be arranged between the first solenoid valve group 7 and the pump set 4, and between the pump set 4 and the fuel tank 5 to facilitate the filtration of hydraulic oil.

[0033] In the first solenoid valve group 6, the oil outlet of the regulating solenoid valve 14 is connected to the oil outlet of the first solenoid valve 13 through the regulating pipeline 18 and the first rodless cavity oil return pipeline 17.

[0034] The oil inlet of the first solenoid valve 13 is connected to the oil outlet of the throttle valve 12, and the oil inlet of the throttle valve 12 is connected to the second control valve group 7 through a pipeline.

[0035] The oil outlet of the first solenoid valve 13 is connected to the fuel tank 5 through a filter.

[0036] The oil inlet of the second solenoid valve 13 is connected to the rodless cavity 8 of the plunger cylinder 1 through the second control valve group 7, and the oil outlet of the second solenoid valve 13 is connected to the fuel tank 5 through a filter.

[0037] In use, the pump set 4 is driven by an electric motor to draw hydraulic oil from the oil tank 5, pass through the filter and reach the inlet of the first solenoid valve group 6. An overflow valve 10 is provided at the inlet. When the output oil pressure of the pump set 4 is greater than the set pressure of the overflow valve 10, the overflow valve 10 relieves pressure to keep the system pressure at or below the set value, preventing destructive losses to the entire hydraulic system.

[0038] When the regulating solenoid valve 14 receives the boarding bridge ascending instruction, the regulating solenoid valve 14 closes. The oil output by the pump set 4 passes through the check valve 11, the second pipeline 16, the plunger control solenoid valve 21 and reaches the rodless cavity 8 of the plunger cylinder 1, driving the plunger 2 to move upward.

[0039] When the plunger control solenoid valve 21 and the first solenoid valve 13 receive the boarding bridge descending instruction, the hydraulic oil in the rodless cavity 8 of the plunger cylinder 1 returns to the oil tank 5 through the plunger control solenoid valve 21, the first rodless cavity oil return pipeline 17 and the first solenoid valve 13. The speed control valve 12 can keep the pressure difference between the inlet and outlet constant and the flow rate constant, making the descending action of the boarding bridge stable.

[0040] When the safety boot placed under the aircraft cabin door at the boarding bridge connection port is touched, the boarding bridge needs to descend quickly to prevent damage to the aircraft cabin door. At this time, when the plunger control solenoid valve 21 and the second solenoid valve 20 receive the action instruction, the hydraulic oil in the rodless cavity 8 of the plunger cylinder 1 returns to the oil tank 5 through the plunger control solenoid valve 21, the second rodless cavity oil return pipeline 19 and the second solenoid valve 20, realizing the quick descent of the boarding bridge.

[0041] When an emergency descent is required due to a failure of the system power source or electrical control, the manual control stop valve 22 and the first solenoid valve 13 can be used to make the hydraulic oil in the plunger cylinder 1 slowly flow back to the oil tank 5 under the action of the gravity of the boarding bridge, completing the emergency descent of the boarding bridge.

[0042] Compared with the prior art, first, the present utility model uses a check valve 11 and a regulating solenoid valve 14 to realize the ascent of the boarding bridge, and there will be no phenomenon of automatic falling of the plunger cylinder, with good safety and stable performance; second, the present utility model is provided with an overflow valve 10 to prevent the hydraulic oil pressure output by the pump set from being too high and damaging the hydraulic system; third, the present utility model is provided with a first rodless cavity oil return pipeline 17, and a speed control valve 12 and a first solenoid valve 13 are provided on the first rodless cavity oil return pipeline 17. By adjusting the pressure difference at the inlet and outlet of the speed control valve 12, the pressure difference and the flow rate are kept constant, ensuring the stable lifting of the boarding bridge. At the same time, when an accident occurs suddenly and the boarding bridge needs to descend quickly, the hydraulic oil in the rodless cavity 8 of the plunger cylinder 1 returns to the oil tank 5 through the plunger control solenoid valve 21, the second rodless cavity oil return pipeline 19 and the second solenoid valve 20, realizing the quick descent of the boarding bridge. Fourth, the present utility model is not only provided with a first solenoid valve group 6, but also provided with a second control valve group 7. After the boarding bridge ascends, the plunger control solenoid valve 21 is used to ensure that the hydraulic oil in the rodless cavity does not flow back, ensuring that the boarding bridge is in a stable rising state and does not shake.

[0043] Due to the adoption of the above structure, the utility model has the advantages of simple structure, high safety, stable performance, controllable system oil pressure, and smooth lifting of the boarding bridge.

Claims

1. A hydraulic lifting system for an air bridge, comprising a plunger cylinder (1). A cavity is provided inside the plunger cylinder (1), and a plunger (2) is provided inside the cavity. It is characterized in that: The boarding bridge hydraulic lifting system further includes a motor (3), a pump set (4), an oil tank (5), a first solenoid valve group (6), and a second control valve group (7). The plunger (2) divides the cavity into a rodless cavity (8) and a rod cavity (9). The pump set (4) is driven by the motor (3). The first solenoid valve group (6) includes an overflow valve (10), a check valve (11), a first solenoid valve (13), and an adjustment solenoid valve (14). The inlet of the overflow valve (10) is connected to the outlet of the pump set (4) through a pipeline, and the outlet of the overflow valve (10) is connected to the oil tank (5) through a pipeline. The inlet of the pump set (4) is connected to the oil tank (5). The input port of the check valve (11) is connected to the outlet of the pump set (4) through a first pipeline (15), and the output port of the check valve (11) is connected to the second control valve group (7) through a second pipeline (16). The second control valve group (7) is installed on the connecting pipeline of the rodless cavity (8) of the plunger cylinder (1). A first rodless cavity oil return pipeline (17) is provided on one side of the first pipeline (15). An adjustment pipeline (18) is provided between the first pipeline (15) and the first rodless cavity oil return pipeline (17). The upper end of the first rodless cavity oil return pipeline (17) is connected to the rodless cavity (8) of the plunger cylinder (1) through the second control valve group (7), and the lower end is connected to the oil tank (5). A first solenoid valve (13) is installed on the first rodless cavity oil return pipeline (17). An adjustment solenoid valve (14) is installed on the adjustment pipeline (18). The inlet of the adjustment solenoid valve (14) is connected to the outlet of the pump set (4) through the adjustment pipeline (18) and the first pipeline (15), and the outlet of the adjustment solenoid valve (14) is connected to the outlet of the first solenoid valve (13) through the adjustment pipeline (18) and the first rodless cavity oil return pipeline (17).

2. The hydraulic lifting system of an air bridge according to claim 1, wherein: A speed control valve (12) is provided between the first solenoid valve (13) and the second control valve group (7), and the speed control valve (12) is fixed on the first rodless cavity oil return pipeline (17).

3. The hydraulic lifting system of an air bridge according to claim 2, characterized in that: A second rodless cavity oil return pipeline (19) is provided on one side of the first rodless cavity oil return pipeline (17). The upper end of the second rodless cavity oil return pipeline (19) is connected to the rodless cavity (8) of the plunger cylinder (1) through the second control valve group (7), and the lower end is connected to the oil tank (5). A second solenoid valve (20) is installed on the second rodless cavity oil return pipeline (19).

4. A boarding bridge hydraulic lifting system according to claim 1 or 2 or 3, characterized in that: The second control valve group (7) includes a plunger control solenoid valve (21).

5. A boarding bridge hydraulic lifting system according to claim 1 or 2 or 3, characterized in that: The second control valve group (7) includes a plunger control solenoid valve (21) and a stop valve (22), and the stop valve (22) is arranged in parallel with the plunger control solenoid valve (21).

6. The hydraulic lifting system of an air bridge according to claim 1 or 2 or 3, characterized in that: A first filter (23) is provided between the inlet of the pump set (4) and the first solenoid valve group (6).

7. A hydraulic lifting system for an air bridge according to claim 1 or 2 or 3, characterized in that: A second filter (24) is provided between the outlet of the overflow valve (10) and the connection to the oil tank (5).

8. A boarding bridge hydraulic lifting system according to claim 1 or 2 or 3, characterized in that: A third filter (25) is provided between the inlet of the pump set (4) and the oil tank (5).

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