Hydraulic lifting system of boarding bridge

Abstract

The invention 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 motor, a pump set, an oil tank, a first electromagnetic valve set and a second control valve set, a cavity is formed in the plunger type cylinder, a plunger is arranged in the cavity, and the cavity is divided into a rodless cavity and a rod cavity by the plunger. The pump set is driven by a 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] This invention relates to the field of boarding bridge lifting technology, specifically to a hydraulic lifting system for boarding bridges. Background Technology

[0002] Existing boarding bridges generally use piston cylinders for lifting, which poses a safety hazard of internal leakage and has a high failure rate due to the large number of hydraulic components and pipelines used. A search revealed Chinese patent CN102996565A, which discloses a piston cylinder structure for lifting boarding bridges. This piston cylinder structure is characterized by: a piston cylinder with a cavity and a guide sleeve; a piston disposed within the cavity and slidingly sealingly engaging with the inner wall of the guide sleeve; a support ring on the inner wall of the guide sleeve, which also slidingly seals with the piston; and a lower end of the piston... A guide ring is provided, which slides in contact with the inner wall of the plunger cylinder. The plunger cylinder supports and guides the plunger at its upper and lower points through a support ring and a guide ring. An integrated oil circuit is located inside the bottom of the plunger cylinder. A solenoid valve is located on the integrated oil circuit and is connected to the oil circuit to control the plunger's upward and rapid downward movement. A hydraulically controlled check valve is located on the integrated oil circuit and is connected to the oil circuit and is arranged in parallel with the solenoid valve to control the plunger's downward movement. The guide sleeve contains several first sealing rings and has an exhaust device. The shortcomings of the aforementioned patent are as follows: First, the patent uses a hydraulically controlled check valve. If the hydraulically controlled check valve is blocked by impurities or malfunctions, hydraulic oil will enter the plunger cylinder through the hydraulically controlled check valve, causing the plunger cylinder to fall automatically, resulting in a sudden descent of the boarding bridge and a safety accident. Second, during use, the hydraulic system oil pressure is prone to becoming too high, damaging the hydraulic system. Third, the patent relies solely on a solenoid valve, resulting in a boarding bridge descent speed that is too fast, which can easily lead to safety accidents. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a hydraulic lifting system for boarding bridges that is simple in structure, easy to adjust, equipped with an overflow valve to protect the hydraulic system, and provides smooth lifting and high safety.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A hydraulic lifting system for a boarding bridge includes a piston cylinder, a cavity within the piston cylinder, a guide sleeve on the piston cylinder, and a piston within the cavity. The piston slides and seals against the inner wall of the guide sleeve. The system further includes a motor, a pump assembly, an oil tank, a first solenoid valve assembly, and a second control valve assembly. The piston divides the cavity into a rodless chamber and a rod chamber. The pump unit is driven by a motor. The first solenoid valve group includes a relief valve, a check valve, a speed control valve, a first solenoid valve, and a regulating solenoid valve. The oil inlet of the relief valve is connected to the oil outlet of the pump unit via a pipeline, and the oil outlet of the relief valve is connected to the oil tank via a pipeline. This facilitates pressure relief by the relief valve when the output oil pressure of the pump unit exceeds the set pressure of the relief valve, preventing destructive damage to the entire hydraulic system. The oil inlet of the pump unit is connected to the oil tank. The input port of the check valve is connected to the oil outlet of the pump unit via a first pipeline, and the output port of the check valve is connected to the second control valve group via a second pipeline. The second control valve group is installed on the connecting pipeline of the rodless chamber of the piston cylinder. A first rodless chamber return oil line is provided on one side of the first pipeline. A regulating pipeline is provided between the first pipeline and the first rodless chamber return oil line. The upper end of the first rodless chamber return oil line is connected to the rodless chamber of the piston cylinder via the second control valve group, and the lower end is connected to the oil tank. A first solenoid valve is installed on the pipeline. A speed regulating valve is provided between the first solenoid valve and the second control valve group. The speed regulating valve is fixed on the first rodless chamber return oil pipeline. A regulating solenoid valve is installed on the regulating pipeline. The oil inlet of the regulating solenoid valve is connected to the oil outlet of the pump group through the regulating pipeline and the first connecting pipeline. The oil outlet of the regulating solenoid valve is connected to the oil outlet of the first solenoid valve through the regulating pipeline and the first rodless chamber return oil pipeline. This allows the regulating solenoid valve to close when it receives the piston cylinder's upward movement command. The pump group outputs oil through the check valve, the second pipeline, and the second control valve group to reach the rodless chamber of the piston cylinder, driving the piston to move upward. When the second control valve group and the first solenoid valve receive the piston cylinder's downward movement command, the hydraulic oil in the piston cylinder's rodless chamber returns to the oil tank through the second control valve group, the first rodless chamber return oil pipeline, and the first solenoid valve. The speed regulating valve ensures a constant inlet and outlet pressure difference and a constant flow rate, resulting in a smooth descent of the boarding bridge.

[0005] The present invention provides a second rodless chamber return oil line on one side of the first rodless chamber return oil line. The upper end of the second rodless chamber return oil line is connected to the rodless chamber of the plunger cylinder via a second control valve group, and the lower end is connected to the oil tank. A second solenoid valve is installed on the second rodless chamber return oil line so that when the plunger needs to descend rapidly, when the second control valve group and the second solenoid valve receive the action command, 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 return oil line, and the second solenoid valve, thereby realizing the rapid descent of the boarding bridge.

[0006] The second control valve assembly of the present invention includes a plunger-controlled solenoid valve to control the flow direction of hydraulic oil.

[0007] The second control valve group of the present invention includes a plunger control solenoid valve and a shut-off valve. The shut-off valve and the plunger control solenoid valve are connected in parallel so that when the system power source or electrical control fails, the shut-off valve and the first solenoid valve can be manually controlled to allow the hydraulic oil in the plunger cylinder to slowly flow back to the oil tank under the gravity of the boarding bridge, thereby completing the emergency descent of the boarding bridge.

[0008] The pump unit of the present invention is provided with a first filter between the oil inlet and the first control valve group to filter the hydraulic oil, thereby improving the service life of the hydraulic oil and reducing equipment wear.

[0009] The present invention provides a second filter between the oil outlet of the overflow valve and the oil tank to filter the hydraulic oil, thereby improving the service life of the hydraulic oil and reducing equipment wear.

[0010] The pump unit of the present invention is provided with a third filter between the oil inlet and the oil tank to filter the hydraulic oil, thereby improving the service life of the hydraulic oil and reducing equipment wear.

[0011] Due to the above-mentioned structure, the present invention has the advantages of simple structure, high safety, stable performance, controllable system hydraulic pressure, and smooth lifting of the boarding bridge. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention.

[0013] Figure 2 This is a cross-sectional view of the plunger cylinder of the present invention.

[0014] Figure 3 This is the hydraulic flow diagram of the present invention.

[0015] Reference numerals: 1. Plunger cylinder; 2. Plunger; 3. Motor; 4. Pump assembly; 5. Oil tank; 6. First solenoid valve assembly; 7. Second control valve assembly; 8. Rodless chamber; 9. Rod chamber; 10. Relief valve; 11. Check valve; 12. Speed ​​control valve; 13. First solenoid valve; 14. Regulating solenoid valve; 15. First pipeline; 16. Second pipeline; 17. First rodless chamber return pipeline; 18. Regulating pipeline; 19. Second rodless chamber return pipeline; 20. Second solenoid valve; 21. Plunger control solenoid valve; 22. Shut-off valve; 23. First filter; 24. Second filter; 25. Third filter. Detailed Implementation

[0016] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0017] A hydraulic lifting system for a boarding bridge includes a piston cylinder 1, which has a cavity and a guide sleeve. A piston 2 is located within the cavity, and the piston 2 slides and seals against the inner wall of the guide sleeve. The system further includes a motor 3, a pump assembly 4, an oil tank 5, a first solenoid valve assembly 6, and a second control valve assembly 7. The piston 2 divides the cavity into a rodless chamber 8 and a rod chamber 9. The pump assembly 4 is driven by the motor 3. The first solenoid valve assembly 6 includes an overflow valve 10, a check valve 11, a speed control valve 12, a first solenoid valve 13, and a regulating solenoid valve 14. The oil inlet of the overflow valve 10 is connected to the pump via a pipeline. The outlet of group 4 is connected to the oil tank 5 via a pipeline. This allows the overflow valve 10 to release pressure when the output oil pressure of the pump group exceeds the set pressure of the overflow valve, preventing destructive damage to the entire hydraulic system. The inlet of the pump group 4 is connected to the oil tank 5. The inlet of the check valve 11 is connected to the outlet of the pump group 4 via the first pipeline 15. The outlet of the check valve 11 is connected to the second control valve group 7 via the second pipeline 16. The second control valve group 7 is installed on the connecting pipeline of the rodless chamber 8 of the piston cylinder 1. A first rodless chamber return oil pipeline 17 is provided on one side of the first pipeline 15. The first pipeline 15 and... A regulating pipe 18 is provided between the first rodless chamber return oil line 17 and the first rodless chamber return oil line 17. The upper end of the first rodless chamber return oil line 17 is connected to the rodless chamber 8 of the plunger cylinder 1 via 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 chamber return oil line 17. A speed regulating valve 12 is provided between the first solenoid valve 13 and the second control valve group 7. The speed regulating valve 12 is fixed on the first rodless chamber return oil line 17. A regulating solenoid valve 14 is installed on the regulating pipe 18. The oil inlet of the regulating solenoid valve 14 is connected to the oil outlet of the pump group 4 via the regulating pipe 18 and the first connecting pipe 15. The oil outlet of 14 is connected to the oil outlet of the first solenoid valve 13 via the regulating pipeline 18, the first rodless chamber return oil pipeline 17, so that when the regulating solenoid valve receives the command for the piston cylinder to rise, the regulating solenoid valve closes, and the pump output oil reaches the rodless chamber of the piston cylinder via the check valve, the second pipeline, and the second control valve group, driving the piston to move upward. When the second control valve group and the first solenoid valve receive the command for the piston cylinder to descend, the hydraulic oil in the rodless chamber of the piston cylinder returns to the oil tank via the second control valve group, the first rodless chamber return oil pipeline, and the first solenoid valve. The speed regulating valve can keep the inlet and outlet pressure difference constant and the flow rate constant, so that the boarding bridge descends smoothly.

[0018] The present invention provides a second rodless chamber return oil line 19 on one side of the first rodless chamber return oil line 17. The upper end of the second rodless chamber return oil line 19 is connected to the rodless chamber 8 of the plunger cylinder 1 via 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 chamber return oil line 19 so that when the plunger needs to descend rapidly, when the second control valve group and the second solenoid valve receive the action command, 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 return oil line, and the second solenoid valve, thereby realizing the rapid descent of the boarding bridge.

[0019] The second control valve group 7 of the present invention includes a plunger control solenoid valve 21 to control the flow direction of hydraulic oil.

[0020] The second control valve group 7 of the present invention includes a plunger control solenoid valve 21 and a shut-off valve 22. The shut-off valve 22 is connected in parallel with the plunger control solenoid valve 21 so that when the system power source or electrical control fails, the shut-off valve and the first solenoid valve can be manually controlled to allow the hydraulic oil in the plunger cylinder to slowly flow back to the oil tank under the gravity of the boarding bridge, thereby completing the emergency descent of the boarding bridge.

[0021] The pump group 4 of the present invention is provided with a first filter 23 between the oil inlet and the first control valve group 6, so as to filter the hydraulic oil through the filter, improve the service life of the hydraulic oil and reduce the wear and tear of the equipment.

[0022] The overflow valve 10 of the present invention is provided with a second filter 24 between the oil outlet and the oil tank 5 to filter the hydraulic oil, thereby improving the service life of the hydraulic oil and reducing equipment wear.

[0023] The pump unit 4 of the present invention is provided with a third filter 25 between the oil inlet and the oil tank 5 to filter the hydraulic oil, thereby improving the service life of the hydraulic oil and reducing equipment wear.

[0024] As attached Figure 1 Existing boarding bridge technology includes a crossbeam, inner and outer sleeves on both sides of the crossbeam, the inner sleeve being fixed to the crossbeam, the outer sleeve being fixed to the boarding bridge passage, and the outer sleeve being slidably connected to the inner sleeve. This part is the same as existing technology and will not be described in detail. In this invention, the motor 3, pump group 4, oil tank 5, first solenoid valve group 6, and second control valve group 7 are all installed on the crossbeam of the boarding bridge. Two plunger cylinders 1 are installed on both sides of the upper end of the crossbeam. A plunger rod is inserted into 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 extends out of the plunger 2 and connects to the outer sleeve of the boarding bridge. The plunger 2 rises and falls, which drives the plunger rod to rise and fall. The plunger rod drives the boarding bridge passage to rise and fall through the outer sleeve, thereby realizing the raising and lowering of the boarding bridge. Motor 3, pump assembly 4, oil tank 5, first solenoid valve assembly 6, and second control valve assembly 7 can all be connected to the boarding bridge's control system, such as a PLC control system. As attached Figure 2 In this invention, 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 assembly 7. As attached Figure 3 The overflow valve 10, check valve 11, speed control valve 12, first solenoid valve 13, regulating solenoid valve 14, and 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 group 4, the oil return port of the first solenoid valve group 7 is connected to the oil tank 5 via the second filter 24, and the oil outlet of the first solenoid valve group 7 is connected to the rodless chamber 8 of the plunger cylinder 1 via the second control valve group 7. Filters can be installed between the first solenoid valve group 7 and the pump group 4, and between the pump group 4 and the oil tank 5, to facilitate the filtration of hydraulic oil. 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 via the regulating pipeline 18 and the first rodless chamber return oil pipeline 17. The oil inlet of the first solenoid valve 13 is connected to the oil outlet of the speed control valve 12, and the oil inlet of the speed control valve 12 is connected to the second control valve group 7 via a pipeline. The oil outlet of the first solenoid valve 13 is connected to the oil tank 5 via a filter. The oil inlet of the second solenoid valve 13 is connected to the rodless chamber 8 of the plunger cylinder 1 via the second control valve group 7, and the oil outlet of the second solenoid valve 13 is connected to the oil tank 5 via a filter. In use, the pump set 4 is driven by a motor to pump hydraulic oil from the oil tank 5 through the filter to the oil inlet of the first solenoid valve set 6. An overflow valve 10 is installed at the oil 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 releases pressure, so that the system pressure is kept at or below the set value, preventing destructive damage to the entire hydraulic system. When the regulating solenoid valve 14 receives the command to raise the boarding bridge, the regulating solenoid valve 14 closes, and the oil output from the pump group 4 reaches the rodless chamber 8 of the plunger cylinder 1 through the check valve 11, the second pipeline 16, and the plunger control solenoid valve 21, driving the plunger 2 to move upward. When the plunger control solenoid valve 21 and the first solenoid valve 13 receive the boarding bridge descent command, the hydraulic oil in the rodless chamber 8 of the plunger cylinder 1 returns to the oil tank 5 through the plunger control solenoid valve 21, the first rodless chamber return oil line 17, and the first solenoid valve 13. The speed control valve 12 can keep the inlet and outlet pressure difference constant and the flow rate constant, so that the boarding bridge descent action is smooth. When the safety boots placed under the aircraft door at the boarding bridge access point are touched, the boarding bridge needs to descend rapidly to prevent damage to the aircraft door. At this time, when the plunger control solenoid valve 21 and the second solenoid valve 20 receive the action command, the hydraulic oil in the rodless chamber 8 of the plunger cylinder 1 returns to the oil tank 5 through the plunger control solenoid valve 21, the return oil line 19 of the second rodless chamber, and the second solenoid valve 20, so as to realize the rapid descent of the boarding bridge. When the system power source or electrical control fails and an emergency descent is required, the hydraulic oil in the piston cylinder 1 can be slowly returned to the oil tank 5 under the gravity of the boarding bridge by manually controlling the shut-off valve 22 and the first solenoid valve 13, thus completing the emergency descent of the boarding bridge. Compared with existing technologies, this invention has several advantages: First, it uses a one-way valve 11 and a regulating solenoid valve 14 to raise the boarding bridge, preventing the piston cylinder from automatically falling, thus ensuring good safety and stable performance. Second, it includes an overflow valve 10 to prevent excessive hydraulic oil pressure from the pump unit, which could damage the hydraulic system. Third, it features a first rodless chamber return oil line 17, on which a speed regulating valve 12 and a first solenoid valve 13 are installed. The pressure difference is adjusted through the inlet and outlet of the speed regulating valve 12 to maintain a constant pressure difference and flow rate. This invention ensures smooth lifting and lowering of the boarding bridge. Furthermore, in the event of an emergency requiring rapid descent, the hydraulic oil in the rodless chamber 8 of the plunger cylinder 1 returns to the oil tank 5 via the plunger control solenoid valve 21, the second rodless chamber return line 19, and the second solenoid valve 20, enabling rapid descent. Fourthly, this invention not only includes a first control valve group 6 but also a second control valve group 7. After the boarding bridge rises, the plunger control solenoid valve 21 ensures that the hydraulic oil in the rodless chamber does not flow back, ensuring the boarding bridge remains in a stable, raised state without swaying.

[0025] Due to the above-mentioned structure, the present invention has the advantages of simple structure, high safety, stable performance, controllable system hydraulic pressure, and smooth lifting of the boarding bridge.

Claims

1. A hydraulic lifting system for a boarding bridge, comprising a piston cylinder (1), wherein the piston cylinder (1) has a cavity and a piston (2) is disposed within the cavity, characterized in that: The hydraulic lifting system of the boarding bridge also includes a motor (3), a pump group (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 chamber (8) and a rod chamber (9). The pump group (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 a regulating solenoid valve (14). The oil inlet of the overflow valve (10) is connected to the oil outlet of the pump group (4) via a pipeline. The oil outlet of the overflow valve (10) is connected to the oil tank (5) via a pipeline. The oil inlet of the pump group (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 group (4) via a first pipeline (15). The output port of the check valve (11) is connected to the second control valve group (7) via a second pipeline (16). The second control valve group (7) On the connecting pipeline installed in the rodless chamber (8) of the plunger cylinder (1), a first rodless chamber return oil pipeline (17) is provided on one side of the first pipeline (15). An adjusting pipeline (18) is provided between the first pipeline (15) and the first rodless chamber return oil pipeline (17). The upper end of the first rodless chamber return oil pipeline (17) is connected to the rodless chamber (8) of the plunger cylinder (1) via 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 chamber return oil pipeline (17), and an adjusting solenoid valve (14) is installed on the adjusting pipeline (18). The oil inlet of the adjusting solenoid valve (14) is connected to the oil outlet of the pump group (4) via the adjusting pipeline (18) and the first connecting pipeline 15. The oil outlet of the adjusting solenoid valve (14) is connected to the oil outlet of the first solenoid valve (13) via the adjusting pipeline (18) and the first rodless chamber return oil pipeline (17).

2. The hydraulic lifting system for a boarding bridge according to claim 1, characterized in that: A speed regulating valve (12) is provided between the first solenoid valve (13) and the second control valve group (7), and the speed regulating valve (12) is fixed on the first rodless chamber return oil pipeline (17).

3. The hydraulic lifting system for a boarding bridge according to claim 2, characterized in that: A second rodless chamber return oil line (19) is provided on one side of the first rodless chamber return oil line (17). The upper end of the second rodless chamber return oil line (19) is connected to the rodless chamber (8) of the plunger cylinder (1) via 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 chamber return oil line (19).

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

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

6. A hydraulic lifting system for a boarding bridge according to claim 1, 2, or 3, characterized in that: A first filter (23) is provided between the oil inlet of the pump group (4) and the first control valve group (6).

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

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

Images