Vacuumizing oil injection system

Abstract

The invention belongs to the technical field of hydraulic shock absorbers, and particularly relates to a vacuum-pumping oil injection system which is characterized in that an extraction opening of an extraction pipe of a vacuum-pumping system and an oil injection opening of an oil injection pipe of an oil injection system are communicated with a cavity of a hydraulic shock absorber, so that the hydraulic shock absorber completes vacuum-pumping and oil injection operation at the same station, and the production efficiency is improved; the pumping pressurizing device and the gas storage tank are arranged on the vacuumizing system, so that the hydraulic shock absorber is vacuumized, and pumped gas is stored in the gas storage tank; the oil storage tank with the internal oil storage cavity and the compressed air cavity isolated from each other is arranged on the oil injection system, so that oil is pre-stored in the oil storage cavity and then injected into the hydraulic shock absorber through the oil injection pipe; the compressed air cavity is communicated with the air storage tank, so that oil in the oil storage cavity is rapidly pressed into the cavity of the hydraulic shock absorber under the dual action of the vacuum cavity of the hydraulic shock absorber and high-pressure air in the air storage tank, the oil injection operation is rapidly completed, air in the cavity of the hydraulic shock absorber is reduced, and the response speed of the hydraulic shock absorber is increased.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic shock absorbers, and particularly relates to a vacuum oil injection system. BACKGROUND

[0002] The hydraulic shock absorber is an important component of the vehicle suspension system, which absorbs and attenuates the vibration energy in the vehicle driving through the flow of liquid to generate damping force, thereby absorbing and slowing down the vibration and impact generated in the driving process of the vehicle, improving the driving comfort, control stability and driving safety of the vehicle. The hydraulic shock absorber on the vehicle is generally a passive shock absorber, but with the improvement of the stability requirement of the vehicle, the active hydraulic suspension is born. The hydraulic shock absorber on the active hydraulic suspension mainly realizes the active extension of the shock absorber by actively pumping out the oil in the rod cavity of the hydraulic shock absorber and filling it into the rodless cavity, or actively pumping out the oil in the rodless cavity of the hydraulic shock absorber and filling it into the rod cavity to realize the active compression of the shock absorber, thereby realizing the real-time active adjustment of the vehicle body height and improving the driving comfort and safety of the vehicle.

[0003] The hydraulic shock absorber of the vehicle needs to be uniformly injected with hydraulic oil before leaving the factory, and generally, the inner cavity of the hydraulic shock absorber does not need to be vacuumized before oil injection, which results in the existence of gas in the cavity of the hydraulic shock absorber. Since the active hydraulic suspension needs to control the vehicle chassis in real time, it requires the hydraulic shock absorber to respond quickly, and the gas in the cavity of the hydraulic shock absorber is compressible, while the oil is not compressible. When the oil in the hydraulic shock absorber flows during the active adjustment of the active hydraulic shock absorber, it will be affected by the compressibility of the internal gas, thereby causing the delay response of the hydraulic shock absorber. Therefore, the active hydraulic shock absorber needs to be vacuumized before leaving the factory, and then the oil filling operation can be carried out, so as to reduce the residual gas in the hydraulic shock absorber as much as possible and improve the response speed of the shock absorber.

[0004] Since the previous hydraulic shock absorber only needs to be injected with oil before leaving the factory and does not need to be vacuumized before the oil injection operation, there is no system that can both vacuumize and inject oil into the shock absorber. At present, the active hydraulic shock absorber needs to be transferred to the vacuumizing station for vacuumizing operation, and then transferred to the oil injection system for oil injection. The active inflation and oil injection operation need to be completed in two stations, which not only occupies many stations and has high equipment cost, but also has many shock absorber handling processes, causing time waste and reducing production efficiency. In addition, the existing oil injection system mainly uses the pump body to pump the oil from the oil tank to the hydraulic shock absorber, but since the oil is in contact with air in the oil supply device, gas is dissolved in the oil. The inner cavity of the hydraulic shock absorber is in a vacuum environment during oil injection, resulting in a pressure difference between the hydraulic shock absorber and the main oil pump. The efficiency of the pump body in pumping oil restricts the oil filling efficiency of the hydraulic shock absorber, causing the gas in the oil to be precipitated under the action of the pressure difference, and finally causing the gas in the oil filled into the shock absorber to be precipitated, affecting the response efficiency of the active hydraulic shock absorber. SUMMARY

[0005] The technical problem solved by the present application is to provide a vacuum oil injection system capable of completing the vacuum extraction and oil injection of a hydraulic shock absorber, rapidly completing the oil injection, reducing the gas in the finished hydraulic shock absorber, and improving the response speed and quality of the hydraulic shock absorber.

[0006] The technical solution adopted by the present application to solve the technical problem is a vacuum oil injection system comprising a vacuum extraction system and an oil injection system.

[0007] The vacuum extraction system comprises an air extraction pipe, an air extraction and pressurization device, and a gas storage tank; the air outlet of the air extraction pipe is in communication with the air inlet of the air extraction and pressurization device, and the air outlet of the air extraction and pressurization device is in communication with the air inlet of the gas storage tank; the air extraction pipe is provided with a first on-off valve for controlling the opening and closing of the air inlet thereof, a vacuum degree sensor for monitoring the vacuum degree inside the air extraction pipe, and a first one-way valve for controlling the passage of gas into the gas storage tank;

[0008] The oil injection system comprises an oil supply device, a metering oil extraction device, an oil storage tank, and an oil injection pipe; the oil storage tank is axially slidably connected with a piston, which separates the inner cavity of the oil storage tank into an oil storage cavity and a compressed gas cavity; the oil storage tank is provided with an air vent in communication with the compressed gas cavity and a second on-off valve for controlling the opening and closing of the air vent; the oil extraction port of the metering oil extraction device is in communication with the oil supply cavity of the oil supply device, the oil discharge port of the metering oil extraction device is in communication with the oil storage cavity of the oil storage tank, and the compressed gas cavity is in communication with the gas storage tank;

[0009] The oil discharge port of the metering oil extraction device is provided with a second one-way valve leading to the oil storage cavity; the oil injection pipe is provided with a third on-off valve for controlling the opening and closing of the oil passage thereof; further comprising a fourth on-off valve and an air extraction and oil injection pipe having an air extraction and oil injection port, the fourth on-off valve being used to control whether the compressed gas cavity and the gas storage tank are in communication, and the air inlet of the air extraction pipe and the oil discharge port of the oil injection pipe being respectively in communication with the air extraction and oil injection pipe.

[0010] Further, the vacuum degree sensor is arranged at one end of the air extraction port of the air extraction pipe.

[0011] Further, the air extraction and pressurization device is a dual-purpose air extraction and beating vacuum pump.

[0012] Further, the system further comprises a gas delivery pipe having an air inlet, a first air outlet, a second air outlet, and a fifth on-off valve for controlling the opening and closing of the second air outlet.

[0013] The air outlet of the dual-purpose air extraction and beating vacuum pump is in communication with the air inlet of the gas delivery pipe, and the air inlet of the gas storage tank is in communication with the first air outlet of the gas delivery pipe.

[0014] Further, the gas tank is provided with a gas pressure sensor for monitoring the internal gas pressure thereof.

[0015] The gas extraction pipe is further provided with a gas supplement port and a sixth switch valve for controlling the opening and closing of the gas supplement port, and the inner cavity of the gas extraction pipe is connected with the atmosphere through the gas supplement port.

[0016] Further, the gas extraction pipe is further provided with an overflow port, and the inner cavity of the gas extraction pipe is connected with the atmosphere through the overflow port; the overflow port is provided with a passive overflow valve for controlling the opening and closing of the overflow port.

[0017] Further, the metering oil extraction device is a metering pump.

[0018] Further, a three-way pipe is further included, which comprises an air inlet, an air outlet and a dual-purpose inlet and outlet, the air inlet of the three-way pipe is connected with the air outlet of the gas tank, the air outlet of the three-way pipe is connected with the atmosphere, and the dual-purpose inlet and outlet of the three-way pipe is connected with the air outlet of the oil tank.

[0019] The fourth switch valve is arranged on the air inlet of the three-way pipe, and the second switch valve is arranged on the air outlet of the three-way pipe and is used for controlling the opening and closing of the air outlet of the three-way pipe.

[0020] Further, the first switch valve, the second switch valve, the third switch valve, the fourth switch valve and the fifth switch valve are all solenoid valves.

[0021] Further, the gas extraction and oil injection pipe has two gas extraction and oil injection ports, one of which is used for being connected with the rod cavity of the hydraulic shock absorber, and the other of which is used for being connected with the rodless cavity of the hydraulic shock absorber.

[0022] Compared with the prior art, the beneficial effects of the present invention are: it provides a vacuuming and oiling system, in which the air extraction port of the vacuuming system and the oiling port of the oiling system are both connected to the cavity of the hydraulic shock absorber through the same air extraction and oiling pipe, so that the hydraulic shock absorber can complete the vacuuming and oiling operations at the same workstation, occupying fewer workstations and tooling, saving the handling process, improving production efficiency, and saving production costs; by setting a first switching valve and a third switching valve, the vacuuming system and the oiling system can be controlled independently without affecting each other. By installing a vacuum pumping and pressurizing device and an air storage tank on the vacuum system, the extracted gas is pressurized and stored in the air storage tank while the hydraulic shock absorber is being evacuated. By installing an oil storage tank with a piston slidingly connected to the inner cavity on the oil injection system, the oil storage chamber and the compressed air chamber are isolated from each other, but their volume changes are interconnected. The oil storage chamber is connected to the oil outlet of the metering pumping device and the oil injection pipe, so that the oil is pre-stored in the oil storage chamber and then injected into the hydraulic shock absorber through the oil injection pipe. The compressed air chamber is connected to the air storage tank, so that the oil in the oil storage chamber is quickly forced into the hydraulic shock absorber cavity under the dual action of the vacuum chamber of the hydraulic shock absorber and the high-pressure gas in the air storage tank. This quickly completes the oil injection operation, reduces the gas in the hydraulic shock absorber cavity, and avoids the gas dissolved in the oil from being released and re-injected into the hydraulic shock absorber, which would affect the working response efficiency of the finished shock absorber, thereby improving the response speed of the hydraulic shock absorber. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the system principle of one embodiment of the present invention;

[0024] Figure 2 yes Figure 1 Schematic diagram of the structure of the medium-sized oil storage tank;

[0025] Figure 3 This is a schematic diagram of the system principle of another embodiment of the present invention;

[0026] Reference numerals: 1-Ejection pipe; 11-Vacuum sensor; 17-Ejection and oil injection pipe; 2-Ejection and pressurization device; 23-Gas delivery pipe; 3-Gas storage tank; 31-First check valve; 32-Gas pressure sensor; 4-Oil supply device; 5-Metering oil extraction device; 51-Second check valve; 6-Oil storage tank; 65-T-connector; 61-Piston; 63-Oil storage chamber; 64-Compressed air chamber; 7-Oil injection pipe; 8-Hydraulic shock absorber; 81-Rod chamber; 82-Rodless chamber; 83-Shock absorber piston; 84-Piston rod; 91-First switching valve; 92-Second switching valve; 93-Third switching valve; 94-Fourth switching valve; 95-Fifth switching valve; 96-Sixth switching valve; 97-Passive relief valve. Detailed Implementation

[0027] The application will be further described in conjunction with the accompanying drawings and examples. The examples described below by referring to the accompanying drawings are exemplary and are only used to explain the application, and cannot be understood as a limitation of the application.

[0028] As shown in the accompanying drawings Figures 1-3 , a vacuum oil injection system, comprising a vacuum system and an oil injection system; the vacuum system comprises an air exhaust pipe 1, an air exhaust pressurizing device 2 and a gas storage tank 3; the air exhaust port of the air exhaust pipe 1 is communicated with the air inlet of the air exhaust pressurizing device 2, and the air exhaust port of the air exhaust pressurizing device 2 is communicated with the air inlet of the gas storage tank 3; the air exhaust pipe 1 is provided with a first on-off valve 91 for controlling the opening and closing of the air inlet thereof, a vacuum degree sensor 11 for monitoring the vacuum degree inside the air exhaust pipe 1 and a first one-way valve 31 for controlling the gas to flow into the gas storage tank 3; the oil injection system comprises an oil supply device 4, a metering oil pumping device 5, an oil storage tank 6 and an oil injection pipe 7; the oil storage tank 6 is axially slidably connected with a piston 61, and the piston 61 divides the inner cavity of the oil storage tank 6 into an oil storage cavity 63 and a compressed gas cavity 64; the oil storage tank 6 is provided with an air vent communicated with the compressed gas cavity 64 and a second on-off valve 92 for controlling the opening and closing of the air vent; the oil pumping port of the metering oil pumping device 5 is communicated with the oil supply cavity of the oil supply device 4, the oil discharge port of the metering oil pumping device 5 is communicated with the oil storage cavity 63 of the oil storage tank 6, and the compressed gas cavity 64 is communicated with the gas storage tank 3; the oil discharge port of the metering oil pumping device 5 is provided with a second one-way valve 51 leading to the oil storage cavity 63; the oil injection pipe 7 is provided with a third on-off valve 93 for controlling the opening and closing of the oil channel thereof; further comprising a fourth on-off valve 94 and an air exhaust oil injection pipe 17 having an air exhaust oil injection port, the fourth on-off valve 94 is used for controlling whether the compressed gas cavity 64 and the gas storage tank 3 are communicated or not, and the air inlet of the air exhaust pipe 1 and the oil discharge port of the oil injection pipe 7 are respectively communicated with the air exhaust oil injection pipe 17.

[0029] When the application is in a non-working state, the first on-off valve 91, the second on-off valve 92, the third on-off valve 93 and the fourth on-off valve 94 are all in a closed state, that is, the compressed gas cavity 64 of the gas storage tank 3 and the gas storage tank 6 are not communicated, the air inlet of the air exhaust pipe 1, the air vent on the oil storage tank 6 and the oil channel of the oil injection pipe 7 are all in a closed state.

[0030] When the hydraulic damper 8 is vacuumized by using the present application, the oil injection port of the oil injection and extraction pipe 17 is connected with the oil chamber of the hydraulic damper 8 to be filled with oil, the first switch valve 91 is opened to open the air inlet of the oil extraction pipe 1 and the air vent of the oil tank 6, the second switch valve 92 is opened to ensure that the compressed gas chamber 64 of the oil tank 6 is connected with the external atmosphere, the air path in the oil extraction pipe 1 is open, the oil extraction and pressurization device 2 and the metering oil extraction device 5 are started, the oil extraction and pressurization device 2 pressurizes the gas in the hydraulic damper 8 and extracts the gas to the gas storage tank 3 through the oil injection and extraction pipe 17 and the oil extraction pipe 1, and the metering oil extraction device 5 extracts the oil in the oil supply device 4 to the oil storage chamber 63 of the oil tank 6, and the oil entering the oil storage chamber 63 also pushes the piston 61 in the oil tank 6 to extrude the compressed gas chamber 64 to discharge the gas in the compressed gas chamber 64 to the atmosphere. When the vacuum degree sensor 11 detects that the vacuum degree in the oil extraction pipe 1 reaches a specified value, the oil extraction and pressurization device 2 and the first switch valve 91 are closed to stop oil extraction, and the vacuumization of the hydraulic damper 8 is completed. When the metering oil extraction device 5 detects that the oil volume delivered to the oil tank 6 reaches a specified volume, the metering oil extraction device 5 is closed. Subsequently, the second switch valve 92 is closed, the third switch valve 93 and the fourth switch valve 94 are opened, and the high-pressure gas in the compressed gas chamber 64 enters the compressed gas chamber 64. At this time, the cavity of the hydraulic damper 8 is in a vacuum environment, which causes the pressure difference between the cavity of the hydraulic damper 8 and the compressed gas chamber 64 to be large enough. The cavity of the hydraulic damper 8 extracts the oil in the oil tank 6 to the cavity of the hydraulic damper 8, and the high-pressure gas in the compressed gas chamber 64 also pushes the piston 63 in the oil tank 6 to slide and extrude the oil storage chamber 63, so that the oil in the oil storage chamber 63 is rapidly filled into the oil chamber of the hydraulic damper 8 through the oil injection pipe 7 and the oil injection and extraction pipe 17, the oil injection speed of the hydraulic damper 8 is improved, the gas in the oil is prevented from being precipitated during the oil injection process, the amount of gas precipitated in the cavity of the finished hydraulic damper 8 is reduced, and the response efficiency of the hydraulic damper 8 is improved. The amount of oil extracted by the metering oil extraction device 5 to the oil tank 6 at a time is the amount of oil required by the hydraulic damper 8 at a time.

[0031] The application is characterized in that the air outlet of the air outlet pipe 1 of the vacuumizing system and the oil inlet of the oil inlet pipe 7 of the oiling system are connected to the cavity of the hydraulic damper 8 through the same air-oiling pipe 17, so that the hydraulic damper 8 can complete the vacuumizing and oiling operations in the same station, occupies less station and tooling, saves the carrying process, improves the production efficiency and saves the production cost; the first switch valve 91 and the third switch valve 93 are arranged to separately control the vacuumizing system and the oiling system and not to affect each other; the air pressurizing device 2 and the gas storage tank 3 are arranged on the vacuumizing system to store the extracted gas in the gas storage tank 3 after pressurizing; the oil storage tank 6 with the piston 61 slidingly connected in the cavity is arranged on the oiling system to isolate the oil storage cavity 63 and the compressed gas cavity 64 and to associate the volume changes of the oil storage cavity 63 and the compressed gas cavity 64; the oil storage cavity 63 is connected to the oil outlet of the metering oil extraction device 5 and the oil inlet pipe 7 to store the oil in the oil storage cavity 63 and then inject the oil into the hydraulic damper 8 through the oil inlet pipe 7; and the compressed gas cavity 64 is connected to the gas storage tank 3 to press the oil in the oil storage cavity 63 into the cavity of the hydraulic damper 8 under the double actions of the vacuum cavity of the hydraulic damper 8 and the high-pressure gas of the gas storage tank 3, rapidly complete the oiling operation, reduce the gas in the cavity of the hydraulic damper, avoid the dissolved gas in the oil from being injected into the hydraulic damper 8 again to affect the working response efficiency of the finished product of the damper, and then improve the response speed of the hydraulic damper 8.

[0032] The air outlet pipe 1 is mainly used for connecting the vacuumizing system and the inner cavity of the hydraulic damper 8, the first switch valve 91 is used for controlling the connection of the vacuumizing system and the inner cavity of the hydraulic damper 8, and the first switch valve 91 can be arranged at any position in the axial direction of the air outlet pipe 1. In the vacuumizing operation process, the vacuum degree sensor 11 indirectly realizes the monitoring of the vacuum degree of the inner cavity of the hydraulic damper 8 by monitoring the vacuum degree of the air outlet pipe 1, and the vacuum degree sensor 11 can be arranged at any position in the axial direction of the air outlet pipe 1. Preferably, the vacuum degree sensor 11 is arranged at one end of the air outlet of the air outlet pipe 1. The air outlet of the air outlet pipe 1 is closer to the inner cavity of the hydraulic damper 8, so that the vacuum degree of the air outlet of the air outlet pipe 1 is also closer to the vacuum degree of the inner cavity of the hydraulic damper 8, the vacuum degree of the inner cavity of the hydraulic damper 8 measured by the vacuum degree sensor 11 is more accurate, and then the vacuum degree of the inner cavity of the hydraulic damper 8 is ensured and the quality of the vacuumizing operation is improved.

[0033] The air extraction and pressurization device 2 is used to extract the gas in the hydraulic damper 8 and pressurize the extracted gas before the pressurized gas is injected into the gas storage tank 3. The air extraction and pressurization device 2 can be an air extraction pump 21 and a pressurization pump 22 which are not connected to each other. The air extraction pump 21 is connected to the cavity of the hydraulic damper 8 through an air inlet of the air extraction pump 21, and the air extraction pump 21 is connected to the atmosphere through an air outlet of the air extraction pump 21. The pressurization pump 22 is connected to the atmosphere through an air inlet of the pressurization pump 22, and the pressurization pump 22 is connected to the gas storage tank 3 through an air outlet of the pressurization pump 22. The air extraction pump is used to extract the gas in the cavity of the hydraulic damper 8 and discharge the extracted gas to the atmosphere. The pressurization pump is used to pressurize the gas in the atmosphere and inject the pressurized gas into the gas storage tank 3. Preferably, the air extraction and pressurization device 2 is a dual-purpose air extraction and pressurization pump, which has a simple structure and is easy to assemble and control.

[0034] As a further preferred embodiment, a gas delivery pipe 23 is further provided. The gas delivery pipe 23 has an air inlet, a first air outlet, a second air outlet, and a fifth switch valve 95 used to control the opening and closing of the second air outlet. The air outlet of the dual-purpose air extraction and pressurization pump is connected to the air inlet of the gas delivery pipe 23. The air inlet of the gas storage tank 3 is connected to the first air outlet of the gas delivery pipe 23. When the gas pressure in the gas storage tank 3 reaches a specified value, the fifth switch valve 95 is opened to open the second air outlet to discharge the excess gas. When the air extraction system is not used for a long time, the first switch valve 91 and the sixth switch valve 96 are closed, the fifth switch valve 95 is controlled to open the second air outlet, the air inlet of the vacuum pump outside the system is connected to the second air outlet of the gas delivery pipe 23, and the dual-purpose air extraction and pressurization pump is vacuumized to be stored, so that dust does not enter the interior of the dual-purpose air extraction and pressurization pump and the dual-purpose air extraction and pressurization pump is easy to store.

[0035] The gas storage tank 3 is used to store high-pressure gas. A first one-way valve 31 is arranged on the gas storage tank 3 to prevent the high-pressure gas in the gas storage tank 3 from flowing back from the air inlet of the gas storage tank 3. The first one-way valve 31 is generally a pressure valve. The gas pressure provided by the gas storage tank 3 is sufficient to achieve the effect of rapidly pushing the piston 61 in the oil storage tank 6. Preferably, a gas pressure sensor 32 is arranged on the gas storage tank 3 to monitor the gas pressure in the gas storage tank 3. A gas supplement inlet and a sixth switch valve 96 used to control the opening and closing of the gas supplement inlet are further arranged on the air extraction pipe 1. The inner cavity of the air extraction pipe 1 is connected to the atmosphere through the gas supplement inlet. The first switch valve 91 is arranged on the air extraction pipe 1. The sixth switch valve 96 is in a closed state. When the air extraction of the hydraulic damper 8 is completed and it is monitored that the pressure in the gas storage tank 3 is insufficient, the sixth switch valve 96 is opened to connect the inner cavity of the air extraction pipe 1 to the atmosphere. The air extraction and pressurization device 2 is started to extract the gas outside the air extraction pipe 1 through the gas supplement inlet and pressurize the extracted gas before the pressurized gas is injected into the gas storage tank 3. When the gas pressure monitored by the gas pressure sensor 32 reaches a specified value, the sixth switch valve 96 is closed.

[0036] As a further preferred, the gas delivery pipe 23 is further provided with an overflow port, the inner cavity of the gas delivery pipe 23 is communicated with the external atmosphere through the overflow port; the overflow port is provided with a passive overflow valve 97 for controlling the opening and closing of the overflow port. When the gas pressure value of the pipeline between the air pumping and pressurizing device 2 and the gas storage tank 3 is greater than the set value of the passive overflow valve 97, the passive overflow valve 97 opens the overflow port to make the high-pressure gas in the pipeline to be discharged to the atmosphere through the overflow port, so as to realize timely pressure relief, avoid damage to the dual-purpose vacuum pump, protect the entire vacuum pumping system, and improve the safety and reliability of the vacuum pumping system.

[0037] The oil supply device 4 is an oil source, which can be an oil storage pipeline or an oil tank. In production sites, an oil tank is generally selected, and the oil extraction port of the metering oil extraction device 5 is required to be immersed below the liquid level in the oil tank. The metering oil extraction device 5 is used to extract a certain amount of oil according to the required oil injection amount of the hydraulic shock absorber 8, which can be a combination structure of a hydraulic pump and a flowmeter arranged on the oil inlet or oil outlet of the hydraulic pump. Preferably, the metering oil extraction device 5 is a metering pump, which has a simple structure and is easy to connect and assemble.

[0038] The piston 61 on the oil storage tank 6 cooperates to form an oil storage cavity 63 and a compressed gas cavity 64, and the movement of the piston 61 can change the volumes of the oil storage cavity 63 and the compressed gas cavity 64 on both sides of the piston 61. The oil injection pipe 7 is used to communicate the oil storage cavity 63 and the hydraulic shock absorber 8. The oil storage cavity 63 is used to temporarily store oil, and the compressed gas cavity 64 is used to smoothly enter the oil storage cavity 63 when it is communicated with the external atmosphere. When the compressed gas cavity 64 is communicated with the gas storage tank 3, the high-pressure gas in the gas storage tank 3 enters the compressed gas cavity 64 to push the piston 61 to extrude the oil storage cavity 63, so that the oil is rapidly injected into the hydraulic shock absorber 8 through the oil injection pipe 7 under the dual action of the high-pressure gas and the negative pressure of the hydraulic shock absorber 8. The capacity of the oil storage cavity 63 is generally greater than the volume of the required oil amount of the hydraulic shock absorber at a time, so as to meet the oil injection amount requirements of different hydraulic shock absorbers. Specifically, it further includes a three-way pipe 65, which includes an air inlet, an air outlet, and a dual-purpose inlet and outlet. The air inlet of the three-way pipe 65 is communicated with the air outlet of the gas storage tank 3, the air outlet of the three-way pipe 65 is communicated with the atmosphere, and the dual-purpose inlet and outlet of the three-way pipe 65 is communicated with the air outlet of the oil storage tank 6. The fourth switch valve 94 is arranged on the air inlet of the three-way pipe 65, and the second switch valve 92 is arranged on the air outlet of the three-way pipe 65 and is used to control the opening and closing of the air outlet of the three-way pipe 65. When the metering oil extraction device 5 extracts oil into the oil storage cavity 63, the second switch valve 92 is opened, and the fourth switch valve 94 is closed. When the fourth switch valve 94 and the third switch valve 93 are both opened to inject oil into the hydraulic shock absorber 8, the second switch valve 92 is closed. When the equipment is not used for a long time, the fourth switch valve 94 and the second switch valve 92 can be opened at the same time to communicate the air outlet of the gas storage tank 3 with the atmosphere to release the gas in the gas storage tank 3.

[0039] The first switch valve 91, the second switch valve 92, the third switch valve 93, the fourth switch valve 94 and the fifth switch valve 95 in the application can adopt a manually controlled switch valve, or can adopt a pneumatic valve or an electric valve. Preferably, the first switch valve 91, the second switch valve 92, the third switch valve 93, the fourth switch valve 94 and the fifth switch valve 95 are all solenoid valves, which are convenient for electrically controlled connection with a general controller, and then the automatic opening and closing of the first switch valve 91, the second switch valve 92, the third switch valve 93, the fourth switch valve 94 and the fifth switch valve 95 can be controlled through the general controller such as a PLC, an industrial computer or a single-chip microcomputer, so as to improve the operation efficiency.

[0040] The air extraction and oil injection pipe 17 of the application is used to realize the communication switching of the vacuum extraction system and the oil injection system with the inner cavity of the hydraulic damper 8. Specifically, the air extraction and oil injection pipe 17 has two air extraction and oil injection ports, one of which is used to communicate with the rod cavity 81 of the hydraulic damper 8, and the other of which is used to communicate with the rodless cavity 82 of the hydraulic damper 8. During the vacuum extraction and oil injection operation, one air extraction and oil injection port communicates with the rod cavity 81 of the hydraulic damper 8, and the other air extraction and oil injection port communicates with the rodless cavity 82 of the hydraulic damper 8, so as to realize the simultaneous vacuum extraction and oil injection of the rod cavity 81 and the rodless cavity 82 of the hydraulic damper 8, and improve the operation efficiency. The hydraulic damper 8 generally comprises an inner cylinder and a damper piston 83 slidably connected in the inner cylinder, one end of the damper piston 83 is connected with a piston rod 84 which is synchronous and follows the damper piston 83 and extends out of the inner cylinder, and the damper piston 83 divides the inner cavity of the inner cylinder into two chambers, one of which is the rod cavity 81 where the piston rod 84 is located, and the other of which is the rodless cavity 82.

[0041] The embodiments of the specific embodiment are the preferred embodiments of the application, and do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A vacuum oil injection system, characterized in that: Includes a vacuum system and an oil injection system; The vacuum system includes a vacuum pipe (1), a vacuum pressurizing device (2), and a gas storage tank (3); the exhaust port of the vacuum pipe (1) is connected to the inlet of the vacuum pressurizing device (2), and the exhaust port of the vacuum pressurizing device (2) is connected to the inlet of the gas storage tank (3); the vacuum pipe (1) is provided with a first switching valve (91) for controlling the opening and closing of its inlet, a vacuum sensor (11) for monitoring its internal vacuum level, and a first one-way valve (31) for controlling the gas flow into the gas storage tank (3). The oil injection system includes an oil supply device (4), a metering oil extraction device (5), an oil storage tank (6), and an oil injection pipe (7); a piston (61) is axially slidably connected inside the oil storage tank (6), and the piston (61) divides the inner cavity of the oil storage tank (6) into an oil storage chamber (63) and a compressed air chamber (64); the oil storage tank (6) is provided with a vent that communicates with the compressed air chamber (64) and a second switch valve (92) for controlling the opening and closing of the vent; the oil extraction port of the metering oil extraction device (5) is connected to the oil supply chamber of the oil supply device (4), the oil discharge port of the metering oil extraction device (5) is connected to the oil storage chamber (63) of the oil storage tank (6), and the compressed air chamber (64) is connected to the air storage tank (3); The metering oil extraction device (5) is provided with a second one-way valve (51) leading to the oil storage chamber (63) at its oil outlet; the oil injection pipe (7) is provided with a third switch valve (93) for controlling the opening and closing of its oil passage; it also includes a fourth switch valve (94) and an air extraction and oil injection pipe (17) with an air extraction and oil injection port. The fourth switch valve (94) is used to control whether the compressed air chamber (64) and the air storage tank (3) are connected. The air inlet of the air extraction pipe (1) and the oil outlet of the oil injection pipe (7) are respectively connected to the air extraction and oil injection pipe (17).

2. The vacuum oil injection system according to claim 1, characterized in that, The vacuum sensor (11) is located at one end of the suction port of the suction pipe (1).

3. The vacuum oil injection system according to claim 2, characterized in that, The vacuum pumping and pressurizing device (2) is a vacuum pump that can be used for both pumping and pressing.

4. The vacuum oil injection system according to claim 3, characterized in that, It also includes a gas supply pipe (23), which has an air inlet, a first exhaust port, a second exhaust port, and a fifth switch valve (95) for controlling the opening and closing of the second exhaust port. The outlet of the vacuum pump is connected to the inlet of the gas supply pipe (23), and the inlet of the gas storage tank (3) is connected to the first exhaust port of the gas supply pipe (23).

5. The vacuum oil injection system according to claim 4, characterized in that, The gas storage tank (3) is equipped with a gas pressure sensor (32) for monitoring its internal gas pressure. The air extraction pipe (1) is also provided with an air supply port and a sixth switch valve (96) for controlling the opening and closing of the air supply port. The inner cavity of the air extraction pipe (1) is connected to the atmosphere through the air supply port. The first switch valve (91) is provided on the air extraction port.

6. The vacuum oil injection system according to claim 4, characterized in that, The gas pipeline (23) is also provided with an overflow port, and the inner cavity of the gas pipeline (23) is connected to the outside atmosphere through the overflow port; the overflow port is provided with a passive overflow valve (97) for controlling the opening and closing of the overflow port.

7. The vacuum oil injection system according to claim 5, characterized in that, The metering pumping device (5) is a metering pump.

8. The vacuum oil injection system according to claim 5, characterized in that, It also includes a three-way pipe (65), which includes an air inlet, an exhaust outlet and a dual-purpose inlet and exhaust outlet. The air inlet of the three-way pipe (65) is connected to the exhaust outlet of the air storage tank (3), the exhaust outlet of the three-way pipe (65) is connected to the atmosphere, and the dual-purpose inlet and exhaust outlet of the three-way pipe (65) is connected to the exhaust outlet of the oil storage tank (6). The fourth switching valve (94) is located on the air inlet of the three-way pipe (65), and the second switching valve (92) is located on the exhaust port of the three-way pipe (65) and is used to control the opening and closing of the exhaust port of the three-way pipe (65).

9. The vacuum oil injection system according to any one of claims 1-8, characterized in that, The first switching valve (91), the second switching valve (92), the third switching valve (93), the fourth switching valve (94) and the fifth switching valve (95) are all solenoid valves.

10. The vacuum oil injection system according to claim 9, characterized in that, The air extraction and oil injection pipe (17) has two air extraction and oil injection ports. One of the air extraction and oil injection ports is used to connect with the rod chamber (81) of the hydraulic damper (8), and the other air extraction and oil injection port is used to connect with the rodless chamber (82) of the hydraulic damper (8).

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