CN111810494A

CN111810494A - Hydraulic test bench for automobile solenoid valve

Info

Publication number: CN111810494A
Application number: CN202010767095.5A
Authority: CN
Inventors: 申海兵; 孙冬
Original assignee: Changzhou Vraic Automatic Equipment Technology Co ltd
Current assignee: Changzhou Vraic Automatic Equipment Technology Co ltd
Priority date: 2020-08-03
Filing date: 2020-08-03
Publication date: 2020-10-23

Abstract

The invention relates to the field of automobile solenoid valve detection, in particular to a hydraulic test bench for an automobile solenoid valve, which is arranged in a test frame. The hydraulic oil heating device can heat hydraulic oil, simulate the working state of the automobile electromagnetic valve under the condition of high temperature in the automobile, and can recycle the hydraulic oil in the oil way; the invention effectively collects oil liquid and oil mist generated in the detection process, keeps the cleanness in the cabin, simultaneously recycles redundant oil and has better economic benefit. Meanwhile, the invention integrates the test cabin and the detection cabin, and has the advantages of rich functions, compact structure and high space utilization rate.

Description

Hydraulic test bench for automobile solenoid valve

Technical Field

The invention belongs to the field of automobile solenoid valve detection, and particularly relates to a hydraulic test bench for an automobile solenoid valve.

Background

The automobile electromagnetic valve is an actuating element of an electronic control device, and whether the automobile runs safely is determined by the quality of the electromagnetic valve, so that the automobile electromagnetic valve needs to be detected in detail before leaving a factory, and the hydraulic test is very important because the automobile electromagnetic valve is in a pressure environment for a long time. The traditional automobile electromagnetic valve detection device is low in integration degree and large in size; meanwhile, the traditional automobile solenoid valve detection part is single, only one end is adopted for pressure transmission, the other end is adopted for detecting the solenoid valve, the test mode cannot detect the running state of the solenoid valve at high temperature, and meanwhile, data such as pressure values in the control test cannot be controlled.

The oil stain leakage is avoided in the test process, the cabin is untidy, and if the oil stain is mistakenly absorbed by an operator, certain influence is caused on the life health of the operator. The traditional test bench for the automobile solenoid valve is not provided with a test cabin, and is only exposed outside for testing, so that oil stains cannot be collected on one hand, and potential safety hazards also exist on the other hand.

Disclosure of Invention

The invention aims to provide a hydraulic test bench for an automobile solenoid valve, which can control the oil temperature of oil pressure and can finely adjust the pressure.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the hydraulic test bench for the automobile solenoid valve is characterized by comprising a test cabin and a hydraulic device, wherein the test cabin comprises a cabin body, the cabin body comprises a control cabin and a test cabin which are closely connected, the hydraulic device is arranged at the bottoms of the control cabin and the test cabin, and the outlet end and the return end of the hydraulic device are communicated with the test cabin.

Further, hydraulic means is including looping through oil tank unit, power pack, cooling unit, filtration steady voltage unit, pressure regulating unit and the backward flow unit of oil pipe intercommunication, the equipartition has the ball valve that control oil pipe cut-off between oil tank unit and the power pack, between backward flow unit and the oil tank unit.

Further, the tank unit includes:

the heat-insulating oil tank is internally provided with a cavity, the top of the heat-insulating oil tank is provided with an oil filling port, the bottom of the heat-insulating oil tank is provided with a pump oil outlet, the pump oil outlet is communicated with the power unit through an oil pipe, and the oil filling port is externally provided with an air filter capable of covering the oil filling port;

the liquid level meter penetrates through the upper surface of the heat-preservation oil tank and extends into the cavity;

the stirrer comprises a stirring motor arranged on the upper surface of the heat-insulating oil tank and a stirring head which is arranged in the cavity and driven by the stirring motor;

the heater comprises 3 to 5 heating rods arranged in parallel, and the heating rods extend from the bottom of the heat-insulating oil tank to the inside of the cavity.

Furthermore, the cooling unit comprises a cooling box with a hollow interior, a fan is arranged in the cooling box, the front end of the cooling unit is communicated with the power unit and the pressure regulating unit through oil pipes respectively, and the rear end of the cooling unit is communicated with the heat preservation unit through oil pipes.

Furthermore, the power unit comprises a driving motor and a high-temperature gear pump, the high-temperature gear pump is driven by the driving motor, two ends of the high-temperature gear pump are communicated with the heat preservation unit and the filtering and pressure stabilizing unit through oil pipes, and a first overflow valve is arranged between the power unit and the cooling unit.

Further, it has hollow base to filter the steady voltage unit, the base both ends respectively with the power pack with the pressure regulating unit communicates with each other, the base is separated by middle part check valve, the check valve both ends are equipped with filter and energy storage ware respectively, the filter is in the energy storage ware front end, the filter side still is equipped with differential pressure alarm.

Further, the pressure regulating unit comprises a pressure regulating valve group, a first flowmeter, a heating resistor and a pressure sensor which are sequentially communicated through an oil pipe; the rear end of the pressure regulating unit is communicated with the test cabin, the pressure regulating valve group comprises a second overflow valve, a speed regulating valve and a throttle valve, the pressure stabilizing filtering unit is respectively communicated with the second overflow valve and the speed regulating valve through a three-way oil pipe, the second overflow valve is arranged at the front end of the speed regulating valve, and the other end of the second overflow valve is communicated with the cooling unit; the rear end of the speed regulating valve is respectively communicated with a first flowmeter and a throttle valve through a three-way oil pipe, the throttle valve is arranged at the front end of the first flowmeter, and the other end of the throttle valve is communicated with the cooling unit; the rear end of the first flowmeter is communicated with a heating resistor and a pressure sensor through an oil pipe in sequence.

Furthermore, the backflow unit comprises a backflow pressure sensor and a second flowmeter, the front end of the second flowmeter is communicated with the test cabin, and the rear end of the second flowmeter is communicated with the heat preservation unit.

Furthermore, a control panel is arranged on one side of the control cabin, a first split cabin door which is on the same side as the control panel is arranged on the test cabin, a working table is arranged at the bottom of the inner side of the test cabin, an oil collecting funnel is arranged on the outer side of the bottom of the test cabin, a filter screen plate is arranged between the working table and the oil collecting funnel, and an oil mist collecting port is formed in the top of the test cabin.

Furthermore, digital input panel table and manometer have been seted up on control panel, the control cabin is kept away from one side of test cabin is equipped with single second hatch door, table surface includes the mesa body and sets up in the T type screw groove that supplies follow-up valve block assembly installation on the mesa body, the oil mist is collected mouthful and is equipped with communicating outward, to the fan is collected to the oil mist of the outdoor emission oil mist of test cabin, oil collection funnel bottom is equipped with the backflow pipeline that is used for the oil return, the relative border department of first hatch door of run-to-run is provided with the sealing strip, oil collection funnel with the test cabin junction has sealed the sealing washer.

In summary, compared with the conventional technical scheme, the technical scheme adopted by the invention has the following beneficial effects:

1. the hydraulic oil heating device can heat hydraulic oil, simulate the working state of the automobile electromagnetic valve under the condition of high temperature in the automobile, and can recycle the hydraulic oil in the oil way.

2. The invention can realize the functions of stabilizing and regulating the pressure of the oil way, effectively improve the use efficiency of the hydraulic pressure and stably provide the pressure.

3. The invention effectively collects oil liquid and oil mist generated in the detection process, keeps the cleanness in the cabin, simultaneously recycles redundant oil and has better economic benefit. Meanwhile, the invention integrates the test cabin and the detection cabin, and has the advantages of rich functions, compact structure and high space utilization rate.

Drawings

The foregoing and other objects, features, and advantages of the invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings.

FIG. 1 is a schematic view of the final assembly of the present invention;

FIG. 2 is a schematic diagram of the hydraulic apparatus of the present invention;

FIG. 3 is a schematic perspective view of a fuel tank unit according to the present invention;

FIG. 4 is a schematic cross-sectional view of a fuel tank unit according to the present invention;

FIG. 5 is a schematic view of the power unit of the present invention;

FIG. 6 is a schematic structural diagram of a filtering and pressure-stabilizing unit according to the present invention;

FIG. 7 is a schematic structural diagram of a voltage regulating unit according to the present invention;

FIG. 8 is a schematic view of the operation of the hydraulic apparatus of the present invention

FIG. 9 is a front view of a test chamber structure of the present invention;

fig. 10 is a schematic perspective view of a test chamber according to the present invention. .

Wherein:

100. the hydraulic device comprises a hydraulic device, 110, an oil tank unit, 111, a heat preservation oil tank, 1111, a cavity, 1112, an oil filling port, 1113, a pump oil outlet, 112, a liquid level meter, 113, a stirrer, 1131, a stirring motor, 1132, a stirring head, 114, a heater, 1141, a heating rod, 115, an air filter, 120, a power unit, 121, a driving motor, 122, a high-temperature gear pump, 123, a first overflow valve, 130, a cooling unit, 131, a cooling tank, 132. the system comprises a fan, a 140, a filtering and pressure stabilizing unit, a 141, a base, a 142, a one-way valve, a 143, a filter, a 1431, a differential pressure alarm, a 144, an accumulator, a 150, a pressure regulating unit, a 151, a pressure regulating valve bank, a 1511, a second overflow valve, a 1512, a speed regulating valve, a 1513, a throttle valve, a 152, a first flowmeter, 153, a heating resistor, a 154, a pressure sensor, a 160, a reflux unit, a 161, a reflux pressure sensor, a 162, a second flowmeter and a 170 ball valve;

200. the test chamber comprises a test chamber body 201, a chamber body 202, a control chamber 203, a test chamber 204, a control panel 205, a first chamber door 206, a workbench surface 207, an oil collecting funnel 208, a filter screen plate 209, an oil mist collecting port 210, a digital input panel 211, a pressure plate 212, a second chamber door 213, a T-shaped screw groove 214, an oil mist collecting fan 215, a return pipeline 216, a sealing strip 217 and a sealing ring.

Detailed Description

In light of the foregoing, it is intended that the following description be read in connection with the accompanying drawings and that the appended claims be construed as broadly as possible and that various changes and modifications may be made therein without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

The invention is further illustrated with reference to the following description of the drawings:

the hydraulic test platform for the automobile solenoid valve is arranged in a test frame, the test frame comprises a test cabin 200 and a hydraulic device 100, the test cabin 200 comprises a cabin body 201, the cabin body 201 comprises a control cabin 202 and a test cabin 200 chamber which are closely connected, the hydraulic device 100 is arranged at the bottom of the control cabin 202 and the test cabin, and the outlet end and the return end of the hydraulic device 100 are communicated with the test cabin 200 chamber.

The hydraulic device 100 comprises an oil tank unit 110, a power unit 120, a cooling unit 130, a filtering and pressure stabilizing unit 140, a pressure regulating unit 150 and a backflow unit 160 which are sequentially communicated through oil pipes, wherein ball valves 170 for controlling the opening and the closing of the oil pipes are uniformly distributed between the oil tank unit 110 and the power unit 120 and between the backflow unit 160 and the oil tank unit 110.

The tank unit 110 includes:

the heat-preservation oil tank is internally provided with a cavity 1111, the top of the heat-preservation oil tank is provided with an oil filling port 1112, the bottom end of the heat-preservation oil tank is provided with a pump oil outlet, and the pump oil outlet is communicated with the power unit 120 through an oil pipe;

the liquid level meter 112 penetrates through the upper surface of the self-insulation oil tank of the liquid level meter 112 and extends into the cavity 1111;

the stirrer comprises a stirring motor 1131 arranged on the upper surface of the heat-preservation oil tank and a stirring head 1132 which is arranged in the cavity 1111 and driven by the stirring motor 1131;

and the heater comprises heating rods arranged in parallel, and the bottoms of the self-heat-insulation oil tanks of the heating rods extend into the cavity 1111.

In the tank unit 110 described above, the hydraulic oil consumed in the test may be added through the oil filler 1112. The level meter 112 can monitor the level of the hydraulic oil in the cavity 1111 of the oil tank unit 110 in real time and feed back the level to the upper computer. The mixer then plays the stirring effect, makes things convenient for follow-up heater heating on the one hand, makes its heating more even, and on the other hand can prevent that hydraulic oil from not using its inside impurity subsides and leading to each opening of holding oil tank to block up after for a long time.

An air filter 115 is disposed outside the fuel filler 1112 to cover the fuel filler 1112.

The air filter 115 mainly has two functions: firstly, in order to prevent external impurities from floating into the heat-preservation oil tank along with the oil feeding port 1112, the quality of the hydraulic oil is affected; secondly, because the hydraulic oil is volatilized, a small amount of oil gas overflows from the oil filling port 1112, and the air filter 115 can filter the oil gas, thereby reducing the consumption of the hydraulic oil and preventing the pollution to the environment.

The cooling unit 130 comprises a cooling box 131 with a hollow interior, a fan 132 is arranged in the cooling box 131, the front end of the cooling unit 130 is communicated with the power unit 120 and the pressure regulating unit 150 through oil pipes respectively, and the rear end of the cooling unit is communicated with the heat preservation unit through oil pipes.

In consideration of the fact that the oil temperature is usually within the range of minus DEG C in the test process, an over-strong cooling facility is not needed, and the fan 132 air cooling mode is adopted, so that energy can be saved, and the hydraulic oil can reach the required temperature.

The power unit 120 comprises a driving motor 121 and a high-temperature gear pump 122, the high-temperature gear pump 122 is driven by the driving motor 121, two ends of the high-temperature gear pump 122 are communicated with the heat preservation unit and the filtering and pressure stabilizing unit 140 through oil pipes, and a first overflow valve 123 is arranged between the power unit 120 and the cooling unit 130.

The first relief valve 123 is provided in the sense that: because the oil pressure input into the filtering and pressure stabilizing unit 140 by the high-temperature gear pump 122 is greater than the required pressure, the pressure needs to be relieved, and the redundant pressure relieves the redundant hydraulic oil into the cooling unit 130 through the first overflow valve 123, so that the pressure is reduced, and the use requirement of the filtering and pressure stabilizing unit 140 is met.

The filtering and pressure stabilizing unit 140 has a hollow base 141, two ends of the base 141 are respectively communicated with the power unit 120 and the pressure regulating unit 150, the base 141 is separated by a middle one-way valve 142, two ends of the one-way valve 142 are respectively provided with a filter and an energy accumulator 144, and the filter is arranged at the front end of the energy accumulator 144.

The filter in the filtering and pressure stabilizing unit 140 filters impurities in the hydraulic oil, so as to prevent the influence of the impurities on the electromagnetic valve of the automobile from affecting the test result during the subsequent test. Meanwhile, the check valve 142 is provided to prevent the hydraulic oil that has not been filtered out from overflowing to the subsequent test. The accumulator 144 is used for storing part of oil pressure, and when the pressure in the subsequent oil circuit is insufficient, the accumulator 144 can release energy to supplement the part of pressure.

And a differential pressure alarm is also arranged on the side edge of the filter.

The effect of differential pressure alarm is mainly in time reporting to the police when the pressure release ability of first overflow valve 123 is not enough to let off unnecessary pressure, reminds the staff to suspend the experiment, prevents that the system from damaging.

The pressure regulating unit 150 comprises a pressure regulating valve group, a first flowmeter 152, a heating resistor 153 and a pressure sensor 154 which are sequentially communicated through oil pipes; the rear end of the pressure regulating unit 150 is communicated with the test cabin 200, the pressure regulating valve group comprises a second overflow valve 1511, a speed regulating valve 1512 and a throttle valve 1513, the pressure stabilizing filter unit is respectively communicated with the second overflow valve 1511 and the speed regulating valve 1512 through a three-way oil pipe, the second overflow valve 1511 is arranged at the front end of the speed regulating valve 1512, and the other end of the second overflow valve 1511 is communicated with the cooling unit 130; the rear end of the speed regulating valve 1512 is communicated with the first flowmeter 152 and a throttle valve 1513 respectively through a three-way oil pipe, the throttle valve 1513 is arranged at the front end of the first flowmeter 152, and the other end of the throttle valve 1513 is communicated with the cooling unit 130; the rear end of the first flowmeter 152 is connected to a heating resistor 153 and a pressure sensor 154 through an oil pipe in sequence.

In the pressure regulating unit 150, the function of the second overflow valve 1511 is similar to that of the first overflow valve 123, and when the oil pressure given by the previous pressure stabilizing and filtering unit is too high, the excessive pressure flows into the cooling unit 130 through the second overflow valve 1511 and finally flows back to the heat-preservation oil tank. The speed regulating valve 1512 is used to regulate the flow rate of the hydraulic oil in the oil path, and the throttle 1513 is used to control the flow rate in the subsequent oil path. When the flow rate needs to be adjusted, the throttle valve 1513 is opened to a corresponding opening degree, so that the excess hydraulic oil flows into the cooling unit 130 and finally flows back into the thermal oil tank.

The first flow meter 152 monitors whether the flow passing through the oil path meets the test requirements in real time. Because hydraulic oil can lose the heat in the flow process, and the preheating process that mainly goes on in the thermal-insulation oil tank moreover can not reach the temperature requirement of test completely, so adopt heating resistor 153 to carry out the secondary heating to the hydraulic oil that flows over in the thermal-insulation oil tank again, the hydraulic oil that reaches test temperature and pressure finally gets into in test chamber 200 and treats the car solenoid valve that detects and detect.

The return unit 160 includes a return pressure sensor 161154 and a second flow meter 162,

the second flow meter 162 communicates with the test chamber 200 at the front end and communicates with the thermal insulation unit at the rear end.

After the test chamber 200 finishes detection, the hydraulic oil flows back to the heat preservation oil tank through the backflow unit 160 for recycling, and the backflow pressure sensor 161154 and the second flow meter 162 monitor the pressure and the flow in the backflow pipeline in real time.

The working process of the invention is briefly explained:

the automobile electromagnetic valve to be tested is installed in the test chamber 200 and fixed, and after the automobile electromagnetic valve to be tested is communicated with surrounding pipelines, pressure and temperature parameters are set in the upper computer.

The heating rod in the heat-preservation oil tank is started, the stirrer and the liquid level meter 112 are started, and the hydraulic oil in the heat-preservation oil tank is heated and maintained at a certain temperature.

And (3) opening each group of ball valves 170, starting the operation of the high-temperature gear pump 122 in the power device, and pumping the hydraulic oil in the heat-preservation oil tank into the filtering and pressure-stabilizing unit 140.

The hydraulic oil is ready to flow into the filter, and if the pumped pressure is too high, the first relief valve 123 is opened, and the excess hydraulic oil is introduced into the cooling unit 130 and flows back into the thermal oil tank. After being filtered by the filter, the check valve 142 is opened, and if the pumping pressure is insufficient, the accumulator 144 is used for compensating the lack of pressure, and the hydraulic oil is ready to be input into the pressure regulating unit 150.

Before entering the pressure regulating unit 150, the second relief valve 1511 relieves the excess oil pressure, discharges the oil pressure into the cooling unit 130, and returns to the thermal oil tank. And the residual hydraulic oil enters the speed regulating valve 1512 to regulate the flow rate, the flow is monitored by the first flow meter 152 in real time, and if the flow is too large, the throttle valve 1513 is opened to guide the residual flow into the cooling unit 130 and return the residual flow to the heat preservation oil tank.

The heating resistor 153 then heats the hydraulic oil which is finally ready to enter the test chamber 200 to the temperature set by the upper computer.

The hydraulic oil returned from the test chamber 200 is returned to the thermal insulation oil tank through the return unit 160 for recycling, and the return pressure sensor 161154 and the second flow meter 162 monitor the pressure and the flow in the return line in real time.

A control panel 204 is arranged on one side of the control cabin 202, a first split cabin door 205 which is on the same side as the control panel 204 is arranged on the test cabin 200, a working table 206 is arranged at the bottom of the inner side of the test cabin 200, an oil collecting funnel 207 is arranged on the outer side of the bottom of the test cabin 200, a filter screen plate 208 is arranged between the working table 206 and the oil collecting funnel 207, and an oil mist collecting port 209 is arranged at the top of the test cabin 200.

In the test chamber 200 of the test stand for the solenoid valve of the automobile described above, the control chamber 202 is disposed in close proximity to the test chamber 200, which effectively reduces the volume thereof. The control panel 204 facilitates subsequent control of the various electronic components within the chamber body 201. The split first hatch 205 is convenient for taking or putting the electromagnetic valve to be tested, and the door opening distance is reduced. The solenoid valve to be tested is prevented on the table 206. Oil dropped by the electromagnetic valve permeates downwards from the filter screen plate 208 and drops into the oil collecting funnel 207, and the oil mist is discharged along with the oil mist collecting port 209. Can be effectively with the oil mist filtering clean in the cabin body 201, keep the cabin indoor clean and tidy, also effectively realize the recycle to waste oil.

The control panel 204 is provided with a digital input panel 210 and a pressure gauge. The interaction of the operators and the users is convenient.

The side of the control cabin 202 remote from the test cabin 200 is provided with a second single-opening door 212. The second door 212 prevents inadvertent contact with electrical components within the control chamber 202.

The table 206 includes a table body and a T-screw slot 213 formed in the table body for mounting a subsequent valve block assembly.

There is also provided an oil mist collecting fan 214132, and an oil mist collecting fan 214132 is communicated with the oil mist collecting port 209 and discharges the oil mist to the outside of the test chamber 200. Effectively collect oil mist.

The bottom of the oil collecting funnel 207 is provided with a return pipe 215 for returning oil. Effectively collect oil mist.

The sealing strips 216 are arranged at the opposite edges of the first split door 205, and the sealing ring 217 is sealed at the joint of the oil collecting funnel 207 and the test chamber 200 to prevent leakage.

Claims

1. The hydraulic test bench for the automobile solenoid valve is arranged in a test frame and is characterized in that the test frame comprises a test cabin and a hydraulic device, the test cabin comprises a cabin body, the cabin body comprises a control cabin and a test cabin which are closely connected, the hydraulic device is arranged at the bottoms of the control cabin and the test cabin, and the outlet end and the return end of the hydraulic device are communicated with the test cabin.

2. The hydraulic test bench for the automobile solenoid valve according to claim 1, wherein: the hydraulic device comprises an oil tank unit, a power unit, a cooling unit, a filtering and pressure stabilizing unit, a pressure regulating unit and a backflow unit which are sequentially communicated through an oil pipe, wherein ball valves for controlling the opening and the closing of the oil pipe are uniformly distributed between the oil tank unit and the power unit and between the backflow unit and the oil tank unit.

3. The hydraulic test stand for an automotive solenoid valve according to claim 2, characterized in that said oil tank unit comprises:

4. The hydraulic test bench for the automobile solenoid valve according to claim 2, wherein: the cooling unit comprises a cooling box with a hollow inner part, a fan is arranged in the cooling box, the front end of the cooling unit is communicated with the power unit and the pressure regulating unit through oil pipes respectively, and the rear end of the cooling unit is communicated with the heat preservation unit through oil pipes.

5. The hydraulic test bench for the automobile solenoid valve according to claim 2, wherein: the power unit comprises a driving motor and a high-temperature gear pump, the high-temperature gear pump is driven by the driving motor, two ends of the high-temperature gear pump are communicated with the heat preservation unit and the filtering and pressure stabilizing unit through oil pipes, and a first overflow valve is arranged between the power unit and the cooling unit.

6. The hydraulic test bench for the automobile solenoid valve according to claim 2, wherein: the filtering and pressure stabilizing unit is provided with a hollow base, the two ends of the base are respectively communicated with the power unit and the pressure regulating unit, the base is separated by a middle one-way valve, the two ends of the one-way valve are respectively provided with a filter and an energy accumulator, the filter is arranged at the front end of the energy accumulator, and the side edge of the filter is also provided with a differential pressure alarm.

7. The hydraulic test bench for the automobile solenoid valve according to claim 2, wherein: the pressure regulating unit comprises a pressure regulating valve group, a first flowmeter, a heating resistor and a pressure sensor which are sequentially communicated through an oil pipe; the rear end of the pressure regulating unit is communicated with the test cabin, the pressure regulating valve group comprises a second overflow valve, a speed regulating valve and a throttle valve, the pressure stabilizing filtering unit is respectively communicated with the second overflow valve and the speed regulating valve through a three-way oil pipe, the second overflow valve is arranged at the front end of the speed regulating valve, and the other end of the second overflow valve is communicated with the cooling unit; the rear end of the speed regulating valve is respectively communicated with a first flowmeter and a throttle valve through a three-way oil pipe, the throttle valve is arranged at the front end of the first flowmeter, and the other end of the throttle valve is communicated with the cooling unit; the rear end of the first flowmeter is communicated with a heating resistor and a pressure sensor through an oil pipe in sequence.

8. The hydraulic test bench for the automobile solenoid valve according to claim 2, wherein: the backflow unit comprises a backflow pressure sensor and a second flowmeter, the front end of the second flowmeter is communicated with the test chamber, and the rear end of the second flowmeter is communicated with the heat preservation unit.

9. The hydraulic test bench for the automobile solenoid valve according to claim 1, wherein: the oil mist testing device is characterized in that a control panel is arranged on one side of the control cabin, a first split cabin door which is arranged on the same side as the control panel is arranged on the test cabin, a working table is arranged at the bottom of the inner side of the test cabin, an oil collecting funnel is arranged on the outer side of the bottom of the test cabin, a filter screen plate is arranged between the working table and the oil collecting funnel, and an oil mist collecting port is formed in the top of the test cabin.

10. The hydraulic test bench for the automobile solenoid valve according to claim 9, wherein: the utility model discloses an oil mist testing machine, including test cabin, table surface, oil collection funnel, table surface, T type screw groove, oil mist collection mouth, oil collection funnel bottom is equipped with the backflow pipeline that is used for the oil return, the relative border department of first hatch door of run to is provided with the sealing strip, oil collection funnel with the test cabin junction has sealed the sealing washer.