CN216666098U

CN216666098U - Universal test bench for hydraulic valve

Info

Publication number: CN216666098U
Application number: CN202123178053.7U
Authority: CN
Inventors: 汪志贤; 雷振; 张明; 马为
Original assignee: Shanghai Nuoge Intelligent System Engineering Co ltd
Current assignee: Shanghai Nuoge Intelligent System Engineering Co ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-06-03
Anticipated expiration: 2031-12-17

Abstract

The utility model provides a general test bed for hydraulic valves, which relates to the technical field of electromagnetic directional valve tests and comprises a bed assembly, wherein a hydraulic system and an electrical control system are installed in the bed assembly. The oil leakage recovery power unit is used for recovering oil return in leakage test, oil return generated by blowing and discharging oil after the tested valve test and other table top oil leakage, and when the liquid level of the oil tank reaches a certain position, the gear pump set is started to pump the oil back to the main oil tank, so that the oil leakage recovery power unit can be used for delivery test of the DN6 electromagnetic directional valve, and has the advantages of simple structure and convenient use.

Description

Universal test bench for hydraulic valve

Technical Field

The utility model relates to the technical field of electromagnetic directional valve tests, in particular to a general test bed for hydraulic valves.

Background

The electromagnetic directional valve is a main component element of a hydraulic system and is used for controlling the flowing direction of oil liquid or the on and off of liquid flow in the hydraulic system so as to control the start, stop or direction change of an execution element, and the element belongs to a control and regulation element.

After the electromagnetic directional valve is completed in the preparation, the test that dispatches from the factory need be carried out, generally adopts the test bench to go on, but the test bench in existing market, the machine structure of test bench is too complicated, and the person of not being convenient for uses, and experimental effect is also not good, can't satisfy the requirement of experimenter to the general test bench of hydraulic pressure valve member.

Disclosure of Invention

The utility model provides a universal test bench for hydraulic valves, which can be used for delivery tests of DN6 electromagnetic directional valves, and is simple in structure and convenient to use.

In order to achieve the purpose, the utility model provides the following technical scheme:

the hydraulic valve universal test bench comprises a bench assembly, wherein a hydraulic system and an electric control system are installed in the bench assembly, the hydraulic system comprises a main hydraulic system, a pressing device and an oil leakage recovery power unit, the main hydraulic system comprises a first proportional overflow valve, a throttle valve, a first overflow valve, a first hydraulic control reversing valve, a second hydraulic control reversing valve, a turbine flowmeter, a third hydraulic control reversing valve, a first check valve, a second proportional overflow valve, a high-pressure filter, a first electromagnetic reversing valve, a second electromagnetic reversing valve, a gear flowmeter and a first pressure sensor, the first proportional overflow valve and the throttle valve are communicated between a P11 oil path and a T12 oil path, the first pressure sensor is installed on a P11 oil path, a P12 oil path and each working oil path of a test base plate, the first oil path is communicated between a P12 oil path and a T13 oil path, and the first check valves are provided with four overflow valves, the four first check valves and the second proportional overflow valve form a bridge type loading loop, so that bidirectional loading of the working loop of the tested valve can be realized; the high-pressure filter is communicated with an oil inlet of the second proportional overflow valve, the number of the first electromagnetic directional valves is two, the first electromagnetic directional valves are respectively communicated among an oil path A, an oil path B and an oil path P11, the number of the second electromagnetic directional valves is three, the second electromagnetic directional valves are respectively communicated among the oil path A, the oil path B, the oil path T and the gear flow meter, the gear flow meter is installed on an oil path between the second electromagnetic directional valve and an oil port L11, the number of the first hydraulic directional valves is four, the four first hydraulic directional valves are respectively installed on the oil path P, the oil path T, the oil path B and the oil path A, the number of the second hydraulic directional valves is two, the second hydraulic directional valves are respectively located on the oil paths T11 and T12, the third hydraulic directional valve is installed on an oil path between the bridge type loading loop and the second hydraulic directional valve, the compressing device comprises an oil tank assembly, a first gear pump set, a first oil suction filter and a second oil suction filter, The oil leakage recovery power unit comprises a second gear pump set, a second oil absorption filter, a pipeline filter and a liquid level switch.

Preferably, the oil tank assembly comprises an oil tank, an air filter and a liquid level thermometer, and the air filter and the liquid level thermometer are both mounted on the oil tank.

Preferably, the first gear pump group consists of a motor, a gear pump, a bell jar and a coupling.

Preferably, the control valve group comprises a second overflow valve, a second one-way valve, a third electromagnetic directional valve, a fourth electromagnetic directional valve, a hydraulic lock and a one-way throttle valve, the second overflow valve and the third electromagnetic directional valve are communicated between an outlet oil path and an oil return path, the second one-way valve is located on the outlet oil path, and the fourth electromagnetic directional valve, the hydraulic lock and the one-way throttle valve are plate-type superposed valves and are arranged on the control valve block to respectively form control loops of oil cylinders at different stations.

Preferably, the second pressure sensor is attached to oil passages a1 and a 2.

Preferably, the second gear pump set comprises a motor, a gear pump, a bell jar and a coupling.

Preferably, the second oil absorption filter and the pipeline filter have filtering precisions of 80 mu and 5 mu respectively.

Preferably, the safety protection pressure of the first proportional relief valve is set to 315 bar.

Compared with the prior art, the utility model has the advantages and positive effects that,

the utility model provides oil with certain pressure and flow, different functional test loops are formed by switching through a control unit, and related pressure, temperature, flow and the like are set for detection, the hydraulic system comprises a main hydraulic system, a pressing device and an oil leakage recovery power unit, the main hydraulic system can realize the functions of switching of each working oil circuit, system flow regulation, system pressure and load pressure regulation, safety protection and the like, the pressing operation of two groups of tested valves can be simultaneously realized through the pressing device, the pressing force can be regulated according to the actual situation, the oil leakage recovery power unit is used for recovering leakage test return oil, return oil generated by blowing and oil discharging after the tested valves are tested, and other table top oil leakage and the like, when the liquid level of an oil tank reaches a certain position, a gear pump set is started to pump the oil back to the main oil tank, and can be used for the factory test of a DN6 electromagnetic directional valve, simple structure and convenient use.

Drawings

FIG. 1 is a schematic diagram of a universal test bed for hydraulic valves according to the present invention;

FIG. 2 is a hydraulic schematic diagram of a main system of a universal test bed for hydraulic valves according to the present invention;

FIG. 3 is a hydraulic schematic diagram of a pressing device of a universal test bench for hydraulic valves according to the present invention;

fig. 4 is a liquid leakage recovery hydraulic schematic diagram of a general test bench for hydraulic valves according to the present invention.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

referring to fig. 1-4, the present invention provides a technical solution: the hydraulic valve universal test bench comprises a bench assembly 100, a hydraulic system and an electric control system are installed in the bench assembly 100, the hydraulic system comprises a main hydraulic system, a pressing device and an oil leakage recovery power unit, the main hydraulic system comprises a first proportional overflow valve 1, a throttle valve 2, a first overflow valve 3, a first hydraulic control reversing valve 4, a second hydraulic control reversing valve 5, a turbine flowmeter 6, a third hydraulic control reversing valve 7, a first check valve 8, a second proportional overflow valve 9, a high-pressure filter 10, a first electromagnetic reversing valve 11, a second electromagnetic reversing valve 12, a gear flowmeter 13 and a first pressure sensor 14, the first proportional overflow valve 1 and the throttle valve 2 are communicated between a P11 oil circuit and a T12 oil circuit, the first pressure sensor 14 is installed on a P11 oil circuit, a P12 oil circuit and each working oil circuit of a test base plate, the first overflow valve 3 is communicated between a P12 oil circuit and a T13 oil circuit, the first check valves 8 are provided with four, and the four first check valves and the second proportional overflow valve 9 form a bridge type loading loop, so that bidirectional loading of the working loop of the tested valve can be realized; the high-pressure filter 10 is communicated with an oil inlet of the second proportional overflow valve, the number of the first electromagnetic directional valves 11 is two, the first electromagnetic directional valves are respectively communicated among an oil path A, an oil path B and an oil path P11, the number of the second electromagnetic directional valves 12 is three, the second electromagnetic directional valves are respectively communicated among the oil path A, the oil path B, the oil path T and the gear flow meter, the gear flow meter 13 is installed on an oil path between the second electromagnetic directional valve and an oil port L11, the number of the first hydraulic directional valves 4 is four, the four first hydraulic directional valves 4 are respectively installed on the oil path P, the oil path T, the oil path B and the oil path A, the number of the second hydraulic directional valves 5 is two, the second hydraulic directional valves are respectively located on the oil paths T11 and T12, and the third hydraulic directional valve 7 is installed on an oil path between the bridge type loading loop and the second hydraulic directional valve. The compressing device comprises an oil tank assembly, a first gear pump group 18, a first oil absorption filter 19, a control valve group, an oil cylinder 26 and a second pressure sensor 27, an oil suction port of the first gear pump group is communicated with the oil tank through the first oil absorption filter, and the leaked oil recovery power unit comprises a second gear pump group 28, a second oil absorption filter 29, a pipeline filter 30 and a liquid level switch 31.

In the embodiment, the throttle valve 2 is ｃA manual regulation throttle valve, the regulation of the system oil supply flow is realized by changing the opening size of the throttle valve, the first overflow valve 3 is used for setting ｃA pilot control pressure, the working pressure is set to 70bar, the first hydraulic control reversing valve 4 is used for controlling the on-off of an P, T, B, A oil path, the second hydraulic control reversing valve 5 is used for controlling the system oil return, the turbine flowmeter 6 is used for detecting the system test return oil flow, the third hydraulic control reversing valve 7 is used for forming ｃA P-A-T or P-B-T working loop, the first check valve 8 and the second proportional overflow valve 9 jointly form ｃA bridge type loading loop, the loading pressure is regulated by the fourth proportional overflow valve 9, the first electromagnetic reversing valve 11 is used for supplying oil to ｃA tested valve port B, A and determining the slide valve function of the tested valve, and the second electromagnetic reversing valve 12 is used for ｃA tested valve port T, B. The on-off control of the leakage oil path of the A can select to open the relevant electromagnetic directional valve according to the function of the tested valve to perform an internal leakage test, the gear flowmeter 13 is used for detecting the leakage flow, and the first pressure sensor 14 is used for detecting the pressure of each working oil path in real time.

Further, the oil tank assembly comprises an oil tank 15, an air filter 16 and a liquid level thermometer 17, wherein the air filter 16 and the liquid level thermometer 17 are both mounted on the oil tank 15.

In this embodiment, the liquid level can be monitored, and the air filtered.

Further, the first gear pump group 18 is composed of a motor, a gear pump, a bell jar and a coupling.

In this embodiment, the first gear-pump set 18 is used to provide oil at a certain pressure and flow rate to the system.

Furthermore, the control valve group comprises a second overflow valve 20, a second one-way valve 21, a third electromagnetic directional valve 22, a fourth electromagnetic directional valve 23, a hydraulic lock 24 and a one-way throttle valve 25, the second overflow valve 20 and the third electromagnetic directional valve 22 are communicated between an oil path at the outlet of the pump and an oil return path, the second one-way valve 21 is positioned on the oil path at the outlet of the pump, and the fourth electromagnetic directional valve 23, the hydraulic lock 24 and the one-way throttle valve 25 are plate-type superposed valves and are arranged on the control valve block to respectively form control loops of oil cylinders at different stations.

In this embodiment, the control valve set integrates functions of system pressure adjustment, control circuit switching, throttling speed regulation, pressure maintaining, system pressure relief and the like, the second overflow valve 20 is used for adjusting the system working pressure, the second check valve 21 is used for protecting a gear pump and preventing high-pressure oil backflushing, the third electromagnetic directional valve 22 is used for unloading and loading the system, the valve is controlled to work at different working positions through power failure of the third electromagnetic directional valve 22 to realize related functions, the fourth electromagnetic directional valve 23 is used for controlling the oil cylinders 26 of different testing stations to act, the oil cylinders 26 are lifted or lowered through switching of different working positions, the hydraulic lock 24 is used for controlling the holding of the compression pressure of the oil cylinders 26 of different testing stations, the one-way throttle valve 25 is used for adjusting the operating speed of the oil cylinders 26 of different testing stations, and the throttle control circuit is oil return.

Further, the second pressure sensor 27 is attached to the oil passages a1, a 2.

In the present embodiment, the second pressure sensor 27 is used to detect whether the holding pressure of each cylinder 26 drops, and if the pressure drops beyond a prescribed value during the test, the first gear-pump group 18 operates to depress the cylinder 26 to the prescribed holding pressure.

Furthermore, the second gear pump set 28 comprises a motor, a gear pump, a bell jar and a coupling.

In this embodiment, the second gear pump set 28 motor is used to provide oil at a certain pressure and flow rate.

Further, the second oil suction filter 29 and the line filter 30 have filtering accuracies of 80 μ and 5 μ, respectively.

In this embodiment, a second suction filter 29 and an in-line filter 30 are used to filter the oil that is delivered back to the system.

Further, the relief pressure of the first proportional relief valve 1 is set to 315 bar.

In the embodiment, the additional spring-loaded pilot valve of the first proportional relief valve 1 can realize system safety protection by limiting the maximum pressure, the system protection pressure is set to be 315bar, and the adjustment of the working pressure is realized by the change of an electric signal.

The rack assembly 100 of the utility model mainly comprises a base, a tooling turntable, an outer frame body, an automatic butt joint mechanism, a front butt joint mechanism, an air blowing and oil discharging device and the like. The automatic rotation testing device is used for realizing the automatic rotation of the tooling rotary table, the automatic butt joint of the testing oil path and the oil discharge gas path and the air blowing and oil discharge functions, and the rotation and the positioning of the rotary table are realized by a cam divider; the action of each docking device and the air blowing and oil discharging are realized by a pneumatic system.

Meanwhile, the mechanical device is provided with a proximity switch, a photoelectric switch, a magnetic switch and the like, and is used for detecting whether the tested element exists or not, the in-place condition of each actuating mechanism and the like and serving as a linkage condition of automatic testing.

The front and the back of the rack are divided into a clamping area and a testing area. After the clamping of the tested piece in the clamping area is completed, the tested piece is rotated by 180 degrees to the testing area by the high-precision turntable, after an oil circuit is automatically switched on, according to the setting of testing software, a testing program is automatically operated, in the testing process, the other half of the turntable is in the clamping area, a next group of tested pieces can be simultaneously clamped, the time is saved, and the working efficiency is improved.

In this embodiment, the electrical control system comprises a low-voltage apparatus and a programmable logic controller PLC, which jointly form the electrical control system, and the PLC controls the operation of the system through operation instructions such as logic operation, sequence control, arithmetic operation, and the like, and input and output of digital quantity and analog quantity.

The basic functions of the data acquisition and processing system are signal detection, real-time control, data processing, test formula and test subject purpose setting and selection, user management, test report output and data management.

The test software is compiled based on Labview, and a software interface displays the current product model, the current software working state, the information of a login person, the total number of current tests, the NG number, the OK number, the beat time, the running time and the standby time in real time, wherein the current test information comprises the name of the current test process, the model specification, the picture of a tested piece, the pressure or flow measurement value and the like. The user can self-define the product process name, and the software automatically executes the corresponding process flow after the code is scanned or the product process name is input.

In use, the experimental subjects were as follows:

1) and (3) pressure resistance test: and respectively applying 1.5 times of the highest working pressure (350 bar at the highest) of the oil ports to each pressure-bearing oil port at the speed of 2% per second, and keeping the pressure for 5 min.

2) The slide valve function: according to the function of the tested valve, the valve is reversed and reset in sequence. Meanwhile, the pressure of each oil port is detected through a pressure sensor, and whether the sliding valve can be correct or not is judged.

3) The reversing performance is as follows: and under the specified test flow and working pressure, the electromagnet of the tested valve is powered on and off, and the valve continuously acts for more than one time, so that the reversing and resetting conditions of the tested valve are tested.

4) Pressure loss: and (3) under the specified test flow, placing the valve core of the tested valve at each oil passing position, detecting the pressure of each oil port of the tested valve through a pressure sensor, and calculating the pressure loss of each oil path.

5) Internal leakage amount: under the specified test pressure, internal leakage amount of the valve core of the tested valve at different positions is measured from the A (or B) oil port and the T oil port respectively according to different slide valve functions and structures.

6) Sealing property: firstly, wiping the tested valve, and respectively visually checking whether the static seal and the dynamic seal of the tested valve have oil leakage after the test is finished.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.

Claims

1. The hydraulic valve universal test bench comprises a bench assembly and is characterized in that a hydraulic system and an electric control system are installed in the bench assembly, the hydraulic system comprises a main hydraulic system, a pressing device and an oil leakage recovery power unit, the main hydraulic system comprises a first proportional overflow valve, a throttle valve, a first overflow valve, a first hydraulic control reversing valve, a second hydraulic control reversing valve, a turbine flowmeter, a third hydraulic control reversing valve, a first check valve, a second proportional overflow valve, a high-pressure filter, a first electromagnetic reversing valve, a second electromagnetic reversing valve, a gear flowmeter and a first pressure sensor, the first proportional overflow valve and the throttle valve are communicated between a P11 oil path and a T12 oil path, the first pressure sensor is installed on each working oil path of a P11 oil path, a P12 oil path and a test base plate, the first overflow valve is communicated between a P12 oil path and a T13 oil path, the first check valves are provided with four, and the four first check valves and the second proportional overflow valve form a bridge type loading loop, so that bidirectional loading of the working loop of the tested valve can be realized; the high-pressure filter is communicated with an oil inlet of the second proportional overflow valve, the number of the first electromagnetic directional valves is two, the first electromagnetic directional valves are respectively communicated among an oil path A, an oil path B and an oil path P11, the number of the second electromagnetic directional valves is three, the second electromagnetic directional valves are respectively communicated among the oil path A, the oil path B, the oil path T and the gear flow meter, the gear flow meter is installed on an oil path between the second electromagnetic directional valve and an oil port L11, the number of the first hydraulic directional valves is four, the four first hydraulic directional valves are respectively installed on the oil path P, the oil path T, the oil path B and the oil path A, the number of the second hydraulic directional valves is two, the second hydraulic directional valves are respectively located on the oil paths T11 and T12, the third hydraulic directional valve is installed on an oil path between the bridge type loading loop and the second hydraulic directional valve, the compressing device comprises an oil tank assembly, a first gear pump set, a first oil suction filter and a second oil suction filter, The oil leakage recovery power unit comprises a second gear pump set, a second oil absorption filter, a pipeline filter and a liquid level switch.

2. The hydraulic valve piece universal test rig of claim 1, wherein: the oil tank subassembly includes oil tank, air cleaner and liquid level liquid thermometer all install on the oil tank.

3. The hydraulic valve piece universal test rig of claim 1, wherein: the first gear pump group is composed of a motor, a gear pump, a bell jar and a coupler.

4. The hydraulic valve piece universal test rig of claim 1, wherein: the control valve group comprises a second overflow valve, a second one-way valve, a third electromagnetic directional valve, a fourth electromagnetic directional valve, a hydraulic lock and a one-way throttle valve, the second overflow valve and the third electromagnetic directional valve are communicated between an outlet oil way and an oil return way, the second one-way valve is positioned on the outlet oil way, and the fourth electromagnetic directional valve, the hydraulic lock and the one-way throttle valve are plate-type superposed valves and are arranged on a control valve block to respectively form control loops of oil cylinders with different stations.

5. The hydraulic valve piece universal test rig of claim 1, wherein: the second pressure sensor is mounted on oil passages a1, a 2.

6. The hydraulic valve piece universal test rig of claim 1, wherein: the second gear pump set comprises a motor, a gear pump, a bell jar and a coupler.

7. The hydraulic valve piece universal test rig of claim 1, wherein: the filtering precision of the second oil absorption filter and the pipeline filter is respectively 80 mu and 5 mu.

8. The hydraulic valve piece universal test rig of claim 1, wherein: the safety protection pressure of the first proportional relief valve is set to 315 bar.