Portable Hydraulic Test Bench

Abstract

The present invention relates to the field of mobile hydraulic test equipment, and particularly to a mobile hydraulic test bench, which comprises a frame, and an experimental device and a control cabinet arranged on the frame. The experimental device comprises a main hydraulic pump, and a motor, a hydraulic oil tank and a hydraulic oil circuit connected to the main hydraulic pump. The control cabinet is provided with a test platform for connecting to the hydraulic oil circuit through a plug connector to test the performance of components in the hydraulic oil circuit, a display screen for displaying the test detection data of the component performance, and a pressure gauge row for testing the pressure data of the hydraulic oil circuit. The structure of the present invention is simple, the design is novel and reasonable, and it is professionally designed for the hydraulic components on the tunnel boring machine, which can meet the experimental detection of the hydraulic components on the tunnel boring machine. At the same time, the test bench has a high integration degree and occupies a small volume, and can be placed in the equipment concentration area or the maintenance and transformation base of the old tunnel boring machine, so that it can be used at any time when needed, and has strong application value.

Description

Technical Field

[0001] The present invention relates to the field of mobile hydraulic test equipment, and particularly to a mobile hydraulic test bench. Background Art

[0002] At present, tunnel boring machines, including shield machines, TBMs, etc., are developing faster and faster. The main transmission method of tunnel boring machines is hydraulic transmission. During the use of hydraulic components, wear, deformation or damage may occur. At this time, it is often necessary to judge whether the old components are damaged or to re-calibrate them when replacing new components. The usual way to solve this problem is to send them back to the manufacturer for inspection or calibration. Since the manufacturer has professional large-scale hydraulic test benches and tunnel boring machines are distributed all over the country, sending them back to the manufacturer not only wastes transportation costs but also delays the construction period. Therefore, there is an urgent need for a mobile hydraulic test bench that can be easily placed at equipment concentration areas or at the maintenance and renovation bases of old tunnel boring machines, so that it can be used at any time as needed, in order to improve the maintenance efficiency of tunnel boring machines and reduce the operation cost. Summary of the Invention

[0003] Therefore, the present invention provides a mobile hydraulic test bench that can be used at any time, is easy to move, occupies a small area, and has a high degree of integration.

[0004] According to the design scheme provided by the present invention, a mobile hydraulic test bench includes: a frame, an experimental device and a control cabinet arranged on the frame. The experimental device includes: a main hydraulic pump, a motor, a hydraulic oil tank and a hydraulic oil circuit connected to the main hydraulic pump; on the control cabinet, there is a test platform for connecting to the hydraulic oil circuit through a plug connector to test the performance of components in the hydraulic oil circuit, a display screen for displaying test data of component performance, and a pressure gauge row for testing the pressure data of the hydraulic oil circuit; the hydraulic oil circuit includes a main oil circuit for providing an oil source, a control oil circuit for controlling the oil source, a high-pressure oil circuit for increasing the oil source pressure during high-pressure tests, a filter circulation oil circuit for filtering the hydraulic oil in the hydraulic oil tank, a waste oil collection circuit for recovering the hydraulic oil in each oil circuit, and a valve group test oil circuit for testing each valve in the oil circuit; each oil circuit is respectively connected to the corresponding pressure gauges in the pressure gauge row.

[0005] As the mobile hydraulic test bench of the present invention, further, the oil source of the main oil circuit adopts a constant power pump connected to the plug connector of the test platform. The constant power pump is connected in parallel with a proportional relief valve, and the outlet of the constant power pump is sequentially connected in series with a check valve, a filter, a flow meter and a proportional multi-way valve; and a ball valve for cylinder pressure holding test is connected in series at one of the outlets of the proportional multi-way valve.

[0006] As the movable hydraulic test bench of the present invention, further, the oil source of the control oil circuit adopts a constant pressure variable pump connected to the test platform plug connector. The constant pressure variable pump is connected in parallel with an overflow valve, and the outlet of the constant pressure variable pump is successively connected in series with a check valve and a filter. A safety protection overflow valve is connected in parallel at the pump outlet. A series-connected ball valve is used as a spare test interface for the flow valve, and / or a series-connected proportional pressure reducing valve is used to remotely adjust the hydraulic oil pressure.

[0007] As the movable hydraulic test bench of the present invention, further, a reversing valve for switching different control oil circuits of the same component under test is connected in series at the outlet of the proportional pressure reducing valve.

[0008] As the movable hydraulic test bench of the present invention, further, the oil source of the high-pressure oil circuit adopts a fixed-displacement pump connected to the test platform plug connector. A pressure regulating overflow valve for pressure regulation and a solenoid valve for pump loading are connected in parallel at the outlet of the fixed-displacement pump. A check valve for preventing the backflow of hydraulic oil is connected in series at the outlet of the fixed-displacement pump.

[0009] As the movable hydraulic test bench of the present invention, further, the oil source of the filter circulation oil circuit adopts a fixed-displacement vane pump connected to the test platform plug connector, and a filter, an air-cooled radiator, and an oil return filter are successively connected in series in the oil circuit and connected to the hydraulic oil tank.

[0010] As the movable hydraulic test bench of the present invention, further, the oil source of the waste oil collection oil circuit adopts a micro hydraulic pump connected to the test platform plug connector, and a filter is connected in series at the outlet of the micro hydraulic pump. The waste oil in the oil circuit is filtered and then sent to the hydraulic oil tank.

[0011] As the movable hydraulic test bench of the present invention, further, the valve group test oil circuit includes two working oil circuits, namely circuit A and circuit B, which are connected to the test platform plug connector and merged through a hydraulic bridge. The outlet of the hydraulic bridge is successively connected with a proportional overflow valve, a flow meter, a switching valve, and an oil return filter; the inlet of the hydraulic bridge is connected to the outlet of the filter circulation pump through a switching valve.

[0012] As the movable hydraulic test bench of the present invention, further, the valve group test oil circuit also includes: a test oil circuit for detecting the through-hole series stacking valves of the shield machine, which is connected to the filter circulation pump and the test platform plug connector.

[0013] As the movable hydraulic test bench of the present invention, further, the frame includes a base and a support frame fixed to one side of the base. The control cabinet is arranged on the other side of the base. There are pores on the base for forklift reverse transportation; the base is laid with steel profiles, and lifting lugs are arranged on the steel profiles. Further, protective plates are fixed around and on the top of the frame, and the protective plate on one side of the control cabinet and the adjacent top protective plate are slidably fitted and installed.

[0014] The beneficial effects of the present invention:

[0015] The structure of the present invention is simple, novel and reasonable. It is specially designed for the hydraulic components on the tunnel boring machine and can fully meet the experimental detection of the hydraulic components on the tunnel boring machine. At the same time, the test bench has a high degree of integration and occupies a small volume. It can be placed in the equipment concentration area or the maintenance and transformation base of the old tunnel boring machine, so that it can be used at any time when needed, and has strong popularization and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural view of the mobile hydraulic test bench in the embodiment;

[0017] Figure 2 It is a top view schematic of the mobile hydraulic test bench in the embodiment;

[0018] Figure 3 It is a schematic structural view of the test bench with a protective plate added in the embodiment;

[0019] Figure 4 It is a top view schematic of the test bench with a protective plate added in the embodiment;

[0020] Figure 5 It is a schematic diagram of the principle of each hydraulic oil circuit in the embodiment.

[0021] In the figures, reference numeral 1 represents the base, reference numeral 2 represents the hydraulic oil tank, reference numeral 3 represents the control cabinet, reference numeral 4 represents the control pump, reference numeral 5 represents the main oil pump, reference numeral 6 represents the air-cooled radiator, reference numeral 7 represents the high-pressure pump, reference numeral 8 represents the suction ball valve of the main oil pump, reference numeral 9 represents the sewage disposal equipment, reference numeral 10 represents the pressure gauge row, reference numeral 11 represents the filter cooling pump, reference numeral 12 represents the filter, reference numeral 13 represents the check valve, reference numeral 14 represents the multi-way valve, reference numeral 15 represents the test platform, reference numeral 16 represents the test valve block, and reference numerals 17 / 18 represent the protective plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present invention will be further described in detail below in conjunction with the drawings and technical solutions, and the embodiments of the present invention will be described in detail through preferred embodiments, but the embodiments of the present invention are not limited thereto.

[0023] In the embodiment of the present invention, refer to Figure 1 、 2As shown in FIGS. 0 and 5, a movable hydraulic test bench is provided, which includes: a frame, an experimental device and a control cabinet 3 arranged on the frame. The experimental device includes: a main hydraulic pump, a motor, a hydraulic oil tank 2 and a hydraulic oil circuit connected to the main hydraulic pump; a test platform 15 for connecting to the hydraulic oil circuit through a plug connector to test and detect the performance of components in the hydraulic oil circuit, a display screen for displaying test and detection data of component performance, and a pressure gauge row 10 for testing the pressure data of the hydraulic oil circuit are arranged on the control cabinet 3. The hydraulic oil circuit includes a main oil circuit for providing an oil source, a control oil circuit for controlling the oil source, a high-pressure oil circuit for increasing the oil source pressure in high-pressure tests, a filter circulation oil circuit for filtering the hydraulic oil in the hydraulic oil tank 2, a waste oil collection circuit for recovering the hydraulic oil in each oil circuit, and a valve group test oil circuit for testing each valve in the oil circuit; each oil circuit is respectively connected to the corresponding pressure gauges in the pressure gauge row 10. The hydraulic components on the tunnel boring machine are professionally designed, which can fully meet the experimental detection of the hydraulic components on the tunnel boring machine. At the same time, the test bench has a high integration degree and a small occupied volume, and can be placed in the equipment concentration area or the maintenance and transformation base of the old tunnel boring machine, so that it can be used at any time when needed, reducing the maintenance cost and improving the construction efficiency of the boring machine.

[0024] Further, the oil source of the main oil circuit adopts a constant power pump 5 and is connected in parallel with a proportional relief valve. The outlet of the constant power pump 5 is successively connected in series with a filter 12, a filter 12, a flow meter and a proportional filter 14; and a ball valve 8 for cylinder pressure holding test is connected in series at one of the outlets of the proportional filter 14.

[0025] The conventional main oil circuit generally uses an electronic pump to change the pump displacement for speed regulation or uses an ordinary variable pump plus a speed control valve for speed regulation. Such a design often results in a large pump power, a relatively large motor volume, and occupies a large amount of space. Some small mobile test benches directly adopt a fixed-displacement pump plus a speed control valve for speed regulation, which results in high energy consumption and serious heating. To avoid the above defects, in the embodiments of this case, a constant-power pump plus a proportional multi-way valve is used for speed regulation. This can reduce the pump power and the motor volume. At the same time, by abandoning the traditional speed control valve for speed regulation and using a proportional multi-way valve for speed regulation, speed regulation and commutation can be controlled simultaneously, which is simple and convenient, facilitating the testing of valves with different flow rates and also the testing of motors. To achieve convenient operation, a remote proportional relief valve is connected to the pump outlet for pressure regulation, so that speed regulation and pressure regulation can be directly performed on the operation panel during testing. Considering that a high-pressure pump is added separately to this test bench, a check valve is connected in series at the main pump port to prevent oil from flowing back when the high-pressure pump is used. Filters 12, filters 12, a flow meter, and a proportional filter 14 are connected in series at the pump outlet. Filter 12 is mainly used to prevent oil from flowing back when the high-pressure pump is used. Filter 12 is filtered at a 5-μm level to meet the requirements for the use of components of the roadheader. The flow meter can observe the flow rate of the oil passing through the test piece in real time. A pressure gauge and a pressure sensor are connected in parallel beside the flow meter. The pressure gauge is convenient for local observation, and the pressure sensor is convenient for remote observation. The proportional filter 14 can remotely control the flow rate of the hydraulic oil used in the experiment and can also act as a reversing valve to play a reversing role. At the same time, stepless speed regulation function can be achieved when testing the motor. A ball valve is connected in series to each of the two outlets of the proportional filter 14. When performing the cylinder pressure-holding experiment, the ball valve can be closed to reduce the interference caused by leakage at other positions. A pressure gauge and a pressure sensor are connected in parallel behind the ball valve, and multiple branch joints are branched out, facilitating the testing of various working conditions. Each branch joint is connected to a quick-connect joint, facilitating the quick loading and unloading of the oil pipe.

[0026] Furthermore, a constant-pressure variable pump 4 is used as the oil source of the control oil circuit and an overflow valve is connected in parallel; a check valve and a filter are connected in series in sequence at the outlet of the constant-pressure variable pump 4. A safety protection overflow valve is connected in parallel at the pump outlet. A ball valve is connected in series to be used as a spare test interface for the flow valve, and / or a proportional pressure reducing valve is connected in series to remotely adjust the pressure of the hydraulic oil. Furthermore, a reversing valve for switching different control oil circuits of the same component under test is connected in series at the outlet of the proportional pressure reducing valve.

[0027] For the shield machine's hydraulic components, a separate oil circuit is newly added. Since some of the shield machine's hydraulic components not only require the main oil circuit to supply oil, but also need a separate control oil circuit to control them. If the oil is directly drawn from the main oil circuit for control according to the conventional small hydraulic test bench, it will affect the reliability of the test results. To improve the test accuracy and prevent pressure and flow fluctuations, a separate control oil circuit is added to control them. The oil source of the control oil circuit consists of a small constant-pressure variable pump in parallel with a relief valve, which can also reduce the overflow loss and save energy. A check valve and a filter are also connected in series at the pump outlet, and a pressure gauge and a pressure sensor are connected in parallel. In addition, a relief valve is connected in parallel at the pump outlet for safety protection. Then, it is divided into two paths. One path is directly connected to the test port after being connected in series with a ball valve and is used as a standby for the medium-pressure and small-flow valves. The other path is connected in series with a proportional pressure reducing valve to remotely adjust the hydraulic oil pressure. A pressure gauge and a pressure sensor are connected in parallel at the outlet of the proportional pressure reducing valve to detect the adjusted pressure. At the same time, a directional control valve is connected in series for switching between different control oil circuits on the same component under test. The two paths at the outlet of the directional control valve are also respectively connected with quick connectors for the quick loading and unloading of the oil pipes.

[0028] Further, a fixed-displacement pump 7 is used as the oil source for the high-pressure oil circuit. A relief valve for pressure regulation and a solenoid valve for pump loading are connected in parallel at the outlet of the fixed-displacement pump 7. A check valve for preventing the hydraulic oil from flowing back is connected in series at the pump outlet.

[0029] The high-pressure oil circuit is also designed specifically. For the hydraulic cylinders of the shield machine, the pressure of some relief valves can reach 370 bar, and conventional pumps cannot reach this pressure. If a high-pressure pump is directly selected, its function is single. Therefore, a separate high-pressure oil circuit is newly added, which is not used during normal tests and can be started to increase the pressure of the main oil circuit when high pressure is required. The high-pressure oil circuit uses a fixed-displacement pump. A relief valve is connected in parallel at the pump outlet to adjust the pressure, and a solenoid valve is connected in parallel for pump loading. A check valve is connected in series at the pump outlet to prevent the oil from flowing back. A pressure gauge and a pressure sensor are also connected in parallel at the same outlet, and then it is connected with a quick connector for standby. This path increases the oil source pressure during high-pressure tests and is used for a small number of components in the roadheader.

[0030] Further, a fixed-displacement vane pump 11 is used as the oil source for the filter and circulation oil circuit. A filter, an air-cooled radiator 6, and a return oil filter are connected in series in the oil circuit and are connected to the hydraulic oil tank 2.

[0031] The oil source of the filtering and circulating oil circuit adopts a fixed-displacement vane pump. The oil circuit is connected in series with a filter to filter the hydraulic oil in the fuel tank. After filtering, it is connected in series with an air-cooled radiator 6 to cool the hydraulic oil. After cooling, it is connected to the fuel tank through an oil return filter. Due to the relatively poor surrounding environment of the tunnel boring machine, adding this filtering and circulating oil circuit alone can increase the cleanliness of the system and prevent component failures caused by oil pollution. At the same time, because the external circulating water conditions for water cooling are relatively harsh, air cooling is selected here. To increase the continuous use time of the equipment and considering the equipment size, a more suitable air-cooling machine is selected for air cooling.

[0032] Further, the oil source of the waste oil collection oil circuit adopts a micro hydraulic pump, and a filter is connected in series at the outlet of the micro hydraulic pump. The waste oil in the oil circuit is filtered and then sent into the hydraulic oil tank 2.

[0033] Considering that a large amount of waste oil will be generated during the experiment, a waste oil collection device is newly added, and a waste oil collection circuit is also added. The oil source of this circuit adopts a very small hydraulic pump, and a filter is connected in series at the pump outlet. The waste oil is filtered and then pumped back into the fuel tank, which can reduce the waste of hydraulic oil and protect the environment.

[0034] Further, the valve group test oil circuit includes two working oil circuits A and B that are connected to the test platform plug and merged through a hydraulic bridge. The outlet of the hydraulic bridge is sequentially connected with a proportional relief valve, a flow meter, a switching valve, and an oil return filter; the inlet of the hydraulic bridge is connected to the outlet of the filtering and circulating pump through a switching valve.

[0035] The test of the ordinary valve group designs a standard valve test unit. Since hydraulic valves such as directional control valves require two hydraulic oil circuits, and valves such as relief valves and pressure reducing valves only require one hydraulic oil circuit. At the same time, a load needs to be added during the test to observe the oil circuit flow. Therefore, the test unit reserves an oil inlet P port and an oil return T port, and designs two working oil circuits A and B. Each circuit has a pressure gauge and a pressure sensor, and the two circuits are merged through a hydraulic bridge. The outlet of the hydraulic bridge is connected with a proportional relief valve as the load during the test, and a flow meter is connected in series behind to facilitate observing the flow. The outlet of the flow meter is connected to an oil return filter through a switching valve. The inlet of the hydraulic bridge is connected to the outlet of the filtering and circulating pump through a switching valve, which can supply oil when the flow of the component under test is small and the proportional relief valve cannot function.

[0036] Further, the valve group test oil circuit also includes: a test oil circuit for detecting the through-hole series stacking valves of the shield machine, which is connected to the filtering and circulating pump and the test platform plug

[0037] In the embodiment, further considering that there are many 6-way stacked valves on the tunnel boring machine, a test fixture for 6-way stacked valves can be separately added to the test bench to facilitate the testing of 6-way stacked valves. The testing of the motor is carried out by the method of loading two motors in series. Therefore, a motor series connection fixture is machined. For the testing of other valves, a hydraulic bridge is separately designed in series with a proportional overflow valve and a flowmeter. The hydraulic bridge can prevent experimental problems caused by incorrect insertion of the A and B ports. The proportional overflow valve is used for the loading test of some valves, and the flowmeter can detect the flow rate through the device under test. At the same time, a pressure gauge and a pressure sensor are connected in parallel in the circuit to detect the pressure in the circuit.

[0038] As the movable hydraulic test bench in the embodiment of the present invention, further, the frame includes a base 1 and a support frame fixed to one side of the base 1. The control cabinet 3 is arranged on the other side of the base 1. There are pores for forklift handling on the base 1; the base 1 is laid with section steel, and lifting lugs for hoisting are arranged on the section steel.

[0039] See Figure 3 and 4 As shown, for convenient transportation and improved integration of the test bench, the entire test bench adopts an integrated design. The overall length, width and height are 2770×2290×2500. The bottom layer is laid with a frame made of section steel. There is a gap between the side of the frame and the ground to facilitate forklift handling. At the same time, holes are opened in the section steel for convenient hoisting. The main hydraulic pump and the motor are placed on the frame, and the fuel tank is supported on the pump to facilitate the oil suction of the hydraulic pump. The observation hole and the liquid level gauge on the fuel tank are placed on both sides of the fuel tank for easy disassembly and observation; the breather, the return oil filter and the air-cooled cooler are placed on the fuel tank. At the same time, in order to improve the integration, the booster pump and the filter circulation pump are also placed on the upper part of the fuel tank. A leakage collection device and a sewage discharge device are designed at the lower part, which can collect and filter the oil during the test process and discharge the sewage. There are a hydraulic pump and a filter on the device. The recycled oil is filtered and recycled back to the fuel tank to make the oil circulate, reduce the refueling frequency, save resources and reduce pollution. Above is the test platform 15, on which a pressure gauge and a test fixture are placed. The integrated power circuit and control circuit can output 0-10V voltage signals, 0-2.6A current signals, 24V digital signals, all power supplies and the collected signals are integrated on the display screen, and operation control can be performed on the display screen.

[0040] Further, protective plates are also fixed around and on the top of the frame. The protective plate on one side of the control cabinet 3 and the adjacent top protective plate are installed in sliding fit. The entire test bench is enclosed with thin steel plates, which can reduce noise, prevent pollution by water, sundries, etc., and can prevent bumps during transportation.

[0041] As used herein, the term "and / or" can represent three relationships. For example, A and / or B can represent: A exists alone, both A and B exist simultaneously, and B exists alone, these three situations. Additionally, the character " / " herein generally indicates that the related objects before and after are in an "or" relationship.

[0042] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains. The terms "first", "second" and similar terms used in the specification and claims of this application do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not necessarily denote a quantity limitation. The terms "comprising" or "including" and similar terms mean that the elements or items appearing before this term cover the elements or items listed after this term and their equivalents, without excluding other elements or items. The terms "connected" or "coupled" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", etc. are only used to represent relative position relationships, and when the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0043] The exemplary embodiments of the present invention have been described in detail above with reference to the preferred embodiments. However, those skilled in the art can understand that, without departing from the concept of the present invention, various modifications and variations can be made to the above specific embodiments, and various combinations of the technical features and structures proposed by the present invention can be made, without exceeding the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims. The foregoing description of the specific exemplary embodiments of the present invention is not intended to limit the present invention to the precise forms disclosed, and obviously, many changes and variations can be made in accordance with the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can implement and utilize various different exemplary embodiments of the present invention, as well as various different selections and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A movable hydraulic test bench, comprising: a frame, and an experimental device and a control cabinet arranged on the frame, characterized in that, The described experimental device includes: a main hydraulic pump, and a motor, a hydraulic oil tank, and a hydraulic oil circuit connected to the main hydraulic pump; a test platform for testing and detecting the performance of components in the hydraulic oil circuit by connecting to the hydraulic oil circuit through a plug connector is provided on the control cabinet, a display screen for displaying test data of component performance, and a pressure gauge row for testing the pressure data of the hydraulic oil circuit; the hydraulic oil circuit includes a main oil circuit for providing an oil source, a control oil circuit for controlling the oil source, a high-pressure oil circuit for increasing the oil source pressure during high-pressure testing, a filter circulation oil circuit for filtering the hydraulic oil in the hydraulic oil tank, a waste oil collection circuit for recovering the hydraulic oil in each oil circuit, and a valve group test oil circuit for testing each valve in the oil circuit; each oil circuit is respectively connected to the corresponding pressure gauges in the pressure gauge row; the oil source of the main oil circuit uses a constant power pump connected to the plug connector of the test platform, the constant power pump is connected in parallel with a proportional relief valve, and the outlet of the constant power pump is successively connected in series with a check valve, a filter, a flow meter, and a proportional multi-way valve; and a ball valve for cylinder pressure holding test is connected in series at one of the outlets of the proportional multi-way valve; the oil source of the control oil circuit uses a constant pressure variable pump connected to the plug connector of the test platform, the constant pressure variable pump is connected in parallel with a relief valve, and the outlet of the constant pressure variable pump is successively connected in series with a check valve, a filter, and a safety protection relief valve is connected in parallel at the pump outlet, and a ball valve is connected in series to be used as a spare test interface for the flow valve, and / or a proportional pressure reducing valve is connected in series to remotely adjust the hydraulic oil pressure; the outlet of the proportional pressure reducing valve is connected in series with a reversing valve for switching different control oil circuits of the same component to be tested; the oil source of the high-pressure oil circuit uses a fixed-displacement pump connected to the plug connector of the test platform, a pressure regulating relief valve for pressure regulation and a solenoid valve for pump loading are connected in parallel at the outlet of the fixed-displacement pump, and a check valve for preventing the hydraulic oil from flowing back is connected in series at the outlet of the fixed-displacement pump; the oil source of the filter circulation oil circuit uses a fixed-displacement vane pump connected to the plug connector of the test platform, and a filter, an air-cooled radiator, and a return oil filter are successively connected in series in the oil circuit and connected to the hydraulic oil tank; the waste oil collection oil circuit uses a micro hydraulic pump connected to the plug connector of the test platform, and a filter is connected in series at the outlet of the micro hydraulic pump, and the waste oil in the oil circuit is filtered and then sent to the hydraulic oil tank; the valve group test oil circuit includes two working oil circuits, namely, A and B, which are connected to the plug connector of the test platform and merged through a hydraulic bridge, and a test oil circuit for detecting the through-diameter series stacking valves of the shield machine, which is connected to the filter circulation pump and the plug connector of the test platform. The outlet of the hydraulic bridge is successively connected with a proportional relief valve, a flow meter, a switching valve, and a return oil filter; the inlet of the hydraulic bridge is connected to the outlet of the filter circulation pump through a switching valve; the frame includes a base and a support frame fixed to one side of the base, the control cabinet is arranged on the other side of the base, and voids for forklift handling are provided on the base; the base is laid with section steel, and lifting lugs for hoisting are provided on the section steel; protective plates are also fixed around and on the top of the frame, and the protective plate on one side of the control cabinet and the adjacent top protective plate are installed in sliding fit with each other.

Images