A performance test bench for hydraulic system of roadheader

Abstract

The present invention belongs to the field of hydraulic testing of tunnel boring machines, and specifically relates to a tunnel boring machine hydraulic system performance test bench; the test bench comprises a hydraulic power source, a motor loading module, a cylinder loading module, a valve loading module and a pilot control module; the motor loading module is used to test the motor of the tested tunnel boring machine hydraulic system, the cylinder loading module is used to test the cylinder of the tested tunnel boring machine hydraulic system, and the valve loading module is used to test the valve of the tested tunnel boring machine hydraulic system; the hydraulic power source is connected with the tested tunnel boring machine hydraulic system, each loading module and the pilot control module through a pipeline, so as to provide power oil for the entire test bench, and at the same time complete the cooling and filtering of the hydraulic oil used in the test bench; the test bench of the present invention can install, operate and test the hydraulic system of the tunnel boring machine as a whole, breaking through the limitation of the prior art that only hydraulic components can be tested, and can test the performance of the entire hydraulic system of the tunnel boring machine as well as the components, and one test bench has multiple functions.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic testing of tunnel boring machines, and in particular relates to a tunnel boring machine hydraulic system performance test bench. Background Art

[0002] The main actuators of tunneling equipment are driven and controlled by hydraulic systems. The performance of the hydraulic system directly determines the performance of the whole machine. Compared with engineering machinery and other coal mining equipment, the actual working conditions of tunneling machines are the worst. They often work under variable loads and impact loads. The working pressure or flow of the hydraulic system is relatively large (maximum working pressure 32MPa, maximum system flow 700L / min), the actuator action is complex, and frequent speed changes and reversing are required. Under harsh working environments and strict work quality requirements, not only the safety and reliability of the hydraulic system are required, but also strong adaptability and easy control. At present, the hydraulic system of the tunneling machine has problems such as low control accuracy, slow response speed, and poor stability, which cause the actuator action delay, loss of control, poor stability, and high oil temperature of the tunneling machine, which in turn leads to over-excavation, under-excavation, and mechanism damage during the construction of the tunneling working face, resulting in poor engineering quality. At the same time, with the demand for intelligent construction of coal mines, in order to improve safe and efficient mining and achieve the goal of less-manpowered and unmanned operation of the tunneling face, urgent requirements are put forward for the precise control of tunneling equipment and automatic cross-section forming, which in turn puts forward higher requirements on the dynamic performance of the hydraulic system of the tunneling machine.

[0003] The design and application of high-performance hydraulic systems must be supported by a large amount of test data and verified by reliable tests. In the existing technology, the test benches are mainly for hydraulic components. These hydraulic component test benches can only analyze and test hydraulic components such as pumps (motors), valves or cylinders, but cannot test and analyze the overall performance of the hydraulic system of the tunnel boring machine. The existing technology can only perform static loading, and cannot perform dynamic load spectrum loading and apply inertial load according to the actual working conditions of the tunnel boring machine. It cannot effectively simulate the load under actual production conditions (such as cutting, sweeping, walking, loading, climbing, starting, braking, etc.) and common problems (such as impact, overload, stalling, leakage, slipping, machine jam, etc.). The existing technology can only obtain a single static performance, and cannot obtain the dynamic indicators of the hydraulic system of the tunnel boring equipment, such as delay time, rise time, peak time, adjustment time, overshoot, control accuracy, etc. Therefore, it does not have the ability to test, analyze and verify the hydraulic system of the tunnel boring machine under real working conditions and load environments.

[0004] In summary, in order to make the hydraulic system of the tunnel boring machine meet the operating requirements under complex working conditions, it is necessary to develop a tunnel boring machine hydraulic system performance analysis test bench, which can apply dynamic loads simulating actual working conditions to it, obtain performance parameters and dynamic curves, and ensure the reasonable matching of the tunnel boring machine's cutting ability, traction ability, driving ability and the whole machine control system, so as to provide technical guarantee for improving the comprehensive performance and intelligence level of the tunnel boring machine. Summary of the invention

[0005] The technical problem to be solved by the present invention is that currently only the components of the hydraulic system of the tunnel boring machine can be tested, but the overall performance of the hydraulic system cannot be tested, and dynamic loads and inertial loads cannot be applied to the hydraulic system according to the actual production conditions of the tunnel boring machine.

[0006] The present invention provides the following technical solutions: a tunnel boring machine hydraulic system performance test bench, comprising a hydraulic power source, a motor loading module, a cylinder loading module, a valve loading module and a pilot control module;

[0007] The motor loading module is used to test the motor of the hydraulic system of the tested tunnel boring machine, the cylinder loading module is used to test the cylinder of the hydraulic system of the tested tunnel boring machine, and the valve loading module is used to test the valve of the hydraulic system of the tested tunnel boring machine;

[0008] The hydraulic power source includes a main oil tank, a roadheader oil supply circuit, a motor loading oil supply circuit, a cylinder loading oil supply circuit, a pilot control oil supply circuit, and a circulating cooling circuit;

[0009] The hydraulic power source is connected to the hydraulic system of the tested tunnel boring machine, each loading module, and the pilot control module through pipelines to provide power oil for the entire test bench and complete the cooling and filtering of the hydraulic oil used in the test bench;

[0010] Among them, the oil suction port of the tunnel boring machine oil supply circuit is connected to the main oil tank, and the oil outlet is connected to the valve loading module; the oil suction port of the motor loading oil supply circuit is connected to the main oil tank, and the oil outlet is connected to the motor loading module; the oil suction port of the cylinder loading oil supply circuit is connected to the main oil tank, and the oil outlet is connected to the cylinder loading module; the oil suction port of the pilot control oil supply circuit is connected to the main oil tank, and the oil outlet is connected to the pilot control module; the oil inlet of the circulating cooling circuit is connected to the low-level oil port of the main oil tank, and the oil outlet is connected to the high-level oil port of the main oil tank, completing the circulating cooling and filtration of the oil.

[0011] Further, the motor loading module includes a plurality of parallel motor loading circuits, and the motor loading circuit includes a loading motor, a torque speed sensor, an inertial loading flywheel, a first bridge rectifier circuit, a proportional relief valve and a tested motor;

[0012] The output shaft of the tested motor is connected to the output shaft of the loading motor through a mechanical structure for transmitting loading power; the torque and speed sensor is arranged between the tested motor and the loading motor for detecting the change of loading torque during the test; the inertial loading flywheel is arranged between the torque and speed sensor and the tested motor for applying an inertial load to the tested motor; the two working oil ports of the loading motor are connected to the oil outlet of the motor loading oil supply circuit and the oil return port of the main oil tank through the first bridge rectifier circuit, and the first electromagnetic proportional relief valve is arranged on the pipeline between the first bridge rectifier circuit and the motor loading oil supply circuit, and the dynamic loading of the tested motor is realized by dynamically controlling the pressure of the first electromagnetic proportional relief valve; the tested motor is connected to the control valve of the hydraulic system of the tested tunnel boring machine.

[0013] Further, the cylinder loading module includes a plurality of parallel cylinder loading circuits;

[0014] The cylinder loading circuit includes a loading cylinder, a displacement sensor, a force sensor, an inertial mass load, an electromagnetic proportional reversing valve, an accumulator group and a tested cylinder;

[0015] The piston rod of the tested cylinder is connected to the piston rod of the loading cylinder by a mechanical structure for transmitting the loading power. The displacement sensor and the force sensor are arranged on the loading cylinder side for detecting the displacement and force changes of the loading cylinder during the test. The inertial mass load is arranged between the loading cylinder and the tested cylinder for applying the inertial load to the tested cylinder. The two working oil ports of the loading cylinder are connected to the oil outlet of the cylinder loading oil supply circuit and the oil return port of the main oil tank through the electromagnetic proportional reversing valve, and the dynamic load loading of the tested cylinder is completed by dynamically controlling the valve core opening size of the electromagnetic proportional reversing valve. The accumulator group is arranged on the bypass of the oil inlet pipeline of the electromagnetic proportional reversing valve for rapid response of the pressure oil to the dynamic load change. The tested cylinder is connected to the control valve of the hydraulic system of the tested tunnel boring machine.

[0016] Further, the valve loading module includes a multi-way reversing valve of the tunnel boring machine, an auxiliary control circuit and a valve loading circuit;

[0017] The oil inlet of the tunnel boring machine multi-way reversing valve is connected to the oil outlet of the tunnel boring machine oil supply circuit, and the oil outlet is connected to the working oil port of the tunnel boring machine actuator in the hydraulic system of the tested tunnel boring machine, and the tunnel boring machine actuator includes a tested motor and a tested oil cylinder;

[0018] The auxiliary control circuit includes a balancing valve and a first relief valve, which are used for auxiliary control of the pressure of the tunnel boring machine actuator; the valve loading circuit includes a second electromagnetic proportional relief valve and a second bridge rectifier circuit, which are used for separate loading test of the tunnel boring machine multi-way reversing valve; the valve loading circuit is connected to the oil outlet of the pilot control module and the oil return port of the main oil tank through the second bridge rectifier circuit and the second electromagnetic proportional relief valve; dynamic loading of the tunnel boring machine multi-way reversing valve is achieved by dynamically controlling the pressure of the second electromagnetic proportional relief valve.

[0019] Furthermore, the pilot control module includes an electromagnetic reversing valve, an electric proportional pressure reducing valve group, and a second relief valve; the oil inlet and oil return port of the second relief valve are respectively connected to the oil inlet of the pilot control oil supply circuit and the oil return port of the main oil tank, and the working oil port is connected to the control oil port of the tunnel boring machine multi-way reversing valve and the tunnel boring machine variable motor; proportional control of the output pilot oil pressure is completed through the electromagnetic reversing valve and the electric proportional pressure reducing valve group.

[0020] Furthermore, the hydraulic power source also includes a residual oil recovery circuit and an oil collecting tank. The oil inlet of the residual oil recovery circuit is connected to the oil collecting tank, and the oil outlet is connected to the main oil tank. The leaked oil during the test is filtered by an oil pump and recovered to the main oil tank for reuse.

[0021] Furthermore, the motor loading module includes four parallel motor loading circuits, namely a left travel motor loading circuit, a right travel motor loading circuit, a transport motor loading circuit, and a loading motor loading circuit.

[0022] Furthermore, the cylinder loading module includes two parallel cylinder loading circuits, namely a lifting cylinder loading circuit and a rotating cylinder loading circuit.

[0023] Furthermore, the test bench is provided with flow sensors in the main circuit, the load circuit, and the control circuit, and during the test, the flow sensors collect and record the flow parameter changes of each circuit;

[0024] The test bench is equipped with pressure sensors in the main circuit, load circuit and control circuit. During the test, the pressure sensors monitor the changes in pressure parameters in real time.

[0025] Furthermore, the test bench is equipped with filters in the oil suction line, high-pressure line and oil return line to filter the system oil in multiple stages;

[0026] The test bench is equipped with oil quality monitors in the main oil tank and pipelines to monitor the oil quality in real time during the test.

[0027] Compared with the prior art, the advantages of the present invention are:

[0028] 1. The test bench of the present invention can install, operate and test the hydraulic system of the tunnel boring machine as a whole, breaking through the limitation of the prior art that only hydraulic components can be tested. It can test the performance of the entire hydraulic system of the tunnel boring machine as well as the components. A test bench has multiple functions, which can better and more finely verify the performance of the hydraulic system of the tunnel boring machine, and provide detailed and accurate experimental data for system design and improvement.

[0029] 2. The test bench of the present invention can apply dynamic loads and inertial loads to the hydraulic system of the tunnel boring machine, and input the load spectrum according to the actual working conditions, breaking through the limitation of the prior art that only static loads can be applied. It can more realistically reflect the load changes of the tunnel boring machine during the actual construction process, and effectively simulate the loads under actual production conditions (such as cutting, bottom sweeping, walking, loading, climbing, starting, braking, etc.) and common problems (such as impact, overload, jamming, leakage, slipping, machine jam, etc.), making the test bench test data more instructive.

[0030] 3. The key components of the test bench of the present invention are all solenoid valves. During the test, the input of control signals and loading signals can be input through the electrical centralized control platform, which is simple and reliable to operate. The test bench is equipped with a variety of high-precision sensors to realize real-time dynamic monitoring and recording of various parameters such as pressure, flow, speed, torque, displacement, force, temperature, etc., and can obtain the dynamic indicators of the hydraulic system of the tunneling equipment under various working conditions, such as delay time, rise time, peak time, adjustment time, overshoot, control accuracy, etc., and finally analyze and verify the stability, accuracy, rapidity, safety and other performance of the hydraulic system of the tunneling equipment.

[0031] 4. The test bench adopts modular design, which can easily and quickly replace the tested system or components. The test range can cover the current common and serialized hydraulic systems of tunnel boring machines, and reserve 30% of the detection capacity. The test bench is equipped with a cooling system and residual oil recovery system to ensure safe and environmentally friendly operation during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the hydraulic system principle of the test bench of the present invention;

[0033] Figure 2 Schematic diagram of the hydraulic system for the motor loading module;

[0034] Figure 3 Schematic diagram of the hydraulic system principle of the cylinder loading module.

[0035] In the figure: 100-hydraulic power source; 101-main oil tank; 102-roadheader oil supply circuit; 103-motor loading oil supply circuit; 104-cylinder loading oil supply circuit; 105-pilot control oil supply circuit; 106-circulating cooling circuit; 107-residual oil recovery circuit;

[0036] 200-motor loading module; 201-left travel motor loading circuit; 202-right travel motor loading circuit; 203-transport motor loading circuit; 204-loading motor loading circuit; 201.1-loading motor; 201.2 torque speed sensor; 201.3-inertial loading flywheel; 201.4-first bridge rectifier circuit; 201.5-first electromagnetic proportional overflow valve; 201.6-tested motor;

[0037] 300-Cylinder loading module; 301-Lifting cylinder loading circuit; 302-Slewing cylinder loading circuit; 301.1-Loading cylinder; 301.2-Displacement sensor; 301.3-Force sensor; 301.4-Inertial mass load; 301.5-Electromagnetic proportional reversing valve; 301.6-Accumulator group; 301.7-Tested cylinder;

[0038] 400-valve loading module; 401-tunneling machine multi-way reversing valve; 402-auxiliary control circuit; 403-valve loading circuit;

[0039] 500-pilot control module; 501-electric proportional pressure reducing valve group. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] like Figure 1 As shown: a tunnel boring machine hydraulic system performance test bench, including a hydraulic power source 100, a motor loading module 200, a cylinder loading module 300, a valve loading module 400 and a pilot control module 500.

[0042] The motor loading module 200 is used to test the motor of the hydraulic system of the tested tunnel boring machine, the cylinder loading module 300 is used to test the cylinder of the hydraulic system of the tested tunnel boring machine, and the valve loading module 400 is used to test the valve of the hydraulic system of the tested tunnel boring machine.

[0043] The hydraulic power source 100 includes a main oil tank 101, a tunnel boring machine oil supply circuit 102, a motor loading oil supply circuit 103, a cylinder loading oil supply circuit 104, a pilot control oil supply circuit 105, a circulating cooling circuit 106 and a residual oil recovery circuit 107; the hydraulic power source 100 is provided with a plurality of independent power source circuits, which can supply oil independently or in combination, to ensure sufficient power during the system test and reduce mutual influence between the circuits.

[0044] The hydraulic power source 100 is connected to the hydraulic system of the tested tunnel boring machine, various loading modules, and the pilot control module 500 through pipelines to provide power oil for the entire test bench, and at the same time completes the cooling, filtering, recovery, and monitoring of the hydraulic oil used in the test bench.

[0045] Among them, the oil suction port of the tunnel boring machine oil supply circuit 102 is connected to the main oil tank 101, and the oil outlet is connected to the valve loading module 400; the oil suction port of the motor loading oil supply circuit 103 is connected to the main oil tank 101, and the oil outlet is connected to the motor loading module 200; the oil suction port of the cylinder loading oil supply circuit 104 is connected to the main oil tank 101, and the oil outlet is connected to the cylinder loading module 300; the oil suction port of the pilot control oil supply circuit 105 is connected to the main oil tank 101, and the oil outlet is connected to the pilot control module 500; the oil inlet of the circulating cooling circuit 106 is connected to the low-level oil port of the main oil tank 101, and the oil outlet is connected to the high-level oil port of the main oil tank 101, so as to complete the circulating cooling and filtration of the oil; the oil inlet of the residual oil recovery circuit 107 is connected to the oil collecting tank, and the oil outlet is connected to the main oil tank 101. The leaked oil during the test is filtered by the oil pump and recovered to the main oil tank 101 for reuse to avoid polluting the environment.

[0046] like Figure 2 As shown: the motor loading module 200 includes several parallel motor loading circuits, and the motor loading circuit applies a certain simulated load to the actuator motor of the tunnel boring machine according to the actual working conditions. The motor loading circuit includes a loading motor 201.1, a torque and speed sensor 201.2, an inertial loading flywheel 201.3, a first bridge rectifier circuit 201.4, a proportional relief valve 201.5 and a test motor 201.6.

[0047] The output shaft of the tested motor 201.6 is connected to the output shaft of the loading motor 201.1 through a mechanical structure to form a "drag-to-drag" form for transmitting loading power. The tested motor 201.6 can be replaced according to the different structures of the tunnel boring machine; the torque speed sensor 201.2 is arranged between the tested motor 201.6 and the loading motor 201.1 to detect the change of loading torque during the test; the inertial loading flywheel 201.3 is arranged between the torque speed sensor 201.2 and the tested motor 201.6 to apply an inertial load to the tested motor 201.6. The inertial loading flywheel 201.3 can be arranged according to the specific tunnel boring machine structure. The flywheel is used to increase or decrease the rotational inertia of the motor under test; the two working oil ports of the loading motor 201.1 are connected to the oil outlet of the motor loading oil supply circuit 103 and the oil return port of the main oil tank 101 through the first bridge rectifier circuit 201.4; a first electromagnetic proportional relief valve 201.5 is arranged on the pipeline between the first bridge rectifier circuit 201.4 and the motor loading oil supply circuit 103; the dynamic loading of the test motor 201.6 is realized by dynamically controlling the pressure of the first electromagnetic proportional relief valve 201.5; the test motor 201.6 is connected to the control valve of the hydraulic system of the test tunneling machine.

[0048] The tested motor 201.6 of the hydraulic system of the tunnel boring machine is dynamically loaded through the first electromagnetic proportional relief valve 201.5 and the first bridge rectifier circuit 201.4. The tested motor 201.6 can be loaded and tested according to the load changes of the tunnel boring machine under actual production conditions.

[0049] The motor loading module 200 includes four parallel motor loading circuits, namely a left travel motor loading circuit 201 , a right travel motor loading circuit 202 , a transport motor loading circuit 203 , and a loading motor loading circuit 204 .

[0050] like Figure 3 As shown: the cylinder loading module 300 includes a plurality of parallel cylinder loading circuits, and the cylinder loading circuits are used to apply a certain simulated load to the execution cylinder of the tunnel boring machine according to the actual working conditions.

[0051] The cylinder loading circuit includes a loading cylinder 301.1, a displacement sensor 301.2, a force sensor 301.3, an inertial mass load 301.4, an electromagnetic proportional reversing valve 301.5, an accumulator group 301.6 and a tested cylinder 301.7;

[0052] The piston rod of the tested cylinder 301.7 is connected to the piston rod of the loading cylinder 301.1 by a mechanical structure to form a "top-to-top" form for transmitting loading power. The tested cylinder can be replaced according to the different structures of the tunnel boring machine; the displacement sensor 301.2 and the force sensor 301.3 are arranged on the side of the loading cylinder 301.1 to detect the displacement and force changes of the loading cylinder 301.1 during the test; the inertial mass load 301.4 is arranged between the loading cylinder 301.1 and the tested cylinder 301.7 to apply an inertial load to the tested cylinder 301.7. The inertial mass load 301.4 can be adjusted according to the specific structure of the tested cylinder 301.7. The inertia size of the cylinder increases or decreases the inertia mass; the two working oil ports of the loading cylinder 301.1 are connected to the oil outlet of the cylinder loading oil supply circuit 104 and the oil return port of the main oil tank 101 through the electromagnetic proportional reversing valve 301.5, and the dynamic load loading of the tested cylinder 301.7 is completed by dynamically controlling the valve core opening size of the electromagnetic proportional reversing valve 301.5; the accumulator group 301.6 is arranged on the bypass of the oil inlet pipeline of the electromagnetic proportional reversing valve 301.5, and is used for the rapid response of the pressure oil when the dynamic load changes rapidly; the tested cylinder 301.7 is connected to the control valve of the hydraulic system of the tested tunnel boring machine.

[0053] The cylinder loading module 300 includes two parallel cylinder loading circuits, namely a lifting cylinder loading circuit 301 and a rotating cylinder loading circuit 302 .

[0054] The valve loading module 400 includes a tunnel boring machine multi-way reversing valve 401 , an auxiliary control circuit 402 and a valve loading circuit 403 .

[0055] The oil inlet of the tunnel boring machine multi-way reversing valve 401 is connected to the oil outlet of the tunnel boring machine oil supply circuit 102, and the oil outlet is connected to the working oil port of the tunnel boring machine actuator in the hydraulic system of the tested tunnel boring machine. The tunnel boring machine actuator includes a tested motor 201.6 and a tested cylinder 301.7; the control of the direction and pressure of the tunnel boring machine actuator is realized, and the multi-way reversing valve can be replaced according to the different structures of the tunnel boring machine.

[0056] The auxiliary control circuit 402 includes a balancing valve and a first relief valve, which are used for auxiliary control of the pressure of the actuator of the tunnel boring machine, truly simulating the structural characteristics of the tunnel boring machine; the valve loading circuit 403 includes a second electromagnetic proportional relief valve and a second bridge rectifier circuit, which are used to perform a separate loading test on the tunnel boring machine multi-way reversing valve 401; the valve loading circuit 403 is connected to the oil outlet of the pilot control module 500 and the oil return port of the main oil tank 101 through the second bridge rectifier circuit and the second electromagnetic proportional relief valve; the dynamic loading of the tunnel boring machine multi-way reversing valve 401 is achieved by dynamically controlling the pressure of the second electromagnetic proportional relief valve.

[0057] The pilot control module 500 includes an electromagnetic reversing valve, an electric proportional pressure reducing valve group 501, and a second relief valve; the oil inlet and oil return port of the second relief valve are respectively connected to the oil inlet of the pilot control oil supply circuit 105 and the oil return port of the main oil tank 101, and the working oil port is connected to the control oil port of the tunnel boring machine multi-way reversing valve 401 and the variable motor of the tunnel boring machine; the proportional control of the output pilot oil pressure is completed through the electromagnetic reversing valve and the electric proportional pressure reducing valve group 501, and accurate and dynamically variable pilot control pressure is provided according to actual control needs.

[0058] The hydraulic pilot signal is controlled by the electric proportional pressure reducing valve group 501 to realize independent proportional control of multiple pilot signals. The tunnel boring machine multi-way reversing valve 401 is loaded by the second electromagnetic proportional relief valve and the second bridge rectifier circuit, and the load can be dynamically controlled in proportion.

[0059] The pump, valve, motor and cylinder of the hydraulic system of the tested tunnel boring machine are respectively installed in the hydraulic power source 100, the valve loading module 400, the motor loading module 200 and the cylinder loading module 300, and are connected through pipelines to realize the operation and testing of the entire tunnel boring machine hydraulic system on the test bench.

[0060] The test bench is equipped with quick-connect connectors and ball valves at all pipe connections involving replacement of components in the hydraulic system of the tested tunnel boring machine to facilitate replacement and ensure safety.

[0061] The test bench adopts circulating water cooling, and the cooling water enters the plate cooler of the hydraulic power source 100 to cool the heat generated by the system.

[0062] The test bench is equipped with flow sensors in the main circuit, load circuit and control circuit, which can collect and record the flow parameter changes of each circuit in real time during the test.

[0063] The test bench is equipped with pressure sensors in the main circuit, load circuit and control circuit, and multiple pressure measuring points are set at necessary positions. During the test, the pressure parameter changes can be monitored in real time through the test bench's own pressure sensors, and can also be verified through external test instruments.

[0064] The test bench is equipped with filters in the oil suction pipeline, high-pressure pipeline and oil return pipeline to filter the system oil in multiple stages. The filter is equipped with a pollution alarm device to remind you to replace the filter element when it is contaminated and blocked.

[0065] The test bench is equipped with oil quality monitors in the main oil tank and pipelines, and multiple oil sampling points are also set up. During the test, the oil quality can be monitored in real time, and samples can be taken and tested through external instruments.

[0066] When used for testing the hydraulic system of a tunnel boring machine, the multi-pump of the tunnel boring machine under test is installed in the hydraulic power source 100 module of the test bench, the tunnel boring multi-way reversing valve 401 is installed in the valve loading module 400, the left travel motor, right travel motor, transport motor and loading motor of the tunnel boring machine are respectively installed in the corresponding circuits of the motor loading module 200, and the cutting and lifting cylinder and cutting and rotating cylinder of the tunnel boring machine are respectively installed in the corresponding circuits of the cylinder loading module 300. The pressure oil port and load sensing port of the tunnel boring machine multi-pump are connected to the corresponding P port and LS port of the tunnel boring machine multi-way reversing valve 401, the T port of the tunnel boring machine multi-way reversing valve 401 is connected to the return oil port of the main oil tank 101, the pilot control oil port of the tunnel boring machine multi-way reversing valve 401 is connected to the working oil port of the pilot control module 500, and the A and B ports of the tunnel boring machine multi-way reversing valve 401 are connected to the corresponding working oil ports of the motor and cylinder. At this point, the entire hydraulic system of the tunnel boring machine under test is installed on the test bench.

[0067] Start the motor of the tunnel boring machine oil supply circuit 102 and the motor of the pilot control oil supply circuit 105 in the power source of the test bench to drive the tunnel boring machine multi-pump to operate. The high-pressure hydraulic oil controls the movement of the tunnel boring machine actuator (motor and cylinder). The pilot signal of the electric proportional pressure reducing valve group 501 controls the movement direction of the valve core and the adjustment opening size of the tunnel boring machine multi-way reversing valve 401, thereby controlling the movement direction and speed of the actuator. The proportional relief valve at the outlet of the multi-pump can adjust the outlet pressure of each pump. By controlling the electrical signal of the electric proportional pressure reducing valve group 501, the pilot pressure ratio of each tunnel boring machine multi-way reversing valve 401 can be adjusted.

[0068] Start the motors of the cylinder loading oil supply circuit 104 and the motor loading oil supply circuit 103 in the hydraulic power source to drive the pump to provide pressure oil for the loading motor 201.1 and the loading cylinder 301.1. The signal of the first electromagnetic proportional relief valve 201.5 in the motor loading module 200 is controlled by the electrical control module to control the back pressure of the loading motor 201.1, thereby realizing dynamic control of the loading torque of the tunnel boring machine motor; the control signal of the electromagnetic proportional reversing valve 301.5 in the cylinder loading module 300 is controlled by the electrical control module to control the back pressure of the loading cylinder 301.1, thereby realizing dynamic control of the loading force of the tunnel boring machine cylinder.

[0069] The flywheel is increased or decreased according to the rotational inertia of the tested tunnel boring machine to realize the loading of the motor inertia load; the inertia mass load is increased or decreased according to the inertia of the tested tunnel boring machine to realize the loading of the cylinder inertia load.

[0070] The hydraulic system of the tunnel boring machine is tested under the above dynamic load and inertial load to simulate the real working conditions. During the test, the signal acquisition and analysis system records and analyzes the pressure, flow, force, torque, displacement, speed, temperature and other parameters collected by the sensor in real time to determine the performance of the hydraulic system of the tunnel boring machine.

[0071] During the test, the motor of the circulating cooling circuit in the hydraulic power source needs to be started to circulate and cool the oil.

[0072] This test bench can also be used for independent testing of commonly used motors of tunnel boring machines. The test motor 201.6 is installed at the test motor position in the motor loading module 200, and the test bench's built-in multi-pump and multi-way reversing valve are used for drive control. The motor loading test can be achieved by following the steps for loading the motor in the tunnel boring machine hydraulic system test.

[0073] This test bench can also be used for independent testing of commonly used cylinders of roadheaders. The test cylinder 301.7 is installed at the test cylinder position in the cylinder loading module 300, and the test bench's built-in multi-pump and multi-way reversing valve are used for drive control. The cylinder loading test can be achieved by following the steps for loading the cylinder in the hydraulic system test of the roadheader.

[0074] This test bench can also be used for independent testing of commonly used multi-pumps in roadheaders. The pump under test is installed in the multi-pump position in the hydraulic power source, and the multi-way reversing valve and actuator provided by the test bench are used to perform loading tests according to the steps in the hydraulic system test of the roadheader.

[0075] This test bench can also be used for independent testing of multi-way directional valves commonly used in tunnel boring machines. The multi-way directional valve to be tested is installed at the position of the multi-way valve to be tested in the valve test module. The multi-pump provided by the test bench is used to provide oil power. The working oil port of the valve loading circuit in the valve loading module is connected to the A and B ports of the multi-way directional valve. The signal of the electromagnetic proportional relief valve in the control valve loading circuit is used to realize the loading test of the A or B port of the multi-way directional valve. During the test, the flow and pressure sensors in the valve loading circuit are used to monitor the parameter changes.

[0076] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tunnel boring machine hydraulic system performance test bench, characterized by: It comprises a hydraulic power source (100), a motor loading module (200), a cylinder loading module (300), a valve loading module (400) and a pilot control module (500); The motor loading module (200) is used to test the motor of the hydraulic system of the tested tunnel boring machine, the cylinder loading module (300) is used to test the cylinder of the hydraulic system of the tested tunnel boring machine, and the valve loading module (400) is used to test the valve of the hydraulic system of the tested tunnel boring machine; The hydraulic power source (100) comprises a main oil tank (101), a roadheader oil supply circuit (102), a motor loading oil supply circuit (103), a cylinder loading oil supply circuit (104), a pilot control oil supply circuit (105) and a circulating cooling circuit (106); The hydraulic power source (100) is connected to the hydraulic system of the tested tunnel boring machine, various loading modules, and the pilot control module (500) through pipelines to provide power oil for the entire test bench and simultaneously complete the cooling and filtering of the hydraulic oil used in the test bench; The oil suction port of the tunnel boring machine oil supply circuit (102) is connected to the main oil tank (101), and the oil outlet is connected to the valve loading module (400); the oil suction port of the motor loading oil supply circuit (103) is connected to the main oil tank (101), and the oil outlet is connected to the motor loading module (200); the oil suction port of the cylinder loading oil supply circuit (104) is connected to the main oil tank (101), and the oil outlet is connected to the cylinder loading module (300); the oil suction port of the pilot control oil supply circuit (105) is connected to the main oil tank (101), and the oil outlet is connected to the pilot control module (500); the oil inlet of the circulating cooling circuit (106) is connected to the low-level oil port of the main oil tank (101), and the oil outlet is connected to the high-level oil port of the main oil tank (101), so as to complete the circulating cooling and filtering of the oil; The motor loading module (200) comprises a plurality of parallel motor loading circuits, wherein the motor loading circuit comprises a loading motor (201.1), a torque speed sensor (201.2), an inertial loading flywheel (201.3), a first bridge rectifier circuit (201.4), a proportional relief valve (201.5) and a tested motor (201.6); The output shaft of the tested motor (201.6) is connected to the output shaft of the loading motor (201.1) through a mechanical structure for transmitting loading power; the torque speed sensor (201.2) is arranged between the tested motor (201.6) and the loading motor (201.1) for detecting changes in loading torque during the test; the inertial loading flywheel (201.3) is arranged between the torque speed sensor (201.2) and the tested motor (201.6) for applying an inertial load to the tested motor (201.6); The two working oil ports are connected to the oil outlet of the motor loading oil supply circuit (103) and the oil return port of the main oil tank (101) through the first bridge rectifier circuit (201.4); a first electromagnetic proportional relief valve (201.5) is arranged on the pipeline between the first bridge rectifier circuit (201.4) and the motor loading oil supply circuit (103); and dynamic loading of the tested motor (201.6) is achieved by dynamically controlling the pressure of the first electromagnetic proportional relief valve (201.5); the tested motor (201.6) is connected to the control valve of the hydraulic system of the tested tunnel boring machine; The oil cylinder loading module (300) comprises a plurality of parallel oil cylinder loading circuits; The oil cylinder loading circuit includes a loading oil cylinder (301.1), a displacement sensor (301.2), a force sensor (301.3), an inertial mass load (301.4), an electromagnetic proportional reversing valve (301.5), an accumulator group (301.6) and a tested oil cylinder (301.7); The piston rod of the tested oil cylinder (301.7) and the piston rod of the loading oil cylinder (301.1) are connected by a mechanical structure for transmitting loading power; the displacement sensor (301.2) and the force sensor (301.3) are arranged on the side of the loading oil cylinder (301.1) for detecting the displacement and force changes of the loading oil cylinder (301.1) during the test; the inertial mass load (301.4) is arranged between the loading oil cylinder (301.1) and the tested oil cylinder (301.7) for applying an inertial load to the tested oil cylinder (301.7); the loading oil cylinder (301.1 ) are connected to the oil outlet of the cylinder loading oil supply circuit (104) and the oil return port of the main oil tank (101) through the electromagnetic proportional reversing valve (301.5), and the dynamic load loading of the tested cylinder (301.7) is completed by dynamically controlling the valve core opening size of the electromagnetic proportional reversing valve (301.5); the accumulator group (301.6) is arranged on the bypass of the oil inlet pipeline of the electromagnetic proportional reversing valve (301.5) to quickly respond to the pressure oil changes with the dynamic load; the tested cylinder (301.7) is connected to the control valve of the hydraulic system of the tested tunnel boring machine.

2. A tunnel boring machine hydraulic system performance test bench according to claim 1, characterized in that: The valve loading module (400) comprises a tunnel boring machine multi-way reversing valve (401), an auxiliary control circuit (402) and a valve loading circuit (403); The oil inlet of the tunnel boring machine multi-way reversing valve (401) is connected to the oil outlet of the tunnel boring machine oil supply circuit (102), and the oil outlet is connected to the working oil port of the tunnel boring machine actuator in the tunnel boring machine hydraulic system under test, wherein the tunnel boring machine actuator comprises a tested motor (201.6) and a tested oil cylinder (301.7); The auxiliary control circuit (402) includes a balancing valve and a first overflow valve for auxiliary control of the pressure of the actuator of the tunnel boring machine; the valve loading circuit (403) includes a second electromagnetic proportional overflow valve and a second bridge rectifier circuit for performing a separate loading test on the tunnel boring machine multi-way reversing valve (401); the valve loading circuit (403) is connected to the oil outlet of the pilot control module (500) and the oil return port of the main oil tank (101) through the second bridge rectifier circuit and the second electromagnetic proportional overflow valve; and the dynamic loading of the tunnel boring machine multi-way reversing valve (401) is achieved by dynamically controlling the pressure of the second electromagnetic proportional overflow valve.

3. A tunnel boring machine hydraulic system performance test bench according to claim 2, characterized in that: The pilot control module (500) comprises an electromagnetic reversing valve, an electric proportional pressure reducing valve group (501), and a second relief valve; the oil inlet and oil return port of the second relief valve are respectively connected to the oil inlet of the pilot control oil supply circuit (105) and the oil return port of the main oil tank (101), and the working oil port is connected to the multi-way reversing valve (401) of the tunnel boring machine and the control oil port of the variable motor of the tunnel boring machine; the proportional control of the output pilot oil pressure is completed by the electromagnetic reversing valve and the electric proportional pressure reducing valve group (501).

4. The tunnel boring machine hydraulic system performance test bench according to claim 1, characterized in that: The hydraulic power source (100) further comprises a residual oil recovery circuit (107) and an oil collecting tank. The oil inlet of the residual oil recovery circuit (107) is connected to the oil collecting tank, and the oil outlet is connected to the main oil tank (101). The leaked oil during the test is filtered by an oil pump and recovered to the main oil tank (101) for reuse.

5. The tunnel boring machine hydraulic system performance test bench according to claim 1, characterized in that: The motor loading module (200) comprises four parallel motor loading circuits, namely a left travel motor loading circuit (201), a right travel motor loading circuit (202), a transport motor loading circuit (203), and a loading motor loading circuit (204).

6. The tunnel boring machine hydraulic system performance test bench according to claim 1, characterized in that: The oil cylinder loading module (300) comprises two parallel oil cylinder loading circuits, namely a lifting oil cylinder loading circuit (301) and a rotating oil cylinder loading circuit (302).

7. The tunnel boring machine hydraulic system performance test bench according to claim 1, characterized in that: The test bench is provided with flow sensors in the main circuit, the load circuit and the control circuit. During the test, the flow sensors collect and record the flow parameter changes of each circuit; The test bench is equipped with pressure sensors in the main circuit, load circuit and control circuit. During the test, the pressure sensors monitor the changes in pressure parameters in real time.

8. The tunnel boring machine hydraulic system performance test bench according to claim 7, characterized in that: The test bench is provided with filters in the oil suction pipeline, the high-pressure pipeline and the oil return pipeline to filter the system oil in multiple stages; The test bench is provided with oil quality monitors in the main oil tank (101) and the pipelines to monitor the oil quality in real time during the test.

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