A coal machine equipment hydraulic rubber pipe performance test system and test method

Abstract

The application discloses a coal machine equipment hydraulic rubber pipe performance test system and a test method, and relates to the technical field of coal machine equipment testing. The test system comprises a rubber pipe test system mounting rack for fixing and supporting a hydraulic rubber pipe test piece; a hydraulic system in communication with the hydraulic rubber pipe test piece is arranged in the rubber pipe test system mounting rack; the rubber pipe test system mounting rack is connected with a multi-degree-of-freedom displacement loading table and a multi-degree-of-freedom vibration loading table; a test data sensing system is connected to the hydraulic rubber pipe test piece and the hydraulic system; the test data sensing system is connected with a measurement and control system acquisition board card assembly; and a controller of the measurement and control system acquisition board card assembly is connected with the multi-degree-of-freedom vibration loading table through a power amplifier. The test system and the test method based on the test system can simulate the complex working environment of the hydraulic rubber pipe of the coal machine, and thus the performance of the rubber pipe under complex superimposed loads can be tested.

Description

Technical Field

[0001] This invention relates to the technical field of coal mining equipment testing, and in particular to a performance testing system and method for hydraulic hoses of coal mining equipment. Background Technology

[0002] Hydraulic hoses are widely used in the hydraulic piping systems of coal mining equipment due to their excellent performance. As the "blood vessels" of the hydraulic system and the "link" of the control circuit, their performance directly affects the safety and reliability of the entire hydraulic piping system. Coal mining equipment has a complex mechanical structure, high integration, and limited internal assembly space. Furthermore, it faces harsh extreme working environments such as high temperature, high pressure, strong fluid impact, and strong vibration. This results in hydraulic hoses being subjected to multiple coupled loads during operation, leading to frequent failures with complex failure mechanisms. Therefore, exploring the performance of hydraulic hoses in coal mining equipment under superimposed multi-load conditions is of great significance for improving the reliability and service life of both the hoses and the coal mining equipment.

[0003] Because experiments can directly reveal the superimposed loads on hydraulic hoses of coal mining equipment under different operating conditions, they have become an important means of studying hose performance. However, due to the special nature of the working environment, testing the performance of hydraulic hoses in coal mining equipment is quite difficult, characterized by special fluid characteristics, complex hose spatial layout, difficulty in load reproduction, and the need for collecting and transmitting a large amount of experimental data. Therefore, a comprehensive testing system to fully reproduce the special working environment of hydraulic pipelines in coal mining equipment and the superimposed loads they bear under complex operating conditions is a prerequisite for ensuring the accuracy and reliability of research results. The corresponding testing methods further guarantee the implementation of complex load conditions and the processing of complex experimental data.

[0004] Currently, there are very few testing systems capable of simulating the complex working environment of hydraulic hoses in coal mining machinery, and there are almost no systems or methods capable of accurately testing the performance of hoses under complex superimposed loads. Summary of the Invention

[0005] The purpose of this invention is to provide a performance testing system and method for hydraulic hoses in coal mining equipment, in order to solve the problems existing in the prior art. This system can simulate the complex working environment of hydraulic hoses in coal mining equipment, and thus test the performance of hoses under complex superimposed loads.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a hydraulic hose performance testing system for coal mining equipment, including a hose testing system mounting frame for fixing and supporting the hydraulic hose test piece. The mounting frame is assembled from high-strength aluminum alloy profiles and connecting accessories, and can be reconfigured and expanded according to testing needs. It is mainly used to fix and support the hydraulic hose test piece and the connecting pipes, accessories, and sensors required for testing. A hydraulic system connected to the hydraulic hose test piece is placed inside the mounting frame. The mounting frame is connected to a multi-degree-of-freedom displacement loading stage and a multi-degree-of-freedom vibration loading stage. A test data sensing system is connected to the hydraulic hose test piece and the hydraulic system. The test data sensing system is connected to a measurement and control system acquisition board assembly. The controller of the measurement and control system acquisition board assembly is connected to the multi-degree-of-freedom vibration loading stage via a power amplifier.

[0008] Optionally, the hydraulic system includes a power system, a heating system, a cooling system, and a sensing and control system; the power system includes a test system oil tank, which is sequentially connected to a main pump and a high-pressure filter via an oil supply pipeline; the main pump is externally connected to a variable frequency motor; the high-pressure filter is connected to one end of a hydraulic hose test piece via an electromagnetic directional valve, and the other end of the hydraulic hose test piece is connected to the electromagnetic directional valve via a pipeline equipped with a pressure sensor; the electromagnetic directional valve is connected to the test system oil tank via a return oil pipeline; the oil supply pipeline and the return oil pipeline are connected via an electromagnetic relief valve; the heating system includes a filter and a normally open shut-off valve. A heating device is connected to the oil tank of the test system, and the output end of the heating device is connected to the oil tank of the test system through a hot oil circuit. The cooling system includes a cooling device connected to the oil tank of the test system through a filter and a normally open shut-off valve, and the output end of the cooling device is connected to the oil tank of the test system through a cold oil circuit. Magnetic return oil filters are respectively installed on the hot oil circuit and the cold oil circuit. The sensing and control system includes a temperature sensor, a pressure sensor, and a flow sensor. The temperature sensor is externally connected to both the heating device and the cooling device. The pressure sensor and the flow sensor are connected to the oil delivery pipeline near the hydraulic hose test piece.

[0009] Optionally, a replenishment system is also included, comprising an external oil tank, a replenishment pump, a normally closed shut-off valve, a spring-loaded check valve, and a filter connected in sequence. The filter is connected to the oil tank of the test system. A check valve is arranged in parallel on one side of the filter of the replenishment system. One end of the check valve is connected to the pipeline between the spring-loaded check valve and the filter, and the other end is connected to the pipeline between the filter and the oil tank of the test system. A thermometer, a level gauge, and an air filter are connected inside the oil tank of the test system.

[0010] Optionally, a flow meter is installed on the return oil pipeline, and the end of the return oil pipeline near the oil tank of the test system is connected to the oil tank of the test system through a filter and a one-way valve arranged in parallel; a normally closed shut-off valve is installed on the outlet pipeline of the oil tank of the test system.

[0011] Optionally, an accumulator and a pressure gauge are connected to the oil inlet line between the high-pressure filter and the solenoid directional valve, and the pressure gauge is connected to the oil inlet line via a normally open shut-off valve.

[0012] Optionally, the hydraulic hose test piece is connected to hose mounting blocks at both ends, and the hose mounting blocks are mounted on the hose testing system mounting frame.

[0013] Optionally, the test data sensing system includes a sensing and control system, a triaxial accelerometer for detecting surface vibration of the hydraulic hose test piece, a triaxial strain gauge for detecting surface stress and strain of the hydraulic hose test piece, a speed sensor for detecting the speed of the variable frequency motor, and a displacement sensor for detecting displacement.

[0014] Optionally, the measurement and control system acquisition board assembly includes a temperature acquisition board, a pressure acquisition board, a flow acquisition board, a vibration acquisition board, a stress / strain acquisition board, a rotational speed acquisition board, a displacement acquisition board, and a controller. The controller is a multi-channel controller, which is connected to a multi-degree-of-freedom vibration loading stage via a power amplifier. The measurement and control system acquisition board assembly is externally connected to a measurement and control system and a display.

[0015] This invention also provides a method for testing the performance of hydraulic hoses in coal mining equipment, comprising the following steps:

[0016] (1) According to the test requirements, install the hydraulic hose test piece into the corresponding oil port position of the hose mounting block, seal the remaining oil ports with oil plugs, install the sensor of the test data sensing system in a fixed position, and perform the test by the testing instrument.

[0017] (2) Start the measurement and control system, check the working status of the test data sensing system and the measurement and control system acquisition board components, and debug them;

[0018] (3) Start the variable frequency motor, and adjust the heating and cooling devices according to the feedback value of the temperature sensor to make the system temperature reach the test specified value; adjust the speed of the electromagnetic overflow valve and the variable frequency motor according to the feedback value of the pressure sensor and flow sensor at the main pump outlet to make the system pressure and flow reach the test specified value.

[0019] (4) If displacement / deformation load is required, connect the hydraulic hose test piece to the multi-degree-of-freedom displacement loading table, adjust the displacement loading table according to the test requirements, apply the corresponding displacement / deformation load, and test it through the testing instrument; if vibration / acceleration load is required, connect the hydraulic hose test piece to the multi-degree-of-freedom vibration loading table, start the power amplifier and the multi-degree-of-freedom vibration loading table, transmit the vibration / acceleration load spectrum signal of the pipeline when the coal mining equipment is working to the power amplifier, and drive the multi-degree-of-freedom vibration loading table to apply the vibration / acceleration load to the hydraulic hose test piece;

[0020] (5) According to the test requirements, the test data sensing system, the measurement and control system acquisition board components and the measurement and control system respectively control, acquire, analyze and post-process the test signals and test results of temperature, pressure, flow rate, acceleration and stress strain in real time;

[0021] (6) After the test is completed, stop the controller and the hydraulic system. The test is over.

[0022] The testing system and method of this invention utilize a highly reconfigurable hose mounting stand, which can be adjusted according to testing requirements to simulate the actual spatial layout of hydraulic hoses in coal mining equipment. Furthermore, the hose mounting block used in this testing system can simultaneously accommodate the installation of six different specifications of commonly used hydraulic hoses in coal mining equipment. It can accurately reproduce and apply multiple superimposed loads such as temperature, fluid pressure, fluid impact, displacement / deformation, and vibration / acceleration, accurately simulating the actual working state of hydraulic hoses in coal mining equipment. Employing a multi-channel NI PXI measurement and control system, coupled with LabVIEW software based on graphical programming, it achieves high control precision and enables real-time control, acquisition, analysis, and hierarchical processing of various test signals such as temperature, pressure, flow rate, acceleration, and stress-strain.

[0023] The present invention achieves the following technical effects compared to the prior art:

[0024] The testing system and method of this invention can install, fix, and calibrate hydraulic hose test pieces according to the complex spatial layout of hydraulic hoses in coal mining equipment, ensuring the consistency and authenticity of the hose installation state. It fully reproduces the multiple superimposed loads, such as temperature, fluid pressure, fluid impact, displacement / deformation, and vibration / acceleration, experienced by the hydraulic hoses in coal mining equipment during operation, with convenient and reliable loading methods. It achieves real-time control, acquisition, and analysis of multiple test signals, including temperature, pressure, flow rate, acceleration, and stress-strain, and performs hierarchical processing of the test data to reduce data volume and ensure data real-time performance and reliability. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the layout of the hydraulic hose performance testing system for coal mining equipment according to the present invention;

[0027] Figure 2 This is a schematic diagram of the hydraulic system connection of the present invention;

[0028] Figure 3 This is a front view of the hose mounting block of the present invention;

[0029] Figure 4 This is a top view of the hose mounting block of the present invention;

[0030] Explanation of reference numerals in the attached diagram: 1-Hydraulic system; 2-External oil tank; 3-Replenishing pump; 4-Normally closed shut-off valve; 5-Spring-loaded check valve; 6-Filter; 7-Check valve; 8-Test system oil tank; 9-Thermometer; 10-Level gauge; 11-Temperature sensor; 12-Air filter; 13-Variable frequency motor; 14-Main pump; 15-Solenoid relief valve; 16-Flow meter; 17-Magnetic return oil filter; 18-Heating device; 19-Cooling device; 20-Normally open shut-off valve; 21-High pressure... 21-Pressure filter; 22-Relief valve; 23-Pressure gauge; 24-Accumulator; 25-Solenoid directional valve; 26-Pressure sensor; 27-Throttle valve; 28-Flow sensor; 29-Hose mounting block; 30-Hydraulic hose test piece; 31-Hose testing system mounting frame; 32-Multi-degree-of-freedom displacement loading stage; 33-Multi-degree-of-freedom vibration loading stage; 34-Test data sensing system; 35-Measurement and control system acquisition board assembly; 36-Measurement and control system and display; 37-Power amplifier. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The purpose of this invention is to provide a performance testing system and method for hydraulic hoses in coal mining equipment, in order to solve the problems existing in the prior art. This system can simulate the complex working environment of hydraulic hoses in coal mining equipment, and thus test the performance of hoses under complex superimposed loads.

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] This invention provides a performance testing system for hydraulic hoses in coal mining equipment, such as... Figure 1 As shown, the system includes a hose testing system mounting frame 31 for fixing and supporting the hydraulic hose test piece 30. The left and right ends of the hydraulic hose test piece 30 are respectively connected to hose mounting blocks 29. The hose test piece 30 is then mounted on the hose testing system mounting frame 31, a multi-degree-of-freedom displacement loading table 32, or a multi-degree-of-freedom vibration loading table 33 via the hose mounting blocks 29 and special tooling. The structure of the hose mounting block 29 is as follows: Figure 3 and Figure 4 As shown, the hose testing system mounting frame 31 houses a hydraulic system 1 connected to the hydraulic hose test piece 30. The hydraulic hose test piece 30 and the hydraulic system 1 are connected to a test data sensing system 34. The test data sensing system 34 mainly includes multiple temperature sensors for detecting the oil temperature in the test system oil tank 8 and the oil temperature inside the hydraulic hose test piece 30; pressure sensors and flow sensors for detecting the pressure and flow rate at the outlet of the main pump 14 and the inlet and outlet of the hydraulic hose test piece 30; a triaxial accelerometer for detecting the surface vibration of the hydraulic hose test piece 30; a triaxial strain gauge for detecting the surface stress and strain of the hydraulic hose test piece 30; a speed sensor for detecting the speed of the variable frequency motor 13; and a displacement sensor for detecting the displacement. The type and number of sensors are matched to the test system and test requirements. The test data sensing system 34 is connected to the measurement and control system acquisition board assembly 35. The controller of the measurement and control system acquisition board assembly 35 is connected to the multi-degree-of-freedom vibration loading table 33 through a power amplifier 37. The multi-degree-of-freedom displacement loading table 32 is connected to the hose test system mounting frame 31 or the multi-degree-of-freedom vibration loading table 33 through a special tooling. On the other hand, it is connected to the hose mounting block or the hydraulic hose test piece 30 through a tooling or pipe clamp, realizing the composite motion of the hydraulic hose test piece 30 in the X, Y, and Z axes and the rotation around the X, Y, and Z axes, thereby providing the displacement / deformation load required during the test. The multi-degree-of-freedom vibration loading table 33 is placed inside the hose test system mounting frame 31 and is connected to the hose mounting block or the hydraulic hose test piece 30 through a tooling or pipe clamp. It accurately reproduces composite motions such as sine waves, triangular waves, random waves, and swaying and vibration, thereby providing the vibration / acceleration load required during the test.

[0035] Hydraulic system 1 includes a power system, a heating system, a cooling system, a fluid replenishment system, and a sensing and control system, such as... Figure 2As shown; the power system includes a test system oil tank 8, which is connected in sequence to a main pump 14 and a high-pressure filter 21 via an oil supply pipeline. A variable frequency motor 13 is externally connected to the main pump 14. The high-pressure filter 21 is connected to one end of a hydraulic hose test piece 30 via an electromagnetic directional valve 25. An overflow valve 22 is installed parallel to the high-pressure filter 21, connected to the oil inlet pipelines between the main pump 14 and the electromagnetic directional valve 25. A throttle valve 27 is installed on the oil inlet pipeline connecting the electromagnetic directional valve 25 and the hydraulic hose test piece 30. The other end of the hydraulic hose test piece 30 is connected to the electromagnetic directional valve 25 via a pipeline equipped with a pressure sensor 26. The electromagnetic directional valve 25 is connected to the test system oil tank 8 via a return oil pipeline. A flow meter 16 is installed on the return oil pipeline. The oil supply pipeline and the return oil pipeline are connected... The heating system, connected via an electromagnetic overflow valve 15, includes a heating device 18 connected to the test system oil tank 8 via a filter 6 and a normally open shut-off valve 20. The output of the heating device 18 is connected to the test system oil tank 8 via a hot oil circuit. The cooling system includes a cooling device 19 connected to the test system oil tank 8 via a filter 6 and a normally open shut-off valve 20. The output of the cooling device 19 is connected to the test system oil tank 8 via a cold oil circuit. Magnetic return oil filters 17 are installed on both the hot and cold oil circuits. The sensing and control system includes a temperature sensor 11, a pressure sensor 26, and a flow sensor 28. Temperature sensors 11 are externally connected to both the heating device 18 and the cooling device 19. A pressure sensor 26 and a flow sensor 28 are connected to the oil supply pipeline near the hydraulic hose test piece 30. The hydraulic system is an integrated hydraulic system, see [link to documentation]. Figure 2 The power system aims to ensure adjustable pressure before the electromagnetic directional valve 25, remotely controllable automatic unloading, and maintain oil cleanliness. The fluid replenishment system aims to replenish the oil tank 8 of the test system in a timely manner. The heating and cooling systems aim to accurately control the oil temperature of the test system. The sensing and control system aims to collect the pressure, flow rate, and temperature of the test system in real time for easy control. The oil temperature is collected by the temperature sensor 11 and sent to the controller for comparison with the set temperature, thereby achieving closed-loop control. The hydraulic system is placed inside the hose test system mounting frame and connected to the mounting block through hoses, providing the temperature load, fluid pulsation load, and fluid impact load required during testing. The fluid replenishment system includes an external oil tank 2, a replenishment pump 3, a normally closed shut-off valve 4, a spring-loaded check valve 5, and a filter 6 connected in sequence. The filter 6 is connected to the oil tank 8 of the test system; a check valve 7 is arranged in parallel on one side of the filter 6 of the fluid replenishment system; a thermometer 9, a level gauge 10, and an air filter 12 are connected inside the oil tank 8 of the test system.

[0036] In a further preferred embodiment, the end of the return oil line near the test system oil tank 8 is connected to the test system oil tank 8 via a filter 6 and a one-way valve 7 arranged in parallel; a normally closed shut-off valve 4 is installed on the outlet line of the test system oil tank 8. An accumulator 24 and a pressure gauge 23 are connected to the oil inlet line between the high-pressure filter 21 and the solenoid directional valve 25, and the pressure gauge 23 is connected to the oil inlet line via a normally open shut-off valve 20.

[0037] The test data sensing system 34 includes a sensing and control system, a triaxial accelerometer for detecting surface vibration of the hydraulic hose test piece, a triaxial strain gauge for detecting surface stress and strain of the hydraulic hose test piece, a speed sensor for detecting the speed of the variable frequency motor, and a displacement sensor for detecting displacement. The measurement and control system acquisition board assembly 35 includes temperature acquisition boards, pressure acquisition boards, flow acquisition boards, vibration acquisition boards, stress / strain acquisition boards, speed acquisition boards, displacement acquisition boards, and a controller. The controller is a multi-channel controller, connected to a multi-degree-of-freedom vibration loading stage via a power amplifier. The power amplifier consists of logic units, power units, and control units, with several power units operating in parallel. Power modules and power amplifier power supply modules can be added or removed according to the capacity required by the test system and testing needs, realizing the input, conversion, and output of control signals. The measurement and control system acquisition board assembly 35 is externally connected to a measurement and control system and a display 36. The measurement and control system is a multi-channel (124-channel) NI PXI measurement and control system, including an expansion chassis, controller, analog output module, signal acquisition module, cables, and junction box, capable of acquiring various data such as temperature, pressure, flow, vibration, and stress / strain. It is also equipped with LabVIEW software based on graphical programming and a display, enabling control of the test system, detection of test data, post-processing of test data, and visualization of results. After installation, all the above components must be tested for levelness, angle and position using high-precision testing instruments (including digital level, angle gauge, torque wrench, right-hand caliper and micrometer, etc.); all sensors must be calibrated before use.

[0038] The present invention also provides a method for testing the performance of hydraulic hoses in coal mining equipment based on the above-mentioned testing system, comprising the following steps:

[0039] (1) According to the test requirements, the hydraulic hose test piece 30 is installed at the corresponding oil port position of the hose mounting block 29, the remaining oil ports are sealed with oil plugs, the sensor of the test data sensing system is installed in a fixed position, and the test is performed by the testing instrument.

[0040] (2) Start the measurement and control system, check the working status of the test data sensing system and the measurement and control system acquisition board component 35, and debug them;

[0041] (3) Start the variable frequency motor 13, and adjust the heating device 18 and cooling device 19 according to the feedback value of the temperature sensor 11 to make the system temperature reach the test specified value; and adjust the speed of the electromagnetic overflow valve 15 and the variable frequency motor 13 according to the feedback value of the pressure sensor 26 and flow sensor 28 at the outlet of the main pump 14 to make the system pressure and flow reach the test specified value.

[0042] (4) If displacement / deformation load is required, connect the hydraulic hose test piece 30 to the multi-degree-of-freedom displacement loading stage 32, and adjust the displacement loading stage according to the test requirements to apply the corresponding displacement / deformation load, and perform the test by the testing instrument; if vibration / acceleration load is required, connect the hydraulic hose test piece 30 to the multi-degree-of-freedom vibration loading stage 33, start the power amplifier and the multi-degree-of-freedom vibration loading stage, transmit the vibration / acceleration load spectrum signal of the pipeline during the operation of the coal mining equipment to the power amplifier, and drive the multi-degree-of-freedom vibration loading stage to apply the vibration / acceleration load to the hydraulic hose test piece after the load spectrum signal is amplified by the power amplifier 37.

[0043] (5) According to the test requirements, the test signals and test results of temperature, pressure, flow rate, acceleration and stress strain are controlled, collected, analyzed and post-processed in real time through the test data sensing system 34, the measurement and control system acquisition board component 35 and the measurement and control system respectively.

[0044] (6) After the test is completed, stop the controller and stop the hydraulic system 1. The test is over.

[0045] In the description of this invention, it should be noted that the terms "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A performance testing system for hydraulic hoses in coal mining equipment, characterized in that: The system includes a hose testing system mounting frame for fixing and supporting a hydraulic hose test piece. The mounting frame houses a hydraulic system connected to the hydraulic hose test piece. The mounting frame is connected to a multi-degree-of-freedom displacement loading stage and a multi-degree-of-freedom vibration loading stage. A test data sensing system is connected to the hydraulic hose test piece and the hydraulic system. This test data sensing system is connected to a measurement and control system acquisition board assembly. The controller of the measurement and control system acquisition board assembly is connected to the multi-degree-of-freedom vibration loading stage via a power amplifier. The hydraulic system includes a power system, a heating system, a cooling system, and a sensing and control system. The power system includes a test system oil tank, which is sequentially connected to a main pump and a high-pressure filter via an oil supply pipeline. The main pump is externally connected to a variable frequency motor. The high-pressure filter is connected to one end of the hydraulic hose test piece via an electromagnetic reversing valve, and the other end of the hydraulic hose test piece is connected via a... A pressure sensor is connected to the solenoid directional valve, which is connected to the test system oil tank via a return oil line. The oil supply line and the return oil line are connected via a solenoid relief valve. The heating system includes a heating device connected to the test system oil tank via a filter and a normally open shut-off valve. The output of the heating device is connected to the test system oil tank via a hot oil circuit. The cooling system includes a cooling device connected to the test system oil tank via a filter and a normally open shut-off valve. The output of the cooling device is connected to the test system oil tank via a cold oil circuit. Magnetic return oil filters are installed on both the hot and cold oil circuits. The sensing and control system includes a temperature sensor, a pressure sensor, and a flow sensor. The temperature sensor is externally connected to both the heating and cooling devices. The pressure sensor and flow sensor are connected to the oil supply line near the hydraulic hose test piece.

2. The hydraulic hose performance testing system for coal mining equipment according to claim 1, characterized in that: It also includes a replenishment system, which comprises an external oil tank, an oil replenishment pump, a normally closed shut-off valve, a spring-loaded check valve, and a filter connected in sequence. The filter is connected to the oil tank of the test system. A check valve is arranged in parallel on one side of the filter of the replenishment system. A thermometer, a level gauge, and an air filter are connected inside the oil tank of the test system.

3. The hydraulic hose performance testing system for coal mining equipment according to claim 1, characterized in that: A flow meter is installed on the return oil pipeline. The end of the return oil pipeline near the oil tank of the test system is connected to the oil tank of the test system through a filter and a one-way valve arranged in parallel. A normally closed shut-off valve is installed on the outlet pipeline of the oil tank of the test system.

4. The hydraulic hose performance testing system for coal mining equipment according to claim 1, characterized in that: An accumulator and a pressure gauge are connected to the oil inlet line between the high-pressure filter and the solenoid directional valve. The pressure gauge is connected to the oil inlet line via a normally open shut-off valve.

5. The hydraulic hose performance testing system for coal mining equipment according to claim 1, characterized in that: The hydraulic hose test piece is connected to hose mounting blocks at both ends, and the hose mounting blocks are mounted on the hose testing system mounting frame.

6. The hydraulic hose performance testing system for coal mining equipment according to claim 1, characterized in that: The test data sensing system includes a sensing and control system, a triaxial accelerometer for detecting surface vibration of the hydraulic hose test piece, a triaxial strain gauge for detecting surface stress and strain of the hydraulic hose test piece, a speed sensor for detecting the speed of the variable frequency motor, and a displacement sensor for detecting displacement.

7. The hydraulic hose performance testing system for coal mining equipment according to claim 6, characterized in that: The measurement and control system's acquisition board assembly includes temperature acquisition board, pressure acquisition board, flow acquisition board, vibration acquisition board, stress / strain acquisition board, rotational speed acquisition board, displacement acquisition board, and a controller. The controller is a multi-channel controller, which is connected to a multi-degree-of-freedom vibration loading stage via a power amplifier. The measurement and control system's acquisition board assembly is externally connected to a measurement and control system and a display.

8. A method for testing the performance of hydraulic hoses in coal mining equipment based on the performance testing system for hydraulic hoses of coal mining equipment according to any one of claims 1 to 7, characterized in that: Includes the following steps: (1) According to the test requirements, install the hydraulic hose test piece into the corresponding oil port position of the hose mounting block, seal the remaining oil ports with oil plugs, install the sensor of the test data sensing system in a fixed position, and perform the test by the testing instrument. (2) Start the measurement and control system, check the working status of the test data sensing system and the measurement and control system acquisition board components, and debug them; (3) Start the variable frequency motor, and adjust the heating and cooling devices according to the feedback value of the temperature sensor to make the system temperature reach the test specified value; adjust the speed of the electromagnetic overflow valve and the variable frequency motor according to the feedback value of the pressure sensor and flow sensor at the main pump outlet to make the system pressure and flow reach the test specified value. (4) If displacement / deformation load is required, connect the hydraulic hose test piece to the multi-degree-of-freedom displacement loading table, adjust the displacement loading table according to the test requirements, apply the corresponding displacement / deformation load, and test it through the testing instrument; if vibration / acceleration load is required, connect the hydraulic hose test piece to the multi-degree-of-freedom vibration loading table, start the power amplifier and the multi-degree-of-freedom vibration loading table, transmit the vibration / acceleration load spectrum signal of the pipeline when the coal mining equipment is working to the power amplifier, and drive the multi-degree-of-freedom vibration loading table to apply the vibration / acceleration load to the hydraulic hose test piece; (5) According to the test requirements, the test data sensing system, the measurement and control system acquisition board components and the measurement and control system respectively control, acquire, analyze and post-process the test signals and test results of temperature, pressure, flow rate, acceleration and stress strain in real time; (6) After the test is completed, stop the controller and the hydraulic system. The test is over.

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