A reliability test platform for large radio hydraulic cylinders

Abstract

The present invention relates to the field of mechanical manufacturing technology, and in particular to a large radio hydraulic cylinder reliability test platform. The large radio hydraulic cylinder reliability test platform includes: a power module, a test module and a loading module; the present invention realizes the high-precision, variable load, low power consumption and multiple synchronous reliability test functions of the cylinder through a simpler combination of components: the present invention improves the current situation of the single test data of the existing cylinder test bench, and performs reliability tests on two cylinders synchronously, thereby improving the test stability; improves the current situation of the existing cylinder test bench only focusing on the two states of work and failure, and uses 3 displacement sensors and 2 pressure sensors to accurately detect the cylinder leakage in real time and record the test data of the whole cycle; improves the current situation that the existing cylinder test bench cannot perform variable load tests.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical manufacturing, and in particular to a reliability testing platform for a large radio hydraulic cylinder. Background Art

[0002] The Five-hundred-meter Aperture Spherical Radio Telescope (FAST) is the world's largest and most sensitive radio telescope. The active deformation of its reflective surface is jointly driven by 2,225 hydraulic actuators. The surface accuracy of the reflective surface is the basis of the high performance of the telescope, and the flexible cable net structure is highly sensitive to the position error of the reflective surface nodes, which puts forward stringent requirements on the reliability of the actuator. In order to improve the reliability of the actuator, it is necessary to conduct reliability tests on the key component of the actuator, the cylinder, to grasp the remaining reliability of the actuator and ensure the long-term reliable and stable operation of the telescope.

[0003] The existing oil cylinder reliability test system has a constant load, and the load requires the test platform to be continuously loaded. Since the reliability test has the characteristics of a long cycle, the power consumption of the oil cylinder reliability test is very large. At the same time, the existing oil cylinder reliability test only focuses on the two states of working and failure, and cannot monitor its degradation process. In addition, the existing oil cylinder reliability test platform can only test one tested oil cylinder, and cannot perform synchronous testing on multiple units. The data measured by different test platforms cannot be consistent in working conditions, resulting in certain errors in the test data and results.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a large radio hydraulic cylinder reliability testing platform to solve the technical problems existing in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a large radio hydraulic cylinder reliability test platform, which comprises: a power module, a test module and a loading module;

[0008] The power module comprises: a first filter, a one-way quantitative pump, a first servo motor, a two-position three-way electromagnetic reversing valve, a relief valve and a fuel tank; the input end of the first filter is connected to the fuel tank, and the other end of the first filter is connected to the input end of the one-way quantitative pump; the output end of the one-way quantitative pump is connected to the input end of the two-position three-way electromagnetic reversing valve, the input end of the relief valve is connected to the oil circuit between the output end of the one-way quantitative pump and the input end of the two-position three-way electromagnetic reversing valve, and the output end of the relief valve is connected to the fuel tank; the first servo motor is connected to the one-way quantitative pump;

[0009] The test module includes: a first tested oil cylinder, a second tested oil cylinder, a first position sensor, a second position sensor, a first oil pressure sensor, a rotating wheel, a second servo motor, and a bridge filter system; the rod chamber oil port of the first tested oil cylinder is connected to the right position output end of the two-position three-way electromagnetic reversing valve through an oil circuit, the first oil pressure sensor is connected to the oil circuit between the rod chamber oil port of the first tested oil cylinder and the right position output end of the two-position three-way electromagnetic reversing valve, and the first oil pressure sensor is used to detect the rod chamber oil pressure of the first tested oil cylinder; the rod chamber of the first tested oil cylinder is connected to the second tested oil cylinder. The rod chambers of the oil cylinders are connected through a bridge filter system, the rodless chamber of the first tested oil cylinder and the rodless chamber of the second tested oil cylinder are connected to the oil tank through an oil circuit, the first position sensor is installed in the first tested oil cylinder to monitor the position information of the piston of the first tested oil cylinder, and the second position sensor is installed in the second tested oil cylinder to monitor the position information of the piston of the second tested oil cylinder; the first tested oil cylinder, the second tested oil cylinder and the rotating wheel are connected through a chain, and the second servo motor drives the rotating wheel to rotate to drive the first tested oil cylinder and the second tested oil cylinder to perform telescopic actions alternately;

[0010] The loading module includes: a first one-way valve, a proportional relief valve, a loading cylinder, a second oil pressure sensor and a third position sensor. The input end of the first one-way valve is connected to the left-position output end of the two-position three-way electromagnetic reversing valve, and the output end of the first one-way valve is connected to the input end of the proportional relief valve and the rod chamber of the loading cylinder; the output end of the proportional relief valve and the rodless chamber of the loading cylinder are connected to the oil tank; the second oil pressure sensor is used to detect the oil pressure in the rod chamber of the loading cylinder, and the third position sensor is installed in the loading cylinder to monitor the position information of the loading cylinder piston. The piston rod of the loading cylinder is connected to the rotating wheel disc to adjust the position of the rotating wheel disc.

[0011] As a further technical solution, the bridge-type filtering system includes: a second one-way valve, a third one-way valve, a fourth one-way valve, a fifth one-way valve, and a second filter; the rod chamber of the first measured oil cylinder, the oil outlet of the fourth one-way valve, and the oil inlet of the fifth one-way valve are interconnected through an oil circuit, the oil inlet of the fourth one-way valve, the oil inlet of the third one-way valve, and the oil outlet of the second filter are interconnected through an oil circuit, and the oil inlet of the second filter, the oil outlet of the second one-way valve, and the oil outlet of the fifth one-way valve are interconnected; the rod chamber of the second measured oil cylinder, the oil inlet of the second one-way valve, and the oil outlet of the third one-way valve are interconnected through an oil circuit.

[0012] By adopting the above technical solution, the present invention has the following beneficial effects:

[0013] Compared with the existing oil cylinder test bench, the present invention realizes the high-precision, variable load, low power consumption and multiple synchronous reliability testing functions of the oil cylinder through a simpler combination of components: the present invention improves the current situation of the single test data of the existing oil cylinder test bench, and performs reliability tests on two oil cylinders synchronously, thereby improving the test stability; improves the current situation of the existing oil cylinder test bench that only focuses on the two states of working and failure, and accurately detects the leakage of the oil cylinder in real time through 3 displacement sensors and 2 pressure sensors, and records the test data of the whole cycle; improves the current situation that the existing oil cylinder test bench cannot perform variable load tests, and realizes the variable load working condition test requirements of the tested oil cylinder through a proportional relief valve; improves the current situation that the power consumption of the existing oil cylinder test bench is very large in long-term tests, and the oil cylinder extension and retraction work can be realized by overcoming the friction between the oil cylinder itself and the rotating wheel, thereby achieving minimum power consumption in the full-cycle reliability test; improves the current situation that the oil becomes dirty quickly in long-term tests of the existing oil cylinder test bench, and ensures that the oil cleanliness always meets the requirements during the oil cylinder reliability test. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1Schematic diagram of the principle of the large radio hydraulic cylinder reliability test platform provided for the embodiment of the present invention; icons: 1.1-first filter; 1.2-second filter; 2-one-way quantitative pump; 3-two-position three-way electromagnetic reversing valve; 4-overflow valve; 5.1-first one-way valve; 5.2-second one-way valve; 5.3-third one-way valve; 5.4-fourth one-way valve; 5.5-fifth one-way valve; 6-proportional overflow valve; 7-loading cylinder; 8-rotating wheel; 9.1-first servo motor; 9.2-second servo motor; 10.1-first tested cylinder; 10.2-second tested cylinder; 11.1-first position sensor; 11.2-second position sensor; 11.3-third position sensor; 12.1-first oil pressure sensor; 12.2-second oil pressure sensor; 13-oil tank. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0020] The present invention provides a large radio hydraulic cylinder reliability test platform, which comprises: a power module, a test module and a loading module;

[0021] The power module comprises: a first filter 1.1, a one-way metering pump 2, a first servo motor 9.1, a two-position three-way electromagnetic reversing valve 3, a relief valve 4 and an oil tank 13; the input end of the first filter 1.1 is connected to the oil tank 13, and the other end of the first filter 1.1 is connected to the input end of the one-way metering pump 2; the output end of the one-way metering pump 2 is connected to the input end of the two-position three-way electromagnetic reversing valve 3, the input end of the relief valve 4 is connected to the oil path between the output end of the one-way metering pump 2 and the input end of the two-position three-way electromagnetic reversing valve 3, and the output end of the relief valve 4 is connected to the oil tank 13; the first servo motor 9.1 is connected to the one-way metering pump 2;

[0022] The test module comprises: a first tested oil cylinder 10.1, a second tested oil cylinder 10.2, a first position sensor 11.1, a second position sensor 11.2, a first oil pressure sensor 12.1, a rotating wheel 8, a second servo motor 9.2, and a bridge filter system; the rod chamber oil port of the first tested oil cylinder 10.1 is connected to the right position output end of the two-position three-way electromagnetic reversing valve 3 through an oil circuit, the first oil pressure sensor 12.1 is connected to the oil circuit between the rod chamber oil port of the first tested oil cylinder 10.1 and the right position output end of the two-position three-way electromagnetic reversing valve 3, and the first oil pressure sensor 12.1 is used to detect the rod chamber oil pressure of the first tested oil cylinder 10.1; the rod chamber of the first tested oil cylinder 10.1 is connected to the second tested oil cylinder 10. 2 are connected through a bridge filter system, the rodless chamber of the first tested oil cylinder 10.1 and the rodless chamber of the second tested oil cylinder 10.2 are connected to the oil tank 13 through an oil circuit, the first position sensor 11.1 is installed in the first tested oil cylinder 10.1, and is used to monitor the position information of the piston of the first tested oil cylinder 10.1, and the second position sensor 11.2 is installed in the second tested oil cylinder 10.2, and is used to monitor the position information of the piston of the second tested oil cylinder 10.2; the first tested oil cylinder 10.1, the second tested oil cylinder 10.2 are connected to the rotating wheel 8 through a chain, and the second servo motor 9.2 drives the rotating wheel 8 to rotate to drive the first tested oil cylinder 10.1 and the second tested oil cylinder 10.2 to perform telescopic actions alternately;

[0023] The loading module includes: a first one-way valve 5.1, a proportional relief valve 6, a loading cylinder 7, a second oil pressure sensor and a third position sensor 11.3. The input end of the first one-way valve 5.1 is connected to the left-position output end of the two-position three-way electromagnetic reversing valve 3, and the output end of the first one-way valve 5.1 is connected to the input end of the proportional relief valve 6 and the rod chamber of the loading cylinder 7; the output end of the proportional relief valve 6 and the rodless chamber of the loading cylinder 7 are connected to the oil tank 13; the second oil pressure sensor is used to detect the oil pressure in the rod chamber of the loading cylinder 7, and the third position sensor 11.3 is installed in the loading cylinder 7 to monitor the position information of the piston of the loading cylinder 7. The piston rod of the loading cylinder 7 is connected to the rotating wheel 8 to adjust the position of the rotating wheel 8.

[0024] As a further technical solution, the bridge filtering system includes: a second one-way valve 5.2, a third one-way valve 5.3, a fourth one-way valve 5.4, a fifth one-way valve 5.5, and a second filter 1.2; the rod chamber of the first measured oil cylinder 10.1, the oil outlet of the fourth one-way valve 5.4, and the oil inlet of the fifth one-way valve 5.5 are interconnected through an oil circuit, the oil inlet of the fourth one-way valve 5.4, the oil inlet of the third one-way valve 5.3, and the oil outlet of the second filter 1.2 are interconnected through the oil circuit, and the oil inlet of the second filter 1.2, the oil outlet of the second one-way valve 5.2, and the oil outlet of the fifth one-way valve 5.5 are interconnected; the rod chamber of the second measured oil cylinder 10.2, the oil inlet of the second one-way valve 5.2, and the oil outlet of the third one-way valve 5.3 are interconnected through the oil circuit.

[0025] In summary, the present invention can realize low-power consumption, variable load, and high-precision synchronous reliability testing of multiple cylinders.

[0026] 1. Variable load reliability test: When the two-position three-way electromagnetic reversing valve 3 is energized, the first servo motor 9.1 drives the one-way quantitative pump 2 to fill the rod chambers of the two tested cylinders (the first tested cylinder 10.1 and the second tested cylinder 10.2) with oil; further, the two-position three-way electromagnetic reversing valve 3 loses power, and the first servo motor 9.1 drives the one-way quantitative pump 2 to fill the rod chamber of the loading cylinder 7 with oil, and the load is adjusted by the proportional relief valve 6; further, the second servo motor 9.2 drives the rotating wheel 8 to rotate forward and reverse, and drives the tested cylinders (the first tested cylinder 10.1 and the second tested cylinder 10.2) through the chain to realize the telescopic action. If a fixed load reliability test is performed, the first servo motor 9.1 can stop and wait after completing the loading of the loading cylinder 7, and the second servo motor 9.2 only needs to overcome the friction between the two tested cylinders (the first tested cylinder 10.1 and the second tested cylinder 10.2) and the rotating wheel 8 to complete the reliability test of the cylinder.

[0027] 2. High-precision reliability test: An oil filter device is provided between the rod chambers of the two tested oil cylinders (the first tested oil cylinder 10.1 and the second tested oil cylinder 10.2) of the present invention to ensure the cleanliness of the oil; and high-precision position sensors are installed in the tested oil cylinders (the first tested oil cylinder 10.1 and the second tested oil cylinder 10.2) and the loading oil cylinder 77 to monitor the real-time dynamic position information of the piston rod. In addition, high-precision pressure sensors are installed in the rod chambers of the tested oil cylinders and the loading oil cylinder 7 to monitor the oil pressure. Through the high-precision real-time monitoring data of pressure and position, the process data of the reliability degradation of the oil cylinder can be accurately monitored. The present invention designs a bridge filter system composed of a second one-way valve 5.2, a third one-way valve 5.3, a fourth one-way valve 5.4, a fifth one-way valve 5.5, and a second filter 1.2 to ensure the cleanliness of the oil during the oil cylinder reliability test, reduce the disturbance of the oil cylinder reliability data caused by the oil cleanliness, and ensure the accuracy of the oil cylinder reliability test data.

[0028] 3. Low power consumption reliability test: The present invention only needs to overcome the friction between the oil cylinder itself and the rotating wheel 8 to perform the work of extending and retracting the oil cylinder, and the full cycle reliability test achieves minimum power consumption.

[0029] 4. Multiple synchronous reliability tests: The present invention can perform reliability tests on two oil cylinders synchronously. The synchronous tests of multiple samples under the same conditions can better reflect the real reliability of the oil cylinders.

[0030] Aiming at actual needs, the present invention realizes the variable load reliability test function of the large radio telescope actuator cylinder through a combination of simple components, and has the advantages of low power consumption, high precision, variable load and multi-unit synchronization compared with the existing cylinder reliability test platform.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A testing method for a large radio hydraulic cylinder reliability testing platform, characterized in that: include: Variable load reliability test; The reliability test platform of the large radio hydraulic cylinder includes: a power module, a test module and a loading module; the power module includes: a first filter, a one-way quantitative pump, a first servo motor, a two-position three-way electromagnetic reversing valve, a relief valve and an oil tank; the input end of the first filter is connected to the oil tank, and the other end of the first filter is connected to the input end of the one-way quantitative pump; the output end of the one-way quantitative pump is connected to the input end of the two-position three-way electromagnetic reversing valve, the input end of the relief valve is connected to the oil circuit between the output end of the one-way quantitative pump and the input end of the two-position three-way electromagnetic reversing valve, and the output end of the relief valve is connected to the oil tank; the first servo motor is connected to the one-way quantitative pump The test module comprises: a first tested oil cylinder, a second tested oil cylinder, a first position sensor, a second position sensor, a first oil pressure sensor, a rotating wheel, a second servo motor, and a bridge filter system; the rod chamber oil port of the first tested oil cylinder is connected to the right position output end of the two-position three-way electromagnetic reversing valve through an oil circuit, and the first oil pressure sensor is connected to the oil circuit between the rod chamber oil port of the first tested oil cylinder and the right position output end of the two-position three-way electromagnetic reversing valve, and the first oil pressure sensor is used to detect the rod chamber oil pressure of the first tested oil cylinder; the rod chamber of the first tested oil cylinder is connected to the second tested oil cylinder. The rod chambers of the cylinders are connected through a bridge filter system, the rodless chamber of the first tested cylinder and the rodless chamber of the second tested cylinder are connected to the oil tank through an oil circuit, the first position sensor is installed in the first tested cylinder to monitor the position information of the piston of the first tested cylinder, and the second position sensor is installed in the second tested cylinder to monitor the position information of the piston of the second tested cylinder; the first tested cylinder and the second tested cylinder are connected to the rotating wheel through a chain, and the second servo motor drives the rotating wheel to rotate to drive the first tested cylinder and the second tested cylinder to perform telescopic actions alternately; the loading The module includes: a first one-way valve, a proportional relief valve, a loading oil cylinder, a second oil pressure sensor and a third position sensor. The input end of the first one-way valve is connected to the left position output end of the two-position three-way electromagnetic reversing valve, and the output end of the first one-way valve is connected to the input end of the proportional relief valve and the rod chamber of the loading oil cylinder; the output end of the proportional relief valve and the rodless chamber of the loading oil cylinder are connected to the oil tank; the second oil pressure sensor is used to detect the oil pressure of the rod chamber of the loading oil cylinder, and the third position sensor is installed in the loading oil cylinder to monitor the position information of the loading oil cylinder piston. The piston rod of the loading oil cylinder is connected to the rotating wheel disc to adjust the position of the rotating wheel disc; The variable load reliability test includes: when the two-position three-way electromagnetic reversing valve is energized, the first servo motor drives the one-way metering pump to fill the rod chambers of the first tested cylinder and the second tested cylinder with oil; when the two-position three-way electromagnetic reversing valve loses power, the first servo motor drives the one-way metering pump to fill the rod chambers of the loading cylinder with oil, and the load is adjusted by the proportional relief valve; the second servo motor drives the rotating wheel to rotate forward and reverse, and drives the first tested cylinder and the second tested cylinder to realize telescopic action through the chain.

2. The testing method of the large radio hydraulic cylinder reliability testing platform according to claim 1 is characterized in that: The bridge filtering system includes: a second one-way valve, a third one-way valve, a fourth one-way valve, a fifth one-way valve, and a second filter; the rod chamber of the first measured oil cylinder, the oil outlet of the fourth one-way valve, and the oil inlet of the fifth one-way valve are interconnected through an oil circuit, the oil inlet of the fourth one-way valve, the oil inlet of the third one-way valve, and the oil outlet of the second filter are interconnected through an oil circuit, and the oil inlet of the second filter, the oil outlet of the second one-way valve, and the oil outlet of the fifth one-way valve are interconnected; the rod chamber of the second measured oil cylinder, the oil inlet of the second one-way valve, and the oil outlet of the third one-way valve are interconnected through an oil circuit.

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