A follow-up rod hot test system and test method

Abstract

The present invention belongs to the technical field of aero-engine test, and discloses a follow-up rod hot test system and a test method. The system includes a follow-up rod, a heating unit and a sealed test unit. Among them, the heating unit is connected to the test unit through a pipeline. The follow-up rod is arranged on the heating unit, and strain gauges are fixedly arranged thereon. One end of the follow-up rod is fixedly connected to the bleed valve in the test unit, and the other end is fixedly connected to a connecting rod of the anti-surge actuator in the test unit. According to the method of the present invention, a sealed test unit is built, and the loading and debugging of the test unit are carried out; the sealing performance test and comprehensive test of the loaded and debugged test unit are carried out; the values of fractures at different positions on the follow-up rod during the test are used to specifically improve the application scenario and processing technology of the follow-up rod, which has certain reference significance for actual work and ensures the use safety of the engine and the safety of the test personnel.

Description

Technical Field

[0001] The present invention belongs to the technical field of aero-engine test technology, and particularly relates to a follow-up rod hot test system and a test method thereof. Background Art

[0002] When an aero-gas turbine engine operates in a low-speed range, the airflow direction entering the blades of each stage of the compressor does not match the installation angle of the blades, which will cause stall in the first few stages of the compressor and blockage in the last few stages. In severe cases, it will lead to compressor surge. In the prior art, the bleed valve mechanism is an effective control measure to prevent engine surge. Generally, a bleed valve is installed at the outlet of the compressor. Within a specified speed range, the follow-up rod of the bleed valve drives the bleed valve to open and close through the power provided by the anti-surge actuator, releases a part of the compressed air at the rear of the axial compressor, prevents the compressor from surging, and increases the operating stability of the engine.

[0003] In recent years, there have been multiple failures of the follow-up rod of the aero-engine bleed valve, resulting in the failure of the anti-surge system and directly affecting the use safety of the engine. Due to the complex structure and force of the bleed mechanism where the follow-up rod is located, it is difficult to accurately obtain the force condition of the follow-up rod during operation through theoretical calculation. Testing the follow-up rod of the bleed valve during the actual operation of an aero-engine is difficult, and it poses a certain threat to the aero-engine itself and the safety of the test personnel. Moreover, the existing test units and test systems test the follow-up rod at room temperature, and the test results cannot meet the high-temperature scenarios of the actual application of the follow-up rod, and the measurement results have no reference significance for the actual application scenario and the processing technology of the follow-up rod. Summary of the Invention

[0004] The purpose of the present invention is to provide a follow-up rod hot test system and a test method thereof to solve the problems in the prior art;

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A follow-up rod hot test system includes a follow-up rod, a heating unit, and a sealed test unit. Among them, the heating unit is connected to the test unit through a pipeline. The follow-up rod is arranged on the heating unit, and a strain gauge is fixedly arranged thereon. One end of the follow-up rod is fixedly connected to the bleed valve in the test unit, and the other end is fixedly connected to a connecting rod that is connected to the anti-surge actuator in the test unit.

[0007] Further, the test unit includes a high-pressure casing, an intermediate casing, and a low-pressure casing. Among them,

[0008] The high-pressure casing is fixedly arranged on the upper part of the intermediate casing. A first output pipeline and a second output pipeline are fixedly arranged on the upper part of the high-pressure casing. The first output pipeline and the second output pipeline converge to form a high-pressure casing output main pipeline;

[0009] The bottom of the intermediate casing is fixedly connected to the upper part of the low-pressure casing;

[0010] A bleed main pipeline and a bleed valve are fixedly arranged on the high-pressure casing. A follower rod is fixedly arranged on the bleed valve and is fixedly connected to one end of the follower rod, and is fixedly connected to one end of a connecting rod at the other end of the follower rod;

[0011] An anti-surge actuator is fixedly arranged on the low-pressure casing. The output end of the anti-surge actuator is fixedly connected to the other end of the connecting rod.

[0012] Further, the heating unit includes an air compressor, a gas storage tank, a heater and a pneumatic regulating valve. Among them, the air compressor is fixedly connected to one end of the gas storage tank. The heater and the pneumatic regulating valve are connected in parallel. The two ends of the parallel connection respectively form an input main pipeline and an output main pipeline. The input main pipeline is connected to the other end of the gas storage tank. The output main pipeline is connected to the top of the high-pressure casing in the test unit.

[0013] Further, a first branch pipeline and a second branch pipeline are arranged at the end of the pipeline of the input main pipeline. An inflation valve is arranged on the input main pipeline. The ends of the first branch pipeline and the second branch pipeline are respectively fixedly connected to the top of the high-pressure casing. An intake valve is arranged on the first branch pipeline. A hydraulic servo valve is arranged on the second branch pipeline; An output branch pipeline is also arranged on the output main pipeline. The end of the output branch pipeline is connected to the first input end of a silencer. An exhaust valve is arranged on the output branch pipeline; The second input end of the silencer is connected to the high-pressure casing output main pipeline.

[0014] Further, a pressure transmitter and a thermocouple are arranged on the test unit. The pressure transmitter and the thermocouple are respectively connected to the high-pressure casing.

[0015] Further, the strain gauge is arranged at the transfer R of the U-shaped fork and the rotating shaft on the follower rod.

[0016] Further, the strain gauge is a medium-temperature resistance strain gauge.

[0017] Further, a hydraulic servo controller is connected to the input end of the anti-surge actuator.

[0018] A test method for a hot test system of a follower rod includes fixing a strain gauge on the follower rod, setting the follower rod on a sealed test unit, fixing one end of the follower rod to a deflation valve of the test unit, fixing the other end to a connecting rod connected to an anti-surge actuator in the test unit, connecting a heating unit to the sealed test unit through a pipeline, and transmitting the heated heat from the heating unit to the sealed test unit through the pipeline, thereby driving the follower rod to move and completing the hot test of the follower rod.

[0019] Further, when performing the follower rod test, including,

[0020] Build a sealed test unit and perform loading and debugging of the test unit;

[0021] Conduct sealing test on the test unit after loading and debugging;

[0022] A heating unit is arranged on the test unit, and heating debugging of the heating unit is performed;

[0023] After the heating commissioning is completed, the comprehensive commissioning of the test system and the test of the follower rod are carried out;

[0024] Uninstall the test system and complete the follower rod test.

[0025] Compared with the prior art, the advantages of the present invention are:

[0026] A follower rod hot state test system of the present invention heats a sealed test unit through a heating unit, and a follower rod is arranged on the test unit, and a strain gauge is arranged on the follower rod, so that the temperature of the sealed test unit can be adjusted through the heating unit, and the real working scene of the follower rod is simulated. At the same time, the accurate stress condition of the follower rod is obtained by observing the value of the strain gauge on the follower rod, and the application scene and processing technology of the follower rod are targetedly improved according to the values ​​of fractures at different positions on the follower rod during the test, which has certain reference significance for actual work and ensures the safety of engine use and the safety of testers.

[0027] Furthermore, the heating unit uses the structure of an air compressor, an air tank, a heater and a regulating valve so that when air heating is performed, the ambient air is compressed by the air compressor and then enters the air tank for pressure stabilization, thereby reducing the impact of air flow pulsation on the test. The air then enters the heater for heating and is mixed with the normal temperature and high pressure gas after the pneumatic regulating valve is opened to form a high temperature and high pressure gas which passes through the inflation valve and then enters the test unit for testing, thereby effectively adjusting the test temperature and ensuring the effective testing of the follower rod.

[0028] Furthermore, by setting up a structure with a thermocouple and a pressure transmitter on the sealed test unit, the thermocouple and the pressure transmitter can detect the pressure and temperature of the sealed test unit. On the one hand, it is convenient for the operators to monitor the test conditions of the test unit. On the other hand, through the monitoring of pressure and temperature, the safety of the test unit during the test is ensured.

[0029] Furthermore, by arranging the strain gauge at the transfer R between the U-shaped fork and the rotating shaft of the follower rod, the stress level at the fracture position of the follower rod in actual application can be better simulated, providing a better reference basis for the test personnel.

[0030] Furthermore, by connecting the input end of the anti-surge actuator to the hydraulic servo controller, the actual operating states of the anti-surge actuator and the follower rod can be effectively simulated, making the operating state of the follower rod more stable and realistic.

[0031] The test method of a follower rod hot state test system of the present invention realizes the true simulation of the movement and force conditions during the operation of the follower rod in the laboratory environment by setting up the follower rod and the heating unit on the sealed test unit. According to the working and force conditions, stress tests are carried out on the fracture parts of the follower rod under different assembly processes, the cause of the failure is analyzed, the main influencing factors and their influencing laws of the fracture force of the follower rod are found out, providing an important basis for the fracture fault location of the follower rod, the improvement of the assembly process, etc., and ensuring the use safety of the engine and the safety of the test personnel at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The attached drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0033] Figure 1 is the overall structural schematic diagram of a follower rod hot state test system of the present invention;

[0034] Figure 2 is the schematic diagram of the sealing structure of the test unit in a follower rod hot state test system of the present invention;

[0035] Figure 3 is the structural schematic diagram of setting a strain gauge at a certain position on the follower rod in a follower rod hot state test system of the present invention.

[0036] Figure 4 is the structural schematic diagram of a certain position fracture of the follower rod during the use process in a follower rod hot state test system of the present invention.

[0037] Wherein: 1 air compressor, 2 air storage tank, 3 heater, 4 inflation valve, 5 exhaust valve, 6 silencer, 7 intake valve, 8 inlet hydraulic servo valve, 9 outlet hydraulic servo valve, 10 exhaust valve, 11 pressure transmitter, 12 thermocouple, 13 high-pressure casing, 14 bleed main pipe, 15 bleed valve, 16 follower rod, 17 intermediate casing, 18 connecting rod, 19 low-pressure casing, 20 anti-surge actuator, 21 hydraulic servo controller, 22 pneumatic control valve, 23 upper sealing cover plate, 24 upper sealing gasket, 25 lower sealing gasket, 26 lower sealing cover plate, 27 sealing ring, 37 strain gauge. Detailed implementation manners

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0039] The following detailed descriptions are all exemplary descriptions, aiming to provide further detailed descriptions of the present invention. Unless otherwise specified, all technical terms adopted in the present invention have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. The terms used in the present invention are only for describing specific implementation manners, and are not intended to limit the exemplary implementation manners of the present invention.

[0040] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] A follow-up rod hot-state test system and test method of the present invention, through a sealed test unit, the structure of the follow-up rod 16 and the heating unit, test the movement and force conditions of the follow-up rod 16 during the operation of the engine, verify the stress levels at the fracture positions of the follow-up rod 16 under different assembly processes, and conduct stress tests on the fracture positions of the follow-up rod 16 under different assembly processes for the working and force conditions of the follow-up rod 16. Analyze the cause of the failure according to the test results, find out the main influencing factors and their influencing laws of the fracture force of the follow-up rod 16, provide important basis for the fracture fault location of the follow-up rod 16, assembly process improvement, etc., and ensure the use safety of the engine and the safety of the test personnel at the same time.

[0042] Specifically, in combination with Figure 4 and Figure 3 as shown, Figure 4 is the front view of the follow-up rod, and the position e shown in the figure is the fracture position of the follow-up rod. Figure 3 is the left view of the follow-up rod; one end of the bleed valve follow-up rod is a rotating shaft, and the other end is a U-shaped fork. The rotating shaft is connected to the bleed valve control rod of the anti-surge regulation system through an external spline, and the U-shaped fork is connected to the bleed valve. The rotating shaft rotates under the drive of the anti-surge regulation system, causing the U-shaped fork to swing, thereby driving the bleed valve to move to achieve the purpose of opening and closing the bleed valve.

[0043] Specifically, the heating unit is connected to the test unit through a pipeline. The follow-up rod 16 is arranged on the heating unit, and a strain gauge 37 is fixedly arranged. One end of the follow-up rod 16 is fixedly connected to the bleed valve 15 in the test unit, and the other end is fixedly connected to a connecting rod 18 that is connected to the anti-surge actuator 20 in the test unit.

[0044] Preferably, the strain gauge 37 is arranged at the transfer R of the U-shaped fork and the rotating shaft on the follow-up rod 16; preferably, the strain gauge 37 is a medium-temperature resistance strain gauge.

[0045] Specifically, the air compressor 1 is fixedly connected to one end of the gas storage tank 2. The heater 3 is connected in parallel with the pneumatic control valve 22. The two ends of the parallel connection form an input main pipe and an output main pipe respectively. The input main pipe is connected to the other end of the gas storage tank 2, and the output main pipe is connected to the top of the high-pressure casing in the test unit. Specifically, at the end of the input main pipe, there are a first branch pipe and a second branch pipe. An inflation valve 4 is provided on the input main pipe. The ends of the first branch pipe and the second branch pipe are respectively fixedly connected to the top of the high-pressure casing. An intake valve 7 is provided on the first branch pipe, and an inlet hydraulic servo valve 8 is provided on the second branch pipe. An output branch pipe is also provided on the output main pipe. The end of the output branch pipe is connected to the first input end of the silencer 6. An exhaust valve 5 is provided on the output branch pipe. The second input end of the silencer 6 is connected to the output main pipe of the high-pressure casing. After the ambient air is compressed by the air compressor 1, it enters the gas storage tank 2 for pressure stabilization to reduce the influence of airflow pulsation on the test. Subsequently, it enters the heater 3 for heating and then mixes with the normal-temperature high-pressure gas after the pneumatic control valve 22 is opened to form high-temperature high-pressure gas, which enters the sealed test unit through the inflation valve 4. The sealed test unit includes an upper sealing cover plate 23, an upper sealing gasket 24, a high-pressure casing 13, an intermediate casing 17, a lower sealing gasket 25, a lower sealing cover plate 26, and a sealing ring 27. Specifically, the high-pressure casing is fixedly arranged on the upper part of the intermediate casing. A first output pipe and a second output pipe are fixedly arranged on the upper part of the high-pressure casing. One ends of the first output pipe and the second output pipe are fixedly connected to the upper part of the high-pressure casing. The other ends of the first output pipe and the second output pipe converge to form the output main pipe of the high-pressure casing. An outlet hydraulic servo valve 9 is provided on the first output pipe, and an exhaust valve 10 is provided on the second output pipe. The bottom of the intermediate casing is fixedly connected to the upper part of the low-pressure casing 19. A bleed-off main pipe 14 and a bleed-off valve 15 are fixedly arranged on the high-pressure casing. A follower rod 16 is fixedly arranged on the bleed-off valve 15 and is fixedly connected to one end of the follower rod 16. The other end of the follower rod 16 is fixedly connected to one end of the connecting rod 18. An anti-surge actuator 20 is fixedly arranged on the low-pressure casing 19. The output end of the anti-surge actuator 20 is fixedly connected to the other end of the connecting rod 18. The pressure and temperature of the hot gas in the sealed test unit are monitored by a pressure transmitter 11 and a thermocouple 12, and are adjusted by the intake valve 7, the inlet hydraulic servo valve 8, the outlet hydraulic servo valve 9, and the exhaust valve 10. When the system needs to exhaust urgently, the exhaust valve 5 can be opened to discharge the high-temperature high-pressure gas into the atmosphere through the silencer 6. The operation of the anti-surge actuator 20 is controlled by a hydraulic servo controller 21.

[0046] Specifically, a pressure transmitter 11 and a thermocouple 12 are provided on the test unit, and the pressure transmitter 11 and the thermocouple 12 are respectively connected to the high-pressure casing. Specifically, a hydraulic servo controller 21 is connected to the input end of the anti-surge actuator 20

[0047] Specifically, the sealed test unit includes an upper sealing cover plate 23, an upper sealing gasket 24, a high-pressure casing 13, an intermediate casing 17, a lower sealing gasket 25, a lower sealing cover plate 26, and a sealing ring 27. The upper sealing cover plate 23 and the upper sealing gasket 24 are fixed to the rear mounting edge of the a high-pressure casing 13 with bolts. The front mounting edge of the b high-pressure casing 13 and the separating ring of the c intermediate casing 17 are connected with bolts. The sealing ring 27 is installed on the lower sealing cover plate 26, and the lower sealing cover plate 26 and the lower sealing gasket 25 are fixed to the rear end face of the inner casing of the d intermediate casing 17 with bolts. At this time, a sealed cavity is formed between the upper sealing cover plate 23 and the lower sealing cover plate 26. When the follow-up rod 16 drives the bleed valve 15 to open through the power provided by the anti-surge actuator 20, the high-temperature and high-pressure gas in the casing cavity is discharged to the engine bypass duct through the bleed window on the bleed main pipe 14. At this time, in addition to the circumferential torsional stress and axial bending stress, the follow-up rod 16 also bears the impact stress of the high-temperature and high-pressure gas at the moment when the bleed valve 15 opens, and can truly simulate the stress state of the follow-up rod 16.

[0048] Embodiment 2

[0049] A test method for a follow-up rod hot state test system includes fixedly setting a strain gauge 37 on the follow-up rod 16, setting the follow-up rod 16 on the sealed test unit, fixedly connecting one end of the follow-up rod 16 to the bleed valve 15 of the test unit, and fixedly connecting the other end to the connecting rod 18 connected to the anti-surge actuator 20 in the test unit. A heating unit is connected to the sealed test unit through a pipeline, and after being heated, the heating unit is transmitted to the sealed test unit through the pipeline. Drive the follow-up rod 16 to move to complete the hot state test of the follow-up rod 16.

[0050] Specifically, when testing the follow-up rod 16, it includes building a sealed test unit and performing loading and debugging of the test unit; performing a sealing test on the loaded and debugged test unit; setting a heating unit on the test unit and performing heating debugging of the heating unit; after the heating debugging is completed, performing comprehensive debugging of the test system and testing of the follow-up rod 16; unloading the test system to complete the testing of the follow-up rod 16.

[0051] Among them, the follow-up rod 16 in this embodiment is a test element, and the test element is manufactured according to the original ratio of the follow-up rod 16 in actual application. When performing the test, it includes the following steps:

[0052] Step 1. Manufacture the follow-up rod test piece 28. As shown in the appendix Figure 4 As shown, the crack initiation position of the follow-up rod is located at the inner transition R of the follow-up rod. Due to structural and assembly limitations, it is impossible to paste a resistance strain gauge here. The outer side of the same cross-section as the fracture part is selected as the stress measurement point, and a medium-temperature resistance strain gauge is pasted at the measurement point and placed in an oven for heating and curing to ensure that the strain gauge is firmly pasted.

[0053] Step 2. Installation of test components and sealing device 29. According to the assembly requirements of the aero-engine, the low-pressure casing 19 and the intermediate casing 17 are connected by bolts. The lower sealing cover plate 26 with the sealing ring 27 installed is fixed to the rear end face of the inner casing of the intermediate casing 17d with bolts together with the lower sealing gasket 25. The separating ring at the other end c of the intermediate casing 17 is connected to the front mounting edge of the high-pressure casing 13b, and the rear mounting edge at the other end a of the high-pressure casing is connected to the upper sealing gasket 24 and the upper sealing cover plate 23 by bolts. One end of the test piece of the follow-up rod 16 after fabrication is connected to the bleed valve 15, and the other end is connected to the intermediate casing 17 and the connecting rod 18. After the bleed valve 15 and the bleed main pipe 14 are assembled, they are connected to the high-pressure casing 13. The other end of the connecting rod 18 is connected to the anti-surge actuator 20. The follow-up rod 16 controls the opening and closing of the bleed valve 15 through the power provided by the anti-surge actuator 20.

[0054] Step 3. Construction of the hot test system 30. Construct the hot test system as shown in the appendix Figure 1 including an air compressor 1, an air storage tank 2, a heater 3, an inflation valve 4, an evacuation valve 5, a silencer 6, an intake valve 7, an inlet hydraulic servo valve 8, an outlet hydraulic servo valve 9, an exhaust valve 10, a pressure transmitter 11, a thermocouple 12, a hydraulic servo controller 21, and a pneumatic regulating valve 22.

[0055] Step 4. Hydraulic loading commissioning 31. That is, under the condition of no air pressure load, the operation commissioning of the hydraulic actuator and the bleed mechanism is carried out. Start the hydraulic servo controller 21 and conduct a trial run under the low-pressure oil pressure of 1.5 MPa. Observe that the anti-surge actuator 20 and the follow-up rod 16 operate normally, the bleed valve 15 opens and closes normally, and there is no jamming phenomenon. Adjust the outlet pressure of the hydraulic sub-station to the required oil supply pressure for the test, observe that the bleed valve 15 opens and closes normally, and there is no jamming phenomenon, and the hydraulic loading test commissioning is completed.

[0056] Step 5. Sealing performance test 32. That is, the effectiveness of the test sealing device is tested in the cold state. Turn on the air compressor 1, the air storage tank 2, and the inflation valve 4, set the test pressure (not exceeding 30% of the test pressure), hold the pressure for 10 min - 20 min, and check whether the sealing performance of the test components is good. A small amount of air leakage that does not affect the test accuracy is allowed for the air pressure loading.

[0057] Step 6. Heating and debugging 33. That is, hot air is applied to the test assembly for heating and debugging. For the tests of thin-walled parts with internal pressure applied by air in the hot state, the test assembly needs to be preheated by hot air. Turn on the air compressor 1, the air storage tank 2, the heater 3, and the inflation valve 4. Set the intake valve 7 and the exhaust valve 10 to a certain opening degree. Heat with hot air of large flow rate and low pressure (below 20% of the test pressure) through the preheating pipeline. When the temperature in the casing seal cavity reaches the test required temperature, reduce the preheating air flow rate and perform heat preservation preheating. If the temperature in the seal cavity does not reach the test required temperature, the heater power or the tracing pipeline should be adjusted. After reaching the test required temperature, the heating and debugging is completed.

[0058] Step 7. Comprehensive debugging 34. Heat the test assembly according to the method in Step 6. After the temperature in the casing seal cavity reaches the test temperature, turn on the inlet hydraulic servo valve 8 and the outlet hydraulic servo valve 9, and apply 80% of the internal pressure load. When the pressure and temperature are stable, adjust the outlet pressure of the hydraulic sub-station to the test required oil supply pressure. Start the hydraulic servo controller 21, and observe that the opening and closing actions of the air release valve 15 should operate normally. The comprehensive debugging is completed.

[0059] Step 8. Formal test 35. After the above debugging work is completed, enter the formal test.

[0060] Heat the test assembly and apply internal pressure according to the method in Step 7. When the temperature and pressure in the seal cavity reach the test requirements and are stable, adjust the outlet pressure of the hydraulic sub-station to the test required oil supply pressure. Start the hydraulic servo controller 21, control the piston rod of the anti-surge actuator 20 to extend and retract, so as to drive the air release valve 15 to open and close through the follower rod 16, and measure the stress level at the fracture position of the follower rod 16 during the movement process. Use the above test method to test the stress levels at the fracture positions of the follower rods under different assembly processes respectively. Repeat the measurement 3 times for each state and record the test data.

[0061] Step 9. Test unloading 36. After the test is completed, turn off the heater 3, open the drain valve 5. When the temperature at the outlet of the heater 3 drops below 150 °C, turn off the air compressor 1 and the air storage tank 2. Disassemble the air release valve and the follower rod test assembly, sort out and analyze the test data, give the test conclusion, and the test ends.

[0062] As is known by common technical knowledge, the present invention can be implemented by other embodiments that do not depart from its spiritual essence or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and are not the only ones. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or make equivalent substitutions, and any modification or equivalent substitution that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A follow-up rod hot test system, characterized in that, it includes a follow-up rod (16), a heating unit and a sealed test unit. Among them, the heating unit is connected to the test unit through a pipeline. The follow-up rod (16) is arranged on the heating unit. A strain gauge (37) is fixedly arranged on the follow-up rod (16). One end of the follow-up rod (16) is connected to the bleed valve (15) in the test unit, and the other end is fixedly connected to a connecting rod (18) connected to the anti-surge actuator (20) in the test unit; The test unit includes a high-pressure casing (13), an intermediate casing (17), and a low-pressure casing (19). Among them, the high-pressure casing (13) is fixedly arranged on the upper part of the intermediate casing (17). A first output pipeline and a second output pipeline are fixedly arranged on the upper part of the high-pressure casing (13). The first output pipeline and the second output pipeline converge to form a high-pressure casing output main pipeline. An outlet hydraulic servo valve (9) is arranged on the first output pipeline, and an exhaust valve (10) is arranged on the second output pipeline; The bottom of the intermediate casing (17) is fixedly connected to the upper part of the low-pressure casing (19); A bleed main pipeline (14) and a bleed valve (15) are fixedly arranged on the high-pressure casing (13). The bleed valve (15) is fixedly provided with a follow-up rod (16) and is fixedly connected to one end of the follow-up rod (16). The other end of the follow-up rod (16) is fixedly connected to one end of a connecting rod (18); An anti-surge actuator (20) is fixedly arranged on the low-pressure casing (19). The output end of the anti-surge actuator (20) is fixedly connected to the other end of the connecting rod (18).

2. The follow-up rod hot test system according to claim 1, characterized in that, the heating unit includes an air compressor (1), an air storage tank (2), a heater (3) and a pneumatic regulating valve (22). Among them, the air compressor (1) is fixedly connected to one end of the air storage tank (2). The heater (3) is connected in parallel with the pneumatic regulating valve (22). The two ends of the parallel connection respectively form an input main pipeline and an output main pipeline. The input main pipeline is connected to the other end of the air storage tank (2). The output main pipeline is connected to the top of the high-pressure casing (13) in the test unit.

3. The follow-up rod hot test system according to claim 2, characterized in that, a first branch pipeline and a second branch pipeline are arranged at the end of the pipeline of the input main pipeline. An inflation valve (4) is arranged on the input main pipeline. The ends of the first branch pipeline and the second branch pipeline are respectively fixedly connected to the top of the high-pressure casing (13). An intake valve (7) is arranged on the first branch pipeline, and an inlet hydraulic servo valve (8) is arranged on the second branch pipeline; An output branch pipeline is also arranged on the output main pipeline. The end of the output branch pipeline is connected to the first input end of a silencer (6). A drain valve (5) is arranged on the output branch pipeline. The second input end of the silencer (6) is connected to the high-pressure casing output main pipeline.

4. A follow-up rod hot state test system according to claim 1, characterized in that, a pressure transmitter (11) and a thermocouple (12) are provided on the test unit, and the pressure transmitter (11) and the thermocouple (12) are respectively connected to the high-pressure casing (13).

5. A follow-up rod hot state test system according to claim 1, characterized in that, the strain gauge (37) is arranged at the transfer R of the U-shaped fork and the rotating shaft on the follow-up rod (16).

6. A follow-up rod hot state test system according to claim 5, characterized in that, the strain gauge (37) is a medium-temperature resistance strain gauge.

7. A follow-up rod hot state test system according to claim 1, characterized in that, a hydraulic servo controller (21) is connected to the input end of the anti-surge actuator (20).

8. A test method for a follow-up rod hot state test system according to claim 1, characterized in that, it includes fixedly arranging a strain gauge (37) on the follow-up rod (16), arranging the follow-up rod (16) on a sealed test unit, fixedly connecting one end of the follow-up rod (16) to the air release valve (15) of the test unit, and the other end to a connecting rod (18) connected to the anti-surge actuator (20) in the test unit, connecting a heating unit to the sealed test unit through a pipeline, and after the heating unit heats, transmitting it to the sealed test unit through the pipeline to drive the follow-up rod (16) to move, and completing the hot state test of the follow-up rod (16).

9. A test method for a follow-up rod hot state test system according to claim 8, characterized in that, when testing the follow-up rod (16), it includes, building a sealed test unit and performing loading and debugging of the test unit; performing a sealing test on the loaded and debugged test unit; setting a heating unit on the test unit and performing heating debugging of the heating unit; after the heating debugging is completed, performing comprehensive debugging of the test system and testing of the follow-up rod (16); unloading the test system to complete the test of the follow-up rod (16).

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