Axial flow fan hydraulic cylinder working simulation device and testing method

Abstract

The application discloses a hydraulic cylinder working simulation device and a testing method of an axial flow fan, relates to the field of hydraulic cylinder working, and comprises a fixing mechanism, a thrust simulation mechanism, a valve body control mechanism, an oil station mechanism and a display mechanism.The fixing mechanism comprises a first fixing plate, a second fixing plate and a bottom plate, is used for fixing a to-be-tested hydraulic cylinder, and is connected to the to-be-tested hydraulic cylinder through the first fixing plate and the second fixing plate.The thrust simulation mechanism is provided with at least one set of simulation mechanism, and comprises a loading spring, an adjusting rod and a lug.The valve body control mechanism is arranged at the front end of the first fixing plate, is connected to the to-be-tested hydraulic cylinder, and is connected to the oil station mechanism.The oil station mechanism is used for inputting hydraulic oil into the valve body control mechanism.The display mechanism comprises a stroke scale table and a thrust scale table.The application can effectively avoid the waste of manpower and time caused by the installation of a hydraulic cylinder with defects, and reduce the safety risk.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic cylinder operation, in particular to a hydraulic cylinder operation simulation device for axial flow fan and a testing method. BACKGROUND

[0002] The air supply fan, air induction fan and primary fan installed in the air and smoke system of a large-capacity generator set are all adjustable blade axial flow fans, and the rotating angle of the fan blades is adjusted by a hydraulic adjusting device during operation. After the hydraulic cylinder operates for a period of time, it needs to be disassembled for maintenance, and worn parts and sealing elements need to be replaced to ensure that the hydraulic cylinder can operate reliably and without leakage and meet the function of driving the blades to act according to the command.

[0003] The existing solution is to hoist the hydraulic cylinder after maintenance into the fan hub, fasten the hydraulic cylinder body to the thrust disc, the piston to the support cover and the valve core to the servo valve connecting bolt, connect the servo valve inlet and outlet oil and leakage oil interfaces to the corresponding oil pipes of the hydraulic oil station, start the pressure oil pump on the hydraulic oil station, move the valve core by the push-pull hydraulic cylinder servo valve end block, make the hydraulic oil enter or return in the front and rear cavities of the piston, and thus push the cylinder body to drive the blade angle to open or close. During the operation of the hydraulic cylinder, it is necessary to check whether the stroke can meet the mechanical stroke of the blade rotation, and whether the valve core and the servo valve exist leakage.

[0004] However, in this detection condition, the hydraulic cylinder needs to be installed in place and connected to the oil station, and the blade needs to be opened and closed to check the reliability of the hydraulic cylinder maintenance quality through the pressure change of the pressure oil, the rotating angle of the blade and the leakage of the hydraulic cylinder. If there are defects such as low pressure of the pressure oil, insufficient rotating angle of the blade and leakage of the hydraulic cylinder during the debugging of the installed hydraulic cylinder, the hydraulic cylinder needs to be removed and replaced with a new one, and the above test needs to be repeated until the test is qualified, and then the next step can be entered. During this period, a large amount of manpower and time are consumed, and there is a safety risk in hoisting, so a complete detection method before installation is needed to reduce the loss of manpower and material resources. SUMMARY

[0005] To solve the above problems, the present application provides a hydraulic cylinder operation simulation device for axial flow fan and a testing method, which aims to realize the testing of the hydraulic cylinder before installation through the detection device and the matching oil station to ensure reliable operation after installation.

[0006] In some embodiments of the present application, a hydraulic cylinder operation simulation device for axial flow fan and a testing method are provided, which include a fixing mechanism, the fixing mechanism includes a first fixing plate, a second fixing plate and a bottom plate, the fixing mechanism is used for fixing a to-be-tested hydraulic cylinder, and the to-be-tested hydraulic cylinder is clamped between the first fixing plate and the second fixing plate.

[0007] Thrust simulation mechanism, the simulation mechanism is equipped with at least a group, the simulation mechanism includes loading spring, adjusting lever and lug, the adjusting lever is uniformly arranged on one side of the first fixed plate, the lug is uniformly arranged on one side of the second fixed plate, the adjusting lever and the lug position are opposite and one to one.

[0008] Valve control mechanism, the valve control mechanism is arranged at the front end of the first fixed plate and is connected with the hydraulic cylinder to be tested.

[0009] Oil station mechanism, connected with the valve control mechanism, for feeding hydraulic oil to the valve control mechanism.

[0010] Display mechanism, the display mechanism includes stroke scale and thrust scale, the stroke scale and thrust scale are used to read the stroke length and thrust size of the hydraulic cylinder.

[0011] Further, a group of slides are arranged on the top of the bottom plate, the first fixed plate is rotatably connected with a roller, the roller is limited to roll on the slide, the second fixed plate is fixed on the top of the bottom plate and is perpendicular to the slide.

[0012] Further, a spiral top is arranged on the upper surface of the bottom plate, the spiral top is located between the first fixed plate and the second fixed plate, and a supporting plate is arranged on the top of the spiral top.

[0013] Further, the ends of the loading spring are connected with the adjusting lever and the lug respectively, a nut is arranged on the end of the adjusting lever, the nut is located at the front end of the first fixed plate and is opposite to the loading spring, and the nut is used to drive the adjusting lever to pull the loading spring to stretch or retract.

[0014] Further, the valve control mechanism includes a servo valve, an oil inlet hose, an oil return hose and a leakage oil hose, one end of the servo valve is fixedly connected with the interface end of the hydraulic cylinder, the other end of the servo valve is fixedly connected with a connecting block, and the connecting block is used to control the opening and closure of the oil hole of the servo valve.

[0015] Further, the oil station mechanism includes an oil station, a pressure oil pump, a pressure regulating valve and an oil filter screen, one end of the oil inlet hose is fixedly connected with the oil inlet of the servo valve, and the other end is fixedly connected with the oil outlet end of the pressure oil pump, one end of the oil return hose is fixedly connected with the oil outlet of the servo valve, and the other end is fixedly connected with the first oil inlet end of the oil station, one end of the leakage oil hose is fixedly connected with the leakage port of the servo valve, and the other end is fixedly connected with the second oil inlet end of the oil station, the oil inlet hose and the oil outlet end of the pressure oil pump are provided with an oil filter screen, the pressure regulating valve is fixedly connected with the outlet communication pipe of the oil pump of the oil station, and a pressure gauge is arranged on the outlet communication pipe of the oil pump.

[0016] Furthermore, the stroke scale and the thrust scale are arranged side by side at one end of the base plate, and a pointer is provided at the bottom of the first fixed plate. The pointer is used to indicate the stroke length and thrust of the hydraulic cylinder.

[0017] Furthermore, the axial flow fan hydraulic cylinder working simulation device is equipped with a mobile trolley, which is used to move the axial flow fan hydraulic cylinder working simulation device between the warehouse and the site.

[0018] This application provides a test method for a working simulation device of a hydraulic cylinder of an axial flow fan, including step 1: placing the hydraulic cylinder to be tested between the first fixed plate and the second fixed plate, rotating the handle of the screw jack to lift the hydraulic cylinder to be tested to the flange position, and fixing the cylinder body in place.

[0019] Step 2: Fix one end of the loading spring to the lug and hook the other end to the adjusting rod. Tighten the adjusting rod by tightening the nut at the end of the adjusting rod to make the spring evenly stressed.

[0020] Step 3: Connect the inlet hose, return hose, and leakage hose connected to the hydraulic cylinder servo valve to the oil station mechanism.

[0021] Step 4: Start the oil station pressure pump, and adjust the pressure to the working pressure of the hydraulic cylinder to be tested through the pressure regulating valve and pressure gauge. The hydraulic oil in the oil station is pumped out and enters the hydraulic cylinder to be tested through the filter screen, oil inlet pipe and servo valve.

[0022] Step 5: By pushing and pulling the connecting block at the end of the servo valve of the hydraulic cylinder under test, the valve core is moved, controlling the opening and closing of the servo valve oil hole, so that hydraulic oil enters or returns in the front and rear chambers of the piston, pushing or pulling the piston, and the piston drives the front fixed plate of the hydraulic cylinder to move forward or backward, and the stroke scale and thrust scale data are recorded in real time.

[0023] Step 6: Based on the thrust scale, conduct a comprehensive evaluation of the hydraulic cylinder to determine whether it is reliable and can proceed to the next process. The comprehensive evaluation includes a qualification evaluation and a stability evaluation.

[0024] Furthermore, the method for evaluating the conformity of the hydraulic cylinder based on the thrust scale includes having a pre-set table of standard thrust values ​​and a table of standard time variation values ​​under different conditions.

[0025] The thrust difference is calculated by comparing the actual thrust value recorded in real time with the standard thrust value under the same conditions. The first evaluation coefficient is then assigned to the thrust difference to obtain the thrust evaluation value.

[0026] Record the actual time change value of the thrust scale reading, calculate the time change ratio by comparing the real-time recorded actual time change value with the standard time change value under the same conditions, and assign a second evaluation coefficient to the time change ratio to obtain the time change evaluation value.

[0027] The pass / fail evaluation value is obtained based on the displayed numerical value and the evaluation value over time.

[0028] Furthermore, the method for evaluating the stability of the hydraulic cylinder based on the display readings recorded by the thrust scale also includes constructing a hydraulic cylinder model comparison table, which includes several hydraulic cylinder models, and for each hydraulic cylinder model, there are stability testing rules associated with it.

[0029] Based on the model of the hydraulic cylinder to be tested, the applicable stability testing rules are determined in the hydraulic cylinder model comparison table. The stability testing rules include several test oil pressures, and for each test oil pressure, there are standard thrust values ​​and standard change time values.

[0030] According to the stability detection rules determined by the hydraulic cylinder under test, the oil station mechanism is driven to reach the detection oil pressure, and the actual thrust value and actual change time value under each detection oil pressure are collected. The thrust difference between the actual thrust value and the standard thrust value, as well as the time difference between the actual change time value and the standard change time value are calculated.

[0031] The stability evaluation of the hydraulic cylinder is determined based on the thrust difference and time difference corresponding to each detected oil pressure.

[0032] This application discloses a working simulation device and testing method for an axial flow fan hydraulic cylinder, which has the following advantages compared to the hydraulic cylinder installation process:

[0033] This application provides a working simulation device and inspection method for hydraulic cylinders of axial flow fans. The simulation device can intuitively and three-dimensionally display the working state of the hydraulic cylinders of axial flow fans. The hydraulic cylinders to be installed can be inspected by connecting them to the matching oil station before installation. This can avoid installing defective hydraulic cylinders on the equipment. The hidden dangers can be discovered during the trial operation after the entire equipment is installed. This can greatly save labor and time, reduce safety risks, and ensure that the hydraulic cylinders can operate reliably after installation.

[0034] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0035] Figure 1 This is an overall structural diagram of a hydraulic cylinder working simulation device for an axial flow fan according to an embodiment of this application;

[0036] Figure 2 This is a front view of a working simulation device for an axial flow fan hydraulic cylinder according to an embodiment of this application;

[0037] Figure 3 This is a flowchart illustrating the steps of a test method for a working simulation device of an axial flow fan hydraulic cylinder in an embodiment of this application.

[0038] Figure Labels

[0039] 11. First fixed plate; 111. Pointer; 12. Second fixed plate; 13. Base plate; 131. Slide rail; 132. Roller; 21. Loading spring; 22. Adjusting rod; 221. Nut; 23. Lug; 31. Servo valve; 32. Oil inlet hose; 33. Oil return hose; 34. Leakage hose; 35. Connecting block; 4. Oil station mechanism; 41. Oil station; 42. Pressure oil pump; 43. Pressure regulating valve; 44. Oil filter; 45. Pressure gauge; 51. Stroke scale gauge; 52. Thrust scale gauge; 6. Screw jack; 61. Support plate; 62. Screw jack handle; 7. Hydraulic cylinder under test; 8. Fixing bolt; 9. Valve core; 10. Moving trolley. Detailed Implementation

[0040] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] Example:

[0042] like Figure 1 As shown, an axial flow fan hydraulic cylinder working simulation device includes a fixing mechanism, which includes a first fixing plate 11, a second fixing plate 12 and a base plate 13. The fixing mechanism is used to fix the hydraulic cylinder 7 to be tested, which is clamped between the first fixing plate 11 and the second fixing plate 12.

[0043] A set of slide rails 131 is provided on the top of the base plate 13. A roller 132 is rotatably connected to the bottom of the first fixing plate 11. The roller 132 is limited to rolling on the slide rails 131. The second fixing plate 12 is fixed to the top of the base plate 13 and is perpendicular to the slide rails 131.

[0044] It is understandable that the bottom of the second fixing plate 12 can be fixed to the base plate 13 by anchor bolts or by other means. The bottom of the first fixing plate 11 is rotatably connected to a roller 132, which is limited to rolling on the slide rail 131. If other sliding methods are adopted, the displacement of the first fixing plate 11 can be controlled, and it can also be switched. In addition, several transverse grooves can be set on the base plate 13 to adjust the second fixing plate 12 according to the size of the hydraulic cylinder 7 to be tested. The existence of the transverse grooves can make the application range of the axial flow fan hydraulic cylinder working simulation device in this application wider.

[0045] The first fixing plate 11 is provided with a fixing flange on its upper part, and the second fixing plate 12 is also provided with a corresponding fixing flange at the corresponding position. The flange has threads tapped in the screw holes. The fixing flange is provided with fixing bolts 8 between the fixing flange and the cylinder body and piston flange face. The fixing bolts 8 of the fixing flange on the upper part of the first fixing plate 11 are used to fix the piston flange of the hydraulic cylinder 7 under test, and the fixing bolts 8 of the fixing flange on the upper part of the second fixing plate 12 are used to fix the rear cylinder body of the hydraulic cylinder 7 under test.

[0046] The upper surface of the base plate 13 is provided with a spiral top 6, which is located between the first fixed plate 11 and the second fixed plate 12. The top of the spiral top 6 is provided with a support plate 61, which can make the hydraulic cylinder 7 under test more stable to be installed.

[0047] The thrust simulation mechanism includes at least one set of components, including a loading spring 21, an adjusting rod 22, and a hanging lug 23. The adjusting rod 22 is evenly distributed on one side of the first fixed plate 11, and the hanging lug 23 is evenly distributed on one side of the second fixed plate 12. The adjusting rod 22 and the hanging lug 23 are positioned opposite each other and correspond one-to-one. The hanging lug 23 can be fixed by welding or other methods.

[0048] The two ends of the loading spring 21 are connected to the adjusting rod 22 and the lug 23, respectively. The end of the adjusting rod 22 is provided with an external thread, and a nut 221 is fitted on the end of the adjusting rod 22. The nut 221 is located on the side of the first fixed plate 11 and is opposite to the loading spring 21. Rotating the nut 221 can control the length of the adjusting rod 22, thereby driving the adjusting rod 22 to pull the loading spring 21 to extend and retract. Adjusting the force on the loading spring 21 can make the hydraulic cylinder 7 under test subject to force, which simulates the resistance of the blade to the hydraulic cylinder 7 under test. This can further verify the magnitude of the thrust required for the hydraulic cylinder 7 under test to push the blade.

[0049] The valve body control mechanism is located at the front end of the first fixed plate 11 and is connected to the hydraulic cylinder 7 to be tested.

[0050] The valve body control mechanism includes a servo valve 31, an inlet hose 32, a return hose 33, and a leakage hose 34. One end of the servo valve 31 is fixed to the interface end of the hydraulic cylinder 7 under test, and the other end of the servo valve 31 is fixed to a connecting block 35. The connecting block 35 is used to control the opening and closing of the oil port of the servo valve 31. After receiving a signal, the servo valve 31 can output modulated flow and pressure to cause the hydraulic cylinder 7 under test to run and perform work simulation.

[0051] The display mechanism includes a stroke scale 51 and a thrust scale 52, which are used to read the stroke length and thrust of the hydraulic cylinder 7 under test.

[0052] The stroke scale 51 and the thrust scale 52 are arranged side by side at one end of the base plate 13. The bottom of the first fixed plate 11 is provided with a pointer 111, which is used to indicate the stroke length and thrust of the hydraulic cylinder 7 under test. The scales of the stroke scale 51 and the thrust scale 52 can be converted based on known data and do not need to be calculated.

[0053] like Figure 2 As shown, an axial flow fan hydraulic cylinder working simulation device further includes an oil station mechanism 4, which is connected to the valve body control mechanism and is used to supply hydraulic oil to the valve body control mechanism.

[0054] The gas station mechanism 4 includes a gas station 41, a pressure oil pump 42, a pressure regulating valve 43, and an oil filter 44. One end of the inlet hose 32 is fixed to the oil inlet of the servo valve 31, and the other end is fixed to the oil outlet of the pressure oil pump 42. One end of the return hose 33 is fixed to the oil outlet of the servo valve 31, and the other end is fixed to the first oil inlet of the gas station 41. One end of the leakage hose 34 is fixed to the leakage port of the servo valve 31, and the other end is fixed to the second oil inlet of the gas station 41. An oil filter 44 is provided at the oil inlet hose 32 and the oil outlet of the pressure oil pump 42. The pressure regulating valve 43 is fixed to the outlet connecting pipe of the oil pump 42 in the gas station 41. A pressure gauge 45 is provided on the outlet connecting pipe of the oil pump. The pressure gauge 45 is used to observe the pressure of the gas station mechanism 4, start the pressure oil pump 42, and regulate the pressure regulating valve 43 to control the oil pressure of the gas station mechanism 4 to reach the working pressure.

[0055] The hydraulic oil in the oil station mechanism 4 is pumped out by the pressure oil pump 42 and enters the cylinder body through the filter screen, oil inlet pipe and servo valve 31.

[0056] The axial flow fan hydraulic cylinder working simulation device is equipped with a mobile trolley 10, which is used to move the axial flow fan hydraulic cylinder working simulation device between the warehouse and the site.

[0057] Before installing the hydraulic cylinder 7 to be tested, it is inspected by the matching oil station 41 according to the attribute principle. This can ensure that it can operate reliably after installation and reduce unnecessary labor, time and safety risks caused by installing defective hydraulic cylinder 7 to be tested.

[0058] like Figure 3 As shown, a test method for a hydraulic cylinder working simulation device for an axial flow fan includes the following steps: Step 1: Place the hydraulic cylinder 7 to be tested between the first fixed plate 11 and the second fixed plate 12, rotate the handle of the screw jack to lift the hydraulic cylinder 7 to the flange position, and fix the cylinder body. During the installation process, the hydraulic cylinder 7 to be tested should be protected to avoid the final measurement data being affected by personnel behavior.

[0059] Step 2: Fix one end of the loading spring 21 to the lug 23 and hook the other end to the adjusting rod 22. Tighten the adjusting rod 22 by using the nut 221 at the end of the adjusting rod 22 to make the loading spring 21 bear force evenly.

[0060] Step 3: Connect the inlet hose 32, return hose 33, and leakage hose 34 connected to the servo valve 31 of the hydraulic cylinder under test to the oil station mechanism 4.

[0061] Step 4: Start the pressure oil pump 42 on the oil station 41, and adjust the pressure to the working pressure of the hydraulic cylinder 7 under test through the pressure regulating valve 43 and the pressure gauge 45. The hydraulic oil in the oil station 41 is pumped out and enters the hydraulic cylinder 7 under test through the filter screen, oil inlet pipe and servo valve 31.

[0062] Step 5: By pushing and pulling the connecting block 35 at the end of the servo valve 31 of the hydraulic cylinder under test 7, the valve core is moved, and the oil hole of the servo valve 31 is opened and closed, so that the hydraulic oil enters or returns in the front and rear chambers of the piston, pushing or pulling the piston. The piston drives the front fixed plate of the hydraulic cylinder under test 7 to move forward or backward, and the data of the stroke scale 51 and the thrust scale 52 are recorded in real time.

[0063] Step 6: Based on the stroke scale table 51 and the thrust scale table 52, a comprehensive evaluation is performed on the hydraulic cylinder 7 under test to determine whether the hydraulic cylinder 7 under test is reliable and whether it can enter the next process. The comprehensive evaluation includes a qualification evaluation and a stability evaluation.

[0064] Understandably, the results of the conformity assessment can be used to verify whether the stroke, thrust, and leakage of the hydraulic cylinder 7 under test meet the standards. This serves as the basis for determining whether the hydraulic cylinder 7 under test is reliable and can proceed to the next process. Based on the results of the stability assessment, cylinder bodies of the hydraulic cylinder 7 under test with superior quality can be selected.

[0065] The method for evaluating the conformity of the hydraulic cylinder 7 under test according to the thrust scale table 52 includes having a pre-set table of standard thrust values ​​and a table of standard time variation values ​​under different conditions.

[0066] The thrust difference is calculated by comparing the actual thrust value recorded in real time with the standard thrust value under the same conditions. The first evaluation coefficient is then assigned to the thrust difference to obtain the thrust evaluation value.

[0067] Record the actual time change value of the thrust scale reading on the 52. Calculate the time change ratio by comparing the real-time recorded actual time change value with the standard time change value under the same conditions. Then, assign a second evaluation coefficient to the time change ratio to obtain the time change evaluation value.

[0068] Understandably, the speed of change of the scale and time can be used to determine whether the operation of the cylinder under test can quickly change the rotation angle of the wind turbine blades during the operation of the generator set, effectively verifying whether the reliability of the hydraulic cylinder 7 under test meets the function of driving the blades to act according to instructions.

[0069] The pass / fail evaluation value is obtained based on the displayed numerical value and the evaluation value over time.

[0070] In addition, the method for evaluating the stability of the hydraulic cylinder 7 under test based on the display readings recorded by the thrust scale table 52 also includes constructing a model comparison table of the hydraulic cylinder 7 under test, which includes several models of the hydraulic cylinder 7 under test, and a stability testing rule associated with each model of the hydraulic cylinder 7 under test.

[0071] Based on the model of the hydraulic cylinder 7 to be tested, the applicable stability testing rules are determined in the model comparison table of the hydraulic cylinder 7 to be tested. The stability testing rules include several test oil pressures, and for each test oil pressure, there are standard thrust values ​​and standard change time values ​​associated with them.

[0072] According to the stability detection rules determined by the hydraulic cylinder under test 7, the oil station mechanism 4 is driven to reach the detection oil pressure, and the actual thrust value and actual change time value under each detection oil pressure are collected. The thrust difference between the actual thrust value and the standard thrust value, as well as the time difference between the actual change time value and the standard change time value are calculated.

[0073] The stability evaluation of the hydraulic cylinder 7 under test is determined based on the thrust difference and time difference corresponding to each tested oil pressure.

[0074] Understandably, the wear and tear of the hydraulic cylinder 7 under test varies under different conditions, and the maximum limit that the hydraulic cylinder 7 under test can reach also varies under extreme weather conditions. Therefore, it is necessary to test the stability of the hydraulic cylinder 7 under test and put the hydraulic cylinder under test that passes the test into use.

[0075] This application discloses a working simulation device and testing method for an axial flow fan hydraulic cylinder, which has the following advantages compared to the working test of the hydraulic cylinder under test:

[0076] This application provides a working simulation device and inspection method for hydraulic cylinders of axial flow fans. The simulation device can intuitively and three-dimensionally display the working state of the hydraulic cylinders of axial flow fans. The hydraulic cylinders to be installed can be inspected by connecting them to the matching oil station before installation. This can avoid installing defective hydraulic cylinders on the equipment. The hidden dangers can be discovered during the trial operation after the entire equipment is installed. This can greatly save labor and time, reduce safety risks, and ensure that the hydraulic cylinders can operate reliably after installation.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A working simulation device for a hydraulic cylinder of an axial flow fan, characterized in that, include: A fixing mechanism, comprising a first fixing plate, a second fixing plate, and a base plate, is used to fix a hydraulic cylinder under test, wherein the hydraulic cylinder under test is clamped between the first fixing plate and the second fixing plate; A thrust simulation mechanism, wherein at least one set of the simulation mechanism is provided, the simulation mechanism includes a loading spring, an adjusting rod and a hanging lug, the adjusting rod is evenly arranged on one side of the first fixed plate, the hanging lug is evenly arranged on one side of the second fixed plate, and the adjusting rod and the hanging lug are opposite to each other and correspond one-to-one; A valve body control mechanism is located at the front end of the first fixed plate and is connected to the hydraulic cylinder under test. The oil station mechanism is connected to the valve body control mechanism and is used to supply hydraulic oil to the valve body control mechanism. The display mechanism includes a stroke scale and a thrust scale. The stroke scale and thrust scale are used to read the stroke length and thrust of the hydraulic cylinder under test. Based on the thrust scale and stroke scale, a comprehensive evaluation is performed on the hydraulic cylinder under test to determine whether the hydraulic cylinder under test is reliable and whether it can enter the next process. The comprehensive evaluation includes a qualification evaluation and a stability evaluation. A set of slide rails is provided on the top of the base plate. A roller is rotatably connected to the bottom of the first fixed plate. The roller is limited to rolling on the slide rails. The second fixed plate is fixed to the top of the base plate and is perpendicular to the slide rails. The upper surface of the base plate is provided with a spiral top, which is located between the first fixing plate and the second fixing plate, and a support plate is provided on the top of the spiral top; The two ends of the loading spring are respectively connected to the adjusting rod and the lug. The end of the adjusting rod is fitted with a nut. The nut is located at the front end of the first fixing plate and is opposite to the loading spring. The nut is used to drive the adjusting rod to pull the loading spring to extend and retract, thereby adjusting the force on the loading spring. The stroke scale and thrust scale are arranged side by side at one end of the base plate. The bottom of the first fixed plate is provided with a pointer, which is used to indicate the stroke length and thrust of the hydraulic cylinder under test.

2. The axial flow fan hydraulic cylinder working simulation device according to claim 1, characterized in that, The valve body control mechanism includes a servo valve, an inlet hose, a return hose, and a leakage hose. One end of the servo valve is fixedly connected to the interface end of the hydraulic cylinder under test, and the other end of the servo valve is fixedly connected to a connecting block. The connecting block is used to control the opening and closing of the oil port of the servo valve. The gas station system includes a gas station, a pressure oil pump, a pressure regulating valve, and an oil filter. One end of the inlet hose is fixed to the inlet of the servo valve, and the other end is fixed to the outlet of the pressure oil pump. One end of the return hose is fixed to the outlet of the servo valve, and the other end is fixed to the first inlet of the gas station. One end of the leakage hose is fixed to the leakage port of the servo valve, and the other end is fixed to the second inlet of the gas station. Oil filters are provided on the inlet hose and the outlet of the pressure oil pump. The pressure regulating valve is fixed to the outlet connecting pipe of the gas station's oil pump, and a pressure gauge is provided on the outlet connecting pipe of the oil pump.

3. The axial flow fan hydraulic cylinder working simulation device according to claim 2, characterized in that, The axial flow fan hydraulic cylinder working simulation device is equipped with a mobile trolley, which is used to move the axial flow fan hydraulic cylinder working simulation device between the warehouse and the site.

4. A testing method for an axial flow fan hydraulic cylinder working simulation device, applied to the axial flow fan hydraulic cylinder working simulation device of claim 3, characterized in that, include: Step 1: Place the hydraulic cylinder to be tested between the first fixed plate and the second fixed plate, turn the handle of the screw jack to lift the hydraulic cylinder to the flange position, and fix the cylinder body in place. Step 2: Fix one end of the loading spring to the lug and hook the other end to the adjusting rod. Tighten the adjusting rod by tightening the nut at the end of the adjusting rod to make the spring evenly stressed. Step 3: Connect the inlet hose, return hose, and leakage hose connected to the servo valve of the hydraulic cylinder under test to the oil station mechanism; Step 4: Start the oil station pressure pump, and adjust the pressure to the working pressure of the hydraulic cylinder to be tested through the pressure regulating valve and pressure gauge. The hydraulic oil in the oil station is pumped out and enters the hydraulic cylinder to be tested through the filter screen, oil inlet pipe and servo valve. Step 5: By pushing and pulling the connecting block at the end of the servo valve of the hydraulic cylinder under test, the valve core is moved, and the oil hole of the servo valve is opened and closed, so that the hydraulic oil enters or returns in the front and rear chambers of the piston, pushing or pulling the piston. The piston drives the front fixed plate of the hydraulic cylinder to move forward or backward, and the stroke scale and thrust scale data are recorded in real time. Step 6: Based on the thrust scale and stroke scale, conduct a comprehensive evaluation of the hydraulic cylinder under test to determine whether the hydraulic cylinder under test is reliable and whether it can enter the next process. The comprehensive evaluation includes a qualification evaluation and a stability evaluation.

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