Experimental system for testing rocker arm gear of coal mining machine under action of alternating load

Abstract

The invention relates to the technical field of coal mining equipment testing, and discloses a coal mining machine rocker arm gear testing experiment system under the action of alternating load, which comprises a supporting mechanism, the supporting platform is rotatably arranged on the supporting mechanism; the first driving mechanism abuts against the supporting platform and is used for driving the supporting platform to rotate along the supporting mechanism. The rocker arm gear mechanism is arranged on the supporting platform; the second driving mechanism is arranged on the supporting platform and connected with the rocker arm gear mechanism. The load mechanism is arranged on the supporting platform and connected with the rocker arm gear mechanism. The processing module is used for obtaining the performance parameters of the rocker arm gear mechanism and judging the operation state of the rocker arm gear mechanism based on the performance parameters, the cyclic alternating load of the rocker arm of the coal mining machine under the actual working condition can be simulated, a scientific basis is provided for maintenance of the coal mining machine, and the unnecessary maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining equipment testing, and particularly to a testing experimental system for a shearer rocker arm gear under alternating loads. Background Art

[0002] During the coal mining process, as a key piece of equipment, the performance of the shearer directly affects the mining efficiency and safety. As one of the core components of the shearer, the operating state of the rocker arm gear directly affects the overall performance of the shearer. However, due to the harsh working environment, the rocker arm gear is prone to failures such as wear and fracture under alternating loads, resulting in a decline in the performance of the shearer or even shutdown. Therefore, it is particularly crucial to test the performance of the rocker arm gear under alternating loads.

[0003] Currently, most of the testing methods for shearer rocker arm gears adopt static testing or simple dynamic testing, which cannot accurately simulate the complex and variable alternating load environment in actual operations and do not have the ability of dynamic real-time monitoring, resulting in the test results being difficult to accurately reflect the fatigue and wear characteristics of the gears. Summary of the Invention

[0004] The purpose of the present invention is to provide a testing experimental system for a shearer rocker arm gear under alternating loads, aiming to solve or improve at least one of the above technical problems.

[0005] To achieve the above purpose, the present invention provides the following solution: The present invention provides a testing experimental system for a shearer rocker arm gear under alternating loads, including:

[0006] A support mechanism;

[0007] A support platform rotatably arranged on the support mechanism;

[0008] A first driving mechanism abutted against the support platform for driving the support platform to rotate along the support mechanism;

[0009] A rocker arm gear mechanism arranged on the support platform;

[0010] A second driving mechanism arranged on the support platform, the second driving mechanism being connected to the rocker arm gear mechanism;

[0011] A load mechanism arranged on the support platform, the load mechanism being connected to the rocker arm gear mechanism;

[0012] A processing module for obtaining the performance parameters of the rocker arm gear mechanism and judging the operating state of the rocker arm gear mechanism based on the performance parameters.

[0013] Optionally, the support mechanism includes:

[0014] Support frame;

[0015] A pair of fixing holes are formed on the support frame, and the support platform is rotatably connected to the pair of fixing holes through a fixing seat;

[0016] A pair of sliding grooves are formed on the support frame, and the support platform is slidably connected to the pair of sliding grooves through a fixing seat;

[0017] A plurality of locking members are used to lock the positions of the fixing seat and the fixing holes and the fixing seat on the sliding grooves.

[0018] Optionally, the locking member includes a connecting bolt and a bolt sleeve arranged on the connecting bolt, and a plurality of limiting holes are formed on the sliding groove, and the limiting holes are used to accommodate the bolt sleeve.

[0019] Optionally, the first driving mechanism includes:

[0020] A hydraulic cylinder barrel with a piston rod arranged at the output end;

[0021] A fixing frame is rotatably connected to the piston rod through a connecting column;

[0022] A support plate is connected to the fixing frame, and the support plate is used to abut against the support platform;

[0023] A driving pressure rod is connected to the hydraulic cylinder barrel.

[0024] Optionally, the rocker gear mechanism includes:

[0025] A box body is connected to the support platform through a first connecting seat;

[0026] A first gear is rotatably connected to the box body through a first shaft rod, a first support plate and a first bearing, and the first shaft rod is connected to the second driving mechanism;

[0027] A second gear is rotatably connected to the box body through a second shaft rod, a second support plate and a second bearing, and the second gear meshes with the first gear;

[0028] A first transmission gear is rotatably connected to the box body through a third shaft rod, a third support plate and a third bearing, the first transmission gear meshes with the second gear, and a second transmission gear is arranged on the third shaft rod;

[0029] A first idler gear is rotatably connected to the box body through a fourth shaft rod, a fourth support plate and a fourth bearing, and the first idler gear meshes with the second transmission gear;

[0030] The second idler wheel is rotatably connected to the box body through a fifth shaft rod, a fifth support plate and a fifth bearing, and the second idler wheel meshes with the first idler wheel;

[0031] The third idler wheel is rotatably connected to the box body through a sixth shaft rod, a sixth support plate and a sixth bearing, and the third idler wheel meshes with the second idler wheel;

[0032] The third gear is rotatably connected to the box body through a seventh shaft rod, a seventh support plate and a seventh bearing, the third gear meshes with the third idler wheel, and the seventh shaft rod is connected to the load mechanism.

[0033] Optionally, the second driving mechanism includes:

[0034] A driving motor is connected to the support platform through a second connecting seat;

[0035] A first flexible coupling is used to connect the output end of the driving motor and the first shaft rod.

[0036] Optionally, the load mechanism includes:

[0037] A magnetic particle brake is connected to the support platform through a third connecting seat;

[0038] A second flexible coupling is used to connect the output end of the magnetic particle brake and the seventh shaft rod.

[0039] Optionally, an anti-slip pad is provided on the support plate.

[0040] Optionally, the support frame is made of cast iron.

[0041] Optionally, the box body is made of carbon structural steel.

[0042] The present invention discloses the following technical effects:

[0043] 1. The present invention can drive the support platform to rotate along the support mechanism through the first driving mechanism, adjust the inclination angle of the support platform, and drive the rocker gear mechanism to operate in cooperation with the load mechanism through the second driving mechanism to simulate the cyclic alternating load under the actual working conditions of the shearer rocker arm.

[0044] 2. The present invention can more accurately evaluate the performance of the shearer rocker arm gear, improve the accuracy of the test results. By the processing module, the operation state of the rocker gear mechanism is monitored in real time and fault diagnosis is carried out. The present invention can timely detect potential faults, avoid the expansion of faults, thereby enhancing the reliability of the system, providing a scientific basis for the maintenance of the shearer, and reducing unnecessary maintenance costs.

[0045] 3. The present invention helps to reduce energy consumption and emissions, and promotes energy conservation, emission reduction and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0047] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0048] Figure 2 is a schematic diagram of the upper structure of the support platform of the present invention;

[0049] Figure 3 is a schematic diagram of the rocker arm gear mechanism of the present invention;

[0050] Figure 4 is a schematic diagram of the support mechanism of the present invention;

[0051] Figure 5 is a schematic diagram of the first driving mechanism of the present invention;

[0052] Figure 6 is a schematic diagram of the locking member of the present invention.

[0053] In the figure: 1. Rocker arm gear mechanism; 2. First connecting seat; 3. Driving motor; 4. Second connecting seat; 5. Support mechanism; 6. Magnetic powder brake; 7. Third connecting seat; 8. First driving mechanism; 9. Fixed seat; 10. Third bearing; 11. Fourth support plate; 12. Fifth support plate; 13. Sixth support plate; 14. Seventh bearing; 15. Support platform; 16. First flexible coupling; 17. First support plate; 18. Second support plate; 19. Third support plate; 20. Fourth shaft rod; 21. Fifth shaft rod; 22. Sixth shaft rod; 23. Box body; 24. Third gear; 25. Third idler gear; 26. Second idler gear; 27. First idler gear; 28. First transmission gear; 29. Second transmission gear; 30. Second gear; 31. First gear; 32. First shaft rod; 33. First bearing; 34. Second shaft rod; 35. Fifth bearing; 36. Seventh support plate; 37. Seventh shaft rod; 38. Chute; 39. Limit hole; 40. Support frame; 41. Fixed hole; 42. Support plate; 43. Connecting column; 44. Piston rod; 45. Hydraulic cylinder barrel; 46. Fixed frame; 47. Driving pressure rod; 48. Bolt sleeve; 49. Connecting bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0054] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0055] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] Referring to Figures 1 - 6 , the present invention provides a test experiment system for a rocker arm gear of a shearer under alternating loads, including:

[0057] A support mechanism 5;

[0058] A support platform 15 rotatably arranged on the support mechanism 5;

[0059] A first driving mechanism 8 abutted against the support platform 15 for driving the support platform 15 to rotate along the support mechanism 5;

[0060] A rocker arm gear mechanism 1 arranged on the support platform 15;

[0061] A second driving mechanism arranged on the support platform 15, and the second driving mechanism is connected to the rocker arm gear mechanism 1;

[0062] A load mechanism arranged on the support platform 15, and the load mechanism is connected to the rocker arm gear mechanism 1;

[0063] A processing module for obtaining the performance parameters of the rocker arm gear mechanism 1 and judging the operation state of the rocker arm gear mechanism based on the performance parameters.

[0064] Through the first driving mechanism 8, the support platform 15 can be driven to rotate along the support mechanism 5 to adjust the inclination angle of the support platform 15, and the rocker arm gear mechanism 1 is driven by the second driving mechanism to operate in cooperation with the load mechanism to simulate the cyclic alternating load under the actual working conditions of the shearer rocker arm. The present invention can more accurately evaluate the performance of the shearer rocker arm gear, improve the accuracy of the test results. By the processing module, the operation state of the rocker arm gear mechanism 1 is monitored in real time and fault diagnosis is carried out. The present invention can timely detect potential faults, avoid the expansion of faults, thereby enhancing the reliability of the system, providing a scientific basis for the maintenance of the shearer, and reducing unnecessary maintenance costs.

[0065] Furthermore, the processing module includes multiple high-precision sensors and a computer, which are installed on each gear within the rocker arm gear mechanism 1 and are used to monitor key parameters of the gears such as rotational speed, torque, vibration, temperature, etc., as well as key parameters of the oil in real time, including abrasive concentration, abrasive size distribution, viscosity, moisture content, temperature, density, etc., so as to accurately reflect the operating state of the gearbox. The data acquisition card converts the signals collected by the sensors into digital signals and stores them in the computer. The data processing system in the computer uses advanced signal processing algorithms (such as EMD processing, wavelet transform, etc.) to filter, denoise, and extract features from the collected signals. The neural network diagnosis technology is adopted to perform pattern recognition on the extracted features to achieve accurate diagnosis of gear faults.

[0066] Furthermore, the multiple high-precision sensors include: an abrasive sensor, which uses a high-precision on-line ferrograph abrasive sensor to monitor the abrasive concentration and size distribution in the oil in real time based on the principle of electromagnetic induction. When the gear wears, the abrasive concentration and size distribution will change accordingly. Combining with the analysis of the abrasive morphology, normal wear, fatigue wear, and severe wear (such as spalling, pitting, etc.) can be identified. By analyzing the time-series data, an evolution model of the abrasive concentration changing with the load is established to identify the gear wear modes at different stages. A viscosity sensor, which uses an on-line dynamic viscosity sensor to measure the oil viscosity in real time by the oscillating tube method. A decrease in viscosity may mean lubricant aging, shear thinning, or contamination, while an abnormal increase in viscosity may be related to particle contamination or emulsification. By the trend of the oil viscosity changing with time and load, the deterioration of the lubricant is judged, and the gear wear state is evaluated in combination with the abrasive data. A moisture content sensor, which uses a capacitance method or impedance method moisture content sensor to monitor the moisture content in the oil in real time. The working environment of the shearer is humid, and the lubricating oil is extremely vulnerable to water pollution. The increase in moisture may cause the oil film to rupture, lubrication failure, and accelerate gear wear and pitting. Combining with the changes in abrasive concentration and viscosity, the impact of water pollution on the lubrication state of the gearbox is judged. A temperature sensor, which uses a high-precision thermocouple or PT100 temperature sensor to monitor the lubricating oil temperature of the gearbox. The change in temperature is closely related to the gear friction state. An abnormal increase may mean insufficient lubrication, increased friction, or excessive load. Combining with the oil viscosity and abrasive concentration data, the health state of the gearbox is evaluated.

[0067] In an embodiment of the present invention, the support mechanism 5 includes:

[0068] A support frame 40;

[0069] A pair of fixing holes 41, which are opened on the support frame 40, and the support platform 15 is rotatably connected to the pair of fixing holes 41 through the fixing seat 9;

[0070] A pair of sliding grooves 38, which are opened on the support frame 40, and the support platform 15 is slidably connected to the pair of sliding grooves 38 through the fixing seat 9;

[0071] Multiple locking members for locking the positions of the fixing base 9 with the fixing holes 41 and the fixing base 9 on the sliding groove 38.

[0072] One end of the support platform 15 is defined by the positions of a pair of fixing holes 41, and the support platform 15 is driven by the first driving mechanism 8 to rotate about the positions of the fixing holes 41 as pivot points and locked by the locking members, thereby realizing the height adjustment of the support platform 15 and simulating the working conditions of the rocker arm of the shearer at different inclination angles.

[0073] In an embodiment of the present invention, the locking member includes a connecting bolt 49 and a bolt sleeve 48 provided on the connecting bolt 49. A plurality of limiting holes 39 are formed on the sliding groove 38, and the limiting holes 39 are used to accommodate the bolt sleeve 48.

[0074] The connecting bolt 49 cooperates with a nut to achieve the locking effect.

[0075] In an embodiment of the present invention, the first driving mechanism 8 includes:

[0076] A hydraulic cylinder barrel 45 with a piston rod 44 provided at the output end;

[0077] A fixing frame 46 rotatably connected to the piston rod 44 through a connecting column 43;

[0078] A support plate 42 connected to the fixing frame 46, and the support plate 42 is used to abut against the support platform 15;

[0079] A driving lever 47 connected to the hydraulic cylinder barrel 45.

[0080] The hydraulic cylinder barrel 45 is driven by the driving lever 47 to drive the piston rod 44, so that the piston rod 44 drives the fixing frame 46, and the support plate 42 on the fixing frame 46 pushes the support platform 15 to rotate to meet the requirements of different test working conditions. The hydraulic cylinder barrel 45 and the piston rod 44 can also be used as a self-locking safety device. When the test is working normally, the piston rod 44 is adjusted to a certain height to keep abutting against the support platform 15 to prevent the support platform 15 from suddenly falling.

[0081] In an embodiment of the present invention, the rocker arm gear mechanism 1 includes:

[0082] A box body 23 connected to the support platform 15 through a first connecting seat 2;

[0083] A first gear 31 rotatably connected to the box body 23 through a first shaft rod 32, a first support plate 17 and a first bearing 33, and the first shaft rod 32 is connected to a second driving mechanism;

[0084] The second gear 30 is rotatably connected to the box body 23 through a second shaft rod 34, a second support plate 18 and a second bearing. The second gear 30 meshes with the first gear 31;

[0085] The first transmission gear 28 is rotatably connected to the box body 23 through a third shaft rod, a third support plate 19 and a third bearing 10. The first transmission gear 28 meshes with the second gear 30, and a second transmission gear 29 is arranged on the third shaft rod;

[0086] The first idler gear 27 is rotatably connected to the box body 23 through a fourth shaft rod 20, a fourth support plate 11 and a fourth bearing. The first idler gear 27 meshes with the second transmission gear 29;

[0087] The second idler gear 26 is rotatably connected to the box body 23 through a fifth shaft rod 21, a fifth support plate 12 and a fifth bearing 35. The second idler gear 26 meshes with the first idler gear 27;

[0088] The third idler gear 25 is rotatably connected to the box body 23 through a sixth shaft rod 22, a sixth support plate 13 and a sixth bearing. The third idler gear 25 meshes with the second idler gear 26;

[0089] The third gear 24 is rotatably connected to the box body 23 through a seventh shaft rod 37, a seventh support plate 36 and a seventh bearing 14. The third gear 24 meshes with the third idler gear 25, and the seventh shaft rod 37 is connected to the load mechanism.

[0090] The internal structure of the rocker arm gear mechanism 1 can be flexibly configured and is suitable for the rocker arm gear measurement of shearers of different models and specifications.

[0091] The first gear 31, the second gear 30, the first transmission gear 28, the second transmission gear 29, the first idler gear 27, the second idler gear 26, the third idler gear 25 and the third gear 24 can simulate the complex transmission path of the actual shearer rocker arm to ensure the accuracy of the test results.

[0092] In an embodiment of the present invention, the second driving mechanism includes:

[0093] The driving motor 3 is connected to the support platform 15 through a second connecting seat 4;

[0094] The first flexible coupling 16 is used to connect the output end of the driving motor 3 and the first shaft rod 32.

[0095] The driving motor 3 drives the first shaft rod 32 to rotate through the first flexible coupling 16, so as to make the rocker arm gear mechanism 1 operate.

[0096] In an embodiment of the present invention, the load mechanism includes:

[0097] The magnetic powder brake 6 is connected to the support platform 15 through the third connecting seat 7;

[0098] The second flexible coupling is used to connect the output end of the magnetic powder brake 6 and the seventh shaft rod 37.

[0099] The magnetic powder brake 6 simulates the dynamic load changes suffered by the shearer during the actual working process.

[0100] In an embodiment of the present invention, an anti-slip pad is provided on the support plate 42, and the anti-slip pad can prevent the support plate 42 from slipping when it comes into contact with the support platform 15.

[0101] In an embodiment of the present invention, the support frame 40 is made of cast iron, with a stable overall structure and is fixed to the ground.

[0102] In an embodiment of the present invention, the box body 23 is made of carbon structural steel, having sufficient stiffness and strength to withstand various loads and vibrations during the test process.

[0103] Furthermore, the upper side plate and the left side plate of the box body 23 are made of 10mm high-strength acrylic plates, which is convenient for observing the internal gear transmission situation.

[0104] Furthermore, the drive motor 3 is a servo motor with a power of 600W, a rated torque of 1.91 Nm, and a rated speed of 3000 revolutions. It is controlled by a frequency converter and can accurately adjust the speed and torque output.

[0105] Furthermore, the magnetic powder brake 6 is selected as a single-axis brake PB-2.5 Kg (25 Nm) to meet the actual working load conditions of the shearer rocker arm gear. The magnetic powder brake 6 is used to adjust different loads, simulate the load changes of the shearer rocker arm gearbox under different working conditions, set different working conditions (light load, medium load, heavy load, sudden load, etc.), and test the oil characteristics changes of the gear under complex working conditions.

[0106] Simulate the experimental process of cutting coal when the shearer rocker arm is in a 30-degree downcutting angle. Press the drive lever 47 to continuously raise the piston rod 44. The support plate 42 drives the support platform 15 to rise. Adjust the bolt sleeve 48 to the appropriate limit hole 39 of the support mechanism 5, and tighten the nut to fix it. At this time, the entire rocker arm gear mechanism 1 is at a 30-degree height from the ground. Start the drive motor 3 and the magnetic powder brake 6 to simulate the operation situation inside the rocker arm gear of the shearer when cutting the coal seam at a large angle.

[0107] It is quite common that the downcut angle of a shearer ranges from 20 degrees to 30 degrees. Simulate the experimental process of cutting coal when the downcut angle of the shearer's rocker arm is 20 degrees. Drive the push rod 47 to continuously raise the piston rod 44, the support plate 42 drives the support platform 15 to rise, adjust the bolt sleeve 48 to the appropriate limit hole 39 of the support mechanism 5, tighten the nut to fix it, so that the height of the rocker arm gear mechanism 1 from the ground is 20 degrees, start the drive motor 3 and the magnetic powder brake 6, and simulate the operation of the rocker arm gear when the downcut angle of the shearer is 20 degrees.

[0108] Before the test starts, inject an appropriate amount of lubricating oil into the rocker arm gear mechanism 1. Measuring points (such as measuring point A, measuring point B, etc.) are set on the outer side of each gear inside the rocker arm gear mechanism 1, which are used to collect signals such as vibration and temperature during the gear operation. The data acquisition system in the computer collects key parameters such as the stress and temperature of each gear in real time and transmits them to the analysis software for processing. By analyzing these data, evaluate the performance of the gears under various conditions that may be encountered in the actual working environment.

[0109] Test procedure

[0110] (1) Specimen preparation: Select gear samples with different materials and heat treatment states.

[0111] (2) Loading test: Set different alternating load conditions (light load - medium load - heavy load - sudden load), and run the gearbox test system.

[0112] (3) Oil monitoring: Record data such as abrasive particles, viscosity, moisture content, temperature, etc. in real time, and analyze the changing trend of oil parameters in combination with the working conditions.

[0113] (4) Data analysis: Compare the oil characteristics under different loads, and analyze the correlation between the oil characteristics and the gear health status in combination with the gear wear data.

[0114] (5) Health assessment: Use machine learning algorithms to build a health assessment model to realize the prediction of gear wear status.

[0115] 4. Expected results

[0116] (1) Master the lubrication status of the gearbox in real time, and realize the dynamic assessment of the lubricating oil status through the monitoring of the physical and chemical characteristics of the oil.

[0117] (2) Identify different wear modes, and use the analysis of abrasive particle sensor data to analyze the normal wear, fatigue wear, pitting and abnormal failures of gears.

[0118] (3) Realize fault early warning, combine parameters such as viscosity, moisture content, temperature, etc., establish a gear health status evaluation system, and realize early warning.

[0119] (4) Several optimized maintenance strategies are adopted to reasonably formulate a lubrication management plan based on oil monitoring data, thereby prolonging the service life of gears.

[0120] Through the oil monitoring technology of multi-sensor fusion, the present invention realizes the wear state evaluation of the rocker arm gearbox of a shearer under alternating loads, providing technical support for the intelligent operation and maintenance of underground equipment. The research results can be popularized and applied in fields such as coal mining machinery, wind power gearboxes, and high-end equipment manufacturing, improving the operational reliability of equipment and reducing maintenance costs.

[0121] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, 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 should not be construed as a limitation to the present invention.

[0122] The above-described embodiments are only descriptions of the preferred modes of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A coal mining machine rocker gear test experimental system under alternating load, characterized in that: include: Support mechanism (5); A supporting platform (15) rotatably disposed on the supporting mechanism (5); A first driving mechanism (8) abuts against the supporting platform (15) and is used to drive the supporting platform (15) to rotate along the supporting mechanism (5); A rocker gear mechanism (1) is arranged on the supporting platform (15); A second driving mechanism is disposed on the supporting platform (15), and the second driving mechanism is connected to the rocker gear mechanism (1); A load mechanism, disposed on the support platform (15), the load mechanism being connected to the rocker gear mechanism (1); A processing module is used to obtain performance parameters of the rocker arm gear mechanism and determine the operating state of the rocker arm gear mechanism based on the performance parameters.

2. The coal mining machine rocker gear test experimental system under alternating load according to claim 1, characterized in that: The supporting mechanism (5) comprises: Support frame (40); A pair of fixing holes (41) are provided on the support frame (40), and the support platform (15) is rotatably connected to the pair of fixing holes (41) via a fixing seat (9); A pair of slide grooves (38) are provided on the support frame (40), and the support platform (15) is slidably connected to the pair of slide grooves (38) via a fixed seat (9); A plurality of locking members are used to lock the fixing seat (9) and the fixing hole (41) as well as the position of the fixing seat (9) on the sliding groove (38).

3. The coal mining machine rocker gear test experimental system under alternating load according to claim 2, characterized in that: The locking member comprises a connecting bolt (49) and a bolt sleeve (48) arranged on the connecting bolt (49); a plurality of limiting holes (39) are provided on the sliding groove (38); and the limiting holes (39) are used to accommodate the bolt sleeve (48).

4. The coal mining machine rocker gear test experimental system under alternating load according to claim 1, characterized in that: The first driving mechanism (8) comprises: A hydraulic cylinder (45) having a piston rod (44) disposed at the output end; A fixed frame (46) rotatably connected to the piston rod (44) via a connecting column (43); A support plate (42) connected to the fixing frame (46), the support plate (42) being used to abut against the supporting platform (15); A driving pressure rod (47) is connected to the hydraulic cylinder (45).

5. The coal mining machine rocker gear test experimental system under alternating load according to claim 1, characterized in that: The rocker gear mechanism (1) comprises: The box body (23) is connected to the supporting platform (15) via the first connecting seat (2); A first gear (31) is rotatably connected to the housing (23) via a first shaft (32), a first support plate (17) and a first bearing (33), wherein the first shaft (32) is connected to the second driving mechanism; a second gear (30) rotatably connected to the housing (23) via a second shaft (34), a second support plate (18) and a second bearing, the second gear (30) being meshed with the first gear (31); A first transmission gear (28) is rotatably connected to the housing (23) via a third shaft, a third support plate (19) and a third bearing (10), the first transmission gear (28) is meshed with the second gear (30), and the third shaft is provided with a second transmission gear (29); A first idler wheel (27) is rotatably connected to the housing (23) via a fourth shaft (20), a fourth support plate (11) and a fourth bearing, and the first idler wheel (27) is meshed with the second transmission gear (29); A second idler wheel (26) is rotatably connected to the housing (23) via a fifth shaft (21), a fifth support plate (12) and a fifth bearing (35), and the second idler wheel (26) is meshed with the first idler wheel (27); A third idler wheel (25) is rotatably connected to the housing (23) via a sixth shaft (22), a sixth support plate (13) and a sixth bearing, and the third idler wheel (25) is meshed with the second idler wheel (26); The third gear (24) is rotatably connected to the housing (23) via a seventh shaft (37), a seventh support plate (36) and a seventh bearing (14); the third gear (24) is meshed with the third idler wheel (25); and the seventh shaft (37) is connected to the load mechanism.

6. The coal mining machine rocker gear test experimental system under alternating load according to claim 5, characterized in that: The second driving mechanism comprises: A driving motor (3) connected to the supporting platform (15) via a second connecting seat (4); The first flexible coupling (16) is used to connect the output end of the driving motor (3) and the first shaft (32).

7. The coal mining machine rocker gear test experimental system under alternating load according to claim 5, characterized in that: The load mechanism comprises: A magnetic powder brake (6) is connected to the support platform (15) via a third connecting seat (7); The second flexible coupling is used to connect the output end of the magnetic powder brake (6) and the seventh shaft (37).

8. The coal mining machine rocker gear test experimental system under alternating load according to claim 4, characterized in that: An anti-slip pad is provided on the supporting plate (42).

9. The coal mining machine rocker gear test experimental system under alternating load according to claim 2, characterized in that: The support frame (40) is made of cast iron.

10. The coal mining machine rocker gear test experimental system under alternating load according to claim 5, characterized in that: The box body (23) is made of carbon structural steel.

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