Fan transmission chain all-condition load test device and test method

Abstract

The invention discloses a fan transmission chain full-condition load test device and method, and the device comprises a main test side transmission chain, an auxiliary test side transmission chain, a connecting device, a hydraulic locking device, and an electric slip ring assembly, and the connecting device is disposed between the auxiliary test side transmission chain and the main test side transmission chain. The connecting device is arranged on the main test side transmission chain and used for transmitting torsional moment to the main test side transmission chain, generating bending moment and force and simulating hub center moment and force, the hydraulic locking device is arranged on the main test side transmission chain and the connecting device and used for connecting and fixing the main test side transmission chain, and the electric slip ring assembly is arranged at the bottom of the connecting device and used for transmitting electric power and control information. According to the invention, the simulation test of the limit load, the fatigue load, the acceleration load or the load of any selected working condition of the fan can be realized, and the test efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power, and in particular relates to a full-operating load test device and a test method for a wind turbine transmission chain. Background Art

[0002] The fan drive chain is generally designed based on the hub center limit load and fatigue load, such as Figure 1 As shown, the center load of the fan hub generally includes 6 types of loads: MX, MY, MZ, FX, FY, and FZ. Considering positive and negative loads, interference and gravity conditions, there are a total of 13 load channels.

[0003] In the prior art, most wind turbine transmission chain tests are mainly based on simulating the rotating load MX, or simulating the bending moment of the MY and MZ channel loads by adding a hydraulic cylinder that has no relative motion with the ground. It is not possible to simulate the loads of the FX, FY, and FZ channels. Since the test spindle and the main test spindle are mostly rigidly connected, the MZ bending moment generated by the hydraulic cylinder that has no relative motion with the ground acts on the entire test transmission chain. The main test side transmission chain and the accompanying test side transmission chain may be subjected to MZ at the same time, and the torque of the MZ channel of the main test part cannot be accurately determined.

[0004] During the connection, a large number of high-strength and large-diameter bolts or studs are used to connect the main test spindle, the spindle connection device and the accompanying test spindle. During the test, they need to be repeatedly disassembled and assembled, wasting a lot of time and energy. At the same time, high-strength bolts are not suitable for repeated disassembly and assembly. In order to ensure the reliability of the product fasteners, a batch of test fasteners must be specially prepared, which increases the cost. Summary of the invention

[0005] In order to at least partially solve the technical problems existing in the above-mentioned prior art, the present invention provides a full-operating load test device and test method for a fan transmission chain.

[0006] In one aspect of the present invention, a full-operation load test device for a wind turbine transmission chain is provided, which includes a main test side transmission chain, a companion test side transmission chain, a connecting device, a hydraulic locking device and an electric slip ring assembly. The connecting device is arranged between the companion test side transmission chain and the main test side transmission chain, and is used to transmit torsional torque to the main test side transmission chain, and to apply bending moment and force to the main test side transmission chain to simulate the hub center bending moment and force in actual operation. The hydraulic locking device is arranged on the main test side transmission chain and the connecting device, and is used to connect and fix the main test side transmission chain. The electric slip ring assembly is arranged at the bottom of the connecting device, and is used to transmit power and control information to the connecting device, wherein:

[0007] The connecting device includes a drum-shaped gear sleeve, a T-shaped connecting sleeve, a Z-shaped connecting sleeve and a hydraulic cylinder group. The T-shaped connecting sleeve is sleeved on one end of the drum-shaped gear sleeve, and the Z-shaped connecting sleeve is sleeved on the other end of the drum-shaped gear sleeve. The T-shaped connecting sleeve and the Z-shaped connecting sleeve are arranged correspondingly, and the hydraulic cylinder group is arranged in no less than three groups along the circumference between the T-shaped connecting sleeve and the Z-shaped connecting sleeve.

[0008] Furthermore, in the above-mentioned full-condition load test device for the fan transmission chain, the two ends of the drum-shaped gear sleeve are respectively abutted against the main test side transmission chain and the accompanying test side transmission chain, the first drum-shaped teeth are symmetrically arranged on the outer side of the circumference of the two ends of the drum-shaped gear sleeve, the second drum-shaped teeth are arranged on the inner side of the T-shaped connecting sleeve, and the third drum-shaped teeth are arranged on the inner side of the Z-shaped connecting sleeve, and the second drum-shaped teeth and the third drum-shaped teeth are respectively meshed with the first drum-shaped teeth.

[0009] Furthermore, in the above-mentioned fan transmission chain full-condition load test device, the hydraulic cylinder group includes a radial hydraulic cylinder and an axial hydraulic cylinder. The radial hydraulic cylinder is radially installed on the inner side of the T-shaped connecting sleeve along the rotating axis, and the axial hydraulic cylinder is axially installed on the outer side of the T-shaped connecting sleeve along the rotating axis. The output ends of the radial hydraulic cylinder and the axial hydraulic cylinder are both connected to the Z-shaped connecting sleeve.

[0010] Furthermore, in the above-mentioned wind turbine transmission chain full-operating load test device, the outer end surface of the T-type connecting sleeve is fixedly connected to the companion test side transmission chain through bolts, and the outer end surface of the Z-type connecting sleeve is fixedly connected to the main test side transmission chain through the hydraulic locking device.

[0011] Furthermore, in the above-mentioned wind turbine transmission chain full-condition load test device, the electric slip ring assembly includes a brush and a slip ring, the brush is fixedly mounted on the test platform, the slip ring is fixed on the outer side of the circumference of the T-shaped connecting sleeve, the slip ring input end is electrically connected to the brush, and the slip ring output end is electrically connected to the hydraulic cylinder group.

[0012] In another aspect of the present invention, a method for full-operating load test of a wind turbine transmission chain is provided, comprising the following steps:

[0013] Step 1: According to the parameters and layout of the test device, the conversion relationship between the central load of the fan hub and the tension and pressure of the hydraulic cylinder group is obtained, and appropriate control conditions are added according to the parameters and layout of the test device. After the conversion relationship and the control conditions are combined, the equation group has a unique solution;

[0014] Step 2: Combine the conversion relationship with the control conditions to obtain the conversion matrix between the center load of the fan hub and the tension and pressure of the hydraulic cylinder group and the torque of the transmission chain motor on the test side;

[0015] Step 3: Use the conversion matrix to convert the ultimate load, fatigue load, accelerated fatigue load or any working load to be tested into the corresponding hydraulic cylinder group tension and pressure and the test side transmission chain motor torque;

[0016] Step 4: The converted timing file of the tension or pressure of the hydraulic cylinder group and the timing file of the transmission chain motor on the test side are converted into electrical signals by the control system, and the electrical power and electrical signals are directly input to the transmission chain motor on the test side, and the electrical power and electrical signals are input to the hydraulic cylinder group through the electric slip ring assembly;

[0017] Step 5: Record and collect the test data of the transmission chain on the main test side, and conduct static, fatigue or dynamic studies.

[0018] The wind turbine transmission chain full-operating load test device and test method of the present invention have the following advantages and beneficial effects:

[0019] The present invention realizes a complete simulation of the ultimate load of the fan hub through the push and pull of multiple hydraulic cylinders, and can control the real-time change of the load at the same time, thereby realizing the simulation test of the ultimate load, fatigue load, accelerated fatigue load or any selected working load of the fan. The setting of the hydraulic locking device effectively realizes the rapid replacement of the main test side transmission chain, which effectively improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings in the following descriptions are only used to further understand the embodiments of the present invention and constitute a part of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0021] Figure 1 This is a schematic diagram of the central rotation load of the fan hub;

[0022] Figure 2 It is a front view of the full-operating load test device for the fan transmission chain of the present invention;

[0023] Figure 3 A top view of the full-operating load test device for the fan transmission chain of the present invention;

[0024] Figure 4 It is an enlarged structural schematic diagram of the connection device of the full-operating load test device for the fan transmission chain of the present invention.

[0025] Description of reference numerals:

[0026] 100: test platform;

[0027] 2: Transmission chain on the main test side; 3: Transmission chain on the accompanying test side;

[0028] 4: connecting device, 41: drum gear sleeve, 42: first drum gear, 43: T-type connecting sleeve, 44: second drum gear, 45: Z-type connecting sleeve, 46: third drum gear, 47: hydraulic cylinder group, 48: radial hydraulic cylinder, 49: axial hydraulic cylinder;

[0029] 5: Hydraulic locking device;

[0030] 6: Electric slip ring assembly, 61: Brush, 62: Slip ring. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] like Figures 2 to 4 As shown, one aspect of the present invention provides a full-operation load test device for a wind turbine transmission chain, including a main test side transmission chain 2, a companion test side transmission chain 3, a connecting device 4, a hydraulic locking device 5 and an electric slip ring assembly 6. The connecting device 4 is arranged between the companion test side transmission chain 3 and the main test side transmission chain 2, and is used to transmit the rotational force MX to the main test side transmission chain 2 and generate the bending moments My, Mz and forces Fx, Fy, Fz. The hydraulic locking device 5 is arranged on the main test side transmission chain 2 and the connecting device 4, and is used to connect and fix the main test side transmission chain 2. The electric slip ring assembly 6 is arranged at the bottom of the connecting device 4, and is used to transmit power and control information to the connecting device 4, wherein:

[0033] The connecting device 4 includes a drum-shaped gear sleeve 41, a T-shaped connecting sleeve 43, a Z-shaped connecting sleeve 45 and a hydraulic cylinder group 47. The T-shaped connecting sleeve 43 is sleeved on one end of the drum-shaped gear sleeve 41, and the Z-shaped connecting sleeve 45 is sleeved on the other end of the drum-shaped gear sleeve 41. The T-shaped connecting sleeve 43 and the Z-shaped connecting sleeve 45 are arranged correspondingly. The hydraulic cylinder group 47 is arranged in more than three groups along the circumference between the T-shaped connecting sleeve 43 and the Z-shaped connecting sleeve 45. Taking the hydraulic cylinder group 47 as four groups as an example, the hydraulic cylinder group 47 is arranged in four directions of up, down, left and right between the T-shaped connecting sleeve 43 and the Z-shaped connecting sleeve 45 respectively.

[0034] Further, in the full-operation load test device for the transmission chain of the present invention, the two ends of the drum gear sleeve 41 are respectively in contact with the main test side transmission chain 2 and the accompanying test side transmission chain 3, the first drum gear 42 is symmetrically arranged on the outer side of the two ends of the drum gear sleeve 41, the second drum gear 44 is arranged on the inner side of the T-type connecting sleeve 43, and the third drum gear 46 is arranged on the inner side of the Z-type connecting sleeve 45, the second drum gear 44 and the third drum gear 46 are respectively meshed with the first drum gear 42, and the accompanying test side transmission chain 3 is belted. The movable T-type connecting sleeve 43 rotates, and the second drum-shaped tooth 44 on the T-type connecting sleeve 43 is connected with the first drum-shaped tooth 42 at one end of the drum-shaped tooth sleeve 41 to transmit the power to the drum-shaped tooth sleeve 41, and the first drum-shaped tooth 42 at the other end of the drum-shaped tooth sleeve 41 is connected with the third drum-shaped tooth 46 to transmit the power to the Z-type connecting sleeve 45, and the Z-type connecting sleeve 45 drives the main test side transmission chain 2 to rotate, and the T-type connecting sleeve 43 and the Z-type connecting sleeve 45 jointly drive the hydraulic cylinder group 47 to rotate along with the accompanying test side transmission chain 3.

[0035] Optionally, a strain sensor and a vibration sensor may be installed between the T-shaped connecting sleeve 43 and the Z-shaped connecting sleeve 45, so as to collect and monitor real-time data such as torque and vibration of the test-side transmission chain 3 during the test process.

[0036] Furthermore, in the full-condition load test device for the fan transmission chain of the present invention, the hydraulic cylinder group 47 includes a radial hydraulic cylinder 48 and an axial hydraulic cylinder 49. The radial hydraulic cylinder 48 is radially installed on the inner side of the T-type connecting sleeve 43 along the rotating axis, and the axial hydraulic cylinder 49 is axially installed on the outer side of the T-type connecting sleeve 43 along the rotating axis. The output ends of the radial hydraulic cylinder 48 and the axial hydraulic cylinder 49 are both connected to the Z-type connecting sleeve 45, so that the hydraulic cylinder group 47 arranged in four directions of up, down, left and right, that is, 8 hydraulic cylinders, push and pull during the rotation process, so as to simulate the bending moment and force in the actual operation of the fan, and cooperate with the torque applied by the motor to achieve a complete simulation of the ultimate load of the fan hub.

[0037] Furthermore, in the full-operating load test device for the fan transmission chain of the present invention, the outer end surface of the T-type connecting sleeve 43 is fixedly connected to the accompanying test side transmission chain 3 by bolts, and the outer end surface of the Z-type connecting sleeve 45 is fixedly connected to the main test side transmission chain 2 by a hydraulic locking device 5. The hydraulic locking device 5 is normally closed and disconnected when powered on, thereby effectively ensuring the rapid replacement of the main test side transmission chain 2, improving the test efficiency, and reducing the test cost.

[0038] Furthermore, in the full-operating load test device for the wind turbine transmission chain of the present invention, the electric slip ring assembly 6 includes a brush 61 and a slip ring 62, the brush 61 is fixedly mounted on the test platform 100, the slip ring 62 is fixed on the circumferential outer side of the T-shaped connecting sleeve 43, the input end of the slip ring 62 is electrically connected to the brush 61, and the output end of the slip ring 62 is electrically connected to the hydraulic cylinder group 47, thereby effectively ensuring that the hydraulic cylinder group 47 can be controlled in real time during the rotation process, and the real-time change of the control load is realized.

[0039] Optionally, a force-bearing and bending moment-bearing device is arranged inside the accompanying test side transmission chain 3 or between the accompanying test side transmission chain and the connecting device 4 to bear the bending moment and force of the reaction of the main test side transmission chain 2 .

[0040] Specifically, when the control system transmits power and signals to the electric slip ring 62 through the brush 61, the transmission chain 3 on the test side drives the T-type connecting sleeve 43 to rotate, and drives the drum gear sleeve 41 to rotate through the meshing of the second drum gear 44 and the first drum gear 42 at one end, and transmits the Z-type connecting sleeve 45 through the meshing of the first drum gear 42 and the third drum gear 46 at the other end, and the Z-type connecting sleeve 45 drives the main test side transmission chain 2 to rotate. The T-type connecting sleeve 43 and the Z-type connecting sleeve 45 jointly drive the hydraulic cylinder group 47 to rotate with the test side transmission chain 3. When performing a load test, according to the load characteristics, the control system transmits power and control signals to the electric slip ring 62 through the brush 61, so as to control the radial hydraulic cylinder 48 and the axial hydraulic cylinder 49 in the hydraulic cylinder group 47 in the four directions of up, down, left and right, so as to cooperate with the rotational torque provided by the motor to simulate the central load of the fan hub under the selected working condition of the main test side transmission chain 2;

[0041] When the main test side transmission chain 2 is replaced, the hydraulic locking device 5 is powered on and disconnected, so that the main test side transmission chain 2 and the Z-shaped connecting sleeve 45 are separated for replacement.

[0042] In another aspect of the present invention, a method for full-operating load test of a wind turbine transmission chain is provided, comprising the following steps:

[0043] Step 1: According to the parameters and layout of the test device, the conversion relationship between the hub center rotation load and the tension and pressure of the hydraulic cylinder group is obtained. According to the parameters and layout of the test device, appropriate control conditions are added, and after the conversion relationship and the control conditions are combined, the equation group has a unique solution;

[0044] Step 2: Combine the conversion relationship with the control conditions to obtain the conversion matrix between the center load of the fan hub and the tension, pressure of the hydraulic cylinder group, and the torque of the transmission chain motor on the test side;

[0045] Step 3: Use the conversion matrix to convert the ultimate load, fatigue load, accelerated fatigue load or any working load to be tested into the corresponding hydraulic cylinder group tension and pressure and the test side transmission chain motor torque;

[0046] Step 4: The converted timing file of the tension or pressure of the hydraulic cylinder group and the timing file of the transmission chain motor on the test side are converted into electrical signals by the control system, and the electrical power and electrical signals are directly input to the transmission chain motor on the test side, and the electrical power and electrical signals are input to the hydraulic cylinder assembly through the electric slip ring assembly;

[0047] Step 5: Record and collect the test data of the transmission chain on the main test side, and conduct static, fatigue or dynamic studies.

[0048] Optionally, in the full-operating load test method for the fan transmission chain of the present invention, the relationship between the hub center load and the hydraulic cylinder is:

[0049] MX is generated by the test transmission chain: MX = P × η / n;

[0050] Among them, P represents the power of the transmission chain motor on the test side; n represents the speed of the transmission chain motor on the test side; η represents the efficiency of the transmission chain on the test side;

[0051] MY is generated by the vertical cylinder: MY = F OU ×AF OD ×AF IU ×BF ID ×B, MZ is generated by the horizontal cylinder: MZ = -F OL ×A+F OR ×A+F IL ×B+F IR ×B, FX is generated by the combined force of the four outer cylinders: FX = F OU +F OD +F OL +F OR , FY is generated by the inner cylinder in the horizontal direction: FY = F IL +F IR , FZ is generated by the inner cylinder in the horizontal direction: FZ = F IU +F ID ;

[0052] like Figure 4 As shown, A represents the radial distance from the corresponding hub center point O to the axial hydraulic cylinder 49 in the actual operation of the main test side transmission chain 3; B represents the axial distance from the corresponding hub center point O to the radial hydraulic cylinder 48 in the actual operation of the main test side transmission chain 3; I represents the inner radial hydraulic cylinder; O represents the outer axial hydraulic cylinder, and U, D, L, and R represent the four directions of up, down, left, and right respectively.

[0053] When fully simulating a working condition, the forces of the eight hydraulic cylinders do not have a unique solution. In actual operation, three more control conditions need to be added (for example, let F OU =-F OD , F IL =F IR , F IU =F ID ) so that it has a unique solution.

[0054] To sum up, compared with the prior art, the wind turbine transmission chain full-operating condition load test device and test method of the present invention have the following advantages and beneficial effects: the present invention realizes a complete simulation of the wind turbine hub limit load through the push and pull of multiple hydraulic cylinders, and can control the real-time change of the load, thereby realizing the simulation test of the wind turbine limit load, fatigue load, accelerated fatigue load or any assumed operating condition load, and the setting of the hydraulic locking device effectively realizes the rapid replacement of the main test side transmission chain, effectively reducing the test cost.

[0055] It should be noted that, in this article, unless otherwise clearly specified and limited, the term "connection" or its synonyms should be understood in a broad sense. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A full-operation load test device for a fan transmission chain, installed on a test platform, characterized in that: The wind turbine transmission chain full-operating load test device comprises a main test side transmission chain, a companion test side transmission chain, a connecting device, a hydraulic locking device and an electric slip ring assembly. The connecting device is arranged between the companion test side transmission chain and the main test side transmission chain, and is used to transmit torsional torque to the main test side transmission chain, and to apply bending moment and force to the main test side transmission chain to simulate the hub center bending moment and force in actual operation. The hydraulic locking device is arranged on the main test side transmission chain and the connecting device, and is used to connect and fix the main test side transmission chain. The electric slip ring assembly is arranged at the bottom of the connecting device, and is used to transmit power and control information to the connecting device, wherein: The connecting device includes a drum-shaped gear sleeve, a T-shaped connecting sleeve, a Z-shaped connecting sleeve and a hydraulic cylinder group. The T-shaped connecting sleeve is sleeved on one end of the drum-shaped gear sleeve, and the Z-shaped connecting sleeve is sleeved on the other end of the drum-shaped gear sleeve. The T-shaped connecting sleeve and the Z-shaped connecting sleeve are arranged correspondingly, and the hydraulic cylinder group is arranged in no less than three groups along the circumference between the T-shaped connecting sleeve and the Z-shaped connecting sleeve.

2. The full-operating load test device for a fan transmission chain according to claim 1 is characterized in that: The two ends of the drum-shaped gear sleeve are respectively in contact with the main test side transmission chain and the accompanying test side transmission chain, the first drum-shaped teeth are symmetrically arranged on the outer side of the circumference of the two ends of the drum-shaped gear sleeve, the second drum-shaped teeth are arranged on the inner side of the T-shaped connecting sleeve, and the third drum-shaped teeth are arranged on the inner side of the Z-shaped connecting sleeve, and the second drum-shaped teeth and the third drum-shaped teeth are respectively meshed with the first drum-shaped teeth.

3. The full-operating load test device for a fan transmission chain according to claim 1 is characterized in that: The hydraulic cylinder group includes a radial hydraulic cylinder and an axial hydraulic cylinder. The radial hydraulic cylinder is installed on the inner side of the T-shaped connecting sleeve radially along the rotating axis, and the axial hydraulic cylinder is installed on the outer side of the T-shaped connecting sleeve axially along the rotating axis. The output ends of the radial hydraulic cylinder and the axial hydraulic cylinder are both connected to the Z-shaped connecting sleeve.

4. The full-operating load test device for a fan transmission chain according to claim 1 is characterized in that: The outer end surface of the T-shaped connecting sleeve is fixedly connected to the accompanying test side transmission chain through bolts, and the outer end surface of the Z-shaped connecting sleeve is fixedly connected to the main test side transmission chain through the hydraulic locking device.

5. The full-operating load test device for a fan transmission chain according to claim 1 is characterized in that: The electric slip ring assembly includes a brush and a slip ring, wherein the brush is fixedly mounted on the test platform, the slip ring is fixed outside the circumference of the T-shaped connecting sleeve, the slip ring input end is electrically connected to the brush, and the slip ring output end is electrically connected to the hydraulic cylinder group.

6. A full-operation load test method for a fan transmission chain, characterized in that: The full-operating load test method for the fan transmission chain comprises the following steps: Step 1: According to the parameters and layout of the test device, the conversion relationship between the central load of the fan hub and the tension and pressure of the hydraulic cylinder group is obtained, and appropriate control conditions are added according to the parameters and layout of the test device. After the conversion relationship and the control conditions are combined, the equation group has a unique solution; Step 2: Combine the conversion relationship with the control conditions to obtain the conversion matrix between the center load of the fan hub and the tension and pressure of the hydraulic cylinder group and the torque of the transmission chain motor on the test side; Step 3: Use the conversion matrix to convert the ultimate load, fatigue load, accelerated fatigue load or any working load to be tested into the corresponding hydraulic cylinder group tension and pressure and the test side transmission chain motor torque; Step 4: The converted timing file of the tension or pressure of the hydraulic cylinder group and the timing file of the transmission chain motor on the test side are converted into electrical signals by the control system, and the electrical power and electrical signals are directly input to the transmission chain motor on the test side, and the electrical power and electrical signals are input to the hydraulic cylinder group through the electric slip ring assembly; Step 5: Record and collect the test data of the transmission chain on the main test side, and conduct static, fatigue or dynamic studies.

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