Two-channel torsional fatigue test device

Abstract

The invention belongs to the technical field of brake fatigue performance test, and particularly relates to a double-channel torsional fatigue test device. The device comprises a double-channel driving mechanism and transmission systems which are symmetrically arranged, the double-channel driving mechanism comprises a base, a bidirectional driver, a motor and a driving shaft, each transmission system comprises a frame, a power shaft, an electric control clutch, a protection cylinder and a rotating cylinder, and the power shafts and the rotating cylinders are coaxially arranged; and the front end of the rotary drum is provided with an extension drum and is respectively provided with a brake disc mounting seat and a brake mounting seat. Swing arms are arranged on the two sides of the rotary drum, the swing arm on one side is connected with tension and compression sensors arranged up and down through a push-pull rod and used for detecting bidirectional torque generated in the braking process, and the swing arm on the other side limits the swing angle of the rotary drum through a limiting pull rod. Selective connection or separation of the transmission systems on the left side and the right side is achieved through the electric control clutch, and the other side can still be tested independently when one side breaks down.

Description

Technical Field

[0001] This invention belongs to the field of brake testing technology, specifically relating to a dual-channel torsional fatigue testing device. Background Technology

[0002] In automotive braking systems, construction machinery braking systems, and other fields, brakes and brake discs are frequently subjected to acceleration, braking, and repeated torsional loads during actual use. Their fatigue performance under long-term alternating torque directly affects the safety and reliability of the braking system. Therefore, during product development and quality testing, specialized torsional fatigue testing equipment is typically used to test and analyze the torque changes generated by brakes and brake discs under simulated operating conditions.

[0003] Existing torsional fatigue testing equipment mostly adopts a single-channel structure, meaning that a single drive mechanism drives a single set of brake discs and brakes to perform torsional testing. In practical applications, this type of equipment can usually only test a single station. When multiple sets of brakes need to be tested, multiple devices or multiple batch tests are often required. This not only results in large equipment footprint and low testing efficiency, but also forces the entire testing process to be interrupted if the single-channel device malfunctions or needs to be shut down for debugging, affecting the continuity and integrity of the test data.

[0004] Furthermore, some existing testing devices have a relatively fixed coupling method between the drive system and the transmission system in their structural design, lacking the ability to independently control different testing stations. When one testing unit malfunctions or needs to stop working, it is often impossible to effectively isolate the power to that side, causing the other testing unit to also need to stop simultaneously, thus further reducing the utilization rate of the equipment.

[0005] Meanwhile, with the increasing demand for multi-station or parallel testing, traditional single-channel or rigidly coupled torsional fatigue testing devices are no longer able to simultaneously meet the requirements of multi-channel synchronous testing and single-channel independent operation, and are unable to meet the comprehensive requirements of braking system torsional fatigue testing in terms of efficiency, continuity and reliability. Summary of the Invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a dual-channel torsional fatigue testing device that can realize dual-channel drive and selectively connect or disconnect each transmission system to solve the problems of low testing efficiency and easy overall shutdown due to single-sided failure in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A dual-channel torsional fatigue testing device, the key technical features of which are: a dual-channel drive mechanism and a transmission system, wherein the dual-channel drive mechanism includes a base, a bidirectional driver is provided on the top of the base, and a motor is provided on the top of the bidirectional driver; drive shafts are installed on both sides of the base;

[0009] The transmission system is symmetrically arranged on both sides of the dual-channel drive mechanism. The transmission system includes a frame, through which a power shaft rotates horizontally. The axes of the power shaft and the drive shaft coincide. An electronically controlled clutch is provided between the power shaft and the drive shaft.

[0010] A protective cylinder is fixed inside the frame, and a rotating cylinder is rotatably installed inside the protective cylinder. The power shaft coincides with the axis of the rotating cylinder. An extension cylinder is installed at the front end of the rotating cylinder through a flange. The power shaft passes through the extension cylinder, and both the power shaft and the extension cylinder extend beyond the surface of the frame.

[0011] Furthermore, the end face of the extended cylinder of the power shaft is provided with a brake disc mounting seat at the end of the power shaft and a brake mounting seat at the end of the rotating cylinder.

[0012] Furthermore, two swing arms are bolted to both sides of the rotating drum surface, and both swing arms are perpendicular to the axis of the rotating drum.

[0013] Furthermore, the protective cylinder has symmetrically arranged open windows on its surface, and the two swing arms pass through the open windows on both sides respectively;

[0014] The swing arm is symmetrically provided with an extension plate at one end near the rotating drum, and the extension plate is fixed to the surface of the rotating drum by bolts.

[0015] Furthermore, a through groove is provided at the end of the swing arm away from the rotating cylinder. Push-pull rods are installed at the top and bottom of the swing arm end on the left side through joint bearings. The joint bearings are placed inside the through groove. Tension and compression sensors are installed at the top and bottom of one side of the frame through joint bearings. The two push-pull rods are respectively installed at the input ends of the two tension and compression sensors.

[0016] Furthermore, a limiting rod is installed at the right end of the swing arm via a spherical bearing. The spherical bearing is located inside the through groove, and the top of the limiting rod is hinged to the upper inner side of the frame. The limiting rod is used to limit the maximum swing angle of the rotating drum.

[0017] Furthermore, the bidirectional drive is used to synchronously or independently control the drive shafts on the left and right sides, and to selectively engage or disengage the corresponding transmission system through the electronically controlled clutch, so that when one side of the transmission system stops working, the other side of the transmission system can independently undergo torsional fatigue testing.

[0018] Furthermore, the upper and lower tension and compression sensors are used to detect the tension or compression signals generated by the drum in the clockwise and counterclockwise braking conditions, respectively, so as to realize the synchronous acquisition and detection of bidirectional torque changes during braking.

[0019] Furthermore, the limiting rod and the rotating drum form a mechanical swing limiting structure. When the swing angle of the rotating drum reaches a preset threshold, the limiting rod limits the swing arm to prevent the rotating drum from swinging excessively and damaging the tension and compression sensor.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] By setting up a dual-channel drive mechanism and a symmetrically arranged transmission system, the test device is able to perform torsional fatigue tests on two sets of brakes and brake discs simultaneously. Compared with traditional single-channel test devices, it can complete the test tasks of more test stations in the same amount of time. It solves the problems of low test efficiency and the need for multiple devices or batch testing in the existing technology from a structural perspective, and improves the overall efficiency and equipment utilization of torsional fatigue testing.

[0022] By setting an electronically controlled clutch between the drive shaft and the power shaft, and cooperating with a bidirectional drive to synchronously or independently control the left and right drive shafts, the transmission systems on both sides can selectively engage or disengage. When one side of the test channel malfunctions or needs to be adjusted, the corresponding power output can be cut off separately without affecting the normal operation of the other side, thereby avoiding the problem of the whole machine stopping due to a single-sided abnormality and improving the continuity and reliability of the test process.

[0023] By using a structure in which the power shaft and the rotating drum are coaxial, the torque generated during braking can be stably transmitted to the rotating drum, and the rotating drum drives the swing arm to swing at an angle, effectively converting the torsional load into a detectable mechanical signal. This reduces test errors caused by transmission eccentricity or structural misalignment, and improves the accuracy and repeatability of torque detection results.

[0024] By setting swing arms perpendicular to the axis on both sides of the rotating drum, and arranging push-pull rods and tension / compression sensors on one side, the torque changes generated in both clockwise and counterclockwise directions during braking can be effectively collected. This solves the problem of incomplete detection of bidirectional braking torque in the existing technology and realizes synchronous detection and data acquisition of bidirectional braking torque changes.

[0025] By setting a limiting rod on the other side of the swing arm to form a mechanical swing limiting structure, when the swing angle of the rotating drum reaches the preset range under high torque conditions, the swing of the rotating drum is effectively limited, preventing excessive swing of the rotating drum from impacting or damaging the tension and compression sensors, thereby improving the service life of the detection components and the safety of the test process.

[0026] By installing a protective cylinder inside the frame and opening an open window on the surface of the protective cylinder for the swing arm to pass through, the swing arm can both transmit force during the swing process and be isolated and protected by the protective cylinder. This reduces the safety risks caused by the exposed swing parts during the test and improves the safety and stability of the test device under long-term fatigue test conditions. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the formal structure of the present invention;

[0028] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0029] Figure 3 This is a schematic diagram of the transmission system and brake disc mounting structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the tension / compression sensor mounting structure of the present invention;

[0031] Figure 5 For the present invention Figure 4 A schematic diagram of the longitudinal sectional structure;

[0032] Figure 6 This is a schematic diagram of the installation structure of the rotating drum and protective cylinder of the present invention;

[0033] Figure 7 This is a three-dimensional structural diagram of the swing arm of the present invention.

[0034] The attached diagram lists the components represented by each number as follows:

[0035] 1. Dual-channel drive mechanism; 11. Base; 12. Bidirectional driver; 13. Drive shaft; 2. Transmission system; 21. Frame; 22. Power shaft; 221. Brake disc mounting base; 23. Rotary drum; 231. Extension drum; 232. Brake mounting base; 233. Swing arm; 234. Extension plate; 235. Through slot; 24. Protective cylinder; 241. Open window; 25. Push-pull rod; 26. Tension / compression sensor; 27. Limiting rod; 3. Electronically controlled clutch. Detailed Implementation

[0036] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0037] Example 1:

[0038] See Figure 1-7A dual-channel torsional fatigue testing device is disclosed, the key technical features of which are: a dual-channel drive mechanism 1 and a transmission system 2. Addressing the problems of existing torsional fatigue testing devices often employing a single-channel structure, resulting in low testing efficiency and the risk of overall shutdown due to unilateral failure, the dual-channel drive mechanism 1 enables parallel testing at multiple stations. The dual-channel drive mechanism 1 includes a base 11, which supports the entire testing device and ensures its overall stability. A bidirectional driver 12 is mounted on the top of the base 11, outputting a forward and reverse reversible driving force to simulate the bidirectional force condition of the brake disc during braking. A motor is mounted on the top of the bidirectional driver 12, providing stable torque output as a power source. Drive shafts 13 are installed on both sides of the base 11, serving as power output shafts for the left and right test channels respectively, transmitting power to the corresponding transmission system 2.

[0039] The transmission system 2 is symmetrically positioned on both sides of the dual-channel drive mechanism 1. Addressing the issue of fixed transmission paths and lack of independent control in traditional devices, the symmetrical arrangement achieves structural balance and independent channels. The transmission system 2 includes a frame 21, which is used to install and support various transmission and detection components. A power shaft 22 rotates horizontally through the center of the frame 21, serving as the core transmission shaft directly driving the brake disc rotation. The axes of the power shaft 22 and the drive shaft 13 coincide to reduce transmission load imbalance and improve torque transmission accuracy. An electronically controlled clutch 3 is installed between the power shaft 22 and the drive shaft 13. This clutch 3 is used to engage or disengage power during testing to solve the problem of machine shutdown due to unilateral failure.

[0040] A protective cylinder 24 is fixed inside the frame 21. The protective cylinder 24 is used to protect the internal rotating and swinging components and improve the safety of the test. A rotating cylinder 23 is rotatably installed inside the protective cylinder 24. The rotating cylinder 23 is used to swing at an angle under the action of braking torque to reflect the change of braking torque. The axis of the power shaft 22 is coincident with that of the rotating cylinder 23 to ensure the coaxiality of torque transmission and the accuracy of test data. An extension cylinder 231 is installed at the front end of the rotating cylinder 23 through a flange. The extension cylinder 231 is used to extend the installation space to adapt to different specifications of brake discs. The power shaft 22 passes through the extension cylinder 231 to realize the power connection between the brake disc and the rotating cylinder 23. Both the power shaft 22 and the extension cylinder 231 extend beyond the surface of the frame 21 to facilitate the installation and replacement of the brake disc and brake.

[0041] See Figure 3The end face of the extended cylinder 231 of the power shaft 22 is provided with a brake disc mounting seat 221. The brake disc mounting seat 221 is used to position and fix the brake disc to ensure stable rotation of the brake disc during the test. The end of the rotating cylinder 23 is provided with a brake mounting seat 232. The brake mounting seat 232 is used to install the brake and make the brake and the brake disc form a corresponding braking relationship, thereby generating torsional load during the braking process.

[0042] See Figure 6 Both sides of the rotating drum 23 are bolted with swing arms 233. In view of the problem that the torque detection structure in the existing device is simple and the response is not sensitive, the angle change of the rotating drum 23 is converted into linear force by the swing arms 233. Both swing arms 233 are perpendicular to the axis of the rotating drum 23 to ensure that the swing arms 233 generate stable and measurable swing when the rotating drum 23 is twisted.

[0043] refer to Figure 4 , Figure 6 and Figure 7 As shown, the protective cylinder 24 has symmetrically opened open windows 241 on its surface. The open windows 241 are used to provide swing space for the swing arm 233 and avoid interference. The two swing arms 233 pass through the open windows 241 on both sides to complete the swing transmission in the protected state. The swing arm 233 is symmetrically provided with an extension plate 234 at one end near the rotating cylinder 23. The extension plate 234 is used to increase the connection strength between the swing arm 233 and the rotating cylinder 23. The extension plate 234 is fixed to the surface of the rotating cylinder 23 by bolts to ensure reliable connection in repeated torsional fatigue test.

[0044] See Figure 4 The swing arm 233 has a through groove 235 at the end opposite to the rotating drum 23. The through groove 235 is used to accommodate the detection and limiting structure. The swing arm 233 on the left side has push-pull rods 25 installed at both the top and bottom through joint bearings. The push-pull rods 25 are used to convert the swing of the swing arm 233 into axial tensile and compressive displacement. The joint bearings are placed inside the through groove 235 to accommodate the swing of the swing arm 233 at different angles. Tension and compression sensors 26 are installed at both the top and bottom through joint bearings on one side of the frame 21. The tension and compression sensors 26 are used to collect the tension or pressure signals transmitted by the push-pull rods 25. The two push-pull rods 25 are respectively installed at the input ends of the two tension and compression sensors 26 to realize torque detection under different force directions.

[0045] See Figure 4The right-side swing arm 233 has a limit rod 27 mounted on its end via a spherical bearing. The limit rod 27 is used to solve the problem of excessive swing angle of the rotating drum 23 under high torque conditions. The spherical bearing is placed inside the through groove 235 to ensure the flexible connection of the limit rod 27 during swing. The top of the limit rod 27 is hinged to the upper inner side of the frame 21 to form a stable limit fulcrum. The limit rod 27 is used to limit the maximum swing angle of the rotating drum 23 to prevent the detection components from being damaged due to overload.

[0046] See Figure 3 The bidirectional drive 12 is used to synchronously or independently control the drive shafts 13 on the left and right sides. In view of the problem that traditional test devices cannot take into account both parallel testing and single-channel independent operation, the bidirectional drive 12 realizes multi-condition control. Furthermore, the electronically controlled clutch 3 realizes the selective engagement or disengagement of the corresponding transmission system 2. Thus, when one side of the transmission system 2 stops working, the other side of the transmission system 2 can independently carry out torsional fatigue testing, thereby improving equipment utilization and ensuring test continuity.

[0047] See Figure 4-5 The upper and lower tension and compression sensors 26 are used to detect the tension or pressure signals generated by the rotating drum 23 under the braking conditions in the clockwise and counterclockwise directions, respectively. To address the issue of torque direction changes during braking, a dual-sensor structure is used to achieve complete data acquisition; thus, the synchronous acquisition and detection of bidirectional torque changes during braking is realized, and the detection data is used for subsequent analysis.

[0048] See Figure 3-7 The limiting rod 27 and the rotating drum 23 form a mechanical swing limiting structure. To address the issue that excessive swing of the rotating drum 23 during the test may damage the sensor, a mechanical limiting method is used to constrain it. When the swing angle of the rotating drum 23 reaches the preset threshold, the limiting rod 27 limits the swing arm 233 to prevent excessive swing of the rotating drum 23 from damaging the tension and compression sensor 26.

[0049] Example 2:

[0050] See Figure 1 , Figure 2 and Figure 3 This embodiment discloses a dual-channel torsional fatigue testing device, including a dual-channel drive mechanism 1 and a transmission system 2 respectively arranged on both sides of the dual-channel drive mechanism 1; the dual-channel drive mechanism 1 includes a base 11, which is used to support and fix the entire testing device; a bidirectional driver 12 is provided on the top of the base 11, which is used to output controllable driving force in both directions; a motor is provided on the top of the bidirectional driver 12, which is used to provide power output to the bidirectional driver 12; drive shafts 13 are respectively installed on both sides of the base 11, which correspond to the left and right test channels and provide power to the transmission system 2.

[0051] During the test, the bidirectional driver 12 drives the drive shafts 13 on both sides to rotate simultaneously under the control command. The two sets of transmission systems 2 drive the corresponding brake discs and brakes to perform torsional fatigue loading, so that the device can complete the torsional fatigue test of two test positions at the same time, realize parallel testing from the structure, and improve the test efficiency.

[0052] In a torsional fatigue testing device with only a single-channel drive structure, only a single brake disc and brake combination can be tested at a time. When multiple sets of tests need to be completed, they must be carried out in batches, which significantly extends the test cycle. This verifies the feasibility of this embodiment in improving test efficiency.

[0053] Example 3:

[0054] See Figure 1 , Figure 3 and Figure 4 In this embodiment, an electronically controlled clutch 3 is provided between the drive shaft 13 and the power shaft 22. The electronically controlled clutch 3 is used to control the engagement and disengagement of power. The transmission system 2 includes a frame 21, which is used to support the power shaft 22 and related detection components.

[0055] During the test, when the left transmission system 2 needs to be stopped for maintenance or adjustment of the test conditions, the corresponding electronically controlled clutch 3 is disconnected by the control system, so that the left drive shaft 13 is disconnected from the power shaft 22; the right electronically controlled clutch 3 remains engaged, and the right transmission system 2 continues to undergo torsional fatigue test under the drive of the bidirectional drive 12, thereby ensuring that the test is not interrupted.

[0056] In the test device without an electronically controlled clutch, the power transmission on the left and right sides is rigidly connected. When one side stops, the other side also needs to stop synchronously, which affects the continuity of the test and verifies the technical advantages of this embodiment in terms of independent operation capability.

[0057] Example 4:

[0058] See Figure 3 and Figure 6 In this embodiment, the power shaft 22 and the rotating drum 23 are coaxially arranged; the front end of the rotating drum 23 is equipped with an extension cylinder 231 through a flange, and the power shaft 22 passes through the extension cylinder 231 and extends beyond the surface of the frame 21 for mounting the brake disc.

[0059] When the brake applies braking torque to the brake disc, the torque is transmitted coaxially to the rotating drum 23 along the power shaft 22. The rotating drum 23 swings at an angle under the action of the torque. Since the power shaft 22 and the rotating drum 23 are arranged coaxially, the additional load caused by assembly error or structural eccentricity can be reduced, the stability of torque transmission can be improved, and the accuracy of the test data can be guaranteed.

[0060] In a test device where the power shaft and the rotating drum are not coaxial, additional bending moment is easily generated during torque transmission, leading to fluctuations in the test data. This verifies the feasibility of this embodiment in improving test accuracy.

[0061] Example 5:

[0062] See Figure 4 and Figure 5 In this embodiment, swing arms 233 are provided on both sides of the rotating drum 23. The swing arms 233 are used to convert the swing of the rotating drum 23 into linear displacement. A push-pull rod 25 is installed at the end of the left swing arm 233 through a joint bearing. The push-pull rod 25 is used to transmit the swing force of the swing arm 233. Tension and compression sensors 26 are installed on the upper and lower sides of one side of the frame 21, and the push-pull rod 25 is connected to the upper and lower tension and compression sensors 26 respectively.

[0063] When the drum 23 swings clockwise, the upper tension / compression sensor 26 generates a tension signal, and the lower tension / compression sensor 26 generates a compression signal; when the drum 23 swings counterclockwise, the upper and lower tension / compression sensors 26 are subjected to opposite forces, thereby achieving synchronous detection of bidirectional torque changes during braking.

[0064] In a test structure with only a single tension / compression sensor, torque data can only be obtained in one direction. The detection structure in the other direction needs to be rearranged to verify the improvement effect of this embodiment in bidirectional detection capability.

[0065] Example 6:

[0066] See Figure 3 , Figure 6 and Figure 7 In this embodiment, a limiting rod 27 is provided at the end of the right swing arm 233. The limiting rod 27 is installed inside the through groove 235 through a joint bearing, and the top of the limiting rod 27 is hinged to the upper inner side of the frame 21.

[0067] During braking, when the rotating drum 23 swings significantly due to abnormal operating conditions, the swing arm 233 drives the limiting rod 27 to move. When the swing angle reaches the preset range, the limiting rod 27 mechanically limits the swing arm 233, structurally restricting the maximum swing angle of the rotating drum 23 and preventing the tension sensor 26 from being subjected to overload impact.

[0068] In a test device without a limiting structure, excessive swing of the rotating drum can easily damage the tension and compression sensors, thus verifying the technical effectiveness of this embodiment in terms of safety.

[0069] Example 7:

[0070] See Figure 1 , Figure 6 and Figure 7In this embodiment, a protective cylinder 24 is fixedly installed inside the frame 21. The protective cylinder 24 is used to cover the rotating cylinder 23 and the swing arm 233. Open windows 241 are symmetrically opened on the surface of the protective cylinder 24. The open windows 241 are used for the swing arm 233 to pass through and complete the swing.

[0071] During the test, the swing arm 233 swings within the space defined by the protective cylinder 24. The protective cylinder 24 provides isolation and protection for the rotating and swinging components, reducing the risk of accidental contact by operators and minimizing interference from the external environment on the test structure, thereby improving the safety and stability of the test process.

[0072] In the test device without a protective casing, the swinging component is exposed, posing a safety hazard, thus verifying the improvement effect of this embodiment in terms of structural protection.

[0073] The working principle of this invention is as follows:

[0074] In use, the brake disc is fixed on the brake disc mounting base 221, and the brake is fixed on the brake mounting base 232, so that the brake and the brake disc correspond to each other. The two-way drive 12 can control the two drive shafts 13 to rotate synchronously at the same time, and the power is transmitted to the drive shaft 22 through the electronically controlled clutch 3 to drive the brake disc to rotate. The controller controls the brake to test the brake disc. When the brake is applied, the inertia will generate torque to drive the rotating drum 23 to rotate at a certain angle. While the rotating drum 23 is rotating, the left and right swing arms 233 can swing at a certain angle. The left and right swing arms 233 both pass through the open window 241 and are protected by the protective cylinder 24.

[0075] During the test, the left swing arm 233 swings, and the upper and lower tension and compression sensors 26 can be pulled or pressed by the push-pull rod 25. Both are installed by joint bearings to adapt to the angle change during the swing. The torque of the rotating drum 23 during braking is tested by the detection of the upper and lower tension and compression sensors 26, and the value is transmitted to the computer for recording and analysis. During this process, the right swing arm 233 at the other end is always limited by the limit rod 27 to limit the swing angle of the rotating drum 23 when it reaches the threshold, so as to prevent the swing angle from exceeding the detection range of the tension and compression sensors 26 and causing irreversible damage. The structure is equipped with tension and compression sensors 26 at both the top and bottom to adapt to different force directions during braking.

[0076] If a single workstation malfunctions or cannot be tested during debugging, the electronically controlled clutch 3 on that side can be disconnected, preventing the power of the drive shaft 13 on that side from being transmitted to the transmission system 2, thus stopping the work without affecting the test on the other side, reducing the probability of downtime, and preventing test interruption from affecting the data.

[0077] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A dual channel torsional fatigue testing apparatus, characterized by: Including double channel drive mechanism (1) and transmission system (2), the double channel drive mechanism (1) includes base (11), the top of base (11) is provided with two-way driver (12), the top of two-way driver (12) is provided with motor;The both sides of base (11) are both installed with drive shaft (13); The transmission system (2) is symmetrically arranged on the both sides of double channel drive mechanism (1), the transmission system (2) includes frame (21), the center of frame (21) is horizontally rotated and penetrates power shaft (22), the axis of power shaft (22) and drive shaft (13) coincides, and the electric control clutch (3) is arranged between power shaft (22) and drive shaft (13); The inside of frame (21) is fixed with protection cylinder (24), the inside of protection cylinder (24) is rotatably installed with rotating cylinder (23), the axis of power shaft (22) and rotating cylinder (23) coincides, the front end of rotating cylinder (23) is installed with extension cylinder (231) through flange, power shaft (22) penetrates extension cylinder (231), and power shaft (22) and extension cylinder (231) all exceed the surface of frame (21).

2. A dual channel torsional fatigue testing apparatus as claimed in claim 1, wherein: The end surface of power shaft (22) exceeds extension cylinder (231), the end of power shaft (22) is provided with brake disc mounting seat (221), and the end of rotating cylinder (23) is installed with brake mounting seat (232).

3. A dual channel torsional fatigue testing apparatus as defined in claim 1, wherein: The both sides of the surface of rotating cylinder (23) are both installed with swing arm (233) through bolt, and the both sides of swing arm (233) are perpendicular to the axis of rotating cylinder (23).

4. A dual channel torsional fatigue testing apparatus as claimed in claim 3, wherein: The surface of protection cylinder (24) is symmetrically provided with open window (241), and the both sides of swing arm (233) penetrate the both sides of open window (241) respectively; The end of swing arm (233) close to rotating cylinder (23) is symmetrically provided with extension plate (234), and extension plate (234) is fixed on the surface of rotating cylinder (23) through bolt.

5. A dual channel torsional fatigue testing apparatus as claimed in claim 4, wherein: The end of swing arm (233) away from rotating cylinder (23) is provided with through slot (235), the end of swing arm (233) on the left is installed with push-pull rod (25) through joint bearing on the upside and downside, and joint bearing is arranged on the inside of through slot (235), one side of frame (21) is installed with tension and compression sensor (26) through joint bearing on the upside and downside, and the input end of two tension and compression sensors (26) is installed with push-pull rod (25) respectively.

6. A dual channel torsional fatigue testing apparatus as claimed in claim 5, wherein: The end of swing arm (233) on the right is installed with limit pull rod (27) through joint bearing, and joint bearing is arranged on the inside of through slot (235), the top of limit pull rod (27) is hinged on the inside of frame (21) above, and limit pull rod (27) is used for limiting the maximum swing angle of rotating cylinder (23).

7. A dual channel torsional fatigue testing apparatus as defined in claim 1, wherein: Two-way driver (12) is used for synchronous or independent control of the both sides of drive shaft (13), and the selective engagement or separation of corresponding transmission system (2) is realized through electric control clutch (3), so that the other side transmission system (2) can independently carry out torsional fatigue test under the condition that one side transmission system (2) stops working.

8. A dual channel torsional fatigue testing apparatus as defined in claim 5, wherein: The upper and lower tension and pressure sensors (26) are respectively used for detecting the tension or pressure signals generated by the rotating drum (23) in the clockwise and counterclockwise braking conditions, so as to realize the synchronous acquisition and detection of the bidirectional torque changes in the braking process.

9. A dual channel torsional fatigue testing apparatus as defined in claim 6, wherein: The limiting pull rod (27) and the rotating drum (23) form a mechanical swing limiting structure, when the swing angle of the rotating drum (23) reaches a preset threshold, the limiting pull rod (27) limits the swing arm (233), so as to prevent the rotating drum (23) from swinging excessively and damaging the tension and pressure sensor (26).

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