Torque tester specially used for transmission shaft with spline

Abstract

The invention relates to the technical field of transmission shaft production, and discloses a torque tester special for a transmission shaft with splines, the splines are arranged at the two ends of the transmission shaft, a spline type fixing clamp is arranged on a rotary clamping seat and a fixing seat, and the spline type fixing clamp comprises a spline sleeve and a mounting seat. The rotary clamping seat and the fixed seat are respectively provided with a force application end detection ring and a fixed end detection ring around the mounting groove of the mounting seat, and the force application end detection ring and the fixed end detection ring are respectively provided with a laser transceiving port and a reflecting groove; the side, close to the mounting base, of the synchronous ring and the bottom face of the fixing groove in the spline sleeve are located on the same plane, a positioning rod is arranged on the side, close to the mounting base, of the synchronous ring, positioning holes are formed in the positions, corresponding to the positioning rod, of the force application end detection ring and the fixing end detection ring, and the positioning rod is inserted into the positioning holes. The positioning rod rotates to drive the force application end detection ring or the fixed end detection ring to rotate.

Description

Technical Field

[0001] The present invention relates to the technical field of drive shaft production, and specifically to a torque tester dedicated to drive shafts with splines. Background Art

[0002] In the field of modern mechanical engineering, as a core component for power transmission, drive shafts are widely used in various mechanical equipment such as automobiles, ships, industrial machine tools, and aerospace aircraft. Their torque transmission capacity plays a decisive role in the performance, reliability, and safety of the entire mechanical system.

[0003] With the continuous progress of industrial technology, mechanical equipment is continuously developing towards high precision, high power, high speed, and lightweight. This poses extremely stringent requirements for drive shafts. They not only need to stably transmit greater torque under complex and variable working conditions but also possess higher fatigue life and impact resistance. Take the high-performance automotive transmission system as an example. The drive shaft needs to ensure efficient and accurate power transmission under instantaneous high torque output and long-term high-speed operation. Otherwise, it will lead to a reduction in power transmission efficiency, poor vehicle driving performance, and even safety accidents.

[0004] However, in the research and development, production, and quality control of drive shafts, accurately evaluating their torque capabilities faces numerous challenges. Traditional torque testing methods mostly rely on relatively simple tools and equipment, with disadvantages such as low testing accuracy and poor data reliability. For example, some simple torque wrenches or simple loading devices can only carry out limited qualitative tests and cannot accurately measure key parameters such as the torque-angle characteristics, fatigue life, and ultimate torque bearing capacity of drive shafts under different working conditions. This makes the drive shaft design optimization process lack sufficient accurate data support and is difficult to meet the requirements of modern engineering for accurate evaluation of drive shaft performance and strict quality control.

[0005] In the prior art, for example, the patent with the publication number CN107515162B discloses a mechanical static torque testing machine that uses a fixture to clamp the shaft rod for torque testing. However, this method is extremely likely to affect the detection accuracy when the fixture clamping becomes loose or deformed. Considering that splines are provided at both ends of the drive shaft, the method of using a spline sleeve to fix the drive shaft is more stable and reliable than using a fixture. However, since different-sized drive shafts require the replacement of spline sleeves of different specifications, the spline sleeve needs to be detachably installed on the turntable. And this detachable installation method is prone to problems such as loosening and deformation at the installation site. This application specifically studies and seeks solutions to the problems of loosening and deformation of the spline sleeve installation when using a spline sleeve to fix the drive shaft for torque testing. Summary of the Invention

[0006] (I) Technical Problems to be Solved Aiming at the deficiencies of the prior art, the present invention provides a torque tester dedicated to a drive shaft with splines, which has the advantages of high detection accuracy for the torque-bearing capacity of the drive shaft with splines and solves the problems in the above-mentioned background art.

[0007] (2) Technical solution To achieve the above object, the present invention provides the following technical solution: A torque tester dedicated to a drive shaft with splines is composed of a rotating clamping device and a fixed clamping device. The rotating clamping device is responsible for applying torque to one end of the drive shaft, while the fixed clamping device is used to stabilize the other end of the drive shaft. Splines are provided at both ends of the drive shaft. Rotating clamping seats and fixed seats are respectively provided at the parts where the rotating clamping device and the fixed clamping device are connected to the splines at both ends of the drive shaft. Spline-type fixing jigs are detachably connected to the rotating clamping seats and the fixed seats. The spline-type fixing jig includes a spline sleeve and a mounting seat. A fixing groove with a shape completely consistent with the spline part of the drive shaft is provided on the spline sleeve, and the mounting seat is installed in the mounting groove on the rotating clamping seat or the fixed seat. Force application end detection rings and fixed end detection rings are respectively provided around the mounting grooves of the mounting seats on the rotating clamping seats and the fixed seats. A laser transceiver port is provided on the force application end detection ring, and a reflection groove is provided on the fixed end detection ring at a position corresponding to the laser transceiver port. The spline-type fixing jig further includes a synchronous ring. The synchronous ring is arranged at the part between the spline sleeve and the mounting seat. The synchronous ring bulges outwards. The surface of the synchronous ring close to the mounting seat is in the same plane as the bottom surface of the fixing groove in the spline sleeve. A positioning rod is provided on the surface of the synchronous ring close to the mounting seat. Positioning holes are provided on the force application end detection ring and the fixed end detection ring at positions corresponding to the positioning rod. The positioning rod is inserted into the positioning hole, and when the positioning rod rotates, it drives the force application end detection ring or the fixed end detection ring to rotate.

[0008] Preferably, a strain gauge is attached to the middle position of the drive shaft.

[0009] Preferably, the strain gauge is a constantan strain gauge, and the strain gauge is closely attached to the outer surface of the drive shaft through epoxy resin glue.

[0010] Preferably, a cleaning device is further provided on the testing machine. The cleaning device is of an annular structure. A cavity is provided inside the cleaning device. The cavity is connected to the air outlet of an air pump through a pipeline. A circumferentially distributed air jet nozzle is provided on the inner side of the cleaning device. The air jet nozzle is connected to the cavity inside the cleaning device. By pressurizing air with the air pump, high-pressure gas is sprayed onto the surface of the drive shaft through the cavity and the air jet nozzle to remove water stains and debris on the surface of the drive shaft, so as to fit more closely to the surface of the drive shaft when installing the strain gauge.

[0011] Preferably, a laser emitter and a laser receiver are arranged in the laser transceiver port, and a plurality of steps arranged in sequence according to depth are arranged in the reflection groove, and a reflection layer is arranged on the surface of each step.

[0012] Preferably, the reflection layer is an aluminum coating.

[0013] Preferably, the rotation clamping device includes a roller, a rotation clamping seat is fixedly connected to the end of the roller, the roller is rotatably connected to a rotation support seat, the rotation support seat is fixed on the base, and a torque application device is further connected to the roller, and the torque application device provides a rotation torque for the roller.

[0014] Preferably, the torque application device includes: A force arm, with a force arm fixed in the middle part; A vertical push rod, one end of the force arm far from the force arm is rotatably connected to one end of the vertical push rod, and the other end of the vertical push rod is slidably connected in a vertical hydraulic cylinder; A vertical hydraulic cylinder, the vertical hydraulic cylinder is fixed on the base, the vertical hydraulic cylinder pushes the vertical push rod up or down, and the vertical push rod presses down or up to give the force arm a rotational force, so as to output a torque of a predetermined value for the rotation clamping seat.

[0015] Preferably, the fixed clamping device includes a sliding seat, a fixed seat is fixed on the sliding seat, the sliding seat is slidably connected to a slide rail on the base, one end of the sliding seat is connected to one end of a horizontal push rod, the other end of the horizontal push rod is slidably connected to a horizontal hydraulic cylinder, the horizontal hydraulic cylinder is fixed on the base, by pushing the horizontal push rod by the horizontal hydraulic cylinder, the horizontal push rod pushes the sliding seat to slide, and the sliding seat drives the fixed seat and the spline-type fixed clamp to slide, so as to adjust the distance between the fixed seat and the roller.

[0016] (III) Beneficial effects Compared with the prior art, the present invention provides a torque tester dedicated to a transmission shaft with splines, and has the following beneficial effects: 1. The torque tester dedicated to a drive shaft with splines realizes stable clamping of the drive shaft by setting spline-type fixed clamps on the rotating clamping seat and the fixed seat, and using the fixed slots in the spline sleeve that precisely match the splines of the drive shaft. Compared with traditional simple clamps, the fixing stability of the drive shaft during the test is greatly improved. On the basis of solving the problems of loose installation and deformation of the spline sleeve, the force application end detection ring and the fixed end detection ring are driven to rotate synchronously by the synchronous ring, so that after the spline sleeve is installed, relative rotation between the spline sleeve and the detection ring is prevented circumferentially. Moreover, the spline sleeve is fixed in the positioning hole by the positioning rod, so that its axial direction is also effectively restricted, ensuring that the spline sleeve always remains stable during the torque test of the drive shaft. In addition, the spline-type fixed clamp adopts a detachable connection method, and different specifications of spline sleeves can be conveniently replaced to meet the test requirements of drive shafts of various sizes.

[0017] 2. The torque tester dedicated to a drive shaft with splines sets a synchronous ring outside the spline-type fixed clamp. The bottom surface of the synchronous ring is flush with the inner bottom surface of the spline sleeve. The bottom surface of the synchronous ring drives the force application end detection ring to rotate through the positioning rod, so that the force application end detection ring always maintains the same rotation amount as the inner bottom surface of the spline sleeve. And the rotation amount of the bottom surface of the spline sleeve is the rotation amount of the end of the drive shaft, which can effectively avoid measurement deviation caused by the twisting of the mounting seat when the spline-type fixed clamp is fixed in the rotating clamping seat and subjected to torque, and can improve the detection accuracy.

[0018] 3. The torque tester dedicated to a drive shaft with splines is also provided with a cleaning device in the middle part of the drive shaft. The air nozzle on the cleaning device sprays high-pressure gas on the surface of the drive shaft, which can clean the impurities and water stains on the surface of the drive shaft before starting the detection, and can make the strain gauge better adhere to the surface of the drive shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the structure of the rotating clamping device of the present invention.

[0021] Figure 3 It is a schematic diagram of the structure of the fixed clamping device of the present invention.

[0022] Figure 4 It is a schematic diagram of the structures of the rotating clamping seat and the fixed seat of the present invention.

[0023] Figure 5 It is a sectional view of the rotating clamping seat and the fixed seat of the present invention for fixing the drive shaft.

[0024] Figure 6 It is a sectional view of the spline-type fixed clamp of the present invention during use.

[0025] Figure 7 This is a schematic structural diagram of the rotating clamping seat and the spline-type fixed fixture of the present invention.

[0026] Figure 8 This is a schematic structural diagram of the reflection groove of the present invention.

[0027] In the figure: 1, rotating clamping device; 2, fixed clamping device; 3, cleaning device; 6, transmission shaft; 7, strain gauge; 8, spline-type fixed fixture; 9, base; 11, roller; 12, rotating clamping seat; 13, rotating support seat; 14, torque application device; 141, force arm; 142, vertical push rod; 143, vertical hydraulic cylinder; 121, force application end detection ring; 1211, laser transceiver port; 21, fixed seat; 22, sliding seat; 23, horizontal push rod; 24, horizontal hydraulic cylinder; 25, slide rail; 211, fixed end detection ring; 2111, reflection groove; 81, spline sleeve; 82, mounting seat; 83, synchronizing ring; 831, positioning rod. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0031] Embodiment 1: This embodiment provides a torque tester dedicated to a transmission shaft with splines, having the following technical features.

[0032] Please refer to Figure 1-8 , a torque tester specifically for a drive shaft with splines, which is composed of a rotating clamping device (1) and a fixed clamping device (2). The rotating clamping device (1) is responsible for applying torque to one end of the drive shaft (6), while the fixed clamping device (2) is used to stabilize the other end of the drive shaft (6). Both ends of the drive shaft (6) are provided with splines, and it is characterized in that: The parts of the rotating clamping device (1) and the fixed clamping device (2) connected to the splines at both ends of the drive shaft (6) are respectively provided with a rotating clamping seat (12) and a fixed seat (21). A spline-type fixing fixture (8) is detachably connected to both the rotating clamping seat (12) and the fixed seat (21). The spline-type fixing fixture (8) includes a spline sleeve (81) and a mounting seat (82). A fixing groove with a shape completely consistent with the spline part of the drive shaft (6) is provided on the spline sleeve (81). The mounting seat (82) is installed in the mounting groove on the rotating clamping seat (12) or the fixed seat (21), and its outer side and the inner side of the mounting groove are fixed by mutual engagement of a convex key and a groove; The rotating clamping seat (12) and the fixed seat (21) are respectively provided with a force application end detection ring (121) and a fixed end detection ring (211) around the mounting groove of the mounting seat (82). A laser transceiver port (1211) is provided on the force application end detection ring (121), and a reflection groove (2111) is provided on the fixed end detection ring (211) at a position corresponding to the laser transceiver port (1211); The spline-type fixing fixture (8) further includes a synchronizing ring (83). The synchronizing ring (83) is arranged at the part between the spline sleeve (81) and the mounting seat (82). The synchronizing ring (83) protrudes outwards. The surface of the synchronizing ring (83) close to the mounting seat (82) is in the same plane as the bottom surface of the fixing groove in the spline sleeve (81). A positioning rod (831) is provided on the surface of the synchronizing ring (83) close to the mounting seat (82). Positioning holes are provided on both the force application end detection ring (121) and the fixed end detection ring (211) at positions corresponding to the positioning rod (831). The positioning rod (831) is inserted into the positioning hole, and when the positioning rod (831) rotates, it drives the force application end detection ring (121) or the fixed end detection ring (211) to rotate.

[0033] In an alternative embodiment, a strain gauge 7 is attached to the middle position of the transmission shaft 6. A cleaning device 3 is also provided on the testing machine. The cleaning device 3 is of an annular structure and has a cavity inside. The cavity is connected to the air outlet of an air pump through a pipeline. A circumferentially distributed jet nozzle is provided on the inner side of the cleaning device 3, and the jet nozzle is connected to the cavity inside the cleaning device 3. By pressurizing air with the air pump, high-pressure gas is sprayed onto the surface of the transmission shaft 6 through the cavity and the jet nozzle to remove water stains and debris on the surface of the transmission shaft 6, so as to fit more closely to the surface of the transmission shaft 6 when installing the strain gauge 7.

[0034] It should be noted that two strain gauges 7 are respectively pasted on the opposite sides of the transmission shaft 6, and the axes of the two strain gauges 7 are perpendicular to each other. When the transmission shaft 6 is subjected to a torque, one of the two strain gauges 7 is subjected to tensile strain and the other is subjected to compressive strain. Connecting them to two adjacent arms of a Wheatstone bridge can improve the measurement sensitivity and also play a certain temperature compensation role; alternatively, four strain gauges 7 are pasted on the surface of the transmission shaft 6 to form a full-bridge circuit. Two of the strain gauges 7 are pasted in a direction at an angle of 45° to the axis, and the other two are pasted in a direction at an angle of 135° to the axis. In this way, when the transmission shaft 6 is twisted, the resistance changes of the four strain gauges 7 can be superimposed on each other, thereby further improving the measurement sensitivity and accuracy and better eliminating the influence of factors such as temperature.

[0035] In an alternative embodiment, the strain gauge 7 is a constantan strain gauge, and the strain gauge 7 is closely attached to the outer surface of the transmission shaft 6 through epoxy resin glue.

[0036] In an alternative embodiment, a laser emitter and a laser receiver are provided in the laser transceiver port 1211, and a plurality of steps arranged in sequence according to depth are provided in the reflection groove 2111, and a reflective layer is provided on the surface of each step.

[0037] It should be noted that the drop value between every two adjacent steps is the same.

[0038] In an alternative embodiment, the reflective layer is an aluminum coating.

[0039] In an alternative embodiment, the rotary clamping device 1 includes a roller 11, a rotary clamping seat 12 is fixedly connected to the end of the roller 11, the roller 11 is rotatably connected to a rotary support seat 13, the rotary support seat 13 is fixed on the base 9, and a torque applying device 14 is also connected to the roller 11. The torque applying device 14 provides a rotational torque for the roller 11.

[0040] It should be noted that the torque applying device 14 can be a torque motor, and the output shaft of the torque motor is connected to the roller 11 to output a predetermined value of torque for the roller 11.

[0041] In an alternative embodiment, the torque applying device 14 includes: A force-bearing arm 141, with the middle part thereof fixedly provided with the force-bearing arm 141; A vertical push rod 142, one end of the force-bearing arm 141 remote from the force-bearing arm 141 is rotatably connected to one end of the vertical push rod 142, and the other end of the vertical push rod 142 is slidably connected within a vertical hydraulic cylinder 143; A vertical hydraulic cylinder 143, the vertical hydraulic cylinder 143 is fixed on the base 9, the vertical hydraulic cylinder 143 pushes the vertical push rod 142 upward or downward, and the vertical push rod 142 presses downward or upward to give the force-bearing arm 141 a rotational force, so as to output a torque of a predetermined value to the rotating clamping seat 12.

[0042] In an alternative embodiment, the fixed clamping device 2 includes a sliding seat 22, the fixed seat 21 is fixed on the sliding seat 22, the sliding seat 22 is slidably connected to a slide rail 25 on the base 9, one end of the sliding seat 22 is connected to one end of a horizontal push rod 23, the other end of the horizontal push rod 23 is slidably connected to a horizontal hydraulic cylinder 24, the horizontal hydraulic cylinder 24 is fixed on the base 9, by pushing the horizontal push rod 23 by the horizontal hydraulic cylinder 24, the horizontal push rod 23 pushes the sliding seat 22 to slide, and the sliding seat 22 drives the fixed seat 21 and the spline-type fixed fixture 8 to slide, so as to adjust the distance between the fixed seat 21 and the drum 11.

[0043] In summary, for the torque tester dedicated to a transmission shaft with splines, by providing the spline-type fixed fixture 8 on the rotating clamping seat 12 and the fixed seat 21, and using the fixed slots on the spline sleeve 81 that precisely match the splines of the transmission shaft 6, the stable clamping of the transmission shaft is achieved. Compared with traditional simple fixtures, the fixing stability of the transmission shaft during the test is greatly improved. On the basis of solving the problems of loose installation and deformation of the spline sleeve, by driving the force-applying end detection ring 121 and the fixed-end detection ring 211 to rotate synchronously through the synchronizing ring 83, after the spline sleeve 81 is installed, the relative rotation between the spline sleeve 81 and the detection ring in the circumferential direction is prevented. Moreover, the spline sleeve 81 is fixed in the positioning hole through the positioning rod 831 so that its axial direction is also effectively constrained, ensuring that the spline sleeve 81 always remains stable during the torque test of the transmission shaft. In addition, the spline-type fixed fixture 8 adopts a detachable connection method, and can conveniently replace spline sleeves 8 of different specifications to meet the test requirements of transmission shafts 6 of various sizes.

[0044] When applying torque to the transmission shaft 6, the relative rotation amount of the two end clamps is detected by setting the force application end detection ring 121 and the fixed end detection ring 211 on the rotating clamping seat 12 and the fixed seat 21 that fix the two ends of the transmission shaft 6, so as to judge the overall deflection amount of the transmission shaft 6 when it is subjected to torque, and then judge the torsional resistance of the transmission shaft 6 as a whole. At the same time, a detachable spline-type fixing jig 8 is provided on the rotating clamping seat 12 and the fixed seat 21 for fixing the transmission shaft 6, which not only improves the installation efficiency, but also can be used to fix transmission shafts 6 with different outer diameters by replacing the spline-type fixing jigs 8 with different inner diameter sizes, improving the adaptability of the device. At the same time, the inner hole of the spline-type fixing jig 8 that matches the spline of the transmission shaft 6 can better simulate the actual use scenario during testing.

[0045] For this torque tester dedicated to the transmission shaft with splines, by setting a synchronous ring 83 on the outside of the spline-type fixing jig 8, the bottom surface of the synchronous ring 83 is flush with the bottom surface inside the spline sleeve 81, and the bottom surface of the synchronous ring 83 drives the force application end detection ring 121 to rotate through the positioning rod 831, so that the force application end detection ring 121 always maintains the same rotation amount as the inner bottom surface of the spline sleeve 81, and the rotation amount of the bottom surface of the spline sleeve 81 is the rotation amount of the end of the transmission shaft 6. This can effectively avoid the deviation of measurement caused by the torsion of the mounting seat 82 when the spline-type fixing jig 8 is fixed in the rotating clamping seat 12 and subjected to torque, and can improve the detection accuracy.

[0046] For this torque tester dedicated to the transmission shaft with splines, a cleaning device 3 is also provided in the middle part of the transmission shaft 6. The air nozzle on the cleaning device 3 sprays high-pressure gas on the surface of the transmission shaft 6, which can clean the impurities and water stains on the surface of the transmission shaft 6 before starting the detection, and can make the strain gauge 7 better fit on the surface of the transmission shaft 6.

[0047] It should be noted that in this article, relational terms 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 actual relationship or order between these entities or operations. Moreover, the terms "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A torque tester dedicated to a drive shaft with splines, which is composed of a rotating clamping device (1) and a fixed clamping device (2). The rotating clamping device (1) is responsible for applying torque to one end of the drive shaft (6), while the fixed clamping device (2) is used to stabilize the other end of the drive shaft (6). Both ends of the drive shaft (6) are provided with splines. It is characterized in that: The parts of the rotating clamping device (1) and the fixed clamping device (2) connected to the splines at both ends of the drive shaft (6) are respectively provided with a rotating clamping seat (12) and a fixed seat (21). A spline-type fixing fixture (8) is detachably connected to both the rotating clamping seat (12) and the fixed seat (21). The spline-type fixing fixture (8) includes a spline sleeve (81) and a mounting seat (82). The spline sleeve (81) is provided with a fixing groove whose shape is exactly the same as that of the spline part of the drive shaft (6). The mounting seat (82) is installed in the mounting groove on the rotating clamping seat (12) or the fixed seat (21); The rotating clamping seat (12) and the fixed seat (21) are respectively provided with a force application end detection ring (121) and a fixed end detection ring (211) around the mounting groove of the mounting seat (82). The force application end detection ring (121) is provided with a laser transceiver port (1211). A reflection groove (2111) is provided on the fixed end detection ring (211) at a position corresponding to the laser transceiver port (1211); The spline-type fixing fixture (8) further includes a synchronizing ring (83). The synchronizing ring (83) is arranged at the part between the spline sleeve (81) and the mounting seat (82). The synchronizing ring (83) protrudes outwards. The surface of the synchronizing ring (83) close to the mounting seat (82) is in the same plane as the bottom surface of the fixing groove in the spline sleeve (81). The surface of the synchronizing ring (83) close to the mounting seat (82) is provided with a positioning rod (831). The force application end detection ring (121) and the fixed end detection ring (211) are both provided with positioning holes at positions corresponding to the positioning rod (831). The positioning rod (831) is inserted into the positioning hole, and when the positioning rod (831) rotates, it drives the force application end detection ring (121) or the fixed end detection ring (211) to rotate.

2. The torque tester dedicated to a drive shaft with splines according to claim 1, characterized in that A strain gauge (7) is attached to the middle position of the drive shaft (6).

3. The torque tester dedicated to a transmission shaft with splines according to claim 2, characterized in that, The strain gauge (7) is a constantan strain gauge, and the strain gauge (7) is closely attached to the outer surface of the drive shaft (6) through epoxy resin glue.

4. A torque tester specifically for a drive shaft with splines according to claim 3, characterized in that, A cleaning device (3) is also provided on the testing machine. The cleaning device (3) is of an annular structure. A cavity is provided inside the cleaning device (3). The cavity is communicated with the air outlet of an air pump through a pipeline. The inner side of the cleaning device (3) is provided with jet nozzles distributed circumferentially. The jet nozzles are communicated with the cavity inside the cleaning device (3). By pressurizing air with the air pump, high-pressure gas is sprayed onto the surface of the drive shaft (6) through the cavity and the jet nozzles to remove water stains and debris on the surface of the drive shaft (6), so as to be more closely attached to the surface of the drive shaft (6) when installing the strain gauge (7).

5. A torque tester specifically for a drive shaft with splines according to claim 1, characterized in that, A laser transmitter and a laser receiver are disposed inside the laser transceiver port (1211). A plurality of steps arranged in sequence according to depth are disposed inside the reflection groove (2111), and a reflection layer is disposed on the surface of each step.

6. The torque tester dedicated to a drive shaft with splines according to claim 2, characterized in that The reflection layer is an aluminum coating.

7. A torque tester dedicated to a transmission shaft with splines according to claim 1, characterized in that, The rotation clamping device (1) includes a drum (11). A rotation clamping seat (12) is fixedly connected to the end of the drum (11). The drum (11) is rotatably connected to a rotation support seat (13). The rotation support seat (13) is fixed on a base (9). A torque application device (14) is further connected to the drum (11). The torque application device (14) provides a rotation torque for the drum (11).

8. A torque tester dedicated to a drive shaft with splines according to claim 7, characterized in that, The torque application device (14) includes: A force arm (141), with the force arm (141) fixed in the middle part; A vertical push rod (142). One end of the force arm (141) far from the force arm (141) is rotatably connected to one end of the vertical push rod (142). The other end of the vertical push rod (142) is slidably connected inside a vertical hydraulic cylinder (143); A vertical hydraulic cylinder (143). The vertical hydraulic cylinder (143) is fixed on the base (9). The vertical hydraulic cylinder (143) pushes the vertical push rod (142) upward or downward. The vertical push rod (142) presses downward or upward to give the force arm (141) a rotational force, thereby outputting a torque of a predetermined value for the rotation clamping seat (12).

9. A torque tester dedicated to a transmission shaft with splines according to claim 1, characterized in that, The fixed clamping device (2) includes a sliding seat (22). A fixed seat (21) is fixed on the sliding seat (22). The sliding seat (22) is slidably connected to a slide rail (25) on the base (9). One end of the sliding seat (22) is connected to one end of a horizontal push rod (23). The other end of the horizontal push rod (23) is slidably connected to a horizontal hydraulic cylinder (24). The horizontal hydraulic cylinder (24) is fixed on the base (9). By pushing the horizontal push rod (23) through the horizontal hydraulic cylinder (24), the horizontal push rod (23) pushes the sliding seat (22) to slide. The sliding seat (22) drives the fixed seat (21) and the spline-type fixed fixture (8) to slide, thereby adjusting the distance between the fixed seat (21) and the drum (11).

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