A high-precision test bench for static and dynamic performance of couplings

Abstract

The invention discloses a high-precision test bench for static and dynamic performance of a coupling, comprising a bench provided with a horizontal surface, and a vertical mounting part and a loading part of a coupling installed on the bench, wherein the vertical mounting part of the coupling is provided with a vertical transmission shaft torque input end, and the loading part comprises a coupling block, wherein the coupling block is sleeved on the transmission shaft torque input end, a horizontally arranged spring column is connected to one side of the coupling block, an eccentric swing mechanism is connected to the spring column, and the eccentric swing mechanism comprises two rotating pressure wheels, wherein the two rotating pressure wheels are respectively arranged on both sides of the spring column, the rotating pressure wheels are installed in a support frame, and a swing transmission block is embedded in the lower part of the support frame, wherein the swing transmission block is sleeved on the upper end of the eccentric shaft, and the lower end of the eccentric shaft is connected to the output shaft of the motor. The invention can realize the precise adjustment of the output torque and the output torsion angle, has high test accuracy, and is easy to manufacture.

Description

Technical Field

[0001] The invention relates to a coupling test bench, in particular to a coupling static and dynamic performance high-precision test bench. Background Art

[0002] As an indispensable component in the mechanical transmission process, the coupling plays an important role in transmitting torque. Therefore, in order to better understand the performance indicators of the coupling, a set of special testing instruments is needed to test the performance of the coupling. However, most of the coupling test benches on the market currently adopt a horizontal structure and use a guide rail slider mechanism to facilitate the clamping of the coupling. When the coupling is tested, the torque will eventually react to the guide rail. The structural stiffness of the horizontal structure test bench is determined by the weak link of the guide rail slider; the horizontal structure will have a certain impact on the test results due to the gravity of the shaft system itself. The horizontal structure test bench of the coupling generally has low accuracy and it is difficult to meet the high-precision detection of the static and dynamic performance of the coupling. In addition, when measuring the dynamic performance indicators of the coupling, the torsion frequency is required to be high. The high-frequency torsion of 20Hz under a small angle displacement has very high requirements for the drive motor, which is difficult to achieve with ordinary motors. Therefore, it is necessary to design a new coupling test bench. Summary of the invention

[0003] The present invention provides a high-precision test bench for testing the static and dynamic performance of a coupling to solve the technical problems existing in the known technology. The test bench can realize precise adjustment of the output torque and the output torsion angle, has high testing accuracy, and is easy to manufacture.

[0004] The technical solution adopted by the present invention to solve the technical problems existing in the known technology is: a high-precision test bench for static and dynamic performance of a coupling, comprising a bench with a horizontal surface and a vertical mounting part and a loading part of a coupling installed on the bench, the vertical mounting part of the coupling is provided with a vertical transmission shaft torque input end, the loading part comprises a coupling block, the coupling block is sleeved on the transmission shaft torque input end, a horizontally arranged swing rod is connected to one side of the coupling block, an eccentric swing mechanism is connected to the swing rod, the eccentric swing mechanism comprises two rotating pressure wheels, the two rotating pressure wheels are respectively provided with The eccentric shaft is mounted on both sides of the swing arm, the rotating pressure wheel is mounted in the support frame, a swing transmission block is embedded in the lower part of the support frame, the swing transmission block is sleeved on the upper end of the eccentric shaft, the lower end of the eccentric shaft is connected to the output shaft of the motor, a horizontal limit block is connected to the end of the swing arm away from the coupling block, the horizontal limit block is inserted in the limit groove, the limit groove is arranged on the fixed block, the fixed block is mounted on the lower surface of the horizontal platform, the motor is mounted on the sliding plate, the sliding plate is connected to the guide rail through a slider, and the guide rail is parallel to the swing arm and fixed on the lower surface of the horizontal platform.

[0005] The vertical mounting part of the coupling includes a torque cylinder vertically fixed on the horizontal surface, the torque cylinder has a cover plate fixedly connected to the top, and an installation operation port is provided on one side, a lower transmission shaft vertically connected to the horizontal surface and an upper transmission shaft coaxially arranged with the lower transmission shaft are provided in the torque cylinder, the upper transmission shaft is connected to the cover plate through a torque sensor, the lower transmission shaft is connected to the horizontal surface through a bearing, a split lower transfer interface connected to a lower connecting shaft head is provided at the upper end of the lower transmission shaft, the lower connecting shaft head is inserted in the lower part of the vertically arranged detection coupling, a grating turntable is installed on the lower transmission shaft, a split upper transfer interface connected to an upper connecting shaft head is provided at the lower end of the upper transmission shaft, the upper connecting shaft head is inserted in the upper part of the vertically arranged detection coupling, and the lower end of the lower transmission shaft is the torque input end of the transmission shaft, which is located below the horizontal surface.

[0006] The sliding plate is driven by a translation mechanism, and the translation mechanism is fixed on the lower surface of the horizontal platform.

[0007] The translation mechanism adopts a screw transmission mechanism.

[0008] The lower transmission shaft adopts a tapered shank tool arbor shaft, and the coupling block adopts a tapered shank seat.

[0009] The split upper transfer interface and the split lower transfer interface both adopt a clamp structure.

[0010] The motor is a servo motor.

[0011] The advantages and positive effects of the present invention are as follows: 1) By using a vertically installed torque cylinder to support a vertically installed coupling, the adverse effect of the shaft system gravity on the test result can be avoided. The vertically installed torque cylinder that bears the torque can improve the torsional stiffness of the test bench, thereby improving the test accuracy. 2) A split-type adapter clamp coupling assembly is adopted, and the coupling assembly is installed laterally, which is convenient to install and has high centering accuracy, and can improve the test accuracy and test efficiency. 3) By using an eccentric swing mechanism to drive the swing rod to flex and deform and swing to apply torque to the transmission shaft, the flexural deformation of the swing rod can offset part of the eccentricity of the eccentric shaft, reduce the swing amplitude of the swing mechanism, reduce the output of the torsion angle, meet the torque and small torsion angle required for the coupling test, and reduce the processing difficulty of the eccentric shaft. At the same time, the eccentric swing mechanism solves the problem that the high-frequency reciprocating swing of the swing rod requires high-frequency commutation, has low requirements on the drive motor, and is easy to control. 4) The translation mechanism is used to adjust the length of the swing rod force arm, which can achieve precise adjustment of the output torque and output torsion angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention;

[0013] Figure 2 It is a structural schematic diagram of the vertical installation part of the coupling of the present invention;

[0014] Figure 3 It is a schematic structural diagram of the loading part of the present invention;

[0015] Figure 4 It is a structural schematic diagram of the eccentric swing mechanism of the present invention;

[0016] Figure 5 It is a schematic structural diagram of the eccentric swing mechanism of the present invention being assembled on the swing rod.

[0017] In the figure: 1. stand; 1-1. horizontal table surface; 2-1. cover plate; 2-2. torque cylinder; 2-3. grating turntable; 2-4. bearing; 2-5. lower transmission shaft; 2-6. split lower transfer interface; 2-7. lower connecting shaft head; 2-8. upper connecting shaft head; 2-9. split upper transfer interface; 2-10. upper transmission shaft; 2-11. torque sensor; 3-1. coupling block; 3-2. rocker arm; 3-3. support frame; 3-4. rotating pressure wheel; 3-5. swing transfer block; 3-6. eccentric shaft; 3-7. motor; 3-8. sliding plate; 3-9. fixed block; 3-10. horizontal limit block; 3-11. translation mechanism; 3-12. slider; 3-13. guide rail. DETAILED DESCRIPTION

[0018] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0019] See also Figure 1 to Figure 5 A test bench for testing a horizontal deflection coupling comprises a frame 1 provided with a horizontal surface 1-1 and a coupling vertical mounting part and a loading part mounted on the frame 1.

[0020] The vertical installation part of the coupling is provided with a vertical transmission shaft torque input end.

[0021] The loading part includes a coupling block 3-1, and the coupling block 3-1 is sleeved on the torque input end of the transmission shaft. A horizontally arranged rocking rod 3-2 is connected to one side of the coupling block 3-1, and an eccentric swing mechanism is connected to the rocking rod 3-2. The eccentric swing mechanism includes two rotating pressure wheels 3-4, and the two rotating pressure wheels 3-4 are respectively arranged on both sides of the rocking rod 3-2. The rotating pressure wheels 3-4 are installed in a supporting frame 3-3, and a swing transmission block 3-5 is embedded in the lower part of the supporting frame 3-3. The swing transmission block 3-5 is sleeved on the upper end of the eccentric shaft 3-6. The lower end of the spindle 3-6 is connected to the output shaft of the motor 3-7; a horizontal limit block 3-10 is connected to the end of the rocker arm 3-2 away from the coupling block 3-1, and the horizontal limit block 3-10 is inserted in the limit groove, and the limit groove is arranged on the fixed block 3-9, and the fixed block 3-9 is installed on the lower surface of the horizontal platform 1-1; the motor 3-7 is installed on the sliding plate 3-8, and the sliding plate 3-8 is connected to the guide rail 3-13 through the slider 3-12, and the guide rail 3-13 is parallel to the rocker arm 3-2 and fixedly installed on the lower surface of the horizontal platform 1-1.

[0022] In this embodiment, the vertical mounting part of the coupling includes a torque cylinder 2-2 vertically fixed on the horizontal surface 1-1, the torque cylinder 2-2 has a cover plate 2-1 fixedly connected to the top, and an installation operation port is provided on one side, and a lower transmission shaft 2-5 vertically connected to the horizontal surface 1-1 and an upper transmission shaft 2-10 coaxially arranged with the lower transmission shaft 2-5 are provided in the torque cylinder 2-2, the upper transmission shaft 2-10 is connected to the cover plate 2-1 through a torque sensor 2-11, the lower transmission shaft 2-5 is connected to the horizontal surface 1-1 through a bearing 2-4, and a split lower transfer interface 2-6 connected to a lower connecting shaft head 2-7 is provided at the upper end of the lower transmission shaft 2-5, the lower connecting shaft head 2-7 is inserted in the lower part of the vertically arranged detection coupling, and a grating turntable 2-3 is installed on the lower transmission shaft 2-5 for detecting the torsion angle. A split upper transfer interface 2-9 connected to an upper connecting shaft head 2-8 is provided at the lower end of the upper transmission shaft 2-10, and the upper connecting shaft head 2-8 is inserted in the upper part of the vertically arranged detection coupling, and the lower end of the lower transmission shaft 2-5 is the torque input end of the transmission shaft, which is located below the horizontal platform surface 1-1. The above structure is simple and easy to operate.

[0023] In this embodiment, the sliding plate 3-8 is driven by a translation mechanism 3-11, and the translation mechanism 3-11 is fixed on the lower surface of the horizontal platform 1-1. More specifically, the translation mechanism 3-11 adopts a spiral transmission mechanism, which has a simple structure and is easy to manufacture.

[0024] In this embodiment, the lower transmission shaft 2-5 adopts a tapered shank tool shaft, and the coupling block 3-1 adopts a tapered shank seat, which is convenient for fixed connection between the two. Commercially available finished products can be used to ensure quality and reduce costs.

[0025] In this embodiment, the split upper transfer interface 2-9 and the split lower transfer interface 2-6 both adopt a clamp structure, which is simple and reliable.

[0026] In this embodiment, the motors 3-7 are servo motors for ease of control.

[0027] When in use, the clamp structures of the split upper transfer interface 2-9 and the split lower transfer interface 2-6 are opened, the lower connecting shaft head 2-7 and the upper connecting shaft head 2-8 are respectively inserted into the detection coupling, and then the components are installed into the split upper transfer interface 2-9 and the split lower transfer interface 2-6 through the installation operation port and locked. The translation mechanism 3-11 is started to drive the eccentric swing mechanism to move along the length direction of the swing rod 3-2, the length of the swing rod force arm is adjusted, and the eccentric swing mechanism is started to drive the swing rod 3-2 to swing, changing the magnitude of the force.

[0028] When the rocker arm 3-2 outputs torque, the torsion angle is very small. For example, the rated torque of some couplings is 150NM. Due to the different elastic stiffness coefficients, the torsion angle range during testing may be 0.045~0.055. This requires the eccentric swing mechanism to have a smaller swing amplitude, and the eccentricity requirement of the eccentric shaft will be stricter. The eccentric shaft is difficult to process. To solve this problem, a flexible rocker arm is designed to increase the eccentricity of the eccentric shaft. The increased eccentricity is offset by the flexural deformation of the rocker arm to ensure that the output torque and torsion angle are appropriate.

[0029] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can make many forms without departing from the scope of protection of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A high-precision test bench for static and dynamic performance of couplings, characterized in that: It includes a stand with a horizontal surface and a coupling vertical installation part and a loading part installed on the stand. The vertical mounting part of the coupling is provided with a vertical transmission shaft torque input end. The loading part includes a coupling block, the coupling block is sleeved on the torque input end of the transmission shaft, a horizontally arranged swing rod is connected to one side of the coupling block, an eccentric swing mechanism is connected to the swing rod, and the eccentric swing mechanism includes two rotating pressure wheels, the two rotating pressure wheels are respectively arranged on both sides of the swing rod, the rotating pressure wheels are installed in the support frame, a swing transmission block is embedded in the lower part of the support frame, the swing transmission block is sleeved on the upper end of the eccentric shaft, the lower end of the eccentric shaft is connected to the output shaft of the motor, a horizontal limit block is connected to the end of the swing rod away from the coupling block, the horizontal limit block is inserted in the limit groove, the limit groove is arranged on the fixed block, the fixed block is installed on the lower surface of the horizontal platform, the motor is installed on the sliding plate, the sliding plate is connected to the guide rail through a slider, and the guide rail is parallel to the swing rod and fixed on the lower surface of the horizontal platform; The vertical mounting part of the coupling comprises a torque cylinder vertically fixed on the horizontal platform surface, the torque cylinder has a cover plate fixedly connected to the top, and an installation operation port is provided on one side, a lower transmission shaft vertically connected to the horizontal platform surface and an upper transmission shaft coaxially arranged with the lower transmission shaft are provided in the torque cylinder, the upper transmission shaft is connected to the cover plate through a torque sensor, the lower transmission shaft is connected to the horizontal platform surface through a bearing, a split lower transfer interface connected to a lower connecting shaft head is provided at the upper end of the lower transmission shaft, the lower connecting shaft head is inserted in the lower part of the vertically arranged detection coupling, a grating turntable is installed on the lower transmission shaft, a split upper transfer interface connected to an upper connecting shaft head is provided at the lower end of the upper transmission shaft, the upper connecting shaft head is inserted in the upper part of the vertically arranged detection coupling, and the lower end of the lower transmission shaft is the torque input end of the transmission shaft, which is located below the horizontal platform surface; The sliding plate is driven by a translation mechanism, and the translation mechanism is fixed on the lower surface of the horizontal platform.

2. The high-precision test bench for static and dynamic performance of coupling according to claim 1 is characterized in that: The translation mechanism adopts a screw transmission mechanism.

3. The high-precision test bench for static and dynamic performance of coupling according to claim 1 is characterized in that: The lower transmission shaft adopts a tapered shank tool arbor shaft, and the coupling block adopts a tapered shank seat.

4. The high-precision test bench for static and dynamic performance of coupling according to claim 1 is characterized in that: The split upper transfer interface and the split lower transfer interface both adopt a clamp structure.

5. The high-precision test bench for static and dynamic performance of coupling according to claim 1 is characterized in that: The motor is a servo motor.

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