Coupler torsional rigidity test bench

Abstract

A coupler torsional rigidity test bench relates to the technical field of couplings. The problems that an existing coupler torsional rigidity test bench can only test the torsional rigidity of a coupler, the uniform load performance of the coupler cannot be judged, and targeted improvement on parts poor in uniform load performance is inconvenient are solved. The device comprises a coupler, a driving part, and a first support, a second support and a third support which are mounted on a bottom plate, an output shaft of the coupler is fixedly mounted on the first support, the driving part applies torque to an input shaft, an angular displacement sensor and a tension-compression sensor respectively measure angular displacement and tension-compression force corresponding to each measuring point, and the first support, the second support and the third support are mounted on the bottom plate. The torsion rigidity of the coupler can be obtained through the stress sensing element, after the coupler is subjected to the torque effect, the uniform load performance can be judged through the resistance value change of the stress sensing element, stress analysis can be carried out on the deformation condition of the test strip, targeted improvement can be accurately carried out on parts with poor uniform load performance through stress-strain analysis, and therefore the performance of the whole machine is improved.

Description

Technical Field

[0001] The invention relates to the technical field of couplings, and in particular to a coupling torsional rigidity test bench. Background Art

[0002] The torsional stiffness of the coupling directly affects the torsional vibration calculation of the shaft system. Its index is directly related to the safety of the power system operation and is one of the key indicators of the power system design.

[0003] When the current coupling torsional stiffness test bench is tested, the input shaft is first rotated, and then the torsional stiffness of the coupling is calculated through the angular displacement sensor and the tension and compression sensor. However, the above test bench can only test the torsional stiffness of the coupling, and cannot determine the load-sharing performance of the coupling. It is not convenient to make targeted improvements to components with poor load-sharing performance, which makes it difficult to improve the performance of the entire machine.

[0004] In summary, the existing coupling torsional stiffness test bench can only test the torsional stiffness of the coupling, but cannot determine the load-sharing performance of the coupling, making it inconvenient to carry out targeted improvements on components with poor load-sharing performance. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the existing coupling torsional stiffness test bench can only test the torsional stiffness of the coupling, but cannot determine the load-sharing performance of the coupling, and is not convenient for targeted improvement of components with poor load-sharing performance. A coupling torsional stiffness test bench is provided.

[0006] The technical solution of the present invention is: a coupling torsional stiffness test bench, comprising: a coupling, a driving member, and a first bracket, a second bracket, and a third bracket installed on a bottom plate, wherein the output shaft of the coupling is fixedly installed on the first bracket, the input shaft of the coupling is rotatably installed on the second bracket, an angular displacement sensor is connected to the third bracket, a transmission shaft of the angular displacement sensor is fixedly connected to the input shaft, a driving end of the driving member is connected to the input shaft through a tension and compression sensor, and the driving member is used to apply torque to the input shaft;

[0007] Stress sensing elements and test strips are respectively provided on the multiple elastic torque transmission elements of the coupling. When the coupling is subjected to torque, the load-sharing performance is judged by the change in resistance of the stress sensing elements, and stress analysis is performed by the deformation of the test strips.

[0008] Furthermore, the stress sensing element is a stress sheet.

[0009] Furthermore, the test strip is a linear structure.

[0010] Furthermore, the test strip is a circular structure.

[0011] Furthermore, a detection member for observing deformation of the test strip is connected to the coupling.

[0012] Furthermore, the detection component is a microscope.

[0013] Furthermore, a loading rod is fixedly connected to the input shaft, and the driving member includes a first hydraulic cylinder and a second hydraulic cylinder rotatably mounted on the base plate, the first hydraulic cylinder is connected to one end of the loading rod through the tension and compression sensor, and the second hydraulic cylinder is connected to the other end of the loading rod through the tension and compression sensor.

[0014] Further, the distance between the first hydraulic cylinder and the input shaft is greater than the distance between the second hydraulic cylinder and the input shaft.

[0015] Furthermore, the loading rod has weight-reducing grooves penetrating on both sides.

[0016] Furthermore, the first bracket and the second bracket are detachably mounted on the bottom plate.

[0017] Compared with the prior art, the present invention has the following effects:

[0018] 1. In the coupling torsional stiffness test bench provided by the present invention, the driving member applies torque to the input shaft, and the angular displacement sensor and the tension and compression sensor respectively measure the angular displacement and tension and pressure corresponding to each measuring point, so as to obtain the torsional stiffness of the coupling. When the coupling is subjected to torque, the change in resistance of the stress sensing element can determine the load-sharing performance, and the deformation of the test strip can be used for stress analysis. Through stress-strain analysis, targeted improvements can be made to components with poor load-sharing performance, thereby improving the performance of the entire machine.

[0019] 2. The coupling torsional stiffness test bench provided by the present invention has a weight-reducing groove that can reduce the weight of the loading rod, making the loading rod easier to rotate, thereby reducing energy consumption and lowering the cost of use.

[0020] 3. In the coupling torsional stiffness test bench provided by the present invention, the first bracket and the second bracket can move relatively to meet the test of different coupling equipment, and has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the coupling torsional stiffness test bench of the present invention;

[0022] Figure 2 yes Figure 1 Side view of

[0023] Figure 3 yes Figure 1A magnified image of area A;

[0024] Figure 4 yes Figure 3 Cross-sectional view at the middle BB.

[0025] In the figure: 1. coupling; 2. driving member; 3. base plate; 4. first bracket; 5. second bracket; 6. third bracket; 7. output shaft; 8. input shaft; 9. angular displacement sensor; 10. transmission shaft; 11. elastic torque transmission element; 12. stress sensing element; 13. tension and compression sensor; 14. detection member; 15. loading rod; 16. first hydraulic cylinder; 17. second hydraulic cylinder; 18. weight reduction groove. DETAILED DESCRIPTION

[0026] Specific implementation method 1: Specific implementation method 1: Combination Figures 1 to 4 The present embodiment is described, and the present embodiment includes a coupling 1, a driving member 2, and a first bracket 4, a second bracket 5, and a third bracket 6 mounted on a base plate 3. The output shaft 7 of the coupling 1 is fixedly mounted on the first bracket 4, the input shaft 8 of the coupling 1 is rotatably mounted on the second bracket 5, an angular displacement sensor 9 is connected to the third bracket 6, a transmission shaft 10 of the angular displacement sensor 9 is fixedly connected to the input shaft 8, a driving end of the driving member 2 is connected to the input shaft 8 via a tension and compression sensor 13, the driving member 2 is used to apply torque to the input shaft 8, and a plurality of elastic torque transmission elements 11 of the coupling 1 are respectively provided with stress sensing elements 12 and test strips. When the coupling 1 is subjected to torque, the load-sharing performance is judged by the change in resistance of the stress sensing element 12, and stress analysis is performed by the deformation of the test strip. In the present embodiment, the elastic torque transmission element 11 may be a rubber metal ring.

[0027] In the coupling torsional stiffness test bench of this embodiment, the driving member 2 applies torque to the input shaft 8, and the angular displacement sensor 9 and the tension and compression sensor 13 respectively measure the angular displacement and tension and pressure corresponding to each measuring point, so as to obtain the torsional stiffness of the coupling 1. When the coupling 1 is subjected to torque, the change in resistance of the stress sensing element 12 can determine the load-sharing performance, and the deformation of the test strip can be used for stress analysis. Through stress-strain analysis, targeted improvements can be made to components with poor load-sharing performance, thereby improving the performance of the entire machine.

[0028] Specific implementation method 2: Combination Figure 4 This embodiment is described. The difference between this embodiment and the first embodiment is that the stress sensing element 12 is a stress gauge. When the strain gauge is deformed by force, its resistance value will change. The change in its resistance value is used to determine the load-sharing performance. Other components and connection relationships are the same as those of the first embodiment.

[0029] Specific implementation method three: Combination Figure 4This embodiment is described. The difference between this embodiment and the first embodiment is that the test strip is a linear structure. After the test strip is deformed by force, the change is more obvious due to its linear structure, which is convenient for stress analysis. The other components and connection relationships are the same as the first embodiment.

[0030] Specific implementation method four: Combination Figure 4 This embodiment is described. The difference between this embodiment and the first embodiment is that the test strip is a circular structure. After the test strip is deformed by force, the change is more obvious due to its circular structure, which is convenient for stress analysis. The other components and connection relationships are the same as those of the first embodiment.

[0031] Specific implementation method five: Combination Figure 3 This embodiment is described. The difference between this embodiment and the first embodiment is that the coupling 1 is connected with a detection member 14 for observing the deformation of the test strip. The detection member 14 can amplify the deformation of the test strip, which is convenient for the staff to perform stress analysis and make the analysis result more accurate. The other components and connection relationships are the same as those of the first embodiment.

[0032] Specific implementation method six: Combination Figure 3 This embodiment is described. The difference between this embodiment and the fifth embodiment is that the detection member 14 is a microscope, which has a better magnification effect, so that the deformation of the test strip seen by the staff is more detailed, making the stress analysis easier and more accurate. Of course, the detection member 14 can also be a camera. The other components and connection relationships are the same as those of the fifth embodiment.

[0033] Specific implementation method seven: Combination Figure 2 This embodiment is described. The difference between this embodiment and the specific embodiment 1 is that a loading rod 15 is fixedly connected to the input shaft 8, and the driving member 2 includes a first hydraulic cylinder 16 and a second hydraulic cylinder 17 rotatably mounted on the base plate 3. The first hydraulic cylinder 16 is connected to one end of the loading rod 15 through a tension and compression sensor 13, and the second hydraulic cylinder 17 is connected to the other end of the loading rod 15 through a tension and compression sensor 13. The joint action of the two hydraulic cylinders can transfer the torque to the input shaft 8 through the loading rod 15, thereby driving the input shaft 8 to rotate, and the hydraulic cylinder driving force is relatively large. It is convenient to adjust according to actual conditions, and the test range is wider. Other components and connection relationships are the same as any one of the specific embodiments 1 to 6.

[0034] Specific implementation method eight: Combination Figure 2This embodiment is described. The difference between this embodiment and the seventh embodiment is that the distance between the first hydraulic cylinder 16 and the input shaft 8 is greater than the distance between the second hydraulic cylinder 17 and the input shaft 8. When the first hydraulic cylinder 16 and the second hydraulic cylinder 17 act, the force arms of the two are different. The loading rod 15 is equivalent to a lever. The first hydraulic cylinder 16 can obtain a larger torque with a smaller force. The first hydraulic cylinder 16 and the second hydraulic cylinder 17 jointly drive the input shaft 8 to rotate toward the driving direction of the first hydraulic cylinder 16, and the rotation of the input shaft 8 is more convenient. The other components and connection relationships are the same as those of the seventh embodiment.

[0035] Specific implementation method nine: Combination Figure 2 This embodiment is described. The difference between this embodiment and the seventh embodiment is that the loading rod 15 has weight-reducing grooves 18 passing through both sides. The weight-reducing grooves 18 can reduce the weight of the loading rod 15, making it easier for the loading rod 15 to rotate, thereby reducing energy consumption and lowering the cost of use. The other components and connection relationships are the same as those of the seventh embodiment.

[0036] Specific implementation method ten: Combination Figure 1 This embodiment is described. The difference between this embodiment and the specific embodiment 1 is that the first bracket 4 and the second bracket 5 are detachably mounted on the bottom plate 3, and can be mounted on the bottom plate 3 by bolts. The first bracket 4 and the second bracket 5 can move relative to each other to meet the test of different coupling 1 devices, and have good versatility. The other components and connection relationships are the same as any one of the specific embodiments 1 to 6.

[0037] The test method of this embodiment:

[0038] Hydraulic oil is provided to the first hydraulic cylinder 16 and the second hydraulic cylinder 17 through the loading oil station, so that the first hydraulic cylinder 16 pushes up the loading rod 15 through the tension and compression sensor 13, and the second hydraulic cylinder 17 pulls down the loading rod 15 through the tension and compression sensor 13. The loading rod 15 transmits the torque to the input shaft 8, and the input shaft 8 drives the coupling 1 to twist, and applies torque to the input end of the coupling 1 (the applied torque is converted by measuring the loading oil pressure). The output end of the coupling 1 is fixed to the first bracket 4 through the output shaft 7. After the torque loading is maintained for a certain period of time, the status of each component is checked, and the torsional angle difference between the input end and the output end of the coupling 1 is measured through the transmission shaft 10 installed on the angular displacement sensor 9, and then the torsional stiffness of the coupling 1 is obtained.

[0039] The coupling 1 is loaded by adjusting the system pressure, and the torsion angle under different torques is tested, thereby obtaining the torsional stiffness of the coupling 1 under different torques. There are 36 elastic torque transmission elements 11 in the coupling 1, each of which is equipped with a stress sensing element 12. The contact surface and point stress analysis is performed through a slight change in the resistance value of the stress sensing element 12. At the same time, a test strip is engraved on the elastic torque transmission element 11, and the deformation of the test strip on the elastic torque transmission element 11 is measured through a microscope after the test piece is subjected to force. The above method can be used to judge the load-sharing performance of the coupling 1, and the stress-strain analysis can be used to accurately and targetedly improve the components with poor load-sharing performance, thereby improving the performance of the entire machine.

[0040] The content of the present invention is not limited to the content of the above-mentioned embodiments. The combination of one or several specific embodiments can also achieve the purpose of the invention.

Claims

1. A coupling torsional stiffness test bench, comprising: A coupling (1), a driving member (2), and a first bracket (4), a second bracket (5), and a third bracket (6) mounted on a base plate (3); the output shaft (7) of the coupling (1) is fixedly mounted on the first bracket (4); the input shaft (8) of the coupling (1) is rotatably mounted on the second bracket (5); an angular displacement sensor (9) is connected to the third bracket (6); a transmission shaft (10) of the angular displacement sensor (9) is fixedly connected to the input shaft (8); a driving end of the driving member (2) is connected to the input shaft (8) via a tension and compression sensor (13); and the driving member (2) is used to apply torque to the input shaft (8); The invention is characterized in that stress sensing elements (12) and test strips are respectively arranged on the plurality of elastic torque transmission elements (11) of the coupling (1); when the coupling (1) is subjected to torque, the load-sharing performance is judged by the change in resistance of the stress sensing element (12), and stress analysis is performed by the deformation of the test strip.

2. A coupling torsional stiffness test bench according to claim 1, characterized in that: The stress sensing element (12) is a stress sheet.

3. A coupling torsional stiffness test bench according to claim 1, characterized in that: The test strip is a linear structure.

4. A coupling torsional stiffness test bench according to claim 1, characterized in that: The test strip is a circular structure.

5. A coupling torsional stiffness test bench according to claim 1, characterized in that: The coupling (1) is connected to a detection member (14) for observing the deformation of the test strip.

6. A coupling torsional stiffness test bench according to claim 5, characterized in that: The detection component (14) is a microscope.

7. A coupling torsional stiffness test bench according to any one of claims 1 to 6, characterized in that: A loading rod (15) is fixedly connected to the input shaft (8), and the driving member (2) comprises a first hydraulic cylinder (16) and a second hydraulic cylinder (17) rotatably mounted on the base plate (3), the first hydraulic cylinder (16) being connected to one end of the loading rod (15) via the tension and compression sensor (13), and the second hydraulic cylinder (17) being connected to the other end of the loading rod (15) via the tension and compression sensor (13).

8. A coupling torsional stiffness test bench according to claim 7, characterized in that: The distance between the first hydraulic cylinder (16) and the input shaft (8) is greater than the distance between the second hydraulic cylinder (17) and the input shaft (8).

9. A coupling torsional stiffness test bench according to claim 7, characterized in that: The loading rod (15) has weight-reducing grooves (18) penetrating on both sides.

10. A coupling torsional stiffness test bench according to any one of claims 1 to 6, characterized in that: The first bracket (4) and the second bracket (5) are detachably mounted on the base plate (3).

Images