Testing device capable of loading periodic bending moment load

Abstract

The invention discloses a test device capable of loading a periodic bending moment load. The test device comprises a force loading device, a force bearing disc and an output shaft, the force loading device is fixed on equipment and is a fixed part, and the force bearing disc is coaxially connected with the output shaft to form a rotating part. The force loading device is eccentrically arranged relative to the axis of the force bearing disc, and protrusions are distributed on the force bearing disc in the circumferential direction. When the force bearing disc rotates, the protrusions on the force bearing disc make contact with the force contact assembly on the force loading device, the periodic eccentric axial force is passively received, the periodic bending moment load is generated, and then the periodic bending moment load is transmitted to the output shaft end of the tested motor or speed reducer. The structure has the advantages of only comprising a mechanical structure, being simple and reliable, being low in cost and being adjustable in different bending moment working conditions. The force loading device can further select an active servo forcing device, and at the moment, the disc surface of the force bearing disc does not need to be protruded. The servo force loading device applies eccentric axial force to the force bearing disc according to a certain frequency so as to generate a periodic bending moment load, and the magnitude and the frequency can be adjusted in real time.

Description

TECHNICAL FIELD

[0001] The present application relates to a test device for power equipment such as motors, engines, reducers, hydraulic-motor, etc., and in particular to a test simulation for reliability in the case of a motor or a reducer driving a rotor. BACKGROUND

[0002] Currently, due to the vigorous development of new energy eVTOL, distributed electric drive is widely used, that is, the aircraft is directly driven by multiple motors or cooperates with reducers to provide vertical take-off power. In the process of vertical take-off or horizontal flight of the aircraft, it is easy to be disturbed by airflow in the forward and lateral directions, and then a periodic bending moment load is generated on the rotor; the bending moment load acts once every certain angle of rotation of the rotor. The bending moment load is ultimately transmitted to the output shaft of the motor or reducer through the hub at the center of the rotor, and then causes the mechanical structure of the motor or reducer to deform or the shaft system to be damaged, etc.

[0003] In order to test the influence of such periodic bending moment on reliability, the motor or reducer is often tested for durability in the wind tunnel together with the rotor, which greatly occupies the wind tunnel resources and has high cost; other alternative test schemes, such as using a ground vehicle to carry the motor or reducer together with the rotor, and driving at a certain speed to bring a certain wind flow to test, also have very high cost and require very wide test sites.

[0004] Based on the above problems, it is imperative to design a test device that can simulate periodic bending moment load on the test bench. The present application can realize periodic loading of bending moment in the circumferential direction and realize adjustable and controllable bending moment size, greatly saving the test cost.

[0005] After investigation, no similar bending moment loading equipment is found. SUMMARY

[0006] The technical problem to be solved by the present application is to load periodic bending moment load on the power transmission shaft to test the system reliability on the test bench.

[0007] To solve the above technical problems, the test device for loading periodic bending moment provided by the present application comprises a force loading device, a force receiving disc and an output shaft.

[0008] The force loading device is fixed on the equipment as a fixed part, and the force receiving disc is coaxially connected to the output shaft to form a rotating part. The force loading device is eccentrically arranged relative to the axis of the force receiving disc, which generates a bending moment load by applying an eccentric periodic axial force to the force receiving disc and transmitting it to the output shaft. The output shaft is connected to the power output end of the motor or reducer.

[0009] The force loading device comprises an energy storage element, a force contact structure, and a pressure plate support. The energy storage element generates a certain pre-stored elastic force under the action of the pressure plate support. The force loading device can be multiple, and the number and distribution position thereof can be adjusted according to the actual load of the simulated test.

[0010] Optionally, the energy storage element can be various elastic elements such as springs. More preferably, the energy storage element can be a hydraulic cylinder, a pneumatic cylinder, an electric cylinder, a rubber elastic body, or an air bag.

[0011] The contact friction part of the force contact structure can be a sliding friction structure or a rolling friction structure. Optionally, the force contact structure can be a protrusion, a ball, or a roller made of low-friction material.

[0012] The pressure plate support restricts the force contact structure and the energy storage element in a certain space range through the through-hole bayonet on the pressure plate support. At this time, the energy storage element is pre-loaded, and the head of the force contact structure protrudes from the through-hole bayonet to a certain height of the pressure plate support, which is slightly lower than the protrusion height of the load-bearing disc.

[0013] The load-bearing disc is a disc structure, and there is a gap between the disc surface and the pressure plate support, which is slightly larger than the height of the head of the force contact structure protruding from the pressure plate support. When the disc surface rotates, the disc surface does not contact the head of the force contact structure.

[0014] There are also multiple smaller protrusions on the load-bearing disc surface in the circumferential direction, which are arranged at a certain angle on the same index circle. The height of the protrusions is slightly smaller than the gap between the disc surface of the load-bearing disc and the pressure plate support. The number and distribution angle of the protrusions are determined according to the actual situation of the simulated load.

[0015] When the output shaft drives the load-bearing disc to rotate, the protrusions on the load-bearing disc rotate to the head of the force contact structure, the protrusions are pressed to the force contact structure, and the bayonet of the pressure plate support is separated from the force contact structure. At this time, the pressing force is almost equal to the pre-stored force of the energy storage element; the pressing force acts on the load-bearing disc through the protrusions, and finally generates a bending moment on the output shaft. With the rotation of the load-bearing disc, the protrusions intermittently press the force contact structure, and the process is repeated, thereby realizing periodic bending moment loading.

[0016] Optionally, the protrusions can also be a protrusion, a steel ball, or a roller made of low-friction material, to reduce the friction and impact during each action.

[0017] The structure has the advantages of simple and reliable mechanical structure, low cost, and the size of the applied bending moment can be adjusted by adjusting the diameter of the index circle of the protrusions of the load-bearing disc and the pre-stored force of the force loading device, thereby realizing the simulation of different bending moment working conditions.

[0018] The present application provides another optional solution: Based on the above, the force loading device can select servo motor, servo cylinder, servo hydraulic cylinder and other active servo force loading device.

[0019] The force bearing disc surface is free of protrusions. The disc surface is directly connected with the force loading device through sliding or rolling structure.

[0020] Optionally, the sliding or rolling structure can be low friction material contact pair, ball, roller. Further, bearing capable of bearing axial force can be selected.

[0021] Through servo system control, the force loading device applies force to the force bearing disc according to certain frequency, thereby generating periodic bending moment load and adjusting size and frequency in real time.

[0022] The present application has the advantages of: Periodic bending moment loading of the shafting can be realized, and the bending moment can be adjusted. If the force loading device adopts servo system, real-time adjustment of the periodic bending moment can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the present application, the drawings used in the present application will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 is a structural schematic diagram of a test device capable of loading periodic bending moment load; Figure 2 is a cross-sectional structure diagram of the force loading device; Figure 3 is a schematic diagram of optional force contact structure; Figure 4 is a bending moment loading illustration; Figure 5 is a schematic diagram of optional servo force loading device a; Figure 6 is a schematic diagram of optional servo force loading device b; DETAILED DESCRIPTION

[0025] The technical solutions in the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. EMBODIMENT

[0026] As Figure 1Test device capable of loading periodic bending moment load, comprising force loading device 1, force bearing disc 2, output shaft 3. The force loading device 1 is a fixed part, the force bearing disc 2 is coaxial with the output shaft 3 and connected to form a rotating part. The force loading device 3 is arranged eccentrically relative to the axis of the force bearing disc 2. Embodiment

[0027] As Figure 2 , the force loading device 1 comprises energy storage element 11, force contact structure 12, pressing plate support 13.

[0028] The pressing plate support 13, through the through hole card hole on it, sequentially presses the force contact structure 12 and the energy storage element 11, so that the energy storage element 11 realizes preloading, at this time the head of the force contact structure 12 protrudes out of the pressing plate support 13 by a certain height, which is slightly lower than the gap between the pressing plate support 13 and the force bearing disc 2.

[0029] Optionally, the energy storage element 11 can be various elastic elements such as springs. More preferably, hydraulic cylinders, air cylinders, electric cylinders, rubber elastic bodies, air bags, etc. Embodiment

[0030] As Figure 3 , the contact and friction part of the force contact structure 12 adopts the form of rolling friction such as ball and roller. Embodiment

[0031] As Figure 4 , the force bearing disc 2 is a disc structure, and the disc surface 21 has a gap with the pressing plate support 13, and the gap is slightly larger than the height of the head of the force contact structure 12 protruding out of the pressing plate support. When the disc surface 21 rotates, the disc surface will not be in contact with the head of the force contact structure 12.

[0032] There are also a plurality of smaller protrusions 22 on the force bearing disc 2 in the circumferential direction, which are arranged at a certain angle on the same index circle, and the height of the protrusions 22 is slightly smaller than the gap between the disc surface 21 of the force bearing disc 1 and the pressing plate support 13.

[0033] When the output shaft 3 drives the force bearing disc 2 to rotate together, the protrusions 22 on the force bearing disc 2 rotate to the head of the force contact structure 12, the protrusions 22 are extruded to the force contact structure 12, and the card hole of the pressing plate support 13 is separated from the force contact structure 12, at this time the force pre-stored by the energy storage element 11 acts on the force bearing disc 2 through the protrusions 22, and finally generates a bending moment on the output shaft 3.

[0034] Optionally, the protrusions 22 can also adopt structures such as protrusions made of low-friction materials, steel balls, and rollers to reduce friction and impact during each action. Embodiment

[0035] Another optional scheme: Based on the above,Figure 5 The force loading device 1 can be selected from active servo force loading devices such as servo motors, servo electric cylinders, and servo hydraulic cylinders.

[0036] The bearing plate 2 has no protrusions on its surface 21. The surface 21 is directly connected to the force loading device 1 through a sliding or rolling structure.

[0037] Optionally, the sliding or rolling structure can be a low-friction material contact pair, balls, or rollers. Furthermore, bearings capable of withstanding axial forces, such as... Figure 6 .

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A test apparatus capable of loading cyclic bending moment loads, characterized in that, It includes a force loading device, a load-bearing plate, and an output shaft. The force loading device includes an energy storage element, a force contact structure, and a pressure plate bracket. The load-bearing plate has a disc-shaped structure with a gap between its surface and the pressure plate bracket, which is slightly larger than the height of the pressure plate bracket protrusion at the head of the force contact structure. The load-bearing plate also has several smaller protrusions along its circumference, the height of which is also slightly smaller than the gap between the load-bearing plate surface and the pressure plate bracket.

2. According to claim 1, the force loading device can be an active servo force application device such as a servo motor, servo electric cylinder, or servo hydraulic cylinder. In this case, there are no protrusions on the force-bearing plate surface. The plate surface is directly connected to the force contact structure of the force loading device through a sliding or rolling structure. Optionally, the sliding or rolling structure can be a low-friction material contact pair, balls, or rollers. Further, a bearing capable of withstanding axial forces can be selected.

3. According to claim 1, the energy storage element can be various elastic elements such as springs. More preferably, hydraulic cylinders, pneumatic cylinders, electric cylinders, rubber elastomers, airbags, etc., can be selected.

4. According to claim 1, the contact friction portion of the force contact structure can be a sliding friction structure or a rolling friction structure. Optionally, the force contact structure can be a protrusion, ball bearing, roller, etc., made of a low-friction material.

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