CN113029558B

CN113029558B - Adjustable grouping radial load spring applying device

Info

Publication number: CN113029558B
Application number: CN202110248265.3A
Authority: CN
Inventors: 王世宇; 王久霞; 刘晨; 夏春花; 王一凡; 魏振航
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2021-03-07
Filing date: 2021-03-07
Publication date: 2022-07-01
Anticipated expiration: 2041-03-07
Also published as: CN113029558A

Abstract

The invention discloses an adjustable grouping radial load spring applying device which comprises a supporting mechanism and a force applying mechanism, wherein the supporting mechanism comprises a fixed block, a disc and a supporting shaft; the number of the stress applying mechanisms is consistent with that of the fixed blocks; the supporting shaft is used for being fixed on a base of the vibration measuring equipment through self threads, a flat key groove is formed in the supporting shaft, and a disc is circumferentially fixed on the supporting shaft through a flat key and the flat key groove; the disc is provided with a groove, and the fixed block is provided with a lug matched with the groove; the upper portion of fixed block is passed through the connecting hole and is connected with the stay tube, all is equipped with a set of lock nut on every stay tube and is used for the fastening, has cup jointed the spring on every stay tube, and every spring end all is provided with little quality piece, is provided with the ring on the axis horizontal plane of stay tube, and the ring pastes tight setting with every little quality piece, and the spring on the stay tube is firm in order to realize the ring through applying external force to the ring under the prerequisite that does not increase the support.

Description

Adjustable grouping radial load spring applying device

Technical Field

The invention belongs to the field of mechanical vibration and relates to the natural frequency direction of a system, in particular to an adjustable grouping radial load spring applying device.

Background

The planetary gear transmission has the advantages of compact structure, balanced stress, high transmission efficiency, strong bearing capacity and the like, and is a transmission form with wide application.

The document (Z.Chen, Y.Shao, Mesh stiffness of an internal spray pair with ring gear rim formation. J Mechanism and Machine Theory,2013,69(2013):1-12) studies the gear Mesh stiffness of the ring structure based on the uniformly distributed Ferro-Ciscomb Theory. Studies have shown that elastic deformation of the ring structure does couple into the gear mesh stiffness of the internal gear pair, i.e. elastic deformation affects the mesh stiffness.

The literature (T.M.Ericson, R.G.Parker, Experimental measurement of the effects of torque on the dynamic devices and system parameters of the planar devices, M mechanisms and Machine tools, 2014,74(2014): 370) has studied the effect of operating torque on system modal parameters and dynamic response experimentally. The results show that the modal parameters such as the natural frequency of the system are indeed affected by the external load.

It is worth mentioning that the previous calculation of the meshing stiffness of the planet gears is mostly based on the assumption that the ring gear is rigidly deformed. In fact, according to recent research in laboratories, modal parameters such as the natural frequency of the system are not invariable. The gear ring is taken as an example for explanation, and because the gear ring is an elastic body, an external load acts on the gear ring, on one hand, the gear ring is subjected to static deformation, and then the meshing rigidity is changed; on the other hand, the external load plays a role of the bending rigidity of the gear ring, so that the overall bending rigidity of the system is increased; the final result is that the total stiffness of the system changes, and further the mode parameters such as the natural frequency of the system also change correspondingly.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides an adjustable grouping radial load spring applying device aiming at the problem that an external load affects the modal parameters such as the natural frequency of a system.

The purpose of the invention is realized by the following technical scheme:

an adjustable grouping radial load spring applying device comprises a supporting mechanism and a force applying mechanism, wherein the supporting mechanism comprises a fixed block, a disc and a supporting shaft, and the force applying mechanism comprises a supporting pipe, a spring and a small mass block; the number of the stress applying mechanisms is consistent with that of the fixed blocks; the supporting shaft is used for being fixed on a base of vibration measuring equipment through threads, a flat key groove is formed in the supporting shaft, the disc is circumferentially fixed on the supporting shaft through a flat key and the flat key groove, and the disc is axially fixed on the supporting shaft through a locking nut and a gasket; the disc is provided with a groove, the fixed block is provided with a lug matched with the groove, the disc and the fixed block are connected with each other through the lug and the groove, the upper part and the lower part of the fixed block and the disc are provided with connecting holes, and the disc and the lower part of the fixed block are fastened through bolts, locking nuts and gaskets; the upper portion of fixed block pass through the connecting hole with the stay tube is connected, all is equipped with a set of lock nut on every stay tube and is used for the fastening, every cup joint on the stay tube the spring, every spring end all is provided with little quality piece, be provided with the ring on the axis horizontal plane of stay tube, just the ring pastes tight setting with every little quality piece, and the spring on the stay tube is through exerting external force in order to realize that the ring is firm under the prerequisite that does not increase the support to the ring.

Furthermore, the disc is connected with six fixed blocks, and the six fixed blocks are respectively distributed in the directions of 0 degree, 60 degrees, 120 degrees, 180 degrees, 240 degrees and 300 degrees of the disc.

Further, the minimum distance between the end of the supporting tube and the circular ring is larger than the height of the small mass block.

Furthermore, a thin nut is movably connected to the supporting tube and used for changing the supporting force of the spring on the circular ring.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects:

1. the invention applies external load to the annular structure, and simultaneously does not add any support to the annular structure, thereby achieving the purpose of taking the external load as the only research variable;

2. the device can apply a plurality of external loads for an annular structure mainly through the matching of the disc and the fixed blocks, and just so, the number of the fixed blocks can be increased or reduced as required, and the position of each fixed block can also be moved as required, so the device has adjustability to a great extent, and further the distribution modes of the external loads can be diversified, for example, the total twelve external loads can be divided into the following four modes, for example, each group of six forces of two groups of external loads, each group of two forces of six groups of external loads, twelve external loads uniformly distributed and twelve external loads unevenly distributed.

3. The device has the characteristics of universality, accuracy, flexibility and the like. According to the device, the influence of the external load on the modal parameters such as the natural frequency of the system can be studied, for example, the influence of the external load on the natural frequency of the system, the influence of the external load on the damping ratio of the system, the influence of the external load on the vibration mode of the system and the like.

Drawings

FIG. 1 is a schematic perspective view of an adjustable grouped radial load spring applicator according to the present invention;

FIG. 2 is a front view of the adjustable grouped radial load spring applicator shown in FIG. 1;

FIG. 3 is a right side view of the adjustable grouped radial load spring applicator shown in FIG. 1;

fig. 4a and 4b are schematic structural views of a fixing block; fig. 4C to 4e are schematic sectional views in directions a-A, B-B and C-C in fig. 4a and 4B, respectively.

Reference numerals: 1-small mass block; 2-a spring; 3-a thin nut; 4-a gasket I; 5-locking the nut I; 6, fixing blocks; 7-a circular ring; 8-a disc; 9-supporting the shaft; 10-common flat bond; 11-a bolt; 12-locking nut II; 13-spacer II; 14-shim iii; 15-locking nut III; 16-support tube.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 to 4e, the present invention is an adjustable grouped radial load spring applying device, which is realized by the following technical scheme, including a supporting mechanism and an urging mechanism. The method specifically comprises the following steps: the device comprises a small mass block 1, a spring 2, a thin nut 3, a gasket I4, a locking nut I5, a fixing block 6, a circular ring 7, a circular disc 8, a supporting shaft 9, a flat key 10, a bolt 11, a locking nut II 12, a gasket II 3, a gasket III 14, a locking nut III 15 and a supporting pipe 16.

The supporting mechanism comprises six fixed blocks 6 which are uniformly distributed along the same circumferential direction, the chassis of the six fixed blocks 6 is a disc 8, the shape of the fixed blocks is approximately of a T-shaped structure in the embodiment, and the fixed blocks 6 can slide along the circumferential direction of the grooves on the disc 8 by virtue of the bumps on the fixed blocks 6, so that the positioning effect is realized; and then the fixing block 6 is respectively fastened on the disc 8 through a bolt 11, a locking nut II 12 and a gasket II 13 in a bolt connection manner, so that the locking effect is realized. The disc 8 is supported by a support shaft 9, the disc 8 is axially positioned through a shaft neck, a locking nut III 15 and a gasket III 14, and then the disc 8 is circumferentially positioned through a common flat key 10; meanwhile, the supporting shaft 9 can be connected with a fixing device in a laboratory so as to facilitate the operations of vibration excitation, tightening and the like in the later period.

The force applying mechanism supports the remaining components primarily by the support tube 16. Each supporting tube 16 is distributed with a spring, and the supporting tube 16 is used as the support of the spring 2; furthermore, a thin nut 3 is distributed on each support tube 16 for compressing the spring 2 to provide an external load to the ring 7. In order to overcome the difficulty that the end of the spring 2 is difficult to support the inner side of the ring directly, a small mass 1 is arranged between the ring 7 and the spring 2. The outer side surface of the small mass block 1 is made into a round shape, so that the small mass block can be perfectly matched with the ring 7.

Specifically, the device comprises a supporting mechanism and six force applying mechanisms which are uniformly distributed along the circumferential direction of the supporting mechanism. The whole device is connected by six fixed blocks 6 in the supporting mechanism and six supporting tubes 16 in six stress applying mechanisms. For this purpose, the supporting tubes 16 are all made into solid full-thread type tubes, and on the premise that the minimum distance between the tail ends of the supporting tubes 16 and the circular ring 7 is larger than the height of the small mass block 1, and the maximum distance is not to enable the front ends of the supporting tubes to interfere with each other, the supporting tubes are respectively screwed on the corresponding fixing blocks 6 through threads by two groups of gaskets I4 and locking nuts I5. The fastening block 6 is fastened on the one hand to the ring 7 and on the other hand serves as a support for the support tube 16.

In the assembling process, firstly, a supporting shaft 9 is fixed on a base of the vibration measuring equipment through a locking nut and a gasket by threads; then, a common flat key 10 is arranged in a flat key groove of a support shaft 9, a disc 8 is fixed along the circumferential direction of the common flat key 10, and the disc 8 is fastened on the support shaft 9 through a locking nut III 15 and a gasket III 14; then, the six fixing blocks 6 are respectively arranged on the scales of 0 degree, 60 degrees, 120 degrees, 180 degrees, 240 degrees and 300 degrees on the disc 8 through the convex blocks on the fixing blocks 6 and the grooves on the disc 8, and the six fixing blocks 6 are respectively tightly fixed on the disc 8 through six bolts 11, six locking nuts II 12 and six gaskets II 13; then, fixing each supporting tube 16 on each fixing block 6 by using two groups of locking nuts I5 and gaskets I4 respectively, wherein in the step, the minimum distance between the tail end of each supporting tube 16 and the ring 7 is larger than the height of the small mass block 1, the maximum distance is also required to ensure that the front ends of the supporting tubes do not interfere with each other, and six groups are required to be completely consistent; six thin nuts 3 are sleeved on six support pipes 16 along threads respectively; six springs 2 are respectively sleeved on six supporting tubes 16; respectively sleeving six small mass blocks 1 on the tail ends of six springs 2; the circular ring 7 is placed on the horizontal plane of the axes of the six support pipes 16, the six small mass blocks are tightly attached, then the six thin nuts 3 are screwed in sequence until the circular ring can be completely supported, and finally the screwing distances of the six thin nuts 3 are completely consistent, namely the six external loads along the circumferential direction are completely equal in numerical value.

In conclusion, the invention designs an adjustable grouping radial load spring applying device aiming at the problem that the external load affects the modal parameters such as the natural frequency of the system. The method is characterized in that no support is added while external load is applied to the annular structure, the arrangement mode of the external load can be diversified, and the external load is used as a unique variable, so that the influence of the external load on modal parameters such as the natural frequency of the system can be studied in an experimental mode.

In the embodiment of the present invention, except for the specific description of the model of each device, the model of other devices is not limited as long as the device can perform the above functions.

Those skilled in the art will appreciate that the drawings are only schematic illustrations of preferred embodiments, and the above-described embodiments of the present invention are merely provided for description and do not represent the merits of the embodiments.

The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The adjustable grouping radial load spring applying device is characterized by comprising a supporting mechanism and a force applying mechanism, wherein the supporting mechanism comprises a fixed block, a disc and a supporting shaft, and the force applying mechanism comprises a supporting pipe, a spring and a small mass block; the number of the stress applying mechanisms is consistent with that of the fixed blocks; the supporting shaft is used for being fixed on a base of vibration measuring equipment through threads, a flat key groove is formed in the supporting shaft, the disc is circumferentially fixed on the supporting shaft through a flat key and the flat key groove, and the disc is axially fixed on the supporting shaft through a locking nut and a gasket; the disc is provided with a groove, the fixed block is provided with a lug matched with the groove, the disc and the fixed block are connected with each other through the lug and the groove, the upper part and the lower part of the fixed block and the disc are provided with connecting holes, and the disc and the lower part of the fixed block are fastened through bolts, locking nuts and gaskets; the upper portion of fixed block pass through the connecting hole with the stay tube is connected, all is equipped with a set of lock nut on every stay tube and is used for the fastening, every cup joint on the stay tube the spring, every spring end all is provided with little quality piece, be provided with the ring on the axis horizontal plane of stay tube, just the ring pastes tight setting with every little quality piece, and the spring on the stay tube is through exerting external force in order to realize that the ring is firm under the prerequisite that does not increase the support to the ring.

2. The adjustable grouped radial load spring applying device according to claim 1, wherein the disc is connected with six fixed blocks, and the six fixed blocks are respectively distributed in the directions of 0 °, 60 °, 120 °, 180 °, 240 ° and 300 ° of the disc.

3. The adjustable grouped radial load spring applicator of claim 1 wherein the minimum distance between the ends of the support tubes and the ring is greater than the height of the small mass.

4. The adjustable grouping radial load spring applying apparatus according to claim 1, wherein a thin nut is further movably connected to the support tube for varying the support force of the spring to the ring.