阅读说明：本技术 一种悬臂梁传感器 (Cantilever beam sensor ) 是由 朱道政 朱继海 于 2019-09-21 设计创作，主要内容包括：本发明公开了一种悬臂梁传感器,包括弹性体、设于弹性体内的应变计以及设在弹性体外侧用于引出导线的接头,弹性体为一体式悬臂梁结构,悬臂梁设计要求其中,P：拉应力,C：压应力,以下四种结构的目的：把大小为1P的力向上传递1B的长度,T+C即为结构的效率。本发明设计的悬臂梁结构去除了一些基本没有承受力的分量的筋,进而起到减重的效果,并且在受力集中的地方添加加强筋,以达到改善结构受力的目的,可明显改善模型结构应力集中现象。(The invention discloses a cantilever beam sensor, which comprises an elastic body, a strain gauge arranged in the elastic body and a joint arranged outside the elastic body and used for leading out a lead, wherein the elastic body is of an integrated cantilever beam structure, and the design requirement of a cantilever beam is as follows, wherein, P: tensile stress, C: compressive stress, the purpose of the following four structures: the force of 1P is transmitted upwards by the length of 1B, and T + C is the efficiency of the structure. The cantilever beam structure designed by the invention removes some ribs which basically have no component of bearing force, thereby playing a role of reducing weight, and adds the reinforcing ribs at the positions with concentrated stress to achieve the purpose of improving the stress of the structure, and can obviously improve the stress concentration phenomenon of the model structure.)

1. The cantilever beam sensor is characterized in that the scheme is as follows:

the cantilever beam structure is designed according to the requirements of P tensile stress and C compressive stress, the purpose of the four structures is that the force with the size of 1P is transmitted upwards by the length of 1B, and T + C is the efficiency of the structure, the cantilever beam structure is assumed that a model is preliminarily designed through the four cantilever beam frame structures introduced in the front, the purpose is to ensure the high efficiency of a force transmission path and realize the optimization of the bearing capacity, the structural optimization can be carried out by combining a simulation result on the basis of the model, when the stress of the cantilever beam structure is simulated, an Abaqus software is selected to carry out structural stress and deformation analysis, the material properties and the calculation method in the input software are that the density of ① material is 1.16g/cm3, the Young modulus is 2650MPa, the Poisson ratio is 0.41, the section type of ② is solid and homogeneous, the analysis step type of ③ analysis step is static force and general, the maximum increment step number is 500, the load type of ④ pressure, the loading part is 30mm multiplied by 30mm, the boundary region is completely fixed, the boundary region is ⑤, the upper and the size of an Abaqard unit is approximate to the size of an Abaqard unit, and the size of the approximate size of an Abaqard unit is calculated.

Technical Field

The invention relates to a cantilever beam sensor.

Background

At present, cantilever beam sensors are widely applied to various electronic weighing devices such as various material tank scales, platform scales and the like. A cantilever sensor generally includes a cantilever elastomer, and a strain gauge disposed on the elastomer. Chinese utility model patent "cantilever beam formula weighing sensor" as patent number CN200620100695.1 contains the elastomer, is equipped with strain hole in the elastomer, and strain gage, its characterized in that are pasted to the strain zone surface of elastomer: the arrangement positions of the strain holes are asymmetrical to the thicknesses of the upper wall and the lower wall of the elastic body; a stress blocking groove is formed between the bottom plane of the lower strain area of the elastic body and the bottom plane of the fixed end, the stress blocking groove is arranged at 90 degrees to the axial length direction, and a fixing screw hole fixed with the base and a connecting screw hole fixed with the weighing body are formed in the elastic body. In the actual use process, the cantilever beam structure often needs to bear the effects of various concentrated loads, distributed loads, bending moments and torques, and any part of the beam can generate larger stress and deformation, so that the cantilever beam structure is damaged or fails. It is important to cantilever beam structures how to maximize beam load bearing capacity.

Disclosure of Invention

In order to solve the problems, the scheme of the invention is as follows:

the cantilever beam structure is designed according to the requirements of P tensile stress and C compressive stress, the purpose of the four structures is that the force with the size of 1P is transmitted upwards by the length of 1B, and T + C is the efficiency of the structure, the cantilever beam structure is assumed that a model is preliminarily designed through the four cantilever beam frame structures introduced in the front, the purpose is to ensure the high efficiency of a force transmission path and realize the optimization of the bearing capacity, the structural optimization can be carried out by combining a simulation result on the basis of the model, when the stress of the cantilever beam structure is simulated, an Abaqus software is selected to carry out structural stress and deformation analysis, the material properties and the calculation method in the input software are that the density of ① material is 1.16g/cm3, the Young modulus is 2650MPa, the Poisson ratio is 0.41, the section type of ② is solid and homogeneous, the analysis step type of ③ analysis step is static force and general, the maximum increment step number is 500, the load type of ④ pressure, the loading part is 30mm multiplied by 30mm, the boundary region is completely fixed, the boundary region is ⑤, the upper and the size of an Abaqard unit is approximate to the size of an Abaqard unit, and the size of the approximate size of an Abaqard unit is calculated.

Has the advantages that: the cantilever beam structure designed by the invention removes some ribs which basically have no component of bearing force, thereby playing a role of reducing weight, and adds the reinforcing ribs at the positions with concentrated stress to achieve the purpose of improving the stress of the structure, and can obviously improve the stress concentration phenomenon of the model structure. Meanwhile, experiments show that the effect of improving the stress of the structure is best when the reinforcing rib passes through the middle point of the first bearing rib, the middle point of the second bearing rib and the middle point of the third bearing rib, and the stress concentration phenomenon of the model structure can be better improved.

Detailed Description

The present invention is further illustrated below with reference to specific examples, which will assist the person skilled in the art to further understand the invention, but which are not intended to limit the invention in any way.

Including the elastomer, locate the strainometer in the elastomer and establish the joint that is used for drawing forth the wire in the elastomer outside, elastomer formula cantilever beam structure as an organic whole, cantilever beam design requirement: design a cantilever beam of configuration optimization, make bearing capacity maximize as far as possible, fully consider the transmission path of material utilization and power, guarantee that the transmission path of power is high-efficient, avoid power to go "make unnecessary the way", make same starting point, same destination, the journey is shorter under the same circumstances of displacement in the transmission process. For force flow, the path is the magnitude of the force multiplied by the length of the force flow. This measure is true for gravity loads, and for side loads. The following are comparisons of the four structures, where P: tensile stress, C: compressive stress. The purpose of the following four structures: the length of 1B is transmitted upwards to the force with the size of 1P, T + C is the efficiency of the structure, and the last structure can be seen, and the cantilever beam structure is assumed: the model is preliminarily designed through the four cantilever beam frame structures introduced in the front, so that the transmission path of the force is high in efficiency, and the bearing capacity is optimized. And structural optimization can be carried out by combining simulation results on the basis of the model.

When the stress action of a cantilever beam structure is simulated, an Abaqus software is selected to analyze the structure stress and deformation, the material properties and the calculation method input into the software are that ① material density is 1.16g/cm3, Young modulus is 2650MPa, Poisson ratio is 0.41, ② section types are solid and homogeneous, ③ analysis step types are static and universal, maximum increment step number is 500, ④ load types are pressure and a loading position is 30mm multiplied by 30mm reserved area, ⑤ boundary condition types are upper and lower end faces which are completely fixed and attached to a tool, ⑥ division grids are adopted, the unit shape is a tetrahedron, the approximate global size is 2, and ⑦ analysis program is Abaqus/Standard.

Under the same load, the three ribs on the top of the cantilever beam flat plate basically have no component of bearing force and can be removed; the three ribs close to the left side are obviously stressed, and reinforcing ribs need to be further added to ensure the integral strength of the cantilever beam. Three top ribs can be removed to play a role in reducing weight, and the phenomenon of stress concentration of the model structure can be obviously improved by adding the reinforcing ribs at the places where stress is concentrated.

In the simulation process, the load is 0.2MPa, is uniformly distributed at the position of 30mm multiplied by 30mm in the front section area, and model optimization is carried out by adjusting the position of the rib indicated by the arrow. From two sets of simulation results, it can be seen that: stress concentration parts are basically the same, but stress components at local integral points have certain difference, loads are uniformly distributed at the positions of 30mm multiplied by 30mm in the front section area by adopting 0.2MPa, and model optimization is carried out by adjusting the characteristics indicated by arrows. From three sets of simulation results it can be seen that: the single edge of each rib indicated by the arrow is thickened by 0.5 mm, although the stress component of each rib is relieved, the stress concentration of the left side part of the top of the plane is obvious, the local stress value is large, and great loss is caused to the strength of the whole structure; the structure is finely adjusted, and the stress is found to be concentrated on the right front section, and the stress distribution trend can have adverse effect on the whole bearing capacity of the structure. The load is 0.2MPa, the load is uniformly distributed at the position of 30mm multiplied by 30mm in the front section area, and model optimization is carried out by adjusting local characteristics.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or modifications, and equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.