CN2643295Y

CN2643295Y - Thin plate type weighing sensor

Info

Publication number: CN2643295Y
Application number: CN 03267963
Authority: CN
Inventors: 涂志成
Original assignee: GUANGZHOU ELECTRICAL MEASURING INSTRUMENTS FACTORY
Current assignee: GUANGZHOU ELECTRICAL MEASURING INSTRUMENTS FACTORY
Priority date: 2003-07-25
Filing date: 2003-07-25
Publication date: 2004-09-22
Anticipated expiration: 2013-07-25

Abstract

The utility model provides a flat-plate weighting sensor. An I-shaped hollowed-out portion is arranged in the middle of a metal flat plate. The left and right sides of the hollowed-out portion are respectively formed into a supporting portion and a bearing portion. A plurality of through holes are arranged on the supporting portion and a plurality of screw holes are arranged on the bearing portion. The upper and lower portions of the hollowed-out portion are connected with the supporting portion and the bearing portion, and formed into double non-uniform symmetrical parallel beams. The strained parallel beams are provided with a resistance stain gauge at a stees-concentrated location. The resistance strain meter is structured into a Wheatstone bridge according to a corresponding relation. The utility model has the advantages of a compact structure, a small volume, a lower height, double parallel beams, a ultra bearing capability and a 4-angle balance correction, which can be used in making a ultra-thin balance.

Description

Slim board-like LOAD CELLS

Technical field

The utility model relates to a kind of LOAD CELLS, refers in particular to a kind of slim board-like LOAD CELLS.

Background technology

Along with the arrival of information age, the development tendency of industrial products is in intelligent, lighting; Weighing apparatus is as the instrument of exchange of class trade flows, and its combination property is subjected to the extensive concern of various circles of society naturally.And how the core parts sensor of weighing apparatus can accomplish just that profile is low, volume is little, accuracy is high, light, will be the key that realizes the intelligent and lighting of weighing apparatus.At present, the miniature LOAD CELLS of domestic use mainly is one or more pairs of upper and lower distribution parallel girder structures, because structural limitations, the complete machine height is unfavorable for realizing ultrathin design, can't satisfy the needs that some special occasions detect, its anti-bias load, anti-impact force and overload capacity are all undesirable; And be not easy to carry, accuracy of detection does not reach requirement yet.

Summary of the invention

At the deficiencies in the prior art, the purpose of this utility model is to provide a kind of slim board-like LOAD CELLS that a kind of volume is little, highly low, accuracy of detection is high.

The purpose of this utility model is to be achieved by following technical scheme: a kind of slim board-like LOAD CELLS, comprise sheet metal, strain ga(u)ge, be provided with " worker " font hollow-out parts at the sheet metal middle part, the left and right both sides of hollow-out parts form support portion and supporting part respectively; On the support portion, be provided with a plurality of through holes, be provided with a plurality of screws at supporting part; The upper and lower part of hollow-out parts connects support portion and supporting part, and forms a pair of non-homogeneous, symmetrical two parallel girders; The symmetrical respectively stress raiser that is installed in parallel girder of described strain ga(u)ge, strain ga(u)ge is pressed corresponding relation and is constituted Wheatstone bridge.

On the basis of adopting abovementioned technology, further improving is that support portion, supporting part and parallel girder two are in the same plane, and the support portion is provided with a plurality of through holes, and supporting part is provided with a plurality of screws.

Sensor of the present utility model has compact conformation, little, highly low, the two parallel girder of volume, strong, the four jiaos of amendable characteristics of balance of overload capacity.

Description of drawings

Fig. 1 is wherein a kind of structural representation of specific embodiment of the utility model;

Fig. 2 is circuit theory diagrams of the present utility model;

Fig. 3 is an assembling synoptic diagram of the present utility model.

Among the figure: 2 through holes, 21 supporting parts, 3 screws, 31 parallel girders, 4 carriers, the 5 strain ga(u)ge A strain ga(u)ge B strain ga(u)ge C strain ga(u)ge D input end E output terminal F of hollow-out parts 1 support portion

Embodiment

Below in conjunction with accompanying drawing the utility model is done to describe further.

As shown in Figure 1, slim board-like LOAD CELLS of the present utility model comprises sheet metal, four strain ga(u)ge A, B, C, D, is provided with " worker " font hollow-out parts 1 at the sheet metal middle part, and the left and right both sides of hollow-out parts 1 form support portion 2 and supporting part 3 respectively; On support portion 2, be provided with three and be the through hole 21 that equilateral triangle distributes, be provided with three at supporting part 3 and be the screw 31 that equilateral triangle distributes; The upper and lower part of hollow-out parts 1 connects support portion 2 and supporting part 3, and forms a pair of non-homogeneous, symmetrical two parallel girders 4; The symmetrical respectively stress raiser that is installed in parallel girder of strain ga(u)ge A, B, C, D, strain ga(u)ge A, B, C, D press corresponding relation and constitute Wheatstone bridge.

Circuit theory of the present utility model sees also shown in Figure 2, strain ga(u)ge A, B, C, D adhere to four brachium pontis separately, constitute a Wheatstone bridge, if DC voltage one 3～15 volts of the input end E of electric bridge inputs, then the output terminal F of electric bridge will export the d. c. voltage signal of a millivolt level, is called the uneven output at zero point of Wheatstone bridge.

User mode of the present utility model as shown in Figure 3, support portion 2 is fixed on the carrier 5, supporting part 3 is unsettled, when giving input end E power supply, output terminal F is output at zero point; During at supporting part 3, a pair of non-homogeneous but symmetrical parallel girder 4 produces distortion, is installed in the STRESS VARIATION that strain ga(u)ge A, B, C, D on the parallel girder 4 bear different directions, and the strain of different directions takes place as certain action of gravity; Stress by Heraeus, substrate glue, pass to sensitive grid; Under external force, strain ga(u)ge A, C bear pulling force, and sensitive grid is stretched, and resistance increases; Strain ga(u)ge B, D bear pressure, and sensitive grid is compressed, and resistance reduces; Because the impression of the strain ga(u)ge of electric bridge is the power of different directions, what produce is the strain of different directions, therefore the initial balance of electric bridge is destroyed, if DC voltage one 3～15 volts of input end supplies, according to the Hui Sideng principle, output terminal F will export the voltage signal of a millivolt level, and the size of this signal is directly proportional with acting force on being carried in slim board-like sensor.

Claims

1. a slim board-like LOAD CELLS comprises sheet metal, strain ga(u)ge, it is characterized in that: be provided with " worker " font hollow-out parts (1) at the sheet metal middle part, the left and right both sides of hollow-out parts (1) form support portion (2) and supporting part (3) respectively; On support portion (2), be provided with a plurality of through holes (21), be provided with a plurality of screws (31) at supporting part (3); The upper and lower part of hollow-out parts (1) connects support portion (2) and supporting part (3), and forms a pair of non-homogeneous, symmetrical two parallel girders (4); The symmetrical respectively stress raiser that is installed in parallel girder of described strain ga(u)ge, strain ga(u)ge is pressed corresponding relation and is constituted Wheatstone bridge.

2. sensor according to claim 1 is characterized in that: support portion (2), supporting part (3) and parallel girder (4) are in the same plane.