CN2835961Y

CN2835961Y - Square column type sensor without blind pore

Info

Publication number: CN2835961Y
Application number: CN 200520064224
Authority: CN
Inventors: 涂志成
Original assignee: GUANGZHOU ELECTRICAL MEASURING INSTRUMENTS FACTORY
Current assignee: GUANGZHOU ELECTRICAL MEASURING INSTRUMENTS FACTORY
Priority date: 2005-09-12
Filing date: 2005-09-12
Publication date: 2006-11-08
Anticipated expiration: 2015-09-12

Abstract

The utility model relates to a resistance strain type sensor, particularly a square column type sensor. The utility model is characterized in that the square column type sensor mainly comprises an elastic body, wherein the shape of the elastic body is a cylinder shape, but a testing beam of the middle part is rectangular, a load bearing end is a cambered concave surface, a supporting end is a circumferential plane surface, and mounting holes are distributed on the plane surface; the testing beam is a rectangular and homogeneous square column beam without a blind hole (groove), the four surfaces of the testing beam are all distributed with resistance strain gauges, and the number of the resistance strain gauges can be four or eight; the load bearing end is a cambered concave surface, and a steel ball force-transfer structure is adopted. Since the utility model adopts the square column type and the steel ball force-transfer structure, the utility model has the advantages of small size, light weight, automatic replacement, high measuring precision, simple processing technology, strong capacity of deflection loading resistance, etc.

Description

No blind hole square column formula sensor

Technical field:

The utility model relates to a kind of resistance strain type sensor, especially a kind of no blind hole square column formula sensor.

Background technology:

Traditional column type sensor mainly contains two types: a class testing beam is a column type, and another kind of test beam is the square column type; The cylindrical structure strainometer is installed in periphery along the circumference equal portions, and the processing of column type product is simple, and the anti-bias load ability is relatively poor, and precision is lower, must add compensating circuit (using semiconductor strain gauge usually) accurate adjustment one by one, could obtain desirable linearity; Another type test beam is the square column type, the middle part of square column type symmetry be provided with blind groove of square or round blind hole, strainometer is installed in blind groove or blind hole bottom surface.Compare the column type structure, the square column structure precision is much improved, the anti-bias load ability drop.Owing to increased blind hole (groove), difficulty of processing is big.

Summary of the invention:

The purpose of this utility model provides a kind of high-precision, existing good anti-bias load ability, automatically resets, and is easy to no blind hole (groove) the square column formula sensor of batch machining again.

The technical scheme that its technical matters that solves the utility model adopts is: compare with cylindrical structural, the utility model has adopted the steel ball carrying, and automatic aligning resets, and square column test beam is more even, symmetrical.Paster zone stress ratio is more concentrated, so need not to increase in addition compensating circuit, just can obtain higher measuring accuracy.The strainometer of the square column formula sensor of existing blind hole (groove) is attached on the bottom thin-walled of blind hole (groove), if add man-hour, can not guarantee thin-walled just on elastomeric center line, and measuring accuracy does not just have collateral security yet so.Compare the square column formula structure that is provided with blind hole (groove), the angle of test rectangle beam of the present utility model and two ends point of attachment is the R fillet, described test Liang Weiyi rectangular configuration symmetrically, and non-linear less, the anti-bias load ability improves greatly.Good manufacturability is easy to batch machining.Sum up above statement, the utility model is characterised in that: comprise that mainly profile is cylindrical, middle part test beam is the elastic body of rectangle, and the bearing end is an arc-shaped concave, and support end is a circumferential plane, is distributed with mounting hole in the plane; The test beam be rectangle and evenly do not have blind hole (groove) square column beam the test beam four faces be evenly equipped with strain ga(u)ge, strain ga(u)ge can be that sheet also can be a sheet; The bearing end is an arc-shaped concave, adopts the steel ball force transferring structure.

Square column formula force transducer of the present utility model, especially a kind of square column beam type LOAD CELLS that is applicable to the high-precision electronic weighing apparatus.It is mainly used in: track scale, electronic vehicle weighing apparatus.

The beneficial effects of the utility model are:

1), compact conformation, volume be little, highly low, can be fit to the lower weighing apparatus adapted of various shape requirements, suitability is strong.

2), adopt the test rectangle beam, non-linear little, need not to increase linear compensation circuit and also can obtain higher measuring accuracy.

3), the steel ball power transmission, easy for installation, stability is high, the anti-bias load ability is strong;

Description of drawings:

Below with reference to accompanying drawing the utility model is described further;

Fig. 1 is a vertical view of the present utility model;

Fig. 2 is that figure cuts open in the office of facing of the present utility model;

Specific embodiment:

In order to describe the utility model in detail, be that example describes with a kind of form wherein here.

Compare with cylindrical structural, the utility model has adopted the steel ball carrying, and automatic aligning resets, and square column test beam is more even, symmetrical.Paster zone stress ratio is more concentrated, so need not to increase in addition compensating circuit, just can obtain higher measuring accuracy.The strainometer of the square column formula sensor of existing blind hole (groove) is attached on the bottom thin-walled of blind hole (groove), if add man-hour, can not guarantee thin-walled just on elastomeric center line, and measuring accuracy does not just have collateral security yet so.Compare the square column formula structure that is provided with blind hole (groove), the angle of test rectangle beam of the present utility model and two ends point of attachment is the R fillet, described test Liang Weiyi rectangular configuration symmetrically, and non-linear less, the anti-bias load ability improves greatly.Good manufacturability is easy to batch machining.Sum up above statement, the utility model is characterised in that: comprise that mainly profile is cylindrical, middle part test beam is the elastic body of rectangle, and the bearing end is an arc-shaped concave, and support end is a circumferential plane, is distributed with mounting hole in the plane; The test beam be rectangle and evenly do not have blind hole (groove) square column beam the test beam four faces be evenly equipped with strain ga(u)ge, strain ga(u)ge can be that sheet also can be a sheet; The bearing end is an arc-shaped concave, adopts the steel ball force transferring structure.

As shown in Figure 1: the utility model comprises that profile is cylindrical, and middle part test beam is the elastic body 1 of rectangle, and respectively there is a force side at described elastic body two ends, the bearing end is an arcwall face 2, be used to hold steel ball 6, support end is a circumferential plane 3, is distributed with mounting hole in the plane.The test beam 4 that described elastomeric centre is a rectangle, the angle at described test beam and two ends is the R fillet, four faces of described test beam are evenly equipped with strain ga(u)ge 5, strain ga(u)ge adheres to four brachium pontis separately, constitutes a Wheatstone bridge, if DC voltage one 5 ~ 15 volts of the excitation end of electric bridge inputs, then signal end will be exported the d. c. voltage signal of a millivolt level, is called the uneven output at zero point of Wheatstone bridge.On carrying steel ball 6, square column type test beam produces deformation, is installed in the STRESS VARIATION that the strainometer on its beam bears different directions as certain action of gravity, and the strain of induction different directions.Stress by Heraeus, substrate glue, pass to the sensitive grid of strainometer, 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 electric bridge initial balance is destroyed, if supply with one 5 ~ 15 volts DC voltage at the excitation end, according to the Hui Sideng principle, signal end will produce the voltage signal of a millivolt level, and the size of this signal is directly proportional with acting force on being carried in sensor.

Claims

1, a kind of no blind hole square column formula sensor, it is characterized in that: profile is cylindrical, and middle part test beam is the elastic body (1) of rectangle, and the bearing end is an arc-shaped concave (2), and support end is a circumferential plane (3), is distributed with mounting hole in the plane.

2, no blind hole square column formula sensor according to claim 1 is characterized in that: test beam (4) is for rectangle and evenly do not have blind hole groove square column beam, is evenly equipped with strain ga(u)ge (5) at four faces testing beam, and strain ga(u)ge can be 4 also can be 8.

3, no blind hole square column formula sensor according to claim 1, it is characterized in that: the bearing end is an arc-shaped concave (2), adopts the steel ball force transferring structure.