CN2061276U

CN2061276U - Portable electronic steelyard

Info

Publication number: CN2061276U
Application number: CN 90201209
Authority: CN
Inventors: 姜天侠
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-01-31
Filing date: 1990-01-31
Publication date: 1990-08-29

Abstract

The utility model belongs to the electric measurement technical field, and relates to a portable electronic steelyard which can effectively replace portable commercial mechanical lever steelyards and civil spring steelyards. A button type cell is adopted by the portable electronic steelyard to be used as a power supply, and a resistive strain gauge transducer is chosen; an elastic element 2 adopts the thin wall and handing ring shape; a measurement display instrument and other electric apparatus components are totally mounted in the interior of the hanging ring; a rear cover and a front cover have the function of overload protection; a support object and a weight object are respectively connected at the both ends of the portable electronic steelyard. The liquid crystal digitals display the weight. The portable electronic steelyard has the functions of zeroing, tare weight removing and overload protecting. The portable electronic steelyard has the advantages of small size, convenient carrying, multiple purposes, simple structure, low cost, high precision, accurate reading and high safety.

Description

Portable electronic steelyard

The utility model belongs to the electronic-metering technology field.

The electronic scales weighing is fast, precision is high, can dynamically measure, and the automaticity height is so be used for industrial and mining enterprises, communications and transportation, departments such as commerce and trade and scientific research increasingly extensively.But there also do not have a kind of electronic scales to replace to be traditional, and application quantity is bigger, portable Business Machine lever scale.

The purpose of this utility model is the portable electronic scales (Fig. 1) that will provide a kind of liquid crystal digital to show, it can replace portable mechanical lever scale and civilian spring balance effectively.

The purpose of this utility model is achieved in that utilizes LOAD CELLS that weight is converted into electric weight, exports to the measurement display instrument, finishes gage work (Fig. 2).LOAD CELLS resistance-strain type, differential transformer type, condenser type, piezomagnetic, piezoelectric type are arranged and the formula of shaking frequently etc. multiple, what combination property was best is resistance strain type sensor.Its principle is: when the tinsel of resistance strain gage when firmly pasting all-in-one-piece elasticity original paper and bear external force generation elastic deformation jointly, corresponding variation can take place in its length L, sectional area and electricalresistivity, at this moment, being changed to relatively of its resistance R:

ΔR／R＝（1＋2μ）ΔL／L＋Δρ／ρ

The version of elasticity original paper is varied, and the stress distribution graded of thin-walled suspension ring type elasticity original paper 2 is bigger, and the stress point on the elastic body has just to be had negatively, utilizes this characteristics, foil gauge is affixed on elastomeric normal stress point and negative stress point respectively, and connects into differential bridge (Fig. 4).This electric bridge is compared with other measuring bridge, the maximum V of output signal ₀=V Δ R/R, and best linear relationship is arranged, and this thin-walled suspension ring shape resistance strain type sensor (Fig. 3) has lateral force resistance ability preferably, and electrical components such as power supply, measurement display instrument all can be installed in the inside of suspension ring, simplify the structure.

Measure display instrument and adopt direct current, liquid crystal display, microvolt level " ratio type digital voltmeter " Q.The reference voltage of this digital voltmeter inside can share a direct supply E for bridge voltage with sensor, the result that this sampling instrument records, singly be not the output valve of sensor bridge circuit, but it with for the ratio of bridge voltage, thereby eliminated when supply voltage descends influence to measurement result.

Simple and practical zeroing circuit is by potentiometer W and resistance R.Form, the following stomidium of bonnet 3 and protecgulum 6 is strips, and hook axle 4 can upper and lower therein slip, has the function of overload protection.The utility model has the advantages that: volume is little, easy to carry, purposes is many, simple in structure, and cost is low.Numeral shows, precision height, reading standard, safe and reliable.

Concrete structure of the present utility model is provided by following embodiment and accompanying drawing thereof: Fig. 1～portable electronic scales, Fig. 2～schematic diagram, Fig. 3～thin-walled suspension ring type resistance strain type sensor, Fig. 4～differential bridge.

The sequence number and the title of parts are as follows: 1～drop handle, 2～elasticity original paper, 3～bonnet, 4～hook axle, 5～hook, 6～protecgulum, E～power supply, W～potentiometer, Q～digital voltmeter, R1～R2～R3～R4～resistance strain gage.

Describe concrete device and working condition in detail below in conjunction with accompanying drawing:

Support drop handle 1 with hand or other object, weight to be measured is hung on the hook 5.At this moment elastic deformations take place in elasticity original paper 2, and R1 and the R3 resistance that stretched is increased, and R2 and R4 resistance by compression reduce (Fig. 4), have destroyed the equilibrium state of electric bridge, and V is just arranged ₀Digital voltmeter Q is defeated by in generation, demonstrates weight.Be uneven output at the zero point of offset sensor, deadweight of scale body and tare weight, scalable potentiometer W makes digital voltmeter Q show 00.00.

Realize that best way of the present utility model is: flexible member 2 adopts 40Cr Ni Mo to make complete diel, sets up stickup, electroplating assembly line accordingly, the realization this patent that just can get twice the result with half the effort.

Claims

1, a kind of portable electronic scales, this scale is selected resistance strain type sensor for use, it is characterized in that: flexible member 2 adopts thin-walled suspension ring type; Measure display instrument Q and other electrical component and all be installed in suspension ring inside; Bonnet 3 and protecgulum 6 have the function of overload protection; Holder and weight are connected the two ends of scale respectively.

2, portable electronic scales according to claim 1 is characterized in that: measure display instrument Q and the shared direct supply E of differential bridge.