CN2898785Y

CN2898785Y - Protector against overload for electronic balance sensor

Info

Publication number: CN2898785Y
Application number: CN 200520121047
Authority: CN
Inventors: 管学忠; 管学锋
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-12-29
Filing date: 2005-12-29
Publication date: 2007-05-09
Anticipated expiration: 2015-12-29

Abstract

A protector against overload for electronic balance sensor comprises a positive position limit member and a reverse position limit member installed on the upside and downside of the sensor load end, which can limit the bidirectional overload deformation of the sensor load end. The utility model is designed scientifically, has the advantages of simple, reasonable and compact structure, convenient installation, which can prevent the damage by the bidirectional impact force of the electronic balance or the overload during transmission and convey. This protection device can guarantee the correctness of the electronic balance measurement, and improve the life-span of the electronic balance.

Description

Anti-overload protoction device of electron balance sensor

Technical field

The utility model relates to the electronic scales product, especially a kind of anti-overload protoction device of electron balance sensor.

Background technology

Sensor is the weighing-up wave source of electronic scales, is the core parts of electronic scales.The degree of accuracy of electronic scales depends on the quality of sensor performance.At present, what electronic scales used is resistance strain type sensor, be a kind of be the function element that power is converted to strain with the metallic elastic body.The network of electrical bridge that its strain ga(u)ge by sticking on the elastic body sensing surface and certain way thereof are formed, under the excitation of electronic scales power supply, the force-sensing sensor of realizable force, strain, resistance variations, four conversion links of change in electric.Usually on pedestal, the other end is hanging shape and far surpasses sensor maximum strain amount an end of sensor by screw retention.Its principle of work is: when power is applied to the loading end of sensor, strain takes place in the strain ga(u)ge on the elastic body of sensor and surface thereof synchronously under the effect of power, thereby produced resistance variations, resistance variations and the change in electric that produces are carried out hardware and software through the PCB circuit board and are handled and can show the corresponding value of weighing.The resistance strain type sensor that existing electronic scales product is adopted when normal the use, can reach precision fully.But, in fact the electronic scales product is in transportation and use, can run into foreign impacts power inevitably or from forward and reverse overload power, the capital causes the distortion of sensor to exceed overload level, thereby the cirrhosis shape that causes sensor, in case sensor produces cirrhosis shape, causes export super large the zero point of sensor, the initial value that has destroyed the electronic scales signal source makes its inefficacy of weighing.This shows, guaranteeing to guarantee that exactly the dependent variable of sensor does not exceed the scope that overload allows under the accurately accurate prerequisite of electronic scale weighing signal source.

Summary of the invention

The purpose of this utility model is the defective that exists at above-mentioned electronic scales, and a kind of anti-overload protoction device of electron balance sensor that prevents that electronic scales from damaging because of overload is provided.

The utility model anti-overload protoction device of electron balance sensor is characterized in that: both sides, the forward locating part that can place restrictions on the forward and reverse overload distortion of sensor loading end and reverse locating part are formed up and down by being installed in the sensor loading end for it.

The design concept of the utility model anti-overload protoction device of electron balance sensor is; maximum deformation quantity after weighing according to sensor is provided with locating part at the sensor loading end; it is spacing to utilize locating part that the deflection of the loading end of sensor is carried out, and prevents that sensor from damaging.

The utility model anti-overload protoction device of electron balance sensor design science, simple and reasonable for structure, compactness, easy for installation.It can prevent electronic scales effectively in transportation and use, the damage that may cause from the forward and reverse impulsive force of electronic scales or overload.The application of this protective device not only can be guaranteed the accuracy of electronic scale weighing, the serviceable life that also can improve electronic scales simultaneously.

The concrete structure of the utility model anti-overload protoction device of electron balance sensor is provided in detail by the following drawings and embodiment.

Description of drawings

Fig. 1 is the structural representation of anti-overload protoction device of electron balance sensor.

Embodiment

Embodiment: from Fig. 1 can be clear that anti-overload protoction device of electron balance sensor by forward locating part 1 and oppositely locating part 2 form.Described forward locating part 1 is by the lengthening substrate 11 that can be butted on sensor 3 loading ends 31 and form sensor loading end gap H1, liner constitutes at the pad 12 of sensor 3 stiff ends 32.Described lengthening substrate 11 offers the through hole 111 for 4 assemblings of sensor 3 dog screws, offers the screw of installing for reverse locating part 2 112 on the lengthening substrate 11 corresponding to sensor loading end 31; Described reverse locating part 2 is made up of screw 21 and baffle plate 22 fixed thereon; Oppositely locating part 2 utilizes screw 21 to be installed on the screw 112 of lengthening substrate 11.

The assembly relation of this anti-overload protoction device of electron balance sensor and sensor: the sensor specified deformation space required according to sensor 3 full scales; select the pad 12 of respective thickness; pad 12 is placed sensor 3

stiff ends

32 and 11 of substrates of lengthening; the sensor 3 that is lined with pad 12 is fixed on the lengthening substrate 11 by the screw 4 that is set in lengthening substrate 11 through holes 111, links into an integrated entity with lengthening substrate 11.Owing to be provided with pad 12 between the two, sensor 3

loading ends

31 and 11 natural formation of lengthening substrate can be for the gap H1 of sensor 3 loading ends 31 distortion.But the deflection of gap H1 limit sensor 3.Then the screw 21 of the band baffle plate 22 of reverse locating part 2 is installed in the screw 112 of lengthening substrate 11 of sensor loading end 31, baffle plate 22 and the sensor 3 end faces H2 that interspaces in advance gets final product.

The principle of work of the utility model anti-overload protoction device of electron balance sensor: during the work of sensor full scale, the loading end 31 of sensor 3 is in the interval internal strain of the gap H1 that sets; When sensor 3 is being subjected to forward when overload, the lengthening substrate 11 that is arranged on the forward locating part 1 of sensor 3 loading ends 31 bottom sides will stop the loading end 31 of sensor 3 to continue distortion in the mode that supports, avoid transshipping and to cause sensor 3 deflections to exceed the specified forward deformation range of sensor, in order to avoid damage sensor 3.When sensor 3 is subjected to reverse overload power, the baffle plate 22 that is arranged on the reverse locating part 2 of sensor 3 loading ends 31 end faces stops sensor 3 to continue distortion to stop mode, avoid reverse overload may cause sensor 3 deflections to exceed the scope of the specified reversal deformation of sensor, and then avoid damaging sensor 3.

Above content is in conjunction with concrete preferred implementation, to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.Under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the utility model is determined by claims of being submitted to.

Claims

1, a kind of anti-overload protoction device of electron balance sensor is characterized in that: both sides, the forward locating part that can place restrictions on the forward and reverse overload distortion of sensor loading end and reverse locating part are formed up and down by being installed in the sensor loading end for it.

2, anti-overload protoction device of electron balance sensor according to claim 1 is characterized in that: described forward locating part (1) is by the lengthening substrate (11) that can be butted on sensor loading end (31) and form sensor loading end gap (H1), liner constitutes at the pad (12) of sensor stiff end (32).

3, anti-overload protoction device of electron balance sensor according to claim 1 is characterized in that: described reverse locating part (2) is made up of screw (21) and baffle plate (22) fixed thereon.

4, according to claim 1 or 2 or 3 described anti-overload protoction device of electron balance sensor; it is characterized in that: described lengthening substrate (11) offers the through hole (111) for sensor dog screw (4) assembling, offers the screw of installing for reverse locating part (2) (112) on the lengthening substrate (11) corresponding to the sensor loading end.

5, anti-overload protoction device of electron balance sensor according to claim 4 is characterized in that: oppositely locating part (2) utilizes screw (21) to be installed on the screw (112) of lengthening substrate (11) of sensor loading end.