CN211234647U

CN211234647U - Five-column type weighing sensor

Info

Publication number: CN211234647U
Application number: CN201922039400.4U
Authority: CN
Inventors: 姚玉明; 朱炜道; 柯建东
Original assignee: KELI SENSING TECHNOLOGY (NINGBO) CO LTD
Current assignee: KELI SENSING TECHNOLOGY (NINGBO) CO LTD
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-08-11
Anticipated expiration: 2029-11-21

Abstract

The utility model discloses a five-column type weighing sensor, relating to the technical field of weighing sensors; the utility model provides a five-column type weighing sensor, includes the elastomer, is located four strainometers on the elastomer, the elastomer includes upper segment, hypomere, is the center pillar of cuboid, four limit posts, center pillar, limit post are located between upper segment and the hypomere, the equal rigid coupling in center pillar, limit post top is in the upper segment bottom, the equal rigid coupling in hypomere top in center pillar, the limit post uses the axle of center pillar to arrange as center pin annular array, the strainometer is located four sides of center pillar respectively, all be equipped with the semiconductor strainometer on the limit post, four strainometers interconnect are located a Wheatstone bridge, the semiconductor strainometer is established ties each other and is constituted a semiconductor cluster, the semiconductor cluster is located Wheatstone bridge's input or output, semiconductor cluster both ends parallel connection has a fixed resistance. The utility model discloses it is accurate to measure.

Description

Five-column type weighing sensor

Technical Field

The utility model belongs to the technical field of weighing sensor, in particular to five-column type weighing sensor.

Background

At present, the column type sensor is widely applied to various electronic weighing devices such as various motor scales, rail scales, axle load scales, material tank scales and the like. The column type sensor is generally of a double-rocking-column structure, and the elastic body of the column type sensor is of a single pure column or shear column structure. When the elastic body bending test device is used, the resultant force direction of the load must be coaxial with the elastic body, if the resultant force direction deviates from the axis of the elastic body, the elastic body can be subjected to bending moment, the elastic body bends, strain of strain gauges on the elastic body is inconsistent, and the voltage of an output end is small.

In addition, only the length change of the strain gauge is referred to when calculating the voltage of the strain gauge, and the width change (poisson effect) generated by the deformation of the strain gauge is ignored, so that the voltage of the output end is smaller than the true value.

Disclosure of Invention

The utility model aims at overcoming prior art and measuring inaccurate and neglect strainometer width change and measure inaccurate shortcoming under the condition of load slope or unbalance loading, provide a five column type weighing sensor, measure accurately.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a five-column type weighing sensor, includes the elastomer, is located four strainometers on the elastomer, the elastomer includes upper segment, hypomere, is the center pillar of cuboid, four limit posts, center pillar, limit post are located between upper segment and the hypomere, the equal rigid coupling in center pillar, limit post top is in the upper segment bottom, the equal rigid coupling in hypomere top in center pillar, the limit post uses the axle of center pillar to arrange as center pin annular array, the strainometer is located four sides of center pillar respectively, all be equipped with the semiconductor strainometer on the limit post, four strainometers interconnect are located a Wheatstone bridge, the semiconductor strainometer is established ties each other and is constituted a semiconductor cluster, the semiconductor cluster is located Wheatstone bridge's input or output, semiconductor cluster both ends parallel connection has a fixed resistance. When the load is unbalanced or inclined, the resistance formed by the parallel connection of the semiconductor string and the fixed resistor is reduced, the divided voltage is reduced, and the total output voltage is increased, so that the compensation effect is realized; the error caused by the poisson effect can also be compensated by the semiconductor string and the fixed resistor when there is a positive voltage, the resistance of the fixed resistor being obtained by experiment.

Preferably, a support plate is arranged below the elastic body, a positioning groove is formed in the support plate, the bottom end of the elastic body is located in the positioning groove and abuts against the bottom of the positioning groove, an annular boss is arranged on the periphery of the lower section of the elastic body, an anti-tilting sleeve is arranged between the boss and the support plate and sleeved on the lower section, the top end of the anti-tilting sleeve abuts against the boss, and the bottom end of the anti-tilting sleeve abuts against the support plate. The constant head tank plays the effect of location, and the anti-tilt cover prevents that the elastomer from taking place to incline, thereby when the elastomer takes place to incline, thereby anti-tilt cover one side can seriously pressurized exert great elasticity to the boss and prevent that the elastomer from taking place to incline.

Preferably, the side surface of the upper section is a cylindrical surface, the cross section of the side column is in a fan shape, the central angle of the fan shape is a right angle, the circular arc of the fan shape is positioned on the cylindrical surface of the upper section, one of the right-angle sides of the fan shape is parallel to one of the side surfaces of the side column, the lower section comprises a first section, a second section and a third section which are arranged from top to bottom, the side surface of the first section is positioned on the cylindrical surface, the bottom end surface of the first section forms the boss between the side surfaces of the first section and the second section, and the third section is positioned in the positioning groove. Has symmetry and is convenient to process.

Preferably, the second section is a cylinder coaxial with the first section, and the anti-tilting sleeve is sleeved on the second section and is matched with the second section. The structure is simple.

Preferably, the cross section of the third section is rectangular, the bottom end of the third section is in a convex spherical shape, and the cross section of the positioning groove is matched with the third section. The cooperation of third subsection and constant head tank can prevent that the elastomer from taking place to rotate.

Preferably, the elastic body is sleeved with a trumpet-shaped waterproof cover, one end with a large waterproof cover area faces downwards, the other end of the waterproof cover is fixedly connected to the side face of the upper section, an annular film is arranged at the lower end of the waterproof cover, the outer edge of the film is fixedly connected with the lower end of the waterproof cover, and the inner edge of the film is fixedly connected with the side face of the lower section. Waterproof and dustproof, and water falls to the waterproof cover and falls along the surface. Can not fall into the positioning groove.

Preferably, the bottom of the positioning groove is planar. The processing is convenient.

Preferably, the elastomer is of an integrally molded construction. The processing is convenient.

The utility model has the advantages that: the utility model provides a five-column type weighing sensor, which has accurate measurement; waterproof dustproof prevents inclining, simple structure.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a top view of the support plate;

FIG. 4 is a cross-sectional view B-B of FIG. 1;

fig. 5 is a schematic circuit diagram of the present invention.

In the figure: the elastic body 1, the upper section 3, the lower section 4, the middle column 5, the side column 6, the strain gauge 7, the semiconductor strain gauge 8, the support plate 11, the positioning groove 12, the boss 13, the anti-roll sleeve 14, the steel sleeve 16, the first clamping groove 17, the second clamping groove 18, the first section 19, the second section 20, the third section 21, the waterproof cover 22, the film 23, the rubber sleeve 24 and the fixed resistor 25.

Detailed Description

The invention will be further explained in detail with reference to the drawings and the following detailed description:

example (b):

referring to fig. 1 to 5, a five-column weighing sensor includes an integrally formed elastic body 1, and four strain gauges 7 located on the elastic body 1, where the elastic body 1 includes an upper section 3, a lower section 4, a central column 5 in a rectangular parallelepiped shape, and four side columns 6, the central column 5 and the side columns 6 are located between the upper section 3 and the lower section 4, the side surface of the upper section 3 is a cylindrical surface, the cross section of the side columns 6 is a sector, the central angle of the sector is a right angle, the circular arc of the sector is located on the cylindrical surface of the upper section 3, one of the right-angle sides of the sector is parallel to one of the side surfaces of the side columns 6, the lower section 4 includes a first section 19, a second section 20, and a third section 21 arranged from top to bottom, the cross section of the third section 21 is a rectangular shape, the bottom end of the third section 21 is a convex spherical surface, the side surface of the first section 19 is located above, the second section 20 is a cylinder coaxial with the first section 19, the top ends of the middle column 5 and the side column 6 are fixedly connected to the bottom end of the upper section 3, the bottom ends of the middle column 5 and the side column 6 are fixedly connected to the top end of the lower section 4, the side column 6 is arranged in an annular array by taking the shaft of the middle column 5 as a central shaft, four strain gauges 7 are respectively positioned on four side surfaces of the middle column 5, semiconductor strain gauges 8 are respectively arranged on the side column 6, the four strain gauges 7 are mutually connected and positioned on a Wheatstone bridge, the semiconductor strain gauges 8 are mutually connected in series to form a semiconductor string, the semiconductor string is positioned on the input end or the output end of the Wheatstone bridge, and two ends of the semiconductor string are connected in parallel with a; a supporting plate 11 is arranged below the elastic body 1, a positioning groove 12 is arranged on the supporting plate 11, and the bottom of the positioning groove 12 is planar; the bottom end of the elastic body 1 is positioned in the positioning groove 12 and abuts against the bottom of the positioning groove 12, and the cross section of the positioning groove 12 is matched with the third section 21; the third section 21 is positioned in the positioning groove 12; an annular boss 13 is arranged on the periphery of the lower section 4 of the elastic body 1, the boss 13 is formed between the side surfaces of the first section 19 and the second section 20 by the bottom end surface of the first section 19, an anti-tilting sleeve 14 is arranged between the boss 13 and the supporting plate 11, the anti-tilting sleeve 14 is sleeved on the lower section 4, and the anti-tilting sleeve 14 is sleeved on the second section 20 and is matched with the second section 20; the anti-tilt sleeve 14 comprises a rubber sleeve 24 and a steel sleeve 16 located in the rubber sleeve 24, a first clamping groove 17 is formed in the position, corresponding to the steel sleeve 16, of the boss 13, the upper end face of the steel sleeve 16 extends out of the rubber sleeve 24 and is inserted into the first clamping groove 17, a second clamping groove 18 is formed in the position, corresponding to the steel sleeve 16, of the support plate 11, the lower end face of the steel sleeve 16 extends out of the rubber sleeve 24 and is inserted into the second clamping groove 18, the top end of the rubber sleeve 24 abuts against the boss 13, and the bottom end of the rubber sleeve 24 abuts against the support plate 11.

The cover is equipped with the buckler 22 that is tubaeform on the elastomer 1, the one end that the buckler 22 area is big is down, the buckler 22 other end rigid coupling is on the side of upper segment 3, the buckler 22 lower extreme is equipped with and is annular film 23, the lower extreme rigid coupling of film 23 outer fringe and buckler 22, the side rigid coupling of film 23 inner edge and hypomere 4.

Principle of embodiment:

the resistor formed by connecting the semiconductor string and the fixed resistor in parallel is regarded as a self-compensating resistor.

The self-compensating resistor may be connected either at the output or at the input, assuming the connection is made at the output to make the expansion.

Place elastomer 1 vertically, when elastomer 1 is perpendicular atress, resultant force passes through the axle of elastomer 1, and this moment, strainometer 7 atress is even, and semiconductor strainometer 8 atress is even, and this moment, semiconductor strainometer 8's resistance reduces in step, and the resistance of semiconductor cluster reduces, and the resistance of self-compensating resistance also reduces, consequently just reduces the partial pressure to the output to make total output voltage be the increase trend and change, play the effect of compensating voltage, with the produced voltage error of reduction center pillar poisson effect.

When the sensor is inclined or unbalanced-loaded, the strain of the semiconductor strain gauge and the strain gauge is inconsistent, the resistance of the semiconductor string is reduced in a gradient manner, the resistance of the self-compensating resistance is correspondingly reduced, the partial voltage of the output end is correspondingly reduced, and therefore the total output voltage is changed in a gradient increasing trend, the total output voltage is greatly improved, the self-compensating increasing effect is achieved on the trend that the output voltage is slightly small due to the inclination or the unbalance loading, the measurement error caused by the inclination or the unbalance loading can be effectively avoided, the resistance of the fixed resistance is determined through tests, the error caused by the Poisson effect, the inclination or the unbalance loading can be compensated to the optimal requirement, and the measurement accuracy of the sensor is improved.

The constant head tank plays the effect of location, and the anti-tilt cover prevents that the elastomer from taking place to incline, thereby when the elastomer takes place to incline, thereby the anti-tilt cover one side can be seriously pressurized and apply great elasticity to the boss and prevent that the elastomer from taking place to incline, in addition, because the existence of steel bushing, it is bigger to the elasticity that the boss was applyed, and the existence of first draw-in groove and second draw-in groove, the steel bushing can not slide, guarantees that the anti-tilt cover is stable.

Claims

1. The utility model provides a five column type weighing sensor, includes the elastomer, is located four strainometers on the elastomer, its characterized in that, the elastomer includes upper segment, hypomere, is the center pillar of cuboid, four limit posts, center pillar, limit post are located between upper segment and the hypomere, the equal rigid coupling in center pillar, the equal rigid coupling in hypomere top in limit post top, the limit post uses the axle of center pillar to arrange as center pin annular array, the strainometer is located four sides of center pillar respectively, all be equipped with the semiconductor strainometer on the limit post, four strainometers interconnect are located a wheatstone bridge, the semiconductor strainometer is established ties each other and is constituted a semiconductor cluster, the semiconductor cluster is located wheatstone bridge's input or output, semiconductor cluster both ends connect in parallel have a fixed resistance.

2. The five-column weighing sensor according to claim 1, wherein a support plate is arranged below the elastic body, a positioning groove is arranged on the support plate, the bottom end of the elastic body is positioned in the positioning groove and abuts against the bottom of the positioning groove, an annular boss is arranged on the periphery of the lower section of the elastic body, an anti-tilting sleeve is arranged between the boss and the support plate, the anti-tilting sleeve is sleeved on the lower section, the top end of the anti-tilting sleeve abuts against the boss, and the bottom end of the anti-tilting sleeve abuts against the support plate.

3. The five-column weighing cell of claim 2, wherein the side surface of the upper section is a cylindrical surface, the cross section of the side column is a sector, the central angle of the sector is a right angle, the circular arc of the sector is positioned on the cylindrical surface of the upper section, one of the right-angled edges of the sector is parallel to one of the side surfaces of the side column, the lower section comprises a first section, a second section and a third section which are arranged from top to bottom, the side surface of the first section is positioned on the cylindrical surface, the bottom end surface of the first section forms the boss between the side surfaces of the first section and the second section, and the third section is positioned in the positioning groove.

4. The five-column load cell of claim 3, wherein the second segment is a cylinder coaxial with the first segment, and the anti-roll sleeve is disposed over and mated with the second segment.

5. The five-column weighing sensor according to claim 3, wherein the cross section of the third section is rectangular, the bottom end of the third section is in the shape of a convex spherical surface, and the cross section of the positioning groove is matched with the third section.

6. The five-column type weighing sensor according to claim 1, wherein a trumpet-shaped waterproof cover is sleeved on the elastic body, one end of the waterproof cover with a large area faces downwards, the other end of the waterproof cover is fixedly connected to the side surface of the upper section, an annular film is arranged at the lower end of the waterproof cover, the outer edge of the film is fixedly connected to the lower end of the waterproof cover, and the inner edge of the film is fixedly connected to the side surface of the lower section.

7. The five-column load cell of claim 2, wherein the bottom of the detent is planar.

8. The five-column load cell according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the elastomer is of an integrally molded structure.