CN201417189Y

CN201417189Y - Nine-cylinder type force transducer

Info

Publication number: CN201417189Y
Application number: CN2009201861411U
Authority: CN
Inventors: 胡伟全
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-06-27
Filing date: 2009-06-27
Publication date: 2010-03-03
Anticipated expiration: 2019-06-27

Abstract

The utility model relates to a nine-cylinder type force transducer which is suitable for large range and super-large range force measuring. The transducer adopts a nine-cylinder metal elastomer structure. Furthermore the middle parts of eight peripheral cylindrical elastomers are respectively adhibited with one foil resistance strain gauge, wherein four resistance stain gauges are adhibited longitudinally and four resistance stain gauges are adhibited transversely. Furthermore the eight resistance stain gauges form a Wheatstone bridge according to the sum-difference characteristic thereby finishing the force, strain, resistance and electric signal variation conversion for obtaining the purpose of force measuring. In the nine-cylinder transducer structure, one fixed end is adopted for connecting the elastomer and the housing, and the connection by corrugation diaphragm is adopted at the other end. As the corrugation diaphragm has little effect to the longitudinal stress and has large effect to the lateral stress, the lateral resistance of the transducer is greatly improved, and the precision of the sensor is further improved. Simultaneously the connection mode can well settle the sealing problem for obtaining the moisture resistance and corrosion resistance functions.

Description

The enneastyle force cell

Technical field

The utility model belongs to weight sensing technology field, relates to a kind of enneastyle force cell and is applicable to wide range and super large range force measurement.

Technical background

The pillar force cell is a kind of function element of utilizing pillar metallic elastic body as power conversion strain, it is by strainmeter that sticks on surface of elastomer and the resistance bridge of forming in a certain way, under the additional power source effect, a kind of force cell of realizable force, strain, resistance variations, four conversion links of change in electric.Advantages such as that column type sensor has is simple in structure, easy to process, good rigidly, but the sensor of this structure exists that the anti-side direction ability of sensor is relatively poor, the dynamometry precision is not high, poor sealing performance, the problem of moistureproof, corrosion-resistant ability.

The utility model content

The purpose of this utility model provides a kind of range at 100T---and between the 1000T even the enneastyle force cell of greater amount journey, this kind force cell volume is less relatively, and good seal performance, measuring accuracy are higher.

The utility model adopts following technical scheme: the force cell that is provided is by column type elastomer, shell, the load axle, base, mounting hole, hermetically sealed connector, shielded conductor, foil resistance strain gauge, the semiconductor dummy strain gauge is formed, be characterized in adopting the enneastyle elastomer structure, this enneastyle elastic body is made of the square elastic cylinder that is positioned at central authorities and eight elastic cylinders that are trapped among this cylinder periphery, this enneastyle elastic body surrounds a right cylinder, separate by groove between each elastic cylinder, 8 peripheral elastic cylinders, relative cylinder is symmetry in twos, and respectively paste 1 foil resistance strain gauge in peripheral 8 column type elastomer middle parts, wherein one of foil resistance strain gauge is vertical, horizontal interlaced sticking on 8 peripheral elastic cylinders, described enneastyle elastic body adopts fixed form with the end that is connected of shell, and the other end adopts the convoluted diaphragm connected mode.

Useful improvement of the present utility model also has: the backup rolls of force cell, enneastyle elastic body, base and mounting hole adopt integrative-structure.

Useful improvement of the present utility model also has: vertically paste two compensate semi-conductor's strainometers on two posts of elastic body symmetry, should and be serially connected in the input circuit of electric bridge, the impedance of compensate semi-conductor's strainometer is the 5-10% of bridge resistance.

The utility model adopts the enneastyle elastomer structure, this enneastyle elastic body is made of the square elastic cylinder that is positioned at central authorities and eight elastic cylinders that are trapped among this cylinder periphery, and respectively paste 1 foil resistance strain gauge in peripheral 8 column type elastomer middle parts, wherein the foil resistance strain gauge of vertically pasting is 4, laterally the foil resistance strain gauge of pasting is 4, when the load axle loading force of being weighed is done the time spent, wherein vertically pasting foil resistance strain gauge is subjected to the meridional stress effect and compresses, its resistance value is reduced, laterally the stickup foil resistance strain gauge is subjected to the transverse stress effect and stretches, its resistance value is increased, and 8 foil resistance strain gauges are formed resistance bridge according to electric bridge with the difference characteristic, thereby the power of finishing, strain, resistance, the change in electric conversion, the purpose that reaches dynamometry or weigh.In the enneastyle sensor construction, elastic body adopts fixed form with the end that is connected of shell, the other end adopts the convoluted diaphragm connected mode, because convoluted diaphragm is very little to the meridional stress influence, and it is very big to the side direction stress influence, thereby improved the anti-side direction ability of sensor greatly, further improved the measuring accuracy of sensor, this connected mode can solve sealing problem again simultaneously, reach moistureproof, the corrosion-resistant function, in the enneastyle sensor construction, the semiconductor dummy strain gauge that adopts little resistance compensates the non-linear index of sensor, thereby has also improved the measuring accuracy of sensor.

The utility model is compared with common column type sensor owing to adopted the enneastyle elastomer structure, under equal stressed situation, has increased the physical dimension of elastic body part of the force, has improved the anti-side direction ability of sensor;

The utility model is owing to adopted the enneastyle elastomer structure, compare with common column type sensor, under the situation of same range, because the physical dimension of each column type elastomer is less, in the heat treatment process process, help improving heat treated homogeneity, thereby improve the rigidity of sensor, reduce the hysteresis error and the non-reproducibility error of sensor.

The utility model is guaranteeing under the indeclinable situation of physical dimension owing to adopted the enneastyle elastomer structure, can satisfy the requirement of different ranges by the width of regulating groove between elastic cylinder.

The utility model is because elastic body adopts fixed form with the end that is connected of shell, the other end adopts stainless steel ripple diaphragm connected mode, convoluted diaphragm is very little to the meridional stress influence, and it is very big to the side direction stress influence, thereby improved the anti-side direction ability of sensor greatly, further improved the measuring accuracy of sensor.Simultaneously, this connected mode has well solved the sealing problem of sensor, makes sensor have protection against the tide, corrosion-resistant function, has greatly improved the range of application and the application of sensor.

The utility model has greatly improved the rigidity of sensor and has eliminated the influence of the frictional resistance of generation when sensor is stressed to sensor because backup rolls, base and enneastyle adopt integrative-structure.

The utility model is in the semiconductor dummy strain gauge and the input circuit of string at electric bridge of two little resistances of stickup on the elastic body, when elastic body is stressed, semiconductor dummy strain gauge resistance changes, be that resistance reduces, the virtual voltage of resistance bridge increases, thereby has compensated the sensor deficiency that output signal down decays when stressed.

Characteristics of the present utility model are: in the power of wide range and super large range is measured, the sensor construction in the original technology and the contradiction of measuring accuracy have well been solved, reach both mutual unifications, the sensor of the utility model structure has function easy to process and torque resistant, lateral force resistance simultaneously, is useful in the application in the industries such as track scale, large-scale material level, harbour, boats and ships, iron and steel, oil field.

Description of drawings

The structure cut-open view of Fig. 1 the utility model enneastyle force cell;

Fig. 2 the utility model enneastyle force cell elastic body active view;

Fig. 3 the utility model enneastyle passes dynamometry sensor elastic body vertical view;

Resistance bridge in Fig. 4 the utility model enneastyle force cell;

Fig. 5 the utility model enneastyle force cell stainless steel seal membrane front view;

Fig. 6 the utility model enneastyle force cell stainless steel seal membrane vertical view;

Fig. 7 the utility model enneastyle force cell shell.

Embodiment

Below in conjunction with description of drawings enforcement of the present utility model.Fig. 1 is the structure cut-open view of the utility model enneastyle force cell.Referring to Fig. 1, force cell provided by the utility model is made up of base 1, mounting hole 2, shell 3, nine post elastic bodys 4, foil resistance strain gauge R1-R8 (can see foil resistance strain R1, R2, R8 among Fig. 1), semiconductor dummy strain gauge R9, R10 (can see foil resistance strain R9 among Fig. 1), load axle 5, sealing stainless steel diaphragm 6, hermetically sealed connector 7 and shielded cable 8 etc., separate by groove 9 between the enneastyle elastic body, wherein, hermetically sealed connector 7, shielded conductor 8 adopt outsourcing piece.Fig. 2 is the utility model enneastyle force cell elastic body active view, Fig. 3 is the utility model enneastyle force cell elastic body vertical view, by Fig. 2, Fig. 3 as can be known, elastic body of the present utility model is the enneastyle elastic body that constitutes with the 40CrNiMoA alloy steel material, backup rolls, enneastyle elastic body, base and mounting hole adopt integrative-structure, the enneastyle elastic body adopts special Technology for Heating Processing, has improved elastomeric rigidity and elasticity, satisfies request for utilization.Fig. 4 is the resistance bridge in the utility model enneastyle force cell.R1-R8 is 8 foil resistance strain gauges among Fig. 1, stick on the middle part on peripheral 8 elastic bodys in the enneastyle elastic body respectively, R1 wherein, R3, R5, four foil resistance strain gauges of R7 are vertically pasted, R2, R4, R6, four foil resistance strain gauges of R8 are laterally pasted, when the load axle is stressed, the enneastyle elastic body produces distortion, R1, R3, R5, four resistance strain gages of R7 are subjected to the meridional stress effect and produce compression, resistance value reduces, R2, R4, R6, four resistance strain gages of R8 are subjected to the transverse stress effect to produce stretching, resistance value increases, according to electric bridge with the difference characteristic, when the two ends of electric bridge added a voltage, in addition two ends just had one to be proportional to the electric signal Δ U output that the power value changes, by detecting the size of this signal, can obtain the size of power.Among Fig. 1, R9, R10 are the semiconductor dummy strain gauge of 2 little resistances, its impedance is the 5-10% of bridge resistance, and R9, R10 stick on respectively on two posts of the peripheral symmetry of elastic body, and are vertical stickups, because R9, R10 are serially connected in the input end of electric bridge, when sensor was stressed, its resistance reduced, therefore, the virtual voltage of resistance bridge increases, thereby has compensated the sensor deficiency that output signal down decays when stressed.Fig. 5 is the front view of the utility model enneastyle force cell stainless steel seal membrane, Fig. 6 is the vertical view of the utility model enneastyle force cell stainless steel seal membrane, Fig. 7 is the utility model enneastyle force cell shell, sensor outer housing adopts common alloy steel material to be made, in the assembling of sensor, the method that is connected welding of employing argon arc or electron beam welding of sensor outer housing and elastic body base, stainless steel diaphragm and the method that also adopts argon arc welding or electron beam welding being connected of shell, like this with shell, the effect of lateral force resistance and protection is played in elastic body and firm the combining of stainless steel diaphragm.

Claims

1, a kind of enneastyle force cell, by column type elastomer, shell, the load axle, base, mounting hole, hermetically sealed connector, shielded conductor, foil resistance strain gauge, the semiconductor dummy strain gauge is formed, it is characterized in that adopting the enneastyle elastomer structure, this enneastyle elastic body is made of the square elastic cylinder that is positioned at central authorities and eight elastic cylinders that are trapped among this cylinder periphery, this enneastyle elastic body surrounds a right cylinder, separate by groove between each elastic cylinder, 8 peripheral elastic cylinders, relative cylinder is symmetry in twos, and respectively paste 1 foil resistance strain gauge in peripheral 8 column type elastomer middle parts, wherein one of foil resistance strain gauge is vertical, horizontal interlaced sticking on 8 peripheral elastic cylinders, described enneastyle elastic body adopts fixed form with the end that is connected of shell, and the other end adopts the convoluted diaphragm connected mode.

2, enneastyle force cell according to claim 1 is characterized in that backup rolls, enneastyle elastic body, base and the mounting hole of force cell adopts integrative-structure.

3, enneastyle force cell according to claim 1 and 2, it is characterized in that on two posts of elastic body symmetry, vertically pasting two compensate semi-conductor's strainometers, and be serially connected in the input circuit of electric bridge, the impedance of compensate semi-conductor's strainometer is the 5-10% of bridge resistance.