CN2854544Y

CN2854544Y - Force measuring structure of vibration string micro-sensor

Info

Publication number: CN2854544Y
Application number: CN 200520073851
Authority: CN
Inventors: 王风
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-07-25
Filing date: 2005-07-25
Publication date: 2007-01-03
Anticipated expiration: 2015-07-25

Abstract

The utility model relates to a force measurement structure with a vibrating wire puny force sensor, belonging to the measurement instrument field, which is composed of a resilient corrugated tube, a vibrating wire, a vibrating wire protection tube, a magnetic core, a magnetic core fixation rack, a collet and a base. The vibrating wire is arranged inside the vibrating wire protection tube. The two ends of the vibrating wire are respectively positioned at the two bases by the two collets. One end of the protection tube is mutually provided with the base, while the other end of it is kept away from the other base. The vibrating wire is arranged inside the resilient corrugated tube and the magnetic core and magnetic core fixation rack are also arranged inside the resilient corrugated tube, accompanied with the vibrating wire. The two ends of the resilient corrugated tube are mutually provided with the two bases. The resilient corrugated tube belongs to the resilient element of this force measurement structure. Through appropriate parameter design, the distortion rigidity of the axial direction can be restrained between 5.0 and 50.0 KG/mm so as to realize the measurement of the puny force towards this force measuring structure and at the same time to reduce the volume of the force measuring structure and the dimension of the sensor.

Description

The dynamometry structure of the small force transducer of a kind of type vibration wire

Affiliated technical field

The utility model relates to the dynamometry structure of the small force transducer of a kind of type vibration wire, belongs to the surveying instrument field.

Background technology

Vibrating string type sensor can be divided into type vibration wire deformation-sensor and vibrating wire force transducer generally, and strain (stress) meter, displacement meter, crack gauge etc. belong to the type vibration wire deformation-sensor, and osmometer, reinforcing bar meter etc. belongs to vibrating wire force transducer.Both differences are whether sensor internal comprises flexible member, and the effect of flexible member is converted into distortion with power exactly.The type vibration wire deformation-sensor is the elasticity of demand element not, and vibrating wire force transducer must comprise flexible member.

The dynamometry structure is the key component of vibrating wire force transducer, is the major influence factors of transducer range, resolution and stability etc.The dynamometry structure mainly comprises flexible member and string wire, and flexible member is converted into distortion with suffered power, and this distortion passes to string wire, makes string wire produce small elongating or shortening, and the stress of string wire changes, and causes the variation of the natural frequency of vibration.

The dynamometry structure of vibrating wire force transducer generally can have following 3 kinds at present:

The firstth, the steel sheel class, its concrete form is varied, counts example with its typical reinforcing bar, and its dynamometry structure is the housing of sensor, generally does with the 45# steel, and string wire is positioned in the housing.Be characterized in being adapted to measure big load, resolution is small power below the 0.01kg when measuring when requiring resolution generally more than 1.0kg, and this kind dynamometry structure just can't meet the demands;

The secondth, the steel membrane class is counted example with osmotic pressure, and its dynamometry structure is the pressure-bearing steel membrane, and string wire is fixed on the pressure-bearing steel membrane, and deflection deformation takes place when pressure-bearing steel membrane bearing load (being generally hydraulic pressure), causes string wire tensioning or lax.This kind dynamometry structure often makes that the volume ratio of sensor is bigger, and the process technology of pressure-bearing steel membrane is had relatively high expectations, cost of manufacture is higher, and also to be difficult to adapt to resolution be the small force measurement requirement of 0.1kPa when following.

The 3rd is the dynamometry structure of CN1514217A, and its string wire is to be positioned at outside the corrugated tube, makes the dynamometry physical dimension increase a lot, approximately is more than the twice of corrugated tube size, and the dynamometry complex structure, and it is many to introduce error, the cost of manufacture height.

In addition, it is to adopt corrugated tube as sensor outer housing that a kind of vibrating string type strain transducer is arranged, and its structure and the utility model are close, but it belongs to the type vibration wire deformation-sensor, can only measure strain, can not ergometry, and its corrugated tube is not as flexible member, generally neither elastic bellows.

Summary of the invention

Be difficult to measure small power and the bigger deficiency of volume in order to overcome present vibrating wire force transducer dynamometry structure, the utility model provides a kind of dynamometry structure, the dynamometry resolution of this dynamometry structure can reach 0.001kg or 0.01kPa, and its volume has only an elastic bellows size.

The technical scheme that its technical matters that solves the utility model adopts is: to measure small power, then the necessary rigidity of the flexible member of dynamometry structure is very little; Make the volume of dynamometry structure little, must make full use of the space of dynamometry inside configuration.The rigidity of elastic bellows depends primarily on parameters such as material, wall thickness, wave height, wave number, and its rigidity can be adjusted in the larger context, and in the process of its distortion, rigidity value is very stable.By designing the parameter of above-mentioned elastic bellows rightly, can make the axial deformation rigidity value of elastic bellows be positioned at the 5.0-50.0kg/mm scope, thereby adapt to small power Testing requirement.After designing elastic bellows, the volume of elastic bellows has just been determined, in order to reduce the size of dynamometry structure as far as possible, the utility model is also placed in the middle with the inside that string wire has been arranged into elastic bellows, relevant magnetic core, magnetic core fixed mount and string wire sleeve pipes etc. have also entered the inside of elastic bellows together, maximally utilised the space, made that whole dynamometry structure is very compact, size significantly reduces.

The beneficial effects of the utility model are to have realized small force measurement, and reduced the volume of dynamometry structure simultaneously, thereby reduced the size of vibrating wire force transducer.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the utility model one-piece construction synoptic diagram.

Among Fig. 1,1. bearing, 2. chuck, 3. string wire pillar, 4. magnetic core fixed mount, 5. magnetic core, 6. string wire, 7. elastic bellows.

Embodiment

As shown in Figure 1, the utility model is made up of elastic bellows 7, string wire 6, string wire pillar 3, magnetic core 5, magnetic core fixed mount 4, chuck 2 and bearing 1 etc., string wire 6 is centered in the string wire pillar 3, string wire 6 two ends are fixed on two bearings 1 by two chucks 2 respectively, string wire pillar 3 one ends 31 fix with bearing 1, the other end 32 leaves mutually with another bearing 1, and string wire 6 is positioned at the inside of elastic bellows 7, and the two ends of elastic bellows 7 and two bearings 1 fix.The material of elastic bellows 7 is a stainless steel, and its external diameter is that 27.0mm, internal diameter are 13.0mm, and wall thickness is 0.22mm, and wave number is 14, and its radial rigidity is 20kg/mm.String wire is inner placed in the middle at elastic bellows, and magnetic core and magnetic core fixed mount are arranged in a side of string wire, and also are positioned at the inside of elastic bellows.

A typical operation of this dynamometry structure is: when bearing 1 is subjected to extraneous pressure, because elastic bellows 7 two ends all fix with bearing 1, this pressure just is delivered on the elastic bellows 7, and small compression deformation takes place elastic bellows 7, string wire 6 is lax, and its natural frequency of vibration reduces.When the pressure in the external world reduced, elastic bellows 7 produced small elongation strain, string wire 6 tensionings, and its natural frequency of vibration raises.

Claims

1. the dynamometry structure of the small force transducer of type vibration wire, by elastic bellows (7), string wire (6), string wire pillar (3), magnetic core (5), magnetic core fixed mount (4), chuck (2) and bearing compositions such as (1), string wire (6) is positioned at string wire pillar (3), string wire pillar (3) one ends (31) fix with bearing (1), the other end (32) leaves mutually with another bearing (1), the two ends and two bearings (1) that it is characterized in that elastic bellows (7) fix, string wire (6) two ends also fix with two bearings (1) respectively, and string wire (6) is placed in the middle in corrugated tube, magnetic core (5), magnetic core fixed mount (4) also is positioned at the inside of elastic bellows (7).

2. dynamometry structure as claimed in claim 1, the axial deformation rigidity that it is characterized in that elastic bellows (7) is 5kg/mm～50kg/mm.

3. dynamometry structure as claimed in claim 1 is characterized in that the material of elastic bellows (7) can be stainless steel.