CN201311333Y

CN201311333Y - Stress measurement sensor

Info

Publication number: CN201311333Y
Application number: CNU2008201661980U
Authority: CN
Inventors: 顾增华; 凌行峰; 戴明新
Original assignee: HANGZHOU ZHENHUA INDUSTRIAL WEIGHING S&T Co Ltd; Hangzhou Qianjiang Weighing Technology Co Ltd
Current assignee: Hangzhou Qianjiang Weighing Technology Co., Ltd.
Priority date: 2008-10-27
Filing date: 2008-10-27
Publication date: 2009-09-16
Anticipated expiration: 2018-10-27

Abstract

Disclosed is a stress measurement sensor, which can effectively solve the weaknesses of non-linearity and unstable zero, wherein a deformation control area (1), a sensitive area (2) and a separation area (4) are arranged on a ring-shaped cylinder, a strain foil (6) is attached to the sensitive area, and four ribs (3) which are evenly arranged in circumference and are symmetrical at the radial direction are arranged on the outer wall of the cylinder. The stress measurement sensor is characterized in that the width of the two ribs at the I-III radial direction is larger than that of the two ribs at the II-IV radial direction. The utility model is suitable for being used as a plug-in stress measurement sensor.

Description

The stress measurement sensor

Technical field

The utility model relates to uses the device that character that resistance changes with amount of force is come metering power or stress.

Background technology

The filling type force cell is the device of the stressed size of Measuring Object.For example, filling type sensor caulked is installed on the mounting hole of rail, when the railcar wheel acts on rail, cause that by gravity steel rail deformation causes the deformation of sensor corresponding position, make the foil gauge resistance variations, the output of the electric signal that changes, calculate thus measure stressed size.

Filling type force cell in the prior art, first kind of circular cone mesa structure sensor that adopts as Fig. 7, Japanese firm shown in Figure 8, because of this structure is that whole interface contacts with the rigid structure body, belong to interference fit, by transmitting in the stress path with the rigid structure body, because surface of contact is excessive, and along with the increase that acts on external force on the rigid structure body, the circular hole of sensor installation will be tending towards becoming elliptical aperture, the variation of the contact area between this sensor and the rigid structure body finally can cause the nonlinearity erron of sensor output signal bigger.

Second kind as Fig. 9, the cylindrical structure sensor that German company shown in Figure 10 adopts, this sensor is at the sensor surface that contacts with rigid structure body annular knurl painstakingly, try hard to realize the pattern of interference fit, but in case after being installed in the hand-hole, originally on sensor and the rigid structure contact level, make good annular knurl and will stick with paste into face and contact, thereby just produced situation with first kind of structural similarity, add that this sensor elastomer is thinner, in case assemble not in place or want to pull down when reinstalling, will become waste product, and measuring accuracy is lower, uses as switching signal usually.

The third tactic pattern, as Figure 11, shown in Figure 12, the wide contour fin cone filling type force cell that began to develop cooperatively in 1989 for units such as Hangzhou Qianjiang Weighing Technology Co., Ltd and Liuzhou railway Institute Of Science And Technologies, owing to four wide contour reasons of fin, when sensor such as Fig. 5 assemble, be subjected to external force P=＞0 o'clock, as Fig. 4, shown in Figure 6, mounting hole is tending towards being varied to elliptical aperture by circular hole, and the I-III direction increases the sensor extruding force, and II-IV direction extruding force reduces.When pretightning force hour, two contour fins of sensor II-IV direction will produce the gap in loading process and between the rail, thereby make sensor response generation non-linear; When pretightning force is excessive, two boss of I-III will produce excessive contact stress and cause the local plastic of rigid body, bring the instability at zero point to sensor.

The 4th kind of tactic pattern: make up force cell (being so-called triangular filling type force cell) as Figure 13, filling type shown in Figure 14, this sensor is at aspects such as elastomeric design, installation and mechanical analyses, all run counter to the ultimate principle of sensor measurement, when this tactic pattern is selected the form (or selecting its patch location on the optional position of the responsive sheet of its dynamometry) of its foil gauge in any case, all can't realize the measurement and the mechanical analysis of rail wheel load.In case, this sensor application in---such as: in the Important Project projects such as the lifting of transportation by railroad, molten steel metering, molten iron Level Detection, port and pier, bridge tunnel, being used as engineering mechanics and robotization detects, sensor does not have corresponding output signal to change forever because this type of sensor increases along with load, not only can bring irreparable damage to national wealth this moment, the serious accident involving serious consequences that can cause casualties also, consequence is hardly imaginable!

Summary of the invention

The utility model to solve the filling type force cell easily produce nonlinearity erron and zero point problem of unstable, a kind of stress measurement sensor of the present utility model is provided for this reason, this sensor can effectively overcome shakiness at non-linear and zero point.

For addressing the above problem, the technical solution adopted in the utility model is to be provided with Deformation control district, sensitizing range and isolated area on the annular cylindrical shell, be fitted with foil gauge on the sensitizing range, described cylinder body outer wall is provided with four fins of circumferentially uniform and radial symmetry, and what it was special is to be in the width of I-III described two fins radially greater than the width that is in II-IV described two fins radially.

Because the utility model I-III direction two fin width are greater than the width of II-IV direction two fins, the sensor that makes the rail circular hole of packing into is when stressed, because of the surface of contact of I-III direction two fins bigger, so the contact stress (pressure) that produces is less, and the deformation of mounting hole can reduce relatively, so neither can make II-IV direction two fin places produce the gap, can not make I-III direction two fins produce excessive contact stress again, can effectively improve sensor nonlinearity erron and zero point problem of unstable.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is that Figure 1A-A analyses and observe 45 ° of synoptic diagram of rotation;

Fig. 3 be rail external force when acting as zero mounting hole be circular synoptic diagram;

Fig. 4 is the effect of rail external force greater than zero the time, and mounting hole becomes oval synoptic diagram by circle;

Fig. 5 is that existing contour fin filling type force cell is installed on rigidity part circular port synoptic diagram;

Fig. 6 is that existing contour fin filling type force cell is installed on rigidity part circular port I-III direction and is subjected to external force to make the time spent circular port to become ellipse diagram hole II-IV direction two fin places and produce synoptic diagram at interval;

Fig. 7 is existing circular cone structure filling type force cell profile synoptic diagram;

Fig. 8 is that Fig. 7 K is to synoptic diagram;

Fig. 9 is existing drum annular knurl structure filling type force cell profile synoptic diagram;

Figure 10 is that Fig. 9 sensor side is to synoptic diagram;

Figure 11 is existing contour fin filling type load cell structure synoptic diagram;

Figure 12 is that Figure 11 B-B analyses and observe 45 ° of synoptic diagram of rotation;

Figure 13 is that existing triangular filling type force cell is installed on rigidity part synoptic diagram;

Figure 14 is existing triangular filling type force cell cross-sectional structure synoptic diagram.

Be labeled as among the figure: 1 Deformation control district, 2 sensitizing ranges, 3 fins, 4 isolated areas, 5 compensating plates, 6 foil gauges, 7 fluid sealants, 8 shielded cables, 9 rigidity part such as rail, 10 mounting holes, 11 wide contour fin filling type force cells, 12 3 fin filling type force cells, 45 ° of Along ent signals on I, II, III, the IV circumference, P external force.

Embodiment

The stress measurement sensor, the annular cylindrical shell is provided with Deformation control district 1, sensitizing range 2 and isolated area 4, be fitted with foil gauge 6 on the sensitizing range, be provided with compensating plate 5 in the cylindrical shell, the sensor outer end is connected with shielded cable 8, cylinder body outer wall is provided with four fins 3 of circumferentially uniform and radial symmetry, and the width that is in I-III two fins radially is greater than the width that is in II-IV two fins radially.

Claims

1, stress measurement sensor, the annular cylindrical shell is provided with Deformation control district (1), sensitizing range (2) and isolated area (4), be fitted with foil gauge (6) on the sensitizing range, described cylinder body outer wall is provided with four fins (3) of circumferentially uniform and radial symmetry, it is characterized in that being in the width of I-III described two fins radially greater than the width that is in II-IV described two fins radially.