CN2178885Y

CN2178885Y - Sensor with self-reset micro-displacement

Info

Publication number: CN2178885Y
Application number: CN 93235562
Authority: CN
Inventors: 李堃武; 黄士新
Original assignee: XINWEI AUTOMATION EQUIPMENT ENGINEERING Co SHANGHAI
Current assignee: XINWEI AUTOMATION EQUIPMENT ENGINEERING Co SHANGHAI
Priority date: 1993-12-14
Filing date: 1993-12-14
Publication date: 1994-10-05
Anticipated expiration: 2003-12-14

Abstract

The utility model relates to a sensor with self-reset micro-displacement, comprising a housing, a measuring rod, a sliver-shaped resistance element pasted to the inner wall of the shell in axial direction, an electric brush fixed to the bottom end of the measuring rod and capable of movably contacting with the resistance element as well as a return spring resetting from the measuring rod. The sensor with self-reset micro-displacement can be used for replacing common differential transformer-typed linear displacement sensors used at present. Because coils are not needed to serve as sensing elements, difficult processes, such as manufacturing coils and installing guide rails of the measuring rod, etc. are cancelled, and the interference in external electromagnetic field can be avoided.

Description

Sensor with self-reset micro-displacement

The utility model relates to the linear pattern displacement transducer, relates in particular to a kind of from resetting micro-displacement sensor.

Existing displacement transducer, Chang Yong homemade TD-1 type differential transformer type linear displacement transducer for example, be on the coil holder that can insert movable core around on three groups of coils (as shown in Figure 1), leading to alternating current on the coil II, according to the relative position between iron core and coil I, the coil III, on coil I and coil III, induce correspondent voltage respectively and change.In order not make iron core depart from the axis of coil holder, also need on axle, set up guide rail, so its structure of the displacement transducer of Gou Chenging is comparatively complicated thus in order to secured core.And inductive coil is subject to external electromagnetic field and disturbs, and causes measuring error easily.

The purpose of this utility model be to provide a kind of simple in structure, the linearity good, the micro-displacement sensor that is not subjected to external electromagnetic field to disturb and have runback potential energy power.

To achieve these goals, of the present utility modelly comprise housing and sounding rod from the micro-displacement sensor that resets, the front end of housing has through hole, sounding rod via this through hole can along described housing axially, be arranged on versatilely in the described housing; Described micro-displacement sensor also comprises the strip resistive element that posts on the inner walls axial location, the brush that be fixed on described sounding rod bottom, can contact with strip resistive element maintenance activity, and with so that the back-moving spring that described sounding rod resets; An electric connecting point respectively is set at least one end points of described brush and described resistive element.

Of the present utility model from the micro-displacement sensor that resets, owing to need not to adopt coil as sensing element, thus exempted the making coil, the technology that difficulty such as mounting guide rail are bigger, and can avoid being subjected to the interference of external electromagnetic field.In addition, of the present utility model from the micro-displacement sensor that resets owing to for example can adopt the linear conductance plastics as resistive element, so can further improve the measure linear degree and the measuring accuracy of sensor.

Be described in further detail from the micro-displacement sensor that resets of the present utility model below in conjunction with drawings and Examples.

Fig. 1 is the structural representation of a kind of differential transformer type linear displacement transducer commonly used in the prior art;

Fig. 2 is the structural representation of the utility model from the micro-displacement sensor that resets;

Fig. 3 is the side view (part has been done to analyse and observe) of sensor shown in Figure 2.

Referring to Fig. 2 and Fig. 3, the micro-displacement sensor that resets certainly of the present utility model comprises housing 9, sounding rod 1, pulley 2, back-moving spring 3, brush 4, mobile slips 5, strip resistive element 6, and is arranged on the fixed support 8 on housing 9 outer walls.Wherein, the front end of housing 9 has through hole 90, and sounding rod 1 is arranged in the housing 9 movably via through hole 90.The external diameter of the internal diameter of through hole 90 and sounding rod 1 should be arranged to make sounding rod 1 can along housing 9 axially, at housing 9 inside and outside moving linearlies.Mobile slips 5 and brush 4 for example are arranged on the bottom 10 of sounding rod 1 by welding, resistive element 6 post on housing 1 inwall can with brush 4 maintenance activity position contacting on, its length direction along housing 1 axially.Resistive element 6 for example can adopt the conductive plastics matrix; Brush 4 for example can adopt copper sheet, utilizes the elasticity of himself that the activity that keeps good with resistive element 6 is contacted.Near also for example being provided with one respectively in order to the pulley axle 20 and the spring fixed reference 7 of pulley 2 to be installed on the inwall of housing 9 front and back ends by riveted joint.Back-moving spring 3 is nested in the groove of pulley 2, and the one end is fixed on the spring fixed reference 7, and the other end is fixed on the bottom 10 of sounding rod 1, utilizes its convergent force that the measuring junction 12 of sounding rod is stretched out outside the housing 9.When measuring junction 12 is experienced the displacement of measurand, and when driving brush 4 and on resistive element 6 surfaces, slide, can change the resistance value between brush 4 and resistive element 6 end points by sounding rod 1.By on the brush 4 and at least one end points of resistive element 6 two-end-points, respectively pick out a lead and be connected on the measurement instrument, the displacement that records can be converted to analog electrical signal and be sent to measurement instrument.

According to the micro-displacement sensor that resets certainly of the utility model design, measurement range is)-20mm, 0-100mm, measuring accuracy is 1-2%, resolution is 0.01 μ m.

Certainly, Fig. 2 and shown in Figure 3 only for the utility model from resetting a preferred embodiment of micro-displacement sensor.As a kind of conversion, back-moving spring 3 also can be replaced with the compression spring that a kind of diameter is slightly less than housing 9 internal diameters, and it is arranged between the bottom and the rear end in the housing 9 of sounding rod 1.Yet suchlike conversion does not exceed scope of the present utility model.

Claims

1, a kind of from resetting micro-displacement sensor, comprise housing and sounding rod, the front end of described housing has through hole, described sounding rod is via this through hole, along axially being arranged on movably in the described housing of described housing, it is characterized in that, described micro-displacement sensor also comprises the strip resistive element that posts on described inner walls axial location, be fixed on the bottom of described sounding rod, the brush that can contact with described strip resistive element maintenance activity, and with so that the back-moving spring that described sounding rod resets respectively is provided with an electric connecting point at least one end points of described brush and described resistive element.

2, as claimed in claim 1 from resetting micro-displacement sensor, it is characterized in that, near on the inner walls of described through hole a pulley is being set, described back-moving spring is nested in the groove of described pulley, the one end is fixed on described housing near on the inwall of rear end, and the other end is fixed on the bottom of described sounding rod.

3, as claimed in claim 1 or 2 from resetting micro-displacement sensor, it is characterized in that described sensor further comprises the mobile slips that is arranged on described sounding rod bottom.

4, the micro-displacement sensor that resets certainly as claimed in claim 1 is characterized in that described back-moving spring is a compression spring, and described compression spring is arranged between the bottom and the rear end in the described housing of described sounding rod.

5, as claimed in claim 1 from resetting micro-displacement sensor, it is characterized in that described resistive element is the conductive plastics matrix.

6, as claimed in claim 1 from resetting micro-displacement sensor, it is characterized in that further comprising the fixed support that is arranged on the described housing outer wall.