CN1434268A - Displacement signalling device - Google Patents

Abstract

The invention discloses a displacement signal device, which comprises a potentiometer (2) and a screw rod (8) connected with a measured object, and a shaft and a gear are arranged therebetween, and the vertical movement of the screw rod (8) is controlled by the gear and the shaft translates into rotation of the potentiometer (2). The displacement annunciator can also be provided with two travel switches (5, 5'), which are matched with two cams (6, 6') on the third shaft (7). The output signal of the invention is an analog signal, and after being converted into a digital signal by an analog module, the stroke accuracy of the gate position can reach 1mm, and the structure is simple and the manufacturing cost is low, which can meet the requirements of an intelligent system.

Description

a displacement signal

technical field

The invention belongs to the technical field of measurement and testing, and in particular relates to a displacement signal device, which is especially suitable for measuring gate positions.

Background technique

Now there are many kinds of displacement signal measuring devices in the domestic market. Taking the liquid level gauge as an example, there are many kinds of molded products on the market, but they are all digital, and their prices are relatively expensive. For example, the commercially available ZGC-2 full photoelectric coded gate meter has a range of 0-10m or 0-20m, an accuracy of 0.5cm or 1cm, an error of ±0.2%, and a speed of 0-30cm/s. Moreover, the measurement resolution can only reach 0.5cm, which is difficult to meet various engineering requirements.

Contents of the invention

The object of the present invention is to provide a displacement signal device which can overcome the above-mentioned defects, which has higher measurement accuracy, wider application range and lower cost.

In order to achieve the purpose of the above invention, a displacement signal device includes a potentiometer and a screw rod connected to the measured object, with a shaft and a gear therebetween, through which the vertical movement of the screw rod is converted into the rotation of the potentiometer .

The output signal of the displacement signal device provided by the present invention is an analog signal, and after being converted into a digital signal by an analog module, the travel accuracy of the brake position can reach 1mm, and the structure is simple and the manufacturing cost is low, which can meet the requirements of an intelligent system.

Description of drawings

Fig. 1 is the structural representation of a kind of embodiment of displacement signal device of the present invention

intent(main view);

FIG. 2 is a top view of the displacement signal device shown in FIG. 1 .

Detailed ways

The structure of the present invention is shown in Fig. 1, Fig. 2, comprises the first gear 13 and the second gear 14 that are positioned on the first shaft 9, and the first gear 13 is meshed with the screw mandrel 8 that links to each other with measured object, and the second The gear 14 meshes with the third gear 15 positioned on the second shaft 4, and the second shaft 7 is also provided with a fourth gear 16, and the fourth gear 16 meshes with the fifth gear 17 positioned on the third shaft 7. The other end of the triaxial is equipped with a potentiometer 2. In order to limit its fully open and fully closed strokes, the displacement annunciator also includes two cams 6, 6' positioned on the third shaft 7, and travel switches 5, 5' matched therewith. Support plates 3, 10 are installed at the two ends of the above-mentioned components, and an outer cover 1 is placed over them.

The present invention uses a set of gears 13-17 (marked as z1, z2, z3, z4, z5) to transmit the lifting movement of the screw mandrel 8 to the potentiometer 2, turning the movement into the rotation of the potentiometer, so that the potentiometer's The resistance changes in proportion to the actual position of the screw, and the electrical signal obtained from the potentiometer is input into the computer.

Determination of speed ratio: set screw pitch T, full stroke L, and determine the modulus and number of teeth of Z1 according to the screw and pitch.

Then Z1 section garden perimeter L1＝3.14*m1*Z1

Z1 speed, n1=L/L1

Set the rotation angle of the potentiometer to 320°, n2=320/360

Gear ratio I＝n1/n2＝Z3*Z5/(Z2*Z4)

It can be seen from the description of the above principles and structures that the above specific structure is not the only implementation of the present invention, and the number of shafts and gears between the screw rod and the potentiometer can be set according to the size of the stroke interval of the measured object. Its travel range is large, so it is necessary to set up multiple shafts and gears, and vice versa.

The displacement annunciator can cooperate with the computer remote automatic control system of the reservoir gate to be used as a response gate screw displacement instrument for the switch.

The basic working principle of the displacement signal device of the present invention is to convert the vertical motion of the brake position into circular motion through gear meshing, and then use an angular displacement precision potentiometer to collect and convert it into an electrical signal, and send it to the PLC for processing. At the same time, the stroke limit of fully open and fully closed is also realized by using two cams and two micro-motion travel switches. The whole device is small and beautiful, easy to install, and has high measurement accuracy. After on-site inspection, its work is stable and reliable, and its transmission accuracy exceeds other products of the same kind.

Claims (3)

1, a kind of displacement signal device, is provided with gear, is characterized in that: it comprises potentiometer (2) and the screw mandrel (8) that is connected with measured object, is provided with shaft and gear therebetween, by gear and shaft the screw mandrel The vertical movement of (8) is converted into the rotation of said potentiometer (2). 2. The displacement signal device according to claim 1, characterized in that: there are three shafts (9, 4, 7), the first shaft (9) is equipped with first and second gears (13, 14), The 3rd, the 4th gear (15,16) are housed on the 2nd shaft (4), the 5th gear (16) and potentiometer (2) are housed on the 3rd shaft (7), the first gear (13) and screw mandrel (8) engagement, the second gear (14) is engaged with the third gear (15), the fourth gear (16) and the fifth gear (17). 3. The displacement annunciator according to claim 1 or 2, characterized in that: the displacement annunciator is also provided with two travel switches (5, 5'), which are connected with two travel switches located on the third axis (7). Cams (6, 6') match.

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