CN102435159A - Quick Calibration Stand for Pull Wire Displacement Meter - Google Patents

Abstract

The invention relates to a quick calibration device of a stay wire type displacement meter, belonging to the instrument and meter class. The device comprises a base 1, positioning holes 4 with equal intervals, inserting columns 5, a stop block 2 for fixing a displacement meter 8, a screw hole 3 for fixing the displacement meter 8 and a displacement meter fixing screw 7; wherein, the base 1 of the calibration frame is provided with positioning holes 4 with equal intervals, the displacement meter 8 is fixed on the base 1 through a raised stop block 2 on the base 1 and a screw 7 arranged in a screw hole 3, and the extension length of a pull wire 6 of the displacement meter is adjusted through a pull column 5 arranged in the positioning hole 4 to generate the displacement of a determined difference value. The invention has the following advantages: the on-site rapid calibration of the stay wire type displacement meter can be realized without using other high-precision measuring tools, and the stay wire type displacement meter has the advantages of simple structure, convenient use and low manufacturing cost.

Description

Quick Calibration Stand for Pull Wire Displacement Meter

technical field

The invention relates to a calibration device for displacement meters, which is used for quick calibration of pull-wire displacement meters and belongs to the category of instruments and meters.

Background technique

The pull-wire displacement meter is a commonly used relative displacement measurement device, and its commonly used range is from 5mm to 500mm. It needs to be checked and calibrated for its sensitivity in laboratory and field tests, especially in the test environment, often Manually pulling out the cable and using a steel tape to perform auxiliary calibration and calibration, not only the calibration accuracy cannot be guaranteed, but also the operation is extremely inconvenient. However, conventional calibration with a vernier caliper calibration frame for measurement is not only expensive, but also takes a long period of debugging and installation. For the calibration of the displacement meter in the working state, there is currently a lack of simple and effective calibration devices.

Contents of the invention

Based on the above problems, the present invention proposes a fast calibration frame for a pull-wire displacement meter, and its technical solution is:

Pull wire type displacement meter quick calibration frame, which includes base 1, positioning holes 4 at equal intervals, pull column 5, stopper 2 for fixing displacement meter, screw hole 3 for fixing displacement meter 8 and displacement meter fixing screw 7 , the base 1 is provided with positioning holes 4 at equal intervals, the base 1 is provided with a raised stopper 2 for fixing the displacement meter on one side of the positioning hole 4, and a screw hole is opened on the same side of the base away from the positioning hole 4 3. The screw hole 3 is provided with a displacement meter fixing screw 7 for pushing the displacement meter 8 on the stopper 2, and the displacement meter 8 is fixed through the raised stopper 2 on the base 1 and the screw rod 7 installed in the screw hole 3. It is fixed on the base 1; it also includes a pull column 5 inserted in the positioning hole 4 for connecting with the displacement gauge backguy 6, and the stretching length of the displacement gauge backguy 6 is adjusted by the pull column 5 installed in the positioning hole 4 to Produces a displacement that determines the difference.

There is a small hole at the upper end of the stay column 5, and a draw hook for the passage of the displacement gauge stay wire 6 passes through the hole.

The diameter of the pull post 5 is the same as the inner diameter of the positioning hole 4 , so that the pull post 5 can be inserted into the positioning hole 4 without gap.

The stay column 5 can move up and down in the positioning hole 4 to ensure that the stay wire 6 of the displacement gauge is horizontal.

The positioning holes 4 are arranged in straight lines with equal intervals.

Due to the adoption of the above-mentioned technical scheme, the present invention has the following advantages: the distance between the positioning holes is a known amount when the present invention is in use, and the extension of the fixed length of the stay wire of the displacement meter is realized by using the movement of the stays between the equidistant positioning holes. Or retracted, can realize quick on-site calibration of the pull-wire displacement gauge without using other high-precision measuring tools (such as vernier calipers, etc.), and has a simple structure, convenient use, and low manufacturing cost.

Description of drawings

Fig. 1 is a side view of the present invention;

Fig. 2 is the top view of the present invention;

Fig. 3 is a perspective view of a three-dimensional structure of the present invention.

In the figure 1. Base, 2. Block, 3. Screw hole, 4. Positioning hole, 5. Pull column, 6. Displacement gauge stay wire, 7. Screw, 8. Pull wire displacement gauge

Detailed ways

Implementation of the present invention will be further described below in conjunction with accompanying drawing:

As shown in Figure 1 and Figure 2, the fast calibration frame of the pull-wire displacement meter consists of a base 1, a raised stopper 2 on the base, a screw hole 3 on the side away from the positioning hole on the base, and equidistant positioning holes 4 in a straight line on the base. , the stay 5 that can be inserted into the positioning hole without clearance is formed by a screw rod 7 with a certain length.

The base 1 can be machined with low carbon steel plate, stainless steel plate, aluminum alloy, etc., and the length needs to be greater than the working range of the pull-wire displacement gauge (generally within 600mm), and its width should be slightly wider than the width of the pull-wire displacement gauge 8 , the height of the stopper 2 is within 5mm, the clear space between the stopper 2 and the screw hole 3 should ensure that the pull-wire displacement gauge 8 can be placed therein, the diameter of the positioning hole 4 is generally 2-4mm, and the spacing is based on the range of the pull-wire displacement gauge Take 10mm to 50mm, the positioning holes 4 should be arranged at equal intervals along the length of the base. There is a small hole at the upper end of the pull column 5, and a pull hook for the displacement gauge pull wire 6 to pass through the hole, or a sewing needle with a hole at one end can also be used Instead, short steel columns of different lengths can also be machined for use. Displacement meter backguy 6 can be fixed on the stay post 5 by the drag hook that thin iron wire does.

The working principle of the quick calibration stand for the pull-wire displacement meter is as follows:

When calibrating the pull-wire displacement gauge, first place the pull-wire displacement gauge between the stopper and the screw hole, press the tail of the displacement gauge by rotating the screw to fix it, and connect the power supply of the displacement gauge and the measurement data line, then connect the free end of the displacement meter cable to the pull column and insert the pull column into the positioning hole at a suitable position, use a multimeter or data acquisition equipment to measure the output voltage u ₁ of the pull wire displacement meter, and then move the pull column to another A positioning hole, according to the distance between the positioning holes, it can be known that the extension of the displacement meter cable is Δ, and then the output voltage of the displacement meter is measured again as u ₂ , and the sensitivity coefficient between the output voltage and the displacement feedback value is k=Δ according to the proportional relationship /(u ₂ -u ₁ ). Measurement through multiple positioning holes can calibrate the linearity of the displacement meter in the entire range, and the sensitivity correction coefficient and zero offset value can be easily obtained when the displacement reading value is measured by the data acquisition device.

Claims (5)

1. Pull wire type displacement meter quick calibration stand, including base (1), positioning holes at equal intervals (4), pull column (5), stopper for fixing displacement meter (2), and fixing displacement meter (8 ) screw hole (3) and displacement meter fixing screw (7), it is characterized in that: there are positioning holes (4) at equal intervals on the base (1), and the base (1) is set on one side of the positioning hole (4) There is a raised stopper (2) for fixing the displacement meter, and a screw hole (3) is opened on the same side of the base away from the positioning hole (4). The displacement gauge fixing screw (7) supported on the stopper (2), the displacement gauge (8 ) is fixed on the base (1); it also includes a pull post (5) inserted in the positioning hole (4) for connecting with the displacement gauge stay wire (6), through the stay post installed in the positioning hole (4) (5) Adjust the protruding length of the displacement gauge stay wire (6) to produce a displacement that determines the difference. 2. The fast calibration stand for the stay-wire type displacement meter according to claim (1), characterized in that: there is a small hole at the upper end of the stay column (5), and a hole for the stay wire (6) of the displacement meter passes through the hole. over the pull hook. 3. The fast calibration stand for the stay-wire displacement meter according to claim (1), characterized in that: the diameter of the pull column (5) is the same as the inner diameter of the positioning hole (4), so that the pull column (5) Insert it into the positioning hole (4) without play. 4. The quick calibration stand for the stay-wire displacement gauge according to claim (1), characterized in that: the stay column (5) can move up and down in the positioning hole (4) to ensure that the stay wire (6) of the displacement gauge at level. 5. The fast calibration stand for the wire-type displacement meter according to claim (1), characterized in that: the positioning holes (4) are arranged in a straight line at equal intervals.

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