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Manufacturing technology for large-scale high stability of drawstring displaceme

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Manufacturing technology for large-scale high stability of drawstring displaceme

Release date:2018-08-30 Click:

The rope displacement sensor is a new type of sensing device that converts physical quantities into measurable electrical signals. These can be easily applied to industrial control signals such as 4-20MA.0-10V MODBUS RS485. Before these international standard signals are used, some physical quantities need to be equally proportional to the acquisition and conversion, amplification, and a variety of environmentally acceptable quantities are required to be realized by such a precision instrument, so the rope displacement sensor is given This mission.

 

The main core components of the rope displacement sensor are divided into circuit converters and mechanical converters。 The electronic part of the circuit is mainly a 0-10V voltage regulator。 When the unstable power supply with harmonic interference components is regulated, after filtering, The high-precision voltage signal is applied to the voltage divider, and the voltage proportional signal corresponding to the change of the displacement amount is conveniently supplied to the voltage divider, and the output and processing of the current signal are based on the stable voltage signal。 The signal that has been accurately quantified by the potentiometer is converted into an industrial standard 4-20MA current signal by means of a sampling resistor。 If you need to output 4-20MA signal, the sampling resistance is 5K when the voltage is 2-10V。

For signal processing in a fairly complex industrial environment, it is also very important to do anti-jamming measures. In terms of pulse spike suppression and power supply harmonic suppression, appropriate magnetic ring and filter capacitors form differential mode and common mode anti-interference circuit. .

In the case of applying small displacement measurement, such as the stroke of the injection mold opening and closing mold, the position preset and feedback of the molding machine, it is enough to require a smaller displacement range of 50-1250MM, when a larger displacement is required. At the time of detection, such as the displacement change of the marsh airbag, the dam water level, the ship steering, and the storage positioning. Container terminals, etc., need to use a large range of displacement detection, and the space and weight applied to the measurement are limited to a certain space and volume. In this case, it is important to minimize the size and weight of the sensor. In terms of weight reduction, we can use a relatively light high-strength aluminum alloy material as the sensor's overall structure, which not only ensures the rigidity of the rope displacement sensor, but also greatly reduces the weight. At the same time, this high-strength aluminum material passes through. Acid and corrosion resistant, suitable for field detection and monitoring.

深圳市米朗科技有限公司When it is necessary to reduce the volume, we use a convenient conversion method, so that when the displacement detection range is over a large range, it ensures a small installation size and operates in an ideal state.

The mechanical sensing device of the rope displacement sensor is realized by a retractable rope collecting device, that is, when the Teflon-coated steel wire rope is pulled out for measurement, the winding wheel releases the wire rope, at this time the spring Tightening, with elastic potential energy, if the pulling force is less than the resilience force, the spring will drive the reel to retract the wire rope. The most important point is that the most common problem of many similar products is When the spring retracts the wire rope, there will be a wire rope jam or a collapse line. The main reason is that in the case of using the tension speed, if the problem occurs, most products It is because the spring modulus of the selected spring is not up to standard, or the product's steel coefficient itself causes insufficient resilience, and the return speed is greater than the spring retraction speed, which will cause the cable.

Therefore, to reduce the volume to achieve a large range of measurements, the first thing to do is to reduce the diameter of the reel, so as to reduce the overall dimensions of the cable displacement sensor。

We know that the linear motion is converted into a circular motion and is related to the pi. The wire rope moves linearly when it moves together with the measured physical quantity. The wire rope wound around the reel drives the reel. The role of the reel is to wait for this time. The linear motion of the quantity is converted into a proportional circular motion, that is, the circumference is 2πR, and the linear motion is the longer the range, that is, the longer the circumference, the larger the radius of the reel, so that the volume increases proportionally, so this The method of reducing the radius of the reel is to increase the number of turns of the reel. To increase the number of turns, you can consider two aspects: 1; increase the gear ratio, 2 select multi-turn increment or absolute encoder

Such as: 1 to achieve a large-scale measurement of 80 meters, the choice of gears with a gear ratio of 8:1, such as the choice of analog output potentiometer 10 lap calculation method: 80 meters / 10 = 8 meters. 8000MM/8=1000MM 1000/3.1415926=318.3098MM. That is, the 80-meter drawstring displacement sensor can reduce the volume relatively as long as the length and width of 350MM*360MM are achieved.

For the collapse line of the cable displacement sensor, the data will be abruptly changed, which will suddenly cause abnormal operation of the device. Lightly affects normal measurement and control and production, but also causes safety hazards, detection system disorder and data loss.

The solution to such problems depends on whether there is a good cable arranging mechanism inside the cable displacement sensor. Efficient lubrication of the wire wheel, automatic line in the plane of the reel, such as the number of rows of guide wheels is not enough or the guide wire of the wire guide wheel is not smooth, the walking is not smooth, resulting in the cable can not be timely In order, the superposition of the wire ropes causes overlap of the wires to increase the diameter of the reel. Causes a sudden change in the frequency of electrical signal acquisition and causes sensor detection problems. Therefore, the high-quality wire wheel running on the wire wheel column is an absolute guarantee for eliminating the accident of collapse.

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