Opening degree detection device and method of arc-shaped gate

Abstract

The invention discloses an opening degree detection device and method of an arc-shaped gate. The device comprises a controller and an angle detection device. The input end of the controller is connected with the angle detection device which is used for detecting the rotating angle when the arc-shaped gate is opened and transmitting the rotating angle to the controller. The angle detection device is arranged on the gate. The gate comprises a supporting hinge, a supporting arm and an arc-shaped door page. One end of the supporting arm is hinged to the supporting hinge, and the arc-shaped door page is arranged at the other end of the supporting arm. The opening degree detection device of the arc-shaped gate is provided, the rotating angle of the gate is detected through a sensor when the gate is opened, and therefore the opening degree of the arc-shaped gate can be obtained.

Description

technical field [0001] The invention relates to the field of gate opening detection, in particular to an arc gate opening detection device and method. Background technique [0002] The most widely used methods for measuring the opening of arc gates are the following technical solutions: [0003] 1. For the hydraulic arc gate, the displacement of the hydraulic cylinder piston that drives the gate to open and close is measured by the pull-rope displacement sensor, and the opening of the arc gate is indirectly converted through the piston displacement. The sensor body is installed on the cylinder body of the hydraulic cylinder of the arc gate, and a thin wire rope is pulled out from the sensor. , the wire rope is also pulled out and retracted. The wire rope is pulled out by the piston, and retracted by the elastic force of the scroll spring inside the sensor. This principle is somewhat similar to the steel tape measure that we use every day that can be retracted automatically....

AI Technical Summary

Problems solved by technology

Although this technology is widely used, its shortcomings are obvious, mainly in: 1) In the rainstorm and flood season, the water level upstream of the gate is relatively high, and various floating objects such as branches, roots, and weeds gather on the upstream edge of the gate. Under the action of the gate, it often turns over the gate and directly hits the steel wire rope of the sensor below, causing the wire rope to be broken and causing the opening measurement to fail. Suspension on the wire rope will cause additional disturbance to the wire rope, which will cause a huge deviation in the opening measurement; 2) The wire rope will be wound on the hub in an orderly manner during the retraction process, and sometimes overlapping will occur, which will cause large measurement deviation

3) The scroll spring inside the sensor may rust or fail mechanically after a long time, which will cause the wire rope not to be well tightened or retracted normally, or even broken by the cylinder piston

4) Since the sensor is installed outdoors, if the waterproof is not done well, in heavy rain weather, rainwater can easily enter the encoder through the shaft of the encoder in the sensor and cause the encoder to be damaged

5) The displacement of the piston and the opening of the gate are not a simple mathematical relationship, but a relatively complex functional relationship. The calculation of this function involves many mechanical dimensions and installation position data of the gate itself. In actual field application, especially for later equipment These data are often difficult to obtain accurately, which brings many difficulties to the calculation of the arc door opening. In order to overcome this problem, in practical applications, the method of multi-point sampling linear approximation of the opening is mostly used to fit the actual opening. The function curve calculates the opening, but this will not only cause a large calculation error, but also the debugging and calibration is very troublesome. Generally, at least 10 opening points need to be sampled, and each sampling point needs to use other methods to measure the actual opening. As the basic data for opening calibration, it is also necessary to ensure a certain measurement accuracy

Although this solution does not have some of the disadvantages of the above-mentioned rope-type displacement sensor, it also has its own disadvantages: 1) Since the displacement sensor is built-in, this requires the displacement sensor to be installed inside the cylinder before the cylinder leaves the factory. Once the displacement sensor fails, it will be extremely difficult to repair or replace. Sometimes it is even necessary to remove the entire cylinder and return it to the factory for repair, and the repair period is long and expensive.

2) The displacement of the piston and the opening of the gate are not a simple mathematical relationship, but a relatively complex functional relationship. The calculation of this function involves many mechanical dimensions and installation position data of the gate itself. In actual field applications, especially for later equipment These data are often difficult to obtain accurately, which brings many difficulties to the calculation of the arc door opening. In order to overcome this problem, in practical applications, the method of multi-point sampling linear approximation of the opening is mostly used to fit the actual opening. The function curve calculates the opening, but this will not only cause a large calculation error, but also the debugging and calibration is very troublesome. Generally, at least 10 opening points need to be sampled, and each sampling point needs to use other methods to measure the actual opening. As the basic data for opening calibration, it is also necessary to ensure a certain measurement accuracy

[0005] 3. For the opening measurement of the hoisting arc gate, the common solution is to install an absolute encoder concentrically with the end face of the reel, and measure the angular displacement and angular displacement signal of the reel through the absolute encoder. Generally through RS422 interface (SSI protocol), RS485 interface (Modbus, Profibus and other protocols), 4-20mA current loop, etc. to transmit to the PLC or opening detection instrument in the corresponding arc door electrical control cabinet, the angular displacement of the drum is transformed through linear transformation Calculate the linear displacement of the hoisting steel wire rope, and then convert the linear displacement of the steel wire rope to the gate opening. Since the linear displacement of the steel wire rope and the gate opening are also not a simple mathematical relationship, it is a relatively complicated functional relationship. The calculation of this function involves The mechanical dimensions and installation position data of many gates themselves are often difficult to obtain accurately in field practical applications, especially for the opening measurement devices equipped later, which brings many difficulties to the calculation of the arc gate opening. In order to overcome this The problem is that in practical applications, the method of multi-point sampling linear approximation of the opening is usually used to fit the actual opening function curve to calculate the opening, but this will not only cause a large calculation error, but also very troublesome to debug and calibrate. Generally, at least 10 samples are required. For more than three opening points, each sampling point needs to use other methods to measure the actual opening once, as the basic data for opening calibration also needs to ensure a certain measurement accuracy

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