A control system for a bar brake skirt

Abstract

The application discloses a kind of control systems of bar brake apron, it is related to automatic control technology.It includes, high position proximity switch, whether the position of apron is in high position is used to detect;If the apron is in high position, a high electrical signal is output;Low position proximity switch, whether the position of apron is in low position is used to detect;If the apron is in low position, a low electrical signal is output;Controller, the electrical signal that the high position proximity switch and low position proximity switch output is used to gather, the action of apron is controlled according to the electrical signal;And take a latch, the high potential signal of the high position proximity switch is used to set the latch operation;The initial signal of the periodic command of the apron is used to reset the latch operation.The application guarantees brake apron normal continuous action, does not cause apron next time inaction due to high signal loss, guarantees the stable order of production, effect is remarkable.

Description

TECHNICAL FIELD

[0001] The present application relates to the automatic control technology, more particularly, it relates to a kind of control system of bar brake apron. BACKGROUND

[0002] Bar brake apron control is generally driven by hydraulic system to drive the lifting movement of apron, and the high position and low position of apron are detected by high position proximity switch and low position proximity switch respectively. The normal working process of apron is as follows: after apron receives action command, apron executes descending command from starting position high position. Apron starts to descend, and when low position proximity switch detects signal, it is considered that apron has descended to low position, at this time, descending command of apron is cancelled, and ascending command of apron is executed, and apron starts to ascend. When high position proximity switch detects signal, it is considered that apron has ascended to high position, at this time, ascending command of apron is cancelled, and apron stays in high position, waiting for next action command. Such periodic action is repeated.

[0003] When apron receives start command, only when apron is in high position, descending command can be executed, that is, high position proximity switch must have signal at this time, otherwise apron will not execute descending action. Apron inaction will cause production accidents such as steel stacking on apron and bed disorder, and production is forced to be interrupted, which causes serious economic loss. However, during normal production process, due to low pressure of hydraulic system or no signal of high position proximity switch, apron executes ascending action command, high position proximity switch of apron has no signal, or high position proximity switch has signal, but signal disappears after a while, which leads to apron not having condition for next action. Therefore, in order to better solve the problem of apron inaction caused by high position signal loss of bar brake apron, it is necessary to study a kind of control system of bar brake apron to solve the problem. SUMMARY

[0004] The present application aims to solve the technical problems of the prior art, and provides a kind of control system of bar brake apron, which solves the problem of apron inaction caused by high position signal loss of bar brake apron.

[0005] The control system of bar brake apron provided by the present application comprises,

[0006] high position proximity switch, for detecting whether the position of apron is in high position, if the position of apron is in high position, outputting a high position electrical signal;

[0007] low position proximity switch, for detecting whether the position of apron is in low position, if the position of apron is in low position, outputting a low position electrical signal;

[0008] The controller is used for collecting the electric signal outputted by the high-position proximity switch and the low-position proximity switch, controlling the action of the apron according to the electric signal, and taking a latch, setting the latch according to the transient high potential signal of the high-position proximity switch, and resetting the latch according to the periodic command initial signal of the apron.

[0009] The transient high potential signal of the high-position proximity switch is the rising edge of the high-position electric signal.

[0010] A lag time is set; when the high-position electric signal collected by the controller is the rising edge, the controller presets the latch; if the high-position electric signal keeps high potential within the lag time, the latch is set; if the high-position signal disappears within the lag time, the latch is not set.

[0011] After the latch is set through the lag time, the latch keeps the set state within the time period of the periodic command initial signal of the apron.

[0012] The lag time is 100-500 ms.

[0013] Beneficial effects

[0014] The apron is in the high position, even if the high-position proximity switch is affected by the fault or external factors to cause the signal to disappear, the controller will still judge that the apron is in the high position according to the set state in the latch, thereby solving the problem that the apron does not act due to the occasional absence of signal of the high-position proximity switch caused by external reasons of the bar apron, ensuring the normal and continuous action of the braking apron, and preventing the apron from not acting next time due to the absence of high-position signal, thereby ensuring the stable production and remarkable effect. Specific embodiments

[0015] The application is further described below in combination with embodiments, but does not constitute any limitation to the application, and any limited modification made by anyone within the scope of the claims of the application is still within the scope of the claims of the application.

[0016] The control system of the rod brake apron comprises a high-position proximity switch, a low-position proximity switch and a controller. The high-position proximity switch is used to detect whether the position of the apron is in the high position, and outputs a high-position electric signal if the apron is in the high position. The low-position proximity switch is used to detect whether the position of the apron is in the low position, and outputs a low-position electric signal if the apron is in the low position. The controller is used to collect the electric signals output by the high-position proximity switch and the low-position proximity switch, and control the action of the apron according to the electric signals. Specifically, after the apron receives the action command sent by the controller, the apron executes the descending command from the starting position, i.e. the high position, and starts to descend. When the controller detects the electric signal of the low-position proximity switch, it is considered that the apron has descended to the low position, at which time the descending command of the apron is cancelled, the ascending command of the apron is executed, and the apron starts to ascend. When the controller detects the electric signal of the high-position proximity switch, it is considered that the apron has ascended to the high position, at which time the ascending command of the apron is cancelled, the apron stays in the high position, and waits for the next action command.

[0017] In order to ensure that the controller can always correctly judge that the apron is in the high position without being affected by the high-position proximity switch when the apron is in the high position, a latch is taken in the controller, and the latch is set according to the transient high potential signal of the high-position proximity switch, and the latch is reset according to the periodic command initial signal of the apron.

[0018] Specifically, the transient high potential signal of the high-position proximity switch is the rising edge of the high-position electric signal. That is, when the controller detects the rising edge of the high-position electric signal, the latch is set. When the controller sends the next action command of the apron, the latch is reset. Through the simulation of the high-position electric signal by the latch, even if the signal of the high-position proximity switch disappears due to failure or external factors when the apron is in the high position, the controller will still judge that the high-position signal of the apron is 1, i.e. the apron is in the high position, according to the set state of the latch, thereby solving the problem that the apron does not act due to the occasional absence of the signal of the high-position proximity switch caused by external factors. The normal and continuous action of the brake apron is ensured, and the situation that the apron does not act next time due to the absence of the high-position signal is avoided, thereby ensuring the stability of production, and the effect is remarkable.

[0019] In order to avoid the problem that the latch is mis-set when the skirt board is not in the high position and the high position proximity switch is interfered by external factors to cause instantaneous signal mutation, the control system is provided with a lag time. The time can be set to 500 ms. When the high position electric signal collected by the controller is a rising edge, the controller performs a preset operation on the latch. If the high position electric signal remains high within the lag time, it is judged that the skirt board is in the high position, and the latch is set. If the high position signal disappears within the lag time, it is judged that the skirt board is not in the high position, the high position signal is caused by external interference, and the latch is not set, thereby improving the stability of the control system.

[0020] In addition, after the latch is set through the lag time, the latch always remains in the set state within the time period of the periodic command initial signal of the skirt board, so as to avoid the problem that the signal state of the latch changes after the high position signal disappears.

[0021] The above only describes the preferred embodiments of the present application, and it should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which will not affect the effect of the present application and the practicality of the patent.

Claims

1. A control system for a rod brake apron, comprising, a high position proximity switch for detecting whether the apron is in a high position; outputting a high position electrical signal if the apron is in the high position; a low position proximity switch for detecting whether the apron is in a low position; outputting a low position electrical signal if the apron is in the low position; characterized in that it further comprises, a controller for collecting the electrical signals outputted by the high position proximity switch and the low position proximity switch, and controlling the action of the apron according to the electrical signals; and taking a latch, setting the latch according to the transient high potential signal of the high position proximity switch; and resetting the latch according to the initial signal of the periodic command of the apron; the transient high potential signal of the high position proximity switch is the rising edge of the high position electrical signal; a lag time is set; when the rising edge of the high position electrical signal collected by the controller is detected, the controller presets the latch; if the high position electrical signal remains high within the lag time, the latch is set; if the high position electrical signal disappears within the lag time, the latch is not set.

2. A control system for a brake skirt of a rod according to claim 1, characterized in that after the latch is set through the lag time, the latch always remains set within the time period of the initial signal of the periodic command of the apron.

3. A control system for a brake skirt of a rod according to claim 1, characterized in that, the lag time is 100-500 ms.