CN112124902A

CN112124902A - Method for detecting slippage of belt of feeding machine

Info

Publication number: CN112124902A
Application number: CN202011041667.8A
Authority: CN
Inventors: 刘催; 张伟; 童胜云; 徐西川; 王文良; 李建超; 连武学
Original assignee: Handan Iron and Steel Group Co Ltd; HBIS Co Ltd Handan Branch
Current assignee: Handan Iron and Steel Group Co Ltd; HBIS Group Hansteel Co; HBIS Co Ltd Handan Branch
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2020-12-25

Abstract

The invention relates to a method for detecting the slippage of a belt of a feeder, belonging to the technical field of metallurgy. The technical scheme of the invention is as follows: the time from the detection of the first stop iron to the detection of the second stop iron by the proximity switch in a period of the operation of the belt transmission roller is measured on site to be t and is used as the time of a PLC program timer; the pulse number of the proximity switch is detected through a PLC program, whether the belt running at low speed slips or not is finally detected according to the power on and power off of the coils of each data block, and an alarm is output. The invention has the beneficial effects that: the problem of whether can effectual detection batcher belt skids prevents the malignant accident that the belt skidded and arouses, avoids the enlargement of accident, reduces the waste of manpower and material resources, and the operation is reliable and stable, and convenient to use, device are with low costs, have apparent economic benefits.

Description

Method for detecting slippage of belt of feeding machine

Technical Field

The invention relates to a method for detecting the slippage of a belt of a feeder, belonging to the technical field of metallurgy.

Background

The feeder is a material quantity-limiting unloading conveyor which is widely used in the ferrous metallurgy industry and mainly bears the unloading and conveying of bulk materials. Particularly in a raw material yard equipment system, a feeder is an indispensable conveying device, is generally a facility for controlling the material quantity, and is mainly used on an automobile discharge chute, a tipper receiving chute and a disc feeder belt; because of the environmental protection requirement, the material on the batcher belt of link of unloading is beaten water and is pressed down dirt, perhaps is connecing the in-process of unloading the supplied material, material itself contains moisture greatly, and under other abnormal conditions, cause the belt to skid easily, and the batcher does not all have the facility of preventing skidding in the design, and the main problem concentrates on not having the complete set device that is fit for the batcher and prevents skidding in the existing market, because batcher speed is very slow, belt drive cylinder still can not go to 4 rings in one minute, complete set device that skids in the market is unable measuring at present under this kind of speed.

Therefore, when the belt and the roller of the feeding machine slip, how to prevent the friction between the belt and the roller from further damaging the belt and the roller and even the occurrence of belt fire accidents becomes a technical problem to be solved by the technology in the field.

Disclosure of Invention

The invention aims to provide a method for detecting the slippage of a feeder belt, which can effectively detect the slippage problem of the feeder belt by using a proximity switch to sense a stop iron and locally modify a program, prevent a malignant accident caused by the slippage of the belt, avoid the enlargement of the accident, reduce the waste of manpower and material resources, has simple structure and easily understood detection method program, can complete the reconstruction under the condition that an original circuit is not moved, has accurate fault alarm signals, small signal interference, stable and reliable operation, convenient use and low device cost, has obvious economic benefit and effectively solves the problems existing in the background technology.

The technical scheme of the invention is as follows: a method for detecting the belt slippage of a feeder comprises the following steps: (1) a proximity switch is welded on a belt conveyor bracket, and four equally-divided iron stop blocks are arranged on a belt transmission roller; (2) the belt transmission roller rotates for a circle to form a period, the time from the detection of a first stop iron to the detection of a second stop iron by a proximity switch in the period of the belt transmission roller running is measured in the field to be t, and the t is used as the time of a PLC program timer; (3) the pulse number of the proximity switch is detected through a PLC program, equal comparison and less comparison are carried out, whether the belt running at low speed slips or not is finally detected according to the power on and power off of the coils of each data block, and an alarm is output.

In the step (1), four identical stop iron blocks are welded on the inner edge of one end of a belt transmission roller which runs at a low speed, the four stop iron blocks are symmetrical in distance, namely, a round roller is divided into four parts, meanwhile, a strip line proximity switch is fixedly installed on a belt conveyor support, the strip line proximity switch is a main frequency non-contact proximity switch, and the four stop iron blocks which sense different positions of the roller when the roller runs are detected.

In the step (2), the strip line proximity switch senses a stop iron signal and directly serves as a digital quantity input signal of the PLC, the signal flashes on the PLC I/0 module once to indicate that the strip line proximity switch senses a stop iron, the I point of the strip line proximity switch input signal senses that the stop iron count is 1, and when the stop iron block is sensed for 2 times, the counter is reset to 0 by a writing program, so that circular detection is realized.

And (3) if the strip line proximity switch detects that the induction iron stop block is less than twice in the time t, the belt slip fault is alarmed and stopped, and the PLC module outputs an alarm through a digital quantity Q point.

The invention has the beneficial effects that: through utilizing a proximity switch to go to respond to a stop iron and local modification procedure, can effectually detect the problem that the batcher belt was whether skidded, prevent the malignant accident that the belt skidded and arouses, avoid the enlargement of accident, reduce the waste of manpower and material resources, simple structure, the procedure of detection method is also understandable, can accomplish this transformation under the motionless condition of former circuit, and the malfunction alerting signal is accurate moreover, signal interference is little, the operation is reliable and stable, high durability and convenient use, the device is with low costs, and has remarkable economic benefits.

Drawings

FIG. 1 is a block diagram of a pulse counting routine for detecting a stop according to the present invention;

FIG. 2 is a loop detection program segment diagram of the present invention;

FIG. 3 is a data type conversion program segment diagram of the present invention;

FIG. 4 is a block diagram of the present invention showing the number of times the stop is detected as compared to the number 2;

FIG. 5 is a diagram of a section of the output warning shutdown procedure of the present invention;

FIG. 6 is a schematic view of the installation of the detection device of the present invention.

Fig. 7 is a PLC operation flow chart.

In fig. 6, the reference numerals are: the belt support comprises a belt support 1, a roller shaft supporting seat 2, a belt 3, a roller 4, an induction stop iron 5 and a strip line proximity switch 6.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.

A method for detecting the belt slippage of a feeder comprises the following steps: (1) a proximity switch is welded on a belt conveyor bracket, and four equally-divided iron stop blocks are arranged on a belt transmission roller; (2) the belt transmission roller rotates for a circle to form a period, the time from the detection of a first stop iron to the detection of a second stop iron by a proximity switch in the period of the belt transmission roller running is measured in the field to be t, and the t is used as the time of a PLC program timer; (3) the pulse number of the proximity switch is detected through a PLC program, equal comparison and less comparison are carried out, whether the belt running at low speed slips or not is finally detected according to the power on and power off of the coils of each data block, and an alarm is output.

Taking the feeding machine of the tipper as an example, as shown in fig. 6, a wired proximity switch is installed on a belt bracket of the feeding machine, the wired proximity switch is led to an input module I23.3 of the PLC module through a cable to serve as a slip signal pulse, and a stop iron is respectively installed at the quartering part of the roller, when the belt runs, the proximity switch sequentially senses four stop irons on the roller and senses the stop irons for 1 time, at this time, the slip signal I23.3 of the PLC module flashes, and a counter C38 counts 1 time and stores the count into a data block db5.dbw42 as shown in fig. 1.

As shown in fig. 2, the program segment T7 is timed to run for 15 seconds, the 15 seconds being verified by the field personnel at the site that the proximity switch senses about the time from the first stop to the second stop mounted on the drum while the belt is running, i.e., the proximity switch senses at least 2 stops during the 15 second period, otherwise an alarm is output. The presence or absence of an action output of the data db.dbx50.1 in the block of fig. 4 affects the output of the data db5.dbx50.0, and then the block of fig. 5 is controlled by feedback.

As shown in fig. 3, WORD data types in the data block db5.dbw42 are converted to INT data types db5. dbw44.

As shown in fig. 4, if the data stored in db5.dbw44 is compared with the integer of 2, and equals to the integer 2, the comparison result db5.dbx50.1 is output, i.e. the proximity switch sensing stop is output at least 2 times; the comparison result is fed back to the program segment shown in fig. 2 to realize the loop detection function of the program segment shown in fig. 2, and the data db5.dbx50.1 is fed back to the counter C38 shown in fig. 1 as the condition for resetting the zero position, and when the coil db5.dbx50.1 is powered on, the counter C38 counts to 0 for recounting.

As shown in fig. 5, the coil of data db5.dbx50.0 shown in fig. 2 is powered on and outputs, which indicates that the proximity switch senses the stop for at least 2 times, and then the program execution is directly interrupted, which indicates that the belt roller is in normal operation, the belt does not slip, and the belt repeatedly runs; and if the coil loses power and outputs the data DB5.DBX50.0 in the program section of the figure 2, outputting a belt slip alarm, and displaying a fault record by a computer of the center console.

Claims

1. A method for detecting the belt slippage of a feeder is characterized by comprising the following steps: (1) a proximity switch is welded on a belt conveyor bracket, and four equally-divided iron stop blocks are arranged on a belt transmission roller; (2) the belt transmission roller rotates for a circle to form a period, the time from the detection of a first stop iron to the detection of a second stop iron by a proximity switch in the period of the belt transmission roller running is measured in the field to be t, and the t is used as the time of a PLC program timer; (3) the pulse number of the proximity switch is detected through a PLC program, equal comparison and less comparison are carried out, whether the belt running at low speed slips or not is finally detected according to the power on and power off of the coils of each data block, and an alarm is output.

2. A method of detecting slippage of a feeder belt according to claim 1, wherein: in the step (1), four identical stop iron blocks are welded on the inner edge of one end of a belt transmission roller which runs at a low speed, the four stop iron blocks are symmetrical in distance, namely, a round roller is divided into four parts, meanwhile, a strip line proximity switch is fixedly installed on a belt conveyor support, the strip line proximity switch is a main frequency non-contact proximity switch, and the four stop iron blocks which sense different positions of the roller when the roller runs are detected.

3. A method of detecting slippage of a feeder belt according to claim 1, wherein: in the step (2), the strip line proximity switch senses a stop iron signal and directly serves as a digital quantity input signal of the PLC, the signal flashes on the PLC I/0 module once to indicate that the strip line proximity switch senses a stop iron, the I point of the strip line proximity switch input signal senses that the stop iron count is 1, and when the stop iron block is sensed for 2 times, the counter is reset to 0 by a writing program, so that circular detection is realized.

4. A method of detecting slippage of a feeder belt according to claim 1, wherein: and (3) if the strip line proximity switch detects that the induction iron stop block is less than twice in the time t, the belt slip fault is alarmed and stopped, and the PLC module outputs an alarm through a digital quantity Q point.