A kind of tear detection technology suitable for conveying metal mineral belt conveyor

Abstract

The application discloses a kind of tearing detection technology suitable for conveying metal mineral rubber belt machine, belong to the field of rubber belt machine detection.It includes 555 time base integrated IC, detection grid, resistance R1, light emitting diode D1, triode Q1 and relay KJ;Detection grid is installed on the carrier roller support between the working face of rubber belt machine and return, and is connected with the 2 feet of 555 time base integrated IC;When the rubber belt machine is torn and causes metal mineral to fall into detection grid, since the resistivity value of metal mineral is lower than 1Ω·m, the 2 feet level of 555 time base integrated IC is pulled down, the 3 feet output high level, light emitting diode D1 is bright, triode Q1 is turned on, and the coil of relay KJ is electrified and attracted, and the normally open auxiliary contact is attracted to output tearing alarm signal;The whole circuit uses 12V direct current power supply.The application has the characteristics of action sensitive, reliable, safe and low cost.

Description

Technical Field

[0001] This invention relates to the inspection of conveyor belts, and more particularly to a tear detection technology suitable for conveyor belts transporting metal ores. Background Technology

[0002] Currently, most companies use pull-cord type tear protection for tape machines. This type of protection has a simple principle and low maintenance cost, but its disadvantage is that its action relies on mechanical physical contact, resulting in poor reliability.

[0003] In recent years, image analysis technology based on video analysis and laser scanning technology has also been applied to the tear protection of tape machines. This technology is also becoming more mature and can accurately determine the tear of the tape machine. The disadvantage is that the system is complex and requires the cooperation of software and hardware. The investment and maintenance costs are high, and there are also requirements for the use environment, so the actual application rate is not high. Summary of the Invention

[0004] Purpose of the Invention: The purpose of this invention is to provide a tear detection device suitable for conveyor belts transporting metal ores. This device employs electronic detection technology for control and features sensitive and reliable operation, as well as low investment and maintenance costs. It is applicable to conveyor belts transporting metal ores. The aim is to solve the problems of poor operational reliability or complex systems and high costs in existing conveyor belt tear protection devices.

[0005] Technical Solution: A tear detection device suitable for conveyor belts conveying metal ores includes a 555 timer IC, a detection grid, a resistor R1, a light-emitting diode D1, a transistor Q1, and a relay KJ. Pin 1 of the 555 timer IC is grounded, pin 8 is connected to the positive power supply, and pins 6 and 7 are shorted and then connected to the positive power supply. The detection grid is installed on a roller support between the working surface and the return surface of the conveyor belt. One end of the detection grid is connected to pin 2 of the 555 timer IC, and the other end is grounded. The upper end of the resistor R1 is connected to the positive power supply, and the lower end is connected to pin 2 of the 555 timer IC and the detection grid. When a longitudinal tear occurs in the conveyor belt, causing metal ores to fall into the detection grid, the resistivity of the metal ores is less than 1 Ω·m. The level of pin 2 of the timer IC is pulled low, and the output of pin 3 of the 555 timer IC is high. The anode of the LED D1 is connected to pin 3 of the 555 timer IC. When pin 3 outputs a high level, the LED D1 lights up to indicate that material has been dropped. The base of the transistor Q1 is connected to the cathode of the LED D1, and the emitter is grounded. When the output of pin 3 of the 555 timer IC is high, the transistor Q1 is turned on. One end of the coil of the relay KJ is connected to the collector of the transistor Q1, and the other end is connected to the positive terminal of the power supply. When the transistor Q1 is turned on, the coil of the relay KJ is energized and closes, and the normally open auxiliary contact of the relay KJ closes to output a tape tear alarm signal. The entire circuit is powered by 12V DC.

[0006] Furthermore, the detection grid is made of φ5mm corrosion-resistant stainless steel round bar.

[0007] Furthermore, the horizontal bar spacing of the detection grid is 3mm.

[0008] Furthermore, the size of the detection grid is appropriate to the width of the conveyor belt, and it is installed laterally to the conveyor belt.

[0009] Furthermore, the detection grid is installed 4-6 meters behind the feed inlet of the conveyor belt.

[0010] Furthermore, for long belts, the aforementioned detection grid is installed in the middle and at the tail of the belt conveyor.

[0011] Furthermore, the resistance of the resistor R1 is 2MΩ.

[0012] Furthermore, the transistor Q1 is model C9014.

[0013] This invention also provides a tear detection method suitable for conveyor belts conveying metal ores. Using the aforementioned tear detection device, the method includes the following steps: A detection grid is installed on the idler roller support between the working surface and the return path of the conveyor belt. The detection grid is connected to pin 2 of a 555 timer IC. When a longitudinal tear occurs in the conveyor belt, causing metal ores to fall into the detection grid, the resistivity of the metal ores is less than 1 Ω·m, resulting in good conductivity. Therefore, pin 2 of the 555 timer IC is pulled low. Pin 3 of the 555 timer IC outputs a high level, LED D1 illuminates to indicate material falling, and transistor Q1 conducts. The coil of relay KJ is energized and engages, and the normally open auxiliary contact of relay KJ engages to output a conveyor belt tear alarm signal.

[0014] Beneficial effects:

[0015] (1) This invention utilizes the characteristic that longitudinal tearing of the tape machine will cause material to fall off for detection. It utilizes the conductivity characteristic that the resistivity of metal minerals is less than 1Ω·m and uses a 555 timer IC to form a material falling detection circuit, which can accurately and reliably detect material falling off, thereby solving the problem of tear detection.

[0016] (2) This invention uses 12V DC power supply to ensure safety;

[0017] (3) The spacing of the horizontal bars of the detection grid in this invention is selected to be 3mm, which can effectively avoid the influence of dust and cause false alarms, while ensuring the reliability of the detection of falling ore;

[0018] (4) The material dropping detector of the present invention is simple to manufacture, has low cost, has no mechanical vibration parts, and has low maintenance load and maintenance cost;

[0019] (5) This invention has the advantages of being safe, simple, reliable and low cost. It can solve the problem of tear detection and protection of metal mineral conveyor belts, reduce huge losses caused by belt tearing, and provide a guarantee for the continuous and stable production of steel enterprises. Attached Figure Description

[0020] Figure 1 This is a circuit diagram of the tear detection device of the present invention. Detailed Implementation

[0021] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example

[0023] like Figure 1As shown, this invention discloses a tear detection device suitable for conveyor belts transporting metal ores. It mainly comprises a 555 timer IC and four external components: a resistor R1, a light-emitting diode D1, a transistor Q1, and a relay KJ, plus a detection grid. The detection grid is installed on a roller support between the working surface and the return surface of the conveyor belt.

[0024] Pin 1 of the 555 timer IC is grounded, pin 8 is connected to the positive power supply, and pins 6 and 7 are shorted and then connected to the positive power supply. Pin 2 of the 555 timer IC is the signal input terminal, connected to the detection grid and the lower end of resistor R1. The upper end of resistor R1 is connected to the positive power supply, and the lower end is connected to pin 2 of the 555 timer IC and the detection grid. The other end of the detection grid is grounded.

[0025] The working principle of this invention is as follows: When a mineral falls into the detection grid due to a tear in the conveyor belt, the resistivity of the metallic mineral is low (<1Ω·m), resulting in good conductivity. This pulls the voltage level of pin 2 of the 555 timer IC low, causing pin 3 to output a high level. LED D1 illuminates to indicate material falling, transistor Q1 conducts, the relay KJ coil is energized, and the normally open auxiliary contact of the relay closes, outputting a conveyor belt tear alarm signal. The entire circuit uses a 12V DC power supply to ensure its safety.

[0026] The detection grid can be made of corrosion-resistant stainless steel round bars with a diameter of approximately 5mm. To effectively avoid false alarms caused by dust and to ensure the reliability of ore detection, the spacing between the horizontal bars of the detection grid is selected to be 3mm. The size of the detection grid is suitable for the width of the conveyor belt and is installed transversely to the conveyor belt.

[0027] The detection grid should be installed 4-6 meters behind the feed inlet of the conveyor belt. For long belts, additional grids can be installed in the middle and at the end of the conveyor belt to enhance the protection of the conveyor belt.

[0028] The resistance of resistor R1 is 2MΩ, and the transistor Q1 is a C9014.

[0029] This material discharge detector is simple to manufacture, low in cost, has no mechanical vibration parts, and has low maintenance load and cost. Compared with other technologies, this technology has advantages such as safety, simplicity, reliability, and low cost. It can effectively solve the problem of tear detection and protection in metal mineral conveyor belts, reduce huge losses caused by belt tearing, and provide a guarantee for continuous and stable production in steel enterprises. It has great prospects for widespread application.

[0030] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A tear detection device suitable for conveyor belts transporting metal ores, characterized in that, The system includes a 555 timer IC, a detection grid, a resistor R1, an LED D1, a transistor Q1, and a relay KJ. Pin 1 of the 555 timer IC is grounded, pin 8 is connected to the positive power supply, and pins 6 and 7 are shorted and then connected to the positive power supply. The detection grid is mounted on a roller support between the working and return surfaces of the conveyor belt. One end of the detection grid is connected to pin 2 of the 555 timer IC, and the other end is grounded. The upper end of the resistor R1 is connected to the positive power supply, and the lower end is connected to pin 2 of the 555 timer IC and the detection grid. When a longitudinal tear occurs in the conveyor belt, causing metal ores to fall into the detection grid, the resistivity of the metal ores is less than 1 Ω·m, causing the voltage level at pin 2 of the 555 timer IC to be pulled up. The circuit operates at a low level, with pin 3 of the 555 timer IC outputting a high level. The anode of LED D1 is connected to pin 3 of the 555 timer IC; when pin 3 outputs a high level, LED D1 illuminates to indicate material loss. The base of transistor Q1 is connected to the cathode of LED D1, and its emitter is grounded; when pin 3 of the 555 timer IC outputs a high level, transistor Q1 conducts. One end of the coil of relay KJ is connected to the collector of transistor Q1, and the other end is connected to the positive terminal of the power supply. When transistor Q1 conducts, the coil of relay KJ is energized and engages, causing the normally open auxiliary contact of relay KJ to close and output a tape tear alarm signal. The entire circuit is powered by 12V DC.

2. The tear detection device for conveyor belts used in conveying metal ores according to claim 1, characterized in that, The detection grid is made of φ5mm corrosion-resistant stainless steel round bar.

3. The tear detection device for conveyor belts used in conveying metal ores according to claim 1, characterized in that, The horizontal bar spacing of the detection grid is 3mm.

4. The tear detection device for conveyor belts used in conveying metal ores according to claim 1, characterized in that, The size of the detection grid is appropriate to the width of the conveyor belt and is installed laterally to the conveyor belt.

5. The tear detection device for conveyor belts used in conveying metal ores according to claim 1, characterized in that, The detection grid is installed 4-6 meters behind the feed inlet of the conveyor belt.

6. The tear detection device for conveyor belts used in conveying metal ores according to claim 1, characterized in that, For long belts, the aforementioned detection grid is installed in the middle and at the tail of the belt conveyor.

7. The tear detection device for conveyor belts used in conveying metal ores according to claim 1, characterized in that, The resistance of resistor R1 is 2MΩ.

8. The tear detection device for conveyor belts used in conveying metal ores according to claim 1, characterized in that, The transistor Q1 is model C9014.

9. A tear detection method suitable for conveyor belts transporting metal ores, employing the tear detection device as described in claim 1, characterized in that, Includes the following steps: A detection grid is installed on the idler bracket between the working surface and the return path of the conveyor belt, and the detection grid is connected to pin 2 of the 555 timer IC. When a longitudinal tear occurs in the conveyor belt, causing a metal mineral to fall into the detection grid, the resistivity of the metal mineral is less than 1 Ω·m, resulting in good conductivity. Therefore, pin 2 of the 555 timer IC is pulled low; pin 3 of the 555 timer IC outputs a high level, LED D1 lights up to indicate material falling, and transistor Q1 conducts; the relay KJ coil is energized and engages, and the normally open auxiliary contact of the relay KJ engages to output a conveyor belt tear alarm signal.

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