Conveying method and device for avoiding damage to conveyor belts

Abstract

The application discloses a conveying method and device capable of avoiding belt damage of a conveyor, which comprises a main electromagnet arranged above a belt of a belt conveyor and in a constant power supply state, and used for adsorbing ferromagnetic sundries in materials conveyed by the belt conveyor; and an auxiliary electromagnet arranged around the main electromagnet and in a constant power-off state. Four infrared monitoring components are arranged on the belt conveyor and used for monitoring rod-shaped ferromagnetic sundries appearing in front, back, left and right directions around the main electromagnet. If the infrared monitoring component in a certain direction monitors the rod-shaped ferromagnetic sundries, a control signal is outputted, the auxiliary electromagnet corresponding to the control signal is connected to the power supply, and the rod-shaped ferromagnetic sundries are adsorbed on the auxiliary electromagnet, so that the belt is prevented from being punctured due to the fact that one end of the rod-shaped ferromagnetic sundries is adsorbed by the main electromagnet and the other end is inserted into the materials due to the belt movement. The application has the characteristics of good reliability and high safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of belt conveying, in particular to a conveying method and device capable of avoiding damage to the conveyor belt. BACKGROUND

[0002] Belt conveyors are widely used in the conveying of materials in the mining, quarrying, metallurgy, building materials, chemical industry, mineral processing, coal mining and other industries. During operation, ferromagnetic impurities in the materials need to be removed to ensure the safe and normal operation of mechanical equipment such as crushers and grinders in the conveying system. The usual way to automatically remove ferromagnetic impurities is to install a magnetic iron remover above the belt to remove them. However, in the process of simply using magnetic adsorption to remove ferromagnetic impurities, rod-shaped ferromagnetic impurities often pierce and damage the belt. The main problem is that rod-shaped ferromagnetic impurities are irregularly distributed on the belt. When the iron remover adsorbs rod-shaped ferromagnetic impurities, one end is often adsorbed by the iron remover, while the other end is still on the belt. Due to the relative movement of the belt and the iron remover, the belt is often pierced by rod-shaped ferromagnetic impurities, and sometimes the belt is also jammed in other parts of the conveyor, causing further damage to the equipment.

[0003] The application with the application number CN201921959464.X and the name "a new mine electromagnetic iron remover capable of automatic unloading" adds a telescopic and sliding device to make the electromagnetic iron remover movable, and adds an electromagnetic control device. The electromagnetic iron remover can be operated by one key, and the iron remover can be unloaded during the operation of the rubber belt, reducing the time of stopping the rubber belt conveyor when unloading the iron remover. However, it cannot accurately remove rod-shaped ferromagnetic impurities, and there is still a risk of rod-shaped ferromagnetic impurities piercing the belt. SUMMARY

[0004] The present application is used to overcome the defects of the prior art and provide a conveying method and device capable of avoiding damage to the conveyor belt. The belt conveyor can avoid the problem of belt damage caused by ferromagnetic impurities, especially rod-shaped ferromagnetic impurities, during the conveying of materials.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A conveying method capable of avoiding damage to the conveyor belt, which comprises a main electromagnet arranged above the belt of the belt conveyor, the main electromagnet being used to attract ferromagnetic impurities in the material conveyed by the belt conveyor and being in a constant power supply state; an auxiliary electromagnet arranged around the main electromagnet, the auxiliary electromagnet being in a constant power-off state; and four infrared monitoring assemblies arranged on the belt conveyor and located at the front, back, left and right of the main electromagnet, respectively, for monitoring the appearance of rod-shaped ferromagnetic impurities in the four directions, if the infrared monitoring assembly in a certain direction detects a rod-shaped ferromagnetic impurity, a control signal is outputted to switch on the power supply of the auxiliary electromagnet corresponding to the infrared monitoring assembly, and the rod-shaped ferromagnetic impurity is attracted by the auxiliary electromagnet, so that one end of the rod-shaped ferromagnetic impurity is attracted by the main electromagnet and the other end is attracted by the auxiliary electromagnet, and the rod-shaped ferromagnetic impurity is separated from the belt, thereby avoiding the belt being punctured by the rod-shaped ferromagnetic impurity due to the fact that one end of the rod-shaped ferromagnetic impurity is attracted by the main electromagnet and the other end is inserted into the material due to the movement of the belt.

[0007] The conveying method capable of avoiding damage to the conveyor belt, the auxiliary electromagnet is in the shape of a sector, the center of the arc of the sector coincides with the center of the main electromagnet, and the distance between the inner arc of the sector and the circle of the main electromagnet is 10-20 cm.

[0008] The conveying method capable of avoiding damage to the conveyor belt, each infrared monitoring assembly is composed of an infrared emitting assembly and an infrared receiving assembly, the infrared emitting assembly is an infrared emitting tube matrix composed of a plurality of infrared emitting tubes, the infrared receiving assembly is a fiber-optic photoelectric converter, and the fiber-optic photoelectric converter also adopts a rectangular shape to match the infrared emitting tube matrix, the infrared light emitted by the infrared emitting tube matrix is irradiated onto the fiber disc of the fiber-optic photoelectric converter, and an electric signal is outputted to the control circuit through photoelectric conversion.

[0009] The conveying method capable of avoiding damage to the conveyor belt, a delay is added to the circuit for controlling the disconnection of the auxiliary electromagnet, and the auxiliary electromagnet is disconnected through a delay signal after the power supply of the auxiliary electromagnet is turned on and the work is completed, so as to prepare for the next attraction.

[0010] A conveying device capable of avoiding damage to the conveyor belt for use in the above method, which comprises a belt conveyor, a frame, an electromagnet assembly, an infrared monitoring assembly, a CPU, an alarm and a control circuit, the frame is hung on the slide rail and located directly above the belt conveyor, the electromagnet assembly is arranged below the frame, the infrared monitoring assembly is arranged on the support of the belt conveyor and composed of an infrared emitting assembly and an infrared receiving assembly, and the infrared line passes through above the belt during the operation of the infrared monitoring assembly, the signal output end of the infrared monitoring assembly is connected to the input end of the CPU, and the output end of the CPU is connected to each electromagnet in the electromagnet assembly through contactors.

[0011] The conveyor device capable of avoiding conveyor belt damage, the electromagnet assembly is composed of a main electromagnet arranged at the center and auxiliary electromagnets arranged around the main electromagnet; the auxiliary electromagnets include a first auxiliary electromagnet, a second auxiliary electromagnet, a third auxiliary electromagnet and a fourth auxiliary electromagnet; the auxiliary electromagnets are in the shape of a sector, the center of the arc of the sector coincides with the center of the main electromagnet; the distance between the inner arc of the sector and the circle of the main electromagnet is 10-20 cm, and the distance between each auxiliary electromagnet is 20-35 cm.

[0012] The conveyor device capable of avoiding conveyor belt damage, the infrared monitoring assembly is composed of four infrared assemblies, i.e., a first infrared assembly, a second infrared assembly, a third infrared assembly and a fourth infrared assembly; the first infrared assembly is composed of a first infrared emitter and a first infrared receiver, and the infrared beams emitted by the first infrared assembly pass below the first auxiliary electromagnet; the second infrared assembly, the third infrared assembly and the fourth infrared assembly have the same structure, and the infrared beams emitted by the second infrared assembly, the third infrared assembly and the fourth infrared assembly pass below the second auxiliary electromagnet, the third auxiliary electromagnet and the fourth auxiliary electromagnet respectively.

[0013] The conveyor device capable of avoiding conveyor belt damage, the first infrared emitter is composed of a plurality of infrared emitters, the plurality of infrared emitters form an infrared emitter matrix, the first infrared receiver is a fiber-optic photoelectric converter, and the fiber-optic photoelectric converter is composed of a light collecting shell, a fiber disc, a fiber, a convex lens and a first infrared receiver arranged in the light collecting shell; infrared light is irradiated onto the fiber disc, and then is emitted onto the convex lens through the fiber; the infrared emitter matrix adopts a rectangular shape, and the fiber-optic photoelectric converter also adopts a rectangular shape to match the infrared emitter matrix; the second infrared assembly, the third infrared assembly and the fourth infrared assembly have the same structure as the first infrared assembly.

[0014] The conveyor device capable of avoiding conveyor belt damage, the output signal of the first infrared receiver in the first infrared assembly is input into the signal input end P1.0 of the CPU through the first comparator, and the output signals of the second infrared assembly, the third infrared assembly and the fourth infrared assembly are input into other input ends of the CPU in the same way.

[0015] The conveyor device capable of avoiding conveyor belt damage, the P2.1 output end of the CPU is connected to the base of the first triode, and the collector or emitter of the first triode drives the first relay, so as to control the on-off of the first coil of the first auxiliary electromagnet; the other output ends of the CPU are connected to the coils of the second auxiliary electromagnet, the third auxiliary electromagnet, the fourth auxiliary electromagnet and the main electromagnet in the same way.

[0016] The conveyor device capable of avoiding conveyor belt damage has the following advantages:

[0017] Firstly, the conveying method adopted by the application sets a main electromagnet and multiple auxiliary electromagnets above the belt, and sets four infrared monitoring assemblies on the belt conveyor, under the control of the infrared emission mechanism and the control circuit, step-by-step adsorbs the rod-shaped ferromagnetic impurities on the belt conveyor, so that the rod-shaped ferromagnetic impurities can reliably separate from the belt, and the belt is avoided from being punctured and damaged.

[0018] Secondly, the infrared rays emitted by the four infrared monitoring assemblies are arranged vertically in pairs, and each infrared emission mechanism corresponds to an auxiliary electromagnet. When one end of the rod-shaped ferromagnetic impurities is adsorbed by the main magnet and the other end is on the belt, the rod-shaped ferromagnetic impurities will be in an inclined state, and will inevitably pass through the infrared rays emitted by a certain infrared monitoring assembly. According to the on-off state signal of the infrared rays, the CPU controls the corresponding auxiliary electromagnet to work and adsorb the other end of the rod-shaped ferromagnetic impurities.

[0019] Thirdly, the infrared emission assembly is composed of a matrix of multiple infrared emission tubes. The advantage of this structure is that when one end of the rod-shaped ferromagnetic impurities is adsorbed by the main magnet, the infrared light beam matrix emitted by the infrared emission tube matrix can detect the rod-shaped ferromagnetic impurities in all directions without dead angle. The infrared light irradiates the fiber disc of the infrared receiving assembly, is conducted by the optical fiber, is focused by the convex lens to the infrared receiving tube, the output signal of the infrared receiving tube is input to the signal input end of the CPU through the comparator, and the CPU controls the auxiliary magnet in the corresponding direction to start according to the change of the input signal, so as to reliably adsorb and remove the rod-shaped ferromagnetic impurities.

[0020] Fourthly, when the CPU controls the auxiliary electromagnet in the corresponding direction to work, in order to quickly and reliably adsorb the end of the rod-shaped ferromagnetic impurities, the auxiliary electromagnet is first controlled to move downward and approach the end of the rod-shaped ferromagnetic impurities, and the auxiliary electromagnet in the corresponding direction is powered on to adsorb the end of the rod-shaped ferromagnetic impurities. BRIEF DESCRIPTION OF DRAWINGS

[0021] The application will be further described in detail below with reference to the drawings.

[0022] Figure 1 is a schematic view of the conveying device structure of the application;

[0023] Figure 2 is a schematic view of the electromagnet assembly structure of the application;

[0024] Figure 3 is a schematic view of the control circuit of the application;

[0025] Figure 4 is a schematic view of the fiber-optic photoelectric converter structure of the application;

[0026] Figure 5 is a schematic view of the first infrared emission assembly of the application.

[0027] In the drawings, the various reference signs represent:

[0028] 1, frame, 2, electromagnet assembly, 2-1, main electromagnet, 2-21, auxiliary one magnet, 2-22, auxiliary two magnet, 2-23, auxiliary three magnet, 2-24, auxiliary four magnet, 3, infrared monitoring assembly, 3-1 first infrared assembly, 3-2, second infrared assembly, 3-3, third infrared assembly, 3-4, fourth infrared assembly, 3-1-1, first infrared emission assembly, 3-1-2, first infrared receiving assembly, 4, slide rail, 5, belt conveyor, 6, first drive motor, GD11-GD1n, first infrared emitter-nth infrared emitter, Q1-Q4, first infrared receiver-fourth infrared receiver, IC1, first comparator, T1-T5, first tetrode-fifth tetrode, J1-J5, first relay-fifth relay, DCT1-DCT5, first coil-fifth coil, R1-R5, first resistor-fifth resistor. DETAILED DESCRIPTION

[0029] The application will be further described in detail below with reference to the accompanying drawings and examples.

[0030] As Figures 1-5 shown, the application provides a conveying method and device which can avoid damage to the conveyor belt.

[0031] The conveying method used is as follows:

[0032] A main electromagnet 2-1 is arranged above the belt of the belt conveyor 5, and the main electromagnet 2-1 is used to adsorb ferromagnetic impurities in the material transported by the belt conveyor and is in a constant power supply state; auxiliary electromagnets are arranged around the main electromagnet 2-1, and the auxiliary electromagnets are in a constant power-off state. The auxiliary electromagnets are in the shape of a sector, and the number of the auxiliary electromagnets is four. The arc center of the sector coincides with the arc center of the main electromagnet 2-1. The distance between the inner arc of the sector and the main electromagnet 2-1 is 10-20 cm, and the distance between each auxiliary electromagnet is 20-35 cm. Here, the sector actually refers to a sector segment, which refers to two sectors with the same center, overlapping edges and different radii. The sector segment is surrounded by the two arc edges and two straight edges.

[0033] The infrared monitoring assembly 3 is arranged on the belt conveyor 5, and the number of the infrared monitoring assembly 3 is four, which is arranged at four positions of front, back, left and right of the main electromagnet 2-1, and is used for monitoring the rod-shaped ferromagnetic impurities 7 in the four directions. If the infrared monitoring assembly 3 in a direction monitors the rod-shaped ferromagnetic impurities 7, a control signal is outputted, the auxiliary electromagnet corresponding to the control signal is connected to the power supply, the rod-shaped ferromagnetic impurities 7 is adsorbed on the auxiliary electromagnet by the auxiliary electromagnet, so that one end of the rod-shaped ferromagnetic impurities 7 is adsorbed by the main electromagnet 2-1, and the other end is adsorbed by the auxiliary electromagnet, and the rod-shaped ferromagnetic impurities 7 is separated from the belt, so that the belt is not punctured by the rod-shaped ferromagnetic impurities 7.

[0034] Each infrared monitoring assembly 3 is composed of an infrared emitting assembly and an infrared receiving assembly. The infrared emitting assembly can be a single infrared emitting tube, a plurality of infrared emitting tubes arranged in a column or a matrix composed of a plurality of infrared emitting tubes. The corresponding infrared receiving assembly is a single infrared receiving tube, a plurality of infrared emitting tubes arranged in a column or a matrix composed of a plurality of infrared emitting tubes.

[0035] In order to more accurately detect the rod-shaped ferromagnetic impurities 7, the infrared emitting assembly is selected to be a matrix composed of a plurality of infrared emitting tubes, and the infrared receiving assembly is an optical fiber photoelectric converter. The optical fiber photoelectric converter also adopts a rectangular shape to match the infrared emitting tube matrix. The infrared light emitted by the infrared emitting tube matrix is irradiated to the optical fiber disc of the optical fiber photoelectric converter, and an electrical signal is outputted to the control circuit through photoelectric conversion.

[0036] When the auxiliary electromagnet completes the adsorption work, the rod-shaped ferromagnetic impurities 7 is changed from the state of being adsorbed at one end to the state of being adsorbed as a whole on the electromagnet assembly 2. At this time, the auxiliary electromagnet is disconnected, and the rod-shaped ferromagnetic impurities 7 can be reliably adsorbed by the main electromagnet 2-1. In order not to interfere with the next adsorption work and to consider the power consumption and the electromagnetic heat dissipation, the auxiliary electromagnet should be restored to the disconnected state. Therefore, a delay is added to the circuit for controlling the disconnection of the auxiliary electromagnet. After the auxiliary electromagnet is powered on and the work is completed, the auxiliary electromagnet is disconnected by the delay signal, and is prepared for the next adsorption.

[0037] The application uses infrared signal to control the on or off of the auxiliary electromagnet, so as to realize the purpose of smoothly removing the rod-shaped ferromagnetic impurities 7. The infrared signal control circuit comprises an infrared emitting component, an infrared receiving component, a signal processing circuit and an execution mechanism. The infrared emitting component and the infrared receiving component are installed below the main electromagnet 2-1 and above the belt conveyor, and are located in the surrounding space below the main electromagnet 2-1, and the centers of the two are located on the same center line. In this way, when one end of the rod-shaped ferromagnetic impurities 7 is attracted out of the material layer on the belt conveyor by the main electromagnet 2-1, and the other end is still inserted into the material layer on the belt conveyor, the rod-shaped ferromagnetic impurities 7 is detected by the infrared signal control circuit due to the shielding of the infrared light, and after the signal received by the infrared receiving tube is interrupted, the infrared signal of the first infrared component is taken as an example, a low level appears on the first resistor R1, the first comparator IC1 outputs a high level to the CPU, and then the CPU outputs a control signal to the corresponding execution circuit to make it act.

[0038] In the application, four sets of identical control circuits are arranged in the infrared signal control circuit, each of which comprises an infrared emitting component, an infrared receiving component, a signal processing circuit and an execution mechanism, and is used to detect the signals in the front, rear, left and right directions respectively. When the main electromagnet 2-1 attracts one end of the rod-shaped ferromagnetic impurities 7 from a certain direction of the material layer, and the other end is still buried in the material layer, at this time, the inclined rod-shaped ferromagnetic impurities 7 will interrupt the infrared signal in a certain direction, and the infrared receiving tube in this direction cannot receive the infrared signal, and the CPU outputs a corresponding control signal to the corresponding triode, the triode is turned on, the corresponding relay is powered on, the normally open contact is closed, and the auxiliary electromagnet in the corresponding direction is powered on, and the magnetic force of the auxiliary electromagnet lifts the rod-shaped ferromagnetic impurities 7, thereby avoiding the rod-shaped ferromagnetic impurities 7 from being inserted into the belt conveyor.

[0039] Generally, the rod-shaped ferromagnetic impurities 7 is inserted into the belt conveyor due to a coincidence. The application arranges the main electromagnet 2-1 and the auxiliary electromagnet, and in normal operation, the main electromagnet 2-1 is turned on, and only when the rod-shaped ferromagnetic impurities 7 is attracted and needs to be attracted by the auxiliary electromagnet, the auxiliary electromagnet in a certain direction is turned on. The electromagnetic attraction of the auxiliary electromagnet destroys this special condition, thereby avoiding the damage of the iron in the material to the belt conveyor.

[0040] The infrared receiving component of the application is a fiber-optic photoelectric converter. Taking the first infrared component as an example, the infrared light emitted by the first infrared emitting component irradiates on the fiber disc of the fiber-optic photoelectric converter, and then is emitted to the convex lens 3-1-24 in the light collecting shell. The convex lens 3-1-24 focuses the infrared light on the first infrared receiving tube Q1, and the first infrared receiving tube Q1 converts the infrared signal into an electric signal for subsequent control.

[0041] The conveyor belt damage prevention device is characterized in that the device comprises a belt conveyor, a frame, an electromagnet assembly, an infrared monitoring assembly, a CPU, an alarm and a control circuit.

[0042] The frame 1 is hung on the slide rail 4 and is located directly above the belt conveyor 5, and is driven by the first driving motor 6 to move along the slide rail 4. When the ferromagnetic impurities adsorbed on the electromagnet assembly 2 are too much, the electromagnet assembly 2 can be driven by the first driving motor 6 to move out of the belt to release and clean the ferromagnetic impurities. The electromagnet assembly 2 is arranged below the frame 1. The infrared monitoring assembly 3 is arranged on the support of the belt conveyor 5 and is composed of an infrared emitter and an infrared receiver. When the infrared monitoring assembly 3 works, the infrared rays pass through the belt above. The signal output end of the infrared monitoring assembly 3 is connected to the input end of the CPU, and the output end of the CPU is connected to each electromagnet in the electromagnet assembly 2 through a contactor.

[0043] The electromagnet assembly 2 is composed of a main electromagnet 2-1 arranged in the center and auxiliary electromagnets arranged around the main electromagnet 2-1. The auxiliary electromagnets include a first auxiliary electromagnet 2-21, a second auxiliary electromagnet 2-22, a third auxiliary electromagnet 2-23 and a fourth auxiliary electromagnet 2-24. The shape of the auxiliary electromagnets is fan-shaped, and the center of the arc edge of the fan-shaped arc is coincident with the center of the main electromagnet. The distance between the inner arc of the fan-shaped arc and the circle of the main electromagnet is 10-20 cm, and the distance between each auxiliary electromagnet is 20-35 cm.

[0044] The infrared monitoring assembly 3 is composed of four infrared assemblies, i.e. a first infrared assembly 3-1, a second infrared assembly 3-2, a third infrared assembly 3-3 and a fourth infrared assembly 3-4. The first infrared assembly 3-1 is composed of a first infrared emitter assembly 3-1-1 and a first infrared receiver assembly 3-1-2. The infrared beam emitted by the first infrared assembly 3-1 is perpendicular to the running direction of the belt and passes through the first auxiliary electromagnet 2-21 directly below. The second infrared assembly 3-2 has the same structure as the first infrared assembly 3-1. The infrared beam emitted by the second infrared assembly 3-2 is parallel to the infrared beam of the first infrared assembly 3-1 and passes through the second auxiliary electromagnet 2-22 directly below. The third infrared assembly 3-3 and the fourth infrared assembly 3-4 have the same structure as the first infrared assembly 3-1. The infrared beams emitted by the third infrared assembly 3-3 and the fourth infrared assembly 3-4 are perpendicular to the infrared beam of the first infrared assembly 3-1 and pass through the third auxiliary electromagnet 2-23 and the fourth auxiliary electromagnet 2-24 directly below, respectively.

[0045] The four infrared assemblies in the infrared monitoring assembly 3 correspond to the four auxiliary electromagnets, respectively. When the rod-shaped ferromagnetic impurities 7 block the infrared rays of a certain infrared assembly, the corresponding auxiliary electromagnet is powered on to assist in adsorbing the rod-shaped ferromagnetic impurities 7.

[0046] The first infrared emission component 3-1-1 is composed of a plurality of infrared emission tubes, which form an infrared emission tube matrix, and the first infrared receiving component 3-1-2 is a fiber-optic photoelectric converter, which is composed of a light collecting shell 3-1-21 and a fiber disc 3-1-22, a fiber 3-1-23, a convex lens 3-1-24 and a first infrared receiving tube Q1 arranged in the light collecting shell 3-1-21. Infrared light is irradiated onto the fiber disc 3-1-22 and then transmitted onto the convex lens 3-1-24 through the fiber 3-1-23. The infrared emission tube matrix adopts a rectangular shape, and the fiber-optic photoelectric converter also adopts a rectangular shape to match the infrared emission tube matrix. The second infrared component 3-2, the third infrared component 3-3 and the fourth infrared component 3-4 have the same structure as the first infrared component 3-1.

[0047] The infrared emission tube matrix adopts a rectangular shape, and the fiber-optic photoelectric converter also adopts a rectangular shape to match the infrared emission tube matrix. Eight to sixteen infrared emission tubes are arranged in each infrared emission tube matrix, and the infrared emission tubes are uniformly and spacedly arranged.

[0048] The output signal of the infrared receiving tube 3-1-24 in the first infrared component 3-1 is input to the signal input terminal P1.0 of the CPU through the first comparator IC1, and the output signals of the second infrared component 3-2, the third infrared component 3-3 and the fourth infrared component 3-4 are input to other input terminals of the CPU in the same way.

[0049] The P2.1 output terminal of the CPU is connected to the base of the first triode T1, and the collector or emitter of the first triode T1 drives the first relay J1, so as to control the on-off of the first coil DCT1 of the main electromagnet 2-1. The P2.2-P2.5 output terminals of the CPU are connected to the coils of the auxiliary one magnet 2-21, the auxiliary two magnet 2-22, the auxiliary three magnet 2-23 and the auxiliary four magnet 2-24 in the same way.

[0050] In order to make the adsorption effect of the auxiliary electromagnet more reliable, a vertical guide rail can be arranged below the frame 1. Each of the four auxiliary magnets is provided with a guide rail groove matched with the guide rail and connected to the frame 1 through four electric cylinders, so as to realize the up-down movement of the auxiliary magnets. The other output terminals of the CPU are connected to the motors of the four electric cylinders and the first driving motor 6 through relays.

Claims

1. A conveying method that avoids damage to the conveyor belt, characterized in that, The method involves setting a main electromagnet (2-1) above the belt of the belt conveyor (5). The main electromagnet (2-1) is used to attract ferromagnetic impurities in the materials transported by the belt conveyor and is in a normally powered state. An auxiliary electromagnet is set around the main electromagnet (2-1), and the auxiliary electromagnet is normally de-energized. At the same time, an infrared monitoring component (3) is set on the belt conveyor (5). There are four infrared monitoring components (3), which are located in the four directions of front, back, left, and right around the main electromagnet (2-1) to monitor the output of the main electromagnet (2-1) in the four directions of front, back, left, and right. If the infrared monitoring component (3) detects the rod-shaped ferromagnetic impurity (7) in a certain direction, it outputs a control signal to connect the power supply of the auxiliary electromagnet controlled by it. The auxiliary electromagnet will attract the rod-shaped ferromagnetic impurity (7) onto it, so that one end of the rod-shaped ferromagnetic impurity (7) is attracted by the main electromagnet (2-1) and the other end is attracted by the auxiliary electromagnet, so that it is removed from the belt. This avoids the belt being punctured because one end of the rod-shaped ferromagnetic impurity (7) is attracted by the main electromagnet (2-1) and the other end is inserted into the material due to the movement of the belt.

2. The conveying method for avoiding damage to the conveyor belt according to claim 1, characterized in that, The auxiliary electromagnet is fan-shaped, with the center of the arc edge of the fan coinciding with the center of the main electromagnet; the distance between the inner arc of the fan and the circle of the main electromagnet is 10-20 cm.

3. The conveying method for avoiding damage to the conveyor belt according to claim 2, characterized in that, Each infrared monitoring component (3) consists of an infrared emitting component and an infrared receiving component. The infrared emitting component is an infrared emitting tube matrix composed of multiple infrared emitting tubes. The infrared receiving component is a fiber optic photoelectric converter, which is also rectangular in shape to match it. The infrared light emitted by the infrared emitting tube matrix is ​​irradiated onto the fiber optic disk of the fiber optic photoelectric converter, and the output electrical signal is connected to the control circuit after photoelectric conversion.

4. The conveying method for avoiding damage to the conveyor belt according to claim 3, characterized in that, A delay is added to the circuit that controls the disconnection of the auxiliary electromagnet. After the auxiliary electromagnet is energized and completes its operation, the auxiliary electromagnet is disconnected after a delay signal to prepare for the next attraction.

5. A conveying device for implementing the method of claim 1, characterized in that, Includes belt conveyor (5), frame (1), electromagnet assembly (2), infrared monitoring assembly (3), CPU, alarm and control circuit; The frame (1) is suspended on the slide rail (4) and located directly above the belt conveyor (5); the electromagnet assembly (2) is located below the frame (1); The infrared monitoring component (3) is set on the support of the belt conveyor (5) and consists of an infrared emitting component and an infrared receiving component. When it is working, the infrared rays pass through the top of the belt. The signal output terminal of the infrared monitoring component (3) is connected to the input terminal of the CPU, and the output terminal of the CPU controls each electromagnet in the electromagnet component (2) through a contactor.

6. The conveying device according to claim 5, characterized in that, The electromagnet assembly (2) consists of a main electromagnet (2-1) located at the center and auxiliary electromagnets arranged around the main electromagnet (2-1); the auxiliary electromagnets include auxiliary magnet 1 (2-21), auxiliary magnet 2 (2-22), auxiliary magnet 3 (2-23) and auxiliary magnet 4 (2-24); the auxiliary electromagnets are fan-shaped, and the center of the arc edge of the fan coincides with the center of the main electromagnet; the distance between the inner arc of the fan and the circle of the main electromagnet is 10-20 cm, and the distance between each auxiliary electromagnet is 20-35 cm.

7. The conveying device according to claim 6, characterized in that, The number of infrared monitoring components (3) is 4, namely the first infrared component (3-1), the second infrared component (3-2), the third infrared component (3-3) and the fourth infrared component (3-4). The first infrared component (3-1) consists of a first infrared emitting component (3-1-1) and a first infrared receiving component (3-1-2), and its emitted infrared beam passes under the auxiliary magnet (2-21); the second infrared component (3-2), the third infrared component (3-3) and the fourth infrared component (3-4) have the same structure, and their emitted infrared beams pass under the auxiliary magnet (2-22), the auxiliary magnet (2-23) and the auxiliary magnet (2-24) respectively.

8. The conveying device according to claim 7, characterized in that, The first infrared emitting component (3-1-1) consists of multiple infrared emitting tubes forming an infrared emitting tube matrix. The first infrared receiving component (3-1-2) is a fiber optic photoelectric converter, consisting of a light-collecting shell (3-1-21) and a fiber optic disk (3-1-22), an optical fiber (3-1-23), a convex lens (3-1-24), and a first infrared receiving tube (Q1) disposed therein. Infrared light is irradiated onto the fiber optic disk (3-1-22) and then emitted through the optical fiber (3-1-23) onto the convex lens (3-1-24). The infrared emitting tube matrix adopts a rectangular shape, and the fiber optic photoelectric converter also adopts a rectangular shape to match it. The second infrared component (3-2), the third infrared component (3-3), and the fourth infrared component (3-4) have the same structure as the first infrared component (3-1).

9. The conveying device according to claim 8, characterized in that, The output signal of the infrared receiver tube (3-1-24) in the first infrared component (3-1) is connected to the signal input terminal P1.0 of the CPU via the first comparator (IC1). The output signals of the second infrared component (3-2), the third infrared component (3-3), and the fourth infrared component (3-4) are connected to other input terminals of the CPU in the same way.

10. The conveying device according to claim 9, characterized in that, The CPU's P2.1 output terminal is connected to the base of the first transistor (T1). The collector or emitter of the first transistor (T1) drives the first relay (J1), thereby controlling the on / off state of the first coil (DCT1) of the auxiliary magnet (2-21). The other output terminals of the CPU are connected to the coils of the auxiliary magnet (2-22), auxiliary magnet (2-23), auxiliary magnet (2-24), and main electromagnet (2-1) in the same way.

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