Belt tearing detection device

Abstract

The utility model relates to a belt tearing detection device which comprises a belt and supporting brackets, the belt is arranged above the supporting brackets which are symmetrically arranged, the belt tearing detection device further comprises a movable aluminum frame and a detection circuit, the movable aluminum frame is arranged on the supporting brackets below the belt at a material inlet, and a magnetic iron block is arranged at the end of the movable aluminum frame. The detection circuit is arranged below the magnetic iron block, and the supporting bracket is a step-shaped supporting block; the detection circuit comprises a high-frequency oscillation circuit, a rectification circuit and a drive relay circuit, the high-frequency oscillation circuit comprises a transformer and an oscillation circuit, a primary side coil of the transformer is arranged to be 5-15mm away from the magnetic iron block, a secondary side of the transformer is electrically connected with the oscillation circuit, the oscillation circuit is connected with the rectification circuit, and the rectification circuit is connected with the drive relay circuit. The rectification circuit is connected with the drive relay circuit. According to the utility model, the movable aluminum frame is utilized to realize closing and opening of the relay of the detection circuit, so that belt tearing detection is realized, and the device is convenient, durable and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial electrical automation of metallurgical enterprises, in particular to a belt tearing detection device. Background Art

[0002] Belt conveyors are used to transport loose materials or finished items. Depending on the conveying process requirements, they can be transported by a single unit, or they can be composed of multiple units or combined with different conveying equipment to form a horizontal or inclined conveying system. However, the belt is easily torn due to foreign matter jamming, sharp object puncture, etc. during the material transportation process. The existing belt tear detection device spare parts are difficult to customize, the rubber outer skin is prone to aging, and the service life is short. When the belt is torn, the detection device is easily subjected to strong extrusion and friction, resulting in inaccurate or damaged detection device, and the components are prone to failure, malfunction or inaction after aging.

[0003] The Chinese patent with the publication number CN219488694U discloses a belt tear detection device, comprising: a belt conveyor, comprising a return roller, a driving roller and a belt wound around the return roller and the driving roller; an infrared grating, whose transmitting end and receiving end are respectively located on both sides of the belt; the infrared rays emitted from the transmitting end of the infrared grating to the receiving end are perpendicular to the surface of the belt; a PLC system, connecting the belt conveyor and the infrared grating; the PLC system compares the belt width value detected by the infrared grating with the set value, and determines whether to issue an alarm signal and stop the operation of the belt conveyor. The utility model can compare with the set value of the belt width when the belt is torn or the edge of the belt is damaged. When the detected value is less than the set value of the belt width, an alarm signal is issued and the belt conveyor is stopped to prevent the expansion of equipment accidents, and has a good market application prospect; but if the invention uses an infrared grating when transporting the belt horizontally, it is easy to fail to detect the belt tearing part due to the obstruction of the material, and the laser detection signal is missed, thereby causing further damage and accidents to the belt, and such a device is only suitable for light industrial occasions with excellent environmental conditions, and cannot be used at all for the harsh environment of high dust in heavy industry. Summary of the invention

[0004] The utility model provides a belt tear detection device, which realizes timely detection of belt tear and has low cost and is durable, strong and reliable.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A belt tear detection device, comprising a belt and a support bracket, wherein the belt is arranged above the symmetrically arranged support bracket, and further comprising a movable aluminum frame and a detection circuit, wherein the movable aluminum frame is arranged on the support bracket below the belt at the material inlet, a magnetic guide block is arranged at the end of the movable aluminum frame, and the detection circuit is arranged below the magnetic guide block, and the support bracket is a step-type support block;

[0007] The detection circuit includes a high-frequency oscillation circuit, a rectifier circuit and a drive relay circuit. The high-frequency oscillation circuit includes a transformer and an oscillation circuit. The primary side coil of the transformer is set to 5 to 15 mm below the conductive magnetic block. The secondary side of the transformer is electrically connected to the oscillation circuit. The oscillation circuit is connected to the rectifier circuit, and the rectifier circuit is connected to the drive relay circuit.

[0008] Furthermore, the oscillation circuit includes a potentiometer, a resistor, a capacitor and a transistor, the emitter and base of the transistor are respectively connected to the corresponding resistor and capacitor parallel circuits, the base is also connected to the series circuit of the resistor and the potentiometer, the collector of the transistor is connected to the capacitor, and the secondary side of the transformer is divided into three paths, one path is connected to the two ends of the capacitor at the collector end of the transistor, one path is connected to the output end of the resistor and capacitor parallel circuit at the emitter end of the transistor and the input end of the rectifier circuit, and the other path is connected to the input end of the resistor and capacitor parallel circuit connected to the transistor base and the transistor base.

[0009] Furthermore, the rectifier circuit includes a diode, a capacitor and a resistor, the resistor is connected in parallel with the capacitor and then in series with the diode, and then in parallel with another diode.

[0010] Furthermore, the distance between the belt and the movable aluminum frame is 10 to 20 mm.

[0011] Furthermore, the movable aluminum frame weighs 2 to 3 kg.

[0012] Furthermore, the driving relay circuit includes a transistor, a potentiometer, a resistor, a relay and a freewheeling diode. The driving relay circuit includes a transistor, a potentiometer, a resistor, a relay and a freewheeling diode. The freewheeling diode is connected in parallel with the relay and then connected to the collector of the transistor. The base of the transistor is connected to the parallel circuit of the transistor and the potentiometer and the resistor.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1) The movable aluminum frame is used to realize the relay of the detection circuit to close and disconnect, thereby realizing the detection of belt tearing;

[0015] 2) Use a movable aluminum frame to reduce the wear of the detection components, which is convenient, durable and low-cost;

[0016] 3) The device has a simple structure and can be modified based on the original system with small changes, making it easy to implement and promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural side view of the utility model.

[0018] Figure 2 It is a schematic diagram of the support bracket structure described in the utility model.

[0019] Figure 3 It is a structural sectional view of the utility model along the running direction of the belt.

[0020] Figure 4 It is a wiring diagram of the detection circuit described in the embodiment of the utility model.

[0021] In the figure: 1. Belt 2. Support bracket 3. Movable aluminum frame 4. Detection circuit 5. Material 6. Magnetic block DETAILED DESCRIPTION

[0022] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0023] See Figure 1-3 , is a schematic diagram of the structure of the utility model. The utility model is a belt tear detection device, comprising a belt 1 and a support bracket 2, wherein the belt 1 is arranged above the symmetrically arranged support bracket 2, wherein the support bracket 2 is a step-type support block, and further comprising a movable aluminum frame 3 and a detection circuit 4, wherein the movable aluminum frame 3 is arranged on the support bracket 2 below the belt 1 at the entrance of the material 5, wherein a magnetic guide block 6 is arranged at the end of the movable aluminum frame 3, wherein the detection circuit 4 is arranged below the magnetic guide block 6, wherein the distance between the belt 1 and the movable aluminum frame 3 is 10 to 20 mm, and the weight of the movable aluminum frame 3 is 2 to 3 kg;

[0024] See Figure 4 The detection circuit 4 includes a high-frequency oscillation circuit, a rectifier circuit and a driving relay circuit. The high-frequency oscillation circuit includes a transformer T1 and an oscillation circuit. The primary side coil of the transformer T1 is arranged 5 to 15 mm below the conductive magnet block 6 embedded at the end of the movable aluminum frame 3. The secondary side of the transformer T1 is electrically connected to the oscillation circuit. The oscillation circuit is connected to the rectifier circuit, and the rectifier circuit is connected to the driving relay circuit.

[0025] The oscillation circuit includes a potentiometer R1, resistors R3, R4, R6, capacitors C1-C3 and a transistor Q1. The secondary winding of the transformer T1 is divided into three paths, one path is connected to the collector of the transistor Q1, one path is connected to the base of the transistor Q1, and the other path is connected to the input end of the rectifier circuit. The emitter of the transistor Q1 is connected to a parallel circuit of a resistor R6 and a capacitor C3, the other end of the secondary winding of the transformer T1 connected to the base of the transistor Q1 is connected to a parallel circuit of a resistor R4 and a capacitor C1, the other end of the secondary winding of the transformer T1 connected to the base of the transistor Q1 is also connected to a series circuit of a resistor R3 and a potentiometer R4, and the collector of the transistor Q1 is connected to a capacitor C2.

[0026] The rectifier circuit includes diodes D2 and D3, a capacitor C4 and a resistor R7. The resistor R7 is connected in parallel with the capacitor C4 and then in series with the diode D2, and then in parallel with the diode D3.

[0027] The driving relay circuit includes transistors Q2 and Q3, potentiometer R2, resistor R5, relay K1 and freewheeling diode D1. The freewheeling diode D1 is connected in parallel with the relay K1 and then connected to the collector of the transistor Q3. The base of the transistor Q3 is connected to the parallel circuit of the transistor Q2 and the potentiometer R2 and the resistor R5. The base of Q2 is connected to the rectifier circuit and the collector is connected to the base of Q3 to provide a switching signal for Q3.

[0028] Working principle: The principle of the belt tear protection device in the prior art is that when a crack appears on the belt 1, the material on the belt 1 will be exposed to the back of the belt 1. After the sensor against the back of the belt 1 is squeezed, the resistance of the internal conductive material decreases. The electronic circuit connected to the sensor detects this change and activates the output relay, causing the protection device to send a signal and shut down.

[0029] The present device is now used. When the distance between the magnetic guide block 6 embedded at the end of the movable aluminum frame 3 and the coil of the transformer T1 of the detection circuit 4 is within the range of 5 to 15 mm, the output relay of the detection circuit 4 is in the energized state, and the protection circuit does not operate. When the belt 1 is torn, the material 5 exposed on the back of the belt 1 will hit the movable aluminum frame 3, causing it to move with the push of the material 5 and move to Figure 1 The dotted box indicates the position. At this time, the movable aluminum frame 3 leaves the detection distance of the detection circuit 4, and the detection circuit 4 will disconnect the output relay release contact, the protection circuit will be activated, a signal will be sent out and the machine will be shut down.

[0030] The high-frequency transformer T1 is used as a detection probe to detect metal objects. When the metal object is not close to the detection probe, the high-frequency oscillator oscillates and its output oscillation signal is rectified by the rectifier circuit to generate a DC voltage to saturate the transistor Q2 and turn it on. The transistor Q3 is turned off and the relay is in a released state. When a metal object approaches the detection probe, eddy current loss will be generated to stop the high-frequency oscillator. The transistor Q2 is turned off due to the disappearance of the DC voltage at the base, the transistor Q3 is turned on, and the relay K1 is energized. The detection distance and detection sensitivity can be changed by adjusting the resistance of the potentiometers R1 and R2.

[0031] The above embodiments are implemented based on the technical solution of the utility model, and detailed implementation methods and specific operation processes are given, but the protection scope of the utility model is not limited to the above embodiments. The methods used in the above embodiments are conventional methods unless otherwise specified.

Claims

1. A belt tear detection device, comprising a belt and a support bracket, wherein the belt is arranged above the symmetrically arranged support bracket, characterized in that: It also includes a movable aluminum frame and a detection circuit, wherein the movable aluminum frame is arranged on a support bracket below the belt at the material inlet, a magnetic guide block is arranged at the end of the movable aluminum frame, the detection circuit is arranged below the magnetic guide block, and the support bracket is a step-type support block; The detection circuit includes a high-frequency oscillation circuit, a rectifier circuit and a drive relay circuit. The high-frequency oscillation circuit includes a transformer and an oscillation circuit. The primary side coil of the transformer is set to 5 to 15 mm below the conductive magnetic block. The secondary side of the transformer is electrically connected to the oscillation circuit. The oscillation circuit is connected to the rectifier circuit, and the rectifier circuit is connected to the drive relay circuit.

2. A belt tear detection device according to claim 1, characterized in that: The oscillation circuit includes a potentiometer, a resistor, a capacitor and a transistor, the emitter and base of the transistor are respectively connected to the corresponding resistor and capacitor parallel circuits, the base is also connected to the series circuit of the resistor and the potentiometer, the collector of the transistor is connected to the capacitor, and the secondary side of the transformer is divided into three paths, one path is connected to the two ends of the capacitor at the collector end of the transistor, one path is connected to the output end of the resistor and capacitor parallel circuit at the emitter end of the transistor and the input end of the rectifier circuit, and the other path is connected to the input end of the resistor and capacitor parallel circuit connected to the base of the transistor and the base of the transistor.

3. A belt tear detection device according to claim 1, characterized in that: The rectifier circuit includes a diode, a capacitor and a resistor. The resistor is connected in parallel with the capacitor and then in series with a diode, and then in parallel with another diode.

4. A belt tear detection device according to claim 1, characterized in that: The distance between the belt and the movable aluminum frame is 10-20 mm.

5. The belt tear detection device according to claim 1, characterized in that: The movable aluminum frame weighs 2 to 3 kg.

6. A belt tear detection device according to claim 1, characterized in that: The driving relay circuit includes a transistor, a potentiometer, a resistor, a relay and a freewheeling diode. The freewheeling diode is connected in parallel with the relay and then connected to the collector of the transistor. The base of the transistor is connected to the parallel circuit of the transistor and the potentiometer and the resistor.

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