Non-contact belt slip detection system for belt conveyor

Abstract

The utility model discloses a non-contact belt slip detection system for a belt conveyor, which comprises an induction iron plate, a proximity switch, a proximity switch mounting rack, a PLC (programmable logic controller) and an alarm, the induction iron plate is fixed on one side of a driven wheel of the belt conveyor, and the induction iron plate can rotate along with the driven wheel of the belt conveyor. The proximity switch is arranged on one side of the induction iron plate, when the induction iron plate rotates to approach the proximity switch, the proximity switch is triggered, the proximity switch is installed on the proximity switch installation frame, the proximity switch is connected with the PLC, the PLC is connected with the alarm, and the PLC is further connected with a control system of the belt conveyor. Whether the belt slips or not is checked in a non-contact mode, abrasion to the belt is reduced, and the service life of the belt is prolonged; regular replacement of the trolley wheel is avoided, the cost is saved, and the production efficiency is indirectly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of belt conveyors, in particular to a non-contact belt slippage detection system for belt conveyors. Background Art

[0002] Belt conveyors have the advantages of strong conveying capacity, long conveying distance, simple structure, easy maintenance, convenient program control and automatic operation, etc. They are widely used in steel, electricity, coal mines and ports. Belt slippage may occur due to reasons such as too tight tensioning device, damage to the skin of the push roller, and pressing of the belt conveyor. After this phenomenon occurs, it should be discovered in time, and the machine should be shut down for maintenance and troubleshooting to resume production as soon as possible to avoid affecting production. Most of the existing methods for detecting belt slippage are to set a trolley. During operation, the belt is in close contact with the trolley to drive the trolley, so that the trolley reflects the actual belt speed of the belt. The trolley drives the transmission shaft in the detector to make the relay work. The relay works mainly by the wheel cutting the photoelectric signal, and the internal fixed value is compared with the actual value to generate a switch signal to complete the belt speed detection. This method generates friction due to the close contact between the belt and the trolley. Long-term use will cause wear on the belt and the trolley, affecting the service life of the belt and the trolley needs to be replaced regularly. Utility Model Content

[0003] In order to overcome the above-mentioned deficiencies in the prior art, the utility model provides a non-contact belt slippage detection system for a belt conveyor.

[0004] The technical solution adopted by the utility model is: a non-contact belt slip detection system for a belt conveyor, comprising an induction iron plate, a proximity switch, a proximity switch mounting frame, a PLC controller and an alarm, wherein the induction iron plate is fixed to one side of a driven wheel of the belt conveyor, the induction iron plate can rotate along with the driven wheel of the belt conveyor, the proximity switch is arranged on one side of the induction iron plate, when the induction iron plate rotates and approaches the proximity switch, the proximity switch is triggered, the proximity switch is mounted on the proximity switch mounting frame, the proximity switch is connected to the PLC controller, the PLC controller is connected to the alarm, and the PLC controller is also connected to the control system of the belt conveyor;

[0005] Furthermore, one end of the induction iron plate is welded to the side of the driven wheel of the belt conveyor through a connecting strip, and the other end is welded to the shaft of the driven wheel of the belt conveyor;

[0006] Furthermore, the distance between the induction iron plate and the side of the driven wheel of the belt conveyor is greater than 30 mm;

[0007] Furthermore, the distance between the induction iron plate and the proximity switch when induction occurs is 5-10 mm;

[0008] Furthermore, the PLC controller is also connected to a terminal display device;

[0009] Furthermore, the terminal display device is a mobile phone or a computer.

[0010] The utility model is based on the principle of the proximity switch. By means of the induction iron plate and the proximity switch arranged on the driven wheel of the belt conveyor, the rotation condition of the driven wheel is reflected to the PLC controller through the action of the proximity switch. The rotation condition of the driven wheel can also reflect whether the belt of the belt conveyor is slipping. If the belt slips, the driven wheel will not rotate or rotate abnormally. The contact switch will send such a signal to the PLC controller. The PLC determines whether there is slipping based on the comparison between the normal situation and the abnormal situation, and sends a command to the alarm.

[0011] The utility model has a simple structure and is easy to use. It adopts a non-contact method to check whether the belt is slipping, reduces the wear on the belt, and increases the service life of the belt; it avoids the regular replacement of the contact wheel, saves costs, and indirectly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the working process of the utility model.

[0013] Figure 2 This is a schematic diagram of the installation of the induction iron plate and proximity switch of the utility model.

[0014] In the figure: 1. Induction iron plate, 2. Proximity switch, 3. Proximity switch mounting bracket, 4. PLC controller, 5. Alarm, 6. Computer, 7. Mobile phone, 8. Connecting strip. DETAILED DESCRIPTION

[0015] In order to more clearly understand the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0016] like Figure 1-Figure 2As shown, a non-contact belt slip detection system for a belt conveyor includes an induction iron plate 1, a proximity switch 2, a proximity switch mounting frame 3, a PLC controller 4 and an alarm 5. The induction iron plate 1 is fixed on one side of a driven wheel of the belt conveyor. One end of the induction iron plate 1 is welded to the side of the driven wheel of the belt conveyor through a connecting strip 8, and the other end is welded to the shaft of the driven wheel of the belt conveyor. The distance between the induction iron plate 1 and the side of the driven wheel of the belt conveyor is greater than 30 mm. The distance between the induction iron plate 1 and the driven wheel is ensured to avoid the proximity switch 2 from inducing the induction iron plate 1 due to the driven wheel and the induction iron plate 1 being too close to each other. The induction iron plate 1 can rotate with the driven wheel of the belt conveyor. The proximity switch 2 is arranged on the induction iron plate 1. On one side of the iron plate 1, when the induction iron plate 1 rotates and approaches the proximity switch 2, the proximity switch 2 will be triggered. The distance between the induction iron plate 1 and the proximity switch 2 when induction occurs is 5-10mm, ensuring the effective sensing distance. The proximity switch 2 is installed on the proximity switch mounting frame 3, and the switch mounting frame can be welded and fixed on the belt conveyor frame. The proximity switch 2 is connected to the PLC controller 4, and the PLC controller 4 is connected to the alarm 5. The PLC controller 4 is also connected to the control system of the belt conveyor. When the PLC controller 4 receives the signal of the proximity switch 2 and determines that it is a belt slipping situation, it will issue a command to the alarm 5 to prompt the staff, and at the same time issue a command to the belt conveyor control system to stop the belt conveyor;

[0017] Preferably, the PLC controller 4 is also connected to a terminal display device, which is a mobile phone 7 or a computer 6. The PLC controller 4 can transmit the belt slip information to the staff's mobile phone 7 or computer 6 via a wired or wireless network, so that the staff can receive the belt slip information in time.

[0018] Working principle: When the conveyor belt slips, the driven wheel of the conveyor belt does not rotate or rotates abnormally. At this time, due to the non-rotation or abnormal rotation of the driven wheel, the induction iron plate 1 that rotates with the driven wheel will also have a corresponding situation, which will cause the induction between the induction iron plate 1 and the proximity switch 2 to be abnormal, and the signal transmitted to the PLC controller 4 by the proximity switch 2 will be abnormal. The PLC compares the returned signal with the set normal value to determine whether slipping has occurred. If slipping has occurred, the PLC will pass the command to the alarm 5, and at the same time issue a command to stop the belt conveyor, and send the abnormal information to the staff's computer 6 and mobile phone 7.

[0019] The above description is only a preferred embodiment of the present utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A non-contact belt slip detection system for a belt conveyor, characterized in that: It includes an induction iron plate, a proximity switch, a proximity switch mounting frame, a PLC controller and an alarm. The induction iron plate is fixed on one side of a driven wheel of a belt conveyor. The induction iron plate can rotate along with the driven wheel of the belt conveyor. The proximity switch is arranged on one side of the induction iron plate. When the induction iron plate rotates and approaches the proximity switch, the proximity switch is triggered. The proximity switch is mounted on the proximity switch mounting frame. The proximity switch is connected to the PLC controller. The PLC controller is connected to the alarm. The PLC controller is also connected to the control system of the belt conveyor.

2. A non-contact belt slip detection system for a belt conveyor according to claim 1, characterized in that: One end of the induction iron plate is welded to the side of the driven wheel of the belt conveyor through a connecting strip, and the other end is welded to the shaft of the driven wheel of the belt conveyor.

3. A non-contact belt slip detection system for a belt conveyor according to claim 1, characterized in that: The distance between the induction iron plate and the side of the driven wheel of the belt conveyor is greater than 30 mm.

4. A non-contact belt slip detection system for a belt conveyor according to claim 1, characterized in that: The distance between the induction iron plate and the proximity switch when induction occurs is 5-10 mm.

5. The non-contact belt slip detection system for a belt conveyor according to claim 1, characterized in that: The PLC controller is also connected to a terminal display device.

6. A non-contact belt slippage detection system for a belt conveyor according to claim 4, characterized in that: The terminal display device is a mobile phone or a computer.

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