Conveying belt monitoring and protecting device of mining conveyor

Abstract

The utility model discloses a conveyor belt monitoring and protecting device of a mining conveyor. The conveyor belt monitoring and protecting device comprises a proximity switch, a permanent magnet, a delay relay and an intermediate relay, the permanent magnet is fixedly positioned in an auxiliary roller at the bottom of the conveyor; the proximity switch is fixedly connected with the conveyor through a support, located at the bottom of the conveyor and located on one side of the permanent magnet. And the delay relay and the intermediate relay are connected with the proximity switch. The conveyor belt monitoring and protecting device of the mining conveyor has the advantages of being easy and convenient to install, low in cost, high in reliability and sensitivity and the like, operation is easy, fault points can be rapidly and accurately positioned, and the fault points can be conveniently and rapidly found and processed.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine safety, in particular to a transmission belt monitoring and protection device for a mine conveyor. Background Art

[0002] Belt conveyor is the most widely used machine for transporting materials in coal mines. Its main working principle is to use the belt for long-distance transportation. The friction between the conveyor belt and the roller is an important measure to ensure normal operation. However, during use, the belt conveyor is frequently started and stopped, which easily causes the belt tension to drop and break. As a result, after the tensioning device runs away, it cannot stop in time, causing the belt to slip, causing the drive roller to grind the belt for a long time, resulting in: frame damage, belt tearing, drive roller wear and debonding, and may cause a large amount of harmful smoke due to friction, causing personnel poisoning, fire and other accidents, seriously restricting the safe production work in the mine. Therefore, the tensioning part of the coal mine belt conveyor needs to be installed with a belt tension drop protection to detect the belt breakage phenomenon in time.

[0003] The existing modification device is to install a limit switch on the tensioning trolley guide rail. When the tensioning force drops or breaks, the tensioning trolley moves and hits the limit switch, causing the limit switch protection to take effect and the belt to stop. However, this method cannot quickly and accurately locate when the belt breaks, and its performance is unreliable. The tensioning force varies greatly with the heavy-load and light-load starts of the belt conveyor, making it difficult to control accurately and often causing malfunctions. The limit switch has no effective protection measures and cannot be reused once it is damaged by falling large pieces of coal gangue. Since the working environment of the belt conveyor is relatively harsh, once the falling coal gangue triggers the travel switch to cause malfunction, it will affect the normal production progress and reduce work efficiency. Since the tensioning trolley has a large impact force during movement, it is easy to damage the limit switch, which increases enterprise costs and causes waste of manpower and resources. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a transmission belt monitoring and protection device for a mining conveyor.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A conveyor belt monitoring and protection device for a mining conveyor includes a proximity switch 10, a permanent magnet 20, a time delay relay, and an intermediate relay; the permanent magnet 20 is fixedly located within an auxiliary roller 120 at the bottom of the conveyor; the proximity switch 10 is fixedly connected to the conveyor via a bracket 110, and is located at the bottom of the conveyor and on one side of the permanent magnet 20; the time delay relay and the intermediate relay are connected to the proximity switch 10.

[0007] In one embodiment of the present invention, under normal circumstances, the permanent magnet 20 is located within the auxiliary roller 120 and is not within the distance range where the proximity switch 10 generates the Hall effect. When the auxiliary roller 120 rotates, it drives the permanent magnet 20 to rotate synchronously. When the permanent magnet 20 and the proximity switch 10 are located on the same side, the permanent magnet 20 is within the distance range where the proximity switch 10 generates the Hall effect.

[0008] In one embodiment of the present invention, the time delay relay includes a time delay relay coil KT, a time delay normally closed auxiliary contact KT CB And delayed normally open auxiliary contact KT CK ; and the delay relay coil KT is energized, delaying the normally closed auxiliary contact KT CB Contact disconnection, delayed normally open auxiliary contact KT CK The contact is closed; the delay relay coil KT is connected in series with the proximity switch 10.

[0009] In one embodiment of the present invention, the conveyor belt monitoring and protection device of the mining conveyor further includes a normal state indicator light HG and an abnormal state indicator light HR; wherein the normal state indicator light HG and the delayed normally closed auxiliary contact KT CB Series connection; abnormal status indicator light HR and delayed normally open auxiliary contact KT CK Series connection.

[0010] In one embodiment of the present invention, the intermediate relay includes an intermediate relay coil K and an action normally closed auxiliary contact K CB ; The intermediate relay coil K and the delayed normally open auxiliary contact KT of the delay relay CK Series connection; action normally closed auxiliary contact K CB Connected in series with a device that can control the start and stop of the conveyor.

[0011] In one embodiment of the present invention, the conveyor belt monitoring and protection device of the mining conveyor further includes an alarm bell L; the alarm bell L is connected in parallel with the intermediate relay coil K.

[0012] In one embodiment of the present invention, the conveyor belt monitoring and protection device of the mining conveyor further includes a reset switch QS; the reset switch QS is connected in series with the proximity switch 10.

[0013] In one embodiment of the present invention, the proximity switch 10 adopts a three-wire Hall-type proximity switch; the three-wire Hall-type proximity switch includes a signal line, which is connected to a load. If the output end of the three-wire Hall-type proximity switch adopts a common anode thyristor, the other end of the load is connected to the positive electrode of the power supply; if the output end of the three-wire Hall-type proximity switch adopts a common cathode thyristor, the other end of the load is connected to the negative electrode of the power supply, and the negative electrode of the power supply is grounded.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] This utility model utilizes Hall-effect proximity switches and permanent magnets, combined with auxiliary rollers and an emergency stop mechanism for this application scenario. The device is easy to install and can be adjusted to its position. This device effectively prevents accidents caused by forced belt movement after tension drops, effectively protecting the safe operation of the conveyor. The utility model offers advantages such as reliability, high sensitivity, low cost, and resistance to damage. Therefore, its use in a belt conveyor break (tension drop) monitoring and protection device not only reduces investment and maintenance costs, but also improves the sensitivity of the entire device. Multiple installation locations ensure timely detection of belt breaks (tension drop) and allow for rapid and accurate location of the break, facilitating rapid identification and resolution of faults, ensuring smooth production. Compared to other technologies, this device offers advantages such as simple and convenient installation, low cost, high reliability, and high sensitivity. It provides strong support for centralized belt control and unmanned operation, reducing labor costs. Installed on the upper belt, this device can serve as an overload protection device and can also be used in other applications, such as overrun protection and weight restrictions for overhead passenger devices.

[0016] It has the advantages of simple installation, high reliability and sensitivity, fast frequency response, long service life, strong anti-interference ability, and is waterproof, shockproof, and corrosion-resistant. It can provide strong support for belt centralized control and unmanned operation, and can reduce labor costs.

[0017] It is easy to install, can be adjusted at will, and can be installed at multiple points for multi-point protection.

[0018] When a belt breaks, it can be discovered in time and the location of the accident can be located quickly and accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the installation position of the proximity switch and permanent magnet according to an embodiment of the present utility model.

[0020] Figure 2 This is an electrical schematic diagram of a conveyor belt monitoring and protection device for a mining conveyor according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0021] In order to facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described in conjunction with the accompanying drawings.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0023] See also Figure 1 As shown, the present invention provides a conveyor belt monitoring and protection device for a mining conveyor, comprising a proximity switch 10, a permanent magnet 20, a time delay relay, and an intermediate relay. The permanent magnet 20 is fixedly positioned within an auxiliary rod 120 at the bottom of the conveyor. The proximity switch 10 is fixedly connected to the conveyor via a bracket 110 and is located at the bottom of the conveyor, to one side of the permanent magnet 20. The time delay relay and the intermediate relay are connected to the proximity switch 10.

[0024] In this embodiment, auxiliary rollers 120 are positioned below the conveyor belt 130 on the conveyor. When the tension in the conveyor belt 130 drops below a certain level, it naturally sags and contacts the auxiliary rollers 120. During operation, the conveyor belt 130 drives the auxiliary rollers 120. The auxiliary rollers 120, as used in this technical field, assist the conveyor belt 130 in supporting and driving the drooping conveyor belt 130. Furthermore, they reduce the impact of the conveyor belt 130's operating force.

[0025] In this embodiment, under normal circumstances, the permanent magnet 20 is positioned within the auxiliary roller 120, outside the distance range for the proximity switch 10 to generate the Hall effect. Rotation of the auxiliary roller 120 drives the permanent magnet 20 to rotate synchronously. When the permanent magnet 20 and the proximity switch 10 are on the same side, the permanent magnet 20 is within the distance range for the proximity switch 10 to generate the Hall effect. Rotation of the auxiliary roller 120 indicates slack in the conveyor belt 130. When the permanent magnet 20 and the proximity switch 10 are on the same side, the proximity switch 10 detects the distance hill, or in other words, the Hall effect on the Hall element on the detection surface causes the switch's internal circuit state to change, thereby identifying the presence of a nearby magnetic object, such as the permanent magnet 20, and controlling the on / off state of the proximity switch 10. More specifically, the proximity switch 10 is secured by a bracket 110 no more than 10 mm from the end face of the auxiliary roller 120. The highest point of the auxiliary roller 120 is 2 mm from the working surface of the lower conveyor belt.

[0026] In this embodiment, the proximity switch 10 is specifically a Hall-type proximity switch. Two-wire Hall-type proximity switches are subject to operating conditions, generating a certain voltage drop when the switch is on and a certain residual current when it is off. These factors should be considered when selecting a switch. A three-wire proximity switch, while having an additional wire, is not subject to adverse factors such as residual current and operates more reliably. Therefore, a three-wire Hall-type proximity switch is employed in this embodiment. The three-wire Hall-type proximity switch includes two power lines and a signal line. The two power lines are connected to the positive and negative poles of the power supply according to polarity, respectively. The signal line is connected to the load. If the output of the three-wire Hall-type proximity switch uses a common-anode thyristor, the other end of the load is connected to the positive pole of the power supply. If the output of the three-wire Hall-type proximity switch uses a common-cathode thyristor, the other end of the load is connected to the negative pole of the power supply, which is then grounded.

[0027] See also Figure 1 and Figure 2 As shown, in this embodiment, the time delay relay includes a time delay relay coil KT, a time delay normally closed auxiliary contact KT CB And delayed normally open auxiliary contact KT CK . And the delay relay coil KT is energized, delaying the normally closed auxiliary contact KT CB Contact disconnection, delayed normally open auxiliary contact KT CK The contact is closed, and the delay relay coil KT is connected in series with the proximity switch 10.

[0028] In this embodiment, the intermediate relay includes an intermediate relay coil K and an action normally closed auxiliary contact K CB The intermediate relay coil K and the time delay relay's normally open auxiliary contact KT CK Series connection, action normally closed auxiliary contact K CB The device is connected in series with a device capable of controlling the start and stop of the conveyor, wherein the device capable of controlling the start and stop of the conveyor is connected in series with, for example, an on-site emergency stop control circuit or a PLC controller.

[0029] In this embodiment, the conveyor belt monitoring and protection device of the mining conveyor also includes a normal state indicator light HG, an abnormal state indicator light HR, an alarm bell L and a reset switch QS. Among them, the normal state indicator light HG and the delayed normally closed auxiliary contact KT CB Series connection; abnormal status indicator light HR and delayed normally open auxiliary contact KT CK In series, the alarm bell L is connected in parallel with the intermediate relay coil K, and the reset switch QS is connected in series with the proximity switch 10. Specifically, the normal state indicator light HG is green, and the abnormal state indicator light HR is red.

[0030] See also Figure 1 and Figure 2As shown, in one embodiment of the present utility model, when the conveyor belt 130 of the conveyor operates normally, the belt does not contact the auxiliary roller 120, the auxiliary roller 120 does not rotate, and the proximity switch 10 cannot detect the magnetic force of the permanent magnet 20, it is in a stationary state as a normally open state, the delay relay and the intermediate relay do not operate, and the output is normally open at this time, and the normal state indicator light HG is on.

[0031] When the conveyor belt 130 of the conveyor breaks or the tension drops, the conveyor belt 130 falls due to gravity and touches the auxiliary roller 120, driving it to rotate. At this time, the proximity switch 10 detects a magnetic signal. The delay relay and the intermediate relay start to operate after receiving the proximity switch 10 transmission signal three times (to prevent false operation). The delay normally closed auxiliary contact KT CB Becomes open circuit, delayed normally open auxiliary contact KT CK On / off, abnormal status indicator HR lights up, and the normally closed auxiliary contact K is activated CB The delayed disconnect signal is then output to the emergency stop device. Once the emergency stop device disconnects, the PLC controller detects the disconnection and stops the connected conveyor belt. When an alarm is installed, the PLC controller detects the disconnection of the emergency stop device and controls the alarm to sound, alerting personnel in a timely manner. The normally closed contacts of the emergency stop device are activated and transmitted via a signal line to the PLC controller or the integrated conveyor belt protector, causing the belt to stop. The protective device is tested by pressing the test button twice in succession to verify that the protective device is in normal working order.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be encompassed within the present invention, and any reference numerals in the claims should not be construed as limiting the claims to which they relate.

[0033] The above-mentioned embodiments only represent the implementation methods of the utility model. The protection scope of the utility model is not limited to the above-mentioned embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the utility model, which all fall within the protection scope of the utility model.

Claims

1. A conveyor belt monitoring and protection device for a mining conveyor, characterized in that: The invention comprises a proximity switch (10), a permanent magnet (20), a time delay relay and an intermediate relay; the permanent magnet (20) is fixedly located in an auxiliary roller (120) at the bottom of a conveyor; the proximity switch (10) is fixedly connected to the conveyor through a bracket (110), and is located at the bottom of the conveyor and on one side of the permanent magnet (20); the time delay relay and the intermediate relay are connected to the proximity switch (10).

2. The mining conveyor belt monitoring and protection device according to claim 1 is characterized in that: Under normal circumstances, the permanent magnet (20) is located inside the auxiliary roller (120) and is not within the distance range where the proximity switch (10) generates a Hall effect. When the auxiliary roller (120) rotates, it drives the permanent magnet (20) to rotate synchronously. When the permanent magnet (20) and the proximity switch (10) are located on the same side, the permanent magnet (20) is within the distance range where the proximity switch (10) generates a Hall effect.

3. The mining conveyor belt monitoring and protection device according to claim 1 is characterized in that: The time delay relay includes the time delay relay coil (KT), the time delay normally closed auxiliary contact (KT CB ) and delayed normally open auxiliary contacts (KT CK ); and the delay relay coil KT is energized, delaying the normally closed auxiliary contact (KT CB ) contact is disconnected, delayed normally open auxiliary contact (KT CK ) contacts are closed; the time delay relay coil (KT) is connected in series with the proximity switch (10).

4. The mining conveyor belt monitoring and protection device according to claim 3 is characterized in that: The conveyor belt monitoring and protection device of the mining conveyor also includes a normal state indicator light (HG) and an abnormal state indicator light (HR); wherein, the normal state indicator light (HG) and the delayed normally closed auxiliary contact (KT CB ) in series; abnormal status indicator light (HR) and delayed normally open auxiliary contact (KT CK ) in series.

5. The mining conveyor belt monitoring and protection device according to claim 1 is characterized in that: The intermediate relay includes the intermediate relay coil (K) and the normally closed auxiliary contact (K CB ); the intermediate relay coil (K) and the time delay relay's normally open auxiliary contact (KT CK ) in series; action normally closed auxiliary contact (K CB ) is connected in series with a device that can control the start and stop of the conveyor.

6. The mining conveyor belt monitoring and protection device according to claim 5, characterized in that: The conveyor belt monitoring and protection device of the mining conveyor further comprises an alarm bell (L); the alarm bell (L) is connected in parallel with the intermediate relay coil (K).

7. The mining conveyor belt monitoring and protection device according to claim 1 is characterized in that: The conveyor belt monitoring and protection device of the mining conveyor further comprises a reset switch (QS); the reset switch (QS) is connected in series with the proximity switch (10).

8. The mining conveyor belt monitoring and protection device according to claim 1 is characterized in that: The proximity switch (10) adopts a three-wire Hall type proximity switch; The three-wire Hall-type proximity switch includes a signal line, which is connected to the load. If the output end of the three-wire Hall-type proximity switch adopts a common anode thyristor, the other end of the load is connected to the positive pole of the power supply. If the output end of the three-wire Hall-type proximity switch adopts a common cathode thyristor, the other end of the load is connected to the negative pole of the power supply, and the negative pole of the power supply is grounded.

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