A chain breakage monitoring device for a mining scraper conveyor

Abstract

The utility model discloses a kind of mine scraper conveyor chain break monitoring devices, the monitoring device includes proximity switch, current transformer and controller;The signal output end of the proximity switch is connected with the output end of current transformer and the signal input end of controller;The proximity switch is installed in the chain scraper both sides of head, for monitoring scraper conveyor chain;The current transformer monitors the input current of the motor of scraper conveyor.The monitoring device of the utility model makes judgment after the occurrence of chain break condition, and controller makes judgment through the signal monitored by proximity switch and current transformer, controls head, tail motor to stop quickly, effectively avoids overload operation after scraper conveyor failure, stops in time to ensure equipment safety to avoid larger range failure, improve coal mining efficiency, reduce enterprise production cost.

Description

Technical Field

[0001] This utility model relates to the field of monitoring and control of coal mine machinery and equipment, specifically to a chain breakage monitoring device for scraper conveyors in working faces. Background Technology

[0002] Due to uneven coal cutting and large pieces getting stuck on the scraper during production, scraper conveyors frequently experience chain breakage accidents. If not detected in time, the scraper conveyor chain is pulled into the trough, causing extensive damage to the conveyor belt. The lengthy handling time of these accidents seriously impacts safe production. Currently, there are no mature and reliable chain breakage early warning devices for scraper conveyors, or the existing devices are unreliable. Due to their low level of intelligence, they often fail to provide automatic detection and control to protect operators during use, thus requiring improvement. In recent years, some universities and equipment manufacturers have conducted some research on chain breakage monitoring. However, in terms of practicality, sensors cannot make judgments in a short time, making them unreliable in actual application. Sensor maintenance is also high, and malfunctions are frequent, so a reliable solution has not yet been formed. Furthermore, the harsh environment of coal mining faces makes the protection of electrical equipment at the working face particularly important. Therefore, to address the above shortcomings, it is necessary to propose a chain breakage monitoring device for mining scraper conveyors that is durable, quick to install, and has high detection reliability. Utility Model Content

[0003] The technical problem to be solved by this utility model is that the existing technology can only detect the state of the scraper, which has low accuracy and poor reliability. In order to solve the above problems, a chain breakage monitoring device for mining scraper conveyors is provided.

[0004] The objective of this utility model is achieved in the following manner:

[0005] A chain breakage monitoring device for a mining scraper conveyor includes a proximity switch, a current transformer, and a controller; the signal output terminal of the proximity switch and the output terminal of the current transformer are both connected to the signal input terminal of the controller; the proximity switch is installed on both sides of the scraper chain at the head of the conveyor for monitoring the scraper conveyor chain; the current transformer monitors the input current of the motor of the scraper conveyor.

[0006] At least two proximity switches are provided, respectively arranged on both sides of the scraper of the scraper conveyor.

[0007] The current transformer includes two components: one for monitoring the head motor and the other for monitoring the tail motor.

[0008] When the scraper conveyor is running normally, the proximity switches on both sides of the scraper simultaneously output a 10V electrical signal whenever the scraper passes through the proximity switch, and stop outputting a 10V electrical signal when the scraper passes through.

[0009] When the scraper conveyor is running normally, the current transformer monitors the input current signals of the head and tail motors, which are displayed stably within the specified range.

[0010] When the scraper chain of the scraper conveyor is a single chain, after the chain breaks, the proximity switches on both sides of the scraper will not output a 10V electrical signal for a long time and will not change, or will output a 10V electrical signal for a long time and will not change. The input current signal of the head and tail motors monitored by the current transformer will have a very small signal value for a long time, or the signal value will increase rapidly for a long time until the motor protection trip signal suddenly becomes zero.

[0011] When the scraper conveyor has a double chain, if only one chain breaks, one of the proximity switches on both sides of the scraper will output a 10V electrical signal, while the other side will not output a 10V electrical signal for a long time. The proximity switches on both sides cannot output a 10V electrical signal at the same time.

[0012] When the scraper conveyor has a double chain, if both chains break simultaneously, the proximity switches on both sides of the scraper will either not output a 10V electrical signal for a long time and will not change, or they will output a 10V electrical signal for a long time and will not change. The input current signal of the head and tail motors monitored by the current transformer will either have a very small signal value for a long time or the signal value will increase rapidly for a long time until the motor protection trip signal suddenly becomes zero.

[0013] When a chain break occurs, the controller makes a judgment based on the signals monitored by the proximity switch and current transformer, and controls the head and tail motors to stop quickly.

[0014] The beneficial effects of this utility model are as follows: After a chain break occurs, the controller of this utility model makes a judgment based on the signals monitored by the proximity switch and current transformer, and controls the head and tail motors to stop quickly. This effectively avoids overload operation after the scraper conveyor fails, and timely shutdown ensures equipment safety, prevents more widespread failures, improves coal mining efficiency, and reduces enterprise production costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the installation position of the proximity sensor of this utility model.

[0016] Figure 2 This is a schematic diagram of a chain breakage monitoring device system.

[0017] Among them, 1 is the scraper chain; 2 is the proximity switch; 3 is the current transformer; and 4 is the controller. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same technical meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0020] like Figure 2 As shown, this utility model provides a chain breakage monitoring device for a mining scraper conveyor. The monitoring device includes a proximity switch, a current transformer, and a controller; the signal output terminal of the proximity switch and the output terminal of the current transformer are both connected to the signal input terminal of the controller; as shown... Figure 1 As shown, the proximity switch is installed on both sides of the scraper chain at the machine head to monitor the scraper conveyor chain; the current transformer monitors the input current of the scraper conveyor motor.

[0021] At least two proximity switches are provided, respectively arranged on the outside of the chain on both sides of the scraper conveyor. For example... Figure 1 As shown, two proximity switches are respectively arranged on the support side and the coal wall side of the conveyor.

[0022] The current transformer includes two components: one for monitoring the head motor and the other for monitoring the tail motor.

[0023] When the scraper conveyor is running normally, the proximity switches on both sides of the scraper simultaneously output a 10V electrical signal whenever the scraper passes through the proximity switch, and stop outputting a 10V electrical signal when the scraper passes through.

[0024] When the scraper conveyor is running normally, the current transformer monitors the input current signals of the head and tail motors, which are displayed stably within the specified range.

[0025] The controller communicates with the control terminals of the head motor and tail motor.

[0026] When the scraper chain of a scraper conveyor suddenly breaks, there are two possible scenarios:

[0027] When the scraper chain of the scraper conveyor is a single chain, after the chain breaks, the proximity switches on both sides of the scraper will not output a 10V electrical signal for a long time and will not change, or will output a 10V electrical signal for a long time and will not change. The input current signal of the head and tail motors monitored by the current transformer will have a very small signal value for a long time, or the signal value will increase rapidly for a long time until the motor protection trip signal suddenly becomes zero.

[0028] When the scraper conveyor has a double-chain scraper, if only one chain breaks, one side of the proximity switches on both sides of the scraper will output a 10V electrical signal, while the other side will not output a 10V electrical signal for an extended period. The proximity switches on both sides cannot simultaneously output a 10V electrical signal. When the scraper conveyor has a double-chain scraper, if both chains break simultaneously, the proximity switches on both sides of the scraper will either not output a 10V electrical signal for an extended period and the signal will not change, or they will simultaneously output a 10V electrical signal for an extended period and the signal will not change. The current transformer monitoring the input current signals of the head and tail motors will show very low values ​​for an extended period, or the displayed values ​​will increase rapidly until the motor protection trip signal suddenly drops to zero.

[0029] During normal operation of the scraper conveyor, the proximity switches of this invention simultaneously output a 10V electrical signal on both sides of the scraper whenever the scraper passes through them, and cease outputting the 10V signal after the scraper has passed. During normal operation of the scraper conveyor, the current transformer monitors the input current signals of the head and tail motors, displaying a stable reading within a specified range. In the event of a chain break, the controller uses the signals monitored by the proximity switches and current transformer to determine the cause and quickly stop the head and tail motors.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A chain breakage monitoring device for a mining scraper conveyor, characterized in that: The monitoring device includes a proximity switch, a current transformer, and a controller; the signal output terminals of the proximity switch and the current transformer are both connected to the signal input terminal of the controller; the proximity switch is installed on both sides of the scraper chain at the machine head and is used to monitor the scraper conveyor chain; the current transformer monitors the input current of the scraper conveyor motor.

2. The chain breakage monitoring device for a mining scraper conveyor according to claim 1, characterized in that: At least two proximity switches are provided, respectively arranged on both sides of the scraper of the scraper conveyor.

3. The chain breakage monitoring device for a mining scraper conveyor according to claim 1, characterized in that: The current transformer includes two components: one for monitoring the head motor and the other for monitoring the tail motor.

4. The chain breakage monitoring device for a mining scraper conveyor according to claim 1, characterized in that: When the scraper conveyor is running normally, the proximity switches on both sides of the scraper simultaneously output a 10V electrical signal whenever the scraper passes through the proximity switch, and stop outputting a 10V electrical signal when the scraper passes through.

5. The chain breakage monitoring device for a mining scraper conveyor according to claim 1, characterized in that: When the scraper conveyor is running normally, the current transformer monitors the input current signals of the head and tail motors, which are displayed stably within the specified range.

6. The chain breakage monitoring device for a mining scraper conveyor according to claim 1, characterized in that: When the scraper chain of the scraper conveyor is a single chain, after the chain breaks, the proximity switches on both sides of the scraper will not output a 10V electrical signal for a long time and will not change, or will output a 10V electrical signal for a long time and will not change. The input current signal of the head and tail motors monitored by the current transformer will have a very small signal value for a long time, or the signal value will increase rapidly for a long time until the motor protection trip signal suddenly becomes zero.

7. The chain breakage monitoring device for a mining scraper conveyor according to claim 1, characterized in that: When the scraper conveyor has a double chain, if only one chain breaks, one of the proximity switches on both sides of the scraper will output a 10V electrical signal, while the other side will not output a 10V electrical signal for a long time. The proximity switches on both sides cannot output a 10V electrical signal at the same time.

8. The chain breakage monitoring device for a mining scraper conveyor according to claim 1, characterized in that: When the scraper conveyor has a double chain, if both chains break simultaneously, the proximity switches on both sides of the scraper will either not output a 10V electrical signal for a long time and will not change, or they will output a 10V electrical signal for a long time and will not change. The input current signal of the head and tail motors monitored by the current transformer will either have a very small signal value for a long time or the signal value will increase rapidly for a long time until the motor protection trip signal suddenly becomes zero.

9. The chain breakage monitoring device for a mining scraper conveyor according to claim 1, characterized in that: When a chain break occurs, the controller makes a judgment based on the signals monitored by the proximity switch and current transformer, and controls the head and tail motors to stop quickly.

Images