Chain plate monitoring and protecting device for scraper

Abstract

The utility model relates to a chain plate monitoring and protecting device for a scraper. In order to find chain breakage of the scraper conveyor earlier and give out early warning earlier, the device comprises a sensor, a programmable controller and a scraper conveyor start-stop device, and further comprises a fixing frame and two suspension rods, the tops of the two suspension rods are hinged and fixed to the fixing frame through a horizontal hinge transverse shaft, the lower ends of the two suspension rods are lower than the upper edge of a scraper of the matched scraper conveyor, and the sensor is connected with the programmable controller. A photoelectric proximity switch is arranged on the outer side of each suspension rod, the two photoelectric proximity switches form a sensor, when a scraper of the matched scraper passes through the two suspension rods, the two suspension rods can be pushed to be separated from the opposite photoelectric proximity switches, and after the programmable controller induces that induction signals of the photoelectric proximity switches are interrupted, the sensor is controlled to be switched off. And the difference value of the induction signal interruption moments of the two photoelectric proximity switches is calculated, the scraper conveyor is normally operated or emergently stopped according to the difference value, and an alarm is given out. The device is simple in structure and suitable for enterprises such as coal mines or thermal power plants.

Description

TECHNICAL FIELD

[0001] The utility model relates to a chain plate monitoring and protecting device for a scraper. BACKGROUND

[0002] If the scraper conveyor cannot be stopped in a very short time after a chain breakage accident, a serious chain winding phenomenon will occur, which brings a lot of workload to maintenance and recovery.

[0003] A scraper anti-inclination protection device is disclosed in the Chinese utility model patent with the publication number CN208150376U, which was authorized on November 27, 2018. The device includes a sensor, which is arranged above a detection hole and fixed on a fixed base. The detection hole is arranged at both ends of a scraper cover plate. The sensor is used to detect the synchronization of both ends of the scraper and is electrically connected to a single-chip microcomputer control system. The sensor relies on a diffuse reflection photoelectric sensor, and one sensor is arranged at each end of the scraper cover plate. The diffuse reflection photoelectric sensor of the utility model is easily affected by coal powder and dust, which affects its working stability.

[0004] A scraper conveyor chain breakage early warning device is disclosed in the Chinese utility model patent with the publication number CN214326329U, which was authorized on October 1, 2021. The device includes a scraper conveyor, a sensor, a programmable controller, and a scraper conveyor start-stop device. When the scraper conveyor starts, a start signal of the scraper conveyor device is sent to the programmable controller of the scraper conveyor chain breakage early warning device. The device starts to work, and the sensor installed above the variable chute of the scraper conveyor starts to work. If the programmable controller starts but the sensor does not detect the scraper running signal, the programmable controller logically judges that the scraper conveyor chain is broken, and then sends a stop signal. After the chain is broken, the device can effectively detect and stop in time to ensure the safety of the equipment.

[0005] In the scraper conveyor chain breakage early warning device, the integrated vibration transmitter senses the vibration of the scraper running through the metal chain, so as to determine whether there is a chain breakage. This method only detects no scraper running signal when both chains of the scraper conveyor are broken. However, when the scraper conveyor chain is broken, it is rare that both chains are broken at the same time. In most cases, one chain is broken first, and the scrapers continue to run in an unbalanced state for a period of time under the traction of the single chain, until the unbroken chain is also pulled off. However, before this, almost all the scrapers will be deformed, which causes great difficulty in repairing the scraper conveyor. SUMMARY

[0006] The utility model wants to solve the technical problem how to discover the chain breakage of the scraper conveyor earlier and send the chain breakage early warning, provide a chain plate monitoring protection device for scraper conveyor.

[0007] In order to solve the above technical problem, the chain plate monitoring protection device for scraper conveyor includes sensor, programmable controller and scraper conveyor start-stop device, the signal output end of sensor is connected with the signal input end of programmable controller, the scraper conveyor start-stop device is connected with programmable controller, and it is characterized in that: it further includes fixing frame and two suspension rods, the fixing frame is arranged above the coal conveying groove of the non-coal section matched with the scraper conveyor, the top of the two suspension rods is respectively connected with a horizontal hinged horizontal shaft, and the horizontal hinged horizontal shaft is hingedly fixed on the fixing frame, the axis of the two horizontal hinged horizontal shafts is coincident, the lower part of the two suspension rods is located in the coal conveying groove, and the lower end is lower than the upper edge of the scraper matched with the scraper conveyor, one photoelectric proximity switch is arranged on the outer side of each suspension rod, and the two photoelectric proximity switches form the sensor, when the scraper matched with the scraper conveyor passes the two suspension rods, the two suspension rods can be pushed to separate from the photoelectric proximity switch opposite to it, after the sensing signal of the photoelectric proximity switch is sensed by the programmable controller, the difference between the adjacent interruption time of the sensing signal of the two photoelectric proximity switches is calculated, if the absolute value of the difference is less than the first predetermined time, it is judged that the chain breakage does not occur and the scraper inclination does not occur, and the scraper matched with the scraper conveyor operates normally, if the first predetermined time is less than or equal to the absolute value of the difference and less than the second predetermined time, it is judged that the scraper inclination occurs, and the scraper inclination alarm signal is sent, if the second predetermined time is less than or equal to the absolute value of the difference, it is judged that the scraper inclination occurs, and it is judged that the chain breakage occurs, the programmable controller outputs the emergency stop signal to the scraper conveyor start-stop device, the operation of the scraper conveyor is stopped, and the chain breakage alarm signal is sent.

[0008] The programmable controller can be selected from Siemens S7-200 PLC. The coal conveying groove of the non-coal section matched with the scraper conveyor refers to the coal conveying groove between the coal outlet and the machine head or the coal conveying groove between the machine tail and the coal dropping position.

[0009] The first predetermined time can be temporarily set as 0.8 seconds, the second predetermined time can be temporarily set as 1.2 seconds, and the longest time should not be more than 2 seconds. During use, the first predetermined time and the second predetermined time can be lengthened or shortened according to actual use needs. For example, during use, when the scraper inclination alarm signal occurs, after inspection, if the scraper inclination is not obvious, the first predetermined time can be appropriately lengthened, if the scraper inclination is too serious and needs to be warned in advance, the first predetermined time can be appropriately shortened. Similarly, during use, when the chain breakage alarm signal occurs, after inspection, if both the chains are not broken, the second predetermined time can be appropriately lengthened, if one chain is broken and the chain breakage alarm signal is not sent and the operation is not stopped, the second predetermined time needs to be appropriately shortened.

[0010] In this way, the structure is simple, and the operation is reliable.

[0011] As optimization, the fixed frame comprises upright columns welded on both sides of the coal blocking plate of the coal conveying chute and a horizontal rod welded on the top of the two upright columns, the top and middle parts of the upright columns are welded with an upper connecting rod and a middle connecting rod respectively, the photoelectric proximity switch is fixed on the middle connecting rod, a horizontal shaft sleeve is fixed on the upper connecting rod, and the horizontal hinged cross shaft is arranged in the horizontal shaft sleeve. Thus, the structure is simple and firm.

[0012] As optimization, each suspension rod is further provided with a limiting baffle, one end of the limiting baffle is fixed on the horizontal shaft sleeve, the other end extends to the upstream side of the moving direction of the scraper of the suspension rod, and limits the terminal point of the suspension rod to return to the vertical state under the gravity. Thus, the suspension rod can be restored to the vertical state as soon as possible after the scraper passes.

[0013] As optimization, the contact part of the limiting baffle and the suspension rod is further provided with an elastic buffer sleeve. Thus, the collision is slowed down, and the deformation of the limiting baffle is prevented.

[0014] As optimization, the suspension rod comprises an upper connecting plate and a lower rubber plate, the two are connected with each other, and the lower end of the lower rubber plate is in contact with the passing scraper. Thus, the collision spark between the lower end of the suspension rod and the passing scraper is prevented, and the abrasion of the scraper is reduced.

[0015] As optimization, the top of each upright column is fixed with an angle sensor, the angle sensor is connected with the signal input end of the programmable controller, one end of the adjacent horizontal hinged cross shaft is fixedly connected with the top of the suspension rod, the other end penetrates through the horizontal shaft sleeve and is connected with the angle sensor, the angle sensor outputs a zero point signal when the suspension rod is in the vertical state, and the programmable controller outputs a non-zero point signal when the output signal of any one angle sensor is a non-zero point signal, that is, the angle difference of the horizontal hinged cross shaft sensed by the two angle sensors is calculated, if the absolute value of the angle difference exceeds a predetermined angle, an emergency stop signal is output to the scraper conveyor start-stop device, the operation of the scraper is stopped, and an alarm signal is sent.

[0016] Due to the width of the suspension rod, the photoelectric proximity switch cannot sense the state change of the suspension rod when the passing scraper just touches the suspension rod and the suspension rod is not completely separated from the photoelectric proximity switch.

[0017] After the angle sensor is added, the chain plate monitoring and protecting device for the scraper can sense the angle difference of the two suspension rods as soon as the passing scraper pushes the suspension rod within the measurement range of the angle sensor, so that the inclination of the scraper is detected earlier and the early warning is performed.

[0018] The chain plate monitoring and protecting device for the scraper has a simple structure and reliable operation, when the inclination of the scraper or the chain breakage accident of any one side is monitored, the automatic device outputs a stop signal in a very short time, serious chain winding phenomenon is avoided, the loss caused by the accident time is reduced to a minimum, and the device is suitable for use in coal mines or thermal power plants. Attached Figure Description

[0019] The following description, in conjunction with the accompanying drawings, further illustrates the chain plate monitoring and protection device for scraper conveyors of this utility model:

[0020] Figure 1 This is a partial three-dimensional structural diagram of the first embodiment of the chain plate monitoring and protection device for the scraper conveyor under the condition of use;

[0021] Figure 2 When the scraper conveyor is in normal operation Figure 1 The diagram shows the trend of the sensing signals of the two photoelectric proximity switches.

[0022] Figure 3 When the scraper blade of the scraper conveyor tilts or the chain breaks Figure 1 The diagram shows the trend of the sensing signals of the two photoelectric proximity switches.

[0023] Figure 4 This is a schematic diagram of the second embodiment of the chain plate monitoring and protection device for the scraper conveyor.

[0024] Figure 1 , 4 The hollow arrow indicates the direction of movement of the upper scraper of the scraper conveyor.

[0025] In the diagram: 1 is the suspension rod, 2 is the coal conveying trough, 3 is the horizontally hinged cross shaft, 4 is the scraper, 5 is the photoelectric proximity switch, 6 is the coal retaining plate, 7 is the column, 8 is the crossbar, 9 is the upper connecting rod, 10 is the middle connecting rod, 11 is the horizontal bushing, 12 is the limit baffle, 13 is the elastic buffer sleeve, 101 is the upper connecting plate, 102 is the lower rubber plate, 14 is the angle sensor, and 15 is the chain.

[0026] Figure 2 , Figure 3 In the diagram, t1 and t2 represent the times when the photoelectric proximity switch's sensing signal is interrupted, respectively, and Δt is the difference between time t1 and time t2. Detailed Implementation

[0027] Implementation method one: such as Figures 1-3As shown, the chain plate monitoring and protecting device of the scraper conveyor comprises a sensor, a programmable controller and a scraper conveyor start-stop device, the signal output end of the sensor is connected with the signal input end of the programmable controller, and the scraper conveyor start-stop device is connected with the programmable controller, characterized in that: it further comprises a fixing frame and two suspension rods 1, the fixing frame is arranged above the coal conveying groove 2 of the coal conveying section matched with the scraper conveyor, the top of each suspension rod 1 is respectively connected with a horizontal hinged horizontal shaft 3, and the horizontal hinged horizontal shaft 3 is hingedly fixed on the fixing frame; the axis lines of the two horizontal hinged horizontal shafts 3 coincide; the lower part of each suspension rod 1 is located in the coal conveying groove 2, and the lower end of each suspension rod 1 is lower than the upper edge of the scraper 4 matched with the scraper conveyor; one photoelectric proximity switch 5 is arranged on the outer side of each suspension rod 1, and the two photoelectric proximity switches 5 constitute the sensor; when the scraper 4 matched with the scraper conveyor passes through the two suspension rods 1, the two suspension rods 1 are pushed away from the photoelectric proximity switches 5 opposite to the two suspension rods 1; after the programmable controller senses the sensing signal of the photoelectric proximity switch 5, the difference Δt between the adjacent interruption time of the sensing signals of the two photoelectric proximity switches 5 is calculated; if the absolute value of the difference Δt is less than a first predetermined time, it is judged that the chain is not broken and the scraper is not tilted, and the matched scraper conveyor is normally operated; if the first predetermined time is less than the absolute value of the difference Δt and the second predetermined time is less than the absolute value of the difference Δt, it is judged that the scraper 4 is tilted, and a scraper tilt alarm signal is sent; if the second predetermined time is less than the absolute value of the difference Δt, it is judged that the scraper 4 is tilted and the chain is broken, and the programmable controller outputs an emergency stop signal to the scraper conveyor start-stop device to stop the operation of the scraper conveyor, and a chain break alarm signal is sent.

[0028] The fixing frame comprises vertical columns 7 welded on the coal blocking plates 6 on both sides of the coal conveying groove 2 and a horizontal rod 8 welded on the top of the two vertical columns 7, the top and middle of the vertical column 7 are respectively welded with an upper connecting rod 9 and a middle connecting rod 10 inward, the photoelectric proximity switch 5 is fixed on the middle connecting rod 10, a horizontal shaft sleeve 11 is fixed on the upper connecting rod 10, and the horizontal hinged horizontal shaft 3 is arranged in the horizontal shaft sleeve 11.

[0029] Each suspension rod 1 is further provided with a limiting baffle 12, one end of the limiting baffle 12 is fixed on the horizontal shaft sleeve 11, the other end extends to the upstream side of the moving direction of the scraper 4 of the suspension rod 1, and limits the final point of the return swing of the suspension rod 1 under the gravity to be in the vertical state. The contact part of the limiting baffle 12 and the suspension rod 1 is further provided with an elastic buffer sleeve 13. The suspension rod 1 comprises an upper connecting plate 101 and a lower rubber plate 102, which are connected with each other and contact with the passing scraper 4 through the lower end of the lower rubber plate 102.

[0030] Embodiment two: as Figure 4As shown, an angle sensor 14 is fixed at the top of each column 7, which is connected with the signal input end of the programmable controller. One end of the adjacent horizontal hinged cross shaft 3 is fixedly connected with the top of the suspension rod 1, and the other end passes through the horizontal shaft sleeve 11 and is connected with the angle sensor 14. When the suspension rod 1 is in the vertical state, the output signal of the angle sensor 14 is the zero point signal. When the output signal of any one angle sensor 14 of the programmable controller is the non-zero point signal, the angle difference of the horizontal hinged cross shaft 3 sensed by the current two angle sensors 14 is calculated. If the absolute value of the angle difference exceeds the predetermined angle, an emergency stop signal is output to the scraper conveyor start-stop device, the operation of the scraper is stopped, and an alarm signal is sent. The rest of the structure is as described in embodiment one.

Claims

1. A scraper chain monitoring and protection device for a scraper, comprising a sensor, a programmable controller and a scraper conveyor start-stop device, the signal output end of the sensor is connected with the signal input end of the programmable controller, and the scraper conveyor start-stop device is connected with the programmable controller, characterized in that: It also includes a fixed frame and two suspension rods, the fixed frame is arranged above the coal conveying trough of the coal conveying trough without coal in the coal conveying trough, the top of the two suspension rods is respectively connected to a horizontal hinge shaft, and the horizontal hinge shaft is hingedly connected to the fixed frame. The axis lines of the two horizontal hinge shafts coincide, the lower part of the two suspension rods is located in the coal conveying trough, and the lower end thereof is lower than the upper edge of the scraper of the scraper. An optical proximity switch is arranged on the outer side of each suspension rod, and the two optical proximity switches constitute the sensor. When the scraper passes through the two suspension rods, the two suspension rods can push away the optical proximity switches opposite thereto. After the programmable controller senses the sensing signal of the optical proximity switch, the difference between the adjacent interruption time of the sensing signals of the two optical proximity switches is calculated. If the absolute value of the difference is less than a first predetermined time, it is judged that the chain is not broken and the scraper is not tilted, and the scraper operates normally. If the first predetermined time is less than the absolute value of the difference and the second predetermined time is less than the absolute value of the difference, it is judged that the scraper is tilted, and an alarm signal of the tilted scraper is sent. If the second predetermined time is less than the absolute value of the difference, it is judged that the chain is broken, and the programmable controller outputs an emergency stop signal to the scraper conveyor start-stop device to stop the operation of the scraper, and sends a chain breakage alarm signal. ​ 2. The chain flight monitoring and protection device for a flight bar machine according to claim 1, characterized in that: The fixed frame includes vertical columns welded to the coal blocking plates on both sides of the coal conveying trough and a horizontal rod welded to the top of the two vertical columns. The top and middle of the vertical column are respectively welded to an upper connecting rod and a middle connecting rod inward. The optical proximity switch is fixed to the middle connecting rod. The upper connecting rod is fixed with a horizontal shaft sleeve, and the horizontal hinge shaft is arranged in the horizontal shaft sleeve.

3. The chain flight monitoring and protection device for a flight bar machine according to claim 2, characterized in that: Each suspension rod is also provided with a limiting baffle, one end of which is fixed to the horizontal shaft sleeve, and the other end extends to the upstream side of the scraper moving direction of the suspension rod and limits the termination point of the suspension rod swinging back under the gravity to the vertical state.

4. The chain flight monitoring and protection device for a flight bar machine according to claim 3, characterized in that: The limiting baffle and the contact part of the suspension rod are also provided with an elastic buffer sleeve.

5. The chain flight monitoring and protection device for a flight bar machine according to claim 2, characterized in that: The suspension rod includes an upper connecting plate and a lower rubber plate, which are connected to each other and contact the passing scraper through the lower end of the lower rubber plate.

6. The chain monitoring and protection device for a scraper according to any one of claims 2 to 5, characterized in that: Each vertical column is fixed with an angle sensor, which is connected to the signal input end of the programmable controller. One end of the adjacent horizontal hinge shaft is fixedly connected to the top of the suspension rod, and the other end penetrates through the horizontal shaft sleeve and is connected to the angle sensor. When the suspension rod is in the vertical state, the output signal of the angle sensor is a zero point signal. When the output signal of any one angle sensor of the programmable controller is a non-zero point signal, the difference between the angles of the horizontal hinge shaft sensed by the two angle sensors is calculated. If the absolute value of the angle difference exceeds a predetermined angle, an emergency stop signal is output to the scraper conveyor start-stop device to stop the operation of the scraper, and an alarm signal is sent.

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