Middle chain scraper conveyor scraper defect and inclination fault detection device and method

Abstract

The invention provides a medium-chain scraper conveyor scraper defect and inclination fault detection device and method.The device comprises a mounting base, a fault detection mechanism, a deflector rod, a mechanical travel switch and a controller, in the operation process of the scraper conveyor, a scraper drives a main swing arm to swing, and when the main swing arm swings, a rubidium magnet on the inner side of the main swing arm passes through a Hall proximity switch, the rubidium magnet is driven to rotate; the Hall proximity switches can send signals to the controller, and the controller judges whether the scraper is inclined or damaged or not according to the time interval of the received signals of the two Hall switches and gives an alarm. The device has the advantages that the Hall proximity switch and the mechanical stroke sensor are adopted for monitoring, detection of faults such as over-inclination of the scraper, damage to the two sides of the scraper or missing of the whole scraper can be achieved, on one hand, sensor redundancy can be achieved, monitoring accuracy can be improved, and the situation that monitoring fails due to sensor misoperation, vibration deviation and the like is prevented; on the other hand, the action characteristics and the service life characteristics of the two sensors can be fully utilized, the Hall proximity switch is long in service life, and the mechanical stroke sensor is high in anti-electromagnetic interference capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of scraper conveyors, and particularly to a device and method for detecting the defects and inclination faults of the scraper of a medium-chain scraper conveyor. Background Art

[0002] At present, scraper conveyor equipment is widely used in the liquid supply fields such as coal mining and chemical industry. Especially in the coal mining industry, scraper conveyors with a length of hundreds of meters are commonly used. However, the operating environment of coal mining equipment is harsh, with serious dust and water spray, etc. The composition of the transported materials is complex and the particle size controllability is poor. Sometimes, gangue, ironware, etc. are mixed into the material system. At present, the state detection of scraper conveyors mainly focuses on the drive part and the electric control system, and its protection mainly includes functions such as torque limitation and current protection. The detection function for the integrity of the conveyor scraper is relatively lacking. At present, there are mainly methods such as X-ray and intelligent AI video monitoring. However, such monitoring methods often have problems of sensor failure in an environment with large dust, and due to the fast running speed of the conveyor and poor timeliness of detection and analysis, even if the scraper defect is found, it is often difficult to check the defect position during shutdown troubleshooting because the position is covered by materials. Summary of the Invention

[0003] The first object of the present invention is to provide a device for detecting the defects and inclination faults of the scraper of a medium-chain scraper conveyor.

[0004] The second object of the present invention is to provide a method for detecting the defects and inclination faults of the scraper of a medium-chain scraper conveyor.

[0005] The first object of the present invention is implemented by the following technical solution: A device for detecting defects and tilts of scraper conveyors in a medium-chain scraper conveyor, which includes a mounting base, a fault detection mechanism, a lever, a mechanical travel switch, and a controller. The mechanical travel switch arranged in the same direction as the conveying direction of the scraper conveyor is installed in the middle of the mounting base, and the middle of the lever is fixedly connected to the rocker arm of the mechanical travel switch; A fault detection mechanism is provided at each end of the mounting base. The fault detection mechanism includes a fixed frame, a connecting shaft, a main swing arm, a sub-swing arm, a return spring, and a Hall proximity switch. The bottom of the fixed frame is fixedly connected to the mounting base. A horizontally arranged connecting shaft is rotatably provided at the top of the fixed frame, and the connecting shaft is arranged perpendicular to the conveying direction of the scraper conveyor; The main swing arm is fixed to the outer end of the connecting shaft. The Hall proximity switch is installed at the lower part of the fixed frame. The bottom end of the main swing arm is suspended above the scraper conveyor, and the scraper of the scraper conveyor is in movable contact with the lower part of the main swing arm. A rubidium magnet corresponding to the Hall proximity switch is arranged at the inner center position of the main swing arm. A return spring is arranged between the middle of the main swing arm and the fixed frame; The sub-swing arm is fixed to the inner end of the connecting shaft. The sub-swing arms of the two fault detection mechanisms are respectively connected to the two ends of the lever through a synchronous spring in one-to-one correspondence; Both the mechanical travel switch and the Hall proximity switch are connected to the input end of the controller.

[0006] Further, an arc-shaped chute is provided at the lower part of the fixed frame. An installation plate for installing the Hall proximity switch is slidably arranged outside the arc-shaped chute. Two bolts are inserted through the installation plate, and the screw rods of the two bolts are slidably arranged inside the arc-shaped chute. Nuts that fit against the inner side of the arc-shaped chute are screwed onto the top ends of the bolts.

[0007] Further, two fixed rods arranged symmetrically about the connecting shaft are fixed to the top of the fixed frame, and a return spring is connected between each of the two fixed rods and the middle of the main swing arm.

[0008] Further, the fixed frame includes a frame-shaped rack and an L-shaped suspension plate. The frame-shaped rack is generally in a square shape with an opening direction along the conveying direction of the scraper conveyor; One side plate of the L-shaped suspension plate is fixedly connected to the top of the frame-shaped rack, and the other side plate of the L-shaped suspension plate is arranged opposite to the outer side plate of the frame-shaped rack; The middle of the connecting shaft is rotatably connected to the frame-shaped rack, and the outer end of the connecting shaft is rotatably connected to the other side plate of the L-shaped suspension plate through a bearing; The top end of the main swing arm is fixedly connected to the connecting shaft between the frame-shaped rack and the other side plate of the L-shaped suspension plate; The return spring is arranged between the frame-shaped rack and the main swing arm.

[0009] Furthermore, reinforcing rods are fixed between both sides of the other side plate of the L-shaped suspension plate and the frame-shaped rack.

[0010] The second object of the present invention is implemented by the following technical solution: A method for detecting defects and tilting faults of scraper plates in a medium-chain scraper conveyor. During the operation of the scraper conveyor, the scraper plate drives the main swing arm to swing. When the rubidium magnet inside the main swing arm passes by the Hall proximity switch during the swing of the main swing arm, the Hall proximity switch sends a signal to the controller. The controller determines whether the scraper plate is tilted or defective and issues an alarm based on the time interval between the two Hall switch signals received and the mechanical proximity switch signal. Specifically: Set the standard time difference for two adjacent scraper plates before and after in the scraper conveyor passing through the main swing arm as T 0， The time difference for the scraper plate to trigger the Hall proximity switches on both sides when passing through the two main swing arms is T 1， The actual time interval between the front and rear two scraper plates triggering the Hall proximity switches is T2; when 50 ms < T1 ≤ 0.5T0, an alarm for scraper plate tilt is issued; when 0.5T0 < T1 ≤ 0.8T0, an alarm for a defect on one side of the scraper plate is issued; when 2T0 ≤ T2, an alarm for defects on both sides of the scraper plate is issued; In addition, when the scraper plate is tilted or defective, the mechanical travel switch will send a displacement signal S1. When V * 50 ms < S1 ≤ 0.5V * T 0， An alarm for scraper plate tilt is issued; when 0.5V * T0 < S1 ≤ 0.8V * T0, an alarm for a defect on one side of the scraper plate is issued; where V is the rated operating speed of the scraper conveyor.

[0011] Furthermore, T0 = V / S, where V is the rated operating speed of the scraper conveyor and S is the normal installation spacing of the scraper plates.

[0012] Advantages of the present invention: The present invention uses a dual-sensor monitoring of Hall proximity switches and mechanical travel sensors, which can detect faults such as scraper plate tilt, damage to both sides of the scraper plate, or overall loss of the scraper plate. On the one hand, it can achieve sensor redundancy, improve the monitoring accuracy, and prevent situations where the sensors malfunction, vibrate and shift, resulting in monitoring failures; on the other hand, it can make full use of the action characteristics and service life characteristics of the two sensors. Among them, the Hall proximity switch has a long action life, while the mechanical travel sensor has strong anti-electromagnetic interference ability. The application of the present invention can effectively avoid faults such as chain loosening, scraper plate tilt, and scraper plate damage caused by scraper plate defects during the operation of scraper conveyors in harsh operating environments and equipment that moves at any time in the mining field, etc., and has good economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2is Figure 1 the left view of

[0015] Figure 3 is Figure 1 the front view of

[0016] Figure 4 the schematic diagram of the usage state of the present invention

[0017] Installation base 1, fault detection mechanism 2, fixing frame 21, connecting shaft 22, main swing arm 23, auxiliary swing arm 24, return spring 25, Hall proximity switch 26, arc-shaped chute 27, mounting plate 28, bolt 29, nut 210, fixing rod 211, frame-shaped machine frame 213, L-shaped suspension plate 214, strengthening rod 215, lever 3, mechanical travel switch 4, rocker arm 41, controller 5, scraper conveyor 6, scraper 61, rubidium magnet 7, synchronous spring 8 Specific implementation manner

[0018] In the description of the present invention, it should be noted that when terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention. In addition, when terms such as "first", "second", "third" appear, they are only for descriptive purposes and cannot be understood as indicating or implying relative importance

[0019] Embodiment 1: As Figures 1 to 4 shown, a device for detecting defects and tilting faults of the scraper of a medium-chain scraper conveyor. The whole detection device is arranged above the tail section of the scraper conveyor 6 or the head section of the cross-side unloading conveyor through a bracket. This section area is the empty material section of the conveyor and there is no material covering during daily operation. It includes an installation base 1, a fault detection mechanism 2, a lever 3, a mechanical travel switch 4 and a controller 5. A fault detection mechanism 2 is respectively arranged at both ends of the installation base 1. The fault detection mechanism 2 includes a fixing frame 21, a connecting shaft 22, a main swing arm 23, an auxiliary swing arm 24, a return spring 25 and a Hall proximity switch 26. The bottom of the fixing frame 21 is fixedly connected to the installation base 1. A horizontally arranged connecting shaft 22 is rotatably provided at the top of the fixing frame 21, and the connecting shaft 22 is arranged perpendicular to the conveying direction of the scraper conveyor 6. A main swing arm 23 is fixed at the outer end of the connecting shaft 22. The bottom end of the main swing arm 23 is suspended above the scraper conveyor 6, and the scraper 61 of the scraper conveyor 6 is in movable contact with the lower part of the main swing arm 23. When the scraper of the scraper conveyor 6 moves forward past the main swing arm 23, it will collide with the main swing arm 23 and cause it to rotate

[0020] A Hall proximity switch 26 is installed at the lower part of the fixed frame 21. An arc-shaped sliding groove 27 is provided at the lower part of the fixed frame 21. An installation plate 28 for installing the Hall proximity switch 26 is slidably arranged outside the arc-shaped sliding groove 27. Two bolts 29 are inserted through the installation plate 28. The screw rods of the two bolts 29 are slidably arranged inside the arc-shaped sliding groove 27. A nut 210 that fits against the inner side of the arc-shaped sliding groove 27 is screwed onto the top of the bolt 29. The distance between the Hall proximity switch 26 and the main swing arm 23 can be adjusted according to the spacing of the scraper 61 of different scraper conveyors 6. Specifically, when adjustment is needed, first loosen the nut 210, and the relative position of the installation plate 28 and the arc-shaped sliding groove 27 can be adjusted. After adjustment in place, tighten the nut 210.

[0021] A rubidium magnet 7 corresponding to the Hall proximity switch 26 is arranged at the inner center position of the main swing arm 23. A return spring 25 is arranged between the middle part of the main swing arm 23 and the fixed frame 21. Two fixed rods 211 symmetrically arranged about the connecting shaft 22 are fixed at the top of the fixed frame 21. A return spring 25 is respectively connected between the two fixed rods 211 and the middle part of the main swing arm 23. After the main swing arm 23 finishes swinging, the two return springs 25 act together, one pushing and the other pulling, which can make the main swing arm 23 quickly return to its original position, avoid the swinging problem of the main swing arm 23 caused by the unilateral spring return, and improve the stability of the operation of the detection device.

[0022] A secondary swing arm 24 is fixed at the inner end of the connecting shaft 22. When the main swing arm 23 rotates, it will drive the secondary swing arm 24 to rotate synchronously through the connecting shaft 22. A mechanical travel switch 4 arranged in the same direction as the conveying direction of the scraper conveyor 6 is installed in the middle of the installation base 1. The middle part of the dial rod 3 is fixedly connected to the rocker arm 41 of the mechanical travel switch 4. The secondary swing arms 24 of the two fault detection mechanisms 2 are respectively connected to the two ends of the dial rod 3 through a synchronous spring 8 in one-to-one correspondence. When the scraper 61 is not tilted or damaged, the two main swing arms 23 can be driven to swing simultaneously, and then drive the two secondary swing arms 24 to stretch the two synchronous springs 6 at the same time. The pulling forces on both sides of the dial rod 3 are balanced, and the mechanical travel switch 4 will not be triggered. When the scraper 61 is tilted or damaged, only one of the two synchronous springs 6 is stretched or the stretching deformations of the two synchronous springs 6 are inconsistent (when tilted), then the dial rod 3 will lose balance and deflect, so that the travel sensor 13 is triggered to act. Both the mechanical travel switch 4 and the Hall proximity switch 26 are connected to the input end of the controller 5. After the mechanical travel switch 4 and the Hall proximity switch 26 trigger signals, they are transmitted to the controller 5.

[0023] Working principle: After the scraper conveyor 6 is started and running, the scraper 61 starts to run towards the head along with the chain; when the scraper 61 runs below this device, the scraper 61 will collide with the two main swing arms 23. When the main swing arms 23 swing, on the one hand, it can drive the rubidium magnet 7 to move, trigger the Hall proximity switch 26 to output an action signal, and the action signal is transmitted to the controller 5; if the controller 5 synchronously receives the Hall proximity switch 26 signals of the two fault detection mechanisms 2 or the time difference received is small (less than 50 ms), it indicates that the currently detected scraper 61 has no tilt and no defect; on the contrary, if the time interval between the Hall proximity switch 26 signals received by the two fault detection mechanisms 2 is too large, it indicates that the currently detected scraper is tilted or defective and needs to be repaired in time; On the other hand, when the main swing arms 23 swing, they can drive the secondary swing arms 24 to swing synchronously. When the secondary swing arms 24 swing, they can pull the rope synchronization spring 8; if the controller 5 does not receive the signal that the mechanical travel switch 4 is triggered, it indicates that the pulling forces of the two synchronization springs 8 on the lever 3 have reached balance and the detected scraper has no tilt or defect; if the controller 5 receives the signal sent by the mechanical travel switch 4, it indicates that the lever 3 has swung, the pulling forces of the two side synchronization springs 8 are not synchronous, and the detected scraper 61 is tilted or defective.

[0024] In addition, in order to improve the stability of the swing of the main swing arms 23, the fixing frame 21 includes a frame-shaped machine frame 213 and an L-shaped hanging plate 214. The frame-shaped machine frame 213 is generally in a square shape with its opening direction arranged along the conveying direction of the scraper conveyor 6; one side plate of the L-shaped hanging plate 214 is fixedly connected to the top of the frame-shaped machine frame 213, and the other side plate of the L-shaped hanging plate 214 is arranged opposite to the outer side plate of the frame-shaped machine frame 213; the middle of the connecting shaft 22 is rotationally connected to the frame-shaped machine frame 213, and the outer end of the connecting shaft 22 is rotationally connected to the other side plate of the L-shaped hanging plate 214 through a bearing; the top end of the main swing arm 23 is fixedly connected to the connecting shaft 22 between the frame-shaped machine frame 213 and the other side plate of the L-shaped hanging plate 214; the return spring 25 is arranged between the frame-shaped machine frame 213 and the main swing arm 23. That is, the connecting shaft 22 is supported at three points by the two sides of the frame-shaped machine frame 213 and the other side plate of the L-shaped hanging plate 214, avoiding the deflection deformation of the outer end of the connecting shaft 22 and extending the service life of the equipment. Reinforcing rods 215 are fixed between the two sides of the other side plate of the L-shaped hanging plate 214 and the frame-shaped machine frame 213, and the stability of the connection between the two can be enhanced through the reinforcing rods 215.

[0025] Embodiment 2: Detection method of the detection device for the defect and inclination of the scraper of the medium-chain scraper conveyor based on Embodiment 1. During the operation of the scraper conveyor, the scraper will drive the main swing arm 23 to swing. When the rubidium magnet inside the main swing arm 23 passes by the Hall proximity switch during the swing of the main swing arm 23, the Hall proximity switch will send a signal to the controller. The controller judges whether the scraper is inclined or defective and issues an alarm according to the time interval between the two received Hall switch signals and the mechanical proximity switch signal. Specifically: Set the standard time difference for the detection of two adjacent scrapers in the front and back of the scraper conveyor passing through the main swing arm as T0; The time difference for the two sides of the Hall proximity switch 26 to be triggered when the scraper passes through the two main swing arms 23 is T1; When 50 ms < T1 ≤ 0.5T0, an alarm for scraper inclination is issued; When 0.5T0 < T1 ≤ 0.8T0, an alarm for the defect of one side of the scraper is issued; When 2T0 ≤ T2, an alarm for the defect of both sides of the scraper is issued.

[0026] In addition, when the scraper is inclined or defective, the mechanical limit switch 4 will send a displacement signal S1. When V * 50 ms < S1 ≤ 0.5V * T 0， An alarm for scraper inclination is issued; When 0.5V * T0 < S1 ≤ 0.8V * T0, an alarm for the defect of one side of the scraper is issued; Wherein, V is the rated operating speed of the scraper conveyor 6.

[0027] T0 = V / S, where V is the rated operating speed of the scraper conveyor 6 and S is the normal installation spacing of the scrapers.

[0028] Finally, it should be noted that: The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for detecting scraper defect and tilt fault of a chain scraper conveyor, characterized in that: The invention comprises a mounting base, a fault detection mechanism, a shift lever, a mechanical travel switch and a controller. The mechanical travel switch arranged in the same direction as the conveying direction of the scraper conveyor is installed in the middle of the mounting base, and the middle part of the shift lever is fixedly connected to the rocker arm of the mechanical travel switch; one fault detection mechanism is respectively provided at both ends of the mounting base, and the fault detection mechanism comprises a fixing frame, a connecting shaft, a main swing arm, an auxiliary swing arm, a reset spring and a Hall proximity switch. The bottom of the fixing frame is fixedly connected to the mounting base, and the connecting shaft arranged transversely is rotatably provided on the top of the fixing frame, and the connecting shaft is arranged perpendicular to the conveying direction of the scraper conveyor; the main swing arm is fixed at the outer end of the connecting shaft, and the Hall proximity switch is installed at the lower part of the fixing frame. The bottom end of the main swing arm is suspended above the scraper conveyor, and the scraper of the scraper conveyor is in active contact with the lower part of the main swing arm. A rubidium magnet corresponding to the Hall proximity switch is provided at the inner center position of the main swing arm, and a reset spring is provided between the middle part of the main swing arm and the mounting frame. The auxiliary swing arm is fixed to the inner end of the connecting shaft, and the auxiliary swing arms of the two fault detection mechanisms are respectively connected to the two ends of the shift rod one by one through a synchronization spring; the mechanical travel switch and the Hall proximity switch are both connected to the input end of the controller.

2. The chain scraper conveyor scraper defect and inclination fault detection device according to claim 1, characterized in that An arc-shaped slide groove is provided at the lower part of the fixing frame, and a mounting plate for mounting the Hall proximity switch is slidably provided on the outer side of the arc-shaped slide groove. Two bolts are passed through the mounting plate, and the screw rods of the two bolts are slidably provided inside the arc-shaped slide groove. A nut that fits the inner side of the arc-shaped slide groove is screwed on the top end of the bolt.

3. The scraper defect and inclination fault detection device for a medium-chain scraper conveyor according to claim 1, characterized in that, Two fixing rods symmetrically arranged about the connecting axis are fixed on the top of the fixing frame, and a reset spring is respectively connected between the two fixing rods and the middle part of the main swing arm.

4. The chain scraper conveyor scraper defect and inclination fault detection device according to claim 1, characterized in that The fixed frame includes a frame frame and an L-shaped suspension plate, the frame frame is in a U-shape as a whole, and its opening direction is arranged along the conveying direction of the scraper conveyor; one side plate of the L-shaped suspension plate is fixedly connected to the top of the frame frame, and the other side plate of the L-shaped suspension plate is arranged opposite to the outer side plate of the frame frame; the middle part of the connecting shaft is rotatably connected to the frame frame, and the outer end of the connecting shaft is rotatably connected to the other side plate of the L-shaped suspension plate through a bearing; the top end of the main swing arm and the connecting shaft between the frame frame and the other side plate of the L-shaped suspension plate are fixedly connected; the return spring is arranged between the frame frame and the main swing arm.

5. The chain scraper conveyor scraper defect and inclination fault detection device according to claim 4, characterized in that Reinforcement rods are fixed between the two sides of the other side plate of the L-shaped suspension plate and the frame-type rack.

6. A detection method for a detection device of the defects and inclination faults of the scraper of a medium chain scraper conveyor according to claims 1 to 5, characterized in that, During the operation of the scraper conveyor, the scraper will drive the main swing arm to swing. When the rubidium magnet inside the main swing arm passes the Hall proximity switch, the Hall proximity switch will send a signal to the controller. The controller will determine whether the scraper is tilted or damaged based on the time interval of the two received Hall switch signals and the mechanical proximity switch signal and issue an alarm. Specifically, the detection standard time difference between the two adjacent scrapers of the scraper conveyor passing the main swing arm is set to T 0， When the scraper passes through the two main swing arms, the time difference between the Hall proximity switches on both sides is T 1， The actual time interval between the front and rear scrapers triggering the Hall proximity switch is T2; when 50ms<T1≤0.5T0, a scraper tilt alarm is issued; when 0.5T0<T1≤0.8T0, a scraper side defect alarm is issued; when 2T0≤T2, a scraper side defect alarm is issued; In addition, when the scraper is tilted or damaged, the mechanical travel switch will send a displacement signal S1. When V * 50 ms < S1 ≤ 0.5V * T 0， a scraper tilt alarm is issued; when 0.5V * T0 < S1 ≤ 0.8V * T0, a defect alarm on one side of the scraper is issued; where V is the rated operating speed of the scraper conveyor.

7. A method for detecting scraper defect and tilt fault of a chain scraper conveyor according to claim 6, characterized in that: T0=V / S, where V is the rated speed of the scraper conveyor and S is the normal installation spacing of the scraper.

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