Self-checking device and self-checking method for deviation of conveying belt in belt conveyor

Abstract

The invention relates to the field of deviation detection of conveying belts, in particular to a deviation self-detection device and method for a conveying belt in a belt conveyor. The device comprises a deviation detection mechanism, a self-checking mechanism, an adjusting mechanism and a central controller, the deviation detection mechanism comprises a shell, a mounting shaft rotationally arranged on the shell, a second gear and a cam assembly which are arranged on the mounting shaft, a connecting frame and a switch frame which are arranged on the shell, a rotating frame with a first connecting arm and a second connecting arm, and a first roller rotationally arranged at the outer end of the first connecting arm; the second roller is rotatably arranged at the outer end of the second connecting arm; the travel switch is arranged on the switch frame; the limiting plate is rotatably arranged on the shell; the two ends of the tension spring are connected with the limiting plate and the shell respectively; the device can be triggered by the off-tracking conveying belt to give an alarm, has a self-checking function, has an effective conveying belt off-tracking detection effect, and avoids false alarm.

Description

Technical Field

[0001] The present invention relates to the field of conveyor belt deviation detection, and particularly to a self-checking device and a self-checking method for conveyor belt deviation in a belt conveyor. Background Art

[0002] A belt conveyor is a mechanical device that uses friction drive to continuously transport materials. It can transport materials from the initial feeding point to the final discharging point on a conveyor line over a certain distance, realizing the transportation of materials. During the operation of the belt conveyor, the conveyor belt may deviate. After the conveyor belt deviates, it will affect the material transportation process. Therefore, there is a need to detect the deviation of the conveyor belt.

[0003] Chinese Patent Publication No. CN215591822U discloses a conveying device for coal mines, including a transfer machine. One end of the transfer machine is lapped with the self-propelled tail of the belt conveyor. A jack is provided under the head of the transfer machine. Roller frames for fixedly connecting the upper rollers and the bottom rollers are provided on both sides of the self-propelled tail of the belt conveyor. The upper rollers and the bottom rollers support the conveyor belt. Guide wheels are installed on the upper part of the roller frame, and vertical rollers are installed on the bottom rollers. An anti-deviation mechanism is installed at the belt outlet of the self-propelled tail of the belt conveyor. This conveying device restricts the conveyor belt within a certain deviation range through the guide wheels; by installing the anti-deviation mechanism, when the conveyor belt deviates, the conveyor belt can be corrected.

[0004] However, the above technical solution has the following deficiencies: It is unable to monitor the deviation situation of the conveyor belt and cannot timely grasp whether the deviation degree of the conveyor belt exceeds the deviation range. Summary of the Invention

[0005] The object of the present invention is to address the problems in the background art and propose a self-checking device and a self-checking method for conveyor belt deviation in a belt conveyor, which can be triggered by the conveyor belt to give an alarm when the conveyor belt deviates, and has a self-checking function to ensure that the device has an effective conveyor belt deviation detection function and avoid false alarms.

[0006] On the one hand, the present invention provides a self-checking device for belt deviation of a belt conveyor, which includes a deviation detection mechanism, a self-checking mechanism, an adjustment mechanism and a central controller; the deviation detection mechanism includes a housing, a mounting shaft rotatably arranged on the housing, a second gear and a cam assembly coaxially arranged on the mounting shaft from top to bottom, a connecting frame and a switch frame arranged on the housing, a rotating frame rotatably arranged on the connecting frame and having a first connecting arm and a second connecting arm, a first roller rotatably arranged at the outer end of the first connecting arm, a second roller rotatably arranged at the outer end of the second connecting arm, a travel switch arranged on the switch frame and having a contact in contact with the second roller, a limiting plate rotatably arranged on the housing and located on one side of the second roller, a tension spring with two ends respectively connected to the limiting plate and the housing, a triggering assembly that triggers the rotation of the second gear when the belt deviation distance reaches a preset value, and an alarm arranged on the housing. The length of the first connecting arm is greater than that of the second connecting arm, and the first roller is located on one side of the cam assembly; the self-checking mechanism is used to detect whether the travel switch and the alarm are faulty; the adjustment mechanism is used to adjust the position of the deviation detection mechanism; the central controller is communicatively connected to the travel switch and is control-connected to the alarm, the self-checking mechanism and the adjustment mechanism.

[0007] Preferably, the triggering assembly includes a screw rod rotatably arranged on the housing, a triggering platform threadedly connected to the screw rod, a top platform arranged at the top end of the screw rod, a first gear arranged at the bottom end of the screw rod, and a limiting platform arranged on the top of the housing and located below the triggering platform. The triggering platform includes a cylindrical portion and a frustum-shaped portion integrally formed from top to bottom. The diameter of the top end of the frustum-shaped portion is equal to the diameter of the cylindrical portion, and the diameter of the bottom end of the frustum-shaped portion is smaller than the diameter of the top end. The first gear is meshed and connected with the second gear.

[0008] Preferably, a first electric push rod is arranged in the housing, and the moving end of the first electric push rod is connected with an abutting platform, and the abutting platform faces the screw rod.

[0009] Preferably, a second torsion spring located on the outer periphery of the screw rod is connected between the top end of the housing and the bottom end of the triggering platform.

[0010] Preferably, the adjustment mechanism adjusts the triggering platform to the initial positioning position and the detection position successively. When the triggering platform is in the initial positioning position, the top end of the triggering platform fits against the upper side surface of the conveyor belt. When the triggering platform is in the detection position, the upper side surface of the conveyor belt faces the frustum-shaped portion of the triggering platform.

[0011] Preferably, the self-inspection mechanism includes a mounting bracket, a second electric push rod disposed inside the housing and driving the mounting bracket to move linearly, a first motor disposed on the mounting bracket, a fourth gear connected to the output end of the first motor, a first rotating shaft and a second rotating shaft rotatably disposed on the mounting bracket, a fifth gear disposed on the first rotating shaft and meshed with the fourth gear, an incomplete gear disposed on the first rotating shaft, a sixth gear and a connecting ring coaxially disposed on the second rotating shaft, and a first torsion spring sleeved on the outer peripheral side of the second rotating shaft and connected to the connecting ring and the mounting bracket at both ends. The incomplete gear has the same diameter as the second gear, and the third gear and the sixth gear have the same diameter.

[0012] Preferably, the side surface of the housing has a mounting opening. Four corners of the mounting opening respectively have two positioning holes and two threaded holes distributed crosswise. The housing is detachably connected with a housing cover. The housing cover has two positioning columns and two through holes distributed crosswise. The positioning columns are adapted to the positioning holes, and bolts threadedly connected with the threaded holes are disposed through the through holes.

[0013] On the other hand, the present invention provides a method for self-inspecting the deviation of a conveyor belt in a belt conveyor, which is implemented by the above-mentioned device for self-inspecting the deviation of a conveyor belt in a belt conveyor. The method includes the following steps:

[0014] S1. Install the adjusting mechanism on the frame of the belt conveyor;

[0015] S2. Before detecting whether the deviation distance of the conveyor belt reaches a preset value, the adjusting mechanism first adjusts the trigger platform to the initial positioning position. The circumferential surface of the cylindrical part of the trigger platform fits with the upper side surface of the conveyor belt, and then the trigger platform is adjusted to the detection position, and the upper side surface of the conveyor belt faces the frustum part of the trigger platform;

[0016] S3. When the conveyor belt deviates, the conveyor belt gradually shifts towards the trigger platform until it contacts the trigger platform. The conveyor belt drives the trigger platform to rotate. The trigger platform screws down obliquely on the screw rod. The frustum part of the trigger platform moves downward along the inclined direction and presses on the upper surface of the upper part of the conveyor belt. At the contact point, the conveyor belt deforms, increasing the contact area. The conveyor belt drives the screw rod to rotate through the trigger platform, the screw rod drives the first gear to rotate, the first gear drives the second gear to rotate, the second gear drives the cam assembly to rotate through the mounting shaft, and the cam assembly pushes the contact head of the travel switch to rotate through the first roller, the rotating frame and the second roller. After the cam assembly turns away from the first roller, the contact head resets;

[0017] S4. The travel switch sends a signal to the central controller, and the central controller controls the alarm to give an alarm;

[0018] S5. When the conveyor belt is in a non-deviating state, the self-checking mechanism detects whether the travel switch and the alarm are faulty. During self-checking, the second electric push rod drives the mounting frame to move forward, so that the incomplete gear meshes with the second gear, and the sixth gear meshes with the third gear. The first motor is started, and the first motor drives the incomplete gear to rotate through the fourth gear, the fifth gear and the first rotating shaft. The incomplete gear drives the second gear to rotate. The second gear drives the cam assembly and the third gear to rotate through the mounting shaft. The third gear drives the first torsion spring to twist through the sixth gear, the second rotating shaft and the connecting ring. The cam assembly pushes the contact of the travel switch to rotate through the first roller, the rotating frame and the second roller. After the cam assembly disengages from the first roller, the contact resets. After the incomplete gear disengages from the second gear, the first torsion spring drives the connecting ring to reverse, and the cam assembly rotates in the reverse direction and resets.

[0019] S6. If the alarm sounds, the travel switch and the alarm are fault-free. If the alarm does not sound, at least one of the travel switch and the alarm is faulty.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] The present invention can be triggered by the conveyor belt to give an alarm when the conveyor belt deviates, and has a self-checking function, ensuring that the device has an effective function of detecting conveyor belt deviation, avoiding false alarms, and having high reliability of detection results. When the conveyor belt does not deviate, the self-checking mechanism self-checks the device, and when the alarm cannot be triggered to sound, the relevant parts are repaired in time. In addition, the normal operation of the belt conveyor will not be affected during self-checking. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the main view structural sectional view of the embodiment of the present invention applied to the detection of conveyor belt deviation;

[0023] Figure 2 is Figure 1 the enlarged view of the structure at A in

[0024] Figure 3 It is the partial structural sectional view of the embodiment of the present invention;

[0025] Figure 4 It is the partial structural schematic diagram of the embodiment of the present invention for detecting conveyor belt deviation;

[0026] Figure 5 It is the partial structural sectional view of the self-checking part of the embodiment of the present invention;

[0027] Figure 6 It is the exploded view of the structure of the housing and the housing cover.

[0028] Reference numerals: 100, conveyor belt; 200, frame; 1, housing; 101, positioning hole; 102, threaded hole; 111, housing cover; 1111, positioning post; 1112, through hole; 2, screw; 3, trigger platform; 4, top platform; 5, limiting platform; 6, first gear; 7, abutting platform; 8, first electric push rod; 9, mounting shaft; 10, second gear; 11, first cam; 12, second cam; 13, third gear; 14, connecting frame; 15, rotating frame; 16, first roller; 17, second roller; 18, travel switch; 19, switch frame; 20, limiting plate; 201, tension spring; 21, mounting frame; 22, first motor; 23, fourth gear; 24, fifth gear; 25, first rotating shaft; 26, incomplete gear; 27, sixth gear; 28, second rotating shaft; 281, connecting ring; 29, first torsion spring; 30, second electric push rod; 31, battery; 32, lifting housing; 33, second motor; 34, first lead screw; 341, first lead screw nut; 35, first guide rod; 36, moving table; 37, mounting cover; 38, second lead screw; 381, second lead screw nut; 39, second guide rod; 40, lifting table; 41, fixing frame; 42, second torsion spring. Detailed implementation manners

[0029] Embodiment 1

[0030] As Figures 1-6 shown, a device for self-checking the deviation of a conveyor belt in a belt conveyor proposed in this embodiment includes a deviation detection mechanism, a self-checking mechanism, an adjustment mechanism, and a central controller. For a belt conveyor for coal transportation with multiple rollers, the rollers are rotatably installed on the frame 200, including rollers that are inclined outward on both sides of the upper part, and multiple such inclined rollers are arranged side by side on both sides. The conveyor belt 100 is sleeved on multiple rollers, the upper part of the conveyor belt 100 is arc-shaped, and the lower part is straight. The upper part of the conveyor belt 100 moves from the Figure 1 rear side to the front side in Figure 2 the enlarged view. The device for self-checking the deviation shown in the enlarged view is located at the rear side. This device is arranged near the outermost inclined roller, that is, near the starting point and the ending point of the conveyor. A total of four are set, and the two devices on the left and the two devices on the right are symmetrically distributed. Specifically, they are inclined and arranged on the frame 200 of the belt conveyor and are located on the side of the upper part of the conveyor belt 100.

[0031] The deviation detection mechanism includes a housing 1, a mounting shaft 9 rotatably arranged on the housing 1, a second gear 10 and a cam assembly coaxially arranged on the mounting shaft 9 from top to bottom, a connecting frame 14 and a switch frame 19 arranged on the housing 1, a rotating frame 15 rotatably arranged on the connecting frame 14 and having a first connecting arm and a second connecting arm, a first roller 16 rotatably arranged at the outer end of the first connecting arm, a second roller 17 rotatably arranged at the outer end of the second connecting arm, a travel switch 18 arranged on the switch frame 19 with its contact in contact with the second roller 17, a limiting plate 20 rotatably arranged on the housing 1 and located on one side of the second roller 17, a tension spring 201 with both ends connected to the limiting plate 20 and the housing 1 respectively, a triggering assembly for triggering the rotation of the second gear 10 when the deviation distance of the conveyor belt 100 reaches a preset value, and an alarm arranged on the housing 1. The length of the first connecting arm is greater than that of the second connecting arm. Using the lever principle, the cam assembly is more likely to drive the rotation of the rotating frame 15 by pushing the first roller 16, thereby driving the second roller 17 to push away the contact of the travel switch 18. The first roller 16 is located on one side of the cam assembly. The limiting plate 20 is used to limit the movement range of the second roller 17. The limiting plate 20 can also be an elastic plate, and after being pushed away, it can be reset by using the damping of the rotational connection between the limiting plate 20 and the housing 1 and the tension spring 201, so as to reset the second roller 17.

[0032] The triggering assembly includes a screw 2 rotatably arranged on the housing 1, a triggering platform 3 threadedly connected to the screw 2, a top platform 4 arranged at the top end of the screw 2, a first gear 6 arranged at the bottom end of the screw 2, and a limiting platform 5 arranged on the top of the housing 1 and located below the triggering platform 3. The lower part of the screw 2 is a smooth rod and can be rotatably installed on the top of the housing 1. The upper part of the screw 2 is a right-handed threaded part. After threadedly connecting the triggering platform 3 to the threaded part, the top platform 4 is connected to the top of the screw 2. The top platform 4 can be welded to the screw 2 or adhered by glue. The triggering platform 3 includes a cylindrical part and a frustum part integrally formed from top to bottom. The diameter of the top end of the frustum part is equal to the diameter of the cylindrical part, the diameter of the bottom end of the frustum part is smaller than the top end diameter, and the side surface of the frustum part is inclined downward. The first gear 6 is meshed and connected with the second gear 10.

[0033] When the conveyor belt 100 deviates and contacts with the trigger platform 3, it can drive the trigger platform 3 to rotate. The trigger platform 3 drives the second gear 10 to rotate through the screw 2 and the first gear 6. The second gear 10 drives the cam assembly to rotate through the mounting shaft 9. However, the cam assembly is not sufficient to push the contact of the travel switch 18 through the first roller 16, the rotating frame 15 and the second roller 17, that is, the contact will prevent the screw 2 from continuing to rotate. As the conveyor belt 100 continues to move, the trigger platform 3 will rotate obliquely downward on the screw 2 and compress the conveyor belt 100 to deform. At this time, there is surface contact between the trigger platform 3 and the conveyor belt 100, and the contact area between the trigger platform 3 and the conveyor belt 100 increases, and the friction force increases. A greater torque can be applied to the screw 2 through the trigger platform 3, which is more conducive to the cam assembly to trigger the contact of the travel switch 18 through the first roller 16, the rotating frame 15 and the second roller 17, which is a labor-saving lever. When the contact area between the trigger platform 3 and the conveyor belt 100 is insufficient, the friction force is insufficient to realize the second roller 17 to move the contact of the travel switch 18 through the power of the conveyor belt 100 .

[0034] The central controller is connected to the travel switch 18 for communication, and is connected to the alarm, self-test mechanism and adjustment mechanism for control. After the cam assembly triggers the contact of the travel switch 18 through the first roller 16, the rotating frame 15 and the second roller 17, the central controller controls the alarm to sound an alarm and shut down the belt conveyor. During this period, the conveyor belt 100 has not yet been able to change from surface contact to line contact or disengage contact under the reverse pushing action of the truncated cone of the triggering platform 3, that is, the conveyor belt 100 and the triggering platform 3 still maintain surface contact, and this period of time is sufficient for the deviation alarm.

[0035] When the conveyor belt 100 drives the triggering platform 3 to rotate, the resistance of the triggering platform 3 to drive the screw 2 to rotate can be adjusted to achieve another triggering method: the conveyor belt 100 first rotates the triggering platform 3 downward into place, and then drives the screw 2 to rotate. The structure and principle of adjusting the resistance are as follows: a first electric push rod 8 is arranged in the housing 1, and the moving end of the first electric push rod 8 is connected to the abutment platform 7, and the abutment platform 7 faces the screw 2. The force applied by the first electric push rod 8 on the abutment platform 7 is adjustable, and the degree of tightness of the abutment platform 7 on the screw 2 is adjustable. The higher the degree of tightness, the greater the resistance to the rotation of the screw 2. When adjusting the rotation resistance of the screw 2, do not adjust the rotation resistance too large, so that the conveyor belt 100 can first rotate the triggering platform 3 downward to the area in contact with the conveyor belt 100 to achieve sufficient friction, and then the triggering platform 3 driven by the conveyor belt 100 can further drive the screw 2 to rotate, and finally achieve the triggering of the travel switch 18 contacts.

[0036] The self-checking mechanism is used to detect whether the travel switch 18 and the alarm are faulty, and the self-checking mechanism is used to perform regular inspections to ensure the normal use of the device. When the self-checking mechanism is not needed to perform self-inspection on the device, the self-inspecting mechanism does not interfere with the deviation detection mechanism for the conveyor belt 100.

[0037] For the cam assembly, the cam assembly includes a first cam 11 and a second cam 12. The protruding parts of the first cam 11 and the second cam 12 are distributed in a staggered manner. For example, they are staggered by 80 degrees, which can successively push the first roller 16, and successively push the contact of the travel switch 18 through the second roller 17, and can trigger two alarm signals successively. When the second trigger occurs, the central controller will also control the belt conveyor to stop running.

[0038] The adjusting mechanism is used to adjust the position of the deviation detection mechanism. The adjusting mechanism adjusts the trigger platform 3 to the initial positioning position and the detection position successively. Both of these positions are defined relative to the conveyor belt 100. When the trigger platform 3 is in the initial positioning position, the trigger platform 3 is in contact with the upper side of the conveyor belt 100. Specifically, the circumferential surface of the cylindrical part of the trigger platform 3 is in contact with the upper side of the conveyor belt 100. When the trigger platform 3 is adjusted from the initial positioning position to the detection position, as Figure 2 shown, the upper side of the conveyor belt 100 faces the outer peripheral surface of the frustum part of the trigger platform 3, and there is a gap between the upper side of the conveyor belt 100 and the frustum part of the trigger platform 3. When the upper part of the conveyor belt 100 runs off to one side in the inclined upward direction and contacts the trigger platform 3, it will trigger the second gear 10 to rotate through the trigger assembly, and use the cam assembly, the first roller 16, the rotating frame 15 and the second roller 17 to push open the contact of the travel switch 18.

[0039] The specific structure and principle of the adjusting mechanism are described below. The adjusting mechanism includes an offset adjusting component and a lifting component. The offset adjusting component includes a lifting shell 32, a second motor 33 arranged in the lifting shell 32, a first lead screw 34 connected to the output end of the second motor 33 and rotatably arranged in the lifting shell 32, a first lead screw nut 341 threadedly connected to the first lead screw 34, a first guide rod 35 parallel to the first lead screw 34 and arranged in the lifting shell 32, and a moving platform 36 connected to the first lead screw nut 341 and slidably arranged on the first guide rod 35. The moving platform 36 is arranged at the bottom of the housing 1. By driving the first lead screw 34 to rotate through the second motor 33, the first lead screw 34 drives the first lead screw nut 341 to move, the first lead screw nut 341 drives the moving platform 36 to move, and the first guide rod 35 plays a guiding role. The moving platform 36 can drive the housing 1 to move. When the deviation self-checking device is inclined, the housing 1 can be adjusted along the inclined direction, that is, in the direction of approaching or departing from the upper side of the conveyor belt 100.

[0040] The lifting assembly includes a fixed frame 41, a mounting cover 37 provided on the fixed frame 41, a third motor provided in the mounting cover 37, a second lead screw 38 connected to the output end of the third motor and rotatably provided in the mounting cover 37, a second lead screw nut 381 threadedly connected to the second lead screw 38, a second guide rod 39 provided in the mounting cover 37, and a lifting platform 40 connected to the second lead screw nut 381 and slidably provided on the second guide rod 39. The lifting platform 40 penetrates through the top of the mounting cover 37 and is provided at the bottom of the lifting housing 32. The second lead screw 38 is perpendicular to the first lead screw 34. The fixed frame 41 is provided on the frame 200 of the conveyor. The third motor can drive the second lead screw 38 to rotate, the second lead screw 38 drives the second lead screw nut 381 to move, the second lead screw nut 381 drives the lifting platform 40 to move, the second guide rod 39 guides the lifting platform 40, and the lifting platform 40 drives the lifting housing 32 to lift in an inclined direction, that is, to lift in a direction parallel to the upper side surface of the conveyor belt 100.

[0041] In addition to the specific structure of the adjustment mechanism described above, other structures can also be used to perform the adjustment in two directions, such as two groups of linearly arranged motors or electric push rods vertically distributed.

[0042] In addition to detecting the deviation of the conveyor belt 100, the present device can also reset the deviated conveyor belt 100. When the belt conveyor stops due to the deviation of the conveyor belt 100, one side of the upper part of the conveyor belt 100 is still in the state of being deformed by the trigger platform 3. The worker holds down the top platform 4 and screws the trigger platform 3 downward until the bottom of the trigger platform 3 fits against the limit platform 5. At this time, the trigger platform 3 is screwed downward to the limit position. During the process of screwing the trigger platform 3 downward, the upper end of the conveyor belt 100 is gradually pushed, and the conveyor belt 100 is further deformed by pushing. The worker restarts the belt conveyor and observes the contact point between the trigger platform 3 and the conveyor belt 100 near the present device. When the conveyor belt 100 operates, the reaction force of the trigger platform 3 on the conveyor belt 100 causes the conveyor belt 100 to eliminate the deformation and move in the reverse direction, that is, to move in the reset direction, until the conveyor belt 100 returns to the normal operating position, thus realizing the correction of the deviation. During this process, the central controller does not shut down the belt conveyor. Then, the trigger platform 3 is tilted upward and screwed to the detection position. When the trigger platform 3 is in the detection position, the upper side surface of the conveyor belt 100 faces the cylindrical part of the trigger platform 3, and the circumferential surface of the cylindrical part of the trigger platform 3 is tangent to the extension surface of the upper side surface of the conveyor belt 100 when it is not deviated.

[0043] For the power supply of the present device, a battery 31 is provided inside the housing 1, and the battery 31 can supply power to the first motor 22 and the first electric push rod 8 inside the housing 1. A wire channel penetrating up and down is provided on the lifting platform 40, and wire holes are provided on both the lifting housing 32 and the housing 1. The cable connected to the battery 31 can pass through the wire holes and the wire channel to route and supply power to the second motor 33 and the third motor.

[0044] As Figure 3 shown, the top of the lifting shell 32 is open, and both lateral ends of the shell 1 have shielding frame parts. The shell 1 covers above the lifting shell 32. The shell 1 and the shielding frame parts on both sides can always cover above the lifting shell 32, preventing dust and other sundries from entering the inside, and ensuring the normal transmission of the internal structure of the lifting shell 32.

[0045] As Figure 2 and Figure 6 shown, the side of the shell 1 has an installation opening. At the four corners of the installation opening, there are two positioning holes 101 and two threaded holes 102 distributed crosswise. The shell 1 is detachably connected with a shell cover 111. The shell cover 111 has two positioning posts 1111 and two through holes 1112 distributed crosswise. The positioning posts 1111 are adapted to the positioning holes 101, and the positioning of the shell cover 111 during installation is realized by inserting the positioning posts 1111 into the positioning holes 101. Bolts threadedly connected with the threaded holes 102 are passed through the through holes 1112, and the shell cover 111 is firmly connected with the shell 1 by tightening the bolts. The detachable connection method also facilitates the maintenance of the internal structure.

[0046] This embodiment can detect the deviation of the conveyor belt 100 of the belt conveyor. During detection, the friction between the conveyor belt 100 and the trigger platform 3 can be increased to enhance the torque when the cam assembly rotates, facilitating the effective pushing of the contact of the travel switch 18 to act. The travel switch 18 sends a signal to the central controller, and the central controller controls the alarm to alarm and shuts down the belt conveyor. When the conveyor belt 100 does not deviate, the self-check mechanism conducts self-check on this device. When the alarm cannot be triggered to alarm, the relevant parts are repaired in time to ensure the effective deviation detection of the conveyor belt 100 by this device. In addition, the normal operation of the belt conveyor will not be affected during self-check.

[0047] Embodiment Two

[0048] As Figures 1-6As shown in the figure, a self-checking device for belt deviation of a belt conveyor proposed in this embodiment. Compared with the first embodiment, in this embodiment, a second torsion spring 42 located on the outer periphery of the screw 2 is connected between the top end of the housing 1 and the bottom end of the trigger platform 3. The second torsion spring 42 has a larger pitch and a larger range of torsion angles. Specifically, a clamping platform is provided at the top end of the housing 1, and an insertion platform is provided on the trigger platform 3. The insertion platform has a hole for one end of the second torsion spring 42 to be inserted, and the clamping platform has a channel for the other end of the second torsion spring 42 to be snapped into. Both ends of the second torsion spring 42 are limited, and when the trigger platform 3 rotates, the second torsion spring 42 can be twisted. When the conveyor belt 100 deviates, it drives the trigger platform 3 to rotate. The trigger platform 3 tilts downward and rotates in, and twists the second torsion spring 42. The contact between the trigger platform 3 and the conveyor belt 100 changes from line contact to surface contact. The conveyor belt 100 drives the screw 2 to rotate through the trigger platform 3, and finally pushes the contact of the travel switch 18 open through the second roller 17. During this process, the second torsion spring 42 is within the range of torsion angles. Subsequently, when the conveyor belt 100 automatically stops deviating under the action of the coal load, the upper part of the conveyor belt 100 will be separated from the contact with the trigger platform 3, and the second torsion spring 42 will drive the trigger platform 3 to rotate in the reverse direction, so that the trigger platform 3 can rotate obliquely upward, and the trigger platform 3 is reset to the detection position without manual reset, and the deviation detection of the conveyor belt 100 can continue.

[0049] After adding the second torsion spring 42, instead of manually resetting the deviated conveyor belt 100, it waits for the conveyor belt 100 to automatically change from the deviated state to the normal operation state under the action of the coal load.

[0050] Embodiment Three

[0051] As Figures 1-6 shown, a self-checking device for belt deviation of a belt conveyor proposed in this embodiment. Compared with the first embodiment, in this embodiment, the self-checking mechanism includes a mounting bracket 21, a second electric push rod 30 arranged in the housing 1 and driving the mounting bracket 21 to move linearly, a first motor 22 arranged on the mounting bracket 21, a fourth gear 23 connected to the output end of the first motor 22, a first rotating shaft 25 and a second rotating shaft 28 rotatably arranged on the mounting bracket 21, a fifth gear 24 arranged on the first rotating shaft 25 and meshing with the fourth gear 23, an incomplete gear 26 arranged on the first rotating shaft 25, a sixth gear 27 and a connecting ring 281 coaxially arranged on the second rotating shaft 28, and a first torsion spring 29 sleeved on the outer periphery of the second rotating shaft 28 and connected to the connecting ring 281 and the mounting bracket 21 at both ends.

[0052] The incomplete gear 26 has the same diameter as the second gear 10, and the third gear 13 and the sixth gear 27 have the same diameter. Then when the incomplete gear 26 drives the second gear 10 to rotate, the third gear 13 can drive the sixth gear 27 to rotate at the same speed without getting stuck.

[0053] The first motor 22 can drive the fourth gear 23 to rotate. The fourth gear 23 drives the fifth gear 24 to rotate. The fifth gear 24 drives the incomplete gear 26 to rotate through the first rotating shaft 25. The incomplete gear 26 first drives the second gear 10 to rotate. The second gear 10 drives the mounting shaft 9, the cam assembly, the third gear 13, the second rotating shaft 28, and the connecting ring 281 to rotate, and twists the first torsion spring 29. When the cam assembly rotates counterclockwise, it will push the first roller 16 to rotate. The first roller 16 drives the second roller 17 to rotate through the rotating frame 15. The rotating frame 15 rotates clockwise, and the second roller 17 pushes the contact of the travel switch 18 outwards. After the cam assembly disengages from the first roller 16, the contact of the travel switch 18 automatically resets. The incomplete gear 26 disengages from the second gear 10, and the first torsion spring 29 will drive the second rotating shaft 28 to reverse through the connecting ring 281. The cam assembly reverses (rotates clockwise). The cam assembly drives the limit plate 20 to rotate through the first roller 16, the rotating frame 15, and the second roller 17, and the tension spring 201 is stretched. After the cam assembly disengages from the first roller 16, the limit plate 20 and the tension spring 201 reset, and the second roller 17 resets between the limit plate 20 and the contact of the travel switch 18. If the alarm sounds during one rotation of the incomplete gear 26, the travel switch 18 and the alarm are fault-free. If the alarm does not sound, at least one of the travel switch 18 and the alarm has a fault, and the worker contacts the maintenance personnel for repair.

[0054] The self-checking method of the self-checking device for belt deviation of the above belt conveyor includes the following steps S1-S6 (wherein, steps S1-S4 are for automatic belt deviation detection of the conveyor belt 100, and steps S5 and S6 are for detection of the self-checking device):

[0055] S1. Install the adjusting mechanism on the frame 200 of the belt conveyor. For a belt conveyor with two rollers, install one such device on both axial sides of the two rollers respectively, that is, four such devices are used to detect the deviation of the conveyor belt 100 installed on the rollers;

[0056] S2. Before detecting whether the deviation distance of the conveyor belt 100 reaches the preset value, the adjusting mechanism first adjusts the trigger platform 3 to the initial positioning position. The circumferential surface of the cylindrical part of the trigger platform 3 is attached to the upper side surface of the conveyor belt 100 to position the position of the trigger platform 3. Then, the trigger platform 3 is adjusted to the detection position. The height of the trigger platform 3 increases. The upper side surface of the conveyor belt 100 faces the frustum part of the trigger platform 3. There is a gap between the upper side surface of the conveyor belt 100 and the frustum part along the inclined direction. This gap is the deviation preset value. Because the side surface of the frustum part of the trigger platform 3 is inclined downward, within the axial dimension range of the frustum part of the trigger platform 3, the larger the gap between the detection position and the initial positioning position, the greater the inclined upward movement distance of the trigger platform 3, and the greater the distance from the upper side surface of the conveyor belt 100 to the frustum part, the larger the deviation preset value; adjust the deviation preset value according to specific detection requirements;

[0057] S3. When the conveyor belt 100 runs off track, the conveyor belt 100 gradually moves towards the trigger platform 3 until it contacts the trigger platform 3. The conveyor belt 100 drives the trigger platform 3 to rotate. The trigger platform 3 screws downwards obliquely on the screw rod 2. The conical part of the trigger platform 3 moves downwards along the inclined direction and presses on the upper surface of the upper part of the conveyor belt 100, deforming the conveyor belt 100 at the contact point to increase the contact area. The conveyor belt 100 drives the screw rod 2 to rotate through the trigger platform 3. The screw rod 2 drives the first gear 6 to rotate. The first gear 6 drives the second gear 10 to rotate. The second gear 10 drives the cam assembly to rotate through the mounting shaft 9. The cam assembly drives the contact of the travel switch 18 to rotate through the first roller 16, the rotating frame 15 and the second roller 17. After the cam assembly rotates away from the first roller 16, the contact resets;

[0058] S4. The travel switch 18 sends a signal to the central controller. The central controller controls the alarm to give an alarm and shuts down the belt conveyor;

[0059] S5. When the conveyor belt 100 is in a non - off - track state, the self - inspection mechanism detects whether the travel switch 18 and the alarm are faulty. At this time, the trigger platform 3 does not contact the conveyor belt 100. During self - inspection, the second electric push rod 30 is used to drive the mounting frame 21 to move forward, so that the incomplete gear 26 meshes with the second gear 10, and the sixth gear 27 meshes with the third gear 13. The first motor 22 is started. The first motor 22 drives the incomplete gear 26 to rotate through the fourth gear 23, the fifth gear 24 and the first rotating shaft 25. The incomplete gear 26 drives the second gear 10 to rotate. The second gear 10 drives the cam assembly and the third gear 13 to rotate through the mounting shaft 9. The third gear 13 drives the first torsion spring 29 to twist through the sixth gear 27, the second rotating shaft 28 and the connecting ring 281. The cam assembly drives the contact of the travel switch 18 to rotate through the first roller 16, the rotating frame 15 and the second roller 17. After the cam assembly disengages from the first roller 16, the contact resets. After the incomplete gear 26 disengages from the second gear 10, the first torsion spring 29 drives the connecting ring 281 to reverse, and the cam assembly rotates in the reverse direction and resets. During the reverse rotation of the cam assembly, it pushes the first roller 16. The first roller 16 pushes the limit plate 20 away through the rotating frame 15 and the second roller 17, and the tension spring 201 is stretched. After the cam assembly disengages from the first roller 16, the limit plate 20 and the tension spring 201 reset, and the limit plate 20 contacts the contact of the travel switch 18 on both sides of the second roller 17;

[0060] S6. If the alarm gives an alarm, the travel switch 18 and the alarm are fault - free. If the alarm does not give an alarm, at least one of the travel switch 18 and the alarm has a fault, and the worker contacts the maintenance personnel to repair this device.

[0061] This embodiment can perform self-check during the operation of the belt conveyor to detect whether the travel switch 18 and the alarm are in normal operating conditions. If not, it can promptly arrange for personnel to repair so as to ensure that this device can effectively detect the deviation of the conveyor belt 100, and the self-check will not interfere with the normal operation of the belt conveyor.

[0062] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the gist of the present invention.

Claims

1. A conveyor belt deviation self-detection device in a belt conveyor, characterized in that: include: A deviation detection mechanism comprises a housing (1), a mounting shaft (9) rotatably arranged on the housing (1), a second gear (10) and a cam assembly coaxially arranged on the mounting shaft (9) from top to bottom, a connecting frame (14) and a switch frame (19) arranged on the housing (1), a rotating frame (15) rotatably arranged on the connecting frame (14) and having a first connecting arm and a second connecting arm, a first roller (16) rotatably arranged at the outer end of the first connecting arm, a second roller (17) rotatably arranged at the outer end of the second connecting arm, a travel switch (18) arranged on the switch frame (19) and having a contact in contact with the second roller (17), a limit plate (20) rotatably arranged on the housing (1) and located on one side of the second roller (17), a tension spring (201) having two ends connected to the limit plate (20) and the housing (1) respectively, a trigger assembly for triggering the rotation of the second gear (10) when the deviation distance of the conveyor belt (100) reaches a preset value, and an alarm arranged on the housing (1), wherein the length of the first connecting arm is greater than the length of the second connecting arm, and the first roller (16) is located on one side of the cam assembly; A self-checking mechanism, which is used to detect whether the travel switch (18) and the alarm are faulty; An adjusting mechanism, which is used to adjust the position of the deviation detection mechanism; The central controller is connected to the travel switch (18) for communication, and is control-connected to the alarm, the self-checking mechanism and the regulating mechanism.

2. The conveyor belt deviation self-detection device in the belt conveyor according to claim 1 is characterized in that: The trigger assembly comprises a screw (2) rotatably arranged on a housing (1), a trigger platform (3) threadedly connected to the screw (2), a top platform (4) arranged at the top end of the screw (2), a first gear (6) arranged at the bottom end of the screw (2), and a limit platform (5) arranged at the top of the housing (1) and below the trigger platform (3); the trigger platform (3) comprises a cylindrical portion and a truncated cone portion integrally formed from top to bottom, the top end diameter of the truncated cone portion is equal to the diameter of the cylindrical portion, and the bottom end diameter of the truncated cone portion is smaller than the top end diameter; the first gear (6) is meshingly connected with the second gear (10).

3. The conveyor belt deviation self-detection device in the belt conveyor according to claim 2 is characterized in that: A first electric push rod (8) is arranged in the housing (1); a movable end of the first electric push rod (8) is connected to an abutment platform (7), and the abutment platform (7) faces the screw rod (2).

4. The conveyor belt deviation self-detection device in the belt conveyor according to claim 2, characterized in that: A second torsion spring (42) located on the outer peripheral side of the screw rod (2) is connected between the top end of the housing (1) and the bottom end of the trigger platform (3).

5. The conveyor belt deviation self-detection device in a belt conveyor according to claim 2, characterized in that: The adjustment mechanism adjusts the trigger platform (3) to an initial positioning position and a detection position in sequence. When the trigger platform (3) is at the initial positioning position, the top end of the trigger platform (3) is in contact with the upper side surface of the conveyor belt (100). When the trigger platform (3) is at the detection position, the upper side surface of the conveyor belt (100) faces the truncated cone portion of the trigger platform (3).

6. The conveyor belt deviation self-detection device in the belt conveyor according to claim 5, characterized in that: The self-checking mechanism comprises a mounting frame (21), a second electric push rod (30) arranged in a housing (1) and driving the mounting frame (21) to move linearly, a first motor (22) arranged on the mounting frame (21), a fourth gear (23) connected to the output end of the first motor (22), a first rotating shaft (25) and a second rotating shaft (28) rotatably arranged on the mounting frame (21), a fifth gear (24) arranged on the first rotating shaft (25) and meshingly connected to the fourth gear (23), an incomplete gear (26) arranged on the first rotating shaft (25), a sixth gear (27) and a connecting ring (281) coaxially arranged on the second rotating shaft (28), and a first torsion spring (29) sleeved on the outer peripheral side of the second rotating shaft (28) and having two ends respectively connected to the connecting ring (281) and the mounting frame (21), the incomplete gear (26) and the second gear (10) have the same diameter, and the third gear (13) and the sixth gear (27) have the same diameter.

7. The conveyor belt deviation self-detection device in a belt conveyor according to claim 1, characterized in that: The shell (1) has a mounting opening on its side, and the four corners of the mounting opening respectively have two cross-distributed positioning holes (101) and two threaded holes (102). The shell (1) is detachably connected to a shell cover (111), and the shell cover (111) has two cross-distributed positioning columns (1111) and two through holes (1112). The positioning columns (1111) are adapted to the positioning holes (101), and bolts threadedly connected to the threaded holes (102) are passed through the through holes (1112).

8. A method for self-checking the deviation of a conveyor belt in a belt conveyor, implemented by the self-checking device for self-checking the deviation of a conveyor belt in a belt conveyor according to claim 6, characterized in that: The method comprises the following steps: S1, installing the adjustment mechanism on the frame (200) of the belt conveyor; S2, before detecting whether the deviation distance of the conveyor belt (100) reaches a preset value, the adjustment mechanism first adjusts the trigger platform (3) to an initial positioning position, so that the circumferential surface of the cylindrical portion of the trigger platform (3) is in contact with the upper side surface of the conveyor belt (100), and then adjusts the trigger platform (3) to a detection position, so that the upper side surface of the conveyor belt (100) faces the truncated cone portion of the trigger platform (3); S3, when the conveyor belt (100) deviates, the conveyor belt (100) gradually deviates toward the trigger platform (3) until it contacts the trigger platform (3), the conveyor belt (100) drives the trigger platform (3) to rotate, the trigger platform (3) rotates downwardly on the screw rod (2), the truncated cone portion of the trigger platform (3) moves downward along the inclined direction and presses on the upper surface of the upper part of the conveyor belt (100), causing the conveyor belt (100) to deform at the contact point to increase the contact area, the conveyor belt (100) drives the screw rod (2) to rotate through the trigger platform (3), the screw rod (2) drives the first gear (6) to rotate, the first gear (6) drives the second gear (10) to rotate, the second gear (10) drives the cam assembly to rotate through the mounting shaft (9), the cam assembly pushes the contact of the travel switch (18) to rotate through the first roller (16), the rotating frame (15) and the second roller (17), and the contact is reset after the cam assembly is turned away from the first roller (16); S4, the travel switch (18) sends a signal to the central controller, and the central controller controls the alarm to sound an alarm; S5. When the conveyor belt (100) is in a non-deviation state, the travel switch (18) and the alarm are detected by the self-checking mechanism to see if they are faulty. During the self-checking, the second electric push rod (30) drives the mounting frame (21) to move forward, so that the incomplete gear (26) is meshed with the second gear (10), the sixth gear (27) is meshed with the third gear (13), and the first motor (22) is started. The first motor (22) drives the incomplete gear (26) to rotate through the fourth gear (23), the fifth gear (24) and the first rotating shaft (25). The incomplete gear (26) drives the second gear (10) to rotate, and the second gear (13) is engaged. 10) driving the cam assembly and the third gear (13) to rotate through the mounting shaft (9), the third gear (13) driving the first torsion spring (29) to twist through the sixth gear (27), the second rotating shaft (28) and the connecting ring (281), the cam assembly pushing the contact of the travel switch (18) to rotate through the first roller (16), the rotating frame (15) and the second roller (17), after the cam assembly is separated from the first roller (16), the contact is reset, after the incomplete gear (26) is disengaged from the second gear (10), the first torsion spring (29) drives the connecting ring (281) to reverse, and the cam assembly rotates in the opposite direction and resets; S6. If the alarm sounds, the travel switch (18) and the alarm are not at fault; if the alarm does not sound, at least one of the travel switch (18) and the alarm is at fault.

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