A belt conveyor self-checking speed sensor

Abstract

This invention relates to the field of speed sensors, specifically a self-testing speed sensor for belt conveyors. It includes a mounting assembly, a rolling assembly, a detection assembly, and a self-testing mechanism. The mounting assembly includes a mounting frame, a connecting frame, and a mounting base. The rolling assembly includes a mounting shaft rotatably mounted on the mounting frame and a roller coaxially mounted on the mounting shaft. The detection assembly detects the roller's rotational speed. The self-testing mechanism includes a disengagement assembly and a servo geared motor. During self-testing of the detection assembly, the roller is disengaged from the conveyor belt by the disengagement assembly, the servo geared motor is activated, and the detection assembly detects the roller's rotational speed. By comparing the detected rotational speed with the known output speed of the servo geared motor, the normal operation of the detection assembly is determined. This invention can detect the conveyor belt speed through the detection assembly. When the conveyor belt speed is below standard or stops, personnel can be promptly dispatched to the site for maintenance to ensure normal coal conveying. Furthermore, it can also perform self-testing of the detection assembly.

Description

Technical Field

[0001] This invention relates to the field of speed sensors, and in particular to a self-testing speed sensor for belt conveyors. Background Technology

[0002] Belt conveyors transport coal. The conveyor belt is fitted onto rotating rollers, which are driven by a motor. The upper part of the conveyor belt is V-shaped, allowing the coal to be transported on the inside and preventing it from easily falling off the sides. For current belt conveyors, after startup, the rotational speed of the rotating rollers is determined by the rotational speed of the motor, thus inferring the conveyor belt speed and the material conveying speed.

[0003] However, abnormal situations may occur during the operation of belt conveyors. For example, when slippage occurs between the conveyor belt and the rollers, the rollers may rotate normally, but the conveyor belt may not move synchronously. Workers may only know that the motor and rollers are rotating normally, but they may not be aware that the conveyor belt is not operating properly, leading to substandard material conveying speed or even complete conveyor cessation. Workers cannot promptly detect this abnormal situation. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a self-testing speed sensor for belt conveyors. This sensor can detect the speed of the conveyor belt through a detection component. When the conveyor belt speed is below standard or stops, personnel can be promptly dispatched to the site for maintenance to ensure the normal transport of coal. In addition, it can also perform self-testing on the detection component. The speed detection and the self-testing of the detection component are highly efficient and accurate.

[0005] The technical solution of this invention is a self-testing speed sensor for a belt conveyor, comprising a mounting assembly, a rolling assembly, a detection assembly, and a self-testing mechanism. The mounting assembly includes a mounting frame, a connecting frame with one end mounted on the mounting frame, and a mounting base for rotatably mounting the other end of the connecting frame; the mounting base is fixedly mounted on the frame of the belt conveyor. The rolling assembly includes a mounting shaft rotatably mounted on the mounting frame and a roller coaxially mounted on the mounting shaft; the roller rolls on the inner bottom surface of the conveyor belt as the conveyor belt moves. The detection assembly is used to detect the rotational speed of the roller. The self-testing mechanism includes components for supporting the roller so that the roller is in contact with the belt. The conveyor belt detachment component and the servo geared motor mounted on the mounting frame and driving the mounting shaft rotate in the conveyor belt detachment mechanism are used. When the detection component is not performing a self-test, the roller is not detached from the conveyor belt and moves with the conveyor belt. The conveyor belt speed is determined based on the roller speed detected by the detection component. When the detection component performs a self-test, the roller is detached from the conveyor belt by the detachment component, the servo geared motor is started to drive the mounting shaft, and the mounting shaft drives the roller to rotate. The detection component detects the roller speed and determines whether the detection component is operating normally by comparing the detected speed with the known output speed of the servo geared motor.

[0006] Preferably, the detection component includes multiple magnets evenly distributed around the central axis of the drum on one side of the drum's axial end face, and a Hall sensor mounted on the mounting bracket. When the magnets rotate, they pass the detection position of the Hall sensor. When the drum rotates, it drives the multiple magnets to rotate. When the magnets pass the detection position of the Hall sensor, the Hall sensor is triggered to detect them. The central control system receives the detection signal and determines the drum's rotational speed, i.e., angular velocity, based on the angular distribution of the multiple magnets and the number of pulses detected by the Hall sensor.

[0007] Preferably, the disengagement assembly includes a rotating frame rotatably mounted on a mounting shaft, a support roller rotatably mounted at the outer end of the rotating frame rotatably, and a telescopic mechanism that is hinged at both ends to the rotating frame rotatably and the mounting frame, respectively.

[0008] Preferably, the disengagement assembly includes a rotating sleeve rotatably mounted on the mounting shaft, a rotating shaft rotatably mounted on the mounting frame and the rotating sleeve and connected to the mounting shaft for transmission, a set of guide assemblies on the rotating sleeve and the mounting frame, a movable frame mounted on the guide assemblies, an inclined plate inclinedly mounted on the top of the movable frame, a second support roller rotatably mounted on the bottom of the movable frame, and a pushing assembly mounted on the rotating shaft and pushing the inclined plate, wherein the rotational speed of the rotating shaft is greater than the rotational speed of the mounting shaft.

[0009] Preferably, the pushing component includes a rotating frame two disposed on the rotating shaft and multiple sets of triggering components evenly distributed around the rotating frame two. The outer periphery of the rotating frame two has multiple L-shaped grooves corresponding one-to-one with the triggering components. The L-shaped grooves have a receiving surface that is staggered with the rotating shaft and a limiting surface facing the central axis of the rotating shaft.

[0010] Preferably, the triggering assembly includes a bracket mounted on the rotating frame two, a connecting shaft rotatably mounted on the bracket, and a push plate mounted on the connecting shaft. A torsion spring is sleeved on the connecting shaft, with its two ends connected to the push plate and the bracket respectively. When the rotating frame two drives the push plate to rotate, centrifugal force causes the push plate to rotate outwards to the limiting surface side, causing the torsion spring to twist. When the detection assembly is not performing a self-test, the torsion spring releases its torque, causing the push plate to reverse to the storage surface side.

[0011] Preferably, both the push plate and the bracket have slots for inserting the end of the torsion spring.

[0012] Preferably, the outer end of the push plate is bent or tilted towards the rotation direction of the rotating frame 2. When the push plate rotates with the rotating frame 2, in addition to using centrifugal force to rotate outward, the air resistance during rotation can also be used to make the push plate rotate into position as quickly as possible.

[0013] Compared with existing technologies, this invention has the following beneficial technical effects: This invention can serve as a speed sensor for detecting the speed of the conveyor belt in a belt conveyor. When the conveyor belt speed is below standard or stops, personnel can be promptly dispatched to the site for repair, ensuring the normal transport of coal. Furthermore, this invention can also perform self-testing on the detection component. If the self-test results indicate a fault or inaccurate accuracy of the detection component, personnel can be promptly dispatched for repair. Remote speed detection and self-testing of the detection component are highly efficient and accurate. During self-testing, the support roller is supported on the inner bottom surface of the conveyor belt, the roller is lifted, and the mounting shaft is driven by a servo geared motor to rotate the roller. The detection component detects the roller speed, and the detected speed is compared with the output speed of the servo geared motor. Whether the difference exceeds a predetermined threshold range determines whether the detection component is operating normally. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram from the rear view of Embodiment 1 of the present invention; Figure 2 This is a structural schematic diagram from the front view of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure from the front view of Embodiment 2 of the present invention; Figure 4 This is a partial structural cross-sectional view of Embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the pushing component in Embodiment 2 of the present invention; Figure 6 This is a partial structural diagram of the rotation range of the push plate in Embodiment 2 of the present invention.

[0015] Reference numerals in the attached drawings: 1. Mounting bracket; 2. Connecting bracket; 3. Mounting base; 4. Servo geared motor; 5. Mounting shaft; 6. Roller; 7. Magnet; 8. Hall sensor; 9. Rotating frame one; 10. Support roller one; 11. Telescopic mechanism; 12. Gear one; 13. Gear two; 14. Mounting cover; 15. Rotating sleeve; 16. Moving frame; 17. Connecting platform; 18. Sliding sleeve; 19. Guide rod; 20. Base platform; 21. Support roller two; 22. Inclined plate; 23. Rotating shaft; 24. Bracket; 25. Torsion spring; 26. Rotating frame two; 261. Storage surface; 262. Limiting surface; 27. Push plate; 28. Connecting shaft. Detailed Implementation

[0016] Example 1: As Figure 1 and Figure 2 As shown in the figure, this embodiment proposes a self-testing speed sensor for belt conveyors, which includes an installation component, a rolling component, a detection component, and a self-testing mechanism.

[0017] The mounting components include a mounting frame 1, a connecting frame 2 with one end mounted on the mounting frame 1, and a mounting base 3 for the other end of the connecting frame 2 to be rotatably mounted. The mounting base 3 is fixedly mounted on the frame of the belt conveyor, and the connecting frame 2 gradually tilts from top to bottom in the direction of movement of the lower part of the conveyor belt.

[0018] The rolling assembly includes a mounting shaft 5 rotatably mounted on a mounting frame 1 and a roller 6 coaxially mounted on the mounting shaft 5. The roller 6 presses against the inner bottom surface of the conveyor belt due to its own weight, facilitating subsequent detection of the conveyor belt's speed and also providing some downward pressure to improve belt tension. The roller 6 rolls along with the conveyor belt on its inner bottom surface. The outer circumference of the roller 6 is designed with anti-slip textures to increase friction with the conveyor belt, ensuring that the conveyor belt effectively drives the roller 6 to rotate during conveyor belt speed detection.

[0019] like Figure 1 and Figure 2 As shown, the detection component is used to detect the rotational speed of roller 6 and convert the speed of the conveyor belt into the speed of roller 6. During the conversion, the relationship between the radius, angular velocity and linear velocity of roller 6 is used, i.e., v=ω*r, where v is the linear velocity, ω is the angular velocity and r is the radius of roller 6. The linear velocity of roller 6 is indirectly determined by detecting the angular velocity of roller 6, and the linear velocity of roller 6 is equal to the speed of the conveyor belt.

[0020] The detection assembly includes multiple magnets 7 evenly distributed around the central axis of the drum 6 on one axial end face, and a Hall sensor 8 mounted on the mounting bracket 1. As the magnets 7 rotate, they pass the detection position of the Hall sensor 8. The rotation of the drum 6 drives the multiple magnets 7 to rotate. When a magnet 7 passes the detection position of the Hall sensor 8, it triggers the Hall sensor 8 to detect it. The central control system receives the detection signal and determines the rotational speed, i.e., angular velocity, of the drum 6 based on the angular distribution of the multiple magnets 7 and the number of pulses detected by the Hall sensor 8.

[0021] The self-testing mechanism includes a disengagement component for supporting the roller 6 to disengage it from the conveyor belt of the belt conveyor, and a servo geared motor 4 mounted on the mounting frame 1 and driving the mounting shaft 5 to rotate. When the detection component is not performing a self-test, the roller 6 is not disengaged from the conveyor belt and moves with the conveyor belt. The speed of the conveyor belt is determined based on the rotational speed of the roller 6 detected by the detection component. The rotational speed of the roller 6 is an angular velocity, which is converted into linear velocity to obtain the speed of the conveyor belt. When the detection component is performing a self-test, the disengagement component disengages the roller 6 from the conveyor belt to prevent the conveyor belt from affecting the self-testing process. The servo geared motor 4 is started to drive the mounting shaft 5 to rotate, and the mounting shaft 5 drives the roller 6 to rotate. The rotational speed of the roller 6 during self-testing is greater than that of the roller 6 without self-testing. The detection component detects the rotational speed of the roller 6, which is an angular velocity. By comparing the detected angular velocity with the known output speed of the servo geared motor 4, it is determined whether the detection component is operating normally. If the difference between the two speeds exceeds a predetermined threshold range, it indicates that the accuracy of the detection component has decreased or that it is malfunctioning, and personnel need to be arranged for maintenance. The detection components and servo geared motor 4 are controlled by the same central control system for signal and data processing. The relevant signals are transmitted remotely through the communication module, allowing staff to remotely obtain the operating speed of the belt conveyor and perform self-testing of the detection components.

[0022] like Figure 2 As shown, the disengagement assembly includes a rotating frame 9 rotatably mounted on the mounting shaft 5, a support roller 10 rotatably mounted on the outer end of the rotating frame 9, and a telescopic mechanism 11 hinged at both ends to the rotating frame 9 and the mounting frame 1, respectively. The telescopic mechanism 11 can be an electric push rod or a hydraulic cylinder, and its extension and retraction are controlled by a central control system. When the detection assembly is self-tested, the telescopic mechanism 11 extends, the rotating frame 9 rotates downward, and the support roller 10 is supported on the inner bottom surface of the conveyor belt. The rotating frame 9 supports the mounting shaft 5, thereby lifting the roller 6 and causing it to disengage from the inner bottom surface of the conveyor belt. When the detection assembly is not self-tested, the telescopic mechanism 11 retracts, and the support roller 10 is higher than the inner bottom surface of the conveyor belt and does not move with the conveyor belt, or it may contact the inner bottom surface of the conveyor belt. Neither of these conditions will affect the conveyor belt's ability to rotate the roller 6 using friction.

[0023] This embodiment serves as both a speed sensor for detecting the speed of the conveyor belt in a belt conveyor, allowing for timely on-site maintenance when the conveyor belt speed is below standard or stops, ensuring normal coal transport; and a self-testing function for the detection component, enabling timely repair when the self-test results indicate a fault or inaccuracy. The speed detection and self-testing of the detection component are highly efficient and accurate. When detecting speed, the detection component can be used to detect the rotational speed of the roller 6, thereby indirectly determining the speed of the conveyor belt that rolls with the roller 6. Furthermore, a self-testing mechanism can be used to self-test the detection component to check if it is operating normally. Before self-testing, the support roller 10 is supported on the inner bottom surface of the conveyor belt by the telescopic mechanism 11, the roller 6 is lifted, and the mounting shaft 5 is driven to rotate by the servo reduction motor 4. The detection component detects the rotational speed of the roller 6, and the detected speed is compared with the output speed of the servo reduction motor 4. The difference between the two values ​​is used to determine whether the detection component is operating normally. The speed detection of the conveyor belt and the self-inspection process of the detection components can both be carried out remotely using Internet of Things (IoT) technology, eliminating the need for personnel to go to the site for inspection and resulting in high inspection efficiency.

[0024] Example 2: This example proposes a self-testing speed sensor for a belt conveyor. The difference between this example and Example 1 is as follows: Figures 3-6 As shown, a disengagement assembly with another structural form is used. The disengagement assembly includes a rotating sleeve 15 rotatably mounted on the mounting shaft 5; a rotating shaft 23 rotatably mounted on the mounting frame 1 and the rotating sleeve 15 and driven by the mounting shaft 5; a set of guide assemblies on both the rotating sleeve 15 and the mounting frame 1; a movable frame 16 mounted on the guide assemblies; an inclined plate 22 tilted at the top of the movable frame 16; a second support roller 21 rotatably mounted at the bottom of the movable frame 16; and a pushing assembly mounted on the rotating shaft 23 that pushes against the inclined plate 22. The mounting shaft 5 drives the rotating shaft 23 to rotate at a higher speed via a transmission assembly. The transmission assembly includes a first gear 12 mounted on the mounting shaft 5 and a second gear 13 mounted on the rotating shaft 23. The first gear 12 and the second gear 13 are meshed, with the first gear 12 being larger than the second gear 13. The rotational speed of the rotating shaft 23 is greater than that of the mounting shaft 5. A mounting cover 14 can be added to the mounting frame 1 to protect the first gear 12 and the second gear 13.

[0025] During the self-inspection of the detection component, the servo geared motor 4 operates, and the second support roller 21 is supported on the inner bottom surface of the conveyor belt, while the roller 6 does not contact the conveyor belt. Specifically, the servo geared motor 4 drives the mounting shaft 5 to rotate, and the rotating shaft 23 drives the pushing component to rotate. The pushing component pushes the inclined plate 22 from its lower end to its higher end. Because the second support roller 21 is supported on the inner bottom surface of the conveyor belt, the pushing component moves upward due to the reaction force. Guided by the guide component, the pushing component drives the mounting shaft 5 to move upward through the rotating shaft 23, the rotating sleeve 15, and the mounting frame 1. Specifically, it moves upward around the rotation center axis at the top of the connecting frame 2, thereby lifting the roller 6 and causing it to detach from the conveyor belt. When the self-inspection of the detection component is not performed, both the roller 6 and the second support roller 21 roll on the inner bottom surface of the conveyor belt.

[0026] like Figure 4 As shown, the guide assembly includes a connecting platform 17 disposed on the upper part of the movable frame 16, a sliding sleeve 18 disposed on the connecting platform 17, a guide rod 19 for sliding installation of the sliding sleeve 18, and a base platform 20 disposed at the bottom end of the guide rod 19. The base platform 20 can prevent the guide rod 19 from falling off the sliding sleeve 18. The guide rods 19 in the two sets of guide assemblies are respectively disposed on the rotating sleeve 15 and the mounting frame 1, and the support roller 21 rests on the inner bottom surface of the conveyor belt due to its own weight.

[0027] The pushing assembly includes a rotating frame 26 mounted on the rotating shaft 23 and multiple sets of triggering components evenly distributed around the rotating frame 26. The rotating frame 26 has multiple L-shaped grooves on its outer periphery, each corresponding to one of the triggering components. Each L-shaped groove has a receiving surface 261 offset from the rotating shaft 23 and a limiting surface 262 facing the central axis of the rotating shaft 23. The receiving surface 261 is the plane containing the long side of the L-shape of the L-shaped groove, and the limiting surface 262 is the plane containing the short side of the L-shape of the L-shaped groove; that is, the receiving surface 261 is wider than the limiting surface 262. The rotating frame 26 is a laterally distributed cylindrical structure. As the rotating frame 26 rotates with the rotating shaft 23, the triggering components gradually rotate from the receiving surface 261 side to the limiting surface 262 side. The distance from the outer end of the triggering component to the central axis of the rotating shaft 23 gradually increases, and after reaching the desired distance, it pushes against the inclined plate 22.

[0028] like Figure 5 and Figure 6As shown, the triggering assembly includes a bracket 24 mounted on the rotating frame 26, a connecting shaft 28 rotatably mounted on the bracket 24, and a push plate 27 mounted on the connecting shaft 28. A torsion spring 25 is sleeved on the connecting shaft 28, with its two ends connected to the push plate 27 and the bracket 24 respectively. Both the push plate 27 and the bracket 24 have slots for the ends of the torsion spring 25 to be inserted, preventing the torsion spring 25 from easily falling off. When the rotating frame 26 drives the push plate 27 to rotate, centrifugal force causes the push plate 27 to rotate outward to the side of the limiting surface 262, causing the push plate 27 to twist the torsion spring 25. When the push plate 27 pushes against the inclined plate 22, it moves upward due to the reaction force, thereby supporting the roller 6 through the rotating shaft 23, rotating sleeve 15, mounting frame 1, and mounting shaft 5. This causes the roller 6 to move upward around the rotation center axis of the top of the connecting frame 2 and detach from the conveyor belt. At this time, the distance from the bottom end of the support roller 21 to the center axis of the mounting shaft 5 is greater than the distance from the bottom end of the roller 6 to the center axis of the mounting shaft 5. During the intervals between the push plates 27 sequentially pushing the inclined plate 22, if the push plate 27 does not push the inclined plate 22, the roller 6 will slightly move downward due to its own weight. However, before it moves down to contact the inner bottom surface of the conveyor belt, the next rotating push plate 27 will push the inclined plate 22 again, lifting the roller 6 upward again. This ensures that during the self-inspection process of the detection component, the roller 6 is only supported on the conveyor belt by the second support roller 21 and is detached from the conveyor belt. The moving conveyor belt will not affect the roller 6 driven by the servo reduction motor 4, and will not affect the self-inspection results of the detection component.

[0029] When the self-test of the detection component is stopped, the servo reduction motor 4 is turned off, the torsion spring 25 releases torque, and drives the push plate 27 to reverse to the side of the storage surface 261. The outer end of the push plate 27 contacts the storage surface 261, making the structure more regular.

[0030] When the detection component is not self-tested, the conveyor belt drives the roller 6 to rotate. The speed of the conveyor belt is detected by the detection component. The roller 6 drives the rotating frame 26 to rotate through the mounting shaft 5, the transmission component and the rotating shaft 23. However, the rotation speed of the rotating frame 26 is not high enough to make the push plate 27 rotate outward due to centrifugal force to contact the inclined plate 22.

[0031] like Figure 5 As shown, the outer end of the push plate 27 is bent or tilted in the direction of rotation of the rotating frame 26, which can catch the wind. When the push plate 27 rotates with the rotating frame 26, in addition to using centrifugal force to rotate outward, it can also use the air resistance during rotation to make the push plate 27 rotate into position as soon as possible.

[0032] In this embodiment, only a servo geared motor 4 is used as the actuator during the self-test of the detection component. The servo geared motor 4 drives the mounting shaft 5 and the roller 6 to rotate. The rotation speed of the roller 6 during the self-test is greater than the rotation speed driven by the conveyor belt when testing the conveyor belt speed. The rotation speed of the rotating frame 26 during the self-test is also greater, to the point that the push plate 27 rotates outward due to centrifugal force to push the inclined plate 22. The reaction force is used to detach the roller 6 from the conveyor belt, ensuring the accuracy of the self-test results of the detection component. During the self-test, the push plate 27 intermittently pushes the inclined plate 22, and the force applied to the conveyor belt by the support roller 21 is dynamically changing, which can shake off coal and coal dust that may be attached to the lower surface of the conveyor belt. The roller 6 also vibrates back and forth, which can use centrifugal force and vibration to clean the coal attached to its own surface. When the conveyor belt speed is tested normally by the detection component in the future, the roller 6 can roll stably on the inner bottom surface of the conveyor belt, and the roller 6 can more accurately reflect the movement speed of the conveyor belt indirectly. If the coal adheres to the surface of roller 6, the surface of roller 6 will be irregular, and the areas with coal will protrude outwards. The conveyor belt will come into contact with the protruding coal and will not be able to fully fit and transmit power with roller 6. As a result, the speed of roller 6 detected by the detection component cannot accurately reflect the actual speed of the conveyor belt.

[0033] The embodiments of the present invention have been described in detail above with reference to 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 spirit of the present invention.

Claims

1. A self-testing speed sensor for a belt conveyor, characterized in that, include: The mounting components include a mounting bracket (1), a connecting bracket (2) with one end mounted on the mounting bracket (1), and a mounting seat (3) for rotatably mounting the other end of the connecting bracket (2). The rolling assembly includes a mounting shaft (5) rotatably mounted on a mounting frame (1) and a roller (6) coaxially mounted on the mounting shaft (5), the roller (6) rolling on the inner bottom surface of the conveyor belt of the belt conveyor as the conveyor belt moves; The detection component detects the rotational speed of the drum (6); The self-testing mechanism includes a disengagement component for supporting the roller (6) to disengage the roller (6) from the conveyor belt of the belt conveyor, and a servo geared motor (4) mounted on the mounting frame (1) and driving the mounting shaft (5) to rotate. When the self-testing of the detection component is not performed, the roller (6) is not disengaged from the conveyor belt and moves with the conveyor belt. The speed of the conveyor belt is determined based on the rotational speed of the roller (6) detected by the detection component. When the self-testing of the detection component is performed, the roller (6) is disengaged from the conveyor belt by the disengagement component, the servo geared motor (4) is started, the detection component detects the rotational speed of the roller (6), and the detection component judges whether the detection component is operating normally by comparing the detected rotational speed with the known output speed of the servo geared motor (4).

2. The self-testing speed sensor for a belt conveyor according to claim 1, characterized in that, The detection assembly includes multiple magnets (7) evenly distributed around the central axis of the roller (6) on one side of the axial side end face, and a Hall sensor (8) set on the mounting bracket (1). When the magnet (7) rotates, it passes the detection position of the Hall sensor (8).

3. The self-testing speed sensor for a belt conveyor according to claim 1, characterized in that, The disengagement assembly includes a rotating frame (9) rotatably mounted on the mounting shaft (5), a support roller (10) rotatably mounted on the outer end of the rotating frame (9), and a telescopic mechanism (11) with its two ends hinged to the rotating frame (9) and the mounting frame (1), respectively.

4. The self-testing speed sensor for a belt conveyor according to claim 1, characterized in that, The disengagement assembly includes a rotating sleeve (15) mounted on the mounting shaft (5), a rotating shaft (23) mounted on the mounting frame (1) and the rotating sleeve (15) and connected to the mounting shaft (5) for transmission, a set of guide components mounted on the rotating sleeve (15) and the mounting frame (1), a movable frame (16) mounted on the guide components, an inclined plate (22) mounted on the top of the movable frame (16), a second support roller (21) mounted on the bottom of the movable frame (16), and a pushing assembly mounted on the rotating shaft (23) and pushing the inclined plate (22). The rotational speed of the rotating shaft (23) is greater than the rotational speed of the mounting shaft (5).

5. A self-testing speed sensor for a belt conveyor according to claim 4, characterized in that, The pushing component includes a rotating frame two (26) set on the rotating shaft (23) and multiple sets of triggering components evenly distributed around the rotating frame two (26). The outer periphery of the rotating frame two (26) has multiple L-shaped grooves corresponding to the triggering components. The L-shaped grooves have a receiving surface (261) that is offset from the rotating shaft (23) and a limiting surface (262) facing the central axis of the rotating shaft (23).

6. A self-testing speed sensor for a belt conveyor according to claim 5, characterized in that, The triggering component includes a bracket (24) mounted on the rotating frame (26), a connecting shaft (28) rotatably mounted on the bracket (24), and a push plate (27) mounted on the connecting shaft (28). A torsion spring (25) is sleeved on the connecting shaft (28) and its two ends are respectively connected to the push plate (27) and the bracket (24).

7. A self-testing speed sensor for a belt conveyor according to claim 6, characterized in that, Both the push plate (27) and the bracket (24) have slots for inserting the end of the torsion spring (25).

8. A self-testing speed sensor for a belt conveyor according to claim 6, characterized in that, The outer end of the push plate (27) bends or tilts to the side of the rotation direction of the rotating frame (26).

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