Belt tearing detection device for belt conveyor

Abstract

The invention discloses a belt tearing detection device for a belt conveyor, and relates to the technical field of belt tearing detection. The detection protection mechanism comprises a detection switch mechanism and an electric lifting mechanism; the detection switch mechanism is arranged at the bottom of the conveying face of the conveying belt body in parallel and used for detecting whether longitudinal tearing exists in the conveying belt body or not. And when the detection switch mechanism detects that the conveying belt body is torn, the electric lifting mechanism is started to lift and support the tearing position of the conveying belt body. When the conveying belt body is longitudinally punctured and torn by an object, the object is exposed from the bottom of the conveying belt body and can act on the arranged detection switch mechanism along with the operation of the conveying belt body, then the electric lifting and lifting mechanism is started by the detection switch mechanism, and the torn position is lifted and supported by the electric lifting and lifting mechanism; therefore, the situation that the tearing position is continuously enlarged and cannot be repaired due to material weight is avoided.

Description

Technical Field

[0001] This invention relates to the field of belt tear detection technology, and in particular to a belt tear detection device for belt conveyors. Background Technology

[0002] Belt conveyors use a closed, ring-shaped belt as the load-bearing and traction component. Driven by a drive drum, they transport materials from the starting point to the ending point. However, during high-load, long-cycle operation, the belt itself may experience tearing, especially longitudinal tearing. The main cause is that when materials fall from a height onto the belt, sharp foreign objects mixed in may pierce the belt like spears, or some compression may cause large hard objects to cut through the belt, resulting in longitudinal tearing and affecting normal operation.

[0003] Existing belt conveyor tear detection devices primarily install tear detection switch assemblies between the upper and lower belts in the carrying section for longitudinal tear detection. A common type of tear detection switch assembly is the pull-cord switch array. Its principle is as follows: a row of independent swing baffles or pull cords is installed in the area where material leakage is possible. When a longitudinal tear occurs in the belt, material leaks or passes through the tear. The leaked or passed material impacts one of the baffles or pull cords, triggering the mechanical switch and issuing an alarm, thus achieving tear detection feedback.

[0004] However, while existing belt conveyor tear detection switches can detect longitudinal tears in the belt and promptly stop the machine and issue an alarm when a tear is detected, there is a significant risk of damage. If the tear is caused by a rigid foreign object (such as a steel bar, crowbar, or large, sharp ore) embedded longitudinally in the belt, it can become lodged between the upper and lower belts. After the machine stops, the weight of the material above the object and the object's own weight will continue to exert downward tearing forces on both sides of the tear, potentially causing it to slowly extend and further enlarge. Ultimately, this can lead to the belt becoming unrepairable and requiring complete replacement, resulting in substantial losses. Summary of the Invention

[0005] The purpose of this invention is to provide a belt tear detection device for belt conveyors, so as to solve the technical problem that the belt tear detection device of the belt conveyor in the prior art cannot stop and protect when a tear is detected, which easily leads to the further expansion of the tear.

[0006] The technical problem to be solved by this invention can be achieved through the following technical solution: A belt tear detection device for a belt conveyor includes a detection and protection mechanism; the detection and protection mechanism includes a detection switch mechanism and an electric lifting and supporting mechanism. The detection switch mechanism is arranged parallel to the bottom of the conveyor surface of the conveyor belt. The detection switch mechanism is used to detect whether there is a longitudinal tear in the conveyor belt. When the detection switch mechanism detects a tear in the conveyor belt, it activates the electric lifting and supporting mechanism to raise and support the area below the tear in the conveyor belt.

[0007] Preferably, the detection switch mechanism includes a fixed crossbeam, which is parallel to the bottom of the conveying surface of the conveyor belt; a limit switch is provided on the fixed crossbeam, and alarms electrically connected to the limit switches are fixedly installed at both ends of the fixed crossbeam.

[0008] Preferably, the limit switch includes a mounting side plate, a flip switch plate, and a pressure sensor switch; the mounting side plate is vertically fixed to the side of the fixed crossbeam; the mounting side plate has a mounting cavity near the fixed crossbeam, the side of the mounting cavity away from the fixed crossbeam is open, and the bottom edge of the opening of the mounting cavity is movably connected to the flip switch plate via a spring-loaded hinge; the pressure sensor switch is installed on the side of the flip switch plate near the interior of the mounting cavity, and the pressure sensor switch is used to control the start of the electric lifting mechanism; the pressure sensor switch is also electrically connected to an alarm.

[0009] Preferably, the mounting cavity has an opening on the side near the fixed crossbeam, and multiple elastic cloth blocks are distributed laterally within the opening.

[0010] Preferably, the electric lifting and supporting mechanism includes an electric telescopic rod, a lifting frame, and a lifting plate. The telescopic end of the electric telescopic rod is fixedly connected to the lifting frame. The lifting plate is horizontally positioned below the limit switch and is fixedly connected to the lifting frame. The electric telescopic rod is also electrically connected to a pressure sensing switch.

[0011] Preferably, the limit switch, lifting frame and lifting plate are each provided in two sets, and are symmetrically distributed on both sides of the fixed crossbeam.

[0012] Preferably, a pressure sensing switch two is installed on the surface of the lifting plate, and the pressure sensing switch two, pressure sensing switch one, and electric telescopic rod are connected in series. The pressure sensing switch two is a normally closed switch, and the pressure sensing switch one is a normally open switch.

[0013] Preferably, a connecting frame is provided on the side of the limit switch near the lifting plate; a protective cover is movably connected to the side of the connecting frame away from the limit switch via a spring-loaded hinge, and the protective cover is tilted and rests on the lifting plate.

[0014] Preferably, the lifting frame has multiple inverted toothed grooves spaced longitudinally at equal intervals on the side near the protective cover, and the inverted toothed grooves are configured to cooperate with the protective cover.

[0015] Preferably, an inverted V-shaped guide frame that mates with the protective cover plate is fixedly connected to the connecting frame.

[0016] The beneficial effects of this invention are: 1. When the conveyor belt of the present invention is torn longitudinally by an object, the object is exposed from the bottom of the conveyor belt and can act on the set detection switch mechanism as the conveyor belt moves. Then, the detection switch mechanism is activated to start the electric lifting and supporting mechanism, which lifts and supports the torn position, thereby preventing the torn position from continuing to expand and becoming unrepairable due to the weight of the material.

[0017] 2. When an object that has a longitudinal tear in the conveyor belt passes through the detection switch mechanism, it can be effectively squeezed onto the set flip switch plate. The flip switch plate is deflected due to the squeeze and causes the pressure sensing switch to generate feedback. The pressure sensing switch then causes the electric telescopic rod of the electric lifting and supporting mechanism to run. The electric telescopic rod drives the set support plate to rise and contact the area below the tear in the conveyor belt, thus providing support.

[0018] 3. In this invention, the initial position of the flip switch plate is tilted and forms an opening with the mounting cavity, which facilitates the capture of material leakage caused by wear and tear of the conveyor belt when transporting small pieces or granular easily flowing fluid materials. It can also trigger the electric lifting and supporting mechanism for support.

[0019] 4. When the electric telescopic rod of the present invention lifts the lifting plate through the lifting frame, it pushes open the protective cover plate. After it is pushed open, the protective cover plate rotates back by the rebound force of the spring hinge, thereby abutting against the toothed groove on the lifting frame to achieve auxiliary support for the lifting frame. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the relative positional distribution between the detection and protection mechanism and the conveyor belt in this invention; Figure 3 yes Figure 2 A magnified schematic diagram of the partial structure at point A in the middle; Figure 4 This is a schematic diagram showing the relative positional distribution of the protective cover and the inverted V-shaped guide frame in this invention; Figure 5 This is a structural schematic diagram showing the relative positions of the support plate, protective cover plate, and mounting side plate in this invention; Figure 6 yes Figure 5 A magnified schematic diagram of the local structure at point B; Figure 7 This is a schematic diagram of the connection between the elastic cloth block and the mounting bridge in this invention. Figure 8 This is a schematic diagram of the state in which the lifting plate is raised to support the torn conveyor belt body in this invention.

[0021] Explanation of reference numerals in the attached figures: 1. Conveyor belt body; 11. Support frame; 2. Detection and protection mechanism; 21. Fixed crossbeam; 211. Ball bearing; 22. Mounting side plate; 23. Mounting cavity; 231. Through port; 232. Elastic cloth block; 24. Flip switch plate; 241. Pressure sensor switch one; 242. Diagonal rope; 25. Electric telescopic rod; 26. Lifting frame; 261. Inverted tooth groove; 27. Lifting plate; 271. Pressure sensor switch two; 3. Protective cover plate; 31. Connecting frame; 4. Inverted V-shaped guide frame. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0023] like Figures 1-8 As shown, a belt tear detection device for a belt conveyor is used to detect longitudinal tears in the belt. The device includes a detection and protection mechanism 2, which is disposed on the inner ring of the conveyor belt body 1 and distributed near the upper half of the conveyor belt body 1. It should be noted that multiple detection and protection mechanisms 2 can be evenly distributed along the conveying direction of the conveyor belt body 1. For V-shaped belt conveyors, two sets of inclined detection and protection mechanisms 2 can be symmetrically distributed on both sides of the V-shaped belt, so that the two sets of detection and protection mechanisms 2 are distributed in a V-shape based on the shape of the V-shaped belt, thereby facilitating the detection of possible longitudinal puncture tears in different segments. This solution is illustrated using a horizontal conveyor belt body 1 as an example. The detection and protection mechanism 2 includes a detection switch mechanism and an electric lifting and supporting mechanism. The detection switch mechanism is arranged parallel to the bottom of the conveying surface of the conveyor belt body 1. The detection switch mechanism is used to detect whether there is a longitudinal tear in the conveyor belt body 1. If so, the detection switch mechanism activates the electric lifting and supporting mechanism to lift and support the area below the tear in the conveyor belt body 1 to prevent further tearing due to the weight of the material or other reasons. If not, the electric lifting and supporting mechanism is kept in its original state. The electric lifting and supporting mechanism is electrically connected to the detection switch mechanism.

[0024] In some specific implementation schemes, refer to Figure 3As shown, the detection switch mechanism includes a fixed crossbeam 21, which is parallel to the bottom of the conveying surface of the conveyor belt body 1, allowing a certain gap to be maintained between the fixed crossbeam 21 and the bottom of the conveying surface of the conveyor belt body 1. The two ends of the fixed crossbeam 21 can be fixedly connected to the support frame 11 of the conveyor belt through pillars to keep the position fixed. A limit switch is provided on the fixed crossbeam 21, and an alarm electrically connected to the limit switch can be fixedly installed at both ends of the fixed crossbeam 21. It is not specifically shown in the figure. When there is a longitudinal tear on the conveyor belt body 1, the piercing sharp object or the downward leakage of material can act on the limit switch, and the limit switch can generate a sensing feedback, causing the alarm to sound. At the same time, for safety reasons, to prevent the tear from spreading further, the sensing feedback generated by the limit switch can also be sent to the controller of the conveyor, which generates a stop command to stop the entire conveyor in time.

[0025] Among them, reference Figure 5 and Figure 6 As shown, the limit switch includes a mounting side plate 22, a flip switch plate 24, and a pressure sensing switch 241. The mounting side plate 22 is vertically fixed to the side of the fixed crossbeam 21. The top of the mounting side plate 22 is nearly flush with the top of the fixed crossbeam 21. A mounting cavity 23 is provided on the mounting side plate 22 near the fixed crossbeam 21. The side of the mounting cavity 23 away from the fixed crossbeam 21 is open, and the bottom edge of the opening of the mounting cavity 23 is movably connected to the flip switch plate 24 through a spring-loaded hinge. The initial position of the mounting cavity 23 is in an inclined position, forming an opening to catch materials that fall from above. The pressure sensing switch 241 is installed on the side of the flip switch plate 24 near the inside of the mounting cavity 23, and the pressure sensing switch 241 is used to control the start of the electric lifting mechanism. In addition, the pressure sensing switch 241 is also electrically connected to an alarm.

[0026] It should be noted that, in order to prevent the flip switch plate 24 from excessively deflecting out of the mounting cavity 23, a diagonal rope 242 can be connected between the top of the flip switch plate 24 and the top of the mounting cavity 23 for limiting; in addition, in order to facilitate the flip switch plate 24 to flip into the mounting cavity 23 and effectively exert a squeezing effect on the pressure sensing switch 241 to generate feedback, the lateral width of the inner side of the mounting cavity 23 can be matched with the thickness of the flip switch plate 24 to ensure that it can be squeezed.

[0027] When a sharp object punctures and tears the conveyor belt 1 at a certain location, the end of the sharp object exposed at the bottom of the conveyor belt 1 moves with the conveyor belt 1 to the position of the limit switch. This pushes against the tilting switch plate 24, which tilts out of the mounting cavity 23, causing the tilting switch plate 24 to deflect and retract into the mounting cavity 23. This causes the pressure sensor switch 241, which is mounted on the mounting cavity 23, to be squeezed, triggering the alarm and stopping the conveyor in time. At the same time, the pressure sensor switch 241 causes the electric lifting mechanism to rise, providing support for the sharp object and preventing it from falling further and tearing during the maintenance process due to gravity. In addition, in the case of material leakage without puncture, the opening formed by the mounting cavity 23 and the tilting switch plate 24 can also catch the leaking material. This also acts on the pressure sensor switch 241, triggering the alarm and controlling the operation of the electric lifting mechanism.

[0028] In a further specific implementation plan, refer to Figure 6 and Figure 7 As shown, in order to facilitate the later cleaning of materials that have leaked into the installation cavity 23, and to prevent the pressure sensing switch 241 from being damaged by the leaked materials occupying space after the flip switch plate 24 is deflected, and to prevent affecting the operation of the subsequent electric lifting mechanism, an opening 231 is provided on the side of the installation cavity 23 near the fixed crossbeam 21, and there is a certain distance between the opening 231 and the fixed crossbeam 21. Multiple elastic cloth blocks 232 are distributed horizontally in the opening 231. Because the elastic cloth blocks 232 have a certain elasticity, they can deform after the pressure sensing switch 241 is pressed on them, thereby avoiding damage. At the same time, the adjacent elastic cloth blocks 232 can be pushed apart later to clean out the materials that have fallen into the installation cavity 23.

[0029] In some specific implementation schemes, refer to Figure 5 As shown, the electric lifting and supporting mechanism includes an electric telescopic rod 25, a lifting frame 26, and a lifting plate 27. The telescopic end of the electric telescopic rod 25 faces downward and is fixedly connected to the lifting frame 26. The lifting plate 27 is horizontally positioned below the limit switch, specifically so that the lifting plate 27 is horizontally positioned on the mounting side plate 22. The lifting plate 27 is fixedly connected to the lifting frame 26, and the lifting frame 26 is vertically positioned below the lifting plate 27. The electric telescopic rod 25 is electrically connected to the pressure sensing switch 241.

[0030] refer to Figure 8As shown, when the pressure sensor switch 241 is squeezed and generates feedback, the electric telescopic rod 25 retracts. The telescopic end of the electric telescopic rod 25 then drives the lifting plate 27 to rise through the lifting frame 26. The lifting plate 27 rises along the mounting side plate 22 and finally supports the object piercing the conveyor belt 1 or directly abuts against the conveyor belt 1 for support.

[0031] In some specific implementation schemes, two sets of limit switches, lifting frames 26 and lifting plates 27 are provided and symmetrically distributed on both sides of the fixed cross frame 21, so as to facilitate effective detection and protection when the conveyor belt 1 is running in the forward or reverse direction.

[0032] In some specific implementations, since the sharp object piercing the conveyor belt 1 may not be vertically downward, but may be at a specific downward angle, if the lifting plate 27 is used to push it vertically upward directly, the piercing object may deflect and further tear the conveyor belt 1. Therefore, a pressure sensing switch 271 can be installed on the upper surface of the lifting plate 27, and the pressure sensing switch 271, pressure sensing switch 241 and electric telescopic rod 25 are connected in series. The pressure sensing switch 271 is a normally closed switch and will open when squeezed, and the pressure sensing switch 241 is a normally open switch and will close when squeezed. When the lifting plate 27 rises and touches the bottom of the object that punctures the conveyor belt body 1, the pressure sensor switch 271 is squeezed, which disconnects the circuit controlling the operation of the electric telescopic rod 25, thus stopping the machine in time.

[0033] It should be noted that the circuit connecting the alarm and pressure sensor switch 241 is connected in parallel with the circuit connecting the electric telescopic rod 25 and pressure sensor switch 241. Even if pressure sensor switch 271 causes the circuit of the electric telescopic rod 25 to be disconnected, it will not affect the operation of the alarm.

[0034] In some specific implementations, to prevent the electric telescopic rod 25 from failing to effectively lift the lifting plate 27 due to leaked material falling onto the lifting plate 27 and pressing on the pressure sensing switch 271, reference is made to... Figure 5As shown, a connecting frame 31 is provided on the side of the limit switch near the lifting plate 27. The connecting frame 31 can be fixedly connected to the bottom of the mounting side plate 22 in the limit switch, and the two can be detachably connected, for example, by screws, or the end of the connecting frame 31 can slide laterally through the mounting side plate 22, and the two are connected by a limit spring. At the same time, a buckle is installed on the mounting side plate 22 to hold the connecting frame 31 in place. A protective cover plate 3 is movably connected to the side of the connecting frame 31 away from the limit switch by a spring hinge. The protective cover plate 3 is tilted and rests on the lifting plate 27. The protective cover plate 3 can cover the lifting plate 27 to prevent the material falling from the conveyor belt body 1 from falling onto the lifting plate 27 and pressing the pressure sensing switch 271. When the lifting plate 27 is raised, the protective cover plate 3 can be opened.

[0035] It should be noted that in the event of material leakage, when the electric telescopic rod 25 drives the lifting plate 27 to lift the protective cover 3, the material will inevitably have already leaked into the mounting cavity 23. That is, the leak location is above the opening formed by the mounting cavity 23 and the flip switch plate 24. Of course, this is for leaks of a certain size. If the leak is too large, the solution of setting pressure sensing switch 271 is not applicable, and the lifting plate 27 can be directly used for support. In general, when transporting small, free-flowing or granular materials, the wear and leakage of the conveyor belt 1 will not produce excessively large leaks. Therefore, when the lifting plate 27 lifts the protective cover 3, it will not be affected by the leaked material. At this time, the lifting plate 27 supports and lifts the area near the leak, preventing the formation of a funnel shape near the leak, which would cause the material to accumulate at the leak location and continue to leak out.

[0036] In a further specific implementation plan, combined with Figure 5 and Figure 8 As shown, the lifting frame 26 has multiple inverted grooves 261 longitudinally and equidistantly provided on the side near the protective cover plate 3, and the inverted grooves 261 are configured to cooperate with the protective cover plate 3. The lower part of the inverted grooves 261 is inclined, and the upper part is horizontal.

[0037] When the lifting frame 26 lifts the support plate 27 and pushes open the protective cover plate 3, the protective cover plate 3 springs back to its original position under the action of the spring-back hinge, so that it can easily abut against the side wall of the lifting frame 26 and contact the reverse tooth groove 261. The reverse tooth groove 261 and the protective cover plate 3 are engaged together, so that the lifting frame 26 can only be raised and cannot descend relative to the protective cover plate 3. This can prevent the support plate 27 from falling accidentally during the lifting process, so that the protective cover plate 3 plays an auxiliary support role.

[0038] When maintenance requires the lifting plate 27 to be lowered, the connecting frame 31 can be separated from the mounting side plate 22, allowing the protective cover plate 3 to disengage from the inverted tooth groove 261 on the lifting frame 26.

[0039] In some specific implementation schemes, refer to Figure 4 As shown, an inverted V-shaped guide frame 4 that cooperates with the protective cover plate 3 is fixedly connected to the connecting frame 31. When the leaked material falls onto the protective cover plate 3, the material can be guided to slide down into the inverted V-shaped guide frame 4 due to the inclined setting of the protective cover plate 3. Then, it is guided to slide out to both sides by the inverted V-shaped guide frame 4, so as to avoid falling into the inner ring of the conveyor belt body 1 and affecting the transmission operation.

[0040] In some specific implementation schemes, refer to Figure 4 As shown, multiple balls 211 are evenly distributed on the upper surface of the fixed crossbeam 21. The balls 211 are movably fitted into the surface of the fixed crossbeam 21. Although this can maintain a certain gap between the fixed crossbeam 21 and the conveyor belt 1, the weight of the material may cause the conveyor belt 1 to be stretched and deformed downwards, and may come into contact with the fixed crossbeam 21. To avoid continuous wear, the balls 211 are used to reduce wear.

[0041] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution will now be briefly explained in conjunction with specific application scenarios: During the operation of the conveyor belt 1, if a sharp object longitudinally punctures or tears the conveyor belt 1, the end of the object will protrude from the bottom of the conveying surface of the conveyor belt 1. As the conveyor belt 1 moves to the position of the limit switch, it will push the tilting switch plate 24, which tilts out of the mounting cavity 23, causing the tilting switch plate 24 to be pushed and deflected into the mounting cavity 23. This will cause the pressure sensing switch 241 set on the mounting cavity 23 to be squeezed, which can activate the alarm and stop the conveyor in time. In addition, in the case of material leakage without puncture, the opening formed by the mounting cavity 23 and the tilting switch plate 24 can also catch the leaked material, which can also act on the pressure sensing switch 241 to activate the alarm.

[0042] When the pressure sensor switch 241 is squeezed and feedback is generated, the electric telescopic rod 25 retracts. The telescopic end of the electric telescopic rod 25 then drives the lifting plate 27 to rise through the lifting frame 26. The lifting plate 27 rises along the mounting side plate 22 and finally supports the object piercing the conveyor belt 1 or directly abuts against the conveyor belt 1 to prevent further tearing due to the weight of the material during the shutdown and maintenance waiting process.

[0043] Furthermore, when the lifting plate 27 rises and touches the bottom of the object piercing the conveyor belt body 1, the pressure sensing switch 271 is squeezed, causing the circuit controlling the operation of the electric telescopic rod 25 to be disconnected, thus enabling the electric telescopic rod 25 to stop in time. This prevents the sharp object piercing the conveyor belt body 1 from being tilted downwards. If the lifting plate 27 pushes it directly vertically upwards, it will cause the piercing object to deflect and further tear the conveyor belt body 1.

[0044] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A belt tear detection device for a belt conveyor, characterized in that, Includes a detection and protection mechanism (2); the detection and protection mechanism (2) includes a detection switch mechanism and an electric lifting and supporting mechanism; The detection switch mechanism is arranged parallel to the bottom of the conveying surface of the conveyor belt body (1). The detection switch mechanism is used to detect whether there is a longitudinal tear in the conveyor belt body (1). When the detection switch mechanism detects that there is a tear in the conveyor belt body (1), it activates the electric lifting and supporting mechanism to raise and support the area below the tear position of the conveyor belt body (1).

2. The belt tear detection device for a belt conveyor according to claim 1, characterized in that, The detection switch mechanism includes a fixed crossbeam (21), which is parallel to the bottom of the conveying surface of the conveyor belt body (1); a limit switch is provided on the fixed crossbeam (21), and alarms electrically connected to the limit switches are fixedly installed at both ends of the fixed crossbeam (21).

3. A belt tear detection device for a belt conveyor according to claim 2, characterized in that, The limit switch includes a mounting side plate (22), a flip switch plate (24), and a pressure sensing switch (241). The mounting side plate (22) is vertically fixed to the side of the fixed crossbeam (21). The mounting side plate (22) has a mounting cavity (23) near the fixed crossbeam (21). The side of the mounting cavity (23) away from the fixed crossbeam (21) is open, and the bottom edge of the opening of the mounting cavity (23) is movably connected to the flip switch plate (24) through a spring-loaded hinge. The pressure sensing switch (241) is installed on the side of the flip switch plate (24) near the inside of the mounting cavity (23), and the pressure sensing switch (241) is used to control the start of the electric lifting mechanism. The pressure sensing switch (241) is also electrically connected to the alarm.

4. A belt tear detection device for a belt conveyor according to claim 3, characterized in that, The mounting cavity (23) has an opening (231) on the side near the fixed crossbeam (21), and multiple elastic cloth blocks (232) are distributed laterally in the opening (231).

5. A belt tear detection device for a belt conveyor according to claim 3, characterized in that, The electric lifting and supporting mechanism includes an electric telescopic rod (25), a lifting frame (26), and a lifting plate (27). The telescopic end of the electric telescopic rod (25) is fixedly connected to the lifting frame (26). The lifting plate (27) is horizontally positioned below the limit switch. The lifting plate (27) is fixedly connected to the lifting frame (26). The electric telescopic rod (25) is electrically connected to a pressure sensing switch (241).

6. A belt tear detection device for a belt conveyor according to claim 5, characterized in that, The limit switch, lifting frame (26) and lifting plate (27) are each provided in two sets and are symmetrically distributed on both sides of the fixed cross frame (21).

7. A belt tear detection device for a belt conveyor according to claim 5, characterized in that, The upper surface of the lifting plate (27) is equipped with a pressure sensing switch two (271), and the pressure sensing switch two (271), pressure sensing switch one (241) and electric telescopic rod (25) are electrically connected in series. The pressure sensing switch two (271) is a normally closed switch, and the pressure sensing switch one (241) is a normally open switch.

8. A belt tear detection device for a belt conveyor according to claim 5, characterized in that, A connecting frame (31) is provided on the side of the limit switch near the lifting plate (27); a protective cover plate (3) is movably connected to the side of the connecting frame (31) away from the limit switch via a spring hinge, and the protective cover plate (3) is tilted and rests on the lifting plate (27).

9. A belt tear detection device for a belt conveyor according to claim 8, characterized in that, The lifting frame (26) has multiple inverted grooves (261) longitudinally and equidistantly opened on the side near the protective cover plate (3), and the inverted grooves (261) are configured to cooperate with the protective cover plate (3).

10. A belt tear detection device for a belt conveyor according to claim 8, characterized in that, The connecting frame (31) is fixedly connected to an inverted V-shaped guide frame (4) that cooperates with the protective cover plate (3).

Images