A multi-stage material limiting device for a round pipe belt conveyor

Abstract

The present application relates to a kind of multi-stage material limiting device for round pipe belt conveyor, belong to round pipe belt conveyor technical field;Including conical cover, the conical cover is set above adhesive tape, conical cover is the hollow conical structure of front thick and rear thin, the lower end of conical cover remains open, the front of conical cover is provided with material limiting comb, the rear of conical cover is provided with material limiting gate, and the conical cover between material limiting comb and material limiting gate is provided with blockage detector;Material limiting comb includes first motor, rolling disc, and first motor drives rolling disc to rotate horizontally in the front inside of conical cover;Material limiting gate includes second motor, flap, and second motor drives flap to rotate up and down in the rear inside of conical cover;Solve the problem that the straight plate mechanical type material limiting device for round pipe belt conveyor is prone to block, deformation, low degree of automation currently.

Description

Technical Field

[0001] This invention belongs to the technical field of circular tube belt conveyors, and specifically relates to a multi-stage material limiting device for circular tube belt conveyors. Background Technology

[0002] The circular tube belt conveyor is a new type of bulk material conveying equipment that winds the conveyor belt into a circular tube shape. It enables long-distance, closed-loop conveying of bulk materials, adapts to complex terrain, and easily accommodates complex spatial turning arrangements. During transport, there is no spillage or dust generation, truly achieving environmentally friendly conveying. Due to the special structure of the circular tube belt conveyor, to prevent tube bursts and bulging, and to ensure its normal and continuous operation, strict control of the material flow rate and particle size entering the circular tube section is necessary. Existing material limiting devices are mostly simple, straight-plate mechanical types, which have the following five problems:

[0003] (1) During operation, large pieces of material are prone to blockage. Once blockage occurs, the material will flow out from both sides, causing serious spillage.

[0004] (2) When conveying materials with high viscosity, such as floating coal, the material is prone to sticking to the straight plate and causing blockage. After the blockage, it needs to be cleared manually, which is time-consuming and labor-intensive.

[0005] (3) After long-term operation, the straight plate limiting device will deform, leading to difficulty in operation or even failure;

[0006] (4) Large pieces of material stuck at the material limiting plate may scratch the tape, and may even cause longitudinal tearing of the tape;

[0007] (5) The existing material limiting device has a low degree of automation and poor adaptability, which restricts the development of circular tube belt conveyors.

[0008] In summary, the current material limiting devices have constrained the development of circular tube belt conveyors. Therefore, a new type of material limiting device is needed to solve the problem of material throughput and particle size control in the transportation of circular tube belt conveyors. Summary of the Invention

[0009] This invention overcomes the shortcomings of the prior art and proposes a multi-stage material limiting device for circular tube belt conveyors; it solves the problems of easy clogging, deformation and low automation of the straight plate mechanical material limiting devices currently used for circular tube belt conveyors.

[0010] To achieve the above objectives, the present invention is implemented through the following technical solution.

[0011] A multi-stage material limiting device for a circular tube belt conveyor includes a conical shroud positioned above the conveyor belt. The shroud is a hollow cone-shaped structure, wider at the front and narrower at the rear, with its lower end open. A material limiting comb is located at the front of the shroud, and a material limiting gate is located at the rear. A blockage detector is installed on the shroud between the material limiting comb and the material limiting gate. The material limiting comb includes a first motor and a roller, with the first motor driving the roller to rotate horizontally on the inner front side of the shroud. The material limiting gate includes a second motor and a flap, with the second motor driving the flap to rotate up and down on the inner rear side of the shroud.

[0012] Furthermore, the conical cover includes a cover body and a cover; the cover body includes a front part and a rear part, each of which is composed of two symmetrical, vertical sidewalls. The rear end edges of the two sidewalls of the front part are fixedly connected to the front end edges of the two sidewalls of the rear part, respectively; the distance between the front end edges of the two sidewalls of the front part is greater than the distance between the rear end edges; the distance between the front end edges of the two sidewalls of the rear part is equal to the distance between the rear end edges; the height of the area between the front end edges of the two sidewalls of the front part is higher than the height of the area between the rear end edges, and the height of the area between the front end edges of the two sidewalls of the rear part is equal to the height of the area between the rear end edges.

[0013] Furthermore, the cover includes two parts: a front part and a rear part. The front part is fixedly disposed between the upper edges of the two side walls of the front part of the cover, and the rear part is fixedly disposed between the upper edges of the two side walls of the rear part of the cover.

[0014] Furthermore, the material limiting comb also includes a driving sprocket, a driven sprocket, a chain, and a roller; the first motor is fixedly installed in the middle of the upper end face of the front of the cover, and a driving sprocket is fixedly installed on the output shaft of the first motor; the roller is rotatably connected between the two side walls of the front of the cover in the left and right horizontal direction, one end of the roller extends to the outside of the cover and a driven sprocket is fixedly installed at the extended end, and the driving sprocket and the driven sprocket are connected by a chain.

[0015] Furthermore, the roller is sleeved on the outside of the roller shaft. The roller includes multiple toothed discs and a disc sleeve. The disc sleeve is sleeved on the outside of the roller shaft, and the roller shaft and the disc sleeve are connected by a key. The multiple toothed discs are evenly arranged along the axial direction of the disc sleeve and fixed on the outer surface of the disc sleeve. The outer edge of each toothed disc is evenly provided with multiple serrations along the circumference, and the tip of each serration faces the same direction as the rotation direction of the roller.

[0016] Furthermore, the blockage detector includes a housing, a touch plate, and a micro switch; a detection port is provided on the side wall of the conical cover, the housing is fixedly disposed on the outside of the detection port, and the lower end face of the housing remains open; the touch plate is rotatably connected to the inside of the housing, and the micro switch is fixedly disposed on the inner side of the outer side wall of the housing, with the touch plate in contact with the micro switch.

[0017] Furthermore, the limiting gate also includes a housing, a driving gear, a driven gear, a screw, an indexing frame, and a proximity switch; the housing is fixedly mounted on the upper surface of the rear of the cover, and the driving gear and the driven gear are rotatably connected inside the housing; the second motor is fixedly mounted on the housing, and the output shaft of the second motor extends into the housing and is fixedly connected to the driving gear; a vertical screw is screwed into the fixing hole of the driven gear, and the lower end of the screw extends vertically downward into the inner side of the rear of the cover; a through-hole is provided at the lower end of the screw.

[0018] Furthermore, the flap is located on the inner side of the rear of the cover, and the front edge of the flap is the pivot of the flap. The pivot of the flap is horizontally arranged in the left and right direction, and the two ends of the pivot of the flap are rotatably connected to the two side walls of the rear of the cover. Two lugs are fixedly provided on the upper end face of the flap, and an elongated hole is symmetrically provided on the two lugs. The connecting hole at the lower end of the screw is located between the elongated holes of the two lugs. A connecting pin passes through the two elongated holes and the connecting hole in sequence to connect the screw to the two lugs.

[0019] Furthermore, one end of the hinge of the flip plate extends to the outer side of the rear of the cover, and an indexing frame is fixedly installed at the extended end. The indexing frame is an arc-shaped plate structure, and the pointed corner of the indexing frame is fixedly connected to the hinge of the flip plate. Multiple U-shaped clearance grooves are evenly arranged along the arc-shaped edge of the indexing frame. A proximity switch is fixedly installed on the outer side of the left sidewall of the rear of the cover, and the proximity switch is located in the clearance groove of the indexing frame.

[0020] Furthermore, there are two rollers, which are parallel to each other and have the same structure; the roller shaft of the rear roller extends to the outside of the cover and is connected to the driven sprocket, while the roller shaft of the front roller is rotatably connected to the inside of the cover. The roller shafts of the front roller and the rear roller are connected by a synchronous belt drive mechanism.

[0021] The beneficial effects of this invention compared to the prior art are as follows:

[0022] (1) The multi-stage limiting device of the circular tube belt conveyor provided by the present invention gradually converges, cuts and squeezes the material to prevent the material from exerting too much force on the limiting device and causing the limiting device to deform.

[0023] (2) The multi-stage limiting device for the circular tube belt conveyor provided by the present invention has a rotating roller and a belt running in opposite directions. The distance between the lower tangent of the roller and the belt is less than the maximum particle size specified by the tube belt conveyor, so as to prevent large pieces of material from passing through or getting stuck at the multi-stage limiting device.

[0024] (3) The multi-stage material limiting device for the circular tube belt conveyor provided by the present invention automatically adjusts the flip plate angle through automated logic control, and automatically limits the material and handles faults of the material limiting device.

[0025] (4) The multi-stage limiting device for the circular tube belt conveyor provided by the present invention has a unique conical structure and multi-stage limiting method to prevent the continuous accumulation of sticky materials from causing material blockage and to achieve effective limiting of sticky materials. Attached Figure Description

[0026] The present invention will now be described in further detail with reference to the accompanying drawings:

[0027] Figure 1 This is a front view of the entire embodiment one;

[0028] Figure 2 This is a top view of the entire embodiment one;

[0029] Figure 3 yes Figure 1 AA section view in the middle;

[0030] Figure 4 This is a schematic diagram of the roller's structure;

[0031] Figure 5 This is a front view of the cone-shaped shield;

[0032] Figure 6 This is a top view of the cone-shaped cover;

[0033] Figure 7 This is a side view of the cone-shaped cover;

[0034] Figure 8 This is a schematic diagram of the blockage detector;

[0035] Figure 9 yes Figure 2 BB section view in the middle;

[0036] Figure 10 yes Figure 9 CC section view in the middle;

[0037] Figure 11 This is a schematic diagram showing the relative relationship between the indexing frame and the proximity switch;

[0038] Figure 12 This is a structural schematic diagram of Embodiment 2;

[0039] Figure 13 This is a schematic diagram illustrating the relative motion between the material guide comb and large pieces of material.

[0040] Among them, 1 is a conical cover, 2 is a material limiting comb, 3 is a blockage detector, 4 is a material limiting gate, 5 is a material guide chute, 6 is a conveyor belt, 7 is the front part of the cover, 8 is the rear part of the cover, 9 is the front part of the cover, 10 is the rear part of the cover, 11 is the first motor, 12 is the driving sprocket, 13 is the driven sprocket, 14 is a chain, 15 is a roller, 16 is a roller disc, 17 is a disc sleeve, 18 is a gear disc, 19 is a detection port, 20 is a shell, 21 is a touch plate, 22 is a micro switch, 23 is a housing, 24 is the second motor, 25 is a driving gear, 26 is a driven gear, 27 is a screw, 28 is a flap, 29 is a support lug, 30 is a connecting pin, 31 is an indexing frame, 32 is a proximity switch, and 33 is a clearance groove. Detailed Implementation

[0041] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0042] Example 1

[0043] like Figure 1 As shown in Figure 12, this embodiment provides a multi-stage material limiting device for a circular tube belt conveyor, including a conical cover 1, a material limiting comb 2, a blockage detector 3, and a material limiting gate 4.

[0044] The conical cover 1 is positioned above the conveyor belt 6 and includes a cover body and a cover. The cover body comprises a front part 7 and a rear part 8, each consisting of two symmetrical, vertical sidewalls. The rear edges of the two sidewalls of the front part 7 are fixedly connected to the front edges of the two sidewalls of the rear part 8. The distance between the front edges of the two sidewalls of the front part 7 is greater than the distance between the rear edges; the distance between the front edges of the two sidewalls of the rear part 8 is equal to the distance between the rear edges; the height of the area between the front edges of the two sidewalls of the front part 7 is greater than the height of the area between the rear edges, and the height of the area between the front edges of the two sidewalls of the rear part 8 is equal to the height of the area between the rear edges. The area between the front edges of the two sidewalls of the front part 7 is the large port of the conical cover 1, and the area between the rear edges of the two sidewalls of the rear part 8 is the small port of the conical cover 1. The large port of the conical cover 1 is fixedly connected to the outlet of the conveyor belt's guide chute 5. The cover includes two parts: a front part 9 and a rear part 10. The front part 9 is fixedly disposed between the upper edges of the two side walls of the front part 7 of the cover, and the rear part 10 is fixedly disposed between the upper edges of the two side walls of the rear part 8 of the cover.

[0045] The material limiting comb 2 is located at the front part 7 of the cover and includes a first motor 11, a driving sprocket 12, a driven sprocket 13, a chain 14, a roller 15, and a disc 16. The first motor 11 is fixedly located at the middle of the upper end face of the front part 9 of the cover, and the driving sprocket 12 is fixedly mounted on the output shaft of the first motor 11. The roller 15 is rotatably connected between the two side walls of the front part 7 of the cover in a horizontal direction. The two ends of the roller 15 are rotatably connected to the two side walls of the front part 7 of the cover through bearing seats. One end of the roller 15 extends to the outside of the right side wall of the front part 7 of the cover and a driven sprocket 13 is fixedly mounted on the extended end. The driving sprocket 12 and the driven sprocket 13 are connected by a chain 14. The roller 16 is fitted onto the outside of the roller shaft 15. The roller 16 includes multiple toothed discs 18 and a disc sleeve 17. The disc sleeve 17 is a cylindrical structure with open ends, fitted onto the outside of the roller shaft 15. The roller shaft 15 and the disc sleeve 17 are connected by a key. The multiple toothed discs 18 are evenly arranged along the axial direction of the disc sleeve 17 and fixed on the outer surface of the disc sleeve 17. The outer edge of each toothed disc 18 is evenly provided with multiple serrations along its circumference, and the tip of each serration faces the same direction as the rotation of the roller 16. The first motor 11 drives the drive sprocket 12 to rotate. The drive sprocket 12 drives the driven sprocket 13 to rotate through the chain 14. The driven sprocket 13 drives the roller shaft 15 to rotate synchronously. The roller shaft 15 drives the outer roller 16 to rotate inside the front part 7 of the cover. The rotation direction of the roller 16 is opposite to the running direction of the conveyor belt 6.

[0046] The blockage detector 3 is located at the rear end of the left sidewall of the front part 7 of the cover, and includes a housing 20, a touch plate 21, and a micro switch 22. A square detection port 19 is provided at the middle height of the rear end of the left sidewall of the front part 7 of the cover. The housing 20 is fixedly disposed on the outside of the detection port 19, and the housing 20 is connected to the inside of the front part 7 of the cover through the detection port 19; the lower end face of the housing 20 remains open. The touch plate 21 is rotatably connected to the inside of the housing 20. The pivot of the touch plate 21 is located at the upper edge of the touch plate 21, and the pivot is horizontally arranged along the front-back direction, located at the junction between the top wall and the outer wall. The micro switch 22 is fixedly disposed on the inner side of the outer wall of the housing 20, and the touch plate 21 is in contact with the micro switch 22. When the material inside the enclosure accumulates to the detection port 19, the material enters the outer shell 20 through the detection port 19 and applies pressure to the touch plate 21. After the touch plate 21 is under pressure, it presses down the micro switch 22. The micro switch 22 sends a signal to the controller, which then knows that a blockage has occurred inside the conical enclosure 1.

[0047] The limiting gate 4 is located at the rear of the conical cover 1 and includes a housing 23, a second motor 24, a driving gear 25, a driven gear 26, a screw 27, a flap 28, an indexing frame 31, and a proximity switch 32. The housing 23 is fixedly mounted on the upper surface of the rear part 10 of the cover. The driving gear 25 and the driven gear 26 are rotatably connected inside the housing 23. The second motor 24 is fixedly mounted on the housing 23. The output shaft of the second motor 24 extends into the housing 23 and is fixedly connected to the driving gear 25. The second motor 24 drives the driving gear 25 to rotate synchronously. A vertical screw 27 is screwed into the fixing hole of the driven gear 26. The lower end of the screw 27 extends vertically downward into the inner side of the rear part 8 of the cover. A through-hole is provided at the lower end of the screw 27. The flap 28 is located inside the rear part 8 of the cover. The front edge of the flap 28 serves as its pivot, which is horizontally positioned in the left-right direction. Both ends of the pivot are rotatably connected to the side walls of the rear part 8. Two lugs 29 are fixedly mounted on the upper surface of the flap 28. Each lug has a symmetrically arranged elongated hole. The connecting hole at the lower end of the screw 27 is located between the elongated holes of the two lugs 29. A connecting pin 30 passes through the two elongated holes and the connecting hole in sequence to connect the screw 27 to the two lugs 29. One end of the pivot of the flap 28 extends to the outer side of the left side wall of the rear part 8, and a dividing frame 31 is fixedly mounted on the extended end. The dividing frame 31 is an arc-shaped plate structure. The pointed corner of the dividing frame 31 is fixedly connected to the pivot of the flap 28. Multiple U-shaped clearance grooves 33 are evenly arranged along the arc-shaped edge of the dividing frame 31. A proximity switch 32 is fixedly installed on the outer side of the left side wall of the rear part 8 of the cover. The proximity switch 32 is located in the clearance groove 33 of the indexing frame 31. The current angle of the flip plate 28 is detected by detecting the clearance groove 33 of the indexing frame 31 through the proximity switch 32.

[0048] The working principle of this invention is as follows:

[0049] Material is fed onto conveyor belt 6 via the guide chute 5 of the belt conveyor, and moves synchronously from front to back along with the conveyor belt 6. The first motor 11 drives the roller 16 to rotate via the chain 14 transmission mechanism. The rotation direction of the roller 16 is opposite to the running direction of the material on the conveyor belt 6. Since the front of the conical cover 1 is a gradually converging conical structure, the material gradually converges on the inner side of the front of the conical cover 1. When the material passes the roller 16, the material above the lower tangent of the roller 16 will be cut flat by the rotating roller 16 and thrown back to the front, thus achieving the first stage of material limiting.

[0050] After passing the roller 16, the material continues to move backward. When the material accumulates on the inner side of the front of the conical cover 1, the material leaks from the detection port 19 into the housing 20 of the blockage detector 3. The material touches the touch plate 21, which pushes the micro switch 22 to activate, causing the micro switch 22 to send a material blockage signal to the controller.

[0051] When the controller receives a material blockage signal, it sends an angle position signal to the material limiting gate 4. At this time, the flap 28 is in the lowest position. After receiving the signal, the material limiting gate 4 causes the flap 28 to rotate upward by an angle of the clearance groove 33.

[0052] When the limiting gate 4 receives an upward rotation signal, the second motor 24 drives the drive gear 25 to rotate synchronously. The drive gear 25 drives the driven gear 26 to rotate, and the screw 27 moves upward inside the driven gear 26. The screw 27 drives the lower edge of the flap 28 to rotate upward through the connecting pin 30. As the flap 28 rotates inside the rear of the conical cover 1, the material on the conveyor belt 6 is squeezed and limited.

[0053] The rotation angle of the flip plate 28 is controlled by the indexing frame 31. When the flip plate 28 rotates, its shaft rotates synchronously, thereby driving the indexing frame 31 to rotate synchronously. When the indexing frame 31 rotates past a clearance groove 33 with the flip plate 28, the rotation stops. If the blockage signal still exists after the flip plate 28 runs at the current angle for 30 to 60 seconds, the flip plate 28 continues to rotate upward by an angle of clearance groove 33, and the indexing frame 31 rotates by a clearance groove 33 accordingly.

[0054] After the blockage signal disappears, the flap 28 rotates downward by the angle of the clearance groove 33. If no blockage signal is received after 30 to 60 seconds, the flap 28 is controlled to continue rotating downward by the angle of the clearance groove 33 until the flap 28 returns to its initial state. If the flap 28 receives a blockage signal again during its downward rotation, the flap 28 is controlled to rotate upward by the angle of the clearance groove 33.

[0055] Through the above logic control, the material limiting gate 4 has the function of automatically adjusting the angle of the flap 28 to achieve the optimal material limiting height, thereby realizing the second level of material limiting.

[0056] The rotation direction of the roller 16 is opposite to the running direction of the material on the conveyor belt 6, dynamically blocking large pieces of material and preventing them from getting stuck at the limiting comb 2, which would cause subsequent material spillage. This also protects the limiting gate 4 during operation. At the same time, the large pieces of material are tumbled in the opposite direction under the action of the roller 16 and the conveyor belt 6. The large pieces of material are broken due to mutual collisions, and finally reach the size allowed to pass through the limiting comb 2.

[0057] Example 2

[0058] like Figure 13 As shown, as another embodiment of the present invention, the structure is the same as that in Embodiment 1, except that two parallel and identical rollers 16 are provided on the inner side of the front part of the conical cover 1. The rear roller 16 has the same structure as the roller 16 in Embodiment 1. The front roller 16 is located above the front side of the rear roller 16. The roller shaft 15 of the front roller 16 and the roller shaft 15 of the rear roller 16 are connected by a synchronous belt drive mechanism to rotate synchronously.

[0059] Specifically, a driving synchronous pulley is fixedly installed on the roller shaft 15 of the rear roller 16, and a driven synchronous pulley is fixedly installed on the roller shaft 15 of the front roller 16. The driving synchronous pulley and the driven synchronous pulley are connected by a synchronous belt for phase transmission.

[0060] The distance between the lower tangent of the two rollers 16 and the surface of the belt 6 is less than the maximum material particle size that the circular tube belt conveyor is allowed to pass through, so as to prevent large pieces of material from clogging the limiting comb 2, and at the same time prevent large pieces of material from entering the circular tube section of the circular tube belt conveyor and causing operational failure.

[0061] By setting two rollers 16, two-stage material limiting before the material limiting gate 4 can be achieved.

[0062] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A multi-stage material limiting device for a circular tube belt conveyor, characterized in that: The device includes a conical cover (1) positioned above the conveyor belt (6). The conical cover (1) is a hollow conical structure that is thicker at the front and thinner at the back. The lower end of the conical cover (1) remains open. A limiting comb (2) is provided at the front of the conical cover (1), and a limiting gate (4) is provided at the rear of the conical cover (1). A blockage detector (3) is provided on the conical cover (1) between the limiting comb (2) and the limiting gate (4). The limiting comb (2) includes a first motor (11) and a roller (16). The first motor (11) drives the roller (16) to rotate horizontally on the inner side of the front of the conical cover (1). The rotation direction of the roller (16) is opposite to the running direction of the conveyor belt (6). The limiting gate (4) includes a second motor (24) and a flap (28). The second motor (24) drives the flap (28) to rotate up and down on the inner side of the rear of the conical cover (1). The blockage detector (3) includes a housing (20), a touch plate (21), and a micro switch (22); a detection port (19) is provided on the side wall of the conical cover (1), the housing (20) is fixedly disposed on the outside of the detection port (19), and the lower end face of the housing (20) remains open; the touch plate (21) is rotatably connected to the inside of the housing (20), and the micro switch (22) is fixedly disposed on the inner side of the outer side wall of the housing (20), and the touch plate (21) is in contact with the micro switch (22); The limiting gate (4) also includes a housing (23), a drive gear (25), a driven gear (26), a screw (27), an indexing frame (31), and a proximity switch (32). The housing (23) is fixedly installed on the upper surface of the rear part (10) of the cover. The housing (23) is rotatably connected with the drive gear (25) and the driven gear (26) meshing with each other. The second motor (24) is fixedly installed on the housing (23). The output shaft of the second motor (24) extends into the housing (23) and is fixedly connected to the drive gear (25). A vertical screw (27) is screwed into the fixing hole of the driven gear (26). The lower end of the screw (27) extends vertically downward into the inner side of the rear part (8) of the cover. A connecting hole that runs through the left and right is provided at the lower end of the screw (27). The flap (28) is located on the inner side of the rear part (8) of the cover. The front edge of the flap (28) is the pivot of the flap (28). The pivot of the flap (28) is horizontally arranged along the left and right direction. The two ends of the pivot of the flap (28) are rotatably connected to the two side walls of the rear part (8) of the cover. Two lugs (29) are fixedly provided on the upper end face of the flap (28). A long oval hole is symmetrically provided on the two lugs (29). The connecting hole at the lower end of the screw (27) is located between the long oval holes of the two lugs (29). A connecting pin (30) passes through the two long oval holes and the connecting hole in sequence to connect the screw (27) to the two lugs (29). One end of the rotating shaft of the flip plate (28) extends to the outside of the rear part (8) of the cover, and a dividing frame (31) is fixedly installed at the extended end. The dividing frame (31) is an arc-shaped plate structure. The sharp corner of the dividing frame (31) is fixedly connected to the rotating shaft of the flip plate (28). Multiple U-shaped clearance grooves (33) are evenly arranged on the arc-shaped edge of the dividing frame (31). A proximity switch (32) is fixedly installed on the outer side of the left side wall of the rear part (8) of the cover. The proximity switch (32) is located in the clearance groove (33) of the dividing frame (31).

2. A multi-stage material limiting device for a circular tube belt conveyor according to claim 1, characterized in that: The conical cover (1) includes a cover body and a cover; the cover body includes a front part (7) and a rear part (8), both of which are composed of two symmetrical, vertical side walls. The rear edges of the two side walls of the front part (7) are fixedly connected to the front edges of the two side walls of the rear part (8); the distance between the front edges of the two side walls of the front part (7) is greater than the distance between the rear edges; the distance between the front edges of the two side walls of the rear part (8) is equal to the distance between the rear edges; the height of the area between the front edges of the two side walls of the front part (7) is higher than the height of the area between the rear edges, and the height of the area between the front edges of the two side walls of the rear part (8) is equal to the height of the area between the rear edges.

3. A multi-stage material limiting device for a circular tube belt conveyor according to claim 2, characterized in that: The cover includes two parts: a front part (9) and a rear part (10). The front part (9) is fixedly disposed between the upper edges of the two side walls of the front part (7) of the cover body, and the rear part (10) is fixedly disposed between the upper edges of the two side walls of the rear part (8) of the cover body.

4. A multi-stage material limiting device for a circular tube belt conveyor according to claim 3, characterized in that: The limiting comb (2) also includes a drive sprocket (12), a driven sprocket (13), a chain (14), and a roller (15); the first motor (11) is fixedly installed in the middle of the upper end face of the front part (9) of the cover, and the drive sprocket (12) is fixedly installed on the output shaft of the first motor (11); the roller (15) is rotatably connected between the two side walls of the front part (7) of the cover in the left and right horizontal direction, one end of the roller (15) extends to the outside of the cover and the driven sprocket (13) is fixedly installed at the extended end, and the drive sprocket (12) and the driven sprocket (13) are connected by a chain (14).

5. A multi-stage material limiting device for a circular tube belt conveyor according to claim 4, characterized in that: The roller (16) is sleeved on the outside of the roller shaft (15). The roller (16) includes multiple toothed discs (18) and a disc sleeve (17). The disc sleeve (17) is sleeved on the outside of the roller shaft (15). The roller shaft (15) and the disc sleeve (17) are connected by a key. The multiple toothed discs (18) are evenly arranged along the axial direction of the disc sleeve (17) and fixed on the outer surface of the disc sleeve (17). The outer edge of each toothed disc (18) is evenly provided with multiple serrations along the circumference. The tip of each serration faces the same direction as the rotation of the roller (16).

6. A multi-stage material limiting device for a circular tube belt conveyor according to claim 5, characterized in that: There are two rollers (16), which are parallel to each other and have the same structure. The roller shaft (15) of the rear roller (16) extends to the outside of the cover and is connected to the driven sprocket (13). The roller shaft (15) of the front roller (16) is rotatably connected to the inside of the cover. The roller shaft (15) of the front roller (16) and the roller shaft (15) of the rear roller (16) are connected by a synchronous belt drive mechanism.

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