Anti-reverse roller of belt conveyor

Abstract

The application belongs to the technical field of backstop, and particularly relates to a reverse prevention roller of a belt conveyor, which comprises a roller, a connecting shaft, a first backstop and a second backstop, wherein the roller is fixedly connected with the connecting shaft; the first backstop is linked with the second backstop through a linkage assembly; when the backstop belt moves towards the roller, a limiting assembly is released from limiting, a guide cover moves, and the outer surface of a limiting column is in contact with the inner annular wall of a fixed seat. The first backstop and the second backstop are linked to achieve a staged braking effect. In the initial stage of slight reverse, the first backstop acts first, and frictional resistance is generated by the intervention of the backstop belt between the roller and the conveying belt; when the reverse trend intensifies and the first backstop cannot stop alone, the second backstop is triggered, and stronger braking force is provided by mechanical jamming of the limiting column and the fixed seat.

Description

Technical Field

[0001] This invention belongs to the field of backstop technology, specifically relating to an anti-reverse roller for a belt conveyor. Background Technology

[0002] Belt conveyors, as common continuous conveying equipment, are widely used in industries such as mining, ports, power, and chemicals for transporting bulk materials. During operation, especially when conveying materials at an inclined upward direction, the conveyor belt and the material it carries may experience reverse sliding or "reverse rotation" under the influence of gravity due to reasons such as power interruption, overload, or brake failure.

[0003] To prevent such reverse-run accidents, the industry typically installs backstop devices at the drive unit or driven roller. Common backstop devices include roller backstops, shaped block backstops, and ratchet-pawl mechanisms. While these traditional devices can provide some anti-reverse protection, they have some inherent drawbacks. For example, in roller backstops or similar structures, although the backstop elements (such as rollers or wedges) are theoretically inactive during normal forward operation, they may still have slight contact with the running parts or be in a critical standby state. This generates continuous running resistance, increases additional energy consumption, and causes wear between the backstop element and mating parts, shortening service life. Furthermore, they usually require a dedicated lubrication system for maintenance, resulting in a complex structure and high maintenance costs. On the other hand, some backstop structures based on frictional resistance, while providing braking during reverse, may also have their braking elements maintaining a large contact area with the belt during forward operation, generating unnecessary frictional resistance and wear, affecting conveying efficiency and reducing belt life. Therefore, there is an urgent need for an anti-reverse device that can minimize running resistance and wear when the equipment is running in the forward direction, and can provide rapid and reliable graded braking protection when reversal occurs. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides an anti-reverse roller for a belt conveyor. This roller aims to solve the problems of existing belt conveyor backstop devices, such as high resistance and rapid wear during normal forward operation, and potential delays or insufficient braking force when reversing.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] An anti-reverse roller for a belt conveyor includes a roller, a connecting shaft, a first backstop, and a second backstop, wherein the roller is fixedly connected to the connecting shaft;

[0007] The first backstop includes a fixed frame, a drive belt, and a backstop belt. One end of the drive belt is fixedly connected to the fixed frame, and the fixed frame is provided with a baffle that cooperates with the drive belt. The backstop belt is slidably connected to the fixed frame, and the backstop belt is provided with a protrusion. When the roller reverses, the drive belt pushes the protrusion, causing the backstop belt to move toward the roller.

[0008] The second backstop includes a fixed base, a limiting wheel, and a guide cover; the limiting wheel is disposed inside the fixed base, and a connecting shaft passes through the fixed base and connects to the limiting wheel; the limiting wheel is provided with several limiting grooves, and each limiting groove is provided with a limiting post; the guide cover is slidably connected to the fixed base, and a spring assembly is provided at the sliding connection; a limiting assembly is provided between the guide cover and the fixed base; a ball head is fixedly connected to the end of the limiting post, and a guide groove that mates with the ball head is provided inside the guide cover;

[0009] The first backstop is connected to the second backstop via a linkage assembly. When the backstop belt moves toward the roller, the linkage assembly controls the limit assembly to release the limit, and the guide cover moves, so that the outer surface of the limit post contacts the inner ring wall of the fixed seat.

[0010] A push plate is fixedly connected to the end of the drive belt, and the protrusion is pushed by the push plate.

[0011] The fixed frame is provided with a sliding groove, and the anti-reverse belt is provided with a guide rod that is slidably connected to the sliding groove.

[0012] The limiting assembly includes a connecting plate and a limiting plate. The connecting plate is slidably connected to the fixed base, and a limiting spring is provided between the connecting plate and the fixed base. The limiting plate is fixedly connected to the connecting plate, and the guide cover is provided with a slot that cooperates with the limiting plate.

[0013] A sliding plate is slidably connected to the fixed base, and a pin is provided between the sliding plate and the fixed base; the sliding plate contacts the connecting plate, restricting the downward movement of the connecting plate; the contact surface between the sliding plate and the connecting plate is an inclined surface.

[0014] The linkage component includes a linkage rod and a support column. The support column is fixedly connected to both the fixed frame and the fixed base. The linkage rod is slidably connected to the support column. The pin is fixedly connected to the linkage rod and the linkage rod is pushed to move by the guide rod.

[0015] There is a gap between the ends of the guide rod and the linkage rod; after the guide rod moves a certain distance, it contacts the end of the linkage rod and pushes the linkage rod to move.

[0016] A guide pin is fixedly connected to the fixed frame, and an arc-shaped opening groove connected to the guide pin is provided on the anti-reverse belt; a graphite bushing is provided in the guide groove.

[0017] The spring assembly includes a guide rod and a support spring. The guide rod is fixedly connected to the guide cover, the fixed seat is slidably connected to the guide rod, and the support spring is sleeved on the outside of the guide rod.

[0018] A side plate is rotatably connected to the fixed base, and the side plate is provided with a connecting groove that is slidably connected to the limiting post.

[0019] The limiting post is equipped with a baffle plate, which blocks the connecting groove.

[0020] Compared with the prior art, the beneficial effects of this invention are:

[0021] By setting up a first backstop and a second backstop and linking them together, a graded braking effect is achieved. In the initial stage of slight reverse movement, the first backstop activates first, using the backstop belt to intervene in the gap between the roller and the conveyor belt to generate frictional resistance. When the reverse trend intensifies and the first backstop cannot stop it alone, the second backstop is triggered, providing stronger braking force through the mechanical locking of the limit post and the fixed seat. During forward operation, only a small area of ​​contact between the first backstop and the drive belt and the conveyor belt exists, while a gap exists between the limit post of the second backstop and the inner ring wall of the fixed seat, significantly reducing running resistance and wear.

[0022] The first backstop detects reverse rotation and directly triggers the second backstop through the mechanical linkage components (linkage rod, pin). It requires no external power or complex sensor control, responds quickly, and operates reliably, ensuring the timeliness of anti-reverse rotation protection.

[0023] When the second check valve is running in the forward direction, the limit post does not contact the inner ring wall of the fixed seat, eliminating the need for special lubricating oil between the two. Ordinary lubrication or self-lubrication by using graphite bushings is only required at the ball head and guide groove, which reduces maintenance complexity and cost.

[0024] In the first backstop, the guide pin and the arc-shaped opening groove work together to ensure that the backstop belt is supported and lifted during forward operation, avoiding contact with the conveyor belt; in the linkage assembly, the guide rod and the linkage rod have a pre-reserved gap at their ends to prevent the backstop belt from being subjected to linkage resistance when it initially moves, ensuring that it can smoothly extend into the braking position.

[0025] The first backstop provides initial friction braking, while the second backstop provides ultimate mechanical locking. The two work together to form a double anti-reverse protection, which greatly improves the safety and reliability of the belt conveyor operation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the overall structure after omitting the rollers and belts;

[0028] Figure 3 yes Figure 2 A schematic diagram of the structure from another direction shown;

[0029] Figure 4 This is a partial sectional view of the second check valve;

[0030] Figure 5 This is a schematic diagram of the structure of some components in the second backstop;

[0031] Figure 6 yes Figure 1 A longitudinal sectional view of the structure shown;

[0032] Figure 7 yes Figure 6 A magnified view of a section at point A in the middle;

[0033] Figure 8 yes Figure 1 A cross-sectional view of the structure shown;

[0034] Figure 9 yes Figure 8 A magnified view of a section at point B in the middle;

[0035] Figure 10 This is a partial sectional view of the second check valve including the baffle.

[0036] Wherein: 1 is a roller, 2 is a connecting shaft, 3 is the first backstop, 30 is a fixed frame, 31 is a drive belt, 32 is a backstop belt, 33 is a baffle, 34 is a protrusion, 35 is a push plate, 36 is a slide groove, 37 is a guide rod, 38 is a guide pin, 39 is an arc-shaped opening groove, 4 is the second backstop, 40 is a fixed seat, 400 is the inner ring wall, 41 is a limiting wheel, 42 is a guide cover, 43 is a limiting inclined groove, 44 is a limiting post, and 45 is a spring assembly. Components: 450 is the guide rod, 451 is the support spring, 46 is the limiting assembly, 460 is the connecting plate, 461 is the limiting plate, 462 is the limiting spring, 463 is the slot, 464 is the sliding plate, 465 is the pin, 47 is the ball head, 48 is the guide groove, 49 is the side plate, 410 is the connecting groove, 411 is the baffle, 412 is the graphite bushing, 413 is the contact surface, 5 is the linkage assembly, 50 is the linkage rod, 51 is the support column, and 6 is the conveyor belt. Detailed Implementation

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] like Figures 1 to 5As shown, an anti-reverse roller for a belt conveyor includes a roller 1, a connecting shaft 2, a first backstop 3, and a second backstop 4. The roller 1 is fixedly connected to the connecting shaft 2. The connecting shaft 2 is connected to the frame (bearing housing) of the belt conveyor.

[0039] The first backstop 3 includes a fixed frame 30, a drive belt 31, and a backstop belt 32. The fixed frame 30 is fixed on the frame of the belt conveyor; specifically, it can be connected by bolts, and the fixed frame 30 is provided with corresponding connection holes.

[0040] One end of the drive belt 31 is fixedly connected to the fixed frame 30. The fixed frame 30 is provided with a baffle 33 that cooperates with the drive belt 31. The drive belt 31 contacts the conveyor belt 6 of the belt conveyor. When the roller 1 rotates clockwise (forward), under the traction (using friction) of the conveyor belt 6 of the belt conveyor, the drive belt 31 is driven to move and contact the baffle 33, and the movement of the drive belt 31 is restricted by the baffle 33.

[0041] The anti-reverse belt 32 is slidably connected to the fixed frame 30, and the anti-reverse belt 32 is provided with a protrusion 34. When the drum 1 rotates counterclockwise, under the traction (using friction) of the conveyor belt 6 of the belt conveyor, the drive belt 31 moves in the opposite direction. The drive belt 31 pushes the protrusion 34 to move the anti-reverse belt 32 toward the drum 1. The anti-reverse belt 32 extends between the drum 1 and the conveyor belt 6, thereby preventing the drum 1 from rotating in the opposite direction.

[0042] With the above structural arrangement, when the roller 1 rotates in the forward direction, only the drive belt 31 contacts the conveyor belt 6. The contact area is small, which can reduce the obstruction or wear on the operation of the conveyor belt 6. When the roller 1 rotates in the reverse direction, the anti-reverse belt 32 can increase the resistance in time to prevent it from rotating in the reverse direction.

[0043] The second backstop 4 includes a fixed base 40, a limiting wheel 41, and a guide cover 42; the limiting wheel 41 is disposed inside the fixed base 40, and the connecting shaft 2 passes through the fixed base 40 and is connected to the limiting wheel 41 (key connection); when the connecting shaft 2 rotates, it will drive the limiting wheel 41 to rotate together.

[0044] The limiting wheel 41 is provided with several limiting grooves 43, and each limiting groove 43 is provided with a limiting post 44; the guide cover 42 is slidably connected to the fixed base 40, and a spring assembly 45 is provided at the sliding connection; a limiting assembly 46 is provided between the guide cover 42 and the fixed base 40. When the limiting assembly 46 is in the limiting state, the elastic element in the spring assembly 45 has elastic potential energy; when the limiting assembly 46 is unlocked, the elastic element in the spring assembly 45 releases elastic potential energy, causing the guide cover 42 to move.

[0045] A ball head 47 is fixedly connected to the end of the limiting post 44. A guide groove 48, which mates with the ball head 47, is provided inside the guide cover 42. The guide groove 48 has an annular structure. When the guide cover 42 moves, the contact area between the ball head 47 and the guide groove 48 changes, thereby altering the position of the limiting post 44. When the roller 1 rotates forward, there is a gap between the limiting post 44 and the inner annular wall 400 of the fixed seat 40. The limiting post 44 is located at the wide part of the limiting groove 43 and does not obstruct the rotation of the connecting shaft 2 and the limiting wheel 41. Moreover, since the limiting post 44 does not contact the inner annular wall 400 of the fixed seat 40 during forward rotation, compared to common ball-type backstops, the need for special lubricating oil between the limiting post 44 and the fixed seat 40 can be eliminated. Ordinary lubricating oil is sufficient between the ball head 47 and the guide groove 48.

[0046] The first backstop 3 is linked with the second backstop 4 through the linkage assembly 5. When the backstop belt 32 moves toward the roller 1 (i.e. the roller 1 rotates in the opposite direction), the linkage assembly 5 causes the limiting assembly 46 to release its limit. The elastic element in the spring assembly 45 releases its elastic potential energy, causing the guide cover 42 to move away from the fixed seat 40. The contact part between the ball head 47 and the guide groove 48 (from the inside to the outside) changes, and the limiting post 44 moves toward the inner ring wall 400.

[0047] When the resistance applied by the anti-reverse belt 32 is insufficient to stop the roller 1 and the connecting shaft 2, the contact portion between the ball head 47 and the guide groove 48 changes, causing the outer surface of the limiting post 44 to contact the inner ring wall 400 of the fixed seat 40. Therefore, the rotation of the connecting shaft 2 at this time will cause the limiting wheel 41 to rotate in the opposite direction (the limiting post 44 will be located in the narrow part of the limiting groove 43). Since the outer surface of the limiting post 44 is in contact with the inner ring wall 400 of the fixed seat 40, the limiting post 44 will be stuck between the limiting wheel 41 and the inner ring wall 400 of the fixed seat 40, thereby preventing the limiting wheel 41, the connecting shaft 2 and the roller 1 from rotating in the opposite direction.

[0048] By using the linkage structure of the first backstop 3 and the second backstop 4, when the first backstop 3 cannot completely prevent the roller 1 from rotating in the reverse direction, the second backstop 4 can be used to increase the resistance and further prevent the roller 1 from rotating in the reverse direction.

[0049] Furthermore, such as Figure 8 and Figure 9 As shown, in order to better push the anti-reverse belt 32, a push plate 35 is fixedly connected to the end of the drive belt 31, and the protrusion 34 is pushed by the push plate 35.

[0050] Furthermore, such as Figure 2As shown, various structures can be used to achieve a sliding connection between the anti-backflow belt 32 and the fixed frame 30; specifically, the fixed frame 30 is provided with a sliding groove 36, and a guide rod 37 that is slidably connected to the sliding groove 36 is fixed on the anti-backflow belt 32. When the anti-backflow belt 32 moves, the guide rod 37 will also move accordingly.

[0051] Furthermore, such as Figures 2 to 7 As shown, the limiting component 46 includes a connecting plate 460 and a limiting plate 461. The connecting plate 460 is slidably connected to the fixed base 40, and a limiting spring 462 is provided between the connecting plate 460 and the fixed base 40. The limiting plate 461 is fixedly connected to the connecting plate 460, and the guide cover 42 is provided with a slot 463 that cooperates with the limiting plate 461.

[0052] A sliding plate 464 is slidably connected to the fixed base 40. A pin 465 is provided between the sliding plate 464 and the fixed base 40, and corresponding pin seats are provided on the sliding plate 464 and the fixed base 40. The contact surface 413 between the sliding plate 464 and the connecting plate 460 is an inclined surface.

[0053] When the pin 465 is engaged with the two pin seats, the slide plate 464 contacts the connecting plate 460 and restricts the movement of the connecting plate 460. At this time, the limiting spring 462 is in a pre-compressed state, and the limiting plate 461 is inserted into the slot 463. When the pin 465 is not engaged with the two pin seats, the limiting spring 462 releases its elastic potential energy. Through the cooperation of the inclined plane, the connecting plate 460 exerts a pushing force on the slide plate 464, causing the slide plate 464 to move away from the bottom of the connecting plate 460 and no longer obstruct the movement of the connecting plate 460. At this time, the connecting plate 460 and the limiting plate 461 will move downward, causing the limiting plate 461 to move out of the slot 463. The elastic element in the spring assembly 45 releases its elastic potential energy, causing the guide cover 42 to move away from the fixed seat 40.

[0054] Furthermore, such as Figures 1 to 3 As shown, the linkage assembly 5 includes a linkage rod 50 and a support column 51. The support column 51 is fixedly connected to both the fixed frame 30 and the fixed base 40. The linkage rod 50 is slidably connected to the support column 51, and the pin 465 is fixedly connected to the linkage rod 50. When the anti-reverse belt 32 and the guide rod 37 move, the guide rod 37 pushes the linkage rod 50 and the pin 465 to move, causing the pin 465 to separate from the two pin seats (not in the insertion state).

[0055] Furthermore, such as Figure 2 As shown, there is a gap between the ends of the guide rod 37 and the linkage rod 50; after the guide rod 37 moves a certain distance, it contacts the end of the linkage rod 50 and pushes the linkage rod 50 to move. This structure can prevent the anti-reverse belt 32 from being resisted by the linkage component 5 and the limiting component 46 when it starts to move.

[0056] Furthermore, such as Figure 8 and Figure 9 As shown, a guide pin 38 is fixedly connected to the fixed frame 30, and an arc-shaped opening groove 39 connected to the guide pin 38 is provided on the anti-backflow belt 32. The cooperation between the guide pin 38 and the arc-shaped opening groove 39 can support the anti-backflow belt 32 and prevent the anti-backflow belt 32 from contacting the conveyor belt 6 when the roller 1 rotates in the forward direction. When the anti-backflow belt 32 moves, the guide pin 38 will fall off the arc-shaped opening groove 39, and the anti-backflow belt 32 will fall down and contact the conveyor belt 6 under gravity.

[0057] Furthermore, such as Figure 4 and Figure 7 As shown, in order to reduce resistance, a graphite bushing 412 is provided in the guide groove 48. After using the graphite bushing 412, no lubricating oil needs to be added between the guide groove 48 and the ball head 47.

[0058] Furthermore, such as Figure 2 and Figure 4 As shown, the spring assembly 45 includes a guide rod 450 and a support spring 451 (elastic element). The guide rod 450 is fixedly connected to the guide cover 42, and the fixed seat 40 is slidably connected to the guide rod 450. The support spring 451 is sleeved on the outside of the guide rod 450, and the two ends of the support spring 451 abut against the guide cover 42 and the fixed seat 40 respectively.

[0059] Furthermore, such as Figure 4 and Figure 10 As shown, a side plate 49 is rotatably connected to the side of the fixed base 40 near the guide cover 42. The side plate 49 is provided with a connecting groove 410 that is slidably connected to the limiting post 44. The side plate 49 can support the limiting post 44. The limiting post 44 is provided with a baffle 411, which blocks the connecting groove 410. The limiting post 44 passes through the connecting groove 410 and is fixedly connected to the ball head 47.

[0060] Of course, a side plate 49 can also be provided on the other side of the fixed base 40; and two guide covers 42 can be provided, located on both sides of the fixed base 40 respectively, and two other components connected to the guide covers 42 are also provided accordingly; that is, both sides of the limiting post 44 will be constrained by the guide cover 42 and the side plate 49.

[0061] The above description only illustrates preferred embodiments of the present invention, but the present invention is not limited to the above embodiments.

Claims

1. An anti-reverse roller for a belt conveyor, characterized in that: It includes a roller (1), a connecting shaft (2), a first backstop (3) and a second backstop (4), wherein the roller (1) is fixedly connected to the connecting shaft (2); The first backstop (3) includes a fixed frame (30), a drive belt (31) and a backstop belt (32). One end of the drive belt (31) is fixedly connected to the fixed frame (30). The fixed frame (30) is provided with a baffle (33) that cooperates with the drive belt (31). The backstop belt (32) is slidably connected to the fixed frame (30). The backstop belt (32) is provided with a protrusion (34). When the roller (1) reverses, the drive belt (31) pushes the protrusion (34) to make the backstop belt (32) move toward the roller (1). The second backstop (4) includes a fixed base (40), a limiting wheel (41), and a guide cover (42); the limiting wheel (41) is disposed inside the fixed base (40), and the connecting shaft (2) passes through the fixed base (40) and is connected to the limiting wheel (41); the limiting wheel (41) is provided with a plurality of limiting grooves (43), and each limiting groove (43) is provided with a limiting post (44); the guide cover (42) is slidably connected to the fixed base (40), and a spring assembly (45) is provided at the sliding connection; a limiting assembly (46) is provided between the guide cover (42) and the fixed base (40); a ball head (47) is fixedly connected to the end of the limiting post (44), and a guide groove (48) that cooperates with the ball head (47) is provided inside the guide cover (42); The first backstop (3) is connected to the second backstop (4) through the linkage assembly (5). When the backstop belt (32) moves toward the roller (1), the linkage assembly (5) controls the limit assembly (46) to release the limit, and the guide cover (42) moves, so that the outer surface of the limit post (44) contacts the inner ring wall (400) of the fixed seat (40).

2. The anti-reverse roller of a belt conveyor according to claim 1, characterized in that: The end of the drive belt (31) is fixedly connected to a push plate (35), which pushes the protrusion (34).

3. The anti-reverse roller of a belt conveyor according to claim 1, characterized in that: The fixed frame (30) is provided with a sliding groove (36), and the anti-reverse belt (32) is provided with a guide rod (37) that is slidably connected to the sliding groove (36).

4. The anti-reverse roller of a belt conveyor according to claim 3, characterized in that: The limiting component (46) includes a connecting plate (460) and a limiting plate (461). The connecting plate (460) is slidably connected to the fixed base (40), and a limiting spring (462) is provided between the connecting plate (460) and the fixed base (40). The limiting plate (461) is fixedly connected to the connecting plate (460), and the guide cover (42) is provided with a slot (463) that cooperates with the limiting plate (461). A sliding plate (464) is slidably connected to the fixed base (40), and a pin (465) is provided between the sliding plate (464) and the fixed base (40); the sliding plate (464) contacts the connecting plate (460) to restrict the connecting plate (460) from moving downward; the contact surface (413) between the sliding plate (464) and the connecting plate (460) is an inclined surface.

5. The anti-reverse roller of a belt conveyor according to claim 4, characterized in that: The linkage component (5) includes a linkage rod (50) and a support column (51). The support column (51) is fixedly connected to both the fixed frame (30) and the fixed seat (40). The linkage rod (50) is slidably connected to the support column (51). The pin (465) is fixedly connected to the linkage rod (50). The linkage rod (50) is pushed to move by the guide rod (37).

6. The anti-reverse roller of a belt conveyor according to claim 5, characterized in that: There is a gap between the ends of the guide rod (37) and the linkage rod (50); after the guide rod (37) moves a certain distance, it contacts the end of the linkage rod (50) and pushes the linkage rod (50) to move.

7. The anti-reverse roller of a belt conveyor according to claim 1, characterized in that: The fixed frame (30) is fixedly connected to a guide pin (38), and the anti-reverse belt (32) is provided with an arc-shaped opening groove (39) connected to the guide pin (38); the guide groove (48) is provided with a graphite bushing (412).

8. The anti-reverse roller of a belt conveyor according to claim 1, characterized in that: The spring assembly (45) includes a guide rod (450) and a support spring (451). The guide rod (450) is fixedly connected to the guide cover (42), the fixed seat (40) is slidably connected to the guide rod (450), and the support spring (451) is sleeved on the outside of the guide rod (450).

9. The anti-reverse roller of a belt conveyor according to claim 1, characterized in that: A side plate (49) is rotatably connected to the fixed base (40), and a connecting groove (410) is provided on the side plate (49) that is slidably connected to the limiting post (44).

10. The anti-reverse roller of a belt conveyor according to claim 9, characterized in that: The limiting post (44) is provided with a baffle (411) to block the connecting groove (410).

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