Belt tensioner and belt conveyor

Abstract

The utility model relates to the technical field of belt conveyor, provide a belt tensioning device and belt conveyor, the belt tensioning device includes: fixed frame is used for arranging first cylinder, movable frame is used for arranging second cylinder, and the waist type hole is formed on movable frame, limiting piece is connected with fixed frame in one end, and the other end extends into the waist type hole, adjusting screw rod is connected with movable frame in one end, and the other end is movably connected with fixed frame, adjusting nut is adjusted nut, is connected in screw on adjusting screw rod, is connected with fixed frame to cooperate adjusting screw rod drive movable frame moves along the length direction of waist type hole in the process that adjusting nut moves on adjusting screw rod. The belt tensioning device realizes tensioning through rotating the position of adjusting nut on adjusting screw rod. This transmission mode is simple and direct to operate, and only needs to use common tool to rotate nut. When rotating adjusting nut, the moving amount of movable frame can be saved and accurately controlled.

Description

Technical Field

[0001] This utility model relates to the field of belt conveyor technology, and in particular to a belt tensioning device and a belt conveyor. Background Technology

[0002] Mobile crushing and screening equipment, due to its high integration (combining receiving, crushing, conveying, and screening functions) and strong mobility, has been widely used in municipal engineering, quarries, and solid waste treatment. This type of equipment needs to achieve complex material flow within a limited space, and the belt conveyor, as a material transfer component, directly affects the overall efficiency of the machine.

[0003] Traditional belt conveyor tensioning devices are mainly divided into fixed tensioning devices and automatic tensioning devices. Fixed tensioning devices fix the tension by adjusting the screw or counterweight during initial installation, but cannot dynamically compensate for belt elongation during use, easily leading to slippage and misalignment. Automatic tensioning devices, while capable of dynamic adjustment, are complex in structure, expensive, and poorly adaptable to the frequent vibrations of mobile equipment. Especially in space-constrained and high-vibration environments such as mobile crushing plants, existing technologies struggle to balance structural compactness, adjustment accuracy, and reliability. Therefore, there is an urgent need to develop a belt tensioning solution that combines ease of operation with high stability. Utility Model Content

[0004] This utility model provides a belt tensioning device and a belt conveyor to solve the problem that existing belt tensioning devices are difficult to balance in terms of structural compactness, adjustment accuracy and reliability.

[0005] This utility model provides a belt tensioning device, which is installed on a belt conveyor including a first roller, a second roller and a belt, wherein the belt is used to be sleeved on the outside of the first roller and the second roller;

[0006] The belt tensioning device includes:

[0007] A fixed frame is used to house the first roller;

[0008] A movable frame for mounting a second roller, the movable frame having a slotted hole formed along the extension direction of the belt;

[0009] The limiting member has one end connected to the fixed frame and the other end extending into the waist-shaped hole;

[0010] The adjusting screw is connected at one end to the movable frame and at the other end to the fixed frame.

[0011] An adjusting nut, threadedly connected to the adjusting screw and connected to the fixed frame, is used to move the movable frame along the length direction of the oblong hole as the adjusting nut moves on the adjusting screw, so that the movable frame moves relative to the fixed frame along the belt extension direction.

[0012] According to the present invention, a belt tensioning device is provided, wherein the movable frame includes: two opposing adjustable side plates, and the second roller is arranged between the two adjustable side plates;

[0013] Each of the adjustable side plates has at least one waist-shaped hole, and multiple limiting members are provided accordingly. One end of each limiting member is connected to the fixed frame, and the other end of each limiting member extends into the corresponding waist-shaped hole.

[0014] According to the belt tensioning device provided by this utility model, two adjusting screws and two adjusting nuts are provided respectively; one end of each of the two adjusting screws is connected to the corresponding adjusting side plate, and the other end is movably connected to both ends of the fixed frame; the two adjusting nuts are threadedly connected to the corresponding adjusting screws.

[0015] According to the present invention, a belt tensioning device is provided, wherein an adjusting plate is connected to the fixed frame, and a fixed plate is connected to the adjusting side plate;

[0016] One end of the adjusting screw is fixedly connected to the adjusting side plate via the fixing plate, and the other end of the adjusting screw passes through the adjusting plate; the adjusting plate is slidable on the adjusting screw relative to the axial direction of the adjusting screw.

[0017] According to the belt tensioning device provided by this utility model, the limiting member includes:

[0018] The T-shaped sleeve has one end connected to the fixed frame and the other end extending into the waist-shaped hole;

[0019] A bolt and a retaining ring, wherein the bolt passes through the retaining ring and is threaded to the T-shaped sleeve, thereby pressing the retaining ring against the outer wall of the oblong hole.

[0020] According to the present invention, a belt tensioning device is provided in which the adjusting screw extends along the length direction of the waist-shaped hole.

[0021] According to the present invention, a belt conveyor is provided, comprising: a first roller, a second roller, a belt, and a belt tensioning device;

[0022] The belt is sleeved on the outside of the first roller and the second roller. The first roller is connected to the fixed frame, and the second roller is connected to the movable frame.

[0023] According to the present invention, a belt conveyor is provided, wherein the belt is annularly sleeved outside the first roller and the second roller;

[0024] The belt conveyor also includes:

[0025] The first idler roller is rotatably supported below the horizontal load-bearing section of the belt;

[0026] The second idler roller is rotatably and inclinedly disposed on both sides of the horizontal bearing section of the belt;

[0027] The third idler roller is rotatably supported below the return section of the belt.

[0028] According to the present invention, a belt conveyor is provided, wherein the first roller is a driven roller and the second roller is a driving roller;

[0029] The belt conveyor also includes a drive unit, the drive end of which is connected to the drive roller.

[0030] According to the present invention, a belt conveyor further includes:

[0031] A cleaner is mounted on the movable frame, and the working end of the cleaner is pressed against the contact surface of the belt corresponding to the second roller.

[0032] The belt tensioning device and belt conveyor provided by this utility model achieve tensioning by rotating the position of the adjusting nut on the adjusting screw. This transmission method is simple and intuitive to operate, requiring only the use of common tools (such as a wrench) to rotate the nut. Rotating the adjusting nut allows for effortless and precise control of the movement of the movable frame (including the second roller), thereby achieving quantitative and fine adjustment of the belt tension. Furthermore, after adjustment, due to the existence of thread friction, the adjusting nut is less likely to automatically loosen or retract on the adjusting screw, effectively ensuring that the set belt tension can be maintained stably and continuously during equipment operation vibration or load changes, preventing belt slippage or tooth skipping due to loosening, and reducing maintenance requirements. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the belt conveyor provided by this utility model.

[0035] Figure 2 This is a schematic diagram of a belt tensioning device installed in a belt conveyor provided by this utility model.

[0036] Figure 3 This is a schematic diagram of one side of the belt tensioning device provided by this utility model.

[0037] Figure 4 This is a schematic diagram of the other side of the belt tensioning device provided by this utility model.

[0038] Figure label:

[0039] 1. Belt tensioning device; 11. Fixed frame; 111. Adjusting plate; 12. Movable frame; 121. Adjusting side plate; 122. Fixed plate; 13. Adjusting screw; 14. Adjusting nut; 15. T-sleeve; 16. Bolt; 17. Retaining ring; 18. Mounting plate; 2. First roller; 3. Second roller; 4. Belt; 5. First idler; 6. Second idler; 7. Third idler; 8. Drive unit; 9. Cleaner; 10. Bearing seat. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0041] The following is combined with Figures 1-4 The present invention describes a belt tensioning device 1 and a belt conveyor. The belt tensioning device 1 is installed on a belt conveyor including a first roller 2, a second roller 3 and a belt 4. The belt 4 is annular and is used to be sleeved on the outside of the first roller 2 and the second roller 3. The belt tensioning device 1 achieves precise control of the tension of the belt 4 through mechanical linkage.

[0042] This application provides a belt tensioning device 1, such as... Figures 1 to 4As shown, the belt tensioning device 1 includes: a fixed frame 11, a movable frame 12, a limiting member, an adjusting screw 13, and an adjusting nut 14. The fixed frame 11 is used to house the first roller 2; the movable frame 12 is used to house the second roller 3, and a slotted hole is formed on the movable frame 12 along the extension direction of the belt 4; one end of the limiting member is connected to the fixed frame 11, and the other end extends into the slotted hole; one end of the adjusting screw 13 is connected to the movable frame 12, and the other end is movably connected to the fixed frame 11; the adjusting nut 14 is threadedly connected to the adjusting screw 13 and connected to the fixed frame 11.

[0043] In this embodiment, the fixed frame 11 is the reference fixing component of the entire tensioning device, mainly used to support and fix the first roller 2. The first roller 2 is usually a detour roller. The movable frame 12, as a movable component of the belt tensioning device 1, can move in a guided manner relative to the fixed frame 11, and its main function is to support and install the second roller 3. The second roller 3 is usually a drive roller.

[0044] A slotted hole is provided at a suitable location on the movable frame 12 (typically near the area connected to the fixed frame 11). This slotted hole extends along the direction of the belt 4, which is commonly referred to as the belt 4 running direction or centerline direction. The slotted hole provides a precisely guided linear movement path within a defined range. Its length determines the maximum adjustment stroke of the movable frame 12 (together with the second roller 3).

[0045] One end of the limiting member (usually the fixed end) is rigidly connected to the fixed frame 11 (e.g., by welding, bolt 16 fastening, etc.). This connection point serves as the reference point for subsequent adjustment movements. The other end (free end) of the limiting member extends and passes through the oblong hole on the movable frame 12. The movable frame 12 is strictly limited to translational movement along the length direction of the oblong hole (i.e., parallel to the center line of the belt 4), preventing it from shifting or wobbling in other directions (such as the vertical direction, horizontal torsional direction). One end of the adjusting screw 13 is connected to the movable frame 12, and the other end is movably connected to the fixed frame 11. The adjusting nut 14 is tightly threaded onto the external thread of the adjusting screw 13.

[0046] When adjusting the belt tensioning device 1, the adjusting nut 14 is rotated, and the adjusting nut 14 rotates on the adjusting screw 13. The adjusting nut 14 acts on the fixed frame 11. Since the movable frame 12 is connected to the adjusting screw 13, the movable mechanism moves relative to the movable frame 12 under the interaction of the adjusting nut 14 and the adjusting screw 13. Under the limit of the limiting member, the adjusting nut 14 cooperates with the adjusting screw 13 to drive the movable frame 12 to move along the length direction of the waist-shaped hole, so that the movable frame 12 moves relative to the fixed frame 11 along the extension direction of the belt 4.

[0047] At the same time, by adjusting the rotation direction and the rotating ring of the adjusting nut 14, the direction and distance of the displacement of the adjusting nut 14 along the adjusting screw 13 can be adjusted, thereby precisely adjusting the tension of the belt 4.

[0048] The belt tensioning device 1 provided by this utility model achieves tensioning by rotating the adjusting nut 14 on the adjusting screw 13. This transmission method is simple and intuitive to operate, requiring only the use of common tools to rotate the nut. Rotating the adjusting nut 14 allows for effortless and precise control of the movement of the movable frame 12, thereby achieving quantitative and fine adjustment of the belt tension 4. Moreover, after adjustment, due to the existence of thread friction, the adjusting nut 14 is not prone to automatically loosening or retracting on the adjusting screw 13, effectively ensuring that the set belt tension 4 can be maintained stably for a long time under equipment vibration or load changes, preventing the belt 4 from slipping or skipping teeth due to loosening, and reducing maintenance requirements.

[0049] In some embodiments, such as Figures 1 to 4 As shown, the movable frame 12 includes: two opposing adjustable side plates 121, with a second roller 3 placed between the two adjustable side plates 121; each adjustable side plate 121 has at least one waist-shaped hole, and multiple limiting members are provided accordingly, with one end of each limiting member connected to the fixed frame 11, and the other end of each limiting member extending into the corresponding waist-shaped hole.

[0050] In this embodiment, the main body of the movable frame 12 consists of two identical, relatively parallel adjusting side plates 121. Each adjusting side plate 121 has four oblong holes, and each adjusting side plate 121 has four corresponding limiting members. These oblong holes are arranged parallel to each other (or on the same straight line), and the oblong holes are distributed on the side plates along the extension direction of the belt 4. One end of each limiting member is rigidly fixed to the fixed frame 11. For multiple limiting members on the same adjusting side plate 121, their fixing ends must be precisely aligned at their mounting points on the fixed frame 11 to ensure that their axes are parallel and consistent with the direction of movement. The other end of each limiting member extends and precisely passes through the corresponding oblong hole.

[0051] These limiting components work synchronously to ensure that the adjusting side plate 121 can only move smoothly along the common axis of all the waist-shaped holes, and effectively share the constraint of lateral loads and resist torsional tendencies. The limiting components on both sides of the adjusting side plate 121 work independently but in concert. This set of multi-point guides distributed on both sides together constitutes an extremely stable and torsional-resistant guide frame, ensuring that the two adjusting side plates 121 can only perform translational movements, and that this movement is strictly limited in space to a predetermined path. Even under the bias load of the belt 4 or vibration impact, it can prevent the movable frame 12 from twisting, tilting or locally jamming to the greatest extent.

[0052] To ensure stability on both sides, two adjusting screws 13 and two adjusting nuts 14 are provided respectively. One end of each adjusting screw 13 is connected to the corresponding adjusting side plate 121, and the other end is movably connected to both ends of the fixed frame 11. Two adjusting nuts 14 are threadedly connected to the corresponding adjusting screws 13. Each adjusting nut 14 engages with a corresponding adjusting screw 13 (threaded connection), forming two independent and identical helical transmission pairs, symmetrically distributed on both sides of the belt tensioning device 1 (usually corresponding to the outer sides of the two adjusting side plates 121 of the movable frame 12), and mirror-arranged with the central symmetry plane of the movable frame 12 as the reference.

[0053] When adjusting the tension, the operator should rotate both adjusting nuts 14 simultaneously (or as close to synchronously as possible). The direction of rotation (same direction) and the number of rotations (same number of turns) must be completely consistent. Generally, a double-ended wrench or a special synchronous wrench kit is used. The rotating adjusting nut 14 drives the corresponding adjusting screw 13 to move axially in a linear motion through the thread. The forces of equal magnitude and same direction at both drive points jointly drive the entire movable frame 12 to move linearly.

[0054] In some embodiments, such as Figures 1 to 4 As shown, an adjusting plate 111 is connected to the fixed frame 11, and a fixed plate 122 is connected to the adjusting side plate 121. One end of the adjusting screw 13 is fixedly connected to the adjusting side plate 121 via the fixed plate 122, and the other end of the adjusting screw 13 passes through the adjusting plate 111. The adjusting plate 111 is on the adjusting screw 13 and is slidable relative to the axial direction of the adjusting screw 13. When the adjusting nut 14 rotates on the adjusting screw 13, the adjusting nut 14 connects to the adjusting plate 111, and together with the adjusting screw 13, drives the movable frame 12 to move along the length direction of the oblong hole, so that the movable frame 12 moves relative to the fixed frame 11 along the extension direction of the belt 4.

[0055] In this embodiment, one or more fixing plates 122 are rigidly fixedly connected to each adjusting side plate 121 (usually on its outer side, at a position convenient for installation and force transmission). The fixing plate 122 serves as a rigid extension force-bearing point of the movable frame 12 (adjusting side plate 121) and is used to directly bear the thrust or pull force from the adjusting screw 13.

[0056] One or more adjusting plates 111 are rigidly fixedly connected to the corresponding position on the fixed frame 11. The adjusting plate 111 has a guide hole that matches the adjusting screw 13. This guide hole is not a threaded hole, but a smooth through hole or bushing structure. The diameter of the guide hole is slightly larger than the outer diameter of the smooth part of the adjusting screw 13, and the inner wall is usually smooth to greatly reduce sliding friction resistance.

[0057] One end of the adjusting screw 13 is fixedly connected to the fixed plate 122 of the movable frame 12 in a non-movable manner. At this connection point, the screw and the fixed plate 122 / adjusting side plate 121 are completely fixed into a whole, and the axial movement of the screw will be directly transmitted to the movable frame 12. The other end of the adjusting screw 13 passes through the guide hole of the adjusting plate 111 on the fixed frame 11.

[0058] The rotating adjusting nut 14 (driven by a thread) moves axially along the adjusting screw 13. During this axial movement, the adjusting nut 14 acts directly on the adjusting plate 111. The axial force exerted by the adjusting nut 14 on the adjusting plate 111 is transmitted to the fixed frame 11 through the adjusting plate 111. Since the adjusting plate 111 is firmly mounted on the fixed frame 11, the force of the nut is equivalent to acting on the fixed frame 11. The axial force exerted by the adjusting nut 14 also exerts an equal and opposite force on the adjusting screw 13. Because the other end of the adjusting screw 13 is fixedly connected to the fixed plate 122 of the movable frame 12, this opposing axial force is transmitted to the fixed plate 122 of the movable frame 12 through the adjusting screw 13.

[0059] When the adjusting nut 14 is rotated to generate an axial force that drives the movable frame 12 away from the fixed frame 11, the adjusting nut 14 exerts a pulling force on the adjusting plate 111 (away from the movable frame 12). Simultaneously, according to the action-reaction principle, the adjusting nut 14 applies a pushing force to the adjusting screw 13 (pointing towards the movable frame 12). This pushing force, through the fixed connection point, pushes the fixed plate 122 (i.e., the movable frame 12) away from the fixed frame 11. When the adjusting nut 14 is rotated to generate an axial force that drives the movable frame 12 closer to the fixed frame 11, the adjusting nut 14 exerts a pulling force on the adjusting plate 111. Simultaneously, it applies a pulling force to the adjusting screw 13. This pulling force, through the fixed connection point, pulls the fixed plate 122 (i.e., the movable frame 12) closer to the fixed frame 11.

[0060] Based on the above embodiments, in some embodiments, such as Figures 1 to 4 As shown, the limiting components include: a T-sleeve 15, a bolt 16, and a retaining ring 17. One end of the T-sleeve 15 is connected to the fixed frame 11, and the other end extends into the oblong hole; the bolt 16 passes through the retaining ring 17 and is threadedly connected to the T-sleeve 15, so that the retaining ring 17 is pressed against the outer wall of the oblong hole.

[0061] Specifically, the T-sleeve 15 consists of a coaxially arranged base section and a guide section. The base section is rigidly fixed to the fixed frame 11 by welding or bolts 16. The guide section passes through the oblong hole on the adjusting side plate 121 and maintains a clearance fit with it, ensuring that the movable frame 12 slides smoothly along a predetermined path. The end of the guide section away from the base section has an internal threaded hole for engaging with the bolt 16. The retaining ring 17 is an annular metal washer with an inner diameter slightly larger than the diameter of the bolt 16 rod and an outer diameter larger than the width of the oblong hole, serving to limit and distribute the load.

[0062] During assembly, first insert the guide section of the T-sleeve 15 into the oblong hole, so that the base section fits against the surface of the fixed frame 11; then, place the retaining ring 17 onto the bolt 16. After the bolt 16 passes through the retaining ring 17, screw it into the internal threaded hole of the T-sleeve 15. By tightening the bolt 16, the retaining ring 17 is tightly pressed against the outer wall of the adjusting side plate 121 (i.e., the edge of the oblong hole), thereby axially clamping the movable frame 12 between the retaining ring 17 and the base of the T-sleeve 15. At this time, the retaining ring 17 and the base of the T-sleeve 15 form a double constraint, which not only prevents the movable frame 12 from moving axially along the guide section, but also suppresses lateral swaying through the friction between the retaining ring 17 and the outer wall of the oblong hole, further improving the guiding stability. During disassembly and maintenance, the movable frame 12 can be quickly released simply by loosening the bolt 16, making the operation convenient.

[0063] When adjusting the tension of belt 4, first loosen bolt 16 and retaining ring 17. Then, rotate the two adjusting nuts 14 on both sides respectively. The adjusting nuts 14 drive the two adjusting side plates 121 through bolt 16, and the T-shaped sleeve 15 slides in the oblong hole, unlocking the forward and backward movement of the second roller 3. After that, rotating the adjusting nuts 14 at the front of both sides will allow the second roller 3 to move back and forth. Adjusting the movement of the second roller 3 will adjust the tension of belt 4. Once the required tension is achieved, tighten bolt 16 and retaining ring 17.

[0064] Based on the above embodiments, in some embodiments, such as Figures 1 to 4 As shown, the adjusting screw 13 extends along the length of the oblong hole.

[0065] Specifically, the axis of the adjusting screw 13 is completely aligned with the long axis of the oblong hole, ensuring that the displacement direction of the movable frame 12 driven by the adjusting nut 14 is perfectly consistent with the guide path defined by the oblong hole. This coaxial arrangement eliminates the lateral force component caused by the angle between the screw and the guide hole in traditional structures, significantly reducing frictional resistance and the risk of jamming during the movement of the movable frame 12. Simultaneously, the parallel relationship between the adjusting screw 13 and the oblong hole ensures that the tension transmission path always follows the extension direction of the belt 4, preventing belt 4 from deviating or experiencing uneven tension distribution due to skewing, further improving the accuracy and stability of belt 4 tensioning.

[0066] This application also provides a belt conveyor, such as... Figures 1 to 4 As shown, the belt conveyor includes: a first roller 2, a second roller 3, a belt 4, and a belt tensioning device 1; the belt 4 is sleeved on the first roller 2 and the second roller 3. The belt tensioning device 1 includes: a fixed frame 11, a movable frame 12, a limiting member, an adjusting screw 13, and an adjusting nut 14. The first roller 2 is connected to the fixed frame 11, and the second roller 3 is connected to the movable frame 12. The movable frame 12 has a slotted hole along the extension direction of the belt 4; one end of the limiting member is connected to the fixed frame 11, and the other end extends into the slotted hole; one end of the adjusting screw 13 is connected to the movable frame 12, and the other end is movably connected to the fixed frame 11; the adjusting nut 14 is threadedly connected to the adjusting screw 13 and connected to the fixed frame 11.

[0067] When adjusting the belt tensioning device 1, the adjusting nut 14 is rotated, causing it to rotate on the adjusting screw 13. The adjusting nut 14 acts on the fixed frame 11. Since the movable frame 12 is connected to the adjusting screw 13, the movable mechanism moves relative to the movable frame 12 under the interaction of the adjusting nut 14 and the adjusting screw 13. Under the limitation of the limiting member, the adjusting nut 14, in conjunction with the adjusting screw 13, drives the movable frame 12 to move along the length direction of the oblong hole, so that the movable frame 12 moves relative to the fixed frame 11 along the extension direction of the belt 4. At the same time, by adjusting the rotation direction and the rotation ring of the adjusting nut 14, the direction and distance of the displacement of the adjusting nut 14 along the adjusting screw 13 can be adjusted, thereby precisely adjusting the tension of the belt 4.

[0068] The belt conveyor provided by this utility model achieves tension by rotating the adjusting nut 14 on the adjusting screw 13. This transmission method is simple and intuitive to operate, requiring only the use of common tools to rotate the nut. Rotating the adjusting nut 14 allows for effortless and precise control of the movement of the movable frame 12, thereby achieving quantitative and fine adjustment of the belt tension 4. Moreover, after adjustment, due to the existence of thread friction, the adjusting nut 14 is not prone to automatically loosening or retracting on the adjusting screw 13, effectively ensuring that the set belt tension 4 can be maintained stably for a long time under equipment vibration or load changes, preventing the belt 4 from slipping or skipping teeth due to loosening, and reducing maintenance requirements.

[0069] In some embodiments, such as Figures 1 to 4 As shown, the belt 4 is looped around the first drum 2 and the second drum 3; the belt conveyor also includes: the first idler 5, the second idler 6 and the third idler 7.

[0070] In this embodiment, the first idler roller 5 is horizontally arranged directly below the horizontal bearing section of the belt 4 and rotatably supported on the fixed frame 11. It supports the belt 4 in the material transport section, keeping it flat and reducing sagging. The second idler roller 6 is symmetrically arranged on both sides of the horizontal bearing section of the belt 4, with at least one set on each side. It is installed at an angle of "V" or groove, typically 20°–35°. Its two ends are hinged to the fixed frame 11 through brackets, allowing it to oscillate slightly adaptively with the load on the belt 4. This increases the wrap angle between the belt 4 and the material, improving conveying capacity, and preventing material from falling off. The third idler roller 7 is arranged below the return section of the belt 4, with its axis perpendicular to the running direction of the belt 4. It is installed at the bottom of the frame through elastic suspension or fixed supports. It supports the unloaded return belt 4, preventing the belt 4 from shaking or rubbing against the frame, and reducing return resistance.

[0071] It should be noted that the first roller 2, the driven roller, only serves for redirection and tensioning, and does not directly output power. Its two ends are mounted on a fixed bracket via bearing seats 10. The second roller 3 is the driving roller. The belt conveyor also includes a drive unit 8, which is mounted on the movable frame 12 via a mounting plate 18. The drive end of the drive unit 8 is connected to the driving roller. The drive unit 8 is a motor or a geared motor. A motor is suitable for medium to high speeds and light to medium loads. A geared motor is suitable for low speeds, high torque, heavy loads, or frequent start-stop applications. The drive unit 8 is fixed to the outside of the movable frame 12 via a flange or base. Users can choose to use the drive unit 8 to drive the rotation of the second roller 3 as needed.

[0072] like Figures 1 to 4 As shown, the belt conveyor also includes a cleaner 9, which is mounted on the movable frame 12. The working end of the cleaner 9 is pressed against the contact surface of the belt 4 corresponding to the second roller 3.

[0073] Specifically, the cleaner 9 is fixedly mounted on the movable frame 12 by bolts 16 or quick clamps, and its working end (scraper or scraper) is elastically pressed against the outer surface of the belt 4 corresponding to the second roller 3 (drive roller).

[0074] As the drive roller rotates, dust, wet material, or adhering substances on the surface of belt 4 are scraped off by the cleaner 9 in real time, preventing material from falling off during the return trip, roller slippage, and belt 4 from running off-track. At the same time, since the cleaner 9 moves synchronously with the movable frame 12, the contact pressure between the cleaner 9 and belt 4 remains constant regardless of how the tensioning device is adjusted, ensuring a stable and reliable cleaning effect.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A belt tensioning device (1), characterized in that, A belt conveyor is provided, comprising a first roller (2), a second roller (3), and a belt (4), wherein the belt (4) is used to be fitted over the first roller (2) and the second roller (3); The belt tensioning device (1) includes: A fixed frame (11) is used to house the first roller (2); A movable frame (12) is used to house the second roller (3), and the movable frame (12) has a waist-shaped hole formed along the extension direction of the belt (4); The limiting member has one end connected to the fixed frame (11) and the other end extending into the waist-shaped hole; The adjusting screw (13) is connected at one end to the movable frame (12) and at the other end to the fixed frame (11); An adjusting nut (14) is threaded to the adjusting screw (13) and connected to the fixed frame (11) so that, as the adjusting nut (14) moves on the adjusting screw (13), it cooperates with the adjusting screw (13) to drive the movable frame (12) to move along the length direction of the waist-shaped hole, so that the movable frame (12) moves relative to the fixed frame (11) along the extension direction of the belt (4).

2. The belt tensioning device (1) according to claim 1, characterized in that, The movable frame (12) includes two opposing adjustable side plates (121), with the second roller (3) positioned between the two adjustable side plates (121). Each of the adjustable side plates (121) has at least one waist-shaped hole, and multiple limiting members are provided accordingly. One end of each limiting member is connected to the fixed frame (11), and the other end of each limiting member extends into the corresponding waist-shaped hole.

3. The belt tensioning device (1) according to claim 2, characterized in that, Two adjusting screws (13) and two adjusting nuts (14) are provided respectively; one end of each adjusting screw (13) is connected to the corresponding adjusting side plate (121), and the other end is movably connected to both ends of the fixed frame (11); two adjusting nuts (14) are threadedly connected to the corresponding adjusting screws (13).

4. The belt tensioning device (1) according to claim 2, characterized in that, An adjusting plate (111) is connected to the fixed frame (11), and a fixed plate (122) is connected to the adjusting side plate (121). One end of the adjusting screw (13) is fixedly connected to the adjusting side plate (121) through the fixing plate (122), and the other end of the adjusting screw (13) passes through the adjusting plate (111); the adjusting plate (111) is slidable on the adjusting screw (13) axially relative to the adjusting screw (13).

5. The belt tensioning device (1) according to claim 1, characterized in that, The limiting component includes: The T-shaped sleeve (15) is connected at one end to the fixed frame (11) and at the other end extends into the waist-shaped hole; Bolt (16) and retaining ring (17), the bolt (16) passing through the retaining ring (17) and threadedly connected to the T-sleeve (15), so that the retaining ring (17) is pressed against the outer wall of the waist-shaped hole.

6. The belt tensioning device (1) according to any one of claims 1-5, characterized in that, The adjusting screw (13) extends along the length of the waist-shaped hole.

7. A belt conveyor, characterized in that, include: The first roller (2), the second roller (3), the belt (4), and the belt tensioning device (1) as described in any one of claims 1-6; The belt (4) is fitted over the first roller (2) and the second roller (3). The first roller (2) is connected to the fixed frame (11), and the second roller (3) is connected to the movable frame (12).

8. The belt conveyor according to claim 7, characterized in that, The belt (4) is looped around the first roller (2) and the second roller (3) in a ring shape; The belt conveyor also includes: The first idler roller (5) is rotatably supported below the horizontal bearing section of the belt (4); The second idler roller (6) is rotatable and inclinedly arranged on both sides of the horizontal bearing section of the belt (4); The third idler roller (7) is rotatably supported below the return section of the belt (4).

9. The belt conveyor according to claim 7, characterized in that, The first roller (2) is a driven roller, and the second roller (3) is a driving roller; The belt conveyor also includes a drive device (8), the drive end of which is connected to the drive roller.

10. The belt conveyor according to claim 7, characterized in that, The belt conveyor also includes: The cleaner (9) is installed on the movable frame (12), and the working end of the cleaner (9) is pressed against the contact surface of the belt (4) corresponding to the second roller (3).

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