Tightening device of reversible belt conveyor capable of preventing bag stacking

Abstract

The invention relates to the technical field of belt conveyors, in particular to an anti-stacking reversible belt conveyor tensioning device which comprises two sets of assembly plates fixedly installed on one side of a conveyor large frame, two sets of guide rails are fixedly installed on the sides, away from the conveyor large frame, of the assembly plates, and a sliding block is slidably connected between the two sets of guide rails. First roller seats are arranged in the sliding blocks, tensioning rollers are arranged in the first roller seats of the two sets of assembling plates, fixing blocks are fixedly installed on the sides, away from the conveyor large frame, of the assembling plates and located above the sliding blocks, tensioning screws are arranged in the fixing blocks, and the lower ends of the tensioning screws are rotationally connected with the upper ends of the sliding blocks through bearing seats. A locking nut is arranged on the periphery of the tensioning screw; the tensioning screw is arranged above the sliding block, a traditional downward tensioning mode is changed into a downward pushing mode, the locking nut is matched for preventing loosening, and the problems that threads of a traditional device are prone to loosening, and a tensioning roller is inconvenient to maintain are solved.

Description

Technical Field

[0001] This invention relates to the field of belt conveyor technology, and more particularly to a tensioning device for anti-overlapping and reversible belt conveyors. Background Technology

[0002] Reversible belt conveyors are widely used in bulk material loading, unloading and transfer systems in chemical, mining, and port industries because they can achieve bidirectional material transport. To ensure that there is sufficient friction between the conveyor belt and the drive drum to overcome the load resistance and to limit the sag of the conveyor belt between the idler rollers, a tensioning device needs to be installed on the belt return section of the conveyor.

[0003] The tensioning device used in existing reversible belt conveyors typically includes a mounting frame, a tensioning roller, and a tensioning screw. The tensioning roller is fixed in place by a roller seat that can slide up and down along the mounting frame. The tensioning screw is used to adjust the position of the roller seat, thereby controlling the tension of the conveyor belt. In actual operation, the tensioning device needs to be fixedly installed on the outer perimeter of the conveyor frame, ensuring that the tensioning roller is in close contact with the return section of the conveyor belt. The up and down position of the tensioning roller is adjusted by rotating the tensioning screw, so that the conveyor belt is always maintained within the preset initial tension range, ensuring the continuous and stable operation of the conveying system.

[0004] However, traditional tensioning devices mostly use a "downward tensioning" adjustment method, which applies downward pulling force to the tensioning roller seat through the tensioning screw to achieve belt tension. In actual operation, this method is prone to loosening due to the continuous vibration generated by the conveyor, affecting the normal operation of the conveyor and even causing equipment failure. In addition, its tension adjustment range is small. When the tensioning roller is damaged due to long-term wear and fatigue, it cannot be quickly disassembled, maintained and replaced, increasing equipment maintenance costs and downtime. When reversible belt conveyors switch between bidirectional conveying, the tensioning part will become unstable due to the sudden change in belt tension at the moment the conveyor belt changes from forward to reverse operation. This can easily lead to belt buckling, commonly known in the industry as "stuffing". In severe cases, it can damage the conveyor belt, affecting the service life of the equipment and conveying safety. Summary of the Invention

[0005] To overcome the problems that traditional conveyor tensioning devices often use a "pull-down" method for tensioning screws, which involves pulling the tensioning roller seat downwards by the tensioning screw, the threads of the tensioning screw are prone to loosening due to vibration during actual operation. Furthermore, the tension adjustment range is small, and it is difficult to maintain and replace the tensioning roller after it is damaged.

[0006] The technical solution of the present invention is as follows: a tensioning device for an anti-overlapping, reversible belt conveyor, comprising two sets of assembly plates respectively fixedly installed on one side of the conveyor frame, two sets of guide rails fixedly installed on the side of the assembly plates away from the conveyor frame, a slider slidably connected between the two sets of guide rails, a first roller seat provided inside the slider, a tensioning roller provided inside the first roller seat of the two sets of assembly plates, a fixing block fixedly installed on the side of the assembly plates away from the conveyor frame, the fixing block being located above the slider, a tensioning screw provided inside the fixing block, the lower end of the tensioning screw being rotatably connected to the upper end of the slider through a bearing seat, a locking nut provided around the tensioning screw, and two sets of symmetrically arranged protective components provided around the slider.

[0007] Preferably, the assembly plate serves as the mounting base for the entire tensioning device, ensuring a stable connection between the device and the conveyor frame. The tensioning roller is mounted on the slider via the first roller seat. Its core function is to maintain close contact with the conveyor belt, transferring tension to it and ensuring sufficient friction between the conveyor belt and the drive roller. It also limits the conveyor belt sag. Two sets of guide rails provide stable vertical sliding guidance for the slider, ensuring stable linear lifting and lowering adjustment of the tensioning roller. The fixing block is used to fix the tensioning screw, providing a stable support point and ensuring stable force application. Rotating the tensioning screw drives the slider to slide up and down along the guide rails, thus adjusting the height of the tensioning roller. After adjustment, the tensioning screw is locked with a locking nut. Located above the slider, the traditional "pull down" adjustment mode can be changed to a "push down" mode. This load transfer effectively reduces the continuous vibration generated during conveyor operation, preventing the tensioning screw from loosening. It also facilitates replacement and maintenance of the tensioning roller after long-term wear.

[0008] Preferably, the surface of the tension roller is provided with a wear-resistant coating, and the outer periphery of the tension roller has a conical structure that gradually narrows from both ends to the center.

[0009] Preferably, both the tensioning screw and the locking nut use trapezoidal or sawtooth threads.

[0010] Preferably, the lower end of the tensioning screw is provided with a corrugated protective sleeve, the upper end of the corrugated protective sleeve is welded and fixed to the tensioning screw, and a magnetic ring is fixedly installed at the lower end of the corrugated protective sleeve.

[0011] Preferably, the protective component includes a mounting plate welded to the side of the slider away from the conveyor frame, a connecting seat fixedly mounted on one side of the mounting plate by fasteners, a rotating shaft rotatably connected inside the connecting seat, and a swing frame fixedly mounted on the periphery of the rotating shaft.

[0012] Preferably, a second roller seat is fixedly installed at the upper end of the swing frame by fasteners, and a steering roller is provided inside the second roller seat corresponding to the two sets of assembly plates.

[0013] Preferably, the two sets of steering idlers are at the same height and installed at a height higher than that of the tension roller, and the conveyor belt is staggered from above the steering idlers and below the tension roller.

[0014] Preferably, a torsion spring is provided between the swing frame and the connecting seat, and the elastic force of the torsion spring is greater than the sum of the weights of the swing frame, the second roller seat, and the steering roller.

[0015] Preferably, an emergency stop button is fixedly installed on one side of the mounting plate by fasteners, and the emergency stop button is communicatively connected to the control system of the conveyor.

[0016] Preferably, the emergency stop button is located below the connecting seat, and the lower end of the swing frame is integrally formed with a trigger rod corresponding to the emergency stop button, with the trigger rod having a rounded corner treatment on one end of the emergency stop button.

[0017] The beneficial effects of this invention are:

[0018] This invention changes the traditional "pull down" tension adjustment mode to a "push down" mode by placing the tension screw above the slider. This reduces the axial tension on the tension screw by dispersing the load, effectively offsetting the impact of continuous vibration during conveyor operation on the tension screw, and reducing the possibility of loosening the threads from the adjustment principle. Meanwhile, two sets of steering rollers, respectively arranged on both sides of the tension roller, form an interlaced belt threading path with the tension roller. In conjunction with the elastic force of the torsion spring, they are always in close contact with the conveyor belt, thereby adapting to the adjustment position to buffer the sudden change in conveyor belt tension, guiding the conveyor belt to smoothly transition during bidirectional conveying, and effectively reducing the "overlapping" problem of conveyor belt folding caused by sudden tension changes. In addition, the device is equipped with an emergency stop button and trigger rod that are linked to the swing frame. When abnormal conditions such as conveyor belt stacking or component jamming cause a sudden increase in tension and push the swing frame to swing excessively, the trigger rod will automatically touch the emergency stop button and send a stop signal to the conveyor control system to achieve automatic emergency stop of the fault without manual operation. This greatly improves the timeliness of fault response, prevents the fault from escalating further, effectively protects the conveyor belt and equipment components, and ensures the safe and stable operation of the conveying operation. Attached Figure Description

[0019] Figure 1 The diagram shown is a three-dimensional structural schematic of the assembly plate of the anti-stacking and reversible belt conveyor tensioning device of the present invention. Figure 2 The diagram shown is a three-dimensional structural diagram of the overall assembly of the anti-stacking and reversible belt conveyor tensioning device of the present invention. Figure 3 The diagram shown is a schematic representation of the overall assembly plan of the anti-stacking and reversible belt conveyor tensioning device of the present invention. Figure 4 The diagram shown is a three-dimensional structural schematic of the rear assembly plate of the slider mounting protection component of the anti-stacking and reversible belt conveyor tensioning device of the present invention. Figure 5 The diagram shown is a three-dimensional structural schematic of the slider and protective components of the anti-stacking, reversible belt conveyor tensioning device of the present invention. Figure 6 The diagram shown is a partial plan view of the slider and protective components of the anti-stacking and reversible belt conveyor tensioning device of the present invention. Explanation of reference numerals in the attached drawings: 1. Assembly plate; 101. Guide rail; 102. Slider; 103. First roller seat; 104. Fixing block; 2. Tensioning screw; 201. Locking nut; 202. Corrugated protective sleeve; 203. Magnetic ring; 3. Tensioning roller; 4. Mounting plate; 401. Connecting seat; 402. Rotating shaft; 403. Swing frame; 404. Torsion spring; 405. Second roller seat; 406. Steering roller; 407. Emergency stop button; 408. Trigger lever. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Example 1; This application can effectively solve the problem that the tensioning screw 2 in the traditional conveyor tensioning device mostly adopts the "downward tightening" method, that is, by pulling the tensioning roller 3 downward through the tensioning screw 2, the threads of the tensioning screw 2 are easily loosened due to vibration in actual operation, and the tension adjustment range is small. After the tensioning roller 3 is damaged, it is difficult to maintain and replace the tensioning roller 3.

[0022] Please see Figure 1 and Figure 2 This invention provides an embodiment of a tensioning device for an anti-overlapping, reversible belt conveyor, comprising two sets of assembly plates 1 respectively fixedly installed on one side of the conveyor frame. Two sets of guide rails 101 are fixedly installed on the side of the assembly plate 1 away from the conveyor frame. A slider 102 is slidably connected between the two sets of guide rails 101. A first roller seat 103 is provided inside the slider 102. A tensioning roller 3 is provided inside the first roller seat 103 of the two sets of assembly plates 1. A fixing block 104 is fixedly installed on the side of the assembly plate 1 away from the conveyor frame. The fixing block 104 is located above the slider 102. A tensioning screw 2 is provided inside the fixing block 104. The lower end of the tensioning screw 2 is rotatably connected to the upper end of the slider 102 through a bearing seat. A locking nut 201 is provided around the tensioning screw 2. Two sets of symmetrically arranged protective components are provided around the slider 102.

[0023] The assembly plate 1 serves as the mounting base for the entire tensioning device, ensuring a stable connection between the device and the conveyor frame. The tensioning roller 3 is mounted on the slider 102 via the first roller seat 103. Its core function is to maintain close contact with the conveyor belt, transferring tension to it and ensuring sufficient friction between the conveyor belt and the drive roller. It also limits the sag of the conveyor belt. Two sets of guide rails 101 provide stable vertical sliding guidance for the slider 102, ensuring that the slider 102 drives the tensioning roller 3 to perform stable linear lifting and lowering adjustments. The fixing block 104 is used to fix the tensioning screw 2, providing a stable support point for it and ensuring that the tensioning screw 2 can exert force stably. By rotating the tensioning screw 2, the slider 102 is driven to slide up and down along the guide rail 101, thereby adjusting the height of the tensioning roller 3. After adjustment, the tensioning screw 2 is locked with a locking nut 201.

[0024] It should be noted that the traditional "pull down" adjustment mode can be changed to a "push down" adjustment mode. By transferring the load, the axial tension borne by the tension screw 2 can be effectively dispersed, thereby reducing the impact of continuous vibration generated during the operation of the conveyor on the tension screw 2 and significantly reducing the probability of loosening of the tension screw 2 threads. At the same time, this installation layout allows the slider 102 to slide upward along the guide rail 101 without disassembling the tension screw 2, so that the tension roller 3 can be separated from the conveyor belt. This facilitates the disassembly, maintenance and replacement of the tension roller 3 after long-term wear and tear, solving the technical problem of inconvenient maintenance and replacement of the tension roller 3 in traditional devices.

[0025] Please see Figure 3 In this embodiment, the surface of the tension roller 3 is provided with a wear-resistant coating, and the periphery of the tension roller 3 has a conical structure that gradually narrows from both ends to the center.

[0026] Among them, the wear-resistant coating on the surface of the tension roller 3 can significantly improve the hardness and wear resistance of the surface of the tension roller 3, reduce the friction loss between the tension roller 3 and the conveyor belt, and extend the service life of the tension roller 3. The conical structure design can automatically center and guide the conveyor belt when the tension roller 3 contacts the conveyor belt, preventing the conveyor belt from running off-center during operation. In addition, the conical structure can make the tension force more evenly transmitted to the width direction of the conveyor belt, avoiding damage caused by excessive local stress on the conveyor belt. At the same time, during reversible conveying switching, it can reduce the relative sliding between the conveyor belt and the tension roller 3, further preventing the "overlapping" phenomenon of the conveyor belt.

[0027] Example 2; Based on Example 1, further optimizations have been made regarding the prevention of loosening and long-term stable operation of the tensioning screw 2. Please refer to [link / reference needed]. Figure 3 and Figure 4 In this embodiment, the threads of both the tensioning screw 2 and the locking nut 201 are trapezoidal threads or sawtooth threads.

[0028] Among them, trapezoidal or sawtooth threads have stronger load-bearing capacity and wear resistance than ordinary triangular threads. They can effectively withstand the axial force when the tension screw 2 is adjusted and the vibration and impact force generated during the operation of the conveyor. They can prevent the threads from deforming or stripping due to excessive force or long-term vibration. They also have better self-locking performance. When used with the locking nut 201, they can further improve the locking stability of the tension screw 2, prevent the threads from loosening, ensure that the position of the tension roller 3 remains stable, and thus maintain the constant tension of the conveyor belt.

[0029] Furthermore, a corrugated protective sleeve 202 is provided at the lower end of the tensioning screw 2, the upper end of the corrugated protective sleeve 202 is welded and fixed to the tensioning screw 2, and a magnetic ring 203 is fixedly installed at the lower end of the corrugated protective sleeve 202.

[0030] Among them, the corrugated protective sleeve 202 can form a movable physical barrier around the tensioning screw 2. Without affecting the lifting and adjusting operation of the tensioning screw 2, it can effectively prevent dust, impurities, oil and other pollutants in harsh working environments such as chemical plants and mines from entering the threads of the tensioning screw 2 and the connection with the slider 102, ensuring the smooth rotation of the tensioning screw 2 and preventing parts from rusting and jamming. The magnetic ring 203 at the lower end can be stably adsorbed on the surface of the locking nut 201, ensuring that the corrugated protective sleeve 202 is always in the correct protective position, providing continuous and reliable protection for the tensioning screw 2. It should be noted that when adjusting the tension screw 2, simply pull the magnet ring 203 off the locking nut 201 to rotate and adjust the tension screw 2. After adjustment, the magnet ring 203 can be reattached to the locking nut 201. The operation is convenient and does not affect the normal operation of the device.

[0031] Example 3; Based on Example 1, optimizations were made to improve the tensioning device's proactive prevention and adaptation to the "overlapping" phenomenon when the running direction changes. Please refer to [link to example]. Figure 3 and Figure 5 In this embodiment, the protective component includes a mounting plate 4 welded to the side of the slider 102 away from the conveyor frame. A connecting seat 401 is fixedly mounted on one side of the mounting plate 4 by fasteners. A rotating shaft 402 is rotatably connected inside the connecting seat 401. A swing frame 403 is fixedly mounted on the periphery of the rotating shaft 402.

[0032] Furthermore, a second roller seat 405 is fixedly installed on the upper end of the swing frame 403 by fasteners, and a steering roller 406 is provided inside the second roller seat 405 corresponding to the two sets of assembly plates 1.

[0033] Furthermore, the two sets of steering rollers 406 are at the same height and are installed at a height higher than that of the tension roller 3. The conveyor belt is staggered between the top of the steering rollers 406 and the bottom of the tension roller 3.

[0034] The mounting plate 4 is fixedly connected to the slider 102 by welding, ensuring a strong and stable connection. This provides a stable mounting base for other components of the protection assembly, allowing the protection assembly to rise and fall synchronously with the slider 102 and maintain a suitable relative position with the tension roller 3. The connecting seat 401 is fixed to the mounting plate 4 by fasteners, facilitating disassembly and maintenance. It can be quickly replaced if the connecting seat 401 or other components are damaged, reducing maintenance difficulty. The rotating shaft 402 is rotatably connected to the connecting seat 401, providing flexible rotational support for the swing frame 403, enabling the swing frame 403 to rotate freely. 03 can swing around the rotating shaft 402 at a certain angle. The steering idler 406 is installed on the swing frame 403 through the second roller seat 405 to turn and guide the conveyor belt. It works with the tension roller 3 to achieve reasonable conveyor belt insertion, so that the conveyor belt can stably fit the tension roller 3 and ensure effective transmission of tension. When switching between reversible conveying, it can guide the conveyor belt to transition smoothly and avoid the conveyor belt from deflection and folding due to sudden tension changes caused by changes in direction. It works in synergy with the tension roller 3 to improve the stability of the conveyor belt operation and ensure the smooth operation of bidirectional conveying.

[0035] Please see Figure 5 and Figure 6 In this embodiment, a torsion spring 404 is provided between the swing frame 403 and the connecting seat 401. The elastic force of the torsion spring 404 is greater than the sum of the weights of the swing frame 403, the second roller seat 405 and the steering roller 406.

[0036] Furthermore, an emergency stop button 407 is fixedly installed on one side of the mounting plate 4 by fasteners. The emergency stop button 407 is communicatively connected to the control system of the conveyor.

[0037] Furthermore, the emergency stop button 407 is located below the connecting seat 401, and the lower end of the swing frame 403 is integrally formed with a trigger rod 408 corresponding to the emergency stop button 407. The trigger rod 408 rounds one end of the emergency stop button 407.

[0038] The torsion spring 404 is disposed between the swing frame 403 and the connecting seat 401, and can apply a continuous elastic force to the swing frame 403. Since the elastic force of the torsion spring 404 is greater than the sum of the weights of the swing frame 403, the second roller seat 405, and the steering roller 406, it can ensure that the swing frame 403 always maintains an upward swinging trend, thereby driving the steering roller 406 to always be in close contact with the conveyor belt. Regardless of whether the conveyor belt is running in the forward or reverse direction, the position of the steering roller 406 can be adaptively adjusted by the elastic force of the torsion spring 404, so that the steering roller 406 always fits against the surface of the conveyor belt, avoiding damage caused by improper use. The guide roller 406 detaches from the conveyor belt, causing guide failure, conveyor belt deviation, or bulging. At the same time, the elasticity of the torsion spring 404 can buffer the vibration and tension fluctuations generated during the operation of the conveyor belt, reduce the impact of vibration on components such as the guide roller 406 and the swing frame 403, and extend the service life of the components. The emergency stop button 407 is connected to the conveyor control system. When the device experiences sudden failures such as conveyor belt bulging, component jamming, or abnormal tension, the emergency stop button 407 can be operated to quickly send a stop signal to the conveyor control system, controlling the conveyor to stop immediately and preventing the failure from escalating further.

[0039] It should be noted that the trigger rod 408, integrally formed at the lower end of the swing frame 403, can swing synchronously with the swing frame 403. When the device malfunctions, such as when the conveyor belt overlaps and causes a sudden increase in tension, pushing the steering roller 406 to drive the swing frame 403 to swing excessively, the trigger rod 408 will swing accordingly and touch the emergency stop button 407, realizing the automatic shutdown of the conveyor without manual operation. This further improves the timeliness and reliability of fault response and enhances equipment and operational safety. In addition, the trigger rod 408 rounds one end of the emergency stop button 407 to prevent the trigger rod 408 from scratching or damaging the button surface of the emergency stop button 407 when it touches it, thus extending the service life of the emergency stop button 407. At the same time, it ensures smooth triggering action and avoids jamming caused by the sharp end of the trigger rod 408, ensuring the stable implementation of the emergency stop function.

[0040] Example 4; Based on the above embodiment 1, the wear-resistant protection structure of the tension roller is optimized. The conical surface of the tension roller 3 is provided with a spiral guide groove with a depth of 1-3mm and a pitch of 5-8cm. The wear-resistant coating is a ceramic particle reinforced polyurethane coating with a thickness of 0.8-1.2mm.

[0041] Among them, the ceramic particle reinforced polyurethane coating combines the high wear resistance of ceramics with the elastic cushioning properties of polyurethane. Compared with the traditional single wear-resistant coating, it reduces the friction loss between the tension roller 3 and the conveyor belt by more than 40%, and significantly extends the service life of the tension roller 3. The spiral guide groove can discharge dust and fine materials adhering to the conveyor belt along the spiral direction during the operation of the conveyor, avoiding the accumulation of dust and materials between the tension roller 3 and the conveyor belt to form hard abrasive particles, further reducing the contact wear between the two. At the same time, the spiral structure of the groove can generate a slight guiding and corrective force on the conveyor belt when the conveyor belt is running in both directions. Combined with the conical structure of the tension roller 3, it can doubly prevent the conveyor belt from running off-track and improve the stability of operation.

[0042] Example 5; Based on the above embodiment 3, the elastic adjustment structure of the torsion spring 404 of the protection component is optimized. In this embodiment, an adjustment knob for the torsion spring 404 is provided on the outside of the connecting seat 401. The adjustment knob is fixedly connected to the end of the rotating shaft 402. One end of the torsion spring 404 is engaged in the slot of the rotating shaft 402, and the other end is engaged in the adjustment groove of the connecting seat 401. At least 6 slots are evenly opened along the circumference of the connecting seat 401.

[0043] By rotating the adjustment knob, the rotating shaft 402 can be rotated, changing the engagement position of the torsion spring 404, thereby achieving multi-level adjustment of the spring force of the torsion spring 404 to adapt to the tension requirements of conveyor belts of different widths and thicknesses and different conveyed materials. When conveying heavy bulk materials, adjust the torsion spring 404 to the high elasticity setting to ensure that the steering roller 406 fits tightly with the conveyor belt and effectively buffers sudden tension changes; when conveying light bulk materials, adjust it to the low elasticity setting to avoid excessive pressure on the conveyor belt by the steering roller 406, which would cause additional wear.

[0044] Meanwhile, the connecting seat 401 is engraved with spring position markings that correspond one by one with the adjustment slots. Operators can quickly and accurately adjust according to the actual working conditions without disassembling parts, thus improving the adaptability and ease of operation of the device. It should be noted that the 404 torsion spring is made of stainless steel and has excellent corrosion resistance and fatigue resistance. It can be used for a long time without failure in harsh environments such as chemical plants and mines.

[0045] Example 6; Based on Example 1, the intelligent monitoring and protection structure of the device is optimized. A tension sensor and a vibration sensor are added to the mounting plate 4. The tension sensor is attached to the second roller seat 405 of the steering roller 406, and the vibration sensor is fixed to the inner side of the mounting plate 1. Both the tension sensor and the vibration sensor are wirelessly connected to the control system of the conveyor. An audible and visual alarm is installed on the top of the mounting plate 1 and is electrically connected to the control system.

[0046] The tension sensor monitors the tension value of the conveyor belt on the steering idler roller 406 in real time, and the vibration sensor monitors the vibration frequency and amplitude of the assembly plate in real time. When the tension value exceeds the preset threshold or the vibration value exceeds the normal range, the control system will immediately trigger dual protection: first, the sound and light alarm will be controlled to emit a red and blue light flashing sound and light alarm to remind the on-site operators to troubleshoot the fault in time; second, if the fault is not resolved within 5 seconds after the trigger, the control system will automatically send a stop signal to drive the conveyor to stop urgently.

[0047] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A tensioning device for an anti-overlapping, reversible belt conveyor, characterized in that: It includes two sets of assembly plates (1) fixedly installed on one side of the conveyor frame. Two sets of guide rails (101) are fixedly installed on the side of the assembly plate (1) away from the conveyor frame. A slider (102) is slidably connected between the two sets of guide rails (101). A first roller seat (103) is provided inside the slider (102). A tension roller (3) is provided inside the first roller seat (103) of the two sets of assembly plates (1). A fixing block (104) is fixedly installed on the side of the assembly plate (1) away from the conveyor frame. The fixing block (104) is located above the slider (102). A tension screw (2) is provided inside the fixing block (104). The lower end of the tension screw (2) is rotatably connected to the upper end of the slider (102) through a bearing seat. A locking nut (201) is provided around the tension screw (2). Two sets of symmetrically arranged protective components are provided around the slider (102).

2. The anti-overlapping, reversible belt conveyor tensioning device according to claim 1, characterized in that: The surface of the tension roller (3) is provided with a wear-resistant coating, and the outer periphery of the tension roller (3) has a conical structure that gradually narrows from both ends to the center.

3. The anti-overlapping, reversible belt conveyor tensioning device according to claim 1, characterized in that: The threads of the tensioning screw (2) and the locking nut (201) are both trapezoidal threads or sawtooth threads.

4. The anti-overlapping, reversible belt conveyor tensioning device according to claim 1, characterized in that: The lower end of the tensioning screw (2) is provided with a corrugated protective sleeve (202), the upper end of the corrugated protective sleeve (202) is welded and fixed to the tensioning screw (2), and a magnetic ring (203) is fixedly installed at the lower end of the corrugated protective sleeve (202).

5. The anti-overlapping, reversible belt conveyor tensioning device according to claim 1, characterized in that: The protective component includes a mounting plate (4) welded to the side of the slider (102) away from the conveyor frame. A connecting seat (401) is fixedly mounted on one side of the mounting plate (4) by fasteners. A rotating shaft (402) is rotatably connected inside the connecting seat (401). A swing frame (403) is fixedly mounted on the periphery of the rotating shaft (402).

6. The anti-overlapping, reversible belt conveyor tensioning device according to claim 5, characterized in that: The upper end of the swing frame (403) is fixedly installed with a second roller seat (405) by fasteners, and the two sets of assembly plates (1) are equipped with steering rollers (406) inside the second roller seat (405).

7. The anti-overlapping, reversible belt conveyor tensioning device according to claim 6, characterized in that: The two sets of steering rollers (406) are at the same height and are installed at a height higher than that of the tension roller (3). The conveyor belt is staggered from above the steering rollers (406) and below the tension roller (3).

8. The anti-overlapping, reversible belt conveyor tensioning device according to claim 5, characterized in that: A torsion spring (404) is provided between the swing frame (403) and the connecting seat (401). The elastic force of the torsion spring (404) is greater than the sum of the weights of the swing frame (403), the second roller seat (405), and the steering roller (406).

9. The anti-overlapping, reversible belt conveyor tensioning device according to claim 5, characterized in that: An emergency stop button (407) is fixedly installed on one side of the mounting plate (4) by fasteners. The emergency stop button (407) is connected to the control system of the conveyor.

10. The anti-overlapping, reversible belt conveyor tensioning device according to claim 9, characterized in that: The emergency stop button (407) is located below the connecting seat (401). The lower end of the swing frame (403) is integrally formed with a trigger rod (408) corresponding to the emergency stop button (407). The trigger rod (408) rounds one end of the emergency stop button (407).

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