Anti-falling tensioning device for heavy hammer of belt conveyor

Abstract

The utility model discloses an anti-falling tensioning device for a heavy hammer of a belt conveyor, which is mounted on the belt conveyor, a heavy hammer box of the belt conveyor can move up and down along a vertical guide rod, a first turnabout drum and a second turnabout drum are mounted on an upper mounting bracket, a third turnabout drum is mounted on the heavy hammer box, and a second turnabout drum is mounted on the third turnabout drum. The belt is wound on the first turnabout drum, the second turnabout drum and the third turnabout drum, a driving device of the anti-falling tensioning device, the pull rod and the winding drum assembly are installed on the upper installation support, a spring is arranged between the pull rod and the upper installation support, the steel wire rope is wound on the guide pulley, one end of the steel wire rope is fixedly connected with the pull rod, and the other end of the steel wire rope is fixedly connected with a winding drum of the winding drum assembly. The driving device drives the winding drum of the winding drum assembly to rotate to wind and unwind the steel wire rope, and then the steel wire rope pulls the heavy hammer box to move up and down along the vertical guide rod. The length of the steel wire rope is automatically extended or retracted along with the movement of the heavy punch box, so that automatic compensation is realized, the steel wire rope is prevented from damaging the belt and the heavy punch box is prevented from suddenly falling, and the belt conveyor is convenient to overhaul.

Description

Technical Field

[0001] The utility model relates to the technical field of mining auxiliary equipment, in particular to a belt conveyor weight anti-falling tensioning device. Background Art

[0002] Vertical weight tensioners are a cost-effective and efficient tensioning method for belt conveyors, widely used across various industries. However, due to location requirements, vertical weight tensioners are sometimes located high above the conveyor belt. Due to ageing, joint failure, or wear, the belt may weaken and break. In this case, the weight box of the vertical weight tensioner could fall from the height, causing a significant impact on the ground or platform below, potentially resulting in personal injury. Therefore, the safety of vertical weight tensioners is paramount.

[0003] Most existing anti-fall devices are to set an anti-fall wire rope between the weight tensioning device and the upper crossbeam. As the length of the conveyor belt increases over time, the weight box moves downward in the vertical direction. In order to solve this problem, the length of the anti-fall wire rope is generally lengthened. The disadvantages of this anti-fall measure are: (1) In the early stage, the length of the wire rope is too long and it is easy for it to come into contact with the belt, which not only damages the belt but also easily gets entangled in the roller and causes an accident. (2) When the conveyor belt breaks, the falling weight box has a great impact on the fixing device on the anti-fall wire rope. (3) If the length of the wire rope is not enough, it will affect the tensioning force of the weight tensioning device or the tensioning will fail in the later stage.

[0004] Furthermore, when overhauling a belt conveyor, the entire weight box must be lifted to reduce belt tension and loosen the belt. For example, when replacing idlers, loosening the belt allows for easier removal from underneath the belt for replacement. Existing methods often involve installing an electric hoist or mobile crane above the tensioning device. The operator visually assesses the height to lift or lower the weight box, resulting in significant height errors. Improper operation can also cause the weight box to collide with overhead equipment or the foundation. Using a mobile crane to lift the weight box is particularly inconvenient in limited factory space. Utility Model Content

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a belt conveyor weight anti-fall tensioning device, which can effectively prevent the weight box from falling suddenly, prevent the wire rope from damaging the belt, and make the belt conveyor easy to maintain.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The belt conveyor weight anti-fall tensioning device is installed on the belt conveyor. The belt conveyor includes a weight box, an upper mounting bracket and a vertical guide rod fixedly connected to the upper mounting bracket. The weight box can move up and down along the vertical guide rod. The upper mounting bracket is equipped with a first bend roller and a second bend roller. The weight box is equipped with a third bend roller. The belt is wound around the first bend roller, the second bend roller and the third bend roller. The characteristics are:

[0008] The belt conveyor weight anti-fall tensioning device includes a driving device, a drum assembly, a steel wire rope, a pull rod and a guide pulley, wherein the guide pulley is mounted on the weight box, the driving device, the pull rod and the drum assembly are mounted on the upper mounting bracket, and a spring is provided between the pull rod and the upper mounting bracket.

[0009] The steel wire rope is wound around the guide pulley and one end is fixedly connected to the pull rod, and the other end is fixedly connected to the drum of the drum assembly. The driving device drives the drum of the drum assembly to rotate to retract and release the steel wire rope, and then the steel wire rope pulls the weight box to move up and down along the vertical guide rod.

[0010] Preferably, the reel assembly includes the reel and a reel support, and reel shafts are fixed to both ends of the reel, and the reel shafts are rotatably mounted on the reel support.

[0011] Preferably, the driving device includes a permanent magnet synchronous variable frequency speed regulating motor and a worm gear transmission device, the output shaft of the permanent magnet synchronous variable frequency speed regulating motor is fixedly connected to the worm, the worm wheel is fixed on the worm wheel shaft, and the worm wheel shaft is connected to the drum shaft through a coupling.

[0012] Preferably, the belt conveyor weight anti-falling tensioning device includes a brake for braking the worm gear shaft.

[0013] Preferably: the brake includes a pusher, a spring pull rod, a connecting lever, two brake arms, a connecting rod and a brake shoe, the brake shoe is hinged at the middle of the brake arm, the lower end of the brake arm is hinged to the upper mounting bracket, the two brake arms are respectively a first brake arm and a second brake arm, the upper end of the first brake arm is hinged to one end of the connecting rod, one end of the connecting lever is respectively hinged to the other end of the connecting rod and the upper end of the second brake arm, the other end of the connecting lever is hinged to the push rod of the pusher, one end of the spring pull rod is hinged to the upper mounting bracket, and the other end is hinged to the middle of the connecting lever, a brake wheel corresponding to the brake shoe is fixed on the worm gear shaft and / or the reel shaft, and when in the braking state, the two brake shoes hold the brake wheel tightly.

[0014] Preferably, the belt conveyor weight anti-falling tensioning device includes an electric control box, and the electric control box is electrically connected to the permanent magnet synchronous variable frequency speed regulating motor.

[0015] Preferably: a first pressure sensor is provided between the pull rod and the upper mounting bracket, and a second pressure sensor and a third pressure sensor are provided on the upper mounting bracket, the second pressure sensor detects the tension of the belt wound around the first redirecting roller, and the third pressure sensor detects the tension of the belt wound around the second redirecting roller, and the electrical control box is electrically connected to the first pressure sensor, the second pressure sensor and the third pressure sensor respectively.

[0016] Preferably: a first bearing seat for mounting the first redirecting roller and a second bearing seat for mounting the second redirecting roller are fixed on the upper mounting bracket, the second pressure sensor is installed between the first bearing seat and the upper mounting bracket, and the third pressure sensor is installed between the second bearing seat and the upper mounting bracket.

[0017] Preferably, an upper travel limit switch and a lower travel limit switch for limiting the travel of the weight box are installed on the vertical guide rod, and the electric control box is electrically connected to the upper travel limit switch and the lower travel limit switch.

[0018] Preferably, the worm is a self-locking cylindrical worm with a lead angle less than 30°30′.

[0019] After adopting the above technical solution, the beneficial effects of the utility model are:

[0020] The utility model relates to a belt conveyor weight anti-fall tensioning device. A wire rope is wound around a guide pulley, one end of which is fixedly connected to a pull rod and the other end to a drum of a drum assembly. A drive device drives the drum of the drum assembly to rotate and retract the wire rope, thereby pulling the weight box up and down along the vertical guide rod. The length of the wire rope automatically extends or retracts as the weight box moves, achieving automatic compensation, keeping the wire rope in a constant tensioned state and effectively preventing damage to the belt caused by excessive wire rope contact. Furthermore, because a spring is provided between the pull rod, to which one end of the wire rope is fixedly connected, and the upper mounting bracket, if the belt breaks, the wire rope can quickly pull on the weight box, preventing it from falling and maintaining its height. The spring at the fixed end of the wire rope is compressed to absorb impact energy, effectively reducing the inertial impact of the weight box falling and significantly improving the safety of the vertical weight tensioning device.

[0021] The electric control box cooperates with the first sensor to enable the driving device to drive the drum of the drum assembly to rotate to automatically reel in and out the wire rope, and to keep the wire rope in a tensioned state in the anti-fall mode, thereby realizing automatic compensation.

[0022] The electronic control box, in conjunction with the second and third sensors, can promptly detect belt breakage and failure. If the control box determines the conveyor belt is broken or failed, the brake shoe closes, applying the brake force to the drum. If the belt breaks, the brake shoe is in the open position, and the control box de-energizes the pusher. This causes the brake shoe, activated by the spring pull rod, to quickly reset. The shoe grips the brake wheel, forcing the brake shoe closed and shutting down the permanent magnet synchronous variable frequency speed motor.

[0023] During equipment maintenance, this belt conveyor weight anti-fall tensioning device automatically raises the weight box to a set height, loosening the belt and facilitating component repair or replacement. After maintenance, the weight box automatically returns to its original height. This simplifies operation compared to manual lifting and lowering based on visual inspection, effectively preventing collisions between the weight box and overhead equipment or foundations caused by excessive manual lifting. Its compact structure eliminates the need for extensive lifting space, making it easy to deploy.

[0024] Furthermore, a lower limit switch is installed on the vertical guide rod to limit the weight box's travel, preventing accidents caused by excessive belt extension and tension failure. Furthermore, if the electrical control box of the belt conveyor weight anti-fall tensioning device is connected to the conveyor's DSC system, remote control can be achieved, making operation even simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of the utility model's belt conveyor weight anti-fall tensioning device (belt omitted);

[0026] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model belt conveyor weight anti-falling tensioning device from the first angle;

[0027] Figure 3 This is a schematic diagram of the three-dimensional structure of the utility model belt conveyor weight anti-falling tensioning device from a second angle;

[0028] Figure 4 This is a three-dimensional structural diagram of the utility model belt conveyor weight anti-falling tensioning device with the first and second redirecting rollers hidden;

[0029] Figure 5 yes Figure 4 Schematic diagram of the enlarged structure at A in the middle;

[0030] In the figure: 101, weight box; 1011, guide pulley; 102, upper mounting bracket; 1021, first bearing seat; 1022, second bearing seat; 103, vertical guide rod; 1031, upper travel limit switch; 1032, lower travel limit switch; 104, first redirecting roller; 105, second redirecting roller; 106, spring; 107, third redirecting roller; 2, drive device; 201, permanent magnet synchronous variable frequency speed regulating motor; 202, worm; 203, worm gear; 204, worm gear shaft ;2041, brake wheel; 3, drum assembly; 301, drum; 3010, drum shaft; 302, drum bracket; 4, wire rope; 5, brake; 501, pusher; 5011, push rod; 503, connecting lever; 504, connecting rod; 505, brake shoe; 506, first brake arm; 507, second brake arm; 6, electrical control box; 7, first pressure sensor; 8, second pressure sensor; 9, third pressure sensor; 10, belt; 11, pull rod; 1102, spring pull rod. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the claims attached to the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0033] In addition, although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0034] like Figures 1 to 3As shown, the belt conveyor weight anti-fall tensioning device is installed on the belt conveyor. The belt conveyor includes a weight box 101, an upper mounting bracket 102 and a vertical guide rod 103 fixedly connected to the upper mounting bracket 102. The weight box 101 can move up and down along the vertical guide rod 103. The upper mounting bracket 102 is equipped with a first bend roller 104 and a second bend roller 105. The weight box 101 is equipped with a third bend roller. The belt 10 is wound around the first bend roller 104, the second bend roller 105 and the third bend roller 107.

[0035] The belt conveyor weight anti-fall tensioning device includes a driving device 2, a drum assembly 3, a wire rope 4, a pull rod 11 and a guide pulley 1011. In this embodiment, two guide pulleys 1011 are preferably provided. The two guide pulleys 1011 are installed on the weight box 101. The driving device 2, the pull rod and the drum assembly 3 are installed on the upper mounting bracket 102. A spring 106 is provided between the pull rod 11 and the upper mounting bracket 102.

[0036] The wire rope 4 is wound around two guide pulleys 1011 and one end is fixedly connected to the pull rod 11, and the other end is fixedly connected to the drum 301 of the drum assembly 3. The driving device 2 drives the drum 301 of the drum assembly 3 to rotate to retract and release the wire rope 4, and then the wire rope 4 pulls the hammer box 101 to move up and down along the vertical guide rod 103.

[0037] The reel assembly 3 includes a reel 301 and a reel support 302. A reel shaft 3010 is fixed at each end of the reel 301 and rotatably mounted on the reel support 302. The drive device 2 includes a permanent magnet synchronous variable-frequency speed-regulating motor 201 and a worm gear transmission. The worm gear transmission includes a worm wheel 203 and a worm 202. The output shaft of the permanent magnet synchronous variable-frequency speed-regulating motor 201 is fixedly connected to the worm 202. The worm wheel 203 is fixed to the worm gear shaft 204, and the worm gear shaft 204 is connected to the reel shaft 3010 via a coupling. The belt conveyor weight anti-fall tensioning device includes a brake 5 for braking the worm gear shaft 204. The worm 202 is preferably a self-locking cylindrical worm with a lead angle of less than 30°30′.

[0038] like Figure 4 He Ru Figure 5As shown, the brake 5 includes a pusher 501, a spring pull rod 1102, a connecting lever 503, two brake arms, a connecting rod 504 and a brake shoe 505. The brake shoe 505 is hinged at the middle of the brake arm. The lower end of the brake arm is hinged to the upper mounting bracket 102. The two brake arms are respectively a first brake arm 506 and a second brake arm 507. The upper end of the first brake arm 506 is hinged to one end of the connecting rod 504. One end of the connecting lever 503 is hinged to the other end of the connecting rod 504 and the second brake arm 507. The upper end of the connecting lever 503 is hinged, the other end of the connecting lever 503 is hinged to the push rod 5011 of the pusher 501, one end of the spring pull rod 1102 is hinged to the upper mounting bracket 102, and the other end is hinged to the middle of the connecting lever 503. Depending on the specific situation, a brake wheel 2041 corresponding to the brake shoe 505 can be fixed on the worm shaft 204, or a brake wheel 2041 corresponding to the brake shoe 505 can be fixed on the reel shaft 3010. When in the braking state, the two brake shoes 505 hold the brake wheel 2041 tightly.

[0039] Of course, in some embodiments, such as Figure 5 As shown, the worm gear shaft 204 and the reel shaft 3010 can also be fixedly connected through a brake wheel type coupling. The brake 5 is a normally closed type, and the brake shoe 505 acts on the brake wheel type coupling (or brake wheel) to prevent the reel 301 from rotating under the influence of external forces when it is not in operation.

[0040] like Figure 1 and Figure 2 As shown, before power is applied to pusher 501, the brake is in the braking state (normally closed) due to the action of spring pull rod 1102. After power is applied, pusher 501 operates, raising push rod 5011 of pusher 501. This, through a lever system, compresses brake spring pull rod 1102, opening brake shoe 505 (this is the released state). After power is removed, brake shoe 505 quickly returns to its original position due to the action of brake spring pull rod 1102, and engages the brake wheel (this is the engaged state).

[0041] The belt conveyor weight anti-falling tensioning device comprises an electric control box 6 , which is electrically connected to a permanent magnet synchronous variable frequency speed regulating motor 201 .

[0042] like Figure 2 As shown, a first pressure sensor 7 is provided between the pull rod 11 and the upper mounting bracket 102, and a second pressure sensor 8 and a third pressure sensor 9 are provided on the upper mounting bracket 102. The second pressure sensor 8 detects the tension of the belt 10 wound around the first redirecting roller 104, and the third pressure sensor 9 detects the tension of the belt 10 wound around the second redirecting roller 105. The electrical control box 6 is electrically connected to the first pressure sensor 7, the second pressure sensor 8 and the third pressure sensor 9 respectively.

[0043] A first bearing seat 1021 for mounting the first redirecting roller 104 and a second bearing seat 1022 for mounting the second redirecting roller 105 are fixed on the upper mounting bracket 102. Preferably, two second pressure sensors 8 are provided, the second pressure sensors 8 are installed between the first bearing seat 1021 and the upper mounting bracket 102, and a second pressure sensor 8 is installed between the first bearing seat 1021 and the upper mounting bracket 102 on each side. Two third pressure sensors 9 are provided, the third pressure sensor 9 is installed between the second bearing seat 1022 and the upper mounting bracket 102, and a third pressure sensor 9 is installed between the second bearing seat 1022 and the upper mounting bracket 102 on each side.

[0044] An upper travel limit switch 1031 and a lower travel limit switch 1032 for limiting the travel of the weight box 101 are installed on the vertical guide rod 103 , and the electric control box 6 is electrically connected to the upper travel limit switch 1031 and the lower travel limit switch 1032 .

[0045] The utility model of the belt conveyor weight anti-fall tensioning device has three working modes: anti-fall mode, maintenance mode and manual operation mode. Among them, the manual operation mode is used during the initial installation and commissioning of the device, automatic function failure and maintenance.

[0046] In the anti-fall mode: Since one end of the steel wire rope 4 is fixed to the connecting rod 11 and the other end is fixed to the reel 301 of the reel assembly 3, the steel wire rope 4 always maintains a certain tension under the action of the spring 106, and the length of the steel wire rope 4 is automatically adjusted according to the pressure value of the first pressure sensor 7 below the spring 106, so that the length of the steel wire rope 4 is automatically compensated as the weight box 101 moves up and down. The specific situation is as follows:

[0047] In the anti-fall mode, when the belt conveyor is operating normally, the belt tension changes due to the operating conditions (full load, no load, start-up, shutdown, etc.). The belt is an elastic body, and the belt length changes with the belt tension, causing the weight box 101 to move up and down in the vertical direction. In order to ensure that the wire rope 4 is always in contact with the guide pulley 1011 and does not disengage, the spring 106 is always kept in a compressed state. The wire rope maintains a tension range of P3 to P4 (P3 < P4). That is, in the anti-fall mode, the first pressure sensor 7 detects that the minimum pressure of the spring 106 is P3 and the maximum pressure is P4. The impact generated by the up and down movement of the weight box 101 is absorbed and adjusted by the spring 106. As time goes by, the belt produces permanent elongation under the action of tension, causing the weight box 101 to move downward, the spring 106 to be compressed, and the pressure of the spring 106 on the first pressure sensor 7 gradually increases to P4. At this time, the brake shoe 505 of the brake opens and separates from the brake wheel. At the same time, the permanent magnet synchronous variable frequency speed regulation motor 201 starts to rotate counterclockwise at a low speed of n1 (r / min), the wire rope 4 is slowly released, and the pressure of the spring 106 on the first pressure sensor 7 gradually decreases. When the pressure decreases to P3, the permanent magnet synchronous variable frequency speed regulation motor 201 stops working, and at the same time, the brake shoe 505 of the brake closes to apply a braking effect to the reel.

[0048] When the belt breaks, the wire rope 4 can stop the weight box 101 from falling in time and maintain the height of the weight box 101. The spring 106 at the fixed end of the wire rope 4 is compressed to absorb the impact energy, which greatly reduces the inertial impact of the weight box 101 when it falls, and avoids the wire rope 4 being broken by excessive inertial impact. Then the wire rope 4 can pull the falling weight box 101, preventing the weight box 101 from hitting people or falling on equipment and damaging the equipment, while avoiding the weight box 101 from being damaged, thereby increasing the safety of operation.

[0049] Belt break detection principle: When the belt 10 is wound around the first bend roller 104 and the second bend roller 105, the belt tension generates vertical pressure on the first bend roller 104 and the second bend roller 105. Since the second pressure sensor 8 detects the tension of the belt 10 wound around the first bend roller 104, and the third pressure sensor 9 detects the tension of the belt 10 wound around the second bend roller 105, when the belt 10 breaks, the pressure generated by the belt 10 on the first bend roller 104 and the second bend roller 105 decreases sharply, and this pressure is used as the basis for detecting belt failure. When the conveyor is operating normally, the tension of the belt 10 changes due to the influence of the working conditions (full load, no load, start, stop, etc.), causing the pressure on the sensor to fluctuate. Taking the pressure exerted by the belt 10 on the first bend roller 104 as an example, since the second pressure sensor 8 detects the tension of the belt 10 wrapped around the first bend roller 104, assuming the belt is operating normally, the maximum pressure exerted on the second pressure sensor 8 by the belt 10 and the first bend roller 104 is P1, and the minimum pressure is P2. In the anti-fall mode, if the pressure value measured by any of the second pressure sensors 8 is less than P2, the conveyor belt is deemed broken and failed. At this point, the brake shoe 505 of the brake closes and applies a braking action to the drum. If the belt breaks, the brake shoe 505 is in the open state, and the electrical control box 6 de-energizes the pusher 501, causing the brake shoe 505 to quickly reset under the action of the spring pull rod 1102. The brake shoe 505 grips the brake wheel, forcing the brake shoe 505 to switch to the closed state and shutting down the permanent magnet synchronous variable frequency speed control motor 201.

[0050] In maintenance mode, the weight box 101 automatically raises to a set height, slackening the belt 10 and facilitating component repair or replacement. After maintenance, the weight box 101 automatically returns to its original height. This simplifies operation compared to manually raising or lowering the weight box based on visual inspection, effectively preventing collisions with overhead equipment or foundations caused by excessive manual lifting. Its compact structure eliminates the need for extensive lifting space, making it easy to deploy.

[0051] Furthermore, vertical guide rod 103 is equipped with an upper limit switch 1031 and a lower limit switch 1032, which limit the travel of weight box 101. The electrical control box 6 is electrically connected to these upper and lower limit switches 1031, 1032. This function is used to detect whether the belt conveyor's weight anti-fall tensioning device is within its preset travel, preventing accidents caused by belt tension failure due to excessive belt extension. Furthermore, if the electrical control box 6 is connected to the conveyor's DSC system, remote control is possible, further simplifying operation.

[0052] The lifting and lowering process of the hammer box in maintenance mode:

[0053] During the lifting process of the weight box: the brake shoe 505 of the brake is opened, and the permanent magnet synchronous variable frequency speed regulating motor 201 starts to rotate clockwise at a speed of n2 (r / min) Figure 2 The drum 301 rotates counterclockwise to reel in the wire rope 4, and the weight box 101 is lifted. The first pressure sensor 7 detects that the pressure of the spring 106 increases to P5. When the top of the weight box 101 reaches the upper limit switch 1031, the permanent magnet synchronous variable frequency speed regulating motor 201 stops working, and the brake shoe 505 of the brake closes to apply a braking effect to the drum, and the positioning and lifting process of the weight box 101 ends.

[0054] The above P3<P4<P5, in the anti-fall mode, the wire rope maintains the tension range of P3~P4, when in the maintenance mode, the tension of the wire rope will increase to P5 when the weight box is lifted.

[0055] During the descending process of the weight box: the brake shoe 505 of the brake is opened, and the permanent magnet synchronous variable frequency speed regulating motor 201 starts to rotate counterclockwise at a speed of n2 (r / min) Figure 2 When the spring 106 exerts pressure on the first pressure sensor 7 to P4, the permanent magnet synchronous variable frequency speed regulating motor 201 starts to rotate counterclockwise (facing the motor shaft) at a low speed of n1 (r / min). When the spring 106 exerts pressure on the pressure sensor 1 to P3, the permanent magnet synchronous variable frequency speed regulating motor 201 stops working. At the same time, the brake shoe 505 of the brake closes to apply braking action on the drum, and the automatic resetting process of the weight box 101 is completed.

[0056] In summary, the utility model enables the length of the wire rope to automatically extend or retract as the weight box moves, realizing automatic compensation, so that the wire rope is always in a tensioned state, and can effectively prevent the belt from being damaged due to the excessive length of the wire rope contacting the belt. A spring is provided between the pull rod fixedly connected to one end of the wire rope and the upper mounting bracket. When the belt breaks, the wire rope can quickly pull the weight box, preventing the weight box from falling in time and maintaining the height of the weight box. The spring at the fixed end of the wire rope is compressed to absorb the impact energy, effectively reducing the inertial impact of the weight box when it falls, and greatly increasing the safety of the operation of the vertical weight tensioning device. When the equipment is being repaired, the weight box can automatically stop at the set upper travel limit switch. After the repair is completed,

[0057] The electronic control box automatically resets the weight box to its pre-lift position based on pressure signals detected by the first, second, and third pressure sensors, significantly simplifying operation. Furthermore, a lower limit switch is installed on the vertical guide rod to limit the weight box's travel, preventing accidents caused by excessive belt extension and tension failure. Furthermore, if the electronic control box of the belt conveyor weight anti-fall tensioning device is connected to the conveyor's DSC system, remote control is possible, further simplifying operation.

[0058] The technical solution of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Those skilled in the art should understand that various changes made thereto in form and details fall within the scope of protection defined by the claims of the present invention.

Claims

1. A belt conveyor weight anti-fall tensioning device is installed on a belt conveyor. The belt conveyor includes a weight box, an upper mounting bracket, and a vertical guide rod fixedly connected to the upper mounting bracket. The weight box can move up and down along the vertical guide rod. The upper mounting bracket is mounted with a first bend roller and a second bend roller. The weight box is mounted with a third bend roller. The belt is wound around the first, second, and third bend rollers. The device is characterized in that: The belt conveyor weight anti-fall tensioning device includes a driving device, a drum assembly, a steel wire rope, a pull rod and a guide pulley, wherein the guide pulley is mounted on the weight box, the driving device, the pull rod and the drum assembly are mounted on the upper mounting bracket, and a spring is provided between the pull rod and the upper mounting bracket. The steel wire rope is wound around the guide pulley and one end is fixedly connected to the pull rod, and the other end is fixedly connected to the drum of the drum assembly. The driving device drives the drum of the drum assembly to rotate to retract and release the steel wire rope, and then the steel wire rope pulls the weight box to move up and down along the vertical guide rod.

2. The belt conveyor weight anti-falling tensioning device according to claim 1, characterized in that: The reel assembly includes the reel and a reel support. Reel shafts are fixed to both ends of the reel, and the reel shafts are rotatably mounted on the reel support.

3. The belt conveyor weight anti-falling tensioning device according to claim 2, characterized in that: The driving device includes a permanent magnet synchronous variable frequency speed regulating motor and a worm gear transmission device, the output shaft of the permanent magnet synchronous variable frequency speed regulating motor is fixedly connected to the worm, the worm wheel is fixed on the worm wheel shaft, and the worm wheel shaft is connected to the drum shaft through a coupling.

4. The belt conveyor weight anti-falling tensioning device according to claim 3, characterized in that: The belt conveyor weight anti-falling tensioning device includes a brake for braking the worm gear shaft.

5. The belt conveyor weight anti-falling tensioning device according to claim 4, characterized in that: The brake includes a pusher, a spring pull rod, a connecting lever, two brake arms, a connecting rod and a brake shoe. The brake shoe is hinged at the middle of the brake arm, and the lower end of the brake arm is hinged to the upper mounting bracket. The two brake arms are respectively the first brake arm and the second brake arm. The upper end of the first brake arm is hinged to one end of the connecting rod, and one end of the connecting lever is respectively hinged to the other end of the connecting rod and the upper end of the second brake arm. The other end of the connecting lever is hinged to the push rod of the pusher, one end of the spring pull rod is hinged to the upper mounting bracket, and the other end is hinged to the middle of the connecting lever. A brake wheel corresponding to the brake shoe is fixed on the worm gear shaft and / or the reel shaft. When in the braking state, the two brake shoes hold the brake wheel tightly.

6. The belt conveyor weight anti-falling tensioning device according to claim 3, characterized in that: The belt conveyor weight anti-falling tensioning device includes an electric control box, and the electric control box is electrically connected to the permanent magnet synchronous variable frequency speed regulating motor.

7. The belt conveyor weight anti-falling tensioning device according to claim 6, characterized in that: A first pressure sensor is arranged between the pull rod and the upper mounting bracket, and a second pressure sensor and a third pressure sensor are arranged on the upper mounting bracket. The second pressure sensor detects the tension of the belt wound around the first redirecting roller, and the third pressure sensor detects the tension of the belt wound around the second redirecting roller. The electrical control box is electrically connected to the first pressure sensor, the second pressure sensor and the third pressure sensor respectively.

8. The belt conveyor weight anti-falling tensioning device according to claim 7, characterized in that: A first bearing seat for mounting the first redirecting roller and a second bearing seat for mounting the second redirecting roller are fixed on the upper mounting bracket. The second pressure sensor is installed between the first bearing seat and the upper mounting bracket, and the third pressure sensor is installed between the second bearing seat and the upper mounting bracket.

9. The belt conveyor weight anti-falling tensioning device according to claim 7, characterized in that: An upper travel limit switch and a lower travel limit switch for limiting the travel of the weight box are installed on the vertical guide rod, and the electric control box is electrically connected to the upper travel limit switch and the lower travel limit switch.

10. The belt conveyor weight anti-falling tensioning device according to claim 3, characterized in that: The worm is a self-locking cylindrical worm with a lead angle less than 30°30′.

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