Anti-falling tensioning device for heavy hammer of belt conveyor

Abstract

The invention 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 invention relates to the technical field of mining auxiliary equipment, and in particular to a belt conveyor weight anti-falling tensioning device. Background Art

[0002] As an economical and efficient tensioning form of belt conveyor, vertical weight tensioning device is widely used in belt conveyors of various industries. However, sometimes the vertical weight tensioning device has to be arranged on a high platform due to the requirements of the use location. Due to the aging of the conveyor belt over time, the failure of the belt joints, or the long-term wear of the belt to reduce the belt strength, the conveyor belt may suddenly break. At this time, the weight box of the vertical weight device will fall from a high altitude, causing a great impact force on the ground or platform below, and even personal accidents. Therefore, the safety of the vertical weight tensioning device is very important.

[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 to contact 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 fall of the 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] In addition, when the belt conveyor is inspected and repaired, the entire weight box needs to be lifted to reduce the belt tension and relax the belt. For example, when replacing the roller, it is convenient to remove the roller from under the belt and replace it after the belt is relaxed. The existing operation method is mostly to install an electric hoist above the tensioning device or use mobile lifting equipment. The operator lifts or lowers the weight box by visually estimating the height. The height error is large, and improper operation may cause the weight box to collide with the upper equipment or foundation. When the factory space is small, it is very inconvenient to use a mobile crane to lift the weight box. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a belt conveyor weight anti-falling 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-falling tensioning device is installed on the belt conveyor. The belt conveyor comprises 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 redirecting roller and a second redirecting roller. The weight box is equipped with a third redirecting roller. The belt is wound around the first redirecting roller, the second redirecting roller and the third redirecting roller. The belt is characterized in that:

[0008] The belt conveyor weight anti-falling tensioning device comprises 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 arranged 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 comprises the reel and a reel support, reel shafts are fixed at both ends of the reel, and the reel shafts are rotatably mounted on the reel support.

[0011] Preferably: the driving device comprises 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 comprises 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 part 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 part 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 comprises 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 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, 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 present invention are:

[0020] The belt conveyor weight anti-falling tensioning device of the present invention has a steel wire rope wound around a guide pulley and one end of the steel wire rope is fixedly connected to a pull rod, and the other end of the steel wire rope is fixedly connected to a reel of a reel assembly. The driving device drives the reel of the reel 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. The length of the steel wire rope is automatically extended or retracted as the weight box moves, and automatic compensation is achieved, so that the steel wire rope is always in a tensioned state, which can effectively prevent the belt from being damaged due to the excessive length of the steel wire rope contacting the belt. In addition, since a spring is arranged between the pull rod fixedly connected to one end of the steel wire rope and the upper mounting bracket, when the belt breaks, the steel wire rope can quickly pull the weight box, prevent the weight box from falling in time, and maintain the height of the weight box. The spring at the fixed end of the steel wire rope is compressed to absorb the impact energy, effectively reducing the inertial impact when the weight box falls, and greatly increasing the safety of the operation of the vertical weight tensioning device.

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

[0022] The electric control box cooperates with the second sensor and the third sensor to detect whether the belt is broken or not in time. When the electric control box determines that the conveyor belt is broken or not, the brake shoe of the brake closes and brakes the drum. If the belt is broken, the brake shoe is in the open state, and the electric control box cuts off the power of the pusher, and then the brake shoe is quickly reset under the action of the spring pull rod, and the brake shoe holds the brake wheel tightly, forcing the brake shoe to switch to closed, and the permanent magnet synchronous variable frequency speed regulating motor is shut down.

[0023] When the equipment is being overhauled, the belt conveyor weight anti-falling tensioning device of the present invention can automatically lift the weight box to a set height to loosen the belt, making it convenient for maintenance personnel to repair or replace parts of the belt conveyor. After the overhaul is completed, the weight box can automatically return to its original height position. Compared with manual lifting or lowering by visual inspection, the operation is simpler and effectively avoids the collision between the weight box and the upper equipment or foundation due to excessive manual lifting. It has a compact structure, does not need to occupy a large lifting space, and is easy to arrange.

[0024] In addition, a lower travel limit switch of the weight box travel limit is installed on the vertical guide rod to prevent the belt from over-extending and causing tension failure and causing accidents. Furthermore, if the electric control box of the belt conveyor weight anti-fall tensioning device of the present invention is connected to the DSC system of the conveyor, remote control can be realized, and the operation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the belt conveyor weight anti-falling tensioning device of the present invention (the belt is hidden);

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

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

[0028] Figure 4 It is a three-dimensional structural schematic diagram of the belt conveyor weight anti-falling tensioning device of the present invention when the first redirecting roller and the second redirecting roller are hidden;

[0029] Figure 5 yes Figure 4 A 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, driving device; 201, permanent magnet synchronous variable frequency speed regulating motor; 202, worm; 203, worm wheel; 204, worm wheel shaft ;2041, brake wheel; 3, drum assembly; 301, drum; 3010, drum shaft; 302, drum support; 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 in conjunction with 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. indicate directions or positional relationships 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, 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-falling 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 redirecting roller 104 and a second redirecting roller 105. The weight box 101 is equipped with a third redirecting roller. The belt 10 is wound around the first redirecting roller 104, the second redirecting roller 105 and the third redirecting roller 107.

[0035] The belt conveyor weight anti-fall tensioning device comprises 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, and 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. The two ends of the reel 301 are fixed with a reel shaft 3010, and the reel shaft 3010 is rotatably mounted on the reel support 302. The driving device 2 includes a permanent magnet synchronous variable frequency speed regulating motor 201 and a worm gear transmission device, the worm gear transmission device 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 on the worm wheel shaft 204, and the worm wheel shaft 204 is connected to the reel shaft 3010 through a coupling. The belt conveyor weight anti-falling tensioning device includes a brake 5 for braking the worm wheel shaft 204. It is preferred that the worm 202 is a self-locking cylindrical worm with a lead angle 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 is hinged, and 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 on the upper mounting bracket 102, and the other end is hinged to the middle part 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 gear 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 coupling. The brake 5 is a normally closed type, and the brake shoe 505 acts on the brake wheel coupling (or brake wheel) to prevent the reel 301 from rotating under the influence of external forces when not in operation.

[0040] like Figure 1 and Figure 2 As shown in the figure, before the pusher 501 is powered on, the brake is in a braking state (normally closed state) under the action of the spring pull rod 1102. After power is turned on, the pusher 501 works, and the push rod 5011 of the pusher 501 is lifted, and the brake spring pull rod 1102 is compressed through the lever system to open the brake shoe 505 (this is the brake release state). After power is turned off, the brake shoe 505 is quickly reset under the action of the brake spring pull rod 1102, and the brake shoe 505 holds the brake wheel tightly (this is the brake holding 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 arranged between the pull rod 11 and the upper mounting bracket 102, and a second pressure sensor 8 and a third pressure sensor 9 are arranged 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 sensors 9 are 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 belt conveyor weight anti-falling tensioning device of the present invention has three working modes: anti-falling mode, maintenance mode and manual operation mode. Among them, the manual operation mode is used when the device is first installed and debugged, automatic function fails and repairs and maintenance.

[0046] In the anti-fall mode: since one end of the steel wire rope 4 is fixed on the connecting rod 11 and the other end is fixedly connected 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 automatically adjusts the length of the steel wire rope 4 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, affected by the working conditions (full load, no load, start, stop, etc.), the belt tension changes. 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 keep the wire rope 4 in contact with the guide pulley 1011 without separation, the spring 106 is always kept in a compressed state, and 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 brake the drum.

[0048] When the belt breaks, the wire rope 4 can promptly stop the weight box 101 from falling 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 fallen weight box 101, preventing the weight box 101 from hitting people or falling on equipment to hit the equipment and avoid damage to the weight box 101, thereby increasing the safety of operation.

[0049] Belt break detection principle: When the belt 10 is wound on the first redirecting roller 104 and the second redirecting roller 105, the belt tension generates vertical pressure on the first redirecting roller 104 and the second redirecting roller 105. Since the second pressure sensor 8 detects the tension of the belt 10 wound around the first redirecting roller 104, the third pressure sensor 9 detects the tension of the belt 10 wound around the second redirecting roller 105. When the belt 10 breaks, the pressure value generated by the belt 10 on the first redirecting roller 104 and the second redirecting 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 working conditions (full load, no load, start, stop, etc.), causing the pressure on the sensor to fluctuate. Taking the pressure of the belt 10 on the first redirecting roller 104 as an example, since the second pressure sensor 8 detects the tension of the belt 10 wound around the first redirecting roller 104, assuming that the belt operates normally, the maximum pressure P1 and the minimum pressure P2 generated by the belt 10 and the first redirecting roller 104 on the second pressure sensor 8. In the anti-fall mode, if the pressure value measured by any second pressure sensor 8 is less than P2, it is determined that the conveyor belt is broken and failed, and the brake shoe 505 of the brake is closed to apply a braking effect to the reel. If the belt breaks, the brake shoe 505 is in the open state, the electric control box 6 makes the pusher 501 power off, and then the brake shoe 505 is quickly reset under the action of the spring pull rod 1102, and the brake shoe 505 holds the brake wheel tightly, forcing the brake shoe 505 to switch to closed, and the permanent magnet synchronous variable frequency speed regulating motor 201 is shut down.

[0050] In the maintenance mode, the weight box 101 can be automatically lifted to the set height to relax the belt 10, which is convenient for maintenance personnel to repair or replace parts of the belt conveyor. After the maintenance is completed, the weight box 101 can automatically return to its original height position. Compared with the manual lifting or lowering operation by visual inspection, the operation is simpler and effectively avoids the collision between the weight box and the upper equipment or foundation due to excessive manual lifting. It has a compact structure, does not need to occupy a large lifting space, and is easy to arrange.

[0051] In addition, the vertical guide rod 103 is equipped with an upper travel limit switch 1031 and a lower travel limit switch 1032 that limit the travel of the weight box 101, and the electric control box 6 is electrically connected to the upper travel limit switch 1031 and the lower travel limit switch 1032. It is used to detect whether the belt conveyor weight anti-fall tensioning device is within the preset travel, to prevent the belt from being stretched too much and causing tension failure and causing accidents. In addition, if the electric control box 6 is connected to the DSC system of the conveyor, remote control can be realized, and the operation is more convenient.

[0052] The lifting and lowering process of the weight box in the 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 travel 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 brake 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 pressure of the spring 106 on the first pressure sensor 7 is reduced 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 pressure of the spring 106 on the pressure sensor 10 is reduced to P3, the permanent magnet synchronous variable frequency speed regulating motor 201 stops working and the brake shoe 505 of the brake is closed to brake the drum, and the automatic resetting process of the weight box 101 is completed.

[0056] In summary, the present invention enables the length of the wire rope to automatically extend or retract as the weight box moves, thereby achieving automatic compensation and keeping the wire rope in a tensioned state at all times. This can effectively prevent the belt from being damaged by contact with the belt due to the excessive length of the wire rope. A spring is provided between the pull rod to which one end of the wire rope is fixedly connected and the upper mounting bracket. When the belt breaks, the wire rope can quickly pull the weight box to prevent the weight box from falling in time and maintain 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, 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 electric control box controls the weight box to automatically reset to the position before lifting according to the pressure signals detected by the first pressure sensor, the second pressure sensor and the third pressure sensor, which greatly reduces the difficulty of operation. In addition, a lower travel limit switch for limiting the weight box travel is installed on the vertical guide rod to prevent accidents caused by tension failure due to excessive elongation of the belt. Furthermore, if the electric control box of the belt conveyor weight anti-falling tensioning device of the present invention is connected to the DSC system of the conveyor, remote control can be realized, and the operation is more convenient.

[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 protection scope defined by the claims of the present invention.

Claims

1. A belt conveyor weight anti-falling tensioning device is installed on a belt conveyor. The belt conveyor comprises 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 provided with a first redirecting roller and a second redirecting roller. The weight box is provided with a third redirecting roller. The belt is wound around the first redirecting roller, the second redirecting roller and the third redirecting roller. The belt is characterized in that: The belt conveyor weight anti-falling tensioning device comprises 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 arranged 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 comprises the reel and a reel support. Reel shafts are fixed at 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 comprises 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 part 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 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, 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 part of the connecting lever. A brake wheel corresponding to the brake shoe is fixed to 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 2, characterized in that: The belt conveyor weight anti-falling tensioning device comprises 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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