KR101421828B1 - Appratus for exchanging pulley in conveyor belt and method thereof - Google Patents

Abstract

An apparatus and method for changing a drive pulley of a belt conveyor in which the efficiency of a drive pulley replacement operation of a belt conveyor is improved is introduced.
A drive pulley change device of a belt conveyor according to the present invention comprises: a fixing part for pressing and fixing a return belt and a conveyance belt of a belt conveyor which maintains tension by using a weight; And a lifting section for lifting the weight to remove tension applied to the belt conveyor. The method for exchanging a drive pulley of a belt conveyor according to the present invention is characterized in that a return belt and a conveyance belt of a belt conveyor, And the drive pulley is exchanged after the tension applied to the belt conveyor is removed by lifting the weight.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for replacing a drive pulley of a belt conveyor,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and method for changing a drive pulley of a belt conveyor, and more particularly, to an apparatus and method for replacing a drive pulley of a belt conveyor that improves the efficiency of a drive pulley replacement operation by fixing a conveyor belt and a return belt, Device and method thereof.

In general, belt conveyors are widely used in various fields as a means of transporting goods, and steel mills are also used as a means of transporting ores, coke, coal and other additives.

Most of the belt conveyors are made of elastic material, and the belt conveyor should always maintain the tension in consideration of the power transmission and transportation efficiency in the course of transporting the goods.

On the other hand, when such a belt conveyor is used for a long period of time, abrasion occurs on the belt pulley, which causes various problems such as belt meandering. Therefore, the belt pulley must be replaced at an appropriate point in time.

In the process of replacing the belt pulley, the above-mentioned tension on the belt hinders the efficiency of the exchange operation.

As shown in Fig. 1, a belt conveyor rotating in an endless track includes a belt C, a head pulley H, a pair of bend pulleys B, a tension pulley T, and a weight W , The tension of the belt C is maintained by the weight W fixedly coupled to both ends of the tension pulley T.

In the case where various pulley exchange operations such as the head pulley H and the bend pulley B are carried out while maintaining the tension on the belt C due to the tension applied to the head pulley H and the bend pulley B, As the efficiency deteriorates, it is necessary to perform the exchange operation with the tension removed.

That is, since the replacement of the head pulley H must be performed in a state where a specific portion of the belt C is fixed, a long time is required for the replacement work and a predetermined number of workers must be input, do.

Japanese Patent Application Laid-Open No. 2002-114352 (Apr. 16, 2002) discloses "a belt conveyor apparatus and a conveyor belt exchange apparatus and a method for exchanging ".

The present invention relates to an apparatus and method for replacing a conveying belt by replacing the conveying belt by lifting the conveying belt itself by engaging a swapping device on an axis of a driving pulley mounted on a side surface of the conveying belt.

However, this is used for transportation of crops, and is effective for a conveyer belt replacement operation with a short length. However, it is difficult to apply to a belt conveyor replacement operation in which a very long length is used in steelworks or the like. There is a problem that all constituent parts such as a belt must be separated.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as adhering to the prior art already known to those skilled in the art.

Japanese Patent Application Laid-Open No. 2002-114352 (Apr. 16, 2002)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus for replacing a drive pulley of a belt conveyor and a method thereof, in which a belt is fixed and a drive pulley is exchanged while tension is removed.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a belt driving apparatus for a belt conveyor, comprising: a fixing unit for pressing and fixing a return belt and a conveyance belt of a belt conveyor, And a hoisting portion for lifting the weight to remove a tension applied to the belt conveyor.

The fixing unit includes a fixing bracket fixedly installed in a widthwise direction of a belt frame provided with a plurality of conveying rolls and a fixing bracket disposed between the fixing bracket and the conveying belt for selectively lowering the conveying belt so as to press- And a lower bracket positioned between the fixing bracket and the return belt to selectively press up and release the return belt.

And a cylinder communicating with the cylinder hole is provided at both ends of the upper bracket in a position corresponding to the cylinder hole, and a cylinder communicating with the cylinder hole is provided at both ends of the upper bracket, And a compression spring is wound around an outer circumferential surface of the cylinder rod. The compression spring is wound around the cylinder rod.

A horizontal plate is coupled to both ends of the bottom surface of the lower bracket, a vertical plate is rotatably coupled to both ends of the horizontal plate, and a support bolt is coupled to a lower end of the vertical plate.

The end of the vertical plate is bent in the outward direction of the lower bracket and the support bolt is positioned at one end plane of the upper bracket when the vertical plate is rotated by 180 °.

Wherein an upper rubber having a width corresponding to the width of the conveyance belt is mounted on the bottom surface of the upper bracket and an upper fixing rubber having a width corresponding to the width of the conveyance belt and the return belt, And a lower rubber corresponding to the width of the return belt is mounted on a plane of the lower bracket.

And an air supply line is connected to the cylinder.

Wherein the hoisting portion includes a driving motor, a driving drum having a central shaft connected to the driving motor, a first lower pulley and a second lower pulley interposed between the driving motor and the first lower pulley, A first driving pulley having one end connected to the driving drum passes through the first lower pulley and the first upper pulley, and the other end of the weight is connected to the other end of the second driving pulley, And a second driving wire having one end connected to the driving drum is connected to the second lower pulley and the second upper pulley and the other end is connected to the other end of the weight, Are combined with each other.

Wherein the hoisting portion further comprises a vertical frame, the first lower pulley and the second lower pulley are respectively coupled to lower ends of both sides of the vertical frame, and the first upper pulley and the second upper pulley are connected to both sides And a first center pulley and a second center pulley are respectively installed on upper and lower ends of both upper and lower sides of the vertical frame, respectively, and the first driving wire is connected to the first lower pulley, the first upper pulley, And the second driving wire passes through the second lower pulley, the second upper pulley and the second center pulley.

In order to accomplish the above object, there is also provided a method of replacing a driving pulley of a belt conveyor according to the present invention, comprising: applying a pressure to a return belt and a conveyance belt of a belt conveyor for retaining tension using a weight, And the driving pulley is exchanged after the tension applied to the belt conveyor is removed.

The method of replacing a belt conveyor drive pulley according to the present invention comprises the steps of raising a lower bracket positioned with a return belt therebetween with reference to a stationary bracket and pressing and fixing the return belt on the bottom surface of the stationary bracket, Closing the upper bracket positioned between the conveyor belts and lowering the upper conveyor belts so that the conveyor belts are clamped and fixed on the plane of the fixing brackets to reduce the tension applied to the conveyor belts and the return belts by removing the load of the weights, And replacing the drive pulley in a state in which the drive pulley is in a state of being removed.

And fixing the position of the upper bracket and the lower bracket so that the transfer belt and the return belt can be maintained in a state where the transfer belt and the return belt are pressed on the fixing bracket.

The present invention is advantageous in that the efficiency of the work can be improved because the pulley exchange operation such as the drive pulley can be performed without the need of a minimum number of workforce and additional equipment due to the technical features described above.

1 shows a general belt conveyor system,
FIG. 2 is a perspective view of a fixing part of the present invention,
FIG. 3 is an exploded perspective view of a fixing part, which is a part of the present invention,
FIG. 4A is a view showing a state before operation of the fixing part, which is a part of the present invention,
FIG. 4B is a view illustrating a process of moving the lower bracket of the stationary part, which is a part of the present invention,
FIG. 4c is a view illustrating a process of moving the upper bracket of the stationary part, which is a part of the present invention,
FIG. 4 (d) is a view showing a clamping and fixing state of the fixing part, which is a part of the present invention,
5 is a view showing a hoisting part which is a work piece of the present invention,
6 is a view showing an installation state of the upper part of the winding part of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, an apparatus and method for replacing a drive pulley of a belt conveyor according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in Figs. 2 and 3, the drive pulley change device of the belt conveyor of the present invention includes a fixing portion 10 and a winding portion 20.

The fixing unit 10 functions to press and fix a belt conveyor that conveys the conveyed material while maintaining the tension by using the weight W. The fixing unit 10 includes a conveyor belt TB constituting a belt conveyor, Both of the return belts (BB) are pressed and fixed. That is, the fixing portion 10 presses and fixes the conveyance belt TB downward and presses the return belt BB upward from below to fix the conveyance belt TB.

When the conveyance belt TB and the return belt BB are fixed by the fixing unit 10, the upper portion 20 lifts the weight W and releases the tension applied to the conveyance belt TB and the return belt BB do. In the state in which the tension is released, the transfer belt TB and the return belt BB are not in contact with the drive pulley in an unstressed state, which is advantageous in that the drive pulley replacement operation becomes smooth.

The fixing portion 10 preferably includes a fixing bracket 14, an upper bracket 12, and a lower bracket 16.

The fixing bracket 14 is fixedly mounted on a belt frame F provided with a plurality of feed rolls R. The fixing bracket 14 is formed long in the width direction of the belt frame F and has a length longer than the widths of the conveyance belt TB and the return belt BB.

Upper and lower brackets 12 and 16 are provided on upper and lower portions of the fixing bracket 14, respectively.

The upper bracket 12 is positioned above the fixing bracket 14 with the transfer belt TB therebetween and the lower bracket 16 is positioned below the fixing bracket 14 with the return belt BB therebetween do.

The upper bracket 12 and the lower bracket 16 are also formed to be long in the width direction of the conveyance belt TB and the return belt BB like the fixing bracket 14 and have a length corresponding to the length of the fixing bracket 14 The same length is formed.

The lower bracket 16 is moved to the bottom surface of the fixing bracket 14 so that the return belt BB is pressed and fixed and the upper bracket 12 is also moved to the plane of the fixing bracket 14 The conveyance belt TB is pressed and fixed.

As described above, both of the conveyance belt TB moving on the conveying roll R and the return belt BB returned from the head pulley H and moving are both the upper bracket 12, the fixing bracket 14, the lower bracket 16 The upper bracket 12 is moved upward and the lower bracket 16 is moved downward to release the fixing of the conveyance belt TB and the return belt BB do.

The lower bracket 16 and the upper bracket 12 respectively press up and fix the conveyance belt TB and the return belt BB while raising and lowering the lower bracket 16 and the upper bracket 12 Will be described.

At both ends of the fixing bracket 14, a cylinder hole 14a is vertically formed.

A cylinder 12a communicating with the cylinder hole 14a is provided at a position corresponding to the cylinder hole 14a at both ends of the upper bracket 12. A cylinder hole 14a is formed at both ends of the lower bracket 16, So that the cylinder rod 16a is drawn out and protruded from the cylinder 12a.

A compression spring 17 is wound on the outer circumferential surface of the cylinder rod 16a and both ends of the compression spring 17 are fixedly coupled to the outer circumferential surface of the cylinder rod 16a.

The compression spring 17 functions to maintain the gap between the upper bracket 12 and the fixing bracket 14 before the belt conveyor drive pulley replacement apparatus of the present invention operates. That is, the cylinder rod 16a inserted through the cylinder hole 14a and inserted into the cylinder 12a can not be completely inserted into the cylinder 12a due to the compression spring 17, 12 and the plane of the fixing bracket 14 while maintaining the gap between the upper bracket 12 and the fixing bracket 14. [

On the other hand, horizontal plates HP are coupled to both side ends of the bottom surface of the lower bracket 16, respectively. The end of the horizontal plate HP is formed to protrude a predetermined length outward from the end of the lower bracket 16.

In this way, the vertical plate VP is rotatably coupled to the end of the horizontal plate HP, which is protruded by a predetermined length in the outward direction than the end of the lower bracket 16. A support bolt SB is coupled to the lower end of the vertical plate VP.

It is preferable that the end of the vertical plate VP is formed by bending a predetermined length in the outer direction of the lower bracket 16. When the vertical plate VP rotates 180 degrees and reaches the 12 o'clock position, So that the bolt SB can be positioned on one plane of the upper bracket 12.

That is, when the support bolt SB is positioned on one plane of the upper bracket 12 together with the rotation of the vertical plate VP, the fixing operation of the conveyance belt TB and the return belt BB is completed.

An upper rubber 12b having a width corresponding to the width of the conveyance belt TB is mounted on the bottom surface of the upper bracket 12 and a conveyance belt TB and a return belt An upper fixing rubber 14b and a lower fixing rubber 14c having a width corresponding to the width of the lower bracket 16 are mounted respectively on the lower bracket 16 and a lower rubber 16b are mounted.

The upper rubber 12b, the upper fixing rubber 14b, the lower fixing rubber 14c and the lower rubber 16b are damaged by scratches or the like on the belt surface during the process of fixing the transfer belt TB and the return belt BB .

Shaped protrusions are formed on the surfaces of the upper rubber 12b, the upper fixing rubber 14b, the lower fixing rubber 14c and the lower rubber 16b so that the upper bracket 12, the lower bracket 16, , And the fixing bracket (14).

The drive pulley change device of the belt conveyor of the present invention further includes an air supply line L which supplies air to the cylinder 12a or removes air from the cylinder 12a, 12a to the cylinder rod 16a.

Referring to Figs. 4A to 4D, the operation of the fixed portion of the drive pulley replacement device of the belt conveyor of the present invention will be described.

4A, the upper bracket 12 and the fixing bracket 14 are fixed before the transfer belt TB and the return belt BB are fixed to each other, and between the lower bracket 16 and the fixing bracket 14, The upper end of the compression spring 17 wound on the cylinder rod 16a supports the bottom surface of the upper bracket 12 and the lower end of the compression spring 17 is supported on the plane of the fixing bracket 14. [

And the entire fixing portion 10 is seated on the ground by the supporting bolts SB fixed to the lower end of the vertical plate VP.

The cylinder rod 16a protrudes from the cylinder 12a with the maximum stroke value while air is supplied to the inside of the cylinder 12a before the fixed portion 10 is operated.

4B, when the air filled in the cylinder 12a is discharged through the air supply line L, the cylinder rod 16a is inserted into the cylinder 12a, and at the same time, the lower bracket 16 is raised The lower rubber 16b coupled to the plane of the lower bracket 16 is brought into contact with the bottom surface of the return belt BB and the plane of the return belt BB is fixed to the stationary bracket 16 14, the lower fixing rubber 14c mounted on the bottom of the lower fixing rubber 14c, and the fixing process of the return belt BB is completed.

As shown in FIG. 4C, as the air in the cylinder 12a continues to escape through the air supply line L, the cylinder 12a descends while the upper bracket 12 also descends. That is, the cylinder rod 16a can no longer be inserted into the cylinder 12a in a state where the lower bracket 16 is pressed and fixed to the bottom surface of the stationary bracket 14, and the cylinder 12a and the upper bracket 14b (12) is lowered.

The upper rubber 12b fixedly mounted on the bottom surface of the upper bracket 12 is brought into contact with the plane of the conveyance belt TB at the same time when the upper bracket 12 descends and when the upper bracket 12 further descends, The lower surface of the fixing bracket 14 is brought into close contact with the upper fixing rubber 14b mounted on the plane of the fixing bracket 14, so that the fixing of the conveyance belt TB is completed.

As described above, when the fixing of the return belt BB and the conveyance belt TB is completed, the primary fixing operation is completed.

4D, when the primary fixing operation is completed, the vertical plate VP is rotated 180 DEG with respect to the horizontal plate HP. When the vertical plate VP is rotated by 180 degrees, the supporting bolts SB fixed to the lower end of the vertical plate VP are placed on the ends of the upper bracket 12 to complete the secondary fixing operation. VP are positioned on the upper end of the upper bracket 12 so that the vertical plate VP covers the upper bracket 12 and the lower bracket 16 as a whole.

As described above, when the conveyance belt TB and the return belt BB are fixed by pressing, the work of releasing the tension proceeds.

As shown in Figs. 5 and 6, the operation of releasing the tension lifts the weight W fixed to the bending pulley B so that the weight W catches the conveyance belt TB to the return belt BB It is done in such a way as not to pull.

The upper portion 20 of the winding is used to lift the weight W.

The pulley upper portion 20 includes a driving motor M, a driving drum D, a first lower pulley 22, a second lower pulley 24, a first upper pulley 26, a second upper pulley 28, A first hook H1, a second hook H2, a first driving wire W1, and a second driving wire W2.

A central axis of the driving drum D is connected to the driving motor M and a first lower pulley 22 and a second lower pulley 24 are provided with the driving motor M interposed therebetween.

A first upper pulley 26 is installed at a predetermined distance from the first lower pulley 22 and a second upper pulley 28 is installed at a height spaced apart from the second lower pulley 24 .

One end of the first driving wire W1 is connected to the driving drum D and passes through the first lower pulley 22 and the second upper pulley 28 and the first hook H1 is coupled to the other end .

One end of the second driving wire W2 is connected to the driving drum D separately from the first driving wire W1 and passes through the second lower pulley 24 and the second upper pulley 28, The second hook H2 is engaged.

It is preferable that the winding section 20 further includes a vertical frame VF so that the first lower pulley 22 and the second lower pulley 24 are coupled to the lower ends of both sides of the vertical frame VF, 1 upper pulleys 26 and second upper pulleys 28 are respectively coupled to both upper ends of the vertical frame VF.

A first center pulley 27 is provided at the upper center portion of both sides of the vertical frame VF to guide the movement path of the first driving wire W1 and the second driving wire W2 to one side and the other side of the weight W, And a second center pulley 29 are provided.

Thus, the first driving wire W1 passes through the first lower pulley 22, the first upper pulley 26 and the first center pulley 27, and the second driving wire W2 passes through the second lower pulley 24 The first hook H1 and the second hook H2 which are connected to the ends of the first and second upper pulleys 28 and 29 and the second center pulley 29, The weight W can be raised.

When the weight W rises, the tension applied to the tension pulley T and the bending pulley F is reduced, and various pulley exchange operations such as the drive pulley can be smoothly performed. 20, the efficiency of the drive pulley exchange operation can be improved.

On the other hand, in the method of exchanging the drive pulley of the belt conveyor according to the present invention, the return belt (BB) and the conveyance belt (TB) of the belt conveyor for retaining the tension by using the weight (W) The weight W is lifted to remove tension applied to the belt conveyor, and then various pulleys such as a drive pulley are exchanged.

This method of exchanging the belt conveyor drive pulley is performed by raising the lower bracket 16 positioned with the return belt BB therebetween with reference to the stationary bracket 14 so that the return belt BB is moved to the bottom of the stationary bracket 14 And the upper bracket 12 is lowered with the conveyance belt TB interposed therebetween with reference to the fixing bracket 14 so as to press and fix the conveyance belt TB on the plane of the fixing bracket 14 And fixing the position of the upper bracket 12 and the lower bracket 16 so that the transfer belt TB and the return belt BB can be maintained in a state where the transfer belt TB is pressed against the fixing bracket 14, A process of eliminating the load of the weight W to relieve the tension applied to the conveyance belt TB and the return belt BB and a process of replacing the drive pulley in a state in which the tension is relaxed, The operation of the belt conveyor drive pulley change device of the present invention It is a duplicate of the course description, so it should be replaced with the above explanation.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

10: fixing part 12: upper bracket
12a: cylinder 12b: upper rubber
14: Fixing bracket 14a: Cylinder hole
14b: upper fixing rubber 14c: lower fixing rubber
16: lower bracket 16a: cylinder rod
16b: lower rubber 17: compression spring
20: upper portion of winding 22: first lower pulley
24: second lower pulley 26: first upper pulley
27: first center pulley 28: second upper pulley
29: 2nd center pulley
W1: first driving wire W2: second driving wire
H1: first hook H2: second hook
TB: convey belt BB: return belt
HP: Horizontal Plate VP: Vertical Plate
SB: Support bolt L: Air supply line
F: Belt frame M: Drive motor
D: driving drum

Claims (12)

The conveyor belt TB is lowered by the weight W so as to maintain the tension of the belt conveyor constituted by the conveyor belt TB and the return belt BB so as to ascend to the upper bracket 12 for pressing / (10) including a lower bracket (16) for pressing / unlocking the return belt (BB); And
A driving drum D connected to the driving motor M and a central axis of the driving motor M is connected at one end to the driving drum D and at the other end so as to be coupled to both ends of the weight W, A pair of driving wires W1 and W2 to which the first hook H1 and the second hook H2 are coupled and a driving motor W2 for lifting the weight W to remove the tension of the belt conveyor, (20) including a plurality of pulleys for switching the traveling direction of the driving wires (W1, W2) moved by the driving pulley (M).
The method according to claim 1,
The fixing portion 10 includes a fixing bracket 14 fixedly provided in a width direction of a belt frame F provided with a plurality of conveyance rolls R,
The upper bracket 12 is positioned between the fixing bracket 14 and the conveyance belt TB and the lower bracket 16 is positioned between the fixing bracket 14 and the return belt BB And wherein the drive pulley of the belt conveyor is located at a predetermined position.
The method of claim 2,
At both ends of the fixing bracket 14, a cylinder hole 14a is vertically formed,
At both ends of the upper bracket 12, a cylinder 12a communicating with the cylinder hole 14a is provided at a position corresponding to the cylinder hole 14a,
At both ends of the lower bracket 16, a cylinder rod 16a penetrating through the cylinder hole 14a and being drawn into and out of the cylinder 12a is engaged,
And a compression spring (17) is wound around the outer circumferential surface of the cylinder rod (16a).
The method according to claim 2 or 3,
A horizontal plate HP is coupled to both ends of the bottom surface of the lower bracket 16 and a vertical plate VP is rotatably coupled to both ends of the horizontal plate HP. And a support bolt (SB) is coupled to the lower end of the drive pulley.
The method of claim 4,
The vertical plate VP is bent in the outer direction of the lower bracket 16 so that when the vertical plate VP rotates 180 degrees, Of the drive pulley of the belt conveyor.
The method of claim 5,
An upper rubber 12b having a width corresponding to the width of the conveyance belt TB is mounted on the bottom surface of the upper bracket 12 and the conveyance belts TB and / An upper fixing rubber 14b and a lower fixing rubber 14c having a width corresponding to the width of the return belt BB are respectively mounted on the lower bracket 16 and a width of the return belt BB Wherein the lower roller (16b) is mounted on the upper surface of the belt conveyor.
The method of claim 4,
Characterized in that an air supply line (L) is connected to the cylinder (12a).
The method according to claim 1,
The plurality of pulleys includes a first lower pulley 22 and a second lower pulley 24 spaced apart from each other with the driving motor M therebetween and a first lower pulley 22 and a second lower pulley 24, A first upper pulley 26 and a second upper pulley 28, respectively,
A pair of the driving wires W1 and W2 are constituted by a first driving wire W1 and a second driving wire W2 and a first driving wire W1 whose one end is connected to the driving drum D, The first hook H1 is coupled to the other end of the first lower pulley 22 and the first upper pulley 26 so as to be connected to one side of the weight W,
A second driving wire having one end connected to the driving drum D is connected to the second lower pulley 24 and the second upper pulley 28 and connected to the other end of the weight W Characterized in that a hook (H2) is coupled to the drive pulley of the belt conveyor.
The method of claim 8,
The winding top (20) further comprises a vertical frame,
The first lower pulley 22 and the second lower pulley 24 are coupled to lower ends of both sides of the vertical frame,
The first upper pulley 26 and the second upper pulley 28 are coupled to upper ends of both sides of the vertical frame,
A first center pulley 27 and a second center pulley 29 are installed on the upper center portion of both sides of the vertical frame respectively and the first driving wire W1 is connected to the first lower pulley 22, The second driving pulley W2 passes through the pulley 26 and the first center pulley 27 and the second driving pulley W2 passes through the second lower pulley 24, the second upper pulley 28 and the second center pulley 29 And the drive pulley of the belt conveyor.
delete A step of raising a lower bracket 16 located on the basis of the fixing bracket 14 with the return belt BB therebetween and pressing and fixing the return belt BB on the bottom surface of the fixing bracket,
Lowering the upper bracket 12 positioned on the basis of the fixing bracket 14 with the conveyance belt TB interposed therebetween so as to press and fix the conveyance belt TB on the plane of the fixing bracket,
Removing a weight of the weight (W) to relieve tension applied to the conveyance belt (TB) and the return belt (BB)
A method of replacing a drive pulley of a belt conveyor, comprising the step of replacing a drive pulley with the tension relaxed.
The method of claim 11,
A process of fixing the positions of the upper bracket 12 and the lower bracket 16 so that the conveyance belt TB and the return belt BB can be maintained in a state where the transfer belt TB and the return belt BB are pressed against the fixing bracket 14 Wherein the drive pulley is driven by the drive pulley.

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