JP4011776B2 - Method and apparatus for processing used ST conveyor belt - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a conveyor belt (referred to as an ST conveyor belt) having a steel cord (also referred to as ST) used for long-distance conveyance of minerals, earth and sand, etc. Conveyor belts (also called old belts) are separated into their constituent materials (rubber materials, steel cords, etc.) and reused as resources (recycled), or pollution caused by incineration or landfilling is prevented. The present invention relates to a method and apparatus for treating an old belt.
[0002]
[Prior art]
Conventionally, old belts were disposed of as follows.
(1) Finely cut with a grinding cutter (for example, a diamond grindstone) or a pressing cutter (for example, a hydraulic guillotine), and then incinerated or landfilled.
(2) Cut into predetermined dimensions and reuse as protective material for conveyor hoppers and skirts, or as rugs.
(3) Depending on the worn state of the old belt, it may be recapped (regenerated).
[0003]
[Problems to be solved by the invention]
However, in the method of incineration and landfilling of (1) above, it is necessary to cut the steel cord short, it is very difficult to cut the steel cord short, the life of the cutting blade is short, several times Or the cutting blade cannot be cut by cutting several meters. In addition, a high temperature special incinerator is required for incineration and there is a risk of causing pollution problems of exhaust gas. Further, fine cutting is required for the landfill process, and there is a big problem in securing the landfill site.
[0004]
In the processing method by reuse (2) above, in addition to being difficult to cut as described above, there is little demand and it is not possible to utilize all of the old belt.
[0005]
In the above recycling method (3), there are few old belts that can be recapped, and the processing cost is high.
[0006]
An object of the present invention is to solve the above-mentioned problems by finding out a method capable of separating a used ST conveyor belt into a rubber material and a steel cord and using them as resources.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the processing method of claim 1 is to cut a used ST conveyor belt into a single core belt having a single steel cord after being cut into a thin strip along its length direction. The steel cord and the rubber material are separated by passing the core belt through a strip die.
[0008]
The ST conveyor belt is usually formed into a long flat plate by vulcanizing and forming 60 to 200 steel cords in parallel and laminating unvulcanized cover rubber or the like thereon. The single-core belt refers to a belt-like body in which an ST conveyor belt is cut into long strips for each steel cord pitch to form a single steel cord (core body). By cutting old belts into single core belts, it becomes easier to pass through a strip die, which will be described in detail later, and the work of separating the single core belt into a rubber material and a steel cord (also referred to as separation processing) becomes easy and easy. . Since the separation process is performed by passing the strip die, the operation can be continuously performed, and the degree of the separation can be improved, that is, the remaining amount of the rubber material attached to the steel cord can be reduced. The peeled rubber material can be crushed and used as rubber powder or recycled rubber, and the used steel cord from which the rubber material has been peeled (also referred to as used cord) can be reused as metal scrap.
[0009]
A processing method of a used ST conveyor belt according to claim 2 is a method of cutting the used ST conveyor belt into a small belt having a small number of plural steel cords, and dividing the small belt into the single belt. The used ST conveyor belt is cut into the single-core belt in a long and narrow manner by two steps including a splitting step for dividing the core belt.
[0010]
As mentioned above, ST conveyor belts usually use a large number of steel cords, and in order to slit them into a single core belt at a time, a large processing device is required, which increases the capital investment and work space, while the operating rate is This causes a problem that the processing cost is increased. In addition, in order to cut a wide old belt into a single core belt by cutting it long for each steel cord, there is a problem that the cutting time becomes long. Therefore, after first cutting the belt into 3 to 10 belt-like bodies (referred to as a split belt) in a long and narrow manner (referred to as a split), the split belt is divided into a plurality of single-core belts in the splitting process. It is efficient to divide and separate them by strip dies at the same time.
[0011]
The processing method of the used ST conveyor belt of Claim 3 performs the separation process in the state which heated the said strip die at 100-150 degreeC. The rubber material used for the ST conveyor belt is generally hard and difficult to cut, and when heated, it becomes somewhat soft. Utilizing this property, the separation process is facilitated by keeping the strip die at a predetermined temperature (100 to 150 ° C.). If it is less than 100 ° C., the rubber material is hard, and if it exceeds 150 ° C., the rubber material tends to be burned onto the strip die.
[0012]
The processing apparatus for a used ST conveyor belt according to claim 4, wherein a major cutting blade for cutting the used ST conveyor belt into a slender belt having a small number of plural steel cords, and rotating the major cutting blade. A belt feeding means for rotatably supporting the used ST conveyor belt by being attached to a shaft so as to be able to move away from the shaft, and a small cut to make a single core belt having a single steel cord by cutting the small belt into an elongated shape. Means, strip dies for separating the split single-core belt into a rubber material and a steel cord, and take-up means for winding up the steel cord from which the rubber material has been separated.
[0013]
The belt feeding means rotatably supports the old belt wound in the form of a hollow roll while maintaining a long length, and slowly feeds the old belt (small belt) roughly divided by the rotation of a take-up pulley, which will be described later in detail. . The major cutting blade is attached to the rotating shaft of the belt feeding means so as to be able to approach and separate, and is pushed into between the steel cords of the old belt (rubber material part) and rotated to rotate the old belt. Cut into long strips in the direction and split into small belts. The slit cutting means has a number of slit cutting blades that is one less than the number of steel cords of the split belt, and is between the steel cords of the split belt pulled by the winding drum (detailed later) (rubber material part). Push and cut into multiple single core belts. The strip die has the smallest inner diameter into which a steel cord can be inserted, and has a tubular nozzle that forms a thin circular blade on the upstream side in the moving direction of the steel cord. Insert a steel cord of a single-core belt that has been cut into a thin strip into the strip die (only the tip is separated manually), and forcibly pull out the steel cord with a cord take-up pulley, which will be described later in detail. Separate the rubber material (cover rubber) attached to the belt from the steel cord. The take-up means includes a take-up pulley that pulls a steel cord (used cord) from which rubber material is separated and a take-up drum that winds the used cord, and also has a function of forcibly pulling and winding the steel cord from the strip die. The separated rubber material is taken up by a rubber material take-up conveyor and guided to a predetermined storage means.
[0014]
The ST conveyor belt processing apparatus according to claim 5 is configured so that the strip die can be divided into a plurality of pieces. As described above, since the strip die has an inner diameter close to the outer diameter of the steel cord, it is not easy to first insert the steel cord from which the rubber material at the end of the single core belt is manually removed. Therefore, when the first steel cord is induced so that the strip dies can be divided into a plurality of pieces, the strip dies are divided to facilitate the induction of the steel cord, and after the steel cord is induced, the strip dies are closed and separated. As a result, it is easy to guide, and it is possible to perform an operation with less rubber material remaining on the used cord (high separation accuracy). The strip dice can be divided into three parts and four parts in addition to the case where the strip dies are divided into two parts in the vertical and horizontal directions. After the used cord is guided to the strip die, the load on the take-up pulley at the start of processing can be reduced by gradually tightening the strip die while pulling the used cord.
[0015]
The processing apparatus of Claim 6 has attached the incision knife to the upstream front-end | tip of the steel cord movement direction of the said strip die. Since the single core belt has a shape in which the steel cord is embedded in the rubber material, when the steel cord is pulled out with a strip die, the rubber material is smoothly separated when the rubber material is incised. When the material is tubular, it becomes a lump and does not become smooth. Therefore, an incision knife is attached to the tip end of the strip die in the moving direction of the steel cord in the moving direction of the steel cord. Thereby, the tubular rubber material is cut open and smoothly separated.
[0016]
According to a seventh aspect of the present invention, the strip die has a heating means. For example, it is possible to separate the rubber material while softening the rubber material by embedding an electric heater in a strip die and heating the circular blade to a predetermined temperature. This facilitates the separation process.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a processing method and a processing apparatus according to the present invention will be described with reference to the drawings.
[0018]
FIG. 1 is a plan view of a processing apparatus according to the present invention, and shows an outline of a state where an old belt is separated. FIG. 2 shows a front view of the apparatus of FIG. FIG. 3 shows a cross section in the width direction of the ST conveyor belt, and FIG. 4 shows a partially enlarged view of the strip die. First, the cross-sectional structure of the ST conveyor belt and the like will be described with reference to FIG.
[0019]
FIG. 3A is a sectional view in the width direction of the old belt a, and a steel cord 16 is embedded in the cover rubber 15. Although not shown in this figure, normally 60 to 200 steel cords 16 are used. FIG. 3B is a cross-sectional view of the split belt b. In this example, the split belt b is divided into three steel cords 16. Usually, it is designed to include 3 to 10 steel cords 16. FIG. 3C is a sectional view of the single core belt c, and one steel cord 16 is embedded in the cover rubber 15.
[0020]
The processing apparatus shown in FIG. 1 and FIG. 2 can be divided into a major process 31, a minor process 32, a strip process 33, and a winding process 34 according to the processing order. The split process 31 is a process of dividing the old belt a into the split belt b, and the split process 32 is a process of splitting the split belt b into the single core belt c. The stripping process 33 is a process of separating the single core belt c into the used cord e and the rubber material d, and the winding process 34 is a process of winding up the used cord e from which the rubber material d has been peeled off.
[0021]
As shown in FIG. 2, the splitting step 31 is provided with a rotating base 2 on an axis 42 erected on a base 41, and an old belt a wound in a roll shape is attached to the upper surface of the rotating base 2 so that it can be pulled out in the horizontal direction. . Note that the belt fixing band 8 is wound around a necessary portion so that the entire belt a wound in a roll shape is not rewound during rotation. Further, the old belt a is wound in a hollow roll shape, and the hollow portion is fitted on the rotary shaft 42 and placed on the upper surface of the turntable 2 so as to lie sideways. A large cutting blade 1 is attached to the base 41 so that it can be moved up and down by a support frame (not shown) and can be moved closer to and away from the shaft core 42, and is pressed against a position where the old belt a is divided. The upper part a ′ of the old belt a is cut by the large cutting blade 1 and is drawn out as a small belt b.
[0022]
The splitting process 32 includes a guide roll 10 and a guide roll 11 that reverse the split belt b pulled out with the width direction vertical from the splitting process 31 so that the width direction is horizontal, and the split belt b. A split cutting blade 3 for splitting the single core belt c is provided. The guide roll 11 has a pair of rolls, and the width direction of the guide roll 11 is horizontally reversed with the split belt b interposed therebetween, and the guide roll 11 is supplied to the position where the split cut blade 3 acts. The guide roll 10 is erected vertically against the force to be reversed applied to the small belt b so that the reversing force does not reach the large step 31. The number of the small cutting blades 3 is one less than the number of steel cords (two in this embodiment) and is pushed between the steel cords of the small belt b and the steel cords (rubber material part). The split belt b is divided into the same number of single-core belts c as the number of cords. The movement of the small belt b is driven by a take-up pulley 6 in a used cord winding process 34 described later in detail.
[0023]
The strip process 33 separates the split single-core belt c into a rubber material d and a used cord e. A strip die 4, a take-up conveyor 5 and a guide roll 12 are provided. The guide roll 12 guides the plurality of split single-core belts c to the positions of the strip dies 4. The take-up conveyor 5 collects the rubber material d separated from the steel cord in one direction and cuts the rubber material d by a predetermined amount by the cutter 9. The strip die 4 has a function of separating the rubber material d from the steel cord (used cord e) (details will be described later). The winding process 34 includes a take-up pulley 6 and a take-up drum 7, and the used cord e is strongly pulled by the take-up pulley 6 in the direction of the arrow y, and the tension necessary for the above-described splitting process or separation process by the strip die 4. The used cord e from which the rubber material d has been separated is taken up by the take-up drum 7. The rubber material d and the used cord e thus separated can be recycled and effectively used as resources.
[0024]
The configuration of the strip die 4 will be described with reference to FIG. 4A shows a left side view, and FIG. 4B shows a front view. The strip die 4 forms a circular blade portion 35 at the upstream end in the moving direction y of the used cord e, and passes the used cord e through the inside of the circular blade portion 35. As shown in FIG. 4 (b), the circular blade portion 35 is formed with a sharp blade at the upstream tip end in the traveling direction y of the used cord e, and the rubber material d and the used cord are drawn as the single-core belt c is drawn. Separate e. In this embodiment, the strip die 4 is designed so that it can be divided into upper and lower dies 21 and 22 (upper and lower halves are also divided into two). The upper die 21 is designed to be lifted upward by a hydraulic cylinder 23 supported by the frame 24 and to be pressurized downward. Further, the frame 24 can be moved toward and away from the single-core belt c together with the strip die 4, and the center position of the strip die 4 (the center position of the circular blade 35) shown in FIG. It is designed to be movable between a position (A) that overlaps the cross-sectional center position of c and a position (B) where the entire strip die 4 is separated from the single core belt c.
[0025]
As shown in FIG. 4, the cutting die 25 is attached to the strip die 4 on the outer side of the blade portion of the circular blade 35. The incision knife 25 is attached with its cutting edge directed in the moving direction of the single-core belt c, and comes into contact with the rubber material 15 of the single-core belt c with the upper die 21 lowered, according to the movement of the single-core belt c. The rubber material 15 is cut open. When the single core belt c moves while incising, the incised rubber material d (see FIG. 1) is smoothly and continuously peeled off. When the incision is not made, the rubber material 15 may be rolled up into a lump and cannot be peeled in a continuous state.
[0026]
Further, as shown in FIG. 4, a heater 26 is built in the strip die 4. For example, the heater 26 heats the strip die 4 to a predetermined temperature (100 to 150 ° C.) when an electric heater is used to perform the separation process. Accordingly, when the separation process is performed, the circular blade 35 is heated, and the rubber material 15 of the single core belt c is heated to facilitate the separation process.
[0027]
Although the processing method of the used ST conveyor belt using this apparatus has been partially described individually, the progress of the separation process is explained according to the processing steps using the processing apparatus of the present invention shown in FIGS. To do. First, the belt fixing band 8 is wound around the old belt a wound in the shape of a hollow roll in accordance with the number of the small belts b to be roughly divided, and the old belt a is placed on the turntable 2 as being laid sideways. At this time, the shaft core 42 erected on the base 41 is fitted into the hollow portion of the old belt a wound in a hollow roll shape. The major cutting blade 1 is pushed into the rubber material part of the old belt a, and the minor belt b is pulled out while pulling the minor belt b and rotating the turntable 2. The pulling out of the small belt b is performed by pulling the used cord e by a take-up pulley 6 described later in detail.
[0028]
Since the split belt b is pulled out with its width direction being vertical, the width direction is reversed horizontally by the guide rolls 10, 11 and sent to the splitting process 32. In the splitting process 32, a necessary number of the cut blades 3 are pushed in according to the number of steel cords of the split belt b, and cut in the length direction of the split belt b to be divided into single core cords c.
[0029]
The plurality of single core cords c are spread at a predetermined interval by the guide roll 12 and sent to the strip process 33. The single core belt c is forcibly passed through the strip die 4 to separate the used cord e and the rubber material d. The rubber material d is taken up by the conveyor 5 and the used cord e is taken up by the take-up drum 7 via the take-up pulley 6.
[0030]
The procedure for separating the single-core belt c into the used cord e and the rubber material d by the strip die 4 is as follows. First, the upper die 21 is lifted by the hydraulic cylinder 23 and the lower end thereof is pulled higher than the upper surface height H of the single-core belt c. In this state, the frame 24 is moved to a position where the central portion of the strip die 4 is at the position B, that is, a position where the entire strip die 4 is separated from a position (A) where the single core belt c is guided. Subsequently, the single core belt c is pulled into a predetermined position (A), and the used cord e is wound around the winding drum 7 via the pulling pulley 6 (see FIG. 2). The frame 24 is moved until the center portion of the strip die 4 reaches the position A of the single core belt c, and the upper die 21 is gradually lowered while the single core belt c is slowly pulled by the take-up pulley 6, and the rubber material d The lower die of the upper die 21 is lowered to a position L where it contacts the lower die 22 and is pressurized. Subsequently, the sheet is taken up at a normal speed and the separation process is performed until the end of the single-core belt c.
[0031]
Since the cutting knife 25 is attached to the strip die 4, the rubber material d is smoothly separated in the separation process. Further, the strip die 4 is heated to 100 to 150 ° C. to facilitate the separation process.
[0032]
【The invention's effect】
As is apparent from the above description, the method and apparatus for treating a used ST conveyor belt of the present invention have the following excellent effects. In the processing method according to claim 1, it is necessary to divide the used ST conveyor belt having a number of steel cords into single-core belts and then to separate the steel cord portions of the old belt by separating the strips through a strip die. Cutting blades can be used for a long period of time, and after being separated, steel cords can be recycled as steel cords and rubber materials can be recycled as rubber materials, resulting from incineration and landfilling The problem of environmental pollution can be solved.
[0033]
In the processing method according to claim 2, the strip die can be processed with a small number by dividing the old wide belt into a small belt and then splitting it into a single core belt. It can be easily processed even in small and small amounts.
[0034]
According to the third aspect of the present invention, since the rubber material can be heated and softened and separated by heating the strip die, the tension required for drawing can be reduced.
[0035]
The processing apparatus according to claim 4 is suitably used for carrying out the processing method according to claims 1 to 3.
[0036]
In the processing apparatus according to the fifth aspect, the single-core belt can be easily guided when starting the separation process by allowing the strip die to be divided into a plurality of pieces.
[0037]
In the processing apparatus according to the sixth aspect, by providing the incision knife, the rubber material is smoothly incised, and the rubber material to be separated can be continuously and smoothly separated without becoming a lump.
[0038]
The processing apparatus according to claim 7 can easily carry out the processing method according to claim 3 by providing the strip die with heating means.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment according to a processing apparatus of the present invention, and shows an outline of a state where an old belt a is separated.
FIG. 2 is a front view showing the apparatus of FIG. 1;
FIG. 3 is a cross-sectional view in the width direction of an ST conveyor belt subject to a processing method according to the present invention, FIG. 3 (a) is a full-width cross-sectional view with a part omitted, and FIG. FIG. 3C is a sectional view showing the single core belt c.
FIG. 4 is a partially enlarged view showing a strip die 4 according to the processing apparatus of the present invention, FIG. 4 (a) is a left side view, FIG. 4 (b) is a front view thereof, and a state where a single core belt c is passed. Represents.
[Explanation of symbols]
1: Major cutting blade 3: Small cutting blade 4: Strip die 6: Pulling pulley 7: Winding drum 8: Belt fixing band 15: Cover rubber 16: Steel cord 24: Frame 25: Cutting knife 26: Heater 31: Major process 32: Small process 33: Strip process 34: Winding process 36: Belt feeding means 37: Small cutting means a: Old belt b: Small belt c: Single core belt d: Rubber material e: Used steel code

Claims (7)

After cutting the used ST conveyor belt into a single core belt having a single steel cord by cutting it into long strips, the steel cord and rubber material are passed through a strip die. A method for treating a used ST conveyor belt, characterized in that it is separated into two. The used ST conveyor belt can be used in two steps: a large cutting process for cutting a small number of steel cords into a small belt having a plurality of steel cords, and a splitting process for dividing the small belt into the single core belt. The processing method of the ST conveyor belt according to claim 1, wherein a finished ST conveyor belt is cut into a single core belt. The processing method of the used ST conveyor belt of Claim 1 or 2 which isolate | separates the said steel cord and the said rubber material in the state which heated the said strip die at 100-150 degreeC. A large cut blade for cutting a used ST conveyor belt into a small belt having a small number of multiple steel cords, and attaching the large cut blade to a rotating shaft so as to be able to approach and separate from the used ST conveyor belt. Belt feeding means for rotatably supporting;
A slit cutting means for cutting the slit belt into a single core belt having a single steel cord, a strip die for separating the split single core belt into a rubber material and a steel cord, and rubber An ST conveyor belt processing apparatus, comprising: take-up means for winding the steel cord from which the material is separated. 5. The processing apparatus for an ST conveyor belt according to claim 4, wherein the strip dies can be divided into a plurality of pieces. The processing apparatus for an ST conveyor belt according to claim 4 or 5, wherein a cutting knife is attached to the upstream end of the strip die in the steel cord moving direction. The processing apparatus for an ST conveyor belt according to any one of claims 4 to 6, wherein the strip die has a heating means.

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