JPS628280B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a cloth belt for a belt press type dewatering device, and an object of the present invention is to provide a cloth belt that is more durable than conventional belts and can be used for a long time. As shown in Figure 1, the belt press type dewatering device uses two endless cloth belts A and B, and in the pressurized dewatering section 1, slurry such as sludge is sandwiched between both cloth belts and pressurized and dehydrated. As shown in Fig. 2, there are models that perform pressurized dehydration using only one endless cloth belt A, but in all cases, a single cloth belt A is installed in front of the pressurized dewatering section 1. Slurry such as sludge is supplied onto the straight-travel zone 2, and gravity dewatering is carried out while traveling on this straight-travel zone.Next, pressurized dewatering is performed in the pressurized dewatering section 1, and then the dehydrated cake is passed through a cloth belt. Since it is peeled off with a scraper 3,
Reference numeral 4 indicates a drive roller that is driven to rotate in the direction of the arrow in order to circulate the cloth belt. The pressurizing force in the pressurized dewatering section 1 of this dewatering device increases in proportion to the amount of tension applied to the cloth belt by the tension roller 5, so in order to increase the solid content concentration of the dehydrated cake, the tension applied to the cloth belt is increased. needs to be made larger. When the fabric belt is operated with tension applied in this manner, the maximum tension (hereinafter also referred to as maximum tension during operation) is generated in a portion near the tension side of the drive roller 4 that circulates the fabric belt. The maximum tension during operation is understood as a function that changes in relation to the circulation speed of the cloth belt, the amount of slurry supplied, the increase in the solids concentration of the slurry, etc., and its magnitude is determined by the operating conditions and the amount of supplied slurry. The tension applied by the tension roller 5 (usually 3~
10Kg/cm), and increases as the circulation speed of the cloth belt increases and as the slurry load increases. When the maximum tension during operation becomes large, the frictional resistance between each roller and the back surface of the cloth belt that runs in contact with it becomes large, so abrasive substances in the slurry become interposed between them. The degree of abrasion wear increases, and the strength of the back side of the cloth belt rapidly decreases, shortening its useful life.In order to make the cloth belt endless, the metal used to connect both ends of the cloth belt, usually made of stainless steel. Wear and consumption of manufactured staples is accelerated. In other words, the cloth belts currently in use generally have a diameter of 0.2 to 1.0 mm.
The warp and weft of polyester monofilament are woven in plain weave, twill weave, and satin weave, with stainless steel staples (also known as hooks) at each longitudinal end.
The staples are connected in a hinged manner with stainless steel or plastic wire to make it endless, and the original breaking strength of the cloth belt is 130 to 200 kg/
cm, the original breaking strength of the joint is 60 to 80 kg/cm, which is about 5 to 10 times the safety level of the maximum tension during operation, but the strength of cloth belts and stainless steel staples decreases rapidly due to the abrasion wear mentioned above. In particular, due to staple breakage, the endless joints may become detached.
The cloth belt becomes unusable. Considering the decrease in strength of cloth belts due to abrasion wear, conventional cloth belts are
As shown in the figure, in addition to the surface S where the warp threads 6 of the warp threads 6 and weft threads 7 that make up the belt come into contact with the slurry,
It partially protrudes from the back surface S' of the belt that runs in contact with each roller. These warp threads are tensioned by tension rollers, and maximum tension is applied during operation, so the warp threads are
When the protruding portion 6' on the back surface of the cloth belt is worn out due to abrasion wear, it is directly related to the strength of the cloth belt, resulting in a decrease in strength. Also, since the staples 8 protrude on the front and back sides of the belt at each end of the belt, abrasion wear occurs and breaks from the exposed portions 8' on the back side of the belt. Therefore, in the present invention, the surface of the cloth belt that comes into contact with the slurry has warp yarns floating long and dotted with intertwining points with the weft yarns, and the back surface opposite to the front surface has a satin weave or a variation thereof in which the weft yarns protrude outside the warp yarns. This solves the above problem. Even if the cloth belt is organized in this way, if the ends of the cloth belt are joined with staples as in the past, the staples will wear out and the joint will come off, so each end of the cloth belt in the longitudinal direction Some of the warp threads are folded back and tied together, and the folded parts of the warp threads form loops protruding from each end. It is preferable to employ a so-called warp loop seam in which a series of loops are aligned and a metal or plastic wire is passed through the loops to join them endlessly to prevent wear at the joints. Next, the present invention will be explained with reference to the drawings. FIG. 4 shows an example of a cloth belt woven according to the present invention, in which a is a tissue diagram, b is an enlarged sectional view in the longitudinal direction X-X', and c is a cross-sectional view in the width direction Y-
It is an enlarged sectional view of Y'. The warp 9 and the weft 10 are both polyester monofilament, or the warp is polyester and the weft is nylon monofilament, but the warp 9 has a smaller diameter than the weft 10, for example, the warp has a diameter of 0.5 mm and the weft has a diameter of 0.5 mm. It is 0.8mm. In this embodiment, each warp thread 9 crosses over seven adjacent weft threads 10 on the surface side S of the fabric belt 1, passes under the eighth weft thread 10a, and then crosses over the next seven weft threads. across the top (Fig. 4b). Then weft threads 10a, 10b, 10e, 10
f goes under 10 warp threads 9, crosses over the 11th warp thread, dives under 4 warp threads 9 again, and repeats this process (Y
-Y cross-sectional view). In addition, the wefts 10c, 10d,
10g and 10h pass under 8 warp threads 9 at different positions, cross over the 9th warp thread, pass under 6 warp threads 9 again, and repeat this process (no cross-sectional diagram). In other words, the total length of the cloth belt in this example is 3
It is woven with an 8-ply satin structure that alternates 8-ply satin sheets with 5 jumps. As a result, each weft thread 10 is exposed on the surface S of the fabric belt at a portion 10' under which the warp threads 9 pass, but it is the warp threads 9 that mainly constitute the surface S. In addition, the warp threads 9 are exposed on the back side S' of the cloth belt at the part that goes under the weft threads, but as mentioned above, the warp threads have a smaller straight warp than the weft threads, so they are retracted from the back side and do not protrude, and the warp threads 9 are exposed on the back side S'. It is mainly composed of weft threads.
In addition, weaving with a high warp density means that
It is preferable to weave by increasing the protrusion of the weft yarns on the back side by lifting the warp yarns with the warp yarns that go under the weft yarns. Therefore, when each end is joined and the cloth belt is stretched so that the back side S' runs in contact with the roller of the belt press type dewatering device and the device is operated, the warp threads exposed on the back side of the cloth belt are Since the part is retracted from the back side and does not come into contact with the surface of the roller, it will not wear out due to abrasion wear, and since it is the weft that is worn, which has little effect on the longitudinal strength of the fabric belt, it will cause a decrease in strength. The cloth belt itself runs out when it can no longer be used.The lifespan of the conventional belt is about 3-5.
It's twice as long. Next, to explain how to make a joint for a cloth belt, the general method is to extend the threads in the warp direction of the fabric body, fold them back to create a loop, and then tuck the ends of the threads into the body according to the ground texture, as disclosed in Publication No. 51-46483. However, in the present invention, the structure of the main body and the structure of the joint are made different to achieve the desired effect. In Fig. 5, the symbols a, b, c...p indicate 16 warp threads forming one unit joint, which are woven slightly longer than the required length of the cloth belt, and the weft threads are pulled out to leave only the warp threads. shall be. Symbols 1, 2...
. . . 64 indicates each weft yarn existing between the lengths of the joint portions. A metal wire W having a thickness corresponding to the size of the splicing loop is provided on the right side of the most pointed weft 64, and the warp is wound around this and folded back to the end of the main body. This method is broken down and a portion thereof is illustrated in FIGS. 6 to 9. By using four adjacent warp threads as a set, one joining loop and one weft presser to prevent the endmost weft thread 64 from coming off are created. In FIGS. 6 to 9, 9A is an extended warp for loop formation, 9B is a short warp, 9C is a warp for holding the weft, and 9D is a short warp. 9A has the same structure as the main body from the end to the second weft 63, and at the intersection with the first weft 64, the structure is changed so that it passes through the back side of the cloth belt. Then, moving to the front side of the belt, the loop-making wire W is wound around to form a joining loop I. Then, the folded warp thread 9A shifts to FIG. 7, moves on the same line as the adjacent second warp thread 9B, passes through the back side of the first weft thread 64, and emerges from the surface of the belt. Weft 6
After appearing on the back side of 0, weft 27 with the same structure as the main body.
The weft threads 25 and 26 are sewn in until the weft threads 25 and 26 are weaved, and the excess thread end is cut off at the part that comes out on the back side of the weft thread 24.
The short warp 9B is woven with the wefts 28 and 29 in the same structure as the main body up to the weft 27, and cut at the part where the weft 30 comes out on the back side. The weft holding warp 9C in FIG. 8 has the same structure as the main body up to the first weft 64, goes around the first weft 64 from the front to the back, and moves on the same line as the adjacent short warp 9D. The warp threads 9C passing through the back sides of the first weft threads 64 and the second weft threads 63 and appearing on the surface of the fabric move to the back side of the weft threads 58 and are then wound up to the weft threads 41 in the same structure as the main body. Next, it is woven together with the weft yarns 40 and 39, and cut at the portion that appears on the back side of the weft yarn 38. The short warp 9D (FIG. 9) has the same structure as the main body up to the weft 41, and is cut after coming out from the back side of the weft 42. As mentioned above, the four warp threads are described above, and the weaving structure of this cloth belt is 16 warp threads and 8 weft threads, making one repetition (unit).However, for joints, 16 warp threads are treated as one unit, and loops are formed. However, regarding the weft threads, in order to vary the positions where the warp threads pass through the weft threads and prevent them from aligning on a single line, and to provide strength, 64 threads are made into one unit and correspond to the warp threads mentioned above. Since the main body structure is an irregular structure, the structure at the joint can only be created by making the structure different from the main body structure. After completing the joining process for the entire width of the belt, the metal wire is pulled out, the loops at both ends of the belt are interlocked, and a series of wires are passed through the loops, thereby making it possible to join the cloth belt endlessly. The joint between the group of loops 12 and the wire rod 13 does not protrude from both the front and back surfaces of the cloth belt unlike conventional staples, and therefore does not cause abrasion wear. Therefore,
The bonded state is maintained until the strength of the cloth belt decreases and its life ends. Next, the results of a comparative test of wear resistance are shown.
Using a polyester monofilament with a direct warp of 0.5 mm for the warp and a polyester monofilament with a diameter of 0.8 mm for the weft, a cloth belt was woven with the 8-ply satin weave shown in Figure 4, and this was cut into 5 cm lengths. Two sheets were joined with conventional stainless steel staples to form a sample (), and the other two sheets were each formed into a loop with one of the four adjacent warp threads as shown in Figures 6 to 9. A polyester wire rod with a diameter of approximately 1.5 mm was passed through the entire loop, and both ends of the wire were melted with a hot trowel, expanded into a brim shape, and joined together to prevent them from coming off to form a sample (). In addition, a sample () was prepared by cutting a conventional cloth belt into 5cm pieces and joining the two pieces with stainless steel staples.
And so. Each sample was subjected to a continuous cloth running type belt press test machine and operated at a tension of 20 kg/cm and a running speed of 10 m/min while being immersed in an abrasive dispersion liquid (silica sand 5wt%).

[Table] Compared to the sample (), which is a conventional cloth belt, the sample () with the woven structure of the present invention can be used for a long time. It was found that sample (2) could be used for a longer period of time. Thus, the present invention can provide a fabric belt that has excellent abrasion resistance under high tension and service conditions. The woven structure is not limited to the 8-ply satin structure shown in the embodiment, but may be any other suitable structure.

[Brief explanation of the drawing]

1 and 2 are side views showing two examples of belt press molding devices, FIG. 3 is an enlarged longitudinal sectional side view of a conventional cloth belt, and FIG.
FIG. 4c is an enlarged longitudinal sectional view of an embodiment of the fabric belt of the present invention, and FIG. 4c is an enlarged longitudinal sectional view of the same in the width direction.
FIG. 5 is an explanatory diagram showing a state in which the weft threads at each end are removed in order to join both ends of a woven cloth belt;
Figures 6 to 9 are cross-sectional views in the warp direction, showing the procedure for creating one joint loop using four warps 9A, 9B, 9C, and 9D.
A loop is created at 9C and 9D, and a weft presser is formed at 9C and 9D. In the figure, A and B are cloth belts, S is the surface thereof,
S' indicates the back surface, 9 indicates the warp, and 10 indicates the weft.

Claims (1)

[Scope of Claims] 1. In a cloth belt for a belt press type dewatering device in which the warp and weft are woven into a single weave structure of satin weave, and the joint is created by a loop formed by the main body warp, the surface that comes into contact with the slurry is Only the warp threads are long and floating, and the back side that contacts the rollers is structured so that the weft threads are long and stand out from the warp threads.The warp threads at the joint are sewn with a different structure to match the structure of the belt body. A cloth belt for a belt press type dewatering device, which is characterized by being composed of multiple layers. 2. The cloth belt according to claim 1, characterized in that the fabric structure of the belt is made of irregular 8-ply satin in which 8-ply satin is alternately arranged in 3-5 jumps. 3. The fabric belt according to claim 1 or 2, wherein the warp and weft are synthetic resin monofilament.