JPS60184497A - Filter cloth belt of belt press type dehydrator - Google Patents

Abstract

PURPOSE:To improve wear resistance by forming the filter cloth which contacts with a slurry into the satin weave in which the warp on the surface of the filter cloth is floated long and the weft on the rear to contact with rollers is projected to the outside of the warp. CONSTITUTION:Only the warp 9 is floated long on the surface S to contact with a slurry of a filter cloth A woven to the single-ply woven structure of the satin weave consisting of the warp 9 and the weft 10. The rear surface S' to contact with rollers 5, etc. is woven to the structure in which the weft 10 floats long from the warp 9. The warp 9 is bound by another structure in the binding part of the warp in the joint part formed by the warp 9 so as to correspond with the structure of the belt body.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a furnace cloth belt for a belt press type dewatering device, and an object of the present invention is to provide a furnace cloth belt that has superior durability and can be used for a longer life than conventional belts.

As shown in Figure 1, the belt press type dehydrator uses two endless furnace cloth belts A and B, and in the pressurized dehydration section l, sludge such as sludge is sandwiched between the two furnace cloth belts. (The type that performs pressurized dehydration in
There are devices that perform pressurized dewatering using only A, but in all cases, a straight belt of one furnace cloth belt A is provided in front of the pressurized dewatering section L, onto which slurry such as sludge is supplied. The cake is dehydrated by gravity while traveling on this straight band, and then subjected to a pressurized dehydration session in a pressurized dehydration section, and then dehydrated and peeled off from the cake tF fabric belt with a scraper 3, and the QI/iF fabric belt is ) shows a drive roller that is driven to rotate in the direction of the arrow. The pressurizing force in the pressurized dewatering section of this dewatering device increases in proportion to the amount of tension applied to the furnace cloth belt by the tension roller S, so in order to increase the solid content concentration of the dehydrated cake, the pressure applied to the furnace cloth belt increases. It is necessary to increase the tension given.

When the oven cloth 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 that circulates the F-belt.

The maximum tension during operation can be understood as a function that changes in relation to the circulation speed of the furnace cloth belt, the amount of slurry supplied, the increase in the solid content 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 3 (usually 3 to 10 b/cm) is multiplied by g-3,θ, and the circulation speed of the furnace cloth belt varies greatly depending on the properties of the slurry used. The faster the slurry load increases, the more the slurry load increases.

When the maximum tension during operation becomes large, the frictional resistance between the roller and the back surface of the furnace cloth belt that runs in contact with it increases, so that the abrasive substances in the slurry are interposed between them. The degree of ablation wear caused by this increases, and the strength of the nose surface of the furnace cloth belt decreases rapidly, shortening its useful life. Because the belt is endless, the metal staples, usually stainless steel, that connect the ends of the furnace cloth belt are subject to wear and tear.

That is, the furnace cloth belts currently in use generally have a diameter of 0.
The warp and weft of 2~/0 earthquake polyester monofilament are woven with plain weave, twill weave and satin weave, stainless steel staples (also known as hooks) are attached to each longitudinal end, and the staples are connected in a hinged manner using stainless steel or plastic. The original strength at break of the furnace cloth belt is /30-X) OKg/cm, the original strength at break of the joint is 40-EOKy/cm, and the maximum tension during operation is approximately 5~ Although it has 10 times the safety level, the strength of the furnace cloth belt and stainless steel extension table rapidly decreases due to the above-mentioned abrasion wear, and the endless joints come apart due to breakage of the stays and pulls, making the furnace cloth belt unusable. be in an impossible state.

Considering the decrease in strength of the furnace cloth belt due to abrasion wear, the conventional furnace cloth belt has only one of the warp threads t and weft threads 7 that make up the belt, or the surface S that comes into contact with the slurry, as shown in Figure 3. In addition, it partially protrudes onto the back surface S' of the belt that runs in contact with each roller.

Is this warp thread tensioned with a tension roller? In addition to the maximum tension applied during operation, if the portions 6' of the warp threads protruding from the back surface of the belt are worn out due to abrasion wear, this is directly related to the strength of the belt and causes 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 kiln cloth belt that comes into contact with the slurry has the warp threads floating long enough to have intertwining points with the weft threads. The above-mentioned problems have been solved by the change organization. Even if the furnace cloth belt is organized in this way, if the ends of the furnace cloth belt are joined with staples as in the past, the staples will be worn out and the joints will come off, so the long side of the furnace cloth belt At each end of the direction, a part of the warp threads is folded back and bound), and the folded parts of the warp threads form a loop protruding from each end, and all the loops of the other end are inserted into the adjacent gap between the loops at one end. It is preferable to adopt an intermittent warp loop seam in which a metal or plastic wire is passed through the plunger, aligned with the entire loop of each end, and joined endlessly to prevent wear of the joint.

Next, the present invention will be explained with reference to the drawings. FIG. 4 shows an example of a furnace cloth belt woven according to the present invention, (α) is its organization diagram, (b) is an enlarged cross-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 diameter of the warp 9 is smaller than that of the weft 10, for example, the diameter of the warp is o-5tan, and the diameter of the weft is o-5tan. The diameter of is o, g.

In this embodiment, each warp yarn crosses over seven adjacent weft yarns io... on the light side S of the furnace cloth belt, passes under the weft yarn 10α of the 8th grain, and returns to the next seven weft yarns. (Figure 4b).

Next, the weft threads /θa, /θb, toe, and 10f go under the warp thread 9 by IO0, cross over the 71st sheath, and go under the warp thread 9 by 1+ warp threads again, and repeat this process (as shown in the y-y cross-sectional view). show). In addition, the weft threads /θC110d, /θg, and 10h pass under the warp threads t at different positions for 8 times, cross over the 9th grain, and then pass under the 6 lower threads of the warp threads again, repeating this process (
(No cross section).

In other words, the entire length of the furnace cloth belt of this embodiment is woven with an 8-ply satin structure in which 8-ply satin sheets are alternately arranged in 3 and 5 steps.

As a result, each weft thread 10 is exposed on the surface S of the kiln cloth belt at a portion 70' where the warp threads D go under it, but it is the warp threads that mainly constitute the surface S'4. It is.

In addition, the warp threads 9 are the part that goes under the weft threads, and the back side S of the furnace cloth belt is
However, as mentioned above, the warp threads are smaller in diameter than the weft threads, so they are retracted from the back side and do not protrude, and the back side s't-
It is mainly composed of weft threads. In addition, it is preferable to weave with a high warp density, that is, to lift up the weft with the warp passing under the weft, thereby increasing the protrusion of the weft on the back surface.

Therefore, each end is joined and the furnace cloth bell) Th
When the belt is stretched and installed in ff1i operation, the warp threads exposed on the back side of the furnace cloth belt are retracted from the back side and do not come into contact with the surface of the roller, so they do not wear out due to abrasion wear, and it is the furnace cloth that wears out. Since the weft threads have little effect on the strength in the longitudinal direction of the belt, the lifespan of the kiln cloth belt itself is 3 to S times longer than that of conventional belts in which the warp threads suffer from abrasion wear.

Next, I will explain how to make a joint for a hearth cloth belt.In general, the method of extending the warp yarn of the fabric body, folding it back to create a loop, and sewing the end of the yarn into the body according to the texture of the fabric was introduced in the 5th century. -1lt, AG3, etc., but 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, symbols α, b, c...p indicate the 76 warp threads that completely form one unit joint, and these are woven slightly longer than the required length of the kiln cloth belt, and the weft threads are removed to make only the warp threads. do. Symbols /, ko...A41 indicate each weft thread existing between the lengths of the joint portions.

A metal wire w2 of a thickness corresponding to the size of the splicing loop is provided on the right side of the most pointed weft forest, and the entire warp is made to go around it and then folded and tied 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 the warp threads of adjacent q-threads as a set, seven joining loops and a weft presser to keep the endmost weft threads from 6 to 70 degrees will be created.

In Figures 6 to 9, 9A is an extended warp for loop formation, and 9B is a short warp. C is a warp for weft pressing, and 9D is a short warp.

9A has the same structure as the main body from the end to the first weft A3, and at the intersection with the first weft 61, the structure is completely changed so that it passes through the back side of the hearth cloth belt.

Next, move to the front side of the belt and insert the loop making wire w'
Turn around once to form a bonding loop 12.

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 6da, and emerges from the surface of the belt.

After appearing on the back side of the weft thread 40, the weft thread is wound up to the weft λ edge using the same structure as the main body, and the weft thread S1λ6 is weaved, and the excess yarn end is cut off at the part that appears on the back side of the weft thread body. □Short meridian 9
B has the same weave as the main body up to the weft body, with weft 2g and C9, and is cut at the part that comes out on the back side of weft 3θ.

The warp 9C for weft pressing in Fig. 8 is the first weft A4I-/l.
- has the same structure as the main body, the M1 weft A4I goes around from the front to the back, and moves on the same line as the adjacent short warp 9D.

The warp that passes through the back side of the first weft 61 and the second weft 63 and emerges from the surface of the fabric? C is transferred to the back side of the weft Stt, and then stitched up to the weft G/ in the same structure as the main body.

Next, the weft threads θ and 39 are weaved, and cut at the part that appears on the back side of the weft threads 3g. Short warp? D (Fig. 9) is the same structure as the main body, and is cut on the back side of Hiroko using the weft &/7.

As mentioned above, the four warp threads have been described, but the weaving structure of this furnace cloth belt is 76 warp threads and 8 weft threads (one repetition unit), or for joints, the warp threads are processed as a total of 6 warps per unit. All the loops are made, but for the weft, the positions where the warp passes through the weft are varied to prevent them from aligning on a single line and to maintain strength, the AJ threads are set as one unit and correspond to the warp. Since the main body structure is irregular, the structure at the joint can only be created by making the structure different from the main body structure.

Once the jointing process is completed for each of the belts, all rows of metal wires are cut 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 endlessly join the furnace cloth bell.

The joint between the group of loops 72 and the wire rod 13 does not protrude from both the front and back sides of the furnace cloth belt, unlike conventional stables, and therefore does not cause abrasion wear.

Therefore, the strength of the furnace cloth belt decreases and the bonded state is maintained until the end of its life.Next, the results of a comparative test of wear resistance are shown.

Polyester monofilament with a diameter of OJ m for the warp,
Using a polyester monofilament with a diameter of 0.8 gourd for the weft, weave a hearth cloth belt with the 8-ply satin weave shown in Figure 4, cut it into a total length of 3 (7), and cut two sheets into a conventional stainless steel belt. The other two sheets were joined with a stable to form a sample (1), and the other two sheets were formed into a loop with one of the four adjacent warp yarns as shown in Figures 6 to 9, and all the loops had a diameter of approximately To S
A sample (■) was obtained by passing a polyester wire rod of 50 m in diameter through the wire, melting both ends of the wire with a heat mirror 73-, spreading it out into a brim shape, and joining it so that it would not come off.

In addition, there is a conventional furnace cloth belt'f: ! ; Cut to cm,
The two sheets were joined together using a stainless steel stable to form a sample (G).

Each sample was subjected to a continuous furnace cloth running belt press tester.
While immersed in the abrasive dispersion (silica sand jwt%),
The vehicle was operated at Kf/crn and a running speed of 10 m for 7 minutes.

Original strength Time to rupture Remaining strength sample (I) 9 ri (X clear /3, 7 hours (stable failure) - Sample (II) k II b/cm l!; 0
No damage after hours '12b/cm sample (1) J It
4/, 10! ;, 8 hours (stable breakage) - Compared to sample (g), which is a conventional furnace cloth belt, sample (1) with the woven structure of the present invention can be used for a long time; sample (I
It was found that I) could be used for a longer period of time.

As described above, the present invention can provide a furnace cloth belt having excellent wear resistance under high tension service conditions. The woven structure is not limited to the 8-ply modified satin structure shown in the example, but may be any other suitable structure.

[Brief explanation of the drawing]

Figures 1 and 2 are side views showing two examples of a belt press type furnace filtration device, Figure 3 is an enlarged longitudinal sectional side view of a conventional furnace cloth belt,
FIG. 4(, 1L) is an organization chart of the present invention, FIG. 4(b) is an enlarged longitudinal cross-sectional side view of one embodiment of the furnace cloth belt of the present invention, and FIG. 4(C) is an enlarged longitudinal cross-sectional view of the same in the width direction. 5 is an explanatory view showing a state in which the weft yarns at each end are removed in order to fully join both ends of a woven hearth cloth belt, and FIGS. 6 to 9 are cross-sectional views in the warp direction, respectively. Book warp 9A, 9B,? C,,? 9A is a diagram showing the procedure for creating one joint loop using D.
, a loop is created with 9B or n9C. Form a weft presser at 9D. In the figure, A and B are the furnace cloth belts, S is the front surface, B/ is the back surface, 9 is the warp, and io is the entire weft.

Claims (1)

[Scope of Claims] (1) In a furnace cloth belt of a belt press type dewatering device, the warp and weft are woven into a single weave structure of satin weave, and the joints are made by loops formed by the main body warp. On the surface that comes in contact, only the warp threads are long and floating, and on the back surface that contacts the rollers, the weft threads are long and stand out from the warp threads.The warp threads at the joint part are sewn separately to correspond to the structure of the belt body. A furnace cloth belt for a belt press type dewatering device, characterized in that it is composed of a structure of. (2. The furnace cloth belt according to claim 1, wherein the fabric structure of the belt is made of irregular 8-ply satin in which 8-ply satin is alternately arranged in 3 and 5 rows. 2-(3) The furnace cloth belt according to claim 1 or 2, wherein the warp and weft are made of synthetic resin monofilament.