CN115501699A - Dust removal filter bag with inner plugging pin hole - Google Patents

Abstract

The technical scheme provides an interior shutoff pinhole dust bag. The dust removal device is mainly characterized in that a sealing cover layer (7) for plugging pin holes is arranged on the inner side of the filter bag partially or completely for pin holes (12) of the filter bag in a filter area, so that the purpose of plugging the existing cloth seams (15) and pin holes (12) dust leakage channels is achieved, and the dust removal efficiency is improved.

Description

Dust removal filter bag with inner plugging pin hole

Technical Field

The invention relates to a dust removal filter bag for blocking a sewing needle hole on the inner side of the filter bag, and belongs to the field of environment-friendly bag type dust removal.

Background

The core component used in the bag type dust collector, namely the filter bag, is generally formed by connecting a bag body filter material (4), an expansion ring wrapping cloth (3), a bag bottom cloth (13) and a reinforcing layer cloth (8) by a plurality of cloth materials. Except that a few varieties of filter materials and a few parts can be connected by hot melting, the plurality of cloth materials are connected by sewing. And the connection parts are all arranged in the filtering area, and four dust leakage channels are formed by the cloth seams (15) and the needle holes (12) generated by sewing connection, such as (1) - (1) to (4) - (4) shown in figure 3, so that the dust removal efficiency is greatly influenced. In order to further improve the dust removal efficiency of bag house dust collectors, the development direction in recent years mainly focuses on two aspects: on one hand, the research and development result is remarkable when the filter material with higher dust removal efficiency, such as superfine fiber, PTFE membrane and the like, is researched and developed, and the product is generally applied in industry. Through a large amount of dynamic monitoring, the discharge concentration of the general membrane filter material can be less than or equal to 0.1mg/Nm & lt 3 & gt under most working conditions. On the other hand, the dust leakage caused by cloth seams (15) and pinholes (12) generated in the process of manufacturing filter bags by using filter materials is researched and developed. Firstly, as shown in fig. 2 and 4, the cloth seam (15) and the needle hole (12) are closed together by using the PTFE seal (11), but the seal (11) is broken after being used for a certain period of time due to the fatigue failure effect of the expansion and contraction force, and the effect of closing the cloth seam (15) cannot be achieved. Moreover, because the PTFE seal (11) can not be pasted at the bottom part of the bag, the product of pasting the seal (11) at the cloth seam (15) at the bottom of the bag is not available at present. Secondly, as shown in fig. 2 and fig. 5, the sealing glue (6) is used for coating and blocking the side seams of the cloth seams (15) and the outer surfaces of the pinholes (12), but the glue coated at the side seams of the cloth seams (15) is easy to crack during ash removal and blowback, and the cloth seams (15) at a plurality of positions are difficult to coat, so that the production efficiency is influenced and the reliable blocking cannot be realized if the glue is coated to a certain extent. Thus, current products generally do not have the coating slit (15) and only have the surface pinholes (12) as shown in fig. 6.

Disclosure of Invention

The technology of the scheme is based on the connection scheme of a bag body filter material (4), an expansion ring (1), a clamping strip (2), a bag bottom cloth (13), an expansion ring wrapping cloth (3) and a reinforcing layer cloth (8) in the prior art (namely no matter a flat bag or a folded bag, the sewing connection part of the expansion ring wrapping cloth (3) wrapped with the expansion ring (1) and the clamping strip (2) and the bag body filter material (4) is in a filtering area, the bag bottom cloth (13) and the bottom end of the bag body filter material (4) and the reinforcing layer cloth (8) on the bag bottom are sewn to form a traditional process model of the bag bottom, as shown in a figure 1), and the sewing connection part of the expansion ring wrapping cloth (3) wrapped with the clamping strip (2) and the bag body filter material (4) is in an air purifying chamber area, the bag bottom is a new process model of a buckle form by using a buckle (9), as shown in the figure 9, a sealing covering layer for partially or completely arranging the sealing pinholes (12) on the inner side of a filter bag hole (12) in the filtering area, so as to achieve the purpose of sealing a cloth seam (15) and a dust leakage channel of the cloth (12). And the scheme does not have the problem that the edge sealant (6) or the seal (11) of the cloth seam (15) is easy to crack in the folding, transportation, installation and use (blowing and dust removal) of the filter bag.

The sealing cover layer can be an inner coating sealant (7) or an inner application seal (11). The type and the smearing method of the sealant (7) are the same as those of the existing process of coating glue on the outer side; the seal may be a PTFE seal (11) having the same properties, specifications and application method as the prior art process for applying the PTFE seal (11) on the outside.

When the process of internally coating the sealant (7) is adopted, the protective film (14) is covered on the surface of the undried glue mark while the sealant is coated. Because the sealant (7) needs a period of time for completely drying, generally 12-48 hours, the protective film (14) can prevent the sealant (7) which is not completely dried from falling off and losing efficacy, and even the inside of the filter bag is stuck to cause the filter bag to be unusable. The process for covering the protective film is used in the gluing production of the front side of the middle seam, and the method is simple and reliable. Aiming at the technology of the scheme, special patent equipment is required to be used for production, and the production line equipment in the prior art is technically improved and upgraded. The protective film (14) can be made of various materials which do not penetrate through the sealant, such as polyethylene, polyvinyl chloride, polyvinylidene chloride, polytetrafluoroethylene, thin paper strips and the like. If the working condition is bad, the protective film (14) can be made of a material which can volatilize and extinguish under the working condition of the filter bag, but the volatilization and extinguishment process does not produce secondary pollution.

As shown in fig. 3, although the weight of dust leakage of the channels (3) - (3), i.e. the pure cloth seam channels, is extremely low, in order to be able to block the channels under the working conditions that the dust particle size is extremely fine or the requirement on the filtering precision is extremely high, the sealant (10) can be coated between the two surfaces of the two layers of filter materials which are integrally sewn, i.e. the channels (3) - (3) and between any two rows of sewing stitches, as shown in fig. 2 and fig. 8. For the cloth seam (15) of the middle seam, sealant (10) can be coated between any two sewing stitches and at the cloth seam (15) part between the outer overlapped filter material (4-a) and the inner overlapped filter material (4-b) so as to block the leakage of dust at the pure cloth seam. The sealant can not contact the sewing thread (5) and the needle hole (12) so as to ensure that the phenomenon of thread jumping of the sewing process can not be caused, and special patent equipment is required for production, so that the quality and the production efficiency are ensured.

Further, when the reinforcing layer cloth (8) is built in, as shown in fig. 9, the sealant (7) coated internally can be coated between the bag body filter material (4) and the reinforcing layer cloth (8) and close to the sewing line (5).

On the basis of any combination of the above technical solutions, any needle hole (12) in the filtering area can be sealed off from the outside, that is, a sealant (6) is applied to the needle hole (12) on the outer surface of the filter bag, or the needle hole (12) and the cloth seam (15), as shown in fig. 7, or a PTFE seal (11) is applied. I.e. to combine the prior art solutions into the present technology.

The dust industry is working on research and development, and lower emissions are desired for baghouse products. One dust removal project often has thousands or even tens of thousands of filter bags working simultaneously. According to the prior art, each filter bag has 7-10 m cloth seams (15) and thousands of needle holes (12) for leaking dust, the influence on the dust removal efficiency cannot be ignored, the technical scheme not only thoroughly solves all dust leakage channels, but also does not increase the cost, the process is basically unchanged, and the scheme is simple, practical and reliable.

Drawings

The invention is shown on page 10 of the attached drawings, and 10 sheets in total:

FIG. 1 is a schematic view of a filter bag structure and an inner and outer sealing cover layer

FIG. 2 isbase:Sub>A cross-sectional view of the thin film transistor of FIG. 1A-A

FIG. 3 is a schematic view of 4 kinds of dust leakage passages generated by sewing

FIG. 4 is a schematic view of a PTFE seal structure of the prior art with a part enlarged in FIG. 2

FIG. 5 is a schematic view of a prior art surface coating and side coating structure partially enlarged in FIG. 2

FIG. 6 is a partially enlarged view of the prior art surface-only adhesive structure of FIG. 2

FIG. 7 is a partially enlarged view of the inside and outside gluing assembly shown in FIG. 2

FIG. 8 is a partially enlarged view of FIG. 2 showing a combination structure of inner and outer side glue application and cloth seam glue application in the prior art

FIG. 9 is a schematic view of the structure of the adhesive inside the reinforcement layer of the filter bag with the bottom of the buckle bag

FIG. 10 is a schematic view showing a structure of a filter bag in embodiment 1

1-expansion ring 2-clamping strip 3-expansion ring wrapping cloth 4-bag body filter material 4 a-outer lapping filter material 4 b-inner lapping filter material 5-suture 6-outer sealant 7-inner sealant 7 a-bag opening sewing inner side sealant 7 b-bag bottom reinforcing layer inner side sealant 7 c-middle seam inner side sealant 8-reinforcing layer cloth 9-buckle 10-cloth seam middle stitch seam sealant 11-PTFE seal strip 12-needle hole 13-bag bottom cloth 14-protective film 15-cloth seam

Detailed Description

Example 1

As shown in FIG. 10, the material of the filter material is 550g/m2 terylene laminated needled felt, and the filter material is sewn into a cylindrical bag body. The same material is used for manufacturing the circular bag bottom cloth 13, the short cylindrical reinforcing layer cloth 8 and the short cylindrical expansion ring wrapping cloth 3. The expansion ring wrapping cloth 3 wraps the expansion ring 1 and the clamping strip 2, and the size, the manufacturing requirement, the connection mode and the outer side sealant 6 on the expansion ring wrapping cloth are the same as those of the prior art. And sealing glue 7a is coated on the inner side of the bag body filter material 4 corresponding to the inner surfaces of the expansion ring wrapping cloth 3 and the sewing thread 5 of the bag body filter material 4 to seal the pinholes. And (3) coating a sealant 7c on the inner wall of the middle seam 15 corresponding to the pinhole 12, and immediately pasting a protective film 14 on the adhesive surface after the adhesive is coated, wherein the protective film 14 is made of PE (polyethylene) and has the thickness of 0.03mm and the width of 40mm. The internal coating 7c of the cloth seam 15 of the center seam and the application of the protective film 14 are completed by using special patent equipment. The outer side of the bag body filter material 4 is sleeved with the reinforcing layer cloth 8, the bottom edges of the reinforcing layer cloth 8 are aligned, and then the upper edge of the reinforcing layer cloth 8 and the bag body filter material 4 are sewn into a whole. And (3) coating a sealant 7b at the position close to the upper edge sewing in a seam formed by the outer wall of the tubular bag body and the inner wall of the reinforcing layer cloth 8. The types of the sealants 7a, 7b and 7c are the same as the sealant 6 coated outside in the prior art, and the coating thickness is also the same. Finally, the bag bottom cloth 13 is sewn and connected with the lower peripheries of the bag body filter material 4 and the reinforcing layer cloth 8. Finally, coating sealing glue 6 on the outer side surface of the cylindrical bag body corresponding to the needle hole 12 generated by the sewing connection, and finishing the manufacture of the filter bag.

Claims (6)

1. The utility model provides an interior shutoff pinhole dust removal filter bag, including filter material (4), expansion ring (1), card strip (2), bag end cloth (13) or buckle (9) of making the filter bag, or sack expansion ring infantees (3) and bag end enhancement layer cloth (8) that possibly have, its characterized in that: for the sewing needle holes (12) in the filtering area, a sealing cover layer for sealing the needle holes (12) is partially or completely arranged on the inner side of the filter bag.

2. The inner-sealing pinhole dust removal filter bag according to claim 1, wherein: the sealing cover layer can be a sealing glue (7) or an application seal, and the seal can be a PTFE seal (11).

3. The inner-sealing pinhole dust removal filter bag according to claim 2, wherein: and simultaneously coating the sealant (7) and covering a protective film (14) on the surface of the undried glue mark.

4. The internally-sealed pinhole dust filter bag according to claim 3, wherein: the protective film (14) can be made of various materials which do not penetrate through sealant, such as polyethylene, polyvinyl chloride, polyvinylidene chloride, polytetrafluoroethylene, thin paper strips and the like.

5. The internally-sealed pinhole dust filter bag according to claim 1, wherein: and sealant (10) is coated between two surfaces of two layers of filter materials which are sewn into a whole and are abutted to each other, and between any two rows of sewing stitches.

6. The inner-sealing pinhole dust removal filter bag according to claims 1, 2, 3, 4 and 5, wherein: and (3) coating a sealing glue (6) or attaching a seal (11) on a pinhole part on the outer surface of the filter bag.

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