JPH09131508A - Forming device for filter for dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To press form filter raw fabric so as to have an ideal self-supporting state without generating plastic deformation such as the crushing, elongation or crimp of a material in each pressing part at the time of press-forming the plate like filter raw fabric by a press machine so that the cross-section is corrugated shaped. SOLUTION: Plural numbers of punches 2a-2n for press-forming the plate like filter raw fabric R with fixed dies 3a so that the cross-section is corrugated shaped are attached to a vertically moving ram 2T by shifting the position in step form so that at first the punch 2a at the center part or the end part presses with the descent of the ram 2T and next the adjacent punches 2b-2n press successively at a certain interval of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding device for molding a filter used in a dust collector.

[0002]

2. Description of the Related Art A conventional filter for a dust collector, which uses a heat-adhesive fiber (hereinafter simply referred to as a non-woven fabric), which comprises a main fiber and a binder fiber having a lower melting point as a filter material, is entirely a bag. -Shaped bag filter, which is formed into a shape and is configured to retain the shape by inserting a retainer inside, and two filters formed into a corrugated cross-section (concave and convex) in which a large number of peaks and valleys are alternately continuous. There is a self-supporting molding filter constituted by adhering filter media in a state in which valley portions are butted against each other.

Of the above dust collector filters, the latter self-supporting forming filter is a press machine comprising an upper die (punch) and a lower die (fixed die). These two press-molded filter media are adhered (bonded) in a state in which the valley portions are abutted as described above, so that the interval between the facing crests becomes the flow path for the filtered air. It is designed to do.

[0004]

However, in the conventional self-supporting molding filter described above, a flat plate-shaped filter raw material drawn from a sheet roll is interposed between the upper mold and the lower mold of the press machine, and then the upper mold is removed. By descending, the above filter raw material is press-molded into a filter medium having a corrugated cross section in which a large number of peaks and valleys are alternately continuous at a time, so that the material is crushed or extended at the peaks and valleys. , Compositional deformation called pulling occurs, and as a result, the intersection of the fibers of each bent portion, that is, the binder bonding point is removed, affecting the pore distribution and surface lubricity of the surface layer of the filter medium, There is a problem that these impair the filter performance.

Further, in the conventional filter media having a corrugated cross section, internal stress remains during molding by a press,
Both ends are flat and do not expand, but the center part does not support at all, so it greatly expands and deforms after molding, resulting in poor yield and workability when joining two sheets, There were also problems such as the filters hitting each other and the mounting frame when they were assembled.

Therefore, the technical problem of the present invention is that, when a flat plate-shaped raw filter material is press-formed into a corrugated cross-section using a press machine, the material is crushed, stretched or pulled at each press portion. That is, the filter material is press-formed into an ideal self-supporting state without causing the compositional deformation.

[0007]

[Means for Solving the Problems] Means taken in the present invention for solving the above technical problems are as follows.

A plurality of punches are mounted side by side on a ram that reciprocates up and down, and a plate-shaped filter material roll is press-formed into a corrugated cross section between each of these punches that descend with the ram and a fixed die. In the configured dust collector filter forming device,

(1) The plurality of punches are first pressed by the central punch as the ram descends.
Next, the punches that are adjacent to the left and right sides of the ram should be attached in a stepwise manner to the ram so that the punches press with a time lag.

(2) With respect to the plurality of punches, the punch on either the left or right end presses first as the ram descends, and then the adjacent punches press sequentially with a time difference. Install in a staircase-like manner with respect to the ram.

(3) A heating device for adjusting the surface temperature of the punch and the fixed die is built in each of the upper and lower holders for holding the punch and the fixed die.

(4) In addition to the corrugated forming section for forming the original filter cloth into a corrugated cross section on both the punch and the fixed die,
Provide various molding parts that simultaneously mold the venturi part at the inlet and the bag part at the end.

(5) In addition to the corrugating section for corrugating the original filter cloth on both the punch and the fixed die,
To provide a rib forming portion for simultaneously forming a deformation suppressing rib extending in a direction perpendicular to the longitudinal direction of the corrugated shape.

Each means described in the above (1) to (5) operates as follows.

According to the means described in the above (1), when the ram descends, the central punch first presses,
Next, since the adjacent punches on both the left and right sides press sequentially with a time lag, each time the punch presses, the filter roll original fabric is drawn in from both sides in order, and the original fabric is stretched by stretching from both sides or crushed. Since each peak and valley can be molded one by one without sagging, composition deformation such as crushing or extending of the material or pulling of the material occurs at each press part molded into a corrugated cross section. Therefore, it is possible to form an ideal self-supporting filter medium having a smooth surface while keeping the pore distribution in the surface layer of the filter medium sufficiently within a predetermined range.

According to the means described in the above (2), when the ram descends, first the punch on either end on either the left or right side presses first, and then the adjacent punches press one by one with a time difference. Therefore, similarly to the above-mentioned means (1), it is necessary to sufficiently control the distribution of pores in the surface layer of the filter medium and to form a self-supporting ideal filter medium having a smooth surface. To enable.

According to the means described in the above (3), when the surface temperature of both the punch and the fixed die is maintained at, for example, 100 ° C. by using each heating device in press molding, the molding is performed at this temperature. By holding the prepared filter medium for a while, it is possible to surely solidify only the surface layer of the binder fiber (melting point 155 ° C.) that constitutes the filter medium, and to form the required pore size on the surface of the surface, and at the time of press molding. It is possible to secure the shape of and improve the stability of the filter performance.

According to the above-mentioned means (4), the flat plate raw material is press-formed into a corrugated cross section, and at the same time, the venturi portion and the bag portion are integrally formed at the inlet portion and the end portion, respectively. By joining two filter media, it is possible to exert functionality and convenience that can be used as a molding filter as it is.

According to the means described in the above (5), since the flat plate-shaped raw material of the filter is press-formed into the corrugated section, the deformation suppressing rib extending in the direction perpendicular to the longitudinal direction of the corrugated shape is integrally formed. This rib serves as a support for the central portion to prevent deformation after press molding, improve the yield and workability of joining two sheets, and make it possible to provide a high quality molding filter.

As described above, the above (1) to
The technical problem described above can be solved by means described in (5), and the problem of the conventional technology can be solved.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a dust collector filter forming apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a partially omitted plan view of a self-supporting molding filter assembled using two filter media formed by a molding apparatus according to the present invention, and FIG.
-Cross-sectional view taken along the line P, similarly (B) is a cross-sectional view of the formed filter material (cross-sectional hatching is omitted)
The forming filter indicated by reference numeral 1 is two filter media 1 having a corrugated cross section (concave and convex shape) in which a large number of peaks 1H ... and valleys 1V ...
X, 1X are formed by adhering the portions of the respective valley portions 1V ...

In FIG. 1 and FIG. 2, 1F ... Is a filter passage formed in the interval between the facing mountain portions 1H ... 1S ... Is an intermediate portion of each of these filter passages 1F. Deformation-suppressing ribs formed by flattening each part of the valleys 1V on both sides, and these ribs 1S ... Extend in a direction perpendicular to the longitudinal direction of the filter passage 1F. .

Further, in the figure, 1Y ... Venturi portion for sucking dust removal air (pulse jet) formed at the inlet of each filter passage 1F of the molding filter 1 ...
Is a bag portion formed at the end of each filter passage 1F, and each of the venturi portion 1Y and the bag portion 1U and the ribs 1S described above form a corrugated shape during press molding described later. The structure is such that it is integrally molded with the mountain portion 1H ... And the valley portion 1V.

5 to 10 show a flat plate filter raw sheet R formed by the molding apparatus according to the present invention, in which a large number of peaks 1H ... And valleys 1V ... Alternately as shown in FIG. The steps of forming a filter medium 1X having a continuous corrugated section are described step by step. In each of these figures, 2T is a ram that moves up and down along guide shafts 4 and 5 in accordance with press operation, 2a, 2b, 2c ... 2n is a holder 2
A plurality of punches (upper dies) attached to the ram 2T via the ram 2T, each of which has a long width for press-forming the above-mentioned filter passages 1F. As shown in FIG. 5, the central punch 2a is projected to the lowermost side so that the ridges 1H and the valleys 1V can be sequentially formed one by one as the ram 2T descends. ... 2n are sequentially set one step at a time in a staggered position.

Although not shown, each punch 2a-2
Each n is vertically movably attached to each slide shaft provided on the ram 2T, and is supported in the staircase state shown in FIG. 5 by a compression spring also attached to each slide shaft.

Further, in the figure, 3a ... Each of the punches 2a ...
Fixed dies (lower dies) having a long width and provided on the lower side facing 2n, 3 are holders for holding these fixed dies 3a, 3T is a bolster, and 2K and 3K are holders The heating devices 2K and 3K are built-in heaters 2K and 2K.
By adjusting the surface temperature of a ...
The filter material R press-molded as shown in FIG.
It is designed to hold the binder fiber in the surface layer as it is at about 0 ° C until it solidifies (about 1 minute).

FIG. 3 is an enlarged view of the structure of the main part of the present invention shown in FIG. 6, and FIG. 4 is a view for explaining another structure of the present invention. As each ram 2T descends, each punch 2
The punches 2a to 2e are located at the lowermost side of the punch 2a, and the adjacent punches 2b to 2e are sequentially set one step at a time in a staircase-like manner so that the punches 2a to 2e are set in a stepwise manner.

FIG. 11 is a partially omitted side sectional view for explaining the construction of the punches 2a to 2n and the fixed die 3a formed in the above-mentioned long width. In the figure, 2R is the head of each punch, 2X.
And 3X and 2Y and 3Y are the punching portions 2a to 2n and the molding portions for the bag portion 1U and the venturi portion 1Y of FIG. 2n and a molding portion for the deformation suppressing rib 1S of FIG. 1 provided in the intermediate portion of each fixed die 3a, and 3S and 3S are for holding the thickness formed on the upper surfaces of both ends of the fixed die 3a. Which is the stopper surface of the press-formed filter medium 1X.
Secured by S, 3S.

Since the apparatus for forming a dust collector filter according to the present invention has the above-described structure, when the ram 2T is lowered by inserting the flat sheet filter raw material R as shown in FIG. As shown in FIG. 2, the central punch 2a presses the filter medium R to press-form the first mountain portion 1H between itself and the fixed die 3a. The second peaks 1H are press-molded as shown in FIG. 7 with a time lag between 2b and 2b.

As the ram 2T further descends, press forming after the third mountain by the adjacent punches 2c, 2c ...
When the punches 2n, 2n on the outermost sides finish the press forming at the end, the ram 2T stops descending and the holding state shown in FIG. 9 is reached, and the punches 2a to 2n are fixed to the punches 2a to 2n by the heating devices 2K, 3K. By keeping the surface temperature of the die 3a at, for example, 100 ° C. and keeping the surface temperature of the filter raw fabric R for about 1 minute by cooling to a temperature at which the binder fibers are solidified, only the binder fibers in the surface layer are fixed and the required pore diameter is increased. And the press-molded state is secured.

Thereafter, when the ram 2T is raised as shown in FIG. 10, it is possible to take out the filter medium 1X having a corrugated cross section in which a large number of peaks 1H ... And valleys 1V.
Further, in the above-mentioned press molding, the inlet venturi portion 1Y, the end bag portion 1U, and the deformation suppressing rib 1S in the middle portion are also integrally molded in the same manner, so that the two filter media 1X, 1X are formed. The self-supporting molding filter 1 can be produced only by adhering the respective valley portions 1V ...

The punches 2 arranged as shown in FIG.
In the case of a to 2e as well, the peak portion 1H and the valley portion 1V are press-molded one by one in the same procedure as the above-mentioned steps, and the filter material 1X having a corrugated cross section as shown in FIGS. 2B and 10 is obtained. It can be molded.

[0034]

As described above, according to the dust collector filter forming apparatus of the present invention, the punch press-molds the ridges and the valleys one by one, so that the crushing of the filter medium fiber occurs at each press. Since the compositional deformation such as stretching or pulling does not occur, the pore size distribution of the surface layer can be controlled with high accuracy, and a high quality filter filter material having sufficient rigidity can be formed. By holding the filter medium at a predetermined temperature after press molding, only the binder of the surface layer is fixed to secure the required pore size and the form at the time of press molding, and at the same time integrally molding the venturi portion and the bag portion, Together with the point that the deformation suppressing rib is also integrally formed to suppress the deformation after press molding,
It is suitable for use in a filter forming plant in which a filter raw material is produced by using a heat-adhesive fiber and then the raw material is immediately pressed to form a filter medium having a corrugated cross section.

[Brief description of the drawings]

FIG. 1 is a partially omitted plan view of a molding filter formed by using a filter material for a filter for a dust collector according to the present invention.

2 (a) is a cross-sectional view taken along the line PP of FIG.
(B) is a cross-sectional view of the formed filter material.

FIG. 3 is a partial cross-sectional front view illustrating the configuration of the main part of the dust collector filter forming apparatus according to claim 1 of the present invention.

FIG. 4 is a front view, partly in section, illustrating the configuration of the main part of the molding apparatus for a dust collector filter according to claim 2 of the present invention.

FIG. 5 is a front view illustrating a state before pressing of the present invention.

FIG. 6 is a front view illustrating the state when the first mountain is formed according to the present invention.

FIG. 7 is a front view illustrating a state when the second mountain is formed according to the present invention.

FIG. 8 is a front view which similarly illustrates a state at the time of forming each mountain after the third mountain of the present invention.

FIG. 9 is a front view explaining a state during whole mountain molding according to the present invention.

FIG. 10 is a front view for explaining a state when the press finished product of the present invention is taken out.

FIG. 11 is a partially omitted side sectional view of each punch and a fixed die.

[Explanation of symbols]

 1 Self-supporting molding filter 1X Molded filter medium R Flat plate filter material 1H Mountain part 1V Valley part 1Y Venturi part 1U Bag part 1S Deformation suppressing rib 1F Filter passage 2 Holder 2T Ram 2K, 3K Heating device 2a to 2n Punch 3 Holder 3a Fixed die 2X, 3X Venturi molding part 2Y, 3Y Bag part molding part 2Z, 3Z Rib molding part

Claims (5)

[Claims] 1. A plurality of punches are mounted side by side on a ram that reciprocates up and down, and a flat plate-shaped filter raw material is press-formed into a corrugated cross section between each of these punches that descend with the ram and a fixed die. In the dust collector filter forming apparatus configured as described above, the plurality of punches are first pressed by the central punch as the ram descends, and then the adjacent punches on the left and right sides of the punches are sequentially timed. An apparatus for forming a dust collector filter, which is characterized in that it is attached in a stepwise manner with respect to a ram so that it can be pressed. 2. A plurality of punches are mounted side by side on a ram that reciprocates up and down, and a flat plate filter medium is press-formed into a corrugated cross section between each of these punches that descend with the ram and a fixed die. In the dust collector filter forming apparatus configured as described above, the plurality of punches are first pressed by one of the left and right ends of the punches as the ram descends, and then the adjacent punches are sequentially timed. A device for forming a filter for a dust collector, characterized in that the device is attached in a stepwise manner with respect to the ram so that it can be pressed. 3. The dust collector filter according to claim 1, wherein a heater for adjusting the surface temperature of the punch and the fixed die is built in each of the upper and lower holders for holding the punch and the fixed die. Molding equipment. 4. Both the punch and the fixed die are provided with various molding parts for simultaneously molding the venturi portion at the inlet and the bag portion at the end, in addition to the corrugated molding portion for molding the filter raw material into a corrugated cross section. The apparatus for molding a filter for a dust collector according to claim 1 or 2. 5. A rib for simultaneously forming a deformation suppressing rib extending in a direction perpendicular to the longitudinal direction of the corrugated shape, in addition to a corrugated molding portion for corrugating a filter raw material into a corrugated cross section on both the punch and the fixed die. The apparatus for forming a dust collector filter according to claim 1 or 2, further comprising a forming unit.