JPH06320111A - Screen frame for powder/granule-screening machine - Google Patents

Abstract

PURPOSE:To prevent coarse powder from being mixed with a fine powder side by providing the closed curve type sealing surfaces in both the rear face of the frame body of an inner frame stretched with a sieve mesh and the upper face of the opening type frame part of an outer frame fitted with said rear face in a screen frame for a screening machine for sorting grain size of granule such as wheat flour. CONSTITUTION:A screen frame is equipped with both an inner frame 5 wherein a sieve mesh 51 is stretched on a rectangular frame body 52 and an outer frame 6 having a rectangular opening type frame part internally fitted with the inner frame 5. The outer frame 6 is equipped with a receiving plate 63 provided as the rear face of the frame part so as to receive fine powder of undersize, openings 62 for fall of fine powder and an opening 61 for fall of coarse powder. The openings 62 are arranged respectively in the outsides of a pair of opposite sides of four sides of a rectangle in the frame part and fine powder on the receiving plate 63 is allowed to fall below through the openings 62. The opening 61 is arranged in the outside of one hand of a pair of opposite sides of the other and coarse powder on the sieve mesh 51 is allowed to fall below through the opening 61. A closed curve type sealing surface directed to the underside is positioned in the same horizontal surface and provided in the frame body 52 of the inner frame 5. The sealing surface is contacted with pressure to the closed curve type sealing surfaces 71a-71d provided to the frame part of the outer frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sieve frame used in a sieving machine for selecting the size of powder or granular material such as wheat flour, and more specifically, a contact for the selection of powder or granular material sieve used in multiple stages. The present invention relates to the structure of a sieve frame.

[0002]

2. Description of the Related Art The prior art of the present invention is exemplified by a sieving machine for grain size selection of wheat flour, which is a typical field where grain size selection of powder and granules is required and various devices are used. This will be described below.

In the flour milling industry, which uses a large number of sieves for grain size selection of wheat flour, sieves known as types such as plan shifter and square shifter have been used for a long time for grain size selection of wheat flour. Then, various types such as these modified types and intermediate types (junior shifters, etc.) have been proposed and are actually used. The basis of these devices is to perform particle size selection by passing a small number of powder particles supplied on the sieve under the sieve while circularly moving a large number of sieve frames in a horizontal plane. The reason why the conventional flour sieving machine is configured by stacking the sieve frames in multiple stages as described above is, in short, a sieving machine that moves the sieving surface over a long time to perform sieving of wheat flour. This is because the area of the sieve per unit area of the equipment is increased to save the space.

Such a sieving machine usually drives a sieving frame group in which square sieving frames are stacked and tightened from the top and bottom, or a sieving frame group stacked in a sieving frame box, with an eccentric shaft having a balance weight. A shaft drive is provided for high speed circular motion in the horizontal plane. And the structure of the sieve frame for constructing such a device requires rapid exchange of the sieve mesh when necessary, so that hundreds to thousands of sieve mesh stocks can always be prepared and stored. Since it is required in industrial equipment, for example, a frame body called an outer frame of about 1 m square and a frame body called an inner frame (middle frame) fitted with a screen meshed with this are provided. Recently, it is common to use a pair so that the inner frame with the sieve mesh can be removed. It is necessary to limit as much as possible the part that needs to be replaced in the sieve frame that needs to be prepared and stored as described above. This is because there is a demand from the industrial equipment side that it is desirable from the standpoint of commercialization.

From this point of view, the structure of the sieve frame generally used conventionally will be specifically described below with reference to FIGS.

The conventional type of sieve frame shown in these figures is
A rectangular inner frame 500 having a sieve screen 501 stretched on the upper surface for selecting wheat flour into sieve powder and sieve powder (through) (see FIG. 8)
Is fitted to a frame portion of an outer frame 600 (see FIG. 9) provided so as to have a vertical passage adjacent to three sides around the inner frame.

The inner frame 500 shown in FIG. 8 constitutes a rectangular quadrilateral frame body, for example, wooden frame sides 502, 502a.
And a wooden reinforcing rod 50 laid in a cross inside the rectangle
3, and a screen 501 is stretched on top of them. Although not shown, the inner frame includes frame sides 502 and 502a.
On the lower surface of the frame body and the reinforcing rod body 503 made of
A crimp mesh is stretched in parallel with the mesh, and a triangular flat plate cleaner having a hemispherical projection is movably inserted between these meshes so as to prevent clogging of the sieve mesh 501. Is normal.

The outer frame 600 shown in FIG. 9 is generally provided on the outer side of the inner partition wall 606, which is an inner partition wall 606 which forms a pair of opposite sides of a rectangular four sides which form a frame portion for fitting the inner frame. A pair of outer side walls 607 forming the fine powder dropping opening 602, outer side walls 608 of the opposite sides of the other pair, and fine plates (through) that have passed through the sieve screen of the inner frame are guided to the falling openings 602. Plate) 603, for example, a rectangular receiving plate 603 made of stainless steel or the like is screwed to the lower surface of three parallel wooden rods 604 and fixed to the inner partition wall 606. The receiving plate 603, which is fixed by the outer side walls 607 and 608 via the intermediate bracket 605, is provided so as to be at an intermediate position in the vertical direction of the screen frame. Then, slit-like fine powder outlets 609 that are long in the front-rear direction along the upper surface of the receiving plate 603 are formed on the inner partition walls 606 on both the left and right sides of the receiving plate 603, and the fine powder that has passed through the sieve net is dropped on the left and right fine powders. It is designed to be dropped into the opening 602.

The coarse powder that has moved (flowed) over the sieve net 501 of the inner frame 500 is the opening 6 for dropping the coarse powder of the inner frame 500.
Slope 502 formed on frame side 502a at a position in contact with 01
It is dropped from b to the coarse powder dropping opening 601 and dropped on the sieve net of the sieve frame one step below. The lower side of the frame side 502a of the inner frame 500 is formed as a stepped portion 502c, and correspondingly to the stepped portion 604b of the inner partition wall side 604a of the outer frame 600 formed in a stepped shape. By engaging with each other, a seal portion is formed to prevent coarse powder from being mixed into the fine powder side.

In FIG. 10, the inner frame 500 is an outer frame 600.
FIG. 11 is a development view for explaining the relationship of fitting to FIG.
[Fig. 4] is a development view for explaining a state in which the sieve frames configured as described above are stacked with the coarse powder dropping openings 601 being sequentially staggered. This Figure 1
In FIG. 1, surfaces 700 and 701 of the inner frame and the outer frame surrounding the inner frame 500 and the coarse powder dropping opening 601 indicated by the hatched portion are the lower sieve frame by the upper sieve frame (outer frame 600) to be stacked. By strongly pressing down the inner frame 500 of the, the region where the coarse powder flows,
It forms a sealing surface for partitioning from a region in which fine powder flows, and an appropriate sealing sheet is attached if necessary.

[0011]

A conventional sieving machine is one for screening wheat flour using a sieve frame group formed by laminating a large number of sieve frames having the above-mentioned configuration, and basically, Although it satisfies the function of sieving, in recent years, there has been an increasing tendency to demand powder products having a higher added value and containing no coarse powder. In such a case, the conventional sieving machine cannot handle it because the mixture of coarse powder and the like cannot be strictly ignored.

In view of this problem, the present inventor has examined the cause of the mixing of the coarse powder and the like into the fine powder side. As a result, the occurrence of the coarse powder and the like in the conventional sieve frame is closely adhered by pressure. It was found that it occurs not at the sealing surfaces that are the surfaces 700 and 701 but at the engagement portion between the frame side 502a and the inner partition wall side 604a where the inner frame and the outer frame are not pressure-contacted.

To explain this in more detail, FIG.
It is explained as follows by 2. That is, the seal of the fitting portion between the frame side 502a and the inner partition side 604a is
Although it is provided in these stepped engagement portions, the improvement is desirable because the direct pressing force from the upper and lower sieve frames does not act on the portion, but more particularly, the surface 70 of FIG.
The position of the sealing surface formed by 0,701 and the frame side 50
Since the position of the seal surface provided by the engagement of 2a and the inner partition wall side 604a is vertically displaced, the outer surface of the frame body 606 and the frame portion of the outer frame 600 are located in the middle of this displacement. Since there is no pressure contact force that causes these to come into close contact with the contact portion with the inner side surface of the inner partition wall 604a, it is inevitable that a gap will occur in that portion due to dimensional tolerances during manufacturing and dimensional changes over time. The result is that coarse powder flowing from the sieve screen indicated by the thick solid line 800 in the figure to the coarse powder dropping opening 601 causes mixing into the fine powder side through the gap indicated by the thick chain line 801 in the figure. It became clear.

The problem that there is no sealing pressure can be solved by, for example, providing the inner frame and the outer frame in an integral structure and arranging a sieve mesh on the upper part thereof. However, in this way, the above-mentioned problem, that is, the part of the sieve frame that needs to be prepared and stored, which requires as many as thousands, needs to be replaced as much as possible to reduce the storage volume and the replacement work. We cannot meet the demand from the industrial equipment side for labor saving.

The present invention can solve the above-mentioned various problems at the same time, can reduce the volume required for the sieve frame to be prepared and stored, and can satisfy the labor saving requirement of the replacement work, and can be used in the conventional sieve. The purpose of the present invention is to provide a novel sieve frame for selecting powder and granules, which has the effect of satisfactorily preventing the mixture of coarse powder and the like on the fine powder side which may be caused in the frame.

[0016]

Means and Actions for Solving the Problems The features of the sieve frame of the present invention made in order to achieve the above-mentioned object are that an inner frame in which a sieve mesh is stretched on a rectangular quadrilateral frame body, and this inner frame is It is composed of a pair with an outer frame having a rectangular quadrilateral opening mold part to be fitted, and the outer frame is a receiving plate installed as the lower surface of the frame part so as to receive the fine powder that has passed through the screen, and the frame part. Of the rectangular four sides of each of the four opposite sides of each of the opposite sides of the rectangular four sides, which are formed to drop the fine powder on the receiving plate downward, and the outside of one of the opposite sides of the other pair of the rectangular four sides. Arranged and provided to have a coarse powder dropping opening formed to drop the coarse powder on the sieve mesh downward, and the coarse powder on the sieve meanders in sequence on the lower sieve mesh. Sieves for sieving machines that are used by sequentially stacking so that the openings for dropping coarse powder in the outer frame are staggered so as to form a group of sieves that move In the frame body of the inner frame, a closed curve type seal surface facing downward is provided on the same horizontal plane, and a closed curve type seal surface facing upward is pressed against the seal surface of the inner frame. The surface is provided on the frame portion of the outer frame on the same horizontal plane.

In the above, it is preferable to adhere sheets for close contact sealing to the sealing surfaces of the inner frame and the outer frame so as to ensure a better sealing condition.

The above-mentioned sealing surface is formed, for example, by continuously providing an upper flange of the same height, which protrudes outward, in a ring shape around the frame body of the inner frame so as to form a sealing surface on the lower surface of the upper flange. In the frame portion of the outer frame, a stepped portion for engaging the upper flange of the inner frame, which is notched in the upper inner circumference, is continuously provided in an annular shape, and the sealing surface of the inner frame is pressed against the upward horizontal surface of the stepped portion. It is possible to exemplify a structure in which a sealing surface is formed.

According to the screen frame of the present invention having the above-described structure, the inner frame having a localized structure as the screen mesh portion is
Since it comes into close pressure contact with the outer frame through the closed curved type seal surface located in the same plane, the coarse powder side area and the fine powder side area can be strictly divided to the extent that it is not necessary to consider the leak part, and It is surely prevented that coarse powder or the like is mixed into the fine powder side.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described below based on an embodiment shown in the drawings.

FIGS. 1 and 2 show the structure of the inner frame 5 of the present example having a sieve net 51 stretched therein, for example, wooden frame sides 52 and 52a constituting a rectangular four-sided frame body, and its frame sides. The sieve mesh 5 is placed on the wooden reinforcing rod 53 that is laid in a cross inside the rectangle.
It has a configuration of 1. A crimp net is stretched in parallel with the screen 51 and a cleaner (not shown) is movably interposed between the screen and the screen to prevent clogging of the screen, as in the conventional case.

The features of the inner frame 5 of this embodiment are as shown in FIG.
2, 52a has upper flanges 54, 54a projecting to the outside of the periphery at a position of the same height on the upper part (the lower side in FIG. 2 which is shown by overturning) and continuously extending in an annular shape over the entire four sides of the rectangle. The upper flange 54, 54a has a downward surface (upward surface in FIG. 2, which is shown in a fallen state) having the sealing surfaces 70, 70a to which the contact sheets 55, 55a are adhered. The frame side 52a at the position where the coarse powder on the sieve is dropped into the coarse powder dropping opening 61 of the outer frame described below is provided so as to have a larger cross-sectional area than other frame portions. It is in that. The frame side 52a is provided so as to have a large cross-sectional area. By increasing the section modulus of the frame side 52a in the same portion, the bending rigidity is increased and a reliable seal can be obtained at the sealing surface 70a. This is because. For this reason, in this example, the width dimension of the frame side 52a of the portion excluding the upper flange 54a is set to be larger than that of the other frame sides 52, and the lower end thereof has a height in contact with the receiving plate of the outer frame described below. Is provided.

As shown in FIG. 1, a sloping surface 52b is formed on the frame side 52a in the same manner as in the conventional case so that the coarse powder on the screen 51 can easily fall into the coarse powder drop opening.

FIGS. 3 to 5 show the outer frame 6 of this example, and the other parts except the structure of the frame part to which the inner frame 5 is fitted are shown in FIG. The structure is similar to that of the conventional sieve frame, and includes an inner partition wall 66 that forms a pair of opposite sides having a rectangular four-sided (square in this example) shape, and an opening 62 for dropping fine powder that is provided outside the inner partition wall 66 together with the inner partition wall 66. A pair of outer side walls 67 to be formed, another pair of outer side walls 68 on opposite sides, and the inner frame 5
The fine powder (through) that has passed through the sieve net 51 of
2 and a receiving plate 63 as a fine powder flow plate. Reference numeral 65 is an intermediate bracket for connecting and fixing the inner partition wall 66 to the outer side walls 67 and 68.

The receiving plate 63 in the present example has three parallel plates.
A rectangular plate made of stainless steel is screwed to the lower surface of the wooden rod body 64 of the book, and these three wooden rod bodies 64 are provided as follows. That is, the first wooden rod body 64a adjacent to the coarse powder dropping opening 61 of FIG.
As shown in FIG. 5 (in particular, FIG. 5 when viewed from the back side opposite to FIG. 3), a stepped shape is formed by notching the upper corner of the longitudinal end of a rectangular rod of constant height at a constant height. It is provided in a shape.
The second wooden rod body 64b at the center is the first wooden rod body 6 described above.
It is provided as a square bar having a height corresponding to the lower portion of the stepped portion 4a. Third wooden bar 64c on the opposite side
Is a step-shaped rectangular bar composed of a lower step having a height corresponding to the lower stepped portion of the first wooden bar 64a and an upper step having a height corresponding to the entire height of the first wooden bar 64a. Is provided with its lower stage facing inward. The upper surface of the first wooden rod body 64a contacts the upper surface of the second wooden rod body 64b from the stepped portion of the end portion, and further extends to the lower stage of the third wooden rod body 64c so that the upper surfaces are the first and the third. The erected rectangular rod body 64d having a size that is flush with the top surface of the wooden rod bodies 64a, 64c is erected to form the rectangular annular seal surfaces 71a, 71c, 71d located on the same horizontal plane as a whole. It

Reference numeral 69 is a slit-like fine powder dropping port formed between the receiving plate and the inner partition wall 66.

As described above, the frame portion constituted by the inner partition wall 66 and the receiving plate 63 has an inner partition wall 66 located below the receiving plate.
And a support bar 66a that is spaced in parallel in the vertical direction from the lower surface of the outer frame to a fixed height (see FIG. 4 in which the outer frame is viewed from below). In addition, a space for the coarse powder to flow is formed on the lower screen.

FIG. 6 shows a state in which the inner frame 5 having the above structure is fitted into the frame portion of the outer frame 6. That is, the receiving plate 6
3, inside the frame formed by the inner partition wall 66 and the like,
By fitting the stepped lower part of the inner frame 5, the upper flange 5
The sealing surfaces 70, 70a on the lower surfaces of the 4, 54a are brought into contact with the respective sealing surfaces 71a, 71c, 71d of the outer frame 6.

As a result, the annular sealing surfaces 70, 70a of the inner frame 5 which are located in the same plane form the annular sealing surfaces 71a, 71 of the outer frame which are opposed thereto and which are located in the same plane.
Seals that contact the c and 71d, and the sieve frames, into which the inner frame 5 and the outer frame 6 are fitted, are sequentially laminated with the openings for dropping coarse powder staggered as shown in FIG. The surfaces are pressure-welded to achieve reliable partition sealing of the coarse powder side area and the fine powder side area. The outer frame of the upper sieve frame strongly presses the lower inner frame and the outer frame by the upper and lower strong pressures so that the opposing sealing surfaces 70, 70a and 7a
1a, 71c and 71d are brought into pressure contact with each other.

When a large number of sieve frames having the above-mentioned structure are stacked one above the other and coarse powder is supplied onto the sieve net of the uppermost sieve frame while performing circular motion in the horizontal plane, the coarse powder is sieve mesh. While moving on 51, it falls from the coarse powder dropping opening 61 onto the sieve mesh of the next stage, and then moves on the sieve mesh 51 at the next stage to reach the coarse powder dropping opening 61 located on the opposite side. Furthermore, it falls on the next screen. Then, this process is sequentially repeated to meander, and is discharged to the outside of the system through the sieve frame at the lowest stage. On the other hand, the fine powder that has passed through the sieve net 51 of each stage falls on the receiving plate 63, falls from the left and right slit-like fine powder dropping ports 69 into the fine powder dropping opening 62, and is guided to the fine powder collecting system passage.

According to the sieving machine using the sieving frame of the present example having the above-mentioned structure, the sealing surfaces for partitioning and sealing the areas of the coarse powder side and the fine powder side are closed-curve type annular rings located on the same plane. Since it is formed as a surface, there is no portion where a pressure contact force does not act as in the conventional case, and a reliable close contact seal is realized.

According to the results of the sieve screening test of wheat flour using the sieve frame having the constitution described in FIGS. 1 to 7 of the present inventor,
It was confirmed that the mixture of coarse particles on the fine powder side can be completely prevented.

The sieve selection using the sieve frame of the present invention is not limited to wheat flour, and may be performed by appropriately selecting the particle size of powder and granular material, for example, powder and granular material such as starch and ceramics. It goes without saying that you can do it.

[0034]

As described above, according to the sieve frame of the present invention, the portion having the sieve mesh can be prepared as an inner frame having a localized structure as in the conventional case, so that it can be replaced. The storage capacity of the sieve frame to be prepared can be reduced, and the labor required for replacement work can be achieved.Furthermore, the inclusion of coarse powder, etc. on the fine powder side, which may have been caused by conventional sieve frames, is achieved. The effect is that it can be prevented almost completely.

Further, this has the effect that a highly evaluated product can be obtained without any inclusion of coarse powder or the like in the product.

[Brief description of drawings]

FIG. 1 is a perspective external view of an inner frame forming a sieve frame according to an embodiment of the present invention,

FIG. 2 is a perspective external view of the inner frame as viewed from below,

FIG. 3 is a perspective external view of an outer frame that constitutes the sieve frame of the embodiment,

FIG. 4 is a perspective external view of the outer frame as viewed from below,

5 is a perspective external view of the outer frame as viewed from the back side of FIG. 3,

FIG. 6 is a development view for explaining a state in which the inner frame and the outer frame of the embodiment are fitted together,

FIG. 7 is a view for explaining an engagement relationship when the sieve frames of the same embodiment are stacked vertically,

FIG. 8 is an external perspective view showing the configuration of an inner frame that constitutes a conventional sieve frame,

FIG. 9 is an external perspective view showing a configuration of an outer frame forming the sieve frame,

FIG. 10 is a development view for explaining a state in which an inner frame and an outer frame that form the sieve frame are fitted together;

FIG. 11 is a view for explaining an engagement relationship when the sieve frames are stacked vertically,

FIG. 12 is a perspective view of an essential part showing a part of a sieve frame as a perspective view for explaining a state in which coarse powder and the like are mixed into a fine powder side in a conventional sieve frame.

[Explanation of symbols]

5 ... inner frame, 51 ... sieve mesh, 52, 52a ... frame side, 53 ... reinforcing rod, 54, 54a ... upper flange, 6 ... outer frame, 61 ...・ Aperture for dropping coarse powder, 62
... Aperture for dropping fine powder, 63 ... Support plate, 64a, 64
b, 64c, 64d ... Wooden rod body, 65 ... Intermediate bracket, 66 ... Inner partition wall, 67, 68 ... Outer side wall, 69 ... Fine powder drop opening 70, 70a ... Sealing surface , 71a, 71c, 71d
... Sealing surface, 500 ... Inner frame, 501 ... Sieve mesh, 502, 502a ... Frame side, 502b ... Slope, 502c ... Stepped portion, 503 ... Wooden reinforcing rod Body, 600 ... Outer frame, 601 ... Opening for dropping coarse powder,
602 ... Fine powder dropping opening, 603 ... Receiving plate (fine powder sink), 604 ... Wooden rod, 604a ... Inner partition side, 604b ... Stepped portion, 605 ... Intermediate Bracket, 606 ... Inner partition wall, 607 ... Outer side wall, 608 ... Outer side wall, 609 ... Slit-like fine powder drop opening, 700, 701 ... Surface (sealing surface), 8
00 ... Thick solid line (flow of coarse powder, etc.), 801 ... Thick chain line (mixing route to fine powder side),

Claims (2)

[Claims] 1. An outer frame comprising a pair of an inner frame having a rectangular quadrilateral frame body covered with a sieve mesh, and an outer frame having a rectangular quadrilateral opening mold part into which the inner frame fits. Is a receiving plate installed as the lower surface of the frame to receive the fine powder that has passed through the sieve net, and a pair of opposite sides of the rectangular four sides of the frame, which are arranged outside each of the opposite sides, and the fine powder on the receiving plate is moved downward. A fine powder dropping opening formed so as to drop, and a coarse powder dropping opening that is arranged outside one of the opposite sides of the other pair of the four sides of the rectangle and is formed to drop the coarse powder on the sieve mesh downward. , Is provided,
A sieve for a sieving machine that is used by sequentially laminating the coarse powder dropping openings of the outer frame in a staggered manner so that the coarse powder on the sieve meanders to form a sieve group that sequentially moves to the lower sieve screen. In the frame of the inner frame, a closed curved type sealing surface facing downward is provided on the same horizontal plane, and a closed curved type sealing surface facing upward is pressed against the sealing surface of the inner frame. A sieve frame for a powder and grain sieving machine, characterized in that a sealing surface is provided on a frame portion of an outer frame on the same horizontal plane. 2. The upper flange of the same height, which protrudes to the outside, is continuously provided in a ring shape around the frame body of the inner frame, and a sealing surface is formed on the lower surface of the upper flange. In the frame portion of the outer frame, a stepped portion for engaging the upper flange of the inner frame, which is notched in the upper inner periphery, is continuously provided in an annular shape, and the sealing surface of the inner frame is pressed against the upward horizontal surface of the stepped portion. A sieve frame for a powdery or granular material sieving machine, characterized in that a sealing surface is formed.