JP3316032B2 - Sieve frame for granular material sieving machine - Google Patents

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 a granular material such as wheat flour and the like. 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 will be described by taking, as an example, a sieve for grain size separation of wheat flour, which is a typical field in which various grain size sorting is required and various apparatuses are used. This will be described below.

[0003] In the flour milling industry that uses a large number of sifters for flour particle size sorting, sifters known as types such as plan shifters and square shifters have long been used for flour particle size sorting. Various types, such as these modified types and intermediate types (junior shifters, etc.), have been proposed and actually used. And the basis of these devices is to perform particle size sorting by passing under the sieve small particles of the granular material supplied on the sieve while making a circular motion etc. in a horizontal plane with a large number of stacked sieve frames The reason that the conventional flour sieving machine is configured by stacking the sieving frames in multiple stages as described above is, in short, a sieving machine that moves over a long sifting surface to perform sifting of flour. The purpose of this is to save space by increasing the sieve area per installed area.

[0004] Such a sieving machine usually drives a sieve frame group in which square sieve frames are stacked and tightened from above and below or a sieve frame group stacked in a sieve frame box with an eccentric shaft having a balance weight. It is provided so as to perform a high-speed circular motion in a horizontal plane by a driving device including a shaft. And since the structure of the sieve frame for constructing such an apparatus requires quick replacement of the sieve mesh when necessary, it is necessary to always prepare and store hundreds to thousands of sieve mesh stocks. As required by industrial equipment, for example, a frame called an outer frame of about 1 m square and a frame called an inner frame (middle frame) with a sieve mesh fitted thereto are attached. In recent years, it is common to use a pair so that the inner frame having a screen can be removed. This is because, among the thousands of sieve frames that need to be prepared and stored as described above, the parts that really need to be replaced should be limited as much as possible, reducing the storage volume and saving labor for replacement work. This is because there is a demand from the industrial equipment side that it is desirable from the viewpoint of chemical conversion.

[0005] From this point of view, the structure of the sieve frame generally used in the past will be specifically described below with reference to Figs.

[0006] The conventional sieve frame shown in these figures,
A rectangular inner frame 500 having a sieve net 501 on its upper surface for screening flour into upper and lower (through) flours (see FIG. 8)
Is fitted to a frame portion of an outer frame 600 (see FIG. 9) provided to have a vertical passage adjacent to three sides around the inner frame.

[0008] The inner frame 500 shown in FIG. 8 is, for example, a wooden frame side 502, 502a constituting a rectangular quadrilateral frame.
And a wooden reinforcing rod 50 laid crosswise inside the rectangle
3 and a sieve net 501 is stretched. Although not shown, the inner frame includes frame sides 502 and 502a.
The above-mentioned sieve net 501 is provided on the lower surface of the frame made of
The crimping net is stretched in parallel with the mesh, and a triangular flat plate-like cleaner having, for example, a hemispherical projection is interposed between the nets so as to be able to move freely, so as to prevent clogging of the sieve net 501. Is common.

[0008] The outer frame 600 shown in FIG. 9 is generally provided with an inner partition wall 606 forming a pair of four sides of a rectangular shape forming a frame portion into which the inner frame is fitted, and provided outside the inner partition wall 606. A pair of outer side walls 607 forming the fine powder drop opening 602, outer side walls 608 of the other pair of opposing sides, and a receiving plate (fine powder flow) for guiding the fine powder (through) passing through the sieve mesh of the inner frame to the drop opening 602. For example, a rectangular receiving plate 603 made of stainless steel or the like is screwed to the lower surface of three parallel wooden bars 604 and fixed to the inner partition 606, and the inner partition 606 is appropriately The receiving plate 603 is fixed to the outer side walls 607 and 608 via the intermediate bracket 605 so that the receiving plate 603 is located at an intermediate position between the upper and lower sides of the sieve frame. Then, slit-shaped fine powder drop openings 609 are formed on the inner partition walls 606 on both the left and right sides of the receiving plate 603 along the upper surface of the receiving plate 603 in the front-rear direction. It falls into the opening 602.

The coarse powder that has moved (flowed) on the sieve net 501 of the inner frame 500 is subjected to the coarse powder drop opening 6 of the inner frame 500.
Slope 502 formed on frame side 502a at a position in contact with 01
b, it is dropped into the coarse powder dropping opening 601 and dropped on the sieve net of the sieve frame one stage below. Note that the lower side of the frame side 502a of the inner frame 500 is formed in the stepped portion 502c, and the stepped portion 604b of the inner partition wall side 604a of the outer frame 600 formed in a stepped shape corresponding to this is formed. The engagement forms a seal portion that prevents the coarse powder from entering the fine powder side.

FIG. 10 shows that the above-mentioned inner frame 500 is
FIG. 11 is an exploded view for explaining the relationship of fitting into FIG.
FIG. 5 is a development view for explaining a state in which the sieve frames configured as described above are stacked such that the coarse powder drop openings 601 are sequentially alternated. FIG. 1
In FIG. 1, the inner frame 500 and the outer frame surfaces 700 and 701 surrounding the inner frame 500 and the coarse powder dropping opening 601 are indicated by the hatched portion. Strongly press down the inner frame 500, the area where the coarse powder flows,
It forms a sealing surface for partitioning from the region where the fine powder flows, and an appropriate sealing sheet is attached as necessary.

[0011]

The conventional sieving machine uses a sieving frame group formed by laminating a large number of sieving frames having the above-described structure to screen and sort flour. Although satisfying the function of sieving and sorting, recently, there is an increasing tendency to demand a powder product having higher added value and containing no coarse powder or the like. In such a case, the conventional sifter cannot cope with the fact that the mixing of coarse powder and the like cannot be strictly ignored.

The present inventor has examined the cause of the incorporation of coarse powder and the like into the fine powder side in view of this problem. It has been found that it occurs not at the sealing surfaces which are the surfaces 700 and 701, but at the engaging portion between the inner side wall 604a and the frame side 502a where the inner frame and the outer frame are not in pressure contact with each other.

This will be described in more detail.
2 explains as follows. That is, the seal at the fitting portion between the frame side 502a and the inner partition side 604a is as follows.
Although these portions are provided at these stepped engagement portions, since a direct rolling force is not applied to the portions from the upper and lower sieve frames, it is desirable to improve them.
0, 701 and the position of the frame side 50
Since the position of the sealing surface provided by the engagement of the inner side 2a and the inner partition side 604a is shifted in the vertical direction, the outer surface of the frame 606 and the frame portion of the outer frame 600 located in the middle of the shift. Since there is no pressing force for bringing the inner partition wall 604a into contact with the inner surface of the inner partition wall 604a at all, there is a dimensional tolerance at the time of manufacturing and a dimensional change with time, and it is inevitable that a gap is generated at the portion. As a result, coarse powder and the like flowing from the sieve mesh indicated by the thick solid line 800 in the figure to the coarse powder dropping opening 601 may be mixed into the fine powder through the gap indicated by the thick chain line 801 in the figure. It became clear that it was.

The problem of the presence of a portion having no sealing pressure can be solved by, for example, providing an inner frame and an outer frame in an integral structure and setting a sieve mesh on the upper portion. However, in this case, the above-mentioned problem, that is, the portion of the sieve frame requiring thousands of sheets that needs to be stored and stored, which needs to be replaced, is limited as much as possible to reduce the storage volume and the replacement work. It cannot meet the demands of industrial equipment 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, can satisfy the demand for labor saving in replacement work, and can provide the conventional sieve. It is an object of the present invention to provide a novel sieve frame for selecting a granular material having an action of satisfactorily preventing coarse particles and the like from being mixed into the fine powder side which may be caused in the frame.

The sieve frame of the present invention, which has been made to achieve the above object, is characterized by an inner frame having a rectangular quadrilateral frame body covered with a sieve mesh, and a rectangular quadrilateral opening into which the inner frame is fitted. The outer frame has a pair of an outer frame having a mold portion, and the outer frame has a receiving plate installed as the lower surface of the frame portion so as to receive fine powder that has passed through a sieve screen, and a pair of opposed rectangular four pieces of the frame portion. A fine powder dropping opening arranged at each of the outer sides of the side so as to drop the fine powder on the receiving plate downward, and arranged on one side of the other opposite side of the rectangular four sides on the sieve net; And an opening for coarse powder falling formed to drop coarse powder downward,
The pair of inner frame and outer frame, coarse particles drop out opening of the outer frame is a sieve frame for a sieve machine used sequentially laminated so that the staggered, the lower surface of the frame body of the frame, the lower Provide a closed curved seal surface facing the side so that it is located on the same horizontal plane .
On the upper surface of the frame portion, to position on the same horizontal plane sealing surface of the closed curve type facing upward <br/> side with the sealing surface of the frame is pressed against
The configuration is such that it is provided.

In the above, it is preferable that a sheet for close sealing is adhered to the sealing surfaces of the inner frame and the outer frame so as to ensure a better sealing state.

The above-mentioned sealing surface is provided, for example, around the frame of the inner frame with an annularly extending upper flange projecting outward at the same height so that a sealing surface is formed on the lower surface of the upper flange. The frame of the outer frame is provided with a stepped portion for engaging the upper flange of the inner frame in which the upper inner periphery is cut out in a ring shape, and the sealing surface of the inner frame is pressed against the upward horizontal surface of the stepped portion. A configuration in which a sealing surface to be formed is formed can be exemplified.

According to the sieve frame of the present invention having the above-described structure, the inner frame having the structure limited as the sieve mesh portion is
Since it is in close contact with the outer frame via the closed curve type sealing surface located in the same plane, the coarse powder side area and the fine powder side area can be strictly partitioned so that there is no need to consider the leaking part. Mixing of coarse powder and the like into the fine powder side is reliably prevented.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described below with reference to an embodiment shown in the drawings.

FIGS. 1 and 2 show the structure of the inner frame 5 of the present embodiment having a sieve net 51, for example, wooden frame sides 52 and 52a forming a rectangular four-sided frame body. A sieve net 5 is placed on a wooden reinforcing rod 53 laid crosswise inside the rectangle.
It has a configuration of one. The crimping net is stretched in parallel with the sieve net 51, and a cleaner (both not shown) is movably interposed between the net and the net to prevent clogging of the sieve as in the related art.

The feature of the inner frame 5 of the present embodiment is that as shown in FIG.
The upper flanges 54, 54a projecting outward at the periphery at the same height position at the upper portion (the lower side in FIG. 2 shown overturned) are continuously connected annularly over the entire four sides of the rectangle. The upper surfaces of the upper flanges 54, 54a (upwardly facing surfaces in FIG. 2, which are shown overturned) serve as sealing surfaces 70, 70a to which the contact sheets 55, 55a are attached. The frame side 52a at the position where the coarse powder on the sieve is dropped into the coarse powder drop opening 61 of the outer frame described below is provided so as to have a larger cross-sectional area than the other frame portions. It is to be. The reason for providing the frame side 52a to have a large cross-sectional area is to increase the section modulus of the frame side 52a of the same portion to increase the bending rigidity and to obtain a reliable seal at the sealing surface 70a. That's why. In this embodiment, for this purpose, the width dimension of the frame side 52a except for the upper flange 54a is set to be larger than the other frame sides 52, and the lower end has a height in contact with the receiving plate of the outer frame described below. It is provided as follows.

As shown in FIG. 1, an inclined surface 52b is formed on the frame side 52a in the same manner as in the prior art so that coarse particles on the sieve mesh 51 can easily fall into the coarse powder drop opening.

FIGS. 3 to 5 show the outer frame 6 of this embodiment, and other parts except for the structure of the frame portion into which the inner frame 5 is fitted are shown in FIG. It is the same as the structure of the conventional sieve frame, and has a rectangular four-sided (square in this example) inner partition 66 forming a pair of opposing sides, and a fine powder drop opening 62 provided on the outer side together with the inner partition 66. A pair of outer side walls 67 to be formed, an outer side wall 68 of the other pair of opposing sides, and the inner frame 5
The fine powder (through) that has passed through the sieve screen 51
2 and a receiving plate 63 as a fine powder flow plate. Reference numeral 65 denotes an intermediate bracket for connecting and fixing the inner partition wall 66 to the outer side walls 67 and 68.

In the present embodiment, the receiving plate 63 is a parallel
A rectangular plate made of stainless steel is screwed to the lower surface of the wooden rod 64, and the three wooden rods 64 are provided as follows. That is, the first wooden rod 64a adjacent to the coarse powder dropping opening 61 in FIG.
As shown in FIG. 5 (particularly, see FIG. 5 viewed from the back side opposite to FIG. 3), the upper corner of the long direction end of the rectangular rod having a constant height is cut out at a height of a certain dimension. The shape is provided.
The center second wooden rod 64b is connected to the first wooden rod 6b.
It is provided as a square rod having a height corresponding to the lower part of the step 4a. Third wooden rod 64c on the opposite side
Is a step-shaped rectangular bar comprising a lower portion having a height corresponding to the stepped lower portion of the first wooden bar 64a and an upper portion having a height corresponding to the entire height of the first wooden bar 64a. Is provided with its lower stage facing inward. Then, the first and third wooden bars 64a contact the upper surface of the second wooden bar 64b from the stepped end portion of the first wooden bar 64b, and the upper surfaces of the first and third wooden bars 64c extend to the lower stage. Of the wooden rods 64a and 64c are flush with the top surfaces of the wooden rods 64a and 64c, and the rectangular annular sealing surfaces 71a, 71c and 71d which are located on the same horizontal plane as a whole are formed. You.

Reference numeral 69 denotes a slit-like fine powder outlet formed between the receiving plate and the inner partition 66.

The frame constituted by the inner partition 66 and the receiving plate 63 as described above is formed by the inner partition 66 located below the receiving plate.
The support frame 66 is fixedly supported at a fixed height from the lower surface of the outer frame by a support rod 66a spaced in parallel in the vertical direction (particularly, see FIG. 4 when the outer frame is viewed from below). Then, a space for the coarse powder to flow on the lower screen is formed.

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

As a result, the annular sealing surfaces 70, 70a of the inner frame 5 located on the same plane are replaced with the annular sealing surfaces 71a, 71 of the outer frame facing the same.
7 and 7d, the sieve frame in which the inner frame 5 and the outer frame 6 are fitted is sequentially laminated with the coarse powder drop openings staggered as shown in FIG. The surfaces are pressed against each other, so that reliable partition sealing of the coarse powder side region and the fine powder side region is achieved. The upper and lower pressures cause the outer frame of the upper sieve frame to strongly press down the lower inner frame and the outer frame, thereby forming the opposing sealing surfaces 70, 70a and 7a.
1a, 71c and 71d are pressed.

When a large number of sieve frames having the above configuration are stacked one on top of the other, and coarse powder is supplied onto the sieve net of the uppermost sieve frame while making a circular motion in a horizontal plane, the coarse powder is screened. While moving on the top 51, it falls from the coarse powder dropping opening 61 onto the next sieve mesh, and in the next stage, moves on the sieve mesh 51 to reach the coarse powder dropping opening 61 located on the opposite side. Further, it falls on the next sieve screen. Then, this is sequentially repeated to be meandered and discharged out of the system through the lowermost sieve frame. On the other hand, the fine powder that has passed through the sieve screen 51 of each stage falls on the receiving plate 63, falls into the fine powder drop opening 62 from the left and right slit-like fine powder drop openings 69, and is guided to the fine powder recovery system.

According to the sieving machine using the sieving frame of the present embodiment having the above-described configuration, the sealing surface for partitioning and sealing the regions on the coarse powder side and the fine powder side is a closed-curve annular ring located on the same plane. Since it is formed as a surface, there is no portion where a pressing force does not act as in the related art, and a reliable close contact seal is realized.

According to the result of the present inventor's screening test of flour using the sieve frame having the structure described with reference to FIGS.
It was confirmed that the entry of coarse particles into the fine powder side could be completely prevented.

The sieving using the sieve frame of the present invention is not limited to flour, but may be carried out by selecting an appropriate particle size, for example, a granular material such as starch or 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 covered with the sieve mesh can be prepared as a confined configuration as the inner frame as in the prior art. The storage capacity of the sieve frame to be prepared can be reduced, and the effect of saving labor for replacement work can be obtained. Furthermore, mixing of coarse powder and the like into the fine powder side which may be caused in the conventional sieve frame Has the effect of being able to almost completely prevent

In addition, the effect that a highly evaluated product can be obtained without mixing any coarse powder or the like into the product is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective external view of an inner frame constituting 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 constituting the sieve frame of the embodiment,

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

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

FIG. 6 is an exploded view for explaining a state in which the inner frame and the outer frame of the embodiment are fitted to each other;

FIG. 7 is a view for explaining an engagement relationship when the sieve frames of the 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 constituting the sieve frame.

FIG. 10 is a development view for explaining a state in which an inner frame and an outer frame constituting the sieve frame are fitted to each other;

FIG. 11 is a view for explaining an engagement relationship when stacking the sieve frame vertically.

FIG. 12 is a perspective view of a main part showing a part of a sieve frame as a perspective view in order to explain a state in which coarse powder and the like are mixed into the fine powder side in the 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 ...・ Coarse powder drop opening, 62
... Aperture for dropping fine powder, 63 ... Receiving plate, 64a, 64
b, 64c, 64d: wooden rod, 65: middle bracket, 66: inner partition, 67, 68: outer side wall, 69: fine powder outlet 70, 70a: sealing surface , 71a, 71c, 71d
... Seal 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 ... Coarse powder drop opening,
602: opening for fine powder falling, 603: receiving plate (fine powder flowing plate), 604: wooden rod, 604a: inner partition side, 604b: stepped portion, 605: middle Bracket, 606: inner partition wall, 607: outer side wall, 608: outer side wall, 609: slit-shaped fine powder outlet, 700, 701: surface (seal surface), 8
00: thick solid line (flow of coarse powder, etc.); 801: thick chain line (mixing path to the fine powder side);

Claims (2)

(57) [Claims] 1. A pair of an inner frame in which a sieve mesh is stretched on a rectangular quadrilateral frame and an outer frame having a rectangular quadrilateral opening mold portion into which the inner frame is fitted. The receiving plate installed as the lower surface of the frame portion to receive the fine powder that has passed through the sieve screen, and the fine powder on the receiving plate is disposed on the outer side of each of a pair of opposing sides of the rectangular four pieces of the frame portion, and A fine powder drop opening formed so as to drop coarse powder on the sieve mesh and an opening for coarse powder drop arranged outside one of the other opposite sides of the rectangular four sides so as to drop coarse powder on the sieve mesh And is provided to have,
The pair of inner frame and outer frame, coarse particles drop out opening of the outer frame is a sieve frame for a sieve machine used sequentially laminated so that the staggered, the lower surface of the frame body of the frame, the lower provided so as to be positioned a seal surface of the closed curve type facing the side on the same horizontal plane, the outer frame frame portion
To the upper surface, the sealing surface of the inner frame is positioned on the same horizontal plane sealing surface of the closed curve type facing upward while pressing
Sieve frame for granular material Sifter, characterized in that provided urchin. 2. An outer frame according to claim 1, wherein an upper flange having the same height and protruding outward is continuously provided annularly around the frame body of the inner frame, and a sealing surface is formed on a lower surface of the upper flange. , the frame portion of the outer frame, the stepped portion for the upper flange engaging said inner frame provided with successively annularly, form a sealing surface sealing surface of the inner frame upward horizontal plane of the stepped portion is pressed against A sieving frame for a granular sieving machine, wherein the sieving frame is used.