JP7505678B2 - Vibrating Screen Equipment - Google Patents

Description

The present invention relates to a vibrating sieve device used for classifying, sorting, filtering, etc., powder materials.

One example of the vibrating screen device described above is the one disclosed in Japanese Utility Model Application Laid-Open Publication No. 6-81674.

This vibrating sieve device is equipped with an upper sieve frame, a middle sieve frame, and a lower sieve frame stacked vertically, a base supporting the lower sieve frame via a spring body, and a vibration mechanism connected to the lower sieve frame to impart vibrations to the lower sieve frame. A sieve screen is provided within each of the upper and middle sieve frames, and a receiving tray is provided below each of the sieve screens, with a number of spheres placed on each receiving tray for tapping the sieve screen. The mesh of the middle sieve screen is finer than that of the upper sieve screen, and each receiving tray is perforated with a number of through holes smaller in diameter than the spheres.

Thus, with this vibrating sieve device, when the powder to be processed is placed into the upper sieve frame while being vibrated by the vibration mechanism, the powder is first sieved into powder with a particle size larger than the mesh of the upper sieve screen, and powder with a particle size smaller than the mesh is separated by the upper sieve screen with a larger mesh size, and the powder with a particle size smaller than the mesh size falls through the sieve screen and then passes through the through holes in the lower receiving tray and falls onto the sieve screen of the middle sieve screen, while the powder with a particle size larger than the mesh size is discharged to the outside as large particle size powder from the discharge port formed in the upper sieve screen.

Next, in the middle sieve frame, the powder that has fallen onto the middle sieve mesh is sieved into powder with a particle size larger than the mesh and powder with a particle size smaller than the mesh. The powder smaller than the mesh falls through the sieve mesh, then passes through the through holes in the lower receiving tray and falls onto the lower sieve frame, where it is discharged to the outside as small particle size powder from the discharge port formed in the lower sieve frame, while the powder with a particle size larger than the mesh is discharged to the outside as medium particle size powder from the discharge port formed in the middle sieve frame.

In this way, this vibrating sieve device is capable of classifying powder into three particle sizes: large, medium, and small. For the purpose of removing foreign matter, the upper sieve frame and upper sieve mesh may be omitted and only the middle sieve frame and lower sieve mesh may be used, and in order to increase the classification accuracy of the sieve mesh, a middle sieve frame and middle sieve mesh may be used in two stages in addition to the upper sieve frame and upper sieve mesh.

Powder easily adheres to the sieve screen, which can easily become clogged, but the conventional vibrating sieve device described above is configured so that a large number of spheres are placed on the receiving tray and receive vibrations transmitted from the vibration mechanism, which strike the sieve screen from below. This striking effect of the spheres prevents the sieve screen from becoming clogged.

Furthermore, if the spheres on the tray are not dispersed and end up gathered in places, the hitting effect of the spheres on the sieve screen will be localized, and clogging of the screen may not be prevented over the entire area.

In response to this, a tray as shown in Figures 6 and 7 has been proposed. This tray 100 is composed of a disk-shaped substrate 101 and three annular partition walls 103, 104, and 105 arranged concentrically on the substrate 101. The partition walls 103, 104, and 105 divide the area on the substrate 101 into three regions, and a sphere 106 is placed in each of the three divided regions.

Conventionally, the partition walls 103, 104, and 105 are each partially fixed to the substrate 101 by spot welding. This is because if the entire area where the partition walls 103, 104, and 105 contact the substrate 101 is welded, the heat input during welding hardens the joints (welds) between the substrate 101 and the partition walls 103, 104, and 105 and causes them to lose toughness. In a vibrating screen device that involves continuous vibration, the joints can easily suffer fatigue failure and become damaged. In addition, the substrate 101 and the partition walls 103, 104, and 105 can deform due to thermal distortion caused by welding, making it impossible to maintain the desired shape.

Incidentally, in the past, as shown in FIG. 8, in order to increase the strength of the partition walls 103, 104, and 105, it has been proposed to fix circular round members 107, 108, and 109 to the upper surfaces of the partition walls 103, 104, and 105, respectively, by spot welding.

Japanese Utility Model Application Publication No. 6-81674

However, the conventional vibrating screen device described above has the following problems. That is, as described above, the partition walls 103, 104, and 105 are each partially fixed to the substrate 101 by spot welding, so that gaps are generated in most areas where the lower surfaces of the partition walls 103, 104, and 105 face the upper surface of the substrate 101, and if powder gets into these gaps, it cannot be easily removed even by washing with water or the like.

In the field of powder processing, if the powder being handled is food, there is the issue of food allergies, and if it is a drug, there is the issue of medicinal efficacy. Therefore, every time the type of powder being processed is changed, at least the path through which the powder passes is generally cleaned with water or the like. However, with the conventional vibrating sieve device described above, the receiving tray was not sufficiently cleaned.

The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a vibrating sieve device equipped with a receiving tray that is easy to clean, has high strength, and has shape stability.

To solve the above problems, the present invention provides:
At least one housing;
a sieve screen disposed within the housing;
A plate-shaped receiving tray provided below the sieve mesh within the housing;
A plurality of spheres disposed on the tray;
a base supporting the housing via an elastic body;
a vibration mechanism connected to the housing for applying vibration to the housing,
The tray is formed as an integral part having no joints, and is provided with a plurality of through holes. The tray further includes a partition wall that protrudes upward and is formed to divide the upper surface into a plurality of regions.
The spheres are associated with vibrating screen devices respectively arranged in the areas separated by the partition walls.

With this vibrating sieve device, when the powder to be processed is put into the housing while being vibrated by the vibration mechanism, the sieve screen separates the powder into powder with a particle size larger than the mesh and powder with a particle size smaller than the mesh. The powder with a particle size smaller than the mesh falls through the sieve screen and passes through the through holes in the receiving tray below, and is then discharged to the outside as small particle size powder from an appropriately formed outlet, while the powder with a particle size larger than the mesh is discharged to the outside as large particle size powder from a similarly appropriately formed outlet.

At that time, the spheres placed on the tray receive vibrations from the vibration mechanism and vibrate vertically as if striking the sieve screen from below, and the striking effect of the spheres prevents clogging of the sieve screen.

The upper surface of the tray is divided into a number of areas by partition walls, and the spheres are placed in each of the divided areas, so that the spheres can be kept dispersed on the tray. This allows the spheres to have a beating effect on the entire sieve screen, effectively preventing clogging of the sieve screen.

The tray has a partition wall that protrudes upward, so it has high strength against loads and vibrations acting on its front and back surfaces (top and bottom). The tray is also formed as a single piece with no joints, and unlike conventional trays, there are no gaps on the front and back surfaces that could allow powder to get in, so it can be easily cleaned by washing with water, etc.

The tray can be made of metal or resin material, and when made of a metal plate, the partition wall can be formed by pressing or hailing. In this case, the partition wall is formed by plastic deformation. When made of resin, it can be formed by injection molding. Also, multiple units each consisting of the housing, sieve, tray, and sphere can be stacked vertically in multiple tiers.

The partition wall may be configured with multiple concentrically formed annular protrusions, and in this case, may further include multiple rib-shaped protrusions arranged radially from the center of the annular protrusions to connect the annular protrusions.

Alternatively, the partition wall can be configured with a circular protrusion and a number of rib-shaped protrusions that are arranged radially from the center of the circular protrusion, are connected to the circular protrusion, and are interconnected at their centers.

It is also preferable that the partition wall has a vertical cross section formed in a mountain shape.

As described above, the vibrating sieve device of the present invention has a tray whose upper surface is divided into a number of areas by partition walls, and spheres are placed in each of the divided areas. This allows the spheres to be kept dispersed on the tray, thereby allowing the spheres to have a beating effect on the entire sieve screen, effectively preventing clogging of the sieve screen.

The tray is also formed with a partition wall that protrudes upward, so it has high strength against loads and vibrations acting on its front and back surfaces (top and bottom). The tray is also formed as a single piece with no joints, and unlike conventional trays, there are no gaps on the front and back surfaces that could allow powder to get in, so it can be easily cleaned by washing with water, etc.

1 is a cross-sectional view showing a vibrating screen device according to an embodiment of the present invention. FIG. 2 is a plan view showing the tray according to the embodiment. 3 is a cross-sectional view taken along the line AA in FIG. 2. FIG. 11 is a plan view showing a tray according to a first modified example of the present invention. FIG. 11 is a plan view showing a tray according to a second modified example of the present invention. FIG. 13 is a plan view showing a tray according to a conventional example. 7 is a cross-sectional view taken along the line BB in FIG. 6. 7 is a cross-sectional view of a tray according to another conventional example, taken along the line BB in FIG. 6 .

Specific embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the vibrating sieve device 1 of this example includes a first sieve frame 10, a second sieve frame 20, and a third sieve frame 30 arranged in a vertically stacked state, a support plate 5 provided at the lower end of the third sieve frame 30, a base 3 supporting the support plate 5 via four compression coil springs 4, a vibration mechanism 40 connected to the support plate 5 and applying vibrations to the support plate 5, and a lid 2 closing the upper opening of the first sieve frame 10. In FIG. 1, the dashed line is a center line, etc., and is not a line indicating the shape.

The first sieve frame 10, the second sieve frame 20, and the third sieve frame 30 are each composed of a hollow cylindrical member with an opening at the top and bottom. A conical (umbrella-shaped) lid 2 is placed on the first sieve frame 10 so as to close the upper opening, and the first sieve frame 10 and the lid 2 are connected to each other by fastening their mutual joint outer periphery with a fastening band 35. An inlet 2a is formed in the center of the lid 2 for feeding the powder to be treated.

A disk-shaped first receiving tray 12 is provided between the first sieve frame 10 and the second sieve frame 20. The first sieve frame 10 and the second sieve frame 20 are fastened to each other by a fastening band 36 while the periphery of the first receiving tray 12 is held between them, thereby connecting the first sieve frame 10 and the second sieve frame 20 to each other.

Similarly, a disk-shaped second receiving tray 22 is provided between the second sieve frame 20 and the third sieve frame 30, and the second sieve frame 20 and the third sieve frame 30 are fastened to each other by a fastening band 37 while the periphery of the second receiving tray 22 is held between them, thereby connecting the second sieve frame 20 and the third sieve frame 30 to each other.

As described above, a support plate 5 is provided at the lower end of the third sieve frame 30, and the third sieve frame 30 and the support plate 5 are interconnected by fastening the outer peripheral joint surface with a fastening band 38.

A circular retaining plate 10a is fixed to the inner peripheral surface of the first sieve frame 10, and a circular first sieve screen 11 is held in a state where it is sandwiched between the retaining plate 10a and the first receiving tray 12 via two circular elastic members 19a, 19b arranged above and below on the outer peripheral edge of the first receiving tray 12.

Similarly, a circular retaining plate 20a is fixed to the inner peripheral surface of the second sieve frame 20, and a circular second sieve screen 21 is held in a state where it is sandwiched between the retaining plate 20a and the second receiving tray 22 via two circular elastic members 29a, 29b arranged above and below on the outer peripheral edge of the second receiving tray 22. The mesh of the first sieve screen 11 is larger than the mesh of the second sieve screen 21.

The first discharge pipe 18 is fixed to the outer peripheral surface of the first sieve frame 10, and connects to a rectangular opening 10b formed above the holding plate 10a so as to contact the upper surface of the holding plate 10a. Similarly, the second discharge pipe 28 is fixed to the outer peripheral surface of the second sieve frame 20, and connects to a rectangular opening 20b formed above the holding plate 20a so as to contact the upper surface of the holding plate 20a.

In addition, within the third sieve frame 30, a conical umbrella member 31 is fixed at its entire outer periphery to the inner peripheral surface of the third sieve frame 30, and the third discharge pipe 32 is fixed to the outer peripheral surface of the third sieve frame 30 and connects to a rectangular opening 30a formed so as to contact the upper surface of the umbrella member 31.

The first tray 12 and the second tray 22 have the same configuration, and in Figures 2 and 3, the reference numerals of the components corresponding to the second tray 22 are shown in parentheses. In the following, the configuration of the first tray 52 will be described as a representative example, but the reference numerals of the corresponding components of the second tray 22 are shown in parentheses.

As shown in Figures 2 and 3, the first tray 12 (second tray 22) is formed in a disk shape and has a plurality of through holes 13 (23) that penetrate vertically. It also has a first protrusion 14 (24), a second protrusion 15 (25), and a third protrusion 16 (26) that protrude upward and act as partition walls that divide the upper surface into a plurality of regions (three regions in this example), and is formed as a single unit with no joints.

As shown in FIG. 2, the first protrusion 14 (24), the second protrusion 15 (25), and the third protrusion 16 (26) are each formed in a circular ring shape in a plan view, and are arranged concentrically with successively smaller diameters in the order of the first protrusion 14 (24), the second protrusion 15 (25), and the third protrusion 16 (26). As shown in FIG. 3, the longitudinal cross section has a mountain shape, and the back side has a circular ring-shaped recess.

A plurality of spheres 17 (27) are arranged in each of the regions divided by the first protrusion 14 (24), the second protrusion 15 (25), and the third protrusion 16 (26), i.e., the region between the first protrusion 14 (24) and the second protrusion 15 (25), the region between the second protrusion 15 (25) and the third protrusion 16 (26), and the region within the ring of the third protrusion 16 (26). The inner diameter of the through hole 13 (23) is smaller than the outer diameter of the spheres 17 (27).

This first tray 12 (second tray 22) can be formed using a metal material or a resin material. When formed from a metal plate, the first protrusion 14 (24), second protrusion 15 (25), and third protrusion 16 (26) can be formed by plastic deformation using press working or hailing, and when made of resin, they can be formed by injection molding.

The vibration mechanism 40 is composed of a drive motor 41 having output shafts 41a and 41b extending vertically, an upper weight 42 connected to the upper output shaft 41a, and a lower weight 43 connected to the lower output shaft 41b. The drive motor 41 is fixed to the lower surface of the support plate 5 through a through hole 5a formed in the center of the support plate 5, with the upper output shaft 41a and the upper weight 42 positioned within the third sieve frame 30. The centers of gravity of the upper weight 42 and the lower weight 43 are located radially outward from the centers of the output shafts 41a and 41b.

Thus, when the drive motor 41 is rotated, the upper weight 42 and the lower weight 43 connected to the output shafts 41a and 41b rotate, and since their centers of gravity are located radially outward from the center of rotation, the drive motor 41 vibrates. This vibration is then transmitted to the support plate 5, and further to the third sieve frame 30, the second sieve frame 20, and the first sieve frame 10 provided on the support plate 5, causing them to vibrate. The support plate 5, the third sieve frame 30, the second sieve frame 20, and the first sieve frame 10 are supported by the compression coil springs 4, and therefore receive the vibration from the drive motor 41 and vibrate freely.

According to the vibrating sieve device 1 of this example having the above configuration, the vibration generated by driving the drive motor 41 of the vibration mechanism 40 is transmitted to the support plate 5, the third sieve frame 30, the second sieve frame 20 and the first sieve frame 10, and while these are vibrating, the powder to be processed is fed into the first sieve frame 10 through the feed port 2a formed at the top of the lid body 2.

When the powder is put into the first sieve frame 10, it first falls onto the first sieve mesh 11 in the first sieve frame 10, and is sieved by the first sieve mesh 11 into powder with a particle size larger than the mesh and powder with a particle size smaller than the mesh. The powder with a particle size smaller than the mesh passes through the first sieve mesh 11 and falls onto the first receiving tray 12 below, while the powder with a particle size larger than the mesh moves on the first sieve mesh 11 toward the opening 10b, passes from the opening 10b through the first discharge pipe 18, and is discharged to the outside from the opening 18a of the first discharge pipe 18 as large particle size powder.

The powder that falls onto the first receiving tray 12 passes through the through holes 13 formed in the first receiving tray 12 and falls onto the second sieve mesh 21 below, where it is sieved into powder with a particle size larger than the mesh and powder with a particle size smaller than the mesh. The powder with a particle size smaller than the mesh passes through the second sieve mesh 21 and falls onto the second receiving tray 22 below, while the powder with a particle size larger than the mesh moves on the second sieve mesh 21 toward the opening 20b, passes from the opening 20b through the second discharge pipe 28, and is discharged to the outside from the opening 28a of the second discharge pipe 28 as medium-sized powder.

The powder that falls onto the second tray 22 passes through the through hole 23 formed in the second tray 22 and falls onto the umbrella member 31 below, moves through the umbrella member 31 toward the opening 30a, passes through the opening 30a and the second discharge pipe 32, and is discharged to the outside from the opening 32a of the third discharge pipe 32 as small particle size powder.

In this way, the vibrating screen device 1 of this example can classify the powder to be treated into three types of particle size: large, medium, and small.

In addition, in this vibrating sieve device 1, a plurality of spheres 17 and spheres 27 are arranged on the first tray 12 and the second tray 22, respectively. The spheres 17 and spheres 27 arranged on the first tray 12 and the second tray 22 receive vibrations from the vibration mechanism 40 and vibrate vertically so as to strike the first sieve screen 11 and the second sieve screen 21 from below, respectively. The striking effect of the spheres 17 and spheres 27 prevents clogging of the first sieve screen 11 and the second sieve screen 21.

The upper surfaces of the first and second trays 12 and 22 are divided into a plurality of regions by the first protruding portion 14, the second protruding portion 15, and the third protruding portion 16, and the first protruding portion 24, the second protruding portion 25, and the third protruding portion 26, respectively, and the spheres 17 and 27 are arranged in each of the divided regions, respectively, so that the spheres 17 and 27 can be arranged in a dispersed state over the entire area of the first and second trays 12 and 22, respectively. This allows the spheres 17 and 27 to have a beating effect over the entire area of the first and second sieve screens 11 and 21, and effectively prevents clogging of the first and second sieve screens 11 and 21.

The first tray 12 and the second tray 22 are formed so that the first protrusion 14, the second protrusion 15, and the third protrusion 16, and the first protrusion 24, the second protrusion 25, and the third protrusion 26, respectively, protrude upward, and therefore have high strength against loads and vibrations acting on their front and back surfaces (upper and lower surfaces). The first tray 12 and the second tray 22 are also formed as a single unit with no joints, and there are no gaps on the front and back surfaces that would allow powder to get in, as in the past, so they can be easily cleaned by washing with water, etc.

In this embodiment, the first receiving tray 12 (second receiving tray 22) is formed with three annular first protrusions 14 (24), second protrusions 15 (25), and third protrusions 16 (26). However, the number of protrusions provided as partition walls is not limited to this, and two or four or more protrusions may be provided.

In addition, when the number of classifications of the treated powder is two, the unit consisting of the second sieve frame 20, the second sieve screen 21, the second receiving tray 22, the spheres 27, the second discharge pipe 28 and the elastic members 29a, 29b may be omitted, and conversely, when the number of classifications is four or more, the units according to the number of classifications may be added in a stacked manner.

(Variation 1)
In the vibrating screen device 1 according to the embodiment described above, the first tray 52 and the second tray 62 of the aspect (variation 1) shown in Fig. 4 can be used in place of the first tray 12 and the second tray 22. The first tray 52 and the second tray 62 have the same configuration, and in Fig. 4, the reference numerals of the components corresponding to the second tray 56 are shown in parentheses, and the configuration of the first tray 52 will be described below as a representative, but the reference numerals of the corresponding components of the second tray 62 are shown in parentheses.

As shown in FIG. 4, the first tray 52 (second tray 62) is formed in a disk shape and has a plurality of through holes 53 (63) penetrating vertically. It also has a first protrusion 54 (64), a second protrusion 55 (65), a third protrusion 56 (66), a fourth protrusion 57 (67), a fifth protrusion 58 (68), and a sixth protrusion 59 (69) that protrude upward and serve as partition walls formed to divide the upper surface into a plurality of regions (five regions in this example), and is formed as a single unit without joints. The through holes 53 (63) have a smaller diameter than the outer diameter of the sphere 17 (27).

The first protrusion 54 (64) and the second protrusion 55 (65) are each formed in a circular ring shape in a plan view, the first protrusion 54 (64) has a diameter larger than the diameter of the second protrusion 55 (65), and are arranged concentrically.

The third protrusion 56 (66), fourth protrusion 57 (67), fifth protrusion 58 (68) and sixth protrusion 59 (69) are rib-shaped protrusions formed radially from the center at equal intervals in the circumferential direction, with their outer peripheries connected to the inner periphery of the first protrusion 54 (64) and their center sides connected to the outer periphery of the second protrusion 55 (65).

It is preferable that the first protrusion 54 (64), the second protrusion 55 (65), the third protrusion 56 (66), the fourth protrusion 57 (67), the fifth protrusion 58 (68) and the sixth protrusion 59 (69) have a mountain-shaped longitudinal cross-section.

A number of spheres 17 (27) are arranged in each of the areas divided by the first protrusion 54 (64), the second protrusion 55 (65), the third protrusion 56 (66), the fourth protrusion 57 (67), the fifth protrusion 58 (68) and the sixth protrusion 59 (69).

Thus, in the first receiving tray 52 (second receiving tray 62) of this embodiment, the upper surface is divided into a plurality of regions by the first protrusion 54 (64), the second protrusion 55 (65), the third protrusion 56 (66), the fourth protrusion 57 (67), the fifth protrusion 58 (68), and the sixth protrusion 59 (69), and the spheres 17 (27) are arranged in each of the divided regions, so that the spheres 17 (27) can be arranged in a dispersed state over the entire area of the first receiving tray 52 (second receiving tray 62). This allows the spheres 17 (27) to have a beating effect over the entire area of the first sieve screen 11 (second sieve screen 21), and effectively prevents clogging of the first sieve screen 11 (second sieve screen 21).

The first tray 52 (second tray 62) has the first protrusion 54 (64), second protrusion 55 (65), third protrusion 56 (66), fourth protrusion 57 (67), fifth protrusion 58 (68), and sixth protrusion 59 (69) formed to protrude upward, so that it has high strength against loads and vibrations acting on its front and back surfaces (upper and lower surfaces). The first tray 52 (second tray 62) is also constructed as a single piece with no joints, and unlike conventional trays, there are no gaps on its front and back surfaces that allow powder to get in, so it can be easily cleaned by washing with water, etc.

In addition, in this modified example 1, the second protrusion 55 (65) may not be provided, and the center sides of the third protrusion 56 (66), fourth protrusion 57 (67), fifth protrusion 58 (68), and sixth protrusion 59 (69) may be directly connected to each other at the center of the first receiving tray 52 (second receiving tray 62). In addition, the number of rib-shaped protrusions is not limited, and multiple rib-shaped protrusions may be provided as needed.

(Variation 2)
In addition, in the vibrating screen device 1 according to the above embodiment, the first tray 12 and the second tray 22 can be replaced with the first tray 12' and the second tray 22' of the aspect (variation 2) shown in Fig. 5. The first tray 12' and the second tray 22' have the same configuration, and are modifications of the first tray 12 and the second tray 22 according to the above embodiment. Therefore, in Fig. 4, the same components as the first tray 12 and the second tray 22 are given the same reference numerals, and the reference numerals of the components corresponding to the second tray 22' are shown in parentheses. In the following, the configuration of the first tray 12' will be described as a representative, and the reference numerals of the corresponding second tray 22' will be shown in parentheses.

As shown in FIG. 5, the first tray 12' (second tray 22') further includes a fourth protrusion 71 (81), a fifth protrusion 72 (82), a sixth protrusion 73 (83), a seventh protrusion 74 (84), an eighth protrusion 75 (85), a ninth protrusion 76 (86), a tenth protrusion 77 (87), and an eleventh protrusion 78 (88) as partition walls formed to protrude upward, and is formed as a single unit without any joints.

The fourth protrusion 71 (81), sixth protrusion 73 (83), eighth protrusion 75 (85), and tenth protrusion 77 (87) are rib-shaped protrusions disposed between the first protrusion 14 (24) and the second protrusion 15 (25), and are formed radially from the center at equal intervals in the circumferential direction, with their outer peripheries connected to the inner peripheries of the first protrusion 14 (24) and their centers connected to the outer peripheries of the second protrusion 15 (25).

The fifth protrusion 72 (82), seventh protrusion 74 (84), ninth protrusion 76 (86), and eleventh protrusion 78 (88) are rib-shaped protrusions that are disposed between the second protrusion 15 (25) and the third protrusion 16 (26) and are formed radially from the center at equal intervals in the circumferential direction, with their outer peripheries connected to the inner peripheries of the second protrusion 15 (25) and their centers connected to the outer peripheries of the third protrusion 16 (26).

Thus, in this embodiment of the first tray 12' (second tray 22'), the upper surface is divided into a plurality of regions by the first protrusion 14 (24), the second protrusion 15 (25), the third protrusion 16 (26), the fourth protrusion 71 (81), the fifth protrusion 72 (82), the sixth protrusion 73 (83), the seventh protrusion 74 (84), the eighth protrusion 75 (85), the ninth protrusion 76 (86), the tenth protrusion 77 (87) and the eleventh protrusion 78 (88), and the spheres 17 (27) are disposed in each of the divided regions, so that the spheres 17 (27) can be disposed in a dispersed state throughout the entire area of the first tray 12' (second tray 22'). This allows the spheres 17 (27) to have a beating effect on the entire area of the first sieve screen 11 (second sieve screen 21), effectively preventing clogging of the first sieve screen 11 (second sieve screen 21).

In addition, the first tray 12' (second tray 22') has the first protrusion 14 (24), the second protrusion 15 (25), the third protrusion 16 (26), the fourth protrusion 71 (81), the fifth protrusion 72 (82), the sixth protrusion 73 (83), the seventh protrusion 74 (84), the eighth protrusion 75 (85), the ninth protrusion 76 (86), the tenth protrusion 77 (87), and the eleventh protrusion 78 (88) protruding upward, so that it has high strength against loads and vibrations acting on its front and back surfaces (upper and lower surfaces). In addition, the first tray 12' (second tray 22') is constructed as an integrated unit without joints, and there is no gap formed on its front and back surfaces through which powder can get in, as in the conventional case, so it can be easily cleaned by washing with water, etc.

In addition, even in this modification example 2, the number of annular protrusions and the number of rib-shaped protrusions provided between them are not limited in any way, and the numbers can be set as appropriate and necessary.

The above describes specific embodiments of the present invention, but the embodiments that the present invention can adopt are not limited to the above examples, and appropriate modifications can be made as necessary.

LIST OF SYMBOLS 1 Vibrating sieve device 2 Lid 3 Base 4 Compression coil spring 5 Support plate 10 First sieve frame 11 First sieve screen 12 First receiving tray 13 Through hole 14 First protruding portion 15 Second protruding portion 16 Third protruding portion 17 Sphere 18 First discharge pipe 19a, 19b Elastic member 20 Second sieve frame 21 Second sieve screen 22 Second receiving tray 23 Through hole 24 First protruding portion 25 Second protruding portion 26 Third protruding portion 27 Sphere 28 Second discharge pipe 29a, 29b Elastic member 30 Third sieve frame 31 Umbrella member 32 Third discharge pipe 35, 36, 37, 38 Fastening band 40 Vibration mechanism 41 Drive motor 42 Upper weight 43 Lower weight

Claims (4)

At least one housing;
a sieve screen disposed within the housing;
A plate-shaped receiving tray provided below the sieve mesh within the housing;
A plurality of spheres disposed on the tray;
a base supporting the housing via an elastic body;
a vibration mechanism connected to the housing for applying vibration to the housing,
The sieve screen is held in the housing in a detachable manner between an annular holding plate provided on an inner peripheral surface of the housing and an outer peripheral edge of the receiving tray,
The tray is provided with a plurality of through holes, is formed as an integral body having no joints, and further includes a partition wall formed to protrude upward so that the longitudinal section has a mountain shape, and is formed to divide the upper surface into a plurality of regions;
A vibrating screen device, characterized in that the spheres are respectively arranged in each of the areas divided by the partition walls. The vibrating screen device according to claim 1, characterized in that the partition wall is composed of multiple annular protrusions formed concentrically. The vibrating screen device according to claim 2, characterized in that the partition wall has a plurality of rib-shaped protrusions arranged radially from the center side of the annular protrusions so as to connect the annular protrusions. The vibrating screen device according to claim 1, characterized in that the partition wall has a circular protrusion and a plurality of rib-shaped protrusions that are radially arranged from the center side of the circular protrusion, are connected to the circular protrusion, and are connected to each other on the center side.

Images