Dust collection hood

Abstract

To provide a dust collection hood with a simple configuration, easy to disassemble and clean, and capable of efficiently controlling powder dust.SOLUTION: A dust collection hood 10 includes: an outer cylinder 20 with a diameter reduced at least at a lower part 24, where a suction port 26 through which air A is sucked on a side surface 22; a first cylindrical part 40 which is stored inside the outer cylinder, and has an upper end 52 placed on an upper end 32 of the outer cylinder, to cover an upper end opening 30 of the outer cylinder, and a diameter at least partially reduced; and a second cylindrical part 60 which is stored below the first cylindrical part inside the outer cylinder, has a through hole S formed communicating between the inside and the outside of the second cylindrical part, and is placed on the lower part 24 with a reduced diameter of the outer cylinder. A gap G is formed between the first cylindrical part and the second cylindrical part. The dust collection hood is installed at an input port 112 for introducing powder and granular material P into a device from above where the powder and granular material is sucked into a suction port from the inside of the first cylindrical part and the second cylindrical part through the through hole and the gap with air.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a dust collection hood for powdery and granular materials. In particular, it relates to a dust collection hood that prevents powdery and granular materials from scattering when they are introduced.

Background Art

[0002] In a solid manufacturing filling machine that manufactures products obtained by packaging powdered chemicals, materials (powdery and granular materials) are introduced from an inlet at the upper part of the device. In such a device, in order to prevent dust from scattering from around the inlet when the powdery and granular materials are introduced, a dust collection hood is installed above the inlet, and measures are taken to suck out the scattered dust from the dust collection hood. In a conventional dust collection hood, the sucked dust may not be completely exhausted, and a part of it may adhere to the inner wall of the dust collection hood and remain. In some cases, this adhered dust that could not be removed even by cleaning the dust collection hood may form lumps, detach and fall, and mix into the product.

[0003] Therefore, in a dust collection hood including a cylindrical portion through which powdery and granular materials pass, an annular pipe provided on the outer peripheral side of the cylindrical portion, a suction port provided over the entire circumferential direction of the inner peripheral surface of the cylindrical portion and communicating with the annular pipe, and a suction outlet provided at one end of the annular pipe and communicating with the outside, a dust collection hood has been proposed in which the position where the suction outlet is provided, the change in the cross-sectional area of the annular pipe from one end where the suction outlet is provided to the other end, and the opening ratio of the suction port are devised to suppress the generation of dust (see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the dust collection hood disclosed in Patent Document 1, disassembly and cleaning are not always easy, and disassembly and cleaning can be time-consuming. Furthermore, if the amount of air sucked in is insufficient, the collected dust may not be completely disposed of, and in some cases, residual powder may fall during cleaning. Therefore, the present invention aims to provide a dust collection hood with a simple structure that is easy to disassemble and clean, and that can efficiently control dust. [Means for solving the problem]

[0006] To solve the above problems, the dust collection hood 10 according to the first aspect of the present invention, as shown in Figures 1 and 2, for example, is a dust collection hood 10 installed at an input port 112 into which powder P is introduced into the device 100 from above, comprising an outer cylinder 20 whose lower part 24 is reduced in diameter and which has an outlet 26 on its side surface 22 into which air A is drawn in, and a first cylindrical part 40 housed inside the outer cylinder 20, the upper end 52 of which is placed on the upper end 32 of the outer cylinder 20 and covers the upper end opening 30 of the outer cylinder 20, and at least The device comprises a first cylindrical portion 40, which is partially reduced in diameter, and a second cylindrical portion 60, which is housed inside the outer cylinder 20 below the first cylindrical portion 40, with a through hole S formed therein that connects the inside and outside of the second cylindrical portion 60, and the second cylindrical portion 60 which is placed on the reduced-diameter lower part 24 of the outer cylinder 20. A gap G is formed between the first cylindrical portion 40 and the second cylindrical portion 60, and granular material P is sucked into the suction port 26 along with air A from inside the first cylindrical portion 40 and the second cylindrical portion 60 through the through hole S and the gap G.

[0007] With this configuration, the powder or granular material fed into the device is supplied to the device through a dust collection hood. The upper end of the first cylindrical section is placed on the upper end of the outer cylinder, and the second cylindrical section is placed on the lower part of the outer cylinder where the diameter narrows, thus assembling it as a dust collection hood. This results in a dust collection hood with a simple structure that is easy to disassemble and clean. Furthermore, the scattered dust, along with the air, is drawn into the suction port not only through the through-hole of the second cylindrical section but also through the gap between the first and second cylindrical sections, thus efficiently suppressing dust.

[0008] A dust collection hood 10 according to a second aspect of the present invention, as shown in Figure 2 for example, has a first cylindrical portion 40 having a portion 42 that narrows in diameter from the upper end 52, a support column 48 that extends upward from below, and a conical cone 80 that rests on the support column 48. With this configuration, the first cylindrical portion narrows in diameter from the upper end and the conical cone is installed inside it, so the inlet for injecting powder and granular material is wide, the flow path narrows towards the bottom, and the central side of the first cylindrical portion is covered by the conical cone, so dust can be prevented from diffusing to the outside from the inlet. Furthermore, since the conical cone is installed by placing it over the support column of the first cylindrical portion, it becomes a dust collection hood with a simple structure that is easy to disassemble and clean.

[0009] In a third aspect of the present invention, as shown in Figure 2, for example, the dust collection hood 10 has a second cylindrical portion 60 having a plurality of support beams 64 extending radially outward from the outer circumference, and the plurality of support beams 64 engage with the tapered lower portion 24 of the outer cylinder 20, so that the second cylindrical portion 60 is placed on the tapered lower portion 24 of the outer cylinder 20. With this configuration, by placing the support beams on the tapered lower portion of the outer cylinder, the second cylindrical portion is positioned in a predetermined position within the dust collection hood 10, resulting in a dust collection hood with a simple structure that is easy to disassemble and clean. [Effects of the Invention]

[0010] According to the present invention, a dust collection hood installed at an input port for introducing powder or granular material into the device from above comprises an outer cylinder that is at least partially reduced in diameter at the bottom and has an air intake port on its side for drawing in air; a first cylindrical part housed inside the outer cylinder, the upper end of which rests on the upper end of the outer cylinder and covers the upper end opening of the outer cylinder, and at least a portion of which is reduced in diameter; and a second cylindrical part housed inside the outer cylinder below the first cylindrical part, the second cylindrical part having a through hole that connects the inside and outside of the second cylindrical part and resting on the reduced-diameter lower part of the outer cylinder, and a gap formed between the first cylindrical part and the second cylindrical part, so that powder or granular material is drawn in from the inside of the first cylindrical part and the second cylindrical part through the gap in addition to the through hole of the second cylindrical part, along with air, into the air intake port. Therefore, a dust collection hood can be provided that has a simple structure, is easy to disassemble and clean, and can control dust more efficiently. [Brief explanation of the drawing]

[0011] [Figure 1] This is a conceptual diagram showing an example of a device using the dust collection hood of the present invention. [Figure 2] This is a conceptual side view showing a dust collection hood as one embodiment of the present invention. [Figure 3] Figure 2 shows an exploded perspective view of the dust collection hood. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described below with reference to the drawings. In each drawing, identical or corresponding devices are denoted by the same reference numerals, and redundant descriptions are omitted.

[0013] Figure 1 is a conceptual diagram showing a solid dosage form manufacturing apparatus 100 that produces a solid dosage form from powder, as an example of an apparatus 100 using the dust collection hood 10 of the present invention. Note that the dust collection hood 10 of the present invention is not limited to the solid dosage form manufacturing apparatus 100, but can also be used in devices that use powders and granules that are fed in from above, such as batteries and other devices that handle powders. The solid dosage form manufacturing apparatus 100 comprises a weighing device 110 that classifies the powdered pharmaceutical raw material P fed in from above and weighs it into the amount required for one tablet, and a molding device 120 that forms the weighed pharmaceutical raw material P into tablets. In the weighing device 110, binders and the like may be added as needed. In the molding device 120, the molded tablets may be coated to make sugar-coated tablets or the like. The tablets D molded in the molding device 120 are transported to the next process (not shown), such as packaging, by a conveying device 130.

[0014] A dust collection hood 10 is installed at the input port 112 into which powder is introduced to the solid dosage manufacturing apparatus 100 or weighing apparatus 110. That is, the powdered pharmaceutical raw material P is introduced into the solid dosage manufacturing apparatus 100 via the dust collection hood 10. At that time, a filter fan 160 is installed above the input port 112, i.e., the dust collection hood 10, to send clean air W downwards. These are to prevent the powdered pharmaceutical raw material P from scattering into the air and spreading as dust to the surroundings when introduced. A suction device 150 is connected to the dust collection hood 10, which sucks in air A from an outlet 26 (described later) and removes dust from the air with a filter or the like. The weighing apparatus 110, molding apparatus 120, conveying apparatus 130, suction device 150, and filter fan 160 can be known devices, so their explanation is omitted.

[0015] The dust collection hood 10 will now be described with reference to Figures 2 and 3. Figure 2 is a conceptual side view of the dust collection hood 10, with hidden lines indicated by dashed lines, and Figure 3 is an exploded perspective view. The dust collection hood 10 comprises an outer cylinder 20 as its shell, a first cylindrical part 40 housed inside the outer cylinder 20, and a second cylindrical part 60 housed below the first cylindrical part 40 inside the outer cylinder 20.

[0016] The outer cylinder 20 has a cylindrical upper part 22 and a lower part 24 that narrows in diameter. A mounting ring 34 is provided on the outer circumference of the lower part 24 so as to completely cover the input port 112 of the weighing device 110 and to allow it to be stably placed on the input port 112. Here, "narrowing in diameter" does not mean a shape in which the diameter decreases smoothly, but also includes a shape in which the diameter decreases in steps. Depending on the dimensions and shape of the input port 112, the mounting ring 34 may not be provided. The upper part 22 is provided with a suction port 26 for sucking in the internal air A along with the dust. The suction port 26 is connected to a suction device 150 via a hose or the like.

[0017] The first cylindrical portion 40 has a tapered upper portion 42 and a cylindrical lower portion 44. The lower portion 44 may also be conical, or it may have a cylindrical portion above the tapered upper portion 42. An outward-projecting edge 52 is formed at the upper end of the first cylindrical portion 40 so that it rests on the upper end of the outer cylinder 20. Multiple support beams 46 extend from the lower portion 44 toward the center, and the multiple support beams 46 are fixed to each other. From the central point where the support beams 46 are fixed to each other, a support column 48 extends to near the upper end of the first cylindrical portion 40. The length of the support column 48 does not necessarily have to extend to near the upper end.

[0018] A conical cone 80 is placed over the support column 48. That is, the cone 80 is positioned in a predetermined location by supporting the top of the cone 80 with the support column 48. It is preferable that a sheath (not shown) that fits onto the support column 48 is provided on the inner surface of the top of the cone 80, as this stabilizes its position when placed over the support column 48. Depending on the dimensions or application of the dust collection hood 10, the support beam 46, support column 48, and cone 80 may not be provided. The height of the cone 80 is preferably approximately the same as the diameter of the upper part 42, but is not necessarily limited to this.

[0019] The second cylindrical portion 60 has multiple support beams 64 extending radially outward from a cylindrical body 62. When the second cylindrical portion 60 is inserted from above the outer cylinder 20, the support beams 64 are supported by the tapering lower part 24 of the outer cylinder 20, thereby positioning the second cylindrical portion 60 in a predetermined location. The second cylindrical portion 60 may also be positioned in a predetermined location by a configuration other than the support beams 64 being supported by the lower part 24 of the outer cylinder 20. For example, beams or ribs may protrude inward from the outer cylinder 20, and the second cylindrical portion 60 may be supported in a predetermined location by the engagement of these beams or ribs with the second cylindrical portion 60.

[0020] A through-hole S is formed through the main body 62 of the second cylindrical portion 60 over the circumferential direction. The through-hole S may be formed by a plurality of slits, or may be formed in a plurality of circular, rectangular, or other arbitrary shapes. Further, the area of the through-hole S on the upstream side of the air flow sucked into the suction port 26 (a position away from the suction port 26) is made relatively larger than the area of the through-hole S on the downstream side (a position close to the suction port 26), so that the amount of air sucked through the through-hole S becomes uniform over the entire circumference of the second cylindrical portion 60.

[0021] When the dust collecting hood 10 is not used, in order to prevent dust from scattering from the apparatus 100 through the dust collecting hood 10 and to prevent dust from the surroundings from entering the dust collecting hood 10, it may have a lid 90 (see FIG. 3) covering the upper end opening 30.

[0022] In the dust collecting hood 10, the second cylindrical portion 60 is inserted through the upper end opening 30 of the outer cylinder 20, and the support beam 64 is supported by the reduced-diameter lower portion 24 of the outer cylinder 20, so that the second cylindrical portion 60 is disposed at a predetermined position. Further, the first cylindrical portion 40 is inserted through the upper end opening 30 of the outer cylinder 20, and the edge 52 of the first cylindrical portion 40 is placed on the upper end 32 of the outer cylinder 20, so that the first cylindrical portion 40 is disposed at a predetermined position. When the first cylindrical portion 40 and the second cylindrical portion 60 are disposed at predetermined positions, a gap G is formed between the first cylindrical portion 40 and the second cylindrical portion 60. For example, as shown in FIG. 2, a gap G is formed between the upper end of the main body 62 of the second cylindrical portion 60 and the lower surface of the reduced-diameter upper portion 42 of the first cylindrical portion 40. Alternatively, the upper end of the main body 62 of the second cylindrical portion 60 has only a height facing the lower portion 44 of the first cylindrical portion 40 (the space between the lower surface of the reduced-diameter upper portion 42 is sufficiently wide), and a gap G may be formed between the inner surface of the main body 62 and the outer surface of the lower portion 44, or the gap G may be formed in other shapes.

[0023] When the conical cone 80 is put on the support column 48, it is preferable that the conical cone 80 extends below the height at which a gap is formed between the first cylindrical portion 40 and the second cylindrical portion 60 and the height at which the through-hole S formed in the main body 62 of the second cylindrical portion 60 is formed, at the center of the internal space of the first cylindrical portion 40.

[0024] The operation of the dust collection hood 10 configured as described above will be described. When the powder or granular material P (in the example of FIG. 1, a pharmaceutical raw material) is introduced into the dust collection hood 10 from above, it passes through the first cylindrical portion 40, the flow path is constricted at the reduced-diameter portion 42, and is introduced into the second cylindrical portion 60 from the lower end. The powder or granular material P passes through the second cylindrical portion 60 and is introduced into the lower device (solid preparation manufacturing device 100). At that time, since air is sent downward from the upper filter fan 160, an air flow is formed from the upper end opening 30, which is the inlet, into the dust collection hood 10. The air flow is sucked by the suction device 150 through the through-hole S of the second cylindrical portion 60.

[0025] The dust generated from the powder or granular material P passing through the dust collection hood 10 floats in the air. Therefore, together with the air flow from the upper end opening 30 to the through-hole S of the second cylindrical portion 60, it is sucked by the suction device 150 from the through-hole S. Therefore, the dust is sucked by the suction device 150.

[0026] In addition, dust may float and remain in the air, and dust may also rise and float after being introduced from the device 100 side. Regarding the dust that floats and rises in the central portion of the flow path of the dust collection hood 10, that is, the central portion of the second cylindrical portion 60, the upward flow from the first cylindrical portion 40 is blocked by the conical cone 80. On the other hand, the dust that floats at the joint between the first cylindrical portion 40 and the second cylindrical portion 60 is sucked by the suction device 150 through the gap G formed between the first cylindrical portion 40 and the second cylindrical portion 60. Therefore, it is not necessary for the suction device 150 to suck a large amount of air, and dust can be efficiently controlled.

[0027] In the dust collection hood 10, the second cylindrical part 60 is inserted into the outer cylinder 20 from above, and the support beam 64 is supported by the narrowing lower part 24 of the outer cylinder 20, positioning it in the predetermined location. Next, the first cylindrical part 40 is inserted into the outer cylinder 20 from above, and the edge 52 of the first cylindrical part 40 is placed on the upper end 32 of the outer cylinder 20, thereby positioning the first cylindrical part 40 in the predetermined location. Then, the conical cone 80 is placed over the support column 48 of the first cylindrical part 40 to complete the assembly. Disassembly can be easily performed in the reverse order of the assembly procedure. Therefore, the structure is simple and disassembly and cleaning are easy. [Explanation of symbols]

[0028] 10 Dust collection hood 20 Outer cylinder 22 Top (side) 24 (Reduced diameter) Lower part 26 Outlet 30 Top opening 32 Top 34 Mounting ring 40 First cylindrical part 42. The part that shrinks in diameter (upper part) 44 (Cylindrical) lower part 46 Post beam 48 Pillar 52 Edge (top edge) 60 Second cylindrical part 62 Main unit 64 Support beams 80 Cone Cones 90 Lid 100 devices 110 Weighing device 112 Inlet 120 Molding equipment 130 Conveying device 150 Suction device 160 Filter Fan A air D product G void P Powder S through hole W Cleaning Air

Claims

1. A dust collection hood installed at the input port into which powders and granules are fed into the device from above, and: An outer cylinder having a reduced diameter at least at the bottom and an air intake on the side through which air is drawn in; A first cylindrical portion housed inside the outer cylinder, the upper end of which rests on the upper end of the outer cylinder and covers the upper end opening of the outer cylinder, and at least a portion of which is reduced in diameter; The outer cylinder comprises a second cylindrical portion housed below the first cylindrical portion, having a through hole that connects the inside and outside of the second cylindrical portion, and the second cylindrical portion resting on the tapered portion of the outer cylinder; A gap is formed between the first cylindrical portion and the second cylindrical portion, and the powder and granular material are drawn from the inside of the first cylindrical portion and the second cylindrical portion through the gap in addition to the through hole to the suction port along with air; The first cylindrical portion has a portion that tapers in diameter from the upper end and a support column that extends upward from below; The system further comprises a conical cone placed on the aforementioned support column; Dust collection hood.

2. A dust collection hood installed at the input port into which powders and granules are fed into the device from above, and: An outer cylinder having a reduced diameter at least at the bottom and an air intake on the side through which air is drawn in; A first cylindrical portion housed inside the outer cylinder, the upper end of which rests on the upper end of the outer cylinder and covers the upper end opening of the outer cylinder, and at least a portion of which is reduced in diameter; The outer cylinder comprises a second cylindrical portion housed below the first cylindrical portion, having a through hole that connects the inside and outside of the second cylindrical portion, and the second cylindrical portion resting on the tapered portion of the outer cylinder; A gap is formed between the first cylindrical portion and the second cylindrical portion, and the powder and granular material are drawn from the inside of the first cylindrical portion and the second cylindrical portion through the gap in addition to the through hole to the suction port along with air; The second cylindrical portion has a plurality of support beams extending radially outward from the outer circumference; The plurality of support beams engage with the tapered lower part of the outer cylinder, thereby allowing the second cylindrical portion to rest on the tapered lower part of the outer cylinder; Dust collection hood.

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