Screen and pulverizer

Abstract

The screen comprises a plate material, a plurality of grooves are formed in the surface of the plate material, each groove is provided with a plurality of screen holes, the passing size of the screen holes is gradually reduced in the direction away from the grooves, and the maximum passing size of the screen holes is not smaller than the depth of the screen holes. Due to the fact that the screen is of the integrally-formed structure, no internal gap exists, the situation of material blocking is eradicated, cleaning and maintenance are convenient, and the risk of safety production accidents is reduced; in addition, due to the fact that the sieve holes have the taper, the sieve holes can meet the requirements for the hole diameter and the plate thickness in a large-opening and small-opening mode for the medicament powder with the smaller size, machining of the grooves is facilitated, and the situation that the penetrating plate is scrapped due to excessive machining of the grooves is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of pharmaceutical manufacturing, in particular to a screen and a pulverizer. Background Art

[0002] In the pharmaceutical field, a pulverizer is needed to crush the original medicine, and a screen is set at the outlet. Only the pharmaceutical powder smaller than the screen aperture can be dropped, and the rest of the pharmaceutical powder continues to be crushed by the grinding blade. According to the empirical formula, when the aperture is greater than the plate thickness, the pharmaceutical powder can easily pass through the sieve hole, otherwise it will easily clog the sieve hole. For the production of some tablets, more delicate pharmaceutical powder is required. If the empirical formula is still followed, the thickness of the screen will be set very thin, it will lose rigidity and easily deform, and it will scratch the grinding blade due to vibration during production, causing damage.

[0003] For the processing of this type of screen, the prior art CN202803366U "A grinder screen" discloses a coping method. Although the prior art can solve the above technical problems by overlapping and fitting the upper screen with the lower screen, the screen of this solution has a double-layer structure, so there is a gap between the layers, which is easy to cause material jamming, making the cleaning of the screen very difficult. Once the screen is not cleaned properly, it will directly affect the purity of the tablets produced subsequently, thus causing a major production safety accident. Utility Model Content

[0004] The utility model aims to provide a screen to solve the technical problem of material jamming.

[0005] According to the screen mesh of the first aspect of the utility model, it includes a plate material, the surface of the plate material is provided with a plurality of grooves, each of the grooves is provided with a plurality of sieve holes, the pass size of the sieve holes gradually decreases in the direction away from the grooves, and the maximum pass size of the sieve holes is not less than the depth of the sieve holes.

[0006] According to the screen mesh of the embodiment of the utility model, at least the following beneficial effects are achieved: since the screen mesh is an integrated structure, there is no internal gap, which prevents the occurrence of material jamming, and is convenient for cleaning and maintenance, thereby reducing the risk of production safety accidents; in addition, since the screen mesh has a taper, for smaller-sized pharmaceutical powders, the screen mesh can also be processed in a large and small mouth manner to meet the requirements of aperture and plate thickness, so as to facilitate the processing of the groove and avoid the plate being scrapped due to excessive processing of the groove. For example, when the pharmaceutical powder needs to be crushed to less than 0.2 mm, the screen mesh size to be used at this time is 0.2 mm. If the screen mesh does not have a taper, then in order to meet the smooth passage of the pharmaceutical powder, the groove needs to be processed downward to retain only a thickness of 0.2 mm, which places extremely high requirements on the processing equipment. However, if the screen mesh has a taper, the pass size of the screen mesh can be selected as a small mouth of 0.2 mm and a large mouth of 0.4 mm. Then the groove only needs to be processed downward to retain a thickness of 0.4 mm, which reserves sufficient processing margin.

[0007] According to some embodiments of the utility model, the screen has a material-dropping surface and a material-receiving surface, and the material-dropping surface is provided with the groove. During production, the pharmaceutical powder first falls to the material-receiving surface, and if the size of the pharmaceutical powder can pass through the minimum pass size of the screen hole, the pharmaceutical powder will be discharged from the material-dropping surface. For the pharmaceutical powder that cannot meet the minimum pass size of the screen hole, the blade of the pulverizer will continue to grind it until it is crushed into a specified size.

[0008] According to some embodiments of the present invention, the screen is in an arc shape to be suitable for a hammer mill.

[0009] According to some embodiments of the present invention, the screen is funnel-shaped to be suitable for a cone crusher.

[0010] According to some embodiments of the utility model, each of the grooves is in the shape of a regular polygon. Since the grooves are in the shape of regular polygons, the frame around them is also in the shape of regular polygons, and the regular polygon frame can achieve better rigidity with a smaller area.

[0011] According to some embodiments of the present invention, in order to prevent the medicine powder from being contaminated by the grinder, the plate material is a metal component, which can be a #316 stainless steel component.

[0012] According to the second aspect of the present invention, the pulverizer comprises a pulverizing chamber, a power source and the above-mentioned screen, wherein the pulverizing chamber is provided with a feed port and a discharge port, the discharge port is located below the feed port, and the screen covers the discharge port; the power source drives a blade in the pulverizing chamber.

[0013] The pulverizer according to the embodiment of the utility model has at least the following beneficial effects: whenever the pulverizer completes its working task or needs to replace the original medicine, the staff needs to take out the screen for cleaning. Since the screen can meet the passage of fine pharmaceutical powder and will not get stuck, there will be no residual medicine after cleaning, so as to meet the requirements of safe production.

[0014] According to some embodiments of the utility model, the groove of the screen faces the discharge port, and the small opening of the screen hole faces the blade, and the large opening of the screen hole faces the discharge port. When the size of the pharmaceutical powder cannot pass through the small opening of the screen hole, it will be blocked on the screen and cannot be smoothly discharged to the discharge port.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the screen mesh of the embodiment of the utility model;

[0018] Figure 2 It is a top view of the screen of the embodiment of the utility model when it is flattened;

[0019] Figure 3 yes Figure 2 The screen shown is a cross-sectional view along the AA section line;

[0020] Figure 4 yes Figure 2 The screen shown is a partial enlarged view at A.

[0021] In the attached drawings: 100-sheet material, 110-blank material surface, 120-receiving material surface, 200-groove, 210-frame, 300-sieve hole. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0026] like Figures 1 to 3 As shown, the screen according to the first embodiment of the utility model comprises a plate material 100. The plate material 100 is a planar structure before being processed and has two sides. For the convenience of description, the two sides of the plate material 100 are respectively defined as a blanking surface 110 and a receiving surface 120. When the screen is installed in a pulverizer (not shown in the drawings), the receiving surface 120 faces the blade of the pulverizer, while the blanking surface 110 faces the discharge port of the pulverizer.

[0027] Specifically, the blanking surface 110 of the sheet material 100 is provided with a plurality of grooves 200, all of which are arranged and distributed on the sheet material 100, and the shapes of the grooves 200 can be selected to be triangles, rectangles, hexagons, trapezoids, circles, etc. In this embodiment, the shapes of the grooves 200 can be selected to be regular polygons, such as regular triangles, squares, regular hexagons, etc. Since all of the grooves 200 are arranged and distributed on the sheet material 100, and the shapes of the grooves 200 can be selected to be regular polygons, the frames 210 around the grooves 200 are also regular polygons. The regular polygonal frames 210 can achieve better rigidity with a smaller area, so that the screen has good structural strength and is not easily deformed.

[0028] In order to achieve the screening of the pharmaceutical powder, each of the grooves 200 is provided with a plurality of sieve holes 300, which are tapered holes, and whose pass size gradually increases from the material receiving surface 120 to the material blanking surface 110, that is, the small opening of the sieve hole 300 is arranged at the material receiving surface 120, and the large opening of the sieve hole 300 is arranged at the material blanking surface 110. The pass size of the small opening shall be determined according to the requirements of the customer. If the customer requires the blocking of the pharmaceutical powder with a size greater than 0.2 mm, the pass size of the small opening shall be maintained at 0.2 mm, and the pass size of the large opening shall generally be determined according to the processing limit of the groove 200. If the difference between the thickness of the sheet material 100 and the depth of the groove 200 is difficult to maintain within 0.4 mm, then the pass size of the large opening can be selected to be a reasonable processing range of 0.4 mm to 0.5 mm. Of course, if the passage size of the small opening is originally larger than 0.4 mm, the passage size of the large opening can be kept consistent with or slightly larger than the passage size of the small opening. In summary, the maximum passage size of the sieve hole 300 is not less than the depth of the sieve hole 300 to maintain a certain diameter-to-thickness ratio.

[0029] With the above structure, since the screen is an integrated structure, there is no internal gap, which prevents the occurrence of material jams, facilitates cleaning and maintenance, and reduces the risk of production safety accidents. In addition, since the sieve hole 300 has a taper, for smaller-sized pharmaceutical powders, the sieve hole 300 can also adopt a large and small mouth method to meet the requirements of the aperture and plate thickness, so as to facilitate the processing of the groove 200 and avoid the plate being scrapped due to excessive processing of the groove 200. Since the sieve hole 300 of the screen has a reasonable diameter-to-thickness ratio, the pharmaceutical powder can better pass through the sieve hole 300 to reduce the probability of blockage.

[0030] For example, when the pharmaceutical powder needs to be crushed to less than 0.2 mm, the size of the sieve hole 300 is 0.2 mm. If the sieve hole 300 does not have a taper, then in order to ensure the smooth passage of the pharmaceutical powder, the groove 200 needs to be processed downward to retain only a thickness of 0.2 mm, which places extremely high requirements on the processing equipment. However, if the sieve hole 300 has a taper, the passing size of the sieve hole 300 can be selected as a small mouth of 0.2 mm and a large mouth of 0.4 mm. Then the groove 200 only needs to be processed downward to retain a thickness of 0.4 mm, which reserves sufficient processing allowance.

[0031] In some embodiments of the present invention, since the pulverizer is mainly divided into a hammer pulverizer and a cone pulverizer according to the layout structure, the hammer pulverizer requires an arc-shaped screen, while the cone pulverizer requires a funnel-shaped screen. Therefore, in order to meet the use requirements of different pulverizers, the screen can be processed into an arc shape or a funnel shape. It is understandable that the present invention does not limit the specific shape of the screen, and the screen can also be processed into any shape, without limitation thereto.

[0032] In some embodiments of the present invention, since the pulverizer is mainly used in the pharmaceutical industry, it has strict requirements on production materials. In order to prevent the pharmaceutical powder from being contaminated by the pulverizer, the parts of the pulverizer that contact the pharmaceutical powder are made of environmentally friendly materials, and for parts with rigidity requirements, such as screens, blades, and pipes, #316 stainless steel can be used.

[0033] like Figure 2 and Figure 4 As shown, under the premise that all the grooves 200 are arranged and distributed in the sheet material 100, a plurality of the sieve holes 300 are arranged and distributed in each of the grooves 200. Since the structure of the sieve mesh is consistent everywhere, a sieve mesh of any size can be obtained by cutting to meet the design requirements of different crushers. In addition, the utility model does not specifically limit the shape of the sieve hole 300, and the shape of the sieve hole 300 can be selected as a long strip forming a herringbone structure, a square forming a matrix, or a circle forming a matrix.

[0034] It should be further explained that the pass size of the sieve hole 300 refers to the size that can be used for material to pass through. Since the pharmaceutical powder is granular, even if the shape of the sieve hole 300 is set to be a long strip, the pass size of the sieve hole 300 is the inner width of the hole.

[0035] According to the pulverizer of the second embodiment of the utility model, it includes the screen according to the above-mentioned first embodiment of the utility model, and also includes a pulverizing chamber and a power source, the pulverizing chamber is provided with a feed port and a discharge port, the discharge port is located below the feed port, the feed port is connected to a feed pipe, the discharge port is connected to a discharge pipe, and the screen covers the discharge port. The groove 200 of the screen faces the discharge port, at this time, the small opening of the screen hole 300 faces the blade, and the large opening of the screen hole 300 faces the discharge port. When the size of the pharmaceutical powder cannot pass through the small opening of the screen hole 300, it will be blocked on the screen and cannot be smoothly discharged into the discharge pipe.

[0036] In addition, the power source may be a motor that drives a plurality of blades in the pulverizing chamber. If the pulverizer is a hammer pulverizer, the screen is in the shape of an arc, with the rotating shaft of the power source as the central axis, and the length of each blade is slightly smaller than the diameter of the screen, so that the blade almost completely fills the volume of the pulverizing chamber. If the pulverizer is a cone pulverizer, the screen is in the shape of a funnel, with the rotating shaft of the power source as the rotating axis, and each blade almost fits the receiving surface 120 of the screen.

[0037] When the pulverizer is working, the raw medicine enters the pulverizing chamber from the feed pipe, and the multiple blades in the pulverizing chamber rotate at high speed under the drive of the power source to process the raw medicine into powder. If the size of the pharmaceutical powder can pass through the small opening of the sieve hole 300, the pharmaceutical powder will fall from the large opening of the sieve to the discharge pipe. For the pharmaceutical powder that cannot pass through the small opening, the blades of the pulverizer will continue to grind it until it is ground into a specified size.

[0038] Whenever the pulverizer completes its task or needs to replace the original medicine, the staff needs to take out the screen for cleaning. Since the screen can meet the passage of fine pharmaceutical powder and will not get stuck, there will be no residual medicine after cleaning, so as to meet the requirements of safe production.

[0039] According to the screen processing method of the third aspect of the utility model, the screen processing method uses the screen according to the first aspect of the utility model, and comprises the following steps:

[0040] S100. Since the sheet material 100 is a metal component, the sheet material 100 can be etched to form a plurality of grooves 200 on the surface of the sheet material 100. Compared with the conventional machining process, the etching process can simultaneously process a plurality of grooves 200 in one process, and the machining accuracy is higher. Since the mesh holes 300 of the screen have a taper, a certain etching margin can be reserved to avoid the board being scrapped due to excessive etching.

[0041] S200. Processing multiple sieve holes 300 with tapers in each of the grooves 200 by laser equipment. For traditional machining equipment, the taper hole cannot be formed at one time, but for the laser punching machine for taper hole processing, it processes the surface of the taper hole without contact through the laser beam, and performs cutting and punching according to the three-dimensional effect diagram set by the computer. The laser punching machine for taper hole processing uses a motor with large load capacity, better heat dissipation, and stronger driving ability. In combination with a larger vibrating lens, the moment of inertia is strictly controlled, the influence of the taper hole is weakened, and an efficient cutting and scanning speed is obtained. It can complete more taper hole processing, greatly improve production efficiency, save production costs, and has advantages that traditional die-cutting machines cannot match.

[0042] S300. Process the screen into a desired shape, such as an arc shape or a funnel shape, by mechanical equipment. Since there are many mechanical equipments that can process the screen from a plane structure to a three-dimensional structure, such as a rounding machine, they will not be described one by one here. It should be noted that for a funnel-shaped screen, it is necessary to weld the head and tail parts after curling, while for a circular arc-shaped screen, the welding step can be omitted.

[0043] Through the above steps, the utility model can process a flat plate 100 into a required structure and shape. The processed screen can not only meet the passage of fine pharmaceutical powder, but also has the advantages of no material jamming and high mechanical strength, and has huge market potential.

[0044] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A screen, characterized in that: The invention comprises a plate material (100), wherein a plurality of grooves (200) are provided on the surface of the plate material (100), each of the grooves (200) is provided with a plurality of sieve holes (300), the passage size of the sieve holes (300) gradually decreases in a direction away from the grooves (200), and the maximum passage size of the sieve holes (300) is not less than the depth of the sieve holes (300).

2. The screen according to claim 1, characterized in that: The screen has a blanking surface (110) and a receiving surface (120), and the blanking surface (110) is provided with the groove (200).

3. The screen according to claim 2, characterized in that: The screen is in the shape of an arc.

4. The screen according to claim 2, characterized in that: The shape of the screen is funnel-shaped.

5. The screen according to claim 1, characterized in that: The shape of each of the grooves (200) is a regular polygon.

6. The screen according to claim 1, characterized in that: The plate material (100) is a metal component.

7. A pulverizer, characterized in that The sieve according to any one of claims 1 to 6 further comprises: A pulverizing chamber, which is provided with a feed port and a discharge port, wherein the discharge port is located below the feed port, and the screen covers the discharge port; A power source drives a blade in the pulverizing chamber.

8. The pulverizer according to claim 7, characterized in that: The groove (200) of the screen faces the discharge port.

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