CA2313340A1 - An arrangement for cleaning the upper and/or lower punches of a rotary press - Google Patents
An arrangement for cleaning the upper and/or lower punches of a rotary press Download PDFInfo
- Publication number
- CA2313340A1 CA2313340A1 CA 2313340 CA2313340A CA2313340A1 CA 2313340 A1 CA2313340 A1 CA 2313340A1 CA 2313340 CA2313340 CA 2313340 CA 2313340 A CA2313340 A CA 2313340A CA 2313340 A1 CA2313340 A1 CA 2313340A1
- Authority
- CA
- Canada
- Prior art keywords
- punches
- cleaning
- motor
- arrangement
- cleaning brushes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/0082—Dust eliminating means; Mould or press ram cleaning means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
- B30B11/08—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with moulds carried by a turntable
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
- Detergent Compositions (AREA)
- Medical Preparation Storing Or Oral Administration Devices (AREA)
Abstract
An apparatus for cleaning the upper and/or lower punches of a rotary press, more particularly a rotary tablet press, comprising at least one rotatable cleaning brush which is positioned in the path of movement of the punches in a region of a cavity plate of the rotary press where the punches are situated in a position remote from the particular cavity.
Description
AN ARRANGEMENT FOR CLEANING THE UPPER AND/OR LOWER
PUNCHES OF A ROTARY PRESS
Field of the Invention This invention relates to a device for cleaning the upper and/or lower punches of a rotary press, more particularly a rotary tablet press.
Background of the Invention Rotary tablet presses for making tablets, such as detergent tablets, are known. They normally consist of a rotor with a cavity plate comprising an upper part and a lower part, the lower part and the upper part guiding the upper and lower punches engaging in the cavities of the cavity plate.
In certain positions, the pressure stations, the upper and lower punches are lowered and raised towards the cavity by pressure rollers and in this way apply the tabletting pressure to the mixture to be tabletted.
It has been found that the deposits accumulating on the punch surfaces in the production of tablets (adversely) affect the subsequent solubility of the detergent tablets. These deposits result in shortening of the compression path and hence in an unintended, uncontrollable increase in the tabletting pressure. As a result of this increase in the tabletting pressure attributable to deposits, the tablets are unevenly compressed which has an adverse effect on the solubility of the tablets thus produced.
In view of the high production rate of tablet presses and the lowering and lifting movements of the punches, the dwell time of each individual punch in a particular position is very short. In addition, space is very restricted in such tablet presses so that the punches are extremely difficult to clean, especially since it is important to ensure that the deposits removed from the upper punches do not drop onto the underlying lower punches.
The problem addressed by the present invention was to enable punches in rotary presses, more particularly rotary tablet presses, to be automatically cleaned to a standard in line with the requirements mentioned above.
PUNCHES OF A ROTARY PRESS
Field of the Invention This invention relates to a device for cleaning the upper and/or lower punches of a rotary press, more particularly a rotary tablet press.
Background of the Invention Rotary tablet presses for making tablets, such as detergent tablets, are known. They normally consist of a rotor with a cavity plate comprising an upper part and a lower part, the lower part and the upper part guiding the upper and lower punches engaging in the cavities of the cavity plate.
In certain positions, the pressure stations, the upper and lower punches are lowered and raised towards the cavity by pressure rollers and in this way apply the tabletting pressure to the mixture to be tabletted.
It has been found that the deposits accumulating on the punch surfaces in the production of tablets (adversely) affect the subsequent solubility of the detergent tablets. These deposits result in shortening of the compression path and hence in an unintended, uncontrollable increase in the tabletting pressure. As a result of this increase in the tabletting pressure attributable to deposits, the tablets are unevenly compressed which has an adverse effect on the solubility of the tablets thus produced.
In view of the high production rate of tablet presses and the lowering and lifting movements of the punches, the dwell time of each individual punch in a particular position is very short. In addition, space is very restricted in such tablet presses so that the punches are extremely difficult to clean, especially since it is important to ensure that the deposits removed from the upper punches do not drop onto the underlying lower punches.
The problem addressed by the present invention was to enable punches in rotary presses, more particularly rotary tablet presses, to be automatically cleaned to a standard in line with the requirements mentioned above.
Summary of the Invention According to the invention, this problem has been solved by a device which comprises at least one rotatable cleaning brush which is positioned in the path of movement of the punches in that region of the cavity plate of the rotary press where the punches are situated in a position remote from the particular cavity.
Accordingly, the invention provides a cleaning arrangement which can be made in very small dimensions so that it is suitable for the cramped conditions in rotary tablet presses. The at least one cleaning brush which, in principle, may be made of any brush material, with the proviso that the punch surfaces should not of course be scratched by the brush, has to be driven at high rotational speeds, for example 30,000 r.p.m., in view of the short dwell time of the punches in the cleaning zone. Under the effect of the rotating brush, deposits on the punches are removed very quickly and can be carried away.
To this end, the arrangement preferably comprises an extraction system, preferably suction disposed adjacent the at least one cleaning brush. The dust-like deposits removed by the brush are then immediately carried away by the suction system and are unable to reach other parts of the press, for example the lower punches.
Detailed Description of the Invention In order to achieve an optimal cleaning result, the at least one cleaning brush is advantageously arranged in such a way that the shaft about which it rotates is at substantially a right-angle to the longitudinal axis of the punches.
The cleaning result can be significantly improved by providing at least two cleaning brushes driven in opposite directions. The facets of the punches are particularly difficult to clean because, if only one cleaning brush is used, the facets cannot be cleaned off due to the formation of a dead angle. By providing at least two cleaning brushes driven in opposite directions, even the facets are properly cleaned under the effect of the resulting rotation of the brushes in opposite directions. This is particularly advantageous when the punches are designed as recessed punches.
The cleaning brushes may advantageously have different diameters for adaptation to different local conditions. Thus, it may be necessary in view of the lowering and lifting movement of the punches, the short dwell time in one position and the limited availability of space for the brush cleaning last to be adapted in diameter to the lifting movement of the punch moving past it, i.e. to have a larger diameter in this particular case because the cleaning brush is then passed by the punches with a larger stroke.
If two cleaning brushes are provided, they are advantageously driven by a common motor via a gear system, for example a spur gear.
The motor is preferably an electrical d.c. motor which is available in very small dimensions and, accordingly, may be directly positioned in the vicinity of the cleaning brushes. However, it may also be disposed in a remote position and connected to the cleaning brushes via a flexible shaft or the like.
In order to obtain a compact arrangement, the cleaning brushes are advantageously arranged in a housing in which the gear unit is integrated and to which the motor is fixed. Any electrostatic charges built up during cleaning are dissipated by the cleaning brushes via the housing. Through their special arrangement and their high rotational speed, the cleaning brushes are automatically cleaned with each revolution and the dust-like deposits are carried away by the extraction system.
The arrangement according to the invention is particularly suitable for cleaning the upper punches of rotary tablet presses. Basically, the cleaning brushes may consist of different brush materials, for example metal bristles, fiber bristles based on natural products, plastics, such as polyethylene, polypropylene, polyamide, polyurethane, polycarbonates, polyacetals, polyvinylene oxides and sulfides, styrene copolymers, polyvinyl chloride or composite materials produced therefrom, for example glass-fiber-reinforced plastic. Polyamide is preferred. The punches to be cleaned are primarily rectangular punches, round punches and punches with embossing elements.
Brief Description of the Drawings The invention is described in more detail in the following with reference to the accompanying drawings, wherein:
Figure 1 is a partly exploded view of an arrangement according to the invention;
Figure 2 is a basic side elevation of the arrangement showing its most important parts; and Figure 3 is a plan view of part of a rotary press showing the layout of the arrangement.
Figure 1 shows part of a rotary tablet press of known construction generally denoted by the reference numeral 1. The rotary tablet press comprises a rotor (not shown in detail) with a cavity plate 3 comprising an upper part and a lower part, the upper part and the lower part guiding upper and lower punches which engage in the cavities 4 and of which one punch 5 is shown by way of example in Fig. 2. In certain positions, the pressure stations, the upper and lower punches 5 are lowered and raised towards the cavity 4 by pressure rollers and in this way apply the tabletting pressure to the mixture to be tabletted. The punches 5 are then brought back into a position remote from the cavity plate, for example in the arrowed (arrow 6) region of the path of movement of the punches 5. An arrangement according to the invention generally denoted by the reference 7 may advantageously be arranged in the region 6.
In the illustrated embodiment (Fig. 1 ), the arrangement 7 according to the invention for cleaning the punches 5 of the rotary tablet press comprises two cleaning brushes 9 which are mounted for rotation in a housing 8, which may differ in diameter and of which the bristles preferably consist of plastic, although basically they may consist of any material with the proviso that this material should not scratch the compression surfaces of the punches 5. The cleaning brushes 9 are mounted for rotation in the housing 8 and are driven in opposite directions, as indicated by arrows 10 in Fig. 2. The arrangement of the cleaning brushes 9 is preferably such that the shafts 11 about which they rotate are substantially at a right-angle to the longitudinal axis 5a of the particular punch 5 to be cleaned. The shafts 11 of the cleaning brushes 9 are coupled to a gear unit 12 which is preferably integrated in the housing 8 and which is preferably driven by an electrical d.c. motor 13. The d.c. motor 13 comprises a motor housing 14, a motor fixing bracket 15, a holder 16 for the gear unit, a voltage supply 17 and a motor ventilation system 18. The motor may readily be fixed by its bracket 15 to a mounting rail 19 of the housing 8, the holder 16 for the gear unit being coupled to a gear coupling 20 of the gear unit 12.
The arrangement 7 additionally comprises a tube-like extraction system 21 which is disposed adjacent the cleaning brushes 9.
The gear unit 12 is preferably a spur gear and the gear holder 16 of the d.c. motor 13 is provided with a quick-action clamp. The brushes 9 can be driven at extremely high rotational speeds, for example at 30,000 r.p.m. Over its path of movement, the particular punch 5 of the rotary tablet press 1 comes into contact with the cleaning brushes 9 in a position remote from the cavity plate 3. The cleaning effect is radial and axial and is also staggered through the rotation of the cleaning brushes 9 in opposite directions. The brushes 9 clean themselves automatically through their rotation and the dust-like particles are carried away by the extraction system 21.
The d.c. motor 13 may be additionally provided with a processor cooler on the motor housing 14 although this is not shown.
The arrangement shown in Fig. 1 is extremely compact so that it is particularly well adapted to the cramped conditions in a rotary tablet press 1. For example, the length of the cleaning brushes is 9100 mm for a brush diameter of 25 mm, the length of the gear unit is about 50 mm and the installed length of the motor housing is 13,200 mm so that the overall length of the arrangement 7 is only about 350 mm.
The invention is not of course confined to the illustrated embodiment. Other embodiments are possible without departing from the basic concept. Thus, the arrangement 7 may also be driven by a remote motor via a flexible shaft. More than two cleaning brushes 9 may be provided, etc.
Accordingly, the invention provides a cleaning arrangement which can be made in very small dimensions so that it is suitable for the cramped conditions in rotary tablet presses. The at least one cleaning brush which, in principle, may be made of any brush material, with the proviso that the punch surfaces should not of course be scratched by the brush, has to be driven at high rotational speeds, for example 30,000 r.p.m., in view of the short dwell time of the punches in the cleaning zone. Under the effect of the rotating brush, deposits on the punches are removed very quickly and can be carried away.
To this end, the arrangement preferably comprises an extraction system, preferably suction disposed adjacent the at least one cleaning brush. The dust-like deposits removed by the brush are then immediately carried away by the suction system and are unable to reach other parts of the press, for example the lower punches.
Detailed Description of the Invention In order to achieve an optimal cleaning result, the at least one cleaning brush is advantageously arranged in such a way that the shaft about which it rotates is at substantially a right-angle to the longitudinal axis of the punches.
The cleaning result can be significantly improved by providing at least two cleaning brushes driven in opposite directions. The facets of the punches are particularly difficult to clean because, if only one cleaning brush is used, the facets cannot be cleaned off due to the formation of a dead angle. By providing at least two cleaning brushes driven in opposite directions, even the facets are properly cleaned under the effect of the resulting rotation of the brushes in opposite directions. This is particularly advantageous when the punches are designed as recessed punches.
The cleaning brushes may advantageously have different diameters for adaptation to different local conditions. Thus, it may be necessary in view of the lowering and lifting movement of the punches, the short dwell time in one position and the limited availability of space for the brush cleaning last to be adapted in diameter to the lifting movement of the punch moving past it, i.e. to have a larger diameter in this particular case because the cleaning brush is then passed by the punches with a larger stroke.
If two cleaning brushes are provided, they are advantageously driven by a common motor via a gear system, for example a spur gear.
The motor is preferably an electrical d.c. motor which is available in very small dimensions and, accordingly, may be directly positioned in the vicinity of the cleaning brushes. However, it may also be disposed in a remote position and connected to the cleaning brushes via a flexible shaft or the like.
In order to obtain a compact arrangement, the cleaning brushes are advantageously arranged in a housing in which the gear unit is integrated and to which the motor is fixed. Any electrostatic charges built up during cleaning are dissipated by the cleaning brushes via the housing. Through their special arrangement and their high rotational speed, the cleaning brushes are automatically cleaned with each revolution and the dust-like deposits are carried away by the extraction system.
The arrangement according to the invention is particularly suitable for cleaning the upper punches of rotary tablet presses. Basically, the cleaning brushes may consist of different brush materials, for example metal bristles, fiber bristles based on natural products, plastics, such as polyethylene, polypropylene, polyamide, polyurethane, polycarbonates, polyacetals, polyvinylene oxides and sulfides, styrene copolymers, polyvinyl chloride or composite materials produced therefrom, for example glass-fiber-reinforced plastic. Polyamide is preferred. The punches to be cleaned are primarily rectangular punches, round punches and punches with embossing elements.
Brief Description of the Drawings The invention is described in more detail in the following with reference to the accompanying drawings, wherein:
Figure 1 is a partly exploded view of an arrangement according to the invention;
Figure 2 is a basic side elevation of the arrangement showing its most important parts; and Figure 3 is a plan view of part of a rotary press showing the layout of the arrangement.
Figure 1 shows part of a rotary tablet press of known construction generally denoted by the reference numeral 1. The rotary tablet press comprises a rotor (not shown in detail) with a cavity plate 3 comprising an upper part and a lower part, the upper part and the lower part guiding upper and lower punches which engage in the cavities 4 and of which one punch 5 is shown by way of example in Fig. 2. In certain positions, the pressure stations, the upper and lower punches 5 are lowered and raised towards the cavity 4 by pressure rollers and in this way apply the tabletting pressure to the mixture to be tabletted. The punches 5 are then brought back into a position remote from the cavity plate, for example in the arrowed (arrow 6) region of the path of movement of the punches 5. An arrangement according to the invention generally denoted by the reference 7 may advantageously be arranged in the region 6.
In the illustrated embodiment (Fig. 1 ), the arrangement 7 according to the invention for cleaning the punches 5 of the rotary tablet press comprises two cleaning brushes 9 which are mounted for rotation in a housing 8, which may differ in diameter and of which the bristles preferably consist of plastic, although basically they may consist of any material with the proviso that this material should not scratch the compression surfaces of the punches 5. The cleaning brushes 9 are mounted for rotation in the housing 8 and are driven in opposite directions, as indicated by arrows 10 in Fig. 2. The arrangement of the cleaning brushes 9 is preferably such that the shafts 11 about which they rotate are substantially at a right-angle to the longitudinal axis 5a of the particular punch 5 to be cleaned. The shafts 11 of the cleaning brushes 9 are coupled to a gear unit 12 which is preferably integrated in the housing 8 and which is preferably driven by an electrical d.c. motor 13. The d.c. motor 13 comprises a motor housing 14, a motor fixing bracket 15, a holder 16 for the gear unit, a voltage supply 17 and a motor ventilation system 18. The motor may readily be fixed by its bracket 15 to a mounting rail 19 of the housing 8, the holder 16 for the gear unit being coupled to a gear coupling 20 of the gear unit 12.
The arrangement 7 additionally comprises a tube-like extraction system 21 which is disposed adjacent the cleaning brushes 9.
The gear unit 12 is preferably a spur gear and the gear holder 16 of the d.c. motor 13 is provided with a quick-action clamp. The brushes 9 can be driven at extremely high rotational speeds, for example at 30,000 r.p.m. Over its path of movement, the particular punch 5 of the rotary tablet press 1 comes into contact with the cleaning brushes 9 in a position remote from the cavity plate 3. The cleaning effect is radial and axial and is also staggered through the rotation of the cleaning brushes 9 in opposite directions. The brushes 9 clean themselves automatically through their rotation and the dust-like particles are carried away by the extraction system 21.
The d.c. motor 13 may be additionally provided with a processor cooler on the motor housing 14 although this is not shown.
The arrangement shown in Fig. 1 is extremely compact so that it is particularly well adapted to the cramped conditions in a rotary tablet press 1. For example, the length of the cleaning brushes is 9100 mm for a brush diameter of 25 mm, the length of the gear unit is about 50 mm and the installed length of the motor housing is 13,200 mm so that the overall length of the arrangement 7 is only about 350 mm.
The invention is not of course confined to the illustrated embodiment. Other embodiments are possible without departing from the basic concept. Thus, the arrangement 7 may also be driven by a remote motor via a flexible shaft. More than two cleaning brushes 9 may be provided, etc.
Claims (8)
1. An apparatus for cleaning the upper and/or lower punches of a rotary press, more particularly a rotary tablet press, comprising at least one rotatable cleaning brush which is positioned in the path of movement of the punches in a region of a cavity plate of the rotary press where the punches are situated in a position remote from the particular cavity.
2. An apparatus as claimed in claim 1, which comprises an extraction system disposed adjacent the at least one cleaning brush.
3. An apparatus as claimed in claim 1 or 2, wherein the at least one cleaning brush is arranged in such a way that a shaft about which it rotates is at substantially a right-angle to the longitudinal axis of the punches.
4. An apparatus as claimed in claim 1, 2 or 3, wherein at least two cleaning brushes driven in opposite directions are provided.
5. An apparatus as claimed in claim 4, wherein the cleaning brushes have different diameters.
6. An apparatus as claimed in claim 4 or 5, wherein the cleaning brushes are driven by a common motor via a gear system.
7. An apparatus as claimed in any of claims 1 to 6, wherein the motor is an electrical d.c. motor.
8. An apparatus as claimed in claim 6 or 7, wherein the cleaning brushes are arranged in a housing in which the gear system is integrated and to which the motor is adapted to be fixed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1999130626 DE19930626C2 (en) | 1999-07-02 | 1999-07-02 | Device for cleaning upper and / or lower punches on a rotary press |
| DE19930626.5 | 1999-07-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2313340A1 true CA2313340A1 (en) | 2001-01-02 |
Family
ID=7913475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2313340 Abandoned CA2313340A1 (en) | 1999-07-02 | 2000-07-04 | An arrangement for cleaning the upper and/or lower punches of a rotary press |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU6688100A (en) |
| CA (1) | CA2313340A1 (en) |
| DE (1) | DE19930626C2 (en) |
| WO (1) | WO2001002161A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104259118A (en) * | 2014-09-26 | 2015-01-07 | 天津中盛海天制药有限公司 | Flat effervescent tablet screening dust collection device |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10004421A1 (en) * | 2000-02-02 | 2001-08-09 | Bosch Gmbh Robert | Radio identification system and method |
| DE10316187B3 (en) | 2003-04-09 | 2004-10-21 | Bernhard Schäfer Werkzeug- und Sondermaschinenbau GmbH | Cleaning device for a device for crimping a crimp onto a cabal end |
| DE102007041260A1 (en) * | 2007-08-30 | 2009-03-05 | Henkel Ag & Co. Kgaa | Method and device for the production of tablets |
| CN113103651B (en) * | 2021-04-13 | 2023-07-21 | 陕西天竺饮品有限公司 | Quick compression equipment of easy open can |
| CN114027201B (en) * | 2021-11-15 | 2022-12-09 | 内蒙古美羊牧业科技有限公司 | Sheep pen |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE521535C (en) * | 1931-06-19 | Johann Spengler | Cleaning device for the upper and lower punch of rotary table presses | |
| US3332367A (en) * | 1965-07-15 | 1967-07-25 | Upjohn Co | Apparatus for making tablets |
| CH522489A (en) * | 1970-07-24 | 1972-06-30 | Italtrade | Press for the molding of plastic, rubber and similar materials |
| JPS5976207A (en) * | 1982-10-25 | 1984-05-01 | Kazuo Bando | Cleaning apparatus for surface of plastic molding metal die |
| DE3404108A1 (en) * | 1984-02-07 | 1985-08-14 | Kilian & Co GmbH, 5000 Köln | TABLET PRESS |
| JPS6427799A (en) * | 1987-07-21 | 1989-01-30 | Kikusui Seisakusho Ltd | Method for removing attachment to stamp tip face in rotary type powder compression forming machine |
| JPH10235634A (en) * | 1997-02-21 | 1998-09-08 | Sumitomo Kinzoku Electro Device:Kk | Cleaning apparatus for press mold |
-
1999
- 1999-07-02 DE DE1999130626 patent/DE19930626C2/en not_active Expired - Fee Related
-
2000
- 2000-06-23 AU AU66881/00A patent/AU6688100A/en not_active Abandoned
- 2000-06-23 WO PCT/EP2000/005814 patent/WO2001002161A1/en active Application Filing
- 2000-07-04 CA CA 2313340 patent/CA2313340A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104259118A (en) * | 2014-09-26 | 2015-01-07 | 天津中盛海天制药有限公司 | Flat effervescent tablet screening dust collection device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19930626A1 (en) | 2001-01-11 |
| WO2001002161A1 (en) | 2001-01-11 |
| AU6688100A (en) | 2001-01-22 |
| DE19930626C2 (en) | 2001-10-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |