EP0334124A2 - Broyeur - Google Patents

Broyeur Download PDF

Info

Publication number
EP0334124A2
EP0334124A2 EP89104287A EP89104287A EP0334124A2 EP 0334124 A2 EP0334124 A2 EP 0334124A2 EP 89104287 A EP89104287 A EP 89104287A EP 89104287 A EP89104287 A EP 89104287A EP 0334124 A2 EP0334124 A2 EP 0334124A2
Authority
EP
European Patent Office
Prior art keywords
housing
mill
air
filter
mill according
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.)
Withdrawn
Application number
EP89104287A
Other languages
German (de)
English (en)
Other versions
EP0334124A3 (fr
Inventor
Siegfried Dr. Agr. Dipl.-Landwirt Heilenz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0334124A2 publication Critical patent/EP0334124A2/fr
Publication of EP0334124A3 publication Critical patent/EP0334124A3/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/288—Ventilating, or influencing air circulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/04—Safety devices

Definitions

  • the invention relates to a mill with a grinder driven by a motor and connected to an inlet funnel and a collecting container.
  • Mills of the type mentioned at the outset are used in particular in the laboratory to crush samples, which are then subjected to a chemical analysis. It proves necessary to be particularly careful when comminuting the respective substances, since the preparation of the sample substance has a decisive influence on the results of the analysis. When using the most modern analytical methods, the amount of material required can be greatly reduced. This leads to shorter sample preparation times and considerable material savings. It proves to be disadvantageous that the requirements for comminution, ie. H. the grinding of the samples increases considerably since the substances to be analyzed have to be very finely divided. The required grain sizes are usually less than 0.1 mm. Since the substances to be ground are usually pre-dried, the fine grinding and pre-drying of the substances result in a considerable amount of dust.
  • the invention has for its object to provide a mill of the type mentioned, which minimizes the amount of dust released with a simple structure and reliable, easy to use.
  • the object is achieved in that the mill is arranged in a housing which has at least one air inlet opening and an air outlet, that the air outlet is arranged on the bottom of the housing and connected to a vacuum source and that a filter is provided in the area of the air outlet, which can be connected to an air source acting on the filter in the counterflow direction with compressed air.
  • the mill according to the invention is characterized by a number of significant advantages.
  • the arrangement in the housing makes it possible to safely collect the dust escaping due to leaks between the individual components of the mill. It is also possible to open the grinder inside the housing, for example to clean the grinder.
  • the connection of the air outlet with a vacuum source ensures that there is always sufficient air flow through the housing, which leads the dust particles to the filter of the air outlet in a safe manner which they get stuck at least in part and are filtered out.
  • the filter in the area of the air outlet is provided to prevent excessive dust pollution of the vacuum source.
  • the mill according to the invention thus ensures that no dust can escape into the working space during the grinding process. It is thus possible to use the mill in conventional laboratory rooms, whereas in the prior art it was necessary to operate the mill in a separate room because of the strong dust generation.
  • the regeneration of the filter according to the invention by means of counter-flowing compressed air must be carried out after 5 at the earliest, usually only after 10 or more grinding cycles. It guarantees a uniformly high level of dust extraction from the housing and multiplies the service life of the vacuum source. Since the dust collector located there is beyond direct observation. As a result, experience has shown that this becomes ineffective after a short period of operation due to overfilling, which leads to the failure of the vacuum source and thus to the suction.
  • the housing of the mill according to the invention is always flowed through by an air flow, the risk of a dust explosion is avoided. It is also possible to effectively dampen the noise generated by the mill through the housing. In addition, the material loss that occurs occurs on a Reduced to a minimum, since when the collection container is subsequently removed, no air flow has to be present in the work space for the purpose of ventilation.
  • the mill according to the invention is preferably designed such that the dust-laden air in the housing is exchanged for fresh air at least once per second.
  • the vacuum source is designed in the form of a suction device provided with a dust separator, the suction device being able to be designed in the form of a commercially available vacuum cleaner. Since a separate, regenerable filter is provided in the area of the air outlet on the housing, it is ensured that only a small amount of dust gets into the suction device, so that its dust separator only has to be cleaned at larger time intervals, e.g. B. once a year.
  • the air inlet opening for generating an air flow directed towards the bottom of the housing is preferably arranged in the upper housing region. This configuration ensures that the dust particles are supplied to the floor area and some are already deposited directly on the floor without reaching the filter of the air outlet.
  • the housing To clean the interior of the housing, it is advantageously provided with a closable, slot-shaped opening for introducing a compressed air lance.
  • a compressed air lance Using the compressed air lance, it is possible to blow off both the grinder of the mill after it has been opened and the inner walls of the housing and to free it from adhering dust and residues. The material loosened during this cleaning is sucked in through the vacuum source and the filter of the air outlet.
  • the compressed air lance can advantageously be designed in such a way that, in conjunction with a suitable arrangement of the opening in the housing, it is not possible to insert the compressed air lance into the grinder of the mill. It is thus avoided that after the mill motor has been switched off, the rotor which is still running for a long time can be touched by the lance. This eliminates the possibility of damage and any danger to the operating personnel. The possibility of being able to start cleaning while the rotor is still running not only significantly shortens the work process, but also increases the cleaning effect.
  • the housing comprises, from the outside, actuatable devices for opening the mill and for removing the collecting container.
  • the inlet funnel is usually pivoted away together with a cover part to open the grinder.
  • this opening is at least partially covered by a perforated plate .
  • the perforated plate is designed so that only a certain amount of air can be sucked into the housing.
  • Another favorable embodiment of the mill is given in that the collecting container is opened to the interior of the housing via a filter.
  • This filter causes the low negative pressure of the interior of the housing to continue into the collecting container.
  • the air flow compensating for this negative pressure enters the mill at the filling funnel and reaches the collecting container via the inside of the mill - taking the grinding dust that is created here.
  • the narrow filter pores hardly allow regrind to pass through. This prevents a build-up of dust inside the mill, which could lead to dust loss through the filling funnel into the environment if the grinding is very dusty (e.g. from earth).
  • the housing is provided with air inlet openings in the region of its corners and edges. Since a defined air flow can always enter through these air inlet openings, it is prevented that larger amounts of dust settle in these corners or edges.
  • the filter of the air outlet is preferably cleaned by means of a flushing pipe which is displaceably arranged on the housing in an outlet chamber and which can be pressurized. Since the flushing pipe can be moved, it is possible to selectively apply air to the filter in order to free it from adhering dust particles over its entire cross-sectional area.
  • FIG. 1 shows a side view of an exemplary embodiment of a mill 1 according to the invention which is arranged in a housing 6 and has a motor 2 which is mounted outside the housing 6.
  • the mill 1 has an inlet funnel 3, through which material to be comminuted is fed to a grinder 5, not shown in FIG. 1.
  • the grinder 5 comprises in the usual way a cross, which can be driven by the motor 2, and an inner wall provided with projections or corrugations. After comminution in the grinder 5, the comminuted material arrives in a collecting container 4, which can be detached from the mill 1 in order to remove its contents.
  • a cover 16 on which the inlet funnel 3 is provided is pivoted away from the housing of the mill.
  • the housing 6 has at its upper area an opening, not shown in detail, which is assigned to the inlet funnel 3 in its operating position in order to introduce regrind into the mill 1.
  • a perforated plate 12 is arranged on the upper area of the housing 6, which covers the opening of the housing at least in part.
  • the pivot lever 17 is arranged outside the housing 6, so that the cover 16 can be opened without the housing 6 having to be opened by the operator.
  • a threaded rod 19 is provided, the front end of which is provided with a thread and can be passed through a recess in the cover and screwed to the housing and / or the mill.
  • a crank 20 is arranged outside the housing 6 and is connected to the threaded rod 6.
  • the threaded rod 19 is displaceable in its longitudinal direction, so that it can be removed from the housing 6 or at least partially pulled out after opening to open it to enable the lid 16.
  • FIG. 2 shows a top view of the arrangement shown in FIG. 1, the housing 6 being shown in section.
  • a limit switch 21 is provided on the housing 6, which is actuated when the threaded rod 19 is completely screwed in.
  • the limit switch 21 serves as a safety switch and prevents the engine 2 from starting as long as the cover 16 is not closed.
  • the perforated plate 12 is also shown, through which the opening of the inlet funnel 3 in the housing 6 can be at least partially closed when the lid 16 is open.
  • FIG. 3 shows a sectional view along the line III-III of FIG. 2.
  • the opening 22 of the housing 6 assigned to the inlet funnel 3 is particularly clearly visible, as is the perforated plate 12.
  • a main switch 23 is provided, by means of which the motor 2 can be switched on or off.
  • an eccentric 24 is provided on the bottom area thereof, which is attached to a shaft 26 which is mounted in the housing 6 and extends through the walls thereof. At the ends of the shaft 26 a rotary handle 27 is provided, by means of which the shaft 26 and thus also the eccentric 24 can be rotated in order to raise or lower the collecting container 4.
  • a lever 28 is attached to the shaft 26 and is engageable with a limit switch 25 attached to the housing 6 to ensure that the engine 2 cannot be started until the collecting container 4 is properly connected to the mill 1.
  • the lower region of the housing 6 is provided with a front plate 30, which is connected to a handle 29 and can be opened to remove the collecting container 4.
  • the collecting container 4 has an opening which is covered by a filter 13.
  • the filter 13 can be designed in the form of a close-meshed network or grid sheet and which hardly allows the finest dust particles to escape from the collecting container.
  • the housing is also provided with an air outlet 8, which is arranged in the bottom region (see FIG. 3) and serves for the outflow of air from the interior of the housing 6.
  • the air flows through a filter 9 into an outlet chamber 14, which is connected in a manner not shown to a vacuum source, for example a vacuum cleaner.
  • the air outlet 8 is slit-shaped in order to allow a smooth, undisturbed inflow of air into the outlet chamber 14.
  • the filter 9 is held on the housing 6 by means of screws 31.
  • a flushing pipe 15 provided, which is displaceable in the vertical direction along a rail 32 and is connected to an air duct 34 via a line 33. Compressed air is supplied through the air duct 34 in order to flow through the filter 9 in the counterflow direction.
  • the displaceability of the rinsing tube 15 makes it possible to deliberately remove dust particles from the entire surface of the filter 9. The dust particles thus blown off fall through the air outlet 8 into the bottom region of the housing 6 and can be removed there manually when the front plate 30 is open.
  • the outlet chamber 14 is preferably provided with a vacuum outlet 35 at its upper region in order to ensure a uniform flow through the outlet chamber 14.
  • FIG. 4 shows a view along the line IV-IV of FIG. 3, i. H. a side view of the side of the mill shown on the right in Fig. 3.
  • Fig. 4 shows an open state of the mill 1, in which the cover 16 has been pivoted away after the threaded rod 19 has been unscrewed.
  • part of the grinder 5, namely the corrugation or toothing of the cover 16 is visible.
  • the collecting container 4 was rotated by rotating the shaft 26, i. H. lowered by pivoting the eccentric 24 so that the collecting container 4 can be removed from the housing 6.
  • the front panel 30 has been moved down.
  • the filter 13 of the collecting container 4 preferably has a mesh size of 10 ⁇ m and is arranged in a bore with a diameter of 50 mm.
  • the filter 13 also creates a slight negative pressure in the collecting container 4, which prevents dust from escaping through the inlet funnel 3 and the opening 22 of the housing 6 when the mill 1 is in operation.
  • the perforated plate 12 is dimensioned with respect to the cross sections of its openings so that although a sufficient amount of air can flow into the interior of the housing 6, on the other hand, the free cross sections of the perforated plate 12 prevent an excessive amount of air from flowing in, which are no longer extracted by the vacuum source could, which could then leak dust from the housing 6.
  • the housing 6 has a slot-shaped opening 11 through which a compressed air lance, not shown, can be introduced into the interior of the housing 6 in order to free the grinder 5 of the mill 1 from dust and with the cover 16 open to clean.
  • the compressed air lance has, for example, lateral bores of 2 mm in diameter and is connected to an overpressure source of 7 bar in order, for example, to blow an air quantity of 25 l into the housing 6.
  • the amount of air blown in must be less than the amount of air extracted by the vacuum source.
  • cooling of the grinder 5 of the mill 1 occurs during this cleaning.
  • the design of the outlet chamber 14, the air outlet 8 and the filter 9 has the effect that the air laden with fine dust first passes through the air outlet 8 at a relatively high flow rate and is then slowed down to approximately 1/20 of the rate in order to settle to enable the dust particles on the filter 9.
  • the filter 9 is, for example, in the form of a steel mesh with a mesh size of 25 ⁇ m and is cleaned by means of the rinsing tube 15 after five to ten grinding processes. During the cleaning process, the vacuum source is still connected to the housing 6, but the amount of air blown in through the flushing pipe 15 is dimensioned such that the filter 9 can nevertheless be flowed through in countercurrent. For this purpose it is in the upper In the region of the outlet chamber 14, an opening is provided which is opened when the flushing pipe is raised and causes the vacuum source to draw in outside air at least in part.
  • the housing 6 has, for example, an internal volume of 50 l, so that a commercially available vacuum cleaner can be used as the vacuum source. Since the fine dust is retained on the filter 9, an overload or increased contamination of the vacuum cleaner is prevented.
  • the suction is advantageously dimensioned such that an air exchange in the housing 6 takes place at least once per second.
  • the air outlet 8 has a cross-sectional area of about 20 cm 2, while the filter 9 has an area of about 400 cm 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Disintegrating Or Milling (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Crushing And Grinding (AREA)
  • Road Repair (AREA)
EP89104287A 1988-03-25 1989-03-10 Broyeur Withdrawn EP0334124A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8804036U 1988-03-25
DE8804036U DE8804036U1 (de) 1988-03-25 1988-03-25 Mühle

Publications (2)

Publication Number Publication Date
EP0334124A2 true EP0334124A2 (fr) 1989-09-27
EP0334124A3 EP0334124A3 (fr) 1990-06-20

Family

ID=6822281

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89104287A Withdrawn EP0334124A3 (fr) 1988-03-25 1989-03-10 Broyeur

Country Status (3)

Country Link
US (1) US4988046A (fr)
EP (1) EP0334124A3 (fr)
DE (1) DE8804036U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10306652B4 (de) * 2003-02-18 2014-05-15 Hartwig Straub Treibstrahl, um Ablagerungen in gefahrdrohender Menge auszuschließen

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10054028A1 (de) * 2000-10-31 2002-05-08 Kraemer & Grebe Kg Sicherheitssysteme für Zerkleinerungsmaschinen
US7648093B2 (en) * 2007-03-27 2010-01-19 Dennis Kruger Pill crusher and pill pouch
US20140097280A1 (en) * 2007-04-27 2014-04-10 Jesus Perez Santafe Garbage container for collection of solid waste
FI124321B (fi) * 2011-12-02 2014-06-30 Ilpo Kröger Laite ja menetelmä käytöstä poistettujen lääkkeiden käsittelemiseksi
IT201800006648A1 (it) * 2018-06-26 2019-12-26 Dispositivo per la macinazione di un materiale solido

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2407722A (en) * 1944-09-18 1946-09-17 Kingsburg Cotton Oil Co Dust collector
FR1197496A (fr) * 1958-06-30 1959-12-01 Maurice Rousselle & Fils Perfectionnements aux broyeurs à marteaux
GB2019742A (en) * 1978-04-18 1979-11-07 Simon Barron Ltd Grinding mill
US4426042A (en) * 1980-10-16 1984-01-17 Mineral Processing Systems, Inc. Method of shredding solid waste
EP0178143A2 (fr) * 1984-10-09 1986-04-16 Medical Safetec Inc. Système de destruction des ordures d'hôpital

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3444709C2 (de) * 1984-12-07 1996-05-30 Gao Ges Automation Org Vorrichtung zum Vernichten von Banknoten

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2407722A (en) * 1944-09-18 1946-09-17 Kingsburg Cotton Oil Co Dust collector
FR1197496A (fr) * 1958-06-30 1959-12-01 Maurice Rousselle & Fils Perfectionnements aux broyeurs à marteaux
GB2019742A (en) * 1978-04-18 1979-11-07 Simon Barron Ltd Grinding mill
US4426042A (en) * 1980-10-16 1984-01-17 Mineral Processing Systems, Inc. Method of shredding solid waste
EP0178143A2 (fr) * 1984-10-09 1986-04-16 Medical Safetec Inc. Système de destruction des ordures d'hôpital

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10306652B4 (de) * 2003-02-18 2014-05-15 Hartwig Straub Treibstrahl, um Ablagerungen in gefahrdrohender Menge auszuschließen

Also Published As

Publication number Publication date
DE8804036U1 (de) 1988-05-19
US4988046A (en) 1991-01-29
EP0334124A3 (fr) 1990-06-20

Similar Documents

Publication Publication Date Title
EP0211383A1 (fr) Filtre
EP2734098B1 (fr) Balayeuse avec conteneur sous pression pour le nettoyage du filtre
EP3257821A1 (fr) Dispositif mobile d'épuration d'eaux usées provenant du nettoyage de façades
DE202016106569U1 (de) Staubsauger mit der Funktion zum Recyleln von am Siebkorb anhaftenden Staubteilchen
EP0753612A1 (fr) Appareil d'aspiration manuel pour le nettoyage de machines
CH677935A5 (fr)
EP0334124A2 (fr) Broyeur
DE661573C (de) Staubsauger fuer Blas- und Saugluftbetrieb
DE202007018680U1 (de) Filtervorrichtung für einen Reinraum
EP2613893B1 (fr) Système de nettoyage de contenants et procédé de nettoyage
WO2020187461A1 (fr) Dispositif d'encollage à chaud pour une étiqueteuse comprenant une aspiration
EP0702838B1 (fr) Installation de decontamination d'une surface contaminee par voie radioactive
DE4107982A1 (de) Verfahren und vorrichtung zum beseitigen von tritium aus verseuchten objekten
EP0598246B1 (fr) Lieu de travail avec une table de travail et une installation d'aspiration pourvue d'un dispositif de filtrage
DE19509432C2 (de) Absaugvorrichtung, insbesondere für Zahntechniker-Arbeitsplätze
DE2051576B2 (de) Einrichtung zur behandlung von einaescherungsrueckstaenden in krematorien und anschliessendem urnenfuellen
EP0594213B1 (fr) Installation de filtrage pour un milieu gazeux
DE69013140T2 (de) Staubsammelsystem mit off-line-filterreinigung.
DE10034269A1 (de) Vorrichtung zur Reinigung von Müllbehältern
DE19620252C2 (de) Austauschbares Filterelement für Sicherheitswerkbänke in Krankenhäusern, Apotheken, Forschungslabors o. dgl.
DE3939645A1 (de) Staubabscheider mit schlauchfoermigen filterelementen
DE102006009965B4 (de) Absaug-Anlage für eine spanabhebende Bearbeitungs-Maschine
DE3037860A1 (de) Gasfilter
DE7401147U (de) Handbedienbares Absauggerät
DE4413243A1 (de) Staub- und Wassersauger

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19901002

17Q First examination report despatched

Effective date: 19911016

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19931001