EP3551380A1 - Collecteur de poussière pour une meuleuse angulaire - Google Patents

Collecteur de poussière pour une meuleuse angulaire

Info

Publication number
EP3551380A1
EP3551380A1 EP17805185.0A EP17805185A EP3551380A1 EP 3551380 A1 EP3551380 A1 EP 3551380A1 EP 17805185 A EP17805185 A EP 17805185A EP 3551380 A1 EP3551380 A1 EP 3551380A1
Authority
EP
European Patent Office
Prior art keywords
hood
hood body
dust hood
dust
inflow opening
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.)
Granted
Application number
EP17805185.0A
Other languages
German (de)
English (en)
Other versions
EP3551380B1 (fr
Inventor
Oliver Ohlendorf
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP3551380A1 publication Critical patent/EP3551380A1/fr
Application granted granted Critical
Publication of EP3551380B1 publication Critical patent/EP3551380B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools

Definitions

  • the present invention relates to a dust hood for a equipped with a Getriebehals for mounting the dust hood grinder.
  • the dust hood is equipped with a hood body for at least partially covering a circular grinding wheel and with a suction via which a background abrasion can be sucked out of the hood body.
  • a hood body connected to the suction Schoabsaugkanal is formed which extends tangentially to the grinding wheel and is located on a connection side of the hood body.
  • Dust hoods of the type mentioned are basically known from the prior art. They serve to prevent dust spreading during cutting operations in order to protect the health of a user of the cut-off grinder.
  • the object is achieved in that in one of the connection side opposite back of the hood body, an inflow opening is formed, via which ambient air can flow into the hood body in the separation operation.
  • the invention includes the realization that dust hoods of the prior art, although already have a relatively good extraction behavior, yet a significant reduction of fine dust concentration is desirable. It has been recognized that dust hoods of the prior art emit fine dust on the back of the hood body, since a background abrasion (fine dust) is typically not fully detected and carried away by the Hauptabsaugkanal.
  • the rear side of the hood body is to be understood as the side of the hood body on which the circular cutting disk, relative to the direction of rotation of the cutting disk, dips into the substrate to be separated.
  • connection side and the back can be opposite, with respect to a part plane, wherein the part plane is preferably clamped by the axis of rotation of the cutting disc and a straight line which runs parallel to the main suction channel extending tangentially to the cutting disc.
  • the dust hood according to the invention can be made significantly narrower than dust hoods of the prior art.
  • the inlet opening is provided in addition to a disc outlet opening of the hood body.
  • a disk outlet opening of the hood body means the opening of the hood body on which the circular cutting disk for the separation operation projects beyond the hood body.
  • the inlet opening according to the invention is different from this disc outlet opening. This has the advantage that the improved suction performance is achieved even with maximum immersed in the substrate cutting disc (full cut).
  • the inflow opening is formed as a slot.
  • the slot can open the hood body, relative to the cutting disc in the radial direction.
  • the inflow opening can open the hood body, with respect to the cutting disk, in the axial direction.
  • the inlet opening designed as a slot lies in a disk plane of the cutting disk. Also advantageously, the inflow opening is formed on an end face of the hood body.
  • the inflow opening can define a circular sector of at most 30 degrees.
  • the circular sector is related to the rotational direction of the cutting disk along an end face of the hood body.
  • a width of the inflow opening is at most half as large as a hood body width on the rear side of the hood body.
  • the widths are determined in the axial direction. It has proven to be advantageous if the Hauptabsaugkanal is divided by a hood web into two suction chambers, which are preferably symmetrical to each other.
  • the hood web can lie in a disk plane of the cutting disk.
  • the object is likewise achieved by a cut-off grinder, in particular a diamond cut-off grinder, with a gear neck and with a dust hood of the type described above, wherein the dust hood is arranged or to be arranged on the gear neck.
  • FIG. 1 shows a grinding device on which a dust hood according to a preferred
  • Embodiment of the invention is arranged;
  • FIG. 2 is a perspective view of the dust hood of FIG. 1;
  • FIG. 3 is a schematic sectional view of the embodiment of FIGS. 1 and 2 for clarifying the flow conditions.
  • Fig. 4 is a sectional view through the embodiment of Figures 1 to 3 for
  • FIG. 1 shows a dust hood 100 according to the invention, which is arranged on a cut-off grinder 200.
  • the cut-off grinder 200 has a gear neck 210, to which the dust hood 100 is fastened.
  • the dust hood 100 is equipped with a hood body 10 for at least partially covering a circular cutting disk 220.
  • the cutting disk 220 is mounted on a drive spindle 230 of the cutting machine 200 or mounted.
  • the dust hood 100 also has a suction connection 40, via which a background removal (cf., FIG. 3, background removal S) can be extracted from the hood body 10.
  • the suction port 40 is connected to a Schoabsaugkanal 50 which is formed in the hood body 10.
  • the Hauptabsaugkanal 50 extends in the tangential direction T to the cutting disc 220 and is located on a connection side AS of the hood body 10.
  • an inflow opening 60 is formed, via which ambient air (see FIG. 3 ambient air UL) can flow into the hood body 10 during the separation operation.
  • connection side AS and the rear side RS are opposite to a part plane TE opposite.
  • the part plane TE is spanned by the rotation axis RA of the cutting disk 220 and a straight line G which runs parallel to the main suction channel 50 extending tangentially to the cutting disk 220.
  • the inflow opening 60 is provided in addition to a pulley outlet opening 70 of the hood body 10.
  • the circular cutting disk 220 except for its share in the area of the disk outlet opening 70, is completely enclosed. With respect to the radial direction RR, the circular cutting disk 220 does not come out of the inflow opening 60 at the rear side RS of the hood body.
  • the inflow opening 60 is formed as a slot which opens the hood body 10, relative to the separating disc 220, in the radial direction RR.
  • the inlet opening 60 designed as a slot lies at least partially in a disk plane SE of the cutting disk 220 (represented in FIG. 1 by the normal arrow of the disk plane SE).
  • the inflow opening 60 which is formed as a slot, is formed on an end face 15 of the hood body 10.
  • the Hauptabsaugkanal 50 is further divided by a hood web 20 into two suction chambers 30, 30 ', which are symmetrical to each other in the presently illustrated embodiment.
  • the hood web 20 lies in the disk plane SE of the cutting disk 220.
  • Fig. 2 the dust hood of Fig. 1 is shown in a perspective view.
  • the inlet opening 60 designed as a slot and arranged on the rear side RS of the hood body 10 can be clearly seen.
  • the dashed lines in Fig. 2 indicated circular cutting disk 220 is immersed in the substrate U maximum.
  • the disk outlet opening 70 of the hood body 10 is on the ground U on.
  • a width BS of the inflow opening 60 is at most half as large as a hood body width BH on the rear side RS of the hood body 10.
  • the width BS and the hood body width BH are each related to the axial direction AR.
  • FIG. 3 now shows a sectional view of the dust hood 100 of FIG. 2, which is located in full section.
  • the circular cutting disk 220 is immersed in the substrate U to a maximum extent.
  • the cutting disk 220 is in the separating operation, is therefore driven in the direction of rotation R, at the same time a suction power is provided via the suction port 40.
  • a background removal S which originates from the substrate U, is extracted via the main suction channel 50, which extends tangentially to the separator disk 220, and the suction connection 40.
  • the largest portion of the extracted air passes through a primary flow path PP, which is shown in Fig. 3 in the form of solid arrowed lines.
  • a primary flow path PP which is shown in Fig. 3 in the form of solid arrowed lines.
  • high-concentration air is conveyed through the main suction passage 50 toward the suction port 40.
  • a part of the primary flow path PP runs through the inflow opening 60 formed according to the invention on the rear side RS of the hood body 10. This is illustrated in FIG. 3 by the ambient air UL entering into the inflow opening 60.
  • a secondary flow path SK is further induced, represented in FIG. 3 by the dashed and arrowed line, which flows through a secondary flow area SB.
  • the secondary flow area is defined by the air gap between the end face 15 of the hood body 20 and the outer circumference of the circular cutting disk 220
  • Driving the circular blade 220 in the direction of rotation R generates a vortex field in which a relatively low concentration of subsurface S prevails.
  • the secondary flow path SK is guided on the primary flow path PP when leaving the secondary flow area SB, more precisely in the region of the inflow opening 60.
  • background erosion S which has not been sucked through the original primary flow path PP in the direction of the suction port 40, can now be "collected” and sucked in.
  • escape of "lost” particles is thus effectively avoided. This improves, as already mentioned, the cooling of the cutting disc 220 and allows higher cutting speeds, and tool life.
  • FIG. 4 shows the dust hood 100 of FIG. 3, wherein flow paths are not shown.
  • the inflow opening 60 designed as a slot is formed on a rear side RS of the hood body 10.
  • the rear side RS is located, relative to the part plane TE, opposite the connection side AS.
  • the inflow opening 60 with respect to the direction of rotation R of the cutting disk 220 and along the end face 15 of the hood body 10, is limited by a circular sector KS of at most 30 degrees.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

L'invention concerne un collecteur de poussière (100) pour une meuleuse angulaire (200) pourvue d'un prolongement de carter (210) pour la fixation du collecteur de poussière (100), comprenant un corps de collecteur (10) servant à recouvrir au moins par endroits les deux faces d'une meule tronçonneuse (220) circulaire, et un raccord d'aspiration (40) permettant d'aspirer la matière (S), enlevée du substrat, hors du corps de collecteur (10), un canal d'aspiration principal (50) relié au raccord d'aspiration (40), s'étendant tangentiellement à la meule tronçonneuse (220) et se trouvant sur un côté de raccordement (AS) du corps de collecteur (10), étant formé dans le corps de collecteur (10). Une ouverture d'entrée (60), permettant, en mode meulage, l'entrée d'air ambiant (UL) dans le corps de collecteur (10) est ménagée dans un côté arrière (RS), opposé au côté de raccordement (AS), du corps de collecteur (10).
EP17805185.0A 2016-12-06 2017-11-28 Capot anti-poussière pour une tronçonneuse Active EP3551380B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16202347.7A EP3332909A1 (fr) 2016-12-06 2016-12-06 Capot anti-poussière pour une tronçonneuse
PCT/EP2017/080601 WO2018104103A1 (fr) 2016-12-06 2017-11-28 Collecteur de poussière pour une meuleuse angulaire

Publications (2)

Publication Number Publication Date
EP3551380A1 true EP3551380A1 (fr) 2019-10-16
EP3551380B1 EP3551380B1 (fr) 2023-01-04

Family

ID=57544224

Family Applications (2)

Application Number Title Priority Date Filing Date
EP16202347.7A Withdrawn EP3332909A1 (fr) 2016-12-06 2016-12-06 Capot anti-poussière pour une tronçonneuse
EP17805185.0A Active EP3551380B1 (fr) 2016-12-06 2017-11-28 Capot anti-poussière pour une tronçonneuse

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP16202347.7A Withdrawn EP3332909A1 (fr) 2016-12-06 2016-12-06 Capot anti-poussière pour une tronçonneuse

Country Status (3)

Country Link
EP (2) EP3332909A1 (fr)
DK (1) DK3551380T3 (fr)
WO (1) WO2018104103A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3736086A1 (fr) * 2019-05-07 2020-11-11 Hilti Aktiengesellschaft Dispositif de hotte aspirante des poussières pour un appareil-outil ainsi que son utilisation et son procédé d'aspiration des poussières
CN116100443A (zh) * 2022-12-07 2023-05-12 许春雷 一种具有防护结构的开槽预操作演示刻线专用砂轮机及防护方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8381711B2 (en) * 2009-06-16 2013-02-26 Dustless Depot, Llc Universal dust collection shroud for high speed gas powered saws
JP6111382B2 (ja) * 2012-01-24 2017-04-12 株式会社 アクティブ 鉄筋コンクリートの切削方法
DE202015006749U1 (de) * 2015-09-26 2015-11-09 Ralf Biedron Zweikanal Saugstutzen für Universal Absaughaube

Also Published As

Publication number Publication date
EP3332909A1 (fr) 2018-06-13
WO2018104103A1 (fr) 2018-06-14
EP3551380B1 (fr) 2023-01-04
DK3551380T3 (da) 2023-02-06

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