EP4368339B1 - Schleifmaschine für elektrowerkzeug und schleifscheibenabdeckung - Google Patents

Schleifmaschine für elektrowerkzeug und schleifscheibenabdeckung

Info

Publication number
EP4368339B1
EP4368339B1 EP22206557.5A EP22206557A EP4368339B1 EP 4368339 B1 EP4368339 B1 EP 4368339B1 EP 22206557 A EP22206557 A EP 22206557A EP 4368339 B1 EP4368339 B1 EP 4368339B1
Authority
EP
European Patent Office
Prior art keywords
grinding disc
port
release port
electric tool
cover
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.)
Active
Application number
EP22206557.5A
Other languages
English (en)
French (fr)
Other versions
EP4368339A1 (de
Inventor
Bach Pangho Chen
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.)
Xpole Precision Tools Inc
Original Assignee
Xpole Precision Tools Inc
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 Xpole Precision Tools Inc filed Critical Xpole Precision Tools Inc
Priority to EP22206557.5A priority Critical patent/EP4368339B1/de
Publication of EP4368339A1 publication Critical patent/EP4368339A1/de
Application granted granted Critical
Publication of EP4368339B1 publication Critical patent/EP4368339B1/de
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
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • 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

Definitions

  • the invention relates to an electric tool grinding machine, particularly to an electric tool grinding machine with a grinding disc cover capable of guiding airflow outlet direction, and the grinding disc cover is without lateral vent hole.
  • An existing electric tool grinding machine is generally attached with an airflow generating member to an eccentric block to which the tool grinding machine belongs, so as to generate heat dissipation airflow through the airflow generating member, and discharge waste heat generated by the electric tool grinding machine during operation.
  • One such embodiment is as provided in European Patent No. EP2132000B1 , or as depicted in FIG. 1 .
  • a grinding disc cover 61 of an electric tool grinding machine 60 is provided with vent holes 611 arranged at intervals in a lateral direction, an airflow generating member 62 is disposed close to the vent holes 611, and at the same time close to a port of the grinding disc cover 61 connected to a grip body 63.
  • the airflow generating member 62 when the airflow generating member 62 rotates, the airflow generating member 62 introduces air through the vent holes 611 for heat dissipation.
  • the vent holes 611 are spaced apart from one another and the airflow generating member 62 is too close to the vent holes 611, the vent holes 611 cannot produce the expected effect in practice.
  • an adjacent one of the vent holes 611 discharges air, resulting in a short flow problem (also known as short cycle), as shown in FIG. 2 .
  • short flow problem also known as short cycle
  • waste heat can be exhausted as the eccentric block is connected to an electric motor 64
  • a diameter of a shaft of the eccentric block connecting with the electric motor 64 is generally small, and the waste heat transfer speed is not as fast as the speed of heat generated by the electric motor 64 itself, resulting in continuous accumulation of waste heat, which affects the user's feeling when holding and using the electric tool grinding machine 60.
  • the outside air is sucked in through the plurality of air inlet holes 631 by rotation of the airflow generating member 62 to form a heat dissipation airflow.
  • the airflow generating member 62 has the problem of poor air intake efficiency and cannot generate suction that meets the requirements.
  • air volume of the heat dissipation airflow is insufficient to effectively dissipate heat from the electric motor 64, and therefore the problem of waste heat accumulation of the electric motor 64 is still serious.
  • the above-mentioned structure is originally expected to enhance heat exchange with the electric motor 64 through a large air volume, but the conventional solution does not take fluid mechanics of the grinding disc cover 61 into consideration, which arranges the grinding disc cover 61 only to provide the function of shielding a grinding disc 65.
  • An inner wall of the existing grinding disc cover 61 is an inclined surface, and an end of the inclined surface faces the grinding disc 65.
  • the above-mentioned design will cause the heat dissipation airflow to be discharged directly to the grinding disc 65, the heat dissipation airflow impacting the grinding disc 65 will cause turbulence in the grinding disc cover 61, turbulence will affect the exhaust air, and results in failure in achieving the originally expected large air volume.
  • an air inlet of the active dust suction structure 71 is a suction port 721 formed on a grinding disc cover 72.
  • the active dust suction structure 71 generates suction in a space in the grinding disc cover 72, the aforementioned suction is obviously greater than the suction generated by an airflow generating member 73, and also a large amount of air sucked in through a plurality of air inlets 741 on a grip body 74 contributes greatly to heat dissipation of an electric motor 75.
  • US2022297254A1 discloses a grinding machine tool for reducing hotness of a casing, including a casing and a drive assembly.
  • the casing is divided into a head and a body; includes casing parts; includes an air inlet provided on the body and an air outlet provided on a side of the head; and forms a motor cover on the head, and the motor cover does not contact the casing parts to form an airflow passage in the casing.
  • the drive assembly includes a circuit board, a motor placed into the motor cover, and an airflow generating member rotating synchronously with the motor.
  • the airflow generating member When the airflow generating member rotates, it generates a first heat dissipation airflow passing through the airflow passage and dissipating heat of the circuit board and the head, and a second heat dissipation airflow dissipating heat on a side of the motor facing the airflow generating member.
  • US2005170763A1 discloses a pneumatic buffing machine including a housing having an internal chamber in which a pneumatically driven motor set is mounted.
  • the motor set includes an eccentric block for driving a grinding disc.
  • a skirt shade is screwed under a bottom of the housing by means of outer thread and inner thread.
  • the skirt shade has a large diameter section and a small diameter section.
  • the skirt shade is formed with a central through hole.
  • the eccentric block of the motor set is passed through the through hole and accommodated in the large diameter section.
  • a shoulder section is formed between the large diameter section and the small diameter section and adjacent to the outer thread of the small diameter section.
  • a top end of the small diameter section serves as a stopper section.
  • a main object of the invention is to solve the consequence of the conventional grinding disc cover on a heat dissipation airflow.
  • a secondary object of the invention is to solve the problem that heat accumulated in an electric motor of the conventional electric tool grinding machine cannot be easily discharged.
  • the invention provides an electric tool grinding machine including a grip body, an electric motor, an eccentric block, a grinding disc, an airflow generating member, and a grinding disc cover.
  • the grip body is formed with at least one air intake hole.
  • the electric motor is disposed in the grip body.
  • the eccentric block is connected to the electric motor and rotates with the electric motor.
  • the grinding disc is assembled with the eccentric block.
  • the airflow generating member is attached on the eccentric block. When the electric motor rotates, the airflow generating member forms a heat dissipation airflow in the grip body.
  • the grinding disc cover is assembled with the grip body and covers the airflow generating member therein.
  • the grinding disc cover includes a cover body, an assembly port formed at an end of the cover body and assembled with the grip body, and a release port formed at an other end of the cover body and facing the grinding disc.
  • the cover body is devoid of a vent hole other than the assembly port and the release port.
  • the release port is the only exhaust part of the grinding disc cover.
  • an inner wall of the release port sequentially includes a flow guiding section, an arcuate diversion section, and an air outlet section with a slope different from a slope of the flow guiding section.
  • the arcuate diversion section divertes an airflow direction of the heat dissipation airflow discharged between the grinding disc cover and the grinding disc to be parallel to the grinding disc.
  • the airflow generating member includes a baseplate and a plurality of fan blades separated provided on the baseplate, a distance defined between a top edge of each of the plurality of fan blades and the grip body is greater than 50% of a longitudinal length of each of the plurality of fan blades, and a distance defined between an outer edge of each of the plurality of fan blades and the grinding disc cover is greater than 50% of a radial length of each of the plurality of fan blades.
  • a horizontal level of the release port is equal to or lower than a horizontal level of the baseplate inside the grinding disc cover.
  • a distance defined between the release port and each of the plurality of fan blades is greater than a radial length of each of the plurality of fan blades.
  • the cover body includes an inclined surface between the assembly port and the release port, the inclined surface is connected with the flow guiding section of the release port, and a slope of the flow guiding section is same as a slope of the inclined surface.
  • a horizontal level of a top end of the inclined surface is same as or higher than a horizontal level of each of the plurality of fan blades.
  • the invention further provides a grinding disc cover of an electric tool grinding machine including a cover body, an assembly port formed at an end of the cover body, and a release port formed at an other end of the cover body and coaxially disposed with the assembly port.
  • a diameter of the release port is greater than a diameter of the assembly port, when the release port being viewed from a direction of the assembly port toward the release port, an inner wall of the release port sequentially includes a flow guiding section, an arcuate diversion section, and an air outlet section with a slope different from a slope of the flow guiding section.
  • the cover body is devoid of a vent hole other than the assembly port and the release port.
  • the cover body includes an inclined surface between the assembly port and the release port, the inclined surface is connected with the flow guiding section of the release port, and a slope of the flow guiding section is same as a slope of the inclined surface.
  • the cover body includes an engaging ring formed around the assembly port, and a continuous concave-convex structure is formed on an inner side of the engaging ring.
  • the invention has the following features: the grinding disc cover of the invention has an attached effect (also known as the Coand ⁇ effect) on an inner wall of the release port, so that the heat dissipation airflow is not discharged directly toward the grinding disc to avoid turbulence and to make the heat dissipation airflow to flow smoothly. Further, due to smooth discharge of the heat dissipation airflow, the heat dissipation airflow generated in the electric tool grinding machine is increased, which solves the problem that it is not easy to dissipate heat from the electric motor of the conventional electric tool grinding machine.
  • the invention provides an electric tool grinding machine 20 including a grip body 21, an electric motor 22, an eccentric block 23, a grinding disc 24, an airflow generating member 25 and a grinding disc cover 26.
  • the grip body 21 can be formed by connecting a plurality of shells 211.
  • a control circuit board 27 for controlling operation of the electric motor 22 is also disposed in the inner space of the grip body 21.
  • One of the plurality of shells 211 is provided with a motor housing 212 capable of covering the electric motor 22 therein.
  • an inner wall of the release port 263 sequentially includes a flow guiding section 264, an arcuate diversion section 265, and an air outlet section 266.
  • the flow guiding section 264 is connected with an inner wall surface of the cover body 261 close to the release port 263 without discontinuity and without difference in level.
  • the flow guiding section 264 forms a flat surface together with the inner wall surface of the cover body 261 close to the release port 263.
  • the arcuate diversion section 265 serves as a connection between the flow guiding section 264 and the air outlet section 266.
  • the air outlet section 266 and the flow guiding section 264 have different slopes.
  • an included angle between the air outlet section 266 and the flow guiding section 264 is greater than 90 degrees. Furthermore, the air outlet section 266 can be parallel to a surface 241 (as shown in FIG. 6 ) of the grinding disc 24 facing the grinding disc cover 26.
  • the invention is still capable of generating the heat dissipation airflow 40 that meets heat dissipation requirements of the electric motor 22 through cooperation of the grinding disc cover 26 and the airflow generating member 25 when the electric tool grinding machine 20 is not installed with an active dust suction structure.
  • the invention also improves the problem that heat accumulated in the electric motor 22 cannot be easily discharged and increases the comfort of the user's palm during long holding and use. Please refer to Table 1 and Table 2.
  • Table 1 is a comparison table of temperature rise between the invention and the conventional technique.
  • the invention refers to the electric tool grinding machine 20 of the invention
  • “convention without suction” refers to a conventional electric tool grinding machine not equipped with an active dust suction structure and equipped with a grinding disc cover with vent holes
  • “convention with suction” refers to a conventional electric tool grinding machine equipped with an active dust suction structure.
  • a temperature measurement point of Table 1 (indicated as 50 in FIG. 4 ) is the palm position when the user is grasping the electric tool grinding machine, and the electric tool grinding machine is provided with 80 grit abrasive paper and 15.24cm (6 inches) overall diameter grinding disc and is at a load of 180watts (W).
  • Table 2 Basic conditions of Table 2 are the same as those of Table 1, the only difference is that the temperature measurement point of Table 2 is the user's finger grip position (indicated as 51 in FIG. 4 ).
  • Table 1 Ambient temperature Machine running time 10 minutes 15 minutes 20 minutes 25 minutes 30 minutes
  • Table 2 Ambient temperature Machine running time 10 minutes 15 minutes 20 minutes 25 minutes 30 minutes The invention 22.3 24.8 25.2 24.9 24.4 24.3 Convention without suction 22.8 45.1 51.8 54.7 62.3 61.1 Convention with suction 21.8 27.9 28.9 28.1 29.2 28.9
  • a horizontal level of the release port 263 is equal to or lower than a horizontal level of the baseplate 251 of the airflow generating member 25 in the grinding disc cover 26 in order to effectively guide the heat dissipation airflow 40.
  • a diameter of the release port 263 is greater than a diameter of the assembly port 262.
  • the grinding disc cover 26 is trumpet-shaped. A flow velocity of the heat dissipation airflow 40 entering the grinding disc cover 26 from the air hole 214 is slowed down in order to prevent a flow velocity of the heat dissipation airflow 40 from being too fast to generate turbulence in the grinding disc cover 26.
  • a distance (as indicated by 32 in the figure) between the release port 263 and each of the plurality of fan blades 252 is greater than a radial length of each of the plurality of fan blades 252.
  • the cover body 261 includes an inclined surface 267 between the assembly port 262 and the release port 263, the inclined surface 267 is connected with the flow guiding section 264 of the release port 263, and a slope of the flow guiding section 264 is same as a slope of the inclined surface 267. Further, there is no level difference between the flow guiding section 264 and the inclined surface 267. Furthermore, a horizontal level of a top end 268 of the inclined surface 267 is same as or higher than a horizontal level of each of the plurality of fan blades 252. The top end 268 of the inclined surface 267 faces a top end of each of the plurality of fan blades 252, and the release port 263 faces a bottom end of each of the plurality of fan blades 252. The heat dissipation airflow 40 exhausted from an air outlet end 253 of each of the plurality of fan blades 252 is effectively guided.
  • the cover body 261 includes an engaging ring 269 formed around the assembly port 262, and a continuous concave-convex structure 260 is formed on an inner side of the engaging ring 269.
  • the grip body 21 includes a connecting concave-convex structure 215 assembled with the continuous concave-convex structure 260 at a position where the assembly port 262 is assembled.

Landscapes

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

Claims (9)

  1. Ein elektrisches Schleifmaschinenwerkzeug (20), umfassend:
    einen Griffkörper (21), der mit mindestens einem Lufteinlassloch (213) ausgebildet ist;
    einen Elektromotor (22), der in dem Griffkörper (21) angeordnet ist;
    einen Exzenterblock (23), der mit dem Elektromotor (22) verbunden ist und sich mit dem Elektromotor (22) dreht;
    eine Schleifscheibe (24), die mit dem Exzenterblock (23) verbunden ist;
    ein luftstromerzeugendes Element (25), das an dem exzentrischen Block (23) angebracht ist, wobei das luftstromerzeugende Element (25) bei der Drehung des Elektromotors (22) einen Wärmeableitungsluftstrom (40) in dem Griffkörper (21) bildet; und
    eine Schleifscheibenabdeckung (26), die mit dem Griffkörper (21) zusammengebaut ist und das luftstromerzeugende Element (25) darin abdeckt, wobei die Schleifscheibenabdeckung (26) einen Abdeckungskörper (261), eine Montageöffnung (262), die an einem Ende des Abdeckungskörpers (261) ausgebildet und mit dem Griffkörper (21) zusammengebaut ist, und eine Freigabeöffnung (263), die an einem anderen Ende des Abdeckungskörper s (261) ausgebildet ist und der Schleifscheibe (24) zugewandt ist, wobei der Abdeckungskörper (261) abgesehen von der Montageöffnung (262) und der Freigabeöffnung (263) keine Entlüftungsöffnung aufweist;
    dadurch gekennzeichnet, dass
    die Freigabeöffnung (263) das einzige Abluftteil der Schleifscheibenabdeckung (26) ist, wenn die Freigabeöffnung (263) von einer Richtung der Montageöffnung (262) in Richtung der Freigabeöffnung (263) betrachtet wird, eine Innenwand der Freigabeöffnung (263) nacheinander einen Strömungsführungsabschnitt (264), einen bogenförmigen Umleitungsabschnitt (265) und einen Luftauslassabschnitt (266) mit einer Neigung, die sich von einer Neigung des Strömungsführungsabschnitts (264) unterscheidet, und der bogenförmige Umlenkabschnitt (265) lenkt eine Luftstromrichtung (41) des Wärmeableitungsluftstroms (40), der zwischen der Schleifscheibenabdeckung (26) und der Schleifscheibe (24) austritt, so um, dass er parallel zur Schleifscheibe (24) verläuft.
  2. Das elektrische Schleifmaschinenwerkzeug (20) nach Anspruch 1, wobei das luftstromerzeugende Element (25) eine Grundplatte (251) und eine Mehrzahl von Lüfterflügeln (252) umfasst, die separat auf der Grundplatte (251) vorgesehen sind, ein Abstand (30), der zwischen einer Oberkante jedes der mehreren Lüfterflügeln (252) und dem Griffkörper (21) definiert ist, größer als 50% einer Längslänge jeder der mehreren Lüfterflügeln (252) ist, und ein Abstand (31), der zwischen einer Außenkante jeder der mehreren Lüfterflügel (252) und der Schleifscheibenabdeckung (26) definiert ist, größer als 50% einer radialen Länge jeder der mehreren Lüfterflügel (252) ist.
  3. Das elektrische Schleifmaschinenwerkzeug (20) nach Anspruch 2, wobei eine horizontale Ebene der Freigabeöffnung (263) gleich oder niedriger als eine horizontale Ebene der Grundplatte (251) innerhalb der Schleifscheibenabdeckung (26) ist.
  4. Das elektrische Schleifmaschinenwerkzeug (20) nach Anspruch 2 oder Anspruch 3, wobei ein Abstand (32), der zwischen der Freigabeöffnung (263) und jedem der mehreren Lüfterflügel (252) definiert ist, größer ist als eine radiale Länge jedes der mehreren Lüfterflügel (252).
  5. Das elektrische Schleifmaschinenwerkzeug (20) nach Anspruch 4, wobei der Abdeckungskörper (261) eine geneigte Fläche (267) zwischen der Montageöffnung (262) und der Freigabeöffnung (263) aufweist, die geneigte Fläche (267) mit dem Strömungsführungsabschnitt (264) der Freigabeöffnung (263) verbunden ist und eine Neigung des Strömungsführungsabschnitts (264) gleich einer Neigung der geneigten Fläche (267) ist.
  6. Das elektrische Schleifmaschinenwerkzeug (20) nach Anspruch 5, wobei ein horizontales Niveau eines oberen Endes (268) der geneigten Fläche (267) gleich oder höher ist als ein horizontales Niveau jeder der Vielzahl von Lüfterflügeln (252).
  7. Eine Schleifscheibenabdeckung (26) eines elektrischen Schleifmaschinenwerkzeugs, die Folgendes umfasst:
    einen Abdeckungskörper (261);
    eine Montageöffnung (262), die an einem Ende des Abdeckungskörper s (261) ausgebildet ist; und
    eine Freigabeöffnung (263), die an einem anderen Ende des Abdeckungskörper s (261) ausgebildet und koaxial mit der Montageöffnung (262) angeordnet ist,
    wobei der Abdeckungskörper (261) außer der Montageöffnung (262) und der Freigabeöffnung (263) kein Entlüftungsloch aufweist
    dadurch gekennzeichnet, dass
    ein Durchmesser der Freigabeöffnung (263) größer ist als ein Durchmesser der Montageöffnung (262), wenn die Freigabeöffnung (263) von einer Richtung der Montageöffnung (262) in Richtung der Freigabeöffnung (263) betrachtet wird, eine Innenwand der Freigabeöffnung (263) nacheinander einen Strömungsführungsabschnitt (264), einen bogenförmigen Umleitungsabschnitt (265) und einen Luftauslassabschnitt (266) mit einer Neigung aufweist, die sich von einer Neigung des Strömungsführungsabschnitts (264) unterscheidet.
  8. Die Schleifscheibenabdeckung (26) des elektrischen Schleifmaschinenwerkzeugs nach Anspruch 7, wobei der Abdeckungskörper (261) eine geneigte Fläche (267) zwischen der Montageöffnung (262) und der Freigabeöffnung (263) aufweist, die geneigte Fläche (267) mit dem Strömungsführungsabschnitt (264) der Freigabeöffnung (263) verbunden ist und eine Neigung des Strömungsführungsabschnitts (264) gleich einer Neigung der geneigten Fläche (267) ist.
  9. Die Schleifscheibenabdeckung (26) des elektrischen Schleifmaschinenwerkzeugs nach Anspruch 7, wobei der Abdeckungskörper (261) einen Eingriffsring (269) umfasst, der um die Montageöffnung (262) herum ausgebildet ist, und eine kontinuierliche konkav-konvexe Struktur (260) an einer Innenseite des Eingriffsrings (269) ausgebildet ist.
EP22206557.5A 2022-11-10 2022-11-10 Schleifmaschine für elektrowerkzeug und schleifscheibenabdeckung Active EP4368339B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22206557.5A EP4368339B1 (de) 2022-11-10 2022-11-10 Schleifmaschine für elektrowerkzeug und schleifscheibenabdeckung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22206557.5A EP4368339B1 (de) 2022-11-10 2022-11-10 Schleifmaschine für elektrowerkzeug und schleifscheibenabdeckung

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EP4368339A1 EP4368339A1 (de) 2024-05-15
EP4368339B1 true EP4368339B1 (de) 2025-09-24

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CN120941246B (zh) * 2025-10-17 2025-12-09 南通宝佳精密机械有限公司 一种具有降尘功能的传感器配件精密加工用数控机床

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US6257970B1 (en) * 1997-01-23 2001-07-10 Hao Chien Chao Ergonomically friendly random orbital construction
US7118467B2 (en) * 2003-10-22 2006-10-10 Sun Yung-Yung Pneumatic buffing machine
FI129765B (sv) 2007-03-21 2022-08-15 Oy Kwh Mirka Ab Kompakt elektrisk slipmaskin
US8758095B2 (en) * 2011-05-12 2014-06-24 Hutchins Manufacturing Company Abrading or polishing tool with improved motor chamber
DE102014007402A1 (de) 2014-05-20 2015-11-26 Festool Gmbh Hand-Werkzeugmaschine mit einem Partikelabfuhr-Anschluss

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