WO2011099643A1 - 局所クリーンゾーン形成装置 - Google Patents
局所クリーンゾーン形成装置 Download PDFInfo
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- WO2011099643A1 WO2011099643A1 PCT/JP2011/053315 JP2011053315W WO2011099643A1 WO 2011099643 A1 WO2011099643 A1 WO 2011099643A1 JP 2011053315 W JP2011053315 W JP 2011053315W WO 2011099643 A1 WO2011099643 A1 WO 2011099643A1
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- WIPO (PCT)
- Prior art keywords
- air blowing
- air
- push
- clean zone
- push hood
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F9/00—Use of air currents for screening, e.g. air curtains
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L1/00—Enclosures; Chambers
- B01L1/02—Air-pressure chambers; Air-locks therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L1/00—Enclosures; Chambers
- B01L1/04—Dust-free rooms or enclosures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
- F24F3/163—Clean air work stations, i.e. selected areas within a space which filtered air is passed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
Definitions
- the present invention relates to a local clean zone forming apparatus for forming a clean air space in a work area.
- a method of locally cleaning only a part of the work space that needs to be cleaned is generally used, and a clean bench method is a typical clean zone formation technique.
- this clean bench system there is an opening for work only on the front surface of the work table, and the other surfaces are surrounded by the ceiling and the surroundings to maintain cleanliness.
- a clean air outlet is arranged in the enclosure, and the worker has a structure in which he / she works by putting his / her hand through the front working opening.
- a clean bench having such a basic structure and various functions has also been proposed. Examples of known publications proposing these clean benches are JP2001-141273A, JP2005-48970A, and JP2006-162174A.
- the inventors of the present invention have previously made a pair of push hoods so that two air flows can collide with each other as a local air cleaning device that is excellent in workability and can provide an excellent clean zone without limiting the object of work.
- a local air cleaning device arranged in a face-to-face relationship was proposed (JP 2008-27526A).
- This device opens all the boundary surfaces parallel to the air flow direction formed between the air blowing surfaces of a pair of directly opposed push hoods, and forms a clean air space without using walls or enclosures.
- the object of the present invention is to improve the applicability and practicality, taking advantage of the advantages of the previously proposed local air cleaning device, and further improve the workability without limiting the object of the work.
- An object of the present invention is to provide a new local clean zone forming apparatus that can save an installation space and provide an excellent clean zone at low cost.
- a first aspect of the present invention provides a pair of push hoods having a rectifying mechanism for forming a uniform air flow in the air blowing surface, the air blowing surfaces being parallel to each other and the air blowing surface.
- the uniform air flows blown out of the push hood in a positional relationship where the centers of the push hoods do not face each other face each other and collide with each other, and the uniform air flow is inclined with respect to the air blowing surface.
- This is a local clean zone forming apparatus configured to blow out at an angle.
- the rectifying mechanism includes at least one honeycomb-shaped parallel porous body and at least one air resistance body, and the porous portion of the honeycomb-shaped parallel porous body is inclined with respect to the air blowing surface.
- the local clean zone forming device according to the first aspect, wherein the local clean zone forming device is arranged at an angle.
- the porous portions of the honeycomb parallel porous bodies of the rectifying mechanism are arranged at an angle in a horizontal oblique direction with respect to the air blowing surface. is there.
- the angle formed by the side surface that borders the surface having the air blowing surface of the housing forming the external shape of the push hood is an obtuse angle.
- the air blowing surface from the air blowing surface in the push hood forming the obtuse angle side surface
- the local clean zone forming device causes a pair of push hoods that are blown at an angle in an oblique direction to the air blowing surfaces to collide with each other by causing the uniform air flows blown from the air blowing surfaces to face each other. Because a clean zone can be formed between the air blowing surfaces of push hoods, it is possible to form a clean zone with a high degree of cleanness without an enclosure like a clean bench, and there should be no enclosure that obstructs work. Therefore, the workability of the worker in the clean zone is excellent, and the object of the work is not limited.
- the local clean zone forming device of the present invention since the local clean zone forming device of the present invention has no enclosure and can be blown at an angle with respect to the air blowing surface, even in a production line involving the conveyance of production parts, etc.
- a clean zone can be formed by sandwiching the work area only diagonally with a pair of push hoods and causing uniform air flows to collide with each other, enclosing the entire production line or cleaning the entire work room.
- a clean zone can be easily and locally formed without the need for equipment.
- the installation space of the device can be saved, the device itself and construction costs are low, and only the necessary local space is cleaned, so it is possible to reduce maintenance costs such as unnecessary replacement filters and electricity costs. .
- the operator's body enters the airflow that forms the clean zone, and the airflow is not disturbed and the formation of the clean zone is not hindered. Only the tip of the arm enters the airflow in the clean zone. Therefore, it is possible to maintain a clean zone.
- the local clean zone forming apparatus of the present invention is blown out from a pair of push hoods while avoiding obstacles even when there are obstacles such as pillars and manufacturing equipment that are difficult to move in the installation area of the apparatus. It is possible to form a clean zone in accordance with the structure of the obstacle and the working room by causing the uniform air flows to be opposed to each other by blowing them obliquely. In addition, it is possible to form a clean zone even in a narrow work room that could not be installed so far, and it is possible to efficiently use the work area while substantially reducing the installation space. .
- the conventional push hood only has a function of blowing an air flow in a direction perpendicular to the air blowing surface.
- the push hood has a function of blowing at an angle with respect to the air blowing surface of the push hood. . Since it is difficult for the user of the apparatus of the present invention or the apparatus installer to determine at what angle the air is blown out of the two side surfaces that are in contact with the housing surface having the air blowing surface. By forming at least one side surface parallel to the angle of the uniform air flow that blows at an angle to the air blowing surface, the device blows the air flow at any angle just by looking at the appearance of the push hood. It is possible to determine whether there is any.
- the local clean zone forming apparatus of the present invention can freely arrange the air blowing surfaces of a pair of push hoods at any height or range such as from the floor surface to the ceiling, and can be cleaned according to work and application.
- the range of the zone can be given freely.
- the local clean zone forming apparatus of the present invention can form the apparatus body of the push hood relatively small, so that the apparatus can be easily moved by providing a moving means such as a caster if necessary.
- a moving means such as a caster
- FIG. 1 is a perspective view showing an installation example of a local clean zone forming apparatus using a pair of push hoods according to the present invention.
- FIG. 2A is a diagram showing a uniform airflow space formed from one push hood.
- FIG. 2B is a diagram showing a uniform airflow space formed when a pair of push hoods are installed so that the airflow faces each other.
- FIG. 3A is a top transparent view showing a typical example of a rectifying mechanism used in the present invention.
- FIG. 3B is a top transparent view showing a typical example of the rectifying mechanism used in the present invention.
- FIG. 3C is a top transparent view showing a typical example of the rectifying mechanism used in the present invention.
- FIG. 3A is a top transparent view showing a typical example of a rectifying mechanism used in the present invention.
- FIG. 3B is a top transparent view showing a typical example of the rectifying mechanism used in the present invention.
- FIG. 3C is a top transparent view showing
- FIG. 3D is a top transparent view showing a typical example of the rectifying mechanism used in the present invention.
- FIG. 4-a is a four-side view showing a typical example of a push hood used in the present invention.
- FIG. 4-b is a four-side view showing a typical example of a push hood used in the present invention.
- FIG. 4-c is a four-side view showing a typical example of a push hood used in the present invention.
- FIG. 4-d is a four-side view showing a typical example of a push hood used in the present invention.
- FIG. 5A is a top view showing a representative example of the housing shape of the push hood used in the present invention.
- FIG. 5B is a top view showing a representative example of the housing shape of the push hood used in the present invention.
- FIG. 5C is a top view showing a representative example of the housing shape of the push hood used in the present invention.
- FIG. 5D is a top view showing a typical example of the housing shape of the push hood used in the present invention.
- FIG. 6A is a top transparent view showing a part of airflow in the push hood used in the present invention.
- FIG. 6B is a top transparent view showing a part of airflow in the push hood used in the present invention.
- FIG. 7A is a top view showing an installation example of the device of Patent Document 4 which is a local clean zone forming device using a pair of conventional push hoods.
- FIG. 7B is a top view showing an installation example of a local clean zone forming apparatus using a pair of push hoods of the present invention.
- FIG. 8A is a top view showing an installation example of a local clean zone forming apparatus using a pair of push hoods of the present invention.
- FIG. 8B is a top view showing an installation example of the device of Patent Document 4 which is a local clean zone forming device using a pair of conventional push hoods.
- FIG. 9A is an explanatory diagram of measurement positions and measurement results of Experimental Example 1.
- FIG. 9B is an explanatory diagram of measurement positions and measurement results in Experimental Example 2.
- the local clean zone forming apparatus of the present invention is characterized in that uniform air flows blown obliquely with respect to the air blowing surface from a pair of push hoods are opposed to each other.
- a push hood that blows out airflow it is possible to adopt the structure of a push hood conventionally used in push-pull type ventilators, and in addition to this, a push hood used in the present invention is added to the structure that blows obliquely. be able to.
- a typical use example of a local clean zone forming apparatus comprising a pair of push hoods in the present invention is shown in FIG.
- This uniform air flow is also called uniform trapped air flow or laminar flow, and when viewed in a cross section perpendicular to the air flow blown from the air blowing surface, the magnitude of the flow velocity is substantially constant throughout the cross section.
- the fluctuation of velocity distribution in the state of no obstacle is within ⁇ 50% of the average value ⁇ Dust prevention rules, based on the provisions of Article 11, Paragraph 2, Item 4 of Dust Rules Requirements specified by the Minister of Health, Labor and Welfare (according to Notification No. 30 of the Ministry of Labor in 1998), especially those within ⁇ 20% are preferable.
- a low wind speed of about 0.3 to 1.5 m / second is preferred as the initial speed blown on the air blowing surface, and when the air flow is blown from the air blowing surface, It flows so as to slowly carry the air in the entire cross section of the airflow in the direction blown from the air blowing surface.
- the housing that forms the appearance of the push hood and the rectifying mechanism installed therein have a shape that has many straight portions that can be linearly cut, bent, or joined for manufacturing efficiency.
- This shape is desirable, and is also desirable from the viewpoint of area efficiency of the air blowing surface.
- the air blowing surface for forming this uniform air flow is a square or a rectangle, and the ratio of the long side and the short side is from 5: 1 to a square.
- a quadrangular shape is preferred. However, it is not necessary to consider these manufacturing or structural losses, and when emphasizing design, it is possible to appropriately select a circle or other free shape.
- FIG. 2A is a diagram showing a uniform airflow space formed from one push hood as viewed from the short side direction.
- the range in which the aspect can be maintained depends on the distance of the short side L of the rectangle including the square of the air blowing surface 2, and the distance is up to about three times the short side L of the air blowing surface 2.
- the airflow space has an isosceles triangular area 3 that connects the center of the air blowing surface 2 with the short side L of the air blowing surface 2 as the base and the distance of three times as long as viewed from the short side direction.
- the space When viewed from the direction, the space becomes a trapezoidal shape (not shown) having a bottom side (long side), a top side (long side -L), and a height (3L).
- FIG. 2-b is a diagram showing a uniform airflow space formed when a pair of push hoods are installed so that the airflow faces each other, and shows the airflow used in the present invention.
- the uniform airflow is The range that can be formed is that each of the air blowouts of the push hoods 1 that face each other in the form of an isosceles triangle that connects the center of the air blowout surface 2 with the short side L of the air blowout surface 2 as a base and takes a distance three times as long as the base.
- the two uniform airflows 3 do not overlap in reality. Near the middle of the push hood 1, the two uniform air flows 3 collide, and then the air flow changes in a direction perpendicular to the flow direction so far, and the uniform air flow formed between the pair of push hoods 1. It is pushed out of the space 3. This is because the uniform air flow 3 is continuously blown from the push hood 1. As shown in FIG. 2A, the uniform air flow space 3 is tapered according to the distance blown out from the air blowing surface 2 with only the air flow blown out from one push hood 1, but a pair of pairs as shown in FIG.
- the wind speed of the air blowing portion of the air curtain airflow is about 5 to 10 m / s at the initial speed, and has a very high wind speed compared with the wind speed of the uniform airflow.
- the push hood is a housing that covers the entire device, and it is appropriate to take into account members such as a rectifying mechanism installed inside by bending or pressing a steel plate with a thickness of 0.3 to 5.0 mm, or design. What was made into the shape of this can be used. Further, it is possible to adopt a housing configuration in which a framework of the entire apparatus is formed by combining an L-shaped frame made of metal or the like, and then the apparatus surface is covered with a steel plate or a synthetic resin plate.
- the housing of the push hood is not limited to these structures and materials, and an appropriate structure can be used in consideration of the weight of an internal rectifying mechanism and the like.
- a stainless steel plate having a thickness of 1.0 to 1.6 mm is linearly bent, cut, welded, etc. to form a housing from the balance between workability and strength.
- a stainless steel plate having a thickness of 1.0 to 1.6 mm is linearly bent, cut, welded, etc. to form a housing from the balance between workability and strength.
- Particularly preferred are:
- one surface of the housing has an air blowing surface, and a crosspiece for protecting the ventilation surface of the rectifying mechanism adjacent to the inside of the device is provided on the air blowing surface.
- a crosspiece for protecting the ventilation surface of the rectifying mechanism adjacent to the inside of the device is provided on the air blowing surface.
- steel or resin can be selected as appropriate.
- a crosspiece can be formed on the entire air blowing surface in such a manner that square members of ⁇ 1.0 to 100.0 mm can be combined vertically, horizontally and diagonally.
- the crosspieces are configured with a sparse spacing so as not to affect the airflow such as the wind speed and direction of the airflow ventilated from the rectifying mechanism. It is also possible to use a wire net or a resin net for the crosspiece.
- the fixing method of the crosspiece such as welding around the air blowing surface from the inside of the housing or fixing the frame by providing a frame or the like on the housing.
- a rectifying mechanism 6 configured to blow a uniform air flow from the air blowing surface 2 is provided with a gap from the crosspiece 12 of the air blowing surface 2 so that a ventilation surface of the air blowing surface 2 is provided. They are arranged so as to overlap.
- the rectifying mechanism 6 is configured by superposing a plurality of members having an area equivalent to or slightly larger than the area of the air blowing surface 2. At least one or more honeycomb-shaped parallel porous bodies 10 are disposed on the downstream side of the rectifying mechanism 6, that is, the position closest to the air blowing surface 2, and at least one air resistor 11 is disposed on the upstream side thereof.
- the rectifying mechanism 6 corrects the air flow in the air resistor 11 that is biased in the air flow rate with respect to the entire air blowing surface 2 blown from the upstream side of the rectifying mechanism 6, so that there is no bias in the entire air blowing surface 2. Make the air flow uniform.
- the direction of the air flow uniformized by the air resistor 11 is given, and the direction of the uniform air flow is stabilized and blown out from the air blowing surface 2, thereby forming a uniform air flow space. It can be formed stably.
- the honeycomb-shaped parallel porous body 10 means a porous body having a large number of porous bodies in parallel and having a diameter of the longitudinal section, that is, a depth larger than the diameter of the transverse section of the unit porous body.
- the parallel porous bodies are not limited to a honeycomb structure in a narrow sense, and include those having a cross-sectional shape of a polygon or a circle having a triangular shape or more, and the unit porous body has a cross-sectional diameter of 1 to 10 mm.
- the ratio of the depth to the same diameter is preferably 1: 1.2 to 1: 5.
- the material of these honeycomb-shaped parallel porous bodies 10 is typically a metal such as stainless steel, aluminum or titanium, or a synthetic resin such as vinyl chloride resin, but the material is not particularly limited in the present invention.
- the air flow that is biased in the air flow amount with respect to the entire air blowing surface 2 that is blown from the upstream side of the rectifying mechanism 6 is made uniform in the entire air blowing surface 2.
- Any material can be used as long as it becomes a resistor of the blast air for correcting the airflow, regardless of the material such as a punching plate, a net member, a nonwoven fabric, or a filter such as a prefilter or a medium performance filter.
- the hole shape of the punching plate includes a triangular shape or more of a polygonal shape and a circular shape, but there are various shapes such as the hole shape and As for the arrangement or interval thereof, it is preferable that the variation of the aperture ratio per unit area of the punching plate itself is as small as possible.
- air resistance is selected from various mesh members such as metal meshes such as plain weave, twill weave, plain tatami mat, twill mat weave, sintered wire mesh or synthetic resin mesh. Any mesh that acts as a body can be used as appropriate.
- a nonwoven fabric is used as the air resistor, a material that acts as an air resistor can be used as appropriate based on the ventilation resistance when a filter is used as the air resistor.
- FIG. 3A, FIG. 3B, FIG. 3C, and FIG. 3D are top cross-sectional views illustrating the rectifying mechanism 6 in the push hood of the present invention when the rectifying mechanism 6 blows off to the oblique angle ⁇ 17a. It is.
- FIG. 3A shows a honeycomb parallel porous body 10a having an angle 17a of ⁇ ° close to the air blowing surface 2, and an air resistor 11a made of a punching plate at an upstream side of the honeycomb parallel porous body 10a. Is arranged.
- the air flow is made uniform by the air resistor 11a of the rectifying mechanism 6 so that the air flow is uneven in the air flow rate with respect to the entire air blowing surface 2, and the passed air flow is rectified by changing the flow to the angle ⁇ 17a in the honeycomb parallel porous body 10a.
- This is the basic structure of the rectifying mechanism 6 used in the present invention. With this basic structure, the variation in velocity distribution can be made within ⁇ 50% of the average value.
- This angle ⁇ 17a can be appropriately selected according to the method of using the apparatus and the like within a range larger than 10 ° and smaller than 90 ° with respect to the air blowing surface 2. Usually, it is preferable to select in the range of 30 ° to 85 ° with respect to the air blowing surface 2 because it brings a substantial effect.
- FIG. 3B shows a honeycomb parallel porous body 10a having a porous portion angle 17a of ⁇ ° near the air blowing surface 2, and air resistors 11a and 11b made of two punching plates having the same aperture ratio on the upstream side.
- the parallel parallel porous body 10a and the air resistors 11a and 11b are arranged with a space therebetween, and the honeycomb parallel porous body 11b having a vertical porous body angle is disposed upstream thereof.
- the rectifying mechanism 6 also rectifies the air flow in the final honeycomb-shaped parallel porous body 10a by changing the flow to an angle ⁇ 17a.
- an air resistor 11b and a honeycomb parallel porous body 10b having a vertical angle of the porous body are added, so that the honeycomb parallel porous first added to the inlet of the rectifying mechanism 6 is first added.
- the direction of the airflow is adjusted by the body 10b, and then the bias of the air flow rate is corrected by the first air resistor 11b.
- the same as the rectifying mechanism 6 of FIG. As a result, the airflow directionality and uniformity are in a certain level before the airflow passes through the rectifying mechanism of FIG.
- FIG. 3-c changes the honeycomb-type parallel porous body 10b of FIG. 3-b to a honeycomb-type parallel porous body 10c having the same angle ⁇ of the porous portion of the honeycomb-type parallel porous body 10a, and the entire rectifying mechanism 6 is in parallel with the honeycomb type.
- a parallelogram shape is formed so as to be parallel to the angle ⁇ of the porous portion of the porous body 10a. It comes to blow out.
- the angle of the porous body of the honeycomb-shaped parallel porous body at the entrance of the rectifying mechanism 6 is arranged at the same angle ⁇ 17a as that of the honeycomb-shaped parallel porous body 10a on the air blowing surface 2 side, but is arranged vertically. However, either can be selected, and in FIG. 3C, the variation in the velocity distribution can be within ⁇ 30% of the average value as in FIG. Since the angles of the porous portions of the honeycomb parallel porous bodies 10a and 10c are the same, the members can be shared.
- FIG. 3D is a diagram in which one air resistor 11c made of a punching plate having the same aperture ratio as that of the air resistors 11a and 11b is added to FIG.
- the rectifying mechanism 6 illustrated in FIG. 3D is a particularly preferable mode as an effect of improving the uniformity of the uniform air flow and further expanding the uniform air flow forming space. Further, as the configuration of the rectifying mechanism 6 that blows out a uniform air flow, the number and order of the air resistor 11 and the honeycomb parallel porous body 10 used, the interval thereof, or the like can be appropriately changed. Moreover, it is preferable that the air speeds of the uniform air flow to be countered are the same in order to balance the clean zone.
- a cylindrical portion having a shape slightly larger than the outer shape of the rectifying mechanism 6 is provided in the housing 13 of the push hood 1, and the honeycomb-shaped parallel porous body 10 and the air resistor 11 which are components of the rectifying mechanism 6 are provided inside the cylindrical portion.
- the method for fixing the rectifying mechanism to the push hood of the present invention is not limited to this structure, and an appropriate structure may be used.
- a high-performance filter 7 according to the cleaning level such as a HEPA filter or ULPA filter in the push hood 1. It is preferable to arrange the vent surfaces so that the ventilation surfaces overlap each other in terms of the layout of the push hood 1 with little loss of space. Further, in the local clean zone forming apparatus of the present invention, an air flow is generated using a blower such as a blower or a fan. Therefore, a pre-filter or a medium performance filter 9 is provided on the upstream side of the blower 8, and a push is performed. It is preferable that air is filtered to some extent in the most upstream side of the hood 1 to protect the blower device 8 arranged on the downstream side, and clogging of the high performance filter 7 arranged on the further downstream side is suppressed.
- a blower such as a blower or a fan. Therefore, a pre-filter or a medium performance filter 9 is provided on the upstream side of the blower 8, and a push is performed. It is preferable that air is filtered to some extent
- FIG. 4-a, FIG. 4-b, FIG. 4-c, and FIG. 4-d illustrate the embodiment of the present invention.
- 4A has an air blowing surface 2 at the upper part of the push hood 1, a rectifying mechanism 6, a high performance filter 7 at the upper side, and a centrifugal fan 8 a at the lower side, and the air blowing surface of the push hood 1.
- An air suction port 5 is provided in the lower part on the back side opposite to 2.
- the air suction surface 5 can be suitably used as a net-like material such as a welding net used also for the air blowing surface 2, a punching plate used for the air resistor 11 of the rectifying mechanism 6 or various net members, It is preferable to have air permeability that does not affect the suction force of the centrifugal fan 8a.
- the air outside the push hood device is sucked from the air suction port 5 by the centrifugal fan 8a built in the push hood 1, and the air is sucked from the outside by the prefilter 9 provided on the upstream side of the centrifugal fan 8a. The relatively rough dust contained in the is removed.
- the air filtered by the pre-filter 9 passes through the centrifugal fan 8a and flows to the back side, which is the opposite side of the air blowing surface 2 on the upper side of the apparatus, in the push lud 1.
- finer dust and the like are filtered by the high-performance filter 7 such as a HEPA filter, rectified by the rectifying mechanism 6, and a uniform air flow is formed at an angle of 45 ° with respect to the air blowing surface 2. It is blown out from a cross 12 made of a welding net.
- the thickness of the push hood 1 main body can be reduced by not arranging the rectifying mechanism 6 and the high performance filter 7 and the centrifugal fan 8a which is a blower in series.
- the mesh member of the air suction port 5 on the rear surface of the push hood 1 is fixed with a decorative screw or the like so that the pre-filter 9 can be removed from the push hood 1 and replaced when the pre-filter 9 is clogged.
- the high-performance filter 7 is provided with a filter replacement window 16 on the rear side of the push hood 1 of the high-performance filter 7 so that the high-performance filter 7 can be removed and replaced from the push hood 1 when the high-performance filter 7 is clogged. .
- 4-b has an air blowing surface 2 at the top of the push hood 1, and a rectifying mechanism 6, a high performance filter 7, an axial fan 8 b, a pre-filter 9, and an air suction port 5 are arranged in series on the upper side,
- a rectifying mechanism 6, a high performance filter 7, an axial fan 8 b, a pre-filter 9, and an air suction port 5 are arranged in series on the upper side
- pillars 20 for setting the push hood to a certain height from the ground are provided at the four corners of the push hood 1, and casters 19 are attached to the ends of the pillars 20.
- the thickness of the device body of the push hood 1 is thicker than that of FIG. 4-a, but the entire push hood 1 can be kept compact.
- FIG. 4-c illustrates the case where the air blowing surface 2 of the apparatus illustrated in FIG. 4-a is on the lower side, and the configuration of the apparatus illustrated in FIG. 4-a is reversed.
- a centrifugal fan 8a is used, and a high-performance filter 7, a centrifugal fan 8a, a prefilter 9, and air suction ports 5 are arranged in series in two rows above and below a vertically long straightening mechanism 6, respectively.
- this apparatus can form a clean zone over a wide range without using a large blower mechanism 8.
- the air blowing mechanism 8 may be controlled by one large fan in a place where it is not particularly necessary to consider noise. It is also possible to expand the clean zone in the horizontal direction by changing the configuration of the apparatus in FIG. 4-d in the horizontal direction, and it is possible to configure the apparatus according to the application as appropriate.
- the blower mechanism 8 provided separately from the main body of the push hood 1 is ventilated from the blower 8 such as a blower to the upstream side of the high-performance filter 7 of the push hood 1 through the duct. It is connected to the back surface of the push hood 1. Even if the blower mechanism 8 and the push hood 1 main body are separate, it is possible to use a plurality of blower mechanisms 8 and ducts and connect a plurality of ducts to a single push hood to make a wide area clean. Yes, it can be configured according to the application as appropriate.
- both the one provided with the air blowing mechanism 8 separately from the main body of the push hood 1 and the one equipped with the air blowing mechanism 8 incorporated in the main body of the push hood 1 are arranged in a wide range of clean zones by arranging a plurality of main bodies of the push hood 1 side by side in parallel. It is also possible to form In this case, it is preferable that the wind speed of the air flow ejected from the plurality of push hoods is within ⁇ 50% of the variation in the velocity distribution of the plurality of push hoods as a whole.
- the air blowing device 8 such as a blower installed through a duct has a function capable of varying the wind speed generated by phase control, inverter control or applied voltage control. It is desirable. Thereby, for example, when the installation location of the push hood 1 is moved and the distance between the push hoods is changed, the appropriate wind speed can be easily ensured. In addition, the balance of the clean zone can be easily restored by adjusting the wind speed, such as when the balance of the wind speed is lost due to clogging of the high performance filter 7 in the push hood 1 or the like.
- the apparatus can be easily moved, and variations in the operation of the apparatus such as a response to a change in work layout and movement between work rooms can be expanded.
- FIG. 5-a, FIG. 5-b, FIG. 5-c, and FIG. 5-d are views showing a state when the push hood 1 of the present invention is viewed from above.
- the external appearance of this device can be implemented as a cube or a rectangular parallelepiped as shown in FIG. 5A, but it is a device that blows an airflow obliquely with respect to the air blowing surface 2 of the push hood 1. For this reason, in a rectangular parallelepiped or a cube, it is impossible to determine at which angle the operator himself blows out when the push hood 1 is installed or after the installation. Therefore, as shown in FIG. 5B, FIG. 5C, and FIG.
- At least one of the two side surfaces that are in contact with the housing surface having the air blowing surface 2 is oblique to the air blowing surface 2.
- the angle of the push hood 1 can be determined just by looking at the appearance of the push hood 1 so that the device is a device that blows out the air flow. It is also possible to form an external shape.
- 5B is a parallelogram when the housing 13 of the push hood 1 is viewed from above
- FIG. 5-C and FIG. 5-D are trapezoidal shapes, and can be formed in an appropriate shape. It is possible to recognize the direction of airflow.
- FIGS. 6A and 6B are top views showing an example of the push hood 1 having the side surface of the housing 13 formed in parallel with the uniform air flow blown horizontally and obliquely with respect to the air blowing surface 2.
- the housing 13 is formed at an obtuse angle with respect to the air blowing surface 2, and 13a is formed at an acute angle on the contrary. There is some turbulence in the airflow.
- the air blowing surface 2 extends from the air blowing surface 2 on the side 13b where the housing 13 is formed at an obtuse angle to the housing 13 on the opposite back side and from the upper end to the lower end of the air blowing surface.
- FIG. 7A is a diagram illustrating an example of a top view when the blowout opening surface 2 of the push hood is vertically opposed.
- Fig. 7-b is a view showing an example of a top view when the local clean zone forming device of the present invention is disposed with the conveying means 21 for manufacturing parts such as a belt conveyor in between.
- the apparatus of the present invention has a pair of push hoods 1 configured to blow a uniform air flow obliquely with respect to the air blowing surface 2 at an angle 17a. From the vertical direction, the air blowing surfaces 2 are parallel to each other, and the uniform air flows blown from the push hood 1 are caused to collide with each other in a positional relationship where the centers of the air blowing surfaces 2 do not face each other.
- a three-dimensional clean zone 4 is formed between the air blowing surfaces 2 of the pair of push hoods 1 and the base is parallelogram-shaped and has no enclosure in the flow direction of the airflow. To do.
- the apparatus of the present invention it is possible to form the clean zone 4 at an angle 17a in an oblique direction, so that the body of the worker himself 26 does not have to enter the air current, and only the tip of the worker 26's arm is required. Since the work can be performed without entering the air current in the clean zone, the worker 26 can perform the work without causing a large disturbance in the air current in the formed clean zone 4.
- FIG. 8A is a top view showing a state where the local clean zone forming apparatus of the present invention is installed in a narrow place. Compared to the facing system shown in FIG. 8B, the work space 22 can be efficiently used while keeping the installation space substantially space-saving, and the work area 22 has not been able to be installed so far.
- the clean zone 4 can also be formed in the area 22.
- the push hood used in the present invention can appropriately select the function conditions such as the size of the air flow blowing surface and the blowing wind speed, the distance between the push hoods, and the like according to the work contents and other conditions.
- the function conditions such as the size of the air flow blowing surface and the blowing wind speed, the distance between the push hoods, and the like according to the work contents and other conditions.
- the air flow blowing surface is a regular or rectangular shape with a side of 300 to 3000 mm
- the blowing wind speed is 0.1 to 2.0 m / sec
- the distance between the push hoods is 1 to 9 m.
- Example 1 A welded net that is fixed by welding a plurality of stainless steel rods with a diameter of ⁇ 1.0 mm on the air blowing surface 2 in a net-like manner so as to form a 30 mm square lattice, and by welding the overlapping portions of the rods.
- Is used as a crosspiece 12 and the crosspiece 12 is arranged on a 900 mm ⁇ 700 mm rectangular air blowing surface 2 arranged on the upper stage of the push hood 1, and is substantially the same as the air blowing surface 2 on the upstream side of the air blowing surface 2.
- the rectifying mechanism 6 having an area of size, the HEPA filter 7 on the upstream side of the rectifying mechanism 6 is spaced from the rectifying mechanism 6, and packing is used so that the air flowing between the rectifying mechanism 6 and the HEPA filter 7 does not leak.
- a push hood 1 that blows out a uniform flow that is disposed in a lower stage of the push hood 1 on the upstream side of the push hood 1 and that has a centrifugal fan 8a is made.
- the rectifying mechanism 6 includes a first honeycomb-shaped parallel porous body 10a, three air punched air resistors 11a, 11b, 11c, and a second honeycomb-shaped parallel porous body from the air flow downstream side of the air blowing surface 2 side. 10c configuration.
- the three punching plates 11a, 11b, and 11c which are air resistors, are disposed at intervals of 10 mm and 20 mm from the downstream punching plate 11, respectively, and the three punching plates 11a, 11b, and 11c all have the same opening.
- a thing with a rate was used, the thing made from aluminum with a thickness of t1.0mm, a hole with a hole diameter of ⁇ 1.0mm, a pitch of 2.0mm, 60 ° staggered, and an opening rate of 23% was used.
- the used honeycomb-type parallel porous body 10 is made of aluminum having a plate thickness of 0.001 mm for both the first and second honeycomb-type parallel porous bodies 10a and 10c, and the porous portion is a regular hexagonal 1/8 inch large porous body.
- the configuration of this push hood is a push hood in which a rectifying mechanism shown in FIG.
- the wind speed of the air blowing surface 2 was measured at 54 measurement points 24 using the push hood 1 described above.
- the wind speed measurement position and result of the air blowing surface 2 are shown in FIG.
- the maximum variation in wind speed distribution with respect to the average wind speed when the air blowing surface wind speed was about 0.5 m / s was 15.0%. From the above results, it has been found that the variation in the velocity distribution is much smaller than 50% which is the condition of the uniform air flow required in the present invention. Even when only one punching plate was disposed as the honeycomb parallel porous body 10a on the air blowing surface side of the rectifying mechanism and the air resistor 11a on the upstream side, a result of 50% or less was obtained.
- Example 2 Next, an example of measuring the cleanliness of air when the local clean zone forming apparatus of Example 1 is used will be described. Unlike the cleanliness class used in the clean clean room used here, it is defined and used as follows.
- C o the number dust concentration in the vicinity of inlet suction fan (room air) (0.1 ⁇ m / 0.01cf), when the number dust concentration of pushing airflow to C p (0.1 ⁇ m / 0.01cf), cleanliness It is calculated by the following formula.
- Example 2 two push hoods identical to those in Example 1 were used and installed as shown in FIG. 1 so that the two air currents face each other. did.
- the vertical distance of the air blowing surface 2 of the push hood 1 was 1500 mm, and the distance between the two push hood pushes was set to 2100 mm.
- the measurement points 25 for cleanliness were measured at a total of nine locations, 250 mm in the vertical direction from the air blowing surface 2 of each push hood 1 and the center position between the push hoods.
- the experimental results showed high cleanliness at all measurement points, and it was found that most areas between push hoods were clean areas.
- the measurement position and measurement result of cleanliness in Example 2 are shown in FIG.
- the local clean zone forming apparatus of the present invention can be effectively used in fields that require a clean zone where a clean bench, a clean booth, or a clean room has been conventionally used.
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Abstract
Description
本発明の目的は、先に提案した局所空気清浄化装置の利点を生かした上で、応用可能性及び実用性を高め、さらに作業性に優れ、作業の対象を制限することなしに、装置の設置スペースを省スペースに抑え、安価で容易に優れたクリーンゾーンを与えることのできる新しい局所クリーンゾーン形成装置を提供することにある。
本発明は、第1に、一様空気流を形成するための整流機構を空気吹出面に内設してもつ一対のプッシュフードを、互いの該空気吹出面どうしを平行に且つ該空気吹出面の中心どうしが正対しない位置関係で該プッシュフードから吹き出される一様空気流どうしを対向させて衝突するように配置すると共に、該一様空気流を該空気吹出面に対して斜め方向に角度をもって吹き出すように構成してなる局所クリーンゾーン形成装置である。
本発明の局所クリーンゾーン形成装置は空気吹出面に対して斜め方向に角度をもって吹き出す一対のプッシュフードを互いに空気吹出面から吹き出される一様空気流どうしを対向させて衝突させることで、該一対のプッシュフードの空気吹出面間にクリーンゾーンを形成できるため、クリーンベンチのように囲いがなくとも高い清浄度をもつクリーンゾーンを形成することが可能であり、作業の邪魔になる囲いがないことからクリーンゾーンにおける作業者の作業性に優れ、それらの作業の対象を制限することがない。
図2−aは一台のプッシュフードから形成される一様空気流空間を示す図である。
図2−bは一対のプッシュフードを気流が対向するように設置したときに形成される一様空気流空間を示す図である。
図3−aは本発明で用いる整流機構の代表例を示す上面透過図である。
図3−bは本発明で用いる整流機構の代表例を示す上面透過図である。
図3−cは本発明で用いる整流機構の代表例を示す上面透過図である。
図3−dは本発明で用いる整流機構の代表例を示す上面透過図である。
図4−aは本発明で用いるプッシュフードの代表例を示す四面図である。
図4−bは本発明で用いるプッシュフードの代表例を示す四面図である。
図4−cは本発明で用いるプッシュフードの代表例を示す四面図である。
図4−dは本発明で用いるプッシュフードの代表例を示す四面図である。
図5−aは本発明で用いるプッシュフードのハウジング形状の代表例を示す上面図である。
図5−bは本発明で用いるプッシュフードのハウジング形状の代表例を示す上面図である。
図5−cは本発明で用いるプッシュフードのハウジング形状の代表例を示す上面図である。
図5−dは本発明で用いるプッシュフードのハウジング形状の代表例を示す上面図である。
図6−aは本発明で用いるプッシュフードにおける一部の気流の流れを示す上面透過図である。
図6−bは本発明で用いるプッシュフードにおける一部の気流の流れを示す上面透過図である。
図7−aは従来の一対のプッシュフードを用いた局所クリーンゾーン形成装置である特許文献4の装置の設置例を示す上面図である。
図7−bは本発明の一対のプッシュフードを用いた局所クリーンゾーン形成装置の設置例を示す上面図である。
図8−aは本発明の一対のプッシュフードを用いた局所クリーンゾーン形成装置の設置例を示す上面図である。
図8−bは従来の一対のプッシュフードを用いた局所クリーンゾーン形成装置である特許文献4の装置の設置例を示す上面図である。
図9−aは実験例1の測定位置及び測定結果の説明図である。
図9−bは実験例2の測定位置及び測定結果の説明図である。
図3−dは、図3−cにさらに空気抵抗体11a、11bと同じ開口率のパンチング板からなる空気抵抗体11cを1枚追加し空気抵抗体の合計枚数を3枚使用したものであるが、下流側の多孔板11aから上流側に向かって隙間10mm、20mmの間隔をもたせている。これにより空気吹出面2全体に対して通気量に偏りのある気流をさらに精度よく補正し均一化することが可能となる。図3−dに例示した整流機構6は一様空気流の一様性を向上させ、さらにその一様空気流形成空間を広げる効果をもたらすものとして特に好ましい形態である。また一様空気流を吹き出す整流機構6の構成として空気抵抗体11、ハニカム形並列多孔体10とも用いる枚数や順番或いはそれらの間隔等も適宜変更可能である。
また、対抗させる一様空気流の風速はクリーンゾーンのバランスをとるために同等とすることが好ましい。
空気吹出面2にφ1.0mmのステンレス棒材を30mmの四角格子が形成されるように縦横に均等に網状に複数重ね合わせてそれぞれの棒材が重なった箇所を溶接して固定された溶接網を桟12に用い、その桟12をプッシュフード1の上段に配した900mm×700mmの長方形状の空気吹出面2に配し、その空気吹出面2の上流側に空気吹出面2とほぼ同様のサイズの面積をもつ整流機構6を、そのさらに上流側にHEPAフィルタ7を整流機構6と間隔を空けて且つ整流機構6とHEPAフィルタ7の間に流れる空気に漏れのないようにパッキンを用いてハウジング内に設けた固定用フレームに固定して配置し、そのさらに上流側のプッシュフード1の下段に遠心ファン8aを内設する一様流を吹き出すプッシュフード1を作った。整流機構6は、空気吹出面2側である気流の下流側より第1のハニカム形並列多孔体10a、3枚のパンチングからなる空気抵抗体11a、11b、11c、第2のハニカム形並列多孔体10cの構成からなる。空気抵抗体である3枚のパンチング板11a、11b、11cはそれぞれ下流側のパンチング板11より10mm、20mmの間隔をもって配置されていて、3枚のパンチング板11a、11b、11cはいずれも同じ開口率をもつものを使用し、厚みt1.0mmのアルミニウム製で、孔径φ1.0mmの丸孔、ピッチ2.0mm、60°千鳥、開孔率23%のものを使用した。また用いたハニカム形並列多孔体10は第1、第2のハニカム形並列多孔体10a、10cともに板厚0.001mmのアルミニウム製で多孔部は正六角形の1/8inch大のものを、多孔体を水平斜め方向に角度α45°に傾斜させた状態でハニカム形並列多孔体11全体の厚さが8mmのものを使用した。このプッシュフードの構成は図4−aに示すプッシュフードに図3−d示す整流機構を内設したプッシュフードである。上記のプッシュフード1を用いて全54箇所の測定ポイント24において空気吹出面2の風速の測定を行った。空気吹出面2の風速測定位置及び結果を図9−aに示す。
空気吹出面風速が約0.5m/s時の平均風速に対する風速分布のバラツキは最大で15.0%であった。以上の結果から本発明で必要とされる一様空気流の条件である50%をはるかに下回る非常に速度分布のバラツキが小さいものであることがわかった。なお整流機構の空気吹出面側にハニカム形並列多孔体10a、その上流側に空気抵抗体11aとしてパンチング板を1枚配置しただけのものであっても50%以下となる結果が得られた。
次に実施例1の局所クリーンゾーン形成装置を用いた場合の空気の清浄度の測定例について述べる。
ここで用いる清浄なクリーンルームなどで使われている清浄度クラスとは異なり、次のように定義して用いる。
Coをファン吸い込み口付近(室内空気)の個数粉塵濃度(0.1μm/0.01cf)、Cpをプッシュ気流の個数粉塵濃度(0.1μm/0.01cf)とした場合、清浄度は次式で求められる。
実験結果よりすべての測定ポイントにおいて高い清浄度を示し、プッシュフード間のほとんどの領域が清浄域になることが判明した。
実施例2における清浄度の測定位置及び測定結果を図9−bに示す。
2 空気吹出面
3 一様空気流空間
3a 拡大された一様空気流空間
4 クリーンゾーン
5 空気吸込面
6 整流機構
6a 整流機構(空気吹出面側)
7 高性能フィルタ(HEPAフィルタ、ULPAフィルタ)
8 送風機構
8a 遠心ファン
8b 軸流ファン
9 中性能フィルタ(プレフィルタ)
10 ハニカム形並列多孔体
10a 第一のハニカム形並列多孔体(斜め)
10b 第二のハニカム形並列多孔体(垂直)
10c 第二のハニカム形並列多孔体(斜め)
11 空気抵抗体
11a 第一の空気抵抗体
11b 第二の空気抵抗体
11c 第三の空気抵抗体
12 桟
13 ハウジング
13a ハウジング(鋭角部)
13b ハウジング(鈍角部)
14 遮蔽板
16 フィルタ交換窓
17 空気吹出角度
17a 空気吹出角度(斜め)
17b 空気吹出角度(垂直)
18 送風制御部
19 キャスター
20 支柱
21 製造部品等搬送手段(ベルトコンベア)
21a 部品搬送方向
22 設置エリア
23 障害物(柱、設備)
24 風速測定ポイント
25 清浄度測定ポイント
26 作業者
27 吹き溜まり
28 非通気部
Claims (6)
- 一様空気流を形成するための整流機構を空気吹出面に内設してもつ一対のプッシュフードを、互いの該空気吹出面どうしを平行に且つ該空気吹出面の中心どうしが正対しない位置関係で該プッシュフードから吹き出される一様空気流どうしを対向させて衝突するように配置すると共に、該一様空気流を該空気吹出面に対して斜め方向に角度をもって吹き出すように構成してなる局所クリーンゾーン形成装置。
- 該整流機構が、少なくとも1つのハニカム形並列多孔体と少なくとも1つの空気抵抗体からなり、該ハニカム形並列多孔体の多孔部が該空気吹出面に対して斜め方向に角度をもって配列されている請求項1に記載の局所クリーンゾーン形成装置。
- 該整流機構のハニカム形並列多孔体の多孔部が該空気吹出面に対して水平斜め方向に角度をもって配列されている請求項2に記載の局所クリーンゾーン形成装置。
- 該プッシュフードを上面方向より見たとき、該プッシュフードの外観形状を形成するハウジングの該空気吹出面を有するハウジング面と境界を接する2つの側面のうち少なくともいずれか一方の側面が、該空気吹出面に対して水平斜め方向に吹き出す一様空気流の角度と平行であることを特徴とする請求項3に記載の局所クリーンゾーン形成装置。
- 該プッシュフードを上面方向より見たとき、該プッシュフードの外観形状を形成するハウジングの該空気吹出面を有する面と境界を接する側面の成す角度が鈍角であって且つその側面が該空気吹出面に対して水平斜め方向に吹き出す一様空気流の角度と平行であるプッシュフードにおいて、該鈍角の側面を形成するプッシュフード内の空気吹出面から該空気吹出面と対向するもう一方の側の背面側ハウジングに亘り且つ該空気吹出面の上端から下端に亘って縦方向に遮蔽板を内設したことを特徴とする請求項4に記載の局所クリーンゾーン形成装置。
- 該一対のプッシュフードの空気吹出面どうしの間に形成されるクリーンゾーンの気流方向と平行するクリーンゾーンの境界面すべてが開放状態となる請求項1~5のいずれか1項に記載の局所クリーンゾーン形成装置。
Priority Applications (7)
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JP2011553924A JP5389194B2 (ja) | 2010-02-15 | 2011-02-09 | 局所クリーンゾーン形成装置 |
CN201180008971.5A CN102762925B (zh) | 2010-02-15 | 2011-02-09 | 局部洁净区形成装置 |
CA2789747A CA2789747C (en) | 2010-02-15 | 2011-02-09 | Local clean zone forming apparatus |
US13/578,938 US9791161B2 (en) | 2010-02-15 | 2011-02-09 | Local clean zone forming apparatus |
EP11742381.4A EP2522921B1 (en) | 2010-02-15 | 2011-02-09 | Local clean zone forming apparatus |
AU2011215148A AU2011215148B2 (en) | 2010-02-15 | 2011-02-09 | Local clean zone forming apparatus |
KR1020127023985A KR101698503B1 (ko) | 2010-02-15 | 2011-02-09 | 국소 클린 존 형성장치 |
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JP (1) | JP5389194B2 (ja) |
KR (1) | KR101698503B1 (ja) |
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WO2019111451A1 (ja) * | 2017-12-06 | 2019-06-13 | 新東工業株式会社 | プッシュフード |
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AU2011215148B2 (en) | 2014-03-27 |
WO2011099643A8 (ja) | 2012-08-16 |
CA2789747A1 (en) | 2011-08-18 |
US20120322356A1 (en) | 2012-12-20 |
KR101698503B1 (ko) | 2017-01-20 |
CN102762925B (zh) | 2015-04-01 |
KR20120129966A (ko) | 2012-11-28 |
AU2011215148A1 (en) | 2012-08-30 |
JP5389194B2 (ja) | 2014-01-15 |
CN102762925A (zh) | 2012-10-31 |
CA2789747C (en) | 2017-06-13 |
US9791161B2 (en) | 2017-10-17 |
EP2522921A4 (en) | 2018-03-21 |
JPWO2011099643A1 (ja) | 2013-06-17 |
EP2522921A1 (en) | 2012-11-14 |
EP2522921B1 (en) | 2019-03-06 |
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