JP2006239838A - Inner surface washing method and device for cylindrical part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a washing method and a device capable of favorably washing the inner surface of a cylindrical part while strictly keeping the machining dimensions of the cylindrical part as an object work in blast processing. <P>SOLUTION: In this washing method, the inner surface of the cylindrical part 10 is washed by abrasive blasting in which the inner surface of the cylindrical part 10 is subjected to blasting of plastic projection material. The plastic projection material emitted from a blasting nozzle 1 is sprayed toward the top 4 of an umbrella-like reflecting part 2 provided opposite to the nozzle 1 without rotating the blasting nozzle 1 for the plastic projection material and the cylindrical part 10, whereby the inner surface of the cylindrical part is subject to blasting by the plastic projection material reflected by the umbrella-like reflecting part 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method and apparatus for cleaning an inner surface of a cylindrical part, and more particularly to a method and apparatus for cleaning an inner surface of a cylindrical part particularly suitable for cleaning the inner surface of a photosensitive drum used in a printer apparatus by blasting.

  Conventionally, cleaning of the inner surface of a photosensitive drum used in a printer apparatus is generally performed manually with a solvent, or has only to be cut by machining or a polishing brush or the like.

  However, due to the problem of VOC in recent years (regulation of the total amount of volatile organic compounds), it has become difficult to adopt a surface cleaning method that imposes a burden on workers and the environment. In the future, the social responsibility and attitude of companies will be questioned, and it is assumed that dangerous organic solvents will be completely unusable in the near future. Therefore, it has become an urgent task for companies that have social responsibility to establish a method for cleaning the surface of a photosensitive drum that does not give more environmental load.

  Under such circumstances, when the surface treatment is performed by machining without using a solvent, there is a problem in that the size of the initial cylindrical part may change and the predetermined function may not be performed. . Further, the treatment with a polishing brush has a problem that not only the brush is worn out and a certain treatment cannot be performed, but when the brush is worn, its ability is lowered and a desired treatment cannot be performed.

By the way, today, blasting is known as a means for performing surface treatment of various parts. For example, Patent Document 1 discloses an apparatus for blasting a steel pipe.
JP-A-11-90831 (Claims etc.)

  However, in order to strictly maintain the processing dimensions of the target workpiece in the blasting process, it is not possible to use abrasive grains or metal particles that cut the material, and photosensitivity requiring particularly strict dimensional characteristics. The same was true for the drums.

  Further, when the inner surface of the photosensitive drum is cleaned by blasting, it is important to prevent blast dust from adhering to the surface of the photosensitive drum. For this purpose, it is necessary to fix the photosensitive drum. In that case, in order to process the inner surface of the photosensitive drum, a mechanism such as jetting blast material from the side surface of the nozzle and rotating the nozzle is necessary, and a special device such as a link mechanism is provided between the blast hose and the nozzle. Necessary. However, in this case, there is a possibility that the projection mechanism may be clogged in the link mechanism portion and the nozzle cannot be rotated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a cleaning method and apparatus capable of satisfactorily cleaning the inner surface of a cylindrical part while strictly maintaining the machining dimension of the cylindrical part as a target workpiece in blasting. .

  Another object of the present invention is to provide an apparatus for preventing blast dust adhesion that prevents blast dust from adhering to the outer surface of the cylindrical part during blasting of the cylindrical part.

In order to solve the above problems, the method for cleaning the inner surface of a cylindrical part according to the present invention is a method for cleaning the inner surface of the cylindrical part by blasting by spraying a plastic projection material on the inner surface of the cylindrical part,
Without rotating the spray nozzle of the plastic projection material and the cylindrical part, the plastic projection material fired from the nozzle is sprayed toward the top of the umbrella-shaped reflection portion provided facing the nozzle, The inner surface of the cylindrical part is blasted with the plastic projection material reflected by the umbrella-like reflecting portion.

Further, the cylindrical part inner surface cleaning apparatus of the present invention is an apparatus for cleaning the inner surface of the cylindrical part by blasting by spraying a plastic projection material on the inner surface of the cylindrical part,
A spray nozzle for spraying the plastic projection material, and an umbrella-shaped reflecting portion provided with a top portion facing the nozzle, the nozzle and the umbrella-shaped reflecting portion being front and rear along the central axis of the cylindrical part It is characterized by being freely movable.

Furthermore, the blast dust adhesion prevention device of the present invention is a blast dust adhesion prevention device that prevents blast dust from adhering to the outer surface of the cylindrical part during blasting of the cylindrical part,
A cylindrical cover member that coaxially accommodates the cylindrical part with an appropriate gap from the outer surface of the cylindrical part, and a pair of rings that sandwich the cylindrical cover member and the cylindrical part from both ends via packing And the ring-shaped lid has a through hole coaxially with the inner diameter of the cylindrical part.

  According to the cleaning method and apparatus of the present invention, it is possible to clean the inner surface of the cylindrical part well while strictly maintaining the machining dimension of the cylindrical part that is the target workpiece in the blasting process. Moreover, according to the blast dust adhesion preventing apparatus of the present invention, it is possible to satisfactorily prevent blast dust from adhering to the outer surface of the cylindrical part during the blasting process of the cylindrical part.

Hereinafter, preferred embodiments of the present invention will be specifically described.
FIG. 1 shows an inner surface cleaning apparatus for spraying a plastic projection material on the inner surface of a cylindrical part 10. This apparatus includes a spray nozzle 1 for plastic projecting material and an umbrella-like reflecting portion 2 provided with a top portion facing the nozzle 1, and the nozzle 1 and the umbrella-like reflecting portion 2 are the center of a cylindrical part 10. The nozzle 1 and the umbrella-shaped reflecting portion 2 are preferably movable in conjunction with each other. The cylindrical part 10 may be erected and blasted, and in that case, the cylindrical part 10 is movable up and down.

  The umbrella-like reflecting portion 2 is formed to be movable by a shaft 3 provided on the bottom portion 5 and connected to an operating device (not shown). In addition, the nozzle 1 is not particularly limited, and it is possible to appropriately select and use those normally used for blasting.

  As a blasting device (not shown) that can be used in the device of the present invention, it is preferable to use an air blasting device, whereby the inner surface of the cylindrical part 10 can be cleaned uniformly. Among them, a direct injection type air blasting device is suitable, but other suction types can also be used, and are not particularly limited, and can be appropriately selected and used according to the application and use environment. .

  In the method for cleaning the inner surface of the cylindrical part 10 of the present invention, the plastic projection material fired from the nozzle 1 without rotating the spray nozzle 1 and the cylindrical part 10 of the plastic projection material in the apparatus shown in FIG. Is sprayed toward the top 4 of the umbrella-like reflecting portion 2 provided facing the nozzle 1. As a result, the inner surface of the cylindrical part 10 is blasted by the plastic projection material reflected by the umbrella-like reflecting portion 2. That is, the direction of the plastic projection material that hits the top 4 of the umbrella-like reflecting portion 2 changes continuously, spreads to 360 °, and the inner surface of the cylindrical part 10 is blasted. The surface from the top part 4 to the bottom part 5 of the umbrella-like reflection part 2 may be a curved surface so that the plastic projection material is sprayed onto the inner surface of the cylindrical part 10 from a more vertical direction.

  In order to blast the entire inner surface area of the cylindrical part 10, the umbrella-like reflecting part 2 may be moved back and forth along the central axis of the cylindrical part 10, that is, by moving the umbrella-like reflecting part 2 back and forth. The part to which the blast material is projected changes, and the entire inner surface can be blasted. Further, the nozzle 1 and the umbrella-like reflecting portion 2 are moved back and forth along the central axis of the cylindrical part 10 and the entire area of the inner surface of the cylindrical part 10 is blasted while keeping the distance between them constant. Therefore, it is possible to always perform uniform blasting. Alternatively, when the nozzle 1 is a straight blast type high-speed nozzle type, a method may be employed in which the nozzle is fixed and only the umbrella-like reflecting portion 2 is moved back and forth, and further, a peeling surface (blasting surface). In the case where the distance is very small, the umbrella-shaped reflecting portion 2 can be fixed.

  In addition, various substances can be processed by adjusting the moving speed of the umbrella-shaped reflector 2 according to the state of the substance attached to the inner surface of the cylindrical part 10, for example, the kind and thickness of the attached substance. It becomes possible.

  Furthermore, although not shown in the figure, by using a plurality of nozzles 1 and simultaneously spraying on the umbrella-shaped projections 2, automatic inner surface treatment can be performed in a short time.

  FIG. 2A is a blast dust adhesion preventing device that prevents blast dust from adhering to the outer surface of the cylindrical part 10 during the blasting process of the cylindrical part 10. This apparatus includes a cylindrical cover member 11 that coaxially accommodates the cylindrical part with an appropriate gap from the outer surface of the cylindrical part 10, and a ring-shaped packing 12 that connects the cylindrical cover member 11 and the cylindrical part 10 from both ends. And a pair of ring-shaped lid bodies 13 that are preferably sandwiched via urethane packing, and this ring-shaped lid body 13 has a through-hole 14 coaxially with the inner diameter of the cylindrical part 10. . For example, as shown in FIG. 2B, the ring-shaped lid 13 is fixed to both ends of the cylindrical cover member 11 with bolts 15 at three locations on one ring-shaped lid 13. At this time, the cylindrical part 10 is fixed in the cylindrical cover member 11 by fitting the cylindrical part 10 into a thin stepped portion 16 provided on the inner edge of the packing 12. When the photosensitive drum is processed as the cylindrical part 10, the photosensitive drum 10 is inserted into the stepped portion 16 in order to prevent the photosensitive layer 18 from touching the ring-shaped packing 12 as shown in FIG. 3. It is made to fix within the range of about 5 mm from the edge part. In order to smoothly insert the end portion of the photosensitive drum 10, it is preferable to provide a guide 17 around the stepped portion 16.

  By accommodating the cylindrical part 10 in the cylindrical cover member 11 in this way, blast dust adheres to the outer surface of the cylindrical part 10 without causing any hindrance to the blasting process of the cylindrical part 10. Can be prevented.

  In this invention, the projection material which has a thermosetting resin as a main component can be used suitably as a plastic projection material. The thermosetting resin is not particularly limited, and examples thereof include melamine resin (melamine-formaldehyde resin), urea resin (urea-formaldehyde resin), polycarbonate resin, phenol resin, epoxy resin, and unsaturated resin. A polyester resin, an acrylic resin, a guanamine resin, a polyurethane resin, and the like can be given, and other resins having a hardness comparable to these resins can also be used. Such a projectile can be collected after spraying and repeatedly circulated about 30 to 40 times.

  Specifically, as such a projection material, for example, a pulverized product of a thermosetting resin molded product having a particle size of 50 to 2000 μm, preferably 100 to 500 μm, and each particle has a substantially sharp ridgeline. A pulverized product that is an irregular polyhedron and that has a substantially uniform particle size at each classification stage can be suitably used. Such a pulverized product can be obtained by the method described in International Publication No. 00/45994.

Hereinafter, the present invention will be described specifically by way of examples.
A blast dust adhesion preventing apparatus shown in FIG. 2 was attached to the photosensitive drum as the cylindrical part 10 and blasting was performed as shown in FIG. As the conditions for the blasting treatment, a direct pressure type blasting apparatus was used as the apparatus, and a resin projecting material manufactured by Bridgestone Corporation as the projecting material. It was performed at 5 MPa. As the nozzle, a nozzle with a tip diameter of 6 mm was used. When the distance between the nozzle and the umbrella-shaped reflecting portion was kept constant at 50 mm and interlocked, the entire inner surface of the photosensitive drum could be cleaned in about 10 seconds. Further, when the photosensitive drum was checked after processing, no scratches were observed and no dimensional change was observed.

  The cleaning method and apparatus of the present invention are extremely effective for cleaning the inner surface of a photosensitive drum that requires strict dimensional stability.

It is explanatory drawing which shows the washing | cleaning method of one suitable example of this invention. (A) is sectional drawing of the blast dust adhesion prevention apparatus of one suitable example of this invention. (B) is a plan view of a ring-shaped lid used in the blast dust adhesion preventing device. It is an expanded sectional view which expands and shows the edge part of the blast dust adhesion prevention apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nozzle 2 Umbrella-shaped reflection part 3 Shaft 4 Top part 5 Bottom part 10 Cylindrical component 11 Cylindrical cover member 12 Ring-shaped packing 13 Ring-shaped cover body 14 Through-hole 15 Bolt 16 Step part 17 Guide 18 Photosensitive layer

Claims (7)

A method of cleaning the inner surface of the cylindrical part by blasting by spraying a plastic projection material on the inner surface of the cylindrical part,
Without rotating the spray nozzle of the plastic projection material and the cylindrical part, the plastic projection material fired from the nozzle is sprayed toward the top of the umbrella-shaped reflection portion provided facing the nozzle, A method of cleaning an inner surface of a cylindrical part, comprising: blasting the inner surface of the cylindrical part with the plastic projection material reflected by the umbrella-like reflecting portion.   The method according to claim 1, wherein the entire area of the inner surface of the cylindrical part is blasted by moving the umbrella-like reflection part back and forth along the central axis of the cylindrical part.   2. The nozzle and the umbrella-like reflecting portion are moved back and forth along the central axis of the cylindrical part, and the entire area of the inner surface of the cylindrical part is blasted while keeping the distance between them constant. The method described.   The method according to any one of claims 1 to 3, wherein a projection material having a particle size of 50 to 2000 µm mainly composed of a thermosetting resin is used as the plastic projection material.   The method according to claim 1, wherein the cylindrical part is a photosensitive drum. An apparatus for cleaning the inner surface of a cylindrical part by blasting by spraying a plastic projection material on the inner surface of the cylindrical part,
A spray nozzle for spraying the plastic projection material, and an umbrella-shaped reflecting portion provided with a top portion facing the nozzle, the nozzle and the umbrella-shaped reflecting portion being front and rear along the central axis of the cylindrical part A device for cleaning an inner surface of a cylindrical part characterized by being freely movable. A blast dust adhesion preventing device that prevents blast dust from adhering to the outer surface of a cylindrical part when blasting a cylindrical part,
A cylindrical cover member that coaxially accommodates the cylindrical part with an appropriate gap from the outer surface of the cylindrical part, and a pair of rings that sandwich the cylindrical cover member and the cylindrical part from both ends via packing A blast dust adhesion preventing device, characterized in that the ring-shaped lid body has a through hole having the same diameter as the inside diameter of the cylindrical part coaxially.

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