JP2013180376A - Protection mechanism for observation window - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an observation window protection mechanism capable of maintaining transparency for a long period of time, while being less likely to cause collision of a projection agent, etc.SOLUTION: A projection agent ejected from a nozzle collides with the surface of a workpiece and a portion thereof is reflected to scatter toward an observation window 8, when removing the coating, etc., on the surface of the workpiece 3 by using nozzles 4 or 5. Then, the projection agent is captured by an air curtain ejected from a lower edge part of the observation window 8 and directed upward, when approaching the observation window 8, so as to go up through without colliding against the observation window 8.

Description

  The present invention relates to a viewing window protection mechanism provided in a sandblasting apparatus or the like.

  Patent Document 1 discloses a sandblasting device for removing an insulating film on the surface of an electric wire. This sandblasting device is provided with a cylindrical rotating member rotatably between fixed members, and a plurality of viewing windows are formed at predetermined locations in the circumferential direction of the rotating member, and the insulation film of the electric wire is removed in the cylindrical member. The situation can be observed from the outside.

  Moreover, what is disclosed by patent document 2 is known as an air blower which forcibly retains the air in space. This blower is provided with air circulation means in a line shape at the upper end of the partition panel so as to blow out air upward in a curtain shape.

JP-A-4-16343 JP 2000-157392 A

  FIG. 3 is a diagram for explaining the problems of the viewing window of the conventional sandblasting device. The particles (projection agent) ejected from the nozzle are reflected after hitting the work, hit the viewing window, and the transparency of the viewing window gradually increases. It will be lost. For this reason, it must be replaced once every three days, which is cumbersome and wasteful in terms of cost.

  Therefore, it is conceivable to prevent the particles from hitting the viewing window using the blower of Patent Document 2, but depending on the direction of the blower, the flow of air inside may be disturbed and the transparency of the viewing window may be lost early. become.

  Moreover, when protecting a viewing window from a propellant etc., the location which a propellant is easy to hit exists, and this position changes delicately with each apparatus. Therefore, it is difficult to maintain the transparency of the observation window over a long period even if the blower is simply arranged.

  In order to solve the above-mentioned problems, the protection mechanism for the viewing window according to the present invention is such that the viewing window is formed in a part of a box that forms a sealed space, and the lower edge in the vicinity of the lower edge of the viewing window in this space. A line-shaped air blower is arranged along the section, and the air blower is composed of a plurality of air blow units along the lower edge, and each air blow unit is individually adjustable in air volume and jet angle. did.

  The viewing window is not limited to the viewing window of a sandblasting apparatus, but may be a heating furnace, a coating chamber, a machine tool, or the like.

According to the observation mechanism for the observation window according to the present invention, it is possible to effectively prevent particles such as a propellant from colliding with the observation window. Is greatly improved.

Sectional view of sandblasting machine according to the present invention The perspective view of the principal part of the sandblasting machine which concerns on this invention Diagram explaining problems of conventional sandblasting machine

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the embodiment, an example in which the present invention is applied to a sandblasting apparatus is shown, but the present invention is not limited to this.
In the sandblasting apparatus, a work space is defined by a box 1, a table 2 is provided at the center of the work space, and a work 3 is set on the table 2.

  In addition, nozzles 4 and 5 for ejecting the propellant are suspended from the ceiling of the box 1. A hopper 6 is provided at the bottom of the box 1. In this embodiment, two nozzles face the work space in order to use them according to the type of work.

  Further, an insertion portion 7 for inserting an operator's hand is provided on the front surface of the box 1, and a viewing window 8 is provided on an inclined surface above the insertion portion 7, and a lower edge portion of the viewing window 8. A line-shaped air blower 9 is disposed along the line. In addition, guide plates 10 and 11 may be disposed in the inner part of the box 1, that is, on the part opposite to the insertion portion 7.

  The blower 9 is composed of a plurality of blower units 12 along the lower edge of the viewing window 8, and each blower unit 12 includes a hollow head 13 and a pipe 14, and a plurality of ejection holes are formed on the upper surface of the hollow head 13. 15 are formed in a line. Each pipe 14 is provided with an on / off valve or a flow rate adjusting valve (not shown), and the hollow head 13 and the pipe 14 can be individually replaced.

  In the above, when the coating film or the like on the surface of the work 3 is removed using the nozzle 4 or 5, the projecting agent ejected from the nozzle collides with the work surface, and a part of it is reflected and scattered toward the viewing window 8. To do. When the propellant approaches the viewing window 8, it is ejected from the lower edge of the viewing window 8 and is supplemented by the upwardly facing air curtain, and then comes upward without colliding with the viewing window 8.

  The upward air flow hits the wall of the box, the direction changes, and the air flow becomes downward as a whole, finally flows into the hopper 6, and the propellant scattered from the workpiece 3 enters the hopper 6. It is captured and becomes a new material. When the guide plates 10 and 11 are provided, the guide plates 10 and 11 are efficiently flowed.

  Although the location along the upper edge part and side edge part of the observation window 8 can be considered as the place where the blower device 9 is disposed, if it is provided on the upper edge part, it is against the flow of the air current in the box 1 and on the side edge part. As a result of the verification, it was found that, if provided, a turbulent flow is generated, and the portion along the lower edge of the observation window 8 is optimal in terms of location.

  The present invention can be applied to an apparatus having a viewing window such as a sandblasting apparatus, a heating furnace, and a painting booth.

  DESCRIPTION OF SYMBOLS 1 ... Box, 2 ... Table, 3 ... Work, 4, 5 ... Nozzle, 6 ... Hopper, 7 ... Insertion part, 8 ... Viewing window, 9 ... Blower, 10, 11 ... Guide plate, 12 ... Blower unit, 13 ... head, 14 ... piping, 15 ... jet hole.

Claims (2)

A viewing window for observing the inside of the space is formed in a part of the box forming the sealed space, and a line-shaped air blower along the lower edge in the vicinity of the lower edge of the viewing window in the space. , And the blower device is composed of a plurality of blower units along the lower edge, and each blower unit can individually adjust the air volume and the jetting angle. 2. The protection mechanism according to claim 1, wherein the viewing window is a viewing window of a sandblasting apparatus.

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