JP2005186230A - Method and device for peeling off coating of wheel for railroad - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for peeling off the coating of a wheel for a railroad which has no adverse effect to the health of a worker and the natural environment and which enables the peeling of the coating without damaging the surface of the wheel. <P>SOLUTION: The method is for peeling off the coating on the surface of the wheel for a railroad by blowing a projection material. A plastic projection material in the range of grain sizes of 100-2,000 μm, which is essentially composed of a thermosetting resin, is used as the projection material. The coating on the surface of the wheel is peeled off by blowing the projection material to the surface of the wheel 200 for a railroad in the device 100 for peeling off the coating. The device 100 is provided with a blast room 10 having an opening part 11 with the approximately same diameter as the outer diameter of the wheel 200 and at least one nozzle 1 installed inside the blast room 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a paint peeling method and a paint peeling device for railway wheels (hereinafter also simply referred to as “wheels”), and more specifically, a railway that uses a blasting process to peel the surface of a railway wheel, particularly a bearing portion. The present invention relates to a paint peeling method for a railway wheel and a paint peeling apparatus for a railway wheel.

  In general, a method using a solvent is often used for peeling the coating in various coated products. However, the paint stripping solvent is generally a volatile organic solvent, and not only is it harmful to the health of the worker, but its use has been reviewed from the viewpoint of protecting the natural environment.

  In recent years, EU countries have established VOC (Volatile Organic Compound) regulations that restrict the use of these volatile organic solvents themselves, and harmful organic solvents are being reduced. In Japan as well, its use is strictly controlled by the PRTR (Pollutant Release and Transfer Register) method, and the standards for its use are also the Air Pollution Control Law, Water Pollution Control Law, and Environmental Standards. It is strictly regulated by law.

  On the other hand, a method of peeling the coating by blasting using a metal projection material (blasting material) is also conceivable, but the metal material has high hardness and may damage the surface of the object. Such a painted portion where safety is very important is not suitable for use as a projection material. There is also a method of peeling and washing the coating film using high-pressure water, but this method is not a suitable method from the viewpoint of environmental protection because a large amount of waste water is generated.

Furthermore, a technique using a plastic projection material based on a resin material is also known conventionally, and is described in, for example, Patent Documents 1 and 2.
JP 2001-277129 A (Claims etc.) International Publication No. 00/45994 Pamphlet

  As described above, there are various methods for removing the paint on the surface of the painted product. However, there is no problem with respect to the health and natural environment of the operator and the wheel surface is not damaged. No method has been proposed so far for removing paint.

  Accordingly, an object of the present invention is to solve the above-described problems, and to remove the paint without damaging the wheel surface without adversely affecting the health and natural environment of the worker. And providing a paint peeling apparatus.

  In order to solve the above-mentioned problems, the method for peeling off a railway wheel according to the present invention is a method of peeling off the coating on the surface of a railway wheel by spraying the projection material. A plastic projection material having a particle diameter of 100 to 2000 μm is used.

  The railway wheel paint peeling apparatus of the present invention is an opening having a diameter substantially the same as the outer diameter of the wheel in the paint peeling apparatus for spraying a projection material on the surface of a railway wheel and peeling the paint on the wheel surface. And a blast room having a section and at least one nozzle installed in the blast room.

  According to the paint stripping method of the present invention, unlike the prior art, there is no risk of exposure to harmful substances such as organic solvents during work, so that the worker can strip the coating safely and in a short time. It becomes possible. In addition, a large amount of contaminated water is not generated, and the natural environment is not adversely affected. Furthermore, since resin material is used as the main component of the blasting material, it is possible to peel off the surface coating without damaging the metal material of the railroad wheel, leaving toxic substances on the wheel surface by blasting. There is no fear. In addition, according to the paint peeling apparatus of the present invention, even if dust is generated by blasting, a closed system with the blasting room as a closed system allows the projection material to be used in a predetermined dust collecting container without scattering dust outside. Can be recovered.

Hereinafter, preferred embodiments of the present invention will be described in detail.
In the method for peeling off a railway wheel according to the present invention, when the surface of a railway wheel is peeled off by spraying a projection material, the projection material has a particle size in the range of 100 to 2000 μm mainly composed of a thermosetting resin. Use plastic projection material. As a result, without causing problems as in conventional methods using organic solvents and metal blasting materials, it is also possible to properly remove paint on the wheel surface, particularly on parts where safety is important, such as bearings. Can be done.

  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.

  Specifically, the projection material is, for example, a pulverized product of a thermosetting resin molded product having a particle size in the range of 50 to 1000 μm, and each particle is an amorphous polyhedron having a substantially sharp ridgeline. In addition, a pulverized product having a substantially uniform particle size for each classification step can be suitably used. Such a pulverized product can be obtained by the method described in Patent Document 2.

  As the blasting device used in the paint peeling method of the present invention, a direct injection type air blasting device is suitable, but a centrifugal type or the like can also be used and is not particularly limited. In particular, it is preferable to perform the spraying treatment of the projection material by using the railway wheel paint peeling apparatus of the present invention described below.

  1 to 3 show an example of a paint peeling apparatus for railway wheels according to the present invention. 1 is a partially cutaway side view, FIG. 2 is a partially cutaway front view, and FIG. 3 is a partially cutaway perspective view. The illustrated paint peeling apparatus 100 sprays a projection material on the surface of a railway wheel 200 to peel off the paint, and has a blast room 10 having an opening 11 having substantially the same diameter as the outer diameter of the wheel 200; , And at least one nozzle 1 installed therein.

  By performing a blasting process using an apparatus including a blasting room 10 having a shape surrounding the outer periphery of the wheel 200 as shown in the figure, dust scattering during blasting can be prevented and combined with the plastic projection material described above. Thus, it is possible to further reduce the load on the environment. The blast room 10 is preferably formed in a substantially cylindrical shape having the same diameter as the outer diameter of the wheel 200, as shown in FIGS. There is no problem even if the shape is.

  The blast room 10 is provided with a cushioning material 12 that can be engaged with the wheel 200 at the inner peripheral edge of the opening 11, and the wheel 200 is attached to the blasting room 10 with the wheel 200 and the cushioning material 12 engaged. It is preferable to provide a fixing means for fixing (not shown). As such a fixing means, for example, a method of passing a flat plate inside the wheel 200 and fixing the end portion by a three-point method can be used, whereby the wheel 200 and the blast room 10 are interposed via the cushion material 12. And make it close. Thereby, the position of the wheel 200 can be reliably held during the blasting process, the process can be performed smoothly, and leakage of the projection material from the blasting room 10 can be prevented.

  Further, the outer diameter of the railway wheel 200 usually fluctuates with use and is initially about φ850, but is used until it finally reaches about φ790. Accordingly, in order to prevent the projection material from leaking from the gap by always matching the center of the blast room 10 and the axis center of the wheel 200 at any stage during this period, the blast room 10 has a height adjusting mechanism. It is preferable to provide it. For example, as shown in FIGS. 2 (a) and 2 (b), by providing a caster 14 with an adjuster 13 on the side surface of the blast room 10, along with the height adjusting mechanism of the blast room 10, The device 100 itself can be provided with moving means.

  It is necessary to provide at least one nozzle 1 in the blast room 10, but it is preferable to provide two or more nozzles 1 as shown in FIGS. The type of the nozzle 1 is not particularly limited, and those normally used for blasting can be appropriately selected and used. In the present invention, a nozzle having a predetermined shape described below is particularly used. It is preferable to use it. Specifically, from the end of the inner throat portion toward the outlet tip, the inner diameter is increased at a spread angle θ of 0.5 to 3.0 ° with respect to the longitudinal direction of the nozzle to form a taper shape, and the throat portion end The nozzle has a shape in which the ratio (B / A) of the length B from the outlet to the outlet tip and the diameter A of the throat portion is 10 or more, and can be suitably applied to plastic abrasives.

  In the paint peeling apparatus 100 of the present invention, as shown in the figure, the nozzle 1 is fixed to a support plate 2 that is rotatable about the axis of the wheel 200 and is pivoted as the motor 3 rotates. Then, the blasting process can be performed for a predetermined range of the surface of the wheel 200 by appropriately moving the nozzle 1 vertically or horizontally in parallel.

  Next, the surface on which the nozzle 1 is rotated around the axle of the wheel 200 and the blasting process is not performed by rotating the manual handle 15 provided on the opposite side of the opening 11 outside the blast room 10 by 90 °. Process. By this operation, it is possible to perform paint peeling on the wheel 200, particularly on all surfaces on the bearing circumference. In order to change the blast position, for example, a fixed plate that supports the support plate 2 to which the nozzle 1 is fixed is formed so as to be slidable, and the position of the nozzle 1 may be appropriately moved by sliding the fixed plate. As a result, the blast range can be expanded without removing the blast room 10 from the wheel 200. Alternatively, the spraying direction may be adjusted by fixing the nozzle 1 to the support plate 2 so that the spraying angle can be changed and changing the nozzle angle.

  After the blasting process is completed, it is preferable to prevent the projection material from remaining by the air blow 4 provided in advance so that the projection material does not leak from the joint between the wheel 200 and the blast room 10. Further, in the present invention, in order to prevent erroneous injection when the blast room 10 is not attached, a proximity switch is provided inside the blast room 10 so that injection can be performed by detection of this switch. It is also preferable.

  During actual processing, the nozzle 1 automatically swings at the start of the blasting process to spray the projection material, stops after a certain period of time, and then automatically blows air to complete a series of processing. To do. In addition, the code | symbol 17 in a figure shows a projection material supply port, and the projection material sent from here is each supplied to the nozzle 1 provided in two places in the example shown through the branch pipe 19 (refer FIG. 3). ). The sprayed material after spraying is recovered from the projecting material recovery port 16 and repeatedly circulated for use. Reference numeral 18 denotes a switch box. By incorporating an emergency stop function and a frequency adjustment function, the blasting process can be performed more smoothly and safely.

  The railway wheel paint peeling method and paint peeling apparatus of the present invention can be used, for example, for bearing paint peeling processing in deep inspection of railway wheels, and also for blasting of wheel side surfaces in addition to bearing parts. Applicable.

It is a partially cutaway side view of the paint peeling apparatus for railway wheels of the present invention. It is a partially cutaway front view of the paint peeling device for railway wheels of the present invention. It is a partially cutaway perspective view of the paint peeling device for a railway wheel of the present invention. It is sectional drawing which shows an internal structure when the nozzle suitably applicable to this invention is cut | disconnected along a longitudinal direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nozzle 2 Support plate 3 Motor 4 Air blow 10 Blast room 11 Opening part 12 Cushion material 13 Adjuster 14 Caster 15 Manual handle 16 Projection material collection port 17 Projection material supply port 18 Switch box 19 Branch pipe 100 Paint peeling apparatus 200 Railway wheel

Claims (10)

  In the method of peeling off the coating on the surface of a railway wheel by spraying a projection material, the projection material is a plastic projection material having a particle size of 100 to 2000 μm mainly composed of a thermosetting resin. Method for removing paint on the wheel surface.   The paint peeling method according to claim 1, wherein the projection material is sprayed and then collected and repeatedly circulated for use.   The paint peeling method according to claim 1 or 2, wherein an air blasting device is used.   As the projection material, a pulverized product of a thermosetting resin molded product having a particle size in the range of 50 to 1000 μm, each particle is an amorphous polyhedron having a substantially sharp ridgeline, and for each classification step The paint peeling method according to any one of claims 1 to 3, wherein a pulverized product having a substantially uniform particle size is used.   In a paint stripping device that sprays a projection material on the surface of a railway wheel and strips the coating on the surface of the wheel, a blast room having an opening having the same diameter as the outer diameter of the wheel, and installed inside the blast room And at least one nozzle.   The paint peeling apparatus according to claim 5, wherein the nozzle is fixed to a support plate rotatable about the same axis as the wheel shaft so that the spray angle can be changed.   A cushioning material that can be engaged with the wheel is provided at an inner peripheral edge of the opening, and a fixing means that fixes the wheel to the blast room in a state where the wheel and the cushioning material are engaged. Item 7. The paint peeling apparatus according to Item 5 or 6.   The paint peeling apparatus as described in any one of Claims 5-7 provided with the height adjustment mechanism of the said blast room.   The paint peeling apparatus as described in any one of Claims 5-8 provided with a moving means.   The nozzle is tapered from the end of the inner throat portion toward the outlet tip, with an inner diameter expanding at an angle θ of 0.5 to 3.0 ° with respect to the longitudinal direction of the nozzle, and from the end of the throat portion. The paint peeling apparatus as described in any one of Claims 5-9 which has a shape whose ratio (B / A) of the length B to the said exit front-end | tip and the diameter A of the said throat part is 10 or more.

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