JP6007465B1 - Zinc coating blasting equipment - Google Patents

Abstract

An object of the present invention is to provide a blasting apparatus for forming a zinc coating which is efficient and enhances the productivity and improves the safety of the conventional blasting apparatus for forming a zinc coating. As a pretreatment, a first blasting apparatus for applying a satin finish to the surface of a workpiece, and as a posttreatment, a projection material containing zinc or a zinc alloy is projected onto the surface of the workpiece, and zinc is applied to the surface of the workpiece. Alternatively, a zinc coating forming blasting device comprising a second blasting device for forming a zinc alloy coating is provided. [Selection] Figure 2

Description

  The present invention relates to a blasting apparatus for forming a zinc coating for forming a coating made of zinc or a zinc alloy on a workpiece which is a projection object.

  As a means for subjecting machine parts such as automobile parts to surface treatment such as rust prevention treatment, generally, a film made of zinc or a zinc alloy is formed on the surface of a workpiece before forming. Specifically, by continuously projecting a zinc-based projectile with steel as the core toward the surface of the workpiece, the zinc peels off from the projectile and gradually accumulates on the workpiece, resulting in a zinc coating on the workpiece surface. It is formed. This type of blasting apparatus uses a pneumatic wheel and a centrifugal wheel.

JP-A-61-178179

  However, in recent years, as the diameter of the projection material has been reduced to form a high-performance coating, the projection time has greatly increased, and the accessories such as the cyclone separator have become high-performance, resulting in an increase in the size of the blasting device. In spite of the high cost, the blasting apparatus is inefficient and reduces productivity. Moreover, the blasting apparatus for forming a zinc coating requires a long time to form a coating on a workpiece. The projection material with the zinc coating is subject to temperature rise due to friction, collision between zinc and the workpiece, or the like. The possibility of ignition etc. was pointed out due to dust generated by long-time projection.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to improve the efficiency, productivity, and safety of a zinc coating forming blasting apparatus for a conventional zinc coating forming blasting apparatus. An object is to provide an apparatus.

  As a result of ingenuity, the present inventor performed a satin finish on the surface of the workpiece in a normal blasting process using a first blasting device as a pretreatment for the zinc coating forming blasting device, and roughens the workpiece surface in a short time. Next, it is possible to form a high-quality coating in a short time by performing a blasting step with a projection material mainly composed of zinc or a zinc alloy by a second zinc coating forming blasting device. I found it. In addition, in the case of a projection material mainly composed of zinc, an effective control and management method for the circulation state of the projection material has been devised in consideration of the fact that dust is easily oxidized and easily generates heat.

  That is, the present invention projects the first blasting device that performs a satin finish on the surface of the workpiece as a pretreatment, and projects a projection material containing zinc or a zinc alloy on the surface of the workpiece as a posttreatment, And a second blasting device for forming a zinc or zinc alloy coating.

In the blast apparatus for forming a zinc film of the present invention, the second blast apparatus has means for removing and cooling the projected projection material outside the projection chamber.
Thereby, the danger of the ignition by the dust of the projection material containing zinc or a zinc alloy can be prevented.

  In the blast apparatus for forming a zinc film of the present invention, the second blast apparatus includes a temperature sensor that measures a temperature in the projection chamber and / or a dust concentration sensor that measures a dust concentration in the projection chamber, the temperature sensor, and / or And a means for controlling the output of the cooling means in accordance with the measured value of the dust concentration sensor.

In the blast apparatus for forming a zinc coating according to the present invention, the projection material made of zinc or a zinc alloy contains calcium carbonate or dry ice.
Conventionally, coolants such as calcium carbonate and dry ice have been put into the dust collector installed together, but in the present invention, there is a risk of ignition of dust by putting coolant directly into the blasting device for zinc coating formation. It is possible to reliably prevent the property.

  In the first blasting apparatus, the present invention projects a projecting material containing zinc or a zinc alloy on the surface of the workpiece in the pretreatment step of performing a satin finish on the surface of the workpiece and in the second blasting apparatus. The present invention provides a zinc film forming blasting method for performing a post-treatment step of forming a zinc or zinc alloy film on the workpiece surface.

The zinc film forming blasting method of the present invention is characterized in that, in the second blasting apparatus, the projected projection material is removed outside the projection chamber and cooled.
Thereby, the danger of the ignition by the dust of the projection material containing zinc or a zinc alloy can be prevented.

  In the zinc film forming blasting method of the present invention, the second blasting apparatus includes a temperature sensor that measures the temperature in the projection chamber and / or a dust concentration sensor that measures the dust concentration in the projection chamber, and the temperature sensor and / or The output of the cooling means is controlled according to the measurement value of the dust concentration sensor.

In the zinc film forming blasting method of the present invention, the projection material made of zinc or a zinc alloy contains calcium carbonate or dry ice.
Conventionally, coolants such as calcium carbonate and dry ice have been put into the dust collector installed together, but in the present invention, there is a risk of ignition of dust by putting coolant directly into the blasting device for zinc coating formation. It is possible to reliably prevent the property.

It is a side view of the normal blasting apparatus used as a pretreatment. It is a side view of the blast apparatus for zinc film formation. It is the rear view which looked at the blast apparatus shown in FIG. 2 from the back surface. It is a figure which shows schematic structure of a projection material stirring apparatus.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out a blasting apparatus according to the present invention will be described in detail with reference to the drawings.
<First Embodiment>
<Configuration>
1 to 3 are diagrams illustrating an embodiment of the present invention. Here, FIG. 1 is a side view of a normal blasting apparatus used as a pretreatment in this embodiment.

  As shown in FIG. 1, in a normal blasting apparatus, a nozzle 2 for blasting a workpiece 1, an abrasive suction duct 4 for sucking up a projected projection material upward, and a reusable projection material and dust are separated. The cyclone type separation device 3 is configured. First, the surface of the workpiece 1 is textured by performing blasting using a projectile (sand, shot, grid, alumina, etc.) on the workpiece 1 that is the object to be cleaned. In this case, the projected projection material falls to the hopper, is sucked up by the abrasive suction duct 4, separates the projection material and dust that can be reused by the cyclone separator 3, and the dust is collected in a dust collector (not shown). Discharge.

  Next, as a post-treatment, the blast apparatus for forming a zinc film shown in FIGS. Here, FIG. 2 is a side view of the blasting apparatus for forming a zinc coating, and FIG. 3 is a rear view of the blasting apparatus shown in FIG. 2 as viewed from the back side. It represents the same thing, and a basic structure and operation | movement shall be the same.

  As shown in FIG. 2, the blast apparatus for forming a zinc coating is a nozzle 12 for continuously projecting a projection material on a workpiece 11 whose surface has been textured in the pretreatment described above, and generates heat in a high temperature state. The elevator packet 5 for lifting up the projected projection material that has been projected, and the raised projection material are configured by a system that lowers the temperature of the projection material by the projection material agitator 6. A blower and a cooler (not shown) are installed in the projection material agitator 6.

<Operation>
The workpiece 11 shown in FIG. 2 is a machine part whose surface has already been textured by the blasting device shown in FIG. As a post-processing step in this embodiment, a projection material made of zinc or zinc-based alloy with steel as a core is projected.
In the case of this projection material, because a large amount of zinc-based dust with a risk of ignition is generated, after lifting in the elevator packet 5 for each projection material, in the projection material agitator 6 schematically shown in FIG. The projection material in the recovered projection material is agitated, and the projection material whose temperature has been lowered by the secondary air, the blower, or the air conditioner is stored in the projection material stock tank 7.

  In the blast apparatus for forming a zinc film in the present embodiment, the surface of the machine part is processed in advance so that the film easily adheres in the previous step. Therefore, it becomes possible to form a zinc coating of a machine part with good quality in a short time by continuous projection of the projection material from the nozzle 12 by a blast device for forming a zinc coating as a post process.

  In the subsequent process, a large amount of zinc dust is generated and heat is generated at the same time as the zinc coating is formed. However, this dust is not sucked by the abrasive suction duct 4 shown in FIG. 1, and the projected projection material is lifted upward by the elevator packet 5 shown in FIG. 3, so that there is no danger of ignition and the like. Can be secured. Further, unlike the cyclone type separation device, the projection material stirring device 6 shown in FIG. 2 not only separates the reusable projection material and dust, but also cools the reusable projection material safely by air cooling. It becomes possible.

  In particular, in order to perform this air cooling effectively, the cycle time of the work can be greatly shortened by applying a blower or a cooling device (not shown). In addition, in a zinc film forming blasting device, a certain amount of calcium carbonate or dry ice is mixed with a zinc or zinc-based alloy projection material with steel as a core, thereby suppressing heat generation and ensuring further safety. It becomes possible.

<Second Embodiment>
In addition, a temperature sensor and a dust concentration sensor (not shown) are provided, and when the heat generation reaches a threshold value, it is possible to have a feedback control function for starting the blower and the air conditioner. Further, by PID control, it is possible to further enhance safety by operating the air conditioner at full speed when cooling rapidly, and operating the air blower at low speed when slow cooling is acceptable.

  The blast apparatus for forming a zinc film of the present invention can be widely used in the processing industry for applying a zinc film for rust prevention or the like.

DESCRIPTION OF SYMBOLS 1,11 ... Work 2,12 ... Nozzle 3 ... Cyclone separator 4 ... Grinding material suction duct 5 ... Elevator packet 6 ... Projection material stirring device 7 ... Projection material stock tank

Claims (4)

As a pretreatment, a first blasting device for performing a satin finish on the surface of the workpiece,
As a post, by projecting blast material containing zinc or zinc alloy on the surface of the workpiece, Ri Do and a second blasting apparatus for forming a coating of zinc or zinc alloy on the workpiece surface,
The zinc or zinc alloy blasting material contains calcium carbonate,
The second blasting apparatus is a zinc coating forming blasting apparatus having means for removing and cooling the projected projection material outside the projection chamber . The second blasting apparatus includes a dust concentration sensor for measuring a temperature sensor及beauty projecting morphism dust concentration in the room for measuring the temperature of the projection room, the cooling in accordance with the measured value of the temperature sensor及beauty powder dust concentration sensor The blast apparatus for forming a zinc coating according to claim 1 , further comprising means for controlling the output of the means. In the first blasting apparatus, a pretreatment step of performing a satin finish on the surface of the workpiece;
In the second blasting apparatus, in a zinc coating forming blasting method , a projecting material containing zinc or a zinc alloy is projected onto the surface of the workpiece, and a post-processing step of forming a coating of zinc or a zinc alloy on the workpiece surface is performed . ,
The zinc or zinc alloy blasting material contains calcium carbonate,
In the post-processing step in the second blasting apparatus, the projected projection material is removed from the projection chamber and cooled, and the zinc coating forming blasting method is characterized. In the second blasting apparatus, comprising a dust concentration sensor for measuring the temperature sensor及beauty projecting morphism dust concentration in the room for measuring the temperature of the projection room, measuring of the temperature sensor及beauty powder dust concentration sensor in the post-processing 4. The zinc film forming blasting method according to claim 3 , wherein the output of the cooling means is controlled according to a value.