JPS60221198A - Cleaning method in plunger type extruder - Google Patents

Abstract

PURPOSE:To remove and clean easily the flux remaining in an extruder in short time by charging the ice cake of a cylindrical shape into a cylinder and pressing the ice cake by a plunger. CONSTITUTION:The ice is preliminarily molded to a cylindrical shape like flux cake. A die adjusting holder 8 is then detached and a nipple 3 for a core guide is removed then the ice cake 4 is charged into the cylinder 2. The flux remaining in a die block holder 1a and a die block 1 is extruded when the plunger 6 is pressed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning method in a plunger type extruder for manufacturing coated welding rods, and more particularly, to a method that can efficiently and almost completely remove residual flakes in a cylinder. It is something.

As an extruder for producing a coated welding rod by applying a coating material to the outer periphery of a welding rod core wire, a plunger type extruder as shown in FIG. ff11, for example, is commonly used. That is, in the figure, 1 is a Gui block, la is a Gui block holder, 2 is a cylinder, 3 is a core wire guide nipple, 4 is a flux cake, 5 is a hydraulic cylinder, 6 is a plunger, and 8 is a die adjustment holder. 2, connect the Gui block l via the Gui block holder 1a, and install the core wire guide nipple 3 into the Gui block l,
In addition, a die adjustment holder 8 is attached to the tip of the Gui block 1, and flux cakes 4, which have been preformed to have approximately the same diameter as the inner diameter of the cylinder 2, are inserted into the charging port 2a in a number corresponding to the production quantity (three in the figure). Load into cylinder 2.

Next, while pressing the flux cake 4 by advancing the plunger 6 to the right in the drawing, flux is applied to the outer periphery of the welding rod core wire W discharged at a constant speed from the core wire guide nipple 3 to form a coated welding rod. 9 are manufactured.

By the way, when using an extruder for producing coated welding rods as described above, when changing the brand of welding rod, it is necessary to stop the production of the previous brand and completely remove the flux of the previous brand remaining or attached to the extruder. Removal - Must be cleaned. However, as can be easily understood from FIG.
Since the flux of the previous brand remains in the Gui block l and the die block holder 1a, it must be scraped out eventually. Then, the plunger 6 is pulled out from the cylinder 2a, and the die adjustment holder 8 at the tip of the Gui block l is removed.
Next, the remaining flux inside the manufacturing equipment is removed by scraping it out from the tip side of the Gui Block I, and the inside is further cleaned by washing with water and blowing air.

However, since flux cake 4 is made by adding water glass, etc. to flux, it is highly sticky and can easily absorb residual flux.
The flux easily adheres firmly to the inner wall of the extruder 4, and it requires a great deal of effort and time to completely remove and clean the flux.

The inventors of the present invention were concerned about the above-mentioned situation and conducted various studies to solve the problem. In other words, it goes without saying that the biggest cause of the above situation is the tackiness of the flux, but it is originally necessary for the flux to have at least the level of tackiness required for painting, so the tackiness of the flux is reduced. It's hard to think of a solution to this.

The next possible important reason is Gui Block Holder 1
It seems that the flow path cross-sectional area of a and Gui block l is gradually curved and reduced in the flow direction of the flux, and the nipple 3 is arranged, so it seems that the plunger 6 cannot be pushed all the way. It will be done. In other words, it is necessary to find some way to solve the current situation in which the current plunger system cannot completely discharge the flux that has been forced inside these plungers. Therefore, the present inventors thought that it would be possible to push the residual flux using some kind of inclusion, and if a plastic material was installed in the cylinder 2 instead of the flux cake 4 and pushed out by the plunger 6, the Gui block holder 1a and Gui Block 1
Based on the guideline that it should be possible to extrude the flux 4 remaining inside the tube, we began to consider specific means. However, in this case, even if the residual flux can be extruded, the plastic material will remain in the Guipro Aku 1 etc.
There is a requirement that it must be able to be easily removed from the die block 1 after exiting, and it must be made of a plastic material that is hard enough to scrape off the flux cake that is on the inner wall of the die block 1. There is also a requirement that it not be possible.

The present invention was completed as a result of repeated studies on a plastic material that satisfies the above requirements, and it is possible to easily, quickly and efficiently remove the flux of the previous brand that remains in the extruder when changing the brand of welding rod. Those who can clean as well as regular people,
This is what we are trying to provide.

The scavenging method (11') of the present invention, which has achieved the above first objective fj), is to charge a cylindrical ice cake into a cylinder,
The gist is that the residual flux is pushed out from the tip of the Gui block by pressing with a plunger.

That is, before charging water into the cylinder 2, ice is previously formed into a cylindrical shape similar to a flux cake. Next, the die adjustment holder 8 is removed, the core wire guide nipple is pulled out, and the ice cake charged as described above is gradually pushed to the innermost part of the cylinder with a plunger, so that the outer peripheral edge of the cylindrical ice cake touches the inner wall of the cylinder 2. As a result, the flux cake adhering to this area is scraped off. As the cylindrical ice cake is pushed further, the tip of the cake will be forced into the narrow passage inside the Gui Block l, and will be subjected to pressure from the surroundings of the passage, causing it to gradually deform by itself. At the same time, a part of it melts from the outer peripheral surface and enters the Gui block 1. The entire flux cake 4 remaining inside the die-pro-ac 1 etc. is pushed out from the tip of the Gui-block 1 by the push from the tip surface of the ice cake, but at this time, the flux cake 4 remaining inside the die-block holder 1a and the Gui-block l is pushed out. The flux adhering to the inner wall is also scraped off and extruded by the outer periphery of the ice cake in the same manner as described above. On the other hand, when the discharge of the residual flux is completed and the tip of the deformed ice cake reaches the tip opening of the die block 1, it is necessary to pull out the ice cake. After that, push the protruding tip of the ice cake back toward the cylinder 2. If necessary, remove the ice cake at the tip of Gui Block 1 (
The undercut part) may be slightly scraped off, but in any case, the outermost surface of the ice cake filled in the die block 1 will be exposed to heat from friction with the die block walls, etc. Due to heat transferred from outside, etc.
The ice cake melts quickly, and water is present at the interface between the ice cake and the ice plate wall, making it slippery, so the ice cake returns to the cylinder 2 side by pushing the tip slightly, and then the ice cake returns to the cylinder 2 side. It can be returned to the edge and easily pulled out. After the ice has been removed, air is blown into the extruder to remove water and the like adhering to the inner walls of the cylinder 2, etc., and preparations for production of the next brand can be started.

There are no particular restrictions on the type of ice that can be applied to the present invention, and commercially available ice can be used, but ice produced by rapid freezing has less deformation resistance, so it is preferable to use such ice as much as possible. It is recommended that It should be noted that the pressing force of the plunger 6 when pushing in while deforming the ice cake does not require particularly excessive force, and varies depending on the shape of the Gui block, but it is about 0.5 to 7 kg, or about 7 kg.

If the flux discharged from the die block 1 is stored in a wet state mixed with the water produced by the merchant's melting, it can be used without waste when reproducing the brand flux.

When molding the cylindrical ice cake used in the present invention, it is recommended that a compression molding machine for molding flux cakes as shown in FIG. 2 be used as is. That is, when molding a cylindrical ice cake, a small block of ice about 15 cm square is introduced into the molding machine cylinder 11 from the hopper 10, and the piston 12 is pushed from the solid line position to the two-dot chain line position to place it between the shielding board 13. Cylindrical ice cake B can be easily obtained by pressure molding. Although the compression molding machine used here also has the problem of residual sticking of flax to the inner surface of the cylinder 11 of the molding machine when producing flax cakes, the compression molding machine for flax cake molding is used to mold cylindrical water cakes. If this is also used, the inside of the molding machine cylinder 11 can be cleaned at the same time as water cake molding. The present invention can also be applied to cleaning the inside of a plunger type extruder (such as a plastink extruder) other than those used for manufacturing welding rods.

The present invention is constructed as follows. When cleaning the inside of the extruder, a cylindrical ice cake is charged into the cylinder, and the residual flux is pushed out from the tip of the Gui block by pressing it with a plunger. There is no need to manually scrape out the residual flux, and the cleaning can be carried out in a short time and with little effort.

[Brief explanation of drawings]

Figure 1 is a sectional view of an extruder for explaining the method of the present invention, Figure 2
The figure is a sectional view of an ice cake pressure 1ii molding machine according to the present invention. 1... Gui block 2... Cylinder 3... Nipple 4... Flux cake 5... Hydraulic cylinder 6... Plunger 8... Adjustment holder 9.
... Welding rod 10 ... Hopper 11 ... Forming machine cylinder 12 ... Screws) 13 ... Shielding board Applicant Kobe Steel, Ltd.

Claims (1)

[Claims] A method for cleaning the inside of a plunger type extruder for manufacturing coated welding rods, in which a cylindrical ice cake is charged into the cylinder, and residual franks are pushed out from the tip of the die block by pressing the ice cake with a plunger. A distinctive method of cleaning inside a plunger type extruder.