JPH1059523A - Method for preventing sticking of grain body to conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a grain body from sticking to a conveyor carrier surface by applying lubricant which makes the grain body difficult to stick to the conveyor carrier surface while a conveyor is operated so as to convey the grain body such as molding sand. SOLUTION: A carrier object is fed in a hopper 3 by driving a belt 2 and lubricant is continued to be sprayed to the contact of the belt 2 and a snap roller 8 by a sprayer 9 while a conveyor 1 is operated. Lubricant is stuck up to 20μm or below to the carrier surface of the belt 2 and the surface of the snap roller 8 and is rubbed in the carrier surface. When molding sand is mounted and transferred on/to the carrier surface of the belt 2 by the hopper 3 and the carrier surface is turned by a head pulley 4, molding sand is hit against a scraper 11, is made to fall by gravity and is moved to the next process. Because lubricant is applied to the carrier surface of the belt 2, molding sand is not stuck to the carrier surface. Lubricant is mainly composed of 1000st of dimethyl silicon oil and is emulsion in which this dimethyl silicone oil is mixed with nonionic system activator and is diluted up to coefficient of viscosity of 7cPs with water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing particles from adhering to a power transmission mechanism such as a conveyor surface or a feed roller when conveying particles such as foundry sand on a conveyor. .

[0002]

2. Description of the Related Art When particles are conveyed by a conveyor such as a belt conveyor or a bucket conveyor, the particles to be conveyed do not fall at the destination, and are conveyed on the surface of the conveyor belt of the belt conveyor or the inner surface of a bucket of the bucket conveyor. It may continue to adhere to the surface. Leaving the state in which the particles adhere to the conveying surface in this manner causes various problems as described below.

[0003] For example, if the belt is left attached to the surface of the conveyor belt, abnormal situations such as meandering, cracking, slipping of the belt may occur. When attached to the bucket inner surface of the bucket conveyor, the bucket volume is reduced. In any case, the transport efficiency is reduced. In addition, in the case of the belt conveyor or the bucket conveyor, if the granules do not fall at the planned destination, they fall at an unscheduled place and scatter as dust, thereby deteriorating the working environment.

[0004] In order to remove the particles attached to the conveyor surface of the conveyor as described above, hot water is sprayed on the belt surface (Japanese Utility Model Application Laid-Open No. 62-147614), and a scraper blade is pressed against the belt surface ( 6-20750
No.) etc. are known.

[0005]

However, even by the above-mentioned conventional method, it is actually difficult to remove the adhered particles. In addition, any of the above is a technique for removing particles that have already adhered to the conveying surface, and is not a technique for preventing the adhesion beforehand. And the adhesion prevention technology is not yet known. Therefore, an object of the present invention is to provide a method for preventing particles from adhering to a conveyor surface of a conveyor.

[0006]

SUMMARY OF THE INVENTION In order to achieve the object, a method for preventing the adhesion of particles to a conveyor according to the present invention comprises operating a conveyor to convey particles such as foundry sand on the conveyor. During this process, a lubricant is applied to the conveyor surface of the conveyor to make the particles hard to adhere.

According to the present invention, the lubricant is applied to the conveying surface during the operation of the conveyor so as to prevent the particles from adhering, so that the particles are prevented from adhering. In this respect, the method in which the anti-adhesion agent is previously applied to the transport surface but not applied during operation is different from the method in which the effect is lost after the anti-adhesion agent is peeled off. In the case of the present invention, since the coating is performed during the operation, the state in which the lubricant is applied to the conveying surface is always maintained.

[0008] As a method of coating, (1) a lubricant sprayer is placed on a conveyor track and sprayed on a transfer surface, or (2) a solid lubricant is placed on a conveyor track and rubbed directly on the transfer surface. And the like. The application step is preferably performed before the granules are supplied to the conveying surface or after the particles are discharged from the conveying surface. This is because a large amount of particles is placed on the conveying surface after the particles are supplied to the conveying surface and before the particles are discharged from the conveying surface.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS When a lubricant is applied by spraying, the lubricant may be sprayed directly on the conveying surface. However, in a power transmission mechanism for transmitting a driving force to a conveyor, an element in contact with the conveying surface, such as a tension roller, It is good to spray on a roller and apply it to a conveyance surface through them. The transport surface is microscopically uneven, but when the lubricant is rubbed into the concave portion by the roller, the transport surface becomes smooth. The coating thickness is preferably 20 μm or less. This is because the height of the irregularities on the transport surface is 20 μm or less. If the coating is applied to a thickness exceeding 20 μm, the conveyed material may be attached on the contrary.

The lubricant preferably contains a silicon resin as a main component. Further, a fluorine resin may be used as a main component. The lubricant is an aqueous solution and is preferably of an emulsion type. This is because if it is water-soluble, there is no danger of burning, and if it is an emulsion type, the components are uniformly dispersed.

When the conveyor is a belt conveyor,
A lubricant can be applied to the surface of the belt or roller.
When the conveyor is a bucket conveyor, the inner surface of the bucket can be lubricated.

[0012]

【Example】

-Example 1-An example of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a belt conveyor to which the first embodiment of the present invention is applied.

The conveyor 1 comprises an endless belt 2, a hopper 3, a scraper 11, and various pulleys or rollers as power transmission elements. The belt 2 is driven by a head pulley 4 that receives an output from a drive motor (not shown), and moves endlessly between the head pulley 4 and the tail roller 7 in the direction of the arrow while being guided by the carrier roller 5 and the return roller 6. During exercise, tension is applied to the belt 2 by a snap roller 8 rotatably fixed below the head pulley 4 to prevent loosening. The conveyed material input from the hopper 3 hits the scraper 11 and drops below the belt 2.

The above is a transfer apparatus using a normal belt conveyor. In the present example, the nozzle type injector 9 is placed ahead of the scraper 11 and the snap roller 8 in the traveling direction of the belt 2. In the nozzle type injector 9, dimethyl silicone oil 1000Cst as a main component, a nonionic activator is mixed with the mixture, and the clay 7 is mixed with water.
It is filled with an emulsion type lubricant diluted to cps.

When operating the conveyor 1, first, the belt 2 is driven. Then, the conveyed material is put into the hopper 3 and the lubricant is sprayed from the injector 9 toward the contact point between the belt 2 and the snap roller 8. During the operation of the conveyor 1, spraying is continued. Then, the lubricant adheres to the conveying surface of the belt 2 and the surface of the snap roller 8. The lubricant attached to the snap roller is rubbed on the transport surface. The casting sand falls from the discharge port of the hopper 3 and is placed on the conveying surface of the belt 2, and then moves together with the belt 2 in the arrow direction. However, when the belt 2 changes direction at the position of the head pulley 4, the foundry sand hits the scraper 11 and falls by its own weight from the conveying surface of the belt 2, and is moved to the next step (not shown). Since the above-mentioned lubricant is applied to the conveying surface of the belt 2, the molding sand does not stick to the conveying surface. Therefore, the belt 2 runs in a steady state for a long time. In addition, the casting sand does not scatter around the conveyor 1 and harm the working environment.

Example 2 This is an example in which a lubricant is applied by rubbing in a solid lubricant, unlike the lubricant applied in Example 1 by the injector 9. Except that the injector 9 is not installed, the same conveyor as the conveyor 1 of the first embodiment is used. Then, as shown in FIG. 2, a lubricant 12 made of a solid silicone resin is placed between the tail roller 7 and the carrier roller 5, and the lubricant 12 is pressed against the belt 2 in operation. Then, the lubricant 12 is rubbed on the surface of the belt 2.

The foundry sand adheres to the belt 2 and the belt 2
It is preferable that the tray 10 is arranged on the ground under the belt 2 in consideration of a case where the tray 10 falls before reaching the tail roller 7. According to the present invention, the tray 10 is used. Is rare.

[0018]

As described above, since particles can be prevented from adhering to the conveying surface of the conveyor, the conveying efficiency can be improved, the operation rate of the conveyor can be improved, the working environment can be protected, and the durability of the conveyor can be improved. And so on.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a method for preventing particles from adhering to a conveyor according to a first embodiment.

FIG. 2 is a diagram illustrating a method for preventing particles from adhering to a conveyor according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conveyor 2 Belt 3 Hopper 4 Head pulley 9 Nozzle type injector 12 Lubricant (solid)

Claims (7)

[Claims] 1. A conveyor, wherein the conveyor is operated to convey granules such as foundry sand and the like, and a lubricant is applied to a conveying surface of the conveyor so that the granules are hardly adhered to the conveyor. To prevent the adhesion of particles. 2. The method according to claim 1, wherein the lubricant is applied in a thickness of 20 μm or less. 3. The method according to claim 1, wherein the lubricant is applied via an element in contact with the conveying surface in a power transmission mechanism for transmitting a driving force to a conveyor. 4. The method according to claim 1, wherein the lubricant comprises a silicon resin as a main component. 5. The method according to claim 4, wherein the lubricant is an emulsion type aqueous solution containing a silicon resin as a main component. 6. The method according to claim 3, wherein the conveyor is a belt conveyor, and the element in contact with the conveying surface is a surface of a tension roller or a feed roller. 7. The conveyor according to claim 1, wherein the conveyor is a bucket conveyor.
The method of claim 1, wherein the transport surface is an inner bucket surface.