JPH0513708U - Molding material transfer device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a molding material conveying apparatus capable of suppressing the occurrence of clogging of pellets at a connecting portion between a stock portion and a tube. [Structure] A granule 12 which is a molding material is connected to a molding machine 24 by a tube 22 which sends the molding material to the molding machine 24, and a stock section 10 for storing the pellets 12 therein.
And a first compressed air introducing portion 20 for introducing the first compressed air into the stock portion 10 and for injecting the first compressed air toward the molding machine 24, and the tube 22. A second compressed air is introduced midway or between the tube 22 and the stock portion 10 and the second compressed air is introduced.
And a second compressed air introducing section 28 for injecting the compressed air in the direction of the molding machine 24.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a molding material conveying device, and more specifically, a stock part for storing granular pellets as a molding material and a molding machine are connected by a tube, and the pellets stored in the stock part are passed through the tube. And a molding material conveying device for conveying the molding material to the molding machine.

[0002]

[Prior Art]

 For example, as a method of supplying granular resin pellets, which is a molding material, to a heating cylinder of an injection molding machine, a method of conveying pellets by using fluid pressure of compressed air is used. A large number of pellets are stored in the stock section in advance. This stock part is connected to the heating tube of the molding machine by a flexible tube. When compressed air is supplied from the compressor to the connection part between the stock part and the tube, the lightweight pellets that have spontaneously dropped from the stock part to the connection part are pushed by the fluid pressure of the compressed air, and the pellets move the tube. And is conveyed to the molding machine.

[0003]

[Problems to be solved by the device]

 However, the above-mentioned conventional molding material conveying device has the following problems. A large amount of pellets are stored in the stock part, and a large amount of pellets try to move from the stock part into the tube by spontaneous fall. However, since the cross-sectional area of the conduit is small at the connection part between the stock part and the tube, pellets may clog at this part. In particular, in the case of a rough material having a pellet particle size of 3 mm or more, the clogging phenomenon occurs frequently. If clogging occurs, the smooth supply of molding material becomes impossible, and it is necessary to stop the molding work and release the clogging, which causes a problem of impeding productivity. Therefore, it is an object of the present invention to provide a molding material conveying device capable of suppressing the occurrence of pellet clogging at the connecting portion between the stock portion and the tube.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention has the following configuration. That is, the molding machine is contacted with a granular pellet as a molding material by a tube for sending the molding machine to the molding machine, and a stock section for storing the pellet and a first compressed air stocked in the stock section. A second compressed air is introduced between the tube and the stock part, and the first compressed air introduction part for injecting the first compressed air in the molding machine direction while introducing the compressed air into the tube part or the tube and the stock part. And a second compressed air introducing portion for injecting the second compressed air toward the molding machine.

[0005]

[Action]

 The operation will be described. When the first compressed air is introduced into the stock section and injected toward the molding machine, the pellets in the stock section are pushed toward the tube by the fluid pressure of the first compressed air. When the second compressed air is introduced and the second compressed air is injected in the direction of the molding machine, the stock part side of the second compressed air introduction part becomes a negative pressure, so the pellets in the stock part are compressed by the second compressed air. Suctioned in the direction of the inlet. Since the pellets in the stock part move toward the molding machine by the pushing force of the first compressed air and this suction force, clogging of pellets between the stock part and the tube is less likely to occur.

[0006]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, the configuration will be described with reference to FIG. A stock portion 10 is capable of storing granular synthetic resin pellets 12 which is a molding material therein. The stock unit 10 includes a hopper 14 that stores a large amount of pellets 12, and a temporary storage unit 16 that is provided below the hopper 14 and that temporarily stores the pellets 12 that are dropped from the hopper 14 and that are conveyed. Become. Although the hopper 14 and the temporary storage section 16 are connected to each other, the shutter 18 can be used to cut off the connection so that the amount of the pellets 12 dropped from the hopper 14 to the temporary storage section 16 can be adjusted. .. Reference numeral 20 is a first air import, which is a first compressed air introduction portion, and introduces the first compressed air into the temporary storage portion 16 and moves the first compressed air toward the molding machine 24 (left side in the drawing). It is ready for injection. By introducing and injecting the first compressed air into the temporary storage section 16, the pellets 12 present in the temporary storage section 16 can be pushed toward the molding machine 24 direction by the fluid pressure of the first compressed air. .. Reference numeral 22 denotes a tube, which is made of a flexible synthetic resin and has an inner diameter that allows the pellet 12 whose inside is pressed by compressed air to be sufficiently movable. The tube 22 communicates between the temporary storage unit 16 and a heating cylinder (not shown) of the molding machine 24.

Reference numeral 26 denotes an ejector portion, which is provided at a connecting portion between the tube 22 and the temporary storage portion 16 (or in the middle of the tube 22). The ejector unit 26 introduces the second compressed air introduced from the second air import 28, which is the second compressed air introducing unit, into the tube 22 and ejects the introduced second compressed air toward the molding machine 24. It is provided to let you. The structure of the ejector unit 26 will be described with reference to FIG. The ejector portion 26 is formed by connecting a cylindrical first member 30 and a second member 32 via bolts 34. Flow paths 36 and 38 of the pellet 12 are formed at the center of both the first member 30 and the second member 32, and the flow paths 36 and 38 are connected to each other. The pellet 12 moves in the flow paths 36 and 38 in the arrow direction. A stocker 10 side (right side in the drawing) end 40 of the flow path 36 of the first member 30 has an inner surface formed in a reverse taper shape, and a molding machine for the flow path 38 of the second member 32 formed on the protrusion. The 24 side (left side in the drawing) end portion 42 projects into the end portion 40. A gap 44 communicating with the flow path 36 is formed between the ends 40 and 42. A space 46 communicating with the gap 44 is formed outside the end portion 42, and a space 46 communicates between the gap 44 and the second air import 28. With this configuration, the second compressed air introduced from the second air import 28 is injected into the flow path 36 through the space 46 and the gap 44. At that time, since the injection port of the gap 44 is open toward the molding machine 24, the second compressed air is injected toward the molding machine 24. The first member 30 is provided with a third air import 48. The third air import 48 opens in the flow path 36, and the opening direction is a direction perpendicular to the direction of the flow path 36. There is. The third air import 48 is provided to clean the flow passages 36 and 38 of the ejector unit 26, and when the third compressed air is introduced from the third air inlet 48, the third compressed air flows into the flow passage. Since the fuel is injected from the opening in the molding machine 24 toward both the molding machine 24 and the stock portion 10, the pellets 12 and foreign matters clogged in the flow paths 36 and 38 can be removed.

Subsequently, in FIG. 1, reference numeral 50 denotes a compressor, which generates compressed air to be sent to the apparatus of this embodiment as first, second, and third compressed air. Reference numeral 52 is a regulator, which maintains and adjusts the pressure created by the compressor 50 to a suitable pressure as the first, second, and third pressures. Reference numerals 54 and 56 are electromagnetic valves, which open and close a pneumatic circuit between the regulator 52 and the first air import 20, the second air import 28, and the third air import 48. In this embodiment, the first compressed air circuit introduced into the first air import 20 and the second compressed air circuit introduced into the second air import 28 are opened and closed at the same time by one electromagnetic valve 54. However, they may be opened and closed separately. Next, the operation of the molding material conveying apparatus configured as described above will be described. When the electromagnetic valve 54 is opened while the electromagnetic valve 56 that opens and closes the third compressed air circuit introduced into the third air import 48 is closed, the compressed air becomes the first air import 20 and the second air import. It is simultaneously supplied to 28 as the first compressed air and the second compressed air.

The first compressed air entering the temporary storage section 16 from the first air import 20 pushes the pellets 12 existing in the temporary storage section 16 toward the molding machine 24 by the fluid pressure. On the other hand, the second compressed air that has entered the ejector portion 26 from the second air import 28 exists in the ejector portion 26, and the fluid pressure of the first compressed air causes the fluid pressure of the pellet 12 moving toward the molding machine 24. Pushes further toward the molding machine 24. In addition, when the second compressed air is injected in the ejector section 26 toward the molding machine 24, the stock section 10 side becomes a negative pressure, so that the pellets 12 in the stock section 10 are sucked toward the ejector section 26. .. The pellet 12 easily moves toward the molding machine 24 due to both the suction force and the fluid pressure of the first compressed air, so that the pellet 12 is less likely to be clogged. The pellets 12 pushed and sucked by the first and second compressed air are conveyed to the molding machine 24 through the temporary storage unit 16, the ejector unit 26, and the tube 22. When the ejector portion 26 is clogged with pellets 12 or foreign matter, the electromagnetic valve 54 is closed and the electromagnetic valve 56 is opened, so that the third compressed air is introduced from the third air import 48 into the ejector portion 26. As described above, it is possible to remove the pellets 12 and foreign substances clogged in the ejector portion 26 by the fluid pressure. Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. For example, when compressed air is dried by an air dryer and then supplied, moisture absorption of the molding material is prevented. It goes without saying that many modifications can be made without departing from the spirit of the invention, such as suppression.

[0010]

[Effect of the device]

 When the molding material conveying device according to the present invention is used, when the first compressed air is introduced into the stock part and jetted toward the molding machine, the pellets in the stock part are pushed in the tube direction by the fluid pressure of the first compressed air. Be moved. Further, when the second compressed air is introduced and the second compressed air is injected toward the molding machine, the stock portion side of the second compressed air introducing portion becomes a negative pressure, so that the pellets in the stock portion have the second compressed air. It is sucked toward the compressed air introduction part. Since the pellets in the stock section move toward the molding machine by the pushing force of the first compressed air and this suction force, clogging of pellets between the stock section and the tube is less likely to occur. The phenomenon can be suppressed and the smooth supply of molding material can be maintained. As a result, the frequency of stopping the molding operation is reduced and the productivity is improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a configuration of an embodiment of a molding material transport device according to the present invention.

FIG. 2 is a sectional view of an ejector portion.

[Explanation of symbols]

 10 Stock Part 12 Synthetic Resin Pellet 20 First Air Import 22 Tube 24 Molding Machine 28 Second Air Import

Claims (1)

[Scope of utility model registration request] 1. A stock unit for communicating granular pellets, which is a molding material, to the molding machine by a tube for feeding the molding machine, and a stock section for storing the pellets, and a first compressed air provided in the stock section. Is introduced into the stock portion, and a second compressed air is injected between the first compressed air introducing portion for injecting the first compressed air toward the molding machine and the tube, or between the tube and the stock portion. A molding material conveying device, which is provided with a second compressed air introducing portion for introducing the second compressed air toward the molding machine.