KR101424602B1 - Air Dryer For Synthetic Resins - Google Patents

Abstract

The present invention relates to a synthetic resin dryer for improving the quality of a synthetic resin by removing moisture contained in the synthetic resin. The synthetic resin dryer comprises a process chamber (1); an air supplying part (7); a raw material supplying part (9); a heating part (11) for heating supplied air; a flux controlling part (31) for controlling the amount of air supplied by the air supplying part (7); and a raw material discharging part (63) for discharging dried raw materials. A lower part of the process chamber (1) includes a convergence part (41) formed in a conical shape to have a cross section getting narrower toward the bottom. The air supplying part (7) includes an air supplying pipe (33) which is extended to the central lower part of the process chamber (1) by penetrating a side wall of the process chamber (1); and a diffuser (43) which is installed at the end of the air supplying pipe (33) and has an enclosure shape in order to uniformly diffuse induced heating air in the process chamber (1).

Description

Background Art [0002] Air dryer for synthetic resins

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dryer, and more particularly, to a synthetic resin material dryer for improving the quality of a synthetic resin product by removing moisture contained in the synthetic resin material using dry air.

The synthetic resin product is molded so as to have a specific shape by melting the raw material of the bead and pellet in the form of a synthetic resin, and then supplying it to the mold. Synthetic resin products are produced in a wide variety of forms such as films, pipes, rods, plate materials, and other molded products having three-dimensional shapes. In order to improve the surface accuracy (precision) and strength of synthetic resin products, the quality of the synthetic resin raw material becomes very important.

One of the important qualities of the quality of the synthetic resin raw material is the water content of the moisture, that is, the raw material of the synthetic resin (hereinafter referred to simply as the " raw material "). In general, it is preferable that the water content is low. This is because moisture is an important factor in generating bubbles in products during melting and molding.

In order to lower the water content, an air dryer using conventional heating air has been proposed. In order to solve various problems of the air dryer, Korean Utility Model Registration No. 20-0190908 (hereinafter referred to as "prior art") has been proposed. The prior art is intended to circulate high-temperature air in order to eliminate the disadvantage that the moisture removal rate varies depending on the humidity of the atmosphere. However, the prior art has paid attention to only the air inside the workplace, but can not completely remove the problem of the conventional air dryer since the self-characteristics of the synthetic resin raw material to be dried is not taken into consideration.

An object of the present invention is to provide an air dryer capable of lowering the water content of a synthetic resin raw material. More specifically, it is an object of the present invention to provide a synthetic resin material dryer capable of efficiently drying a raw material under optimal conditions by controlling information on the water content of the supplied synthetic resin material and controlling the supply amount and temperature of the air accordingly.

The above-mentioned object is achieved by a work machine comprising: a working chamber to which an exhaust port and a raw material inlet are connected; An air supply unit for supplying external air to the working chamber; A raw material supply unit for supplying a raw material of synthetic resin through the raw material input port; A heating unit for heating the air supplied to the working chamber; A flow rate control unit for controlling an air supply amount of the air supply unit; A raw material discharge portion for discharging the dried raw material;

A lower portion of the working chamber is provided with a converging portion which is conical so that the cross-section gradually narrows downward;

Wherein the air supply unit includes an air compressor for generating air pressure; An air filter for filtering foreign matter in the air; An air supply pipe extending through the side wall of the working chamber and extending to a central lower portion of the working chamber; And a diffuser installed at a distal end of the air supply pipe and having a shape of a housing so that the introduced heated air can be uniformly diffused into the working chamber.

According to an aspect of the present invention,

The flow control unit includes a control valve interposed in the middle of the air supply pipe. A valve body having an air inflow passage at an upper portion of one side of the control valve and an air exhaust passage at a lower portion of the other side so as to be adjacent to the air inflow passage in parallel with the partition wall; A plurality of through holes penetrating the partition wall for communicating the air inflow passage and the air discharge passage with each other; A plurality of valve plates arranged in parallel along the longitudinal direction of the valve body for controlling a flow rate through the valve body, the valve plates opening and closing the passage holes; And a valve actuating part for individually actuating the valve plate.

According to another aspect of the present invention, the heating unit includes:

A heating pipe to which a flange is attached at both ends and which is installed upright;

A rod-shaped heat transfer member which is inserted into the heating pipe to fill the hole and is made of magnesia (magnesium oxide) and has a plurality of bore-shaped holes perforated in various directions along the longitudinal direction;

And may include a heating wire penetrating the upper sidewall of the heating tube, penetrating the upper hole in one of the holes from top to bottom, and penetrating through the other hole from bottom to top to be installed in a U shape inside the heating pipe have.

In order to prevent the heating wire from being stretched by heating and flowing below the heating pipe, a finishing cap made of a magnesia having a plurality of holes formed therein can be closely fixed to the lower portion of the heat conducting body.

According to the above construction, a synthetic resin material dryer is provided which can be used in a dried state by removing moisture contained in the synthetic resin material. According to the present invention, there is provided a synthetic resin material dryer capable of maintaining a required water content constant by controlling the flow rate of heated air according to the individual moisture characteristics of the synthetic resin material.

1 is a structural view of a synthetic resin material dryer according to an embodiment of the present invention.
2 is a schematic perspective view of a synthetic resin material dryer according to an embodiment of the present invention.
3 is a sectional view of a working chamber of a synthetic resin material dryer according to an embodiment of the present invention.
FIG. 4 is a schematic cross-sectional view of a dehumidifying tower according to an embodiment of the present invention, and FIG. 5 is an exploded cross-sectional view thereof.
6 is a schematic cross-sectional view of a flow control valve according to an embodiment of the present invention.
7 is a cross-sectional view of a heating unit according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 basically, and other drawings are referred to where necessary.

A cylindrical working chamber 1 is installed upright. The working chamber 1 is provided with an exhaust port 3 and a raw material input port 5, respectively. The air supply unit 7 forcibly supplies the outside air to the inside of the working chamber 1. [ The raw material supply unit 9 supplies the raw material M of the synthetic resin through the raw material input port 5. The heating unit 11 heats the air supplied to the work chamber 1 by the air supply unit 7. [ The air supply unit 7 includes an air compressor for generating air pressure and an air filter for filtering foreign matter.

The degree of drying of the supplied air, that is, the absolute humidity, is an important factor for determining the degree of drying of the raw material. Therefore, the supplied air is primarily dried while passing through the first drying unit 13 (see FIG. 1) using the adsorption method. The first drying unit 13 absorbs moisture in the air using a membrane. The second drying unit 15 can be further provided if it is necessary to greatly reduce the absolute humidity of the air according to the characteristics of the raw material to be used and the user's need. The second drying unit 15 may be composed of two dehumidifying towers 17 and 19 as a method of using the water adsorption gel 23 (gel). The dehumidifying gel 23 always has a wetting property to contain a certain amount of water. Therefore, when the humidity of the surrounding air is high, it sucks moisture, and when it is low, it releases moisture.

The two dehumidifying towers (17, 19) are used alternately and absorb moisture from the passing air. The construction of the dehumidifying tower (17, 19) will be described with reference to FIG. 4 to FIG.

In the cylindrical dehumidifying tank 21, a spherical dehumidifying gel 23, which is a known material, is fully charged, and the air flows in from the lower portion and escapes to the upper portion. A cover plate (25) and a bottom plate (27) are provided at upper and lower ends of the dehumidification tank (21) with holes through which air can communicate. The spring 29 presses the gel plate 23 by pressing the cover plate 25 with a constant force. This is for keeping the gap between the gels 23 constant and at the same time preventing the gel 23 from being broken.

The upper part of the dehumidifying tank 21 is supported by the upper casing 22, and the lower part is supported by the lower casing 24. [ The two dehumidifying towers are supported by one upper casing 22 and a lower casing 24. The upper casing 22 and the lower casing 24 are supported by the support rods 26 so as to maintain a constant gap therebetween.

The two dehumidifying towers 17 and 19 are used alternately. For example, when the humidity of the first dehumidifying tower 17 exceeds a predetermined value, the second dehumidifying tower 19 relatively dry is used. The second dehumidifying tower 19 supplies the dry air to the place of use and at the same time supplies a part of the dehumidified air to the first dehumidifying tower 17 (for example, 20% of the flow rate) to lower the humidity of the first dehumidifying tower 17. When the humidity of the second dehumidifying tower 19 reaches a certain level, the first dehumidifying tower 17 is used again. The first dehumidifying tower 17 supplies dry air to the place of use and at the same time, the humidity of the second dehumidifying tower 19 . In this way, the gel 23 of the first and second dehumidifying towers 17 and 19 can be used for a long time like a rechargeable battery.

According to the present invention, a flow rate control unit 31 for controlling the air supply amount of the air supply unit 7 is provided. Hereinafter, description will be made with reference to FIG.

The present invention provides a system for removing moisture from a raw material (M) by supplying dried air to a raw material. The absolute humidity of the air to be supplied to the raw material M is constant, but the degree of drying of the raw material M can be adjusted by adjusting the supply flow rate.

The flow control unit 31 includes a control valve 35 interposed in the middle of the air supply pipe 33. The control valve 35 is provided with an air inflow path 36a at one upper portion and a partition wall 37a A valve body 37 provided with an air discharge passage 36b adjacent to the air inlet passage 36a so as to be adjacent to the air inlet passage 36a; A plurality of through holes (38a, 38b, 38c) punctured in the partition wall (37a) to communicate the air inflow path (36a) and the air discharge path (36b) with each other; A plurality of valve plates 39 for opening and closing the passage holes 38a, 38b and 38c, which are parallelly arranged along the longitudinal direction of the valve body 37 to control the flow rate passing through the valve body 37, ); And a valve actuating part 40 for individually actuating the valve plate 39. [ The valve operating portion 40 may be a pneumatic cylinder. Each valve plate 39 is vertically operated by the valve actuating part 40 attached to the valve body 37 so that each valve plate 39 is actuated in the direction perpendicular to the partition wall 37a. The flow rate is determined according to the number of openings of the valve plate 39. 6, when the third valve plate 39c is opened, the least amount of flow will flow, and when the first, second, and third valve plates 39a, 39b, and 39c are all opened, You will get through. The state in which the first and second valve plates 39a and 39b are opened is indicated by a dot-dash line. Therefore, depending on which valve plate 39 is selected and operated, the opening and closing degree of the pipe is determined, and thereby the flow rate is adjusted. The adjustment of the flow rate in such a stepwise manner (stair-stepwise) is also effective in economically providing the control valve 35, so that a non-specialist can conveniently set the flow rate. The number of valve plates and through-holes can be changed.

On the other hand, the lower portion of the working chamber 1 includes a conical converging portion 41 whose cross section is gradually narrowed downward as shown in Fig. 2 or Fig. The air supply pipe 33 extends through the upper portion of the side wall of the working chamber 1 to the lower center of the working chamber 1. A diffuser 43 is installed at the end of the air supply pipe 33 to diffuse the introduced air evenly into the working chamber 1. The diffuser 43 functions as a nozzle and allows air to be blown downward.

As mentioned, the drying air is heated by the heating portion 11 just before being supplied to the working chamber 1. [ The configuration of the heating unit 11 is also one of the features of the present invention. Hereinafter, description will be made mainly with reference to Fig.

The heating unit 11 includes a heating pipe 47 to which a flange 45 is attached at both ends and which is installed upright; The heating tube 47 is filled with a plurality of holes 51 having a bore shape along the longitudinal direction and made of magnesia magnesium, (49); Penetrates through the upper sidewall of the heating pipe 47 and passes through the hole 51a of the hole 51 from top to bottom and penetrates through the other hole 51b from the bottom to the bottom, And a heating wire 53 installed in a U-shape. This configuration is intended to minimize the temperature deviation of the air passing through the heating pipe 47. [

According to the embodiment of the present invention, in order to prevent the heating wire 53 from being stretched by heating under the heat transfer body 49 and flowing down below the heating pipe 47, the finishing cap 55 is attached to the heat transfer body 49 And is fixed tightly to the lower part. The finishing cap 55 is also made of a magnesia in which a plurality of holes 57 are drilled similarly to the heat transfer body 49. The lower end of the heating pipe 47 is pressed to form the pressing portion 59 in order to prevent the heat transfer body 49 and the finishing cap 55 from falling down from the heating pipe 47. The pressing portion 59 supports the heat transfer body 49 and the finishing cap 55 by reducing the diameter of the tube.

The dried and heated air supplied to the working chamber 1 adsorbs moisture from the raw material M and then is discharged to the outside through the air discharge portion 61. The working chamber is provided with a viewing window in the longitudinal direction for confirming the contents. The dried raw material M is supplied to a use place through a raw material discharging part 63 provided at the lower end of the working chamber 1. [ The place of use may be a pipe (U, see Fig. 2), a barrel or a mold. The raw material discharging portion 63 may be a natural discharge type by gravity or a rotary pump (not shown).

The user can set the dryer in advance according to the manual using the control panel 65. [ The manual provides a set of standards for the raw materials used (ABS, PC, PE, EVA, PET, etc.) and the desiccator for the desired absolute humidity. The setting standard of the dryer is basically the control amount of the flow rate control unit 31 and the heating temperature of the heating unit 11. [

The configuration shown and described above is merely a preferred embodiment based on the technical idea of the present invention. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention.

1: working chamber 3: exhaust port
5: Feed inlet 7: Air supply
9: raw material supply part 11: heating part
13, 15: first and second drying units 17, 19: dehumidifying tower
21: dehumidifying tank 23: gel
25: cover plate 27: bottom plate
29: Spring 31: Flow control unit
33: air supply pipe 35: regulating valve
37: valve body 39: valve plate
41: converging portion 43: diffuser
45: Flange 47: Heating pipe
49: heat transfer body 51: hole
53: heating wire 55: finishing cap
59: a pressing part 61:
63: raw material discharging part 65: control panel
M: raw material U: piping (where used)

Claims (4)

A work chamber (1) to which an exhaust port (3) and a raw material input port (5) are connected; An air supply part (7) for supplying external air to the working chamber (1); A raw material supply part 9 for supplying a raw material of synthetic resin through the raw material input port 5; A heating unit 11 for heating the air supplied to the working chamber 1; A flow rate control unit 31 for controlling the amount of air supplied by the air supply unit 7; And a raw material discharge portion (63) for discharging the dried raw material;
A lower portion of the working chamber 1 is provided with a converging portion 41 having a conical shape so as to be gradually narrowed in cross section;
The air supply unit (7) includes an air supply pipe (33) extending through the side wall of the working chamber (1) to the lower center of the working chamber (1); And a diffuser (43) installed at a distal end of the air supply pipe (33) and having a shape of an enclosure so that the introduced heated air can be evenly diffused into the work chamber (1);
The flow control unit (31) includes a control valve (35) interposed in the middle of the air supply pipe (33);
The control valve (35) comprises:
A valve body 37 provided with an air inflow passage 36a at an upper portion thereof and an air discharge passage 36b adjacent to the air inflow passage 36a in parallel with the air inflow passage 36a with a partition wall 37a therebetween, ;
A plurality of through holes (38a, 38b, 38c) punctured in the partition wall (37a) to communicate the air inflow path (36a) and the air discharge path (36b) with each other;
38b and 38c for opening and closing the passage holes 38a, 38b and 38c, which are provided in parallel along the longitudinal direction of the valve body 37 to control the flow rate through the valve body 37, 39);
And a valve actuating part (40) for individually actuating the valve plate (39).
delete The apparatus of claim 1, wherein the heating unit (11) comprises:
A heating pipe 47 having flanges 45 attached to both ends thereof and installed upright;
The heating tube 47 is filled with a plurality of holes 51 having a bore shape along the longitudinal direction and made of magnesia magnesium, (49);
Penetrates through the upper sidewall of the heating pipe 47 and passes through the hole 51a of the hole 51 from top to bottom and penetrates through the other hole 51b from the bottom to the top of the heating pipe 47, And a heating wire (53) installed in a U shape in a U shape.
The method of claim 3,
In order to prevent the heating wire 53 from being stretched by heating and flowing down below the heating pipe 47, a finishing cap 55 made of magnesia with a plurality of holes 57 is formed on the heat conducting body 49 ) Of the synthetic resin material (1).

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