KR100361937B1 - A Device of Molding Rectangular Tube for Corrugated Pipe - Google Patents

Abstract

The present invention is configured to quickly cure the outer surface of the small circular tube extruded and supplied from the die to the required hardness to guide to the sizing side, so as to obtain a more precise and uniformly shaped small square tube, It is to provide a molding apparatus of a small square tube to maximize the productivity by improving the efficiency of the molding of small square tube.

The molding apparatus of the small square tube of the present invention has a die 10 for continuously extruding the small circular tube 3 by having an arc-shaped melt resin passage 11 therein and disposed in front of the die 10. Sizing having a vacuum box 20 which is installed to maintain a vacuum state therein, and a rectangular sizing passage 31 installed in the vacuum box 20 and having suction holes 32 formed at predetermined intervals ( 30) and a guide cooling means (40) disposed at the front inlet of the vacuum box (20) and having a guide passage (41) communicating with the sizing passage (31) and configured to pass water through the cooling water. The guide cooling means 40 includes a plurality of cool water inlet holes 42 and a coolant discharge hole that are radially drilled to face each other in a single set centering on an arc-shaped guide passage 41 formed at a central portion thereof. ), And in the guide passage 41 The cooling water inlet hole 42 and the cooling water discharging hole 43 to be communicated to a central portion so that the back of the open space so formed through the cooling water space (44) is secured to the larger diameter than the guide path 41.

Description

Small square tube forming device {A Device of Molding Rectangular Tube for Corrugated Pipe}

The present invention relates to an apparatus for forming a small quadrangular tube that can efficiently form a small square tube used as a material for a double wall smooth tube having an inner and outer surface smooth.

Forming apparatuses for molding various types of small pipes have been developed and utilized in the past, and one of them is disclosed in Korean Laid-Open Patent Publication No. 2001-68 (2001. 01. 05), "Sizing mechanism of synthetic resin tube. Has been published. The sizing mechanism of the resin tube is a device for sizing the resin tube extruded from the extruder to a predetermined shape and dimensions before the vacuum tank is inserted into the vacuum tank, and has a plurality of apertures in a constant arrangement on the circumferential surface and the portion where the apertures are formed The inner circumferential surface of the head portion, which is located in the vacuum tank and located outside the vacuum tank, has a sizing tube whose diameter decreases in the longitudinal direction, a fixing ring for fixing the head portion of the sizing tube to the vacuum tank, and is located in front of the head portion of the sizing tube. It consists of a guide ring which guides the synthetic resin tube to its head and decreases the diameter of the inner circumferential surface in the longitudinal direction, and an acrylic cover which is located on the outer circumferential surface of the contact portion of the fixing ring and the guide ring and forms an inlet and an outlet on the circumferential surface.

According to such a prior application name, a water film is formed on the outer surface of the synthetic tube which enters the sizing pipe from the die of the extruder as water passed through the inlet and outlet of the acrylic cover mounted on the outer surface of the space between the guide ring and the head. Therefore, the resin tube was stably guided to the sizing tube to remove the cause of defects, and the outer surface of the resin tube was uniformly cooled to have an effect of improving product quality.

However, in the sizing mechanism of the synthetic resin tube of such a name, the acrylic cover mounted on the outer surface of the space between the guide ring and the head portion passes the water through only one inlet and outlet, respectively, to cool the synthetic tube. In view of this, not only is it insufficient to actually pass a large amount of water per unit time, but also the time required for the incoming water to come into contact with the resin tube becomes very short, thereby cooling the resin tube to the required hardness. There was a shortcoming.

Therefore, in order to cool the synthetic resin tube with the required hardness, it is necessary to pass slowly toward the sizing tube, so that the overall production rate of the synthetic resin tube is lowered, and thus the product productivity is greatly reduced. In order to improve productivity by quickly entering and passing the plastic tube toward the sizing tube in consideration of such a problem, the resin tube cannot be cured to the required hardness because the time for contact with new water is short. It is accompanied by problems such as an increase in the defective rate of the product and a decrease in quality.

The object of the present invention is to configure the outer surface of the small circular tube extruded and supplied from the die to be cured quickly to the required hardness and guide it to the sizing side, so that it is possible to obtain a more precise and uniformly shaped small square tube. The present invention provides a molding apparatus for a small square tube that maximizes productivity by improving the efficiency of molding the small square tube.

1 is a partially cutaway front view showing a molding apparatus of the present invention small square tube.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross-sectional view taken along the line B-B of FIG.

Figure 4a, Figure 4b shows the working state of the present invention, showing a state in which the small circular tube is molded into a small square tube in the sizing portion

Figure 5 is a perspective view showing a small square tube molded as a molding apparatus of the present invention small square tube

<Description of the symbols for the main parts of the drawings>

10: die 11: molten resin passage 12: outer mold

13: internal mold 14: auxiliary molten resin passage 15: molten resin nozzle

20: vacuum box 21: frame 21a: inlet

21b: outlet 22: vacuum pump 30: sizing

31: sizing passage 32: suction hole 33: unit disc

33a: passage hole 33b: assembly hole 34: fastening bolt

35: washer 40: guide cooling means 40a: fastening hole

41: guide passage 42: cooling water inlet hole 43: cooling water discharge hole

44: cooling water passage space 45: stepped portion

The die 10 has an arc-shaped molten resin passage 11 inside the present invention and continuously extrudes a small circular tube 3, and is disposed in front of the die 10 to maintain a vacuum state therein. A sizing 30 having a vacuum box 20 installed in the vacuum box 20, a sizing passage 31 having a quadrangular sizing passage 31 formed in the vacuum box 20, and suction holes 32 are formed at predetermined intervals; It is arranged in the front side inlet of the 20 and has a guide passage 41 in communication with the sizing passage 31, and consists of the guide cooling means 40 formed to pass the cooling water in the conventional and technical concept Do it together.

However, in the molding apparatus of the small square tube of the present invention, the guide cooling means (40) is a coolant that is radially drilled so as to face each other with one set around the circular guide passage (41) formed at the center thereof. Inlet holes 42 and cooling water discharge holes 43 are formed, and the cooling water inlet holes 42 and the cooling water discharge holes 43 communicate with each other inside the guide passage 41, and the coolant discharge holes 43 communicate with each other. It is characterized by the technical configuration that the cooling water oil passage space 44 formed by the rear center portion is opened to a large diameter.

In other words, the molding apparatus of the small square tube of the present invention, as shown in Figure 1, the guide passage 41 formed at the center of the front side inlet of the vacuum box 20 between the die 10 and the sizing 30, The guide has a cooling water inlet hole 42 and the cooling water discharge hole (43) radially circumferentially installed to secure the cooling water oil passage space 44 in communication with them, the die ( 10) Supply a large amount of cooling water toward the outer surface of the small circular tube 3 extruded and supplied to the outer surface of the small circular tube 3 so as to maximize the time for contacting the large amount of cooling water. It is configured to guide the cooling to the sizing 30 side efficiently as. Therefore, even if the present invention rapidly enters and passes the small circular tube 3 extruded and supplied from the die 10, the outer surface of the small circular tube 3 has an opportunity to sufficiently contact with a large amount of cooling water. In addition, the small round tube 3 entering the sizing 30 can be molded into a small square tube 4 having a more precise and uniform quadrilateral cross section, and the production of the small square tube 4 is also possible. It has the advantage of increasing the speed to increase the overall output.

Hereinafter, the technical details of the present invention through the specific embodiments shown in the accompanying drawings in detail as follows.

The die 10 is a component for extruding and supplying a small circular tube 3 obtained by dissolving synthetic resin particles in a gel state.

The die 10 is assembled to the inner mold 13 at regular intervals inside the cylindrical outer mold 12, the molten resin passage 11 between the outer mold 12 and the inner mold 13 To form. This die 10 is continuously supplied from the molten resin passage 11 formed between the outer mold 12 and the inner mold 13 to extrude and supply a small circular tube 3 having a cylindrical cross-sectional shape as a gel state. Will be.

Here, the die 10 is installed so that the separate molten resin nozzle 15 is connected to the outside by being drilled vertically toward the molten resin passage 11 at a predetermined position of the outer mold 12 as shown in FIG. Note that it may be by forming an auxiliary molten resin passage 14 to be. The secondary melt resin passage 14 is melted in a variety of colors supplied from a separate melt resin nozzle 15 to the outer surface of the small circular tube 3 which is extrusion molded through the melt resin passage 11 of the die 10. By coating the resin strip, the color strip 4a is formed on the outer surface of the small square tube 4 formed as shown in FIG. 5, which helps to obtain a synthetic resin double wall smooth tube having a color sense in appearance. do.

The vacuum box 20 is disposed in front of the die 10 to maintain the internal space in a vacuum state.

The vacuum box 20 has a shape of a rectangular parallelepiped and has an inner space in which airtightness is maintained, and is formed by forming the inlet 21a and the outlet 21b on the front and rear surfaces, respectively, and the frame 21. It is configured as a vacuum pump 22 which is installed to discharge the air of the inner space of the frame portion to the upper predetermined position of the outside.

In addition, the vacuum box 20 stores a predetermined amount of coolant in the inner space of the frame part 21, and is formed through the sizing 30 installed in the vacuum box 20 through a small square tube 4. It is desirable to allow the cooling to be quickly.

The vacuum box 20 accommodates a certain amount of cooling water in the internal space, and maintains the internal space in a vacuum state with the vacuum pump 22, so that the small round tube 3 is the sizing passage 31 of the sizing 30. ), So that it can be transformed into a small quadrangular tube (4) of quadrilateral cross section and cooled.

Sizing 30 is a component that is installed in the inner space of the vacuum box 20 to form a small square tube (4).

This sizing 30 is made of a disc body as shown in Fig. 1, and has a constant space between the unit discs 33 having a plurality of assembly holes 33b which are formed so that the passage holes 33a are formed at the center and are located in all directions. Assembling so as to secure the suction holes 32 at intervals, so that the passage hole 33a of each of the unit discs 33 forms one sizing passage 31 communicating with the suction hole 32 at a right angle.

The unit discs 33 are firmly assembled as fastening bolts 34 fitted through the respective assembly holes 33b. At this time, the washer 35 is disposed between the unit discs 33 so as to be in contact with the assembly hole of the unit disc, and then assembled as a fastening bolt 34 through which the washer 35 is disposed. The suction holes 32 are formed at intervals of the thickness.

As shown in FIGS. 4A and 4B, the sizing 30 has a tip end portion of the sizing passage 31 and an opening 21a of the vacuum box 20 and a rear end portion of the sizing passage 31. It is installed horizontally so as to communicate with the outlet 21b of the 20, respectively, so that the vacuum suction input artificially formed in the vacuum box 20 acts on the small circular tube 3 passing through the suction hole 32, The small round tube is brought into close contact with the sizing passage 31 to be molded into a small square tube 4.

The guide cooling means 40 is a component for cooling the outer surface and guiding it to the sizing 30 while maintaining the original cylindrical cross section 3 of the small circular pipe 3 extruded and supplied from the die 10.

The guide cooling means 40 is a disk having a constant circumferential size and cross-sectional thickness, as shown in FIG. 3, and is radially opposed to each other by forming a plurality of pieces around a circular guide passage 41 formed in the center thereof. Cooling water inflow holes 42 and the cooling water discharge holes 43 are formed to be formed, the cooling water inflow holes 42 and the cooling water discharge holes 43 communicate with the guide passage 41 and the guide passage. It is important to secure the cooling water oil passage 44 formed by opening the rear central portion with a larger diameter (41). The reason for this is that a large amount of cooling water is supplied toward the outer surface of the small circular tube 3 extruded and supplied from the die 10, and a large amount of cooling water supplied with the outer surface of the small circular tube 3 and a sufficient time. It is to make it possible to make it contact for a while, so that the small round tube 3 can be efficiently cooled as required hardness.

In addition, the guide cooling means 40 forms a plurality of fastening holes 40a in all directions so as to correspond to the assembly holes 33b formed in the unit disc 33 of the sizing 30. As a fastening bolt 34 penetrating through the unit disc 33 of the vacuum box 20 to be fixed to be installed.

In addition, the inner end of the guide passage 41 of the guide cooling means 40 may be formed with a stepped portion 45 which is bent toward the cooling water oil passage 44. This is because the coolant inflow holes 42 and the coolant discharge holes 43 communicating with the coolant oil passage space 44 are bent around the guide passage 41, so that the coolant passes through the guide passage 41. This delay helps to effectively cool the outer surface of the small round tube 3.

Here, the coolant inlet holes 42 of the guide cooling means 40 are piped to be connected to the coolant pump 50 through the water supply pipe 51, and the coolant discharge holes 43 are connected to the coolant tank through the drain pipe 61. 60) to be connected so that the cooling water can be circulated.

As described above, the present invention provides an opportunity for the outer surface of the small circular tube to sufficiently contact with a large amount of cooling water even if it passes through the small circular tube that is extruded and supplied from the die to enter the sizing. It is possible to form a small round tube to be a more precise and uniform four-sided small square tube, and at the same time have a useful effect, such as to increase the overall production by increasing the production speed of the small square tube.

Claims (5)

A die 10 having an arc-shaped melt resin passage 11 therein for continuously extruding the small circular tube 3, and disposed in front of the die 10 to be installed to maintain a vacuum inside the die 10. A sizing 30 having a vacuum box 20, a quadrangular sizing passage 31 formed in the vacuum box 20 and having suction holes 32 formed at predetermined intervals, and the vacuum box 20. In the configuration of the guide cooling means 40 is disposed at the front side inlet of the guide passage 41 is in communication with the sizing passage 31 and is formed to pass the cooling water, The guide cooling means 40 is a plurality of cool water inlet holes (42) and the coolant discharge hole (43) radially drilled so as to face each other in a set around a circular guide passage 41 of the arc formed in the center portion Cooling water inlet space formed by forming a, and the cooling water inlet holes 42 and the cooling water discharge holes 43 are communicated inside the guide passage 41 and the rear center portion is opened to a diameter larger than the guide passage 41 ( 44) forming apparatus of small square tube, characterized in that to ensure. The auxiliary melt according to claim 1, wherein the die 10 is vertically drilled toward the molten resin passage 11 at a predetermined position of the external mold 12 so that a separate molten resin nozzle 15 is connected to the outside. Molding apparatus for a small square tube, characterized in that to form a resin passage (14). According to claim 1, wherein the sizing 30 is made of a disc body, the passage hole (33a) is formed in the center and is constant between the unit disc 33 having several assembling holes (33b) to be drilled to be located in all directions Assembling so as to secure the suction holes 32 at intervals, so that the passage hole 33a of each of the unit discs 33 forms a sizing passage 31 communicating with the suction hole 32 at a right angle. Small square tube forming apparatus. delete The method according to claim 1, wherein the inner end of the guide passage 41 of the guide cooling means 40 is formed of a stepped portion 45 which is bent toward the cooling water oil passage space 44, characterized in that Molding apparatus.