KR20230093851A - Manufacturing Apparatus for Unplasticized PVC Pipe - Google Patents

Abstract

The present invention relates to a rigid PVC pipe manufacturing apparatus, and more particularly, to a rigid PVC pipe manufacturing apparatus including a sizing mold having a handle and a vacuum cooling apparatus having a rotating roller.
According to the present invention, since the inner and outer diameters of the mold of the sizing device are adjusted with the handle instead of the bolt, precise diameter control can be easily performed.
In addition, the present invention is provided with a rotating roller and a height adjusting unit in the vacuum cooling device so that the PVC pipe can be withdrawn simultaneously with cooling inside the vacuum cooling device, and the vacuum is at the same height as the PVC pipe changed according to the control of the inner and outer diameters of the mold. There is an effect of reducing defects by setting the cooling device.

Description

Rigid PVC pipe manufacturing apparatus {Manufacturing Apparatus for Unplasticized PVC Pipe}

The present invention relates to a rigid PVC pipe manufacturing apparatus, and more particularly, to a rigid PVC pipe manufacturing apparatus including a sizing mold having a handle and a vacuum cooling apparatus having a rotating roller.

PVC is a colorless, transparent and strong material, but when plasticizers are added, it becomes soft and soft. The product made soft and soft by adding plasticizer is called soft PVC, and the product without plasticizer is called hard PVC. Rigid PVC is used to make rigid products such as plumbing materials, window frames, and windows by adding no plasticizer at all or by mixing less than about 10% plasticizer. Rigid PVC pipe is manufactured by extrusion molding while heating at about 200 ~ 240 ℃ by adding a heat stabilizer, colorant, lubricant, etc. to vinyl chloride powder, which is a polymer, and it has excellent properties that cannot be seen in metal pipes. has excellent corrosion resistance (acid resistance, alkali resistance), chemical resistance, oil resistance, lightness, toughness, low frictional resistance of the pipe, excellent electrical insulation, low risk of fire, and does not freeze quickly like a metal pipe, It is easy to process piping, is inexpensive, requires less construction cost, has a greater sound insulation effect than metal pipes, and can produce products in various colors.

The PVC pipe extrusion process includes 1) preparing raw materials and additives for the production process, 2) mixing the prepared raw materials, 3) extruding the mixed raw materials with a screw extruder, 4) extruding with a sizing device, It is divided into 5) cooling by vacuum device, 6) cutting the cooled PVC pipe, and 7) inspecting and packaging the finished product.

PVC pipes are made by mixing polyvinyl chloride as the main raw material and other additives. Supplementary materials of PVC synthetic resin include stabilizers, pigments, lubricants, auxiliary agents, and fillers. Sub-materials used in PVC compounds have been developed to have properties required for PVC pipes. In the process of PVC pipe extrusion, the PVC compound is injected into an extruder with a screw. The material is conveyed to the tip of the extruder by pumping by means of a screw. Conveying the material through the extruder and controlling the temperature and pressure converts it from a dry powder into a viscous plastic material. This process must be carefully and precisely controlled to give the final product the coffins with the required properties. After the plasticating process is complete and the volatiles are removed from the melted plastic, the plastic is extruded into a pipe-shaped mold under a pressure of 2,000 to 5,000 psi. Inside the extrusion mold, the hot plastic material is continuously formed into a cylindrical shape. The temperature of the material as it exits the extruder mold through the ejector orifice is about 200 °C, it is flexible, it is made into the final product and then cooled to a solid state. When the manufacturing process is completed, the final pipe is moved to a place where the quality of the product is inspected and the quality assurance is inspected.

In the extrusion molding stage of the PVC pipe production line, it was difficult to maintain a constant thickness because the head of the mold from which the molten PVC raw material was pushed out controlled the thickness by means of a bolt. In addition, many defects occurred because the vacuum device for cooling the extruded PVC pipe was not perfect, and more research is needed on this.

Republic of Korea Patent Registration No. 10-2009006 Republic of Korea Patent Registration No. 10-2212545 Republic of Korea Patent Publication No. 10-2008-0101589 Republic of Korea Patent Publication No. 10-2012-0114886

The present invention is to solve the above problems, and an object of the present invention is to provide a PVC pipe manufacturing apparatus having a handle portion so that the inner and outer diameters of the sizing mold can be easily adjusted.

In addition, another object of the present invention is to provide a rigid PVC pipe manufacturing apparatus having a rotating roller in a vacuum cooling device so that the PVC pipe can be easily withdrawn.

In order to achieve the above object, the rigid PVC pipe manufacturing apparatus of the present invention is characterized in that it includes a sizing mold having an adjustable inner diameter and an outer diameter, and a vacuum cooling device having a rotating roller therein.

Rigid PVC pipe manufacturing apparatus of the present invention includes an extrusion molding apparatus; a sizing mold for extruding the raw material extruded from the extrusion molding device; and a vacuum cooling device for cooling the extruded raw material in a vacuum, wherein the sizing mold has an inner diameter portion and an outer diameter portion that can be adjusted in diameter, and the vacuum cooling device includes a rotating roller therein.

Here, the sizing mold is located at one end of the inner diameter part and the outer diameter part, and the gear part provided with a gear to adjust the diameter of the inner diameter part and the outer diameter part; a length adjustment unit positioned at the other ends of the inner and outer diameter portions to adjust the diameters of the inner and outer diameter portions in combination with the gear portion; an inner disk connected to the upper end of the gear unit to transmit external rotational force; an outer disc that is located on top of the inner disc and is fixed and supported when an external rotational force is transmitted; a connecting portion connecting the inner disc and the outer disc; It is preferable to include; and a handle part connected to the outer disk so that the operator manually creates a rotational force to adjust the diameters of the inner and outer diameters.

In addition, here, the vacuum cooling device, a vacuum device for cooling the molding extruded PVC pipe; a support part for supporting the rotating roller; And a height adjusting unit operating in a suspension method or a gear method capable of adjusting the height of the rotating roller and the support portion at a lower portion of the support portion, and a side surface of the handle portion is rotated to detect the rotation number and rotation angle of the handle portion. It is preferable to have a measuring unit, and the height adjusting unit is interlocked with the rotation measuring unit to adjust the heights of the rotating roller and the support unit.

As described above, since the inner and outer diameters of the mold of the sizing device are adjusted by the handle part instead of the bolt, the precise diameter control can be easily performed.

In addition, the present invention is provided with a rotating roller and a height adjusting unit in the vacuum cooling device, so that the PVC pipe can be withdrawn simultaneously with cooling inside the vacuum cooling device, and the vacuum is at the same height as the PVC pipe changed according to the control of the inner and outer diameters of the mold. There is an effect of reducing defects by setting the cooling device.

1 is a schematic diagram of a conventional PVC pipe manufacturing apparatus.
2 is a cross-sectional view of a sizing mold according to an embodiment of the present invention.
3 is a schematic view of a handle part of a sizing mold according to an embodiment of the present invention.
4 is a schematic diagram of a vacuum cooling device according to an embodiment of the present invention.

In the drawings shown below, the same reference numerals denote the same components, and the size of each component in the drawings may be exaggerated for clarity and convenience of description. Meanwhile, the embodiments described below are merely illustrative, and various modifications are possible from these embodiments. In the following, terms are used only for the purpose of distinguishing one component from another. Singular expressions include plural expressions unless the context clearly dictates otherwise. In addition, when a certain component is said to "include", this means that it may further include other components without excluding other components unless otherwise stated. In addition, terms such as '... unit' described in the specification mean a unit that processes at least one function or operation.

Hereinafter, the configuration of the rigid PVC pipe manufacturing apparatus of the present invention will be described with reference to the drawings. 1 is a schematic diagram of a conventional PVC pipe manufacturing apparatus, FIG. 2 is a cross-sectional view of a sizing mold according to an embodiment of the present invention, and FIG. 3 is a schematic view of a handle portion of a sizing mold according to an embodiment of the present invention. And, Figure 4 is a schematic diagram of a vacuum cooling device according to an embodiment of the present invention. 2 to 4, the rigid PVC manufacturing apparatus of the present invention may include a sizing mold 200 and a vacuum cooling apparatus 300.

The sizing mold 200 of the present invention makes the high-temperature hard PVC dough kneaded in the extrusion device 100 and delivered by a screw into a PVC pipe. Specifically, a PVC resin, a composite stabilizer, a filler, an impact-resistant reinforcing agent, etc. may be mixed in a blender located in the extrusion device 100. The composite stabilizer may include one or two or more selected from zinc stearate, calcium stearate, and magnesium stearate. can be used in combination. The mixed raw material is injected into the hopper at the top of the extruder, and can be extruded while being transported at a speed of 1,700 to 1,800 rpm by a screw inside the extruder maintained at 180 to 250 ° C. The pressure inside the extruder is maintained at 2,000 to 5,000 psi and converts the raw material transported to the screw into a viscous plastic material. The adhesive plastic material is extruded while passing through the sizing mold 200 . 2 to 3, the sizing mold 200 includes an inner diameter part 210, an outer diameter part 220, a gear part 230, a length adjusting part 240, an inner disc 250, and a connecting part 260. , It may include an outer disc 270 and a handle portion 280.

The inner diameter part 210 of the present invention is a mold member for forming the inner diameter of the PVC pipe, and the outer diameter part 220 is a mold member for forming the outer diameter of the PVC pipe. Therefore, the difference between the radius of the outer diameter portion 220 and the radius of the inner diameter portion 210 becomes the thickness of the PVC pipe. That is, it can be extruded into a tubular shape by passing through a space between the inner diameter portion 210 and the outer diameter portion 220 .

The gear unit 230 of the present invention is located at one end of the inner diameter part 210 and the outer diameter part 220, and a gear may be provided to adjust the diameter of the inner diameter part and the outer diameter part. In addition, the length adjustment unit 240 of the present invention is located at the other end of the inner diameter portion 210 and the outer diameter portion 220, in combination with the gear portion 230, the diameter of the inner diameter portion 210 and the outer diameter portion 220 This can be regulated. As shown in FIG. 2, the gear unit 230 according to an embodiment of the present invention may include a pinion gear, and the length adjusting unit 240 according to an embodiment of the present invention may include a rack ( rack) may be equipped with gears. That is, the rotational motion of the pinion gear can be converted into linear reciprocating motion through the rack gear. The configuration of the gear unit 230 and the length adjustment unit 240 of the present invention is not limited to rack and pinion gears, and any means capable of converting rotational motion into linear reciprocating motion by physical action may be used.

The inner disc 250 of the present invention is connected to the upper end of the gear unit 230 so that external rotational force is transmitted, and the outer disc 270 is located on top of the inner disc 250 and external rotational force is transmitted. It is fixed and supported, and the connection part 260 connects the inner disc 250 and the outer disc 270. Here, the connecting portion 260 may be detachably fastened to the inner disk 250 . Therefore, after the diameters of the inner and outer diameters are adjusted, the connection part 260 is separated from the inner disk 250 so as not to make unnecessary contact with the handle part 280 so that the diameters of the inner and outer diameters do not fluctuate. do.

A handle part 280 is located at the top of the sizing mold 200, and the handle part 280 is connected to the outer disc 270 so that a worker manually creates a rotational force to separate the inner diameter part 210 and the outer diameter part 220. Allows you to adjust the diameter. In order to create a rotational motion, when the operator rotates the handle part 280 by the specified number of rotations, this rotational motion is transmitted to the inner disc 250 through the connecting portion 260, rotates the gear of the gear unit 230, and length adjustment unit As the length of 240 is adjusted, the diameters of the inner diameter portion 210 and the outer diameter portion 220 are adjusted. Here, the outer disc 270 is fixed without rotating, unlike the inner disc 250 and the connecting portion 260, so that it serves as a central point. For example, the inside of the outer disk 270 is provided with an angle calculation unit for calculating a conversion value of the diameters of the inner diameter portion 210 and the outer diameter portion 220 according to the rotation angle of the handle portion 280, An analog or digital display capable of measuring the rotation angle of the handle unit 280 is provided so that the operator can check the rotation angle of the handle unit 280 displayed on the display and the diameter transmitted from the angle calculation unit. In addition, a scale indicating an angle can be made on the upper surface of the outer disk 270 so that the angle at which the handle part rotates can be accurately confirmed. Whereas the prior art used to adjust the head of the mold with bolts, in the present invention, the handle part 280 is provided so that the head of the mold can be easily and accurately adjusted.

Meanwhile, in the present invention, it is applicable without using the outer disc 270. For example, an inner disc 250 connected to the upper end of the gear unit 230; A connecting portion 260 connected to the inner disc 250; A handle part 280 rotatably fastened to the upper part of the connection part 260; may be provided. In addition, the connecting portion 260 may be detachably fastened to the inner disk 250 .

The vacuum cooling device 300 of the present invention is a device for cooling an extruded PVC pipe, while the PVC dough passing through the sizing mold 200 maintains the shape of the PVC pipe and passes through the vacuum cooling device 300 to be cooled. The PVC pipe is complete. Referring to FIG. 4 , the vacuum cooling device 300 may include a vacuum unit 310, a rotating roller 320, a support unit 330, and a height adjustment unit 340.

The vacuum device unit 310 of the present invention creates a vacuum state so that the PVC pipe inside the vacuum cooling device 300 can be cooled. The vacuum device unit 310 includes a vacuum pump 311 and a vacuum line unit ( 312) may be included. The vacuum pump 311 extracts air from the vacuum cooling device 300 connected to the vacuum line unit 312 to maintain a vacuum state. The vacuum pump 311 is a means for forcibly transporting fluid that forcibly sucks in and discharges fluid by pumping action by vacuum pressure. It consists of an impeller (not shown) receiving power by a motor to the inside of. Cooling by vacuum can remove air bubbles generated during the extrusion of the PVC pipe. In addition, it is possible to improve the physical properties of the PVC pipe by minimizing the residual stress by uniform cooling by vacuum, and to improve the thermal stability of the molten PVC pipe by improving the cooling efficiency, and to minimize the amount of thermal stabilizer used. The vacuum cooling device 300 is provided with a viewing window (not shown) and a pressure gauge (not shown) through which the vacuum state can be checked, so that it can be checked whether the vacuum state is properly maintained.

The vacuum cooling device 300 of the present invention has a rotating roller 320 therein so that the extruded PVC pipe can be drawn out by the rotational force of the rotating roller 320. The rotating roller 320 according to an embodiment of the present invention may be a roller conveyor. Here, the roller conveyor refers to a conveyor of a method of conveying an object using a plurality of freely rotatable rollers. The extruded PVC pipe is drawn out through the rotating roller 320, and the drawing speed can be adjusted by adjusting the speed of the rotating roller 320. The present invention has the advantage of not having to install a separate take-out device by providing the rotary roller 320 inside the vacuum cooling device 300. The support part 330 of the present invention supports the rotary roller 320, and the rotation shaft of the rotary roller 320 is located in the support part.

The height adjusting unit 340 of the present invention is located below the support unit 330 and adjusts the heights of the rotation roller 320 and the support unit 330 . When the inner and outer diameters of the PVC pipe are changed by the sizing mold 200, the vacuum cooling device 300 connected to the sizing mold 200 adjusts the height of the rotating roller 320 and the support part 330 according to the size of the PVC pipe. It can be changed to maintain closeness between the vacuum cooling device 300 and the sizing mold 200. The height adjusting unit 340 can be adjusted in height using various mechanical methods such as a suspension method or a gear method. The height of the height adjusting unit 340 of the present invention is adjusted in consideration of the diameters adjusted in connection with the adjusted diameters of the inner diameter part 210 and the outer diameter part 220, and the heights of the rotating roller 320 and the support part 330 should be regulated. In addition, a separate sensor may be installed to detect the number of rotations of the handle part 280 so that the height of the height adjusting unit 340 is adjusted by the number of rotations. For example, a rotation measurement unit for detecting the number of rotations and rotation angle of the handle unit 280 is provided on a side surface of the handle unit 280, and the height adjusting unit 340 is interlocked with the rotation measurement unit to determine the rotational speed of the handle unit 280. Since the height of the rotating roller and the support can be adjusted, it is possible to transport the PVC pipe at an accurate position within the vacuum cooling device 300.

The present invention is not limited to the above embodiments, but can be manufactured in a variety of different forms, and those skilled in the art to which the present invention pertains may take other specific forms without changing the technical spirit or essential features of the present invention. It will be understood that it can be implemented as. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting.

100: extrusion device
200: sizing mold
210: inner diameter
220: outer diameter
230: gear part
240: length control unit
250: inner disc
260: connection part
270: outer disc
280: handle part
300: vacuum cooling device
310: vacuum unit
311: vacuum pump
312: vacuum line unit
320: rotating roller
330: support
340: height control unit
400: withdrawal device

Claims (3)

extrusion molding equipment;
a sizing mold for extruding the raw material extruded from the extrusion molding device;
A rigid PVC pipe manufacturing apparatus comprising a; vacuum cooling device for cooling the extruded raw material in a vacuum,
The sizing mold has an inner diameter and an outer diameter that can be adjusted in diameter, and the vacuum cooling device has a rotating roller inside. The method of claim 1,
The sizing mold,
a gear unit located at one end of the inner and outer diameters and provided with gears to adjust the diameters of the inner and outer diameters;
a length adjustment unit positioned at the other ends of the inner and outer diameter portions to adjust the diameters of the inner and outer diameter portions in combination with the gear unit;
an inner disc connected to an upper end of the gear unit;
a connecting portion connected to the inner disc;
an outer disk located above the connecting portion;
Rigid PVC pipe manufacturing apparatus comprising a; handle portion connected to the outer disc and rotatably fastened. The method of claim 2,
The vacuum cooling device,
A vacuum device for cooling the extruded PVC pipe;
a support part for supporting the rotating roller; and
A height adjusting unit operating in a suspension method or a gear method capable of adjusting the height of the rotating roller and the support portion is provided at the lower part of the support portion; and
A rotation measuring unit for detecting the number of rotations and rotation angle of the handle unit is provided on the side of the handle unit, and the height adjusting unit is interlocked with the rotation measurement unit to adjust the height of the rotating roller and the support unit. Device.

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