KR20040075418A - Apparatus of producing a twisted plastic pipe - Google Patents

Abstract

PURPOSE: A device for manufacturing a twisted plastic pipe is provided to improve productivity and minimize reject rate by continuously twisting the plastic pipe. CONSTITUTION: A device for manufacturing a twisted plastic pipe is composed of a supply unit(20) for supplying plastic pipes, a heating unit(30) for heating the plastic pipes, a twisting unit for twisting the plastic pipes, a cooling unit(50) for cooling the twisted plastic pipes, and a discharge unit(60) for discharging the cooled plastic pipes. The supply unit includes trays(21,22), a plurality of feed rollers(24a,24b) disposed in the trays, and a deposit box(23) disposed between the trays.

Description

Apparatus of producing a twisted plastic pipe

The present invention relates to an apparatus for forming plastic pipes, and more particularly, by adopting torsion processing as a continuous post process after the extrusion process of plastic pipe products, it is possible to increase the design freedom of the extruded square plastic pipes and to improve productivity. A torsional molding apparatus for plastic pipes that can be improved.

In general, plastic pipes have been widely used in crude oil transportation, natural gas transportation, watering, sewage treatment, fire water supply, chemical plant equipment, etc., and are recently gaining attention as building materials. Such plastic pipes applicable to many fields require various characteristics such as corrosion resistance, chemical resistance, low thermal conductivity, processability, light weight, and variability of application methods, depending on the intended use.

Thermoplastic pipes are made of plastic pipes by extrusion molding and cut to the desired size depending on the installation location. As a material for the thermoplastic pipe, various materials such as polyvinyl chloride (PVC), polyethylene (PE), or acrylonitrile-butadiene-styrene (ABS) resin are used.

Various devices have been developed for easily bending or molding plastic pipes of such materials. Typically, such devices include a means for heating the plastic pipe to a predetermined molding temperature, which is cooled after the molding is finished to the desired shape.

In the apparatus for performing these standardized work steps, the plastic pipe produced through the extrusion cannot design a special design in the longitudinal direction (= exit direction after molding) and in the vertical or horizontal direction during the extrusion process. There is this. Therefore, not only can not meet the needs of consumers who want to release a variety of products, but also from the point of view of the producers are difficult to expand the customer and market development.

As one of efforts to solve this problem, conventionally, a method of assembling in a desired form using an injection product and an extruded product has been used. However, this method has drawbacks that are cumbersome, complicated, and expensive to manufacture.

The present invention has been made to solve the conventional problems as described above, the object of the present invention is to perform a torsional processing in order to twist the plastic pipe produced by extrusion molding to a constant size, release by The present invention provides a torsional molding apparatus for plastic pipes that can improve the design of an extruded product and improve productivity.

1 is a view schematically showing the overall configuration of a torsional molding apparatus of a plastic pipe according to a preferred embodiment of the present invention, and

2 is a view schematically showing the configuration of the torsion processing unit shown in FIG.

<Explanation of symbols for main parts of drawing>

10: torsional molding apparatus 20: supply unit

21,22 tray 23 deposit box

24a, 24b: feed roller 25a, 25b: sensor

26a, 26b: switchgear 30: heating unit

31: rotating jig 32: conveyor

34: ceramic heater (= hot air blower) 36: composite belt

38: heating furnace 40: torsion processing unit

42: jig-twister 44: distance sensor

46: auxiliary jig 50: cooling unit

60: discharge part

In order to achieve the above object, the present invention,

Torsional forming apparatus of plastic pipe,

A supply unit for supplying a plastic pipe produced through extrusion molding;

A heating unit for heating the plastic pipe product transferred from the supply unit to a predetermined temperature range;

A torsion processing unit for twisting the plastic pipe product plasticized by heating in the heating unit to a predetermined size;

A cooling section for cooling the twisted plastic pipe product while passing through the twist processing section; And

It provides a torsional molding apparatus for plastic pipes, characterized in that it comprises an outlet for shipping the finished product.

In order to prevent the central portion of the plastic pipe product from sagging by the heating made in the heating furnace, a composite belt in which a metal plate having a predetermined width is inserted is disposed at the center of the heating furnace horizontally with the processing direction.

The torsion processing unit includes a plurality of jig-twisters arranged to rotate in different directions, and adjacent to the jig-twisters to pick up the torsionally processed products by the jig-twist to be transported to a post-treatment process. It has an auxiliary jig arranged.

As described above, the torsional molding apparatus for plastic pipes according to the present invention adopts a torsion processing process as a continuous post-treatment process for extruded plastic pipe products, thereby increasing the degree of freedom of design of rectangular plastic pipes to produce various products. It can manufacture. In addition, the failure rate of the product can be minimized.

Hereinafter, a torsional molding apparatus of a plastic pipe according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 schematically shows the overall configuration of a torsional molding apparatus according to a preferred embodiment of the present invention.

Referring to FIG. 1, the torsional molding apparatus 10 of a plastic pipe according to a preferred embodiment of the present invention mainly includes a supply unit 20, a heating unit 30, a torsion processing unit 40, a cooling unit 50, and a discharge unit. The unit 60 is provided.

First, the supply unit 20 is for cutting and supplying a plastic pipe produced by extrusion molding by a predetermined length prior to torsional molding, and a plurality of fastening units disposed in the trays 21 and 22 and the trays 21 and 22. The transfer rollers 24a and 24b include a deposit box 23 disposed vertically between the upper tray 21 and the lower tray 22.

The deposit box 23 generally has a capacity to store about 10 to 20 plastic pipe products, and an upper opening 26a and a first opening for controlling the opening / closing operation thereof are formed at an upper end of the deposit box 23. The sensor 25a is arranged. If the plastic pipe manufactured by extrusion molding is cut to a predetermined size and then supplied to the first tray 21, the plastic pipe is opened by the rotating first roller 24a to open the upper end of the deposit box 23. A certain amount is put into the deposit box 23 through. At this time, the first sensor 25a controls the opening and closing operation of the upper opening and closing device 26 to adjust the amount of the plastic pipe introduced into the deposit box 23. Since the amount of plastic pipe introduced into the deposit box 23 is controlled by the amount of work and the speed of work, the position of the first sensor 25a is determined at the beginning of equipment setting in consideration of this.

Similarly, the lower opening and closing device 26b and the second sensor 25b for controlling the opening and closing operation thereof are disposed at the lower end of the deposit box 23. If the plastic pipe is sequentially introduced into the deposit box 23 through the upper end of the deposit box 23, the second sensor 25b sequentially feeds the plastic pipe product to the heating part 30 next to the supply part 20. By controlling the operation of the lower opening and closing device (26b) in order to transfer to the plastic pipe product in the deposit box 23 is separated from the lower end of the deposit box 23 one by one. Since the amount of plastic pipe that is separated from the lower end of the deposit box 23 is controlled by the amount of work and the speed of work, the position of the second sensor 25b is determined at the beginning of the equipment setting in consideration of this.

The plastic pipe product conveyed from the supply part 20 into the heating part 30 is mounted on the conveyor 32 of the heating part 30 by the rotary jig 31. That is, both ends of the plastic pipe product transferred into the heating part 30 are mounted by the rotary jig 31 and fixed by an air chuck (not shown).

In order to evenly heat the plastic pipe product in the furnace 38, the product itself should be rotated. In order to uniformly heat the plastic pipe product in the heating part 30, the rotary jig 31 receives the rotational power from the motor 33 disposed under the conveyor 32 through the driving belt 35. Will rotate.

At this time, the rotary jig 31 is moved by the conveyor 32 in a state mounted on the conveyor 32, a plurality of rotary jig 31 at regular intervals on the conveyor 32 for the continuous production. Is placed. The rotary jig 31 used here has a dual structure, and a rod bearing is mounted on the inner side so that the inner layer picks up the plastic pipe product and rotates in the same direction.

Meanwhile, the heating unit 30 includes a heating furnace 38 defined by walls of refractory ceramic material, and a plurality of ceramic heaters or hot air blowers 34 are disposed in the upper and lower portions of the heating furnace 38. The temperature in the furnace 38 is 250-350 ° C. by a thermostat (not shown) that operates on the basis of signals detected by a temperature sensor (not shown) disposed around the inner side of the furnace 38. Adjusted to range

In the center of the furnace 38, a composite belt 36 in which a metal plate having a width of about 10 cm is inserted is disposed horizontally with the processing direction. The composite belt 36 functions to prevent the central portion of the plastic pipe product from sagging by the heating made in the furnace 38.

Next, the torsion processing unit 40 is twisted to a certain size the plastic pipe product that has been heated after being heated to a predetermined temperature in the heating furnace 38 of the heating unit 30.

2, the structure of the torsion processing part 40 is shown schematically.

Referring to FIG. 2, a plurality of jig-twisters 42 are disposed in the torsion processing part 40. In the drawing, the portion “41” of the arrow remains fixed as the body portion, and the portion “43a, 43b, 43c” is a drive portion and the plastic pipe product is linearly reciprocated between the processing portion 40 and the cooling portion 50. It serves to transport.

Unlike the rotary jig 31 provided in the heating unit 30, the jig-twister 42 is configured in a cylindrical or cam manner so as to rotate in different directions. The jig-twister 42 is rotated in both directions by a rod bearing (not shown), the rotary plate (not shown) is divided into the top plate and the bottom plate and plastic pipe products through the operation of the air spring device (not shown) Is fixed on or detached from the rotating plate.

A distance sensor 44 is mounted between the heating furnace 38 of the heating unit 30 and the product introduction portion of the torsion processing unit 40 to check the moving position and operation of the jig-twister 42. The plastic pipe product passing through the heating part 30 is located by the distance sensor 44. In the torsion processing unit 40, the jig-twister 42 is rotated in different directions at a constant rotational speed while fixing the plastic pipe product. At this time, the rotational speed of the plastic pipe product is controlled by a pneumatic cylinder method, the product twisted by the jig-twister 42 is an auxiliary jig (adjacent jig disposed adjacent to the jig-twister 42 in the processing unit 40 ( 46).

The plastic pipe product picked up by the auxiliary jig 46 is cooled for several seconds in the first and second stages, and then transferred into the cooling unit 50 and finally sufficiently cooled, and then transferred to the leaving unit 60 to the final product. Shipped.

Hereinafter, the operation of the torsional molding apparatus 10 of the plastic pipe according to the preferred embodiment of the present invention configured as described above will be briefly described.

When the plastic pipe produced by extrusion molding is cut into a predetermined size and supplied to the first tray 21, a predetermined amount is sequentially input from the upper side of the deposit box 23 by the rotating first roller 24a. do. At this time, the input amount is controlled by the interlocking operation of the first sensor 25a and the upper opening and closing device 26a installed on the upper end of the deposit box 23.

The plastic pipe products introduced into the deposit box 23 are one by one from the lower end of the deposit box 23 by a linking operation of the second sensor 25b and the lower opening / closing device 26b installed at the lower end of the deposit box 23. Departure.

The plastic pipe product thus separated is transferred to the heating part 30 by the rotating roller 24b of the second tray 22. The plastic pipe product transferred to the heating unit 30 passes gradually through the heating furnace 38 in a state where both ends thereof are fixed by the rotary jig 31. As the plastic pipe product passes through the furnace 38, the plastic pipe product is plasticized by the operation of the ceramic heater or the hot air blower 34 inside the furnace 38, where it is heated to prevent the shape deformation and sag of the product. Passes over the composite belt 36 installed in the inner center of the furnace 38.

At this time, the rotary jig 31 is gradually rotated in the same direction for uniform heating of the rectangular product by the rotational force of the motor 33 transmitted through the drive belt 35. Rotation of the jig 31 is made in a state in which the product is fixed by a rod bearing mounted on the jig 31, the rotational speed of the plastic pipe product is controlled by the amount of air introduced.

On the other hand, the temperature inside the furnace 38 is somewhat different depending on the material used, because the thermal properties change depending on the glass transition temperature and melting temperature difference for each plastic material. Therefore, the plasticization temperature is set in consideration of the properties of the plastic pipe material. In addition, since the heating temperature is proportional to the thickness of the product and the speed passing through the heating furnace 38, the heating temperature is appropriately adjusted based on the relationship between the passing speed and the temperature.

The plastic pipe product passing through the heating furnace 30 is located by the length sensor 44, the product moved from the rotary jig 31 is transferred to the processing unit 40 to produce the torsionally processed product do.

The plastic pipe product conveyed to the processing part 40 is twisted by a jig-twist 42 which can rotate in different directions, unlike the rotary jig 31 of the heating part 30. That is, with both ends of the plastic pipe product fixed to a plurality of jig-twisters 42, the jig-twisters 42 rotate in different directions at a constant rotational speed and the processing unit 40 The body portion 41 of the fixed state is maintained and the driving portions 43a, 43b, 43c are twisted and twisted plastic pipe products by linear reciprocating motion between the processing portion 40 and the cooling portion 50. At this time, the rotational speed of the plastic pipe product is controlled by the pneumatic cylinder method.

The product twisted by the jig-twister 42 is conveyed to the auxiliary jig 46 disposed adjacent to the jig-twister 42 in the processing portion 40. The plastic pipe product picked up by the auxiliary jig 46 is cooled over the primary and secondary, and then transferred to the cooling unit 50 by the transfer device. The plastic pipe product, which is transferred into the cooling unit 50 and finally sufficiently cooled, is transferred to the leaving unit 60 and shipped as a final product.

As mentioned above, the torsional molding apparatus 10 of the plastic pipe according to the preferred embodiment of the present invention adopts a torsion processing process as a continuous post-treatment process for an extruded plastic pipe product, so that the square plastic pipe It is possible to manufacture various products by increasing design freedom. In addition, by adopting the post-processing method, it is possible to minimize the defect rate of the product and to improve the productivity, greatly expanding the application range as building materials.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Claims (6)

Torsional forming apparatus of plastic pipe, A supply unit 20 for supplying a plastic pipe produced through extrusion molding; A heating unit 30 for heating the plastic pipe product transferred from the supply unit 20 to a predetermined temperature range; A torsion processing unit 40 for twisting the plastic pipe product plasticized by heating in the heating unit 30 to a predetermined size; A cooling unit (50) for cooling the torsionally processed plastic pipe product while passing through the torsion processing unit (40); And Torsional molding apparatus of a plastic pipe, characterized in that it comprises a discharge part 60 for shipping the finished product. According to claim 1, The supply unit 20, the tray (21, 22), a plurality of conveying rollers (24a, 24b) arranged in the tray 21, 22, the tray 21, 22 between A torsional molding apparatus for plastic pipes, characterized in that it comprises a deposit box 23 arranged perpendicularly to it. The upper opening and closing device 26a and a first sensor 25a for controlling the opening and closing operation thereof are disposed at an upper end of the deposit box 23, and at a lower end of the deposit box 23. Torsional molding apparatus of a plastic pipe, characterized in that the lower opening and closing device (26b) and the second sensor (25b) for controlling the opening and closing operation thereof. The rotating jig of claim 1, wherein the heating part 30 includes a conveyor 32 and a rotary jig for mounting the plastic pipe product transferred from the supply part 20 into the heating part 30 on the conveyor 32. 31, the inner upper and lower torsional molding apparatus of a plastic pipe, characterized in that it comprises a heating furnace 38 is arranged a plurality of ceramic heaters or hot air heaters (34). 5. A composite belt according to claim 4, wherein a metal plate having a predetermined width is inserted in the center of the furnace (38) to prevent sagging of the central portion of the plastic pipe product by the heating in the furnace (38). Torsional molding apparatus of a plastic pipe, characterized in that 36 is disposed horizontally and the processing direction. 6. The torsion processing part 40 according to claim 5, wherein the torsion processing part 40 includes a plurality of jig-twisters 42 arranged to rotate in different directions and a product twisted by the jig-twister 42. An auxiliary jig 46 disposed adjacent to the jig-twist 42 to be picked up for transfer to a treatment process, and between the furnace 38 and the product introduction of the torsion processing section 40; Torsional molding apparatus of plastic pipes, characterized in that the distance sensor 44 for confirming the movement position and operation of the jig-twister (42) is mounted.