FR2462992A1 - METHOD FOR OBTAINING DROP WATER PIPES - Google Patents

Abstract

THE INVENTION RELATES TO A PROCESS FOR OBTAINING DROP-IRRIGATION PIPES, THESE PIPES BEING MANUFACTURED BY MEANS OF AN EXTRUDING MACHINE WHICH INCLUDES AN ANGULAR HEAD. ACCORDING TO THE INVENTION, THE ANGULAR HEAD IS SUFFICIENTLY SIZED TO ALLOW TO RECEIVE A CYLINDRICAL AND HOLLOW BODY, CONSTRUCTED IN AN INSULATING AND ANTI-CALORIE MATERIAL, HAVING THE POSSIBILITY OF MOVING AXIALLY ALONG THE EXTRUSION HEAD; INSIDE THE CYLINDRICAL BODY ARE ADVANTAGEOUSLY GUIDED THE ELEMENTS CONSTITUTING THE MEANS OF FORMATION OF DROPS 16 PROPERLY CALLED, WHICH ARE THEN DRIVEN BECAUSE THE EXIT FROM THE EXTRUSION LINE THEY ARE COVERED BY THE EXTRUDED PIPE 17 , THIS COVERING BEING CARRIED OUT AT REGULAR SPACES OR INTERVALS, DEPENDING ON THE EXTRUSION SPEED OF THE PIPE AND THE RATE OF SUPPLY OF THE DROP FORMING MEANS 16. THE INVENTION APPLIES IN PARTICULAR TO WATERING.

Description

The present invention relates to a method for obtaining pipes

  drop irrigation, providing many advantages over systems

already known.

  Therefore, the method according to the present invention aims to obtain a plastic pipe with incorporation of the appropriate element (s).

  charged to realize the watering for drops.

  At the base, the plastic pipe is obtained by extrusion and in the appropriate extrusion process is incorporated the elements constituting the actual means forming the drops, so that the introduction of these means into the pipe is carried out

  at regular intervals previously established.

  These drop forming means consist of cylindrical elements with an external thread constituting a passage for the water, and in this threaded passage occurs the decompression of the water so that it exits at the minimum pressure and that

produce watering by drops.

  This system or process, although not widespread, is known, but the method according to the invention follows phases or steps which determine that the drip irrigation pipe thus manufactured is very advantageous from both an economic and a technical point of view. to all those who already exist. On the other hand, in the names of L'Elité espagels n0183.258 and 189.807, in the name of the same applicant, are described means for forming "monoblock" drops, which are of the screw or external thread type and which are precisely designed to be able to be introduced in a plastic pipe without having to cut it and turn it to join them.With the other means of forming drops, the introduction into the pipe necessarily requires cutting and turning the latter to bring them together. Other after introduction The drop forming means according to the present invention is of the "monoblock" type such as those which are

above mentioned.

  The present invention also relates to a method of manufacturing a continuous plastic pipe for watering where it is not necessary, by a posterior operation, to insert or couple droplet forming means to drive them. and incorporate them intermittently by a system of

"intrusion".

  It starts from a traditional line to extrude a plastic pipe, the extruding machine being provided with an angular head similar to those used to cover cables. To this known system, we add a series of variants forming part of the present invention and which are described below: a) The angular head is sufficiently sized to allow to house, in its internal part, a

  cylinder constructed of an insulating and anti-

  heat "Teflon" which, acting as a nucleus, has in turn the ability to move axially and at will through the die. Inside this cylinder advantageously pass guides, the drop forming means which later and at the outlet of the die are entra1és and covered by the extruded plastic tube at intervals between them, which depend on the speed pipe extrusion and delivery rate of

means of forming drops.

  b) The angular head is mounted so that its inlet has a suitable angle of inclination with respect to the natural axis of the extruder, in order to facilitate, with the slope, the sliding of the cylindrical elements or means for forming drops. who will enter and the subsequent training of these by the plastic tube passing through

  the exit of the die of the extruder.

  c) The feeding of the drop forming means to the head is carried out in the following manner: At a suitable height is a hopper shaped container for feeding these elements.

  or means for forming drops which, via a channel, fall

  bent on another vibrating cylindrical container,

  controlled by automatic level sensors.

  This cylindrical container, placed in an intermediate plane between the hopper and the angular head of the extruder, is internally provided with small channels through which, by means of vibrations, the drop-forming means move upwards in an orderly manner until The output of the vibratory container, which in turn, via another channel, communicates with the entrance of the angular head. The advance caused

  by the intensity of the vibrations, is regulated by a

  tiometer according to the most appropriate feed rate for the intervals that are thought to be established between the drop forming means, in relation to the extrusion speed of the pipe which, in turn, can be adjusted to motor way at speed

variable that the extruder possesses.

  d) With regard to these drop forming elements or means which in this way are covered by the extruded pipe, they consist of cylindrical hollow parts, which are externally and at least two thirds of their length, are threaded of a screw thread divided into three distinct directional direction sectors, that is to say towards the

  right, to the left and again to the right.

  The water flowing through the pipe passes through the interior of the droplet forming means and communicates with the bottom of the thread by two diametrically opposite orifices located at the beginning of these threads, so that the water must necessarily go through the threads along the entire length. The change in the flow of water during the passage through the three sectors, rotating in different directions, causes in addition to the resulting pressure drop, a very favorable turbulence to avoid sedimentation caused by obstructions

  in other types of drop forming means.

  At the end of this screw thread, the water encounters a decompression chamber which, in turn, communicates with grooves located on two mutually opposite appendices which protrude from the outer smooth portion which exists in the drop forming means. , in continuation of the step of screws. Once mounted by the exit of the die, the drop forming means which has slid across the slope inside the angular head, is stopped or pulled and covered by the material coming out of this die, thus configuring the plastic material in turn, according to the geometric form of the drop forming means, so that the pipe has protuberances at the points which coincide

  with appendages in the droplet forming medium.

  e) At the exit of the extruder, the pipe penetrates by immersion in an open compartment of water, and, by guide rollers, at the same time

  that it undergoes a pre-cooling, the. pipe. ac-

  theorizontality to enter continuation in another compartment or bath larger and closed, planned to be able to make a slight vacuum which ensures by means of rings or rings of support, the calibration

correct outside of the pipe.

  As a result of this bath, other means of traditional type can be added if necessary,

  until the total cooling of the pipe is achieved.

  (f) After the last bath and before the pipe carriage, is located on the same line of manufacture, a table or bench with a device which consists essentially of a guide and two circular milling cutters located on each side and at right angles to each other. relative to its axis. At the passage of the tube by this guidance, all the protuberane eroduitespEr the appendages of the means of forming drops which at intervals

  are introduced inside the pipe, are automatic-

  cut off, opening the communication allowing the passage, and when the water flows through the pipe, it infiltrates by the screw of the means of frmation drops and by these cuts, it comes out in the form of drops to the outside . Following this operation, the cylindrical bodies

  or means of forming drops introduced alternately

  inside the pipe are automatically transformed into actual drop-forming means, and this pipe may be directly intended for drop irrigation, even though it is extruded, by means of a speed drive carriage variable

  and wound on the corresponding coil.

  The invention will be better understood and other purposes, features, details and advantages thereof

  will become clearer during the description

  explanatory document which will follow with reference to the accompanying schematic drawings given solely by way of example illustrating an embodiment of the invention and in which: - Figure 1 shows a schematic view of the various phases involved in the process to obtain the pipe o is incorporated the drop forming means; Fig. 2 shows a side view of the pipe, partly in section, where the drop forming means which is incorporated therein can be observed; and - Figure 3 shows a cross-sectional view

  of the pipe with the drop forming means.

  In all the figures, the main parts and elements that make up the subject of the present invention are designated as follows: the reference numeral 1 designates the machine to be extruded, 2 the angular head, 3 the feed hopper into means for formatting drops, 4 a vibration selector of the position of the drop forming means, a rotary distributor, 6 a motor, 7 the extruder hopper, 8 the first water bath, 9 the guide rollers, a bath closed, there is an additional bath, 12 the guide stand with the two cutters, 13 the drive carriage, 14 the cutting or cutting device, 15 the winding means, 16 the drop forming means, 17 the pipe, 18 the thread of the drop forming means 16, 19 the bottom of the thread 18, the decompression chamber, 21 the grooves in the drop forming means 16 and

  22 the appendages of means for forming drops 16.

  According to FIG. 1, it is possible to observe an extrusion line according to the method of the invention and in this line is naturally arranged an extruder 1 provided with the corresponding angular head 2 which is sufficiently dimensioned to allow it to be housed therein a cylinder of insulating material which, acting as a core, has the possibility of moving axially

  and at will in the appropriate sector.

  The traditionally guided drop forming means pass through this cylinder, so that at the outlet of the die, they are driven and covered with the extruded plastic tube, at regular intervals which depend on the extrusion speed and

  the rate of the contribution of means of formation of drops.

  The angular head 2, for its part, is mounted so that its inlet has a suitable angle of inclination with respect to the axis of the extruding machine, to facilitate, by the slope, the sliding of the cylindrical elements or means droplets that penetrate and their subsequent training by the plastic tube that leaves the

  output of the die of the extruding machine.

  The feed of the drop forming means 16 to the angular head 2 is performed from a feed hopper 3 located in an upper plane, so that of this hopper 3, the drop forming means fall on a breeder. 4 o position they go to a vibrator 5, being controlled by automatic level sensors. This vibrator 5, actuated by a corresponding motor 6 and disposed in an intermediate plane between the hopper 3 and the head 2, is provided with channels through which the drop forming means 16 rise in an orderly manner until the output of the vibrator 5 which in turn,

  communicates by another channel, with the entrance of the head 2.

  On the other hand, the product contained in the hopper 7 will be the one that will form the tube or pipe 17, so that at the outlet of the extruder 1, the pipe penetrates by immersion in a water bath 8, and at the With the aid of guide rollers 9, at the same time as it undergoes pre-cooling, the pipe acquires horizontality and then enters a closed bath compartment 10 provided for a slight vacuum which ensures, by means of rings or rings, the perfect outside calibration of the pipe. As a result of this bath one can have another additional bath 11 so

  to ensure total cooling of the pipe.

  After this last additional bath 11 is arranged a table or bench 12 provided. of a device consisting of a circle and a circular blank, placed

  on each side, and at right angles to the axis.

  Following the corresponding drive carriage 13 is disposed the cutter 14 followed by the means

corresponding winding 15.

  At the passage of the tube 17 by the mentioned guide, all the protuberances formed by the appendices

  means for forming droplets 16 are automatically

  cut, thus opening the communication that allows the passage when the water flows through the pipe 17, thus it filters through the thread of the means 16, and leaves

  outwards in the form of drops.

  With regard to the drop forming medium 16 themselves, they are covered with the extruded pipe at the outlet of the head 2, and are formed of cylindrical and hollow bodies which, externally, and at least on two-thirds of their length , have a screw pitch or thread 18 divided into three sectors of distinct directional direction, as can be seen clearly in Figure 2. The water flowing through the pipe 17 passes inside the drop forming means 16 and communicates with the bottom 19 of the thread or thread, by two diametrically opposed orifices located at the beginning of the thread 18 so that the water is

  forced to travel the entire length of this thread 18.

  At the end of this threading, the water meets a decompression chamber 20 which, in turn, communicates with

  grooves 21 located in two appendages 22 diametrically

  opposing and protruding from the smooth outer part of the

  drops 16, in continuation of the threading 18.

  Of course, the invention is not limited to the embodiment described and shown which has been given by way of example. In particular, it includes all the means constituting technical equivalents of the means described as well as their combinations if they are executed according to its spirit and put

  implemented in the context of protection as claimed.

Claims (5)

R E V E N D I C A T I 0 N S ____________ _____________   1. A method of obtaining drop irrigation hoses from a traditional extrusion line by means of which the hose is made from   plastic itself, the extrusion machine com-   both an angular head, characterized in that said angular head (2) is sufficiently-sized to allow to house therein, a cylindrical hollow body, constructed of an insulating and anticaloric material, having the possibility of move axially along the extrusion die, and inside said cylindrical body pass guides of the elements constituting the means of formatDon properly drops d1i which are then driven because at the exit of the extrusion die they are covered by the plastic pipe (17) which is extruded, this covering being made at regular intervals or spaces, depending on the extrusion speed of the pipe and the feed rate means for forming drops.   2. Method according to claim 1, characterized in that the angular head (2) is mounted on the extruder (1) so that its inlet has a suitable inclination angle with the natural axis of the machine, for facilitating, by this slope, the sliding of the drop forming means (16) which penetrate into the head and. their posterior training by the plastic pipe (17) going through the exit.   3. Process according to any one of the claims   1 or 2, characterized in that the elements constituting the means for forming drops are collected in a hopper (3) located in a plane greater than the head (2), so that by a channel, said means for forming drops fall, being controlled by level automatic sensors, to a cylindrical container located in an intermediate plane, said container constituting a vibrator (4) internally provided with small channels through which the drop forming means move in order until the exit said vibrator, which in turn, via another channel, communicates with the input of the head, the advance caused by the intensity of the vibrations being set   by a potentiometer according to the feed rate most appropriate.   4. Method according to claim 1, characterized in that the cylindrical bodies constituting the above-mentioned drop-forming means (16) have at least two-thirds of their length outside, a thread or thread ( 18) divided into three sectors of distinct directional direction, said thread or screw thread communicating with a suitable conduit that determines the cylindrical member of the drop forming means, by means of two diametrically opposed ports located at the beginning of the appropriate thread, and between said threading and the inner surface of the plastic tube (17) is formed the outlet passage of the water outwardly, at the end of said threading finding a decompression chamber (20) which in turn communicates with grooves (21) in two diametrically opposed appendages (22) projecting from the smooth and outer portion of the surface of the drop forming means,   after the chamber and the end of the thread.   5. Process according to any one of the claims   preceding, characterized in that at the outlet of the extrusion die and between the bath (10) and the cooling carriage (13) is arranged a device (12) consisting of a guide and two strawberries -circular cutting, which automatically cut the protuberances of the pipe produced by the protruding parts or appendagesde means of forming drops, thus opening the communication outwards.