DE2807556A1 - METHOD AND DEVICE FOR FORMING A FLOOR ON AN OPEN END OF A PLASTIC PIPE - Google Patents

Description

SHIP ν. FDNER STREHL SCHÜBEL-HOPF EBBINGHAUS FINCK

DA / G-K1925 -7-

Honor exercise

The invention relates to the closing of thermoplastic pipes _r having an open end, whereby a pipe sheet is formed from the material of the previously open-earth pipe. The invention particularly relates to a method and apparatus for forming a bath at an open end of a Plastic pipes - without the use of additional material.

As is known, the end of an open pipe made of a thermoplastic material can be closed without a separate: stucco for formation; the floor needs to be fixed. According to the known. Method and known device for closing an open-ended pipe at one end: the end is at the beginning; heated _e so> DAJ it expands outward. A bushing is then pushed forward over the flared end in order to compress the outer flared end. Then, ¹ a mandrel into the tube is inserted while a '. Tool or a tool cooperate with the pipe and the sleeve so that the compressed end is closed (US-BS 2 816 4SSJ ^ The dome, which is inserted into the pipe before it is closed, is not heated. With the known method - only small tubes are closed, for example catheter tubes with an inside diameter of 4.8 ram. »

In another known method including apparatus To close the open end of thermoplastic tubes, the open end of a tube is placed on a mandrel is, xrt brought into contact with a cup-shaped part. Afterward a heating element is brought into heating contact with the cup-shaped part on the side that is open End opposite, while the mandrel carrying the pipe forward

M / C-KT925 -a- 2.80? 5 & e

is moved> to squeeze and close the end of the tube. The heating element will retract while the tube mat the cup-shaped part remains in contact «, Lich the cup-shaped part is cooled and the closed one Tube withdrawn from the cooled cup-shaped part CUSPS 3. 3 & 0: 55SH ^ The fountain is heated ^ rridrt ..

According to a similar known method including device, the cup-shaped part is heated directly (US-PS 5 509 252). The cup-shaped part does not have to be the end of the tube close completely. To completely close the pipe end and to produce a finished base is Another cup-shaped part is provided: soft relative is cool; A heating of the cathedral, before contact is made by the Cup-shaped part takes place, is not provided.

The object on which the invention is based therefore exists is to create a method and a device of the type mentioned, with which open-ended pipes, in particular Thermoplastic pipes that have a considerable diameter can be closed quickly, effectively and reliably in an elegant manner permit.

This object is inventively achieved in _t that 'an open ended thermoplastic tube from a darn worn _r is extending in the longitudinal direction in the tube while the mandrel and the tube are simultaneously heated, so that the end of the open-ended tube extending outwardly expands away from the heated mandrel. The expanded end of the tube is compressed by contact with a slidable or extendable sleeve that surrounds the open ended tube and mandrel. The compressed end is then closed to form the bottom of the tube by having the compressed end with. is brought into contact with a mold, the temperature of which

DA / G-K1925 -9-

. 280755ß

is considerably lower than that of the thorn. Doing this is the soil formed over the end of the heated mandrel. The shape can then removed from the bottom and · the mandrel - Subsequently the mandrel is separated from the newly formed tube sheet and removed from the tube.

Conveniently, the mandrel and the open ended tube heated by radiation from a source adjacent to the open end of the .Pipe is arranged. Preferably that will Sohr lind -the thorn heats up for a period of time which is substantially is longer than the period during which -the form with the -compressed end of the tube is in contact. He wishes is to heat the sleeve at the same time as the mandrel and, while heating, advance it so that the compression of the flared end is optimally achieved.

In accordance with the present invention, a plurality of open ended tubes can be supported by a plurality of mandrels at the same time. The plurality of tubes wxxdt carried by the plurality of mandrels is preferably heated, then heated -Simultaneous and compressed and then simultaneously closed. When the open-ended Rolire are supported by a plurality of spikes, the contact of the compressed carried out; Ends of the tubes preferably with a resiliently resilient shape held in such a way that differences in length are compensated for.

To carry the ears on the multitude of thorns at the same time to be able to., a desk is provided that a variety of ven © ornen has. Which in a multitude of positions on the © are arranged in a row. · The heating-, the ^ heating and -compression and then closing cans at a large number can be reached by stations around the turntable arranged -are.

DA / G-K1925 -10-

280755 «

According to the invention is thus a floor in a pipe which has an open end, -due to the fact that the tube heats up which is carried by a mandrel, a sleeve being slid over the end of the tube, which during of heating has been expanded outwards xmd by the Shifting compressed or deformed conically downwards will. The compressed end of the tube is closed by that it is brought into contact with a mold which cooperates with the sleeve to form the bottom.

The invention thus relates to a method for forming a base at an open end of a plastic pipe without Use of additional material in which the open end of the tube is heated, expanded outwards, then pushed over a sleeve and compressed by means of an externally acting Form and a mandrel introduced into the T-ear Formation of the bottom is sealed. Be according to the invention while the mandrel introduced into the tube and the open end of the tube protruding over it for expanding the open one At the end of and during the transfer of the pod, the pod appeared continuously together heated.

The invention is explained in more detail, for example, with the aid of the drawings

Fig. 1 to 4 in longitudinal sections the successive working steps to close the open end of the tube and

Fig. 5 is a plan view of a «. Rotary table for closing a variety of xz £ feneadigen tubes for rapid ^ series production ^,

43as shown in Fig. 1 ofxenendi.ge pipe 10 is the first .Sehritt -the roundabout drive brought to a Born 12 asf

809854/6 ^ 0

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The urine 12 harp erne one shoulder- Γ4 ,. at which one end of the tube t & rests »if it, from dent Eoxn. T 2- is worn, the tube tO is surrounded by an ESlse Ή>, where the- end of the tube- TO = that should be closed- extends over the end of the sleeve % & and the end- of- Doras ΐ2 extended out

As can be seen in Fig- Z, the tube tCt and mandrel are? 2 and the sleeve _t heated by a radiation source 16, or the end of ^ the end face of the mandrel 12 _e the Röhrender to and the sleeve 16 relative to and in located near it. The source shown in FIG. 2 consists of a gas flame 18 _r which produces an outwardly directed widening 20 at the end of the tube tO.

According to FIG. 3, the sleeve t6 is pushed forward _t while the tube IQ, the Born Ϊ2 and the Dohr ΐ & -further heated, so that the end of the tube tQ in the area 22 is pressed inward or compressed. Efie sleeve 16 can be advanced in various ways .. Thus, _r ^ as shown, a spring 24 between a stop 26 and an arm, are arranged 28-. At the beginning and during the operations illustrated in Figures 1 and 2, in which the spring is not shown, the spring 24 is kept under tension while the arm 28 is in a position adjacent the shoulder t4. of the dome is locked. In the position shown in Eig ^ ϊ the arm 2 & is released _t, whereby the sleeve t & is displaced forwards into the extended position of Fig. 3.

According to FIG. 4, a mold assembly 30 is moved into a position in which it is in contact with the end of the sleeve 16 and the compressed Section 22 of the pipe 10 is standing, whereby the pipe tO is closed and a bottom 32 is formed- At this time the spring 24, which engages the sleeve 16, is again under Tension is set, which ensures that the sleeve 16

£ 09834/088 &

DA / G-Kt925 -12-

is held in contact with the mold 30, whereby the bottom 32 is formed in the desired shape.

The mold assembly 30 has two separate sections, namely a sleeve section 34, the inner diameter of which is a sliding one Sliding over the outer periphery of the tube 10 is allowed in contact with the end of the sleeve 16, and a central molding portion 36 with a slightly concave surface 37 that corresponds with comes into contact with the compressed portion 22 of the tube TO to form the bottom 32. Between the forming section 36 and the end 39 of the mold assembly 30, a spring 38 is provided, so that changes in the thickness of the bottom 32 can be absorbed, which are due to a lengthy period or a shorter tube 10 can result. After the end of the tube 10 has been closed, the mold assembly 30 can and becomes nearly withdrawn immediately, which is explained with reference to Fig ^ 5 will.

The mandrel 12 is heated simultaneously with the tube TO and the sleeve, so that the end or the end face of the mandrel 12 came to serve as a shaping surface which interacts with the relatively cool mold assembly 3tt. It has been found that heating the mandrel 12- whereby it can be used as a forming surface enables large tubes to be closed. In this way, pipes with a diameter of 5 cm can be closed. In addition, the closing of the tube take place very- rapidly _r wherein a product is obtained which turns _r pleasing: Appearance has or is shapely. The rate _r at which the ends are closed account assigned ,, follows: for the fact that the mold assembly 30 nieht beheiz-t or is compared at least with relatively cold dent mandrel Ϊ2 _r is such that it immediately after the Versehließen Röhrendes eittf can be erred. Simultaneously with the withdrawal of the form anora-30 and the separation from bathing 32, the thorn % 2 begins

in preparation for the ejection of the pipe 10 from the mandrel 12 to cool down »

The device shown in Fig. 5 is used for the series production of pipes with closed ends. On a turntable 4 0 is thereby a plurality of mandrel sets 42 are provided, which are rotated by a plurality of stations a to f =

In station a, a plurality of tubes 10 are applied to a set of mandrels 12. The turntable 40 moves then to the first heating station b, in v / elcher a gas burner 18, the tubes 10, the mandrels 12, not shown, and the sleeves heated. The turntable 40 then rotates to the next heating station σ, in which a gas burner 18 ~ the tubes 10, the not shown mandrels 12 and the sleeves 16 heated by means of radiation. In station d, a gas burner 18 takes care of the further Heating of the tubes 10, the mandrels 12 and the sleeves 16. The sleeves 16 are now pushed forward so that the open ends of the tubes 10 are compressed, in the station -e of the turntable, mold assemblies 30 for each of the plurality of mandrels 12, not shown, are advanced so that the closed ends 32 of the tubes are formed. They are then withdrawn. Then the mandrels 12 to Station f is moved forward, where the pipes 10 with the closed bottoms 32 are thrown off or withdrawn from the mandrels 12.

As can be clearly seen from Fig. 5, the heating of the mandrels 12 allows a molding surface which is not related to the mold assembly 30 belongs, but is formed by the ends of the mandrels 12 g-e, -which the required high temperature is reached without delaying the closing process. "It goes without saying that that -a mold surface. which is too hot, not from the Floor 32 can be separated without changing it or to deform. The mandrels 12 have time to cool, namely from

809834/0860

BAD CE-QlHfJ.

2 S Ü "/ b b b

Until the time when they reach the time of the Sehließens in the station, the station e f. The cooling begins "when the mandrels 12 leave station d" If the heating were done by means of the mold assembly 30 and the molding sections 36 formed the heated molding surface, cooling the molds before separation from the tubes 10 would require that the turntable remains in this position long enough to allow the molds of assembly 30 to cool after the assembly 30 is closed and before the assembly 30 is withdrawn. As a result, the time that would have to be assigned to each position of the turntable would be very long, which would delay the ear-closing process.

From Fig. 5 it is also possible to compare the with that for the Closing the pipe ends to form the bottom 32 has a relatively long space

while aera heats the mandrels and tubes

will. When passing through station b until dara turntable 4 0 heated while closing the tubes only takes place in station e. This gives the mandrels 12 a very high temperature, which increases the effectiveness of the molding surface the mandrel 12 in preparation for its function is ensured in station e, in which the ends of the tubes are closed will. The resiliently elastic mounting of the forming section 36 is particularly important for receiving pipes 10 different lengths that can be placed on the mandrels of a single set.

The method according to the invention and the device according to the invention are suitable for the use of a variety of thermoplastic materials ^. According to the invention, pipes can be closed are made, for example, of cellulose butyrate, of polypropylene, of polyamide, of polytetrafluoroethylene and of polyethylene exist. The required temperatures that must be reached by the heating devices 18., 18 "and 18, can vary as a function of the particular thermoplastic

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BATH ORiGfMAL

Change the material and the dwell time in each station. on In this way, temperature regulation is achieved when the tubes are heated.

The very fast production with the turntable can also be achieved by placing a number of thorns on one Conveyor belt can be arranged, which is allocated to moving workstations, which are arranged along the conveyor are. The forming surface does not need to be a mandrel that carries the pipe, but can also be made from another element which is inserted into the pipe and heated. It is also not absolutely necessary that the shape be outside of the Tube remains unheated in contrast to the forming surface inside the tube. With certain materials it is advisable the mold is heated. Instead of the concave shape described, a flat or convex shape can also be used.

Sörtf 34/08 £ 0

Claims (1)

Claims 1. Method of making a. Plastic pipe with a Bottom from a pipe with open ends without using additional material for the formation of the bottom, thereby characterized in that the open-ended tube is heated so that the end flares outward, that the expanded end is compressed and that the compressed, previously expanded end is closed, to form the bottom adjacent to a heated mold surface that is located inside the pipe. 2. The method according to claim 1, characterized in that that the open ended tube is carried on a mandrel which extends longitudinally into the tube, that the mandrel and the tube are heated simultaneously so that the end of the open ends having The tube expands outwardly from the heated mandrel so that the expanded end is in contact with a sleeve. ORIGINAL INSPECTED DA / G-K1925 -2- 2B O 75 is compressed, the one having the open ends Surrounds the tube and the mandrel and is telescopically movable with respect to the tube and the mandrel, and that the compressed, previously flared end is closed, thereby forming a bottom by the compressed end is brought into contact with a mold which is substantially colder in temperature than the mandrel, wherein forming the bottom over the end of the mandrel, separating the mold from the formed bottom and mandrel, and that the mandrel is separated from the tube after the mold has been separated from the bottom and the mandrel. 3. The method according to claim 1 or 2, characterized in that the mandrel is heated while the The end is squeezed. 4. The method according to any one of the preceding claims, characterized in that the mandrel and the open Tube having ends are heated by radiation. 5. The method according to claim 4, characterized in that that the mandrel and the open ended tube originate from a source located near the end of the mandrel are located, are heated by radiation. 6. The method according to any one of the preceding claims, characterized in that the tube and the mandrel be heated for a period of time that is significantly longer than the period of time during which the mold is compressed End of the tube is in contact. 7. The method according to any one of the preceding claims, characterized in that the sleeve simultaneously with DA / G-KT925 -3- the mandrel and the open ended tube is heated. 8. The method according to claim 7, characterized in that g- e k e η η, that the mandrel, the sleeve and the open ended tube from one adjacent to the mandrel face arranged radiation source are heated - 9 ". The method according to one of the preceding claims, characterized in that the open end of the tube ^1, the gegenüherliegt the compressed end at. A shoulder of the mandrel abuts. .TOV method according to one of the preceding claims, characterized. g ekeniLze i c h π e t, - that the form is what is compressed Resilient elastic contact with the end. VX ^ method according to exnent of the preceding claims ,, thereby g. eken η ζ e. I et η that the Born wiräL cooled _r "is closed while the compressed end. 12. The method according to one of the preceding claims, characterized g ^ ek enn.z ei chne t that a multitude of open End-to-end tubes at the same time from: a plurality borne by thorns. 13 ·. Are heated according to claim T2, characterized ^ g ~ _r et ekennz.eichvn that- the open-ended pipes on ", the mandrels and sequentially. Closed process. 14. The method according to claim T3 _t characterized, ge ke η π- ζ eic η π et that the tubes are heated and compressed before closing .. t5v method according to claim 14 ₁ - geke η η ζ calibration: - net that the open ended tubes on the Thorns are heated at the same time, heated and compressed at the same time and closed at the same time. 16. The method according to any one of the preceding claims, - characterized, characterized in that the temperature: the molding surface laugh is controlled »-. Xl . Procedure, after a? of the preceding claims _r characterized g: eke ir rr 2- eie 6 η et that the bottom on. an adjoining shape _P which is located outside the tube,. tS * method according to claim 1 ?, thereby marked zeiclrn e t that "the temperature of the outside fern is independent on the temperature of the: forming surface inside is controlled: ^ 19. Device for forming a bottom at an open end of a plastic pipe without using additional material, in particular for "performing the method according to one of the preceding claims, geke η n. Characterized by a mandrel V \ 1) _r which extends in the longitudinal direction in extends the tube CIOF and carries the tube, -through a sleeve (1G >> which surrounds the mandrel ttZ £ with a gap for receiving the & Rohres (LtQc ^ and is movable relative to the mandrel. Ct2t in order to compress the end to be closed , by a shape (3GrJr the one with the sleeve (16) and the mandrel i% zy for closing the compressed: end f22 £ of the tube O &> and for the formation of the bottom (32i cooperates, and by means of CIS) for heating the dome (12 £ _t without heating the mold (30fJ becomes =. 20. The device according to claim tS, characterized gekenitzeich it e tjL that äjEe facilities O&I for heating ä & s mandrel DA / G-K1925 -ΞΙ 12) also heat the sleeve (16) without changing the shape (30) to be heated. . Device according to Claim 19 or 20, characterized in that the devices (18) for heating have a source of radiant heat. 22. Device according to one of claims 19 to 21, characterized by means (4 0) for the advancement of the mandrel (12) and the sleeve (16) from the heating devices (18) to the molding devices (30). 23c Device according to Claim 22, characterized by a turntable (4 0), which rotates past a plurality of stations (a to f), the mandrel (12) and the sleeve (16) is attached to the turntable (40) and the heating means (18) to one of the stations (b, c, d) and the mold (30) are arranged at another station (e). 24. The device according to claim 23, characterized in that the heating devices (18, I82, I83) are arranged ^on more (b, c, d) than one of the stations. 25. Device according to one of claims 19 to 24, characterized characterized in that the heating devices (18 .., 1 & 2, "18,) are provided for expanding the pipe end to the outside are. 26. The apparatus according to claim 25, characterized in that the sleeve (16) for a forward sliding over the Mandrel (12) is provided to the expanded end of the raw (10J make the heating squeeze. DA / G-K1925 -6- 27. The device according to claim 25, characterized in that the sleeve (16) for sliding forward is provided on the mandrel (12) to the expanded End of the tube (10) together during heating press down. 28. The device according to claim 27, characterized in that g e k e η η, that the sleeve (16) is adapted to slide backwards after contact with the mold (30) is. 29. The device according to claim 28 , characterized in that the mold (30) is held resiliently (38). 30. Device according to one of claims 23 to 29, characterized characterized in that the mold (30) has a sleeve portion (34) and a shaping section (36) which is resiliently elastic with respect to the sleeve section (34) is arranged to accommodate different lengths of pipe can be, wherein the sleeve section (34) rests against the sleeves (16) and the shaping section (36) with cooperates with the heated mandrel (12) to form the bottom (32) . 31. The device according to claim 30, characterized through a variety of thorns (12), a variety of Sleeves (16) and a plurality of shapes (30), the shapes (30) being simultaneous with the mandrels (12) and the sleeves (16) cooperate during the closing of the tubes (10) .