CN1105316A - Apparatus for making annularly ribbed plastic pipe and method of making such pipe - Google Patents

Abstract

A moving die-pressing way is used to dieing shaped thermoplastic pipes such as annular or spiral bellows, ribbed pipe, or basically smooth pipe, and includes a number of modules, which may move together forward in the same working path and step-come back in the same path while their relative positions are not changed.

Description

Apparatus for making annularly ribbed plastic pipe and method of making such pipe

The present invention relates to make the apparatus and method of ring-type or spirality ribbing plastic tube.

The thermoplasticity ring-type special pipe of semihard medium-soft such as bellows or ribbed pipe or the level and smooth pipe of tube wall all carry out in mobile mold pressing road by traditional handicraft.Conventional mobile mold pressing road is made up of the hot pressing module of two row circulations, and these modules are along the forward stroke amalgamation in mold pressing road, and extrusion direct presses direction to form mobile tubular mould.This mobile mold pressing road that is combined into by the half module of two row circulations is that this two row module synchronous operation of requirement gets complicated accurately parts, and large space supplies two row module reversion but also need very.When molded large diameter pipe, used space is excessive.For the optimum utilization useful space, the mobile mold pressing road of some routine has been designed to a stroke at another above stroke, rather than designs by stroke relation arranged side by side.

Existing people manages to provide the mobile mold pressing road of other type.The twisting module that proposes in No. the 854th, 988, the U.S. Patent application for example, in its device that provides, module hinge in together, is the loop on the same plane during mold pressing, need not during reversion to change towards.

Not relating to another example that moves the mold pressing road along the early stage type of different route reversion is Canadian Patent the 962nd, No. 412, in this Canadian Patent, a kind of the mold pressing road of being made up of two moulds proposed, every vertical mould is half of whole mold pressing road.During mold pressing, two mould amalgamations, and move forward with extrusion speed.Mould is opened every now and then and is moved backward.Therefore, mould can not move forward and leave the mold pressing district.This design involves two not only heavily but also accurately the moving of long half module tool.Two half module tools must be very long, so that be bearing in the pipe of wherein mold pressing during cooling shaping.

After a while, a kind of some similar mold pressing road therewith is disclosed in United States Patent (USP) the 4th, 911 respectively, and No. 633 and the 5th, 017, in No. 321.In these two patents, a kind of i.e. apparatus and method of two or three modules of small number of modules of using have been proposed in a mold pressing road.Each module all is divided into two-half die longitudinally, when the two-half die of a module pieces together so that during mold pressing, just moves forward along the parallel route of second below other module of lifting, occupies upstream position.This design is compared with the sort of mould of No. the 962nd, 412, Canadian Patent, and module is littler, the position is higher, more flexible, but the method that from the production line mobile module just makes the module reversion that need not is not provided.

The present invention is devoted to further consider the problem in space; Be devoted to the module reversion need not to change its towards the sort of device in, module is opened the problem that need not twisting; The problem that exists when also being devoted to module along same route reversion that it advances.

Therefore, the present invention tries hard to provide the device that a kind of module reversion route needn't the lateral run-out operating path.

According to the present invention, a kind of apparatus and method of molding thermoplastic special pipe are proposed.This device is made up of the mobile mold pressing road of a mold pressing pipe in operating path, and this mold pressing road is made up of at least two modules.Mould-pipe pressure surface of the fashionable formation of each module spliced, and can open to loosen the pipe of wherein mold pressing.In this device, the individual module in mold pressing road can both be along a loop intermittently substep reversion in accordance with regulations, the longitudinal axis in this loop is adjacent with the longitudinal axis of operating path.Like this, each module just moves around with linear mode, and each module will never pass one another.So, when each module all when the direction of extrusion all continues to move forward, their pulsatings reverse, so as with send into sending into of extrudate in the mold pressing road and keep a specific range.Tubular mold pressing road is normally columnar, but other tubular form also can be considered to adopt.

More particularly, the be shaped device of thermoplasticity special pipe of the present invention has: at least two modules, each module can piece together closure state to form a hollow mold pressing surface, and can under this closure state, open, each module can both move forward and backward along the axis of the tubular mold pressing surface advance and retreat direction by the mold pressing road; An elongated squeeze note mouth that has ring-type squeeze note hole inserts upstream one end along the mold pressing road that tubular mold pressing surface axis moves, so that section bar is squeezed in that module of upstream; Make each module together along tubular mold pressing surface axis, to accord with the equipment that the preceding line speed of mold pressing pipe moves forward in the mold pressing road; Make each module towards the direction opposite pulsation, and make the equipment that is in opening when being in closure state when module moves ahead then goes with preceding line direction; Each module that makes above-mentioned back row according to up-stream module prior to downstream and the successively equipment of back row in abutting connection with the order of module.

Up-stream module (being called first module herein), that module of promptly admitting the extrudate of the heat that the squeeze note mouth extrudes, its axial length should be greater than the reversion distance.Yet the reversion distance can be quite short.Therefore, the up-stream module of the extrudate that initial mold pressing squeeze note mouth is extruded, also can corresponding weak point a little.Annular squeeze note hole can be single annular aperture, if process the pipe of two-layer tube wall, then can be made up of coaxial several holes.

It is believed that up-stream module is short as far as possible not only, not only light but also flexible, and potential advantage is arranged.For example, only this module is pulsed backward, is exactly can be a mold pressing shape, ring-type crest for example, recessed section from downstream that a corresponding female section of section bar is clamp-oned the next-door neighbour again.Certainly, pulsation backward can be skipped several shapes.No matter backward pulsation only to cover a shape still be several shapes, the position that the module of having retired all must be complementary in the shape of the mold pressing shape of module and the extrudate that has been shaped is once more the extrudate inclusion that has been shaped.Therefore, should be more frequently retiring intermittently of rule, and retire distance and should lack, just meet the requirements.

Extrudate is from the position that the squeeze note mouth is clamp-oned mobile mold pressing road, and always in a closing section in mold pressing road, this point is important really.Therefore, the length of a module must be more longer by the preset distance that fore-and-aft direction moves than it.It is its initial point that moves forward that module of inserting when the squeeze note mouth is positioned at its upstream end, and the aperture of squeeze note mouth can be positioned at the downstream area of this module.When this module moved forward the aperture of process squeeze note mouth, aperture should be positioned at the upstream region of this module.Move forward and before leaving the squeeze note mouth in this module, reverse moving must be taken place.

Adjacent module in the up-stream module downstream (being called second module herein), length can be the same with up-stream module or different.Though all modules can have the such auxiliary equipment of the cooling device of image tube, this adjacent downstream module can be longer than up-stream module, and can specially be used for loading the device of cooling extrudate.In any one module or all modules, cool off, can use water-cooling pattern, also can use the air cooling mode in some cases.

In another kind of working method, can synthesize composite modules to two short modules, and move together.

If use more than two three modules for example, so, comparable second module of that module of downstream is short again.It is beneficial to hold the pipe that is being shaped with a supporting plug.Open when first module, unclamp the soft extrudate of firm shaping, this module is only short backward to move one little section, and it again can be not closed before extrudate also has distortion.And this supporting that is engraved in the extrudate of shaping just benefits.Second and all the other modules of downstream can be corrected because mould unclamps any distortion of losing shape that occur on the pipe a moment.In any case this distortion of losing shape all can not be more severe than vestige due between each module of pipe adjacency in the mobile mold pressing road of routine.

Certainly, pulsation will fully take into account the speed that extrudate constantly is processed as finished product back and forth, and does not make its curved distortion of hanging down.When processing large diameter pipe, normal extrusion speed (thereby being exactly the speed of service in mold pressing road) can be between 1 meter to 2 meters of per minutes.

In sequence of modules, can use number of modules.As in any mobile mold pressing road, those modules of upstream are moved, and originally working most in the mold process, and the forming tube period of the day from 11 p.m. to 1 a.m that those modules of downstream are being cooled off in supporting play more important role.In this device, perhaps two modules are just enough.Wherein, first is the aperture that up-stream module is holding the squeeze note mouth, and is mobile repeatedly with the mode of quick-return to move ahead at a slow speed, plays the most positive mold pressing effect.Second module then supporting the pipe of die forming, and especially during first module reversion, it more works.All the other modules in downstream provide further supporting role.

Yet perhaps the optimal number of module is three.

Certainly, also available more than three modules, still, with multimode so will adding set parts and equipment, compared with using three modules may not have many significantly benefits.

According to routine, each module all is contained on the bearing.Each bearing moves before and after can be on a longitudinal rail, each module all can by on own bearing, become with the bearing moving direction transversal to and two half modules slidably reciprocating are formed so that the whole module of folding.Each bearing can lean on a groove and a joint tongue, and the bottom that promptly is combined into that two halves of whole module with the bottom of the module of its supporting cooperates.The comparable module that is mated of each bearing is wideer, and like this, the joint tongue that the trough of two half modules just can embedding be lived bearing slides, and slidingly forms closed tubular module when holding together, and module is just opened when sliping off.

Though the present invention generally is a device of addressing the band bearing,, the device of other support pattern and other alignment modules also can be used, and for example, available supporting guide rod replaces bearing and any guide rail.

The folding of module can arrive in module and opens or during closed precalculated position, to finish by the startup sensitive switch and then by hydraulic mechanism.In addition, this folding also can be finished by cam mechanism or other known mechanism of those skilled in the art.Moving the mechanism of each module reversion in backhaul, can be any conventional mechanism, and for example which kind of mechanism cam mechanism or hydraulic mechanism select, and decide according to the mode of driver module.In fact, module can be thrown off the transmission of advancing continuously and be engaged the reversion transmission.The half module of module can fully slip off mutually, also can open with twisting mode or other any usual manner.

When module began to move ahead, its location was very important.If make bellows or grilled tube, accurately the location is very important to make module, so that guarantee the continuity of pipe.Like this, location when module begins to move ahead, on the pipe that has been shaped, what just be shaped at least is the ripple of upstream, should match with the corresponding downstream mold pressure surface of module.This accurate location of module and corresponding pipe, available any usual manner is realized.

Now contrast drawing, illustrate one embodiment of the present of invention, wherein:

Fig. 1 is the perspective view according to a kind of mold pressing of the present invention road;

Fig. 2 be in the mold pressing shown in Figure 1 road amalgamation the perspective view of module;

Fig. 3 is the perspective view of module shown in Figure 2 when opening;

Fig. 4 A to 4G shows in the mold pressing shown in Figure 1 road, each module in the circulation of mold pressing pipe in the different phase present position;

Fig. 5 is the schematic diagram in a different mold pressing road of block length.

Fig. 1 represents that mold pressing road 10 moves along the arrow A direction on guide rail 12.Extrusion nozzle 14 is extended forward from the extruder 18 that only draws roughly, enters among module 16A, 16B, the 16C in mold pressing road 10.Squeeze note mouth 14 has a feed point 20, is positioned among the mold pressing road 10 of mold pressing pipe 26.

Each module 16A, 16B, 16C are made up of two half modules, these half modules can be on bearing 22 toward each other or mutually liftoff slip, these bearings on guide rail 12 can move towards two along guide rail.Each bearing top all is that the both sides chimb that the axis with guide rail 12 is 90 ° of horizontal expansions is a joint tongue 24.This joint tongue 24 can be slidingly matched with the trough of each half module bottom of module 16A, 16B, 16C, and like this, these half modules just can be slided or slip away.

When these half modules slip away, just leave pipe 26.When these half module cunnings are held together, on amalgamation diametral plane 27, mutually during amalgamation, form tubular module.If desired, can on the die face of each module 16A, 16B, 16C, use suction pipe to strengthen the mold pressing effect.Technology is used this suction pipe routinely, does not give unnecessary details at this.

For each bearing 22 and the module 16A that is mated, 16B, 16C are all moved towards the direction of arrow A (seeing shown in Fig. 1 and Fig. 4 A to 4G), can use any conventional mechanism.For example, available its track 28 with dashed lines in Fig. 1 is retouched the circulating conveyor chain that shows and is bitten driving lug 30 on the bearing.Also available ratchet mechanism.This mainly sees how to select for use, in any mode of this special recommendation.Yet single direction ratchet mechanism may be better for making bearing reversion easily in backhaul.Which kind of type of drive that don't work, all should make each bearing 22 and the module 16A that is mated, 16B, 16C meet extrusion speed along the speed of arrow A direction operation is the speed of production that extruded hole 20 is extruded extrudate on the extrusion nozzle 14.

In the illustrated embodiment, three module 16A, 16B, 16C have been used.This is not in order to limit to a number or amount, and uses more multimode or only uses two modules can.In the following description that the technological process of making annular ripple plastic tube or screw thread plastic tube and so on ring-type abnormity thermoplastic pipe is done, just can be expressly understood the further feature of this device.This device also can be produced the spiral special pipe, and in this specification and claims book, " ring-type " speech also comprises " spiral ".

During operation, bearing moves forward along the arrow A direction, its speed extrusion speed control by squeeze note mouth 14 of going forward one by one.During the reach beginning, the feedhole of squeeze note mouth 14 is positioned at position shown in Fig. 4 A.Module 16A, 16B, 16C are usually also in position shown in Fig. 4 A.In each figure of Fig. 4 A to 4G, each module 16 has been put on " C " or " O " respectively.Sign " C " refers to that each module is that the mold pressing pipe closes up, and opens during the reversion of sign " O " finger print piece.

When module 16A, 16B, 16C advance to position shown in Fig. 4 B, the feed point 20 of squeeze note mouth 14 is located in upstream one end of up-stream module (first module) 16A.At this moment, module 16A stirs microswitch 17A, and module is unclamped, and decontrols the pipe of firm mold pressing.This pipe 26 is also soft, is being supported by second module 16B that closes up and the 3rd module 16C.A supporting plug 15 is preferably arranged, by stretching out one little section in the aperture on the squeeze note mouth 20 at least.This little intercept from, what form when being equivalent to or roughly being equivalent to module 16A, 16B, 16C reversion in the following manner is advisable apart from 26A, 26B, 26C.Module 16A throws off the balladeur train that advances, and gets back to position shown in Fig. 4 C.This return motion taking place, make module 16A not wait until that the no supporting part 26A of soft pipe bends the shape of hanging down or being pressed into and loses shape, just closes up again.Close up and to start by microswitch 19A.The length of backhaul 26A in each accompanying drawing of Fig. 4, shows quite obviously.For backhaul size in each accompanying drawing is just so demonstration of drawing easily.In fact greatly exaggerated, purpose is that stable situation forward can clearly be described.The distance of drawing back during each module reversion, compared with the width of ripple or rib on the pipe that is subjected to mold pressing, can be smaller.Like this, whenever, only have one section very short pipe and can not get supporting, or this part is only by plug 15 supportings.

When module 16A has arrived position shown in Fig. 4 C, close up subsequently to be position shown in Fig. 4 D, next module 16B is with regard to the similar segment distance of reversion, to support the pipe that shifts out from module 16A.Module 16B, 16C move, and in the similar mode of described module 16A situation of movement, are started by microswitch 17B, 17C and 19B, 19C.Like this, when module 16A is brought together into position shown in Fig. 4 D, module 16B just opens, throw off advance balladeur train and rapidly reversion to position shown in Fig. 4 E.

In order to reach purpose of the present invention, only used module 16A and 16B just, just be enough to make extrudate to be subjected to the supporting of two places all the time.Like this, as long as use module 16A and 16B, when module 16A opens and during reversion, extrudate can be by squeeze note mouth and module 16B supporting.

Though only use two modules good, consider minimum these two factors of support problem and moving-member, more appropriate possibly with three modules.Therefore, Fig. 4 F and Fig. 4 G have drawn module 16C with described module 16B(or module 16A) situation of movement of the similar mode of situation of movement.If desired, can also again use several modules certainly more.

Consider reversion apart from this problem of 26A, why important, not only because reversion when taking place pipe must not bend and hang down or distortion, more because corresponding those several modules must be drawn close the pipe of mold pressing again, just can make the ripple or the rib applying that have been shaped on its die face and the pipe.Like this, when module 16B reversion, will wrap the pipe of mold pressing.As however this stage mold pressing is lost shape, it will very accurately encase pipe, so, its chase and crest just can accurately be fitted with corresponding crest and chase on the pipe.Perhaps, this consideration really is most important, because can extruding a little hair defects at Guan Shangzai, comes module 16B, if section bar is too rare soft, and perhaps will this situation.When this section of 26B of pipe passed through in module 16C reversion, also may have similar problem.But, the meeting of this section of 26B have an opportunity to cool off hardening must be better than the situation of this section of 26A.

Though in Fig. 4 A to 4G, module 16A, 16B, 16C have been drawn as similar length, in fact, the first module 16A is than one section of the obvious weak point of the second module 16B probably.This schematic diagram of Fig. 5 has just showed this length situation relatively a little practically.The second module 16B among this figure can send some use fully, for example carries but facility of water cooling or air cooling.

Claims (16)

1, a kind of device of making special-shaped thermoplastic pipe, the mobile mold pressing road that comprises a mold pressing pipe in operating path, this mold pressing road comprises at least two modules, tubular die face of the fashionable formation of each module spliced, and can open to loosen the pipe of wherein mold pressing, in this device, each module can both be along a loop intermittently substep reversion in accordance with regulations, the longitudinal axis in this loop is adjacent with the longitudinal axis of operating path.

2, device as claimed in claim 1 is characterized in that comprising;

At least two modules, each module can piece together closure state forming a tubular die face, and can open from closure state, and each module can both move forward and backward along the axis of the tubular die face advance and retreat direction by the mold pressing road;

An elongated squeeze note mouth that has ring-type squeeze note hole inserts upstream one end along the mold pressing road that mould-pipe over glaze line moves, so that extrudate is squeezed in that module of upstream;

Make each module together along mould-pipe over glaze line, to accord with the device that the preceding line speed of mold pressing pipe moves forward in the mold pressing road;

Make each module towards the reversion of the direction opposite substep, and make and be in closure state when module moves ahead and be in the device of opening during reversion with preceding line direction;

Each module that makes above-mentioned reversion according to up-stream module prior to downstream and the successively device of reversion in abutting connection with the order of module.

3, device as claimed in claim 2 is characterized in that: the squeeze note hole is between the front end and rear end of up-stream module.

4, device as claimed in claim 3 is characterized in that: the downstream module that is shorter in length than adjacency of described up-stream module.

5, device as claimed in claim 2 is characterized in that: use three modules.

6, make the device of ring-type abnormity thermoplastic pipe, comprising:

, a longitudinal rail;

The bearing that moves before and after can be on guide rail;

Each bearing upper support a module, each module is all by becoming two half modules that laterally slidably reciprocate between closure state and open mode to form with the bearing moving direction on the own bearing, when closure state, two-half die pieces together a tubular die face of continuity that the longitudinal axis parallel with guide rail and bearing moving direction arranged; When opening, two-half die is separated from one another;

One has ring-type squeeze note hole, inserts upstream, mobile mold pressing road one end so that clamp-on the elongated squeeze note mouth of extrudate;

Two half modules slips of each module are the opening device of opening;

Two half modules slips of each module are the closing device of closure state;

The preceding line speed of mold pressing pipe moves forward one section preset distance in the mold pressing road to accord with to make each bearing, and moves this section preset distance backward, and makes two half modules be in the device that is in opening when closure state is then gone when moving ahead;

Start the device of each bearing successively in abutting connection with the order of bearing prior to the next one according to the upstream bearing.

7, device as claimed in claim 6 is characterized in that: a plug is supporting extrudate, and this supporting plug generally is to stretch out downstream to extend from the squeeze note hole.

8, as device as described in the claim 7, it is characterized in that: the length of that root supporting plug equals the backhaul distance of each module at least.

9, a kind of method of making special-shaped thermoplastic pipe, have following steps: by mold pressing pipe in a mold pressing road, this mold pressing road comprises under two each comfortable closure states and all forms the module of tubular die face, and can be opened into opening so that decontrol the pipe of wherein mold pressing at least; Advance along operating path when making each module closed, when individual module is opened according to well-regulated intermittence, along the adjacent loop reversion step by step of the axis of its longitudinal axis and operating path.

10, as method as described in the claim 9, it is characterized in that also comprising:

Make each module under the closure state that forms tubular mold pressing road die face, on operating path, move ahead together;

Have ring-type squeeze note hole, insert the squeeze note mouth of this upstream, mold pressing road one end by one, the extrudate squeeze note is gone in that module of upstream along tubular mold pressing road die face axis;

Open each module and they are respectively had off and on and return against the direction that moves ahead under opening, the reversion of each module is carried out prior to the order of adjacent downstream module successively according to up-stream module.

11, method as claimed in claim 10 is characterized in that: the squeeze note hole is between the front end and rear end of up-stream module.

12, method as claimed in claim 11 is characterized in that: up-stream module be shorter in length than the downstream module that is close to.

13, method as claimed in claim 10 is characterized in that: use three modules.

14, a kind of method of making ring-type abnormity thermoplastic pipe may further comprise the steps:

The thermoplastic parison, squeeze note goes into to comprise in the mobile mold pressing road of a longitudinal rail;

The bearing that can on this guide rail, move towards former and later two directions;

Each bearing upper support a module, each module is all by becoming the two halves module that laterally slidably reciprocates between closure state and opening to form with the bearing moving direction on the own bearing, when being in closure state, two half modules piece together its longitudinal axis continuity tubular die face parallel with guide rail and bearing moving direction; When being in opening, two half of moulds are separated from one another;

The preceding line speed of mold pressing pipe moves forward one section preset distance together in the mold pressing road to accord with to make each bearing, and this moment, each module all was in closure state, in this way, made the work of mold pressing road;

Open module one by one and each bearing is pulsed backward together with the module that is mated and be in opening, and module is just closed up before beginning to move forward;

The pulsation backward of each bearing is carried out prior to the order of adjacent downstream bearing successively according to the upstream bearing.

15, method as claimed in claim 14 is characterized in that: have a plug supporting extrudate, this supporting plug generally is to stretch out downstream to extend from the squeeze note hole.

16, method as claimed in claim 15, the length of described supporting plug equal the reversion distance of each module at least.

Images