WO1997044180A1

WO1997044180A1 - Device for the removal of hollow structures

Info

Publication number: WO1997044180A1
Application number: PCT/DE1997/000978
Authority: WO
Inventors: Franz Gittner; Uwe-Volker Roos
Original assignee: Bekum Maschinenfabriken Gmbh
Priority date: 1996-05-22
Filing date: 1997-05-15
Publication date: 1997-11-27
Also published as: DE19620639C1

Abstract

To produce a low-oscillation device which removes at high speed hollow structures deposited on carrier mandrels and produced bottom up in a plurality of manufacturing lines in blowing moulds containing, optionally, a plurality of cavities, and for the depositing of said hollow structures bottom first on a stationary or moving deposit plane, the invention proposes that pivotable removal and depositing arms (11, 11') are provided running in opposing directions from a removing position to a depositing position and are mounted with the drive means thereof in a slide (20) displacing them horizontally from a removing position behind a blowing mould (15) into the other removal position behind another blowing mould (15') and back again. Said slide is held in a frame (19) which can be raised and lowered vertically and lifts the hollow structures to be removed vertically from the carrier mandrels thereof, and deposits the removed hollow structures pivotable into the depositing position.

Description

Device for removing hollow bodies

The invention relates to a removal device for hollow bodies blown out in blow molds, usually with several cavities, after the blow molds have been opened, if the hollow bodies have been formed in a plurality of production lines lying next to one another. A machine of this type, in which, according to the so-called reheat process, sleeve-shaped or cartridge-shaped preforms are first heated to blowing temperature and, after having passed through one or more heating sections, are transferred to two, for example four, preforms alternately on two parallel production lines , on which they are advanced in cycles, introduced into blow molds and, after blowing out from the open mold, with the bottom upwards, are clocked further is described and illustrated, for example, in German patent application 195 29 969.8.

The two production lines 11 also result in two spatially separate dispensing lines.

In order to eliminate this expensive and complicated disadvantage, removal devices for finished hollow bodies which are blown into blow molds and which have to be placed on a delivery level, for example a conveyor belt, after opening of the blow molds are known, also for such blow molding systems which are equipped with at least one two blow molds working in parallel at a distance from one another and possibly containing a plurality of cavities, which after their completion place the hollow bodies on a common dispensing plane lying between them. For this purpose, for example, DE-A-23 18 315 proposes to install a receiving cooker below each blow mold, which consists of two halves in such a way that each blow mold half is assigned a cooker half and is connected to a blow mold half via handlebars. This connection is such that the left cooker half, for example, is connected to the right blow mold half and the corresponding right cooker half is connected to the left blow mold half. The consequence is that when the blow molds are moved together into the closed position, the cooker shafts move apart and hollow bodies present in the cooker can be placed downward on the dispensing level, while when the mold halves are moved apart into the opening steps 1 the cooker halves move together to form a closed cooker, so that hollow bodies previously blown out of the mold can fall into this closed cooker. The known device can only work if the blow molds are moved alternately from the blow position back and forth to a preform receiving station and the storage level is below the preform receiving station, in which the cookers open when the blow mold is closed around the preforms. In the case of such devices, it is also a prerequisite that the hollow bodies which have been blown out already leave the blow molds in the delivery position, ie with the bottom down.

In contrast, the machine concept for which the device according to the invention was designed is not only one in which the hollow bodies provided with a mouth leave the blow molds with the bottom facing upwards, but also one with very high output, ie it works with very short cycle times because the blow molds are not moved back and forth. This resulted in the following tasks for the present invention:

1. The hollow bodies produced in two spatially separated production lines are to be combined on a common delivery line;

2. Because of the very short cycle times in hollow body production, a high removal rate must also be used;

3. in spite of the high removal rate, the organs gripping and shutting off the hollow bodies have to work with little vibration;

4. the hollow bodies must be placed in a stable position, ie with the floor facing down, although they leave the blow molds with the floor facing up, 5. In order to ensure that the hollow bodies produced can be gripped and removed securely, removal members, for example pliers, must be brought to the hollow bodies in a region suitable for this purpose, and for this purpose a horizontal displacement of the removal tools must be possible;

6. In order to be able to lift the blown-out hollow bodies from their carrier mandrels, on which they are clocked into the blow molds and after they have been blown out, a vertical stroke of the removal tools must be possible.

The invention solves these problems with the means defined in the claims.

The invention is illustrated in an exemplary embodiment ^oh ne An¬ claim to be complete in the drawings and described below with reference to this. It represent

1 shows a schematic front view of the main parts of a device according to the invention on a reduced scale;

FIG. 2 shows a plan view of the two production lines of a hollow body production plant operating according to the reheat system on a scale which is further reduced compared to FIG. 1, to illustrate the field of application of the invention;

3 shows a diagram to show the angular rotation of the drive shaft of an input gear belonging to the device according to the invention in relation to the rotation of the drive shaft;

Fig. 4Λ successive Bewegungspha- ^s sen of the device according to the Erfin dung in the view of FIG. 1 in an opposite this further ver¬ kleinertem scale. According to the exemplary embodiment in FIG. 1, the device according to the invention consists of a stepping gearbox connected downstream of a motor 1 as input gearbox 2 with input shaft 3 and output shaft 4. A gearwheel 5 is attached to output shaft 4 of input gearbox 2 which drives a gear 6 of a stepping gear as a swivel gear 7 and a gear 6 'of a stepping gear as a swivel gear 7'. The gears 6 and 6 'are fastened to the drive shafts 8 and 8' of the swivel gears 7 and 7 ', respectively, which are on the same horizontal plane 9. Since the gearwheels 6 and 6 'are driven by the gearwheel 5 of the input gear 2, they are rotated in the same direction, but since the one swivel gear 7 is of the same type as the other welding gear 7 ¹ , but it is offset by 180 ° to one another ¬ sets are arranged, the removal and parking arms 11 and 11 ', which are attached to each end of the output shafts 10 and 10' and which are fastened so that they face each other, rotate in opposite directions.

The overall device is mounted in a frame 12, which completes the blowing system, generally designated 13, and is fastened, for example, to the machine frame 13 'of a blowing system according to patent application 195 29 969.8, which in two parallel production steps 1 and 4 with step by step moved chains 14, 14 'moved forward on preforms which, in the case shown, blow out four hollow bodies, for example bottles 16, in blow molds 15, 15'. In most cases, hollow bodies with a filling and emptying opening are produced in this way, and therefore cartridge-shaped or sleeve-shaped preforms Ingen are used which are attached to carrier mandrels during reheating and during inflation. The result is, that the finished hollow body 16 leave the blow molds 15 overhead, that is with the bottom up.

Since the preforms heated on a heating section are alternately transferred to one chain 14 and then the other chain 14 ', four preforms each in the illustrated example, four preforms are also alternately transferred, e.g. in the left-hand blow mold 15 in the drawing and then four preforms in the right-hand blow mold 15 'are blown out and are ready one after the other after the respective blow mold has been opened for removal with the device according to the invention.

In addition to the gear 5, a gear 17 is mounted on the drive shaft 4 of the input gear 2, which meshes with a rack 18 for a purpose described later.

According to FIG. 2, the device according to the invention also consists of a frame 19 which can be moved vertically up and down and in which a carriage 20 which can be moved back and forth is arranged. The horizontally movable carriage 20 carries both the input gear 2 with motor 1 and the two swivel gears 7 and 7 ', that is to say the unit according to FIG. 1. The vertically liftable and lowerable frame is driven separately, for example by B. hydraulically or pneumatically, while the horizontally displaceable carriage is moved by the input gear 2 by the gear 17 fastened on the output shaft thereof and which rotates on the fixed rack 18.

Both the linear, horizontal movements of the slide 20 and the pivoting movements of the receiving and Stellbstellarm 11, 11 'on the constructive curves of the stepper transmission can be predetermined by calculation.

The motor 1 can be reversed and the speed is variable, while the output shaft 4 of the input gear 2 generates both rotation phases and sti 11 stationary phases in accordance with the design of its movement curve.

How the rotation phases can relate to the standstill phases is explained using an example in FIG. 3, which shows the ratio of drive shaft 3 to output shaft 4 of the input transmission, the X-axis being the angles traversed by the drive shaft and the Y-axis which indicates the angle traversed by the output shaft. However, the diagram can only show one example, since the values determining the diagram curve are determined by the number of hollow bodies of a hollow body size removed at the same time, which in turn determine the size of the removal and shut-off arms and their cycle times.

According to the diagram according to FIG. 3, the input shaft 3 rotates from 0 ° to 19 ° in a first phase (1) without the drive shaft 4 being rotated; phase (1) is therefore a phase of standing.

In phase (1) following phase (1), input shaft 3 rotates from 19 ° to 91 °, while output shaft 4 is rotated by 60 °. As a result, the gearwheel 17 mounted on the output shaft displaces the horizontal one, the entire assembly according to Flg. 1 supporting carriage compared to the rack 1θ mounted on the vertically displaceable frame by a certain length, eg 60.8 mm. Phase (I) is therefore a rotation phase. In the following Sti 11 standing phase (2) the input shaft rotates from 91 ° to 129 ° without movement on the output.

Phase (2) is followed by phase (II), in which the input shaft rotates from 129 ° to 341 ° and at the same time the output shaft rotates by 120 °, so that the horizontally movable slide can be rotated further e.g. 121.5 mm in the vertically movable frame is shifted by rolling the gear on the toothed rack.

In the subsequent phase (3) the input shaft rotates from 341 ° to 379 ° (= 360 + 19) without any movement taking place at the output of the input gear.

in phase (III) the input shaft rotates from 379 ° to 451 ° (= 360 + 19 + 72), while the output shaft rotates by 60 ° and thereby the horizontally movable slide compared to the vertically movable frame by e.g. shifts another 60.8 mm.

In the subsequent phase (4) the input shaft rotates from 451 ° to 470 ° (= 360 + 19 + 72 + 19) without anything happening on the output.

The phases explained above with reference to the diagram in FIG. 2 act on the swivel gear 7, 7 as follows:

a) In the phases during which no movement is generated at the output 4 of the input gear 2 (phases (1) - (2) - (3) - (4)) nothing happens in terms of movement technology, even in the swivel gear system. However, the time spent for phases (1) - (2) - (3) - (4) is not useless, but rather is used for the processes explained below. For example, the time that corresponds to the angle on the input shaft 3 of the input gear 2 from 451 ° to 470 ° to 19 ° (phases (4) + (1)) is used to reverse the drive motor 1 in the opposite direction of rotation , and the time which corresponds to the angle at the input gear on the input shaft from 19 ° to 0 ° to -451 ° for the motor to be reversed again.

b) In the phases during which the input shaft of the input gearbox rotates from 19 ° to 91 ° (I) and from 379 ° to 451 ° (III) and at the same time the output shaft rotates by 60 ° in each case Input shafts of the slewing gearbox produce a rotary movement, but due to the construction of the inside step curve, no movement during the output. The result is that only the horizontal slide 20 moves in these phases without rotation of the removal and parking arms 11, 11 '.

c) In phase (II), during which the input shaft of the input gear rotates from 129 ° to 341 ° or on the return trip from 341 ° to 129 ° and the drive shaft carries out a pivoting movement of 120 ° Output 10 of the swivel gear rotated, whereby the removal and parking arms are pivoted in opposite directions by 180 °.

With regard to the arms with which the hollow bodies are gripped and put down, the gears have the following effects, which are explained with reference to FIG. 4: A. When the angles on the input shaft 3 of the input transmission 2 pass through from 341 ° to 379 ° (phase (3)), the long leg of the arm 11 provided for gripping the hollow body is located with its grippers in a horizontal position , and likewise the other arm 11 'intended for parking the already removed hollow bodies (FIG. 4A). The arms 11, 11 'are designed as angles, so that only the short, driven legs are visible in FIGS. 4A to 4D and 4F to 41, while the long legs equipped with grippers are only visible in FIG. 4E and 4J are visible. The entire system is at rest. 4B after driving through phase (III) - angle 379 ° to 451 ° - the necks of the bottles 16, while the Release the gripper in the arm 11 'below. When the angles on the input shaft 3 pass through from 451 ° to 470 ° to 19 °, the motor is switched over as shown in FIG. 4C and the drive for the frame which can be raised and lowered vertically, for example a pneumatic or hydraulic motor, has time for this Slide frame up. As a result of this displacement of the frame 19, the gripped bottles 16 are lifted off the thorns carrying them on the chain.

B. During the now backward phase (III), in which the drive shaft of the input gear rotates an angle of 19 ° back over 451 ° to 379 °, the long legs of the gripping arms remain in a horizontal position, while the horizontal is closed it should be moved 20 to the left by 60.8 mm in the drawing (Fig. 4D). C. In phase (3), in which the drive shaft 3 rotates an angle from 379 ° to 341 °, nothing happens to the movement system (FIG. 4D). However, this position is passed without stopping the drive system.

D. If in the following phase (II) the input shaft 3 of the input gear 2 rotates an angle of 341 ° to 129 ° and the output shaft 4 is rotated by 120 °, the gear ratios 5/6 and 6 '(wheel on shaft 10 , 10 ') the arms 11, 11' are pivoted in opposite directions by 180 ° and at the same time the horizontal slide moves around, for example 121.5 mm further to the left. 4E shows a position in which one arm 11 - in the drawing on the right - with tapped hollow bodies has been bent by 90 ° and the other - in the drawing on the left - arm

11 ', which had previously turned off the hollow body, by 90 ° in the opposite direction. The arms then pivot further into the position according to FIG. 4F, in which the bottles 16 are placed. 4F, the carriage movement of this phase has ended and also the pivoting movement of the removal and parking arms 11, 11 '.

E. In phase (2), in which the input shaft of the input gearbox rotates an angle of 129 ° to 91 °, nothing happens to the system. The time is used for queries on the control side, for example to query whether the blow mold chains 14 or 14 ', on which the hollow bodies to be removed are seated on thorns, are in a removable position.

In phase (I), in which the drive shaft of the input gearbox rotates an angle of 91 ° to 19 °, the long legs of the arms with their gripping tools remain in a horizontal position according to FIGS. 4F and 4G, while the Horizonta 1 closes i tten to the left by another 60.8 mm and e.g. - not shown - spring loaded pliers on the left arm 11 'around suitable locations of the hollow body, e.g. Bottle necks, place and grab them.

While the input transmission input shaft travels an angle of 19 ° over 0 ° / 470 ° to 451 ° (phases 1 and 4), nothing happens in the system and the time is used to reverse the polarity of the motor, to carry out queries and to move the vertically movable slide upwards for lifting the bottles 16 'off their carrier mandrels.

From then on, the same process takes place in the opposite direction (to the right in the drawing). Fig. 4F shows the position after the pivoting of the gripping arms 11, 11 'such that the upper arm 11' is in the waiting position for clipping the bottles out of the machine side U, while the lower arm is ready to strip off the bottles on the machine side V or to be delivered to a unit not mentioned in the patent. The center line of the lower bottles coincides with the center line CL of the machine.

4G, the grippers on the long leg of the arm 11A have gripped the bottles on the machine side U while the bottles have been clipped out of the lower arm 11. Thereafter, according to FIG. Tika 1 slid on and the bottles are lifted from the carrier mandrels on the machine side U. The lower bottles can fall off and / or be transported away. Thereafter, the unit moves horizontally according to FIG. 41 without swiveling the arms back into the waiting position, which, however, is passed over in this direction without stopping. Thereafter, the arms pivot according to FIG. 4J by 180 °, but also in this figure the position after a pivoting by 90 ° is shown. The slide is moved vertically downwards during the swiveling. FIG. 4K is identical to FIG. 4A, ie the process is repeated.

The process is such that e.g. according to the sequence of figures 4Λ / 4B, the drive motor is left-turning. 4C, the motor is reversed in the direction of rotation, i.e. in the sequence of figures 4C to 4G, the drive motor rotates to the right. In the position according to FIG. 4M, the motor is reversed again in the direction of rotation, i.e. in the sequence of figures 4H to 4B (over 4J / 4A) the drive motor rotates to the left. In the transition from 4A to 4B, control technology can be queried whether the chain 14 'on the machine side V and in the transition from 4F to 4G can be queried whether the chain 14 on the machine side U is in position.

It goes without saying that many modifications are conceivable within the scope of the invention. For example, for the removal of blown hollow bodies from more than two production lines, at least one swivel gear 7 or 7 'on both sides of the drive shaft 10 or 10' could have a removal or have a parking arm 11 or 11 ', which would then however not be placed on the same level as the arms shown. Likewise, instead of the shifting device consisting of the gear 17 and the toothed rack 18, a chain drive could be provided for the slide 20, the driving chain wheel being mounted on the output shaft 4 of the input transmission instead of the gear 17. The gripping tongs 16a could also be replaced by other gripping means, for example by suction cups connected to a vacuum shaft.

Claims

Patent claims

1. Device for the removal of blow molds which are produced overhead in several production lines (U, V), possibly containing several cavities, on hollow mandrels and for parking with the floor ahead on an immobile or moving stand, e.g. A conveyor belt, characterized in that removal and storage arms (11, 11 ') which are pivotable in opposite directions from a removal position into a storage position and are provided with their drive means in a position horizontally from a removal position behind a blow mold ( 15) are mounted in the other removal position behind a blow mold (15 ') and slide (20) which moves back, which is received in a vertically liftable and retractable frame (19) which holds the hollow bodies (16, 16 ') lifts off its carrier mandrels and the removed hollow bodies pivoted into the storage position are 1 t.

2. Device according to claim 1, characterized by a control of the drive of the slide (20), which gradually shifts it horizontally from one to the opposite decrease position and back, while in the pauses between the shifts for driven frame (19) is raised and lowered.

3. Device according to claims 1 and 2, characterized in that the removal and Λbstellarme (11,11 ') are angular or T-shaped and the removal tools (16a) on a long leg of the removal and Ab¬ stel 1 arms 1 iegen.

4. Device according to claims 1 to 3, characterized in that in the verti¬ cal lifting and lowering frame (19) with respect to this horizontally back and forth Schlit¬ ten (20) is arranged, the one from one by one Motor (1) operated input gear (2) with input shaft (3) and output shaft (4) and two parallel swivel gears (7, 7 ') each with an input shaft (8) and output shaft (10) carries existing unit, the Ab¬ Drive shaft (4) of the input gear (2) with both drive shafts (8) of the swivel gear (7) via rotation-transmitting means, for example Gear wheels (5/6, 6 ') is connected and also carries a gear wheel (17) which meshes with a toothed rack (18) fixedly arranged in the frame (19) and the arms (gripping and repositioning the hollow bodies produced) ( 11, 11 ') through the output shaft (10, 10') of the swivel gear (7,7 ') can be pivoted into the take-off and position 1 position.

5. Device according to claims 1 to 4, characterized in that the central axes of the drive shaft (10, 10 ') of the swivel gear (7, 7') on a horizontal plane (9) 1 i egen.

6. Device according to claims 1 to 5, characterized in that on the drive shaft (10, 10 ') of each swivel gear (7, 7') a swivel arm (11, 11 ') is fastened and the swivel arms are facing each other, but can be pivoted in the opposite direction.

7. The device according to claim 6, characterized g e ¬ k e n n z e i c h n e t that on both ends of the Λbtriebswel le (10,10 ') at least one Schwenk¬ gear (7,7') each has a pivot arm is attached.

8. The device according to claim 3, characterized ¬ characterized by controlling the ratio of the continuous rotation of the input shaft (3) to the rotation of the output shaft (4) of the input gear (2), after each of a standstill phase ( (1) - (2) - (3) and (4)) of the output shaft (4) a rotation phase ((I) - (II) and (III)) of the output shaft follows.

9. The device according to claim 8, characterized in that the angles passed through by the output shaft (4) of the input gear (2) in phases ((I) and (III)) are the same.

10. The device according to claim 8, characterized ge ¬ indicates that the driven by the output shaft (4) of the input gear (2) angle in phase (II) equal to the angles of the phases (I) plus (III) Is.

11. The device according to one or more of claims 1 to 10, characterized in that the centers of the gripping tools (11a) of the removal and parking arms (11, 11 ') at the time when a hollow body (16) is parked or dropped the plane passing through the central plane (CL) of the machine (13) producing the hollow bodies in the blow molds (15) correspond.