MXPA97009482A - Weight load station for molding overheating machines by sopl - Google Patents

Abstract

The present invention relates to a shape loading station for blow molding reheating machines with the help of sleeve-like or cartridge-like shapes taken from a supply with their bottom pointing downwards, placed on mandrels for transporting means of transport. transporting continuously and cyclically moving, for example, a chain which guides such shapes on the mandrels with the bottoms facing upwards through at least one heating path from where they are removed after a sufficient molding temperature has been reached , and are introduced at least to a blow mold, with the transport means driven by a stepgear system to produce phases in motion and at rest, characterized in that the station comprises an inversion wheel with a horizontal axis, the wheel of investment continuously by rotating the forms from a "down" position to a position " upwards ", as well as a cyclically rotating load wheel, which takes the shapes in the inversion wheel and has a vertical axis and from which the forms are placed or attached to the transport mandrels through a compression system, the joining operation being carried out in a resting phase of the means of transportation to a simultaneous rest of the load wheel and the driving of the charging station being connected to the driving arrow that rotates permanently of the stepgear of the means of transportation of the reheating machine

Description

WEIGHT LOAD STATION FOR BLOW MOLDING OVERHEATING MACHINES DESCRIPTION OF THE INVENTION With respect to the production of hollow bodies made of a plastic material, according to the so-called blow molding process, wherein a shape is introduced into a blow mold having a mold cavity determining the size and shape of the finished hollow body and is blown in the closed mold by introducing a pressure medium in the preform, that is, it is compressed with its external wall against the wall of the cavity and is thus configured, the distinction is made between three main groups of methods, mainly the blow molding method of the extrusion type, the blow molding method of the injection type and the reheating method. In a broader sense, the invention relates to an overheating method wherein cartridge or sleeve type shapes are injection molded to have a supply thereof, and are taken from the supply in a cooled state and are guided through of a heating path, while rotating around its axis, in the heating path, are again heated to the correct blow molding temperature, most of the time, in a plurality of heating sections which are interrupted by intermediate cooling sections in order to be introduced to a conventional blow mold after leaving the heating path. In a narrower sense, the present invention relates to a form loading station for reheat blow molding machines. In such machines, the shapes are guided on means of transportation, most often a chain, through the intermediate heating and cooling stations. Up to this point, the shapes are placed with their openings facing downwards on the transport mandrels mounted on the chains to keep away the heat supplied, which normally arises upwards, from the neck portion or opening, which is maintained in a cold state and usually is provided with a thread. The forms must be placed on their transport or support mandrels in a very exact way, since they must turn in a free form of stirring on the mandrels to obtain a unique heating in the heating path, and the difficulties that can lead to the Waste can arise in the case of shapes that are not placed in an exactly vertical position when they are introduced to the blow mold, and, especially when the forms are pushed on the transport mandrels, and the perforated portions leading to the mold must be avoided. Spill when the finished and blown hollow body closes. In cases where, in a reheat facility, the blow mold is not located at the end of a heating path or the conveying unit that drives the shapes through the heating path, but the shapes are loaded from the Warm path to a separate blow path can be excipient and the transfer should be made easier when the shapes run through the heating path without a continuous shape, but move cyclically through it, with a cycle, that is, a phase of transportation and a phase at rest, being, for example, approximately 0.2 seconds for each one. The transfer of the heating path to the blow path then occurs in a phase at rest, between the cycles, although this phase is short. Such an overheating facility, in which a heating path can alternatively serve two blow molding paths, is, for example, as described and illustrated in German patent application 195 29 969 9-16. A plurality of forms, in the illustrated example, four forms in each case are discharged in a resting phase of the heating path from the path to a blow molding path. Such a system is an example of the use of the shape charging station according to the invention. In the present invention, the feeding of the shapes is derived from the activation of the stepped gear, which defines the sequence of movement in the heating path and the transfer area towards the blow molding path of the reheating machine or system of blow molding. This is achieved because the forms are continuously rotated about 180 ° from the so-called "clock position at 12 o'clock" (with the opening facing upwards) in the so-called "position at 6 o'clock" (with the opening looking down), that the shapes are fed into two compartments of an inversion wheel through a friction band under a driving force and the shapes are introduced into the compartments of the inversion wheel through curved metal sheets suitable mounted on the circumference, for example, in twelve sections, and successive forms are retained, respectively, the forms are transferred to the load wheel when the latter is at rest, just as the union of the forms on their transport mandrels, which are also carried out in a resting phase of the heating path transportation system. The invention will now be explained with reference to one embodiment and the drawings in which: Figure 1 shows schematically the supply of the shapes with their necks or openings facing upwards, on a reduced scale; Figure 2 schematically shows the drive system of the entire charging station according to the invention, on a reduced scale also; Figures 3A to 3C show the system for introducing the shapes in the compartments of an inversion wheel belonging to the apparatus of the invention in successive phases; Figure 4 shows how the shapes are supplied from a sorting device to the reversing wheel according to one mode, on a slightly reduced scale; Figure 5 shows the compression system and the drive thereof according to an embodiment of the scale of Figure 4; Figure 6 shows the transfer of an inversion wheel to a loading wheel according to one embodiment, on a scale of Figures 4 and 5; According to Figure 1, the forms 1, 1 ', 1"... are supplied in a manner known per se via an ascending band with barite 2 of a storage tank 3 via a roll type sorting system 4. with their necks 5 pointing upwards in a suspended form, ie, with their openings facing upwards, towards the shape loading station .. In an extreme portion of the sorting system of roller 4, forms 1, 1 ' , 1"... are propelled forward towards the feed unit through a friction band 6 acting on the neck or opening 5 on one side, and are thus driven predominantly against an inversion wheel 7 which rotates around a horizontal axis 13. When production is stopped in the appropriate blow molding system, the additional supply of shapes is interrupted through a cylinder stopping system 8, which during normal operation is in a Also, care must be taken in particular when the system is activated so that the forms are transported to the reversing wheel 7 at the exact moment with respect to the compartments of form 9 (Figure 3). However, since the forms can be placed with their necks facing down on the transport mandrels, which are mounted on means of transportation, most of the time a chain 11, and move the forms cylindrically through the trajectory of heating 10, first they must be rotated about 180 °, so that the opening of the neck 5 is in a position at 6 o'clock when the position of the roller-type sorting system 4 towards the inversion wheel 7 with the compartments of form 9, they are designated as a position at 12 o'clock. This 180 ° rotation is obtained by continuously rotating the reversing wheel 7, and a form 1, 1 ', 1"... is rotated downwards from the 12-hour position, for example, after 30 °, each one from the shape compartments 9 arranged every 30 °, in the so-called 6-hour position with the neck of form 5, and then transferred to a load wheel 1 5 which will be described later, which moves cyclically about a vertical axis 14 and which cyclically pivots the shapes 1, 1 ', 1"... on the transport mandrels 12 of the heating path chain 11 moving cyclically through the heating path 10 to compress the forms at that point on the transport mandrels 12 through a compression system 16, which will also be described later. The reversing wheel 7 is a wheel equipped with compartments 9, for example, with twelve compartments for a respective shape, the compartments being defined by curved metal sheets 9a, which are formed in a manner similar to plowshares such that push the form 1 towards a compartment and its front edge 9a 'in a rotational direction (Figure 3B), while simultaneously locking the insertion of the subsequent form 1 * towards the same compartment and its trailing edge 9a "and direct the subsequent form The reference number 1 7 designates the drive system of the heating path chain 11 of the reheat machine, which also controls the transfer of the heated forms of the reheat machine to a plurality of trajectories. of blowing 19, the reference number 18 (Figure 2) designates the adaptation gear 18 of the gear ratio 1: 1 for the supply unit. According to Figure 2, the gears 21 of 90 ° of the gear ratio 1: 1 are coupled through arrows 20, 20 'to the adaptation gear 18 in order to drive the straight arrow 22.

A brake / coupling combination 23 is mounted on the upper end of the arrow 22, the combination being necessary to satisfy the safety requirements of relevant provisions and for possible cases of failure. The coupling within the brake / coupling combination 23 has a coupling point for a respective rotation, for example, a spring-loaded ball, which engages in a depression. With the help of the brake within the brake / coupling combination, the extension 22 'of the arrow 22, which, being separated from it, is connected through the brake / coupling system to the latter, will be retained on a start again until the coupling reaches its coupling point again. The brake / coupling combination 23, for example, is of a pneumatic type, is verified through sensors and can be decoupled on purpose in the case of failure. Above the brake / coupling combination 23, the arrow extension 22 'passes to a triaxial angular gear 23 with the following functions: - date of entry 26 identical to the arrow extension mentioned above, - arrow 27 with a ratio of 1: 1 gear based on the input arrow 26, - arrow 28 with a gear reduction ratio of 1: 6 based on the input arrow 26. The arrow 28 drives the reversing wheel 7, which rotates around of a horizontal axis 1 3, through a reduction gear 29, for example, a reduction of toothed belt or sprocket gear of a 1: 2 type, while the arrow 27 drives a toothed belt gear or of gear wheel 30 of a type 1: 1, which acts on a drive shaft that passes on both sides through a stepped gear 31 with its arrow ends 32 and 32 '. Therefore, it is also evident that the toothed belt or sprocket type reduction gear 29, toothed belt or sprocket gear 30 and also the arrow ends 32, 32 'rotate continuously. The compression system 16, which will be described in more detail below, is mounted on the arrow end 32 '. As follows, from the aforementioned gear ratios of the adaptation gear 18 for the 1: 1 feed unit, the gears 21 of 90 ° of 1: 2, the arrow 28 of 1: 6 and the reduction of gear of toothed belt or gear wheel 29 of 1: 2, the reversing wheel 7 performs a movement of 1/12 on its horizontally placed arrow, with the axis 13 after a rotation of the arrow 20, while the arrows 32, 32 'perform a complete rotation due to the gear ratio of 1: 1 on the arrow 27 and the toothed belt or gear wheel gear 30 with a gear ratio of 1: 1. At a right angle to the continuous arrow 32, 32a in the stepped gear 31, the operating arrow 33 is located on the axis 14 of the load wheel. The stepped gear 31 is composed as a generally known and normal, commercially available globoid curve drive, such that full rotation of the arrow 32, 32 'produces a 45 ° rotation of the operation arrow 33 plus a phase in rest caused by the geometry of the curve. The stepped gear 31 is integrated in the system in such a way that the operating arrow 33 is oriented vertically downwards and has mounted on it the load wheel 15 configured in the form of a ring gear, which with the division of The aforementioned 45 ° cycle carries spring loaded pairs of tongues 34, which are capable of supporting the shapes in a frictional manner. These tabs are compressed therein to the forms 1 which rotate through the reversing wheel 7 at about 180 °, in the so-called 6-hour position on the load wheel 15, corresponding at that point, with the pairs of 34 loaded spring loaded tabs, via the guide plates generally designated with the number 35, such plates are optimized with respect to the technical sequence and are fixedly maintained in the system and do not take part in the rotational movements, since they are pivoted cyclically 45 ° on the transporting mandrels 12 for later being compressed by the compression system 16 on the transport mandrels 12, with the compression system 16 being mounted on the arrow 32 'continuously in rotation. The stepped gear 31 is adapted to the drive system 1 7 of the heating path chain 11 of the blow molding reheating machine in such a way that when the chain 11, which also carries the transport mandrels 12, is in a At rest phase, the load wheel 15 is also in a resting phase, but in such a way that when the chain 11 starts a new cycle, the cycle times of the load wheel 15 are delayed to such an extent that the , which are seated on the transport mandrels 12, can be released from the pairs of spring loaded tongues 34. As already described above, the stepped gear 31 has a continuously rotating drive shaft 32, 32 ', which passes through the transmission, with the toothed belt gear 30, for example, acting on the side of the arrow 32, while an eccentric disc 36 with a cam roller is seated on the side of the arrow 32 ', the eccentric disc 36 urging a slide 38, which can be moved up and down vertically, in particular through a link mechanism 37 (Figure 5). The "Compression system 16" represents a unit installed in a fixed manner, which carries the slidable slide 38 with the integrated link mechanism 37, including the eccentric disc 36 secured to the arrow 32 ', as well as a plunger 39 mounted on the slider 38. The slide 38 can, for example, perform a total elevation of 50 mm thanks to the geometrical design of the eccentric disc 36 and the link 37. Since the heating path chain 11 with the installed transport mandrels 12 and the wheel 15 are in a resting phase, the slide 38, controlled by the eccentric disc 36 in combination with the link mechanism 37, performs a vertical lift of 25 mm from its center of elevation upwards to the point of inversion below and then again a 25 mm lift from its point of inversion towards the center of elevation. A form 1 is compressed on the transport mandrel 12 through the piston 39 secured to the slide 38 through a pair of spring loaded tongues 34, which are placed above the transport mandrel 12 at each moment. Since subsequently the heating path chain 1 1 and the load wheel 15 cyclically move in a way that coincides with the time already described, the slide 38 moves from its center of elevation 25 mm upwards to the point of inversion upper and then back to the lifting center, where it arrives after a stop of renewal of the heating path chain 11 and the load wheel 15. Thanks to the procedure described above, the plunger 39 is no longer a factor of disorder during the linear removal of the forms 1 of the pairs of tongues 34 loaded by spring, since it has been moved vertically upwards to a sufficient degree.

Claims (11)

REVIVAL NAME IS

1 . A shape loading station for blow molding reheating machines with the help of sleeve or cartridge type shapes taken from a supply with their bottom pointing downwards, are placed on mandrels for transportation of continuous transportation means and cyclically moving , for example, a chain which guides such shapes on the mandrels with the bottoms facing upwards through at least one heating path from where they are removed after a sufficient molding temperature has been reached, and are introduced by at least to a blow mold, with the means of transportation driven by a stepped gear system to produce phases in motion and at rest, characterized in that the station comprises an inversion wheel with a horizontal axis, the reversing wheel continuously making rotate the shapes from a "down" position to an "up" position, as well as a It is a cyclically rotating load, which takes the shapes in the inversion wheel and has a vertical axis and from which the forms are placed or attached to the transport mandrels through a compression system, the union operation being carried out in a resting phase of the means of transportation to a simultaneous rest of the load wheel and the drive of the charging station being connected to the driving arrow that rotates permanently of the step gear of the means of transportation of the machine overheating.

2. The charging station, according to claim 1, characterized in that the stepped gear of the transport means is connected to the drive of the charging station through an adaptation gear and a 90 ° gear, which through of a vertical arrow drives a triaxial angular gear, which drives the reversing wheel and an arrow through an arrow extending to a right angle of the arrow and through gear reduction means, as well as a stepped gear through of a gear, through which the stepped gear of the load wheel is driven at a right angle to the arrow.

3. The charging station, according to claims 1 and 2, characterized in that the stepped gear comprises a continuous arrow at a right angle to the arrow of the load wheel, one end of the arrow driving a member, for example, a wheel toothed or a bandwheel, of the gear reduction means and the opposite end of the shaft driving a shape compression system.

4. The charging station, according to claims 1 to 3, characterized in that the arrow of the angular gear rotates at the same rotational speed as the input arrow, while the arrow rotates at a rotational speed lower than the input arrow, and that the connection between the angular gear and the reversing wheel is through gear reduction means, which, in contrast, is a gear ratio (1: 1) between the angular gear and the load wheel.

5. The charging station, according to claims 1 to 4, characterized in that the complete rotation of the continuous arrow of the stepped gear produces a substantially smaller angular rotation of the load wheel arrow, including an additional rest phase.

6. The loading station, according to claims 1 to 5, characterized in that the load wheel bears pairs of tongues, which frictionally maintain the shapes at equal distances and in which the shapes that are supported by the reversing wheel and have rotated from the "bottom to bottom" position to the "bottom to top" position are compressed and pivoted in a successive order on the transport mandrels.

7. The charging station, according to claims 1 to 6, characterized in that the compression system mounted on one end of the continuous arrow of the stepped gear comprises a plunger, which cyclically compresses the shapes on the transport mandrels.

8. The charging station, according to claims 1 to 7, characterized in that the compression system consists of an eccentric disc with a cam roller, the eccentric disc being driven by the drive shaft of the step gear and driving a slide that is it can raise and lower through a link mechanism, the slide carrying the plunger, which compresses the shapes on the transport mandrels.

9. The charging station, according to claim 8, characterized in that the eccentric disk and the linking mechanism are geometrically designed so that the slide performs a vertical lift downwards from the center of elevation and, during that time, compresses a shape on the plunger transport mandrel through a pair of tabs placed above a transport mandrel, whereby the slider moves the same distance upwards from the center of elevation and also beyond the center of elevation to a equal distance upwards, to the upper reversal point and then back to the center of elevation and arrives at a time at which the means of transportation and the load wheel are in their resting phase.

10. The charging station, according to claims 1 to 9, characterized in that through a coupling of the gear wheel with the drive system of the means of transportation, and at each beginning of a phase of movement of the means of transportation , the start of the rotation phase of the load wheel is delayed by such amount that a shape, which is seated in the transport mandrel, can be released from the pairs of tongues. eleven . The charging station, according to claim 1, characterized in that the reverse wheel is equipped with compartments for a respective shape, the compartments being defined by curved metal sheets, which are configured as plowshares in such a way as to push a It forms towards a compartment with its front edge in the rotational direction of the wheel, simultaneously blocking with the aid of its rear edge the insertion of a successive form in the same compartment and guiding the successive form towards the subsequent compartment. RESU M IN OF THE I NVENTION The present invention relates to a shape loading station for blow molding reheating machines. Such machines have the problem that cold forms of the sleeve type or cartridge type, which are produced as a supply unit, have to move from the "bottom to bottom" feed position to the "joint" bottom up ", before being moved through a heating path over the transport mandrels of the transportation means, where they are heated to the correct blow molding temperature. Such movement is carried out through an inversion wheel (7), which rotates the forms about 1 80 ° and transfers them to a load wheel (15), from which they are compressed on the transport mandrels (12) This is achieved according to the invention, since the loading station comprises an inverting wheel (7) continuously in rotation with a horizontal axis (13) and a load wheel (1 5) cyclically in rotation, which removes the forms of the reversing wheel and has a vertical axis (14) and from which the forms are placed or attached to the transport mandrels (12) through a compression system (16), the joining operation performed in a rest phase of the conveying means of the reheating machine to a simultaneous rest of the load wheel and the drive of the charging station being connected to the drive shaft permanently in rotation of the drive system (1 7) of the means of transportation of the reheating machine. (Figure 2).