DK152569B - APPLIANCES FOR MANUFACTURING PLASTROS WITH TWO GRILLS - Google Patents

Description

in

DK 152569 B

The invention relates to an apparatus of the type specified in the preamble of claim 1.

Such apparatus for producing plastic tubes with cross grooves are e.g. known from DE Publication No. 5 20 61 027. Plastic pipes manufactured on these apparatus and provided with transverse grooves are used to a considerable extent as electro-protective pipes, ie as protective pipes for cables. This is especially true for pipes with a small diameter of approx. 10 to 100 mm. However, such tubes having a much larger diameter, e.g. up to approx. 600 mm and used, e.g. as drainage pipes. In order to be able to produce tubes of different diameters, the mold parts must be interchangeable, which of course cannot be used on one and the same apparatus mold molds having 15 moldings for pipes with a diameter of both 10 mm and 600 mm. However, considerable efforts are being made to cover this large diameter range with as few appliances as possible. The performance of an apparatus is determined by the extruder which, in accordance with its construction, can extrude a specified amount of plastic per time unit in plasticized state. If a tube of such a small diameter - and a correspondingly small wall thickness - is produced on such an apparatus, the rate of production is higher than if a larger diameter tube was produced and, if applicable, a larger wall thickness. At high production rates, correspondingly higher identical rates for the mold forms are correspondingly large mass accelerations at their redirect points than at lower production rates. Since the external dimensions of the mold mold parts must be identical for a given apparatus, it is desirable to make the weight of mold mold moldings having molds located in the lower diameter region particularly light. In addition, a number of cooling and vacuum ducts are provided in the mold molds which are 2

DK 152569B

open towards the machine table. The greater the distance between the mold cavity and the machine table, the more expensive is the fabrication of these channels. Finally, by vacuum deformation of the hot plastic extruded from the extruder from the extruder, the extruder spray head is placed at a distance from the mold so that the hot plastic tube runs freely into the mold, ie. thus slightly dependent and, if appropriate, lateral.

10

The object of the invention is to provide an apparatus of the kind mentioned above, which is arranged so that inlet errors of the hot-plastic hose in the mold can be compensated even while the apparatus is in operation, while at the same time allowing for optimal placement of various diameters of various diameters in the mold parts.

This is achieved according to the invention by means of the features of claim 1. Due to the fact that the height and side adjustment of the machine table can be made in the vicinity of the spray head and on one side of the machine table, one operator can accurately monitor the extruded hose extruded out of the spray head during the setting process.

25

Requirements 2-4 specify specific simple steps for setting the machine table side.

Claim 5 specifies a simple control clutch for all height settings1 in 1 drive.

Claims 6 and 7 contain, in a particularly simple manner, possible placement of the pomegranates with different diameters in the molds by means of the invention.

DK 152569B

measures.

Further features and advantages of the invention are described below with reference to the drawing, in which: FIG. 1 shows a vertical section through an apparatus according to the invention, corresponding to section line I-I in FIG. 2, and FIG. 2 is a part of the apparatus of FIG. 1, viewed from above.

On top of a machine stand iv, a machine plate or a machine table 2, respectively, is slidably mounted in the production direction 3. In addition, groove gear wheels 4 are provided which are supported by a fixed spacing in the lateral spacing of a shaft 5. These groove gear wheels 4 lies with their running surfaces on top of the machine table 2 and is supported precisely in the lateral direction by means of their track rim 7 against corresponding guide surfaces 8. The shaft 5 15 is mounted in bearing blocks 10 in such a way that it can be set longitudinally 9, horizontal and perpendicular to the production direction 3, and height adjusted perpendicular to the production direction 3 and perpendicular to the longitudinal direction of the shaft 5. The bearing blocks 10 are arranged on the machine table 2 and extend downwardly therefrom. In the bearing blocks 10, recesses 12 are formed which extend in the height adjustment direction 11, and in which there are arranged bearing elements 13, 13 ', in which the shaft 5 is also rotatably mounted. Inside the bearing body 13, as in FIG. 1 is shown on the right, the shaft 5 is axially displaceable by means of a normal slide bearing, while in the second left in FIG. 1, the bearing body 13 'is axially adjustable, but also fixedly attached. For this, the shaft 5 within the area of this bearing body 13 'has an external thread thread 14 which is guided in a corresponding thread within the bearing body 13. A lateral adjustment of the machine table 2 relative to the machine frame 1 in a direction 9 takes place by turning 4.

DK 152569B

shaft 5 relative to bearing bodies 13, 13 '. To this end, on the end of the outer thread 14 located near the outer thread 14, which protrudes outside the associated groove gear wheel, is provided a 6-edged shoulder 15 on which can be mounted 5 a correspondingly suitable 6-edged key. In order to avoid an accidental self-adjustment, a cover 16, which is located on the underside of the machine table 2 and adjacent to the groove wheels 7, is fitted with a securing bracket 17 which, due to its own weight, fits formally over the shoulder 10 15. within its upper region, it is pivotally mounted in a bearing 18, and in addition, it is secured by a ball bearing lock 18a.

Said height adjustment of the machine plate 2 in the direction 11 takes place by means of lifting spindles 19, 19?, Which are u-15 slidably mounted in the axial direction, ie in the direction 11 in the bearing blocks 10. They each have an external thread 20 which is engaged with a corresponding thread in the prismatic bearing bodies 13, 13 ', so that, when turning the lifting spindles 19, 19', they are displaced in the recesses 12 in the bearing bracket 10. The lifting spindles 19, 19 'are provided with sprockets 21 over which there are led an endless gear chain 22.

The lifting spindle 19 'gripping into the bearing body 13' projects through the machine table 2 and above it and is here provided with a 6-edge guide 23 so that an adjustment 25 can be carried out by means of a 6-edge attachment key. As can be seen from the above described, the two 6-edge guides 15 and 26 are located adjacent to each other, so that both the side adjustment and the height adjustment can be performed by an operator from one and the same location. A fuse against a self-adjustment is not required, as the resistance of the chain drive and also the self-inhibiting effect of the spindle drive preclude a self-adjustment.

On the upper side of the machine table, casting mold portions 24 and 24 ', respectively, which are separately connected to 5

DK 152569B

each other to form two so-called chains 25 and 25 ', respectively. To this end, on each outer mold part within the region of the outer edge located in the direction of production 3, there is provided a latch 27 which is fastened by means of a connecting bolt 26 and which at the corresponding place on the subsequent mold mold part 24 and 24 'also are connected by means of a connecting bolt 26. The chain 25 and 25 'thus provided, respectively, are guided at their rear ends, as seen in the production direction 3, around rotary wheels which serve as so-called inlet rollers 28.

The individual mold molds 24, 24 ', during the circumferential movement of the chains 25 and 25', respectively, are rotated into a molding section 30, 29 'and 29', respectively, in which mold mold parts 24, 24 'are joined two and two to form a mold. In order to achieve a rapid closure of the mold mold parts 24, 24 'to a parallel and opposite position, so-called shutter rollers 31 are provided which accelerate the rear ends of the mold mold parts 24, 24' 20 together in acceleration.

Within the mold section 30 itself, the molded mold parts 24, 24 'located opposite each other are pressed against each other by guide rollers 32 pivotally mounted in guide strips 33. The inlet rollers 28 are pivotally placed 25 on top of the machine table 2 around shaft pins 34.

On the upper side of the mold mold parts 24, 24 'a tooth 35 is formed, whereby the two tooth teeth 35 on the paired mold mold parts 24, 24' align with each other, so that a common drive gear 36 from above 30 can engage this tooth 35. , whereby the drive sprocket displaces the mold mold parts 24, 24 'through the molding 30 as a closed mold in the molding 30. The driving of these drive gears 36 takes place in a known manner by a motor not shown.

DK 152569B

6 On the apparatus shown, plastic tubes are manufactured with a cross-profile, ie. with circumferential grooves along the circumference, such as those which e.g. used as protective cables for electrical cables. To this is provided an extruder 5 from which only the syringe head 37 is indicated, from which is extruded a hose 38 which still runs in hot plastic state into the form formed within the molding section 30 in which the cross-section is formed.

In the embodiment shown in FIG. 1, shown in the right-hand chain 25, there are provided 10 mold molds 24, whose mold depression 39 has the least occurring diameter of approx. 10 mm, while the chain 25 'has molded mold parts 24', whose mold depression 39 'has the largest possible diameter of the mold for the mold depression 39' of e.g. 60 mm. Corresponding matings 15 also possible for larger pipe diameters. It is to be expressly stated that in the production of a tube, mold molds 24 having fomed recesses 39, each having the same diameter and being mirror symmetrically formed, are used. As shown in FIG. 1, the mold recesses 39, 39 'are each arranged so that their lower rim is always spaced at approximately the same - least possible distance from the underside of the mold mold part 24 and 24', respectively. from the upper side of the machine table 2. For small diameter mold depressions 39, for the purpose of material and weight saving 25, cavities 40 are formed in the form of bores extending in the production direction within the mold parts 24. The vertical center distance a between the longitudinal center axis 41 in the smallest diameter die recess 39 and the longitudinal center axis 41 'of the largest diameter die recess 39' correspond to the height adjustment distance b which the bearing bodies 13, 13 'must be able to be adjusted at least in the bearing blocks 10. Since there is also a smaller lifting reserve c , the possible total height setting b + c is greater than the equal distance a.

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DK 152569B

When tubes of a different diameter are to be produced on the same apparatus by replacing the mold molds 24 and 24'f, respectively, a height adjustment of the machine table 2 corresponding to the change of the position of the longitudinal center axis 41 and 39 'of the mold depression 5 and 39' is required. . As the extruded / still hot plastic hose 38 extruded from the spray head 37 is supplied to the mold itself freely / hangs down slightly. In addition, for material or temperature reasons, it may be slightly offset.

These tin settings of the mold in the elevation direction and the side direction to obtain an accurate inlet of the tubing 38 in the mold are performed by the operator from one side next to the spray head 37, so that the person in the height and / or side setting can accurately monitor 15 inlet of the hose 38 in the form formed.

For the formation of said circumferential cross grooves on the tube 38, corresponding cross grooves 42 and 421, respectively, are formed in the respective mold depressions 39 and 39 ', respectively. Similarly, in these transverse grooves, by means of bore 20, vacuum ducts 43 are formed 43 'in the mold mold portions 24, 24', the inlet of these vacuum ducts being located on the underside of the mold mold portions 24 and 24 ', respectively, adjacent to vacuum main ducts 44 which are formed in the machine table 2. In addition, in the mold 25 the portions 24 and 24 ', respectively, are further formed by means of bore cooling ducts 45 and 45', respectively, which are immersed in cooling water supply 46 in the machine table.

The design of the vacuum ducts, the cooling ducts and, in particular, also the design of the entire apparatus up to the front end, seen in the production direction 3, at which the finished transverse groove tube exits, is known in detail from German publication specification no.

20 61 027.

Claims (6)

15 Patent claims. 1. Apparatus for producing plastic tubes with cross grooves, in which molded molding parts, each provided with a mold depression and joined in pairs to a mold, are placed on top of a machine table where they are routed in a circuit and there is a piece in front the mold, seen in the production direction, is arranged a syringe head on an extruder, and which apparatus is adapted to work with mold molds having molds of different diameters, characterized in that the machine table (2) is arranged for height and side adjustment perpendicular to the direction of production (3), and the elevation and / or side adjustment devices are disposed on one side of the machine table (2) in the vicinity of the spray head (37), a shaft (5) for use at lateral position. is mounted in a bearing bracket (10) which is arranged on the machine table (2) and for the purpose of height adjustment of the machine table (2), control coupled spindle drives are provided, bearing bodies (13, 13 ') / which are high countable by lifting spindles (19, 19 '), and receiving the respective shaft (5), are arranged and inserted into recesses (12) in the bearing brackets (10). DK 152569 B Apparatus according to claim 1, characterized in that the shaft (5) is freely slidably mounted at one end thereof in a further bearing bracket (10). Apparatus according to claim 2, characterized in that the shaft (5) has a shoulder (15) projecting from a groove gear wheel (4) for turning. Apparatus according to claim 3, characterized in that it has a safety bracket (17) which is hinged on the machine table (2) and which is adapted to cover the shoulder (15) and can be pivoted away from it. Apparatus according to claim 1, characterized in that all lifting spindles (19, 19 ') are connected by means of a sprocket sprocket sprocket s drive. Apparatus according to Claim 1, characterized in that the mold grooves (39, 39 ') of different diameters have different center spacing from the machine table (2). Apparatus according to claim 6, characterized in that the mold grooves (39, 39 ') of different diameters have approximately the same minimum distance from the machine table (2). 25 30 35