DE8527216U1 - Device for handling workpieces on a plastic injection molding machine - Google Patents

Description

The innovation relates to an automatically operating device on a plastic injection molding machine for handling of workpieces.

In plastic injection molding machines, these are in the molds manufactured parts after finishing and cooling and opening the mold, ejected and supplied for further use, for example packaged or stored in an orderly manner. For this purpose there are handling devices that the manufactured Remove parts from the mold and store them in an orderly manner outside of the machine.

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l | - Parts are often manufactured in plastic injection molding machines,

which are provided with reinforcements or lugs. These are primarily reinforcements or approaches made of metal exist. For example, prefabricated sheet metal parts placed in the cavity of the mold before injection,

which are then completely or partially overmolded during the injection molding process. Screws or bolts are also used before the injection molding process inserted into the shape of the mold, then partially encapsulated on their head, so that the finished plastic part by means of this screw bolt to other parts of an overall structure can be attached. Especially on plastic parts that are in used in electrical engineering are sockets or soldering lugs inject. These must first be inserted into the shape of the mold so that they can be overmolded.

The use of such prefabricated, mainly made of metal existing parts in the shape of the mold before the injection molding process has to be done by hand by the operator and is time consuming. Particularly in the case of multiple molds in the molds, there are considerable amounts of material for inserting or inserting Times needed. The working cycle of the machine is significantly extended. So it is not just required that all the time is an operator at the machine, also the so-called number of shots per unit of time that of the injection molding machine for the plastic parts to be manufactured could be achieved is considerable reduced.

This is where aer idea a of the innovation is characterized by a device of the generic type by a vertical duct over the opening space of the two-part injection mold, in which a carriage with a transport plate by means of a drive, for example a pneumatic or hydraulic cylinder, is vertically movable, from a lower position opposite the fixed mold half to an upper position opposite an end plate with at least one feed magazine for parts to be inserted into the mold half, the one being arranged above the machine

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On one side facing away from the transport plate, the end plate carries at least one magazine for the orderly supply of parts and in the end plate the outer shape of the parts delimited passage Openings for each magazine are arranged on the opposite side of the magazine, both sides of the vertical Opening slightly overlapping leading edges are completed and behind which channels in full width and depth equal to the material thickness of the parts running upwards up to

^ an interruption of the guide edges to the full width of the mold,

J 16 with the transport plate with nests in the form of the to be fed {Parts are provided which are assigned to each magazine outlet and

■; in which holding devices for the parts, for example in

; Form of permanent magnets are arranged and under which in front

jumping ledges are arranged to engage in space

jis 15 between the leading edges on the end plate, the transport plate is provided on their nests with the plate penetrating ejector pins, which on one behind the transport plate

<horizontally movable opposite this with its own drive

common ejector plate and continue with the

ϊ 20 Path of the transport plate from the removal position from the magazines ; -, up to the position directly opposite the fixed form

half of the injection mold is enough, in their mold cavities as well

{ for example permanent magnets to hold the

'■ parts fed to the thrower pins are arranged.

f ^25th

Instead of the magnetic holder, you can use the transport plate and possibly also in the stationary mold half of the injection mold at the mold cavities openings can be arranged, which are connected to a line are connected with an appropriately controllable negative pressure. According to another embodiment, in the transport plate in deep trained mold cavities, for example for the inclusion of Screw bolts are used, clamping devices, for example, be arranged in the form of mutually displaceable plate parts.

According to an advantageous development of the device is the

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Transport plate can be moved horizontally with respect to its guide and the end plate of the magazine is roughly the same vertical Level like the mold side of the fixed mold half d3S mold of the injection molding machine. According to a particular advantage - stick embodiment, the vertically upright guide in the device according to the innovation consists of two columns, which by means of claws on the two upper guide halves of the movable Mold halves of the mold of the injection molding machine are attached.

Hit a device according to the innovation are arbitrarily shaped Parts and also parts in any number of a mold half of the mold of the injection molding machine and all of them at the same time to be used in this half of the shape by Maga zinen. It is therefore no longer necessary that on the machine constantly an operator uses the parts, but it is at most necessary that an operator from time to time Time to ensure sufficient filling of the magazines, if they are not with known feeding and filling devices from one large supply can be fed ago. The overall working cycle is shortened considerably because it is in half for everyone parts to be used only a machine movement takes place with which all parts are used at the same time. The feed can be done in such a way that the carriage with his Transport plate already filled with parts, "waits" above the molding tools of the injection molding machine, so that after opening it of the molds and ejection of the previously manufactured injection molded parts, only the short feed and insertion movement as well as retraction movement has to perform before the mold halves of the Close the injection molding machine again. With a device after The innovation can also achieve a significantly higher level of precision: In particular, when a larger number of parts to be inserted are to be fed from the magazines all cavities of the transport plate with a contact sensor be provided, which gives a signal before being fed to the mold,

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if the mold cavity is not filled with a part.

The innovation is explained below using an exemplary embodiment explained in more detail with reference to the drawings. Show in the drawings

Figure 1 is a perspective schematic overview

a device according to the innovation Figure 2 is a side view

FIG. 3 shows a plan view of the end plate on the magazine; FIG. 4 shows a horizontal section through the end plate FIG. 5 is a vertical section along the line VV

of Figure 3 Figure 6 is a plan view of the transport plate on

sleds Figure 7 is a side view of the transport plate, partially

cut

FIG. 8 shows a part to be inserted in a front view FIG. 9 side view of the part according to FIG. 8

FIG. 10 shows a finished part in front view 20

FIG. 11 shows a part corresponding to FIG. 10 in side view

FIG. 12 a part cut through the transport plate another part to be inserted

In the schematic overview according to FIG. 1, only the essential parts are shown in a simplified manner in order to provide an overall overview and to illustrate the function. In the is not shown as a whole plastic injection molding machine the fixed mold half 1 of the mold attached to a base 2, in the front side 3 of the mold half is the Injection mold 4 engraved. Horizontal guide bars, namely upper ones, run from the clamping 2 of the injection molding machine Guide bars 1 and 2 and lower guide bars 3 and 4 for the guide carriage 5 on which the movable mold half 6 of the mold is clamped. Do not grip the slide 5 here cylinder shown, -that close the movable mold half

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press and open.

On the upper guide rails 1 and 2 are by means of claws 6 and vertically upright guide pillars 8 and 9 attached. A slide 10 is attached to this vertical guide horn 8 and 9 vertical movement. The movement of the carriage is represented by parts A and B.

On the carriage 10 is on the fixed mold half 1 facing side a transport plate 11 with their auxiliary drive ben and moving devices arranged. A magazine 13 for the parts to be inserted is arranged above the fixed mold half 1 and at a sufficient distance above the injection molding machine. This magazine 13 consists of an end plate 12 with passage 14 and removal opening 15 for the parts to be inserted.

Behind the passage 14, a guide channel 16 is arranged, in the opening 17 of which the parts 18 to be inserted are to be pushed in in greater numbers. The parts 18 can by hand or by means of a feed device can be inserted from a large supply into the guide channel 16 through the opening 17.

In the exemplary embodiment explained here, the production a bottle opener treated. According to FIGS. 8 to 10, this bottle opener consists of a metal part, for example wise made of strong nickel-plated sheet steel, with a Plastic handle. The metal part, so the part 18 to be inserted has a flat oval outer contour with an opening that extends up to on a flat 19 is circular. A web 20 is attached, which is provided with two through holes 21 and 22. Corresponding FIGS. 10 and 11 show this part 18 to be inserted, a metal part, at its end associated with the web 20 and on the web 20 encapsulated with plastic in order to form a handle 23. The entire outer contour and shape corresponds to that in the mold halves 1 and 6 engraved injection mold 24.

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According to FIG. 2, which shows a side view, the front spars 2, 3 and the column 9 being omitted for the sake of clarity, the columns 8 and 9 are connected by means of a yoke 25 at the uppermost end of the columns 8 and 9. A preferably pneumatically operated long lifting cylinder 26 is fastened to the yoke 25 between the columns 8 and 9. The piston rod 27 of the cylinder 26 is expediently connected to the slide 10 in the middle in a holder 28. The carriage 10 itself is guided on the columns 8 and 9 with sliding eyes 29.

The end plate 12 of the magazine 16 and thus the entire magazine is fastened to the yoke 25 by means of a holding arm 30. The top one The boundary of the injection molding machine is indicated by line 31.

The transport plate 11 is attached to the carriage 10, which is shown in its lowermost position in FIG. In the lowest position shown, the transport plate 11 is directly opposite the stationary mold half 1 in the machine. Between the transport plate 11 and the slide 10 there is a base plate 34 firmly connected to the slide 10. The transport plate 11 is guided by rods 32 and 33 in the base plate 34 and on the slide 10 and is movable in the horizontal direction, according to arrows C and D. The transport plate 11 is moved by means of a pneumatic cylinder 35, which is roughly in its center and thus in the middle of the base plate 34 on the carriage, the transport plate 11 is therefore from carriage 10 against the fixed mold half 1 in accordance with the arrow D to be because of so that it rests against the surface 3 of the mold half 1 with its surface area. It must be moved back from the mold half in the direction of arrow C. In the same way, the transport plate 11 is to be moved in the uppermost position of the slide against the end plate 12 of the magazine 16 and pulled back again from there .

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In Figures 3 to 5, the end plate 12 of the magazine is shown. FIG. 3 shows the front view and FIG. 5 shows a section along the line VV of FIG. 3. The end plate 12 has, in continuation of the individual magazine channels 16, openings 36 which correspond to the outer contour of the parts 18 to be fed (FIG. 8). The densely nachgeschoben from the magazine channel 16 to close parts slide in the opening 36 to the foremost part of the outer opening of the aperture 36 with the two sides of its V'crderf laugh against one limit asr aperture initiated.

Grooves 37 are formed on the outer surface of the end plate 12, the width of which corresponds to the largest width of the opening 36 in a horizontal section. Before these grooves 37, their edges overlapping sheets 38 are attached, of which the opening 36 is limited on the sides, so that the foremost to be fed part 18 with its front surface against the inner surfaces this overlapping sheet 38 rest and the part 18 lies in the groove 37. The depth of the groove 37 therefore corresponds to the strength of the part 18. The part 18 is in the space 39 between the Covered metal sheets 38 are visible and accessible from the outside. Above the perforations 36 in the end plate is located in the J Sheets 38 have a shape extension 40 which corresponds to the shape of the covered j areas of the part 18 and up to the width of the groove 37 j is trained. It can be seen that the foremost part j 18, which is pushed through the opening 36 from the magazine,] in the groove 37, there guided by the overlaid metal sheet 38, is pushed up to the opening 40 and removed there forwards - \ men can be. ^!

In FIGS. 6 and 7, the transport plate 11 is shown with its substructure on the slide 10. On the outer surface of the transport plate Π protruding strips 41 are arranged, which the depth and width of the grooves 37 in the end plate 12 of the magazine and fit into it. There are nests 42 in these strips 41

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which correspond to the outline of the part 18 to be fed. The transport plate 11 is supported by the carriage 10, the end plate 12 of the magazine opposite, set. Then moved the cylinder 35 on the carriage 10, the transport plate 11 against the end plate 12, so that the strips 41 engage in the grooves 37 on the end plate 12 and the nests 42 extend over the in these Lay the grooves in the parts 18 lying ready. The transport plate 11 has with these parts 18 thus produced a form fit. The carriage moves the transport plate upwards, with the foremost parts 18 lying in nests 42 are taken away until they have reached the recesses 40 in the sheets 38 covered with the grooves 37. The parts 18 are thus on the end plate Magazine released and can be pulled out through the openings 40. Magnets 43 are arranged on the transport plate 11 at least one magnet 43 is assigned to each nest 42. These magnets 43 hold the parts 18 in their nest 42 in the transport plate 11, if this from the end plate 12 on the magazine is withdrawn against the base plate 34 by means of the cylinder 35.

The transport plate 11 is now under from the carriage 10 Actuation of the cylinder 26 and the piston rod 8 shifted downwards until they are in front of the outer surface 3 of the fixed mold 1 has arrived. Here the transport plate 11 of the cylinder 35 resting against the surface 3 of the molding tool 1 moved in the direction of arrow D in Figure 2. By pushing part of the base plate 34, the ejector pins 44, which are assigned to each nest 42 in the transport plate 11, moved together with the base plate 11. In the mold half 1 are in the corresponding mold cavities for the parts 18 as well Magnets arranged. These magnets in the mold half 1 hold the supplied parts 18 in the nests of the mold half 1 after the transplate 11 in the direction of arrow C in Figure 2 τη direction is retracted onto the base plate 34 and the ejector pins * 44, the parts 18 out of the nests 42 of the transport plate

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presses and thus into the corresponding opposite nests have brought to the mold half 1. The action of magnets 43 on the transport plate on the parts 18 due to the peeling the base plate and the retention of the parts 18 after. The solution of the parts 18 of the transport plate or of the

Magnet 43 can be improved by attaching the magnets 43 to the transport plate by means of a pneumatically operated piston be withdrawn by a certain amount.

After inserting the parts 18 into the mold half 1 and pulling back the base plate 11, the carriage 10 moves the base plate back in the direction of arrow B into its upper position the end plate 12 of the magazine. The mold halves 1 and 6 of the machine can close and the work cycle of the injection molding machine can be done.

Instead of magnets 43, the parts 18 are in their mold cavities 42 to hold in the transport plate 11 by means of negative pressure. For example, the parts 34 shown in cross section in FIG. 7 are then provided with a central bore which is connected to a vacuum line is connected. The negative pressure on the front surface of the parts 43 then holds the parts 18 to be fed during and after the removal of the end plate 12 of the magazine in their nests 42 on the transport plate to the parts 18 in the Nests of the mold half 1 are used or placed.

If the parts to be fed are screw bolts 18a according to Fig. 12, then these are expediently carried out in the transport plate 11 Pincer action held. For example, the transport plate consist of two mutually displaceable plates 11a and 11b. The bolt 18a has about half of its length, which is designed as a square when playing sv / ei se, while the other Half of its length is provided with a thread. "This thread should protrude from the finished molded part and free-35 lie - it is therefore fixed in a corresponding hole in the

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standing mold half 1 to use. The bolt is from the maqazin fed in such a way that its end provided with a square protrudes from the end plate 12. After the transport plate is in the magazine opposite is brought into position, it is advanced so that the square formed part of the bolt is received in the nest 42a * Then the two plate parts 11a and 11b so shifted against each other, so that the bolt is clamped in the nest 42a. The transport plate can then be withdrawn from the end plate 12 of the magazine in order to feed the bolt to the mold half 1. There the transport plate is pushed against the front surface 3 of the mold half 1 and the Bolts 18A are inserted into the corresponding nests in the mold half 1. The two plates 11a and 11b are the transport plate form, are then shifted against each other again, so that the opening forming the nest 42a is aligned wall parts Has. The transport plate can then be withdrawn after the bolts have been released. There are the bolts in the mold half 1 used and the injection molding process can be carried out.

Claims (6)

I. Patent attorney "" 6 · ** · * ·· «t. 4830 Gütereloh 1, Vennstrasse 9, Postfach 24 Telephone: (0 52 41) 1 30 54 CHpWng. G. Μβ Id SU Oalum OlpL-PhysUr. H.-J .θΐΓ3Ι_Ι IJ Our mark η 7βΛ _ riM / mc protection claims 1. Automatically working device on a plastic injection molding machine for handling the workpieces, characterized by a vertical guide (8,9) over the opening space of the two-part Injection mold (1,6) on which a slide (10) with a transport plate (11) by means of a drive, for example a pneumatic or hydraulic cylinder (26). vertically movable from a lower position with respect to the fixed mold half (1) to an upper position opposite to an end plate (12) with at least one feeding magazine (16) for einzulegende in the mold half (1) \ parts (18) wherein the above Machine arranged j 20 nete end plate (12) on its one side facing away from the transport plate (11) carries at least one channel (16) for the orderly supply of parts (18) and in the end plate (12) the outer shape of the parts (18) delimiting passage opening2n ( 36) are arranged for each magazine channel (16), which are closed on the ^{side opposite the magazine channel 25} (16) by vertical guide edges (38) that somewhat overlap both sides of the X opening (36) are and behind which grooves (37) in the full width of the parts (18) and from the depth equal to the material thickness of the parts (18) up to an interruption (40) of the leading edges (38) to the full full width of the mold, the transport plate (11) with nests (42) in the form of the Parts (18) is provided which are assigned to each magazine outlet and in which holding devices (43) for the parts (18), for example are arranged in the form of permanent magnets and under which protruding strips (41) are arranged for engagement P 764 - gM / if into the groove (37) between the guide edges (38) on the end plate (12), the transport plate (11) at its nests (42) is provided with ejector pins (44) which penetrate the plate and which are located on an opposite side behind the transport plate (11) over this horizontally movable common base plate (34) with its own drive and continue with the Path of the transport plate (11) from the removal position from the Magazines up to the position directly opposite the fixed mold half (1) of the injection molding form, in their mold cavities also holding devices for the parts (18), for example in the form of permanent magnets that run through the ejector pins (44) supplied parts (18) are arranged. 2. Apparatus according to claim 1, characterized in that openings are arranged in the transport platform (11) and possibly also in the fixed mold half (1) of the injection mold on the mold cavities (42) which are connected to a line with an appropriately controllable negative pressure . 3. Apparatus according to claim 1, characterized in that in the transport plate (11) in deep mold cavities (42a) clamping devices, for example in the form of mutually displaceable plate parts (Ha, lib) are arranged. 4. Apparatus according to claim 1, characterized in that the transport plate (11) relative to its guide (8,9) is horizontally movable and the end plate (12) of the magazine approximately in the same plane as the front side (3) of the fixed mold half «? (1) lies. 5. Apparatus according to claim 1, characterized in that each nest (42) in the transport plate (11) is provided with a contact sensor for determining the filling of the nest (42). 6. Device on a plastic injection molding machine, preferably f.-? .- · .. ·: .. P 764 - gM / if according to one of the preceding claims, characterized in that the vertically upright guide consists of two columns (8 and 9) which by means of claws (6 and 7) on the two upper guide frames (1 and 2) of the movable mold half (1) of the mold the injection molding machine are attached.