DE7737243U1 - DEVICE FOR TRANSPORTING HOLLOW BODIES THROUGH A TREATMENT FACILITY - Google Patents

Description

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Metzger & Becker GmbH, Tuttlingen

Device for transporting hollow bodies by a treatment facility

The Invention relates to a device according to the preamble of claim 1.

Such a device is known from DE-Gbm 7 633 252. With her, each workpiece holder has a bearing pin on, which is inserted into the associated hollow pin of the hollow pin chain that it is in operation in Hollow bolt cannot or practically not rotate. This bearing pin protrudes laterally over the chain, and on This protruding area are the inner rings of two ball bearings that have a roller bearing for the one with a hollow one Form section on the outer rings of the ball bearing attached shaft of the workpiece holder, arranged. the hollow section of the shaft serves as a roller body, which is arranged on a side next to the chain track The web can roll, which can be a fixed / immobile web or an endless, powered web can. By rolling the roller body, the shaft is rotated and thus the shaft carried by the shaft is achieved Hollow body in a predetermined manner during the passage the treatment device is rotated at least in parts / so that a uniform effect

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for example, from UV lamps to the entire surface area the workpiece in question is reached during its transport, for example for the purpose of drying of lacquer or color of the hollow body. The interaction of the sleeve with the web in question can be positive or frictional being.

This device according to DE-Gbm 7 633 252 is due to the defined rotation of the carried by the workpiece holders Hollow body extremely advantageous technologically. However, the roller bearings of the shafts are expensive and lead Because of the lubricant required, results are not fully satisfactory if the treatment facility is at temperatures above 80 ° C, as with the commercially available, cost-effective normal ball bearings that are only suitable here for cost reasons The lubricant causing lubrication then no longer properly lubricates, so that increased maintenance requirements and wear and tear and susceptibility to repairs arises. On the other hand, such transport devices are often too Used in treatment facilities where they are exposed to temperatures well above 80 ° C which are often up to approx. 200 ° C and in special cases can also be a little higher.

The invention is based on this prior art the object of the invention to improve the known device in such a way that it is structurally simple and inexpensive

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This way it is achieved that they can also be used in treatment facilities in which the temperatures are well above 80 ° C is exposed, can be used without making the free rotation of the workpiece holder difficult

with you

and without / severe wear and tear or frequent maintenance or repairs are to be feared.

In a device according to the preamble of claim 1, this object is achieved according to the invention in that that an end region of the shaft of the workpiece holder is rotatable in the hollow pin of the hollow pin chain that carries it stored and secured against axial displacement isc and this shaft end area with wear-resistant, temperature-resistant Plastic is coated with a low coefficient of friction.

The invention makes the workpiece holder and its pivot bearing considerably cheaper, since there is only one slide bearing per workpiece holder, the bearing sleeve of which is formed by a hollow pin of the chain that is already present. This plain bearing also does not require any lubrication. This storage withstands high temperatures, which depend only on the long-term temperature resistance of the plastic coating of the shaft end area and can therefore easily be 200 ^° C. and possibly even higher without impairing the free rotation of the shafts and without increasing wear and tear and susceptibility to repair would be feared.

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Fluorine-containing plastics are particularly suitable as plastics for the coating of the shaft end region. Particularly high long-term temperature resistance (approx. 265 C) and an extremely low coefficient of friction are achieved through decomposition of plytetrafluoroethylene for plastic coating achieved. Somewhat lower long-term temperature resistance (approx. 240 C) with otherwise almost comparable Perfluoroalkoxy has properties. In some In some cases, polyfluoroethylene propylene, which has a long-term temperature resistance of approx. 200 C, can also be used. The aforementioned three plastics are sold by Du Pont under the brands "Teflon" with the distinctive Additions "PTFE; PFA; PFEP" marketed.

Some other advantageous developments are also described in the subclaims.

An exemplary embodiment of the invention is shown in the drawing.

The single figure shows a short section of a very long, endless hollow pin chain 10 running in the direction of arrow A, on which a plurality of identically designed workpiece holders 11 are rotatably mounted with sliding bearings, one of which is shown partially in section in the drawing. The hollow pin chain 10 runs on an endless path that goes through

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j runs at least one treatment facility at which

on the workpiece holders 11 located hollow body a

Treatment. The hollow bodies, not shown, can preferably be tubes, cans or ] Like. Act, the surface treated, for example

\ painted and dried by applying heat.

In addition to the orbit of the hollow pin chain 10 is a partially shown path 12, which a
immovable surface or a rotating belt driven by a motor or the like. Be. On this path, in contact with it, the short area 14 of the shaft 15 of the workpiece holder 11, enlarged in diameter by two pressed-on cylindrical sleeves 13, rolls off, whereby the workpiece holder is rotated, for which purpose it is rotatable as a whole in the section shown
cylindrical hollow pin 16 of the hollow pin chain 10
is slide bearing. This hollow pin 16 penetrates a roller 17 of the chain link 18 and also carries two link plates 19 which are attached to a hollow pin of the adjacent
Chain link 17 'are attached.

At the free end of the metallic shaft 15 facing away from the chain 10 is an attachment 21 made of polytetrafluoroethylene or another plastic with a high
Temperature resistance put on, which one to
carrying hollow body is attached, which is not shown. a dot-dash line is shown above the image plane

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tm t

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indicated energy radiator 22 for heating the on the workpiece holders 11 placed hollow bodies are arranged, and while the chain ^ 10 is passing it The rotationally symmetrical shaft 15 becomes the emitter rotated by the frictional engagement of the sleeves 13 on the web 12, so that the hollow body carried evenly over irradiated the entire circumference, and, for example, their paintwork is dried evenly.

The metallic shaft 15 which is coaxial with the hollow bolt 16 of the workpiece holder 11 is at its facing away from the attachment 21, cylindrical, free end region 12 in the The diameter is reduced and the end region 23 penetrates the hollow pin 16 of the hollow pin chain 10 with slide bearing play. This end region 23 is different from the rest Shaft area set off by a right-angled shoulder. This shoulder 24 is partly through one Sleeve 13 is also formed and forms one of two axial stops that secure the shaft 15 against serve for axial displacement in the hollow pin 16. The other axial stop is formed by the free The end of the end region 23 of the shaft 15 protrudes beyond the hollow bolt 16 and a metallic one onto this free end Washer 25 and a quick-release cap 26, which is held on the end region 23 by itself, is put on.

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The circular cylindrical end region 23 of the shaft 15 is covered with a thin layer 27 of temperature-resistant Plastic coated with a low coefficient of friction, so that no lubrication this makes the shaft 15 rotatable bearing sliding bearing is required and yet the workpiece holder 11 easily and without significant Wear in the hollow pin 16 can rotate. PcIytetrafluoroethylene is preferably used as the plastic for the coating 27 or perfluoroalkoxy in question. In some cases, polyfluoroethylene propylene or a is also used Another suitable plastic in question, which also does not require any lubrication in the hollow pin 16 and is sufficient is temperature resistant.

It has proven to be particularly beneficial when the End region 23 of the shaft is rotatably mounted in the hollow bolt with not very small radial play. This play can preferably be approximately 0.15 mm. The inner diameter of the hollow bolt 16 can preferably be approximately 4 µm.

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Claims (9)

Dr.-Ing. DipL-wiyi OSKAR KÖNIGJateirtanwalt Il; It ···· · * Deutsche Bank AG Stuttgart Telephone: (0711) 62 85 61 Account No. 89/00 Telegram: Koenigpat 7000 STUTTGART-I, Klüpfelstraße 6 Postscheck St. 84919 P.O. Box 51 4509 Protection claims Device for transporting hollow bodies, in particular tubes or the like / through a treatment device, e.g. a surface treatment device, with a driven, endless hollow pin chain, one of which is held in the form of rod-shaped workpiece holders, each of which is held coaxially with the longitudinal axis of a hollow pin in the chain that supports it is arranged and has a shaft serving to carry the hollow body, which is rotatably mounted about its longitudinal axis relative to the respective hollow chain pin and that in addition to the chain at least one moving or immobile path is present on which the rotatable shaft can roll to its rotary drive, characterized that an end region (23) of the shaft (15) of the work retainer (11) is rotatably mounted in the hollow pin (16) of the hollow pin chain (10) carrying it and is secured against axial displacement and this shaft end region (23) is covered with wear-resistant, temperature-resistant plastic ( 27) with low friction coefficient t is coated. 7737243 3/16/78 - 2 - 2. Device according to claim 1, characterized in that the coating (27) of the Gehaftendbereiches (23) Made of fluorine-containing plastic with permanent temperature resistance of at least 200 C. 3. Device according to claim 2, characterized in that that the coating (27) consists of polytetrafluoroethylene. 4. Apparatus according to claim 2, characterized in that the coating (27) consists of perfluoroalkoxy. 5. Apparatus according to claim 2, characterized in that the coating (27) made of polyfluoroethylene propylene consists. 6. Device according to one of the preceding claims, characterized in that the plastic-coated End region (23) of the shaft (15) with radial play of approx. 0.15 mm in the hollow pin (16) of the hollow pin chain (10) is stored. 7. Device according to one of the preceding claims, characterized in that the shaft (15) laterally next to the chain (10) has a relatively short., Im 7737243 16.0178 - 3 - Has enlarged diameter, intended for rolling on the web intermediate area (14). 8. Apparatus according to claim 7, characterized in that the end face facing the hollow pin chain of the intermediate region (14) of the shaft (15) forms a shoulder (24) of the shaft (15), which is one of the two Forms securing of the shaft against axial displacement and from that of the plastic coating (27) End area (23) of the shaft of the workpiece holder begins. 9. Device according to one of the preceding claims, characterized in that on the over the hollow pin chain protruding free end of the shaft (15) of the workpiece holder (11) a washer (25) and a self-retaining quick-release fastening cap (26) to prevent the shaft from being pulled off axially are arranged. 7737243 16.0178