DE1479859A1 - Device for cooling and deburring molded parts made of elastomers and thermoplastics - Google Patents

Description

DIETRICH'LEWKSKY PATENT ADVOCATE

_τ 2Ι - 6otthontar.II Ttltft »511762

P AH 75

SHB VHBBIiABRAtOR OORPORATK », Mlthavaka, Indian» USA

Device for cooling and deburring of foratella Elastomer and thermoplastic punch artist off tu;

Device for cooling and deburring clay shaping does Blatto mers and thermoplastic plastics, consisting of tihtm Jet skin and a spring device but accommodates the parts and aum turning and turning the same, as well as a sole oar device, in order to put the parts in the blasting housing with blasting media ”and the like irradiate, as well as a distributor to distribute the coolant la dat Oehäuae on the parts bü strahl "" and a dust collector connected to the jet housing "dtsstn Hula" with the jet housing communicates to vtrbrauohtts, cold Coolant and added material ”, a leaflet of the Particles from the removed ridges and ridges of the irradiated » Take up molded parts, whereby in the jam a separation of the particles are allowed to remove the brewed coolant,

909821/0870 New »Untaria9en, iArt.7ii Afc ^ tmi am ^ eitiunnwe ^» »>. t, mn

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■ owlt ftrntr with «Inta dl · Yorrlahtung» giving »Thäuee.

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Invention bealeht eloh lnebeeond ·! ·· on tin · ua dl · XMipMratur aur ö # fri * rune of ribs and ridge «! r »b» ujtt »tn, among other things tin · V # reprödune and tin · removal of dti Ttreprödtttn ribs or 0rate duroh 8ohlaftin« vlxfcunf elttti · Stvahlaltt ·! cause au.

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In the Swiss patent Hr. 380 363 a method and a device for removing thin ribs and burrs from molded parts which are covered with rubber was described. Here, the molded parts were blasted with a blasting agent by a spinner after they had been exposed to a coolant. The freezing of the ribs and burrs or the parts of the molded parts provided with thin cross-sections causes embrittlement and allows these parts to be removed completely in a simple manner. The removal takes place as a function of the impact exerted by the blasted particles Λ against the surface of the molded parts. The irradiated molded parts are rotated and turned at the same time in a housing.

The present invention relates to a similar device. In particular, it is an object of the present invention to provide an apparatus for effective removal of ridges and ridges and other thin ones To achieve sections of the surfaces of molded and other manufactured parts.

The object of the invention is also to provide a more effective application of cooling, particularly the amount of cold required for removal of ribs, ridges and similar parts with thin cross-sections. This creates the possibility of a more effective use of the hatch of the amount of cold to obtain, with it, cooled air or another gas or

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the style can be trsitlt, and tint adeere distribution experience. As a result, there was a lot more cooling down Stilt and tint bttetrt Utbtrdttkung dtrttlbt »ait cold · and tint welter rolled delivery dtr mi tat * ftmtndtn style is dont be.

Ton blihtr known devices eua lUhla and lntfrattn ▼ oa Pornttiltn unttrsohtidtt "loh the device gtatlee ror-Brfinduni by the fact that the dtr utwilMaMlcr $ i% ink T" rtthcn iit _f whichoher in tintm KrtitlaufiytttM over

^ lines, QtblMtt and Väreeauttaueoher, bew. tint cooling unit, "it tint" let connected in the distributor protruding into the skin, among other things dft · separate coolant again tint the new "cooling channel", and the temperature raised again to the temperature in the distributor through the distributor »Ehhuet« u ttrahln »

The payment is shown in the presentation of the present Invention In fourfold representation, and "war"

· 1 tint echematic representation of the device In dtr front ankle, la cut,

Fig. 2 shows the same device in side view, Is cut and

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Fig. 3 dit gltloht Vorrichtuug, wit old In dtr Flg.l

and Pig. 2 let, Jedooh in plan.

The invention Itt with reference to the term τοη air » or Oaa or cooled liquid old coolant btschritbtn.

As described in the patent, the processing is carried out on the basis of a principle which means that there are "divisional quantities of the processing parts of the processing suggests wtrdtn. There will be 10 cases in the device on one Pördtirorrlohtung old one « tndloatn conveyor belt 12 loaded. Dae tndloat conveyor belt 12 is about disks 18 and rollers 14 and 16 gtiogtn and τοη a disk or chain wheel 15 is driven. Dat tndloee conveyor belt 12 iat ao arranged, data daa obtrt Trum deeatlben below and behind a pair of τοη 8eitenaohelbe 18, which is abgtatUtst tind on shafts 20 · DtB -followed, if the stlttnaohtibn 18 rotate, dta endless conveyor belt 12 on ttinea Wtg gtfuhrt, woduroh tint well 19 is formed, in which the format tilts XO rotated and gtwtndtt wtrdtn · Anattilt dta Yorbesohritbantn Suitable types of funding can also be used for the application.

A movable door 22 let Torgttthtn, through wtloht successively divided quantities of τοη molded parts In dit Sntgratungakaomer tin- and aue dtreelbtn wtrdtn wtrdtn can. Dabti follows the loading doorway old Helps to let the ink

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loading chute 23. During normal operation, the daa conveyor belt 12 eo driven, the upper run of the conveyor belt is constantly moving inward and upward towards roller 14. During operation, the molded parts by the conveyor belt 12 constantly pulled inwards and upwards until they are slowly directed vertically upwards on their Tip over way. The conveyor belt 12 is preferably provided with strips to facilitate the movement and pivoting, for example. To facilitate rotation of the workpieces during the conveying operation. An unloading chute 23 is provided to take up finished molded parts as soon as the deburring process of a divided set has been completed, wherein the direction of travel of the conveyor is reversed to bring the workpieces forward through the open door onto the chute 23 to promote.

For example, conveyor belts can also be used in which wear-resistant material, for example rubber or plastic, is used, whichever is the case remains in a flexible state below a temperature of 0 degrees C. ! The wear-resistant rubber »or Plastiomaterial can be used instead of the plates or strips made of metal for the chain belt conveyor Application. The conveying device is arranged in a closed housing 25, in which one or more centrifugal jet machines at a suitable location 26 are attached. In any case, the centrifugal jet device 26 is driven by a motor 2Θ and thus an-

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ordered, daaa dae abrasive from the same directly down into the housing 25 between the side windows 18 is sole ouded so that it hits the molded parts 10 · As in the Pig. 2, bind the sole ejector devices 26 to be arranged so that they hurl the blasting media in a jet shape against the molded parts, as is indicated by reference characters 30. The centrifugal blast machine 26 is arranged in such a way that it is constantly supplied with blasting media from a silo 42. Eb is understandable, that also more than one centrifugal jet device for the Zweok sum can be used to carry out an additional irradiation of the molded parts with blasting media can. Between the silo 42 and the supply triohter the sole ejector device 26 is a valve 32 for the supply of the blasting agent to the centrifugal blasting device is provided. This valve 32 is preferably against the surrounding atmosphere sealed to prevent the ingress of relatively warm air, which from the insulated housing 78 can get into the centrifugal wheel by its suction. This seal is special ' important when deburring materials such as parts made of organic silicone. Because of the very low embrittlement temperatures it becomes extremely cold Air is required as a coolant to direct this against the molded parts, each into the deburring chamber through the Centrifugal device penetrating warm air can only be disadvantageous even with the best possible operation. The Ab-

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seal around the valve 32 for the abrasive tonn Guoffli plates are manufactured which have a low embrittlement temperature. They can be attached in an air-permeable manner. But she can also al Metal plates made a.

The conveyor device 12 for the molded parts iet old Durohgangelöchern provided, uni through this .Ein passage see below creates for the used blasting media, for the used cold air and small bumps or burrs originating parts removed from the organs in the Torr direction during the treatment.

The used blasting media, small residues and used air get close to the bottom of the baffle 33 Via a receptacle 34 to an inlet «In ·· Bucket elevator 36, which takes the genius from residues, blasting media and the like, a separator 38.

Boron separator may be of any design and may include a rotating screen 40 as well as a vase separator. In any case, the separator 36 let arranged so that it nioht useful Beetandteile the conveyed mixture, einechlleeslloh nioht again ■ usable portions of the jet means and the side remote from the ribs and ridges is eliminated particles. The reusable blasting media is conveyed by gravity into the blasting media oil container 42, from welohe.η the sole ejector jet device. 26 via a special from »

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sealed valve 32, as vorbesohrieben, with abrasive is supplied.

After describing the mechanical elements of the machine, the course of the cooled air is now through! the machine explains. The molded parts made of elastomers and thermoplastics such as natural rubber, Buna or neoprene change their physical properties depending on the lowering of the temperature, whereby they are embrittled by the cold. It will be understood that some materials at% to a cooling temperature in the range of minus 20 degrees C to minus 40 degrees C to be brittle, while others, which are made for example of silicone rubber or blastomeres here, "a very low temperature, in Bereioh of approximately minus 60 degrees C to minus 120 degrees C, need for brittleness »

The cold air coming from the Y / ärmeaustauacher passes through the pipeline 60 in the device to through this in ^; the housing 25 to a manifold 62 to flow. The distributor 62 extends inside the housing 25 in the transverse and longitudinal directions over the conveyor device 12 and is provided with bosoms which are arranged so that they flow downwardly of cold air onto the surface of the molded parts 10 in an even manner in a distributed manner.

The distributor 62 performs a function as a spreader room, which hangs from the top wall of the case and

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is isolated from the latter. The distributor 62 can expediently be distributed evenly on the bottom wall Outlet opening or nozzles can be provided around the outflow from the storage space or from the nozzles to distribute cold air.

To ensure an even distribution of the cold air, and to achieve that it can flow through the mold parts 30 moved on the conveyor device 12, and that the molded parts in the best possible way simultaneously

^ are exposed to the jet of abrasive particles and the cold, a baffle plate is inside the housing 25 66 arranged, which extends over the entire width of the housing and in an area below and next to the bottom the conveying device 12 is attached to the housing wall inclined towards the front. The baffle plate 66 runs here to the front under the conveyor belt and ends shortly before the V / and 33 of the receptacle (see FIG. 2). The wall 33 », which extends over the entire bottom width of the housing, runs from the front wall of the housing - in

"Inclined downwards at an angle - to the rear wall of the case.

The baffle plate 66 serves to prevent unsatisfactory utilization of the cooling air introduced into the housing. The from the distributor 62 to the conveyor 12 centrifuged, cooled air 64 first flows onto the upper part of the conveying device and then flows

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free through this hindu »through the inclined baffle plate 66, which allow the cooled air to flow freely through the low resistance sections of the conveyor « device 12 obstructed, the cooled air is forced to caused by the mass of the molded parts moved and turned on the conveyor device through are the ropes with thin cross-sections much more consistent and similar to the cooled air infused. This results in faster freezing and removal of the thin parts whereby the treatment cycle is shortened accordingly. Bas coolant and the amount of cold available can be used during the operational side of the Maeohine can be better treated.

The inclined baffle plate 66 is not only used for distribution of the cooled air but it also performs a function as Separator off «whereby the used blasting agent is conveyed near the front over the surface of the baffle plate 66 to the underlying wall 33 of the receptacle. There is a separation of the used cooled air from the Residues and from the blasting media, as well as from the solid components which fall through the conveyor 12 »

In this case, runs of the nozzles of the manifold 62 inserted gekühlto air from the conveyor belt 12, respectively, and forward practice ?: ¹ the lower end of NaOH by the available on the conveyor belt moldings below the baffle plate 66 further into the storage chamber 68 of the baffle plate 66

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is bordered to outlets 70, which are in the housing 25 in the Rear wall are arranged under the baffle plate 66. the Used cooled air is out of the housing 25 through the outlet opening * ^ and the lines 72 laterally in a dust collector 74 performed.

From the interior of the insulated housing 78, air flows into the separator 38 in order to be reusable through the latter Separate blasting media from foreign components. From the separator 38, the air passes on through a line fe 76 to meet with the stale air that flows from the housing through line 72 to the dust collector 74 .. A relatively small amount of air can from the isolated Housing 78 inserted through the centrifugal wheels 26 of the centrifugal blasting machine into the housing 25 with the blasting agent will. To such by the centrifugal wheels from the housing 78 Replacing the removed air and keeping the temperature in the housing in a cool state becomes a corresponding one Amount of spent chilled air is directed into the housing 78 through the conduit 80 to the blower 84, from which

™ iron is conveyed from the air through the heat exchanger, i

to cool the air down again. From here the ge = »

; cooled air through line 60 back to manifold 62 into the Housing 25. The temperature in the housing 78 becomes low Maintained temperature so that only dry air with a low condensation point (dew point) is introduced into the housing 25 will. A mechanical cooling unit 94 is used to cool the

'. Air in the housing 78 is used. Via the control panel 88

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become the cooling circuits of the mechanical cooling unit 94 regulated. The fan 84 is driven by an electric motor

A control panel 90 is attached to the outside of the housing and serves as the center of gravity for the cooling circuit. All control processes take place as a function of the temperature control inside the housing and the selected temperature for operation with the particular material from which the molded parts are formed or which are to be processed in the machine. The control panel 90 also serves as M 3chaltorgan for operating the Entgratungsmasohine for opening and Sohliessen of the doors on and off 'the Sohleuderräder, for changing the speed of the centrifuging wheels driving the engine, to vary the amount of blasting agent, as well as for controlling the operation and the conveying speed of the conveyor 12. The control panel 90 also contains a timer, a temperature sensor and transmission devices which indicate operating faults by means of lamps, and also selector switches and pushbuttons. for the operation of the cooling machine and other components of the cooling system,

In order to simplify the design of the device, the housing 25 was surrounded by a completely airtight and thermally insulated housing 78, which is cooled by the mechanical cooling unit 94 as described above. Thus the housing 25, the sole rudder wheels 26, the abrasive conveying device, a, B _{e are} a Beoher-

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ft

plant 36, the separator 38 and the dust collector 74 all arranged within the heat-insulating housing78. The cold air, emanating from the dust collector 74 »is in the housing 78 is blown to maintain a balanced pressure condition in the housing 78. This also serves to reduce the amount of cooling required by the heat exchanger. Ee is understandable that suitable access doors 92 and the loading and unloading door 22 are provided to access the interior of the housing 78 and the case 25 to be able to succeed. before At the beginning of a treatment, the molded parts are loaded through the door 22 onto the conveyor device 12, the The door can be operated mechanically to open and close can and is designed in such a way that it completely closes the housing 25 in the closed position * This achieves a minimum of that in the housing 25 existing cold can be lost. An emptying chute 23 is adapted to the lower end of the door, over which the fora parts from housing 25 are moved, when the conveying direction of the conveyor is reversed.

It is evident from what has been described above that improvements are achieved by means of the device according to the description through which a more effective use of the cooled air for the irradiation process is possible.

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Claims (3)

PATfNTANVMtT / ^ claims 1.) Device for "cooling and" deburring of standard parts made of elastomers and thermoplastic plastics, consisting of a blasting housing and a conveying device to accommodate the skins and to rotate and turn them, as well as a centrifugal device to blast the parts in the blasting fan with abrasive , eowle a distributor, among other things, a coolant into the housing on the parts "n etimbltn and an old flta Strablgebäuee in connection etebenden dust, 'deseen inlets old the Strablgeb & uee in connection to used, cold coolant and hlncugekoaaene. Materials, praise the particles τοη the removed ribs and (taking up the irradiated pore parts, where la Btaubeeaaler is a «separation of the used coolants τοη the particles darobftfbJ ***), as well as old elnea Ale Vorriohtung« afeb «adeiL insulated housing, daduroh kemwelohnet, because the dust collector (74) old an outlet rereehea let, which is in a circle running system via lines, air (84) and heat exchanger, or a 'cooling unit (94) old a distributor (62) protruding into the housing {25); connected to elnea the separated coolant again 909821/0870 Ν «· utWteHagen 1 * 1.7 ti w» .2 nm BATH ORIGINAL to supply new cooling process, and the coolant brought back to a lower temperature through the To blast distributor (62) into the housing (25). 2. Device according to claim 1, characterized »that in the interior of the housing (25) an impact Plate (66) is arranged, which extends over the entire width of the housing and in an area below and is attached to the housing wall next to the underside of the conveyor device and inclined towards the front. 3. Device according to claim 1 and 2, characterized by one arranged under the baffle plate (66) Storage space (68), which via outlet openings (70) and lines (72) with the dust collector (74) is connected. 909821/0870 BATH ORIGINAL