CA2172813A1 - Feeding device - Google Patents
Feeding deviceInfo
- Publication number
- CA2172813A1 CA2172813A1 CA002172813A CA2172813A CA2172813A1 CA 2172813 A1 CA2172813 A1 CA 2172813A1 CA 002172813 A CA002172813 A CA 002172813A CA 2172813 A CA2172813 A CA 2172813A CA 2172813 A1 CA2172813 A1 CA 2172813A1
- Authority
- CA
- Canada
- Prior art keywords
- air
- drying
- compressed
- feeding
- processed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000003570 air Substances 0.000 claims abstract description 107
- 238000001035 drying Methods 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 49
- 238000012545 processing Methods 0.000 claims abstract description 11
- 238000012546 transfer Methods 0.000 claims abstract description 7
- 239000012080 ambient air Substances 0.000 claims abstract description 3
- 238000001746 injection moulding Methods 0.000 claims description 8
- 239000008188 pellet Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 description 6
- 238000007605 air drying Methods 0.000 description 4
- 241000282320 Panthera leo Species 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 108090000623 proteins and genes Proteins 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920000426 Microplastic Polymers 0.000 description 1
- YFONKFDEZLYQDH-OPQQBVKSSA-N N-[(1R,2S)-2,6-dimethyindan-1-yl]-6-[(1R)-1-fluoroethyl]-1,3,5-triazine-2,4-diamine Chemical compound C[C@@H](F)C1=NC(N)=NC(N[C@H]2C3=CC(C)=CC=C3C[C@@H]2C)=N1 YFONKFDEZLYQDH-OPQQBVKSSA-N 0.000 description 1
- 101150107341 RERE gene Proteins 0.000 description 1
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
- B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/58—Component parts, details or accessories; Auxiliary operations
- B29B7/60—Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/82—Heating or cooling
- B29B7/826—Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
- B29C31/02—Dispensing from vessels, e.g. hoppers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Robotics (AREA)
- Drying Of Solid Materials (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
A device for feeding a processing machine is provided with a drying container (10), from which the processing machine is feedable via a feeding pipe (11), a compressed-air generator, which generates the feeding means necessary for the feeding of the material, a channel (14), which conducts the compressed-air into the feeding pipe and a return pipe connected at the drying device and connectable with the aspiration hole of the compressed-air generalor (13) in a circulating air position. A transfer element transferable into at least two positions is arranged at the aspiration hole (13a) of the compressed-air generator, wherein the return pipe is connected at one connection and ambient air for a fresh air operation is absorbable via the second connection. In the interior of the housing, at the aspiration hole (13a) space (R) is provided for arrangement of the air dryer, which makes avaiiable the quantity of air for drying the material to be processed as well as a quantity of air for feeding the dried materiai to be processed (Fig. 1).
Description
``~ 2172~13 DescriPtion Technical Field The invention relates to a device for feeding a processing machine especially an injection molding machine for processing plastic materials according to the preamble of claim 1.
DescriPtion of the Prior Art In a feeding device of such a kind according to DE-C 24 09 128 the material to be processed is transported into a feeding area by a heated air pressure stream associated to the injection molding machine wherein in this area the co",presed air can escape via a filter impervious to the material.
The compressed air is at the same time used for drying the material to be processed by carrying the compressed air via a blower bottom to the material wherein the air stream rising upwards absorbs humidity of the material the more the lifting height increases so that clustering of material can be prevented lastingly. The air carried to the drying container streams out of this via a valve provided in the lid into a return pipe or into the atmosphere if the return pipe provided outside the device is not arranged at the aspiration hole of the co",pressed-air generator. In fact the elements of this device are easily accessible due to their a" ~nge" ,ent at the outside however for example the return pipe arranged externally disturbs the handling of the lid when refilling material into the device. The use of supplementary apparatus is basically not inlended and can only be realized under considerab ~ extra expense by arranging exte("ally further components. Since the `
heated air gets into the inferior part of the container by a blower bottom a lot of space is lost inside the housing which on the one hand makes more dimcult a con,pa~;~ construction of the device and on the other hand reduces the volume for the stockable material to be processe~ In case of extreme conditions the air dete"";. ,ed for the conveyance might however be so humidified again that clustering can occur in the feeding pipe.
In the DE-A 14 54 806 a container for pellets is a" anged on a machine s charging shaft in which a fan provides air for drying the material in a middle area of the pellet co"ta;"er. The air can stream out via a con~ , Illy opened conneclion piece which is in pe""aner~l conne tion with a further connection piece by which a part of the air can be re-supplied to the fan. The a"dnge",e, ll of the conneclion piece in contact with the surrounding air has however the disadvantage that also moist air is conslar,lly suctioned. A conveyance of material is not inlended since the material gets into the machine due to the gravilalional force. The return pipe the fan and the element regulating the fresh air or circulating air are a" dnged externally at the container which due to their a, ~ange~ "e, ll at the charging shaft of the machine is less disturbing. Just in case of quick running machines or if several materials are processed however the a"dngel"enl of a material co"~a;ner close to the machine is not desired due to the larger masses to be moved.
From DE-GM 18 96 723 a drying device is known in which a fan for feeding healened air into drying containers arranged above the mount is provided inside the pede:~- ' of a mount. Here the pellets are dried in lots and a reforwarding directly to a " ,ach.. ,e is not i"l.~nded. Due to the a"ange" ,enl of the drying conla,ners above the plane of the plafform sufficient space is available below the mount which is gained by the increased space requirement above the plafform. Since the fan is merely used for drying the material it only takes in the heatend air from the material however has not to gener~le co",pressed air.
SummarY of the Invention Based on this state of the prior art it is an object of the present invention to design a device, ~Ivhich is of the kind described first here,nb~rure, that is easily manageable, compact, adaptable to the different requirell,enls of an injection molding factory and which also meets extreme feeding conditions.
This object is acco,nplisl-ed by the features of claim 1.
In this arrangement a transfer element is provided inside the device. which is llanard~ablc by one manipulation or eventually also automatically into positions in which either fresh air ope, dlion or circulating air operation is realized. That way a co",pacl construction of the device is achieved and acco, ding to the customer's desire a change-over can be effected by merely actuating the transfer element, without the need of additional mounting effort for eAdl "ple for remoYing the return pipe.
Besides, also the basic con.li~ions for i, Iteg, dliol1 or already integrated further elements in a closed housing are created, so that it is easy to cu"espond to the respec~ive cu~lolllela' desires. But also facilitating possibilities for the emptying are created one the one hand by the return pipe arranged inside and the from this resulting undocking of the outlet of the drying con' - ~er for emptying the device. Due to the arrangement of the aspiration hole inside the device, dirt accumulations in the surroundings of the machine do not lessen the drying capability right from the beginning.
If necessary, at the fresh air connection an air treating device as for exdllllJlc an air dryer can be provided, for which, in conl1eulion with the a" dngel "enl of the transfer element, space is available in a protected area inside the housing and ne\,e, ~l leless provides a sufficient quantity of dried air even for the in~eased air throughput when the material to be prucessed is fed, so that also under unfavorable air humidity conditions in humid countries clustering of the material in the feeding pipes is avoided.
The whole drying conlainer according to claim 2 is desiyned in a way, that on the one hand it extends nearly to the bottom of the housing, on the other hand, however, due to a sepa, dlil ,9 wall requires essentially a little more than half of the housing, resulting in a conside,ably inc,eased volume capacity for the material to be p,ucessed.
Brief Desc~iPlion of the Drawinq .
Fig. 1 A schen,dlic, partially cutted ,~p,~:senlaliol1 of the device while in fresh air operation, Fig. 2 a representation acco,di,1g to Fig. 1 while in circulating air ope,alion, Fig. 3,4 a rep, esenldlion accord;. ,9 to Fig. 1 while in dried air ope, dlion with mounted and dismounted air drying device, Fig. 5 a I epresenlalion of the device according to Fig. 2 during the material feeding, Fig. 6,7 an enlarged clipping from Fig. 1 in the area of the reflux valve 22 in closed and opened position, Fig. 8-10 an enlarged clipping in the area of the slide in fresh air-, dried air- and circulating air position, Fig. 11,12 an enla, yed clipping of the device according to Fig. 1 in the area of the outlet of the drying container in feeding- and emptying position.
Detailed Descriotion of the Preferred C",bodil"enlà
The invention will now be desu, il,ed in more detail by eAdl ll,i~lc with rere,unce to the e" ,bo-Jil"e"la shown in the Figures. It should be kept in mind that the f~"~w;ng des~ iL,ed embodiments are only p, esenled by way of eAa" ,p'a and should not necessc(ily be construed as limiting the inventive concept to any particular physical configuration.
The device serves for auto",~Lically feeding a processing machine with pourable material. Its application is especially intended for an injection molding machine to be fed with plastic pellets synthetic powder or materials of cor"pa, able consialence. In the area of the injection molding machine for processing plastic materials a feeding container is provided which constitutes the last part of a feeding pipe 11. In this area the compressed-air applied for conveyance of the material to be processed is carried off into the ~l",osphere by a filter 12 through which the air can penel,~Le but the material to be prc,cessed not. In the device a drying container is provided adapted to supply at least one injection molding machine. The drying container serves in so far as store tank and is in connection with the heated compressed-air generated by a compressed-air generator 13 which in the embodiment is a radial pump. The feeding pipe 11 forks off from the channel 14 for the compressed-air in the area of the drying container 10. In so far the heated cor"pressed-air at the same time serves as feeding means. The compressed-air generator 13 takes in air via an aspiration hole 1 3a. From the channel 14 topped in the co",pressed-air gener~lor in which a heating device 19 is provided a feeding pipe 11 as well as a rising pipeline 20 fork off in the area of a distributor 25.
At the drying container 10 a return pipe 15 is connected which is connectable with the aspiration hole of the compressed-air gene, ~lor for switching into circulating air position. In the area of the aspiration hole 13a of the compressed-air generator 13 a transfer element formed as slide 16 is provided which is L~an~rerable into at least two positions. In so far it is provided with at least two connections 16a 16b wherein the return pipe 15 is connected at one connection 16a and the air treating device as for example an air dryer 17 is connectable at the second connection 16b (Fig. 4 9). If necessary it is however possible to take in fresh air directly from inside the housing (Fig. 8). It goes without saying 2172~13 that the slide also can have three connections, so that the addilional linkage of the conne~;tion 16b with the connection piece 1 7a of the air dryer 17 has not to be realized every time anew.
Inside the housing 18, space R is provided for a" dnge",enl of an air treating device formed as air dryer 17 in the area of the connection piece 1 3a, as can be seen by cu" ,pa, ision of Fig. 1 and 4. The air dryer is an air dehumidifier provided with a silica gel rotor, working continuously, this means the rotor turns pe""al1enlly with a predele""..1ed ~alional speed and thereby passes two zones. In the first zone air taken in from outside having ambient ter"peral.lre is blown through the honeycombed arranged channels of the rotor via a filter and during this process dried by abso,~lion to a low dew point This dried air now has an increased water abso, ~ion capacity and is in this state carried to the fresh air channel of the device. In the second zone the saturated silica gel of the rotor is dried, so that it can continuously be used for the air drying. This self-drying zone 1 7b is fed with heated ambient air, which comes out of the drying device as drawing-off air.
The drying con' ~er 10 has a funnel-shaped section 10a, the outlet of which conn -~!e with the feeding pipe 11 is provided on the side 18a of the housing. The sepa(dlion wall 10c of the drying conlainer divides the housing into two parts, namely into the stock tank on the one hand and into the part co,np~ising the ele~"e,lls required or optionally inleg~a~ 'e for the operation as for eAdlll~lc air drier, control or similar, wherein the stock tank is enla,yed with regard to its volume.
The air stream heated by a heating device 19 at first strikes a drying zone 1Oe in the drying device 10, wherein the air gets into the drying zone by an outlet 1Ob as well as by the rising pipeline 20 with an opening 20a. From the drying zone ~_ 7 the air flows via a biower bottom 1 Od into the upper area of the drying device, the real storage zone, and gets out of it again by a reflux valve 22 provided sufficient pressure is available. The blower bottom is not a separate section anymore as it used to be up to now, but arranged inside the drying container. According to the Figures 6,7 the reflux valve is arranged user-friendly at the end of the return pipe 15 inside the drying container 10 and comprises a valve housing 22a, in which a valve disc 22b, a stud 22c and a spring 22d are arranged, wherein the valve is opened against the force of the spring 22d. The valve spring generates the force for the required pressure for feeding the pellets.
A filter 21 for retention of the material in the drying container, is provided above the valve. Besides, the drying container 10 is made tight by a lid 10f.
The device works as follows:
Figure 1 represents a fresh air operation. The displacement slide 16 is drawn-out, so that the connection 16b of the slide makes possible that fresh air for the compressed-air generator 13 is taken in from inside the housing 18. The lateral channel fan compresses the air taken in, which is heatend in the channel 14 by a heating device 19. A part of the air stream is led directly into the funnel via a rising pipeline 20. The other part of the air stream is led into the feeding pipe area, in order to make possible to determine whether or not further material to be processed has to be fed into the feeding area of the processing machine. That is to say that as soon as no material is available anymore in the area of the filter 12, the feeding stream through the feeding pipe 11 increases, so that material is again blown up to the area of the filter until the openings of the filter are closed by material to be processed in such a way that for a while it is not possible anymore to continue the feeding. With regard to this operating method it can, however, be referred to the DE-PS 24 09 128 mentioned at the beginning.
_ - 8 --The air if necessary heated supplied via the channel 14 and the distributor 25 which llanar~ the air channel to the rising pipeline 20 and the feeding pipe 11 dries the pellets in the funnel. This way the water content of the air rising up increases so that the currently s~rp' ~d material conlained in the drying zone 1 Oe of the drying con~a;. ,er 10 is nearly dry. The enri~ ,ed humid air is carried off into the ambiance through the valve 22. When following the arrows it can be noticed namely that the connection 16b is closed in the area of the slide 16 so that air ~s~ping via the valve 22 and the coarse filter 21 escares from the retum pipe 15 via the opening 15a into the a",biance.
Figure 2 ,e~l esen!s the circulating air operation. In contrast to Figure 1 the slide 16 is rel, d~led so that the conne.;lion 1 6a is in conne~iliol1 with the - ~ .. dtion hole 13a of the co"~ ssed-air gener~lor.
While the air stream through channel 14 and drying container 10 basically remains con:,la"l the air carried back from the return pipe is now supplied again directly to the co~ "essed-air gene(alor.
Losses occuring during this process are co" ~pensdled by an additional air stream e, Itering into the retum pipe 15 via the opening 1 5a.
In Figure 1 and Figure 2 a d la" ,ber R is provided under the separaling wall 1 0c respeclively for arrangement of an air drying device 17 if necessary. This air drying device is rcp,ese"ted in Figure 3 in not mounted condilion and in Figure 4 in mounted condition. If nece~ry it is now possible to connect it to the connection 16b of the slide 16. This way the dry air is taken in by the co"",,~sed-air gene~cLor 13 which is as before led into the drying container by the heating 19 and the distributor 25. In the drying container the air flows as before via the blower bottom 1 Od through the individual areas of the drying container 10. The retum pipe 15 ends as shown in Figure 1 inside the housing wherein the air escap:ng flows out via the opening 15a.
2172~13 g Figure 5 represents the material flux. The material is filled into the funnel for drying. From below the material is dried by the blower bottom 1 Oe, which has a feeding orifice 1 Oe~ by which the material is led through the funnel inclinations into the lower drying zone 1 Oe. From here the material is fed into the injection molding machine by the feeding pipe 11. The division of the housing by the separ~lion wall 1 Oc, due to the arplic~tion of the slide, into stock tank and space for other elements and the so effectable de-coupling from the return pipe 15 makes possible to provide the outlet 10b easily accessible at the side wall 1 8a. In this area an adjusting element 23 is provided, which in one position connects the outlet with the feeding pipe 15 and in an emptying position opens the transport container 10 towards outside (Fig. 12). Basically the material is in connection with a wall 23a, impervious for the material to be processed, however, can be flown through by the compressed-air. In order to transfer the adjusting element from the feeding position into the emptying position, the stop bolt 24 has to be pulled and by a turning of 180 around the vertical axis v-v the wall 23a is transfered into a position according to Figure 12 and no material can get into the distributor 25. The adjusting element 23 is lowered at the same time by the multiturn groove, thus opening the outlet towards outside. In order to create the interior easily access.' Ic, the side walls 18 are made detachable and the control module in drawer-type. In spite of the compact external design, it is possible to adapt the interior of the device to the different customer requ;, ~",e"~ by a modular construction design.
It is self under~lood, that this desc~iplion can be subject to most dirr~r~ modifications, changes and adjustments, being within the area of equivalents as to the claims in the appendix.
DescriPtion of the Prior Art In a feeding device of such a kind according to DE-C 24 09 128 the material to be processed is transported into a feeding area by a heated air pressure stream associated to the injection molding machine wherein in this area the co",presed air can escape via a filter impervious to the material.
The compressed air is at the same time used for drying the material to be processed by carrying the compressed air via a blower bottom to the material wherein the air stream rising upwards absorbs humidity of the material the more the lifting height increases so that clustering of material can be prevented lastingly. The air carried to the drying container streams out of this via a valve provided in the lid into a return pipe or into the atmosphere if the return pipe provided outside the device is not arranged at the aspiration hole of the co",pressed-air generator. In fact the elements of this device are easily accessible due to their a" ~nge" ,ent at the outside however for example the return pipe arranged externally disturbs the handling of the lid when refilling material into the device. The use of supplementary apparatus is basically not inlended and can only be realized under considerab ~ extra expense by arranging exte("ally further components. Since the `
heated air gets into the inferior part of the container by a blower bottom a lot of space is lost inside the housing which on the one hand makes more dimcult a con,pa~;~ construction of the device and on the other hand reduces the volume for the stockable material to be processe~ In case of extreme conditions the air dete"";. ,ed for the conveyance might however be so humidified again that clustering can occur in the feeding pipe.
In the DE-A 14 54 806 a container for pellets is a" anged on a machine s charging shaft in which a fan provides air for drying the material in a middle area of the pellet co"ta;"er. The air can stream out via a con~ , Illy opened conneclion piece which is in pe""aner~l conne tion with a further connection piece by which a part of the air can be re-supplied to the fan. The a"dnge",e, ll of the conneclion piece in contact with the surrounding air has however the disadvantage that also moist air is conslar,lly suctioned. A conveyance of material is not inlended since the material gets into the machine due to the gravilalional force. The return pipe the fan and the element regulating the fresh air or circulating air are a" dnged externally at the container which due to their a, ~ange~ "e, ll at the charging shaft of the machine is less disturbing. Just in case of quick running machines or if several materials are processed however the a"dngel"enl of a material co"~a;ner close to the machine is not desired due to the larger masses to be moved.
From DE-GM 18 96 723 a drying device is known in which a fan for feeding healened air into drying containers arranged above the mount is provided inside the pede:~- ' of a mount. Here the pellets are dried in lots and a reforwarding directly to a " ,ach.. ,e is not i"l.~nded. Due to the a"ange" ,enl of the drying conla,ners above the plane of the plafform sufficient space is available below the mount which is gained by the increased space requirement above the plafform. Since the fan is merely used for drying the material it only takes in the heatend air from the material however has not to gener~le co",pressed air.
SummarY of the Invention Based on this state of the prior art it is an object of the present invention to design a device, ~Ivhich is of the kind described first here,nb~rure, that is easily manageable, compact, adaptable to the different requirell,enls of an injection molding factory and which also meets extreme feeding conditions.
This object is acco,nplisl-ed by the features of claim 1.
In this arrangement a transfer element is provided inside the device. which is llanard~ablc by one manipulation or eventually also automatically into positions in which either fresh air ope, dlion or circulating air operation is realized. That way a co",pacl construction of the device is achieved and acco, ding to the customer's desire a change-over can be effected by merely actuating the transfer element, without the need of additional mounting effort for eAdl "ple for remoYing the return pipe.
Besides, also the basic con.li~ions for i, Iteg, dliol1 or already integrated further elements in a closed housing are created, so that it is easy to cu"espond to the respec~ive cu~lolllela' desires. But also facilitating possibilities for the emptying are created one the one hand by the return pipe arranged inside and the from this resulting undocking of the outlet of the drying con' - ~er for emptying the device. Due to the arrangement of the aspiration hole inside the device, dirt accumulations in the surroundings of the machine do not lessen the drying capability right from the beginning.
If necessary, at the fresh air connection an air treating device as for exdllllJlc an air dryer can be provided, for which, in conl1eulion with the a" dngel "enl of the transfer element, space is available in a protected area inside the housing and ne\,e, ~l leless provides a sufficient quantity of dried air even for the in~eased air throughput when the material to be prucessed is fed, so that also under unfavorable air humidity conditions in humid countries clustering of the material in the feeding pipes is avoided.
The whole drying conlainer according to claim 2 is desiyned in a way, that on the one hand it extends nearly to the bottom of the housing, on the other hand, however, due to a sepa, dlil ,9 wall requires essentially a little more than half of the housing, resulting in a conside,ably inc,eased volume capacity for the material to be p,ucessed.
Brief Desc~iPlion of the Drawinq .
Fig. 1 A schen,dlic, partially cutted ,~p,~:senlaliol1 of the device while in fresh air operation, Fig. 2 a representation acco,di,1g to Fig. 1 while in circulating air ope,alion, Fig. 3,4 a rep, esenldlion accord;. ,9 to Fig. 1 while in dried air ope, dlion with mounted and dismounted air drying device, Fig. 5 a I epresenlalion of the device according to Fig. 2 during the material feeding, Fig. 6,7 an enlarged clipping from Fig. 1 in the area of the reflux valve 22 in closed and opened position, Fig. 8-10 an enlarged clipping in the area of the slide in fresh air-, dried air- and circulating air position, Fig. 11,12 an enla, yed clipping of the device according to Fig. 1 in the area of the outlet of the drying container in feeding- and emptying position.
Detailed Descriotion of the Preferred C",bodil"enlà
The invention will now be desu, il,ed in more detail by eAdl ll,i~lc with rere,unce to the e" ,bo-Jil"e"la shown in the Figures. It should be kept in mind that the f~"~w;ng des~ iL,ed embodiments are only p, esenled by way of eAa" ,p'a and should not necessc(ily be construed as limiting the inventive concept to any particular physical configuration.
The device serves for auto",~Lically feeding a processing machine with pourable material. Its application is especially intended for an injection molding machine to be fed with plastic pellets synthetic powder or materials of cor"pa, able consialence. In the area of the injection molding machine for processing plastic materials a feeding container is provided which constitutes the last part of a feeding pipe 11. In this area the compressed-air applied for conveyance of the material to be processed is carried off into the ~l",osphere by a filter 12 through which the air can penel,~Le but the material to be prc,cessed not. In the device a drying container is provided adapted to supply at least one injection molding machine. The drying container serves in so far as store tank and is in connection with the heated compressed-air generated by a compressed-air generator 13 which in the embodiment is a radial pump. The feeding pipe 11 forks off from the channel 14 for the compressed-air in the area of the drying container 10. In so far the heated cor"pressed-air at the same time serves as feeding means. The compressed-air generator 13 takes in air via an aspiration hole 1 3a. From the channel 14 topped in the co",pressed-air gener~lor in which a heating device 19 is provided a feeding pipe 11 as well as a rising pipeline 20 fork off in the area of a distributor 25.
At the drying container 10 a return pipe 15 is connected which is connectable with the aspiration hole of the compressed-air gene, ~lor for switching into circulating air position. In the area of the aspiration hole 13a of the compressed-air generator 13 a transfer element formed as slide 16 is provided which is L~an~rerable into at least two positions. In so far it is provided with at least two connections 16a 16b wherein the return pipe 15 is connected at one connection 16a and the air treating device as for example an air dryer 17 is connectable at the second connection 16b (Fig. 4 9). If necessary it is however possible to take in fresh air directly from inside the housing (Fig. 8). It goes without saying 2172~13 that the slide also can have three connections, so that the addilional linkage of the conne~;tion 16b with the connection piece 1 7a of the air dryer 17 has not to be realized every time anew.
Inside the housing 18, space R is provided for a" dnge",enl of an air treating device formed as air dryer 17 in the area of the connection piece 1 3a, as can be seen by cu" ,pa, ision of Fig. 1 and 4. The air dryer is an air dehumidifier provided with a silica gel rotor, working continuously, this means the rotor turns pe""al1enlly with a predele""..1ed ~alional speed and thereby passes two zones. In the first zone air taken in from outside having ambient ter"peral.lre is blown through the honeycombed arranged channels of the rotor via a filter and during this process dried by abso,~lion to a low dew point This dried air now has an increased water abso, ~ion capacity and is in this state carried to the fresh air channel of the device. In the second zone the saturated silica gel of the rotor is dried, so that it can continuously be used for the air drying. This self-drying zone 1 7b is fed with heated ambient air, which comes out of the drying device as drawing-off air.
The drying con' ~er 10 has a funnel-shaped section 10a, the outlet of which conn -~!e with the feeding pipe 11 is provided on the side 18a of the housing. The sepa(dlion wall 10c of the drying conlainer divides the housing into two parts, namely into the stock tank on the one hand and into the part co,np~ising the ele~"e,lls required or optionally inleg~a~ 'e for the operation as for eAdlll~lc air drier, control or similar, wherein the stock tank is enla,yed with regard to its volume.
The air stream heated by a heating device 19 at first strikes a drying zone 1Oe in the drying device 10, wherein the air gets into the drying zone by an outlet 1Ob as well as by the rising pipeline 20 with an opening 20a. From the drying zone ~_ 7 the air flows via a biower bottom 1 Od into the upper area of the drying device, the real storage zone, and gets out of it again by a reflux valve 22 provided sufficient pressure is available. The blower bottom is not a separate section anymore as it used to be up to now, but arranged inside the drying container. According to the Figures 6,7 the reflux valve is arranged user-friendly at the end of the return pipe 15 inside the drying container 10 and comprises a valve housing 22a, in which a valve disc 22b, a stud 22c and a spring 22d are arranged, wherein the valve is opened against the force of the spring 22d. The valve spring generates the force for the required pressure for feeding the pellets.
A filter 21 for retention of the material in the drying container, is provided above the valve. Besides, the drying container 10 is made tight by a lid 10f.
The device works as follows:
Figure 1 represents a fresh air operation. The displacement slide 16 is drawn-out, so that the connection 16b of the slide makes possible that fresh air for the compressed-air generator 13 is taken in from inside the housing 18. The lateral channel fan compresses the air taken in, which is heatend in the channel 14 by a heating device 19. A part of the air stream is led directly into the funnel via a rising pipeline 20. The other part of the air stream is led into the feeding pipe area, in order to make possible to determine whether or not further material to be processed has to be fed into the feeding area of the processing machine. That is to say that as soon as no material is available anymore in the area of the filter 12, the feeding stream through the feeding pipe 11 increases, so that material is again blown up to the area of the filter until the openings of the filter are closed by material to be processed in such a way that for a while it is not possible anymore to continue the feeding. With regard to this operating method it can, however, be referred to the DE-PS 24 09 128 mentioned at the beginning.
_ - 8 --The air if necessary heated supplied via the channel 14 and the distributor 25 which llanar~ the air channel to the rising pipeline 20 and the feeding pipe 11 dries the pellets in the funnel. This way the water content of the air rising up increases so that the currently s~rp' ~d material conlained in the drying zone 1 Oe of the drying con~a;. ,er 10 is nearly dry. The enri~ ,ed humid air is carried off into the ambiance through the valve 22. When following the arrows it can be noticed namely that the connection 16b is closed in the area of the slide 16 so that air ~s~ping via the valve 22 and the coarse filter 21 escares from the retum pipe 15 via the opening 15a into the a",biance.
Figure 2 ,e~l esen!s the circulating air operation. In contrast to Figure 1 the slide 16 is rel, d~led so that the conne.;lion 1 6a is in conne~iliol1 with the - ~ .. dtion hole 13a of the co"~ ssed-air gener~lor.
While the air stream through channel 14 and drying container 10 basically remains con:,la"l the air carried back from the return pipe is now supplied again directly to the co~ "essed-air gene(alor.
Losses occuring during this process are co" ~pensdled by an additional air stream e, Itering into the retum pipe 15 via the opening 1 5a.
In Figure 1 and Figure 2 a d la" ,ber R is provided under the separaling wall 1 0c respeclively for arrangement of an air drying device 17 if necessary. This air drying device is rcp,ese"ted in Figure 3 in not mounted condilion and in Figure 4 in mounted condition. If nece~ry it is now possible to connect it to the connection 16b of the slide 16. This way the dry air is taken in by the co"",,~sed-air gene~cLor 13 which is as before led into the drying container by the heating 19 and the distributor 25. In the drying container the air flows as before via the blower bottom 1 Od through the individual areas of the drying container 10. The retum pipe 15 ends as shown in Figure 1 inside the housing wherein the air escap:ng flows out via the opening 15a.
2172~13 g Figure 5 represents the material flux. The material is filled into the funnel for drying. From below the material is dried by the blower bottom 1 Oe, which has a feeding orifice 1 Oe~ by which the material is led through the funnel inclinations into the lower drying zone 1 Oe. From here the material is fed into the injection molding machine by the feeding pipe 11. The division of the housing by the separ~lion wall 1 Oc, due to the arplic~tion of the slide, into stock tank and space for other elements and the so effectable de-coupling from the return pipe 15 makes possible to provide the outlet 10b easily accessible at the side wall 1 8a. In this area an adjusting element 23 is provided, which in one position connects the outlet with the feeding pipe 15 and in an emptying position opens the transport container 10 towards outside (Fig. 12). Basically the material is in connection with a wall 23a, impervious for the material to be processed, however, can be flown through by the compressed-air. In order to transfer the adjusting element from the feeding position into the emptying position, the stop bolt 24 has to be pulled and by a turning of 180 around the vertical axis v-v the wall 23a is transfered into a position according to Figure 12 and no material can get into the distributor 25. The adjusting element 23 is lowered at the same time by the multiturn groove, thus opening the outlet towards outside. In order to create the interior easily access.' Ic, the side walls 18 are made detachable and the control module in drawer-type. In spite of the compact external design, it is possible to adapt the interior of the device to the different customer requ;, ~",e"~ by a modular construction design.
It is self under~lood, that this desc~iplion can be subject to most dirr~r~ modifications, changes and adjustments, being within the area of equivalents as to the claims in the appendix.
Claims (8)
1. Device for feeding a processing machine with material to be processed comprising - a compressed-air generator (13), which takes in air by an aspiration hole (13a) and generates compressed-air, - a drying device (10) arranged in the device, from which the processing machine is feedable via a feeding pipe (11) and wherein the compressed-air leaves the feeding pipe in the area of the processing machine via a filter impervious to the material to be processed, - a channel (14) for the air provided in a drying device (10), from which channel the feeding pipe (11) forks off and from which also air is transferable into the transport container, - a return pipe (15), which is connected at the drying container (10) and is connectable with the aspiration hole (13a) of the compressed-air generator (13) for the circulating air position, characterized in that one transfer element (slide 16) tranferable into at least two positions, with at least one first connection (16a) and at least one second connection (16b), is arranged at the aspiration hole (13a) of the compressed-air generator inside the device, that the retum pipe is connected at the first connection (16a) and in that ambient air for a fresh air operation is absorbable via a second connection (16b) and that space (R) for arrangement of an air dryer (17) is provided inside the housing (18) of the device at the aspiration hole (13a) of the compressed-air generator (13), which makes available a quantity of dried air for drying the material to be processed as well as for feeding the material to be processed.
2. The device according to claim 1 wherein the drying device (10) has a funnel-shaped section (10a), the outlet (10b) of which connectable with the feeding pipe (11) is laid in such a way at the side (18a) of the housing (18), that below a separating wall (10c) dividing the container of the drying container (10) more or less diagonally, the space (R) for arrangement of the air dryer (17) and the return pipe (15), a control of the compressed-air generator (13) and the channel (14) inside the housing (18) is created.
3. The device according to claim 1, wherein an air stream heated by a heating device (19) strikes from below the material to be processed through a blower bottom (10d), which inside the drying device (10) separates a lower drying zone (10e) via a feeding orifice (10e') from the remaining drying device (10).
4. The device according to claim 1, wherein the return pipe (15) arranged inside the housing (18) ends in the drying device (10) and is limited towards the drying device (10) sealed against the atmosphere by a further filter (21) and a reflux valve (22).
5. The device according to claim 1, wherein at an outlet (10b) of the drying device (10) an adjusting element (23) is provided, which in one position connects the outlet with the feeding pipe (15) and in an emptying position opens the drying device (10) towards the outside.
6. The device according to claim 5, wherein the adjusting element (23) is a rotatable adjustment lockable by stopping bolts, a wall (23a) of which turned towards the material is a filter impervious for the material to be processed, which can be cross-flown by the compressed-air.
7. The device according to claim 6, wherein the rotatable adjustment is turnable around a vertical axis (v-v) along a helical nut into the emptying position.
8. The device according to claim 1, wherein the device feeds an injection molding machine for processing plastic materials with pellets.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4335404A DE4335404C2 (en) | 1993-10-18 | 1993-10-18 | Loading device |
| DEP4335404.1 | 1993-10-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2172813A1 true CA2172813A1 (en) | 1995-04-27 |
Family
ID=6500372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002172813A Abandoned CA2172813A1 (en) | 1993-10-18 | 1994-10-11 | Feeding device |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0724512B1 (en) |
| JP (1) | JPH09503712A (en) |
| AT (1) | ATE155064T1 (en) |
| CA (1) | CA2172813A1 (en) |
| DE (2) | DE4335404C2 (en) |
| WO (1) | WO1995011121A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IES79673B2 (en) * | 1998-01-19 | 1998-05-20 | Nypro Research And Development | A method for moulding of hygroscopic plastics material |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1896723U (en) * | 1964-04-07 | 1964-07-16 | Carl Lindstroem Ges M B H | DEVICE FOR HEATING PLASTIC GRANULES. |
| DE2409128C2 (en) * | 1974-02-26 | 1984-11-22 | Karl 7298 Loßburg Hehl | Device for the automatic loading of a processing machine with pourable material |
| FR2311642A1 (en) * | 1975-05-23 | 1976-12-17 | Mecanique Ind Int | Suction fed hopper for preheating injection moulding materials - using hot air drawn via the injection chamber |
-
1993
- 1993-10-18 DE DE4335404A patent/DE4335404C2/en not_active Expired - Fee Related
-
1994
- 1994-10-11 WO PCT/DE1994/001205 patent/WO1995011121A1/en active IP Right Grant
- 1994-10-11 CA CA002172813A patent/CA2172813A1/en not_active Abandoned
- 1994-10-11 EP EP94929462A patent/EP0724512B1/en not_active Expired - Lifetime
- 1994-10-11 DE DE59403328T patent/DE59403328D1/en not_active Expired - Lifetime
- 1994-10-11 JP JP7511173A patent/JPH09503712A/en active Pending
- 1994-10-11 AT AT94929462T patent/ATE155064T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE4335404C2 (en) | 1995-07-20 |
| WO1995011121A1 (en) | 1995-04-27 |
| DE4335404A1 (en) | 1995-04-20 |
| JPH09503712A (en) | 1997-04-15 |
| EP0724512A1 (en) | 1996-08-07 |
| DE59403328D1 (en) | 1997-08-14 |
| EP0724512B1 (en) | 1997-07-09 |
| ATE155064T1 (en) | 1997-07-15 |
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| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |