SI8212092A8

SI8212092A8 - Device for the renewal of tires

Info

Publication number: SI8212092A8
Application number: SI8212092A
Authority: SI
Inventors: Donaldee Brewer
Original assignee: Bandag Inc
Priority date: 1981-09-21
Filing date: 1982-09-20
Publication date: 1995-06-30
Also published as: HRP930315B1; BA97170B1

Description

Naprava za obnavljanje kolesnih plaščevWheel Tire Reconditioner

Področje tehnikeThe field of technology

Izum spada na področje gumarstva, konkretno na področje obnavljanja kolesnih plaščev, še bolj konkretno pa se nanaša na napravo za obnavljanje karkas s predhodno vulkaniziranim protektorjem ob uporabi gibkega tekočinsko tesnega elementa, ki pokriva protektor.The invention relates to the field of rubber, in particular to the field of wheel rim restoration, and more particularly to a device for restoring carcasses with a previously vulcanized tread using a flexible fluid-tight element covering the tread.

V mednarodni razvrstitvi patentov so naprave te vrste uvrščene v razredIn the international patent classification, devices of this type are classified

Tehnični problemA technical problem

Izum je osnovan na problemu, kako zasnovati napravo pri kateri se gibki element pritisne proti protektorju s tlakom tekočine, katerega se aplicira na zunanjost tega elementa, tako da se stisne protektor in karkaso ob uporabi toplote, pri čemer se vulkanizira vezivni medij na osnovi gumija, ki se nahaja med obodno površino karkase in spodnjo površino protektorja, da se bo dalo odpraviti ali vsaj zmanjšati škodljive učinke curljanja tlačne tekočine v prostor med gibkim elementom in sklopom karkase in protektorja.The invention is based on the problem of designing a device in which a flexible element is pressed against a protector by a fluid pressure applied to the exterior of this element by compressing the protector and the carcass using heat, vulcanizing the rubber-based binder, located between the circumferential surface of the carcass and the lower surface of the tread to eliminate or at least reduce the adverse effects of leaking the pressure fluid into the space between the moving member and the carcass and tread assembly.

Stanje tehnikeThe state of the art

Pri obnavljanju kolesnih plaščev je običajno, da odstranijo preostali zrak iz prostora med gibkim elementom in protektorjem ter karkaso. Zrak odstranijo tako, da spravijo vod iz prostora med gibkim elementom in protektorjem v stik z atmosfero ali med ta prostor in vakuumski vir. Gibki element mora biti tekočinsko tesen in se ga pritisne h karkasi, da se izognejo uhajanju tlačne tekočine skozenj ali za gibkim elementom v prostor med protektorjem in karkaso.It is common for wheel rims to remove residual air from the space between the flexible member and the tread and the carcass. Air is removed by bringing the duct out of the space between the moving element and the protector in contact with the atmosphere or between that space and the vacuum source. The flexible element must be fluidly sealed and pressed against the carcass to avoid leakage of the pressure fluid through or behind the flexible element into the space between the tread and the carcass.

Primeri naprav za obnavljanje plaščev zgoraj navedene vrste so podrobno opisani v US patentih št. 2 966 936,Examples of coat restoration devices of the above type are described in detail in U.S. Pat. 2 966 936,

236 709, 3 325 326, 3 745 084, 3 399 551, 3 951 720,236 709, 3 325 326, 3 745 084, 3 399 551, 3 951 720,

075 047 in 4 151 027.075 047 and 4 151 027.

V patentih št. 3 325 326 in 4 151 027 je opisana naprava, s katero dovajajo tlačno tekočino v prostor med gibkim elementom in sklopom karkase in protektorja, da bi tako vzdrževali tlačno razliko med notranjostjo in zunanjostjo gibkega tekočinskega tesnega elementa. Vnaprej doloČe3 no tlačno razliko se vzdržuje z varnostnim ventilom, pregrajenim k vsakemu krovnemu elementu. Ko pritisk prekorači vrednost 1 bar, se ventil odpre, tlačni fluid pa steče iz posode v prostor pod krovnim elementom.In patents no. 3 325 326 and 4 151 027 describes a device by which a pressure fluid is introduced into the space between the flexible element and the carcass and tread assembly in order to maintain the pressure difference between the interior and exterior of the flexible fluid tight element. The predetermined pressure differential is maintained by a safety valve fitted to each roof element. When the pressure exceeds the value of 1 bar, the valve opens and the pressure fluid flows from the tank into the space below the roof element.

Pri tej napravi ni potrebna nikakršna povezava s krovnim elementom in vsak sklop plaščnega ohišja je avtomatsko tlačno krmiljen. Ni pa nikakršne možnosti krmiljenja varnostnega ventila ali odkritja puščanja med gibkim krovnim elementom in preostalim sklopom plašča, sestoječim iz plaščnega ohišja, plaščnega profila in podloge iz sprva nevulkaniziranega gumijastega osnovnega materiala.This device does not require any connection to the roof element, and each casing assembly is automatically controlled by pressure. However, there is no possibility of controlling the safety valve or detecting a leak between the flexible roof member and the rest of the jacket assembly, consisting of a jacket housing, jacket profile and substrate made of initially non-vulcanized rubber base material.

Če npr. varnostni ventil odpove, ni nikakršne tlačne kontrole in po vsej verjetnosti se bo tekalna plast okvarila Če pa pride do puščanja, pa varnostni ventil spet ne bo opravljal svoje vloge. V slednjem primeru pride do tlačne izravnave in ne do tlačne razlike, zaradi česar se tekalna plast loči od ohišja plašča zlasti vzdolž platiščnih robov.If e.g. the safety valve fails, there is no pressure control, and it is likely that the tread will malfunction. However, if a leak occurs, the safety valve will again not perform its role. In the latter case, there is a pressure offset rather than a pressure difference, which causes the tread to be separated from the casing, especially along the rim edges.

Opis rešitve problemaDescription of the solution to the problem

Pri napravi po predloženem izumu zagotovimo avtomatsko tlačno obremenjevanje s tem, da ustvarimo tekočinski tlak v avtoklavu in prostoru med ovojnico in protektorjem na ta način, da vzdržujemo predhodno določeno tlačno razliko med notranjostjo in zunanjostjo gibkega elementa in v primeru pojavljanja tekočinskega tlaka v prostoru avtomatsko popuščanje dobljenega prebitnega tlaka iz prostora.In the apparatus of the present invention, automatic pressure loading is provided by generating fluid pressure in the autoclave and the space between the envelope and the tread in such a way that the previously determined pressure difference between the interior and the exterior of the flexible element is maintained and, in the event of fluid pressure in the space, automatic failure the excess pressure obtained from the room.

V prednostni izvedbi naprave dosežemo tlačno razliko in popuščanje s posebno povezavo med notranjim prostorom avtoklava ali tlačne posode, v kateri je za obnavljanje nameščen sklop gibkega elementa, karkase in protektorja. Gre za vode za dovod tlačne tekočine iz posode v prostor med gibkim elementom in protektorjem pri nižjem tlaku, kot je tlak v posodi. V to napeljavo sta vgrajena tlačni regulator in odzračevalni ventil, ki omogoča popuščanje prebitnega tlaka iz prostora v primeru, ko curlja tekočina iz posode skozi tekočinsko tesni gibki element. Za začetno odstranitev ujetega zraka iz prostora je vgrajen ventil, ki ima prvi položaj, pri katerem je prostor v zvezi bodisi z atmosfero ali z virom vakuuma, drugi položaj, pri katerem je prostor v zvezi z navzdolnjim tlakom tlačnega regulatorja, in tretji položaj, pri katerem je naprava izključena.In a preferred embodiment of the device, a pressure difference and a relaxation are achieved with a special connection between the inner space of the autoclave or the pressure vessel, in which an assembly of a flexible element, a carcass and a tread are mounted for restoration. These are lines for supplying a pressure fluid from the vessel to the space between the flexible element and the tread at a lower pressure than the pressure in the vessel. This installation incorporates a pressure regulator and a vent valve to allow excess pressure to escape from the room when fluid from the tank is leaking through a fluid-tight flexible element. For the initial removal of the trapped air from the room, a valve is installed which has a first position in which the space is in relation to either the atmosphere or a vacuum source, a second position in which the space is in relation to the downstream pressure of the pressure regulator, and a third position, at to which the device is turned off.

Primeri izvedbePerformance examples

Izum bomo nadalje pobliže opisali na osnovi izvedbenih primerov iz priloženih načrtov, v katerih kaže sl. 1 shematski prikaz naprave za obnavljanje plaščev, sl. 2 diagramski prikaz zveze tlaka in časa za vulkanizacijsko cev, komoro in ovojnico, sl. 3 prečni prerez plašča, sl. 4 detajl obkrožene površine s sl. 3, sl. 4A pogled, podoben sl. 4, za alternativno izvedbo plašča sl. 5 shematski prikaz nadaljnje naprave za obnavljanje plaščev, sl. 6 diagramski prikaz tlačne in časovne zveze za komoro in ovojnico, v zvezi z napravo s sl. 5, sl. 7 prečni prerez nadaljnjega plašča v zvezi s sl. 6, sl. 8 detajl iz obkrožene površine s sl. 7, in sl. 8A pogled, podoben sl. 8, nanašajoč se na alternativno izvedbo plašča.The invention will now be further described on the basis of embodiments of the accompanying drawings, in which FIG. 1 is a schematic view of a tire recovery device, FIG. 2 is a diagrammatic representation of the relationship of pressure and time to the vulcanization tube, chamber and envelope; FIG. 3 is a cross-sectional view of the mantle; 4 is a detail of the encircled surface of FIG. 3, FIG. 4A is a view similar to FIG. 4, for an alternative embodiment of the coat of FIG. 5 is a schematic view of a further tire recovery device, FIG. 6 is a diagrammatic view of the pressure and time connection for the chamber and the envelope in connection with the apparatus of FIG. 5, FIG. 7 is a cross-sectional view of the further mantle in connection with FIG. 6, FIG. 8 is a detail from the encircled surface of FIG. 7, and FIG. 8A is a view similar to FIG. 8, referring to an alternative embodiment of the jacket.

Naprava za obnavljanje kolesnih plaščev po sl. 1 obsega tlačno posodo 10, skozi katere pokrov 12 so vloženi plašči 14 za obnavljanje. V notranjosti posode 10 ustvarimo tlak s pomočjo tekočinskega tlačnega vira 16 z inštalirano tlačno linijo 18 z zrakom, vodo, paro ali zmesjo pare in zraka. Medij za ustvarjanje tlaka segrejemo bodisi pred uvajanjem v posodo 10 ali v sami posodi 10 z grelnikom 19. Linija 18 je povezana z regulatorskim ventilom 20, ki uravna tlak in se nato zapre. Skozi linijo 21 za ventilom 20 prehaja tekočina v razdelilno cev 23 za napenjanje plaščev. Tekočina prehaja iz cevi 23 skozi priključne linije 25 v vsakokratno vulkanizacijsko cev 26. Linija 27 za polnjenje tlačne posode 10 je priključena na linijo 21 med ventilom 20 in razdelilno cevjo 23 in speljana k tlačnemu diferencialnemu nepovratnemu ventilu 31, ki se odpre, kadar je tlak v liniji višji od tlaka za ventilom 31. Linija 32 povezuje ventil 31 s tlačnim regulatorskim ventilom 34, ki se zapre, Če tlak v liniji 32 doseže vnaprej določeno vrednost. Linija 35 povezuje ventil 34 s tlačno posodo 10.The wheel tire recovery apparatus of FIG. 1 comprises a pressure vessel 10 through which the recovery casings 14 are inserted. Inside the container 10, pressure is created by means of a liquid pressure source 16 with an installed pressure line 18 with air, water, steam or a mixture of steam and air. The pressure generating medium is heated either before being introduced into the container 10 or into the container 10 itself with the heater 19. Line 18 is connected to a control valve 20 that regulates the pressure and then closes. Liquid is passed through line 21 behind valve 20 into the distributor tube 23 for tensioning the coats. The fluid flows from the pipe 23 through the connecting lines 25 into the respective vulcanization tube 26. The filling tank 10 of the pressure vessel 10 is connected to the line 21 between the valve 20 and the distribution pipe 23 and is directed to a pressure differential non-return valve 31 which opens when the pressure is in line higher than the pressure behind valve 31. Line 32 connects valve 31 to pressure control valve 34 which closes, If the pressure in line 32 reaches a predetermined value. Line 35 connects valve 34 to pressure vessel 10.

Posamezni plašč 14 (sl. 3) obsega karkaso 40, predhodno vulkaniziran protektor 42 in sloj 44 vezivnega materiala na osnovi gumija (tzv. vmesna guma) med spodnjo površino protektorja 42 in vrhnjo površino karkase 40. Gibek tekočinsko tesen krovni element 46 (tzv. ovojnica) je npr. iz gumija in leži nad protektorjem 42. Na sl. 3 je prikazano, da element 46 držimo v tesnilnem stiku s stranskima stenama karkase 40 v vznožju 47. Karkasa 40 je montirana na platišče 49 s prirobnicama 51, ki nalegata na platišče 49- Ovojni element 46 je vkleščen med vsakokratno prirobnico 51 in karkaso 40. Pritisk v vulkanizacijski cevi 26 pritisne ovojni element 46 v zatesnitveni stik s karkaso 40 vzdolž površine ob vznožju 47. Ovojni element 46 je opremljen s fitingom 54, priključenim na vod 58, s pomočjo katerega se ustvari prostor 56 med ovojnim elementom 46 in protektorjem 42. Vodi 58 so speljani skozi tlačno posodo 10 in so povezani z zbirno cevjo 60^ kot je prikazano na sl. 1. V vsakokratni vod 58 je vgrajen ventil 62, ki ima tri položaje: lahko je zaprt, odprt proti zbirni cevi 60 ali pa odprt proti atmosferi.The individual sheath 14 (FIG. 3) comprises a carcass 40, a pre-vulcanized tread 42, and a layer 44 of rubber-based binder material (the so-called intermediate rubber) between the lower surface of the tread 42 and the top surface of the carcass 40. envelope) is e.g. made of rubber and lying above the tread 42. FIG. 3, it is shown that the element 46 is held in sealing contact with the side walls of the carcass 40 at the base 47. The carcass 40 is mounted on the rim 49 with flanges 51 which engage the rim 49- The sleeve element 46 is wedged between the respective flange 51 and the carcass 40. The pressure in the vulcanization tube 26 presses the envelope element 46 into the sealing contact with the carcass 40 along the surface at the base 47. The envelope element 46 is provided with a fitting 54 connected to the conduit 58, which creates a space 56 between the envelope element 46 and the protector 42. The lines 58 are passed through the pressure vessel 10 and are connected to the collecting tube 60 ^ as shown in FIG. 1. In each conduit 58, a valve 62 is provided which has three positions: it may be closed, open to the collecting tube 60 or open to the atmosphere.

Glavnina funkcije naprave je pritisniti protektor 42 proti karkasi 40 s pomočjo tlačne tekočine v posodi 10 in istočasno segreti vezivni sloj 44 na temperaturo vulkaniziranja za povezavo protektorja 42 s karkaso 40.The main function of the device is to press the protector 42 against the carcass 40 by means of a pressure fluid in the container 10 and at the same time heat the bonding layer 44 to the vulcanization temperature to connect the protector 42 with the carcass 40.

Linija 64 povezuje posodo 10 s tlačnim diferencialnim nepovratnim ventilom 66, ki prepušča tekočino v vod 68, kjer tlačna linija 64 doseže vnaprej dan tlak. Linija 68 povezuje ventil 66 s tlačnim regulatorskim ventilom 69, ki je preko linije 71 priključen na zbirno cev 60. Ko začne tlačna tekočina prehajati skozi ventil 66, ostane tlačni regulatorski ventil 69 odprt, dokler tlak v liniji 71 ne doseže zadostne vrednosti. Takrat pa se zapre in ne dopusti, da bi še kaj tlačne tekočine prehajalo v cev 60. Na slednjo je priključen še odzračevalni ventil 73.Line 64 connects the vessel 10 to the pressure differential non-return valve 66, which transfers the fluid to the conduit 68, where the pressure line 64 reaches a pre-given pressure. Line 68 connects valve 66 to the pressure control valve 69, which is connected to the collecting tube 60 via line 71. When the fluid flows through the valve 66, the pressure control valve 69 remains open until the pressure in line 71 reaches a sufficient value. It then closes and does not allow any pressure fluid to flow into the pipe 60. A breather valve 73 is connected to the latter.

Pri odstranjenem pokrovu 12 obesimo v posodo 10 niz plaščev 14, zatem pa linije 25 za napihovanje plaščev priključimo na vulkanizacijske cevi 26 in ovojne elemente 46 priključimo na vode 58. Nato pokrov 12 zapremo in pričvrstimo ter napravo vključimo. Pri startu prehaja tlak iz tekočinskega tlačnega vira 16 skozi linijo 18 v regulatorski ventil. Tlačna tekočina prehaja nato preko linije 21 v razdelilno cev 23 za napihovanje plaščev 14. Istočasno tlak prehaja tudi v polnilno linijo 27. Diferencialni nepovratni ventil 31 se ne odpre, dokler tlak v liniji 21 ne doseže vnaprej nastavljene vrednosti. Takrat vulkanizacijska cev ustvari tlak znotraj karkase 40, komora 10 pa je pod atmosferskim tlakom. Diferencialni ventil 31 se odpre in prepušča tlak v linijo 32, ki prepušča tlak skozi tlačni regulatorski ventil 34 v linijo 35, ki nato tega prepusti v notranjost tlačne posode 10. Pri določenem tlaku komore 10 in višjem tlaku v liniji 64 se diferencialni nepovratni ventil 66 odpre in začne prepuščati tlačno tekočino preko linije 68 skozi ventil 69 v linijo 71 in nato v cev 60 ter skozi vode 58 v ovojnice 46. To se nadaljuje, dokler tlak v vulkanizacijski cevi 26 ne doseže določene vrednsti. Takrat je tlak v komori 10 višji in tlačni regulatorski ventil 34 se zapre. Tlak v cevi 60 je tedaj nižji in tlačni regulatorski ventil 69 se zapre. Naprava je stabilizirana in vulkanizacijski ciklus se začne.When the cover 12 is removed, a set of coats 14 is hung in the container 10, and then the tire inflation lines 25 are connected to the vulcanization tubes 26 and the enclosing elements 46 are connected to the water 58. Then the cover 12 is closed and secured and the device is switched on. At start, the pressure from the fluid pressure source 16 passes through line 18 into the control valve. The pressure fluid then passes through line 21 into the manifold 23 for inflating the casings 14. At the same time, the pressure also flows into the filling line 27. The differential non-return valve 31 does not open until the pressure in line 21 reaches a preset value. At that time, the vulcanization tube generates pressure inside the carcass 40 and the chamber 10 is under atmospheric pressure. The differential valve 31 is opened and pressurized into line 32, which passes pressure through the pressure control valve 34 into line 35, which then passes it to the inside of the pressure vessel 10. At a certain chamber pressure 10 and higher pressure in line 64, the differential non-return valve 66 opens and begins to flow the pressure fluid through line 68 through valve 69 into line 71 and then into pipe 60 and through water 58 into envelopes 46. This is continued until the pressure in the vulcanization tube 26 reaches a certain value. At that time, the pressure in the chamber 10 is higher and the pressure control valve 34 closes. The pressure in the pipe 60 is then lower and the pressure control valve 69 closes. The device is stabilized and the vulcanization cycle begins.

Na sl. 2 je to grafično prikazano glede na tlak in čas. Vulkanizacijsko cev 26 napihujemo približno 25 minut 5 na nivo 2.10 Pa. Takrat se začne komora 10 polniti in ko 5 doseže 10 Pa, je vulkanizacijska cev 26 približno pri 2,8.10⁵ Pa.In FIG. 2 shows this graphically in terms of pressure and time. Inflate tube 26 for about 25 minutes 5 to level 2.10 Pa. At that point, chamber 10 begins to fill and when 5 reaches 10 Pa, the vulcanization tube 26 is at about 2.8.10 ⁵ Pa.

Nato začne ovojnica 46 sprejemati tlak. To se na ta način nadaljuje približno 60 minut, ko je vulkanizacijska cev 26Then the envelope 46 receives pressure. This is continued in this way for about 60 minutes when the vulcanization tube is 26

5 pri 8.10 Pa, tlak komore 5,86 Pa in tlak ovojnice 4,8.105 at 8.10 Pa, chamber pressure 5.86 Pa and envelope pressure 4.8.8

Pa.Well.

Če bi med vulkanizacijskim ciklom kadarkoli eden od plaščev 14 puščal pri tekočinsko tesnem ovojnem elementu 46,bi zrak prehajal iz komore 10 v prostor 56 ovojnice in nato skozi vod 58 v cev 60. Tlak ne bi mogel iti skozi tlačni regulatorski ventil 69; če pa je puščanje resno, se odpre odzračevalni ventil 78. Če gre za velik curek zraka, lahko delavec to kontrolira in s pomočjo ventila 62 določi, kateri plašč pušča. Če je poškodba prehuda, lahko odpre prizadeti plašč proti atmosferi, s čimer prepreči kakršnokoli poškodbo drugih plaščev v napravi. Če npr. ni plašča na posameznem mestu, lahko ventil 62 zapremo.If during one of the vulcanization cycles one of the sheaths 14 leaked at the fluid-tight envelope element 46, air would pass from the chamber 10 to the space 56 of the envelope and then pass through the conduit 58 into the tube 60. The pressure could not pass through the pressure control valve 69; however, if the leak is serious, the vent valve 78 opens. In the case of a large jet of air, the worker can control this and determine, by means of valve 62, which jacket is leaking. If the damage is severe, it can open the affected coat against the atmosphere, preventing any damage to the other coatings in the device. If e.g. there is no jacket in a single place, valve 62 can be closed.

V primeru plašča po sl. 4A je med protektorjem 42 in ovojnico 46 uporabljen stenjast material 75, ki omogoči lahek pretok tekočine v prostor 56 ovojnice in iz njega. Stenjast material 75 naj bo položen po vsej površini protektorja 42, začenši pri vezivnih linijah 76 na obeh straneh karkase 40.In the case of the coat of FIG. 4A, a wall material 75 is used between the tread 42 and the envelope 46 to allow the fluid to flow easily into and out of the envelope space 56. The wall material 75 should be laid over the entire surface of the tread 42, starting at the connecting lines 76 on either side of the carcass 40.

Alternativna izvedba naprave po izumu je prikazana na sl. 5. Imamo tlačno posodo 110 s pokrovom 112. Znotraj avtoklava 110 so nameščeni kolesni plašči 114. Tekočinski tlačni vir 116 je preko tlačne linije 118 povezan s tlačnim regulatorskim ventilom 120. V komori 110 je nameščen grelnik 119. Tlačni regulatorski ventil 120 je priključen na komoro 110 z linijo 121.An alternative embodiment of the device according to the invention is shown in FIG. 5. We have a pressure vessel 110 with a lid 112. Inside the autoclave 110 there are wheel rims 114. The fluid pressure source 116 is connected via a pressure line 118 to a pressure control valve 120. The chamber 110 has a heater 119. The pressure control valve 120 is connected to chamber 110 with line 121.

Plašč 114 (sl. 7) sestoji iz karkase 140 in predhodno vulkaniziranega protektorja 142. Vezivni material 144 je nameščen med predhodno vulkaniziranim protektorjem 142 in karkaso 140 in veže protektor na karkaso. Gibek, tekočinsko tesen ovojni element 146 pokriva zunanji del, notranja ovojnica 146A pa pokriva notranji del. Zatesnitev med ovojnicama je izvedena pri prekritju 147. Zato je tlak znotraj komore enak tlaku v karkasi in izven nje ter pritiska ovojnici 146 in 146A proti karkasi, kot je prikazano na sl. 7. Fiting 154 je priključen na vod 158, ki je priključen na razdelilno cev 160. Vzdolž voda 158 je nameščen ventil 162, ki ima tri položaje: lahko je v zvezi z atmosfero, lahko je zaprt ali povezuje ovojnico s cevjo 160. Linija 164 poteka od tlačne komore 110 do tlačnega diferencialnega nepovratnega ventila 166. Linija 168 povezuje nepovratni ventil 166 s tlačnim regulatorskim ventilom 169, ki je priključen na cev 160 z linijo 171. Na linijo 171 je priključena vakuumska črpalka 172. Na :cev,l60 je priključen odzračevalni ventil 173·The sheath 114 (Fig. 7) consists of a carcass 140 and a previously vulcanized protector 142. The binder 144 is positioned between the previously vulcanized protector 142 and the carcass 140 and binds the protector to the carcass. A flexible, fluid-tight wrapper 146 covers the outer portion, and the inner wrapper 146A covers the inner portion. The sealing between the envelopes is done at overlap 147. Therefore, the pressure inside the chamber is equal to the pressure inside and outside the carcass and the pressure of the envelope 146 and 146A against the carcass, as shown in FIG. 7. Fitting 154 is connected to conduit 158, which is connected to manifold pipe 160. Along the conduit 158, a valve 162 is provided which has three positions: may be in relation to the atmosphere, may be closed or connect the envelope to tube 160. Line 164 runs from pressure chamber 110 to pressure differential non-return valve 166. Line 168 connects non-return valve 166 to pressure control valve 169, which is connected to pipe 160 by line 171. A vacuum pump 172. is connected to line 171. To: pipe, l60 is connected vent valve 173 ·

Ta naprava deluje tako, da vložimo plašče 114 v tlačno posodo 110 in ovojnico z vodom 158 priključimo na cev 160. Potem, ko smo plašče 114 povezali ter pokrov 112 zaprli in pričvrstili, odpremo vakuumsko črpalko 172 proti liniji 171 in tlačni regulatorski ventil 169 se zapre.This device works by inserting the casing 114 into the pressure vessel 110 and connecting the envelope with conduit 158 to the tube 160. After the coats 114 have been connected and the lid 112 closed and secured, the vacuum pump 172 toward line 171 and the pressure control valve 169 are opened. close.

Vakuumska črpalka ustvarja podtlak na cevi 160. To izvaja tlak na plašče 114, ki drži ovojnici 146 in 146A v stiku s karkaso 140. Tekočinski tlačni vir 116 se odpre in spušča tlačno tekočino skozi tlačno linijo 118 do tlačnega regulatorskega ventila 120, ki nato spusti tekočinski tlak skozi linijo 121 v komoro 110. Ko tlak v komori 110 doseže določeno vrednost, vakuumsko črpalko zapremo in tlačni regulatorski ventil 169 se odpre. Takrat se tlak ovojnice spremeni od podtlaka do atmosferskega ali ničelnega tlaka.The vacuum pump generates pressure on pipe 160. This exerts pressure on the sheaths 114, which holds the envelopes 146 and 146A in contact with the carcass 140. The fluid pressure source 116 opens and drains the pressure fluid through the pressure line 118 to the pressure control valve 120, which then drops liquid pressure through line 121 into chamber 110. When the pressure in chamber 110 reaches a certain value, the vacuum pump is closed and the pressure control valve 169 opens. This is when the envelope pressure changes from underpressure to atmospheric or zero pressure.

V predloženem prikazu (sl. 6) držimo tlak komore 5 pri 10 Pa približno 30 minut, medtem ko temperatura v komori naraste na 71 °C. Ko temperatura doseže npr. 71 °C, se ventilIn the present embodiment (Fig. 6), the pressure of the chamber 5 is kept at 10 Pa for about 30 minutes, while the temperature in the chamber is raised to 71 ° C. When the temperature reaches e.g. 71 ° C, is the valve

120 spet odpre in takrat vzdržujeta ovojnica in komora tlačno - 5 razliko približno 10 Pa,nato pa traja okoli 15 minut, da v komori naraste tlak na 5,86.10 Pa, ko se tlačni regulatorski ventil 120 zapre.120 opens again and then the envelope and chamber are maintained at a pressure difference of about 10 Pa, then take about 15 minutes to increase the pressure in the chamber to 5.86.10 Pa when the pressure regulator valve 120 closes.

Če bi med vulkanizacijo katerakoli od ovojnic 114 puščala, se odzračevalni ventil 173 odpre proti atmosferi, χShould any of the envelopes 114 leak during vulcanization, the vent valve 173 opens to the atmosphere, χ

ko tlak v cevi 160 doseže 5,4.10 Pa. Ce gre za močno izhajanje, lahko delavec pregleda ventile 162, da najde plašč, ki povzroča problem, ter ga bodisi odpre proti atmosferi ali napravo izključi in s tem prepreči, da bi poškodovana ovojnica 146 vplivala na druge plašče. Glede na sl. 6 je prikazana ovojnica na začetku vulkanizacije pri vakuumu 711,2 mm. Približno 15 minut v ciklu, ko tlak v komori naraste na 10⁵ Pa, vakuum izključimo in protitlak ovojnice gre na nič.when the pressure in the pipe 160 reaches 5.4.10 Pa. In the event of a strong outlet, the worker can inspect the valves 162 to find the cause of the problem and either open it to the atmosphere or switch off the device, thereby preventing the damaged envelope 146 from affecting other coats. According to FIG. 6 shows an envelope at the beginning of vulcanization at a vacuum of 711.2 mm. About 15 minutes into the cycle when the pressure in the chamber rises to 10 ⁵ Pa, the vacuum is switched off and the envelope back pressure goes to zero.

To stanje se vzdržuje, kot je navedeno zgoraj, samo približno 30 minut, ko krivulja prikazuje napredovanje sistema do vulkanizaci jskih pogojev, ko je tlak komore 5,86 Pa in protitlak ovojnice 4,8.10^ Pa.This condition is maintained as indicated above for only about 30 minutes when the curve shows the progression of the system to vulcanization conditions, when the chamber pressure is 5.86 Pa and the envelope back pressure is 4.8.10 ^ Pa.

Sl. 8 kaže stanje ovojnice 146 s protektorjem 142 ter vezivno linijo 176 in karkaso 140, podobno sl. 4. Na sl. 8A pa je prikazan stenjast material 175, ki ga lahko alternativno uporabimo, pri čemer ga namestimo med ovojnico 146 in protektor 142, kar omogoča, da se zrak odvede skozenj in nato skozi fiting 154 v vod 158, podobno sl. 4A. Stenjasti material se razteza do izpod vezivnih linij 176 od ene strani plašča 114 do druge.FIG. 8 shows the state of the envelope 146 with a protector 142 and a binding line 176 and a carcass 140 similar to FIG. 4. In FIG. 8A shows a wall material 175 that can be used alternatively by being placed between the envelope 146 and the protector 142, which allows air to be drawn through and then through the fitting 154 into the conduit 158, similar to FIG. 4A. The rock material extends below the binding lines 176 from one side of the sheath 114 to the other.

Navedba najboljšega načina za gospodarsko izkoriščanje izumaAn indication of the best way to make economic use of the invention

Napravo smotrno konstruiramo za vnaprej določeno velikost in število kolesnih plaščev, čeprav je načeloma možna tudi izvedba, v katero bi se dalo spraviti tudi najtežje plašče, ki se jih v praksi sploh obnavlja, pa bi nato v njej obnavljali tudi manjše plašče.It is expedient to design the device for a predetermined size and number of wheel tires, although in principle it is also possible to carry in which even the heaviest tires, which are practically renewed, could be put into place and then smaller tires would also be renewed there.

Osnova za dimenzioniranje elementov naprave je podana v diagramih sl. 2 in 6 iz prijave. V tlačni liniji 18 naj bo vzpostavljen tlak približno 10^ Pa. Regulatorski ventil 20 naj bo odprt do tlaka 8.10 Pa, do katerega naj se napihne 5 plasc. Ventil 31 naj se odpre pri tlaku 2.10 Pa nad tlakom za ventilom 31, ventil 34 pa naj se zapre pri tlaku linije 32 na vrednosti 5,86.10^ Pa.The basics for sizing the device elements are given in the diagrams of FIG. 2 and 6 of the application. A pressure of about 10 ^ Pa should be established in pressure line 18. The control valve 20 should be opened up to a pressure of 8.10 Pa, to which 5 layers should be inflated. Valve 31 should be opened at a pressure of 2.10 Pa above the pressure behind valve 31, and valve 34 should be closed at a pressure of line 32 at a value of 5.86.10 ^ Pa.

Za napihovanje karkase so podani napotki v US-PSInstructions for inflating the carcass are provided in US-PS

075 047.075 047.

V tlačni liniji 64 naj bo vzpostavljen tlak 10 Pa. Regulatorski ventil 69 naj bo odprt do tlaka v liniji 71 na vrednosti 4,8.10 Pa. Ventil 31 pa se odpre pri tlaku v li_w 5 niji 21 na višini 2.10 Pa.The pressure line 64 should be pressurized to 10 Pa. Regulator valve 69 should be open to the pressure in line 71 at 4.8.10 Pa. The valve 31 opens at a pressure in the Li _w 5 niji 21 at a height of 2.10 Pa.

Glede materialov, obdelave in montaže niso potrebna nobena posebna znanja in navodila.No special knowledge and instructions are required regarding materials, processing and assembly.

ZaFor

Bandag Incorporated:Bandag Incorporated:

Claims

PATENT APPLICATIONS

CLAIMS 1. Wheel retreading device comprising a heated pressure vessel 10, 110 for receiving at least one wheel housing 14, 114 consisting of a carcass 40, 140, a previously vulcanized rubber tread 42, 142, layers 44, 144 of a vulcanizing base rubber material, filed between the tread and the carcass, and against the air of the tight wrapping element 46; 146, l46a for contracting the tread and at least adjacent side walls of the casing, with a fitting 54, 154 fitted to supply the pressure fluid from the container 10, 110 to the space 56, 156 under the wrapping element 46, 146, and the pressure differential non-return valve 66, 166 between the container 10, 110 and the fitting 54, 154 to maintain a predetermined pressure difference between the container 10, 110 and the space 56, 156, characterized in that the container (10, 110) is connected to the wheel wrapping elements (46, 146) casing (14, 114) connected distributor tube (60, 160) disposed outside the container (10, 110) via a non-return valve (66, 166) and each fitting (54, 154) connected to the distributor tube (60, 160) ) via a pipe line (58, 158).

Apparatus according to claim 1, characterized in that a pressure control valve (69, 169) is incorporated into the conduit (68, 168; 71, 171) between the non-return valve (66, 166) and the distribution tube (60, 160). .

- lif

Apparatus according to claim 1 or 2, characterized in that a vent valve (73, 173) is connected to the distribution pipe (60, 160).

Device according to one of Claims 1 to 3, characterized in that a three-way valve (62, 162) is installed in each pipe line (58, 158) between the distribution pipe (60, 160) and the individual fitting (54, 154) .