SI20312A

SI20312A - Stopper rod

Info

Publication number: SI20312A
Application number: SI9820076A
Authority: SI
Inventors: Kassim Juma; Gerhard Langner
Original assignee: Foseco International Limited
Priority date: 1997-11-27
Filing date: 1998-11-10
Publication date: 2001-02-28
Also published as: JP2001524390A; SK7842000A3; PL340737A1; HUP0100367A2; KR20010032488A; EP1034060A1; TR200001531T2; YU32200A; TW404870B; WO1999028066A1; CA2311907A1; CN1284019A; AU1044699A; AR017675A1; BG104475A; HUP0100367A3; BR9814899A

Abstract

The invention provides an improved stopper rod which is made by a method in which a composition to form the body of the stopper rod is charged into a mould (10), a removable core (12) being positioned in the mould (10) to form a longitudinally-extending bore (31, 41) in the stopper rod body, an externally-threaded removable insert (16) being positioned in the mould in correspondence core (12) to form an internal thread (37, 43) on a portion of the bore and a plate (18) being positioned in the mould to define a flat upper end (35, 40A) of the stopper rod body, characterised in that a spacer (22) is positioned between the externally-threaded insert (16) and the plate (18) whereby the internal thread (37, 43) in the bore (31, 41) of the stopper rod body is formed spaced from the upper end (35, 40A) of the body when the composition is pressed in the mould. The invention also provides a mould in which to make the improved stopper rod.

Description

Predmetni izum se nanaša na mašilni drog in na sredstva za izdelavo izboljšanega mašilnega droga.The present invention relates to a stopper rod and to means for making an improved stopper rod.

Stanje tehnikeThe state of the art

Mašilni drogovi ali zamaški so dobro poznani pri uporabi za nadzor toka staljene kovine iz posode, na primer iz livarskih posod v kalupe. Mašilni drog dvigamo in spuščamo s pomočjo primernega mehanizma, ki se nahaja poleg posode in ga na ta način lahko uporabimo tako, da popolnoma ali delno zapremo ali popolnoma odpremo iztočno odprtino in tako nadzorujemo tok kovine iz posode.Grease rods or stoppers are well known in their use to control the flow of molten metal from vessels, such as from casting vessels to molds. The lifting rod is lifted and lowered by means of a suitable mechanism located next to the tank and thus can be used to completely or partially close or completely open the outlet opening to control the flow of metal from the tank.

Običajno je mašilni izdelan kot podolgovat enodelen aluminijevo - grafitni sestavek spojen z izostatičnim stiskanjem v primernem kalupu. Mašilni drog je običajno votel in je običajno izdelan tako, da ima vzdolžno centralno odprtino, izdelano s pomočjo odstranijivega jedra. Spodnji konec luknje v mašilnem drogu je lahko zaprt ali pa odprt, da je omogočen odvod plinov, na primer argona, skozi drog.Typically, the sealing compound is made as an elongated one-piece aluminum-graphite composition coupled by isostatic pressing in a suitable mold. The stirrup rod is usually hollow and is usually constructed to have a longitudinal central opening made by means of a removable core. The lower end of the hole in the seal rod may be closed or open to allow gases, such as argon, to be passed through the rod.

Mašilni drog torej običajno izdelamo tako, da željeni aluminijevo-grafitni sestavek namestimo okoli odstranijivega jedra v razstavljivem kalupu. Razstavljivi kalup nato damo v rezervoar s tekočino, na primer z vodo in z znanimi sredstvi povečamo vodni tlak do vrednosti, pri kateri aluminijevo-grafitni sestavek preide v samonosilno strukturo. Po odstranitvi izostatično stisnjenega izdelka iz kalupa, odstranimo še jedro in tako dobimo votel mašilni drog.The stirring rod is therefore usually made by placing the desired aluminum-graphite composition around the removable core in a disassembled mold. The disassemble mold is then placed in a fluid reservoir, for example with water, and by known means increasing the water pressure to a value at which the aluminum-graphite composition becomes a self-supporting structure. After removal of the isostatically pressed product from the mold, the core is removed and a hollow seal rod is obtained.

Na zgornjem koncu mora mašilni drog imeti sredstva, na katere lahko namestimo mehanizem za dviganje in spuščanje.At the upper end, the sealing bar must have means on which the lifting and lowering mechanism can be fitted.

Predlagane so bile številne rešitve, vključno z istočasnim stiskanjem navojne puše v zgornji del mašilnega droga za namestitev navojnega vretena; izdelavo zgornjega konca votlega dela mašilnega droga z notranjim navojem za namestitev keramičnega ali kovinskega vložka in vstavitev fiksirnega zatiča skozi soležni luknji, zvrtani skozi mašilni drog in pritrdilni drog.A number of solutions have been proposed, including simultaneous compression of the threaded sleeve into the upper part of the sealing bar to accommodate the threaded spindle; making the upper end of the hollow part of the sealing rod with an internal thread for mounting a ceramic or metal insert and inserting a fixing pin through the holes through the sealing rod and the retaining rod.

Kratek opis izumaBRIEF DESCRIPTION OF THE INVENTION

V predmetni izvedbi, kjer je zgornji konec luknje mašilnega droga izdelan z notranjim navojem, kamor namestimo vložek, to običajno dosežemo s pozicioniranjem okroglega vložka z zunanjim navojem v kalup na primerno mesto, da dosežemo oblikovanje notranjega navoja na delu luknje v mašilnem drogu, ki poteka od zgornjega začetka omenjene luknje. Ugotovili pa smo, da ima lahko taka rešitev za posledico številne težave.In the present embodiment, where the upper end of the puncture hole is made with an inner thread where the insert is mounted, this is usually achieved by positioning the round insert with the outer thread in the mold in a suitable place to achieve the formation of an inner thread on the part of the hole in the extending rod from the top of the hole mentioned above. However, we have found that such a solution can have many problems.

V stisnjenem telesu mašilnega droga se lahko na primer pojavijo razpoke. Te lahko odkrijemo po odstranitvi orodja s stisnjenega izdelka, vendar pa nekatere lahko opazimo šele po tem, ko stisnjeni izdelek žgemo. Druge razpoke, ki nastanejo znotraj izdelka, pa lahko odkrijemo samo s pomočjo X žarkov. V vseh takih primerih prisotnost razpok vodi do razpadanja dragega izdelka. Poleg tega imajo lahko taki mašilni drogovi nizko torzijsko trdnost, ki je potrebna pri pritrjevanju mašilnega droga na pritrjevalni mehanizem, lahko slabo delujejo, zaradi na primer loma ali pri relativno nizki torzijski obremenitvi ali med transportom po montaži in lahko se zgodi, da med uporabo odpovedo.For example, cracks may occur in the compressed body of the sealing rod. These can be detected after removal of the tool from the compressed product, but some can only be observed after burning the compressed product. Other cracks that occur inside the product can only be detected by X-rays. In all such cases, the presence of cracks leads to the dissolution of an expensive product. In addition, such sealing rods may have the low torsional strength required when attaching the sealing rod to the mounting mechanism, may have poor performance, for example, due to fracture or relatively low torsional loading or during transport after assembly, and may fail during use. .

Opis izumaDescription of the invention

Namen predmetnega izuma je zagotoviti izboljšana sredstva za izdelavo mašilnega droga, ki ima telo z notranjim navojem, torej namerava zagotoviti tudi izboljšan mašilni drog.It is an object of the present invention to provide improved means for the manufacture of a sealing rod having a body with an internal thread, and therefore it is intended to provide an improved sealing rod.

Torej z enega vidika predmetni izuma zagotavlja metodo izdelave mašilnega droga, kjer s sestavkom za oblikovanje napolnimo model, odstranljivo jedro pozicioniramo v model, da v telesu mašilnega droga oblikujemo vzdolžno luknjo, vložek z zunanjim navojem pozicioniramo v model glede na odstranljivo jedro, da oblikujemo notranji navoj na delu odprtine, ploščo pa pozicioniramo v model da definiramo ravni zgornji del telesa mašilnega droga, kjer med vložkom z zunanjim navojem in omenjeno ploščo namestimo distančnik in tako oblikujemo notranji navoj v luknji mašilnega droga na določeni razdalji od zgornjega konca telesa, ko sestavek stisnemo v kalup. Izraz »zgornji del« mašilnega droga se nanaša na mašilni drog v delovnem položaju.Thus, in one aspect, the present invention provides a method of manufacturing a rod, wherein a molding composition is filled with a model, a removable core is positioned in a model, a longitudinal hole is formed in the body of a rod, and an insert with an external thread is positioned in the model with respect to a removable core to form an inner the thread is part of the opening and the plate is positioned in the model to define a flat upper body of the seal rod, where a spacer is placed between the insert with the outer thread and said plate, thus forming an inner thread in the hole of the seal rod at a certain distance from the upper end of the body when the composition is pressed into the mold. The term "upper end" of the sealing rod refers to the sealing bar in the working position.

V drugi izvedbi predmetni izum zagotavlja kalup za izdelavo mašilnega droga, kjer omenjeni kalup vsebuje odstranljivo jedro, ki odgovarja želeni odprtini v telesu, zunanji del kalupa, oziroma oklep, ki odstranljivo jedro obkroža in tako definira obliko votline, kjer bo telo oblikovano, odstranijivi vložek z zunanjim navojem katerega lahko pritrdimo v kalup glede na jedro, da dobimo notranji navoj na delu bodoče luknje, ploščo katero pozicioniramo v kalup da definiramo raven zgornji del telesa in distančnik, katerega pozicioniramo med vložek z zunanjim navojem in omenjeno ploščo, kjer bo notranji navoj v luknji mašilnega droga na določeni razdalji od zgornjega konca telesa.In another embodiment, the present invention provides a mold for producing a sealing rod, wherein said mold comprises a removable core corresponding to a desired opening in the body, an outer portion of the mold, or armor surrounding the removable core to define the shape of the cavity where the body will be formed, a removable insert. with an external thread which can be attached to the mold relative to the core to obtain an inner thread on a part of a future hole, a plate which is positioned in the mold to define a straight upper body and a spacer positioned between the insert with an outer thread and said plate where the inner thread will be in the hole of the prop rod at some distance from the upper end of the body.

Torej bo razdalja, za katero je notranji navoj pomaknjen v notranjost luknje, enaka debelini distančnika.So the distance by which the inner thread is displaced to the inside of the hole will be equal to the thickness of the spacer.

V naslednji izvedbi izum zagotavlja mašilni drog, ki ima telo oblikovano s pomočjo kalupa omenjenega v prejšnjih odstavkih. Izum torej zagotavlja tudi mašilni drog s telesom, ki vsebuje vzdolžno luknjo, ki je na zgronjem ravnem delu telesa odprta in ima notranji navoj, ki je od zgornje ploskve telesa odmaknjen.In another embodiment, the invention provides a sealing rod having a body shaped by the mold mentioned in the preceding paragraphs. The invention therefore also provides a sealing rod with a body comprising a longitudinal hole which is open in the upper flat part of the body and has an internal thread which is offset from the upper surface of the body.

Ko mašilni drog po predmetnem izumu pritrjujemo na mehanizem za dviganje in spuščanje, lahko okroglo odprtino ki ostane na zgornjem delu luknje v mašilnem drogu, po odstranitvi distančnika, napolnimo s cementom okoli dela mehanizma za dviganje in spuščanje, ki poteka skozi odprtino, ko en konec mehanizma privijemo v navojni del luknje. Prednostno lahko v to votlino damo keramični obročWhen attaching the lifting rod of the present invention to the lifting and lowering mechanism, the circular opening remaining on the upper portion of the hole in the lifting rod may, after removal of the spacer, be filled with cement around a portion of the lifting and lowering mechanism passing through the opening when one end screw the mechanism into the threaded part of the hole. Preferably, a ceramic ring can be placed into this cavity

Priključitev mehanizma za dviganje in spuščanje lahko olajšamo z lažjim in bolj natančnim centriranjem pritrdilnega droga, poleg tega pa je tudi tesnjenje boljšeThe connection of the lifting and lowering mechanism can be facilitated by easier and more precise centering of the mounting rod, as well as making the sealing better

Keramični obroč lahko izdelamo iz enakega materiala kot mašilni drog, čeprav to ni bistveno.The ceramic ring can be made of the same material as the seal rod, although this is not essential.

Osnovna sredstva uporabljena za oblikovanje mašilnega droga po predmetnem izumu so lahko katerakoli običajna sredstva in so torej lahko tudi uporabljene tudi običajne metode izostatičnega stiskanja v deformabilnem kalupu. Oklep kalupa je torej lahko deformabilen, kot je opisano zgoraj.The fixed means used to form the propellant rod of the present invention may be any conventional means and therefore conventional methods of isostatic compression in a deformable mold may also be used. Molding armor can therefore be deformable as described above.

Spodnji konec mašilnega droga je lahko zaprt ali odprt, da je omogočen prehod plinov, na primer argona.The lower end of the sealing rod may be closed or open to allow the passage of gases, such as argon.

Navojni vložek ima lahko obliko polnega cilindra ali cilindričnega obročka. Lahko je izveden tako, da ga je možno pritrditi na en konec odstranijivega jedra ali pa je oblikovan kot podaljšek jedra tako, da ga v kalup lahko vstavimo v enem delu z jedrom.The threaded insert may be in the form of a full cylinder or cylindrical ring. It can be made so that it can be attached to one end of the removable core or it can be shaped as an extension of the core so that it can be inserted into the mold in one part with the core.

Jasno je da bo distančnik imel debelino, ki bo odgovarjala želeni razdalji začetka navojnega dela luknje od zgornjega konca telesa droga. Distančnik ima lahko na primer debelino od 10 do 50 mm, čeprav se lahko pokaže, da je debelina distančnika izven tega obsega, v določenih okoliščinah, primerna. Lahko ga pritrdimo na navojni vložek s pomočjo katerihkoli običajnih sredstev.It is clear that the spacer will have a thickness that corresponds to the desired distance of the beginning of the threaded portion of the hole from the upper end of the rod body. For example, the spacer may have a thickness of 10 to 50 mm, although the spacer thickness outside this range may prove appropriate in certain circumstances. It can be secured to the threaded insert by any conventional means.

Distančnik je prednostno izdelan iz kovine, na primer jekla, lahko pa je izdelan iz kateregakoli primernega, na primer keramičnega, materiala.The spacer is preferably made of metal, such as steel, but may be made of any suitable material, such as ceramic, for example.

Vložek z notranjim navojem je lahko tak, kot se običajno uporablja. Torej je lahko na primer iz jekla, zunanjega premera od 50 do 150 mm in dolžine od 25 do 125 mm.The inner threaded insert may be as it is normally used. So, for example, it can be made of steel, with an outside diameter of 50 to 150 mm and a length of 25 to 125 mm.

Ugotovili smo da so telesa mašilnih drogov, izdelana po predmetnem izumu presenetljivo in bistveno manj nagnjena k pokanju kot dosedanja telesa mašilnih drogov, kjer navojni del luknje sega do zgornjega konca mašilnega droga. Čeprav se ne želimo omejevati na nobeno določeno teorijo verjamemo, da so vsota nekaterih doseženih prednosti in razlogi za nekatere prednosti naslednji:We have found that the bodies of the sealing rods made according to the present invention are surprisingly and significantly less prone to bursting than the existing bodies of sealing rods, where the threaded portion of the hole extends to the upper end of the sealing rod. Although we do not want to limit ourselves to any particular theory, we believe that the sum of some of the benefits achieved and the reasons for some of the benefits are as follows:

1. Pokanje na koncu luknje med stiskanjem je bistveno zmanjšano ali odpravljeno, zaradi odsotnosti navoja v tem kritičnem področju.1. Cracking at the end of the hole during compression is significantly reduced or eliminated due to the absence of thread in this critical area.

2. Strojni del lahko prenaša višje torzijske obremenitve, ker je navojni del, med stiskanjem, pod enakomernim tlakom.2. The machine part can withstand higher torsional loads because the threaded part, under compression, is under uniform pressure.

3. Navojni del je bolje zaščiten pred oksidacijo med žganjem stisnjenega telesa.3. The threaded part is better protected against oxidation during firing of the compressed body.

4. Zagotovimo lahko boljšo plinotesnost.4. Better gas tightness can be guaranteed.

Poleg tega prednosti vključujejo dejstvo, da je sprememba oblike, v primerjavi z dosedanjo obliko, enostavna in zahteva minimalne posege v orodja. Lahko se tudi izognemo potrebi po uporabi keramičnih ali drugih vložkov, ki jih privijamo v navojni del luknje, torej lahko priključke droga za privijanje na mehanizem za dviganje in spuščanje privijemo neposredno na navojni del luknje.In addition, the advantages include the fact that the change of shape, compared to the previous shape, is simple and requires minimal intervention in the tools. It is also possible to avoid the need to use ceramic or other inserts that are screwed into the threaded portion of the hole, so that the threaded rod attachments on the lifting and lowering mechanism can be screwed directly onto the threaded portion of the hole.

Kratek opis slikShort description of the pictures

V nadaljevanju bodo opisane izvedbe predmetnega izuma s pomočjo primerov in s pozivanjem na priložene slike, ki prikazujejo:The following will be described embodiments of the present invention by way of examples and by reference to the accompanying drawings showing:

Slika 1: je shematski prikaz dela običajnega kalupa za izdelavo telesa mašilnega droga;Figure 1: is a schematic view of a portion of a conventional mold for producing a seal rod body;

Slika 2: prikazuje istovrsten pogled dela kalupa po predmetnem izumu;Figure 2: shows an identical view of a portion of a mold according to the present invention;

Slika 3: prikazuje vzdolžni prerez mašilnega droga po predmetnem izumu;Figure 3: shows a longitudinal cross-section of the sealing bar of the present invention;

Slika 4: prikazuje enak pogled kot slika 3, le da prikazuje mašilni drog z vstavljenim keramičnim obročem;Figure 4: shows the same view as Figure 3, except that it shows a seal rod with a ceramic ring inserted;

Slika 5: prikazuje vzdolžni prerez zgornjega dela mašilnega droga po predmetnem izumu.Figure 5: shows a longitudinal section of the upper part of the sealing bar according to the present invention.

Na sliki 1 je votlina (10) kalupa definirana med odstranljivim jedrom (12) in deformabilnim oklepom (14). Na enem koncu jedra (12) je pozicioniran vložek (16) z zunanjim navojem, ki je s svojim koncem, ki je od jedra (12) bolj oddaljeno, v stiku s ploščo (18). Vložek (16) ima del (16A) z zunanjim navojem, srednji del (16B) s stopničastim delom in zadnji del (16C). Plošča (18) definira konec votline (10) kalupa, ki odgovarja zgornjem delu telesa mašilnega droga, ki bo v votlini oblikovan. Razumljivo je, da bo navoj (20) na delu (16A) vložka (16) vlit v telo mašilnega droga, ko bo votlina (10) napolnjena s primernim sestavkom in stisnjen med oklep (14) jedro (12) in vložek (16). Omenjeni navoj bo nastal na steni luknje v telesu in bo segal vzdolž luknje od konca, ki ga definira plošča (18).In Figure 1, the mold cavity (10) is defined between the removable core (12) and the deformable armor (14). At one end of the core (12) is positioned an insert (16) with an external thread, which is in contact with the plate (18) with its end farther from the core (12). The insert (16) has an outer threaded part (16A), a central part (16B) with a stepped portion and a rear end (16C). The plate (18) defines the end of the mold cavity (10) corresponding to the upper body of the sealing rod to be formed in the cavity. It is understood that the thread (20) on the part (16A) of the insert (16) will be poured into the body of the sealing rod when the cavity (10) is filled with a suitable assembly and pressed between the armor (14) the core (12) and the insert (16) . Said thread will form on the wall of the hole in the body and extend along the hole from the end defined by the plate (18).

Uporaba stopničastega vložka (16) omogoča uporabo številnih jeder (12) z različno dolžino, v odvisnosti od celotne zahtevane dolžine droga.The use of a stepped insert (16) allows the use of a plurality of cores (12) of varying length, depending on the total required length of the pole.

Na sliki 2 so enakoznačni deli označeni z enakimi številkami, kot tisti na sliki 1.In Figure 2, the equal parts are indicated by the same numbers as those in Figure 1.

V tej izvedbi predmetnega izumu je votlina (10) kalupa ponovno definirana med jedrom (12) in deformabilnim oklepom (14.) Vložek z zunanjim navojem (16) zopet pritrdimo na en konec jedra (12) . Vendar je po predmetnem izumu, vložek (16) ločen od plošče (18), ki ravno tako določa konec votline kalupa (10), s pomočjo distančnika (22). Navojni del (16A) vložka (16) je pritrjen na distančnik (22) s pomočjo vijaka (22A).In this embodiment of the invention, the mold cavity (10) is redefined between the core (12) and the deformable armor (14). The outer threaded insert (16) is again attached to one end of the core (12). However, according to the present invention, the insert (16) is separated from the plate (18), which also determines the end of the mold cavity (10), by means of a spacer (22). The threaded part (16A) of the cartridge (16) is fixed to the spacer (22) by means of a screw (22A).

Razumljivo je torej, da bo stisnjeno telo, ki bo oblikovan v tem kalupu imelo navojni del luknje, ki pa bo oddaljen od zgornjega konca za razdaljo, ki je enaka dolžini (t) distančnika (22).It is therefore understandable that the compressed body formed in this mold will have a threaded portion of the hole, which will, however, be spaced from the upper end for a distance equal to the length (t) of the spacer (22).

Na sliki 3 je prikazan drog narejen na enak način kot drog na sliki 2. Mašilni drog (30) ima vzdolžno luknjo (31), ki se začenja kot ožja luknja (32) na spodnjem delu (33) droga, glede na položaj droga v uporabi. Kot je v navadi je v luknjo (31), blizu konca (33) vstavljen porozen zamašek (34) .Figure 3 shows the pole made in the same manner as the pole in Figure 2. The stirring rod (30) has a longitudinal hole (31) which starts as a narrow hole (32) at the lower part (33) of the rod, relative to the position of the pole in use. As usual, a porous stopper (34) is inserted into the hole (31), near the end (33).

Na zgornjem delu (35) droga ima luknja razširitev (36) brez navoja, kjer ima razširitev večji premer od luknje (31) , v skladu s premerom distančnika (22). Navojni del (37), ki odgovarja navojnemu delu (16A), leži med razširitvijo (36) in osnovno luknjo (31).On the upper part (35) of the rod, the hole has a non-threaded extension (36) where the extension has a larger diameter than the hole (31), in accordance with the diameter of the spacer (22). The threaded portion (37) corresponding to the threaded portion (16A) lies between the extension (36) and the base hole (31).

Na sliki 4 je prikazan podoben mašilni drog kot na sliki 3, kjer so posamezni deli označeni identično z izjemo razširitve (36), ki ima vstavljen keramični vložek (38), s čimer je olajšana pritrditev mehanizma za dviganje in spuščanj e.Figure 4 shows a similar sealing bar to Figure 3, where the individual parts are marked identically with the exception of an extension (36) having a ceramic insert (38), thus facilitating the attachment of the lifting and lowering mechanism e.

Ni nujno, da je vložek (38) prilepljen v razširitev (36), vendar se prednostno relativno tesno prilega.The insert (38) need not necessarily be glued to the extension (36), but preferably it fits relatively tightly.

Na sliki 5 ima mašilni drog (40) vzdolžno luknjo (41), ki ima razširitev (42) brez navoja na zgornjem delu in navojni del (43) neposredno pod razširitvijo (42).In Figure 5, the sealing rod (40) has a longitudinal hole (41) which has an extension (42) without a thread at the top and a threaded part (43) directly below the extension (42).

Navojni keramični vložek (44) je uvit v navojni del (43) luknje, keramični vložek (45) pa leži v razširitvi (42) v stiku z zgornjo površino vložka (44) z zunanjim navojem.The threaded ceramic insert (44) is threaded into the threaded portion (43) of the hole, and the ceramic insert (45) lies in expansion (42) in contact with the upper surface of the insert (44) with the outer thread.

Vložek z zunanjim navojem (44) zagotavlja tesen nased telesa pritrjevalnega droga (46) v mašilni drog, kjer spodnji konec (47) pritrjevalnega droga (46) leži v luknji (41). Drog (46) ima obroček (48), ki nalega na sedež (49) v luknji (41) neposredno pod navojnim delom (43) luknje. Drog (46) je vložev v luknjo pred vložkom z navojem (44), kjer se spodnji del slednjega nahaja na zgornji ploskvi obročka (48) in tako pritrjevalni drog (46) trdno pritrdi v luknjo (41) .The outer threaded insert (44) secures the fastening body of the fastening rod (46) in the sealing rod, where the lower end (47) of the fastening rod (46) lies in the hole (41). The rod (46) has a ring (48) which rests on the seat (49) in the hole (41) directly below the threaded portion (43) of the hole. The rod (46) is inserted into the hole before the threaded insert (44), where the lower part of the latter is located on the upper surface of the ring (48), thus firmly securing the fixing rod (46) to the hole (41).

Na drog (46) je nameščeno vlaknato tesnilo (50), ki je v stiku z zgornjo ploskvijo (40A) mašilnega droga (40), čeprav je na sliki 5, zaradi razločnosti prikazano na določeni razdalji od omenjene ploskve (40A).A fibrous seal (50) which is in contact with the upper surface (40A) of the sealing rod (40) is mounted on the pole (46), although shown in Fig. 5, for the sake of clarity, at a certain distance from said surface (40A).

Opisana izvedba zagotavlja dobro, zrakotesno sestavo na zgornjem delu mašilnega droga, kar je zelo zaželeno, ker se lahko med uporabo v luknji (41) pojavi vakuum.The described embodiment provides a good, airtight composition on the upper part of the sealing rod, which is highly desirable since a vacuum may occur during use in the hole (41).

zafor

FOSECO INTERNATIONAL LIMITEDFOSECO INTERNATIONAL LIMITED

Burmah Castro! HouseBurmah Castro! House

Claims

PATENT APPLICATIONS

1. A method of manufacturing a sealing rod, where a mold (10) is filled with a composition for producing a sealing rod, and a removable core (12) is inserted into the mold to form a longitudinal hole (31, 41) in the body of the sealing rod, a removable insert (16) with Fit the outer thread into the mold by forming an inner thread (37, 43) on the part of the hole with respect to the removable core (12) and insert the plate (18) into the mold by defining the flat upper end (35, 40A) of the body of the sealing rod, characterized in that the spacer (22) is positioned between the insert (16) with the outer thread and the plate (18), thereby forming the inner thread (37, 43) in the hole (31, 41) of the seal rod body at a certain distance from the upper end (35, 40A) bodies when the composition is pressed into a mold.

Method according to claim 1, characterized in that the sealing rod is formed by isostatic compression in a deformable mold.

Method according to claim 1 or 2, characterized in that the insert (16) with an external thread and a removable core (12) is to place the mold as one piece.

A mold for producing a body of rod having a removable core (12) corresponding to a desired hole (31, 41) in the body (30, 40), an outer armor (14) surrounding the removable core (12) and defining a cavity ( 10) in which a body will be formed, a removable insert (16) with an external thread, which is inserted into the mold so that, with respect to the removable core (12), an internal thread (37, 43) and a plate (18) are formed on the hole the mold by defining a straight upper end (35, 40A) of the body, characterized in that it contains a spacer (22) which is mounted between the insert (16) with an external thread and a plate (18), thereby making the inner thread (37, 43) in the hole (31, 41) of the body of the sealing rod is formed at a certain distance from the upper end (35, 40A) of the body.

Mold according to claim 4, characterized in that the threaded insert (16) is a full cylinder or cylindrical ring.

Mold according to claim 4 or 5, characterized in that the threaded insert (16) can be attached to the removable core (12) or can be formed as an extension of the removable core (12).

Mold according to claim 4 or 5, characterized in that the spacer (22) is made of metal or ceramic and is from 10 mm to 50 mm long.

Mold according to claim 4, 5 or 6, characterized in that the threaded insert (16) is made of metal and has an outer diameter of 50 mm to 150 mm and a length of 25 mm to 150 mm.

Mold according to any of claims 4 or 8, characterized in that the threaded insert (16) is screwed onto the spacer (22).

10. A stirring rod having a body (30, 40) with a longitudinal hole (31, 41), wherein the hole at the upper straight end (35, 40A) of the body is open and having a threaded portion (37, 43) separated from the upper end ( 35, 40A) of the hole, by means of a circular extension (36, 42), characterized in that when said sealing rod is attached to the lifting and lowering mechanism (46), the circular extension is filled with cement or contains a ceramic ring which it surrounds part of the lifting and lowering mechanism (46).

11. A cutting rod according to claim 10, characterized in that the diameter of the circular extension (42) is larger than the diameter of the work with the inner thread (43).