CN101289311A - Wet method production process of white glaze integral molding porcelain bushing for 220KV hexafluoride sulphur circuit breaker - Google Patents

Abstract

The invention relates to a wet manufacture technique of a white glaze overall shaping porcelain sleeve used in a 220KVSF6 breaker, comprising the following steps in sequent: an electrical porcelain pug is well selected and fossilized for more than 120 hours; a roughcast is extruded in vacuum on an automatic water cooling stainless-steel pug mill; the roughcast is trimmed and shaped after being electrically dried in the shade for more than 144 hours, and the trimming part is sent into a little air heated air circulation-typed drying room for drying to obtain a dry blank; after the dry blank which is hanged horizontally is dipped into the glaze obliquely, the glaze is injected into an inner hole, and the glaze slip is white; after the surface of the glazed blank is decorated and arranged, sand feeding is carried out, and then the glazed blank is placed in a kiln and is sintered in high temperature, then after being drew out, qualified porcelain pieces are cut and ground and maintained with flange cementing, then after being certificated, the products can leave factory. The technique has the advantages that the products have the even internal texture and the stable structure; the qualified rate of the dry blank is above 86 percent; the reliability of the glazing technique of the glaze filling in a horizontal hanging and oblique dipping way is high.

Description

The 220 KV hexafluoride sulphur circuit breakers wet process technique of white glaze integral molding porcelain bushing

Technical field

The present invention relates to 220KVSF ₆The isolating switch wet process technique of white glaze integral molding porcelain bushing.

Background technology

220KVSF ₆The production of porcelain shell for circuit breaker always is key and the difficult points of all High-Voltage Electrical Appliances in the insulator.Its working environment is badly indefinite, and the inner operating pressure that also will bear 0.5～0.65MPa for a long time also will bear circuit in service and cut-off high temperature, high pressure and the high mechanical load that the arc burning that produced brings, and adds the SF of 220KV and above voltage range ₆The circuit breaker element insulator up to 2.3～2.5 meters between, total height of its whole assembling reaches about 5 meters, this has all brought higher requirement to its safe operation, this shows, and is extremely urgent to the improvement of original insulator wet process technique.

Summary of the invention

The wet process technique that the purpose of this invention is to provide the white glaze integral molding porcelain bushing of a kind of height below 2.5 meters, this insulator axis verticality tolerance is smaller or equal to 8mm, the white glaze of surfaces externally and internally requires color and luster pure continuously, and the glaze surface does not have ripple, glaze stream, concavo-convex, defectives such as glaze drips, spot, variable color.

220KVSF ₆The isolating switch wet process technique of white glaze integral molding porcelain bushing, this production technique in turn includes the following steps:

(1) selected water ratio is at the electroceramics pug between 19～20.5% and make it to experience old phase more than 120 hours;

(2) with water-cooled automatically The all steel pug mill carries out vacuum to above-mentioned electroceramics pug and extrudes operation, vacuum tightness 〉=0.097MPa when vacuum extrudes, gained blank length 3500mm, diameter 650mm;

(3) the gained blank is carried out electricity and dry in the shade, dry in the shade time 〉=144 hour of electricity, initial current density is 0.35mA/cm ², the termination current density is 2.0mA/cm ², the water content of the back blank that dries in the shade is 16.5～17%;

(4) use the full-automatic inside and outside profiling numerical control trimming machine of 4.2 meters of operating altitudes that the blank that electricity dries in the shade is carried out the repaired biscuit moulding;

(5) repaired biscuit spare is sent into the dry dry body spare that obtains in few air heated air circulation type drying room, 100 ℃ of drying room top temperatures, omnidistance 216 hours time of drying;

(6) dry body that takes out is smeared water and plaster and handle and make it horizontal, use with special hanger

Plastic jacket penetrate dry body spare endoporus and the hanging head and sit the platform position and rout up to prick and sternly pack tightly of two ends with adhesive tape, again coated outside one deck sponge

Iron pipe penetrate in the plastic jacket of dry body spare endoporus, suspension ring are arranged at the iron pipe two ends, again with crane and the special rope iron pipe two ends of slinging, the dry body head is being descended at last tail, dry body spare axis and ground angle are 30～40 °, subsequently the dry body spare of slinging is immersed in the glaze case that fills with the white glaze slurry and soak glaze, and the batching composition of described white glaze slurry is-SiO ₂: 65-70 weight %, Al ₂O ₃: 8-12 weight %, K ₂O+Na ₂O:4.5-7 weight %, Fe ₂O ₃＜0.7%, TiO ₂＜0.3%, MgO+CaO:5.5-7.5 weight % burns decrement＜5.2 weight %;

(7) soak behind the glaze blank hung out and place on the frock, extract iron pipe out, untie plastic jacket and will it by after the blank endoporus extraction, sling failed part upright and place endoporus to annotate on glazer's assembling platform, open white glaze slurry pipeline valve and makes the white glaze slurry inject from blank endoporus lower end, the white glaze slurry of again endoporus being filled with to the specified altitude is emitted;

(8) glaze blank surface is done to go up the sand technological operation after the modification arrangement, upright immediately loading of kiln, high-temperature roasting are carried out cutting and grinding, the maintenance of flange mucilage binding to the porcelain spare that is up to the standards behind the kiln discharge, through dispatching from the factory after the assay was approved.

Beneficial effect of the present invention is: raw materials used when one, vacuum extrude the electroceramics pug, equipment and vacuum tightness have guaranteed the reasonableness that aligns between homogeneity of structure, structural stability and the pug particle of blank mud intersegmental part of product; They are two years old, because adopt the dry drying room equipment of novel few air heated air circulation type, and carry out technology controlling and process, thereby guaranteed the dry mass of repaired biscuit spare according to the drying principles of low temperature and high relative humidity, the qualification rate that makes dry body spare is higher than at least ten five percentage points of like products more than 86%; They are three years old, glaze method on " horizontal hanging tiltedly soaked the filling glaze " of adopting in this technology, both greatly reduce dry body spare and be stained with the phenomenon that glaze when suction intensity reduces to fracture, unlikely again pollution white glaze slurry, the color and luster change can not appear yet, produce the glaze sagging and drip and wait worn-out disease, thereby significantly improved the reliability of this operation.

Embodiment

Selected water ratio is electroceramics pug and the old phase of order experience more than 120 hours of 19-20.5%; With water Cold type

The stainless steel pug mill carries out vacuum and extrudes operation, sets vacuum tightness＞0.097MPa, obtains

Blank, gained blank carry out electricity and dried in the shade 144 hours, and its start-stop current density is 0.35mA/cm ²And 2.0mA/cm ², the water content of blank was 16.5%-17% after electricity dried in the shade; Use the full-automatic inside and outside profiling numerical control trimming machine of 4.2 meters of operating altitudes that above-mentioned blank is carried out the repaired biscuit moulding, again repaired biscuit spare is sent into the dry dry body spare that obtains in few air heated air circulation type drying room, 100 ℃ of drying room top temperatures, omnidistance 216 hours time of drying; The dry body spare that takes out is smeared water plaster and handle and make it horizontal, use with special hanger

Plastic jacket penetrate dry body spare endoporus and the hanging head and sit the platform position and rout up to prick and sternly pack tightly of two ends with adhesive tape, again coated outside one deck sponge

Iron pipe penetrate in the plastic jacket of dry body spare endoporus, suspension ring are arranged at the iron pipe two ends, again with crane and the special rope iron pipe two ends of slinging, the dry body head is being descended at last tail, dry body spare axis and ground angle are about 35 °, subsequently the dry body spare of slinging is immersed to fill with in the glaze case of starching according to the white glaze of side's preparation and soak glaze (horizontal the hanging tiltedly of this meaning soaked), soak behind the glaze blank hung out to place and extract iron pipe on the frock out, untie plastic jacket and with it by extracting out in the blank endoporus, the blank of slinging makes it upright and places endoporus to annotate on glazer's assembling platform, and the pipeline valve of opening the white glaze slurry of complying with side's preparation carries out the grouting operation of blank endoporus; Sand is gone up in glaze blank finishing arrangement back, and upright immediately loading of kiln, high-temperature roasting are carried out cutting and grinding, the maintenance of flange mucilage binding to qualified porcelain spare behind the kiln discharge, through dispatching from the factory after the assay was approved.

Claims (1)

1.220 the KV hexafluoride sulphur circuit breaker wet process technique of white glaze integral molding porcelain bushing, this production technique in turn includes the following steps:

(1) selected water ratio is at the electroceramics pug between 19～20.5% and make it to experience old phase more than 120 hours;

(2) with water-cooled automatically

The all steel pug mill carries out vacuum to above-mentioned electroceramics pug and extrudes operation, vacuum tightness 〉=0.097MPa when vacuum extrudes, gained blank length 3500mm, diameter 650mm;

(3) the gained blank is carried out electricity and dry in the shade, dry in the shade time 〉=144 hour of electricity, initial current density is 0.35mA/cm ², the termination current density is 2.0mA/cm ², the water content of blank was 16.5～17% after electricity dried in the shade;

(4) use the full-automatic inside and outside profiling numerical control trimming machine of 4.2 meters of operating altitudes that the blank that electricity dries in the shade is carried out the repaired biscuit moulding;

(5) repaired biscuit spare is sent into the dry dry body spare that obtains in few air heated air circulation type drying room, 100 ℃ of drying room top temperatures, omnidistance 216 hours time of drying;

(6) dry body that takes out is smeared water and plaster and handle and make it horizontal, use with special hanger

Plastic jacket penetrate dry body spare endoporus and the hanging head and sit the platform position and rout up to prick and sternly pack tightly of two ends with adhesive tape, again coated outside one deck sponge

Iron pipe penetrate in the plastic jacket of dry body spare endoporus, suspension ring are arranged at the iron pipe two ends, again with crane and the special rope iron pipe two ends of slinging, the dry body head is being descended at last tail, dry body spare axis and ground angle are 30～40 °, subsequently the dry body spare of slinging is immersed in the glaze case that fills with the white glaze slurry and soak glaze, and the batching composition of described white glaze slurry is-SiO ₂: 65-70 weight %, Al ₂O ₃: 8-12 weight %, K ₂O+Na ₂O:4.5-7 weight %, Fe ₂O ₃＜weight 0.7%, TiO ₂＜0.3%, MgO+CaO:5.5-7.5 weight % burns decrement＜5.2 weight %;

(7) soak behind the glaze blank hung out and place on the frock, extract iron pipe out, untie plastic jacket and will it by after the blank endoporus extraction, sling failed part upright and place endoporus to annotate on glazer's assembling platform, open white glaze slurry pipeline valve and makes the white glaze slurry inject from blank endoporus lower end, the white glaze slurry of again endoporus being filled with to the specified altitude is emitted;

(8) glaze blank surface is done to go up the sand technological operation after the modification arrangement, upright immediately loading of kiln, high-temperature roasting are carried out cutting and grinding, the maintenance of flange mucilage binding to the porcelain spare that is up to the standards behind the kiln discharge, through dispatching from the factory after the assay was approved.