CN1418771A - Method for producing metal and plastic composite tube - Google Patents

Abstract

The production method of metal-plastics composite pipe mainly includes the following steps: removing rust from metal pipe, cleaning metal pipe, placing said metal pipe on the turning frame, turning said metal pipe while heating, quickly adding hot sol and plastic powder into the interior of metal pipe and removing the metal pipe from the turning frame and applying hot sol and plastic powder on the external surface of the metal pipe so as to obtain the invented metal-plastic composite pipe with reliable quality, good compactness and corrosion resistance. It can produce metal-plastics composite pipe with any bore size.

Description

A kind of production method of composite metal-plastic pipe

The present invention relates to a kind of production method of composite metal-plastic pipe.

We know, composite metal-plastic pipe such as steel-plastics composite pipe, PAP etc., has strong corrosion resistant, when being used for industrial oil transportation, transfusion, liquid-transport pipe-line can not produce seepage or leakage phenomenon because of corrosion, thereby reduce the pollution of environment and the generation of security incident, save investment and maintenance cost, guarantee the pure of transfusion.When carrying, can not produce rust water and the people is caused healthy harm especially for running water, health and safety, long service life has the advantages such as high strength, rigidity, withstand voltage heatproof of metal or alloy pipe simultaneously again concurrently.Along with people to the attention of health and the enforcement and the industrial development of city quality classification water supply, composite metal-plastic pipe will be widely used.

At present, the production method of composite metal-plastic pipe generally is that plastic layer is prefabricated into plastic rigid pipe, through surface treatment polishing, gluing and metal tube suit, extracts air between inner and outer pipes again, heats compound cooling and shaping again and forms.But this method shortcoming is: operation is many and complicated, equipment that needs and special equipment are many and require high, investment is big, production efficiency is very low, and the production cost height is bonding between plastic rigid pipe and the metal tube, it cements airtight quality and is subject to produce each link influence, difficult control product quality easily causes between plastic rigid pipe and the metal tube and separates, so corrosion-resistant and poor durability.In addition, all can only produce some small-bore multiple tubes at present both at home and abroad, be that 1 meter, 2 meters or bigger multiple tube then can't suitability for industrialized production for some heavy calibers or super large caliber such as bore.

The purpose of this invention is to provide a kind of production method of producing various caliber size and high-quality, that technology can be enhanced productivity greatly and significantly reduce production costs simply again composite metal-plastic pipe.

Purpose of the present invention can be achieved as follows: the production method of this composite metal-plastic pipe comprises following processing step:

A. rust cleaning.Eliminate rust in inside and outside surface to prefabricated metal tube.

B. clean.After the rust cleaning, the inside and outside surface of metal tube is cleaned up.

C. metal tube flatly is placed on the runing rest, and makes metal tube from turning over.

D. heating.In the process of metal tube rotation, the whole body of metal tube is heated to high temperature, temperature is 150 ℃-300 ℃.

E. in the metal tube pipe, add PUR.In the process of metal tube rotation, add all amount or the substantially all PUR of amount on the length direction in the metal tube pipe, and allow metal tube continue rotation 20-40 commentaries on classics.

F. in the metal tube pipe, add molding powder.After adding PUR, then same in the process of metal tube rotation, add all amount or the substantially all molding powder of amount on the length direction in the metal tube pipe, and allow metal tube continuation rotation 20-40 change.

G. unload metal tube from runing rest, and evenly add PUR to the outer surface of metal tube immediately.

H. after the outer surface of metal tube adds PUR, add molding powder to its outer surface more immediately.

After the cooling, obtain composite metal-plastic pipe.

Adopt above-mentioned processing step to produce, utilize metal tube in its pipe, adding PUR under high temperature and the rotation status, along with the metal tube circular motion, the inner surface of the metal tube of high temperature will be stained with one deck PUR, and after rotation 20-40 changes, PUR will be bonded on the inner surface of metal tube equably, in like manner, when adding molding powder again, molding powder also will be bonded on the inner surface of metal tube equably by the cementation of PUR.Become to be the latex fluid shape because metal tube high temperature, molding powder soften substantially, after rotation 20-40 changeed, molding powder just was bonded on the inner surface of metal tube more equably, and the thickness basically identical, increased the amount of molding powder, and plastic layer is correspondingly thickening just.After the inner surface treatment of metal tube is intact, the outer surface of metal tube is simpler relatively, after unloading from runing rest, can when keeping high temperature, metal tube sprinkle PUR at its outer surface equably earlier, be pressed in then in the molding powder heap and toss about in bed a few, molding powder also just is being bonded on the outer surface of metal tube under the cementation of PUR equably, and softens and become to be the latex fluid shape, and the thickness of same plastic layer is also by the amount decision of molding powder.After metal tube cools down fully, the multiple tube that the plastics of metal tube and ectonexine will be combined into one securely, compactness is good, and separating can not appear in the plastics of metal tube and ectonexine, so quality is very reliable, corrosion-resistant and endurance quality utmost point Cui.Simultaneously, whole technical process is very simple, specification requirement to workman and equipment is not high, easy to operate, the workman reads through promptly can, produce a multiple tube and on average take 10 minutes, production efficiency is very high, and produce required capital equipment and be respectively and prop metal tube and can make the runing rest and the motor of its rotation, the heating cooking stove of heating usefulness, the opening charging spout that interpolation PUR and molding powder are used etc., these equipment are all very simple, small investment, thus can reduce production costs greatly, if utilize automated control technology again, these equipment are easy to realize automatic assembly line production, will enhance productivity better.The characteristics and the advantage of this method maximum are: can produce big small-bore multiple tube arbitrarily, be not subjected to the restriction of process conditions and equipment, as long as can make metal tube from turning over the multiple tube that just can easily obtain large and small bore as stated above, solved and can't produce heavy caliber at present both at home and abroad as 2 meters, 3 meters, even bigger steel-plastics composite pipe, PAP etc.Under situation about all progressively promoting both at home and abroad at present with metal composite pipe instead of pure metal tube, this method has fundamentally solved a technology difficult problem of producing big small-bore particularly bigbore metal composite pipe, therefore, will have huge market application potential.

The present invention is described in further detail below in conjunction with embodiment:

Be that the production that the steel of 40CM is moulded pipe is example with the bore.

At first, prefabricated steel pipe is carried out the rust cleaning on inside and outside surface, clean up inside and outside it with clear water then.

Then, the both ends horizontal of steel pipe ground is placed in respectively on the dop of runing rest, dop is similar to the chuck on the lathe, and dop can rotate under driven by motor, thereby can drive the steel pipe rotation.The simplest runing rest can be all to use every end of steel pipe two rotating shafts to prop up picking-up, and two rotating shafts will drive the steel pipe rotation when rotating, and the distance between axles of certain two rotating shafts should guarantee can not fall down when steel pipe rotates.

Then, allow motor that steel pipe is turned over certainly at runing rest, the rotating speed size is decided by the caliber size of steel pipe, is generally 20-40r/min.The steel pipe below is prosperous stove such as the coal furnace of burning that is provided with along the steel pipe length direction, steel pipe is heated to high temperature, steel pipe is heated while rotating, purpose is to make steel pipe energy thermally equivalent, it is consistent that temperature everywhere can reach substantially, and helping PUR and molding powder can balance be bonded on the surface of steel pipe equably.Steel pipe generally is heated to 150 ℃-300 ℃, because this temperature range just can make PUR and molding powder soften into the latex fluid shape, therefore the temperature of heating depends on the hot melt of PUR and molding powder.

Follow again,, in the time of preferably about 250 ℃, just can in the steel pipe pipe, add PUR by charging spout when steel pipe is heated to 150 ℃-300 ℃.Its length direction of charging spout upper edge has breach one, is used for charging or discharging, and what the length of breach should be than steel pipe on it during only with a charging spout is bigger, during with two then the length sum grow up than steel pipe, can feed in raw material simultaneously from the steel pipe two ends.When adding PUR, earlier charging spout is filled or made the amount of PUR on the charging spout unit length equal substantially, then charging spout is sent in the steel pipe pipe together with PUR, and rapidly charging spout is reversed with PUR, make its breach downward, PUR is just poured in the pipe entirely like this.Because steel pipe is that rotation, along with the circular motion and the PUR of steel pipe is subjected to the deadweight effect, add steel pipe temperature height, PUR will stick on the steel pipe circumferential inner surface, after steel pipe continued rotation 20-40 commentaries on classics, PUR will be emulsion state and be bonded in the pipe equably.

After adding PUR, can in steel pipe, add molding powder with that again, the same when adding PUR, also molding powder is sent in the pipe with charging spout.Along with the circular motion of steel pipe, as a same reason, molding powder is by the cementation of PUR, and molding powder also will stick on the steel pipe circumferential inner surface, and after steel pipe continued rotation 20-40 and changes, molding powder will be on the inner surface that emulsion state is bonded at steel pipe equably.In order to obtain better effect, then, also can seal steel pipe one end, in pipe, add the air of certain pressure then from the other end, continue rotation for a moment, the plastic layer of Xing Chenging can be more firm like this.

After handling the inner surface of steel pipe, take advantage of steel pipe high temperature, and then can handle outer surface of steel tube.Earlier the steel pipe that is in high temperature is unloaded on the ground from runing rest, then PUR is sprinkling upon equably the outer surface of steel pipe, the very fast adhesion coating that on outer surface of steel tube, forms an emulsion state of PUR.

After outer surface of steel tube added PUR, the steel pipe that and then will still be in high temperature was immediately put in the molding powder heap, tossed about in bed to and fro, and like this, molding powder is by the cementation of PUR, and molding powder will be on the outer surface that emulsion state is bonded at steel pipe equably.

After finishing above steps, wait steel pipe to cool down fully, the effect that molding powder will be by PUR clinkering securely is integral at the steel pipe surfaces externally and internally, thereby can obtain high-quality steel-plastics composite pipe.

Adopt above-mentioned principle steps, can finish the production of composite metal-plastic pipes such as PAP, Copper-plastic Composite Pipe, zinc-iron plastic composite equally, and the production of the composite metal-plastic pipe of various any caliber size.

What need supplementary notes is, can finish before metal tube is placed in the runing rest step the heating steps of metal tube, can be heated to high temperature and temperature basically identical everywhere as long as guarantee metal tube, and electricity consumption, fire etc. is heated and all can.Why heating while changeing, mainly is the compactness for production procedure.

Claims (1)

1, a kind of production method of composite metal-plastic pipe is characterized in that: this production method comprises following processing step:

A. rust cleaning.Eliminate rust in inside and outside surface to prefabricated metal tube.

B. clean.After the rust cleaning, the inside and outside surface of metal tube is cleaned up.

C. metal tube flatly is placed on the runing rest, and makes metal tube from turning over.

D. heating.In the process of metal tube rotation, the whole body of metal tube is heated to high temperature, temperature is 150 ℃-300 ℃.

E. in the metal tube pipe, add PUR.In the process of metal tube rotation, add all amount or the substantially all PUR of amount on the length direction in the metal tube pipe, and allow metal tube continue rotation 20-40 commentaries on classics.

F. in the metal tube pipe, add molding powder.After adding PUR, then same in the process of metal tube rotation, add all amount or the substantially all molding powder of amount on the length direction in the metal tube pipe, and allow metal tube continuation rotation 20-40 change.

G. unload metal tube from runing rest, and evenly add PUR to the outer surface of metal tube immediately.

H. after the outer surface of metal tube adds PUR, add molding powder to its outer surface more immediately.

After the cooling, obtain composite metal-plastic pipe.