CN100513117C

CN100513117C - Making process of horizontal polyethylene storage tank with integral support

Info

Publication number: CN100513117C
Application number: CNB2007100207149A
Authority: CN
Inventors: 杭新华
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-03-20
Filing date: 2007-03-20
Publication date: 2009-07-15
Anticipated expiration: 2027-03-20
Also published as: CN101020350A

Abstract

The technological process of making horizontal polyethylene storage tank integral support includes the following steps: 1. preparing material through mixing linear low-density polyethylene and linear high-density polyethylene in the weight ratio of 100 to 10-20; 2. making tank steel lining; 3. preparing mold; 4. assembling mold and clamping mold; 5. rolling plastic to form the tank through rolling in roller rotation speed of 30-40 rpm, baking at tank wall temperature of 170-250 deg.c for 40-350 min and curing for the plastic to be attached to the surface of the steel lining; and 6. cooling and demolding. The storage tank thus produced has the advantages of once integral formation, no seam, high impact strength, ageing resistance, light weight, acid and alkali resistance, long service life, etc.

Description

The manufacturing process of horizontal polyethylene storage tank with integral support

Technical field

The present invention relates to the production method of the equipment of a kind of storage that is used for liquid and transportation, be meant a kind of manufacturing process of horizontal polyethylene storage tank with integral support particularly.

Background technology

In many industries such as chemical industry, medicine, biology, agricultural chemicals, use a large amount of organic and inorganic acid-base solution and organic solvent, the storage of these liquid and transportation are mainly finished by basin, and therefore, the service life of basin, performance such as corrosion-resistant are most important.Mostly existing basin is to adopt polyvinyl chloride (PVC) be raw material, and the polyvinyl chloride chemical property is not so good as polyethylene, and its impact strength, non-oxidizability, chemical resistance are poor.Therefore the welding storage tank impact resistance is poor, and easily photooxidation is aging becomes broken, anti-organic solvent poor performance.Service life is shorter, and the solution scope that is suitable for splendid attire is little.The molding process that revolves that manufacturing process adopts production board circle system utilizes manual plastic welding machine to be welded.The production board quality differs, and some contains additive, influences basin chemical resistance and service life.Adopt welding procedure that manhole, flange are welded on the prefabricated tank body, unavoidably have weld seam to exist, therefore, the basin overall structure is discontinuous, and the intensity overall performance is poor, and weld seam easily causes seepage; And weld seam has projection, influences the good looking appearance of basin.Basin also must be installed on cement or the iron support and could work in addition, and support is to make separately, and cement support is difficult mobile, and iron support is perishable.

Summary of the invention

The object of the present invention is to provide a kind of process of making horizontal polyethylene storage tank with integral support,, enhance product performance, prolong product service life, reduce manufacturing cost to overcome the defective of prior art.

According to technical scheme provided by the invention, the process of making horizontal polyethylene storage tank with integral support comprises:

(1) raw material is prepared: with LLDPE and linear high-density polyethylene is the ratio mixing of 100:10～20 according to parts by weight;

(2) making of steel lining tank body: can body, back cover and the end socket member of steel made the steel lining tank body of given size, and offer manhole and flange hole on request;

(3) mould is prepared: apply the methyl-silicone oil releasing agent at prefabricated mould inner wall;

(4) dress mould and matched moulds: the steel lining tank body is put into prefabricated mould, pack into after mixed raw materials weight is on request weighed in the mould,, be placed on the roller of rotational moulding main frame then with mould assembly unit matched moulds;

(5) rotation molding: adopt the rotational moulding method, 30～40 rev/mins of main frame roller rotating speeds, 170～250 ℃ of tank wall temperatures, 40～350 minutes firing times, raw material is solidified be attached to the steel lining tank surface, form the moulding tank body;

(6) cooling and demolding: stop heating, be rotated further roller, make the moulding tank body naturally cool to 40～60 ℃; Close the rotation knob again, roller is stopped operating, the dismounting mould is deviate from the moulding tank body from mould.

Described mould comprises the mould of can body, the mould of end socket, the mould of back cover, the mould of manhole, the mould of flange, the mould and the assembly unit auxiliary of rolling ring.

When rotation molding, at first end socket and the back cover to steel lining tank body two ends carries out hot briquetting, the rotation knob is waved in unlatching, and the end socket or the back cover of steel lining tank body end are swung up and down, and forces mixed raw materials to flow in the process of waving and arrives each position of end socket or back cover; At end socket or back cover is rocked to low level or be heated 30～40 rev/mins of main frame roller rotating speeds, 200～250 ℃ of end socket or back cover temperature during near low level; It is 3～4 times that the end socket of spherical or back cover are fired number of times, and it is 4～6 times that the back cover of plane is fired number of times.

After cooling and demolding, carry out back processing trimming again, have damaged part to fill up and polish, polish for projection to the junction of seam, manhole, flange inside and outside the moulding tank body and moulding tank surface.

Advantage of the present invention is: 1, adopt rotational molding technique production, the basin good integrity does not have any soldered, compares with the anticorrosion basin of tradition, has non-leakage, long service life, the bright and clean characteristics attractive in appearance of profile.2, because support and tank body are one,, have characteristics easy for installation so need not to put in addition a shelf attachment.3, adopt the high-quality low density linear polyethylene to make raw material, that basin has is in light weight, strong shock resistance, intensity is good, ageing resistance is strong characteristics.4, low density linear polyethylene itself has good antiseptic property, can anti-inorganic, organic acids and base solution, can anti-most organic solvents and other fine chemical products, in sizable scope, can replace material products such as stainless steel, nickel, titanium, be widely used in industries such as chemical industry, medicine, biology, agricultural chemicals.5, compare with the basin that traditional employing fiberglass, enamel, stainless steel, tetrafluoroethene etc. are made, the horizontal polyethylene storage tank with integral support price is more cheap, low cost of manufacture.

Description of drawings

Fig. 1 is technological process of production figure of the present invention.

The specific embodiment

As shown in the figure: the process of horizontal polyethylene storage tank with integral support comprises the steps:

1, raw material is prepared: needed raw material LLDPE (LLDPE) and high density polyethylene (HDPE) (HDPE) are carried out the laboratory examination quality according to production standard, qualified back is after the fineness of sieve with the control raw material, prevent that the raw material conglomeration from influencing the quality and the chemical defence material of rotational moulding, mix with parts by weight 100:10～20 then.

2, the making of steel lining tank body:

A, select the steel plate section bar of the specification that meets the requirements for use and process the steel lining of end socket 9, the members such as steel lining of back cover 10 outward,, roll the tank body of given size with veneer reeling machine by producing the design drawing requirement.

B, require tank body is integrated welding according to JB/T 4735-1997 " steel welding non-pressure vessel ".

C, by producing the design drawing requirement, metal auxiliaries such as welding steel mesh, manhole, flange, support, hanger.

D, the can seam of integrating is carried out sanding and polishing handle.

E, check the overall dimensions of tank body at last, manhole, flange size and position check whether weld seam is up to specification, and whether steel mesh is firm.

3, mould is prepared: call mould by producing the design drawing requirement, mould comprises the mould of can body 6, the mould of end socket 9, the mould of back cover 10, the mould of manhole 2, the mould of flange 1, the mould and the assembly unit auxiliary of rolling ring 4.By design drawing requirement assembly unit mould, reserve charging aperture and manhole, after assembly unit finishes, the position that the contrast drawing is checked die size, manhole 2, flange 1.If the assembly unit mould is filled up with asbestos line or lute big piece, prevent the leak-stopping material and mould joint close bubble occurs.Check fineness, roundness in the mould, require rounding, bright and clean, after the passed examination, coat the methyl-silicone oil releasing agent of ormal weight at inwall, silicone oil is clipped each position of mould inboard equably, and repeatedly embrocates, and makes silicone oil infiltrate the die surface pore.

4, dress mould and matched moulds: the steel lining tank body is put into the good mould of assembly unit, pack into after mixed raw materials PE (LLDPE and HDPE) weighed in mould or the tank body, concrete weight fibrous root is decided according to made basin specification, and then with mould assembly unit matched moulds, slinging is placed on the roller of rotational moulding main frame.

5, rotation molding:

A, inspection rotational moulding main frame, electrical equipment, machinery, whether the operation parts are normal.

B, unlatching roller make roller drive mould and steel lining tank body rotate with mixed raw materials to turn knob, check whether main frame sound and vibration be normal.

C, unlatching liquefied gas light a torch, and heat.

D, at first end socket and the back cover to the tank body two ends carries out hot briquetting, the rotation knob is waved in unlatching, adjusting main frame roller rotating speed to 30～40 rev/mins, pot body closing end (end) is descended arrive extreme lower position, end socket or back cover are heated near thermal source, the end socket of different size (end) arrives the required asynchronism(-nization) of extreme lower position, and utilizing infrared thermometer to record the temperature of end socket and back cover should be between 200～250 ℃.

After e, end heating finish, open and wave rotary knob, make the end socket (end) of the tank body other end arrive extreme lower position, repeat the operation of above-mentioned d step.

The operation of f, repetition c, two steps of d, circulation is waved the number of times of firing and is determined that according to the shape of end socket (end) is big or small general spherical end socket or back cover are fired 3～4 times, for vertical basin, the common bit plane of its back cover, the back cover on this plane generally must be fired 4～6 times.

G, fire can body 6 at last, unlatching is waved and is revolved button, make tank body arrive horizontal level, and open tank body manhole 2, according to the tank body size, charge weight, the decision firing time, observe the dwell time that decision is fired at last by manhole 2, as observe in the tank body no powder and tank skin color and become transparent being and fire terminal point, the general time is 60～300 minutes, and recording the tank body temperature with infrared thermometer in the sintering procedure should be between 170～190 ℃.

6, cooling and demolding:

After a, can body 6 bake, close liquefied gas, stop heating, continue to open the roller rotation, make tank body naturally cool to 40～60 ℃.

I, close the rotation knob, tank body is winched to demoulding place.

J, dismounting mould are deviate from the moulding tank body from mould, rebuild for the back manufacturing procedure.

K, steel lining tank body can directly be delivered to the back manufacturing procedure and rebuild processing.

7, back processing trimming: have damaged part to fill up with the PE welding rod and polish to junction such as seam, manhole 2, flange 1 inside and outside the tank body after the demoulding and tank surface, for since die gap is big and bucket in bridging and projection carries out grinding process with emery wheel, use the design drawing requirement by producing, open hole, the Floating Ball Liquid Level hole of flange 1, the flange of welding manhole 2, support 3, jar in plate washer strut, Floating Ball Liquid Level device, drain hole 7 and the blowing groove 5 that is arranged at tank body 6 bottoms etc.

8, finished product: reach company standard by drawing by quality testing department and carry out an acceptance inspection, acceptance(check) is finished product.

Among the figure 8 is the supporting surface of support 3.

Claims

1, a kind of manufacturing process of horizontal polyethylene storage tank with integral support comprises following processing step:

2, the manufacturing process of horizontal polyethylene storage tank with integral support as claimed in claim 1 is characterized in that: described mould comprises the mould of can body, the mould of end socket, the mould of back cover, the mould of manhole, the mould of flange, the mould and the assembly unit auxiliary of rolling ring.

3, the manufacturing process of horizontal polyethylene storage tank with integral support as claimed in claim 1, it is characterized in that: when rotation molding, at first end socket and the back cover to steel lining tank body two ends carries out hot briquetting, the rotation knob is waved in unlatching, the end socket or the back cover of steel lining tank body end are swung up and down, force mixed raw materials in the process of waving, to flow and arrive each position of end socket or back cover; At end socket or back cover is rocked to low level or be heated 30～40 rev/mins of main frame roller rotating speeds, 200～250 ℃ of end socket or back cover temperature during near low level; It is 3～4 times that the end socket of spherical or back cover are fired number of times, and it is 4～6 times that the back cover of plane is fired number of times.

4, the manufacturing process of horizontal polyethylene storage tank with integral support as claimed in claim 1, it is characterized in that: after cooling and demolding, carry out back processing trimming again, there is damaged part to fill up and polish to the junction of seam, manhole, flange inside and outside the moulding tank body and moulding tank surface, polishes for projection.