CN100516388C - Well wall pipe with special concavo-convex thread and producing method thereof - Google Patents
Well wall pipe with special concavo-convex thread and producing method thereof Download PDFInfo
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- CN100516388C CN100516388C CNB2007100231631A CN200710023163A CN100516388C CN 100516388 C CN100516388 C CN 100516388C CN B2007100231631 A CNB2007100231631 A CN B2007100231631A CN 200710023163 A CN200710023163 A CN 200710023163A CN 100516388 C CN100516388 C CN 100516388C
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Abstract
The process of producing plastic casing pipe with both male and female thread includes the following steps: cutting the pipe blank into required length, hot pressing in mold, pressing male thread in a combined mold without injecting hole and exhaust hole, and pressing female mold.
Description
Technical field
The present invention relates to a kind of wall casing.Especially have wall casing of specific negative and positive screw thread and preparation method thereof, mainly relate to the water wall casing of the plastics preparation of shallow well and deep-well use.
Background technology
China is a lack of water country, Beijing and North China, northeast, each province, northwest provincial capital in more than 300 interior city with exploiting groundwater as the urban water supply water source; China is large agricultural country, and national agricultural water accounts for more than 80%.Particularly in the northern area farmland irrigation water, exploitation utilizes underground water to account for sizable ratio at agricultural water.Well is as the important water intake engineering of development and use groundwater resources, and the water wall casing is again the main member that well is made in well-digging.Playing huge effect aspect China's development and utilization groundwater resources, developing agricultural irrigation and the people and animals' water.Tradition is used to create the tubing of well based on cast iron pipe, steel pipe, pipe of cement, because there is serious etching problem in these tubing, not only impact the application life to well, many adverse consequences have also been produced simultaneously, gush sand, surface settlement, water pollution, ground subsidence etc. as well, therefore cause very surprising loss every year.
CN200420008810.3 relates to the glass fiber reinforced plastic wall casing; with the resin is matrix; glass fiber is a reinforcing material; quartz sand is as a kind of pipeline of the pipe-line system that can be used for the drinking water well of filler, and structural pipe wall is respectively from inside to outside: inner liner, inner winding layer, stiffness layer, outside winding layer, outer protection layer.Pipeline connects with the socket glue joint formula.
CN03213096.1 annular double-walled wall casing is that the tube wall of wall casing is provided with treatment hole, also is provided with the bushing pipe of band treatment hole in the wall casing; Inner chamber between wall casing and bushing pipe double-walled is connected with reinforcing rib, and connecting hole is longitudinally arranged in the reinforcing rib; There is annular slot the upper end of wall casing, and there is the annular plug that cooperates with upper end annular slot the lower end of wall casing, and the double-wall pipe of reinforcing rib looping hollow is arranged in the middle of the wall casing.
CN200510012918.9 nodular cast iron machine well pipe and production method thereof, pipe is made of nodular cast iron machine well filter pipe and nodular cast iron machine well wall pipe, be characterized in that the nodular cast iron machine well filter pipe is a round tube, there is external screw thread at every section two ends, two stirrups are arranged on the circumference, be covered with several small through hole on the section outer wall between two stirrups, and around full wrapping wire; Nodular cast iron machine well wall pipe is a tubular, and there is external screw thread at its two ends.The corrosion-resistant of pig machine well casing arranged, and the life-span is long, possesses the tensile strength height of steel pipe again, and the advantage of good toughness integrates cast iron pipe, steel pipe function.
CN97218459.7 uses the plastic pipe jointing more, a kind of jointing that is used for plastic thin wall flexible pipe and plastics medium-soft pipe, be made up of socket and spigot joint 1, socket 2, sealing ring 3, the structure of this joint is used for screw thread joint for plastic tube, elbow, threeway, straight joint, the first-class various unions of loose joint.
Prior art was also introduced the arch form cavity wall casing of well wall.The cavity pipe that adopts modified polyethylene material to make, wall cross-section is hollow arch form, both sides connect the boss slot and are symmetrical arranged, and according to the requirement of well internal diameter, many arch form cavity wall casings are combined, and promptly can be assembled into the water supply well borehole wall.
Yet prior art also is not suitable for the deep-well pipe, the well that reaches deeply about 300 meters has been the object that we must face, still do not have good wall casing at present and can satisfy this requirement, the wall casing of above-mentioned proposition can not satisfy the requirement on the physical strength, this water wall casing is wanted and can be seated to pit shaft by joint, and also wanting can be by the one-tenth well rate that saves the quality that lifts the engineering that is used to guarantee to dig a well.CN200420111601.1 moulded plastic pipe mold, its structure is: comprise die (3) and punch (8), die is provided with injecting hole (14) and the steam vent (9) that is communicated with its inner chamber (4).Punch (8) is provided with the flange (1) that connects die; Flange (1) is close to the entrance point edge of die, and they are linked to each other by several bolts (13); On the side face (10) of die, be provided with some equally distributed ring-type convex tendons (11); Right-hand member end face (6) at the inner chamber (4) of die is located, and is provided with the ring-type seam, and it closely links to each other with the shoulder (7) of punch (8).Can process the various discharging town rains that comprise structure-wall pipe material, reducing short tube etc. and the plastic pipe of sewage, shaping workpiece is plentiful, and the plastic product quality is good.
The existing wall casing that is threaded has the employing machining mode to carry out, but its bonding strength is low, and pipe length is restricted, and generally can only make the length of 3-4 rice, can't be applied to the deep-well wall casing; Become well construction to waste time and energy.
Summary of the invention
The object of the invention provides the water wall casing with negative and positive screwed connection form of the plastics preparation that a kind of shallow well and deep-well use, and overcomes described well and gushes problems such as sand, well casing fouling, water pollution, well casing rot; In particular for reaching 300 meters or darker deep-well pipe deeply; Still the plastics wall casing that does not have at present good connected mode can satisfy this requirement, the wall casing of above-mentioned proposition can not satisfy the requirement on the physical strength, this water wall casing is wanted and can be seated to pit shaft by joint, and also wanting can be by the one-tenth well rate that saves the quality that lifts the engineering that is used to guarantee to dig a well.
Plastics wall casing with negative and positive screw thread, an end of pipeline are that the urceolus at tube wall is provided with pin thread, and the other end of wall casing is provided with the sleeve of expansion, and the internal diameter of the sleeve of expansion is provided with and states the negative thread that pin thread cooperates.
The cross sectional shape of pin thread and negative thread all is waveforms, and the length areas of negative and positive screw thread is at 2-15 centimetre or longer, and the tooth depth of screw thread is at least more than 1mm.Generally be 1-5mm.
Plastics borehole wall pipe have negative and positive screwed connection position the preparation method: the wall casing main body adopts the method for extrusion molding, extruded pipe is blocked back extrusion molding pipe on demand adopt hot-formingly in mould, adopt up and down or comprise that complete outer mold and inner mold are hot-forming at pin end; The compacting of pin end is by inner mold and the screw thread die set of joint close is hot-forming up and down; The compacting screw thread die set of pin end does not all have injecting hole and steam vent; And the compacting of female threaded pipe end adopts outer pipe mold and internal thread extrusion die to carry out hot extrusion molding; Outer pipe mold entangles the extruded pipe end, with the moulding of internal thread extrusion die hot extrusion extruded pipe inwall.
The female threaded pipe end of wall casing is located at the processing of the sleeve of expansion and adopts mould extrusion modling mode, wherein mould comprises complete outer mold and inner mold, wherein outer mold adopts the outer cavity structure of expansion back sleeve, the inner mold end is provided with screw thread, the heating back adopts the rotation fashion of extrusion to clamp-on simultaneously in the pipe, and the temperature of moulding is 110-130 degree centigrade for U-PVC; Mode of heating can adopt the high frequency coil induction mode.And the compacting of female threaded pipe end adopts outer pipe mold and internal thread extrusion die to carry out hot extrusion molding.Outer pipe mold entangles the extruded pipe end, with the moulding of internal thread extrusion die hot extrusion extruded pipe inwall, can screw out during the demoulding.Tube hub can be lined with the steel pipe core (inner mold) of coating release agent simultaneously.
The inventive method moulded plastic pipe mold, the compacting of pin end by inner mold and up and down the screw thread die set of joint close all do not have injecting hole and steam vent.The screw thread die set of joint close two moulds that the cross section all is semicircles especially up and down up and down; Adopt the mistakes tight fit of mold cavity, in material accumulation when the equally distributed convex tendon of n bar is used to hold extruding on the mould.Described outer pipe mold upper orifice end is provided with the ring-type seam.
The present invention adopts the PVC of modification, prepares the pipe of plastics wall casing as the PVC pellet of strengthening through fiber or nylon alloy strengthens.
Characteristics such as that plastics borehole wall pipe has is in light weight, resistance to corrosion strong, good endurance, cost are low particularly in the well industry of external developed regions, all adopt the plastics well casing abroad more than 80%.
Of the present invention have a PVC-U borehole wall dedicated pipe that negative and positive screwed connection form plastics wall casing especially adopts modification, and its advantage is:
1. in light weight, transportation and easy for installation.New generation of environment protection PVC-U plastics wall casing proportion is 1.35-1.45, only is about 1/6 of steel pipe and cast iron pipe.In becoming the well process, the well casing that is lowered in the wellhole is conducted oneself with dignity approximately greater than mud buoyancy, and lifting power that need not be very big can be managed down smoothly, and safe and reliable, following pipe labour intensity is little.
2. resistance to corrosion is strong, good endurance.New generation of environment protection modified PVC-U plastics wall casing does not almost react with chemical substances such as acid, alkali, salt, and application life can be more than 50 years.
3. water quality degree height definitely.New generation of environment protection modified PVC-U plastics wall casing adopts the PVC-U plastic pipe health, the five poisonous creatures: scorpion, viper, centipede, house lizard, toad, non-scaling, non-breed bacteria of health level, polluted water not.
4. reduce and use energy consumption.The roughness of new generation of environment protection modified PVC-U plastics wall casing only is 0.008, and the energy consumption in the inner wall smooth use is less.
5. resistanee to rupture height, shock resistance are good.New generation of environment protection modified PVC-U plastics borehole wall pipe ring stiffness＞32000N/m
2
6. wear-resistant.New generation of environment protection modified PVC-U plastics borehole wall pipe has remarkable abrasion resistance properties can reach the wearing and tearing that big reduction is crossed water space owing to water inlet to filter pipe, and particularly on the higher stratum of water inlet flow velocity, abrasion resistance properties is particularly important.
7. well casing connected mode installation rate is fast, and is safe and reliable.It is high but also can save down the pipe time greatly that well casing adopts specific screw thread or shear pin to connect not only tensile strength.
8. well casing low price shaft building cost is low.The price of comparing new generation of environment protection modified PVC-U plastics wall casing with the steel well casing of same specification is than steel tube low 1/3.Production tube is in light weight in addition, and cost of transportation can reduce significantly, and well casing is installed, convenient in carrying becomes the human and material resources in the well process to save in a large number.
The specific embodiment
The interior processing of the sleeve negative thread that the other end of wall casing is located at expansion adopts same process: make the outer tube of expansion simultaneously and suppress negative thread, it is the outer tube shape (adopting the outer cavity structure and the demolding structure of the sleeve after expanding) of expansion that this end adopts outer pipe mold; Outer pipe mold heats simultaneously, and the internal thread extrusion die of cylindricality adopts hot extrusion molding.Because outer pipe mold entangles the extruded pipe end, with the moulding of internal thread extrusion die hot extrusion extruded pipe inwall.
Interior extrusion die, the inner mold end is provided with screw thread, the heating back adopts the rotation fashion of extrusion to clamp-on in the pipe simultaneously, mode of heating can adopt the high frequency coil mode, according to the inner mold structure, the length that the column structure end is provided with pin thread equals to be provided with the length of negative thread inwall, is provided with sealing dome perpendicular to the column face apart from pin thread length place, end at inner mold; And the end is provided with pin thread identical with the modulus that the urceolus of tube wall is provided with pin thread (will consider certainly that expanding with heat and contract with cold of plastics bring the error of workpiece).
Claims (7)
1, the preparation method who has the plastics wall casing of negative and positive screw thread: it is characterized in that the wall casing main body adopts the method for extrusion molding, extruded pipe is blocked back extrusion molding pipe on demand adopt hot-formingly in mould, adopt up and down or comprise that complete outer mold and inner mold are hot-forming at pin end; The compacting of pin end is by inner mold and the screw thread die set of joint close is hot-forming up and down; The compacting screw thread die set of pin end does not all have injecting hole and steam vent; And the compacting of female threaded pipe end adopts outer pipe mold and internal thread extrusion die to carry out hot extrusion molding; Outer pipe mold entangles the extruded pipe end, with the moulding of internal thread extrusion die hot extrusion extruded pipe inwall.
2, the preparation method with plastics wall casing of specific negative and positive screw thread according to claim 1: it is characterized in that the female threaded pipe end of wall casing is located at the processing employing mould extrusion modling mode of the sleeve of expansion, wherein mould comprises complete outer mold and inner mold, wherein outer mold adopts the outer cavity structure of expansion back sleeve, the inner mold end is provided with screw thread, the heating back adopts the rotation fashion of extrusion to clamp-on simultaneously in the pipe, and the temperature of moulding is 110-130 degree centigrade for U-PVC; Mode of heating adopts the high frequency coil induction mode.
3, the preparation method with plastics wall casing of specific negative and positive screw thread according to claim 1: it is characterized in that the inner mold structure is, the length that the column structure end is provided with pin thread equals to be provided with the length of negative thread inwall, is provided with sealing dome perpendicular to the column face apart from pin thread length place, end at inner mold; And to be provided with pin thread identical with the modulus that the urceolus of tube wall is provided with pin thread in the end.
4, the preparation method with plastics wall casing of specific negative and positive screw thread according to claim 1: it is characterized in that the wall casing center is lined with the inner mold of coating release agent simultaneously.
5, the preparation method with plastics wall casing of specific negative and positive screw thread according to claim 1: it is characterized in that being provided with the moulded plastic pipe mold, the compacting of pin end by inner mold and up and down the screw thread die set of joint close all do not have injecting hole and steam vent; Adopt the screw thread die set of joint close up and down, and two moulds that the cross section all is semicircles about being; Adopt the mistakes tight fit of mold cavity, be provided with a material accumulation when the equally distributed convex tendon of n bar is used to hold extruding on the mould.
6, the preparation method with plastics wall casing of specific negative and positive screw thread according to claim 5: it is characterized in that described outer pipe mold upper orifice end is provided with the ring-type seam.
7, the preparation method with plastics wall casing of specific negative and positive screw thread according to claim 2: inner mold rotating stripping demoulding when it is characterized in that the negative thread demoulding of wall casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100231631A CN100516388C (en) | 2007-06-07 | 2007-06-07 | Well wall pipe with special concavo-convex thread and producing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100231631A CN100516388C (en) | 2007-06-07 | 2007-06-07 | Well wall pipe with special concavo-convex thread and producing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101067305A CN101067305A (en) | 2007-11-07 |
| CN100516388C true CN100516388C (en) | 2009-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100231631A Expired - Fee Related CN100516388C (en) | 2007-06-07 | 2007-06-07 | Well wall pipe with special concavo-convex thread and producing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100516388C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644443A (en) * | 2012-05-09 | 2012-08-22 | 于建新 | Multifunctional casing pipe and preparation method thereof |
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2007
- 2007-06-07 CN CNB2007100231631A patent/CN100516388C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN101067305A (en) | 2007-11-07 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Jiangyin Xingyu Plastic Co., Ltd. Assignor: Yu Jianxin Contract record no.: 2012320000565 Denomination of invention: Well wall pipe with special concavo-convex thread and producing method thereof Granted publication date: 20090722 License type: Exclusive License Open date: 20071107 Record date: 20120428 |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090722 Termination date: 20130607 |