CN203384514U - High-pressure flexible rubber hose - Google Patents
High-pressure flexible rubber hose Download PDFInfo
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- CN203384514U CN203384514U CN201320482240.0U CN201320482240U CN203384514U CN 203384514 U CN203384514 U CN 203384514U CN 201320482240 U CN201320482240 U CN 201320482240U CN 203384514 U CN203384514 U CN 203384514U
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Abstract
The utility model provides a high-pressure flexible rubber hose. The high-pressure flexible rubber hose comprises an inner hemihedral-crystal-shaped thermoplastic plastic liner, an inner adhesive plaster layer, a steel wire rope enhancement layer, a bonding buffering middle adhesive layer, a thermal insulating layer and a fireproof flame retardant layer from inside to outside. When the hose is connected, the end of the hose is inserted into a connecting and sealing area of a connector, and the end of the hose, a sealing component, resin playing a role in cross linking and the metal connector are connected into a whole. The high-pressure flexible rubber hose shows excellent flexibleness, high pressure resistance, gas permeation resistance and high-temperature resistance in use.
Description
Technical field
The utility model belongs to the rubber product technical field, relates to a kind of structure and installation manufacture method of high-pressure flexible rubber hose.
Background technique
In oil drilling and exploitation, need the high pressure hose of a kind of heavy caliber (51～127mm) for delivery of gas, liquid or gas liquid mixture.This class flexible pipe has two outstanding features, and the one, owing to containing H in gas
2the corrosive gas of S class, this class gas has very strong corrosive action for the rubber of common class, can see through interior glue penetration in the high pressure hose body, during pressure decreased in body, the high pressure air that interior glue outside is gathered is known from experience the formation bubble, interior glue is released to endoporus, stopped up body, cause the flexible pipe earlier period damage.The 2nd, this flexible pipe is used under Flammable atmosphere, for safety requires hose surface to have fire prevention, fire-retardant and heat-shielding performance, once breaking out of fire, at high temperature, can continue work a period of time, guarantees the safety shutdown of equipment.
In the prior art of carrying gas or gas liquid mixture high pressure hose, what generally adopt is the non-adhesion technique structure of thermoplastic, be respectively the support rib rack-layer of square steel fine pitch winding, pressure-bearing framework layer and the outer plastic layer that the square steel large screw pitch is wound around in the outside of inner plastic layer, between each layer, be all not bonding, just form an assemblying body, can mutually move between adjacent layer when hose movement.Its advantage is that technique is simple, and manufacturing efficiency is high, can realize the production of big-length.Its shortcoming is that bending radius is large, inside and outside be the thermoplastic plastic layer, there is no elasticity, easily produce creep, particularly, under High Temperature High Pressure impact, creep causes seal failure often.External application plastics simultaneously, middle each layer is all to be wound around combination, does not seal, can not permeate, if the outer cover breakage enters seawater, will cause annular space metallic material corrosion and lost efficacy.Particularly easily in temperatures involved, external force, stretch and draw, during the framework layer slippage under pulsating pressure, cause the elongation of inner plastic layer and wrinkling, cause especially the factor of defective hose.
Also having a kind of structural manufacturing process is rubber-type, inside liner adopts rubber elastomer, a little less than the ability of rubber elastomer opposing conveying gas liquid mixture medium, inevitably have infiltration in the use of flexible pipe, in the situation that the pressure alternation causes air entrapment, even, in the situation that stainless steel inner lining is arranged, also can produce bubble, and cause the stainless steel sleeve of liner to lose efficacy.
The model utility content
The purpose of this utility model is to provide a kind of and is used in oil drilling and exploitation; heavy caliber high pressure flexible pipe for delivery of gas, liquid or gas liquid mixture; the technical thought that this flexible pipe adopts rubber to combine with plastics; adopt plastic inner lining effectively to defend the infiltration of gas; and be cross-linked into one with the vulcanization of rubber; adopting heat insulation and outer protection fire resistant flame retardant, is a kind of novel hose technology.
The utility model adopts following technological scheme:
Hose construction as shown in Figure 1; comprise from inside to outside interior stainless steel spiral bushing, bonding and buffer layer, hemicrystalline thermoplastic lining, bonding and buffer layer, interior carcass, wire rope enhancement layer, bonding buffering mesoglea, thermal-protective coating, fire resistant flame retardant layer, the stainless steel external protection.
The structure of stainless steel screw-casing that yet can be inside and outside under some environment, as shown in Figure 2, do not have interior stainless steel spiral bushing 1, bonding and buffer layer 2 and stainless steel external protection 10.
The end of flexible pipe is inserted into connection and the seal area of joint, with resin, the metal joint of sealed member, a crosslinked action, links into an integrated entity fully, as shown in Figure 3, Figure 4.
Wherein, interior stainless steel spiral bushing 1, be after with stainless steel sheets, it being bent to definite shape, and the flexible pipe box through spiral winding, fastening compacting, play the effect of isolation fed sheet of a media and supporting plastic liner;
Hemicrystalline thermoplastic lining 3, can in plastics, choose, wherein olefines is best, being beneficial to grafting rubbers crosslinkedly, as polypropylene, polyethylene, is secondly the polyamide-based of different molecular weight, as nylon 1～nylon 12, remaining can select thermoplastic polyester elastomer, and that the design adopts is polyvinylidene fluoride (PVDF), adopts and extrudes in advance or the on-the-spot technique of extruding.Make inside liner there is good chemical resistance, good high temperature resistant modification and oxidative resistance, there is good wear resistance, pliability, very high anti-intensity and the impact resistance intensity of rising.
Bonding and buffer layer 2, be the assemblying body of tackiness agent and buffering adhesive, and tackiness agent adopts the Kai Muluoke brushing at the outside of stainless steel screw-casing and the inner and outer surface of plastic inner lining cover, is beneficial to the bonding of buffering adhesive and metal, and buffering adhesive is rubber elastomer.In the situation that there is no interior stainless steel screw-casing in Fig. 2, there is no bonding and buffer layer 2 yet.
Wire rope enhancement layer 6, according to the pressure demand of flexible pipe, can be steel wire, the wire rope material of multilayer adhesive structure, plays the anti-compression resistance effect of body.Be generally the cross winding of 2～8 layers.
Thermal-protective coating 8, be with cord or the canvas of glass fibre weaving, after gluing or rubberizing, is wrapped on body, plays the protective action of refractory heat-insulating.
Fire resistant flame retardant layer 9, be with the high synthetic cement of oxygen index, as neoprene, chlorosulfonated polyethylene rubber, ternary the third rubber etc., through adding mixed rubber or the plastics elastic body of fire retardant.
Stainless steel external protection 10, material is identical with processing method and 1, for outside antisitic defect protection, can abandon and add according to Environmental Conditions.
Flexible pipe of the present utility model has adopted the semi-crystal thermoplastic as Lining Hose in the pipe structure design, avoided gas in carrying to exosmosis, adopted built-in stainless steel screw-casing, not only having supported the product of producing in sulfuration deviates from, length deformation in also using for flexible pipe is unloaded provides pulling force, and more flexible pipe plastic creep in use provides to internal strain, foaming and layering and provides support;
Flexible pipe of the present utility model has adopted the adhering technique of the rubber cross of each interlayer in pipe structure design, can effectively eliminate each layer in hose construction displacement and creep, also for the corrosion after abrasion, galvanic corrosion and the seepage of each interlayer, provide protection;
Flexible pipe of the present utility model has structurally adopted thermal-protective coating and fire resistant flame retardant layer structure, and flexible pipe self has the ability of the self-protection done, and can effectively prevent in the situation that accident is caught fire to the damage of flexible pipe, makes flexible pipe can reach specific fire-resistant requirement.
Flexible pipe of the present utility model in use shows excellent ductility, barotolerance, gasproof body permeability, heat-resisting quantity, through test, records, and under 704 ° of degree centigrades, still can continue work 30 minutes.
The connector connecting method of the utility model mesohigh flexible rubber hose is as follows:
After flexible pipe inserts joint (11), hemicrystalline thermoplastic lining (3) and metallic sheath (18) insert respectively in the corresponding seam of joint (11), by resin (19), joint (11) and body are connected to one;
Seal area (12) is seal groove, and processing is upper at joint (11), is positioned at the seam that hemicrystalline thermoplastic lining (3) inserts; The seal ring that seal ring (13) was settled by when assembling and the sealer entered while annotating sealer form, and stop sealer to flow to the effect of seal area (12); Joint and body are connected and fixed sealer on rear notes (16); Seal ring (17) prevention sealer (16) contacts with resin (19); Seal area (12), seal ring (13), sealer (16), seal ring (17) have formed sealed member;
Stainless steel sleeve (14) supports hemicrystalline thermoplastic lining (3); After expansion, hemicrystalline thermoplastic materials lining (3) is contacted to sealing with the seal area (12) on joint (11).
Metallic sheath (18) is hollow cylindrical, is enclosed within hemicrystalline thermoplastic lining (3) outside, during assembling, is inserted on joint in corresponding seam, plays centralized positioning and seal action with joint (11).
Pipe structure of the present utility model has following features: built-in stainless steel sleeve screw-casing structure, utilize the semi-crystal thermoplastic to do liner, stainless steel, plastics and rubber adhesion technology, epoxy resin bonding interconnection technique, insulating layer structure, fire resistant flame retardant external protection structure;
The utility model hose construction adopts inside and outside stainless steel spiral jacket layer; internal layer is in order to resist owing to existing in body after gas permeation rubber elasticity liner; when pulse, build-up of pressure decline bubble occurs and arranges, and outside is the protection in order to prevent outer damage to arrange.Owing to having increased the stainless steel screw-casing, support for the elastomer liner provides the bubble phenomenon caused due to osmotic pressure, each interlayer is all crosslinked together, not there will be creep, for body is connected joint and seal is provided with joint, and in the impact of high temperature, high pressure and medium and do not lose efficacy; The utility model adopts the semi-crystal thermoplastic corrosion-resistant, that tightness is good as liner, replaced rubber elastomer liner of the prior art, and solved the adhesion problem of plastics and stainless steel and plastics and rubber, the every aspect that makes flexible pipe is after sulfuration, crosslinkedly becomes an elastic connection structure with skeleton.
The utility model, on joint connection manner, utilizes liner sealing art, the double seal of seal ring, the steel bushing that epoxy resin connects, sealing is controlled, the plastics intramedullary expansion becomes seal area to locate, utilize screw to carry out the seal area supercharging; These technical characteristicss provide sound assurance for the good sealability of the utility model.
The accompanying drawing explanation
The sectional view of a kind of structure that Fig. 1 is high-pressure flexible rubber hose;
The sectional view of the another kind of structure that Fig. 2 is high-pressure flexible rubber hose;
The structure sectional view that the joint that Fig. 3 is the first high-pressure flexible rubber hose connects;
The structure sectional view that the joint that Fig. 4 is the second high-pressure flexible rubber hose connects;
Wherein: 1 interior stainless steel spiral bushing, 2 bonding and buffer layers one, 3 hemicrystalline thermoplastic linings, 2 bonding and buffer layer two, 5 interior carcass, 6 wire rope enhancement layers, 7 bonding buffering mesoglea, 8 thermal-protective coatings, 9 fire resistant flame retardant layers, 10 stainless steel external protections, 11 metal joints, 12 seal areas, 13 seal rings, 14 stainless steel sleeves, 15 screws, 16 sealers, 17 seal rings, 18 metallic sheaths, 19 resins, 20 cone-shaped metal covers.
Embodiment
Describe the utility model below in conjunction with accompanying drawing in detail by specific embodiment:
Embodiment 1:
High-pressure flexible rubber hose as shown in Figure 3; include from inside to outside interior stainless steel spiral bushing, bonding and buffer layer one, hemicrystalline thermoplastic lining, bonding and buffer layer two, interior carcass, wire rope enhancement layer, bonding buffering mesoglea, thermal-protective coating, fire resistant flame retardant layer, the stainless steel external protection.Shown in Fig. 3 is a kind of joint connection manner that the typical tube body structure of inside and outside stainless steel screw-casing is arranged:
After flexible pipe inserts joint 11, hemicrystalline thermoplastic lining 3 and metallic sheath insert respectively in the corresponding seam of joint 11, by resin 19, joint and body are connected to one.Resin is the runny double-component of high strength, and preferably epoxy resin, after solidifying connect as one body and joint;
Seal area 12 is to process on joint 11, is positioned at the seam that hemicrystalline thermoplastic lining 3 inserts, and through the multiple tracks ring-type arc seal groove of processing, can be also the annular slot of other shapes.By after stainless steel sleeve 14 expanding extrudings, hemicrystalline thermoplastic lining 3 is also expansion thereupon at this position, forms one section multiple-grooved seal area after being expressed to seal groove, is the first potted line;
The O RunddichtringO that seal ring 13 was settled by when assembling and the sealer entered while annotating sealer form, and are to stop sealer to flow to the effect of seal area 12 in process of production, in product, are the second seal arrangements;
Stainless steel sleeve 14 is constituent elements of joint assembling, works hemicrystalline thermoplastic lining 3 effects of supporting;
The sealing of screw 15 during for injecting glue and the sealing load of product are regulated.
Seal ring 17 seals, and prevention sealer 16 contacts with resin 19;
Outer stainless protection layer 10 use argon arc weldings are welded on joint 11.
Embodiment 2:
As figure: the high-pressure flexible rubber hose as shown in the of 4 includes interior stainless steel spiral bushing, bonding and buffer layer one, hemicrystalline thermoplastic lining, bonding and buffer layer two, interior carcass, wire rope enhancement layer, bonding buffering mesoglea, thermal-protective coating, fire resistant flame retardant layer from inside to outside.As shown in Figure 4; it is a kind of interior stainless steel screw-casing that has; the joint connection manner that outside does not have stainless steel screw-casing external protection pipe structure, lacked seal area 12 in structure, seal ring 13 is changed into and acted on taper sheath by acting on hemicrystalline thermoplastic lining 3.
After flexible pipe inserts joint 11, hemicrystalline thermoplastic lining 3 and metallic sheath 18 insert respectively in the corresponding seam of joint 11, by resin 19, joint and body are connected to one.Resin is the runny double-component of high strength, and preferably epoxy resin, after solidifying connect as one body and joint;
The O RunddichtringO that seal ring 13 was settled by when assembling and the sealer entered while annotating sealer form, be in process of production to stop sealer flow the effect of connection area, and in product, be the first seal arrangement;
The seal action of screw 15 during for injecting glue and the sealing load regulating action of product.
Seal ring 17 seals, and prevention sealer 16 contacts with resin 19;
Cone-shaped metal cover 20 is constituent elements of joint assembling, works hemicrystalline thermoplastic lining 3 effects of supporting.
Embodiment 3:
According to above-mentioned hose construction design, produced the air hose of 76mm inner diameter, this flexible pipe working pressure 52Mpa.Lay cushion gum layer after the surperficial coated with adhesive of interior stainless steel screw-casing 1, place hemicrystalline thermoplastic lining, lining wall thickness 4mm, by PVDF, manufactured, inside and outside coated with adhesive, lay buffering adhesive, carcass in upper foundation, after being wound around 4 layers, polyester canvas, being wound around 4 layers of 4.5mm wire rope and doing the flexible pipe framework layer and bear burst strength.At the interlayer of every layer of wire rope with inside and outsidely lay bonding buffering mesoglea, in wirerope-winding, be laid on wherein, after sulfuration, be filled in the wire rope gap, be bonded in the surface of wire rope, play buffering cushion and adhesive effect.Cord or canvas with the glass fibre weaving; after gluing, be wrapped on body; the high synthetic cement with oxygen index; as neoprene, chlorosulfonated polyethylene, ternary third gradegrade C rubber; through adding the mixed rubber elastomer of fire retardant; play the protective action of refractory heat-insulating, lay outer protection stainless steel screw-casing.Through flexible pipe being carried out to room temperature static pressure test ,-35 ℃ of low temperature bend tests, cold bending test, 120 ℃ of high temperature low-frequency pulses tests, contact testing, fire testing, high-temperature heating test, reach standard-required.
Testing property
Hemicrystalline thermoplastic lining in embodiment 1 adopts respectively polypropylene, nylon 11, PET, PVDF, does following experimental control: (results of comparison in Table)
Test objective: investigate the low temperature compression resistance of tubing, anticorrosive anti-permeability performance, mechanical property.
Test conditions:
1, inside static pressure test
At least 10 feet of body length. flexible pipe boosts to test pressure pressurize one hour, and test is carried out at normal temperatures and records temperature, then pressure is risen to working pressure from 0Psi, repeats at least pressurize 5 minutes under working pressure each time at least 260 times.(after process of the test, with the endoscope check internal lining pipe, abnormal cracking damage etc. should not occur)
Table 1 inside static pressure test result
| Lagging material | | PET | Nylon | 11 | PVDF |
| Test result | Without abnormal | Without abnormal | Without abnormal | Without abnormal |
2, low temperature bend test
After inside static pressure has been tested, in the situation that there is no pressure, body is bent to minimum bending radius and carries out bending, body should at least be bent 90 °, under the ambient temperature of-35 ℃, body should be repeated crooked 100 times. and (after process of the test, with the endoscopy internal lining pipe, abnormal cracking damage etc. should not occur)
Table 2 low temperature bend test result
| Lagging material | | PET | Nylon | 11 | PVDF |
| Test result | Trickle slight crack | Do not ftracture | Do not ftracture | Do not ftracture |
3, cold bending test
Then temperature will return to normal temperature, and under the normal temperature situation, bending is proceeded at least 260 times. and then pressure is risen to working pressure, be bent to minimum bending radius, repeated flex is 260 times again. and in test visible leakage should not appear.
Table 3 cold bending test result
| Lagging material | | PET | Nylon | 11 | PVDF |
| Test result | Trickle slight crack | Do not ftracture | Do not ftracture | Do not ftracture |
4, bursting test
Flexuraltest will be carried out bursting test after finishing. and the speed of pressure rise should not surpass 1500Psi. per minute in the process of boosting, and visible leakage can not occur, and bursting pressure is not less than 2.25 times of standard-requireds of working pressure.(flexible pipe before reaching bursting pressure and outside the explosion position, it is abnormal that internal lining pipe should not occur that cracking damages etc.)
Table 4 bursting test result
| Lagging material | | PET | Nylon | 11 | PVDF |
| Test result | Cracking is arranged | Cracking is arranged | Do not ftracture | Do not ftracture |
5, permeability test
Below the main gas detected at the highest standard temperature of test infiltrates, and gas step-down and liquid infiltrate. and (medium that mixed medium meets API16C standard 9.4.4 clause requires)
First portion: suppress for the first time rated working pressure (15000PSI) pressurize 24 hours, second and suppress for the third time to rated working pressure pressurize 12 hours.After pressurize, the speed with 6.9Mpa per minute is carried out pressure release each time, between each pressurization, at least keeps 1 hour with no pressure.
Second portion: body pressure rises to rated working pressure and specified temperature, pressurize 7 days.After completing, temperature is down to normal temperature, then pressure is transferred to working pressure, pressurize at normal temperatures 30 days.
After 30 days, the body water carries out bulge test, and pressure should reach test pressure, pressurize 30 minutes.It is qualified that the test middle tube body is considered as without visible leakage.(above rated working pressure is 15000PSI; Above rated temperature is 130 ℃; The process of the test internal lining pipe should not occur that cracking, damage, corrosion etc. are abnormal)
Table 5 permeability test result
| Lagging material | | PET | Nylon | 11 | PVDF |
| Test result | Leak | Leak | Without leaking | Without leaking |
6, high temperature detects test
This test is to detect the maximum temperature that rubber tubing can bear at short notice under working pressure. what this test represented is urgent and crucial dangerous situation, should not be used to the temperature rank as body. and require body to detect through high temperature.
Rise to 177 ℃ of maximum temperatures with the speed of 2.8 ℃ of per hour rising, then keep 1 hour.After completing, with the speed of 2.8 ℃ of per hour rising, heat up, until body damages.The all time-temperatures that surpass 177 ℃ all should be recorded. sebific duct reaches working pressure, and test is under this temperature conditions
Table 6 high temperature detects test result
Claims (9)
1. a high-pressure flexible rubber hose, is characterized in that: include from inside to outside hemicrystalline thermoplastic lining, interior carcass, wire rope enhancement layer, bonding buffering mesoglea, thermal-protective coating, fire resistant flame retardant layer.
2. a kind of high-pressure flexible rubber hose according to claim 1; it is characterized in that: include from inside to outside interior stainless steel spiral bushing, bonding and buffer layer one, hemicrystalline thermoplastic lining, bonding and buffer layer two, interior carcass, wire rope enhancement layer, bonding buffering mesoglea, thermal-protective coating, fire resistant flame retardant layer, the stainless steel external protection.
3. a kind of high-pressure flexible rubber hose according to claim 1 and 2, is characterized in that: hemicrystalline thermoplastic lining employing olefines, polyamide-based or thermoplastic polyester class elastomer.
4. a kind of high-pressure flexible rubber hose according to claim 2, it is characterized in that: bonding and buffer layer one is assemblying bodys of tackiness agent and buffering adhesive with bonding and buffer layer two, the tackiness agent brushing is at the outside of stainless steel screw-casing and the inner and outer surface of hemicrystalline thermoplastic lining, and buffering adhesive is rubber elastomer.
5. a kind of high-pressure flexible rubber hose according to claim 1 and 2, it is characterized in that: interior carcass is fibercord or canvas, through dip-coating or after pasting rubber, is wrapped on body.
6. a kind of high-pressure flexible rubber hose according to claim 1 and 2, it is characterized in that: bonding buffering mesoglea is neoprene and natural gum and uses elastomeric compound, in wirerope-winding, be laid on inside and outside the interlayer and wire rope of wire rope, be filled in the wire rope gap after sulfuration, be bonded in the surface of wire rope.
7. a kind of high-pressure flexible rubber hose according to claim 1 and 2 is characterized in that: thermal-protective coating is with cord or the canvas of glass fibre weaving, after gluing or rubberizing, is wrapped on body.
8. a kind of high-pressure flexible rubber hose according to claim 1 and 2 is characterized in that: the fire resistant flame retardant layer is that the synthetic cement high with oxygen index is through adding mixed rubber or the plastics elastic body of fire retardant.
9. a kind of high-pressure flexible rubber hose according to claim 1 and 2, it is characterized in that: the wire rope enhancement layer is 2～8 layers of cross winding of different-diameter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320482240.0U CN203384514U (en) | 2013-08-08 | 2013-08-08 | High-pressure flexible rubber hose |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320482240.0U CN203384514U (en) | 2013-08-08 | 2013-08-08 | High-pressure flexible rubber hose |
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| CN203384514U true CN203384514U (en) | 2014-01-08 |
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| CN201320482240.0U Expired - Lifetime CN203384514U (en) | 2013-08-08 | 2013-08-08 | High-pressure flexible rubber hose |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398241A (en) * | 2013-08-08 | 2013-11-20 | 崔�国 | High-pressure flexible rubber hose and joint connecting method thereof |
| CN105816967A (en) * | 2016-03-25 | 2016-08-03 | 苏州萃智新技术开发有限公司 | Fire safety passage |
| CN107255192A (en) * | 2017-06-15 | 2017-10-17 | 刘锡多 | A kind of fire resisting high-pressure hose of resistance to hydrogen sulfide and preparation method thereof |
| CN109357087A (en) * | 2018-11-06 | 2019-02-19 | 东南大学 | A kind of pipeline antiknock safeguard structure and its construction method |
| CN110185855A (en) * | 2019-05-31 | 2019-08-30 | 洛阳恒基石化科技有限公司 | A kind of Grazing condition hose and preparation method thereof |
-
2013
- 2013-08-08 CN CN201320482240.0U patent/CN203384514U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398241A (en) * | 2013-08-08 | 2013-11-20 | 崔�国 | High-pressure flexible rubber hose and joint connecting method thereof |
| CN103398241B (en) * | 2013-08-08 | 2015-11-25 | 崔�国 | A kind of high-pressure flexible rubber hose and connector connecting method thereof |
| CN105816967A (en) * | 2016-03-25 | 2016-08-03 | 苏州萃智新技术开发有限公司 | Fire safety passage |
| CN107255192A (en) * | 2017-06-15 | 2017-10-17 | 刘锡多 | A kind of fire resisting high-pressure hose of resistance to hydrogen sulfide and preparation method thereof |
| CN109357087A (en) * | 2018-11-06 | 2019-02-19 | 东南大学 | A kind of pipeline antiknock safeguard structure and its construction method |
| CN110185855A (en) * | 2019-05-31 | 2019-08-30 | 洛阳恒基石化科技有限公司 | A kind of Grazing condition hose and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171117 Address after: 261414 Yantai City, Shandong, Pingli store town, Laizhou City Patentee after: SHANDONG YUELONG RUBBER AND PLASTIC TECHNOLOGY CO.,LTD. Address before: 255400 Shandong Province, Zibo city Linzi District Road No. 31 Xin Patentee before: Cui Guo |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140108 |