CN1313261C - Plastic piping turnup apparatus - Google Patents
Plastic piping turnup apparatus Download PDFInfo
- Publication number
- CN1313261C CN1313261C CNB031363725A CN03136372A CN1313261C CN 1313261 C CN1313261 C CN 1313261C CN B031363725 A CNB031363725 A CN B031363725A CN 03136372 A CN03136372 A CN 03136372A CN 1313261 C CN1313261 C CN 1313261C
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- flange
- plastic pipe
- die
- subdivision
- flanging
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention relates to a plastic pipe flanging device which is mainly composed of a pipe clamping assembly, a flanging mould, a screw rod driving assembly, a connection assembly and a heater, wherein one end of the flanging mould is provided with a flange, and the other end is provided with a tubular body. The tubular body is provided with an expanded conical surface segment; an annular groove is arranged in the flange. The opening annular electric heater is arranged in the inner cavity of the flanging mould. A division locking flange, a standard metallic flange, the flanging mould and a screw rod frame are orderly connected by the connection assembly and are regulated and positioned through the connection assembly. A handle of the rotary screw rod driving assembly extrudes the flanging mould to move axially through a top plate; the end part of the plastic pipe is formed by extruding and flanging. The present invention integrates the process steps of heating, flanging and shaping. The flanging and the forming of the pipe can be finished once on the same device without replacing moulds; the pipe and the standard metallic flange form a flanging flange connection pipe fitting. The present invention is suitable for flanging and forming polyethylene pipes with ultrahigh molecular weight and various thermoplastic pipes.
Description
Technical field
The present invention relates to a kind of plastic pipe hemmer, be applicable to the flange moulding of various thermoplastic plastic pipes, be specially adapted to the flange moulding of the ultrahigh molecular weight polyethylene tubing that is difficult to process or polytetrafluoroethyltubing tubing and constitute flange flange connections spare with the standard metal flange.
Background technology
Ultra-high molecular weight polyethylene is a viscosity average molecular weigh greater than 1,500,000 linear polyethylene, have wear-resisting, shock-resistant, self-lubricating, excellent comprehensive serviceability such as corrosion-resistant, ultrahigh molecular weight polyethylene tubing is used for the mass transport of pressed powder, solidliquid mixture, one of its pipe connecting method in construction is to adopt the flange flange to connect, promptly the end from ultrahigh molecular weight polyethylene tubing puts the standard metal flange, then flange is carried out in the tubing end, thereby realize the flange butt joint of pipeline.Because during the ultra-high molecular weight polyethylene fusion is high viscoelastic attitude, even temperature reaches fusing point, also almost do not have flowability, so the processing of the flange of ultrahigh molecular weight polyethylene tubing is more more difficult than general plastic pipe.The flange forming method of existing plastic conduit, as the turn-up process of polytetrafluoroethylene (PTFE) pipeline be earlier tubing is heated in heater softening after, tubing moved on to tentatively be shaped to horn mouth on the flange die, then tubing is removed from flange die, after heating, be put into again and be shaped to the typhon mouth on the flange die, again tubing is removed heating once more then, be placed on again and finish flange on the stock mould.The shortcoming of this method is that operation is many, and heating separates with turn-up process, inefficiency, and troublesome poeration, and occur the tubing flange easily during flange and break, can not guarantee the flange quality." plastic conduit flanger " (Chinese patent ZL 93236559.0) and " plastics rise a mouthful flanger " (Chinese patent ZL92208197.2) still need change flaring die and stock mould though method for flanging is improved in enlarging and typing operating process.
Summary of the invention
The purpose of this invention is to provide a kind of plastic pipe hemmer, with heating, flange, shaping process collection is one, does not need mold exchange more just can disposablely finish the flange moulding of tubing on same device and constitutes flange flange connections spare with the standard metal flange.Also can guarantee the quality of tubing flange processing for the comparatively difficult ultra-high molecular weight polyethylene plastic pipe of processing.
The present invention is the same with common tubing hemmer mainly to be made of tubing clamp assemblies, flange die, lead screw transmission assembly, heating system etc., by coupling assembling tubing clamp assemblies, flange die, lead screw transmission assembly are linked together, the present invention realizes by following technical scheme:
1, the tubing clamp assemblies comprises subdivision locking flange and bolts and nuts, and subdivision locking flange is enclosed within outer surface of plastic pipe running fix, by bolts and nuts subdivision is locked flange and is fixed on the plastic pipe.The lead screw transmission assembly comprises leading screw, leading screw frame, handle and top board, and rotary handle rotates the promotion top board by leading screw and moves axially, and top board is in end face of flange one side of flange die.One end of flange die is a flange, and the other end is a tubular body, and tubular body has the taper seat flared section, offers annular groove on the flange, and tubular body is inserted in the plastic pipe.Coupling assembling is made up of double-screw bolt, attaching nut and adjusting nut.Heater is an opening ring-type electric heater, is arranged in the inner chamber of flange die; Double-screw bolt by coupling assembling connects subdivision locking flange, standard metal flange, flange die and leading screw frame successively, and the attaching nut and the adjusting nut that pass through coupling assembling are regulated the location, the handle of rotating threaded shaft transmission component moves vertically by top board extruding flange die, the end of plastic pipe be squeezed flange and standard metal flange formation flange flange connections spare.
2, the subdivision of tubing clamp assemblies locking flange is that partly to cut open the flange other end be that the subdivision body that partly cuts open wheel flange constitutes by two one ends, partly cuing open on the bead of wheel flange both sides has bolt connecting hole, and the two subdivision bodies of subdivision being locked flange with screw bolt and nut connect as one.
3, between the surface of internal cavity of subdivision locking flange and outer surface of plastic pipe, be provided with the high-temperature resistant rubber plate.
4, the tubular body outer surface of flange die comprises taper seat introduction segment, face of cylinder flat segments, taper seat flared section, be the arc surface changeover portion of tangent connection between the taper seat flared section of tubular body and the annular groove bottom surface of flange, the external diameter of face of cylinder flat segments equals the internal diameter of plastic pipe.
5, the oblique angle of the taper seat flared section of the tubular body of flange die is 5～25 °.
6, the end face of flange of flange die is provided with thermocouple.
7, the leading screw frame of lead screw transmission assembly has four equally distributed connecting through hole, and the outer rim between adjacent two holes has the orthodrome breach.
8, the diameter of the outer rim of the top board of lead screw transmission assembly is greater than the diameter of flange die inner chamber, and top board has four equally distributed arc gaps.
9, heater is an opening ring-type electric heater, and the aperture pitch of opening ring-shaped heater is 7～10mm, and the radius of curvature of the ring arc of opening ring-shaped heater is than the big 0.5mm of radius of flange die inner chamber.
The plastic pipe hemmer that the present invention proposes is applicable to the flange processing and forming of the various thermoplastic plastic pipes that comprise ultra-high molecular weight polyethylene, polytetrafluoroethylene (PTFE), polypropylene, polyethylene, acrylonitrile/butadiene/styrene copolymer.
A kind of plastic pipe hemmer of the present invention have device simple, be one with operation collection such as heating, flange, typings, operational sequence is easy, efficient is higher, flange reliable quality characteristics.
Description of drawings
Fig. 1 is the structural representation of a kind of plastic pipe hemmer of the present invention;
Fig. 2 is the dextrad view of Fig. 1;
Fig. 3 is the flange die structural representation of a kind of plastic pipe hemmer of the present invention;
Fig. 4 is the leading screw shelf structure schematic diagram of a kind of plastic pipe hemmer of the present invention.
Fig. 5 is the top board structure schematic diagram of a kind of plastic pipe hemmer of the present invention.
In above figure: (1) plastic pipe; (2) high-temperature resistant rubber plate; (3) subdivision locking flange; (4) standard metal flange; (5) heater; (6) flange die; (7) thermocouple; (8) double-screw bolt; (9) top board; (10) leading screw frame; (11) leading screw; (12) handle; (13) bolt; (14) nut; (15) attaching nut; (16) adjusting nut.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
When Fig. 1 and Fig. 2 are plastic pipe hemmer of the present invention work and the structural representation that is installed together of plastic pipe (1) and standard metal flange (4).Tubing clamp assemblies of the present invention comprises subdivision locking flange (3) and bolt (13) and nut (14), subdivision locking flange (3) is installed on the outer surface of plastic pipe (1), and can go up at plastic pipe (1) and move, after determining the position, by bolt (13) and nut (14) subdivision is locked flange (3) and be fixed on the plastic pipe (1).Subdivision locking flange (3) is that partly to cut open flange (3-1) other end be that two subdivision bodies that partly cut open wheel flange (3-2) constitute by an end, partly cuing open on the bead (3-3) of wheel flange (3-2) both sides has the Bolt Connection hole, and two subdivision bodies of subdivision being locked flange with bolt (13) connect as one.In order to prevent the slippage of plastic pipe in process (1), between the outer surface of the surface of internal cavity of subdivision locking flange (3) and plastic pipe (1), add high-temperature resistant rubber plate (2), the thickness of high-temperature resistant rubber plate (2) is 1～5mm, selects the high-temperature resistant rubber plate (2) of 160 ℃ of heatproofs for ultrahigh molecular weight polyethylene tubing.The lead screw transmission assembly comprises leading screw (11), leading screw frame (10), handle (12) and top board (9), and rotary handle (12) rotates promotion top board (9) by leading screw (10) and moves axially.The leading screw frame (10) of lead screw transmission assembly as shown in Figure 4, it has four equally distributed connecting through hole (10-1), the orthodrome breach (10-2) of the promising weight reduction of outer rim between adjacent two holes.The top board of lead screw transmission assembly (9) as shown in Figure 5, the diameter of its outer rim (9-1) is greater than the diameter of flange die inner chamber, the outer rim of top board (9) has four to be the arc gap of weight reduction (9-2).
Coupling assembling of the present invention is made up of double-screw bolt (8), attaching nut (15) and adjusting nut (16).Double-screw bolt (8) by coupling assembling connects subdivision locking flange (3), standard metal flange (4), flange die (6) and leading screw frame (10) successively, and the attaching nut (15) by coupling assembling and adjusting nut (16) are regulated the location, the handle of rotating threaded shaft transmission component (12) moves vertically by top board (9) extruding flange die (6), the end of plastic pipe (1) be squeezed flange and standard metal flange (4) formation flange flange connections spare.
Flange die of the present invention (6) as shown in Figure 3, it an end be flange (6-1), the other end is tubular body (6-2), and tubular body (6-2) has taper seat flared section (6c), offers the annular groove (6-3) identical with the flange shape of plastic pipe (1) on the flange (6-1).There is thermocouple jack (6-4) position near tubular body (6-2) inner chamber on the end face of flange (6-1), thermocouple (7) (as shown in Figure 1) is set in the thermocouple jack (6-4), with the temperature of thermocouple (7) measurement flange die (6), in order to the heated temperature of control plastic pipe (1).The outer surface of the tubular body (6-2) of flange die (6) comprises taper seat introduction segment (6a), face of cylinder flat segments (6b) and taper seat flared section (6c), is the arc surface changeover portion (6d) of tangent connection between the taper seat flared section (6c) of tubular body and the annular groove bottom surface (6e) of flange.The external diameter of face of cylinder flat segments (6a) equals the internal diameter of plastic pipe (1), and the oblique angle θ of taper seat flared section (6c) is 5～25 °.When the θ value is excessive, mouth of pipe thinner thickness behind plastic pipe (1) flange, and " V " shape space that two pipe joints form after flange connects is excessive, and easily stagnant material when the θ value is too small, was difficult to realize enlarging when tubing was carried during plastic pipe (1) flange.
The used heater (as depicted in figs. 1 and 2) of the present invention is arranged in the inner chamber of flange die (6), and heater (5) adopts commercially available opening ring-type electric heater, and (for example: power density is 3W/cm
2Opening ring-type mica electric heater), the ring arc radius of curvature of heater (5) is than the big 0.5mm of radius of flange die (6) inner chamber, the aperture pitch of opening ring-shaped heater is about 7～10mm.Like this, after the opening ring-shaped heater was installed in the inner chamber of flange die (6), as shown in Figure 2, the aperture pitch H of opening ring-shaped heater became 3～6mm, and the radius of curvature of ring arc equals the radius of flange die inner chamber.Like this, opening ring-type electric heater can closely contact with the inner chamber wall of flange die (6), helps improving adding thermal effect.The heater (5) that the present invention is used and the wiring of thermocouple (7) are derived between the arc gap (9-1) (as shown in Figure 5) of the top board (9) of lead screw transmission assembly and the leading screw frame (10).
A kind of plastic pipe hemmer of the present invention as depicted in figs. 1 and 2, two subdivision locking flanges (3) are enclosed near the position that plastic pipe (1) is wanted flange one end, be connected the bead (3-3) of two subdivisions locking flange (3) both sides with nut (14) with bolt (13), between the surface of internal cavity that partly cuts open wheel flange (3-2) of outer surface that plastic pipe (1) is held and locking flange (3), fill up with high-temperature resistant rubber plate (2).Put the standard metal flange (4) that connects usefulness for pipeline from plastic pipe (1) end, and make it abut against a side of subdivision locking flange (3), regulate subdivision locking flange (3) and the position of standard metal flange (4) on tubing, the length S that makes the termination of plastic pipe (1) exceed standard metal flange (4) outer face is less than or equal to standard metal flange (4) internal chamber wall and connects the radial distance of hole wall to standard metal flange (4), and the flange (width be about S) of plastic pipe (1) through processing is unlikely to influence moulding because of double-screw bolt (8) like this.Tight a bolt (13) and nut (14) are locked on the plastic pipe (1) subdivision locking flange (3) and high-temperature resistant rubber plate (2) fully.Flange die (6) insertion plastic pipe (1) is locked flange (3), standard metal flange (4) and flange die (6) with four double-screw bolts (8) with subdivision to be connected, end at double-screw bolt (8) screws on attaching nut (15), goes into adjusting nut (16) at a sidespin of flange die (6).The leading screw frame (10) that will screw in leading screw (11) is enclosed within on four double-screw bolts (8), uses attaching nut (15) fastening then.With the outer face of top board (9) pad at the flange (6-1) of flange die (6), regulate its position and make itself and flange die (6) almost coaxial, can draw from top board (9) at the lead of the electric heater (5) of tubular body (6-2) inner chamber of flange die (6) and the lead that is installed in the thermocouple (7) on flange (6-1) outer face of flange die (6).By regulate leading screw frame (10) on double-screw bolt (8) the position or with handle (12) adjusting leading screw (11), make leading screw (11) withstand top board (9), top board (9) withstands flange die (6) again, last fastening all attaching nuts (15) fully, and hemmer installs.
The course of work of a kind of plastic pipe hemmer of the present invention is as follows: connect heater (5), make flange die (6) be warming up to design temperature (softening temperature that is generally plastic pipe is to the melting temperature scope), flange die (6) conducts heat and gives plastic pipe (1), make tubular body (6-2) contact portion of itself and flange die (6) be subjected to thermal softening, shake handle (12) then and make leading screw (11) leading screw frame (10) screw-in relatively, leading screw (11) extruding top board (9), the stressed extruding flange die of top board (9) (6), flange die (6) is along double-screw bolt (8) axial advancement and extruding plastic tubing (1), under the taper seat flared section (6c) and arc surface changeover portion (6d) guide effect of flange die (6), the part that plastic pipe (1) exposes standard metal flange (4) enlarging and turning up gradually, and enter in the annular groove of flange of flange die (6), because the barrier effect of annular groove wall (6f), plastic pipe (1) the part ring type filling connected in star gradually that turns up, along with the turn up increasing of degree of plastic pipe (1), the resistance of leading screw (11) precession increases, regulate four adjusting nuts (16) with spanner this moment, make flange die (6) overcome resistance and continue reach, up to plastic pipe (1) turn up part fully compacting in the annular groove (6-3) of the flange of the end face of standard metal flange (4) and flange die (6), this moment standard metal flange (4) and flange die (6) the end face of flange (6-1) between only stay minim gap.Insulation a period of time, and regulate four adjusting nuts (16) and plastic pipe (1) flange partly is stressed evenly keeping, cooling (air cools off or the cooling of drying naturally) gradually then, after making the complete curing molding of plastic pipe (1) flange part, shed hemmer, promptly obtain being with the plastic pipe with turnup structure of standard metal flange (4), the flange that can be used for plastic pipe connects.
The present invention is an one with operation collection such as heating, flange, typings, does not need more the mold exchange just can the disposable turn-up process of finishing tubing on same device.Comparatively the plastic pipe of difficulty also can a flange moulding in this class processing for ultra-high molecular weight polyethylene.The present invention also is applicable to the flange processing and forming of polytetrafluoroethylene (PTFE), polyvinyl chloride, polypropylene, polyethylene, acrylonitrile/butadiene/styrene copolymer (ABS) and various thermoplastic plastic pipes.That the present invention has is simple in structure, operational sequence is easy, efficient is higher, the measured advantage of flange matter.
The present invention is used to process the hemmer of Φ 219mm ultra-high molecular weight polyethylene plastic pipe, the pipe fitting that processing is made up of Φ 219 * 15.5mm ultra-high molecular weight polyethylene plastic pipe and the effective standard metal flange of Φ 219mm.The tubular body external diameter Φ 188mm of flange die, the intracavity diameter Φ 178mm of tubular body, 12 ° at the oblique angle of the taper seat flared section of tubular body.Heater is commercially available power density 3W/cm
2, power 800W opening ring-type mica electric heater.The aperture pitch of opening ring-shaped heater is 9mm, and the radius of curvature of the ring arc of opening ring-shaped heater is 89.5mm.
The present invention is used to process the hemmer of Φ 325mm ultra-high molecular weight polyethylene plastic pipe, the pipe fitting that processing is made up of Φ 325 * 16mm ultra-high molecular weight polyethylene plastic pipe and the effective standard metal flange of Φ 325mm.The tubular body external diameter Φ 293mm of flange die, the intracavity diameter Φ 278mm of tubular body, 8 ° at the oblique angle of the taper seat flared section of tubular body.Heater is commercially available power density 3W/cm
2, power 2300W opening ring-type mica electric heater.The aperture pitch of opening ring-shaped heater is 8mm, and the radius of curvature of the ring arc of opening ring-shaped heater is 139.5mm.With the flange superhigh molecular weight polyethylene pipe spare of equipment processing of the present invention, the flange smooth surface of tubing is smooth, up-to-standard.
Claims (9)
1, a kind of plastic pipe hemmer comprises tubing clamp assemblies, flange die, lead screw transmission assembly, coupling assembling and heating system, by coupling assembling tubing clamp assemblies, flange die, lead screw transmission assembly is linked together, and it is characterized in that:
(1) the tubing clamp assemblies comprises subdivision locking flange and bolts and nuts, is provided with the high-temperature resistant rubber plate between the surface of internal cavity of subdivision locking flange and outer surface of plastic pipe; Subdivision locking flange is enclosed within outer surface of plastic pipe running fix, by bolts and nuts subdivision is locked flange and is fixed on the plastic pipe;
(2) the lead screw transmission assembly comprises leading screw, leading screw frame, handle and top board, and rotary handle rotates the promotion top board by leading screw and moves axially, and top board is in end face of flange one side of flange die;
(3) end of flange die is a flange, and the other end is a tubular body, and tubular body has the taper seat flared section, offers annular groove on the flange, and tubular body is inserted in the plastic pipe;
(4) coupling assembling is made up of double-screw bolt, attaching nut and adjusting nut;
(5) heater is an opening ring-type electric heater, is arranged in the inner chamber of flange die; Double-screw bolt by coupling assembling connects subdivision locking flange, standard metal flange, flange die and leading screw frame successively, and the attaching nut and the adjusting nut that pass through coupling assembling are regulated the location, the handle of rotating threaded shaft transmission component moves vertically by top board extruding flange die, the end of plastic pipe be squeezed flange and standard metal flange formation flange flange connections spare.
2, plastic pipe hemmer according to claim 1, it is characterized in that: the subdivision of tubing clamp assemblies locking flange is that partly to cut open the flange other end be that the subdivision body that partly cuts open wheel flange constitutes by two one ends, partly cuing open on the bead of wheel flange both sides has bolt connecting hole, and the two subdivision bodies of subdivision being locked flange with screw bolt and nut connect as one.
3, plastic pipe hemmer according to claim 1, it is characterized in that: the tubular body outer surface of flange die comprises taper seat introduction segment, face of cylinder flat segments, taper seat flared section, be the arc surface changeover portion of tangent connection between the taper seat flared section of tubular body and the annular groove bottom surface of flange, the external diameter of face of cylinder flat segments equals the internal diameter of plastic pipe.
4, according to claim 1 or 4 described plastic pipe hemmers, it is characterized in that: the oblique angle of the taper seat flared section of the tubular body of flange die is 5～25 °.
5, plastic pipe hemmer according to claim 1, it is characterized in that: the end face of flange of flange die is provided with thermocouple.
6, plastic pipe hemmer according to claim 1 is characterized in that: the leading screw frame of lead screw transmission assembly has four equally distributed connecting through hole, and the outer rim between adjacent two holes has the orthodrome breach.
7, plastic pipe hemmer according to claim 1 is characterized in that: the diameter of the outer rim of the top board of lead screw transmission assembly is greater than the diameter of flange die inner chamber, and top board has four equally distributed arc gaps.
8, plastic pipe hemmer according to claim 1, it is characterized in that: heater is an opening ring-type electric heater, the aperture pitch of opening ring-shaped heater is 7～10mm, and the radius of curvature of the ring arc of opening ring-shaped heater is than the big 0.5mm of radius of flange die inner chamber.
9, plastic pipe hemmer according to claim 1 is applicable to the flange processing and forming of the thermoplastic plastic pipe that comprises ultra-high molecular weight polyethylene, polytetrafluoroethylene (PTFE), polypropylene, polyethylene, acrylonitrile/butadiene/styrene copolymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031363725A CN1313261C (en) | 2003-06-03 | 2003-06-03 | Plastic piping turnup apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031363725A CN1313261C (en) | 2003-06-03 | 2003-06-03 | Plastic piping turnup apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1552565A CN1552565A (en) | 2004-12-08 |
| CN1313261C true CN1313261C (en) | 2007-05-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031363725A Expired - Fee Related CN1313261C (en) | 2003-06-03 | 2003-06-03 | Plastic piping turnup apparatus |
Country Status (1)
| Country | Link |
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| CN (1) | CN1313261C (en) |
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| CN101767450A (en) * | 2010-03-09 | 2010-07-07 | 攀钢集团冶金工程技术有限公司 | Flanging device and flanging method of superhigh molecular weight polyethylene pipe |
| CN103317712A (en) * | 2013-06-21 | 2013-09-25 | 顾施忠 | Corrosion-resistant plastic flanging clamp of storage tank support opening |
| CN103707500B (en) * | 2013-12-30 | 2016-01-06 | 北京工业大学 | Plastic pipe flanging device and using method |
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| CN106142525B (en) * | 2016-07-06 | 2018-10-12 | 重庆永高塑业发展有限公司 | A kind of plastic pipe flanging device |
| CN106584826A (en) * | 2016-12-27 | 2017-04-26 | 重庆永高塑业发展有限公司 | Plastic pipe flanging mechanism |
| CN106903868B (en) * | 2017-05-03 | 2023-01-31 | 浙江金洲管道科技股份有限公司 | Flange plate lining pipe flanging device |
| CN107175809B (en) * | 2017-07-06 | 2019-05-10 | 温州职业技术学院 | Hot melt plastic expects pipe nozzle automatic flanging former |
| CN111054799A (en) * | 2019-11-12 | 2020-04-24 | 湖南辰州矿业有限责任公司 | Steel-woven composite pipe flanging device |
| CN112138882A (en) * | 2020-06-30 | 2020-12-29 | 中国北方车辆研究所 | Cyclone tube installation tool and installation method |
| CN112848251A (en) * | 2021-01-26 | 2021-05-28 | 宜宾学院 | Pipeline expanded joint assistor |
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| DE3000547A1 (en) * | 1980-01-09 | 1981-07-16 | Rehau Plastiks Ag & Co, 8673 Rehau | Moulding thermoplastic tube end into sharp edged flange - with ring in sliding mechanism forcing heated end into cavity |
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Assignee: Kelamayi Keneng Corrosion Resistant Technology Co., Ltd. Assignor: Beijing University of Chemical Technology Contract fulfillment period: 2009.3.9 to 2014.3.9 contract change Contract record no.: 2009990001308 Denomination of invention: Plastic piping turnup apparatus Granted publication date: 20070502 License type: exclusive license Record date: 2009.12.4 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.3.9 TO 2014.3.9; CHANGE OF CONTRACT Name of requester: KARAMAY CITY KENENG ANTICORROSIVE TECHNOLOGY CO., Effective date: 20091204 |
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