WO2009018721A1 - Équipement et procédé de fabrication de conduite composite acier/plastique - Google Patents

Équipement et procédé de fabrication de conduite composite acier/plastique Download PDF

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Publication number
WO2009018721A1
WO2009018721A1 PCT/CN2008/001438 CN2008001438W WO2009018721A1 WO 2009018721 A1 WO2009018721 A1 WO 2009018721A1 CN 2008001438 W CN2008001438 W CN 2008001438W WO 2009018721 A1 WO2009018721 A1 WO 2009018721A1
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WO
WIPO (PCT)
Prior art keywords
steel
plastic composite
manufacturing
steam
composite pipe
Prior art date
Application number
PCT/CN2008/001438
Other languages
English (en)
French (fr)
Inventor
Mingwei Zhang
Original Assignee
Mingwei Zhang
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mingwei Zhang filed Critical Mingwei Zhang
Priority to NZ583167A priority Critical patent/NZ583167A/xx
Priority to AU2008286151A priority patent/AU2008286151B2/en
Priority to JP2010519325A priority patent/JP5326176B2/ja
Priority to US12/525,737 priority patent/US8146639B2/en
Priority to CA2695459A priority patent/CA2695459C/en
Priority to KR1020097022552A priority patent/KR101220781B1/ko
Priority to EP08783624.3A priority patent/EP2116751B1/en
Publication of WO2009018721A1 publication Critical patent/WO2009018721A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/154—Making multi-wall tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/049—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using steam or damp
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/0065—Heat treatment
    • B29C63/0069—Heat treatment of tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16—Cooling
    • B29C2035/1616—Cooling using liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16—Cooling
    • B29C2035/1691—Cooling using gas-liquid mixtures

Definitions

  • the present invention is in the field of steel-plastic composite pipe manufacturing, and more particularly to an apparatus and method for bonding a plastic liner to an inner wall of a steel pipe.
  • Steel-plastic composite pipe is a new type of building water supply material. Because it can make the inner wall of the pipe corrosion-resistant and the outer steel pipe has high strength, it becomes a substitute for the whole plastic pipe and is recognized by the majority of users. The market is very good.
  • the traditional steel-plastic composite pipe is manufactured by transferring heat to the plastic pipe through electric, oil, gas, natural gas heated steel pipes, and also directly bonding the plastic pipe of the inner liner to the steel pipe by using an adhesive (for example, the publication number is WO2004/011231). Patent literature).
  • the traditional bonding is heated by electricity, oil, gas, natural gas, and converted into hot air to directly heat the pipe, which may cause uneven heating, resulting in poor bonding of the steel pipe or poor local adhesion. After thermal expansion and contraction, it is very It is easy to disengage steel and plastic, and it will lead to uneven steel-plastic end face and shrinkage of plastic pipe, which will not achieve the best quality of steel-plastic pipe.
  • the steel-plastic pipe manufacturing in the prior art belongs to a labor-intensive industry. There is no corresponding numerical control equipment and conveying equipment, and the electromechanical integration is not well realized. Therefore, the labor intensity is large, and the control is large. Low precision and high product reject rate. In particular, it is impossible to solve the difficulties in producing plastic pipes of different sizes and sizes, steel pipes of different wall thicknesses and different plastic materials under different environmental temperatures and different environmental humidity conditions.
  • the object of the present invention is to provide a steel-plastic composite manufacturing equipment and method, which can It is sufficient to overcome the above-mentioned drawbacks in the prior art.
  • High-quality, high-qualification, high-yield steel-plastic composite pipes are produced with low labor intensity.
  • the inventor and applicant of the present invention found in the long-term practice and research that the use of steam as a heating source instead of electricity, oil, gas, natural gas to achieve the combination of the liner and the steel pipe can achieve very good bonding. effect.
  • the steam pressurizes the outer layer of the steel pipe, which is compared with the high frequency and hot air conversion used in the prior art, or the internal pressure of water is not only simple, but also the tube is heated and pressurized uniformly. The effect is excellent. Tests have shown that the steel-plastic composite pipe produced in this way has a markedly improved robustness and a prolonged life.
  • Still another advantage of the present invention is that industrial waste steam can be utilized, which is advantageous for energy saving and reduction, and reduces production costs. Moreover, it will be readily understood by those skilled in the art that it is more economical to use steam heating than other direct heating or pressurization of the tubing by water or by water. Therefore, the invention enables the manufacture of the steel-plastic composite pipe to be combined with the numerical control equipment and the advanced conveying device, realizes the programming control and the man-machine dialogue, reduces the physical labor intensity through the high-tech, improves the production control precision and the product qualification rate, especially according to the pair.
  • the test data and theoretical analysis of the plastic pipe control the temperature and pressure of the steam to be just right, so that the plastic liner is just softened to the extent that it is most favorable for bonding without damaging the material, and the steam pressure reaches the corresponding temperature and plastic lining.
  • the degree of softening of the tube is most suitable for the degree of steel-plastic bonding without destroying the quality of the pipe.
  • Mr. Zhang Mingwei further discovered that when steam-heated bonded steel-plastic composite pipes, steam can be recycled, which not only achieves energy saving and consumption reduction, but also stabilizes heat supply, further improving product quality and yield. Further implementation Energy saving and emission reduction. Mr. Zhang not only discovered these favorable solutions, but also solved the difficulties in realizing these solutions through a large number of experiments. Through the secondary heating of the recovered steam and the real-time multi-point monitoring of the corresponding parameters such as temperature, humidity and pressure, etc. Measures to make the advanced concept of manufacturing steel-plastic composite pipe by circulating steam heating be implemented and perfected, and constitute the basis of the technical solution of the method and equipment for manufacturing steel-plastic composite pipe of the present invention, and realize the manufacture of steel-plastic composite pipe A qualitative leap in technology.
  • the basis of the present invention is a method for manufacturing a steel-plastic composite pipe by steam heating and pressurization, which comprises the following steps:
  • the circuit and the gas path are connected, and the circulating steam is continuously supplied into the steel-plastic composite device and heated and pressurized into the pipe;
  • the process parameters are controlled according to the set process flow, and a complete composite process is completed according to the set process route, including preheating, heating, constant temperature, and voltage regulation; according to the process flow, the steel plastic heat compounding is performed at an appropriate timing.
  • the device is stepped down and unloaded, and the door is taken out from the steel-plastic composite device;
  • the taken pipe is conveyed to a cooling station and cooled and shaped according to a set process flow;
  • the pipe is taken out of the cooling station according to the process.
  • the above-described step of pressurizing the tube can be achieved by adding steam to the tube, which has the advantages of simple process and simple structure. But it is preferred to add air to the tube so that not only The steam consumption is saved, and the temperature difference between the inside and the outside of the plastic tube can be maintained, so that the inner surface of the tube which does not need to be bonded is lower in temperature and softened to a lower degree, so that the damage to the tissue is low.
  • the steel material is preferably conveyed by a conveying device. That is, before the pipe material is placed in a steel-plastic composite heat-dissipating device, the steel pipe pipe that has been inserted into the plastic liner is loaded into a pipe conveying device, and locked, and then the conveying device is sent together into the steel-plastic heat.
  • the composite device in the step of taking out the pipe from the steel-plastic heat-compositing device, the conveying device is taken out together, so that the composite pipe can be batch-processed.
  • the display instrument is used to monitor the steps of completing the complete composite process in accordance with the set process route.
  • the process parameters preferably include steam entry velocity and / or flow and / or time and / or temperature and / or pressure and / or compressed air pressure.
  • the pressure and temperature include not only the pressure and temperature within the composite chamber, but also the pressure and temperature within the tube.
  • the steel pipe size and/or the wall thickness size and/or the manufacturing quantity and/or the cold water type (or the hot water type) are input according to the prompt of the computer display. Enter the ambient temperature and/or ambient humidity during operation; enter the plastic grade or number, glue grade or number.
  • the input of these parameters is preferably carried out in a human-machine dialogue.
  • the multi-function composite studio is automatically tested for various technical parameters, and according to the technical parameters of the process, the technical process parameters (such as steam inlet speed) of the multi-functional composite studio are executed by executing the controller and automatically. , flow, time, temperature, pressure, compressed air pressure, etc.) to adjust the control to make the actual technical parameters Meet the set process technical parameters.
  • control system automatically records and stores various technical parameters and/or technical parameter characteristic curves in the process flow, and has functions of copying, extracting, and retrieving.
  • the cooling and setting step is carried out by water cooling, and the advantage of water cooling is that the cooling rate is fast and the cooling is uniform.
  • a circulating water spray can also be used to wet the water.
  • Gas cooling can also be used, which has the advantages of simple equipment and low cost. It is also possible to use a combination of water and gas cooling, and any combination of the above, and particularly preferably with a secondary recycle of water.
  • the circulating steam is used in the manufacturing process of the steel-plastic composite pipe, and it is particularly preferable to reheat the circulating steam on the circulating steam circuit, so that the process parameters can be kept stable, especially according to the process.
  • the heat supplementation detected in the secondary heating is required to achieve the temperature and pressure required for the steel-plastic composite pipe production again.
  • Steam can also be replenished on the steam circuit, i.e., a new steam source can be provided, which can be produced by a steam generator, or can utilize commercially available pipe industry steam, such as steam from a power plant or steam from a chemical plant.
  • the above secondary heating and supplementary steam may be separately implemented, or may be combined, gp, and the new steam source is sent to the steel-plastic composite device together with the recovered steam heated by the secondary heating device to compensate for the composite production of the steel-plastic pipe.
  • the steam cycle device may further include at least one steam storage device that can receive the recovered steam from the secondary heating furnace and the steam from the new steam source, and then transport the steam in the gas storage device into the steel mold Thermal composite device.
  • the equipment for manufacturing steel-plastic composite pipe which is carried out by Mr.
  • the equipment for manufacturing steel-plastic composite pipe which is carried out by Mr.
  • the equipment for manufacturing steel-plastic composite pipe has a pipe conveying device, a steel-plastic composite device, a steam circulation device, a cooling forming device and a corresponding connecting line.
  • the steel-plastic composite device includes a steam charging device and an in-tube pressurizing device.
  • the in-tube pressurization is preferably carried out by charging air into the tube, or it is also possible to charge the tube with other gases such as steam.
  • control system is further provided to allow the apparatus of the present invention to step out of a labor-intensive industry, thereby producing a high-quality, high-yield, high-yield steel-plastic composite pipe with low labor effort.
  • the pipe conveyor is provided with a multi-purpose (ie pneumatic or hydraulic or electric, etc.) pipe conveyor.
  • a multi-purpose pipe conveyor ie pneumatic or hydraulic or electric, etc.
  • the steel-plastic composite unit has multiple functions (i.e., including direct and indirect methods, direct method refers to direct steam heating, and indirect method refers to steam through heat transfer conversion). This is also to increase the room for operator selection.
  • the steam circulation device is provided with a steam circulation conveying system and a steam secondary heating device and/or a steam replenishing system, which are continuously controlled to the steel by the control of the control system according to the real-time pressure and heat demand in the process steps.
  • the thermal composite device provides reusable heated steam.
  • the cooling forming device preferably adopts a circulating water sprinkling device, and may also adopt a water infiltration or a combination of gas or water gas, including any combination of these devices, and particularly preferably a water recirculation recycling device and a control device.
  • the control system is preferably an automatic control system having a detection device, a display instrument, a data input device and a control device.
  • the control system is preferably a numerical control system.
  • the control system is provided with respective sensors, the sensors comprising at least a sensor disposed within the steel-plastic heat composite device, which detects various real-time parameters for the control system.
  • the sensor is preferably evenly distributed within the steel-plastic thermal composite device, the density of which preferably ensures optimal control of the various parameters in the manufacture of the steel-plastic composite pipe.
  • the multi-function composite studio is automatically tested for various technical parameters, and according to the technical parameters of the process, the technical process parameters (such as steam inlet speed) of the multifunctional composite studio are executed by executing the controller and automatically.
  • the flow rate, time, temperature, pressure, compressed air pressure, etc. are adjusted and controlled so that the actual technical parameters meet the set process technical parameters.
  • control system can automatically record and save various technical parameters and/or technical parameter characteristic curves in the process, and has the functions of copying, extracting and searching.
  • the process parameters that the data input device can input include: steam entry speed and/or flow rate and/or time and/or temperature and/or pressure and/or compressed air pressure.
  • the control device has a temperature controller and/or a pressure controller and/or a gas valve controller and/or a time difference controller.
  • the pipe conveying device also has a locking device for positioning, sealing and locking the steel-plastic pipe on the pipe conveying device.
  • any combination of the above preferred or alternative features and/or aspects is encompassed by the manufacture of the present invention.
  • the overall solution for the method of steel-plastic composite pipe Although it is not necessary to describe in detail one by one, those skilled in the art can easily implement any combination of these features and/or aspects after reading this specification.
  • the technical solution of the present invention however, the technical solution of the present invention constituted by combining these features is not obvious before the present invention is invented. In fact, she is the crystallization of the intensive research and experiment of the inventor Zhang. .
  • the method and device of the present invention make a rapid leap in the steel-plastic composite manufacturing technology, which not only greatly improves the bonding strength of the steel-plastic pipe, but also greatly improves the product qualification rate, greatly reduces the energy consumption, and greatly reduces the labor intensity.
  • it solves the difficulty in producing plastic pipes of different specifications and sizes, steel pipes of different wall thicknesses and different plastic materials under different environmental temperatures and different environmental humidity conditions.
  • Figure 1A is a schematic view showing the structure and flow of a single quick opening door steel-plastic composite pipe manufacturing apparatus as a preferred embodiment of the present invention.
  • Figure 1B shows the tube station, the unloading station, and the cooling station in the apparatus of Figure 1.
  • Fig. 2 is a view showing the structure and flow of a double-fast-opening steel-plastic composite pipe manufacturing apparatus as another preferred embodiment of the present invention.
  • the single-door steel-plastic composite pipe manufacturing apparatus has a steel-plastic composite device 1, which in this embodiment is implemented as a multi-functional composite working chamber.
  • the pipe conveyor 14 is implemented as a multi-purpose pipe conveyor.
  • the automatic locking is achieved by the electric locking machine 10.
  • the drive units 8, 9, 19, 20 feed the multi-function pipe conveyor to the multi-functional composite studio 1.
  • the circuit is connected according to the operating procedure, the air circuit 6, the locking device 7 is electrically or pneumatically closed, or the grapple-type sealing door cover, the device is passed through the intelligent program computer.
  • Control host 3 and display 2 realize man-machine dialogue, obtain prompt information, automatically enter the work program, under the monitoring of display instrument 4, according to the set process route, automatically complete the composite full set of process, such as indoor charging, tube inflation, Preheat, warming, constant temperature, voltage regulation.
  • the steam recovery device 21 depressurizes and unloads
  • the alarm is automatically opened, the driving device is started, and the multi-functional pipe conveying vehicle 14 is sent to the cooling rack 16 station via the moving rails 15, 13 and is time-limited by the cooling forming devices 11, 12, and 17.
  • the cooling water is used for cooling cycle of the pumping cooling tower 22.
  • the electric or pneumatic or hydraulic moving to the unloading station completes a process.
  • Fig. 2 shows another embodiment of the apparatus for manufacturing a steel-plastic composite pipe of the present invention, that is, a double quick-opening type steel-plastic composite pipe manufacturing apparatus.
  • the multi-function pipe transport cart 39 is automatically tightened by the electric locker 34 after the pipe rack 35 is installed.
  • the multi-functional pipe conveyor is fed into the steel-plastic heat composite device (here implemented as a multi-functional composite working chamber) 25 by longitudinal or lateral driving devices 32, 33, 36, 37.
  • the circuit and the gas path 30 are connected according to the operating procedure, and the locking device 31 closes the toothed sealing door cover. Under the monitoring of the display instrument 28, the device is intelligently programmed.
  • the computer controls the host computer 27 and the display 26 to realize the man-machine dialogue.
  • the user After obtaining the prompt information, the user automatically enters the working program, and automatically completes the composite complete process according to the set process route, such as indoor charging, in-tube inflation and pressure, preheating, and warming up. , constant temperature, voltage regulation, after the steam recovery device 38 step-down unloading, automatic alarm to open the door, drive
  • the device is started, and the multi-functional pipe conveyance cart 39 is sent to the cooling rack 41 station via the moving rails 24, 40.
  • the cooling water is cooled and recycled by the pumping cooling tower 22, and is cooled by the cooling forming devices 22, 23, and 42 for a limited time. After the cooling is completed, the cooling pipe is sent to the unloading station to complete a process.
  • the closing of the sealing device 31 by the locking device 31 can be effected by means of a pneumatic device, by means of an electric device, or by a hydraulic device.
  • the feeding and unloading station device may be an electric device, or a pneumatic device or a hydraulic device.
  • the above-mentioned toothed sealing door cover can also be changed to a hook type.
  • the production practice proves that with the steel-plastic composite pipe manufacturing equipment of the invention, the product batch pass rate is increased from 97% of the ordinary equipment to 99.9%, and the production capacity is greatly improved. Compared with the daily shift before the implementation of the plan, the production capacity is increased by 15 °/.
  • the economic value effect is obvious. Due to the secondary recycling of steam, it is calculated according to the daily output of 40 tons of a production line, which consumes 3 B ⁇ of steam and saves energy by about 405 yuan/day, which has obvious economic value. Through the secondary recycling of water, each ton of steel-plastic pipe reduces the water consumption by about 8%, and the economic value is obvious. After the implementation of the program, the labor intensity of the production and operation workers is reduced, and the labor cost is reduced by 5%. The cost per ton of pipe can be reduced by 10 yuan.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Description

制造钢塑复合管材的设备及方法 技术领域
本发明属于钢塑复合管材制造领域，更具体地说，涉及将塑料衬 管结合于钢管内壁的设备和方法。
背景技术
钢塑复合管材是一种新型的建筑给水材料，由于其可以使管材内 壁耐腐蚀且外层钢管强度高，所以成为全塑管的替代品，被广大用户 所认可，市场上销路很好。传统的钢塑复合管材有通过电、油、煤气、 天然气加热钢管传递热量至塑管来制造的，也有直接利用黏合剂将内 衬的塑料管黏结于钢管内的 （例如公开号为 WO2004/011231的专利 文献)。 传统的黏结通过电、 油、 煤气、 天然气制热， 并转换成热风 对管材直接加热，其会出现加热不均匀， 导致钢管粘结不牢或局部粘 结不好， 经热胀冷缩后很容易钢塑脱离， 而且会导致钢塑端面不平， 塑管内缩， 造成钢塑管的质量不能达到最佳品质。
无论采用何种方法，现有技术中的钢塑管材制造都属于一种劳动 密集型产业，没有配套相应的数控设备和输送设备，没有很好地实现 机电一体化， 因此， 劳动强度大， 控制精度低， 产品次品率高。 尤其 是不能解决在不同环境温度、不同环境湿度条件下，生产不同规格尺 寸钢管、 不同壁厚尺寸钢管、 不同塑料材料的塑料管的难点。
发明内容
本发明的目的就是要提供一种钢塑热复合制造设备和方法，其能 够克服上述现有技术中的缺陷。以较低的劳动强度制造出高质量、高 合格率、 高产量的钢塑复合管。
本发明的发明人和申请人章明伟先生在长期的实践和研究中发 现， 以蒸汽为加热源代替电、油、煤气、天然气产热来实现衬管与钢 管的结合， 可以达到非常好的粘结效果。首先， 蒸汽对钢管外层加压 加热，这与现有技术中采用的高频和热风转换，或在内部以水加压相 比， 不仅工艺简便， 而且使管材受热和受压都均匀， 因此效果极佳。 试验显示， 以这种方式制造出来的钢塑复合管材牢固性明显提高，寿 命大大延长。
本发明的再一个优点是可以利用工业废弃的蒸汽，有利于节能减 排， 降低生产成本。此外， 本领域技术人员很容易理解， 采用蒸汽加 热比现有技术中其它直接对管材加热或通过水来加热和加压更经济 实用。所以，本发明使得钢塑复合管材的制造可以结合数控设备和先 进的输送装置，实现编程控制和人机对话，通过高科技降低体力劳动 强度，提高生产控制精度和产品合格率，特别是根据对塑料管材的试 验数据和理论分析，将蒸汽的温度和压力控制得恰如其分，使得塑料 衬管刚好软化到最有利于粘结而又不破坏其材质的程度，并使蒸汽压 力达到相应温度和塑料衬管的软化程度下最适合钢塑粘结而又不破 坏管材质量的程度。
此外，章明伟先生还进一步发现， 以蒸汽加热粘结钢塑复合管材 时， 蒸汽可以循环利用， 这样不仅迸一步实现了节能降耗， 而且使得 热量供应稳定，进一步提高了产品质量和合格率， 同时也进一步实现 了节能减排。章先生不仅发现了这些有利的方案，还通过大量实验从 技术上彻底解决了实现这些方案的难点，通过回收蒸汽的二次加热以 及温度、湿度、压力等相应参数的实时多点监控等一系列措施， 使得 利用循环蒸汽加热来制造钢塑复合管材这一先进的构思得以实施和 完善，并构成本发明的制造钢塑复合管材的方法和设备的技术方案的 基础， 实现了钢塑复合管材制造技术的一次质的飞跃。
本发明的基础是一种利用蒸汽加热加压来制造钢塑热复合管材 的方法， 其包括如下步骤：
对已经套入塑料衬管的钢管进行气密试验；
将试验合格的管材送入一钢塑热复合装置，并将该钢塑热复合装 置的门盖密封锁紧；
按照工艺流程规定接通电路和气路，向钢塑热复合装置内连续地 供入循环蒸汽并向管材内加温加压；
通过控制系统， 按照设定的工艺流程控制工艺参数，并按照设定 工艺路线完成全套复合工艺过程， 包括预热、 升温、 恒温、 稳压； 按照工艺流程，在适当的时机使钢塑热复合装置降压卸荷， 开门 将管材从钢塑热复合装置内取出；
将取出的管材输送到冷却工位，按照设定的工艺流程进行冷却定 型；
按照工艺流程将管材从冷却工位取出。
上述向管内加压步骤可以通过向管内加入蒸汽实现，这样实施的 优点是工艺简单、结构简单。但优选的是向管内加入空气， 这样不仅 节省了蒸汽消耗，而且可以使塑料管内外保持温差，使得不需要粘结 的管内表面温度较低， 软化程度较低， 从而对其组织损坏较低。
在所述制造方法中， 优选利用一输送装置输送所述钢材。 即， 在 上述将管材放入一钢塑热复合装置前，将已经套入塑料衬管的钢管管 材装入一管材输送装置， 并将其锁紧，然后将此输送装置一同送入钢 塑热复合装置；在所述将管材从钢塑热复合装置内取出步骤中，将输 送装置一同取出， 这样便可批量处理所述复合管材。
优选用显示仪表监控上述按设定工艺路线完成全套复合工艺过 程的步骤。
在蒸汽工作室降压卸荷后，优选报警后再开启钢塑热复合装置的 门盖。
所述工艺参数优选包括蒸汽进入速度和 /或流量和 /或时间和 /或 温度和 /或压力和 /或压缩空气压力。 优选的是， 所述压力和温度不仅 包括复合室内的压力和温度， 而且包括管内的压力和温度。
优选的是， 在所述按照设定的工艺流程控制工艺参数的步骤中， 根据电脑显示器提示输入钢管规格尺寸和 /或壁厚尺寸和 /或制造数量 和 /或冷水型（或热水型）； 并输入操作时环境温度和 /或环境湿度； 输 入塑料牌号或编号、胶水牌号或编号。这些参数的输入优选采用人机 对话的方式进行。在整个工艺流程中， 自动对多功能复合工作室进行 各项技术参数检测， 并依据工艺设定技术参数， 通过执行控制器、 自 动对多功能复合工作室的技术工艺参数（如蒸气进气速度、流量、 时 间、温度、压力、压缩空气压力等）进行调整控制， 使实际技术参数 符合设定工艺技术参数。
优选的是，所述控制系统自动记录并保存工艺流程中各项技术参 数和 /或技术参数特性曲线， 并具备复制、 提取、 检索功能。
优选的是，所述冷却定型步骤采用水冷进行，水冷的优点是冷却 速度快、冷却均匀。例如， 采用循环式水喷淋， 也可以釆用水浸润的 方式。
也可以采用气体冷却， 其优点是设备简单、成本低。还可以采用 水气组合的冷却方式， 以及上述方式的任意组合，特别优选带有水二 次循环回收。
优选的是， 在上述钢塑复合管材的制造工艺中采用循环供给蒸 汽，特别优选的是，在循环供给蒸汽回路上对循环蒸汽进行二次加热， 这样可以使工艺参数保持稳定，特别是根据流程中检测到的热量补充 需求进行二次加热，使其达到再次进行钢塑复合管生产所需的温度和 压力。还可以在蒸汽循环回路上补充蒸汽，即，设置一个新的蒸汽源， 该蒸汽源可以由蒸汽发生器产生， 也可以利用市售的管道工业蒸汽， 例如电厂的蒸汽或化工厂的蒸汽。上述二次加热和补充蒸汽可以单独 实施， 也可以结合实施， gp， 将新的蒸汽源与经过二次加热装置加热 的回收蒸汽一同送入钢塑热复合装置，以弥补钢塑管道复合生产中蒸 汽的损耗。蒸汽循环装置还可以包括至少一个储汽装置，该储汽装置 可以接收来自二次加热炉加热后的回收蒸汽和来自新的蒸汽源的蒸 汽， 然后再将储气装置中的蒸汽输送入钢塑热复合装置。
基于上述制造钢塑复合管材的方法，本发明的另一个主题是章明 伟先生所研究的实施上述方法的制造钢塑复合管材的设备，作为该设 备的基本方案， 其具有管材输送装置、钢塑热复合装置、蒸汽循环装 置、冷却成型装置以及相应的联接管线。钢塑热复合装置包括蒸汽充 入装置和管内加压装置。管内加压优选通过向管内充入空气实施，也 可以向管内充入其他气体， 例如蒸汽。
优选还具有控制系统， 以使本发明的设备走出劳动密集型产业， 从而以较低的劳动付出制造出高质量、高成品率、高产量的钢塑复合 管材。
优选的是， 管材输送装置配有多功能（即气动或液压或电动等） 管材输送车。 这样输送车输送选择的余地大。
优选的是， 钢塑热复合装置具有多功能（即， 包括直接法和间接 法， 直接法指蒸汽直接加热， 而间接法指蒸汽通过散热转换加热）复 合工作室。 这样也是为了使操作者选择的余地增大。
优选的是，蒸汽循环装置中带有蒸汽循环输送系统和蒸汽二次加 热装置和 /或蒸汽补充系统， 其通过控制系统的控制， 按照工艺步骤 中的实时压力和热量需求，连续地向钢塑热复合装置提供可重复使用 的加热蒸汽。
所述冷却成型装置优选采用循环式水喷淋装置，也可以采用水浸 润或气体或水气组合的冷却装置，包括这些装置的任意组合，特别优 选带有水二次循环回收使用装置和控制设备
所述控制系统优选为自动控制系统，其具有检测设备、显示仪表、 数据输入设备和控制设备。 所述控制系统优选为数控系统。
优选为控制系统配置相应的传感器，这些传感器至少包括设置在 钢塑热复合装置内的传感器，其为控制系统检测各项实时参数。所述 传感器优选均匀分布在钢塑热复合装置内，其密度优选能够保证在钢 塑复合管材的制造中对各项参数实施最佳控制。在整个工艺流程中自 动对多功能复合工作室进行各项技术参数检测，并依据工艺设定技术 参数，通过执行控制器、自动对多功能复合工作室的技术工艺参数 (如 蒸气进气速度、 流量、 时间、温度、压力、 压縮空气压力等）进行调 整控制， 使实际技术参数符合设定工艺技术参数。
所述控制系统优选能自动记录并保存流程中各项技术参数和 /或 技术参数特性曲线， 并具备复制、 提取、 检索功能。
所述数据输入设备可输入的工艺参数包括： 蒸汽进入速度和 /或 流量和 /或时间和 /或温度和 /或压力和 /或压縮空气压力。
所述控制设备具有温度控制器和 /或压力控制器和 /或气阀门控制 器和 /或时差控制器。
所述的管材输送装置还带有锁紧装置，用于对管材输送装置上的 钢塑管定位、 密封和锁紧。
无论对于本发明的制造钢塑复合管材的方法的主题，还是对于本 发明的制造钢塑复合管材的设备的主题， 上述各优选或替代特征和 / 或方案的任意组合都包含在本发明的制造钢塑复合管材的方法的总 体方案之内。虽然不必一一详细描述，本领域的普通技术人员在阅读 本说明书之后即可很容易地实现由这些特征和 /或方案的任意组合而 构成的技术方案， 然而， 在本发明没有问世前， 由这些特征结合在一 起而构成的本发明的技术方案并不是显而易见的，事实上，她是发明 人章先生多年来潜心研究和试验的结晶。
综上所述，本发明的方法和装置使钢塑热复合制造技术得到一个 飞跃， 不仅大大改善了钢塑管结合强度， 而且产品合格率大大提高， 能耗大大减低，劳动强度也大大降低,尤其是解决了在不同环境温度、 不同环境湿度条件下， 生产不同规格尺寸钢管、 不同壁厚尺寸钢管、 不同塑料材料的塑料管的难点。
附图说明
图 1A为作为本发明的一优选实施例的单快开门钢塑复合管材制 造设备的结构和流程示意图。
图 1B示出了图 1所示的设备中的装管工位、 卸管工位和冷却工 位。
图 2 为作为本发明的另一优选实施例的双快开门钢塑复合管材 制造设备的结构和流程示意图。
具体实施方式
为了使本发明更形象，理解起来更容易，下面结合附图描述本发 明的制造钢塑复合管材的设备的两个优选实施例。
如图 1所示， 单开门钢塑复合管材制造设备具有钢塑热复合装 置 1， 在本实施例中， 其实施为一多功能复合工作室。 而管材输送装 置 14实施为一多功能管材输送车。在装管架 18经装管后，经过电动 锁紧机 10实现自动顶锁紧。 经气密性试验合格后， 通过纵向或横向 驱动装置 8、 9、 19、 20把多功能管材输送车送入多功能复合工作室 1。 在多功能管材输送车完全进入多功能复合工作室后， 按操作规程 连接电路、 气路 6， 锁紧装置 7电动或气动关闭齿啮式或者抓钩式密 封门盖， 设备通过智能程序化电脑控制主机 3和显示器 2， 实现人机 对话， 获取提示信息后， 自动进入工作程序， 在显示仪表 4监控下， 按设定工艺路线， 自动完成复合全套工艺过程， 如室内充汽、管内充 气、 预热、 升温、 恒温、 稳压。 经蒸汽回收装置 21降压卸荷后自动 报警开门， 驱动装置启动， 将多功能管材输送车 14经移动轨道 15、 13送入冷却架 16工位， 由冷却成型装置 11、 12、 17限时定型冷却， 冷却水经泵送冷却塔 22冷却循环使用， 定型冷却结束后电动或气动 或液动送入卸管工位完成一个工艺过程。
图 2示出了本发明的制造钢塑复合管材的设备的另一实施例， 即， 双快开门式钢塑复合管材制造设备。如图 2所示， 多功能管材输 送车 39在装管架 35装管后由电动锁紧机 34自动顶紧。 经气密性试 验合格后， 通过纵向或横向驱动装置 32、 33、 36、 37把多功能管材 输送车送入钢塑热复合装置 (在此实施为一多功能复合工作室 )25。 在 多功能管材输送车完全进入多功能复合工作室后，按操作规程连接电 路、 气路 30， 锁紧装置 31关闭齿啮式密封门盖， 在显示仪表 28的 监控下， 设备通过智能程序化电脑控制主机 27和显示器 26， 实现人 机对话， 获取提示信息后， 自动进入工作程序， 按设定工艺路线， 自 动完成复合全套工艺过程，如室内充汽、管内充气加压、预热、升温、 恒温、 稳压， 经蒸汽回收装置 38降压卸荷后， 自动报警开门， 驱动 装置启动， 将多功能管材输送车 39经移动轨道 24、 40送入冷却架 41工位。冷却水经泵送冷却塔 22冷却循环使用，由冷却成型装置 22、 23、 42 限时定型冷却， 定型冷却结束后送入卸管工位完成一个工艺 过程。
上述锁紧装置 31关闭密封门盖可以通过气动装置实现， 也可通 过电动装置实现， 或者通过液动装置实现。
上述定型冷却结束后送入卸管工位装置可以为一电动装置，也可 以为一气动装置， 或者一液动装置。
上述齿啮式密封门盖也可以改为抓钩式。
生产实践证明，采用本发明的钢塑复合管材制造设备，产品批次 合格率从普通设备的 97%提高到 99.9%， 生产能力得到较大提高，与 方案实施前日班量比较， 生产产能提高 15°/。， 经济价值效果明显。 由 于蒸汽的二次循环回收利用， 按一条生产线日产量 40吨计算， 耗用 蒸汽 3 B屯， 节省能源约 405元 /日， 具有明显的经济价值。 通过水的 二次循环回收利用， 每生产一吨钢塑管降低水资源消耗 8%左右， 经 济价值明显。方案实施后， 生产操作工人的劳动强度减轻， 工费降低 5 %。 每吨管材成本可降低 10元。

Claims

权 利 要 求 书
1. 一种钢塑复合管材的制造设备， 其包括含有多功能复合工作 室的钢塑热复合装置、带有多功能管材输送车的管材输送装置、蒸汽 循环装置、冷却成型装置， 其特征在于： 所述的钢塑热复合装置具有 连续供给可供重复使用蒸汽的蒸汽循环装置和控制设备。
2.如权利要求 1所述的设备， 其特征在于： 所述蒸汽循环装置带 有蒸汽二次加热装置。
3.如权利要求 1所述的设备， 其特征在于： 所述蒸汽循环装置带 有蒸汽补充装置。
4.如权利要求 2所述的设备， 其特征在于： 所述蒸汽循环装置带 有蒸汽补充装置。
5.如权利要求 1所述的钢塑复合管的制造设备， 其特征在于- 所述的钢塑热复合装置设有一个或两个材料进出口，材料进出口的位 置在钢塑复合装置的一侧或二侧或中间。
6.如权利要求 1所述的钢塑复合管的制造设备， 其特征在于： 所述冷却成型装置为一种循环式水喷淋冷却装置。
7.如权利要求 1所述的钢塑复合管的制造设备， 其特征在于： 所述冷却成型装置为水浸润冷却装置。
8.如权利要求 1所述的钢塑复合管的制造设备， 其特征在于： 所述冷却成型装置为气体冷却装置。
9.如权利要求 1所述的钢塑复合管的制造设备， 其特征在于： 所述冷却成型装置为水气组合冷却装置。
10.如权利要求 6、 7、 9所述的钢塑复合管的制造设备， 其特征 在于： 具有冷却水二次循环回收使用装置。
11.如权利要求 1-3中任一项所述的钢塑复合管的制造设备， 其 特征在于：其还安装有自动控制系统，该自动控制系统具有检测设备、 显示设备、 输入设备和控制系统。
12.如权利要求 11所述的钢塑复合管材的制造设备， 其特征在 于：输入设备可输入包括蒸汽进入速度和 /或流量和 /或时间和 /或温度 和 /或压力和 /或压缩空气压力在内的工艺参数。
13.如权利要求 11所述的钢塑复合管材的制造设备， 其特征在 于：控制设备包括温度控制器和 /或压力控制器和 /或气阀门控制器和 / 或汽阀门控制器和 /或时差控制器。
14.如上述权利要求中任一项所述的钢塑复合管的制造设备， 其 特征在于：所述管材输送装置还设有锁紧装置，其可以实现对管材输 送装置上的钢塑管定位、 密封和锁紧。
15.一种钢塑复合管的制造方法， 其特征在于： 其由权利要求 1 一 7中任何一项的复合管材的制造设备制造。
16.一种钢塑复合管的制造方法， 其包括如下步骤：
对已经套入塑料衬管的钢管进行气密试验；
将试验合格的管材送入一钢塑热复合装置，并将该钢塑热复合装 置的门盖密封锁紧；
按照工艺流程规定接通电路和气路，向钢塑热复合装置内连续地 供入循环蒸汽并向管材内加压； 通过控制系统， 按照设定的工艺流程控制工艺参数， 并按照设定 工艺路线完成全套复合工艺过程， 包括预热、 升温、 恒温、 稳压； 按照工艺流程，在适当的时机使钢塑热复合装置降压卸荷，开门 将管材从钢塑热复合装置内取出；
将取出的管材输送到冷却工位，按照设定的工艺流程进行冷却定 型；
按照工艺流程将管材从冷却工位取出。
17.如权利要求 16所述的钢塑复合管的制造方法， 其特征在于： 在循环供给蒸汽回路上对循环蒸汽进行二次加热。
18. 如权利要求 16所述的钢塑复合管的制造方法， 其特征在于： 在蒸汽循环回路上补充蒸汽。
19. 如权利要求 17所述的钢塑复合管的制造方法， 其特征在于： 在蒸汽循环回路上补充蒸汽。
20.如权利要求 19所述的钢塑复合管的制造方法， 其特征在于： 包括至少一个储汽装置，该储汽装置可以接收来自二次加热炉加热后 的回收蒸汽和来自新的蒸汽源的蒸汽，然后再将储气装置中的蒸汽输 送入钢塑热复合装置。
21.如权利要求 20所述的钢塑复合管的制造方法， 其特征在于： 管内加压步骤可以通过向管内加入蒸汽实现。
22.如权利要求 21所述的钢塑复合管的制造方法， 其特征在于： 管内加压步骤可以通过向管内加入空气实现。
23.如权利要求 15-22所述的钢塑复合管的制造方法， 其特征在 于- 在整个流程中采用一输送装置输送所述管材。
24.如权利要求 15-23所述的钢塑复合管的制造方法， 其特征在 于：通过显示仪表监控上述按设定工艺路线完成全套复合工艺过程的
25.如权利要求 15-24所述的钢塑复合管的制造方法， 其特征在 于：在热复合工作室降压卸荷后，报警后再开启钢塑热复合装置的门
26.如权利要求 15-25所述的钢塑复合管的制造方法， 其特征在 于：工艺参数包括蒸汽进入速度和 /或流量和 /或时间和 /或温度和 /或压 力和 /或压缩空气压力。
27.如权利要求 26所述的钢塑复合管的制造方法， 其特征在于: 所述压力和温度不仅包括复合装置内的压力和温度，而且包括管内的 压力和温度。
28.如权利要求 15-27中任一项所述的钢塑复合管的制造方法， 其特征在于：在所述按照设定的工艺流程控制工艺参数的步骤中，根 据电脑显示器提示输入钢管规格尺寸和 /或壁厚尺寸和 /或制造数量和 /或冷水型（或热水型），并输入操作时环境温度和 /或环境湿度以及塑 料牌号或编号、 胶水牌号或编号。
29.如权利要求 15-28中任一项所述的钢塑复合管的制造方法， 其特征在于：在整个工艺流程中， 自动对多功能复合工作室进行各项 技术参数检测， 并依据工艺设定技术参数， 通过执行控制器、 自动对 多功能复合工作室的技术工艺参数进行调整控制，使实际技术参数符 合设定工艺技术参数。
30.如权利要求 29所述的钢塑复合管的制造方法， 其特征在于： 所述技术工艺参数包括蒸气进气速度、 流量、 时间、温度、 压力、压 缩空气压力。
31.如权利要求 15-30中任一项所述的钢塑复合管的制造方法， 其特征在于：所述控制系统自动记录并保存工艺流程中各项技术参数 和 /或技术参数特性曲线， 并具备复制、 提取、 捡索功能。
32.如权利要求 15-31中任一项所述的钢塑复合管的制造方法， 其特征在于： 所述冷却定型步骤采用水冷。
33. 如权利要求 32所述的钢塑复合管的制造方法， 其特征在于- 采用循环式水喷淋实现所述水冷。
34.如权利要求 31所述的钢塑复合管的制造方法， 其特征在于: 采用气体冷却实现所述冷却定型步骤。
35.如权利要求 31所述的钢塑复合管的制造方法， 其特征在于: 采用水气组合的冷却方式。
36.如权利要求 32、 33、 35所述的钢塑复合管的制造方法， 其 特征在于： 包括冷却水二次循环回收步骤。
PCT/CN2008/001438 2007-08-09 2008-08-07 Équipement et procédé de fabrication de conduite composite acier/plastique WO2009018721A1 (fr)

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NZ583167A NZ583167A (en) 2007-08-09 2008-08-07 Equipment and method for manufacturing steel-plastic composite pipe using reuseable steam
AU2008286151A AU2008286151B2 (en) 2007-08-09 2008-08-07 Equipment and method for manufacturing steel-plastic composite pipe
JP2010519325A JP5326176B2 (ja) 2007-08-09 2008-08-07 鋼樹脂複合管の製造設備およびその製造方法
US12/525,737 US8146639B2 (en) 2007-08-09 2008-08-07 Equipment and method for manufacturing steel-plastic composite pipe
CA2695459A CA2695459C (en) 2007-08-09 2008-08-07 Equipment and method for manufacturing steel-plastic composite pipe
KR1020097022552A KR101220781B1 (ko) 2007-08-09 2008-08-07 강-플라스틱 합성 파이프를 제조하는 장치 및 방법
EP08783624.3A EP2116751B1 (en) 2007-08-09 2008-08-07 Apparatus for manufacturing steel-plastic composite pipe

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CNA2007101405236A CN101303096A (zh) 2007-08-09 2007-08-09 钢塑复合管材制造设备及钢塑复合管材的制造方法

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CA2695459A1 (en) 2009-02-12
EP2116751A4 (en) 2013-05-01
CA2695459C (en) 2017-12-12
US8146639B2 (en) 2012-04-03
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KR101220781B1 (ko) 2013-01-09
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AU2008286151A1 (en) 2009-02-12

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