CN114012966A - Method for foaming heat-insulating layer of polyurethane foaming heat-insulating pipe - Google Patents
Method for foaming heat-insulating layer of polyurethane foaming heat-insulating pipe Download PDFInfo
- Publication number
- CN114012966A CN114012966A CN202111273668.XA CN202111273668A CN114012966A CN 114012966 A CN114012966 A CN 114012966A CN 202111273668 A CN202111273668 A CN 202111273668A CN 114012966 A CN114012966 A CN 114012966A
- Authority
- CN
- China
- Prior art keywords
- foaming
- pipe
- heat
- polyurethane
- injection
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 238000005187 foaming Methods 0.000 title claims abstract description 140
- 238000000034 method Methods 0.000 title claims abstract description 42
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 39
- 239000004814 polyurethane Substances 0.000 title claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 83
- 238000002347 injection Methods 0.000 claims abstract description 67
- 239000007924 injection Substances 0.000 claims abstract description 67
- 229920005830 Polyurethane Foam Polymers 0.000 claims abstract description 26
- 239000011496 polyurethane foam Substances 0.000 claims abstract description 26
- 238000005086 pumping Methods 0.000 claims abstract description 26
- 238000009413 insulation Methods 0.000 claims description 49
- 238000004140 cleaning Methods 0.000 claims description 20
- 238000007599 discharging Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000003860 storage Methods 0.000 description 13
- 239000004721 Polyphenylene oxide Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 229920000570 polyether Polymers 0.000 description 6
- 229920001228 polyisocyanate Polymers 0.000 description 6
- 239000005056 polyisocyanate Substances 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/18—Filling preformed cavities
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3442—Mixing, kneading or conveying the foamable material
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
Abstract
The invention belongs to the field of manufacturing of polyurethane foaming heat-insulating pipes, and particularly relates to a foaming method of a heat-insulating layer of a polyurethane foaming heat-insulating pipe. The foaming method of the heat-insulating layer of the polyurethane foaming heat-insulating pipe comprises the following steps: introducing compressed gas into a material injection pipe, wherein the material injection pipe is used for injecting foaming materials into an inter-pipe annulus between an inner pipe and an outer pipe of a polyurethane foaming heat-insulating pipe; pumping two foaming components required by polyurethane foaming into the material injection pipe, and pushing the foaming material into an inter-pipe annulus by virtue of compressed gas. The invention can solve the problems that the heat-insulating layer is easy to have cavities and the working efficiency is low when the polyurethane foam heat-insulating pipe is manufactured in the prior art.
Description
Technical Field
The invention belongs to the field of manufacturing of polyurethane foaming heat-insulating pipes, and particularly relates to a foaming method of a heat-insulating layer of a polyurethane foaming heat-insulating pipe.
Background
Since the advent of polyurethane synthetic materials in the thirty years, polyurethane foam heat-insulating pipes have been rapidly developed as excellent heat-insulating materials, and their application range is becoming wider and wider, and because of their simple construction and remarkable energy-saving, corrosion-resistant and heat-insulating effects, they are widely used in various pipelines for heating, refrigeration, oil and gas transportation. Compared with other types of pipes for conveying flowing media, the polyurethane rigid foam plastic direct-buried heat-insulating pipe has the characteristics of low manufacturing cost in the using process, can realize low heat loss, can realize the purpose of saving energy, has good insulativity and long service life, and can replace a trench laying mode and an overhead laying mode. The existing polyurethane foaming heat insulation pipe, such as a direct burial heat supply pipe, generally comprises an inner pipe, a heat insulation layer and an outer pipe, wherein the inner pipe is a steel pipe, the outer pipe is a polyethylene pipe, and the heat insulation layer is formed by polyurethane foaming.
At present, when a polyurethane foaming thermal insulation pipe is manufactured, an inner pipe and an outer pipe are coaxially fixed, a plug is arranged between the end part of the inner pipe and the end part of the outer pipe, then a spray gun rod is inserted into an inter-pipe annulus between the inner pipe and the outer pipe (namely an annular space between the inner pipe and the outer pipe) from an opening on the plug, and two components of polyisocyanate and combined polyether are instantly mixed by a foaming device and are injected into the inter-pipe annulus through a spray gun. The existing foaming device for the thermal insulation pipe is, for example, a foaming system used in the production of a polyurethane foam thermal insulation pipe disclosed in chinese patent document CN203485360U, and includes a first feed pump and a second feed pump, which are respectively used for pumping two foaming components (generally, polyisocyanate and polyether composition) required for polyurethane foaming, outlet ends of the first feed pump and the second feed pump are connected to an injection pipe, and the injection pipe is used for injecting a foaming material into an inter-pipe annulus between an inner pipe and an outer pipe of the polyurethane foam thermal insulation pipe.
In the injection process, the inner pipe and the outer pipe are coaxially fixed and obliquely arranged, and an operator inserts the spray gun into the annular space between the pipes from the opening at the higher end of the polyurethane foaming heat-insulating pipe to control the spray gun to back up and complete material injection and foaming. However, due to the influence of the skill level of manual operation, the heat-insulating layer formed by the existing foaming mode is easy to have the problems of uneven material injection, cavity, long material injection time, low efficiency (taking a single heat-insulating pipe with diameter of 219mm and 10 m/pipe as an example, the time for using a single heat-insulating pipe needs 5-6 minutes), and high labor intensity.
Disclosure of Invention
The invention aims to provide a foaming method for a heat-insulating layer of a polyurethane foaming heat-insulating pipe, which solves the problems that cavities are easy to appear in the heat-insulating layer and the operation efficiency is low when the polyurethane foaming heat-insulating pipe is manufactured in the prior art.
The invention adopts the following technical scheme:
the foaming method of the heat-insulating layer of the polyurethane foaming heat-insulating pipe comprises the following steps:
introducing compressed gas into a material injection pipe, wherein the material injection pipe is used for injecting foaming materials into an inter-pipe annulus between an inner pipe and an outer pipe of a polyurethane foaming heat-insulating pipe;
pumping two foaming components required by polyurethane foaming into the material injection pipe, and pushing the foaming material into an inter-pipe annulus by virtue of compressed gas.
Has the advantages that: adopt above-mentioned technical scheme, during the foaming, to annotating in the material pipe let in compressed gas can with foaming material propelling movement to the intraductal annular space between the pipe rapidly, compare and rely on foaming material to flow by oneself among the prior art, can make foaming material distribute more evenly, be favorable to avoiding appearing the cavity to can realize higher operating efficiency.
Further: before two foaming components required by polyurethane foaming are mixed, compressed gas is introduced into the conveying channels of the two foaming components, so that the two foaming components are uniformly mixed.
Has the advantages that: by adopting the technical scheme, the compressed gas can firstly drive the two foaming components to disperse and quickly converge, so that a good mixing effect can be realized, and the foaming quality can be ensured.
Further: compressed gas is injected through a manifold joint, the manifold joint comprises a first feeding end connected with a first feeding pump, a second feeding end connected with a second feeding pump and a discharging end connected with a material injection pipe, the first feeding end and the second feeding end are respectively provided with a gas injection joint, and the compressed gas is injected through the gas injection joints.
Has the advantages that: by adopting the technical scheme, the compressed gas can be conveniently introduced.
Further: the first feeding end and the second feeding end are arranged symmetrically relative to the discharging end.
Has the advantages that: by adopting the technical scheme, the two foaming components introduced into the first feeding end and the second feeding end can flow in the same state, so that the stability of material flow is ensured.
Further: the first feed end, the second feed end and the discharge end are arranged in a Y-shaped configuration.
Has the advantages that: by adopting the technical scheme, two foaming components can be guided by the inclined first feeding end and the inclined second feeding end, so that the foaming components can smoothly enter the material injection pipe.
Further: the heat preservation layer foaming method further comprises a step of cleaning the material injection pipe, and during cleaning, cleaning media are introduced into the manifold joint through a cleaning port in the pipe manifold joint, which is arranged in line with the material discharge end, so that the manifold joint and the material injection pipe are cleaned.
Has the advantages that: adopt above-mentioned technical scheme can realize avoiding inside the jam to the washing of manifold joint and notes material pipe.
Further: before cleaning, the pumping valves connected at the first feeding end and the second feeding end are closed.
Has the advantages that: by adopting the technical scheme, the influence on the two foaming components during medium cleaning can be avoided.
Further: when injecting into expanded material, the inner tube and the outer tube of polyurethane foaming insulating tube are placed along the horizontal direction, with the both ends shutoff of intraductal annular space, inject expanded material into intraductal annular space from the length direction centre of outer tube.
Has the advantages that: by adopting the technical scheme, the foaming material injected into the annulus between the pipes can flow to both sides of the axial direction of the pipe body simultaneously, so that the injection efficiency is improved, the consistency of foaming conditions at both sides can be ensured, and the product quality is improved.
Further: and controlling the pumping time according to the injection quantity requirement of the foaming material of the single heat-insulating pipe and the pumping speed of the two foaming components, and stopping injecting the foaming material when the set pumping time is reached.
Has the advantages that: by adopting the technical scheme, the using amount of the foaming material can be accurately controlled, quantitative feeding is realized, and waste of raw materials can be avoided.
Further: the injection tube is configured to contain a section of transparent tube.
Has the advantages that: by adopting the technical scheme, the state of the foaming component in the material injection pipe can be observed conveniently.
Drawings
FIG. 1 is a schematic structural view of an apparatus for foaming an insulation layer of a polyurethane foam insulation pipe according to example 1 of a method for foaming an insulation layer of a polyurethane foam insulation pipe according to the present invention;
fig. 2 is a schematic structural view of a manifold joint.
The names of the components corresponding to the corresponding reference numerals in the drawings are: 11. a first material storage tank; 12. a second material storage tank; 13. a filter screen; 21. a first feed pump; 22. a second feed pump; 23. a material suction pipeline; 24. a material suction valve; 25. a pumping line; 26. a pumping valve; 27. a motor; 31. a manifold joint; 32. a material injection pipe; 33. a first feed end; 34. a second feed end; 35. a discharge end; 36. a gas injection joint; 37. a transparent tube section; 38. a galvanized steel pipe; 39. cleaning the port; 41. a gas storage tank; 42. a gas supply line; 43. an air supply valve; 51. an operation table; 52. the motor turns on the button; 53. a motor off button; 54. a material stopping control device; 55. a timing device; 56. a start timing button; 57. an end timing button; 61. positioning a workbench; 62. a steel pipe; 63. connecting a rib plate; 64. an end plug; 71. an outer tube; 72. an inner tube; 73. a heat-insulating layer; 74. drilling; 75. and supporting the wood blocks.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is to be noted that, in the embodiments of the present invention, relational terms such as "first" and "second", and the like, which may be present in the terms of the first and second, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, terms such as "comprises," "comprising," or any other variation thereof, which may be present, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the appearances of the phrase "comprising an … …" or similar limitation may be present without necessarily excluding the presence of additional identical elements in the process, method, article, or apparatus that comprises the same elements.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
In the description of the present invention, unless otherwise specifically stated or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be detachable or non-detachable. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
The present invention will be described in further detail with reference to examples.
Example 1 of the method for foaming the insulation layer of the polyurethane foam insulation pipe of the present invention:
the method for foaming the heat-insulating layer of the polyurethane foam heat-insulating pipe in the embodiment is used for foaming and molding the heat-insulating layer 73 of the polyurethane foam heat-insulating pipe for heating in the oil field, and foaming materials are injected into the inter-pipe annulus between the inner pipe 72 and the outer pipe 71 of the polyurethane foam heat-insulating pipe. In this embodiment, the outer diameter of the polyurethane foam thermal insulation pipe is phi 219mm, and the material of the thermal insulation layer 73 is polyisocyanate and polyether composition. The inner pipe 72 may be a steel or corrosion resistant pipe and the outer pipe 71 is a polyethylene protective pipe.
The method for foaming the heat-insulating layer of the polyurethane foaming heat-insulating pipe adopts a heat-insulating layer foaming device of the polyurethane foaming heat-insulating pipe as shown in figures 1 and 2, wherein the heat-insulating layer foaming device comprises six subsystems, namely a material storage system, a foaming component feeding system, an injection system, an air source supply system, a control system and a foaming platform system. The six parts are mutually associated and work coordinately to jointly complete the inter-pipe annulus material injection of the polyurethane foaming thermal insulation pipe.
Specifically, the storage system comprises a first storage tank 11 and a second storage tank 12, which are used for storing polyisocyanate and polyether composition respectively. All be equipped with filter screen 13 in first storage tank 11 and the second storage tank 12, can filter the solid matter in the foaming component, avoid annotating the material in-process and appear blockking up.
Foaming component feeding system includes first feed pump 21, second feed pump 22, and first feed pump 21, second feed pump 22 are the gear pump, are driven by a motor 27 respectively, are connected with corresponding storage tank through inhaling material pipeline 23, inhale to be equipped with on the material pipeline 23 and inhale material valve 24. The outlets of the first feeding pump 21 and the second feeding pump 22 are respectively connected with a pumping pipeline 25, a pumping valve 26 is arranged on the pumping pipeline 25, and the pumping valve 26 is a manual valve. The motor 27 of the gear pump is a speed regulating motor 27, and the flow rate of the gear pump is controlled by the rotating speed of the speed regulating motor 27. The gear pump is prior art, inside is equipped with intermeshing's owner, driven gear, it is main, driven gear constitutes sealed working volume with both ends lid and the pump body together, the meshing point of gear separates left and right two chambeies, formed and inhaled, press the material chamber, the teeth of a cogwheel that the intracavity was inhaled in the left side breaks away from the meshing, sealed working chamber volume constantly increases, form partial vacuum, the foaming component is from the storage tank under the atmospheric pressure effect through inhaling the material chamber of inhaling that the material pipe got into the gear pump, and the pressure material chamber on right side is brought into by rotatory teeth of a cogwheel. The gear teeth in the right pressing cavity are meshed continuously, so that the volume of the sealed working cavity is reduced, and the foaming component is extruded and discharged. During the meshing process of the gear pump, a meshing point separates a material suction area and a material pressing area along a meshing line.
The injection system includes a manifold joint 31 and an injection tube 32. Referring to fig. 2, the manifold joint 31 has a first feeding end 33 connected to the first feeding pump 21, a second feeding end 34 connected to the second feeding pump 22, and a discharging end 35 connected to the injecting pipe 32, wherein the first feeding end 33 and the second feeding end 34 are respectively provided with an air injection joint 36, and the air injection joints 36 are quick air pipe joints and are arranged perpendicular to the axes of the first feeding end 33 and the second feeding end 34 for connecting to an air supply system, which will be described in detail below. It should be noted that fig. 1 is a schematic view only, and the positions of the two gas-injection joints 36 are not shown. The first feeding end 33 and the second feeding end 34 are symmetrically arranged relative to the discharging end 35 and are in an inclined state to form a Y-shaped structure, and the discharging end 35 connected with the feeding pipe 32 corresponds to the vertical stroke of the Y-shaped lower part. The injection pipe 32 is inserted into the opening 74 of the outer pipe 71, and injects the foaming material into an inter-pipe annulus between the inner pipe 72 and the outer pipe 71 of the polyurethane foam insulation pipe. The injection pipe 32 includes a section of transparent pipe 37 and a section of galvanized steel pipe 38 with a quarter gauge, and the transparent pipe 37 is a flexible pipe, so that the position of the outlet end of the injection pipe 32 can be conveniently adjusted, and the state of the foaming component inside the manifold joint 31 can be conveniently observed. And a cleaning port 39 is also arranged on one side of the manifold joint 31, which is back to the discharge end 35, and the cleaning port 39 is used for introducing a cleaning medium to clean the manifold joint 31 and the material injection pipe 32.
The air supply system includes an air tank 41 and an air compressor (omitted from the drawings), the air tank 41 forming a compressed air source, and the air compressor being configured to inject air into the air tank 41. The air tank 41 is connected to the manifold joint 31 through an air supply line 42, and an air supply valve 43 is provided on the air supply line 42. In the foaming process of the insulating layer 73, compressed air in the air storage tank 41 enters the manifold joint 31, and the two foaming components of the polyisocyanate and the combined polyether are fully mixed under the pushing of the compressed air and are injected into the annulus between the pipes.
And the control system controls the pumping time according to the injection quantity requirement of the foaming material and the pumping speed of the two foaming components, and stops injecting the foaming material when the set pumping time is reached. Specifically, the control system comprises an operation table 51, wherein a motor on button 52 and a motor off button 53 are arranged on the operation table 51, the motor on button 52 is used for controlling the motors 27 of the first supply pump 21 and the second supply pump 22 to be turned on simultaneously, and the motor off button 53 is used for controlling the motors 27 of the first supply pump 21 and the second supply pump 22 to be turned off simultaneously, so that the two foaming components can be quantitatively injected in a set ratio. The operation table 51 is further provided with a material stopping control device 54, which can control the two pumping valves 26 to simultaneously act, so as to realize synchronous closing and synchronous opening. The operation table 51 is further provided with a timing device 55, the timing device 55 comprises a start timing button 56 and an end timing button 57, the timing device can indicate the material injection time required by the foaming of the single polyurethane foaming thermal insulation pipe, and after the material injection time is reached, the injection of the two foaming components is stopped through the material stopping control device 54, so that the raw material waste is avoided. Of course, in other embodiments, a time delay relay may be provided, and the motor 27 is automatically controlled to be turned off by the time delay relay after the material injection time is reached.
The foaming platform system comprises a positioning workbench 61, the positioning workbench 61 comprises two steel pipes 62 with the diameter of 355mm, the two steel pipes 62 are welded through connecting rib plates 63, the distance between the two steel pipes 62 is controlled to be 120mm-150mm, and positioning grooves for positioning and placing the polyurethane foaming heat-insulating pipes to be processed are formed. The foaming platform system further includes two end plugs 64 for plugging both ends of the annulus between the tubes.
The foaming method of the heat-insulating layer of the polyurethane foaming heat-insulating pipe comprises the following specific steps:
step one, horizontally placing a polyurethane foaming heat-insulating pipe to be processed on a positioning workbench 61. Specifically, a supporting wood block 75 which is consistent with the outer diameter of the inner pipe 72 and the radial dimension of the annulus between the pipes is selected and supported between the inner pipe 72 and the outer pipe 71, the eccentricity of the heat insulation layer 73 after foaming is ensured to meet the requirement, and the outer pipe 71 and the inner pipe 72 in the polyurethane foaming heat insulation pipe to be foamed are plugged by the end plug 64. In addition, the positioning of the polyurethane foaming heat-insulating pipe to be processed is realized by the positioning groove on the positioning workbench 61;
step two, processing a drill hole 74 with the aperture phi of 21mm in the axial middle part of the outer pipe 71;
step three, inserting the material injection pipe 32 into the drill hole 74;
step four, determining parameters such as the rotating speed of a motor 27 of the gear pump, the mixed working pressure of the polyisocyanate and the combined polyether material (namely the pressure of compressed gas introduced into the manifold joint 31), the pressure of a compressed gas source, the consumption of foaming components, the material injection time and the like, and starting an air compressor, wherein the air compressor is filled with pressure gas with certain pressure into the gas storage tank 41; the gas supply valve 43 on the gas supply line 42 is opened and the compressed gas enters the injection pipe 32.
And step five, operating the first feed pump 21 and the second feed pump 22 of the foaming component feed system, injecting materials into a manifold joint 31 of the injection system at a certain flow rate, uniformly mixing two foaming components injected into the manifold joint 31 at the manifold joint 31 under the drive of compressed gas, then pushing the mixture into an inter-pipe annulus under the action of the compressed gas, and rapidly pushing the mixture from the middle of the polyurethane foaming heat-insulating pipe to two ends of the polyurethane foaming heat-insulating pipe.
And step six, after the material injection time reaches the set value, stopping the injection of the two foaming components through the material stopping control device 54, and closing the first feeding pump 21 and the second feeding pump 22 through the motor off button 53 to avoid the waste of raw materials.
And step seven, plugging the drilled hole in the axial middle part of the outer pipe 71, and completing the molding of the heat insulation layer 73 after the foaming material is cured.
And step eight, cleaning the injection pipe, wherein during cleaning, a cleaning medium is introduced into the manifold joint 31 through a cleaning port 39 which is arranged on the manifold joint 31 and is in line with the discharge end 35, so that the injection pipe 32 is cleaned. The cleaning medium can be compressed air, water or other fluid.
The foaming material can reach the both ends of polyurethane foaming insulating tube fast under compressed gas's drive, compares in the mode that relies on the foaming material to flow by oneself, annotates the material more evenly, and efficiency is higher, and the injection process time-consuming only needs 18-20 seconds in this embodiment, and the curing time of foaming material is shorter than annotating the material process time-consuming.
It should be noted that, as the skilled person would understand, the above-mentioned numbering of the steps does not represent a necessary order, and the corresponding steps may be performed in a forward or backward order or synchronously.
Example 2 of the method for foaming the insulation layer of the polyurethane foam insulation pipe of the present invention:
the present embodiment is different from embodiment 1 in that: in embodiment 1, a transparent pipe section 37 is disposed between the discharge port of the injection pipe 32 and the gas injection joint 36. In this embodiment, the injection pipe 32 is a whole pipe and is directly connected to the injection joint 36.
Example 3 of the method for foaming the insulation layer of the polyurethane foam insulation pipe of the present invention:
the present embodiment is different from embodiment 1 in that: in embodiment 1, the manifold joint 31 includes a first feeding end 33 connected to the first feeding pump 21, a second feeding end 34 connected to the second feeding pump 22, and a discharging end 35 connected to the injecting pipe 32, which are formed in a Y-shape. In this embodiment, the first and second inlet ends 33 and 34 are arranged in line and form a T-shaped configuration with the outlet end 35.
Example 4 of the method for foaming the insulation layer of the polyurethane foam insulation pipe of the present invention:
the present embodiment is different from embodiment 1 in that: in example 1, the first feeding end 33 and the second feeding end 34 of the manifold joint 31 are respectively provided with one gas injection joint 36. In this embodiment, only one gas injection fitting 36 is provided at the manifold fitting 31, and the gas injection fitting 36 is located at the intersection of the first feed end 33 and the second feed end 34. In other embodiments, the gas injection fitting 36 may be disposed at the purge port 39 on the side of the manifold fitting 31 facing away from the discharge end 35.
Example 5 of the method for foaming the insulation layer of the polyurethane foam insulation pipe of the present invention:
the present embodiment is different from embodiment 1 in that: in embodiment 1, the pumping pipelines 25 corresponding to the first feeding pump 21 and the second feeding pump 22 are both provided with pumping valves 26, and the pumping valves 26 are manual valves. In this embodiment, the pumping valve 26 is a solenoid valve.
In other embodiments of the method for foaming the insulating layer of the polyurethane foam insulating pipe, the material injection pipe 32 may be inserted into one end of the inter-pipe annulus and injected from one end to the other end; in this case, the polyurethane foam heat-insulating pipe may be placed obliquely.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.
Claims (10)
1. The foaming method of the heat insulation layer of the polyurethane foaming heat insulation pipe is characterized by comprising the following steps:
introducing compressed gas into a material injection pipe (32), wherein the material injection pipe (32) is used for injecting foaming materials into an inter-pipe annulus between an inner pipe (72) and an outer pipe (71) of a polyurethane foaming heat-insulation pipe;
and step two, pumping two foaming components required by polyurethane foaming into the material injection pipe (32), and pushing the foaming material into the annulus between the pipes by virtue of compressed gas.
2. The method of claim 1, wherein before the two foaming components required for foaming the polyurethane are mixed, compressed gas is introduced into the conveying passages of the two foaming components to uniformly mix the two foaming components.
3. The insulation layer foaming method of the polyurethane foam insulation pipe according to claim 2, wherein the compressed gas is injected through a manifold joint (31), the manifold joint (31) comprises a first feeding end (33) connected with the first feeding pump (21), a second feeding end (34) connected with the second feeding pump (22) and a discharging end (35) connected with the injecting pipe (32), the first feeding end (33) and the second feeding end (34) are respectively provided with an air injection joint (36), and the compressed gas is injected through the air injection joint (36).
4. The method of foaming insulation of polyurethane foam insulation pipe according to claim 3, wherein the first feed end (33) and the second feed end (34) are arranged symmetrically with respect to the discharge end (35).
5. The method of foaming insulation of polyurethane foam insulation pipe according to claim 4, wherein the first feeding end (33), the second feeding end (34) and the discharging end (35) are arranged in a Y-shaped configuration.
6. The method for foaming an insulation layer of a polyurethane foam insulation pipe according to any one of claims 3 to 5, characterized in that the method for foaming an insulation layer further comprises a step of cleaning the injection pipe, and during cleaning, a cleaning medium is introduced into the manifold joint (31) through a cleaning port (39) arranged on the manifold joint (31) in line with the discharge end, so that the manifold joint (31) and the injection pipe (32) are cleaned.
7. The method of claim 6, wherein the pumping valves (26) connected to the first and second feed ends (33, 34) are closed before the cleaning.
8. The method of foaming an insulation layer of a polyurethane foam insulation pipe according to any one of claims 1 to 5, wherein when the foaming material is injected, the inner pipe (72) and the outer pipe (71) of the polyurethane foam insulation pipe are placed in a horizontal direction, both ends of the inter-pipe annulus are sealed, and the foaming material is injected into the inter-pipe annulus from the middle of the outer pipe (71) in the longitudinal direction.
9. The method for foaming an insulation layer of a polyurethane foam insulation pipe according to any one of claims 1 to 5, wherein the pumping time is controlled according to the injection amount requirement of the foaming material of a single insulation pipe and the pumping speed of two foaming components, and the foaming material is stopped being injected when the set pumping time is reached.
10. The method of foaming an insulation layer of a polyurethane foam insulation pipe according to any one of claims 1 to 5, wherein the injection pipe (32) is provided to include a transparent pipe section (37).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111273668.XA CN114012966A (en) | 2021-10-29 | 2021-10-29 | Method for foaming heat-insulating layer of polyurethane foaming heat-insulating pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111273668.XA CN114012966A (en) | 2021-10-29 | 2021-10-29 | Method for foaming heat-insulating layer of polyurethane foaming heat-insulating pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114012966A true CN114012966A (en) | 2022-02-08 |
Family
ID=80059019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111273668.XA Pending CN114012966A (en) | 2021-10-29 | 2021-10-29 | Method for foaming heat-insulating layer of polyurethane foaming heat-insulating pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114012966A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210319633A1 (en) * | 2020-04-08 | 2021-10-14 | The Boeing Company | Anomaly prediction and detection for aircraft equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012024682A (en) * | 2010-07-22 | 2012-02-09 | Abino:Kk | Device for charging foamed urethane, and injection gun for charging foamed urethane |
| JP2012112503A (en) * | 2010-11-26 | 2012-06-14 | Abino:Kk | Foamable urethane filling device, and injection gun for filling foamable urethane |
| JP2018134598A (en) * | 2017-02-22 | 2018-08-30 | 油化三昌建材株式会社 | Injection device of hard urethane foam |
| CN111688098A (en) * | 2020-07-07 | 2020-09-22 | 大连开元管道有限公司 | Super-large filling volume high-pressure foaming unit |
-
2021
- 2021-10-29 CN CN202111273668.XA patent/CN114012966A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012024682A (en) * | 2010-07-22 | 2012-02-09 | Abino:Kk | Device for charging foamed urethane, and injection gun for charging foamed urethane |
| JP2012112503A (en) * | 2010-11-26 | 2012-06-14 | Abino:Kk | Foamable urethane filling device, and injection gun for filling foamable urethane |
| JP2018134598A (en) * | 2017-02-22 | 2018-08-30 | 油化三昌建材株式会社 | Injection device of hard urethane foam |
| CN111688098A (en) * | 2020-07-07 | 2020-09-22 | 大连开元管道有限公司 | Super-large filling volume high-pressure foaming unit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210319633A1 (en) * | 2020-04-08 | 2021-10-14 | The Boeing Company | Anomaly prediction and detection for aircraft equipment |
| US11580794B2 (en) * | 2020-04-08 | 2023-02-14 | The Boeing Company | Anomaly prediction and detection for aircraft equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN216506349U (en) | Heat preservation foaming device of polyurethane foaming insulating tube | |
| CN114012966A (en) | Method for foaming heat-insulating layer of polyurethane foaming heat-insulating pipe | |
| CN112706349B (en) | Dicyclopentadiene-based reaction injection molding system | |
| JPS61229513A (en) | Method and device for manufacturing bubble form consisting of at least two kind of reactive plastic component and liquefied foaming agent | |
| CN103057061A (en) | Device and method for efficient mixed microcellular foaming plastic precise injection molding | |
| CN109397538B (en) | Foam cement slurry generator, cement slurry pressurized inflation device and application thereof | |
| CN210385624U (en) | Foam material generating device for plugging high-temperature coal rock cracks | |
| CN200989213Y (en) | Pressure injection polyurethane hole sealing pump | |
| CN205991333U (en) | A kind of bidirectional multifunctional mixture manifold system being applied to cementing unit | |
| CN213953578U (en) | Integrated water supply and liquid distribution equipment | |
| CN112792496B (en) | Aluminum supplementing device and aluminum supplementing method in welded pipe production line | |
| CN108798600B (en) | Oil well corrosion inhibitor filling device | |
| CN111305026A (en) | Polymer mixes slip casting rifle | |
| CN210453148U (en) | Glaze discharging device and system and glazing and glaze discharging device and system | |
| CN205572720U (en) | Cement foam maker | |
| CN212052252U (en) | Polymer mixes slip casting rifle | |
| CN201676782U (en) | Special foaming gun of outer heat-insulation system for thin plastering of polystyrene plate | |
| CN110924970A (en) | Liquid CO2Phase-change hydraulic cutting device | |
| CN215202672U (en) | Full-automatic bentonite mixing equipment | |
| CN209989294U (en) | Stack formula rubber waste desulfurization plasticator | |
| CN213078274U (en) | Feeding and mixing device of compound feed for aquaculture | |
| CN220741609U (en) | Curing device for autoclaved aerated concrete plate | |
| CN213648595U (en) | Feeding device for adding liquid to double-screw extruder | |
| CN212400109U (en) | Convenient unloading mechanism of high-pressure foaming machine | |
| CN212498837U (en) | Injection molding device for plastic production |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |