CN117624882A - Conveying pipe, manufacturing method of conveying pipe and pumping equipment - Google Patents
Conveying pipe, manufacturing method of conveying pipe and pumping equipment Download PDFInfo
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- CN117624882A CN117624882A CN202210995453.7A CN202210995453A CN117624882A CN 117624882 A CN117624882 A CN 117624882A CN 202210995453 A CN202210995453 A CN 202210995453A CN 117624882 A CN117624882 A CN 117624882A
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- inner tube
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Abstract
The invention relates to the technical field of accessories of operation machinery, in particular to a conveying pipe, a manufacturing method of the conveying pipe and pumping equipment. The invention provides a conveying pipe, comprising: an outer tube; the inner tube is sleeved in the outer tube, an elastic buffer layer is arranged between the outer tube and the inner tube, pore structures are distributed on at least the inner wall surface of the inner tube, and wear-resistant high polymer materials are filled in the pore structures. The conveying pipe, the manufacturing method of the conveying pipe and the pumping equipment provided by the invention can effectively improve the wear resistance and the impact resistance of the conveying pipe.
Description
Technical Field
The invention relates to the technical field of pumping equipment, in particular to a conveying pipe, a manufacturing method of the conveying pipe and the pumping equipment.
Background
The conveying pipe is one of important parts of pump truck equipment, and the pump truck equipment conveys cement mortar to a grouting position through the conveying pipe for grouting. The conveying pipe is impacted and rubbed by the cement mortar in the process of conveying the cement mortar, so that the conveying pipe needs to have better wear resistance and impact resistance.
The delivery tube is typically provided in the form of a double tube structure comprising an inner tube and an outer tube, the inner tube being sleeved inside the outer tube. In the related art, in order to improve the wear resistance of the inner tube, the inner tube is provided with a ceramic plate or a ceramic particulate material. However, the abrasion resistance and impact resistance of the inner tube of this structure remain poor.
Therefore, how to improve the wear resistance and impact resistance of the conveying pipe is an important technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a conveying pipe, a manufacturing method of the conveying pipe and pumping equipment, which can effectively improve the wear resistance and impact resistance of the conveying pipe.
A first aspect of the invention provides a delivery tube comprising:
an outer tube;
the inner tube is sleeved in the outer tube, an elastic buffer layer is arranged between the outer tube and the inner tube, pore structures are distributed on at least the inner wall surface of the inner tube, and wear-resistant high polymer materials are filled in the pore structures.
According to the conveying pipe provided by the invention, the inner pipe is constructed as an integrally formed ceramic pipe, and the wear-resistant high polymer material is in composite connection with the inner pipe through a centrifugal casting process.
According to the conveying pipe provided by the invention, the porosity of the inner pipe is greater than or equal to 50%, and the pore structures are uniformly distributed on the inner pipe.
According to the conveying pipe provided by the invention, the material of the elastic buffer layer comprises at least one of polyurethane, vulcanized rubber and organic silicon rubber.
According to the conveying pipe provided by the invention, the elastic buffer layer comprises the following materials in parts by mass:
isocyanate-terminated prepolymer: 100 parts; diamine crosslinking agents or glycol crosslinking agents: 20-50 parts of a lubricant; or,
the elastic buffer layer comprises the following materials in parts by mass:
polymer polyol: 100 parts; small molecule chain extenders: 0-20 parts; diphenylmethane-4, 4' -diisocyanate: 10-50 parts.
According to the conveying pipe provided by the invention, the wear-resistant high polymer material comprises at least one of nylon, epoxy resin, phenolic modified epoxy resin and unsaturated polyester resin.
According to the conveying pipe provided by the invention, the wear-resistant high polymer material comprises the following components in parts by mass:
caprolactam: 100 parts; sodium hydroxide: 0.08-0.3 part; isocyanate: 0.1-0.4 part; toughening agent: 0-15 parts.
According to the conveying pipe provided by the invention, the elastic buffer layer is compounded on the outer peripheral surface of the inner pipe, the inner pipe provided with the elastic buffer layer is arranged in the outer pipe through a cold pressing process, and the elastic buffer layer is in interference fit with the outer pipe.
A second aspect of the present invention provides a method of manufacturing a delivery tube, comprising:
filling wear-resistant high polymer materials into pore structures of an inner pipe, wherein the pore structures are at least distributed on the inner wall surface of the inner pipe;
compounding an elastic buffer material on the outer wall surface of the inner tube so as to form an elastic buffer layer on the outer wall surface of the inner tube;
the inner tube is sleeved inside the outer tube, and the outer tube and the inner tube are fixedly connected.
According to the manufacturing method of the conveying pipe provided by the invention, the wear-resistant polymer material is filled in the pore structure of the inner pipe, and the manufacturing method comprises the following steps:
heating the inner tube to a first preset temperature;
and placing the heated inner tube into a centrifugal casting mold, and filling the wear-resistant polymer material into the pore structure of the inner tube through a centrifugal casting process.
According to the manufacturing method of the conveying pipe provided by the invention, the elastic buffer material is compounded on the outer wall surface of the inner pipe, and the manufacturing method comprises the following steps:
plugging the pipe orifice of the inner pipe;
placing the inner pipe with the pipe orifice plugged into a casting mold, and casting an elastic buffer material on the outer wall surface of the inner pipe through a casting process;
placing the casting mold and the inner tube into an oven together for heat drying treatment;
demolding the inner tube subjected to the heat drying treatment;
and (3) putting the demolded inner tube into an oven, and curing the elastic buffer material on the outer wall surface of the inner tube.
According to the manufacturing method of the conveying pipe provided by the invention, the inner pipe is sleeved inside the outer pipe, and the outer pipe and the inner pipe are fixedly connected, and the manufacturing method comprises the following steps:
performing low-temperature cooling treatment on the inner tube with the elastic buffer material compounded on the outer wall surface so as to enable the elastic buffer material to shrink;
sleeving the inner tube after the elastic buffer material is contracted into the outer tube;
the outer tube and the inner tube which are sleeved together are placed in a normal temperature environment, so that the elastic buffer material is expanded, and interference fit of the outer tube and the inner tube is further realized.
According to the manufacturing method of the conveying pipe provided by the invention, the wear-resistant polymer material is filled in the pore structure of the inner pipe, and the manufacturing method comprises the following steps:
preparing a wear-resistant high polymer material;
adding a wear-resistant polymer material into a centrifugal casting mold, and filling the wear-resistant polymer material into the pore structure of the inner pipe through a centrifugal casting process; wherein,
the preparation of the wear-resistant polymer material comprises the following steps:
adding 100 parts of caprolactam and 0-15 parts of toughening agent into a reaction kettle for heating to melt the caprolactam and the toughening agent;
carrying out vacuum dehydration treatment on caprolactam and a toughening agent in a molten state in a reaction kettle;
adding 0.08-0.3 part of sodium hydroxide into the reaction kettle, and then continuing vacuum dehydration treatment;
adding 0.1-0.4 part of isocyanate into the reaction kettle to form the wear-resistant high polymer material.
According to the manufacturing method of the conveying pipe provided by the invention, the elastic buffer material is compounded on the outer wall surface of the inner pipe, and the manufacturing method comprises the following steps:
preparing an elastic buffer material;
adding the prepared elastic buffer material into a casting mold, and casting the elastic buffer material on the outer wall surface of the inner pipe through a casting process; wherein,
the preparation of the elastic buffer material comprises the following steps:
adding 100 parts by mass of isocyanate end-capped prepolymer into a reaction kettle, heating, and carrying out vacuum defoaming treatment;
adding 20-50 parts of diamine cross-linking agent or glycol cross-linking agent in a molten state into a reaction kettle, and stirring and vacuum defoaming to form the elastic buffer material; or,
the preparation of the elastic buffer material comprises the following steps:
adding 100 parts by mass of polymer polyol and 0-20 parts by mass of small molecular chain extender into a reaction kettle for heating, and carrying out vacuum defoaming treatment;
10-50 parts of diphenylmethane-4, 4' -diisocyanate in a molten state are added into a reaction kettle, and stirring and vacuum defoaming treatment are carried out to form the elastic buffer material.
A third aspect of the invention provides a pumping apparatus comprising a conveying pipe for conveying a material, the conveying pipe being as claimed in any one of the preceding claims; alternatively, the delivery tube is manufactured by the method of manufacturing a delivery tube as described in any one of the above.
According to the conveying pipe provided by the invention, the conveying pipe comprises the inner pipe and the outer pipe which are sleeved together, the inner pipe is provided with the pore structures, and the pore structures are filled with the wear-resistant polymer materials, when the conveying pipe is used for conveying cement mortar, sand particles in the cement mortar can be simultaneously contacted with the inner pipe body and the wear-resistant polymer materials in the pore structures, and the wear-resistant polymer materials can fully absorb the impact and friction of the sand particles, so that the abrasion and impact of the sand particles to the inner pipe are avoided. Meanwhile, as the elastic buffer layer is filled between the outer pipe and the inner pipe, when the inner pipe is impacted by cement mortar in a large area, the elastic buffer layer can play an effective role in buffering, and the problem that the inner pipe is easy to damage when being impacted by the large area of the strong force is avoided. By the arrangement, the conveying pipe provided by the invention has better wear resistance and impact resistance.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a conveying pipe according to an embodiment of the present invention;
FIG. 2 is an enlarged view of the portion A of FIG. 1;
FIG. 3 is a schematic diagram of a method for manufacturing a conveying pipe according to an embodiment of the present invention.
Reference numerals:
11: an outer tube; 12: an elastic buffer layer; 13: an inner tube; 14: a flange; 15: wear-resistant sleeve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The conveying pipe of the pumping equipment is used for conveying cement mortar to a to-be-poured position of a construction site, the cement mortar has higher pressure in the conveying pipe, so that the cement mortar can cause large-area impact on the conveying pipe, and meanwhile, sand particles in the cement mortar can also form friction and impact on fine positions of the conveying pipe in the process of flowing the cement mortar in the conveying pipe. In the related art, the conveying pipe is difficult to realize large-area impact prevention and wear prevention at all fine positions.
Based on the above technical problem, the embodiment of the invention provides a conveying pipe, which comprises an outer pipe 11 and an inner pipe 13, wherein the inner pipe 13 is sleeved in the pipe of the outer pipe 11, so that a double-layer sleeve structure is formed.
In some embodiments, the outer tube 11 may be a low carbon steel material, an alloy material, or the like. The inner tube 13 can be made of ceramic, and the ceramic has high hardness and wear resistance. In this embodiment, an elastic buffer layer 12 is disposed between the outer tube 11 and the inner tube 13, and at least the inner wall surface of the inner tube 13 is distributed with a pore structure, and the pore structure is filled with a wear-resistant polymer material.
It should be noted that the body of the inner tube 13 has a pore structure distributed thereon, and specifically, the pore structure may be formed by a special treatment in the production process of the body of the inner tube 13. For example, when the body of the inner tube 13 is made of ceramic, a plurality of pores may be formed in the body of the inner tube 13 during sintering, and the pores may form the pore structure.
Each adjacent pore structure can be mutually communicated inside, so that the wear-resistant polymer materials filled in the pore structures are mutually connected, and the wear-resistant polymer materials have better binding force with the body of the inner tube 13.
When the conveying pipe provided by the embodiment is used for conveying cement mortar, sand particles in the cement mortar can be simultaneously contacted with the inner pipe 13 body and the wear-resistant high polymer materials in the pore structures, and the wear-resistant high polymer materials can fully absorb the impact and friction of the sand particles, so that the abrasion and impact of the sand particles on the fine positions of the conveying pipe are avoided. Meanwhile, since the elastic buffer layer 12 is filled between the outer tube 11 and the inner tube 13, when the inner tube 13 is impacted by cement mortar in a large area, the elastic buffer layer 12 can play an effective role in buffering, and the problem that the inner tube 13 is easy to damage when being impacted by the cement mortar in a large area is avoided. By the arrangement, the conveying pipe provided by the embodiment of the invention has the advantages of better considering the impact prevention effect on a large area and the impact prevention and wear prevention effects on fine positions of various places.
In a further embodiment, the inner tube 13 is constructed as a ceramic tube of integrally formed construction. In some embodiments, the ceramic tube may be formed by a sintering process. Compared with a ceramic tube formed by bonding ceramic particles, the ceramic tube provided by the embodiment is of an integrated structure, has high overall strength, and can avoid the problem of local falling off due to abrasion or impact.
In this embodiment, the wear-resistant polymer material is compositely connected with the body of the inner tube 13 through a centrifugal casting process, so that the process is simple, and the wear-resistant polymer material can be uniformly connected on the inner wall surface of the inner tube 13.
In a further embodiment, the porosity of the inner tube 13 is greater than or equal to 50% and the pore structure is uniformly distributed on the inner tube 13. For example, the porosity of the inner tube 13 may be 50%, 55%, 60%, etc. It should be understood that the porosity of the inner tube 13 herein refers to the proportion of the pore structure of the inner tube 13 to the total volume of the inner tube 13. The porosity of the inner tube 13 is greater than or equal to 50%, and enough wear-resistant high polymer materials can be filled, so that the inner tube 13 is ensured to have higher toughness, wear resistance and corrosion resistance.
The abrasion-resistant polymeric material filled in the gap structure may include at least one of nylon, epoxy, phenolic-modified epoxy, and unsaturated polyester. In one embodiment, the wear-resistant polymer material comprises the following components in parts by mass:
caprolactam: 100 parts; sodium hydroxide: 0.08-0.3 part; isocyanate: 0.1-0.4 part; toughening agent: 0-15 parts. The wear-resistant polymer material formed by the formula has higher toughness, wear resistance and corrosion resistance.
In this example, the isocyanate includes, but is not limited to, HDI (hexamethylene diisocyanate), MDI (diphenylmethane diisocyanate), liquefied MDI, polymeric MDI, TDI (toluene diisocyanate), NDI (1, 5-naphthalene diisocyanate), IPDI (isophorone diisocyanate), hydrogenated TDI, hydrogenated MDI, hydrogenated IPDI, and isocyanate-terminated prepolymers thereof. Toughening agents include, but are not limited to, polyether polyols, polyether polyamines, hydroxyl terminated liquid butyl rubber.
During the material mixing, caprolactam and the toughening agent are added into a reaction kettle, heated to 110-130 ℃ to be molten, and subjected to vacuum dehydration for 10-20min, then sodium hydroxide is added, and vacuum dehydration is continued for 10-20min, and then isocyanate is added, so that the wear-resistant polymer material is formed. After the wear-resistant polymer material is formed, the wear-resistant polymer material is required to be quickly added into a die, so that the wear-resistant polymer material is in composite connection with the inner pipe 13.
The material of the elastic buffer layer 12 disposed between the inner tube 13 and the outer tube 11 may include at least one of polyurethane, vulcanized rubber, and silicone rubber.
In one embodiment, the material of the elastic buffer layer 12 comprises the following components in parts by mass:
isocyanate-terminated prepolymer: 100 parts; diamine crosslinking agents or glycol crosslinking agents: 20-50 parts.
In this example, the isocyanate terminated prepolymer includes, but is not limited to, a TDI terminated polyether polyol, a TDI terminated polyester polyol, a TDI terminated polycaprolactone polyol, an MDI terminated polyether polyol, an MDI terminated polyester polyol, an MDI terminated polycaprolactone polyol.
Diamine-based crosslinkers are used in TDI terminated prepolymers including, but not limited to, MOCA (polyurethane curing agent), 3-chloro-3 ' -ethyl-4, 4' -diaminodiphenylmethane, 3-chloro-4, 4' -diaminodiphenylmethane, hydroquinone dihydroxyethyl ether, hydroxyethylated hydroquinone, resorcinol-bis (. Beta. -hydroxyethyl) ether, 1, 3-propanediol bis (4-aminobenzoate), polytetramethylene ether glycol bis-p-aminobenzoate, diethyltoluenediamine (DETDA).
Glycol based crosslinkers are used for MDI terminated prepolymers including, but not limited to BDO (1, 4-butanediol), ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol.
When the elastic buffer material is prepared, the isocyanate-terminated prepolymer can be added into a reaction kettle, heated to 80-90 ℃, defoamed in vacuum for 30min, added with a melted diamine cross-linking agent or glycol cross-linking agent, stirred and defoamed for 10min. The elastic buffer material formed in this way has better elasticity, durability and corrosion resistance. After the elastic buffer material is formed, the elastic buffer material needs to be quickly added into a mould, so that the elastic buffer material is in composite connection with the inner pipe 13.
In a further embodiment, the elastic buffer layer 12 is compounded on the outer peripheral surface of the inner tube 13, the inner tube 13 provided with the elastic buffer layer 12 is arranged in the outer tube 11 through a cold pressing process, and the elastic buffer layer 12 is in interference fit with the outer tube 11.
Specifically, the inner tube 13 compounded with the elastic buffer layer 12 can be subjected to cooling treatment at the temperature of-50 ℃ to-30 ℃, and then the inner tube 13 is cold-pressed into the outer tube 11 to form interference fit. Because the elastic buffer layer 12 contracts at low temperature and expands after the room temperature is restored, interference fit can be formed between the inner tube 13 and the outer tube 11, zero clearance fit is ensured, and because the elastic buffer layer 12 has elasticity, a large amount of impact can be absorbed, and further the inner tube 13 is ensured not to crack.
In the embodiment of the invention, a manufacturing method of the conveying pipe is also provided, which comprises the following steps:
s11, filling a wear-resistant polymer material into a pore structure of the inner pipe 13, wherein the pore structure is at least distributed on the inner wall surface of the inner pipe 13;
s12, compounding an elastic buffer material on the outer wall surface of the inner tube 13 so as to form an elastic buffer layer 12 on the outer wall surface of the inner tube 13;
s13, the inner tube 13 is sleeved inside the outer tube 11, and the outer tube 11 and the inner tube 13 are fixedly connected.
Thus, when the conveying pipe manufactured by the manufacturing method is used for conveying cement mortar, sand particles in the cement mortar can be simultaneously contacted with the inner pipe 13 body and the wear-resistant polymer materials in the pore structure, and the wear-resistant polymer materials can fully absorb the impact and friction of the sand particles, so that the abrasion and impact of the sand particles on the fine positions of the conveying pipe are avoided. Meanwhile, since the elastic buffer layer 12 is filled between the outer tube 11 and the inner tube 13, when the inner tube 13 is impacted by cement mortar, the elastic buffer layer 12 can play an effective role in buffering, and the problem that the inner tube 13 is easy to damage when being impacted by large-area strong force is avoided. By the arrangement, the conveying pipe provided by the embodiment of the invention has the advantages of better considering the impact prevention effect on a large area and the impact prevention and wear prevention effects on fine positions of various places.
In a further embodiment, in step S11, the step of filling the wear-resistant polymer material into the pore structure of the inner tube 13 may specifically include the steps of:
s111, heating the inner tube 13 to a first preset temperature; in this step, the inner tube 13 may be preheated to 150-160 ℃.
S112, the heated inner tube 13 is placed into a centrifugal casting mold, and the wear-resistant polymer material is filled into the pore structure of the inner tube 13 through a centrifugal casting process. In this step, the preheated inner tube 13 may be fixed in a centrifugal casting mold at 150 to 160 ℃. The rotational speed of the die is controlled to be 500-1500r/min during casting, so that the wear-resistant polymer material fully enters the pore structure of the inner tube 13 and is polymerized for 10min, and the wear-resistant polymer material and the inner tube 13 are in a composite structure. The wear-resistant polymer material can fully fill the pore structure of the inner tube 13 due to centrifugal casting, so that the toughness and wear resistance of the inner tube 13 are improved by utilizing the wear-resistant polymer material.
In a further embodiment, the step S12 of compounding the elastic buffer material on the outer wall surface of the inner tube 13 includes:
s121, plugging the orifice of the inner tube 13.
S122, placing the inner tube 13 with the tube orifice plugged into a casting mold, and casting an elastic buffer material on the outer wall surface of the inner tube 13 through a casting process; in this step, a gap of 1 to 6mm may be reserved between the outer peripheral surface of the inner tube 13 and the inner wall surface of the casting mold so that the elastic buffer material is cast in the gap to form the elastic buffer layer 12 of 1 to 6mm thickness.
S123, placing the casting mold and the inner tube 13 into an oven together for heat drying treatment; in this step, the casting mold and the inner tube 13 may be put into an oven at 110-120 ℃ to be baked for 30min.
S124, demolding the inner tube 13 after the heat drying treatment.
S125, the inner tube 13 after demoulding is put into an oven, and the elastic buffer material on the outer wall surface of the inner tube 13 is cured. In the step, the inner tube 13 after demoulding can be put into an oven at 110-120 ℃ for curing treatment, and the inner tube 13 with the outer wall uniformly adhered with the elastic buffer material is obtained.
In a further embodiment, the step S13 of sleeving the inner tube 13 inside the outer tube 11 and fixedly connecting the outer tube 11 and the inner tube 13 includes:
s131, performing low-temperature cooling treatment on the inner tube 13 with the elastic buffer material compounded on the outer wall surface so as to enable the elastic buffer material to shrink; specifically, the inner tube 13 with the elastic buffer material compounded on the outer wall surface can be placed in an environment of-50 ℃ to-30 ℃ for cooling treatment.
S132, sleeving the inner tube 13 after cold shrinkage of the elastic buffer material in the outer tube 11; specifically, the inner tube 13 after the elastic buffer material is shrunk is cold-pressed into the outer tube 11 through a cold-pressing process.
S133, placing the outer tube 11 and the inner tube 13 which are sleeved together into a normal temperature environment to expand the elastic buffer material, so that interference fit of the outer tube 11 and the inner tube 13 is realized. Because the elastic buffer material fully contracts at low temperature and expands after the room temperature is restored, interference fit can be formed between the inner tube 13 and the outer tube 11, zero clearance fit is ensured, and meanwhile, because the elastic buffer material has elasticity, a large amount of impact can be absorbed, and the inner tube 13 is ensured not to crack.
In a further embodiment, the preparation method of the wear-resistant polymer material includes the steps of:
s211, adding 100 parts of caprolactam and 0-15 parts of toughening agent into a reaction kettle for heating in parts by mass, so that the caprolactam and the toughening agent are melted; specifically, caprolactam and a toughening agent can be added into a reaction kettle, and heated to 110-130 ℃ to melt the caprolactam and the toughening agent; the isocyanate includes, but is not limited to, HDI (hexamethylene diisocyanate), MDI (diphenylmethane diisocyanate), liquefied MDI, polymeric MDI, TDI (toluene diisocyanate), NDI (1, 5-naphthalene diisocyanate), IPDI (isophorone diisocyanate), hydrogenated TDI, hydrogenated MDI, hydrogenated IPDI, and isocyanate-terminated prepolymers thereof. Toughening agents include, but are not limited to, polyether polyols, polyether polyamines, hydroxyl terminated liquid butyl rubber.
S212, carrying out vacuum dehydration treatment on caprolactam and a toughening agent in a molten state in a reaction kettle; specifically, vacuum dehydration may be performed for 10 to 20 minutes.
S213, adding 0.08-0.3 part of sodium hydroxide into the reaction kettle, and continuing vacuum dehydration treatment; specifically, vacuum dehydration may be continued for 10-20min.
S214, adding 0.1-0.4 part of isocyanate into the reaction kettle to form the wear-resistant high polymer material.
In a further embodiment, the method for preparing the elastic buffer material may include the steps of:
s311, adding 100 parts by mass of isocyanate end-capped prepolymer into a reaction kettle, heating, and carrying out vacuum defoaming treatment; specifically, the isocyanate-terminated prepolymer can be added into a reaction kettle, heated to 80-90 ℃ and defoamed in vacuum for 30min.
S312, adding 20-50 parts of diamine cross-linking agent or glycol cross-linking agent in a molten state into a reaction kettle, and stirring and vacuum defoaming to form the elastic buffer material; specifically, after adding the melted diamine-based crosslinking agent or glycol-based crosslinking agent, stirring and defoaming may be performed for 10 minutes.
In this embodiment, the isocyanate-terminated prepolymer includes, but is not limited to, a TDI-terminated polyether polyol, a TDI-terminated polyester polyol, a TDI-terminated polycaprolactone polyol, an MDI-terminated polyether polyol, an MDI-terminated polyester polyol, an MDI-terminated polycaprolactone polyol, and the like.
Diamine-based crosslinkers for TDI-terminated prepolymers including, but not limited to MOCA (polyurethane vulcanizing agent), 3-chloro-3 ' -ethyl-4, 4' -diaminodiphenylmethane, 3-chloro-4, 4' -diaminodiphenylmethane, hydroquinone dihydroxyethyl ether, hydroxyethylated hydroquinone, resorcinol-bis (β -hydroxyethyl) ether, 1, 3-propanediol bis (4-aminobenzoate), polytetramethylene ether glycol bis-p-aminobenzoate, diethyltoluenediamine (DETDA);
glycol based crosslinkers are used for MDI terminated prepolymers including, but not limited to BDO (1, 4-butanediol), ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol.
Alternatively, in another embodiment, a method of preparing an elastic cushioning material includes the steps of:
s411, adding 100 parts by mass of polymer polyol and 0-20 parts by mass of small molecular chain extender into a reaction kettle for heating, and carrying out vacuum defoaming treatment; specifically, the polymer polyol and the small molecular chain extender can be added into a reaction kettle, heated to 80-90 ℃ and defoamed in vacuum for 30min.
S412, adding 10-50 parts of diphenylmethane-4, 4' -diisocyanate in a molten state into a reaction kettle, and performing stirring and vacuum defoaming treatment to form the elastic buffer material; specifically, molten MDI can be added into a reaction kettle, stirred and defoamed for 10min.
The method for manufacturing a conveyor pipe according to the present invention will be described in detail with reference to specific examples.
Example 1
In this embodiment, the outer tube 11 is made of Q235B mild steel, and has an inner diameter of 130mm and a thickness of 2mm. The inner diameter of the inner tube 13 is 120mm, the thickness is 5mm, the main material of the inner tube 13 is 95 alumina, the porosity is 50%, and the wear-resistant polymer material is nylon. The thickness of the elastic buffer layer 12 is 2mm, and the material is cast polyurethane elastomer with the Shore A hardness of 60-80. The flange 14 at the end of the conveying pipe is made of Q235B, the conveying pipe is connected with the outer pipe 11 through welding, the wear-resistant sleeve 15 at the end of the conveying pipe is made of high-chromium cast iron Cr26, and the wear-resistant sleeve is embedded in the flange 14.
The manufacturing method of the conveying pipe of the embodiment comprises the following steps:
firstly, prefabricating an inner tube 13 made of 95 alumina ceramic material and having a three-dimensional communicated porous structure, preheating to 150-160 ℃, and then fixing the inner tube 13 in a centrifugal casting mould at 150-160 ℃;
nylon is centrifugally cast so that nylon fills uniformly within the pore structure of the inner tube 13. The specific process steps are as follows:
adding caprolactam and a toughening agent molecular weight 2000 polyether polyol PPG into a reaction kettle, heating and melting, vacuum dehydrating for 15min at the temperature of 120 ℃, adding sodium hydroxide, continuously vacuum dehydrating for 10-20min, adding MDI, rapidly pouring into a mold at 150-160 ℃, rotating the mold at the rotating speed of 1000r/min, polymerizing for 10min, and demolding to obtain the inner pipe 13 compounded with the wear-resistant polymer material. The mass ratio of the caprolactam to the PPG to the sodium hydroxide to the MDI is 100:5:0.12:0.3.
preparing polyurethane formula, adding PPG with molecular weight of 2000 and a small molecular chain extender BDO into a reaction kettle, heating to 80-90 ℃, vacuum defoaming for 30min, adding molten MDI, stirring, defoaming for 10min, and rapidly pouring into a mould with temperature of 110-130 ℃; wherein the mass ratio of PPG, BDO, MDI is 100:20:58.
After blocking the pipe orifice of the inner pipe 13, placing the inner pipe 13 into a mold filled with polyurethane formula, filling a gap of 3-5mm reserved between the outer wall of the inner pipe 13 and the inner wall of the mold with polyurethane formula, placing the mold into an oven at 110-120 ℃ for 30min, demolding, placing the demolded inner pipe 13 into the oven at 110-120 ℃ for post curing treatment, and obtaining the ceramic-nylon wear-resistant pipe with the outer wall uniformly adhered with polyurethane.
The inner tube 13 with the outer wall uniformly adhered with polyurethane is cooled at the temperature of minus 50 ℃ to minus 30 ℃ and is cold-pressed into the outer tube 11 made of low carbon steel material to form interference fit.
The flange 14 is welded to the outer tube 11 and is embedded in the wear sleeve 15.
Example two
In this embodiment, the outer tube 11 is made of Q235B low carbon steel, and has a large end inner diameter of 191mm and a small end inner diameter of 166mm, and a tube wall thickness of 3mm. The inner diameter of the large end of the inner tube 13 is 167mm, the inner diameter of the small end is 142mm, the tube wall thickness is 6mm, the inner tube 13 is made of silicon carbide with 50% of porosity, and nylon is used as a wear-resistant polymer material. The thickness of the elastic buffer layer 12 is 2mm, and the material is cast polyurethane elastomer with the Shore A hardness of 60-80. The flange 14 at the end of the conveying pipe is made of Q235B, the conveying pipe is connected with the outer pipe 11 through welding, the wear-resistant sleeve 15 at the end of the conveying pipe is made of high-chromium cast iron Cr26, and the wear-resistant sleeve is embedded in the flange 14.
The manufacturing method of the conveying pipe of the embodiment is as follows:
the silicon carbide ceramic taper pipe with the three-dimensional communicated porous structure is prefabricated as the inner pipe 13, the inner pipe 13 is preheated to 150-160 ℃, and then the inner pipe 13 is fixed in a centrifugal casting mould at 150-160 ℃.
And (3) centrifugally casting nylon to ensure that the nylon is uniformly filled in the pores of the porous ceramic tube. The specific process steps are as follows: adding caprolactam and a toughening agent molecular weight 2000 polyether polyol PTMEG into a reaction kettle, heating and melting, vacuum dehydrating for 15min at the temperature of 120 ℃, adding sodium hydroxide, continuously vacuum dehydrating for 10-20min, adding MDI, rapidly pouring into a mold at 150-160 ℃, rotating the mold at the speed of 1000r/min, polymerizing for 10min, and demolding to finish the preparation of the inner pipe 13. Wherein, the mass ratio of the caprolactam to the PTMEG to the sodium hydroxide to the MDI is 100:5:0.12:0.3.
preparing a polyurethane formula, adding polycaprolactone polyol PCL with the molecular weight of 2000 and a small molecular chain extender BDO into a reaction kettle, heating to 80-90 ℃, vacuum defoaming for 30min, adding molten MDI, stirring, defoaming for 10min, and rapidly pouring into a mould with the temperature of 110-130 ℃, wherein the mass ratio of PCL, BDO, MDI is 100:20:58.
After the pipe orifice of the inner pipe 13 is plugged, the inner pipe 13 is placed in a mold filled with polyurethane formula, the polyurethane formula fills a gap of 3-5mm reserved between the outer wall of the inner pipe 13 and the inner wall of the mold, the mold is placed in an oven at 110-120 ℃ for 30min, the mold is demolded, and the demolded inner pipe 13 is placed in the oven at 110-120 ℃ for curing treatment, so that the ceramic-nylon wear-resistant inner pipe 13 with the outer wall uniformly adhered with polyurethane is obtained.
The inner tube 13 is cooled at the temperature of minus 50 ℃ to minus 30 ℃ and is cold pressed into the outer tube 11 made of low carbon steel, so that the inner tube 13 and the outer tube 11 form interference fit.
The flange 14 is welded to the outer tube 11 and is embedded in the wear sleeve 15.
In an embodiment of the invention, there is also provided a pumping device comprising a delivery tube for delivering a material, the delivery tube being as described in any of the embodiments above; alternatively, the delivery tube is made by the method of making a delivery tube as described in any of the embodiments above. By the arrangement, the pumping equipment provided by the embodiment can effectively improve the wear resistance and the impact resistance of the conveying pipe. The development of the beneficial effects is substantially similar to that of the delivery tube described above, and will not be described in detail herein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (15)
1. A delivery tube, comprising:
an outer tube;
the inner tube is sleeved in the outer tube, an elastic buffer layer is arranged between the outer tube and the inner tube, pore structures are distributed on at least the inner wall surface of the inner tube, and wear-resistant high polymer materials are filled in the pore structures.
2. The delivery tube of claim 1, wherein the inner tube is constructed as an integrally formed ceramic tube and the wear resistant polymeric material is compositely attached to the inner tube by a centrifugal casting process.
3. A delivery tube according to claim 1 or claim 2, wherein the porosity of the inner tube is greater than or equal to 50% and the pore structure is evenly distributed over the inner tube.
4. The delivery tube of claim 1, wherein the material of the resilient buffer layer comprises at least one of polyurethane, vulcanized rubber, and silicone rubber.
5. The conveying pipe according to claim 1, wherein the elastic buffer layer comprises the following components in parts by mass:
isocyanate-terminated prepolymer: 100 parts; diamine crosslinking agents or glycol crosslinking agents: 20-50 parts of a lubricant; or,
the elastic buffer layer comprises the following materials in parts by mass:
polymer polyol: 100 parts; small molecule chain extenders: 0-20 parts; diphenylmethane-4, 4' -diisocyanate: 10-50 parts.
6. The delivery tube of claim 1, wherein the abrasion resistant polymeric material comprises at least one of nylon, epoxy, phenolic modified epoxy, and unsaturated polyester.
7. The conveying pipe according to claim 1, wherein the wear-resistant high polymer material comprises the following components in parts by mass:
caprolactam: 100 parts; sodium hydroxide: 0.08-0.3 part; isocyanate: 0.1-0.4 part; toughening agent: 0-15 parts.
8. The delivery pipe according to claim 1, wherein the elastic buffer layer is compounded on the outer peripheral surface of the inner pipe, the inner pipe provided with the elastic buffer layer is arranged in the outer pipe through a cold pressing process, and the elastic buffer layer is in interference fit with the outer pipe.
9. A method of manufacturing a delivery tube, comprising:
filling wear-resistant high polymer materials into pore structures of an inner pipe, wherein the pore structures are at least distributed on the inner wall surface of the inner pipe;
compounding an elastic buffer material on the outer wall surface of the inner tube so as to form an elastic buffer layer on the outer wall surface of the inner tube;
the inner tube is sleeved inside the outer tube, and the outer tube and the inner tube are fixedly connected.
10. The method for manufacturing a conveying pipe according to claim 9, wherein the filling of the wear-resistant polymer material into the pore structure of the inner pipe comprises:
heating the inner tube to a first preset temperature;
and placing the heated inner tube into a centrifugal casting mold, and filling the wear-resistant polymer material into the pore structure of the inner tube through a centrifugal casting process.
11. The method of manufacturing a delivery tube according to claim 9, wherein the compounding of the elastic buffer material on the outer wall surface of the inner tube comprises:
plugging the pipe orifice of the inner pipe;
placing the inner pipe with the pipe orifice plugged into a casting mold, and casting an elastic buffer material on the outer wall surface of the inner pipe through a casting process;
placing the casting mold and the inner tube into an oven together for heat drying treatment;
demolding the inner tube subjected to the heat drying treatment;
and (3) putting the demolded inner tube into an oven, and curing the elastic buffer material on the outer wall surface of the inner tube.
12. The method of manufacturing a delivery tube according to claim 11, wherein the sleeving the inner tube inside the outer tube and fixedly connecting the outer tube and the inner tube comprises:
performing low-temperature cooling treatment on the inner tube with the elastic buffer material compounded on the outer wall surface so as to enable the elastic buffer material to shrink;
sleeving the inner tube after the elastic buffer material is contracted into the outer tube;
the outer tube and the inner tube which are sleeved together are placed in a normal temperature environment, so that the elastic buffer material is expanded, and interference fit of the outer tube and the inner tube is further realized.
13. The method for manufacturing a conveying pipe according to claim 9, wherein the filling of the wear-resistant polymer material into the pore structure of the inner pipe comprises:
preparing a wear-resistant high polymer material;
adding a wear-resistant polymer material into a centrifugal casting mold, and filling the wear-resistant polymer material into the pore structure of the inner pipe through a centrifugal casting process; wherein,
the preparation of the wear-resistant polymer material comprises the following steps:
adding 100 parts of caprolactam and 0-15 parts of toughening agent into a reaction kettle for heating to melt the caprolactam and the toughening agent;
carrying out vacuum dehydration treatment on caprolactam and a toughening agent in a molten state in a reaction kettle;
adding 0.08-0.3 part of sodium hydroxide into the reaction kettle, and then continuing vacuum dehydration treatment;
adding 0.1-0.4 part of isocyanate into the reaction kettle to form the wear-resistant high polymer material.
14. The method of manufacturing a delivery tube according to claim 9, wherein the compounding of the elastic buffer material on the outer wall surface of the inner tube comprises:
preparing an elastic buffer material;
adding the prepared elastic buffer material into a casting mold, and casting the elastic buffer material on the outer wall surface of the inner pipe through a casting process; wherein,
the preparation of the elastic buffer material comprises the following steps:
adding 100 parts by mass of isocyanate end-capped prepolymer into a reaction kettle, heating, and carrying out vacuum defoaming treatment;
adding 20-50 parts of diamine cross-linking agent or glycol cross-linking agent in a molten state into a reaction kettle, and stirring and vacuum defoaming to form the elastic buffer material; or,
the preparation of the elastic buffer material comprises the following steps:
adding 100 parts by mass of polymer polyol and 0-20 parts by mass of small molecular chain extender into a reaction kettle for heating, and carrying out vacuum defoaming treatment;
10-50 parts of diphenylmethane-4, 4' -diisocyanate in a molten state are added into a reaction kettle, and stirring and vacuum defoaming treatment are carried out to form the elastic buffer material.
15. A pumping apparatus comprising a conveying pipe for conveying material, the conveying pipe being as claimed in any one of claims 1 to 8; alternatively, the delivery tube is manufactured by a method of manufacturing a delivery tube according to any one of claims 9-14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210995453.7A CN117624882A (en) | 2022-08-18 | 2022-08-18 | Conveying pipe, manufacturing method of conveying pipe and pumping equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210995453.7A CN117624882A (en) | 2022-08-18 | 2022-08-18 | Conveying pipe, manufacturing method of conveying pipe and pumping equipment |
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| CN117624882A true CN117624882A (en) | 2024-03-01 |
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| CN202210995453.7A Pending CN117624882A (en) | 2022-08-18 | 2022-08-18 | Conveying pipe, manufacturing method of conveying pipe and pumping equipment |
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| Country | Link |
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| CN (1) | CN117624882A (en) |
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