CN114811241A - Bent pipe, bent pipe casting method, concrete conveying pipe assembly and operation machine - Google Patents

Bent pipe, bent pipe casting method, concrete conveying pipe assembly and operation machine Download PDF

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Publication number
CN114811241A
CN114811241A CN202210531424.5A CN202210531424A CN114811241A CN 114811241 A CN114811241 A CN 114811241A CN 202210531424 A CN202210531424 A CN 202210531424A CN 114811241 A CN114811241 A CN 114811241A
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CN
China
Prior art keywords
elbow
wear
molten metal
bent pipe
resistant
Prior art date
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Pending
Application number
CN202210531424.5A
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Chinese (zh)
Inventor
王龙
张帆
徐乐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Sany Zhongyang Machinery Co Ltd
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Hunan Sany Zhongyang Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan Sany Zhongyang Machinery Co Ltd filed Critical Hunan Sany Zhongyang Machinery Co Ltd
Priority to CN202210531424.5A priority Critical patent/CN114811241A/en
Publication of CN114811241A publication Critical patent/CN114811241A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L43/00—Bends; Siphons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/08—Shaking, vibrating, or turning of moulds
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/085—Cooling or quenching
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Abstract

The invention provides a bent pipe, a bent pipe casting method, a concrete conveying pipe assembly and an operation machine, wherein the bent pipe comprises a bent pipe body, the bent pipe body is provided with a base body part and a wear-resistant part, the base body part extends along an arc line, the wear-resistant part is positioned on one side of the base body part, which is far away from the arc center of the arc line, and the base body part and the wear-resistant part are jointed to form an integrated structure. According to the wear-resistant elbow, a large number of research statistics are conducted on the wear condition of the elbow in the prior art in the using process, and the outer convex part of the elbow body is found to be the main part bearing wear.

Description

Bent pipe, bent pipe casting method, concrete conveying pipe assembly and operation machine
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a bent pipe, a bent pipe casting method, a concrete conveying pipe assembly and operation machinery.
Background
The concrete conveying pipe is a key accessory of the concrete pump truck, wherein the bent pipe part on the concrete conveying pipe needs to bear the abrasion of concrete gravel and sand aggregate and becomes a vulnerable part of the concrete pump truck.
The elbow pipe in the prior art mainly adopts high-chromium cast iron material to process and manufacture the elbow pipe, so that the elbow pipe has excellent wear resistance, but in the actual use process, not all wall surfaces of the elbow pipe need to bear wear, the whole wall surface of the elbow pipe is set to be made of the high-chromium cast iron material, the cost redundancy exists, and the improvement of the cost performance of the elbow pipe is not facilitated.
Therefore, how to solve the problem of high cost of the elbow in the prior art becomes an important technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
The invention provides a bent pipe, a bent pipe casting method, a concrete conveying pipe assembly and an operation machine, which are used for solving the defect of high cost of the bent pipe in the prior art.
The invention provides a bent pipe, which comprises a bent pipe body, wherein the bent pipe body is provided with a base body part and a wear-resisting part, the base body part extends along an arc line, the wear-resisting part is positioned on one side of the base body part, which is far away from the arc center of the arc line, and the base body part and the wear-resisting part are jointed to form an integrated structure.
According to the elbow pipe provided by the invention, the base body part and the wear-resistant part are integrally cast and formed.
According to the elbow provided by the invention, the joint surface of the base part and the wear-resisting part is a plane, the joint surface is perpendicular to the plane of the elbow body, the arc line is an arc, the joint surface is parallel to the longest chord of the elbow body, and the joint surface is positioned on the side of the longest chord of the elbow body away from the arc center of the arc line.
According to the elbow pipe provided by the invention, the wall thickness of the wear-resistant part is larger than that of the base part.
According to the elbow pipe provided by the invention, the wear-resistant part is made of high-chromium cast iron or high-alloy steel, and the base body part is made of cast steel or high-manganese steel.
The invention also provides a casting method of the elbow, wherein the elbow is the elbow, and the casting method of the elbow comprises the following steps:
pouring a first molten metal into a cavity of the casting mold;
before the first molten metal is solidified, pouring second molten metal into a cavity of the casting mold, wherein the second molten metal is a wear-resistant material;
and demolding after the first molten metal and the second molten metal are solidified and formed.
According to the casting method of the elbow provided by the invention, the method further comprises the following steps:
and carrying out heat treatment on the bent pipe after demoulding.
According to the casting method of the elbow provided by the invention, the method further comprises the following steps:
vibrating the casting mold after the pouring of the second molten metal is completed.
The invention also provides a concrete conveying pipe assembly which comprises the bent pipe.
The invention also provides a working machine which comprises the bent pipe or the concrete conveying pipe component.
The elbow provided by the invention comprises an elbow body, wherein the elbow body is provided with a base body part and a wear-resisting part, the base body part extends along an arc line, the wear-resisting part is made of a wear-resisting material, the wear-resisting part is positioned on one side of the base body part, which is far away from the arc center of the arc line, and the base body part and the wear-resisting part are jointed to form an integrated structure. According to the wear-resistant elbow, a large number of research statistics are conducted on the wear condition of the elbow in the prior art in the using process, and the outer convex part of the elbow body is found to be the main part bearing wear.
Further, the present invention provides a method for casting a bent pipe, which is used for machining the bent pipe as described above, and thus has various advantages as described above.
Further, the concrete conveying pipe assembly provided by the invention also has various advantages as described above due to the bent pipe as described above.
Further, the present invention provides a working machine having the bent pipe or the concrete feeding pipe assembly as described above, and therefore, having various advantages as described above.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic view of the external structure of the elbow pipe provided by the present invention;
FIG. 2 is a cross-sectional view of an elbow provided by the present invention;
FIG. 3 is a schematic structural view of a base portion provided by the present invention;
fig. 4 is a schematic structural view of a wear-resistant portion provided by the present invention.
Reference numerals:
1: a base portion; 2: a wear-resistant portion; 3: a bonding surface; 4: the longest chord of the elbow body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An elbow pipe according to an embodiment of the present invention will be described below with reference to fig. 1 to 4.
As shown in fig. 1 to 4, an embodiment of the invention provides an elbow pipe, which includes an elbow pipe body, the elbow pipe body includes a base portion 1 and a wear-resistant portion 2, the base portion 1 extends along an arc, the wear-resistant portion 2 is made of a wear-resistant material, the wear-resistant portion 2 is located on a side of the base portion 1 away from an arc center of the arc, and the base portion 1 and the wear-resistant portion 2 are joined to form an integrated structure.
According to the wear-resistant elbow, a large number of research statistics are conducted on the wear condition of the elbow in the prior art in the using process, and the outer protruding part of the elbow body is found to be the main part bearing wear, the wear-resistant part 2 in the wear-resistant elbow is the outer protruding part of the elbow body, the wear-resistant part 2 is made of wear-resistant materials, the wear-resistant part has excellent wear resistance, the wear amount can be effectively reduced, the wear-resistant part 2 made of the wear-resistant materials is only located at the outer protruding part of the elbow body, the using amount of the wear-resistant materials is reduced, the production cost of the elbow is reduced, and the cost performance of the elbow is improved.
In the embodiment of the present invention, the arc line is arc-shaped, that is, the elbow body is arc-shaped, and the inner edge of the base portion 1 is arc-shaped. The joint surface 3 between the base body 1 and the wear-resistant part 2 is a plane, perpendicular to the plane of the elbow body, and parallel to the corresponding chord at the two ends of the base body 1. With this arrangement, the wear-resistant portion 2 is located in the middle of the convex side of the elbow body, and can bear major wear, thereby ensuring wear resistance of the elbow.
In a further embodiment, the engagement surface 3 is located on the side of the longest chord 4 of the elbow body away from the arc center, as shown in FIG. 2. The axial section of the elbow body is two arcs which are concentrically arranged, the straight lines where the two ends of the outer arc are located are the longest chord of the outer arc, and the longest chord is the longest chord 4 of the elbow body. The joint surface 3 between the base part 1 and the wear-resistant part 2 is positioned on one side of the longest chord far away from the arc center of the arc line, so that the use of wear-resistant materials at positions outside a wear area is reduced as much as possible on the premise of ensuring the wear-resistant performance of the convex part of the elbow body, the use amount of the wear-resistant materials is reduced as much as possible, and the production cost of the elbow is reduced.
In the embodiment of the present invention, the base body portion 1 and the wear-resistant portion 2 are integrally cast, which is beneficial to ensuring the connection strength and the sealing property between the base body portion 1 and the wear-resistant portion 2 and improving the stability of the bent pipe.
The wear-resistant part 2 is made of high-chromium cast iron or high-alloy steel, such as Cr26 high-chromium cast iron or Cr30 high-chromium cast iron, and has the advantages of excellent wear resistance, high hardness and the like.
The base body 1 is made of high manganese steel or cast steel, for example, cast steel ZG310-570, high manganese steel ZGMn13 or ZG25MnCrNiMo, has excellent toughness, is not easily cracked, is impact-resistant, and is relatively low in cost compared with the wear-resistant portion 2.
Specifically, the processing may be performed using a casting mold. The inside of return bend casting mould has the die cavity, and the runner is located the top of die cavity and communicates with the die cavity, and the die cavity of casting mould also extends along the pitch arc, and the die cavity of casting mould is located same horizontal plane at the ascending both ends of extending direction, and the pitch arc center that the die cavity of casting mould corresponds is located one side of the below of die cavity.
The position in the cavity of the casting mould corresponding to the horizontal plane of the longest chord 4 of the elbow body or the position slightly higher than the horizontal plane of the longest chord 4 of the elbow body is the target position.
High manganese steel liquid can be poured into the cavity to a target position through a pouring gate; then pouring high-chromium cast iron liquid into the cavity until the cavity is full. And demolding after the high manganese steel liquid and the high chromium cast iron liquid are solidified, and then carrying out heat treatment according to specific materials.
In a preferred embodiment, the wall thickness of the wear-resistant part 2 can be made larger than that of the base part 1, so that the whole elbow can form an eccentric and unequal-wall-thickness structure, the wear resistance of the wear-resistant part 2 is increased, and the service life of the elbow can be prolonged.
In another aspect, the present invention further provides a casting method for machining the bent pipe provided in any of the above embodiments. The elbow casting method described below and the elbow described above may be referred to with respect to each other.
In the elbow casting method provided by the embodiment of the invention, the gate of the casting mold is positioned above the cavity of the casting mold, the cavity of the casting mold also extends along an arc, two ends of the cavity of the casting mold in the extending direction are positioned in the same horizontal plane, and the arc center corresponding to the cavity of the casting mold is positioned below the cavity of the casting mold.
The casting method of the bent pipe in the embodiment of the invention comprises the following steps:
step 110, pouring a first molten metal into a cavity of a casting mold.
And 120, pouring a second molten metal into the cavity of the casting mold before the first molten metal is solidified, wherein the second molten metal is made of a wear-resistant material.
And step 130, demolding after the first molten metal and the second molten metal are solidified and formed, and obtaining the bent pipe.
Specifically, molten metals of two materials are poured into the casting mold in sequence, and after the first molten metal is poured, the second molten metal is poured into the casting mold, so that the two molten metals are solidified simultaneously to form a whole. And (4) solidifying the first molten metal and the second molten metal, and then demolding to obtain the bent pipe.
The first molten metal forms the base part 1, the second molten metal forms the wear-resistant part 2, and the wear-resistant part 2 is only positioned at the convex part of the bent pipe, so that the using amount of wear-resistant materials is reduced, the production cost of the bent pipe is reduced, and the cost performance of the bent pipe is improved.
The derivation process of the beneficial effect of the bent pipe casting method in the embodiment of the present invention is substantially similar to the derivation process of the beneficial effect of the bent pipe, and therefore, details are not repeated here.
The second molten metal may be poured before the first molten metal is solidified, specifically, the second molten metal may be poured immediately after the first molten metal is poured, and the bonding quality between the base portion 1 and the wear-resistant portion 2 may be improved by utilizing the fluidity of the molten metal and the diffusion between the two metal atoms.
In the embodiment of the invention, the casting mould is arranged on the vibration platform, and after the pouring of the second molten metal is finished, the vibration platform is utilized to vibrate the casting mould so as to improve the fluidity of the second molten metal and further improve the joint quality of the joint surface of the first molten metal and the second molten metal.
In addition, the vibration of the vibration platform can also remove gas in the first metal liquid and the second metal liquid, refine crystal grains, reduce the crack tendency of the bent pipe, and increase the compactness, the mechanical property and the metallographic grade of the bent pipe.
The method of casting a bent pipe according to an embodiment of the present invention further includes heat-treating the bent pipe after the demolding. And demolding after the first molten metal and the second molten metal are solidified, and determining a heat treatment mode according to the components of the first molten metal and the second molten metal.
The heat treatment mode comprises quenching, tempering or water toughening treatment.
In some embodiments, high manganese steel liquid is prepared according to the components and process requirements of high manganese steel, wherein the mass percent of carbon is 1.5%, the mass percent of silicon is 1.5%, the mass percent of manganese is 15%, the mass percent of chromium is 2%, and the balance is iron. 8 kg of the raw materials are smelted according to the proportion and poured into a cavity of a casting mold.
And preparing high-chromium cast iron liquid according to the components and process requirements of the high-chromium cast iron, wherein the mass percent of carbon element is 3.5%, the mass percent of silicon element is 1.0%, the mass percent of manganese element is 1.0%, the mass percent of chromium element is 30%, the mass percent of molybdenum element is 1.5%, and the balance is iron element. 2 kg of the raw materials are smelted according to the proportion and poured into a cavity of a casting mold.
After the pouring of the two metal liquids is completed, the vibration platform is opened, the frequency is set to be 50Hz, and the amplitude is set to be 3 mm. Under the action of vibration, the fluidity of molten metal can be improved, and the joint quality of the joint surface of the two molten metals can be improved.
And demolding after the molten metal is solidified. And integrally heating the bent pipe to 900 ℃, preserving heat for 5 hours, and then quenching at the oil temperature of 150 ℃. The metallographic structure of the material can be changed by the integral heat treatment, and the hardness and the wear resistance of the material are improved. Meanwhile, the temperature is maintained at 900 ℃ during quenching, so that the mutual diffusion of the two metal liquids at the joint surface is promoted, and the joint effect of the joint surface is improved.
After quenching, tempering treatment can be carried out according to requirements so as to further improve the mechanical property of the bent pipe.
After the completion of the processing, the properties of the bent pipe were measured, and it was found that the Rockwell hardness of the base portion 1 was 25HRC and the impact toughness was 25J/cm 2 The 4-minute abrasive wear was 100mg, the Rockwell hardness of the wear-resistant portion 2 was 63HRC, and the impact toughness was 3J/cm 2 The 4 minute abrasive wear was 15 mg.
The mass of the second molten metal used by the wear-resistant part 2 only accounts for 20% of the whole mass of the elbow, but the hardness and the wear resistance of the wear-resistant part 2 are improved by more than 3 times, and the cost performance of the elbow is greatly improved.
In another embodiment, the high manganese steel liquid is prepared according to the components and the process requirements of the high manganese steel, wherein the mass percent of the carbon element is 1.0 percent, the mass percent of the manganese element is 12 percent, and the balance is the iron element or the trace impurity element. Smelting 14 kg according to the proportion, and pouring into a cavity of a casting mold.
And preparing high-chromium cast iron liquid according to the components and process requirements of the high-chromium cast iron, wherein the mass percent of carbon element is 2.5%, the mass percent of silicon element is 0.80%, the mass percent of manganese element is 1.0%, the mass percent of chromium element is 24%, the mass percent of molybdenum element is 0.6%, and the balance is iron element. 6 kg of the raw materials are smelted according to the proportion and poured into a cavity of a casting mold.
After the pouring of the two metal liquids is completed, the vibration platform is opened, the frequency is set to be 100Hz, and the amplitude is set to be 5 mm. Under the action of vibration, the fluidity of molten metal can be improved, and the joint quality of the joint surface of the two molten metals can be improved.
And after the molten metal is solidified and before the bent pipe is cooled, controlling the temperature of the mold to be 1020 ℃, demolding at the temperature, taking out the bent pipe, and then performing water quenching. The process omits the secondary heating and heat preservation of the bent pipe, directly utilizes the temperature of the waste heat of pouring to carry out heat treatment, can improve the production efficiency, and has low cost and obvious economic benefit.
After the completion of the processing, the properties of the bent pipe were tested, and it was found that the Rockwell hardness of the base portion 1 was 18HRC and the impact toughness was 40J/cm 2 Abrasive grain wear at 4 minutes was 160mg, Rockwell hardness of the wear-resistant portion 2 was 50HRC, and impact toughness was 5J/cm 2 The 4 minute abrasive wear was 26 mg.
The mass of the second molten metal used by the wear-resistant part 2 only accounts for 30% of the whole mass of the elbow, but the hardness and the wear resistance of the wear-resistant part 2 are improved by 2-3 times, and the cost performance of the elbow is greatly improved.
Through specific implementation verification, in the bent pipe provided by the invention, the mass of the wear-resistant part 2 is 10% -50% of the whole mass of the bent pipe. Specifically, the mass of the wear resistant portion 2 is 20% or 30% of the entire mass of the bent pipe.
During pouring, in order to facilitate control of the pouring liquid level of the first molten metal, the proportion and the respective mass of the first molten metal and the second molten metal can be determined before pouring, the first molten metal with corresponding mass is completely poured into a cavity of a casting mold during pouring, and then the cavity of the casting mold is filled with the second molten metal.
In yet another aspect, the present invention also provides a concrete conveying pipe assembly including an elbow as provided in any of the above embodiments. The bent pipe in the embodiment only adopts the wear-resistant material at the convex part, so that the production cost is low and the cost performance is high. Therefore, the concrete conveying pipe assembly in the embodiment of the invention has the advantages of low production cost and high cost performance. The derivation process of the beneficial effects of the concrete conveying pipe assembly in the embodiment of the invention is substantially similar to the derivation process of the beneficial effects of the bent pipe, and therefore, the details are not repeated here.
In yet another aspect, the present disclosure provides a work machine including an elbow or concrete pipe assembly according to any of the embodiments described above. Having all the advantages of the above-described bent pipe or concrete pipe assembly, will not be described in detail herein. The derivation process of the beneficial effects of the working machine in the embodiment of the present invention is substantially similar to the derivation process of the beneficial effects of the bent pipe or the concrete conveying pipe assembly, and therefore, the details are not repeated herein.
The working machine in this embodiment may be, but is not limited to, a concrete pump truck, a vehicle-mounted pump, a trailer pump, or the like.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A elbow including a elbow body having a base portion extending along an arc and a wear portion on a side of the base portion away from the arc center, the base portion and the wear portion being joined to form a unitary structure.
2. The elbow according to claim 1, wherein the base portion is cast integrally with the wear portion.
3. The elbow according to claim 1, wherein the engagement surface of the base portion and the wear portion is planar, the engagement surface is perpendicular to a plane of the elbow body, the arc is a circular arc, the engagement surface is parallel to a longest chord of the elbow body, and the engagement surface is on a side of the longest chord of the elbow body away from a center of the arc.
4. The elbow according to claim 1, wherein the wear portion has a wall thickness greater than a wall thickness of the base portion.
5. The elbow according to claim 1, wherein the wear resistant portion is made of high chromium cast iron or high alloy steel, and the base portion is made of cast steel or high manganese steel.
6. A method of casting an elbow pipe according to any one of claims 1 to 5, comprising:
pouring a first molten metal into a cavity of the casting mold;
before the first molten metal is solidified, pouring second molten metal into a cavity of the casting mold, wherein the second molten metal is a wear-resistant material;
and demolding after the first molten metal and the second molten metal are solidified and formed.
7. The elbow casting method according to claim 6, further comprising:
and carrying out heat treatment on the bent pipe after demoulding.
8. The elbow casting method according to claim 6, further comprising:
vibrating the casting mold after the pouring of the second molten metal is completed.
9. A concrete transfer pipe assembly including an elbow as claimed in any one of claims 1 to 5.
10. A work machine comprising an elbow according to any of claims 1 to 5, or a concrete pipe assembly according to claim 9.
CN202210531424.5A 2022-05-16 2022-05-16 Bent pipe, bent pipe casting method, concrete conveying pipe assembly and operation machine Pending CN114811241A (en)

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CN202210531424.5A CN114811241A (en) 2022-05-16 2022-05-16 Bent pipe, bent pipe casting method, concrete conveying pipe assembly and operation machine

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010046838A (en) * 1999-11-16 2001-06-15 이구택 Method for mounting hi-mn casting on the elbow of dust collecting duct
KR200272385Y1 (en) * 2001-11-30 2002-04-17 이기철 Elbow-pipe containing reinforcement
CN102506237A (en) * 2011-11-01 2012-06-20 三一重工股份有限公司 Concrete conveying pipe and manufacturing method thereof
CN202327472U (en) * 2011-11-22 2012-07-11 中联重科股份有限公司 Concrete conveying elbow pipe and concrete pumping equipment
CN202343918U (en) * 2011-12-08 2012-07-25 洛阳市致力实业有限公司 Wear-resisting composite casting device with double-liquid bimetal bonding interface
CN203868577U (en) * 2013-04-28 2014-10-08 尹邦进 Wear-resistant elbow for conveying concrete
CN105798273A (en) * 2016-04-22 2016-07-27 湖南湖大三佳车辆技术装备有限公司 Double-liquid compound casting method
CN106764203A (en) * 2017-02-21 2017-05-31 无锡康克瑞管业科技有限公司 Concrete conveyance double-layer wear-resistant bend pipe
CN108591659A (en) * 2018-04-24 2018-09-28 沂源旭光机械有限公司 A kind of automobile-used inset type high abrasion composite integrated end bend pipe of concrete pump
KR20190108931A (en) * 2018-03-16 2019-09-25 백동기 Elbow assembly for concrete pump car
CN211599875U (en) * 2020-01-07 2020-09-29 长沙砼辉新材料有限公司 Concrete conveying elbow pipe
CN212361199U (en) * 2020-06-09 2021-01-15 江苏英特耐机械制造有限公司 Novel elbow structure convenient to change

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010046838A (en) * 1999-11-16 2001-06-15 이구택 Method for mounting hi-mn casting on the elbow of dust collecting duct
KR200272385Y1 (en) * 2001-11-30 2002-04-17 이기철 Elbow-pipe containing reinforcement
CN102506237A (en) * 2011-11-01 2012-06-20 三一重工股份有限公司 Concrete conveying pipe and manufacturing method thereof
CN202327472U (en) * 2011-11-22 2012-07-11 中联重科股份有限公司 Concrete conveying elbow pipe and concrete pumping equipment
CN202343918U (en) * 2011-12-08 2012-07-25 洛阳市致力实业有限公司 Wear-resisting composite casting device with double-liquid bimetal bonding interface
CN203868577U (en) * 2013-04-28 2014-10-08 尹邦进 Wear-resistant elbow for conveying concrete
CN105798273A (en) * 2016-04-22 2016-07-27 湖南湖大三佳车辆技术装备有限公司 Double-liquid compound casting method
CN106764203A (en) * 2017-02-21 2017-05-31 无锡康克瑞管业科技有限公司 Concrete conveyance double-layer wear-resistant bend pipe
KR20190108931A (en) * 2018-03-16 2019-09-25 백동기 Elbow assembly for concrete pump car
CN108591659A (en) * 2018-04-24 2018-09-28 沂源旭光机械有限公司 A kind of automobile-used inset type high abrasion composite integrated end bend pipe of concrete pump
CN211599875U (en) * 2020-01-07 2020-09-29 长沙砼辉新材料有限公司 Concrete conveying elbow pipe
CN212361199U (en) * 2020-06-09 2021-01-15 江苏英特耐机械制造有限公司 Novel elbow structure convenient to change

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