CN104209712A - Concrete conveying pipe, manufacturing method thereof and concrete pump truck - Google Patents
Concrete conveying pipe, manufacturing method thereof and concrete pump truck Download PDFInfo
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- CN104209712A CN104209712A CN201410497523.1A CN201410497523A CN104209712A CN 104209712 A CN104209712 A CN 104209712A CN 201410497523 A CN201410497523 A CN 201410497523A CN 104209712 A CN104209712 A CN 104209712A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000010410 layer Substances 0.000 claims abstract description 156
- 238000003466 welding Methods 0.000 claims abstract description 81
- 239000002356 single layer Substances 0.000 claims abstract description 74
- 238000010791 quenching Methods 0.000 claims abstract description 51
- 230000000171 quenching effect Effects 0.000 claims abstract description 48
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract description 10
- 239000010962 carbon steel Substances 0.000 claims abstract description 9
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 20
- 210000001503 joint Anatomy 0.000 claims description 6
- 239000000463 material Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 230000002035 prolonged effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000004927 fusion Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/154—Making multi-wall tubes
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- 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
- C21D9/085—Cooling or quenching
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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
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
- F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
- F16L23/026—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes by welding
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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
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention provides a concrete conveying pipe, a manufacturing method thereof and a concrete pump truck. The manufacturing method of the concrete conveying pipe comprises the following steps: blanking: cutting a single-layer pipe and a double-layer pipe with preset lengths, wherein the single-layer pipe is a quenchable pipe, an inner pipe layer of the double-layer pipe is a quenchable layer, and an outer pipe layer of the double-layer pipe is a carbon steel layer; welding the single-layer pipe and the double-layer pipe: welding the single-layer pipe and the double-layer pipe into an integral pipe by butt welding, wherein at least one end of the integral pipe is the double-layer pipe; quenching: and carrying out quenching treatment on the inner wall of the integrated pipe. The concrete conveying pipe with long service life and high stability can be manufactured by the manufacturing method of the concrete conveying pipe.
Description
Technical Field
The invention relates to the technical field of concrete transportation equipment, in particular to a concrete conveying pipe, a manufacturing method thereof and a concrete pump truck.
Background
Due to the severe working environment of the concrete conveying pipe, the concrete conveying pipe has to have better wear resistance and meet certain pressure requirements. The selection of materials, reasonable process and the design of pipe fitting structure become three main factors influencing the service life of the concrete conveying pipe. The effect of prolonging the service life is achieved by quenching the inner wall of alloy steel to improve the hardness.
In the prior art, the straight pipe part of the concrete pump truck can be divided into two categories of a single-layer straight pipe and a double-layer straight pipe from the structural point of view:
fig. 1 shows a structure of a single-layer straight pipe in which an inner wall is hardened to a certain depth and an outer layer is not hardened to a certain thickness, thereby maintaining wear resistance of the inner wall and pressure-bearing capacity. The single-layer concrete conveying straight pipe consists of three parts, namely a flange 1, a wear-resistant sleeve 2 and a pipe body 3, wherein the wear-resistant sleeve 2 is made of a material with good wear resistance, such as high-chromium cast iron; however, the pipe body 3 must meet three functional requirements of wear resistance, pressure bearing and welding connection. The existing single-layer straight pipe process comprises the following steps: the wear resistance is realized by a pipe body quenching process, the pressure bearing requirement is ensured by controlling the depth of a quenching layer, the welding performance is determined by the material, and the performances of a welding area and a quenching area are influenced mutually and are often considered and difficult to control. Therefore, the single-layer straight pipe has narrow material selection range, and the service life is difficult to achieve although the cost is relatively low.
The double-layer straight pipe has different materials of the inner layer and the outer layer, the outer layer is made of a non-hardening material, and the inner layer is hardened completely. The existing double-layer straight pipe process comprises the following steps: quenching, pipe cutting and flange welding (pre-pressed sleeve) are carried out, and the cost is high.
Referring to fig. 2, a cross-sectional view of the fully fused zone 4, the weld heat affected zone 5, and the quench layer 6 of a single layer straight tube welded to the upper flange 1 is shown in fig. 2. According to the prior art, in the process of welding the flange on the single-layer pipe, the heat affected zone 5 of welding (fillet welding) can change the structure of the pipe, and the specific influence is that the heat affected zone 5 is difficult to quench, so that the depth of a quenching layer 6 at the welding part is insufficient; if the quenching power is increased intentionally, the depth of a quenching layer at a welding part is difficult to control, and if the quenching layer is too deep, the welding part is easy to break, thereby seriously affecting the stability of the performance of the pipe fitting. Thus, the stability of the performance (no fracture at the weld) must be traded for reduced pipe life (reduced quench depth). Under normal conditions, a single-layer straight pipe cannot reach a longer service life. And the double-layer straight pipe has high cost and small market share.
Disclosure of Invention
The invention aims to provide a concrete conveying pipe, a manufacturing method thereof and a concrete pump truck, and aims to solve the problems that the concrete conveying pipe in the prior art is high in cost and short in service life.
In order to solve the above technical problem, according to an aspect of the present invention, there is provided a method for manufacturing a concrete pipe, including: blanking: cutting a single-layer pipe and a double-layer pipe with preset lengths, wherein the single-layer pipe is a quenchable pipe, an inner pipe layer of the double-layer pipe is a quenchable layer, and an outer pipe layer of the double-layer pipe is a carbon steel layer; welding the single-layer pipe and the double-layer pipe: welding the single-layer pipe and the double-layer pipe into an integral pipe by butt welding, wherein at least one end of the integral pipe is the double-layer pipe; quenching: and carrying out quenching treatment on the inner wall of the integrated pipe.
Further, in the blanking step, the perpendicularity between the end face of the single-layer pipe and the axis of the single-layer pipe is not more than +/-0.5, and the perpendicularity between the end face of the double-layer pipe and the axis of the double-layer pipe is not more than +/-0.5.
Further, the inner wall of the integrated pipe is provided with an annular gap at the welding position of the single-layer pipe and the double-layer pipe.
Further, the method also comprises a flange welding step after the quenching step: welding the connecting flange at the end part of the integrated pipe by adopting fillet welding; the flange includes: the first flange is sleeved at the first end of the integrated pipe and welded on the integrated pipe; and the second flange is sleeved at the second end of the integrated pipe and is welded on the integrated pipe.
Further, the concrete pipe further includes: one of the two first wear-resistant sleeves is embedded in the through hole of the first flange and is in butt joint with the integrated pipe, and the other one of the two first wear-resistant sleeves is embedded in the through hole of the second flange and is in butt joint with the integrated pipe.
Further, the concrete pipe further includes: the second wear-resistant sleeve is embedded in the through hole of the first flange and is butted with the integrated pipe; wherein, integrative pipe includes a section double-layer pipe and a section single-layer pipe, and first flange is close to the double-layer pipe setting.
Further, the integrated pipe comprises two sections of double-layer pipes and a section of single-layer pipe, and the two sections of double-layer pipes are welded at the first end and the second end of the single-layer pipe respectively.
According to another aspect of the present invention, there is provided a concrete delivery pipe comprising: the single-layer pipe is a quenching pipe with an inner wall; the double-layer pipe comprises an inner pipe layer and an outer pipe layer, wherein the inner pipe layer is a quenching layer, and the outer pipe layer is a carbon steel layer; wherein the single-layer pipe and the double-layer pipe are connected through butt welding to form an integrated pipe.
Further, the concrete pipe further includes: the connecting flange is fixedly connected to the end part of the integrated pipe through a fillet weld;
the flange includes: the first flange is sleeved at the first end of the integrated pipe and welded on the integrated pipe; and the second flange is sleeved at the second end of the integrated pipe and is welded on the integrated pipe.
Further, the concrete pipe further includes: the integrated pipe comprises a section of double-layer pipe and a section of single-layer pipe, and the first flange is arranged close to the double-layer pipe.
According to still another aspect of the present invention, there is provided a concrete pump truck including the concrete delivery pipe described above.
By applying the technical scheme of the invention, firstly, a blanking step is carried out, in the blanking step, the single-layer pipe and the double-layer pipe are cut into preset lengths according to actual working condition requirements, and in order to enable the concrete conveying pipeline of the invention to meet the severe working condition requirements, the single-layer pipe of the invention is a quenchable pipe, such as an alloy steel pipe; similarly, the inner pipe layer of the double-layer pipe is a quenchable layer, and the outer pipe layer is a common carbon steel layer. Secondly, a single-layer pipe and a double-layer pipe are welded into an integral pipe by butt welding, compared with the fillet welding mode in the prior art, the butt welding in the invention has much less influence on the welding heat of the single-layer pipe, at least one end of the integral pipe is the double-layer pipe, and in the using process, the end part of the integral pipe with the double-layer pipe is arranged as a feed inlet of the concrete conveying pipe, so that the severe working condition requirement of the feed inlet of the concrete conveying pipe can be met, and the service life of the whole conveying pipe is prolonged. And thirdly, carrying out a quenching step, wherein the inner wall of the integrated pipe formed by welding the single-layer pipe and the double-layer pipe is quenched, after the quenching treatment, the double-layer pipe can be quenched to form a first quenching layer, the inner wall of the single-layer pipe can be quenched to form a second quenching layer, and the hardness of the first quenching layer is greater than that of the second quenching layer, so that the wear resistance of the integrated pipe can be improved, and the failure consistency of the whole pipe body can be ensured. Because the outer pipe layer of double-layer pipe is the carbon steel layer, for the material that can not harden, in welding process, even spout the coolant liquid at the inner wall of integrative pipe and prevent that the inner tube from being annealed, the welding seam between outer pipe and the flange also is difficult for producing cold crack, can not lead to the welding seam fracture, further improves the life of concrete conveying pipe. The single-layer pipe is affected by materials, if water spray cooling is carried out during fillet welding, the welding seam is hardened, the welding seam is easy to crack, potential safety hazards are generated, the abrasion resistance of the connecting end of the single-layer pipe and the flange can be affected, but the single-layer pipe is located at the outlet end of concrete and is not easy to abrade, and the whole service life of the pipe fitting cannot be affected.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 schematically illustrates a cross-sectional view of a prior art concrete delivery pipe;
FIG. 2 schematically illustrates an enlarged partial view of region P of FIG. 1;
FIG. 3 schematically illustrates a cross-sectional view of a concrete delivery pipe of the present invention; and
fig. 4 schematically shows a partial enlarged view of the region M of fig. 2.
Description of reference numerals: 10. a first flange; 20. a second flange; 30. a single layer tube; 40. a double-layer tube; 50. a first wear sleeve; 60. a complete fusion region; 70. a quenching layer; 80. welding the heat affected zone.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
Referring to fig. 3 and 4, a method of manufacturing a concrete pipe according to an embodiment of the present invention is provided. The method sequentially comprises a blanking step, a single-layer and double-layer pipe welding step, a quenching step and a flange welding step. Firstly, a blanking step is carried out, in the blanking step, the single-layer pipe 30 and the double-layer pipe 40 are cut into preset lengths according to actual working condition requirements, in order to enable the concrete conveying pipeline of the embodiment to meet the severe working condition requirements, the single-layer pipe 30 in the embodiment is a quenchable pipe, such as an alloy steel pipe; similarly, the inner tube layer of the double tube 40 is a quenchable layer, such as Q57, and the outer tube layer is a plain carbon steel layer, such as Q345B.
Secondly, a single-double tube welding step is performed, in which the single-layer tube 30 and the double-layer tube 40 are welded as an integral tube by means of butt welding, and it can be known through a large number of experimental verifications that: the butt welding of the present invention has a much smaller heat effect on the welding of the single-layer tube than the prior art fillet welding. At least one end of the integrated pipe is the double-layer pipe 40, in the using process, the end part of the integrated pipe with the double-layer pipe 40 is arranged as the feed inlet of the concrete conveying pipe, the severe working condition requirement of the feed inlet of the concrete conveying pipe can be met, and the service life of the whole conveying pipe is prolonged.
And thirdly, carrying out a quenching step, wherein the inner wall of the integrated pipe formed by welding the single-layer pipe 30 and the double-layer pipe 40 is quenched, after the quenching treatment, the double-layer pipe quenchable layer forms a first quenching layer, the inner wall of the single-layer quenchable pipe forms a second quenching layer, and the hardness of the first quenching layer is greater than that of the second quenching layer, so that the wear resistance of the integrated pipe can be improved, and the failure consistency of the whole pipe body can be ensured.
Fourthly, a flange welding step is carried out, in the flange welding step, the connecting flange is welded at the end part of the integrated pipe by fillet welding, in the process of welding the connecting flange and the integrated pipe together, the welding position of the connecting flange and the integrated pipe is positioned on the outer pipe layer of the double-layer pipe 40, and when the double-layer pipe 40 and the flange are subjected to fillet welding, water spraying cooling is carried out simultaneously, so that the hardness of the inner pipe layer of the double-layer pipe 40 is not influenced by welding. Because the outer pipe layer of the double-layer pipe 40 is the carbon steel layer and is a material which can not be hardened, even if cooling liquid is sprayed on the inner wall of the integrated pipe to prevent the inner pipe from being annealed in the welding process, the welding seam between the outer pipe and the flange is not easy to generate cold cracks, the welding seam can not be broken, and the service life of the concrete conveying pipe is further prolonged. The single-layer pipe is affected by materials, if water spray cooling is carried out during fillet welding, the welding seam is hardened, the welding seam is easy to crack, and potential safety hazards are generated. The end of the single-layer pipe connected with the flange is not cooled by water spray when being welded, the wear resistance of the welding seam is affected, but the end of the single-layer pipe at the outlet end of the concrete is not easy to wear, and the whole service life of the pipe fitting is not affected.
Referring to fig. 4, fig. 4 is a sectional view showing the complete fusion zone 4, the weld heat affected zone 5, and the quenching layer 6 at the butt welding position of the single-layer tube 30 and the double-layer tube 40 of the present embodiment. According to the method, because the welding reliability of the butt welding is superior to that of the fillet welding, the butt welding can be carried out by using smaller voltage and current and smaller weld joint height under the same strength condition, the single-layer pipe 30 and the double-layer pipe 40 are welded into an integral structure, the size of the welding heat affected zone 80 is reduced, the influence of the welding of the single-layer pipe 30 and the double-layer pipe 40 on the quenching is reduced, and the service life of the concrete conveying pipe is prolonged.
Since the depth of the quenching layer at the end of the pipe increases due to the concentration of heat at the end of the pipe, this effect is called "quenched end effect". In order to form the quenching end effect, the inner wall of the integrated pipe is provided with an annular gap at the welding position of the single-layer pipe 30 and the double-layer pipe 40, namely, the butt joint surface of the single-layer pipe 30 and the double-layer pipe 40 is not completely fused, and the quenching end effect can be generated in the quenching process, so that the insufficient depth of a quenching layer caused by welding the single-layer pipe 30 and the double-layer pipe 40 is made up, and the whole high concrete conveying pipe can meet the pressure-bearing requirement.
Preferably, in the blanking step, the perpendicularity between the end face of the single-layer pipe 30 and the axis of the single-layer pipe 30 is not more than +/-0.5, and the perpendicularity between the end face of the double-layer pipe 40 and the axis of the double-layer pipe 40 is not more than +/-0.5, so that the situation that the single-layer pipe 30 and the double-layer pipe 40 are bent in the welding process is avoided, and the stability of the concrete conveying pipe is ensured.
Referring to fig. 3 again, the connecting flange in this embodiment includes a first flange 10 and a second flange 20, wherein the first flange 10 is sleeved on a first end of the integrated pipe and is welded on the integrated pipe; the second flange 20 is sleeved at the second end of the integrated pipe and welded on the integrated pipe, so that the integrated pipe is conveniently connected to a concrete pump truck for transporting concrete.
In an embodiment of the present invention, in order to further prolong the service life of the concrete conveying pipe, the concrete conveying pipe of this embodiment further includes two first wear-resistant sleeves 50, one of the two first wear-resistant sleeves 50 is embedded in the through hole of the first flange 10 and is abutted with the integrated pipe, and the other is embedded in the through hole of the second flange 20 and is abutted with the integrated pipe. Through set up first wear-resisting cover 50 in the inside of first flange 10 and second flange 20, can avoid the first flange 10 of concrete friction and second flange 20, improve concrete conveying pipeline's life.
When in the use, can also set up integrative pipe into different structures to specific operating mode, under the harsher condition of operating mode, integrative pipe includes two sections double-layer tube 40 and one section monomial pipe 30, and two sections double-layer tube 40 weld respectively at the first end and the second end of monomial pipe 30, and at this moment, the flange welding is welded on double-layer tube 40, can further improve the wearability of concrete conveying pipe, guarantees the life of high concrete conveying pipe. In addition, in the embodiment, the connecting flange is welded on the double-layer pipe 40, so that the process of quenching before welding can be implemented at the flange, and the angle welding area of the connecting flange is not influenced by welding.
In order to reduce the production cost of the whole high concrete conveying pipe, in an embodiment of the present invention, which is not shown, the concrete conveying pipe further includes a second wear-resistant sleeve, the second wear-resistant sleeve is embedded in the through hole of the first flange 10 and is abutted to the integrated pipe, the first flange 10 is disposed at one end close to the double-layer pipe 40, during use, the end provided with the double-layer pipe 40 is used as the inlet end of the concrete, and the friction of the end is greater than that of the outlet end of the concrete, so that the end fails to be connected to the outlet end of the high concrete conveying pipe, and in order to save cost, the integrated pipe of the present embodiment includes a section of the double-layer pipe 40 and a section of the single-layer pipe 30, and the wear-resistant layer at the second end of the integrated pipe can be omitted. That is to say, the high concrete conveyer pipe of this embodiment can practice thrift the manufacturing cost of high concrete conveyer pipe when guaranteeing the life of high concrete conveyer pipe, and simple structure is convenient for realize.
According to another aspect of the present invention, a concrete conveying pipe is provided, and the concrete conveying pipe of this embodiment is manufactured by the above concrete conveying pipe manufacturing method. The concrete delivery pipe in this embodiment includes a single-layer pipe 30, a double-layer pipe 40, and a connection flange. Wherein the single-layer pipe 30 is a quenching pipe; the double-layer pipe 40 comprises an inner pipe layer and an outer pipe layer, the inner pipe layer is a quenching layer, the outer pipe layer is a carbon steel layer, and the single-layer pipe 30 and the double-layer pipe 40 form an integrated pipe through butt welding; the connecting flange is welded and fixed on the integrated pipe. In the use, the tip of double-deck pipe 40 sets up to the entrance point of concrete conveying pipe, can satisfy the more abominable operating mode demand of concrete feeding, improves the hardness that the whole conveyer pipe's life quenching pipe and quenching layer can improve the intergral pipe, can improve the wearability of intergral pipe. According to the invention, because the welding reliability of the butt weld is superior to that of the fillet weld, the butt weld can be formed by welding with smaller voltage, current and weld height under the same strength condition, and the size of a welding heat affected zone is reduced, thereby reducing the influence of the welding of the single-layer pipe 30 and the double-layer pipe 40 on quenching and prolonging the service life of the concrete conveying pipe.
The concrete conveying pipe in the embodiment further comprises a connecting flange, and the connecting flange is fixedly connected to the end part of the integrated pipe through a fillet weld. The connecting flange comprises a first flange 10 and a second flange 20, wherein the first flange 10 is sleeved at the first end of the integrated pipe and is welded on the integrated pipe; the second flange 20 is sleeved at the second end of the integrated pipe and welded on the integrated pipe, so that the integrated pipe is conveniently connected to a pump truck for transporting concrete.
In order to reduce the production cost of the whole high concrete conveying pipe, in an embodiment of the present invention, which is not shown, the concrete conveying pipe further includes a second wear-resistant sleeve, the second wear-resistant sleeve is embedded in the through hole of the first flange 10 and is abutted to the integrated pipe, the first flange 10 is disposed at one end close to the double-layer pipe 40, during use, the end provided with the double-layer pipe 40 is used as the inlet end of the concrete, and the friction is large, so that the integrated pipe fails to be connected to the outlet end of the high concrete conveying pipe first, and in order to save the cost, the integrated pipe of the present embodiment includes a section of the double-layer pipe 40 and a section of the single-layer pipe 30, and the wear-resistant layer at the second end of the integrated pipe can be omitted. That is to say, the high concrete conveyer pipe of this embodiment can practice thrift the manufacturing cost of high concrete conveyer pipe when guaranteeing the life of high concrete conveyer pipe, and simple structure is convenient for realize.
According to still another aspect of the present invention, there is provided a concrete pump truck including a concrete delivery pipe as described above.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A method for manufacturing a concrete conveying pipe is characterized by comprising the following steps:
blanking: cutting a single-layer pipe (30) and a double-layer pipe (40) with preset lengths, wherein the single-layer pipe (30) is a quenchable pipe, the inner pipe layer of the double-layer pipe (40) is a quenchable layer, and the outer pipe layer is a carbon steel layer;
welding the single-layer pipe and the double-layer pipe: welding the single-layer pipe (30) and the double-layer pipe (40) into an integrated pipe by butt welding, wherein at least one end of the integrated pipe is the double-layer pipe (40);
quenching: and carrying out quenching treatment on the inner wall of the integrated pipe.
2. The concrete conveying pipe manufacturing method according to claim 1, wherein in the blanking step, the perpendicularity of the end face of the single-layer pipe (30) and the axis of the single-layer pipe (30) is not more than ± 0.5, and the perpendicularity of the end face of the double-layer pipe (40) and the axis of the double-layer pipe (40) is not more than ± 0.5.
3. A method for making a concrete pipe according to claim 1, characterized in that the inner wall of said one-piece pipe has an annular gap at the welding position of said single-layer pipe (30) and said double-layer pipe (40).
4. A method of making a concrete pipe according to claim 1, further comprising a flange welding step after said quenching step: welding a connecting flange at the end part of the integrated pipe by adopting fillet welding;
the connection flange includes:
the first flange (10), the first flange (10) is sleeved on the first end of the integrated pipe and is welded on the integrated pipe;
and the second flange (20), the second flange (20) is sleeved at the second end of the integrated pipe and is welded on the integrated pipe.
5. The method of making a concrete delivery pipe according to claim 4, further comprising:
one of the two first wear-resistant sleeves (50) is embedded in the through hole of the first flange (10) and is in butt joint with the integrated pipe, and the other one of the two first wear-resistant sleeves (50) is embedded in the through hole of the second flange (20) and is in butt joint with the integrated pipe.
6. The method of making a concrete delivery pipe according to claim 4, further comprising:
the second wear-resistant sleeve is embedded in the through hole of the first flange (10) and is in butt joint with the integrated pipe; wherein,
the integrated pipe comprises a section of the double-layer pipe (40) and a section of the single-layer pipe (30), and the first flange (10) is arranged close to the double-layer pipe (40).
7. A method for making a concrete pipe according to claim 1, wherein said integral pipe comprises two sections of said double-layer pipe (40) and one section of said single-layer pipe (30), said two sections of double-layer pipe (40) being welded to a first end and a second end of said single-layer pipe (30), respectively.
8. A concrete delivery pipe, comprising:
the single-layer pipe (30), the single-layer pipe (30) is an inner wall quenching pipe;
the double-layer pipe (40) comprises an inner pipe layer and an outer pipe layer, wherein the inner pipe layer is a quenching layer, and the outer pipe layer is a carbon steel layer; wherein the single-layer pipe (30) and the double-layer pipe (40) are connected by a butt weld to form an integral pipe.
9. The concrete delivery pipe of claim 8, further comprising:
the connecting flange is fixedly connected to the end part of the integrated pipe through a fillet weld;
the connection flange includes:
the first flange (10), the first flange (10) is sleeved on the first end of the integrated pipe and is welded on the integrated pipe;
and the second flange (20), the second flange (20) is sleeved at the second end of the integrated pipe and is welded on the integrated pipe.
10. The concrete delivery pipe of claim 9, further comprising:
the integrated pipe comprises a section of the double-layer pipe (40) and a section of the single-layer pipe (30), and the first flange (10) is arranged close to the double-layer pipe (40).
11. A concrete pump truck comprising a concrete delivery pipe, characterized in that the concrete delivery pipe is the concrete delivery pipe of any one of claims 8 to 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410497523.1A CN104209712B (en) | 2014-09-24 | 2014-09-24 | Concrete conveying pipe, manufacturing method thereof and concrete pump truck |
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| CN201410497523.1A CN104209712B (en) | 2014-09-24 | 2014-09-24 | Concrete conveying pipe, manufacturing method thereof and concrete pump truck |
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| CN104209712B CN104209712B (en) | 2016-08-24 |
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| CN105234633A (en) * | 2015-10-21 | 2016-01-13 | 无锡阳工机械制造有限公司 | Pump pipe machining technology |
| CN110715117A (en) * | 2019-09-10 | 2020-01-21 | 中联重科股份有限公司 | Concrete conveying pipe and manufacturing method thereof |
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| CN201187642Y (en) * | 2008-04-15 | 2009-01-28 | 李先林 | Combined type abrasion-proof concrete conveying pipe |
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| CN1644715A (en) * | 2005-01-28 | 2005-07-27 | 三一重工股份有限公司 | Production of concrete transporting pipes and special quenching apparatus thereof |
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| CN110715117A (en) * | 2019-09-10 | 2020-01-21 | 中联重科股份有限公司 | Concrete conveying pipe and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104209712B (en) | 2016-08-24 |
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