CN115183077A - Material conveying equipment, concrete feeding pipe and manufacturing method thereof - Google Patents
Material conveying equipment, concrete feeding pipe and manufacturing method thereof Download PDFInfo
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- CN115183077A CN115183077A CN202210952716.6A CN202210952716A CN115183077A CN 115183077 A CN115183077 A CN 115183077A CN 202210952716 A CN202210952716 A CN 202210952716A CN 115183077 A CN115183077 A CN 115183077A
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- Prior art keywords
- pipe
- layer
- wear
- concrete
- tube
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- 239000004567 concrete Substances 0.000 title claims abstract description 78
- 239000000463 material Substances 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000010410 layer Substances 0.000 claims description 77
- 239000002245 particle Substances 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 10
- 238000005524 ceramic coating Methods 0.000 claims description 9
- 239000011651 chromium Substances 0.000 claims description 8
- 229910001018 Cast iron Inorganic materials 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 5
- 239000002356 single layer Substances 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 claims description 4
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 claims description 3
- 239000002923 metal particle Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L43/00—Bends; Siphons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention relates to the technical field of engineering equipment, in particular to material conveying equipment, a concrete feeding pipe and a manufacturing method of the concrete feeding pipe. The concrete feeding pipe comprises a pipe body and a wear-resistant layer. The inner wall surface of the pipe body is provided with a groove, the wear-resistant layer is arranged in the groove, and the surface of the wear-resistant layer facing the inner side of the pipe body is flush with the inner surface of the pipe body. According to the concrete feeding pipe provided by the invention, the wear-resistant layer is arranged on the inner wall of the pipe body, and the wear-resistant layer is limited on the inner wall of the pipe body through the groove, so that on one hand, the wear-resistant property of the wear-resistant layer can be utilized to improve the wear-resistant strength of the concrete feeding pipe; on the other hand, the recess can also be injectd the position of wearing layer, promotes the connection compactness between wearing layer and the body.
Description
Technical Field
The invention relates to the technical field of engineering equipment, in particular to material conveying equipment, a concrete feeding pipe and a manufacturing method thereof.
Background
When the material conveying equipment is used for conveying boring, a straight pipe or a bent pipe structure is needed. For example, the concrete pump used in a concrete pump truck uses a feeding pipe as one of the main wearing parts of the pumping system. At present, pipelines in the concrete conveying pipeline industry have the following defects:
(1) The inner tube is provided with a through notch, and a wear-resistant ceramic block is arranged in the notch, so that the structure destroys the completeness of the inner tube, and a bonding crack is easy to generate at the notch. After the concrete is repeatedly impacted by concrete media in the using process, the combination crack is easily expanded, and finally the concrete directly abrades the filling layer, so that the service life of the pipeline is greatly reduced;
(2) The mechanical combination mode of adhesive is adopted between the wear-resisting ceramic block and the outer tube arranged in the gap, and the bonded ceramic block falling risk is easy to occur in the use process. Meanwhile, the production efficiency of the adhesive is low, and the process stability is difficult to ensure;
(3) Wear-resisting ceramic block that sets up in the breach needs the burst to paste, if adopt a slice ceramic block then the ceramic block very easily broken under the concrete strikes, and the burst pastes the in-process and is difficult to control the gap between each piece, has increased the risk of card material stifled pipe.
Disclosure of Invention
The invention provides material conveying equipment, a concrete feeding pipe and a manufacturing method thereof, which are used for solving the defects that a wear-resistant block in the feeding pipe is easy to fall and break and has poor shock resistance in the prior art and realizing the advantages of good structural strength and strong wear resistance of the concrete feeding pipe.
The invention provides a concrete feeding pipe, comprising:
the pipe comprises a pipe body, wherein a groove is formed in the inner wall surface of the pipe body;
the wearing layer, the wearing layer is located in the recess, just the wearing layer orientation the inboard surface of body with body internal surface parallel and level.
According to the concrete feeding pipe provided by the invention, the thickness of the wear-resistant layer is 2mm-4mm.
According to the concrete feeding pipe provided by the invention, the wear-resistant layer is internally provided with metal particles.
According to the concrete feeding pipe provided by the invention, the pipe body is a single-layer pipe and is made of ZG35.
According to the concrete feeding pipe provided by the invention, the pipe body comprises an inner layer pipe, an outer layer pipe and a filling layer, the outer layer pipe is sleeved outside the inner layer pipe, the filling layer is positioned between the inner layer pipe and the outer layer pipe, and the groove is positioned on the inner surface of the inner layer pipe.
According to the concrete feeding pipe provided by the invention, the inner layer pipe is made of high-chromium cast iron, the filling layer is made of cement mortar, and the outer layer pipe is made of low-carbon steel.
According to the concrete feeding pipe provided by the invention, the pipe body is a straight pipe or a bent pipe.
According to the concrete feeding pipe provided by the invention, the wear-resistant layer is a ceramic coating, and the ceramic coating is made of titanium carbide or tungsten carbide.
The invention also provides material conveying equipment which comprises the concrete feeding pipe, wherein the concrete feeding pipe is used for conveying materials.
The invention also provides a manufacturing method of the concrete feeding pipe, which comprises the following steps:
obtaining wear-resistant particles;
metallizing the wear resistant particles and forming a wear resistant layer;
and co-casting the pipe body material and the wear-resistant layer to obtain the concrete feeding pipe.
According to the manufacturing method of the concrete feeding pipe, the pipe body is made of high-chromium cast iron liquid, and the casting temperature is 1480 ℃.
According to the manufacturing method of the concrete feeding pipe, the material of the pipe body is ZG35, and the casting temperature is 1540 ℃.
According to the concrete feeding pipe provided by the invention, the wear-resistant layer is arranged on the inner wall of the pipe body, and the wear-resistant layer is limited on the inner wall of the pipe body through the groove, so that on one hand, the wear-resistant property of the wear-resistant layer can be utilized to improve the wear-resistant strength of the concrete feeding pipe; on the other hand, the recess can also be injectd the position of wearing layer, promotes the connection tightness between wearing layer and the body.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a cross-sectional view of a concrete feeding pipe provided by the invention, wherein the concrete feeding pipe is a double-layer bent pipe, and the cross section is parallel to the axis of the concrete feeding pipe;
FIG. 2 is a cross-sectional view of the concrete feed tube of FIG. 1, wherein the cross-section is perpendicular to the axis of the concrete feed tube;
FIG. 3 is a cross-sectional view of the concrete feeding pipe provided by the present invention, wherein the concrete feeding pipe is a single-layer bent pipe and the cross-section is parallel to the axis of the concrete feeding pipe;
FIG. 4 is a cross-sectional view of the concrete feed tube of FIG. 3, wherein the cross-section is perpendicular to the axis of the concrete feed tube;
FIG. 5 is a flow chart of a method of manufacturing a concrete feed tube according to the present invention;
reference numerals are as follows:
100. a concrete feeding pipe;
110. a tube body; 112. an inner layer tube; 113. an outer tube; 114. a filling layer;
120. a wear resistant layer;
130. a flange; 140. a wear-resistant sleeve.
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.
The material conveying apparatus, the concrete feed pipe 100 and the method of manufacturing the same of the present invention will be described with reference to fig. 1 to 5. It should be noted that the material conveying equipment may be a concrete pump truck, a cement pump truck, a slurry pump truck, or the like. The concrete feed pipe 100 is a component on a material handling apparatus that can transport concrete, cement, or slurry from a first location to a second location.
Referring to fig. 1, a concrete feeding pipe 100 according to an embodiment of the present invention includes a pipe body 110 and a wear layer 120.
Specifically, a groove is formed on the inner wall surface of the pipe body 110, the wear-resistant layer 120 is disposed in the groove, and the surface of the wear-resistant layer 120 facing the inner side of the pipe body 110 is flush with the inner surface of the pipe body 110. The wear-resistant layer 120 is arranged on the inner wall of the pipe body 110 and is limited on the inner wall of the pipe body 110 through the groove, so that on one hand, the wear-resistant strength of the concrete feeding pipe 100 can be improved by utilizing the wear-resistant characteristic of the wear-resistant layer 120; on the other hand, the groove can also define the position of the wear-resistant layer 120, and the connection tightness between the wear-resistant layer 120 and the pipe body 110 is improved.
According to some embodiments of the invention, the wear layer 120 may have a thickness of 2mm to 4mm. Thereby, the wear-resistant properties of the wear-resistant layer 120 can be ensured. In other words, the depth of the groove is 2mm to 4mm, and the depth of the groove is equal to the thickness of the wear-resistant layer 120.
The shape of the tube 110 is not limited, for example, in some embodiments, the tube 110 may be a straight tube or a curved tube. For convenience of description, the concrete feeding pipe 100 is taken as an elbow pipe, the concrete feeding pipe 100 may be a 90 ° elbow pipe, one end of the concrete feeding pipe 100 is connected to the flange 130, and the other end is connected to the wear-resistant sleeve 140. The material of the flange 130 may be low-carbon steel, and the material of the wear-resistant sleeve 140 may be high-chromium cast iron. Referring to fig. 1, the corresponding central angle of the groove in the axial direction of the elbow is 45 °. That is to say, set up first section, the axis of this return bend is located in first section, utilize first section to dissect the return bend, the recess corresponds on first section and forms the arc wall, and central angle a that the arc length corresponds is 45. Referring to fig. 2, a second section is provided, the axis of the elbow is perpendicular to the second section, the elbow is cut by the second section, the groove correspondingly forms an arc-shaped groove on the second section, and the central angle B corresponding to the arc length is 120 °.
According to some embodiments of the present invention, the wear-resistant layer 120 is a ceramic coating made of titanium carbide or tungsten carbide. Because the pipe body 110 can be a metal pipe, in order to improve the bonding strength between the ceramic coating and the metal pipe, in some embodiments, metal particles are arranged in the wear-resistant layer 120, so that the wear-resistant layer 120 can be metalized, the wettability between the wear-resistant layer and molten iron is further improved, the ceramic coating and the metal pipe can be tightly bonded, and the ceramic coating is prevented from falling off. Furthermore, when the ceramic coating is prepared, metal Ni is added into the ceramic particles to realize metallization, and the wettability between the ceramic coating and the metal tube is improved.
According to some embodiments of the present invention, referring to fig. 3 and 4, the tube 110 may be a single-layer tube, and the tube 110 may be made of ZG35. It should be noted that the structure of the tube body 110 is not limited in particular, for example, in some embodiments, the tube body 110 includes an inner tube 112, an outer tube 113 and a filling layer 114, the outer tube 113 is sleeved on the inner tube 112, the filling layer 114 is located between the inner tube 112 and the outer tube 113, and the groove is located on the inner surface of the inner tube 112. The inner tube 112 may be made of high chromium cast iron, and the outer tube 113 may be made of low carbon steel. The material of the filling layer 114 may be cement mortar, and the filling layer 114 may fill a gap between the inner layer pipe 112 and the outer layer pipe 113. Further, the inner layer tube 112 may be made of high chromium cast iron (Cr 26), and the outer layer tube 113 may be made of low carbon steel.
The material conveying equipment comprises the concrete feeding pipe 100, and the concrete feeding pipe 100 is used for conveying materials. According to the material conveying equipment provided by the embodiment of the invention, the wear-resisting property of the wear-resisting layer 120 can be utilized to improve the wear-resisting strength of the concrete feeding pipe 100, and the position of the wear-resisting layer 120 can be limited by utilizing the groove to improve the connection tightness between the wear-resisting layer 120 and the pipe body 110.
Referring to fig. 5, according to the method for manufacturing the concrete feeding pipe 100 of the embodiment of the present invention, the concrete feeding pipe 100 is the concrete feeding pipe 100 as described above, and the manufacturing method includes:
s10: obtaining wear-resistant particles, wherein the wear-resistant particles can be ceramic particles, and the ceramic particles can be a mixture of titanium carbide and tungsten carbide;
s20: the wear resistant particles are metallized and form the wear resistant layer 120. Here, metal Ni may be added to the wear-resistant particles and metallized, whereby wettability between the wear-resistant layer 120 and the pipe body 110 may be improved;
s30: the body material and the wear layer 120 are co-cast to obtain the concrete feed tube 100. In the concrete feeding pipe 100 obtained by casting, the wear-resistant layer 120 is embedded in the pipe body 110, that is, the inner wall of the pipe body 110 is provided with a groove for accommodating the wear-resistant layer 120.
According to some embodiments of the present invention, the pipe body 110 includes an inner pipe 112, an outer pipe 113, and a filler layer 114, the outer pipe 113 is disposed around the inner pipe 112, the filler layer 114 is disposed between the inner pipe 112 and the outer pipe 113, and the groove is disposed on an inner surface of the inner pipe 112. That is, the pipe body 110 has a double-layer structure, and the pipe body material in step S30 is an inner pipe material, that is, the inner pipe material and the wear layer 120 are co-cast to obtain the inner pipe 112 of the concrete feeding pipe 100. In some embodiments, after step S30, the outer tube 113 may be formed by casting, and the filling material is filled between the inner tube 112 and the outer tube 113, so as to construct the complete concrete feeding tube 100.
In some embodiments, the tube material may be high chromium iron casting at 1480 ℃. In some embodiments, when the tube body 110 is a single layer structure, the tube body material is ZG35 and the casting temperature is 1540 ℃.
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 (12)
1. A concrete feeding pipe, comprising:
the inner wall surface of the pipe body is provided with a groove;
the wearing layer, the wearing layer is located in the recess, just the wearing layer orientation the inboard surface of body with body internal surface parallel and level.
2. The concrete feed pipe of claim 1, wherein the wear layer has a thickness of 2mm to 4mm.
3. The concrete feed tube of claim 1, wherein the wear layer has metal particles therein.
4. The concrete feeding pipe according to claim 1, wherein the pipe body is a single-layer pipe, and the material of the pipe body is ZG35.
5. The concrete feed pipe of claim 1, wherein the pipe body comprises an inner pipe, an outer pipe and a filler layer, the outer pipe is sleeved on the inner pipe, the filler layer is located between the inner pipe and the outer pipe, and the groove is located on the inner surface of the inner pipe.
6. The concrete feeding pipe according to claim 5, wherein the inner layer pipe is made of high-chromium cast iron, the filling layer is made of cement mortar, and the outer layer pipe is made of low-carbon steel.
7. The concrete feeding tube according to claim 1, wherein the tube body is a straight tube or a bent tube.
8. The concrete feeder tube according to any one of claims 1-7, wherein the wear resistant layer is a ceramic coating made of titanium carbide or tungsten carbide.
9. A material conveying apparatus, characterized by comprising a concrete feeder pipe according to any one of claims 1-8 for conveying material.
10. A method of manufacturing a concrete feeder pipe, the concrete feeder pipe being a concrete feeder pipe according to any one of claims 1 to 8, the method comprising:
obtaining wear-resistant particles;
metallizing the wear resistant particles and forming a wear resistant layer;
and co-casting the pipe body material and the wear-resistant layer to obtain the concrete feeding pipe.
11. The method of claim 10, wherein the body material is high chromium cast iron and the casting temperature is 1480 ℃.
12. The method of manufacturing a concrete feeder tube according to claim 10, wherein said tube body material is ZG35 and the casting temperature is 1540 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210952716.6A CN115183077A (en) | 2022-08-09 | 2022-08-09 | Material conveying equipment, concrete feeding pipe and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210952716.6A CN115183077A (en) | 2022-08-09 | 2022-08-09 | Material conveying equipment, concrete feeding pipe and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115183077A true CN115183077A (en) | 2022-10-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210952716.6A Pending CN115183077A (en) | 2022-08-09 | 2022-08-09 | Material conveying equipment, concrete feeding pipe and manufacturing method thereof |
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| CN (1) | CN115183077A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6467812B1 (en) * | 1994-06-23 | 2002-10-22 | Construction Forms, Inc. | Pipe having replaceable wear resistant lined coupler |
| CN202419005U (en) * | 2011-10-28 | 2012-09-05 | 三一重工股份有限公司 | Embedded compound elbow and concrete conveying equipment |
| CN203286190U (en) * | 2013-05-06 | 2013-11-13 | 徐州徐工施维英机械有限公司 | Concrete transportation wear-resisting elbow and concrete pump truck |
| CN105671548A (en) * | 2016-03-29 | 2016-06-15 | 湖南三一中阳机械有限公司 | Elbow and elbow manufacturing method |
| CN111765326A (en) * | 2020-06-23 | 2020-10-13 | 三一汽车制造有限公司 | Pipeline, preparation method of pipeline and concrete machine |
| CN114311277A (en) * | 2021-12-30 | 2022-04-12 | 江苏徐工工程机械研究院有限公司 | Manufacturing method of concrete conveying pipe, concrete conveying pipe and concrete pump truck |
-
2022
- 2022-08-09 CN CN202210952716.6A patent/CN115183077A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6467812B1 (en) * | 1994-06-23 | 2002-10-22 | Construction Forms, Inc. | Pipe having replaceable wear resistant lined coupler |
| CN202419005U (en) * | 2011-10-28 | 2012-09-05 | 三一重工股份有限公司 | Embedded compound elbow and concrete conveying equipment |
| CN203286190U (en) * | 2013-05-06 | 2013-11-13 | 徐州徐工施维英机械有限公司 | Concrete transportation wear-resisting elbow and concrete pump truck |
| CN105671548A (en) * | 2016-03-29 | 2016-06-15 | 湖南三一中阳机械有限公司 | Elbow and elbow manufacturing method |
| CN111765326A (en) * | 2020-06-23 | 2020-10-13 | 三一汽车制造有限公司 | Pipeline, preparation method of pipeline and concrete machine |
| CN114311277A (en) * | 2021-12-30 | 2022-04-12 | 江苏徐工工程机械研究院有限公司 | Manufacturing method of concrete conveying pipe, concrete conveying pipe and concrete pump truck |
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Application publication date: 20221014 |