CN107252941B - Preparation method of material throwing head - Google Patents
Preparation method of material throwing head Download PDFInfo
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- CN107252941B CN107252941B CN201710478283.4A CN201710478283A CN107252941B CN 107252941 B CN107252941 B CN 107252941B CN 201710478283 A CN201710478283 A CN 201710478283A CN 107252941 B CN107252941 B CN 107252941B
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- Prior art keywords
- lining plate
- diamond
- brazing
- diamond layer
- protective agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/002—Soldering by means of induction heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The invention discloses a preparation method of a throwing head. The preparation method of the material throwing head comprises the following steps: providing a diamond compact, wherein the diamond compact comprises a hard alloy substrate and a diamond layer arranged on the hard alloy substrate; providing a lining plate base body; the hard alloy substrate is connected to the substrate by brazing to form a backing plate, and the surface of the diamond layer is covered with a protective agent before brazing to prevent the diamond layer from carbonizing or oxidizing during brazing. According to the preparation method of the polishing head, when the diamond compact is brazed on the hard alloy substrate, the surface of the diamond layer is covered with the protective agent to prevent the diamond layer from being carbonized or oxidized in the brazing process, so that the diamond layer is protected.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a preparation method of a material throwing head.
Background
The throwing head bears the impact and friction of high-speed stone when the vertical shaft impact crusher works, and is a conventional wearing part of the vertical shaft impact crusher. The material throwing head consists of a material throwing head base body and a lining plate, and the service life of the material throwing head mainly depends on the lining plate of the material throwing head. The lining plate in the prior art is generally prepared from hard alloy, and the hard alloy is prepared from carbide of refractory metal and bonding metal by a powder metallurgy process. On one hand, due to the property of the hard phase, the space for greatly improving the hardness of the hard alloy is not large, so that the space for greatly improving the service life of the hard alloy lining plate is not large; secondly, if the hardness is designed to be too high, the brittleness of the hard alloy is increased, and the lining plate cannot bear the impact force of high-speed stone and is broken to cause the premature failure of the lining plate; thirdly, the base body of the throwing head is not wear-resistant enough, and the base body is worn quickly, so that the service cycle of the throwing head is influenced.
In addition, in the prior art, when the material throwing head is prepared, the hard alloy lining plate is connected with the material throwing head base body by using epoxy resin glue. If the bonding strength is not good, under the continuous impact of high-speed stone, the lining plate of the throwing head is separated from the base body of the throwing head.
Disclosure of Invention
The invention aims to provide a preparation method of a material throwing head, which aims to prolong the service life of the material throwing head.
The invention provides a preparation method of a throwing head, which comprises the following steps:
providing a diamond compact, wherein the diamond compact comprises a hard alloy substrate and a diamond layer arranged on the hard alloy substrate;
providing a lining plate base body;
the hard alloy substrate is connected to the substrate by brazing to form a backing plate, and the surface of the diamond layer is covered with a protective agent before brazing to prevent the diamond layer from carbonizing or oxidizing during brazing.
Further, the protective agent contains borax, potassium fluoborate, potassium chloride and potassium carbonate.
Further, in the protective agent, borax: potassium fluoroborate: potassium fluoride: the proportion of potassium carbonate is: 40-60 parts by weight: 10-20 parts by weight: 5-10 parts by weight: 5 to 10 parts by weight.
Further, the protective agent is in the form of powder, and the protective agent is sprinkled on the surface of the diamond layer or is mixed into paste with water and then applied on the surface of the diamond layer.
Furthermore, the brazing temperature is 650-850 ℃, and the brazing time is 10-60 s.
Further, after the diamond compact is connected to the lining substrate to form the lining plate, the lining plate is corrected, and the arching height of the working surface of the lining plate, on which the diamond compact is arranged, is smaller than 3 mm.
Further, the assembly surface of the lining plate is milled flat after the lining plate is straightened.
Further, the preparation method of the throwing head also comprises the step of assembling the lining plate on the throwing head base body.
Further, the throwing head base body comprises a mounting groove for assembling the lining plate, the lining plate is bonded in the mounting groove by using an adhesive, and the lining plate is connected in the mounting groove by using a threaded connecting piece and is solidified.
Further, the diamond compacts with different surface shapes of the diamond layer are selected according to different use working conditions of the polishing head.
Based on the preparation method of the polishing head provided by the invention, the prepared lining plate comprises the lining plate substrate and the diamond composite sheet, and the abrasive resistance of the diamond composite sheet ensures that the working surface of the polishing head is higher in abrasive resistance, so that the service life of the polishing head is prolonged. In addition, the preparation method of the polishing head covers the protective agent on the surface of the diamond layer when the diamond composite sheet is brazed on the hard alloy substrate so as to prevent the diamond layer from carbonizing or oxidizing in the brazing process, thereby protecting the diamond layer.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a diamond compact according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a diamond compact according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a liner substrate according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a liner plate according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a matrix of the throwing head according to the embodiment of the present invention;
fig. 6 is a schematic view of a material throwing head structure according to an embodiment of the present invention.
Each reference numeral represents:
1-a diamond compact; 11-a cemented carbide substrate; 12-a diamond layer; 2-lining board base body; 22-countersunk holes; 23-diamond compact mounting groove; 3-throwing the stub bar base body; 31-a lining plate mounting groove; 32-weld overlay.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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 relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1 to 6, the method for manufacturing a material throwing head according to the embodiment of the present invention includes the following steps:
the method comprises the following steps: a diamond compact 1 is provided. The diamond compact 1 includes a cemented carbide substrate 11 and a diamond layer 12 provided on the cemented carbide substrate 11.
Step two: a liner substrate 2 is provided.
Step three: the cemented carbide substrate 11 is attached to the backing substrate 2 by brazing to form a backing and the surface of the diamond layer 12 is coated with a protective agent prior to brazing to prevent the diamond layer from carbonizing or oxidizing during brazing.
According to the preparation method of the polishing head provided by the embodiment of the invention, the lining plate consisting of the lining plate substrate and the diamond compact is prepared through the steps, and the wear resistance of the diamond compact ensures that the working surface of the polishing head provided by the embodiment of the invention has higher wear resistance, so that the service life of the polishing head is prolonged. In addition, according to the preparation method of the polishing head provided by the embodiment of the invention, when the diamond compact is brazed on the hard alloy substrate, the surface of the diamond layer is covered with the protective agent to prevent the diamond layer from being carbonized or oxidized in the brazing process, so that the diamond layer is protected, and compared with the prior art in which the diamond layer is protected in a vacuum atmosphere, the preparation method is low in cost and easy to popularize and use in production practice.
As shown in fig. 3, the backing substrate 2 of the present embodiment is provided with a plurality of diamond compact mounting grooves 23 for mounting the diamond compact 1. The plurality of diamond compact mounting grooves 23 form a honeycomb-like structure. And a small space is reserved between two adjacent diamond compact mounting grooves 23.
Preferably, in this embodiment, the protective agent contains borax, potassium fluoborate, potassium chloride and potassium carbonate. It should be noted that the protective agent of this embodiment mainly contains the above four components, but it is not excluded that other components may be contained.
Preferably, in the protective agent, the ratio of borax: potassium fluoroborate: potassium fluoride: the proportion of potassium carbonate is: 40-60 parts by weight: 10-20 parts by weight: 5-10 parts by weight: 5 to 10 parts by weight. The protective agent formed by weighing the corresponding components according to the proportion has the optimal protective effect on the diamond layer.
The protective agent formed by mixing the components is powdery, and the protective agent can be sprinkled on the surface of the diamond layer in the specific implementation process. The protective agent can also be mixed with water into paste and then coated on the surface of the diamond layer. The protective agent can be more easily attached to the surface of the diamond layer by being mixed into paste by water and then being coated on the surface of the diamond layer, so that the diamond layer is better protected.
Preferably, after the components are mixed uniformly, the mixture is blended into paste by deionized water.
Preferably, the brazing process can be performed by a high-frequency induction brazing method. The brazing temperature is 650-850 ℃, and the brazing time is 10-60 s.
The lining plate 2 comprises a working surface provided with the diamond compact and a bottom surface assembling surface opposite to the working surface.
Preferably, after the diamond compact is connected to the lining substrate to form the lining substrate in the third step, the lining substrate is corrected, and the arching height of the working surface of the lining substrate on which the diamond compact is arranged is smaller than 3 mm. During correction, the pressure can be applied to the welded lining plate by a press machine, so that the lining plate has certain degree of reversible deformation and is kept for a certain time to realize correction.
And after the lining plate is corrected, the assembling surface of the lining plate is milled flat. Because the assembly surface of welt will assemble with the welt mounting groove on the throwing stub bar base member, in order to guarantee the reliability of being connected between welt and the throwing stub bar base member, the assembly surface of welt will mill the level.
Specifically, the bottom surface of the lining plate is milled flat until the lining plate is placed on a horizontal plane so as to be completely attached.
After the liner (as shown in figure 4) is prepared, it is next completed to mount the liner on the throwing head base.
As shown in fig. 5, the throwing head base 3 includes a liner installation groove 31 for installing a liner. And screw holes are arranged in the lining plate mounting groove 31. Which are arranged corresponding to and dimensioned with counter bores 22 (see fig. 3) provided in the liner base body 2. During assembly, the lining plate is adhered in the lining plate mounting groove by using an adhesive, and the lining plate is connected in the lining plate mounting groove by using a threaded connecting piece and is solidified.
The shape of the throwing head base shown in figures 5 and 6 is substantially cuboid. However, the preparation method of the throwing head provided by the invention is not limited to that the base body of the throwing head is a cuboid, and the base body of the throwing head can be in other shapes. Of course, the shape of the liner plate mounting groove is not limited to the rectangular parallelepiped shape shown in the drawings.
Specifically, the sand blasting treatment is carried out on a lining plate mounting groove of the throwing head base body and a surface to be assembled of the lining plate. And the prepared resin adhesive is coated in the lining plate mounting groove, and the lining plate is placed in the lining plate mounting groove and fastened by a bolt. And solidifying the assembled combination of the lining plate and the throwing head base body to obtain the throwing head, as shown in fig. 6. According to the preparation method of the throwing head provided by the embodiment of the invention, the lining plate and the throwing head base body are connected by adopting a method combining two modes of adhesive bonding and bolt fastening, so that the lining plate and the throwing head base body have higher connection strength, the service life of the throwing head is prolonged, and the use safety of the throwing head can be favorably ensured.
Preferably, the fitting surface of the lining plate mounting groove should have a certain roughness before the resin glue is applied.
Preferably, in order to improve the wear resistance of the throwing head, a weld overlay 32 is provided on the inside of the throwing head base body 3. The length of the surfacing layer is consistent with the area of the diamond composite sheet on the lining plate, the width of the surfacing layer is determined according to specific conditions, and the position of the surfacing layer is close to one side of the lining plate mounting groove of the base body of the polishing head. The overlay powder may be an iron-based powder.
Preferably, the diamond compacts with different surface shapes of the diamond layer are selected according to different use working conditions of the polishing head. As shown in fig. 1, when the material throwing head used under the low impact force condition is prepared, a planar diamond compact can be selected. When the material throwing head used under the working condition of high impact force is prepared, the cambered-surface-shaped diamond compact can be selected.
The following will describe in detail a method for manufacturing a throwing head used under a low impact force condition and a method for manufacturing a throwing head used under a high impact force condition.
The preparation method of the throwing head used under the low-impact working condition comprises the following steps:
firstly, selecting a plane type diamond compact and a throwing head substrate, and enabling the size (length multiplied by width multiplied by height) of a lining plate mounting groove to be as follows: 302mm × 15mm × 24mm, the size of the diamond compact: diameter 13.4mm x total height 8.0mm, diamond layer thickness 1.5 mm.
And (3) designing a structural size diagram of the lining plate substrate by combining the size of the lining plate mounting groove and the size of the diamond compact, and processing according to the size diagram to obtain the lining plate substrate (which can be made of 45 steel).
And carrying out sand blasting treatment on the substrate of the substrate and the diamond composite sheet, cleaning the substrate and the diamond composite sheet by using acetone, and drying the substrate and the diamond composite sheet for later use. Cutting the brazing filler metal, putting the brazing filler metal into acetone, cleaning and drying the brazing filler metal for later use. The powdered brazing flux is mixed into pasty brazing flux for later use. Smearing brazing flux in a diamond composite sheet mounting groove of the lining plate, putting brazing filler metal in the groove, smearing brazing flux on the brazing filler metal again, putting a diamond composite sheet to be welded in the groove, smearing protective agent on a diamond layer, putting the diamond composite sheet into an induction brazing machine for brazing after preparation is finished, keeping the temperature at 650 ℃, keeping the brazing time at 60s, transferring the brazing filler metal into a heat preservation furnace for heat preservation after the brazing is finished, keeping the temperature at 250 ℃, keeping the heat preservation time at 4h, taking out the brazing filler metal from the brazing filler metal after the heat preservation time is up, taking out the brazing filler metal residues and oxide skins after the heat preservation time is up.
And (4) performing brazing deformation correction on the lining plate, and milling the bottom surface of the lining plate flat.
Preparing a material throwing head base body by adopting 45 steel, and overlaying a wear-resistant layer on the inner side of the material throwing head base body close to the notch area.
Preparing resin adhesive, cleaning a lining plate mounting groove and a lining plate, coating the resin adhesive in the lining plate mounting groove, putting the lining plate into the lining plate, fastening the lining plate by using bolts, and then putting the lining plate into a heat preservation furnace for curing at the curing temperature of 100 ℃ for 3 hours to obtain the casting head.
The preparation method of the throwing head used under the high impact working condition comprises the following steps:
firstly, selecting a cambered surface type diamond compact and a throwing head matrix, and enabling the size (length multiplied by width multiplied by height) of a lining plate mounting groove of the throwing head matrix to be as follows: the specification of the cambered surface type diamond compact is 1608 (the diameter is 16.0mm, the total height is 8.0mm, the cambered surface curvature radius is 17mm, and the diamond layer thickness is 1.5mm) according to the size of the lining plate mounting groove.
And (3) designing a structural size diagram of the liner plate substrate by combining the size of the liner plate mounting groove and the size of the diamond compact, and machining according to the size diagram to obtain the liner plate substrate which is made of 45 steel.
And carrying out sand blasting treatment on the substrate of the substrate and the diamond composite sheet, cleaning the substrate and the diamond composite sheet by using acetone, and drying the substrate and the diamond composite sheet for later use. Cutting the brazing filler metal, putting the brazing filler metal into acetone, cleaning and drying the brazing filler metal for later use. The powdered brazing flux is mixed into pasty brazing flux for later use. And (2) smearing soldering flux in a diamond composite sheet mounting groove of the lining plate, putting brazing filler metal, smearing the soldering flux on the brazing filler metal, putting a diamond composite sheet to be welded, smearing protective agent on a diamond layer, putting the diamond composite sheet into an induction brazing machine for brazing after preparation is finished, keeping the temperature at 750 ℃, keeping the brazing time at 10s, transferring the brazing filler metal into a heat preservation furnace for heat preservation after the brazing is finished, keeping the temperature at 400 ℃, keeping the heat preservation time at 2h, taking out the brazing filler metal from the brazing filler metal for air cooling after the heat preservation time is up, and carrying out sand blasting treatment on the brazed part after the cooling is.
And (4) performing brazing deformation correction on the lining plate, and milling the bottom surface of the lining plate flat.
Preparing a throwing head base body by adopting 45 steel, and overlaying a wear-resistant layer in a region close to a notch on the inner side of the throwing head base body;
preparing resin adhesive, cleaning a lining plate mounting groove and a lining plate, coating the resin adhesive in the lining plate groove, putting the lining plate into the lining plate, fastening the lining plate by using bolts, and then putting the lining plate into a heat preservation furnace for curing at the curing temperature of 150 ℃ for 2 hours to obtain the casting head.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (5)
1. The preparation method of the throwing head is characterized by comprising the following steps:
providing a diamond compact, wherein the diamond compact comprises a hard alloy substrate and a diamond layer arranged on the hard alloy substrate;
providing a lining plate base body;
connecting the hard alloy substrate to the lining substrate by brazing to form a lining and covering the surface of the diamond layer with a protective agent before brazing to prevent the diamond layer from carbonizing or oxidizing in the brazing process;
after the diamond compact is connected to the lining plate substrate to form the lining plate, correcting the lining plate and enabling the arching height of the working surface of the lining plate, on which the diamond compact is arranged, to be less than 3 mm;
the protective agent contains borax, potassium fluoborate, potassium chloride and potassium carbonate; in the protective agent, borax: potassium fluoroborate: potassium fluoride: the proportion of potassium carbonate is: 40-60 parts by weight: 10-20 parts by weight: 5-10 parts by weight: 5-10 parts by weight;
the preparation method of the throwing head also comprises the step of assembling the lining plate on a throwing head base body;
throwing stub bar base member is including being used for the assembly the mounting groove of welt utilizes the adhesive will the welt adhere in the mounting groove and utilize threaded connection spare will the welt connect in the mounting groove and solidify, and make before scribbling the adhesive the fitting surface of mounting groove has predetermined roughness.
2. The method for manufacturing a polishing head according to claim 1, wherein the protective agent is in a powder form, and the protective agent is applied to the surface of the diamond layer by spraying the protective agent on the surface of the diamond layer or by mixing the protective agent into a paste with water and then applying the paste to the surface of the diamond layer.
3. The manufacturing method of the throwing head according to any one of claims 1 to 2, wherein the brazing temperature is 650 ℃ to 850 ℃ and the brazing time is 10 to 60 s.
4. The method for manufacturing a throwing head according to claim 1, wherein the assembly surface of the lining plate is milled flat after the lining plate is straightened.
5. The manufacturing method of the polishing head as claimed in any one of claims 1 to 2, wherein the diamond compact of which the surface shape of the diamond layer is different is selected according to different use conditions of the polishing head.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710478283.4A CN107252941B (en) | 2017-06-22 | 2017-06-22 | Preparation method of material throwing head |
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| CN201710478283.4A CN107252941B (en) | 2017-06-22 | 2017-06-22 | Preparation method of material throwing head |
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| CN107252941A CN107252941A (en) | 2017-10-17 |
| CN107252941B true CN107252941B (en) | 2020-03-20 |
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| CN110756277B (en) * | 2019-09-12 | 2021-06-01 | 来宾市兴宾区日昌升新材料有限公司 | Material throwing head of vertical shaft type crusher |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1018342B (en) * | 1990-06-14 | 1992-09-23 | 国家建筑材料工业局人工晶体研究所 | Soldering flux and soldering paste diamond tool |
| CN1644319A (en) * | 2004-01-19 | 2005-07-27 | 广东工业大学 | Manufacture of single-layer diamond grinder |
| CN102303192A (en) * | 2011-05-06 | 2012-01-04 | 成都比拓超硬材料有限公司 | Method for improving applicability of polycrystalline diamond composite sheet serving as drill tooth/cutter tooth |
| CN102814601B (en) * | 2012-01-15 | 2015-07-01 | 河南飞孟金刚石工业有限公司 | Soldering flux for brazing diamond cemented carbide sand and preparation method for soldering flux |
| GB201215469D0 (en) * | 2012-08-30 | 2012-10-17 | Element Six Ltd | Diamond constructions, tools comprising same and method for making same |
| CN205269858U (en) * | 2015-11-10 | 2016-06-01 | 徐工集团工程机械股份有限公司 | PDC material throwing head welt |
| CN205517987U (en) * | 2016-02-16 | 2016-08-31 | 徐工集团工程机械有限公司 | Wear -resisting material throwing head |
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Effective date of registration: 20220810 Address after: 221004 26 Tuo Lan Shan Road, Xuzhou economic and Technological Development Zone, Jiangsu Patentee after: JIANGSU XUGONG ENGINEERING MACHINERY RESEARCH INSTITUTE Co.,Ltd. Address before: 221004 26 Tuo Lan Shan Road, Xuzhou economic and Technological Development Zone, Jiangsu Patentee before: XCMG CONSTRUCTION MACHINERY Co.,Ltd. |
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