CN114319020B - Emulsified asphalt sprinkling equipment - Google Patents
Emulsified asphalt sprinkling equipment Download PDFInfo
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- CN114319020B CN114319020B CN202210142742.2A CN202210142742A CN114319020B CN 114319020 B CN114319020 B CN 114319020B CN 202210142742 A CN202210142742 A CN 202210142742A CN 114319020 B CN114319020 B CN 114319020B
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Abstract
The utility model relates to an asphalt paving equipment field especially relates to an emulsion asphalt spraying equipment and paving method of using this equipment, and it includes the automobile body, set up jar body, output structure and spraying structure on the automobile body, the jar is internal to be divided into upper strata and lower floor through the baffle along its jar body length direction, the baffle is close to the intercommunication upper strata with the connecting hole of lower floor has been seted up to the one end department of jar body, output structure includes first duplex pump and temporary storage structure, the import of first duplex pump with the lower floor is kept away from one side of connecting hole is linked together through the pipeline, first export of first duplex pump with the upper strata is kept away from one side of connecting hole is linked together through the pipeline, the second export of first duplex pump is through pipeline butt joint temporary storage structure, just the second exit pipeline series of first duplex pump has the start and stop valve. The application has the effect that realizes that asphalt distribution truck can stably store emulsified asphalt.
Description
Technical Field
The application relates to the field of asphalt paving equipment, in particular to emulsified asphalt spraying equipment.
Background
Asphalt is a waterproof, moistureproof and anticorrosive organic cementing material, is often used as a pavement structure cementing material in road engineering, and can be matched with mineral materials with different compositions in proportion to build asphalt pavement with different structures, wherein the asphalt is widely applied in highway construction, but is usually kept in a liquid state under a high-temperature condition, so that the fluidity of the asphalt can be ensured when the asphalt is sprayed, and a large amount of energy is consumed for keeping the high-temperature state of the asphalt, thereby increasing the construction cost.
The emulsified asphalt is an oil-in-water emulsifying agent which is prepared by mixing asphalt, water and an emulsifying agent through a mechanical stirring and chemical stabilization method, wherein the asphalt is diffused into water to be liquefied into a road building material with low viscosity and good fluidity at normal temperature, the road building material replaces an asphalt material used under normal high temperature conditions, and the use cost of the asphalt is greatly saved.
In the use of emulsified asphalt, emulsified asphalt is sprayed on the ground mainly through an asphalt distributor, and the existing asphalt distributor directly extracts emulsified asphalt through a pump body and sprays the emulsified asphalt on the ground through a spray gun.
However, because the emulsified asphalt is used as emulsion, the emulsion has unstable characteristic, and demulsification phenomenon is easy to occur in the external environment, so that in road construction, the single use amount is calculated before each use of the emulsified asphalt, the single use is completed as much as possible, the preparation and filling processes of the emulsified asphalt are frequent, and the use is troublesome; and when the emulsified asphalt is placed in an asphalt distribution truck, the emulsified asphalt can generate a certain degree of emulsified phase separation under the action of gravity and other factors, so that the two phases of the emulsified asphalt are unevenly distributed, the problem of different asphalt content distribution of front and rear road sections after the emulsified asphalt is sprayed is caused, and the problem that a local road section does not accord with the construction standard is easily caused.
Disclosure of Invention
In order to realize that the asphalt distribution truck can stably store emulsified asphalt, the application provides emulsified asphalt distribution equipment and a paving method using the same.
The application provides an emulsified asphalt sprinkling device and a paving method using the same, which adopts the following technical scheme:
in a first aspect, the application provides an emulsified asphalt spraying device which adopts the following technical scheme:
the utility model provides an emulsified asphalt sprinkling equipment, includes the automobile body, be provided with on the automobile body be used for holding emulsified asphalt's jar body, be used for the output emulsified asphalt's in jar body output structure and be used for emulsified asphalt to spray the structure, the jar is internal to divide into upper strata and lower floor through the baffle along its jar body length direction, the baffle is close to the one end department of jar body has seted up the intercommunication the upper strata with the connecting hole of lower floor, output structure includes first duplex pump and temporary storage structure, the import of first duplex pump with the lower floor is kept away from one side of connecting hole is linked together through the pipeline to it has the start-stop valve to establish ties on the pipeline between the two, first export of first duplex pump with the upper strata is kept away from one side of connecting hole is linked together through the pipeline to establish ties on the pipeline between the two has the start-stop valve, the second export of first duplex pump is through the pipeline butt joint temporary storage structure, just the second export pipeline of first duplex pump is established ties and is opened and closed the valve, temporary storage structure is butt joint in spraying the structure.
By adopting the technical scheme, the tank body for loading the emulsified asphalt is arranged on the vehicle body, the output structure for outputting the emulsified asphalt and the spraying structure for spraying the emulsified asphalt are arranged, so that the emulsified asphalt is transferred from the tank body to the road surface; and the first duplex pump that sets up makes the jar body possess the storage emulsified asphalt ability, drives the flow of emulsified asphalt in the return circuit that the first duplex pump formed in the upper and lower floor of the jar body realization jar body, realizes that the internal emulsified asphalt of jar is in upper and lower floor between the circulation removal, indirect realization is to the stirring of emulsified asphalt to ensure that its inside pitch keeps the emulsification state.
Optionally, the temporary storage structure comprises a pre-storage tank and a second duplex pump, the second outlet of the first duplex pump is communicated with the pre-storage tank through a pipeline, an on-off valve is connected in series on the pipeline between the first duplex pump and the pre-storage tank, the inlet of the second duplex pump is also communicated with the pre-storage tank through a pipeline, an on-off valve is connected in series on the pipeline between the first duplex pump and the pre-storage tank, the second outlet of the second duplex pump is connected with the spraying structure through a pipeline in a butt joint mode, and the on-off valve is connected in series on the pipeline at the second outlet.
Through adopting above-mentioned technical scheme, set up the case that prestores to realize that the emulsified asphalt who exports in the follow jar body is in the case that prestores buffering and is preserved, ensure the pressure stability when exporting to spraying the structure, formed the circulation loop between the second duplex pump that sets up simultaneously, the case that prestores and the first duplex pump, drive through each duplex pump and circulate with driving the incasement emulsified asphalt that prestores, prevent that emulsified asphalt among them from taking place the emulsion breaking.
Optionally, still be provided with rabbling mechanism on the case that prestores, rabbling mechanism including fixed set up in drive motor on the case that prestores and install stirring vane's (mixing) shaft, the (mixing) shaft with the coaxial fixed connection of driving motor's pivot, the (mixing) shaft runs through along the direction of gravity the lateral wall of case that prestores, and stirring vane arranges in the case inside that prestores.
Through adopting above-mentioned technical scheme, the rabbling mechanism that sets up on the case that prestores, when the emulsified asphalt volume of the incasement that prestores is less, can't realize the circulation between the pump through the duplex, rotate through driving motor drive (mixing) shaft, indirect realization is to the emulsified asphalt stirring of the incasement that prestores, prevents its demulsification.
Optionally, the spraying structure includes a plurality of spray guns, mounting bracket and many outlet pipes, mounting bracket fixed connection in on the automobile body, a plurality of spray guns fixed connection in on the mounting bracket, and each spray gun spout all syntropy and towards the road surface setting, each export of many outlet pipes all communicates with each spray gun one by one, the second export of second duplex pump with the import of many outlet pipes passes through the pipeline intercommunication to establish ties on the pipeline between the two and open and close the valve.
Through adopting above-mentioned technical scheme, will follow the emulsified asphalt who pre-stores the incasement through many outlet pipes and carry in each spray gun to spray emulsified asphalt through the spray gun, the mounting bracket provides installation space for each spray gun.
Optionally, still be provided with liquid level detection device in the jar body, liquid level detection device including detect the buoy, vertical set up in slide rail of jar body lateral wall and be used for external personnel to detect the interior emulsified asphalt capacity's of jar acrylic inspection window, detect buoy sliding connection in on the slide rail, acrylic inspection window is always right detect the buoy, it has the scale to carve on the acrylic inspection window.
Through adopting above-mentioned technical scheme, through the liquid level detection device that sets up with the content of detecting the internal emulsified asphalt of jar, through detecting buoy in emulsified asphalt's liquid level come-up position to constraint through the slide rail, make the liquid level of emulsified asphalt that the staff through the acrylic inspection window can the visual inspection, and according to the scale on the acrylic inspection window, with the specific capacity of the internal emulsified asphalt of assurance jar.
Optionally, the case level of prestoreing is provided with and is used for with the case inner space of prestoreing is divided into the banding kickboard in emulsified asphalt storage chamber and air chamber, banding kickboard sliding connection in the case lateral wall of prestored, the (mixing) shaft runs through the banding kickboard, and stirring vane is located emulsified asphalt storage chamber one side, the case of prestored is located all the time and has seted up the atmospheric pressure balanced mouth on the lateral wall in air chamber one side.
Through adopting above-mentioned technical scheme, through set up banding kickboard in pre-storing the case, will pre-storing the case and divide into two each other not communicating parts, can change hydraulic energy into self heat energy through the emulsified asphalt of circulation between each duplex pump at the circulation in-process, indirectly make the emulsified asphalt volume in pre-storing the case take place to expand, through the gliding banding kickboard in order to compensate the change of emulsified asphalt volume, play the guard action to pre-storing the case.
In a second aspect, the present application provides a paving method according to the following technical solution:
a paving method comprising the steps of:
s1, paving a lower bearing layer, and performing gap filling, compaction, strickling and cleaning treatment on the lower bearing layer;
s2, spreading penetrating asphalt on the lower bearing layer;
s3, spreading main layer aggregate on the penetrating asphalt, and compacting;
s4, spreading joint compound on the main layer, and spreading main layer asphalt;
s5, spreading joint compound on the main layer asphalt again, and compacting the main layer;
s6, repeating the step S4 and the step S5 at least twice;
and S7, spreading a seal layer material on the main layer to form a seal layer.
Through adopting above-mentioned technical scheme, through the penetration method, set up penetrating layer pitch on the lower layer of bearing in order to play the seal effect, prevent infiltration of rainwater etc. and bear the layer under, lay behind the main layer, lay the multilayer again and constitute by pitch and joint compound reinforcement layer to improve waterproof performance and closely knit degree of road surface, and provide the protective layer for the road surface through the sealing material layer
Optionally, the step S7 includes the following steps:
s8: spreading a layer of asphalt on the main layer, and spreading a layer of sealing material;
s9: and (5) after asphalt is spread on the sealing layer, air gun membrane breaking is carried out, and asphalt spreading is carried out again.
Through adopting above-mentioned technical scheme, spread and spill after sealing the material layer, through spreading individual layer pitch and rupture of membranes, prevent that the oil film that forms on the road surface from making the pitch be difficult to pour into in the gap on road surface, lead to appearing great space region in the road surface, spread again and spill pitch in order to improve the closely knit degree of top seal, further improve the prevention performance to rainwater infiltration road surface inside.
In summary, the present application at least includes one of the following beneficial technical effects:
1. through the tank body, the output structure and the spraying structure which are arranged on the vehicle body, the emulsified asphalt is transferred from the tank body to the road surface, and when the first duplex pump is driven, a loop formed by the upper layer and the lower layer of the tank body and the inner cavity of the first duplex pump can be formed, so that the emulsified asphalt can flow in the loop, and the stirring of the emulsified asphalt is indirectly realized, so that the emulsified asphalt in the emulsified asphalt can be ensured to keep an emulsified state;
2. the emulsified asphalt who sets up to store in advance that the case can be followed the jar body and export is in advance the incasement buffering and is preserved, ensures the pressure stability when exporting to spraying the structure, has formed circulation loop between the second duplex pump that sets up simultaneously, prestoring case and the first duplex pump, circulates in order to drive the incasement emulsified asphalt that prestoring through the drive of each duplex pump, can only use the emulsified asphalt who prestoring incasement when using emulsified asphalt in the small dose to only need stir the emulsified asphalt who prestoring incasement, avoid stirring a large amount of emulsified asphalt in the jar body, thereby the energy saving.
Drawings
FIG. 1 is a schematic overall structure of an embodiment of the present application;
FIG. 2 is a schematic top view of a structure of an embodiment of the present application;
FIG. 3 is a schematic diagram of a first pump-tank first cycle in accordance with an embodiment of the present application;
FIG. 4 is a schematic illustration of an output structure and a spray structure of an embodiment of the present application;
fig. 5 is a schematic structural view of a liquid level detection device according to an embodiment of the present application.
Reference numerals illustrate:
1. a vehicle body; 2. a tank body; 21. an upper layer; 22. a lower layer; 3. an output structure; 31. a first tandem pump; 32. a temporary storage structure; 321. pre-storing a box; 322. a second duplex pump; 4. a spraying structure; 41. a spray gun; 42. a mounting frame; 43. a multiple outlet duct; 5. a connecting through hole; 6. a stirring mechanism; 61. a driving motor; 62. a stirring shaft; 7. a liquid level detection device; 71. detecting a buoy; 72. a slide rail; 73. an acrylic inspection window; 74. a graduated scale; 8. and sealing the edge of the floating plate.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-5.
The embodiment of the application discloses emulsified asphalt sprinkling equipment. Referring to fig. 1 and 2, an emulsified asphalt spreading apparatus includes a vehicle body 1, a tank 2 for accommodating emulsified asphalt is fixedly provided on the vehicle body 1, and the tank 2 is long and horizontally provided on the vehicle body 1; referring to fig. 2 and 3, a partition plate is arranged in the tank body 2 along the horizontal direction, the inner space of the tank body 2 is divided into an upper layer 21 and a lower layer 22 by the partition plate, a connecting through hole 5 for communicating the upper layer 21 and the lower layer 22 is formed at one end of the partition plate, which is close to the tank body 2, so that a transverse U-shaped channel is formed in the inner space of the tank body 2, an output structure 3 is further arranged outside the vehicle body 1, the output structure 3 comprises a first duplex pump 31 and a temporary storage structure 32 which are fixed on the vehicle body 1, an inlet of the first duplex pump 31 is communicated with one side, far from the connecting through hole 5, of the lower layer 22 of the tank body 2 through a pipeline, an opening and closing valve is connected in series on the pipeline between the inlet of the first duplex pump 31 and the upper layer 21, one side, far from the connecting through hole 5, is communicated through the pipeline, and the opening and closing valve is connected in series on the pipeline between the first duplex pump 31 and the upper layer 21.
Referring to fig. 1 and 2, the temporary storage structure 32 includes a pre-storage tank 321 having a volume smaller than that of the tank body 2 and a second duplex pump 322, the pre-storage tank 321 is rectangular and horizontally arranged, a second outlet of the first duplex pump 31 is connected with the pre-storage tank 321 through a pipeline, an on-off valve is connected in series with the pipeline between the two, an inlet of the second duplex pump 322 is connected with one side of the pre-storage tank 321 through a pipeline, a first outlet of the second duplex pump is also connected with the other side of the pre-storage tank 321 through a pipeline, and an on-off valve is connected in series with the pipeline between the two.
The spraying structure 4 comprises a plurality of spray guns 41, a U-shaped mounting frame 42 and a plurality of dendritic outlet pipelines 43, wherein two ends of the mounting frame 42 are welded at the tail of the vehicle body 1, the spray guns 41 are arranged in the same direction along a line and the road width and fixedly connected to the mounting frame 42, the spray nozzles of the spray guns 41 are vertically downwards arranged, the outlets of the plurality of outlet pipelines 43 are communicated with the spray guns 41 in a one-to-one correspondence manner through pipelines, and the second outlet of the second duplex pump 322 is communicated with the inlets of the plurality of outlet pipelines 43 through pipelines, and an on-off valve is connected in series on the pipeline between the two.
Through the arrangement, a stirring loop is formed between the U-shaped cavity in the tank body 2 and the first duplex pump 31, and a stirring loop is formed between the pre-storage cavity and the second duplex pump 322, so that the emulsified asphalt at each position can be stirred and circulated, the demulsification degree of the emulsified asphalt is reduced, and the basic spraying of the emulsified asphalt can be realized through the tank body 2, the output structure 3 and the spraying structure 4.
Referring to fig. 4, a sealed floating plate 8 for dividing the internal space of the pre-storing box 321 into two independent emulsified asphalt storage cavities and air cavities is horizontally arranged in the pre-storing box 321, the sealed floating plate 8 is slidably connected to the side wall of the pre-storing box 321, and an air pressure balance port is formed in the side wall of the pre-storing box 321, which is always located at one side of the air cavity.
Still be provided with rabbling mechanism 6 on the case 321 that prestores, rabbling mechanism 6 is including fixedly set up in the driving motor 61 of case 321 upper surface that prestores and install stirring vane and the (mixing) shaft 62 of vertical setting, coaxial fixed connection of (mixing) shaft 62 and driving motor 61's pivot, and (mixing) shaft 62 runs through the upper surface of case 321 that prestores along the direction of gravity, and (mixing) shaft 62 also runs through banding kickboard 8 simultaneously, and stirring vane is located emulsified asphalt storage chamber one side all the time.
Referring to fig. 1 and 5, a liquid level detecting device 7 is further disposed in the tank 2, the liquid level detecting device 7 includes a detecting buoy 71, a sliding rail 72 vertically disposed on a side wall of the tank 2, and an acrylic detecting window 73 vertically disposed, the detecting buoy 71 moves up and down along with the change of the liquid level in the tank 2, and is limited and slidingly connected to the sliding rail 72 along the vertical direction, the acrylic detecting window 73 is always opposite to the detecting buoy 71, and a scale 74 for displaying the corresponding liquid level is engraved on the acrylic detecting window 73.
The implementation principle of the emulsified asphalt spraying equipment provided by the embodiment of the application is as follows: the emulsified asphalt is poured into the tank body 2 from the material pouring opening of the tank body 2, a certain space is reserved in the tank body 2, and is stored, when the emulsified asphalt is required to be used, the first duplex pump 31 is driven to enable the emulsified asphalt to circularly flow between the tank body 2 and the first duplex pump 31, then circulation stirring is stopped, the emulsified asphalt in the tank body 2 is conveyed into the pre-storing box 321, and then the emulsified asphalt is conveyed into the spray gun 41 from the pre-storing box 321 through the second duplex pump 322 for spraying.
The embodiment of the application also discloses a paving method, which comprises the following steps:
s1, paving a cement lower bearing layer by taking a base layer as a foundation, and performing gap filling, compaction, strickling and cleaning treatment on the cement lower bearing layer to ensure that the lower bearing layer is horizontally seamless;
s2, uniformly sprinkling a small amount of water on the upper surface of the lower bearing layer, and spreading emulsified asphalt with one side serving as a penetrating layer on the upper surface of the lower bearing layer through an asphalt sprinkling truck;
s3, spreading main layer aggregate on the upper surface of the permeable layer, and horizontally compacting the main layer by a road roller;
s4, spreading joint compound on the main layer, and spraying emulsified asphalt on the upper surface of the main layer through an asphalt spreading vehicle so as to reduce excessive infiltration of the emulsified asphalt into gaps of the main layer;
s5, spreading joint compound on the main layer asphalt again, and compacting the main layer;
s6, repeating the step S4 and the step S5 twice to form a multi-layer main layer;
s7, spreading emulsified asphalt serving as an adhesive layer on the upper surface of the main layer, and spreading a layer of sealing layer material;
s8, spraying emulsified asphalt again on the sealing layer, then performing air gun membrane breaking, and spreading asphalt again.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (4)
1. An emulsified asphalt distribution device, characterized in that: the device comprises a vehicle body (1), wherein a tank body (2) for containing emulsified asphalt, an output structure (3) for outputting the emulsified asphalt in the tank body (2) and a spraying structure (4) for spraying the emulsified asphalt are arranged on the vehicle body (1), the tank body (2) is divided into an upper layer (21) and a lower layer (22) along the length direction of the tank body by a partition plate, one end of the partition plate, which is close to the tank body (2), is provided with a connecting through hole (5) communicated with the upper layer (21) and the lower layer (22), the output structure (3) comprises a first duplex pump (31) and a temporary storage structure (32), the inlet of the first duplex pump (31) is communicated with one side, which is far away from the connecting through hole (5), of the lower layer (22) through a pipeline, an on-off valve is connected in series with one side, which is far away from the connecting through the upper layer (21), of the upper layer (5) through the pipeline, of the first duplex pump (31) is communicated with the first duplex pump (32), the first duplex pump (31) is connected with the first duplex pump (32) through the pipeline, and the first duplex pump (32) is connected with the first duplex pump (32) in series and the first duplex pump (32) through the pipeline;
the temporary storage structure (32) comprises a pre-storage tank (321) and a second duplex pump (322), a second outlet of the first duplex pump (31) is communicated with the pre-storage tank (321) through a pipeline, an on-off valve is connected in series on the pipeline between the two, an inlet of the second duplex pump (322) is communicated with the pre-storage tank (321), a first outlet of the second duplex pump is also communicated with the pre-storage tank (321) through a pipeline, an on-off valve is connected in series on the pipeline between the two, a second outlet of the second duplex pump is connected with the spraying structure (4) in a butt joint way through a pipeline, and the on-off valve is connected in series on the pipeline at the second outlet;
still be provided with rabbling mechanism (6) on prestoring case (321), rabbling mechanism (6) including fixed set up in driving motor (61) on prestoring case (321) and install stirring vane's (62), (62) with coaxial fixed connection of pivot of driving motor (61), (62) run through along the direction of gravity prestoring case (321) lateral wall, and stirring vane arranges in prestoring case (321) are inside.
2. An emulsified asphalt distribution apparatus according to claim 1, wherein: the spraying structure (4) comprises a plurality of spray guns (41), a mounting frame (42) and a plurality of outlet pipelines (43), wherein the mounting frame (42) is fixedly connected to the vehicle body (1), the spray guns (41) are fixedly connected to the mounting frame (42), the spray guns (41) are all in the same direction and are arranged towards a road surface, the outlets of the plurality of outlet pipelines (43) are all communicated with the spray guns (41) one by one, the second outlet of the second duplex pump (322) is communicated with the inlets of the plurality of outlet pipelines (43) through pipelines, and valves are opened and closed in series on the pipelines between the two.
3. An emulsified asphalt distribution apparatus according to claim 1, wherein: still be provided with liquid level detection device (7) in jar body (2), liquid level detection device (7) including detect buoy (71), vertical set up in slide rail (72) of jar body (2) lateral wall and be used for external personnel to detect acrylic inspection window (73) of emulsified asphalt capacity in jar body (2), detect buoy (71) sliding connection in on slide rail (72), acrylic inspection window (73) are always right detect buoy (71), it has scale (74) to carve on acrylic inspection window (73).
4. An emulsified asphalt distribution apparatus according to claim 1, wherein: the utility model discloses a emulsified asphalt storage device, including pre-storing case (321), stirring axle (62), stirring vane, pre-storing case (321) inner space, sealed floating plate (8) that is used for will pre-storing case (321) inner space divide into emulsified asphalt storage chamber and air chamber, sealed floating plate (8) sliding connection in pre-storing case (321) lateral wall, (62) run through sealed floating plate (8), and stirring vane is located emulsified asphalt storage chamber one side, pre-storing case (321) is located all the time and has seted up the atmospheric pressure balanced mouth on the lateral wall of air chamber one side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210142742.2A CN114319020B (en) | 2022-02-16 | 2022-02-16 | Emulsified asphalt sprinkling equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210142742.2A CN114319020B (en) | 2022-02-16 | 2022-02-16 | Emulsified asphalt sprinkling equipment |
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| Publication Number | Publication Date |
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| CN114319020A CN114319020A (en) | 2022-04-12 |
| CN114319020B true CN114319020B (en) | 2023-05-02 |
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| CN202210142742.2A Active CN114319020B (en) | 2022-02-16 | 2022-02-16 | Emulsified asphalt sprinkling equipment |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3721302B2 (en) * | 2000-09-26 | 2005-11-30 | 前田道路株式会社 | Asphalt emulsion spray rate controller |
| CN108221562A (en) * | 2018-03-14 | 2018-06-29 | 山推建友机械股份有限公司 | A kind of cold in-plant recycling equipment emulsified asphalt feed system |
| CN111778054A (en) * | 2020-06-24 | 2020-10-16 | 国家电网公司 | Asphalt melting tank and asphalt melting and mixing process |
| CN215405513U (en) * | 2021-08-06 | 2022-01-04 | 重庆朋林工程技术服务有限公司 | Asphalt gap filling machine |
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2022
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