CN110107242B - Rotary excavating machine muck collecting and lifting device - Google Patents
Rotary excavating machine muck collecting and lifting device Download PDFInfo
- Publication number
- CN110107242B CN110107242B CN201910446890.1A CN201910446890A CN110107242B CN 110107242 B CN110107242 B CN 110107242B CN 201910446890 A CN201910446890 A CN 201910446890A CN 110107242 B CN110107242 B CN 110107242B
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- slag
- slag soil
- hopper
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- lifting
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- 239000002893 slag Substances 0.000 claims abstract description 61
- 239000002689 soil Substances 0.000 claims abstract description 57
- 230000007246 mechanism Effects 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims description 23
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 6
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 6
- 241001330002 Bambuseae Species 0.000 claims description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 6
- 239000011425 bamboo Substances 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 abstract description 31
- 230000000712 assembly Effects 0.000 abstract description 7
- 238000000429 assembly Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 description 9
- 230000009471 action Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004801 process automation Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B27/00—Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, baskets or buckets for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B27/00—Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, baskets or buckets for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
- E21B27/04—Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, baskets or buckets for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits where the collecting or depositing means include helical conveying means
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a slag soil collecting and lifting device of a rotary excavator, which comprises a frame, a hopper and a slag soil lifting assembly, wherein the frame is connected with the hopper, the hopper and the slag soil lifting assembly are respectively provided with a plurality of hoppers and the slag soil lifting assembly which are in one-to-one correspondence, a feed inlet is arranged at the bottom of the slag soil lifting assembly and is connected with a slag soil collecting mechanism, a discharge outlet communicated with the hopper is arranged at the top of the slag soil lifting assembly, the plurality of slag soil lifting assemblies are connected with a revolution driving mechanism, the slag soil lifting assemblies rotate around the central line of the frame under the driving of the revolution driving mechanism, and the slag soil collecting mechanism collects slag soil in the rotating process. The device can automatically collect and lift the dregs generated by drilling of the rotary drilling rig into the hole, so that the dregs can be quickly cleaned, and continuous drilling of the rotary drilling rig is facilitated.
Description
Technical Field
The invention relates to the field of mountain construction equipment, in particular to a slag soil collecting and lifting device of a rotary excavating machine.
Background
The rotary drilling rig is a construction machine suitable for hole forming operation in building foundation engineering. The drilling machine generally adopts a hydraulic crawler type telescopic chassis, a self-lifting foldable drilling mast, a telescopic drill rod, automatic detection and adjustment of verticality, digital display of hole depth and the like, and the whole machine operation generally adopts hydraulic pilot control and load sensing and is suitable for dry or wet type and rock stratum hole forming operation by matching with different drilling tools. The device can also be matched with a long spiral drill, an underground continuous wall grab bucket, a vibrating pile hammer and the like to realize multiple functions, and is mainly used for the foundation construction of municipal construction, highway bridges, industrial and civil buildings, underground continuous walls, water conservancy, anti-seepage slope protection and the like. The slag soil cut by the drill bit of the rotary drilling rig is gathered in the pore channel, and if the slag soil is not cleaned, the continuous drilling of the drilling tool is influenced.
Disclosure of Invention
In order to solve the technical problem, the invention discloses a slag collecting and lifting device of a rotary drilling rig, which can automatically collect and lift slag generated by drilling of the rotary drilling rig out of a hole channel, realize quick cleaning of the slag and is beneficial to continuous drilling of the rotary drilling rig.
The invention is realized by the following technical scheme:
hoisting device is collected to excavator dregs soon, including frame, hopper and dregs lifting unit, the frame links to each other with the hopper, hopper and dregs lifting unit are the several, and hopper and dregs lifting unit one-to-one, and dregs lifting unit bottom is equipped with the feed inlet, the feed inlet is connected with dregs and collects the mechanism, and the top is equipped with the bin outlet with the hopper intercommunication, and several dregs lifting unit links to each other with a revolution actuating mechanism, and dregs lifting unit is rotatory around the frame central line under the revolution actuating mechanism drive, and dregs collection mechanism collects dregs at rotatory in-process.
According to the invention, the muck collecting mechanism collects muck during rotation, the muck enters the muck lifting assembly from the feeding hole, the muck lifting assembly upwards conveys the muck and finally discharges the muck from the discharging hole of the muck lifting assembly into the hopper, the rack is connected with the lifting equipment of the rotary drilling rig, the whole lifting device is lifted after the hopper is full of the muck, the muck is poured out, the automation of the whole muck collecting process is high, the muck is effectively discharged, the drilling of a drilling tool of the rotary drilling rig is facilitated, and the drilling efficiency is improved.
The muck lifting assembly comprises a transmission cylinder and an auger, the auger is arranged in the transmission cylinder, the top of the transmission cylinder is provided with an auger driving device, and the top of the auger penetrates through the transmission cylinder to be connected with the auger driving device.
Further, the feed inlet sets up in transmission section of thick bamboo lateral wall bottom, and the bin outlet sets up in transmission section of thick bamboo lateral wall top.
According to the invention, when the whole lifting device revolves around the central line of the rack, the auger is in self-transmission under the action of the auger driving device, the collection, lifting and storage of the muck are realized, the muck collection efficiency is high, the muck collection mechanism is used for collecting the muck in the whole pore passage in a rotating manner, the collection and discharge of the muck in the whole pore passage are facilitated, and the cleaning is more thorough.
Furthermore, a bearing seat is fixedly arranged on the bottom plate and the top plate of the transmission cylinder respectively, and two ends of the packing auger are movably connected with the bearing seats through bearings.
Furthermore, the cross-section of the muck collecting mechanism is arc-shaped and is obliquely arranged, the bottom of the muck collecting mechanism is communicated with the feed inlet of the conveying cylinder, and the feed inlet is arranged on one side, away from the central line of the rack, of the conveying cylinder.
According to the invention, the section of the muck collecting mechanism is arc-shaped, muck is effectively shoveled in the rotating process, and the muck collecting mechanism is obliquely arranged and the bottom of the muck collecting mechanism is communicated with the feeding hole of the conveying cylinder, so that muck entering the muck collecting mechanism automatically enters the feeding hole of the conveying cylinder under the action of self gravity and is upwards conveyed into the hopper through the auger, and the muck collecting mechanism can convey muck to the feeding hole of the conveying cylinder without external force, so that the energy conservation and the low consumption are realized.
Furthermore, the hopper is provided with a material collecting cavity, the section of the material collecting cavity is arc-shaped, a plurality of hoppers surround a ring cavity, and a plurality of residue soil lifting assemblies are arranged in the ring cavity.
Furthermore, the bottom of the rack is connected with the top of the hopper, and the top of the rack is used for being connected with a hoisting device.
The central line of the frame is connected with a vertical rod, the bottom of the vertical rod is fixedly connected with a revolution frame, the revolution frame is provided with a plurality of horizontal plates which are uniformly distributed around the vertical rod, and the tail ends of the horizontal plates are fixedly connected with a muck lifting assembly.
Furthermore, the top of the vertical rod is used for being connected with a revolution driving mechanism, and the revolution driving mechanism is one of a motor and a hydraulic motor.
According to the invention, the revolution driving mechanism can be independently arranged, and the same power source, namely a hydraulic motor, can be used with the rotary drilling rig.
Furthermore, the number of the hoppers and the muck lifting assemblies is 2-4.
Preferably, the number of the hoppers and the muck lifting assemblies is 2.
Further, the muck collecting mechanism is arranged below the hopper.
A rotary digging machine comprises the slag soil collecting and lifting device of the rotary digging machine.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the slag soil collecting and lifting device of the rotary drilling rig, the slag soil is collected by the slag soil collecting mechanism when the slag soil collecting mechanism rotates, the slag soil enters the slag soil lifting assembly from the feeding hole, the slag soil lifting assembly upwards conveys the slag soil and finally discharges the slag soil from the discharging hole of the slag soil lifting assembly into the hopper, the rack is connected with the lifting equipment of the rotary drilling rig, the whole lifting device is conveniently lifted after the hopper is full of the slag soil, the slag soil is poured out, the automation of the whole slag soil collecting process is high, the slag soil is effectively discharged, continuous drilling of a drilling tool of the rotary drilling rig is facilitated, and the drilling efficiency is improved;
2. according to the residue soil collecting and lifting device of the rotary excavator, the auger automatically transmits under the action of the auger driving device while the whole lifting device revolves around the central line of the frame, residue soil collection, lifting and storage are realized, the residue soil collecting efficiency is high, the residue soil collecting mechanism collects the residue soil in a rotating manner, the residue soil in the whole pore channel is collected and discharged, and the cleaning is more thorough;
3. according to the slag soil collecting and lifting device of the rotary excavator, the section of the slag soil collecting mechanism is arc-shaped, the slag soil is effectively shoveled in the rotating process, and the slag soil entering the slag soil collecting mechanism automatically enters the feeding port of the conveying cylinder under the action of self gravity and is upwards conveyed into the hopper through the auger because the slag soil collecting mechanism is obliquely arranged and the bottom of the slag soil collecting mechanism is communicated with the feeding port of the conveying cylinder, so that the slag soil can be conveyed to the feeding port of the conveying cylinder without external force, and the energy conservation and the low consumption are realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments 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 principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the frame and hopper of the present invention;
figure 3 is a schematic diagram of a ring cavity of the present invention.
Reference numbers and corresponding part names in the drawings:
the method comprises the following steps of 1-a rack, 2-a hopper, 21-a material collecting cavity, 3-a muck lifting component, 31-a material inlet, 32-a material outlet, 33-a transmission cylinder, 34-an auger, 35-an auger driving device, 4-a muck collecting mechanism, 5-a bearing seat, 6-an annular cavity, 7-a vertical rod and 8-a horizontal plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1-3, the muck collecting and lifting device of the rotary excavator comprises a frame 1, a hopper 2 and muck lifting components 3, wherein the frame 1 is connected with the hopper 2, the hopper 2 and the muck lifting components 3 are respectively provided with a plurality of hoppers 2 and muck lifting components 3, the hoppers 2 and the muck lifting components 3 are in one-to-one correspondence, a feed port 31 is arranged at the bottom of each muck lifting component 3, the feed port 31 is connected with a muck collecting mechanism 4, the top of each muck lifting component is provided with a discharge port 32 communicated with the hopper 2, the muck lifting components 3 are connected with a revolution driving mechanism, the muck lifting components 3 are driven by the revolution driving mechanism to rotate around the central line of the frame 1, and the muck collecting mechanism 4.
The muck lifting component 3 comprises a transmission cylinder 33 and an auger 34, the auger 34 is arranged in the transmission cylinder 33, the top of the transmission cylinder 33 is provided with an auger driving device 35, and the top of the auger 34 penetrates through the transmission cylinder 33 to be connected with the auger driving device 35.
Further, the feed inlet 31 is arranged at the bottom of the side wall of the conveying cylinder 33, and the discharge outlet 32 is arranged at the top of the side wall of the conveying cylinder 33.
Furthermore, a bearing seat 5 is fixedly arranged on a bottom plate and a top plate of the transmission cylinder 33 respectively, and two ends of the packing auger 34 are movably connected with the bearing seats 5 through bearings.
Further, the cross-section of the muck collecting mechanism 4 is arc-shaped and is obliquely arranged, the bottom of the muck collecting mechanism is communicated with the feed inlet 31 of the conveying cylinder 33, and the feed inlet 31 is arranged on one side, away from the central line of the rack 1, of the conveying cylinder 33.
Furthermore, hopper 2 is equipped with the material collecting cavity 21, and the material collecting cavity 21 cross-section is arc, and a plurality of hopper 2 encloses into an annular chamber 6, and several dregs lifting unit 3 sets up in annular chamber 6.
Further, the bottom of the frame 1 is connected with the top of the hopper 2, and the top of the frame is used for being connected with a hoisting device. The central line of the frame 1 is connected with a vertical rod 7, the bottom of the vertical rod 7 is fixedly connected with a revolution frame, the revolution frame is provided with a plurality of horizontal plates 8 which are uniformly distributed around the vertical rod 7, and the tail ends of the horizontal plates 8 are fixedly connected with the muck lifting assembly 3.
Further, the number of the hoppers 2 and the muck lifting assemblies 3 is 2-4.
Example 2
As shown in fig. 1-3, the muck collecting and lifting device of the rotary excavator comprises a frame 1, a hopper 2 and muck lifting components 3, wherein the frame 1 is connected with the hopper 2, the hopper 2 and the muck lifting components 3 are respectively provided with a plurality of hoppers 2 and muck lifting components 3, the hoppers 2 and the muck lifting components 3 are in one-to-one correspondence, a feed port 31 is arranged at the bottom of each muck lifting component 3, the feed port 31 is connected with a muck collecting mechanism 4, the top of each muck lifting component is provided with a discharge port 32 communicated with the hopper 2, the muck lifting components 3 are connected with a revolution driving mechanism, the muck lifting components 3 are driven by the revolution driving mechanism to rotate around the central line of the frame 1, and the muck collecting mechanism 4.
The muck lifting component 3 comprises a transmission cylinder 33 and an auger 34, the auger 34 is arranged in the transmission cylinder 33, the top of the transmission cylinder 33 is provided with an auger driving device 35, and the top of the auger 34 penetrates through the transmission cylinder 33 to be connected with the auger driving device 35.
Further, the feed inlet 31 is arranged at the bottom of the side wall of the conveying cylinder 33, and the discharge outlet 32 is arranged at the top of the side wall of the conveying cylinder 33.
Furthermore, a bearing seat 5 is fixedly arranged on a bottom plate and a top plate of the transmission cylinder 33 respectively, and two ends of the packing auger 34 are movably connected with the bearing seats 5 through bearings.
Further, the cross-section of the muck collecting mechanism 4 is arc-shaped and is obliquely arranged, the bottom of the muck collecting mechanism is communicated with the feed inlet 31 of the conveying cylinder 33, and the feed inlet 31 is arranged on one side, away from the central line of the rack 1, of the conveying cylinder 33.
Furthermore, hopper 2 is equipped with the material collecting cavity 21, and the material collecting cavity 21 cross-section is arc, and a plurality of hopper 2 encloses into an annular chamber 6, and several dregs lifting unit 3 sets up in annular chamber 6.
Further, frame 1 bottom links to each other with 2 tops of hopper, and the top is used for with lift by crane equipment and be connected, and frame 1 central line department is connected with a vertical pole 7, and a revolution frame is erected in 7 bottom fixed connection of vertical pole, and revolution frame is equipped with several horizontal plates 8 around vertical pole 7 evenly distributed, and horizontal plate 8 end and dregs lifting unit 3 fixed connection.
Further, the top of the vertical rod 7 is used for being connected with a revolution driving mechanism, and the revolution driving mechanism is one of a motor and a hydraulic motor.
Further, the number of the hoppers 2 and the muck lifting assemblies 3 is 2.
Further, the muck collecting mechanism 4 is arranged below the hopper 2.
The dregs are collected to mechanism 4 when rotatory, and the dregs get into in dregs lifting unit 3 from feed inlet 31, and dregs lifting unit 3 upwards transmits the dregs and finally discharges from its bin outlet 32 and get into hopper 2, frame 1 is used for linking to each other with the equipment of lifting by crane of digging the rig soon, and the hopper 2 of being convenient for is collected and is hoisted whole hoisting device after full dregs, pours out the dregs, and whole dregs are collected process automation is high, effectively discharges the dregs, is favorable to digging the rig drilling tool soon and lasts the drilling, improves drilling efficiency.
It should be noted that fig. 1 to 3 show different configurations of the housing 1 in the two embodiments. The main effect of frame 1 in this application is that the hoisting equipment who links to each other hopper 2, dregs lifting unit 3 isotructure and dig the rig soon, and the rig that is convenient for dig soon hangs it up, consequently, as long as can realize the same effect, this application does not specifically limit to its structure.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The slag soil collecting and lifting device of the rotary excavator is characterized by comprising a rack (1), a hopper (2) and slag soil lifting components (3), wherein the rack (1) is connected with the hopper (2), the hopper (2) and the slag soil lifting components (3) are multiple, the hopper (2) and the slag soil lifting components (3) correspond to each other one by one, a feed inlet (31) is formed in the bottom of the slag soil lifting components (3), the feed inlet (31) is connected with a slag soil collecting mechanism (4), a discharge hole (32) communicated with the hopper (2) is formed in the top of the slag soil lifting components, the slag soil lifting components (3) are connected with a revolution driving mechanism, the slag soil lifting components (3) rotate around the central line of the rack (1) under the driving of the revolution driving mechanism, and the slag soil collecting mechanism (4) collects slag soil in the rotating process;
dregs lifting unit (3) are including a transmission section of thick bamboo (33) and auger (34), and auger (34) set up in a transmission section of thick bamboo (33), and a transmission section of thick bamboo (33) top is equipped with auger drive arrangement (35), and auger (34) top is passed a transmission section of thick bamboo (33) and is linked to each other with auger drive arrangement (35).
2. The rotary excavating machine slag collecting and lifting device according to claim 1, characterized in that the feed inlet (31) is arranged at the bottom of the side wall of the conveying cylinder (33), and the discharge outlet (32) is arranged at the top of the side wall of the conveying cylinder (33).
3. The rotary excavating machine muck collecting and lifting device according to claim 1, wherein a bearing seat (5) is fixedly arranged on a bottom plate and a top plate of the transmission cylinder (33), and two ends of the packing auger (34) are movably connected with the bearing seats (5) through bearings.
4. The slag collecting and lifting device of the rotary excavator according to claim 1, wherein the slag collecting mechanism (4) is arc-shaped in cross section and is obliquely arranged, the bottom of the slag collecting mechanism is communicated with a feed port (31) of the conveying cylinder (33), and the feed port (31) is arranged on one side of the conveying cylinder (33) far away from the center line of the machine frame (1).
5. The rotary excavating machine slag collecting and lifting device according to claim 1, characterized in that the hopper (2) is provided with a collecting cavity (21), the section of the collecting cavity (21) is in a circular arc shape, a plurality of hoppers (2) enclose an annular cavity (6), and a plurality of slag lifting components (3) are arranged in the annular cavity (6).
6. The slag soil collecting and lifting device of the rotary excavator according to claim 1, wherein the bottom of the frame (1) is connected with the top of the hopper (2), the top of the frame is used for being connected with a hoisting device, a vertical rod (7) is connected to the center line of the frame (1), the bottom of the vertical rod (7) is fixedly connected with a revolution frame, the revolution frame is provided with a plurality of horizontal plates (8) which are uniformly distributed around the vertical rod (7), and the tail ends of the horizontal plates (8) are fixedly connected with the slag soil lifting assembly (3).
7. The rotary excavating machine muck collecting and lifting device according to claim 6, wherein the top of the vertical rod (7) is used for connecting with a revolution driving mechanism, and the revolution driving mechanism is one of an electric motor and a hydraulic motor.
8. The rotary excavator slag collection lifting device according to claim 1, wherein the number of the hopper (2) and the slag lifting assembly (3) is 2-4.
9. A rotary excavating machine comprising the rotary excavating machine muck collection lifting device of any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910446890.1A CN110107242B (en) | 2019-05-27 | 2019-05-27 | Rotary excavating machine muck collecting and lifting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910446890.1A CN110107242B (en) | 2019-05-27 | 2019-05-27 | Rotary excavating machine muck collecting and lifting device |
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| Publication Number | Publication Date |
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| CN110107242A CN110107242A (en) | 2019-08-09 |
| CN110107242B true CN110107242B (en) | 2021-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910446890.1A Active CN110107242B (en) | 2019-05-27 | 2019-05-27 | Rotary excavating machine muck collecting and lifting device |
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| CN (1) | CN110107242B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117108276B (en) * | 2023-10-24 | 2023-12-19 | 烟台鲁东勘察测绘有限公司 | Drilling device for hydraulic loop geological survey |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5947633A (en) * | 1998-03-11 | 1999-09-07 | Foss; Milton K. | Adjustable cover removing and installing tool |
| CN204110811U (en) * | 2014-07-29 | 2015-01-21 | 大连天晟通用机械有限公司 | A kind of spiral vertical elevator |
| CN104265156A (en) * | 2014-08-13 | 2015-01-07 | 国家电网公司 | Digging and soil lifting device for plateau mountain foundation pit digging construction equipment |
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| CN110107242A (en) | 2019-08-09 |
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