CN111894058A - Rock crushing harrow head - Google Patents
Rock crushing harrow head Download PDFInfo
- Publication number
- CN111894058A CN111894058A CN202010740283.9A CN202010740283A CN111894058A CN 111894058 A CN111894058 A CN 111894058A CN 202010740283 A CN202010740283 A CN 202010740283A CN 111894058 A CN111894058 A CN 111894058A
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- head
- rock breaking
- rock
- harrow
- teeth
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- 239000011435 rock Substances 0.000 title claims abstract description 180
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 13
- 238000010276 construction Methods 0.000 abstract description 10
- 239000002689 soil Substances 0.000 description 13
- 230000005540 biological transmission Effects 0.000 description 9
- 239000003921 oil Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 241001427932 Bothragonus swanii Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
- E02F3/92—Digging elements, e.g. suction heads
- E02F3/9256—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/28—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways
- E02F5/282—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways with rotating cutting or digging tools
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a rock breaking harrow head which is used for underwater rock breaking operation and comprises a harrow head body, harrow teeth, a harrow head suction port and a rock breaking device, wherein the harrow teeth, the harrow head suction port and the rock breaking device are arranged on the harrow head body and are sequentially arranged along the operation advancing direction of the harrow head body, and the rock breaking device comprises a rock breaking head with the rock breaking teeth and a driving mechanism for driving the rock breaking head to move up and down. The rock crushing harrow head is provided with a rock crushing device at one side of the operation advancing direction of the harrow teeth and the harrow head suction port, strong weathered rock or massive dredged objects are crushed by the rock crushing head of the rock crushing device in the operation process, and the crushed strong weathered rock or massive dredged objects pass through the harrow head suction port and the harrow teeth at the rear part, so that the condition that the harrow teeth and the massive dredged objects block the harrow head is reduced, and the construction efficiency is improved; and the detritus head can also move up and down to adapt to different dredging depths, so that the detritus head and the suction port of the drag head are ensured to be positioned at the same horizontal plane position in the operation process and can be simultaneously tightly attached to the underwater plane, and the adaptability of the drag head is improved.
Description
Technical Field
The invention relates to the technical field of dredging ship equipment, in particular to a rock crushing drag head.
Background
The large-scale drag suction ship has self-navigation capability, is suitable for deep sea sand taking, has high construction efficiency and strong wind wave adaptability, can be constructed particularly in a certain surge sea condition environment (such as south sea sand taking and island making engineering), but a key dredging machine-drag head of the drag suction ship can not strongly break harder rock soil, the dredging drag heads of all advanced and large-scale drag suction ships in the world at present only have drag and suction functions but do not have a crushing function, drag teeth can be broken when the existing drag heads meet the hard soil, and massive dredged objects can block a drag head suction inlet to form larger suction vacuum of a dredge pump, so that the damage of the dredge pump is caused, and the construction efficiency can be sharply reduced.
Disclosure of Invention
The invention aims to provide a rock crushing harrow head which can reduce the occurrence of harrow head broken teeth and blockage of a harrow head by large dredged objects and improve the construction efficiency.
In order to realize the purpose of the invention, the technical scheme is as follows:
the utility model provides a detritus rake head for the broken rock operation under water, this detritus rake head include the rake head body, and set up in the rake head body and along rake teeth, rake head suction inlet and the detritus device that its operation advancing direction arranged in proper order, the detritus device is including the detritus head that has the detritus tooth and the actuating mechanism that drives the detritus head and reciprocate.
The rock crushing harrow head is provided with a rock crushing device at one side of the operation advancing direction of the harrow teeth and the harrow head suction port, strong weathered rock or massive dredged objects are crushed by the rock crushing head of the rock crushing device in the operation process, and the crushed strong weathered rock or massive dredged objects pass through the harrow head suction port and the harrow teeth at the rear part, so that the condition that the harrow teeth and the massive dredged objects block the harrow head is reduced, and the construction efficiency is improved; and the detritus head can also be driven by a driving mechanism to move up and down to adapt to different dredging depths, so that the detritus head and the suction port of the drag head are in the same horizontal plane position in the operation process and can be tightly attached to the underwater plane at the same time, and the adaptability of the drag head is improved. In the actual use process, according to different seabed hard soil working conditions, the rock crushing teeth with different strengths are installed to crush hard rock soil, so that the seabed hard soil working condition adaptability of the drag head is improved.
The technical scheme is further explained as follows:
further, the driving mechanism comprises a supporting connecting frame and a first driving unit, wherein one end of the supporting connecting frame is rotatably connected with the drag head body, the first driving unit drives the supporting connecting frame to swing up and down, and the other end of the supporting connecting frame is connected with the rock breaking head. The first driving unit drives the supporting connecting frame to rotate around the drag head body, so that the rock breaking head can move up and down.
Further, the rock crushing device further comprises a connecting pipe and a trunnion, wherein the connecting pipe is connected with the drag head body and is coaxially arranged with the drag head body, the trunnion is arranged on the connecting pipe, and one end, far away from the rock crushing head, of the supporting connecting frame is hinged to the trunnion. The connecting pipe and the drag head body are coaxially arranged, so that when the angle between the axis of the drag head body and the plane of the seabed is adjusted, the angle adjustment of the rock breaking head is more convenient, and the operation is simpler; and the supporting and connecting frame is connected with the drag head body through the trunnion and the connecting pipe, so that the installation and the disassembly are convenient.
Furthermore, the rock breaking harrow head also comprises a limiting block, and the limiting block is arranged on the harrow head body and faces one side of the support connecting frame; when the support connecting frame is abutted to the limiting block, a distance exists between the rock crushing head and the drag head body. The utility model can prevent the broken rock head from damaging the harrow head body and prolong the service life.
Furthermore, the first driving unit comprises an oil cylinder fixed on the drag head body and a hydraulic rod with one end connected with the middle part of the support connecting frame. The hydraulic rod stretches and retracts to drive the support connecting frame to swing up and down, so that the rock crushing head can move up and down.
Further, the detritus head includes the detritus cylinder of level setting and drives the second drive unit that the detritus cylinder rotated, and the detritus tooth sets up in the outer wall of detritus cylinder. In the process of advancing operation, the second driving unit drives the rock crushing roller to rotate, so that the rock crushing teeth continuously crush the rock; and the rock breaking head is arranged in a roller mode, so that the rock breaking roller moves forwards along the seabed in a manner of clinging to the seabed, the complex seabed working condition is adapted, the applicability of the drag head is further improved, and the resistance is reduced.
Further, the outer wall of the rock crushing roller is provided with a plurality of rock crushing tooth groups which are arranged side by side along the axial direction of the rock crushing roller, and each rock crushing tooth group is provided with a plurality of rock crushing teeth which are arranged along the circumferential direction of the rock crushing roller. Further enhancing the rock breaking capacity of the drag head.
Further, the rock crushing teeth in each rock crushing tooth group are sequentially and forwards inclined along the rotation direction of the rock crushing roller. In the process of rotating and advancing the rock crushing roller, the rock crushing teeth can vertically contact with hard rock geology, and the optimal rock crushing effect is achieved.
Further, the rock crushing head further comprises tooth seats in one-to-one correspondence with the rock crushing teeth, the tooth seats are fixed on the rock crushing roller, and the rock crushing teeth are detachably connected with the corresponding tooth seats. The rock breaking teeth are fixed on the rock breaking roller through the tooth holder and detachably connected with the tooth holder, so that the daily maintenance and replacement of the rock breaking teeth are facilitated, and the rock breaking teeth are suitable for different seabed hard soil working conditions.
Further, the second driving unit comprises a transmission gear connected with the rock crushing roller and a hydraulic motor or an electric motor for driving the transmission gear to rotate.
Compared with the prior art, the invention has the following beneficial effects:
according to the rock crushing drag head, the rock crushing device is arranged on one side of the forward operation direction of the drag teeth and the drag head suction port, rocks are crushed through the rock crushing head of the rock crushing device in the operation process, and the crushed strongly weathered rocks or massive dredged objects pass through the drag head suction port and the drag teeth behind the rock crushing drag head, so that the condition that the drag heads are blocked by the drag teeth and the massive dredged objects is reduced, and the construction efficiency is improved; and the detritus head can also be driven by a driving mechanism to move up and down to adapt to different dredging depths, so that the detritus head and the suction port of the drag head are in the same horizontal plane position in the operation process and can be tightly attached to the underwater plane at the same time, and the adaptability of the drag head is improved. In the actual use process, according to different seabed hard soil working conditions, the rock crushing teeth with different strengths are installed to crush hard rock soil, so that the seabed hard soil working condition adaptability of the drag head is improved.
Drawings
Fig. 1 is a schematic view of a first working state of a rock breaking rake head according to an embodiment of the invention;
fig. 2 is a schematic view of a second working state of the rock breaking rake head according to the embodiment of the invention;
FIG. 3 is a schematic diagram of a rock breaking apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a rock breaking head according to an embodiment of the invention.
Description of reference numerals:
10. the rock breaking device comprises a drag head body, a flange, a drag tooth, a drag head suction port, a drag tooth, a drag head suction port, a rock breaking device, a rock breaking head, a rock breaking tooth, a rock breaking roller, a second driving unit, a transmission gear, a hydraulic motor, a gear seat, a driving mechanism, a supporting connecting frame, a first driving unit, a connecting pipe, a trunnion, a limiting block and a seabed plane, wherein the drag head body comprises 110, the flange, 20, the drag tooth, 30, the drag head suction.
Detailed Description
Embodiments of the present invention are described in detail below with reference to the accompanying drawings:
as shown in fig. 1 and 2, the rock breaking rake head is used for underwater rock breaking operation and comprises a rake head body 10, rake teeth 20, a rake head suction opening 30 and a rock breaking device 40, wherein the rake teeth 20, the rake head suction opening 30 and the rock breaking device 40 are arranged on the rake head body 10 and are sequentially arranged along the operation advancing direction of the rake head body, and the rock breaking device 40 comprises a rock breaking head 410 with rock breaking teeth 411 and a driving mechanism 420 for driving the rock breaking head 410 to move up and down.
The rock crushing harrow head is provided with a rock crushing device 40 at one side of the operation advancing direction of the harrow teeth 20 and the harrow head suction port 30, strong weathered rocks or massive dredged objects are crushed by the rock crushing head 410 of the rock crushing device 40 in the operation process, and the crushed strong weathered rocks or massive dredged objects pass through the harrow head suction port 30 and the harrow teeth 20 at the rear part, so that the condition that the harrow teeth 20 and the massive dredged objects block the harrow head is reduced, and the construction efficiency is improved; and the detritus head 410 can also be driven by the driving mechanism 420 to move up and down to adapt to different dredging depths, so that the detritus head 410 and the drag head suction port 30 are in the same horizontal plane position in the operation process and can be tightly attached to the underwater plane at the same time, and the adaptability of the drag head is improved. In the actual use process, according to different seabed hard soil working conditions, the rock crushing teeth 411 with different strengths are installed to crush hard rock soil, so that the seabed hard soil working condition adaptability of the drag head is improved. In this embodiment, the drag head can be constructed in a submarine environment of strong weathered rock and medium weathered rock of 30MPa to 50MPa, and the drag head can also replace different rock crushing teeth 411 to crush rock with different strengths according to actual needs.
As shown in fig. 1 to 3, the driving mechanism 420 includes a support link 421 having one end rotatably connected to the drag head body 10, and a first driving unit 422 for driving the support link 421 to swing up and down, and the other end of the support link 421 is connected to the rock breaking head 410. The first driving unit 422 drives the support link 421 to rotate around the drag head body 10, so that the rock breaking head 410 moves up and down.
In this embodiment, the first driving unit 422 includes an oil cylinder fixed on the drag head body 10 and a hydraulic rod with one end connected to the middle of the support link 421, and the support link 421 is driven to swing up and down by the extension and contraction of the hydraulic rod, so that the rock breaking head 410 moves up and down. The first driving unit 422 may be set to other driving modes according to actual needs.
As shown in fig. 1, the rock breaking rake head further includes a limiting block 50, and the limiting block 50 is disposed on the side of the rake head body 10 facing the support connecting frame 421. When the shallowest water is under construction, the included angle between the axis of the drag head body 10 and the seabed plane 60 is the smallest, the hydraulic rod of the adjusting oil cylinder is in the retraction position, and the support connecting frame 421 is in contact with the limiting block 50 at the moment, so that the rock breaking head 410 is prevented from hurting the drag head body 10. When in deep sea construction, the included angle between the axis of the drag head body 10 and the seabed plane 60 is increased, the hydraulic rod of the adjusting oil cylinder is in the extending position, and the crushing working surface of the rock crushing head 410 and the drag head suction port 30 are always in the same seabed plane 60, so that the construction efficiency is ensured.
As shown in fig. 1 to 3, the rock crushing device 40 further includes a connecting pipe 430 connected to the drag head body 10 and disposed coaxially with the axis of the drag head body 10, and a trunnion 440 disposed on the connecting pipe 430, wherein an end of the support connecting frame 421 away from the rock crushing head 410 is hinged to the trunnion 440. The connecting pipe 430 is coaxially arranged with the drag head body 10, so that when the angle between the axis of the drag head body 10 and the seabed plane 60 is adjusted, the angle adjustment of the rock breaking head 410 is more convenient, and the operation is simpler; and the support link 421 is connected with the drag head body 10 through the trunnion 440 and the connection pipe 430, so as to be convenient for installation and disassembly.
In this embodiment, the flange of the connecting pipe 430 is adapted to the mounting flange 110 of the existing drag head body 10, and is connected to the existing drag head body 10 into a whole by means of the connecting bolt, so as to facilitate the transformation of the existing drag head body 10, and the trunnion 440 is welded to the connecting pipe 430 by means of a reinforcing plate, and can also be integrally cast and formed with the connecting pipe 430.
As shown in fig. 3 and 4, the rock crushing head 410 includes a horizontally disposed rock crushing roller 412 and a second driving unit 413 for driving the rock crushing roller 412 to rotate, and the rock crushing teeth 411 are disposed on an outer wall of the rock crushing roller 412. During the operation, the second driving unit 413 drives the rock crushing roller 412 to rotate, so that the rock crushing teeth 411 continuously crush the rock; and the rock breaking head 410 is arranged in a roller mode, so that the rock breaking roller 412 moves forwards along the seabed in a manner of clinging to the seabed, the complex seabed working condition is adapted, the applicability of the rake head is further improved, and the resistance is reduced.
In the present embodiment, the second driving unit 413 includes a transmission gear 4131 connected to the rock crushing drum 412, and a hydraulic motor 4132 driving the transmission gear 4131 to rotate. The hydraulic motor 4132 and the transmission gear 4131 may be one set and installed at one end of the rock crushing roller 412, or two sets and installed at two ends of the roller body respectively, which is determined mainly according to the power of the hydraulic motor 4132 and the transmission gear 4131. The hydraulic oil pipe on the harrow arm pipe is connected to the hydraulic motor, and the hydraulic motor 4132 output power drives the detritus cylinder 412 to rotate at a high speed through the transmission gear 4131, thereby driving the detritus tooth 411 to impact the hard rock substrate at a high speed, and achieving the purpose of high-efficient detritus. The second driving unit 413 can also drive the transmission gear 4131 to rotate by using a motor according to actual needs, and electrically connect the cable on the rake arm pipe with the motor.
As shown in fig. 4, the outer wall of the rock crushing roller 412 is provided with a plurality of rock crushing tooth groups arranged side by side along the axial direction, and each rock crushing tooth group is provided with a plurality of rock crushing teeth 411 arranged along the circumferential direction of the rock crushing roller 412, so that the rock crushing capability of the rake head is further enhanced; and as shown in fig. 1 and 2, the rock crushing teeth 411 in each rock crushing tooth 411 group are arranged along the rotation direction of the rock crushing roller 412 in a forward tilting mode in sequence, so that the rock crushing teeth 411 can vertically contact hard rock geology during the rotation and forward movement of the rock crushing roller 412, and the optimal rock crushing effect is achieved.
As shown in fig. 4, the rock breaking head 410 further comprises tooth holders 414 corresponding to the rock breaking teeth 411 one by one, the tooth holders 414 are fixed on the rock breaking roller 412, and the rock breaking teeth 411 are detachably connected with the corresponding tooth holders 414. The rock crushing teeth 411 are fixed on the rock crushing roller 412 through the tooth holder 414, and the rock crushing teeth 411 are detachably connected with the tooth holder 414, so that the rock crushing teeth 411 can be conveniently maintained and replaced daily, and the rock crushing roller is suitable for different seabed hard soil working conditions.
In this embodiment, the rock breaking teeth 411 are installed on the tooth holder 414 in a clamping manner, and are easy to detach and replace after being worn, and the rock breaking teeth 411 and the tooth holder 414 can also adopt other detachable connection modes according to actual needs.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a detritus harrow head for broken rock operation under water, its characterized in that, including the harrow head body, and set up in harrow tooth, harrow head suction inlet and the detritus device that the harrow head body and follow its operation direction of advance arranged in proper order, the detritus device is including the detritus head that has the detritus tooth and drive the actuating mechanism that the detritus head reciprocated.
2. A rock breaking rake head as claimed in claim 1 wherein the drive mechanism comprises a support link rotatably connected at one end to the rake head body and a first drive unit for driving the support link to swing up and down, the rock breaking head being connected to the other end of the support link.
3. A rock breaking rake head as claimed in claim 2, wherein the rock breaking device further comprises a connecting pipe connected to and arranged coaxially with the rake head body, and a trunnion arranged on the connecting pipe, wherein an end of the support link remote from the rock breaking head is hinged to the trunnion.
4. A rock breaking rake head as claimed in claim 2, further comprising a stop block disposed on the rake head body towards a side of the support link; when the supporting connecting frame abuts against the limiting block, a distance exists between the rock crushing head and the harrow head body.
5. A rock breaking rake head as claimed in any one of claims 2 to 4 wherein the first drive unit comprises a cylinder fixed to the rake head body and a hydraulic ram having one end connected to the middle of the support link.
6. A rock breaking rake head as claimed in any one of claims 1 to 4, wherein the rock breaking head comprises a horizontally arranged rock breaking roller and a second driving unit for driving the rock breaking roller to rotate, and the rock breaking teeth are arranged on the outer wall of the rock breaking roller.
7. A rock breaking rake head as claimed in claim 6, wherein the outer wall of the rock breaking cylinder is provided with a plurality of turns of rock breaking tooth groups arranged side by side in the axial direction thereof, each rock breaking tooth group being provided with a plurality of rock breaking teeth arranged circumferentially of the rock breaking cylinder.
8. A rock breaking rake head as claimed in claim 7 wherein the rock breaking teeth in each set of rock breaking teeth are arranged successively forwardly in the direction of rotation of the rock breaking drum.
9. A rock breaking rake head as claimed in claim 6, wherein the rock breaking head further comprises toothholders corresponding to the rock breaking teeth one to one, the toothholders are fixed on the rock breaking roller, and the rock breaking teeth are detachably connected with the corresponding toothholders.
10. A rock breaking rake head as claimed in any one of claims 6 to 9 wherein the second drive unit comprises a drive gear connected to the rock breaking drum and a hydraulic or electric motor for driving the drive gear in rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010740283.9A CN111894058A (en) | 2020-07-28 | 2020-07-28 | Rock crushing harrow head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010740283.9A CN111894058A (en) | 2020-07-28 | 2020-07-28 | Rock crushing harrow head |
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| Publication Number | Publication Date |
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| CN111894058A true CN111894058A (en) | 2020-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010740283.9A Pending CN111894058A (en) | 2020-07-28 | 2020-07-28 | Rock crushing harrow head |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1671923A (en) * | 2002-01-24 | 2005-09-21 | 朱根·申克 | Milling device for floors, rock, excavated material or other material |
| US20150322644A1 (en) * | 2013-01-29 | 2015-11-12 | Vsl International Ag | Hydromill wheel with single disc cutting rollers |
| CN208685686U (en) * | 2018-07-27 | 2019-04-02 | 中交疏浚技术装备国家工程研究中心有限公司 | Reduce drag head dredging system, the trailing suction hopper dredger of excavating resistance using rolling friction |
| CN110761352A (en) * | 2019-10-29 | 2020-02-07 | 河海大学常州校区 | Trailing suction hopper dredger harrow head based on supplementary broken rock of ultrasonic wave |
| CN111335391A (en) * | 2020-03-27 | 2020-06-26 | 长沙矿山研究院有限责任公司 | Self-propelled seabed rock crushing and leveling operation vehicle |
| CN212641558U (en) * | 2020-07-28 | 2021-03-02 | 中交广州航道局有限公司 | Rock crushing harrow head |
-
2020
- 2020-07-28 CN CN202010740283.9A patent/CN111894058A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1671923A (en) * | 2002-01-24 | 2005-09-21 | 朱根·申克 | Milling device for floors, rock, excavated material or other material |
| US20150322644A1 (en) * | 2013-01-29 | 2015-11-12 | Vsl International Ag | Hydromill wheel with single disc cutting rollers |
| CN208685686U (en) * | 2018-07-27 | 2019-04-02 | 中交疏浚技术装备国家工程研究中心有限公司 | Reduce drag head dredging system, the trailing suction hopper dredger of excavating resistance using rolling friction |
| CN110761352A (en) * | 2019-10-29 | 2020-02-07 | 河海大学常州校区 | Trailing suction hopper dredger harrow head based on supplementary broken rock of ultrasonic wave |
| CN111335391A (en) * | 2020-03-27 | 2020-06-26 | 长沙矿山研究院有限责任公司 | Self-propelled seabed rock crushing and leveling operation vehicle |
| CN212641558U (en) * | 2020-07-28 | 2021-03-02 | 中交广州航道局有限公司 | Rock crushing harrow head |
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