CN213173891U - Hobbing cutter head driven by outer rotor motor for dredging engineering trailing suction hopper dredger - Google Patents
Hobbing cutter head driven by outer rotor motor for dredging engineering trailing suction hopper dredger Download PDFInfo
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- CN213173891U CN213173891U CN202021369821.XU CN202021369821U CN213173891U CN 213173891 U CN213173891 U CN 213173891U CN 202021369821 U CN202021369821 U CN 202021369821U CN 213173891 U CN213173891 U CN 213173891U
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Abstract
The utility model provides a hobbing cutter drag head driven by an external rotor motor for a drag suction dredger in dredging engineering, wherein a drag head fixing body is rotationally connected with a movable cover, and a high-pressure flushing elbow is arranged above the drag head fixing body; a roller provided with rake teeth is assembled below the movable cover and comprises a roller, a tooth holder and the rake teeth, an outer rotor motor is hermetically arranged in the roller, and the roller is driven to rotate around a horizontal shaft through a stator and a rotor; the whole roller with the harrow teeth is rotationally connected with the movable cover of the harrow head and can rotate in a certain angle range along with the movable cover relative to the fixed body of the harrow head. The utility model provides a hobbing cutter rake head's structural design can show the cutting ability that improves the rake teeth, and the external rotor electric machine design is compared traditional gear drive structure and can be alleviateed rake head weight by a wide margin, reduces axial restraint annex, improves effective cutting width to realize the high rotational speed of cylinder and high speed governing scope, promote the rake head by a wide margin and excavate soil body intensity scope.
Description
Technical Field
The utility model belongs to the technical field of dredging equipment.
Background
Drag suction dredgers and cutter suction dredgers are the two most widely used dredging construction vessels at present. The drag suction dredger is flexible in maneuvering, strong in wind and wave resistance and large in operation water depth range, a drag head connected with the drag arm is placed under water during operation, the ship sails to drag the drag head to cut a soil layer through the drag arm, and dredged substances are sucked into a drag head fixing body and conveyed to a mud cabin through a drag pipe in the drag arm. Dredging efficiency is of critical importance in the dredging process and is influenced by many parameters, one of which is the soil condition. Hard earth often causes dredging inefficiency. The trailing suction hopper dredger has high dredging efficiency on soft soil, but when encountering hard soil, the existing trailing head structure and trailing teeth have limited soil breaking capacity, low operation efficiency and even difficult soil breaking.
Fig. 1 shows a schematic view of the main components of a trailing suction hopper dredger, the drag head 1 being connected to the hull 3 by a drag arm 2. Fig. 2 is a schematic structural view of a conventional drag head, and a row of drag teeth are arranged below a movable cover. As shown in fig. 3, the harrow teeth are embedded into soil under the self weight of the harrow head and the pressure of the spring supporting rod during operation, and the harrow arm drags the harrow teeth to cut soil. The upper limit of the soil strength of the existing drag head capable of cutting is about 50-60 kPa, the soil breaking capacity is seriously reduced when hard soil is met, the drag teeth are difficult to be embedded into the soil or the embedding depth is smaller, and the operation efficiency is greatly reduced.
The most common structure and implementation mode of the hob head in the prior art is to drive the hob by using a hydraulic motor in cooperation with a gear reducer, as shown in fig. 4, the transmission structure is complex, the size of the hydraulic motor and the size of the gear reducer are large, and the hydraulic motor and the gear reducer need to be carried above a roller with rake teeth for ensuring operation. The hobbing cutter harrow head adopting the structure has the following defects in practical engineering application:
(1) the structure is driven by an external hydraulic motor and a gear reducer transmission system, the weight of the drag head can be obviously increased by the driving system, the soil body strength is higher, the power requirement on the driving system is higher, and the size and the weight of the corresponding driving system can be further increased. In order to realize the transmission power of about 400KW at the rotating speed of 50-150 r/min, the gear boxes are arranged in a bidirectional symmetrical structure, and the increased weight can reach 10-18 t. In addition, the diameter of the driving system shaft of the driving capability is larger than that of the roller provided with the harrow teeth, so that the harrow teeth are difficult to cut or cannot cut medium hard soil, the dredging efficiency is limited, and the expected operation efficiency cannot be achieved.
(2) The larger driving system also causes the supporting structure connected with the shaft of the roller to occupy a larger proportion of the horizontal axial direction of the roller, the width of the hob actually participating in cutting only occupies 50-60% of the design size of the horizontal shaft of the roller, and the operating efficiency of the hob head is reduced. The axial size of the hob is a key constraint condition for designing the hob head, and a certain size must be sacrificed for installing a gear box in the horizontal axial direction of the roller due to the existence of a transmission system. The drag head is designed to be 3.5m wide, and under a certain navigation speed and digging depth condition, the ratio of the installation size of the gear box to the size of the horizontal shaft of the roller and the digging efficiency are shown in a table 1:
TABLE 1 different mounting dimension ratios and efficiency comparisons of gearboxes
It follows that designing a perfectly designed reducer necessarily causes the gear box to occupy the horizontal axial dimension of the drum, resulting in a reduction in excavation efficiency.
(3) The underwater speed reducer equipment technology in the water depth range of 20-60 m is not mature, no serialized products can be selected, the reliability of the customized products and the control of the supply link are very difficult, and the fault maintenance frequency in the use link can be multiplied. From the perspective of product development and application, the choice of an external hydraulic motor and gear reducer drive system to drive is not the optimal choice.
Therefore, the development of a novel drag head for improving the soil breaking capacity and the construction efficiency of the drag suction dredger is the key for technical personnel in the current dredging industry to solve the problem of dredging hard soil.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a problem that the ability of breaking ground is not enough when meetting the stereoplasm soil to current rake head structure and rake teeth, provide an external rotor motor driven hobbing cutter rake head for dredging engineering drag suction dredger, can effective control rake head weight, reduce axial restraint annex, improve effective cutting width, promote the operating efficiency that the ability of breaking ground of rake head and dredge the stereoplasm soil by a wide margin.
The utility model aims at realizing through the following technical scheme:
a hob drag head for an outer rotor motor drive of a drag suction dredger for dredging engineering, comprising: a drag head fixing body, a drag head movable cover, a roller provided with drag teeth, an outer rotor motor, a hydraulic device and a high-pressure flushing elbow. The drag head fixing body is movably connected with the drag head movable cover through a pin hole, the roller provided with the drag teeth is rotatably connected to the lower part of the drag head movable cover, and the front end of the hydraulic device is connected to the upper part of the drag head movable cover through a rotating shaft, so that the drag head movable cover is driven by the hydraulic device to rotate around the pin hole connecting the drag head movable cover and the drag head fixing body. The rabble blade-equipped drum comprises: the outer rotor motor comprises a roller, a tooth holder and harrow teeth, wherein the outer rotor motor is hermetically arranged in the roller, so that the roller provided with the harrow teeth can rotate around a horizontal shaft of the roller under the driving of a rotor of the outer rotor motor. The hydraulic device is characterized in that a wear-resistant bottom plate and a wear-resistant block with high-pressure flushing water are mounted at the bottom of the drag head fixing body, a high-pressure flushing elbow is arranged above the drag head fixing body, the upper portion of the high-pressure flushing elbow is movably connected to the rear end of a cylinder body of the hydraulic device through a rotating shaft, a pipe orifice of the high-pressure flushing elbow is located at the front end of the drag head fixing body, and a branch pipe is arranged in front of the pipe orifice of the high-pressure flushing elbow and used for providing hydraulic power for the hydraulic device and providing high-pressure water flow for the wear-.
When the outer rotor motor-driven hobbing cutter harrow head provided by the utility model is used for working, the hobbing cutter harrow head is placed on the excavated mud surface, a water pump and the outer rotor motor are started, the water pump sucks water, the water flows to a branch pipe through the high-pressure flushing elbow pipe to drive the hydraulic device to work, and meanwhile, high-speed water flow is sprayed from the high-pressure flushing part of the wear-resistant block to flush the mud surface; the outer rotor motor drives the roller provided with the rake teeth to rotate, the rake teeth rotating along with the roller cut soil, slurry mixed with muddy water is sucked into the rake head fixing body, and then the slurry is conveyed to a mud cabin on the body of the trailing suction dredger through the rake arm.
In the navigation operation process of the trailing suction hopper dredger, the design navigational speed of the harrow head, the roller rotating speed and the torque are matched with each other very importantly for the hob harrow head, wherein the excavating torque is the most important, and if the torque cannot be reduced, the cutting excavation of hard soil cannot be completed. Compared with the hydraulic motor drive, the hob drag head driven by the outer rotor motor can realize higher rotating speed and speed regulation range, the rotating speed of the hob is increased, the excavation torque of the hob can be reduced, excavation of different hard soils is realized, and the excavation range is increased. Table 2 below is the effect of increasing rotational speed on hob digging torque under different cruise conditions.
TABLE 2 variation of torque of hob at different rotational speeds
In the navigation operation process of the trailing suction dredger, when soil which is difficult to excavate is encountered, the rotating speed of the hob can be increased, so that the excavating torque of the hob is reduced, excavation of different hard soil is realized, and the excavating range is increased.
The utility model provides an external rotor motor driven hobbing cutter harrow head for dredging engineering drag suction dredge will provide the motor of power for the cylinder and arrange the cylinder in sealed, give up outside hydraulic motor and gear reducer transmission system design, and existing effect has controlled hobbing cutter harrow head weight, make full use of hobbing cutter harrow head axial structure space again, the guarantee has improved the effective cutting width of harrow head. Compared with the hydraulic motor drive, the hobbing cutter harrow head driven by the outer rotor motor can greatly reduce the weight of the harrow head, reduce the axial constraint accessories, improve the effective cutting width, realize higher rotating speed and speed regulation range, greatly improve the soil body excavation intensity range of the harrow head, and further improve the dredging efficiency of the trailing suction dredger adopting the hobbing cutter harrow head.
Meanwhile, the application of the outer rotor motor to the drag head also needs to solve the problems of control line arrangement, underwater motor technology and the like. Further, the outer rotor motor includes: the rotor and the stator are positioned in the roller, the stator is fixed at the axis and is fixed, the power control line is led out from the interior of the stator through the end part of the roller and penetrates out to the outer side of a drag head through a sealing ring, the penetrated power control line is arranged outside a drag head movable cover and is upwards connected with a control chamber on a drag suction dredger along a drag arm, and the rotor drives the roller to rotate around the stator under the drive of a motor, so that drag teeth assembled on the surface of the roller are driven to rotate to cut soil. Furthermore, the outer rotor motor adopts a composite sealing structure combining dynamic sealing and static sealing, so that the outer rotor motor has good underwater sealing performance. The rotor is sequentially provided with three sealing rings from outside to inside, wherein the sealing ring positioned in the middle is arranged between the rotor and the contact surface of the roller.
Compare current harrow head cutting soil body intensity upper limit 50 ~ 60kPa, the utility model discloses the soil body intensity of cutting can reach 200kPa, and cutting soil layer thickness can reach 3 times of current harrow head cutting thickness. The structure of the hydraulic motor ensures that the effective cutting width of the drag head can reach more than 95% of the design width of the drag head, the external power control line can control the rotating speed of the roller with the drag teeth according to the condition and action requirement of soil excavation, the rotating speed range is 50-300 r/min, and compared with the existing hydraulic motor external driving technology, the hydraulic motor can realize higher rotating speed and larger speed regulation range.
Wherein the rabble blade-equipped drum comprises: the roller comprises a roller, tooth holders and rake teeth, wherein the tooth holders are welded on the surface of the roller along the horizontal axis direction, the rake teeth are installed on the tooth holders, different types of rake teeth can be replaced according to the excavating property and dredging requirements, two ends of the roller are rotatably connected with the rake head movable cover, and an external rotor motor is arranged in the roller to drive the roller.
Furthermore, the wear-resistant blocks are arranged in two rows in front of the wear-resistant bottom plate, a gap is reserved between the two rows of wear-resistant blocks, a row of high-pressure flushing ports are respectively arranged in the upper cavities of the two rows of wear-resistant blocks, and the directions of the high-pressure flushing ports are all arranged towards the middle gap and slightly inclined towards the mud surface, so that the sprayed high-pressure water flow can flush the excavated mud surface and can also clean the mud adhered to the wear-resistant blocks.
Preferably, the wear-resistant block is detachably mounted in front of the wear-resistant bottom plate, so that maintenance and replacement are facilitated.
Drawings
Fig. 1 is a schematic connection diagram of a trailing suction hopper dredger, a rake arm and a rake head in the prior art.
Fig. 2 is a schematic structural diagram of a drag head in the prior art.
Fig. 3 is a schematic operation diagram of a drag head in the prior art.
Fig. 4 is a schematic structural diagram of an example of a hob head in the prior art.
Fig. 5 is a side view of a preferred embodiment of the external rotor motor driven hob head for a drag suction dredger for dredging engineering according to the present invention.
Fig. 6 is a side view of the rake-equipped drum of the embodiment shown in fig. 5.
Fig. 7 is a cross-sectional view of the rake-equipped drum of the embodiment shown in fig. 5.
Fig. 8 is a schematic view of the right part of the drum of the rabble blade-equipped drum shown in fig. 7.
Fig. 9 is a sectional view a-a of the site shown in fig. 8.
Wherein, 1, a drag head; 11. a drag head fixing body; 12. a drag head movable cover; 13. a roller with rake teeth; 14. an outer rotor motor; 141. a rotor; 142. a stator; 143. a power control line; 15. a hydraulic device; 16. a high pressure flush elbow; 17. a wear-resistant base plate; 18. a wear-resistant block; 2. harrowing a pipe; 3. a trailing suction hopper dredger hull; 4. a first seal ring; 5. a second seal ring; 6. and a third sealing ring.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and embodiments, but the present embodiment is not limited to the present invention, and all similar structures and similar variations thereof adopted by the present invention should be included in the protection scope of the present invention.
The outer rotor motor driven hob head for a drag suction dredger for dredging engineering shown in fig. 5-7 comprises: the drag head comprises a drag head fixing body 11, a drag head movable cover 12, a roller 13 provided with drag teeth, an outer rotor motor 14, a hydraulic device 15 and a high-pressure flushing elbow pipe 16, wherein the drag head movable cover 12 is movably connected with the drag head fixing body 11, the roller 13 provided with the drag teeth and the hydraulic device 15. The drag head fixing body 11 is movably connected with the drag head movable cover 12 through a pin hole; the roller 13 provided with the harrow teeth is rotatably connected to the lower part of the harrow head movable cover 12, and the front end of the hydraulic device 15 is connected to the upper part of the harrow head movable cover 12 through a rotating shaft; the cylinder 13 with the rake teeth driven by the hydraulic device 15 can rotate with the rake head movable cover 12 around the pin hole connecting the rake head movable cover 12 and the rake head fixing body 11, and the cylinder 13 with the rake teeth can also rotate freely around the horizontal shaft. The bottom of the drag head fixing body 11 is provided with a wear-resistant bottom plate 17 and a wear-resistant block 18 with high-pressure flushing water, a high-pressure flushing elbow 16 is arranged above the drag head fixing body 11, the upper part of the high-pressure flushing elbow 16 is movably connected with the rear end of a cylinder body of a hydraulic device 15 through a rotating shaft, a pipe orifice of the high-pressure flushing elbow 16 is positioned at the front end of the drag head fixing body 11, a branch pipe is arranged in front of the pipe orifice of the high-pressure flushing elbow 16, and the branch pipe is used for providing hydraulic power for the hydraulic device 15 and providing high-pressure water flow for the wear-.
As shown in connection with fig. 6-9, the rabble blade-equipped drum 13 comprises: cylinder, toothholder and rake teeth. The surface of the roller is welded with a plurality of rows of tooth holders along the horizontal axis direction, and the rake teeth are arranged on the tooth holders, so that different types of rake teeth can be replaced according to the excavation property and the dredging requirement. Two ends of a roller 13 provided with harrow teeth are rotationally connected with a harrow head movable cover 12, and an outer rotor motor 14 is arranged in the roller in a sealing way. The outer rotor motor 14 includes: the rotor 141 and the stator 142 are positioned in the roller, the stator 142 is fixed at the axis and is fixed, the power control line 143 is led out from the end of the roller inside the stator 142 and penetrates out to the outer side of the drag head through a sealing ring, the penetrated power control line 143 is arranged outside the drag head movable cover 12 and is connected with a control chamber on the drag suction dredger along the drag arm, and the rotor 141 is sequentially provided with a first sealing ring 4, a second sealing ring 5 and a third sealing ring 6 from outside to inside. The second sealing ring 5 in the middle is arranged between the contact surface of the rotor 141 and the roller and is static sealing, and the first sealing ring 4 and the third sealing ring 6 are arranged on two sides of the second sealing ring 5 and are dynamic sealing. The composite sealing structure combining the dynamic seal and the static seal enables the outer rotor motor 14 to have good underwater sealing performance. Under the drive of the motor, the rotor 141 drives the roller to rotate around the stator 142, so as to drive the rake teeth assembled on the surface of the roller to rotate and cut soil. The external rotor motor is adopted to drive the hob drag head, so that the structural weight of the drag head is effectively controlled, the horizontal axial structural space of the roller is fully utilized, the effective cutting width is improved, the high rotating speed and high speed regulating range of the roller are realized, and the soil body excavating strength range and the dredging efficiency of the drag head are greatly improved.
The wear-resistant blocks 18 are arranged in two rows in front of the wear-resistant bottom plate 17 and are detachable, a gap is reserved between the two rows of wear-resistant blocks 18, a row of high-pressure flushing ports are respectively arranged in the upper cavities of the two rows of wear-resistant blocks 18, the directions of the high-pressure flushing ports are all arranged towards the middle gap and slightly incline towards the mud surface, so that the sprayed high-pressure water flow can flush the excavated mud surface and can also clean the mud adhered to the wear-resistant blocks 18.
When the outer rotor motor-driven hobbing cutter harrow head provided by the utility model is used for working, the hobbing cutter harrow head 1 is placed on a mud surface to be excavated, a water pump and an outer rotor motor 14 are started, the water pump sucks water, the water flows to a branch pipe through a high-pressure flushing elbow pipe 16 to drive a hydraulic device 15 to work, and meanwhile, high-speed water flow is sprayed out from a gap in the middle of a wear-resistant block 17 and is flushed to the mud surface; the outer rotor motor 14 drives the roller 13 provided with the rake teeth to rotate, the rake teeth rotating along with the roller cut soil, and slurry mixed with mud and water is sucked into the rake head fixing body 11 and then is conveyed to a mud cabin on the body 3 of the trailing suction dredger through the rake pipe 2 in the rake arm. In the navigation operation process of the trailing suction dredger, when soil which is difficult to excavate is encountered, the rotating speed of the hob can be increased, so that the excavating torque of the hob is reduced, excavation of different hard soil is realized, and the excavating range is increased.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention in any way. Any changes or modifications of the above-described embodiments, which may be made by those skilled in the art based on the above-described disclosure, should be considered as equivalent effective embodiments, and all fall within the scope of the protection of the present invention.
Claims (6)
1. A hobbing cutter harrow head for external rotor motor drive of dredging engineering trailing suction hopper dredger, characterized by that includes: a drag head fixing body (11), a drag head movable cover (12), a roller (13) provided with drag teeth, an outer rotor motor (14), a hydraulic device (15) and a high-pressure flushing elbow (16);
the drag head fixed body (11) is movably connected with the drag head movable cover (12) through a pin hole, the roller (13) provided with the drag teeth is rotatably connected to the lower part of the drag head movable cover (12), the front end of the hydraulic device (15) is connected to the upper part of the drag head movable cover (12) through a rotating shaft, so that the drag head movable cover (12) is driven by the hydraulic device (15) to rotate around the pin hole connecting the drag head movable cover (12) and the drag head fixed body (11);
the rabble blade-equipped drum (13) comprises: the outer rotor motor (14) is hermetically arranged in the roller, so that the roller (13) provided with the rake teeth can rotate around a horizontal shaft of the roller under the driving of a rotor of the outer rotor motor (14);
the bottom of the drag head fixing body (11) is provided with a wear-resistant bottom plate (17) and a wear-resistant block (18) with high-pressure flushing water, a high-pressure flushing elbow (16) is arranged above the drag head fixing body (11), the upper part of the high-pressure flushing elbow (16) is movably connected to the rear end of a cylinder body of the hydraulic device (15) through a rotating shaft, a pipe orifice of the high-pressure flushing elbow (16) is located at the front end of the drag head fixing body (11), and a branch pipe is arranged in front of the pipe orifice of the high-pressure flushing elbow (16) and used for providing hydraulic power for the hydraulic device (15) and providing high-pressure water flow for the wear-resistant block (18).
2. The external rotor motor-driven hob drag head for a drag suction dredger for dredging engineering according to claim 1, characterized in that: the outer rotor motor (14) includes: the scraper suction dredger comprises a rotor (141), a stator (142) and a power control line (143), wherein the rotor (141) and the stator (142) are positioned in the roller, the stator (142) is fixed at the shaft center and does not move, the power control line (143) is led out from the interior of the stator (142) through the end part of the roller and penetrates out to the outer side of a drag head through a sealing ring, the power control line (143) penetrating out is arranged outside a drag head movable cover (12) and is upwards connected with a control chamber on the scraper suction dredger along a drag arm, and the rotor (141) drives the roller to rotate around the stator (142) under the drive of a motor, so that drag teeth assembled on the surface of the roller are driven to rotate to cut soil.
3. The external rotor motor-driven hob drag head for a drag suction dredger for dredging engineering according to claim 2, characterized in that: the outer rotor motor (14) is arranged in the roller by adopting a composite sealing structure combining dynamic sealing and static sealing.
4. The external rotor motor-driven hob drag head for a drag suction dredger for dredging engineering according to claim 2, characterized in that: the rotor (141) is provided with three sealing rings from outside to inside in sequence, wherein the sealing ring positioned in the middle is arranged between the rotor (141) and the contact surface of the roller.
5. The external rotor motor-driven hob drag head for a drag suction dredger for dredging engineering according to claim 1, characterized in that: the wear-resistant blocks (18) are arranged in two rows in front of the wear-resistant bottom plate (17), a gap is reserved between the two rows of wear-resistant blocks (18), a row of high-pressure flushing ports are respectively arranged in a cavity above the two rows of wear-resistant blocks (18), the directions of the high-pressure flushing ports are all arranged towards the middle gap and slightly incline towards a mud surface, so that sprayed high-pressure water flow can flush the excavated mud surface, and the mud adhered to the wear-resistant blocks (18) can be cleaned.
6. The external rotor motor-driven hob drag head for a drag suction dredger for dredging engineering according to claim 5, characterized in that: the wear-resistant block (18) is detachably arranged in front of the wear-resistant bottom plate (17).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021369821.XU CN213173891U (en) | 2020-07-13 | 2020-07-13 | Hobbing cutter head driven by outer rotor motor for dredging engineering trailing suction hopper dredger |
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| CN202021369821.XU CN213173891U (en) | 2020-07-13 | 2020-07-13 | Hobbing cutter head driven by outer rotor motor for dredging engineering trailing suction hopper dredger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113565158A (en) * | 2021-09-28 | 2021-10-29 | 江苏玖泰电力实业有限公司 | Deep digging drag head of trailing suction hopper dredger |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113565158A (en) * | 2021-09-28 | 2021-10-29 | 江苏玖泰电力实业有限公司 | Deep digging drag head of trailing suction hopper dredger |
| CN113565158B (en) * | 2021-09-28 | 2021-12-24 | 江苏玖泰电力实业有限公司 | Deep digging drag head of trailing suction hopper dredger |
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