A sand rake head having a coral rock breaking device

Abstract

The application discloses a sand-taking harrow head with a coral reef rock crushing device and belongs to the technical field of harrow heads. The sand-taking harrow head with the coral reef rock crushing device comprises a harrow head main body provided with a high-pressure water flushing component, a movable cover movably connected to the harrow head main body, a pin shaft arranged between the movable cover and the harrow head main body, a steel wire rope connected to the top of the movable cover, a wave compensator arranged on a ship body and connected to the end of the steel wire rope away from the movable cover, short harrow teeth arranged at the bottom of the movable cover, a flexible chain grating arranged between the harrow head main body and the movable cover, and a linkage crushing mechanism arranged at the end of the harrow head main body away from the movable cover.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of harrow head, and in particular to a sand taking harrow head with coral reef rock crushing device. BACKGROUND

[0002] At present, dredging refers to the process of using artificial, hydraulic and mechanical means to excavate underwater earthwork such as silt and stone and transport it to other places. The cutter suction dredger is a large self-propelled and cabin-type dredger equipped with a harrow head dredging tool and a hydraulic suction dredging device. The harrow head is connected to the ship body through a harrow arm, which can make up and down movement, and the rear end is put into the water at a certain depth, so that the harrow head is in contact with the dredging working surface of the underwater soil layer.

[0003] With the increasing demand for construction of offshore and island reefs, the amount of sand used for infrastructure is gradually increasing, and many sand sources are distributed in deep sea and located in the sea area surrounded by coral reef disc. There are a large number of finger-shaped and disc-shaped corals on the seabed of the sand source, and the coral reef disc is hard and irregularly distributed. When the harrow is dredged, the harrow teeth and tooth seats are very easy to be in a state of being subjected to all drag forces in a few or individual places, which easily damages the harrow teeth and tooth seats. Moreover, the coral particles are large in size, which is extremely unfavorable for the sand taking and cabin loading of the cutter suction dredger. The coral reef stones are easily stuck in the harrow head grid, which causes the harrow head flow passage to be sharply reduced after the harrow head is blocked, and the underwater mud pump appears abnormal vibration, which is low in efficiency and threatens the safety of the equipment. Moreover, cleaning the coral reef stones stuck on the harrow head needs to stop the pump and raise the harrow, which is time-consuming and laborious, and increases the labor intensity of personnel. SUMMARY

[0004] The purpose of the present application is to solve the problems existing in the prior art, and a sand taking harrow head with coral reef rock crushing device is provided.

[0005] In order to achieve the above purpose, the technical scheme is as follows:

[0006] A sand taking harrow head with coral reef rock crushing device, comprising a harrow head main body provided with a high-pressure water flushing component, a movable cover movably connected to the harrow head main body, a pin shaft provided between the movable cover and the harrow head main body, a steel wire rope connected to the top of the movable cover, a wave compensator provided on the ship body and connected to the end of the steel wire rope away from the movable cover, short harrow teeth provided at the bottom of the movable cover, a flexible chain grid provided between the harrow head main body and the movable cover, and a linkage crushing mechanism provided at the end of the harrow head main body away from the movable cover.

[0007] Preferably, the slitting assembly comprises a first rotating shaft rotatably connected in the working box, a plurality of first crank shafts are arranged on the first rotating shaft, a first sleeve ring is sleeved on the first crank shaft, a first connecting rod is fixedly arranged on the first sleeve ring, a first sliding rod is movably connected to the first connecting rod and slides relative to the working box, and a slitting plate is connected to one end of the first sliding rod away from the first connecting rod.

[0008] Preferably, the slitting plate is connected with a water guide block at an end away from the movable cover, and an upper inclined surface and a lower inclined surface are formed on one side of the water guide block.

[0009] Preferably, the crushing assembly comprises a second rotating shaft rotatably connected in the working box, a plurality of second crank shafts are arranged on the second rotating shaft, a second sleeve ring is sleeved on the second crank shaft, a second connecting rod is fixedly arranged on the second sleeve ring, a second sliding rod is movably connected to the second connecting rod and slides relative to the working box, and a crushing piece is connected to one end of the second sliding rod away from the second connecting rod, the second sliding rod is composed of an upper rod body movably connected with the second connecting rod and a lower rod body fixedly connected with the crushing piece, a rotating shaft is connected between the upper rod body and the lower rod body, and a torsion spring for driving the second sliding rod to rotate back is sleeved on the rotating shaft.

[0010] Preferably, the crushing piece comprises a crushing ball fixedly connected with the lower rod body of the second sliding rod and a crushing insertion rod fixedly connected with the crushing ball.

[0011] Preferably, the transmission assembly comprises a driving motor fixedly arranged in the working box, an output shaft of the driving motor is connected with the first rotating shaft, a main gear is arranged on the first rotating shaft, a secondary gear meshing with the main gear is rotatably connected in the working box, a transmission gear is arranged on the secondary gear, and an upper gear meshing with the transmission gear is arranged on the second rotating shaft.

[0012] Preferably, the transmission gear is arranged as a half gear, a lower gear intermittently meshing with the transmission gear is rotatably connected in the working box, a rotating rod is fixedly arranged on the lower gear, a main bevel gear is arranged on the rotating rod, a secondary bevel gear meshing with the main bevel gear is rotatably connected in the working box, a rotating rod is arranged on the secondary bevel gear, a first connecting plate is arranged on the rotating rod, a second connecting plate is movably connected to the first connecting plate, a moving plate is connected to one end of the second connecting plate away from the first connecting plate, a limiting frame is fixedly arranged on the moving plate, and the limiting frame movably abuts against the second sliding rod.

[0013] Preferably, a guide plate is fixedly arranged at the bottom of the working box, and the moving plate is slidably connected in the guide plate.

[0014] Preferably, a hydraulic cylinder is fixedly arranged on the rake head body through a support plate, and a piston rod of the hydraulic cylinder is fixedly connected to the top of the working box.

[0015] Preferably, the top of the movable cover is provided with a sealing plate for sealing the water inlet window, and the two sides of the movable cover are provided with 80*100mm flow channels.

[0016] Compared with the prior art, the sand taking rake head with the coral reef rock crushing device has the following beneficial effects:

[0017] 1. The sand taking rake head with the coral reef rock crushing device crushes the reef rocks on the sand taking path through the linkage crushing mechanism, and the crushed rocks are further sucked through the rear rake suction port and the rake teeth, thereby reducing the stress on the rake teeth and the occurrence of the blockage of the rake head by large rocks, improving the construction efficiency, and reducing the maintenance cost of the rake head.

[0018] 2. The sand taking rake head with the coral reef rock crushing device increases the range of action of the two sides of the rake head and reduces the water suction amount by opening 80*100mm flow channels on the original rake head side plate and closing the water inlet window on the upper part of the movable cover, thereby sucking the fine sand within the range of 1m on each side of the rake head into the movable cover of the rake head, enhancing the working condition adaptation range of the rake head, and improving the sand taking efficiency.

[0019] 3. The sand taking rake head with the coral reef rock crushing device uses the flexible chain grating, and in the process of rake suction construction, the flexible chain grating is in a continuously vibrating environment due to the impact of the coral reef rocks and the scouring effect caused by the high-speed passing of the mud, so that the rocks are not easily blocked on the flexible chain grating or can be automatically removed under the vibration and scouring effect after being blocked, thereby improving the problems of the traditional steel plate grating in construction, preventing the rocks and other sundries from entering the rake pipe and blocking the mud pump, and enabling the movable cover of the rake head to be moved after the rake head is blocked, so that the sundries are dropped due to the flexibility of the chain, the probability of the stoppage of the rake head caused by the blockage of the sundries is reduced, and the number of manual rake cleaning is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure of the present application is shown in the figure Figure One ;

[0021] Figure 2 The structure of the present application is shown in the figure Figure Two ;

[0022] Figure 3 The structure of the linkage crushing mechanism of the present application is shown in the figure

[0023] Figure 4 The structure of the linkage crushing mechanism of the present application is shown in the figure Figure 3 The structure of the linkage crushing mechanism of the present application is shown in the figure

[0024] Figure 5 The structure of the linkage crushing mechanism of the present application is shown in the figure

[0025] Figure 6The structure of the transmission assembly of the present application is shown in the schematic view. Figure 5 The local enlarged structure of the B part in the present application is shown in the schematic view.

[0026] Figure 7 The structure of the transmission assembly of the present application is shown in the schematic view.

[0027] In the figure: 1, harrow head body; 101, pin shaft; 2, movable cover; 201, steel wire rope; 202, short harrow tooth; 3, flexible chain grid; 4, working box; 501, first rotating shaft; 502, first crank shaft; 503, first collar; 504, first connecting rod; 505, first sliding rod; 506, splitting plate; 5061, water guide block; 601, second rotating shaft; 602, second crank shaft; 603, second collar; 604, second connecting rod; 605, second sliding rod; 606, crushing piece; 6061, crushing ball; 6062, crushing insertion rod; 7, driving motor; 701, main gear; 702, auxiliary gear; 703, transmission gear; 704, upper gear; 705, lower gear; 8, rotating rod; 801, main bevel gear; 802, auxiliary bevel gear; 803, rotating rod; 804, first connecting plate; 805, second connecting plate; 806, moving plate; 807, limiting frame; 9, guide plate; 10, hydraulic cylinder; 11, sealing plate; 12, flow channel. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0029] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present application, it should be noted that unless otherwise expressly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be interpreted broadly, for example, "connected" can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be internal communication of two elements; for those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Embodiment: Reference Figure 1 and Figure 2 A sand rake head with a coral reef rock breaking device, comprising a rake head body 1 provided with a high-pressure water flushing component, a movable cover 2 movably connected to the rake head body 1, a pin shaft 101 provided between the movable cover 2 and the rake head body 1, a steel wire rope 201 connected to the top of the movable cover 2, an end of the steel wire rope 201 away from the movable cover 2 being connected to a wave compensator provided on a ship body, short rake teeth 202 provided at the bottom of the movable cover 2, a flexible chain grating 3 provided between the rake head body 1 and the movable cover 2, and a linkage breaking mechanism provided at an end of the rake head body 1 away from the movable cover 2, the linkage breaking mechanism comprising a working box 4, a breaking assembly provided in the working box 4 for breaking the reef rock, a slitting assembly provided in the working box 4 for slitting the reef rock seabed, and a transmission assembly for connecting the breaking assembly and the slitting assembly.

[0032] Specifically, the steel wire rope 201 is connected between the movable cover 2 and the wave compensator on the ship body, the movable cover 2 is in a follow-up mode, and the angle can be automatically adjusted relative to the rake head body 1, avoiding frequent manual operation of hydraulic equipment, achieving the adhesion of the movable cover 2 and the seabed surface, and the cutting of the short rake teeth 202 into the silt, the rake teeth at the bottom of the movable cover 2 are shortened to the short rake teeth 202, and the length of the short rake teeth 202 is 250mm to reduce the torque; by using the flexible chain grating 3, the grating spacing is changed from 340*280mm to 200*200mm, in the process of rake suction construction, under the impact of the coral reef rock and the scouring effect of high-speed mud passing through, the flexible chain grating 3 itself is in a continuously vibrating environment, the block stone is not easy to be blocked on the flexible chain grating 3, or the block stone can fall off under the vibration and scouring effect, improving the problems of the traditional steel plate grating in construction, preventing the block stone and other sundries from entering the rake pipe and blocking the mud pump, and enabling the movable cover to move after the rake head is blocked, using the flexibility of the chain to make the sundries fall off, reducing the probability of sundries blocking the rake head and causing shutdown and the number of manual rake cleaning; by setting the linkage breaking mechanism, the reef rock on the sand extraction path is broken, the broken stone is sucked through the rear rake suction port and rake teeth, reducing the stress on the short rake teeth 202 and the occurrence of the rake head being blocked by large stones, improving the construction efficiency, and reducing the maintenance cost of the rake head.

[0033] Referring to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , as a preferred technical scheme of the present application, the slitting assembly comprises a first rotating shaft 501 rotatably connected in the working box 4, a plurality of first crank shafts 502 are arranged on the first rotating shaft 501, a first sleeve ring 503 is sleeved on the first crank shaft 502, a first connecting rod 504 is fixedly arranged on the first sleeve ring 503, a first sliding rod 505 slidingly connected with the working box 4 is movably connected on the first connecting rod 504, and a slitting plate 506 is connected at an end of the first sliding rod 505 away from the first connecting rod 504.

[0034] Further, the crushing assembly comprises a second rotating shaft 601 rotatably connected in the working box 4, a plurality of second crank shafts 602 are arranged on the second rotating shaft 601, a second sleeve ring 603 is sleeved on the second crank shaft 602, a second connecting rod 604 is fixedly arranged on the second sleeve ring 603, a second sliding rod 605 slidingly connected with the working box 4 is movably connected on the second connecting rod 604, and a crushing piece 606 is connected at an end of the second sliding rod 605 away from the second connecting rod 604, the second sliding rod 605 is composed of an upper rod body movably connected with the second connecting rod 604 and a lower rod body fixedly connected with the crushing piece 606, a rotating shaft is connected between the upper rod body and the lower rod body, and a torsion spring for driving the second sliding rod 605 to rotate back is sleeved on the rotating shaft.

[0035] Further, the crushing piece 606 comprises a crushing ball 6061 fixedly connected with the lower rod body of the second sliding rod 605 and a crushing plug rod 6062 fixedly connected with the crushing ball 6061.

[0036] Further, the transmission assembly comprises a driving motor 7 fixedly arranged in the working box 4, an output shaft of the driving motor 7 is connected with the first rotating shaft 501, a main gear 701 is arranged on the first rotating shaft 501, a secondary gear 702 meshing with the main gear 701 is rotatably connected in the working box 4, a transmission gear 703 is arranged on the secondary gear 702, and an upper gear 704 meshing with the transmission gear 703 is arranged on the second rotating shaft 601.

[0037] Further, the transmission gear 703 is arranged as a half gear, and a lower gear 705 intermittently engaged with the transmission gear 703 is rotatably connected in the working box 4, and a rotating rod 8 is fixedly arranged on the lower gear 705, and a main bevel gear 801 is arranged on the rotating rod 8, and a secondary bevel gear 802 engaged with the main bevel gear 801 is rotatably connected in the working box 4, and a rotating rod 803 is arranged on the secondary bevel gear 802, and a first connecting plate 804 is arranged on the rotating rod 803, and a second connecting plate 805 movably connected with the first connecting plate 804 is arranged on the first connecting plate 804, and a moving plate 806 connected with one end of the second connecting plate 805 away from the first connecting plate 804 is arranged on the second connecting plate 805, and a limiting frame 807 is fixedly arranged on the moving plate 806, and the limiting frame 807 movably abuts against the second sliding rod 605.

[0038] Further, the moving plate 806 is slidably connected in the guiding plate 9 fixedly arranged on the bottom of the working box 4.

[0039] Specifically, when the linkage crushing mechanism works, the control driving motor 7 is driven to rotate, the output shaft of the driving motor 7 drives the first rotating shaft 501 to rotate, the first rotating shaft 501 drives the main gear 701 and the secondary gear 702 to engage and transmit when rotating, the secondary gear 702 drives the transmission gear 703 to rotate, and the transmission gear 703 alternately engages and transmits with the upper gear 704 and the lower gear 705.

[0040] When the transmission gear 703 engages with the upper gear 704, the upper gear 704 drives the second crank shaft 602 to rotate through the second rotating shaft 601, the second crank shaft 602 drives the second sleeve ring 603 to rotate when rotating, the second sleeve ring 603 drives the second sliding rod 605 to slide up and down relative to the working box 4 through the second connecting rod 604, the second sliding rod 605 slides down to crush the bottom reef through the crushing element 606, the crushing plug 6062 first breaks the surface with a point, which facilitates the rapid insertion into the reef, breaks the reef, and as the second sliding rod 605 continues to slide down, the crushing ball 6061 further crushes the broken reef.

[0041] When the transmission gear 703 no longer engages with the upper gear 704, the transmission gear 703 engages and transmits with the lower gear 705, the lower gear 705 drives the main bevel gear 801 and the secondary bevel gear 802 to engage and transmit, the secondary bevel gear 802 drives the first connecting plate 804 to rotate, the first connecting plate 804 drives the moving plate 806 to move horizontally through the second connecting plate 805, the moving plate 806 slides in the guiding plate 9, and the moving plate 806 drives the limiting frame 807 to push the lower rod body of the second sliding rod 605 out of the working box 4 when moving horizontally and reciprocally, so that the lower rod body drives the crushing plug 6062 to swing in the reef layer, loosens the reef layer, and as the transmission gear 703 continues to rotate, the transmission gear 703 no longer engages with the lower gear 705 but engages with the upper gear 704, and the crushing work of the reef is repeated.

[0042] When the first rotating shaft 501 rotates, the first rotating shaft 501 drives the first ring 503 to rotate through the first crank shaft 502, the first ring 503 drives the first sliding rod 505 to move up and down relative to the working box 4 through the first connecting rod 504, so that when the first sliding rod 505 moves downward, the reef layer adhered is cut through by the cutting plate 506, the reef layers are broken relative to each other, and the raking resistance of the reef to the rake tooth is reduced;

[0043] The reef on the sand taking path is crushed through the linkage crushing mechanism, the crushed stone blocks pass through the rake head suction port and the rake tooth at the rear, the stress condition of the rake tooth and the blockage of the rake head by the large stone blocks are reduced, the construction efficiency is improved, and the maintenance cost of the rake head is reduced.

[0044] With reference to Figure 3 and Figure 4 , as a preferred technical solution of the present application, the cutting plate 506 is connected with a water guide block 5061 away from one end of the movable cover 2, and an upper inclined surface and a lower inclined surface are formed on one side of the water guide block 5061.

[0045] Specifically, the side surface of the water guide block 5061 is provided as an inclined surface, so as to reduce the forward resistance of the cutting plate 506 when the ship body sails.

[0046] With reference to Figure 1 and Figure 2 , as a preferred technical solution of the present application, the hydraulic cylinder 10 is fixedly arranged on the rake head body 1 through a support plate, and the piston rod of the hydraulic cylinder 10 is fixedly connected with the top of the working box 4.

[0047] Specifically, by controlling the operation of the hydraulic cylinder 10, the working box 4 is driven to move up and down by the piston rod of the hydraulic cylinder 10, the distance between the linkage crushing mechanism and the reef layer is adjusted, and the linkage crushing mechanism can be placed on the reef layer when the linkage crushing mechanism works, so as to improve the adaptability of the rake head.

[0048] With reference to Figure 1 and Figure 2 , as a preferred technical solution of the present application, the top of the movable cover 2 is provided with a sealing plate 11 for sealing the water inlet window, and the two sides of the movable cover 2 are provided with 80*100mm flow channels 12.

[0049] Specifically, by opening the 80*100mm flow channels 12 on the original rake head side plate and closing the water inlet window on the upper part of the movable cover 2, the effective range of the rake head on both sides can be increased and the water suction amount can be reduced, the fine sand within 1m on each side of the rake head is sucked into the movable cover 2 of the rake head, the working condition adaptability range of the rake head is enhanced, and the sand taking efficiency is improved.

[0050] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A sand taking bucket with a coral stone rubble device, comprising a bucket body (1) provided with a high pressure water flushing component, characterized in that, The rabble head body (1) is movably connected with a movable cover (2), a pin shaft (101) is arranged between the movable cover (2) and the rabble head body (1), the top of the movable cover (2) is connected with a steel wire rope (201), the end of the steel wire rope (201) away from the movable cover (2) is connected with a wave compensator arranged on a ship body, the bottom of the movable cover (2) is provided with a short rabble tooth (202), a flexible chain grid (3) is arranged between the rabble head body (1) and the movable cover (2), the end of the rabble head body (1) away from the movable cover (2) is provided with a linkage crushing mechanism, the linkage crushing mechanism comprises a working box (4), a crushing assembly arranged in the working box (4) for crushing rocks, a slitting assembly arranged in the working box (4) for slitting rock seabed, and a transmission assembly for connecting the crushing assembly and the slitting assembly; The slitting assembly comprises a first rotating shaft (501) rotatably connected in the working box (4), a plurality of first crank shafts (502) are arranged on the first rotating shaft (501), a first sleeve ring (503) is sleeved on the first crank shaft (502), a first connecting rod (504) is fixedly arranged on the first sleeve ring (503), a first sliding rod (505) slidably connected with the working box (4) is movably connected on the first connecting rod (504), and a slitting plate (506) is connected on the end of the first sliding rod (505) away from the first connecting rod (504); The crushing assembly comprises a second rotating shaft (601) rotatably connected in the working box (4), a plurality of second crank shafts (602) are arranged on the second rotating shaft (601), a second sleeve ring (603) is sleeved on the second crank shaft (602), a second connecting rod (604) is fixedly arranged on the second sleeve ring (603), a second sliding rod (605) slidably connected with the working box (4) is movably connected on the second connecting rod (604), and a crushing piece (606) is connected on the end of the second sliding rod (605) away from the second connecting rod (604), the second sliding rod (605) is composed of an upper rod body movably connected with the second connecting rod (604) and a lower rod body fixedly connected with the crushing piece (606), a rotating shaft is connected between the upper rod body and the lower rod body, and a torsional spring for driving the second sliding rod (605) to rotate and reset is sleeved on the rotating shaft; The transmission assembly comprises a driving motor (7) fixedly arranged in the working box (4), the output shaft of the driving motor (7) is connected with the first rotating shaft (501), a main gear (701) is arranged on the first rotating shaft (501), a secondary gear (702) rotatably connected in the working box (4) is meshed with the main gear (701), a transmission gear (703) is arranged on the secondary gear (702), and an upper gear (704) meshed with the transmission gear (703) is arranged on the second rotating shaft (601). The transmission gear (703) is arranged as a half gear, the lower gear (705) intermittently engaged with the transmission gear (703) is rotatably connected in the working box (4), the rotating rod (8) is fixedly arranged on the lower gear (705), the main bevel gear (801) is arranged on the rotating rod (8), the auxiliary bevel gear (802) engaged with the main bevel gear (801) is rotatably connected in the working box (4), the rotating rod (803) is arranged on the auxiliary bevel gear (802), the first connecting plate (804) is arranged on the rotating rod (803), the second connecting plate (805) is movably connected on the first connecting plate (804), the moving plate (806) is connected on the end of the second connecting plate (805) away from the first connecting plate (804), the limiting frame (807) is fixedly arranged on the moving plate (806), and the limiting frame (807) is movably abutted with the second sliding rod (605).

2. A sand scooping head with a coral reef rock breaking device according to claim 1, characterized in that, The water guide block (5061) is connected on the end of the slitting plate (506) away from the movable cover (2), and the upper inclined surface and the lower inclined surface are formed on one side of the water guide block (5061).

3. A sand reclamation drag head having a coral stone breaking device as claimed in claim 1, wherein, The breaking piece (606) comprises the breaking ball (6061) fixedly connected with the lower rod body of the second sliding rod (605) and the breaking inserting rod (6062) fixedly connected with the breaking ball (6061).

4. A sand reclamation drag according to claim 1 having a coral stone breaking device, characterised in that, The moving plate (806) is slidably connected in the guide plate (9) fixedly arranged on the bottom of the working box (4).

5. A sand reclamation drag according to claim 1, wherein, The hydraulic cylinder (10) is fixedly arranged on the rake head body (1) through the supporting plate, and the piston rod of the hydraulic cylinder (10) is fixedly connected with the top of the working box (4).

6. A sand reclamation drag according to claim 1 having a coral head rock breaking device, characterised in that, The sealing plate (11) for sealing the water inlet window is arranged on the top of the movable cover (2), and the flow channel (12) with the size of 80*100mm is arranged on the two sides of the movable cover (2).

Images