Sand taking rake head with coral reef stone crushing device

Abstract

The invention discloses a sand taking rake head with a coral reef stone crushing device, and belongs to the technical field of rake heads. A sand taking drag head with a coral reef stone crushing device comprises a drag head body provided with a high-pressure flushing component, a movable cover is movably connected to the drag head body, a pin shaft is arranged between the movable cover and the drag head body, a steel wire rope is connected to the top of the movable cover, and the end, away from the movable cover, of the steel wire rope is connected with a wave compensator arranged on a ship body. Short rake teeth are arranged at the bottom of the movable cover, a flexible chain grid is arranged between the rake head body and the movable cover, and a linkage crushing mechanism is arranged at the end, away from the movable cover, of the rake head body; according to the invention, rocks are crushed, and the crushed rocks pass through the rake head suction port and the rake teeth at the rear part, so that the stress condition of the rake teeth and the condition that the rake head is blocked by large rocks are reduced, the construction efficiency is improved, and the loss and maintenance cost of the rake head is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of rake heads, in particular to a sand collecting rake head with a coral reef stone crushing device. Background Art

[0002] At present, dredging refers to the process of digging up underwater earthworks such as mud, sand, and rocks by manual, hydraulic, and mechanical means and transporting them to other places. A trailing suction dredger is a large self-propelled, cabin-type dredger equipped with a trailing dredging machine and a hydraulic dredging device. The trailing dredger is connected to the hull through the trailing arm, which can move up and down. The rear end of the trailing arm is placed underwater at a certain depth so that the trailing head contacts the dredging working surface of the underwater soil layer.

[0003] With the increasing demand for construction of coastal offshore and islands and reefs, the amount of sand used for infrastructure construction has gradually increased. Many sand sources are distributed in the deep sea and are located in the sea area surrounded by coral reefs. There are a large number of finger-shaped and disc-shaped corals growing on the sand source seabed. The coral reefs are hard in texture. Due to the hardness and irregular distribution of coral reefs, it is very easy for a few or some of the rake teeth and rake tooth seats to be under the full drag force when dragging and dredging, which can easily damage the rake teeth and tooth seats; and the large size of coral particles is extremely unfavorable for the suction dredger to take sand and load it into the cabin. The coral reefs are easily stuck in the rake head grille, resulting in a sharp decrease in the rake head flow channel after the rake head is blocked, and the underwater mud pump vibrates abnormally, which is inefficient and threatens the safety of the equipment. In addition, it is necessary to stop the pump and start the rake to clean the coral reefs stuck on the rake head, which is time-consuming and labor-intensive, and increases the labor intensity of personnel. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a sand rake head with a coral reef stone crushing device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A sand rake head with a coral reef crushing device comprises a rake head main body provided with a high-pressure water flushing component, a movable cover movably connected to the rake head main body, a pin shaft is arranged between the movable cover and the rake head main body, a steel wire rope is connected to the top of the movable cover, an end of the steel wire rope away from the movable cover is connected to a wave compensator arranged on a hull, short rake teeth are arranged at the bottom of the movable cover, a flexible chain grid is arranged between the rake head main body and the movable cover, a linkage crushing mechanism is arranged at the end of the rake head main body away from the movable cover, and the linkage crushing mechanism comprises a working box, a crushing assembly arranged in the working box for crushing reefs, a cutting assembly arranged in the working box for cutting the reef seabed, and a transmission assembly for connecting the crushing assembly and the cutting assembly.

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

[0008] Preferably, one end of the dividing plate away from the movable cover is connected to a water guide block, and one side of the water guide block is provided with an upper inclined surface and a lower inclined surface.

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

[0010] Preferably, the crushing member includes a crushing ball fixedly connected to the lower rod body of the second sliding rod and a crushing plug fixedly connected to the crushing ball.

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

[0012] Preferably, the transmission gear is configured as a half gear, and the working box is rotatably connected with a lower gear intermittently meshing with the transmission gear, the lower gear is fixedly provided with a rotating rod, and a main bevel gear is provided on the rotating rod, and a secondary bevel gear meshing with the main bevel gear is rotatably connected with the working box, and a rotating rod is provided on the secondary bevel gear, and a first connecting plate is provided on the rotating rod, and a second connecting plate is movably connected to the first connecting plate, and a movable plate is connected to the end of the second connecting plate away from the first connecting plate, and a limit frame is fixedly provided on the movable plate, and the limit frame is movably resisted against the second sliding rod.

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

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

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

[0016] Compared with the prior art, the present invention provides a sand rake head with a coral reef stone crushing device, which has the following beneficial effects:

[0017] 1. The sand rake head with a coral reef stone crushing device is provided with a linkage crushing mechanism to crush the reefs on the sand taking path. The crushed stones pass through the suction port and rake teeth at the rear of the rake head, thereby reducing the stress on the rake teeth and the occurrence of large stones blocking the rake head, thereby improving construction efficiency and reducing the loss and maintenance cost of the rake head.

[0018] 2. The sand-taking rake head with a coral reef stone crushing device can increase the range of action on both sides of the rake head and reduce the amount of water absorption by opening an 80×100mm flow channel on the original rake head side plate and closing the water diversion window on the upper part of the movable cover, so as to suck the powdery sand within a range of 1 meter on each side of the rake head into the rake head movable cover, thereby enhancing the adaptability of the rake head to working conditions and improving the sand-taking efficiency.

[0019] 3. The sand rake head with a coral reef stone crushing device adopts a flexible chain grille. During the rake suction construction process, with the impact of coral reef stones and the scouring effect caused by the high-speed passage of mud, the flexible chain grille itself is in a continuous vibration environment, and the stones are not easy to get stuck on the flexible chain grille, or the stones can fall off by themselves under the vibration and scouring after getting stuck, which improves the problems existing in the traditional steel plate grille during construction, prevents stones and other debris from entering the rake pipe and clogging the mud pump, and can move the rake head cover after the rake head is blocked, and use the elasticity of the chain to make the debris fall, thereby reducing the probability of stopping work due to debris blocking the rake head and the number of manual cleaning times. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0021] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0022] Figure 3 It is a structural schematic diagram of the linkage crushing mechanism of the present invention;

[0023] Figure 4 For the present invention Figure 3 A partial enlarged structural diagram of the middle part;

[0024] Figure 5 It is a partial structural schematic diagram of the working box of the present invention;

[0025] Figure 6For the present invention Figure 5 A schematic diagram of the partially enlarged structure of the middle B part;

[0026] Figure 7 It is a schematic structural diagram of the transmission assembly of the present invention.

[0027] In the figure: 1, main body of the rake head; 101, pin shaft; 2, movable cover; 201, wire rope; 202, short rake teeth; 3, flexible chain grille; 4, working box; 501, first rotating shaft; 502, first crank shaft; 503, first ring; 504, first connecting rod; 505, first slide bar; 506, cutting plate; 5061, water guide block; 601, second rotating shaft; 602, second crank shaft; 603, second ring; 604, second connecting rod; 605, second slide bar; 606 06. Crushing parts; 6061. Crushing balls; 6062. Crushing rods; 7. Driving motors; 701. Main gears; 702. Sub-gears; 703. Transmission gears; 704. Upper gears; 705. Lower gears; 8. Rotating rods; 801. Main bevel gears; 802. Sub-bevel gears; 803. Rotating rods; 804. First connecting plate; 805. Second connecting plate; 806. Moving plate; 807. Limiting frame; 9. Guide plate; 10. Hydraulic cylinder; 11. Closing plate; 12. Flow channel. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two components; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Example: Refer to Figure 1 and Figure 2 A sand rake head with a coral reef crushing device comprises a rake head body 1 provided with a high-pressure water flushing component, a movable cover 2 is movably connected to the rake head body 1, a pin shaft 101 is arranged between the movable cover 2 and the rake head body 1, a steel wire rope 201 is connected to the top of the movable cover 2, an end of the steel wire rope 201 away from the movable cover 2 is connected to a wave compensator arranged on the hull, a short rake tooth 202 is arranged at the bottom of the movable cover 2, a flexible chain grid 3 is arranged between the rake head body 1 and the movable cover 2, and a linkage crushing mechanism is arranged at one end of the rake head body 1 away from the movable cover 2, the linkage crushing mechanism comprises a working box 4, a crushing assembly arranged in the working box 4 for crushing reefs, a cutting assembly arranged in the working box 4 for cutting the reef seabed, and a transmission assembly for connecting the crushing assembly and the cutting assembly.

[0032] Specifically, the present application connects the movable cover 2 and the wave compensator on the hull through a steel wire rope 201. The movable cover 2 enables the follow-up mode and can automatically adjust the angle relative to the rake head body 1 to avoid frequent manual operation using hydraulic equipment, so as to achieve the fit between the movable cover 2 and the seabed surface and the cutting of the short rake teeth 202 into the mud and sand. The rake teeth at the bottom of the original movable cover 2 are shortened to short rake teeth 202, and the length of the short rake teeth 202 is 250mm to reduce the torque; by adopting the flexible chain grille 3, the grille spacing is changed from 340*280mm to 200*200mm. During the rake suction construction, with the impact of coral reef blocks and the scouring effect caused by the high-speed passage of mud, the flexible chain grille 3 itself is in a In a continuously vibrating environment, it is not easy for stones to get stuck on the flexible chain grille 3, or after getting stuck, the stones can fall off by themselves under the action of vibration and scouring, which improves the problems existing in the construction of traditional steel plate grilles, and prevents stones and other debris from entering the rake pipe and clogging the mud pump. After the rake head is blocked, the rake head cover can be moved to make the debris fall by utilizing the elasticity of the chain, thereby reducing the probability of shutdown caused by debris blocking the rake head and the number of manual cleaning times; by setting up a linkage crushing mechanism, the reefs on the sand extraction path are crushed, and the crushed stones pass through the rear rake head suction port and rake teeth, thereby reducing the stress on the short rake teeth 202 and the occurrence of large stones blocking the rake head, thereby improving the construction efficiency and reducing the loss and maintenance cost of the rake head.

[0033] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As a preferred technical solution of the present invention, the slitting assembly includes a first rotating shaft 501 rotatably connected to the working box 4, a plurality of first crank shafts 502 are arranged on the first rotating shaft 501, a first sleeve 503 is arranged on the first crank shaft 502, a first connecting rod 504 is fixedly arranged on the first sleeve 503, a first sliding rod 505 sliding with the working box 4 is movably connected to the first connecting rod 504, and a slitting plate 506 is connected to the end of the first sliding rod 505 away from the first connecting rod 504.

[0034] Furthermore, the crushing assembly includes a second rotating shaft 601 rotatably connected to the working box 4, a plurality of second crank shafts 602 are arranged on the second rotating shaft 601, a second ring 603 is sleeved on the second crank shaft 602, a second connecting rod 604 is fixedly arranged on the second ring 603, a second connecting rod 604 is movably connected to a second slide bar 605 that slides with the working box 4, and a crushing piece 606 is connected to the end of the second slide bar 605 away from the second connecting rod 604. The second slide bar 605 is composed of an upper rod body movably connected to the second connecting rod 604 and a lower rod body fixedly connected to the crushing piece 606. A rotating shaft is connected between the upper rod body and the lower rod body, and a torsion spring is sleeved on the rotating shaft for driving the second slide bar 605 to reset and rotate.

[0035] Furthermore, the crushing member 606 includes a crushing ball 6061 fixedly connected to the lower rod body of the second sliding rod 605 and a crushing plug 6062 fixedly connected to the crushing ball 6061 .

[0036] Furthermore, the transmission assembly includes a driving motor 7 fixed in the working box 4, the output shaft of the driving motor 7 is connected to the first rotating shaft 501, a main gear 701 is provided on the first rotating shaft 501, a sub-gear 702 meshing with the main gear 701 is rotatably connected in the working box 4, a transmission gear 703 is provided on the sub-gear 702, and an upper gear 704 meshing with the transmission gear 703 is provided on the second rotating shaft 601.

[0037] Furthermore, the transmission gear 703 is configured as a half gear, and a lower gear 705 intermittently meshing with the transmission gear 703 is rotatably connected in the working box 4, and a rotating rod 8 is fixed on the lower gear 705, and a main bevel gear 801 is provided on the rotating rod 8, and a secondary bevel gear 802 meshing with the main bevel gear 801 is rotatably connected in the working box 4, and a rotating rod 803 is provided on the secondary bevel gear 802, and a first connecting plate 804 is provided on the rotating rod 803, and a second connecting plate 805 is movably connected to the first connecting plate 804, and a movable plate 806 is connected to the end of the second connecting plate 805 away from the first connecting plate 804, and a limit frame 807 is fixed on the movable plate 806, and the limit frame 807 is movably opposed to the second sliding bar 605.

[0038] Furthermore, a guide plate 9 is fixedly provided at the bottom of the working box 4 , and the movable plate 806 is slidably connected in the guide plate 9 .

[0039] Specifically, when the linkage crushing mechanism is working, the driving motor 7 is controlled to operate, and the output shaft of the driving motor 7 drives the first rotating shaft 501 to rotate. When the first rotating shaft 501 rotates, it drives the main gear 701 to mesh with the sub-gear 702 for transmission, and the sub-gear 702 drives the transmission gear 703 to rotate, and the transmission gear 703 alternately meshes with the upper gear 704 and the lower gear 705 for transmission;

[0040] When the transmission gear 703 is meshed with the upper gear 704, the upper gear 704 drives the second crankshaft 602 to rotate through the second rotating shaft 601. When the second crankshaft 602 rotates, it drives the second ring 603 to rotate. The second ring 603 drives the second slide bar 605 to slide up and down relative to the working box 4 through the second connecting rod 604. When the second slide bar 605 moves downward, the bottom reef is crushed by the crushing member 606. The crushing plug 6062 first breaks the surface with a point, which is convenient for quickly inserting the reef to break the reef. As the second slide bar 605 continues to move downward, the crushing ball 6061 further crushes the broken reef.

[0041] When the transmission gear 703 is no longer meshed with the upper gear 704, the transmission gear 703 meshes with the lower gear 705 for transmission, and the lower gear 705 drives the main bevel gear 801 to mesh with the secondary bevel gear 802 for transmission, and the secondary bevel gear 802 drives the first connecting plate 804 to rotate, and the first connecting plate 804 drives the movable plate 806 to move horizontally through the second connecting plate 805, and the movable plate 806 slides in the guide plate 9. When the movable plate 806 moves back and forth horizontally, it drives the limit frame 807 to push the lower rod body of the second slide rod 605 moved out of the working box 4, so that the lower rod body drives the crushing plug 6062 to swing in the reef layer, so that the reef layer is loosened, and as the transmission gear 703 continues to rotate, the transmission gear 703 is no longer meshed with the lower gear 705 but meshed with the upper gear 704, and the crushing work of the reef is repeated;

[0042] When the first rotating shaft 501 rotates, the second ring 603 is driven to rotate through the second crank shaft 602, and the second ring 603 drives the second slide bar 605 to move up and down relative to the working box 4 through the second connecting rod 604, so that when the second slide bar 605 moves downward, the adhered reef layers are cut through the cutting plate 506, so that the reef layers are broken from each other, thereby reducing the subsequent rake teeth's raking resistance to the reefs;

[0043] The present application sets up a linkage crushing mechanism to crush the reefs on the sand taking path. The crushed stones then pass through the suction port and rake teeth of the rear rake head, thereby reducing the stress on the rake teeth and the occurrence of large stones blocking the rake head, thereby improving construction efficiency and reducing the wear and tear and maintenance costs of the rake head.

[0044] Reference Figure 3 and Figure 4 As a preferred technical solution of the present invention, one end of the dividing plate 506 away from the movable cover 2 is connected to a water guide block 5061, and one side of the water guide block 5061 is provided with an upper inclined surface and a lower inclined surface.

[0045] Specifically, the side surface of the water guide block 5061 is set to be an inclined surface to reduce the forward resistance encountered by the cutting plate 506 when sailing with the hull.

[0046] Reference Figure 1 and Figure 2 As a preferred technical solution of the present invention, a hydraulic cylinder 10 is fixedly provided on the rake head body 1 through a support plate, and a piston rod of the hydraulic cylinder 10 is fixedly connected to the top of the working box 4.

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

[0048] Reference Figure 1 and Figure 2 As a preferred technical solution of the present invention, a sealing plate 11 for sealing the water diversion window is provided on the top of the movable cover 2, and a flow channel 12 of 80*100 mm is provided on both sides of the movable cover 2.

[0049] Specifically, by opening a 80×100mm flow channel 12 on the original rake head side plate and closing the water diversion window on the upper part of the movable cover 2, the range of action on both sides of the rake head can be increased and the water absorption can be reduced, and the fine sand within 1 meter on each side of the rake head can be sucked into the rake head movable cover 2, thereby enhancing the adaptability of the rake head working conditions and improving the sand removal efficiency.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sand rake head with a coral reef rock crushing device, comprising a rake head body (1) provided with a high-pressure water flushing component, characterized in that: A movable cover (2) is movably connected to the drag head body (1), a pin shaft (101) is arranged between the movable cover (2) and the drag head body (1), a steel wire rope (201) is connected to the top of the movable cover (2), one end of the steel wire rope (201) away from the movable cover (2) is connected to a wave compensator arranged on the hull, and short rake teeth (202) are arranged at the bottom of the movable cover (2), a flexible chain grid (3) is arranged between the drag head body (1) and the movable cover (2), and a linkage crushing mechanism is arranged at one end of the drag head body (1) away from the movable cover (2), and the linkage crushing mechanism comprises a working box (4), a crushing assembly arranged in the working box (4) for crushing reefs, a cutting assembly arranged in the working box (4) for cutting reef seabed, and a transmission assembly for connecting the crushing assembly and the cutting assembly.

2. A sand rake head with a coral reef rock crushing device according to claim 1, characterized in that: The slitting assembly includes a first rotating shaft (501) rotatably connected to the working box (4), a plurality of first crank shafts (502) are arranged on the first rotating shaft (501), a first sleeve (503) is arranged on the first crank shaft (502), a first connecting rod (504) is fixedly arranged on the first sleeve (503), the first connecting rod (504) is movably connected to a first sliding rod (505) that slides with the working box (4), and a slitting plate (506) is connected to the end of the first sliding rod (505) away from the first connecting rod (504).

3. A sand rake head with a coral reef rock crushing device according to claim 2, characterized in that: One end of the dividing plate (506) away from the movable cover (2) is connected to a water guide block (5061), and one side of the water guide block (5061) is provided with an upper inclined surface and a lower inclined surface.

4. A sand rake head with a coral reef rock crushing device according to claim 3, characterized in that: The crushing assembly comprises a second rotating shaft (601) rotatably connected to the working box (4), a plurality of second crank shafts (602) are arranged on the second rotating shaft (601), a second sleeve (603) is sleeved on the second crank shaft (602), a second connecting rod (604) is fixedly arranged on the second sleeve (603), a second sliding rod (605) movably connected to the second connecting rod (604) and sliding with the working box (4), a crushing piece (606) is connected to one 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 to the second connecting rod (604) and a lower rod body fixedly connected to the crushing piece (606), a rotating shaft is connected between the upper rod body and the lower rod body, and a torsion spring is sleeved on the rotating shaft for driving the second sliding rod (605) to return and rotate.

5. The sand rake head with a coral reef rock crushing device according to claim 4, characterized in that: The crushing member (606) comprises a crushing ball (6061) fixedly connected to the lower rod body of the second sliding rod (605) and a crushing plug rod (6062) fixedly connected to the crushing ball (6061).

6. A sand rake head with a coral reef rock crushing device according to claim 5, characterized in that: The transmission assembly comprises a driving motor (7) fixedly arranged in a working box (4); an output shaft of the driving motor (7) is connected to a 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).

7. A sand rake head with a coral reef rock crushing device according to claim 6, characterized in that: The transmission gear (703) is configured as a half gear, a lower gear (705) intermittently meshing with the transmission gear (703) is rotatably connected in the working box (4), a rotating rod (8) is fixed on the lower gear (705), a main bevel gear (801) is provided on the rotating rod (8), a secondary bevel gear (802) meshing with the main bevel gear (801) is rotatably connected in the working box (4), a rotating rod (803) is provided on the secondary bevel gear (802), a first connecting plate (804) is provided on the rotating rod (803), a second connecting plate (805) is movably connected to the first connecting plate (804), a movable plate (806) is connected to the end of the second connecting plate (805) away from the first connecting plate (804), a limit frame (807) is fixed on the movable plate (806), and the limit frame (807) is movably opposed to the second sliding rod (605).

8. The sand rake head with a coral reef rock crushing device according to claim 7, characterized in that: A guide plate (9) is fixedly provided at the bottom of the working box (4), and the movable plate (806) is slidably connected inside the guide plate (9).

9. A sand rake head with a coral reef rock crushing device according to claim 8, characterized in that: A hydraulic cylinder (10) is fixedly arranged on the rake head body (1) via a support plate, and a piston rod of the hydraulic cylinder (10) is fixedly connected to the top of the working box (4).

10. The sand rake head with a coral reef rock crushing device according to claim 1, characterized in that: A sealing plate (11) for sealing the water diversion window is arranged on the top of the movable cover (2), and flow channels (12) of 80*100 mm are arranged on both sides of the movable cover (2).

Images