A low-disturbance counter-paving insulation layer for dredging of bituminous sand

Abstract

The present application relates to the technical field of bitumen-containing sand dredging equipment, and particularly relates to a low-disturbance reverse-paving isolation layer rake head for bitumen-containing sand dredging, the end of a feeding pipe is in communication with the outer shell, a moving plate is in sliding sealing connection in the outer shell, the end of a plurality of spigots is in rectangular array connection on the moving plate and is arranged towards the feeding pipe, the other end of the spigot is in sliding sealing in a guide pipe, a plurality of waist-type holes are formed through the side wall of the spigot end, one end of the waist-type hole is arranged in a conical pipe, the end of the guide pipe is in communication with the end of the conical pipe, the other end of the conical pipe is in communication with the outer shell, a buffer mechanism is arranged between the outer shell and the moving plate, the moving plate preliminarily buffers the impact of clean sand, the conical pipe disperses the discharging direction when reverse paving is implemented, and the impact force of the clean sand output by the spigot through the waist-type hole is dispersed, so that the phenomenon that oil phase and fine particles re-enter the water body to cause pollution occurs when reverse paving is implemented can be avoided.

Description

Technical Field

[0001] This invention relates to the field of equipment technology for dredging equipment containing asphalt sand, and particularly to a low-disturbance reverse-laying isolation layer rake head for dredging asphalt sand. Background Technology

[0002] Asphalt-sand strata consist of sand grains, fine particles, and high-viscosity oil phases that form a stable oil-sand structure through physical adhesion and interfacial tension. Under natural conditions, the oil phase is bound within the particle skeleton and does not easily enter the water body. However, mechanical disturbance, cutting, and tumbling during dredging can damage this structure, causing the oil phase to peel off and enter the water body, resulting in engineering-induced oil pollution. Backfilling with clean sand is a key step in preventing the release of the oil phase. However, existing backfilling equipment mostly uses discharge pipes or ordinary rake heads to directly spray / pour sand to the bottom of the pit at high speed, forming a downward jet. Its momentum and shearing action can easily cause secondary disturbance to the asphalt-sand layer, destroy the overburden layer, and stir the oil phase and fine particles back into the water body, thus leading to serious water pollution. Summary of the Invention

[0003] The present invention provides a low-disturbance reverse-laying isolation layer rake head for dredging asphalt sand, in order to solve the problems mentioned in the background art.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a low-disturbance backfill isolation layer rake head for dredging asphalt sand, comprising: a shell, a feed pipe, a moving plate, a guide pipe, a tapered pipe, an insert pipe, and waist-shaped holes. The end of the feed pipe is connected to the shell. The moving plate is slidably and sealed inside the shell. Multiple insert pipe ends are connected in a rectangular array on the moving plate and are oriented towards the feed pipe. The other end of the insert pipe is slidably and sealed inside the guide pipe. Multiple waist-shaped holes are provided through the side wall of the insert pipe end. One end of the waist-shaped hole is placed inside the tapered pipe. The end of the guide pipe is connected to the end of the tapered pipe. The other end of the tapered pipe is connected to the shell. A buffer mechanism is provided between the shell and the moving plate.

[0005] Preferably, the diameter of the end of the tapered tube furthest from the feed tube is larger than the diameter of its other end.

[0006] Preferably, the buffer mechanism includes: a tube body, a second tube body, and a spring. The side wall of the moving plate away from the feed pipe and the outer shell form a working cavity. The side wall of the moving plate is connected to the ends of multiple tube bodies. The other end of each tube body is slidably connected to the end of the second tube body. The other end of the second tube body is connected to the outer shell. The tube body and the second tube body are placed in the working cavity. The two ends of the spring are respectively connected to the inner wall of the end of the tube body and the inner wall of the other end of the second tube body.

[0007] Preferably, the side wall of the movable plate is connected to the end of a push rod, the push rod is slidably and sealed to the outer shell, the other end of the push rod is hinged to a slider, the slider is longitudinally slidably connected in the slide rail, the slide rail is connected to the end face of the buffer baffle, the end face of the buffer baffle is set towards the tapered tube, the top of the buffer baffle is hinged to the outer shell, and the bottom of the buffer baffle is set away from the outer shell.

[0008] Preferably, the slider has a through hole running longitudinally through it, and the inner walls of the top and bottom ends of the through hole are chamfered.

[0009] Preferably, the housing is provided with two baffles to seal the end of the feed pipe. The side of the baffle is connected to a sleeve, which is rotatably connected to the insertion rod. The insertion rod is connected to the housing. A torsion spring is connected between the sleeve and the housing. The ends of the two baffles away from the sleeves are in contact with each other and sealed.

[0010] Preferably, the system also includes a cleaning component, which comprises a cleaning pipe, an annular pipe, and a cleaning input pipe. The end of the cleaning pipe is connected to the side wall of the annular pipe, which surrounds the outer casing. The bottom inner wall of the annular pipe is connected to the ends of multiple cleaning input pipes. The other end of the cleaning input pipe is connected to the bottom wall of the outer casing and faces the moving plate. A one-way valve is connected inside the cleaning pipe, and a second one-way valve is connected inside the cleaning input pipe.

[0011] Preferably, the other side wall of the annular tube is connected to the end of the control tube, and the other end of the control tube, which is placed inside the housing, is connected to the top side wall of the horizontal tube. The horizontal tube is fixed inside the housing, and two pistons are slidably and sealed inside the horizontal tube. The other end of the control tube is set towards the side wall of the piston. The end of the second spring is connected to the side wall of the piston away from the other end of the control tube, and the end of the L-shaped push rod is connected to the side wall of the piston. The L-shaped push rod is slidably and sealed to the horizontal tube.

[0012] Preferably, the bottom end of the vertical part of the L-shaped push rod outside the horizontal tube is connected to a second slider, which slides in a groove. The groove is opened on the drive plate, and one end of the drive plate is rotatably connected to the inner wall of the outer shell.

[0013] Preferably, the other end of the drive plate is disposed toward the side wall of the moving plate away from the feed pipe, and the other ends of the two drive plates are disposed facing each other.

[0014] The beneficial effects of this invention are as follows: In the solution of this invention: 1. The movable plate initially buffers the impact of the clean sand, and the tapered pipe disperses the discharge direction during the reverse laying process. At the same time, the impact force of the clean sand is dispersed when the pipe is inserted and output through the waist-shaped hole. This can prevent the oil phase and fine particles from re-entering the water body and causing pollution during the reverse laying process. 2. It avoids the phenomenon of continuous entrainment and diffusion of oil phase by the vortex generated by high-speed injection and the backflow field; 3. While backfilling the cleaning sand, the position of the outer shell in the water is controlled to make the device adapt to the terrain and characteristics of the dredging pit bottom, irregular slope, etc., so that a continuous and uniformly thick covering layer can be formed on the backfilling working surface, which is not easy to expose the bottom or accumulate, and at the same time avoids the formation of weak areas for oil phase leakage. 4. The device has a simple structure and high working efficiency, and can replace existing reverse-laying equipment that heavily relies on complex hydraulic, sensor or control systems, and can work in high-adhesion and high-oil environments; 5. While solving the problem of material backfilling disturbance, the tapered tube is less prone to oil clogging in high-adhesion, high-oil-content environments, which can lead to material discharge failure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram showing the location of the tapered tube in this invention; Figure 3 This is a schematic diagram of the buffer mechanism structure of the present invention; Figure 4 This is a cross-sectional view of the outer casing of the present invention; Figure 5 This is a schematic diagram showing the location of the through hole in this invention; Figure 6 This is a schematic diagram of the baffle structure of the present invention; Figure 7 This is a schematic diagram showing the connection relationship between the cleaning pipe, the annular pipe, and the cleaning input pipe of the present invention; Figure 8 This is a schematic diagram showing the connection relationship between the cleaning tube and the control tube of the present invention; Figure 9 This is a schematic diagram showing the connection between the control tube and the horizontal tube in this invention; Figure 10 This is a cross-sectional view of the horizontal tube of the present invention; Figure 11 This is a schematic diagram showing the location of the slide groove on the drive plate according to the present invention.

[0016] The components include: outer shell 1, feed pipe 2, moving plate 3, guide pipe 4, tapered pipe 5, insertion pipe 6, waist-shaped hole 7, buffer mechanism 8, pipe body 9, pipe body II 10, spring 11, push rod 12, slider 13, slide rail 14, buffer baffle 15, through hole 16, chamfer 17, baffle 18, sleeve 19, insertion rod 20, torsion spring 21, cleaning pipe 22, annular pipe 23, cleaning input pipe 24, control pipe 25, horizontal pipe 26, piston 27, spring II 28, L-shaped push rod 29, slide groove 31, and drive plate 32. Detailed Implementation

[0017] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0018] Example 1: Reference Figures 1-11 A low-disturbance backfill isolation layer rake head for dredging asphalt sand includes: a shell 1, a feed pipe 2, a moving plate 3, a guide pipe 4, a tapered pipe 5, an insert pipe 6, and a waist-shaped hole 7. The end of the feed pipe 2 is connected to the shell 1. The moving plate 3 is slidably and sealed inside the shell 1. The ends of multiple insert pipes 6 are connected in a rectangular array on the moving plate 3 and are oriented towards the feed pipe 2. The other end of the insert pipe 6 is slidably and sealed inside the guide pipe 4. Multiple waist-shaped holes 7 are opened through the side wall of the end of the insert pipe 6. One end of the waist-shaped hole 7 is placed inside the tapered pipe 5. The end of the guide pipe 4 is connected to the end of the tapered pipe 5. The other end of the tapered pipe 5 is connected to the shell 1. A buffer mechanism 8 is provided between the shell 1 and the moving plate 3.

[0019] The diameter of the end of the tapered tube 5 furthest from the feed tube 2 is larger than the diameter of its other end.

[0020] The principles and beneficial effects of the above scheme are as follows: The device is connected to the hull, and the outer shell 1 is suspended by steel wire ropes on the hull. During operation, the position of the outer shell 1 below the water surface is controlled by releasing or retracting the steel wire ropes. When implementing the backfilling of clean sand, the sand bin on the hull, in conjunction with the existing pump equipment, pumps clean sand containing moisture into the feed pipe 2. When the clean sand enters the outer shell 1, it first contacts the moving plate 3. The moving plate 3 moves away from the feed pipe 2. At this time, the buffer mechanism 8 is activated, and the moving plate 3 provides initial buffering against the impact of the clean sand. Subsequently, the clean sand passes through... The insertion tube 6 enters the conical tube 5 and is discharged to the designated reverse-laying working surface to cover the oil phase and fine particles, preventing them from re-entering the water body and causing pollution. When the pump pressure increases during pumping, the moving plate 3 will move further away from the feed pipe 2. At this time, the area of ​​the waist-shaped hole 7 inside the conical tube 5 is further increased. A portion of the cleaning sand enters the conical tube 5 through the waist-shaped hole 7, avoiding direct impact on the reverse-laying working surface. The conical tube 5 further disperses the discharge direction of the cleaning sand, preventing the occurrence of high-speed jets. After the work is completed, the feed pipe 2 stops conveying cleaning sand into the outer shell 1 and the buffer mechanism 8 resets, which drives the moving plate 3 to reset. The setting of the guide pipe 4 can increase the stability of the insertion pipe 6 when it moves. The movable plate 3 initially buffers the impact of the cleaning sand, and the tapered pipe 5 disperses the discharge direction during the back-laying process. At the same time, the impact force of the cleaning sand output by the insertion pipe 6 is dispersed through the waist-shaped hole 7. This can prevent the phenomenon of oil phase and fine particles re-entering the water body and causing pollution during the back-laying process. At the same time, it avoids the phenomenon of continuous entrainment and diffusion of oil phase by the vortex generated by high-speed injection and the backflow field. While backfilling the cleaning sand, the position of the outer shell 1 in the water is controlled to make the device adapt to the terrain and characteristics of the dredging pit bottom, irregular slope, etc., so that a continuous and uniformly thick covering layer can be formed on the backfilling working surface, which is not easy to expose the bottom or accumulate, and at the same time avoids the formation of weak areas for oil phase leakage. The device has a simple structure and high working efficiency, and can replace existing reverse-laying equipment that heavily relies on complex hydraulic, sensor or control systems, and can work in high-adhesion and high-oil environments. While solving the problem of material backfilling disturbance, the tapered tube 5 is less prone to oil clogging of the discharge structure and discharge failure in high adhesion and high oil content environments.

[0021] Example 2: Reference Figures 1-11 The buffer mechanism 8 includes a tube 9, a second tube 10, and a spring 11. The side wall of the moving plate 3 away from the feed pipe 2 forms a working chamber with the outer shell 1. Multiple tubes 9 are connected to the ends of the moving plate 3. The other end of each tube 9 is slidably connected to the end of the second tube 10. The other end of the second tube 10 is connected to the outer shell 1. The tubes 9 and 10 are placed in the working chamber. The two ends of the spring 11 are connected to the inner wall of the end of the tube 9 and the inner wall of the other end of the second tube 10, respectively. When the moving plate 3 is impacted by cleaning sand, the tube 9 moves towards the second tube 10, and the spring 11 is compressed. When the impact on the moving plate 3 ends, the spring 11 returns to its original position, and the tube 9 moves back to its original position. At the same time, because the moving plate 3 slides and seals with the inner wall of the outer shell 1, and the tubes 9 and 10 are placed in the working chamber, the tubes 9 and 10 will not be impacted by cleaning sand or corroded by moisture, thus extending the working life of the mechanism.

[0022] Example 3: Reference Figures 1-11 The side wall of the movable plate 3 is connected to the end of the push rod 12. The push rod 12 is slidably and sealed to the outer shell 1. The other end of the push rod 12 is hinged to the slider 13. The slider 13 is longitudinally slidably connected in the slide rail 14. The slide rail 14 is connected to the end face of the buffer baffle 15. The end face of the buffer baffle 15 is set towards the tapered tube 5. The top of the buffer baffle 15 is hinged to the outer shell 1, and the bottom of the buffer baffle 15 is set away from the outer shell 1. The moving plate 3, moving away from the feed pipe 2, synchronously drives the push rod 12 to move. The push rod 12 further drives the slider 13, which is hinged to it, to move. The slider 13 moves downward within the slide rail 14. At this time, under the hinged cooperation between the outer shell 1 and the top of the buffer baffle 15, the bottom of the buffer baffle 15 will move further away from the outer shell 1. The buffer baffle 15 can not only buffer the cleaning sand output from the device, but also guide its movement direction. As the moving distance of the moving plate 3 increases, the bottom of the buffer baffle 15 will move further away from the bottom of the outer shell 1, so as to further buffer the output of the cleaning sand. After the device finishes working, the moving plate 3 resets, which drives the push rod 12 to reset, and the slider 13 resets simultaneously. The slider 13 slides upward in the slide rail 14, and the buffer baffle 15 resets.

[0023] Example 4: Reference Figures 1-11 To prevent the output cleaning sand from damaging or obstructing the friction surfaces of the slider 13 and the slide rail 14, a through hole 16 is longitudinally opened on the slider 13 to allow the sprayed cleaning sand to pass through. Furthermore, the inner walls of the top and bottom ends of the through hole 16 are chamfered 17 to prevent the cleaning sand from accumulating on the slider 13, thereby improving the passage effect of the cleaning sand. By utilizing the movement of the slider 13 and the chamfered 17 on the inner walls of the top and bottom ends of the through hole 16, the cleaning sand remaining on the slide rail 14 can be cleaned in a timely manner to avoid damage to the device or failure of the mechanism to reset.

[0024] Example 5: Reference Figures 1-11 The outer casing 1 is equipped with two baffles 18 to seal the end of the feed pipe 2. A sleeve 19 is connected to the side of the baffle 18, and the sleeve 19 is rotatably connected to the insertion rod 20. The insertion rod 20 is connected inside the outer casing 1. A torsion spring 21 is connected between the sleeve 19 and the outer casing 1. The ends of the two baffles 18 away from the sleeve 19 are in contact with each other and sealed. When the device starts to receive cleaning sand pumped from the hull, the baffle 18 opens under pressure, the sleeve 19 of the baffle 18 rotates around the insertion rod 20, and the torsion spring 21 twists. When the impact of the cleaning sand on the baffle 18 ends, the torsion spring 21 twists back to its original position, and the sleeve 19 of the baffle 18 rotates in the opposite direction around the insertion rod 20. Therefore, when the device is not working, the phenomenon of residual cleaning sand in the feed pipe 2 entering the outer casing 1 will not occur.

[0025] Example 6: Reference Figures 1-11It also includes a cleaning component, which includes a cleaning pipe 22, an annular pipe 23, and a cleaning input pipe 24. One end of the cleaning pipe 22 is connected to the side wall of the annular pipe 23, which surrounds the outer casing 1. The bottom inner wall of the annular pipe 23 is connected to the ends of multiple cleaning input pipes 24. The other end of each cleaning input pipe 24 is connected to the bottom wall of the outer casing 1 and faces the moving plate 3. A one-way valve is connected inside the cleaning pipe 22, and a second one-way valve is connected inside the cleaning input pipe 24. After the backfilling is completed, residual cleaning sand will appear inside the outer casing 1 and needs to be cleaned. This is done through cleaning... Cleaning water is input through pipe 22 and enters the cleaning input pipe 24 through the annular pipe 23. The cleaning water then exits through the cleaning input pipe 24 to the interior of the outer casing 1, cleaning the interior of the outer casing 1 from bottom to top. After cleaning, the water carrying residual cleaning sand is discharged outside the device through the insertion pipe 6, thus preventing the residual cleaning sand from caking inside the outer casing 1. This also prevents the moving plate 3 from being fixed or jammed by the caking cleaning sand, preventing the moving plate 3 from failing to move or moving slowly during the second output of cleaning sand, thus avoiding the failure of the buffer against the cleaning sand. The presence of high jet flow can cause oil phase to enter the water. Residual cleaning sand can prevent some of the cleaning sand from clogging the rectangular array of insertion pipes 6, thus avoiding any impact on the uniformity of the back-laying process. Considering the complexity of actual work and the possibility of accidents, specifically, after back-laying, if debris in the device or water impacts the back-laying surface, some oil phase may escape into the water. If this oil phase enters the interior of the outer casing 1 through the device's piping structure, it will adhere to the interior of the outer casing 1. In this case, it can be addressed by introducing cleaning through the cleaning pipe 22. Cleaning water containing environmentally friendly surfactants cleans the inside of the outer casing 1, thereby improving the cleanliness of the device. This also prevents the aggravation of caking caused by the mixing of oil phase and residual cleaning sand, and avoids secondary pollution caused by the discharge of oil phase during the second operation. Cleaning the oil phase can prevent corrosion and damage to the inside of the device. Since a one-way valve is connected in the cleaning pipe 22 and a second one-way valve is connected in the cleaning input pipe 24, no water or cleaning sand will enter the cleaning pipe 22 and the cleaning input pipe 24 when cleaning is not performed or when the device is in operation.

[0026] Example 7: Reference Figures 1-11 The other side wall of the annular tube 23 is connected to the end of the control tube 25. The other end of the control tube 25, which is placed inside the outer casing 1, is connected to the top side wall of the horizontal tube 26. The horizontal tube 26 is fixed inside the outer casing 1. Two pistons 27 are slidably and sealed inside the horizontal tube 26. The other end of the control tube 25 is set towards the side wall of the piston 27. The end of the spring 28 and the end of the L-shaped push rod 29 are connected to the side wall of the piston 27 away from the other end of the control tube 25. The L-shaped push rod 29 is slidably and sealed to the horizontal tube 26.

[0027] The bottom of the vertical part of the L-shaped push rod 29, which is placed outside the horizontal tube 26, is connected to a slider 30. The slider 30 slides in the groove 31, which is opened on the drive plate 32. One end of the drive plate 32 is rotatably connected to the inner wall of the outer shell 1.

[0028] The other end of the drive plate 32 is disposed toward the side wall of the moving plate 3 away from the feed pipe 2, and the other ends of the two drive plates 32 are disposed facing each other.

[0029] During the cleaning process, some water enters the control pipe 25 through the annular pipe 23, and then enters the horizontal pipe 26. The two pistons 27 inside the horizontal pipe 26 move in opposite directions due to the pressure from the water. Simultaneously, the second spring 28 is compressed, and the L-shaped push rod 29 moves synchronously. The slider 30 at the bottom of the L-shaped push rod 29 slides within the groove 31. Since one end of the drive plate 32 is rotatably connected to the inner wall of the outer casing 1, and the other ends of the two drive plates 32 face each other, as the slider 30 slides within the groove 31, the two drive plates 32 begin to rotate. After the other end of the drive plate 32 contacts the side wall of the moving plate 3 located within the working chamber, it drives the moving plate 3 towards the feed pipe 2. At this time, the buffer... The spring 11 in structure 8 is stretched, and the moving plate 3 scrapes the inner wall of the outer shell 1. Combined with the continuous output of cleaning water, the cleaning effect on residual cleaning sand is improved. After the two pistons 27 move into place, the pistons 27 remain stationary under the action of water pressure. Therefore, the drive plate 32 can remain stationary in the device, and finally fix the position of the moving plate 3. At this time, the moving plate 3 is close to the output end of the cleaning input pipe 24, so that the moving plate 3 can be effectively cleaned. Simultaneously, due to the moving plate 3 approaching the cleaning input pipe 24, the water pressure input into the insertion pipe 6 is increased synchronously, which can further avoid the residue of cleaning sand in any insertion pipe 6 and prevent the device from having uneven back-spreading phenomenon during the second operation. During the cleaning process, because the device is equipped with a baffle 18 and the baffle 18 seals the output end of the feed pipe 2, no cleaning water, residual cleaning sand or other debris will enter the feed pipe 2 during the cleaning process. After the device finishes cleaning, the cleaning pipe 22 stops supplying cleaning water. The cleaning water between the two pistons 27 will be discharged through the control pipe 25 under the elastic force of the spring 28. The one-way valve of the cleaning pipe 22 is closed, and no residual cleaning water will be discharged. Therefore, the cleaning water in the control pipe 25 will enter the annular pipe 23. If the volume of residual cleaning water is too large, it will enter the cleaning input pipe 24 or the outer casing 1 through the one-way valve of the annular pipe 23. The reset piston 27 drives the L-shaped push rod 29 to reset. The slider 20 slides in the opposite direction in the slide groove 31. At the same time, the ends of the two sliders 20 stop contacting the moving plate 3. Under the reset action of the spring 11 in the buffer mechanism 8, the moving plate 3 resets, and finally the two drive plates 32 reset. Furthermore, the drive plate 32 can buffer the moving plate 3 after it is subjected to a violent impact. That is, when the output pressure of the cleaning sand from the feed pipe 2 suddenly increases, the moving plate 3 will contact the other end of the drive plate 32. The spring 28 provides some buffering to prevent the moving plate 3 from being damaged after hitting the internal mechanism of the outer shell 1 and failing to reset. The annular tube 23 surrounding the housing 1 can protect the side wall of the housing 1 and prevent damage to the device due to impact during operation.

[0030] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A low-disturbance backfilling rake head for dredging bituminous sand, characterized in that, include: The outer shell (1), feed pipe (2), moving plate (3), guide pipe (4), tapered pipe (5), insertion tube (6) and waist-shaped hole (7) are connected to the end of the feed pipe (2) on the outer shell (1). The moving plate (3) is slidably and sealed inside the outer shell (1). Multiple insertion tubes (6) are connected to the ends of the tubes (6) in a rectangular array on the moving plate (3) and are set towards the feed pipe (2). The other end of the insertion tube (6) is slidably and sealed inside the guide pipe (4). Multiple waist-shaped holes (7) are opened through the side wall of the end of the insertion tube (6). One end of the waist-shaped hole (7) is placed inside the tapered pipe (5). The end of the guide pipe (4) is connected to the end of the tapered pipe (5). The other end of the tapered pipe (5) is connected to the outer shell (1). A buffer mechanism (8) is provided between the outer shell (1) and the moving plate (3).

2. The low-disturbance reverse-laying isolation layer rake head for dredging asphalt-containing sand according to claim 1, characterized in that, The diameter of the end of the tapered tube (5) furthest from the feed tube (2) is greater than the diameter of its other end.

3. A low-disturbance backfilling rake head for dredging asphalt-containing sand according to claim 1, characterized in that, The buffer mechanism (8) includes: tube (9), tube two (10) and spring (11). The side wall of the moving plate (3) away from the feed pipe (2) and the outer shell (1) form a working cavity. The side wall of the moving plate (3) is connected to the ends of multiple tubes (9). The other end of each tube (9) is slidably connected to the end of tube two (10). The other end of tube two (10) is connected to the outer shell (1). Tube (9) and tube two (10) are placed in the working cavity. The two ends of the spring (11) are respectively connected to the inner wall of the end of tube (9) and the inner wall of the other end of tube two (10).

4. A low-disturbance reverse-laying isolation layer rake head for dredging asphalt-containing sand according to claim 3, characterized in that, The side wall of the movable plate (3) is connected to the end of the push rod (12), the push rod (12) is slidably sealed to the outer shell (1), the other end of the push rod (12) is hinged to the slider (13), the slider (13) is longitudinally slidably connected in the slide rail (14), the slide rail (14) is connected to the end face of the buffer baffle (15), the end face of the buffer baffle (15) is set towards the tapered tube (5), the top of the buffer baffle (15) is hinged to the outer shell (1), and the bottom of the buffer baffle (15) is set away from the outer shell (1).

5. A low-disturbance backfilling rake head for dredging asphalt-containing sand according to claim 4, characterized in that, The slider (13) has a through hole (16) extending longitudinally through it, and the inner walls of the top and bottom ends of the through hole (16) are chamfered (17).

6. A low-disturbance backfilling rake head for dredging asphalt-containing sand according to claim 3, characterized in that, The outer casing (1) is provided with two baffles (18) to seal the end of the feed pipe (2). The side of the baffle (18) is connected to a sleeve (19). The sleeve (19) is rotatably connected to the insert rod (20). The insert rod (20) is connected inside the outer casing (1). A torsion spring (21) is connected between the sleeve (19) and the outer casing (1). The ends of the two baffles (18) away from the sleeve (19) contact each other and seal.

7. A low-disturbance backfilling rake head for dredging asphalt-containing sand according to claim 1, characterized in that, It also includes a cleaning component, which includes a cleaning pipe (22), an annular pipe (23) and a cleaning input pipe (24). The end of the cleaning pipe (22) is connected to the side wall of the annular pipe (23). The annular pipe (23) is arranged around the outer shell (1). The bottom inner wall of the annular pipe (23) is connected to the ends of multiple cleaning input pipes (24). The other end of the cleaning input pipe (24) is connected to the bottom wall of the outer shell (1) and is arranged towards the moving plate (3). A one-way valve is connected inside the cleaning pipe (22), and a second one-way valve is connected inside the cleaning input pipe (24).

8. A low-disturbance backfilling rake head for dredging asphalt-containing sand according to claim 7, characterized in that, The other side wall of the annular tube (23) is connected to the end of the control tube (25). The other end of the control tube (25) is placed inside the outer shell (1) and connected to the top side wall of the horizontal tube (26). The horizontal tube (26) is fixed inside the outer shell (1). Two pistons (27) are slidably and sealed inside the horizontal tube (26). The other end of the control tube (25) is set towards the side wall of the piston (27). The end of the second spring (28) is connected to the side wall of the piston (27) away from the other end of the control tube (25), and the end of the L-shaped push rod (29). The L-shaped push rod (29) is slidably and sealed to the horizontal tube (26).

9. A low-disturbance backfilling rake head for dredging asphalt-containing sand according to claim 8, characterized in that, The bottom of the vertical part of the L-shaped push rod (29) outside the horizontal tube (26) is connected to a slider two (30). The slider two (30) slides in the slide groove (31). The slide groove (31) is opened on the drive plate (32). One end of the drive plate (32) is rotatably connected to the inner wall of the outer shell (1).

10. A low-disturbance backfilling rake head for dredging bituminous sand as described in claim 9, characterized in that, The other end of the drive plate (32) is disposed toward the side wall of the moving plate (3) away from the feed pipe (2), and the other ends of the two drive plates (32) are disposed facing each other.

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