Sand suction device for a sand dredger

Abstract

The present application relates to a kind of suction sand device of sand dredger, and it relates to sand dredger technical field.The suction sand device includes ship body, the stern position of ship body is movably connected with suction sand pipe and sand flushing pipe respectively, the lower end of suction sand pipe is provided with suction sand head;It also includes mounting plate, mounting plate is fixed outside suction sand head, bolt mounting plate lower surface and located outside the suction sand head is provided with anti-winding cover, one side of mounting plate lower surface is fixed with motor, the output end of motor is fixed with driving gear through shaft, the inside of mounting plate and located outside anti-winding cover is provided with driven gear ring, the lower surface of driven gear ring is connected with four scrapers about the center point of anti-winding cover Equiangularly, the inside and below of mounting plate are provided with swing type impurity removal assembly, the inside of suction sand pipe, mounting plate and anti-winding cover is provided with swing type dredging assembly.The present application blocks stone, sundries into suction sand mouth by anti-winding cover;By motor drive multiple scrapers rotation along the outer wall of anti-winding cover, and timely scrape surface winding impurities.

Description

Technical Field

[0001] This invention relates to the field of sand dredger technology, specifically to a sand suction device for sand dredgers. Background Technology

[0002] Sand is a crucial raw material for infrastructure construction, river dredging, and land reclamation projects. Sand dredgers are the core equipment for underwater sand mining, and the suction device, as a key component of the dredger, directly determines the dredging efficiency, applicable working conditions, and equipment reliability. Currently, most mainstream sand dredgers employ suction devices of the jet suction, cutter suction, or vacuum suction types, mainly composed of a suction pump, suction pipes, suction heads, flushing nozzles, and lifting and adjusting mechanisms. During operation, the onboard pump unit provides negative pressure or high-pressure jets, and the high-pressure water flow disperses the underwater sand layer, causing the sand and water to form a slurry. The suction pump then pumps the slurry through the suction pipes and transports it to the sand tank or a designated discharge location. However, existing suction devices have the following drawbacks in practical use: When sand suction devices are used for underwater sand mining operations, the suction port is easily blocked by aquatic plants, debris, silt, and rocks, resulting in poor sand slurry suction, a significant decrease in sand mining efficiency, and in severe cases, even equipment shutdown, affecting the continuity of operations. Even if some devices are equipped with anti-winding covers, they lack an automatic cleaning structure for the surface of the anti-winding covers. Aquatic plants and debris easily adhere to and become entangled on the outer wall of the anti-winding covers, which can cause blockage of the sand inlet channel with long-term use. This requires frequent manual underwater cleaning, which is cumbersome, labor-intensive, and poses high safety risks. When the sand suction head is submerged in deep water, the water pressure increases, the sand layer becomes denser, and the adhesion of debris becomes stronger, while the cleaning force remains unchanged. This can easily lead to incomplete cleaning or cleaning failure, resulting in poor adaptability. Furthermore, once internal blockage occurs, it cannot be cleared in a timely and automatic manner, requiring shutdown and disassembly for maintenance. This is not only time-consuming and labor-intensive, but also significantly reduces the efficiency of sand mining operations and increases the cost of equipment use. Summary of the Invention

[0003] The purpose of this invention is to provide a sand suction device for sand dredgers, thereby solving the problems mentioned in the background section. To achieve the above objective, this invention provides the following technical solution: A sand suction device for a sand dredger includes a hull, on the upper surface of which a sand suction pump and a high-pressure water pump are respectively installed, and a sand suction pipe and a sand flushing pipe are movably connected to the stern of the hull, with a sand suction head provided at the lower end of the sand suction pipe. It also includes a mounting plate, which is fixedly installed on the outside of the suction head. An anti-winding cover is bolted to the lower surface of the mounting plate and located on the outside of the suction head. A motor is fixedly connected to one side of the lower surface of the mounting plate. The output end of the motor is fixedly connected to a drive gear through a shaft. A driven gear ring is sleeved inside the mounting plate and located on the outside of the anti-winding cover. Four scrapers are connected at equal angles to the lower surface of the driven gear ring about the center point of the anti-winding cover. A swing-type cleaning component is provided inside and below the mounting plate. A swing-type unblocking component is provided inside the suction pipe, the mounting plate, and the anti-winding cover.

[0004] Preferably, the upper end of the sand flushing pipe is sealed to the outlet end of the high-pressure water pump via a flange, the upper end of the sand suction pipe is sealed to the suction end of the sand suction pump via a flange, the top of the scraper is rotatably connected to the lower surface of the driven toothed ring via a shaft, and a first torsion spring is installed at the connection position between the shaft end of the scraper and the driven toothed ring.

[0005] Preferably, the driving gear bearing is connected inside the mounting plate, the driving gear and the driven gear ring are meshed, and the driven gear ring is rotatably connected inside the mounting plate.

[0006] Preferably, the oscillating cleaning assembly includes four fixed cylinders, which are fixed at equal angles to the center point of the anti-winding cover on the lower surface of the mounting plate. A piston plate is connected inside the fixed cylinder, and a first spring is installed between the upper surface of the piston plate and the inner wall of the fixed cylinder. A limit rod is fixedly connected inside the mounting plate and above the fixed cylinder. An adjusting block is slidably connected to the outer side of the limit rod. A water inlet hole is opened at the bottom of the fixed cylinder, and a driven cam is sleeved and fixed on the outer side of the scraper shaft end.

[0007] Preferably, the piston plate is slidably connected inside the fixed cylinder, and the top of the piston plate is fixedly connected to the bottom of the adjusting block by a connecting rod.

[0008] Preferably, the adjusting block is arranged in the shape of a frustum, which is narrower at the top and wider at the bottom. The position of the adjusting block corresponds to that of the driven cam, and the adjusting block is in contact with the outer side of the driven cam.

[0009] Preferably, the swing-type unblocking assembly includes a transmission rod, which is bearing-connected to the upper part of the anti-winding cover. One end of the transmission rod is connected to the shaft end of the drive gear through a bevel gear set. An drive cam is fixedly sleeved on the outer side of the transmission rod. An unblocking rod is provided at the lower end of the sand suction pipe. A wedge block is fixed to the right side of the lower end of the unblocking rod. An adhesive block is fixedly connected to the right side of the lower end of the inner wall of the sand suction pipe.

[0010] Preferably, one end of the transmission rod extends into the interior of the mounting plate, the outer side of the active cam is in contact with the bottom end of the unblocking rod, and the positions of the contact block and the wedge block correspond one-to-one.

[0011] Preferably, the unclogging rod is slidably disposed inside the sand suction pipe via two sliders, and the outer side of the unclogging rod is rotatably connected to the opposite surface of the two sliders via a shaft, and a second torsion spring is installed at the connection position between the shaft end of the unclogging rod and the slider, and a second spring is installed between the top of the slider and the inner wall of the sand suction pipe.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention provides an anti-winding cover on the outside of the sand suction head to prevent stones and debris from entering the sand suction port and thus prevent blockage. The motor, drive gear and driven gear ring drive multiple scrapers to rotate circumferentially along the outer wall of the anti-winding cover to remove surface entangled impurities in a timely manner, ensuring smooth flow of sand into the sand suction head and improving the stability and continuity of sand mining operations.

[0013] 2. In this invention, when the scraper rotates with the driven toothed ring, the driven cam is deflected by the pressure of the adjusting block. After passing the adjusting block, it is reset under the action of the first torsion spring, so that the scraper swings back and forth while rotating in the circumferential direction, thereby improving the cleaning effect and coverage of impurities.

[0014] 3. In this invention, when the sand suction head sinks, the piston plate inside the fixed cylinder moves upward under the pressure of water and the formation, which drives the adjusting block to rise, so that the swing angle of the scraper increases adaptively with the depth; when rising, the piston plate is reset under the action of the first spring, so that the cleaning force and amplitude are automatically adjusted with the working depth.

[0015] 4. In this invention, the motor reciprocates by pressing the unblocking rod through the bevel gear set, transmission rod and active cam, causing it to move up and down; the unblocking rod is deflected by the wedge block and the contact block, and returns to its original position under the action of the second spring and the second torsion spring when it is reset, realizing the combination of up and down movement and left and right swing, which enhances the unblocking effect of the sand suction port and avoids blockage. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a side sectional view of the mounting plate in this invention; Figure 3 This is a schematic diagram of the connection structure of the scraper in this invention; Figure 4 This is a schematic diagram of the meshing structure between the driving gear and the driven gear ring in this invention; Figure 5 This is a side sectional view of the anti-winding cover in this invention; Figure 6 This is a schematic diagram of the upward movement of the unblocking rod in this invention; Figure 7 This is a schematic diagram of the main cross-sectional structure of the fixed cylinder in this invention; Figure 8 This is a schematic diagram of the connection structure between the driven gear ring and the driven cam in this invention; Figure 9 For the present invention Figure 3 Enlarged structural diagram at point A; Figure 10 For the present invention Figure 5 A magnified structural diagram at point B in the middle.

[0017] In the diagram: 1. Hull; 2. Sand suction pump; 3. High-pressure water pump; 4. Sand suction pipe; 5. Sand flushing pipe; 6. Mounting plate; 7. Anti-winding cover; 8. Sand suction head; 9. Driven gear ring; 10. Scraper; 1101. Fixed cylinder; 1102. Piston plate; 1103. Connecting rod; 1104. First spring; 1105. Adjusting block; 1106. Limiting rod; 1107. Driven cam; 1108. Water inlet; 1201. Bevel gear set; 1202. Transmission rod; 1203. Driving cam; 1204. Unblocking rod; 1205. Slider; 1206. Second spring; 1207. Wedge block; 1208. Adhesive block; 13. Driving gear. Detailed Implementation

[0018] To further illustrate the technical means and effects adopted by the present invention in order to achieve the intended purpose, the following detailed description is provided in conjunction with the accompanying drawings and preferred embodiments, based on the specific implementation methods, structures, features and effects of the present invention.

[0019] Please see Figures 1-10 This invention provides a sand suction device for a sand dredger, comprising a hull 1, with a sand suction pump 2 and a high-pressure water pump 3 respectively installed on the upper surface of the hull 1. A sand suction pipe 4 and a sand flushing pipe 5 are movably connected to the stern of the hull 1, and a sand suction head 8 is provided at the lower end of the sand suction pipe 4. It also includes a mounting plate 6, which is fixedly installed on the outside of the sand suction head 8. An anti-winding cover 7 is bolted to the lower surface of the mounting plate 6, located on the outside of the sand suction head 8. A motor is fixedly connected to one side of the lower surface of the mounting plate 6, and the output end of the motor is fixedly connected to a drive gear 13 via a shaft. The anti-winding cover 7 is located inside the mounting plate 6, outside the mounting plate 6. A driven gear ring 9 is fitted, and four scrapers 10 are connected at equal angles to the center point of the anti-winding cover 7 on the lower surface of the driven gear ring 9. The upper end of the sand flushing pipe 5 is sealed to the outlet end of the high-pressure water pump 3 through a flange, and the upper end of the sand suction pipe 4 is sealed to the suction end of the sand suction pump 2 through a flange. The top of the scraper 10 is rotatably connected to the lower surface of the driven gear ring 9 through a shaft, and a first torsion spring is installed at the connection position between the shaft end of the scraper 10 and the driven gear ring 9. The drive gear 13 is bearing connected inside the mounting plate 6, and the drive gear 13 and the driven gear ring 9 are meshed. The driven gear ring 9 is rotatably connected inside the mounting plate 6.

[0020] In one embodiment of the present invention, after the vessel 1 travels to the designated sand mining area in the Yellow River, the sand suction pipe 4, sand suction head 8, and sand flushing pipe 5 are lowered into the Yellow River using a winch deployment device. The sand suction pump 2 is then activated to generate negative pressure at its suction end, creating suction power. After the sand suction head 8 penetrates deep into the sand layer of the Yellow River bed, the sand-water mixture (containing Yellow River silt, a small amount of fine sand, and light impurities) in the Yellow River channel enters the sand suction pipe 4 through the sand suction head 8 under negative pressure. The sand suction pump 2 then pressurizes and transports the mixture to the designated screening and storage device on the vessel. The sand is transported to the target location to complete the sand dredging and suction operation in the Yellow River. By installing an anti-winding cover 7 on the outside of the suction head 8, stones and debris can be effectively blocked from entering the suction port, preventing impurities such as weeds and silt from clogging the suction head 8, thus improving the operational stability and continuity of the suction device. At the same time, the flushing pipe 5 is lowered into the Yellow River water along with the suction pipe 4, with the lower end of the flushing pipe 5 facing the sand layer of the Yellow River bed around the suction head 8. After the high-pressure water pump 3 is started, high-pressure water is delivered to the flushing pipe 5 and sprayed out through the nozzle at the end of the flushing pipe 5. High-pressure water flow acts on the compacted sand layer of the Yellow River bed and the sand body around the sand suction head 8. On the one hand, it can disperse and loosen the compacted Yellow River silt, making it easier for the sand suction head 8 to quickly suck up the sand-water mixture, thus solving the problem of easy compaction of the Yellow River sand layer and difficulty in sand suction. On the other hand, it can flush away the accumulated impurities around the sand suction head 8 and the anti-winding cover 7, assisting the scraper 10 in preventing blockage, further improving the operating efficiency of the sand suction device in the Yellow River sand mining scenario, while reducing the negative pressure load of the sand suction pump 2 and avoiding blockage of the sand suction pipe 4 due to excessively dense sand layer. Then, the motor drives the drive gear 13 to rotate, which in turn drives the driven gear ring 9 to rotate synchronously. The driven gear ring 9 further drives the multiple scrapers 10 set at the bottom to rotate circumferentially along the outer wall of the anti-winding cover 7. Through the continuous scraping action of the scrapers 10, the impurities attached to and wrapped around the surface of the anti-winding cover 7 are removed in time, preventing the anti-winding cover 7 from being blocked due to the accumulation of impurities. This ensures that the sand suction head 8 always maintains a good flow state and anti-blocking effect, and ensures that the Yellow River sand mining operation is carried out efficiently and stably.

[0021] An oscillating cleaning assembly is provided inside and below the mounting plate 6. The oscillating cleaning assembly includes four fixed cylinders 1101, which are fixed at equal angles to the center point of the anti-winding cover 7 on the lower surface of the mounting plate 6. A piston plate 1102 is connected inside each fixed cylinder 1101. A first spring 1104 is installed between the upper surface of the piston plate 1102 and the inner wall of the fixed cylinder 1101. A limit rod 1106 is fixedly connected inside the mounting plate 6 and above the fixed cylinders 1101. An adjustment mechanism is slidably connected to the outer side of the limit rod 1106. The segment 1105 and piston plate 1102 are slidably connected inside the fixed cylinder 1101. The top of the piston plate 1102 and the bottom of the adjusting block 1105 are fixedly connected by a connecting rod 1103. The bottom of the fixed cylinder 1101 is provided with a water inlet hole 1108. A driven cam 1107 is sleeved and fixed on the outer side of the scraper 10 shaft end. The adjusting block 1105 is set in the shape of a frustum with a narrow top and a wide bottom. The position of the adjusting block 1105 corresponds to that of the driven cam 1107, and the outer side of the adjusting block 1105 is in contact with the outer side of the driven cam 1107.

[0022] In one embodiment of the present invention, when the scraper 10 rotates with the driven gear ring 9 to the position of the adjusting block 1105, the driven cam 1107 is deflected by the squeezing action of the adjusting block 1105, thereby driving the scraper 10 to swing synchronously; after the driven cam 1107 rotates past the adjusting block 1105 with the driven gear ring 9, the scraper 10 rotates back to its original position under the elastic reset action of the first torsion spring; through the above structural cooperation, the scraper 10 can also reciprocate while rotating around the anti-winding cover 7, thereby improving the cleaning effect and cleaning range of impurities on the surface of the anti-winding cover 7; when the suction head 8 descends synchronously with the sand surface depth, the water received by the lower part of the fixed cylinder 1101 As the pressure from the ground increases, the piston plate 1102 moves upward. The piston plate 1102 drives the adjusting block 1105 to move upward synchronously through the connecting rod 1103. Utilizing the structural characteristics of the adjusting block 1105, which is narrow at the top and wide at the bottom, the contact height between the driven cam 1107 and the adjusting block 1105 gradually increases. This causes the deflection angle of the driven cam 1107 and the scraper 10 to increase adaptively with the increase of the sinking depth, thereby realizing the automatic adjustment of the cleaning force and the swing amplitude with the working depth. When the sand suction head 8 rises, the water pressure on the lower part of the fixed cylinder 1101 gradually decreases. At this time, the piston plate 1102 resets under the elastic force of the first spring 1104, and drives the adjusting block 1105 to reset as well.

[0023] The suction pipe 4, mounting plate 6, and anti-winding cover 7 are equipped with an oscillating unblocking assembly. The oscillating unblocking assembly includes a transmission rod 1202, which is bearing-connected to the upper part of the anti-winding cover 7. One end of the transmission rod 1202 is connected to the shaft end of the drive gear 13 via a bevel gear set 1201. An drive cam 1203 is fixedly fitted onto the outer side of the transmission rod 1202. A unblocking rod 1204 is located at the lower end of the suction pipe 4. A wedge block 1207 is fixed to the right side of the lower end of the unblocking rod 1204. A bonding block 120 is fixedly connected to the right side of the lower end of the inner wall of the suction pipe 4. 8. One end of the transmission rod 1202 extends into the interior of the mounting plate 6. The outer side of the active cam 1203 is in contact with the bottom end of the unclogging rod 1204. The positions of the contact block 1208 and the wedge block 1207 correspond one-to-one. The unclogging rod 1204 is slidably disposed inside the sand suction pipe 4 through two sliders 1205. The outer side of the unclogging rod 1204 and the opposite surfaces of the two sliders 1205 are rotatably connected by a shaft. A second torsion spring is installed at the connection position between the shaft end of the unclogging rod 1204 and the slider 1205. A second spring 1206 is installed between the top of the slider 1205 and the inner wall of the sand suction pipe 4.

[0024] In one embodiment of the present invention, when the motor drives the drive gear 13 to rotate, the drive gear 13 drives the transmission rod 1202 to rotate synchronously through the bevel gear set 1201. The transmission rod 1202 drives the drive cam 1203 to rotate continuously and reciprocate to squeeze the unclogging rod 1204, causing the unclogging rod 1204 to move upward, thereby achieving real-time unclogging of the sand suction port. During the upward movement of the unclogging rod 1204, the wedge block 1207 is squeezed by the contact block 1208, causing the unclogging rod 1204 to deflect. When the drive cam 1203 stops squeezing the unclogging rod 1204, the unclogging rod 1204 returns to its original position downward under the elastic force of the second spring 1206, and rotates back to its original position under the elastic storage force of the second torsion spring. Repeating the above movement process allows the unclogging rod 1204 to swing left and right while moving up and down reciprocally, thereby greatly improving the unclogging effect of the sand suction port and effectively preventing the sand suction port from becoming blocked.

[0025] Working principle: When using the sand suction device on this sand dredging vessel, the hull 1 first travels to the designated sand dredging area of ​​the Yellow River. Then, the sand suction pipe 4, sand suction head 8, and sand flushing pipe 5 are lowered into the water via a winch. The sand suction pump 2 is then activated to generate negative pressure. After the sand suction head 8 penetrates the sand layer, the sand-water mixture, under negative pressure, flows through the sand suction head 8 and sand suction pipe 4 into the sand suction pump 2. The pump then pressurizes and transports the mixture to the target location to complete the sand suction. The anti-winding cover 7 installed on the outside of the sand suction head 8 can block debris. The motor drives the drive gear 13 to rotate the driven gear ring 9, causing the scraper 10 to scrape along the circumference of the anti-winding cover 7. The process removes surface impurities, prevents blockage of the cover, and ensures smooth sand suction flow. When the scraper 10 rotates to the adjusting block 1105, the driven cam 1107 is squeezed, causing the scraper 10 to swing. After rotating past the adjusting block 1105, the scraper 10 is reset by the first torsion spring, achieving circumferential rotation and reciprocating swing, improving the cleaning effect and range. When the sand suction head 8 sinks, the water pressure pushes the adjusting block 1105 upward, and the deflection angle of the scraper 10 increases adaptively with the depth. When the sand suction head 8 moves upward, the adjusting block 1105 is reset, and at the same time, the motor-driven unblocking rod 1204 performs up-and-down swinging motion to unblock the sand suction port in real time and prevent blockage.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A sand suction device for a sand dredger, comprising a hull (1), wherein a sand suction pump (2) and a high-pressure water pump (3) are respectively installed on the upper surface of the hull (1), and a sand suction pipe (4) and a sand flushing pipe (5) are respectively movably connected to the stern of the hull (1), and a sand suction head (8) is provided at the lower end of the sand suction pipe (4). Its features are: It also includes an installation plate (6), which is fixedly installed on the outside of the suction head (8). An anti-winding cover (7) is bolted on the lower surface of the installation plate (6) and located on the outside of the suction head (8). A motor is fixedly connected to one side of the lower surface of the installation plate (6). The output end of the motor is fixedly connected to a drive gear (13) through a shaft. A driven gear ring (9) is sleeved inside the installation plate (6) and located on the outside of the anti-winding cover (7). Four scrapers (10) are connected at equal angles to the lower surface of the driven gear ring (9) about the center point of the anti-winding cover (7). A swing-type cleaning component is provided inside and below the installation plate (6). A swing-type unblocking component is provided inside the suction pipe (4), the installation plate (6) and the anti-winding cover (7).

2. The sand suction device for a sand dredger according to claim 1, characterized in that: The upper end of the sand flushing pipe (5) is sealed to the outlet of the high-pressure water pump (3) through a flange, the upper end of the sand suction pipe (4) is sealed to the suction end of the sand suction pump (2) through a flange, the top of the scraper (10) is rotatably connected to the lower surface of the driven toothed ring (9) through a shaft, and a first torsion spring is installed at the connection position between the shaft end of the scraper (10) and the driven toothed ring (9).

3. The sand suction device for a sand dredger according to claim 1, characterized in that: The drive gear (13) is connected to the inside of the mounting plate (6) by a bearing. The drive gear (13) and the driven gear ring (9) are meshed. The driven gear ring (9) is rotatably connected to the inside of the mounting plate (6).

4. A sand suction device for a sand dredger according to claim 1, characterized in that: The swing-type cleaning assembly includes four fixed cylinders (1101). The four fixed cylinders (1101) are fixed at equal angles to the center point of the anti-winding cover (7) on the lower surface of the mounting plate (6). A piston plate (1102) is connected inside the fixed cylinder (1101). A first spring (1104) is installed between the upper surface of the piston plate (1102) and the inner wall of the fixed cylinder (1101). A limit rod (1106) is fixedly connected inside the mounting plate (6) and above the fixed cylinder (1101). An adjusting block (1105) is slidably connected to the outside of the limit rod (1106). A water inlet hole (1108) is opened at the bottom of the fixed cylinder (1101). A driven cam (1107) is sleeved and fixed on the outer side of the scraper (10) shaft end.

5. A sand suction device for a sand dredger according to claim 4, characterized in that: The piston plate (1102) is slidably connected inside the fixed cylinder (1101), and the top of the piston plate (1102) is fixedly connected to the bottom of the adjusting block (1105) by a connecting rod (1103).

6. A sand suction device for a sand dredger according to claim 4, characterized in that: The adjusting block (1105) is arranged in the shape of a frustum with a narrow top and a wide bottom. The adjusting block (1105) is positioned corresponding to the driven cam (1107), and the adjusting block (1105) is in contact with the outer side of the driven cam (1107).

7. A sand suction device for a sand dredger according to claim 1, characterized in that: The swing-type unblocking assembly includes a transmission rod (1202), which is connected to the upper part of the anti-winding cover (7) by a bearing. One end of the transmission rod (1202) is connected to the shaft end of the drive gear (13) through a bevel gear set (1201). An drive cam (1203) is fixedly sleeved on the outside of the transmission rod (1202). A unblocking rod (1204) is provided at the lower end of the sand suction pipe (4). A wedge block (1207) is fixed on the right side of the lower end of the unblocking rod (1204). A bonding block (1208) is fixedly connected to the right side of the lower end of the inner wall of the sand suction pipe (4).

8. A sand suction device for a sand dredger according to claim 7, characterized in that: One end of the transmission rod (1202) extends into the interior of the mounting plate (6), the outer side of the active cam (1203) is in contact with the bottom end of the unblocking rod (1204), and the positions of the contact block (1208) and the wedge block (1207) correspond one-to-one.

9. A sand suction device for a sand dredger according to claim 7, characterized in that: The unclogging rod (1204) is slidably disposed inside the sand suction pipe (4) via two sliders (1205), and the outer side of the unclogging rod (1204) is rotatably connected to the opposite surface of the two sliders (1205) via a shaft. A second torsion spring is installed at the connection position between the shaft end of the unclogging rod (1204) and the slider (1205), and a second spring (1206) is installed between the top of the slider (1205) and the inner wall of the sand suction pipe (4).

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