Oscillating cutting column collection device for wetland or grass lake sediments

Abstract

The present invention discloses an oscillating cutting columnar collection device suitable for wetland or grass-type lake sediments. This device cooperates with two sets of screw sliders to enable the suction cup to move synchronously and adsorb on the hollow sampler when it moves downward, so that negative pressure is formed in the hollow sampler to prevent sediment from falling, and the stability of the hollow sampler is improved. When the device is extended into the lake, the drive motor switch is turned on, and the driving gear drives the gear ring to rotate the cutting disc and the cutting knife to cut the aquatic plants and eliminate their influence on the sampling work. When the hollow sampler contacts the bottom surface of the lake with the mud guard bottom plate, the pulse oscillator vibrates the device, and under the action of the device's own gravity, the hollow sampler moves downward, and its interior will be filled with sampled sediment.

Description

Technical Field

[0001] The invention relates to the technical field of silt sediment collection, in particular to an oscillating cutting columnar collection device suitable for wetland or grass-type lake sediments. Background Art

[0002] The study of wetland and grass-type lake sediments is of great significance in the field of ecological environment. Through the information such as pollen, fossils, and chemical elements contained in each layer of sediments, it can trace the changes in climate, hydrology, and human activities over thousands of years, providing a historical reference for ecological restoration. From the perspective of biogeochemical cycles, sediments are the core hub for the storage and release of elements such as carbon, nitrogen, and phosphorus. They not only serve as an important global carbon reservoir, but also regulate the concentration of nutrients in water bodies through processes such as adsorption, desorption, and microbial decomposition. They are also the "source" and "sink" of heavy metals and pollutants, affecting the migration and transformation of pollutants. In terms of ecological service functions and environmental risk assessment, sediment research can clarify the wetland water purification mechanism, optimize wetland design, identify ecological risks through sediment quality benchmarks, assess greenhouse gas emissions, and ensure ecological security.

[0003] However, the foundation of current sediment research—sampling—faces severe challenges. Existing techniques for collecting sediment from wetlands and grass-covered lakes use simple tubular samplers. These samplers are small, portable, and easy to operate, but they also have some significant drawbacks. The hollow sampler requires a counterweight to be inserted into the lakebed soil. This method, however, is subject to buoyancy during the collection process, resulting in poor percussion. Furthermore, when the sampler is struck, sediment samples can easily fall out of the hollow sampler due to the impact of the strike or the device's own gravity, resulting in a loss of sample integrity and a risk of the device falling to the lakebed.

[0004] In wetlands and grassy lakes, especially in waters with lush seaweed, plant roots and stems and leaves seriously hinder the collector from penetrating into the sediment layer, significantly reducing the sampling efficiency and quality. However, cutting or pushing them away with plant roots can greatly improve the sampling efficiency and quality. Summary of the Invention

[0005] The purpose of the present invention is to provide an oscillating cutting columnar collection device suitable for wetland or grass-type lake sediments, so as to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an oscillating cutting columnar collection device suitable for wetland or grass-type lake sediments, comprising:

[0007] The frame structure consists of a fixed rod, a vibrating base plate, and a movable base plate. The lower end of the fixed rod is fixedly connected to the vibrating base plate through a mounting housing in which a vibrator is installed. The movable base plate is coaxially arranged below the vibrating base plate, and the two are fixedly connected by three movable connecting rods.

[0008] Sampling assembly: The sampling assembly includes a hollow sampler. The bottom of the movable base plate is inserted with a hollow sampler that can contact the lake soil. A suction cup is set above the hollow sampler, which can move up and down and can absorb and seal the upper end of the hollow sampler.

[0009] Pushing and adsorption linkage mechanism: The pushing and adsorption linkage mechanism includes a mud guard base plate, an inner screw rod sleeve, an outer screw rod slider, an outer screw rod and an inner screw rod slider. The mud guard base plate is located at the bottom of the equipment, and the upper end is fixedly connected to the bottom of the inner screw rod sleeve through three linkage connecting rods. The linkage connecting rod passes through the movable base plate and is slidably connected to it. The outer screw rod slider is nested in the inner screw rod sleeve; the lower end of the outer screw rod slider is fixedly connected to the outer screw rod, and the upper end is fixedly connected to the connecting rod; the connecting rod is rotatably connected to the bottom of the vibration base plate, the lower end of the outer screw rod is inserted into the inner screw rod slider, and the inner screw rod slider is fixed to the upper end of the suction cup; the inner screw rod sleeve and the outer screw rod slider, as well as the outer screw rod and the inner screw rod slider are connected by means of roller screws;

[0010] The cutting knife assembly installed on the fender bottom plate: the cutting knife assembly includes a cutting knife, and the cutting knife can be rotated on the fender bottom plate.

[0011] Preferably, two rope rings for hanging ropes are provided at the upper end of the fixing rod, and the output end of the vibrator is in contact with and connected to the vibration base plate for vibrating the vibration base plate.

[0012] Preferably, the suction cup is fixedly connected to the inner screw slider through a connecting ring, a limit plate is fixedly provided on the surface of the connecting ring, a slide groove is provided on the surface of the limit plate, and a limit rod fixedly connected to the upper end of the movable base plate is slidably installed in the slide groove.

[0013] Preferably, a glass ring is fixedly provided at one end of the movable bottom plate close to the suction cup, and the upper surface of the glass ring can contact with the suction cup.

[0014] Preferably, the lower end of the hollow sampler can pass through the hole provided in the center of the mud guard bottom plate, so as to be inserted into the soil.

[0015] Preferably, the cutting knife assembly also includes a cutting knife disc and a driving motor. The cutting knife disc is rotatably arranged on the mud guard base plate. Several cutting knives are fixedly arranged on the outer ring of the cutting knife disc. The inner ring of the cutting knife disc is provided with a gear ring that is meshed with the driving gear. The driving gear is fixedly connected to the rotating shaft of the driving motor fixed on the mud guard base plate. A sealing cover is provided above the cutting knife disc to cover the driving motor, driving gear and gear ring to prevent water from entering and affecting the operation of the driving motor.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) This device uses the principle of the difference in force and resistance on different areas and combines two sets of screw sliders in opposite directions to realize the movement of the suction cup. The suction cup adsorbs the hollow sampler to prevent the sample inside the hollow sampler from falling.

[0018] Since the mud guard base plate is in the shape of a disc, the resistance it faces from the surface of the mud and sand is greater than that of the hollow sampler. Therefore, as the device gradually descends and drives the hollow sampler downward into the soil, the mud guard base plate moves relative to the movable base plate toward the movable base plate. When the mud guard base plate moves, it drives the inner screw rod sleeve fixedly connected to it to move relative to the movable base plate. Since the inner screw rod sleeve is connected to the outer screw rod slider pair, when the inner screw rod sleeve moves, it drives the outer screw rod slider to rotate relative to the vibrating base plate. The rotation of the outer screw rod slider drives the outer screw rod fixedly connected to it to rotate. Since the outer screw rod is connected to the inner screw rod slider pair, when the outer screw rod rotates, the inner screw rod slider will move downward. When the inner screw slider moves, it drives the suction cup on it to move in the same direction until the suction cup is adsorbed on the glass ring on the fixed ring. The suction cup will form a negative pressure state in the hollow sampler. The sediment that has been sampled in the hollow sampler will not fall under the suction force of the negative pressure, thereby preventing the sediment sample from falling after the sampling is completed.

[0019] Through the mutual cooperation of the above two sets of screw sliders, the suction cup can move downward synchronously with the hollow sampler until the suction cup is adsorbed on the hollow sampler. The suction cup creates a negative pressure in the hollow sampler to prevent the sediment from falling. In addition, by setting the suction cup, the stability of the hollow sampler can be improved, preventing the hollow sampler from falling when sampling is completed.

[0020] (2) The hollow sampler and the mudguard in the device are in contact with the bottom surface of the lake. When the device is inserted into the lake, the switch of the drive motor in the device is turned on. The drive motor drives the drive gear to rotate, which in turn drives the cutting disc to rotate through the ring gear. The rotation of the cutting disc drives the cutting blade to move. The cutting blade contacts the aquatic plants and cuts the aquatic plants in the collection environment to prevent the aquatic plants from affecting the sampling work in the sampling area.

[0021] (3) The present invention adopts a pulse oscillator; after the hollow sampler and the mud guard bottom plate come into contact with the bottom surface of the lake, the pulse oscillator vibrates the device and the hollow sampler moves downward under the action of the device's own gravity. Since the hollow sampler is hollow, its interior will be filled with sampled sediment while the hollow sampler moves downward. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is a schematic structural diagram of an oscillating cutting columnar collection device suitable for wetland or grass-type lake sediments according to the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of the inner threaded rod sleeve of the oscillating cutting columnar collection device suitable for wetland or grass-type lake sediments of the present invention;

[0024] Figure 3 for Figure 2 A local enlarged view of point A;

[0025] Figure 4 The present invention is a schematic structural diagram of the mud guard base plate and cutting disc of the oscillating cutting columnar collection device suitable for wetland or grass-type lake sediments.

[0026] In the figure: 1. fixed rod, 101. vibrating base plate, 102. movable connecting rod, 103. movable base plate, 104. hollow sampler, 1041. glass ring, 105. mounting shell, 106. vibrator, 201. connecting rod, 202. outer screw rod slider, 203. inner screw rod sleeve, 204. outer screw rod, 205. inner screw rod slider, 206. suction cup, 207. limit plate, 208. limit rod, 209. connecting ring, 210. fixed ring, 301. linked connecting rod, 302. mud guard base plate, 303. cutting disc, 304. cutting knife, 305. gear ring, 306. driving motor, 307. driving gear, 308. sealing cover, 4. rope ring. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1-4 , the present invention provides a technical solution:

[0029] like Figure 1 As shown, in order to improve the stability of the sampled samples, an oscillating cutting columnar collection device suitable for wetland or grass-type lake sediments is proposed. The frame structure includes: a fixed rod 1, a vibrating base plate 101, and a movable base plate 103. The upper end of the fixed rod 1 is fixedly connected to two rope rings 4, and a rope can be connected to the rope ring 4. The device can be extended into the lake and placed on the bottom surface of the lake through the rope.

[0030] The lower end of the fixing rod 1 is detachably connected to the upper surface of the mounting shell 105. The connection contact portion between the fixing rod 1 and the mounting shell 105 is sealed with a sealing strip to prevent water from entering the mounting shell 105 and affecting the vibrator 106 therein. The mounting shell 105 is hollow cylindrical. The vibrator 106 and a battery for powering the vibrator 106 are fixedly arranged inside the mounting shell 105. The vibrator 106 adopts an existing pulse oscillator. The output end of the vibrator 106 can be in contact and connected with the upper surface of the vibration base plate 101. The vibration base plate 101 is disc-shaped. The vibration action of the vibrator 106 can make the frame structure of the device vibrate. Since the mud layer on the bottom of the lake is soft, the hollow sampler 104 in the sampling assembly installed on the frame structure can be extended into the mud layer under the vibration of the vibrator 106.

[0031] The lower surface of the vibrating base plate 101 is fixedly connected to the upper end of the movable connecting rod 102. There are three movable connecting rods 102, which are fixedly arranged on the lower surface of the movable base plate 103 in a circumferentially equidistant manner. The lower end of the movable connecting rod 102 is fixedly connected to the movable base plate 103. The movable base plate 103 is coaxially arranged below the vibrating base plate 101. The circumference of the movable base plate 103 is the same as that of the vibrating base plate 101. The movable base plate 103 is in a circular shape, and its inner surface is fixedly connected to the outer surface of the hollow sampler 104 in the sampling assembly. The hollow sampler 104 adopts a hollow PVC pipe. The hollow sampler 104 can contact the surface of the mud and sand and extend into the mud and sand layer.

[0032] While the vibrating base plate 101 moves downward under the influence of the vibration of the vibrator 106, the movable connecting rod 102 drives the movable base plate 103 to move in the same direction, and the movable base plate 103 drives the hollow sampler 104 thereon to move in the same direction and gradually extend into the mud and sand layer. Since the hollow sampler 104 is hollow, its interior will be filled with mud and sand while the hollow sampler 104 moves downward.

[0033] The push-adsorption linkage mechanism includes a mud guard base plate 302, an inner-grooved screw sleeve 203, an outer-grooved screw slider 202, an outer-grooved screw 204, and an inner-grooved screw slider 205. The mud guard base plate 302 is located at the bottom of the device, and its lower surface can contact the bottom of the lake. The installation position of the mud guard base plate 302 is coaxially installed with the movable base plate 103. The upper end of the mud guard base plate 302 is fixedly connected to the lower end of the linkage connecting rod 301, and the upper end of the linkage connecting rod 301 is fixedly connected to the lower surface of the inner-grooved screw sleeve 203.

[0034] The inner threaded screw sleeve 203 is nested inside the outer threaded rod slider 202, and the inner threaded screw sleeve 203 and the outer threaded rod slider 202 are connected by a roller screw. When the mud guard base plate 302 moves upward relative to the movable base plate 103, the mud guard base plate 302 drives the inner threaded screw sleeve 203 to move upward, and the movement of the inner threaded screw sleeve 203 drives the outer threaded rod slider 202 to rotate;

[0035] The upper end of the outer screw slider 202 is coaxially fixedly connected to the lower end of the connecting rod 201, and the upper end of the connecting rod 201 is coaxially rotatably installed on the lower surface of the vibration base plate 101. The lower end of the outer screw slider 202 is coaxially fixedly connected to the outer screw rod 204, and the lower end of the outer screw rod 204 is inserted into the inner screw slider 205. The thread on the inner surface of the inner screw slider 205 is opposite to the thread extension direction of the inner screw sleeve 203, and is connected to the inner screw slider 205 by a roller screw. The lower end of block 205 is fixedly connected to the upper end of the connecting ring 209, and the lower end of the connecting ring 209 is fixedly connected to the suction cup 206. When the outer screw slider 202 rotates, it drives the outer screw rod 204 connected to it to rotate synchronously. The rotation of the outer screw rod 204 drives the inner screw slider 205 connected to it to move downward, and the inner screw slider 205 drives the connecting ring 209 and the suction cup 206 connected to it to move in the same direction until the suction cup 206 contacts the glass ring 1041 on the fixed ring 210.

[0036] A fixing ring 210 is fixedly provided on the lower surface of the inner threaded rod sleeve 203, and a glass ring 1041 is fixedly provided on the upper end of the fixing ring 210. By providing the glass ring 1041, the adsorption capacity of the suction cup 206 can be improved. The overall cross-section of the fixing ring 210 is an inverted trapezoid. The upper end of the hollow sampler 104 extends into the fixing ring 210, and the inner surface of the fixing ring 210 is covered with a layer of rubber ring. When the hollow sampler 104 moves downward due to vibration, the upper end of the hollow sampler 104 gradually moves from the upper end of the fixing ring 210 to the lower end of the fixing ring 210. Due to the inverted trapezoidal shape of the fixing ring 210 and the elasticity of the rubber ring on its inner wall, the extrusion restriction force on the hollow sampler 104 during the descending process is increased. Therefore, the structure of the fixing ring 210 and the setting of the internal rubber ring can prevent the hollow sampler 104 from falling off from the fixing ring 210.

[0037] The suction cup 206 is fixedly connected to the inner screw slider 205 through a connecting ring 209. A limit plate 207 is fixedly provided on the surface of the connecting ring 209. A slide groove is provided on the surface of the limit plate 207. A limit rod 208 fixedly connected to the fixed ring 210 is slidably installed in the slide groove. There are four limit rods 208, which are fixedly installed on the fixed ring 210 in a circumferentially equidistant installation manner. By setting the limit rods 208, the positions of the connecting ring 209, the inner screw slider 205 and the suction cup 206 can be limited to ensure that they move in the extension direction of the limit rod 208. A limit block is fixedly provided at the other end of the limit rod 208. When the suction cup 206 descends, the limit plate 207 moves with it along the extension direction of the limit rod 208.

[0038] The cutting knife assembly includes a cutting disc 303, a cutting knife 304 and a driving motor 306, as well as a battery for powering the driving motor 306. The lower surface of the inner screw sleeve 203 is fixedly connected to one end of the linkage connecting rod 301, and the other end of the linkage connecting rod 301 is fixedly connected to the mud guard base plate 302. The mud guard base plate 302 is annular as a whole, and its interior is hollow. One end of the hollow sampler 104 passes through the axis of the mud guard base plate 302. The cutting disc 303 is rotatably set on the mud guard base plate 302. The cutting disc 303 is annular and is set on the outer surface of the mud guard base plate 302. The inner ring of the cutting disc 303 is fixedly provided with a gear ring 305. The gear ring 305 is located in the mud guard base plate 302. The gear ring 305 is meshed with the driving gear 307 on the driving motor 306. 307 is fixedly connected to the output shaft of the driving motor 306, and the driving motor 306 is fixedly set on the mud guard base plate 302. A sealing cover 308 is set above the cutting disc 303, which covers the driving motor 306, a battery for powering the driving motor 306, a driving gear 307 and a ring gear 305. By setting the sealing cover 308, water can be prevented from affecting the operation of the driving motor 306. The driving motor 306 drives the driving gear 307 to rotate, and then drives the cutting disc 303 to rotate around the center of the mud guard base plate 302 through the ring gear 305. A number of cutting knives 304 are fixedly set on the outer ring of the cutting disc 303. The rotation of the cutting disc 303 drives the cutting knives 304 to move. The cutting knives 304 come into contact with the aquatic plants. When the cutting knives 304 move, they can cut the aquatic plants in the collection environment.

[0039] Working principle:

[0040] First, the staff places the device in the lake through the rope on the rope ring 4. Due to the weight of the device itself and the force of gravity, the hollow sampler 104 and the mud guard bottom plate 302 in the device are in contact with the bottom surface of the lake.

[0041] During the process of extending the device into the lake, the drive motor 306 in the device is turned on by remote control, and the drive motor 306 drives the drive gear 307 to rotate, and then drives the cutting disc 303 to rotate around the center of the mud guard bottom plate 302 through the ring gear 305. A number of cutting knives 304 are fixedly set on the outer ring of the cutting disc 303. The rotation of the cutting disc 303 drives the cutting knives 304 to move, and the cutting knives 304 come into contact with the aquatic plants. When the cutting knives 304 move, they can cut the aquatic plants in the collection environment until the hollow sampler 104 in the device and the mud guard bottom plate 302 come into contact with the bottom surface of the lake. The cutting of the aquatic plants by the cutting knives 304 prevents the aquatic plants from affecting the subsequent sediment sampling work.

[0042] After the hollow sampler 104 and the mud guard bottom plate 302 come into contact with the bottom surface of the lake, the vibrator 106 is turned on by remote control. The vibration of the vibrator 106 can make the vibration bottom plate 101 vibrate, thereby driving the entire device to vibrate. When the device vibrates, since the surface layer under the lake is soft, the hollow sampler 104 on the movable bottom plate 103 moves downward along the extension direction of the fixed ring 210 under the influence of the vibration force and gradually extends into the mud and sand layer. Since the hollow sampler 104 is hollow, its interior will be filled with mud and sand while it moves downward, thereby realizing mud and sand sampling.

[0043] Since the mud guard base plate 302 is in the shape of a disc, due to its own shape, the resistance it encounters from the surface of the mud and sand is greater than that of the hollow sampler 104. Therefore, while the device vibrates and gradually drives the hollow sampler 104 downward into the soil, the mud guard base plate 302 moves relative to the movable base plate 103 toward the movable base plate 103. When the mud guard base plate 302 moves, it drives the inner screw rod sleeve 203 fixed thereto to move upward relative to the movable base plate 103. Since the inner screw rod sleeve 203 is connected to the outer screw rod slider 202 by a roller screw, when the inner screw rod sleeve 203 moves upward, it drives the outer screw rod slider 202 to rotate relative to the vibrating base plate 101. The rotation of the outer screw rod slider 202 drives the outer screw rod 204 fixed thereto to rotate. Since the outer screw rod 204 is connected to the inner screw rod slider 205 by a roller screw, when the outer screw rod 204 rotates, the inner screw rod slider 205 will move downward.

[0044] When the inner screw slider 205 moves, the suction cup 206 on it is driven to move in the same direction until the suction cup 206 is adsorbed on the glass ring 1041 on the fixed ring 210. When the suction cup 206 is adsorbed on the glass ring 1041 on the fixed ring 210, a negative pressure state is formed in the hollow sampler 104. The sediment sample that has been sampled in the hollow sampler 104 will not fall under the suction force of the negative pressure, thereby ensuring the stability of the sediment therein and preventing the sampled sample from falling after the sampling is completed.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An oscillating, cutting columnar collection device suitable for wetland or grass-type lake sediments, characterized by: include: A frame structure consisting of a fixed rod (1), a vibration base plate (101), and a movable base plate (103): the lower end of the fixed rod (1) is fixedly connected to the vibration base plate (101) via a mounting housing (105) in which a vibrator (106) is mounted; a movable base plate (103) is coaxially arranged below the vibration base plate (101), and the two are fixedly connected via three movable connecting rods (102); Sampling assembly: The sampling assembly includes a hollow sampler (104), the bottom of the movable bottom plate (103) is inserted with the hollow sampler (104) capable of contacting the lake bottom mud; a suction cup (206) is provided above the hollow sampler (104) and can move up and down and can absorb and seal the upper end of the hollow sampler (104); Pushing and adsorption linkage mechanism: The pushing and adsorption linkage mechanism includes a mud guard base plate (302), an inner threaded rod sleeve (203), an outer threaded rod slider (202), an outer threaded rod (204) and an inner threaded rod slider (205), wherein the mud guard base plate (302) is located at the bottom of the device, and the upper end is fixedly connected to the bottom of the inner threaded rod sleeve (203) through three linkage connecting rods (301), the linkage connecting rods (301) pass through the movable base plate (103) and are slidably connected thereto, and the outer threaded rod slider (204) is nested in the inner threaded rod sleeve (203) 202); the lower end of the outer screw slider (202) is fixedly connected to the outer screw (204), and the upper end is fixedly connected to the connecting rod (201); the connecting rod (201) is rotatably connected to the bottom of the vibration base plate (101), the lower end of the outer screw (204) is inserted into the inner screw slider (205), and the inner screw slider (205) is fixed to the upper end of the suction cup (206); the inner screw sleeve (203) and the outer screw slider (202), the outer screw (204) and the inner screw slider (205) are connected by means of a roller screw; A cutting knife assembly installed on a fender bottom plate (302): the cutting knife assembly comprises a cutting knife (304), and the cutting knife (304) is capable of rotating on the fender bottom plate (302).

2. The oscillating cutting columnar collection device suitable for wetland or grass-type lake sediments according to claim 1 is characterized by: Two rope rings (4) for hanging ropes are provided at the upper end of the fixing rod (1), and the output end of the vibrator (106) is in contact with and connected to the vibration base plate (101) for vibrating the vibration base plate (101).

3. The oscillating cutting columnar collection device suitable for wetland or grass-type lake sediments according to claim 1 is characterized by: The suction cup (206) is fixedly connected to the inner screw slider (205) via a connecting ring (209), and a limit plate (207) is fixedly provided on the surface of the connecting ring (209). A sliding groove is provided on the surface of the limit plate (207), and a limit rod (208) fixedly connected to the upper end of the movable base plate (103) is slidably installed in the sliding groove.

4. The oscillating cutting columnar collection device suitable for wetland or grass-type lake sediments according to claim 3 is characterized by: A glass ring (1041) is fixedly provided at one end of the movable bottom plate (103) close to the suction cup (206), and the upper surface of the glass ring (1041) is capable of contacting the suction cup (206).

5. The oscillating cutting columnar collection device suitable for wetland or grass-type lake sediments according to claim 1 is characterized by: The lower end of the hollow sampler (104) can pass through a hole provided in the center of the mud guard bottom plate (302) to facilitate insertion into the soil.

6. The oscillating cutting columnar collection device for wetland or grass-type lake sediments according to claim 1 is characterized by: The cutting blade assembly further comprises a cutting blade disc (303) and a driving motor (306). The cutting blade disc (303) is rotatably arranged on the mud guard base plate (302). A plurality of cutting blades (304) are fixedly arranged on the outer ring of the cutting blade disc (303). The inner ring of the cutting blade disc (303) is provided with a gear ring (305) meshing with a driving gear (307). The driving gear (307) is fixedly connected to a rotating shaft of a driving motor (306) fixedly arranged on the mud guard base plate (302). A sealing cover (308) is provided above the cutting blade disc (303) to cover the driving motor (306), the driving gear (307) and the gear ring (305) to prevent water from entering and affecting the operation of the driving motor (306).

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