Portable forestry water quality information collecting and surveying device

Abstract

The invention discloses a portable forestry water quality information collecting and surveying device, and belongs to the technical field of water quality detecting and sampling equipment.The portable forestry water quality information collecting and surveying device comprises a buoyancy control assembly, the buoyancy control assembly comprises a sampling barrel, an outer cylinder is fixedly connected to the lower end of the sampling barrel, an inner cylinder is rotationally connected into the outer cylinder, and a motor is fixedly connected to the upper end of the outer cylinder; the output end of the motor is fixedly connected with the inner cylinder, the side wall of the outer cylinder is fixedly connected with a water storage round box, the lower end of the outer cylinder is fixedly connected with a valve shell, and the interior of the valve shell is rotatably connected with a valve element communicated with the inner cylinder. The sampling barrel moves downwards, water on the water surface is collected through the upper end of the sampling barrel, generated water flow can push the sampling barrel to move when the two-way water pump drains water, the collection range of the water on the water surface is expanded, and a collected water sample is closer to the actual condition of a water body.

Description

Technical Field

[0001] The invention relates to the technical field of water quality detection and sampling equipment, in particular to a portable forestry water quality information collection and surveying device. Background Art

[0002] Forestry water quality information collection refers to the process of systematically monitoring and collecting data on the water quality of forest waters and their surrounding environment through professional monitoring equipment and technical means in forest ecosystems. This work usually involves the measurement of various physical, chemical and biological indicators in water bodies, including water temperature, pH value, dissolved oxygen, turbidity, nutrient concentration and pollutant detection, etc., to assess the health of water quality and its impact on forest ecology. Forestry water quality information collection not only helps to understand the quality and changing trends of water sources, but also provides a scientific basis for forest management and protection, ecological restoration, and rational use of forest resources. In addition, this process can also support the study of forest hydrological cycles, help formulate effective water resources management strategies and ecological protection measures to promote sustainable development and ecological balance. Through continuous water quality monitoring, water pollution or ecological imbalance problems can be discovered in a timely manner, providing important data support for protecting forest ecological environment and maintaining biodiversity.

[0003] A Chinese patent discloses a water quality sampling device (authorization announcement number 202410008670.1), which includes a floating component, multiple sampling components, a lifting mechanism and a locking mechanism; the entire device is suitable for floating on the water surface to be sampled through the floating component, and multiple sampling components are arranged at equal intervals along the circumferential direction of the floating component in the water area below the floating component. The lifting mechanism is installed on the floating component and cooperates with the sampling component so that the sampling component moves vertically under the water surface under the drive of the lifting mechanism; the locking mechanism is installed on the floating component; in the process of the sampling component moving downward, the locking mechanism is suitable for locking the position of each sampling component in turn, so that the multiple sampling components are located at different heights below the water surface.

[0004] When conducting water quality surveys, we found that oil and some floating pollutants usually float on the water surface. However, the above patents are often unable to effectively extract water samples from the water surface in practical applications. At present, the main water surface sampling method relies on staff to use containers to directly take water from the water surface. The limitation of this method is that it can only cover a very small area, and it is difficult to obtain water samples from the top layer of the water surface when sampling. Therefore, the collected water samples cannot fully reflect the actual conditions of the water body, which affects the accuracy of the survey results. For this reason, a portable forestry water quality information collection and surveying device is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a portable forestry water quality information collection and surveying device to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A portable forestry water quality information collection and surveying device comprises a buoyancy control component, which comprises a sampling cylinder, wherein the lower end of the sampling cylinder is fixedly connected with an outer cylinder, the inner part of the outer cylinder is rotatably connected with the inner cylinder, the upper end of the outer cylinder is fixedly connected with a motor, and the output end of the motor is fixedly connected with the inner cylinder, a water storage box is fixedly connected to the side wall of the outer cylinder, the lower end of the outer cylinder is fixedly connected with a valve shell, the inner part of the valve shell is rotatably connected with a valve core connected with the inner cylinder, a two-way water pump is fixedly connected to the inner part of the valve core, a water suction pipe is connected to the front side wall of the valve shell, and a drainage pipe is connected to the right side wall of the valve shell, two rows of holes are drilled on the outer cylinder and the inner cylinder, and the two rows of holes are distributed in the sampling cylinder and the water storage box, the lower side wall of the water storage box is fixedly connected with a protective cylinder, and the water suction pipe and the drainage pipe are both arranged through the protective cylinder, the upper end of the sampling cylinder is fixedly connected with a water inlet detection component, the inner part of the sampling cylinder is fixedly connected with a container partition component, the container partition component is fixedly connected with a float valve component, and the sampling cylinder is sleeved with a posture limit component.

[0007] As a further solution of the present invention, the water inlet detection assembly includes a water wheel blade group rotatably connected to the upper end of the sampling tube, and a photoelectric sensor is arranged between the water wheel blade group and the sampling tube.

[0008] As a further solution of the present invention, the container partition assembly includes two supporting plates fixedly connected to the inside of the sampling tube, and two partitions are fixedly connected to the side walls of the two supporting plates.

[0009] As a further solution of the present invention, the float valve assembly includes a plurality of round tubes distributed on one side of the partition, and the upper and lower ends of the round tubes are respectively plugged into the two bearing plates.

[0010] As a further solution of the present invention, a float is arranged on the upper side of the circular tube, a sealing film is fixedly connected between the float and the bearing plate, and a spring plate is fixedly connected to the lower end of the circular tube.

[0011] As a further solution of the present invention, a sealing ring plate located on the upper side of the spring plate is fixedly connected inside the circular tube, a sealing sheet abutting against the upper side wall of the sealing ring plate is arranged inside the circular tube, and a tension spring is fixedly connected between the spring plate and the sealing sheet.

[0012] As a further solution of the present invention, a draw rope is fixedly connected between the sealing sheet and the float, and drain holes are drilled on both left and right side walls of the circular tube.

[0013] As a further solution of the present invention, the posture limiting assembly includes a C-shaped airbag sleeved on the sampling tube, and the inner side wall of the C-shaped airbag is fixedly connected with an arc plate.

[0014] As a further solution of the present invention, an air pipe is connected to the water storage round box, and the air pipe is connected to the sampling tube.

[0015] As a further solution of the present invention, the upper side wall of the arc plate is fixedly connected to the limiting tube, and the upper end of the air pipe passes through the limiting tube.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention is used, water can be drawn from below the water surface through a two-way water pump, which can increase the weight of the sampling tube and move the sampling tube downward, thereby collecting water on the water surface through the upper end of the sampling tube. When the two-way water pump is used to drain water, the generated water flow can also push the sampling tube to move, thereby expanding the collection range of the surface water, and further making the collected water sample closer to the actual condition of the water body.

[0017] 2. When the present invention is used, the posture of the two-way water pump can be adjusted to change from a pumping state to a drainage state after the water on the water surface enters the sampling tube through the cooperation of the water inlet detection component, the container separation component and the float valve component. This will adjust the weight of the sampling tube, thereby avoiding affecting the collection effect due to the change in the weight of the sampling tube during the water collection process.

[0018] 3. When the present invention is used, the posture limiting assembly can make the sampling tube remain perpendicular to the water surface when collecting water, so that the upper end of the sampling tube remains parallel to the water surface, further improving the effect of water collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a state diagram of a portable forestry water quality information collection and survey device floating on the water surface; Figure 2 A three-dimensional image of a portable forestry water quality information collection and survey device; Figure 3 This is a cross-sectional view of a portable forestry water quality information collection and survey device; Figure 4 It is a structural schematic diagram of the buoyancy control component part of a portable forestry water quality information collection and survey device; Figure 5 This is a structural schematic diagram of a water inlet detection component in a portable forestry water quality information collection and survey device; Figure 6 It is a structural schematic diagram of the container separation component part of a portable forestry water quality information collection and survey device; Figure 7 It is a structural schematic diagram of the float valve component part of a portable forestry water quality information collection and survey device; Figure 8 for Figure 7 Enlarged view of point A in the middle.

[0020] In the figure: 1. Buoyancy control assembly; 101. Sampling cylinder; 102. Outer cylinder; 103. Inner cylinder; 104. Motor; 105. Water storage box; 106. Valve housing; 107. Valve core; 108. Two-way water pump; 109. Suction pipe; 110. Drain pipe; 111. Drain hole; 112. Protective cylinder; 2. Water inlet detection component; 201. Water wheel blade assembly; 202. Photoelectric sensor; 3. Container partition assembly; 301. Carrying plate; 302. Partition plate; 4. Float valve assembly; 401. round tube; 402. float; 403. sealing membrane; 404. spring plate; 405. sealing ring plate; 406. sealing sheet; 407. tension spring; 408. pull rope; 409. drain hole; 5. Posture limiting assembly; 501. C-shaped airbag; 502. arc plate; 503. air pipe; 504. limiting tube. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figures 1 to 6In an embodiment of the present invention, a portable forestry water quality information collection and surveying device includes a buoyancy control component 1, which includes a sampling cylinder 101 with an inclined upper port, an outer cylinder 102 is plugged and fixedly connected to the lower end of the sampling cylinder 101, an inner cylinder 103 is rotatably connected to the upper inner wall of the outer cylinder 102, a motor 104 is fixedly connected to the upper end of the outer cylinder 102 by bolts, and the inner cylinder 103 can be driven to rotate by the output end of the motor 104 being fixedly connected to the inner cylinder 103, a water storage round box 105 located at the lower side of the sampling cylinder 101 is fixedly connected to the side wall of the outer cylinder 102, a valve housing 106 is fixedly connected to the lower end of the outer cylinder 102 and connected to the valve housing 106, and the valve housing 106 is rotatably connected to a valve core 107 connected to the inner cylinder 103 through a rotating shaft installed on the lower inner wall, and the upper end of the valve core 107 is connected and fixed to the lower end of the inner cylinder 103, A two-way water pump 108 is fixedly connected to the inside of the valve core 107 by a snap-on connection. The two-way water pump 108 can realize the conversion function of pumping and draining water at one port. The structure and principle of the two-way water pump 108 are all existing technologies and are not repeated here. The front side wall of the valve shell 106 is connected and fixedly connected with a pumping pipe 109, and the right side wall of the valve shell 106 is connected and fixedly connected with a drain pipe 110. Two distribution sampling tubes 101 and row holes 111 inside the water storage round box 105 are drilled on the outer cylinder 102 and the inner cylinder 103, wherein the two row holes 111 inside the water storage round box 105 correspond to each other, and the angles of the two row holes 111 inside the sampling tube 101 differ by 90 degrees. A protective tube 112 that protects the valve shell 106 is fixedly connected to the lower side wall of the water storage round box 105. At the same time, the thickness of the bottom of the protective tube 112 is different, which is not shown in the figure.

[0023] The center of gravity of the buoyancy control component 1 can be balanced by different thicknesses, so that the buoyancy control component 1 can maintain a stable vertical state during the floating process, and the water suction pipe 109 and the drainage pipe 110 are both set through the protective tube 112, and the upper end of the sampling tube 101 is fixedly connected to a water inlet detection component 2 for detecting whether water enters the sampling tube 101, and the inside of the sampling tube 101 is fixedly connected to a container separation component 3 for separating and processing water, and a float valve that uses buoyancy to drain water is fixedly connected to the container separation component 3 The sampling tube 101 is provided with a posture limiting assembly 5 for keeping the buoyancy control assembly 1 in a stable posture in the water. During use, the staff needs to fix the traction rope on the side wall of the sampling tube 101 to facilitate the recovery of the sampling tube 101 in the later stage. When the sampling tube 101 moves down until the upper oblique opening is lower than the water surface, the water on the surface will flow into the sampling tube 101, and at the same time, the floating objects on the surface will flow into the sampling tube 101 under the action of the water flow. When the staff puts the device underwater, first start the two-way The water pump 108 is used to collect the water under the water, and the water enters the water storage box 105 through the row holes 111, thereby increasing the weight of the sampling tube 101, and causing the sampling tube 101 to start to move downward. When the upper end of the sampling tube 101 is lower than the water surface, the water on the surface starts to enter the sampling tube 101. At this time, the motor 104 is started through the water inlet detection component 2, so that the motor 104 drives the valve core 107 to rotate through the inner cylinder 103, and the two row holes in the sampling tube 101 are rotated by the rotation of the inner cylinder 103. 111 corresponds to, and at the same time switches the mode of the two-way water pump 108, so that the two-way water pump 108 changes from the pumping mode to the drainage mode. When the sampling tube 101 takes in water, the counterweight water can be discharged to the bottom of the sampling tube 101 through the float valve assembly 4 at the same time, so that the two-way water pump 108 draws out the water at the bottom of the sampling tube 101 and discharges it from the drain pipe 110, thereby reducing the weight of the sampling tube 101, thereby being able to push the sampling tube 101 to move a certain distance, thereby increasing the range of water collection of the sampling tube 101 on the water surface.

[0024] The water inlet detection component 2 includes a water wheel blade group 201 which is rotatably connected to the upper end of the sampling tube 101 through a rotating shaft, and the water wheel blade group 201 and the rotating shaft of the sampling tube 101 have a certain damping effect to prevent the water wheel blade group 201 from rotating and being detected by the photoelectric sensor 202 due to the placement of the device when not in use. A photoelectric sensor 202 capable of detecting the rotation state of the water wheel blade group 201 is arranged between the water wheel blade group 201 and the inner wall of the sampling tube 101, wherein the photoelectric sensor 202 is fixedly connected to the inner wall of the sampling tube 101, and the photoelectric sensor 202 is rotatably connected to the water wheel blade group 201. The container partition component 3 includes a fixed connection to the sampling tube 101. Two supporting plates 301 are arranged upper and lower inside the tube 101, and the upper side walls of the two supporting plates 301 are fixedly connected with two partitions 302 of the same height. Through the multiple partitions 302, the container separation assembly 3 inside the sampling tube 101 can be divided into three upper containers and three lower containers. The lower supporting plate 301 is filled with counterweight water, and the liquid level of the counterweight water can be the same as the height of the partition 302. When water flows into the sampling tube 101, the water flow will hit the water wheel blade group 201, causing the water wheel blade group 201 to rotate. At the same time, the photoelectric sensor 202 can detect that the water wheel blade group 201 starts to rotate, and starts the motor 104 through the microprocessor.

[0025] The float valve assembly 4 includes three round tubes 401 distributed on one side of the partition 302, and the upper and lower ends of the round tubes 401 are respectively plugged and fixed on the two bearing plates 301, a float 402 is arranged on the upper side of the round tube 401, a sealing film 403 is fixedly connected between the float 402 and the upper bearing plate 301 by glue, a spring plate 404 is fixedly connected inside the lower end of the round tube 401, a sealing ring plate 405 located on the upper side of the spring plate 404 is fixedly connected inside the round tube 401, and a sealing ring plate 405 is fixedly connected to the inner side of the round tube 401. The sealing sheet 406 is attached to the upper side wall of the sealing ring plate 405, and a tension spring 407 is fixedly connected between the spring plate 404 and the sealing sheet 406. In the initial state, the sealing sheet 406 is pulled by the tension spring 407 to make the sealing sheet 406 and the sealing ring plate 405 close to each other to achieve sealing, so that the counterweight water stored in the lower side bearing plate 301 will not be discharged to the bottom of the sampling tube 101 through the drain hole 409. The sealing sheet 406 is fixedly connected to the side wall opposite to the floating ball 402 with a drawstring 408. The left and right side walls of the circular tube 401 are both opened. The drain hole 409, when water enters the sampling tube 101, the water will first enter the leftmost container of the upper supporting plate 301, so that the round tube 401 moves upward under the action of buoyancy. In order to prevent the weight of the sampling tube 101 from changing and causing it to move downward, the float 402 will pull the sealing sheet 406 under the tension of the pull rope 408, so that the counterweight water in the leftmost container of the lower supporting plate 301 is discharged to the bottom of the sampling tube 101 through the drain hole 409, and then discharged through the two-way water pump 108 to reduce the weight of the sampling tube 101. 01, so that the sampling tube 101 can be stable at a certain height. In addition, after the water collected in the upper supporting plate 301 fills the leftmost container, the water overflows into the middle container. The floating substances in the water of the left container can flow into the middle container through this overflow. When the middle container is full, it can also flow to the rightmost container through overflow. Therefore, the water surface substances collected in the rightmost container are the most abundant. When sampling is needed, the staff can extract the rightmost container.

[0026] Among them, the motor 104, the two-way water pump 108, and the photoelectric sensor 202 are all existing technologies, and their structural principles will not be repeated. At the same time, the device also includes a power supply, a switch, a controller, a power supply cable and other devices, which are not the main technologies and will not be described in detail.

[0027] Example 2: Please refer to Figures 7 and 8Based on Example 1, the posture limiting component 5 includes a C-shaped airbag 501 sleeved on the sampling tube 101, and the open mouth of the C-shaped airbag 501 is arranged opposite to the drain pipe 110, so that when the sampling tube 101 moves, the collected water surface substances will not be blocked by the C-shaped airbag 501, and the inner wall of the C-shaped airbag 501 is fixedly connected to the arc plate 502 by glue bonding, and the water storage round box 105 is connected to the air pipe 503, and the air pipe 503 is connected to the two bearing plates inside the sampling tube 101. The side walls between 301 are connected, and the air pipe 503 can prevent the air pressure from affecting the drainage and pumping of the sampling tube 101 and the water storage box 105. The upper side wall of the arc plate 502 is fixedly connected to the limiting tube 504, and the upper end of the air pipe 503 passes through the limiting tube 504. The air pipe 503 is inserted through the limiting tube 504, so that the air pipe 503 can be effectively maintained in a vertical state, and then the sampling tube 101 can be adjusted to remain in a vertical state for a long time, thereby improving the stability of the sampling tube 101 when collecting surface water.

[0028] The working principle of the present invention is: When the present invention is in use, the staff first places the device on the water surface, and through the air pipe 503 connected to the limit tube 504, the air pipe 503 can be effectively maintained in a vertical state, so that the sampling tube 101 can be adjusted to remain in a vertical state for a long time. At this time, the sampling tube 101 is also in a floating state by itself, and then the staff starts the two-way water pump 108, so that the two-way water pump 108 first collects the underwater water into the water storage round box 105 through the drainage hole 111, thereby increasing the weight of the sampling tube 101, and the sampling tube 101 starts to move downward. When the upper port of the sampling tube 101 is lower than the water surface, the water on the water surface starts to enter the sampling tube 101, and the water flow will hit the water wheel blade group 201, causing the water wheel blade group 201 to rotate. At the same time, the photoelectric sensor 202 can detect that the water wheel blade group 201 starts to rotate, and starts the motor 104 through the microprocessor, so that the motor 104 drives the valve through the inner cylinder 103 The core 107 rotates, and the rotation of the inner cylinder 103 makes the two row holes 111 inside the sampling tube 101 correspond to each other, and at the same time switches the mode of the two-way water pump 108, so that the two-way water pump 108 changes from the pumping mode to the drainage mode. When water enters the sampling tube 101, the water first enters the leftmost container of the upper supporting plate 301, so that the round tube 401 moves upward under the action of buoyancy. In order to prevent the weight of the sampling tube 101 from changing and causing it to move downward, the float 402 will pull the sealing plate 406 under the tension of the pull rope 408, so that the counterweight water in the leftmost container of the lower supporting plate 301 is discharged to the bottom of the sampling tube 101 through the drain hole 409, so that the two-way water pump 108 draws out the water at the bottom of the sampling tube 101 and discharges it from the drain pipe 110, thereby reducing the weight of the sampling tube 101, so that the sampling tube 101 can be pushed to move a certain distance, thereby increasing the range of water collection of the sampling tube 101 on the water surface; After the sampling is completed, the staff can control the motor 104 and switch the mode of the two-way water pump 108 again, so that the two-way water pump 108 can discharge a part of the water collected in the water storage box 105 until the water wheel blade group 201 can no longer be hit by the water flow and stops rotating. The two-way water pump 108 stops draining water. At this time, the sampling tube 101 floats on the water surface and no longer continues to collect surface water. Finally, the staff can recycle the device through the pulling rope.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A portable forestry water quality information collection and surveying device, comprising a buoyancy control component (1), characterized in that: The buoyancy control assembly (1) comprises a sampling cylinder (101), the lower end of the sampling cylinder (101) is fixedly connected to an outer cylinder (102), the inner part of the outer cylinder (102) is rotatably connected to an inner cylinder (103), the upper end of the outer cylinder (102) is fixedly connected to a motor (104), and the output end of the motor (104) is fixedly connected to the inner cylinder (103), a water storage box (105) is fixedly connected to the side wall of the outer cylinder (102), the lower end of the outer cylinder (102) is fixedly connected to a valve housing (106), the inner part of the valve housing (106) is rotatably connected to a valve core (107) connected to the inner cylinder (103), the inner part of the valve core (107) is fixedly connected to a two-way water pump (108), and the front side wall of the valve housing (106) is connected to a water pump (105). 09), the right side wall of the valve housing (106) is connected to a drainage pipe (110), the outer cylinder (102) and the inner cylinder (103) are both provided with two rows of holes (111), and the two rows of holes (111) are distributed inside the sampling tube (101) and the water storage box (105), the lower side wall of the water storage box (105) is fixedly connected to a protective tube (112), and the water suction pipe (109) and the drainage pipe (110) are both arranged to penetrate the protective tube (112), the upper end of the sampling tube (101) is fixedly connected to a water inlet detection component (2), the interior of the sampling tube (101) is fixedly connected to a container partition component (3), the container partition component (3) is fixedly connected to a float valve component (4), and the sampling tube (101) is sleeved with a posture limit component (5).

2. A portable forestry water quality information collection and surveying device according to claim 1, characterized in that: The water inlet detection assembly (2) comprises a water wheel blade assembly (201) rotatably connected to the upper end of the sampling tube (101), and a photoelectric sensor (202) is provided between the water wheel blade assembly (201) and the sampling tube (101).

3. A portable forestry water quality information collection and surveying device according to claim 1, characterized in that: The container partition assembly (3) comprises two supporting plates (301) fixedly connected to the interior of the sampling tube (101), and the upper side walls of the two supporting plates (301) are both fixedly connected to two partition plates (302).

4. A portable forestry water quality information collection and surveying device according to claim 3, characterized in that: The float valve assembly (4) comprises a plurality of circular tubes (401) distributed on one side of the partition plate (302), and the upper and lower ends of the circular tubes (401) are respectively plugged into the two bearing plates (301).

5. A portable forestry water quality information collection and surveying device according to claim 4, characterized in that: A floating ball (402) is arranged on the upper side of the circular tube (401), a sealing film (403) is fixedly connected between the floating ball (402) and the bearing plate (301), and a spring plate (404) is fixedly connected to the lower end of the circular tube (401).

6. A portable forestry water quality information collection and surveying device according to claim 5, characterized in that: A sealing ring plate (405) located on the upper side of the spring plate (404) is fixedly connected inside the circular tube (401), a sealing sheet (406) abutting against the upper side wall of the sealing ring plate (405) is provided inside the circular tube (401), and a tension spring (407) is fixedly connected between the spring plate (404) and the sealing sheet (406).

7. A portable forestry water quality information collection and surveying device according to claim 6, characterized in that: A pull rope (408) is fixedly connected between the sealing sheet (406) and the floating ball (402), and drainage holes (409) are drilled on both left and right side walls of the circular tube (401).

8. A portable forestry water quality information collection and surveying device according to claim 7, characterized in that: The posture limiting assembly (5) comprises a C-shaped airbag (501) sleeved on the sampling tube (101), and an arc-shaped plate (502) is fixedly connected to the inner side wall of the C-shaped airbag (501).

9. A portable forestry water quality information collection and surveying device according to claim 8, characterized in that: The water storage round box (105) is connected to an air pipe (503), and the air pipe (503) is connected to the sampling tube (101).

10. The portable forestry water quality information collection and surveying device according to claim 8, characterized in that: The upper side wall of the arc-shaped plate (502) is fixedly connected to the limiting tube (504), and the upper end of the air pipe (503) passes through the limiting tube (504).

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