Water sample extracting and storing integrated device for water environment monitoring

Abstract

The invention discloses a water sample extracting and storing integrated device for water environment monitoring, and belongs to the field of water environment monitoring, the water sample extracting and storing integrated device comprises a sampling barrel, an auxiliary assembly is fixedly connected to the top of the sampling barrel, and a connecting rod is assembled on the outer wall of the auxiliary assembly; a sliding groove plate is assembled on the side face of the connecting rod, a first magnetic coupler assembly is slidably connected to the inner wall of the sliding groove plate, a first spring is assembled on the inner wall of the sliding groove plate, a first rotating rod is assembled on the side face of the inner wall of the sampling barrel, and the outer wall of the first rotating rod is fixedly sleeved with a ratchet wheel. The electric telescopic rod drives the piston, the first blocking plate and other components to move up and down to control the sampling depth of a water sample, and the rotating device completes self-locking and gear driving through magnetic connection between the first permanent magnet and the first magnetizer, so that the sampling operation is accurately controlled. According to the water sampling device, water sources with different water depths can be sampled in order, and meanwhile, misoperation is avoided in the sampling process through the self-locking mechanism with the structural design.

Description

Technical Field

[0001] The present application relates to the field of water environment monitoring, and in particular to an integrated device for extracting and preserving water samples for water environment monitoring. Background Art

[0002] Environmental monitoring is the foundation for scientific environmental management and environmental law enforcement supervision, and is essential foundational work for environmental protection. The core goal of environmental monitoring is to provide data on the current state of environmental quality and changing trends, assess environmental quality, evaluate current major environmental issues, and serve environmental management.

[0003] The patent document with announcement number CN112198009A discloses an integrated device for extracting and preserving water samples for water environment monitoring, which relates to the technical field of water environment monitoring sampling devices. It solves the problem of existing water sampling devices, in which small particles of impurities in the water can easily clog the filter on the water inlet, requiring staff to frequently remove the sampling container from the water and manually brush and clean it, resulting in a cumbersome, laborious and inconvenient clearing operation. Although the above application document effectively reduces the probability of the water inlet hole being clogged by small particles of floating debris, it only extracts water samples of a single water depth during use, resulting in the acquired data possibly not representing the characteristics of the entire water body. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides an integrated device for extracting and preserving water samples for water environment monitoring, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present application provides an integrated device for extracting and preserving water samples for water environment monitoring, comprising a sampling barrel, the top of which is fixedly connected to an auxiliary component, and the outer wall of which is equipped with a connecting rod; The side of the connecting rod is equipped with a slide plate, the inner wall of the slide plate is slidingly connected to the first magnetic coupling assembly, the inner wall of the slide plate is equipped with a first spring, the side of the inner wall of the sampling barrel is equipped with a first rotating rod, the outer wall of the first rotating rod is fixedly sleeved with a ratchet, the inner wall of the sampling barrel is hinged with a pawl, the outer wall of the first rotating rod is equipped with a first circular gear, the side of the sampling barrel is equipped with a storage box, the top of the storage box is equipped with a second magnetic coupling assembly, the top of the second magnetic coupling assembly is fixedly connected to the first rack, the back of the first rack is equipped with a third spring, the first circular gear and the first rack are meshed with each other, the side of the sampling barrel is equipped with an adding device for adding boric acid, and the side of the sampling barrel is equipped with a rotating device for oscillating boric acid and water samples.

[0006] Preferably, the first magnetic coupler assembly includes a first permanent magnet, which is slidably connected to the inner wall of the slide plate, and a first magnetic conductor is assembled on the side of the first rotating rod, and the first permanent magnet is magnetically connected to the first magnetic conductor.

[0007] Preferably, the second magnetic coupler assembly includes a second permanent magnet, which is slidably connected to the bottom of the inner wall of the storage box, and a second magnetic conductor is slidably connected to the top of the storage box, and the second magnetic conductor is fixedly connected to the bottom of the first rack, and the second permanent magnet is magnetically connected to the second magnetic conductor.

[0008] Preferably, the sliding connecting frame on the side of the inner wall of the sampling barrel is provided with an elastic telescopic block, the top of the elastic telescopic block is fixedly connected to a second spring, the auxiliary component includes an electric telescopic rod, the electric telescopic rod is fixedly connected to the top of the sampling barrel, the bottom of the electric telescopic rod is fixedly connected to a piston, the bottom of the piston is fixedly connected to a first blocking plate, the bottom of the first blocking plate is fixedly connected to a trigger plate, and the front of the inner wall of the sampling barrel is hinged with a second blocking plate.

[0009] Preferably, the adding device includes a first rotating block, which is fixedly connected to the outer wall of the first rotating rod, and a vertical plate is fixedly connected to the top of the storage box. The right side of the vertical plate is rotatably connected to a screw rod through a bearing, and the screw rod movably extends through the vertical plate to the left, and the extended end is fixedly connected to the second rotating block, the outer wall of the screw rod is slidably connected to a sleeve, and the right side of the sleeve is fixedly connected to a baffle.

[0010] Preferably, a boric acid box is fixedly connected to the top of the storage box, the baffle is slidably connected to the inner wall of the boric acid box, and a sealing gasket is provided at the connection between the baffle and the boric acid box.

[0011] Preferably, the rotating device includes a connecting plate, which is fixedly connected to the top of the storage box. The front of the storage box is rotatably connected to a second rotating rod through a bearing. The outer wall of the second rotating rod is fixedly connected to a second circular gear. The front of the baffle is fixedly connected to a second rack.

[0012] Preferably, the second circular gear and the second rack are meshed with each other, and a knocking block is fixedly sleeved on the outer wall of the second rotating rod.

[0013] The benefits of this application are: First, this application uses an electric telescopic rod to drive the piston, first baffle, and other components up and down to control the sampling depth of water samples. The magnetic connection between the first permanent magnet and the first magnetic conductor enables the rotary device to self-lock and drive the gears, thereby precisely controlling the sampling operation. This enables orderly sampling of water sources of varying depths, while the structurally designed self-locking mechanism prevents misoperation during the sampling process.

[0014] Second, this application utilizes a first rotating rod to drive the first and second rotating blocks for delayed actuation, ensuring smooth subsequent movement. Through the movement of the lead screw and sleeve, a baffle drives the boric acid into the storage box, achieving automatic control of boric acid delivery. The precise timing of boric acid drop ensures proper chemical treatment after sampling, facilitating subsequent analysis.

[0015] Third, the present invention utilizes the movement of the baffle to drive the second rack and second circular gear, which in turn propel the second rotating rod to oscillate the striking block, ensuring thorough mixing of the water sample and the administered boric acid. This improves mixing uniformity, ensures a full reaction between the water sample and the boric acid, and enhances the accuracy and effectiveness of subsequent analysis and testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings that constitute part of this application are used to provide a further understanding of this application and make other features, objects and advantages of this application more apparent. The illustrative embodiment drawings of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application. In the drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front cross-sectional structural diagram of the present invention; Figure 3 Schematic diagram of part of the structure of the present invention Figure 1 ; Figure 4 Schematic diagram of part of the structure of the present invention Figure 2 ; Figure 5 For the present invention Figure 2 A in the middle is an enlarged structural diagram; Figure 6 For the present invention Figure 3 The enlarged structural diagram at B in the middle; Figure 7 For the present invention Figure 4 Enlarged structural diagram at point C in the middle.

[0017] In the above figure, 1. Sampling barrel; 21. Slide plate; 22. First spring; 23. First permanent magnet; 24. First magnetizer; 25. First rotating rod; 26. Ratchet; 27. Pawl; 28. Elastic telescopic block; 29. Second spring; 210. First circular gear; 211. Second magnetizer; 212. Second permanent magnet; 213. Storage box; 214. Third spring; 3. Adding device; 31. First rotating block; 32. Vertical plate; 33. Screw; 34. Second rotating block; 35. Boric acid box; 36. Baffle; 37. Sleeve; 4. Rotating device; 41. Connecting plate; 42. Second rotating rod; 43. Knocking block; 44. Second circular gear; 45. Second rack; 5. Auxiliary component; 51. Electric telescopic rod; 52. Piston; 53. First blocking plate; 54. Trigger plate; 55. Second blocking plate; 6. Connecting rod. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate to describe the embodiments of the present application here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0020] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0021] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0022] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0023] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] Example 1, see Figures 1-6 This embodiment provides an integrated device for extracting and preserving water samples for water environment monitoring, including a sampling barrel 1, an auxiliary component 5 fixedly connected to the top of the sampling barrel 1, and a connecting rod 6 mounted on the outer wall of the auxiliary component 5; A slide plate 21 is installed on the side of the connecting rod 6, and the inner wall of the slide plate 21 is slidingly connected to the first magnetic coupling assembly. The inner wall of the slide plate 21 is equipped with a first spring 22. The inner wall side of the sampling barrel 1 is equipped with a first rotating rod 25. The outer wall of the first rotating rod 25 is fixedly sleeved with a ratchet 26. The inner wall of the sampling barrel 1 is hinged with a pawl 27. The outer wall of the first rotating rod 25 is equipped with a first circular gear 210. A storage box 213 is installed on the side of the sampling barrel 1. The top of the storage box 213 is equipped with a second magnetic coupling assembly. The top of the second magnetic coupling assembly is fixedly connected to the first rack. The back of the first rack is equipped with a third spring 214. The first circular gear 210 is meshed with the first rack. The side of the sampling barrel 1 is equipped with an adding device 3 for adding boric acid. The side of the sampling barrel 1 is equipped with a rotating device 4 for oscillating boric acid and water samples, realizing the integrated functions of sampling, preservation, processing and adding chemical substances of water samples. Through the first magnetic coupling assembly, the second magnetic coupling assembly and other components, it is ensured that the various components can cooperate smoothly during use, thereby enhancing the efficiency and reliability of sampling and preserving water samples. This device has the ability to efficiently sample and preserve water samples, add and mix chemicals, and is easy to operate and maintain. The first magnetic coupling assembly includes a first permanent magnet 23, which is slidably connected to the inner wall of the slide plate 21. The first rotating rod 25 is equipped with a first magnet 24 on the side. The first permanent magnet 23 is magnetically connected to the first magnet 24, and magnetic coupling technology is adopted, using the magnetic force between the first permanent magnet 23 and the first magnet 24 for connection and transmission. Through the sliding connection, the magnetic assembly can be flexibly adjusted to provide more stable and precise control, ensure the reliable connection of each part, and enhance the stability and durability of the device. The second magnetic coupling assembly includes a second permanent magnet 212, which is slidably connected to the bottom of the inner wall of a storage box 213. A second conductive magnet 211 is slidably connected to the top of the storage box 213, and the second conductive magnet 211 is fixedly connected to the bottom of the first rack. The magnetic connection between the second permanent magnet 212 and the second conductive magnet 211 further enhances the magnetic coupling function of the device. The design of the second magnetic coupling assembly ensures stability and precision when opening and closing the storage box 213 and adding items such as chemicals or water samples. Magnetic coupling provides a contactless transmission method, reducing wear and improving the durability of the device. The sliding connecting frame on the side of the inner wall of the sampling barrel 1 is provided with an elastic telescopic block 28, and the top of the elastic telescopic block 28 is fixedly connected to a second spring 29. The auxiliary component 5 includes an electric telescopic rod 51, which is fixedly connected to the top of the sampling barrel 1, and the bottom of the electric telescopic rod 51 is fixedly connected to a piston 52, and the bottom of the piston 52 is fixedly connected to a first blocking plate 53, and the bottom of the first blocking plate 53 is fixedly connected to a trigger plate 54. The front of the inner wall of the sampling barrel 1 is hinged with a second blocking plate 55. The combination of the elastic telescopic block 28 and the electric telescopic rod 51 makes the device adjustable and multifunctional, and can be flexibly adjusted according to different needs and water sample collection conditions.The electric telescopic rod 51 not only improves the level of automation, but also makes the operation easier and more stable. At the same time, the arrangement of the piston 52, the first blocking plate 53 and the trigger plate 54 can accurately control the flow and storage of water samples under specific circumstances.

[0025] When the above device is used, the electric telescopic rod 51 is started to drive the piston 52 to rise, and the piston 52 drives the first blocking plate 53 to rise. The first blocking plate 53 gradually rises to absorb water of the first depth. At the same time, the electric telescopic rod 51 drives the connecting rod 6 to rise, and the connecting rod 6 drives the first permanent magnet 23 to magnetically connect with the first magnet 24. When the connecting rod 6 continues to rise, the first permanent magnet 23 drives the first magnet 24 to rotate, and the first magnet 24 drives the first rotating rod 25 to rotate. At the same time, the first The permanent magnet 23 slides on the inner wall of the chute plate 21, and the first permanent magnet 23 slides to the back, squeezing the first spring 22. During the rotation, the ratchet 26 and the pawl 27 are self-locking. The first rotating rod 25 drives the first circular gear 210 to rotate. The first circular gear 210 drives the first rack and the second conductive magnet 211 to move to the back. The second conductive magnet 211 drives the second permanent magnet 212 to move to the back, compressing the third spring 214, sampling the water at the first depth. When the connecting rod 6 continues to rise, it will make The first permanent magnet 23 is separated from the first conductive magnet 24, and the first spring 22 drives the first permanent magnet 23 to reset. The connecting rod 6 rises and squeezes the elastic telescopic block 28. When it fully rises to the top of the second permanent magnet 212, it falls again. Since the inclination angle of the top of the elastic telescopic block 28 is small, the elastic telescopic block 28 can be driven to fall. The elastic telescopic block 28 squeezes the pawl 27, so that the pawl 27 no longer limits the ratchet 26. The third spring 214 drives the first rack and the second conductive magnet 211 to reset to the front. The second conductive magnet 211 is reset to the front. The magnet 211 drives the second permanent magnet 212 to reset, the first rack and the second permanent magnet 212 drive the first circular gear 210 to rotate, and the first circular gear 210 drives the first rotating rod 25 and the first magnet 24 to reset. When the piston 52 continues to rise, it drives the first blocking plate 53 to seal the bottom of the sampling barrel 1, and the water at the first depth is not sampled. After sealing, the second blocking plate 55 is squeezed open by the trigger plate 54, and the second blocking plate 55 rotates counterclockwise with the hinge point as the center to open, and the water source at the second depth is sampled.

[0026] Example 2, see Figures 1-6On the basis of the first embodiment, the adding device 3 includes a first rotating block 31, which is fixedly connected to the outer wall of the first rotating rod 25. A vertical plate 32 is fixedly connected to the top of the storage box 213. A screw rod 33 is rotatably connected to the right side of the vertical plate 32 through a bearing. The screw rod 33 movably passes through the vertical plate 32 and extends to the left. The extended end is fixedly connected to a second rotating block 34. A sleeve 37 is slidably connected to the outer wall of the screw rod 33. A baffle 36 is fixedly connected to the right side of the sleeve 37 through the first rotating block 31. The cooperation of the second rotating block 34 and the screw rod 33 ensures that the addition process of boric acid can be carried out accurately and evenly. The combination of the first rotating block 31, the second rotating block 34 and the screw rod 33 improves the accuracy and efficiency of the additive operation. By providing the baffle 36 and the sleeve 37, the amount of additive and the mixing time can be effectively controlled to avoid excess or deficiency. A boric acid cartridge 35 is fixedly attached to the top of the storage box 213. A baffle 36 is slidably connected to the inner wall of the boric acid cartridge 35. A sealing gasket is provided at the connection between the baffle 36 and the boric acid cartridge 35. The boric acid cartridge 35 and the baffle 36 are designed and used in conjunction to ensure a tight seal and leak-proof function during the boric acid addition process, preventing chemical spillage and contamination of the equipment or the external environment. Furthermore, the provision of the sealing gasket ensures more precise chemical addition, improving the safety and stability of the device.

[0027] When the above-mentioned device is in use, the first rotating rod 25 drives the first rotating block 31 to rotate, and the first rotating block 31 drives the second rotating block 34 after rotating ninety degrees, so as to achieve the effect of delayed driving. The second rotating block 34 drives the screw rod 33 to rotate, and the screw rod 33 drives the sleeve 37 to rotate. The sleeve 37 drives the baffle 36 to move to the left, so that the boric acid on the top of the baffle 36 falls into the storage box 213.

[0028] Example 3, see Figure 4-Figure 7 On the basis of Example 1, the rotating device 4 includes a connecting plate 41, which is fixedly connected to the top of the storage box 213. The front of the storage box 213 is rotatably connected to a second rotating rod 42 via a bearing. The outer wall of the second rotating rod 42 is fixedly connected to a second circular gear 44. The front of the baffle 36 is fixedly connected to a second rack 45. The rotating device 4 provides stable rotational power through the interaction between the second rotating rod 42 and the second circular gear 44, making the process of mixing the water sample and boric acid more efficient. The engagement of the second circular gear 44 and the second rack 45 provides precise control, and the rotation speed or force can be adjusted as needed. The second circular gear 44 and the second rack 45 are meshed with each other, and a knocking block 43 is fixedly provided on the outer wall of the second rotating rod 42. The design of the knocking block 43 effectively increases the power of the rotating device 4, ensuring the thoroughness and uniformity of the mixing process. The vibration effect of the knocking block 43 on the water sample and boric acid helps to achieve dissolution or reaction more quickly and evenly.

[0029] When the above-mentioned device is in use, the baffle 36 moves to the left, and the baffle 36 drives the second rack 45 to move to the left. The second rack 45 drives the second circular gear 44 to rotate, and the second circular gear 44 drives the second rotating rod 42 to rotate. The second rotating rod 42 drives the knocking block 43 to knock on the top of the storage box 213 to produce a vibration effect, so that the water sample is mixed with boric acid, thereby improving the effect of subsequent detection.

[0030] When the above-mentioned device is used in a specific manner, the above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solution and inventive concept of the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. An integrated device for extracting and preserving water samples for water environment monitoring, comprising a sampling barrel (1), wherein the top of the sampling barrel (1) is fixedly connected to an auxiliary component (5), and the outer wall of the auxiliary component (5) is equipped with a connecting rod (6); It is characterized by: The side of the connecting rod (6) is equipped with a slide plate (21), the inner wall of the slide plate (21) is slidably connected to the first magnetic coupling assembly, the inner wall of the slide plate (21) is equipped with a first spring (22), the side of the inner wall of the sampling barrel (1) is equipped with a first rotating rod (25), the outer wall of the first rotating rod (25) is fixedly sleeved with a ratchet (26), the inner wall of the sampling barrel (1) is hinged with a pawl (27), the outer wall of the first rotating rod (25) is equipped with a first circular gear (210), and the sampling barrel (1) is provided with a plurality of rotating rods (25). The barrel (1) is equipped with a storage box (213) on the side, the storage box (213) is equipped with a second magnetic coupling assembly on the top, the second magnetic coupling assembly is fixedly connected to the top of the first rack, the back of the first rack is equipped with a third spring (214), the first circular gear (210) and the first rack are meshed with each other, the sampling barrel (1) is equipped with an adding device (3) for adding boric acid, and the sampling barrel (1) is equipped with a rotating device (4) for oscillating boric acid and water samples on the side.

2. The integrated device for extracting and storing water samples for water environment monitoring according to claim 1, characterized in that: The first magnetic coupler assembly includes a first permanent magnet (23), the first permanent magnet (23) is slidably connected to the inner wall of the slide plate (21), and the first rotating rod (25) is equipped with a first magnetic conductor (24) on the side, and the first permanent magnet (23) is magnetically connected to the first magnetic conductor (24).

3. The integrated device for extracting and storing water samples for water environment monitoring according to claim 1, characterized in that: The second magnetic coupler assembly includes a second permanent magnet (212), the second permanent magnet (212) is slidably connected to the bottom of the inner wall of the storage box (213), the top of the storage box (213) is slidably connected to a second magnetic conductor (211), the second magnetic conductor (211) is fixedly connected to the bottom of the first rack, and the second permanent magnet (212) is magnetically connected to the second magnetic conductor (211).

4. The integrated device for extracting and storing water samples for water environment monitoring according to claim 1, characterized in that: The sliding connection frame on the side of the inner wall of the sampling barrel (1) is provided with an elastic telescopic block (28), and the top of the elastic telescopic block (28) is fixedly connected to a second spring (29). The auxiliary component (5) includes an electric telescopic rod (51), and the electric telescopic rod (51) is fixedly connected to the top of the sampling barrel (1). The bottom of the electric telescopic rod (51) is fixedly connected to a piston (52), and the bottom of the piston (52) is fixedly connected to a first blocking plate (53), and the bottom of the first blocking plate (53) is fixedly connected to a trigger plate (54). The front of the inner wall of the sampling barrel (1) is hinged with a second blocking plate (55).

5. The integrated device for extracting and storing water samples for water environment monitoring according to claim 1, characterized in that: The adding device (3) comprises a first rotating block (31), the first rotating block (31) being fixedly connected to the outer wall of the first rotating rod (25), a vertical plate (32) being fixedly connected to the top of the storage box (213), a screw rod (33) being rotatably connected to the right side of the vertical plate (32) via a bearing, the screw rod (33) being movably passed through the vertical plate (32) and extending to the left side, and a second rotating block (34) being fixedly connected to the extended end, a sleeve (37) being slidably connected to the outer wall of the screw rod (33), and a baffle (36) being fixedly connected to the right side of the sleeve (37).

6. The integrated device for extracting and storing water samples for water environment monitoring according to claim 5, characterized in that: The top of the storage box (213) is fixedly connected to a boric acid box (35), the baffle (36) is slidably connected to the inner wall of the boric acid box (35), and a sealing gasket is provided at the connection between the baffle (36) and the boric acid box (35).

7. The integrated device for extracting and storing water samples for water environment monitoring according to claim 6, characterized in that: The rotating device (4) comprises a connecting plate (41), the connecting plate (41) being fixedly connected to the top of the storage box (213), the front of the storage box (213) being rotatably connected to a second rotating rod (42) via a bearing, the outer wall of the second rotating rod (42) being fixedly connected to a second circular gear (44), and the front of the baffle (36) being fixedly connected to a second rack (45).

8. The integrated device for extracting and storing water samples for water environment monitoring according to claim 7, characterized in that: The second circular gear (44) and the second rack (45) are meshed with each other, and a knocking block (43) is fixedly sleeved on the outer wall of the second rotating rod (42).

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