Multistage impact sampler

Abstract

The invention relates to the technical field of cascade impactors, and discloses a multi-stage impact sampler which comprises an outer shell and a sampling mechanism arranged in the outer shell, the sampling mechanism comprises an impact seat, a middle plate located above the impact seat and an upper cover seat located above the middle plate, a plurality of impact grooves are formed in the upper surface of the impact seat, and the upper cover seat is arranged in the middle plate. An installation groove is formed in the upper surface of the middle plate, an installation hole is formed in the groove bottom of the installation groove in a penetrating mode, the upper end of each impact disc is open and provided with an external step, the lower end of each impact disc is closed and provided with a plurality of holes in an array mode, and the external steps are arranged in the installation grooves in a sleeved mode; a second spring is arranged between the external step and the groove bottom of the mounting groove, the closed end of the impact disc is located in the impact groove, the sampling mechanism further comprises a plurality of vibration assemblies, the vibration assemblies are used for driving the impact disc to vibrate, and the number of the vibration assemblies is multiple.

Description

Technical Field

[0001] This invention relates to the field of pharmaceutical formulation technology, specifically to the field of cascade impactor technology, and particularly to a multi-stage impactor sampler. Background Technology

[0002] Multistage impactor samplers, also known as cascaded impactors, work on the principle of inertial collision. Specifically, airflow carrying drug particles (powder or aerosol) passes through multiple impactor discs (or impact plates) within the device at a certain pressure. The aperture of each impactor disc gradually decreases. When the airflow passes through, larger particles cannot follow the airflow due to inertia and will collide with and deposit on the current stage's collection medium impactor disc. Smaller particles, on the other hand, pass through the current stage with the airflow and enter the next stage's even smaller impactor disc. This process is repeated until the finest particles may pass through all the impactor discs and be completely captured by the final filter membrane.

[0003] Furthermore, refer to Figure 1 and Figure 2 Airflow draws drug particles through input component 3 into impactor 1. Impactor 1 has several holes, each containing an impact plate 5. Adjacent holes are connected by a connecting channel between the shell cover 2 and impactor 1. Therefore, airflow passes sequentially through the impact plates 5, trapping particles on their corresponding plates. Impactor 1 also has a negative pressure nozzle 4, connected to a negative pressure pump or exhaust fan to draw airflow away. The negative pressure nozzle 4 connects to the hole containing the last impact plate 5. Furthermore, to ensure sealing, a sealing ring 6 is placed between the shell cover 2 and impactor 1, surrounding the holes.

[0004] Existing technologies have some shortcomings. For example, the principle of particle capture by the impactor disc is similar to that of filtration. Larger particles cannot pass through the holes on the impactor disc, while smaller particles can. Particle capture is achieved by coordinating with the airflow direction. Therefore, during the particle capture process, there is a possibility that some captured particles are located at the holes of the impactor disc, resulting in some smaller particles not being able to pass through the holes, which affects the accuracy of the final particle size distribution analysis results.

[0005] Based on the above, the present invention proposes a multi-stage impact sampler. Summary of the Invention

[0006] To address the problems mentioned in the background above, the present invention provides a multi-stage impact sampler.

[0007] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows.

[0008] A multi-stage impact sampler includes an outer shell and a sampling mechanism disposed within the outer shell. The sampling mechanism includes an impact seat, an intermediate plate located above the impact seat, and an upper cover seat located above the intermediate plate.

[0009] The upper surface of the impact seat is provided with several impact grooves, and each impact groove contains an impact disk;

[0010] The upper surface of the middle plate is provided with a mounting groove, and the bottom of the mounting groove is provided with a mounting hole. The upper end of the impact plate is open and provided with an external step, and the lower end is closed and has several holes arranged in an array. The external step is fitted into the mounting groove, and a spring is provided between the external step and the bottom of the mounting groove. The closed end of the impact plate is located in the impact groove.

[0011] The sampling mechanism also includes a vibration component, which is used to drive the impact disk to vibrate. Multiple vibration components are provided.

[0012] As a further improvement and optimization of the present invention, the closed end of the impact disk is provided with a vertically arranged connecting shaft facing upward;

[0013] The vibration assembly includes an electromagnetic vibrator disposed on the upper surface of the upper cover. The electromagnetic vibrator includes an electromagnet, an armature located inside the electromagnet, and a spring located above the armature. The upper end of the connecting shaft passes through a clearance hole disposed on the upper cover and is located inside the electromagnet, and contacts the bottom of the armature.

[0014] As a further improvement and optimization of the present invention, when the vibration component drives the corresponding impact disk to vibrate, the direction and magnitude of the vibration displacement of all impact disks are the same.

[0015] As a further improvement and optimization of the present invention, the upper surface of the impact seat is provided with a connecting channel, one opening of the connecting channel is located on the upper surface of the impact seat and the other opening is located at the bottom of the impact groove, and a number of connecting channels are provided accordingly.

[0016] The lower surface of the upper cover is provided with a connecting groove. Two adjacent impact grooves are named the left impact groove and the right impact groove, respectively. The upper opening of the connecting channel that connects to the left impact groove and the groove opening of the right impact groove are connected through the connecting groove.

[0017] As a further improvement and optimization of the present invention, the airflow flows sequentially in several impact grooves. The two impact grooves located at both ends of the airflow direction are the first impact groove and the tail impact groove, respectively. The airflow initially flows into the first impact groove and eventually leaves from the tail impact groove.

[0018] The intermediate plate is provided with an intermediate hole that communicates with the first impact groove;

[0019] The upper opening of the connecting channel that connects to the tail impact groove is blocked by the intermediate plate, and the side of the impact seat is provided with a negative pressure connector that connects to this connecting channel.

[0020] As a further improvement and optimization of the present invention, the upper cover is provided with a top hole that communicates with the middle hole, an input component is provided at the upper opening of the top hole, and a sealing ring is provided between the upper opening of the middle hole and the lower opening of the top hole.

[0021] As a further improvement and optimization of the present invention, the sampling mechanism also includes an opening and closing component, which is used to move the middle plate and the upper cover in the vertical direction, thereby closing or opening the impact seat, the middle plate and the upper cover.

[0022] As a further improvement and optimization of the present invention, the opening and closing assembly includes a side bracket provided on the side of the impact seat, a guide post arranged vertically on the side bracket, a sleeve hole provided on the middle plate and the upper cover seat, and the guide post is sleeved through the sleeve hole. A spring is also sleeved on the outside of the guide post, and two springs are provided and located on the upper and lower sides of the middle plate respectively.

[0023] The side support is also equipped with vertically arranged columns, and vertically arranged linear rails are installed on the columns. Connecting seats are slidably installed on the linear rails, and the connecting seats are hinged to the upper cover seat.

[0024] The opening and closing assembly also includes a pressing component for pressing the upper cover seat downwards.

[0025] As a further improvement and optimization of the present invention, the pressing component includes a vertically arranged threaded shaft, a slide is threaded on the threaded shaft, the slide and the side bracket form a sliding connection in the vertical direction, a cantilever is slidably arranged on the slide, and a pressing seat is provided at the suspension end of the cantilever.

[0026] A magnet is installed on the cantilever. Initially, the magnetic attraction between the magnet and the slide block keeps the cantilever's suspension end directly above the upper cover.

[0027] As a further improvement and optimization of the present invention, the opening and closing assembly also includes a transmission shaft, one end of which is provided with a knob and the other end is connected to a threaded shaft for power connection.

[0028] The end of knob one is provided with a threaded hole, which extends through knob one and the shaft length of the transmission shaft. A screw is provided in the threaded hole, one end of which is connected to a screw hole provided on the side bracket, and the other end is provided with knob two.

[0029] Compared with the prior art, the beneficial effects of this invention are as follows:

[0030] 1. In the process of particle classification and sampling, this solution uses a vibration component to drive the impact disk to vibrate vertically. Therefore, it can prevent particles from clogging the holes of the impact disk, allowing smaller particles to pass through the impact disk smoothly without being captured. This solves the problem mentioned in the background technology that during the particle capture process, some captured particles are located at the holes of the impact disk, causing some smaller particles to be unable to pass through the holes, thus affecting the accuracy of the final particle size distribution analysis results.

[0031] 2. Furthermore, all vibration components are connected in series, meaning that when all impact disks vibrate, the direction and magnitude of the vibration displacement are synchronized. The technical advantage is that if they are not synchronized, there will be a negative or positive pressure in the area between two adjacent impact disks along the airflow direction. Negative pressure creates a suction force, which can easily allow particles that would otherwise not pass through the impact disk orifices to pass through under pressure. Positive pressure creates a flow obstruction, preventing particles from passing through the impact disk orifices. In either case, it will affect the accuracy of the final particle capture, thus affecting the accuracy of the final particle size distribution analysis results. In contrast, in this scheme, since the direction and magnitude of the vibration displacement of all impact disks are synchronized, this problem does not exist. Attached Figure Description

[0032] Figure 1 Schematic diagram of existing technology Figure 1 ;

[0033] Figure 2 Schematic diagram of existing technology Figure 2 ;

[0034] Figure 3 This is a schematic diagram of the structure of the present invention;

[0035] Figure 4 A schematic diagram of the sampling mechanism when closed;

[0036] Figure 5 A schematic diagram of the sampling mechanism when open. Figure 1 ;

[0037] Figure 6 A schematic diagram of the sampling mechanism when open. Figure 2 ;

[0038] Figure 7 A schematic diagram of the sampling mechanism when open. Figure 3 ;

[0039] Figure 8 An exploded view of the transmission shaft and screw;

[0040] Figure 9This is a schematic diagram showing the connection between the input component and the intermediate board;

[0041] Figure 10 This is a partial cross-sectional view of the sampling mechanism;

[0042] Figure 11 This is a schematic diagram of the vibration assembly and the impact plate;

[0043] Figure 12 This is a partial sectional view of the vibration assembly and the coupling.

[0044] The labels in the attached diagram are:

[0045] 100. Outer shell; 200. Sampling mechanism; 201. Impact seat; 2011. Impact groove; 202. Intermediate plate; 2021. Sealing ring; 203. Top cover; 2031. Connecting groove; 204. Input component; 205. Negative pressure nozzle; 206. Opening and closing component; 2061. Threaded shaft; 2062. Slide; 2063. Cantilever; 2064. Pressing seat; 2065. Magnet; 2066. Transmission shaft; 2067. Knob 1; 2068. Screw; 2069. Knob 2; 207. Vibration component; 2071. Outer shell; 2072. Electromagnet; 2073. Armature; 2074. Spring 3; 208. Impact plate; 2081. Connecting shaft; 2082. Spring 2; 209. Guide post; 210. Spring 1; 211. Connecting seat. Detailed Implementation

[0046] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0047] Reference Figures 1-12 A multi-stage impact sampler includes a housing 100 and a sampling mechanism 200 disposed within the housing 100. The housing 100 is open on the outward side and is provided with a cover.

[0048] The sampling mechanism 200 includes an impact seat 201, an intermediate plate 202 located above the impact seat 201, and an upper cover seat 203 located above the intermediate plate 202, wherein:

[0049] The upper surface of the impact seat 201 is provided with an impact groove 2011 and a connecting channel. One opening of the connecting channel is located on the upper surface of the impact seat 201, and the other opening is located at the bottom of the impact groove 2011. There are several impact grooves 2011 and several connecting channels are provided accordingly. Each impact groove 2011 contains an impact disk 208.

[0050] The upper surface of the intermediate plate 202 is provided with a mounting groove, and the bottom of the mounting groove is provided with a mounting hole. The upper end of the impact plate 208 is open and provided with an external step, and the lower end is closed and provided with a number of holes in an array. The external step is fitted into the mounting groove. When the sampling mechanism 200 is closed, the intermediate plate 202 and the impact seat 201 are tightly fitted together and the closed end of the impact plate 208 is located in the impact groove 2011. A spring 2082 is provided between the external step and the bottom of the mounting groove.

[0051] The lower surface of the upper cover 203 is provided with a connecting groove 2031. Two adjacent impact grooves 2011 are named the left impact groove and the right impact groove, respectively. The upper opening of the connecting channel connected to the left impact groove and the groove opening of the right impact groove are connected through the connecting groove 2031.

[0052] The airflow flows sequentially within several impact slots 2011. Two impact slots 2011 located at opposite ends of the airflow direction are the first impact slot and the last impact slot, respectively. The airflow initially flows into the first impact slot and eventually exits from the last impact slot. Wherein:

[0053] The intermediate plate 202 is provided with an intermediate hole that communicates with the first impact groove, and the upper cover 203 is provided with a top hole that communicates with the intermediate hole. An input component 204 is provided at the upper opening of the top hole, and a sealing ring 2021 is provided between the upper opening of the intermediate hole and the lower opening of the top hole to improve the sealing between the intermediate hole and the top hole when the intermediate plate 202 and the upper cover 203 are tightly fitted.

[0054] The upper opening of the connecting channel that connects to the tail impact groove is blocked by the intermediate plate 202. At the same time, the side of the impact seat 201 is provided with a negative pressure connector 205 that connects to this connecting channel. The negative pressure connector 205 is connected to a negative pressure device, such as a negative pressure pump or a fan.

[0055] Reference Figures 10-12 This solution also includes a vibration assembly 207, used to drive the impact disk 208 to vibrate. Multiple vibration assemblies 207 are provided, specifically:

[0056] The closed end of the impact disk 208 is provided with a vertically arranged connecting shaft 2081 facing upward;

[0057] The vibration assembly 207 includes an electromagnetic vibrator disposed on the upper surface of the upper cover 203. The electromagnetic vibrator is a technology that can be implemented in the prior art. It includes an electromagnet 2072, an armature 2073 located inside the electromagnet 2072, and a spring 2074 located above the armature 2073. When the sampling mechanism 200 is closed, the upper end of the connecting shaft 2081 passes through the clearance hole provided on the upper cover 203 and is located inside the electromagnet 2072, and contacts the bottom of the armature 2073. Therefore, the electromagnetic vibrator can drive the impact disk 208 to vibrate in the vertical direction.

[0058] Furthermore, all vibration components 207 are arranged in series, meaning that all vibration components 207 operate synchronously, so that when all impact discs 208 vibrate, the direction and magnitude of the vibration displacement are synchronous and consistent.

[0059] The technical advantage of this method is:

[0060] 1. In the process of particle classification and sampling, this solution uses a vibration component to drive the impact disk to vibrate vertically. Therefore, it can prevent particles from clogging the holes of the impact disk, allowing smaller particles to pass through the impact disk smoothly without being captured. This solves the problem mentioned in the background technology that during the particle capture process, some captured particles are located at the holes of the impact disk, causing some smaller particles to be unable to pass through the holes, thus affecting the accuracy of the final particle size distribution analysis results.

[0061] 2. Furthermore, all vibration components are connected in series, meaning that when all impact disks vibrate, the direction and magnitude of the vibration displacement are synchronized. The technical advantage is that if they are not synchronized, there will be a negative or positive pressure in the area between two adjacent impact disks along the airflow direction. Negative pressure creates a suction force, which can easily allow particles that would otherwise not pass through the impact disk orifices to pass through under pressure. Positive pressure creates a flow obstruction, preventing particles from passing through the impact disk orifices. In either case, it will affect the accuracy of the final particle capture, thus affecting the accuracy of the final particle size distribution analysis results. In contrast, in this scheme, since the direction and magnitude of the vibration displacement of all impact disks are synchronized, this problem does not exist.

[0062] Furthermore, the electromagnetic vibrator is provided with an outer casing 2071.

[0063] In a preferred embodiment, after particulate matter capture is completed, the sampling mechanism 200 needs to be opened to analyze the captured particulate matter. In the prior art, the impact seat and the shell cover are hinged. This connection method can easily cause excessive wear on the side of the sealing ring near the hinge shaft during the opening and closing of the sampling mechanism 200, affecting the service life of the sealing ring. To solve this problem, the opening and closing component 206 is provided to improve the opening and closing method of the sampling mechanism 200.

[0064] Specifically, refer to Figures 4-8 The opening and closing assembly 206 includes a side bracket disposed on the side of the impact seat 201, and a vertically arranged guide post 209 is disposed on the side bracket.

[0065] Both the intermediate plate 202 and the upper cover 203 are provided with sleeve holes, and are sleeved on the outside of the guide post 209 through the sleeve holes. A spring 210 is also sleeved on the outside of the guide post 209. There are two springs 210, which are located on the upper and lower sides of the intermediate plate 202 respectively.

[0066] The side support is also provided with vertically arranged columns, and vertically arranged rails are provided on the columns. Connecting seats 211 are slidably arranged on the rails. Connecting seats 211 and upper cover seats 203 are hingedly connected and the hinge axis formed is horizontally arranged.

[0067] The opening and closing assembly 206 also includes a pressing component for pressing the upper cover 203 downwards.

[0068] The pressing component includes a vertically arranged threaded shaft 2061, on which a slide 2062 is threaded. The slide 2062 and the side bracket form a sliding connection in the vertical direction. Therefore, when the threaded shaft 2061 rotates, it can drive the slide 2062 to move.

[0069] A cantilever 2063 is slidably provided on the slide 2062. The movement direction of the cantilever 2063 is arranged horizontally and perpendicular to the hinge axis. The suspension end of the cantilever 2063 is hinged to a pressing seat 2064, and the hinge axis formed is parallel to the hinge axis between the connecting seat 211 and the upper cover seat 203.

[0070] Furthermore, a magnet 2065 is provided on the cantilever 2063. Initially, the magnetic attraction between the magnet 2065 and the slide 2062 causes the suspension end of the cantilever 2063 to be located directly above the upper cover 203, that is, the pressing seat 2064 is located directly above the upper cover 203.

[0071] Furthermore, the opening and closing assembly 206 also includes a transmission shaft 2066. One end of the transmission shaft 2066 is provided with a knob 2067, and the other end is connected to the threaded shaft 2061. By turning the knob 2067, the transmission shaft 2066 can be driven to rotate, thereby driving the threaded shaft 2061 to rotate, causing the slide 2062 to move vertically.

[0072] Furthermore, the end of knob 2067 is provided with a threaded hole that extends through the length of knob 2067 and transmission shaft 2066. A screw 2068 is provided in the threaded hole. One end of screw 2068 is connected to a screw hole provided on the side bracket, and the other end is provided with knob 2069.

[0073] The working process of the opening and closing component 206:

[0074] By turning knob 2067, the threaded shaft 2061 is rotated, causing slide 2062 to move upward. Pressing seat 2064 gradually releases its pressure on upper cover 203. With the release of the elastic force of two springs 210, impact seat 201, intermediate plate 202, and upper cover 203 gradually separate. Figure 5 As shown, after the separation is complete, the sleeve hole on the upper cover 203 approaches the upper end of the guide post 209;

[0075] If you want to further increase the distance between the upper cover 203 and the middle plate 202 to facilitate the removal of the impact plate 208, then manually move the pressing seat 2064 backward to make it move away from the upper cover 203, and then move it upward first and then deflect the upper cover 203 backward.

[0076] To close the cover again, first deflect it forward and then move the upper cover 203 downward so that the sleeve hole on the upper cover 203 is back on the guide post 209. Move the pressing seat 2064 forward so that it is directly above the upper cover 203. Then, rotate the knob 2067 in the opposite direction to move the pressing seat 2064 downward. This will allow the impact seat 201, the middle plate 202 and the upper cover 203 to gradually close, and the spring 210 will be gradually compressed.

[0077] Furthermore, the rotation of the transmission shaft 2066 can be restricted by turning knob 2069. The advantage is that without screw 2068, the threaded shaft 2061 will rotate slightly under the reaction force of prolonged pressing, which would affect the sealing performance of the sampling mechanism 200.

[0078] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A multi-stage impact sampler, comprising a housing (100) and a sampling mechanism (200) disposed within the housing (100), characterized in that, The sampling mechanism (200) includes an impact seat (201), an intermediate plate (202) located above the impact seat (201), and an upper cover seat (203) located above the intermediate plate (202); The upper surface of the impact seat (201) is provided with several impact grooves (2011), and each impact groove (2011) contains an impact disk (208); The upper surface of the intermediate plate (202) is provided with a mounting groove, and the bottom of the mounting groove is provided with a mounting hole. The upper end of the impact plate (208) is open and provided with an external step, and the lower end is closed and provided with a number of holes in an array. The external step is fitted into the mounting groove, and a spring (2082) is provided between the external step and the bottom of the mounting groove. The closed end of the impact plate (208) is located in the impact groove (2011). The sampling mechanism (200) also includes a vibration component (207), which is used to drive the impact disk (208) to vibrate. Multiple vibration components (207) are provided.

2. The multi-stage impact sampler according to claim 1, characterized in that, The closed end of the impact disk (208) is provided with a vertically arranged connecting shaft (2081) facing upward; The vibration assembly (207) includes an electromagnetic vibrator disposed on the upper surface of the upper cover (203). The electromagnetic vibrator includes an electromagnet (2072), an armature (2073) located inside the electromagnet (2072), and a spring (2074) located above the armature (2073). The upper end of the connecting shaft (2081) passes through the clearance hole disposed on the upper cover (203) and is located inside the electromagnet (2072), and contacts the bottom of the armature (2073).

3. A multi-stage impact sampler according to claim 2, characterized in that, When the vibration component (207) drives the corresponding impact disk (208) to vibrate, the direction and magnitude of the vibration displacement of all impact disks (208) are the same.

4. A multi-stage impact sampler according to claim 1 or 3, characterized in that, The upper surface of the impact seat (201) is provided with a connection channel. One opening of the connection channel is located on the upper surface of the impact seat (201), and the other opening is located at the bottom of the impact groove (2011). Several connection channels are provided accordingly. The lower surface of the upper cover (203) is provided with a connecting groove (2031). Two adjacent impact grooves (2011) are named the left impact groove and the right impact groove, respectively. The upper opening of the connecting channel connected to the left impact groove and the groove opening of the right impact groove are connected through the connecting groove (2031).

5. A multi-stage impact sampler according to claim 4, characterized in that, The airflow flows sequentially in several impact slots (2011). The two impact slots (2011) located at both ends of the airflow direction are the first impact slot and the last impact slot, respectively. The airflow initially flows into the first impact slot and eventually leaves from the last impact slot. The intermediate plate (202) is provided with an intermediate hole that communicates with the first impact groove; The upper opening of the connecting channel that communicates with the tail impact groove is blocked by the intermediate plate (202), and the side of the impact seat (201) is provided with a negative pressure connector (205) that communicates with this connecting channel.

6. A multi-stage impact sampler according to claim 5, characterized in that, The upper cover (203) is provided with a top hole that communicates with the middle hole. An input component (204) is provided at the upper opening of the top hole. A sealing ring (2021) is provided between the upper opening of the middle hole and the lower opening of the top hole.

7. A multi-stage impact sampler according to claim 1 or 6, characterized in that, The sampling mechanism (200) also includes an opening and closing assembly (206) for moving the intermediate plate (202) and the upper cover (203) in the vertical direction, thereby closing or opening the impact seat (201), the intermediate plate (202) and the upper cover (203).

8. A multi-stage impact sampler according to claim 7, characterized in that, The opening and closing assembly (206) includes a side bracket provided on the side of the impact seat (201), a vertically arranged guide post (209) provided on the side bracket, and sleeve holes provided on the middle plate (202) and the upper cover seat (203), which are sleeved on the outside of the guide post (209) through the sleeve holes. A spring (210) is also sleeved on the outside of the guide post (209). There are two springs (210) and they are located on the upper and lower sides of the middle plate (202) respectively. The side support is also provided with vertically arranged columns, and vertically arranged rails are provided on the columns. A connecting seat (211) is slidably arranged on the rails, and the connecting seat (211) is hinged to the upper cover seat (203). The opening and closing assembly (206) also includes a pressing component for pressing the upper cover (203) downwards.

9. A multi-stage impact sampler according to claim 8, characterized in that, The pressing component includes a vertically arranged threaded shaft (2061), a slide (2062) threaded on the threaded shaft (2061), the slide (2062) and the side bracket forming a vertical sliding connection, a cantilever (2063) slidably arranged on the slide (2062), and a pressing seat (2064) provided at the suspension end of the cantilever (2063); A magnet (2065) is provided on the cantilever (2063). Initially, the magnetic attraction between the magnet (2065) and the slide (2062) makes the suspension end of the cantilever (2063) located directly above the upper cover (203).

10. A multi-stage impact sampler according to claim 9, characterized in that, The opening and closing assembly (206) also includes a transmission shaft (2066), one end of which is provided with a knob (2067), and the other end is connected to the threaded shaft (2061) for power connection; The end of knob one (2067) is provided with a threaded hole, which extends through the length of knob one (2067) and the shaft of transmission shaft (2066). A screw (2068) is provided in the threaded hole. One end of the screw (2068) is connected to a screw hole provided on the side bracket, and the other end is provided with knob two (2069).

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