Multi-stage sampling device based on environment monitoring equipment

Abstract

The invention discloses a multi-stage sampling device based on environmental monitoring equipment, and relates to the technical field of multi-stage sampling, the outer wall of a sampling rod is fixedly connected with the inner ring of a limiting disc, the upper side of the outer wall of the sampling rod is connected with an upper limiting disc, and the outer wall of the sampling rod is provided with a sampling port and a pipe taking port; the inner wall of the sampling rod is in sliding connection with the outer wall of the sampling pipe, and the outer wall of the sampling pipe is provided with a sampling groove. The device has the advantages that the pipe taking opening is hidden, impurities are prevented from entering the pipe taking opening, the sampling convenience is improved, and the sampling efficiency is improved; the multiple sampling pipes are used for sampling soil of different layers, the purpose of multi-stage sampling is achieved, the annular cover can be used for sealing the sampling pipes, the situation that soil samples fall off when the sampling pipes are taken out is avoided, the annular through opening is used for moving the upper end of the annular cover to the position above the sampling pipes, and the convenience of position control over the annular cover is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multi-stage sampling, in particular to a multi-stage sampling device based on environmental monitoring equipment. BACKGROUND

[0002] Environmental monitoring refers to the activities of environmental monitoring institutions to monitor and measure environmental quality, environmental monitoring is to monitor and measure the indicators reflecting environmental quality to determine the environmental pollution situation and the level of environmental quality, sampling, also known as sampling, is a statistical analysis method of extracting a part of the units from the total units of the research object for investigation and analysis, and using to infer the overall quantitative characteristics, this process seems simple, but in fact contains rigorous scientific logic and method, the purpose is to obtain information about the overall through the study of part of the sample, so as to avoid the huge consumption of time, manpower and material resources caused by the comprehensive investigation of the huge overall; The common multi-stage sampling device is inconvenient to hide the position of the sampling pipe when in use, and foreign matters are easy to enter the inside of the sampling device, affecting the connection effect between the sampling pipes, meanwhile, when multi-stage sampling is carried out, it is inconvenient to take out different levels of samples in batches, affecting the sampling efficiency, meanwhile, the soil samples are easy to be loose when taken out, resulting in low completeness of the soil samples, therefore, we propose a multi-stage sampling device based on environmental monitoring equipment. SUMMARY

[0003] The present application relates to the technical field of multi-stage sampling, in particular to a multi-stage sampling device based on environmental monitoring equipment.

[0004] In order to achieve the above object, the present application provides the following technical scheme: a multistage sampling device based on an environmental monitoring device, comprising a sampling device main body, the sampling device main body comprising a lower rotary box and a multistage sampling mechanism connected to the lower end of the lower rotary box, the multistage sampling mechanism comprising a connecting cover, an inner connecting disc, a limiting disc, a sampling rod, a sampling tube, an annular cover and an upper cover, the lower end of the lower rotary box is screw connected with the upper end of the connecting cover, the inner side of the connecting cover is connected with the outer wall of the inner connecting disc, the inner wall of the inner connecting disc is slidingly connected with the outer wall of the sampling rod, the outer wall of the sampling rod is fixedly connected with the inner ring of the limiting disc, the outer wall of the sampling rod is connected with an upper limiting disc on the upper side, and the inner connecting disc is located between the limiting disc and the upper limiting disc, the outer wall of the sampling rod is provided with a sampling port and a tube port, the tube port is vertically located between the region of the upper surface of the limiting disc and the lower surface of the upper limiting disc, the sampling port is located on the lower side of the limiting disc, the inner wall of the sampling rod is slidingly connected with the outer wall of the sampling tube, the outer wall of the sampling tube is provided with a sampling groove, the side wall of the sampling groove is provided with an annular groove, the inner wall of the annular groove is slidingly connected with the outer wall of the annular cover, the upper end of the sampling tube is connected with the lower end of the upper cover, the upper end of the upper cover is provided with an annular through port, and the upper end of the annular cover extends to the outer side of the sampling tube through the annular through port, the upper end of the sampling tube is connected with a connecting mechanism, and the upper end of the sampling rod is connected with a driving mechanism.

[0005] As a further scheme of the present application: the driving mechanism comprises a driving gear, a power motor, a lead screw, a transmission gear and a lifting disc, the upper side of the outer wall of the limiting disc is connected with the outer wall of the power motor, and the output end of the power motor is connected with the inner ring of the driving gear.

[0006] As a further scheme of the present application: the inner wall of the sampling rod is provided with an annular groove, the lower wall of the annular groove is rotationally connected with the lower end of the lead screw, the upper end of the lead screw extends to the outer side of the sampling rod, the upper side of the outer wall of the lead screw is connected with the inner ring of the transmission gear, and the transmission gear is engaged with the driving gear.

[0007] As a further scheme of the present application: the connecting mechanism comprises a connecting protrusion, a lower sealing plate and a screw, the upper end of the sampling tube is connected with the lower end of the connecting protrusion, the lower end of the sampling tube is connected with the upper end of the lower sealing plate, the lower end of the lower sealing plate is provided with a connecting groove, the connecting groove is matched with the connecting protrusion, and the upper end of the connecting protrusion is connected with a connecting mechanism.

[0008] As a further scheme of the present application: the outer wall of the lower sealing plate is provided with two side grooves, the side of the two side grooves close to each other is provided with a threaded hole, the inner wall of the two threaded holes is screw connected with the outer wall of the screw, and the two screws extend to the inside of the connecting groove, the outer wall of the connecting protrusion is provided with a recess, and the screw is screwed into the recess of the connecting groove, so as to be fastened.

[0009] As a further scheme of the present application: the connecting mechanism comprises a connecting rod, a pressing plate and a top block, the upper end of the connecting block is provided with a lifting hole, the inner wall of the lifting hole is in sliding connection with the outer wall of the connecting rod, and the lower end of the connecting rod extends into the sampling groove.

[0010] As a further scheme of the present application: the upper end of the connecting rod is provided with a connecting hole, the inner wall of the connecting hole is provided with an internal thread, the lower end of the connecting rod is connected with the upper end of the pressing plate, and the outer wall of the pressing plate is provided with a block-avoiding hole.

[0011] As a further scheme of the present application: the upper end of the inner wall of the sampling groove is connected with the top block, and the top block is matched with the block-avoiding hole, the lower end of the pressing plate is provided with an annular through groove, and the upper side of the pressing plate is connected with a lower elastic mechanism.

[0012] As a further scheme of the present application: the lower elastic mechanism comprises a lower elastic disc and a lower elastic spring, the upper end of the lower elastic spring is connected with the top wall of the sampling groove, the lower end of the lower elastic spring is connected with the lower elastic disc, the lower end of the lower elastic spring is connected with the upper end of the lower elastic disc, and the lower elastic disc is matched with the pressing plate.

[0013] Compared with the prior art, the present application has the following advantages: 1. The sampling rod can be inserted into the soil by rotating through the lower rotating box, the sampling tube port can be hidden while the sampling rod is connected with the lower rotating box through the connecting cover and the inner connecting disc, foreign matters are prevented from entering the sampling tube port, the sampling tube port can be exposed when the sampling tube is taken out from the inside of the sampling tube port, the convenience of sampling is increased, different levels of soil can be sampled through the plurality of sampling tubes, the purpose of multi-level sampling is achieved, the sampling tube can be sealed through the annular cover, the soil sample is prevented from falling off when the sampling tube is taken out, the annular through port is used to move the upper end of the annular cover to the upper side of the sampling tube, and the convenience of position control of the annular cover is improved. 2. The rotation of the screw rod is powered by the power motor, the power is transmitted to the screw rod through the driving gear and the transmission gear, the lifting disc is used to push the sampling tube to ascend and descend, the replacement between different sampling tubes is achieved, the abutment block and the abutment groove are matched with each other, the adjacent sampling tubes are embedded more tightly and stably, the screw is used to further reinforce the stability between the adjacent sampling tubes, the plurality of sampling tubes are synchronous, the plurality of sampling tubes can rotate synchronously, and the angles of the plurality of sampling tubes are conveniently controlled. 3、The utility model discloses through utilize connecting rod and connecting hole can with the equipment of external connection, can further control the position of lower pressing plate, utilize lower pressing plate can press down soil sample, make soil sample extrusion forming, avoid soil sample too loose, improve the integrity of soil sample when carrying, avoid hole for with top block intercoordination, make lower pressing plate more smooth when lifting, and top block is used for fixed position of lower pressing plate, and lower elastic disc and lower elastic spring are used for pressing down lower pressing plate, make lower pressing plate more stably stay in the top of top block, reduce the probability of falling into the sampling groove of lower pressing plate.

[0014] Other advantages, objects, and features of the present application will be better understood from the following detailed description when taken in conjunction with the drawings and the described embodiments, some of which can be practiced or carried out in various ways as can be learned from the description. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the whole three-dimensional schematic view in the embodiment of the application; Figure 2 It is the three-dimensional schematic view of sampling rod in the embodiment of the application; Figure 3 It is the three-dimensional schematic view of connecting cover in the embodiment of the application; Figure 4 It is the three-dimensional schematic view of limit disc in the embodiment of the application; Figure 5 It is Figure 4 It is the enlarged schematic view of A in the embodiment of the application; Figure 6 It is the three-dimensional schematic view of lead screw in the embodiment of the application; Figure 7 It is the three-dimensional schematic view of sampling tube in the embodiment of the application; Figure 8 It is the three-dimensional schematic view of annular cover in the embodiment of the application; Figure 9 It is the three-dimensional schematic view of lower sealing plate in the embodiment of the application; Figure 10 It is the three-dimensional schematic view of upper sealing cover in the embodiment of the application; Figure 11 It is the three-dimensional schematic view of lower elastic disc in the embodiment of the application; Figure 12 It is the three-dimensional schematic view of lower pressing plate in the embodiment of the application.

[0016] In the figure: 1, the main body of the sampling device; 11, the lower rotary box; 2, the multi-stage sampling mechanism; 201, the connecting cover; 202, the inner connecting disc; 203, the limiting disc; 204, the sampling rod; 205, the sampling port; 206, the sampling tube port; 207, the sampling tube; 208, the annular groove; 209, the annular cover; 210, the upper cover; 211, the annular through port; 3, the driving mechanism; 31, the driving gear; 32, the power motor; 33, the screw rod; 34, the annular groove; 35, the transmission gear; 36, the lifting disc; 4, the connecting mechanism; 41, the connecting protrusion; 42, the lower cover plate; 43, the connecting groove; 44, the screw; 45, the side groove; 5, the connecting mechanism; 51, the connecting rod; 52, the connecting hole; 53, the pressing plate; 54, the block hole; 55, the top block; 6, the lower spring mechanism; 61, the lower spring disc; 62, the lower spring. DETAILED DESCRIPTION

[0017] The specific embodiments of the present application will be further described below with reference to the drawings, and it should be noted that the description of these embodiments is used to help understand the present application, but does not constitute a limitation on the present application.

[0018] In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other. EMBODIMENT

[0019] The multi-stage sampling device based on the environmental monitoring equipment can be used in large farmland areas for soil pollution investigation. The farmland has experienced different degrees of pesticide, fertilizer use, and industrial wastewater irrigation, and the soil composition is complex. Researchers need to obtain soil samples at different depths to analyze the distribution of pollutants in the soil, the content change, and then evaluate the degree of soil pollution, and provide accurate data support for subsequent targeted soil remediation scheme; However, in actual operation, researchers find that the conventional soil sampling device has many problems. The ordinary sampling device can only collect soil samples at a single depth at a time. If samples at different depths are needed, the sampling device needs to be inserted and pulled out multiple times, which not only consumes time and effort, but also causes great damage to the soil structure, affecting the accuracy of the sample. In addition, the existing sampling device cannot effectively prevent foreign matter from mixing into the sample when the sample is taken out, which causes the sample to be contaminated, affects the reliability of the detection result, and makes it difficult for researchers to accurately judge the real situation of soil pollution. Therefore, in order to effectively solve the above problems, the present application provides a multi-stage sampling device based on an environmental monitoring equipment, as shown in the accompanying drawings Figures 1-12As shown, including sampling device body 1, sampling device body 1 includes the lower rotary box 11 and the lower end of the lower rotary box 11 is connected to the multi-stage sampling mechanism 2, the multi-stage sampling mechanism 2 includes the connecting cover 201, the inner connecting disc 202, the limiting disc 203, the sampling rod 204, the sampling tube 207, the annular cover 209 and the upper cover 210, the lower end of the lower rotary box 11 is screw connected with the upper end of the connecting cover 201, the inner side of the connecting cover 201 is connected with the outer wall of the inner connecting disc 202, the inner wall of the inner connecting disc 202 is slidingly connected with the outer wall of the sampling rod 204, the outer wall of the sampling rod 204 is fixedly connected with the inner ring of the limiting disc 203, the outer wall of the sampling rod 204 is connected with the upper limiting disc on the upper side, and the inner connecting disc 202 is located between the limiting disc 203 and the upper limiting disc, the outer wall of the sampling rod 204 is provided with the sampling port 205 and the sampling tube port 206, and the sampling tube port 206 is vertically located in the region between the upper surface of the limiting disc 203 and the lower surface of the upper limiting disc, the sampling port 205 is located on the lower side of the limiting disc 203, the inner wall of the sampling rod 204 is slidingly connected with the outer wall of the sampling tube 207, the outer wall of the sampling tube 207 is provided with a sampling groove, the sampling groove is used for accommodating the soil sample, and the sampling groove is sealed by cooperating with the annular cover 209 through the annular groove 208, the inner wall of the annular groove 208 is slidingly connected with the outer wall of the annular cover 209, the upper end of the sampling tube 207 is connected with the lower end of the upper cover 210, the upper end of the upper cover 210 is provided with the annular through port 211, and the upper end of the annular cover 209 extends to the outer side of the sampling tube 207 through the annular through port 211, the upper end of the sampling tube 207 is connected with the connecting mechanism 4, and the upper end of the sampling rod 204 is connected with the driving mechanism 3; Wherein the sampling tube 207 is provided with a plurality of sampling tubes 207, which are detachably connected together; Specifically, the lower rotary box 11 can make the sampling rod 204 inserted into the soil by rotating, the connecting cover 201 and the inner connecting disc 202 can make the sampling rod 204 connected with the lower rotary box 11 while hiding the sampling tube port 206, the sampling port 205 is used for transferring the soil into the sampling tube 207, and the sampling tube 207 is used for collecting the soil sample, when the sampling rod 204 is inserted into the soil at different levels, the multiple sampling tubes 207 can be used for sampling the soil at different levels, achieving the purpose of multi-stage sampling, the annular cover 209 can make the sampling tube 207 sealed, avoiding the soil sample falling off when the sampling tube 207 is taken out, and the annular through port 211 is used for moving the upper end of the annular cover 209 above the sampling tube 207, thereby facilitating the position control of the annular cover 209. Embodiment

[0020] The driving mechanism 3 includes the driving gear 31, the power motor 32, the lead screw 33, the transmission gear 35 and the lifting disc 36, the upper side of the outer wall of the limiting disc 203 is connected with the outer wall of the power motor 32, and the output end of the power motor 32 is connected with the inner ring of the driving gear 31; The inner wall of the sampling rod 204 is provided with a ring groove 34, the lower wall of the ring groove 34 is rotationally connected with the lower end of the lead screw 33, the upper end of the lead screw 33 extends to the outside of the sampling rod 204, the outer wall of the lead screw 33 is connected with the inner ring of the transmission gear 35 on the upper side, and the transmission gear 35 is engaged with the driving gear 31; The connection mechanism 5 includes a connecting rod 51, a pressing plate 53, and a top block 55, the upper end of the connection block 41 is provided with a lifting hole, the inner wall of the lifting hole is slidingly connected with the outer wall of the connecting rod 51, the lower end of the connecting rod 51 extends into the sampling groove; The outer wall of the lower sealing plate 42 is provided with two side grooves 45, the side close to each other of the two side grooves 45 is provided with a threaded hole, the inner wall of the two threaded holes is screw-connected with the outer wall of the screw 44, and the two screws 44 extend into the inside of the connection groove 43, the outer wall of the connection block 41 is provided with a recess hole, and the screw 44 is screwed into the recess hole in the connection groove 43, so as to be fastened; Specifically, the power motor 32 provides power for the rotation of the lead screw 33, the power is transmitted to the lead screw 33 through the driving gear 31 and the transmission gear 35, the lifting disc 36 is used to push the sampling tube 207 to ascend and descend, so as to realize the replacement between different sampling tubes 207, the connection block 41 and the connection groove 43 are used to cooperate with each other, so as to make the connection between the adjacent sampling tubes 207 more closely and stably, the screw 44 is used to further reinforce the stability between the adjacent sampling tubes 207, and at the same time, the plurality of sampling tubes 207 can have synchronism, so that the plurality of sampling tubes 207 can rotate synchronously. Embodiment

[0021] The connection mechanism 5 includes a connecting rod 51, a pressing plate 53, and a top block 55, the upper end of the connection block 41 is provided with a lifting hole, the inner wall of the lifting hole is slidingly connected with the outer wall of the connecting rod 51, the lower end of the connecting rod 51 extends into the sampling groove; The upper end of the connecting rod 51 is provided with a connecting hole 52, the inner wall of the connecting hole 52 is provided with an internal thread, the lower end of the connecting rod 51 is connected with the upper end of the pressing plate 53, and the outer wall of the pressing plate 53 is provided with an avoiding hole 54; The upper end of the sampling groove inner wall is connected with the top block 55, and the top block 55 cooperates with the avoiding hole 54, the lower end of the pressing plate 53 is provided with an annular through groove, and the upper side of the pressing plate 53 is connected with a lower elastic mechanism 6; The lower elastic mechanism 6 includes a lower elastic disc 61 and a lower elastic spring 62, the upper end of the lower elastic spring 62 is connected with the sampling groove top wall, the lower end is connected with the lower elastic disc 61, the lower end of the lower elastic spring 62 is connected with the upper end of the lower elastic disc 61, and the lower elastic disc 61 cooperates with the pressing plate 53; The connecting hole 52 of the connecting rod 51 cooperates with the external device, the external device is rod-shaped, and an outer thread is arranged at the lower end and cooperates with the inner thread. After use, the external device can be removed from the upper end of the connecting rod 51. Specifically, the connecting rod 51 and the connecting hole 52 can be connected with the external device, thereby further controlling the position of the lower pressing plate 53. The lower pressing plate 53 is used to press the soil sample, so that the soil sample is more shaped when taken out, avoiding the soil sample being too loose. The hole 54 is used to cooperate with the top block 55, so that the lower pressing plate 53 is more smooth when lifting. The top block 55 is used to fix the position of the lower pressing plate 53. The lower spring plate 61 and the lower spring 62 are used to press the lower pressing plate 53, so that the lower pressing plate 53 stays more stably above the top block 55, reducing the probability of the lower pressing plate 53 falling into the sampling groove.

[0022] Working principle: Firstly, the sampling rod 204 at the lower end of the lower rotary box 11 is placed at the position where sampling is needed, and then the lower rotary box 11 is started to drive the connection cover 201, the inner connection disc 202 and the sampling rod 204 to rotate, and at the same time, the lower rotary box 11 is pressed downward, the pressing force is transmitted to the sampling rod 204 through the limiting disc 203, and then the sampling rod 204 rotates downward to the soil, when moving to the layer where sampling is needed, the lower rotary box 11 and the connection cover 201 are pulled upward, at this time, the connection cover 201 moves upward along the sampling rod 204, so that the sampling pipe opening 206 is exposed, and the sampling tube 207 is manually rotated to rotate all the sampling tubes 207 by 180 degrees, so that the soil sample is stored in the sampling tube 207, and the power motor 32 is started, the power motor 32 drives the lead screw 33 to rotate through the driving gear 31 and the transmission gear 35, and the rotation of the lead screw 33 drives the lifting disc 36 to ascend and descend, so as to push the sampling tube 207 to move upward, when the sampling tube 207 moves to the inside of the sampling pipe opening 206, the annular cover 209 is rotated to seal the sampling groove, the angle of the sampling tube 207 is adjusted, and the screw 44 is removed from the recess hole, at this time, the sampling tube 207 can be taken out from the connecting block 41 on the lower sampling tube 207 and moved to the outside of the sampling rod 204 from the sampling pipe opening 206, when moving to the next layer where sampling is needed, the lower sampling tube 207 is rotated, the sampling groove of the sampling tube 207 cooperates with the sampling pipe opening 206, so that the soil sample of the current layer enters the sampling tube 207, and after the sampling tube 207 containing the soil sample is taken out, the connecting rod 51 is screwed into the connecting hole 52 of the connecting rod 51 by using the external equipment, at this time, the connecting rod 51 is rotated synchronously, the block hole 54 in the pressing plate 53 cooperates with the top block 55, then the connecting rod 51 is pressed downward, the pressing plate 53 moves to the lower side of the top block 55, at this time, the connecting rod 51 and the pressing plate 53 are pressed downward again, the soil sample is extruded by the pressing of the pressing plate 53, after the extrusion is completed, the pressing plate 53 is moved to the upper side of the top block 55 again, and the pressing plate 53 is rotated, so that the block hole 54 of the pressing plate 53 avoids the position of cooperating with the top block 55, when the pressing plate 53 moves upward, it contacts the lower elastic disc 61 and extrudes the lower elastic disc 61 and the lower elastic spring 62, at this time, the lower elastic disc 61 presses the pressing plate 53 and the top block 55 tightly by the elastic force, which increases the stability of the pressing plate 53, thus the whole working process is completed.

[0023] The above-mentioned front, rear, left, right, up and down are based on the Figure 1 of the drawings.

[0024] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the application.

[0025] The embodiments of the application described above in conjunction with the drawings are detailed, but the application is not limited to the described embodiments.

[0026] For those skilled in the art, various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the application, and still fall within the scope of protection of the application.

Claims

1. A multi-stage sampling device based on an environmental monitoring device, comprising a sampling device body (1), the sampling device body (1) comprising a lower rotating box (11) and a multi-stage sampling mechanism (2) connected to the lower end of the lower rotating box (11), characterized in that: The multi-stage sampling mechanism (2) comprises a connecting cover (201), an inner connecting disc (202), a limiting disc (203), a sampling rod (204), a sampling pipe (207), an annular cover (209) and an upper cover (210), the lower end of the lower rotary box (11) is screw-connected with the upper end of the connecting cover (201), the inner lower side of the connecting cover (201) is connected with the outer wall of the inner connecting disc (202), the inner wall of the inner connecting disc (202) is slidingly connected with the outer wall of the sampling rod (204), the outer wall of the sampling rod (204) is fixedly connected with the inner ring of the limiting disc (203), the outer wall of the sampling rod (204) is connected with an upper limiting disc on the upper side, and the inner connecting disc (202) is located between the limiting disc (203) and the upper limiting disc, the outer wall of the sampling rod (204) is provided with a sampling port (205) and a pipe port (206), the pipe port (206) is vertically located in the region between the upper surface of the limiting disc (203) and the lower surface of the upper limiting disc, and the sampling port (205) is located on the lower side of the limiting disc (203), the inner wall of the sampling rod (204) is slidingly connected with the outer wall of the sampling pipe (207), the outer wall of the sampling pipe (207) is provided with a sampling groove, the side wall of the sampling groove is provided with an annular groove (208), the inner wall of the annular groove (208) is slidingly connected with the outer wall of the annular cover (209), the upper end of the sampling pipe (207) is connected with the lower end of the upper cover (210), the upper end of the upper cover (210) is provided with an annular through port (211), the upper end of the annular cover (209) extends to the outer side of the sampling pipe (207) through the annular through port (211), the upper end of the sampling pipe (207) is connected with a connecting mechanism (4), and the upper end of the sampling rod (204) is connected with a driving mechanism (3).

2. The multi-stage sampling device based on an environmental monitoring device according to claim 1, characterized in that: The driving mechanism (3) comprises a driving gear (31), a power motor (32), a lead screw (33), a transmission gear (35) and a lifting disc (36), the upper side of the outer wall of the limiting disc (203) is connected with the outer wall of the power motor (32), and the output end of the power motor (32) is connected with the inner ring of the driving gear (31).

3. The multi-stage sampling device based on an environmental monitoring device according to claim 2, characterized in that: The inner wall of the sampling rod (204) is provided with an annular groove (34), the lower wall of the annular groove (34) is rotationally connected with the lower end of the lead screw (33), the upper end of the lead screw (33) extends to the outer side of the sampling rod (204), the outer wall of the lead screw (33) is connected with the inner ring of the transmission gear (35) on the upper side, and the transmission gear (35) is engaged with the driving gear (31).

4. The multi-stage sampling device based on an environmental monitoring device according to claim 1, characterized in that: The connecting mechanism (4) comprises a connecting protrusion (41), a lower sealing plate (42) and a screw (44), the upper end of the sampling pipe (207) is connected with the lower end of the connecting protrusion (41), the lower end of the sampling pipe (207) is connected with the upper end of the lower sealing plate (42), the lower end of the lower sealing plate (42) is provided with a connecting groove (43), the connecting groove (43) is matched with the connecting protrusion (41), and the upper end of the connecting protrusion (41) is connected with a connecting mechanism (5).

5. The multi-stage sampling device based on an environmental monitoring device according to claim 4, characterized in that: The outer wall of the lower sealing plate (42) is provided with two side grooves (45), the inner wall of the two threaded holes is in screw connection with the outer wall of the screw (44), and the two screws (44) extend into the inner part of the connecting groove (43).

6. The multi-stage sampling device based on an environmental monitoring device according to claim 4, characterized in that: The connecting mechanism (5) comprises a connecting rod (51), a pressing plate (53) and a top block (55), the upper end of the connecting block (41) is provided with a lifting hole, the inner wall of the lifting hole is in sliding connection with the outer wall of the connecting rod (51), and the lower end of the connecting rod (51) extends into the sampling groove.

7. The multi-stage sampling device based on an environmental monitoring device according to claim 6, characterized by: The upper end of the connecting rod (51) is provided with a connecting hole (52), the inner wall of the connecting hole (52) is provided with an internal thread, the lower end of the connecting rod (51) is connected with the upper end of the pressing plate (53), and the outer wall of the pressing plate (53) is provided with an avoiding block hole (54).

8. The multi-stage sampling device based on an environmental monitoring device according to claim 7, characterized by: The upper end of the inner wall of the sampling groove is connected with the top block (55), the top block (55) is matched with the avoiding block hole (54), the lower end of the pressing plate (53) is provided with an annular through groove, and the upper side of the pressing plate (53) is connected with a lower elastic mechanism (6).

9. The multi-stage sampling device based on an environmental monitoring device according to claim 8, characterized in that: The lower elastic mechanism (6) comprises a lower elastic disc (61) and a lower elastic spring (62), the upper end of the lower elastic spring (62) is connected with the top wall of the sampling groove, the lower end is connected with the lower elastic disc (61), and the lower elastic disc (61) is matched with the pressing plate (53).

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