A soil compaction device for environmental protection testing

Abstract

This invention discloses a soil pulverizing device for environmental protection testing, comprising a support frame, a reciprocating drive mechanism, an annular extrusion plate, movable extrusion components, an annular loading box, and a rotation drive mechanism. A first guide support rod is disposed inside the support frame. The annular extrusion plate and the annular loading box are sequentially arranged from top to bottom at the bottom of the first guide support rod. The annular extrusion plate can be inserted into the annular groove of the annular loading box. The reciprocating drive mechanism drives the annular extrusion plate to move up and down reciprocally. Several movable extrusion components are disposed on the annular extrusion plate. The rotation drive mechanism drives the annular loading box to rotate freely at the bottom of the first guide support rod. This invention pulverizes the soil without simultaneously crushing small stones or plant roots embedded within it, allowing for the removal of small stones or plant roots in the soil later, thereby improving the accuracy of subsequent soil testing.

Description

Technical Field

[0001] This utility model relates to the field of soil testing technology, specifically a soil crushing device for environmental protection testing. Background Technology

[0002] Soil testing involves analyzing and evaluating soil samples to determine the levels of nutrients and harmful substances in the soil. It is of great significance for agricultural production, environmental protection, and human health.

[0003] Currently, in the preliminary stage of soil testing, naturally air-dried soil needs to be crushed to facilitate subsequent equal sampling and testing. Air-dried soil is generally crushed manually or mechanically. When crushing soil manually, small stones or plant roots mixed in with the soil can be detected simultaneously, ensuring the accuracy of subsequent soil testing. However, manual soil crushing is inefficient. Chinese utility model patent CN215262722U discloses a soil crushing device for environmental protection testing, which achieves mechanized soil crushing through the cooperation of a crushing head and a crushing cylinder. However, when the crushing head and cylinder work together to crush the soil, small stones and plant roots mixed in with the soil are simultaneously crushed. The presence of these components can affect the accuracy of soil testing. Utility Model Content

[0004] The purpose of this invention is to provide a soil crushing device for environmental protection testing. In this crushing device, there is a certain gap between the annular extrusion plate and the annular loading box, so that the annular extrusion plate will not easily crush small stones and plant roots. At the same time, the movable extrusion plate, under the push of the first spring, can fully crush the soil while not easily crushing small stones or plant roots. This allows for the removal of impurities from the crushed soil, thereby ensuring the accuracy of subsequent soil testing.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a soil tamping device for environmental protection testing, including a support frame, a reciprocating drive mechanism, an annular extrusion plate, a movable extrusion assembly, an annular loading box, and a rotation drive mechanism. A first guide support rod is fixedly installed inside the support frame, with the bottom of the first guide support rod suspended. The annular extrusion plate and the annular loading box are arranged sequentially from top to bottom at the bottom of the first guide support rod. The annular extrusion plate can be inserted into the annular groove of the annular loading box. The reciprocating drive mechanism is used to drive the annular extrusion plate to move up and down reciprocally. When the annular extrusion plate is in its lowest position, the distance between the bottom surface of the annular extrusion plate and the inner bottom surface of the annular loading box is L, 0.5cm≤L≤1.5cm; the annular extrusion plate is provided with a plurality of movable extrusion components evenly distributed along its circumference, each group of movable extrusion components includes a movable extrusion plate, and the annular extrusion plate is provided with a first through hole corresponding to the movable extrusion plate, the movable extrusion plate can move up and down in the corresponding first through hole; the rotation drive mechanism is used to drive the annular loading box to rotate freely at the bottom of the first guide support rod.

[0006] Preferably, the sliding sleeve at the center of the annular extrusion plate is slidably fitted onto the first guide support rod, and two vertical guide grooves are provided on the side wall of the first guide support rod. The upper part of the inner side wall of the sliding sleeve is provided with a first guide block fitted into the corresponding guide groove.

[0007] Furthermore, the reciprocating drive mechanism includes a first drive motor, a crank, and a transmission connecting rod. The first drive motor is fixedly mounted on the support frame. One end of the crank is fixedly connected to the output shaft of the first drive motor. One end of the transmission connecting rod is hinged to the other end of the crank. The other end of the transmission connecting rod is hinged to the upper part of the outer side wall of the sliding sleeve.

[0008] Furthermore, several adjustment holes are provided on the end of the crank away from the output shaft of the first drive motor.

[0009] Furthermore, a shoulder is provided at the bottom of the first guide support rod, and three bearings are fitted at the shoulder, with the annular loading box fitted outside the three bearings.

[0010] Furthermore, an annular support plate is provided below the three bearings, and an L-shaped locating pin is provided below the annular support plate.

[0011] Preferably, six sets of the movable extrusion components are provided on the annular extrusion plate. A first support plate is fixedly provided above each of the first through holes. Two first guide rods are fixedly provided above each of the movable extrusion plates. The first guide rods are slidably sleeved on the first support plate. A first limiting plate is fixedly provided above the first guide rods. A first spring is sleeved on the first guide rods and the first spring is clamped between the first support plate and the movable extrusion plate.

[0012] Preferably, the annular extrusion plate is further provided with two sets of soil-turning components. Each set of soil-turning components includes a second support plate. Two first soil-turning claws are provided at both ends of the bottom side of the second support plate. The two first soil-turning claws are adjacent to the corresponding vertical inner sidewall of the annular loading box and are distributed in a figure-eight shape. Two triangular second soil-turning claws are provided between the two first soil-turning claws. The annular extrusion plate is provided with a second through hole corresponding to the second support plate. A third support plate is fixedly provided at the upper part of each second through hole. Two second guide rods are fixedly provided at the upper part of each second support plate. The second guide rods are slidably sleeved on the third support plate. A second limiting plate is fixedly provided at the upper part of the second guide rods. A second spring is sleeved on the second guide rods and the second spring is clamped between the second support plate and the third support plate. The second support plate, the first soil-turning claws and the second soil-turning claws can all move freely up and down in the second through hole.

[0013] Preferably, the rotation drive mechanism includes a second drive motor and a drive wheel. The drive wheel is vertically disposed on the outside of the annular loading box and the side wall of the drive wheel is in contact with the outer side wall of the annular loading box. The second drive motor is used to drive the drive wheel to rotate.

[0014] The beneficial effects of this utility model are as follows: The utility model has a simple structure and is convenient to manufacture; there is a certain gap between the lowest position of the annular extrusion plate and the bottom of the annular loading box, so that even when the annular extrusion plate reaches its lowest position, it is not easy to break small stones or plant roots in the soil; the movable extrusion plate, supported by the first spring, can fully extrude and crush the soil, but when the movable extrusion plate encounters relatively hard small stones or plant roots, the first spring cannot support the movable extrusion plate to crush the small stones or plant roots, thus ensuring that small stones or plant roots in the soil are not severely crushed during the entire soil crushing process. After crushing, small stones and plant roots can be sieved out from the crushed soil, which helps to ensure the accuracy of subsequent soil testing; during the continuous extrusion of the soil by the annular extrusion plate and the movable extrusion plate, the annular loading box rotates synchronously, thus achieving effective crushing of the soil from all directions. Furthermore, during the rotation of the annular loading box, the first and second turning claws can be used to turn the soil, which helps to improve the soil crushing efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some preferred embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a partial structural schematic diagram of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the first guide support rod;

[0019] Figure 4 This is a schematic diagram of the overall structure of the soil turning component;

[0020] Figure 5 This is a schematic diagram of the overall structure of the active extrusion assembly;

[0021] Figure 6 This is a schematic diagram of the overall structure of the annular extrusion plate;

[0022] Figure 7 This is a schematic diagram of the overall structure of the ring-shaped loading box;

[0023] Figure 8 A top view of the combination of the soil turning component and the ring loading box;

[0024] Figure 9 for Figure 2 Enlarged view of point A in the middle;

[0025] Figure 10 for Figure 2 Enlarged view at point B in the middle;

[0026] In the figure: 1 Support frame, 11 First guide bearing rod, 111 Guide groove, 112 Bearing, 113 Annular support plate, 114 L-shaped positioning pin, 12 First connecting plate, 13 Second connecting plate, 21 First drive motor, 22 Crank, 221 Adjustment hole, 23 Transmission connecting rod, 3 Annular extrusion plate, 31 First through hole, 32 First support plate, 33 Sliding sleeve, 331 First guide block, 34 Second through hole, 35 Third support plate, 4 Movable extrusion assembly, 41 Movable extrusion plate, 42 First guide rod, 421 First limiting plate, 43 First spring, 5 Annular loading box, 51 Annular groove, 61 Second drive motor, 62 Drive wheel, 7 Soil turning assembly, 71 Second support plate, 72 First soil turning claw, 73 Second soil turning claw, 74 Second guide rod, 741 Second limiting plate, 75 Second spring. Detailed Implementation

[0027] The following will describe specific embodiments and appendices. Figure 1-10 The technical solutions in the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some preferred embodiments of this utility model, and not all embodiments. Those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0028] This utility model provides a soil compaction device for environmental protection testing (such as...). Figure 1As shown, the device includes a support frame 1, a reciprocating drive mechanism, an annular extrusion plate 3, a movable extrusion assembly 4, an annular loading box 5, and a rotation drive mechanism. The support frame 1 supports the overall structure of the device, ensuring stable placement. In this specific embodiment, the support frame 1 consists of a support plate and four support legs arranged around the bottom of the support plate. A first guide support rod 11 is fixedly installed inside the support frame 1. The upper part of the first guide support rod 11 is welded to the bottom of the support plate, and the bottom of the first guide support rod 11 is suspended. The annular extrusion plate 3 and the annular loading box 5 are arranged sequentially from top to bottom at the bottom of the first guide support rod 11. The annular extrusion plate 3 can be inserted into the annular groove 51 of the annular loading box 5. During the process, the soil that needs to be dried and crushed is placed in the annular groove 51. The annular extrusion plate 3 moves up and down in the annular groove 51 to crush the soil. The reciprocating drive mechanism drives the annular extrusion plate 3 to move up and down. When the annular extrusion plate 3 is in its lowest position, the distance between the bottom surface of the annular extrusion plate 3 and the inner bottom surface of the annular loading box 5 is L, 0.5cm≤L≤1.5cm. The height difference between the annular extrusion plate 3 and the annular loading box 5 makes it difficult for the annular extrusion plate 3 to crush small stones and plant roots mixed in with the soil. This facilitates the removal of small stones and plant roots from the soil in the later stages, thereby improving the purity of the soil and ensuring the accuracy of the soil testing in the later stages. In this specific embodiment, the value of L can be set to 1.0cm; The reciprocating drive mechanism moves the annular extrusion plate 3 up and down, which improves the crushing efficiency. Several movable extrusion components 4 are evenly distributed along the circumference of the annular extrusion plate 3. Each movable extrusion component 4 includes a movable extrusion plate 41. A first through hole 31 corresponding to the movable extrusion plate 41 is provided on the annular extrusion plate 41. The movable extrusion plate 41 can move up and down within the corresponding first through hole 31. In practical application, the movable extrusion plate 41 moves up and down following the annular extrusion plate 3. During the downward movement of the movable extrusion plate 41, if there are no small stones or plant roots mixed in with the soil below, the movable extrusion plate 41 can fully extrude the soil. The pressing action achieves a crushing effect. When small stones or plant roots are mixed in the soil below the movable pressing plate 41, the movable pressing plate 41 will not continue to move downwards after encountering these obstacles. This prevents the movable pressing plate 41 from easily crushing the small stones or plant roots. Since neither the annular pressing plate 3 nor the movable pressing plate 41 can crush the small stones or plant roots, the small stones or plant roots in the soil can be sieved out after crushing. This sieving improves the purity of the soil to be tested, thus ensuring the accuracy of subsequent soil testing. The rotation drive mechanism drives the annular loading box 5 to rotate freely at the bottom of the first guide support rod 11. During the soil crushing process using the annular pressing plate 3 and the movable pressing plate 41, the annular loading box 5 synchronously drives the soil to rotate, facilitating comprehensive soil crushing.

[0029] Based on the above embodiments, the specific implementation of the vertical up-and-down sliding of the annular extrusion plate 3 on the first guide support rod 11 is as follows: the sliding sleeve 33 at the center of the annular extrusion plate 3 is slidably sleeved on the first guide support rod 11, and two vertical guide grooves 111 are provided on the side wall of the first guide support rod 11. The upper part of the inner side wall of the sliding sleeve 33 is provided with a first guide block 331 sleeved in the corresponding guide groove 111. By utilizing the up-and-down sliding of the first guide block 331 in the guide groove 111, the stable up-and-down sliding of the annular extrusion plate 3 on the first guide support rod 11 is realized. Further, the specific implementation of the reciprocating drive mechanism is as follows: The reciprocating drive mechanism includes a first drive motor 21, a crank 22, and a transmission connecting rod 23. The first drive motor 21 is fixedly mounted on the support frame 1. Specifically, the first drive motor 21 is fixedly mounted on a first connecting plate 12 at the bottom of the support plate of the support frame 1. One end of the crank 22 is fixedly connected to the output shaft of the first drive motor 21. One end of the transmission connecting rod 23 is hinged to the other end of the crank 22. The other end of the transmission connecting rod 23 is hinged to the upper part of the outer side wall of the sliding sleeve 33. That is, the crank 22 and the transmission connecting rod 23 can achieve relative free rotation through the hinged connection, and the transmission connecting rod 23 and the sliding sleeve 33 can also achieve relative free rotation through the hinged connection. When the first drive motor 21 drives the crank 22 to perform circular motion, the transmission action of the transmission link 23 can realize the up-and-down reciprocating movement of the annular extrusion plate 3. Furthermore, in order to facilitate the adjustment of the up-and-down movement amplitude of the annular extrusion plate 3 according to the size of the small stones and plant roots mixed in the actual soil, a number of adjustment holes 221 are provided on the end of the crank 22 away from the output shaft of the first drive motor 21. By connecting the upper end of the transmission link 23 to different adjustment holes 221, the lowest position of the annular extrusion plate 3 can be changed, thereby realizing the adjustment of the extrusion gap between the annular extrusion plate 3 and the annular loading box 5.

[0030] Based on the above embodiments, to facilitate the free and flexible rotation of the annular loading box 5 at the bottom of the first guide support rod 11, a shoulder is provided at the bottom of the first guide support rod 11. Three bearings 112 are fitted onto the shoulder, and the three bearings 112 can be fixed to the bottom of the first guide support rod 11 by a shaft snap ring. The annular loading box 5 is fitted outside the three bearings 112. By using the three bearings 112 to support the inner ring of the annular loading box 5, the flexible rotation of the annular loading box 5 can be achieved. Furthermore, to facilitate the free and flexible rotation of the annular loading box 5 at the bottom of the first guide support rod 11, a shoulder is provided at the bottom of the first guide support rod 11. Three bearings 112 are fitted onto the shoulder, and the three bearings 112 can be used to support the inner ring of the annular loading box 5, thus enabling the flexible rotation of the annular loading box 5. For the installation and removal of the bottom of the support rod 11, an annular support plate 113 is installed below the three bearings 112, and an L-shaped positioning pin 114 is installed below the annular support plate 113. The L-shaped positioning pin 114 supports the annular support plate 113, thus providing stable support for the annular loading box 5. When disassembling the annular loading box 5, first pull the L-shaped positioning pin 114 out from the bottom of the first guide support rod 11, then remove the annular support plate 113, and finally remove the annular loading box 5 from the bottom of the first guide support rod 11. After removing the annular loading box 5, a screening device can be used to screen the crushed soil in the annular loading box 5, thereby removing small stones and plant roots from the soil.

[0031] Based on the above embodiments, the specific implementation of the movable extrusion plate 41 being able to move freely up and down relative to the annular extrusion plate 3 is as follows: six sets of movable extrusion components 4 are provided on the annular extrusion plate 3; a first support plate 32 is fixedly provided above each first through hole 31; two first guide rods 42 are fixedly provided above each movable extrusion plate 41; the first guide rods 42 are slidably sleeved on the first support plate 32; and a first limiting plate 421 is fixedly provided above the first guide rods 42. A first spring 43 is fitted onto the first guide rod 42 and clamped between the first support plate 32 and the movable extrusion plate 41. In actual application, after the first limiting plate 421 presses against the first support plate 32, the movable extrusion plate 41 is in its lowest position. At this time, the distance between the bottom surface of the movable extrusion plate 41 and the bottom surface of the annular extrusion plate 3 is about 3mm larger than the value of L. This ensures that after the annular extrusion plate 3 moves downward into place, the movable extrusion plate 41 can fully extrude soil below it. The pressure then breaks up the soil. After the first limiting plate 421 presses against the first support plate 32, the first spring 43 pushes the movable pressing plate 41, causing the movable pressing plate 41 and the annular pressing plate 3 to move downwards synchronously. During this synchronous downward movement, if there are no small stones or plant roots in the soil below the movable pressing plate 41, the dry soil clods have low structural strength, allowing the movable pressing plate 41 to crush the soil under the support of the first spring 41. When small stones or plant roots are crushed, because they are relatively hard, once the movable extrusion plate 41 comes into contact with them, it cannot continue to move downwards as the annular extrusion plate 3 continues to move downwards. This prevents the movable extrusion plate 41 from crushing the small stones or plant roots. Since neither the annular extrusion plate 3 nor the movable extrusion plate 41 can crush the small stones or plant roots, it is easier to remove them from the crushed soil, thus ensuring the accuracy of subsequent soil testing.

[0032] While the annular extrusion plate 3 and the movable extrusion plate 41 reciprocate up and down, the annular loading box 5 rotates synchronously. After a certain period of time, the naturally air-dried soil in the annular loading box 5 can be crushed. To improve the extrusion and crushing efficiency of the annular extrusion plate 3 and the movable extrusion plate 41, two sets of soil-turning components 7 are also provided on the annular extrusion plate 3. Each set of soil-turning components includes a second support plate 71. Two first soil-turning claws 72 are provided at both ends of the bottom side of the second support plate 71. The two first soil-turning claws 72 are adjacent to the corresponding vertical inner sidewall of the annular loading box 5, and the two first soil-turning claws 72 are distributed in a figure-eight shape. In actual application... The large opening between the two first turning claws 72 is opposite to the rotation direction of the annular loading box 5. The two first turning claws 72 can then push the soil from the edges of the annular loading box 5 towards the center. Two triangular second turning claws 73 are spaced between the two first turning claws 72, with one apex of each second turning claw 73 opposite to the rotation direction of the annular loading box 5. As the annular loading box 5 rotates, the second turning claws 73 can push the soil in the center of the annular loading box 5 to both sides. Therefore, through the cooperation of the first turning claws 72 and the second turning claws 73, the soil can be turned over, thereby improving the efficiency of soil compaction. This is to ensure that the soil is properly compacted within the annular extrusion plate 3... During the descent, the first turning claw 72 and the second turning claw 73 can contact the soil in the annular loading box 5 as early as possible. Simultaneously, the contact between the first turning claw 72 and the second turning claw 73 and the soil does not affect the continued descent of the annular compression plate 3. Here, the annular compression plate 3 is provided with a second through hole 34 corresponding to the second support plate 71. A third support plate 35 is fixedly installed above each second through hole 34. Two second guide rods 42 are fixedly installed above each second support plate 71. The second guide rods 42 are slidably sleeved on the third support plate 35. A second limiting plate 421 is fixedly installed above the second guide rods 42. A second spring 43 is fitted onto the second guide rod 42 and is clamped between the second support plate 71 and the third support plate 35. The second support plate 71, the first turning claw 72, and the second turning claw 73 can all move freely up and down within the second through hole 34. That is, after the first turning claw 72 and the second turning claw 73 come into contact with the soil in the annular loading box 5 and can no longer descend, as the annular compression plate 3 continues to descend while squeezing the second spring 43, the second support plate 71, the first turning claw 72, and the third turning claw 73 can enter the second through hole 34, so that they will not obstruct the descent of the annular support plate 3, thereby ensuring the squeezing effect of the annular compression plate 3 on the soil.

[0033] In practical applications, when the annular extrusion plate 3 and the movable extrusion plate 41 come into contact with the soil, they rotate synchronously with the annular loading box 5, which can achieve a kneading and crushing effect on the soil, thereby further improving the soil crushing effect.

[0034] Based on the above embodiments, the specific implementation of the rotation drive mechanism is as follows: The rotation drive mechanism includes a second drive motor 61 and a drive wheel 62. The drive wheel 62 is vertically arranged on the outside of the annular loading box 5, and the side wall of the drive wheel 62 is in contact with the outer side wall of the annular loading box 5. The second drive motor 61 is used to drive the drive wheel 62 to rotate. During the continuous rotation of the drive wheel 62, the friction between the drive wheel 62 and the side wall of the annular loading box 5 is used to drive the annular loading box 5. In practical applications, when the annular loading box 5 is installed at the bottom of the first guide support rod 11, in order to facilitate the smooth contact between the side wall of the drive wheel 62 and the annular loading box 5, the bottom of the drive wheel 62 is made to have a conical structure.

[0035] In this utility model, "front", "rear", "up", "down", "left", and "right" are all relative positions used to facilitate the description of positional relationships, and therefore cannot be understood as absolute positions as a limitation on the scope of protection.

[0036] Except for the technical features described in the specification, all other technologies are known to those skilled in the art.

[0037] The preferred embodiments and examples of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments and examples. For those skilled in the art, several improvements and modifications can be made without departing from the concept of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A soil compaction device for environmental protection testing, characterized in that, The device includes a support frame, a reciprocating drive mechanism, an annular extrusion plate, movable extrusion components, an annular loading box, and a rotation drive mechanism. A first guide support rod is fixedly installed inside the support frame, with its bottom suspended. The annular extrusion plate and the annular loading box are sequentially arranged from top to bottom at the bottom of the first guide support rod. The annular extrusion plate can be inserted into the annular groove of the annular loading box. The reciprocating drive mechanism drives the annular extrusion plate to reciprocate up and down. When the annular extrusion plate is at its lowest position, the distance between the bottom surface of the annular extrusion plate and the inner bottom surface of the annular loading box is L, where 0.5cm ≤ L ≤ 1.5cm. The annular extrusion plate has several movable extrusion components evenly spaced along its circumference. Each group of movable extrusion components includes a movable extrusion plate. The annular extrusion plate has a first through hole corresponding to the movable extrusion plate, allowing the movable extrusion plate to move up and down within the corresponding first through hole. The rotation drive mechanism drives the annular loading box to rotate freely at the bottom of the first guide support rod.

2. The soil compaction device for environmental protection testing according to claim 1, characterized in that, The sliding sleeve at the center of the annular extrusion plate is slidably fitted onto the first guide support rod. Two vertical guide grooves are provided on the side wall of the first guide support rod. A first guide block is provided on the upper part of the inner side wall of the sliding sleeve, which is fitted into the corresponding guide groove.

3. The soil compaction device for environmental protection testing according to claim 2, characterized in that, The reciprocating drive mechanism includes a first drive motor, a crank, and a transmission connecting rod. The first drive motor is fixedly mounted on the support frame. One end of the crank is fixedly connected to the output shaft of the first drive motor. One end of the transmission connecting rod is hinged to the other end of the crank. The other end of the transmission connecting rod is hinged to the upper part of the outer side wall of the sliding sleeve.

4. The soil compaction device for environmental protection testing according to claim 3, characterized in that, Several adjustment holes are provided on the end of the crank away from the output shaft of the first drive motor.

5. The soil compaction device for environmental protection testing according to claim 4, characterized in that, in The bottom of the first guide support rod is provided with a shoulder, and three bearings are sleeved on the shoulder. The annular loading box is sleeved on the outside of the three bearings.

6. The soil compaction device for environmental protection testing according to claim 5, characterized in that, An annular support plate is provided below the three bearings, and an L-shaped locating pin is provided below the annular support plate.

7. The soil compaction device for environmental protection testing according to claim 1, characterized in that, Six sets of movable extrusion components are provided on the annular extrusion plate. A first support plate is fixedly provided above each first through hole. Two first guide rods are fixedly provided above each movable extrusion plate. The first guide rods are slidably sleeved on the first support plate. A first limiting plate is fixedly provided above the first guide rod. A first spring is sleeved on the first guide rod and the first spring is clamped between the first support plate and the movable extrusion plate.

8. The soil compaction device for environmental protection testing according to claim 1, characterized in that, Two sets of soil-turning components are also provided on the annular extrusion plate. Each set of soil-turning components includes a second support plate. Two first soil-turning claws are provided at both ends of the bottom side of the second support plate. The two first soil-turning claws are adjacent to the corresponding vertical inner sidewall of the annular loading box and are distributed in a figure-eight shape. Two triangular second soil-turning claws are provided between the two first soil-turning claws. A second through hole corresponding to the second support plate is provided on the annular extrusion plate. A third support plate is fixedly provided on the upper part of each second through hole. Two second guide rods are fixedly provided on the upper part of each second support plate. The second guide rods are slidably sleeved on the third support plate. A second limiting plate is fixedly provided on the upper part of the second guide rods. A second spring is sleeved on the second guide rods and the second spring is clamped between the second support plate and the third support plate. The second support plate, the first soil-turning claws and the second soil-turning claws can all move freely up and down in the second through hole.

9. The soil compaction device for environmental protection testing according to claim 1, characterized in that, The rotation drive mechanism includes a second drive motor and a drive wheel. The drive wheel is vertically arranged on the outside of the annular loading box and its sidewall is in contact with the outside wall of the annular loading box. The second drive motor is used to drive the drive wheel to rotate.

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