阅读说明：本技术 一种用于公路施工的底层取样装置 (Bottom layer sampling device for highway construction ) 是由 李智强 樊红燕 柴金燕 周文卿 于 2021-10-11 设计创作，主要内容包括：本发明公开了一种用于公路施工的底层取样装置,包括矩形箱体,所述矩形箱体下端设有样土分割机构,所述矩形箱体下端设有转动取样机构,所述转动取样机构上方设有主动出料机构,所述矩形箱体一侧设有样品存放机构。本发明的有益效果是,通过转动取样机构的作用可以利用转筒的转动对土层快速的取样,通过主动出料机构的工作可以使圆形板下移,并将土样快速与取样桶分离,简化人工操作的同时,大幅提高取样效率；通过样品存放机构的作用可以使设有多个盛放筒的转动盘转动,便于对多个样品进行暂时的保存,避免土样污染,间接提高检测精度。(The invention discloses a bottom layer sampling device for highway construction, which comprises a rectangular box body, wherein a sample soil cutting mechanism is arranged at the lower end of the rectangular box body, a rotary sampling mechanism is arranged at the lower end of the rectangular box body, an active discharging mechanism is arranged above the rotary sampling mechanism, and a sample storage mechanism is arranged on one side of the rectangular box body. The soil sampler has the advantages that the soil layer can be quickly sampled by the rotation of the rotary drum under the action of the rotary sampling mechanism, the circular plate can move downwards through the work of the active discharging mechanism, the soil sample is quickly separated from the sampling barrel, the manual operation is simplified, and the sampling efficiency is greatly improved; the rotating disc provided with a plurality of containing barrels can be rotated under the action of the sample storage mechanism, so that temporary storage is facilitated for a plurality of samples, soil sample pollution is avoided, and detection precision is indirectly improved.)

1. A bottom layer sampling device for highway construction comprises a rectangular box body (1), wherein a sample soil cutting mechanism is arranged at the lower end of the rectangular box body (1), and is characterized in that a rotary sampling mechanism is arranged at the lower end of the rectangular box body (1), an active discharging mechanism is arranged above the rotary sampling mechanism, and a sample storage mechanism is arranged on one side of the rectangular box body (1);

the rotary sampling mechanism comprises a hydraulic cylinder (2) at one end of the upper surface of a rectangular box body (1), a ball bearing I (3) is mounted at the telescopic end of the hydraulic cylinder (2), a sliding column (4) is mounted at the inner ring of the ball bearing I (3), a rectangular hole (5) is formed in the center of the sliding column (4), a sampling cylinder (6) is mounted at the lower end of the sliding column (4), and a drill bit (7) is mounted at the lower end of the sampling cylinder (6); a fixing ring (8) is mounted at one end of the upper surface of the rectangular box body (1), a ball bearing II (9) is mounted on an inner ring of the fixing ring (8), a connecting shaft (10) is mounted on an inner ring of the ball bearing II (9), a rectangular shaft (11) is mounted at the lower end of the connecting shaft (10), and the rectangular shaft (11) is inserted into the rectangular hole (5); the center of each of the sliding column (4), the rectangular shaft (11), the connecting shaft (10) and the sampling tube (6) is provided with a circular through hole (12), the inner side of each circular through hole (12) is provided with a sliding rod (13), each sliding rod (13) penetrates through the corresponding circular through hole (12), the lower end of each sliding rod (13) is provided with a circular plate (14), the upper end of each sampling tube (6) is provided with a spring groove (15), a tension spring (16) is arranged between each spring groove (15) and the corresponding circular plate (14), and the upper end of the connecting shaft (10) is provided with a first bevel gear (17);

the active discharging mechanism comprises a connecting rod (18) arranged at the upper end of the hydraulic cylinder (2), a rectangular column (19) is arranged at one end of the connecting rod (18), a rectangular inclined plate (20) is arranged at the lower end of the rectangular column (19), a rectangular through hole (21) is formed in the center of the rectangular inclined plate (20), the rectangular inclined plate (20) is in sliding connection with the rectangular column (19), vertical bearings (22) are arranged at two ends of the rectangular column (19), reciprocating threaded shafts (23) are arranged on inner rings of the vertical bearings (22), bevel gears (24) are arranged at the lower ends of the reciprocating threaded shafts (23), and inner threaded blocks (25) meshed with the reciprocating threaded shafts (23) are arranged at one end of the rectangular inclined plate (20);

the sample storage mechanism comprises a third ball bearing (26) arranged at the center of the rectangular box body (1), a transmission shaft (27) is arranged on the inner ring of the third ball bearing (26), a third bevel gear (28) is arranged at the upper end of the transmission shaft (27), a rotating disc (29) is arranged at the lower end of the transmission shaft (27), a first circular hole (30) is formed in the upper surface of the rotating disc (29), a U-shaped groove (31) is formed in the upper surface of the rotating disc (29), a containing cylinder (32) is arranged on one side of the U-shaped groove (31), and the containing cylinder (32) is in sliding connection with the U-shaped groove (31); the upper surface of the rectangular box body (1) is provided with a stepping motor (33), the rotating end of the stepping motor (33) is provided with an output shaft (34), one end of the output shaft (34) is provided with a first driving wheel (35) meshed with the first bevel gear (17), the center of the output shaft (34) is provided with a first limiting groove (36), the center of the output shaft (34) is provided with a second driving wheel (37) meshed with the second bevel gear (24), a first compression spring (38) is arranged between the second driving wheel (37) and the output shaft (34), a first permanent magnet (39) is arranged on the side surface of the second driving wheel (37), the upper surface of the rectangular box body (1) is provided with a first electromagnet (40), and the first electromagnet (40) corresponds to the first permanent magnet (39); one end of the output shaft (34) is provided with a second limiting groove (41), one end of the output shaft (34) is provided with a third driving wheel (42) meshed with the third bevel gear (28), a second compression spring (43) is arranged between the third driving wheel (42) and the output shaft (34), a second permanent magnet (44) is arranged on the side surface of the third driving wheel (42), a second electromagnet (45) is arranged on the upper surface of the rectangular box body (1), and the position of the second electromagnet (45) corresponds to that of the second permanent magnet (44).

2. The bottom sampling device for highway construction according to claim 1, wherein the soil sample dividing mechanism comprises an arc-shaped groove (46) formed at the lower end of the sampling cylinder (6), a swing rod (47) is installed at one end of the arc-shaped groove (46), the swing rod (47) is hinged with the arc-shaped groove (46), a torsion spring (48) is installed between the swing rod (47) and the arc-shaped groove (46), and a first soil leakage hole (49) is formed in one side of the arc-shaped groove (46).

3. The ground sampling device for road construction according to claim 1, wherein driving wheels (50) are installed at four corners of the lower end of the rectangular box body (1).

4. The sampling device of the bottom layer for highway construction as recited in claim 1, wherein the sampling cylinder (6) is provided with a second soil leakage hole (51) at the upper end.

5. The ground floor sampling device for road construction according to claim 1, characterized in that the rectangular box (1) has a taking hole (52) opened on the side surface.

6. The ground floor sampling device for road construction according to claim 1, wherein the rectangular box body (1) is provided with a second circular hole (53) on the lower surface.

7. The floor sampling device for road construction according to claim 1, characterized in that a protective cover (54) is installed on the upper surface of the rectangular box body (1).

8. The floor sampling device for road construction according to claim 1, characterized in that the rectangular box (1) is surface-mounted with a fixed bearing (55).

Technical Field

The invention relates to the technical field of highway construction sampling, in particular to a bottom layer sampling device for highway construction.

Background

In road construction, sampling detection needs to be carried out on a road foundation, an existing sampling device, such as a patent with the patent number of CN201811456022.3, is named as a road construction base layer sampling device, although the existing sampling device can meet basic sampling requirements, the manual operation is complex after the sampling is finished, a corresponding tool needs to be manually held to buckle a soil sample, and the sampling efficiency is seriously influenced; and the soil sample cannot be perfectly stored, and is easy to pollute, so that the detection accuracy is influenced.

Disclosure of Invention

In view of the above drawbacks, the present invention provides a bottom layer sampling device for highway construction, which solves the above problems.

In order to achieve the purpose, the invention adopts the following technical scheme:

a bottom layer sampling device for highway construction comprises a rectangular box body, wherein a sample soil cutting mechanism is arranged at the lower end of the rectangular box body, a rotary sampling mechanism is arranged at the lower end of the rectangular box body, an active discharging mechanism is arranged above the rotary sampling mechanism, and a sample storage mechanism is arranged on one side of the rectangular box body;

the rotary sampling mechanism comprises a hydraulic cylinder at one end of the upper surface of the rectangular box body, a first ball bearing is mounted at the telescopic end of the hydraulic cylinder, a sliding column is mounted at the inner ring of the first ball bearing, a rectangular hole is formed in the center of the sliding column, a sampling cylinder is mounted at the lower end of the sliding column, and a drill bit is mounted at the lower end of the sampling cylinder; a fixing ring is mounted at one end of the upper surface of the rectangular box body, a ball bearing II is mounted on an inner ring of the fixing ring, a connecting shaft is mounted on an inner ring of the ball bearing II, a rectangular shaft is mounted at the lower end of the connecting shaft, and the rectangular shaft is inserted into the rectangular hole; the sampling device comprises a sampling tube, a sliding column, a rectangular shaft, a connecting shaft and a sampling tube, wherein the center of the sliding column, the rectangular shaft, the connecting shaft and the sampling tube is respectively provided with a circular through hole, the inner side of the circular through hole is provided with a sliding rod, the sliding rod penetrates through the circular through hole, the lower end of the sliding rod is provided with a circular plate, the upper end of the sampling tube is provided with a spring groove, a tension spring is arranged between the spring groove and the circular plate, and the upper end of the connecting shaft is provided with a first bevel gear;

the active discharging mechanism comprises a connecting rod arranged at the upper end of the hydraulic cylinder, a rectangular column is arranged at one end of the connecting rod, a rectangular inclined plate is arranged at the lower end of the rectangular column, a rectangular through hole is formed in the center of the rectangular inclined plate, the rectangular inclined plate is connected with the rectangular column in a sliding mode, vertical bearings I are arranged at the two ends of the rectangular column, a reciprocating threaded shaft is arranged on the inner ring of each vertical bearing I, a bevel gear II is arranged at the lower end of each reciprocating threaded shaft, and an internal thread block meshed with the reciprocating threaded shaft is arranged at one end of the rectangular inclined plate;

the sample storage mechanism comprises a third ball bearing arranged at the center of the rectangular box body, a transmission shaft is arranged on the inner ring of the third ball bearing, a third bevel gear is arranged at the upper end of the transmission shaft, a rotating disc is arranged at the lower end of the transmission shaft, a first circular hole is formed in the upper surface of the rotating disc, a U-shaped groove is formed in the upper surface of the rotating disc, a containing cylinder is arranged on one side of the U-shaped groove, and the containing cylinder is connected with the U-shaped groove in a sliding mode; the upper surface of the rectangular box body is provided with a stepping motor, the rotating end of the stepping motor is provided with an output shaft, one end of the output shaft is provided with a first driving wheel meshed with the first bevel gear, the center of the output shaft is provided with a first limiting groove, the center of the output shaft is provided with a second driving wheel meshed with the second bevel gear, a first compression spring is arranged between the first driving wheel and the output shaft, the surfaces of two sides of the first driving wheel are provided with first permanent magnets, the upper surface of the rectangular box body is provided with a first electromagnet, and the positions of the first electromagnet and the first permanent magnets correspond; one end of the output shaft is provided with a second limiting groove, one end of the output shaft is provided with a third driving wheel meshed with the third bevel gear, a second compression spring is arranged between the third driving wheel and the output shaft, the surfaces of three sides of the driving wheel are provided with second permanent magnets, the upper surface of the rectangular box body is provided with a second electromagnet, and the position of the second electromagnet corresponds to that of the second permanent magnet.

Furthermore, the sample soil cutting mechanism comprises an arc-shaped groove formed in the lower end of the sampling cylinder, a swinging rod is installed at one end of the arc-shaped groove and hinged to the arc-shaped groove, a torsion spring is installed between the swinging rod and the arc-shaped groove, and a soil leakage hole I is formed in one side of the arc-shaped groove.

Furthermore, driving wheels are installed at four corners of the lower end of the rectangular box body.

Furthermore, the upper end of the sampling cylinder is provided with a second soil leakage hole.

Furthermore, a taking hole is formed in the side surface of the rectangular box body.

Furthermore, a second circular hole is formed in the lower surface of the rectangular box body.

Furthermore, a protective cover is arranged on the upper surface of the rectangular box body.

Furthermore, a fixed bearing is arranged on the upper surface of the rectangular box body.

The invention has the beneficial effects that: the soil layer can be quickly sampled by the rotation of the rotary drum under the action of the rotary sampling mechanism, the circular plate can move downwards through the work of the active discharging mechanism, and the soil sample is quickly separated from the sampling barrel, so that the manual operation is simplified, and the sampling efficiency is greatly improved; the rotating disc provided with a plurality of containing barrels can be rotated under the action of the sample storage mechanism, so that temporary storage is facilitated for a plurality of samples, soil sample pollution is avoided, and detection precision is indirectly improved.

Drawings

FIG. 1 is a schematic structural view of a sampling device for a road construction of the present invention;

FIG. 2 is a schematic view of a rotary sampling mechanism;

FIG. 3 is a schematic view of an active take-off mechanism;

FIG. 4 is an enlarged schematic view of the sampling tube;

FIG. 5 is a schematic top view of the turn disc;

FIG. 6 is a schematic side view of a cartridge;

FIG. 7 is a schematic cross-sectional view of a sampling tube;

FIG. 8 is a schematic view of a first limiting groove;

FIG. 9 is a schematic view of a second limiting groove;

in the figure, 1, a rectangular box body; 2. a hydraulic cylinder; 3. a first ball bearing; 4. a sliding post; 5. a rectangular hole; 6. a sampling tube; 7. a drill bit; 8. a fixing ring; 9. a ball bearing II; 10. a connecting shaft; 11. a rectangular shaft; 12. a circular through hole; 13. a slide bar; 14. a circular plate; 15. a spring slot; 16. an extension spring; 17. a first bevel gear; 18. a connecting rod; 19. a rectangular column; 20. a rectangular sloping plate; 21. a rectangular through hole; 22. a first vertical bearing; 23. a reciprocating threaded shaft; 24. a second bevel gear; 25. an internal thread block; 26. a ball bearing III; 27. a drive shaft; 28. a third bevel gear; 29. rotating the disc; 30. a first circular hole; 31. a U-shaped groove; 32. a containing cylinder; 33. a stepping motor; 34. an output shaft; 35. a first driving wheel; 36. a first limiting groove; 37. a second driving wheel; 38. a first compression spring; 39. a first permanent magnet; 40. an electromagnet I; 41. a second limiting groove; 42. a driving wheel III; 43. a second compression spring; 44. a second permanent magnet; 45. an electromagnet II; 46. an arc-shaped slot; 47. a swing lever; 48. a torsion spring; 49. a first soil leakage hole; 50. a drive wheel; 51. a second soil leakage hole; 52. taking the hole; 53. a second circular hole; 54. a protective cover; 55. and fixing the bearing.

Detailed Description

The invention is described in detail with reference to the accompanying drawings, and as shown in fig. 1-9, a bottom layer sampling device for highway construction comprises a rectangular box body 1, a sample soil cutting mechanism is arranged at the lower end of the rectangular box body 1, a rotary sampling mechanism is arranged at the lower end of the rectangular box body 1, an active discharging mechanism is arranged above the rotary sampling mechanism, and a sample storage mechanism is arranged at one side of the rectangular box body 1;

the rotary sampling mechanism comprises a hydraulic cylinder 2 at one end of the upper surface of a rectangular box body 1, a ball bearing I3 is mounted at the telescopic end of the hydraulic cylinder 2, a sliding column 4 is mounted on the inner ring of the ball bearing I3, a rectangular hole 5 is formed in the center of the sliding column 4, a sampling cylinder 6 is mounted at the lower end of the sliding column 4, and a drill bit 7 is mounted at the lower end of the sampling cylinder 6; a fixing ring 8 is mounted at one end of the upper surface of the rectangular box body 1, a ball bearing II 9 is mounted on an inner ring of the fixing ring 8, a connecting shaft 10 is mounted on an inner ring of the ball bearing II 9, a rectangular shaft 11 is mounted at the lower end of the connecting shaft 10, and the rectangular shaft 11 is inserted into the rectangular hole 5; the center of the sliding column 4, the rectangular shaft 11, the connecting shaft 10 and the sampling tube 6 is respectively provided with a circular through hole 12, the inner side of the circular through hole 12 is provided with a sliding rod 13, the sliding rod 13 penetrates through the circular through hole 12, the lower end of the sliding rod 13 is provided with a circular plate 14, the upper end of the sampling tube 6 is provided with a spring groove 15, a tension spring 16 is arranged between the spring groove 15 and the circular plate 14, and the upper end of the connecting shaft 10 is provided with a bevel gear I17;

the driving discharging mechanism comprises a connecting rod 18 arranged at the upper end of the hydraulic cylinder 2, one end of the connecting rod 18 is provided with a rectangular column 19, the lower end of the rectangular column 19 is provided with a rectangular inclined plate 20, the center of the rectangular inclined plate 20 is provided with a rectangular through hole 21, the rectangular inclined plate 20 is in sliding connection with the rectangular column 19, two ends of the rectangular column 19 are provided with a first vertical bearing 22, the inner ring of the first vertical bearing 22 is provided with a reciprocating threaded shaft 23, the lower end of the reciprocating threaded shaft 23 is provided with a second bevel gear 24, and one end of the rectangular inclined plate 20 is provided with an inner threaded block 25 meshed with the reciprocating threaded shaft 23;

the sample storage mechanism comprises a third ball bearing 26 arranged at the center of the rectangular box body 1, a transmission shaft 27 is arranged on the inner ring of the third ball bearing 26, a third bevel gear 28 is arranged at the upper end of the transmission shaft 27, a rotating disc 29 is arranged at the lower end of the transmission shaft 27, a first circular hole 30 is formed in the upper surface of the rotating disc 29, a U-shaped groove 31 is formed in the upper surface of the rotating disc 29, a containing cylinder 32 is arranged on one side of the U-shaped groove 31, and the containing cylinder 32 is in sliding connection with the U-shaped groove 31; the upper surface of the rectangular box body 1 is provided with a stepping motor 33, the rotating end of the stepping motor 33 is provided with an output shaft 34, one end of the output shaft 34 is provided with a first driving wheel 35 meshed with the first bevel gear 17, the center of the output shaft 34 is provided with a first limiting groove 36, the center of the output shaft 34 is provided with a second driving wheel 37 meshed with the second bevel gear 24, a first compression spring 38 is arranged between the second driving wheel 37 and the output shaft 34, the side surface of the second driving wheel 37 is provided with a first permanent magnet 39, the upper surface of the rectangular box body 1 is provided with a first electromagnet 40, and the first electromagnet 40 corresponds to the first permanent magnet 39 in position; one end of the output shaft 34 is provided with a second limit groove 41, one end of the output shaft 34 is provided with a third driving wheel 42 meshed with the third bevel gear 28, a second compression spring 43 is arranged between the third driving wheel 42 and the output shaft 34, a second permanent magnet 44 is arranged on the side surface of the third driving wheel 42, a second electromagnet 45 is arranged on the upper surface of the rectangular box body 1, and the position of the second electromagnet 45 corresponds to that of the second permanent magnet 44.

The sample soil dividing mechanism comprises an arc-shaped groove 46 formed in the lower end of the sampling barrel 6, a swinging rod 47 is installed at one end of the arc-shaped groove 46, the swinging rod 47 is hinged to the arc-shaped groove 46, a torsion spring 48 is installed between the swinging rod 47 and the arc-shaped groove 46, and a first soil leakage hole 49 is formed in one side of the arc-shaped groove 46.

The four corners of the lower end of the rectangular box body 1 are provided with driving wheels 50.

The upper end of the sampling tube 6 is provided with a second soil leakage hole 51.

The side surface of the rectangular box body 1 is provided with a taking hole 52.

The lower surface of the rectangular box body 1 is provided with a second round hole 53.

The upper surface of the rectangular box body 1 is provided with a protective cover 54.

The upper surface of the rectangular box body 1 is provided with a fixed bearing 55.

In the embodiment, the electric appliance of the device is controlled by an external controller, the rectangular box body 1 can be driven to move to a specified position by the rotation of the driving wheel 50, and the shape of the drill bit 7 is annular, so that the sampling cylinder 6 can cut a soil layer more conveniently; when the rectangular box body 1 moves to a designated position, the controller controls the stepping motor 33 to rotate, the stepping motor 33 drives the output shaft 34 and the driving wheel I35 to rotate, at the moment, the electromagnet I40 and the electromagnet II 45 are electrified, the driving wheel III 42 is indirectly separated from the bevel gear III 28, and the driving wheel II 37 is separated from the bevel gear II 24; the driving wheel I35 drives the bevel gear I17 to rotate, the bevel gear I17 rotates to drive the connecting shaft 10 to rotate, the connecting shaft 10 can stably rotate under the action of the fixing ring 8 and the ball bearing II 9, the connecting shaft 10 drives the rectangular shaft 11, the sliding column 4, the sampling cylinder 6 and the drill bit 7 to synchronously rotate, then the controller controls the hydraulic cylinder 2 to extend, the hydraulic cylinder 2 extends to drive the sampling cylinder 6 to contact with soil layers on the ground surface through the circular hole I30 and the circular hole II 53, the drill bit 7 can be driven to cut the soil layers along with the continuous extension of the hydraulic cylinder 2, the sampling cylinder 6 rotates anticlockwise at the moment, the oscillating rod 47 is contracted in the arc-shaped groove 46, and redundant soil residues can be discharged to the ground surface through the flow guide groove on the side surface of the sampling cylinder 6; the soil layer can be filled in the sampling cylinder 6 along with the continuous extension of the hydraulic cylinder 2, at the moment, the hydraulic cylinder 2 stops stretching, the stepping motor 33 reversely rotates to enable the sampling cylinder 6 to rotate clockwise to drive the swinging rod 47 to cut the soil layer in the horizontal direction at a fixed point, along with the continuous clockwise rotation of the sampling cylinder 6 and the swinging rod 47, the swinging rod 47 can move out of the arc-shaped groove 46 for a certain distance, the swinging rod 47 can cut the soil layer in a deeper layer, and finally the soil layer in the sampling cylinder 6 and the soil layer on the ground have a certain groove, so that the soil layer in the sampling cylinder 6 can be conveniently separated in the later period;

then the hydraulic cylinder 2 is controlled to contract, the hydraulic cylinder 2 contracts to drive the sampling cylinder 6 and the soil layer in the sampling cylinder 6 to move upwards and reset through the friction force between the sampling cylinder 6 and the soil layer, and the swinging rod 47 is still in a state of leaving the arc-shaped groove 46 for a certain distance at the moment, so that the soil layer in the sampling cylinder 6 can be supported to a certain extent to prevent the soil layer in the sampling cylinder 6 from sliding off too fast;

then the controller controls the second electromagnet 45 to be powered off, the second electromagnet 45 is powered off to enable the magnetic force between the second electromagnet 45 and the second permanent magnet 44 to disappear, the third driving wheel 42 can be meshed with the third bevel gear 28 under the action of the second compression spring 43, the stepping motor 33 indirectly drives the third driving wheel 42 to drive the third bevel gear 28 to rotate, the third bevel gear 28 rotates by 45 degrees, and the containing cylinder 32 is driven to move to the position under the sampling cylinder 6; then the electromagnet II 45 is electrified, the electromagnet I40 is powered off to enable the magnetic force between the electromagnet I40 and the permanent magnet I39 to disappear, the driving wheel II 37 and the bevel gear II 24 can be meshed through the action of the compression spring I38, the stepping motor 33 indirectly drives the bevel gear II 24 and the reciprocating threaded shaft 23 to rotate through rotation, the reciprocating threaded shaft 23 drives the inner thread block 25 and the rectangular inclined plate 20 to move downwards, the rectangular inclined plate 20 can stably move through the action of the rectangular column 19 and the rectangular through hole 21, the rectangular inclined plate 20 moves downwards to press the sliding rod 13 to move downwards, the sliding rod 13 drives the circular plate 14 to move downwards, the circular plate 14 presses the soil layer in the sampling cylinder 6 out of the containing cylinder 32 below, the circular plate 14 can be reset again through the characteristic of the reciprocating threaded shaft 23, then the electromagnet I40 is powered on, the electromagnet II 45 is powered off, the stepping motor 33 indirectly drives the circular hole I30 to rotate to the position right below the sampling cylinder 6, the sampling at the next time is convenient; after the sampling is finished through the operations, the containing cylinder 32 can be taken out through the taking hole 52;

the swinging rod 47 can be reset by the action of the torsion spring 48, and redundant soil can be discharged by the action of the first soil leakage hole 49 and the second soil leakage hole 51.

The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.