CN221074140U

CN221074140U - Colliery boring machine convenient to drill bit is changed

Info

Publication number: CN221074140U
Application number: CN202323101230.0U
Authority: CN
Inventors: 刘正超; 随贺; 方晓磊; 罗虎; 曹明; 王成; 吴刘洋; 肖怀
Original assignee: Anhui Hengyuan Coal Electricity Group Co Ltd
Current assignee: Anhui Hengyuan Coal Electricity Group Co Ltd
Priority date: 2023-11-14
Filing date: 2023-11-14
Publication date: 2024-06-04
Anticipated expiration: 2033-11-14

Abstract

The utility model discloses a coal mine drilling device convenient for bit replacement, which comprises a support frame and a drilling rod, wherein the drilling rod is used for drilling a coal mine; the driving assembly is arranged above the drilling rod and is used for providing driving force for the driving assembly; the drilling rod is connected with the driving assembly through the dismounting assembly, and the drilling rod can be replaced through the dismounting assembly; the angle modulation assembly is connected with the support frame and is connected with the driving assembly, and the angle modulation assembly is used for adjusting the drilling angle of the drilling rod. The utility model can disassemble and assemble the drilling rod by utilizing the disassembly and assembly, thereby being convenient for replacing the drilling rod, installing the drilling rods with different types, and simultaneously stabilizing the installation of the drilling rod by utilizing the disassembly plate, the disassembly plate and the assembly bolt and the disassembly bolt, and being convenient for the use of the drilling rod without idling during the use.

Description

Colliery boring machine convenient to drill bit is changed

Technical Field

The utility model relates to a coal mine drilling machine convenient for bit replacement.

Background

Coal mines are reasonable spaces that humans excavate when mining coal-rich geologic formations, and generally include roadways, shaft pits, and face formations, among others. Coal is a kind of combustible organic rock, and is formed by gradually accumulating thick layers of plant growing in a certain geological period in a proper geological environment, and burying the plant in water bottom or sediment and performing natural coalification in a long geological period. The carbon content of the coal is generally 46-97%, and the coal is brown to black and has a dull to metallic luster. Coal is classified into four types of peat, lignite, bituminous coal and anthracite coal according to the degree of coalification.

Because coal is the most dominant solid fuel, coal mines are required, currently, drills are generally used for mining coal mines, and when the drill bit is used, abrasion occurs due to contact with ore, but the drill bit of the existing drills is inconvenient to replace, and in the granted Chinese patent publication No.: CN214424439U, name: in the coal mine drilling equipment convenient to replace the drill bit, the drill bit is used by the cooperation of a bottom plate, a drilling equipment body, an octagonal fixing sleeve, a drill bit body, an octagonal transmission block, an annular fixing groove, a through groove, an L-shaped groove, a transmission mechanism and a fixing mechanism, when the drill bit body needs to be replaced, the transmission mechanism is pressed downwards, and when the transmission mechanism drives the fixing mechanism to be separated from the inside of the annular fixing groove, the drill bit body can be replaced, but when the drill bit is used, the drill bit is fixed by only using the octagonal fixing sleeve, so that the drill bit is easy to idle during use, and the drilling efficiency of the drill bit is affected.

Disclosure of utility model

The utility model aims to overcome the defects of inconvenient bit replacement and unstable fixation in the prior art, and provides a coal mine drilling machine convenient for bit replacement.

The utility model solves the technical problems by the following technical scheme:

the utility model provides a coal mine drilling machine which is convenient for replacing a drill bit, comprising a supporting frame,

The drilling rod is used for drilling a coal mine;

The driving assembly is arranged above the drilling rod and is used for providing driving force for the driving assembly;

The drilling rod is connected with the driving assembly through the dismounting assembly, and the drilling rod can be replaced through the dismounting assembly;

The angle modulation assembly is connected with the support frame and is connected with the driving assembly, and the angle modulation assembly is used for adjusting the drilling angle of the drilling rod.

In this technical scheme, utilize dismouting subassembly can carry out the dismouting to the drilling rod to the change of drilling rod of being convenient for, and can install the drilling rod of different models, utilize simultaneously to dismantle the board, tear down the board and cooperate mounting bolt and dismouting bolt can make the installation of drilling rod more stable, can not take place the condition of idle running when using, the use of the drilling rod of being convenient for is convenient for carry out the drilling to the colliery.

Preferably, the support frame comprises a bottom support plate, two symmetrically distributed side support plates are fixedly connected to the top of the bottom support plate, and a plurality of sliding wheel sets are mounted at the bottom of the bottom support plate.

In the technical scheme, the sliding wheel set is utilized to enable the movement of the drilling device to be more labor-saving and convenient.

Preferably, the dismounting assembly comprises a fixing plate and a mounting plate, wherein the fixing plate is connected with one end of the driving assembly, the mounting plate is connected with one end of the drilling rod, and the fixing plate is detachably connected with the mounting plate.

In this technical scheme, utilize fixed plate and mounting panel can connect drilling rod and drive assembly.

Preferably, the dismounting assembly further comprises dismounting plates, limiting blocks and mounting bolts, wherein the outer sides of the fixing plates and the mounting plates are arranged on the plurality of dismounting plates, the dismounting plates are in sliding connection with the fixing plates through the limiting blocks, and the dismounting plates are connected with the mounting plates through the mounting bolts;

The side surface of the fixed plate is provided with a sliding groove, and the limiting block is connected with the fixed plate through the sliding groove;

the section of the disassembling plate is of an L-shaped structure.

In this technical scheme, utilize dismantlement board and mounting bolt can install the drilling rod, and the position of dismantlement board can be adjusted to can enlarge the application scope of dismouting subassembly according to the mounted position of shape adjustment mounting bolt of mounting panel, increase the practicality.

Preferably, the dismounting assembly further comprises a dismounting plate and a dismounting bolt, a plurality of dismounting plates are arranged on the outer sides of the fixing plate and the mounting plate, the dismounting plates are connected with the mounting plate through the dismounting bolt, a connecting column is connected to the inner side of the dismounting plate, a limiting plate is fixedly connected to one end, away from the dismounting plate, of the connecting column, and the limiting plate is in sliding connection with the inner wall of the fixing plate;

the fixing plate is provided with three containing grooves distributed in an annular array, and limiting plates are arranged in the containing grooves;

The section of the disassembling plate is of an L-shaped structure.

In this technical scheme, utilize to tear open the board and dismantle the bolt and can dismantle the boring bar, the change of boring bar of being convenient for, the distance of board and fixed plate can be adjusted simultaneously to can fix the mounting panel of different diameters, thereby be convenient for change the boring bar of different models.

Preferably, the angle modulation assembly comprises a rotating shaft, two ends of the rotating shaft are respectively connected with the supporting frame in a rotating mode, rotating gears are fixedly connected to two ends of the rotating shaft, a rotating block is fixedly connected to the center of the rotating shaft, and a driving assembly is installed at the bottom of the rotating block.

In this technical scheme, utilize angle modulation subassembly can adjust the angle of boring bar to can carry out the drilling of different angles.

Preferably, an anti-rotation component is further arranged on one side of the angle modulation component, the anti-rotation component comprises a reinforcing plate and a protective shell, the reinforcing plate and the protective shell are both connected to one side of the support frame, two symmetrically distributed threaded columns are arranged between the reinforcing plate and the protective shell, two moving plates which are vertically symmetrically distributed are connected to the surfaces of the threaded columns in a threaded manner, and anti-rotation teeth are fixedly connected to one side, opposite to the two moving plates;

the anti-rotation teeth on the two sides are respectively arranged on the upper side and the lower side of the rotation gear.

In the technical scheme, the angle adjusting assembly can be limited by the anti-rotation assembly, so that the inclination angle of the drilling rod is limited, and the drilling rod is kept stable during drilling.

Preferably, three driving sprockets are arranged at the inner cavity of the protective shell, the three driving sprockets are in driving connection through driving chains, the driving chains in the middle are in driving connection with the output end of the rotating motor, the rotating motor is arranged on the inner wall of the protective shell, and the driving chains on two sides are connected with threaded columns.

In the technical scheme, the structure such as a rotary motor is utilized to provide driving force for the movement of the anti-rotation teeth.

Preferably, two symmetrically distributed rotating holes are formed in the top surface of the protective shell, and the top ends of the threaded columns penetrate through the rotating holes and are rotationally connected with the bottom surface of the reinforcing plate.

In the technical scheme, the bottom end of the threaded column can be connected with a driving chain wheel.

Preferably, the bottom of the driving chain wheel on two sides is fixedly connected with an auxiliary shaft, and the bottom end of the auxiliary shaft is rotationally connected with the bottom surface of the protective shell.

In this technical scheme, the auxiliary shaft can make the rotation of drive sprocket more stable.

On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the utility model.

The utility model has the positive progress effects that:

The application can disassemble and assemble the drilling rod by utilizing the disassembly and assembly, thereby being convenient for replacing the drilling rod, installing the drilling rods with different types, and simultaneously stabilizing the installation of the drilling rod by utilizing the disassembly plate, the disassembly plate and the assembly bolt and the disassembly bolt, avoiding the idle running during the use, being convenient for using the drilling rod and being convenient for drilling the coal mine.

Drawings

Fig. 1 is a schematic diagram of a coal mine drill that facilitates bit replacement according to an embodiment of the present utility model.

Fig. 2 is a schematic view illustrating an internal structure of the coal mine drill of fig. 1, which facilitates replacement of a drill bit.

Fig. 3 is a schematic side view of the coal mine drill of fig. 1 for facilitating bit replacement.

FIG. 4 is a schematic side view of an anti-rotation assembly of the coal mine drill of FIG. 1 for facilitating bit replacement.

Fig. 5 is a schematic top view of the positional relationship between the fixing plate, the detaching plate and the stopper of the coal mine drill of fig. 1, which facilitates the replacement of the drill bit.

FIG. 6 is a schematic side view of the positional relationship between the mounting plate, dismounting bolt, connecting post, limiting plate and drilling rod of the coal mine drill of FIG. 1 for facilitating bit replacement;

Fig. 7 is a schematic plan view of the positional relationship among the fixing plate, the dismounting plate, the connecting column, the limiting plate and the drilling rod of the coal mine drilling machine of fig. 1, which facilitates the replacement of the drill bit.

Description of the reference numerals

1. A support frame; 11. a bottom support plate; 12. a side support plate; 13. a sliding wheel set;

2. A drill rod;

3. A drive assembly;

4. Disassembling and assembling the assembly; 41. a fixing plate; 42. a mounting plate; 43. disassembling the plate; 44. a limiting block; 45. installing a bolt; 46. disassembling the plate; 47. disassembling and assembling the bolts; 48. a connecting column; 49. a limiting plate;

5. An angle adjusting component; 51. a rotating shaft; 52. rotating the gear; 53. a rotating block;

6. An anti-rotation assembly; 61. a reinforcing plate; 62. a protective housing; 63. a threaded column; 64. a moving plate; 65. anti-rotation teeth; 66. a drive sprocket; 67. a drive chain; 68. and rotating the motor.

Detailed Description

The utility model is further illustrated by means of the following examples, which are not intended to limit the scope of the utility model.

Fig. 1 to 5 are schematic structural views showing a first embodiment of a coal mine drill which facilitates bit replacement according to the present utility model. The coal mine drilling machine convenient for bit replacement comprises a supporting frame 1,

A drill rod 2, the drill rod 2 being used to drill a coal mine;

A driving assembly 3, wherein the driving assembly 3 is arranged above the drilling rod 2, and the driving assembly 3 is used for providing driving force for the driving assembly 3;

The drilling rod 2 is connected with the driving assembly 3 through the dismounting assembly 4, and the drilling rod 2 can be replaced through the dismounting assembly 4;

The angle modulation assembly 5, angle modulation assembly 5 is connected with support frame 1, just angle modulation assembly 5 is connected with drive assembly 3, angle modulation assembly 5 is used for adjusting the drilling angle of boring bar 2.

In this technical scheme, utilize dismouting subassembly 4 can carry out the dismouting to drilling rod 2 to the change of drilling rod 2 of being convenient for, and can install the drilling rod 2 of different models, utilize simultaneously dismantlement board 43, dismouting board 46 and cooperation mounting bolt 45 and dismouting bolt 47 can make the installation of drilling rod 2 more stable, the condition of idle running can not take place when using, the use of drilling rod 2 of being convenient for, the drilling is carried out the colliery to the convenience.

The support frame 1 comprises a bottom support plate 11, two symmetrically distributed side support plates 12 are fixedly connected to the top of the bottom support plate 11, and a plurality of sliding wheel sets 13 are arranged at the bottom of the bottom support plate 11.

In the technical scheme, the sliding wheel set 13 is utilized to enable the movement of the driller to be more labor-saving and convenient.

The dismounting assembly 4 comprises a fixing plate 41 and a mounting plate 42, the fixing plate 41 is connected with one end of the driving assembly 3, the mounting plate 42 is connected with one end of the drilling rod 2, and the fixing plate 41 is detachably connected with the mounting plate 42.

In the present solution, the drill rod 2 and the drive assembly 3 may be connected by means of a fixing plate 41 and a mounting plate 42.

The dismounting assembly 4 further comprises dismounting plates 43, limiting blocks 44 and mounting bolts 45, the outer sides of the fixing plates 41 and the mounting plates 42 are arranged on the plurality of dismounting plates 43, the dismounting plates 43 are in sliding connection with the fixing plates 41 through the limiting blocks 44, and the dismounting plates 43 are connected with the mounting plates 42 through the mounting bolts 45;

the side surface of the fixed plate 41 is provided with a sliding groove, and the limiting block 44 is connected with the fixed plate 41 through the sliding groove;

the section of the detaching plate 43 is an L-shaped structure.

In this technical scheme, utilize dismantlement board 43 and mounting bolt 45 can install drilling rod 2, and dismantlement board 43's position can be adjusted to can enlarge the application scope of dismouting subassembly 4 according to the mounted position of mounting bolt 45 of the shape adjustment of mounting panel 42, increase the practicality.

When the drill rod is replaced, the mounting plate 42 is attached to the bottom of the fixing plate 41, then the plurality of dismounting plates 43 are respectively rotated, the dismounting plates 43 are moved to different positions according to the shape of the mounting plate 42, the dismounting plates 43 and the mounting plate 42 are connected by using the mounting bolts 45, so that the mounting of the mounting plate 42 is completed, the mounting of the drill rod 2 is further completed, and the opposite mode is utilized during the dismounting.

The angle modulation assembly 5 comprises a rotating shaft 51, two ends of the rotating shaft 51 are respectively connected with the support frame 1 in a rotating mode, rotating gears 52 are fixedly connected to two ends of the rotating shaft 51, a rotating block 53 is fixedly connected to the center of the rotating shaft 51, and a driving assembly 3 is installed at the bottom of the rotating block 53.

In this technical scheme, the angle of the drilling rod 2 can be adjusted by using the angle adjusting assembly 5, so that drilling at different angles can be performed.

When the angle of the drilling rod 2 needs to be adjusted, the anti-rotation tooth 65 is firstly ensured to be far away from the rotation gear 52, and then the rotation gear 52 or the rotation shaft 51 is rotated, so that the rotation block 53 can be driven to rotate, and the drilling rod 2 can be driven to rotate at the moment, so that the angle of the drilling rod 2 is adjusted.

The angle modulation assembly 5 is further provided with an anti-rotation assembly 6 on one side, the anti-rotation assembly 6 comprises a reinforcing plate 61 and a protective shell 62, the reinforcing plate 61 and the protective shell 62 are both connected to one side of the support frame 1, two symmetrically distributed threaded columns 63 are arranged between the reinforcing plate 61 and the protective shell 62, two moving plates 64 which are vertically symmetrically distributed are connected to the surfaces of the threaded columns 63 in a threaded manner, and anti-rotation teeth 65 are fixedly connected to one side, opposite to the two moving plates 64;

The anti-rotation teeth 65 are respectively disposed on the upper and lower sides of the rotation gear 52.

In the technical scheme, the rotation prevention assembly 6 can be used for limiting the angle adjusting assembly 5, so that the inclination angle of the drilling rod 2 is limited, and the drilling rod 2 is kept stable during drilling.

After the angle of the drilling rod 2 is adjusted, the threaded column 63 is rotated, so that the moving plates 64 on two sides are driven to move in opposite directions, and the anti-rotation teeth 65 can be driven to move in the same direction, so that the anti-rotation teeth 65 are tightly attached to the rotating gear 52, the angle of the rotating gear 52 is limited, the rotating gear 52 is prevented from rotating, and the angle of the drilling rod 2 is limited.

Three driving chain wheels 66 are arranged at the inner cavity of the protective shell 62, the three driving chain wheels 66 are in driving connection through driving chains 67, the driving chains 67 in the middle are in driving connection with the output end of a rotating motor 68, the rotating motor 68 is arranged on the inner wall of the protective shell 62, and the driving chains 67 on two sides are connected with threaded columns 63.

In this embodiment, the rotation preventing teeth 65 can be moved by the rotation motor 68 or the like.

When in use, the rotary motor 68 drives the corresponding drive sprocket 66 to rotate, thereby driving the drive chain 67 to rotate, at the moment, the drive sprocket 66 on two sides can be driven to rotate, and the drive sprocket 66 on two sides can drive the threaded column 63 to rotate when rotating, so as to provide driving force for the movement of the moving plate 64 and the anti-rotation teeth 65.

Two symmetrically distributed rotating holes are formed in the top surface of the protective shell 62, and the top ends of the threaded columns 63 penetrate through the rotating holes and are in rotating connection with the bottom surface of the reinforcing plate 61.

In this embodiment, the bottom end of the threaded post 63 is connected to a drive sprocket 66.

The bottom of the driving sprocket 66 on both sides is fixedly connected with an auxiliary shaft, and the bottom end of the auxiliary shaft is rotatably connected with the bottom surface of the protective housing 62.

In this embodiment, the auxiliary shaft may stabilize the rotation of the drive sprocket 66.

As another embodiment of the present application, as shown in fig. 6 and 7, the difference between the present embodiment and the first embodiment is that the dismounting assembly 4 further includes a dismounting plate 46 and a dismounting bolt 47, a plurality of dismounting plates 46 are disposed on the outer sides of the fixing plate 41 and the mounting plate 42, the dismounting plates 46 are connected with the mounting plate 42 through the dismounting bolts 47, a connecting column 48 is connected on the inner side of the dismounting plates 46, a limiting plate 49 is fixedly connected to one end of the connecting column 48 away from the dismounting plate 46, and the limiting plate 49 is slidably connected with the inner wall of the fixing plate 41;

the fixing plate 41 is provided with three containing grooves distributed in an annular array, and limiting plates 49 are arranged in the containing grooves;

The cross section of the detachable plate 46 is L-shaped.

In this technical scheme, utilize tear frock board 46 and dismouting bolt 47 to can carry out the dismouting to drilling rod 2, the change of drilling rod 2 of being convenient for, the distance of tear frock board 46 and fixed plate 41 can be adjusted simultaneously to can fix the mounting panel 42 of different diameters, thereby be convenient for change the drilling rod 2 of different models.

During replacement, according to the model of the drilling rod 2, namely according to the diameter of the mounting plate 42, the dismounting plate 46 is moved, so that the connecting column 48 and the limiting plate 49 move in the fixing plate 41, the position of the dismounting plate 46 is adjusted, then the mounting plate 42 is placed on the bottom side of the fixing plate 41, then the dismounting plate 46 is slid, the inner side of the dismounting plate 46 is tightly attached to the side face of the mounting plate 42, then the dismounting plate 46 is connected with the mounting plate 42 by utilizing the dismounting bolt 47, and accordingly the drilling rod 2 is mounted.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.

Claims

1. The utility model provides a colliery rig convenient to drill bit changes, includes support frame (1), its characterized in that, colliery rig convenient to drill bit changes still includes: a drilling rod (2), the drilling rod (2) being used for drilling a coal mine;

The driving assembly (3) is arranged above the drilling rod (2), and the driving assembly (3) is used for providing driving force for the driving assembly (3);

the drilling rod (2) is connected with the driving assembly (3) through the dismounting assembly (4), and the drilling rod (2) can be replaced through the dismounting assembly (4);

The angle modulation assembly (5), angle modulation assembly (5) are connected with support frame (1), just angle modulation assembly (5) are connected with drive assembly (3), angle modulation assembly (5) are used for adjusting the drilling angle of boring a rod (2).

2. A coal mine drill facilitating bit replacement as claimed in claim 1, wherein: the support frame (1) comprises a bottom support plate (11), two symmetrically distributed side support plates (12) are fixedly connected to the top of the bottom support plate (11), and a plurality of sliding wheel sets (13) are arranged at the bottom of the bottom support plate (11).

3. A coal mine drill facilitating bit replacement as claimed in claim 1, wherein: the dismounting assembly (4) comprises a fixing plate (41) and a mounting plate (42), wherein the fixing plate (41) is connected with one end of the driving assembly (3), the mounting plate (42) is connected with one end of the drilling rod (2), and the fixing plate (41) is detachably connected with the mounting plate (42).

4. A coal mine drill facilitating bit replacement as claimed in claim 3, wherein: the dismounting assembly (4) further comprises dismounting plates (43), limiting blocks (44) and mounting bolts (45), the outer sides of the fixing plates (41) and the mounting plates (42) are arranged on the plurality of dismounting plates (43), the dismounting plates (43) are in sliding connection with the fixing plates (41) through the limiting blocks (44), and the dismounting plates (43) are connected with the mounting plates (42) through the mounting bolts (45);

The side surface of the fixed plate (41) is provided with a sliding groove, and the limiting block (44) is connected with the fixed plate (41) through the sliding groove;

the section of the disassembling plate (43) is of an L-shaped structure.

5. A coal mine drill facilitating bit replacement as claimed in claim 3, wherein: the dismounting assembly (4) further comprises a dismounting plate (46) and dismounting bolts (47), a plurality of dismounting plates (46) are arranged on the outer sides of the fixing plate (41) and the mounting plate (42), the dismounting plate (46) is connected with the mounting plate (42) through the dismounting bolts (47), a connecting column (48) is connected to the inner side of the dismounting plate (46), a limiting plate (49) is fixedly connected to one end, far away from the dismounting plate (46), of the connecting column (48), and the limiting plate (49) is in sliding connection with the inner wall of the fixing plate (41);

Three containing grooves distributed in an annular array are formed in the fixing plate (41), and limiting plates (49) are arranged in the containing grooves;

The section of the dismounting plate (46) is of an L-shaped structure.

6. A coal mine drill facilitating bit replacement as claimed in claim 1, wherein: the angle adjusting assembly (5) comprises a rotating shaft (51), two ends of the rotating shaft (51) are respectively connected with the supporting frame (1) in a rotating mode, rotating gears (52) are fixedly connected to two ends of the rotating shaft (51), a rotating block (53) is fixedly connected to the center of the rotating shaft (51), and a driving assembly (3) is arranged at the bottom of the rotating block (53).

7. The coal mine drill facilitating bit replacement of claim 6, wherein: the angle modulation assembly is characterized in that an anti-rotation assembly (6) is further arranged on one side of the angle modulation assembly (5), the anti-rotation assembly (6) comprises a reinforcing plate (61) and a protective shell (62), the reinforcing plate (61) and the protective shell (62) are connected to one side of the support frame (1), two symmetrically distributed threaded columns (63) are arranged at positions between the reinforcing plate (61) and the protective shell (62), two movable plates (64) which are symmetrically distributed up and down are connected to the surfaces of the threaded columns (63) in a threaded manner, and anti-rotation teeth (65) are fixedly connected to one side, opposite to the movable plates (64);

The anti-rotation teeth (65) on the two sides are respectively arranged on the upper side and the lower side of the rotation gear (52).

8. The coal mine drill facilitating bit replacement of claim 7, wherein: three driving chain wheels (66) are arranged at the inner cavity of the protective shell (62), the three driving chain wheels (66) are in transmission connection through driving chains (67), the driving chains (67) in the middle are in transmission connection with the output end of a rotating motor (68), the rotating motor (68) is mounted on the inner wall of the protective shell (62), and threaded columns (63) are connected to the driving chains (67) on two sides.

9. The coal mine drill facilitating bit replacement of claim 8, wherein: two symmetrically distributed rotating holes are formed in the top surface of the protective shell (62), and the top ends of the threaded columns (63) penetrate through the rotating holes and are rotationally connected with the bottom surface of the reinforcing plate (61).

10. The coal mine drill facilitating bit replacement of claim 8, wherein: the bottom of the driving chain wheel (66) on two sides is fixedly connected with an auxiliary shaft, and the bottom end of the auxiliary shaft is rotationally connected with the bottom surface of the protective shell (62).