Punching and film expanding device for tobacco field

Abstract

The utility model discloses a punching and film expanding device for a tobacco field. The punching and film expanding device comprises a drill bit, a mounting part and a film expanding part, the drill bit is provided with a drilling end and a connecting end, and the drilling end is used for breaking soil; the mounting part is movably mounted at the connecting end, and the moving direction of the mounting part coincides with the arrangement direction of the connecting end and the drilling end; the film expanding part comprises a cutting knife and an elastic piece, the cutting knife is installed on the installation part and located on the side, close to the drill bit end, of the installation part, the distance between the cutting knife and the axis of the drilling end is larger than the outer diameter of the drilling end, and the elastic piece is connected with the installation part and the connecting end. According to the scheme, the mulching film breaking capacity of the cutting knife is improved instead of breaking the mulching film purely depending on the self weight of the mounting part and the cutting knife, the mulching film cutting capacity of the device is improved, well pits with different depths can be formed, film expansion can be achieved, and then the situation that tobacco leaves are scalded due to the fact that the opening size of the mulching film is too small is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of tobacco field perforation equipment, specifically to a tobacco field perforation and film expansion device. Background Technology

[0002] When transplanting tobacco seedlings, holes are usually made in the mulch film in the tobacco field using a punching device. To prevent the tobacco leaves from being scalded at the opening of the mulch film on the ridge, a cutting blade is usually installed at the top of the drill bit, and the outer diameter of the cutting blade is set to be larger than the outer diameter of the drill bit to increase the size of the mulch film opening.

[0003] Publication number CN221468307U discloses a portable perforator for tobacco seedling transplanting, comprising a drill bit, a film-breaking blade, and a fixing sleeve. A limiting opening is formed along the height direction on the cylindrical section of the drill bit. The film-breaking blade is mounted on the fixing sleeve, which has a through hole. A fastening screw is installed in the through hole, with its inner end extending into the limiting opening. Thus, when the drill bit is drilling, the fixing sleeve can be guided up and down within the limiting opening via the fastening screw, preventing interference between the fixing sleeve and the ground when the drill bit is drilling at different depths. The film-breaking blade also helps to puncture the mulch film, thereby increasing the opening size.

[0004] However, when the required well depth is within the travel range of the patented limiting port, the film is cut by the weight of the fixing sleeve and the film-breaking knife alone because the fastening screw is not limited in the vertical direction. If the blade is stuck with soil or worn, its weight is insufficient to cut the film, resulting in incomplete cutting. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a perforation and film expansion device for tobacco fields. This device solves the technical problem in the prior art where, when the required well depth is within the stroke of the patented limiting port, the fastening screw is not limited in the vertical direction. At this time, the film is cut by the weight of the fixing sleeve and the film-breaking knife alone. If the blade is stuck with soil or worn, its weight is insufficient to cut the film, resulting in incomplete cutting.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a device for perforating and expanding film in tobacco fields, comprising:

[0008] A drill bit having a drilling end and a connecting end, wherein the drilling end is used for breaking soil;

[0009] The mounting part is movably mounted on the connecting end, and its direction of movement coincides with the arrangement direction of the connecting end and the drilling end; and

[0010] The expanding section includes a cutting blade and an elastic element. The cutting blade is mounted on the mounting section and located on the side of the mounting section near the drill bit end. The distance between the cutting blade and the axis of the drill hole end is greater than the outer diameter of the drill hole end. The elastic element connects the mounting section and the connecting end.

[0011] In some embodiments, the connecting end has a guide arm extending in a direction away from the drill end;

[0012] The mounting part has a guide channel and is slidably sleeved onto the guide arm through the guide channel.

[0013] In some embodiments, the tobacco field perforation and film expansion device further includes a drive arm, a handle, and a stop portion. The drive arm is detachably connected to the guide arm and extends in a direction away from the guide arm. The handle is connected to the end of the drive arm away from the guide arm, and the stop portion is installed at the end of the drive arm close to the guide arm.

[0014] The elastic element includes a compression spring, which is sleeved on the outside of the guide arm and located between the mounting part and the stop part.

[0015] In some embodiments, the mounting portion includes a guide sleeve and a mounting plate. The guide sleeve is sleeved outside the guide arm and connected to the connecting end via the elastic element, and its internal channel forms the guide channel. The mounting plate is circumferentially disposed outside the guide sleeve, and the end of the plate away from the guide sleeve is used for mounting the cutting blade.

[0016] The cutting blades are provided in multiples, and the multiple cutting blades are arranged at intervals along the circumference of the mounting plate.

[0017] In some embodiments, each of the cutting blades is movable relative to the mounting plate in directions approaching and away from the guide sleeve;

[0018] The film expansion section further includes a driving member, which is mounted on the guide sleeve or the mounting plate and connected to a plurality of cutting blades. The driving member is used to drive each cutting blade to move in a direction close to and away from the guide sleeve, and can maintain the cutting blade at any position within its stroke.

[0019] In some embodiments, the mounting plate is provided with a plurality of grooves, each groove extending through the mounting plate in a direction close to the drill bit end, the plurality of grooves corresponding one-to-one with a plurality of cutting blades, and each cutting blade having a transmission arm passing through the corresponding groove;

[0020] The driving component includes a driving sleeve and a locking structure. The driving sleeve is sleeved outside the guide sleeve and can move axially relative to the guide sleeve. Its outer wall gradually expands in the direction away from the drill end and forms an annular pressing surface. The annular pressing surface slides against the transmission arm. The locking structure is located between the driving sleeve and the guide sleeve and is used to lock the driving sleeve to the guide sleeve and can unlock the driving sleeve.

[0021] In some embodiments, the locking structures are respectively threads provided on the outer wall of the guide sleeve and the inner wall of the drive sleeve, so that the guide sleeve and the drive sleeve are threadedly engaged.

[0022] In some embodiments, the side wall of the drive sleeve is provided with a limiting screw hole;

[0023] The driving component also includes a limiting bolt, which is threadedly connected to the driving sleeve via the limiting screw hole and can press against the guide sleeve.

[0024] In some embodiments, the drive element further includes a connecting spring that connects the drive arm and the mounting plate, for driving the cutting blade toward the guide sleeve.

[0025] In some embodiments, the drive sleeve includes a pressing section and a drive section, the pressing section and the drive section being connected sequentially in a direction away from the drill end, the drive section being cylindrical and having anti-slip stripes on its outer wall;

[0026] The annular pressing surface is formed in the pressing section.

[0027] Compared with existing technologies, the tobacco field drilling and film expansion device provided by this utility model connects the installation part to the drill bit's connecting end via an elastic element. Thus, when the drill bit's drilling end breaks through the soil and extends into the ground to create a hole, the installation part is stopped at the ground surface. As the drill bit continues to move downwards, the installation part compresses the elastic element until the drilling depth reaches a preset value. During this process, the compression of the elastic element applies a downward elastic force to the installation part, thereby increasing the cutting blade's ability to break the film, rather than relying solely on the weight of the installation part and the cutting blade to break the film. This improves the device's ability to cut the film, and based on the elastic expansion and contraction of the elastic element, it can create wells and pits of different depths.

[0028] Meanwhile, since the cutting blade is located at the installation end, it is positioned on the outer side of the drill bit in the horizontal direction. As a result, when rotating to cut the film, the inner diameter of the film opening made by the cutting blade is larger than the inner diameter of the well, thus expanding the film and effectively preventing the tobacco leaves from being scalded due to the film opening size being too small. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the tobacco field perforation and film expansion device provided in this embodiment of the utility model;

[0030] Figure 2 yes Figure 1 A partial schematic diagram of the perforation and film expansion device in China Tobacco Field.

[0031] Figure 3 yes Figure 2 Exploded view of the perforation and expansion device at China Tobacco Field;

[0032] Figure 4 yes Figure 2 Schematic diagram of the drill bit, mounting section and drive sleeve;

[0033] Figure 5 yes Figure 4 A schematic diagram of the drive sleeve;

[0034] Figure 6 yes Figure 2 A schematic diagram of the mounting section, the cutting blade, and the connecting spring.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Drill bit; 11. Drilling end; 12. Connecting end; 13. Guide arm; 131. Limiting slide rail; 2. Mounting part; 2a. Guide channel; 21. Mounting end; 22. Guide sleeve; 22a. Limiting groove; 23. Mounting plate; 23a. Slide groove; 3. Expanding part; 31. Cutting knife; 311. Transmission arm; 32. Elastic element; 321. Compression spring; 33. Driving element; 331. Driving sleeve; 331a. Limiting screw hole; 332. Locking structure; 333. Annular pressing surface; 334. Limiting bolt; 335. Connecting spring; 336. Pressing section; 337. Driving section; 4. Driving arm; 5. Handle; 6. Stopping part. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] To address the technical problem in existing technologies where, when the required depth of the pit is within the travel range of the patented limiting opening, the fastening screw is not vertically limited, and the film is cut solely by the weight of the fixing sleeve and the film-breaking blade. If the blade is adhered to by soil or worn, its weight is insufficient to cut the film, leading to incomplete cutting. This invention provides a tobacco field perforation and film-expanding device that increases the cutting blade's ability to break the film, rather than relying solely on the weight of the mounting part and the cutting blade. This improves the device's ability to cut the film and allows for the creation of pits of varying depths. Furthermore, the inner diameter of the opening made by the cutting blade is larger than the inner diameter of the pit, thus expanding the film and effectively preventing the tobacco leaves from being scalded by an excessively small opening in the film.

[0039] Please see Figures 1 to 3 , Figures 1 to 3 This is a schematic diagram of the structure of a tobacco field drilling and expanding film device according to one embodiment of the present invention. The tobacco field drilling and expanding film device includes a drill bit 1, a mounting part 2, and an expanding film part 3. The drill bit 1 has a drilling end 11 and a connecting end 12. The drilling end 11 is used for breaking the soil. The mounting part 2 is movably mounted on the connecting end 12, and its direction of movement coincides with the arrangement direction of the connecting end 12 and the drilling end 11. The expanding film part 3 includes a cutting blade 31 and an elastic element 32. The cutting blade 31 is mounted on the mounting part 2 and is located on the side of the mounting part 2 near the end of the drill bit 1. The distance between the axis of the cutting blade 31 and the drilling end 11 is greater than the outer diameter of the drilling end 11. The elastic element 32 connects the mounting part 2 and the connecting end 12. Specifically, in this embodiment, the mounting part 2 has a mounting end 21, which is located outside the drill bit 1 and intersects the arrangement direction of the connecting end 12 with the direction of movement of the mounting part 2. The cutting blade 31 is mounted on the mounting end 21.

[0040] In the tobacco field drilling and film expansion device provided by this utility model, the mounting part 2 is connected to the connecting end 12 of the drill bit 1 via an elastic element 32. Thus, when the drilling end 11 of the drill bit 1 breaks through the soil and extends into the ground to open a hole, the mounting part 2 is stopped at the ground surface. As the drill bit 1 continues to move downwards, the mounting part 2 compresses the elastic element 32 until the drilling depth reaches a preset value. During this process, because the elastic element 32 is compressed, it applies a downward elastic force to the mounting part 2, thereby increasing the ability of the cutting blade 31 to break the film, rather than relying solely on the weight of the mounting part 2 and the cutting blade 31 to break the film. This improves the device's ability to cut the film, and based on the elastic expansion and contraction of the elastic element 32, it can open wells and pits of different depths.

[0041] Meanwhile, since the cutting blade 31 is located at the mounting end 21, the cutting blade 31 is located on the outer side of the drill bit 1 in the horizontal direction. Therefore, when rotating to cut the film, the inner diameter of the film opening made by the cutting blade 31 is larger than the inner diameter of the well, thereby expanding the film and effectively avoiding the scalding of the tobacco leaves due to the small opening size of the film.

[0042] In one embodiment, the connecting end 12 extends a guide arm 13 in a direction away from the drilling end 11; the mounting part 2 has a guide channel 2a and is slidably sleeved on the guide arm 13 via the guide channel 2a.

[0043] In this embodiment, the mounting part 2 is sleeved on the guide arm 13 of the connecting end 12 through the guide channel 2a, so that the mounting part 2 can move stably, avoid the mounting part 2 from causing the cutting blade 31 to deviate, and improve the film breaking effect of the cutting blade 31.

[0044] It should be noted that the tobacco field drilling and film expansion device can be equipped with a hydraulic rod or an electric actuator, with its movable end connected to the guide arm 13 to drive the guide arm 13 to move towards the ground. Alternatively, a drive arm 4 can be installed, and the drill bit 1 can be manually driven to move down to break the soil and rotate to cut the film.

[0045] In one embodiment, the tobacco field perforation and film expansion device further includes a drive arm 4, a handle 5, and a stop 6. The drive arm 4 is detachably connected to the guide arm 13 and extends in a direction away from the guide arm 13. The handle 5 is connected to the end of the drive arm 4 away from the guide arm 13. The stop 6 is installed at the end of the drive arm 4 near the guide arm 13. The elastic element 32 includes a compression spring 321, which is sleeved on the outside of the guide arm 13 and located between the mounting part 2 and the stop 6.

[0046] In this embodiment, the worker holds the handle 5 and lowers the drill bit 1 to make a hole. Since the drive arm 4 and guide arm 13 are detachably connected, when the spring force of the compression spring 321 decreases, the drive arm 4 can be disassembled and a new compression spring 321 can be replaced, ensuring the membrane breaking effect.

[0047] It should be noted that the drive arm 4 and the guide arm 13 can be detachably connected via threads, snaps, or pins. Furthermore, the stop part 6 can be configured as a stop plate, a stop ring, or a stop bolt. Specifically, in this design, the drive arm 4 and the guide arm 13 are connected via threads. The stop part 6 is configured as a stop ring to improve the limiting stability of the compression spring 321.

[0048] It should be noted that the mounting part 2 can be configured as a mounting plate, mounting arm or other forms.

[0049] In one embodiment, please refer to Figure 3 and Figure 4 The mounting part 2 includes a guide sleeve 22 and a mounting plate 23. The guide sleeve 22 is sleeved on the outside of the guide arm 13 and connected to the connecting end 12 via an elastic member 32. Its internal channel forms a guide channel 2a. The mounting plate 23 is arranged around the outside of the guide sleeve 22, and its end away from the guide sleeve 22 forms a mounting end 21. Multiple cutting blades 31 are provided, and the multiple cutting blades 31 are arranged at intervals along the circumference of the mounting plate 23.

[0050] In this embodiment, the mounting part 2 is configured as a guide sleeve 22 and a mounting plate 23. Since the mounting plate 23 is arranged in a ring, multiple cutting blades 31 can be arranged at intervals along the circumference of the mounting plate 23, thereby improving space utilization and further improving the film breaking ability of the device.

[0051] In one embodiment, each cutting blade 31 is movable relative to the mounting plate 23 in a direction approaching and moving away from the guide sleeve 22; the film expansion section 3 also includes a drive member 33, which is mounted on the guide sleeve 22 or the mounting plate 23 and connected to a plurality of cutting blades 31, for driving each cutting blade 31 to move in a direction approaching and moving away from the guide sleeve 22, and can maintain the cutting blade 31 at any position in its active stroke.

[0052] In this embodiment, the driving component 33 drives the cutting blade 31 to move in a direction away from the guide sleeve 22, thereby flexibly adjusting the inner diameter of the opening of the film by the cutting blade 31 and further improving the practicality of the device. It should be noted that the driving component 33 can be configured as multiple hydraulic rods, electric actuators, or linear motors, and correspond one-to-one with multiple cutting blades 31.

[0053] In one embodiment, the mounting plate 23 is provided with a plurality of grooves 23a, each groove 23a passing through the mounting plate 23 in a direction close to the drill bit 1. The plurality of grooves 23a correspond one-to-one with a plurality of cutting blades 31, and each cutting blade 31 has a transmission arm 311 passing through the corresponding groove 23a. The driving member 33 includes a driving sleeve 331 and a locking structure 332. The driving sleeve 331 is sleeved on the outside of the guide sleeve 22 and can move relative to the guide sleeve 22 along its axial direction. Its outer wall is gradually widened in a direction away from the drill end 11 and forms an annular pressing surface 333. The annular pressing surface 333 slides against the transmission arm 311. The locking structure 332 is provided between the driving sleeve 331 and the guide sleeve 22 for locking the driving sleeve 331 to the guide sleeve 22 and for unlocking the driving sleeve 331.

[0054] In this embodiment, the annular pressing surface 333 of the driving sleeve 331 drives the transmission arm 311 to move the cutting blade 31 in a direction away from or towards the guide sleeve 22. This allows for the synchronous adjustment of multiple cutting blades 31 by moving the driving sleeve 331 up and down, improving convenience. It should be noted that in one embodiment, the driving sleeve 331 and the transmission arm 311 are magnetically connected. Furthermore, the width of the cutting blade 31 is greater than the width of the slide groove 23a, and a pin hole is provided on the upper side of the transmission arm 311. The cutting blade 31 is inserted into the pin hole to prevent it from disengaging from below into the slide groove 23a.

[0055] Furthermore, it should be noted that in one embodiment, the locking structure 332 is set as an electromagnet on the guide channel 2a, and the drive sleeve 331 is slidably disposed on the electromagnet. When the drive sleeve 331 slides to a preset position, the electromagnet is activated to restrict its movement. In another embodiment, a groove is provided on the drive sleeve 331 along its axial direction, the drive sleeve 331 is disposed in the groove, and locking and unlocking of the drive sleeve 331 are achieved by screwing it to the side wall of the groove.

[0056] In one embodiment, the locking structure 332 is provided with threads on the outer wall of the guide sleeve 22 and the inner wall of the drive sleeve 331, so that the guide sleeve 22 and the drive sleeve 331 are threadedly engaged.

[0057] In this embodiment, the locking structure 332 is set as a thread between the guide sleeve 22 and the drive sleeve 331, so that the two are connected by a thread. Thus, when the two are rotated relative to each other, the drive sleeve 331 can move up and down relative to the guide sleeve 22, and unlocking and locking can be achieved. The structure is simple and the operation is convenient.

[0058] It should be noted that, to facilitate the rotation of the drive sleeve 331 relative to the guide sleeve 22, in one embodiment, a limiting slide rail 131 is provided on the inner wall of the guide sleeve 22 and the guide arm 13, and a limiting groove 22a is provided on the other. The limiting slide rail 131 is slidably disposed in the limiting groove 22a and extends axially along the guide sleeve 22, thereby preventing the guide sleeve 22 from rotating around its axis. Specifically, in this solution, the limiting groove 22a is disposed on the inner wall of the drive sleeve 331, and the limiting slide rail 131 is disposed on the guide arm 13.

[0059] In one embodiment, please refer to Figure 5 The side wall of the drive sleeve 331 is provided with a limiting screw hole 331a; the drive component 33 also includes a limiting bolt 334, which is threadedly connected to the drive sleeve 331 via the limiting screw hole 331a and can press against the guide sleeve 22.

[0060] In this embodiment, after the drive sleeve 331 moves to the preset position, the limiting bolt 334 is tightened so that the limiting bolt 334 presses against the guide sleeve 22 to restrict the drive sleeve 331 from rotating relative to the guide sleeve 22, thereby further improving the stability of the drive sleeve 331 when locked.

[0061] In one embodiment, please refer to Figure 6 The drive unit 33 also includes a connecting spring 335, which connects the transmission arm 311 and the mounting plate 23, and is used to drive the cutting blade 31 to move toward the guide sleeve 22.

[0062] In this embodiment, the transmission arm 311 and the mounting plate 23 are connected by the connecting spring 335. So, after the drive sleeve 331 is moved down to move the transmission arm 311 outward to the drill bit 1 to expand the inner diameter of the membrane orifice, when it is necessary to reduce the inner diameter of the membrane orifice, it is only necessary to move the drive sleeve 331 up. At this time, the transmission arm 311 automatically retracts under the drive of the connecting spring 335 to reduce the inner diameter of the membrane orifice and improve convenience.

[0063] In one embodiment, the drive sleeve 331 includes a pressing section 336 and a drive section 337. The pressing section 336 and the drive section 337 are connected sequentially in a direction away from the drill end 11. The drive section 337 is cylindrical and has anti-slip stripes on its outer wall. An annular pressing surface 333 is formed in the pressing section 336.

[0064] In this embodiment, the operator can hold the drive section 337 to rotate the drive sleeve 331, improving the ease of rotation of the drive sleeve 331. It should be noted that in one embodiment, the drill bit 1 is a full-conical drill bit 1; in another embodiment, the drill bit 1 is a twist drill. And in yet another embodiment, the drill bit 1 is configured as a tapered section and a cylindrical section connected in sequence.

[0065] To better understand this utility model, the following is combined with... Figures 1 to 6 The technical solution of this utility model is described in detail below:

[0066] In this design, the compression spring 321 is positioned between the guide sleeve 22 and the stop part 6. Thus, when the drilling end 11 of the drill bit 1 breaks through the soil and extends into the ground to create a hole, the mounting plate 23 is stopped at the ground surface. As the drill bit 1 continues to move downwards, the drive sleeve 331 connected to the mounting plate 23 drives the guide sleeve 22 to compress the elastic element 32 until the drilling depth reaches the preset value. During this process, the compression spring 321 is compressed, causing it to exert a downward elastic force on the mounting plate 23. This increases the ability of the cutting blade 31 to break the plastic film, rather than relying solely on the weight of the mounting part 2 and the cutting blade 31 to break the film. This improves the device's ability to cut the plastic film, and based on the elastic extension and contraction characteristics of the compression spring 321, it is possible to create wells of different depths.

[0067] Meanwhile, since the cutting blade 31 is located at the mounting end 21, the cutting blade 31 is located on the outer side of the drill bit 1 in the horizontal direction. Therefore, when rotating to cut the film, the inner diameter of the film opening made by the cutting blade 31 is larger than the inner diameter of the well, thereby expanding the film and effectively avoiding the scalding of the tobacco leaves due to the small opening size of the film.

[0068] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A tobacco field perforating and expanding device, characterized in that, The application relates to a drilling and film-expanding device. The device comprises a drill bit, a mounting part and a film-expanding part. The drill bit has a drilling end and a connecting end, and the drilling end is used for breaking soil. The mounting part is movably mounted on the connecting end, and the moving direction of the mounting part is consistent with the arrangement direction of the connecting end and the drilling end.

2. The tobacco field perforating and expanding device of claim 1, wherein, The film-expanding part comprises a cutting knife and an elastic member. The cutting knife is mounted on the mounting part and located on the side of the mounting part close to the drill bit end.

3. The tobacco field perforating and expanding device of claim 2, wherein, The distance between the cutting knife and the axis of the drilling end is greater than the outer diameter of the drilling end. The elastic member connects the mounting part and the connecting end.

4. The tobacco field perforating and expanding device of claim 2, wherein, The connecting end extends in the direction away from the drilling end and has a guide arm. The mounting part has a guide channel, and the mounting part can be slidably sleeved on the guide arm through the guide channel.

5. The tobacco field perforating and expanding device of claim 4, wherein, The device further comprises a driving arm, a handle and a stop part. The driving arm is detachably connected to the guide arm and extends in the direction away from the guide arm.

6. The tobacco field perforating and expanding device of claim 5, wherein, The handle is connected to the end of the driving arm away from the guide arm. The stop part is mounted on the end of the driving arm close to the guide arm.

7. The tobacco field perforating and expanding device of claim 6, wherein, The elastic member comprises a compression spring.

8. The tobacco field perforating and expanding device of claim 7, wherein, The compression spring is sleeved outside the guide arm and located between the mounting part and the stop part. The mounting part comprises a guide sleeve and a mounting disc. The guide sleeve is sleeved outside the guide arm and connected to the connecting end through the elastic member. The internal passage of the guide sleeve constitutes the guide channel. The mounting disc is annularly arranged outside the guide sleeve. The end of the mounting disc away from the guide sleeve is provided for mounting the cutting knife. The cutting knife is provided with a plurality of cutting knives. The plurality of cutting knives are arranged in the circumferential direction of the mounting disc. Each cutting knife can move in the direction close to or away from the guide sleeve relative to the mounting disc. The film-expanding part further comprises a driving member. The driving member is mounted on the guide sleeve or the mounting disc and connected to the plurality of cutting knives. The driving member drives each cutting knife to move in the direction close to or away from the guide sleeve. The driving member can maintain the cutting knife at any position on the moving stroke. The mounting disc is provided with a plurality of sliding grooves. Each sliding groove penetrates the mounting disc in the direction close to the drill bit end. The plurality of sliding grooves correspond to the plurality of cutting knives. Each cutting knife has a transmission arm penetrating the corresponding sliding groove. The driving member comprises a driving sleeve and a locking structure. The driving sleeve is sleeved outside the guide sleeve and can move in the axial direction of the guide sleeve. The outer wall of the driving sleeve is gradually expanded in the direction away from the drilling end and forms an annular pressing surface. The annular pressing surface is slidably pressed on the transmission arm. The locking structure is arranged between the driving sleeve and the guide sleeve. The locking structure locks the driving sleeve on the guide sleeve and can unlock the driving sleeve. The locking structure is respectively a thread arranged on the outer wall of the guide sleeve and the inner wall of the driving sleeve. The guide sleeve and the driving sleeve are threadedly connected. The side wall of the driving sleeve is provided with a limiting screw hole. The driving member further comprises a limiting bolt. The limiting bolt is threadedly connected with the driving sleeve through the limiting screw hole and can be pressed on the guide sleeve.

9. The tobacco field perforating and expanding device of claim 6, wherein, The driving member further comprises a connecting spring connecting the transmission arm and the mounting disc, for driving the cutting knife to move towards the guide sleeve.

10. The tobacco field perforating and expanding device of claim 6, wherein, The driving sleeve comprises a pressing section and a driving section, the pressing section and the driving section are connected in sequence in a direction away from the drilling end, the driving section is cylindrically arranged, and an anti-skid stripe is arranged on the outer wall of the driving section. The annular pressing surface is formed on the pressing section.

Images