Cutter mechanism

Abstract

The utility model discloses a cutter mechanism which comprises a fixing base, a lifting air cylinder is arranged on the fixing base, and the two ends of a piston rod of the lifting air cylinder extend out of the lifting air cylinder. A rotating shaft is arranged in a piston rod of the lifting air cylinder, the two ends of the rotating shaft extend out of the piston rod in the axial direction of the piston rod, and the rotating shaft is driven by the piston rod to stretch out and draw back along with the piston rod. A driving motor is arranged on the fixed seat and is in transmission connection with the top end of the rotating shaft to drive the rotating shaft to rotate relative to the piston rod of the lifting air cylinder in the circumferential direction of the piston rod; the bottom end of the rotating shaft is connected with a cutter assembly, and the cutter assembly synchronously stretches out and draws back and synchronously rotates along with the rotating shaft. According to the utility model, the structural complexity of the notching mechanism can be reduced, and the structural stability during use is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medicine manufacturing, in particular to a cutter mechanism. Background Art

[0002] A syringe bottle, also known as a borosilicate glass or soda-lime glass tube (molded) injection bottle, is a small bottle widely used in the medical field that is sealed with a rubber stopper and an aluminum-plastic combination cover.

[0003] After a vial is filled with medication, the cap of the vial needs to be pressed and cut to seal the cap with the bottle body. Existing vial capping methods use a motor to drive a belt cam structure to rotate the cutting assembly, squeezing the cap while simultaneously cutting and sealing the bottom of the cap. While this can achieve the desired installation and sealing of the cap, the motor-driven belt cam structure still has complex rotational mechanisms for the cutting assembly, increasing the difficulty of repair and maintenance. Furthermore, during the relative displacement between the cutting assembly and the cap, squeezing the cap to seal, the belt cam structure can vibrate or even shift under the force of the squeeze, resulting in poor structural stability and impacting capping efficiency. Summary of the Invention

[0004] The utility model aims to provide a cutter mechanism, which can reduce structural complexity and improve structural stability.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a cutting mechanism, and the specific implementation scheme is as follows:

[0006] A cutter mechanism comprises a fixed base, a lifting cylinder is provided on the fixed base, and both ends of the piston rod of the lifting cylinder extend outside the lifting cylinder;

[0007] A rotating shaft is provided in the piston rod of the lifting cylinder, and both ends of the rotating shaft extend outside the piston rod along the axial direction of the piston rod and extend and retract along with the piston rod under the drive of the piston rod;

[0008] A drive motor is provided on the fixing seat, and the drive motor is in transmission connection with the top end of the rotating shaft, driving the rotating shaft to rotate relative to the piston rod of the lifting cylinder along the circumferential direction of the piston rod;

[0009] A cutter assembly is connected to the bottom end of the rotating shaft, and the cutter assembly is synchronously extended and rotated with the rotating shaft.

[0010] The utility model provides a cutter mechanism, compared with the prior art, by arranging a lifting cylinder and a driving motor on a fixed seat, a piston rod of the lifting cylinder is arranged so that both ends extend outside the lifting cylinder, and a rotating shaft is arranged inside the piston rod, and both ends of the rotating shaft extend outside the piston rod. On the one hand, the top end of the rotating shaft is connected to the driving motor and rotates relative to the piston rod under the drive of the driving motor, and the bottom end of the rotating shaft is connected to the cutter assembly, so that the cutter assembly rotates synchronously with the rotating shaft; on the other hand, the rotating shaft can follow the piston rod to extend and retract under the telescopic action of the piston rod, synchronously driving the cutter assembly to extend and retract, so that the cutter assembly approaches or moves away from the syringe bottle, thereby achieving the purpose of the cutter assembly squeezing the bottle cap of the syringe bottle and rotating and sealing it; the lifting cylinder is driven to extend and retract while the driving motor is driven to rotate the rotating shaft, so that the structure is simpler and more stable, the structural complexity is reduced, the convenience of repair and maintenance is improved, and the structural stability is improved, thereby increasing the service life and reducing the use cost.

[0011] In some embodiments, a motor seat is provided on the fixed seat, the driving motor is provided on the motor seat, a driving gear is provided on the motor shaft of the driving motor, a driven gear is provided on the top end of the rotating shaft, and the driven gear is meshed with the driving gear.

[0012] By connecting the motor base and the fixed base, the installation stability of the drive motor on the fixed base is improved, and the transmission connection between the rotating shaft and the drive motor is realized by adopting a structure in which the master-slave gear and the driven gear are meshed and connected, which reduces the structural complexity and improves the stability of the transmission.

[0013] In some embodiments, the thickness of the driven gear is greater than the thickness of the driving gear, and the difference in thickness between the driven gear and the driving gear is greater than or equal to the telescopic stroke of the lifting cylinder.

[0014] By setting the thickness of the driven gear to be greater than that of the driving gear and the thickness difference between the two being greater than or equal to the telescopic stroke of the lifting cylinder, it is ensured that the driven gear can always be engaged with the driving gear during the process of the lifting cylinder driving the rotating shaft to rise and fall, thereby avoiding transmission failure of the drive motor and the rotating shaft and further improving transmission stability.

[0015] In some embodiments, a positioning groove is provided on the inner wall of the driven gear, and a positioning protrusion is provided on the outer wall of the rotating shaft; or a positioning protrusion is provided on the inner wall of the driven gear, and a positioning groove is provided on the outer wall of the rotating shaft, and the positioning protrusion and the positioning groove are plugged into each other.

[0016] The positioning between the driven gear and the rotating shaft is achieved by adopting a structure in which the positioning protrusion and the positioning groove are plugged in and matched, ensuring that the driven gear can drive the rotating shaft to rotate synchronously when it is driven by the driving gear.

[0017] In some embodiments, a through hole is provided in the piston rod, and two connecting sleeves are fixedly connected to the outer wall of the rotating shaft. The connecting sleeves are inserted into the through hole from both ends of the piston rod and rotate along the circumferential direction of the piston rod in the through hole following the rotating shaft. A limiting step is provided on the connecting sleeve, and the limiting step cooperates with the two ends of the piston rod to limit the position.

[0018] By arranging a through hole in the piston rod and arranging a connecting sleeve on the outer wall of the rotating shaft, and utilizing the limiting step on the connecting sleeve, it is ensured that when the rotating shaft is inserted into the through hole, the connecting sleeve rotates relative to the piston rod in the through hole along the circumferential direction of the piston rod. At the same time, the limiting step drives the rotating shaft to move in the axial direction of the piston rod following the extension and retraction of the piston rod, thereby pushing the cutter assembly towards or away from the bottle cap of the syringe bottle.

[0019] In some embodiments, connecting gaskets are provided between the connecting sleeve and the driven gear and between the connecting sleeve and the cutter assembly. The connecting gaskets located between the connecting sleeve and the driven gear abut against the driving gear and the limiting step, respectively. The connecting gaskets located between the connecting sleeve and the cutter assembly abut against the limiting step and the cutter assembly, respectively.

[0020] By arranging connecting gaskets between the connecting sleeve and the driven gear, as well as between the connecting sleeve and the cutter assembly, friction between the connecting sleeve and the driven gear, as well as friction between the connecting sleeve and the cutter assembly, can be prevented during the rotation of the rotating shaft, thereby preventing damage to the connecting sleeve, the driven gear and the cutter assembly.

[0021] In some embodiments, the cutter assembly includes a cutter seat, a cutter rod, a cutter blade, and an extrusion member, wherein the top of the cutter seat is connected to the rotating shaft and rotates and retracts under the drive of the rotating shaft;

[0022] A cavity is formed in the cutter seat, and a plurality of cutter rods are hinged on the outer peripheral wall of the cutter seat. The plurality of cutter rods swing in a direction between the axial direction and the radial direction of the cutter seat, and the top ends of the cutter rods are located in the cavity, and the bottom ends of the cutter rods are located below the cutter seat and connected to the cutter blade;

[0023] The extrusion piece is provided at the bottom of the cutter seat. The extrusion piece moves in the axial direction of the cutter seat into the cavity to push the top ends of the cutter rods away from each other, and the bottom ends of the cutter rods drive the cutting blades to move closer to each other, or when the top ends of the cutter rods are separated from the cavity, the top ends of the cutter rods lose the driving force and move closer to each other, and the bottom ends of the cutter rods drive the cutting blades to move away from each other.

[0024] The cutter assembly is arranged to squeeze the cap of the vial with an extruder and simultaneously retract into the cavity to push the top ends of the cutter rods away from each other, causing the cutter rods hinged on the cutter seat to swing, and the cutting blades connected to the bottom of the cutter rods move closer to each other to perform a rotary incision and seal the cap of the vial.

[0025] In some embodiments, a buffer spring is provided between the top end of the cutter seat and the piston rod. The buffer spring is sleeved on the rotating shaft. One end of the buffer spring abuts against the piston rod, and the other end abuts against the cutter seat.

[0026] By arranging a buffer spring between the top of the cutter seat and the piston rod, when the extrusion piece of the cutter seat squeezes the bottle cap of the syringe bottle to generate a relative force, the buffer spring is used for buffering, thereby improving the service life of the cutter assembly and the rotating shaft.

[0027] In some embodiments, a lifting seat is provided on the fixed seat, a fixing rod is passed through the lifting seat, a lifting screw is provided in the fixing rod, the lifting screw is connected to the top end of the fixing rod and rotates relative to the fixing rod along the circumferential direction of the fixing rod, a lifting block is screwed on the lifting screw, the lifting block is connected to the lifting seat, and the lifting block moves in the axial direction of the lifting screw under the rotation of the lifting screw, driving the lifting seat and the fixed seat to move on the fixed rod along the axial direction of the lifting screw.

[0028] By adopting a lifting block connection method in which a lifting seat and a lifting screw in a fixed rod are screwed together, the lifting seat drives the fixed seat and the cutter assembly to move along the axial direction of the lifting screw on the fixed rod, and the height of the cutter assembly is adjusted to adapt to the extrusion sealing of bottle caps of vials of different heights, thereby improving the scope of use.

[0029] In some embodiments, a lifting slot is provided on the outer wall of the fixing rod, and a connecting block is provided on the lifting block or the lifting seat. The connecting block passes through the lifting slot and is connected to the lifting seat or the lifting block.

[0030] By opening a lifting groove on the outer wall of the fixing rod, the lifting seat and the lifting block can be connected through the connecting block by using the lifting groove, and the lifting limit is realized by using the connecting block and the two ends of the lifting groove.

[0031] Based on the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0032] By arranging a lifting cylinder and a driving motor on a fixed seat, the piston rod of the lifting cylinder is arranged to have both ends extending outside the lifting cylinder, and a rotating shaft is arranged in the piston rod, and both ends of the rotating shaft extend outside the piston rod. On the one hand, the top end of the rotating shaft is connected to the driving motor and rotates relative to the piston rod under the drive of the driving motor, and the bottom end of the rotating shaft is connected to the cutter assembly, so that the cutter assembly rotates synchronously with the rotating shaft; on the other hand, the rotating shaft can follow the piston rod to extend and retract under the telescopic action of the piston rod, and synchronously drive the cutter assembly to extend and retract, so that the cutter assembly approaches or moves away from the syringe bottle, thereby achieving the purpose of the cutter assembly squeezing the bottle cap of the syringe bottle and rotating and sealing it; the lifting cylinder is driven to extend and retract while the rotating shaft is connected to the driving motor, so that the structure is simpler and more stable, the structural complexity is reduced, the convenience of repair and maintenance is improved, and the structural stability is improved, thereby increasing the service life and reducing the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural diagram of the utility model;

[0034] Figure 2 This is an exploded view of the utility model;

[0035] Figure 3 It is a cross-sectional view of the utility model.

[0036] Description of reference numerals:

[0037] 100, fixed seat; 110, splint; 200, lifting cylinder; 210, piston rod; 220, rotating shaft; 230, driven gear; 240, connecting sleeve; 250, connecting gasket; 260, buffer spring; 300, driving motor; 310, motor seat; 320, driving gear; 400, cutter assembly; 410, cutter seat; 411, cavity; 420, cutter rod; 421, pushing wheel; 430, cutting blade; 440, extrusion piece; 500, lifting seat; 600, fixed rod; 610, lifting screw; 620, lifting block; 630, lifting slot; 640, top cover; 700, protective cover. DETAILED DESCRIPTION

[0038] In order to facilitate the understanding of the present invention, specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0039] Unless otherwise specified or defined, the "first, second..." used in this article is only used to distinguish names and does not represent a specific quantity or order.

[0040] Unless stated otherwise or defined otherwise, the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] It should be noted that, in this document, “fixed to” or “connected to” may mean directly fixing or connecting to an element, or indirectly fixing or connecting to an element.

[0042] like Figure 1-3 As shown, a cutting mechanism provided in this embodiment includes a fixed base 100, which is composed of two oppositely arranged clamping plates 110. A lifting cylinder 200 is clamped and fixed between the two clamping plates 110, and both ends of the piston rod 210 of the lifting cylinder 200 extend outside the lifting cylinder 200 and pass through the clamping plate 110 on the same side as it.

[0043] A through hole is provided in the piston rod 210 of the lifting cylinder 200 , and a rotating shaft 220 is provided in the through hole. Both ends of the rotating shaft 220 extend to the outside of the piston rod 210 .

[0044] A motor seat 310 is provided on the splint 110 at the top of the fixing seat 100, and a gap is provided between the motor seat 310 and the splint 110. A driving motor 300 is provided on the top of the motor seat 310, and the motor shaft of the driving motor 300 passes through the motor seat 310 and extends into the gap between the motor seat 310 and the splint 110 and is connected to a driving gear 320. A driven gear 230 is connected to the top end of the rotating shaft 220, and the driven gear 230 is meshed with the driving gear 320, so that the rotating shaft 220 and the driving motor 300 are transmission-connected, and driven by the driving motor 300, the piston rod 210 generates relative rotation along the circumferential direction of the piston rod 210.

[0045] A positioning protrusion is provided on the outer wall of the rotating shaft 220, and a positioning groove is provided on the inner wall of the driven gear 230; or a positioning groove is provided on the outer wall of the rotating shaft 220, and a positioning protrusion is provided on the inner wall of the driven gear 230. The positioning protrusion and the positioning groove are plugged into each other to ensure that the rotating shaft 220 is inevitably driven to rotate when the driven gear 230 rotates.

[0046] In addition, the thickness of the driven gear 230 is greater than the thickness of the driving gear 320, and the thickness difference between the driven gear 230 and the driving gear 320 is greater than or equal to the telescopic stroke of the lifting cylinder 200, ensuring that the driven gear 230 can always be engaged with the driving gear 320 during the process of the lifting cylinder 200 driving the rotating shaft 220 to rise and fall, avoiding transmission failure between the drive motor 300 and the rotating shaft 220, and further improving transmission stability.

[0047] A cutter assembly 400 is connected to the bottom of the rotating shaft 220 , and the cutter assembly 400 is used to squeeze the cap of the vial and simultaneously rotate to seal the bottom of the cap.

[0048] The piston rod 210 expands and contracts in its own axial direction during the operation of the lifting cylinder 200, driving the rotating shaft 220 to expand and contract synchronously.

[0049] Specifically, two oppositely arranged connecting sleeves 240 are provided on the rotating shaft 220. The connecting sleeves 240 are fixedly connected to the rotating shaft 220 and are inserted into the through hole from the top and bottom ends of the piston rod 210 respectively. A limiting step is provided on the connecting sleeve 240, and the limiting step abuts against the top or bottom end of the piston rod 210. When the piston rod 210 descends, the limiting step at the bottom drives the rotating shaft 220 to descend. When the piston rod 210 rises, the limiting step at the top drives the rotating shaft 220 to rise.

[0050] A connecting gasket 250 is provided between the connecting sleeve 240 and the driven gear 230 and between the connecting sleeve 240 and the cutter assembly 400. The connecting gasket 250 located between the connecting sleeve 240 and the driven gear 230 abuts against the driving gear 320 and the limiting step respectively, and the connecting gasket 250 located between the connecting sleeve 240 and the cutter assembly 400 abuts against the limiting step and the cutter assembly 400 respectively, to prevent friction between the connecting sleeve 240 and the driven gear 230 and between the connecting sleeve 240 and the cutter assembly 400 during the rotation of the rotating shaft 220, thereby preventing damage to the connecting sleeve 240, the driven gear 230 and the cutter assembly 400.

[0051] The cutter assembly 400 includes a cutter seat 410 , a cutter rod 420 , a cutter blade 430 and an extrusion member 440 . The top of the cutter seat 410 is connected to the rotating shaft 220 and rotates and retracts under the drive of the rotating shaft 220 .

[0052] A cavity 411 is formed in the cutter seat 410, and a plurality of cutter rods 420 are hinged on the outer peripheral wall of the cutter seat 410. The plurality of cutter rods 420 swing in a direction between the axial direction and the radial direction of the cutter seat 410, and the top end of the cutter rod 420 is located in the cavity 411, and the bottom end of the cutter rod 420 is located below the cutter seat 410 and is connected to the cutting blade 430.

[0053] The extrusion piece 440 is provided at the bottom of the cutter seat 410. The extrusion piece 440 moves in the axial direction of the cutter seat 410 into the cavity 411 to push the top ends of the cutter rods 420 away from each other, and the bottom ends of the cutter rods 420 drive the cutting blades 430 to move toward each other, or when the top ends of the cutter rods 420 are separated from the cavity 411, the top ends of the cutter rods 420 lose the driving force and move toward each other, and the bottom ends of the cutter rods drive the cutting blades 430 to move away from each other.

[0054] In actual use, the cutter seat 410 approaches the syringe bottle under the push of the rotating shaft 220 until the extrusion piece 440 at the bottom of the cutter seat 410 squeezes the bottle cap of the syringe bottle and shrinks into the cavity 411, pushing the top ends of the cutter rod 420 away from each other, so that the cutter rod 420 hinged on the cutter seat 410 swings, and the cutting blades 430 connected to the bottom of the cutter rod 420 move closer to each other to perform a rotary incision and seal the bottle cap of the syringe bottle.

[0055] A pushing wheel 421 is provided on the portion of the cutter rod 420 located in the cavity 411. In an initial state, the positive projection of the pushing wheel 421 on the bottom of the cavity 411 at least partially covers the extrusion member 440, so that the extrusion member 440 pushes the pushing wheel 421 when entering the cavity 411. When the pushing wheel 421 rotates, it drives the cutter rod 420 to swing angle, thereby avoiding direct collision and damage to the cutter rod 420.

[0056] A buffer spring 260 is provided between the top end of the cutter seat 410 and the piston rod 210. The buffer spring 260 is sleeved on the rotating shaft 220. One end of the buffer spring 260 abuts against the piston rod 210, and the other end abuts against the cutter seat 410. When the extrusion piece 440 of the cutter seat 410 squeezes the bottle cap of the syringe bottle to generate a relative force, the buffer spring 260 is used for buffering, thereby improving the service life of the cutter assembly 400 and the rotating shaft 220.

[0057] At the other end of the fixing seat 100, there is a lifting seat 500 clamped and fixed by two clamping plates 110. A fixing rod 600 is passed through the lifting seat 500. Both ends of the fixing rod 600 pass through the clamping plates 110 on the same side, which is used to fix the entire cutter mechanism on mechanical equipment such as a bottle unscrambler.

[0058] A top cover 640 is provided on the top of the fixed rod 600, and a lifting screw 610 provided inside the fixed rod 600 is connected to the top cover 640. A lifting block 620 is sleeved on the lifting screw 610. The lifting block 620 is screwed to the lifting screw 610 and connected to the lifting seat 500. When in use, the lifting screw 610 is manually rotated to make the lifting block 620 move in the axial direction of the lifting screw 610, thereby driving the lifting seat 500 and the fixed seat 100 to move on the fixed rod 600 and adjust the height of the fixed seat 100.

[0059] A lifting slot 630 is provided on the outer wall of the fixing rod 600, and a connecting block is provided on the lifting block 620 or the lifting seat 500. The connecting block passes through the lifting slot 630 and is connected to the lifting seat 500 or the lifting block 620. The opening of the lifting slot 630 ensures that the lifting seat 500 and the lifting block 620 can be connected through the connecting block, while the lifting and lowering are limited by the connecting block and the two ends of the lifting slot 630.

[0060] A protective cover 700 is provided on the fixing base 100 , and the protective cover 700 covers the lifting cylinder 200 , the driving motor 300 and the motor base 310 to provide dust protection.

[0061] The present embodiment provides a cutter mechanism, compared with the prior art, by arranging a lifting cylinder 200 and a driving motor 300 on a fixed seat 100, a piston rod 210 of the lifting cylinder 200 is arranged so that both ends extend outside the lifting cylinder 200, and a rotating shaft 220 is arranged inside the piston rod 210, and both ends of the rotating shaft 220 extend outside the piston rod 210. On the one hand, the top end of the rotating shaft 220 is connected to the driving motor 300, and rotates relative to the piston rod 210 under the drive of the driving motor 300. The bottom end of the rotating shaft 220 is connected to the cutter assembly 400, so that the cutter assembly 400 can be moved with the cutting blade 400. It rotates synchronously with the rotating shaft 220; on the other hand, the rotating shaft 220 can follow the piston rod 210 to extend and retract under the extension and retraction action of the piston rod 210, and synchronously drive the cutter assembly 400 to extend and retract, so that the cutter assembly 400 can approach or move away from the vial, thereby achieving the purpose of the cutter assembly 400 squeezing the bottle cap of the vial and rotating to seal it; the driving motor 300 is used to drive the rotating shaft 220 to rotate, and the lifting cylinder 200 drives the extension and retraction at the same time, so the structure is simpler and more stable, the structural complexity is reduced, the convenience of repair and maintenance is improved, and the structural stability is improved, thereby increasing the service life and reducing the cost of use.

[0062] Based on the disclosure and teachings of the above description, those skilled in the art may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and any modifications and variations of the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although certain specific terms are used in this description, these terms are for convenience of description only and do not constitute any limitation to the present invention.

Claims

1. A cutting mechanism, characterized in that: It comprises a fixed seat (100), a lifting cylinder (200) is provided on the fixed seat (100), and both ends of a piston rod (210) of the lifting cylinder (200) extend outside the lifting cylinder (200); A rotating shaft (220) is provided in the piston rod (210) of the lifting cylinder (200), and both ends of the rotating shaft (220) extend outside the piston rod (210) along the axial direction of the piston rod (210), and extend and retract along with the piston rod (210) under the drive of the piston rod (210); A driving motor (300) is provided on the fixing seat (100), and the driving motor (300) is in transmission connection with the top end of the rotating shaft (220), driving the rotating shaft (220) to rotate relative to the piston rod (210) of the lifting cylinder (200) along the circumferential direction of the piston rod (210); A cutter assembly (400) is connected to the bottom end of the rotating shaft (220), and the cutter assembly (400) is synchronously extended and rotated following the rotating shaft (220).

2. The cutter mechanism according to claim 1, wherein: A motor base (310) is provided on the fixing base (100), the driving motor (300) is provided on the motor base (310), a driving gear (320) is sleeved on the motor shaft of the driving motor (300), a driven gear (230) is sleeved on the top end of the rotating shaft (220), and the driven gear (230) is meshedly connected with the driving gear (320).

3. The cutter mechanism according to claim 2, wherein: The thickness of the driven gear (230) is greater than the thickness of the driving gear (320), and the difference in thickness between the driven gear (230) and the driving gear (320) is greater than or equal to the telescopic stroke of the lifting cylinder (200).

4. The cutter mechanism according to claim 2, wherein: A positioning groove is provided on the inner wall of the driven gear (230), and a positioning convex block is provided on the outer wall of the rotating shaft (220); or a positioning convex block is provided on the inner wall of the driven gear (230), and a positioning groove is provided on the outer wall of the rotating shaft (220), and the positioning convex block and the positioning groove are plug-fitted.

5. The cutting mechanism according to any one of claims 2 to 4, characterized in that: A through hole is provided in the piston rod (210), and two connecting sleeves (240) are fixedly connected to the outer wall of the rotating shaft (220). The connecting sleeves (240) are inserted into the through hole from both ends of the piston rod (210) and rotate along the circumferential direction of the piston rod (210) in the through hole following the rotating shaft (220). A limiting step is provided on the connecting sleeve (240), and the limiting step is matched with the two ends of the piston rod (210).

6. The cutter mechanism according to claim 5, wherein: A connecting gasket (250) is provided between the connecting sleeve (240) and the driven gear (230), and between the connecting sleeve (240) and the cutter assembly (400). The connecting gasket (250) located between the connecting sleeve (240) and the driven gear (230) abuts against the driving gear (320) and the limiting step, respectively. The connecting gasket (250) located between the connecting sleeve (240) and the cutter assembly (400) abuts against the limiting step and the cutter assembly (400) respectively.

7. The cutter mechanism according to any one of claims 1 to 4, characterized in that: The cutter assembly (400) comprises a cutter seat (410), a cutter rod (420), a cutter blade (430) and an extrusion member (440); the top of the cutter seat (410) is connected to the rotating shaft (220) and rotates and retracts under the drive of the rotating shaft (220); A cavity (411) is formed in the cutter seat (410), and a plurality of cutter rods (420) are hinged on the outer peripheral wall of the cutter seat (410). The plurality of cutter rods (420) swing in a direction between the axial direction and the radial direction of the cutter seat (410), and the top end of the cutter rod (420) is located in the cavity (411), and the bottom end of the cutter rod (420) is located below the cutter seat (410) and is connected to the cutter blade (430); The extrusion member (440) is provided at the bottom of the cutter seat (410). The extrusion member (440) moves in the axial direction of the cutter seat (410) into the cavity (411) to push the top ends of the cutter rods (420) away from each other, and the bottom ends of the cutter rods (420) drive the cutting blades (430) to move toward each other, or when the top ends of the cutter rods (420) are separated from the cavity (411), the top ends of the cutter rods (420) lose the driving force and move toward each other, and the bottom ends of the cutter rods drive the cutting blades (430) to move away from each other.

8. The cutter mechanism according to claim 7, wherein: A buffer spring (260) is provided between the top end of the cutter seat (410) and the piston rod (210). The buffer spring (260) is sleeved on the rotating shaft (220). One end of the buffer spring (260) abuts against the piston rod (210), and the other end abuts against the cutter seat (410).

9. The cutter mechanism according to any one of claims 1 to 4, characterized in that: A lifting seat (500) is provided on the fixed seat (100), a fixed rod (600) is passed through the lifting seat (500), a lifting screw (610) is provided in the fixed rod (600), the lifting screw (610) is connected to the top end of the fixed rod (600), and rotates relative to the fixed rod (600) along the circumferential direction of the fixed rod (600), a lifting block (620) is screwed on the lifting screw (610), the lifting block (620) is connected to the lifting seat (500), and the lifting block (620) moves in the axial direction of the lifting screw (610) under the rotation of the lifting screw (610), driving the lifting seat (500) and the fixed seat (100) to move along the axial direction of the lifting screw (610) on the fixed rod (600).

10. The cutter mechanism according to claim 9, wherein: A lifting groove (630) is provided on the outer wall of the fixing rod (600), and a connecting block is provided on the lifting block (620) or the lifting seat (500). The connecting block passes through the lifting groove (630) and is connected to the lifting seat (500) or the lifting block (620).

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