A variable diameter paper cutting device for paper bag production

Abstract

The application discloses a variable-diameter paper cutting device for paper bag production, which comprises a machine base, a cutting roller, a cutting mechanism and a variable-diameter mechanism. The cutting mechanism comprises a cutter assembly arranged on the outer periphery of the cutting roller, and a telescopic assembly is connected between the cutter assembly and the cutting roller. The variable-diameter mechanism comprises an intermediate shaft, an adjusting nut, a first locking assembly and a second locking assembly. The intermediate shaft is arranged in the cutting roller in an axial sliding mode, and the intermediate shaft is provided with a driving thread segment. The adjusting nut is rotatably arranged on the machine base, and the adjusting nut is threadedly sleeved with the driving thread segment. The intermediate shaft is in transmission connection with the telescopic assembly. The intermediate shaft is used for driving the telescopic assembly to extend and retract, so as to drive the cutter assembly to move in the radial direction of the cutting roller. The first locking assembly is used for locking and releasing the rotation between the adjusting nut and the machine base. The second locking assembly is used for locking and releasing the rotation between the adjusting nut and the intermediate shaft. Only one set of power assembly is needed to drive the cutting roller to rotate, so that the variable-diameter adjustment and the normal paper cutting operation can be realized.

Description

Technical Field

[0001] This invention relates to the field of paper bag production equipment technology, and in particular to a variable diameter paper cutting device for paper bag production. Background Technology

[0002] In the paper bag production process, the formed paper rolls need to be cut to form paper bags. Currently, cutting rollers with cutters are generally used to cut the paper rolls. However, the cutting position needs to be adjusted according to the size of the paper bag. Currently, the rotation diameter of the cutter is adjusted to adapt to the production of paper bags of different lengths. This is usually achieved by using two sets of servo power components to realize the rotation of the cutting roller and the adjustment of the cutter rotation diameter. This increases the cost and makes the internal overall transmission structure complex and weak, making it difficult to adapt to the needs of high-speed bag making. Summary of the Invention

[0003] The purpose of this invention is to provide a variable diameter paper cutting device for paper bag production, so as to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0005] This invention provides a variable diameter paper cutting device for paper bag production, comprising:

[0006] Base;

[0007] A cutting roller is rotatably mounted on the machine base;

[0008] A cutting mechanism includes at least one cutting blade assembly disposed on the outer periphery of the cutting roller, and a telescopic component that extends and retracts radially along the cutting roller is connected between the cutting blade assembly and the cutting roller.

[0009] The diameter-changing mechanism includes an intermediate shaft, an adjusting nut, a first locking component, and a second locking component. The intermediate shaft is axially slidably disposed within the cutting roller and has a drive threaded section. The adjusting nut is rotatably mounted on the machine base and threadedly engaged with the drive threaded section. The intermediate shaft is drively connected to the telescopic component. The intermediate shaft is used to drive the telescopic component to extend and retract by axial movement within the cutting roller, thereby driving the cutter assembly to move radially along the cutting roller. The first locking component is used to lock and release the rotation between the adjusting nut and the machine base, and the second locking component is used to lock and release the rotation between the adjusting nut and the intermediate shaft.

[0010] The beneficial effects of this invention are:

[0011] When the radial position of the cutter assembly needs to be adjusted, i.e., a diameter change operation is performed, the second locking component releases the rotation between the adjusting nut and the intermediate shaft, while the first locking component locks the rotation between the adjusting nut and the machine base. Then, the cutting roller is rotated, causing the intermediate shaft to rotate relative to the machine base. At this time, the intermediate shaft rotates relative to the adjusting nut. With the threaded engagement between the drive thread section and the adjusting nut, the intermediate shaft moves axially relative to the cutting roller, causing the telescopic component to extend and retract, thereby driving the cutter assembly to move radially along the cutting roller to achieve the diameter change. During normal paper cutting, the second locking component locks the rotation between the adjusting nut and the intermediate shaft. The first locking component releases the rotation between the adjusting nut and the machine base. When the cutting roller rotates, the adjusting nut and the intermediate shaft rotate together with the cutting roller, while the intermediate shaft remains fixed in the axial direction to achieve normal paper cutting operation. This technology allows for diameter adjustment by simply driving the cutting roller. Only one set of power components is needed to drive the cutting roller to achieve diameter adjustment and normal paper cutting operation, eliminating the need for a separate power component for diameter adjustment, thus reducing manufacturing costs. Furthermore, during normal paper cutting, the second locking component locks the rotation between the adjusting nut and the intermediate shaft, preventing displacement of the cutting blade assembly and improving the overall structural strength.

[0012] As a further improvement to the above technical solution, the first locking component includes at least one first locking part installed on the base and at least one second locking part located on the outer periphery of the adjusting nut, wherein the first locking part and the second locking part are matched and engaged.

[0013] When it is necessary to lock the rotation between the adjusting nut and the machine base, the adjusting nut is rotated to the position where the second locking part is opposite to the first locking part, and then the first locking part and the second locking part are matched and engaged to lock the adjusting nut.

[0014] As a further improvement to the above technical solution, the first locking part includes a pin and a first locking drive member that drives the pin to move radially along the adjusting nut, and the second locking part includes a pin hole provided on the outer peripheral wall of the adjusting nut.

[0015] This solution uses a first locking drive component to drive a pin into a pin hole, thereby locking the rotation of the adjusting nut.

[0016] As a further improvement to the above technical solution, the second locking component includes a locking sleeve and a second locking drive. The locking sleeve is rotatably disposed relative to the base. The locking sleeve is axially slidably fitted onto the intermediate shaft. The locking sleeve and the intermediate shaft are circumferentially fixed. The end of the locking sleeve is provided with a first snap-fit ​​portion. The adjusting nut is provided with a second snap-fit ​​portion facing the end face of the locking sleeve. The second locking drive is used to drive the locking sleeve to move closer to and away from the adjusting nut, so that the first snap-fit ​​portion and the second snap-fit ​​portion match, engage, and disengage.

[0017] When it is necessary to lock the rotation between the intermediate shaft and the adjusting nut, the second locking drive moves the locking sleeve closer to the adjusting nut, so that the first locking part and the second locking part engage, thereby achieving axial relative locking between the locking sleeve and the adjusting nut. Since the locking sleeve and the intermediate shaft are circumferentially fixed, the rotation between the intermediate shaft and the adjusting nut can be locked. When it is necessary to release the rotation between the intermediate shaft and the adjusting nut, the second locking drive moves the locking sleeve away from the adjusting nut, so that the first locking part and the second locking part separate.

[0018] As a further improvement to the above technical solution, the second locking assembly further includes a fixed sleeve fixedly connected to the base and a sliding sleeve slidably fitted inside the fixed sleeve. The locking sleeve is rotatably installed inside the sliding sleeve. The second locking drive is fixedly installed at the end of the fixed sleeve and is drively connected to the end of the sliding sleeve.

[0019] The second locking drive component of this solution moves axially within the fixed sleeve by driving the sliding sleeve to move the locking sleeve closer to and away from the adjusting nut. The locking sleeve is rotatably installed within the sliding sleeve, so that the locking sleeve can rotate with the intermediate shaft in any state without interfering with the movement of the intermediate shaft.

[0020] As a further improvement to the above technical solution, both the first and second locking parts are spline sleeve structures. The first and second locking parts are engaged by paired splines to achieve circumferential locking.

[0021] As a further improvement to the above technical solution, the outer periphery of the intermediate shaft is provided with a spline groove extending along the axial direction, and the inner periphery of the locking sleeve is provided with a spline block that slides in cooperation with the spline groove.

[0022] The locking sleeve in this design achieves axial limiting sliding and circumferential limiting locking through the spline block and the spline groove on the intermediate shaft.

[0023] As a further improvement to the above technical solution, the outer periphery of the cutting roller is fitted with a drive gear and a plurality of first rotating bearings. The cutting roller is mounted on the machine base through the first rotating bearings, and the drive gear is located between two adjacent first rotating bearings.

[0024] In use, the external power unit is connected to the drive gear transmission, which drives the cutting roller to rotate, so as to realize normal paper cutting and diameter adjustment. The drive gear is set between the two first rotating bearings to improve the stability of the connection between the external power unit and the cutting roller.

[0025] As a further improvement to the above technical solution, the telescopic assembly includes a plurality of telescopic frames connected between the cutter assembly and the cutting roller. The telescopic frame includes a first connecting rod and a second connecting rod. One end of the first connecting rod is hinged to the cutter assembly, and the other end is slidably mounted on the cutting roller along the axial direction and fixedly connected to the intermediate shaft. One end of the second connecting rod is hinged between the two ends of the first connecting rod, and the other end is hinged to the cutting roller.

[0026] During diameter adjustment, the intermediate shaft moves axially relative to the cutting roller. The intermediate shaft drives the other end of the first connecting rod to move axially along the cutting roller, thereby causing the first connecting rod and the second connecting rod to fold and extend, which in turn drives the cutter assembly to move radially along the cutting roller to achieve diameter adjustment.

[0027] As a further improvement to the above technical solution, the cutting assembly includes a blade holder arranged parallel to the cutting roller and at least one blade mounted on the outside of the blade holder. The blade can be replaced as needed during use. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0029] Figure 1 This is a schematic diagram of an embodiment of the variable diameter paper cutting device provided by the present invention;

[0030] Figure 2 yes Figure 1 A magnified view of part A in the middle;

[0031] Figure 3 This is a cross-sectional view of an embodiment of the variable diameter paper cutting device provided by the present invention;

[0032] Figure 4 yes Figure 3 A magnified view of part B in the middle section;

[0033] Figure 5 yes Figure 3 A magnified view of part C in the middle;

[0034] Figure 6 This is a schematic diagram of the left end structure of an embodiment of the intermediate shaft provided by the present invention. Detailed Implementation

[0035] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0036] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0037] In the description of this invention, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0038] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0039] Reference Figures 1-6 The variable diameter paper cutting device for paper bag production of the present invention is provided in the following embodiments:

[0040] like Figure 1 and 3 As shown, the variable diameter paper cutting device of the present invention includes a base 100, a cutting roller 200, a cutting mechanism 300, and a variable diameter mechanism 400.

[0041] In this embodiment, the cutting roller 200 is rotatably mounted on the machine base 100. Specifically, the cutting roller 200 extends to the left and right. In this embodiment, there are two machine bases 100, and the left and right ends of the cutting roller 200 are rotatably mounted on the two machine bases 100.

[0042] The cutting mechanism 300 includes at least one cutter assembly 310, which is disposed on the outer periphery between the two ends of the cutting roller 200. The number of cutter assemblies 310 can be two or more. In this embodiment, two cutter assemblies 310 are provided, which are arranged in a ring at intervals. The cutting roller 200 can perform two paper cutting operations for each rotation.

[0043] A telescopic component is provided between the cutter assembly 310 and the cutting roller 200. The telescopic component extends and retracts radially along the cutting roller 200 to drive the cutter assembly 310 to move radially along the cutting roller 200. Figure 1 and Figure 2 As shown, the telescopic assembly of this embodiment includes multiple telescopic frames 320, which are arranged at intervals along the axial direction of the cutting roller 200. Each telescopic frame 320 includes a first connecting rod 321 and a second connecting rod 322. One end of the first connecting rod 321 is hinged to the cutter assembly 310, and the other end is slidably mounted on the cutting roller 200 along the axial direction of the cutting roller 200. One end of the second connecting rod 322 is hinged between the two ends of the first connecting rod 321, and the other end is hinged to the cutting roller 200. When the end of the first connecting rod 321 connected to the cutting roller 200 is driven to move along the axial direction of the cutting roller 200, the first connecting rod 321 and the second connecting rod 322 can be folded and extended, thereby driving the cutter assembly 310 to move radially along the cutting roller 200 to achieve a change in diameter.

[0044] Regarding the configuration of the two cutting blade assemblies 310 in this embodiment, as follows: Figure 2 As shown, the telescopic frame 320 of this embodiment is provided with two pairs of first connecting rods 321 and second connecting rods 322. The two pairs of first connecting rods 321 and second connecting rods 322 are symmetrically arranged. The telescopic frame 320 is connected between a pair of cutter assemblies 310 on the opposite side and the cutting roller 200, thereby realizing the synchronous telescopic diameter change of the cutter assemblies 310 on both sides of the cutting roller 200.

[0045] Among them, such as Figure 2 and 4 As shown, the cutting roller 200 of this embodiment is provided with a guide groove 210 extending along the axial direction, and the first connecting rod 321 is connected to the guide seat 323 which slides with the guide groove 210.

[0046] In some other embodiments, the telescopic component may have other structures that allow the cutter assembly 310 to move radially along the cutting roller.

[0047] like Figure 1As shown, the cutter assembly 310 includes a blade holder 311 arranged parallel to the cutting roller 200 and at least one blade 312 mounted on the outside of the blade holder 311. During use, the blade 312 can be replaced as needed. The blade holder 311 is hinged to a plurality of first connecting rods 321.

[0048] like Figure 3 and Figure 5 As shown, the diameter-changing mechanism 400 includes an intermediate shaft 410, an adjusting nut 420, a first locking assembly 430, and a second locking assembly 440. The intermediate shaft 410 is axially slidably disposed within the cutting roller 200, coaxially disposed with the cutting roller 200, and is drively connected to the telescopic assembly. The intermediate shaft 410 is used to drive the telescopic assembly to extend and retract by moving axially within the cutting roller 200, thereby driving the cutter assembly 310 to move radially along the cutting roller 200. Specifically, as shown... Figure 4 As shown, in this embodiment, the intermediate shaft 410 is fixedly connected to multiple guide seats 323. The intermediate shaft 410 drives the multiple guide seats 323 to move along the guide groove 210, so as to drive the telescopic frame 320 to extend and retract.

[0049] like Figure 6 As shown, the intermediate shaft 410 is provided with a drive thread section 411, which is located at the left end of the intermediate shaft 410. The adjusting nut 420 is rotatably installed in the base 100 on the left side. In this embodiment, a second rotary bearing 450 is provided between the adjusting nut 420 and the base 100. The adjusting nut 420 is threadedly fitted onto the drive thread section 411. The first locking component 430 is used to lock and release the rotation between the adjusting nut 420 and the base 100, while the second locking component 440 is used to lock and release the rotation between the adjusting nut 420 and the intermediate shaft 410.

[0050] When the radial position of the cutter assembly 310 needs to be adjusted, i.e., a diameter change operation is performed, the second locking component 440 releases the rotation between the adjusting nut 420 and the intermediate shaft 410, and the first locking component 430 locks the rotation between the adjusting nut 420 and the machine base 100. Then, the cutting roller 200 is rotated to drive the intermediate shaft 410 to rotate relative to the machine base 100. At this time, the intermediate shaft 410 rotates relative to the adjusting nut 420. Under the threaded engagement of the drive thread section 411 and the adjusting nut 420, the intermediate shaft 410 moves axially relative to the cutting roller 200 to drive the telescopic component to extend and retract, thereby driving the cutter assembly 310 to move radially along the cutting roller 200 to achieve the diameter change adjustment. During normal paper cutting operation, the second locking component 440 locks the adjusting nut 420 and the intermediate shaft 410. The rotation between shafts 410 is achieved by the first locking assembly 430 releasing the rotation between the adjusting nut 420 and the base 100. When the cutting roller 200 rotates, the adjusting nut 420 and the intermediate shaft 410 rotate together with the cutting roller 200, while the intermediate shaft 410 remains fixed in the axial direction to achieve normal paper cutting operation. This technology only requires driving the cutting roller 200 to perform diameter adjustment. Only one set of power assembly is needed to drive the cutting roller 200 to achieve diameter adjustment and normal paper cutting operation, without the need for a separate power assembly for diameter adjustment, thus reducing manufacturing costs. Furthermore, during normal paper cutting, the rotation between the adjusting nut 420 and the intermediate shaft 410 is locked by the second locking assembly 440, which prevents the cutting blade assembly 310 from shifting and also improves the overall structural strength.

[0051] Specifically, the first locking assembly 430 includes a first locking part 431 mounted on the base 100 and a second locking part 432 disposed on the outer periphery of the adjusting nut 420. The first locking part 431 and the second locking part 432 are matched and engaged. When it is necessary to lock the rotation between the adjusting nut 420 and the base 100, the adjusting nut 420 is rotated to a position where the second locking part 432 is opposite to the first locking part 431. Then the first locking part 431 and the second locking part 432 are matched and engaged to lock the adjusting nut 420.

[0052] To improve the locking stability between the adjusting nut 420 and the base 100, multiple first locking parts 431 may be provided, with the multiple first locking parts 431 arranged in a ring at intervals. Multiple second locking parts 432 may also be provided, with the multiple second locking parts 432 arranged in a ring at intervals around the outer periphery of the adjusting nut 420.

[0053] like Figure 5 and Figure 6As shown, the first locking part 431 in this embodiment includes a pin 4311 and a first locking drive member 4312. The pin 4311 extends radially along the adjusting nut 420. The first locking drive member 4312 is mounted on the base 100. The first locking drive member 4312 drives the pin 4311 to move radially along the adjusting nut 420. The second locking part 432 is a pin hole provided on the outer peripheral wall of the adjusting nut 420. The first locking drive member 4312 drives the pin 4311 to extend into the pin hole to achieve rotational locking of the adjusting nut 420.

[0054] like Figure 5 and Figure 6 As shown, the second locking component 440 in this embodiment includes a locking sleeve 441 and a second locking drive member 442. The locking sleeve 441 is rotatably disposed relative to the base 100. The locking sleeve 441 is axially slidably mounted on the intermediate shaft 410. The locking sleeve 441 and the intermediate shaft 410 are circumferentially fixed. A first engaging portion 4411 is provided at one end of the locking sleeve 441 facing the adjusting nut 420. A second engaging portion 421 is provided at the end face of the adjusting nut 420 facing the locking sleeve 441. The second locking drive member 442 is used to drive the locking sleeve 441 to move closer to and away from the adjusting nut 420, so that the first engaging portion 4411 and the second engaging portion 421 match, engage, and disengage.

[0055] When it is necessary to lock the rotation between the intermediate shaft 410 and the adjusting nut 420, the second locking drive member 442 drives the locking sleeve 441 closer to the adjusting nut 420, so that the first locking part 4411 and the second locking part 421 engage, thereby achieving axial relative locking between the locking sleeve 441 and the adjusting nut 420. Since the locking sleeve 441 and the intermediate shaft 410 are circumferentially fixed, the rotation between the intermediate shaft 410 and the adjusting nut 420 can be locked. When it is necessary to release the rotation between the intermediate shaft 410 and the adjusting nut 420, the second locking drive member 442 drives the locking sleeve 441 away from the adjusting nut 420, so that the first locking part 4411 and the second locking part 421 separate.

[0056] Specifically, such as Figure 5 As shown, the second locking assembly 440 also includes a fixed sleeve 443 fixedly connected to the base 100, a sliding sleeve 444 slidably sleeved in the fixed sleeve 443 along the axial direction, and a locking sleeve 441 rotatably installed in the sliding sleeve 444. In this embodiment, a third rotating bearing 445 is provided between the locking sleeve 441 and the locking sleeve 444. The second locking drive member 442 is fixedly installed at the end of the fixed sleeve 443, and the second locking drive member 442 is connected to the end of the sliding sleeve 444 in a transmission connection.

[0057] In this embodiment, the second locking drive member 442 moves axially within the fixed sleeve 443 by driving the sliding sleeve 444 to move the locking sleeve 441 closer to and away from the adjusting nut 420. The locking sleeve 441 is rotatably installed within the sliding sleeve 444, so that the locking sleeve 441 can rotate with the intermediate shaft 410 in any state without interfering with the movement of the intermediate shaft 410.

[0058] like Figure 6 As shown, both the first snap-fit ​​part 4411 and the second snap-fit ​​part 421 adopt a spline sleeve structure. The first snap-fit ​​part 4411 and the second snap-fit ​​part 421 are engaged by a pair of spline sleeves to achieve relative locking in the circumferential direction.

[0059] like Figure 6 As shown, the outer periphery of the intermediate shaft 410 is provided with a spline groove 412 extending along the axial direction, and the inner periphery of the locking sleeve 441 is provided with a spline block that slides with the spline groove 412. The locking sleeve 441 achieves axial limiting sliding and circumferential limiting locking through the spline block and the spline groove 412 on the intermediate shaft 410.

[0060] In this embodiment, both the second locking drive member 442 and the first locking drive member 4312 are cylinders. In other embodiments, linear drive structures such as electric poles can be used.

[0061] like Figure 1 and Figure 3 As shown, in this embodiment, the left outer periphery of the cutting roller 200 is fitted with a drive gear 220 and a plurality of first rotating bearings 230. The cutting roller 200 is mounted on the base 100 through the first rotating bearings 230. The drive gear 220 is disposed between two adjacent first rotating bearings 230. In use, the external power component is connected to the drive gear 220 for transmission, and the drive gear 220 drives the cutting roller 200 to rotate, so as to realize normal paper cutting and diameter adjustment. Furthermore, the drive gear 220 is disposed between two first rotating bearings 230 to improve the stability of the connection between the external power component and the cutting roller 200.

[0062] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A variable diameter paper cutting device for paper bag production, characterized in that, include: Base (100); A cutting roller (200) is rotatably mounted on the machine base (100); The cutting mechanism (300) includes at least one cutter assembly (310) disposed on the outer periphery of the cutting roller (200), and the cutter assembly (310) is connected to the cutting roller (200) by a telescopic assembly that extends and retracts radially along the cutting roller (200). The variable diameter mechanism (400) includes an intermediate shaft (410), an adjusting nut (420), a first locking assembly (430), and a second locking assembly (440). The intermediate shaft (410) is axially slidably disposed within the cutting roller (200). The intermediate shaft (410) is provided with a drive thread section (411). The adjusting nut (420) is rotatably mounted on the machine base (100). The adjusting nut (420) is threadedly engaged with the drive thread section (411). The intermediate shaft (410) and the telescopic... The components are connected by a drive mechanism. The intermediate shaft (410) is used to drive the telescopic assembly to extend and retract by axial movement within the cutting roller (200), thereby driving the cutter assembly (310) to move radially along the cutting roller (200). The first locking assembly (430) is used to lock and release the rotation between the adjusting nut (420) and the base (100). The second locking assembly (440) is used to lock and release the rotation between the adjusting nut (420) and the intermediate shaft (410). The first locking assembly (430) includes at least one first locking part (431) mounted on the base (100) and at least one second locking part (432) located on the outer periphery of the adjusting nut (420), wherein the first locking part (431) and the second locking part (432) are matched and engaged. The second locking assembly (440) includes a locking sleeve (441) and a second locking drive (442). The locking sleeve (441) is rotatably disposed relative to the base (100). The locking sleeve (441) is axially slidably fitted onto the intermediate shaft (410). The locking sleeve (441) and the intermediate shaft (410) are circumferentially fixed. The end of the locking sleeve (441) is provided with a first snap-fit ​​portion (4411). The adjusting nut (420) is provided with a second snap-fit ​​portion (421) facing the end face of the locking sleeve (441). The second locking drive (442) is used to drive the locking sleeve (441) to move closer to and away from the adjusting nut (420), so that the first snap-fit ​​portion (4411) and the second snap-fit ​​portion (421) match, engage, and disengage. The telescopic assembly includes a plurality of telescopic frames (320) connected between the cutter assembly (310) and the cutting roller (200). Each telescopic frame (320) includes a first connecting rod (321) and a second connecting rod (322). One end of the first connecting rod (321) is hinged to the cutter assembly (310), and the other end is slidably mounted on the cutting roller (200) along the axial direction and fixedly connected to the intermediate shaft (410). One end of the second connecting rod (322) is hinged between the two ends of the first connecting rod (321), and the other end is hinged to the cutting roller (200).

2. The variable diameter paper cutting device according to claim 1, characterized in that: The first locking part (431) includes a pin (4311) and a first locking drive (4312) that drives the pin (4311) to move radially along the adjusting nut (420). The second locking part (432) includes a pin hole provided on the outer peripheral wall of the adjusting nut (420).

3. The variable diameter paper cutting device according to claim 1, characterized in that: The second locking assembly (440) further includes a fixed sleeve (443) fixedly connected to the base (100) and a sliding sleeve (444) slidably sleeved in the fixed sleeve (443). The locking sleeve (441) is rotatably installed in the sliding sleeve (444). The second locking drive (442) is fixedly installed at the end of the fixed sleeve (443) and is drively connected to the end of the sliding sleeve (444).

4. The variable diameter paper cutting device according to claim 1, characterized in that: Both the first snap-fit ​​part (4411) and the second snap-fit ​​part (421) are spline sleeve structures.

5. The variable diameter paper cutting device according to claim 1, characterized in that: The outer periphery of the intermediate shaft (410) is provided with a spline groove (412) extending axially, and the inner periphery of the locking sleeve (441) is provided with a spline block that slides in cooperation with the spline groove (412).

6. The variable diameter paper cutting device according to claim 1, characterized in that: The cutting roller (200) is fitted with a drive gear (220) and a plurality of first rotating bearings (230) on its outer periphery. The cutting roller (200) is mounted on the base (100) through the first rotating bearings (230). The drive gear (220) is located between two adjacent first rotating bearings (230).

7. The variable diameter paper cutting device according to claim 1, characterized in that: The cutting assembly (310) includes a blade holder (311) arranged parallel to the cutting roller (200) and at least one blade (312) mounted on the outside of the blade holder (311).

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