Blade rotary type cut-off machine for PET suction pipe

Abstract

The invention provides a blade rotary cut-off machine for a PET (Polyethylene Terephthalate) suction pipe, which comprises a rack and is characterized in that a rotary cut-off device for rotationally cutting the PET suction pipe is arranged inside the rack; a cutter feeding assembly used for being matched with the rotary cutting device is further fixedly installed in the machine frame. The feed assembly is arranged below the rotary cutting device; a driving motor used for driving the rotary cutting device to rotate is further installed in the machine frame through bolts. According to the straw cutting device, a rotary cutting mode is adopted, the blades rotate and cut the straw by a circle at the same time, and the problem that the straw is crushed due to traditional downward-pressing type cutting is effectively solved; by means of rotary cutting, the cutting face is flatter and smoother, the size precision is higher, and the requirement for high quality of the PET straw in the industries of food and beverage, medical treatment and public health and the like is met.

Description

Technical Field

[0001] The invention relates to the field of straw production equipment, in particular to a rotary blade cutting machine for PET straws. Background Art

[0002] Polyethylene terephthalate (PET), as a thermoplastic polyester material, has many excellent properties, such as high strength, wear resistance, chemical corrosion resistance, high transparency and good biocompatibility. With these properties, PET material has been widely used in the field of straw manufacturing, and PET straws have gradually become the mainstream product on the market.

[0003] PET straws play an indispensable role in many industries such as food and beverage, medical and health care, and cosmetics. For example, in the food and beverage industry, PET straws can safely come into contact with various beverages without adversely affecting the taste and quality of the beverages. In the medical and health field, their good biocompatibility allows them to be used for liquid delivery in some special medical scenarios. However, the material properties of PET straws also bring certain challenges to their production and processing. PET materials have a certain hardness and toughness, which makes traditional straw cutting methods prone to various problems when processing them.

[0004] Most traditional straw cutting machines use downward pressure cutting tools. When facing PET straws, due to the hardness and toughness of PET straws, the downward pressure cutting tools will exert greater pressure on the straws during the cutting process. When the pressure exceeds the limit that the PET straws can withstand, the straws are prone to deformation or even crushing. This will not only affect the cutting quality of the straws, resulting in uneven cutting surfaces and inaccurate dimensions, but will also increase the scrap rate and increase production costs. Summary of the invention

[0005] In order to solve the problem that the conventional straw cutting tools in the prior art cannot adapt to the characteristics of PET straws, resulting in a high scrap rate when cutting PET straws, the present invention provides a rotary blade cutting machine for PET straws;

[0006] The present invention provides a PET straw rotary blade cutting machine that adopts the following technical solution:

[0007] A rotary blade cutting machine for PET straws, comprising a frame, wherein a rotary cutting device for rotary cutting of PET straws is arranged inside the frame; a feed assembly for cooperating with the rotary cutting device is fixedly mounted inside the frame; the feed assembly is arranged below the rotary cutting device; a driving motor for driving the rotary cutting device to rotate is also installed inside the frame by bolts;

[0008] Furthermore, the rotary cutting device comprises a main shaft; the main shaft is rotatably mounted inside the frame; a conveying channel for straws to pass through is provided inside the main shaft; an inner sleeve ring is provided on the outer side of the main shaft; the inner sleeve ring and the main shaft are connected for relative rotation via a bearing; a turntable is installed on a radial side wall of the inner sleeve ring along the main shaft via bolts; an outer facing surface is installed on a side wall of the turntable away from the inner sleeve ring via bolts; a matching wheel is rotatably connected to the outer side wall of the outer facing surface via bolts and bearings; the number of the matching wheels is two; a mounting groove is provided inside the turntable, and a tool assembly is slidably connected to the inside of the mounting groove; an outer sleeve ring is slidably connected to the outer side wall of the inner sleeve ring for making the tool assembly move inside the turntable; the tool assembly can be driven by the rotation of the main shaft;

[0009] Furthermore, one end of the main shaft away from the turntable is connected to the output end of an external motor and can rotate after being powered on;

[0010] Furthermore, the two mating wheels and the tool assembly are arranged in a circular array with the geometric center of the rotating disk as the axis, and the angles of the center connecting lines are all equal;

[0011] Furthermore, the tool assembly includes a driving shaft; a slider is slidably connected in the mounting groove provided in the turntable; a circular key-shaped sliding groove is provided inside the outer surface, the driving shaft passes through the sliding groove and the interior of the slider, one end extends to the outside of the outer surface, and the other end extends to the inside of the inner ring; the driving rod and the slider are connected for relative rotation through a bearing; one end of the driving shaft arranged on the outside of the outer surface is installed with a mounting block by a bolt; a blade is installed on the outer wall of the mounting block; a spring is fixedly connected between the bottom of the slider and the bottom of the mounting groove; the top of the slider extends to the outside of the notch of the mounting groove provided in the turntable, and the top of the slider is set as an inclined surface; the inner wall of the outer ring near the ring opening of the turntable is milled to have a matching bevel angle with the same slope as the inclined surface of the top of the slider;

[0012] Furthermore, a rolling groove is provided on the outer wall of the inner sleeve ring, and a ball is arranged in the rolling groove; the outer sleeve ring and the inner sleeve ring slide relative to each other through the ball;

[0013] Furthermore, one end of the driving shaft disposed inside the inner sleeve ring is fixedly mounted with a driven gear through a key connection; the outer wall of the main shaft is fixedly mounted with a driving gear through a key connection; the driving gear and the driven gear are in a meshing relationship during contact;

[0014] Furthermore, the feed assembly includes a bracket, a cylinder, a push rod, a mounting seat, a connecting rod, and a push block. The bracket is fixedly installed inside the frame by bolts, and the cylinder is installed on the top of the bracket by bolts; the output end of the cylinder is connected to the push rod; the outer wall of the push rod is installed with a mounting seat by bolts; the top of the mounting seat is rotatably connected to one end of the connecting rod through a bearing; the other end of the connecting rod is integrally formed with a push block; the outer wall of the outer ring is provided with a push groove around it; the push block is arranged inside the push groove, and the linear movement of the push block can drive the outer ring to do the same linear movement; the cross-section of the push groove is a trapezoidal structure; the push block is a truncated cone structure as a whole, and there is a transition fit between the push groove and the push groove;

[0015] Furthermore, a transmission pulley is sleeved on the outer wall of the inner sleeve ring; the transmission pulley is fixedly connected to the inner sleeve ring by bolts; the transmission pulley and the output end of the driving motor are connected to each other by a transmission belt;

[0016] Furthermore, a vertical adjustment mechanism for longitudinal adjustment of the rotary cutting device and a horizontal adjustment mechanism for horizontal adjustment of the rotary cutting device are installed inside the frame.

[0017] In summary, the beneficial effects of the present invention are:

[0018] The present invention adopts a rotary cutting method, in which the blade cuts around the straw while rotating, effectively avoiding the problem of the straw being crushed due to the traditional downward pressure cutting method; the rotary cutting makes the cutting surface flatter and smoother, and the dimensional accuracy is higher, meeting the high quality requirements of PET straws in the food and beverage, medical and health industries;

[0019] In addition, the present invention realizes rapid blade feeding and cutting by driving the main shaft to rotate through the driving motor, and the coordinated work of the cylinder to push the push rod, connecting rod and other components, and the cutting speed is significantly improved; compared with the traditional method of cutting one by one, the present technical solution can cut multiple straws continuously, greatly improving production efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall structure of the rotary cutting device of the present invention;

[0022] Figure 3 It is a schematic diagram of the internal structure of the rotary cutting device of the present invention;

[0023] Figure 4 It is a schematic diagram of the cooperation between the rotary cutting device and the feed assembly of the present invention;

[0024] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the middle part.

[0025] As shown in the figure: 1-frame, 11-vertical adjustment mechanism, 12-horizontal adjustment mechanism, 2-rotary cutting device, 21-spindle, 211-conveying channel, 22-inner ring, 23-outer ring, 231-pushing groove, 24-turntable, 25-exterior surface, 250-slide groove, 251-matching wheel, 252-tool assembly, 2521-mounting block, 2522-blade, 253-driving shaft, 2531-slider, 254-driven gear, 2541-bevel, 2542-matching bevel, 2543-spring, 255-driving gear, 26-drive pulley; 27-rolling groove, 28-ball, 3-feed assembly, 31-bracket, 32-cylinder, 33-push rod, 34-mounting seat, 35-connecting rod, 36-push block, 4-drive motor, 41-drive belt. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-5 The present invention is described in further detail:

[0027] A rotary blade cutting machine for PET straws comprises a frame 1, wherein a rotary cutting device 2 for rotary cutting of PET straws is arranged inside the frame 1; a feed assembly 3 for cooperating with the rotary cutting device is fixedly mounted inside the frame 1; the feed assembly 3 is arranged below the rotary cutting device 2; a driving motor 4 for driving the rotary cutting device 2 to rotate is also installed inside the frame 1 through bolts; in this embodiment, the PET straw passes through a conveying channel 211 inside the main shaft 21, and when the straw extends a fixed length, the driving motor 4 is started, and the rotary cutting device 2 rotates through a transmission belt 41; at the same time, the feed assembly 3 drives the rotary cutting device 2 to cut; this structure avoids the problem that the traditional downward pressure cutting tool is easy to crush the straw, and improves the cutting efficiency and quality through rotary cutting;

[0028] like Figure 2 , 3As shown in Figures 4 and 5, the rotary cutting device 2 includes a main shaft 21; the main shaft 21 is rotatably mounted inside the frame 1; a conveying channel 211 for the straw to pass through is provided inside the main shaft 21; an inner sleeve ring 22 is provided on the outer side of the main shaft 21; the inner sleeve ring 22 and the main shaft 21 are relatively rotatably connected via a bearing; a turntable 24 is installed on a radial side wall of the inner sleeve ring 22 along the main shaft 21 via bolts; an outer facing 25 is installed on a side wall of the turntable 24 away from the inner sleeve ring 22 via bolts; a matching wheel 251 is rotatably connected to the outer wall of the outer facing 25 via bolts and bearings; there are two matching wheels 251; the turntable 24 is provided with a There is a mounting groove, and a cutter assembly 252 is slidably connected inside the mounting groove; the outer wall of the inner ring 22 is slidably connected to an outer ring 23 for making the cutter assembly 252 move inside the turntable 24; the cutter assembly 252 can be driven by the rotation of the main shaft 21; in this embodiment, the main shaft 21 provides rotation support, the inner ring 22 rotates relative to the main shaft 21, the turntable 24, the outer facing 25 and the matching wheel 251 are fixed on the inner ring 22, and the cutter assembly 252 slides inside the turntable 24 and is driven to move by the outer ring 23; when the outer ring 23 moves, it can drive the cutter assembly 252 to move toward the straw for cutting;

[0029] like Figure 2 , 3 As shown in FIG. 4 , it is worth noting that a knife groove cooperating with the blade 2522 is provided inside the matching wheel 251, leaving a certain space for the knife groove cutting; in addition, the distance between the matching wheel 251 and the center of the turntable 24 can be adjusted to match PET straws of different specifications;

[0030] One end of the main shaft 21 away from the turntable 24 is connected to the output end of an external motor and can rotate after being powered on;

[0031] like Figure 2 , 3 As shown in , 4, the two matching wheels 251 and the tool assembly 252 are distributed in a circular array with the geometric center of the rotating disk 24 as the axis, and the angles of the center connecting lines are all equal; in this embodiment, the two matching wheels 251 and the tool assembly 252 are distributed in a circular array with the geometric center of the rotating disk 24 as the axis, and the angles of the center connecting lines are all equal; this distribution method ensures the uniformity and stability of the tool assembly 252 during the rotation process; the three-point distribution design also has a clamping effect on the straw; improves the cutting efficiency and cutting quality, and reduces the unevenness during the cutting process;

[0032] like Figure 5As shown, the tool assembly 252 includes a drive shaft 253; a slider 2531 is slidably connected in the mounting groove provided in the turntable 24; a round key-shaped slide groove 250 is provided inside the outer surface 25, and the drive shaft 253 passes through the slide groove 250 and the slider 2531, one end of which extends to the outside of the outer surface 25, and the other end extends to the inside of the inner ring 22; the drive rod and the slider 2531 are relatively rotatably connected through a bearing; one end of the drive shaft 253 arranged on the outside of the outer surface 25 is installed with a mounting block 2521 by bolts; a blade 2522 is installed on the outer wall of the mounting block 2521; the bottom of the slider 2531 is fixed to the bottom of the mounting groove The top of the slider 2531 extends to the outside of the notch of the installation slot opened inside the turntable 24, and the top of the slider 2531 is set as an inclined surface 2541; the inner wall of the outer ring 23 near the ring opening of the turntable 24 is milled to have a matching bevel 2542 with the same slope as the top bevel 2541 of the slider 2531; in this embodiment, when the outer ring 23 moves, the slider 2531 moves downward through the action of the bevel 2541 and the matching bevel 2542, thereby driving the drive shaft 253 and the blade 2522 to move; after the cutting is completed, the spring 2543 resets the slider 2531, and the blade 2522 leaves the straw;

[0033] like Figure 2 , 3 As shown in FIG. 4 , a rolling groove 27 is provided on the outer wall of the inner ring 22, and a ball 28 is arranged in the rolling groove 27; the outer ring 23 slides relative to the inner ring 22 through the ball 28; in this embodiment, when the outer ring 23 moves under the action of an external force, the ball 28 slides in the rolling groove 27 of the inner ring 22, thereby reducing friction resistance and improving the stability and durability of the sliding movement;

[0034] like Figure 4 , 5 As shown, a driven gear 254 is fixedly mounted on one end of the driving shaft 253 disposed inside the inner sleeve 22 through a key connection; a driving gear 255 is fixedly mounted on the outer wall of the main shaft 21 through a key connection; the driving gear 255 and the driven gear 254 are in a contact time meshing relationship; in this embodiment, when the slider 2531 moves downward to make the driven gear 254 mesh with the driving gear 255, the rotation of the main shaft 21 drives the driven gear 254 and the driving shaft 253 to rotate, thereby driving the blade 2522 to rotate; the function of driving the blade 2522 to rotate when the main shaft 21 rotates is realized;

[0035] like Figure 4As shown, the feed assembly 3 includes a bracket 31, a cylinder 32, a push rod 33, a mounting seat 34, a connecting rod 35, and a push block 36. The bracket 31 is fixedly installed inside the frame 1 by bolts, and the cylinder 32 is installed on the top of the bracket 31 by bolts; the output end of the cylinder 32 is connected to the push rod 33; the outer wall of the push rod 33 is installed with a mounting seat 34 by bolts; the top of the mounting seat 34 is rotatably connected to one end of the connecting rod 35 through a bearing; the other end of the connecting rod 35 is integrally formed with a push block 36; the outer wall of the outer ring 23 is provided with a push groove 231 around the periphery; the push block 36 is arranged inside the push groove 231, and the linear movement of the push block 36 can drive the outer ring 23 to do the same linear movement; the push groove 231 is provided with a push groove 231; the push block 36 is arranged inside the push groove 231, and the linear movement of the push block 36 can drive the outer ring 23 to do the same linear movement; The cross section of 31 is a trapezoidal structure; the push block 36 is a truncated cone structure as a whole, and is in transitional cooperation with the push groove 231; when the cylinder 32 is started, the output end drives the push rod 33 to move, and then drives the push block 36 to move in the push groove 231 through the mounting seat 34 and the connecting rod 35; the outer ring 23 further slides on the outer wall of the inner ring 22, and the slider 2531 moves downward through the action of the inclined surface 2541 and the matching bevel 2542, thereby driving the drive shaft 253 and the blade 2522 to move; when the slider 2531 moves downward to make the driven gear 254 mesh with the driving gear 255, the rotation of the main shaft 21 drives the driven gear 254 and the drive shaft 253 to rotate, thereby driving the blade 2522 to rotate;

[0036] like Figure 1 As shown, a transmission pulley 26 is sleeved on the outer wall of the inner sleeve ring 22; the transmission pulley 26 is fixedly connected to the inner sleeve ring 22 by bolts; the transmission pulley 26 and the output end of the driving motor 4 are connected to each other by a transmission belt 41; in this embodiment, the rotation of the main shaft 21 drives the blade 2522 to rotate, and at the same time, the transmission belt 41 of the driving motor 4 drives the inner sleeve ring 22 to rotate in the opposite direction of the main shaft 21, so that the blade 2522 rotates and the inner sleeve ring 22 rotates as a whole to complete the cutting around the straw;

[0037] like Figure 1 As shown, the frame 1 is also provided with a vertical adjustment mechanism 11 for longitudinal adjustment of the rotary cutting device, and a horizontal adjustment mechanism 12 for horizontal adjustment of the rotary cutting device 2. In this embodiment, the position of the rotary cutting device 2 inside the frame 1 can be adjusted by adjusting the vertical adjustment mechanism 11 and the horizontal adjustment mechanism 12, thereby improving the flexibility and adaptability of the equipment and meeting the cutting requirements of PET straws of different specifications and requirements.

[0038] In the above embodiment, the vertical adjustment mechanism 11 can be adjusted longitudinally by a manual rocker or a motor-driven lead screw; the horizontal adjustment mechanism 12 can be adjusted transversely by a guide rail combined with a locking member.

[0039] The implementation principle of the embodiment of the present invention is:

[0040] Install the rotary blade cutting machine for PET straws in a suitable working area to ensure that the frame 1 is stable and all parts are tightly connected; turn on the power, debug the machine, and check whether the drive motor 4, cylinder 32, transmission belt 41 and other parts are working normally; adjust the vertical adjustment mechanism 11 and the horizontal adjustment mechanism 12 according to the specifications of the PET straws to ensure that the position and angle of the rotary cutting device 2 are appropriate; guide the PET straws to be cut to the input end of the frame 1 to ensure that the straws can smoothly enter the conveying channel 211; set the parameters for the fixed length of the straw extension according to the cutting requirements; turn on the power of the spindle motor to make the spindle 21 start to rotate; the cylinder 32 starts, and the output end of the cylinder pushes the push rod 33 forward; the push rod 33 drives the push block 36 to move in the push groove 231 through the mounting seat 34 and the connecting rod 35, and the push block 36 then pushes the outer collar 23 to move along the direction of the spindle 21; the movement of the outer collar 23 is connected to the inclined surface 2541 With the action of the bevel 2542, the slider 2531 moves downward in the slide groove 250 of the interior surface, and at the same time, the driven gear 254 of the drive shaft 253 meshes with the driving gear 255 on the main shaft 21; as the main shaft 21 rotates, the driven gear 254 drives the drive shaft 253 and the blade 2522 to rotate, and the blade 2522 starts to cut the PET straw; at the same time, the driving motor 4 drives the drive pulley 26 and the inner sleeve ring 22 to rotate in the opposite direction of the main shaft 21 through the transmission belt 41, so that the blade 2522 rotates and circles around the straw to cut; when the blade 2522 completes the cutting, the output end of the cylinder 32 retracts, and the push rod 33, the mounting seat 34, the connecting rod 35 and the push block 36 are reset accordingly; under the action of the spring 2543, the slider 2531 and the blade 2522 move upward, leave the straw, and complete one cutting; the cut straw falls out from the output end of the frame 1, ready for the next round of cutting or subsequent processing;

[0041] Collect the cut PET straws and sort or package them as needed; clean the inside of the frame 1 and the cutting area to ensure that the machine is clean and tidy without any residue that affects the next use; regularly check whether the various parts of the machine are worn or loose, and replace or tighten them in time; clean the transmission belt 41, ball bearing 28 and other parts to keep them in good lubrication and operating condition; perform necessary maintenance and care on the cylinder 32, drive motor 4 and other parts to ensure long-term stable operation of the machine.

[0042] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. The various components mentioned in the present invention are common technologies in the existing field. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A rotary blade cutting machine for PET straws, comprising a frame (1), characterized in that The frame (1) is provided with a rotary cutting device (2) for rotary cutting of PET straws; a knife feed assembly (3) for cooperating with the rotary cutting device (2) is also fixedly mounted inside the frame (1); the knife feed assembly (3) is arranged below the rotary cutting device (2); and a driving motor (4) for driving the rotary cutting device (2) to rotate is also installed inside the frame (1) by means of bolts.

2. A rotary blade cutting machine for PET straws according to claim 1, characterized in that The rotary cutting device (2) comprises a main shaft (21); the main shaft (21) is rotatably mounted inside the frame (1); a conveying passage (211) for the straw to pass through is provided inside the main shaft (21); an inner sleeve ring (22) is provided on the outer side of the main shaft (21); the inner sleeve ring (22) and the main shaft (21) are relatively rotatably connected via a bearing; a rotating disk (24) is mounted on a radial side wall of the inner sleeve ring (22) along the main shaft (21) via bolts; a side wall of the rotating disk (24) away from the inner sleeve ring (22) is connected via a screw thread. An outer facing surface (25) is installed by bolts; the outer wall of the outer facing surface (25) is rotatably connected to a matching wheel (251) by bolts and bearings; the number of the matching wheels (251) is two; a mounting groove is provided inside the turntable (24), and a tool assembly (252) is slidably connected inside the mounting groove; the outer wall of the inner sleeve (22) is slidably connected to an outer sleeve (23) for enabling the tool assembly (252) to move inside the turntable (24); the tool assembly (252) can be driven by the rotation of the main shaft (21).

3. A rotary blade cutting machine for PET straws according to claim 2, characterized in that One end of the main shaft (21) away from the rotating disk (24) is connected to the output end of an external motor and can rotate after being powered on.

4. A rotary blade cutting machine for PET straws according to claim 2, characterized in that The two matching wheels (251) and the tool assembly (252) are distributed in a circular array with the geometric center of the rotating disk (24) as the axis, and the angles of the center connecting lines are all equal.

5. A rotary blade cutting machine for PET straws according to claim 4, characterized in that The tool assembly (252) comprises a drive shaft (253); a slider (2531) is slidably connected in the mounting groove provided in the turntable (24); a circular key-shaped slide groove (250) is provided inside the outer surface (25); the drive shaft (253) passes through the slide groove (250) and the slider (2531), one end of which extends to the outside of the outer surface (25) and the other end of which extends to the inside of the inner ring (22); the drive rod and the slider (2531) are connected for relative rotation via a bearing; one end of the drive shaft (253) arranged on the outside of the outer surface (25) is fixed by bolts A mounting block (2521) is provided; a blade (2522) is provided on the outer wall of the mounting block (2521); a spring (2543) is fixedly connected between the bottom of the slider (2531) and the bottom of the mounting groove; the top of the slider (2531) extends to the outside of the notch of the mounting groove provided inside the turntable (24), and the top of the slider (2531) is provided as an inclined surface (2541); the inner wall of the outer ring (23) near the ring opening of the turntable (24) is milled to have a matching bevel angle (2542) having the same slope as the inclined surface (2541) at the top of the slider (2531).

6. A rotary blade cutting machine for PET straws according to claim 5, characterized in that The outer wall of the inner sleeve ring (22) is provided with a rolling groove (27), and a ball (28) is arranged in the rolling groove (27); the outer sleeve ring (23) slides relative to the inner sleeve ring (22) through the ball (28).

7. A rotary blade cutting machine for PET straws according to claim 4, characterized in that One end of the driving shaft (253) disposed inside the inner sleeve ring (22) is fixedly mounted with a driven gear (254) via a key connection; an outer wall of the main shaft (21) is fixedly mounted with a driving gear (255) via a key connection; the driving gear (255) and the driven gear (254) are in a contact time-meshing relationship.

8. A rotary blade cutting machine for PET straws according to claim 4, characterized in that The feed assembly (3) comprises a bracket (31), a cylinder (32), a push rod (33), a mounting seat (34), a connecting rod (35), and a push block (36); the bracket (31) is fixedly mounted inside the frame (1) by bolts; the cylinder (32) is mounted on the top of the bracket (31) by bolts; the output end of the cylinder (32) is connected to the push rod (33); the outer side wall of the push rod (33) is mounted on the mounting seat (34) by bolts; the top of the mounting seat (34) is rotatable by a bearing One end of the connecting rod (35) is connected; the other end of the connecting rod (35) is integrally formed with a push block (36); the outer wall of the outer ring (23) is provided with a push groove (231) around the outer ring; the push block (36) is arranged inside the push groove (231), and the linear movement of the push block (36) can drive the outer ring (23) to make the same linear movement; the cross-section of the push groove (231) is a trapezoidal structure; the push block (36) is a truncated cone structure as a whole, and is in transitional fit with the push groove (231).

9. A rotary blade cutting machine for PET straws according to claim 4, characterized in that A transmission pulley (26) is sleeved on the outer wall of the inner sleeve ring (22); the transmission pulley (26) is fixedly connected to the inner sleeve ring (22) via bolts; and the transmission pulley (26) and the output end of the drive motor (4) are connected to each other via a transmission belt (41).

10. A rotary blade cutting machine for PET straws according to claim 1, characterized in that The frame (1) is also provided with a vertical adjustment mechanism (11) for longitudinal adjustment of the rotary cutting device (2), and a horizontal adjustment mechanism (12) for horizontal adjustment of the rotary cutting device (2).

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