Sheath conveying structure and tail cutting machine

Abstract

The present invention relates to the field of sheath production, and discloses a sheath conveying structure and a tail cutting machine, wherein the sheath conveying structure includes a frame, a conveyor belt assembly, a guide pin, a first correction assembly, and a second correction assembly; the conveyor belt assembly is arranged on the frame; the guide pin is used to insert the flag-shaped sheath, and a plurality of guide pins are arranged, and the guide pin is arranged on the conveyor belt assembly; the first correction assembly is arranged on the frame, and a first limiting channel is provided on the first correction assembly, and the first limiting channel is used for the flag-shaped sheath and the guide pin to pass through, and the first limiting channel is used to limit the upper and lower directions of the flag-shaped sheath; the second correction assembly is arranged on the frame, and a second limiting channel is provided on the second correction assembly, and the second limiting channel is arranged upstream or downstream of the first limiting channel, and the second limiting channel is used for the flag-shaped sheath to pass through. The present invention also provides a tail cutting machine using the conveying structure. The present invention can adjust the position and angle of the flag-shaped sheath, and is easy to use.

Description

Technical Field

[0001] The invention relates to the field of sheath production, in particular to a sheath conveying line and a tail cutting machine. Background Art

[0002] Currently, during the production process, the sheath is made of polymer materials, such as PVC. Before the flag-shaped sheath is assembled to the terminal, it needs to be trimmed. The product molding process causes the product temperature to be high after demolding. The high-temperature sheath will have a certain degree of adhesion, causing different sheaths to stick together. Before trimming the flag-shaped product, the sheaths that are stuck together need to be separated to avoid the situation where individual sheaths are missed due to the adhesion of the sheaths, which reduces the product's qualified rate. In addition, before trimming the flag-shaped sheath, the position and posture of the flag-shaped sheath need to be adjusted.

[0003] Currently, the position adjustment of flag sheaths can be achieved by using, for example, a soft flag sheath automatic guide and conveying mechanism for sheath tail cutting equipment, as disclosed in Chinese Patent Application Publication No. CN101102030A. However, this device cannot adjust the relative position and angle between the sheath and the guide needle, hindering accurate tail cutting by the tail cutting machine. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to solve at least one of the technical problems mentioned above.

[0005] The solution of the present invention to solve its technical problems is:

[0006] A sheath conveying structure comprises a frame, a conveyor belt assembly, a guide needle, a first correction assembly and a second correction assembly; the conveyor belt assembly is arranged on the frame; the guide needle is used to insert a flag-shaped sheath, and a plurality of guide needles are provided, and the guide needle is arranged on the conveyor belt assembly; the first correction assembly is arranged on the frame, and a first limiting channel is provided on the first correction assembly, and the first limiting channel is used for the flag-shaped sheath and the guide needle to pass through, and the first limiting channel is used to limit the upper and lower directions of the flag-shaped sheath to adjust the relative angle between the flag-shaped sheath and the guide needle; the second correction assembly is arranged on the frame, and a second limiting channel is provided on the second correction assembly, and the second limiting channel is arranged upstream or downstream of the first limiting channel, and the second limiting channel is used for the flag-shaped sheath to pass through to adjust the position of the flag-shaped sheath along the length direction of the guide needle.

[0007] As a further improvement of the above technical solution, the first correction component includes an upper guide plate and a lower guide plate, the upper guide plate is arranged on the frame, the lower guide plate is arranged on the frame, and the first limiting channel is arranged between the upper guide plate and the lower guide plate.

[0008] As a further improvement of the above technical solution, the width of the upper guide plate is perpendicular to the extension direction of the first limiting channel and parallel to the horizontal plane, and the width of the upper guide plate gradually increases from the upstream to the downstream direction of the first limiting channel.

[0009] As a further improvement of the above technical solution, the lower guide plate includes an upstream guide plate, a midstream guide plate and a downstream guide plate connected in sequence along the upstream to downstream direction, the midstream guide plate is parallel to the upper guide plate, the midstream guide plate is arranged opposite to the upper guide plate, and an angle is provided between the upstream guide plate and the downstream guide plate, so that an eight-shaped shape is formed between the upstream guide plate and the downstream guide plate.

[0010] As a further improvement of the above technical solution, the second correction component includes a first limiting mechanism and a second limiting plate. The first limiting mechanism is arranged on the frame, and the second limiting plate is arranged on the frame. The second limiting channel is formed between the first limiting mechanism and the second limiting plate. The second limiting plate is used to limit the flag-shaped sleeve.

[0011] As a further improvement of the above technical solution, the second correction component also includes a third limit plate arranged on the frame, and the third limit plate is arranged above or below the second limit plate. A gap is provided between the third limit plate and the second limit plate for the guide needle to pass through.

[0012] As a further improvement of the above technical solution, the first limiting mechanism includes a first limiting plate and a screw nut pair, the screw nut pair is arranged on the frame, the first limiting plate is connected to the movable part of the screw nut pair, and the screw nut pair is used to adjust the distance between the first limiting plate and the second limiting plate to adjust the width of the second limiting channel, and the height of the guide needle is located between the upper side and the lower side of the first limiting plate.

[0013] As a further improvement of the above technical solution, the second limiting plate includes a second upstream plate, a second midstream plate and a second downstream plate connected in sequence from upstream to downstream, and the third limiting plate includes a third upstream plate, a third midstream plate and a third downstream plate connected in sequence from upstream to downstream, the second upstream plate, the second midstream plate and the second downstream plate are respectively flush with the third upstream plate, the third midstream plate and the third downstream plate, and the second upstream plate and the second downstream plate are inclined in a direction away from the first limiting mechanism, so that the second upstream plate and the second downstream plate form an eight-shaped shape.

[0014] As a further improvement of the above technical solution, the first limiting plate includes a first upstream plate, a first midstream plate and a first downstream plate connected in sequence from upstream to downstream, the first midstream plate is arranged opposite to the second midstream plate, the first midstream plate is arranged opposite to the third midstream plate, the first upstream plate is inclined in the direction away from the second upstream plate, so that the width of the second limiting channel at the first upstream plate gradually becomes smaller, and the first downstream plate is inclined in the direction of the second downstream plate.

[0015] The present invention also provides a tail cutting machine, comprising the sheath conveying structure in any of the above technical solutions.

[0016] The beneficial effects of the present invention are as follows: when in use, a flag-shaped sheath is sleeved on the guide needle, and all the guide needles are installed on the conveyor belt assembly. The conveyor belt assembly drives these guide needles to pass through the first limiting channel and the second limiting channel in sequence. When the flag-shaped sheath on the guide needle passes through the first limiting channel, under the limitation of the first limiting channel, for some flag-shaped sheaths whose angles do not meet the requirements, the flag-shaped sheath and the guide needle can be rotated relative to each other, thereby adjusting the relative angle between the flag-shaped sheath and the guide needle. When the flag-shaped sheath on the guide needle passes through the second limiting channel, under the limitation of the second limiting channel, the flag-shaped sheath is made to slide on the guide needle, and the relative position of the flag-shaped sheath and the guide needle is adjusted. The present invention can adjust the position and angle of the flag-shaped sheath during transportation, and is very convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments. Obviously, the drawings described only illustrate some embodiments of the present invention, not all of them. Those skilled in the art can derive other design solutions and drawings based on these drawings without inventive effort.

[0018] Figure 1 is an axonometric view of the sheath delivery structure of the present invention;

[0019] Figure 2It is an exploded view of the frame, upper guide plate, lower guide plate, second limit plate, first limit mechanism, and third limit plate of the present invention;

[0020] Figure 3 It is an axonometric view of the frame, upper guide plate, lower guide plate, second limit plate, first limit mechanism and third limit plate of the present invention.

[0021] In the accompanying drawings: 1-frame, 2-conveyor belt assembly, 3-guide needle, 4-flag-shaped sheath, 51-upper guide plate, 52-lower guide plate, 521-upstream guide plate, 522-midstream guide plate, 523-downstream guide plate, 61-first limiting mechanism, 611-first limiting plate, 6111-first upstream plate, 6112-first midstream plate, 6113-first downstream plate, 612-screw nut pair, 62-second limiting plate, 621-second upstream plate, 622-second midstream plate, 623-second downstream plate, 63-third limiting plate, 631-third upstream plate, 632-third midstream plate, 633-third downstream plate. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interactively without conflicting with each other.

[0023] Reference Figures 1 to 3, a sheath conveying structure includes a frame 1, a conveyor belt assembly 2, a guide pin 3, a first correction assembly and a second correction assembly; the conveyor belt assembly 2 is arranged on the frame 1; the guide pin 3 is used to insert the flag-shaped sheath 4, and a plurality of guide pins 3 are arranged, and the guide pin 3 is arranged on the conveyor belt assembly 2; the first correction assembly is arranged on the frame 1, and a first limiting channel is provided on the first correction assembly, and the first limiting channel is used for allowing the flag-shaped sheath 4 and the guide pin 3 to pass through, and the first limiting channel is used to limit the upper and lower directions of the flag-shaped sheath 4 to adjust the relative angle between the flag-shaped sheath 4 and the guide pin 3; the second correction assembly is arranged on the frame 1, and a second limiting channel is provided on the second correction assembly, and the second limiting channel is arranged upstream or downstream of the first limiting channel, and the second limiting channel is used for allowing the flag-shaped sheath 4 to pass through to adjust the position of the flag-shaped sheath 4 along the length direction of the guide pin 3.

[0024] From the above, it can be seen that when in use, a flag-shaped sheath 4 is sleeved on the guide pin 3, and all the guide pins 3 are installed on the conveyor belt assembly 2. The conveyor belt assembly 2 drives these guide pins 3 to pass through the first limiting channel and the second limiting channel in sequence. When the flag-shaped sheath 4 on the guide pin 3 passes through the first limiting channel, under the limitation of the first limiting channel, for some flag-shaped sheaths 4 whose angles do not meet the requirements, the flag-shaped sheath 4 and the guide pin 3 can be rotated relative to each other, thereby adjusting the relative angle between the flag-shaped sheath 4 and the guide pin 3. When the flag-shaped sheath 4 on the guide pin 3 passes through the second limiting channel, under the limitation of the second limiting channel, the flag-shaped sheath 4 is made to slide on the guide pin 3, and the relative position of the flag-shaped sheath 4 and the guide pin 3 is adjusted. The present invention can adjust the position and angle of the flag-shaped sheath 4 during transportation, and is very convenient to use.

[0025] Preferably, all guide pins 3 are arranged parallel to the horizontal plane so that the first correction component and the second correction component can correct the position, angle, etc. of the sheath on the guide pin 3. In addition, when the second limiting channel limits the flag-shaped sheath 4, the inner wall of the second limiting channel abuts against the edge of the offset flag-shaped sheath 4 to achieve correction of the position of the flag-shaped sheath 4.

[0026] The first correction assembly is used to adjust the relative angle between the flag-shaped sheath 4 and the guide pin 3. In some embodiments, the first correction assembly includes an upper guide plate 51 and a lower guide plate 52. The upper guide plate 51 is arranged on the frame 1, and the lower guide plate 52 is arranged on the frame 1. The first limiting channel is arranged between the upper guide plate 51 and the lower guide plate 52. When in use, the upper guide plate 51 and the lower guide plate 52 are respectively arranged horizontally so that the first limiting channel also extends horizontally. When the flag-shaped sheath 4 swings to a large upward or downward angle, for example, the flag-shaped sheath 4 is vertically upward or downward, the flag-shaped sheath 4 can be limited by the upper guide plate 51 and the lower guide plate 52. Under the contact between the flag-shaped sheath 4 and the upper guide plate 51 or the lower guide plate 52 and the conveying of the guide pin 3 by the conveyor belt assembly 2, the flag-shaped sheath 4 and the guide pin 3 are forced to rotate relative to each other.

[0027] In addition, when there are multiple flag-shaped sheaths 4 bonded to the guide needle 3, these excess flag-shaped sheaths 4 can also fall off from the flag-shaped sheath 4 on the guide needle 3 after the upper guide plate 51 and the lower guide plate 52 touch the flag-shaped sheath 4.

[0028] The upper guide plate 51 is used to correct the flag-shaped sheath 4 with a large upward flipping angle. Under normal circumstances, the flag-shaped sheath 4 is mostly horizontal or downward due to the lower center of gravity. Therefore, when the flag-shaped sheath 4 is upward, the flag-shaped sheath 4 is tightly bonded to the guide pin 3, and it is generally not easy to adjust the relative angle between the flag-shaped sheath 4 and the guide pin 3. For this reason, in some embodiments, the width of the upper guide plate 51 is perpendicular to the extension direction of the first limiting channel and parallel to the horizontal plane, and the width of the upper guide plate 51 gradually increases from the upstream to the downstream of the first limiting channel. The width of the upper guide plate 51 gradually increases from the upstream to the downstream direction of the first limiting channel. Thus, the width of the upper guide plate 51 is gradual. Since the flag-shaped sheath 4 itself is made of elastic materials such as PVC, if the guide needle 3 and the flag-shaped sheath 4 are firmly bonded, the contact position between the upper guide plate 51 and the flag-shaped sheath 4 will change as the conveyor belt assembly 2 drives the guide needle 3 to move, so as to correct the relative position between the flag-shaped sheath 4 and the guide needle 3.

[0029] Optionally, the upper guide plate 51 is configured to be a right triangle, and a right-angled side of the upper guide plate 51 extends along the conveying direction from upstream to downstream of the first limiting channel.

[0030] The lower guide plate 52 is used to correct the angle of the flag sheath 4 that has an excessively large downward tilt angle. Furthermore, it can screen out flag sheaths 4 that are unstable on the guide pin 3. In some embodiments, the lower guide plate 52 includes an upstream guide plate 521, a midstream guide plate 522, and a downstream guide plate 523, which are sequentially connected along the upstream to downstream direction. The midstream guide plate 522 is parallel to the upper guide plate 51 and is disposed opposite the upper guide plate 51. An angle is defined between the upstream guide plate 521 and the downstream guide plate 523, forming a figure eight shape between the upstream guide plate 521 and the downstream guide plate 523. During use, the tilted upstream guide plate 521 can guide flag sheaths 4 that have an excessively large downward tilt angle, allowing the angle of the flag sheath 4 to be gradually adjusted. The tilted setting of the downstream guide plate 523 allows the flag-shaped sheath 4 to separate from the downstream guide plate 523. At the same time, the downstream guide plate 523 is tilted. If there are some flag-shaped sheaths 4 with unstable adhesion among the flag-shaped sheaths 4 that maintain contact with the midstream guide plate 522, the flag-shaped sheaths 4 with unstable adhesion may swing when they leave the support of the midstream guide plate 522, causing these flag-shaped sheaths 4 with unstable adhesion to fall off.

[0031] In actual use, the downstream end of the upper guide plate 51 is located above the midstream guide plate 522, that is, the downstream end of the midstream guide plate 522 is closer to the second limiting channel than the downstream end of the upper guide plate 51. The flag-shaped sheath 4 that has been corrected in angle by the upper guide plate 51 may become loose after relative rotation with the guide needle 3. If the bonding between the two is too loose, the flag-shaped sheath 4 will flip over to contact the midstream guide plate 522. The tilt setting of the lower guide plate 52 can be used to screen out these flag-shaped sheaths 4 that are too loose and unstable in bonding.

[0032] Optionally, the midstream guide plate 522 is arranged parallel to the horizontal plane.

[0033] The second calibration assembly is used to adjust the position of the flag sheath 4 on the guide pin 3. In some embodiments, the second calibration assembly includes a first limiting mechanism 61 and a second limiting plate 62. The first limiting mechanism 61 is disposed on the frame 1, and the second limiting plate 62 is disposed on the frame 1. The first limiting mechanism 61 and the second limiting plate 62 form a second limiting channel, and the second limiting plate 62 is used to limit the position of the flag sheath 4. During use, the first limiting mechanism 61 can be used to adjust the spacing between the first limiting mechanism 61 and the second limiting plate 62, thereby flexibly adjusting the position of the flag sheath 4 on the guide pin 3. The second limiting plate 62 can be used to abut the edge of the flag sheath 4 above the guide pin 3. Optionally, the second limiting plate 62 is used to abut the edge of the flag sheath 4 near the base of the guide pin 3. The user can adjust the extension direction of the second limiting plate 62 to adjust the position of the flag sheath 4 guided by the second limiting plate 62 as the conveyor belt assembly 2 drives the guide pin 3.

[0034] In order to smoothly adjust the edge position of the flag-shaped sheath 4 near the root of the guide pin 3, in some embodiments, the second correction assembly further includes a third limiting plate 63 provided on the frame 1, and the third limiting plate 63 is provided above or below the second limiting plate 62, and a gap is provided between the third limiting plate 63 and the second limiting plate 62 for the guide pin 3 to pass through. When in use, the hole of the guide pin 3 can pass through the gap, that is, the outer diameter of the guide pin 3 is smaller than the width of the gap. Optionally, the third limiting plate 63 is provided below the second limiting plate 62, and the third limiting plate 63 and the second limiting plate 62 are flush with each other, so that the third limiting plate 63 can be used to limit the flag-shaped sheath 4 at the lower part of the guide pin 3, and the second limiting plate 62 is used to limit the flag-shaped sheath 4 at the upper part of the guide pin 3. As the conveyor belt assembly 2 drives the guide needle 3 to move, the third limiting plate 63 and the second limiting plate 62 respectively guide and limit the upper and lower sides of the flag-shaped sheath 4 so as to adjust the flag-shaped sheath 4 to move away from the root of the guide needle 3.

[0035] In the present invention, the root of the guide pin 3 refers to the connection between the guide pin 3 and the conveyor belt assembly.

[0036] The distance between the first limiting mechanism 61 and the second limiting plate 62 is adjustable. To this end, in some embodiments, the first limiting mechanism 61 includes a first limiting plate 611 and a screw nut pair 612. The screw nut pair 612 is arranged on the frame 1. The first limiting plate 611 is connected to the movable part of the screw nut pair 612. The screw nut pair 612 is used to adjust the distance between the first limiting plate 611 and the second limiting plate 62 to adjust the width of the second limiting channel. The height of the guide pin 3 is located between the upper side and the lower side of the first limiting plate 611. When in use, the user can adjust the distance between the first limiting plate 611 and the second limiting plate 62 through the screw nut pair 612. The first limiting plate 611 is used to press against the flag sheath 4, so that the flag sheath 4 moves toward the root of the guide pin 3, that is, the flag sheath 4 moves toward the direction of the second limiting plate 62.

[0037] The second limiting plate 62 is used to adjust the position of the flag-shaped sheath 4 so that the flag-shaped sheath 4 moves away from the root of the guide needle 3. In some embodiments, the second limiting plate 62 includes a second upstream plate 621, a second midstream plate 622, and a second downstream plate 623 connected in sequence from upstream to downstream. The third limiting plate 63 includes a third upstream plate 631, a third midstream plate 632, and a third downstream plate 633 connected in sequence from upstream to downstream. The second upstream plate 621, the second midstream plate 622, and the second downstream plate 623 are flush with the third upstream plate 631, the third midstream plate 632, and the third downstream plate 633 respectively. The second upstream plate 621 and the second downstream plate 623 are tilted in the direction away from the first limiting mechanism 61, so that the second upstream plate 621 and the second downstream plate 623 form an eight-shaped shape. The second upstream plate 621 and the second downstream plate form a figure eight shape. Correspondingly, the third upstream plate 631 and the third downstream plate 633 also form a figure eight shape. By tilting the third upstream plate 631 and the second upstream plate 621 away from the first limiting plate 611, the gap tilts along the horizontal plane away from the base of the guide pin 3 in the upstream-to-downstream direction, thereby facilitating the guided sliding of the flag sheath 4. The third downstream plate 633 and the second downstream plate 623 tilt from the upstream-to-downstream direction toward the base of the guide pin 3, which facilitates the flag sheath 4 on the guide pin 3 to escape from the gap.

[0038] The first limiting plate 611 is used to support the flag-shaped sleeve 4. In some embodiments, the first limiting plate 611 includes a first upstream plate 6111, a first midstream plate 6112 and a first downstream plate 6113 connected in sequence from upstream to downstream. The first midstream plate 6112 is arranged opposite to the second midstream plate 622, and the first midstream plate 6112 is arranged opposite to the third midstream plate 632. The first upstream plate 6111 is inclined in the direction away from the second upstream plate 621, so that the width of the second limiting channel at the first upstream plate 6111 gradually decreases, and the first downstream plate 6113 is inclined in the direction of the second downstream plate 623. The structure is simple and easy to set up. By tilting the first upstream plate 6111 away from the second upstream plate 621, it is beneficial to guide and limit the end of the flag-shaped sheath 4 facing away from the root of the guide needle 3. In conjunction with the setting of the above-mentioned second upstream plate 621 and the third upstream plate 631, the width of the second limiting channel at the first upstream plate 6111 gradually becomes smaller, so that the two ends of the flag-shaped sheath 4 along the length of the guide needle 3 can be limited. It is easy to use. In addition, the first downstream plate 6113 is tilted in the direction of the second downstream plate 623, which can further drive the flag-shaped sheath 4 to move toward the root of the guide needle 3. Under this structure, the above-mentioned third downstream plate 633 and the second downstream plate 623 can limit the flag-shaped sheath 4 to prevent the first limiting plate 611 from pushing the flag-shaped sheath 4 to move too far toward the root of the guide needle 3.

[0039] The present invention also provides a tail cutting machine, including the sheath conveying structure of any of the above-mentioned embodiments. Since the sheath conveying structure has been described above and should be readily understood by those skilled in the art in conjunction with the accompanying drawings, the sheath conveying structure will not be further described here. In actual use, the tail cutting machine is positioned downstream of the second limiting channel.

[0040] The above specifically describes the preferred embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A sheath conveying structure, comprising a frame (1), characterized in that: Also includes: A conveyor belt assembly (2), wherein the conveyor belt assembly (2) is arranged on the frame (1); A guide needle (3), the guide needle (3) is used to insert the flag-shaped sheath (4), a plurality of guide needles (3) are provided, and the guide needles (3) are provided on the conveyor belt assembly (2); A first correction component, the first correction component is arranged on the frame (1), and a first limiting channel is provided on the first correction component, the first limiting channel is used for allowing the flag-shaped sheath (4) and the guide needle (3) to pass through, and the first limiting channel is used to limit the upper and lower directions of the flag-shaped sheath (4) to adjust the relative angle between the flag-shaped sheath (4) and the guide needle (3); a second correction component, the second correction component being arranged on the frame (1), the second correction component being provided with a second limiting channel, the second limiting channel being arranged upstream or downstream of the first limiting channel, the second limiting channel being used for allowing the flag-shaped sheath (4) to pass through so as to adjust the position of the flag-shaped sheath (4) along the length direction of the guide needle (3); The first correction assembly comprises an upper guide plate (51) and a lower guide plate (52), wherein the upper guide plate (51) is arranged on the frame (1), the lower guide plate (52) is arranged on the frame (1), and the first limiting channel is arranged between the upper guide plate (51) and the lower guide plate (52); The lower guide plate (52) includes an upstream guide plate (521), a midstream guide plate (522), and a downstream guide plate (523) connected in sequence along the upstream to downstream direction, the midstream guide plate (522) is parallel to the upper guide plate (51), the midstream guide plate (522) and the upper guide plate (51) are arranged opposite each other, and an angle is provided between the upstream guide plate (521) and the downstream guide plate (523), so that an eight-shaped shape is formed between the upstream guide plate (521) and the downstream guide plate (523); The second correction component comprises a first limiting mechanism (61) and a second limiting plate (62), wherein the first limiting mechanism (61) is arranged on the frame (1), and the second limiting plate (62) is arranged on the frame (1), and a second limiting channel is formed between the first limiting mechanism (61) and the second limiting plate (62), and the second limiting plate (62) is used to limit the flag-shaped sheath (4); The second calibration assembly further comprises a third limit plate (63) arranged on the frame (1), the third limit plate (63) being arranged above or below the second limit plate (62), and a gap for the guide needle (3) to pass through being provided between the third limit plate (63) and the second limit plate (62); The first limiting mechanism (61) includes a first limiting plate (611) and a screw nut pair (612), wherein the screw nut pair (612) is arranged on the frame (1), and the first limiting plate (611) is connected to the movable part of the screw nut pair (612). The screw nut pair (612) is used to adjust the distance between the first limiting plate (611) and the second limiting plate (62) to adjust the width of the second limiting channel. The height of the guide pin (3) is located between the upper side and the lower side of the first limiting plate (611).

2. The sheath delivery structure according to claim 1, characterized in that: The width of the upper guide plate (51) is defined as a direction perpendicular to the extension direction of the first limiting channel and parallel to the horizontal plane. The width of the upper guide plate (51) gradually increases from upstream to downstream of the first limiting channel.

3. The sheath delivery structure according to claim 1, characterized in that: The second limiting plate (62) includes a second upstream plate (621), a second midstream plate (622), and a second downstream plate (623) connected in sequence along the upstream to downstream direction; the third limiting plate (63) includes a third upstream plate (631), a third midstream plate (632), and a third downstream plate (633) connected in sequence along the upstream to downstream direction; the second upstream plate (621), the second midstream plate (622), and the second downstream plate (623) are flush with the third upstream plate (631), the third midstream plate (632), and the third downstream plate (633) respectively in a one-to-one correspondence; the second upstream plate (621) and the second downstream plate (623) are inclined in a direction away from the first limiting mechanism (61), so that the second upstream plate (621) and the second downstream plate (623) form an eight-shaped shape.

4. The sheath delivery structure according to claim 3, characterized in that: The first limiting plate (611) includes a first upstream plate (6111), a first midstream plate (6112) and a first downstream plate (6113) which are sequentially connected from upstream to downstream. The first midstream plate (6112) is arranged opposite to the second midstream plate (622), and the first midstream plate (6112) is arranged opposite to the third midstream plate (632). The first upstream plate (6111) is inclined in a direction away from the second upstream plate (621), so that the width of the second limiting channel at the first upstream plate (6111) gradually decreases. The first downstream plate (6113) is inclined in a direction toward the second downstream plate (623).

5. A tail cutting machine, characterized in that: Comprising the sheath delivery structure according to any one of claims 1-4.

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