Injection pen cannula tip molding equipment and production process

Abstract

The present invention belongs to the technical field of plastic processing, and specifically relates to a cannula end molding device for an injection pen and a production process thereof. The cannula end molding device for an injection pen comprises: a cooling pool, in which a water cooling position is provided; a heating plate, which is arranged on the inner wall of the cooling pool and has a heating hole; a mold, which is elastically arranged on the side wall of the cooling pool, and the molding end therein is located in the heating hole; and a clamping mechanism, which is used to clamp the cannula and drive the cannula to be inserted into the mold, so that the end of the cannula abuts against the molding end to be hot-melt closed; wherein after the end of the cannula abuts against the molding end, the mold is forced to drive the molding end to move toward the water cooling position, and during the movement, the molding end is driven to rotate through the threaded channel on the side wall to help the cannula end to close. The cannula end molding device for an injection pen rotates the mold during the movement through the threaded channel, so that the molding end can help the melted end to close by rotating, and the closing is smoother.

Description

Technical Field

[0001] The present invention belongs to the technical field of plastic processing, specifically relates to heat molding, and in particular to a cannula end molding device for an injection pen and a production process thereof. Background Art

[0002] The cannula for an injection pen is made of plastic, with an open end and a closed end.

[0003] The blank of the sleeve is a plastic tube with both ends open. In the related art, the end of the plastic tube is inserted into the mold cavity by the hot melt method. After the end of the plastic tube is hot-melted, the hot-melted end is re-molded into a closed end through the molding end in the mold cavity; however, this molding method makes the molded end uneven and prone to adhesion and drawing.

[0004] Therefore, how to solve the problem that the end of the sleeve after hot-melt forming is uneven and easy to be drawn is a technical problem that needs to be solved urgently by those skilled in the art.

[0005] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the Invention

[0006] The embodiments of the present disclosure at least provide a cannula tip molding device for an injection pen and a production process thereof.

[0007] In the first aspect, an embodiment of the present disclosure provides a cannula tip molding device for an injection pen, comprising: a cooling pool, which is provided with a water cooling position; a heating plate, which is provided with a heat insulation layer on the periphery and is arranged on the inner wall of the cooling pool and has a heating hole; a mold, which is elastically arranged on the side wall of the cooling pool, and the molding tip inside it is located in the heating hole; and a clamping mechanism, which is used to clamp the cannula and drive the cannula to be inserted into the mold, so that the end of the cannula abuts against the molding tip to be hot-melt closed; wherein after the end of the cannula abuts against the molding tip, the mold is forced to drive the molding tip to move toward the water cooling position, and during the movement, the molding tip is driven to rotate through the threaded channel of the side wall to help the end of the cannula to be closed; after the molding tip is located at the water cooling position, the clamping mechanism resets and moves to cause the mold to drive the molding tip to reverse to help the end of the cannula to be demolded.

[0008] In an optional embodiment, a guide block is provided on the inner wall of the heating hole; the guide block extends into the threaded channel so that the mold rotates when it is moved by force.

[0009] In an optional embodiment, the threaded channel includes: a first spiral groove and a second spiral groove; the first spiral groove passes through one end toward the forming end head, the second spiral groove is closed toward one end toward the forming end head, and the other end of the first spiral groove is connected to the other end of the second spiral groove through a transverse channel; when installing the mold, the mold is inserted into the heating hole so that the guide block moves along the first spiral groove and through the transverse channel into the second spiral groove.

[0010] In an optional embodiment, the side wall of the mold is provided with a spring, which blocks the transverse channel to prevent the guide block from detaching from the second spiral groove; when the mold is installed, the mold is inserted into the heating hole and squeezes the spring to open the transverse channel.

[0011] In an optional embodiment, the shape of the mold is cylindrical and matches the heating hole; during the resetting movement of the clamping mechanism, the mold retreats and scrapes off the cooling water remaining on the side wall through the heating hole.

[0012] In an optional embodiment, a forming groove adapted to the sleeve is opened at the axis of the mold; the bottom of the forming groove is the forming end head.

[0013] In an optional embodiment, a nozzle is provided in the cooling pool; the nozzle sprays cooling water toward the mold located in the water cooling position to cool and solidify the sleeve at the forming end; wherein cooling water remains in the threaded channel to continue cooling during the mold retraction process.

[0014] In an optional embodiment, the clamping mechanism includes: a clamping component and a pushing component; wherein after the clamping component clamps the sleeve, the pushing component pushes the clamping component toward the mold to allow the sleeve to extend into the mold.

[0015] On the second aspect, the embodiment of the present disclosure also provides a production process for a sleeve end molding device for an injection pen, which includes: elastically setting the mold on the side wall of the cooling pool, and the molding end inside it is located in the heating hole; clamping the sleeve by a clamping mechanism, and driving the sleeve to be inserted into the mold, so that the end of the sleeve is against the molding end to be hot-melt closed; opening a threaded channel on the side wall of the mold, so that when the mold is subjected to force, the molding end is driven to extend into the water cooling position, and during the movement, the molding end is driven to rotate through the threaded channel on the side wall to help the end of the sleeve to be closed; and after the molding end is located in the water cooling position, the clamping mechanism resets and moves to cause the mold to drive the molding end to reverse to help the end of the sleeve to be demolded.

[0016] In an optional embodiment, a guide block is provided on the inner wall of the heating hole; a spring is provided on the side wall of the mold, and the spring blocks the transverse channel; the threaded channel includes: a first spiral groove and a second spiral groove; the first spiral groove passes through one end toward the forming end head, and the second spiral groove is closed toward one end of the forming end head, and the other end of the first spiral groove is connected to the other end of the second spiral groove through the transverse channel; when installing the mold, the mold is inserted into the heating hole and squeezes the spring to open the transverse channel, so that the guide block moves along the first spiral groove and through the transverse channel into the second spiral groove.

[0017] The beneficial effect of the present invention is that the sleeve end molding device for the injection pen rotates the mold during the movement through the threaded channel, so that the molding end helps to close the melted end and the closing is smoother by rotation; at the same time, when the molding end moves to the water cooling position, the molding end is just completed, and then the molding end is cooled by water cooling to accelerate the solidification of the sleeve end; after a certain period of time, the clamping mechanism retreats to reset the mold, and at this time the molding end is reversed to help the sleeve end be demolded, avoiding the situation where direct removal easily produces wire drawing.

[0018] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purposes and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited herein and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic structural diagram of a cannula tip molding device for an injection pen provided in an embodiment of the present disclosure;

[0022] Figure 2 A schematic diagram of an exploded structure of a heating plate and a mold provided in an embodiment of the present disclosure;

[0023] Figure 3 A schematic structural diagram of a heating plate provided in an embodiment of the present disclosure;

[0024] Figure 4 A schematic structural diagram of a threaded channel on a mold provided by an embodiment of the present disclosure;

[0025] Figure 5 A schematic structural diagram of a sleeve inserted into a molding groove provided in an embodiment of the present disclosure;

[0026] Figure 6 A schematic structural diagram of a clamping mechanism provided in an embodiment of the present disclosure.

[0027] In the picture:

[0028] Heating plate 1, heating hole 11, guide block 12;

[0029] Cooling pool 2, water cooling position 21, nozzle 22;

[0030] Mold 3, forming groove 31, forming end 311, threaded channel 32, first spiral groove 321, second spiral groove 322, traverse channel 323;

[0031] Clamping mechanism 4, clamping component 41, pushing component 42;

[0032] Casing 5;

[0033] Spring 6. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. In addition, in the drawings, the thickness of components may be exaggerated or reduced in order to effectively describe the technical content.

[0036] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0037] like Figures 1 to 5As shown, at least one embodiment provides a cannula tip molding device for an injection pen, which includes: a cooling pool 2, in which a water cooling position 21 is provided; a heating plate 1, which is provided with a heat insulating layer on its periphery and is arranged on the inner wall of the cooling pool 2 and has a heating hole 11; a mold 3, which is elastically arranged on the side wall of the cooling pool 2, and the molding tip 311 inside the mold is located in the heating hole 11; and a clamping mechanism 4, which is used to clamp the cannula 5 and drive the cannula 5 to insert into the mold 3, so that the cannula 5 The end portion abuts against the forming end head 311 to be closed by hot melting; wherein after the end portion of the sleeve 5 abuts against the forming end head 311, the mold 3 is driven by force to drive the forming end head 311 to move toward the water cooling position 21, and during the movement, the threaded channel 32 on the side wall drives the forming end head 311 to rotate to help the end of the sleeve 5 to be closed; after the forming end head 311 is located at the water cooling position 21, the clamping mechanism 4 resets and moves to cause the mold 3 to drive the forming end head 311 to reverse to help the end of the sleeve 5 to be demolded.

[0038] In this embodiment, the heating plate 1 heats the forming end 311 of the mold 3. When the end of the sleeve 5 is in contact with the forming end 311, it is heated and melted. After being inserted to a certain depth, the clamping mechanism 4 is in contact with the mold 3, so that the mold 3 is rotated and moved forward, that is, the forming end 311 in the mold 3 helps the melted end to close and close more smoothly by rotating; when the forming end 311 moves to the water cooling position 21, the forming of the end is just completed, and then the forming end 311 is cooled by water to accelerate the solidification of the end of the sleeve 5; after a certain period of time, the clamping mechanism 4 retreats to reset the mold 3. At this time, the forming end 311 is reversed to help the end of the sleeve 5 to be demolded, avoiding the situation where direct removal easily produces drawing.

[0039] like Figure 3 、 Figure 4 As shown, in some embodiments, a guide block 12 is provided on the inner wall of the heating hole 11; the guide block 12 extends into the threaded channel 32 so that the mold 3 rotates when it is moved by force.

[0040] like Figure 4 As shown, in some embodiments, the threaded channel 32 includes: a first spiral groove 321 and a second spiral groove 322; the first spiral groove 321 passes through one end toward the forming end head 311, and the second spiral groove 322 is closed at one end toward the forming end head 311, and the other end of the first spiral groove 321 is connected to the other end of the second spiral groove 322 through a transverse channel 323; when installing the mold 3, the mold 3 is inserted into the heating hole 11 so that the guide block 12 moves along the first spiral groove 321 and through the transverse channel 323 to the second spiral groove 322.

[0041] In some embodiments, a spring 6 is provided on the side wall of the mold 3, and the spring 6 blocks the transverse channel 323 to prevent the guide block 12 from detaching from the second spiral groove 322; when the mold 3 is installed, the mold 3 is inserted into the heating hole 11 and squeezes the spring 6 to open the transverse channel 323.

[0042] In this embodiment, in order to achieve rapid loading and unloading of the mold 3, the threaded channel 32 is composed of two spiral grooves. The first spiral groove 321 is used for the guide block 12 to enter until the compression spring 6 exposes the transverse channel 323, and then enters the second spiral groove 322 through the transverse channel 323. At this time, the guide block 12 can only move in the second spiral groove 322 and cannot disengage, thereby achieving the limitation of the mold 3; when disassembly is required, it is only necessary to compress the spring 6 to expose the transverse channel 323 again, so that the guide block 12 can move from the second spiral groove 322 to the first spiral groove 321 to disengage.

[0043] like Figure 3 As shown, in some embodiments, the shape of the mold 3 is cylindrical and adapted to the heating hole 11 ; during the resetting movement of the clamping mechanism 4 , the mold 3 retreats and scrapes off the cooling water remaining on the side wall through the heating hole 11 .

[0044] like Figure 5 As shown, in some embodiments, a forming groove 31 adapted to the sleeve 5 is opened at the axis center of the mold 3; the bottom of the forming groove 31 is the forming end 311.

[0045] like Figure 2 As shown, in some embodiments, a nozzle 22 is provided in the cooling pool 2; the nozzle 22 sprays cooling water toward the mold 3 located in the water cooling position 21 to cool and solidify the sleeve 5 at the forming end 311; wherein, cooling water remains in the threaded channel 32 to continue cooling during the retraction process of the mold 3.

[0046] like Figure 6 As shown, in some embodiments, the clamping mechanism 4 includes: a clamping component 41 and a pushing component 42; after the clamping component 41 clamps the sleeve 5, the pushing component 42 pushes the clamping component 41 toward the mold 3 to allow the sleeve 5 to extend into the mold 3.

[0047] In this embodiment, a limiting slot is provided on the clamping component 41, and the sleeve 5 is provided in the limiting slot and protrudes out of the limiting slot by a certain length, and the protruding length is just enough to extend into the forming end 311 of the forming groove 31; then the control module controls the pushing component 42 to push the clamping component 41 to drive the sleeve 5 to move toward the mold 3. When the pushing component 42 contacts the mold 3, the end of the sleeve 5 also moves to the standard position. At this time, the end of the sleeve 5 is located in the forming end 311 and contacts the bottom of the forming end 311.

[0048] At least one embodiment also provides a production process for a cannula end molding device for an injection pen, which includes: elastically setting the mold 3 on the side wall of the cooling pool 2, and the molding end 311 inside it is located in the heating hole 11; clamping the cannula 5 through the clamping mechanism 4, and driving the cannula 5 to be inserted into the mold 3, so that the end of the cannula 5 is against the molding end 311 to be hot-melted and closed; opening a threaded channel 32 on the side wall of the mold 3, so that when the mold 3 is subjected to force, the molding end 311 is driven to extend into the water cooling position 21, and during the movement, the molding end 311 is driven to rotate through the threaded channel 32 on the side wall to help the end of the cannula 5 to be closed; and after the molding end 311 is located in the water cooling position 21, the clamping mechanism 4 resets and moves so that the mold 3 drives the molding end 311 to reverse to help the end of the cannula 5 to be demolded.

[0049] In some embodiments, a guide block 12 is provided on the inner wall of the heating hole 11; a spring 6 is provided on the side wall of the mold 3, and the spring 6 blocks the transverse channel 323; the threaded channel 32 includes: a first spiral groove 321 and a second spiral groove 322; the first spiral groove 321 passes through one end toward the forming end 311, and the second spiral groove 322 is closed toward one end of the forming end 311, and the other end of the first spiral groove 321 is connected to the other end of the second spiral groove 322 through the transverse channel 323; when installing the mold 3, the mold 3 is inserted into the heating hole 11 and squeezes the spring 6 to open the transverse channel 323, so that the guide block 12 moves along the first spiral groove 321 and through the transverse channel 323 to the second spiral groove 322.

[0050] Regarding the specific structure and implementation process of the cannula tip molding device for an injection pen, please refer to the relevant discussion in the above embodiments and will not be repeated here.

[0051] To sum up, the sleeve end molding device for the injection pen rotates the mold 3 during the movement through the threaded channel 32, so that the molding end 311 can help the melted end to close and close more smoothly by rotating; at the same time, when the molding end 311 moves to the water cooling position 21, the molding of the end is just completed, and then the molding end 311 is cooled by water to accelerate the solidification of the end of the sleeve 5; after a certain period of time, the clamping mechanism 4 retreats to reset the mold 3. At this time, the molding end 311 reverses to help the end of the sleeve 5 to be demolded, avoiding the situation where direct removal easily produces wire drawing.

[0052] Herein, when it is mentioned that a first component is located on a second component, this may mean that the first component may be directly formed on the second component or a third component may be interposed between the first component and the second component.

[0053] As used herein, when an element or layer is referred to as being "located on," "engaged to," "connected to," "attached to," or "coupled to" another element or layer, it may be directly located on, engaged, connected, attached to, or coupled to the other element or layer, or there may be intervening elements or layers. Conversely, when an element is referred to as being "directly on," "directly engaged to," "directly connected to," "directly attached to," or "directly coupled to" another element or layer, there may be no intervening elements or layers. Other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0054] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." when following a list of elements modify the entire list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0055] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limiting. As used herein, the singular articles "a", "an" and "the" may also be intended to include plural forms, unless otherwise clearly indicated herein. The terms "comprise", "include" and "have" are inclusive and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the particular order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0056] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Thus, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Instead, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0057] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0058] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used herein unless expressly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.

[0059] Spatially relative terms, such as "inside," "outside," "below," "beneath," "down," "above," "on," etc., may be used herein to describe the relationship of one element or feature to another element or feature as illustrated in the figures. In addition to the orientations depicted in the figures, spatially relative terms may be intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as being "below" or "below" other elements or features will be oriented to be "above" the other elements or features. Thus, the example term "below" may encompass both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0060] In the above discussion, unless otherwise indicated, the terms "about," "approximately," "substantially," etc., when used to describe a numerical value, mean a variation of + / - 10% of the value.

[0061] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A cannula tip molding device for an injection pen, characterized in that: include: A cooling pool (2) having a water cooling position (21) disposed therein; A heating plate (1) having a heat insulating layer provided on its periphery, arranged on the inner wall of the cooling pool (2), and provided with a heating hole (11); A mold (3) is elastically arranged on the side wall of the cooling pool (2), and the molding end (311) inside the mold (3) is located in the heating hole (11); and The clamping mechanism (4) is used to clamp the sleeve (5) and drive the sleeve (5) to be inserted into the mold (3), so that the end of the sleeve (5) abuts against the molding end (311) to be closed by hot melting; After the end of the sleeve (5) abuts against the forming end (311), the mold (3) is forced to drive the forming end (311) to move toward the water cooling position (21), and during the movement, the threaded channel (32) provided on the side wall of the mold (3) drives the forming end (311) to rotate to help close the end of the sleeve (5); After the forming end head (311) is located at the water cooling position (21), the clamping mechanism (4) is reset to allow the mold (3) to drive the forming end head (311) to reverse, thereby facilitating demoulding of the end of the sleeve (5).

2. The cannula tip molding device for an injection pen according to claim 1, wherein: The inner wall of the heating hole (11) is provided with a guide block (12); The guide block (12) extends into the threaded channel (32) to enable the mold (3) to rotate when it is moved by force.

3. The cannula tip molding device for an injection pen according to claim 2, wherein: The threaded channel (32) comprises: a first spiral groove (321) and a second spiral groove (322); The first spiral groove (321) is connected to one end of the forming end head (311), the second spiral groove (322) is closed to one end of the forming end head (311), and the other end of the first spiral groove (321) is connected to the other end of the second spiral groove (322) via a transverse channel (323); When the mold (3) is installed, the mold (3) is inserted into the heating hole (11) so that the guide block (12) moves along the first spiral groove (321) and through the transverse channel (323) into the second spiral groove (322).

4. The cannula tip molding device for an injection pen according to claim 3, wherein: The side wall of the mold (3) is provided with a spring (6), and the spring (6) blocks the transverse movement channel (323) to prevent the guide block (12) from detaching from the second spiral groove (322); When the mold (3) is installed, the mold (3) is inserted into the heating hole (11) and presses the spring (6) to open the transverse channel (323).

5. The cannula tip molding device for an injection pen according to claim 4, characterized in that: The shape of the mold (3) is cylindrical and matches the heating hole (11); During the reset movement of the clamping mechanism (4), the mold (3) retreats and scrapes away the cooling water remaining on the side wall through the heating hole (11).

6. The cannula tip molding device for an injection pen according to claim 5, wherein: The mold (3) has a molding groove (31) at its axis that matches the sleeve (5); The bottom of the forming groove (31) is the forming end (311).

7. The cannula tip molding device for an injection pen according to claim 6, wherein: A nozzle (22) is provided in the cooling pool (2); The nozzle (22) sprays cooling water toward the mold (3) located in the water cooling position (21) to cool and solidify the sleeve (5) at the molding end (311); Wherein, cooling water remains in the threaded channel (32) to continuously cool the mold (3) during its retreat.

8. The cannula tip molding device for an injection pen according to claim 7, wherein: The clamping mechanism (4) comprises: a clamping component (41) and a pushing component (42); wherein After the clamping assembly (41) clamps the sleeve (5), the pushing assembly (42) pushes the clamping assembly (41) toward the mold (3) to allow the sleeve (5) to extend into the mold (3).

9. A production process for the cannula tip molding device for an injection pen according to claim 1, characterized in that: include: The mold (3) is elastically arranged on the side wall of the cooling pool (2), and the internal molding end (311) thereof is located in the heating hole (11); The sleeve (5) is clamped by a clamping mechanism (4), and the sleeve (5) is driven to be inserted into the mold (3), so that the end of the sleeve (5) abuts against the molding end (311) to be closed by hot melting; A threaded channel (32) is provided on the side wall of the mold (3), so that when the mold (3) is subjected to force, the molded end (311) is driven to extend into the water cooling position (21), and during the movement, the threaded channel (32) on the side wall drives the molded end (311) to rotate to help close the end of the sleeve (5); and After the forming end head (311) is located at the water cooling position (21), the clamping mechanism (4) is reset to allow the mold (3) to drive the forming end head (311) to reverse, thereby facilitating demoulding of the end of the sleeve (5).

10. The production process of the cannula tip molding device for an injection pen according to claim 9, characterized in that: The inner wall of the heating hole (11) is provided with a guide block (12); The side wall of the mold (3) is provided with a spring (6), and the spring (6) blocks the transverse movement channel (323); The threaded channel (32) comprises: a first spiral groove (321) and a second spiral groove (322); The first spiral groove (321) is connected to one end of the forming end head (311), the second spiral groove (322) is closed to one end of the forming end head (311), and the other end of the first spiral groove (321) is connected to the other end of the second spiral groove (322) via a transverse channel (323); When the mold (3) is installed, the mold (3) is inserted into the heating hole (11) and the spring (6) is squeezed to open the transverse channel (323), so that the guide block (12) moves along the first spiral groove (321) and through the transverse channel (323) into the second spiral groove (322).

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