Sleeve end forming equipment for injection pen and production process of sleeve end forming equipment

Abstract

The invention belongs to the technical field of plastic processing, and particularly relates to sleeve end forming equipment for an injection pen and a production process of the sleeve end forming equipment for the injection pen. The heating plate is arranged on the inner wall of the cooling pool and is provided with a heating hole; the mold is elastically arranged on the side wall of the cooling pool, and a forming end inside the mold is located in the heating hole; the clamping mechanism is used for clamping the casing pipe and driving the casing pipe to be inserted into the mold, so that the end part of the casing pipe is propped against the forming end head for hot melting and closing up; after the end of the sleeve abuts against the forming end, the mold is stressed to drive the forming end to move towards the water cooling position, and in the moving process, the forming end is driven to rotate through a threaded channel in the side wall so that the end of the sleeve can be closed up. According to the sleeve end forming equipment for the injection pen, the mold rotates in the moving process through the threaded channel, so that the formed end rotates to facilitate closing of the molten end, and the closing is smoother.

Description

Technical Field

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

[0002] The cannula for the injection pen is made of plastic, with one end being open and the other end being closed.

[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 cavity of the mold by the hot melt method. When the end of the plastic tube is hot-melted, the hot-melted end is formed into a closed end again through the molding end in the cavity; however, this molding method makes the molded end uneven and easy to stick and produce wiredrawing.

[0004] Therefore, how to solve the problem that the end of the sleeve after hot-melt forming is uneven and easy to draw is a technical problem that technical personnel in this field need to solve urgently.

[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 a first aspect, an embodiment of the present disclosure provides a cannula tip molding device for an injection pen, comprising: a cooling pool, in which a water cooling position is arranged; a heating plate, which is provided with a heat insulating 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 close the end by hot melting; 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 close; after the molding tip is located in the water cooling position, the clamping mechanism resets and moves so that the mold drives 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 penetrates one end toward the molding end, the second spiral groove is closed at one end toward the molding end, and the other end of the first spiral groove is connected with 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, and the spring blocks the transverse channel to prevent the guide block from detaching from the second spiral groove; when installing the mold, 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 a cylinder that 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 center of the mold; the bottom of the forming groove is the forming end.

[0013] In an optional embodiment, a nozzle is provided in the cooling pool; the nozzle sprays cooling water to the mold located in the water cooling position to cool and solidify the sleeve at the molding 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] In a second aspect, the disclosed embodiment also provides a production process for a sleeve tip molding device for an injection pen, comprising: elastically setting the mold on the side wall of a cooling pool, with the molding tip inside the mold 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 tip to be hot-melt closed; opening a threaded channel in the side wall of the mold, so that when the mold is subjected to force, the molding tip is driven to extend into a 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 sleeve to be closed; and after the molding tip is located in the water cooling position, the clamping mechanism is reset to cause the mold to drive the molding tip 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 molding end, and the second spiral groove is closed at one end toward the molding end, and the other end of the first spiral groove is connected with 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 allows the mold to rotate during the movement through the threaded channel, so that the molding end can help the melted end to close and close more smoothly by rotating; 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 demolding, avoiding the situation where direct removal is prone to wire drawing.

[0018] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose 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, this article specifically cites preferred embodiments and provides detailed descriptions as follows in conjunction with the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 1 A schematic diagram of the structure of a cannula tip molding device for an injection pen provided in an embodiment of the present disclosure; Figure 2 A schematic diagram of an exploded structure of a heating plate and a mold provided in an embodiment of the present disclosure; Figure 3 A schematic diagram of the structure of a heating plate provided in an embodiment of the present disclosure; Figure 4A schematic diagram of the structure of a threaded channel on a mold provided by an embodiment of the present disclosure; Figure 5 A schematic diagram of the structure of a sleeve inserted into a molding groove provided in an embodiment of the present disclosure; Figure 6 A schematic structural diagram of a clamping mechanism provided in an embodiment of the present disclosure.

[0022] In the figure: Heating plate 1, heating hole 11, guide block 12; Cooling pool 2, water cooling position 21, nozzle 22; The mold 3, the molding groove 31, the molding end 311, the threaded channel 32, the first spiral groove 321, the second spiral groove 322, and the traverse channel 323; Clamping mechanism 4, clamping component 41, pushing component 42; Casing 5; Spring 6. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, in the drawings, the thickness of the components may be exaggerated or reduced in order to effectively describe the technical content.

[0025] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0026] 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 arranged; a heating plate 1, which is provided with a heat insulation layer on the 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 3 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 is pressed against the forming end head 311 to close the end with hot melt; after the end of the sleeve 5 is pressed against the forming end head 311, the mold 3 is forced to drive the forming end head 311 to move toward the water cooling position 21, and during the movement, the threaded channel 32 of the side wall drives the forming end head 311 to rotate to help the end of the sleeve 5 to close; after the forming end head 311 is located at the water cooling position 21, the clamping mechanism 4 resets and moves to make the mold 3 drive the forming end head 311 to reverse to help the end of the sleeve 5 to be demolded.

[0027] In this embodiment, the heating plate 1 heats the forming end 311 of the mold 3, and when the end of the sleeve 5 abuts against the forming end 311, it is heated and melted. After being inserted to a certain depth, the clamping mechanism 4 abuts against the mold 3, so that the mold 3 rotates and moves 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 cooling 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 reverses to help the end of the sleeve 5 to be demolded, avoiding the situation where direct removal is prone to wire drawing.

[0028] like Figure 3 , Figure 4 As shown, in some embodiments, a guide block 12 is disposed 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.

[0029] 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 is through at one end toward the molding end 311, and the second spiral groove 322 is closed at one end toward the molding 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 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.

[0030] 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 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.

[0031] In this embodiment, in order to realize the 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 be disengaged, thereby realizing the limiting 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.

[0032] like Figure 3 As shown, in some embodiments, the shape of the mold 3 is cylindrical and matches 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 .

[0033] 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.

[0034] like Figure 2 As shown, in some embodiments, a nozzle 22 is provided in the cooling pool 2; the nozzle 22 sprays cooling water to 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.

[0035] 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.

[0036] In this embodiment, a limiting slot is provided on the clamping component 41, and the sleeve 5 is arranged in the limiting slot and protrudes a certain length from the limiting slot, 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.

[0037] At least one embodiment also provides a production process for a sleeve terminal 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 terminal 311 inside it is located in the heating hole 11; clamping the sleeve 5 through the clamping mechanism 4, and driving the sleeve 5 to be inserted into the mold 3, so that the end of the sleeve 5 is against the molding terminal 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 terminal 311 is driven to extend into the water cooling position 21, and during the movement, the molding terminal 311 is driven to rotate through the threaded channel 32 on the side wall to help the end of the sleeve 5 to be closed; and after the molding terminal 311 is located at the water cooling position 21, the clamping mechanism 4 is reset and moved to cause the mold 3 to drive the molding terminal 311 to reverse to help the end of the sleeve 5 to be demolded.

[0038] In some embodiments, a guide block 12 is provided on the inner wall of the heating hole 11; a spring 6 is sleeved 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 molding end 311, and the second spiral groove 322 is closed at one end toward the molding 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.

[0039] Regarding the specific structure and implementation process of the cannula tip molding device for the injection pen, please refer to the relevant discussion in the above embodiments, which will not be repeated here.

[0040] To summarize, the sleeve end molding device for the injection pen allows the mold 3 to rotate during 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 is prone to wire drawing.

[0041] 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.

[0042] In this article, 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 another element or layer, or there may be intermediate elements or layers. In contrast, 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 intermediate 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.

[0043] 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..." modify the entire list of elements when following a 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.

[0044] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limited. As used herein, the singular articles "one", "an" and "the" may also be intended to include plural forms, unless it is clearly indicated above that this is not the case. 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 specific order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0045] 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. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, so 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 superior to other implementations, aspects, or designs. On the contrary, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0046] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is 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 a limitation of the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used in this document unless explicitly 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.

[0048] Spatially relative terms, such as "inside", "outside", "below", "below", "down", "above", "on", etc., may be used herein to facilitate description of the relationship of one element or feature to another element or feature as illustrated in the figure. In addition to the orientation depicted in the figure, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is turned over, the elements described as "below" or "below" other elements or features will be oriented to be "above" other elements or features. Therefore, the example term "below" can cover the orientation above and below. The device can be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0049] In the above discussion, unless otherwise stated, the terms "about," "approximately," "substantially," etc., when used to describe a numerical value, mean a variation of + / - 10% of the value.

[0050] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope 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 disposed on its periphery, arranged on the inner wall of the cooling pool (2), and having a heating hole (11); A mold (3) is elastically arranged on a side wall of the cooling pool (2), and a 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; wherein After the end of the sleeve (5) abuts against the forming end head (311), the mold (3) is forced 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 close the end of the sleeve (5); After the molding 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 molding 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, characterized in that: 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) so that the mold (3) rotates when it is moved by force.

3. The cannula tip molding device for an injection pen according to claim 2, characterized in that: The threaded channel (32) comprises: a first spiral groove (321) and a second spiral groove (322); One end of the first spiral groove (321) is connected toward the molding end head (311), one end of the second spiral groove (322) is closed toward the molding 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 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) into the second spiral groove (322).

4. The cannula tip molding device for an injection pen according to claim 3, characterized in that: The side wall of the mold (3) is sleeved 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 traverse 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 a cylinder that matches the heating hole (11); During the resetting 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, characterized in that: The mold (3) has a molding groove (31) at the axis thereof adapted to the sleeve (5); The bottom of the forming groove (31) is the forming end head (311).

7. The cannula tip molding device for an injection pen according to claim 6, characterized in that: A nozzle (22) is provided in the cooling pool (2); The nozzle (22) sprays cooling water onto 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, characterized in that: 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) so that the sleeve (5) extends into the mold (3).

9. A production process of the cannula tip molding device for an injection pen as claimed in claim 1, characterized in that: include: The mold (3) is elastically arranged on the side wall of the cooling pool (2), and the molding end head (311) inside the mold (3) 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 head (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 head (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 injection pens 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 sleeved 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); One end of the first spiral groove (321) is connected toward the molding end head (311), one end of the second spiral groove (322) is closed toward the molding 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 compressed 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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