Self-cleaning pen cap, pen-type syringe, and working method of pen-type syringe

Abstract

The present invention belongs to the technical field of medical devices, and particularly relates to a self-cleaning pen cap, a pen-type syringe and a working method of the pen-type syringe. The self-cleaning pen cap comprises: a pen cap body for inserting into a pen barrel; a dust-proof mechanism arranged in the pen cap body and comprising: an elastic component and a dust-proof plate connected to the elastic component, wherein the elastic component drives the dust-proof plate to move to the cover opening of the pen cap body, and makes the plane of the dust-proof plate face outward to prevent dust; a dust discharge hole is provided in the cover bottom of the pen cap body; when the pen barrel is inserted into the pen cap body, the elastic component is pressed to drive the dust-proof plate to move toward the cover bottom of the pen cap body and turn over; after the dust-proof plate is turned over, the dust-proof plate moves to squeeze the air in the pen cap body to generate an airflow suitable for blowing dust out of the pen cap body. The self-cleaning pen cap is provided with the dust-proof plate, so that when the pen barrel is separated from the pen cap body, the dust-proof plate is pushed by the elastic component to block the cover opening, thereby preventing dust and other impurities from entering the pen cap body.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and specifically relates to dust prevention of a pen cap, and in particular to a self-cleaning pen cap, a pen-type syringe and a working method of the pen-type syringe. Background Art

[0002] A pen syringe is a commonly used medical device that can be filled with the required injection cartridge, then installed with an injection needle, and finally the drug solution can be injected by pressing or twisting.

[0003] The pen-type injector comprises at least a pen cap and a pen barrel. When using the pen cap, the pen cap needs to be removed from the pen barrel first. However, after the pen cap is removed, dust and other impurities easily enter the space inside the pen cap, making the barrel opening of the pen barrel easily contaminated when the pen cap is inserted into the pen barrel after use.

[0004] Therefore, how to solve the technical problem that the pen cap easily contaminates the pen barrel with the impurities it receives after being separated from the pen barrel is urgently needed to be solved 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 self-cleaning pen cap, a pen-type injector, and a working method of the pen-type injector.

[0007] In the first aspect, an embodiment of the present disclosure provides a self-cleaning pen cap, comprising: a pen cap body for inserting into a pen barrel; a dustproof mechanism, arranged in the pen cap body and comprising: an elastic component and a dustproof plate connected to the elastic component, wherein the elastic component drives the dustproof plate to move to the cover opening of the pen cap body, and makes the plane of the dustproof plate face outward to prevent dust; wherein a dust exhaust hole is provided at the bottom of the cover of the pen cap body; when the pen barrel is inserted into the pen cap body, the elastic component is pressed to drive the dustproof plate to move toward the bottom of the cover of the pen cap body and turn over; after the dustproof plate is turned over, the dustproof plate squeezes the air in the pen cap body by moving to generate an airflow suitable for blowing dust out of the pen cap body.

[0008] In an optional embodiment, the elastic component includes: a spring and a mounting bracket; the mounting bracket is arranged in the pen cap body, and the dustproof plate is arranged on the mounting bracket; one end of the spring is connected to the bottom of the cover, and the other end is against the mounting bracket, and the spring pushes the mounting bracket to move the dustproof plate to the cover opening of the pen cap body.

[0009] In an optional embodiment, the dustproof plate is coaxially arranged at the inner hole of the mounting frame, and a pair of guide columns are provided on the side wall; wherein the inner wall of the pen cap body is axially provided with a pair of guide grooves; the guide columns pass through the mounting frame and extend into the corresponding guide grooves.

[0010] In an optional embodiment, a gear is sleeved on the middle part of the guide column, and a rack is provided on the inner wall of the guide groove; wherein the rack is located at the cover opening of the pen cap body and is adapted to the gear; the dustproof plate moves toward the cover opening and flips over at the cover opening so that the plane faces outward; and the dustproof plate moves toward the bottom of the cover and flips over at the cover opening so that the plane faces inward.

[0011] In an optional embodiment, the guide groove includes: an outer groove and an inner groove; wherein the width of the outer groove is greater than the width of the inner groove; the rack is arranged on the inner wall of the outer groove; the inner groove is adapted to the end of the guide column, and an avoidance area is provided at the rack.

[0012] In an optional embodiment, a force ring is provided on the side of the mounting frame facing the cover opening; the height of the force ring is greater than the radius of the dustproof plate; when the pen barrel is inserted into the pen cover body, the mounting frame is pushed to move by resisting against the force ring.

[0013] In an optional embodiment, one side of the dustproof plate is the plane and the other side is a curved surface; when the pen barrel is inserted into the pen cap body, the dustproof plate is turned over so that the curved surface is close to the barrel mouth of the pen barrel to prevent dust.

[0014] In an optional embodiment, a protrusion is provided on the inner wall of the inner groove at the bottom of the cover; when the dustproof plate is turned over and moved to the bottom of the cover, the guide column cooperates with the protrusion to make the dustproof plate vibrate.

[0015] In a second aspect, an embodiment of the present disclosure further provides a pen-type injector, comprising: the self-cleaning pen cap as described above; and a pen barrel for inserting into the pen cap body; wherein when the pen barrel is engaged with the pen cap body, the pen barrel is pushed by a force ring to prevent shaking.

[0016] On the third aspect, the embodiment of the present disclosure also provides a working method of the pen-type injector as described above, including: driving the dustproof plate to move to the cover opening of the pen cap body through the elastic component, so that the plane of the dustproof plate faces outward to prevent dust; inserting the pen barrel into the pen cap body, so that the elastic component drives the dustproof plate to move toward the bottom of the pen cap body and turn it over, and at the same time, the dustproof plate is turned over so that the arc surface is in contact with the barrel opening of the pen barrel to prevent dust; the dustproof plate moves toward the bottom of the cover to squeeze the air in the pen cap body to blow dust out from the dust exhaust hole at the bottom of the cover.

[0017] The beneficial effects of the present invention are as follows: the self-cleaning pen cap, pen-type syringe and the working method of the pen-type syringe are provided with a dustproof plate, so that when the pen barrel is separated from the pen cap body, the dustproof plate blocks the cover opening through the push of the elastic component, thereby preventing dust and other impurities from entering the pen cap body; and when the pen barrel is inserted into the pen cap body, the elastic component is pressed to drive the dustproof plate to move toward the bottom of the pen cap body and turn over, so that the plane with dust is away from the pen barrel; at the same time, after the dustproof plate is turned over, the dustproof plate squeezes the air in the pen cap body by moving, so that the dust is discharged from the pen cap body along with the air.

[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 purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the 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 pen-type injector provided in an embodiment of the present disclosure;

[0022] Figure 2 A schematic structural diagram of a self-cleaning pen cap with a dustproof plate located at the cap opening provided by an embodiment of the present disclosure;

[0023] Figure 3 A schematic structural diagram of a self-cleaning pen cap with a dustproof plate located at the bottom of the cap provided by an embodiment of the present disclosure;

[0024] Figure 4 A schematic structural diagram of a dustproof mechanism provided in an embodiment of the present disclosure;

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

[0026] Figure 6 A schematic structural diagram of an elastic component provided in an embodiment of the present disclosure.

[0027] In the picture:

[0028] Pen cap body 1, cap opening 11, cap bottom 12, dust discharge hole 13, guide groove 14, outer groove 141, inner groove 142, avoidance area 143, protrusion 144, rack 15;

[0029] Dustproof mechanism 2, elastic component 21, spring 211, mounting frame 212, force ring 213, dustproof plate 22, plane 221, guide column 222, gear 223, arc surface 224;

[0030] Pen holder 3, pen holder mouth 31. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] like Figure 1 、 Figure 2 As shown, at least one embodiment provides a self-cleaning pen cap, comprising: a pen cap body 1 and a dustproof mechanism 2, wherein the pen cap body 1 is used to be inserted into a pen barrel 3, and the pen barrel 3 abuts against and compresses the dustproof mechanism 2 during the insertion process.

[0035] like Figure 2 As shown, in some embodiments, the dustproof mechanism 2 is arranged in the pen cap body 1, and includes: an elastic component 21 and a dustproof plate 22 connected to the elastic component 21. When the pen barrel 3 is not inserted, the elastic component 21 drives the dustproof plate 22 to move to the cover opening 11 of the pen cap body 1, and makes the plane 221 of the dustproof plate 22 face outward.

[0036] In this embodiment, a dustproof plate 22 is provided so that when the pen barrel 3 is separated from the pen cap body 1 , the dustproof plate 22 blocks the cover opening 11 through the push of the elastic component 21 , thereby preventing dust and other impurities from entering the pen cap body 1 .

[0037] like Figure 3As shown, in some embodiments, the cover bottom 12 of the pen cover body 1 is provided with a dust exhaust hole 13 .

[0038] In this embodiment, when the pen barrel 3 is inserted into the pen cap body 1, the elastic component 21 is compressed to drive the dustproof plate 22 to move toward the cover bottom 12 of the pen cap body 1 and flip over during the movement, so that the plane 221 with dust is away from the pen barrel 3, thereby preventing dust from entering the pen barrel 3; at the same time, after the dustproof plate 22 is flipped over, the dustproof plate 22 squeezes the air in the pen cap body 1 by moving, so that the dust is discharged from the pen cap body 1 along with the air.

[0039] like Figure 2 As shown, in some embodiments, the elastic component 21 includes: a spring 211 and a mounting bracket 212; the mounting bracket 212 is arranged in the pen cap body 1, one end of the spring 211 is connected to the cap bottom 12, and the other end is against the mounting bracket 212.

[0040] In this embodiment, the mounting bracket 212 is moved toward the cover opening 11 of the pen cap body 1 by the elastic force of the spring 211, thereby moving the dustproof plate 22 to the cover opening 11 of the pen cap body 1; when the pen barrel 3 covers the pen cap body 1, the pen barrel 3 pushes the mounting bracket 212, causing the spring 211 to be compressed, that is, the mounting bracket 212 drives the dustproof plate 22 to move toward the cover bottom 12 of the pen cap body 1 to squeeze the air in the pen cap body 1.

[0041] like Figure 4 As shown, in some embodiments, the dustproof plate 22 is coaxially arranged at the inner hole of the mounting frame 212, and a pair of guide columns 222 are provided on the side wall; wherein the inner wall of the pen cap body 1 is axially provided with a pair of guide grooves 14; the guide columns 222 pass through the mounting frame 212 and extend into the corresponding guide grooves 14.

[0042] In this embodiment, the dustproof plate 22 is rotatably disposed in the inner hole of the mounting bracket 212 and moves along with the mounting bracket 212 ; at the same time, during the movement, the dustproof plate 22 is guided by the guide groove 14 to rotate or not rotate.

[0043] like Figure 2 As shown, in some embodiments, a gear 223 is sleeved on the middle of the guide column 222 , and a rack 15 is provided on the inner wall of the guide groove 14 ; wherein the rack 15 is located at the cover opening 11 of the pen cap body 1 and is adapted to the gear 223 .

[0044] In some embodiments, the dustproof plate 22 is flipped over at the cover opening 11 so that the plane 221 faces outward during the process of moving toward the cover opening 11; and the dustproof plate 22 is flipped over at the cover opening 11 so that the plane 221 faces inward during the process of moving toward the cover bottom 12.

[0045] In this embodiment, during the movement of the guide column 222, when the gear 223 thereon engages with the rack 15, the guide column 222 will rotate, thereby turning over the dustproof plate 22; wherein, the dustproof plate 22 is turned over at the cover opening 11 to prevent dust and other impurities on the plane 221 from contaminating the barrel opening 31 of the pen holder 3.

[0046] like Figure 5 As shown, in some embodiments, the guide groove 14 includes: an outer groove 141 and an inner groove 142; wherein the width of the outer groove 141 is greater than the width of the inner groove 142; the rack 15 is arranged on the inner wall of the outer groove 141; the inner groove 142 is adapted to the end of the guide column 222, and an avoidance area 143 is provided at the rack 15.

[0047] In this embodiment, when the dustproof plate 22 is flipped over, the gear 223 on the guide column 222 disengages from the rack 15 on the outer groove 141. At this time, the end of the guide column 222 moves along the inner groove 142. Since the end of the guide column 222 is a quadrangular prism, it will not rotate when moving in the inner groove 142.

[0048] In this embodiment, when the dustproof plate 22 is turned over, the gear 223 on the guide column 222 engages with the rack 15 on the outer groove 141. At this time, the end of the guide column 222 is located in the avoidance area 143 to facilitate the rotation of the guide column 222.

[0049] like Figure 6 As shown, in some embodiments, a force ring 213 is provided on the side of the mounting frame 212 facing the cover 11 .

[0050] In this embodiment, when the pen barrel 3 is inserted into the pen cap body 1 , it abuts against the force ring 213 to push the mounting bracket 212 to move.

[0051] In some embodiments, the height of the force ring 213 is greater than the radius of the dustproof plate 22 , so that the dustproof plate 22 will not contact the barrel opening 31 of the pen barrel 3 during the rotation process.

[0052] like Figure 3 As shown, in some embodiments, one side of the dustproof plate 22 is a flat surface 221 , and the other side is a curved surface 224 .

[0053] In this embodiment, after the pen barrel 3 is inserted into the pen cap body 1 , the turned-over dustproof plate 22 brings the arc surface 224 close to the barrel opening 31 of the pen barrel 3 , thereby preventing dust and other impurities from entering the barrel opening 31 .

[0054] like Figure 2 As shown, in some embodiments, a protrusion 144 is provided on the inner wall of the inner groove 142 located at the cover bottom 12 .

[0055] In this embodiment, when the dustproof plate 22 is turned over and moved to the cover bottom 12, the guide column 222 cooperates with the protrusion 144 to vibrate the dustproof plate 22, thereby facilitating the falling of dust on the plane 221 of the dustproof plate 22.

[0056] At least one embodiment further provides a pen-type injector, comprising: a self-cleaning pen cap; and a pen barrel 3 for inserting the pen cap body 1 .

[0057] In this embodiment, when the pen barrel 3 is engaged with the pen cap body 1 , the force ring 213 presses against the pen barrel 3 due to the elastic force of the spring 211 , thereby preventing the pen barrel 3 from shaking.

[0058] Regarding the specific structure and implementation process of the self-cleaning pen cap, please refer to the relevant discussion in the above embodiment and will not be repeated here.

[0059] At least one embodiment also provides a working method of a pen-type injector, comprising: driving the dustproof plate 22 to move to the cover opening 11 of the pen cap body 1 by the elastic component 21, so that the flat surface 221 of the dustproof plate 22 faces outward to prevent dust; inserting the pen barrel 3 into the pen cap body 1, so that the elastic component 21 drives the dustproof plate 22 to move toward the cover bottom 12 of the pen cap body 1 and turn it over, and at the same time, the dustproof plate 22 is turned over so that the curved surface 224 is in contact with the barrel opening 31 of the pen barrel 3 to prevent dust; and moving the dustproof plate 22 toward the cover bottom 12 to squeeze the air in the pen cap body 1 to blow dust out from the dust exhaust hole 13 of the cover bottom 12.

[0060] Regarding the specific structure and implementation process of the pen-type injector, please refer to the relevant discussion in the above embodiments and will not be repeated here.

[0061] In summary, the present self-cleaning pen cap, pen-type syringe and working method of the pen-type syringe are provided with a dustproof plate 22, so that when the pen barrel 3 is separated from the pen cap body 1, the dustproof plate 22 blocks the cover opening 11 through the push of the elastic component 21, thereby preventing dust and other impurities from entering the pen cap body 1; and when the pen barrel 3 is inserted into the pen cap body 1, the elastic component 21 is pressed to drive the dustproof plate 22 to move toward the cover bottom 12 of the pen cap body 1 and turn over, so that the plane 221 with dust is away from the pen barrel 3; at the same time, after the dustproof plate 22 is turned over, the dustproof plate 22 squeezes the air in the pen cap body 1 by moving, so that the dust is discharged from the pen cap body 1 along with the air.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 self-cleaning pen cap, characterized in that: include: The pen cap body (1) is used to be inserted into the pen barrel (3); The dustproof mechanism (2) is arranged in the pen cap body (1) and comprises: an elastic component (21) and a dustproof plate (22) connected to the elastic component (21), wherein the elastic component (21) drives the dustproof plate (22) to move to the cover opening (11) of the pen cap body (1), and makes the plane (221) of the dustproof plate (22) face outward to prevent dust; The bottom (12) of the pen cap body (1) is provided with a dust discharge hole (13); When the pen barrel (3) is inserted into the pen cap body (1), the elastic component (21) is pressed to drive the dustproof plate (22) to move toward the cover bottom (12) of the pen cap body (1) and turn over; After the dustproof plate (22) is turned over, the dustproof plate (22) moves to squeeze the air in the pen cap body (1) to generate an airflow suitable for blowing dust out of the pen cap body (1); The elastic component (21) comprises: a spring (211) and a mounting frame (212); The mounting frame (212) is arranged in the pen cap body (1), and the dustproof plate (22) is arranged on the mounting frame (212); One end of the spring (211) is connected to the cover bottom (12), and the other end is against the mounting frame (212). The spring (211) pushes the mounting frame (212) to move the dustproof plate (22) to the cover opening (11) of the pen cover body (1); The dustproof plate (22) is coaxially arranged at the inner hole of the mounting frame (212), and a pair of guide columns (222) are arranged on the side wall; wherein A pair of guide grooves (14) are formed on the inner wall of the pen cap body (1) along the axial direction; The guide column (222) passes through the mounting frame (212) and extends into the corresponding guide slot (14); A gear (223) is sleeved on the middle of the guide column (222), and a rack (15) is provided on the inner wall of the guide groove (14); wherein The rack (15) is located at the cover opening (11) of the pen cover body (1) and is adapted to the gear (223); The dustproof plate (22) moves toward the cover opening (11) and turns over at the cover opening (11) so that the plane (221) faces outward; and The dustproof plate (22) moves toward the cover bottom (12) and turns over at the cover opening (11) so that the plane (221) faces inward.

2. The self-cleaning pen cap according to claim 1, characterized in that: The guide groove (14) comprises an outer groove (141) and an inner groove (142); wherein The width of the outer groove (141) is greater than the width of the inner groove (142); The rack (15) is arranged on the inner wall of the outer groove (141); The inner groove (142) is adapted to the end of the guide column (222), and an avoidance area (143) is provided at the rack (15).

3. The self-cleaning pen cap according to claim 1, characterized in that: A stress ring (213) is provided on one side of the mounting frame (212) facing the cover opening (11); The height of the force ring (213) is greater than the radius of the dustproof plate (22); When the pen barrel (3) is inserted into the pen cap body (1), the mounting frame (212) is pushed to move by abutting against the force ring (213).

4. The self-cleaning pen cap according to claim 1, characterized in that: One side of the dustproof plate (22) is the flat surface (221), and the other side is a curved surface (224); When the pen barrel (3) is inserted into the pen cap body (1), the dustproof plate (22) is turned over so that the arc surface (224) is close to the barrel opening (31) of the pen barrel (3) to prevent dust.

5. The self-cleaning pen cap according to claim 2, characterized in that: The inner wall of the inner groove (142) located at the cover bottom (12) is provided with a protrusion (144); When the dustproof plate (22) turns over and moves to the cover bottom (12), the guide column (222) cooperates with the protrusion (144) to cause the dustproof plate (22) to vibrate.

6. A pen-type injector, characterized in that: include: The self-cleaning pen cap according to any one of claims 1 to 5; as well as The pen barrel (3) is used to insert the pen cap body (1); wherein When the pen barrel (3) is engaged with the pen cap body (1), the pen barrel (3) is pushed by the force ring (213) to prevent shaking.

7. A method for operating the pen-type injector according to claim 6, characterized in that: include: The dustproof plate (22) is driven by the elastic component (21) to move to the cover opening (11) of the pen cover body (1), so that the plane (221) of the dustproof plate (22) faces outward to prevent dust; The pen barrel (3) is inserted into the pen cap body (1), so that the elastic component (21) drives the dustproof plate (22) to move toward the cover bottom (12) of the pen cap body (1) and turn over, and at the same time, the dustproof plate (22) turns over so that the arc surface (224) is in contact with the barrel opening (31) of the pen barrel (3) to prevent dust; The dust-proof plate (22) moves toward the cover bottom (12) to squeeze the air in the pen cover body (1) so as to blow the dust out from the dust discharge hole (13) of the cover bottom (12).

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