CN119950899B - Self-cleaning pen cap, pen-type syringe, and working method of pen-type syringe - Google Patents

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

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

Technical Field

The invention belongs to the technical field of medical equipment, and particularly relates to a pen cap dust prevention device, in particular to a self-cleaning pen cap, a pen type injector and a working method of the pen type injector.

Background

Pen-type injector is a common medical apparatus, which can be filled with the needed injection cartridge, then is installed with injection needle, finally realizes the injection of liquid medicine by pressing or screwing.

The pen type injector at least comprises a pen cap and a pen container, wherein the pen cap is required to be removed from the pen container when in use, but after the pen cap is removed, the space in the pen cap is easy to enter impurities such as dust, so that the mouth of the pen container is easy to be polluted when the pen container is inserted into the pen cap after being used.

Therefore, how to solve the technical problem that the pen cap easily contaminates the pen container with the received impurities after being separated from the pen container is a urgent need for solving the problem of the skilled person.

It should be noted that the above information disclosed in this background section is only for understanding the background of the inventive concept and therefore the above description is not to be construed as constituting prior art information.

Disclosure of Invention

The embodiment of the disclosure at least provides a self-cleaning pen cap, a pen-type injector and a working method of the pen-type injector.

According to the first aspect, the embodiment of the disclosure provides a self-cleaning pen cap, which comprises a pen cap body, a dustproof mechanism and a dustproof plate, wherein the pen cap body is used for inserting a pen container, the dustproof mechanism is arranged in the pen cap body and comprises an elastic component and the dustproof plate connected with the elastic component, the elastic component drives the dustproof plate to move to a cap opening of the pen cap body and enables the plane of the dustproof plate to face outwards to prevent dust, a dust discharging hole is formed in the cap bottom of the pen cap body, when the pen container is inserted into the pen cap body, the elastic component is pressed to drive the dustproof plate to move towards the cap bottom of the pen cap body and turn over, and after the dustproof plate turns over, the dustproof plate presses air in the pen cap body through movement to generate air flow suitable for blowing dust out of the pen cap body.

In an alternative embodiment, the elastic assembly comprises a spring and a mounting frame, wherein the mounting frame is arranged in the pen cover body, the dust-proof plate is arranged on the mounting frame, one end of the spring is connected with the cover bottom, the other end of the spring abuts against the mounting frame, and the spring enables the dust-proof plate to move to the cover opening of the pen cover body by pushing the mounting frame.

In an alternative embodiment, the dust-proof plate is coaxially arranged at the inner hole of the mounting frame, the side wall of the dust-proof plate is provided with a pair of guide posts, the inner wall of the pen cap body is provided with a pair of guide grooves along the axial direction, and the guide posts penetrate through the mounting frame and extend into the corresponding guide grooves.

In an alternative embodiment, a gear is sleeved in the middle of the guide post, a rack is arranged on the inner wall of the guide groove, the rack is located at the position of a cover opening of the pen cover body and is matched with the gear, the dust-proof plate moves towards the cover opening and turns over at the position of the cover opening to enable a plane to face outwards, and the dust-proof plate moves towards the cover bottom and turns over at the position of the cover opening to enable the plane to face inwards.

In an alternative embodiment, the guide groove comprises an outer layer groove and an inner layer groove, wherein the width of the outer layer groove is larger than that of the inner layer groove, the rack is arranged on the inner wall of the outer layer groove, the inner layer groove is matched with the end part of the guide post, and an avoidance area is arranged at the rack.

In an alternative embodiment, a stress ring is arranged on one side of the mounting frame, facing the cover opening, of the mounting frame, the height of the stress ring is larger than the radius of the dust-proof plate, and when the pen container is inserted into the pen cover body, the mounting frame is pushed to move by abutting against the stress ring.

In an alternative embodiment, one side of the dustproof plate is the plane, the other side of the dustproof plate is the cambered surface, and when the pen container is inserted into the pen cap body, the cambered surface is close to the nozzle of the pen container through turnover so as to prevent dust.

In an alternative embodiment, the inner wall of the inner layer groove at the bottom of the cover is provided with a bulge, and when the dust-proof plate is turned over and moves to the bottom of the cover, the guide post is matched with the bulge to vibrate the dust-proof plate.

In a second aspect, the embodiment of the disclosure also provides a pen injector, which comprises the self-cleaning pen cap and a pen container for being inserted into a pen cap body, wherein when the pen container is clamped with the pen cap body, the pen container is pushed by a stress ring to prevent shaking.

According to the working method of the pen-type injector, the elastic component drives the dust-proof plate to move to the position of the cover opening of the pen cover body to enable the plane of the dust-proof plate to face outwards for dust prevention, the pen container is inserted into the pen cover body to enable the elastic component to drive the dust-proof plate to move towards the cover bottom of the pen cover body and turn over, meanwhile, the dust-proof plate enables the cambered surface to be attached to the barrel opening of the pen container for dust prevention through the turn over, and air in the pen cover body is extruded through the movement of the dust-proof plate towards the cover bottom to blow out dust from the dust discharging hole of the cover bottom.

The self-cleaning pen cap, the pen injector and the working method of the pen injector have the advantages that the dustproof plate is arranged, when the pen container is separated from the pen cap body, the dustproof plate is pushed by the elastic component to block the cap opening, so that dust and other impurities are prevented from entering the pen cap body, when the pen container is inserted into the pen cap body, the elastic component is pressed to drive the dustproof plate to move towards the bottom of the pen cap body and turn over, so that a plane with dust is far away from the pen container, and meanwhile, after the dustproof plate turns over, the dustproof plate extrudes air in the pen cap body through movement, so that the dust is discharged out of the pen cap body along with the air.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a pen injector according to an embodiment of the present disclosure;

Fig. 2 is a schematic structural view of a self-cleaning pen cap when a dust-proof plate is located at a cap opening according to an embodiment of the disclosure;

fig. 3 is a schematic structural view of a self-cleaning pen cap when a dust-proof plate is located at the bottom of the cap according to an embodiment of the disclosure;

fig. 4 is a schematic structural view of a dust-proof mechanism according to an embodiment of the present disclosure;

fig. 5 is a schematic structural view of a guide groove according to an embodiment of the present disclosure;

Fig. 6 is a schematic structural diagram of an elastic component according to an embodiment of the disclosure.

In the figure:

The pen cap comprises a pen cap body 1, a cap opening 11, a cap bottom 12, a dust exhaust hole 13, a guide groove 14, an outer layer groove 141, an inner layer groove 142, an avoidance area 143, a bulge 144 and a rack 15;

the dustproof mechanism 2, the elastic component 21, the spring 211, the mounting frame 212, the stress ring 213, the dustproof plate 22, the plane 221, the guide post 222, the gear 223 and the cambered surface 224;

a pen container 3 and a pen container opening 31.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. In addition, in the drawings, the thickness of the parts may be exaggerated or reduced for effective description of technical contents.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

As shown in fig. 1 and 2, at least one embodiment provides a self-cleaning pen cap, which comprises a pen cap body 1 and a dustproof mechanism 2, wherein the pen cap body 1 is used for inserting a pen container 3, and the pen container 3 is propped against the dustproof mechanism 2 and compresses the dustproof mechanism 2 during the insertion process.

As shown in fig. 2, in some embodiments, the dustproof mechanism 2 is disposed in the pen cap body 1 and includes an elastic component 21 and a dustproof plate 22 connected to the elastic component 21, and when the pen container 3 is not inserted, the elastic component 21 drives the dustproof plate 22 to move to the cap opening 11 of the pen cap body 1, and the plane 221 of the dustproof plate 22 faces outwards.

In the present embodiment, the dust-proof plate 22 is provided, so that when the brush holder 3 is separated from the cap body 1, the cap opening 11 is blocked by pushing of the elastic member 21, thereby preventing foreign substances such as dust from entering the cap body 1.

As shown in fig. 3, in some embodiments, the cover bottom 12 of the pen cover body 1 is provided with a dust discharge hole 13.

In this embodiment, when the pen container 3 is inserted into the pen cap body 1, the elastic component 21 is pressed to drive the dust-proof plate 22 to move towards the cap bottom 12 of the pen cap body 1 and turn over during the movement, so that the plane 221 with dust is far away from the pen container 3, and thus dust is prevented from entering the pen container 3, and meanwhile, after the dust-proof plate 22 turns over, the dust-proof plate 22 presses the air in the pen cap body 1 by moving, so that the dust is discharged out of the pen cap body 1 along with the air.

As shown in fig. 2, in some embodiments, the elastic assembly 21 includes a spring 211 and a mounting bracket 212, and the mounting bracket 212 is disposed in the pen cap body 1, one end of the spring 211 is connected to the cap base 12, and the other end abuts against the mounting bracket 212.

In the present embodiment, the mounting frame 212 moves towards the cap opening 11 of the pen cap body 1 by the elastic force of the spring 211, so that the dust-proof plate 22 moves to the cap opening 11 of the pen cap body 1, and when the pen container 3 covers the pen cap body 1, the pen container 3 pushes the mounting frame 212 to press the spring 211, that is, the mounting frame 212 drives the dust-proof plate 22 to move towards the cap bottom 12 of the pen cap body 1 to squeeze the air in the pen cap body 1.

As shown in fig. 4, in some embodiments, the dust-proof plate 22 is coaxially disposed at the inner hole of the mounting frame 212, and the side wall is provided with a pair of guide posts 222, wherein the inner wall of the pen cap body 1 is axially provided with a pair of guide grooves 14, and the guide posts 222 penetrate through the mounting frame 212 and extend into the corresponding guide grooves 14.

In this embodiment, the dust-proof plate 22 is rotatably disposed in the inner hole of the mounting frame 212 and moves along with the mounting frame 212, and at the same time, the dust-proof plate 22 is rotated or not rotated by the guide of the guide groove 14 during the movement.

As shown in fig. 2, in some embodiments, a gear 223 is sleeved at the middle part of the guide post 222, and a rack 15 is arranged on the inner wall of the guide groove 14, wherein the rack 15 is positioned at the cover opening 11 of the pen cover body 1 and is matched with the gear 223.

In some embodiments, the dust guard 22 is turned over at the lid opening 11 to face the flat surface 221 outward during movement toward the lid opening 11, and the dust guard 22 is turned over at the lid opening 11 to face the flat surface 221 inward during movement toward the lid bottom 12.

In the present embodiment, during the movement of the guide post 222, the guide post 222 rotates when the gear 223 thereon is engaged with the rack 15, so that the dust-proof plate 22 is turned over, wherein the dust-proof plate 22 is turned over at the cap 11 to prevent impurities such as dust on the plane 221 from contaminating the barrel opening 31 of the barrel 3.

As shown in fig. 5, in some embodiments, the guide groove 14 includes an outer layer groove 141 and an inner layer groove 142, wherein the outer layer groove 141 has a width greater than that of the inner layer groove 142, the rack 15 is provided on an inner wall of the outer layer groove 141, the inner layer groove 142 is fitted to an end of the guide post 222, and a relief area 143 is provided at the rack 15.

In the present embodiment, when the turnover of the dust-proof plate 22 is completed, the gear 223 on the guide post 222 is separated from the rack 15 on the outer layer groove 141, and at this time, the end of the guide post 222 moves along the inner layer groove 142, and the end of the guide post 222 is a quadrangular prism, so that no rotation occurs when moving in the inner layer groove 142.

In the present embodiment, when the dust-proof plate 22 is turned over, the gear 223 on the guide post 222 is engaged with the rack 15 on the outer layer slot 141, and the end of the guide post 222 is located in the avoiding area 143, so that the guide post 222 rotates.

As shown in fig. 6, in some embodiments, the side of the mounting bracket 212 facing the lid opening 11 is provided with a force ring 213.

In the present embodiment, when the pen container 3 is inserted into the pen cap body 1, the mounting bracket 212 is pushed to move by abutting against the force-receiving ring 213.

In some embodiments, the height of the force ring 213 is greater than the radius of the dust guard 22 so that the dust guard 22 does not come into contact with the barrel port 31 of the barrel 3 during rotation.

As shown in fig. 3, in some embodiments, the dust guard 22 has a planar surface 221 on one side and a cambered surface 224 on the other side.

In the present embodiment, after the pen container 3 is inserted into the cap body 1, the turned dust-proof plate 22 makes the arc surface 224 close to the nozzle 31 of the pen container 3, thereby preventing the nozzle 31 from entering impurities such as dust.

As shown in fig. 2, in some embodiments, the inner wall of the inner layer trough 142 at the lid bottom 12 is provided with protrusions 144.

In the present embodiment, when the dust-proof plate 22 is turned over and moved to the cover bottom 12, the guide posts 222 vibrate the dust-proof plate 22 by cooperating with the protrusions 144, thereby facilitating the falling of dust on the plane 221 of the dust-proof plate 22.

At least one embodiment also provides a pen injector comprising a self-cleaning pen cap, and a pen barrel 3 for insertion into the pen cap body 1.

In the present embodiment, when the pen container 3 is engaged with the pen cap body 1, the force ring 213 is pressed against the pen container 3 by the elastic force of the spring 211, so that the pen container 3 does not shake.

For the specific structure and implementation of the self-cleaning pen cap, refer to the relevant discussion in the above embodiments, and are not repeated here.

At least one embodiment also provides a working method of the pen type injector, which comprises the steps of driving the dustproof plate 22 to move to the position of the cover opening 11 of the pen cover body 1 through the elastic component 21, enabling the plane 221 of the dustproof plate 22 to face outwards to prevent dust, inserting the pen cover body 1 through the pen container 3, enabling the elastic component 21 to drive the dustproof plate 22 to move towards the cover bottom 12 of the pen cover body 1 and turn over, enabling the cambered surface 224 to be attached to the barrel opening 31 of the pen container 3 through the turnover, and enabling the dustproof plate 22 to move towards the cover bottom 12 to squeeze air in the pen cover body 1 to blow out dust from the dust discharging hole 13 of the cover bottom 12.

For the specific structure and implementation of the pen injector, reference is made to the relevant discussion in the above embodiments, and no further description is given here.

In summary, the self-cleaning pen cap, the pen injector and the working method of the pen injector are characterized in that the dustproof plate 22 is arranged, when the pen container 3 is separated from the pen cap body 1, the dustproof plate 22 is pushed by the elastic component 21 to block the cap opening 11, so that dust and other impurities are prevented from entering the pen cap body 1, when the pen container 3 is inserted into the pen cap body 1, the elastic component 21 is pressed to drive the dustproof plate 22 to move towards the cap bottom 12 of the pen cap body 1 and turn over, so that the plane 221 with dust is far away from the pen container 3, and meanwhile, after the dustproof plate 22 turns over, the dustproof plate 22 presses the air in the pen cap body 1 through movement, so that the dust is discharged out of the pen cap body 1 along with the air.

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

In this document, when an element or layer is referred to as being "on," "engaged to," "connected to," "attached to," or "coupled to" another element or layer, it can be directly on, engaged, connected, attached, or coupled to the other element or layer, or intervening elements or layers may be present. 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 intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a similar fashion (e.g., "between" pairs "directly between," "adjacent" pairs "directly adjacent," etc.). As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example embodiments of the present disclosure will be described in more detail herein with reference to the accompanying drawings. As used herein, expressions such as "at least one of a..once more, modify an 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 a only a, b only, c only, both a and b, both a and c, both b and c, or all of a, b and c.

The terminology used herein is for the purpose of describing particular example configurations only and is not intended to be limiting. As used herein, the singular articles "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein should not be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. Additional or alternative steps may be employed.

As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that a 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 within more than one embodiment of the disclosure, such that the phrases are not necessarily referring to the same embodiment. As used herein, the terms "exemplary," "exemplary," and the like are used for purposes of illustration, example, or description. Any embodiment, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments, aspects, or designs. Rather, use of the terms "example," "exemplary," and the like are intended to present concepts in a concrete fashion.

In describing embodiments of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Moreover, terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed above could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

Spatially relative terms, such as "inner," "outer," "lower," "upper," and the like, may be used herein to facilitate the description of one element or feature's relationship to another element or feature as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" may encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

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

With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims (7)

1. A self-cleaning pen cap, comprising:

the pen cap body (1) is used for inserting a pen container (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 with the elastic component (21), wherein the elastic component (21) drives the dustproof plate (22) to move to the cap opening (11) of the pen cap body (1) and enables the plane (221) of the dustproof plate (22) to face outwards to prevent dust, wherein the dustproof mechanism is a novel pen cap, and the dustproof mechanism is a novel pen cap

The cover bottom (12) of the pen cover body (1) is provided with a dust discharging hole (13);

When the pen container (3) is inserted into the pen cap body (1), the elastic component (21) is pressed to drive the dust-proof plate (22) to move towards the cap bottom (12) of the pen cap body (1) and turn over;

After the dust-proof plate (22) is turned over, the dust-proof plate (22) presses the air in the pen cap body (1) by moving to generate an air flow 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 cover body (1), and the dust-proof plate (22) is arranged on the mounting frame (212);

One end of the spring (211) is connected with the cover bottom (12), the other end of the spring is propped against the mounting frame (212), and the spring (211) enables the dust-proof plate (22) to move to the cover opening (11) of the pen cover body (1) by pushing the mounting frame (212);

The dust-proof plate (22) is coaxially arranged at the inner hole of the mounting frame (212), and the side wall is provided with a pair of guide posts (222), wherein

A pair of guide grooves (14) are formed in the inner wall of the pen cap body (1) along the axial direction;

the guide posts (222) penetrate through the mounting frame (212) and extend into the corresponding guide grooves (14);

the middle part of the guide post (222) is sleeved with a gear (223), and the inner wall of the guide groove (14) is provided with a rack (15), wherein

The rack (15) is positioned at the cover opening (11) of the pen cover body (1) and is matched with the gear (223);

The dust-proof plate (22) moves toward the mouth (11) and turns over at the mouth (11) so that the plane (221) faces outward, and

The dust guard (22) moves towards the lid base (12) and is turned over at the mouth (11) so that the plane (221) faces inwards.

2. The self-cleaning pen cap according to claim 1, wherein,

The guide groove (14) comprises an outer layer groove (141) and an inner layer groove (142), wherein

The width of the outer layer groove (141) is larger than the width of the inner layer groove (142);

the rack (15) is arranged on the inner wall of the outer layer groove (141);

The inner layer groove (142) is matched with the end part of the guide post (222), and an avoidance area (143) is arranged at the rack (15).

3. The self-cleaning pen cap according to claim 1, wherein,

A stress ring (213) is arranged on one side of the mounting frame (212) facing the cover opening (11);

the height of the stress ring (213) is larger than the radius of the dust-proof plate (22);

when the pen container (3) is inserted into the pen cap body (1), the pen container is propped against the stress ring (213) to push the mounting frame (212) to move.

4. The self-cleaning pen cap according to claim 1, wherein,

One side of the dust-proof plate (22) is the plane (221), and the other side is the cambered surface (224);

When the pen container (3) is inserted into the pen cap body (1), the dustproof plate (22) enables the cambered surface (224) to be close to the nozzle (31) of the pen container (3) through turnover so as to prevent dust.

5. A self-cleaning pen cap according to claim 2, wherein,

The inner wall of the inner layer groove (142) at the cover bottom (12) is provided with a bulge (144);

When the dust-proof plate (22) is turned over and moved to the cover bottom (12), the guide post (222) vibrates the dust-proof plate (22) by being matched with the protrusion (144).

6. A pen-type injector, which comprises a pen body, characterized by comprising the following steps:

a self-cleaning pen cap according to any one of claims 1-5, and

A pen container (3) for inserting a pen cap body (1), wherein

When the pen container (3) is clamped with the pen cover body (1), the pen container (3) is pushed against by the stress ring (213) to prevent shaking.

7. A method of operating a pen injector as claimed in claim 6, comprising:

The dustproof plate (22) is driven to move to the cover opening (11) of the pen cover body (1) through the elastic component (21), so that the plane (221) of the dustproof plate (22) faces outwards to prevent dust;

The pen container (3) is inserted into the pen cover body (1), the elastic component (21) drives the dustproof plate (22) to move towards the cover bottom (12) of the pen cover body (1) and turn over, and meanwhile, the dustproof plate (22) is turned over to enable the cambered surface (224) to be attached to the nozzle (31) of the pen container (3) for dust prevention;

Air in the pen cap body (1) is pressed by moving the dust-proof plate (22) toward the cap bottom (12) to blow out dust from the dust-discharging hole (13) of the cap bottom (12).