A ballpoint pen marker

Abstract

The present invention discloses a ballpoint pen marker, comprising a pen barrel structure, including a pen body, a button and a refill assembly, the refill assembly including a push rod, the end of the push rod being provided with a pen head; a sealed adjustment mechanism including a limiting sleeve, a sealing rubber part and a fixing sleeve; the limiting sleeve is sleeved on the push rod and a first thread matching structure is provided therebetween; the sealing rubber part is sleeved on the limiting sleeve and the two are circumferentially fixed, the fixing sleeve is sleeved on the sealing rubber part and a second thread matching structure is provided therebetween; the first thread matching structure and the second thread matching structure are configured to drive the sealing rubber part to move upward along the axial direction of the pen body when the push rod is extended toward the bottom of the pen body; a mold flap assembly is provided at the end of the sealing rubber part, the mold flap assembly including a plurality of arc-shaped petals that can be opened and closed; the inner wall of the bottom end of the pen body is provided with a contraction cone surface, and in the contracted state, the mold flap assembly cooperates with the contraction cone surface to close the arc-shaped petals to form a sealed closed surface.

Description

Technical Field

[0001] The present invention relates to the field of pens, in particular to a ballpoint pen type marker. Background Art

[0002] A marker, or whiteboard marker, is a pen with an ink core. These pens are widely used in transportation and office environments. For example, in cultural and writing supplies, markers are used to mark various packaging materials, glass, ceramics, metal products, and wood. Whiteboard pens, on the other hand, are widely used in teaching and office settings for writing on whiteboards. Because they are water-resistant and colorfast, they are primarily used for writing, marking, and labeling.

[0003] These pens generally consist of a detachable pen body and cap. When needed, the cap is removed and replaced after use. However, since the cap is detachable, users often forget to replace it after use, making it easy to lose the cap and exposing the pen tip to the air. Furthermore, the inner core of these markers contains alcohol. Prolonged exposure to air can cause the solvent in the ink to evaporate and dry out, significantly shortening the pen's lifespan and leading to significant waste.

[0004] A ballpoint pen doesn't require a cap, making it easy to use without having to worry about the cap falling off. This led to the idea of ​​applying this structure to a marker pen. While the tip of a ballpoint pen is retractable, it's still exposed to air when retracted, making it unsuitable for use with markers like those described above. Therefore, a marker pen with a ballpoint pen structure is designed, one that can create a sealed environment around the tip when retracted, preventing it from being exposed to air. Summary of the Invention

[0005] The present invention overcomes the shortcomings of the prior art and provides a ballpoint pen-style marker. The marker adopts a ballpoint pen structure, making it much more convenient to use than existing markers with detachable caps. Furthermore, a sealing adjustment mechanism is provided, so that when the pen tip retracts, the molded parts of the sealing rubber component automatically close to form a sealed surface, preventing the pen tip from contacting air and causing volatilization. When the pen tip extends, the molded parts open accordingly, without affecting the extension of the pen tip. The user simply uses the control method of a conventional ballpoint pen, making the structural design very ingenious.

[0006] The technical solution of the present invention is achieved as follows:

[0007] A ballpoint pen marker, comprising:

[0008] The pen holder structure includes a pen body, a button, and a refill assembly retractably arranged in the pen body. The refill assembly includes a push rod at the bottom, and a pen tip is provided at the end of the push rod. By pressing the button, the pen tip can be in a use state where it extends out of the pen body or in a retracted state where it retracts into the pen body.

[0009] A sealing adjustment mechanism is provided between the bottom of the pen body and the push rod; from the inside to the outside, the sealing adjustment mechanism includes a limiting sleeve, a sealing rubber member and a fixed sleeve that are sequentially sleeved and matched; the limiting sleeve is sleeved on the push rod and a first threaded matching structure is provided between the two; the sealing rubber member is sleeved on the limiting sleeve and the two are circumferentially fixed, and the sealing rubber member can also slide along the axial direction of the limiting sleeve; the fixed sleeve is connected to the bottom of the pen body, and the fixed sleeve is sleeved on the sealing rubber member and a second threaded matching structure is provided between the two; when the pen tip is in the retracted state, the sealing rubber member is configured to be located at the bottom end of the pen body, and the first threaded matching structure and the second threaded matching structure are configured to drive the sealing rubber member to move upward along the axial direction of the pen body when the push rod extends toward the bottom of the pen body;

[0010] The end of the sealing rubber part is provided with a mold flap assembly, which includes a number of arc-shaped petals that can be opened and closed; the inner wall of the bottom end of the pen body has a contraction cone surface, and in the contracted state, the mold flap assembly cooperates with the contraction cone surface to close the arc-shaped petals to form a sealed closed surface; in the use state, the sealing rubber part moves upward relative to the pen body while the pen tip is extended, and the mold flap assembly can open to allow the pen tip to pass through.

[0011] Preferably, the sealing rubber part includes a flexible rubber opening and closing body and a hard matching ring body connected to the upper end of the rubber opening and closing body; the mold half assembly is arranged at the end of the rubber opening and closing body; the matching ring body is circumferentially fixed to the limiting sleeve; and the second threaded matching structure is arranged between the matching ring body and the fixed sleeve.

[0012] Preferably, the sealing rubber component is made of soft rubber material, and the matching ring body is made of hard plastic material.

[0013] Preferably, in use, the arcuate petals are in an open state. Then, when the pen tip extends, that is, when the mold half assembly is separated from the contraction cone, the arcuate petals can automatically open to allow the pen tip to pass through without interfering with the pen tip.

[0014] Preferably, the pen body has a constricted nib at its bottom end; the diameter of the nib gradually decreases from top to bottom; the constricted conical surface is formed on the inner wall of the nib; in the constricted state, the constricted conical surface mates with the mold halves above and below. The nib is a feature of every ballpoint pen, and the present invention fully utilizes the constricted conical surface to cooperate with the mold halves to seal the mold halves; this design is highly ingenious and reasonable.

[0015] Preferably, in the use state, the mold half assembly is upwardly separated from the contraction cone, and the diameter of the fixing sleeve is larger than the maximum diameter of the mold half assembly when it is sealed, so that there is space for the mold half assembly to open.

[0016] Preferably, the mold half assembly includes three arc-shaped petals.

[0017] Preferably, a limiting guide mechanism is provided between the mating ring and the limiting sleeve. The limiting guide mechanism comprises a guide groove provided axially on the limiting sleeve and a corresponding guide protrusion provided on the inner wall of the mating ring and embedded in the guide groove. The guide protrusion is embedded in the guide groove, so that the mating ring is circumferentially fixed to the limiting sleeve. Subsequently, when the limiting sleeve rotates relative to the push rod, the mating ring is driven to rotate simultaneously, and the mating ring can also slide smoothly axially relative to the limiting sleeve.

[0018] Preferably, the first thread matching structure includes a first external thread provided on the outer surface of the push rod and a first internal thread correspondingly provided in the limiting sleeve, so that the matching between the limiting sleeve and the push rod is similar to a screw rod and nut structure.

[0019] Preferably, a circle of inwardly protruding limiting bosses is provided on the upper portion of the fixed sleeve, and a circle of outwardly protruding upper convex ring is correspondingly provided on the upper end of the limiting sleeve; the push rod extends toward the bottom end of the pen body so that the limiting bosses and the upper convex ring abut each other; the limiting bosses brake the limiting sleeve so that the limiting sleeve rotates relative to the push rod. The cooperation between the limiting sleeve and the push rod is similar to the principle of a screw nut, and a constant maximum static friction force exists between the limiting sleeve and the push rod. When the limiting sleeve itself is subjected to an external braking force greater than the maximum static friction force, the push rod telescopes in the axial direction, and the limiting sleeve rotates; therefore, the provision of the limiting bosses can limit and brake the limiting sleeve, allowing the limiting sleeve to rotate and drive the sealing rubber part to rotate synchronously.

[0020] Preferably, the refill assembly is provided with an outwardly protruding spring retaining ring, and a brake spring is disposed between the spring retaining ring and the upper protruding ring. During use, the brake spring is compressed to apply a compressive force to the stop sleeve. Subsequently, when the pen tip is returned from the use state to the retracted state, the compressive force of the brake spring again brakes the stop sleeve, allowing it to rotate in the opposite direction relative to the push rod and return to its original position.

[0021] Preferably, the fixed sleeve is relatively fixed to the pen body; the second threaded engagement structure includes a second external thread disposed outside the engagement ring and a corresponding second internal thread disposed within the fixed sleeve. The fixed sleeve is relatively fixed to the pen body, and rotation of the sealing rubber member will tend to move along the axial direction of the pen body.

[0022] The design starting point, concept and beneficial effects of the present invention using the above technical solution are:

[0023] First, the ballpoint pen-type marker of the present invention adopts a ballpoint pen structure, and its operation method is no different from that of a conventional ballpoint pen. Compared with the existing markers with detachable pen caps, it is undoubtedly more convenient to use. The key points are: a sealed adjustment mechanism is provided so that the sealing rubber part can move axially in accordance with the extension or contraction of the pen tip. When the pen tip contracts, the mold flap assembly of the sealing rubber part can automatically close to form a closed surface, preventing the pen tip from contacting the air and causing volatilization, thereby extending the service life. When the pen tip is extended, the mold flap assembly can also open accordingly without affecting the extension movement of the pen tip. The deformation movement of the sealing rubber part is spontaneous, and the user only needs to use it in the same way as a common ballpoint pen, making the structural design very clever.

[0024] Secondly, the mold-piece assembly includes three curved petals. The bottom end of the pen body has a nib, the inner wall of which has a conical contraction surface. When the pen tip is in the contracted state, the sealing rubber member is configured to fit precisely at the nib, and the mold-piece assembly and the conical contraction surface mate, closing the curved petals. This allows the sealing rubber member to seal the pen tip and prevent it from coming into contact with air. Since the nib is a common feature of every ballpoint pen, the present invention fully utilizes its conical contraction surface to cooperate with the mold-piece assembly to seal the mold-piece assembly. This design is very ingenious and reasonable.

[0025] Furthermore, by providing the first thread matching structure and the second thread matching structure for transmission guidance, when the push rod undergoes telescopic movement, the sealing rubber component can be driven to move along the axial direction of the pen body at the same time, and the transmission is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the three-dimensional structure of a marking pen in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the marker pen in an embodiment of the present invention;

[0028] Figure 3 is a cross-sectional view of the marking pen in the embodiment of the present invention in a retracted state;

[0029] Figure 4 A cross-sectional view of the marking pen in the embodiment of the present invention when in use;

[0030] Figure 5 is a cross-sectional structural diagram of the sealing adjustment mechanism in an embodiment of the present invention;

[0031] Figure 6Schematic diagram of the three-dimensional structure of the sealing rubber member and the limiting sleeve in the embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the three-dimensional structure of the sealing rubber member when it is closed in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the three-dimensional structure of the sealing rubber member when it is opened in an embodiment of the present invention;

[0034] Figure 9 This is a structural breakdown diagram of the marker pen in an embodiment of the present invention from another angle.

[0035] The figures are marked as follows: pen body 1; pen tip 1a; button 2; refill assembly 3; spring retaining ring 3a; push rod 4; pen tip 5; limiting sleeve 6; upper raised ring 6a; sealing rubber part 7; rubber opening and closing body 701; matching ring body 702; fixing sleeve 8; limiting boss 8a; first external thread 9a; first internal thread 9b; guide groove 10; guide protrusion 11; second external thread 12a; second internal thread 12b; mold flap assembly 13; arc-shaped petal 13a; closing surface 1301; contraction cone 14; brake spring 15. DETAILED DESCRIPTION

[0036] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0038] In the description of the present invention, the term "at least one" refers to one or more than one, unless otherwise clearly defined. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] The specific implementation of the present invention is as follows:

[0040] like Figure 1-9As shown, the present invention provides a ballpoint pen-type marker, comprising a barrel structure comprising a pen body 1, a button 2 located at the top of the pen body 1, and a refill assembly 3 retractably disposed within the pen body 1. The refill assembly 3 includes a push rod 4 located at the bottom, with a nib 5 disposed at its end. The barrel structure is a common ballpoint pen structure, whereby pressing the button 2 allows the nib 5 to be positioned between an in-use state, extending outward from the pen body 1, and a retracted state, retracted within the pen body 1. The pen also includes a sealing adjustment mechanism disposed between the bottom end of the pen body 1 and the push rod 4. From the inside out, the sealing adjustment mechanism comprises a limiting sleeve 6, a sealing rubber member 7, and a fixing sleeve 8, which are sequentially sleeved and mated. This sealing adjustment mechanism allows the sealing rubber member 7 to seal the bottom end of the pen body 1 when the nib 5 is retracted, preventing it from being exposed to air. Since the inner core of a marker is ink, prolonged exposure of the nib 5 to air can easily cause it to evaporate, drying out the nib and shortening its service life. Therefore, the marker pen of the present invention adopts a ballpoint pen structure, which is convenient to use and can also form a seal for the pen head 5 in the retracted state. The design considerations are sufficient and thoughtful.

[0041] like Figure 2-8 As shown, the specific matching structure of the sealed adjustment mechanism is: the limiting sleeve 6 is sleeved on the push rod 4, and a first thread matching structure is provided between the limiting sleeve 6 and the push rod 4. The first thread matching structure includes a first external thread 9a provided on the outer surface of the push rod 4 and a first internal thread 9b correspondingly provided in the limiting sleeve 6, that is, the limiting sleeve 6 is threadedly connected to the push rod 4. When the push rod 4 performs telescopic movement along the axial direction of the pen body 1 and the limiting sleeve 6 is subjected to a braking force, the limiting sleeve 6 will rotate relative to the push rod 4.

[0042] like Figure 6-8 As shown, the sealing rubber member 7 is further sleeved on the limiting sleeve 6. The sealing rubber member 7 includes a rubber opening and closing body 701 made of soft rubber material and a hard matching ring body 702 connected to the rear end of the rubber opening and closing body 701. The matching ring body 702 is made of plastic material; and the matching ring body 702 is circumferentially fixed to the limiting sleeve 6, as shown in FIG. Figure 6 As shown, a limiting guide mechanism is provided between the mating ring body 702 and the limiting sleeve 6, and the limiting guide mechanism includes a guide groove 10 arranged on the limiting sleeve 6 along the axial direction and a guide protrusion 11 correspondingly arranged on the inner wall of the mating ring body 702 and embedded in the guide groove 10; the guide protrusion 11 is embedded in the guide groove 10, so that the mating ring body 702 will be fixed circumferentially with the limiting sleeve 6, and then when the limiting sleeve 6 rotates relative to the push rod 4, it will drive the mating ring body 702 to rotate at the same time; and the guiding effect of the guide protrusion 11 and the guide groove 10 enables the mating ring body 702 to slide smoothly in the axial direction relative to the limiting sleeve 6.

[0043] The fixing sleeve 8 is further sleeved with the sealing rubber member 7, and a second threaded fitting structure is provided between the fixing sleeve 8 and the matching ring body 7. The second threaded fitting structure includes a second external thread 12a provided on the outside of the matching ring body 7 and a second internal thread 12b correspondingly provided inside the fixing sleeve 8; thereby, the sealing rubber 7 is also fitted and connected with the fixing sleeve 8. In addition, as Figure 9 As shown, the fixed sleeve 8 is fixedly arranged at the bottom of the pen body 1 , that is, the fixed sleeve 8 and the pen body 1 remain relatively fixed.

[0044] Specifically, the cooperation between the limiting sleeve 6 and the push rod 4 is similar to the principle of a screw nut. There is a constant maximum static friction between the limiting sleeve 6 and the push rod 4. When the limiting sleeve 6 itself is subjected to an external braking force greater than the maximum static friction, if the push rod 4 moves in an axial direction, the limiting sleeve 6 will rotate relative to the push rod 4. Figure 2-5 As shown, the upper portion of the fixed sleeve 8 is provided with a circle of inwardly protruding limiting bosses 8a, and correspondingly, the upper end of the limiting sleeve 6 is provided with a circle of outwardly protruding upper convex rings 6a. This design is intended to prevent the movement of the limiting sleeve 6 when the push rod 4 extends toward the bottom end of the pen body 1, by causing the limiting bosses 8a to abut against the upper convex rings 6a. This allows the limiting bosses 8a to brake the limiting sleeve 6, causing it to rotate relative to the push rod 4. The refill assembly 3 is also provided with a circle of outwardly protruding spring retaining rings 3a. A brake spring 15 is interposed between the spring retaining rings 3a and the upper convex rings 6a. In use, the brake spring 15 is compressed to compress the limiting sleeve 6. Subsequently, when the pen tip 5 is returned from the use state to the retracted state, the compressive force of the brake spring 15 again brakes the limiting sleeve 6, allowing the limiting sleeve 6 to rotate relative to the push rod 4 and return to its original position.

[0045] Because the mating ring 7 and the limiting sleeve 6 are circumferentially fixed, the extension and retraction of the push rod 4 along the axial direction of the pen body 1 can drive the limiting sleeve 6 to synchronously rotate the sealing rubber member 7. Furthermore, because the sealing rubber member 7 is threadedly engaged with the fixed sleeve 8, as the sealing rubber member 7 rotates, under the action of the fixed sleeve 8, the sealing rubber member 7 also tends to move along the axial direction of the pen body. Furthermore, under the action of the guide protrusions 11 and guide grooves 10, the sealing rubber member 7 simultaneously slides relative to the limiting sleeve 6. Ultimately, it can be concluded that the extension and retraction of the push rod 4 can simultaneously drive the sealing rubber member 7 to move along the axial direction of the pen body 1.

[0046] Specifically: Figure 1-4As shown, the first thread matching structure and the second thread matching structure are configured such that when the push rod 4 extends toward the bottom of the pen body 1, the sealing rubber member 7 is driven to move upward toward the pen body 1; when the push rod 4 retracts upward relative to the pen body 1, the sealing rubber member 1 moves downward toward the bottom of the pen body 1. That is, the movement direction of the sealing rubber member 1 is opposite to that of the push rod 4. Figure 3-4 As shown, when the pen tip moves from the retracted state to the use state, the sealing rubber part 1 moves upward from the bottom of the pen body.

[0047] Further: If Figure 3-8 As shown, the end of the rubber opening and closing body 701 is provided with a mold flap assembly 13, and the mold flap assembly 13 includes a plurality of arc-shaped flaps 13a that can be opened and closed. In the present invention, the number of the arc-shaped flaps 13a is specifically set to 3; Figure 7 As shown, the arc-shaped petals 13a can be closed to form a sealed closing surface 1301; Figure 8 As shown, the arc-shaped petals 13a can also be opened; and in the free state, the arc-shaped petals 13a are in an open state.

[0048] The pen body 1 has a constricted nib 1a at the bottom. From top to bottom, the inner wall of the nib 1a has a constricted conical surface 25 with a gradually decreasing diameter. The constricted conical surface 25 can cooperate with the mold flap assembly 13, specifically: Figure 1 、 3 As shown, when the pen tip 5 is in the retracted state, the sealing rubber member 7 is configured to be located exactly at the pen mouth 1a, and the retracted cone 25 acts on the arc-shaped petals 13a to close, so that the sealing rubber member 7 can now seal the pen tip 5 and prevent the pen tip 5 from contacting the air. Figure 4 As shown, when in use, the pen tip 5 is controlled to extend, and at this time, the sealing rubber member 7 will move upward to exit the pen mouth 1a, so that the mold flap assembly 13 will be separated from the contraction cone 14; and the diameter of the fixed sleeve 8 is configured to be larger than the maximum diameter of the sealing rubber member 7 when sealed; then at this time, the arc-shaped petals 13a will automatically open, and because the arc-shaped petals 13a themselves are made of soft rubber material, they are easily deformed. Then, when the pen tip 5 is extended downward, it can directly pass through to avoid the rubber member 7, thereby allowing the pen tip 5 to extend outside the pen body 1. The pen mouth 1a is a structure that every ballpoint pen has, so the present invention fully utilizes its contraction cone 14 to cooperate with the mold flap assembly 13, thereby being able to close the mold flap assembly 13; the design is very clever and reasonable.

[0049] In summary, the ballpoint pen marker of the present invention adopts a ballpoint pen structure, and its operation method is no different from that of a conventional ballpoint pen; compared with the existing markers with detachable pen caps, it is undoubtedly more convenient to use. The key points are: a sealed adjustment mechanism is additionally provided so that the sealing rubber part 7 can move axially in accordance with the extension or contraction of the pen tip 5, so that when the pen tip 5 contracts, the mold flap assembly 13 of the sealing rubber part 7 can automatically close to form a closed surface 1301, preventing the pen tip 5 from contacting the air and causing volatilization. When the pen tip 5 is extended, the mold flap assembly 13 can also open accordingly, without affecting the extension movement of the pen tip 5; and the deformation movement of the sealing rubber part 7 is spontaneous, and the user only needs to use it in the same control method as a common ballpoint pen, making the structural design very clever.

[0050] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A ballpoint pen marker, characterized in that include: The pen holder structure includes a pen body, a button, and a refill assembly retractably arranged in the pen body. The refill assembly includes a push rod at the bottom, and a pen tip is provided at the end of the push rod. By pressing the button, the pen tip can be in a use state where it extends out of the pen body or in a retracted state where it retracts into the pen body. A sealing adjustment mechanism is provided between the bottom of the pen body and the push rod; from the inside to the outside, the sealing adjustment mechanism includes a limiting sleeve, a sealing rubber member and a fixed sleeve that are sequentially sleeved and matched; the limiting sleeve is sleeved on the push rod and a first threaded matching structure is provided between the two; the sealing rubber member is sleeved on the limiting sleeve and the two are circumferentially fixed, and the sealing rubber member can also slide along the axial direction of the limiting sleeve; the fixed sleeve is connected to the bottom of the pen body, and the fixed sleeve is sleeved on the sealing rubber member and a second threaded matching structure is provided between the two; when the pen tip is in the retracted state, the sealing rubber member is configured to be located at the bottom end of the pen body, and the first threaded matching structure and the second threaded matching structure are configured to drive the sealing rubber member to move upward along the axial direction of the pen body when the push rod extends toward the bottom of the pen body; The end of the sealing rubber member is provided with a mold flap assembly, which includes a plurality of arc-shaped petals that can be opened and closed; the inner wall of the bottom end of the pen body has a contraction cone surface. In the contracted state, the mold flap assembly cooperates with the contraction cone surface to close the arc-shaped petals to form a sealed closed surface; in the use state, the sealing rubber member moves upward relative to the pen body while the pen tip is extended, and the mold flap assembly can open to allow the pen tip to pass through; The sealing rubber component includes a flexible rubber opening and closing body and a hard matching ring body connected to the upper end of the rubber opening and closing body; the mold half assembly is arranged at the end of the rubber opening and closing body; the matching ring body is circumferentially fixed to the limiting sleeve; and the second thread matching structure is arranged between the matching ring body and the fixing sleeve; A limit guide mechanism is provided between the mating ring body and the limit sleeve, which includes a guide groove arranged on the limit sleeve along the axial direction and a guide protrusion correspondingly arranged on the inner wall of the mating ring body and embedded in the guide groove; the first threaded mating structure includes a first external thread arranged on the outer surface of the push rod and a first internal thread correspondingly arranged in the limit sleeve; a circle of inwardly protruding limit bosses is provided on the upper part of the fixed sleeve, and a circle of outwardly protruding upper convex ring is correspondingly provided at the upper end of the limit sleeve; the push rod extends toward the bottom end of the pen body so that the limit boss and the upper convex ring abut each other up and down; the limit boss brakes the limit sleeve so that the limit sleeve rotates relative to the push rod; the fixed sleeve and the pen body remain relatively fixed; the second threaded mating structure includes a second external thread arranged on the mating ring body and a second internal thread correspondingly arranged in the fixed sleeve.

2. The ballpoint pen marker according to claim 1, wherein: The sealing rubber part is made of soft rubber material, and the matching ring body is made of hard plastic material.

3. The ballpoint pen marker according to claim 1, wherein: In use, the arc-shaped petals are in an open state.

4. The ballpoint pen marker according to claim 1, wherein: The pen body has a constricted nib at the bottom end; the diameter of the nib gradually decreases from top to bottom; the constricted conical surface is formed on the inner wall of the nib; In the contracted state, the contraction cone fits the mold half assembly up and down.

5. The ballpoint pen marker according to claim 1 or 4, characterized in that: In the use state, the mold half assembly is separated from the contraction cone surface upward; and the diameter of the fixed sleeve is larger than the maximum diameter of the mold half assembly when it is sealed.

6. The ballpoint pen marker according to claim 1, wherein: The mold half assembly includes three arc-shaped petals.

7. The ballpoint pen marker according to claim 1, wherein: A circle of spring clamping ring protruding outward is provided on the pen core assembly, and a brake spring is provided between the spring clamping ring and the upper convex ring; in the use state, the brake spring is in a compressed state to provide an extrusion elastic force to the limiting sleeve.

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