Cosmetic pencil capable of being retracted

Abstract

The utility model relates to the technical field of cosmetic pencils, in particular to a retractable cosmetic pencil, which comprises a pencil body, a pencil point, a knob and a pushing component, the pushing component comprises a connecting seat, a mounting seat and a screw, a limit tube connected with the mounting seat is arranged between the pencil body and the pencil point, a limit component I is arranged between the connecting seat and the mounting seat, and the limit component II is arranged between the connecting seat and the mounting seat. The bottom of the connecting base is connected with the rotary knob, the mounting base is in threaded connection with the pen body, the screw is in threaded connection with the connecting base, and a second limiting assembly is arranged between the screw and the mounting base. Therefore, during retreating, the rotary knob is rotated to drive the connecting base to rotate, at the moment, the connecting base, the mounting base and the screw rotate synchronously, and the mounting base moves downwards due to threaded connection so as to drive the limiting pipe to move downwards and drive the material body to move downwards. The limiting pipe is arranged on the material body, so that the material body is supported and limited in shape through the limiting pipe, the limiting pipe and the material body move downwards synchronously when the limiting pipe moves downwards, force is applied to the whole material body, and deformation of the material body cannot be caused.

Description

TECHNICAL FIELD

[0001] The utility model relates to cosmetic pencil technical field, especially backable cosmetic pencil. BACKGROUND

[0002] Cosmetic pencil is a kind of tool for making up, mainly used to draw fine lines and patterns on face or body, and will be classified according to different parts of human body, such as eyebrow pencil for eyebrow. Meanwhile, the eyebrow pencil is mainly composed of a cap and a pen body, a placing rod is rotatably arranged in the pen body, and a lead is arranged at the top of the placing rod, and the lead is only connected with the placing rod at the bottom, so a long section of the lead moves up and down in the pen body, and then the placing rod is driven to rotate and extend or retract by the thread connection between the pen body and the placing rod, so as to drive the lead to extend or retract.

[0003] However, the material of the lead has hardness difference, and the conventional structure is not a problem for hard material. However, the conventional structure is not suitable for soft material. First, in the conventional structure, the lead has a long section without support, so the soft material will deform without support, and the shape of the lead after extension is also not good, so the eyebrow drawing effect is not good. Secondly, if the conventional structure is used, it can only extend, but cannot retract, because the conventional retraction only provides a downward pulling force to the bottom of the lead, that is, only one end is stressed, or only a small part is stressed, and the other part is not stressed and has no support, so the lead will deform or even tear. SUMMARY

[0004] The utility model aims at providing backable cosmetic pencil, by setting the material in the limiting tube, so that the limiting tube supports and limits the shape of the material, and the material is not deformed, and when moving down, the limiting tube is driven to move down to drive the material to move down, that is, the limiting tube and the material move down synchronously, at this time, since the material is mostly built-in in the limiting tube and only a small part is exposed, if force is applied to the material, it is the whole force applied to the material instead of partial force, so the material will not deform, and the problem that the existing structure is not suitable for soft material is solved.

[0005] The utility model is realized as follows:

[0006] The backable cosmetic pencil comprises a pen body, one end of the pen body is provided with a pen head, the other end of the pen body is provided with a knob, a material and a pushing assembly for driving the material to ascend and descend are arranged between the pen head and the knob, and the pushing assembly comprises a driving rod and a connecting rod.

[0007] The pushing assembly comprises a connecting seat, a mounting seat and a screw rod between the connecting seat and the mounting seat, and a limiting tube is arranged between the material body and the pen head, and the bottom of the limiting tube is connected with the mounting seat, a limiting assembly one for releasing synchronous rotation is arranged between the connecting seat and the mounting seat, the bottom of the connecting seat is connected with the knob, the mounting seat is threadedly connected with the pen body, the screw rod is in contact with the bottom of the material body and is threadedly connected with the connecting seat, and a limiting assembly two for limiting rotation of the screw rod is arranged between the screw rod and the mounting seat;

[0008] The knob is rotated to drive the connecting seat to rotate, at this time, the connecting seat, the mounting seat and the screw rod rotate synchronously, the mounting seat moves upward due to the threaded connection, when the mounting seat abuts against the pen head, the connecting seat and the mounting seat are relatively rotated due to the limiting assembly one, and the screw rod does not rotate due to the limiting assembly two and moves upward with the connecting seat to push the material body to move upward in the limiting tube;

[0009] And the knob is rotated to another direction to drive the connecting seat to rotate, at this time, the connecting seat, the mounting seat and the screw rod rotate synchronously, the mounting seat moves downward due to the threaded connection to drive the limiting tube to move downward and the material body to move downward.

[0010] Preferably, the limiting assembly one comprises an elastic sheet arranged on the mounting seat, and a plurality of protrusions are arranged on the inner wall of the connecting seat, one side of the protrusion is a slope, and the other side of the protrusion is a pushing surface;

[0011] When the elastic sheet is in contact with the pushing surface, the connecting seat and the mounting seat rotate synchronously, and when the elastic sheet is in contact with the slope, the elastic sheet can jump over the protrusion to make the connecting seat and the mounting seat relatively rotate.

[0012] Preferably, a side opening is formed in the side wall of the mounting seat, and an elastic sheet is arranged on the inner wall of the side opening;

[0013] Or / and, two elastic sheets are symmetrically arranged on the mounting seat;

[0014] Or / and, a protruding portion four is arranged on the outer side of the mounting seat, and a connecting groove three is formed in the inner wall of the connecting seat corresponding to the protruding portion four.

[0015] Preferably, the limiting assembly two comprises two planes one symmetrically arranged in the mounting seat, and two planes two are formed on the two sides of the screw rod, when the plane one is parallel to the plane two, the screw rod can rotate and is not movable, and when the plane one is perpendicular to the plane two, the screw rod is not rotatable and is movable.

[0016] Preferably, a helical groove one is formed on the outer side of the mounting seat, and two screw threads one are arranged on the inner wall of the pen body and engaged with the helical groove one;

[0017] Or / and, the screw outside is formed with a spiral groove two, and the inner wall of the connecting seat is provided with two screw threads two, and the screw thread two is engaged with the spiral groove two.

[0018] Preferably, the connecting seat comprises a main body and an inner part, and the two ends of the main body are connected with the mounting seat and the knob respectively, and the inner part is located inside the main body, and the inner part is threadedly connected with the screw.

[0019] Preferably, the inner wall of the pen head is provided with at least one protruding part, and the top of the mounting seat is located in the pen head and abuts against the bottom of the protruding part.

[0020] Preferably, the top of the screw is provided with a plug-in part one, and the plug-in part one is inserted into the bottom of the material body so as to connect the screw and the material body.

[0021] Or / and, the top of the screw is provided with a plug-in part two, and the plug-in part two is inserted into the bottom of the material body so as to connect the plug and the material body.

[0022] Preferably, the connecting seat comprises an upper part and a lower part, and the bottom surface of the upper part can abut against the top of the knob so as to limit the downward movement of the connecting seat, and at least one convex strip one is arranged on the outer side of the lower part, and at least two convex strips two are arranged on the inner wall of the knob, and the convex strip one is located between the two convex strips two.

[0023] Or / and, the pen body is arranged on the outer side of the top of the knob, and the outer side of the knob is provided with a protruding part one, and the inner wall of the pen body is provided with a connecting groove one corresponding to the protruding part one.

[0024] Preferably, the bottom of the pen head is located in the pen body, and a sealing ring one is arranged between the inner wall of the pen body and the bottom of the pen head, the outer side of the bottom of the pen head is provided with a protruding part two, and the inner wall of the pen body is provided with a connecting groove two corresponding to the protruding part two.

[0025] Or / and, the top of the pen head is provided with a cover, and a sealing ring two is arranged between the inner wall of the cover and the pen head, the outer side of the pen head is provided with a protruding part three, and the inner wall of the cover is provided with at least one convex block, and the top of the convex block abuts against the bottom of the protruding part three.

[0026] The utility model discloses compared with prior art has the beneficial technical effect of highlighting:

[0027] The utility model discloses through setting up the material body in the limiting pipe to make the limiting pipe support and limit the shape of the material body to make the material body not deform, and when moving down, drive the limiting pipe to move down to drive the material body to move down, the limiting pipe and the material body are synchronous, and when this, because the material body is mostly built -in in the limiting pipe and only a small part exposes, if force is applied to the material body, the whole material body is forced, not partial force, so the material body does not deform. DRAWINGS

[0028] Figure 1 It is a structure schematic view of the utility model.

[0029] Figure 2 It is a structure schematic view of the utility model.

[0030] Figure 3 It is a structure schematic view of the utility model.

[0031] Figure 4 It is a structure schematic view of the utility model.

[0032] Figure 5 It is a structure schematic view of the utility model.

[0033] Figure 6 It is a structure schematic view of the utility model. Figure 5 It is a structure schematic view of the utility model.

[0034] Figure 7 It is a structure schematic view of the utility model.

[0035] Figure 8 It is a structure schematic view of the utility model.

[0036] Figure 9 It is a structure schematic view of the utility model.

[0037] Figure 10 It is a structure schematic view of the utility model.

[0038] Figure 11 It is a structure schematic view of the utility model.

[0039] Reference Signs: 1-pen body;11-connection groove one;12-threads one;13-connection groove two;2-pen head;

[0040] 21-protruding part two;22-protruding part three;23-protruding part;3-rotary knob;31-convex strip two;

[0041] 32-protruding part one;4-material body;5-connection seat;51-protruding part;511-inclined surface;512-push surface;

[0042] 52-connection groove three;53-threads two;54-upper part;55-lower part;551-convex strip one;56-main body;

[0043] 561-clamping groove;57-internal component;571-clamping block;6-mounting seat;61-spring sheet;62-side opening;

[0044] 63-protruding part four;64-flat surface one;65-spiral groove one;7-screw;71-flat surface two;

[0045] 73-Spiral groove two; 74-Plug one; 8-Limiting tube; 9-Plug; 91-Plug two; 20-Cap; 201-Protrusion. Detailed Implementation

[0046] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0047] like Figures 1-11 As shown, the retractable makeup brush includes a brush body 1, with a brush tip 2 at one end of the brush body 1 and a knob 3 at the other end of the brush body 1. A material 4 and a push component for driving the material 4 to rise and fall are arranged between the brush tip 2 and the knob 3.

[0048] The push assembly includes a connecting seat 5 and a mounting seat 6, as well as a screw 7 located between the connecting seat 5 and the mounting seat 6. A limiting tube 8 is provided between the material body 4 and the pen tip 2, and the bottom of the limiting tube 8 is connected to the mounting seat 6.

[0049] Therefore, in actual use, by placing the material 4 inside the limiting tube 8, the limiting tube 8 can support and limit the shape of the material 4, thus preventing the material 4 from deforming.

[0050] Furthermore, a limiting component 1 for releasing synchronous rotation is provided between the connecting seat 5 and the mounting seat 6, and the bottom of the connecting seat 5 is connected to the knob 3, and the mounting seat 6 is threadedly connected to the pen body 1. Secondly, the screw 7 contacts the bottom of the material body 4 and is threadedly connected to the connecting seat 5, and a limiting component 2 for restricting the rotation of the screw 7 is provided between the screw 7 and the mounting seat 6.

[0051] Therefore, in actual use, by turning the knob 3, the connecting seat 5 is driven to rotate. At this time, the connecting seat 5, the mounting seat 6 and the screw 7 rotate synchronously. The mounting seat 6 moves upward due to the threaded connection. When the mounting seat 6 abuts against the pen tip 2, the connecting seat 5 and the mounting seat 6 rotate relative to each other due to the limiting component one. The screw 7 does not rotate due to the limiting component two and moves upward with the connecting seat 5, thereby pushing the material 4 to rise in the limiting tube 8.

[0052] At the same time, by turning the knob 3 in another direction, the connecting seat 5 is driven to rotate. At this time, the connecting seat 5, the mounting seat 6 and the screw 7 rotate synchronously, and the mounting seat 6 moves down due to the threaded connection, which in turn drives the limiting tube 8 to move down, thereby driving the material body 4 to move down.

[0053] Therefore, this utility model moves the material body 4 downward by moving the limiting tube 8 downward, that is, the limiting tube 8 and the material body 4 move downward synchronously. At this time, since most of the material body 4 is built into the limiting tube 8 and only a small part is exposed, if force is applied to the material body 4, the force is applied to the entire material body 4 rather than a part, so it will not cause the material body 4 to deform.

[0054] And during the push and back-off, the screw rod 7 is always in contact with the material 4, so as not to pull the bottom of the material 4, thereby avoiding the deformation of the material 4.

[0055] And the abutment between the mounting seat 6 and the pen head 2 is that: first, the inner wall of the pen head 2 is provided with at least one protruding portion 23, and the top of the mounting seat 6 is located in the pen head 2 and abuts against the bottom of the protruding portion 23.

[0056] As shown in Figure 8 and Figure 9 , the structure of the limiting assembly one is that: first, the limiting assembly one includes the elastic sheet 61 provided on the mounting seat 6, and the inner wall of the connecting seat 5 is provided with a plurality of protrusions 51, and one side of the protrusion 51 is a slope 511, and the other side of the protrusion 51 is a pushing surface 512.

[0057] Therefore, in actual use, when the elastic sheet 61 is in contact with the pushing surface 512, the connecting seat 5 and the mounting seat 6 rotate synchronously at this time, and when the elastic sheet 61 is in contact with the slope 511, the elastic sheet 61 can be forced to jump over the protrusion 51 to make the connecting seat 5 and the mounting seat 6 relatively rotate.

[0058] At the same time, other details of the limiting assembly one are that: first, the side wall of the mounting seat 6 is provided with a side opening 62, and the inner wall of the side opening 62 is provided with an elastic sheet 61. Therefore, in actual use, the side opening 62 is provided to provide space for the elastic sheet 61.

[0059] And the mounting seat 6 is provided with two elastic sheets 61 symmetrically, so that the cooperation between the mounting seat 6 and the connecting seat 5 is more stable.

[0060] Secondly, the mounting seat 6 is provided with a protruding portion four 63 on the outside, and the inner wall of the connecting seat 5 is provided with a connecting groove three 52 corresponding to the protruding portion four 63. Therefore, in actual use, the protruding portion four 63 and the connecting groove three 52 are matched to realize the connection between the mounting seat 6 and the connecting seat 5 and avoid the separation of the two.

[0061] As shown in Figure 2 , Figure 3 and Figure 9 , the structure of the limiting assembly two is that: first, the limiting assembly two includes two planes one 64 provided symmetrically in the mounting seat 6, and the two sides of the screw rod 7 are formed with planes two 71.

[0062] Therefore, in actual use, when the plane one 64 is parallel to the plane two 71, the screw rod 7 can rotate and cannot move, and when the plane one 64 is perpendicular to the plane two 71, the screw rod 7 cannot rotate and can move.

[0063] As shown in Figures 3-7As shown, the structure of the threaded connection: first, the outer side of the mounting seat 6 is formed with a spiral groove 65, and the inner wall of the pen body 1 is provided with two screw threads 12, and the screw threads 12 are engaged with the spiral groove 65.

[0064] At the same time, the outer side of the screw rod 7 is formed with a spiral groove 73, and the inner wall of the connecting seat 5 is provided with two screw threads 53, and the screw threads 53 are engaged with the spiral groove 73.

[0065] Moreover, the connecting seat 5 and the screw thread can be integrally formed, or can be separate, when it is separate, the connecting seat 5 includes a main body 56 and an internal component 57, and the two ends of the main body 56 are connected with the mounting seat 6 and the knob 3 respectively, and the internal component 57 is located inside the main body 56, and the internal component 57 is in threaded connection with the screw rod 7.

[0066] The structure between the internal component 57 and the main body 56 is that: first, the bottom of the internal component 57 is provided with at least one clamping block 571, and the main body 56 is provided with a clamping groove 561 corresponding to the clamping block 571.

[0067] As shown in the figure, Figure 2 and Figure 3 The structure between the screw rod 7 and the material body 4 is various, which can be directly connected, that is, the top of the screw rod 7 is provided with an insertion part 74, and the insertion part 74 is inserted into the bottom of the material body 4 to connect the screw rod 7 and the material body 4.

[0068] Or the top of the screw rod 7 is provided with a plug 9, and the top of the plug 9 is provided with an insertion part 91, and the insertion part 91 is inserted into the bottom of the material body 4 to connect the plug 9 and the material body 4. The connection between the screw rod 7 and the plug 9 is that the insertion part 74 is located in the plug 9, and the connection is more compact through the setting of the plug 9.

[0069] As shown in the figure, Figures 2-11 The structure between each component is that: first, the structure between the connecting seat 5 and the knob 3 is that the connecting seat 5 includes an upper part 54 and a lower part 55, the bottom surface of the upper part 54 can abut against the top of the knob 3 to limit the downward movement of the connecting seat 5, and at least one convex strip 551 is provided on the outer side of the lower part 55, and at least two convex strips 31 are provided on the inner wall of the knob 3, and the convex strip 551 is located between the two convex strips 31.

[0070] Therefore, in actual use, the bottom surface of the upper part 54 can abut against the top of the knob 3 to limit the downward movement of the connecting seat 5, thereby limiting the range of the connecting seat 5. At the same time, the relative rotation between the connecting seat 5 and the knob 3 is limited through the matching of the convex strip 551 and the convex strip 31, that is, only synchronous rotation is allowed.

[0071] Moreover, the main body 56 corresponds to the above, that is, the main body 56 includes an upper part 54 and a lower part 55.

[0072] Meanwhile, the structure between the pen body 1 and the knob 3 is that the pen body 1 is sleeved on the top outer side of the knob 3, the knob 3 is provided with a protruding part one 32 on the outer side, and the inner wall of the pen body 1 is provided with a connecting groove one 11 corresponding to the protruding part one 32.

[0073] Therefore, in actual use, the pen body 1 and the knob 3 are connected through the matching of the protruding part one 32 and the connecting groove one 11, and the knob 3 is prevented from being separated from the pen body 1.

[0074] Secondly, the structure between the pen head 2 and the pen body 1 is that the pen head 2 is located in the pen body 1, the inner wall of the pen body 1 and the bottom of the pen head 2 are provided with a sealing ring one, the bottom outer side of the pen head 2 is provided with a protruding part two 21, and the inner wall of the pen body 1 is provided with a connecting groove two 13 corresponding to the protruding part two 21.

[0075] Therefore, in actual use, the pen head 2 and the pen body 1 are connected through the matching of the protruding part two 21 and the connecting groove two 13, and the pen head 2 is prevented from being separated from the pen body 1.

[0076] Furthermore, the top outer side of the pen head 2 is sleeved with a cover 20, the inner wall of the cover 20 and the pen head 2 are provided with a sealing ring two, the outer side of the pen head 2 is provided with a protruding part three 22, the inner wall of the cover 20 is provided with at least one protruding block 201, and the top of the protruding block 201 and the bottom of the protruding part three 22 are in abutment.

[0077] Therefore, in actual use, the pen head 2 and the cover 20 are connected through the matching of the protruding block 201 and the protruding part three 22, and the cover 20 is prevented from being separated from the pen head 2. However, when a larger force is applied, the cover 20 and the pen head 2 can be separated.

[0078] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Meanwhile, the utility model is not limited by the above-mentioned embodiments, so that various changes and improvements of the utility model can be made without departing from the principle and range of the utility model, and these changes and improvements all fall within the scope of the utility model.

Claims

1. A retractable cosmetic pencil, characterized in that, The utility model provides a pen body (1), and the pen body (1) one end is provided with pen head (2), and the pen body (1) other end is provided with knob (3), and pen head (2) and knob (3) between be provided with material body (4) and be used for driving material body (4) to lift push assembly; The utility model discloses a pen body (1), and the pen body (1) one end is provided with pen head (2), and the pen body (1) other end is provided with knob (3), and pen head (2) and knob (3) between be provided with material body (4) and be used for driving material body (4) to lift push assembly; By rotating knob (3) to drive connecting seat (5) to rotate, at this time, connecting seat (5), mounting seat (6) and screw rod (7) synchronous rotation, and mounting seat (6) due to threaded connection and move up, when mounting seat (6) and pen head (2) abut, due to the limiting assembly one and make connecting seat (5) and mounting seat (6) between relative rotation, and screw rod (7) due to the limiting assembly two and do not rotate and along with connecting seat (5) rotation to make screw rod (7) move up and push material body (4) to rise in the limiting tube (8) in; And by rotating knob (3) to drive connecting seat (5) to rotate to another direction, at this time, connecting seat (5), mounting seat (6) and screw rod (7) synchronous rotation, and mounting seat (6) due to threaded connection and move down to drive limiting tube (8) and drive material body (4) to move down.

2. The retraction cosmetic pencil according to claim 1, characterized in that: The limiting assembly one includes the elastic sheet (61) set up on mounting seat (6), and the inner wall of connecting seat (5) is provided with a plurality of protrusions (51), and the one side of protrusion (51) is inclined plane (511), and the other side of protrusion (51) is push surface (512); When elastic sheet (61) and push surface (512) contact, at this time, connecting seat (5) and mounting seat (6) synchronous rotation, and when elastic sheet (61) and inclined plane (511) contact, can force let elastic sheet (61) jump over protrusion (51) and make connecting seat (5) and mounting seat (6) between relative rotation.

3. The retraction cosmetic pencil according to claim 2, characterized in that: The side wall of mounting seat (6) is provided with side opening (62), and the inner wall of side opening (62) is provided with elastic sheet (61); Or / and, the mounting seat (6) is provided with two elastic sheets (61) symmetrically; Or / and, the outer side of mounting seat (6) is provided with protruding portion four (63), and the inner wall of connecting seat (5) is provided with connecting groove three (52) corresponding to protruding portion four (63).

4. The retraction cosmetic pencil according to claim 1, characterized in that: The limiting assembly two includes two planes one (64) symmetrically arranged in the mounting seat (6), and the screw rod (7) is formed with a plane two (71) on both sides, when the plane one (64) is parallel to the plane two (71), the screw rod (7) can rotate and cannot move, and when the plane one (64) is perpendicular to the plane two (71), the screw rod (7) cannot rotate and can move.

5. Retractable make-up pencil according to any one of claims 1-4, characterized in that: The mounting seat (6) is formed with a spiral groove one (65) on the outside, and the inner wall of the pen body (1) is provided with two screw threads one (12), and the screw threads one (12) are engaged with the spiral groove one (65); Or / and, the outer side of the screw rod (7) is formed with a spiral groove two (73), and the inner wall of the connecting seat (5) is provided with two screw threads two (53), and the screw threads two (53) are engaged with the spiral groove two (73).

6. A retraction cosmetic pencil according to any one of claims 1 to 4, characterised in that: The connecting seat (5) includes a main body (56) and an internal component (57), and the two ends of the main body (56) are connected with the mounting seat (6) and the knob (3) respectively, and the internal component (57) is located on the inner side of the main body (56), and the internal component (57) and the screw rod (7) are threadedly connected.

7. A retraction cosmetic pencil according to any one of claims 1 to 4, characterised in that: The inner wall of the pen head (2) is provided with at least one protruding part (23), and the top of the mounting seat (6) is located in the pen head (2) and abuts against the bottom of the protruding part (23).

8. A retraction cosmetic pencil according to any one of claims 1 to 4, characterised in that: The top of the screw rod (7) is provided with a plug-in part one (74), and the plug-in part one (74) is inserted into the bottom of the material body (4) to connect the screw rod (7) and the material body (4); Or / and, the top of the screw rod (7) is sleeved with a plug (9), and the top of the plug (9) is provided with a plug-in part two (91), and the plug-in part two (91) is inserted into the bottom of the material body (4) to connect the plug (9) and the material body (4).

9. Retractable make-up pencil according to any one of claims 1-4, characterized in that: The connecting seat (5) includes an upper part (54) and a lower part (55), and the bottom surface of the upper part (54) can abut against the top of the knob (3) to limit the downward movement of the connecting seat (5), and at least one convex strip one (551) is arranged on the outer side of the lower part (55), and the inner wall of the knob (3) is provided with at least two convex strips two (31), and the convex strip one (551) is located between the two convex strips two (31); Or / and, the pen body (1) is sleeved on the top outside of the knob (3), and the outer side of the knob (3) is provided with a protruding part one (32), and the inner wall of the pen body (1) is provided with a connecting groove one (11) corresponding to the protruding part one (32).

10. Retractable make-up pencil according to any one of claims 1-4, characterized in that: The bottom of the pen head (2) is located in the pen body (1), and a sealing ring one is arranged between the inner wall of the pen body (1) and the bottom of the pen head (2), the outer side of the bottom of the pen head (2) is provided with a protruding part two (21), and the inner wall of the pen body (1) is provided with a connecting groove two (13) corresponding to the protruding part two (21); Or / and, the top outside of the pen head (2) is sleeved with a cover (20), and a sealing ring two is arranged between the inner wall of the cover (20) and the pen head (2), the outer side of the pen head (2) is provided with a protruding part three (22), and the inner wall of the cover (20) is provided with at least one convex block (201), and the top of the convex block (201) abuts against the bottom of the protruding part three (22).

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