CN111513449B - Propelling structure of liquid pen and push type liquid pen - Google Patents

Abstract

The invention relates to a propelling structure of a liquid pen and a push-type liquid pen, which comprise a pen holder, wherein a piston is arranged in an inner cavity of the pen holder, the inner cavity at the front side of the piston is used for storing liquid materials, a first limiting part is arranged on the wall surface of the inner cavity at the rear side of the piston, a propelling seat is arranged in the inner cavity at the rear side of the first limiting part, an inner screw rod is arranged on the propelling seat, and the inner screw rod is connected with the piston; the rear end of the pen holder is also provided with a pressing component, one end of the pressing component is inserted into the inner cavity of the pen holder, and the other end of the pressing component protrudes out of the rear end of the pen holder; the pushing assembly can push the pushing seat to move forwards until the pushing seat abuts against the first limiting part; the number of times of first pressing water outlet is greatly reduced, and even 1 time of water outlet can be achieved. The invention can be used for cosmetic pens such as lip gloss and the like, and can also be used for writing and drawing pens for other purposes.

Description

Propelling structure of liquid pen and push type liquid pen

Technical Field

The utility model relates to a propelling structure of a liquid pen and a push type liquid pen.

Background

Liquid cosmetic pens, including lip gloss, concealer pens, etc., typically the lip gloss or other viscous liquid material is stored in a roll core made of sponge or other porous material, each time by squeezing out liquid, but so

The liquid volume that is difficult to guarantee to use at every turn is more suitable, has a push type cosmetic pencil among the prior art consequently, adopts drive assembly and screw nut's mechanism, will press the rectilinear motion transmission to the rotary motion of screw rod through drive assembly, makes at every turn press, and the rotation volume of screw rod is fixed, and then the moving amount of screw rod forward is fixed, the liquid volume of going out at every turn of control. The drive assembly is typically a ratchet assembly such as the push-on lip pencil disclosed in patent CN 204032629U. However, this structure has the following problems: in the filling process, in order to prevent liquid from overflowing, a certain gap is required to be reserved at the pen point, but the situation that a consumer needs to press for a large number of times to discharge the liquid when using the liquid for the first time is caused, and inconvenience is caused to the use of the consumer.

Disclosure of Invention

The utility model aims to overcome the defects and shortcomings in the prior art and provides a propelling structure of a liquid pen and a pressing type liquid pen.

The technical scheme adopted by the utility model is as follows:

The propelling structure of the liquid pen comprises a pen holder, wherein a piston is arranged in an inner cavity of the pen holder, the inner cavity at the front side of the piston is used for storing liquid materials, a first limiting part is arranged on the wall surface of the inner cavity at the rear side of the piston, a propelling seat is arranged in the inner cavity at the rear side of the first limiting part, an inner screw rod is arranged on the propelling seat, and the inner screw rod is connected with the piston;

the rear end of the pen holder is also provided with a pressing component, one end of the pressing component is inserted into the inner cavity of the pen holder, and the other end of the pressing component protrudes out of the rear end of the pen holder; the pushing assembly can push the pushing seat to move forwards until the pushing seat abuts against the first limiting part, and the moving distance is H;

when the pushing seat moves forwards, the pushing seat, the inner screw rod and the piston cooperatively push forwards.

Preferably, the pressing assembly comprises a pressing piece and a transmission assembly;

when the pressing piece can rotate relative to the pen holder, the transmission assembly transmits the rotation of the pressing piece to the inner screw rod, and the pressing piece and the inner screw rod synchronously rotate;

Or alternatively, the first and second heat exchangers may be,

When the pressing piece can stretch out and draw back relative to the pen holder, the transmission assembly converts stretching movement of the pressing piece into intermittent rotation, and stretching of the pressing piece drives the inner screw to intermittently rotate.

The pressing type liquid pen comprises a brush head assembly, a pressing assembly, a pen holder and a nut which are coaxially arranged, wherein the brush head assembly is connected to the front end of the pen holder, one end of the pressing assembly is inserted into an inner cavity of the pen holder in a sealing mode, the other end of the pressing assembly protrudes out of the rear end of the pen holder, a containing cavity for storing liquid materials is formed in the inner cavity of the pen holder between the brush head assembly and the pressing assembly, and the pressing assembly comprises a pressing piece, a transmission assembly and an inner screw;

an elastic piece is arranged between the propulsion seat and the transmission assembly;

The inner wall of the pen holder is provided with a first limiting part and a second limiting part, the pushing seat is provided with a third limiting part matched with the first limiting part and a fourth limiting part matched with the second limiting part, the second limiting part is positioned at one side of the fourth limiting part close to the pen point and forms a limiting effect on the fourth limiting part, the first limiting part is positioned at one side of the third limiting part close to the pen point and is separated by an H, the pressing piece is pressed at the moment, and the pushing seat can overcome the limiting effect of the second limiting part on the fourth limiting part to move towards the pen point;

When the moving distance of the pushing seat is H, the first limiting part and the third limiting part are abutted to form a limiting effect, the second limiting part is positioned on one side, close to the pen tail, of the fourth limiting part and forms a limiting effect on the pushing seat, and at the moment, the axial position of the pushing seat relative to the pen holder is fixed.

The fourth limiting part is a convex ring, the end face of the fourth limiting part, which is close to the pen point, is a guide inclined plane, the end face of the fourth limiting part, which is close to the pen tail, is a plane, the second limiting part is at least two convex blocks, and the surface of the second limiting part is a smooth curved surface. The inner wall of the pen holder is provided with a fifth limiting part, and the fifth limiting part is positioned at one side of the third limiting part close to the pen tail or at one side of the fourth limiting part close to the pen tail.

The pressing part protrudes out of the rear end of the pen holder, the transmission assembly comprises a first ratchet part and a second ratchet part, the first ratchet part is axially linked with the pressing part and is circumferentially linked with the pushing seat, the second ratchet part is circumferentially linked with the inner screw and is rotatable relative to the pushing seat, and the first ratchet part and the second ratchet part are matched to form conversion of linear driving force and rotary driving force;

the propelling seat is sleeved outside the inner screw and is in threaded connection with the inner screw.

The first ratchet piece and the second ratchet piece are hollow cylinders, and the inner screw rod penetrates through the second ratchet piece; the inner wall of the second ratchet piece is provided with a first linkage lug arranged along the axial direction, and the side wall of the inner screw is provided with a first linkage groove which is matched and spliced with the first linkage lug; the end face, close to the pen point, of the first ratchet piece is provided with at least one inclined surface, the end face, close to the pen tail, of the second ratchet piece is provided with an abutting part matched with the inclined surface, and the end face, close to the pen point, of the first ratchet piece is abutted with the end face, close to the pen tail, of the second ratchet piece; the end part of the inner screw close to the pen point is connected with a piston, and a cavity of the pen holder between the piston and the brush head assembly forms a cavity for storing liquid materials; and a reset spring is arranged between the pushing seat and the second ratchet piece.

The propulsion seat comprises a first sleeve and a second sleeve, wherein an inner screw tooth is arranged on the inner wall of the first sleeve, the first sleeve is connected with the inner screw in a matched mode, a raised sixth limiting part is arranged on the inner wall of the second sleeve, the sixth limiting part forms a limiting effect on the first ratchet piece, and the first sleeve is connected with the second sleeve in a plugging mode.

The first sleeve is provided with a plug-in part positioned in the second sleeve, the outer wall of the plug-in part is provided with a trapezoid lug, the second sleeve is provided with a plug-in groove, the side wall of the plug-in groove is provided with a limit lug, and one end of the limit lug, which is close to the pen point, is an inclined plane which is convenient for the trapezoid lug to slide through the limit lug.

The propelling seat is hollow and cylindrical, the first ratchet piece is positioned in the inner cavity of the propelling seat, the outer wall of the first ratchet piece is provided with at least one second linkage projection arranged along the axial direction, and the inner wall of the propelling seat is provided with a second linkage groove which is matched and spliced with the second linkage projection.

The pressing piece protrudes out of the rear end of the pen holder and is provided with a mark, and when the moving distance of the pushing seat is H, the mark is positioned in the pen holder.

The beneficial effects of the utility model are as follows: when the novel pen is just started to be used, the pressing piece is pressed, the transmission component is pushed, the transmission component acts on the elastic component, the elastic component pushes the pushing seat to move H towards the pen point direction against the limit action of the second limit part on the fourth limit part, the pushing seat drives the inner screw rod to move, at least part of air at the front end is extruded, then the inner screw rod is kept relatively fixed in position under the action of the first limit part and the second limit part, and then the inner screw rod can be quantitatively moved forwards through pressing, so that the number of times of water discharge after first pressing can be greatly reduced, and even 1 water discharge can be achieved. The utility model can be used for cosmetic pens such as lip gloss and the like, and can also be used for writing and drawing pens for other purposes.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that it is within the scope of the utility model to one skilled in the art to obtain other drawings from these drawings without inventive faculty.

FIG. 1 is a schematic view of an embodiment of the present utility model, (a) in an unpressed state, and (b) in a first pressed state;

in fig. 2, (a) is an enlarged schematic view of a in fig. 1, (B) is an enlarged schematic view of B in fig. 1;

In fig. 3, (a) is an enlarged schematic view of C in fig. 1, and (b) is an enlarged schematic view of D in fig. 1;

FIG. 4 is a cross-sectional view of a barrel according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a propulsion seat according to an embodiment of the present utility model;

FIG. 6 is a schematic view of a pressing assembly according to an embodiment of the present utility model;

FIG. 7 is a cross-sectional view of a pressing assembly in one embodiment of the utility model;

FIG. 8 is a cross-sectional view of a propulsion seat in one embodiment of the utility model;

FIG. 9 is a schematic view showing the structure of an inner screw in an embodiment of the present utility model;

FIG. 10 is an exploded view of a propulsion seat in one embodiment of the utility model;

FIG. 11 is an exploded view of another embodiment of the present utility model;

fig. 12 is a cross-sectional view of another embodiment of the present utility model.

In the drawing the view of the figure,

1-A brush head assembly;

2-a pressing assembly; 201-a pressing piece; 202-an inner screw; 203-a first ratchet member; 204-a second ratchet member; 205-first linkage tab; 206-a first linkage groove; 207-piston; 208-a second linkage tab; 209-marking;

3-a penholder; 301-a first limit part; 302-a second limit part; 303-a fifth limit part;

4-pushing seats; 401-a third limit part; 402-fourth limit part; 403-second sleeve; 404-sixth limit part; 405-trapezoidal bumps; 406-plug-in slot; 407-limit bump; 408-plug-in part; 409-second linkage groove; 410-a first sleeve;

5-liquid material; 6-elastic members;

70-a brush head assembly; 71-a front support sleeve; 72-an outer pen holder; 73-an inner pen holder; 74-piston; 75-an inner screw; 76-pushing seat; 77-rear support sleeve; 78-a pressing assembly; 79-tail cap.

Detailed Description

The utility model is further described with reference to the following specific examples: the present utility model will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present utility model more apparent.

It should be noted that, in the embodiments of the present utility model, all the expressions "first" and "second" are used to distinguish two entities with the same name but different entities or different parameters, and it is noted that the "first" and "second" are only used for convenience of expression, and should not be construed as limiting the embodiments of the present utility model, and the following embodiments are not described one by one.

The terms of direction and position in the present utility model, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer only to the direction or position of the drawing. Accordingly, directional and positional terms are used to illustrate and understand the utility model and are not intended to limit the scope of the utility model.

Example 1: the propelling structure of the liquid pen comprises a pen holder 3, wherein a piston 207 is arranged in an inner cavity of the pen holder 3, and the inner cavity at the front side of the piston 207 is used for storing liquid materials 5;

The rear end of the pen holder is also provided with a pressing component 2, one end of the pressing component 2 is inserted into the inner cavity of the pen holder 3, and the other end of the pressing component protrudes out of the rear end of the pen holder 3; the pushing assembly 2 can push the pushing seat 4 to move forwards until the pushing seat abuts against the first limiting part 301, and the moving distance is H;

when the pushing seat 4 moves forward, the pushing seat 4, the inner screw 202 and the piston 207 are pushed forward cooperatively.

Preferably, the pressing assembly 2 includes a pressing member 201 and a transmission assembly;

The pressing piece 201 can stretch and retract relative to the pen holder 3, the transmission assembly converts stretching and retracting movement of the pressing piece 201 into intermittent rotation, and stretching and retracting of the pressing piece 201 drives the inner screw 202 to intermittently rotate.

As shown in fig. 1, a push type liquid pen comprises a brush head assembly 1, a push assembly 2, a pen holder 3 and a pushing seat 4 which are coaxially arranged, wherein the brush head assembly 1 is connected to the front end of the pen holder 3, one end of the push assembly 2 is inserted into an inner cavity of the pen holder 3 in a sealing way, the other end of the push assembly protrudes out of the rear end of the pen holder 3, a cavity for storing liquid materials 5 is formed in the inner cavity of the pen holder 3 between the brush head assembly 1 and the push assembly 2, and the push assembly 2 comprises a push piece 201, a transmission assembly and an inner screw 202;

An elastic piece 6 is arranged between the propulsion seat 4 and the transmission component;

The inner wall of the pen holder 3 is provided with a first limiting part 301 and a second limiting part 302, the pushing seat 4 is provided with a third limiting part 401 matched with the first limiting part 301 and a fourth limiting part 402 matched with the second limiting part 302, the second limiting part 302 is positioned at one side of the fourth limiting part 402 close to the pen point and forms a limiting effect on the fourth limiting part 402, the first limiting part 301 is positioned at one side of the third limiting part 401 close to the pen point and is separated by an interval H, the pressing piece 201 is pressed at the moment, and the pushing seat 4 can overcome the limiting effect of the second limiting part 302 on the fourth limiting part 402 to move towards the pen point;

When the moving distance of the pushing seat 4 is H, the first limiting portion 301 and the third limiting portion 401 abut against each other to form a limiting effect, and the second limiting portion 302 is located at one side of the fourth limiting portion 402, which is close to the tail, and forms a limiting effect on the pushing seat 4, at this time, the axial position of the pushing seat 4 relative to the pen holder 3 is fixed.

When the novel pen is used, the pressing piece is pressed, the transmission assembly is pushed, the transmission assembly acts on the elastic piece, the elastic piece pushes the pushing seat to overcome the limit effect of the second limit part on the fourth limit part to move H towards the pen point direction, the pushing seat drives the inner screw rod to move, at least part of air at the front end is extruded, then the position is relatively fixed under the effect of the first limit part and the second limit part, the inner screw rod can be pushed forward to quantitatively move through pressing, and the number of times of first pressing water outlet can be greatly reduced and even is 0.

As shown in fig. 3 and 5, the fourth limiting portion 402 is a convex ring, an end surface of the fourth limiting portion 402 near the pen tip is a guiding inclined plane, an end surface of the fourth limiting portion near the pen tail is a plane, the second limiting portion 302 is at least two protruding blocks, and a surface of the second limiting portion 302 is a smooth curved surface. When the pressing piece is pushed for the first time, under the action of the guide inclined plane and the smooth curved surface, the fourth limiting part 402 can slide over the second limiting part 302, after sliding over, the pushing seat is pushed by no external force in the pen holder 3 and is limited by the first limiting part 301 and the second limiting part 302 and does not move any more.

The inner wall of the pen holder 3 is provided with a fifth limiting part 303, and the fifth limiting part 303 is positioned at one side of the third limiting part 401 close to the pen tail or at one side of the fourth limiting part 402 close to the pen tail. The fifth limiting part 303 can prevent the pushing seat from falling out of the pen holder when the pressing piece is not pushed.

As shown in fig. 6 and 7, the pressing member 201 partially protrudes from the rear end of the pen holder 3, the transmission assembly includes a first ratchet member 203 and a second ratchet member 204, the first ratchet member 203 is axially linked with the pressing member 201 and is circumferentially linked with the pushing seat 4, the second ratchet member 204 is circumferentially linked with the inner screw 202 and is rotatable relative to the pushing seat 4, and the first ratchet member 203 and the second ratchet member 204 cooperate to form a conversion between a linear driving force and a rotational driving force;

The pushing seat 4 is sleeved outside the inner screw 202 and is in threaded connection with the inner screw 202.

The elastic member 6 is a spring and is disposed between the propulsion seat 4 and the second ratchet member 204.

The first ratchet piece 203 and the second ratchet piece 204 are hollow cylinders, and the inner screw 202 penetrates through the second ratchet piece 204; the inner wall of the second ratchet piece 204 is provided with a first linkage lug 205 arranged along the axial direction, and the side wall of the inner screw 202 is provided with a first linkage groove 206 which is in fit connection with the first linkage lug 205; the end face, close to the pen point, of the first ratchet piece 203 is provided with at least one inclined surface, the end face, close to the pen tail, of the second ratchet piece 204 is provided with an abutting part matched with the inclined surface, and the end face, close to the pen point, of the first ratchet piece 203 abuts against the end face, close to the pen tail, of the second ratchet piece 204; the end part of the inner screw 202, which is close to the pen point, is connected with a piston 207, and a cavity part of the pen holder 3 between the piston and the brush head assembly 1 forms a cavity for storing liquid materials 5.

As shown in fig. 8, the pushing seat 4 includes a first sleeve 410 and a second sleeve 403, the inner wall of the first sleeve 410 has an inner screw thread, the first sleeve 410 is connected and matched with the inner screw 202, the inner wall of the second sleeve 403 is provided with a raised sixth limiting portion 404, the sixth limiting portion 404 forms a limiting effect on the first ratchet member 203, and the first sleeve 410 and the second sleeve 403 are connected in a plugging manner. The sixth limiting portion 404 forms a limiting fixing action on the first ratchet member 203 and the second ratchet member 204. The pressing member 201 is fixedly connected with the first ratchet member 203.

As shown in fig. 10, the first sleeve 410 has a plugging portion 408 located in the second sleeve 403, a trapezoidal bump 405 is disposed on an outer wall of the plugging portion 408, a plugging slot 406 is disposed on the second sleeve 403, a limit bump 407 is disposed on a side wall of the plugging slot 406, and an end of the limit bump 407 close to the pen point is an inclined plane for facilitating the trapezoidal bump 405 to slide over the limit bump 407. Facilitating assembly of the first sleeve 410 and the second sleeve 403 after being sleeved outside the first ratchet member 203 and the second ratchet member 204.

The pushing seat 4 is hollow and cylindrical, the first ratchet member 203 is located in the inner cavity of the pushing seat 4, at least one second linkage protrusion 208 disposed along the axial direction is disposed on the outer wall of the first ratchet member 203, and a second linkage groove 409 adapted to and inserted into the second linkage protrusion 208 is disposed on the inner wall of the pushing seat 4.

The structure is convenient to assemble, stable in structure and long in service life. The pressing piece 201 protrudes from the rear end of the pen holder 3, and a mark 209 is arranged on the pressing piece, and when the moving distance of the pushing seat 4 is H, the mark 209 is positioned in the pen holder 3.

In the figure, the mark 209 is a circle of grooves, and the mark 209 is convenient for a user to determine that the mark is pressed in place.

Embodiment 2, as shown in fig. 11 and 12, is basically the same as embodiment 1, except that the pressing member 78 is rotatable relative to the barrel, and the transmission assembly 781 at the front side of the pressing member 78 transmits the rotation of the pressing member 78 to the inner screw 75, and the pressing member 78 rotates synchronously with the inner screw 75.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.

Claims (8)

1. The propelling structure of the liquid pen comprises a pen holder (3), wherein a piston (207) is arranged in an inner cavity of the pen holder (3), and the inner cavity at the front side of the piston (207) is used for storing liquid materials (5), and the propelling structure is characterized in that a propelling seat (4) is arranged in the inner cavity at the rear side of the piston (207), an inner screw (202) is arranged on the propelling seat (4), and the inner screw (202) is connected with the piston (207);

the rear end of the pen holder is also provided with a pressing component (2), one end of the pressing component (2) is inserted into the inner cavity of the pen holder (3), and the other end of the pressing component protrudes out of the rear end of the pen holder (3); the pushing assembly (2) can push the pushing seat (4) to move forwards for a set distance;

When the pushing seat (4) moves forwards, the pushing seat (4), the inner screw (202) and the piston (207) are pushed forwards cooperatively;

a first limiting part (301) is arranged on the wall surface of the inner cavity at the rear side of the piston (207), and the pushing seat (4) abuts against the first limiting part (301) after moving forwards for a set distance;

A second limiting part (302) is further arranged on the wall surface of the inner cavity at the rear side of the piston (207), and the second limiting part (302) is positioned at the rear side of the first limiting part (301); when the pushing seat (4) moves forwards to be abutted against the first limiting part (301), the rear side of the pushing seat (4) is abutted against the second limiting part (302), and the pushing seat (4) is axially limited;

a fourth limiting part (402) is arranged at the rear side of the propulsion seat (4), the fourth limiting part (402) is a convex ring, and the fourth limiting part (402) is matched with the second limiting part (302); the end face, close to the pen point, of the fourth limiting part (402) is a guide inclined plane, the end face, close to the pen tail, of the fourth limiting part (402) is a plane, the second limiting part (302) is at least two convex blocks, and the surface of the second limiting part (302) is a smooth curved surface;

The inner wall of the pen holder (3) is provided with a fifth limiting part (303), and the fifth limiting part (303) is positioned at one side of the third limiting part (401) close to the pen tail or at one side of the fourth limiting part (402) close to the pen tail.

2. A propelling structure of a liquid pen as claimed in claim 1, wherein: the pressing assembly (2) comprises a pressing piece (201) and a transmission assembly;

When the pressing piece (201) rotates relative to the pen holder (3), the transmission assembly transmits the rotation of the pressing piece (201) to the inner screw (202), and the pressing piece (201) and the inner screw (202) synchronously rotate;

Or alternatively, the first and second heat exchangers may be,

When the pressing piece (201) stretches relative to the pen holder (3), the transmission assembly converts stretching motion of the pressing piece (201) into intermittent rotation, and stretching of the pressing piece (201) drives the inner screw (202) to intermittently rotate.

3. A push-type liquid pen, characterized by comprising the push-in structure of claim 2,

The pressing piece (201) can stretch and retract relative to the pen holder (3),

An elastic piece (6) is arranged between the propulsion seat (4) and the transmission assembly;

The transmission assembly comprises a first ratchet piece (203) and a second ratchet piece (204), wherein the first ratchet piece (203) is axially linked with the pressing piece (201) and is circumferentially linked with the pushing seat (4), the second ratchet piece (204) is circumferentially linked with the inner screw (202) and is rotatable relative to the pushing seat (4), and the first ratchet piece (203) and the second ratchet piece (204) are matched to form conversion of linear driving force and rotary driving force;

the pushing seat (4) is sleeved outside the inner screw (202) and is in threaded connection with the inner screw (202).

4. A pen as claimed in claim 3, wherein: the first ratchet piece (203) and the second ratchet piece (204) are hollow cylinders, and the inner screw (202) is arranged in the second ratchet piece (204) in a penetrating way; the inner wall of the second ratchet piece (204) is provided with a first linkage lug (205) arranged along the axial direction, and the side wall of the inner screw (202) is provided with a first linkage groove (206) which is in fit connection with the first linkage lug (205); the end face, close to the pen point, of the first ratchet piece (203) is provided with at least one inclined surface, the end face, close to the pen tail, of the second ratchet piece (204) is provided with an abutting part matched with the inclined surface, and the end face, close to the pen point, of the first ratchet piece (203) is abutted with the end face, close to the pen tail, of the second ratchet piece (204); one end part of the inner screw rod (202) close to the pen point is connected with a piston (207), and a cavity part of the pen holder (3) between the piston and the brush head assembly (1) forms a containing cavity for storing liquid materials (5).

5. The pen of claim 4, wherein: the propulsion seat (4) comprises a first sleeve (410) and a second sleeve (403), wherein an inner screw tooth is arranged on the inner wall of the first sleeve (410), the first sleeve (410) is connected with the inner screw (202) in a matched mode, a raised sixth limiting part (404) is arranged on the inner wall of the second sleeve (403), the sixth limiting part (404) forms a limiting effect on the first ratchet piece (203), and the first sleeve (410) is connected with the second sleeve (403) in a plugging mode.

6. The pen of claim 5, wherein: the first sleeve (410) is provided with a plug-in part (408) positioned in the second sleeve (403), the outer wall of the plug-in part (408) is provided with a trapezoid lug (405), the second sleeve (403) is provided with a plug-in groove (406), the side wall of the plug-in groove (406) is provided with a limit lug (407), and one end of the limit lug (407) close to the pen point is an inclined plane which is convenient for the trapezoid lug (405) to slide through the limit lug (407).

7. The push-type liquid pen of any one of claims 3-6, wherein: the propelling seat (4) is hollow and cylindrical, the first ratchet piece (203) is located in the inner cavity of the propelling seat (4), at least one second linkage lug (208) arranged along the axial direction is arranged on the outer wall of the first ratchet piece (203), and a second linkage groove (409) which is matched and spliced with the second linkage lug (208) is formed in the inner wall of the propelling seat (4).

8. The push-type liquid pen of claim 5 or 6, wherein: the pressing piece (201) protrudes out of the rear end of the pen holder (3) and is provided with a mark (209), and when the pushing seat (4) moves forwards for a set distance, the mark (209) is positioned in the pen holder (3).