阅读说明：本技术 一种3d打印笔 (3D printing pen ) 是由 熊春霞 于 2020-11-10 设计创作，主要内容包括：本发明涉及3D打印笔技术领域,且公开了一种3D打印笔。一种3D打印笔,包括墨盒组件,墨盒组件的底部与外壳固定连接,墨盒组件的底部与导管组件连通,导管组件的底部与第二导管连通,所述第二导管的表面套接有加热管；本发明通六个隔板和空心圆柱将盒体均分为六个大小相同的单色墨盒,并在空心圆柱的内腔的底部固定安装了第一马达,利用第一马达驱动底部的挡板,而挡板的一侧设置有一个扇形的缺口,在每个单色墨盒的底部设置了通孔,在需要转换不同颜色的打印材料时,启动第一马达,第一马达带动挡板转动,使得挡板的扇形缺口与对应的单色墨盒底部的通孔,使得打印材料流入到集料斗中,随后通过导管组件流入内部。(The invention relates to the technical field of 3D printing pens and discloses a 3D printing pen. A3D printing pen comprises an ink box assembly, wherein the bottom of the ink box assembly is fixedly connected with a shell, the bottom of the ink box assembly is communicated with a conduit assembly, the bottom of the conduit assembly is communicated with a second conduit, and a heating pipe is sleeved on the surface of the second conduit; according to the invention, the box body is equally divided into six monochromatic ink boxes with the same size through six partition plates and the hollow cylinder, the bottom of the inner cavity of the hollow cylinder is fixedly provided with the first motor, the baffle at the bottom is driven by the first motor, one side of the baffle is provided with the fan-shaped notch, the bottom of each monochromatic ink box is provided with the through hole, when printing materials with different colors need to be converted, the first motor is started, the first motor drives the baffle to rotate, so that the fan-shaped notch of the baffle and the corresponding through hole at the bottom of the monochromatic ink box enable the printing materials to flow into the collecting hopper, and then flow into the interior through the guide pipe assembly.)

1. A3D printing pen, including ink horn subassembly (1), its characterized in that: the bottom of the ink box assembly (1) is fixedly connected with the shell (2), the bottom of the ink box assembly (1) is communicated with the conduit assembly (3), the bottom of the conduit assembly (3) is communicated with the second conduit (4), the surface of the second conduit (4) is sleeved with the heating pipe (5), the surface of the heating pipe (5) is sleeved with the heat insulation layer (6), and the bottom of the shell (2) is fixedly connected with the pen point (9);

the ink box assembly (1) comprises a box body (101), a partition plate (102), a first motor (103), a baffle plate (105), a material collecting hopper (107) and a hollow cylinder (108), wherein the partition plate (102) is fixedly installed inside the box body (101), the hollow cylinder (108) is fixedly installed inside the box body (101), the first motor (103) is fixedly installed at the bottom of the inner cavity of the hollow cylinder (108), a through hole (104) is formed in the bottom of the box body (101), the middle of the baffle plate (105) is fixedly connected with an output shaft of the first motor (103), a feeding hole (106) is formed in the top of the box body (101), the bottom of the box body (101) is fixedly connected with the material collecting hopper (107), and the bottom of the material collecting hopper (107) is fixedly connected with a shell (2).

2. A 3D printing pen according to claim 1, characterized in that: the bottom of the surface of the left side and the bottom of the surface of the right side of the shell (2) are provided with heat dissipation ports (7); the left side and the right side of the bottom of the inner cavity of the shell (2) are both provided with fans (8), and the air outlets of the fans (8) are arranged corresponding to the positions of the heat dissipation ports (7).

3. A 3D printing pen according to claim 1, characterized in that: the hollow cylinder (108) is fixedly arranged at the central position of the box body (101); the number of the partition plates (102) and the number of the through holes (104) are six, the partition plates (102) divide the inner cavity of the box body (101) into six independent spaces, and the six through holes (104) are arranged in the middles of the bottom surfaces of the six independent spaces respectively.

4. A 3D printing pen according to claim 1, characterized in that: the conduit assembly (3) comprises a first connecting piece (301), a conduit (302), an internal spiral blade (303), a second motor (304), a driving gear (305), a driven gear (306), a motor support (307), a hydraulic pump (308) and a second connecting piece (309), wherein the upper part of the first connecting piece (301) is communicated with the aggregate bin (107), the lower part of the first connecting piece (301) is rotatably connected with the conduit (302) through a bearing, the inner wall of the conduit (302) is fixedly provided with the spiral blade (303), the second motor (304) is fixedly connected with the motor support (307), the motor support (307) is fixedly arranged in the shell (2), the driving gear (305) is sleeved on the surface of the output shaft of the second motor (304), the driving gear (305) is meshed with the driven gear (306), and the driven gear is sleeved on the surface of the conduit (302), the bottom end of the guide pipe (302) is rotatably connected with a second connecting piece (309) through a bearing, and the bottom of the second connecting piece (309) is communicated with a hydraulic pump (308).

5. A 3D printing pen according to claim 1, characterized in that: the pen point (9) comprises a grip (901), a corrugated pipe (902), a discharge pipe (903), a threaded sleeve (904), a clamping groove (905), a spring (907), a clamping pin (908) and a push rod (909), wherein the upper outer shell (2) of the grip (901) is fixedly connected, the upper portion of the corrugated pipe (902) is communicated with a second conduit (4), the bottom of the corrugated pipe (902) is communicated with the discharge pipe (903), the threaded sleeve (904) is sleeved on the surface of the discharge pipe (903) and is in threaded connection with the discharge pipe (903), the clamping groove (905) is arranged at the top of the threaded sleeve (904), a movable groove (906) is arranged in the middle of the grip (901), the spring (907) is arranged inside the movable groove (906), the spring (907) is sleeved on the surface of the clamping pin (908), and the left side of the clamping pin (908) is fixedly connected with the push rod (909), the middle part of the left side surface of the handle (901) is provided with a sliding groove (910), and the push rod (909) is connected with the handle (901) in a sliding way through the sliding groove (910).

6. A3D printing pen according to claim 5, characterized in that: the handle (901) is composed of two sections of circular tubes which are symmetrical up and down, the side surfaces of the circular tubes are arranged in a concave curved surface, and the threaded sleeve (904) is clamped in the middle of the two sections of the handle (901) and is rotationally connected with the handle (901).

7. A3D printing pen according to claim 5, characterized in that: the number of the clamping grooves (905) is a plurality of, the clamping grooves (905) are evenly distributed on the surface of the top of the threaded sleeve (904), and the size of the clamping grooves (905) is matched with that of the clamping pins (908).

8. A3D printing pen according to claim 5, characterized in that: bellows (902) are heat-resisting type corrugated hose, and bellows (902) are the preparation of PP material, and its applicable temperature is at thirty degrees centigrade below zero to one hundred fifty degrees centigrade.

Technical Field

The invention relates to the technical field of 3D printing pens, in particular to a 3D printing pen.

Background

The 3D printer (3DP), a magic printer designed by the inventor named enricho dini (enrico dini), not only "prints" a complete building, but also prints any desired shape of an item to an astronaut even on a space shuttle. However, 3D prints out a model of the object, and cannot print out the function of the object. The 3D printing pen is the first pen in the world with 3D printing function. By using PLA and ABS plastics, the 3D printing pen can write on any surface and can draw pictures in the air directly. It is compact and does not require a computer or computer software support.

When a common 3D printing pen is used for multicolor printing, different color materials and feeding pipelines need to be replaced, and the feeding pipelines are disassembled and assembled, so that certain trouble is brought to people in use, and different requirements of people cannot be met; meanwhile, as the material is drawn under the condition of heating, the temperature of a pen point is about 70-80 degrees (note: the material is only limited to 3D printing pens produced in China, the pen point of the domestic 3D printing pen is ceramic, and is subjected to cooling treatment, but the foreign 3D printing pen is made of metal copper, and the temperature can reach more than 200 degrees), and if the pen point is touched, a user, particularly a child, can be scalded.

Disclosure of Invention

The invention aims to provide a 3D printing pen, which can achieve the purposes that the 3D printing pen can simultaneously use printing materials with various colors and effectively avoid scalding a user.

In order to achieve the purpose, the invention provides the following technical scheme: A3D printing pen comprises an ink box assembly, wherein the bottom of the ink box assembly is fixedly connected with a shell, the bottom of the ink box assembly is communicated with a conduit assembly, the bottom of the conduit assembly is communicated with a second conduit, a heating pipe is sleeved on the surface of the second conduit, a heat insulation layer is sleeved on the surface of the heating pipe, and the bottom of the shell is fixedly connected with a pen point;

the ink box component comprises a box body, a partition plate, a first motor, a baffle plate, a material collecting hopper and a hollow cylinder, wherein the partition plate is fixedly arranged in the box body, the hollow cylinder is fixedly arranged in the box body, the first motor is fixedly arranged at the bottom of the inner cavity of the hollow cylinder, a through hole is formed in the bottom of the box body, the middle of the baffle plate is fixedly connected with an output shaft of the first motor, a feed inlet is formed in the top of the box body, the bottom of the box body is fixedly connected with the material collecting hopper, and the bottom of the material collecting hopper is fixedly connected with the shell.

Preferably, the bottom of the surface of the left side and the bottom of the surface of the right side of the shell are provided with heat dissipation ports; the left and right sides of shell inner chamber bottom all is provided with the fan, the air outlet of fan corresponds the position setting of thermovent.

Preferably, the hollow cylinder is fixedly arranged at the central position of the box body; the quantity of baffle and through-hole is six, the baffle is equallyd divide into six independent spaces with the inner chamber of box body, six the through-hole sets up respectively in the middle part of six independent space bottom surfaces.

Preferably, the pipe subassembly includes first connecting piece, pipe, interior helical blade, second motor, driving gear, driven gear, motor support, hydraulic pump, second connecting piece, the upper portion and the collecting hopper intercommunication of first connecting piece, the lower part of first connecting piece is passed through the bearing and is connected with the pipe rotation, the inner wall of pipe is fixed to be equipped with helical blade, second motor and motor support fixed connection, affiliated motor support and fixed mounting are in the inside of shell, the driving gear cup joints the surface at second motor output shaft, driving gear and driven gear meshing, driven gear cup joints the surface at the pipe, the bottom of pipe is passed through bearing and second connecting piece swivelling joint, the bottom and the hydraulic pump intercommunication of second connecting piece.

Preferably, the nib includes the handle, the bellows, the discharging pipe, the thread bush, the draw-in groove, the spring, the bayonet lock, the push rod, the upper portion shell fixed connection of handle, the upper portion and the second pipe intercommunication of bellows, the bottom and the discharging pipe intercommunication of bellows, the thread bush cup joints on the surface of discharging pipe and passes through threaded connection with the discharging pipe, the top of thread bush is provided with the draw-in groove, the middle part of handle is provided with the activity groove, the spring sets up the inside at the activity groove, the spring cup joints on the surface of bayonet lock, the left side and the push rod fixed connection of bayonet lock, the middle part of handle left side surface is provided with the spout, the push rod passes through spout and handle sliding connection.

Preferably, the handle is composed of two sections of circular tubes which are symmetrical up and down, the side surfaces of the circular tubes are arranged in a concave curved surface, and the threaded sleeves are clamped in the middle of the two sections of handles and are in rotating connection with the handles.

Preferably, the clamping grooves are distributed on the surface of the top of the threaded sleeve uniformly, and the size of each clamping groove is matched with that of each clamping pin.

Preferably, the corrugated pipe is a heat-resistant corrugated hose, is made of a PP (polypropylene) material and has an application temperature of minus thirty degrees centigrade to one hundred fifty degrees centigrade.

The invention provides a 3D printing pen. The method has the following beneficial effects:

(1) according to the invention, the ink box assembly is arranged at the top of the 3D printing pen, so that a user can conveniently convert printing materials with different colors, in the ink box assembly, the box body is uniformly divided into six single-color ink boxes with the same size by using six partition plates and a hollow cylinder, the bottom of the inner cavity of the hollow cylinder is fixedly provided with a first motor, the first motor is used for driving a baffle at the bottom, one side of the baffle is provided with a fan-shaped notch, the bottom of each single-color ink box is provided with a through hole, when the printing materials with different colors need to be converted, the first motor is started and drives the baffle to rotate, so that the fan-shaped notch of the baffle and the corresponding through hole at the bottom of the single-color ink box enable the printing materials to flow into the collecting hopper and then flow into the.

(2) According to the invention, the printing raw materials can flow rapidly and uniformly through the catheter component, so that the use efficiency of the 3D printing pen is improved; in the pipe subassembly, helical blade has been fixed to the inside at the pipe, the upper portion and the lower part of pipe are connected through bearing and first connecting piece and second respectively and are rotated and be connected simultaneously, driven gear has cup jointed on the surface of pipe simultaneously, and driven gear and driving gear meshing, the driving gear passes through the drive of second motor, after the inside of printing material flow in the pipe through the collecting hopper, the second motor starts, the driving gear of cup jointing on second motor output shaft surface rotates thereupon, and drive driven gear rotates, and then make the pipe rotate, under inside helical blade's effect, make the printing material at the quick even flow in inside of pipe.

(3) The handle formed by two sections of inwards-concave cambered surface cylinders is arranged in the pen head, the shape of the traditional pen head which is directly inwards concave is improved, so that a user is effectively prevented from being scalded, meanwhile, the middle of the handle is provided with the threaded sleeve which is rotatably connected with the handle, the threaded sleeve is sleeved on the surface of the discharge pipe and is in threaded connection with the discharge pipe, the purpose of stretching the discharge pipe is achieved by rotating the threaded sleeve through matching with the corrugated pipe on the upper part of the discharge pipe, the user can conveniently adjust the length of the discharge pipe, the 3D printing pen is more convenient to use, meanwhile, the discharge pipe is taken into the handle after the use is completed, the discharge pipe is protected, and the service life of the 3D printing pen is.

Drawings

FIG. 1 is a front cross-sectional view of the present invention;

FIG. 2 is an enlarged view of A in FIG. 1;

FIG. 3 is an enlarged view of B in FIG. 1;

FIG. 4 is a schematic top sectional view of the case;

FIG. 5 is a schematic top view of the baffle;

FIG. 6 is a side view of the connection between the grip and the push rod.

In the figure: 1 ink box component, 101 box body, 102 clapboard, 103 first motor, 104 through hole, 105 baffle, 106 feed inlet, 107 collecting hopper, 108 hollow cylinder, 2 outer shell, 3 conduit component, 301 first connecting piece, 302 conduit, 303 helical blade, 304 second motor, 305 driving gear, 306 driven gear, 307 motor bracket, 308 hydraulic pump, 309 second connecting piece, 4 second conduit, 5 heating pipe, 6 heat insulation layer, 7 heat radiation port, 8 fan, 9 pen point, 901 handle, 902 corrugated pipe, 903 discharge pipe, 904 screw sleeve, 905 clamping groove, 906 movable groove, 907 spring, 908 clamping pin, 909 push rod, 910 sliding groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1 to 6, the present invention provides a technical solution: A3D printing pen, includes ink horn subassembly 1, its characterized in that: the bottom of the ink box component 1 is fixedly connected with the shell 2, and the bottom of the surface of the left side and the bottom of the surface of the right side of the shell 2 are provided with heat dissipation ports 7; the left side and the right side of the bottom of the inner cavity of the shell 2 are both provided with fans 8, the air outlets of the fans 8 are arranged corresponding to the positions of the heat dissipating ports 7, the bottom of the ink box component 1 is communicated with the conduit component 3, the conduit component 3 comprises a first connecting piece 301, a conduit 302, an inner spiral blade 303, a second motor 304, a driving gear 305, a driven gear 306, a motor support 307, a hydraulic pump 308 and a second connecting piece 309, the upper part of the first connecting piece 301 is communicated with the collecting hopper 107, the lower part of the first connecting piece 301 is rotatably connected with the conduit 302 through a bearing, the inner wall of the conduit 302 is fixedly provided with the spiral blade 303, the second motor 304 is fixedly connected with the motor support 307, the motor support 307 is fixedly arranged in the shell 2, the driving gear 305 is sleeved on the surface of the output shaft of the second motor 304, the driving gear 305 is meshed with the driven gear 306, the driven gear is sleeved on the surface of the, the bottom of the second connection member 309 communicates with the hydraulic pump 308; the printing raw materials can flow rapidly and uniformly through the catheter component 3, so that the use efficiency of the 3D printing pen is improved; in the conduit assembly 3, a helical blade 303 is fixedly installed inside the conduit 302, the upper part and the lower part of the conduit 302 are respectively rotatably connected with a first connecting piece 301 and a second connecting piece 309 through bearings, a driven gear 306 is sleeved on the surface of the conduit 302, the driven gear 306 is meshed with a driving gear 305, the driving gear 305 is driven by a second motor 304, after the printing material flows into the interior of the conduit 302 through a collecting hopper 107, the second motor 304 is started, the driving gear 305 sleeved on the surface of an output shaft of the second motor 304 rotates along with the driving gear 306, and drives the driven gear 306 to rotate, so that the conduit 302 rotates, the printing material is enabled to rapidly and uniformly flow in the interior of the conduit 302 under the action of the internal helical blade 303, the bottom of the conduit assembly 3 is communicated with a second conduit 4, a heating pipe 5 is sleeved on the surface of the second conduit 4, a heat insulation layer 6 is sleeved on the surface of the heating, the bottom of the shell 2 is fixedly connected with a pen point 9, the pen point 9 comprises a handle 901, a corrugated pipe 902, a discharge pipe 903, a threaded sleeve 904, a clamping groove 905, a spring 907, a clamping pin 908, a push rod 909 and an upper part of the handle 901, the handle 901 is composed of two sections of circular pipes which are vertically symmetrical, the side surfaces of the circular pipes are arranged in a concave curved surface, the threaded sleeve 904 is clamped in the middle of the two sections of the handle 901 and is rotatably connected with the handle 901, the upper part of the corrugated pipe 902 is communicated with a second conduit 4, the corrugated pipe 902 is a heat-resistant corrugated hose, the corrugated pipe 902 is made of a PP material and is suitable for being heated from minus thirty ℃ to one hundred fifty ℃, the bottom of the corrugated pipe 902 is communicated with the discharge pipe 903, the threaded sleeve 904 is sleeved on the surface of the discharge pipe 903 and is in threaded connection with the discharge pipe 903, the clamping groove 905 is arranged at the top of the threaded sleeve 904, the size of the clamping groove 905 is matched with that of the clamping pin 908, the middle part of the handle 901 is provided with a movable groove 906, the spring 907 is arranged inside the movable groove 906, the spring 907 is sleeved on the surface of the clamping pin 908, the left side of the clamping pin 908 is fixedly connected with the push rod 909, the middle part of the left side surface of the handle 901 is provided with a sliding groove 910, and the push rod 909 is in sliding connection with the handle 901 through the sliding groove 910; the handle 901 consisting of two sections of concave cambered cylinders is arranged in the pen head 9, so that the shape of the traditional pen head which is directly concave is improved, the scald of a user is effectively avoided, meanwhile, the middle part of the handle 901 is provided with the threaded sleeve 904 which is rotatably connected with the handle 901, the threaded sleeve 904 is sleeved on the surface of the discharge pipe 903 and is in threaded connection with the discharge pipe 903, the corrugated pipe 902 on the upper part of the discharge pipe 903 is matched, the purpose of stretching the discharge pipe 903 is achieved by rotating the threaded sleeve 904, the user can conveniently adjust the length of the discharge pipe 903, the 3D printing pen is more convenient to use, meanwhile, the discharge pipe 901 is collected into the handle 901 after the use is finished, the discharge pipe 903 is protected, and the service life of the 3D printing pen is;

the ink box component 1 comprises a box body 101, a partition plate 102, a first motor 103, a baffle plate 105, a collecting hopper 107 and a hollow cylinder 108, wherein the partition plate 102 is fixedly arranged inside the box body 101, the hollow cylinder 108 is fixedly arranged inside the box body 101, and the hollow cylinder 108 is fixedly arranged at the central position of the box body 101; the number of the partition plates 102 and the number of the through holes 104 are six, the partition plates 102 divide the inner cavity of the box body 101 into six independent spaces, the six through holes 104 are respectively arranged in the middles of the bottom surfaces of the six independent spaces, the first motor 103 is fixedly arranged at the bottom of the inner cavity of the hollow cylinder 108, the through holes 104 are arranged at the bottom of the box body 101, the middle of the baffle 105 is fixedly connected with an output shaft of the first motor 103, the top of the box body 101 is provided with a feed inlet 106, the bottom of the box body 101 is fixedly connected with a material collecting hopper 107, and the bottom of the material collecting hopper 107 is fixedly; through set up ink horn subassembly 1 at 3D print pen top, the person of being convenient for converts the printing material of different colours, in ink horn subassembly 1, utilize six baffles 102 and hollow cylinder 108 to divide box body 101 equally into six monochromatic print cartridges that the size is the same, and at the bottom of the inner chamber of hollow cylinder 108 fixed mounting first motor 103, utilize first motor 103 to drive the baffle 105 of bottom, and one side of baffle 105 is provided with a sectorial breach, set up through-hole 104 in the bottom of every monochromatic print cartridge simultaneously, when needing to convert the printing material of different colours, start first motor 103, first motor 103 drives baffle 105 and rotates, make the sectorial breach of baffle 105 and the through-hole 104 of corresponding monochromatic print cartridge bottom, make the printing material flow into the collecting hopper 107, flow into inside through conduit subassembly 3 afterwards.

The working principle is as follows: the ink box assembly 1 is arranged at the top of a 3D printing pen, so that a user can conveniently convert printing materials of different colors, in the ink box assembly 1, a box body 101 is uniformly divided into six single-color ink boxes with the same size by using six partition plates 102 and a hollow cylinder 108, a first motor 103 is fixedly arranged at the bottom of an inner cavity of the hollow cylinder 108, a baffle 105 at the bottom is driven by the first motor 103, a fan-shaped notch is formed in one side of the baffle 105, a through hole 104 is formed in the bottom of each single-color ink box, when the printing materials of different colors need to be converted, the first motor 103 is started, the baffle 105 is driven by the first motor 103 to rotate, the fan-shaped notch of the baffle 105 and the corresponding through hole 104 in the bottom of the single-color ink box are enabled to flow into a collecting hopper 107, and then flow into the ink boxes through a conduit; the printing raw materials can flow rapidly and uniformly through the catheter component 3, so that the use efficiency of the 3D printing pen is improved; in the conduit assembly 3, a helical blade 303 is fixedly installed inside a conduit 302, the upper part and the lower part of the conduit 302 are respectively rotatably connected with a first connecting piece 301 and a second connecting piece 309 through bearings, a driven gear 306 is sleeved on the surface of the conduit 302, the driven gear 306 is meshed with a driving gear 305, the driving gear 305 is driven by a second motor 304, after a printing material flows into the interior of the conduit 302 through a collecting hopper 107, the second motor 304 is started, the driving gear 305 sleeved on the surface of an output shaft of the second motor 304 rotates along with the driving gear 306, the driven gear 306 is driven to rotate, the conduit 302 is further driven to rotate, and the printing material is enabled to rapidly and uniformly flow in the interior of the conduit 302 under the action of the internal helical blade 303; set up handle 901 by two sections indent cambered surface cylinder constitutions in nib 9, the direct indent shape of nib in the past has been improved, thereby effectively avoid the user to scald, and simultaneously and set up one in the middle part of holding handle 901 and rotated the thread bush 904 of being connected with handle 901, thread bush 904 cup joints the surface of discharging pipe 903 and passes through threaded connection with it, bellows 902 on cooperation discharging pipe 903 upper portion, and then reach the purpose of flexible discharging pipe 903 through rotating thread bush 904, convenient to use person adjusts the length of discharging pipe 903, it is more convenient to make 3D print pen's use, it is inside handle 901 to take discharging pipe 901 after the use is accomplished simultaneously, protect discharging pipe 903, the life of extension 3D print pen.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.