CN214188481U

CN214188481U - 3D print head

Info

Publication number: CN214188481U
Application number: CN202023130627.9U
Authority: CN
Inventors: 张淮; 王博
Original assignee: Senbo Yancheng 3d Technology Co ltd
Current assignee: Senbo Yancheng 3d Technology Co ltd
Priority date: 2020-12-23
Filing date: 2020-12-23
Publication date: 2021-09-14
Anticipated expiration: 2030-12-23

Abstract

The invention discloses a 3D printer nozzle, which comprises an upper shell and a lower shell, wherein the upper shell is clamped and fixed at the upper end of the lower shell, a feeding bin is formed in the upper shell, a feeding system is arranged in the feeding bin, the lower shell is fixed on a bottom plate, a component bin is formed in the lower shell, and a discharging system and a cooling system are arranged in the component bin.

Description

3D print head

Technical Field

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

Background

With the development of scientific technology, 3D printing technology has been applied in various fields of jewelry, footwear, industrial design, automobiles, and the like. Wherein, the 3D printer is the core equipment that 3D printed, it is based on digital model file, the mode of printing the material is sprayed through print nozzle successive layer on print platform constructs three-dimensional object, so the printer nozzle plays vital function in the 3D printer, and prior art's the ejection of compact system of printer nozzle, most structure is fairly simple, it extrudes from the shower nozzle directly to drive the material through the screw rod, and be provided with cooling device, all jam in the ejection of compact department that leads to easily, and life is short, so need carry out redesign to 3D printer nozzle.

Disclosure of Invention

According to the defects of the prior art, the invention provides a 3D printer nozzle.

In order to solve the technical problem, the 3D printer nozzle provided by the invention comprises an upper shell, a lower shell and a controller, wherein the upper shell is clamped and fixed at the upper end of the lower shell, the upper end of the upper shell is of an open structure, a top cover is detachably clamped and fixed on the open upper end surface of the upper shell, a feeding bin is formed in the upper shell, a feeding system is arranged in the feeding bin, the lower shell is fixed on a base, a component bin is formed in the lower shell, and a discharging system and a cooling system are arranged in the component bin.

Preferably, the feeding system comprises a material plate, a feeding channel and a siphon device, the material plate is downwards inclined and fixed in the upper shell, three material plates are arranged and comprise a first material plate, a second material plate and a third material plate, the lowest part of the third material plate is provided with a first feeding port, the uppermost end of the first feeding port is connected with a baffle through a hinge, the feeding port is communicated with the feeding channel, the feeding channel is arranged in the lower shell, the feeding channel is vertically downwards communicated with the discharging system, the feeding bin is internally partitioned by a middle bin, the siphon device is arranged in the middle bin, the siphon device comprises a suction fan, a suction pipeline, a suction port, an air outlet, an electromagnet and an armature, the suction fan and the suction pipeline are arranged in the middle bin, the suction port is communicated with the feeding bin, the air outlet is arranged at the position of the upper shell corresponding to the suction fan, the armature is fixed at the position, close to the hinge, of the upper end face of the baffle, when the baffle is vertically erected upwards, the electromagnet is fixed on the vertical surface of the third material plate corresponding to the armature position, and the electromagnet is electrically connected with the suction fan through the controller.

Preferably, a material level sensor is arranged in the feeding channel and comprises a discharging material level sensor and a feeding material level sensor, wherein the discharging material level sensor and the feeding material level sensor are both electrically connected with the suction fan through a controller.

Preferably, the air suction port comprises a bottom ring, a breathable filter element and an end cover, the bottom ring is fixed on the second material plate through screws, the breathable filter element is installed between the bottom ring and the end cover, and the end cover is fixed at the top of the breathable filter element.

Preferably, the discharging system comprises a motor, a connecting column, a fixing frame, a discharging pipeline, a heating device, a screw rod and a nozzle, the motor is fixed on a motor mounting plate, the lower end face of the motor mounting plate is connected with the fixing frame through the connecting column, the fixing frame is fixed on a base through screws, the discharging pipeline is fixed below the fixing frame through screws, an external thread is arranged on a cylindrical surface of one end of the discharging pipeline, which is far away from the fixing frame, the external thread is connected with the nozzle, the position of the discharging pipeline, which is close to the nozzle, is provided with the heating device, an output shaft of the motor is connected with the screw rod through a coupler, the screw rod vertically and downwards extends into the discharging pipeline, the discharging pipeline comprises a sealing cover and a discharging part, a second feeding port is arranged at the top of the discharging part, the second feeding port is in an open design with a large upper part and a small part and is communicated with a discharging port of the feeding channel, and the major diameter of a screw thread of a spiral part of the screw rod is in intermittent fit with an inner hole of the discharging pipeline, the nozzle is provided with a spray hole, and when the nozzle is completely screwed on the discharge pipeline, a gap of 3-5MM is reserved between the lower end surface of the screw and the upper end surface of the spray hole.

Preferably, the heating device comprises a left heating block and a right heating block, and the left heating block and the right heating block are arranged at the position, close to the nozzle, of the discharging pipeline.

Preferably, the cooling system comprises a rod cooling device and an end cooling device, the end cooling device comprises a sealing ring, a circulating water channel and a mounting hole, the sealing ring comprises three sealing rings which are all arranged between a sealing cover and a screw rod in a sealing mode, a first sealing water channel and a second sealing water channel are formed between the sealing ring and the sealing cover as well as between the sealing ring and the screw rod, a first connecting hole and a second connecting hole are formed in the sealing cover, the first connecting hole is communicated with the first sealing water channel, the second connecting hole is communicated with the second sealing water channel, the first sealing water channel and the second sealing water channel are communicated with the circulating water channel, the mounting hole is formed in the lower end face of the screw rod, a sealing plug is arranged in the mounting hole, a U-shaped water channel is arranged in the mounting hole, and the shaped water channel is communicated with the circulating water channel; the rod cooling device comprises a sleeve and three heat dissipation rings, wherein the heat dissipation ring positioned in the middle is provided with a communication hole, the heat dissipation ring is arranged on the outer ring of the discharge pipeline and is integrally designed with the discharge pipeline, the sleeve is sleeved and sleeved outside the heat dissipation ring, a cooling channel is formed between the sleeve and the heat dissipation ring, the cooling channel comprises an upper cooling channel and a lower cooling channel, the upper cooling channel and the lower cooling channel are communicated through the communication hole, the sleeve is provided with a water inlet and a water outlet, the water inlet is communicated with the upper cooling channel, and the water outlet is communicated with the lower cooling channel.

Preferably, connecting hole one, connecting hole two, water inlet and delivery port all are connected with cooling water tank through the pipeline, and cooling water tank is connected with circulating water pump, lower casing corresponds cooling water tank position department and opens there is the louvre, is provided with radiator fan on the louvre, radiator fan is last to have CTT copper pipe and radiating base, radiating base chooses radiating fin for use.

Preferably, the cooling system further comprises an air cooling device, the air cooling device is fixed on the base through an air cooling support, the air cooling support is fixed on the base through a first screw and a second screw, an arc groove is formed in one side, located on the second screw, of the air cooling support, the air cooling device comprises an air cooler and an air cooling cover, and an air outlet is formed in the air cooling cover.

The gain effect of the invention is as follows: the utility model discloses a 3D printer nozzle, which is provided with a feeding system, a discharging system and a cooling system, wherein the feeding system can realize the on-off of a feeding channel through a siphon device according to the amount of materials in the feeding channel, thereby realizing automatic control; the cooling system can cool the upper end of the discharge pipeline and the end part of the screw rod, reduces the occurrence of blocking phenomenon, reduces the failure rate, is additionally provided with an air cooling device at the position of the nozzle, and can cool the nozzle when the nozzle extrudes materials through the air cooling device, thereby reducing the blocking condition at the position of the nozzle.

Drawings

The invention is further illustrated with reference to the following figures and examples:

FIG. 1 is a schematic external view of the present invention;

FIG. 2 is an internal schematic view of the present invention with the upper and lower housings removed;

FIG. 3 is a schematic view of the internal structure of the feeding system of the present invention;

FIG. 4 is a schematic view of the internal structure of the middle bin of the present invention;

FIG. 5 is a partial enlarged view of the baffle of the present invention;

FIG. 6 is a schematic view of a partial structure of the discharging system of the present invention;

fig. 7 is a schematic diagram of the internal structure of the cooling system of the present invention;

FIG. 8 is an enlarged view of a portion of FIG. 7 taken at A;

FIG. 9 is an enlarged view of a portion of FIG. 7 taken at B;

FIG. 10 is an enlarged view of a portion of FIG. 7 taken at C;

in the figure: 1 upper shell, 101 air outlet, 2 lower shell, 201 heat dissipation hole, 3 top cover, 401 air suction port, 4011 end cover, 4012 air permeable filter element, 4013 bottom ring, 402 air suction pipeline, 403 suction fan, 404 armature, 405 electromagnet, 5 feeding channel, 501 feeding port I, 502 discharging port, 6 baffle, 7 level sensor, 701 feeding level sensor, 702 discharging level sensor, 8 flitch, 801 flitch I, 802 flitch II, 803 flitch III, 9 feeding bin, 10 middle bin, 11 motor, 12 motor mounting plate, 13 connection column, 14 discharging pipeline, 15 discharging part, 1501 feeding port II, 16 heating device, 1601 left heating block, 1602 right heating block, 17 nozzle, 1701 spray hole, 18 base, 1901 air cooler, cool air cover, 1903 air outlet, 20 fixing frame, 21 coupling, 22 screw, 23 sealing cover, 1902 1 connecting hole I, 1902 connection hole 2302 II, 24 air cooling bracket, 2401, 2402, 2403 circular arc grooves, 25 sealing plugs, 2501U-shaped water channels, 26 sleeves, 2601 water inlets, 2602 water outlets, 27 heat dissipation rings, 2701 upper cooling channels, 2702 lower cooling channels, 2703 communication holes, 28 sealing rings, 2901 first sealing water channels, 2902 second sealing water channels, 30 circulating water channels, 31 cooling water tanks, 32 circulating water pumps, 33 controllers, 34 element bins and 35 heat dissipation fans.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

In this embodiment, as shown in the figure, the 3D print head that this embodiment provided, including last casing 1, casing 2 and controller 33 down, go up casing 1 joint and fix the upper end at casing 2 down, the upper end of going up casing 1 is open structure, and detachable joint is fixed with top cap 3 on the open up end of last casing 1, when installing this device in the 3D printer, pull down top cap 3, be connected the open upper end of last casing 1 with the feed cylinder (not shown in the figure), the storage has the material in the feed cylinder, upward be formed with a feeding storehouse 9 in the casing 1, including feed system in the feeding storehouse 9, casing 2 is fixed on base 18 down, and is formed with a component storehouse 34 down in casing 2, is provided with discharge system and cooling system in the component storehouse 34.

The feeding system comprises a material plate 8, a feeding channel 5 and a siphon device, the material plate 8 is fixed in the upper shell 1 in a downward inclined manner and comprises a first material plate 801, a second material plate 802 and a third material plate 803, the lowest part of the third material plate 803 is provided with a first feeding port 501, the uppermost end of the first feeding port 501 is connected with a baffle 6 through a hinge, the first feeding port 501 is communicated with the feeding channel 5, the feeding channel 5 is arranged in the lower shell 2, the feeding channel 5 is vertically downward and communicated with the discharging system, the feeding bin 9 is partitioned into a middle bin 10, the siphon device is arranged in the middle bin 10 and comprises a suction fan 403, a suction pipe 402, a suction port 401, an air outlet 101, an electromagnet 405 and an armature 404, the suction fan and the suction pipe 402 are arranged in the middle bin 10, the suction fan 403 is communicated with the suction pipe 402, and the suction port 401 is opened on the inclined plane 403 of the second material plate 802, the air outlet 101 is arranged at a position of the upper shell 1 corresponding to the suction fan 403, and is used for discharging air in the air suction pipeline 402 when the suction fan 403 works, the armature 404 is fixed at a position close to the hinge on the upper end face of the baffle plate, and when the baffle plate 6 is vertically erected upwards, the electromagnet 405 is fixed at a position corresponding to the armature 404 on the vertical surface of the flitch plate three 803.

In order to realize automatic feeding and stop feeding, a material level sensor 7 is arranged in the feeding channel 5, the material level sensor 7 comprises a material discharging level sensor 702 and a material feeding level sensor 701, and the material discharging level sensor 702 and the material feeding level sensor 701 are both electrically connected with a suction fan 403 of a siphon device through a controller 33.

Further, the suction port comprises a bottom ring 4013, a breathable filter element 4012 and an end cover 4011, the bottom ring 4013 is fixed on the second flitch 802 through screws, the breathable filter element 4012 is installed between the bottom ring 4013 and the end cover 4011, the end cover 4011 is fixed at the top of the breathable filter element 4012, suction is performed through the breathable filter element 4012, and the suction fan can effectively prevent the suction fan 403 from working and suck materials in the feeding bin 9 into the suction pipeline 402 reversely.

The discharging system comprises a motor 11, a connecting column 13, a fixing frame 20, a discharging pipeline 14, a heating device 16, a screw rod 22 and a nozzle 17, wherein the motor 11 is fixed on a motor mounting plate 12, the lower end face of the motor mounting plate 12 is connected with the fixing frame 20 through the connecting column 13, the fixing frame 20 is fixed on a base 18 through screws, the discharging pipeline 14 is fixed below the fixing frame 20 through screws, an external thread is arranged on a cylindrical surface of the discharging pipeline 14 away from one end of the fixing frame 20, the nozzle 17 is connected to the external thread through a thread, the nozzle 17 is used for extruding materials, an output shaft of the motor 11 is connected with the screw rod 22 through a coupler 21, the screw rod 22 vertically extends downwards into the discharging pipeline 14, the discharging pipeline 14 comprises a sealing cover 23 and a discharging part 15, a feeding port two 1501 is arranged at the uppermost part of the discharging part 15, the feeding port two 1501 is in an open design with a large upper part and a small part and is communicated with a discharging port 502 of a feeding channel 5, the thread major diameter of the spiral part of the screw 22 is in intermittent fit with the inner hole of the discharge pipeline 14, the nozzle 17 is provided with spray holes 1701, when the nozzle 17 is completely screwed on the discharge pipeline 14, a 3-5MM gap is reserved between the lower end surface of the screw 22 and the upper end surface of the spray holes 1701, the gap is used for temporarily storing materials conveyed by the screw 22, in order to melt plastic particles, a heating device 16 is arranged at the position, close to the nozzle 17, of the discharge pipeline 14, the heating device 16 can melt the materials in the discharge pipeline 14, the heating device 16 comprises a left heating block 1601 and a right heating block 1602, and the left heating block 1601 and the right heating block 1602 are arranged at the position, close to the nozzle 17, of the discharge pipeline 14.

The cooling system comprises a rod cooling device and an end cooling device, the rod cooling device can cool the upper end of the discharge pipeline 14, and the end cooling device can cool the end of the screw 22, so that the blocking phenomenon is reduced.

The end cooling device comprises a sealing ring 28, a circulating water channel 30 and a mounting hole, wherein the sealing ring 28 comprises three sealing bodies which are hermetically arranged between a sealing cover 23 and a screw rod 22, a first sealing water channel 2901 and a second sealing water channel 2902 are formed between the sealing ring 28 and the sealing cover 23 and the screw rod 22, a first connecting hole 2301 and a second connecting hole 2302 are formed in the sealing cover 28, the first connecting hole 2301 is communicated with the first sealing water channel 2901, the second connecting hole 2302 is communicated with the second sealing water channel 2902, the first sealing water channel 2901 and the second sealing water channel 2902 are communicated with the circulating water channel 30, the mounting hole is formed in the lower end face of the screw rod 22, a sealing plug 25 is arranged in the mounting hole, a U-shaped water channel 2501 is arranged in the mounting hole 25, and the U-shaped water channel 2501 is communicated with the circulating water channel 30.

The rod cooling device comprises a sleeve 26 and three heat dissipation rings 27, the heat dissipation rings 27 are three, a communication hole 2703 is formed in the heat dissipation ring 27 in the middle, the heat dissipation ring 27 is arranged on the outer ring of the discharge pipeline 14 and is integrally designed with the discharge pipeline 14, the sleeve 26 is hermetically sleeved on the outer side of the heat dissipation ring 27, a cooling channel is formed between the sleeve 26 and the heat dissipation ring 27, the cooling channel comprises an upper cooling channel 2701 and a lower cooling channel 2702, the upper cooling channel 2701 is communicated with the lower cooling channel 2702 through the communication hole 2703, a water inlet 2601 and a water outlet 2602 are formed in the sleeve 26, the water inlet 2601 is communicated with the upper cooling channel 2701, and the water outlet 2602 is communicated with the lower cooling channel 2702.

The first connecting hole 2301, the second connecting hole 2302, the water inlet 2601 and the water outlet 2602 are all connected with the cooling water tank 31 through pipelines, the cooling water tank 31 is connected with the circulating water pump 32, and the cooling water tank 31 and the circulating water pump 32 can provide continuous cooling water for the end cooling device and the rod cooling device.

Further, cooling system still includes the air cooling device, and the air cooling device passes through air-cooled support 24 to be fixed on base 18, and the air cooling device package air-cooler 1901 and cold wind cover 1902, it has air outlet 1903 to open on the cold wind cover 1902, through the air cooling device setting, when nozzle 17 extrudes the material, can cool off nozzle 17, has reduced that nozzle 17 position department blocks up the condition and appears, but the material that nozzle 17 department extruded in addition still can cool off, reach the quick refrigerated effect after the material is extruded, has improved production efficiency.

Further, in order to adjust the angle of the air outlet 1903, the air-cooled bracket 24 of this embodiment is fixed on the base 18 by a first screw 2401 and a second screw 2402, an arc groove 2403 is formed on one side of the air-cooled bracket 24, which is located on the second screw 2402, and the air-cooled bracket 24 can rotate around the first screw 2401 by the design of the arc groove 2403, thereby completing the angle adjustment of the air outlet 2403.

The working process is as follows: when the device works, firstly the top cover 3 of the device is taken down, when the device is installed in a 3D printer, the open upper end of the upper shell 1 is connected with an external charging barrel which is used for supplying materials, when the lower material level sensor 702 detects that the materials in the feeding channel 5 are lower than the lower material level sensor 702, the suction fan 403 can be automatically started and the electromagnet 405 is controlled to be electrified, the suction fan 403 works to suck the baffle 6 through the action of air pressure, the baffle 6 is vertically erected upwards, at the moment, the suction fan 403 stops working, the electromagnet 405 is electrified to attract the armature 404, the baffle is kept in a vertical state, at the moment, the feeding channel 5 is opened, the materials are fed from the external charging barrel, the materials enter the feeding bin 9, then enter the feeding channel 5 from the feeding bin 9, finally enter the discharging pipeline from the discharging port of the feeding channel for discharging, the feeding process is finished, when the material level sensor 701 detects that the materials in the feeding channel 5 are higher than the upper material level sensor 701, and controlling the electromagnet 405 to be powered off, releasing the armature 404 by the electromagnet 405, and covering the baffle 6 above the feeding channel 5 again due to the influence of gravity and the thrust of the material on the third material plate 803 by the baffle 6 to finish the feeding stopping process.

During discharging, the motor 11 works and rotates to drive the screw rod 22 to rotate, the screw rod 22 rotates to drive the plastic particles in the feeding channel 5 to be conveyed into the discharging pipeline 14 through the spiral groove on the screw rod 22, and when the plastic particles pass through the heating device 16, the plastic particles are heated and melted by the heating device 16 and are sprayed out from the spray hole 1701 of the nozzle 17, so that the discharging process is completed.

When discharging, the cooling system also works synchronously, the cooling water in the cooling water tank 31 is driven by the circulating water pump 32 to enter the rod cooling device and the end cooling device, wherein the rod cooling device, i.e. the cooling water, enters the upper cooling channel 2701 through the water inlet 2601, then enters the lower cooling channel 2702 through the communication hole 2703, and finally returns to the cooling water tank 31 again through the water outlet 2602; the cooling device at the end part, namely cooling water, enters the first sealed water channel 2901 through the first connecting hole 2301, then enters the right circulating water channel 30 from the first sealed water channel 2901, the right circulating water channel 30 is communicated with the U-shaped water channel 2501, the end part of the screw rod 22 can be cooled through the U-shaped water channel 2501, the cooled cooling water enters the second sealed water channel 2902 through the left circulating water channel 30, and finally returns to the cooling water tank 31 through the second connecting hole 2302, and the cooling process is completed.

While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a 3D print head which characterized in that: including last casing (1), casing (2) and controller (33) down, go up the upper end that casing (1) joint was fixed casing (2) down, the upper end of going up casing (1) is open structure, and detachable joint is fixed with top cap (3) on the open up end of last casing (1), goes up and is formed with a feeding storehouse (9) in casing (1), including feeding system in feeding storehouse (9), and lower casing (2) are fixed on base (18), and are formed with a component storehouse (34) in casing (2) down, are provided with discharge system and cooling system in component storehouse (34).

2. The 3D printer head of claim 1, wherein: the feeding system comprises a material plate (8), a feeding channel (5) and a siphon device, wherein the material plate (8) is downwards inclined and fixed in an upper shell (1), the material plate (8) is provided with three parts comprising a first material plate (801), a second material plate (802) and a third material plate (803), the lowest part of the third material plate (803) is provided with a first feeding hole (501), the uppermost end of the first feeding hole (501) is connected with a baffle (6) through a hinge, the first feeding hole (501) is communicated with the feeding channel (5), the feeding channel (5) is arranged in a lower shell (2), the feeding channel (5) vertically downwards is communicated with a discharging system, a middle bin (10) is separated in a feeding bin (9), the siphon device is arranged in the middle bin (10), and the siphon device comprises a suction fan (403), a suction pipeline (402), an air suction port (401), an air outlet (101), an electromagnet (405) and an armature (404), suction fan (403) and suction pipe (402) set up in middle storehouse (10), and suction fan (403) are linked together with suction pipe (402), suction port (401) are linked together with feeding storehouse (9), gas outlet (101) are seted up and are corresponded suction fan (403) position department in last casing (1), armature (404) are fixed and are close to hinge position department at baffle (6) up end, and when baffle (6) upwards erected perpendicularly, electro-magnet (405) are fixed in and correspond armature (404) position department on the vertical face of flitch three (803), electro-magnet (405) are through controller (33) and suction fan (403) electric connection.

3. The 3D printer head of claim 2, wherein: be provided with material level sensor (7) in charge channel (5), material level sensor (7) are including unloading material level sensor (702) and last material level sensor (701), material level sensor (702) and last material level sensor (701) are all through controller (33) and suction fan (403) electric connection down.

4. The 3D printer head of claim 2, wherein: suction port (401) are including foundation ring (4013), ventilative filter core (4012) and end cover (4011), foundation ring (4013) are fixed on flitch two (802) through the screw, and ventilative filter core (4012) are installed between foundation ring (4013) and end cover (4011), the top at ventilative filter core (4012) is fixed in end cover (4011).

5. The 3D printer head of claim 1, wherein: the discharging system comprises a motor (11), a connecting column (13), a fixing frame (20), a discharging pipeline (14), a heating device (16), a screw rod (22) and a nozzle (17), wherein the motor (11) is fixed on a motor mounting plate (12), the lower end face of the motor mounting plate (12) is connected with the fixing frame (20) through the connecting column (13), the fixing frame (20) is fixed on a base (18) through screws, the discharging pipeline (14) is fixed below the fixing frame (20) through the screws, an external thread is arranged on a cylindrical surface of one end of the discharging pipeline (14) far away from the fixing frame (20), the nozzle (17) is in threaded connection with the external thread, the heating device (16) is arranged at a position, close to the nozzle (17), of the discharging pipeline (14), an output shaft of the motor (11) is connected with the screw rod (22) through a coupler (21), and the screw rod (22) vertically and downwards, discharge duct (14) are including sealed cowling (23) and ejection of compact portion (15), and feed inlet two (1501) have been seted up to the top of ejection of compact portion (15), and feed inlet two (1501) are big-end-up's open design, and are linked together with discharge gate (502) of feedstock channel (5), the screw thread major diameter of the spiral portion of screw rod (22) adopts intermittent type cooperation with discharge duct (14) hole, it has orifice (1701) to open on nozzle (17), when nozzle (17) are screwed completely on discharge duct (14), leaves 3-5 MM's clearance between screw rod (22) lower terminal surface and the up end of orifice (1701).

6. The 3D printer head of claim 5, wherein: the heating device (16) comprises a left heating block (1601) and a right heating block (1602), wherein the left heating block (1601) and the right heating block (1602) are arranged at the position, close to the nozzle (17), of the discharging pipeline (14).

7. The 3D printer head of claim 5, wherein: the cooling system comprises a rod cooling device and an end cooling device, the end cooling device comprises a sealing ring (28), a circulating water channel (30) and a mounting hole, the sealing ring (28) comprises three sealing rings which are hermetically mounted between a sealing cover (23) and a screw rod (22), a first sealing water channel (2901) and a second sealing water channel (2902) are formed between the sealing ring (28) and the sealing cover (23) as well as between the screw rod (22), the sealing cover (23) is provided with a first connecting hole (2301) and a second connecting hole (2302), the first connecting hole (2301) is communicated with the first sealing water channel (2901), the second connecting hole (2302) is communicated with the second sealing water channel (2902), the first sealing water channel (2901) and the second sealing water channel (2902) are communicated with the circulating water channel (30), the mounting hole is formed in the lower end face of the screw rod (22), a sealing plug (25) is arranged in the mounting hole, and a U-shaped water channel (2501) is arranged in the sealing plug (25), the U-shaped water channel (2501) is communicated with the circulating water channel (30); the rod cooling device comprises a sleeve (26) and a heat dissipation ring (27), the heat dissipation ring (27) comprises three heat dissipation rings, communication holes (2703) are formed in the heat dissipation ring (27) located in the middle, the heat dissipation ring (27) is arranged on the outer ring of the discharge pipeline (14) and the discharge pipeline (14) in an integrated design, the sleeve (26) is hermetically installed on the outer side of the heat dissipation ring (27), a cooling channel is formed between the sleeve (26) and the heat dissipation ring (27), the cooling channel comprises an upper cooling channel (2701) and a lower cooling channel (2702), the upper cooling channel (2701) and the lower cooling channel (2702) are communicated through the communication holes (2703), a water inlet (2601) and a water outlet (2602) are formed in the sleeve (26), the water inlet (2601) is communicated with the upper cooling channel (2701), and the water outlet (2602) is communicated with the lower cooling channel (2702).

8. The 3D printer head of claim 7, wherein: connecting hole one (2301), connecting hole two (2302), water inlet (2601) and delivery port (2602) all are connected with cooling water tank (31) through the pipeline, and cooling water tank (31) are connected with circulating water pump (32), casing (2) are opened to correspond cooling water tank (31) position department down has louvre (201), is provided with radiator fan (35) on louvre (201), radiator fan (35) are last to have CTT copper pipe and radiating base, radiating base chooses for use radiating fin.

9. The 3D printer head of claim 7, wherein: the cooling system further comprises an air cooling device, the air cooling device is fixed on the base (18) through an air cooling support (24), the air cooling support (24) is fixed on the base (18) through a first screw (2401) and a second screw (2402), an arc groove (2403) is formed in one side, located on the second screw (2402), of the air cooling support (24), the air cooling device comprises an air cooler (1901) and an air cooling cover (1902), and an air outlet (1903) is formed in the air cooling cover (1902).