CN116533516A - 3D printer nozzle and 3D printing equipment - Google Patents

Abstract

The invention discloses a 3D printer nozzle and 3D printing equipment. The 3D printer nozzle comprises a nozzle assembly, wherein the nozzle assembly comprises a feeding pipe, a sliding sleeve and a barrel which are sleeved in sequence from inside to outside, a material conveying channel is formed in the feeding pipe, the sliding sleeve and the barrel, and a discharging hole is formed in the side wall of the barrel; the sliding sleeve slides between the feeding pipe and the cylinder body and has a first state and a second state; in the first state, the discharge port is communicated with the material conveying channel, and the discharge port of the material conveying channel is closed; in the second state, the material conveying channel is separated from the discharge hole, and the discharge hole of the material conveying channel is opened. The invention can solve the problem that the taper of the material extruded from the nozzle firstly in the existing 3D printing process affects the size of the product.

Description

3D printer nozzle and 3D printing equipment

Technical Field

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

Background

The processing cost of the 3D printing technology is not obviously increased or not increased along with the complexity of the product, which is the most outstanding advantage compared with the traditional manufacturing technology, and the 3D printing technology has the advantages of short processing period, material saving and the like, so that the 3D printing technology is widely applied to the manufacture of single-piece small-batch customized products. The material extrusion 3D printing is an important direction, and the high polymer material is plasticized by an extruder, extruded from a nozzle at a certain pressure and speed, sprayed on the printing surface, and paved layer by layer along with the movement of a frame to pile up parts or products.

In the process of manufacturing the polymer material extrusion 3D printing additive, the material extruded from the extrusion nozzle firstly presents taper, the size of the material can reach the required size and tends to be stable after a short period of time, the tapered material can cause the size of the product to be affected, and the former material is cleaned by manpower at present, but the operation is time-consuming and labor-consuming.

In view of this, it is necessary to propose a 3D printer nozzle and a 3D printing apparatus to solve the above-mentioned drawbacks.

Disclosure of Invention

The invention mainly aims to provide a 3D printer nozzle and 3D printing equipment, and aims to solve the problem that the size of a product is affected by taper of a material extruded from the nozzle in the prior 3D printing process.

In order to achieve the above purpose, the invention provides a 3D printer nozzle, which comprises a nozzle assembly, wherein the nozzle assembly comprises a feeding pipe, a sliding sleeve and a barrel which are sleeved in sequence from inside to outside, a material conveying channel is formed in the feeding pipe, the sliding sleeve and the barrel, and a discharging port is formed in the side wall of the barrel; the sliding sleeve slides between the feeding pipe and the cylinder body and is provided with a first state and a second state; in the first state, the discharge port is communicated with the material conveying channel, and the discharge port of the material conveying channel is closed; in the second state, the material conveying channel is separated from the discharge port, and the discharge port of the material conveying channel is opened.

Preferably, the outer wall of the sliding sleeve is matched with the inner wall of the cylinder body to form a cavity, and the cavity is provided with two communication states along with the sliding of the sliding sleeve; in a first communication state, the cavity is communicated with the discharge port, and the cavity is separated from the discharge port; and in a second communication state, the cavity is communicated with the discharge port, and the cavity is separated from the discharge port.

Preferably, a stop piece is arranged in the cavity, the stop piece is sleeved on the outer wall of the sliding sleeve, a first material channel and a second material channel are arranged in the sliding sleeve, a first through hole is formed in the sliding sleeve along the radial direction, the first end of the first material channel is communicated with a feed inlet of the material conveying channel, and the second end of the first material channel is communicated with the cavity through the first through hole; the sliding sleeve is provided with a second through hole along the radial direction, the first end of the second material channel is communicated with the cavity through the second through hole, and the second end of the second material channel is communicated with the discharge hole of the material conveying channel; the stop piece slides along with the sliding sleeve to block the second through hole in the first communication state, and the cavity is separated from the discharge hole; and the cavity is communicated with the discharge hole.

Preferably, the stop piece is in a cylinder arrangement, the outer wall of the stop piece is propped against the inner wall of the cylinder body, and the inner wall of the stop piece is matched with the outer wall of the sliding sleeve.

Preferably, the outer surface of the sliding sleeve, which is used for forming the cavity with the inner side wall of the cylinder, is provided with a communication channel communicated with the outer side wall of the sliding sleeve, and a discharge hole is formed; the sliding sleeve is in the first communication state, so that the discharge hole slides to be arranged opposite to the discharge hole, and the cavity is communicated with the discharge hole; and under the second communication state, the sliding sleeve enables the outer side wall of the sliding sleeve to slide to be opposite to the discharge opening, so that the outer side wall of the sliding sleeve seals the discharge opening.

Preferably, the sliding sleeve comprises a cone section and a cylinder section, the cone section is arranged close to the discharge hole, the outer side wall of the cone section close to the discharge hole is matched with the inner wall of the discharge hole, and the second material channel is arranged in the cone section; the stop piece is sleeved on the outer wall of the cone section, a through hole penetrating through the other end face of the stop piece is formed in one end face of the stop piece, and a discharge hole of the material conveying channel is provided with two extrusion states along with the sliding of the sliding sleeve; in a first extrusion state, the stop piece avoids the second through hole, the cone section partially stretches into the discharge hole, materials are extruded from the extrusion hole of the second material channel, and the outer side wall of the sliding sleeve seals the discharge hole; in a second extrusion state, the stop piece avoids the second through hole, the cone section is drawn out from the discharge hole and positioned in the cavity, materials are extruded from the discharge hole from the second material channel through the cavity or directly through the cavity, and the outer side wall of the sliding sleeve seals the discharge hole.

Preferably, the outer wall of the cone section is matched with the inner wall of the cylinder body to form the cavity, the outer wall of the cylinder section is matched with the inner wall of the cylinder body, the first material channel is arranged in the cylinder section, and the first through hole is arranged on the outer wall of the cone section.

Preferably, a discharging connector is arranged at the discharging opening, and the discharging connector is communicated with the discharging opening.

Preferably, the 3D printer nozzle further comprises a driving member, and one end of the sliding sleeve, which is close to the feeding pipe, is connected to the driving end of the driving member.

The invention also proposes a 3D printing device comprising a 3D printer nozzle as described above.

Compared with the prior art, the 3D printer nozzle and the 3D printing equipment provided by the invention have the following beneficial effects:

according to the technical scheme, a discharge hole is formed in a cylinder, before printing, a machine is started, a sliding sleeve is in a first state, a discharge hole is closed, the discharge hole is communicated with a material conveying channel, materials are discharged from the discharge hole, tapered materials are discharged first, equipment is in an idling state when 3D printing is not performed, and the materials are in a moving state in the material conveying channel; when printing is needed, the sliding sleeve is in a second state, the discharge port is separated from the material conveying channel, the discharge port is opened, then the material is extruded from the discharge port, the equipment is switched from an idling state to a printing state, the material extruded from the discharge port has no taper, the size can meet the requirement, the material is always in a moving state, the material extrusion is stable, and the process control and the product quality guarantee are facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of a nozzle of a 3D printer according to an embodiment of the present invention;

FIG. 2 is a front view of an embodiment of a 3D printer nozzle according to the present invention;

FIG. 3 is a side view of one embodiment of a 3D printer nozzle of the present invention;

FIG. 4 is a top view of one embodiment of a 3D printer nozzle of the present invention;

FIG. 5 is a cross-sectional view taken along line A-A of the 3D printer nozzle of FIG. 2 in a first communication state;

FIG. 6 is a cross-sectional view taken along B-B of the 3D printer nozzle of FIG. 3 in a first communication state;

FIG. 7 is a schematic view of the structure of FIG. 5 in a first extrusion state;

FIG. 8 is a schematic view of the structure of FIG. 6 in a first extrusion state;

FIG. 9 is a schematic view of the structure of FIG. 5 in a second extrusion state;

fig. 10 is a schematic structural view of fig. 6 in a second extrusion state.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				100	3D printer nozzle	132	Cavity body
1	Nozzle assembly	14	Material conveying channel
				11	Feeding pipe	141	Discharge port
12	Sliding sleeve	15	Stop piece
				121	First material channel	16	Discharging joint
122	First through hole	17	Lip plate
				123	Second material passage	2	Driving piece
124	Second through hole	21	Turbine straight line push rod mechanism
				125	Communication channel	22	Motor with a motor housing
1251	Discharging hole	23	Connecting frame
				126	Cone section	24	Sensor protection tube
127	Cylinder segment	25	Limit switch
				13	Barrel body	26	Linear displacement sensor
131	Discharge outlet

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

Referring to fig. 1-10, the present invention proposes a 3D printer nozzle 100, where the 3D printer nozzle 100 includes a nozzle assembly 1, the nozzle assembly 1 includes a feeding pipe 11, a sliding sleeve 12, and a cylinder 13, which are sequentially sleeved from inside to outside, a material conveying channel 14 is formed inside the feeding pipe 11, the sliding sleeve 12, and the cylinder 13, and a discharge port 131 is formed on a side wall of the cylinder 13; the sliding sleeve 12 slides between the feeding pipe 11 and the cylinder 13 and has a first state and a second state; in the first state, the discharge port 131 is communicated with the material conveying channel 14, and the discharge port 141 of the material conveying channel 14 is closed; in the second state, the material conveying channel 14 is blocked from the material outlet 131, and the material outlet 141 of the material conveying channel 14 is opened.

Specifically, the nozzle assembly 1 comprises a feeding pipe 11, a sliding sleeve 12 and a barrel 13 which are sleeved in sequence from inside to outside, wherein the feeding pipe 11 is arranged in an inner hole of the barrel 13 and partially extends into the sliding sleeve 12, the sliding sleeve 12 is arranged between the feeding pipe 11 and the barrel 13, and the sliding sleeve 12 can axially slide in the barrel 13 along the outer side wall of the feeding pipe 11. The inside of inlet pipe 11, sliding sleeve 12 and barrel 13 has seted up the passageway in proper order to the intercommunication forms material conveying channel 14, and the material gets into by inlet pipe 11 department, and through sliding sleeve 12, is discharged by barrel 13 department at last, and bin outlet 131 has been seted up to barrel 13's lateral wall, and bin outlet 131 is used for carrying out the discharge to the material of material conveying channel 14.

The sliding sleeve 12 can slide between the feeding pipe 11 and the cylinder 13 and has a first state and a second state, in the first state, the discharge port 131 is communicated with the material conveying channel 14, at this time, the discharge port 141 of the material conveying channel 14 is kept closed, and the material passes through the material conveying channel 14 and is discharged from the discharge port 131, so that the material is kept in a discharging motion state, and the device is in an idle state when 3D printing is not performed.

In the second state, the material conveying passage 14 is blocked from the discharge port 131, and the discharge port 141 of the material conveying passage 14 is opened, and the material passes through the material conveying passage 14, is discharged from the discharge port 141, and is 3D printed, and is switched from the idle state to the printing state.

Before printing, the tapered material is discharged under the first state, the equipment is kept in an idle state, when printing is needed, the equipment is quickly switched to the second state, the discharge port 131 is closed, and the material is extruded from the discharge port 141 for 3D printing.

It should be understood that in the process of manufacturing the polymer material extrusion 3D printing additive, the material flows out of the extrusion nozzle when the printing is started, the speed is increased from zero to the speed value required by extrusion, and the shorter the time, namely the shorter the response time, the more beneficial to process control and product quality guarantee. The invention can enable the device to be in an idle state when the 3D printing is not performed, and the material is discharged from the discharge port 131. When 3D printing operation is needed, the discharge hole 131 is closed, the material is extruded from the discharge hole 141, the idle state is switched to the printing state, the material extrusion is more stable, no taper exists, and the size can meet the requirement. When 3D printing is stopped, the discharge opening 131 is opened, materials can be discharged from the discharge opening 131, redundant materials cannot be discharged from the extrusion nozzle, and then accurate printing is achieved.

According to the technical scheme, before printing, a discharge hole 131 is formed in a cylinder 13, a machine is started, a sliding sleeve 12 is in a first state, a discharge hole 141 is closed, the discharge hole 131 is communicated with a material conveying channel 14, materials are discharged from the discharge hole 131, tapered materials are discharged first, equipment is in an idle state when 3D printing is not performed, and the materials are in a moving state in the material conveying channel 14; when printing is needed, the sliding sleeve 12 is in the second state, the discharge hole 131 is separated from the material conveying channel 14, the discharge hole 141 is opened, then the material is extruded from the discharge hole 141, the equipment is switched from the idle state to the printing state, the material extruded from the discharge hole 141 has no taper, the size can meet the requirement, the material is always in the motion state, the material extrusion is stable, and the process control and the product quality guarantee are facilitated

As a preferred embodiment of the present invention, the outer wall of the sliding sleeve 12 and the inner wall of the cylinder 13 cooperate to form a cavity 132, and the cavity 132 has two communication states along with the sliding of the sliding sleeve 12; in the first communication state, the cavity 132 is communicated with the discharge port 131, and the cavity 132 is separated from the discharge port 141; in the second communication state, the cavity 132 is in communication with the discharge port 141, and the cavity 132 is isolated from the discharge port 131.

Specifically, a cavity 132 is provided in the cylinder 13, and the cavity 132 is specifically formed by matching an outer wall of the sliding sleeve 12 near the discharge hole 141 with an inner wall corresponding to the cylinder 13. The cavity 132 has two communication states along with the sliding of the sliding sleeve 12, and in the first communication state, the cavity 132 is separated from the discharge hole 141, the cavity 132 is communicated with the discharge hole 131, the cavity 132 is communicated with the material conveying channel 14, and the material in the material conveying channel 14 passes through the cavity 132 and is discharged from the discharge hole 131.

In the second communication state, the cavity 132 is communicated with the discharge port 141 of the material conveying channel 14, the cavity 132 is separated from the discharge port 131, that is, the second state is switched, and the material is conveyed from the material conveying channel 14 to the cavity 132 and discharged from the discharge port 141 for 3D printing.

By arranging the cavity 132, the cavity 132 is conveniently communicated or cut off with the discharge port 141 of the material conveying channel 14 along with the sliding of the sliding sleeve 12, and is conveniently separated or communicated with the discharge port 131, so that the material conveying is conveniently performed through the cavity 132.

As a preferred embodiment of the present invention, a stopper 15 is disposed in the cavity 132, the stopper 15 is sleeved on the outer wall of the sliding sleeve 12, a first material channel 121 and a second material channel 123 are disposed in the sliding sleeve 12, a first through hole 122 is formed in the sliding sleeve 12 along a radial direction, a first end of the first material channel 121 is communicated with a feed inlet of the material conveying channel 14, and a second end of the first material channel 121 is communicated with the cavity 132 through the first through hole 122; the sliding sleeve 12 is provided with a second through hole 124 along the radial direction, a first end of the second material channel 123 is communicated with the cavity 132 through the second through hole 124, and a second end of the second material channel 123 is communicated with a discharge port 141 of the material conveying channel 14; the stopper 15 slides along with the sliding sleeve 12 to block the second through hole 124 in the first communicating state, and the cavity 132 is blocked from the discharge port 141; and in the second communication state, the second through hole 124 is avoided, and the cavity 132 is communicated with the discharge port 141.

In detail, as shown in fig. 5 to 10, a first material channel 121 and a second material channel 123 are arranged in the sliding sleeve 12 at intervals, a first end of the first material channel 121 is communicated with a feed inlet of the material conveying channel 14, a second end of the first material channel 121 is communicated with the cavity 132 through a first through hole 122, and the first through hole 122 can be a hole formed in one side of the sliding sleeve 12; or may be a through hole penetrating through the outer side wall of the sliding sleeve 12, so that the material may flow out along the through holes on two sides of the first material channel 121.

The first end of the second material channel 123 is communicated with the cavity 132 through the second through hole 124, so that the second material channel 123 is communicated with the first material channel 121 through the cavity 132, and the second through hole 124 can be a hole formed along one side of the sliding sleeve 12; or may be a through hole penetrating through the outer sidewall of the sliding sleeve 12, so that the material may enter the second material channel 123 through the through holes on both sides.

The material enters the first material channel 121 from the feeding hole through the feeding pipe 11, flows out from the first through hole 122 to the cavity 132, enters the second through hole 124 from the cavity 132 and is extruded from the discharging hole 141, or directly enters the discharging hole 141 from the cavity 132 for extrusion.

It should be noted that, the stopper 15 is disposed in the cavity 132 and sleeved on the outer wall of the sliding sleeve 12, and the stopper 15 is matched with the sliding of the sliding sleeve 12 to block the second through hole 124 in the first communicating state, so that the material cannot be discharged from the discharge hole 141 of the material conveying channel 14, but only from the discharge hole 131; in the second communication state, the stopper 15 avoids the second through hole 124, so that the material in the cavity 132 is extruded from the discharge hole 141 through the second material channel 123 or directly extruded from the discharge hole 141 of the material conveying channel 14.

In an embodiment, the end surface of the stopper 15 is in a closed type, the stopper 15 cuts off the material in the cavity 132 from the discharge port 141, and when the stopper 15 seals the second through hole 124, the material cannot be extruded from the cavity 132 or the second through hole 124 to the discharge port 141. In another embodiment, the end surface of the stop member 15 is provided with a through hole for passing the material, the material in the cavity 132 can be extruded toward the discharge port 141 through the through hole on the stop member 15, at this time, when the stop member 15 seals the second through hole 124, one end of the sliding sleeve 12 close to the discharge port 141 is left with a preset length, so that the sliding sleeve can extend into the discharge port 141 of the material conveying channel 14, and is attached to the inner wall of the discharge port 141, so as to block the discharge port 141 and prevent the material from being extruded from the discharge port 141.

By providing the stopper 15 and setting the passage inside the slide sleeve 12 as two passages, a better fit with the cavity 132 can be made to better perform switching between the first communication state and the second communication state.

Further, the stop member 15 is disposed in a cylinder, the outer wall of the stop member 15 abuts against the inner wall of the cylinder 13, and the inner wall of the stop member 15 is matched with the outer wall of the sliding sleeve 12.

It is worth noting that the stop piece 15 is in a cylindrical arrangement, the outer wall of the stop piece 15 abuts against the inner wall of the cylinder 13, so that the stop piece 15 is fixed on the cylinder 13, the inner wall of the stop piece 15 is matched with the outer wall of the sliding sleeve 12, the inner wall of the stop piece 15 slides along with the sliding sleeve 12 to block or avoid the second through hole 124, and the structure is simple and practical, and the disassembly and assembly are convenient.

As a preferred embodiment of the present invention, the outer surface of the sliding sleeve 12, which is used to form the cavity 132 with the inner side wall of the cylinder 13, is provided with a communication channel 125 that is communicated with the outer side wall of the sliding sleeve 12, and forms a discharge hole 1251; in the first communication state, the sliding sleeve 12 slides the discharge hole 1251 to be opposite to the discharge hole 131, so that the cavity 132 is communicated with the discharge hole 131; in the second communication state, the sliding sleeve 12 slides the outer sidewall of the sliding sleeve 12 to be opposite to the discharge opening 131, so that the discharge opening 131 is blocked by the outer sidewall of the sliding sleeve 12.

Specifically, as shown in fig. 6, 8 and 10, a communication channel 125 is formed on the outer surface of the inner side wall of the sliding sleeve 12, which is used for forming a cavity 132 with the inner side wall of the cylinder 13, the communication channel 125 is arranged towards the feeding pipe 11, the communication channel 125 is communicated to the outer side wall of the sliding sleeve 12, that is, a discharging hole 1251 is formed at a corresponding position of the communication channel 125 of the sliding sleeve 12, so as to be used for discharging corresponding to the discharging hole 131.

In the first communication state, the sliding sleeve 12 slides to enable the discharge hole 1251 on the communication channel 125 to be opposite to the discharge hole 131, so that the cavity 132 is communicated with the discharge hole 131, and materials are discharged from the cavity 132 through the discharge hole 1251 and from the discharge hole 131; in the second communication state, the sliding sleeve 12 slides to enable the outer side wall around the discharge hole 1251 to slide to be opposite to the discharge hole 131, so that the outer side wall of the sliding sleeve 12 can seal the discharge hole 131, and the material is extruded from the discharge hole 141 of the material conveying channel 14.

As a preferred embodiment of the present invention, the sliding sleeve 12 includes a cone section 126 and a cylinder section 127, the cone section 126 is disposed near the discharge port 141, an outer side wall of the cone section 126 near the discharge port 141 is adapted to an inner wall of the discharge port 141, and the second material channel 123 is disposed inside the cone section 126; the stop piece 15 is sleeved on the outer wall of the cone section 126, a through hole penetrating through the other end face of the stop piece 15 is formed in one end face of the stop piece, and a discharge hole 141 of the material conveying channel 14 has two extrusion states along with the sliding of the sliding sleeve 12; in the first extrusion state, the stop member 15 is away from the second through hole 124, the cone section 126 partially extends into the discharge hole 141, the material is extruded from the extrusion hole of the second material channel 123, and the outer side wall of the sliding sleeve 12 seals the discharge hole 131; in the second extrusion state, the stop member 15 is retracted from the second through hole 124, the cone section 126 is drawn out from the discharge hole 141 and positioned inside the cavity 132, the material is extruded from the discharge hole 141 through the cavity 132 or directly through the cavity 132 from the second material channel 123, and the outer side wall of the sliding sleeve 12 seals the discharge hole 131.

In detail, the sliding sleeve 12 includes a cone section 126 and a cylinder section 127, an outer side wall of the cone section 126, which is close to the discharge port 141, is adapted to an inner wall of the discharge port 141 so as to extend into the discharge port 141, the second material channel 123 is disposed in the cone section 126, the stop member 15 is sleeved on an outer wall of the cone section 126, and a through hole is disposed on an end surface of the stop member 15 so as to allow the material to pass through the cavity 132.

As shown in fig. 7-8, the discharge port 141 of the material conveying channel 14 has two extrusion states along with the sliding of the sliding sleeve 12, in the first extrusion state, the stop member 15 avoids the second through hole 124, the outer side wall of the sliding sleeve 12 seals the discharge port 131, the cone section 126 partially extends into the discharge port 141, the end surface of the cone section is flush with the outer end surface of the discharge port 141, and the material enters the second material channel 123 from the cavity 132 along the second through hole 124 and is extruded from the extrusion port of the second material channel 123, i.e. the small-caliber extrusion state.

Referring to fig. 9-10, in the second extrusion state, the stopper 15 avoids the second through hole 124, the outer side wall of the sliding sleeve 12 seals the discharge hole 131, the cone section 126 is drawn out from the discharge hole 141 and located in the cavity 132, and the material enters the cavity 132 from the first through hole 122 of the first material channel 121 and reaches the discharge hole 141 through the second material channel 123 or directly reaches the discharge hole 141 from the cavity 132 to be extruded, i.e. the large-caliber extrusion state.

In addition, in the present embodiment, the second through hole 124 is located on the side of the stopper 15 near the discharge port 141 when in the first extrusion state, and the second through hole 124 is located on the side of the stopper 15 near the feed port when in the second extrusion state.

Therefore, the technical scheme of the invention can change the extrusion caliber of the nozzle, so that the 3D printing process has more selectivity, namely three extrusion states are selected in the process of manufacturing the high polymer material extrusion 3D printing additive, namely a large caliber extrusion state, a small caliber extrusion state and a discharge state. During the 3D material-increasing printing process, the large-caliber extrusion state can be selected for printing at the part with low appearance requirement so as to improve efficiency, the small-caliber extrusion state can be selected for printing at the part with higher surface requirement so as to realize fine printing, and the discharging state is used for starting and stopping 3D printing, so that the efficiency, printing precision and product surface quality of 3D printing are better considered.

As a preferred embodiment of the present invention, the outer wall of the cone section 126 is matched with the inner wall of the cylinder 13 to form the cavity 132, the outer wall of the cylinder section 127 is matched with the inner wall of the cylinder 13, the first material channel 121 is disposed in the cylinder section 127, and the first through hole 122 is disposed in the outer wall of the cone section 126.

It should be understood that the outer wall of the cone section 126 of the sliding sleeve 12 is matched with the inner wall of the cylinder 13 to form the cavity 132, the outer wall of the cylinder section 127 is matched with the inner wall of the cylinder 13, and the first through hole 122 is extended from the outer wall of the cone section 126, so that materials can directly enter the cavity 132.

In this embodiment, the cone section 126 includes an extrusion section, a matching section and a transition section that are sequentially set, the outer wall of the extrusion section is cooperatively set with the inner wall of the discharge port 141, the stop member 15 is sleeved on the matching section, and the outer surface of the transition section is provided with the communication channel 125.

As a preferred embodiment of the present invention, the discharge port 131 is provided with a discharge joint 16, and the discharge joint 16 is in communication with the discharge port 131.

In detail, a discharge joint 16 is disposed at the discharge port 131, and the discharge joint 16 is communicated with the discharge port 131, and the discharge joint 16 is disposed, which can be used for controlling a material discharge switch and controlling a flow rate of discharged material.

In one embodiment, the nozzle assembly 1 further comprises a lip plate 17, the lip plate 17 being connected to the end of the bowl 13 remote from the feed tube 11, the cone 126 extending partially into the lip plate 17, the lip plate 17 being provided with a discharge opening 141.

Further, the 3D printer nozzle 100 further includes a driving member 2, and an end of the sliding sleeve 12 adjacent to the feeding pipe 11 is connected to a driving end of the driving member 2.

It should be noted that, one end of the sliding sleeve 12 near the feeding pipe 11 is connected to the driving end of the driving member 2, the driving member 2 is used for driving the sliding sleeve 12, and the driving member 2 is used for driving the sliding sleeve 12 to slide so as to rapidly switch between the first state and the second state.

The driving member 2 may take different forms according to actual needs, in this embodiment, the driving member 2 includes a motor 22 and a turbine linear push rod mechanism 21, the driving end of the turbine linear push rod mechanism 21 is connected to the sliding sleeve 12, and the motor 22 drives the turbine linear push rod mechanism 21 to make linear motion. The cylinder 13 is fixedly connected to the connecting end of the driving member 2 through a connecting frame 23.

Specifically, a flange is arranged on the cylinder 13, and the flange of the cylinder 13 is opened to enable the connecting end of the sliding sleeve 12 to extend out of the cylinder 13 and be connected with the driving end of the turbine screw linear push rod. The flange of the cylinder 13 is used for being connected with a cylinder (not shown) of an extruder near the feeding pipe 11 and is positioned through the feeding pipe 11, a connecting plate (not shown) is arranged on the back surface of the flange of the cylinder 13, and the driving end part of the sliding sleeve 12 penetrates through the connecting plate and is connected with the driving end of the linear push rod of the turbine screw. The turbine screw linear push rod is fixed with the connecting plate through a mounting plate (not shown). The motor 22 is mounted on one side of the turbine screw linear push rod. The driving end of the turbine screw linear push rod penetrates through the mounting plate and the connecting plate and is connected with one end of the sliding sleeve 12. The end face of one side of the turbine screw linear push rod far away from the sliding sleeve 12 is fixedly provided with a sensor protection tube 24, a limit switch 25 is sleeved on the sensor protection tube 24, the limit switch 25 is arranged on the limit switch 25, and the tail end of the sensor protection tube 24 is connected with the other end of the linear displacement sensor 26. The motor 22 drives the turbine screw rod linear push rod to drive the sliding sleeve 12 to axially move, and the axial position of the sliding sleeve 12 is determined through the signal of the linear displacement sensor 26, so that three working position states, namely a large-caliber extrusion state, a small-caliber extrusion state and a discharging state, are realized. And the limit switch 25 is arranged on the sensor protection tube 24 and is used for detecting the axial position of the screw rod of the turbine screw rod linear push rod, so as to protect the whole device.

It is noted that in the existing manufacturing process of 3D printing additive by extruding polymer materials, when the printing is started, the material flows out from the extruding nozzle, the speed is increased from zero to the speed value required by extrusion, the time is relatively long, namely the response time is long, the extrusion speed required by 3D printing cannot be quickly reached, and the size of the product is affected. Similarly, when printing is stopped, material extrusion cannot be stopped effectively immediately, so that excessive material is extruded, and the appearance quality of the product is affected. According to the technical scheme, the device can be in an idle state when 3D printing is not performed, and materials are continuously discharged from the discharge hole 131. When 3D printing operation is required, the discharge port 131 is closed, the material is extruded from the discharge port 141 of the material conveying channel 14, and the device can be rapidly switched from the idle state to the printing state through the driving piece 2 and each sensor matched with the driving piece 2, so that the response time is short, and the material extrusion speed reaches the extrusion speed required by 3D printing in a short time. When 3D printing is stopped, the discharge port 131 is opened, and the material is rapidly discharged from the discharge port 131 without extruding excessive material from the printing nozzle, thereby achieving accurate printing.

The invention also proposes a 3D printing device (not shown) comprising a 3D printer nozzle 100 as described above.

Specifically, the 3D printing device includes the 3D printer nozzle 100 as described above, and further includes a moving mechanism, a printing platform, a light source, and the like, where the 3D printer nozzle 100 is connected to the moving mechanism, and the moving mechanism controls the 3D printer nozzle 100 to print on the printing platform, and the 3D printer nozzle 100 discharges the tapered material before printing, so that the material can be directly extruded for use during printing.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims (10)

1. The 3D printer nozzle is characterized by comprising a nozzle assembly, wherein the nozzle assembly comprises a feeding pipe, a sliding sleeve and a barrel which are sleeved in sequence from inside to outside, a material conveying channel is formed in the feeding pipe, the sliding sleeve and the barrel, and a discharging port is formed in the side wall of the barrel;

the sliding sleeve slides between the feeding pipe and the cylinder body and is provided with a first state and a second state;

in the first state, the discharge port is communicated with the material conveying channel, and the discharge port of the material conveying channel is closed;

in the second state, the material conveying channel is separated from the discharge port, and the discharge port of the material conveying channel is opened.

2. The 3D printer nozzle of claim 1, wherein the outer wall of the sliding sleeve is matched with the inner wall of the cylinder body to form a cavity, and the cavity has two communication states along with the sliding of the sliding sleeve;

in a first communication state, the cavity is communicated with the discharge port, and the cavity is separated from the discharge port;

and in a second communication state, the cavity is communicated with the discharge port, and the cavity is separated from the discharge port.

3. The 3D printer nozzle of claim 2, wherein a stopper is disposed in the cavity, the stopper is sleeved on the outer wall of the sliding sleeve, a first material channel and a second material channel are disposed in the sliding sleeve, a first through hole is radially formed in the sliding sleeve, a first end of the first material channel is communicated with a feed inlet of the material conveying channel, and a second end of the first material channel is communicated with the cavity through the first through hole; the sliding sleeve is provided with a second through hole along the radial direction, the first end of the second material channel is communicated with the cavity through the second through hole, and the second end of the second material channel is communicated with the discharge hole of the material conveying channel;

the stop piece slides along with the sliding sleeve to block the second through hole in the first communication state, and the cavity is separated from the discharge hole; and the cavity is communicated with the discharge hole.

4. A 3D printer nozzle as claimed in claim 3, wherein the stop member is arranged in a cylinder, the outer wall of the stop member abuts against the inner wall of the cylinder, and the inner wall of the stop member is matched with the outer wall of the sliding sleeve.

5. The 3D printer nozzle of claim 4, wherein the outer surface of the sliding sleeve for forming the cavity with the inner side wall of the cylinder is provided with a communication channel communicated with the outer side wall of the sliding sleeve, and a discharge hole is formed;

the sliding sleeve is in the first communication state, so that the discharge hole slides to be arranged opposite to the discharge hole, and the cavity is communicated with the discharge hole;

and under the second communication state, the sliding sleeve enables the outer side wall of the sliding sleeve to slide to be opposite to the discharge opening, so that the outer side wall of the sliding sleeve seals the discharge opening.

6. The 3D printer nozzle of claim 5, wherein the sliding sleeve comprises a cone section and a cylinder section, the cone section is arranged close to the discharge port, the outer side wall of the cone section close to the discharge port is matched with the inner wall of the discharge port, and the second material channel is arranged in the cone section;

the stop piece is sleeved on the outer wall of the cone section, a through hole penetrating through the other end face of the stop piece is formed in one end face of the stop piece, and a discharge hole of the material conveying channel is provided with two extrusion states along with the sliding of the sliding sleeve;

in a first extrusion state, the stop piece avoids the second through hole, the cone section partially stretches into the discharge hole, materials are extruded from the extrusion hole of the second material channel, and the outer side wall of the sliding sleeve seals the discharge hole;

in a second extrusion state, the stop piece avoids the second through hole, the cone section is drawn out from the discharge hole and positioned in the cavity, materials are extruded from the discharge hole from the second material channel through the cavity or directly through the cavity, and the outer side wall of the sliding sleeve seals the discharge hole.

7. The 3D printer nozzle of claim 6, wherein the outer wall of the cone section and the inner wall of the barrel cooperate to form the cavity, the outer wall of the cylinder section and the inner wall of the barrel cooperate, the first material channel is disposed in the cylinder section, and the first through hole is disposed in the outer wall of the cone section.

8. The 3D printer nozzle of any one of claims 1-7, wherein a discharge fitting is provided at the discharge port, the discharge fitting being in communication with the discharge port.

9. The 3D printer nozzle of any of claims 1-7, further comprising a drive member, wherein an end of the sliding sleeve proximate the feed tube is coupled to a drive end of the drive member.

10. A 3D printing device, characterized in that the 3D printing device comprises a 3D printer nozzle according to any of the preceding claims 1-9.