CN216832236U - Nozzle, printing head assembly and three-dimensional printing equipment - Google Patents

Abstract

The utility model provides a nozzle, printhead assembly and three-dimensional printing apparatus, the nozzle includes: the nozzle comprises a nozzle body, wherein a discharge channel and a discharge hole communicated with the discharge channel are formed in the nozzle body, a part of the inner wall of the discharge channel is provided with a concave accommodating hole, and the accommodating hole is communicated with the discharge channel; the leakage-proof block is at least partially positioned in the containing hole and can move between a first position and a second position, and the leakage-proof block blocks the discharging channel when positioned at the second position. The embodiment of the utility model provides a can solve among the prior art nozzle and leak the problem of material easily under the condition that need not to print.

Description

Nozzle, printing head assembly and three-dimensional printing equipment

Technical Field

The utility model relates to a three-dimensional printing technical field especially relates to a nozzle, printhead assembly and three-dimensional printing equipment.

Background

When carrying out three-dimensional printing, through need through the extruder with the printing consumables constantly crowded into beat printer head, melt the printing consumables through the heating piece, extrude from the nozzle again. Under the circumstances such as printing completion, printer outage or nozzle switch, because the temperature of heating the piece is still higher, consequently remaining consumptive material can melt under the effect of heating the piece in the nozzle to receive the influence of gravity to fall down, the printing consumptive material that spills leads to model and nozzle adhesion easily, thereby influences the printing effect of model.

Therefore, the prior art has the problem that the nozzle is easy to leak without printing.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a nozzle, a printing head assembly and a three-dimensional printing device, and the problem that the nozzle is prone to material leakage under the condition that printing is not needed is solved.

In order to achieve the above object, in a first aspect, the present invention provides a nozzle, including:

the nozzle comprises a nozzle body, wherein a discharge channel and a discharge hole communicated with the discharge channel are formed in the nozzle body, a concave accommodating hole is formed in the inner wall of the discharge channel, and the accommodating hole is communicated with the discharge channel;

the leakage-proof block is at least partially positioned in the containing hole and can move between a first position and a second position, and the leakage-proof block blocks the discharging channel when positioned at the second position.

Optionally, the depth of the leakage-proof block inserted into the discharging channel when the leakage-proof block is located at the first position is smaller than the depth of the leakage-proof block inserted into the discharging channel when the leakage-proof block is located at the second position.

Optionally, the nozzle further comprises an elastic member, the elastic member is located in the accommodating hole and connected with the nozzle body, the elastic member is further connected with the leakage-proof block, and the elastic member is used for applying a force to the leakage-proof block towards the second position.

Optionally, the leakage prevention block comprises a first side surface and a second side surface, the first side surface is farther away from the discharge hole than the second side surface, and along the extending direction of the discharge channel, the distance between the first side surface and the second side surface is gradually reduced from the end close to the containing hole to the end far away from the containing hole.

Optionally, the leakage-proof block is provided with a limiting piece, and the limiting piece is connected with the inner wall of the accommodating hole; in the process that the leakage-proof block moves between the first position and the second position, at least one part of the limiting piece is positioned in the accommodating hole.

Optionally, the nozzle still includes the mounting, the mounting with the nozzle body can be dismantled and be connected, works as the mounting with when the nozzle body is connected, the one end and the mounting butt of elastic component, the other end with leak protection piece butt.

Optionally, a part of the fixing member located in the nozzle body forms a clamping groove, and at least a part of the elastic member is located in the clamping groove.

Optionally, the fixing member is in threaded connection with the nozzle body.

In a second aspect, an embodiment of the present invention provides a printhead assembly, including extruder, choke, heating block and like the first aspect the nozzle, the extruder with the first end of choke is connected, the heating block is equipped with melts the material chamber, the second end of choke is located in the heating block and with melt material chamber intercommunication, the first end and the second end of choke do the double-phase opposite end of choke, nozzle body part is located in the heating block, just discharging channel with melt material chamber intercommunication.

In a third aspect, the present invention provides a three-dimensional printing apparatus, including a printing head assembly as described in the second aspect.

In this embodiment, the nozzle comprises the nozzle body and the leakage-proof block, and the amount of printing consumables entering the discharge port through the discharge channel can be controlled by moving the leakage-proof block between the first position and the second position. When the printing machine is specifically implemented, the leakage-proof block is positioned at the first position in the printing process, so that printing consumables can smoothly enter the discharge hole. After printing is finished, the leakage-proof block is located at the second position, so that the amount of printing consumables entering the discharge hole is reduced, and the probability of leakage of the nozzle under the condition of no need of printing is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a nozzle provided in an embodiment of the present invention;

FIG. 2 is a schematic exploded view of the nozzle provided in FIG. 1;

FIG. 3 is a schematic cross-sectional view of the nozzle provided in FIG. 1;

fig. 4 is a schematic structural view of a printhead assembly provided by the present invention;

FIG. 5 is an exploded view of the printhead assembly provided in FIG. 4.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Without conflict, the embodiments and features of the embodiments described below may be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

As shown in fig. 1-5, the present invention provides a nozzle 1, including:

the nozzle comprises a nozzle body 10, wherein a discharge channel 101 and a discharge hole 102 communicated with the discharge channel 101 are formed in the nozzle body 10, a concave accommodating hole 103 is formed in the inner wall of the discharge channel 101, and the accommodating hole 103 is communicated with the discharge channel 101;

the leakage-proof block 20, at least part of the leakage-proof block 20 is positioned in the containing hole 103, the leakage-proof block 20 can move between a first position and a second position, and the leakage-proof block 20 blocks the discharging channel 101 when positioned at the second position.

Optionally, in some embodiments, the depth of insertion of the block 20 into the tapping channel 101 when the block 20 is in the first position is less than the depth of insertion of the block 20 into the tapping channel 101 when the block 20 is in the second position.

It should be understood that the maximum cross-sectional area of the outfeed channel 101 through which printing consumables can pass when the leakage prevention block 20 is in the first position is greater than the maximum cross-sectional area of the outfeed channel 101 through which printing consumables can pass when the leakage prevention block 20 is in the second position.

It should be understood that the depth of the leakage prevention block 20 inserted into the outfeed channel 101 when the leakage prevention block 20 is in the first position is less than the depth of the leakage prevention block 20 inserted into the outfeed channel 101 when the leakage prevention block 20 is in the second position. it is understood that the greater the depth of the leakage prevention block 20 inserted into the outfeed channel 101, the smaller the cross-sectional area the outfeed channel 101 can pass through, and thus the less the amount of printing consumable material that can enter the outfeed 102 through the outfeed channel 101.

It should be understood that the depth of insertion of the block 20 into the tapping channel 101 when the block 20 is in the first position is not limited thereto. For example, in one embodiment, when the block 20 is in the first position, the block 20 is entirely located within the receiving hole 103. Likewise, the depth of the leakage-proof block 20 inserted into the discharging channel 101 when the leakage-proof block 20 is located at the second position is not limited herein. For example, in one embodiment, when the leakproof block 20 is in the second position, the outfeed channel 101 is blocked by the leakproof block 20, so that molten consumable cannot pass through the blockage of the outfeed channel 101.

It should be understood that the leakage prevention block 20 is movable between a first position and a second position, wherein the method of moving the leakage prevention block 20 between the first position and the second position is not limited herein. For example, in some embodiments, the nozzle 1 further comprises a drive assembly for driving the leakage prevention block 20 to move between the first position and the second position; still alternatively, the printer further comprises an extruder for feeding materials to the discharge channel, and the force of the extruder for extruding the printing consumables drives the leakage-proof block 20 to move from the second position to the second position.

It should be understood that when the block 20 is located at the first position, the second position, or any position between the first position and the second position, the block 20 is at least partially located in the receiving hole 103 to limit the axial movement of the block 20 along the discharging channel 101, and prevent the block 20 from being disengaged from the receiving hole 103.

The specific use of the nozzle 1 provided in this embodiment is as follows: during printing, printing consumables continuously enter the discharge channel 101. At this time, the leakage-proof block 20 moves from the second position to the first position, so that the printing consumables can smoothly enter the discharge port 102. Under the condition of not needing to print, with leak protection piece 20 from the first position to the second position, the part that leak protection piece 20 inserts discharge channel 101 produces certain blockking to the printing consumptive material to reduce substantially the volume of the printing consumptive material that gets into discharge gate 102 has improved the hourglass material condition of nozzle when beating printer head stop work. In actual use, the depth of the leakproof block 20 inserted into the discharging channel 101 can be adjusted, and the leakproof block 20 can be positioned at any position between the first position and the second position. The quantity and speed of the printing consumables entering the discharge port 102 can be adjusted by adjusting the depth of the leakage-proof block 20 inserted into the discharge channel 101.

In this embodiment, the nozzle 1 comprises the nozzle body 10 and the leakage-proof block 20, and the amount of printing consumables entering the discharge port 102 through the discharge channel 101 can be controlled by moving the leakage-proof block 20 between the first position and the second position. In particular, the leakage-proof block 20 can be located at the first position during the printing process, so that the printing consumables can smoothly enter the discharge port 102. After printing is finished, the leakage-proof block 20 is located at the second position to reduce the amount of printing consumables entering the discharge port 102, so that the probability of material leakage of the nozzle 1 in the case of no printing is reduced.

Optionally, the nozzle 1 further comprises an elastic member 30, the elastic member 30 is located in the containing hole 103 and connected to the nozzle body 10, the elastic member 30 is further connected to the leakage prevention block 20, and the elastic member 30 is configured to apply a force to the leakage prevention block 20 toward the second position.

In this embodiment, the nozzle 1 further comprises an elastic member 30, the elastic member 30 is located in the containing hole 103, and the elastic member 30 is connected to the leakage prevention block 20; when the first side surface is subjected to a squeezing force, the leakage-proof blocks 20 move from the second position to the first position, and the elastic pieces 30 are compressed by the leakage-proof blocks 20 and are in a compressed state; when the first side surface is not subjected to the pressing force, the elastic member 30 recovers the deformation and elongation to push the leakproof block to move from the first position to the second position.

It should be understood that the structure of the elastic member 30 is not limited thereto. For example, in one embodiment, the resilient member 30 is a spring. In another embodiment, the elastic member 30 is a leaf spring.

It should be understood that the specific connection manner of the elastic member 30 and the leakage prevention block 20 is not limited herein. For example, in one embodiment, the elastic member 30 is adhesively fixed to the block 20. In another embodiment, the elastic member 30 and the leakage prevention block 20 are fixed by welding.

It should be understood that the elastic member 30 may abut against the leakage preventing block 20. For example, in some embodiments, the shape of the accommodating hole 103 matches the shape of the elastic member 30 to limit the movement of the elastic member 30 in the target direction, and the elastic member 30 abuts against the leakage preventing block 20; wherein, in the present embodiment, the target direction is perpendicular to the compression direction of the elastic member 30.

In the actual use process, when the first side surface is subjected to the pressing force, the leakage preventing block 20 moves from the second position to the first position, and at this time, the elastic member 30 is compressed by the leakage preventing block 20 and is in a compressed state. The extrusion force applied to the first side face is generated when the extruding machine of the three-dimensional printing equipment is in a working state, and the printing consumables are extruded to enter the discharging channel 101. In the case of stopping printing, the extruder is in a shutdown state, so the first side surface is subjected to a smaller pressing force, i.e., the leakage preventing blocks 20 generate a smaller pressure on the elastic members 30. Since the elastic member 30 has a tendency to return to its natural state, when the elastic restoring force of the elastic member 30 is greater than the pressure of the leakage preventing block 20 acting on the elastic member 30, the elastic member 30 can push the leakage preventing block 20 to move from the first position to the second position.

In this embodiment, due to the arrangement of the elastic member 30, under the condition that the printing consumables continuously enter the discharge channel 101 under the action of the extruding machine, the leakage-proof block 20 moves from the second position to the first position, so that the printing consumables smoothly enter the discharge port 102. When the extruder is not in the working state, the elastic member 30 can push the leakage-proof block 20 to return from the first position to the second position, so as to reduce the amount of the printing consumables entering the discharge port 102. In this embodiment, the movement of the leakage preventing block 20 does not require manual operation, thereby improving the convenience of operation.

Optionally, in some embodiments, the leakage prevention block 20 includes a first side surface and a second side surface, the first side surface is farther from the discharge hole 102 than the second side surface, and a distance between the first side surface and the second side surface along the extension direction of the discharge channel 101 gradually decreases from an end close to the containing hole 103 to an end far from the containing hole 103.

It should be understood that the distance between the first side surface and the second side surface decreases from the end close to the receiving hole 103 to the end far from the receiving hole 103 along the extension direction of the discharging channel 101. Wherein the shape of the leakage prevention block 20 is different according to the distance between the first side surface and the second side surface along the extension direction of the discharging channel 101. For example, in some embodiments, the flashing blocks 20 may be wedge-shaped blocks.

It should be understood that the distance between the first side surface and the second side surface decreases from the end close to the receiving hole 103 to the end far from the receiving hole 103 along the extension direction of the discharging channel 101. Thus, the first side can be considered to be inclined with respect to the cross-section of the tapping channel 101.

In this embodiment, the first side surface is farther from the discharge hole 102 than the second side surface, and a distance between the first side surface and the second side surface along the extending direction of the discharge channel 101 gradually decreases from an end close to the containing hole 103 to an end far from the containing hole 103. The printing consumables are contacted with the first side surface after entering the discharging channel 101. Due to the first side surface being inclined relative to the cross section of the outfeed channel 101, it is possible, on the one hand, to prevent the printing consumables from accumulating on the leakage block 20 and, on the other hand, to facilitate the movement of the leakage block 20.

Optionally, in some embodiments, the leakage-proof block 20 is provided with a stopper, and the stopper is connected with the inner wall of the accommodating hole 103; in the process that the leakage preventing block 20 moves between the first position and the second position, at least a part of the limiting member is positioned in the accommodating hole 103.

It should be understood that the leakage prevention block 20 is provided with a limiting member, and the connection manner of the leakage prevention block 20 and the limiting member is not limited herein. For example, in one embodiment, the leakage prevention block 20 is integrally formed with the stopper. In another embodiment, the leakage prevention block 20 and the limiting member are fixed by welding.

It should be understood that, in some embodiments, the retaining member may be considered to be in close contact with the inner wall of the receiving hole 103, so that the receiving hole 103 may be considered to be a sealed cavity. Through the arrangement, printing consumables cannot enter the accommodating hole 103 in the printing process, so that the influence of the printing consumables on the leakage prevention block 20 and the elastic piece 30 is reduced.

It should be understood that, during the movement of the block 20 between the first position and the second position, at least a portion of the stopper is located in the receiving hole 103, so as to limit the axial movement of the block 20 along the discharging channel 101.

In this embodiment, the limiting member is disposed to limit the axial movement of the leakage-proof block 20 along the discharging channel 101, so as to improve the stability of the leakage-proof block 20. On the other hand, the printing consumables are prevented from entering the accommodating holes 103 to influence the movement of the printing consumables and the deformation of the elastic members 30.

Optionally, in some embodiments, the nozzle 1 further includes a fixing member 40, the fixing member 40 is detachably connected to the nozzle body 10 for limiting a moving position of the leakage preventing block 20, and when the fixing member 40 is connected to the nozzle body 10, one end of the elastic member 30 abuts against the fixing member 40, and the other end abuts against the leakage preventing block 20.

It should be understood that the specific connection manner of the fixing member 40 and the nozzle body 10 is not limited herein, for example, in some embodiments, the fixing member 40 and the nozzle body 10 are fixed in a snap-fit manner. In other embodiments, the securing member 40 is snap-fit to the nozzle body 10.

It should be understood that, in some embodiments, one end of the elastic member 30 may be connected to the fixing member 40, and the other end of the elastic member 30 may be connected to the leakage prevention block 20.

It should be understood that, in one instance, when the fixing member 40 is connected to the nozzle body 10, one end of the elastic member 30 abuts against the fixing member 40, and the other end abuts against the leakage preventing block 20, and it is understood that the leakage preventing block 20 is located in the containing hole 103 and away from the discharging passage 101. In another case, when the fixing member 40 is connected to the nozzle body 10, one end of the elastic member 30 abuts against the fixing member 40, and the other end abuts against the leakage preventing block 20, it can be understood that the nozzle body 10 is provided with a through hole, one end of the through hole is communicated with the accommodating hole 103, and the other end forms an opening in the outer wall of the nozzle body 10, and the fixing member 40 is located in the through hole and seals the opening.

In this embodiment, the nozzle 1 further includes a fixing member 40, and the structure of the fixing member 40 is not limited herein. By adjusting the structure of the fixing member 40, the end surface of the fixing member 40 abutting against the elastic member 30 can be adapted to the shape of the elastic member 30, thereby improving the stability of the elastic member 30. Meanwhile, the fixing piece 40 is detachably connected with the nozzle body 10, so that the convenience in replacing the fixing piece 40 is improved.

Optionally, in some embodiments, a portion of the fixing member 40 located in the receiving hole 103 of the nozzle body 10 forms a locking groove, and at least a portion of the elastic member 30 is located in the locking groove.

It should be understood that the portion may be understood that the fixing member 40 is located in the receiving hole 103 of the nozzle body 10 and surrounds the end surface of the elastic member 30, which may be a plane, an arc surface, or an irregular curved surface. In some embodiments, the portion is recessed into the nozzle body 10 to form the catch.

In this embodiment, the portion of the fixing member 40 located in the nozzle body 10 forms a locking groove, and at least a portion of the elastic member 30 is located in the locking groove. Through the arrangement, the elastic piece 30 can be limited to a certain extent, so that the stability of the elastic piece 30 is improved.

Optionally, in some embodiments, the fixing member 40 is screwed with the nozzle body 10.

It should be understood that the fixing member 40 is in threaded connection with the nozzle body 10, and it should be understood that the outer wall of the fixing member 40 is provided with a first thread structure, the inner wall of the nozzle body 10 is provided with a second thread structure matching with the first thread structure, and the fixing member 40 is in threaded connection with the nozzle body 10.

In this embodiment, since the fixing member 40 is screwed to the nozzle body 10, convenience in the detachment and attachment operations of the fixing member 40 to the nozzle body 10 is provided. Meanwhile, when the fixing member 40 is separated from the nozzle body 10, the elastic member 30 may be placed in the accommodating hole 103 via the connecting cavity, so that the installation convenience of the elastic member 30 is improved.

As a specific example, the present invention provides a nozzle 1, including:

the nozzle comprises a nozzle body 10, wherein a discharge channel 101 and a discharge hole 102 communicated with the discharge channel 101 are formed in the nozzle body 10, a concave accommodating hole 103 is formed in the inner wall of the discharge channel 101, and the accommodating hole 103 is communicated with the discharge channel 101;

a leakage-proof block 20, at least a part of the leakage-proof block 20 is positioned in the containing hole 103, the leakage-proof block 20 can move between a first position and a second position, and the leakage-proof block 20 blocks the discharging channel 101 when positioned in the second position.

Furthermore, the depth of the leakage-proof block 20 inserted into the discharging channel 101 when the leakage-proof block 20 is located at the first position is less than the depth of the leakage-proof block 20 inserted into the discharging channel 101 when the leakage-proof block 20 is located at the second position.

Furthermore, the nozzle 1 further comprises an elastic member 30, the elastic member 30 is located in the containing hole 103 and connected to the nozzle body 10, the elastic member 30 is further connected to the leakage prevention block 20, and the elastic member 30 is used for applying a force to the leakage prevention block 20 toward the second position.

Further, the leakage prevention block 20 includes a first side surface and a second side surface, the first side surface is farther from the discharge hole 102 than the second side surface, and the distance between the first side surface and the second side surface is gradually reduced from the end close to the containing hole 103 to the end far from the containing hole 103 along the extending direction of the discharge channel 101.

Furthermore, the leakage-proof block 20 is provided with a limiting member, and the limiting member is connected with the inner wall of the accommodating hole 103; in the process that the leakage preventing block 20 moves between the first position and the second position, at least a part of the limiting member is positioned in the accommodating hole 103.

Furthermore, the nozzle 1 further comprises a fixing member 40, the fixing member 40 is detachably connected to the nozzle body 10, when the fixing member 40 is connected to the nozzle body 10, one end of the elastic member 30 abuts against the fixing member 40, and the other end abuts against the leakage-proof block 20.

Further, the portion of the fixing member 40 located in the nozzle body 10 forms a locking groove, and at least a portion of the elastic member 30 is located in the locking groove.

Further, the fixing member 40 is screwed with the nozzle body 10.

As shown in fig. 4 and 5, the embodiment of the utility model provides a still provide a beat printer head assembly, including extruder, choke 2, heating block 3 and foretell nozzle 1, the extruder with the first end of choke 2 is connected, heating block 3 is equipped with the melting chamber, the second end of choke 2 is located in heating block 3 and with melting chamber intercommunication, the first end and the second end of choke 2 do the double-phase opposite end of choke 2, nozzle 1 body 10 part is located in heating block 3, just discharge channel with melting chamber intercommunication.

In this embodiment, the nozzle 1 is the nozzle 1 in the above embodiment, and the specific structure may refer to the description in the above embodiment, which is not described herein again. Since the nozzles 1 in the above-described embodiment are employed in the present embodiment, the present embodiment provides a printhead assembly having all the advantageous effects of the nozzles 1 in the above-described embodiment.

The embodiment of the utility model provides a three-dimensional printing equipment is still provided, including foretell printhead assembly. The printhead assembly is the printhead assembly in the above embodiment, and the specific structure may refer to the description in the above embodiment, which is not described herein again. Since the print head assembly in the above-described embodiment is employed in the present embodiment, the present embodiment provides a three-dimensional printing apparatus having all the advantageous effects of the print head assembly in the above-described embodiment.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A nozzle, comprising:

the nozzle comprises a nozzle body (10), wherein a discharge channel (101) and a discharge hole (102) communicated with the discharge channel (101) are formed in the nozzle body (10), a concave accommodating hole (103) is formed in the inner wall of the discharge channel (101), and the accommodating hole (103) is communicated with the discharge channel (101);

a leak-proof block (20), at least part of the leak-proof block (20) being located in the housing hole (103), the leak-proof block (20) being movable between a first position and a second position, the leak-proof block (20) blocking the tapping channel (101) when located in the second position.

2. Nozzle according to claim 1, characterized in that the depth of insertion of the leak-proof block (20) into the outlet channel (101) when the leak-proof block (20) is in the first position is smaller than the depth of insertion of the leak-proof block (20) into the outlet channel (101) when the leak-proof block (20) is in the second position.

3. Nozzle according to claim 1, characterized in that it further comprises an elastic element (30), said elastic element (30) being located inside said housing hole (103) and being connected to said nozzle body (10), said elastic element (30) being further connected to said leaktight block (20), said elastic element (30) being intended to exert a force on said leaktight block (20) towards said second position.

4. Nozzle according to claim 3, wherein the leaktight block (20) comprises a first side and a second side, the first side being more distant from the outfeed opening (102) than the second side, the distance between the first side and the second side decreasing from the end close to the housing hole (103) to the end distant from the housing hole (103) along the extension of the outfeed channel (101).

5. Nozzle according to claim 3, wherein the leak-proof block (20) is provided with a stop connected to the inner wall of the housing hole (103); during the process that the leakage-proof block (20) moves between the first position and the second position, at least one part of the limiting piece is positioned in the containing hole (103).

6. The nozzle according to claim 4, further comprising a fixing member (40), wherein the fixing member (40) is detachably connected to the nozzle body (10), and when the fixing member (40) is connected to the nozzle body (10), one end of the elastic member (30) abuts against the fixing member (40) and the other end abuts against the leakage preventing block (20).

7. The nozzle of claim 6, wherein a portion of the securing member (40) located within the nozzle body (10) forms a catch, at least a portion of the resilient member (30) being located within the catch.

8. The nozzle of claim 6, wherein the securing member (40) is threaded with the nozzle body (10).

9. A printhead assembly comprising an extruder, a throat (2), a heater block (3) and a nozzle (1) according to any one of claims 1 to 8, the extruder being connected to a first end of the throat (2), the heater block (3) being provided with a melt chamber, a second end of the throat (2) being located within the heater block (3) and communicating with the melt chamber, the first and second ends of the throat (2) being opposite ends of the throat (2), the nozzle body (10) being located partially within the heater block (3), and the discharge channel (101) being in communication with the melt chamber.

10. A three-dimensional printing apparatus comprising the printhead assembly of claim 9.

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