CN114083793A

CN114083793A - Extrusion mechanism and 3D printer

Info

Publication number: CN114083793A
Application number: CN202111208111.8A
Authority: CN
Inventors: 唐京科; 张海洋; 李强
Original assignee: Shenzhen Chuangxiang 3D Technology Co Ltd
Current assignee: Shenzhen Chuangxiang 3D Technology Co Ltd
Priority date: 2021-10-18
Filing date: 2021-10-18
Publication date: 2022-02-25
Anticipated expiration: 2041-10-18

Abstract

The invention relates to an extrusion mechanism and a 3D printer. The extrusion mechanism comprises a charging barrel, an extrusion screw and a pushing driving assembly; the charging barrel is provided with an accommodating cavity, the accommodating cavity comprises a first accommodating section, a second accommodating section and a third accommodating section which are sequentially distributed from top to bottom, the radial size of the first accommodating section is not smaller than that of the second accommodating section, the radial size of the second accommodating section is not smaller than that of the third accommodating section, and the radial size of the second accommodating section is gradually reduced downwards along the vertical direction; the extrusion screw is accommodated in the accommodating cavity, and the bottom diameter of the extrusion screw is gradually increased downwards along the vertical direction; the pushing driving assembly is connected with the extruding screw rod. Because the accommodation space that can hold the melting consumptive material reduces, then the pressure that the below consumptive material received can be bigger, is favorable to the consumptive material to flow downwards, and the second holds the cross-sectional area in the section and reduces gradually for the pressure that the consumptive material received is crescent, thereby avoids nozzle mouth department putty and disconnected material, makes the consumptive material can stably extrude.

Description

Extrusion mechanism and 3D printer

Technical Field

The invention relates to the technical field of 3D printing, in particular to an extrusion mechanism and a 3D printer.

Background

In the 3D printing technology based on FDM (Fused Deposition Modeling), a solid plastic wire is heated and melted into a liquid consumable material, and then extruded through a nozzle, and the consumable material is printed on a workbench layer by layer in a stacked manner, and stacked to form a certain shape, and the stacked liquid consumable material is cured and molded through heat dissipation. In the food 3D printing process, the food consumables are required to be in a molten state in the extrusion printing process and have certain viscosity and concentration, so that the extrusion port is easily blocked and disconnected.

Disclosure of Invention

Therefore, an extrusion mechanism is needed to be provided for solving the technical problem that the extrusion outlet of the food printer on the market is easy to block and break.

An extrusion mechanism comprising:

the nozzle is communicated with the third accommodating section, the radial size of the first accommodating section is not smaller than that of the second accommodating section, the radial size of the second accommodating section is not smaller than that of the third accommodating section, and the radial size of the second accommodating section is gradually reduced downwards along the vertical direction;

the extrusion screw rod is accommodated in the accommodating cavity and extends to the third accommodating section, and the bottom diameter of the extrusion screw rod is gradually increased downwards along the vertical direction;

the power output end of the pushing driving assembly is connected to the extrusion screw, and the pushing driving assembly is used for driving the extrusion screw to rotate.

In one embodiment, the bottom end of the extrusion screw is a conical surface, the radial dimension of the conical surface is gradually reduced downwards along the vertical direction, and the thread of the extrusion screw extends to the bottom end of the extrusion screw.

In one embodiment, a gap is formed between the bottom wall of the accommodating cavity and the conical surface.

In one embodiment, the accommodating cavity further comprises a fourth accommodating section, the upper end of the fourth accommodating section is communicated with the third accommodating cavity, the lower end of the fourth accommodating section is communicated with the nozzle, and the radial dimension of the fourth accommodating section is gradually reduced downwards along the vertical direction.

In one embodiment, the pushing drive assembly comprises an extrusion driving member, a first adapter and a second adapter;

the first adaptor is connected to the power output end of the extrusion driving piece, the second adaptor is connected to the upper end of the extrusion screw, one of the first adaptor and the second adaptor is provided with a limiting arm, and the other adaptor is provided with a guide groove and a limiting groove which are communicated with each other;

when the second adaptor is relatively close to the first adaptor, the limiting arm can slide into the limiting groove along the guide groove; when the second adaptor and the first adaptor rotate relatively, the limiting arm can slide to a locking position along the limiting groove so as to lock the first adaptor and the second adaptor.

In one embodiment, the second adaptor comprises an accommodating groove with an upward opening, the limiting groove and the guide groove are arranged on the side wall of the accommodating groove, the first adaptor further comprises a fixing block, the limiting arm is connected to the fixing block, and the fixing block is in clearance fit with the side wall of the accommodating groove; when the first adapter piece and the second adapter piece are relatively close to each other, the fixing block can slide into the accommodating groove.

In one embodiment, the extruding mechanism further comprises an elastic element, the elastic element is accommodated in the accommodating groove, the lower end of the elastic element abuts against the bottom wall of the accommodating groove, and the upper end of the elastic element abuts against the fixed block.

In one embodiment, the extrusion mechanism comprises:

a wall scraper connected to the extrusion screw;

a first detector mounted above the cartridge for detecting a height of a consumable within the cartridge;

a second detector mounted above the cartridge for detecting a position of the wall scraper;

if the wall scraper rotates to a first position below the first detector and the second detector, the first detector and the second detector are both in a trigger state; if the wall scraper rotates to deviate from the first position and the height of the material in the charging barrel is lower than a preset position, the first detector is in a triggering state, and the second detector is in a non-triggering state.

The invention also provides a 3D printer which can achieve at least one technical effect.

A3D printer comprises the extrusion mechanism, a platform mechanism and a moving mechanism; the platform mechanism is arranged below the extrusion mechanism, and the platform mechanism and the extrusion mechanism can move relatively along the vertical direction; the power output end of the moving mechanism is connected with the extruding mechanism, and the moving mechanism is used for driving the extruding mechanism to move along the horizontal direction.

In one embodiment, the 3D printer comprises a refrigerating mechanism, the refrigerating mechanism comprises a refrigerator, a gas pipe connector and a blowing block, one end of the gas pipe connector is communicated with a gas outlet end of the refrigerator, the blowing block is arranged on one side of the nozzle, a gas outlet hole and a conducting hole which are communicated with each other are formed in the blowing block, the other end of the gas pipe connector is communicated with the conducting hole, and the gas outlet hole is used for guiding out cold gas.

In one embodiment, the air-blowing block includes:

the first fixing plate comprises the through hole, the nozzle penetrates through the first fixing plate, an annular cavity is formed in the first fixing plate along the circumferential direction of the nozzle, and the annular cavity is communicated with the through hole;

the second fixing plate comprises the air outlet holes, the second fixing plate is connected with the first fixing plate, the air outlet holes are annularly arranged, and the air outlet holes are communicated with the annular cavity.

In one embodiment, the platform mechanism further comprises a printing platform, a supporting plate and an adjusting piece, the printing platform is arranged below the extrusion mechanism, the adjusting piece is connected with the supporting plate, one end of the adjusting piece is connected to the printing platform, and the other end of the adjusting piece penetrates through the supporting plate; the adjusting piece rotates to adjust the distance between the printing platform and the supporting plate.

In one embodiment, the 3D printer includes a housing and a material guide tube, the stage mechanism, the moving mechanism and the extruding mechanism are all disposed in the housing, the material guide tube is disposed on one side of the extruding mechanism, a material feeding hole is disposed on an upper wall of the housing, the material guide tube is communicated with the material feeding hole, and the moving mechanism can drive the extruding mechanism to move to one side of a discharging end of the material guide tube.

Has the advantages that:

the extrusion mechanism provided by the invention comprises a charging barrel, an extrusion screw and a pushing driving assembly; the charging barrel is provided with an accommodating cavity, the accommodating cavity comprises a first accommodating section, a second accommodating section and a third accommodating section which are sequentially distributed from top to bottom, the nozzle is communicated with the third accommodating section, the radial size of the first accommodating section is not smaller than that of the second accommodating section, the radial size of the second accommodating section is not smaller than that of the third accommodating section, and the radial size of the second accommodating section is gradually reduced downwards along the vertical direction; the extrusion screw rod is accommodated in the accommodating cavity and extends to the third accommodating section, and the bottom diameter of the extrusion screw rod is gradually increased downwards along the vertical direction; the power output end of the pushing driving assembly is connected to the extrusion screw, and the pushing driving assembly is used for driving the extrusion screw to rotate. When the extrusion screw rotates, the melting consumables in the charging barrel are pushed downwards, and the melting consumables gradually flow towards the outlet. Because the first radial dimension who holds the section is not less than the radial dimension that the second held the section, the second holds the radial dimension that the section is not less than the radial dimension that the third held the section, the accommodation space that can hold the melting consumptive material promptly reduces, therefore, in the vertical direction, the pressure that the more narrow regional melting consumptive material in below received can be bigger, be favorable to the decurrent flow of consumptive material, and the second holds the cross-sectional area that can hold the consumptive material in the section and reduces gradually, make the pressure that the melting consumptive material received increase gradually, then the decurrent velocity of flow of melting consumptive material crescent, thereby be convenient for the flow of melting consumptive material, and then can reduce the consumptive material and pile up in nozzle entrance and can't smoothly the probability of flowing down. After the putty probability reduces, also can reduce correspondingly because of the nozzle entry takes place to block up and leads to the discontinuous probability of blowout consumptive material, the consumptive material can be comparatively stable extrude from the nozzle.

Drawings

FIG. 1 is a cross-sectional view of an extrusion mechanism provided by the present invention;

FIG. 2 is a schematic view of an extrusion mechanism provided by the present invention;

FIG. 3 is an exploded view of an extrusion mechanism provided by the present invention;

FIG. 4 is a schematic view of a portion of an extrusion drive assembly of an extrusion mechanism provided in accordance with the present invention;

FIG. 5 is an internal schematic view of a 3D printer provided by the present invention;

FIG. 6 is a schematic diagram of a blowing block in a 3D printer provided by the present invention;

FIG. 7 is a schematic diagram of a platform mechanism in a 3D printer provided by the present invention;

FIG. 8 is a partial schematic view of a platform mechanism in a 3D printer provided in accordance with the present invention;

FIG. 9 is a schematic diagram of a movement mechanism in a 3D printer provided by the present invention;

fig. 10 is a schematic diagram of a 3D printer provided by the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

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

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 and 2, fig. 1 is a cross-sectional view of an extrusion mechanism 100 provided by the present invention; fig. 2 is a schematic view of an extrusion mechanism 100 provided by the present invention. The extrusion mechanism 100 provided by an embodiment of the present invention includes a barrel 110, an extrusion screw 121, and a pushing drive assembly 120; the charging barrel 110 is provided with an accommodating cavity, the accommodating cavity comprises a first accommodating section 112, a second accommodating section 113 and a third accommodating section 114 which are sequentially distributed from top to bottom, the nozzle 111 is communicated with the third accommodating section 114, the radial size of the first accommodating section 112 is not smaller than that of the second accommodating section 113, the radial size of the second accommodating section 113 is not smaller than that of the third accommodating section 114, and the radial size of the second accommodating section 113 is gradually reduced downwards along the vertical direction; the extrusion screw 121 is accommodated in the accommodating cavity, the extrusion screw 121 extends to the third accommodating section 114, and the bottom diameter of the extrusion screw 121 gradually increases downwards along the vertical direction; the power output end of the pushing driving assembly 120 is connected to the extruding screw 121, and the pushing driving assembly 120 is used for driving the extruding screw 121 to rotate.

The extrusion mechanism 100 in the present application is applied to a 3D printer, and the extrusion mechanism 100 includes a heating member 150. 3D printer is at the printing process, holds solid-state consumptive material earlier in the intracavity that holds of feed cylinder 110, then heats the lateral wall of feed cylinder 110 through heating member 150 to make solid-state consumptive material be heated and form the molten state, solid-state consumptive material is being heated the in-process, pushes away the driving piece and drives extrusion screw rod 121 and rotate, then extrudes screw rod 121 stirring and pushes away the consumptive material that holds the chamber, so that the consumptive material of molten state can follow nozzle 111 and extrude, with the printing model.

Specifically, when the extrusion screw 121 rotates, the molten consumables in the barrel 110 are pushed downward, and the molten consumables gradually flow toward the outlet. First radial dimension who holds section 112 is not less than the radial dimension that the second held section 113, the second holds the radial dimension that section 113 is not less than the third and holds section 114, can hold the accommodation space of melting consumptive material promptly and reduce, therefore, in the vertical direction, the pressure that the more narrow regional melting consumptive material in below received can be bigger, be favorable to the decurrent flow of consumptive material, and the second holds the cross-sectional area that can hold the consumptive material in section 113 and reduces gradually, make the pressure that the melting consumptive material received increase gradually, then the decurrent velocity of flow of melting consumptive material crescent, thereby be convenient for the flow of melting consumptive material, and then can reduce the consumptive material and pile up in nozzle 111 entrance and the probability that can't smoothly flow down. After the probability of material blockage is reduced, the probability of discontinuous ejection consumables due to the blockage of the inlet of the nozzle 111 is correspondingly reduced, and the consumables can be extruded from the nozzle 111 more stably.

Further, the radial dimension of the third accommodation section 114 is constant. Because the extrusion screw 121 is of a gradual change type, the outer diameter of the extrusion screw 121 is gradually increased along the vertical direction, and the radial dimension of the third accommodating section 114 is constant, then the gap 1226 between the extrusion screw 121 and the inner wall of the third accommodating section 114 is gradually narrowed, so that the consumable is in full contact with the side wall of the third accommodating section 114, and the heating effect of the heating element 150 on the consumable is improved.

Furthermore, the pushing device further includes a supporting assembly 130, the barrel 110 is mounted on the supporting assembly 130, and the pushing driving member is connected to the supporting assembly 130 and located above the barrel 110. The feed cylinder 110 top has the opening, and the upper end of extruding screw 121 stretches out the opening, connects in the power take off end who pushes away the driving piece, and the lower extreme of extruding screw 121 stretches into in the feed cylinder 110, and the drive of extruding screw 121 through pushing away the driving piece rotates to the realization is to holding the stirring of intracavity consumptive material and pushing away.

Referring to fig. 1 and 3, fig. 3 is an exploded view of an extrusion mechanism 100 provided by the present invention. In one embodiment, the depth of the screw grooves 1224 of the extrusion screw 121 decreases downward in the vertical direction.

Specifically, the extrusion screw 121 pushes the consumables downward in the screw groove 1224 during rotation, and since the depth of the screw groove 1224 of the extrusion screw 121 is gradually reduced, granular solid heated in the screw groove 1224 and pushed forward by the extrusion screw 121 can be gradually compacted and converted into continuous melt, so that continuous conveyance of the consumables can be ensured. Meanwhile, the depth of the screw groove 1224 of the extrusion screw 121 is gradually reduced, so that the delivery flow of the consumable is gradually reduced, and the nozzle 111 can be prevented from being blocked due to accumulation of the molten consumable in the nozzle 111 to a certain extent.

Referring to fig. 1, in one embodiment, the sectional area of the last screw groove 1224 is adapted to the sectional area of the upper end of the nozzle 111, that is, the volume of the consumable extruded from the lower end of the extrusion screw 121 in a unit time is the same as the volume of the consumable extruded from the nozzle 111, so as to prevent the nozzle 111 from being blocked due to the fact that the consumable cannot be extruded in time at the port of the nozzle 111 when the volume of the consumable extruded from the lower end of the extrusion screw 121 in a unit time is larger than the volume of the consumable extruded from the nozzle 111, and to prevent the nozzle 111 from being broken due to the fact that no consumable is extruded when the volume of the consumable extruded from the lower end of the extrusion screw 121 in a unit time is smaller than the volume of the consumable extruded from the nozzle 111.

With continued reference to fig. 1, in one embodiment, the bottom end of the extrusion screw 121 is tapered 1225, the radial dimension of the tapered surface 1225 decreases downward in the vertical direction, and the flight 1223 of the extrusion screw 121 extends to the bottom end of the extrusion screw 121.

Specifically, since the bottom end of the extrusion screw 121 is a tapered surface 1225, the tapered surface 1225 can continue to stir the molten consumable after the consumable in a molten state is conveyed to the bottom end of the extrusion screw 121 by the screw groove 1224, thereby preventing the consumable from being solidified and solidified before reaching the nozzle 111. Simultaneously conical surface 1225 can play the guide effect for can slide along conical surface 1225 from the terminal melting consumptive material of extrusion screw 121, thereby can avoid to a certain extent that the melting consumptive material piles up in the one side that extrudes screw 121 lower extreme and is located the third and hold section 114 inner wall, make the melting consumptive material that extrudes screw 121 lower extreme is located the one side that the third holds section 114 inner wall can flow to central zone, thereby the melting consumptive material of being convenient for is pushed to nozzle 111 mouthful. Because the radial dimension of conical surface 1225 is along following the downward taper in vertical direction to make the outer wall that the melting consumptive material can be stable along conical surface 1225 slide, and then be convenient for the stable input of melting consumptive material.

Further, nozzle 111 is located the below of the pointed end of conical surface 1225 to make the outer wall along conical surface 1225 that the melting consumptive material can be stable slide to the pointed end, and then carried to nozzle 111's top, then through the pushing of top melting consumptive material, the melting consumptive material can be accurate push nozzle 111 intraorally, and then be convenient for nozzle 111 extrude the consumptive material, realize 3D and print.

Referring also to fig. 1, in one embodiment, a gap 1226 is provided between the bottom wall of the receiving cavity and the tapered surface 1225.

Specifically, since the gap 1226 is provided between the bottom wall of the receiving chamber and the tapered surface 1225, the molten consumable pushed to the lower end of the tapered surface 1225 by the extrusion screw 121 can be buffered in the gap 1226, and when the consumable reaches the bottom wall of the cartridge 110, the impact force on the bottom wall of the cartridge 110 is small, and the bottom wall of the cartridge 110 is not easily worn seriously due to long-term strong impact. In addition, because the consumptive material is less to the diapire impact force, it is corresponding, the diapire exerts also less in the reaction force of consumptive material, and the consumptive material is difficult to cause serious reverse impact to the consumptive material of top after colliding the diapire, and then makes that the melting consumptive material can be stable extrude from nozzle 111.

Referring to fig. 1 and 3, in one embodiment, the accommodating cavity further includes a fourth accommodating section 115, an upper end of the fourth accommodating section 115 is communicated with the third accommodating cavity, a lower end of the fourth accommodating section 115 is communicated with the nozzle 111, and a radial dimension of the fourth accommodating section 115 is gradually reduced downward along a vertical direction.

Specifically, the gap 1226 is located between the bottom wall of the fourth receiving section 115 and the tapered surface 1225. Since the radial dimension of the fourth containing section 115 is gradually decreased downward along the vertical direction, the consumables located in the gap 1226 may be subjected to a downward force by the fourth containing section 115, so as to facilitate the consumables in the gap 1226 to flow downward along the sidewall of the fourth containing section 115. Since the lower end of the fourth accommodating section 115 is communicated with the nozzle 111, the consumables located in the gap 1226 can flow down to the nozzle 111 along the sidewall of the fourth accommodating section 115, thereby facilitating the nozzle 111 to extrude the molten consumables.

With continued reference to fig. 1, in one embodiment, a portion of the flights 1223 on the extrusion screw 121 are positioned above the second containment section 113.

Specifically, because the partial thread 1223 on the extrusion screw 121 is located above the second accommodation section 113, the extrusion screw 121 can stir the consumables in the second accommodation section 113, and the melting consumables located above the second accommodation section 113 in the larger accommodation space are driven to the second accommodation section 113 below in the smaller accommodation space, so that the pressure of the melting consumables is increased, and the melting consumables can flow downward.

With continued reference to FIG. 1, in one embodiment, the outer diameter of the extrusion screw 121 is equal, and the clearance 1226 between the outer diameter of the extrusion screw 121 and the inner wall of the third accommodation section 114 is

Specifically, because the extrusion screw 121 is in clearance 1226 fit with the third accommodating section 114, most of the solid consumables with large volume cannot fall into the third accommodating section 114, so that the risk that the solid consumables with large volume are not completely melted during the stirring and pushing processes of the extrusion screw 121 to block the nozzle 111 can be reduced.

Further, the heating element 150 is mounted to the support assembly 130 so as to transfer heat from the support assembly 130 to the cartridge 110 by heat radiation. Because the clearance 1226 cooperation of the extrusion screw 121 and the third containing section 114, the consumable material located in the third containing section 114 can be in sufficient contact with the wall of the charging barrel 110, so that the consumable material located in the third containing section 114 can be heated sufficiently, the melting state of the consumable material is ensured, and the consumable material is conveniently pushed to the nozzle 111 by the extrusion screw 121.

Referring to fig. 1 and 3, in one embodiment, the heating member 150 is mounted on the support assembly 130 at a position corresponding to the second receiving section 113.

Specifically, since the heating member 150 is installed at a position on the support assembly 130 corresponding to the second accommodating section 113, the consumable material located at the second accommodating section 113 can receive more heat, so that melting can be accelerated. Because the partial thread 1223 on the extrusion screw 121 is located above the second accommodating section 113, the extrusion screw 121 can stir and push the consumable, so that the consumable with a heat source can be diffused from outside to inside along the radial direction, the temperature distribution of each region along the radial direction is more uniform, the inner region cannot be melted due to too low temperature, and the outer region cannot be liquefied due to too high temperature.

Referring to fig. 1, 3 and 4, fig. 4 is a partial schematic view of an extrusion driving assembly in an extrusion mechanism 100 provided by the present invention. In one embodiment, the pushing drive assembly 120 comprises a pushing drive member 122, a first adaptor 123 and a second adaptor 124; the first adaptor 123 is connected to the power output end of the extrusion driving member 122, the second adaptor 124 is connected to the upper end of the extrusion screw 121, one of the first adaptor 123 and the second adaptor 124 is provided with a limiting arm 1232, and the other is provided with a guide groove 1243 and a limiting groove 1242 which are mutually communicated; when the second adaptor 124 and the first adaptor 123 are relatively close to each other, the limiting arm 1232 can slide into the limiting groove 1242 along the guide groove 1243; when the second adaptor 124 and the first adaptor 123 rotate relatively, the limiting arm 1232 can slide along the limiting groove 1242 to the locking position, so as to lock the first adaptor 123 and the second adaptor 124.

Specifically, when the extrusion screw 121 and the extrusion driving member 122 need to be detached, the second adaptor 124 and the first adaptor 123 are relatively rotated, so that the limiting arm 1232 moves from the locking position to the limiting groove 1242 and is conducted to one end of the guide groove 1243, then the second adaptor 124 and the first adaptor 123 are relatively far away, and the limiting arm 1232 slides out along the side wall of the guide groove 1243, thereby separating the extrusion screw 121 from the extrusion driving member 122, and facilitating the cleaning of the extrusion screw 121 and the barrel 110. Wherein the extrusion drive 122 is a motor.

Further, no other connecting structure such as a bearing is provided between the extrusion screw 121 and the barrel 110, and the extrusion screw 121 can be removed from the barrel 110 after the second adaptor 124 is separated from the first adaptor 123. The extrusion driver 122 is located above the barrel 110, and therefore, when the extrusion screw 121 is removed, the extrusion screw 121 needs to be inclined with respect to the vertical direction, so that the upper end of the extrusion screw 121 can be staggered with respect to the extrusion driver 122 and removed from the opening of the barrel 110, thereby facilitating the cleaning of the extrusion driver 122 and the barrel 110.

Further, the locking position is an end of the stopper groove 1242 away from the guide groove 1243. When the extrusion screw 121 and the extrusion driving member 122 rotate relatively, the limiting arm 1232 slides along the limiting groove 1242 to an end of the limiting groove 1242 away from the guiding groove 1243, and abuts against an inner wall of the limiting groove 1242, so as to limit the relative rotation of the extrusion screw 121 and the extrusion driving member 122. When the limiting arm 1232 is limited at the locking position, since no bearing or other connecting structure is disposed between the extrusion screw 121 and the barrel 110, the extrusion screw 121 is suspended on the extrusion driving member 122, and due to the gravity of the extrusion screw 121, the upper wall of the locking position abuts against the upper side of the limiting arm 1232, so as to limit the limiting arm 1232 to move in the vertical direction. The extrusion screw 121 is rotated in synchronization with the extrusion driver 122 when the extrusion driver 122 is rotated.

It should be noted that, when the power output shaft of the extrusion driving member 122 works, the rotating direction is the same as the direction in which the limiting arm 1232 slides from the communicating position of the guide groove 1243 and the limiting groove 1242 to the locking position, and when the power output shaft of the extrusion driving member 122 rotates, the inner wall of the locking position can abut against the limiting arm 1232, so as to prevent the limiting arm 1232 from sliding reversely relative to the limiting groove 1242. Preferably, the stopper arm 1232 extends in a horizontal direction, and the guide groove 1243 extends in a vertical direction.

With continued reference to fig. 1, 3 and 4, in one embodiment, the second adaptor 124 includes an accommodating recess 1241 with an upward opening, the limiting groove 1242 and the guiding groove 1243 are disposed on the sidewall of the accommodating recess 1241, the first adaptor 123 further includes a fixing block 1231, the limiting arm 1232 is connected to the fixing block 1231, and the fixing block 1231 is engaged with the sidewall gap 1226 of the accommodating recess 1241; when the first adapter 123 and the second adapter 124 are relatively close to each other, the fixing block 1231 can slide into the receiving groove 1241.

Specifically, since the fixing block 1231 is engaged with the sidewall gap 1226 of the accommodating groove 1241, when the limiting arm 1232 slides along the guide groove 1243, the accommodating groove 1241 can guide the fixing block 1231, so that the limiting arm 1232 accurately slides into the limiting groove 1242 along the guide groove 1243 and slides to the locking position. Preferably, the fixing block 1231 is cylindrical, and when the first adaptor 123 and the second adaptor 124 rotate relatively, the fixing block 1231 can rotate relative to the sidewall of the accommodating recess 1241 and is always accommodated in the accommodating recess 1241.

Furthermore, the limiting groove 1242 and the guiding groove 1243 are disposed on the sidewall of the accommodating recess 1241. The number of the limiting grooves 1242 is two, and the two limiting grooves 1242 are symmetrically arranged. Correspondingly, the number of the guide slots 1243 is two, and the two limiting arms 1232 respectively slide into the limiting slots 1242 along the corresponding guide slots 1243 and slide into the locking positions from the limiting slots 1242, so that the limiting arms 1232 are stably locked in the locking positions, and the second adaptor 124 is stably connected with the first adaptor 123. It should be noted that the number of the limit groove 1242 and the guide groove 1243 may be one, as long as the lock of the limit arm 1232 can be achieved.

In other embodiments, the second adaptor 124 includes a retaining arm 1232 extending in a horizontal plane; the first adapter 123 includes a receiving recess 1241 with a downward opening, and the limiting recess 1242 and the guiding recess 1243 are disposed on a sidewall of the receiving recess 1241. The specific connection method is similar to that of the previous embodiment, and thus is not described again.

Referring to fig. 4, in one embodiment, the guide groove 1243 and the limiting groove 1242 radially penetrate through the groove wall of the receiving groove 1241.

Specifically, the guide slot 1243 has an upward opening. When the second adaptor 124 approaches the first adaptor 123, the limiting arm 1232 extends into the guide slot 1243 from the opening of the guide slot 1243 and can slide into the limiting slot 1242 along the guide slot 1243. Since the guide groove 1243 radially penetrates through the groove wall of the accommodating recess 1241, the contact area between the limiting arm 1232 and the groove wall of the guide groove 1243 is larger, so that the limiting arm 1232 can stably slide along the guide groove 1243. Since the limiting groove 1242 radially penetrates through the groove wall of the accommodating groove 1241, the contact area between the limiting arm 1232 and the groove wall of the limiting groove 1242 is larger, so that the limiting groove 1242 stably limits the limiting arm 1232.

In other embodiments, the guide groove 1243 does not radially penetrate through the groove wall of the receiving groove 1241, as long as the guide of the limiting arm 1232 can be achieved. The limiting groove 1242 does not penetrate through the groove wall of the accommodating groove 1241 in the radial direction, and only needs to limit the limiting arm 1232.

Referring to fig. 1 and 4, in one embodiment, the extruding mechanism 100 further includes an elastic element 125, the elastic element 125 is accommodated in the accommodating recess 1241, a lower end of the elastic element 125 abuts against a bottom wall of the accommodating recess 1241, and an upper end of the elastic element 125 abuts against the fixing block 1231.

Specifically, when the fixing block 1231 slides into the receiving groove 1241, the lower end of the fixing block 1231 abuts against the elastic member 125. When the limiting arm 1232 slides to the limiting groove 1242 along the guide groove 1243, the fixing block 1231 and the limiting arm 1232 move synchronously, and the elastic member 125 is pressed downward by the fixing block 1231, so that the elastic member 125 is compressed. When the limiting arm 1232 slides to the locking position along the limiting groove 1242, since the fixing block 1231 receives the upward restoring force of the elastic member 125, the limiting arm 1232 receives the upward thrust, so that the upper end of the limiting arm 1232 abuts against the upper wall of the locking position, thereby limiting the limiting arm 1232 and limiting the limiting arm 1232 to reversely slide out of the limiting groove 1242. Wherein the elastic member 125 is a spring.

Referring to fig. 4, in one embodiment, a locking groove 1244 is formed on a side wall of the receiving groove 1241, the locking groove 1244 is in communication with the limiting groove 1242, a size of the locking groove 1244 in the vertical direction is greater than a size of the limiting groove 1242 in the vertical direction, and a step face 1245 is formed at a connection portion of the locking groove 1244 and an upper end of the limiting groove 1242; when the extrusion screw 121 and the extrusion driving member 122 rotate relatively, the limiting arm 1232 can slide to the locking groove 1244 along the limiting groove 1242 to lock the first adaptor 123 and the second adaptor 124, and the stepped surface 1245 is used for limiting the limiting arm 1232 to slide reversely to exit from the locking groove 1244.

Specifically, the locked position is in the locking slot 1244. When first adaptor 123 rotates relatively for second adaptor 124, spacing arm 1232 can slide to locking groove 1244 along spacing groove 1242, because fixed block 1231 receives the ascending thrust of elastic component 125, then fixed block 1231 drives spacing arm 1232 rebound to the upper end that makes spacing arm 1232 support tightly and locking groove 1244, thereby it is spacing to move along vertical direction to spacing arm 1232. Because the size of locking groove 1244 along vertical direction is greater than the size of spacing groove 1242 along vertical direction, and the junction of locking groove 1244 and the spacing groove 1242 upper end forms step face 1245, then one side butt in step face 1245 of spacing arm 1232, the opposite side butt in the end wall of locking groove 1244, thereby it is spacing to carry out the both sides along the horizontal direction to spacing groove 1242, consequently, the stable locking in locking groove 1244 of spacing arm 1232, make first adaptor 123 and the stable being connected of second adaptor 124.

When the first adaptor 123 and the second adaptor 124 need to be disassembled, a downward thrust is applied to the first adaptor 123, so that the elastic member 125 is stressed to be compressed, at this time, the limiting arm 1232 moves downward, because one side of the limiting arm 1232 is no longer abutted to the step face 1245, when the first adaptor 123 and the second adaptor 124 rotate relatively, the limiting arm 1232 can slide to the limiting groove 1242 from the locking groove 1244, and then slide to the communication position between the limiting groove 1242 and the guide groove 1243, when the second adaptor 124 and the first adaptor 123 are relatively far away, the limiting arm 1232 slides out along the guide groove 1243, and the first adaptor 123 and the second adaptor 124 are separated.

Referring to fig. 1 and 4, in one embodiment, a mounting hole with a downward opening is formed at a lower end of the second adaptor 124, the mounting hole is communicated with the accommodating recess 1241, a diameter of the mounting hole is smaller than a diameter of the accommodating recess 1241, and a step face 1245 is formed at a connection position of the mounting hole and the accommodating recess 1241; the upper end of the extrusion screw 121 extends into the accommodating recess 1241 from the mounting hole and is connected to the sidewall of the mounting hole, the lower end of the elastic element 125 abuts against the stepped surface 1245, and the lower end of the elastic element 125 is sleeved on the extrusion screw 121.

Specifically, since the upper end of the extrusion screw 121 extends into the mounting hole and is connected to the sidewall of the mounting hole, the extrusion screw 121 and the second adaptor 124 are stably connected. Because the upper end of the extrusion screw 121 extends into the accommodating groove 1241 from the mounting hole, the lower end of the spring can be sleeved on the extrusion screw 121, so that the compression of the spring plays a guiding role, and the spring can apply stable upward thrust to the fixing block 1231.

Further, the extrusion mechanism 100 further comprises a fastening member 126, a fastening hole 128 is formed in a side wall of the mounting hole, and the fastening member 126 passes through the fastening hole 128 and abuts against a side wall of the extrusion screw 121, so that the extrusion screw 121 is stably connected to the side wall of the mounting hole, and the extrusion screw 121 and the second adaptor 124 can rotate synchronously. Wherein the fasteners 126 are screws.

Furthermore, the extruding mechanism 100 further includes a positioning element, a connecting hole 1233 and a positioning hole 1234 are disposed on the fixing block 1231, the connecting hole 1233 extends in the vertical direction, the positioning hole 1234 is communicated with the connecting hole 1233, and the positioning hole 1234 extends in the radial direction. The power output shaft of the extrusion driving member 122 extends into the connection hole 1233, and the positioning member penetrates through the positioning hole 1234 to abut against the sidewall of the power output shaft, so that the first rotating member 123 is stably connected with the fixing block 1231, and the extrusion driving member 122 drives the first rotating member 123 to rotate. Wherein the positioning piece is a screw.

Referring to fig. 1 and 2, in one embodiment, the support assembly 130 includes a main body 131 and a rotating door 132, one end of the rotating door 132 is rotatably connected to the main body 131, and the other end of the rotating door 132 is detachably connected to the main body 131; when the other end of the rotary door 132 is connected to the main body 131, the rotary door 132 and the main body 131 enclose a mounting cavity for mounting the cartridge 110.

Specifically, the extrusion driver 122 is connected to the body member 131. Since the other end of the rotary door 132 is detachably connected to the main body member 131, when the other end of the rotary door 132 is detached from the main body member 131, an opening is formed between the other end of the rotary door 132 and the main body member 131, so that the cartridge 110 can be removed from the opening after the extrusion screw 121 is removed from the cartridge 110, thereby facilitating the cleaning of the cartridge 110. When the second adaptor 124 is separated from the first adaptor 123, the extrusion screw 121 and the barrel 110 may be synchronously moved out of the support assembly 130, and then the extrusion screw 121 is moved out of the barrel 110.

Further, the extruding mechanism 100 includes a hinge 133, and one end of the hinge 133 is connected to the main body member 131 and the other end is connected to one end of the swing door 132, so that one end of the swing door 132 is rotatably connected to the main body member 131. Then when one end of the turnstile 132 is rotated relative to the body member 131, the other end of the turnstile 132 is allowed to have a larger opening with the body member 131, thereby facilitating the removal of the cartridge 110 from the mounting cavity.

Further, the extruding mechanism 100 includes a buckle 134 and a snap ring 135, the buckle 134 is mounted to the main body member 131, the snap ring 135 is mounted to the other end of the swing door 132, and the snap ring 135 can rotate relative to the buckle 134 so as to be snap-fitted or removed with the buckle 134. The specific structures of the latch 134 and the snap ring 135 are the prior art, and therefore are not described in detail.

Referring to fig. 1 and 2, in one embodiment, the extrusion mechanism 100 includes a wall scraper 127, a first detector 160, and a second detector 170; the wall scraper 127 is connected to the extrusion screw 121; a first detector 160 is installed above the cartridge 110, the first detector 160 for detecting the height of the consumables in the cartridge 110; a second detector 170 is installed above the cartridge 110, the second detector 170 being for detecting the position of the wall scraper 127; if the wall scraper 127 rotates to the first position below the first detector 160 and the second detector 170, the first detector 160 and the second detector 170 are both in a triggered state; if the wall scraper 127 is rotated to deviate from the first position and the material level in the barrel 110 is lower than the predetermined position, the first detector 160 is in the activated state and the second detector 170 is in the deactivated state.

Specifically, the wall scraper 127 is attached to the inner wall of the first accommodating section 112, and one end of the wall scraper 127 away from the extrusion screw 121 abuts against the inner wall of the first accommodating section 112. When extruding drive piece 122 drive and extruding screw 121 and rotate, scrape wall ware 127 and extrude screw 121 synchronous revolution to can scrape and glue the consumptive material of gluing on holding the intracavity wall, thereby avoid the waste of consumptive material.

If the first detector 160 and the second detector 170 are both in the triggered state, it cannot be determined whether the triggering of the first detector 160 is caused by insufficient material or the wall scraper 127 rotates to the first position. If the second detector 170 is in the non-activated state, it is indicated that the wall scraper 127 is not in the first position, and if the first detector 160 is in the activated state, it is ensured that the first detector 160 is activated due to insufficient material, rather than being interfered by the wall scraper 127. Therefore, if the second detector 170 is in the non-triggered state and the first detector 160 is in the triggered state, the controller will send an alarm after receiving the signals returned by the two detectors, and prompt the operator to supplement the material in time. Preferably, the first detector 160 is a distance sensor and the second detector 170 is a proximity sensor. It should be noted that the first position is not a specific point, but an area within which the corresponding sensor can sense the first position.

Referring to fig. 1, 2, 3, 4 and 5, fig. 5 is an internal schematic view of a 3D printer according to the present invention. The 3D printer provided in an embodiment of the present invention includes the above-mentioned extrusion mechanism 100, further includes a platform mechanism 400 and a moving mechanism 200; the platform mechanism 400 is arranged below the extrusion mechanism 100, and the platform mechanism 400 and the extrusion mechanism 100 can move relatively in the vertical direction; the power output end of the moving mechanism 200 is connected to the extruding mechanism 100, and the moving mechanism 200 is used for driving the extruding mechanism 100 to move along the horizontal direction.

Specifically, the moving mechanism 200 drives the extruding mechanism 100 to move in the horizontal direction, and the platform structure and the extruding mechanism 100 can move relatively in the vertical direction, so that the 3D printing mechanism can move above the platform mechanism 400, and the extruding mechanism 100 can realize 3D printing.

3D printer in this application, accommodation space through can holding the melting consumptive material reduces, make the pressure that the more narrow regional melting consumptive material in below received can be bigger, be favorable to the decurrent flow of consumptive material, and the second holds the cross-sectional area that can hold the consumptive material in the section 113 and reduces gradually, make the pressure crescent that the melting consumptive material received, then the decurrent velocity of flow crescent of melting consumptive material, thereby be convenient for the flow of melting consumptive material, and then can reduce the consumptive material and pile up in nozzle 111 entrance and can't smoothly the probability of flowing down. And through first adaptor 123 and second adaptor 124 stable connection, and convenient to detach installation to make extrusion screw 121 can be stable realization stirring and push the consumptive material, simultaneously can be convenient with extrude that driving piece 122 dismantles, thereby make extrusion screw 121 can shift out feed cylinder 110, thereby be convenient for wash extrusion screw 121 and feed cylinder 110.

Referring to fig. 2, 5 and 6, fig. 6 is a schematic diagram of an air blowing block 320 in a 3D printer according to the present invention. In one embodiment, the 3D printer includes a refrigeration mechanism 300, the refrigeration mechanism 300 includes a refrigerator 310, a gas pipe connector 321, and a blowing block 320, one end of the gas pipe connector 321 is communicated with a gas outlet end of the refrigerator 310, the blowing block 320 is disposed at one side of the nozzle 111, a gas outlet 328 and a gas outlet 324 are disposed in the blowing block 320, the gas outlet 328 and the gas outlet 324 are communicated with each other, the other end of the gas pipe connector 321 is communicated with the gas outlet 324, and the gas outlet 328 is used for guiding out cold gas.

Specifically, the cold air is generated by the refrigerator 310 and guided into the air pipe connector 321, and since the air outlet 328 is communicated with the through hole 324, the cold air in the air pipe connector 321 flows into the air outlet 328 along the through hole 324 and flows onto the molten consumable extruded from the lower end of the nozzle 111 along the air outlet 328, so that the molten consumable is cooled rapidly and is formed.

Further, the refrigerating mechanism 300 includes a blow mount 330, an upper end of the blow mount 330 is connected to an outer wall of the main body member 131 in a region where the second receiving section 113 is located, and a lower end of the blow mount 330 extends to a side of the nozzle 111 and is connected to the blow block 320. Since the body member 131 and the barrel 110 have the adaptive shape, the region of the second accommodating section 113 on the body member 131 is also tapered downward along the vertical direction, and the blowing block 320 can extend to one side of the nozzle 111 accurately, so that the gas flowing out of the gas outlet can be guided out to the molten consumable extruded from the nozzle 111, thereby improving the cooling efficiency.

Referring to fig. 2 and 6, in one embodiment, the air blowing block 320 includes a first fixing plate 323 and a second fixing plate 327; the first fixing plate 323 comprises a through hole 324, the nozzle 111 penetrates through the first fixing plate 323, an annular cavity 325 arranged along the circumferential direction of the nozzle 111 is arranged on the first fixing plate 323, and the annular cavity 325 is communicated with the through hole 324; the second fixing plate 327 is connected to the first fixing plate 323, the plurality of air outlets 328 are annularly arranged, and the air outlets 328 are communicated with the annular chamber 325.

Specifically, the first fixing plate 323 is connected with the air blowing fixing frame 330. Because annular chamber 325 and via hole 324 switch on, then along the even distribution of the cold air that via hole 324 got into in the annular groove to derive along a plurality of ventholes 328 that the annular was arranged, make cold air can flow to the melting consumptive material along the circumference of nozzle 111 on, thereby improve the speed that the melting consumptive material can cool off, and can avoid cold air too big, influence the fashioned shape of melting consumptive material cooling. Preferably, the air outlets 328 are uniformly arranged, so that the cooling molding uniformity of the molten consumable material and the printing quality of the mold can be improved.

Further, the first fixing plate 323 is snap-fit with the second fixing plate 327, so that the second fixing plate 327 can be easily disassembled relative to the first fixing plate 323. The second fixing plate 327 can be easily repaired and replaced when the air outlet is blocked.

Further, the first fixing plate 323 has a first avoiding hole 326, the second fixing plate 327 has a second avoiding hole 329, the nozzle 111 passes through the first and second avoiding

holes

326 and 329, and the first and second avoiding

holes

326 and 329 are used to avoid the nozzle 111.

Referring to fig. 7, fig. 7 is a schematic view of a platform mechanism 400 in a 3D printer according to the present invention. In one embodiment, the platform mechanism 400 includes a printing platform 410 and a first driving assembly 420, the printing platform 410 is disposed below the extrusion mechanism 100, the printing platform 410 is connected to a power output end of the first driving assembly 420, and the first driving assembly 420 is configured to drive the printing platform 410 to move in a vertical direction.

Specifically, the first driving assembly 420 drives the printing platform 410 to move in the vertical direction, so that the printing platform 410 can move in the vertical direction relative to the extrusion mechanism 100, and further the nozzle 111 can extrude the consumables above the printing platform 410.

Further, the first driving assembly 420 includes a first driving member 421, a screw 422, a guide rod 423 and a sliding block 424; the screw 422 is connected to the power output end of the first driving member 421, the screw 422 extends along the vertical direction, the slider 424 is in threaded connection with the screw 422, the slider 424 is connected to the printing platform 410, the guide rods 423 and the screw 422 are arranged at intervals along the first direction, and the guide rods 423 are arranged in the slider 424 in a penetrating manner. When the first driving member 421 drives the screw 422 to rotate, since the sliding block 424 is rotatably connected to the guide rod 423, the sliding block 424 does not rotate synchronously with the screw 422, the sliding block 424 and the screw 422 are in threaded transmission, the sliding block 424 moves in the vertical direction, and the printing platform 410 and the sliding block 424 move synchronously.

Referring to fig. 5, 7 and 8, fig. 7 is a schematic diagram of a platform mechanism 400 in a 3D printer according to the present invention; fig. 8 is a partial schematic view of a platform mechanism 400 in a 3D printer according to the present invention. In one embodiment, the platform mechanism 400 further includes a supporting plate 430 and an adjusting member 440, the adjusting member 440 is connected to the supporting plate 430, one end of the adjusting member 440 is connected to the printing platform 410, and the other end passes through the supporting plate 430; the adjusting member 440 is rotated to adjust the distance between the printing platform 410 and the supporting plate 430.

Specifically, the supporting plate 430 is connected to the sliding block 424, one end of the adjusting member 440 is rotatably connected to the printing platform 410, the adjusting member 440 is connected to the supporting plate 430 by the screw threads 1223, and when the adjusting member 440 is rotated, the adjusting member 440 and the supporting plate 430 are driven by the screw threads 1223, so that the distance between the adjusting key and the supporting plate 430 is changed. Since the supporting plate 430 is connected to the sliding block 424, the height of the printing platform 410 is changed, and thus the height of the printing platform 410 is adjusted. Preferably, the number of the adjusting members 440 is four, and the adjusting members are respectively disposed at four corners of the printing platform 410. The first driving member 421 is a motor.

Further, be equipped with on print platform 410 and leak material hole 412, platform mechanism 400 includes material leaking barrel 411, and material leaking barrel 411 switches on with material leaking hole 412 to can retrieve remaining consumptive material on print platform 410.

Furthermore, a supporting column 460 corresponding to the adjusting member 440 is disposed on the supporting plate 430, the adjusting member 440 passes through the supporting column 460, and the screw 1223 is connected to the supporting column 460. Wherein, the support column 460 is sleeved with a buffer member, so that the printing platform 410 can be more stable when moving relative to the support plate 430. Preferably, the buffer is silicone.

In one embodiment, the platform mechanism 400 further includes a panel positioning member 450, an end of the adjusting member 440 away from the supporting plate 430 is rotatably connected to the panel positioning member 450, and the printing platform 410 is mounted on the panel positioning member 450, so as to facilitate replacement of the printing platform 410.

Referring to fig. 5 and 9, fig. 9 is a schematic diagram of a moving mechanism 200 in a 3D printer according to the present invention; the moving mechanism 200 includes a second driving assembly 210 and a third driving assembly 220; the power output end of the second driving assembly 210 is connected to the extruding mechanism 100, and the second driving assembly 210 is used for driving the extruding mechanism 100 to move along a first direction; the power output end of the third driving assembly 220 is connected to the second driving assembly 210, and the third driving assembly 220 is configured to drive the second driving assembly 210 to move along a second direction, where any two of the first direction, the second direction and the vertical direction are perpendicular to each other. For convenience of description, XX ' in fig. 5 in the specification is defined as a vertical direction, YY ' is defined as a first direction, ZZ ' is defined as a second direction, and the first direction and the second direction are described below.

Specifically, the second driving assembly 210 is configured to drive the extrusion mechanism 100 to move in a first direction, and the third driving assembly 220 is configured to drive the second driving assembly 210 to move in a second direction, so as to realize movement of the extrusion mechanism 100 in a horizontal direction, so that the extrusion mechanism 100 can print above the printing platform 410.

Referring to fig. 9, in one embodiment, the second driving assembly 210 includes a second driving member, a driving wheel 212, a rotating wheel and a timing belt, the rotating wheel and the driving wheel 212 are spaced apart in a first direction, the driving wheel 212 is connected to a power output end of the second driving member, the driving wheel 212 and the rotating wheel tension the timing belt, and the supporting assembly 130 is connected to the timing belt. The second driving member is used for driving the driving wheel 212 to rotate, and the rotating wheel and the driving wheel 212 rotate synchronously through the transmission of the synchronous belt, so that the synchronous belt performs semi-closed annular motion along the first direction, thereby driving the extrusion mechanism 100 to move along the first direction. Wherein the second driving member is a motor.

Referring to fig. 9, in one embodiment, the third driving assembly 220 includes a third driving member, a driving wheel 221, a driven wheel 222 and a transmission belt 223, the driving wheel 221 and the driven wheel 222 are spaced apart in the second direction, the driving wheel 221 is connected to a power output end of the third driving member, the driving wheel 221 and the driven wheel 222 tension the transmission belt 223, and the second moving member is connected to the synchronization belt. The third driving member is used for driving the driving wheel 221 to rotate, the driven wheel 222 and the driving wheel 221 rotate synchronously through transmission of the conveying belt 223, and then the conveying belt 223 makes a semi-closed annular motion along the second direction, so that the second moving member is driven to move along the second direction.

Further, the 3D printer includes a frame 230, and the third driving element, the driving wheel 221, and the driven wheel 222 are all mounted on the frame 230. The second driving assembly 210 comprises a connecting member 224, the connecting member 224 is connected to the conveyor belt 223, and the second driving member, the driving wheel 212 and the rotating wheel are mounted on the connecting member 224.

Referring to fig. 2, 5 and 10, fig. 10 is a schematic diagram of a 3D printer according to the present invention. In one embodiment, the 3D printer includes a housing 500 and a material guiding tube 140, the platform mechanism 400, the moving mechanism 200 and the extrusion mechanism 100 are all disposed in the housing 500, the material guiding tube 140 is disposed at one side of the extrusion mechanism 100, a material feeding hole 510 is disposed on an upper wall of the housing 500, the material guiding tube 140 is communicated with the material feeding hole 510, and the moving mechanism 200 can drive the extrusion mechanism 100 to move to one side of a discharging end of the material guiding tube 140.

Specifically, the housing 500 is a fully closed mechanism, so that the inside of the 3D printer is not interfered by the environment, and the inside is kept clean. When the controller detects that the material in the material guiding tube 110 is short, the controller can control the second driving member and the third driving member, so that the extruding mechanism 100 can move to the discharging end of the material guiding tube 140, and then the consumable material is introduced from the material feeding hole 510, and the consumable material enters the material guiding tube 110 along the material guiding tube 140.

Referring to fig. 5, in one embodiment, at least a portion of the guide tube 140 near the discharge end is inclined with respect to the output shaft of the extrusion driving member 122 in the axial direction of the guide tube 140, and the discharge end of the guide tube 140 can extend above the opening of the barrel 110.

Specifically, at least a partial region of the material guiding tube 140 near the discharge end is disposed obliquely relative to the output shaft of the extrusion driving member 122, and the discharge end of the material guiding tube 140 can extend to the top of the opening of the material barrel 110, so that the material guiding tube 140 can avoid the extrusion driving member 122, thereby avoiding position interference, and the consumable can slide into the material barrel 110 along the material guiding tube 140 from the upper end of the material guiding tube 140, thereby realizing feeding of the material barrel 110.

Further, the material guiding pipe 140 includes a feeding end extending along a vertical direction, and a discharging end disposed obliquely with respect to the output shaft of the driving member, in the embodiment shown in fig. 5, that is, the material guiding pipe 140 is approximately "L" shaped, the upper half portion extends along the vertical direction, and the lower half portion is inclined with respect to the vertical direction. In other embodiments, the feeding end is disposed obliquely with respect to the output shaft of the extrusion driver 122, i.e. the entire material guiding tube 140 is a straight tube and the entire material guiding tube is inclined with respect to the output shaft of the extrusion driver 122, as long as the material guiding for the barrel 110 can be realized.

Referring to fig. 5 and 10, in one embodiment, the 3D printer includes a fan 520, the fan 520 is disposed in the housing 500, and the fan 520 is used to form an air channel in the housing 500. Specifically, fan 520 is installed in frame 230, because shell 500 is totally closed structure, then fan 520 can be in the inside wind channel that forms of shell 500 after opening, the inside circulation of air of shell 500 of being convenient for, then at 3D printer during operation, is favorable to the inside cooling of shell 500, improves and prints the shaping effect.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An extrusion mechanism, comprising:

2. The extrusion mechanism of claim 1, wherein the bottom end of the extrusion screw is tapered, the radial dimension of the tapered surface decreases downward in the vertical direction, and the screw thread of the extrusion screw extends to the bottom end of the extrusion screw.

3. The extrusion mechanism of claim 2, wherein a gap is provided between the bottom wall of the receiving cavity and the tapered surface.

4. The extrusion mechanism of claim 1 wherein the housing chamber further comprises a fourth housing section, an upper end of the fourth housing section being in communication with the third housing section, a lower end of the fourth housing section being in communication with the nozzle, a radial dimension of the fourth housing section decreasing downward in a vertical direction.

5. The extrusion mechanism of claim 1 wherein the extrusion drive assembly comprises an extrusion drive member, a first adaptor, and a second adaptor;

6. The extrusion mechanism of claim 5, wherein the second adaptor includes a receiving groove with an upward opening, the limiting groove and the guide groove are disposed on a sidewall of the receiving groove, the first adaptor further includes a fixing block, the limiting arm is connected to the fixing block, and the fixing block is in clearance fit with the sidewall of the receiving groove; when the first adapter piece and the second adapter piece are relatively close to each other, the fixing block can slide into the accommodating groove.

7. The extrusion mechanism as recited in claim 6, further comprising an elastic member, wherein the elastic member is accommodated in the accommodating groove, a lower end of the elastic member abuts against a bottom wall of the accommodating groove, and an upper end of the elastic member abuts against the fixing block.

8. The extrusion mechanism of claim 1, wherein the extrusion mechanism comprises:

a wall scraper connected to the extrusion screw;

9. A 3D printer comprising the extrusion mechanism of any one of claims 1 to 8, further comprising a stage mechanism and a moving mechanism; the platform mechanism is arranged below the extrusion mechanism, and the platform mechanism and the extrusion mechanism can move relatively along the vertical direction; the power output end of the moving mechanism is connected with the extruding mechanism, and the moving mechanism is used for driving the extruding mechanism to move along the horizontal direction.

10. The 3D printer according to claim 9, wherein the 3D printer comprises a refrigerating mechanism, the refrigerating mechanism comprises a refrigerator, a gas pipe connector and a blowing block, one end of the gas pipe connector is communicated with a gas outlet end of the refrigerator, the blowing block is arranged on one side of the nozzle, a gas outlet hole and a conducting hole which are communicated with each other are formed in the blowing block, the other end of the gas pipe connector is communicated with the conducting hole, and the gas outlet hole is used for guiding out cold gas.

11. The 3D printer of claim 10, wherein the air-blowing block comprises:

12. The 3D printer of claim 9, wherein the platform mechanism further comprises a printing platform, a support plate, and an adjustment member,

the printing platform is arranged below the extrusion mechanism, the adjusting piece is connected with the supporting plate, one end of the adjusting piece is connected with the printing platform, and the other end of the adjusting piece penetrates through the supporting plate; the adjusting piece rotates to adjust the distance between the printing platform and the supporting plate.

13. The 3D printer according to claim 9, wherein the 3D printer comprises a housing and a material guiding pipe, the stage mechanism, the moving mechanism and the extruding mechanism are all disposed in the housing, the material guiding pipe is disposed on one side of the extruding mechanism, a material feeding hole is disposed on an upper wall of the housing, the material guiding pipe is communicated with the material feeding hole, and the moving mechanism can drive the extruding mechanism to move to one side of a discharging end of the material guiding pipe.