CN114083793B

CN114083793B - Extrusion mechanism and 3D printer

Info

Publication number: CN114083793B
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: 2024-05-17
Anticipated expiration: 2041-10-18
Also published as: CN114083793A

Abstract

The invention relates to an extrusion mechanism and a 3D printer. The extrusion mechanism comprises a charging barrel, an extrusion screw and an extrusion 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 gradually decreases 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 to the extrusion screw. Because the accommodation space that can hold the melting consumable reduces, then the pressure that the consumable of below received can be bigger, is favorable to the consumable to flow downwards, and the cross-sectional area in the second accommodation section reduces gradually for the pressure that the consumable received increases gradually, thereby avoids nozzle mouth department putty and outage, makes the consumable 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

3D printing technology based on FDM (Fused Deposition Modeling, process fused deposition manufacturing) is to heat and fuse solid plastic wires into liquid consumable materials, then extrude the liquid consumable materials out through nozzles, print the liquid consumable materials layer by layer on a workbench, stack the liquid consumable materials to form a certain shape, and cool the stacked liquid consumable materials to solidify and form. In the food 3D printing process, the in-process of extruding and printing is carried out, and food consumables need be in a molten state in the extrusion and printing process, and have certain viscosity and concentration, so that the phenomenon of blocking and breaking of the extrusion port is easy to occur.

Disclosure of Invention

Based on the above, it is necessary to provide an extrusion mechanism for solving the technical problems that the extrusion port of the food printer on the market is easy to be blocked and broken.

An extrusion mechanism, comprising:

the feeding barrel is provided with a containing cavity, the containing cavity comprises a first containing section, a second containing section and a third containing section which are sequentially distributed from top to bottom, the nozzle is communicated with the third containing section, the radial size of the first containing section is not smaller than that of the second containing section, the radial size of the second containing section is not smaller than that of the third containing section, and the radial size of the second containing section is gradually reduced downwards along the vertical direction;

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

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

In one embodiment, the bottom end of the extrusion screw is tapered, the radial dimension of the tapered surface gradually decreases 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 provided between the bottom wall of the accommodating cavity and the conical surface.

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

In one embodiment, the push drive assembly includes an extrusion drive, a first adapter, and a second adapter;

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

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

In one embodiment, the second adaptor comprises an accommodating groove with an upward opening, the limiting groove and the guiding 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, the fixing block can slide into the accommodating groove.

In one embodiment, the extrusion mechanism further includes an elastic member, 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.

In one embodiment, the extrusion mechanism comprises:

A scraper connected to the extrusion screw;

The first detector is arranged above the charging barrel and is used for detecting the height of consumable materials in the charging barrel;

The second detector is arranged above the charging barrel and is used for detecting the 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 the preset position, the first detector is in a trigger state, and the second detector is in a non-trigger state.

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

The 3D 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, an air pipe connector and an air blowing block, one end of the air pipe connector is communicated with an air outlet end of the refrigerator, the air blowing block is arranged on one side of the nozzle, an air outlet hole and a conducting hole which are mutually communicated are arranged in the air blowing block, the other end of the air pipe connector is communicated with the conducting hole, and the air outlet hole is used for guiding out cold air.

In one embodiment, the blowing block includes:

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

The second fixed plate comprises air outlet holes, the second fixed plate is connected with the first fixed plate, a plurality of air outlet holes are annularly distributed, 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, wherein 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 is rotated to adjust the distance between the printing platform and the supporting plate.

In one embodiment, the 3D printer comprises a housing and a material guiding pipe, the table mechanism, the moving mechanism and the extruding mechanism are all arranged in the housing, the material guiding pipe is arranged on one side of the extruding mechanism, a feeding hole is formed in the upper wall of the housing, the material guiding pipe is communicated with the feeding hole, and the moving mechanism can drive the extruding mechanism to move to one side of the discharging end of the material guiding pipe.

The beneficial effects are that:

The invention provides an extrusion mechanism which comprises a charging barrel, an extrusion screw and an extrusion 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 dimension of the first accommodating section is not smaller than that of the second accommodating section, the radial dimension of the second accommodating section is not smaller than that of the third accommodating section, and the radial dimension of the second accommodating section gradually decreases downwards along the vertical direction; the extrusion screw rod is accommodated in the accommodating cavity, extends to the third accommodating section, and gradually increases in bottom diameter along the vertical direction; the power output end of the pushing driving assembly is connected to the extrusion screw rod, and the pushing driving assembly is used for driving the extrusion screw rod to rotate. When the extrusion screw rotates, the molten consumable in the charging barrel is pushed downwards, so that the molten consumable gradually flows towards the outlet. Because the radial dimension of the first accommodation section is not less than the radial dimension of the second accommodation section, the radial dimension of the second accommodation section is not less than the radial dimension of the third accommodation section, namely, the accommodation space capable of accommodating the molten consumable is reduced, therefore, in the vertical direction, the pressure on the molten consumable in a narrower area below can be larger, the downward flow of the consumable is facilitated, and the cross-sectional area capable of accommodating the consumable in the second accommodation section is gradually reduced, so that the pressure on the molten consumable is gradually increased, the downward flow velocity of the molten consumable is gradually increased, the flow of the molten consumable is facilitated, and the probability that the consumable can not smoothly flow downwards due to accumulation at the inlet of the nozzle can be reduced. After the blocking probability is reduced, the probability of incontinuous consumable ejection caused by blocking of the nozzle inlet is correspondingly reduced, and the consumable can be extruded from the nozzle more stably.

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 the 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 according to the present invention;

fig. 5 is an internal schematic diagram of the 3D printer provided by the present invention;

Fig. 6 is a schematic diagram of an air blowing block in a 3D printer according to the present invention;

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

FIG. 8 is a schematic view of a portion of a platform mechanism in a 3D printer according to the present invention;

fig. 9 is a schematic diagram of a moving mechanism in a 3D printer according to the present invention;

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

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" 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 are used herein for illustrative purposes only and are not meant to be the only 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 diagram of an extrusion mechanism 100 provided by the present invention. An embodiment of the present invention provides an extrusion mechanism 100, which includes a barrel 110, an extrusion screw 121, and an extrusion driving assembly 120; the charging barrel 110 is provided with a containing cavity, the containing cavity comprises a first containing section 112, a second containing section 113 and a third containing section 114 which are sequentially distributed from top to bottom, the nozzle 111 is communicated with the third containing section 114, the radial dimension of the first containing section 112 is not smaller than that of the second containing section 113, the radial dimension of the second containing section 113 is not smaller than that of the third containing section 114, and the radial dimension of the second containing section 113 is gradually reduced downwards along the vertical direction; the extrusion screw 121 is accommodated in the accommodating cavity, and 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 extrusion driving assembly 120 is connected to the extrusion screw 121, and the extrusion driving assembly 120 is used for driving the extrusion 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. In the printing process, the 3D printer firstly holds the solid consumable in the accommodating cavity of the charging barrel 110, then heats the side wall of the charging barrel 110 through the heating element 150, so that the solid consumable is heated to form a molten state, and in the heating process, the extruding driving element drives the extruding screw 121 to rotate, so that the extruding screw 121 stirs and extrudes the consumable in the accommodating cavity, and the consumable in the molten state can be extruded from the nozzle 111 to print a model.

Specifically, when the extrusion screw 121 rotates, the molten consumable material in the barrel 110 is pushed downward, so that the molten consumable material gradually flows toward the outlet. The radial dimension of the first accommodating section 112 is not less than the radial dimension of the second accommodating section 113, the radial dimension of the second accommodating section 113 is not less than the radial dimension of the third accommodating section 114, that is, the accommodating space capable of accommodating the molten consumable is reduced, therefore, in the vertical direction, the pressure on the molten consumable in a narrower area below can be larger, the downward flow of the consumable is facilitated, and the cross-sectional area capable of accommodating the consumable in the second accommodating section 113 is gradually reduced, so that the pressure on the molten consumable is gradually increased, the downward flow velocity of the molten consumable is gradually increased, the flow of the molten consumable is facilitated, and the probability that the consumable is accumulated at the inlet of the nozzle 111 and cannot smoothly flow downwards can be reduced. After the blocking probability is reduced, the probability of incontinuous consumable parts ejected due to the blocking of the inlet of the nozzle 111 is correspondingly reduced, and the consumable parts can be extruded from the nozzle 111 more stably.

Further, the radial dimension of the third receiving section 114 is constant. Since the extrusion screw 121 is gradually changed, the outer diameter of the extrusion screw 121 is larger and larger 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 fully contacted with the side wall of the third accommodating section 114, and the heating effect of the heating element 150 on the consumable is improved.

Still further, the pushing device further includes a supporting component 130, the cartridge 110 is mounted on the supporting component 130, and the pushing driving member is connected to the supporting component 130 and located above the cartridge 110. The feed cylinder 110 top has the opening, and extrusion screw 121's upper end stretches out the opening, is connected in the power take off end of pushing away the drive piece, and extrusion screw 121's lower extreme stretches into in the feed cylinder 110, and extrusion screw 121 rotates through pushing away the drive of drive piece 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 channel 1224 of the extrusion screw 121 tapers downward in the vertical direction.

Specifically, the extrusion screw 121 pushes the consumable in the screw groove 1224 downward during rotation, and since the depth of the screw groove 1224 of the extrusion screw 121 is gradually reduced, the granular solid heated in the screw groove 1224 and pushed forward by the extrusion screw 121 can be gradually compacted and converted into a continuous melt, so that continuous delivery of the consumable can be ensured. Meanwhile, the depth of the screw groove 1224 of the extrusion screw 121 is gradually reduced, so that the conveying flow of the consumable is gradually reduced, and the phenomenon that the molten consumable is accumulated on the nozzle 111 to cause the nozzle 111 to be blocked can be avoided to a certain extent.

Referring to fig. 1, in one embodiment, the cross-sectional area of the last slot 1224 is adapted to the cross-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 is the same as the volume of the consumable extruded from the nozzle 111 in unit time, so that it can be avoided to a certain extent that when the volume of the consumable extruded from the lower end of the extrusion screw 121 is greater than the volume of the consumable extruded from the nozzle 111 in unit time, the nozzle 111 port cannot be timely extruded with the consumable to cause the nozzle 111 port to be blocked, and when the volume of the consumable extruded from the lower end of the extrusion screw 121 in unit time is less than the volume of the consumable extruded from the nozzle 111, no consumable is extruded from the nozzle 111 port to be broken.

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

Specifically, since the bottom end of the extrusion screw 121 is tapered 1225, after the consumable in a molten state is conveyed to the bottom end of the extrusion screw 121 by the screw groove 1224, the tapered 1225 can continuously stir the molten consumable, and to some extent, prevent the consumable from stagnating too long and having agglomerated and solidified when it does not reach the nozzle 111. Simultaneously conical surface 1225 can play the guide effect for from the terminal melting consumable of extrusion screw 121 can slide along conical surface 1225, thereby can avoid to a certain extent that the melting consumable piles up in extrusion screw 121 lower extreme and is located one side of the third section 114 inner wall that holds, make extrusion screw 121 lower extreme be located the melting consumable of one side of the third section 114 inner wall that holds can flow to central region, thereby be convenient for the melting consumable be pushed to nozzle 111 mouth. Because the radial dimension of the conical surface 1225 gradually decreases downwards along the vertical direction, the molten consumable can stably slide along the outer wall of the conical surface 1225, and stable input of the molten consumable is facilitated.

Further, the nozzle 111 is located the below of the pointed end of conical surface 1225 to make the outer wall that melts the consumable that can be stable slide to the pointed end along conical surface 1225, and then be carried to the top of nozzle 111, then through the extrusion of top melts the consumable, the consumable that melts can be accurate is pushed into the nozzle 111 mouth in, and then is convenient for the nozzle 111 extrude the consumable, realizes 3D printing.

Still referring 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 formed between the bottom wall of the accommodating cavity and the tapered surface 1225, the molten consumable material 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 material reaches the bottom wall of the cartridge 110, the impact force to the bottom wall of the cartridge 110 is small, and the bottom wall of the cartridge 110 is not easily severely worn due to the strong impact state for a long time. In addition, because the consumable is less to diapire impact force, correspondingly, the reaction force that the bottom wall was applyed in the consumable is also less, and the consumable is difficult for causing serious reverse impact to the consumable of top after bumping the bottom wall, and then makes the melting consumable can be stable extrude from nozzle 111.

Referring to fig. 1 and 3, in one embodiment, the receiving chamber further includes a fourth receiving section 115, an upper end of the fourth receiving section 115 communicates with the third receiving chamber, a lower end of the fourth receiving section 115 communicates with the nozzle 111, and a radial dimension of the fourth receiving section 115 gradually decreases downward in a vertical direction.

Specifically, a gap 1226 is located between the bottom wall of the fourth receiving segment 115 and the tapered surface 1225. As the radial dimension of the fourth receiving section 115 tapers downwardly in a vertical direction, the consumable material located within the gap 1226 is subjected to a downward force by the fourth receiving section 115, thereby facilitating the consumable material within the gap 1226 to flow downwardly along the sidewall of the fourth receiving section 115. Since the lower end of the fourth receiving section 115 communicates with the nozzle 111, the consumable in the gap 1226 can flow down the sidewall of the fourth receiving section 115 to the nozzle 111, thereby facilitating the extrusion of molten consumable by the nozzle 111.

With continued reference to fig. 1, in one embodiment, a portion of the flight 1223 on the extrusion screw 121 is located above the second receiving section 113.

Specifically, since the partial screw 1223 on the extrusion screw 121 is located above the second accommodating section 113, the extrusion screw 121 can stir the consumable in the second accommodating section 113 and drive the molten consumable located in the larger accommodating space above the second accommodating section 113 to the lower position of the second accommodating section 113 in the smaller accommodating space, so that the pressure to which the molten consumable is subjected becomes large, and the molten consumable is convenient to flow downwards.

With continued reference to FIG. 1, in one embodiment, the outer diameters of the extrusion screws 121 are equal, and the outer diameter of the extrusion screws 121 and the inner wall fit gap 1226 of the third receiving segment 114 are

Specifically, because the extrusion screw 121 cooperates with the gap 1226 of the third accommodating section 114, most of the solid consumable material with larger volume cannot fall into the third accommodating section 114, so that the risk of blocking the nozzle 111 due to incomplete melting of the solid consumable material with larger volume in the stirring and pushing processes of the extrusion screw 121 can be reduced.

Further, the heating member 150 is mounted to the support assembly 130 so as to transfer heat on the support assembly 130 to the cartridge 110 by heat radiation. Because extrusion screw 121 cooperates with third section 114 clearance 1226 that holds, then be located third section 114 that holds the consumable that can be abundant with feed cylinder 110 wall contact to make the consumable that is located third section 114 that holds can be abundant heat, guarantee self molten state, and then be convenient for by extrusion screw 121 to push to nozzle 111 mouth.

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 mounted on the support assembly 130 at a position corresponding to the second receiving section 113, the consumable material located at the second receiving section 113 can receive more heat, thereby enabling to accelerate the melting. Because the partial screw 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 the heat source can diffuse 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 the too low temperature, and the outer region cannot be liquefied due to the too high temperature.

Referring to fig. 1, 3 and 4, fig. 4 is a schematic view of a portion of an extrusion driving assembly in an extrusion mechanism 100 according to the present invention. In one embodiment, the push drive assembly 120 includes an extrusion drive 122, a first adapter 123, and a second adapter 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 one is provided with a guiding slot 1243 and a limiting slot 1242 which are mutually communicated; when the second adaptor 124 is relatively close to the first adaptor 123, the limiting arm 1232 can slide into the limiting groove 1242 along the guiding groove 1243; when the second adaptor 124 rotates relative to the first adaptor 123, the limiting arm 1232 can slide along the limiting groove 1242 to a 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 disassembled, the second adaptor 124 and the first adaptor 123 are relatively rotated, so that the limiting arm 1232 is moved from the locking position to the end of the limiting groove 1242, which is in communication with the guiding groove 1243, and 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 guiding groove 1243, thereby realizing the separation of the extrusion screw 121 and 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 connection 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 adapter 124 is separated from the first adapter 123. The extrusion driving member 122 is located above the barrel 110, so when the extrusion screw 121 is removed, the extrusion screw 121 needs to be inclined relative to the vertical direction, so that the upper end of the extrusion screw 121 can be staggered with respect to the extrusion driving member 122 and removed from the opening of the barrel 110, thereby facilitating cleaning of the extrusion driving member 122 and the barrel 110.

Further, the locking position is an end of the limit 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 the end of the limiting groove 1242 away from the guiding groove 1243 and abuts against the inner wall of the limiting groove 1242, thereby limiting 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 other connecting structures such as bearings are not arranged between the extrusion screw 121 and the barrel 110, the extrusion screw 121 is suspended on the extrusion driving member 122, and the upper wall of the locking position abuts against the upper side of the limiting arm 1232 due to the gravity of the extrusion screw 121, so that the movement of the limiting arm 1232 along the vertical direction is limited. The extrusion screw 121 rotates in synchronization with the extrusion driver 122 as the extrusion driver 122 rotates.

It should be noted that, when the power output shaft of the extrusion driving member 122 is in operation, the rotating direction is the same as the direction in which the limiting arm 1232 slides from the communication position between 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 tightly support the limiting arm 1232, so as to avoid the limiting arm 1232 from sliding reversely relative to the limiting groove 1242. Preferably, the limiting 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 groove 1241 with an upward opening, the limiting groove 1242 and the guiding groove 1243 are disposed on a side wall of the accommodating groove 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 matched with the side wall gap 1226 of the accommodating groove 1241; the fixing block 1231 can slide into the accommodating groove 1241 when the first adapter 123 and the second adapter 124 are relatively close.

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 has a cylindrical shape, 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 groove 1241 and is always accommodated in the accommodating groove 1241.

Further, the limiting groove 1242 and the guiding groove 1243 are disposed on the side wall of the accommodating groove 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 grooves 1243 is two, and the two limiting arms 1232 slide into the limiting grooves 1242 along the corresponding guide grooves 1243 respectively and slide into the locking positions through the limiting grooves 1242, so that the limiting arms 1232 are stably locked at the locking positions, and the second adapter 124 and the first adapter 123 are stably connected. The number of the stopper grooves 1242 and the guide grooves 1243 may be one, as long as the stopper arm 1232 is locked.

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

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

Specifically, the guide groove 1243 has an upward opening. When the second adaptor 124 approaches the first adaptor 123, the limiting arm 1232 extends into the guiding groove 1243 from the opening of the guiding groove 1243, and can slide into the limiting groove 1242 along the guiding groove 1243. Since the guide groove 1243 radially penetrates the groove wall of the accommodating groove 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 slots 1243 do not extend radially through the slot walls of the receiving slots 1241, so long as the guiding of the stop arms 1232 is enabled. The limiting groove 1242 does not penetrate the groove wall of the accommodating groove 1241 in the radial direction, as long as the limiting of the limiting arm 1232 can be achieved.

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

Specifically, when the fixing block 1231 slides into the accommodation groove 1241, the lower end of the fixing block 1231 abuts against the elastic member 125. When the limiting arm 1232 slides along the guiding groove 1243 to the limiting groove 1242, the fixing block 1231 and the limiting arm 1232 move synchronously, and the elastic member 125 is compressed by the downward pressure of the fixing block 1231. 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 pushing force, 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 from reversely sliding out of the limiting groove 1242. Wherein the elastic member 125 is a spring.

Referring to fig. 4, in one embodiment, a side wall of the accommodating groove 1241 is provided with a locking groove 1244, the locking groove 1244 is communicated with the limiting groove 1242, the dimension of the locking groove 1244 along the vertical direction is larger than that of the limiting groove 1242 along the vertical direction, and a step surface 1245 is formed at the joint of the locking groove 1244 and the 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 along the limiting groove 1242 to the locking groove 1244, so as to lock the first adapter 123 and the second adapter 124, and the step surface 1245 is used for limiting the limiting arm 1232 to slide reversely and withdraw from the locking groove 1244.

Specifically, the locking position is located in the locking groove 1244. When the first adapting piece 123 rotates relatively to the second adapting piece 124, the limiting arm 1232 can slide to the locking groove 1244 along the limiting groove 1242, and the fixing block 1231 drives the limiting arm 1232 to move upwards due to the upward pushing force of the elastic piece 125, so that the upper end of the limiting arm 1232 abuts against the upper end of the locking groove 1244, and the limiting arm 1232 moves in the vertical direction. Because the size of the locking groove 1244 along the vertical direction is greater than the size of the limiting groove 1242 along the vertical direction, and the junction of the locking groove 1244 and the upper end of the limiting groove 1242 forms the step surface 1245, one side of the limiting arm 1232 is abutted against the step surface 1245, and the other side is abutted against the end wall of the locking groove 1244, so that the two sides of the limiting groove 1242 along the horizontal direction are limited, and therefore, the limiting arm 1232 is stably locked in the locking groove 1244, so that the first adapter 123 and the second adapter 124 are stably connected.

When the first adaptor 123 and the second adaptor 124 need to be disassembled, downward thrust is applied to the first adaptor 123, so that the elastic piece 125 is stressed and compressed, at this time, the limiting arm 1232 moves downward, and since one side of the limiting arm 1232 is not abutted against the step surface 1245, when the first adaptor 123 and the second adaptor 124 rotate relatively, the limiting arm 1232 can slide from the locking groove 1244 to the limiting groove 1242, and then slide to the communicating position between the limiting groove 1242 and the guiding groove 1243, when the second adaptor 124 is far away from the first adaptor 123 relatively, the limiting arm 1232 slides out along the guiding groove 1243, and then the first adaptor 123 is separated from the second adaptor 124.

Referring to fig. 1 and 4, in one embodiment, a mounting hole with a downward opening is provided at the lower end of the second adapter 124, the mounting hole is in communication with the accommodating groove 1241, the diameter of the mounting hole is smaller than the diameter of the accommodating groove 1241, and a step surface 1245 is formed at the connection between the mounting hole and the accommodating groove 1241; the upper end of the extrusion screw 121 extends into the accommodating groove 1241 from the mounting hole and is connected to the side wall of the mounting hole, the lower end of the elastic member 125 abuts against the step surface 1245, and the lower end of the elastic member 125 is sleeved on the extrusion screw 121.

Specifically, since the upper end of the extrusion screw 121 is extended into the mounting hole and is coupled to the sidewall of the mounting hole, the extrusion screw 121 is stably coupled with the second adaptor 124. Since the upper end of the extrusion screw 121 is extended into the receiving groove 1241 from the mounting hole, the lower end of the spring can be sleeved on the extrusion screw 121, thereby playing a guiding role in compression of the spring, so that the spring can exert a stable upward pushing force on the fixing block 1231.

Further, the extrusion mechanism 100 further includes a fastener 126, the side wall of the mounting hole is provided with a fastening hole 128, and the fastener 126 passes through the fastening hole 128 and abuts against the 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 synchronously rotate. Wherein the fastener 126 is a screw.

Still further, the extrusion mechanism 100 further includes a positioning member, the fixing block 1231 is provided with a connection hole 1233 and a positioning hole 1234, the connection hole 1233 extends in a vertical direction, the positioning hole 1234 is in communication with the connection hole 1233, and the positioning hole 1234 extends in a radial direction. The power output shaft of the extrusion driving piece 122 stretches into the connecting hole 1233, and the positioning piece passes through the positioning hole 1234 to be abutted against the side wall of the power output shaft, so that the first adapter piece 123 is stably connected with the fixed block 1231, and the extrusion driving piece 122 drives the first adapter piece 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 body member 131 and a swing door 132, one end of the swing door 132 is rotatably connected to the body member 131, and the other end of the swing door 132 is detachably connected to the body member 131; when the other end of the revolving door 132 is connected with the main body member 131, the revolving door 132 and the main body member 131 enclose a mounting cavity for mounting the cartridge 110.

Specifically, the extrusion drive member 122 is connected to the main body member 131. Because the other end of the revolving door 132 is detachably connected with the main body member 131, when the other end of the revolving door 132 is detached from the main body member 131, an opening is formed between the other end of the revolving door 132 and the main body member 131, and when the extrusion screw 121 is moved out of the barrel 110, the barrel 110 can be moved out of the opening, thereby facilitating cleaning of the barrel 110. After the second adaptor 124 is separated from the first adaptor 123, the extrusion screw 121 and the barrel 110 may be moved out of the support assembly 130 simultaneously, and the extrusion screw 121 may be moved out of the barrel 110.

Further, the extrusion mechanism 100 includes a hinge 133, 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. When one end of the swing door 132 is rotated relative to the body member 131, the other end of the swing door 132 has a larger opening with the body member 131, thereby facilitating removal of the cartridge 110 from the mounting cavity.

Still further, the extrusion mechanism 100 includes a clip 134 and a snap ring 135, the clip 134 is mounted to the main body 131, the snap ring 135 is mounted to the other end of the revolving door 132, and the snap ring 135 can rotate relative to the clip 134, thereby being engaged with or disengaged from the clip 134. The specific structures of the buckle 134 and the snap ring 135 are the prior art, and will not be described again.

Referring to fig. 1 and 2, in one embodiment, the extrusion mechanism 100 includes a scraper 127, a first detector 160, and a second detector 170; the scraper 127 is connected to the extrusion screw 121; the first detector 160 is installed above the cartridge 110, and the first detector 160 is used for detecting the height of consumable materials 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 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 the triggered state; if the scraper 127 rotates to deviate from the first position and the material level in the barrel 110 is lower than the preset position, the first detector 160 is in the triggered state, and the second detector 170 is in the non-triggered state.

Specifically, the wall scraper 127 is attached to the inner wall of the first accommodating section 112, and an end of the wall scraper 127 away from the extrusion screw 121 abuts against the inner wall of the first accommodating section 112. When the extrusion driving piece 122 drives the extrusion screw 121 to rotate, the wall scraper 127 and the extrusion screw 121 synchronously rotate, so that consumable materials adhered to the inner wall of the accommodating cavity can be scraped, and waste of the consumable materials is avoided.

If both the first detector 160 and the second detector 170 are in the triggered state, it cannot be determined that the triggering of the first detector 160 is caused by insufficient material or caused by the rotation of the scraper 127 to the first position. If the second detector 170 is in the non-triggering state, which indicates that the wall scraper 127 is not in the first position, then if the first detector 160 is in the triggering state, it can be ensured that the first detector 160 is triggered 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, so as to prompt the operator to timely feed. Preferably, the first detector 160 is a distance sensor and the second detector 170 is a proximity sensor. The first position is not a specific point, but an area within which it can be sensed by the corresponding sensor.

Referring to fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, fig. 5 is an internal schematic diagram of the 3D printer according to the present invention. The 3D printer provided by an embodiment of the present invention includes the extrusion mechanism 100 described above, and 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 relatively move along 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 relatively move in the vertical direction, so that the 3D printing mechanism can move above the platform mechanism 400, thereby enabling the extruding mechanism 100 to realize 3D printing.

According to the 3D printer, the containing space capable of containing the molten consumable is reduced, so that the pressure on the molten consumable in a narrower area below can be larger, the downward flow of the consumable is facilitated, the cross-sectional area of the consumable can be gradually reduced in the second containing section 113, the pressure on the molten consumable is gradually increased, the downward flow rate of the molten consumable is gradually increased, the flow of the molten consumable is facilitated, and the probability that the consumable is accumulated at the inlet of the nozzle 111 and cannot smoothly flow downwards is further reduced. And through first adaptor 123 and second adaptor 124 stable connection, and convenient to detach installs to make extrusion screw 121 can be stable realize stirring and push away the extrusion consumptive material, simultaneously can be convenient dismantle with extrusion drive piece 122, 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 the 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, an air pipe connector 321 and an air blowing block 320, one end of the air pipe connector 321 is communicated with an air outlet end of the refrigerator 310, the air blowing block 320 is arranged on one side of the nozzle 111, an air outlet hole 328 and a conducting hole 324 which are mutually communicated are arranged in the air blowing block 320, and the other end of the air pipe connector 321 is communicated with the conducting hole 324, and the air outlet hole 328 is used for guiding out cold air.

Specifically, cold air is generated by the refrigerator 310 and is led out into the air pipe joint 321, and because the air outlet hole 328 is communicated with the conducting hole 324, the cold air in the air pipe joint 321 flows into the air outlet hole 328 along the conducting hole 324 and flows onto the molten consumable extruded from the lower end of the nozzle 111 along the air outlet hole 328, so that the molten consumable is conveniently cooled quickly, and further formed.

Further, the refrigerating mechanism 300 includes a blowing holder 330, the upper end of the blowing holder 330 is connected to the outer wall of the region of the main body member 131 where the second receiving section 113 is located, and the lower end of the blowing holder 330 extends to one side of the nozzle 111 and is connected to the blowing block 320. Because the main body 131 and the charging barrel 110 have the adaptive shape, the area of the second accommodating section 113 on the main body 131 is also tapered downwards along the vertical direction, and the air blowing block 320 can accurately extend to one side of the nozzle 111, so that the air flowing out from the air outlet can be led out to the molten consumable extruded by the nozzle 111, and the cooling efficiency is improved.

Referring to fig. 2 and 6, in one embodiment, the blowing block 320 includes a first fixed plate 323 and a second fixed plate 327; the first fixed plate 323 includes a through hole 324, the nozzle 111 is disposed through the first fixed plate 323, the first fixed plate 323 is provided with an annular cavity 325 disposed along the circumferential direction of the nozzle 111, and the annular cavity 325 is in communication with the through hole 324; the second fixing plate 327 is connected to the first fixing plate 323, a plurality of air outlet holes 328 are arranged in a ring shape, and the air outlet holes 328 are communicated with the ring cavity 325.

Specifically, the first fixing plate 323 is connected with the air blowing fixing frame 330. Because annular cavity 325 switches on with via hole 324, then the air conditioning that gets into along via hole 324 can even distribution in the annular groove to derive along a plurality of ventholes 328 that the annular was arranged, make the air conditioning can follow the circumference of nozzle 111 and flow to on the melting consumable, thereby improve the speed that the melting consumable can be refrigerated, and can avoid the air conditioning too big, influence melting consumable cooling shaping's shape. Preferably, the air outlet holes 328 are uniformly arranged, so that the uniformity of cooling and molding of the molten consumable material and the printing quality of the model can be improved.

Further, the first fixing plate 323 is snap-fitted with the second fixing plate 327, so that the second fixing plate 327 can be easily detached from the first fixing plate 323. The second fixing plate 327 can be easily overhauled 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 avoiding hole 326 and the second avoiding hole 329, and the first avoiding hole 326 and the second avoiding hole 329 are used for avoiding the nozzle 111.

Referring to fig. 7, fig. 7 is a schematic diagram 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 used for driving the printing platform 410 to move along 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 extruding mechanism 100, and the nozzle 111 can extrude the consumable 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 slider 424; the lead screw 422 is connected to the power output end of the first driving member 421, the lead screw 422 extends along the vertical direction, the slider 424 is in threaded connection with the lead screw 422, the slider 424 is connected to the printing platform 410, the guide rod 423 and the lead screw 422 are arranged at intervals along the first direction, and the guide rod 423 is arranged in the slider 424 in a penetrating manner. When the first driving member 421 drives the screw 422 to rotate, the slider 424 is rotationally connected with the guide rod 423, so that the slider 424 does not rotate synchronously with the screw 422, the slider 424 is in threaded transmission with the screw 422, the slider 424 moves along the vertical direction, and the printing platform 410 moves synchronously with the slider 424.

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

Specifically, the support plate 430 is connected to the slider 424, one end of the adjusting member 440 is rotatably connected to the printing platform 410, and the screw 1223 of the adjusting member 440 is connected to the support plate 430, so that when the adjusting member 440 is rotated, the adjusting member 440 is driven by the screw 1223 of the support plate 430, thereby changing the distance between the adjusting key and the support plate 430. Since the support plate 430 is connected to the slider 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 they are respectively disposed at four corners of the printing platform 410. Wherein, the first driving member 421 is a motor.

Further, the printing platform 410 is provided with a material leakage hole 412, the platform mechanism 400 comprises a material leakage barrel 411, and the material leakage barrel 411 is communicated with the material leakage hole 412, so that the residual consumable on the printing platform 410 can be recovered.

Further, the support plate 430 is provided with a support column 460 corresponding to the adjusting member 440, the adjusting member 440 passes through the support column 460, and the screw 1223 is connected to the support 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 silica gel.

In one embodiment, the platform mechanism 400 further includes a panel positioning member 450, and an end of the adjusting member 440 remote from the support 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 that the printing platform 410 can be replaced conveniently.

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 drive assembly 210 and a third drive assembly 220; the power output end of the second driving assembly 210 is connected to the extrusion mechanism 100, and the second driving assembly 210 is used for driving the extrusion mechanism 100 to move along the 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, wherein 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 of the specification is defined as a vertical direction, YY ' is defined as a first direction, ZZ ' is defined as a second direction, and the description is given below with respect to the first direction and the second direction.

Specifically, the second driving assembly 210 is used to drive the extrusion mechanism 100 to move along the first direction, and the third driving assembly 220 is used to drive the second driving assembly 210 to move along the second direction, so as to realize the movement of the extrusion mechanism 100 in the 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 synchronous belt, the rotating wheel and the driving wheel 212 are arranged at intervals along the first direction, the driving wheel 212 is connected to the power output end of the second driving member, the driving wheel 212 and the rotating wheel tension the synchronous belt, and the supporting assembly 130 is connected to the synchronous belt. The second driving member is configured to drive 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 a semi-closed annular movement 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 belt 223, the driving wheel 221 and the driven wheel 222 are disposed at intervals along the second direction, the driving wheel 221 is connected to the power output end of the third driving member, the driving wheel 221 and the driven wheel 222 tension the belt 223, and the second moving member is connected to the timing belt. The third driving member is configured to drive the driving wheel 221 to rotate, and the driven wheel 222 and the driving wheel 221 rotate synchronously through the transmission of the conveying belt 223, so that the conveying belt 223 performs a semi-closed annular movement along the second direction, thereby driving the second moving member to move along the second direction.

Further, the 3D printer includes a frame 230, and the third driving member, the driving wheel 221, and the driven wheel 222 are all mounted on the frame 230. The second driving assembly 210 includes a connection member 224, the connection 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 connection 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 feeding tube 140, the platform mechanism 400, the moving mechanism 200 and the extrusion mechanism 100 are all disposed in the housing 500, the feeding tube 140 is disposed on one side of the extrusion mechanism 100, a feeding hole 510 is disposed on an upper wall of the housing 500, the feeding tube 140 is in communication with the feeding hole 510, and the moving mechanism 200 can drive the extrusion mechanism 100 to move to one side of a discharge end of the feeding tube 140.

Specifically, the housing 500 is a totally enclosed mechanism, so that the interior of the 3D printer is not disturbed by the environment, and the interior is kept clean. When the controller detects the shortage of the material in the material cylinder 110, the controller can control the second driving member and the third driving member, so that the extrusion mechanism 100 can move to the discharge end of the material guiding tube 140, and then the consumable is guided into the material cylinder 110 from the material feeding hole 510, and the consumable enters the material cylinder 110 along the material guiding tube 140.

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

Specifically, since at least a partial area of the material guiding tube 140 near the discharge end is inclined 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 upper portion of the opening of the material cylinder 110, the material guiding tube 140 can avoid the extrusion driving member 122, so that position interference is avoided, and consumable materials can slide into the material cylinder 110 along the material guiding tube 140 from the upper end of the material guiding tube 140, thereby realizing feeding of the material cylinder 110.

Further, the material guiding pipe 140 includes a feeding end, the feeding end extends in a vertical direction, the discharging end is inclined with respect to the output shaft of the driving member, and in the embodiment shown in fig. 5, the material guiding pipe 140 is approximately L-shaped, the upper half portion extends in a vertical direction, and the lower half portion is inclined with respect to the vertical direction. In other embodiments, the feed end is disposed obliquely to the output shaft of the extrusion drive 122, i.e., the entire guide tube 140 is entirely straight and the entire guide tube is inclined to the output shaft of the extrusion drive 122, so long as the guide of the cartridge 110 is enabled.

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 duct in the housing 500. Specifically, the fan 520 is mounted on the rack 230, and since the housing 500 is of a fully-closed structure, after the fan 520 is opened, an air duct can be formed inside the housing 500, so that air inside the housing 500 can circulate, and when the 3D printer works, the cooling inside the housing 500 is facilitated, and the printing forming effect is improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. An extrusion mechanism, comprising:

The feeding barrel is provided with a containing cavity, the containing cavity comprises a first containing section, a second containing section and a third containing section which are sequentially distributed from top to bottom, the nozzle is communicated with the third containing section, the radial size of the first containing section is not smaller than that of the second containing section, the radial size of the second containing section is not smaller than that of the third containing section, the radial size of the second containing section is gradually reduced downwards along the vertical direction, and the radial size of the third containing section is constant;

The extrusion screw is accommodated in the accommodating cavity, extends to the third accommodating section, gradually increases the bottom diameter of the extrusion screw downwards along the vertical direction, gradually decreases the depth of a screw groove of the extrusion screw downwards along the vertical direction, and adapts to the sectional area of the screw groove at the lowest end and the sectional area of the upper end of the nozzle; 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, the threads of the extrusion screw extend to the bottom end of the extrusion screw, and a gap is reserved between the bottom wall of the accommodating cavity and the conical surface;

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

3. The extrusion mechanism of claim 1, wherein the push drive assembly comprises an extrusion drive, a first adapter, and a second adapter;

4. The extrusion mechanism of claim 3, wherein the second adapter comprises an upwardly open receiving recess, the limiting slot and the guide slot are disposed on a sidewall of the receiving recess, the first adapter further comprises a fixed block, the limiting arm is connected to the fixed block, and the fixed block is in clearance fit with the sidewall of the receiving recess; when the first adapter piece and the second adapter piece are relatively close, the fixing block can slide into the accommodating groove.

5. The extrusion mechanism of claim 4, further comprising an elastic member accommodated in the accommodation groove, wherein a lower end of the elastic member abuts against a bottom wall of the accommodation groove, and an upper end of the elastic member abuts against the fixing block.

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

A scraper connected to the extrusion screw;

7. A 3D printer comprising the extrusion mechanism of any one of claims 1-6, further comprising a platform mechanism and a movement 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.

8. The 3D printer of claim 7, wherein the 3D printer comprises a refrigeration mechanism, the refrigeration mechanism comprises a refrigerator, an air pipe connector and an air blowing block, one end of the air pipe connector is communicated with an air outlet end of the refrigerator, the air blowing block is arranged on one side of the nozzle, an air outlet hole and a conducting hole which are communicated with each other are arranged in the air blowing block, the other end of the air pipe connector is communicated with the conducting hole, and the air outlet hole is used for guiding out cold air.

9. The 3D printer of claim 8, wherein the air blowing block comprises:

10. The 3D printer of claim 7, 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 is rotated to adjust the distance between the printing platform and the supporting plate.

11. The 3D printer of claim 7, wherein the 3D printer comprises a housing and a feed pipe, the table mechanism, the moving mechanism and the extruding mechanism are all arranged in the housing, the feed pipe is arranged at one side of the extruding mechanism, a feed hole is arranged on the upper wall of the housing, the feed pipe is communicated with the feed hole, and the moving mechanism can drive the extruding mechanism to move to one side of the discharge end of the feed pipe.