CN218054032U - Pushing device and 3D printing equipment - Google Patents

Abstract

The utility model relates to a push device and 3D printing apparatus. The pushing device comprises a frame, a central roller, an extrusion assembly and a driving assembly; the central roller is arranged on the rack, the extrusion assembly comprises a supporting plate, a first pressing wheel and a second pressing wheel, the supporting plate is connected with the driving assembly, the first pressing wheel and the second pressing wheel are both arranged on the supporting plate, and the first pressing wheel and the second pressing wheel are respectively positioned on two sides of the central roller; the driving assembly is used for driving the supporting plate to move so that the first pressing wheel or the second pressing wheel moves towards the central roller to reach respective corresponding extrusion positions, and one of the first pressing wheel and the second pressing wheel, which is located at the extrusion positions, and the central roller can rotate relatively to convey consumables. This application has realized the switching of two kinds of consumptive materials through a drive assembly and three wheel, compares in the structure that sets up two driving pieces and four wheels among the prior art, has reduced device part quantity in this application, reduces device occupation space, and then improves the flexibility and the printing precision of printing the shower nozzle.

Description

Pushing device and 3D printing equipment

Technical Field

The utility model relates to a 3D prints technical field, especially relates to pushing device and 3D printing apparatus.

Background

The 3D printing apparatus, also called three-dimensional printing apparatus, is an accumulation manufacturing technique, i.e. a machine of rapid prototyping technique, which is based on a digital model file, and manufactures a three-dimensional object by printing a layer of adhesive material by using a special wax material, a powdered metal or plastic, etc. which is adhesive material. In the current 3D printing apparatus who uses the dual spray head, set up two sets of wire feeders usually, corresponding two sets of driving pieces that set up for it is great to print the part quantity on the shower nozzle, and occupation space is great, thereby makes the migration distance who prints the shower nozzle receive the restriction, influences the printing precision.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a pushing device for solving the technical problems of large number of printing head components, large occupied space, limited moving distance and influence on printing precision.

A pushing device comprises a frame, a central roller, a squeezing assembly and a driving assembly; the central roller is mounted on the rack, the extrusion assembly comprises a support plate, a first pressing wheel and a second pressing wheel, the support plate is connected to the power output end of the driving assembly, the first pressing wheel and the second pressing wheel are mounted on the support plate, the first pressing wheel and the second pressing wheel are respectively positioned on two sides of the central roller along a horizontal first direction, and conveying spaces for consumable materials to pass through are formed between the central roller and the first pressing wheel and between the central roller and the second pressing wheel;

the driving assembly is used for driving the supporting plate to move along the horizontal first direction so as to enable the first pressing wheel or the second pressing wheel to move towards the central roller to reach respective corresponding extrusion positions, and one of the first pressing wheel and the second pressing wheel which is located at the extrusion position and the central roller can rotate relatively to convey the consumable materials at the corresponding positions.

In one embodiment, the pushing device further comprises a transmission assembly, the transmission assembly comprises a transmission block and a switching piece, the switching piece is connected to the power output end of the driving assembly, and the transmission block is arranged on the switching piece; the supporting plate is provided with a chute, the transmission block is inserted into the chute, and when the driving assembly drives the switching piece to move along the vertical direction, the transmission block pushes the chute wall of the chute so that the supporting plate drives the first pinch roller or the second pinch roller to move towards the central roller.

In one embodiment, the rack is provided with a first limiting groove extending along a horizontal first direction, the support plate is connected to a groove wall of the first limiting groove in a sliding manner, and the first limiting groove is used for limiting the support plate to move along a vertical direction.

In one embodiment, the pushing device includes a first limiting plate and a second limiting plate connected to the frame, the first limiting plate and the second limiting plate are disposed at intervals in a vertical direction, the first limiting groove is formed between the first limiting plate, the second limiting plate and the frame, and a stopper is disposed on the first limiting plate and/or the second limiting plate, and is configured to limit the support plate to move in a horizontal second direction, where the horizontal second direction is perpendicular to the horizontal first direction.

In one embodiment, the driving assembly includes a first driving member and a cam, the cam is connected to a power output end of the first driving member, a driving groove is formed in the cam, a matching block is arranged on the switching member, the matching block abuts against a groove wall of the driving groove, and the first driving member is used for driving the cam to drive the matching block to move in the vertical direction.

In one embodiment, a second limiting groove extending in the vertical direction is formed in the rack, the switching member is slidably connected to a groove wall of the second limiting groove, and the second limiting groove is used for limiting the switching member to move in a direction other than the vertical direction.

In one embodiment, the transmission assembly further comprises an elastic member and a lug; the convex block is connected with the switching piece, one end of the elastic piece is elastically abutted against the rack, the other end of the elastic piece is elastically abutted against the convex block, and the elastic piece is used for applying upward force to the convex block so that the side wall of the matching block is always abutted against the groove wall of the driving groove.

In one embodiment, the cam is provided with a first groove and a second groove, the first groove and the second groove are distributed along the circumferential direction of the cam, and the groove wall of the first groove and the groove wall of the second groove are in smooth transition;

when the matching block moves to abut against the groove wall of the first groove, the switching piece moves to the highest point, and when the matching block moves to abut against the groove wall of the second groove, the switching piece moves to the lowest point.

In one of them embodiment, the region between first pinch roller and the second pinch roller is equipped with dodges the hole in the backup pad, push away the device and still include the second driving piece, the output shaft of second driving piece passes dodge the hole and be connected to central gyro wheel, the second driving piece is used for driving central gyro wheel is around self axial rotation.

The utility model also provides a 3D printing apparatus can solve above-mentioned at least one technical problem.

A3D printing apparatus comprises the pushing device.

Has the advantages that:

the embodiment of the utility model provides a pushing device, which comprises a frame, a central roller, a squeezing component and a driving component; the central roller is arranged on the rack, the extrusion assembly comprises a supporting plate, a first pressing wheel and a second pressing wheel, the supporting plate is connected to the power output end of the driving assembly, the first pressing wheel and the second pressing wheel are both arranged on the supporting plate, the first pressing wheel and the second pressing wheel are respectively positioned on two sides of the central roller along the horizontal first direction, and conveying spaces for consumable materials to pass through are formed between the central roller and the first pressing wheel and between the central roller and the second pressing wheel; the driving assembly is used for driving the supporting plate to move along a horizontal first direction so as to enable the first pressing wheel or the second pressing wheel to move towards the central roller to reach respective corresponding extrusion positions, and one of the first pressing wheel and the second pressing wheel, which is located at the extrusion position, and the central roller can rotate relatively to convey consumables at the corresponding positions. Remove through drive assembly drive backup pad in this application, realize that first pinch roller or second pinch roller move towards central gyro wheel, make the distance between first pinch roller or second pinch roller and the central gyro wheel reduce, promptly carry the space to reduce, make the consumptive material extruded, and when one of them is close to central gyro wheel in first pinch roller and the second pinch roller, the central gyro wheel must be kept away from to the other one, thereby realize the switching of extrusion consumptive material, rotate with central gyro wheel through being in one of extrusion position in first pinch roller and the second pinch roller relatively, thereby realize that the consumptive material that is in the extrusion state is carried to in the shower nozzle, this application has realized the switching of two kinds of consumptive materials through a drive assembly and three wheel promptly, compare the structure that sets up two drive assemblies and four wheels in prior art, the quantity of device part has been reduced in this application, reduce device occupation space, and then improve the flexibility and the printing precision of printing shower nozzle.

The utility model provides a 3D printing apparatus, including foretell pushing device, can realize above-mentioned at least one technological effect.

Drawings

Fig. 1 is a schematic view of a pushing device provided by the present invention with a housing removed;

fig. 2 is a schematic view of a pushing device provided by the present invention;

fig. 3 is an exploded view of the pushing device provided by the present invention;

FIG. 4 is an enlarged view at B in FIG. 3;

FIG. 5 is an enlarged view at C in FIG. 3;

fig. 6 is an enlarged view of a point a in fig. 1.

Reference numerals: 110-a first showerhead module; 120-a second showerhead module; 150-throat pipe; 200-a pressing assembly; 210-a central roller; 220-a first pinch roller; 230-a second puck; 240-a support plate; 242-chute; 243-avoidance hole; 250-a second drive member; 260-a first limiting plate; 270-a second limiting plate; 280-a stop block; 300-a drive assembly; 310-a first driver; 320-a cam; 321-a first groove; 322-a second groove; 400-a transmission assembly; 410-a switch; 420-a transmission block; 430-an elastic member; 440-a bump; 441-a guide groove; 460-a mating block; 610-a frame; 640-a first consumable; 650-second consumable.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying 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, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to 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", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean 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 schematic view of a pushing device provided by the present invention with a housing removed;

fig. 2 is a schematic view of the pushing device provided by the present invention. The utility model provides a pushing device, which comprises a frame 610, a central roller 210, a squeezing component 200 and a driving component 300; the central roller 210 is mounted on the frame 610, the squeezing assembly 200 comprises a supporting plate 240, a first pressing wheel 220 and a second pressing wheel 230, the supporting plate 240 is connected to the power output end of the driving assembly 300, the first pressing wheel 220 and the second pressing wheel 230 are both mounted on the supporting plate 240, the first pressing wheel 220 and the second pressing wheel 230 are respectively located on two sides of the central roller 210 along the horizontal first direction, and conveying spaces for consumable materials to pass through are formed between the central roller 210 and the first pressing wheel 220 and between the central roller 210 and the second pressing wheel 230; the driving assembly 300 is configured to drive the supporting plate 240 to move in a horizontal first direction, so that the first pressing wheel 220 or the second pressing wheel 230 moves toward the central roller 210 to reach respective corresponding pressing positions, and one of the first pressing wheel 220 and the second pressing wheel 230 at the pressing position and the central roller 210 can rotate relatively to convey the consumable at the corresponding position.

The pushing device in this application is arranged in 3D printing apparatus on the printing shower nozzle. Among the prior art, when 3D printing apparatus has two printing shower nozzles, need two sets of wire feeders to carry the consumptive material to the printing shower nozzle that corresponds respectively usually, however every group wire feeder all has two wheels and a driving piece to make the part quantity of printing the shower nozzle more, occupation space is bigger. Because 3D printing apparatus's outside generally is equipped with protective housing, then when printing shower nozzle occupation space great, for avoiding bumping with protective housing, the displacement distance of printing the shower nozzle can receive the restriction, and then influences the printing precision. For convenience of description, XX ' in fig. 1 of the specification is defined as a left-right direction, YY ' is a front-back direction, ZZ ' is a vertical direction, wherein a horizontal first direction coincides with XX ' and a horizontal second direction coincides with YY '.

Specifically, in the present application, the supporting plate 240 is driven by the driving assembly 300 to move, so that the first pressing wheel 220 or the second pressing wheel 230 moves towards the central roller 210, the distance between the first pressing wheel 220 or the second pressing wheel 230 and the central roller 210 is reduced, that is, the conveying space is reduced, so that the consumable is extruded, and when one of the first pressing wheel 220 and the second pressing wheel 230 is close to the central roller 210, the other one is inevitably far away from the central roller 210, thereby realizing the switching of the extruded consumable, and then one of the first pressing wheel 220 and the second pressing wheel 230 in the extrusion position rotates relative to the central roller 210, thereby realizing that the consumable in the extrusion state is conveyed into the corresponding nozzle. This application has realized the switching of two kinds of consumptive materials through a drive assembly and three wheel promptly, compares in the structure that sets up two drive assemblies and four wheels among the prior art, has reduced the quantity of drive assembly and wheel in this application to reduced device part quantity, reduced the occupation space of printing the shower nozzle, and then improved the flexibility and the printing precision of printing the shower nozzle.

Further, the pressing position refers to a current position of the corresponding pressing wheel when the consumable can be pressed and the consumable in the pressed state can be conveyed to the corresponding printing nozzle by the relative rotation of the corresponding pressing wheel and the central roller 210. The supporting plate 240 is slidably connected to the frame 610 in the left-right direction, and when the driving assembly 300 drives the supporting plate 240 to move in the left-right direction, the supporting plate 240 can stably drive the first pressing wheel 220 or the second pressing wheel 230 to move towards the central roller 210 to reach the corresponding pressing positions, so that the consumables can be stably conveyed.

Further, the first pressing wheel 220 and the second pressing wheel 230 are respectively located at two end portions of the supporting plate 240, so that the length of the supporting plate 240 in the left-right direction, that is, the size of the printing head in the left-right direction can be reduced. For the sake of convenience, the consumable between the center roller 210 and the first pressing wheel 220 is defined as a first consumable 640, and the consumable between the center roller 210 and the second pressing wheel 230 is defined as a second consumable 650.

In addition, the surface of the central roller 210 is provided with a sawtooth structure; and/or, the surfaces of the first and second pressing wheels 220 and 230 are provided with saw-tooth structures. When the consumptive material was compressed tightly, the sawtooth structure can increase the friction with the consumptive material, and then be convenient for correspond the transport of position consumptive material. In some embodiments, gears can be directly used as the first pressing wheel 220, the second pressing wheel 230, and the central roller 210. When the central roller 210 rotates, one of the first pressing wheel 220 and the second pressing wheel 230 engaged with the central roller 210 is driven to rotate in a synchronous reverse direction, so as to extrude the material.

Referring to fig. 1, 3 and 4, fig. 3 is an exploded view of a pushing device according to the present invention; fig. 4 is an enlarged view at B in fig. 3. In one embodiment, the pushing device further comprises a transmission assembly 400, wherein the transmission assembly 400 comprises a transmission block 420 and a switching piece 410, the switching piece 410 is connected to the power output end of the driving assembly 300, and the transmission block 420 is arranged on the switching piece 410; the supporting plate 240 is provided with an inclined groove 242, the driving block 420 is inserted into the inclined groove 242, and when the driving assembly 300 drives the switching member 410 to move in the vertical direction, the driving block 420 pushes the groove wall of the inclined groove 242 so that the supporting plate 240 drives the first pressing wheel 220 or the second pressing wheel 230 to move towards the central roller 210.

Specifically, the inclined groove 242 is a long groove, and is inclined with respect to the vertical direction. Taking fig. 1 as an example, the first pressing wheel 220 is located on the right side of the central roller 210, the second pressing wheel 230 is located on the left end of the central roller 210, and the inclined groove 242 is inclined from right to left. When the driving assembly 300 drives the switching element 410 to move upwards, because the driving block 420 is inserted into the chute 242, the driving block 420 applies a force to the chute wall of the chute 242 to incline upwards from left to right, because the supporting plate 240 is connected with the rack 610 in a sliding manner along the left-right direction, the supporting plate 240 drives the first pressing wheel 220 and the second pressing wheel 230 to move rightwards, so that the second pressing wheel 230 is close to the central roller 210 to press the second consumable 650, the second consumable 650 between the first consumable 650 and the central roller 210 is pressed, and the first pressing wheel 220 is far away from the central roller 210, so that the first consumable 640 between the first consumable 640 and the central roller is released, namely, the printing nozzle corresponding to the second consumable 650 can print normally at the moment.

When the driving assembly 300 drives the switching element 410 to move downwards, since the driving block 420 is inserted into the chute 242, a downward force is applied to the wall of the chute 242 from right to left, and since the supporting plate 240 is slidably connected with the rack 610 in the left-right direction, the supporting plate 240 drives the first pressing wheel 220 and the second pressing wheel 230 to move left, so that the first pressing wheel 220 is close to the central roller 210 to extrude the first consumable 640, the first consumable 640 between the first pressing wheel 220 and the central roller 210 is extruded, and the second pressing wheel 230 is far away from the central roller 210, so that the second consumable 650 between the first pressing wheel 220 and the central roller 210 is loosened, that is, the printing nozzle corresponding to the first consumable 640 can print normally at this time.

Therefore, the switching of two kinds of consumptive materials has been realized through a drive assembly 300 and three wheel to this application, has reduced the quantity of device part, reduces device occupation space, and then improves the flexibility and the printing precision of printing the shower nozzle. It should be noted that, in other embodiments, the inclined slot 242 may be inclined downward from right to left, as long as it can realize that the supporting plate 240 moves in the left-right direction under the cooperation of the driving block 420.

In other embodiments, the support plate 240 can also move in the left-right direction through the cooperation of a gear and a rack, which are not described herein.

Furthermore, the switch 410 extends along the vertical direction and is located at the rear side of the supporting plate 240, and the driving assembly 300 is located at the upper end of the switch 410, so that the size of the device in the left-right direction can be reduced, the occupied space of the device is reduced, and the flexibility and the printing precision of the printing nozzle are improved.

Referring to fig. 1, 3 and 4, in one embodiment, an avoiding hole 243 is formed in a region between the first pressing wheel 220 and the second pressing wheel 230 on the supporting plate 240, the pushing device further includes a second driving member 250, an output shaft of the second driving member 250 passes through the avoiding hole 243 and is connected to the central roller 210, and the second driving member 250 is used for driving the central roller 210 to rotate around its own axis.

Specifically, the second driving member 250 is mounted on the frame 610, the supporting plate 240 is disposed at the front side of the second driving member 250, and the output shaft of the second driving member 250 extends out of the avoiding hole 243 and is connected to the central roller 210. The avoiding hole 243 extends in the left-right direction, so that when the support plate 240 moves in the left-right direction, the avoiding hole 243 can avoid the output shaft of the second driving member 250. The center roller 210 is rotated by the driving of the second driver 250, so that the first consumable 640 or the second consumable 650 is conveyed. Wherein the second driving member 250 is a motor.

It should be noted that, taking fig. 1 as an example of the specification, when the first consumable 640 is squeezed, the second driving element 250 drives the central roller 210 to rotate clockwise, so as to transport the first consumable 640 downward into the corresponding nozzle; when the second consumable 650 is pressed, the second driving member 250 drives the central roller 210 to rotate counterclockwise, thereby conveying the second consumable 650 downward into the corresponding showerhead.

In other embodiments, the first pinch roller 220 or the second pinch roller 230 can be driven to rotate relative to the central roller 210, so as to convey the first consumable 640 or the second consumable 650 downwards.

With continued reference to fig. 1, 3, and 4, in one embodiment, the frame 610 is provided with a first limiting groove extending along a horizontal first direction, the supporting plate 240 is slidably connected to a groove wall of the first limiting groove, and the first limiting groove is used for limiting the supporting plate 240 to move along a vertical direction.

Specifically, the first limiting groove extends in the left-right direction, so that the supporting plate 240 can be guided, the supporting plate 240 is driven by the driving block 420 to move stably in the left or right direction, and the first pressing wheel 220 and the second pressing wheel 230 on the supporting plate 240 stably move to the pressing position. Simultaneously, when central gyro wheel 210 rotated for the consumptive material relatively, can reverse exert for first pinch roller 220 or second pinch roller 230 along the power of vertical direction through the consumptive material, first spacing groove can play limiting displacement to backup pad 240 for one in first pinch roller 220 or second pinch roller 230 in the extrusion position can compress tightly the consumptive material that corresponds the position with central gyro wheel 210, thereby the transport of the consumptive material of being convenient for.

Referring to fig. 3 and 4, in one embodiment, the pushing device includes a first limiting plate 260 and a second limiting plate 270 connected to the frame 610, the first limiting plate 260 and the second limiting plate 270 are arranged at intervals in a vertical direction, a first limiting groove is formed between the first limiting plate 260 and the frame 610 and between the second limiting plate 270 and the frame 610, and a stopper 280 is arranged on the first limiting plate 260 and the second limiting plate 270, and the stopper 280 is used for limiting the support plate 240 to move in a horizontal second direction.

Specifically, the first limiting plate 260 is disposed at the upper end of the support plate 240, the second limiting plate 270 is disposed at the lower end of the support plate 240, and the stopper 280 is located at the front side of the support plate 240, thereby limiting the movement of the support plate 240 in the front and rear directions. The first and second limiting plates 260 and 270 are located at upper and lower sides of the supporting plate 240 to limit the movement of the supporting plate 240 in the up-and-down direction, so that the supporting plate 240 can be stably moved in the left-and-right direction by the driving of the driving block 420.

In other embodiments, the stopper 280 may be disposed on the first limiting plate 260 or the second limiting plate 270, and the specific connection relationship is the same as that described above, and therefore, the detailed description thereof is omitted.

Referring to fig. 1 and 2, in one embodiment, the driving assembly 300 includes a first driving member 310 and a cam 320, the cam 320 is connected to a power output end of the first driving member 310, a driving groove is formed on the cam 320, a matching block 460 is formed on the switching member 410, the matching block 460 abuts against an inner wall of the driving groove, and the first driving member 310 is used for driving the cam 320 to drive the switching member 410 to move in a vertical direction.

Specifically, the engaging block 460 is connected to the upper end of the switching member 410, and when the first driving member 310 drives the cam 320 to rotate around the front-rear direction, the driving groove of the cam 320 rotates synchronously with the cam 320, so that the position of the driving groove in the vertical direction changes, and the engaging block 460 is always abutted against the inner wall of the driving groove, so that the position of the engaging block 460 in the vertical direction can be changed. Preferably, the first driver 310 is a motor.

With continued reference to fig. 1, 3 and 5, in one embodiment, the driving assembly 300 includes a first driving member 310 and a cam 320, the cam 320 is connected to the power output end of the first driving member 310, and the upper end of the switching member 410 is provided with a matching block 460; the engaging block 460 abuts against the wheel wall of the cam 320 under the resilient force of the elastic member 430.

Specifically, the first driving member 310 is a motor, the matching block 460 is disposed above the protrusion 440, and the matching block 460 is always abutted against the wheel wall of the cam 320 under the resilient force of the elastic member 430, so that the cam 320 is driven to rotate by the first driving member 310, and the switching member 410 moves up and down. By providing the cam 320, the movement of the switch member 410 is more stable, and the structure of the device is more compact.

In other embodiments, the first driving member 310 may be a cylinder, and the switch 410 is pushed by the cylinder to move downward, and the switch 410 is reset by the resilience of the elastic member 430.

In one embodiment, the frame 610 is provided with a second limiting groove extending in the vertical direction, the switching element 410 is slidably connected to a groove wall of the second limiting groove, and the second limiting groove is used for limiting the switching element 410 to move in a direction other than the vertical direction.

Specifically, the second limiting groove extends in the up-down direction, so that the switching member 410 can be guided, the switching member 410 can be stably moved upwards or downwards under the driving of the cam 320, and the driving block 420 can stably apply the driving force to the groove wall of the chute 242 in the process that the driving block 420 is synchronously moved with the switching member 410.

Further, the first limiting member 260 and the second limiting member 270 are disposed at the front side of the second limiting groove and abut against the front side of the switching member 410, so as to limit the switching member 410 from moving in the front-back direction.

Referring to fig. 1, 3 and 5, fig. 5 is an enlarged view at C of fig. 3. In one embodiment, the transmission assembly 400 further comprises an elastic member 430 and a protrusion 440; the protruding block 440 is connected to the switching element 410, one end of the elastic element 430 elastically abuts against the frame 610, the other end elastically abuts against the protruding block 440, and the elastic element 430 is used for applying an upward force to the protruding block 440, so that the side wall of the matching block 460 always abuts against the groove wall of the driving groove.

Specifically, the driving groove is an open groove, the protrusion 440 is disposed above the transmission block 420, the upper end of the elastic member 430 elastically abuts against the lower end of the protrusion 440, the lower end of the elastic member 430 elastically abuts against the upper end of the first limiting plate 260, and when the driving assembly 300 drives the switching member 410 to move downward, the elastic member 430 is compressed, so that the movement of the switching member 410 is more stable; when the driving assembly 300 drives the switching member 410 to move upward, the elastic member 430 drives the protrusion 440 to move upward, so that the sidewall of the fitting block 460 is always abutted against the inner wall of the driving groove, and the switching member 410 moves in the up-and-down direction. Preferably, the elastic member 430 is a spring.

Further, the lower side of the protrusion 440 is provided with a guide groove 441 facing the opening, and the upper end of the elastic member 430 is received in the guide groove 441, so as to limit the movement of the switching member 410 in the vertical direction.

Still referring to fig. 1, 3 and 5, in one embodiment, the driving groove includes a first groove 321 and a second groove 322, the first groove 321 and the second groove 322 are distributed along the circumference of the cam 320, and the groove wall of the first groove 321 and the groove wall of the second groove 322 are in smooth transition; when the matching block 460 moves to abut against the groove wall of the first groove 321, the switching element 410 moves to the highest point, and when the matching block 460 moves to abut against the groove wall of the second groove 322, the switching element 410 moves to the lowest point.

Specifically, the groove wall of the first groove 321 and the groove wall of the second groove 322 are in smooth transition, so that the mating block 460 can stably move between the first groove 321 and the second groove 322, and thus the switching member 410 can stably move up and down. The arrangement of the first groove 321 and the second groove 322 can limit the movement of the matching block 460 to the highest point and the lowest point, so that the cam 320 can be prevented from continuously driving the matching block 460 to rotate due to inertia, and the stability of the movement of the matching block 460 is improved.

Furthermore, a hook is formed on the side wall of the cam 320 on the side of the second groove 322 far from the first groove 321, when the switching element 410 moves to the highest point, the hook can hook the matching block 460 and drive the matching block 460 to move upwards, so that the matching block 460 stably moves upwards to the highest point under the action of the hook and the spring, and the situation that the matching block 460 is not pushed upwards due to too small restoring force caused by too small spring deformation and the matching block 460 is separated from the side wall of the driving groove can be avoided.

Further, the engaging block 460 is a bearing, and when the cam 320 rotates relative to the engaging block 460, the bearing rotates relative to the cam 320, so as to reduce the friction force between the engaging block 460 and the wall of the cam 320, and thus the movement of the switch 410 is more stable.

In other embodiments, the driving slot is a closed slot, the engaging block 460 is accommodated in the driving slot, and the driving slot is matched with the engaging block 460 in shape, when the cam 320 drives the engaging block 460 to move, the slot wall of the driving slot pushes the engaging block 460 to move downwards, or pulls the engaging block 460 to move upwards.

Referring to fig. 1, 3 and 6, fig. 6 is an enlarged view at a in fig. 1. In one embodiment, the pushing device further includes a first nozzle module 110 and a second nozzle module 120, the first nozzle module 110 and the second nozzle module 120 are spaced apart along a horizontal first direction and are both connected to the rack 610, consumables between the first pressing wheel 220 and the central roller 210 extend into the throat 150 of the first nozzle module 110, and consumables between the second pressing wheel 230 and the central roller 210 extend into the throat 150 of the second nozzle module 120.

Specifically, when the first pressing wheel 220 is at the pressing position, the first consumable 640 is pressed and conveyed into the first nozzle module 110, so that the first nozzle module 110 can normally print, and when the second pressing wheel 230 is at the pressing position, the second consumable 650 is pressed and conveyed into the second nozzle module 120, so that the second nozzle module 120 can normally print, so that the device can normally work in the process of switching the pressing and conveying of the first consumable 640 and the second consumable 650.

In one embodiment, the first head module 110 is coupled to the switch 410 and the second head module 120 is coupled to the rack 610. By the driving of the driving assembly 300, the first and second consumable parts 640 and 650 can be switched to press while the first showerhead module 110 can be moved up and down with respect to the second showerhead module 120.

Specifically, the chute 242 is inclined from right to left, and when the cam 320 drives the switching member 410 to move downward, the first nozzle module 110 extends downward, the supporting plate 240 moves leftward, the first pressing wheel 220 is located at the pressing position, the first consumable 640 is pressed, and the first consumable 640 is conveyed to the first nozzle module 110 under the relative rotation of the central roller 210 and the first pressing wheel 220, so that the first nozzle module 110 operates normally; when the cam 320 drives the switching member 410 to move upwards, the first nozzle module 110 retracts upwards, the supporting plate 240 moves rightwards, the second pressing wheel 230 is located at the pressing position, the second consumable 650 is pressed, and the second consumable 650 is conveyed to the second nozzle module 120 under the relative rotation of the central roller 210 and the second pressing wheel 230, so that the second nozzle module 120 works normally. One of the second nozzle module 120 and the first nozzle module 110 in the working state is always located below the other, so that a scratch model of one of the second nozzle module and the first nozzle module which are not in the working state can be avoided, and the printing precision is improved. In addition, since the switching of the extrusion of the consumables and the replacement of the first and second head modules 110 and 120 are performed in synchronization and are performed by one driving member, time is saved and printing efficiency is improved.

Referring to fig. 1, fig. 2 and fig. 3, an embodiment of the present invention provides a 3D printing apparatus, including the pushing device. According to the application, the first spray head module 110 and the second spray head module 120 are staggered in the vertical direction, the spray head scratching model which is not in a working state is avoided, the printing precision is improved, meanwhile, the switching of the printing spray heads and the switching of consumable extrusion are driven by one driving piece, the time is saved, and the printing efficiency is improved.

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 represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. The pushing device is characterized by comprising a rack, a central roller, a squeezing assembly and a driving assembly; the central roller is mounted on the rack, the extrusion assembly comprises a support plate, a first pressing wheel and a second pressing wheel, the support plate is connected to the power output end of the driving assembly, the first pressing wheel and the second pressing wheel are mounted on the support plate, the first pressing wheel and the second pressing wheel are respectively positioned on two sides of the central roller along the horizontal first direction, and conveying spaces for consumable materials to pass through are formed between the central roller and the first pressing wheel and between the central roller and the second pressing wheel;

the driving assembly is used for driving the supporting plate to move along the horizontal first direction so as to enable the first pressing wheel or the second pressing wheel to move towards the central roller to reach respective corresponding extrusion positions, and one of the first pressing wheel and the second pressing wheel, which is located at the extrusion position, and the central roller can rotate relatively to convey the consumable at the corresponding position.

2. The pushing device of claim 1, further comprising a transmission assembly, wherein the transmission assembly comprises a transmission block and a switching member, the switching member is connected to a power output end of the driving assembly, and the transmission block is disposed on the switching member; the supporting plate is provided with a chute, the transmission block is inserted into the chute, and when the driving assembly drives the switching piece to move along the vertical direction, the transmission block pushes the chute wall of the chute so that the supporting plate drives the first pinch roller or the second pinch roller to move towards the central roller.

3. The pushing device as claimed in claim 2, wherein the frame is provided with a first limiting groove extending along a horizontal first direction, the support plate is slidably connected to a groove wall of the first limiting groove, and the first limiting groove is used for limiting the support plate to move along a vertical direction.

4. The pushing device of claim 3, wherein the pushing device comprises a first limiting plate and a second limiting plate connected to the frame, the first limiting plate and the second limiting plate are arranged at intervals in a vertical direction, the first limiting groove is formed between the first limiting plate and the frame, a stopper is arranged on the first limiting plate and/or the second limiting plate, and the stopper is used for limiting the support plate to move in a horizontal second direction, wherein the horizontal second direction is perpendicular to the horizontal first direction.

5. The pushing device of claim 2, wherein the driving assembly includes a first driving member and a cam, the cam is connected to a power output end of the first driving member, the cam is provided with a driving groove, the switching member is provided with a matching block, the matching block abuts against a groove wall of the driving groove, and the first driving member is configured to drive the cam to drive the matching block to move in a vertical direction.

6. The pushing device of claim 5, wherein the frame is provided with a second limiting groove extending in a vertical direction, the switching member is slidably connected to a groove wall of the second limiting groove, and the second limiting groove is configured to limit the switching member to move in a direction other than the vertical direction.

7. The crowd device of claim 5, where the drive assembly further includes a resilient member and a lug; the convex block is connected with the switching piece, one end of the elastic piece is elastically abutted against the rack, the other end of the elastic piece is elastically abutted against the convex block, and the elastic piece is used for applying upward force to the convex block so that the side wall of the matching block is always abutted against the groove wall of the driving groove.

8. The pushing device of claim 5, wherein the driving slot includes a first slot and a second slot, the first slot and the second slot are distributed along a circumferential direction of the cam, and a slot wall of the first slot and a slot wall of the second slot are smoothly transitioned;

when the matching block moves to abut against the groove wall of the first groove, the switching piece moves to the highest point, and when the matching block moves to abut against the groove wall of the second groove, the switching piece moves to the lowest point.

9. The pushing device according to any one of claims 1 to 8, wherein an avoiding hole is formed in a region between the first pressing wheel and the second pressing wheel in the supporting plate, the pushing device further comprises a second driving member, an output shaft of the second driving member penetrates through the avoiding hole and is connected to the central roller, and the second driving member is used for driving the central roller to rotate around the central roller in the axial direction.

10. A 3D printing apparatus comprising the jostling device of any one of claims 1-9.

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