CN216658924U - Drive mechanism and 3D printer - Google Patents

Abstract

The utility model relates to a transmission mechanism and a 3D printer comprising the same. The transmission mechanism comprises a driving piece, a driving wheel and a crawler belt, and the crawler belt comprises a plurality of track joints which are connected in sequence. By arranging the clamping matching parts between the adjacent track sections, when the track sections do linear motion, the clamping blocks of the first track sections extend into the clamping grooves of the second track sections, and the first cambered surfaces are lapped on the second cambered surfaces, so that the clamping blocks can play a supporting role on the bearing areas above the clamping grooves, the bearing capacity of the track is improved, and the risk of the track sections collapsing caused by bearing models at the position is reduced; and, one side and the loading end parallel and level that the fixture block deviates from first cambered surface for the track can fully contact with the printing model, and the two has great contact friction, and the model is difficult for crawler movement relatively, therefore can reduce the risk of model at the printing in-process horizontal hunting, and then improve the printing quality of model.

Description

Drive mechanism and 3D printer

Technical Field

The utility model relates to the technical field of 3D printing, in particular to a transmission mechanism and a 3D printer.

Background

The 3D printing technique is a rapid prototyping technique, also known as additive manufacturing, which is a technique for constructing objects by using bondable materials such as powdered metal or plastic and the like in a layer-by-layer printing manner based on a digital model file. The effect that present 3D printer utilized hot bed and conveyer belt driven mode to realize infinite length printing as print platform through the conveyer belt, as long as remove the conveyer belt and just can print the position for beating printer head provides the difference, realize the continuous printing of panel. However, when the conveying belt is used for bearing the printing model, the weight of the model is increased along with the increase of the printing volume of the model, so that the conveying belt collapses, the model cannot be fixed, the model swings left and right in the printing process, and the printing quality is influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a transmission mechanism that solves the above-mentioned problem, in view of the problem that the conventional transmission mechanism is likely to collapse.

A transmission mechanism is arranged below a 3D printing head and comprises a driving part, a driving wheel and a crawler belt; the crawler belt is provided with a bearing surface, and the bearing surface is used for bearing the printing model; the crawler belt surrounds the driving wheel; the driving piece is connected with the driving wheel and is used for driving the driving wheel to rotate around the axis of the driving wheel; the driving wheel rotates to drive the crawler belt to do closed circular motion along the length direction of the crawler belt; the crawler belt comprises a plurality of track sections which are connected in sequence, and a clamping matching part is arranged between every two adjacent track sections; the clamping matching part comprises a clamping block and a clamping groove, and the clamping block and the clamping groove are respectively provided with a first cambered surface and a second cambered surface; when the shoe joint moves linearly, the clamping block extends into the clamping groove, and the first cambered surface is lapped on the second cambered surface, so that one side of the clamping block, which is far away from the first cambered surface, is flush with the bearing surface; when the track joint does circular motion, the first cambered surface slides along the second cambered surface so that the clamping block is partially separated from the clamping groove.

In one embodiment, the first arc surface is matched with the second arc surface in shape, so that when the track section performs circular motion, the first arc surface is attached to the second arc surface to slide.

In one embodiment, one of the driving wheel and the crawler is provided with a bump, and the other is provided with a positioning hole; when the driving wheel rotates, part of the lug can extend into the positioning hole to push the crawler to move.

In one embodiment, a side of the projection adjacent to the positioning hole is configured with a guide portion with gradually reduced size outwards along the radial direction, and the guide portion is used for guiding the projection to extend into the positioning hole.

In one embodiment, a radiant heating pipe is arranged in an annular space surrounded by the crawler belts and used for heating the crawler belts.

In one embodiment, the transmission mechanism further comprises an insulated shaft; and the heat insulation shaft penetrates through the first shaft sleeve and the second shaft sleeve of the adjacent track sections to connect the adjacent track sections.

In one embodiment, a reflective paper is disposed below the radiant-heating pipe.

In one of them embodiment, drive mechanism still includes transmission assembly, transmission assembly includes driving pulley, hold-in range and shaft coupling, driving pulley with the driving piece is connected, hold-in range cover is located driving pulley, driving pulley with the drive wheel passes through the shaft coupling is connected, with the power transmission of driving piece extremely the drive wheel.

In one embodiment, the transmission mechanism further comprises a frame and a mounting block mounted to the frame by a fastener, the mounting block being configured with a mounting hole for mounting the coupling.

A3D printer includes a 3D printing head and the transmission mechanism.

The technical scheme has the following beneficial effects: the driving wheel drives the driving wheel to rotate through the driving piece, and the driving wheel drives the caterpillar track to move in a reciprocating mode, so that continuous printing of the plates is achieved. By arranging the clamping matching parts between the adjacent track sections, when the track sections do linear motion, the clamping blocks of the first track sections extend into the clamping grooves of the second track sections, and the first cambered surfaces are lapped on the second cambered surfaces, so that the suspended areas in the clamping grooves are filled, the bearing areas above the clamping grooves can be supported, the printing model above the clamping grooves is supported, the bearing capacity of the track is improved, and the risk that the track sections collapse due to the bearing model at the position is reduced; and, one side and the loading end parallel and level that the fixture block deviates from first cambered surface for the track can fully contact with the printing model, and the two has great contact friction, and the model is difficult for crawler movement relatively, therefore can reduce the risk of model at the printing in-process horizontal hunting, and then improve the printing quality of model. When the track section moves to be matched with the driving wheel, the track section circularly moves around the driving wheel and slides along the second cambered surface through the first cambered surface, so that the part of the clamping block can be separated from the clamping groove, and the actual motion track requirement of the track is met.

Drawings

Fig. 1 is a schematic structural diagram of a 3D printer according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a transmission mechanism according to an embodiment of the present invention;

FIG. 3 is an exploded schematic view of the transmission shown in FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a schematic view of the track shown in FIG. 3, shown flipped 180 degrees;

fig. 6 is a partially enlarged view of fig. 5 at B.

Reference numerals: 10-3D printer; 100-a transmission mechanism; 110-a drive member; 120-driving wheel; 121-bumps; 1211-a guide part; 130-a driven wheel; 131-a driven shaft; 140-a crawler; 141-positioning holes; 142-a thermally insulated shaft; 143-a cartridge; 144-a card slot; 145-track section; 146-a first bushing; 147-a second bushing; 148-bearing surface; 150-radiant heating pipes; 161-drive pulley; 162-a synchronous belt; 163-drive shaft; 170-a frame; 171-a heating plate; 1711-mounting seat; 180-mounting a block; 200-3D print heads; 300-a frame; 310-a base; 320-a connecting rod; 330-a cartridge; 340-a display screen; 350-moving the assembly.

Detailed Description

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

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

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," "secured," and the like are to be construed broadly and can, 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 interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

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

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

Fig. 2 is a schematic structural diagram of a transmission mechanism 100 according to an embodiment of the present invention; FIG. 3 is an exploded view of the transmission 100 shown in FIG. 2; FIG. 4 is an enlarged view of a portion of FIG. 3 at A; FIG. 5 is a schematic view of the track 140 shown in FIG. 3, shown flipped 180 degrees; fig. 6 is a partially enlarged view of fig. 5 at B. As shown in fig. 2 to 6, the transmission mechanism 100 according to an embodiment of the present invention is disposed below the 3D print head 200, and includes a driving member 110, a driving wheel, and a track 140; the caterpillar 140 has a bearing surface 148, and the bearing surface 148 is used for bearing the printing model; the track 140 encircles the drive wheel; the driving part 110 is connected with the driving wheel and is used for driving the driving wheel to rotate around the axis of the driving wheel; the driving wheel rotates to drive the caterpillar 140 to do closed circular motion along the length direction of the caterpillar; the caterpillar 140 comprises a plurality of caterpillar sections 145 which are connected in sequence, and a clamping matching part is arranged between the adjacent caterpillar sections 145; the clamping matching part comprises a clamping block 143 and a clamping groove 144, and the clamping block 143 and the clamping groove 144 are respectively provided with a first arc surface and a second arc surface; when the shoe section 145 moves linearly, the fixture block 143 extends into the fixture groove 144, and the first arc surface is overlapped with the second arc surface, so that one side of the fixture block 143 departing from the first arc surface is flush with the bearing surface 148; when the shoe 145 makes a circular motion, the first arc surface slides along the second arc surface, so that the latch 143 is partially disengaged from the latch groove 144.

Specifically, the driving member 110 provides power for the entire transmission mechanism 100, the driving wheel includes a driving wheel 120 and a driven wheel 130, the caterpillar 140 surrounds the driving wheel 120 and the driven wheel 130, the driving wheel 120 is driven to rotate by the driving member 110, the driving wheel 120 is matched with the caterpillar 140 to drive the caterpillar 140 to perform closed circular motion along the length direction thereof, and the driven wheel 130 rotates synchronously with the driving wheel 120. As shown in fig. 5 and 6, the rightmost track 145 is named as a first track 145, and the second track 145, the third track 145, and so on are named in order from the right to the left. Each caterpillar link 145 is provided with a clamping block 143 on the right side, and a clamping groove 144 on the left side, and the clamping blocks are arranged corresponding to the clamping grooves 144. Because the adjacent track sections 145 are connected in sequence, when the track sections 145 do linear motion, the first arc surface is overlapped on the second arc surface, so that the clamping block 143 of the second track section 145 extends into the clamping groove 144 of the first track section 145, a suspended area in the clamping groove 144 is filled, a bearing area above the clamping groove 144 is supported, a printing model above the clamping groove 144 is supported, the bearing capacity of the first track section 145 is improved, the integral bearing capacity of the track 140 is improved, and the bearing surface 148 is not easy to collapse when bearing the model.

Further, because one side that fixture block 143 deviates from first cambered surface is with bearing surface 148 parallel and level, consequently can make whole bearing surface 148 keep the parallel and level for bearing surface 148 of track 140 fully contacts with the printing model, and the two has great contact friction, and the difficult relative track 140 removal of model, therefore can reduce the risk of model in the printing in-process horizontal hunting, guarantees the shaping quality and the shaping precision of model, thereby improves the printing quality of model. When the shoe 145 moves to be matched with the driving wheel 120 or the driven wheel 130, the shoe 145 makes a circular motion around the driving wheel 120, and slides along the second arc surface through the first arc surface, so that the part of the clamping block 143 can be separated from the clamping groove 144, and the actual motion track requirement of the crawler 140 is met. A plurality of the clamping blocks 143 and the clamping grooves 144 are uniformly distributed along the length direction of the caterpillar section 145 at intervals, so that no matter the printing model is placed at the position close to the end part or the middle part of the caterpillar section 145, the clamping blocks 143 and the clamping grooves 144 are matched to play a supporting role, the bearing capacity of the caterpillar 140 is ensured, and the risk of collapse is reduced. In this embodiment, the caterpillar 140 is made of a rigid material, and is not easily deformed when being subjected to an external force, and when the high-temperature 3D printing head 200 is reset, the caterpillar 140 is in contact with the caterpillar 140, and the caterpillar 140 is hard, so that the high-temperature printing head is not easily scratched, the service life of the caterpillar 140 is ensured, and the replacement cost is reduced.

As shown in fig. 5 and 6, in an embodiment, the first arc surface is adapted to the second arc surface in shape, that is, the radius of curvature of the first arc surface is similar to or equal to the radius of curvature of the second arc surface, for example, the first arc surface and the second arc surface are both concave arcs formed by bending downwards along the thickness direction (i.e., the vertical direction in fig. 6) of the shoe section 145, so that when the shoe section 145 makes a linear motion, the first arc surface and the second arc surface are completely attached to each other, the fixture block 143 can be completely engaged with the fixture groove 144, the contact area between the first arc surface and the second arc surface is increased, the supporting capability of the fixture block 143 on the bearing surface above the fixture groove 144 is increased, and the risk of collapsing is reduced; when the shoe 145 performs circular motion, the first arc surface can be attached to the second arc surface to slide, the second arc surface plays a guiding role in sliding the fixture block 143, so that the fixture block 143 is partially separated from the clamping groove 144, and the switching requirement of the shoe 145 between circular motion and linear motion is met under the condition that the width of the shoe 145 is unchanged. In other embodiments, the curvature radii of the first arc surface and the second arc surface may be different, so that when the track link moves linearly, the end of the first arc surface abuts against the second arc surface, and other areas are suspended relative to the second arc surface, and the end supports the bearing area; when the track section does circular motion, the end part of the first cambered surface slides along the second cambered surface, so that the clamping block slides out of the clamping groove.

As shown in fig. 3 and 4, in another embodiment, the driving wheel 120 is provided with a plurality of protrusions 121 radially outward, one side of the track 145 facing the driving wheel 120 is provided with positioning holes 141, and the size of the positioning protrusions 121 is smaller than that of the positioning holes 141. When the driving wheel 120 rotates until the bump 121 is aligned with the positioning hole 141, a part of the bump 121 can extend into the positioning hole 141 and contact with the hole wall of the positioning hole 141, and the bump 121 moves the track 145 along with the continuous rotation of the driving wheel 120; after the caterpillar sections 145 are conveyed to the right position, the lugs 121 are gradually separated from the positioning holes 141, and other lugs 121 extend into the positioning holes 141 in the new caterpillar sections 145, so that the caterpillar 140 integrally reciprocates. Because each locating hole 141 is distributed along the length direction of the crawler 140, the matching of the lug 121 and the locating hole 141 enables the lug 121 to shift the crawler 140 to move, the lug 121 is constantly matched with a new locating hole 141, and the moving direction of the crawler 140 is consistent with the distribution direction of the locating hole 141, so that the moving of the crawler 140 is guided, the risk of the slant of the crawler 140 is reduced, the risk of the slant of a loaded printing model is reduced, and the printing quality is ensured. In other embodiments, the driving wheel may be provided with positioning holes along the circumferential direction, and the track section is provided with a protruding block protruding towards one side of the driving wheel, so that the track is conveyed by the cooperation of the two.

As shown in fig. 4, in one embodiment, a side of the protrusion 121 adjacent to the positioning hole 141 is configured with a guide portion 1211 with a gradually decreasing size outward in a radial direction. When the protrusion 121 is rotated to align with the positioning hole 141, the protrusion 121 is guided to extend into the positioning hole 141 and contact with the positioning hole 141 due to the gradually decreasing size of the guide portion 1211 from the protrusion 121 toward the positioning hole 141, and the contact area between the protrusion 121 and the positioning hole 141 can be reduced, so that the friction between the protrusion 121 and the positioning hole 141 is reduced, and the protrusion 121 can be easily detached from the positioning hole 141.

As shown in fig. 2, in one embodiment, the transmission mechanism 100 further comprises a transmission assembly including a transmission pulley 161, a timing belt 162, and a coupling. An output shaft of the driver 110 is connected to the lower driving pulley 161, so that the power of the driver 110 is transmitted to the lower driving pulley 161; the timing belt 162 is sleeved on the lower driving pulley 161 and the upper driving pulley 161 to transmit power to the upper driving pulley 161; the upper driving pulley 161 is coupled to the driving wheel 120 by a coupling, so that power is transmitted to the driving wheel 120, and the track 140 moves by the rotation of the driving wheel 120. The transmission components are distributed at intervals along the height direction, the power of the driving component 110 is transmitted to the driving wheel 120 through the transmission components, and the axial occupied space of the driving wheel 120 is reduced when the driving component 110 is directly connected with the driving wheel 120, so that the assembly of the transmission mechanism 100 is more compact, and the occupied area is reduced.

In yet another embodiment, as shown in fig. 2 and 3, the transmission mechanism 100 further includes a frame 170, and the frame 170 is provided at four corners thereof with mounting blocks 180, and the mounting blocks 180 are mounted on the frame 170 by fasteners such as bolts. As shown in fig. 3, the mounting block 180 for connecting the left side of the driving shaft 163 is configured with a coupling mounting hole, the coupling is used for connecting the driving shaft 163 with the driving pulley 161, the driving wheels 120 on the left and right sides are sleeved on the driving shaft 163, the synchronous rotation of the driving wheels 120 on the left and right sides is ensured, the synchronous movement of the tracks 140 on the left and right sides is ensured, and the risk that the tracks 140 are skewed due to asynchronous movement on the left and right sides is reduced. Similarly, the driven shafts 131 for connecting the two driven wheels 130 are mounted on the other two mounting blocks 180 through bearings. The driving wheel 120 and the driven wheel 130 are mounted on the frame 170, so that the risk of displacement caused by rotation of the driving wheel 120 and the driven wheel 130 is reduced, and the two ends of the crawler 140 are matched with the driving wheel 120 and the driven wheel 130, so that the movement of the crawler 140 is controllable, and a stable bearing platform is obtained.

As shown in fig. 3, in an alternative embodiment, a heating plate 171 is connected to the frame 170, a radiant heating pipe 150 is installed on the heating plate 171, and the radiant heating pipe 150 is disposed in an annular space defined by the caterpillar 140, and the caterpillar 140 is heated by radiation of light emitted from the radiant heating pipe 150. Continuously heat caterpillar sections 145 in the printing range through the heating pipe, ensure the adhesion of the printing model and the caterpillar 140, and reduce the shrinkage and warpage of the model in the cooling process. Because the crawler 140 is heated by non-contact radiation, the crawler 140 does not need to be heated by the contact of the hot bed and the crawler 140, so that the friction force between the crawler 140 and the hot bed is reduced, the moving resistance of the crawler 140 is reduced, the load of the driving element 110 is reduced, and the phenomenon of heating caused by the overlarge load of the driving element 110 is further reduced. Specifically, the infrared heating pipe is used as a heat source to radiantly heat the crawler belt 140, so that the crawler belt 140 is rapidly heated. As shown in fig. 3, a mounting seat 1711 is provided on a side of the heating plate 171 facing the heating pipe 150, and the mounting seat 1711 is connected to the heating plate 171 by a fastening member such as a screw. The mounting seat 1711 is formed with a mounting groove for snap-fastening the heating pipe 150 such that a radiation area of the heating pipe 150 is constant.

In one embodiment, a reflective paper is disposed below the radiant-heating pipe 150. So that the light rays radiated to the lower part of the heating pipe are reflected to the caterpillar track 140 above the heating pipe by the reflective paper, and the energy is concentrated to the caterpillar track section 145 above the heating pipe. By concentrating the heat, the caterpillar 140 above the heating tube is rapidly heated. Because the light rays irradiated below the heating pipe are reflected away, the non-bearing area below the heating pipe does not need to be heated, and therefore energy waste generated by radiation to the non-bearing area is reduced.

As shown in fig. 5 and 6, in one embodiment, the transmission 100 further includes an insulated shaft 142; the two sides of each caterpillar section along the width direction are respectively provided with a first shaft sleeve 146 and a second shaft sleeve 147, and the first shaft sleeves 146 and the second shaft sleeves 147 are arranged at intervals along the length direction of the caterpillar section 145. The width direction of each track section is the left-right direction in fig. 5, and the heat insulation shaft 142 penetrates through the first shaft sleeve and the second shaft sleeve of the adjacent track section to connect the adjacent track sections, so that when one track section 145 moves, the adjacent track sections 145 can be driven to move, and the synchronism of the overall movement of the track 140 is ensured. The heat insulating shaft 142 is made of a heat insulating material such as an aluminum foil heat insulating coil. Because the heat insulation shaft 142 sequentially penetrates through the shaft sleeves of the adjacent track sections 145, the heat insulation shaft 142 can also play a role in isolating heat transfer between the adjacent track sections 145, prevent the heat of the track sections in the bearing area from being transferred to the non-bearing area, reduce the heat loss, insulate the heat of the track sections 145 in the bearing area, and concentrate the heat in the track sections 145 in the printing range.

As shown in fig. 5, in a specific embodiment, the first bushing 146 and the second bushing 147 are spaced apart from each other along the length direction of the track 145, and the positions of the first bushing and the second bushing are staggered from each other, so as to ensure the connection reliability and the distribution uniformity of the connection positions of the adjacent track 145. The first shaft sleeve 146 and the second shaft sleeve 147 are provided with openings at one side in the radial direction, and the heat insulation shaft 142 can penetrate through the shaft sleeves along the openings and is sleeved on the inner walls of the shaft sleeves, so that the crawler 140 can be quickly installed.

Fig. 1 is a schematic structural diagram of a 3D printer 10 according to an embodiment of the present invention. As shown in fig. 1, the present invention further provides a 3D printer 10, which includes a 3D print head 200 and the above-mentioned transmission mechanism 100. The 3D print head 200 is disposed above the transmission mechanism 100, and when the model of a certain carrying area of the caterpillar 140 is printed, the driving element 110 drives the driving wheel 120 to rotate, so as to drive the caterpillar 140 to move, and thus other carrying areas are moved to the lower side of the 3D print head 200, and the model is continuously printed. Due to the fact that the 3D printer 10 is provided with the transmission mechanism 100, the bearing capacity of the crawler 140 can be guaranteed, the risk that the bearing surface 148 collapses downwards is reduced, the risk that the model swings left and right in the printing process is further reduced, and the printing quality of the model is improved.

As shown in fig. 1, in an embodiment, the 3D printer 10 further includes a triangular prism-shaped frame 300 and a moving assembly 350 mounted on the frame 300, and the 3D print head 200 is connected to the moving assembly 350, such that the moving assembly 350 can drive the 3D print head 200 to move along the frame 300, thereby implementing the stack molding of the model. The whole frame 300 is triangular, so that the connection is more stable and reliable, the risk that the frame 300 shakes due to self weight when the 3D printing head 200 moves along the frame 300 is reduced, and the accuracy of the extrusion position of the printing head is further ensured. The moving assembly 350 may be a linear motor, etc.

As shown in fig. 1, specifically, the frame 300 includes a base 310 and a plurality of connecting rods 320 mounted to the base 310. The driving mechanism 100 is mounted on the base 310 by a fastener such as a bolt so that the driving mechanism 100 is located below the 3D printing head 200. Also mounted on the chassis 300 are a cartridge 330 and a display screen 340, the cartridge 330 being used to supply printing raw materials to the 3D printhead 200. A material is wound around the cartridge 330, and unwinding the cartridge 330 can transport the material to the 3D printhead 200. The display screen 340 is used for displaying parameters such as the extrusion speed of the 3D print head 200, which is convenient for an operator to monitor the current printing state.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

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

Claims (10)

1. A transmission mechanism is arranged below a 3D printing head and is characterized by comprising a driving part, a driving wheel and a crawler;

the crawler belt is provided with a bearing surface, and the bearing surface is used for bearing the printing model; the crawler belt surrounds the driving wheel; the driving piece is connected with the driving wheel and is used for driving the driving wheel to rotate around the axis of the driving wheel; the driving wheel rotates to drive the crawler belt to do closed circular motion along the length direction of the crawler belt;

the crawler belt comprises a plurality of track sections which are connected in sequence, and a clamping matching part is arranged between every two adjacent track sections; the clamping matching part comprises a clamping block and a clamping groove, and the clamping block and the clamping groove are respectively provided with a first cambered surface and a second cambered surface;

when the shoe joint moves linearly, the clamping block extends into the clamping groove, and the first cambered surface is lapped on the second cambered surface, so that one side of the clamping block, which is far away from the first cambered surface, is flush with the bearing surface;

when the track joint does circular motion, the first cambered surface slides along the second cambered surface so that the clamping block is partially separated from the clamping groove.

2. The transmission mechanism as claimed in claim 1, wherein the first cambered surface is adapted to the second cambered surface in shape, so that the first cambered surface slides along the second cambered surface when the track section performs circular motion.

3. The transmission mechanism as claimed in claim 1, wherein one of the drive wheel and the track is provided with a projection and the other is provided with a locating hole; when the driving wheel rotates, the part of the lug can extend into the positioning hole to push the track section to move.

4. The transmission mechanism as claimed in claim 3, wherein a side of the projection adjacent to the positioning hole is formed with a guide portion having a gradually decreasing size radially outward for guiding the projection to protrude into the positioning hole.

5. The transmission according to claim 1, wherein the endless track encloses an annular space in which radiant heating tubes are arranged for heating the endless track.

6. The transmission mechanism as claimed in claim 5, further comprising an insulated shaft; and the heat insulation shaft penetrates through the first shaft sleeve and the second shaft sleeve of the adjacent track sections to connect the adjacent track sections.

7. Transmission mechanism according to claim 5, characterized in that a reflective paper is arranged below the radiant-heating pipe.

8. The transmission mechanism according to claim 1, further comprising a transmission assembly, wherein the transmission assembly comprises a transmission pulley, a synchronous belt and a coupling, the transmission pulley is connected to the driving member, the synchronous belt is sleeved on the transmission pulley, and the transmission pulley is connected to the driving wheel through the coupling so as to transmit the power of the driving member to the driving wheel.

9. The transmission mechanism as claimed in claim 8, further comprising a frame and a mounting block mounted to the frame by fasteners, the mounting block configured with mounting holes for mounting the coupling.

10. A 3D printer comprising a 3D print head and the actuator of any one of claims 1 to 9.

Images