CN220447185U - 3D printing device - Google Patents

Abstract

The utility model discloses a 3D printing device which comprises a chassis, a mounting frame and a piece positioning mechanism to be printed, wherein the chassis is arranged on the lower side of the mounting frame, and a printing platform is arranged on the chassis; the mounting frame is arranged on the upper side of the chassis through the height adjusting mechanism, and a plurality of groups of printing mechanisms are arranged on the mounting frame; the positioning mechanism of the piece to be printed is arranged on the printing platform and is matched with the piece to be printed for use; this device is through printing mechanism, high adjustment mechanism and treat setting of printing piece positioning mechanism, can realize the multiunit when using and print the simultaneous working of shower nozzle, effectively improved work efficiency, can realize simultaneously that the fixed of treating of printing the piece of different shapes, still be convenient for in time take off the printed piece of waiting to print, have convenient to use, simple structure and print efficient characteristics.

Description

3D printing device

Technical Field

The utility model belongs to the technical field of entity printing, and particularly relates to a 3D printing device.

Background

The 3D printing technology is a technology for constructing an object by using a powdery metal or plastic and other bondable materials based on a digital model file in a layer-by-layer printing mode; the 3d printer appears in the middle 90 th century, namely a rapid prototyping device utilizing the technologies of photo-curing, paper lamination and the like; the working principle of the printer is basically the same as that of a common printer, the printer is filled with printing materials such as liquid or powder, and after the printer is connected with a computer, the printing materials are overlapped layer by layer through computer control, and finally, a blueprint on the computer is changed into a real object; because of the unique advantages of this technology, it is now used in a variety of fields for the manufacture of garments, construction models, toys, automobile parts, etc.;

3D printing is widely used in many industries, for example, a 3D printing technology is used to form a wave-absorbing super surface on some irregular objects, so as to obtain a hidden solid structure, and in the printing process of the wave-absorbing super surface solid structure:

1. the printing platform of the existing powder 3D printer is separated from the printer, the printing platform needs to be detached after printing every time, and the printing platform needs to be installed again before printing, so that the workload of workers is increased, and meanwhile, the working efficiency is reduced;

2. the printing platform of the existing powder 3D printer is basically fixed on the printing platform by means of self gravity of the printing piece or clamping grooves, so that the printing effect is affected due to the fact that the position of the printing piece is easy to change in the printing process, the clamping grooves cannot be used for fixing the printing piece in multiple sizes and shapes, and the using function is single;

3. the existing 3D printing devices all adopt single printing heads, are not only inapplicable to the construction of printing pieces with huge volume, but also have low working efficiency;

therefore, there is a need to design a new 3D printing device to solve the above-mentioned problems of the prior art.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide the 3D printing device which can realize simultaneous operation of a plurality of groups of printing spray heads during use by the arrangement of the printing mechanism, the height adjusting mechanism and the workpiece positioning mechanism to be printed, effectively improve the working efficiency, simultaneously realize the fixation of the workpieces to be printed with different shapes, and facilitate the timely taking down of the printed workpieces to be printed.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

A3D printing device comprises a chassis, a mounting frame and a piece positioning mechanism to be printed,

the chassis is arranged on the lower side of the mounting frame, and a printing platform is arranged on the chassis;

the mounting frame is arranged on the upper side of the chassis through the height adjusting mechanism, and a plurality of groups of printing mechanisms are arranged on the mounting frame;

the to-be-printed piece positioning mechanism is arranged on the printing platform and is matched with the to-be-printed piece for use.

Preferably, the chassis is also provided with a screw rod, and the screw rod is arranged on the chassis through a bearing and is matched with the supporting leg of the mounting frame for use; the height adjusting mechanism comprises a first driving motor, a first driving gear, a driving crawler belt and a second driving gear,

the first driving motor is arranged on the chassis;

the first driving gear is arranged at the driving end of the first driving motor and meshed with the driving crawler belt;

the second driving gear is fixedly arranged on the threaded rod and meshed with the driving crawler belt.

Preferably, the chassis is also provided with a caulking groove and a rotating mechanism,

the caulking groove is matched with the printing platform for use;

the rotating mechanism comprises a second driving motor and a third driving gear, the second driving motor is arranged on the chassis, and the third driving gear is arranged at the driving end of the second driving motor and is meshed with a gear ring arranged on the outer side of the printing platform.

Preferably, the printing mechanism comprises a movable cross arm, a telescopic upright rod and a mounting plate,

the movable cross arm is arranged between two guide rail beams symmetrically arranged on the mounting frame through the transverse moving driving assembly and moves along the adjusting groove;

the telescopic upright rod is arranged on the mounting plate through the telescopic driving assembly, and a printing spray head is arranged on the telescopic upright rod;

the mounting plate is arranged on the movable cross arm, and a horizontal driving assembly is arranged on the mounting plate and is matched with the movable cross arm.

Preferably, the transverse moving driving assembly comprises a third transverse moving driving motor and a fourth driving gear, the third transverse moving driving motor is arranged on the movable cross arm, and the fourth driving gear is arranged at the driving end of the third transverse moving driving motor and is meshed with the clamping teeth arranged on the upper side wall of the adjusting groove.

Preferably, the movable cross arm is further provided with a clamping groove and a guide groove, and the clamping groove is arranged in the middle of the movable cross arm and penetrates through the movable cross arm to be matched with the horizontal driving assembly for use; the guide slots are symmetrically arranged on the movable cross arm and are matched with the clamping rails arranged on the mounting plate.

Preferably, the horizontal driving assembly comprises a fourth horizontal driving motor and a fifth driving gear, the fourth horizontal driving motor is arranged on the mounting plate, and the fifth driving gear is arranged at the driving end of the fourth horizontal driving motor and is meshed with the clamping teeth arranged on the inner side wall of the clamping groove.

Preferably, the telescopic driving assembly comprises a fifth telescopic driving motor and a sixth driving gear, the fifth telescopic driving motor is arranged on the mounting plate, and the sixth driving gear is arranged at the driving end of the fifth telescopic driving motor and is meshed with the latch arranged at one side of the telescopic vertical rod.

Preferably, the positioning mechanism of the workpiece to be printed comprises a sleeve column, a screw-connected column, a first hinge rod, a second hinge rod, a sleeve and a propping piece,

the sleeve column is fixedly arranged at the center of the printing platform;

the screw connection column is arranged on the sleeve column in a screw connection manner, and a limiting table is arranged on the screw connection column to be matched with the sleeve;

the hinge end of the second hinge rod is hinged with the sleeve column, and the propping piece is arranged at the end part of the free end of the second hinge rod and is matched with the inner wall of the piece to be printed;

one end of the first hinge rod is hinged with the sleeve member, and the other end of the first hinge rod is hinged with the second hinge rod.

The beneficial effects of the utility model are as follows: the utility model discloses a 3D printing device, which is improved compared with the prior art in that:

the utility model designs a 3D printing device which comprises a chassis, a mounting frame and a piece positioning mechanism to be printed, wherein when the 3D printing device is used:

1. through the arrangement of a plurality of groups of mutually independent printing mechanisms, when in use, each printing mechanism can realize independent printing, the construction efficiency is greatly improved, the construction period is shortened, meanwhile, the upper computer is used for controlling the action of the third transverse moving driving motor, the fourth horizontal driving motor and the fifth telescopic driving motor to move the printing spray heads in each direction of X, Y and Z axis 3, and the printing spray heads are used for printing the to-be-printed parts, so that the differential printing of different positions of the to-be-printed parts is realized, and the device has the advantages of wide application range and flexible adjustment;

2. through setting up the slewing mechanism on the chassis, when using, drive the print platform to rotate through the work of second driving motor, realize treating the printing of printing piece different positions, reduce the adjustment route of third sideslip driving motor, fourth horizontal driving motor and fifth flexible driving motor, has effectively improved work efficiency;

3. through the setting of the height adjusting mechanism, when in use, the first driving gear is driven to rotate through the action of the first driving motor, the first driving gear drives the screw rod through the meshing force between the first driving gear and the driving crawler, and then the whole height of the mounting frame is adjusted through the screw rod, so that the whole height of the mounting frame is adjusted according to the printing stage in the printing process, the printing mechanism can finish the work of printing a piece to be printed in real time, the automatic control and intelligent adjustment of the 3D printing process are effectively realized, and the device has the advantages of simple structure and convenience in use;

4. the positioning mechanism of the piece to be printed is arranged on the printing platform, when the printing platform is used, the relative positions of the screw connection column and the sleeve column are adjusted by rotating the adjusting handle at the tail part of the screw connection column, and then the supporting radius of the second hinge rod is adjusted, so that the lower parts of the pieces to be printed with different sizes are fixed, and the safety of the printing process is ensured;

5. the design print platform movable mounting is convenient when using and taking down in the caulking groove, is convenient for take down treat to print the piece and install print platform after printing is accomplished, has convenient to use, simple structure and printing efficiency's advantage.

Drawings

Fig. 1 is a schematic structural diagram of the 3D printing device in a use state of the present utility model.

Fig. 2 is a schematic structural diagram of the 3D printing device of the present utility model.

Fig. 3 is a schematic structural view of the chassis of the present utility model.

Fig. 4 is a schematic structural diagram of the printing platform of the present utility model.

Fig. 5 is a schematic structural view of the printing mechanism of the present utility model.

Fig. 6 is a partial enlarged view at the printing mechanism a of the present utility model.

Fig. 7 is a schematic structural view of the telescopic driving assembly of the present utility model.

Fig. 8 is a schematic structural view of the mounting plate of the present utility model.

Wherein: 1. the printing mechanism comprises a chassis, 11, a caulking groove, 12, a positioning post, 13, a printing platform, 131, a gear ring, 14, a second driving motor, 15, a third driving gear, 2, a mounting bracket, 21, a guide rail beam, 211, an adjusting gear, 22, a screw rod, 23, a bearing, 24, a supporting leg, 3, a printing mechanism, 31, a movable cross arm, 311, a clamping groove, 312, a third traversing driving motor, 313, a fourth driving gear, 314, a guide groove, 32, a telescopic upright post, 321, a printing nozzle, 33, a mounting plate, 331, a clamping rail, 34, a fifth telescopic driving motor, 35, a fourth horizontal driving motor, 36, a sixth driving gear, 37, a fifth driving gear, 4, a height adjusting mechanism, 41, a first driving motor, 42, a first driving gear, 43, a driving track, 44, a second driving gear, 5, a part to be printed, 6, a sleeve post, 62, a screw rod, 621, a limiting post, 63, a first hinge rod, 64, a second hinge rod, 65, a top piece and a tightening piece.

Detailed Description

In order to enable those skilled in the art to better understand the technical solution of the present utility model, the technical solution of the present utility model is further described below with reference to the accompanying drawings and examples.

Example 1: 1-8, a 3D printing device comprises a chassis 1, a mounting frame 2 and a part positioning mechanism 6 to be printed, wherein

The chassis 1 is arranged at the lower side of the mounting frame 2 and used for positioning the mounting frame 2, and a printing platform 13 is arranged on the chassis 1;

the mounting frame 2 is arranged on the upper side of the chassis 1 through a height adjusting mechanism 4, a plurality of groups of printing mechanisms 3 are arranged on the mounting frame 2, and the printing mechanisms 3 are used for printing a piece 5 to be printed in the use process;

the workpiece positioning mechanism 6 is arranged on the printing platform 13 and is matched with the workpiece 5 to be printed for use, and is used for fixing the workpiece 5 to be printed in the printing process.

Preferably, the chassis 1 is further provided with a screw rod 22, and the screw rod 22 is rotatably mounted on the chassis 1 through a bearing 23 and is in screw connection with a supporting leg 24 of the mounting frame 2.

Preferably, the chassis 1 on still be provided with caulking groove 11, caulking groove 11 and printing platform 13 cooperation use, when the installation, with printing platform 13 card go into caulking groove 11 in, accomplish printing platform 13's installation, and for fixing a position printing platform 13 when using caulking groove 11 center department be provided with the cooperation of reference column 12 and printing platform 13's bottom locating hole and use.

Preferably, in order to facilitate printing the piece 5 to be printed, the printing mechanism 3 is designed to be installed at the upper end of the mounting frame 2 through the guide rail beam 21 and is matched with the adjusting groove 211 arranged on the guide rail beam 21, and when in use, the printing mechanism 3 is adjusted to move along the adjusting groove 211 so as to print on the piece 5 to be printed.

Preferably, in use, to facilitate the printing of the piece 5 to be printed in all directions, the printing mechanism 3 is designed to comprise a movable cross arm 31, a telescopic upright 32 and a mounting plate 33, wherein

The movable cross arm 31 is arranged between the two symmetrically arranged guide rail beams 21 through a transverse moving driving assembly and horizontally moves along the adjusting groove 211 under the driving of the transverse moving driving assembly;

the telescopic upright rod 32 is mounted on the mounting plate 33 through a telescopic driving assembly, and is driven by the telescopic driving assembly to perform telescopic motion along the direction perpendicular to the mounting plate 33, and a printing nozzle 321 is mounted at the lower end of the telescopic upright rod 32 for printing;

the mounting plate 33 is movably mounted on the movable cross arm 31, and a horizontal driving assembly is further arranged on the mounting plate 33 and is matched with the movable cross arm 31.

Preferably, in order to facilitate the movement of the movable cross arm 31 along the length direction of the guide rail beam 21 during use, the traversing driving assembly is designed to include a third traversing driving motor 312 and a fourth driving gear 313, wherein the third traversing driving motor 312 is fixedly mounted on the movable cross arm 31, the fourth driving gear 313 is disposed on a driving shaft of the third traversing driving motor 312 and is engaged with a clamping tooth disposed on the upper side wall of the adjusting slot 211, and during use, the third traversing driving motor 312 acts to drive the fourth driving gear 313 to rotate, and the fourth driving gear 313 drives the movable cross arm 31 to move along the length direction of the guide rail beam 21 through an engaging force with the clamping tooth, so as to adjust the front and rear positions of the printing nozzle 321, thereby facilitating the printing of the components of the parts 5 to be printed in different positions.

Preferably, the moving cross arm 31 is further provided with a clamping groove 311 and a guiding groove 314, wherein the clamping groove 311 is longitudinally arranged in the middle of the moving cross arm 31 and penetrates through the moving cross arm 31 to be matched with the horizontal driving assembly; the guide grooves 314 are symmetrically arranged on the movable cross arm 31 and are matched with the clamping rails 331 arranged on the mounting plate 33, namely, when the movable cross arm is used, the mounting plate 33 is movably mounted on the movable cross arm 31 by clamping the clamping rails 331 in the guide grooves 314.

Preferably, in order to adjust the left and right positions of the printing nozzle 321 when in use, so as to print components at different left and right positions of the workpiece 5 to be printed, the horizontal driving assembly is designed to include a fourth horizontal driving motor 35 and a fifth driving gear 37, wherein the fourth horizontal driving motor 35 is fixedly mounted on the mounting plate 33, the fifth driving gear 37 is disposed on a driving shaft of the fourth horizontal driving motor 35 and is meshed with a latch disposed on an inner side wall (side inner side wall) of the clamping groove 311, that is, in use, the fourth horizontal driving motor 35 drives the fifth driving gear 37 to rotate when in operation, the fifth driving gear 37 drives the integral mounting plate 33 to horizontally move on the moving cross arm 31 through meshing force between the fourth horizontal driving gear and the latch on the inner side wall of the clamping groove 311, so as to adjust the left and right positions of the printing nozzle 321, so as to print components at different positions of the workpiece 5 to be printed.

Preferably, in order to facilitate the printing of the parts to be printed 5 with different heights, the telescopic driving assembly is designed to include a fifth telescopic driving motor 34 and a sixth driving gear 36, wherein the fifth telescopic driving motor 34 is fixedly mounted on the mounting plate 33, the sixth driving gear 36 is arranged on the driving shaft of the fifth telescopic driving motor 34 and is meshed with the latch teeth arranged on one side of the telescopic upright rod 32, and when in use, the fifth telescopic driving motor 34 acts to drive the sixth driving gear 36 to rotate, and the sixth driving gear 36 drives the telescopic upright rod 32 to make telescopic movement along the mounting plate 33 through the meshing force between the sixth driving gear 36 and the latch teeth on one side of the telescopic upright rod 32, so that the height of the printing nozzle 321 is adjusted, so that the parts to be printed 5 with different height positions can be conveniently printed.

Example 2: unlike the above embodiment 1, in order to facilitate the adjustment of the overall height of the mounting frame 2 according to the printing stage during use, the height adjustment mechanism 4 is designed to include a first driving motor 41, a first driving gear 42, a driving crawler 43, and a second driving gear 44, wherein the first driving motor 41 is embedded in the chassis 1; the first driving gear 42 is arranged at the driving end of the first driving motor 41 and meshed with the driving crawler belt 43; the second driving gear 44 is fixedly arranged on the screw rod 22 and meshed with the driving crawler belt 43;

that is, when in use, the first driving gear 42 is driven to rotate by the action of the first driving motor 41, the first driving gear 42 moves and drives the screw rod 22 by the meshing force between the first driving gear and the driving crawler 43, and then the whole height of the mounting frame 2 is adjusted by the screw rod 22, so that the whole height of the mounting frame 2 is adjusted according to the printing stage in the printing process, and the printing mechanism 3 can complete the work of printing the piece 5 to be printed in real time.

Example 3: unlike the above embodiment, in order to facilitate the rotation of the printing platform 13 during use and realize printing at different positions of the workpiece 5 to be printed, a rotation mechanism is further provided on the chassis 1, and the rotation mechanism includes a second driving motor 14 and a third driving gear 15, where the second driving motor 14 is fixedly mounted on the chassis 1; the third driving gear 15 is arranged at the driving end of the second driving motor 14 and meshed with the gear ring 131 arranged at the outer side of the printing platform 13;

namely, when in use, the second driving motor 14 works to drive the printing platform 13 to rotate, so that printing at different positions of the piece 5 to be printed is realized.

Example 4: unlike the above embodiment, in order to facilitate fixing the printing object 5 during printing, the printing platform 13 is further provided with an object positioning mechanism 6, and the object positioning mechanism 6 includes a sleeve 61, a screw post 62, a first hinge 63, a second hinge 64, a sleeve 65, and a pushing member 66, where

The sleeve column 61 is fixedly arranged at the center of the printing platform 13, and an internal thread is arranged in the sleeve column 61;

the screw connection column 62 is arranged on the sleeve column 61 in a screw connection manner, a limit table 621 is arranged on the screw connection column 62, and the limit table 621 is matched with the sleeve 65 for use;

the hinged end of the second hinge rod 64 is hinged with the sleeve column 61, and the propping piece 66 is movably arranged at the end part of the free end of the second hinge rod 64 and is matched with the inner wall of the piece 5 to be printed;

one end of the first hinge rod 63 is hinged with the sleeve member 65, and the other end is hinged with the second hinge rod 64; when in use, the relative positions of the screw post 62 and the sleeve post 61 are adjusted by rotating the adjusting handle at the tail part of the screw post 62, so that the supporting radius of the second hinge rod 64 is adjusted, and the lower parts of the to-be-printed pieces 5 with different sizes are fixed.

Preferably, the connecting rod of the screw-connection column 62 is provided with external threads, and the external threads are matched with internal threads in the sleeve column 61 to connect the sleeve column 61 with the screw-connection column 62 in a screw-connection manner.

Preferably, in order to facilitate the installation of the first hinge rod 63 and the second hinge rod 64, hinge seats are provided on the outer sides of the sleeve post 61 and the sleeve member 65, and the hinge seats are matched with the first hinge rod 63 and the second hinge rod 64.

Preferably, in order to facilitate the connection between the first hinge rod 63 and the second hinge rod 64, a hinge seat is further disposed on the second hinge rod 64, and the hinge seat is used in cooperation with the first hinge rod 63.

Preferably, for fixing the to-be-printed pieces 5 with different shapes, the second hinge rod 64 is designed to be a telescopic rod, and can be telescopic according to the to-be-printed pieces 5 with different shapes when in use, so that the second hinge rod is suitable for fixing the to-be-printed pieces 5 with different shapes.

The use process and the use flow of the 3D printing device described in the foregoing embodiments include:

1. firstly, when in use, according to the design size of a piece 5 to be printed, the printing mechanism 3 is controlled to print the piece 5 to be printed on the printing platform 13;

meanwhile, in the printing process, according to the structural shape of the workpiece 5 to be printed, the upper computer is used for controlling the third transverse moving driving motor 312, the fourth horizontal driving motor 35 and the fifth telescopic driving motor 34 to act so as to move the printing spray head 321 in each direction of X, Y and the Z axis 3, and the printing spray head 321 is used for printing the workpiece to be printed; according to the rotation of the printing platform 13 driven by the second driving motor 14 and the third driving gear 15, the printing at different positions of the piece 5 to be printed is realized, and the adjustment paths of the third traversing driving motor 312, the fourth horizontal driving motor 35 and the fifth telescopic driving motor 34 are reduced;

2. when the printing is performed to a certain height, the relative positions of the screw connection column 62 and the sleeve column 61 are adjusted by rotating the adjusting handle at the tail part of the screw connection column 62, so that the supporting radius of the second hinge rod 64 is adjusted, the lower parts of the to-be-printed pieces 5 with different sizes are fixed, and the to-be-printed pieces 5 are prevented from overturning when the upper structure is printed;

3. when the printing is performed to a certain height, the first driving gear 42 is driven to rotate by the action of the first driving motor 41, the first driving gear 42 moves and drives the screw rod 22 by the meshing force between the first driving gear and the driving crawler 43, and then the whole height of the mounting frame 2 is adjusted by the screw rod 22, so that the whole height of the mounting frame 2 is adjusted according to the printing stage in the printing process, and the printing mechanism 3 can finish the work of printing the piece 5 to be printed in real time;

4. and finally, after the printing is finished, the piece 5 to be printed is taken down, and the device is reset.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (9)

1. A 3D printing device, characterized in that: comprises a chassis, a mounting frame and a part to be printed positioning mechanism,

the chassis is arranged on the lower side of the mounting frame, and a printing platform is arranged on the chassis;

the mounting frame is arranged on the upper side of the chassis through the height adjusting mechanism, and a plurality of groups of printing mechanisms are arranged on the mounting frame;

the to-be-printed piece positioning mechanism is arranged on the printing platform and is matched with the to-be-printed piece for use.

2. A 3D printing device according to claim 1, characterized in that: the chassis is also provided with a screw rod, and the screw rod is arranged on the chassis through a bearing and is matched with the supporting leg of the mounting frame for use; the height adjusting mechanism comprises a first driving motor, a first driving gear, a driving crawler belt and a second driving gear,

the first driving motor is arranged on the chassis;

the first driving gear is arranged at the driving end of the first driving motor and meshed with the driving crawler belt;

the second driving gear is fixedly arranged on the threaded rod and meshed with the driving crawler belt.

3. A 3D printing device according to claim 1, characterized in that: the chassis is also provided with a caulking groove and a rotating mechanism,

the caulking groove is matched with the printing platform for use;

the rotating mechanism comprises a second driving motor and a third driving gear, the second driving motor is arranged on the chassis, and the third driving gear is arranged at the driving end of the second driving motor and is meshed with a gear ring arranged on the outer side of the printing platform.

4. A 3D printing device according to claim 1, characterized in that: the printing mechanism comprises a movable cross arm, a telescopic upright rod and a mounting plate,

the movable cross arm is arranged between two guide rail beams symmetrically arranged on the mounting frame through the transverse moving driving assembly and moves along the adjusting groove;

the telescopic upright rod is arranged on the mounting plate through the telescopic driving assembly, and a printing spray head is arranged on the telescopic upright rod;

the mounting plate is arranged on the movable cross arm, and a horizontal driving assembly is arranged on the mounting plate and is matched with the movable cross arm.

5. The 3D printing device according to claim 4, wherein: the transverse moving driving assembly comprises a third transverse moving driving motor and a fourth driving gear, the third transverse moving driving motor is arranged on the movable cross arm, and the fourth driving gear is arranged at the driving end of the third transverse moving driving motor and is meshed with the clamping teeth arranged on the upper side wall of the adjusting groove.

6. The 3D printing device according to claim 4, wherein: the movable cross arm is also provided with a clamping groove and a guide groove, and the clamping groove is arranged in the middle of the movable cross arm and penetrates through the movable cross arm to be matched with the horizontal driving assembly for use; the guide slots are symmetrically arranged on the movable cross arm and are matched with the clamping rails arranged on the mounting plate.

7. The 3D printing device according to claim 6, wherein: the horizontal driving assembly comprises a fourth horizontal driving motor and a fifth driving gear, the fourth horizontal driving motor is arranged on the mounting plate, and the fifth driving gear is arranged at the driving end of the fourth horizontal driving motor and is meshed with the clamping teeth arranged on the inner side wall of the clamping groove.

8. The 3D printing device according to claim 6, wherein: the telescopic driving assembly comprises a fifth telescopic driving motor and a sixth driving gear, the fifth telescopic driving motor is arranged on the mounting plate, and the sixth driving gear is arranged at the driving end of the fifth telescopic driving motor and is meshed with the clamping teeth arranged on one side of the telescopic vertical rod.

9. A 3D printing device according to claim 1, characterized in that: the positioning mechanism of the workpiece to be printed comprises a sleeve column, a screw connection column, a first hinge rod, a second hinge rod, a sleeve and a jacking piece,

the sleeve column is fixedly arranged at the center of the printing platform;

the screw connection column is arranged on the sleeve column in a screw connection manner, and a limiting table is arranged on the screw connection column to be matched with the sleeve;

the hinge end of the second hinge rod is hinged with the sleeve column, and the propping piece is arranged at the end part of the free end of the second hinge rod and is matched with the inner wall of the piece to be printed;

one end of the first hinge rod is hinged with the sleeve member, and the other end of the first hinge rod is hinged with the second hinge rod.