CN212021691U

CN212021691U - Scraping plate mechanism for 3D printer

Info

Publication number: CN212021691U
Application number: CN201922167631.3U
Authority: CN
Inventors: 程永
Original assignee: Hengtong Xijiao Intelligent Machine Guangdong Co Ltd
Current assignee: Hengtong Xijiao Intelligent Machine Guangdong Co Ltd
Priority date: 2019-12-05
Filing date: 2019-12-05
Publication date: 2020-11-27
Anticipated expiration: 2029-12-05

Abstract

The utility model belongs to the technical field of the technique of 3D printer and specifically relates to a 3D is scraping plate mechanism for printer is related to. The scraping plate mechanism comprises a support, a scraping plate, a belt and a driving assembly, wherein the scraping plate, the belt and the driving assembly are all arranged on the support; the number of the belts is two, the belts are respectively a first belt and a second belt, the first belt is arranged at one end of the bracket, and the second belt is arranged at the other end of the bracket; the driving assembly is used for driving the two belts to move simultaneously; one end of the scraper blade is detachably connected with the first belt, and the other end of the scraper blade is detachably connected with the second belt. The utility model discloses following beneficial effect has: 1. two belt motions of drive assembly simultaneous drive to the both ends motion of drive scraper blade, in order strickle off the liquid level, because the both ends of scraper blade are the drive section, so the scraper blade can not appear blocking, strickle off effectually. 2. The four gears and the connecting piece are arranged, so that one motor can drive the two belts to move simultaneously, and energy is saved.

Description

Scraping plate mechanism for 3D printer

Technical Field

The utility model relates to a technical field of 3D printer, more specifically say, it relates to a scraping plate mechanism for 3D printer.

Background

3D printing is one of the rapid prototyping technologies, which is a technology for building objects by layer-by-layer printing based on a digital model file. Currently, a 3D printer performs 3D printing based on the principle of photopolymerization of liquid photosensitive resin. This 3D printer includes resin tank, laser emitter and scraper mechanism, is full of liquid light-cured resin in the resin tank, and resin tank top is provided with mobilizable laser emitter, and laser emitter transmission laser, laser are scanned on the resin liquid level, and the place that the laser beam was hit, and resin liquid just solidifies, and after one deck scanning was accomplished, the place that is not shone is still liquid resin. Then the molding resin descends by one layer, and the molding layer is fully covered by one layer of resin, but the liquid level of the resin liquid is not level enough, and the liquid level of the resin needs to be scraped by a scraper mechanism, and then the next layer is scanned.

A scraper mechanism at present includes scraper blade, motor, direction slide rail and lead screw, and the one end and the lead screw thread of scraper blade cup joint, and the other end and the direction slide rail of scraper blade cup joint, and the motor is used for driving the lead screw to rotate, and when motor drive, the lead screw drives the axial motion of scraper blade along the lead screw to strickle off the liquid level.

But above-mentioned scraper mechanism is scraping the resin liquid level at ordinary times, because resin viscosity is very big, very easily takes place the adhesion with the scraper blade surface, has great resistance when leading to the scraper blade to move, because the scraper blade cup joints with the direction slide rail, so the scraper blade easily receives the card pause with the one end that the direction slide rail cup jointed, leads to scraping flat efficiency lower and scrape flat effect not good.

Disclosure of Invention

The utility model aims at providing a 3D is scraping plate mechanism for printer mainly lies in solving among the prior art scraper blade and is easily receiving the problem that the card stops scraping the in-process of liquid level.

The above object of the present invention is achieved by the following technical solutions: a scraping plate mechanism for a 3D printer comprises a support, a scraping plate, a belt and a driving assembly, wherein the scraping plate, the belt and the driving assembly are all arranged on the support;

the number of the belts is two, the belts are respectively a first belt and a second belt, the first belt is arranged at one end of the bracket, and the second belt is arranged at the other end of the bracket;

the driving assembly is used for driving the two belts to move simultaneously;

one end of the scraper blade is detachably connected with the first belt, and the other end of the scraper blade is detachably connected with the second belt.

Through adopting above-mentioned technical scheme, drive assembly drive belt motion, the belt drives the scraper blade motion, because the both ends of scraper blade all are connected with the belt, so the both ends of scraper blade are the drive end, and the scraper blade moves under the drive of two belts to strickle off the liquid level, at this in-process, the scraper blade can not appear blocking and dunng, so strickle off effectually.

The utility model discloses further set up to: the first belt and the second belt are synchronous belts and are arranged at two ends of the bracket in parallel;

the driving assembly comprises a motor, a connecting piece, a first driving gear, a second driving gear, a first driven gear and a second driven gear;

the motor is used for driving the first driving gear to rotate;

the first driving gear is connected with the second driving gear through a connecting piece;

the first driving gear and the first driven gear are both meshed with the first belt, the first driving gear is arranged at one end of the first belt, and the first driven gear is arranged at the other end of the first belt;

the second driving gear and the second driven gear are both meshed with the first belt, the second driving gear is arranged at one end of the first belt, and the second driven gear is arranged at the other end of the first belt.

Through adopting above-mentioned technical scheme, the first driving gear of motor drive rotates, and first driving gear drives the connecting piece motion, and the connecting piece drives the motion of second driving gear. Meanwhile, the first driving gear drives the first belt to move, the second driving gear drives the second belt to move, and the first belt and the second belt synchronously move and drive the scraper to move so that the scraper can scrape the liquid level.

The utility model discloses further set up to: the device also comprises a sliding cross beam and a belt pressing block, wherein grooves are formed in two ends of the sliding cross beam;

the bottom of each groove is provided with a plurality of teeth, the bottom of each groove is used for being meshed with the synchronous belt, one groove is used for accommodating the first belt, and the other groove is used for accommodating the second belt;

the belt pressing blocks are detachably connected with the opening of the groove, one belt pressing block is used for abutting against the first belt, and the other belt pressing block is used for abutting against the second belt;

the scraper is arranged on the sliding cross beam, connected with the first belt through the sliding cross beam and connected with the second belt through the sliding cross beam;

through adopting above-mentioned technical scheme, the sliding beam is through recess and the belt meshing that has the tooth, then will press the area piece to contradict with the belt, forms the draw-in groove between the tooth of recess bottom this moment, blocks the belt, prevents the relative sliding beam motion of belt. At the moment, when the first belt and the second belt move, the sliding cross beam is driven to move so as to drive the scraper to move.

The utility model discloses further set up to: the belt conveyor is characterized by further comprising two guide slide rails, wherein the two guide slide rails are arranged on the support and respectively comprise a first guide rail and a second guide rail, the first guide slide rail is arranged at one end, far away from the second belt, of the first belt, and the second guide slide rail is arranged at one end, far away from the first belt, of the second belt;

the two guide sliding rails are arranged in parallel, and the length directions of the two guide sliding rails are consistent with the conveying direction of the belt;

the sliding beam is also provided with two guide parts which are respectively a first guide part and a second guide part, and the first guide part and the second guide part are respectively arranged at two ends of the sliding beam;

the first guide part is connected with the first guide slide rail in an inserting mode, the second guide part is connected with the second guide slide rail in an inserting mode, and the guide parts can move along the length direction of the guide slide rails.

Through adopting above-mentioned technical scheme, because resin is comparatively thick, so the resistance that the scraper blade received is great at the in-process of scraper blade motion, easily takes place the shake at the in-process of scraper blade motion. In order to solve the problem, the scraper can be provided with a guide part, the guide part is inserted into the guide sliding rail, and in the moving process of the scraper, the scraper moves along the length direction of the guide sliding rail so as to prevent the scraper from shaking.

The utility model discloses further set up to: the guide sliding rails are provided with strip-shaped sliding chutes, and the length direction of each strip-shaped sliding chute is consistent with the length direction of the guide sliding rail where the strip-shaped sliding chute is located;

the guide part is provided with a protrusion, the protrusion is used for being connected with the corresponding strip-shaped sliding groove in an inserting mode, and the protrusion can move relative to the strip-shaped sliding groove.

Through adopting above-mentioned technical scheme, the arch can prevent that the guide part from along the in-process of corresponding direction slide rail motion, guide part and direction slide rail separation, lead to the moving direction of scraper blade to take place the skew.

The utility model discloses further set up to: the support is provided with the stopper, and the stopper is used for contradicting with the second guide part.

Through adopting above-mentioned technical scheme, the stopper can contradict with the guide part to prevent that the hold-in range from excessively rotating and leading to support and scraper blade conflict, the scraper blade damages, also can effectually prevent that hold-in range motion from excessively leading to sliding beam and motor collision in addition.

The utility model discloses further set up to: the motor reversing mechanism is characterized by further comprising two reversing switches, wherein the reversing switches are arranged on the support, one reversing switch is used for controlling the motor to rotate forwards, and the other reversing switch is used for controlling the motor to rotate backwards.

By adopting the technical scheme, the reversing switch can change the positive and negative rotation of the motor, so that the conveying directions of the two belts are changed, and the direction of the scraper is changed.

The utility model discloses further set up to: the reversing switches are provided with trigger blocks and pressing blocks, and gaps are reserved between the pressing blocks and the corresponding trigger blocks;

the pressing block has elasticity and is used for opening the reversing switch when the pressing block is abutted against the corresponding trigger block;

the sliding beam is provided with a contact part, the contact part is used for contacting with a pressing block of one reversing switch when moving to a first position, so that the pressing block contacts with a corresponding trigger block, and the contact part is used for contacting with a pressing block of another reversing switch when moving to a second position, so that the pressing block contacts with the corresponding trigger block.

By adopting the technical scheme, in the process that the belt drives the sliding beam to move, the abutting part moves along with the sliding beam, when the abutting part moves to the first position along with the sliding beam, the abutting part abuts against one pressing block, the pressing block abuts against the corresponding trigger block, so that the reversing switch at the position of the pressing block is opened, the motor changes the rotating direction, so that the belt moves along the opposite transportation direction, so that the sliding beam is driven to move towards the opposite direction, at the moment, the abutting part moves to the second position from the first position, when the abutting part reaches the second position, the abutting part abuts against the other pressing block, the pressing block abuts against the corresponding trigger block, so that the reversing switch at the position of the pressing block is opened, so that the motor changes the rotating direction again, so that the belt moves along the opposite transportation direction, and the sliding beam is driven to move towards the opposite direction.

The utility model discloses further set up to: the briquetting is provided with the roller, and the roller is used for contradicting with conflict piece, and the roller can rotate for conflict piece.

Through adopting above-mentioned technical scheme, the setting of roller can reduce the frictional force between contact piece and the briquetting, changes sliding friction power into rolling friction power, can increase the life of briquetting.

To sum up, the utility model discloses a beneficial technological effect does:

1. two belt motions of drive assembly simultaneous drive to the both ends motion of drive scraper blade, in order strickle off the liquid level, at this in-process, because the both ends of scraper blade are the drive section, so the scraper blade can not appear blocking, strickle off the effect better.

2. The four gears and the connecting piece are arranged, so that one motor can drive the two belts to move simultaneously, and energy is saved.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

Fig. 1 is a schematic overall structure diagram of a scraping plate mechanism for a 3D printer according to an embodiment of the present invention;

FIG. 2 is an enlarged partial schematic view of portion A of FIG. 1;

FIG. 3 is an enlarged partial schematic view of portion A1 of FIG. 2;

fig. 4 is a partially enlarged schematic view of a portion B in fig. 1.

Reference numerals: 1. a support; 2. a squeegee; 3. a belt; 31. a first belt; 32. a second belt; 4. a drive assembly; 41. a motor; 42. a first drive gear; 43. a second driving gear; 44. a first driven gear; 45. a second driven gear; 46. a connecting member; 5. a sliding beam; 51. a groove; 52. a guide portion; 521. a first guide portion; 522. a second guide portion; 523. a protrusion; 524. a strip-shaped inserting groove; 53. a belt pressing block; 6. a guide slide rail; 61. a first guide rail; 62. a second guide rail; 63. a strip-shaped chute; 7. a limiting block; 8. a reversing switch; 81. a trigger block; 82. briquetting; 83. a roller; 9. a contact member; 91. a guide slope.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, a 3D is scraper blade mechanism for printer includes support 1, scraper blade 2, belt 3 and drive assembly 4, and scraper blade 2, belt 3 and drive assembly 4 all set up on support 1. Specifically, in this embodiment, the support 1 is a rectangular or square frame and is made of stainless steel, the number of the belts 3 is two, and the two belts are respectively a first belt 31 and a second belt 32, the first belt 31 is movably installed at one end of the support 1, the second belt 32 is movably installed at the other end of the support 1, and the first belt 31 and the second belt 32 are arranged at two ends of the support 1 in parallel. The driving assembly 4 is used for driving the two belts 3 to move simultaneously. In addition, one end of the scraper blade 2 is detachably connected with the first belt 31, the other end of the scraper blade 2 is detachably connected with the second belt 32, so when the driving assembly 4 drives the two belts 3 to move simultaneously, because both ends of the scraper blade 2 are connected with the belts 3, the scraper blade 2 moves under the driving of the two belts 3, the lower end of the scraper blade 2 is in contact with the liquid level of resin, the scraper blade 2 scrapes the liquid level in the moving process, in the process, because both ends of the scraper blade 2 are the driving ends of the belts 3, the scraper blade 2 cannot be blocked and has a good scraping effect.

In order to realize that the driving assembly 4 drives the two belts 3 to move simultaneously, the first belt 31 and the second belt 32 are synchronous belts, as shown in fig. 1 and fig. 2, the driving assembly 4 includes a motor 41, a connecting member 46, a first driving gear 42, a second driving gear 43, a first driven gear 44 and a second driven gear 45 (shown in fig. 4), wherein the motor 41 can rotate in the forward direction or in the reverse direction. The first driving gear 42, the second driving gear 43, the first driven gear 44 and the second driven gear 45 are of the same type. The motor 41 is used for driving the first driving gear 42 to rotate. The connecting member 46 is rod-shaped, one end of the connecting member 46 is welded to the first driving gear 42, and the other end of the connecting member 46 is welded to the second driving gear 43. The first driving gear 42 and the first driven gear 44 are both meshed with the first belt 31, the first driving gear 42 is arranged at one end of the first belt 31, the first driven gear 44 is arranged at the other end of the first belt 31, the second driving gear 43 and the second driven gear 45 are both meshed with the first belt 31, the second driving gear 43 is arranged at one end of the first belt 31, and the second driven gear 45 is arranged at the other end of the first belt 31. When the motor 41 drives the first driving gear 42 to rotate, the first driving gear 42 drives the connecting member 46 to rotate, and the connecting member 46 drives the second driving gear 43 to rotate. Meanwhile, the first driving gear 42 drives the first belt 31 to move, the second driving gear 43 drives the second belt 32 to move, and the scraper 2 is driven to move when the first belt 31 and the second belt 32 move synchronously, so that the scraper 2 scrapes the liquid level. When the motor 41 changes the rotation direction, the first driving gear 42 is driven to rotate reversely to drive the connecting member 46 to rotate reversely, the connecting member 46 drives the second driving gear 43 to rotate reversely, and at the same time, the first belt 31 and the second belt 32 both move in opposite transportation directions to drive the scraper 2 to move reversely.

In order to mount the scraper 2 on the two belts 3 so that the scraper 2 and the belts 3 do not move relatively, as shown in fig. 1 and 4, the scraper 2 mechanism may further include a sliding beam 5 and a belt pressing block 53. The shape of the sliding beam 5 is a cuboid, two ends of the sliding beam 5 are provided with grooves 51, the bottoms of the grooves 51 are provided with a plurality of teeth, the bottoms of the grooves 51 are used for being meshed with the belt 3, one groove 51 is used for accommodating the first belt 31, and the other groove 51 is used for accommodating the second belt 32. The press block 53 is rectangular block, and the press block 53 is detachably connected to the opening of the groove 51, in this embodiment, the connection is a bolt connection. The number of the belt pressing blocks 53 is two, one belt pressing block 53 is for interfering with the non-toothed surface of the first belt 31, and the other belt pressing block 53 is for interfering with the non-toothed surface of the second belt 32. When the belt pressing blocks 53 are installed at the corresponding openings of the grooves 51, the teeth at the bottoms of the grooves 51 form clamping grooves to prevent the corresponding belts 3 from moving relative to the bottoms of the grooves 51. The scraper 2 is arranged on the sliding beam 5, in this embodiment the scraper 2 is mounted between two grooves 51 of the sliding beam 5 by screws, the scraper 2 is connected with the first belt 31 by the sliding beam 5, and the scraper 2 is connected with the second belt 32 by the sliding beam 5.

Since the resin is viscous, the blade 2 receives a large resistance during the movement of the blade 2, and the blade 2 tends to shake during the movement. As shown in fig. 1 and 4, the scraper 2 mechanism may further include a guide rail 6, and the guide rail 6 is a strip-shaped protrusion 523. The guide rail 6 is arranged on the support 1, in the present embodiment by means of bolts, on the support 1. The number of the guide slide rails 6 is two, the two guide slide rails are respectively a first guide rail 61 and a second guide rail 62, the first guide slide rail 6 is arranged at one end of the first belt 31 far away from the second belt 32, the second guide slide rail 6 is arranged at one end of the second belt 32 far away from the first belt 31, the two guide slide rails 6 are arranged in parallel, and the length directions of the two guide slide rails are consistent with the conveying direction of the belt 3; the sliding beam 5 is further provided with a guide portion 52, and the guide portion 52 is a rectangular parallelepiped block having a strip-shaped insertion groove 524. The number of the guide portions 52 is two, and the guide portions are respectively a first guide portion 521 and a second guide portion 522, and the first guide portion 521 and the second guide portion 522 are respectively arranged at two ends of the sliding beam 5; the first guiding part 521 is inserted into the first guiding slide rail 6 through the strip insertion groove 524, the second guiding part 522 is inserted into the second guiding slide rail 6 through the strip insertion groove 524, and the guiding parts 52 can move along the length direction of the corresponding guiding slide rail 6. Thus, during the movement of the blade 2, the blade 2 moves along the length of the guide rail 6 to prevent the blade 2 from shaking. In order to prevent the guide portion 52 from separating from the guide slide rail 6 in the process of the guide portion 52 moving along the corresponding guide slide rail 6, which results in the deviation of the moving direction of the scraper 2, the guide slide rail 6 may be provided with a strip-shaped sliding groove 63, and the length direction of the strip-shaped sliding groove 63 is consistent with the length direction of the guide slide rail 6 where the strip-shaped sliding groove 63 is located. Correspondingly, the side walls of the strip-shaped insertion grooves 524 of the guide part 52 are provided with protrusions 523, the protrusions 523 are used for being inserted into the corresponding strip-shaped sliding grooves 63, and the protrusions 523 can move relative to the strip-shaped sliding grooves 63.

As shown in fig. 2, in order to prevent the bracket 1 from colliding with the scraper 2 and the scraper 2 from being damaged due to the excessive rotation of the belt 3, it is also effective to prevent the sliding beam 5 from colliding with the motor 41 due to the excessive movement of the timing belt. The bracket 1 can be provided with a limiting block 7, and the limiting block 7 can be connected with the bracket 1 through a bolt. The limiting block 7 may be a rectangular cylinder, the limiting block 7 is disposed at one end of the second belt 32 far away from the first belt 31, and the limiting block 7 is used for abutting against the second guiding portion 522. This prevents the guide shoe from colliding with the motor 41 while restricting the position of the slide cross member 5. The number of the limiting blocks 7 is two, and the limiting blocks are respectively arranged at two ends of the second guide rail 62.

In order to facilitate the change of the forward rotation and the reverse rotation of the motor 41 so as to change the conveying direction of the belt 3, as shown in fig. 2 and 3, the scraper 2 mechanism further includes two reversing switches 8, the number of the reversing switches 8 is two, the reversing switches 8 are all arranged on the bracket 1, one of the reversing switches 8 is used for controlling the motor 41 to rotate forward, and the other reversing switch 8 is used for controlling the motor 41 to rotate reversely. Specifically, each reversing switch 8 is provided with a trigger block 81 and a pressing block 82, and a gap is formed between each pressing block 82 and the corresponding trigger block 81; the pressing block 82 has elasticity, when the pressing block 82 is extruded by external force, the pressing block 82 deforms to abut against the trigger block 81, the reversing switch 8 where the pressing block is located is turned on at the moment, and the reversing switch 8 enables the motor 41 to rotate forwards or backwards correspondingly. For opening corresponding reversing switch 8 more timely, sliding beam 5 is installed and is supported 9, support 9 can be bar platelike, in the process of sliding beam 5 motion, drive support 9 motion, support 9 is used for moving and is supported with briquetting 82 of a reversing switch 8 when reaching the first position, so that briquetting 82 is supported with corresponding trigger block 81, this reversing switch 8 opens, motor 41 rotates the direction change, belt 3 drives sliding beam 5 reverse motion, support 9 this moment and remove to the second position by the first position. The contact element 9 is used for abutting against the pressing block 82 of another reversing switch 8 when moving to the second position, so that the pressing block 82 abuts against the corresponding trigger block 81, the reversing switch 8 is turned on, the rotation direction of the motor 41 changes, the belt 3 drives the sliding beam 5 to move reversely, and at the moment, the contact element 9 moves from the second position to the first position. In the process, the scraper 2 scrapes the liquid surface. In order to reduce the friction between the contact piece 9 and the pressing block 82, the roller 83 is installed on the pressing block 82, the roller 83 is used for being collided with the collision piece 9, the roller 83 can rotate relative to the contact piece 9, the roller 83 is damaged in order to prevent the contact piece 9, the collision piece 9 is provided with a guide inclined plane 91, in the process of movement of the collision piece 9, the guide inclined plane 91 rotates relative to the roller 83, the roller 83 is extruded simultaneously, the roller 83 drives the pressing block 82 to deform, and therefore the pressing block 82 is collided with the trigger block 81.

The working process and the implementation principle of the embodiment are as follows: the motor 41 drives the first driving gear 42 to rotate, the first driving gear 42 drives the connecting member 46 to rotate, and the connecting member 46 drives the second driving gear 43 to rotate. Meanwhile, the first driving gear 42 drives the first belt 31 to move, the second driving gear 43 drives the second belt 32 to move and drives the sliding beam 5 connected with the first driving gear and the second driving gear to move simultaneously, and the sliding beam 5 drives the scraper 2 to move, so that the scraper 2 is capable of smoothing the liquid level. In this process, guide portion 52 moves in the lengthwise direction of guide rail 6 to prevent belt 3 from shaking to cause blade 2 to shake. In addition, the limiting block 7 can prevent the guide block from colliding with the motor 41. In addition, in the moving process of the sliding beam 5, the contact piece 9 on the sliding beam moves along with the sliding beam 5, when the sliding beam is about to move to the first position, the guide inclined plane 91 of the contact piece 9 contacts with the roller 83, then the contact piece 9 continues to move, the roller 83 is contacted and pressed, the pressing block 82 is deformed, the pressing block 82 contacts with the trigger block 81, the reversing switch 8 is started, at this time, the motor 41 changes the rotating direction, and the sliding beam 5 moves along with the belt 3 in the direction of the second position in a reversing way. Similarly, when the abutting member 9 is at the second position, the other reversing switch 8 is turned on, and the motor 41 changes the rotating direction. In this process, the scraper 2 scrapes the liquid surface.

Here, it should be noted that: in the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a 3D is scraping plate mechanism for printer which characterized in that: the scraper comprises a support (1), a scraper (2), a belt (3) and a driving component (4), wherein the scraper (2), the belt (3) and the driving component (4) are all arranged on the support (1);

the number of the belts (3) is two, and the belts are respectively a first belt (31) and a second belt (32), the first belt (31) is arranged at one end of the support (1), and the second belt (32) is arranged at the other end of the support (1);

the driving assembly (4) is used for driving the two belts (3) to move simultaneously;

one end of the scraper (2) is detachably connected with the first belt (31), and the other end of the scraper (2) is detachably connected with the second belt (32).

2. The squeegee mechanism for a 3D printer according to claim 1, characterized in that: the first belt (31) and the second belt (32) are synchronous belts, and the first belt (31) and the second belt (32) are arranged at two ends of the support (1) in parallel;

the driving assembly (4) comprises a motor (41), a connecting piece (46), a first driving gear (42), a second driving gear (43), a first driven gear (44) and a second driven gear (45);

the motor (41) is used for driving the first driving gear (42) to rotate;

the first driving gear (42) is connected with the second driving gear (43) through a connecting piece (46);

the first driving gear (42) and the first driven gear (44) are meshed with the first belt (31), the first driving gear (42) is arranged at one end of the first belt (31), and the first driven gear (44) is arranged at the other end of the first belt (31);

the second driving gear (43) and the second driven gear (45) are both meshed with the first belt (31), the second driving gear (43) is arranged at one end of the first belt (31), and the second driven gear (45) is arranged at the other end of the first belt (31).

3. The squeegee mechanism for a 3D printer according to claim 2, characterized in that: the device also comprises a sliding beam (5) and a belt pressing block (53), wherein grooves (51) are formed in two ends of the sliding beam (5);

the bottom of the groove (51) is provided with a plurality of teeth, the bottom of the groove (51) is used for being meshed with the synchronous belt, one groove (51) is used for accommodating the first belt (31), and the other groove (51) is used for accommodating the second belt (32);

the belt pressing blocks (53) are detachably connected with the opening of the groove (51), one belt pressing block (53) is used for abutting against the first belt (31), and the other belt pressing block (53) is used for abutting against the second belt (32);

the scraper (2) is arranged on the sliding cross beam (5), the scraper (2) is connected with the first belt (31) through the sliding cross beam (5), and the scraper (2) is connected with the second belt (32) through the sliding cross beam (5).

4. The squeegee mechanism for a 3D printer according to claim 3, characterized in that: the belt conveyor is characterized by further comprising two guide slide rails (6), wherein the guide slide rails (6) are arranged on the support (1), the number of the guide slide rails (6) is respectively a first guide rail (61) and a second guide rail (62), the first guide slide rail (6) is arranged at one end, far away from the second belt (32), of the first belt (31), and the second guide slide rail (6) is arranged at one end, far away from the first belt (31), of the second belt (32);

the two guide slide rails (6) are arranged in parallel, and the length directions of the two guide slide rails are consistent with the conveying direction of the belt (3); the sliding beam (5) is further provided with two guide parts (52), the number of the guide parts (52) is two, the two guide parts are respectively a first guide part (521) and a second guide part (522), and the first guide part (521) and the second guide part (522) are respectively arranged at two ends of the sliding beam (5);

the first guide part (521) is connected with the first guide sliding rail (6) in an inserting mode, the second guide part (522) is connected with the second guide sliding rail (6) in an inserting mode, and the guide parts (52) can move along the length direction of the guide sliding rail (6).

5. The squeegee mechanism for a 3D printer according to claim 4, wherein: the guide sliding rails (6) are respectively provided with a strip-shaped sliding chute (63), and the length direction of each strip-shaped sliding chute (63) is consistent with the length direction of the guide sliding rail (6) where the strip-shaped sliding chute is located;

the guide parts (52) are provided with protrusions (523), the protrusions (523) are used for being connected with the corresponding strip-shaped sliding grooves (63) in an inserting mode, and the protrusions (523) can move relative to the strip-shaped sliding grooves (63).

6. The squeegee mechanism for a 3D printer according to claim 4, wherein: the support (1) is provided with a limiting block (7), and the limiting block (7) is used for abutting against the second guide part (522).

7. The squeegee mechanism for a 3D printer according to claim 6, wherein: the motor is characterized by further comprising two reversing switches (8), wherein the reversing switches (8) are arranged on the support (1), one reversing switch (8) is used for controlling the motor (41) to rotate forwards, and the other reversing switch (8) is used for controlling the motor (41) to rotate backwards.

8. The squeegee mechanism for a 3D printer according to claim 7, wherein: the reversing switches (8) are provided with trigger blocks (81) and pressing blocks (82), and gaps are reserved between the pressing blocks (82) and the corresponding trigger blocks (81); the pressing block (82) has elasticity, and the pressing block (82) is used for opening the reversing switch (8) when colliding with the corresponding trigger block (81);

the sliding beam (5) is provided with a contact piece (9), the contact piece (9) is used for being contacted with a pressing block (82) of one reversing switch (8) when moving to a first position, so that the pressing block (82) is contacted with a corresponding trigger block (81), and the contact piece (9) is used for being contacted with a pressing block (82) of another reversing switch (8) when moving to a second position, so that the pressing block (82) is contacted with the corresponding trigger block (81).

9. The squeegee mechanism for a 3D printer according to claim 8, wherein: the pressing block (82) is provided with a roller (83), the roller (83) is used for abutting against the abutting piece (9), and the roller (83) can rotate relative to the abutting piece (9).