CN114851558A

CN114851558A - Scraper and 3D printer

Info

Publication number: CN114851558A
Application number: CN202210469384.6A
Authority: CN
Inventors: 肖静宇; 薛智升; 郭广浩; 陈志茹; 高桦; 周天双; 计霞; 刘慧渊; 沈于蓝; 周德敬
Original assignee: Falcontech Co ltd
Current assignee: Falcontech Co ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-08-05

Abstract

The invention relates to the technical field of 3D printing, and particularly discloses a scraper and a 3D printer. Wherein, be equipped with the fixing base on a lateral wall of casing, seted up the holding tank along the length direction of fixing base. Part of the scraping strip is arranged in the accommodating groove. The winding wheel hubs are rotatably connected with the shell, the number of the winding wheel hubs is two, and two ends of the scraping strip are respectively wound on the two winding wheel hubs. The driving device is arranged on the shell and is configured to drive the two winding hubs to synchronously rotate along the same direction. Above-mentioned scraper can change the scraping strip automatically, is favorable to improving the processingquality and the machining efficiency of part.

Description

Scraper and 3D printer

Technical Field

The invention relates to the technical field of 3D printing, in particular to a scraper and a 3D printer.

Background

When a 3D printing method is adopted to process parts, a three-dimensional model of the part to be molded is generally cut into various two-dimensional models in a computer system according to a certain thickness in the height direction, and then the laser interacts with a powder bed according to a two-dimensional digital model under the action of an industrial personal computer to enable the powder to be rapidly melted and solidified to form the shape of the current layer. Because different positions of the three-dimensional model are heated and transferred heat differently in the printing process, shapes and thin-wall structures smaller than 45 degrees are deformed such as warping and the like due to unbalanced heating in the process of rapid powder solidification, and 3D printing is a layer-by-layer accumulation process, and when warping is gradually accumulated to the collision of a powder spreading scraper and a workpiece, the scraper system can be damaged, the smoothness of a powder spreading surface is affected, and finally printing scrapping is caused.

At present, if the phenomenon occurs in the printing process, only the scraping strip on the scraper blade system can be replaced, and then the printing is continued. When the scraping strip is replaced, the scraper system is required to be detached from the 3D printer, then the scraping strip is replaced, the scraper system is installed in the 3D printer after the scraping strip is replaced, the leveling is performed again (the powder spreading plane position is found), finally, the bin door is closed, the inert gas is flushed again, and then the printing is performed. For small equipment, the replacement of the scraper bar takes 30min to 1 h. The time is 2-3h for large-scale equipment, and the bin door needs to be opened in the replacement process, so that the temperature field of parts can be changed to generate joint marks on printing, and for parts with internal flow channels and thin-wall structures, the joint marks can cause unqualified fluorescence and ray detection.

Therefore, it is desirable to provide a scraper to solve the above problems.

Disclosure of Invention

According to one aspect of the invention, the scraper can automatically replace the scraper bar, and is beneficial to improving the processing quality and the processing efficiency of parts.

In order to achieve the purpose, the invention adopts the following technical scheme:

a doctor blade, comprising:

the shell is provided with a fixed seat on one side wall, and a containing groove is formed in the length direction of the fixed seat;

the scraping strip is partially arranged in the accommodating groove;

the winding hubs are rotatably connected with the shell, the number of the winding hubs is two, and two ends of the scraping strip are respectively wound on the two winding hubs;

a drive device disposed on the housing, the drive device configured to drive the two winding hubs to rotate synchronously in the same direction.

Optionally, the scraping device further comprises a plurality of guide wheels, the guide wheels are rotatably connected with the shell, the guide wheels are arranged at one end or two ends of the fixing seat, and the scraping strip is connected with the guide wheels in a winding mode.

Optionally, the number of the guide wheels is two, and the two guide wheels are respectively arranged at two ends of the fixed seat.

Optionally, the axis of the part of the scraping strip wound between the guide wheel and the outer edge of the fixed seat coincides with the axis of the part of the scraping strip in the accommodating groove.

Optionally, the scraping strip is cylindrical, the accommodating groove is arc-shaped, and the arc-shaped accommodating groove is tightly attached to the circumferential surface of the scraping strip.

Optionally, the driving device includes a first motor, a first rotating shaft, a second rotating shaft, and a synchronous belt;

the utility model discloses a take-up device, including casing, first pivot, second pivot, hold-in range cover, first pivot with the second pivot all with the casing rotates to be connected, the one end of first pivot with one winding wheel hub links to each other, the one end and another of second pivot winding wheel hub links to each other, the hold-in range cover is located the other end of first pivot and the other end of second pivot, the output of first motor with first pivot transmission is connected, in order to drive first pivot rotates.

Optionally, the other end of first pivot is equipped with first gear, the other end of second pivot is equipped with the second gear, the hold-in range is the profile of tooth hold-in range, the profile of tooth hold-in range with first gear with the meshing of second gear.

Optionally, a first motor, a second motor, a first rotating shaft and a second rotating shaft are included;

the first pivot with the second pivot all with the casing rotates to be connected, the one end of first pivot with one coiling wheel hub links to each other, the one end and another of second pivot coiling wheel hub links to each other, the output of first motor with first pivot transmission is connected, in order to drive first pivot is rotated, the output of second motor with second pivot transmission is connected, in order to drive the second pivot is rotated.

Optionally, the shell comprises a cover plate, a first flange, a second flange and a third flange;

the cover plate is rectangular, the first flanging, the second flanging and the third flanging are respectively connected with the first side wall, the second side wall and the third side wall of the cover plate, and the fixed seat is connected with the fourth side wall of the cover plate;

the first flanging, the second flanging, the third flanging and the fixing seat are surrounded to form an accommodating space, and the winding hub is arranged in the accommodating space.

According to another aspect of the invention, the invention also provides a 3D printer, which comprises the scraper blade. This 3D printer need not to open the door and can change the scraper automatically, has improved the printing quality and the machining efficiency of part.

The beneficial effects of the invention are as follows:

the invention provides a scraper, which comprises a shell, a scraping strip, a winding hub and a driving device. Set up the fixing base on the casing, the powder of spreading when being used for 3D to print is installed in the holding tank on the fixing base to part scraping strip. The two ends of the scraping strips are respectively connected with the two winding hubs in a winding mode, the driving device is arranged to drive the two winding hubs to rotate in the same direction and synchronously, when the scraping strips located in the accommodating groove are partially damaged, the driving device can drive the winding hubs to rotate and then move the scraping strips of the damaged parts to the position away from the accommodating groove, the scraping strips which are not damaged are moved to the accommodating groove, the purpose of automatically replacing the scraping strips in the accommodating groove in a working mode is achieved, the replacing efficiency of the scraping strips is improved, and the production efficiency of parts is further improved.

The invention further provides a 3D printer which comprises the scraper. When the scraping strip in the 3D printer damaged, the scraping strip that can change automatically continues to print, compares with traditional manual change scraping strip, has shortened maintenance duration, has improved the machining efficiency of part. And the bin door does not need to be opened when the scraping strip is replaced, so that the condition that parts are welded or even scrapped due to the change of a temperature field is avoided, and the quality of the parts is ensured.

Drawings

Fig. 1 is a first schematic structural diagram (showing a scraping bar) of a scraper blade provided by a first embodiment of the present invention;

fig. 2 is a bottom view of a scraper blade according to an embodiment of the present invention;

fig. 3 is a partial schematic view of a scraper blade according to a first embodiment of the present invention (the scraper bar is not shown);

fig. 4 is a schematic structural diagram (showing a scraping bar) of a scraper according to a first embodiment of the present invention.

In the figure:

100. a housing; 110. a fixed seat; 111. accommodating grooves; 120. a cover plate; 130. a first flanging; 140. second flanging; 150. third flanging; 200. scraping the strip; 300. winding the hub; 400. a drive device; 410. a first motor; 420. a first rotating shaft; 421. a first gear; 430. a second rotating shaft; 431. a second gear; 440. a synchronous belt; 500. a guide wheel.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.

Example one

The invention provides a scraper which can automatically replace a scraping strip 200 and is beneficial to improving the processing quality and the processing efficiency of parts.

Specifically, as shown in fig. 1-3, the scraper blade includes a housing 100, a scraper bar 200, a winding hub 300, and a drive 400. Wherein, a fixing seat 110 is disposed on one side wall of the housing 100, an accommodating groove 111 is disposed on the fixing seat 110, and a part of the wiper strip 200 is mounted in the accommodating groove 111. The scraping bar 200 installed in the accommodating groove 111 is a working part and used for powder laying during 3D printing, and the fixing seat 110 can support the scraping bar 200 because the scraping bar 200 is generally made of soft materials, so that the scraping bar 200 is prevented from deforming under the condition of stress, and the working reliability of the scraping bar 200 is ensured. The winding hub 300 is rotatably connected to the housing 100, and two ends of the wiper strip 200 are respectively wound around the winding hub 300. That is, when the bar 200 is installed, one end of the bar 200 is wound on one winding hub 300, then partially installed in the receiving groove 111 and fixed, and finally the other end is wound on the other winding hub 300. The driving device 400 is disposed on the housing 100, and the driving device 400 can drive the two winding hubs 300 to rotate in the same direction and synchronously. When the scraping bar 200 in the accommodating groove 111 is partially damaged, the driving device 400 controls the winding hubs 300 to synchronously rotate (rotate forwards or reversely) in the same direction, so that the scraping bar 200 released by one of the winding hubs 300 is released, and the scraping bar 200 of the damaged part is separated from the accommodating groove 111 by the other jig dyeing hub in the process of winding the scraping bar 200 in the other winding hub, so that the undamaged scraping bar 200 is installed in the accommodating groove 111, and further, the automatic replacement of the scraping bar 200 is realized.

Further, with continued reference to fig. 1, the driving device 400 includes a first motor 410, a first rotating shaft 420, a second rotating shaft 430, and a timing belt 440. The first rotating shaft 420 is rotatably connected to the housing 100, and one end of the first rotating shaft is connected to a winding hub 300, and the winding hub 300 rotates along with the rotation of the first rotating shaft 420. The second rotating shaft 430 is rotatably connected to the housing 100, and has one end connected to another winding hub 300, and the winding hub 300 rotates with the rotation of the second rotating shaft 430. The synchronous belt 440 is sleeved at the other ends of the first rotating shaft 420 and the second rotating shaft 430, and the output end of the first motor 410 is in transmission connection with the first rotating shaft 420 and can drive the first rotating shaft 420 to rotate. When the first motor 410 drives the first rotating shaft 420 to rotate, the second rotating shaft 430 can be driven to rotate in the same direction and synchronously under the action of the synchronous belt 440, so that the damaged scraping strip 200 in the accommodating groove 111 can be removed from the accommodating groove 111, and the undamaged scraping strip 200 can be replaced in the accommodating groove 111.

Specifically, in the present embodiment, the first rotating shaft 420 and the second rotating shaft 430 are both disposed through the casing 100, so that the two winding hubs 300 and the driving device 400 are disposed on two side surfaces of the casing 100, which is convenient for assembly. Of course, in other embodiments, the winding hub 300 and the driving device 400 may be disposed on the same side, and may be disposed according to actual requirements.

Preferably, in order to ensure reliability of belt transmission between the first motor 410 and the first and second

rotating shafts

420 and 430. A first gear 421 may be provided at the other end of the first rotation shaft 420, a second gear 431 may be provided at the other end of the second rotation shaft 430, and a tooth-shaped timing belt may be selected, which is engaged with the first gear 421 and the second gear 431. Through the gear tradition, can avoid hold-in range 440 because of the unable pivoted problem of coiling wheel hub 300 that results in that skids, improve two coiling wheel hub 300 syntropy and synchronous rotation's reliability, and then improve the automatic reliability of changing the work of scraping strip 200 of above-mentioned scraper.

Alternatively, the first gear 421 may be connected to the first rotating shaft 420 by welding, and the second gear 431 may be connected to the second rotating shaft 430 by welding, so that the welding operation is simple, the structure is stable, and the cost is low. Of course, the first gear 421 may also be connected to the first rotating shaft 420 by other means, such as bolt connection, and the second rotating shaft 430 may also be connected to the second rotating shaft 430 by other means, such as bolt connection, which may be set according to actual requirements.

Further, in one embodiment, the fixing base 110 may be a fixing plate extending along a length direction of the sidewall of the housing 100. And the fixing plate and the side wall of the shell 100 are arranged on the same plane, which is beneficial to ensuring that part of the scraping strip 200 is arranged in the accommodating groove 111, and part of the scraping strip protrudes out of the side wall of the shell 100, so that the powder spreading work of the scraping strip 200 is facilitated. If the wiper strip 200 does not partially protrude from the housing 100, it cannot operate.

Optionally, the fixing base 110 may be connected to the housing 100 by welding, may also be connected to the housing 100 by bolt connection, and may also be connected to the housing 100 by clamping, and the fixing base 110 may be arranged according to actual needs, as long as the fixing base 110 can be fixedly connected to the housing 100, which is within the protection scope of the present application.

Preferably, for convenience of understanding, the wiper strip 200 located between the end of the fixing base 110 and the winding hub 300 is defined as a wiper strip 200a, and the wiper strip 200 located in the receiving groove 111 is defined as a wiper strip 200b, and since the two ends of the fixing base 110 are right angles in this embodiment, an angle c between the wiper strip 200a and the wiper strip 200b may be set to be greater than 90 ° and equal to or less than 180 °, so as to avoid the contact between the wiper strip 200b and the side wall of the fixing base 110 adjacent to the receiving groove 111, reduce the contact area between the end of the fixing base 110 and the wiper strip 200, and further reduce the friction between the end of the fixing base 110 and the wiper strip 200.

In a most preferred embodiment, with continued reference to fig. 1 and 2, the scraper further comprises a plurality of guide wheels 500, and the plurality of guide wheels 500 are connected to the housing 100 and can rotate around their axes relatively. The bar 200 is wound around the guide wheel 500. A plurality of guide wheels 500 may be provided at one side or both sides of the fixing base 110. Specifically, taking the guide wheels 500 disposed on both sides of the fixing base 110 as an example, when the scraping bar 200 is installed, one end of the scraping bar is wound on one winding hub 300, then the guiding wheel 500 on one side of the fixing base 110 is wound, then the scraping bar is partially installed in the accommodating groove 111, and then the guiding wheel 500 on the other side of the fixing base 110 is wound, and finally the other end of the scraping bar 200 is wound on the other winding hub 300.

By arranging the guide wheel 500, on one hand, the movement of the scraping strip 200a can be guided, and the reliability of the work of winding the winding hub 300 and releasing the scraping strip 200 is ensured; on the other hand, the movement of the wiper strip 200a can be made smoother by the rotation of the guide wheel 500.

Further, in the present embodiment, two guide wheels 500 are provided, and the two guide wheels 500 are respectively disposed at two ends of the fixing base 110 to guide the movement of the wiper strip 200a located at two sides of the fixing base 110. Of course, in other embodiments, the number and arrangement of the guide wheels 500 may be other, and the guide wheels may be arranged according to actual needs.

Preferably, with continued reference to fig. 2, in order to prevent the scraping bar 200a from being damaged due to hard contact with the outer edge of the fixing seat 110 during the moving process, the axis of the scraping bar 200 wound between the guide wheel 500 and the fixing seat 110 may be arranged to coincide with the axis of the scraping bar 200 installed in the accommodating groove 111, so that the scraping bar 200 wound between the guide wheel 500 and the fixing seat 110 and the scraping bar 200 installed in the accommodating groove 111 are aligned, and the service life of the scraping bar 200 is prolonged.

Alternatively, the guide wheel 500 may be connected to the housing 100 by a third rotation shaft. Specifically, one end of the third rotating shaft is connected to the housing 100, and the other end is rotatably connected to the guide wheel 500. A bearing seat can be arranged between the guide wheel 500 and the third rotating shaft, and the guide wheel 500 can rotate relative to the third rotating shaft through the bearing seat.

Preferably, as shown in fig. 3, since the scraper bar 200 is generally cylindrical, the accommodating groove 111 may be formed in an arc shape, and the arc-shaped accommodating groove 111 is engaged with the scraper bar 200, so that the arc-shaped accommodating groove 111 is closely attached to the circumferential surface of the scraper bar 200. On one hand, the scraper bar 200 can be easily installed in the accommodating groove 111; on the other hand, the wiper strip 200 can be restricted from coming off the accommodating groove 111 by the arc surface of the arc accommodating groove 111.

Further, as shown in fig. 4, the housing 100 includes a cover plate 120, a first flange 130, a second flange 140, and a third flange 150. The cover plate 120 is rectangular, the first flange 130 is connected to a first sidewall of the cover plate 120, the second flange 140 is connected to a second sidewall of the cover plate 120, the third flange 150 is connected to a third sidewall of the cover plate 120, and the fixing base 110 is connected to a fourth sidewall of the cover plate 120. And first turn-ups 130, second turn-ups 140, third turn-ups 150 and fixing base 110 enclose into accommodation space, and winding wheel 300 sets up in accommodation space, is favorable to improving the compact structure nature of above-mentioned scraper to protect winding wheel 300, guarantee winding wheel 300 reliability of working.

Example two

The present embodiment provides a scraper, which has substantially the same structure as that of the first embodiment, and is improved on the basis of the first embodiment. Therefore, only the difference between the two embodiments will be described, and the same structure as that of the embodiment will not be described herein again.

In the present embodiment, the driving device 400 includes a first motor 410, a second motor, a first rotating shaft 420, and a second rotating shaft 430. Wherein the first rotating shaft 420 is rotatably connected to the housing 100, and one end of the first rotating shaft 420 is connected to a winding hub 300, the winding hub 300 being rotated by the rotation of the first rotating shaft 420. The second rotating shaft 430 is rotatably connected to the housing 100, and has one end connected to another winding hub 300, and the winding hub 300 rotates with the rotation of the second rotating shaft 430. The output end of the first motor 410 is in transmission connection with the first rotating shaft 420 and can drive the first rotating shaft 420 to rotate. The output end of the second motor is in transmission connection with the second rotating shaft 430 and can drive the second rotating shaft 430 to rotate. When the wiper strip 200 is replaced, the first motor 410 and the second motor rotate synchronously and in the same direction, so that the two winding hubs 300 rotate synchronously and in the same direction.

EXAMPLE III

This embodiment improves a 3D printer, includes foretell scraper. When the scraping bar 200 in the 3D printer is damaged, the scraping bar 200 which can be automatically replaced can be continuously printed, and compared with the traditional scraping bar 200 which is manually replaced, the repairing time is shortened, and the processing efficiency of parts is improved. And the bin door does not need to be opened when the scraping strip 200 is replaced, so that the condition that parts are welded or even scrapped due to the change of a temperature field is avoided, and the quality of the parts is ensured.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A doctor blade, comprising:

the shell comprises a shell (100), wherein a fixed seat (110) is arranged on one side wall of the shell (100), and an accommodating groove (111) is formed in the length direction of the fixed seat (110);

the scraping strip (200), some said scraping strips (200) are mounted in said holding groove (111);

the winding hubs (300) are rotatably connected with the shell (100), two winding hubs (300) are arranged, and two ends of the scraping strip (200) are respectively wound on the two winding hubs (300);

a drive arrangement (400), the drive arrangement (400) being provided on the housing (100), the drive arrangement (400) being configured to be able to drive the two winding hubs (300) to rotate synchronously in the same direction.

2. The scraper blade according to claim 1, further comprising a plurality of guide wheels (500), wherein a plurality of guide wheels (500) are rotatably connected with the housing (100), and a plurality of guide wheels (500) are arranged at one end or both ends of the fixed base (110), and the scraper bar (200) is wound and connected with the guide wheels (500).

3. The doctor blade as claimed in claim 2, characterized in that the guide wheels (500) are provided in two, the two guide wheels (500) being provided at each end of the holder (110).

4. A scraper blade according to claim 3, characterized in that the part of the scraper bar (200) wound between the guide wheel (500) and the outer edge of the holder (110) coincides with the axis of the part of the scraper bar (200) within the receiving groove (111).

5. A scraper blade according to claim 1, characterized in that the scraper bar (200) is cylindrical and the receiving groove (111) is arc-shaped, the arc-shaped receiving groove (111) closely following the circumferential surface of the scraper bar (200).

6. A doctor blade as claimed in any of claims 1-5, characterized in that the drive means (400) comprise a first motor (410), a first shaft (420), a second shaft (430) and a timing belt (440);

first pivot (420) with second pivot (430) all with casing (100) rotate and connect, the one end and one of first pivot (420) wind wheel hub (300) and link to each other, the one end and another of second pivot (430) wind wheel hub (300) and link to each other, hold-in range (440) cover is located the other end of first pivot (420) and the other end of second pivot (430), the output of first motor (410) with first pivot (420) transmission is connected, in order to drive first pivot (420) rotates.

7. The doctor blade as claimed in claim 6, wherein the other end of the first rotary shaft (420) is provided with a first gear (421), the other end of the second rotary shaft (430) is provided with a second gear (431), and the timing belt (440) is a toothed timing belt (440), and the toothed timing belt (440) is engaged with the first gear (421) and the second gear (431).

8. A scraper blade according to any of claims 1-5, characterized by comprising a first motor (410), a second motor, a first shaft (420) and a second shaft (430);

first pivot (420) with second pivot (430) all with casing (100) rotate to be connected, the one end and one of first pivot (420) wind wheel hub (300) and link to each other, the one end and another of second pivot (430) wind wheel hub (300) and link to each other, the output of first motor (410) with first pivot (420) transmission is connected, in order to drive first pivot (420) rotate, the output of second motor with second pivot (430) transmission is connected, in order to drive second pivot (430) rotate.

9. A scraper blade according to any of claims 1-5, characterized in that the housing (100) comprises a cover plate (120), a first turn-up (130), a second turn-up (140) and a third turn-up (150);

the cover plate (120) is rectangular, the first flanging (130), the second flanging (140) and the third flanging (150) are respectively connected with a first side wall, a second side wall and a third side wall of the cover plate (120), and the fixed seat (110) is connected with a fourth side wall of the cover plate (120);

the first flanging (130), the second flanging (140), the third flanging (150) and the fixing seat (110) are arranged in a surrounding mode to form an accommodating space, and the winding hub (300) is arranged in the accommodating space.

10. 3D printer characterized in that it comprises a doctor blade according to any one of claims 1 to 9.