Spare scraper replacing device of 3D printer

Abstract

The utility model relates to a spare scraper replacement device of 3D printer, including scraper replacement mechanism and drive mechanism, scraper replacement mechanism includes knife rest shaft, fixed subassembly and scraper, the fixed subassembly is fixed on the peripheral surface of knife rest shaft, and the fixed subassembly is equipped with 2 < = N < = 4, the N fixing assemblies are arranged at intervals in the circumferential direction of the knife rest shaft, the phase angle of any two adjacent fixing assemblies in the circumferential direction of the knife rest shaft is larger than or equal to 90 degrees, the scrapers are detachably and fixedly installed on the fixing assemblies, the number of the scrapers is M, the scrapers are installed on the M fixing assemblies respectively, M is smaller than or equal to N, and the M is larger than or equal to N. The driving mechanism is connected with the tool rest shaft and can drive the tool rest shaft to rotate.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing equipment, and in particular to a spare scraper replacement device for a 3D printer. Background Art

[0002] Selective Laser Melting (SLM) is an important branch of metal 3D printing technology. It uses a laser beam to precisely selectively melt metal powder to build three-dimensional objects layer by layer.

[0003] In traditional 3D printers, a conventional way of supplying metal powder is top powder feeding, that is, metal powder falls from the top of the 3D printer onto the printing area. A conventional path of top powder feeding is: the metal powder is transported to the powder storage unit by the powder feeding mechanism, the powder storage unit supplies a certain amount of metal powder to the powder spreading device, and then the powder spreading device evenly spreads the metal powder on the printing area, and the laser beam selectively melts the metal powder on the printing area according to the contour information of the current layer, so as to process and shape the contour of the current layer, and then the powder spreading device spreads a new layer of metal powder on the processed current layer, and the laser beam continues to process the new layer; in the traditional powder spreading device, the unit that performs the powder spreading action is the powder spreading scraper, however, since the metal 3D printing technology requires layer-by-layer processing, the powder spreading scraper is often used very frequently, so after a long period of work, the powder spreading scraper is very easy to be damaged or severely worn, thereby affecting the powder spreading effect of the 3D printer and the success rate of processing and forming, so it is necessary to regularly replace the new powder spreading scraper.

[0004] Traditional powder spreading scrapers are difficult to disassemble and require shutdown for replacement. After replacement, the powder spreading scraper needs to be leveled. Usually, a scraper leveling mechanism is used to adjust the parallelism of the powder spreading scraper so that the thickness of the metal powder spread by the two powder spreading scrapers before and after replacement can be consistent, thereby ensuring the powder spreading effect and the success rate of processing and forming. However, each replacement of a new powder spreading scraper not only requires shutdown, but also takes a lot of time to replace. After replacement, it takes extra time to level the scraper. This is the difficulty and pain point encountered by traditional powder spreading scrapers in the actual working process, which not only greatly wastes manpower and time, but also seriously affects the processing efficiency of 3D printers. Utility Model Content

[0005] In view of the defects of the prior art mentioned above, the technical problem to be solved by the utility model is to provide a spare scraper replacement device for a 3D printer, which can automatically complete the scraper replacement work without stopping the machine, and can ensure that the thickness of the metal powder spread by the two scrapers before and after replacement remains consistent.

[0006] To achieve the above-mentioned purpose, the utility model provides a spare scraper replacement device for a 3D printer, comprising a scraper replacement mechanism and a driving mechanism, the scraper replacement mechanism comprising a tool holder shaft, a fixed component and a scraper, the fixed component is fixedly mounted on the outer circumferential surface of the tool holder shaft, and N fixed components are provided, 2≤N≤4, the N fixed components are arranged at intervals along the circumference of the tool holder shaft, and the phase angle of any two adjacent fixed components in the circumferential direction of the tool holder shaft is greater than or equal to 90°, the scraper is detachably fixedly mounted on the fixed component, the scraper is provided, and is respectively mounted on the M fixed components, M≤N, and the driving mechanism is connected to the tool holder shaft and can drive the tool holder shaft to rotate.

[0007] Furthermore, it also includes two end support mechanisms, which are respectively arranged at both ends of the tool holder shaft. The end support mechanism includes an end cover and a bearing. A bearing hole is opened on the end cover. The bearing is mounted on the tool holder shaft, and the bearing is located in the bearing hole of the end cover.

[0008] Furthermore, a sealing assembly is provided on the end support mechanism, and the sealing assembly includes a first seal, a second seal, a sealing baffle, a sealing ring and a sealing cover. The first seal, the second seal and the sealing baffle are all mounted on the tool holder shaft. The first seal is arranged between the tool holder shaft and the end cover. The sealing baffle is arranged at an end of the bearing away from the first seal, and a sealing ring is arranged between the outer peripheral surface of the sealing baffle and the end cover. The second seal is arranged at an end of the sealing baffle away from the first seal. The sealing cover is connected to the end of the tool holder shaft and pressed on the second seal, and can press the sealing baffle on the inner ring of the bearing.

[0009] Furthermore, the sealing cover is threadedly connected to the tool holder shaft.

[0010] Furthermore, the first sealing member, the second sealing member and the sealing ring are all made of rubber.

[0011] Furthermore, it also includes a scraper box body, which is provided with a accommodating cavity, and the bottom of the accommodating cavity is open, the scraper replacement mechanism is located in the accommodating cavity, the scraper box body also includes an openable maintenance cover located on one side of the accommodating cavity, and the scraper box body is also provided with a powder channel, the powder channel runs from the upper side of the scraper box body to the lower side, and the powder channel is located on the side of the accommodating cavity away from the maintenance cover.

[0012] As described above, the spare scraper replacement device for a 3D printer involved in the utility model has the following beneficial effects:

[0013] By setting up a scraper replacement mechanism and a driving mechanism, when the scraper is damaged or severely worn, the scraper can be automatically replaced without stopping the machine, and the thickness of the metal powder spread by the two scrapers before and after replacement can be ensured to be consistent, thereby extending the non-stop printing time of the 3D printer, greatly saving manpower and material resources, and improving the processing efficiency of the 3D printer. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the spare scraper replacement device in the utility model.

[0015] Figure 2 It is a structural schematic diagram of the scraper box body and the scraper replacement mechanism in the utility model.

[0016] Figure 3 It is a structural schematic diagram of the sealing component in the utility model.

[0017] Figure 4 It is a structural schematic diagram of the driving mechanism and the scraper replacement mechanism in the utility model.

[0018] Figure 5 It is a cross-sectional view of the side of the scraper box body and the scraper replacement mechanism in the utility model.

[0019] Description of Figure Numbers

[0020] 1. Scraper replacement mechanism, 101. Blade holder shaft, 102. Fixing assembly, 103. Scraper, 2. Driving mechanism, 3. Scraper box body, 301. Maintenance cover, 302. Powder channel, 4. End support mechanism, 401. End cover, 402. Bearing, 5. Sealing mechanism, 501. First sealing member, 502. Second sealing member, 503. Sealing baffle, 504. Sealing ring, 505. Sealing cover, a. Mounting plane, b. Contact plane. DETAILED DESCRIPTION

[0021] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0022] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0023] See also Figures 1 to 5 The utility model provides a spare scraper replacement device for a 3D printer, comprising a scraper replacement mechanism 1 and a driving mechanism 2. The scraper replacement mechanism 1 comprises a tool holder shaft 101, a fixing component 102 and a scraper 103. The fixing component 102 is fixedly mounted on the outer circumferential surface of the tool holder shaft 101, and the fixing components 102 are provided with N, 2≤N≤4, the N fixing components 102 are arranged at intervals along the circumference of the tool holder shaft 101, and the phase angle of any two adjacent fixing components 102 in the circumferential direction of the tool holder shaft 101 is greater than or equal to 90°, wherein the phase angle is the central angle formed by the connecting line between the centers of the two fixing components 102 and the axis center of the tool holder shaft 101. The N fixed components 102 are preferably evenly arranged along the circumference of the tool holder shaft 101. When N=2, the phase angle between any two adjacent fixed components 102 in the circumferential direction of the tool holder shaft 101 is equal to 180°. When N=3, the phase angle between any two adjacent fixed components 102 in the circumferential direction of the tool holder shaft 101 is equal to 120°. When N=4, the phase angle between any two adjacent fixed components 102 in the circumferential direction of the tool holder shaft 101 is equal to 90°. The scraper 103 is detachably fixedly mounted on the fixed component 102. There are M scrapers 103, and they are respectively mounted on the M fixed components 102, M≤N. The driving mechanism 2 is connected to the tool holder shaft 101, such as a key connection, and can drive the tool holder shaft 101 to rotate.

[0024] The basic working principle of the spare scraper replacement device of the 3D printer involved in the utility model is as follows: when the scraper 103 is damaged or severely worn, the driving mechanism 2 drives the tool holder shaft 101 to rotate, so that the damaged or severely worn scraper 103 is away from the printing area, and the spare scraper 103 is rotated to the printing area, thereby automatically completing the replacement of the scraper 103 without stopping the machine; at the same time, by arranging the tool holder shaft 101, the fixing component 102 and the scraper 103, the installation plane a of the fixing component 102 and the tool holder shaft 101 at the installation joint can be parallel to the scraper The parallelism error values ​​of the contact plane b at the contact point between the blade 103 and the metal powder, and the mounting plane a and the contact plane b are within 0.03 mm, and the distances between all mounting planes a and the corresponding contact planes b can be made equal, thereby ensuring that the contact points between all scrapers 103 and the metal powder are located on the circumference of the same circle, and the circle takes the axis of the tool holder shaft 101 as the center, thereby ensuring that the thickness of the metal powder spread by all scrapers 103 on the tool holder shaft 101 is the same, thereby eliminating the need for additional leveling of the scraper 103 after replacing the scraper 103.

[0025] See also Figures 1 to 5 The present invention is further described below with a specific embodiment:

[0026] In this embodiment, see Figure 1 and Figure 3 As a preferred design, it also includes two end support mechanisms 4, which are respectively arranged at both ends of the tool holder shaft 101. The end support mechanism 4 includes an end cover 401 and a bearing 402. A bearing hole is opened on the end cover 401. The bearing 402 is mounted on the tool holder shaft 101, and the bearing 402 is located in the bearing hole of the end cover 401. The bearing 402 preferably adopts a dustproof bearing. The end support mechanism 4 can support the scraper replacement mechanism 1 and the driving mechanism 2, and can prevent metal powder from flying to the outside of the spare scraper replacement device.

[0027] In this embodiment, see Figure 2 and Figure 3As a preferred design, a sealing assembly 5 is provided on the end support mechanism 4, and the sealing assembly 5 includes a first sealing member 501, a second sealing member 502, a sealing baffle 503, a sealing ring 504 and a sealing cover 505. The first sealing member 501, the second sealing member 502 and the sealing baffle 503 are all mounted on the tool holder shaft 101, and the first sealing member 501 is arranged between the tool holder shaft 101 and the end cover 401. The tool holder shaft 101 presses the first sealing member 501 against the end surface of the end cover 401. The first sealing member 501 can prevent metal powder from entering the bearing 402 from the gap between the bearing hole of the end cover 401 and the tool holder shaft 101, and protects the bearing 402 from the inside of the spare scraper replacement device; the sealing baffle 503 is arranged at one end of the bearing 402 away from the first sealing member 501, and the outer periphery of the sealing baffle 503 A sealing ring 504 is provided between the surface and the end cover 401, and the second sealing member 502 is provided at one end of the sealing baffle 503 away from the first sealing member 501. The sealing cover 505 is connected to the end of the tool holder shaft 101 and is pressed against the second sealing member 502, and can press the sealing baffle 503 against the inner ring of the bearing 402, thereby fixing the position of the bearing 402. By providing the second sealing member 502, it is possible to prevent metal powder from entering the bearing 402 through the gap between the through hole of the sealing baffle 503 and the tool holder shaft 101. By providing the sealing ring 504, it is possible to prevent metal powder from entering the bearing 402 through the gap between the bearing hole and the sealing baffle 503. The bearing 402 is protected from the outside of the spare scraper replacement device. The sealing assembly 5 protects the bearing 402 from both the inside and the outside, which can greatly improve the dustproof effect.

[0028] In this embodiment, see Figure 3 As a preferred design, both ends of the tool holder shaft 101 are provided with external threads, and the sealing cover 505 is threadedly connected to the tool holder shaft 101, which has a simple structure, reliable connection and convenient disassembly and assembly.

[0029] In this embodiment, see Figure 3 and Figure 4 As a preferred design, the first seal 501, the second seal 502 and the sealing ring 504 are all made of rubber, which has good elasticity and is easy to bond with other materials. When the first seal, the second seal and the sealing ring are pressed, elastic deformation and plastic deformation will occur, which can fill the gaps and unevenness of the contact surface and further improve the dustproof effect.

[0030] In this embodiment, see Figure 1 and Figure 5As a preferred design, it also includes a scraper box body 3, which can provide support for the end support mechanism 4. A accommodating chamber is provided in the scraper box body 3, and the bottom of the accommodating chamber is open. The scraper replacement mechanism 1 is located in the accommodating chamber. The scraper box body 3 also includes an openable maintenance cover 301 located at the rear side of the accommodating chamber. The maintenance cover 301 can play a certain protective role for the scraper replacement mechanism 1, and can also prevent metal powder from flying to the outside of the spare scraper replacement device. When the scraper replacement mechanism 1 needs to be replaced, removing the maintenance cover 301 can facilitate the staff to carry out the replacement work. A powder channel 302 is also provided in the scraper box body 3. The powder channel 302 runs through the upper side of the scraper box body 3 to the lower side, and the powder channel 302 is located at the front side of the accommodating chamber away from the maintenance cover 301. The powder storage unit transports a certain amount of metal powder to the printing area of ​​the scraper 103 through the powder channel 302, and the metal powder is located in front of the scraper 103, that is, the direction in which the scraper 103 pushes the metal powder when performing the powder spreading action.

[0031] In this embodiment, see Figure 1 and Figure 5 As a preferred design, the fixing assembly 102 includes a first clamping block and a second clamping block. The first clamping block is fixed on the tool holder shaft 101, and the second clamping block is installed on the first clamping block. The two can be closed or separated. The first clamping block and the second clamping block can clamp and fix the scraper 103, which is convenient for installation.

[0032] As described above, the spare scraper replacement device for a 3D printer involved in the utility model has the following beneficial effects:

[0033] By setting up the scraper replacement mechanism 1 and the driving mechanism 2, when the scraper 103 is damaged or severely worn, the scraper 103 can be automatically replaced without stopping the machine, and the thickness of the metal powder spread by the two scrapers 103 before and after the replacement can be ensured to be consistent, thereby extending the non-stop printing time of the 3D printer, greatly saving manpower and material resources, and improving the processing efficiency of the 3D printer.

[0034] In summary, the utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0035] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A spare scraper replacement device for a 3D printer, characterized in that: The invention comprises a scraper replacement mechanism (1) and a driving mechanism (2). The scraper replacement mechanism (1) comprises a tool holder shaft (101), a fixing assembly (102) and a scraper (103). The fixing assembly (102) is fixedly mounted on the outer circumferential surface of the tool holder shaft (101), and N fixing assemblies (102) are provided, 2≤N≤4. The N fixing assemblies (102) are arranged at intervals along the circumference of the tool holder shaft (101), and the phase angle between any two adjacent fixing assemblies (102) in the circumferential direction of the tool holder shaft (101) is greater than or equal to 90°. The scraper (103) is detachably fixedly mounted on the fixing assembly (102), and M scrapers (103) are provided and respectively mounted on M fixing assemblies (102), M≤N. The driving mechanism (2) is connected to the tool holder shaft (101) and can drive the tool holder shaft (101) to rotate.

2. The spare scraper replacement device for a 3D printer according to claim 1, characterized in that: The tool holder also comprises two end support mechanisms (4), the two end support mechanisms (4) being respectively arranged at two ends of the tool holder shaft (101), the end support mechanism (4) comprising an end cover (401) and a bearing (402), the end cover (401) being provided with a bearing hole, the bearing (402) being sleeved on the tool holder shaft (101), and the bearing (402) being located in the bearing hole of the end cover (401).

3. The spare scraper replacement device for a 3D printer according to claim 2, characterized in that: The end support mechanism (4) is provided with a sealing assembly (5), the sealing assembly (5) comprising a first sealing member (501), a second sealing member (502), a sealing baffle (503), a sealing ring (504) and a sealing cover (505), the first sealing member (501), the second sealing member (502) and the sealing baffle (503) are all sleeved on the tool holder shaft (101), the first sealing member (501) is arranged between the tool holder shaft (101) and the end cover (401), the sealing baffle (503) is arranged between the tool holder shaft (101) and the end cover (401), and the sealing baffle (504) is arranged between the tool holder shaft (101) and the end cover (401). 03) is arranged at one end of the bearing (402) away from the first sealing member (501), and a sealing ring (504) is provided between the outer peripheral surface of the sealing baffle (503) and the end cover (401), the second sealing member (502) is arranged at one end of the sealing baffle (503) away from the first sealing member (501), the sealing cover (505) is connected to the end of the tool holder shaft (101) and is pressed on the second sealing member (502), and can make the sealing baffle (503) pressed on the inner ring of the bearing (402).

4. The spare scraper replacement device for a 3D printer according to claim 3, characterized in that: The sealing cover (505) is threadedly connected to the tool holder shaft (101).

5. The spare scraper replacement device for a 3D printer according to claim 3, characterized in that: The first sealing member (501), the second sealing member (502) and the sealing ring (504) are all made of rubber.

6. The spare scraper replacement device for a 3D printer according to claim 3, characterized in that: The scraper box (3) further comprises a scraper box body (3), wherein a receiving cavity is provided in the scraper box body (3), and the bottom of the receiving cavity is open, wherein the scraper replacement mechanism (1) is located in the receiving cavity, wherein the scraper box body (3) further comprises an openable maintenance cover (301) located at one side of the receiving cavity, wherein a powder channel (302) is provided in the scraper box body (3), wherein the powder channel (302) extends from the upper side surface of the scraper box body (3) to the lower side surface, and wherein the powder channel (302) is located at a side of the receiving cavity away from the maintenance cover (301).

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