3D printing equipment bidirectional powder scraper device

Abstract

The present invention belongs to the field of 3D printing, and provides a bidirectional powder spreading scraper device for 3D printing equipment, which comprises a powder spreading scraper device and an automatic material dropping device. Through a collision shaft reversing component, a plane baffle component and a reversing block, the rear powder chamber is kept sealed during the powder spreading process on the front side of the device, and the powder is dropped in the opposite direction at the extreme position of the powder spreading movement. A single set of scrapers is used to achieve bidirectional powder spreading, and the powder spreading efficiency is high. There is no inconsistency in height between the two sets of scrapers and bending and deformation of the plane baffle. The blade is adjusted in two ways through the blade adjustment component, and the scraper height can be directly adjusted on the printing plane, and the blade adjustment component can be disassembled and replaced as a whole, thereby improving the convenience of blade adjustment. The scraper is at the bottom of the device, and powder is not easily blown during the powder spreading process. The automatic material dropping device is used to achieve automatic quantitative and constant speed material dropping. In cooperation with the front powder chamber and the rear powder chamber, the single material dropping amount meets the bidirectional powder spreading demand, and the powder for single powder spreading is stored separately.

Description

Technical Field

[0001] The invention relates to the field of 3D printing, and in particular to a bidirectional powder spreading scraper device for 3D printing equipment. Background Art

[0002] SLM (Selective Laser Melting), also known as powder-laying 3D printing technology, is one of the main manufacturing technologies for 3D printing. This technology uses laser as energy to scan the flat metal powder in layers along the path trajectory planned in the 3D model view to melt and connect and solidify it, thereby achieving metallurgical welding and quickly obtaining high-density and high-strength metal components corresponding to the 3D model.

[0003] Powder spreading is an important part of SLM, which affects the printing accuracy and processing efficiency. At present, the powder spreading technology of SLM on the market can be divided into two types, namely unidirectional powder spreading and bidirectional powder spreading. After the unidirectional powder spreading device receives the material at the material outlet, it first performs a unidirectional powder spreading action, and then the powder spreading device needs to return to the material outlet to re-receive the material, and its return motion is an empty stroke. The structure of the unidirectional powder spreading device is relatively simple and stable, and only requires a set of fixed powder spreading scrapers, but its single powder spreading time is long and the efficiency is low. The bidirectional powder spreading device usually uses two sets of powder spreading scrapers, which are installed on both sides of the device respectively, and a single powder chamber separated by an adjustable baffle is in the middle of the device. The double-knife bidirectional powder spreading device can spread powder twice in one reciprocating motion, and the powder spreading efficiency is high, but the height consistency of the two scrapers of the double-knife bidirectional powder spreading device is poor, and the knife adjustment is cumbersome. Therefore, it is necessary to propose a bidirectional powder spreading scraper device for 3D printing equipment to achieve bidirectional powder spreading through a single set of scrapers. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a bidirectional powder spreading scraper device for 3D printing equipment. Through the impact shaft reversing component and the plane baffle component, the rear powder chamber is kept sealed during the powder spreading process on the front side of the device, and the reversing powder dropping is achieved at the extreme position of the powder spreading movement. The bidirectional powder spreading is achieved in conjunction with a single set of scrapers. The scraper height can be directly adjusted on the printing plane through the knife adjusting component, and the knife adjusting component can be disassembled and replaced as a whole to improve the printing continuity. Automatic unloading is achieved through the automatic unloading device. In conjunction with the front powder chamber and the rear powder chamber, the single unloading amount meets the bidirectional powder spreading demand, and the powder of a single powder spreading is stored separately.

[0005] The present invention provides a bidirectional powder spreading scraper device for 3D printing equipment, which comprises a powder spreading scraper device and an automatic material dropping device.

[0006] The powder spreading scraper device comprises a scraper frame, a front baffle, a blade adjustment assembly, a collision shaft reversing assembly and a plane baffle assembly;

[0007] The front baffle is arranged at the front end of the scraper frame, and first grooves are arranged on both sides of the front end of the scraper frame, and both sides of the inner side surface of the front baffle are connected to the end surfaces of the first grooves on both sides of the scraper frame;

[0008] The blade adjusting assembly is arranged in the middle of the scraper frame, and the blade adjusting assembly includes a blade adjusting bracket, a scraper, an adjustment spring and a scraper pressing plate. Second grooves are arranged on both sides of the middle of the top of the scraper frame, and protrusions on both sides of the top of the blade adjusting bracket are connected to the scraper frame, and the protrusions are arranged in the second grooves of the scraper frame. Two steps are arranged at the bottom of the blade adjusting bracket, and the scraper is arranged at the center of the bottom of the blade adjusting bracket. The first end face of the scraper is connected to the first step side end face of the blade adjusting bracket, and the top of the scraper is connected to the first step top end face of the blade adjusting bracket through the adjustment spring, and the inner side surface of the scraper pressing plate is respectively connected to the second step side end face of the blade adjusting bracket and the second end face of the scraper;

[0009] The impact shaft reversing assembly is arranged on both sides of the scraper frame, and the impact shaft reversing assembly includes a copper sleeve, a striker shaft, a fixed seat, a dust ring and a connecting plate. Stepped through holes penetrating the front and rear bosses are symmetrically arranged on both sides of the bottom of the scraper frame. The copper sleeve is arranged in the through hole of the scraper frame, and the outer ring surface of the copper sleeve is connected to the scraper frame. The impact shaft is arranged in the through hole of the copper sleeve, and the cylindrical end surface of the impact shaft is slidably connected to the inner ring surface of the copper sleeve. The fixed seat is arranged in the through hole of the scraper frame, and the fixed seat is sleeved on the impact shaft. The bottom surface of the fixed seat is connected to the side surface of the copper sleeve, and the inner side surface of the outer edge boss of the fixed seat is connected to the side surface of the front and rear bosses of the scraper frame. The dust ring is arranged in the inner groove of the fixed seat, and an annular groove is arranged in the middle and rear of the impact shaft. The front and rear bosses of the connecting plate are provided with coaxial through holes, and the through holes of the connecting plate boss are connected to the impact shaft groove;

[0010] The plane baffle assembly is arranged at the rear side of the bottom of the scraper frame, and the plane baffle assembly includes a plane baffle, a sealing felt, a felt baffle and a U-shaped connecting piece. The lower end surface of the plane baffle is connected to the connecting plate on both sides, and the upper end surface of the plane baffle is slidably connected to the rear end bottom end surface of the scraper frame. The rear end bottom of the scraper frame is provided with a third groove, and the sealing felt is arranged in the third groove of the scraper frame. The bottom surface of the sealing felt is slidably connected to the upper end surface of the plane baffle, and the top surface of the sealing felt is connected to the scraper frame through the felt baffle. The upper boss of the U-shaped connecting piece is connected to the rear end surface of the scraper frame, and the lower boss of the U-shaped connecting piece is slidably connected to the lower end surface of the plane baffle;

[0011] The automatic blanking device is arranged above the scraper frame at the blanking position, and the automatic blanking device includes a powder material box, a material box cover, a blanking upper cover, a blanking lower cover, a blanking roller and a motor. The material box cover is arranged on the top of the powder material box, the top end surface of the blanking upper cover is connected to the bottom end surface of the powder material box, the top end surface of the blanking lower cover is connected to the bottom end surface of the blanking upper cover, the blanking roller is arranged between the blanking upper cover and the blanking lower cover, and the blanking roller is connected to the output shaft of the motor through a synchronous belt.

[0012] Preferably, the inner side surface of the front baffle, the inner end surface of the scraper frame and the front end surface of the blade adjusting bracket form a front powder chamber, and a strip-shaped through groove is provided at the rear of the scraper frame to form a rear powder chamber, and the front powder chamber and the rear powder chamber are separated from each other.

[0013] Preferably, the cross section of the knife adjusting support is T-shaped.

[0014] Preferably, the first end face and the second end face of the scraper are provided with a plurality of strip-shaped protrusions, the first step side end face of the blade adjustment bracket and the inner side face of the scraper pressure plate are provided with strip-shaped grooves, and the strip-shaped protrusions are arranged in the strip-shaped grooves.

[0015] Preferably, the central through hole of the fixing seat coincides with the central axis of the impact shaft, fixing screw holes are arranged at the four corners of the fixing seat, and the fixing seat is symmetrically arranged on both sides of the copper sleeve.

[0016] Preferably, a notch connected to the boss through hole is provided on the inner side of the boss of the connecting plate, and coaxial through holes are provided on the outer side of the boss of the connecting plate and the impact shaft groove, and the coaxial through holes are connected by cylindrical pins.

[0017] Preferably, the front boss of the connecting plate is arranged between the front and rear bosses at the bottom of the scraper frame, and the rear boss of the connecting plate is arranged outside the rear boss of the scraper frame.

[0018] Preferably, reversing blocks are provided on the forward and backward movement paths of the impact shaft.

[0019] Preferably, the upper blanking cover is provided with a first blanking channel, the lower blanking cover is provided with a second blanking channel, the powder material box, the first blanking channel, the blanking roller and the second blanking channel are interconnected; the blanking roller is evenly provided with arc-shaped blanking grooves along the circumferential direction.

[0020] Preferably, the bottom opening of the second blanking channel of the blanking lower cover at the blanking position is connected to the front powder chamber and the rear powder chamber, a circular feeding port is provided at the top center of the material box cover, and handles are symmetrically provided at both ends of the top of the material box cover.

[0021] The characteristics and beneficial effects of the present invention are:

[0022] 1. The bidirectional powder spreading scraper device of the 3D printing equipment of the present invention realizes that the rear powder chamber remains sealed during the powder spreading process on the front side of the device through the impact shaft reversing component and the flat baffle component, and realizes reversal and powder dropping at the extreme position of the front side powder spreading movement, and cooperates with a single set of scrapers to realize bidirectional powder spreading, with high powder spreading efficiency and no problem of inconsistent heights of the two sets of scrapers.

[0023] 2. The bidirectional powder spreading scraper device of the 3D printing equipment of the present invention uses the reversing block to hit the center of the impact shaft, and the impact shaft drives the connecting plate to realize the movement of the plane baffle. The plane baffle is not directly subjected to force and is not easy to deform and fail, thereby improving the sealing reliability of the powder chamber behind the device.

[0024] 3. The bidirectional powder spreading scraper device of the 3D printing equipment of the present invention realizes dual-mode blade adjustment through the blade adjusting assembly. The scraper height can be directly adjusted on the printing plane, and the blade adjusting assembly can be disassembled and replaced as a whole, thereby improving the convenience of blade adjustment and printing continuity. The scraper is arranged at the bottom of the blade adjusting assembly, and the blade body height is low, which is not easy to cause powder flying during the powder spreading process.

[0025] 4. The bidirectional powder spreading scraper device of the 3D printing equipment of the present invention realizes automatic quantitative and constant speed material discharging through an automatic material dropping device. In conjunction with the front powder chamber and the rear powder chamber, the single material discharging amount meets the bidirectional powder spreading demand, and the powder for a single powder spreading is stored separately. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of a powder spreading scraper device of a bidirectional powder spreading scraper device of a 3D printing device of the present invention;

[0027] Figure 2 It is a bottom schematic diagram of a powder spreading scraper device of a bidirectional powder spreading scraper device of a 3D printing device of the present invention;

[0028] Figure 3 It is a bottom view of a powder spreading scraper device of a bidirectional powder spreading scraper device of a 3D printing device of the present invention;

[0029] Figure 4 It is a structural cross-sectional view of the impact shaft reversing assembly of the present invention;

[0030] Figure 5 It is a structural cross-sectional view of the knife adjustment assembly and the plane baffle assembly in the present invention;

[0031] Figure 6 It is a structural schematic diagram of the automatic blanking device in the present invention;

[0032] Figure 7 It is a structural cross-sectional view of the automatic blanking device in the present invention;

[0033] Figure 8 It is a structural sectional view of the blanking roller in the present invention.

[0034] Main reference numerals:

[0035] 1. Scraper holder; 2. Front baffle; 3. Adjusting knife assembly; 31. Adjusting knife bracket; 32. Scraper; 33. Adjusting spring; 34. Scraper pressure plate; 4. Impact shaft reversing assembly; 41. Copper sleeve; 42. Impact shaft; 43. Fixed seat; 44. Dust ring; 45. Connecting plate; 5. Plane baffle assembly; 51. Plane baffle; 52. Sealing felt; 53. Felt baffle; 54. U-shaped connector; 6. Front powder chamber; 7. Rear powder chamber; 8. Powder material box; 9. Material box cover; 91. Feeding port; 92. Handle; 10. Blanking upper cover; 101. First blanking channel; 11. Blanking lower cover; 111. Second blanking channel; 12. Blanking roller; 121. Blanking groove; 13. Motor. DETAILED DESCRIPTION

[0036] In order to fully describe the technical content, structural features, objectives and effects of the present invention, the following will be described in detail with reference to the accompanying drawings.

[0037] The bidirectional powder spreading scraper device of the 3D printing equipment of the present invention comprises a powder spreading scraper device and an automatic material dropping device.

[0038] like Figure 1 and Figure 2 As shown, the powder spreading scraper device includes a scraper frame 1, a front baffle plate 2, a blade adjusting assembly 3, a collision shaft reversing assembly 4 and a plane baffle assembly 5.

[0039] The front baffle plate 2 is arranged at the front end of the scraper frame 1 . First grooves are arranged on both sides of the front end of the scraper frame 1 . Both sides of the inner side surface of the front baffle plate 2 are connected to the end surfaces of the first grooves on both sides of the scraper frame 1 .

[0040] like Figure 1 and Figure 5As shown, the blade adjustment component 3 is arranged in the middle of the scraper frame 1, and the blade adjustment component 3 includes a blade adjustment bracket 31, a scraper 32, an adjustment spring 33 and a scraper pressure plate 34. The cross section of the blade adjustment bracket 31 is T-shaped, and second grooves are arranged on both sides of the middle of the top of the scraper frame 1. The protrusions on both sides of the top of the blade adjustment bracket 31 are connected to the scraper frame 1 and are arranged in the second groove of the scraper frame 1. The bottom of the blade adjustment bracket 31 is provided with two steps, and the scraper 32 is arranged in the bottom center of the blade adjustment bracket 31. The first end face of the scraper 32 is connected to the first step side end face of the blade adjustment bracket 31. The top of the scraper 32 is connected to the first step top end face of the blade adjustment bracket 31 through the adjustment spring 33. The adjustment spring 33 provides a diameter for the scraper 32 The scraper 32 is pressed downward to prevent the scraper 32 from vibrating up and down. The inner side surface of the scraper pressing plate 34 is respectively connected to the second step side end surface of the blade adjusting bracket 31 and the second end surface of the scraper 32. The first end surface and the second end surface of the scraper 32 are provided with several strip protrusions. The first step side end surface of the blade adjusting bracket 31 and the inner side surface of the scraper pressing plate 34 are provided with strip grooves. The strip protrusions are arranged in the strip grooves. The positional relationship between the strip protrusions and the strip grooves determines the height position of the scraper 32. The inner side surface of the front side baffle 2, the inner end surface of the scraper holder 1 and the front end surface of the blade adjusting bracket 31 constitute the front powder chamber 6. The rear part of the scraper holder 1 is provided with a strip through groove to form a rear powder chamber 7. The front and rear powder chambers are isolated from each other, and the powder for a single powder spreading is stored separately.

[0041] like Figures 1 to 4As shown, the impact shaft reversing assembly 4 is arranged on both sides of the scraper frame 1, which includes a copper sleeve 41, a striker shaft 42, a fixed seat 43, a dust ring 44 and a connecting plate 45. The bottom two sides of the scraper frame 1 are symmetrically provided with stepped through holes running through the front and rear bosses. The copper sleeve 41 is arranged in the through hole of the scraper frame, and the outer ring surface of the copper sleeve 41 is connected to the scraper frame 1. The striker shaft 42 is arranged in the through hole of the copper sleeve 41, and the cylindrical end surface of the striker shaft 42 is slidably connected to the inner ring surface of the copper sleeve 41. Reversing blocks are arranged at the extreme positions of the forward and backward movement path of the striker shaft 42, and reversing powder falling is achieved by impacting the striker shaft 42 by the reversing blocks. The fixed seat 43 is arranged in the through hole of the scraper frame 1 and is sleeved on the striker shaft 42. The central through hole of the fixed seat 43 coincides with the central axis of the striker shaft 42, and the bottom surface of the fixed seat 43 is connected to the side of the copper sleeve 41. The fixed seat 43 is symmetrically arranged on both sides of the copper sleeve 41. The inner side surface of the outer edge boss of the fixed seat 43 is connected to the scraper The sides of the front and rear bosses of the frame 1 are connected, and fixing screw holes are provided at the four corners of the fixing seat 43. The dust ring 44 is arranged in the internal groove of the fixing seat 43 to prevent powder from entering and reduce the wear of the impact shaft 42. The middle and rear parts of the impact shaft 42 are provided with annular grooves, and the front and rear bosses of the connecting plate 45 are provided with coaxial through holes. The boss through holes of the connecting plate 45 are connected to the annular grooves of the impact shaft 42. The front boss of the connecting plate 45 is arranged between the front and rear bosses of the bottom of the scraper frame 1 to limit the moving distance of the connecting plate 45. The rear boss of the connecting plate 45 is arranged on the outer side of the rear boss of the scraper frame 1, and a notch connecting the boss through hole is arranged on the inner side of the boss of the connecting plate 45 to facilitate the assembly between the connecting plate 45 and the impact shaft 42. The outer side of the boss of the connecting plate 45 and the groove of the impact shaft 42 are provided with coaxial through holes, and the coaxial through holes are connected by cylindrical pins to limit the rotation of the impact shaft 42. The connecting plate 45 is provided with a strip grid.

[0042] like Figure 2 , Figure 3 and Figure 5 As shown, the plane baffle assembly 5 is arranged at the bottom rear side of the scraper frame 1, which includes a plane baffle 51, a sealing felt 52, a felt baffle 53 and a U-shaped connecting piece 54. The lower end surface of the plane baffle 51 is connected to the upper end surface of the connecting plate 45 on both sides, and the upper end surface of the plane baffle 51 is slidably connected to the rear end bottom end surface of the scraper frame 1. In the process of the two-way powder spreading scraper device spreading powder forward, the plane baffle 51 plays a role in closing the leakage at the lower end of the rear powder chamber 7. The rear end bottom of the scraper frame 1 is provided with a third groove, and the sealing felt 52 is provided with a third groove. 52 is arranged in the third groove of the scraper frame, the bottom surface of the sealing felt 52 is slidably connected to the upper end surface of the plane baffle 51, and the top surface of the sealing felt 52 is connected to the scraper frame 1 through the felt baffle 53. The sealing felt 52 can play a role in cleaning the residual powder on the plane baffle when the powder is reversed at the forward limit position, and push the powder to the printing plane. The front end surface of the upper boss of the U-shaped connecting piece 54 is connected to the rear end surface of the scraper frame 1, and the upper end surface of the lower boss of the U-shaped connecting piece 54 is slidably connected to the lower end surface of the plane baffle 51.

[0043] like Figure 6 , Figure 7 and Figure 8 As shown, the automatic blanking device includes a powder material box 8, a material box cover plate 9, a blanking upper cover 10, a blanking lower cover 11, a blanking roller 12 and a motor 13. The material box cover plate 9 is arranged on the top of the powder material box 8, the top end surface of the blanking upper cover 10 is connected to the bottom end surface of the powder material box 8, the top end surface of the blanking lower cover 11 is connected to the bottom end surface of the blanking upper cover 10, the blanking roller 12 is arranged between the blanking upper cover 10 and the blanking lower cover 11, and the blanking roller 12 is connected to the output shaft of the motor 13 through a synchronous belt. 0 is provided with a first blanking channel 101, the blanking lower cover 11 is provided with a second blanking channel 111, a circular feeding port 91 is provided at the top center of the material box cover plate 9, and handles 92 are symmetrically provided at both ends of the top of the material box cover plate 9. The powder material box 8, the first blanking channel 101, the blanking roller 12 and the second blanking channel 111 are connected to each other, and the blanking roller 12 is evenly provided with arc-shaped blanking grooves 121 along the circumferential direction. The bottom opening of the second blanking channel 111 at the blanking position is connected with the front powder chamber 6 and the rear powder chamber 7.

[0044] The following is a further description of a bidirectional powder spreading scraper device for 3D printing equipment of the present invention in combination with an embodiment. The use process of the bidirectional powder spreading scraper device for 3D printing equipment of the present invention is as follows:

[0045] First, the unloading position is set at the rear limit moving position of the powder scraper device, and the automatic unloading device is set above the unloading position. The powder scraper device moves to this position for the first unloading, and metal powder is added to the powder material box 8 through the feeding port 91. Under the action of gravity, the metal powder passes through the first unloading channel 101 and is stored in the unloading groove 121. The motor 13 drives the unloading roller 12 to rotate through the synchronous belt transmission, and the powder in the unloading groove 121 enters the front powder chamber 6 and the rear powder chamber 7 through the second unloading channel 111. The output angle and speed of the motor 13 are adjusted to realize quantitative control of the unloading amount and unloading speed. The powder in the front powder chamber 6 falls directly on the printing platform of the powder scraper device, and the leakage at the lower end of the rear powder chamber 7 is closed by the flat baffle 51, and the powder in the rear powder chamber 7 falls on the flat baffle 51.

[0046] After the material is unloaded, the powder-spreading scraper device moves forward with the moving module, and its bottom scraper 32 evenly spreads the powder in the front powder chamber 6 on the printing plane. When it reaches the forward movement limit position, the reversing block hits the impact shaft 42, and the impact shaft 42 drives the connecting plate 45 to move backward, thereby realizing the backward translation of the plane baffle 51, opening the leakage at the lower end of the rear powder chamber 7, and the powder in the rear powder chamber 7 begins to fall on the printing platform, realizing the reversal of powder dropping. Then the powder-spreading scraper device moves backward, and the scraper 32 evenly spreads the powder in the rear powder chamber 7 on the printing plane. When it reaches the forward movement limit position, the reversing block hits the impact shaft 42 again, and the impact shaft 42 drives the connecting plate 45 to move forward, thereby realizing the forward translation of the plane baffle 51, re-closing the leakage at the lower end of the rear powder chamber 7, and the two-way scraper powder-spreading device receives the material for the next time.

[0047] The height of the scraper 32 of the powder spreading scraper device can be adjusted in two ways. The first way is to move the bidirectional powder spreading scraper device to the front side, remove the front side baffle 2 and the scraper pressure plate 34, and then adjust the height of the scraper 32 directly on the printing plane, and place the strip protrusion of the scraper 32 in the corresponding strip groove of the blade adjustment bracket 31 and the scraper pressure plate 34; the second way is to take out the blade adjustment assembly 3 as a whole from the upper part of the bidirectional powder spreading scraper device, place it on the external blade adjustment tooling for blade adjustment, and install a new blade adjustment assembly 3.

[0048] The embodiments described above are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A two-way powder spreading scraper device for 3D printing equipment, characterized in that: It includes a powder spreading scraper device and an automatic material dropping device. The powder spreading scraper device comprises a scraper frame, a front baffle, a blade adjustment assembly, a collision shaft reversing assembly and a plane baffle assembly; The front baffle is arranged at the front end of the scraper frame, and first grooves are arranged on both sides of the front end of the scraper frame, and both sides of the inner side surface of the front baffle are connected to the end surfaces of the first grooves on both sides of the scraper frame; The blade adjusting assembly is arranged in the middle of the scraper frame, and the blade adjusting assembly includes a blade adjusting bracket, a scraper, an adjustment spring and a scraper pressing plate. Second grooves are arranged on both sides of the middle of the top of the scraper frame, and protrusions on both sides of the top of the blade adjusting bracket are connected to the scraper frame, and the protrusions are arranged in the second grooves of the scraper frame. Two steps are arranged at the bottom of the blade adjusting bracket, and the scraper is arranged at the center of the bottom of the blade adjusting bracket. The first end face of the scraper is connected to the first step side end face of the blade adjusting bracket, and the top of the scraper is connected to the first step top end face of the blade adjusting bracket through the adjustment spring, and the inner side surface of the scraper pressing plate is respectively connected to the second step side end face of the blade adjusting bracket and the second end face of the scraper; The impact shaft reversing assembly is arranged on both sides of the scraper frame, and the impact shaft reversing assembly includes a copper sleeve, a striker shaft, a fixed seat, a dust ring and a connecting plate. Stepped through holes penetrating the front and rear bosses are symmetrically arranged on both sides of the bottom of the scraper frame. The copper sleeve is arranged in the through hole of the scraper frame, and the outer ring surface of the copper sleeve is connected to the scraper frame. The impact shaft is arranged in the through hole of the copper sleeve, and the cylindrical end surface of the impact shaft is slidably connected to the inner ring surface of the copper sleeve. The fixed seat is arranged in the through hole of the scraper frame, and the fixed seat is sleeved on the impact shaft. The bottom surface of the fixed seat is connected to the side surface of the copper sleeve, and the inner side surface of the outer edge boss of the fixed seat is connected to the side surface of the front and rear bosses of the scraper frame. The dust ring is arranged in the inner groove of the fixed seat, and an annular groove is arranged in the middle and rear of the impact shaft. The front and rear bosses of the connecting plate are provided with coaxial through holes, and the through holes of the connecting plate boss are connected to the impact shaft groove; The plane baffle assembly is arranged at the rear side of the bottom of the scraper frame, and the plane baffle assembly includes a plane baffle, a sealing felt, a felt baffle and a U-shaped connecting piece. The lower end surface of the plane baffle is connected to the connecting plate on both sides, and the upper end surface of the plane baffle is slidably connected to the rear end bottom end surface of the scraper frame. The rear end bottom of the scraper frame is provided with a third groove, and the sealing felt is arranged in the third groove of the scraper frame. The bottom surface of the sealing felt is slidably connected to the upper end surface of the plane baffle, and the top surface of the sealing felt is connected to the scraper frame through the felt baffle. The upper boss of the U-shaped connecting piece is connected to the rear end surface of the scraper frame, and the lower boss of the U-shaped connecting piece is slidably connected to the lower end surface of the plane baffle; The automatic blanking device is arranged above the scraper frame at the blanking position, and the automatic blanking device includes a powder material box, a material box cover, a blanking upper cover, a blanking lower cover, a blanking roller and a motor. The material box cover is arranged on the top of the powder material box, the top end surface of the blanking upper cover is connected to the bottom end surface of the powder material box, the top end surface of the blanking lower cover is connected to the bottom end surface of the blanking upper cover, the blanking roller is arranged between the blanking upper cover and the blanking lower cover, and the blanking roller is connected to the output shaft of the motor through a synchronous belt.

2. The bidirectional powder spreading scraper device for 3D printing equipment according to claim 1, characterized in that: The inner side surface of the front baffle, the inner end surface of the scraper frame and the front end surface of the blade adjusting bracket form a front powder chamber, and a strip through groove is arranged at the rear of the scraper frame to form a rear powder chamber, and the front powder chamber and the rear powder chamber are separated from each other.

3. The bidirectional powder spreading scraper device for 3D printing equipment according to claim 1, characterized in that: The cross section of the knife adjusting bracket is T-shaped.

4. The bidirectional powder spreading scraper device for 3D printing equipment according to claim 1, characterized in that: The first end face and the second end face of the scraper are provided with a plurality of strip-shaped protrusions, the first step side end face of the blade adjustment bracket and the inner side face of the scraper pressing plate are provided with strip-shaped grooves, and the strip-shaped protrusions are arranged in the strip-shaped grooves.

5. The bidirectional powder spreading scraper device for 3D printing equipment according to claim 1, characterized in that: The central through hole of the fixing seat coincides with the central axis of the impact shaft, fixing screw holes are arranged at the four corners of the fixing seat, and the fixing seat is symmetrically arranged on both sides of the copper sleeve.

6. The bidirectional powder spreading scraper device for 3D printing equipment according to claim 1, characterized in that: A notch connected to the boss through hole is arranged on the inner side of the boss of the connecting plate, and coaxial through holes are arranged on the outer side of the boss of the connecting plate and the impact shaft groove, and the coaxial through holes are connected by cylindrical pins.

7. The bidirectional powder spreading scraper device for 3D printing equipment according to claim 1, characterized in that: The front boss of the connecting plate is arranged between the front and rear bosses at the bottom of the scraper frame, and the rear boss of the connecting plate is arranged outside the rear boss of the scraper frame.

8. The bidirectional powder spreading scraper device for 3D printing equipment according to claim 1, characterized in that: Reversing blocks are arranged on the front and rear direction movement paths of the impact shaft.

9. The bidirectional powder spreading scraper device for 3D printing equipment according to claim 2, characterized in that: The upper blanking cover is provided with a first blanking channel, the lower blanking cover is provided with a second blanking channel, the powder material box, the first blanking channel, the blanking roller and the second blanking channel are interconnected; the blanking roller is evenly provided with arc-shaped blanking grooves along the circumferential direction.

10. The bidirectional powder spreading scraper device for 3D printing equipment according to claim 9, characterized in that: The bottom opening of the second blanking channel of the blanking lower cover at the blanking position is connected to the front powder chamber and the rear powder chamber. A circular feeding port is arranged at the top center of the material box cover plate, and handles are symmetrically arranged at both ends of the top of the material box cover plate.

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