A doctor blade assembly

Abstract

The application discloses a scraper assembly, which comprises a scraper base, a sliding block one, a scraper and a sliding block two. The sliding block one is slidingly matched with the scraper base. The scraper is fixedly arranged at the bottom of the scraper base and is configured to cooperate with the bottom of the sliding block one during the sliding of the sliding block one, so that the movement direction of the scraper is changed by the movement of the sliding block one. After the sliding block one contacts the resin groove wall, the sliding block one moves reversely to push the scraper to switch the direction, thereby preventing the resin from accumulating on one side of the scraper. The scraper is provided with an elastic plunger. The sliding block one and the elastic plunger are elastically and movably abutted. When the scraper is pressed under stress, the elastic plunger can eliminate the movable size allowance caused by the matching tolerance of mechanical parts, so that the up-and-down movement of the scraper during the movement of the scraper is prevented and the consistency of the scraping layer thickness during the reciprocating movement of the scraper is ensured. The scraping layer thickness of the scraper is adjusted by adjusting the fine adjustment screw.

Description

Technical Field

[0001] The invention belongs to the technical field of 3D printing, and in particular relates to a scraper assembly. Background Art

[0002] Currently, in the printing of high-viscosity ceramic materials, due to the high viscosity, poor fluidity, and low light transmittance of the ceramic printing materials themselves, the material needs to be evenly spread on the resin tank in an appropriate layer thickness (usually within 0.1mm) during the actual printing process. Controlling the material layer thickness has a significant impact on printing accuracy. The current scraper makes it difficult to ensure consistent scraping layer thickness during actual printing.

[0003] In the existing scraper structure, the lower part of the scraper is basically set in a flat surface, which will push the material liquid back to the other side during the back and forth movement, causing the material liquid to be unable to be leveled, affecting the printing effect.

[0004] Alternatively, an existing scraper structure includes a blade holder and a scraper. The scraper includes a scraper body, a connecting block, and a deflection bar. The deflection bar is provided on the outside of the scraper body, with chamfered upper and lower portions. Connecting blocks are provided at the upper ends of the scraper body along its length, and the scraper body is rotatably connected to the blade holder via the connecting blocks. The blade holder drives the scraper in a linear back-and-forth motion within the resin tank. After contacting the tank wall, the scraper tilts, and during its return motion, a certain height difference is created between the scraper and the material coating, preventing the material from being pushed back. Furthermore, if the scraper's reciprocating motion causes inconsistent impacts on the tank wall, the scraper's back-and-forth motion will result in inconsistent scraping thicknesses. Summary of the Invention

[0005] The object of the present invention is to provide a scraper assembly to solve the technical problems that the existing scrapers are difficult to spread high-viscosity ceramic materials evenly and difficult to accurately control the layer thickness.

[0006] To achieve the above purpose, the specific technical solutions of the present invention are as follows:

[0007] A scraper assembly comprising:

[0008] scraper base;

[0009] Slider 1, slidably mounted on the scraper base;

[0010] The scraper is movably arranged at the bottom of the scraper base. The scraper includes scrapers on both sides. There is a cavity for storing resin between the scrapers on both sides. When the slider hits the inner wall of the resin tank on one side, it generates thrust, pushing the scraper on the same side of the resin tank to move downward, and the scraper on the other side is lifted upward accordingly. The downward-moving scraper pushes the resin in the cavity to move; during the linear back and forth movement of the scraper assembly, when the slider touches the wall of the resin tank on the other side, it moves in the opposite direction, pushing the scrapers on both sides to switch directions, and pushing the resin in the cavity in the opposite direction.

[0011] Furthermore, a guide surface is provided at the bottom of the slider, and during the sliding of the slider, the scraper and the guide surface elastically resist each other.

[0012] Furthermore, the scraper is provided with an elastic plunger to elastically abut against the slider.

[0013] Furthermore, the slider 1 is movably abutted against a plurality of elastic plungers in its moving direction, and two ends of the elastic plungers corresponding to the bottom guide surface of the slider 1 are arranged on the scraper blade of the scraper.

[0014] Furthermore, a plurality of limiting members are symmetrically provided on the scraper base. When the scraper is working, the limiting members movably abut against the limiting members to limit the rotation angle of the scraper.

[0015] Furthermore, the limiting member includes a fine-tuning screw fixed to the scraper base, and a preload spring is sleeved on the fine-tuning screw to limit the scraper rotation angle when the scraper rotates, thereby controlling the thickness of the scraper layer.

[0016] Furthermore, it also includes a scraper frame, which is arranged on the scraper base and has an adjusting piece.

[0017] Furthermore, the adjusting member includes an adjusting block, which is fixedly arranged on the scraper frame. An adjusting rod is provided on the adjusting block, and the bottom of the adjusting rod is hinged with the scraper base.

[0018] Furthermore, a section is provided at the bottom of the adjusting rod, and a transverse through hole is provided on the section. The transverse through hole cooperates with a pin shaft to be hinged and fixed to the scraper base, thereby achieving balance adjustment of the scraper base.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] (1) The scraper body is provided with an elastic plunger, and the slider is in elastic contact with the elastic plunger. When the scraper is pressed down, the elastic plunger can eliminate the movable size margin caused by the matching tolerance of the mechanical parts, ensuring that there is no up and down movement during the scraper movement, and ensuring that the scraping thickness on both sides is consistent when the scraper moves back and forth;

[0021] (2) The scraper frame, scraper base and scraper are connected by multiple fastening screws, which facilitates the disassembly and replacement of the scraper;

[0022] (3) The slider 1 moves back and forth along the slot to ensure the horizontal stability of the slider 1 and the stability of the contact surfaces on both sides with the inner wall of the resin tank. The guide surface at the bottom of the slider 1 leaves a parallel distance of about 8 mm, which can effectively avoid the disadvantage of large deviation in the scraping thickness caused by inconsistent impact amplitude on both sides;

[0023] (4) The collision between slider 1 and the inner wall of the resin tank causes slider 1 to move in the opposite direction of the collision surface until the guide surface at the bottom of slider 1 contacts the elastic plunger of the scraper body, and the scraper is pressed down to achieve the leveling operation of the high-viscosity material in the resin tank. When slider 1 fully presses the scraper, there is an elastic gap of 0.3mm to 0.5mm between the contact surfaces of the two. When the thickness of the scraping layer is uneven, the thickness of the reciprocating scraping layer can be fine-tuned by cooperating with the fine-tuning screw, which double guarantees the consistency of the thickness of the scraping layer, that is, the adjustment and limitation of the scraping layer thickness can be achieved by the fine-tuning screw;

[0024] (5) There is a scale reading on the differential head with an accuracy of 0.01mm, which enables precise control of the scraping layer thickness;

[0025] (6) The pin shaft and the through hole of the section are hinged and fixed to realize the balance adjustment of the scraper base. Because the adjustment rod can only move up and down, when the scraper frame is horizontally leveled, the adjustment rod without transfer / freedom will not be able to move. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of the scraper assembly of the present invention;

[0027] Figure 2 is a side view of the scraper assembly of the present invention;

[0028] Figure 3 is a side sectional view of the scraper assembly of the present invention;

[0029] Figure 4 An exploded view of the scraper assembly of the present invention;

[0030] Figure 5 An exploded view of the scraper base of the present invention;

[0031] Figure 6 Schematic diagram of the structure of the scraper device of the present invention;

[0032] Figure 7 It is a structural schematic diagram of the fixing component and the driving component of the present invention.

[0033] In the picture:

[0034] 1 workbench, 2 resin tanks,

[0035] 3 drive components, 31 stepper motors,

[0036] 32 drive frame, 33 timing belt,

[0037] 34 guide rail, 35 slider 2,

[0038] 36 photoelectric racks, 4 scraper assemblies,

[0039] 41 scraper frame, 411 U-shaped frame,

[0040] 412 steps, 413 connecting plate,

[0041] 414 inner sink hole, 415 U-shaped through slot,

[0042] 42 scraper base, 421 base body,

[0043] 4211 groove channel, 422 connecting frame,

[0044] 4221 card slot, 4222 U-shaped bracket,

[0045] 4223 pin, 423 slider 1,

[0046] 4231 rib, 4232 guide ramp,

[0047] 4233 guide plane, 424 limiter,

[0048] 4241 fine-tuning screw, 4242 preload spring,

[0049] 43 scraper, 431 scraper body,

[0050] 432 connecting rib, 433 long groove,

[0051] 434 elastic plunger, 44 adjusting piece,

[0052] 441 regulating block, 4411 block body,

[0053] 4412 side ears, 442 adjustment rod,

[0054] 4421 cut surface, 4422 adjustment piece,

[0055] 443 return spring, 444 differential head,

[0056] 445 Hexagon socket set screw, 5 fixing components,

[0057] 51Z-shaped frame, 52Fixed plate,

[0058] 53 hand-tightened knurled screw, 54 photoelectric baffle,

[0059] 55 plywood. Implementation Method

[0060] In order to enable those skilled in the art to more clearly understand the technical solution of the present invention, a scraper assembly of the present invention is further described below with reference to the accompanying drawings. Example

[0061] like Figure 1-5A scraper assembly is shown, the scraper assembly 4 includes a scraper frame 41, an adjusting member 44 is provided on the scraper frame 41, a scraper 43 is provided at the bottom of the scraper frame 41, a scraper base 42 is provided between the scraper frame 41 and the scraper 43, the scraper base 42 includes a base body 421, and sliders 423 are slidably provided at both ends of the bottom of the base body 421. The slider 423 is mounted on the scraper 43 parallel to the running direction of the scraper 43 and is movably abutted against the scraper 43. The movement direction of the scraper 43 is changed by the movement of the slider 423; the slider 423 moves in the opposite direction after contacting the wall of the resin tank 2, pushing the scraper 43 to switch direction, thereby preventing the resin from accumulating on one side of the scraper 43.

[0062] Specifically, the scraper 43 includes a scraper body 431, which includes scraping blades on both sides. A cavity for storing resin is formed between the scraping blades. When slider 1 423 strikes the inner wall of one resin tank 2, it generates thrust, pushing the scraping blade on the same side of the tank 2 as the impacted one downward. The scraping blade on the other side correspondingly lifts upward, and the downward-moving scraping blade pushes the resin in the cavity. During the linear back-and-forth movement of the scraper assembly, slider 1 423 contacts the inner wall of the other resin tank 2 and moves in the opposite direction, pushing the scraping blades on both sides to switch directions and push the resin in the cavity in opposite directions. Multiple elastic plungers 434 are provided on the upper end surface of the scraper body 431, corresponding to slider 1 423. A guide surface is provided at the bottom of slider 1 423. As slider 1 423 slides, the elastic plungers 434 can elastically abut against the guide surface. In this embodiment, four elastic plungers 434 are symmetrically positioned on the upper end surface of the scraper body 431, two pairs symmetrically positioned on the two scraping blades. Two parallel sliders 423 flexibly abut against the two elastic plungers 434 in the direction of slider 1 423's movement, with the two elastic plungers 434 symmetrically corresponding to the ends of the guide surface at the bottom of slider 1 423. When the scraper 43 is pressed downward, the elastic plungers 434 offset the gaps caused by the tolerances of the mechanical components, ensuring that the scraper 43 does not move up and down during movement.

[0063] Specifically, the scraper frame 41 includes a U-shaped frame 411, the U-shaped wall of which is provided with a U-shaped through-slot 415. Steps 412 extend outward from the top of the two side walls of the U-shaped frame 411 along the slot. The steps 412 are provided with a recessed hole 414. A connecting plate 413 is provided at the top of one side of the step 412. The scraper 43 includes a scraper body 431, which has a V-shaped structure with higher sides and a lower center. A long slot 433 is provided in the center of the scraper body 431, and a connecting rib 432 is provided in the middle of the long slot 433 to connect the two sides of the scraper body 431 for scraping the layer.

[0064] The scraper base 42 includes a base body 421, and the bottom of the base body 421 is also set to a V-shaped structure to enable the bottom of the base body 421 to be inserted into the long groove 433 of the scraper 43, and the base body 421 and the scraper body 431 are connected by screws at both ends; the bottom of the base body 421 is concave to form a groove 4211 with the connecting rib 432 of the scraper 43, and two limit members 424 are symmetrically provided on the bottom end surface of the groove 4211 in the base body 421, which are respectively corresponding to the working ends on both sides of the scraper 43. The limit member 424 includes a pre-tightening spring 425 and a fine-tuning screw 424. After the fine-tuning screw 424 is sleeved with the pre-tightening spring 425, it passes through the threaded hole set on the groove 4211 and movably abuts against the connecting rib 432 of the scraper 43 to limit the height of the scraping layer on both sides of the scraper 43 and control the thickness of the scraping layer of the scraper 43. In the initial installation state, the two fine-tuning screws 4242 do not abut against the connecting rib 432; when the scraper assembly 4 moves to one side of the resin tank 2, the slider 1 423 collides with the inner wall of the resin tank 2, driving the scraper 43 on the collision side to move downward, and the lower end of the fine-tuning screw 4242 of the scraper 43 on the collision side abuts against the connecting rib 432, thereby limiting the rotation angle of the scraper 43 on this side (that is, the height of the scraper 43 scraping the layer); the same is true for the other side.

[0065] In addition, connecting frames 422 are provided at both ends of the top of the base body 421, the top of the connecting frame 422 is a U-shaped bracket 4222, the side wall of the U-shaped bracket 4222 is provided with a fastening hole, and a card slot 4221 is provided at the bottom of the connecting frame 422, and a slider 423 is clamped in the card slot 4221, and the slider 423 can move along the card slot 4221; a convex strip 4231 is provided on the top end face of the slider 423 to be clamped with the card slot 4221, and the bottom end face of the slider 423 is concave to form a U-shaped groove, and the guide surface includes a U-shaped groove The two side walls of the U-shaped groove are inclined outward to form guide slopes 4232, and guide planes 4233 are formed by the guide slopes 4232 extending outward from the groove. The bottom wall of the U-shaped groove is slightly longer than the width between the two corresponding elastic plungers 434 that are in contact with each other. Slider 1 432 moves along the slot 4221 until the guide slopes 4232 of the U-shaped groove abut against the elastic plungers 434, until the guide planes 4233 abut against the elastic plungers 434, thereby pressing down on the scraper 43 to achieve the leveling of the high-viscosity material in the resin tank 2. The guide planes 4233 are spaced approximately 8 mm apart horizontally. When the scraper assembly 4 moves to one side wall of the resin tank 2, the elastic plungers 435 can fully abut against the guide planes 4233, thereby ensuring that the scraper 43 consistently scrapes the material to a consistent height. Furthermore, the contact surface between slider 1 432 and the inner wall of the resin tank 2 is a perpendicular section, which effectively avoids the problem of large deviations in the scraped material thickness caused by inconsistent impact amplitudes on both sides. When the slider 1 432 fully presses down the scraper 43, the contact surface of the two is designed with an elastic gap of 0.3mm-0.5mm. When the thickness of the scraping layer is uneven, fine adjustment is made through the fine adjustment screw 424 to further ensure the consistency of the scraping layer thickness.

[0066] The adjustment member 44 includes an adjustment block 441, which is fixedly mounted on the top end surface of the step 412 of the U-shaped frame 411. The adjustment block 441 is provided with a micrometer head 444 and an adjustment rod 442. The bottom of the adjustment rod 442 is fixedly engaged with the connecting bracket 422 of the scraper base 42. The adjustment block 441 has an "X"-shaped structure and is mounted on the top steps 412 of the two side walls of the U-shaped frame 411. It includes a block body 4411, and side ears 4412 are provided on both sides of the bottom of the block body 4411. The side ears 4412 are fixedly connected to the U-shaped frame 411 by fastening screws. An adjusting plate 4422 is mounted on the adjusting rod 442. One end of the adjusting plate 4422 is fixed to the adjusting rod 442, while the other end is movably positioned between the adjusting block 442 and the top end surface of the step 412, and is secured to the micrometer head 444. A return spring 443 is mounted on the adjusting rod 442. The top of the return spring 443 abuts the adjusting plate 4422, while the bottom abuts the upper end surface of the internally recessed slot 414. This allows the adjusting rod 442 to be adjusted in height in coordination with the return spring 442 and the adjusting plate 4422. The micrometer head 444 is marked with a scale with an accuracy of 0.01 mm, enabling precise control of the scraping layer thickness. Specifically, the micrometer head 444 adjusts the height of the adjusting rod 442 by adjusting the position of the adjusting plate 4422, and the height of the scraper 43 by adjusting the tension of the return spring 443, thereby adjusting the scraping layer thickness.

[0067] Specifically, a cutout 4421 is provided at the bottom of the adjustment rod 442, and a transverse through-hole is provided in the cutout 4421. This allows the bottom of the adjustment rod 442 to pass through the inner recessed slot 414 and be hingedly secured to the U-shaped bracket 4222 of the base body 421 via a pin 4223 in the transverse through-hole in the cutout 4421. The hinged connection between the pin 4223 and the through-hole in the cutout 4421 (similar to a universal joint) prevents the adjustment rod 442 from becoming stuck during leveling of the scraper base 42. Because the adjustment rod 442 can only move up and down, the lack of connection / freedom in the adjustment rod 442 renders it unable to move when the scraper holder 41 is being horizontally leveled.

[0068] Continue reading Figure 4, in the specific operation process: Step 1: Assemble the adjusting rod 442, the return spring 443 and the connecting frame 422 through the pin 4223; Step 2: Press the elastic plunger 434 from top to bottom into the four corners of the scraper body 431, and then install the bottom of the base body 421 into the long groove 433 of the scraper body 431, and fasten it with screws; Step 3: Install the slider 1 423 into the slot 4221; Step 4: Screw the preload spring 425 and the fine-tuning screw 424 into the threaded hole on the groove 4211 of the base body 421 appropriately; Step 5: Pass the components assembled in step 1 through the scraper frame 41 and fix them to the base body 421; Step 6: Install the adjusting block 441, lock it by tightening the screws, install the differential head 444 into the adjusting block 441, and lock it with the hexagon socket set screw 445 to complete the assembly. Example

[0069] like Figure 6 The automatic scraper device shown includes a workbench 1, a resin tank 2 disposed on the workbench 1, and a scraper assembly 4 according to the first embodiment disposed within the resin tank 2. A fixing assembly 5 is disposed on one side of the resin tank 2 to securely support the scraper assembly 4. The fixing assembly 5 is mounted on a driving assembly 3 and moves along the Y-axis with the supporting assembly 5 to control the operation of the scraper assembly 4 within the resin tank 2. A backing plate 2 is disposed at the bottom of the resin tank 2 and secured to the workbench 1 via fasteners 21.

[0070] like Figure 7 As shown, the driving assembly 3 includes a stepper motor 31 arranged at one end of the guide rail 34, a driving wheel is set on the output shaft of the stepper motor 31, a driving frame 32 is set at the other end of the guide rail 34, a driven wheel is set on the driving frame 32, and the driving wheel and the driven wheel are connected by a synchronous belt 33 parallel to the guide rail 34.

[0071] The fixing assembly 5 includes a Z-shaped frame 51. The top of the Z-shaped frame 51 is secured to the connecting plate 413 of the scraper assembly 4 via a hand-tightened knurled screw 53. The bottom of the Z-shaped frame 51 is fixed to the guide rail 34 and moves synchronously with the guide rail 34 along the timing belt 33. Specifically, a slider 35 is provided on the guide rail 34, and a fixing plate 52 is provided on the slider 35. The fixing plate 52 is provided with a photoelectric baffle 54. The bottom of the fixing plate 52 is also mounted on the timing belt 33 in conjunction with a clamping plate 55. In addition, a photoelectric frame 36 is provided at the end of the guide rail 34 away from the resin tank 2. The photoelectric frame 36 has a waist-shaped hole, and a photoelectric switch is installed in the waist-shaped hole. The photoelectric switch and the waist-shaped hole are fixed together to achieve appropriate fine-tuning of the limit size.

[0072] It can be understood that the scraper assembly 44 is fixed to the Z-frame 51 by a hand-tightened knurled screw 53, the Z-frame 51 is installed and fixed to the slider 2 35 on the guide rail 34, the reciprocating motion of the guide rail 65 is driven by the stepper motor 31 through the synchronous belt 33, and the photoelectric baffle 54 on the fixed plate 52 cooperates with the photoelectric switch to limit the position of the device. The scraping reciprocating stroke of the device is set by the software and can be adjusted by the background as needed.

[0073] When the scraper device of the present application is in operation, the high-viscosity material to be printed is first added to the resin tank 2. When the stepper motor 31 drives the scraper assembly 44 to move to a position abutting the inner wall of the resin tank 2, the slider 1 423, due to the reverse force of the collision with the inner wall of the resin tank 2, moves in the opposite direction along the slot 4221 of the scraper base 43 until the slider 1 423 at the end of the collision with the inner wall of the resin tank 2 abuts the elastic plunger of the scraper body 431 on the same side and presses the scraper 43 downward. The side of the scraper 43 away from the resin tank 2 is lifted upward, with a certain height difference from the material coating, so as not to push the material back to the other side of the resin tank 2. The stepper motor 31 drives the scraper assembly 44 to reciprocate along the guide rail 34, greatly improving the efficiency of coating or scraping, thereby achieving the purpose of leveling the high-viscosity material.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A scraper assembly, characterized in that: include: A scraper frame (41), wherein an adjusting member (44) is provided on the scraper frame (41), a scraper (43) is provided at the bottom of the scraper frame (41), a scraper base (42) is provided between the scraper frame (41) and the scraper (43), and the scraper base (42) includes a base body (421), and sliders (423) are slidably provided at both ends of the bottom of the base body (421), and the sliders (423) are mounted on the scraper (43) in parallel with the running direction of the scraper (43) and are in movably contact with the scraper (43), and the moving direction of the scraper (43) is changed by the movement of the sliders (423); after the sliders (423) contact the wall of the resin tank (2), they move in the reverse direction, pushing the scraper (43) to switch direction, thereby preventing the resin from accumulating on one side of the scraper (43); The scraper (43) includes a scraper body (431), and the scraper body (431) includes scrapers on both sides. A cavity for storing resin is formed between the scrapers on both sides. When the slider 1 (423) hits the inner wall of the resin tank (2) on one side, a thrust is generated, which pushes the scraper on the same side of the resin tank (2) as the hit one side to move downward, and the scraper on the other side is correspondingly lifted upward, and the scraper moving downward pushes the resin in the cavity to move; during the linear back-and-forth movement of the scraper assembly, the slider 1 (423) contacts the inner wall of the resin tank (2) on the other side and moves in the opposite direction, pushing the scrapers on both sides to switch directions, and pushing the resin in the cavity in the opposite direction; A plurality of elastic plungers (434) are provided on the upper end surface of the scraper body (431) corresponding to the slider 1 (423), and a guide surface is provided at the bottom of the slider 1 (423). During the sliding process of the slider 1 (423), the elastic plungers (434) can elastically abut against the guide surface.

2. A scraper assembly according to claim 1, characterized in that: A plurality of limiting members (424) are provided on the scraper base (42).

3. A scraper assembly according to claim 2, characterized in that: The limiting member (424) comprises a fine-tuning screw (4241) fixedly coupled with the scraper base (42), and a preload spring (4242) is sleeved on the fine-tuning screw (4241).

4. The scraper assembly according to claim 1, characterized in that: The adjusting member (44) comprises an adjusting block (441), the adjusting block (441) being fixedly arranged on the scraper frame (41), an adjusting rod (442) being provided on the adjusting block (441), and a bottom of the adjusting rod (442) being hingedly connected to the scraper base (42).

5. The scraper assembly according to claim 4, characterized in that: A cut surface (4421) is provided at the bottom of the adjusting rod (442), and a transverse through hole is provided on the cut surface (4421).

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