A sanding device

Abstract

The utility model belongs to 3D printing equipment field especially, and it is a kind of sand laying device, including sand receiving hopper, sand laying hopper and sand laying device main beam, sand guide plate, scraper seat and sand guide plate mounting seat are arranged below sand laying hopper, sand guide plate mounting seat is arranged between sand guide plate and scraper seat, still include linear motion component and driving part, linear motion component includes moving piece and fixed part, moving piece is fixedly connected with scraper seat by upper connecting block, and fixed part is fixedly connected with the lower end surface of sand laying device main beam, when driving part drives vibration connecting block swing, vibration connecting block drives scraper seat to move, since linear motion component can only move in front and back direction, make scraper seat only vibrate in front and back direction.

Description

Technical Field

[0001] This utility model belongs to the field of 3D printing equipment, and in particular a sand-laying device. Background Technology

[0002] 3DP (Three-Dimensional Printing, a common term for binder jetting) technology is based on digital model files and uses powdered molding sand, metal, ceramics, and other adhesive materials to create parts by printing and curing them layer by layer. It is one of the main methods of additive manufacturing.

[0003] The invention patent entitled "A Sand Spreader" with patent number "ZL201910810418.1" discloses a sand spreader. The problem is that the scraper vibrates in both the up-down and back-and-forth directions at the same time, i.e., in an oscillating manner. This movement will cause horizontal lines to form on the sand surface after the scraper flattens the sand during sand spreading, as shown in Figure 6. This affects the strength of the product and reduces its quality. In addition, the scraper needs to be fixed on the inner side, which makes disassembly and maintenance inconvenient. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this utility model proposes a sand-spreading device that, after being smoothed by a scraper during sand spreading, produces a flat sand surface without horizontal lines. The technical problem to be solved by this utility model is achieved through the following technical solution: A sand-spreading device includes a sand-receiving hopper, a sand-spreading hopper, and a main beam of the sand-spreading device. The sand-receiving hopper is fixedly connected to the sand-spreading hopper, and the sand-spreading hopper is fixedly connected to the main beam of the sand-spreading device. A sand guide plate, a scraper seat, and a sand guide plate mounting seat are arranged below the sand-spreading hopper. The sand guide plate mounting seat is arranged between the sand guide plate and the scraper seat. The device also includes a linear motion component and a driving component. The linear motion component includes a moving part and a fixed part. The moving part is fixedly connected to the scraper seat through an upper connecting block, and the fixed part is fixedly connected to the lower end face of the main beam of the sand-spreading device. When the driving component drives the vibrating connecting block to swing, the vibrating connecting block drives the scraper seat to move. Since the linear motion component can only move in the back-and-forth direction, the scraper seat only vibrates in the back-and-forth direction.

[0005] Furthermore, the linear motion components are linear guides, linear bearings, oilless bushings, or ball screws.

[0006] Furthermore, a lower connecting block is provided on the side of the scraper holder, and the vibration connecting block is hinged to the lower connecting block by a pin.

[0007] Furthermore, the driving component is a first motor, the output shaft of the first motor is fixedly connected to the rotating shaft, an eccentric bushing is provided on the rotating shaft, and the vibration connecting block is sleeved on the eccentric bushing.

[0008] Specifically, the first motor is fixedly connected to the main beam of the sand-laying device via a motor mounting base, and the rotating shaft is fixedly connected to the main beam of the sand-laying device via a rotating shaft seat.

[0009] Specifically, it also includes side scraping plates, which are set on both sides of the scraper holder.

[0010] Specifically, a sand baffle is installed at the upper end of the scraper holder.

[0011] Even better, the scraper should be placed at the bottom of the scraper holder.

[0012] Even better, the scraper has a straight-line structure.

[0013] Ideally, the number of linear motion components should be at least two.

[0014] The scraper of this invention only vibrates in the back-and-forth direction, without vibration in the up-and-down direction. This results in a smooth surface after the scraper flattens the sanded surface without horizontal lines, thus improving product quality. Furthermore, the scraper is fixed at the bottom, making it very easy to disassemble and maintain. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Exploded view; Figure 3 for Figure 1 A bottom view; Figure 4 for Figure 1 Enlarged side cross-sectional view.

[0016] Explanation of reference numerals in the attached figures: 101-Second motor, 102-Motor mounting base, 103-Sand receiving hopper, 104-Sand spreading hopper cover plate, 105-Sand spreading hopper, 106-Spiral stirring shaft, 107-Stirring shaft bearing seat, 201-Main beam of sand spreading device, 301-Sand guide plate mounting base, 302-Side scraper plate, 303-Scraper seat, 304-Upper connecting block, 305-Lower connecting block, 306-Linear motion component, 3061-Slider, 3062-Guide rail, 307-Sand baffle plate, 308-Sand guide plate, 309-Lower sand plate, 310-Scraper, 401-Rotating shaft, 402-Eccentric bushing, 403-Vibration connecting block, 404-Rotating shaft seat, 405-Motor mounting base, 406-First motor, 501-First sand outlet, 502-Second sand outlet. Detailed Implementation

[0017] Combination Figures 1 to 4As shown, a sand-spreading device includes a sand receiving hopper 103, a sand spreading hopper 105, and a sand-spreading device main beam 201. The sand receiving hopper 103 is fixedly connected to the sand spreading hopper 105, and the sand spreading hopper 105 is fixedly connected to the sand-spreading device main beam 201. A sand guide plate 308, a scraper seat 303, and a sand guide plate mounting seat 301 are provided below the sand spreading hopper 105. The sand guide plate mounting seat 301 is located between the sand guide plate 308 and the scraper seat 303. The device also includes a linear motion component 306 and a driving component. The linear motion component 306 includes a moving part and a fixed part. The moving part is fixedly connected to the scraper seat 303 through an upper connecting block 304, and the fixed part is fixedly connected to the lower end face of the sand-spreading device main beam 201.

[0018] When the driving component drives the vibrating connecting block 403 to swing, the vibrating connecting block 403 drives the scraper seat 303 to move. Since the linear motion component 306 can only move in the back and forth direction, and the scraper seat 303 is connected to the moving part of the linear motion component 306, the scraper seat 303 can only move with the moving part, so that the scraper seat 303 only vibrates in the back and forth direction, thereby realizing the simultaneous spreading of sand and smoothing. After smoothing, the sand surface is flat and there are no horizontal lines.

[0019] The linear motion component 306 can realize reciprocating linear motion function, and can be a linear guide, linear bearing, oilless bushing or ball screw. The number of linear motion components 306 is at least 2. In this embodiment, the linear motion component 306 is a linear guide, and there are 3 of them. The linear guide includes a slider 3061 and a guide rail 3062. The slider 3061 slides on the guide rail 3062. The slider 3061 is fixedly connected to the scraper seat 303 through the upper connecting block 304. The guide rail 3062 is fixedly connected to the lower end face of the sand spreading device main beam 201. The sand spreading device main beam 201 is connected to the sand spreading transmission component of the 3D printing equipment.

[0020] In this embodiment, a spiral stirring shaft 106 is provided inside the sand spreading hopper 105. One end of the spiral stirring shaft 106 is connected to the stirring shaft bearing seat 107, and the other end is connected to the motor mounting seat 102. The spiral stirring shaft 106 is driven by a second motor 101, which is fixed on the motor mounting seat 102. A sand spreading hopper cover plate 104 is provided above the sand spreading hopper 105 to prevent sand from overflowing. The motor mounting seat 102 and the stirring shaft bearing seat 107 in this embodiment contain structures such as couplings, bearings, and snap rings.

[0021] The driving component is a first motor 406. The output shaft of the first motor 406 is fixedly connected to the rotating shaft 401. An eccentric bushing 402 and a vibration connecting block 403 are provided on the rotating shaft 401. The vibration connecting block 403 is sleeved on the eccentric bushing 402, and the eccentric bushing 402 passes through the rotating shaft 401 and is fixed by a set screw. The first motor 406 is fixedly connected to the main beam 201 of the sand-laying device through a motor mounting base 405, and the rotating shaft 401 is fixedly connected to the main beam 201 of the sand-laying device through a rotating shaft seat 404.

[0022] A lower connecting block 305 is provided on the side of the scraper holder 303. The vibration connecting block 403 is hinged to the lower connecting block 305 by a pin. It also includes a side scraping sand plate 302, which is provided on both sides of the scraper holder 303. The function of the side scraping sand plate 302 is to scrape away the sand on both sides of the printing platform during sand spreading to prevent sand from accumulating on both sides.

[0023] In this embodiment, there are multiple sand guide plate mounting seats 301. One side of the sand guide plate mounting seat 301 is fixedly connected to the sand guide plate 308, and the other side of the sand guide plate mounting seat 301 is fixedly connected to the scraper seat 303. A sand storage cavity is formed between the sand guide plate 308, the scraper seat 303 and the two sand guide plate mounting seats 301 located at both ends.

[0024] A lower sand plate 309 is provided on the outside of the sand guide plate 308. The lower sand plate 309 is fixedly connected to the sand guide plate 308. A sand baffle 307 is provided at the upper end of the scraper seat 303 to prevent sand from leaking out of the sand storage chamber. A scraper 310 is provided at the bottom of the scraper seat 303. The scraper 310 has a straight structure. When installing the scraper 310, it can be fixed to the bottom of the scraper seat 303 by screws from below.

[0025] The sand guide plate mounting base 301, upper connecting block 304, lower connecting block 305, eccentric bushing 402, vibration connecting block 403, and rotating shaft seat 404 can be configured as multiple pieces according to actual conditions. In this embodiment, the vibration connecting block 403, rotating shaft seat 404, and motor 405 mounting base contain couplings, bearings, snap rings, locking sleeves, and other structures.

[0026] The working process of this utility model is as follows: The sand falls into the sand receiving hopper 103. The second motor 101 drives the spiral stirring shaft 106 to rotate, spreading the sand to fill the inner cavity of the sand spreading hopper 105 and falling into the sand storage cavity. At this time, the first sand outlet 501 is less than or equal to the static angle of repose of the sand, and the sand will not slip down.

[0027] The guide plate 308 has a waist hole, which can adjust the size of the first sand outlet 501. The lower sand plate 309 has a waist hole, which can adjust the size of the second sand outlet 502. The size of the first sand outlet 501 and the second sand outlet 502 are adjusted according to the specific material and humidity of the sand and the speed of the sand spreading device to achieve the best sand spreading effect.

[0028] When sand is laid, the first motor 406 drives the rotating shaft 401 to rotate, and the eccentric bushing 402 rotates with the rotating shaft 401. Since the eccentric bushing 402 is an eccentric structure, the vibrating connecting block 403 will swing. However, since the linear motion component 306 can only move in the back and forth direction, the vibrating connecting block 403 can only vibrate in the back and forth direction when it needs to swing, thereby driving the scraper seat 303 to vibrate in the back and forth direction.

[0029] The vibration causes the sand accumulated in the sand storage chamber to flow out from the second sand outlet 502 and fall onto the printing work surface. At the same time, the sand spreading device moves horizontally, and the scraper 310 scrapes the sand that has fallen onto the printing work surface. Compared with the sand spreading effect after scraping in the prior art, the sand surface after scraping by the scraper of this utility model is flat and there are no horizontal lines on the sand surface.

[0030] In summary, the scraper of this utility model only vibrates in the back-and-forth direction and not in the up-and-down direction, so that after the scraper flattens the sanded surface, the sanded surface is flat and there are no horizontal lines, thus improving the product quality; and the scraper is fixed at the bottom, which makes it very convenient to disassemble and maintain.

Claims

1. A sand-spreading device, comprising a sand-receiving hopper, a sand-spreading hopper, and a main beam of the sand-spreading device, wherein the sand-receiving hopper is fixedly connected to the sand-spreading hopper, the sand-spreading hopper is fixedly connected to the main beam of the sand-spreading device, a sand guide plate, a scraper seat, and a sand guide plate mounting seat are provided below the sand-spreading hopper, and the sand guide plate mounting seat is disposed between the sand guide plate and the scraper seat, characterized in that, It also includes a linear motion component and a drive component. The linear motion component includes a moving part and a fixed part. The moving part is fixedly connected to the scraper seat through an upper connecting block, and the fixed part is fixedly connected to the lower end face of the main beam of the sand spreading device. When the driving component drives the vibrating connecting block to swing, the vibrating connecting block drives the scraper seat to move. Since the linear motion component can only move in the forward and backward direction, the scraper seat only vibrates in the forward and backward direction.

2. The sand-laying device according to claim 1, characterized in that, The linear motion component is a linear guide, linear bearing, oilless bushing, or ball screw.

3. The sand-laying device according to claim 1, characterized in that, A lower connecting block is provided on the side of the scraper seat, and the vibration connecting block is hinged to the lower connecting block by a pin.

4. The sand-laying device according to claim 1, characterized in that, The driving component is a first motor, the output shaft of the first motor is fixedly connected to the rotating shaft, an eccentric bushing is provided on the rotating shaft, and the vibration connecting block is sleeved on the eccentric bushing.

5. The sand-laying device according to claim 4, characterized in that, The first motor is fixedly connected to the main beam of the sand-spreading device via a motor mounting base, and the rotating shaft is fixedly connected to the main beam of the sand-spreading device via a rotating shaft seat.

6. The sand-laying device according to claim 1, characterized in that, It also includes side scraping plates, which are disposed on both sides of the scraper holder.

7. The sand-laying device according to claim 1, characterized in that, A sand baffle is provided at the upper end of the scraper seat.

8. The sand-laying device according to claim 1, characterized in that, A scraper is provided at the bottom of the scraper holder.

9. The sand-laying device according to claim 8, characterized in that, The scraper has a straight, horizontal structure.

10. The sand-laying device according to claim 1, characterized in that, The number of linear motion components is at least two.

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