Sand mould printer screed

Abstract

This utility model discloses a sand-spreading device for a sand mold printer, comprising: a sand-spreading cart whose reciprocating direction is laterally; and a scraping mechanism including a scraper extending forward and backward and a mounting frame connected to the sand-spreading cart. The scrapers are spaced laterally on the sides of the sand-spreading cart, and are rotatably connected to the mounting frame via a first rotating shaft extending forward and backward. The mounting frame is equipped with a drive assembly for driving the scraper to rotate. The drive assembly drives the scraper to a first stop state and a second stop state. In the first stop state, the bottom of the scraper is located at a first position, and in the second stop state, the bottom of the scraper is located at a second position. The first position protrudes downward from the sand-spreading cart and is located below the second position. During sand spreading, the drive assembly can be controlled to drive the scraper to the second stop state. At this time, the bottom position of the scraper is higher, and the scraper will not scrape the sand surface, avoiding the problem of the scraper pushing the molding sand to the right, thus eliminating the need for additional manual cleaning.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, and in particular to a scraping device for a sand mold printer. Background Technology

[0002] Layer-by-layer sand laying is an important process in sand mold 3D printers. To ensure that the thickness of each layer of molding sand is uniform, a leveling device is required. The leveling device usually includes a scraper, which is fixedly installed on the sand laying carriage. When the sand laying carriage moves to the right to lay a layer of molding sand, and then moves back to the left, the scraper can level the laid molding sand and push the excess molding sand to the left. A molding sand recycling mechanism is provided on the left side of the printing table to realize the automatic recycling of molding sand.

[0003] However, during use, it was found that such a leveling device still has some shortcomings. For example, a single leveling operation cannot make the sand surface completely flat. As the next round of sand spreading begins, the scraper pushes a small amount of molding sand to the right as it moves with the sand spreading vehicle. Since there is no molding sand recovery mechanism on the right side of the printing table, this portion of molding sand pushed to the right cannot be automatically recovered. As the printing process progresses, more and more molding sand accumulates on the right side of the printing table, requiring additional manpower for cleaning and reducing the work efficiency of the staff. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a leveling device for a sand mold printer.

[0005] The sand mold printer leveling device according to an embodiment of the present invention includes:

[0006] The sand-spreading truck moves laterally in its reciprocating direction.

[0007] The leveling mechanism includes a scraper extending forward and backward and a mounting frame connected to the sand-spreading vehicle. The scraper is arranged laterally at intervals on the side of the sand-spreading vehicle. The scraper is rotatably connected to the mounting frame via a first rotating shaft extending forward and backward. The mounting frame is provided with a drive assembly for driving the scraper to rotate. The drive assembly drives the scraper to a first stop state and a second stop state. In the first stop state, the bottom of the scraper is located at a first position. In the second stop state, the bottom of the scraper is located at a second position. The first position protrudes downward from the sand-spreading vehicle and is located below the second position.

[0008] The sand-spreading device for a sand mold printer according to an embodiment of the present invention has at least the following technical effects: During use, when the sand-spreading cart moves to the right to spread sand, the drive component can be controlled to drive the scraper to the second stop state. At this time, the bottom position of the scraper is higher, and the scraper will not flatten the sand surface, avoiding the problem of the scraper pushing the molding sand to the right, causing more and more molding sand to accumulate on the right side of the printing table. No extra manpower is required for cleaning, which helps to improve the work efficiency of the staff. After the sand-spreading cart completes the sand-spreading work, the drive component is controlled to drive the scraper to the first stop state, and then the sand-spreading cart moves to the left to return. At this time, the bottom position of the scraper is lower, and the scraper can flatten the spread molding sand and push the excess molding sand to the left to achieve automatic recycling of molding sand.

[0009] According to some embodiments of the present invention, a roller brush is provided between the scraper and the sand-laying vehicle, and in the second stationary state, the roller brush is in contact with the bottom of the scraper.

[0010] According to some embodiments of the present invention, the mounting frame has a main frame and a sliding seat, the sliding seat is movably disposed on the main frame in a transverse direction, a first locking member is connected between the sliding seat and the main frame, and the roller brush is disposed on the sliding seat.

[0011] According to some embodiments of the present invention, with the scraper positioned to the right relative to the sand-laying vehicle, in the second stationary state, the scraper is tilted downwards from right to left.

[0012] According to some embodiments of the present invention, in the first stationary state, the scraper is vertically arranged.

[0013] According to some embodiments of the present invention, the scraper is fixedly connected to the first rotating shaft, and the driving component is used to drive the first rotating shaft to rotate.

[0014] According to some embodiments of the present invention, the drive assembly includes a rocker arm and a linear actuator. The rocker arm extends radially along the first rotating shaft, and the main body and drive portion of the linear actuator are respectively hinged to the mounting bracket and the rocker arm.

[0015] According to some embodiments of this utility model, the linear actuator is a cylinder.

[0016] According to some embodiments of the present invention, the mounting bracket is provided with an abutment block, and in the first stationary state, the swing arm abuts against the abutment block circumferentially along the first rotating shaft.

[0017] According to some embodiments of the present invention, the abutment block is slidably disposed on the mounting frame along the first track, the first track being out of plane with the first rotating shaft, and a second locking member is connected between the abutment block and the mounting frame.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the sand mold printer leveling device according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the main structure of the sand mold printer leveling device according to an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 A partial sectional view;

[0023] In the attached image:

[0024] 100-Sand spreading truck; 211-Front support plate; 212-Rear support plate; 213-Avoidance groove; 214-Second waist-shaped groove; 220-First rotating shaft; 221-Scraper; 222-Swing rod; 223-Abutting block; 229-Cylinder; 230-Roller brush; 231-Second motor; 232-Transfer seat; 233-First waist-shaped groove. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number, while "above," "below," "within," etc., are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0027] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0028] The following is for reference. Figures 1 to 3 This invention describes a sand mold printer leveling device according to an embodiment of the present invention.

[0029] The sand mold printer leveling device of this utility model embodiment refers to... Figure 1 It includes a sand-spreading vehicle 100 and a leveling mechanism.

[0030] The front and rear ends of the sand spreading cart 100 are equipped with horizontally extending sliders that are adapted to the horizontally extending guide rails on the sand mold printer, so that the sand spreading cart 100 moves back and forth in a horizontal direction and the sand spreading direction of the sand spreading cart 100 is horizontal. The sand spreading cart 100 is a conventional component in this field, and its specific structure will not be described in detail here.

[0031] The leveling mechanism includes a scraper 221 extending forward and backward and a mounting frame connected to the sand-spreading vehicle 100. The mounting frame includes a front support plate 211 and a rear support plate 212. The scraper 221 is laterally spaced along the sides of the sand-spreading vehicle 100 so that it does not obstruct the sand-spreading operation of the vehicle. The scraper 221 is a strip-shaped plate extending forward and backward. The scraper 221 is rotatably connected to the mounting frame via a first rotating shaft 220 extending forward and backward. The front end of the first rotating shaft 220 is rotatably mounted on the front support plate 211, and the rear end of the first rotating shaft 220 is rotatably mounted on the rear support plate 212. The mounting bracket is equipped with a drive assembly for driving the scraper 221 to rotate. The drive assembly can be directly connected to the scraper 221. When the scraper 221 is fixedly connected to the first rotating shaft 220, the drive assembly can be connected to the first rotating shaft 220. The drive assembly drives the scraper 221 in a first stop state and a second stop state. In the first stop state, the bottom of the scraper 221 is located in a first position. In the second stop state, the bottom of the scraper 221 is located in a second position. The first position protrudes downward from the sand spreading vehicle 100 and is located below the second position.

[0032] Taking the scraper 221 located on the right side of the sand-spreading cart 100 as an example, during use, when the sand-spreading cart 100 moves to the right to spread sand, the drive component can be controlled to drive the scraper 221 to the second stop state. At this time, the bottom position of the scraper 221 is higher, and the scraper 221 will not flatten the sand surface, avoiding the problem of the scraper 221 pushing the molding sand to the right, causing more and more molding sand to accumulate on the right side of the printing table. No extra manpower is required for cleaning, which helps to improve the work efficiency of the staff. After the sand-spreading cart 100 completes the sand-spreading work, the drive component is controlled to drive the scraper 221 to the first stop state. Then the sand-spreading cart 100 moves to the left to return. At this time, the bottom position of the scraper 221 is lower, and the scraper 221 can flatten the spread molding sand and push the excess molding sand to the left to achieve automatic recycling of molding sand.

[0033] It is understandable that the molding sand used in the printing process is not dry quartz sand, but a substance with a certain degree of stickiness mixed with a curing agent. During the process of scraping the sand surface with scraper 221, the molding sand may accumulate on scraper 221 and clump together, resulting in poor subsequent scraping effect.

[0034] Therefore, in some embodiments of this utility model, a roller brush 230 is provided between the scraper 221 and the sand spreading vehicle 100. In the second stationary state, the roller brush 230 contacts the bottom of the scraper 221. The front end and rear end of the roller brush 230 are rotatably connected to the mounting frame, which is equipped with a second motor 231 for driving the roller brush 230 to rotate. In this way, in the second stationary state, the second motor 231 can be controlled to drive the roller brush 230 to rotate, and the roller brush 230 can clean the molding sand accumulated on the scraper 221, avoiding the problem of molding sand clumping on the scraper 221, and achieving a better leveling effect.

[0035] In some embodiments of this utility model, the mounting bracket has a main frame and a sliding seat 232. The sliding seat 232 is movably disposed on the main frame in a transverse direction. A first locking member is connected between the sliding seat 232 and the main frame. The roller brush 230 is disposed on the sliding seat 232. There are two translation seats 232, which are respectively set at both ends of the roller brush 230. The second motor 231 is set on one of the translation seats 232. The drive shaft of the second motor 231 is connected to the end of the roller brush 230 through a coupling. The two translation seats 232 are respectively stacked on the front support plate 211 and the rear support plate 212. The front support plate 211 and the rear support plate 212 are provided with clearance grooves 213 corresponding to the movement range of the roller brush 230. In this way, the lateral position of the roller brush 230 can be adjusted. When the roller brush 230 has a certain wear, the lateral position of the roller brush 230 can be adjusted towards the scraper 221 to make the roller brush 230 clean the scraper 221 better.

[0036] The translation seat 232 is provided with a first waist-shaped groove 233 extending laterally at its upper left, lower left, upper right, and lower right ends. The first locking element is a first bolt. Each translation seat 232 is connected to the mounting frame with four first bolts. The four first bolts are set one-to-one in the four first waist-shaped grooves 233. The first bolts pass through the first waist-shaped grooves 233 and are threadedly connected to the mounting frame. Loosening the first bolts can adjust the lateral position of the translation seat 232, and tightening the first bolts can lock the current position of the translation seat 232. The structure is simple and the adjustment is convenient.

[0037] In some embodiments of this utility model, with the scraper 221 positioned to the right relative to the sand-spreading vehicle 100, in the second stationary state, the scraper 221 is inclined downwards from right to left. Thus, the roller brush 230 is positioned above the scraper 221, and during the process of cleaning the molding sand on the scraper 221, the roller brush 230 can prevent the molding sand from splashing upwards.

[0038] In some embodiments of this invention, the scraper 221 is vertically positioned in the first stationary state. This allows for precise removal of excess molding sand during the leveling process without causing additional compaction or disturbance.

[0039] In some embodiments of this invention, the scraper 221 is fixedly connected to the first rotating shaft 220, and the drive assembly is used to drive the first rotating shaft 220 to rotate. This allows the drive assembly to be connected to the end of the first rotating shaft 220, thus keeping it relatively far from the scraper 221 and preventing sand particles from splashing and affecting the operation of the drive assembly.

[0040] In some embodiments of this utility model, reference is made to Figure 2The drive assembly includes a rocker arm 222 and a linear actuator. The rocker arm 222 extends radially along the first rotating shaft 220. The main body and drive part of the linear actuator are respectively hinged to the mounting bracket and the rocker arm 222. This structure is simple and easy to set up. In the first stationary state, the rocker arm 222 is inclined upward from left to right. The first rotating shaft 220 is connected to the middle of the rocker arm 222, and the linear actuator is located above the upper right end of the rocker arm 222. The linear actuator can be a cylinder 229, with the main body being the cylinder body of the cylinder 229 and the drive part being the piston rod of the cylinder 229. The hinge axis at the hinge point between the drive part and the rocker arm 222 is called the first hinge axis, which is parallel to the first rotating shaft 220. In order to ensure that the forces on both ends of the first rotating shaft 220 are balanced, the number of drive components can be set to two. The two drive components are respectively connected to the two ends of the first rotating shaft 220. The two ends of the first rotating shaft 220 pass through the front support plate 211 and the rear support plate 212 respectively. The two drive components are respectively set on the opposite sides of the front support plate 211 and the rear support plate 212 to prevent the sand particles thrown out by the roller brush 230 during the cleaning of the scraper 221 from splashing onto the linear drive.

[0041] In some embodiments of this invention, the linear actuator is a cylinder 229. This results in a simple structure, easy setup, low cost, and easy operation.

[0042] In some embodiments of this utility model, the mounting bracket is provided with an abutment block 223. In the first stationary state, the swing arm 222 abuts against the abutment block 223 along the circumference of the first rotating shaft 220. In the first stationary state, the abutment block 223 is located on the lower right side of the lower left end of the swing arm 222. The torque generated by the reaction force of the scraper 221 when it moves to the left to push molding sand is opposite in direction to the torque generated by the force exerted by the abutment block 223 on the swing arm 222. Even if the linear actuator does not apply force to the swing arm 222, the scraper 221 can still push molding sand to the left. In addition, the abutment block 223 can limit the rotation angle of the first rotating shaft 220. In the first stationary state, the linear actuator can continuously apply an upward force to the upper right end of the swing arm 222, pressing the swing arm 222 against the abutment block 223 to prevent the scraper 221 from shaking during the leveling process.

[0043] In some embodiments of this utility model, the abutment block 223 is slidably disposed on the mounting frame along a first track, the first track being coplanar with the first rotating shaft 220, and a second locking member is connected between the abutment block 223 and the mounting frame. The first track is inclined downward from left to right, see reference. Figure 3The front support plate 211 and the rear support plate 212 are provided with a second waist-shaped groove 214 parallel to the first track. The second locking element is a second bolt, which passes through the second waist-shaped groove 214 and is threaded to the abutment block 223. Loosening the second bolt allows the position of the abutment block 223 to be adjusted along the first track, and tightening the second bolt fixes the current position of the abutment block 223. This allows the position of the abutment block 223 to be adjusted, thereby adjusting the position of the scraper 221 in the first stopping state, so that the scraper 221 remains vertical. The height of the first position can also be adjusted by adjusting the position of the scraper 221, thereby adjusting the thickness of each layer of molding sand.

[0044] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A leveling device for a sand mold printer, characterized in that, include: The sand-spreading truck moves laterally in its reciprocating direction. The leveling mechanism includes a scraper extending forward and backward and a mounting frame connected to the sand-spreading vehicle. The scraper is arranged laterally at intervals on the side of the sand-spreading vehicle. The scraper is rotatably connected to the mounting frame via a first rotating shaft extending forward and backward. The mounting frame is provided with a drive assembly for driving the scraper to rotate. The drive assembly drives the scraper to a first stop state and a second stop state. In the first stop state, the bottom of the scraper is located at a first position. In the second stop state, the bottom of the scraper is located at a second position. The first position protrudes downward from the sand-spreading vehicle and is located below the second position.

2. The sand mold printer leveling device according to claim 1, characterized in that: A roller brush is provided between the scraper and the sand-laying vehicle. In the second stationary state, the roller brush is in contact with the bottom of the scraper.

3. The sand mold printer leveling device according to claim 2, characterized in that: The mounting frame has a main frame and a sliding seat. The sliding seat is movably disposed on the main frame in a transverse direction. A first locking member is connected between the sliding seat and the main frame. The roller brush is disposed on the sliding seat.

4. The sand mold printer leveling device according to claim 2, characterized in that: With the scraper positioned to the right relative to the sand-laying vehicle, in the second stationary state, the scraper is tilted downwards from right to left.

5. The sand mold printer leveling device according to claim 1, characterized in that: In the first stationary state, the scraper is set vertically.

6. The sand mold printer leveling device according to claim 1, characterized in that: The scraper is fixedly connected to the first rotating shaft, and the drive assembly is used to drive the first rotating shaft to rotate.

7. The sand mold printer leveling device according to claim 6, characterized in that: The drive assembly includes a rocker arm and a linear actuator. The rocker arm extends radially along the first rotating shaft, and the main body and drive portion of the linear actuator are respectively hinged to the mounting bracket and the rocker arm.

8. The sand mold printer leveling device according to claim 7, characterized in that: The linear actuator is a cylinder.

9. The sand mold printer leveling device according to claim 7, characterized in that: The mounting bracket is equipped with an abutment block. In the first stationary state, the swing arm abuts against the abutment block circumferentially along the first rotating shaft.

10. The sand mold printer leveling device according to claim 9, characterized in that: The abutment block is slidably disposed on the mounting frame along the first track, the first track being out of plane with the first rotating shaft, and a second locking member is connected between the abutment block and the mounting frame.

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