Powder spreading device for micro-droplet jetting 3D printing equipment

Abstract

The invention provides a powder spreading device for droplet jetting 3D printing equipment, which comprises a mounting beam frame and a powder storage tank mounted on one side of the mounting beam frame, a powder outlet is formed in the bottom of the powder storage tank, a vibration assembly is further mounted on the mounting beam frame and comprises a vibration power mechanism fixed on the mounting beam frame and a vibration scraper blade, and the vibration scraper blade is located below the powder outlet. The vibrating device is used for uniformly dispersing powder laid on the surface of a powder bed below in a vibrating manner; the powder spreading device for the droplet jetting 3D printing equipment further comprises a powder scattering assembly, the powder scattering assembly comprises a comb plate located in the powder storage tank and a comb power mechanism connected with the comb plate, the comb power mechanism is connected with the mounting beam frame, and the comb power mechanism outputs reciprocating motion to drive the comb plate to stir in the powder storage tank in a reciprocating mode. The powder spreading device is used for loosening powder in a powder storage tank so as to guarantee powder falling of a powder outlet, and the problems that existing micro-droplet jetting 3D printing equipment is poor in powder spreading uniformity and is obviously limited by the powder state are solved.

Description

Technical Field

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

[0002] 3D printing (3DP), also known as additive manufacturing technologies (AM), is a technology that manufactures physical parts by accumulating materials layer by layer based on 3D CAD data. The traditional droplet jet 3DP printer uses the powder spreading method that the powder particles pass through the hopper slope and fall naturally to the powder spreading surface under the action of gravity and vibration module. Due to its powder spreading method, this powder spreading method cannot achieve quantitative feeding and powder spreading density adjustment in most cases.

[0003] And due to its structure, the traditional powder spreader can only spread a relatively single type of powder, and has relatively high requirements for the powder particle size and viscosity. When the ambient humidity changes or the powder viscosity is high, the powder outlet will often be blocked, resulting in powder spreading failure or poor powder spreading effect. When the powder particles to be laid are finer, the powder is prone to become too sticky or too dry under the action of the liquid catalyst added to the powder, making it difficult to drop the powder or leaking the powder, which leads to powder spreading failure or poor powder spreading effect. It can be seen that when the traditional powder spreading structure is laying easy-to-agglomerate powder, the powder falls onto the powder bed in clumps at the microscopic level, so it is impossible to achieve uniform powder spreading, and the adaptability to powder particle size is poor.

[0004] In summary, the existing droplet jet 3D printing equipment has poor powder spreading uniformity and is obviously restricted by the powder state. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing droplet jet 3D printing equipment has poor powder spreading uniformity and is obviously restricted by the powder state. To solve the above problems, the present invention provides a powder spreading device for a droplet jet 3D printing device, comprising a mounting beam and a powder storage tank installed on one side of the mounting beam for temporarily storing powder to be spread, a long strip powder outlet is arranged at the bottom of the powder storage tank, and the mounting beam is also equipped with a vibration component, the vibration component comprises a vibration power mechanism fixed to the mounting beam and a vibration scraper connected to the vibration power mechanism, the vibration scraper is located below the powder outlet, and is used to uniformly disperse the powder spread on the surface of the powder bed below by vibration; the powder spreading device for a droplet jet 3D printing device also includes a powder sparse component, the powder sparse component comprises a comb plate located in the powder storage tank and a comb power mechanism connected to the comb plate, the comb power mechanism is connected to the mounting beam, and the comb power mechanism outputs reciprocating motion to drive the comb plate to stir reciprocally in the powder storage tank, so as to loosen the powder in the powder storage tank to ensure the powder falling from the powder outlet.

[0006] The powder spreading device for droplet jet 3D printing equipment provided by the present invention optimizes the structure and principle of the existing powder spreading device. The main structure includes a powder storage tank for temporarily storing and accommodating powder. The bottom of the powder storage tank has a long strip powder outlet. First, the length of the powder outlet can adapt to the width of the powder bed of the 3D printing equipment. Second, the narrow and long outlet can avoid accumulation of excessive powder in a local area. In order to assist the powder outlet and make the distribution of powder on the powder bed more uniform and flat, a vibration component is provided. The vibration action output drives the vibration scraper located at a certain distance from the upper surface of the powder bed to vibrate. In order to scrape and press the powder laid through the powder outlet to a flat and compact state; and further, in order to cope with the discontinuous adhesion of the powder output caused by the narrow and long shape of the powder outlet, a powder sparse component is provided, and the comb tooth power mechanism drives the comb tooth plate to stir back and forth in the powder storage tank, thereby improving the fluidity of the powder in the powder storage tank, and can break up the powder solidified into blocks in the tank to avoid internal adhesion and blockage. In summary, the design of the above structure can effectively solve the technical problems of poor powder spreading uniformity and obvious restrictions on the powder state of the existing droplet jet 3D printing equipment.

[0007] As a preferred solution, it also includes a quantitative output component, which includes a quantitative roller located at a preset position below the powder outlet and a first rotating drive mechanism drivingly connected to the quantitative roller, the axial direction of the quantitative roller is parallel to the length direction of the powder outlet, and the outer peripheral surface of the quantitative roller has a plurality of roller groove structures evenly distributed along the circumferential direction, and the quantitative roller is driven to rotate around the axis at a preset speed by the first rotating drive mechanism to continuously scatter powder scattered from the upper powder outlet to the roller groove structure to the powder bed below.

[0008] The design provides an optimization for uniform output of powder. The design uses a rotating metering roller to scatter powder instead of direct output from the powder outlet. The shape and structure of the metering roller matches the shape of the powder outlet. It is located a certain distance directly below the powder outlet. Multiple groove-shaped roller groove structures are evenly distributed on it. The powder first falls into the roller groove structure on the surface of the metering roller through the powder outlet. During the rotation of the metering roller, due to the constant rotation speed, the powder in the roller groove structure can be ensured to fall into the powder bed below at a relatively uniform rate.

[0009] As a preferred solution, it also includes a powder falling anti-sticking component, which includes a brush roller arranged parallel to the metering roller and a second rotating drive mechanism drivingly connected to the brush roller, the outer peripheral surface of the brush roller is evenly distributed with a bristle structure, the spacing between the brush roller and the metering roller is matched with the vertical length of the bristle structure, and the brush roller is driven to rotate around the axis at a preset speed by the second rotating drive mechanism to brush the powder on the surface of the metering roller to the powder bed below.

[0010] Based on the structure of a metering roller arranged below the powder storage tank in the above design, in order to prevent uneven powder falling caused by adhesion of powder to the roller groove structure surface of the metering roller, a parallel brush roller is arranged on one side of the metering roller, and bristles are arranged on the roller surface. During the rotation of the brush roller, the bristle structure continuously comes into frictional contact with the surface of the metering roller, thereby continuously brushing off the adhered powder from the surface of the metering roller, further ensuring uniform and continuous powder falling.

[0011] As a preferred solution, the surface of the comb plate is parallel to the powder outlet, the bottom of the comb plate is provided with a comb-tooth structure, and the two ends of the top of the comb plate are provided with side connecting rods, which are overlapped with the edge of the powder storage tank through the side connecting rods, and the side connecting rods are connected to the comb power mechanism by transmission. This design further optimizes the powder sparseness component, wherein the bottom of the comb plate has a comb-tooth structure suitable for stirring and does not hinder the passage of powder, and the two ends of the comb plate are overlapped with the edge of the powder storage tank through the side connecting rods, and this matching method is convenient for power transmission.

[0012] As a preferred solution, the comb tooth power mechanism includes two groups of pneumatic motors or electric motors respectively arranged at the two ends of the mounting beam, and the output end of each group of pneumatic motors or electric motors is connected to a transmission gear set structure. This design optimizes the comb tooth power mechanism, and the preferred power source is an electric motor or a pneumatic motor. Both designs have the advantage of convenient drive control, and the transmission gear set structure is arranged to ensure that the feed motion output by the power source meets the requirements of the reciprocating drive action.

[0013] As a preferred solution, the comb tooth power mechanism is two groups of pneumatic motors, which are connected by an air pipeline to move synchronously. The air pipeline connecting the two groups of pneumatic motors passes through the hollow space in the mounting beam, and the mounting beam is provided with a control valve for controlling the on-off of the air pipeline. In this design, the comb tooth power mechanism is a pneumatic motor, and the two groups of pneumatic motors are controlled by the same group of control valves to output motion synchronously, and the air pipes of the two groups of pneumatic motors are hidden inside the mounting beam, which can provide effective protection for the air pipes and improve the durability of the device.

[0014] As a preferred solution, the vibration power mechanism includes an output motor and a vibration transmission shaft, the output end of the output motor is connected to an eccentric cam, and the vibration transmission shaft is connected to the eccentric cam to transmit the vibration generated by the rotation of the eccentric cam to the vibration scraper. This design provides a preferred vibration power mechanism design, which outputs rotational power through the output motor, generates vibration through the rotation of the eccentric cam, and transmits the generated vibration to the entire vibration scraper via the vibration transmission shaft, ensuring that the vibration scraper performs vibration action at each position thereon to ensure uniform spreading of the powder.

[0015] As a preferred solution, the vibration power mechanism also includes a scraper mounting rod parallel to the vibration conduction shaft, the vibration scraper is fixed to the bottom end of the scraper mounting rod, the top end of the scraper mounting rod is connected to the bottom of the powder storage tank through an elastic connector, and a plurality of shaft seat structures are arranged on the scraper mounting rod at preset intervals, and the vibration conduction shaft is passed through each of the shaft seat structures.

[0016] This design is an optimized structure for the above-mentioned vibration output structure. In order to make the vibrating scraper more easily vibrate synchronously with the vibration conduction shaft, a scraper mounting rod is provided, which is installed and connected to the bottom of the powder storage tank through an elastic connector, replacing the rigid connection with an elastic connection to ensure that the structure is suitable for vibration action. The scraper mounting rod and the vibration conduction shaft are matched through a shaft seat structure to take into account both the transmission of vibration and the protection of the shaft structure with a longer length, so as to ensure the durability of the device.

[0017] As a preferred solution, the mounting beam is equipped with a photoelectric detection component, the detection end of which is opposite to the upper surface of the powder bed of the droplet jet 3D printing device, and is used to detect the flatness of the powder on the surface of the powder bed after the powder is spread. This design can automatically check the flatness of the powder bed surface after the powder is spread through the photoelectric detection component, and can use the detected situation for situation prompts or further for feedback control, and perform secondary powder spreading on the locations where the surface conditions do not meet the standards.

[0018] As a preferred solution, both ends of the mounting beam are provided with sliding pallet structures for cooperating with corresponding positions of the droplet jet 3D printing device, and the sliding pallet structure is provided with a feed drive mechanism for driving the powder spreading device to move in a straight line above the powder bed of the droplet jet 3D printing device. The drive mechanism is controlled and connected to a central control module, and the central control module is signal-connected to the photoelectric detection component for controlling the feed motion output of the drive mechanism according to the detection signal fed back by the photoelectric detection component.

[0019] This design further optimizes the automated control of the above-mentioned design capable of photoelectrically detecting the surface of the powder bed. A driving mechanism for controlling the overall translational sliding of the powder spreading device is set on the mounting beam, and the signal is connected to the photoelectric detection component through the central control module. The detection signal fed back by the photoelectric detection component commands the driving mechanism to output the driving force, so that secondary powder spreading can be performed on the positions where the detected flatness does not meet the actual requirements. In this way, the intelligence and automation of the device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic side view of a powder spreading device for a droplet jet 3D printing device provided by the present invention; Figure 2 A schematic diagram of the overall external structure of a powder spreading device for a droplet jet 3D printing device provided by the present invention; Figure 3 for Figure 2 A schematic diagram of the back structure of a powder spreading device for a droplet jet 3D printing device; Figure 4 for Figure 3 A schematic diagram of the partial structure of a powder spreading device for a droplet jet 3D printing device; Figure 5 for Figure 2 A schematic diagram of the partial structure of a powder spreading device for a droplet jet 3D printing device; in, Figure 1-Figure 5 middle: 1. Mounting beam; 2. Vibration assembly; 2-1. Output motor; 2-2. Vibration scraper; 2-3. Vibration transmission shaft; 2-4. Shaft seat structure; 2-5. Scraper mounting rod; 2-6. Elastic connector; 3. Powder storage tank; 3-1. Powder outlet; 4. Powder sparseness assembly; 4-1. Comb plate; 4-2. Comb power mechanism; 4-3. Control valve; 4-4. Side connecting rod; 5. Powder falling and anti-sticking assembly; 5-1. Brush roller; 5-2. Brush structure; 5-3. Second rotary drive mechanism; 6. Quantitative output assembly; 6-1. Quantitative roller; 6-2. First rotary drive mechanism; 6-3. Roller groove structure; 7. Sliding support plate structure. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] Before explaining the working principle of the present invention in detail, the description of the present invention needs to be further explained: In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a welding connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] refer to Figure 1-Figure 5 The following embodiments are described, Figure 1 A schematic side view of a powder spreading device for a droplet jet 3D printing device provided by the present invention; Figure 2 A schematic diagram of the overall external structure of a powder spreading device for a droplet jet 3D printing device provided by the present invention; Figure 3 for Figure 2 A schematic diagram of the back structure of a powder spreading device for a droplet jet 3D printing device; Figure 4 for Figure 3 A schematic diagram of the partial structure of a powder spreading device for a droplet jet 3D printing device; Figure 5 for Figure 2 Schematic diagram of the partial structure of the powder spreading device used in the droplet jet 3D printing equipment.

[0025] The embodiment of the present invention provides a powder spreading device for a droplet jet 3D printing device, comprising a mounting beam 1 and a powder storage tank 3 installed on one side of the mounting beam 1 for temporarily storing the powder to be spread, the bottom of the powder storage tank 3 is provided with a long strip powder outlet 3-1, the mounting beam 1 is also equipped with a vibration component 2, the vibration component 2 includes a vibration power mechanism fixed to the mounting beam 1 and a vibration scraper 2-2 connected to the vibration power mechanism, the vibration scraper 2-2 is located below the powder outlet 3-1, and is used to vibrate the powder to spread the powder. The powder material that has been laid on the surface of the powder bed below is evenly dispersed; the powder spreading device for droplet jet 3D printing equipment also includes a powder sparse component 4, which includes a comb plate 4-1 located in the powder storage tank 3 and a comb power mechanism 4-2 connected to the comb plate 4-1, and the comb power mechanism 4-2 is connected to the mounting beam 1. The comb power mechanism 4-2 outputs reciprocating motion to drive the comb plate 4-1 to stir reciprocally in the powder storage tank 3, which is used to loosen the powder material in the powder storage tank 3 to ensure the powder falling out of the powder outlet 3-1.

[0026] The powder spreading device for droplet jet 3D printing equipment provided by the present invention optimizes the structure and principle of the existing powder spreading device. The main structure includes a powder storage tank 3 for temporarily storing and accommodating powder. The bottom of the powder storage tank 3 has a long strip powder outlet 3-1. First, the length of the powder outlet can adapt to the width of the powder bed of the 3D printing equipment. Second, the narrow and long outlet can avoid accumulation of excessive powder in a local area. In order to assist the powder outlet and make the distribution of powder on the powder bed more uniform and flat, a vibration component 2 is provided. The vibration action output drives the vibration scraper 2-2 located at a certain distance from the upper surface of the powder bed to vibrate, so that The powder laid through the powder outlet 3-1 is scraped and pressed to a flat and compact state; and further, in order to deal with the discontinuous adhesion of the powder output caused by the narrow and long shape of the powder outlet 3-1, a powder sparse component 4 is set, and the comb tooth power mechanism 4-2 drives the comb plate 4-1 to stir back and forth in the powder storage tank 3, so as to improve the fluidity of the powder in the powder storage tank 3, break up the powder solidified into blocks in the tank, and avoid adhesion and blockage inside. In summary, the design of the above structure can effectively solve the technical problems of the existing droplet jet 3D printing equipment with poor powder spreading uniformity and obvious restrictions on the powder state. In addition, the mounting beam 1 can be set on the moving guide rail mechanism of the main frame of the 3D printing equipment, providing a mounting position for other components of the powder spreading device while also being able to move left and right. The mounting beam 1 can be fine-tuned at a certain angle with a certain radial point as the rotation center relative to the main frame of the 3D printing equipment, so that the vibration scraper 2-2 forms a certain angle with the surface of the powder bed below, which is more conducive to the flattening of the powder.

[0027] The technical solution provided in this embodiment also includes a quantitative output component 6, which includes a quantitative roller 6-1 located at a preset position below the powder outlet 3-1 and a first rotating drive mechanism 6-2 drivingly connected to the quantitative roller 6-1. The axial direction of the quantitative roller 6-1 is parallel to the length direction of the powder outlet 3-1, and the outer peripheral surface of the quantitative roller 6-1 has a plurality of roller groove structures 6-3 evenly distributed along the circumferential direction. The quantitative roller 6-1 is driven to rotate around the axis at a preset speed by the first rotating drive mechanism 6-2, so that the powder scattered from the upper powder outlet 3-1 to the roller groove structure 6-3 is continuously scattered to the powder bed below.

[0028] The design provides an optimization for uniform output of powder. The design uses a rotating metering roller 6-1 to scatter powder to replace the direct output of the powder outlet 3-1. The shape and structure of the metering roller 6-1 match the shape of the powder outlet 3-1. The metering roller 6-1 is located a certain distance directly below the powder outlet 3-1, and a plurality of groove-shaped roller groove structures 6-3 are evenly distributed thereon. The powder first falls into the roller groove structure 6-3 on the surface of the metering roller 6-1 through the powder outlet 3-1. During the rotation of the metering roller 6-1, due to the constant rotation speed, the powder in the roller groove structure 6-3 can be ensured to fall into the powder bed below at a relatively uniform rate. The amount of powder and the density of powder can be adjusted by adjusting the rotation speed of the metering roller 6-1.

[0029] The technical solution provided in this embodiment also includes a powder falling anti-sticking component 5, which includes a brush roller 5-1 arranged parallel to the metering roller 6-1 and a second rotating drive mechanism 5-3 drivingly connected to the brush roller 5-1. The outer peripheral surface of the brush roller 5-1 is evenly distributed with a bristle structure 5-2. The spacing between the brush roller 5-1 and the metering roller 6-1 is matched with the vertical length of the bristle structure 5-2. The brush roller 5-1 is driven to rotate around the axis at a preset speed by the second rotating drive mechanism 5-3 to brush the powder on the surface of the metering roller 6-1 to the powder bed below.

[0030] On the basis of the structure that the quantitative roller 6-1 is arranged below the powder storage tank 3 in the above design, in order to prevent the powder from adhering to the surface of the roller groove structure 6-3 of the quantitative roller 6-1 and causing uneven powder falling, a parallel brush roller 5-1 is arranged on one side of the quantitative roller 6-1, and bristles are arranged on the roller surface. During the rotation of the brush roller 5-1, the bristle structure 5-2 is constantly in friction contact with the surface of the quantitative roller 6-1, thereby continuously brushing off the adhered powder from the surface of the quantitative roller 6-1, further ensuring the uniformity and continuity of the powder falling. In addition, it should be noted that the brush roller 5-1 and the quantitative roller 6-1 rotate in opposite directions relative to each other, and the second rotary drive mechanism 5-3 can be an independently arranged power source or can be connected to the first rotary drive mechanism 6-2 through a transmission structure, and the transmission and reversing of rotation are implemented through structures such as gears. The material of the bristle structure 5-2 can be nylon, stainless steel, silicone, chicken wing wood, animal hair, etc.

[0031] In the technical solution provided in this embodiment, the surface of the comb plate 4-1 is parallel to the powder outlet 3-1, the bottom of the comb plate 4-1 is provided with a comb-tooth structure, and the two ends of the top of the comb plate 4-1 are provided with side connecting rods 4-4, which overlap with the edge of the powder storage tank 3 through the side connecting rods 4-4, and the side connecting rods 4-4 are connected to the comb power mechanism 4-2 in a transmission manner. This design further optimizes the powder sparse component 4, wherein the bottom of the comb plate 4-1 has a comb-tooth structure suitable for stirring and does not hinder the passage of powder, and the two ends of the comb plate 4-1 overlap with the edge of the powder storage tank 3 through the side connecting rods 4-4, and this matching method is convenient for power transmission.

[0032] In the technical solution provided in this embodiment, the comb tooth power mechanism 4-2 includes two groups of pneumatic motors or electric motors respectively arranged at the two ends of the mounting beam frame 1, and the output end of each group of pneumatic motors or electric motors is connected to a transmission gear set structure. This design optimizes the comb tooth power mechanism 4-2, and the preferred power source is an electric motor or a pneumatic motor. Both designs have the advantage of convenient drive control, and the transmission gear set structure is set to ensure that the feed motion output by the power source is suitable for the requirements of the reciprocating drive action.

[0033] In the technical solution provided in this embodiment, the comb tooth power mechanism 4-2 is two groups of pneumatic motors, which are connected by an air pipeline to move synchronously. The air pipeline connecting the two groups of pneumatic motors passes through the hollow space in the mounting beam 1, and a control valve 4-3 for controlling the on-off of the air pipeline is provided on the mounting beam 1. In this design, the comb tooth power mechanism 4-2 is a pneumatic motor, and the two groups of pneumatic motors are controlled by the same group of control valves 4-3 to synchronously output motion, and the air pipes of the two groups of pneumatic motors are hidden inside the mounting beam 1, which can provide effective protection for the air pipes and improve the durability of the device.

[0034] In the technical solution provided in this embodiment, the vibration power mechanism includes an output motor 2-1 and a vibration transmission shaft 2-3. The output end of the output motor 2-1 is connected to an eccentric cam. The vibration transmission shaft 2-3 is connected to the eccentric cam to transmit the vibration generated by the rotation of the eccentric cam to the vibration scraper 2-2. This design provides a preferred vibration power mechanism design, which outputs rotational power through the output motor 2-1, generates vibration through the rotation of the eccentric cam, and transmits the generated vibration to the entire vibration scraper 2-2 via the vibration transmission shaft 2-3, ensuring that the vibration scraper 2-2 performs vibration action at all positions thereon to ensure uniform spreading of the powder. In addition, the vibration power mechanism can also adopt designs such as pneumatic vibrators and ultrasonic vibrations. In this embodiment, only the way in which the vibration motor cooperates with the eccentric cam is described in detail.

[0035] In the technical solution provided in this embodiment, the vibration power mechanism also includes a scraper mounting rod 2-5 parallel to the vibration conduction shaft 2-3, the vibration scraper 2-2 is fixed to the bottom end of the scraper mounting rod 2-5, the top end of the scraper mounting rod 2-5 is connected to the bottom of the powder storage tank 3 through an elastic connector 2-6, and a plurality of shaft seat structures 2-4 are arranged on the scraper mounting rod 2-5 at preset intervals, and the vibration conduction shaft 2-3 is inserted into each shaft seat structure 2-4.

[0036] This design is an optimized structure for the above-mentioned vibration output structure. In order to make the vibrating scraper 2-2 more easily vibrate synchronously with the vibration conduction shaft 2-3, a scraper mounting rod 2-5 is provided, which is installed and connected to the bottom of the powder storage tank 3 through an elastic connecting piece 2-6, and an elastic connection replaces a rigid connection to ensure that the structure is suitable for vibration action. The scraper mounting rod 2-5 and the vibration conduction shaft 2-3 are matched through the shaft seat structure 2-4 to take into account both the transmission of vibration and the protection of the shaft structure with a longer length, so as to ensure the durability of the device.

[0037] In the technical solution provided in this embodiment, the mounting beam 1 is installed with a photoelectric detection component, and the detection end of the photoelectric detection component is opposite to the upper surface of the powder bed of the droplet jet 3D printing device, which is used to detect the flatness of the powder on the surface of the powder bed after the powder is spread. This design can automatically check the flatness of the surface of the powder bed that has been spread through the photoelectric detection component, and can use the detected situation for situation prompts or further for feedback control, and perform secondary powder spreading on the position where the surface condition does not meet the standard.

[0038] In the technical solution provided in this embodiment, both ends of the mounting beam 1 are provided with sliding pallet structures 7 for cooperating with the corresponding positions of the droplet jet 3D printing device. The sliding pallet structure 7 is provided with a feed drive mechanism for driving the powder spreading device to move in a straight line above the powder bed of the droplet jet 3D printing device. The drive mechanism control is connected to a central control module, and the central control module is connected to the photoelectric detection component signal for controlling the feed motion output of the drive mechanism according to the detection signal fed back by the photoelectric detection component.

[0039] This design further optimizes the automated control for the above-mentioned design capable of photoelectrically detecting the surface of the powder bed. A driving mechanism for controlling the overall translational sliding of the powder spreading device is set on the mounting beam 1, and the signal is connected to the photoelectric detection component through the central control module. The detection signal fed back by the photoelectric detection component commands the driving mechanism to output the driving force, so that secondary powder spreading can be performed on the positions where the detected flatness does not meet the actual requirements. In this way, the intelligent automation of the device operation can be improved.

[0040] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A powder spreading device for a droplet jet 3D printing device, characterized in that: The invention comprises a mounting beam (1) and a powder storage tank (3) mounted on one side of the mounting beam (1) for temporarily storing powder to be laid, wherein a long strip-shaped powder outlet (3-1) is arranged at the bottom of the powder storage tank (3), and the mounting beam (1) is also mounted with a vibration assembly (2), wherein the vibration assembly (2) comprises a vibration power mechanism fixed to the mounting beam (1) and a vibration scraper (2-2) connected to the vibration power mechanism, wherein the vibration scraper (2-2) is located below the powder outlet (3-1) and is used to evenly disperse the powder laid on the surface of the powder bed below by vibration. The powder spreading device for droplet jetting 3D printing equipment further comprises a powder sparse component (4), the powder sparse component (4) comprising a comb plate (4-1) located in the powder storage tank (3) and a comb power mechanism (4-2) connected to the comb plate (4-1), the comb power mechanism (4-2) being connected to the mounting beam frame (1), and the comb plate (4-1) is driven to stir reciprocatingly in the powder storage tank (3) by outputting a reciprocating motion through the comb power mechanism (4-2), so as to loosen the powder in the powder storage tank (3) to ensure that the powder falls out of the powder outlet (3-1).

2. The powder spreading device for a droplet jet 3D printing device according to claim 1, characterized in that: The invention also comprises a quantitative output component (6), the quantitative output component (6) comprising a quantitative roller (6-1) located at a preset position below the powder outlet (3-1) and a first rotary drive mechanism (6-2) drivingly connected to the quantitative roller (6-1), the axial direction of the quantitative roller (6-1) being parallel to the length direction of the powder outlet (3-1), the outer peripheral surface of the quantitative roller (6-1) being uniformly distributed with a plurality of roller groove structures (6-3) along the circumferential direction, the quantitative roller (6-1) being driven to rotate around the axis at a preset speed by the first rotary drive mechanism (6-2), so as to continuously scatter powder material scattered from the upper powder outlet (3-1) to the roller groove structures (6-3) to the powder bed below.

3. The powder spreading device for a droplet jet 3D printing device according to claim 1, characterized in that: The invention also comprises a powder falling anti-adhesion component (5), the powder falling anti-adhesion component (5) comprising a brush roller (5-1) arranged parallel to the metering roller (6-1) and a second rotary drive mechanism (5-3) drivingly connected to the brush roller (5-1), the outer peripheral surface of the brush roller (5-1) being evenly distributed with a brush structure (5-2), the spacing between the brush roller (5-1) and the metering roller (6-1) being matched with the vertical length of the brush structure (5-2), and the brush roller (5-1) being driven to rotate around the axis at a preset speed by the second rotary drive mechanism (5-3) so as to brush the powder on the surface of the metering roller (6-1) to the powder bed below.

4. The powder spreading device for a droplet jet 3D printing device according to claim 1, characterized in that: The surface of the comb plate (4-1) is parallel to the powder outlet (3-1); a comb-tooth structure is provided at the bottom of the comb plate (4-1); side connecting rods (4-4) are provided at both ends of the top of the comb plate (4-1); the side connecting rods (4-4) are overlapped with the edge of the powder storage tank (3); and the side connecting rods (4-4) are transmission-connected to the comb power mechanism (4-2).

5. The powder spreading device for droplet jetting 3D printing equipment according to claim 4, characterized in that: The comb tooth power mechanism (4-2) comprises two groups of pneumatic motors or electric motors respectively arranged at two ends of the mounting beam frame (1), and the output end of each group of pneumatic motors or electric motors is connected to a transmission gear set structure.

6. The powder spreading device for a droplet jet 3D printing device according to claim 5, characterized in that: The comb tooth power mechanism (4-2) is two groups of pneumatic motors, which are connected by an air pipeline to move synchronously. The air pipeline connecting the two groups of pneumatic motors passes through the hollow space in the mounting beam (1). The mounting beam (1) is provided with a control valve (4-3) for controlling the on-off of the air pipeline.

7. The powder spreading device for a droplet jet 3D printing device according to claim 1, characterized in that: The vibration power mechanism comprises an output motor (2-1) and a vibration transmission shaft (2-3); the output end of the output motor (2-1) is connected to an eccentric cam; the vibration transmission shaft (2-3) is connected to the eccentric cam to transmit vibration generated by the rotation of the eccentric cam to the vibration scraper (2-2).

8. The powder spreading device for a droplet jet 3D printing device according to claim 7, characterized in that: The vibration power mechanism also includes a scraper mounting rod (2-5) parallel to the vibration conduction shaft (2-3); the vibration scraper (2-2) is fixedly mounted on the bottom end of the scraper mounting rod (2-5); the top end of the scraper mounting rod (2-5) is connected to the bottom of the powder storage tank (3) via an elastic connector (2-6); a plurality of shaft seat structures (2-4) are arranged on the scraper mounting rod (2-5) at preset intervals; the vibration conduction shaft (2-3) is inserted into each of the shaft seat structures (2-4).

9. The powder spreading device for a droplet jet 3D printing device according to claim 1, characterized in that: The mounting beam (1) is equipped with a photoelectric detection component, the detection end of the photoelectric detection component is opposite to the upper surface of the powder bed of the droplet jet 3D printing device, and is used to detect the flatness of the powder on the surface of the powder bed after the powder is spread.

10. The powder spreading device for a droplet jet 3D printing device according to claim 9, characterized in that: Both ends of the mounting beam (1) are provided with a sliding support plate structure (7) for cooperating with corresponding positions of the droplet jet 3D printing device. The sliding support plate structure (7) is provided with a feeding drive mechanism for driving the powder spreading device to move linearly above the powder bed of the droplet jet 3D printing device. The driving mechanism is controlled and connected to a central control module. The central control module is signal-connected to the photoelectric detection component and is used to control the feeding motion output of the driving mechanism according to the detection signal fed back by the photoelectric detection component.

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