A 3D printer material discharging device

Abstract

The present invention relates to the technical field of 3D printing. The present invention discloses a 3D printer material discharging device, which includes a hot bed. A glass substrate is laid on the surface of the hot bed. Sliding mechanisms are arranged on both sides of the glass substrate. An L-shaped material discharger is slidably connected to the sliding mechanisms. The L-shaped material discharger includes a sliding rod and a liquid spraying support rod. Linear distributed liquid spray heads are arranged on the surface of the liquid spraying support rod. The liquid sprayed by the liquid spray heads is alcohol. A stop angle is arranged between the sliding rod and the liquid spraying support rod. The angle change of the sliding rod and the liquid spraying support rod is cleverly used as a parameter for starting alcohol spraying. When the liquid spraying support rod is tilted, the liquid spraying support rod can spray alcohol at the contact between the end face of the workpiece and the glass substrate and at the contact between the side face of the workpiece and the glass substrate. Until the workpiece is separated from the glass substrate, the sliding mechanism controls the L-shaped material discharger to reset, thereby providing a structural basis for subsequent automatic material discharging.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and specifically to a 3D printer material discharging device. Background Art

[0002] The main printing material of an FDM 3D printer is PETG, and glass is used as a substrate when printing PETG material. The PETG material adheres firmly to the glass. When the temperature of the hot bed drops, it is still very difficult for the workpiece to separate from the glass substrate.

[0003] To solve this problem, many people will choose multiple glass substrates. After the hot bed cools down, the glass substrate is removed and slowly cooled until the workpiece is easy to fall off. This method has a fast processing speed, but requires multiple glass substrates.

[0004] Secondly, alcohol is sprayed on the PETG to make the PETG naturally demold from the glass substrate. This method is fast, but currently mainly through manual spraying. After spraying, the PETG makes a crackling sound, and the bottom surface of the PETG gradually separates from the hot bed. The form of manual spraying cannot achieve automated continuous processing. To solve the problem that the PETG and the glass substrate cannot achieve automated continuous rapid processing, a 3D printer material discharging device is designed. Summary of the Invention

[0005] The purpose of the present invention is to provide a 3D printer material discharging device, which cleverly uses the angle change of the sliding rod and the liquid spraying support rod as the parameter for starting alcohol spraying. When the liquid spraying support rod is tilted, the liquid spraying support rod can spray alcohol on the contact area between the end face of the workpiece and the glass substrate and the contact area between the side face of the workpiece and the glass substrate to assist demolding, so as to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A 3D printer material discharging device includes a hot bed, a glass substrate is laid on the surface of the hot bed, sliding mechanisms are arranged on both sides of the glass substrate, an L-shaped material discharger is slidably connected to the sliding mechanisms, the L-shaped material discharger includes a sliding rod and a liquid spraying support rod, linear distributed liquid nozzles are arranged on the surface of the liquid spraying support rod, and the liquid sprayed by the liquid nozzles is alcohol;

[0008] The liquid spraying support rod is rotationally connected to the sliding rod through a torsion spring rotating assembly, and a stop angle is arranged between the sliding rod and the liquid spraying support rod;

[0009] When the angle between the sliding rod and the sliding mechanism is equal to the stop angle, the sliding mechanism stops working, and the liquid nozzles form an inclined spraying surface, and alcohol is sprayed on the end face and the side face of the workpiece.

[0010] As a further solution of the present invention: A contact disk is rotatably connected to the top surface of the end of the liquid spraying support rod away from the sliding rod. The diameter of the contact disk is larger than the width of the liquid spraying support rod, and a buffer is attached to the circumferential side of the contact disk.

[0011] As a further solution of the present invention: A contact stop rod is fixedly connected to the surface of the liquid spraying support rod. The contact stop rod is located above the liquid spray head. Due to the contact between the contact stop rod and the workpiece, the liquid spray head cannot contact the workpiece, and the surface of the contact stop rod is smooth.

[0012] As a further solution of the present invention: A trigger assembly is provided at the movable part of the liquid spraying support rod and the sliding rod. The trigger assembly includes a trigger pin fixedly connected to the top of the liquid spraying support rod and a contact switch fixedly connected to the side of the sliding rod.

[0013] As a further solution of the present invention: The included angle between the liquid spraying support rod and the sliding rod is the stop angle. The trigger pin controls the contact switch to turn on. The contact switch is signal-connected to an external controller, and the external controller controls the start and stop of the sliding mechanism and the start and stop of the liquid supply device of the liquid spray head.

[0014] As a further solution of the present invention: A scraping rod is fixedly connected below the liquid spraying support rod. One end of the scraping rod is flush with the end of the liquid spraying support rod close to the contact disk.

[0015] As a further solution of the present invention: The total length of the two scraping rods is greater than the width of the glass substrate.

[0016] As a further solution of the present invention, the contact disk is detachably connected to the liquid spraying support rod. There are multiple contact disks with different diameter specifications, and the maximum included angle between the sliding rod and the liquid spraying support rod is 90 degrees.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The structure of this technical solution is simple. It cleverly uses the angle change of the sliding rod and the liquid spraying support rod as the parameter for starting alcohol spraying. When the liquid spraying support rod is tilted, the liquid spraying support rod can spray alcohol on the contact area between the end face of the workpiece and the glass substrate and the contact area between the side face and the glass substrate. After the workpiece is separated from the glass substrate, the torsion spring at the rotation part of the sliding rod and the liquid spraying support rod undergoes elastic reset. The included angle between the sliding rod and the liquid spraying support rod is not within the stop angle range. The sliding mechanism continues to work, and the sliding rod pushes the workpiece to move until the workpiece is separated from the glass substrate. Then the sliding mechanism controls the L-shaped blanking device to reset, thereby providing a structural basis for subsequent automatic blanking.

[0019] After the workpiece is pushed away from the glass substrate, the sliding rod and the liquid spraying support rod return to their original positions. The maximum angle between the sliding rod and the liquid spraying support rod is 90 degrees. During the reset process, the two liquid spraying support rods are horizontal, and the two contact blocking rods form a complete scraping surface to scrape the glass substrate. Alcohol is removed from the surface of the glass substrate, and at the same time, dirt can also be cleaned. This can avoid the situation of unstable adhesion of the workpiece caused by dirt. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the use state of a 3D printer unloading device;

[0022] Figure 2 It is a schematic diagram before the use of a 3D printer unloading device;

[0023] Figure 3 It is Figure 2 a top view schematic diagram;

[0024] Figure 4 It is Figure 1 a top view schematic diagram;

[0025] Figure 5 It is a three-dimensional schematic diagram of a liquid spraying support rod in a 3D printer unloading device;

[0026] Figure 6 It is a three-dimensional schematic diagram of a liquid spraying support rod in a 3D printer unloading device from another perspective;

[0027] Figure 7 It is a schematic diagram of the pushing in a 3D printer unloading device;

[0028] Figure 8 It is a rear view schematic diagram of a 3D printer unloading device;

[0029] In the figure: 100, hot bed; 200, glass substrate; 300, stop angle; 1, sliding mechanism; 2, sliding rod; 3, liquid spraying support rod; 4, contact blocking rod; 5, liquid spray head; 6, contact disk; 7, trigger assembly; 71, trigger pin; 72, contact switch; 8, scraping rod. Detailed Embodiments

[0030] Please refer to Figures 1-8 : Embodiment 1:

[0031] The problem to be solved in this embodiment is how to spray alcohol according to the adhesion between the workpiece and the glass substrate 200 after the hot bed 100 cools down. And how the alcohol should be sprayed. To solve this problem, the following improvements are made:

[0032] In this embodiment, it includes a hot bed 100. A glass substrate 200 is laid on the surface of the hot bed 100. Sliding mechanisms 1 are arranged on both sides of the glass substrate 200. An L-shaped blanking device is slidably connected to the sliding mechanisms 1. The L-shaped blanking device includes a sliding rod 2 and a liquid spraying support rod 3. Liquid nozzles 5 are linearly distributed on the surface of the liquid spraying support rod 3. The liquid sprayed by the liquid nozzles 5 is alcohol. The liquid spraying support rod 3 is rotationally connected to the sliding rod 2 through a torsion spring rotating assembly. A stop angle 300 is provided between the sliding rod 2 and the liquid spraying support rod 3. When the angle between the sliding rod 2 and the sliding mechanism 1 is equal to the stop angle 300, the sliding mechanism 1 stops working, and the liquid nozzles 5 form an inclined spraying surface, and the alcohol is sprayed on the end face and the side face of the workpiece.

[0033] Improvement principle: Generally, a 3D printer prints an object at the center of the glass substrate 200. Workpieces of different volumes will have different contact areas with the glass substrate 200. Sliding mechanisms 1 are arranged on both sides of the glass substrate 200. The sliding mechanisms 1 can use a lead screw transmission mechanism to control the movement of the L-shaped blanking device. Two L-shaped blanking devices form a U-shaped pushing structure. The two liquid spraying support rods 3 are in contact with each other, and the sum of the lengths of the two liquid spraying support rods 3 is greater than the width of the glass substrate 200.

[0034] Please refer to Figure 1 , when the adhesion between the workpiece and the glass substrate 200 is large, the sliding rod 2 moves under the influence of the sliding mechanism 1, the liquid spraying support rod 3 contacts the workpiece, and an angle will be formed between the liquid spraying support rod 3 and the sliding rod 2. The specific value of the stop angle 300 needs to be determined according to the elastic coefficient of the torsion spring.

[0035] Please refer to Figure 4 , when the liquid spraying support rod 3 bends at an angle with the sliding rod 2, the liquid nozzles 5 are affected by the liquid spraying support rod 3, and the spraying surface of the liquid nozzles 5 is aligned with the corner of the side wall of the workpiece. Taking the stop angle 300 as an index, when the included angle between the sliding rod 2 and the liquid spraying support rod 3 reaches the stop angle 300, it is determined that this workpiece needs auxiliary alcohol spraying. The alcohol sprayed by the liquid spraying support rod 3 at the stop angle 300 is located on the contact end face, two side faces of the workpiece, and even the alcohol will be sprayed on the subsequent sliding surface of the workpiece. In this way, the alcohol can be sprayed at the angle between the workpiece and the glass substrate 200, and the workpiece will be quickly affected by the alcohol to separate the bonding surface of the workpiece from the glass substrate 200.

[0036] Please refer to Figure 7After the workpiece is separated from the glass substrate 200, the torsion springs at the rotation points of the sliding rod 2 and the liquid spraying support rod 3 are elastically reset. The included angle between the sliding rod 2 and the liquid spraying support rod 3 is not within the stop angle range of 300. The sliding mechanism 1 continues to work, and the sliding rod 2 pushes the workpiece to move. Until the workpiece is separated from the glass substrate 200, the sliding mechanism 1 controls the L-shaped stripper to reset.

[0037] Improvement effect: The structure of this technical solution is simple. It cleverly uses the angle change of the sliding rod 2 and the liquid spraying support rod 3 as the parameter for starting alcohol spraying. And when the liquid spraying support rod 3 is tilted, the liquid spraying support rod 3 can spray alcohol on the contact area between the end face of the workpiece and the glass substrate 200 and the contact area between the side face of the workpiece and the glass substrate 200. Although one side is not affected by alcohol spraying, only one side is not sprayed. In the case of separation of the other three sides, the adhesion friction is greatly reduced. When the workpiece is in a state of rapid temperature change, it also has a promoting effect on the separation of the non-alcohol side. Therefore, spraying on three sides will not affect the separation of the workpiece from the glass substrate 200.

[0038] Embodiment 2. On the basis of Embodiment 1, in order to solve the problem of wear at the corner of the workpiece when it contacts the liquid spraying support rod 3, the following structure is set:

[0039] In this embodiment: A contact disk 6 is rotatably connected to the top surface of the end of the liquid spraying support rod 3 away from the sliding rod 2. The diameter of the contact disk 6 is larger than the width of the liquid spraying support rod 3. A buffer is attached to the circumferential side of the contact disk 6. The contact disk 6 is detachably connected to the liquid spraying support rod 3, and there are multiple contact disks 6 with different diameter specifications.

[0040] Please refer to Figure 1 , the diameter of the contact disk 6 is larger than the width of the liquid spraying support rod 3. The contact disk 6 contacts the side surface of the workpiece, and a distance is generated between the liquid spraying support rod 3 and the side surface of the workpiece. Please refer to Figure 4 , the liquid spraying support rod 3 and the sliding rod 2 are bent. During the displacement of the sliding rod 2, the liquid spraying support rod 3 rotates around the contact disk 6. The distance generated between the liquid spraying support rod 3 and the side surface of the workpiece ensures that the liquid spraying support rod 3 will not contact the corner of the workpiece, and the liquid spraying support rod 3 can still maintain an inclined posture. When the workpiece is separated from the glass substrate 200, the torsion spring pushes the liquid spraying support rod 3 to reset, and the contact disk 6 contacts the side wall of the workpiece, and the contact disk 6 will rotate. Thus, the problem of damage to the side wall of the workpiece caused by sliding friction between the liquid spraying support rod 3 and the workpiece is avoided.

[0041] Furthermore, please refer to Figure 4 , a distance is generated between the liquid spraying support rod 3 and the side surface of the workpiece. There is a distance between the liquid nozzle 5 and the corner of the workpiece. The nozzle closest to the corner of the workpiece still has a certain diffusion area, improving the spraying effect.

[0042] Furthermore, contact disks 6 and liquid spraying support rods 3 of corresponding sizes are selected for installation according to the size of the workpiece. However, during the installation process, it should be noted that the distance between the two contact disks 6 needs to be adjusted according to the diameter of the contact disks 6 themselves. Therefore, multiple connection sites, such as holes, inserts, etc., can be provided above the liquid spraying support rods 3.

[0043] Furthermore, for the distance between the contact disk 6 and the workpiece, as the distance between the contact disk 6 and the workpiece increases, the force received by the contact disk 6 will be affected by the force arm, resulting in an increase in the torque generated on the rotating end of the liquid spraying support rod 3, and the liquid spraying support rod 3 is more likely to deform. At the same time, the contact influence on the workpiece is reduced.

[0044] Buffering substances such as sponge, silica gel, rubber, etc. can be provided on the circumferential side of the contact disk 6 to reduce the influence of the contact disk 6 on the contact surface of the workpiece.

[0045] Embodiment 3. Embodiment 2 solves the contact problem between the workpiece corner and the liquid spraying support rod 3. However, if the width of the workpiece is large, the inclination angle at which the liquid spraying support rod 3 does not contact the workpiece corner is small. The spraying effect of the liquid spraying support rod 3 on the side wall of the workpiece is not good, and if the side wall of the workpiece has a longer length, the influence of the liquid ejected by the liquid nozzle 5 on the distal end of the side wall of the workpiece is small. To solve the above problems, the following improvements are provided:

[0046] In this embodiment, a contact stop rod 4 is fixedly connected to the surface of the liquid spraying support rod 3. The contact stop rod 4 is located above the liquid nozzle 5. Due to the contact between the contact stop rod 4 and the workpiece, the liquid nozzle 5 cannot contact the workpiece, and the surface of the contact stop rod 4 is smooth.

[0047] In this embodiment, the liquid nozzle 5 is arranged on the outside of the liquid spraying support rod 3, and a contact stop rod 4 is arranged on the side wall of the liquid spraying support rod 3. The contact stop rod 4 is located above the liquid nozzle 5. In the case of a wider workpiece, the distance provided by the contact disk 6 for the liquid spraying support rod 3 is not sufficient to enable the liquid spraying support rod 3 to reach the stop angle of 300°. Therefore, in order to enable the liquid spraying support rod 3 to reach the stop angle of 300°, the contact stop rod 4 contacts the corner of the workpiece. The contact stop rod 4 ensures that the liquid nozzle 5 does not contact the corner of the workpiece. At the same time, the contact stop rod 4 may also have a sliding problem with the corner. Therefore, the surface of the contact stop rod 4 is smooth, and the material of the contact stop rod 4 can also be selected as rubber or silica gel and other materials. A Teflon film is attached to the surface of the rubber or silica gel to reduce the friction force.

[0048] Embodiment 4: In order to achieve alcohol spraying when the angle between the sliding rod 2 and the liquid spraying support rod 3 reaches the stop angle of 300°, the following structure is provided:

[0049] In this embodiment, a trigger assembly 7 is provided at the movable connection between the liquid spraying support rod 3 and the sliding rod 2. The trigger assembly 7 includes a trigger pin 71 fixedly connected to the top of the liquid spraying support rod 3 and a contact switch 72 fixedly connected to the side of the sliding rod 2. The included angle between the liquid spraying support rod 3 and the sliding rod 2 is the stop angle 300. The trigger pin 71 controls the contact switch 72 to turn on. The contact switch 72 is signal-connected to an external controller, and the external controller controls the start and stop of the sliding mechanism 1 and the start and stop of the liquid supply device of the liquid spray head 5.

[0050] When the sliding rod 2 and the liquid spraying support rod 3 change in angle, the trigger pin 71 moves toward the contact switch 72 side. When the included angle between the sliding rod 2 and the liquid spraying support rod 3 is the stop angle 300, the trigger pin 71 contacts the contact switch 72, and the trigger pin 71 triggers the contact switch 72 to turn on. The contact switch 72 can be a switch for controlling the closing of the sliding mechanism 1, and at the same time, the contact switch 72 is also a switch for controlling the start of the external liquid supply device of the liquid spray head 5. In this way, the step of tilting and statically spraying alcohol on the sliding rod 2 and the liquid spraying support rod 3 can be realized. Compared with the control method combining an angle sensor and a control system, this structure is simpler.

[0051] Embodiment Five: To solve the problem of alcohol residue and the surface cleaning problem of the glass substrate 200, the following structure is provided:

[0052] A scraping rod 8 is fixedly connected below the liquid spraying support rod 3. One end of the scraping rod 8 is flush with one end of the liquid spraying support rod 3 close to the contact disc 6. The total length of the two scraping rods 8 is greater than the width of the glass substrate 200. The maximum included angle between the sliding rod 2 and the liquid spraying support rod 3 is 90 degrees.

[0053] Please refer to Figure 8 , the two liquid spraying support rods 3 are in contact with each other, and the two scraping rods 8 are in contact with each other. The width of the two scraping rods 8 after splicing is greater than the width of the glass substrate 200. The purpose is to ensure that when the liquid spraying support rod 3 is tilted, the scraping rod 8 can still contact the glass substrate 200. At this time, a problem may occur. There is a gap between the two scraping rods 8, and the gap causes a water channel to be generated.

[0054] After the workpiece is pushed away from the glass substrate 200, the sliding rod 2 and the liquid spraying support rod 3 are reset. The maximum included angle between the sliding rod 2 and the liquid spraying support rod 3 is 90 degrees. During the reset process, the two liquid spraying support rods 3 are horizontal, and the two contact blocking rods 4 form a complete scraping surface to scrape the glass substrate 200. The alcohol is removed from the surface of the glass substrate 200, and at the same time, the dirt can also be cleaned.

[0055] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A 3D printer material discharging device, comprising a hot bed (100), a glass substrate (200) is laid on the surface of the hot bed (100), and sliding mechanisms (1) are arranged on both sides of the glass substrate (200), characterized in that: An L-shaped stripping device is slidably connected to the sliding mechanism (1). The L-shaped stripping device includes a sliding rod (2) and a liquid spraying support rod (3). The surface of the liquid spraying support rod (3) is provided with liquid spray nozzles (5) distributed linearly, and the liquid sprayed by the liquid spray nozzles (5) is alcohol; The liquid spraying support rod (3) is rotatably connected to the sliding rod (2) through a torsion spring rotating assembly, and a stop angle (300) is provided between the sliding rod (2) and the liquid spraying support rod (3); When the included angle between the sliding rod (2) and the sliding mechanism (1) is equal to the stop angle (300), the sliding mechanism (1) stops working, and the liquid spray nozzles (5) form an inclined spraying surface, and the alcohol is sprayed on the end face and the side face of the workpiece; A contact disk (6) is rotatably connected to the top surface of the end of the liquid spraying support rod (3) away from the sliding rod (2). The diameter of the contact disk (6) is larger than the width of the liquid spraying support rod (3), and a buffer is attached to the circumferential side of the contact disk (6); A trigger assembly (7) is provided at the movable part between the liquid spraying support rod (3) and the sliding rod (2). The trigger assembly (7) includes a trigger pin (71) fixedly connected to the top of the liquid spraying support rod (3) and a contact switch (72) fixedly connected to the side surface of the sliding rod (2); When the included angle between the liquid spraying support rod (3) and the sliding rod (2) is the stop angle (300), the trigger pin (71) controls the contact switch (72) to turn on. The contact switch (72) is signal-connected to an external controller, and the external controller controls the start and stop of the sliding mechanism (1) and the start and stop of the liquid supply device of the liquid spray nozzles (5).

2. The 3D printer material discharging device according to claim 1, wherein: A contact stop rod (4) is fixedly connected to the surface of the liquid spraying support rod (3). The contact stop rod (4) is located above the liquid spray nozzles (5). Affected by the contact between the contact stop rod (4) and the workpiece, the liquid spray nozzles (5) cannot contact the workpiece, and the surface of the contact stop rod (4) is smooth.

3. The 3D printer material discharging device according to claim 1, characterized in that: A scraping rod (8) is fixedly connected to the lower part of the liquid spraying support rod (3). One end of the scraping rod (8) is flush with the end of the liquid spraying support rod (3) close to the contact disk (6).

4. The 3D printer material discharging device according to claim 3, wherein: The total length of the two scraping rods (8) is greater than the width of the glass substrate (200).

5. A 3D printer material discharging device according to claim 1, characterized in that: The contact disk (6) is detachably connected to the liquid spraying support rod (3). There are multiple contact disks (6) with different diameter specifications, and the maximum included angle between the sliding rod (2) and the liquid spraying support rod (3) is 90 degrees.

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