CN118663473A - 3D prints spraying device - Google Patents

Abstract

The present invention relates to the technical field of 3D printing workpiece spraying, specifically a 3D printing spraying device, including a spray gun and a transmission assembly, a workpiece spraying-assisting mechanism installed on the spray gun, two protective mechanisms arranged on both sides of the workpiece spraying-assisting mechanism, and a workpiece clamping mechanism installed in the protective mechanism, wherein the transmission assembly is installed on one of the protective mechanisms. By arranging a sealed workpiece spraying-assisting mechanism at the nozzle of the spray gun, when the part of the workpiece that needs to be sprayed is located inside the workpiece spraying-assisting mechanism, the rotation-assisting assembly will drive the workpiece to rotate in a circle along the nozzle of the spray gun, and the workpiece in a sealed environment can be fully sprayed. During this period, the workpiece is regularly inspected by the workpiece clamping mechanism, and when the workpiece spraying part is detected by the wet mold gauge and meets the specified thickness, the workpiece can be taken out, thereby ensuring that the thickness of the workpiece spraying can be sprayed in distinct layers.

Description

A 3D printing spraying device

Technical Field

The invention relates to the technical field of 3D printing workpiece spray painting, and in particular to a 3D printing spraying device.

Background Art

3D printing, also known as additive manufacturing or layered manufacturing, is a technology that uses digital model files as the basis and uses adhesive materials such as powdered metal or plastic to construct objects by printing layer by layer. The finished workpiece also needs to undergo a spraying process to achieve the most perfect texture of the workpiece.

At present, the spraying process of workpieces made by 3D printing is mainly divided into manual coloring, spray painting, dip dyeing, electroplating and nano-spraying. Among them, the spray painting process has the lowest cost and the highest efficiency. At the same time, the thickness of the spray paint determines the overall layering and beauty of the workpiece. However, this spray painting method cannot measure the paint thickness on the workpiece surface in time.

In view of the above, the present invention designs a 3D printing spraying device to solve the above problems.

Summary of the invention

The present invention aims to solve one of the technical problems existing in the prior art or related technology.

To this end, the technical solution adopted in the present invention is:

A 3D printing spraying device, comprising a spray gun and a transmission assembly, a workpiece spraying-assisting mechanism installed on the spray gun, two protection mechanisms arranged on both sides of the workpiece spraying-assisting mechanism, and a workpiece clamping mechanism installed in the protection mechanism, wherein the transmission assembly is installed on one of the protection mechanisms;

The workpiece spray-assisting mechanism comprises an annular cover, a cleaning liquid pipeline installed on the annular cover, a sewage discharge end installed at the bottom of the annular cover, and a rotation-assisting assembly arranged in the annular cover;

The spray gun has a spray head that penetrates into the inner cavity of the ring cover and is used to spray paint on the workpiece;

The protection mechanism comprises two outer bins installed at both ends of the ring cover, the top of the outer bin is provided with a rectangular sleeve, and a wet mold gauge for measuring the paint thickness is movably installed in the rectangular sleeve;

The transmission assembly is used to transmit the rotation-assisting assembly to provide kinetic energy for the workpiece to assist in circular rotation;

The workpiece clamping mechanism comprises a sealing cover installed at the outer end of the outer bin, the inner end of the sealing cover is provided with a slideway inclined in four directions, a slide block and a fastening blade installed outside the slide block are arranged in the slideway.

In a preferred example, the present invention can be further configured as follows: the workpiece spray-assisting mechanism also includes two sets of shaft clamps fixedly mounted on the top of the ring cover, two sleeves mounted in the outer notches of the ring cover, a sealing pad mounted at one end of the inner side of the sleeve, and a paint-blocking pad mounted at the other end of the inner side of the sleeve;

The paint retaining pad and the sealing pad are both made of rubber material;

The sheath is made of stainless steel.

In a preferred example, the present invention can be further configured as follows: the rotation-assisting assembly includes two protective gaskets, a ring gear mounted on the outside of the protective gaskets, a partition mounted on the inside of the protective gaskets, and a brush roller movably mounted in two adjacent partitions;

The ring gear is provided with ring teeth on its exterior, and a ring protrusion is provided on a side of the ring gear away from the ring cover;

The brush roller is composed of a beam rod and a cotton roller.

In a preferred example, the present invention can be further configured as follows: the inner walls at both ends of the ring cover are provided with raised retaining rings, and the bottom of the partition is provided with a groove adapted to the retaining ring.

In a preferred example, the present invention can be further configured as follows: the protection mechanism further includes a clamp seat fixedly mounted on the outer end of the outer bin, a snap button movably mounted in the clamp seat, and a spring connected to the inner groove of the snap button, and the other end of the spring is fixed on the outer bin;

The inner end of the outer bin is provided with an inwardly recessed annular groove, and the annular protrusion is adapted to penetrate into the annular groove.

In a preferred example, the present invention can be further configured as follows: the protection mechanism further includes four positioning members;

The positioning member is in a U-shaped structure as a whole, and fastening bolts are arranged in two end plates at both ends of the positioning member.

In a preferred example, the present invention can be further configured as follows: the transmission assembly also includes two sets of motor clamps, motors installed in the two sets of motor clamps, a shaft installed on the transmission shaft in the motor, and two gear plates installed on the shaft.

In a preferred example, the present invention may be further configured as follows: the gear plate is adapted to mesh with the ring teeth outside the ring gear.

In a preferred example, the present invention can be further configured as follows: the workpiece clamping mechanism also includes a pad installed on the inner end of the sealing cover and adapted to be clamped on the slider, a limiter installed in the slideway, and a compression spring arranged outside the limiter, and the limiter is adapted to pass through the interior of the slider.

In a preferred example, the present invention can be further configured as follows: the fastening blade is made of thickened plastic, and evenly distributed liquid-repellent grooves are opened inside the fastening blade.

By adopting the above technical solution, the beneficial effects achieved by the present invention are as follows:

1. The present invention provides a sealed workpiece spray-assisting mechanism at the nozzle of the spray gun. When the part of the workpiece that needs to be painted is located inside the workpiece spray-assisting mechanism, the rotation-assisting component will drive the workpiece to rotate in a circle along the nozzle of the spray gun. At this time, the workpiece in a sealed environment can be fully sprayed. During this period, the workpiece is regularly inspected by the workpiece clamping mechanism. When the painted part of the workpiece passes the detection of the wet mold gauge and meets the specified thickness, the workpiece can be taken out, thereby ensuring that the paint thickness of the workpiece can be sprayed in distinct layers.

2. The present invention arranges a rotation-assisting assembly inside the ring cover. When the rotation-assisting assembly is driven, the brush roller rotates along the inner wall of the ring cover. When the workpiece is being painted, the rotation of the brush roller can prevent the suspended paint liquid from repeatedly dripping onto the surface of the workpiece, and can also cooperate with the subsequent cleaning liquid to clean the inside of the ring cover, thereby not interfering with the subsequent painting process of the workpiece.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the present invention when in use;

FIG2 is a bottom view schematic diagram of the present invention;

FIG3 is a schematic diagram of the protection mechanism and the transmission assembly of the present invention;

FIG4 is a schematic diagram of a dispersed protection mechanism of the present invention;

FIG5 is an enlarged schematic diagram of point A in FIG4 of the present invention;

FIG6 is a partial schematic diagram of a workpiece clamping mechanism of the present invention;

FIG7 is an enlarged schematic diagram of point B in FIG6 of the present invention;

FIG8 is a schematic diagram of a workpiece spray-assisting mechanism of the present invention;

FIG9 is a schematic diagram of a dispersed workpiece spraying aid mechanism of the present invention;

FIG. 10 is a schematic diagram of the dispersion of the rotation-assisting components of the present invention.

Reference numerals:

100, workpiece spraying mechanism; 110, ring cover; 120, shaft fixture; 130, sheath; 140, paint blocking pad; 150, sealing pad; 160, cleaning liquid pipeline; 170, sewage discharge end; 180, rotation-assisting assembly; 181, protective pad ring; 182, ring gear; 183, partition; 184, brush roller;

200, spray gun;

300, protective mechanism; 310, outer compartment; 320, wet mold gauge; 330, clamping seat; 340, snap button; 350, spring; 360, positioning member;

400, transmission assembly; 410, motor fixture; 420, motor; 430, shaft; 440, gear plate;

500, workpiece clamping mechanism; 510, sealing cover; 520, pad; 530, limiter; 540, compression spring; 550, slider; 560, fastening blade.

DETAILED DESCRIPTION

To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

A 3D printing spraying device provided by some embodiments of the present invention is described below in conjunction with the accompanying drawings.

Embodiment 1:

As shown in Figures 1 to 10, a 3D printing spraying device provided by the present invention includes a spray gun 200 and a transmission assembly 400, a workpiece spray-assisting mechanism 100 installed on the spray gun 200, two protection mechanisms 300 arranged on both sides of the workpiece spray-assisting mechanism 100, and a workpiece clamping mechanism 500 installed in the protection mechanism 300, and the transmission assembly 400 is installed on one of the protection mechanisms 300.

The workpiece spray-assisting mechanism 100 includes a ring cover 110, a shaft clamp 120, a sleeve 130, a paint-blocking pad 140, a sealing pad 150, a cleaning liquid pipeline 160, a sewage discharge end 170 and an auxiliary rotation assembly 180, and the auxiliary rotation assembly 180 also includes a protective gasket 181, a ring gear 182, a partition 183 and a brush roller 184. The protective mechanism 300 includes an outer bin 310, a wet mold gauge 320, a clamp seat 330, a snap 340, a spring 350 and a positioning member 360. The transmission assembly 400 includes a motor clamp 410, a motor 420, a shaft 430 and two gear plates 440. The workpiece clamping mechanism 500 includes a sealing cover 510, a pad 520, a limit member 530, a compression spring 540, a slider 550 and a fastening blade 560.

The workpiece spraying aid mechanism 100 includes an annular cover 110, a cleaning liquid pipeline 160 installed on the annular cover 110, a sewage discharge end 170 installed at the bottom of the annular cover 110, and a rotation-aiding assembly 180 disposed in the annular cover 110;

The spray head of the spray gun 200 penetrates into the inner cavity of the ring cover 110 and is used to spray paint on the workpiece;

The protection mechanism 300 includes two outer bins 310 installed at both ends of the ring cover 110. A rectangular sleeve is provided on the top of the outer bin 310. A wet gauge 320 for measuring the paint thickness is movably installed in the rectangular sleeve.

The transmission assembly 400 is used to transmit the rotation-assisting assembly 180 to provide kinetic energy for the workpiece to rotate in a circular direction;

The workpiece clamping mechanism 500 includes a sealing cover 510 installed at the outer end of the outer bin 310 , and an inner end of the sealing cover 510 is provided with four inclined slideways, in which a slider 550 and a fastening blade 560 installed outside the slider 550 are arranged.

Nowadays, 3D workpieces need to be painted after they are manufactured. However, when such workpieces are painted with handheld spray guns or automatic spray guns, the paint thickness on the workpiece surface is difficult to detect in real time. The circumferential spraying of the workpiece and the layers of paint thickness cannot be distinguished. Therefore, the beauty of the workpiece after spraying is not clear enough, and the paint consumption is large.

Before using the device, one of the sealing covers 510 needs to be stretched outward until the four fastening blades 560 are withdrawn from the inner cavity of the outer chamber 310, and then the workpiece to be painted is placed on the inner side of the four fastening blades 560. After one end of the workpiece is clamped, the sealing cover 510 and the four fastening blades 560 can be reinserted into the inner cavity of the outer chamber 310 until the exposed end of the workpiece is immersed in the inner cavity of the ring cover 110. At this time, the workpiece can be suspended in the center of the inner cavity of the ring cover 110. When the spray gun 200 draws paint in and sprays it toward the inner cavity of the ring cover 110, the workpiece suspended along the center of the inner cavity of the ring cover 110 can be painted. As the motor 420 is started, its internal transmission shaft drives the shaft 430. And two gear plates 440, and the two ring gears 182 can be assisted to rotate synchronously. At this time, the workpiece can be assisted to rotate in the center by the two protective gaskets 181, and the four elastically contracted fastening blades 560 will not interfere with the rotation of the workpiece and avoid a large amount of paint waste. At the same time, the brush roller 184 driven by the two protective gaskets 181 can scrape off the paint accumulated on the inner wall of the ring cover 110. At this time, the paint accumulated on the inner wall of the ring cover 110 will not interfere with the painting of the workpiece. When the workpiece is taken out and the cleaning liquid is sprayed from the cleaning liquid pipeline 160 to the inner cavity of the ring cover 110, the continuously rotating brush roller 184 can clean the inner wall of the ring cover 110, thereby providing a clean environment for subsequent workpieces.

Embodiment 2:

As shown in FIG8-FIG10, on the basis of the first embodiment, the workpiece spraying assisting mechanism 100 further includes two sets of shaft clamps 120 fixedly mounted on the top of the ring cover 110, two sleeves 130 mounted in the outer notches of the ring cover 110, a sealing gasket 150 mounted on one end of the inner side of the sleeve 130, and a paint blocking pad 140 mounted on the other end of the inner side of the sleeve 130;

The paint retaining pad 140 and the sealing pad 150 are both made of rubber material;

The sheath 130 is made of stainless steel;

The rotation-assisting assembly 180 includes two protective gaskets 181 , a ring gear 182 mounted on the outside of the protective gaskets 181 , a partition 183 mounted on the inside of the protective gaskets 181 , and a brush roller 184 movably mounted in two adjacent partitions 183 ;

The ring gear 182 is provided with ring teeth on its exterior, and a ring protrusion is provided on a side of the ring gear 182 away from the ring cover 110;

The brush roller 184 is composed of a beam and a cotton roller;

The inner walls at both ends of the ring cover 110 are provided with protruding material blocking rings, and the bottom of the partition plate 183 is provided with a groove adapted to the material blocking ring.

Use bolts to fix the two ring gears 182 on the outside of the two protective gasket rings 181 respectively. At this time, the two protective gasket rings 181 will fit the inner walls at both ends of the ring cover 110. As the two ring gears 182 are synchronously driven, the two protective gasket rings 181 can drive the partition 183 and the brush roller 184 to rotate at a uniform speed. At this time, the two partitions 183 fit the two retaining rings on the inner wall of the ring cover 110 and rotate, which can prevent the paint from clogging the inner cavity of the ring cover 110, and the scraped paint will enter the sewage discharge end 170 and finally be discharged outward from the sewage discharge end 170.

Embodiment 3:

As shown in FIGS. 3 to 7 , based on the first embodiment, the protection mechanism 300 further includes four positioning members 360 , a clamping seat 330 fixedly mounted on the outer end of the outer bin 310 , a snap button 340 movably mounted in the clamping seat 330 , and a spring 350 connected to the inner groove of the snap button 340 , and the other end of the spring 350 is fixed on the outer bin 310 ;

The inner end of the outer bin 310 is provided with an inwardly recessed annular groove, and the annular protrusion is adapted to penetrate into the annular groove;

The positioning member 360 is in a U-shaped structure as a whole, and fastening bolts are arranged in two end plates at both ends of the positioning member 360;

The workpiece clamping mechanism 500 further includes a backing plate 520 installed at the inner end of the sealing cover 510 and adapted to be clamped on the slider 550, a stopper 530 installed in the slideway, and a compression spring 540 arranged outside the stopper 530, and the stopper 530 is adapted to penetrate the interior of the slider 550;

The fastening blade 560 is made of thickened plastic, and evenly distributed liquid-repellent grooves are formed inside the fastening blade 560 .

A rectangular sleeve is opened on the top of the outer bin 310, and a pre-tightening bolt is movably installed in the column head on one side of the rectangular sleeve. Then, the height of the wet gauge 320 extending into the inner cavity of the outer bin 310 is adjusted, and the pre-tightening bolt is rotated until the wet gauge 320 is fixed. At this time, the end of the wet gauge 320 that penetrates into the inner cavity of the outer bin 310 can fit with the surface of the workpiece. When the clamped workpiece is rotated in the center and sprayed directly by the spray gun 200, the rotating workpiece can be sprayed with paint, and the paint thickness can be detected in real time by using the wet gauge 320 after the distance adjustment, so that the workpiece can be sprayed with paint in layers.

Embodiment 4:

As shown in Figures 3 to 10 , based on the first embodiment, the transmission assembly 400 includes two sets of motor clamps 410 installed on one of the outer bins 310, a motor 420 installed in the two sets of motor clamps 410, a shaft 430 installed on the transmission shaft in the motor 420, and two gear plates 440 installed on the shaft 430.

The gear plate 440 is adapted to mesh with the ring teeth on the outside of the ring gear 182;

Two sets of motor clamps 410 are fixedly installed on the top of one of the outer bins 310, and the motor 420 is fixedly installed inside the two sets of motor clamps 410, and two sets of shaft clamps 120 are used to provide stable support force for the shaft 430. When the motor 420 is started, its internal transmission shaft will drive the shaft 430, and then the two driven gear plates 440 can drive the two ring gears 182 at the same time. At this time, the brush roller 184 with bidirectional pressure can pressurize and scrape the paint to improve the cleaning efficiency of the paint accumulated on the inner wall of the ring cover 110.

The working principle and use process of the present invention are as follows: two partitions 183 are fixedly installed on two protective gasket rings 181 by bolts, and the brush roller 184 is movably installed in two adjacent partitions 183. At this time, the brush roller 184 will fit the inner wall of the ring cover 110, and the cleaning liquid pipeline 160 is connected to the outside with a water pipe. The water pipe is in a closed state during the painting operation, and the two sets of shaft clamps 120 fixedly installed on the top of the ring cover 110 will provide a stable bearing capacity for the shaft rod 430, and the protective gasket ring 181 is installed on the ring gear 182 by bolts, and the protective gasket ring 181 is adapted to fit In the inner wall of the ring cover 110, the two sets of auxiliary rotation components 180 symmetrically distributed at both ends of the ring cover 110 can be meshed and driven by the two gear plates 440, and the nozzle of the spray gun 200 penetrates into the inner cavity of the two sheaths 130, and the two paint blocking pads 140 and the two sealing pads 150 respectively installed in the two sheaths 130 will clamp the outer wall of the spray gun 200. At this time, the spray gun 200 nozzle will be separated from the inner cavity of the ring cover 110. When the injection pipe at the bottom of the spray gun 200 sucks the paint, and under the pressure of the air pipe at the outer end of the spray gun 200, the nozzle of the spray gun 200 that penetrates into the inner cavity of the ring cover 110 can The workpiece located in the middle of the two protective gasket rings 181 is subjected to the painting operation. When the motor 420 is started and running, its internal transmission shaft will drive the shaft 430 to rotate, and the two gear plates 440 will simultaneously drive the two ring gears 182. At this time, the workpiece placed inside the two protective gasket rings 181 can be assisted in rotation. After the part of the workpiece to be painted is fully sprayed, by pressing two of the snaps 340 and then stretching one of the sealing covers 510 outward, the four fastening blades 560 are restrained on the workpiece. As the fastening blades 560 are withdrawn from the inner cavity of the outer bin 310, The wet mold gauge 320 constrained by bolts in the rectangular sleeve at the top of the outer bin 310 can be attached to the surface of the workpiece. When the painted part of the workpiece passes the bottom end of the wet mold gauge 320, the wet mold gauge 320 in the height adjustment can measure the thickness of the paint on the painted part of the workpiece, and the four evenly distributed fastening blades 560 are in an elastic support state. When the workpiece is assisted in rotation by the two protective pad rings 181, the multiple fastening blades 560 arranged at both ends of the workpiece can provide centering and leveling for the rotation of the workpiece. At this time, the part of the workpiece to be painted can be unobstructed, and the paint thickness of the workpiece can be conveniently inspected and observed.

When the device is finished painting, the cleaning liquid can be injected into the inner cavity of the ring cover 110 through a water pipe, and the two rotating protective pad rings 181 will cooperate with the two partitions 183 and a brush roller 184 to roll and brush along the inner wall of the ring cover 110. With the flushing of the cleaning liquid, the paint layer being rolled and brushed can be cleaned before it dries. At the same time, the brush roller 184 rotating during the painting of the workpiece can prevent the suspended paint liquid from dripping onto the surface of the workpiece.

Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. A 3D printing spraying device, comprising a spray gun (200) and a transmission assembly (400), characterized in that it also comprises a workpiece spraying-assisting mechanism (100) mounted on the spray gun (200), two protection mechanisms (300) arranged on both sides of the workpiece spraying-assisting mechanism (100), and a workpiece clamping mechanism (500) installed in the protection mechanism (300), wherein the transmission assembly (400) is mounted on one of the protection mechanisms (300); The workpiece spray-assisting mechanism (100) comprises an annular cover (110), a cleaning liquid pipeline (160) installed on the annular cover (110), a sewage discharge end (170) installed at the bottom of the annular cover (110), and a rotation-assisting assembly (180) arranged in the annular cover (110); The spray head of the spray gun (200) penetrates into the inner cavity of the ring cover (110) and is used to spray paint on the workpiece; The protection mechanism (300) comprises two outer bins (310) mounted at two ends of the ring cover (110), a rectangular sleeve is provided on the top of the outer bin (310), and a wet gauge (320) for measuring the paint thickness is movably mounted in the rectangular sleeve; The transmission assembly (400) is used to transmit the rotation-assisting assembly (180) to provide kinetic energy for the workpiece to assist in circular rotation; The workpiece clamping mechanism (500) comprises a sealing cover (510) mounted on the outer end of an outer bin (310), the inner end of the sealing cover (510) is provided with four inclined slideways, a slider (550) and a fastening blade (560) mounted on the outside of the slider (550) are arranged in the slideway. 2. A 3D printing spraying device according to claim 1, characterized in that the workpiece spraying assisting mechanism (100) further comprises two sets of shaft clamps (120) fixedly mounted on the top of the ring cover (110), two sleeves (130) mounted in the outer notches of the ring cover (110), a sealing gasket (150) mounted on one end of the inner side of the sleeve (130), and a paint blocking gasket (140) mounted on the other end of the inner side of the sleeve (130); The paint blocking pad (140) and the sealing pad (150) are both made of rubber material; The sheath (130) is made of stainless steel. 3. A 3D printing spraying device according to claim 1, characterized in that the rotation-assisting assembly (180) comprises two protective gasket rings (181), a ring gear (182) installed outside the protective gasket rings (181), a partition (183) installed inside the protective gasket rings (181), and a brush roller (184) movably installed in two adjacent partitions (183); The ring gear (182) is provided with ring teeth on its exterior, and a ring protrusion is provided on a side of the ring gear (182) away from the ring cover (110); The brush roller (184) is composed of a beam rod and a cotton roller. 4. A 3D printing spraying device according to claim 3, characterized in that the inner walls at both ends of the ring cover (110) are provided with raised retaining rings, and the bottom of the partition (183) is provided with a groove adapted to the retaining ring. 5. A 3D printing spraying device according to claim 1, characterized in that the protection mechanism (300) further comprises a clamping seat (330) fixedly mounted on the outer end of the outer bin (310), a snap button (340) movably mounted in the clamping seat (330), and a spring (350) connected to an inner groove of the snap button (340), and the other end of the spring (350) is fixed on the outer bin (310); An inwardly recessed annular groove is formed at the inner end of the outer bin (310), and the annular protrusion is adapted to penetrate into the annular groove. 6. The 3D printing spraying device according to claim 1, characterized in that the protection mechanism (300) further comprises four positioning members (360); The positioning member (360) is in a U-shaped structure as a whole, and fastening bolts are arranged in two end plates at both ends of the positioning member (360). 7. A 3D printing spraying device according to claim 1, characterized in that the transmission assembly (400) further comprises two sets of motor clamps (410), a motor (420) installed in the two sets of motor clamps (410), a shaft (430) installed on a transmission shaft in the motor (420), and two gear plates (440) installed on the shaft (430). 8. A 3D printing spraying device according to claim 3, characterized in that the gear plate (440) is adapted to mesh with the ring teeth outside the ring gear (182). 9. A 3D printing spraying device according to claim 1, characterized in that the workpiece clamping mechanism (500) further includes a pad (520) installed on the inner end of the sealing cover (510) and adapted to be clamped on the slider (550), a limiter (530) installed in the slideway, and a compression spring (540) arranged outside the limiter (530), and the limiter (530) is adapted to pass through the interior of the slider (550). 10. A 3D printing spraying device according to claim 1, characterized in that the fastening blade (560) is made of thickened plastic, and evenly distributed liquid-repelling grooves are opened inside the fastening blade (560).