CN108327040B

CN108327040B - 3D printing head, using method thereof and glue applied to 3D printing head

Info

Publication number: CN108327040B
Application number: CN201810120064.3A
Authority: CN
Inventors: 黄天成; 李彬; 顾海; 张捷; 曹赛男; 姜杰; 孙健华
Original assignee: NANTONG INSTITUTE OF TECHNOLOGY
Current assignee: NANTONG INSTITUTE OF TECHNOLOGY
Priority date: 2018-02-06
Filing date: 2018-02-06
Publication date: 2020-05-15
Anticipated expiration: 2038-02-06
Also published as: CN108327040A

Abstract

The application provides a 3D printing head, which comprises a charging barrel, a caliber telescopic device and a glue outlet device; the lower end of the charging barrel is provided with a discharging hole; the caliber telescopic device is provided with a movable baffle plate; the glue discharging device is arranged around the periphery of the charging barrel, and the lower end of the glue discharging device is provided with a glue discharging hole; the invention also provides a using method of the printing head, which applies force on the caliber telescopic device to form a new discharging hole again; the printing material in the charging barrel is extruded from a new discharging hole, and the peripheral surface is stained with glue solution; the application also provides the above-mentioned glue that beats on the printer head, and the printing material is the concrete, and glue includes following component: softening oil, asphalt, rubber, reinforced fiber, diatomite and a stabilizer. The three-dimensional printing head has the advantages that the caliber expansion device is arranged on the 3D printing head, the section of the discharging hole capable of discharging materials is reduced, and materials with small sections can be extruded; meanwhile, a glue outlet device is additionally arranged, a glue outlet hole is formed in the discharge hole, and after the printing material is extruded from the discharge hole, glue solution can be adhered to the surface of the printing material, so that the printing material can be conveniently bonded on the next step.

Description

3D printing head, using method thereof and glue applied to 3D printing head

Technical Field

The application relates to the technical field of 3D printing, in particular to a 3D printing head, an application method thereof and glue applied to the printing head.

Background

The 3D printing technology is a method for manufacturing solid parts by stacking materials layer by layer based on three-dimensional model data. The method subverts the traditional production idea, does not need mechanical processing or a die, does not depend on whether the traditional production process can be realized, and greatly shortens the research and development period of the product. The technology is widely applied to the fields of machinery, automobiles, education, medical treatment, building industry, national defense and the like, and remarkable economic benefit is obtained.

The 3D printer still is in the middle of the continuous research and development, 3D printing technique is towards the pluralism of printing material and the development of the off-the-shelf quality optimization direction of printing, wherein, prior art's 3D printer beats printer head and is usually for being a discharge opening, from this discharge opening blowout printing material, pile up layer upon layer again, form required product, but among the prior art 3D prints the specification one of discharge opening and all is fixed, its spun printing material's cross-section size is fixed, tiny part is difficult to machine-shaping in the part, the material adhesion nature of tiny cross-section printing material is poor again, the fastness between layer can not be guaranteed.

Therefore, how to develop and improve the above-mentioned shortcomings of the prior art is the objective of the related industry, and the present application is proposed by the designer of the present application based on the idea of creation and design with years of experience, through many studies and trials of sample tests, and many modifications and improvements.

Disclosure of Invention

Technical problem to be solved

In view of the above technical problems, the present application provides a 3D printing head that can extrude a fine cross section and ensure bonding firmness, a method for using the same, and a glue applied thereto.

(II) technical scheme

The application provides a 3D beats printer head, include

The charging barrel is used for containing printing materials, and the lower end of the charging barrel is provided with a discharge hole;

the caliber expansion device is provided with a plurality of movable blocking pieces arranged around the discharge hole of the charging barrel;

the glue outlet device is arranged around the charging barrel, and the lower end of the glue outlet device is provided with a glue outlet hole surrounding the discharge hole.

In some embodiments of the present application, the aperture expansion device is embedded in the wall of the material cylinder, and a cavity for embedding the blocking piece is opened in the wall of the material cylinder.

In some embodiments of the present application, the cavity is a smooth linear cavity having a cavity lower port extending to a discharge hole wall.

In some embodiments of the present application, the baffle extends along the cavity with a lower end thereof near the lower port of the cavity.

In some embodiments of the present application, the blocking piece has a driving portion thereon for driving the blocking piece to move in the direction of the cartridge, the driving portion is in contact with the upper end of the blocking piece through a wedge surface, and the wedge surface is inclined towards the inner wall of the cartridge.

In some embodiments of this application, separation blade upper end has the first inclined plane to the slope of feed cylinder inner wall, the drive division includes the ejector pad, the ejector pad is the annular design, corresponds one by one with being the separation blade that encircles the setting, have the second inclined plane with first inclined plane contact on the ejector pad, vertical direction's thrust or pulling force are applyed to the separation blade to the ejector pad.

In some embodiments of the present application, the driving portion further includes a push rod fixedly disposed on the push block, and an end portion of the push rod is fixed with a force application pad exposed outside the discharge cylinder.

The application also provides a use method of the 3D printing head, which comprises the following steps:

(1) applying force on the caliber expansion device to push the baffle plates to extend out to the center of the discharge hole, and reforming the bottoms of the baffle plates into new discharge holes smaller than the original discharge holes;

(2) the printing material in the charging barrel is extruded from the new discharging hole, the extruded material passes through the glue outlet hole, the peripheral side surface is stained with glue solution, and the extruded material is bonded with the previously extruded material through the glue solution.

The application also provides a glue that uses on above-mentioned 3D beats printer head, the printing material is the concrete, glue includes the component of following parts by weight:

the rubber comprises styrene-butadiene thermoplastic rubber, the reinforced fiber is glass fiber, the softening oil is mixed oil of aromatic oil and castor oil, and the ratio of the aromatic oil to the castor oil is 1: 1.5.

In some embodiments of the present application, the stabilizer is one or more of trioctyl phosphate and polyvinylpyrrolidone mixed in any ratio.

(III) advantageous effects

According to the technical scheme, the method has at least one of the following beneficial effects:

(1) the 3D printing head is provided with the caliber expansion device, and when the blocking pieces are driven to move towards the center of the discharging hole through a plurality of movable blocking pieces, the bottom ends of the blocking pieces are mutually connected, so that the section of the discharging hole, which can discharge materials, is reduced, the materials with small sections can be extruded, and the forming range is widened; meanwhile, a glue outlet device is additionally arranged, a glue outlet hole is also formed outside the discharge hole, and after the printing material is extruded from the discharge hole, glue solution can be adhered to the surface of the printing material, so that the next step of bonding is facilitated, the bonding firmness of the materials is enhanced, and the product quality is optimized;

(2) the driving part of the baffle skillfully utilizes the wedge-shaped block principle to convert the up-and-down movement into the movement of the baffle relative to the separation blade away from or close to the discharge hole;

(3) the caliber expansion device is embedded in the wall of the charging barrel, so that the installation space of the caliber expansion device is saved, the caliber expansion device is not easy to fall off, the bottom of the baffle plate can directly extend out of the wall of the discharging hole, and the positioning is more accurate;

(4) utilize the device can be very convenient print the architectural model, the strip concrete surface of extruding is comparatively bright and clean, is favorable to the cladding of glue on next step, and glue is semi-solid glue, has better adhesion, and glue has waterproof characteristic, and bonding property is good, and it is very firm to add slightly drying after printing the shaping.

Drawings

Fig. 1 is a schematic diagram of an embodiment of the present application.

Fig. 2 is a partially enlarged view of an embodiment of the present application.

Fig. 3 is a perspective view of the aperture expansion/contraction portion according to the embodiment of the present application.

Fig. 4 is a perspective view of a baffle plate according to an embodiment of the present application.

[ description of main reference numerals in the application ]

1. A motor; 2. A coupling; 3. Extruding a screw;

4. a charging barrel; 41. A discharge hole; 5. Glue;

6. a rubber cylinder; 61. A glue outlet hole; 7. A caliber expansion device;

71. a push block; 711. A second inclined plane; 712. A chute;

72. a baffle plate; 721. A first inclined plane; 722. A slide rail;

73. a wedge-shaped surface; 74. A push rod; 75. A connecting rod;

76. a force application pad; 8. Printing the material.

Detailed Description

The application provides a 3D printing head, a using method thereof and glue applied to the printing head. Whether the size of the discharge hole can be adjusted or not is convenient for more refined printing; after the printing material is extruded, a layer of glue is adhered to the surface of the printing material, so that the adhesive force between the printing layers is enhanced. In the printing of the building model, the printing precision and the bonding firmness of the building model are greatly improved by matching with the specially-made glue.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings in combination with specific embodiments.

Example one

In one exemplary embodiment of the present application, a 3D print head is provided. As shown in fig. 1, the present application includes a barrel 4, a caliber retracting device 7 and a glue discharging device.

The respective components of the present embodiment are described in detail below.

The printing head is a screw extrusion type printing head, an extruding screw 3 is driven by a motor 1 through a coupler 2, a printing material is arranged in a charging barrel 4, the charging barrel 4 is vertically arranged, the lower end of the charging barrel is provided with a discharging hole 41, and the printing material is extruded from the discharging hole 41 along with the rotation of the extruding screw 3.

As shown in fig. 2, the glue discharging device comprises a glue barrel 6 arranged around the material barrel in a surrounding manner, an annular glue storage cavity is formed between the glue barrel 6 and the material barrel 4, glue 5 is stored in the glue storage cavity, the lower end of the glue barrel 6 is positioned below the discharge hole 41, a glue discharging hole 61 surrounding the discharge hole 41 is formed between the glue discharging hole 41 and the glue discharging hole 61, the glue discharging hole 61 and the discharge hole 41 are coaxial and are arranged below the discharge hole 41 in a cylindrical surrounding manner, when the printing material 8 is extruded from the discharge hole 41, the printing material 8 must pass through the glue discharging hole 61, the glue 5 is uniformly coated on the printing material 8 in the process, and the bonding between layers of the printing material 8 is facilitated.

As shown in fig. 3 and 4, the bore expansion device 7 has a plurality of movable blocking pieces 72 arranged around the discharge opening 41 of the barrel 4, the movable blocking pieces 72 are adjacent to each other, and the adjacent parts are overlapped with each other, and the bottom ends of the blocking pieces 72 enclose a hole shape.

The caliber expansion device 7 is embedded in the wall of the charging barrel 4, a cavity for embedding the baffle plate 72 is arranged in the wall of the charging barrel 4, the cavity is a smooth linear cavity, a lower cavity port extending to the hole wall of the discharging hole 41 is provided, the baffle plate 72 is arranged along the cavity in an extending way, the lower end of the baffle plate is close to the lower cavity port, a driving part for driving the baffle plate 72 to move towards the charging barrel 4 is arranged on the baffle plate 72, the driving part is contacted with the upper end of the baffle plate 72 through a wedge-shaped surface 73, the wedge-shaped surface 73 inclines towards the inner wall of the charging barrel 4, when the driving part moves downwards, the baffle plate 72 can be driven to move towards the middle part of the discharging hole 41, all the baffle plates 72 move together, thereby the section of a small hole formed by the lower end part is reduced.

The upper end of the blocking piece 72 is provided with a first inclined surface 721 inclined towards the inner wall of the charging barrel 4, the driving part comprises a push block 71, the push block 71 is designed in an annular shape and corresponds to the surrounding stop blocks 72 one by one, the push block 71 is provided with a second inclined surface 711 contacted with the first inclined surface 721, and the push block 71 can apply vertical pushing force or pulling force to the blocking piece 72. The first inclined surface 721 and the second inclined surface 711 are also limited by a slide rail 722 and a slide groove 712, which have dovetail-shaped cross sections. The driving unit further includes a push rod 74 fixedly provided on the push block 71, and an urging pad 76 exposed to the outside of the cartridge 4 is fixed to an end of the push rod 74 through a link 75. When the discharging device is used, the force application pad 76 is pushed to slide downwards, the push rod 74 drives the push block 71 to slide downwards, the push block 71 extrudes the blocking piece 72, the blocking piece 72 is extruded to slide downwards along the linear cavity, the lower end of the blocking piece 72 extends out of the hole wall of the discharging hole 41, the lower ends of the blocking pieces 72 are combined with each other to form a small hole with a section smaller than that of the discharging hole 41, and the actual discharging section of the discharging hole 41 is reduced. The printing material 8 extruded from the discharging hole 41 must pass through the glue outlet 61, and the glue solution has viscosity, so that the glue solution cannot easily drop by itself, but can be easily adhered to the outer wall of the extruded material, and the extruded material can be used for processing more delicate products, and meanwhile, the adhesive force of the products is still good.

Example two

The printing material is concrete, and the glue comprises the following components in parts by weight: 8 parts of softening oil, 6 parts of asphalt, 10 parts of rubber, 2 parts of reinforced fiber, 3 parts of diatomite and 1 part of stabilizer. The rubber comprises styrene-butadiene thermoplastic rubber, the reinforced fiber is glass fiber, the softening oil is mixed oil of aromatic oil and castor oil in a ratio of 1:1, and the ratio of the aromatic oil to the castor oil is 1: 1.5. The stabilizer is trioctyl phosphate.

EXAMPLE III

Under the condition that other technical means are the same as those of the first embodiment, the glue comprises the following components in parts by weight: 9 parts of softening oil, 7 parts of asphalt, 11 parts of rubber, 3 parts of reinforced fiber, 4 parts of diatomite and 2 parts of stabilizer. The stabilizer is a mixture of trioctyl phosphate and polyvinylpyrrolidone in any ratio.

Example four

Under the condition that other technical means and embodiments are the same, the glue comprises the following components in parts by weight: 10 parts of softening oil, 8 parts of asphalt, 12 parts of rubber, 2.5 parts of reinforced fiber, 3.5 parts of diatomite and 1.5 parts of stabilizer. The stabilizer is a mixture of trioctyl phosphate and polyvinylpyrrolidone in any ratio.

After the glue was cured, the field pull test was performed with random spot placement on the printing models of examples one to three, and the field ambient temperature was 25 ℃. During testing, an AT-M type digital display drawing instrument is adopted to carry out on-site detection on the drawing strength of the printing model, a drawing head with the diameter of 20mm is bonded on the surface of the waterproof bonding layer by solvent-free epoxy glue, and detection is carried out according to the operation method of the drawing instrument specification after the solvent-free epoxy glue is cured. The test results are shown in table 1 below.

TABLE 1

Examples	First point/MP	Second point/MP	Third point/MP	average/MP
					Example two	1.56	1.35	1.71	1.54
EXAMPLE III	1.49	1.36	1.57	1.47
					Example four	1.55	1.39	1.45	1.46

The on-site drawing strength qualified rate is more than 90%, the drawing strength is averagely more than 1.45MP, the drawing strength difference of each point is not very large, and the uniformity is good.

Up to this point, the present embodiment has been described in detail with reference to the accompanying drawings. From the above description, one skilled in the art should clearly recognize the present application.

It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. Furthermore, the above definitions of the various elements and methods are not limited to the specific structures, shapes, or configurations shown in the examples.

It is also noted that the illustrations herein may provide examples of parameters that include particular values, but that these parameters need not be exactly equal to the corresponding values, but may be approximated to the corresponding values within acceptable error tolerances or design constraints. Directional phrases used in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., refer only to the orientation of the drawings and are not intended to limit the scope of the present application. In addition, unless steps are specifically described or must occur in sequence, the order of the steps is not limited to that listed above and may be changed or rearranged as desired by the desired design. The embodiments described above may be mixed and matched with each other or with other embodiments based on design and reliability considerations, i.e., technical features in different embodiments may be freely combined to form further embodiments.

The above-mentioned embodiments are further described in detail for the purpose of illustrating the invention, and it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not to be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A3D beats printer head which characterized in that: comprises that

The charging barrel (4) is used for containing printing materials (8), and the lower end of the charging barrel is provided with a discharge hole (41);

the caliber expansion device is provided with a plurality of movable blocking pieces (72) arranged around the discharge hole (41) of the charging barrel (4);

the glue discharging device is arranged around the charging barrel (4), and the lower end of the glue discharging device is provided with a glue discharging hole (61) surrounding the glue discharging hole (41);

the printing material is concrete, and the glue on the 3D printing head comprises the following components in parts by weight:

2. The 3D printhead of claim 1, wherein the bore expansion device is embedded in a wall of the cartridge (4), and a cavity for embedding the baffle (72) is formed in the wall of the cartridge (4).

3. The 3D printhead of claim 2, wherein the cavity is a smooth linear cavity with a cavity lower port extending to a wall of the discharge opening (41).

4. 3D print head according to claim 3, characterized in that the flap (72) extends along the cavity with its lower end near the lower port of the cavity.

5. The 3D printing head according to claim 4, wherein the baffle (72) is provided with a driving part for driving the baffle (72) to move towards the direction of the material barrel (4), the driving part is contacted with the upper end of the baffle (72) through a wedge-shaped surface (73), and the wedge-shaped surface (73) inclines towards the direction of the inner wall of the material barrel (4).

6. The 3D printing head according to claim 5, characterized in that the upper end of the baffle (72) is provided with a first inclined surface (721) inclined towards the inner wall of the charging barrel (4), the driving part comprises a push block (71), the push block (71) is designed in a ring shape and corresponds to the baffle (72) arranged in a surrounding way one by one, the push block (71) is provided with a second inclined surface (711) contacted with the first inclined surface (721), and the push block (71) applies a pushing force or a pulling force in a vertical direction to the baffle (72).

7. The 3D print head according to claim 6, wherein the driving part further comprises a push rod (74) fixedly arranged on the push block (71), and an application pad (76) exposed out of the cartridge (4) is fixed to an end of the push rod (74).

8. The 3D printing head according to claim 1, wherein the glue stabilizer on the 3D printing head is one or more of trioctyl phosphate and polyvinylpyrrolidone mixed in any proportion.

9. Use of a 3D print head according to any of claims 1 to 8, characterized in that it comprises the following steps:

(1) force is applied to the caliber expansion device to push the baffle plates (72) to extend towards the center of the discharge hole (41), and new discharge holes (41) smaller than the original discharge hole (41) are formed at the bottoms of the baffle plates (72);

(2) the printing material (8) in the charging barrel (4) is extruded from the new discharging hole (41), the extruded material passes through the glue discharging hole (61), the peripheral side surface is stained with glue solution, and the glue solution is bonded with the previously extruded material.