CN111674044A

CN111674044A - Full-color 3D printer

Info

Publication number: CN111674044A
Application number: CN202010538971.7A
Authority: CN
Inventors: 叶月云; 王中刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-13
Filing date: 2020-06-13
Publication date: 2020-09-18

Abstract

The invention belongs to the technical field of printers, and particularly relates to a full-color 3D printer which comprises a rack; a horizontal driving unit is arranged on the rack, a vertical driving unit is arranged on the horizontal driving unit, a printing device is arranged on the vertical driving unit, and a heating device for heating the printing device is arranged on the printing device; one side of the printing device is provided with an air extractor for extracting waste gas, and one side of the printing device is connected with a fan through a bracket; the middle part of the frame is fixedly connected with a printing platform; a wind shield is arranged between the fan and the printing device and used for reducing the influence of the fan on the printing precision; according to the invention, the wind shield is arranged between the fan and the printing device, so that the airflow blown out by the fan can not directly blow to the printing material in a molten state, the airflow blown out by the fan bypasses the wind shield and then blows to the printing material near the printing device, and further the printing material is cooled by the solidifying device after being initially cooled and shaped, and the influence of the fan on the precision of a printed product is reduced.

Description

Full-color 3D printer

Technical Field

The invention belongs to the technical field of printers, and particularly relates to a full-color 3D printer.

Background

3D printing (3DP), one of the rapid prototyping technologies, also known as additive manufacturing, is a technology that constructs an object by using an adhesive material, such as powdered metal or plastic, on the basis of a digital model file and by printing layer by layer; 3D printing is typically achieved using digital technology material printers; the method is often used for manufacturing models in the fields of mold manufacturing, industrial design and the like, and then is gradually used for directly manufacturing some products, and parts printed by the technology are already available; the technology has applications in jewelry, footwear, industrial design, construction, engineering and construction (AEC), automotive, aerospace, dental and medical industries, education, geographic information systems, civil engineering, firearms, and other fields; the printing technology appears in the middle of the 90 s of the 20 th century, and is actually the latest rapid prototyping device utilizing technologies such as photocuring and paper lamination; the printing machine is basically the same as the common printing working principle, the printer is filled with liquid or powder and other printing materials, after the printing materials are connected with a computer, the printing materials are overlapped layer by layer under the control of the computer, and finally, a blueprint on the computer is changed into a real object; this printing technique is called a 3D stereoscopic printing technique; the 3D printing equipment is used in the 3D printing process, the three-dimensional model is manufactured layer by layer in a layer-by-layer stacking mode, the operation process of the three-dimensional model is similar to that of a traditional printer, only the traditional printer prints ink on paper to form two-dimensional plane drawing, and the three-dimensional printer realizes layer-by-layer stacking and superposition of materials such as liquid photosensitive resin materials, molten plastic wires and gypsum powder to form a three-dimensional entity in a mode of spraying a binder or extruding and the like.

Some technical schemes about 3D printer have also appeared among the prior art, as chinese patent with application number 2018113618405 discloses a novel full-color 3D printer, including the support of base and base below is lived, its characterized in that: the symmetry is equipped with the Y axle on the base, be equipped with the Y axle feed box of motion with it that cooperatees on the Y axle, be equipped with the Z axle of following its removal on the Y axle feed box, be equipped with the Z axle feed box of motion with it that cooperatees on the Z axle, be equipped with the X axle of following its removal on the Z axle feed box, be equipped with the X axle feed box of motion with it that cooperatees on the X axle, be equipped with backup pad one on the X axle feed box, be equipped with first colour workbin, second colour workbin, third colour workbin and fourth colour workbin on the backup pad one, the X axle feed box is equipped with printing device. However, in the prior art, when the printed product is cooled by the fan, because the air outlet direction of the fan is aligned with the printing device, the lateral air blown by the fan easily blows the unset printed material, which affects the precision of the printed product.

Disclosure of Invention

In order to make up for the defects of the prior art and solve the problem that in the prior 3D printing technology, when a printed product is cooled by a fan, the air outlet direction of the fan is aligned with a printing device, lateral air blown by the fan easily blows unsolidified printing materials, and the precision of the printed product is affected, the full-color 3D printer provided by the invention is provided.

The technical scheme adopted by the invention for solving the technical problems is as follows: the full-color 3D printer comprises a rack; the printing device comprises a rack, a vertical driving unit, a printing device and a heating device, wherein the rack is provided with the horizontal driving unit, the horizontal driving unit is provided with the vertical driving unit, the vertical driving unit is provided with the printing device, and the printing device is provided with the heating device for heating the printing device; an air extracting device for extracting waste gas is arranged on one side of the printing device, and a fan is connected to one side of the printing device through a support; the middle part of the rack is fixedly connected with a printing platform; a wind shield is arranged between the fan and the printing device and used for reducing the influence of the fan on the printing precision; the curing device of the prior printer blows air transversely to the printing device through the rotation of a fan arranged at one side of the printing device, so that cold air blows molten printing materials extruded by the printing device, the printing materials are cured and bonded quickly, the printing efficiency is improved, but because the printing materials sprayed by the printing device are heated to be in a molten state, the fluidity is increased, the cooling air blown by the fan blows and displaces the printing materials easily when passing through the printing materials at the printing device, the printing precision of the printing device is influenced, the printing precision of a product is further influenced, at the moment, the air flow blown by the fan cannot directly blow the printing materials in the molten state through a wind shield arranged between the fan and the printing device, and the air flow blown by the fan bypasses the wind shield and then blows the printing materials near the printing device, and then make the cooling of passing through solidification equipment after the printing material is tentatively cooled and stereotyped, reduce the precision influence of fan to the printed product.

Preferably, the bottom of the wind shield is fixedly connected with a screen, the screen is arched, and the diameters of meshes of two wings of the screen are larger than that of a dome of the screen, so that the influence of wind speed on the precision of printed products is further reduced, and the screen is used for reducing the influence of the wind speed on the precision of the printed products; further disperse the air velocity that the fan blew off through the screen cloth of arch, avoid high velocity air direct impact to print the material when guaranteeing cooling efficiency, and then reduce the skew error that print the material arouses because of wind-force blows, increase the size precision of printing the product, because the screen cloth is the arch, and the mesh diameter of screen cloth both wings is greater than the mesh diameter of screen cloth vault, make the air velocity of screen cloth vault department below further reduce, and then make the print material that just extrudes from printing device below the hunch top department stable solidification, guarantee size precision, the air velocity of screen cloth both wings below is greater than the air current of screen cloth hunch top department simultaneously, make the air current accelerate the print material of cooling lower part, guarantee the print material from top to bottom and accelerate the cooling step by step, guarantee the solidification efficiency of fan to print material.

Preferably, the fan is horizontally installed, and the air outlet direction of the fan faces downwards; the periphery of the fan is provided with an air duct, the air duct is fixedly connected with the bracket, the diameter of the upper part of the air duct is larger than that of the lower part of the air duct, and the air blowing efficiency of the fan is increased by matching the air duct with the fan; because the fan horizontal installation, and the air-out direction of fan is down, further avoid the fan to directly blow printing device, the restriction of cooperation draft duct to the air current simultaneously reduces the air current loss of fan bottom, and then increases the efficiency that the fan blew the air, reduces the power consumption of fan when guaranteeing predetermined air supply volume, the energy saving.

Preferably, the top of the air duct is provided with an air inlet cover, the air inlet cover faces one side of the printing device, and the printing device is ensured to normally work by adding the heat dissipation speed of the printing device through the air inlet cover; through the air near the air inlet cover extraction printing device, and then make more cold air flow through printing device periphery, and then increase printing device's heat dispersion, guarantee that printing device normally works, reduce the overheated mobile influence to printing material of printing device, guarantee to print work and go on smoothly.

Preferably, a group of sliding grooves are formed in the air guide cylinder and correspond to the fan, sliding blocks are connected in the sliding grooves in a sliding mode, and the sliding blocks are fixedly connected with the fan through connecting rods; an air cylinder is arranged between the sliding block and one end of the sliding groove, a water tank is fixedly connected to the outer side of the air guide cylinder, and the top of the water tank is communicated with the air cylinder through an air pipe; an annular water pipe is fixedly connected in the air guide cylinder below the fan, a group of water spray heads are uniformly arranged on the water pipe, and the water pipe is communicated with the bottom of the water tank through a pipeline; the water spray head sprays water mist, so that the cooling speed of a printed product is further increased; when the fan blows off the air current downwards, the fan receives upward reaction force, and then the fan drives the slider to slide upwards, the slider extrudes the cylinder after sliding upwards, compressed air generated by the cylinder fills the water tank through the air pipe, cooling water in the water tank is extruded after the air pressure at the top of the water tank is increased, the cooling water is led into the water pipe through the pipeline, and then is sprayed out through the water spray head to form water mist, the temperature of the air current is reduced when one part of the water mist is evaporated, the air current blown off by the fan is blown to a printed product along with the other part of the water mist, and then the temperature of the printed product is rapidly reduced, so that the printed product is.

Preferably, the sprinkler head faces to a side close to the fan, and the airflow blown out by the fan further increases the diffusion degree of the water mist sprayed by the sprinkler head, so as to further increase the cooling speed of the printed product; because the sprinkler bead orientation is close to fan one side for sprinkler bead spun water smoke forms the offset with the air current that the fan blew out, and then makes the more abundant water smoke that blows off of air current, makes water smoke distribution more even, has increased the evaporation heat absorption effect of water smoke, makes more even the scattering of water smoke on the printing material surface simultaneously, increases the printing product solidification shaping speed.

The invention has the following beneficial effects:

1. according to the full-color 3D printer, the wind shield is arranged between the fan and the printing device, so that airflow blown out by the fan cannot directly blow printing materials in a molten state, the airflow blown out by the fan bypasses the wind shield and then blows the printing materials near the printing device, the printing materials are cooled by the solidifying device after being initially cooled and shaped, and the influence of the fan on the precision of printed products is reduced.

2. According to the full-color 3D printer, when the fan blows air flow downwards, the fan is subjected to an upward reaction force, the fan drives the sliding block to slide upwards, the sliding block slides upwards and then presses the air cylinder, compressed air generated by the air cylinder is filled into the water tank through the air pipe, cooling water in the water tank is extruded after the air pressure at the top of the water tank is increased, the cooling water is communicated with the water pipe through the pipeline and then is sprayed out through the water spraying head to form water mist, the temperature of the air flow is reduced when one part of the water mist is evaporated, the other part of the water mist is blown to a printed product along with the air flow blown by the fan, the temperature of the printed product is rapidly reduced, and the printed product is rapidly.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a sectional view of the air guide duct and the air inlet cover according to the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

FIG. 4 is an enlarged view of a portion of FIG. 2 at B;

in the figure: the screen printing device comprises a frame 1, a horizontal driving unit 11, a vertical driving unit 12, a printing device 13, an air extracting device 14, a support 15, a fan 16, a printing platform 17, a wind shield 2, two screen wings 22, a screen vault 23, an air guide cylinder 24, an air inlet cover 25, a sliding chute 3, a sliding block 31, an air cylinder 32, a water tank 33, an air pipe 34, a water pipe 35 and a water spray head 36.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 4, the full-color 3D printer according to the present invention includes a frame 1; a horizontal driving unit 11 is arranged on the rack 1, a vertical driving unit 12 is arranged on the horizontal driving unit 11, a printing device 13 is arranged on the vertical driving unit 12, and a heating device for heating the printing device 13 is arranged on the printing device 13; an air extracting device 14 for extracting waste gas is arranged on one side of the printing device 13, and a fan 16 is connected to one side of the printing device 13 through a support 15; the middle part of the frame 1 is fixedly connected with a printing platform 17; a wind shield 2 is arranged between the fan 16 and the printing device 13, and the wind shield 2 is used for reducing the influence of the fan 16 on the printing precision; the curing device of the existing printer performs transverse blowing on the printing device 13 through the rotation of the fan 16 arranged on one side of the printing device 13, so that cold air blows molten printing materials extruded by the printing device 13, the printing materials are rapidly cured and bonded, and the printing efficiency is improved, but because the printing materials sprayed by the printing device 13 are heated to be in a molten state, the fluidity is increased, so that the cooling air blown by the fan 16 easily blows and displaces the printing materials when flowing through the printing materials at the printing device 13, the printing precision of the printing device 13 is affected, and the printing precision of a product is affected, at the moment, through the wind shield 2 arranged between the fan 16 and the printing device 13, the air flow blown by the fan 16 cannot directly blow the printing materials in the molten state, and the air flow blown by the fan 16 blows the printing materials near the printing device 13 after bypassing the wind shield 2, and then make the printing material cool off the cooling of solidification equipment again after the preliminary cooling design, reduce the precision influence of fan 16 to the printed product.

As an embodiment of the invention, the bottom of the wind shield 2 is fixedly connected with a screen which is arched, and the mesh diameters of two wings 22 of the screen are larger than that of a dome 23 of the screen, so that the influence of wind speed on the precision of printed products is further reduced; further disperse the air velocity that fan 16 blew out through the screen cloth of arch, avoid high velocity air to directly strike the printing material when guaranteeing cooling efficiency, and then reduce the printing material and blow the skew error that arouses because of wind-force, increase the size precision of printing the product, because the screen cloth is the arch, and the mesh diameter of screen cloth both wings 22 is greater than the mesh diameter of screen cloth vault 23, make the air velocity of screen cloth vault 23 below further reduce, and then make the printing material that just extrudes from printing device 13 below vault 23 stabilize the solidification, guarantee size precision, the air velocity of screen cloth both wings 22 below is greater than the air current of screen cloth vault 23 simultaneously, make the air current accelerate the printing material of cooling lower part, guarantee the printing material from top to bottom accelerate the cooling step by step, guarantee fan 16 is to the solidification efficiency of printing material.

In one embodiment of the present invention, the fan 16 is horizontally installed, and the air outlet direction of the fan 16 is downward; an air duct 24 is arranged on the periphery of the fan 16, the air duct 24 is fixedly connected with the support 15, the diameter of the upper part of the air duct 24 is larger than that of the lower part of the air duct, and the air blowing efficiency of the fan 16 is improved by matching the air duct 24 with the fan 16; because the fan 16 is horizontally arranged, and the air outlet direction of the fan 16 is downward, the direct blowing of the fan 16 to the printing device 13 is further avoided, and the air guide duct 24 is matched to limit the air flow, so that the air flow loss at the bottom of the fan 16 is reduced, the air blowing efficiency of the fan 16 is further increased, the power consumption of the fan 16 is reduced while the preset air supply amount is ensured, and the energy is saved.

As an embodiment of the present invention, an air inlet cover 25 is disposed on the top of the air duct 24, the air inlet cover 25 faces the side of the printing device 13, and the printing device 13 is ensured to normally operate by adding the heat dissipation speed of the printing device 13 through the air inlet cover 25; through the air inlet cover 25 extraction near printing device 13, and then make more cold air flow through printing device 13 periphery, and then increase printing device 13's heat dispersion, guarantee that printing device 13 normally works, reduce printing device 13 and overheat the mobile influence to printing material, guarantee that printing work goes on smoothly.

As an embodiment of the present invention, a set of sliding grooves 3 is disposed in the air duct 24 at a position corresponding to the fan 16, a sliding block 31 is slidably connected in the sliding grooves 3, and the sliding block 31 is fixedly connected to the fan 16 through a connecting rod; an air cylinder 32 is arranged between the sliding block 31 and one end of the sliding chute 3, a water tank 33 is fixedly connected to the outer side of the air guide duct 24, and the top of the water tank 33 is communicated with the air cylinder 32 through an air pipe 34; an annular water pipe 35 is fixedly connected in the air duct 24 below the fan 16, a group of water spray heads 36 are uniformly arranged on the water pipe 35, and the water pipe 35 is communicated with the bottom of the water tank 33 through a pipeline; the water spray head 36 sprays water mist to further increase the cooling speed of the printed product; when the fan 16 blows air downwards, the fan 16 is subjected to an upward reaction force, so that the fan 16 drives the slider 31 to slide upwards, the slider 31 presses the air cylinder 32 after sliding upwards, compressed air generated by the air cylinder 32 is filled into the water tank 33 through the air pipe 34, cooling water in the water tank 33 is extruded after the air pressure at the top of the water tank 33 is increased, the cooling water is introduced into the water pipe 35 through the pipeline and is sprayed out through the water spraying head 36 to form water mist, the temperature of the air flow is reduced when one part of the water mist is evaporated, the other part of the water mist is blown to a printed product along with the air flow blown by the fan 16, and the temperature of the printed product is further rapidly reduced, so that the printed product.

In one embodiment of the present invention, the sprinkler head 36 faces toward the side close to the fan 16, and the airflow blown by the fan 16 further increases the diffusion degree of the water mist sprayed by the sprinkler head 36, thereby further increasing the cooling speed of the printed product; because sprinkler head 36 is towards being close to fan 16 one side for sprinkler head 36 spun water smoke forms the offset with the air current that fan 16 blew out, and then makes the more abundant water smoke that blows off of air current, makes water smoke distribute more evenly, has increased the evaporation heat absorption of water smoke, makes more even the scattering of water smoke on the printing material surface simultaneously, increases the printing product solidification shaping speed.

When the curing device of the existing printer works, the fan 16 arranged on one side of the printing device 13 rotates to transversely blow air to the printing device 13, so that cold air blows molten printing materials extruded by the printing device 13, the printing materials are rapidly cured and bonded, and the printing efficiency is improved, but as the printing materials sprayed by the printing device 13 are heated to be in a molten state, the fluidity is increased, so that the cooling air blown by the fan 16 easily blows and displaces the printing materials when flowing through the printing materials at the printing device 13, the printing precision of the printing device 13 is influenced, and the printing precision of a product is further influenced, at the moment, the air flow blown by the fan 16 cannot directly blow the printing materials in the molten state through the wind shield 2 arranged between the fan 16 and the printing device 13, and the air flow blown by the fan 16 blows the printing materials near the printing device 13 after bypassing the wind shield 2, further, the printing material is cooled by the curing device after being initially cooled and shaped, so that the influence of the fan 16 on the precision of a printed product is reduced; the air flow speed blown out by the fan 16 is further dispersed through the arched screen, the cooling efficiency is ensured, meanwhile, the high-speed air flow is prevented from directly impacting the printing material, the deviation error of the printing material caused by wind blowing is further reduced, and the size precision of a printed product is increased, because the screen is arched, and the mesh diameters of the two wings 22 of the screen are larger than that of the dome 23 of the screen, the air flow speed below the dome 23 of the screen is further reduced, so that the printing material just extruded from the printing device 13 below the dome 23 is stably solidified, the size precision is ensured, meanwhile, the air flow speed below the two wings 22 of the screen is larger than that of the dome 23 of the screen, the air flow is used for accelerating and cooling the printing material at the lower part, the printing material is ensured to be accelerated and cooled from top to bottom step by step, and; because the fan 16 is horizontally arranged, and the air outlet direction of the fan 16 is downward, the direct blowing of the fan 16 to the printing device 13 is further avoided, and the air flow is limited by the air guide cylinder 24, so that the air flow loss at the bottom of the fan 16 is reduced, the air blowing efficiency of the fan 16 is further increased, the power consumption of the fan 16 is reduced while the preset air supply amount is ensured, and the energy is saved; the air near the printing device 13 is extracted through the air inlet cover 25, so that more cold air flows through the periphery of the printing device 13, the heat dissipation performance of the printing device 13 is improved, the normal work of the printing device 13 is ensured, the influence of overheating of the printing device 13 on the fluidity of a printing material is reduced, and the smooth operation of the printing work is ensured; when the fan 16 blows air flow downwards, the fan 16 is subjected to an upward reaction force, so that the fan 16 drives the slider 31 to slide upwards, the slider 31 presses the air cylinder 32 after sliding upwards, compressed air generated by the air cylinder 32 is filled into the water tank 33 through the air pipe 34, cooling water in the water tank 33 is extruded after the air pressure at the top of the water tank 33 is increased, the cooling water is introduced into the water pipe 35 through a pipeline and is sprayed out through the water spraying head 36 to form water mist, the temperature of the air flow is reduced when one part of the water mist is evaporated, the other part of the water mist is blown to a printed product along with the air flow blown by the fan 16, and the temperature of the printed product is further rapidly reduced, so that the printed; because sprinkler head 36 is towards being close to fan 16 one side for sprinkler head 36 spun water smoke forms the offset with the air current that fan 16 blew out, and then makes the more abundant water smoke that blows off of air current, makes water smoke distribute more evenly, has increased the evaporation heat absorption of water smoke, makes more even the scattering of water smoke on the printing material surface simultaneously, increases the printing product solidification shaping speed.

The front, the back, the left, the right, the upper and the lower are all based on figure 1 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and the like.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A full-color 3D printer, comprising a frame (1); a horizontal driving unit (11) is arranged on the rack (1), a vertical driving unit (12) is arranged on the horizontal driving unit (11), a printing device (13) is arranged on the vertical driving unit (12), and a heating device for heating the printing device (13) is arranged on the printing device (13); an air extraction device (14) for extracting waste gas is arranged on one side of the printing device (13), and a fan (16) is connected to one side of the printing device (13) through a support (15); the middle part of the frame (1) is fixedly connected with a printing platform (17); the method is characterized in that: and a wind shield (2) is arranged between the fan (16) and the printing device (13), and the wind shield (2) is used for reducing the influence of the fan (16) on the printing precision.

2. The full-color 3D printer according to claim 1, characterized in that: the bottom of the wind shield (2) is fixedly connected with a screen which is arched, and the diameter of meshes of two wings (22) of the screen is larger than that of meshes of a vault (23) of the screen, so that the influence of wind speed on the precision of printed products is further reduced, and the influence of the wind speed on the precision of the printed products is reduced.

3. The full-color 3D printer according to claim 2, characterized in that: the fan (16) is horizontally arranged, and the air outlet direction of the fan (16) faces downwards; the periphery of the fan (16) is provided with an air duct (24), the air duct (24) is fixedly connected with the support (15), the diameter of the upper part of the air duct (24) is larger than that of the lower part of the air duct, and the air blowing efficiency of the fan (16) is improved by matching the air duct (24) with the fan (16).

4. A full-color 3D printer according to claim 3, characterized in that: an air inlet cover (25) is arranged at the top of the air duct (24), the air inlet cover (25) faces one side of the printing device (13), and the printing device (13) is guaranteed to normally work by the aid of the air inlet cover (25) and the heat dissipation speed of the printing device (13).

5. The full-color 3D printer according to claim 4, characterized in that: a group of sliding grooves (3) are formed in the air guide cylinder (24) and correspond to the fan (16), sliding blocks (31) are connected in the sliding grooves (3) in a sliding mode, and the sliding blocks (31) are fixedly connected with the fan (16) through connecting rods; an air cylinder (32) is arranged between the sliding block (31) and one end of the sliding chute (3), a water tank (33) is fixedly connected to the outer side of the air guide cylinder (24), and the top of the water tank (33) is communicated with the air cylinder (32) through an air pipe (34); an annular water pipe (35) is fixedly connected in the air guide cylinder (24) below the fan (16), a group of water spray heads (36) are uniformly arranged on the water pipe (35), and the water pipe (35) is communicated with the bottom of the water tank (33) through a pipeline; water mist is sprayed out through the water spray head (36), and the cooling speed of the printed product is further increased.

6. The full-color 3D printer according to claim 5, characterized in that: the sprinkler head (36) faces to one side close to the fan (16), and the air flow blown out by the fan (16) further increases the diffusion degree of water mist sprayed out by the sprinkler head (36), so that the cooling speed of a printed product is further increased.