CN111318645A - 3D prints sanding mechanism - Google Patents
3D prints sanding mechanism Download PDFInfo
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- CN111318645A CN111318645A CN202010256048.4A CN202010256048A CN111318645A CN 111318645 A CN111318645 A CN 111318645A CN 202010256048 A CN202010256048 A CN 202010256048A CN 111318645 A CN111318645 A CN 111318645A
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- sand
- roller
- sanding
- motor
- sand roller
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/001—Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Road Paving Machines (AREA)
Abstract
The invention provides a 3D printing sand paving mechanism which comprises a sand storage hopper, wherein the sand storage hopper is surrounded by a front panel, a rear panel and two side panels, a sand supply port is arranged at the upper part of the sand storage hopper, a sand outlet with fixed width is arranged at the lower part of the sand storage hopper along the left-right direction, the front panel and the rear panel above the sand outlet are V-shaped in section along the front-back direction, a rear lower sand roller extending along the left-right direction is arranged below the lower end part of the rear panel, the rear lower sand roller is connected with a rear lower sand roller motor, and the rear lower sand roller motor is used for driving the rear lower sand roller to rotate forwards; a front lower sand roller extending along the left-right direction is arranged below the lower end part of the front panel, and is connected with a front lower sand roller motor which is used for driving the front lower sand roller to rotate backwards; the horizontal clearance between the front lower sand roller and the rear lower sand roller is smaller than the width of the sand outlet. The sand paving mechanism is simple in structure, more uniform in sand paving and adjustable in sand discharging amount, and can meet the requirements of the existing 3D printing technology.
Description
Technical Field
The invention relates to the technical field of three-dimensional printing equipment, in particular to a 3D printing sand laying mechanism.
Background
The 3D printing technology shortens the production and manufacturing time of new products, saves the development cost and promotes the design and development process of the new products. In the existing sand mold 3D printing apparatus, a sanding device is an essential important component. A large part of the factors of printing quality and efficiency of the 3D printing apparatus depend on the sanding device.
When the sanding device in the prior art is used for sanding sand for sand materials of different types or different humidity, the sand output and the uniformity of sanding cannot be guaranteed, so that the sanding quality and the sand type printing effect are influenced, and the rejection rate of sand molds is improved.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a 3D printing sand laying mechanism.
The purpose of the invention is realized by adopting the following technical scheme:
provides a 3D printing sand paving mechanism, which comprises a sand storage hopper, wherein the sand storage hopper is enclosed by a front panel, a rear panel and two side panels, the upper part of the sand storage hopper is provided with a sand supply port, the lower part of the sand storage hopper is provided with a sand outlet with fixed width along the left-right direction, the front panel and the rear panel above the sand outlet have V-shaped sections along the front-back direction, wherein,
a rear lower sand roller extending along the left-right direction is arranged below the lower end part of the rear panel, wherein the lower end part of the rear panel is over against the roller surface of the rear lower sand roller, and the left end and the right end of the rear lower sand roller are respectively fixedly connected with a sand storage hopper through a rear lower sand roller fixing block; the rear lower sand roller is connected with a rear lower sand roller motor, and the rear lower sand roller motor is used for driving the rear lower sand roller to rotate forwards;
a front lower sand roller extending along the left-right direction is arranged below the lower end part of the front panel, wherein the lower end part of the front panel is over against the roller surface of the front lower sand roller, the left end and the right end of the front lower sand roller are respectively connected with a front lower sand roller fixing block, and the front lower sand roller fixing block is fixedly connected with a sand storage hopper in a sliding manner through a guide rail arranged along the front-back direction; the front lower sand roller is connected with a front lower sand roller motor, and the front lower sand roller motor is used for driving the front lower sand roller to rotate backwards.
In one embodiment, the lower end part of the front panel is also provided with a movable baffle plate, the movable baffle plate is rotatably connected with the lower end part of the front baffle plate through a first rotating shaft arranged along the left-right direction, and the movable baffle plate is connected with the roller surface of the front lower sand roller.
In one embodiment, the side panels are fixedly connected with connecting plates, the connecting plates are connected with outer slide block connecting seats, outer slide blocks are arranged on the outer slide block connecting seats, and the outer slide blocks are used for being connected with external tracks or external driving mechanisms.
In an embodiment, the side panel is fixedly connected with a connecting plate, the connecting plate is provided with a rear lower sand roller motor synchronizing wheel, a rear lower sand roller synchronizing wheel and a rear lower sand roller motor, the rear lower sand roller motor synchronizing wheel is connected with the rear lower sand roller motor synchronizing wheel, the rear lower sand roller synchronizing wheel is connected with the rear lower sand roller, and the rear lower sand roller motor synchronizing wheel is connected with the rear lower sand roller synchronizing wheel through a rear synchronous belt.
In an embodiment, fixedly connected with connecting plate on the side board, connecting plate fixedly connected with scraper fixing base is provided with height-adjustable's scraper device on the scraper fixing base, and scraper device extends and length is more than or equal to the length of sand outlet along left and right sides direction.
In one embodiment, the scraper device comprises a first scraper and a second scraper arranged in tandem, leaving a gap between them, wherein the height of the bottom end of the first scraper from the horizontal plane is greater than the height of the bottom end of the second scraper from the horizontal plane.
In one embodiment, the front lower sand roller fixing block is fixedly connected with a guide rail arranged along the front-back direction, the guide rail is arranged in a limiting block, the guide rail can move back and forth in the limiting block, and the limiting block is fixedly connected with a sand storage hopper; the front lower sand roller fixing block can drive the front lower sand roller to move back and forth relative to the sand storage hopper under the driving of the power unit.
In one embodiment, the power unit comprises a single-side rack and a gear meshed with the single-side rack, the bottom of the single-side rack is fixedly connected with the front lower sand roller fixing block, the gear is in transmission connection with a power shaft, the power shaft is connected with a power shaft motor, and the power shaft motor is used for driving the gear to rotate forwards or backwards through the power shaft so as to drive the front lower sand roller to move forwards or backwards relative to the sand storage hopper.
In one implementation mode, a front motor fixing plate is further arranged on the front lower sand roller fixing block, a front lower sand roller motor is arranged on the front motor fixing plate and connected with a front motor synchronizing wheel, and the front motor synchronizing wheel is connected with a front lower sand roller synchronizing wheel on the front lower sand roller through a front synchronous belt.
In one embodiment, a sand raking plate is arranged in the sand storage hopper and is connected with a sliding cylinder, and the sliding cylinder drives the sand raking plate to reciprocate in the left-right direction.
The invention has the beneficial effects that: according to the sand paving mechanism, the rear lower sand roller rotating forwards and the front lower sand roller rotating backwards are arranged below the sand outlet of the sand storage hopper in a matched mode to pave sand, and the rear lower sand roller and the front lower sand roller can be driven by the motor to rotate to pave sand evenly; and the uniform degree of the sand can be controlled by adjusting the rotating speed of the rear sand discharging roller and the front sand discharging roller.
Simultaneously, preceding sand roller down can move about relative sand outlet, adjusts the width of actual sand outlet through adjusting preceding sand roller down and the back clearance width between the sand roller down to adjust the demand in order to satisfy actual conditions to the sand volume down.
The sand paving mechanism is simple in structure, more uniform in sand paving and adjustable in sand discharging amount, and can meet the requirements of the existing 3D printing technology.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a first perspective view of a sanding mechanism of the present invention;
FIG. 2 is a second perspective view of the sanding mechanism of the present invention;
FIG. 3 is a third perspective view of the sanding mechanism of the present invention;
FIG. 4 is a front plan view of the sanding mechanism of the present invention;
FIG. 5 is a schematic structural view of the sand raking plate of the present invention.
Reference numerals:
1-a sand storage hopper, 1 a-a front panel, 1 b-a rear panel, 2-a front lower sand roller, 3-a rear lower sand roller, 4-a rear lower sand roller synchronizing wheel, 5-a rear lower sand roller motor synchronizing wheel, 6-a rear synchronizing belt, 7-a front lower sand roller synchronizing wheel, 8-a front motor synchronizing wheel, 9-a front synchronizing belt, 10-a front motor fixing plate, 11-a front lower sand roller motor, 12-a guide rail, 13-a limiting block, 14-a second fixing block, 15-a power shaft fixing block, 16-a rack, 17-a gear, 18-a power shaft synchronizing wheel, 19-a third synchronizing belt, 20-a power shaft motor synchronizing wheel, 21-a power shaft motor fixing seat, 22-a power shaft motor, 23-a power shaft, 25-a connecting plate, 26-an outer slider connecting seat, 27-an outer sliding block, 29-a front lower sand roller fixing block, 30-a first scraper, 31-a scraper fixing seat, 32-a second scraper, 33-a sliding cylinder, 34-a sand raking plate and 35-a rear lower sand roller motor.
Detailed Description
The invention is further described in connection with the following application scenarios.
Referring to fig. 1 to 4, a 3D printing sand spreading mechanism is shown, which includes a sand storage hopper 1, wherein the sand storage hopper 1 is surrounded by a front panel 1a, a rear panel 1b and two side panels, a sand supply port is arranged at the upper part of the sand storage hopper 1, a sand outlet port with a fixed width is arranged at the lower part of the sand storage hopper 1 along the left-right direction, and the front panel 1a and the rear panel 1b above the sand outlet port have a V-shaped section along the front-back direction; wherein:
a rear lower sand roller 3 arranged along the left-right direction is arranged below the lower end part of the rear panel 1b, wherein the lower end part of the rear panel 1b is over against the roller surface of the rear lower sand roller 3, and the left end and the right end of the rear lower sand roller 3 are respectively fixedly connected with the sand storage hopper 1 through a rear lower sand roller fixing block; the rear lower sand roller 3 is connected with a rear lower sand roller motor 35, and the rear lower sand roller motor 35 is used for driving the rear lower sand roller 3 to rotate forwards;
a front lower sand roller 2 arranged along the left-right direction is arranged below the lower end part of the front panel 1a, wherein the lower end part of the front panel 1a is over against the roller surface of the front lower sand roller 2, the left end and the right end of the front lower sand roller 2 are respectively connected with a front lower sand roller fixing block 29, and the front lower sand roller fixing block 29 is fixedly connected with the sand storage hopper 1 in a sliding way through a guide rail arranged along the front-back direction; the front lower sand roller 2 is connected with a front lower sand roller motor 11, and the front lower sand roller motor 11 is used for driving the front lower sand roller 2 to rotate backwards.
In the above embodiment of the invention, a sand paving mechanism for sand mold 3D printing is provided, the mechanism paves sand by arranging a rear lower sand roller 3 rotating forward and a front lower sand roller 2 rotating backward in cooperation at a position below a sand outlet of a sand storage hopper 1, and can uniformly pave sand by driving the rear lower sand roller 3 and the front lower sand roller 2 to rotate by a motor; and the uniform degree of the sand production can be controlled by adjusting the rotating speed of the rear lower sand roller 3 and the front lower sand roller 2.
Simultaneously, preceding sand roller 2 down can move about relative sand outlet, adjusts the width of actual sand outlet through adjusting preceding sand roller 2 down and the back clearance width between the sand roller 3 down to adjust the demand in order to satisfy actual conditions to the sand volume down.
The sand paving mechanism provided by the invention is simple in structure, more uniform in sand paving, adjustable in sand discharging amount and capable of meeting the requirements of the existing 3D printing technology.
In one embodiment, the horizontal gap between the front lower sand roll 2 and the rear lower sand roll 3 does not exceed the width of the sand outlet, so as to ensure that sand can fall on the roll surfaces of the front lower sand roll 2 and the rear lower sand roll 3.
In order to ensure the even sanding effect, in actual arrangement, the gap between the front lower sanding roller 2 and the rear lower sanding roller 3 is not too large so as not to influence the effect of the sanding mechanism. In one scenario, the width of the sand outlet is 160 mm; it should be ensured that the gap between the front lower sand roll and the rear lower sand roll is not more than 10 mm.
In another scenario, the gap between the front and rear lower sand rolls is set to 5 mm.
In a preferred embodiment, the lower end of the rear panel 1b is in contact with the surface of the lower rear sanding roll 3 in order to avoid sand leakage during sanding.
In a preferred embodiment, the roller surface materials of the front lower sand roller 2 and the rear lower sand roller 3 are subjected to high-frequency chromium plating hardening surface treatment to improve the hardness and the abrasion resistance of the surface of the lower sand roller and ensure the sealing performance when the front lower sand roller 2 moves backwards until the roller surface is jointed with the roller surface of the rear lower sand roller 3 so as to close the sand storage hopper 1.
As a preferred embodiment, in order to ensure the effect of the sanding mechanism, the position of the front lower sand roller 2 is designed to meet the following requirements: thus when sand roller 2 backward shift is so that the closed sand storage hopper 1 of sand roller 3 contact down in the back down at present, just make the tip meet with the roller surface of sand roller 2 top or top rear under preceding under the front panel 1a for when sand roller 2 moved forward before making and increase the clearance, also can guarantee that sand material can fall on the roller surface of sand roller 2 under in the front.
In one embodiment, the lower end of the front panel 1a is further provided with a movable baffle plate, the movable baffle plate is rotatably connected with the lower end of the front baffle plate through a first rotating shaft arranged along the left-right direction, and the movable baffle plate is connected with the roller surface of the front lower sand roller 2.
In a preferred embodiment, the movable baffle is an arc-shaped baffle, and the radian of the arc-shaped baffle is designed to be consistent with the radian of the roller surface of the front lower sand roller 2. Through setting up arc adjustable fender for in the front when sand roller 2 moves forward and opens the sand outlet, still can make front panel 1a meet through adjustable fender and preceding sand roller 2's roll surface down, guarantee the leakproofness between front panel 1a and preceding sand roller 2 down, avoided because of the hourglass sand circumstances that probably appears after preceding sand roller 2 moves forward down.
Simultaneously, in order to guarantee the sanding effect of sanding mechanism, when designing adjustable fender, adjustable fender's width needs to satisfy: when the front lower sand roller 2 moves to the set position with the largest gap between the front lower sand roller 2 and the rear lower sand roller 3, the movable baffle plate can not completely prevent sand materials in the sand storage hopper 1 from falling onto the front lower sand roller 2.
In one embodiment, a connecting plate 25 is fixedly connected to the side panel, an outer slider connecting seat 26 is connected to the connecting plate 25, an outer slider 27 is arranged on the outer slider connecting seat 26, and the outer slider 27 is used for connecting with an external track or an external driving mechanism.
Wherein, the outside track sets up along fore-and-aft direction, and the direction that moves is the same with sanding mechanism during operation. When sanding mechanism spreads sand in 3D printing apparatus, the sanding apparatus is connected with 3D printing apparatus through outer slider 27 for under 3D printing apparatus's drive, the sanding mechanism can move along the fore-and-aft direction in 3D printing apparatus and evenly spread sand.
In one embodiment, a connecting plate 25 is fixedly connected to the side panel, a rear lower sand roller motor synchronizing wheel 5, a rear lower sand roller synchronizing wheel 4 and a rear lower sand roller motor 35 are arranged on the connecting plate 25, wherein the rear lower sand roller motor 35 is connected with the rear lower sand roller motor synchronizing wheel 5, the rear lower sand roller synchronizing wheel 4 is connected with the rear lower sand roller 3, and the rear lower sand roller motor synchronizing wheel 5 is connected with the rear lower sand roller synchronizing wheel 4 through a rear synchronous belt 6.
The back lower sand roller motor 35 drives the back lower sand roller 3 to rotate through the transmission mode of the synchronizing wheel and the synchronizing belt, the uniformity of the rotating speed of the back lower sand roller 3 can be improved, the uniformity of sand discharging of the sand paving mechanism when the back lower sand roller 3 rotates for sand paving is further improved, and the performance of the sand paving mechanism is indirectly improved.
In one embodiment, the side panels are fixedly connected with a connecting plate 25, the connecting plate 25 is fixedly connected with a scraper fixing seat 31, the scraper fixing seat 31 is provided with a scraper device with adjustable height, and the scraper device extends along the left-right direction and has a length greater than or equal to that of the sand outlet.
In one embodiment, the blade arrangement includes a first blade 30 and a second blade 32 arranged one behind the other, the first blade 30 and the second blade 32 having a gap therebetween, wherein a height of a bottom end of the first blade 30 from a horizontal plane is greater than a height of a bottom end of the second blade 32 from the horizontal plane.
The scraper device is arranged at the rear of the sand outlet, the height of the scraper device is set according to actual needs, and when sand is spilled out from the sand outlet along with the rotation of the sand roller 2 and the sand roller 3, the sand spreading mechanism moves forwards, and the scraper device spreads and compresses sand falling on a workpiece plane.
Further, the scraper device has included setting up the first scraper 30 in the place ahead and setting up the second scraper 32 at the rear, through going up the school adjustment to first scraper 30 and second scraper 32 for first scraper 30 highly be a little higher than second scraper 32, when spreading the sand material, first scraper 30 at first once pushes away the tie with the sand material that spills, makes the sand material evenly spread on the work piece plane, then second scraper 32 contacts the sand material once more and spreads the tie and compress tightly the sand bed secondary, improves the sanding quality. And a gap is reserved between the first scraper 30 and the second scraper 32, so that the sand material has a leveling space, and the effect of pressing the sand layer by the second scraper 32 is improved.
In one embodiment, the front lower sand roller fixing block 29 is fixedly connected with a guide rail 12 arranged along the front-back direction, the guide rail 12 is arranged in a limiting block 13, the guide rail 12 can move back and forth in the limiting block 13, and the limiting block 13 is fixedly connected with the sand storage hopper 1 through a second fixing block 14; the front lower sand roller fixing block 29 can drive the front lower sand roller 2 to move back and forth relative to the sand storage hopper 1 under the driving of the power unit.
The limiting block 13 is used for limiting the guide rail 12 to only horizontally move along the front-back direction, and meanwhile, in order to guarantee the sanding effect of the sanding mechanism and avoid transition movement of the front lower sanding roller 2, the limiting block 13 can be provided with the limiting mechanism at a corresponding position so as to limit the distance of the front lower sanding roller 2 moving back and forth.
In one embodiment, the power unit comprises a single-sided rack 16 and a gear 17 engaged with the single-sided rack 16, the bottom of the single-sided rack 16 is fixedly connected with a front lower sand roller fixing block 29, the gear 17 is in transmission connection with a power shaft 23, the power shaft 23 is connected with a power shaft motor 22, and the power shaft motor 22 is used for driving the gear 17 to rotate forwards or backwards through the power shaft 23 so as to drive the front lower sand roller 2 to move forwards or backwards relative to the sand storage hopper 1.
In one embodiment, the power shaft 23 is fixedly connected with the sand storage hopper 1 through a power shaft fixing block 15; a power shaft motor 22 is fixed on the outer side of the front panel 1a of the sand storage hopper 1 through a power shaft motor fixing seat 21, a power shaft synchronizing wheel 18 is arranged on a power shaft 23, the power shaft motor 22 is connected with the power shaft motor synchronizing wheel 20, wherein the power shaft synchronizing wheel 18 is connected with the power shaft motor synchronizing wheel 20 through a third synchronizing belt 19, so that the power shaft motor 22 drives the power shaft 23 to rotate through the third synchronizing belt 19, a gear 17 is driven to rotate, a single-side rack 16 moves forwards or backwards, and finally a front lower sand roller fixing block 29 is driven to move correspondingly, so that the front lower sand roller 2 moves forwards or backwards.
Through the setting of guide rail 12 and stopper 13, can prescribe a limit to the removal of preceding sand roller 2 down, simultaneously, through the setting of power shaft 23 cooperation gear 17 and rack 16 for preceding sand roller 2 can be moved forward or backward under the drive of power shaft motor 22 down, thereby opens or closes sand mouth down. The transmission and limiting structure has strong reliability.
In one embodiment, a front motor fixing plate 10 is further disposed on the front lower sand roller fixing block 29, a front lower sand roller motor 11 is disposed on the front motor fixing plate 10, the front lower sand roller motor 11 is connected with a front motor synchronizing wheel 8, and the front motor synchronizing wheel 8 is connected with a front lower sand roller synchronizing wheel 7 on the front lower sand roller 2 through a front synchronizing belt 9.
In one embodiment, a sand raking plate 34 is arranged in the sand storage hopper 1, the sand raking plate 34 is connected with a sliding cylinder 33, and the sliding cylinder 33 drives the sand raking plate 34 to reciprocate in the left-right direction.
In order to avoid the caking of the sand material caused by the static time process in the sand storage hopper 1, the sand raking plate 34 is arranged in the sand storage hopper 1 to reciprocate the sand material, so that the sand material in the sand storage hopper 1 is kept in a loose state, the smoothness of the sand material during sand discharging is improved, and the uniformity of the sand paving mechanism is indirectly improved.
In one embodiment, the sand raking plate 34 comprises a connecting rod extending in the left-right direction, wherein the connecting rod is provided with a fixing rod fixedly connected with the sliding cylinder 33; still be provided with a plurality of sand raking rods of downwardly extending on the connecting rod, wherein a plurality of sand raking rods evenly distributed along on the connecting rod, and leave the space between the adjacent sand raking rod.
Wherein the direction of the fixed rod has an angle difference with the extending direction of the sand raking rod, and the angle difference is more than 90 degrees as a preferred embodiment.
In a preferred embodiment, the plurality of sand raking rods extend downwards to face the position of the sand outlet.
The work flow of the sand paving mechanism is as follows:
fixing the front lower sand roller fixing block 29 and the left and right ends of the front lower sand roller 2, so that the front lower sand roller 2 can rotate under the fixation of the front lower sand roller fixing block 29; meanwhile, the front lower sand roller fixing blocks 29 at the left and right ends are respectively provided with a rack 16 and a guide rail 12, wherein the guide rail 12 is arranged in a slide block, so that the guide rail 12 can move back and forth in the slide block, and the slide blocks at the left and right ends are respectively fixed on the sand storage hopper 1 through the fixing blocks. The racks 16 at the left end and the right end are provided with gears 17 engaged with the racks, the gears 17 at the left end and the right end are connected through a power shaft 23, wherein the power shaft 23 is connected through a power shaft synchronous wheel 18 on the power shaft 23 and a power shaft motor synchronous wheel 20 of a power shaft motor 22 through a third synchronous belt 19, so that the power shaft motor 22 can control the front lower sand roller 2 to move back and forth in parallel through the power shaft 23.
The first scraper 30 and the second scraper 32 are arranged in parallel and have a height difference, and the heights of the first scraper 30 and the second scraper 32 are adjusted up and down in the scraper fixing seat 31 according to actual needs.
When the 3D printer starts to spread sand, the rear lower sand roller motor 35 and the front lower sand roller motor 11 are controlled to be started through an external control circuit system, so that the rear lower sand roller motor 35 rotates forwards and the front lower sand roller motor 11 rotates backwards; the rear lower sand roller motor 35 rotates by driving the synchronizing wheel thereon, the rear lower sand roller motor synchronizing wheel 5 is connected with the rear lower sand roller synchronizing wheel 4 through the rear synchronous belt 6, wherein the rear lower sand roller synchronizing wheel 4 is fixedly connected with the rear lower sand roller 3, so that the rear lower sand roller motor 35 drives the rear lower sand roller 3 to synchronously rotate forwards (clockwise). Similarly, the front lower sand roller motor 11 drives the front lower sand roller 2 to synchronously rotate backwards (anticlockwise) through the synchronizing wheel, the front synchronizing shaft and the front lower sand roller synchronizing wheel 7 on the front lower sand roller motor. Meanwhile, the power shaft motor 22 controls the front lower sand roll 2 to move forward for a certain distance in parallel, so that a certain horizontal gap is reserved between the front lower sand roll 2 and the rear lower sand roll 3. At this time, the sliding cylinder 33 slides left and right under the control of external air to drive the sand raking plate 34 connected with the sliding cylinder to slide left and right in a reciprocating manner, so that the sand in the sand storage hopper 1 keeps a loose state, the sand slides on the front lower sand roller 2 and the rear lower sand roller 3, and uniformly spills out from a gap between the front lower sand roller 2 and the rear lower sand roller 3 along with the rotation of the front lower sand roller 2 and the rear lower sand roller 3 and falls on a workpiece plane. Along with the movement of the sanding mechanism, the first scraper 30 firstly paves the spilled sand so that the sand is uniformly paved on the plane of the workpiece, and then the second scraper 32 further contacts the sand to pave and compact the sand layer, thereby improving the sanding quality.
When the sanding is finished, the external circuit control system controls the front lower sand roller 2 to move backwards to the starting point by controlling the power shaft motor 22, so that the roller surfaces of the front lower sand roller 2 and the rear lower sand roller 3 are in contact, and the effect of stopping the sanding is achieved.
In actual operation, in order to aim at different types of sand materials and improve printing efficiency, sand layers with different thicknesses need to be laid, in the invention, the sand discharging amount is controlled by controlling the gap between the front sand discharging roller 2 and the rear sand discharging roller 3, the sand material laying uniformity is improved by adopting a mode that the front sand discharging roller 2 and the rear sand discharging roller 3 are matched and rotated, and meanwhile, the sand layer laying is carried out by the arranged first scraper 30 and the second scraper 32, so that the working performance and the efficiency of the sand laying mechanism can be improved simultaneously.
In the present invention, in the terms "front lower sand roll", "rear lower sand roll", "front lower sand roll motor", "rear lower sand roll motor", and the like, "front" and "rear" are used merely to indicate that they are different members, and are not intended to limit absolute orientations; the "front lower sand roll" may also be referred to as a "rear lower sand roll" in some specific cases, and is not particularly limited herein.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be analyzed by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A3D printing sand paving mechanism comprises a sand storage hopper, wherein the sand storage hopper is formed by a front panel, a rear panel and two side panels in a surrounding mode, a sand supply opening is formed in the upper portion of the sand storage hopper, a sand outlet opening with a fixed width is formed in the lower portion of the sand storage hopper in the left-right direction, the front panel and the rear panel above the sand outlet opening are V-shaped in cross section in the front-back direction, and the sand paving mechanism is characterized in that,
a rear lower sand roller extending along the left-right direction is arranged below the lower end part of the rear panel, wherein the lower end part of the rear panel is over against the roller surface of the rear lower sand roller, and the left end and the right end of the rear lower sand roller are respectively fixedly connected with the sand storage hopper through a rear lower sand roller fixing block; the rear lower sand roller is connected with a rear lower sand roller motor, and the rear lower sand roller motor is used for driving the rear lower sand roller to rotate forwards;
a front lower sand roller extending along the left-right direction is arranged below the lower end part of the front panel, wherein the lower end part of the front panel is over against the roller surface of the front lower sand roller, the left end and the right end of the front lower sand roller are respectively connected with a front lower sand roller fixing block, and the front lower sand roller fixing block is fixedly connected with the sand storage hopper in a sliding manner through a guide rail arranged along the front-back direction; the front lower sand roller is connected with a front lower sand roller motor, and the front lower sand roller motor is used for driving the front lower sand roller to rotate backwards.
2. The 3D printing sanding mechanism according to claim 1, wherein a movable baffle is further arranged at the lower end of the front panel, the movable baffle is rotatably connected with the lower end of the front baffle through a first rotating shaft arranged along the left-right direction, and the movable baffle is connected with the roller surface of the front lower sand roller.
3. The 3D printing sanding mechanism of claim 1 wherein the side panels are fixedly connected with a connecting plate, the connecting plate is connected with an outer slider connecting seat, and an outer slider is arranged on the outer slider connecting seat and used for connecting with an external rail or an external driving mechanism.
4. The 3D printing sanding mechanism according to claim 1, wherein a connecting plate is fixedly connected to the side plate, and a rear lower sanding roller motor synchronizing wheel, a rear lower sanding roller synchronizing wheel and the rear lower sanding roller motor are arranged on the connecting plate, wherein the rear lower sanding roller motor is connected with the rear lower sanding roller motor synchronizing wheel, the rear lower sanding roller synchronizing wheel is connected with the rear lower sanding roller, and the rear lower sanding roller motor synchronizing wheel is connected with the rear lower sanding roller synchronizing wheel through a rear synchronous belt.
5. The 3D printing sanding mechanism according to claim 1, wherein a connecting plate is fixedly connected to the side plate, a scraper fixing seat is fixedly connected to the connecting plate, a scraper device with adjustable height is arranged on the scraper fixing seat, the scraper device extends in the left-right direction, and the length of the scraper device is greater than or equal to that of the sand outlet.
6. The 3D printing sanding mechanism of claim 5, wherein the scraper device comprises a first scraper and a second scraper arranged in tandem, a gap is left between the first scraper and the second scraper, and the height of the bottom end of the first scraper from the horizontal plane is greater than the height of the bottom end of the second scraper from the horizontal plane.
7. The 3D printing sanding mechanism according to claim 1, wherein the front lower sanding roller fixing block is fixedly connected with the guide rail arranged in the front-back direction, the guide rail is arranged in a limiting block, the guide rail can move back and forth in the limiting block, and the limiting block is fixedly connected with the sand storage hopper; the front lower sand roller fixing block can drive the front lower sand roller to move back and forth relative to the sand storage hopper under the driving of the power unit.
8. The 3D printing sanding mechanism of claim 7, wherein the power unit comprises a single-sided rack and a gear engaged with the single-sided rack, the bottom of the single-sided rack is fixedly connected with the front lower sand roller fixing block, the gear is in transmission connection with a power shaft, the power shaft is connected with a power shaft motor, and the power shaft motor is used for driving the gear to rotate forwards or backwards through the power shaft so as to drive the front lower sand roller to move forwards or backwards relative to the sand storage hopper.
9. The 3D printing sanding mechanism according to claim 1, wherein a front motor fixing plate is further arranged on the front lower sanding roller fixing block, the front lower sanding roller motor is arranged on the front motor fixing plate, the front lower sanding roller motor is connected with a front motor synchronizing wheel, and the front motor synchronizing wheel is connected with a front lower sanding roller synchronizing wheel on the front lower sanding roller through a front synchronizing belt.
10. The 3D printing sanding mechanism according to claim 1, wherein a sand raking plate is arranged in the sand storage hopper, the sand raking plate is connected with a sliding cylinder, and the sliding cylinder drives the sand raking plate to reciprocate in the left-right direction.
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