A sand mold 3D printer print head cleaning device

Abstract

The present invention discloses a sand mold 3D printer print head cleaning device, which relates to the field of sand mold 3D printing technology, and comprises a main body bracket, a print head cleaning seat capable of vertically slidingly connecting the main body bracket, a print head air drying mechanism rotatable to the top of the print head cleaning mechanism, a cover plate hingedly connected to the upper component, and a notch provided on the cover plate near the edge of the opposite cover plate. The present invention provides a cover plate, and when the print head brushing component is working, it is inevitable that cleaning liquid will splash. The cover plate provided here, even if the cleaning liquid splashes onto the cover plate, the splashed cleaning liquid will flow into the cleaning liquid storage tank along the inclined cover plate and the inclined surface of the inclined shell, which can effectively reduce the situation where the cleaning liquid splashes out of the cleaning area, and try to avoid the cleaning liquid splashing onto the workbench to affect the solidification of the sand body. Moreover, the cleaning liquid is corrosive, so it can also avoid splashing onto the printer equipment as much as possible, which can protect the equipment and extend the service life of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a printing head cleaning device for a sand mold 3D printer. Background Art

[0002] Since the casting sand mold 3D printing process uses a droplet jet print head to spray a high-viscosity adhesive combined with loose sand to achieve additive manufacturing, the printing process has many suspended sand particles and a harsh micro-environment; and ink droplets will be adsorbed on the surface of the print head during operation. After solidification, the ink droplets will form stubborn dirt that needs to be cleaned. In order to maintain the equipment and extend its service life, the print head of the sand mold 3D printer needs to be cleaned regularly.

[0003] The existing application number is CN202120909616.6, which is a 3D printing head cleaning mechanism, including a cleaning box and a fixed frame, wherein the cleaning box port is upward and elastically mounted on the fixed frame, and a cleaning liquid inlet interface is fixedly mounted on the side end of the bottom of the cleaning box, and a filter mechanism is fixedly provided at the bottom of the cleaning box, and the filter mechanism filters the cleaning liquid entering from the cleaning liquid inlet interface. The utility model relates to the technical field of 3D printers. The print head is linearly driven back and forth through the cleaning brush for cleaning, which improves the cleaning efficiency, and the spring gives the cleaning brush an upward force to ensure that the cleaning brush has a constant pressure on the bottom of the print head during the cleaning process, thereby improving the cleaning effect; the cleaning brush is driven to rotate by a rotating cylinder, and the liquid is replenished through the cleaning liquid inlet interface, so that the cleaning brush can be immersed in the cleaning liquid in real time through control, so as to replenish the cleaning liquid, thereby improving the degree of automation, and by setting a filter net, the cleaning liquid inlet interface can be prevented from being blocked.

[0004] When the above-mentioned 3D print head cleaning device is cleaning the print head, it is inevitable that the cleaning liquid will splash out of the cleaning area. Once the cleaning liquid splashes onto the workbench, it will affect the solidification of the sand body; at the same time, if the cleaning liquid splashes onto the printer equipment, it will corrode the equipment and shorten the service life of the equipment. Summary of the Invention

[0005] The purpose of the present invention is to provide a sand mold 3D printer print head cleaning device to solve the problem that the above-mentioned 3D printer head cleaning device proposed in the above background technology will inevitably cause the cleaning liquid to splash out of the cleaning area during the print head brushing operation. Once the cleaning liquid splashes onto the workbench, it will affect the solidification of the sand body; at the same time, if the cleaning liquid splashes onto the printer equipment, it will corrode the equipment and affect the service life of the equipment.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a sand mold 3D printer print head cleaning device, comprising a print head cleaning seat, a main body bracket vertically slidably connected to the print head cleaning seat, a print head cleaning mechanism installed on the main body bracket, and a print head air-drying mechanism that can be rotated to be directly above the print head cleaning mechanism, the print head cleaning mechanism comprising an upper component and a cover plate, the cover plates are symmetrically arranged in two groups on both sides of the sand mold 3D printer print head, and are respectively hingedly connected to the upper component, the cover plate is provided with a notch near the edge of the opposite cover plate, and in the air-drying working state, the sand mold 3D printer print head corresponds to the air-drying channel range of the print head air-drying mechanism.

[0007] Preferably, a scraper strip is installed at the notch of the cover plate, and when the two sets of cover plates are in abutment, the scraper strip at the notch position is adapted to the peripheral size of the print head of the sand mold 3D printer.

[0008] Preferably, the cover plate is hingedly connected to the mounting connector on the upper assembly, a torsion spring is provided on the connecting shaft between the mounting connector and the cover plate, and cover plate limiters are installed on both sides of the movable end of the cover plate, which can pull the cover plate downward to rotate.

[0009] Preferably, the cover plate limiting member includes a telescopic connecting member and a connecting end lifting drive, the telescopic connecting member includes a cover plate fixing member, a movable member and a connecting end, the cover plate fixing member and the movable member are provided in two groups, which are respectively installed on the edges of the cover plate, the cover plate fixing member fixes the cover plate, one end of the two groups of movable members is hinged to their respective cover plate fixing members, and the other end is jointly hinged to the connecting end, the connecting end lifting drive includes a connecting belt with one end fixedly connected to the connecting end, a roller with the other end of the connecting belt wrapped around and fixed, and a driving member that drives the roller to rotate.

[0010] Preferably, the print head air drying mechanism includes support rods and air drying channels, the outer sides of the two ends of the main body bracket are hingedly connected to the support rods, a second motor is installed on the outer side of a group of support rods, and an air drying channel is set between the movable ends of the two groups of support rods, and a sealing strip is set on the inner edge of the opening on the air drying channel.

[0011] Preferably, the upper component includes a cleaning liquid storage tank, and water inlet and outlet parts are respectively provided at both ends of the inner bottom plate of the cleaning liquid storage tank. The print head cleaning mechanism also includes a print head brushing component, and the print head brushing component is installed on the inner bottom plate of the cleaning liquid storage tank.

[0012] Preferably, the print head brushing assembly includes a brush head assembly, the number and arrangement of the brush head assemblies inside the cleaning liquid storage tank are consistent with the number and arrangement of the discharge holes of the print head, the brush head assembly includes a connecting seat and a brush head, the brush head is rotatably connected to the connecting seat, and the print head brushing assembly also includes a driving connection assembly that can make the brush heads of multiple groups of brush head assemblies rotate synchronously and a driving member that drives the brush head of the brush head assembly located at one end to rotate.

[0013] Preferably, the print head cleaning mechanism also includes a lower layer component and an ultrasonic component, the lower layer component is sleeved on the bottom of the upper layer component, the ultrasonic component is provided in multiple groups, the ultrasonic component includes an ultrasonic generator, a spring connector and an ultrasonic vibration plate, one end of the ultrasonic generator is installed on the outer wall of the lower layer component through a spring connector, and an ultrasonic vibration plate is provided at the other end of the ultrasonic generator, and the ultrasonic vibration plate extends into the interior of the cleaning liquid storage tank.

[0014] Preferably, a water outlet filter housing is installed below the connection between the external bottom plate of the cleaning liquid storage tank and the water outlet part, and the print head cleaning mechanism also includes a wastewater filter assembly, and the wastewater filter assembly is installed on the water outlet filter housing, and the wastewater filter assembly includes a pull-out member and a filter screen, and the pull-out member is plugged into the through hole of the water outlet filter housing, and the pull-out member is adapted to the water outlet filter housing, and a through hole is set on the pull-out member from top to bottom, and a filter screen is installed in the through hole.

[0015] Preferably, the print head cleaning seat includes a base and a lifting assembly, two groups of lifting assemblies are arranged on the base, and the two groups of lifting assemblies are respectively connected to both sides of the main bracket, and the lifting assembly includes a support frame, a movable plate and a hydraulic press, the support frame is installed on the base, the movable plate is vertically slidably connected to the support frame, the body of the hydraulic press is fixed on the base, and the output end of the hydraulic press is connected to the bottom of the movable plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention provides a cover plate. When the print head brushing assembly is working, it is inevitable that the cleaning liquid will splash. The cover plate provided here can prevent the cleaning liquid from splashing onto the cover plate. The splashed cleaning liquid will flow into the cleaning liquid storage tank along the inclined cover plate and the inclined surface of the inclined shell. This can effectively reduce the situation where the cleaning liquid splashes out of the cleaning area and try to avoid the cleaning liquid splashing onto the workbench to affect the solidification of the sand body. In addition, the cleaning liquid is corrosive, so it can also avoid splashing onto the printer equipment as much as possible, which can protect the equipment and extend the service life of the equipment.

[0018] 2. The present invention provides a scraper bar and a print head air-drying mechanism on the cover plate. A notch is provided on the edge of the cover plate near the opposite cover plate, and a scraper bar is installed in the notch. The scraper bar at the notch matches the size of the circumference of the sand mold 3D printer print head. After cleaning, the print head cleaning mechanism adjusts its height downward, and the scraper bar located on the circumference of the print head can scrape off any remaining water droplets on the side of the print head. At the same time, the print head air-drying mechanism allows the air to be concentrated on the bottom of the print head for air-drying. The air-drying operation dries the bottom of the print head and the inside and outside of the print outlet, thereby preventing cleaning liquid from remaining on the print head and thus preventing it from falling onto the workbench.

[0019] 3. The present invention provides a brush head assembly, wherein one group of brush head assemblies is driven to rotate in a forward and reverse cycle, while the other groups of brush heads rotate in the same direction. The bristles of the brush heads are directed not only toward the periphery of the print head but also toward the inside of the print head hole. In conjunction with the cleaning structure built into the print head, the brush heads rotate back and forth in a cycle. Compared with the brush cleaning method in the prior art, the contact frequency with the print head is increased, and the cleaning coverage area is expanded, thereby improving the cleaning effect of the print head.

[0020] 4. The present invention uses an ultrasonic generator to generate a large number of cavities and bubbles in the cleaning liquid in the cleaning liquid storage tank. When the sound pressure or sound intensity reaches a certain level, the bubbles will expand rapidly and then suddenly close, causing the dirt on the surface of the print head to break up and easily fall off. While the print head brushing assembly is cleaning the print head, the setting of the ultrasonic generator further improves the cleaning effect of the print head, making the print head clean more thoroughly and less likely to leave residual dirt. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of the sand mold 3D printer print head cleaning operation state of the present invention.

[0022] Figure 2 This is a structural schematic diagram of the air-drying operation state of the sand mold 3D printer print head of the present invention.

[0023] Figure 3 It is a schematic structural diagram of the lifting assembly of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of the print head cleaning mechanism of the present invention.

[0025] Figure 5 Schematic diagram of the distribution of upper and lower components of the present invention.

[0026] Figure 6 Schematic diagram of the internal structure of the cleaning liquid storage tank of the present invention.

[0027] Figure 7This is a schematic structural diagram of the print head cleaning assembly of the present invention.

[0028] Figure 8 It is a schematic structural diagram of the wastewater filtration component of the present invention.

[0029] Figure 9 This is a schematic structural diagram of the cleaning liquid storage tank side cover of the present invention.

[0030] Figure 10 This is a schematic diagram of the cover plate installation position structure of the present invention.

[0031] Figure 11 It is a schematic diagram of the scraper strip structure on the cover plate of the present invention.

[0032] Figure 12 It is a schematic diagram of the cover plate connection structure of the present invention.

[0033] Figure 13 It is a schematic structural diagram of the cover plate limiting member of the present invention.

[0034] Figure 14 This is a schematic diagram of the position of the print head air drying mechanism of the present invention.

[0035] Figure 15 It is a schematic diagram of the air-drying channel structure of the present invention.

[0036] Figure 16 It is a schematic structural diagram of the ultrasonic component of the present invention.

[0037] In the figure: 1. Print head cleaning seat; 11. Base; 12. Lifting assembly; 121. Support frame; 122. Moving plate; 123. Hydraulic device; 13. Cleaning liquid storage tank; 131. Cleaning liquid extraction pump; 14. Cleaning waste water recovery tank; 141. Cleaning waste water extraction pump; 15. Air dryer; 2. Main frame; 21. Upper rotation limiter; 22. Lower rotation limiter; 3. Print head cleaning mechanism; 31. Upper assembly; 311. Cleaning liquid storage tank side cover; 3111. Inclined shell; 3112. Flange; 3113. Mounting connector; 3114. Torsion spring; 3115. Limiting block; 312. Cleaning liquid storage tank; 314. Water outlet filter shell; 32. Lower assembly; 33. Cover plate; 331. Scraper; 34. Cover plate limiter; 341. Telescopic connector; 3411. Cover plate fixing Fixed part; 3412, movable part; 3413, connecting end; 342, connecting end lifting drive; 3421, connecting belt; 3422, third motor; 3423, roller; 35, ultrasonic component; 351, ultrasonic generator; 352, spring connecting part; 353, ultrasonic vibration plate; 36, print head brushing component; 361, brush head assembly; 3611, connecting seat; 3612, gear; 3613, brush head; 362, drive connecting component; 3621, rack; 3622, connecting rod; 3623, supporting part; 363, first motor; 37, water inlet part; 38, water outlet part; 39, wastewater filter component; 391, drawer; 392, filter screen; 393, sealing ring; 4, print head air drying mechanism; 41, support rod; 42, air drying channel; 421, sealing strip; 43, second motor. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] An embodiment of the present invention provides a sand mold 3D printer print head cleaning device, such as Figure 1 and Figure 2 As shown, it includes a print head cleaning seat 1, a main body bracket 2 vertically slidingly connected to the print head cleaning seat 1, a print head cleaning mechanism 3 installed on the main body bracket 2, and a print head drying mechanism 4 that can be rotated to the top of the print head cleaning mechanism 3.

[0040] like Figure 1 、 Figure 2 and Figure 3As shown, the print head cleaning seat 1 includes a base 11 and a lifting assembly 12. Two groups of lifting assemblies 12 are provided on the base 11. The two groups of lifting assemblies 12 are respectively connected to the two sides of the main support 2. The lifting assembly 12 includes a support frame 121, a movable plate 122 and a hydraulic actuator 123. The support frame 121 is installed on the base 11, and the movable plate 122 is vertically slidably connected to the support frame 121. The body of the hydraulic actuator 123 is fixed on the base 11, and the output end of the hydraulic actuator 123 is connected to the bottom of the movable plate 122. The hydraulic actuator 123 can drive the main support 2 to drive the print head cleaning mechanism 3 and the print head drying mechanism 4 to adjust the height up and down relative to the base 11, thereby realizing the alternating work of the cleaning operation and the drying operation of the print head position of the sand mold 3D printer.

[0041] The base 11 is also provided with a cleaning liquid storage tank 13, a cleaning wastewater recovery tank 14, and an air dryer 15. The liquid inside the cleaning liquid storage tank 13 is pumped out by a cleaning liquid extraction pump 131, which is connected to the print head cleaning mechanism 3 via an inlet pipe. The cleaning wastewater recovery tank 14 extracts the wastewater after cleaning the sand mold 3D printer print head via a cleaning wastewater extraction pump 141, which is connected to the print head cleaning mechanism 3 via an outlet pipe.

[0042] like Figure 4 As shown, the print head cleaning mechanism 3 includes an upper component 31 , a lower component 32 , a cover plate 33 and a cover plate limiting member 34 .

[0043] like Figure 5 As shown, the upper component 31 includes a cleaning liquid storage tank 312 and a cleaning liquid storage tank side cover 311.

[0044] like Figure 6 As shown, a water inlet 37 and a water outlet 38 are respectively provided at both ends of the bottom plate of the cleaning liquid storage tank 312. The cleaning liquid enters the cleaning liquid storage tank 312 from the water inlet 37. When the cleaning liquid needs to be replaced, the cleaning waste water in the cleaning liquid storage tank 312 flows out from the water outlet 38. The print head cleaning mechanism 3 also includes a print head brushing assembly 36, which is installed on the bottom plate of the cleaning liquid storage tank 312. Figure 5 and Figure 7As shown, the print head brushing assembly 36 includes a brush head assembly 361, a drive connection assembly 362 and a first motor 363. The number and arrangement of the brush head assemblies 361 inside the cleaning liquid storage tank 312 are consistent with the number and arrangement of the discharge holes of the print head. The position of the discharge holes of each group of print heads is composed of multiple small holes arranged in an array. When there are multiple groups of discharge holes of print heads on the printer head, one brush head cannot completely clean them. Multiple groups are set and can be cleaned in conjunction to ensure that all discharge holes can be cleaned. In this embodiment, two groups of brush head assemblies 361 are adapted here to correspond to the discharge holes of the two groups of print heads. When the print head cleaning mechanism 3 moves to the print head position, the brush head assembly 361 corresponds to the bottom of the sand mold 3D printer print head, the brush head assembly 361 includes a connecting seat 3611, a gear 3612 and a brush head 3613, the connecting seat 3611 is fixed on the inner bottom surface of the cleaning liquid storage tank 312, the brush head 3613 is rotatably connected to the connecting seat 3611, and the lower part of the brush head 3613 is coaxially fixed to the connecting gear 3612; the driving connection assembly 362 includes a rack 3621, a connecting rod 3622 and a support member 3623, the rack 3621 and the gear 3612 are paired, and the rack 3621 corresponds to one side of the gear 3612 of each group of brush head assemblies 361, and the adjacent racks 3623 are fixed to the bottom of the cleaning liquid storage tank 312. 621 are connected by a connecting rod 3622, the connecting rod 3622 passes through the slot hole of the support member 3623, the connecting rod 3622 is fixed on the inner bottom surface of the cleaning liquid storage tank 312, the connecting rod 3622 is slidably connected to the support member 3623, and the sliding direction is parallel to the longitudinal direction of the cleaning liquid storage tank 312; the brush head assembly 361 at one end is provided with a driving member on the other side of the bottom plate of the cleaning liquid storage tank 312 at its corresponding position, and the driving member is a first motor 363, the body of the first motor 363 is fixed under the bottom plate of the cleaning liquid storage tank 312, the output end of the first motor 363 passes through the bottom plate of the cleaning liquid storage tank 312, and the output end of the first motor 363 is coaxial with the brush head 3613. The first motor 363 drives one group of its brush head assemblies 361 to rotate in forward and reverse cycles, and the brush heads 3613 of the other groups rotate in the same direction under the structure in which the corresponding rack 3621 and the gear 3612 are meshed and relatively movable. The brush direction of the brush head 3613 is not only toward the periphery of the print head, but also toward the inside of the print head hole. In conjunction with the cleaning structure built into the printer head, the brush head 3613 rotates back and forth in a cycle. Compared with the brushing method in the prior art, the contact frequency with the print head is increased, and the cleaning coverage area is increased, thereby improving the cleaning effect of the print head.

[0045] like Figure 16As shown, the print head cleaning mechanism 3 also includes an ultrasonic assembly 35, which is provided with multiple groups. The ultrasonic assembly 35 includes an ultrasonic generator 351, a spring connector 352, and an ultrasonic vibration plate 353. One end of the ultrasonic generator 351 is mounted on the outer wall of the lower assembly 32 via the spring connector 352. The other end of the ultrasonic generator 351 is provided with an ultrasonic vibration plate 353. The ultrasonic vibration plate 353 has a curved structure and extends into the end of the cleaning liquid storage tank 312. The ultrasonic assembly 35 can generate a large number of cavities and bubbles in the cleaning liquid in the cleaning liquid storage tank 312. When the sound pressure or sound intensity reaches a certain level, the bubbles will rapidly expand and then suddenly close, breaking up and easily removing the condensed resin remaining on the print head surface. While the print head brush assembly 36 is cleaning the print head, the provision of the ultrasonic assembly 35 further improves the cleaning effect of the print head, making the print head clean more thoroughly and preventing the condensed resin material from remaining on the surface. Moreover, compared with the prior art, the arrangement of the ultrasonic component 35 can also significantly cooperate with the cleaning structure built into the printer head to improve the efficiency of cleaning the position inside the print head hole.

[0046] like Figure 5 and Figure 8 As shown, a water outlet filter housing 314 is installed below the water outlet part 38 of the outer bottom plate of the cleaning liquid storage tank 312. The print head cleaning mechanism 3 also includes a wastewater filter component 39. The wastewater filter component 39 is installed on the water outlet filter housing 314. The wastewater filter component 39 includes a pull-out component 391, a filter screen 392 and a sealing ring 393. The pull-out component 391 is plugged into the through hole of the water outlet filter housing 314. The pull-out component 391 is adapted to the water outlet filter housing 314. A through hole is set from top to bottom on the pull-out component 391, and a filter screen 392 is installed in the through hole. In the inserted state, a sealing ring 393 is installed around the pull-out component 391 corresponding to the outer edge of the through hole of the water outlet filter housing 314. At the end of each cleaning, the cleaning wastewater in the cleaning liquid storage tank 312 flows from the water outlet part 38 into the wastewater filter assembly 39 at the position of the water outlet filter housing 314 for filtration, and the raw material sand impurities or residual resin debris that accidentally enter the cleaned material are collected in the filter net 392, reducing the situation where the raw material sand impurities or residual resin debris stay in the pipeline. After the cleaning is completed, the wastewater filter assembly 39 can be regularly pulled out to clean the granular impurities and dirt on the filter net 392. The sealing ring 393 can ensure that the wastewater filter assembly 39 is inserted into the water outlet filter housing 314 and isolated from the outside world to prevent the cleaning liquid from leaking.

[0047] The lower component 32 is sleeved on the bottom of the upper component 31, and the lower component 32 wraps the first motor 363 and the water outlet filter shell 314. The water inlet pipe passes through the lower component 32 and is connected to the water inlet part 37 of the cleaning liquid storage tank 312. The water outlet pipe passes through the lower component 32 and is connected to the bottom of the water outlet filter shell 314. The wastewater filter component 39 passes through the vertical surface of the lower component 32 and is inserted into the water outlet filter shell 314 of the cleaning liquid storage tank 312.

[0048] like Figure 9 As shown, the cleaning liquid storage tank side cover 311 is located at the upper part of the cleaning liquid storage tank 312 , and the cleaning liquid storage tank side cover 311 includes a sloped shell 3111 connected to the cleaning liquid storage tank 312 and a convex edge 3112 connected to the sloped shell 3111 .

[0049] like Figure 10 As shown, two groups of cover plates 33 are symmetrically arranged on both sides of the sand mold 3D printer print head. When the print head brush assembly 36 is working, it is inevitable that there will be splashing of cleaning liquid. The cover plates 33 provided here, even if the cleaning liquid splashes onto the cover plate 33, the splashing cleaning liquid will flow into the cleaning liquid storage tank 312 along with the inclined angle of the cover plate 33 and the inclined surface of the inclined shell 3111, which can effectively reduce the situation where the cleaning liquid splashes out of the cleaning area, and try to avoid the cleaning liquid splashing onto the workbench to affect the solidification of the sand body. Moreover, the cleaning liquid is corrosive, so it can also avoid splashing onto the printer equipment as much as possible, which can protect the equipment and extend the service life of the equipment. The cleaning liquid in the cleaning liquid storage tank 312 may fluctuate when the print head brush assembly 36 is working. The convex edge 3112 on the inclined shell 3111 can ensure that the print head extends into the cleaning liquid to an appropriate depth while effectively preventing the cleaning liquid from overflowing the cleaning liquid storage tank 312.

[0050] like Figure 11 As shown, a notch is provided at the edge of the cover plate 33 near the opposite cover plate 33, and a scraper bar 331 is installed at the notch. The scraper bar 331 at the notch position is adapted to the size of the peripheral side of the print head of the sand mold 3D printer. After cleaning is completed, the print head cleaning mechanism 3 adjusts its height downward, and the scraper bar 331 located on the peripheral side of the print head can scrape off the residual water droplets on the side of the print head, thereby reducing the residual amount of cleaning liquid on the side of the print head. At the same time, the residual water droplets scraped off fall onto the inclined shell 3111 along the inclined cover plate 33 and then flow into the cleaning liquid storage tank 312 along the inclined surface of the inclined shell 3111.

[0051] like Figure 12 and Figure 13As shown, the cover plate 33 is hingedly connected to the mounting connector 3113 on the inclined shell 3111 of the upper assembly 31, and a torsion spring 3114 is provided on the connecting shaft between the mounting connector 3113 and the cover plate 33. Both sides of the movable end of the cover plate 33 are provided with a cover plate limiter 34 that can pull the cover plate 33 downward to rotate, as shown in FIG. Figure 13 As shown, the cover plate limiting member 34 includes a telescopic connecting member 341 and a connecting end lifting drive 342, the telescopic connecting member 341 includes a cover plate fixing member 3411, a movable member 3412 and a connecting end 3413, the connecting end lifting drive 342 includes a connecting belt 3421, a third motor 3422 and a roller 3423, the cover plate fixing member 3411 and the movable member 3412 are provided in two groups, which are respectively installed on the edge of the movable end of the cover plate 33, the cover plate fixing member 3411 is fixedly connected to the cover plate 33, one end of the two groups of movable members 3412 is hinged on their respective cover plate fixing members 3411, and the other end is hinged on the connecting end 3413, the third motor 3422 is installed on the lower component 32 below the connecting end 3413, the output end of the third motor 3422 is sleeved with a roller 3423, the connecting belt One end of 3421 is fixedly connected to the roller 3423, and the other end is fixedly connected to the bottom of the connecting end 3413. The third motor 3422 drives the roller 3423 to rotate forward, and the connecting belt 3421 is wrapped around the roller 3423. The length of the connecting belt 3421 between the roller 3423 and the connecting end 3413 becomes shorter, and the connecting end 3413 drops. The two sets of cover fixing members 3411 respectively pull the connected cover plates 33 toward the middle and close; the third motor 3422 drives the roller 3423 to rotate reversely, and the connecting belt 3421 wrapped around the roller 3423 is released. The length of the connecting belt 3421 between the roller 3423 and the connecting end 3413 becomes longer. Under the action of the torsion spring 3114, the cover plate 33 can be opened upward, the position of the connecting end 3413 rises, and the connecting belt 3421 straightens.

[0052] During cleaning, when the print head cleaning mechanism 3 is positioned to a uniform height of the print head, the cover limiter 34 can merge the cover 33 toward the print head, forming a complete isolation for the cleaning operation. The scraper 331 also adheres to the surface of the print head, limiting the cleaning liquid from splashing out of the cleaning area.

[0053] The cover 33 is mainly used to block the places where the brush head 3613 may splash during cleaning. Therefore, the gaps at the two ends of the cover 33 do not affect its normal working effect. The ultrasonic vibration plate 353 penetrates into the cleaning liquid in the cleaning liquid storage tank 312 in this gap.

[0054] After the cleaning is completed, the print head cleaning mechanism 3 adjusts its height downwards and the scraper 331 leaves the height position of the printer head. The third motor 3422 drives the roller 3423 to rotate in the opposite direction. When the cover 33 is opened upwards at this time, an oblique limit stopper 3115 is provided on the inclined shell 3111 of the upper component 31 to limit the cover 33 from opening upwards at a large angle. When the upper component 31 rises for the next cleaning operation, the angle at which the cover 33 is opened can ensure that the printer head passes smoothly, so that the printer head is immersed in the cleaning liquid. At the same time, limiting the large opening angle can keep the upper side of the cover 33 It is an inclined surface. Since the upper component 31 is always located directly below the printer head, even if cleaning liquid remains on the bottom of the printer head, when the cleaning liquid accumulates and falls before the print head drying mechanism 4 is operated, the residual cleaning liquid can fall on the gap of the cover 33 or on the cover 33. The part that falls on the cover 33 will flow along its inclined surface from the gap with the inclined shell 3111 and through the inclined surface of the inclined shell 3111 into the cleaning liquid storage tank 312. During this period before the drying operation takes over, the situation where residual cleaning liquid flows onto the workbench or equipment can still be reduced.

[0055] like Figure 14 As shown, the print head air-drying mechanism 4 includes a support rod 41 and an air-drying channel 42. The outer sides of the two ends of the main bracket 2 are respectively hingedly connected to the support rods 41. A second motor 43 is installed on the outer side of a group of support rods 41. The body of the second motor 43 is fixed on the main bracket 2. The output end of the second motor 43 is fixedly connected to the support rod 41. An air-drying channel 42 is set between the movable ends of the two groups of support rods 41. After the operation of the print head cleaning mechanism 3 is completed, the air-drying channel 42 can be rotated to the top of the print head cleaning mechanism 3 under the driving action of the second motor 43, so as to facilitate the change from the cleaning state of the print head to the air-drying state. When the support rod 41 rotates on the main bracket 2 toward a perpendicular state relative to the main bracket 2, the upper rotation limiter 21 on the main bracket 2 limits the further rotation of the support rod 41, keeping the air-drying channel 42 at a perpendicular angle to the main bracket 2 and the base plate for installing the print head, thereby ensuring that when changing to the air-drying state, the air-drying channel 42 can be vertically close to the base plate for installing the print head and finally easily fit; when the support rod 41 rotates on the main bracket 2 toward a parallel state relative to the main bracket 2, the lower rotation limiter 22 on the main bracket 2 limits the further rotation of the support rod 41, and the upper rotation limiter 21 and the lower rotation limiter 22 are provided on both sides of the main bracket 2.

[0056] like Figure 15As shown, a sealing strip 421 is provided on the inner edge of the opening of the air-drying channel 42. The air inlet and air outlet of the air-drying channel 42 are located at both ends thereof. The air inlet of the air-drying channel 42 is connected to the air dryer 15, which performs a horizontal air-drying operation on the bottom of the sand mold 3D printer print head. The wind direction is parallel to the long direction of the air-drying channel 42, minimizing the flow of wind blowing into the inside of the print discharge hole and causing bubbles in the resin material. The air outlet of the air-drying channel 42 transmits the wind to a position away from the workbench through a pipe. The opening size of the air-drying channel 42 is slightly larger than the sand mold 3D printer print head. The sealing strip 421 is located between the opening of the air-drying channel 42 and the sand mold 3D printer print head, which can conveniently wrap the sand mold 3D printer print head completely during the rising process, so that the wind flowing in the air-drying channel 42 is not easy to flow out from between the opening of the air-drying channel 42 and the sand mold 3D printer print head to affect the stability of the sand body on the workbench, while improving the air-drying efficiency. The air drying operation dries the bottom of the print head and the inside and outside of the print outlet, which can prevent cleaning liquid from remaining on the print head and preventing it from falling onto the workbench.

[0057] Working process: Before the device performs the print head cleaning operation, the print head drying mechanism 4 is located on the side parallel to the main body bracket 2. First, the hydraulic device 123 drives the movable plate 122 and drives the main body bracket 2 to move upward as a whole. When the print head extends into the cleaning liquid storage tank 312 of the print head cleaning mechanism 3 to a suitable depth of cleaning liquid, it stops moving at this height of the print head cleaning mechanism 3; the third motor 3422 drives the roller 3423 to rotate forward, the connecting end 3413 descends, and the two groups of cover plate fixing parts 3411 fixed on the same side of the cover plate 33 move downward at the same time, and the movable end of the cover plate 33 rotates downward to become a merged state, and the scraper 331 at the notch corresponds to the outer surface of the print head; the cleaning liquid extraction pump 131 extracts the cleaning liquid into the cleaning liquid storage tank 312, and then the cleaning operation is performed, and the first motor 363 drives one group of brush head assemblies 361 rotates in a forward and reverse cycle, and the brush heads 3613 of other groups rotate in the same direction and speed under the structure in which the corresponding rack 3621 and gear 3612 are meshed and relatively movable. The number and position of the brush heads 3613 correspond to the discharge position of the print head. The brush heads 3613 rotate back and forth to clean the inside and outside of the print head. At the same time, the ultrasonic generator 351 is turned on to make the cleaning liquid in the cleaning liquid storage tank 312 generate ultrasonic energy to break and shake off the dirt on the surface of the print head; after the cleaning operation is completed, the hydraulic cylinder 123 drives the moving plate 122 and drives the main bracket 2 to move downward as a whole, and the scraper 331 of the cover plate 33 connecting the print head takes down the residual cleaning liquid droplets on the side of the print head. After leaving the height of the print head, the third motor 3422 drives the roller 3423 to rotate in the opposite direction, and the cover plate 33 returns to its original angle. After cleaning, if the cleaning liquid in the cleaning liquid storage tank 312 needs to be replaced, the cleaning liquid in the cleaning liquid storage tank 312 can be extracted by the cleaning wastewater extraction pump 141, so that the waste liquid of the cleaning liquid flows into the cleaning wastewater recovery tank 14. During this process, the waste liquid flowing out from the water outlet 38 will first pass through the wastewater filter component 39 at the position of the water outlet filter housing 314 for filtration, and the washed raw material sand impurities or residual resin debris will be collected in the filter net 392. After the liquid in the cleaning liquid storage tank 312 is completely pumped out, the wastewater filter component 39 can be extracted to clean the residue; finally, the print head is cleaned. During the air-drying operation, the second motor 43 drives the support rod 41 to rotate from a state parallel to the main support 2 to a state perpendicular to the main support 2, and the air-drying channel 42 rotates to the top of the print head cleaning mechanism 3, and then the hydraulic device 123 drives the movable plate 122 and drives the main support 2 to move upward as a whole until the sand mold 3D printer print head enters the air-drying channel 42, and the air dryer 15 starts to work. The air-drying air enters from the air inlet end of the air-drying channel 42 and passes through the interior and is discharged from the air outlet end, drying the print head soaked in the cleaning liquid, completing all the cleaning operations of the sand mold 3D printer print head.

[0058] The above are only embodiments of the present invention, and common sense such as the specific structures and characteristics of the schemes are not described in detail here. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A sand mold 3D printer print head cleaning device, characterized by: The invention comprises a print head cleaning seat (1), a main body bracket (2) vertically slidingly connected to the print head cleaning seat (1), a print head cleaning mechanism (3) installed on the main body bracket (2), and a print head air drying mechanism (4) capable of rotating to the top of the print head cleaning mechanism (3), wherein the print head cleaning seat (1) comprises a base (11) and a lifting assembly (12), two groups of lifting assemblies (12) are arranged on the base (11), and the two groups of lifting assemblies (12) are respectively connected to both sides of the main body bracket (2), the print head cleaning mechanism (3) comprises an upper assembly (31) and a cover plate (33), two groups of the cover plates (33) are symmetrically arranged on both sides of the sand mold 3D printer print head, and are respectively hingedly connected to the upper assembly (31), the upper assembly (31) comprises a cleaning liquid storage tank (312), a notch is provided on the edge of the cover plate (33) near the opposite side cover plate (33), a scraper strip (331) is installed at the notch of the cover plate (33), and a cleaning liquid storage tank (312) is provided in the state where the two groups of cover plates (33) are in contact with each other. In the state, the scraper (331) at the notch position is adapted to the size of the side of the print head of the sand mold 3D printer, the print head cleaning mechanism (3) is adjusted downward in height, and the scraper (331) located on the side of the print head can scrape off the water droplets remaining on the side of the print head. The print head air drying mechanism (4) includes a support rod (41) and an air drying channel (42). The outer sides of the two ends of the main support (2) are respectively hingedly connected to the support rods (41), and a second motor (43) is installed on the outer side of a group of support rods (41). A drying channel (42) is provided between the movable ends of the two groups of support rods (41), and a sealing strip (421) is provided on the inner edge of the opening of the drying channel (42). In the drying working state, the print head of the sand mold 3D printer is correspondingly within the range of the drying channel (42) of the print head drying mechanism (4), and the air inlet end and the air outlet end of the drying channel (42) are respectively located at both ends thereof. The bottom of the sand mold 3D printer print head is dried horizontally, and the wind direction is parallel to the long direction of the drying channel (42).

2. A sand mold 3D printer print head cleaning device according to claim 1, characterized in that: The cover plate (33) is hingedly connected to the mounting connector (3113) on the upper assembly (31); a torsion spring (3114) is provided on the connecting shaft between the mounting connector (3113) and the cover plate (33); and cover plate limiting members (34) capable of pulling the cover plate (33) downward to rotate are installed on both sides of the movable end of the cover plate (33).

3. A sand mold 3D printer print head cleaning device according to claim 2, characterized in that: The cover plate limiting member (34) comprises a telescopic connecting member (341) and a connecting end lifting drive (342); the telescopic connecting member (341) comprises a cover plate fixing member (3411), a movable member (3412) and a connecting end (3413); the cover plate fixing member (3411) and the movable member (3412) are provided in two groups, which are respectively mounted on the edges of the cover plate (33); the cover plate fixing member (3411) is fixedly connected to the cover plate (33); one end of the two groups of movable members (3412) is hinged to their respective cover plate fixing members (3411), and the other end is hinged to the connecting end (3413); the connecting end lifting drive (342) comprises a connecting belt (3421) with one end fixedly connected to the connecting end (3413); a roller (3423) around which the other end of the connecting belt (3421) is wound and fixed; and a driving member for driving the roller (3423) to rotate.

4. A sand mold 3D printer print head cleaning device according to claim 1, characterized in that: A water inlet (37) and a water outlet (38) are respectively provided at both ends of the inner bottom plate of the cleaning liquid storage tank (312). The print head cleaning mechanism (3) further comprises a print head brushing assembly (36), and the print head brushing assembly (36) is mounted on the inner bottom plate of the cleaning liquid storage tank (312).

5. A sand mold 3D printer print head cleaning device according to claim 4, characterized in that: The print head brushing assembly (36) includes a brush head assembly (361), the number and arrangement of the brush head assemblies (361) inside the cleaning liquid storage tank (312) are consistent with the number and arrangement of the discharge holes of the print head, the brush head assembly (361) includes a connecting seat (3611) and a brush head (3613), the brush head (3613) is rotatably connected to the connecting seat (3611), the print head brushing assembly (36) further includes a driving connection assembly (362) that can make the brush heads (3613) of multiple groups of brush head assemblies (361) rotate synchronously, and a driving member that drives the brush head (3613) of the brush head assembly (361) at one end to rotate. The print head cleaning mechanism (3) further comprises a lower component (32) and an ultrasonic component (35), wherein the lower component (32) is sleeved on the bottom of the upper component (31), and the ultrasonic component (35) is provided with multiple groups, wherein the ultrasonic component (35) comprises an ultrasonic generator (351), a spring connector (352) and an ultrasonic vibration plate (353), wherein one end of the ultrasonic generator (351) is mounted on the outer side wall of the lower component (32) via the spring connector (352), and the other end of the ultrasonic generator (351) is provided with an ultrasonic vibration plate (353), and the ultrasonic vibration plate (353) extends into the interior of the cleaning liquid storage tank (312).

6. A sand mold 3D printer print head cleaning device according to claim 4, characterized in that: A water outlet filter housing (314) is installed below the connection between the outer bottom plate of the cleaning liquid storage tank (312) and the water outlet member (38). The print head cleaning mechanism (3) further comprises a wastewater filter assembly (39). The wastewater filter assembly (39) is mounted on the water outlet filter housing (314). The wastewater filter assembly (39) comprises a drawer (391) and a filter screen (392). The drawer (391) is plugged into a through hole of the water outlet filter housing (314). The drawer (391) is adapted to the water outlet filter housing (314). A through hole is provided on the drawer (391) from top to bottom, and a filter screen (392) is installed in the through hole.

7. A sand mold 3D printer print head cleaning device according to claim 1, characterized in that: The lifting assembly (12) includes a support frame (121), a movable plate (122) and a hydraulic actuator (123), wherein the support frame (121) is mounted on the base (11), the movable plate (122) is vertically slidably connected to the support frame (121), the main body of the hydraulic actuator (123) is fixed on the base (11), and the output end of the hydraulic actuator (123) is connected to the bottom of the movable plate (122).

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