CN116587608B - Sand mould additive manufacturing adhesive system ink supply system and control method - Google Patents
Sand mould additive manufacturing adhesive system ink supply system and control method Download PDFInfo
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- CN116587608B CN116587608B CN202310408420.2A CN202310408420A CN116587608B CN 116587608 B CN116587608 B CN 116587608B CN 202310408420 A CN202310408420 A CN 202310408420A CN 116587608 B CN116587608 B CN 116587608B
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- ink supply
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- 239000004576 sand Substances 0.000 title claims abstract description 28
- 239000000654 additive Substances 0.000 title claims abstract description 23
- 230000000996 additive effect Effects 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 239000000853 adhesive Substances 0.000 title claims abstract description 17
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 239000007921 spray Substances 0.000 claims abstract description 25
- 238000003860 storage Methods 0.000 claims description 84
- 238000007639 printing Methods 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 17
- 239000011230 binding agent Substances 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/205—Means for applying layers
- B29C64/209—Heads; Nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
-
- 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
- B33Y10/00—Processes of additive manufacturing
-
- 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
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to a multi-adhesive system ink supply system of a sand mould additive manufacturing printer and a control method thereof. The ink supply system can be divided into two parts, namely a liquid path and a gas path, wherein the liquid path is an adhesive ink circulation loop, and the gas path is a pipeline for adjusting the internal pressure of the spray head so as to realize the control requirements of the spray head on the flow and the pressure of the ink under different working conditions. According to the invention, through the innovative combination of the air pump and the electromagnetic valve, the internal pressure of the spray head is controlled in real time, and the quick and stable feedback and adjustment of the pressure can be realized. The developed ink supply system does not need to strictly control the relative heights of the spray head and the secondary ink box. The system is also provided with a gas buffer bottle and a damper, so that pressure fluctuation generated by the air pump and the ink pump is greatly reduced.
Description
Technical Field
The invention relates to the technical field of ink-jet printing, in particular to a circulating ink supply system and a control method applied to a sand mould additive manufacturing printer.
Background
The sand additive manufacturing printer is characterized in that an adhesive system is changed into micro-droplets through a spray head to be sprayed on a substrate, so that the substrate is bonded, solidified and formed. The binder sprayed by the nozzle is provided by the ink supply system and meets the flow and pressure required by the nozzle to spray liquid drops, and the performance of the ink supply system directly influences the quality of the ink sprayed by the nozzle. Along with the development of the sand mould additive manufacturing printer to large-scale and rapid printing, the number of the driven spray heads is increased, the moving speed of printing parts is increased, and higher requirements are provided for the stability of an ink supply system and the number of the driven spray heads.
Most of the existing ink supply systems have simple structures and poor stability. Most of the ink is supplied by utilizing the siphon principle, the ink is supplied by utilizing the height difference between the ink box and the spray head, the pressure of the spray head is controlled, the device is not stable enough and is easy to be interfered by the outside, and when the viscosity of the ink is high, the ink supply effect is poor, and the defects of ink deposition, impurity aggregation and the like are easy to occur. The ink supply system for adjusting the ink pressure by the air pump or the negative pressure generator in the market at present is only used for providing one negative pressure required by printing for the spray head or simultaneously providing positive pressure and negative pressure, has a relatively simple structure and has limitation on the application of the large-scale sand type printer. And most of the current ink supply systems are designed and applied to non-circulating printing spray heads, and when impurities or bubbles enter the spray heads, the impurities or the bubbles can not be discharged in time, so that the printing effect is affected, the ink adapting to the ink supply system is pigment ink, and the ink is different from the special resin for sand mould printing.
The ink supply system has certain limitation on the sand mould additive manufacturing printer, has poor stability, is easy to generate ink leakage phenomenon, continuously generates pressure fluctuation and even brings air into the nozzle due to the fact that the nozzle can be in continuous motion in the printing process of the sand mould additive manufacturing printer, seriously influences the printing quality, and needs to be matched with the ink supply system of the sand mould additive manufacturing printer in consideration of the special property and the safety problem of ink used by the printer.
Disclosure of Invention
In order to solve the problems, the invention discloses an ink supply system and a control method of a sand mould additive manufacturing adhesive system, which are more matched with the development requirement of a sand mould additive manufacturing printer, and improve the flexibility, stability and safety of system pressure regulation and the number of driving spray heads.
The technical scheme adopted by the invention for achieving the purpose is as follows:
an ink supply system of a sand mould additive manufacturing adhesive system comprises a secondary ink box and an air storage tank; the secondary ink box is connected with the temperature sensor, the spray head group, the ink return damper, the ink return pump, the heating rod, the filter and the ink supply damper to form a circulation loop; the ink storage tank, the ink supply pump, the heating rod, the filter and the ink supply damper are connected to the ink supply cavity of the secondary ink box; the ink supply pressure cavity of the air storage tank is connected with the ink supply cavity of the secondary ink box through the ink supply overflow bottle, the ink return pressure cavity of the air storage tank is connected with the ink return cavity of the secondary ink box through the ink return overflow bottle, the other end of the ink supply cavity of the air storage tank is connected with the air pump through the ink supply pressure sensor, the first electromagnetic valve, the first gas buffer bottle, the fourth electromagnetic valve and the fifth electromagnetic valve, and the ink return pressure cavity of the air storage tank is connected with the air pump through the ink return pressure sensor, the second electromagnetic valve, the third electromagnetic valve and the second gas buffer bottle.
The secondary ink box is divided into an independent ink supply cavity and an ink return cavity, the two cavities are not communicated with each other, the ink supply cavity is provided with an ink supply liquid level sensor, and the ink return cavity is provided with an ink return liquid level sensor.
The ink supply overflow bottle is used for collecting the ink overflowed from the ink supply cavity in the secondary ink box; the ink return overflow bottle is used for collecting the ink overflowed from the ink return cavity in the secondary ink box.
Further, an ink supply liquid level sensor and an ink return liquid level sensor are respectively arranged in the ink supply cavity and the ink return cavity of the secondary ink box.
Further, an ink inlet of the nozzle group is connected with an ink supply cavity of the secondary ink box, and an ink outlet of the nozzle group is connected with an ink return cavity of the secondary ink box.
Further, the ink supply damper is used for reducing flow fluctuation of the ink supply pump and the ink return pump to the ink supply cavity of the secondary ink box.
Further, the ink return damper is used for reducing flow fluctuation of the ink return pump to the ink return cavity of the secondary ink box.
Further, the nozzle group is integrally combined by one or more nozzles.
Further, the filter is used for filtering impurities existing in the ink entering the ink supply cavity of the secondary ink box.
Further, an ink storage liquid level sensor is arranged in the ink storage tank and is used for monitoring the ink residual quantity in the ink storage tank.
Further, the temperature sensor monitors the temperature of the ink inlet of the nozzle group in real time, and the feedback signal controls the start and stop of the heating rod.
Further, the top end of the ink supply overflow bottle is respectively connected with the top end of the ink supply cavity of the secondary ink box and the bottom end of the ink supply pressure cavity of the air storage tank.
Further, the top end of the ink return overflow bottle is respectively connected with the top end of the ink return cavity of the secondary ink box and the bottom end of the ink return pressure cavity of the air storage tank.
Further, the ink supply pressure cavity and the ink return pressure cavity of the air storage tank are respectively provided with an ink supply liquid level alarm and an ink return liquid level alarm, and the alarm is carried out when the existence of ink in the cavity is detected. The pressure of the ink supply cavity and the pressure of the ink return cavity of the air storage tank respectively act on the two-stage ink supply cavity and the ink return cavity of the ink box to realize the internal pressure regulation of the spray head.
Furthermore, the air pump I can independently supply ink to the air storage tank through the on-off of the electromagnetic valve I, the electromagnetic valve II, the electromagnetic valve IV and the electromagnetic valve V or does not act on any cavity of the air storage tank.
Furthermore, the air pump can realize real-time pressure adjustment on the ink return pressure cavity of the air storage tank independently or simultaneously through the on-off of the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, or does not act on any cavity of the air storage tank.
Further, the first gas buffer bottle is used for reducing pressure fluctuation generated by the first gas pump.
Further, the second gas buffer bottle is used for reducing pressure fluctuation generated by the second gas pump.
Further, the ink supply pressure sensor monitors the internal pressure of the ink supply pressure cavity of the air storage tank in real time, and the ink return pressure sensor monitors the internal pressure of the ink return pressure cavity of the air storage tank in real time and feeds back a pressure signal. And controlling the on-off of the air pump I, the air pump II, the electromagnetic valve I, the electromagnetic valve II, the electromagnetic valve III, the electromagnetic valve IV and the electromagnetic valve V according to signals fed back by the ink supply pressure sensor and the ink return pressure sensor to realize the real-time regulation of pressure.
The control method of the ink supply system of the sand mould additive manufacturing adhesive system comprises the following steps:
step 1: the system supplies power, the ink supply system is started, the electromagnetic valve for controlling the air channel is switched on and off according to the actual application condition, the air pump I and the air pump II start to work, and the ink supply pressure cavity and the ink return pressure cavity of the air storage tank reach and maintain the set pressure range through the ink supply pressure sensor and the ink return pressure sensor feedback control air pump I and the air pump II;
step 2: the ink supply pump starts to work, ink in the ink storage tank is conveyed to the ink supply cavity of the secondary ink box, and the ink is positioned at the height of a set range under the control of the ink supply liquid level sensor; the ink in the ink supply cavity flows to the ink return cavity through the temperature sensor and the nozzle group under the action of the pressure difference between the ink supply pressure cavity and the ink return pressure cavity of the air storage tank; the ink return liquid level sensor controls the ink return pump to pump out the ink in the ink return cavity and circularly convey the ink to the ink supply cavity; when the temperature sensor detects that the ink entering the nozzle group reaches the set temperature, the heating rod stops working;
step 3: when the liquid levels in the ink supply cavity and the ink return cavity of the secondary ink box are in a set height range and the ink temperature reaches a set temperature, the ink supply pressure sensor controls the air pump I to adjust the pressure in the ink supply pressure cavity of the air storage tank to a working pressure range, and the ink return pressure sensor controls the air pump II to adjust the pressure in the ink return pressure cavity of the air storage tank to the working pressure range; at this time, the ink supply system enters a normal printing state, and the nozzle group can print normally.
Step 4: when printing is needed to be suspended or finished, the first air pump and the second air pump stop working, and the ink supply pressure cavity and the ink return pressure cavity of the air storage tank are communicated and constantly kept at a set negative pressure value; at the same time, the ink supply pump, the ink return pump, the heater rod and all the remaining detecting elements are stopped.
When the sensor of the Mo Yewei storage in the ink storage tank detects that the ink liquid level is too low, an alarm is given to remind the user of adding ink; if the existence of the ink is not detected, the ink supply system is forcibly stopped to work, and the ink supply system is in a state of stopping printing until the ink is added and printing is restarted; when any one of the ink supply liquid level alarm and the ink return liquid level alarm in the air storage tank detects that ink exists, the operation of the ink supply system is stopped immediately until the cleaning of overflowed ink is completed and the ink supply system is restarted.
The filter is used for filtering the ink in the circulation loop and ensuring the purity of the ink entering the ink supply cavity of the secondary ink box; the ink supply damper is used for reducing the influence of pressure fluctuation generated by the ink supply pump and the ink return pump on the ink supply cavity; the ink return damper is used for reducing the influence of pressure fluctuation generated by the ink return pump on the ink return cavity. The first air buffer bottle and the second air buffer bottle are respectively used for reducing pressure fluctuation generated by the first air pump and the second air pump.
The invention has the beneficial effects that:
1. the invention relates to a circulating ink supply system, printing ink comprises the ink in a spray head which always circulates, bubbles and impurities entering the spray head in the printing process can be taken away in time, the ink deposition is prevented, the influence on the printing effect is prevented, the circulating ink is filtered by a filter before entering a secondary ink box each time, and the purity of the ink in the printing head is ensured. The two dampers are arranged in the ink path, so that the fluctuation of ink flow generated when the ink pump conveys ink can be reduced, and the stability of the system is improved.
2. According to the invention, the pressure sensor is used for monitoring the internal pressure of the two chambers of the air storage tank, and the first air pump, the second air pump and each electromagnetic valve are controlled in a feedback manner, so that the internal pressure of the two chambers of the air storage tank can be accurately controlled and regulated in real time, the system stability is high, the response speed is high, and the ink supply system can accurately control the ink supply pressure at a high speed and stably even in a motion state. The positive pressure or the negative pressure of the two chambers of the air storage tank can be regulated independently or simultaneously by controlling the on-off of each electromagnetic valve, so that the pressure control is more flexible and various, the device is suitable for various working condition environments, and the limit of each part of the ink supply system to the installation position is greatly liberated. And the existence of the gas buffer bottle and the gas storage tank enables the pressure adjustment to be more gentle, and reduces the influence of pressure fluctuation generated by the air pump in the adjustment process on printing.
3. The ink storage tank internally provided with the liquid level alarm can remind of adding ink when the liquid level is too low, and the printing process does not need to be suspended during the ink adding process, so that the continuous operation of the system is ensured. The system is also provided with an overflow bottle and an alarm device, so that pollution and personal safety hazard caused by overflow of ink when faults occur are prevented.
4. The ink in the ink supply system is heated by the heating rod before entering the secondary ink box, and the starting and stopping of the heating rod are controlled according to the temperature sensor, and the temperature of the ink is controlled to be at a set temperature, so that the viscosity of the ink is suitable for jetting.
5. The ink supply system has the advantages of good stability, high response speed, accurate and rapid pressure regulation when in motion, no great limitation on the installation height requirements of all parts, flexible installation, suitability for large-scale development of sand printers, and better jet printing effect on resin binders aiming at the resin binders used for sand printing.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a pressure regulation, ink chamber level and ink temperature control system according to the present invention;
FIG. 3 is a schematic diagram of the liquid level logic control of the ink supply chamber of the secondary ink cartridge of the present invention;
FIG. 4 is a schematic diagram of the liquid level logic control of the ink return chamber of the secondary ink cartridge of the present invention;
FIG. 5 is a schematic diagram of the ink temperature logic control according to the present invention;
FIG. 6 is a schematic diagram of the pressure logic control of the present invention;
a pictorial sign;
101-ink tank, 102-ink tank Mo Yewei sensor, 103-ink pump, 104-heater rod, 105-filter, 106-ink damper, 107-secondary cartridge, 108-temperature sensor, 109-ink level sensor, 110-ink level sensor, 111-ink level damper, 112-ink pump, 113-nozzle set, 201-air tank, 202-ink level alarm, 203-ink level alarm, 204-ink overflow bottle, 205-ink overflow bottle, 206-ink pressure sensor, 207-ink pressure sensor, 208-solenoid valve one, 209-solenoid valve two, 210-solenoid valve three, 211-solenoid valve four, 212-solenoid valve five, 213-gas buffer bottle one, 214-gas buffer bottle two, 215-air pump one, 216-air pump two.
Detailed Description
The present invention is further illustrated in the following drawings and detailed description, which are to be understood as being merely illustrative of the invention and not limiting the scope of the invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
FIG. 1 is a schematic diagram of a sand additive manufacturing adhesive system ink supply system and control method according to the present invention.
The ink supply system of the adhesive system for sand mould additive manufacturing of the embodiment mainly supplies the resin adhesive used in the sand mould printing process, and the ink comprises various furan resins, phenolic resins and the like. The ink supply system comprises an ink storage tank 101, an ink storage Mo Yewei sensor 102, an ink supply pump 103, a heating rod 104, a filter 105, an ink supply damper 106, a secondary ink box 107, a temperature sensor 108, an ink supply level sensor 109, an ink return level sensor 110, an ink return damper 111, an ink return pump 112, a nozzle group 113, an air storage tank 201, an ink supply level alarm 202, an ink return level alarm 203, an ink supply overflow bottle 204, an ink return overflow bottle 205, an ink supply pressure sensor 206, an ink return pressure sensor 207, a solenoid valve one 208, a solenoid valve two 209, a solenoid valve three 210, a solenoid valve four 211, a solenoid valve five 212, a gas buffer bottle one 213, a gas buffer bottle two 214, a gas pump one 215 and a gas pump two 216.
The secondary ink cartridge 107 is divided into two parts of an ink supply cavity and an ink return cavity which are independent of each other, and the two cavities are not communicated; the flow of the ink in the secondary ink box 107 is returned to the ink return cavity of the secondary ink box 107 through the temperature sensor 108, the ink inlet of the nozzle group 113, the ink outlet of the nozzle group 113 and the ink return cavity bottom port of the secondary ink box 107 in sequence, the ink in the ink return cavity of the secondary ink box 107 is pumped out by the ink return pump 112 through the ink return damper 111, and is conveyed back to the ink supply cavity of the secondary ink box 107 through the heating rod 104, the filter 105 and the ink supply damper 106, so that an ink flow circulation is formed; the ink supply chamber and the ink return chamber are respectively provided with an ink supply level sensor 109 and an ink return level sensor 110 for monitoring the level height inside the chamber.
The ink storage tank 101 is a light-proof large-volume container, and a large amount of ink can be stored in the ink storage tank to ensure that the two chambers of the secondary ink box 107 are full of ink; an ink storage liquid level sensor 102 is arranged in the ink storage tank 101 to monitor the ink residual quantity in the ink storage tank 101, so that the sufficiency of ink is ensured; the ink tank 101 is externally connected with an ink supply pump 103, and ink in the ink tank 101 is conveyed to an ink supply cavity of the secondary ink box 107 through a heating rod 104, a filter 105 and an ink supply damper 106.
The air tank 201 is divided into two chambers of an ink supply pressure chamber and an ink return pressure chamber, which are not communicated with each other. The bottom of the ink supply pressure cavity is connected to the top port of the ink supply overflow bottle 204, the other top port of the ink supply overflow bottle 204 is connected to the top of the ink supply cavity of the secondary ink box 107, the ink supply overflow bottle 204 is used for preventing the ink in the ink supply cavity of the secondary ink box 107 from overflowing when faults occur, and the ink supply level alarm 202 is arranged in the ink supply pressure cavity of the air storage tank 201, and alarm processing is carried out when the existence of the ink in the ink supply pressure cavity is detected. The pressure in the ink supply pressure chamber acts on the ink supply chamber of the secondary ink cartridge 107. Similarly, the bottom of the ink return pressure cavity is connected to the top port of the ink return overflow bottle 205, the other top port of the ink return overflow bottle 205 is connected to the top of the ink return cavity of the secondary ink box 107, the ink return overflow bottle 205 is used for preventing the ink in the ink return cavity of the secondary ink box 107 from overflowing when faults occur, and the ink return liquid level alarm 203 is installed in the ink return pressure cavity of the air storage tank 201, and alarm processing is performed when the existence of the ink in the ink return pressure cavity is detected. The pressure in the ink return pressure chamber acts on the ink return chamber of the secondary ink cartridge 107.
The ink supply pressure sensor 206 is connected with the top port of the ink supply pressure cavity of the air storage tank 201, and monitors the pressure of the ink supply pressure cavity in real time; the ink return pressure sensor 207 is connected with the top port of the ink return pressure cavity of the air storage tank 201, and monitors the pressure of the ink return pressure cavity in real time.
The first air pump 215 is connected with the fifth electromagnetic valve 212, the fourth electromagnetic valve 211, the first air buffer bottle 213, the first electromagnetic valve 208 and the second electromagnetic valve 209, and is respectively connected to an ink supply pressure cavity and an ink return pressure cavity of the air storage tank 201 through the ink supply pressure sensor 206 and the ink return pressure sensor 207; the air pump II 216 is connected with the air buffer bottle II 214, the electromagnetic valve III 210, the electromagnetic valve II 209 and the electromagnetic valve I208, and is respectively connected to the ink supply pressure cavity and the ink return pressure cavity of the air storage tank 201 through the ink supply pressure sensor 206 and the ink return pressure sensor 207. The first gas buffer bottle 213 and the second gas buffer bottle 214 can effectively reduce pressure fluctuation generated by the air pump.
When the first air pump 215 and the first electromagnetic valve 208 are electrified, the pressure value in the ink supply pressure cavity of the air storage tank 201 can be increased; when the first air pump 215 is electrified with the first electromagnetic valve 208, the fourth electromagnetic valve 211 and the fifth electromagnetic valve 212, the pressure value in the ink supply pressure cavity of the air storage tank 201 can be reduced; when the air pump II 216 and the electromagnetic valve I208 are electrified, the pressure value in the ink return pressure cavity of the air storage tank 201 can be reduced; when only the air pump II 216 is electrified, the pressure values in the ink return pressure cavity and the ink supply pressure cavity of the air storage tank 201 can be reduced simultaneously; when the electromagnetic valve II 209 is electrified, the pressure of the two chambers of the air storage tank 201 is consistent and the pressure value is kept unchanged; when the solenoid valve II 209, the solenoid valve I208 and the solenoid valve IV 211 are electrified, the pressure in the two chambers of the air storage tank can be kept unchanged respectively; when only the first electromagnetic valve 208 is electrified, the ink supply pressure cavity of the air storage tank 201 can be communicated with the atmosphere; when the electromagnetic valve III 210 and the electromagnetic valve I208 are electrified, the ink return pressure cavity of the air storage tank 201 can be communicated with the atmosphere; when only the third solenoid valve 210 is energized, the ink supply pressure chamber and the ink return pressure chamber of the air tank 201 can be simultaneously caused to communicate with the atmosphere.
As shown in fig. 2, 3 and 4, the ink supply level sensor 109 is used for monitoring the level height in the ink supply cavity of the secondary ink cartridge 107, and when the level is lower than the lower limit value, the controller starts the ink supply pump 103 to supply the ink in the ink storage tank 101 to the ink supply cavity, and when the level reaches the upper limit value, the ink supply pump 103 is stopped; the ink return level sensor 110 is used for monitoring the ink return cavity level height of the secondary ink box 107, when the ink return cavity level is higher than the upper limit value, the ink return pump 112 is started to pump ink in the ink return cavity by the controller, and when the ink return cavity level is lower than the upper limit value, the ink return pump 112 is stopped.
As shown in fig. 2 and 5, the temperature sensor 108 is used for monitoring the temperature of the ink entering the nozzle group 113, when the temperature is lower than the lower limit temperature, the controller starts the heating rod 104 to heat the ink, and when the temperature is higher than the upper limit temperature, the heating rod 104 stops working, and the ink naturally dissipates heat.
As shown in fig. 2 and 6, the ink supply pressure sensor 206 and the ink return pressure sensor 207 monitor the internal pressure of the ink supply pressure chamber and the ink return pressure chamber of the air tank 201, and control the on-off of the air pump and the electromagnetic valve, so as to realize the adjustment of the pressure.
The ink supply system and the control algorithm of the sand mould additive manufacturing adhesive system provided by the invention have the following 3 working modes:
1. initiating a print mode
The ink supply pump 103 starts to work, ink in the ink storage tank 101 is continuously supplied to the ink supply cavity of the secondary ink box 107, meanwhile, the ink return pressure cavity of the air storage tank 201 is regulated to be negative pressure, the ink supply pressure cavity is communicated with the atmosphere, so that ink in the ink supply cavity of the secondary ink box 107 flows into the ink return cavity through the nozzle group 113 until the ink level heights of the ink supply cavity and the ink return cavity are in a set height range, and the pressure in the ink supply pressure cavity and the ink return pressure cavity of the air storage tank 201 are regulated respectively to reach a normal printing state.
2. Normal printing mode
The combination of the ink supply level sensor 109 and the ink supply pump 103 ensures that the ink supply chamber level height is within a set range; the combination of the ink return level sensor 110 and the ink return pump 112 ensures that the ink return chamber level height is within a set range; the ink supply pressure sensor 206, the ink return pressure sensor 207, the air pump one 215, the air pump two 216, the electromagnetic valve one 208, the electromagnetic valve two 209, the electromagnetic valve three 210, the electromagnetic valve four 211 and the electromagnetic valve five 212 are combined to control the pressure in the ink supply pressure cavity and the ink return pressure cavity of the air storage tank 201 to be in proper ranges respectively. By ensuring that the nozzle has sufficient ink and stable pressure, stable ink drop ejection is realized.
3. Stop printing mode
The ink supply pump 103, the ink return pump 112, the air pump one 215 and the air pump two 216 stop working, so that the pressure of the ink supply pressure cavity and the ink return pressure cavity of the air storage tank 201 is consistent, the pressure is constantly kept at a negative pressure value, and the ink in the system does not flow in a circulating way.
The technical means disclosed by the scheme of the invention is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features.
Claims (7)
1. The sand mould additive manufacturing adhesive system ink supply system is characterized by comprising an ink storage tank (101), an ink supply pump (103), a heating rod (104), a filter (105), an ink supply damper (106), a secondary ink box (107), an ink return pump (112), a spray head group (113) and an air storage tank (201); the secondary ink box (107) is communicated with the spray head group (113), the ink return damper (111), the ink return pump (112), the heating rod (104), the filter (105) and the ink supply damper (106) to form a circulation loop; the ink storage tank (101) is communicated with the secondary ink box (107) through an ink supply pump (103), a heating rod (104), a filter (105) and an ink supply damper (106) in sequence; the two chambers of the air storage tank (201) are respectively communicated with the two chambers of the secondary ink box (107) through an ink supply overflow bottle (204) and an ink return overflow bottle (205); the first air pump (215) is communicated with the air storage tank (201) through the fifth electromagnetic valve (212), the fourth electromagnetic valve (211), the first air buffer bottle (213), the first electromagnetic valve (208) and the ink supply pressure sensor (206); the air pump II (216) is communicated with the air storage tank (201) through the air buffer bottle II (214), the electromagnetic valve III (210), the electromagnetic valve II (209) and the ink return pressure sensor (207); wherein the ink inlet and the ink return opening of the spray head group (113) are respectively connected with the secondary ink box (107), and the ink inlet is connected with a temperature sensor (108); the secondary ink box (107) is divided into an independent ink supply cavity and an independent ink return cavity, the two cavities are not communicated with each other, the ink supply cavity is provided with an ink supply liquid level sensor (109), and the ink return cavity is provided with an ink return liquid level sensor (110); the ink supply overflow bottle (204) is used for collecting the ink overflowed from the ink supply cavity in the secondary ink box (107); the ink return overflow bottle (205) is used for collecting the ink overflowed from the ink return cavity in the secondary ink box (107); the air storage tank (201) is divided into an independent ink supply pressure cavity and an independent ink return pressure cavity, the two cavities are not communicated with each other, an ink supply liquid level alarm (202) is arranged in the ink supply pressure cavity, and the internal pressure is monitored by an ink supply pressure sensor (206); the ink return pressure chamber is fitted with an ink return level alarm (203) and the internal pressure is monitored by an ink return pressure sensor (207).
2. The sand additive manufacturing adhesive system ink supply system of claim 1, wherein: an ink storage liquid level sensor (102) is arranged in the ink storage tank (101).
3. The sand additive manufacturing adhesive system ink supply system of claim 1, wherein: the first air pump (215) independently controls the pressure of the ink supply pressure cavity of the air storage tank (201) through the fifth electromagnetic valve (212), the fourth electromagnetic valve (211), the first electromagnetic valve (208) and the second electromagnetic valve (209), or simultaneously controls the pressure of two cavities of the air storage tank (201) or does not control the pressure of the two cavities of the air storage tank (201).
4. The sand additive manufacturing adhesive system ink supply system of claim 1, wherein: the air pump II (216) independently controls the pressure of the ink return pressure cavity of the air storage tank (201) through the electromagnetic valve III (210), the electromagnetic valve II (209) and the electromagnetic valve I (208), or simultaneously controls the pressure of two chambers of the air storage tank (201) or does not control the pressure of the two chambers of the air storage tank (201).
5. The sand additive manufacturing adhesive system ink supply system of claim 1, wherein: the spray head group (113) consists of one or more circulating piezoelectric spray heads, and the spray heads in the spray head group are uniform in height.
6. The method of controlling an ink supply system for a sand additive manufacturing binder system according to claim 1, wherein: the method comprises the following steps:
step 1: the system supplies power, the ink supply system is started, the electromagnetic valve for controlling the air channel is switched on and off according to the actual application condition, the air pump I (215) and the air pump II (216) start to work, and the ink supply pressure cavity and the ink return pressure cavity of the air storage tank (201) reach and maintain the set pressure range through the ink supply pressure sensor (206) and the ink return pressure sensor (207) which feed back and control the air pump I (215) and the air pump II (216);
step 2: the ink supply pump (103) starts to work, ink in the ink storage tank (101) is conveyed to an ink supply cavity of the secondary ink box (107), and the ink is enabled to be at a height of a set range under the control of the ink supply level sensor (109); the ink in the ink supply cavity flows to the ink return cavity through the temperature sensor (108) and the nozzle group (113) under the action of the pressure difference between the ink supply pressure cavity and the ink return pressure cavity of the air storage tank (201); the ink return liquid level sensor (110) controls the ink return pump (112) to pump out the ink in the ink return cavity and circularly convey the ink to the ink supply cavity; the heating rod (104) is started while the ink is conveyed and circulated, the circulated ink starts to be heated until the temperature reaches the set temperature, and when the temperature sensor (108) detects that the ink entering the nozzle group (113) reaches the set temperature, the heating rod (104) stops working;
step 3: when the liquid levels in the ink supply cavity and the ink return cavity of the secondary ink box (107) are in a set height range and the ink temperature reaches a set temperature, the ink supply pressure sensor (206) controls the air pump I (215) to adjust the pressure in the ink supply pressure cavity of the air storage tank (201) to a working pressure range, and the ink return pressure sensor (207) controls the air pump II (216) to adjust the pressure in the ink return pressure cavity of the air storage tank (201) to the working pressure range; at the moment, the ink supply system enters a normal printing state, and the nozzle group (113) can print normally;
step 4: when printing is needed to be suspended or is finished, the first air pump (215) and the second air pump (216) stop working, and the ink supply pressure cavity and the ink return pressure cavity of the air storage tank (201) are communicated and constantly kept at a set negative pressure value; at the same time, the ink supply pump (103), the ink return pump (112), the heating rod (104) and all other detection elements are stopped.
7. The method of controlling an ink supply system for a sand additive manufacturing binder system of claim 6, wherein: when the sensor (102) for storing Mo Yewei in the ink storage tank (101) detects that the ink liquid level is too low, an alarm is given to remind of adding ink; if the existence of the ink is not detected, the ink supply system is forcibly stopped to work, and the ink supply system is in a state of stopping printing until the ink is added and printing is restarted; when any one of the ink supply liquid level alarm (202) and the ink return liquid level alarm (203) in the air storage tank (201) detects that the ink exists, the operation of the ink supply system is stopped immediately until the cleaning of overflowed ink is completed and the ink supply system is restarted.
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