CN110774771A - Oxide content testing assembly of liquid metal ink supply system - Google Patents
Oxide content testing assembly of liquid metal ink supply system Download PDFInfo
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- CN110774771A CN110774771A CN201810856000.XA CN201810856000A CN110774771A CN 110774771 A CN110774771 A CN 110774771A CN 201810856000 A CN201810856000 A CN 201810856000A CN 110774771 A CN110774771 A CN 110774771A
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/20—Ink jet characterised by ink handling for preventing or detecting contamination of compounds
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- Ink Jet (AREA)
Abstract
The invention provides an oxide content testing assembly of a liquid metal ink supply system, which comprises a testing tank, a testing tank cover, a measuring instrument, tested liquid metal and a feedback component, wherein the testing tank cover is arranged on the testing tank cover; the measuring instrument is fixedly arranged on the testing pool cover, the lower end of the measuring instrument is always in contact with the tested liquid metal in the testing pool, and the upper end of the measuring instrument is exposed out of the testing pool cover; the feedback component is fixed at the upper end of the measuring instrument and is connected with an upper computer of the liquid metal ink supply system. By adopting the oxide content testing assembly of the liquid metal ink supply system, the real-time monitoring of the ink supply system and the method can be realized by measuring the content of the oxide.
Description
Technical Field
The invention relates to an oxide content testing assembly of a liquid metal ink supply system, which is mainly applied to the ink supply system of a liquid metal printer.
Background
With the continuous progress of printed electronic technology, conductive fluid represented by liquid metal is generated, so that the manufacture of a liquid metal flexible electronic circuit by printing a lead becomes possible, the traditional PCB (printed circuit board) hard electronic circuit manufacturing mode is changed, and the electronic circuit manufacturing time and cost are greatly reduced. The liquid metal printing technology has the advantage of being unique in the rapid manufacturing of electronic devices such as flexible circuits, PCBs (printed circuit boards), antennas and the like, and has a very wide application prospect.
In the existing liquid metal printing, the liquid metal ink mainly uses the self gravity as the printing driving force, and continuous ink discharging and line printing are realized by depending on the wetting and adhesion of the liquid metal to the substrate material.
However, (1) as the liquid level of the liquid metal ink is continuously reduced, the printing driving force is reduced, the ink amount is reduced, and the widths of printed conductive circuits are inconsistent; (2) the fluidity of the liquid metal is greatly influenced by the temperature, generally becomes better along with the rise of the temperature, otherwise becomes worse, when the temperature of the external environment changes, the fluidity of the liquid metal changes, and the ink output quantity changes; (3) with the lapse of time, the content of oxide in the liquid metal ink is gradually increased, the more the oxide is, the mobility of the liquid metal is deteriorated, and the ink output is also affected; (4) the existing printing mode depending on gravity flow can not accurately control the flow of liquid metal, and the stability of an ink supply system and the consistency of printed line width are difficult to ensure; (5) when printing stops, the gravity of the metal ink can cause the metal ink to leak at the pen point, thereby wasting liquid metal materials and influencing the printing performance.
Thus, existing ink supply systems and methods greatly limit the applicability of conventional liquid metal printing techniques.
Disclosure of Invention
The invention aims to solve the technical problems that the traditional liquid metal printing quality is not stable, the printing line width stability is improved, particularly, an oxide content testing assembly of a liquid metal ink supply system of a printer is improved, and the real-time monitoring of the ink supply system and the method is realized by measuring the oxide content.
In order to solve the technical problems, the invention adopts the technical scheme that:
an oxide content testing assembly of a liquid metal ink supply system comprises a testing tank, a testing tank cover, a measuring instrument, tested liquid metal and a feedback component; the measuring instrument is fixedly arranged on the testing pool cover, the lower end of the measuring instrument is always in contact with the tested liquid metal in the testing pool, and the upper end of the measuring instrument is exposed out of the testing pool cover; the feedback component is fixed at the upper end of the measuring instrument and is connected with an upper computer of the liquid metal ink supply system.
The suction device is fixed on the side wall of the test pool and is connected with a liquid metal ink box of a liquid metal ink supply system through an ink pipe, and liquid metal is sucked from the liquid metal ink box into the test pool.
The feedback part is a feedback circuit which is fixedly connected with the upper end of the measuring instrument and an upper computer of the liquid metal ink supply system and feeds back the measurement value of the measuring instrument.
The feedback component is a wireless signal transmitter which is fixed at the upper end of the measuring instrument and transmits a wireless signal of a measuring value of the measuring instrument, and an upper computer of the liquid metal ink supply system receives the wireless signal.
Wherein the measuring instrument is one of a viscosity measuring instrument, a resistance measuring instrument, a weight measuring instrument, a voltage measuring instrument and a potential measuring instrument.
The measuring value measured by the measuring instrument is fed back to an upper computer of the liquid metal ink supply system through a feedback component, and the upper computer of the ink supply system obtains the mass percent C of the oxide of the measured liquid metal through numerical calculation and conversion.
The fixing mode of the measuring instrument on the testing pool cover is that a threaded hole is punched on the testing pool cover and is matched with a fixing tool on the measuring instrument to realize threaded connection.
The invention has the beneficial effects that:
the content of the liquid metal oxide of the liquid metal ink supply system is detected, and necessary adjustment parameters are provided for an upper computer or other control components of the liquid metal ink supply system, so that the overall printing quality is improved.
Drawings
FIG. 1 is a schematic view of a liquid metal ink supply system of the present invention;
FIG. 2 is a schematic diagram of a method for supplying liquid metal ink according to the present invention;
FIG. 3A is a schematic view of a temperature control assembly of the liquid metal ink supply system of the present invention;
FIG. 3B is a schematic diagram of a method of controlling a temperature control assembly of the liquid metal ink supply system of the present invention;
FIGS. 4A and 4B are schematic diagrams of two embodiments of an oxide content testing assembly of the liquid metal ink supply system of the present invention;
FIG. 5 is a schematic view of a liquid level control assembly of the liquid metal ink supply system of the present invention;
FIG. 6 is a schematic view of a pneumatic control assembly of the liquid metal ink supply system of the present invention;
FIG. 7 is a schematic view of a reducing ink path of the liquid metal ink supply system of the present invention;
reference numerals: 1-gravity sensor, 2-liquid metal cartridge, 3-ink discharge joint, 4-ink supply joint, 5-one-way valve, 6-filter, 7-ink supply pump, 8-ink discharge pump, 9-ink pool, 10-ink tube, 13-negative pressure air pump, 14-positive pressure air pump, 15-pressure stabilizing air bottle, 16-valve block, 17-electromagnetic valve, 18-air tube, 19-air pressure control board, 20-air pressure sensor, 21-control circuit, 22-atmosphere communication port, 24-reduction filter, 25, 28, 33-ink tube, 26, 27-Ruhr joint, 29, 32-pagoda joint, 30-oxide removing solution, 31-reduced liquid metal, 34-joint, 35-printing head, 36. 37, 38, 40, 42-metal knurled joint, 39, 41-pagoda joint, 44-liquid metal ink box cover, 11, 50-testing pool, 12-viscosity measuring instrument, 43-luer joint, 44-liquid metal ink box cover, 47-resistance measuring instrument, 45, 48-testing pool cover, 46, 49-tested liquid metal, 54-heating device, 55-temperature measuring device, 56-refrigerating device and 57-control device.
Detailed Description
The invention is further described below with reference to the figures and examples.
Referring to fig. 1, the embodiment shows a liquid metal ink supply system, which includes a liquid metal ink cartridge 2, a temperature control assembly, a lifetime counting assembly, an oxide testing assembly, a liquid level control assembly, an air pressure control assembly, a reducing ink path, and a print head; the liquid metal ink box 2 is respectively connected with a reducing ink path and an oxide testing component through two different ink tubes and is connected with an air pressure control component through an air tube 18; the ink discharging joint 3 and the ink supplying joint 4 of the liquid level control component are directly connected in the liquid metal ink box 2 and are in direct contact with the liquid metal, and the gravity sensor 1 is connected to the lower surface of the liquid metal ink box 2; the temperature control assembly and the life counting assembly are attached to the outer surface of the liquid metal cartridge 2.
The liquid metal ink box 2 is also provided with a liquid metal ink box cover 44, and the air pipe 18, the ink discharging connector 3 and the ink supplying connector 4 are connected to the liquid metal ink box cover 44. The box cover of the liquid metal ink box ensures the sealing connection of other parts and the box cover, and also ensures the whole disassembly and assembly convenience degree and the sealing performance of the liquid metal ink box.
The used liquid metal is also called low-melting-point metal and comprises a low-melting-point metal simple substance with a melting point below 300 ℃, a low-melting-point metal alloy or conductive nanofluid formed by mixing the liquid metal simple substance/low-melting-point metal alloy, metal nanoparticles and a fluid dispersing agent. More specifically, when the conductive nanofluid is selected, the fluid dispersion agent is preferably one of ethanol, propylene glycol, glycerin, polyvinylpyrrolidone, polydimethylsiloxane, polyethylene glycol, and polymethylmethacrylate. In some embodiments, the low melting point metal alloy composition may include one or more of gallium, indium, tin, zinc, silver, copper, iron, nickel, and the like.
Preferably, the specific selection ranges of the liquid metal include: one or more of simple substance gallium, gallium indium alloy, gallium indium tin alloy, gallium zinc alloy, gallium indium zinc alloy, gallium tin zinc alloy and gallium indium tin zinc alloy.
Two different ink tubes, connecting the reducing ink path and the oxide test assembly, are attached to the side walls of the liquid metal cartridge 2. The position of the ink tube on the side wall can be flexibly set according to the positions of the reduction ink path and the oxide test assembly.
The air pressure control assembly is an electric air pressure source to realize air pressure supply.
The service life counting component is a timing chip and is directly installed on the liquid metal ink box.
Referring to fig. 2, an ink supply method of the ink supply system shown in the embodiment includes:
(1) starting the temperature control assembly, and controlling the working temperature in the liquid metal ink box to be 21-26 ℃;
(2) the service life counting assembly detects whether the liquid metal ink box is in a normal working time state, if the working time exceeds the normal working time, software of an upper computer of the ink supply system prompts a user to replace the ink box, and if the working time does not exceed the normal working time, counting is started;
(3) the oxide content testing component is started, liquid metal in the liquid metal ink box is sucked into the testing pool, the mass percentage C of the oxide is detected, the numerical value is fed back to upper computer equipment of the ink supply system, when the C is larger than 20%, the ink supply system fails, upper computer software prompts a user to replace the ink box, and when the C is smaller than or equal to 20%, the service life counting component starts to count;
(4) the liquid level control component is started to control the liquid level height in the liquid metal ink box to be always within-0.2 mm and h-h
0Not more than 0.2mm, wherein h is the liquid level height, h
0Is a recommended liquid level height;
(5) the air pressure control component is started to control the air pressure in the liquid metal ink box to be in a stable pressure state;
(6) the ink supply system starts ink supply printing.
When the continuous working time of the air pressure control assembly or the liquid level control assembly exceeds 10 minutes, the air pressure or the liquid level in the liquid metal ink box is always in an unstable state, related assembly faults are defaulted, and the upper computer software of the ink supply system prompts system faults of a user.
The normal working time of the service life counting assembly of the ink supply system is 3 months.
The invention limits the ink supply system and the ink supply method of the liquid metal printer, can enable a series of control components to work in sequence, eliminates system faults step by step, ensures the working stability of the ink supply system, and ensures the stability of the liquid metal in the liquid metal ink box by starting each system in sequence so as to improve the printing line width and the printing quality.
The temperature control assembly and the control method thereof are used for ensuring that the printing temperature T of the liquid metal is always at the optimal preset temperature T
0。
Referring to fig. 3A and 3B, the embodiment shows a temperature control method for a temperature control assembly of a liquid metal ink supply system, which adopts a heating device 54, a refrigerating device 56, a temperature measuring device 55 and a control device 57 according to a preset temperature T of liquid metal
0Controlling the printing temperature T of the liquid metal 49 in the liquid metal ink box 2; the heating device 54 and the cooling device 56 are positioned at the bottom of the liquid metal cartridge 2 and are in direct contact with the liquid metal 49; when T is less than T
oWhen T is greater than T, the heating device 54 is started
0When T is T, the refrigeration device 56 is started
0At this time, the temperature control assembly does not operate.
According to the properties of the liquid metal, the temperature T is generally preset
0The temperature control method is carried out by a common PID control device, namely 21-26 ℃.
The heating device 54 and the cooling device 56 are also in a conventional form, and the heating device 54 is any one of a heating rod, a polyimide heating film, and a ceramic heating sheet; the refrigerating device 56 is any one of a semiconductor refrigerating plate, water cooling, and air cooling.
The main purpose of the temperature control method is to control the printing temperature, which is related to the mounting position of the temperature measuring device. Referring to fig. 3A, one way of mounting the temperature measuring device 55 is shown at the bottom of the liquid metal cartridge 2, where the temperature measuring device 55 is in direct contact with the liquid metal 49, T ═ T-
c+ T', where T is the printing temperature, T
cIn order to measure the temperature, T ' is the temperature loss difference between the liquid metal ink cartridge 2 and the print head 35, the measurement mode is indirect temperature measurement, and the printing temperature of the liquid metal in the print head 35 is calculated by measuring the temperature 49 of the liquid metal in the liquid metal ink cartridge 2, wherein T ' is mainly affected by the ambient temperature, and in general, the lower the ambient temperature is, the larger T ' is, and vice versa; another way of mounting the temperature measuring device 55, not shown, is inside the print head 35, in which case the temperature measuring device 55 is likewise in direct contact with the liquid metal, T ═ T
cWherein T is the printing temperature, T
cFor measuring the temperature, this measurement is a direct thermometry, the printing temperature of which is obtained directly by measuring the temperature of the liquid metal in the print head 35. Of the two temperature measurement modes, the indirect temperature measurement mode is not accurate in the direct temperature measurement mode, but the preset temperature T of the liquid metal is higher
0Is a temperature range of 21-26 deg.C, so that the above-mentioned two kinds of materials are mixedTemperature measurement methods may be used.
Regarding the assembly mode in the temperature control assembly, the heating device, the refrigerating device and the temperature measuring device are fixedly connected to the wall of the liquid metal ink box or the wall of the printing head in a threaded or heat-resistant glue bonding mode.
It is worth noting that the temperature control assembly and the control method thereof are used for ensuring that the liquid metal in the liquid metal ink box is always at the proper temperature for printing, so that the ink output amount of the liquid metal is kept stable, and the accurate flow control of an ink supply system is facilitated. If the temperature control assembly is started repeatedly or the continuous working time is too long, the temperature in the liquid metal ink box cannot reach the preset temperature all the time, and the upper computer of the ink supply system may judge that the ink supply system fails and prompt a user to check.
The service life counting assembly is a precondition for ensuring the normal work of the liquid metal ink supply system and ensures that the liquid metal in the ink supply system always has good quality.
The accumulated service time of the liquid metal ink box is generally about three months, each liquid metal ink box is provided with an independent anti-counterfeiting password number, when a user uses a new liquid metal ink box for the first time, the anti-counterfeiting password number needs to be manually input in an operation interface of upper computer software, when the user operates a printer to start printing, printer equipment is in a working mode, the upper computer software of an ink supply system starts timing, and when the equipment runs, the timing is also finished. When the timing reaches three months, the anti-counterfeiting password number is invalid, the upper computer software exits the normal operable interface, and the user is prompted to replace the ink box. In addition, when the oxide content testing component of the liquid metal ink supply system detects that the mass percent C of the oxide in the liquid metal ink box is more than 20%, the service life counting component can also prompt a user to replace the ink box through upper computer software.
The service life counting module board is installed at the bottom of the ink box, and four corners are fixed in a screw fastening mode.
The oxide content testing component realizes the measurement of the mass percent of the oxide in the ink supply system mainly by the following principle: firstly, according to the principle that the viscosity of the liquid metal is increased along with the increase of the oxide in the liquid metal ink box, the mass percent C of the oxide is indirectly converted by measuring the viscosity value of the measured liquid metal; secondly, the mass percentage C of the oxide of the liquid metal is indirectly converted by measuring the resistance value of the measured liquid metal according to the principle that the resistance of the liquid metal is increased along with the increase of the oxide in the liquid metal ink box; thirdly, according to the principle that the weight of the liquid metal is increased along with the increase of the oxide in the liquid metal ink box, the mass percentage C of the oxide is indirectly converted by measuring the mass value of the measured liquid metal; fourthly, according to the principle that the electrical parameters of the same position in the liquid metal can change along with the increase of the oxide in the liquid metal ink box, the mass percent C of the oxide is indirectly converted by measuring the corresponding electrical parameter value in the measured liquid metal. In the principle, the process of converting the measured value into the oxide mass percentage C is completed by an upper computer of the liquid metal ink supply system.
Referring to fig. 3A and 3B, which are two specific embodiments of the present invention, an oxide content testing assembly of a liquid metal ink supply system includes a testing tank 11 or 50, a testing tank cover 45 or 48, a measuring instrument 12 or 47, a tested liquid metal 46 or 49, and a feedback component; the measuring instrument 12 or 47 is fixedly arranged on the testing pool cover 45 or 48, the lower end of the measuring instrument 12 or 47 is always contacted with the tested liquid metal 46 or 49 in the testing pool 11 or 50, and the upper end of the measuring instrument 12 or 47 is exposed out of the testing pool cover 45 or 48; the feedback component is fixed on the upper end of the measuring instrument 12 or 47 and is connected with an upper computer of a liquid metal ink supply system.
The test cell of the oxide content test assembly is actually measured and fed back in real time as data in the liquid metal cartridge 2, the two containers being in communication with each other. The assembly for testing the content of oxides therefore also comprises suction means fixed to the side walls of the test cell 11 or 50 and connected to the cartridge 2 of liquid metal ink of the liquid metal inking system by means of an ink duct, to suck the liquid metal from the cartridge 2 into the test cell 11 or 50.
The feedback component may take a variety of forms. For example, the feedback component is a feedback circuit, the feedback circuit is fixedly connected with the upper end of the measuring instrument 12 or 47 and an upper computer of the liquid metal ink supply system, and the measuring value of the measuring instrument 12 or 47 is fed back. For another example, the feedback component is a wireless signal transmitter, the wireless signal transmitter is fixed on the upper end of the measuring instrument 12 or 47 and transmits a wireless signal of the measured value of the measuring instrument 12 or 47, and an upper computer of the liquid metal ink supply system receives the wireless signal.
The oxide content testing assembly meter may also take a variety of forms. For example, referring to fig. 3A, the measuring instrument in this embodiment is a viscosity measuring instrument 12, and the measurement principle adopted is as follows: according to the principle that the viscosity of the liquid metal is increased along with the increase of the oxide in the liquid metal ink box, the mass percent C of the oxide is indirectly converted by measuring the viscosity value of the measured liquid metal. For another example, referring to fig. 3B, the measuring instrument in this embodiment is a resistance measuring instrument 47, and the measuring principle adopted is as follows: according to the principle that the resistance of the liquid metal is increased along with the increase of the oxide in the liquid metal ink box, the mass percent C of the oxide is indirectly converted by measuring the resistance value of the measured liquid metal. In addition, the measuring instrument may be any one of a weight measuring instrument, a voltage measuring instrument, and a potential measuring instrument.
The measured value measured by the measuring instrument 12 or 47 is fed back to an upper computer of the liquid metal ink supply system through a feedback component, and the upper computer of the ink supply system obtains the mass percent C of the oxide of the measured liquid metal 46 or 49 through numerical calculation and conversion.
The measuring instrument 12 or 47 is fixed on the test pool cover 45 or 48 in a mode that a threaded hole is drilled in the test pool cover 45 or 48 and matched with a fixing tool on the measuring instrument 12 or 47 to realize threaded connection.
The working principle of the liquid level control assembly is that the weight of the whole liquid metal ink box is measured by a gravity sensor, then the corresponding liquid level height is calculated, and then liquid level adjustment is carried out according to the requirement.
Referring to fig. 4, the liquid level control assembly of the liquid metal ink supply system is shown in the specific embodiment, and includes a gravity sensor 1, a liquid metal ink cartridge 2, an ink discharge joint 3, an ink supply joint 4, an ink supply pump 7, an ink discharge pump 8, an ink tank 9, and an ink tube 10; the gravity sensor 1 is positioned below the liquid metal ink box 2; the ink discharging joint 3 and the ink supplying joint 4 are positioned above the liquid metal ink box 2; an ink supply pump 7 and an ink discharge pump 8 are located in the ink tank 9 for supplying and discharging ink to and from the liquid metal ink cartridge 2; an ink tube 10, connected between the ink reservoir 9 and the liquid metal cartridge 2, forms an ink supply channel and an ink discharge channel. In the liquid level control subassembly, there are two interconnect's container, are liquid metal ink horn 2 and ink pool 9 respectively, just implement the control through the liquid level in the liquid metal ink horn 2, import or export liquid metal from ink pool 9, guarantee the continuation and stability of liquid level in the liquid metal ink horn 2.
In order to improve the purity of the liquid metal in the liquid metal cartridge 2, the liquid level control assembly further comprises a check valve 5 and a filter 6, wherein the check valve 5 and the filter 6 are both arranged on an ink supply channel formed by an ink pipe 10 connecting the ink tank 9 and the liquid metal cartridge 2. The positions of the two can be flexibly selected, and after the one-way valve 5 which is convenient to operate is arranged, the filter 6 can be arranged between the one-way valve 5 and the ink supply pump 7 or between the one-way valve 5 and the ink supply joint 4.
The upper part of the liquid metal ink box 2 also comprises a liquid metal ink box cover 44 which is matched with each other to contain liquid metal, and the ink discharging joint 3 and the ink supplying joint 4 are fixed on the liquid metal ink box cover 44 in a flexible mounting and dismounting mode, such as threaded connection.
The gravity sensor 1 is fixed below the liquid metal ink box 2 in an adhesive mode. The gravity sensor 1 is generally not connected to the liquid metal cartridge 2 by means of screw bolts, since the own weight of the screw bolts affects the measurement result of the gravity sensor.
Many sealing connections are used in fluid level control assemblies to ensure assembly and sealing between the various components. Luer fittings 43 are located at both ends of the check valve 5 and the filter 6, and where the ink drain fitting 3 and the ink supply fitting 4 join the outer surface of the liquid metal ink box cover 44. The pagoda joints are located at two junctions of the ink supply pump 7 and the ink discharge pump 8 and the ink tube 10.
The liquid level control assembly is adopted to monitor the liquid level in the liquid metal ink box, so that the quality of the liquid metal in the ink box is guaranteed. The first step of controlling the liquid level height is to obtain the liquid level height, the liquid level control assembly can convert the liquid level height h according to the weight G of the liquid metal ink box 2 measured by the gravity sensor 1 by an upper computer of the ink supply system so as to obtain the liquid level height h in the liquid metal ink box 2 for real-time control; the conversion formula is h ═ G-G
0) Where h is the liquid level height, G is the weight of the liquid metal cartridge 2, G
0ρ is the density of the liquid metal, s is the bottom area of the liquid metal cartridge 2, and g is the acceleration of gravity.
Then, the upper computer of the ink supply system is used for recommending the liquid level height h according to the liquid level height h and the recommended liquid level height h
0The ink supply pump 7 or the ink discharge pump 8 is controlled to work; when h-h
0When the thickness is less than-0.2 mm, the liquid metal ink box 2 is in an ink shortage state, and an upper computer of the ink supply system starts an ink supply pump 7 to convey liquid metal into the liquid metal ink box 2; when h-h
0When the thickness is larger than 0.2mm, the liquid metal ink box 2 is in an ink overflow state, and an upper computer of the ink supply system starts an ink discharge pump 8 to output liquid metal from the liquid metal ink box 2; when the thickness of the steel is less than or equal to-0.2 mm, h-h
0When the diameter is less than or equal to 0.2mm, the liquid metal ink box 2 is in a normal working state, and the liquid level control assembly does not work.
Notably, liquid metal inks of different compositions have different recommended level heights h
0The liquid level control assembly is used for ensuring that the liquid metal in the liquid metal ink box is always at a proper height convenient for printing, so that the self gravity of the liquid metal is kept constant, and the accurate flow control of an ink supply system is facilitated. If the liquid level control assembly is started repeatedly or the continuous working time is too long, the liquid level in the liquid metal ink box can not reach the recommended height all the time, and an upper computer of the ink supply system can judge that the liquid metal ink box is in failure and prompt a user to check.
The air pressure control component is used for accurately adjusting the pressure inside the liquid metal ink box, and the traditional printer ink supply system is not provided with the air pressure control component.
Referring to fig. 5, in the embodiment, an air pressure control assembly of a liquid metal ink supply system is shown, which includes a negative pressure air pump 13, a positive pressure air pump 14, a pressure stabilizing air bottle 15, a valve block 16, an air pressure control board 19, an air pipe 18 and a control circuit 21; the valve block 16 is connected to the liquid metal cartridge 2 of the ink supply system by a gas pipe 18; the negative pressure air pump 13, the positive pressure air pump 14 and the pressure stabilizing air bottle 15 are respectively connected to the valve block 16 through air pipes 18; the air pressure control board 19 is connected with and controls the negative pressure air pump 13 and the positive pressure air pump 14 through the control circuit 21.
In the air pressure control assembly, the negative pressure air pump 13, the positive pressure air pump 14 and the pressure stabilizing air bottle 15 are used for adjusting the air pressure in the liquid metal ink box 2, and the valve block 16 plays a role in overall adjustment control, and the control of each component is realized through the control circuit 21.
The valve block 16 of the air pressure control assembly further comprises an atmosphere communication port 22, an air pressure sensor 20 and an electromagnetic valve 17, wherein the atmosphere communication port 22 enables the interior of the valve block 16 to be communicated with the atmosphere; an air pressure sensor 20 connected to the valve block 16 through an air pipe 18, for measuring the air pressure of the valve block 16; the electromagnetic valves 17 are located inside the valve block 16, and are respectively disposed at the air pipe 18 connected to the liquid metal cartridge 2 and at the atmosphere connection port 22 by means of screw connection.
It can be seen that the air pressure of the valve block 16 has a certain relationship with the air pressure of the liquid metal ink cartridge 2, and needs to be measured by the air pressure sensor 20, each part of the air pressure control assembly is mainly connected and transmits the air pressure through the air pipe 18, and the two electromagnetic valves 17 are connected inside the valve block 16 and respectively connected and respectively controlled.
The connection between the air pressure control components is mainly completed by metal knurled joints 37, 38, 40 and 42 and pagoda joints 39 and 41, the joints of the outside of the valve block 16 and the air pipe 18 are in threaded sealing connection by the metal knurled joints 37, 38 and 40, and the joint of the pressure stabilizing air bottle 15 and the air pipe 18 is also in threaded sealing connection by the metal knurled joint 42; the pagoda joints 39 and 41 are respectively positioned on the negative pressure air pump 13, the positive pressure air pump 14 and the air pressure sensor 20 and are connected with the air pipe 18 in a sealing way. The metal knurled joint or the pagoda joint is selected on the basis of ensuring the sealing connection of parts, the premise of convenient disassembly and maintenance is ensured, different connecting pieces are selected according to different conveying and connecting materials, and the oxidation property of the liquid metal and the related property of the conveyed substance are fully considered.
The pneumatic control assembly also includes a battery connected to the control circuit 21. The pneumatic control assembly is still effective when the equipment is powered off, and the leakage of the printing head is prevented.
The air pressure control method of the air pressure control assembly in the specific embodiment of the invention mainly utilizes an upper computer of an ink supply system to convert the air pressure so as to obtain the air pressure P in the liquid metal ink box 2 for real-time control; the conversion formula is (G- γ C-f)/s, where P is air pressure, G is the weight of the liquid metal ink cartridge 2, γ is the simulation coefficient, C is the mass percent of the oxide, f is the resistance in the ink supply system, and s is the bottom area of the liquid metal ink cartridge 2. It can be seen that the value of the pressure value P is related to the height h of the liquid level in the liquid metal ink cartridge 2 and the mass percent C of the oxide, and the control components in the entire liquid metal ink supply system are cooperatively and jointly controlled.
In the printing process, an upper computer of the ink supply system controls the negative pressure air pump 13 or the positive pressure air pump 14 to work according to the printing requirement; when the printing is ready to be started, an upper computer of the ink supply system starts the positive pressure air pump 14 to apply positive pressure to the liquid metal ink box to provide driving force for the liquid metal, and when G-gamma C-f is less than or equal to 0, P is more than or equal to 0; when the printing is ready to be stopped, the upper computer of the ink supply system starts the negative pressure air pump 13 to apply negative pressure to the liquid metal ink box, and balance force is given to the liquid metal, wherein G-gamma C-f is larger than 0, and P is smaller than 0.
It is worth noting that the liquid metal is too heavy due to the self weight, when the liquid level height reaches a certain height, the liquid metal can leak downwards even if the positive pressure is not supplied and only the atmosphere is communicated, so that the air pressure control assembly is required to supply a negative pressure to the inside of the liquid metal ink box to balance the weight of the liquid metal and prevent leakage, and the principle that the negative pressure is supplied to the liquid metal ink box when printing is about to stop is that the negative pressure is communicated, so that the liquid metal in the printing head is recovered and does not leak; on the other hand, when the liquid level of the liquid metal is lower than a certain value, although the liquid metal is heavy, the surface tension is so large that the liquid metal cannot smoothly enter the printing head through the self weight, and at this time, the air pressure control assembly is required to give positive pressure to the liquid metal to push the liquid metal to flow downwards and print.
The numerical range of the air pressure inside the liquid metal ink box 2 controlled by the air pressure control method in the printing process is-9 kPa-9 kPa.
The reducing ink path is a channel connected between the liquid metal ink box and the printing head, and has the main functions of removing oxide impurities in the liquid metal, ensuring that the liquid metal communicated to the printing head does not contain oxides basically, preventing oxide particles from blocking the printing head and ensuring the printing quality.
Referring to fig. 7, the embodiment shows a reducing ink path of a liquid metal ink supply system, which includes ink tubes 25, 28, 33, a reducing filter 24 and a printing head 35; the ink tubes 25, 28, 33 connect the liquid metal cartridge 2 and the print head 35 to form an ink path; the reducing filter 24 is connected to the ink path and has a chamber containing an oxide removal solution 30 so that oxides in the liquid metal flowing through the reducing filter 24 to the printhead 35 are reduced.
The reducing ink circuit also comprises a non-return valve 23 connected to the ink circuit between the liquid metal cartridge 2 and the reducing filter 24, or directly at the inlet of the reducing filter 24. The function of the check valve is to prevent the liquid metal from flowing back, and the two modes can be correspondingly arranged according to the length of the ink path, and have no difference in function.
However, the position at which the check valve 23 is provided has some influence on the selection of the connections of the check valve 23 and the reducing filter 24 to the ink tubes. When the check valve 23 is connected between the liquid metal cartridge 2 and the reducing filter 24, the check valve 23 and the reducing filter 24 are provided with an inlet and an outlet, in which case, luer joints 26 and 27 are used to hermetically connect the inlet and the outlet of the check valve 23 with the ink tubes 25 and 28, and pagoda joints 29 and 32 are used to hermetically connect the inlet and the outlet of the reducing filter 24 with the ink tubes 28 and 33. When the check valve 23 is directly connected to the inlet of the reducing filter 24, the check valve 23 has an inlet without an outlet, and the reducing filter 24 has an outlet without an inlet, in this case, the inlet of the check valve 23 is hermetically connected to the ink tube 25 by a luer connector, and the outlet of the reducing filter 24 is hermetically connected to the ink tube 33 by a pagoda connector.
The joint of the printing head 35 of the ink recovery path and the ink tube 33 is connected in a screw thread sealing way by a knurling joint 34.
In the above connection, the ink tubes 25, 28, 33, the luer fittings 26, 27, the pagoda fittings 29, 32, and the knurled fitting 34 are all made of plastic. The plastic connector is characterized by being impermeable to oxygen and non-reactive with the liquid metal to ensure the stability of the liquid metal.
The oxide-removing solution 30 in the reduction filter 24 is NaOH, HCL, H
2sO
4And one of KOH solution, the volume of which is not more than 40 percent of the volume of the cavity, and the concentration of which is 0.05mol/L-0.5 mol/L. Since the density of the oxide removing solution 30 is much lower than that of the liquid metal, the oxide removing solution 30 is always on the upper surface of the reduced liquid metal 31 in the chamber, and the reduced liquid metal 31 sinks to the lower part of the chamber.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (7)
1. An oxide content test subassembly of liquid metal ink supply system which characterized in that:
comprises a test cell (11, 50), a test cell cover (45, 48), a measuring instrument (12, 47), a tested liquid metal (46, 49) and a feedback component;
the measuring instrument (12, 47) is fixedly arranged on a testing pool cover (45, 48), the lower end of the measuring instrument (12, 47) is always contacted with the tested liquid metal (46, 49) in the testing pool (11, 50), and the upper end of the measuring instrument (12, 47) is exposed out of the testing pool cover (45, 48);
the feedback component is fixed at the upper end of the measuring instrument (12, 47) and is connected with an upper computer of a liquid metal ink supply system.
2. The oxide content testing assembly of claim 1, wherein:
the device also comprises a suction device which is fixed on the side wall of the test pool (11, 50) and is connected with a liquid metal ink box (2) of a liquid metal ink supply system through an ink pipe, and liquid metal is sucked into the test pool (11, 50) from the liquid metal ink box (2).
3. The oxide content testing assembly of claim 1, wherein:
the feedback component is a feedback circuit which is fixedly connected with the upper end of the measuring instrument (12, 47) and an upper computer of the liquid metal ink supply system and feeds back the measured value of the measuring instrument (12, 47).
4. The oxide content testing assembly of claim 1, wherein:
the feedback component is a wireless signal transmitter which is fixed at the upper end of the measuring instrument (12, 47) and transmits a wireless signal of a measuring value of the measuring instrument (12, 47), and an upper computer of the liquid metal ink supply system receives the wireless signal.
5. The oxide content testing assembly of any one of claims 1-4, wherein:
the measuring instrument is one of a viscosity measuring instrument (12), a resistance measuring instrument (47), a weight measuring instrument, a voltage measuring instrument and a potential measuring instrument.
6. The oxide content testing assembly of claim 5, wherein:
the measured values measured by the measuring instruments (12, 47) are fed back to an upper computer of the liquid metal ink supply system through the feedback component, and the upper computer of the ink supply system obtains the mass percent C of the oxide of the measured liquid metal (46, 49) through numerical calculation and conversion.
7. The oxide content testing assembly of claim 1, wherein:
the measuring instrument (12, 47) is fixed on the testing pool cover (45, 48) in a mode that threaded holes are punched in the testing pool cover (45, 48) and matched with a fixing tool on the measuring instrument (12, 47) to realize threaded connection.
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