Pressure regulating and circulating ink supply system

Abstract

The utility model relates to the technical field of ink-jet printing equipment, in particular to a pressure regulating and circulating ink supply system which comprises a circulating ink supply system and a pressure regulating system, the circulating ink supply system comprises a main ink box, a secondary ink box, a secondary heating ink box and a spray head, the secondary ink box is communicated with the main ink box through an ink supply pipeline, a liquid supply diaphragm liquid pump is arranged on the ink supply pipeline, and the secondary heating ink box is communicated with the spray head. The secondary heating ink box is communicated with the secondary ink box through a first ink inlet pipeline, an ink inlet of the nozzle is communicated with the secondary heating ink box through a second ink inlet pipeline, the circulating ink box is communicated with an ink outlet of the nozzle through a first ink return pipeline, and the circulating ink box is communicated with the secondary ink box through a second ink return pipeline. A circulating diaphragm liquid pump is arranged on the second ink return pipeline; fluid pressure and temperature detection elements are respectively arranged at an ink inlet and an ink outlet of the nozzle; and the secondary ink box and the circulating ink box are respectively provided with a pressure regulating system. The pressure regulating and circulating ink supply system solves the problems that an existing ink path is poor in ink jet effect, and the complexity of a multi-nozzle array is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to inkjet printing equipment technical field, concretely relates to a kind of pressure regulating and circulating ink supply system. BACKGROUND

[0002] With the increasing diversification of market demand, digital printing technology has been rapid development and wide application.In the inkjet printing / field, ink supply system plays a vital role.The traditional ink supply system supplies ink to the nozzle, and generates a specific negative pressure at the nozzle orifice, to ensure that the ink does not drip out.However, the negative pressure at the nozzle orifice needs to be precisely controlled: too large negative pressure may cause air to be sucked into the nozzle, and thus cause pressure instability in the ink path, damaging the printing quality;while too small negative pressure may cause ink droplets to flow out without being triggered by voltage, resulting in loss of control of ink droplets.

[0003] In addition, the relative position of the nozzle and the ink cartridge also has a significant impact on printing effect.In order to achieve appropriate printing pressure, the nozzle and the ink cartridge must be maintained within a reasonable height range.Once this height range is exceeded, it may affect the overall structure size, and even adversely affect the printing quality.

[0004] However, the current ink supply system has many shortcomings.Firstly, the design of circulating ink path is not perfect, resulting in large fluctuations in ink supply pressure, which in turn affects the inkjet effect of the nozzle.Secondly, the control of ink flow rate is not accurate, and the ink is prone to sedimentation, which not only may cause nozzle clogging, but also may affect the normal work of the nozzle.Therefore, how to provide a more reasonable and effective pressure regulating and circulating ink path has become a problem to be solved in the field of inkjet printing technology.

[0005] In view of the above problems, the existing ink supply system urgently needs an innovative technical solution to achieve more stable and accurate ink supply and pressure regulating control.This technical solution not only needs to solve the problems of ink pressure fluctuation and flow rate control, but also needs to consider the modularization and miniaturization design of the system, to adapt to different scales and complexity of printing requirements. SUMMARY

[0006] In order to solve the above problems, the utility model provides a kind of pressure regulating and circulating ink supply system, the pressure regulating and circulating ink supply system is at the inlet and outlet of inkjet head double side respectively set ink cartridge, pressure regulating system respectively to each ink cartridge output positive and negative gas pressure, differential pressure and ink circulation control are realized in combination with containing liquid pump ink supply pipeline and containing circulating liquid pump circulating pipeline;Inkjet head double side liquid pressure and temperature sensor, ink cartridge float, gas pressure and temperature sensor provide system feedback data for controller;Each liquid, gas diaphragm pump is provided with direct-current brushless motor, can real-time speed regulation work.Therefore, relatively more stable gas pressure and ink flow can be provided, while guaranteeing the good printing quality of inkjet head, ink path system structure is more compact, and the complexity of multiple inkjet head array is reduced.

[0007] The technical scheme of the utility model is as follows:

[0008] A kind of pressure regulating and circulating ink supply system, including circulating ink supply system and pressure regulating system, circulating ink supply system includes main ink cartridge, secondary ink cartridge, two-stage heating ink cartridge and inkjet head, main ink cartridge provides source for ink, secondary ink cartridge is communicated with main ink cartridge by ink supply pipeline, liquid supply diaphragm liquid pump is arranged on ink supply pipeline, two-stage heating ink cartridge is communicated with secondary ink cartridge by first ink inlet pipeline, the ink inlet of inkjet head is communicated with two-stage heating ink cartridge by second ink inlet pipeline, circulating ink cartridge is communicated with the ink outlet of inkjet head by first ink return pipeline, circulating ink cartridge is communicated with secondary ink cartridge by second ink return pipeline, circulating diaphragm liquid pump is arranged on second ink return pipeline, fluid pressure and temperature detection element are respectively arranged on the ink inlet and ink outlet of inkjet head;One set of pressure regulating system is respectively arranged on secondary ink cartridge and circulating ink cartridge.

[0009] Pressure regulating system includes secondary ink cartridge pressure regulating system and circulating ink cartridge pressure regulating system;

[0010] Secondary ink cartridge pressure regulating system includes secondary anti-ink back ink cartridge, secondary gas storage tank and secondary diaphragm gas pump, four interfaces are arranged on secondary gas storage tank, suction interface of secondary diaphragm gas pump is connected with the first interface of secondary gas storage tank, lift interface of secondary diaphragm gas pump is communicated with atmosphere, the second interface of secondary gas storage tank is communicated with atmosphere by secondary needle valve, the third interface of secondary gas storage tank is connected with gas pressure and temperature detection element, one interface of secondary anti-ink back ink cartridge is communicated with the fourth interface of secondary gas storage tank and positive pressure gas source respectively by electromagnetic reversing valve, float liquid level meter is arranged in secondary anti-ink back ink cartridge, another interface of secondary anti-ink back ink cartridge is communicated with secondary ink cartridge;

[0011] The circulating ink tank pressure regulating system comprises a circulating anti-inverted ink tank, a circulating air storage tank and a circulating diaphragm air pump, four interfaces are arranged on the circulating air storage tank, a suction interface of the circulating diaphragm air pump is connected with a first interface of the circulating air storage tank, a lift interface of the circulating diaphragm air pump is communicated with the atmosphere, a second interface of the circulating air storage tank is communicated with the atmosphere through a circulating needle valve, a third interface of the circulating air storage tank is connected with a gas pressure and temperature detection element, one interface of the circulating anti-inverted ink tank is communicated with a fourth interface of the circulating air storage tank, a float liquid level meter is arranged in the circulating anti-inverted ink tank, and the other interface of the circulating anti-inverted ink tank is communicated with the circulating ink tank.

[0012] The ink supply pipeline is sequentially provided with a liquid supply check valve, a liquid supply filter, a liquid supply diaphragm pump and a liquid supply fluid pulsation damper from the side close to the main ink tank.

[0013] The secondary heating ink tank is internally provided with a heating element and a temperature measuring element.

[0014] A circulating fluid pulsation damper is further arranged on the second ink return pipeline and is arranged behind the circulating diaphragm pump.

[0015] The electromagnetic reversing valve is a secondary two-position three-way electromagnetic valve.

[0016] The second interface of the secondary air storage tank is further communicated with the atmosphere through a secondary needle valve and a secondary gas filter; and the second interface of the circulating air storage tank is further communicated with the atmosphere through a circulating needle valve and a circulating gas filter.

[0017] The fluid pressure and temperature detection elements of the ink inlet and the ink outlet of the nozzle are a nozzle inlet fluid pressure and temperature sensor and a nozzle outlet fluid pressure and temperature sensor respectively, and the gas pressure and temperature detection elements connected with the secondary air storage tank and the circulating air storage tank are a secondary gas pressure and temperature sensor and a circulating gas pressure and temperature sensor respectively.

[0018] The nozzle inlet fluid pressure and temperature sensor, the nozzle outlet fluid pressure and temperature sensor, the secondary gas pressure and temperature sensor and the circulating gas pressure and temperature sensor are all circuit board mounted digital output OEM pressure sensors.

[0019] The secondary ink tank and the secondary heating ink tank are provided with multiple interfaces.

[0020] The beneficial effects of the utility model lie in:

[0021] 1. The utility model discloses a kind of pressure regulating and circulating ink supply systems, the pressure regulating and circulating ink supply system significantly improves the real-time of pressure regulating and precision, enhances the stability of the pressure difference of double side of nozzle;By the synergistic work of multistage ink box, pressure regulating module, prevent ink assembly and controller etc.

[0022] 2, The utility model discloses a kind of pressure regulating and circulating ink supply systems, the pressure regulating and circulating ink supply system optimizes the design of circulating ink path, by setting ink supply pipeline, ink inlet pipeline and ink return pipeline, realize the continuous circulation of ink, effectively prevent the phenomenon of ink deposition and block nozzle;Meanwhile, each liquid, gas diaphragm pump adopts direct-current brushless motor, and has real-time speed regulation function, further improve the flexibility and stability of system.

[0023] 3, The utility model discloses a kind of pressure regulating and circulating ink supply systems, the pressure regulating and circulating ink supply system has excellent hardware structure optimization and multiple nozzle expandability. By providing multiple interfaces and combined design, the system can easily realize the construction of multiple nozzle array, to meet the printing demand of larger range;Not only simplify the structure of system, reduce complexity, also improve the reliability and maintainability of system. BRIEF DESCRIPTION OF DRAWINGS

[0024] The scheme and advantages of the present application will become clear to those skilled in the art from the following detailed description of the preferred embodiments. The accompanying drawings are merely intended to illustrate the preferred embodiments, and are not considered as limiting the utility model.

[0025] In the drawings:

[0026] Figure 1 It is the component schematic diagram of a kind of pressure regulating and circulating ink supply systems of the utility model embodiment;

[0027] Figure 2 It is the working flow chart of the ink supply system of a kind of pressure regulating and circulating ink supply systems of the utility model embodiment;

[0028] Figure 3 It is the working flow chart of the pressure regulating system of a kind of pressure regulating and circulating ink supply systems of the utility model embodiment;

[0029] The components represented by each reference numeral in the drawings are:

[0030] The utility model discloses: 1, primary ink box, 2, secondary ink box, 3, two stage heating ink box, 4, circulating ink box, 5, liquid supply check valve, 6, liquid supply filter, 7, liquid supply diaphragm liquid pump, 8, liquid supply fluid pulsation damper, 9, spray head, 10, circulating diaphragm liquid pump, 11, circulating fluid pulsation damper, 12, secondary anti-inverted ink ink box, 13, secondary gas storage gas tank, 14, secondary diaphragm gas pump, 15, secondary needle valve, 16, secondary gas filter, 17, secondary gas pressure and temperature sensor, 18, secondary two-position three-way electromagnetic valve, 19, positive pressure gas source, 20, circulating anti-inverted ink ink box, 21, circulating gas storage gas tank, 22, circulating diaphragm gas pump, 23, circulating needle valve, 24, circulating gas filter, 25, circulating gas pressure and temperature sensor, 26, spray head inlet fluid pressure and temperature sensor, 27, spray head outlet fluid pressure and temperature sensor. DETAILED DESCRIPTION

[0031] As Figure 1 The pressure regulating and circulating ink supply system comprises a pressure regulating system and a circulating ink supply system.

[0032] The pressure regulating system comprises: a multi-stage ink box connected to a circulating piezoelectric spray head, a pressure regulating module comprising a pressure regulating pipeline connected to the multi-stage ink box and a pressure regulating device connected to the pressure regulating pipeline, and an anti-inverted ink assembly interposed between the multi-stage ink box and the pressure regulating module for indicating an ink backflow position and triggering an inverted ink warning. The controller is used for detecting the liquid level of the multi-stage ink box and the state of the spray head and controlling the pressure regulating device to adjust the positive and negative pressure of the pressure regulating pipeline.

[0033] The circulating ink supply system comprises a series of components for supplying ink and is connected to the aforementioned pressure regulating system.

[0034] The ink flow direction is indicated by the solid arrows in the figure. The circulating ink supply system comprises a primary ink box 1, a secondary ink box 2, a two-stage heating ink box 3, a circulating ink box 4 and a spray head 9. The primary ink box 1 provides a source of ink. An ink supply pipeline is arranged between the primary ink box 1 and the secondary ink box 2. The secondary ink box 2 is directly provided with a first ink inlet pipeline. A second ink inlet pipeline is arranged between the two-stage heating ink box 3 and the ink inlet of the spray head 9. A first ink return pipeline is arranged between the circulating ink box 4 and the ink outlet of the spray head 9. A second ink return pipeline is arranged between the circulating ink box 4 and the secondary ink box 2. The ink inlet pipeline and the ink return pipeline are connected in series to form a circulating ink supply pipeline.

[0035] On the ink supply pipeline, a liquid supply check valve 5, a liquid supply filter 6, a liquid supply diaphragm liquid pump 7 and a liquid supply fluid pulsation damper 8 are arranged in sequence from the end close to the primary ink box 1. The suction side of the liquid supply diaphragm liquid pump 7 is connected to the outlet side of the liquid supply filter 6, and the delivery side is connected to the inlet side of the liquid supply fluid pulsation damper 8.

[0036] The secondary ink cartridge 2 is provided with a float liquid level meter for monitoring the liquid level state, and the secondary heating ink cartridge 3 is provided with a heating rod and a thermocouple assembly for adjusting the ink temperature.

[0037] The main ink cartridge 1 is used for storing the ink required by the system circulation.

[0038] The liquid supply one-way valve 5 is used for realizing the one-way inflow of the ink in the main ink cartridge 1, preventing the backflow.

[0039] The liquid supply filter 6 is used for filtering the impurities and particles in the ink flowing from the main ink cartridge 1, preventing these impurities and particles from entering the nozzle 9 and blocking the nozzle hole of the nozzle 9.

[0040] The liquid supply diaphragm liquid pump 7 is a brushless DC motor pump, and its opening and closing are affected by the state of the float liquid level meter of the secondary ink cartridge 2. When the liquid level is low, it is started, and vice versa, and the liquid supply diaphragm liquid pump 7 can be speed-adjusted.

[0041] The liquid supply fluid pulsation damper 8 is used for further reducing the fluid pulsation of the ink pumped out by the liquid supply diaphragm liquid pump 7, ensuring the stable pressure of the ink entering the secondary ink cartridge 2.

[0042] The nozzle inlet fluid pressure and temperature sensor 26 is arranged on the ink inlet pipeline, close to the inlet side of the nozzle 9.

[0043] The nozzle inlet fluid pressure and temperature sensor 26 is connected with the ink inlet pipeline through a three-way interface, and can monitor the pressure and temperature of the ink flowing into the nozzle.

[0044] The nozzle outlet fluid pressure and temperature sensor 27 is arranged on the ink return pipeline, close to the outlet side of the nozzle 9, and the circulation diaphragm liquid pump 10 and the circulation fluid pulsation damper 11 are arranged in sequence from the end close to the circulation ink cartridge 4. The suction side of the circulation diaphragm liquid pump 10 is connected with the ink outlet of the circulation ink cartridge 4, and the head side is connected with the inlet side of the circulation fluid pulsation damper 11.

[0045] The nozzle outlet fluid pressure and temperature sensor 27 is connected with the ink outlet pipeline through a three-way interface, and can monitor the pressure and temperature of the ink flowing out of the nozzle.

[0046] The circulation ink cartridge 4 is provided with a float liquid level meter for monitoring the liquid level state.

[0047] The circulation diaphragm liquid pump 10 is a brushless DC motor pump, and its opening and closing / rotation speed are affected by the state of the float liquid level meter of the circulation ink cartridge 4 and the pressure state of the nozzle (double-sided sensor data). According to the state, it adjusts its different rotation speeds to control the ink return speed.

[0048] The circulating fluid pulsation damper 11 is used to further reduce the fluid pulsation of the ink pumped by the circulating diaphragm liquid pump 10, and ensure the stability of the ink flow rate into the secondary ink cartridge 2.

[0049] The ink supply pipeline and the ink return pipeline can be wrapped with a heat preservation strip to further reduce temperature loss.

[0050] As shown in Figure 1 The arrayable pressure regulating system provided by the embodiment of the application has the modular installation feature, and performs one-to-one pressure regulating processing on each ink cartridge (except the primary ink cartridge 1 and the secondary heated ink cartridge 3). The dashed line in the figure represents the gas flow direction. Taking the pressure regulating system above the circulating ink cartridge 4 as an example, the main structure thereof includes a circulating gas storage tank 21, a circulating diaphragm gas pump 22, a circulating needle valve 23, a circulating gas filter 24, a circulating gas pressure and temperature sensor 25, and a circulating anti-ink reverse cartridge 20. The pressure regulating system above the secondary ink cartridge 2 is similar to the above, but in order to meet the ink pressure requirement, a two-position three-way electromagnetic valve 18 and a positive pressure gas source 19 are arranged between the secondary anti-ink reverse cartridge 12 and the secondary gas storage tank 13.

[0051] The anti-ink reverse cartridge 12 and the anti-ink reverse cartridge 20 are both internally provided with a float liquid level meter, which can monitor the ink reverse liquid level state, so as to avoid the reverse ink from flowing into the gas storage tank and other devices.

[0052] The secondary gas storage tank 13 and the circulating gas storage tank 21 have the same specification, and both provide four completely same output interfaces made of stainless steel.

[0053] The suction interface of the secondary diaphragm gas pump 14 is connected with one interface provided by the secondary gas storage tank 13, and the lift interface of the secondary diaphragm gas pump 14 is connected with the atmosphere (or a gas filter can be arranged), so as to form a gas negative pressure in the secondary gas storage tank 13. The connection of the circulating diaphragm gas pump 22 and the gas storage tank 21 is the same.

[0054] The secondary diaphragm gas pump 14 and the circulating diaphragm gas pump 22 are both brushless DC motor pumps, which can be speed-regulated. The system uses a PID algorithm to perform real-time setting of the gas pressure and adjustment of the gas pump speed, so as to ensure the accuracy and real-time performance of the pressure regulation.

[0055] The gas inlet of the secondary needle valve 15 is connected with another interface provided by the secondary gas storage tank 13, and the gas outlet of the secondary needle valve 15 is connected with the secondary gas filter 16. The secondary needle valve 15 can be adjusted in gears to adapt to different pressure interval requirements. The connection of the circulating needle valve 23, the circulating gas filter 24, and the circulating gas storage tank 21 is the same.

[0056] The secondary gas pressure and temperature sensor 17 is connected with another interface provided by the secondary gas tank 13, and can monitor the secondary gas tank gas supply pressure and temperature to provide real-time calculation basis for the controller PID algorithm; the circulating gas pressure and temperature sensor 25 is connected with the gas tank 21 in the same way.

[0057] The two-position three-way electromagnetic valve 18 includes two input interfaces and an output interface, one of which is connected with the last interface provided by the secondary gas tank 13, and the other is connected with the positive pressure gas source 19. In the non-energized state, the system is in the normal pressure control state, and the two-position three-way electromagnetic valve 18 normally outputs the negative pressure (or other) in the gas tank to the air inlet of the secondary anti-ink back cartridge 12; in the energized state, the system is in the ink pressure adjustment state, and the output interface of the two-position three-way electromagnetic valve 18 is also connected with the air inlet of the secondary anti-ink back cartridge 12, and outputs the positive pressure provided by the positive pressure gas source 19.

[0058] As shown in Figure 2 and Figure 3 , the working process of the pressure regulating and circulating ink supply system is introduced:

[0059] The system is self-checked after starting, usually, the pressure regulating part is in the closed state (including the diaphragm gas pump and the electromagnetic valve), the liquid level of each cartridge containing the float should be kept at the minimum state, and the values of each liquid and gas pressure and temperature sensor should be or approximately close to 0. This state is called the initial state. In this state, the controller starts the ink supply diaphragm liquid pump 7 (at a certain speed), the ink flows into the secondary cartridge 2 through the ink supply pipeline, and then flows through the secondary heating cartridge 3, the inkjet head inlet side liquid pressure and temperature sensor and the inkjet head 9 along the ink inlet pipeline. When the liquid level in the secondary cartridge 2 rises to the full liquid level state, the secondary pressure regulating system is started with the set secondary negative pressure initial value P0, and the secondary diaphragm gas pump 14 starts to work (at the corresponding PID algorithm output speed). During this period, the ink supply diaphragm liquid pump 7 is closed and opened (at the aforementioned certain speed) corresponding to the high and low liquid levels of the secondary cartridge 2, until the pressure difference between the inkjet head inlet liquid pressure and temperature sensor 26 and the inkjet head outlet liquid pressure and temperature sensor 27 is approximately 0, and the initial state control is completed.

[0060] After the initial state is completed, the circulating state is entered, and the controller starts the pressure regulating system above the circulating cartridge 4, which specifically includes reducing the secondary negative pressure P0, setting the circulating negative pressure initial value P1, and starting the circulating diaphragm gas pump 22 (at the corresponding PID algorithm output speed) to attract the ink to flow into the circulating cartridge 4 along the ink return pipeline until the liquid level is full. Subsequently, the circulating diaphragm liquid pump 10 in the ink return pipeline is started (at a certain initial speed), and its opening / closing / speed is set in real time according to the liquid level state of the circulating cartridge 4 and the pressure state of the inkjet head (the data of the two sensors), and correspondingly, the secondary negative pressure P0 is continuously reduced and the circulating negative pressure P1 is increased to ensure the continuous circulation of the ink in the whole system. Thus, the circulating state control is completed.

[0061] In addition, the system supports ink pressing operation to remove air bubbles contained in the ink channel inside the nozzle 9, and to ensure that each nozzle hole of the nozzle 9 can normally spray ink. This state is called ink pressing state. In this state, the controller opens the two-position three-way electromagnetic valve 18, so that the air pressure received by the secondary ink box 2 is switched to the positive pressure air source, and the pressure regulating system above the circulating ink box 4 is not changed. According to the set ink pressing duration T0, the ink pressing process is carried out, and the nozzle hole plate at the bottom of the nozzle 9 presents the expected dense droplet arrangement state. After the T0 time ends, the two-position three-way electromagnetic valve 18 is in a closed state, and the air source is switched to the secondary gas storage tank 13. The system enters the circulating state.

[0062] During the ink spraying process of the nozzle 9, as the ink is sprayed from the nozzle hole of the nozzle 9, the ink in the secondary ink box 1 will gradually decrease (but the consumption is usually small). When the liquid level is lowered to the low liquid level state, the diaphragm liquid pump 7 will be opened again.

[0063] In particular, when the pressure regulating and circulating ink supply system is running in the ink spraying process or other states, if a short power failure operation occurs suddenly or the diaphragm pump stops working completely or partially due to other reasons, the controller will be forced to produce a reset operation, but the controller data stored in the built-in memory can continue the previous normal regulation state.

[0064] In addition, when the anti-ink reverse ink box occurs ink reverse (the liquid level is high), in the initial state, if the secondary anti-ink reverse ink box 12 occurs ink reverse, the ink supply stops, and the secondary ink box pressure regulation stops (the secondary diaphragm gas pump is closed). If the circulating anti-ink reverse ink box 20 occurs ink reverse, the initial state regulation is not performed; in the circulating state, if the secondary anti-ink reverse ink box 12 occurs ink reverse, the secondary negative pressure P0 is reduced (or the secondary pressure regulation is closed), and the circulating diaphragm liquid pump 10 is reduced (or closed). If the circulating anti-ink reverse ink box 20 occurs ink reverse, the circulating negative pressure P1 is reduced (or the circulating pressure regulation is closed), and the circulating diaphragm liquid pump 10 is increased; in the ink pressing state, if the circulating anti-ink reverse ink box 20 occurs ink reverse, the circulating negative pressure P1 is reduced (or the circulating pressure regulation is closed), and the circulating diaphragm liquid pump 10 is increased.

[0065] The inkjet head inlet fluid pressure and temperature sensor and the inkjet head outlet fluid pressure and temperature sensor detect the ink inlet pressure and temperature and the ink outlet pressure and temperature on both sides of the inkjet head, respectively. The controller can collect the pressure data of the two, calculate the pressure difference, and use it as feedback basis to ensure that the system dynamically controls the rotating speed of the circulating diaphragm liquid pump 10, the secondary diaphragm gas pump 14 (secondary gas pressure regulation pressure), and the circulating diaphragm gas pump 22 (circulating gas pressure regulation pressure), thereby ensuring the printing quality.

[0066] The utility model discloses, "arrayable" concrete implementation is: first, secondary ink box 2 and secondary heating ink box 3 all provide multiple way interface, corresponding, can realize multiple way ink inlet pipeline and ink return pipeline build-up, second, a circulating ink box, an anti-inverted ink ink box, a circulating diaphragm liquid pump and a circulating liquid pulsation damper can be regarded as a combination, and it is connected with the nozzle one to one, and carries out array, namely multiple way (nozzle) build-up, and need additionally increase same quantity combination and circulating pressure regulating module, finally, controller adds same quantity control interface, and carries out control processing procedure under same quantity nozzle.

[0067] Compared with the original scheme (gravity ink supply / non-regulating pump), the embodiment improves the real-time and precision of pressure regulation, enhances the stability of nozzle double-side pressure difference, optimizes the hardware structure, greatly improves the system multi-nozzle expandability, and ensures the realization of ink path system modularization and miniaturization while guaranteeing the inkjet quality.

Claims

1. A pressure regulating and recirculating ink supply system, comprising: The ink supply system comprises a main ink tank (1), a secondary ink tank (2), a secondary heating ink tank (3) and a nozzle (9), the main ink tank (1) provides a source of ink, the secondary ink tank (2) is communicated with the main ink tank (1) through an ink supply pipeline, a liquid supply diaphragm pump (7) is arranged on the ink supply pipeline, the secondary heating ink tank (3) is communicated with the secondary ink tank (2) through a first ink inlet pipeline, an ink inlet of the nozzle (9) is communicated with the secondary heating ink tank (3) through a second ink inlet pipeline, a circulating ink tank (4) is communicated with an ink outlet of the nozzle (9) through a first ink return pipeline, the circulating ink tank (4) is communicated with the secondary ink tank (2) through a second ink return pipeline, a circulating diaphragm pump (10) is arranged on the second ink return pipeline, fluid pressure and temperature detection elements are arranged on the ink inlet and the ink outlet of the nozzle (9) respectively; a set of pressure regulating systems is arranged on the secondary ink tank (2) and the circulating ink tank (4) respectively.

2. The pressure regulating and recirculating ink supply system of claim 1, wherein, The pressure regulating system comprises a secondary ink tank pressure regulating system and a circulating ink tank pressure regulating system; The secondary ink tank pressure regulating system comprises a secondary anti-inversion ink tank (12), a secondary gas storage tank (13) and a secondary diaphragm gas pump (14), the secondary gas storage tank (13) is provided with four interfaces, a suction interface of the secondary diaphragm gas pump (14) is connected with a first interface of the secondary gas storage tank (13), a lift interface of the secondary diaphragm gas pump (14) is communicated with the atmosphere, a second interface of the secondary gas storage tank (13) is communicated with the atmosphere through a secondary needle valve (15), a third interface of the secondary gas storage tank (13) is connected with a gas pressure and temperature detection element, one interface of the secondary anti-inversion ink tank (12) is communicated with a fourth interface of the secondary gas storage tank (13) and a positive pressure gas source (19) through an electromagnetic reversing valve, a float liquid level meter is arranged in the secondary anti-inversion ink tank (12), another interface of the secondary anti-inversion ink tank (12) is communicated with the secondary ink tank (2); The circulating ink tank pressure regulating system comprises a circulating anti-inversion ink tank (20), a circulating gas storage tank (21) and a circulating diaphragm gas pump (22), the circulating gas storage tank (21) is provided with four interfaces, a suction interface of the circulating diaphragm gas pump (22) is connected with a first interface of the circulating gas storage tank (21), a lift interface of the circulating diaphragm gas pump (22) is communicated with the atmosphere, a second interface of the circulating gas storage tank (21) is communicated with the atmosphere through a circulating needle valve (23), a third interface of the circulating gas storage tank (21) is connected with a gas pressure and temperature detection element, one interface of the circulating anti-inversion ink tank (20) is communicated with a fourth interface of the circulating gas storage tank (21), a float liquid level meter is arranged in the circulating anti-inversion ink tank (20), another interface of the circulating anti-inversion ink tank (20) is communicated with the circulating ink tank (4).

3. The pressure regulating and recirculating ink supply system of claim 1, wherein, The ink supply pipeline is provided with a liquid supply check valve (5), a liquid supply filter (6), the liquid supply diaphragm pump (7) and a liquid supply fluid pulsation damper (8) from the side close to the main ink tank (1) in sequence.

4. The pressure regulating and recirculating ink supply system of claim 1, wherein, The secondary heating ink tank (3) is internally provided with a heating element and a temperature measuring element.

5. The pressure regulating and recirculating ink supply system of claim 1, wherein, A circulating fluid pulsation damper (11) is arranged on the second ink return pipeline, behind the circulating diaphragm liquid pump (10).

6. The pressure regulating and recirculating ink supply system of claim 2, wherein, The electromagnetic reversing valve is a secondary two-position three-way electromagnetic valve (18).

7. The pressure regulating and recirculating ink supply system of claim 2, wherein, The second interface of the secondary gas storage tank (13) is connected with the atmosphere through a secondary needle valve (15) and a secondary gas filter (16), and the second interface of the circulating gas storage tank (21) is connected with the atmosphere through a circulating needle valve (23) and a circulating gas filter (24).

8. The pressure regulating and recirculating ink supply system of claim 2, wherein, The fluid pressure and temperature detection elements of the ink inlet and outlet of the nozzle (9) are a nozzle inlet fluid pressure and temperature sensor (26) and a nozzle outlet fluid pressure and temperature sensor (27), and the gas pressure and temperature detection elements connected with the secondary gas storage tank (13) and the circulating gas storage tank (21) are a secondary gas pressure and temperature sensor (17) and a circulating gas pressure and temperature sensor (25).

9. The pressure regulating and recirculating ink supply system of claim 8, wherein, The nozzle inlet fluid pressure and temperature sensor (26), the nozzle outlet fluid pressure and temperature sensor (27), the secondary gas pressure and temperature sensor (17) and the circulating gas pressure and temperature sensor (25) are all circuit board mounted digital output OEM pressure sensors.

10. The pressure regulating and recirculating ink supply system of claim 2, wherein, The secondary ink cartridge (2) and the secondary heating ink cartridge (3) are provided with multiple interfaces.

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