Circulating steady-flow injection type ink supply system

Abstract

The invention relates to the technical field of ink-jet printing, in particular to a circulating steady-flow injection type ink supply system which comprises a rack, a first injection ink supply unit, a second injection ink supply unit, a reverse linkage mechanism and an ink outlet pipeline, and each of the first injection ink supply unit and the second injection ink supply unit comprises an ink supply bottle, an injection push rod and a driving module. The reverse linkage mechanism is connected between the two injection push rods in a transmission mode, the ink pushing action of one injection ink supply unit is converted into the ink sucking and supplementing action of the other injection ink supply unit, and mechanical synchronous alternating work of the double units is achieved. Ink pushing and sucking reverse synchronization of the first injection ink supply unit and the second injection ink supply unit is achieved through the reverse linkage mechanism, when one unit pushes and supplies ink, the other unit synchronously sucks ink and supplements liquid, ink supply interruption time does not exist, and the continuous operation requirement can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of inkjet printing technology, and in particular to a circulating steady flow injection type ink supply system. BACKGROUND

[0002] In the field of precision spraying and printing, the stability of ink flow has a direct impact on product quality. The existing ink path system includes a gas pressure driving system and a traditional injection pump system. Among them, the gas pressure driving system is affected by the compressibility of gas, resulting in slow response of flow control, and is easily affected by gas source fluctuation and environmental temperature, making it difficult to achieve rapid and accurate micro-control. While the traditional injection pump system has high injection precision due to the incompressibility of liquid, but the single pump structure is limited by the stroke and must be switched between injection and liquid suction, resulting in interruption of ink supply, which cannot meet the needs of long-term continuous operation, and the double pump structure is prone to out-of-sync problem when switching. SUMMARY

[0003] The technical problem to be solved by the present application is to solve at least one of the technical problems mentioned above.

[0004] The solution to the technical problem of the present application is a circulating steady flow injection type ink supply system, comprising: a rack; a first injection ink supply unit, comprising a first ink supply bottle, a first injection push rod and a first drive module driving the first injection push rod to reciprocate, the first ink supply bottle is arranged on the rack, one end of the first injection push rod is provided with a first piston, the first piston is slidingly and sealingly arranged in the inner cavity of the first ink supply bottle; a second injection ink supply unit, comprising a second ink supply bottle, a second injection push rod and a second drive module driving the second injection push rod to reciprocate, the second ink supply bottle is arranged on the rack, one end of the second injection push rod is provided with a second piston, the second piston is slidingly and sealingly arranged in the inner cavity of the second ink supply bottle; a reverse linkage mechanism arranged on the rack, the reverse linkage mechanism is drivingly connected between the first injection push rod and the second injection push rod, and is used for converting the ink injection action of one of the injection ink supply units into the ink suction and liquid supplement action of the other injection ink supply unit; an ink outlet pipeline arranged on the rack, the output end of the first ink supply bottle is communicated with the ink outlet pipeline, the output end of the second ink supply bottle is communicated with the ink outlet pipeline, and the output end of the ink outlet pipeline is used for supplying ink to the nozzle.

[0005] As a further improvement of the above technical solution, the first drive module comprises a first drive motor and a first transmission wheel, the first drive motor is arranged on the rack, the first transmission wheel is arranged on the output shaft of the first drive motor, the first transmission wheel is in transmission connection with the first injection push rod, and is used for driving the first injection push rod to reciprocate linearly along the axial direction of the first ink supply bottle; the second drive module comprises a second drive motor and a second transmission wheel, the second drive motor is arranged on the rack, the second transmission wheel is arranged on the output shaft of the second drive motor, the second transmission wheel is in transmission connection with the second injection push rod, and is used for driving the second injection push rod to reciprocate linearly along the axial direction of the second ink supply bottle.

[0006] As a further improvement of the above technical solution, the first transmission wheel and the second transmission wheel are both drive gears, the first drive module further comprises a first rack, the first rack is arranged on the outer wall of the first injection push rod, and the first rack is in engagement with the first transmission wheel; the second drive module further comprises a second rack, the second rack is arranged on the outer wall of the second injection push rod, and the second rack is in engagement with the second transmission wheel.

[0007] As a further improvement of the above technical solution, the first transmission wheel and the second transmission wheel are both drive gears, the first drive module further comprises a first rack, the first rack is arranged on the outer wall of the first injection push rod, and the first rack is in engagement with the first transmission wheel; the second drive module further comprises a second rack, the second rack is arranged on the outer wall of the second injection push rod, and the second rack is in engagement with the second transmission wheel.

[0008] As a further improvement of the above technical solution, the reverse linkage mechanism comprises a flexible traction member and a guide assembly, the guide assembly is arranged on the rack and located between the first injection ink supply unit and the second injection ink supply unit, the flexible traction member is wound on the guide assembly, one end of the flexible traction member is fixedly connected to the first injection push rod, and the other end of the flexible traction member is fixedly connected to the second injection push rod.

[0009] As a further improvement of the above technical solution, the guide assembly comprises a first arc-shaped guide rail and a second arc-shaped guide rail, both of which are arranged on the rack, a continuous guide space is formed between the first arc-shaped guide rail and the second arc-shaped guide rail, the flexible traction member is constrained to extend in the guide space and complete the conversion of the movement direction, so as to convert the downward thrust of one of the injection push rods into the upward pulling force of the other injection push rod.

[0010] As a further improvement of the above technical solution, the guide assembly further comprises a first pulley set and a second pulley set, the first pulley set is arranged on one side of the first arc-shaped guide rail facing the second arc-shaped guide rail, the second pulley set is arranged on one side of the second arc-shaped guide rail facing the first arc-shaped guide rail, and the first pulley set and the second pulley set are both in rolling connection with the flexible traction member.

[0011] As a further improvement of the above technical solution, a valve control group is further included, the valve control group comprises a first ink outlet check valve, a second ink outlet check valve, a first ink inlet check valve and a second ink inlet check valve, the first ink outlet check valve is arranged on the output pipeline of the first ink supply bottle, the second ink outlet check valve is arranged on the output pipeline of the second ink supply bottle, the first ink inlet check valve is arranged on the input pipeline of the first ink supply bottle, and the second ink inlet check valve is arranged on the input pipeline of the second ink supply bottle.

[0012] As a further improvement of the above technical solution, a flow sensor and a controller are further included, the flow sensor is arranged at the output end of the ink outlet pipeline, and the controller is electrically connected with the flow sensor, the first driving module and the second driving module respectively.

[0013] As a further improvement of the above technical solution, a flow stabilizing and buffering assembly is further included and arranged on the rack, an output end of the flow stabilizing and buffering assembly is communicated with the ink outlet pipeline, and the flow stabilizing and buffering assembly is used for maintaining the stability of the output flow rate during the ink supply switching process of the two ink injection supply units.

[0014] As a further improvement of the above technical solution, the flow stabilizing and buffering assembly comprises a third ink supply bottle, a third injection push rod and a third driving module for driving the third injection push rod to reciprocate, the third ink supply bottle is arranged on the rack, one end of the third injection push rod is provided with a third piston, and the third piston is slidingly and sealingly arranged in the inner cavity of the third ink supply bottle.

[0015] As a further improvement of the above technical solution, a nozzle, a main ink bottle, a secondary ink bottle and a circulating pump are further included, an output end of the main ink bottle is communicated with an input end of the first ink supply bottle and an input end of the second ink supply bottle through a pipeline, the secondary ink bottle is communicated with a waste liquid output end of the nozzle through a pipeline, and the circulating pump is communicated between an output end of the secondary ink bottle and a back-ink end of the main ink bottle through a pipeline.

[0016] The beneficial effects of the present application are that the rack provides basic support; one end of the injection push rod in the injection ink supply unit is connected with a piston, the piston is slidingly and sealingly arranged in the inner cavity of the ink supply bottle, the injection push rod is driven by the moving module to reciprocate linearly, ink injection and liquid suction are realized, the reverse linkage mechanism is fixedly connected with the first and second injection push rods, linear ink pushing motion of one injection push rod is converted into reverse linear ink suction motion of the other injection push rod, the synchronous motion of the two is ensured, and real-time cooperation of ink supply and liquid supplement is realized. The ink outlet pipeline stably conveys the ink output by the first and second ink supply bottles to the nozzle after the ink is converged. The reverse linkage mechanism realizes reverse and synchronous ink pushing and sucking of the first and second injection ink supply units, one unit pushes ink for ink supply while the other unit synchronously sucks ink for liquid supplement, there is no ink supply interruption time, the continuous operation demand can be met; the push rod extrudes the ink in the ink supply bottle, the incompressibility of liquid is utilized, compared with the air pressure driving, better flow control precision and stability are obtained; the reverse linkage mechanism is mechanically synchronous, complex electric control coordination algorithm is not needed, and the control system complexity is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of an embodiment of the present application.

[0018] Figure 2 is a cooperation schematic diagram of the first injection ink supply unit, the second injection ink supply unit and the reverse linkage mechanism of an embodiment of the present application.

[0019] Figure 3 is one of the circulation nozzle ink supply schematic diagrams of an embodiment of the present application.

[0020] Figure 4 is the other of the circulation nozzle ink supply schematic diagrams of an embodiment of the present application.

[0021] Reference signs in the drawings: 100-rack, 200-first injection ink supply unit, 210-first ink supply bottle, 220-first injection push rod, 230-first drive module, 231-first drive motor, 232-first transmission wheel, 233-first friction transmission surface, 300-second injection ink supply unit, 310-second ink supply bottle, 320-second injection push rod, 330-second drive module, 331-second drive motor, 332-second transmission wheel, 333-second friction transmission surface, 400-reverse linkage mechanism, 410-flexible traction member, 421-first arc-shaped guide rail, 422-second arc-shaped guide rail, 423-first pulley set, 424-second pulley set, 500-ink outlet pipeline, 600-first ink outlet check valve, 610-second ink outlet check valve, 620-first ink inlet check valve, 630-second ink inlet check valve, 700-flow sensor, 800-flow stabilizing buffer assembly, 810-third ink supply bottle, 820-third injection push rod, 830-third drive module, 900-nozzle, 910-main ink bottle, 920-vice ink bottle, 930-circulating pump. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the above description of the embodiments are briefly described. Obviously, the described drawings are only a part of the embodiments of the present application, not all the embodiments, and those skilled in the art can obtain other design schemes and drawings from these drawings without creative labor.

[0023] The concept, specific structure and generated technical effects of the present application will be described clearly and completely in combination with the embodiments and drawings, so as to fully understand the purpose, features and effects of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments, and other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative labor are within the protection scope of the present application. In addition, all the coupling / connection relations mentioned in the text do not mean that the components are directly connected, but that a better coupling structure can be composed by adding or reducing coupling accessories according to the specific implementation. The technical features in the present application can be combined interactively without mutual contradiction and conflict.

[0024] In the field of precision spraying and printing, the stability of ink flow has a direct impact on product quality. The existing ink path system includes a pneumatic drive system and a traditional injection pump system. Among them, the pneumatic drive system is affected by the compressibility of gas, which causes the flow control response to be slow, and is easily affected by the gas source fluctuation and the environmental temperature, and it is difficult to achieve fast and accurate micro-control. While the traditional injection pump system, due to the incompressibility of liquid, the injection accuracy of the injection pump is higher, but the single pump structure is limited by the stroke, and must be switched between injection and liquid suction, which leads to the interruption of ink supply, and cannot meet the needs of long-time continuous operation, and the double-pump structure is prone to out-of-sync problem when switching.

[0025] Therefore, the present application provides a circulating stable flow injection type ink supply system, referring to Figures 1-4 It comprises: a rack 100; a first injection ink supply unit 200, comprising a first ink supply bottle 210, a first injection push rod 220 and a first drive module 230 driving the first injection push rod 220 to reciprocate, the first ink supply bottle 210 is arranged on the rack 100, one end of the first injection push rod 220 is provided with a first piston, the first piston is slidingly sealed in the inner cavity of the first ink supply bottle 210; a second injection ink supply unit 300, comprising a second ink supply bottle 310, a second injection push rod 320 and a second drive module 330 driving the second injection push rod 320 to reciprocate, the second ink supply bottle 310 is arranged on the rack 100, one end of the second injection push rod 320 is provided with a second piston, the second piston is slidingly sealed in the inner cavity of the second ink supply bottle 310; a reverse linkage mechanism 400 is arranged on the rack 100, the reverse linkage mechanism 400 is drivingly connected between the first injection push rod 220 and the second injection push rod 320, for converting the ink injection action of the injection push rod of one injection ink supply unit into the ink suction and liquid supplement action of the injection push rod of the other injection ink supply unit; an ink outlet pipeline 500 is arranged on the rack 100, the output end of the first ink supply bottle 210 is communicated with the ink outlet pipeline 500, the output end of the second ink supply bottle 310 is communicated with the ink outlet pipeline 500, and the output end of the ink outlet pipeline 500 is used for supplying ink to the nozzle 900.

[0026] The rack 100 provides basic support; one end of the injection push rod in the injection ink supply unit is connected with a piston, the piston is slidingly and sealingly arranged in the inner cavity of the ink supply bottle, the injection push rod is driven by the moving module to reciprocate linearly, ink injection and liquid suction are realized, the reverse linkage mechanism 400 is fixedly connected with the first and second injection push rods 320, linear ink pushing motion of one injection push rod is converted into reverse linear ink suction motion of the other injection push rod, synchronous motion of the two is ensured, and real-time cooperation of ink supply and liquid supplement is realized. The ink outlet pipeline 500 stably conveys the ink output by the first and second ink supply bottles 310 to the nozzle 900 after the ink is converged. The reverse linkage mechanism 400 realizes reverse and synchronous ink pushing and suction of the first and second injection ink supply units 300, one unit pushes ink for ink supply while the other unit synchronously sucks ink for liquid supplement, there is no ink supply interruption time, and the continuous operation requirement can be met; the push rod extrudes the ink in the ink supply bottle, the incompressibility of the liquid is utilized, and compared with air pressure driving, better flow control precision and stability are obtained; the reverse linkage mechanism 400 is mechanically synchronous, and a complex electric control coordination algorithm is not needed, and the control system complexity is reduced.

[0027] During continuous ink supply operation, the first driving module 230 is started, the first injection push rod 220 is driven to advance to the inside of the first ink supply bottle 210, ink is extruded from the output end of the first ink supply bottle 210 into the ink outlet pipeline 500 and stably conveyed to the nozzle 900; at the same time, the first injection push rod 220 drives the second injection push rod 320 to retreat to the outside of the second ink supply bottle 310 through the reverse linkage mechanism 400, external ink is sucked into the second ink supply bottle 310, and liquid supplement is completed; when the first injection push rod 220 reaches the stroke end point, the second injection push rod 320 is synchronously switched to ink pushing motion, the first injection push rod 220 is synchronously switched to ink suction motion, the above process is repeated, and continuous and uninterrupted ink supply is realized.

[0028] In an embodiment, the first drive module 230 comprises a first drive motor 231 and a first transmission wheel 232, the first drive motor 231 is arranged on the rack 100, the first transmission wheel 232 is arranged on the output shaft of the first drive motor 231, the first transmission wheel 232 is in transmission connection with the first injection push rod 220, for driving the first injection push rod 220 to reciprocate linearly along the axial direction of the first ink supply bottle 210; the second drive module 330 comprises a second drive motor 331 and a second transmission wheel 332, the second drive motor 331 is arranged on the rack 100, the second transmission wheel 332 is arranged on the output shaft of the second drive motor 331, the second transmission wheel 332 is in transmission connection with the second injection push rod 320, for driving the second injection push rod 320 to reciprocate linearly along the axial direction of the second ink supply bottle 310. The motor is powered to rotate, driving the transmission wheel on the output shaft to rotate, and the transmission wheel converts the rotary motion into the linear reciprocating motion of the push rod in the ink supply bottle through friction or meshing action, which is simple and mature in structure, the motor rotation angle can be accurately controlled, the control precision is high, and the ink supply speed is easy to adjust through the electric control system.

[0029] In the high-viscosity ink or high-pressure ink supply scene, simple contact transmission may slip, resulting in inaccurate ink pushing amount. Therefore, in an embodiment, the first transmission wheel 232 and the second transmission wheel 332 are both drive gears, the first drive module 230 further comprises a first rack, the first rack is arranged on the outer wall of the first injection push rod 220, the first rack is in meshing connection with the first transmission wheel 232; the second drive module 330 further comprises a second rack, the second rack is arranged on the outer wall of the second injection push rod 320, the second rack is in meshing connection with the second transmission wheel 332. The gear teeth of the gear and the rack on the push rod are mutually engaged, the push rod necessarily moves a corresponding linear distance for each angle of the motor, realizing forced displacement, adopting the meshing transmission mode of the gear and the rack, realizing zero slip, ensuring the absolute accuracy of the injection amount, especially suitable for the OLED printing process which has very high requirements on flow accuracy, and the transmission thrust is large.

[0030] Gear transmission exists gear gap, which may cause slight vibration when reversing; and hard connection lacks overload protection. Thus, in an embodiment, the first transmission wheel 232 and the second transmission wheel 332 are both driving friction wheels, the outer wall of the first injection push rod 220 is provided with a first friction transmission surface 233 matched with the first transmission wheel 232, and the outer wall of the second injection push rod 320 is provided with a second friction transmission surface 333 matched with the second transmission wheel 332. The flexible contact transmission of the friction wheel, the rubber or polyurethane material roller, is tightly pressed on the matte plane of the push rod, the static friction force is generated between the wheel and the rod by the normal pressure, the push rod is driven to move by the friction force, the transmission is stable and free of vibration, and the noise is low; when the system is accidentally blocked, the friction wheel can slip, which plays an overload protection role and prevents the damage of the expensive nozzle 900 or the motor.

[0031] If the reverse linkage adopts a connecting rod or a lever, the structure is large and occupies horizontal space. Thus, in an embodiment, the reverse linkage mechanism 400 includes a flexible traction member 410 and a guide assembly, the guide assembly is arranged on the rack 100 and located between the first injection ink supply unit 200 and the second injection ink supply unit 300, the flexible traction member 410 is arranged around the guide assembly, one end of the flexible traction member 410 is fixedly connected to the first injection push rod 220, and the other end is fixedly connected to the second injection push rod 320. The flexible traction member 410 cooperates with the guide assembly, specifically, the flexible traction member 410 is a steel wire rope or a synchronous belt, when the first injection push rod 220 moves downward along the axial direction, the second injection push rod 320 is driven to move upward along the axial direction through the flexible traction member 410, or vice versa, to realize the alternating working mode of one injection unit pushing ink and the other injection unit synchronously absorbing ink to supplement liquid, the structure is extremely compact and can be flexibly arranged; the parallelism error tolerance of the two push rods is high due to the characteristics of the flexible member, and the two push rods are not easy to be stuck.

[0032] In an embodiment, the guide assembly includes a first arc-shaped guide rail 421 and a second arc-shaped guide rail 422, both arranged on the rack 100, a continuous guide space is formed between the first arc-shaped guide rail 421 and the second arc-shaped guide rail 422, the flexible traction member 410 is constrained to extend in the guide space and complete the motion direction conversion, so as to convert the downward thrust of one injection push rod into the upward pulling force of the other injection push rod. The U-shaped reverse path is constructed by the arc-shaped guide rails, the flexible member passes through the U-shaped channel and is forced to change the extension direction, so as to realize the conversion of the downward movement on one side into the upward movement on the other side. The smoothness of the movement and the realization of the reverse logic are ensured, the flexible member is prevented from falling off, and the setting of the U-shaped reverse path makes the entire ink supply system more compact in space layout, reduces the overall volume of the equipment, and facilitates the installation and use in various working environments.

[0033] The flexible member directly slides in the guide rail, which generates large sliding friction, resulting in energy loss and wear, and affecting control accuracy. Thus, in an embodiment, the guide assembly further comprises a first pulley set 423 and a second pulley set 424, the first pulley set 423 is arranged on one side of the first arc-shaped guide rail 421 facing the second arc-shaped guide rail 422, and the second pulley set 424 is arranged on one side of the second arc-shaped guide rail 422 facing the first arc-shaped guide rail 421, and the first pulley set 423 and the second pulley set 424 are both in rolling connection with the flexible traction member 410. The rolling friction element is introduced, the first pulley set 423 and the second pulley set 424 are arranged at the turning of the guide rail, and the flexible member is in rolling contact, so as to convert the sliding friction between the flexible traction member 410 and the guide rail into rolling friction, reduce the movement resistance, improve the transmission efficiency, prolong the service life, and make the push-pull action smoother.

[0034] When the injection pump reciprocates, how to ensure that the ink flows to the nozzle 900 and the ink bottle may appear reverse flow, affecting the stability of ink supply and the printing quality. Thus, in an embodiment, a valve control group is further included, the valve control group comprises: a first ink outlet check valve 600, a second ink outlet check valve 610, a first ink inlet check valve 620, and a second ink inlet check valve 630, the first ink outlet check valve 600 is arranged on the output pipeline of the first ink supply bottle 210, the second ink outlet check valve 610 is arranged on the output pipeline of the second ink supply bottle 310, the first ink inlet check valve 620 is arranged on the input pipeline of the first ink supply bottle 210, and the second ink inlet check valve 630 is arranged on the input pipeline of the second ink supply bottle 310. The one-way control structure is arranged on the pipeline between the injection pump and the nozzle 900 and the ink bottle, and the one-way flow characteristics of the check valve are used to ensure that the ink can only flow in the preset direction. When the injection pump pushes the ink to the nozzle 900, the first ink outlet check valve 600 and the second ink outlet check valve 610 are opened to allow the ink to flow smoothly to the nozzle 900; at the same time, the first ink inlet check valve 620 and the second ink inlet check valve 630 are closed to prevent the ink from flowing back to the ink bottle. When the injection pump draws the ink, the situation is opposite, the ink inlet check valve is opened, and the ink outlet check valve is closed, realizing the circulation of the ink, preventing the ink from flowing back to pollute the main ink bottle 910, and preventing air from being sucked into the nozzle 900, which is the basis of the liquid circuit for realizing continuous ink supply.

[0035] Only rely on the preset parameters of the drive module, such as motor speed, push rod speed, etc. to control the flow, which may cause flow drift due to changes in ink viscosity, fluctuations in pipeline resistance and other factors. Therefore, in an embodiment, it also includes a flow sensor 700 and a controller, the flow sensor 700 is arranged at the output end of the ink outlet pipeline 500, and the controller is electrically connected with the flow sensor 700, the first drive module 230 and the second drive module 330 respectively. The controller is configured to adjust the output speed of the drive module according to the real-time flow rate signal fed back by the flow sensor 700, so as to compensate for the flow fluctuation caused by changes in ink viscosity, fluctuations in pipeline resistance, double pump switching and other factors in time, and solve the product defects caused by the response lag of the traditional system.

[0036] At the moment of switching of the double pumps, one just stops and the other just starts, and there will be a short pressure drop or flow fluctuation in the total pipeline. Therefore, in an embodiment, it also includes a flow stabilizing buffer assembly 800 arranged on the rack 100, and the output end of the flow stabilizing buffer assembly 800 is communicated with the ink outlet pipeline 500, for maintaining the stability of the output flow rate during the switching process of the two injection ink supply units. The flow stabilizing buffer assembly 800 is added on the ink outlet pipeline 500 as a compensator to release or absorb fluid when the pressure fluctuates, so as to ensure that the flow rate at the nozzle 900 end during the switching gap is still a smooth straight line, and the consistency of the printing quality is ensured.

[0037] If passive buffering such as airbags is adopted, the response is slow and the accuracy is low, and it is difficult to achieve high-precision pulse elimination. Thus, in an embodiment, the flow stabilizing buffer assembly 800 includes a third ink supply bottle 810, a third injection push rod 820, and a third drive module 830 for driving the third injection push rod 820 to reciprocate, the third ink supply bottle 810 is arranged on the rack 100, one end of the third injection push rod 820 is provided with a third piston, and the third piston is slidingly and sealingly arranged in the inner cavity of the third ink supply bottle 810. The third drive module 830 has the same structure as the first drive module 230 and is used to drive the third injection push rod 820 to make reciprocating linear motion in the axial direction. In this embodiment, the third injection unit does not participate in regular ink supply and is only used as a dynamic flow compensation device and is triggered to be used when the two main injection units switch the ink supply state. Specifically, when the flow sensor 700 detects that the real-time flow rate in the ink outlet pipeline 500 drops below a preset threshold or the flow rate changes at a rate exceeding a set range, the controller determines that the current is in the ink supply transition period and immediately sends a compensation instruction to the third drive module 830; the third drive module 830 responds to the instruction and controls the third injection push rod 820 to push the piston to inject a small amount of ink into the ink outlet pipeline 500 to compensate for the instantaneous flow gap; after completing the compensation action, the third injection push rod 820 is retracted in the opposite direction to form a negative pressure and suck a small amount of excess ink from the ink outlet pipeline 500 to achieve self-calibration reset and prevent cumulative errors. Further, the controller can establish a prediction model according to historical flow data, start the third injection unit in advance before the main injection unit completes the push stroke, realize forward-looking compensation, and further improve the flow stabilization effect. Through the above closed-loop control strategy, the system can always maintain small fluctuations in the ink outlet flow rate during the alternating work of the double injection units, which is better than the traditional intermittent ink supply system.

[0038] The single ink bottle design may cause ink supply interruption due to ink depletion, and the machine needs to be stopped for liquid replenishment, which affects the continuous operation efficiency. Thus, in an embodiment, a nozzle, a main ink bottle, a secondary ink bottle, and a circulating pump are further included, the output end of the main ink bottle is connected to the input end of the first ink supply bottle 210 and the input end of the second ink supply bottle 310 through pipelines, the secondary ink bottle is connected to the waste liquid output end of the nozzle through a pipeline, and the circulating pump is connected to the output end of the secondary ink bottle and the ink return end of the main ink bottle through a pipeline. The secondary ink bottle collects waste liquid from the nozzle, and the circulating pump drives the waste liquid to flow back to the main ink bottle, thereby improving the ink recovery rate, reducing the waste rate, reducing the cost of consumables, avoiding waste liquid emission to pollute the environment, and meeting environmental protection requirements; the main ink bottle has a large volume and is supplemented by the secondary ink bottle, thereby avoiding machine stoppage due to ink depletion and avoiding that the continuous operation time is limited by the ink capacity; the circulating pump drives the ink to continuously flow and update, thereby ensuring the uniformity of the ink.

[0039] The preferred embodiments of the present application have been disclosed with specific reference to a preferred embodiment. A person with ordinary skill in the art understands that variations in, or replacements for, the preferred embodiments described herein can be made without departing from the spirit of the application. These equivalent variations or replacements are also encompassed within the scope of the claims defined below.

Claims

1. A recirculating, steady flow, injection type ink supply system characterized by, The application relates to an ink injection device. The device comprises a rack, a first ink injection unit, a second ink injection unit, a reverse linkage mechanism, and an ink outlet pipeline. The first ink injection unit comprises a first ink supply bottle, a first injection push rod, and a first driving module for driving the first injection push rod to reciprocate. The second ink injection unit comprises a second ink supply bottle, a second injection push rod, and a second driving module for driving the second injection push rod to reciprocate. The reverse linkage mechanism is arranged on the rack and is connected between the first injection push rod and the second injection push rod. The reverse linkage mechanism is arranged on the rack and is connected between the first injection push rod and the second injection push rod.

2. The recirculating current regulated injection type ink supply system according to claim 1, wherein The first driving module comprises a first driving motor and a first driving gear.

3. The recirculating dcficient fluid- stable injection ink system of claim 2, wherein, The first driving motor is arranged on the rack, and the first driving gear is arranged on an output shaft of the first driving motor.

4. The recirculating dcficient fluid injection ink supply system of claim 2 wherein, The first driving gear is connected with the first injection push rod and is used for driving the first injection push rod to reciprocate along the axial direction of the first ink supply bottle.

5. The recirculating current regulated inkjet inking system of claim 1, wherein, The second driving module comprises a second driving motor and a second driving gear. The second driving motor is arranged on the rack, and the second driving gear is arranged on an output shaft of the second driving motor. The second driving gear is connected with the second injection push rod and is used for driving the second injection push rod to reciprocate along the axial direction of the second ink supply bottle. The first driving gear and the second driving gear are driving gears. The first driving module further comprises a first rack gear. The first rack gear is arranged on the outer wall of the first injection push rod and is engaged with the first driving gear. The second driving module further comprises a second rack gear. The second rack gear is arranged on the outer wall of the second injection push rod and is engaged with the second driving gear. The first driving gear and the second driving gear are driving friction gears. The outer wall of the first injection push rod is provided with a first friction transmission surface matched with the first driving gear. The outer wall of the second injection push rod is provided with a second friction transmission surface matched with the second driving gear. The reverse linkage mechanism comprises a flexible traction member and a guide assembly. The guide assembly is arranged on the rack and is located between the first ink injection unit and the second ink injection unit. The flexible traction member is arranged around the guide assembly. One end of the flexible traction member is fixedly connected with the first injection push rod, and the other end is fixedly connected with the second injection push rod.

6. The recirculating current regulated inkjet inking system of claim 5, wherein, The guide assembly comprises a first arc-shaped guide rail and a second arc-shaped guide rail, which are arranged on the frame and form a continuous guide space between them, and the flexible traction member is constrained to extend in the guide space and complete the motion direction conversion to convert the downward thrust of one injection push rod into the upward pulling force of the other injection push rod.

7. The recirculating current regulated, injection molded ink supply system of claim 6, wherein, The guide assembly further comprises a first pulley set and a second pulley set, the first pulley set is arranged on one side of the first arc-shaped guide rail facing the second arc-shaped guide rail, and the second pulley set is arranged on one side of the second arc-shaped guide rail facing the first arc-shaped guide rail, and the first pulley set and the second pulley set are both in rolling connection with the flexible traction member.

8. The recirculating current regulated inkjet inking system of claim 1, wherein, The valve control group comprises a first ink outlet check valve, a second ink outlet check valve, a first ink inlet check valve and a second ink inlet check valve, the first ink outlet check valve is arranged on the output pipeline of the first ink supply bottle, the second ink outlet check valve is arranged on the output pipeline of the second ink supply bottle, the first ink inlet check valve is arranged on the input pipeline of the first ink supply bottle, and the second ink inlet check valve is arranged on the input pipeline of the second ink supply bottle.

9. The recirculating current regulated inkjet inking system of claim 1, wherein, The flow sensor is arranged at the output end of the ink pipeline, and the controller is electrically connected with the flow sensor, the first driving module and the second driving module respectively.

10. The recirculating current regulated inkjet inking system of claim 9, wherein, The flow stabilizing and buffering assembly is arranged on the frame, and the output end of the flow stabilizing and buffering assembly is communicated with the ink pipeline to maintain the stability of the output flow rate during the ink supply switching process of the two injection ink supply units.

11. The recirculating current regulated inkjet inking system of claim 10, wherein, The flow stabilizing and buffering assembly comprises a third ink supply bottle, a third injection push rod and a third driving module for driving the third injection push rod to reciprocate, the third ink supply bottle is arranged on the frame, one end of the third injection push rod is provided with a third piston, and the third piston is arranged in sliding sealing manner in the inner cavity of the third ink supply bottle.

12. The recirculating current regulated inkjet inking system of claim 1, wherein, The nozzle, the main ink bottle, the auxiliary ink bottle and the circulating pump are further included, the output end of the main ink bottle is communicated with the input end of the first ink supply bottle and the input end of the second ink supply bottle through a pipeline, the auxiliary ink bottle is communicated with the waste liquid output end of the nozzle through a pipeline, and the circulating pump is communicated between the output end of the auxiliary ink bottle and the ink return end of the main ink bottle through a pipeline.

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