WO2018064973A1 - 一种适用于循环式打印头的墨水循环系统 - Google Patents

一种适用于循环式打印头的墨水循环系统 Download PDF

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Publication number
WO2018064973A1
WO2018064973A1 PCT/CN2017/105106 CN2017105106W WO2018064973A1 WO 2018064973 A1 WO2018064973 A1 WO 2018064973A1 CN 2017105106 W CN2017105106 W CN 2017105106W WO 2018064973 A1 WO2018064973 A1 WO 2018064973A1
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ink
ink cartridge
inlet
circulating
cartridge
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PCT/CN2017/105106
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English (en)
French (fr)
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汤振华
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广州晶绘实业有限公司
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Publication of WO2018064973A1 publication Critical patent/WO2018064973A1/zh

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    • 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
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • 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
    • B41J2/18—Ink recirculation systems
    • 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
    • B41J27/00—Inking apparatus

Definitions

  • This patent relates to the field of large industrial inkjet printers, and more particularly to an ink circulation system suitable for use in a circulating printhead.
  • the circulating print head is a new type of industrial printing nozzle.
  • the principle is that the ink is squeezed out when it flows through the nozzle hole, which changes the structure of the traditional nozzle to the final point of the ink, and keeps the ink in the nozzle.
  • Mobility is designed for the field of extreme industrial inkjet printing, featuring fast speed, high precision and adaptability to many types of inks. It can effectively solve the problem of precipitation of special inks, as well as eliminate the bubbles of ink, and ensure the quality of printed patterns; applicable inks include solvents, UV, water, oil and ceramic inks.
  • the Seiko RC1536GS nozzle supports eight-level grayscale printing, which is more efficient and faster than the four-level gradient and six-level gradient. It can output 13-100PL ink droplets of different sizes.
  • the ignition frequency of single point is higher than 37khz, making the RC1536 nozzle Achieve high speed, high performance and high quality image output.
  • the inkjet printer or printer should redesign the ink circulation system according to the characteristics of the printing nozzle.
  • most of the printing nozzles are directly transplanted to Traditional ink circulation path.
  • the structure of the large circulation is adopted, that is, the direct circulation with the main ink cartridge, the structure causes the ink flow path to be too long, and for the suspended ink, such as ceramic ink, it is easy to generate a large amount of sediment, and waste a large amount of circulating power. It is not conducive to energy efficiency.
  • the field continues with a new ink circulation structure that can adapt to the characteristics of the new print nozzle.
  • the patent discloses an ink circulation system suitable for a circulating print head, comprising a circulating print head having an ink inlet end and an ink discharge end, a main ink cartridge having an ink supply end, and a secondary ink cartridge, characterized in that: the secondary ink cartridge
  • the first ink cartridge has a first inlet connected to the ink supply end, a first outlet connected to the ink inlet end, and a third inlet connected to the second ink cartridge, at the ink outlet end
  • An ink supply pump is disposed between the inlets;
  • the second ink cartridge has a second inlet connected to the ink discharge end, a second outlet connected to the third inlet, and a circulation pump is disposed between the second outlet and the third inlet.
  • the process of the ink path is: the pump pressure is supplied by the ink supply pump, and the ink flowing out from the ink supply end of the main ink cartridge enters the first ink cartridge through the first inlet, and then flows out from the first outlet to the circulating print head.
  • the pump pressure is supplied by the circulation pump, the circulating ink in the second ink cartridge flows out through the second outlet, and is injected back from the third inlet to the first ink cartridge.
  • the circulation pump allows the ink to flow continuously between the first ink cartridge, the endless printhead and the second ink cartridge, providing a small cycle.
  • the ink consumed by the printing is replenished from the main ink cartridge to the small circulation by the ink supply pump.
  • the small cycle used in this patent combined with the replenishing liquid keeps the ink flowing continuously during the working process, and the circulation path is short, and it is not easy to form a precipitate.
  • the first ink cartridge of the present patent is further provided with a liquid level detecting device for controlling the ink supply pump and a liquid level protecting device for controlling the ink supply pump and the circulation pump.
  • the liquid level detecting device is configured to detect the liquid level height of the first ink cartridge and control the operation of the ink supply pump.
  • the liquid level protection device is used to detect whether the liquid level is too high, stop the ink supply and circulation after the high level occurs, and alarm.
  • the cause of excessive pressure may be that the control valve or the line connecting the control valve is blocked. Therefore, the first ink cartridge further described in this patent is further provided with a first pressure detecting device.
  • the first pressure detecting device is configured to detect the pressure of the first ink cartridge when the pressure value is greater than the set range. The device stops working and alarms to achieve the function of the nozzle protection.
  • the ink reaches the first ink cartridge from the main ink tank through the ink supply pump and the filter, and the liquid level detecting device ensures that the liquid level of the first ink cartridge is in a set state.
  • the first ink cartridge is further provided with a first control valve that is turned on during operation and closed when not in operation. In the normal power-on state, the pressure of the first ink cartridge is at normal atmospheric pressure through the first control valve (conduction). When the device is turned off, the first control valve is closed and the first ink cartridge is in a vacuum state. It is guaranteed that the print head will not drop ink due to the internal loop stop working after shutdown. It should be noted that when there is ink exceeding the protection level, the ink can flow out from the first control valve, so it is necessary to protect the ink from flowing out.
  • the first outlet of the patent is disposed at the bottom of the first ink cartridge, and the ink supply pump and the circulation pump are jointly controlled, and the liquid level in the first ink cartridge is at the height of the third inlet during operation.
  • the third inlet should be as large as possible to buffer the returned ink, reduce the bubbles generated by the impact, and reduce the fluctuation of the ink against the liquid surface.
  • the second ink cartridge is further provided with a second pressure detecting device that controls the circulation pump.
  • the function of the second ink cartridge is to provide a stable space for recirculating ink.
  • the pressure value of the second ink cartridge is different according to different inks and different ink temperatures and the height of the ink cartridge and the print head.
  • the second pressure detecting device is a detecting device for controlling the pressure of the second ink cartridge for controlling the flow rate of the circulating pump to achieve the purpose of stabilizing the pressure of the second ink cartridge, and stabilizing the pressure of the second ink cartridge to stabilize the ink flow rate flowing through the spray head .
  • the second ink cartridge is further provided with a second control valve that is closed when working/not working and turned on during cleaning.
  • the second control valve is closed during normal operation and shutdown, which ensures the pressure of the second ink cartridge during normal operation. The force ensures that the print head will not drop ink when it is turned off.
  • the second control valve is opened, and the second ink cartridge is in an atmospheric pressure state, and is dripped from the printing head by the self-weight of the ink, and the second control valve is closed after the cleaning is completed.
  • the patent further has an ink supply filter between the ink discharge end and the first inlet, and a circulation filter between the second outlet and the third inlet, the circulation filter also passes The third control valve communicates with the main ink cartridge.
  • the function of the filter is to filter out the impurities of the ink path and to separate the bubbles, wherein the circulation filter is preferably installed vertically, and the mounting direction is up and down.
  • each printing ink comprises a plurality of circulating print heads
  • the patent preferably designs the first ink cartridge and the second ink cartridge in a long ink-shaped structure, each having a plurality of first outlets and a plurality of second
  • the inlets are connected to each of the recirculating printheads one by one.
  • the plurality of second inlets are distributed at the same height on the second ink cartridge having the elongated ink structure.
  • This patent is designed for a new type of circulating print head with a small circulation system, which shortens the path length of the ink path, reduces the precipitation of ink, and improves the stability and print quality of the equipment.
  • the further sub-ink cartridge structure provides an independent liquid level and pressure control mechanism to ensure the safety of the print head and reduce the frequency of faults.
  • the sub-tank structure is specially designed for industrial equipment, which reduces system redundancy, simplifies the mechanism, and reduces manufacturing costs and difficulty. It has outstanding substantive features and significant progress over the prior art.
  • FIG. 1 is a schematic structural diagram of a system according to an embodiment of the present disclosure.
  • An ink circulation system suitable for a circulating print head as shown in FIG. 1 includes a recirculating print head 100 having an ink inlet end 101 and an ink discharge end 102, and a main ink cartridge having an ink supply end 201 and a recovery ink end 202. 200, and a secondary ink cartridge 300.
  • the main ink cartridge 200 supplies ink to the sub-tank 300 through the ink supply pump 400, and the ink is pumped from the ink supply end 201, flows through the ink supply filter 410, and enters the sub-tank 300.
  • the ink of the sub tank 300 is supplied to the recirculating print head 100 for printing, and a small cycle is formed, and the ink enters the recirculating print head 100 from the ink feed end 101, and the remaining ink is printed from the ink discharge end 102 back into the sub tank 300.
  • the sub-tank 300 is composed of a first ink cartridge 310 and a second ink cartridge 320.
  • the first ink cartridge 310 has a first inlet 311 connected to the ink supply end 201, and a first outlet 312 connected to the ink supply end 101, and is connected to the second ink cartridge 320.
  • the second ink cartridge 320 has a second inlet 321 connected to the ink discharge end 102 and a second outlet connected to the third inlet 313.
  • the port 322 is provided with a circulation pump 500 between the second outlet 322 and the third inlet 313.
  • the pump is pumped out by the circulation pump 500, flows out from the second outlet 322, and flows from the third inlet 313 into the first ink cartridge 310 to form.
  • the above small cycle After the ink remaining from the ink discharge end 320 flows back to the second ink cartridge 320 through the second inlet 321, the pump is pumped out by the circulation pump 500, flows out from the second outlet 322, and flows from the third inlet 313 into the first ink cartridge 310 to form.
  • an ink tray 700 for cleaning is further provided, which is connected to the recovery end 202 of the main ink cartridge 200. During the cleaning process, ink flowing from the endless printhead 200 can flow from the ink tray 700 back to the main cartridge 200 to form a large cycle.
  • the first ink cartridge 310 is further provided with a liquid level detecting device 314 for controlling the ink supply pump 400 and for controlling the ink supply pump 400. And a liquid level protection device 315 of the circulation pump 500.
  • the liquid level detecting device 314 controls the ink supply pump 400 to pump more ink from the main ink cartridge 200 for replenishment.
  • the control is provided.
  • the ink pump 400 stops supplying ink.
  • the printing consumes ink through a small cycle.
  • the liquid level protection device 315 controls the ink supply pump 400 and the circulation pump 500 to stop operating and alarms.
  • the first ink cartridge 310 of the present embodiment is further provided with a first pressure detecting device 316 because the ink tube is clogged or other problems may also cause the pressure in the first ink cartridge 310 to be excessive, not only the level of the liquid level.
  • the first pressure detecting device 316 is connected to the alarm device of the printer. When the pressure exceeds or falls below the preset threshold, and the pressure problem is not solved by controlling the ink supply pump 400 and the circulation pump 500, the first pressure detecting 316 is stopped accordingly. Make an alarm.
  • the first ink cartridge 310 is further provided with a first control valve 317 that is turned on during operation and is turned off when not in operation.
  • the first control valve 317 In the normal startup state, the first control valve 317 is turned on, and the pressure of the first ink cartridge 310 is at normal atmospheric pressure to ensure normal supply of ink.
  • the first control valve 317 When the device is turned off, the first control valve 317 is closed, and the first ink cartridge 310 is in a vacuum or negative pressure state. It is guaranteed that the print head will not drop ink due to the internal loop stop working after shutdown. It should be noted that when there is ink exceeding the protection level, the ink can flow out from the first control valve, so it is necessary to protect the ink from flowing out.
  • the pipe connecting the first control valve 317 to the outside is provided with an air filter to prevent impurities such as dust from entering the first ink cartridge 310.
  • the first outlet 312 is disposed at the bottom of the first ink cartridge 310, and the ink supply pump 400 and the circulation pump 500 are jointly controlled, and the liquid level in the first ink cartridge 310 is at the third position during operation.
  • the third inlet 313 is disposed on the side of the first ink cartridge 310, and the third inlet 313 should be as large as possible to buffer the returned ink, reduce bubbles generated by the impact, and reduce fluctuations in the impact of the ink on the liquid surface.
  • the second ink cartridge 320 is further provided with a second pressure detecting device 323 that controls the circulation pump 500.
  • the second ink cartridge 320 functions to provide a reflow stable space for the circulating ink, and the second ink cartridge 320 pressure value is different according to different inks and different ink temperatures and the height of the ink cartridge and the recirculating print head 100.
  • the set pressure is preferably 0.5 KPa under the pressure value of the surface of the circulating print head 100 without dripping. Note that the value displayed by the controller is positive and the actual pressure value is negative.
  • the second pressure detecting device 323 is a detecting device for controlling the pressure of the second ink cartridge 320 for controlling The flow rate of the circulation pump 500 is thereby reached to stabilize the pressure of the second ink cartridge 320, and the pressure of the second ink cartridge 320 is stabilized to stabilize the flow rate of the ink flowing through the nozzle.
  • the embodiment further provides a circulation filter 510 between the second outlet 321 and the third inlet 313, and the circulation filter 510 also communicates with the main ink cartridge 200 through the third control valve 511.
  • the circulation filter 510 functions to filter out the ink path impurities and to separate the bubbles, preferably vertically, and the mounting direction is up and down.
  • each color of the circulating print head is composed of a plurality of sets of print head units, that is, each of the first ink cartridge 310 and the second ink cartridge 320 corresponds to a plurality of print heads, a first ink cartridge 310 and a second ink cartridge.
  • 320 is a long ink-shaped ink structure, and has a plurality of first outlets 312 and a plurality of second inlets 321 respectively connected to the respective circulating print heads 100 one by one.
  • a main ink cartridge 200 having one color of each color supplies ink to the first ink cartridge 310, and has a uniform ink tray 700 for recovering ink of each color.
  • the plurality of second inlets 321 are distributed at the same height on the second ink cartridge 320 having a long ink structure.

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Abstract

一种适用于循环式打印头的墨水循环系统，包括：具有进墨端（101）和出墨端（102）的循环式打印头（100），具有供墨端（201）的主墨盒（200），以及副墨盒（300），所述副墨盒（300）由第一墨盒（310）和第二墨盒（320）构成；第一墨盒（310）具有与供墨端（201）连接的第一入口（311），与进墨端（101）连接的第一出口（312），与第二墨盒（320）连接的第三入口（313），在供墨端（201）与第一入口（311）之间设有供墨泵（400）；第二墨盒（320）具有与出墨端（102）连接的第二入口（321），与第三入口（313）连接的第二出口（322），在第二出口（322）与第三入口（313）之间设有循环泵（500）。

Description

一种适用于循环式打印头的墨水循环系统 技术领域
本专利涉及大型工业喷绘机领域，更具体的说是一种适用于循环式打印头的墨水循环系统。
背景技术
循环式打印头是一种新式的工业打印喷头，其原理是让墨水流经喷孔处时被挤压喷出，改变了传统的喷孔为墨水最终点的结构，保持了墨水在喷头内的流动性，是为极端工业化喷墨印刷领域而设计，具备了速度快、精度高以及适应多种类型墨水等特点。能有效解决特殊墨水的沉淀问题，以及排除墨水的气泡，保证打印图案的品质；适用油墨包括溶剂、UV、水性、油性以及陶瓷墨水等等。如精工RC1536GS喷头支持八级灰度打印，相比较四级渐变、六级渐变，更加高效、快速省墨；可输出13-100PL不同大小墨滴，单点的点火频率高于37khz，使RC1536喷头实现高速度、高效能和高质量的图像输出。
作为一种新型的打印喷头，改变了传统喷头的墨水循环路径，则喷绘机或打印机应依据该打印喷头的特点重新设计墨水的循环系统，不过现有技术中，多数是将打印喷头直接移植到传统的墨水循环路径中。采用的是大循环的结构，即与主墨盒进行直接的循环，这种结构导致墨水流动路径过于冗长，对于悬浮墨水，如陶瓷墨水等，来说，容易产生大量的沉淀，且浪费大量循环动力，不利于高效节能。由此，该领域继续一种能够适应新型打印喷头特点的全新墨水循环结构。
实用新型内容
本专利所要解决的问题是克服现有技术中的不足，重新设计一种适用于循环式打印头的墨水循环系统，以适应新型打印喷头特点，充分发挥循环式打印头的优势。
本专利通过以下技术方案实现上述目的。
本专利公开了一种适用于循环式打印头的墨水循环系统，包括具有进墨端和出墨端的循环式打印头，具有供墨端的主墨盒，以及副墨盒，其特点在于：所述副墨盒由第一墨盒和第二墨盒构成；第一墨盒具有与供墨端连接的第一入口，与进墨端连接的第一出口，与第二墨盒连接的第三入口，在出墨端与第一入口之间设有供墨泵；第二墨盒具有与出墨端连接的第二入口，与第三入口连接的第二出口，在第二出口与第三入口之间设有循环泵。
墨路循环的过程是，通过供墨泵提供泵压，从主墨盒供墨端流出的墨水，通过第一入口进入到第一墨盒中，然后从第一出口流出至循环式打印头，从该进墨端流入，打印后从 出墨端流出，然后从第二入口进入至第二墨盒中，通过循环泵提供泵压，将第二墨盒中的循环墨水通过第二出口流出，从第三入口再次注入回到第一墨盒。通过循环泵，使得墨水能够在第一墨盒、循环式打印头和第二墨盒之间不断流动，提供一个小循环。通过供墨泵，从主墨盒向小循环补充打印消耗的墨水。当然，还可以增加墨托用于回收清洗过程中多余的墨水，形成大循环。从上述过程可见，相对于现有的大循环，本专利所采用的小循环结合补充液的方式保持了工作过程中，墨水能够持续流动，且循环路径较短，不容易形成沉淀。
循环式打印头中，向打印头供墨的压力十分重要，需要进行控制才能保证打印质量，该压力取决于第一墨盒中的墨水的液位。为了提高打印质量，本专利的第一墨盒还设有用于控制供墨泵的液位检测装置和用于控制供墨泵和循环泵的液位保护装置。液位检测装置用于检测第一墨盒的液位高度，控制供墨泵的工作。液位保护装置用于检测液位是否超高，出现超高后停止供墨和循环并报警。
另外，造成压力过大的原因可能是控制阀或连接控制阀的管路堵塞。因此，本专利进一步的所述第一墨盒还设有第一压力检测装置。第一压力检测装置用于检测第一墨盒的压力，压力值大于设定范围时。设备停止工作且报警，以达到喷头保护的功能。
墨水从主墨桶经供墨泵和过滤器到达第一墨盒，由液位检测装置保证第一墨盒的液位处于设定状态。所述第一墨盒还设有工作时导通、不工作时关闭的第一控制阀。正常开机状态下，第一墨盒的压力通过第一控制阀(导通)处于正常大气压下。设备关机时第一控制阀关闭，第一墨盒处于真空状态。保证关机时打印头不会由于关机后内循环停止工作而滴墨。需要注意的是，当有墨水超过保护液位时，墨水可以从第一控制阀流出，因此需要做墨水流出的防护。
为了稳定第一墨盒中的液位高度，本专利所述第一出口设置在第一墨盒底部，供墨泵和循环泵共同控制，工作时第一墨盒内的液位位于第三入口的高度。第三入口应尽量大，以缓冲回来的墨水，减少冲击产生的气泡，减少墨水对液面的冲击所产生的波动。
在本专利中，所述第二墨盒还设有控制循环泵的第二压力检测装置。第二墨盒的作用是为循环墨水提供回流稳定的空间，第二墨盒压力值根据不同的墨水和不同的墨水温度以及墨盒与打印头高度有所不同。第二压力检测装置是用于控制第二墨盒压力的检测装置，用于控制循环泵的流速从而到达稳定第二墨盒压力的目的，稳定了第二墨盒的压力就稳定了流经喷头的墨水流速。
为了方便清洗，所述第二墨盒还设有工作/不工作时关闭、清洗时导通的第二控制阀。第二控制阀在正常工作和关机的时候处于关闭状态，既保证了正常工作时第二墨盒的压 力，又保证了关机时打印头不会滴墨。当要进行滴墨清洗时打开第二控制阀，第二墨盒处于大气压状态，依靠墨水自重从打印头滴出，清洗完毕后关闭第二控制阀。
为了保证墨水的质量，本专利在出墨端与第一入口之间还设有供墨过滤器，在第二出口与第三入口之间还设有循环过滤器，所述循环过滤器还通过第三控制阀联通主墨盒。过滤器作用是滤除墨路杂质和分离气泡的作用，其中循环过滤器优选垂直安装，安装方向是上进下出。
在大型工业打印机中，每种打印墨水包括多个循环式打印头，本专利优选将第一墨盒和第二墨盒设计呈长条形墨埠结构，分别具有多个第一出口和多个第二入口逐一连接各个循环式打印头。采用墨埠的结构，能够对接统一主墨盒、液位检测装置、液位保护装置、压力检测装置和控制阀。大大简化了系统结构，提高设备的稳定性。
为了保证第二墨盒内部压力稳定，所述多个第二入口在呈长条形墨埠结构的第二墨盒上分布于同一高度上。
本专利专门针对新型的循环式打印头设计了小循环系统，缩短了墨路循环的路径长度，减少了墨水的沉淀，提高了设备工作的稳定性和打印质量。进一步副墨盒结构提供独立的液位及压力控制机构，保证了打印头的工作安全，减少了故障发生频率。并为工业化设备专门设计副墨盒结构，减少了系统冗余，简化机构，降低制造成本和难度。相对于现有技术具有突出的实质性特点和显著的进步。
附图说明
图1为本专利实施例的系统结构示意图。
具体事实方式
以下结合附图，举例对本专利的结构做进一步的说明。
如图1所示的一种适用于循环式打印头的墨水循环系统，包括具有进墨端101和出墨端102的循环式打印头100，具有供墨端201和回收墨端202的主墨盒200，以及副墨盒300。所述主墨盒200通过供墨泵400向副墨盒300供应墨水，墨水从供墨端201泵出，流经供墨过滤器410后进入副墨盒300。副墨盒300的墨水供给循环式打印头100进行打印，并形成小循环，墨水从进墨端101进入循环式打印头100，打印剩余的墨水从出墨端102流回副墨盒300中。
副墨盒300由第一墨盒310和第二墨盒320构成；第一墨盒310具有与供墨端201连接的第一入口311，与进墨端101连接的第一出口312，与第二墨盒320连接的第三入口313。第二墨盒320具有与出墨端102连接的第二入口321，与第三入口313连接的第二出 口322，在第二出口322与第三入口313之间设有循环泵500。打印剩余的墨水从出墨端320经第二入口321流回第二墨盒320内之后，通过循环泵500泵出，从第二出口322流出，从第三入口313流入第一墨盒310中，形成上述小循环。
该实施例中还设有清洗用的墨托700，与主墨盒200的回收末端202连接。在清洗过程中，从循环式打印头200流出的墨水可以从墨托700流回主墨盒200，形成大循环。
为了保证第一墨盒310中的压力稳定，造成循环式打印头100滴墨或缺墨，第一墨盒310还设有用于控制供墨泵400的液位检测装置314和用于控制供墨泵400和循环泵500的液位保护装置315。当液位低于预设液位的时候，液位检测装置314控制供墨泵400从主墨盒200中泵出更多的墨水进行补充，当液位高于预设液位的时候，控制供墨泵400停止供墨。通过小循环进行打印消耗墨水，当液位超过警戒线的时候，而小循环来不及消耗墨水的时候，液位保护装置315控制供墨泵400和循环泵500停止工作，并报警。
由于墨管阻塞或其他问题也有可能导致第一墨盒310内的压力过大，而不仅仅是液位的高低，所以本实施例的第一墨盒310还设有第一压力检测装置316。第一压力检测装置316跟打印机的报警装置连接，当压力超过或低于预设阈值，而通过控制供墨泵400和循环泵500都无法解决压力问题的时候，第一压力检测316相应停机并进行报警。
该实施例中第一墨盒310还设有工作时导通、不工作时关闭的第一控制阀317。正常开机状态下，第一控制阀317导通，第一墨盒310的压力处于正常大气压下，保证墨水的正常供应。设备关机时第一控制阀317关闭，第一墨盒310处于真空或负压状态。保证关机时打印头不会由于关机后内循环停止工作而滴墨。需要注意的是，当有墨水超过保护液位时，墨水可以从第一控制阀流出，因此需要做墨水流出的防护。第一控制阀317与外界联通的管道设有空气过滤器，防止外界的粉尘等杂质进入第一墨盒310内。
为了稳定第一墨盒310中的液位高度，第一出口312设置在第一墨盒310底部，所述供墨泵400和循环泵500共同控制，工作时第一墨盒310内的液位位于第三入口313的高度。第三入口313设置在第一墨盒310的侧面，而且第三入口313应尽量大，以缓冲回来的墨水，减少冲击产生的气泡，减少墨水对液面的冲击所产生的波动。
在本实施例中，所述第二墨盒320还设有控制循环泵500的第二压力检测装置323。第二墨盒320的作用是为循环墨水提供回流稳定的空间，第二墨盒320压力值根据不同的墨水和不同的墨水温度以及墨盒与循环式打印头100高度有所不同。一般设置压力是循环式打印头100表面不滴墨的压力值下再提高0.5KPa为宜。注意控制器显示的数值是正值，实际的压力值是负值。第二压力检测装置323是用于控制第二墨盒320压力的检测装置，用于控 制循环泵500的流速从而到达稳定第二墨盒压力320的目的，稳定了第二墨盒320的压力就稳定了流经喷头的墨水流速。
为了保证墨水的质量，本实施例在第二出口321与第三入口313之间还设有循环过滤器510，所述循环过滤器510还通过第三控制阀511联通主墨盒200。循环过滤器510作用是滤除墨路杂质和分离气泡的作用，优选垂直安装，安装方向是上进下出。
在本实施例中，每一种颜色的循环式打印头均由多组打印头单元构成，即每一个第一墨盒310和第二墨盒320对应多个打印头，第一墨盒310和第二墨盒320呈长条形墨埠结构，分别具有多个第一出口312和多个第二入口321逐一连接各个循环式打印头100。每种颜色具有一个该颜色的主墨盒200向所述的第一墨盒310供墨，具有统一的墨托700，用于回收每种颜色的墨水。
为了保证第二墨盒320内部压力稳定，所述多个第二入口321在呈长条形墨埠结构的第二墨盒320上分布于同一高度上。

Claims (10)

  1. 一种适用于循环式打印头的墨水循环系统，包括具有进墨端(101)和出墨端(102)的循环式打印头(100)，具有供墨端(201)的主墨盒(200)，以及副墨盒(300)，其特征在于：
    所述副墨盒(300)由第一墨盒(310)和第二墨盒(320)构成；
    第一墨盒(310)具有与供墨端(201)连接的第一入口(311)，与进墨端(101)连接的第一出口(312)，与第二墨盒(320)连接的第三入口(313)，在出墨端(102)与第一入口(311)之间设有供墨泵(400)；
    第二墨盒(320)具有与出墨端(102)连接的第二入口(321)，与第三入口(313)连接的第二出口(322)，在第二出口(322)与第三入口(313)之间设有循环泵(500)。
  2. 根据权利要求1所述的适用于循环式打印头的墨水循环系统，其特征在于：所述第一墨盒(310)还设有用于控制供墨泵(400)的液位检测装置(314)和用于控制供墨泵(400)和循环泵(500)的液位保护装置(315)。
  3. 根据权利要求2所述的适用于循环式打印头的墨水循环系统，其特征在于：所述第一墨盒(310)还设有第一压力检测装置(316)。
  4. 根据权利要求1所述的适用于循环式打印头的墨水循环系统，其特征在于：所述第一墨盒(310)还设有工作时导通、不工作时关闭的第一控制阀(317)。
  5. 根据权利要求1所述的适用于循环式打印头的墨水循环系统，其特征在于：第一出口(312)设置在第一墨盒(310)底部，所述供墨泵(400)和循环泵(500)共同控制，工作时第一墨盒(310)内的液位位于第三入口(313)的高度。
  6. 根据权利要求1至5任一项所述的适用于循环式打印头的墨水循环系统，其特征在于：所述第二墨盒(320)还设有控制循环泵(500)的第二压力检测装置(323)。
  7. 根据权利要求6所述的适用于循环式打印头的墨水循环系统，其特征在于：所述第二墨盒(320)还设有工作/不工作时关闭、清洗时导通的第二控制阀(324)。
  8. 根据权利要求1至5任一项所述的适用于循环式打印头的墨水循环系统，其特征在于：在出墨端(102)与第一入口(311)之间还设有供墨过滤器(410)，在第二出口(322)与第三入口(313)之间还设有循环过滤器(510)，所述循环过滤器(510)还通过第三控制阀(511)联通主墨盒(200)。
  9. 根据权利要求1至5任一项所述的适用于循环式打印头的墨水循环系统，其特征在于：每种打印墨水包括多个循环式打印头(100)，第一墨盒(310)和第二墨盒(320)呈长条形墨埠结构，分别具有多个第一出口(312)和多个第二入口(321)逐一连接各个循环式打印 头(100)。
  10. 根据权利要求9所述的适用于循环式打印头的墨水循环系统，其特征在于：所述多个第二入口(321)在呈长条形墨埠结构的第二墨盒(320)上分布于同一高度上。
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