CN108162601B - Ink supply constant negative pressure device of digital printer - Google Patents
Ink supply constant negative pressure device of digital printer Download PDFInfo
- Publication number
- CN108162601B CN108162601B CN201711429474.8A CN201711429474A CN108162601B CN 108162601 B CN108162601 B CN 108162601B CN 201711429474 A CN201711429474 A CN 201711429474A CN 108162601 B CN108162601 B CN 108162601B
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- CN
- China
- Prior art keywords
- negative pressure
- ink
- pressing block
- top cover
- digital printer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17503—Ink cartridges
- B41J2/17556—Means for regulating the pressure in the cartridge
-
- 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
- B41J2/17503—Ink cartridges
- B41J2/17506—Refilling of the cartridge
- B41J2/17509—Whilst mounted in the printer
Landscapes
- Ink Jet (AREA)
Abstract
The invention discloses an ink supply constant negative pressure device of a digital printer, which comprises a vacuum pump, a one-way valve, a negative pressure retaining device, a secondary protecting device, a secondary ink bag device, an ink pump, an ink box and a spray head, wherein the vacuum pump, the one-way valve, the negative pressure retaining device, the secondary protecting device, the secondary ink bag device, the ink pump and the ink box are sequentially connected, and the secondary ink bag device is also connected with the spray head; the negative pressure top cover and the negative pressure bottom cover are fixedly connected with a spring through a check ring, the lower end of the guide post is fixedly connected with a pressing block, the lower end of the pressing block is provided with a diaphragm, and the diaphragm is fixedly arranged on the negative pressure bottom cover. According to the invention, by adding the pressing block and counteracting the pressure of the negative pressure by virtue of the gravity of the pressing block, the rigidity of the spring is reduced, more air variation is provided under the condition of ensuring the constant pressure, and the stability of a negative pressure system is improved. And the volume of the negative pressure holding device is reduced.
Description
Technical Field
The invention relates to the field of digital printing, in particular to an ink supply constant negative pressure device of a digital printing machine.
Background
Along with the continuous development of digital printing, the requirements of people on the digital printing machine are higher and higher, in order to enable a spray head to print for a long time without blocking and ink seepage, the ink in a spray hole of the spray head needs to form a meniscus on the surface of the spray head, the condition of forming the meniscus is that a negative pressure is formed in a secondary ink bag, the ink is supported by virtue of atmospheric pressure, when the negative pressure is overlarge, the working pressure of the spray head is insufficient to offset the atmospheric pressure, the ink cannot be sprayed out, and the spray head is blocked; when the negative pressure is too small, the atmospheric pressure is enough to offset the pressure generated by the ink by gravity, and the ink seeps out; if the negative pressure is unstable, the print quality is affected.
In the prior art, one scheme is to pump air through a vacuum pump, and simultaneously adjust the speed of pumping air by a throttle valve to keep the stability of the internal pressure of the ink supply system. Another proposal is to arrange a cylinder outside, and the cylinder volume is increased to keep the internal pressure of the ink supply system stable; when the first scheme is started, not only the size of the throttle valve is required to be manually adjusted, but also the fluctuation of the output air flow is caused when the vacuum pump works, so that the negative pressure is unstable; the second scheme is not easy to install and place due to the overlarge negative pressure cylinder, so that space is wasted and attractive appearance is affected.
Disclosure of Invention
The invention aims to provide an ink supply constant negative pressure device of a digital printer, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the ink supply constant negative pressure device of the digital printer comprises a vacuum pump, a one-way valve, a negative pressure retaining device, a secondary protective device, a secondary ink bag device, an ink pump, an ink box and a spray head, wherein the vacuum pump, the one-way valve, the negative pressure retaining device, the secondary protective device, the secondary ink bag device, the ink pump and the ink box are sequentially connected, the spray head is also connected to the secondary ink bag device, the vacuum pump provides a stable power source for the negative pressure retaining device, the one-way valve can prevent external air pressure from entering the negative pressure retaining device when the vacuum pump stops working, the ink pump pumps ink in the ink box into the secondary ink bag device, the secondary ink bag device is used for supplying ink to the spray head, and the secondary protective device can prevent a certain hole position liquid level sensor inside the secondary ink bag device from malfunctioning, so that the ink flows into a second barrier of the negative pressure retaining device; the negative pressure maintaining device comprises a negative pressure top cover, a negative pressure cylinder and a negative pressure bottom cover, wherein a negative pressure sensor is embedded and installed on the negative pressure top cover, the negative pressure sensor is used for detecting the internal pressure of the negative pressure maintaining device, a plurality of groups of air pipe joints are further arranged at the top of the negative pressure top cover, a vacuum pump and a secondary ink bag device are connected with the negative pressure maintaining device through the air pipe joints, a guide pillar is further arranged between the negative pressure top cover and the negative pressure bottom cover, the lower end of the guide pillar is fixedly connected with a spring through a retainer ring, the lower end of the spring is fixedly connected with a pressing block, the pressing block is used for counteracting most of the internal negative pressure of the negative pressure maintaining device, a diaphragm is arranged at the lower end of the pressing block and is fixedly installed on the negative pressure bottom cover, and the diaphragm is used for sensing the internal volume change of the negative pressure maintaining device.
As a further scheme of the invention: and a sealing ring A is arranged between the negative pressure top cover and the negative pressure cylinder.
As still further aspects of the invention: and a sealing ring B is arranged between the negative pressure cylinder and the negative pressure bottom cover.
Compared with the prior art, the invention has the beneficial effects that: the invention adds the pressing block and depends on the gravity of the pressing block to resist
The negative pressure is eliminated, the rigidity of the spring is reduced, more air variation is provided under the condition of ensuring the constant pressure, and the stability of a negative pressure system is improved. And the volume of the negative pressure holding device is reduced.
Drawings
Fig. 1 is a schematic diagram of the whole structure of an ink supply constant negative pressure device of a digital printer.
Fig. 2 is a schematic structural view of a negative pressure maintaining device in an ink supply constant negative pressure device of a digital printer.
Fig. 3 is a schematic view of the structure of the negative pressure maintaining device in the ink supplying constant negative pressure device of the digital printer when being installed.
Fig. 4 is a schematic diagram of the structure of the negative pressure maintaining device in the ink supply constant negative pressure device of the digital printer when working.
In the figure, 1-vacuum pump, 2-check valve, 3-negative pressure holding device, 4-secondary protection device, 5-secondary ink bag device, 6-ink pump, 7-ink cartridge, 8-nozzle, 301-negative pressure sensor, 302-air pipe joint, 303-negative pressure top cover, 304-sealing ring A, 305-guide pillar, 306-negative pressure cylinder, 307-retainer ring, 308-spring, 309-pressing block, 310-diaphragm, 311-sealing ring B, 312-negative pressure bottom cover
Description of the embodiments
The technical scheme of the patent is further described in detail below with reference to the specific embodiments.
Referring to fig. 1-4, an ink supply constant negative pressure device of a digital printer comprises a vacuum pump 1, a one-way valve 2 and a negative pressure protector
The device comprises a holding device 3, a secondary protection device 4, a secondary ink bag device 5, an ink pump 6, an ink box 7 and a spray head 8, wherein the vacuum pump 1, the one-way valve 2, the negative pressure holding device 3, the secondary protection device 4, the secondary ink bag device 5, the ink pump 6 and the ink box 7 are sequentially connected, the spray head 8 is further connected to the secondary ink bag device 5, the vacuum pump 1 provides a stable power source for the negative pressure holding device 3, the one-way valve 2 can prevent external air pressure from entering the negative pressure holding device 3 when the vacuum pump 1 stops working, the ink pump 6 pumps ink in the ink box 7 into the secondary ink bag device 5, the secondary ink bag device 5 is used for supplying ink to the spray head 8, and the secondary protection device 4 can prevent a certain hole position liquid level sensor inside the secondary ink bag device 5 from malfunctioning, so that the ink flows into a second barrier of the negative pressure holding device 3; the negative pressure maintaining device 3 comprises a negative pressure top cover 303, a negative pressure barrel 306 and a negative pressure bottom cover 312, a sealing ring A304 is arranged between the negative pressure top cover 303 and the negative pressure barrel 306, a sealing ring B311 is arranged between the negative pressure barrel 306 and the negative pressure bottom cover 312, the sealing ring A304 and the sealing ring B311 both play a sealing role, a negative pressure sensor 301 is embedded and installed on the negative pressure top cover 303, the negative pressure sensor 301 is used for detecting the device of the internal pressure of the negative pressure maintaining device 3, a plurality of groups of air pipe joints 302 are further arranged at the top of the negative pressure top cover 303, a guide pillar 305 is further arranged between the negative pressure top cover 303 and the negative pressure bottom cover 312, the lower end of the guide pillar 305 is fixedly connected with a spring 308 through a retainer ring 307, the lower end of the spring 308 is fixedly connected with a pressing block 309, the pressing block 309 is used for counteracting most of the internal negative pressure generated by the negative pressure maintaining device 3, a diaphragm 310 is arranged at the lower end of the pressing block 309, the diaphragm 310 is fixedly installed on the negative pressure bottom cover 312, and the diaphragm 310 is used for sensing the internal volume change of the negative pressure maintaining device 3.
The working principle of the invention is as follows: when the ink supply system is started, the vacuum pump 1 starts to work, air in the negative pressure holding device 3, the secondary protection device 4 and the secondary ink bag device 5 is pumped, the diaphragm 310 starts to indent, meanwhile, the pressing block 309 and the spring 308 are supported, a negative pressure system is formed inside the whole ink supply system, the negative pressure sensor 301 outputs internal pressure change to the PLC through voltage change, and when the PLC detects that the internal negative pressure of the negative pressure holding device 3 reaches a given maximum value, the vacuum pump 1 stops working.
When the digital printer starts to print, the internal negative pressure changes due to the change in the volume of the ink in the secondary ink bag device 5 and the permeation of gas occurring during operation and the tiny air holes caused by the ink pump 6, and at the same time, in order to reduce the negative pressure change caused by the above reasons, the diaphragm 310 in the negative pressure holding device 3 lifts the pressing block 309 back down, the spring 308 rebounds, the internal negative pressure of the whole system is maintained by changing the internal volume of the whole device, and when the negative pressure of the whole device drops to a given minimum value, the vacuum pump 1 operates again.
The negative pressure holding device 3 reduces the rigidity of the spring 308 by adding a pressing block 309; when the negative pressure maintaining device 3 works, the diaphragm 310 receives upward tensile force PA (P is negative pressure in the negative pressure system, a is the stress area of the diaphragm), and simultaneously receives downward force mg+kx (M is the weight of the pressing block 309, k is the rigidity of the spring 308, and x is the expansion value of the spring), namely pa=mg+kx, and the magnitude of the negative pressure in the printing process is the sum of the gravity of the ink and the force required for forming the meniscus, but the change value is small for stable printing; then according to the formula PV=nRT of the gas and the pressure, when the whole ink supply system has gas permeation, the larger the volume which can be changed in the negative pressure system is, the more stable the negative pressure is; the device of the present invention thus relies on the weight of the pressure block 309 to counteract the pressure created by most of the negative pressure, resulting in a smaller spring 308 stiffness.
While the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and variations may be made within the knowledge of those skilled in the art without departing from the spirit of the present patent.
Claims (3)
1. The utility model provides a invariable negative pressure device of digital printer ink feed, includes vacuum pump (1), check valve (2), negative pressure holding device (3), secondary protection device (4), secondary ink sac device (5), ink pump (6), ink horn (7) and shower nozzle (8), its characterized in that: the vacuum pump (1), the one-way valve (2), the negative pressure retaining device (3), the secondary protection device (4), the secondary ink bag device (5), the ink pump (6) and the ink box (7) are sequentially connected, and the secondary ink bag device (5) is also connected with a spray head (8); the negative pressure maintaining device (3) comprises a negative pressure top cover (303), a negative pressure barrel (306) and a negative pressure bottom cover (312), a negative pressure sensor (301) is embedded and installed on the negative pressure top cover (303), a plurality of groups of air pipe joints (302) are further arranged at the top of the negative pressure top cover (303), a one-way valve (2) is connected with the negative pressure maintaining device (3) through one group of air pipe joints, a second-level protecting device (4) is connected with the negative pressure maintaining device (3) through another group of air pipe joints, a guide pillar (305) is further arranged between the negative pressure top cover (303) and the negative pressure bottom cover (312), the lower end of the guide pillar (305) is fixedly connected with a spring (308) through a check ring (307), a pressing block (309) is fixedly connected with the lower end of the spring (308), and the pressing block (309) is used for counteracting the pressure generated by most of negative pressure by means of gravity of the pressing block (309), and a diaphragm (310) is arranged at the lower end of the pressing block (309) and is fixedly installed on the negative pressure bottom cover (312).
2. The ink supply constant negative pressure device of a digital printer according to claim 1, wherein: a sealing ring A (304) is arranged between the negative pressure top cover (303) and the negative pressure barrel (306).
3. The ink supply constant negative pressure device of a digital printer according to claim 1, wherein: a sealing ring B (311) is arranged between the negative pressure barrel (306) and the negative pressure bottom cover (312).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711429474.8A CN108162601B (en) | 2017-12-26 | 2017-12-26 | Ink supply constant negative pressure device of digital printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711429474.8A CN108162601B (en) | 2017-12-26 | 2017-12-26 | Ink supply constant negative pressure device of digital printer |
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| Publication Number | Publication Date |
|---|---|
| CN108162601A CN108162601A (en) | 2018-06-15 |
| CN108162601B true CN108162601B (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711429474.8A Active CN108162601B (en) | 2017-12-26 | 2017-12-26 | Ink supply constant negative pressure device of digital printer |
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| CN (1) | CN108162601B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109334238A (en) * | 2018-10-30 | 2019-02-15 | 青岛蓝谷川上工业科技有限公司 | A kind of intaglio printing ink-jet digital printer |
| CN111409366B (en) * | 2020-04-24 | 2023-12-22 | 广州番麦光电仪器有限公司 | Automatic regulating ink supply system and negative pressure regulating method for vacuum negative pressure of printing head |
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| CN108162601A (en) | 2018-06-15 |
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Address after: No. 101, No. 7, Fengshun Road, Tongxin Community, Baolong Street, Longgang District, Shenzhen City, Guangdong Province, 518000 Applicant after: Shenzhen Wande Digital Technology Co.,Ltd. Address before: 518000 No.5 Fumin Road, Fumin Industrial Zone, Pinghu street, Longgang District, Shenzhen City, Guangdong Province Applicant before: SHENZHEN WONDER PRINTING SYSTEM Co.,Ltd. |
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