Digital printing head with ink path circulation

Abstract

The invention provides an ink path circulating digital printing head which comprises an ink bag assembly, an ink guide plate assembly and a spray orifice piece, an ink outlet channel, an ink return channel and a connecting channel connecting the ink outlet channel and the ink return channel are arranged in the ink guide plate assembly, an ink outlet of the ink bag assembly is communicated with an inlet of the ink outlet channel, and an ink outlet of the ink bag assembly is communicated with an outlet of the ink return channel. An ink outlet of the ink outlet channel is communicated with an ink inlet of the orifice piece, the ink return channel is communicated with the ink outlet channel through the connecting channel, an ink outlet of the ink return channel is communicated with an ink return pipe, and a part of ink in the ink bag assembly flows into the orifice piece after passing through the ink outlet channel. The other part of the ink passes through the ink outlet channel, then flows into the ink return channel through the connecting channel and then circulates into the ink bag through the ink return pipe. According to the digital printing head with the ink path circulation function, in the ink circulation process, bubbles can flow into the ink return channel along with ink and are discharged out of the system through the ink return pipe, and the bubbles are prevented from entering the spray hole piece.

Description

Technical Field

[0001] The present invention relates to the field of printing technology, and particularly to a digital print head with an ink circuit circulation. Background Art

[0002] The description in this part only provides background information related to the disclosure of the present invention, and does not constitute prior art.

[0003] In the field of printing technology, when using high-viscosity ink (such as white ink), air bubbles will appear in the ink. Once the air bubbles enter the nozzle plate, it will cause nozzle blockage or uneven inkjet, thereby affecting the printing effect, resulting in phenomena such as broken lines, color differences or unclear images.

[0004] It should be noted that the above introduction of the technical background is only for the convenience of clearly and completely explaining the technical solution of the present invention and facilitating the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well-known to those skilled in the art just because these solutions are described in the background art part of the present invention. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a digital print head with an ink circuit circulation.

[0006] To solve the above technical problem, the present invention provides a digital print head with an ink circuit circulation. The digital print head includes an ink sac assembly, an ink guide plate assembly and a nozzle plate. The ink guide plate assembly has an ink outlet channel, an ink return channel and a connection channel connecting the ink outlet channel and the ink return channel. The ink outlet of the ink sac assembly is communicated with the inlet of the ink outlet channel. The ink outlet of the ink outlet channel is communicated with the ink inlet of the nozzle plate. The ink return channel is communicated with the ink outlet channel through the connection channel. The ink outlet of the ink return channel is communicated with an ink return pipe. A part of the ink in the ink sac assembly flows into the nozzle plate after passing through the ink outlet channel, and another part of the ink passes through the connection channel into the ink return channel after passing through the ink outlet channel, and then circulates back to the ink sac through the ink return pipe.

[0007] Preferably, the ink guide plate assembly includes an upper ink guide plate and a lower ink guide plate. A first ink path groove is formed on the upper surface of the upper ink guide plate, and a second ink path groove is formed on the lower surface of the upper ink guide plate. The end of the first ink path groove and the end of the second ink path groove are connected in series through a first channel. The first channel penetrates the upper ink guide plate vertically. A third ink path groove is formed on the upper surface of the lower ink guide plate. The second ink path groove and the third ink path groove are spliced vertically to form a horizontal ink path channel. A second channel is vertically formed through the lower ink guide plate. The upper end of the second channel is connected to one end of the third ink path groove away from the first channel. A third channel is also formed in the lower ink guide plate. The third channel and the second channel are connected through a connecting channel. A return ink hole is vertically formed through the upper ink guide plate. The third channel is spliced and aligned with the return ink hole. The first ink path groove, the first channel, the second ink path groove, the third ink path groove and the second channel are connected to form the ink outlet channel. After the third channel and the return ink hole are connected, the return ink channel is formed.

[0008] Preferably, the connecting channel is formed on the side wall of the lower ink guide plate, and the port of the connecting channel is closed by a plug.

[0009] Preferably, the ink sac assembly includes an ink path joint plate and a plurality of ink sacs installed on the ink path joint plate. A plurality of joints for installing ink sacs are provided on the ink path joint plate. A plurality of openings are formed on the lower surface of the ink path joint plate. The openings are butted against the first ink path groove of the upper ink guide plate. The openings and the first ink path groove are sealed by a first sealing ring. A filter screen is also provided between the openings and the first ink path groove.

[0010] Preferably, the nozzle plate is arranged on the lower side of the lower ink guide plate. The lower side of the second channel and the ink inlet of the nozzle plate are sealed by a second sealing ring.

[0011] Preferably, the digital print head further includes a temperature control device. There is an accommodation space between the upper ink guide plate and the lower ink guide plate. The temperature control device includes a water cooling box, which includes a water cooling box body and a bottom plate provided at the bottom of the water cooling box body. The water cooling box body and the bottom plate are accommodated in the accommodation space. The lower surface of the water cooling box body is provided with a water cooling channel. The water cooling box body is also provided with a water outlet and a water inlet. The two ends of the water cooling channel are respectively communicated with the water outlet and the water inlet. The bottom plate covers the bottom of the water cooling channel to seal the water cooling channel. The water cooling channel is a serpentine channel that bends back and forth. The water outlet is connected with a cooling water outlet pipe, and the water inlet is connected with a cooling water inlet pipe. The cooling water outlet pipe and the cooling water inlet pipe are communicated with a first pump body. The first pump body is used to control the circulation of cooling water. The water cooling box body is also provided with heat dissipation fins, and the heat dissipation fins are located outside the accommodation space.

[0012] Preferably, the temperature control device further includes a heating element. The heating element includes a heating rod. The lower ink guide plate is provided with an installation channel, and the heating rod is installed in the installation channel.

[0013] Preferably, the print head further includes a protective shell. The protective shell is installed on the upper side of the upper ink guide plate, and the ink sac of the print head is surrounded by the protective shell.

[0014] Preferably, the side wall of the protective shell is provided with heat dissipation holes. The inner wall of the protective shell is also installed with a heat dissipation fan. The heat dissipation fan is located at the position of the heat dissipation holes. The heat dissipation fan is used to discharge the heat in the protective shell to the outside of the protective shell through the heat dissipation holes.

[0015] Preferably, the temperature control device further includes a temperature controller. The temperature controller is used to control the pump body and the heat dissipation fan to start when the temperature inside the protective shell is greater than the highest set temperature, and to control the heating element to start when the temperature inside the protective shell is less than the lowest set temperature.

[0016] By means of the above technical solutions, the beneficial effects of the present invention are as follows:

[0017] For the digital print head with an ink path circulation of the present invention, an ink path circulation is formed by arranging an ink outlet channel, an ink return channel and a connection channel in the ink guide plate assembly. During the ink circulation process, air bubbles will flow into the ink return channel along with the ink and be discharged from the system through the ink return pipe, avoiding air bubbles from entering the nozzle plate. This design effectively solves the problem of air bubble blockage of the nozzles and improves the stability of the print head and the printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the digital print head of the present application.

[0019] Figure 2 It is a schematic diagram of a partial structure of the digital print head of the present application.

[0020] Figure 3 It is a schematic diagram of a partial structure of the digital print head of the present application.

[0021] Figure 4 It is an exploded structure schematic diagram of the ink cartridge assembly of the present application.

[0022] Figure 5 It is a schematic diagram of a sectional structure of the digital print head of the present application.

[0023] Figure 6 It is a schematic diagram of a sectional structure of the ink guide plate assembly of the present application.

[0024] Figure 7 It is an exploded structure schematic diagram of the ink guide plate assembly of the present application.

[0025] Figure 8 It is a schematic diagram of a partial structure of the digital print head of the present application.

[0026] Figure 9 It is a schematic diagram of a partial structure of the heat dissipation device of the present application.

[0027] Figure 10 It is an exploded structure schematic diagram of a part of the digital print head of the present application.

[0028] Figure 11 It is a schematic diagram of the structure of the digital print head of the present application.

[0029] Wherein: 1, ink return pipe; 2, ink cartridge assembly; 11, cooling water inlet pipe; 12, cooling water outlet pipe; 3, protective shell; 4, upper ink guide plate; 5, lower ink guide plate; 6, plug; 8, water cooling box;

[0030] 21, ink cartridge; 22, ink path joint plate; 23, filter screen; 24, first sealing ring;

[0031] 41, first ink path groove; 42, first channel; 43, second ink path groove; 44, ink return hole; 45, middle section; 46, first edge part; 47, upper notch; 48, connecting part;

[0032] 51, third ink path groove; 52, second channel; 53, connecting channel; 54, third channel; 55, accommodating space; 56, second edge part; 57, side notch;

[0033] 10, nozzle plate; 20, second sealing ring;

[0034] 81. Outlet; 82. Inlet; 83. Main body of water cooling box; 84. Heat sink; 85. Bottom plate; 86. Water cooling channel; 87. Cooling fan; 88. Heat dissipation hole; 9. Heating element. Detailed implementation manner

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] It should be noted that in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects, and there is no sequence between them, nor can they be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0037] As Figures 1-7 shown, the present invention provides a digital print head for ink circuit circulation. The digital print head includes an ink sac assembly 2, an ink guide plate assembly, and a nozzle plate 10. The ink guide plate assembly has an ink outlet channel, an ink return channel, and a connection channel 53 connecting the ink outlet channel and the ink return channel. The ink outlet of the ink sac assembly 2 is communicated with the inlet of the ink outlet channel. The ink outlet of the ink outlet channel is communicated with the ink inlet of the nozzle plate 10. The ink return channel is communicated with the ink outlet channel through the connection channel 53. The ink outlet of the ink return channel is communicated with the ink return pipe 1. A part of the ink in the ink sac assembly 2 flows into the nozzle plate 10 after passing through the ink outlet channel, and another part of the ink passes through the connection channel 53 after passing through the ink outlet channel and flows into the ink return channel, and then circulates back to the ink sac 21 through the ink return pipe 1. By providing an ink outlet channel, an ink return channel, and a connection channel 53 in the ink guide plate assembly, an ink circuit circulation is formed. During the ink circulation process, air bubbles will flow into the ink return channel along with the ink and be discharged from the system through the ink return pipe 1, preventing air bubbles from entering the nozzle plate 10. This design effectively solves the problem of air bubble blockage of the nozzles and improves the stability and printing quality of the print head.

[0038] The described ink guiding plate assembly includes an upper ink guiding plate 4 and a lower ink guiding plate 5. The upper surface of the upper ink guiding plate 4 is provided with a first ink path groove 41, and the lower surface of the upper ink guiding plate 4 is provided with a second ink path groove 43. The end of the first ink path groove 41 and the end of the second ink path groove 43 are connected end to end through a first channel 42. The first channel 42 penetrates the upper ink guiding plate 4 up and down. The upper surface of the lower ink guiding plate 5 is provided with a third ink path groove 51. The second ink path groove 43 and the third ink path groove 51 are spliced up and down to form a horizontal ink path channel. The lower ink guiding plate 5 is provided with a second channel 52 penetrating up and down. The upper end of the second channel 52 is connected to one end of the third ink path groove 51 away from the first channel 42. A third channel 54 is also provided in the lower ink guiding plate 5. The third channel 54 is connected to the second channel 52 through a connecting channel 53. The upper ink guiding plate 4 is also provided with a return ink hole 44 penetrating up and down. The third channel 54 is spliced and aligned with the return ink hole 44. The first ink path groove 41, the first channel 42, the second ink path groove 43, the third ink path groove 51 and the second channel 52 are interconnected to form the ink outlet channel. After the third channel 54 and the return ink hole 44 are interconnected, the return ink channel is formed. The connecting channel 53 is provided on the side wall of the lower ink guiding plate 5, and the port of the connecting channel is closed by a plug 6. The ink sac assembly 2 includes an ink path joint plate 22 and a plurality of ink sacs 21 installed on the ink path joint plate 22. A plurality of joints for installing the ink sacs 21 are provided on the ink path joint plate 22. The lower surface of the ink path joint plate 22 is provided with a plurality of openings. The openings are butted against the first ink path groove 41 of the upper ink guiding plate 4. The openings and the first ink path groove 41 are sealed by a first sealing ring 24. A filter screen 23 is also provided between the openings and the first ink path groove 41. The nozzle plate 10 is arranged on the lower side of the lower ink guiding plate 5. The lower side of the second channel 52 and the ink inlet of the nozzle plate are sealed by a second sealing ring 20.

[0039] As Figures 8-11As shown, the digital printing head further includes a temperature control device. There is an accommodation space 55 between the upper ink guide plate 4 and the lower ink guide plate 5. The temperature control device includes a water cooling tank 8, and the water cooling tank 8 includes a water cooling tank body 83 and a bottom plate 85 provided at the bottom of the water cooling tank body 83. The water cooling tank body 83 and the bottom plate 85 are accommodated in the accommodation space 55. A water cooling channel 86 is opened on the lower surface of the water cooling tank body 83. The water cooling tank body 83 is also provided with a water outlet 81 and a water inlet 82. The two ends of the water cooling channel 86 are respectively communicated with the water outlet 81 and the water inlet 82. The bottom plate 85 covers the bottom of the water cooling channel 86 to seal the water cooling channel 86. The water cooling channel 86 is a serpentine channel that bends back and forth. The water outlet 81 is connected to a cooling water outlet pipe 12, and the water inlet 82 is connected to a cooling water inlet pipe 11. The cooling water outlet pipe 12 and the cooling water inlet pipe 11 are communicated with a first pump body. The first pump body is used to control the circulation of cooling water. A heat sink 84 is also provided on the water cooling tank body 83, and the heat sink 84 is located outside the accommodation space 55. The temperature control device further includes a heating element 9, and the heating element 9 includes a heating rod. The lower ink guide plate 5 is provided with an installation channel, and the heating rod is installed in the installation channel. The printing head further includes a protective shell 3, and the protective shell 3 is installed on the upper side of the upper ink guide plate 4. The ink sac 21 of the printing head is surrounded by the protective shell 3. Heat dissipation holes 88 are opened on the side wall of the protective shell 3, and a heat dissipation fan 87 is further installed on the inner wall of the protective shell 3. The heat dissipation fan 87 is located at the position of the heat dissipation holes 88. The heat dissipation fan 87 is used to discharge the heat in the protective shell 3 to the outside of the protective shell 3 through the heat dissipation holes 88. The temperature control device further includes a temperature controller. The temperature controller is used to control the first pump body and the heat dissipation fan 87 to start when the temperature inside the protective shell 3 is greater than the highest set temperature, and control the heating element 9 to start when the temperature inside the protective shell 3 is less than the lowest set temperature. The introduction of the temperature controller enables the temperature control device to achieve intelligent and automatic temperature management, control the temperature of the printing head at 25°C to 35°C, effectively prevent overheating and overcooling, improve printing efficiency, and is suitable for high-precision and high-intensity printing application scenarios. The upper ink guide plate 4 and the lower ink guide plate 5 are made of graphite material, and the water cooling tank 8 is made of aluminum material.

[0040] As Figure 10As shown in the figure, the upper ink guide plate 4 is a plate-like structure, including a middle section 45, a first edge portion 46 provided on one side of the middle section 45, and two connecting portions 48 provided on the other side of the middle section 45. The first ink path groove 41 and the first channel 42 are opened in the middle section 45. The ink return hole 44 is opened in the first edge portion 46. The two connecting portions 48 extend from the other side of the middle section 45 to the side, and an upper notch 47 is formed between the two connecting portions 48. The lower ink guide plate 5 includes a second edge portion 56. The third ink path groove 51, the second channel 52, the connecting channel 53 and the third channel 54 are opened in the second edge portion 56. The first edge portion 46 and the second edge portion 56 are butted against each other. A receiving space 55 is formed by a downward depression on one side of the second edge portion 56, and the middle section 45 of the upper ink guide plate 4 covers the upper side of the receiving space 55. There is a side notch 57 on the side opposite to the second edge portion 56 in the receiving space 55. The water cooling box body 83 and the bottom plate 85 are received in the receiving space 55. The side edges of the heat sink 84 leak out from the side notch 57, and the upper ends of the heat sink 84 extend out from the upper notch 47. The two sides of the heat sink 84 have sheet-like ears, and the ears are located on the upper side of the connecting portions 48 and are mounted on the connecting portions 48. The cooling water inlet pipe 11 and the cooling water outlet pipe 12 extend out from the upper notch 47. This design makes full use of the space inside the print head, which can not only achieve the effect of ink path circulation, but also achieve the effect of temperature control, and makes the structure of the print head compact.

[0041] The above-described embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims

1. A digital printing head with ink circulation, characterized in that: The digital printing head comprises: Ink bag assembly, ink guide plate assembly and nozzle plate, The ink guide plate assembly has an ink outlet channel, an ink return channel, and a connecting channel connecting the ink outlet channel and the ink return channel. The ink outlet of the ink bag assembly is connected to the inlet of the ink outlet channel, the ink outlet of the ink outlet channel is connected to the ink inlet of the nozzle plate, the ink return channel is connected to the ink outlet channel through the connecting channel, and the ink outlet of the ink return channel is connected to the ink return tube. A part of the ink in the ink bag assembly flows into the nozzle plate through the ink outlet channel, and another part of the ink flows into the ink return channel through the connecting channel after passing through the ink outlet channel, and then circulates to the ink bag through the ink return pipe.

2. The digital printing head according to claim 1, characterized in that: The ink guide plate assembly comprises an upper ink guide plate and a lower ink guide plate. The upper surface of the upper ink guide plate is provided with a first ink path groove, the lower surface of the upper ink guide plate is provided with a second ink path groove, the end of the first ink path groove is connected with the end of the second ink path groove through a first channel, and the first channel passes through the upper ink guide plate from top to bottom. The upper surface of the lower ink guide plate is provided with a third ink path groove, the second ink path groove and the third ink path groove are spliced ​​up and down to form a horizontal ink path channel, the lower ink guide plate is provided with a second channel running through the upper and lower parts, the upper end of the second channel is connected with one end of the first channel of the principle of the third ink path groove, The lower ink guide plate is also provided with a third channel, and the third channel is connected to the second channel through a connecting channel. The upper ink guide plate is also provided with an ink return hole which runs through from top to bottom. The third channel is spliced ​​and aligned with the ink return hole. The first ink path groove, the first channel, the second ink path groove, the third ink path groove and the second channel are interconnected to form the ink outlet channel. After the third channel and the ink return hole are connected to each other, the ink return channel is formed.

3. The digital printing head according to claim 2, characterized in that: The connecting channel is opened on the side wall of the lower ink guide plate, and the port of the connecting channel is closed by a plug.

4. The digital printing head according to claim 2, characterized in that: The ink bag assembly includes an ink path joint plate and multiple ink bags installed on the ink path joint plate. The ink path joint plate is provided with multiple joints for installing ink bags. The lower surface of the ink path joint plate is provided with multiple openings. The openings are connected to the first ink path groove of the upper ink guide plate. The openings and the first ink path groove are sealed by a first sealing ring. A filter is also provided between the openings and the first ink path groove.

5. The digital printing head according to claim 2, characterized in that: The orifice plate is arranged at the lower side of the lower ink guide plate, and the lower side of the second channel and the ink inlet of the orifice plate are sealed by a second sealing ring.

6. The digital printing head according to claim 2, characterized in that: The digital print head also includes a temperature control device, a storage space is provided between the upper ink guide plate and the lower ink guide plate, the temperature control device includes a water cooling box, the water cooling box includes a water cooling box body and a bottom plate provided at the bottom of the water cooling box body, the water cooling box body and the bottom plate are accommodated in the storage space, a water cooling channel is provided on the lower surface of the water cooling box body, the water cooling box body is also provided with a water outlet and a water inlet, the two ends of the water cooling channel are respectively connected with the water outlet and the water inlet, the bottom plate covers the bottom of the water cooling channel to close the water cooling channel, The water cooling channel is a serpentine channel that bends back and forth. The water outlet is connected to a cooling water outlet pipe, the water inlet is connected to a cooling water inlet pipe, the cooling water outlet pipe and the cooling water inlet pipe are connected to the first pump body, the first pump body is used to control the cooling water circulation, and the water cooling box body is also provided with a heat sink, and the heat sink is located outside the accommodating space.

7. The digital printing head according to claim 6, characterized in that: The temperature control device further comprises a heating element, which comprises a heating rod. The lower ink guide plate is provided with an installation channel, and the heating rod is installed in the installation channel.

8. The digital printing head according to claim 7, characterized in that: The print head further comprises a protective shell, which is mounted on the upper side of the upper ink guide plate, and the ink bag of the print head is enclosed in the protective shell.

9. The digital printing head according to claim 8, characterized in that: The side wall of the protective shell is provided with heat dissipation holes, and the inner wall of the protective shell is also equipped with a heat dissipation fan, which is located at the position of the heat dissipation holes. The heat dissipation fan is used to discharge the heat in the protective shell to the outside of the protective shell through the heat dissipation holes.

10. The digital printing head according to claim 9, characterized in that: The temperature control device also includes a temperature controller, which is used to control the pump body and the cooling fan to start when the internal temperature of the protective shell is greater than the maximum set temperature, and to control the heating element to start when the internal temperature of the protective shell is less than the minimum set temperature.

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