A digital inkjet device and inkjet method for producing honeycomb panels

Abstract

The invention relates to the field of digital inkjet, and discloses a digital inkjet device for producing honeycomb panels, comprising an inkjet head, wherein a nozzle and a liquid collecting pipe are installed inside the inkjet head, the liquid collecting pipe comprises a vertical section 1, a vertical section 2 and a connecting section for connecting the two, initially, the vertical sections are coaxially located below a nozzle hole of the nozzle, an ink tube is connected to the side of the nozzle, a liquid return branch pipe 1 is connected to the upper end, a three-way valve 1 is arranged at the end of the liquid return branch pipe 1, three ports of the three-way valve 1 are respectively connected to a liquid return main pipe, a liquid return branch pipe 1 and a liquid return branch pipe 2, a water pump 1 is connected to the end of the liquid return main pipe, a cleaning mechanism is arranged inside the inkjet head, the cleaning mechanism comprises a movable seat, the vertical section 2 is connected to the movable seat, a needle sleeve is fixed in the liquid collecting pipe through a plurality of inner brackets, a steel needle is installed in the needle sleeve, one end of the steel needle is located at the upper opening of the vertical section 1 and is sharp, and the other end is provided with a connecting shaft after passing through the liquid collecting pipe.

Description

Technical Field

[0001] The invention relates to the technical field of digital inkjet, and in particular to a digital inkjet device and an inkjet method for producing honeycomb panels. Background Art

[0002] The working principle of digital inkjet is to apply external force to the ink so that it is sprayed onto the object through the nozzle to form a color dot, and at the same time, it is coordinated with the movement in the XY direction to form the desired pattern. Digital inkjet is divided into continuous jetting and on-demand jetting. Among them, the former is to apply high-frequency oscillation pressure to the ink so that the ink is sprayed from the nozzle to form a uniform and continuous stream of droplets. A deflection electric field that changes synchronously with the graphic photoelectric conversion signal is provided at the nozzle. The ejected ink droplets are selectively charged in the charging electric field. When the ink droplets pass through the deflection electric field, the charged ink droplets are deflected under the action of the deflection electric field, and the uncharged ink droplets continue to fly in a straight line. The ink droplets flying in a straight line are recovered by the liquid collector, and the charged ink droplets are sprayed onto the object.

[0003] In the existing continuous jet digital inkjet technology, the nozzle needs to be cleaned regularly according to the working conditions to ensure that the nozzle is not blocked and can operate normally to print the desired pattern. After searching, a Chinese utility model patent with publication number CN216783083U was found, which discloses a nozzle cleaning and maintenance device for a digital inkjet machine. It achieves the purpose of dredging by flashing the nozzle holes of the nozzle, and achieves the purpose of cleaning by scraping the ink on the nozzle surface. When the equipment is not used for a long time, the sponge is tightly attached to the sealing cavity and the bottom of the nozzle to achieve the purpose of protection. However, it still has some shortcomings. Insufficient points: 1. The flash spray action can only clean some nozzle blockages that are not stubbornly attached. When the ink inside the nozzle hole condenses and stubbornly adheres due to long-term non-use, it is difficult to unclog the nozzle hole by simply relying on the flash spray action, or it needs a long period of flash spray action to achieve unclogging. The dredging effect and efficiency are poor and need to be improved; 2. During the protection process of the equipment not in use for a long time, simply relying on the close sealing method, although it can prevent external dust from entering and clogging the nozzle hole, the ink remaining in the nozzle will also gradually condense and block the nozzle hole, which needs to be improved.

[0004] Based on the above, the present invention proposes a digital inkjet device and inkjet method for producing honeycomb panels. Summary of the invention

[0005] In order to solve the problems mentioned in the above background, the present invention provides a digital inkjet device and inkjet method for producing honeycomb panels.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows.

[0007] A digital inkjet device for producing honeycomb panels comprises an inkjet stand and an inkjet head arranged on the inkjet stand, a nozzle and a liquid collecting pipe are installed inside the inkjet head, the liquid collecting pipe comprises a vertical section 1, a vertical section 2 and a connecting section for connecting the two, initially, the vertical sections are coaxially located below the nozzle hole of the nozzle, an ink tube is connected to the side of the nozzle, a liquid return branch pipe 1 is connected to the upper end, a three-way valve 1 is arranged at the end of the liquid return branch pipe 1, three ports of the three-way valve 1 are respectively connected to the liquid return main pipe, the liquid return branch pipe 1 and the liquid return branch pipe 2, the three-way valve 1 is used to make the liquid return main pipe connected to the liquid return branch pipe 1 or the liquid return branch pipe 2 alone, and a water pump 1 is connected to the end of the liquid return main pipe;

[0008] A cleaning mechanism is provided in the inkjet head, and the cleaning mechanism includes a movable seat that can move in the vertical direction. The vertical section two is rotatably connected to the movable seat. A needle sleeve is fixedly provided in the liquid collecting tube by a plurality of internal brackets. A steel needle is installed in the needle sleeve. The steel needle can move in the needle sleeve. One end of the steel needle is located at the upper opening of the vertical section one and is sharp, and the other end is provided with a connecting shaft after passing through the liquid collecting tube. The connecting shaft can move in the vertical direction.

[0009] Furthermore, the cleaning mechanism also includes a linear module for driving the movable seat to move, the movable seat is provided with a motor for driving the vertical section 2 to rotate around the axis direction, the movable seat is provided with an electric telescopic rod, and the output end of the electric telescopic rod is connected to the connecting shaft through a bearing.

[0010] Furthermore, the upper end of the vertical section 2 of the liquid collecting pipe is connected to the liquid inlet pipe through a joint, and a three-way valve 2 is provided at the end of the liquid inlet pipe. The three ports of the three-way valve 2 are respectively connected to the liquid inlet pipe, the water injection pump and the water pump 2. The liquid inlet end of the water injection pump is connected to the water tank, and the liquid outlet end of the water pump 2 is connected to the waste liquid tank. The three-way valve 2 is used to connect the liquid inlet pipe to the water injection pump or the water pump 2 separately.

[0011] Furthermore, the cleaning mechanism also includes a cleaning component for cleaning the pipe opening of the vertical section 1 of the liquid collecting pipe.

[0012] Furthermore, the cleaning component includes a fixed bracket arranged in the inkjet head, and two closing seats arranged opposite to each other are slidably installed on the fixed bracket along a direction perpendicular to the vertical section 1 of the collecting tube. A side area is respectively arranged on the opposite sides of the two closing seats. When the two closing seats are in contact with each other, the two side areas together form a cleaning area and there is a through hole at the bottom of the cleaning area. When the collecting tube rotates one hundred and eighty degrees, the vertical section 1 of the collecting tube is coaxial with the through hole and a sealing fit can be formed between the two.

[0013] Furthermore, a spring is provided between the closing seat and the fixed bracket, and two springs are provided accordingly. Under the elastic force of the two springs, the two closing seats move away from each other;

[0014] A driving seat is slidably installed on the fixed bracket along the vertical direction, and a slope one is arranged on the driving seat. A slope two is arranged at the bottom of the closing seat, and the slope two is fitted with the slope one. There are two corresponding slopes one, and the distance between the two slopes one increases from bottom to top. A protruding rod is arranged on the side of the driving seat, and when the collecting pipe rotates one hundred and eighty degrees, the protruding rod is located above the connecting section of the collecting pipe.

[0015] Furthermore, a side nozzle connected to the side area is arranged on the side of the closing seat, and the ends of the side nozzles of the two closing seats are connected to side tubes, and the two side tubes are both connected to the second liquid return branch pipe.

[0016] Furthermore, an inner partition extends from the upper wall of the side zone, and there is a gap between the bottom of the inner partition and the lower wall of the side zone. When the pipe mouth of the vertical section 1 of the liquid collecting pipe extends into the cleaning area, the outer circular surface of the vertical section 1 is close to the inner partition.

[0017] An inkjet method for a digital inkjet device for producing honeycomb panels, including an inkjet process and a nozzle cleaning process:

[0018] The inkjet process is consistent with the existing digital inkjet technology and will not be described in detail.

[0019] Nozzle cleaning process:

[0020] Step 1: The solenoid valve on the ink tube is closed, the three-way valve 1 connects the liquid return branch pipe 1 with the liquid return main pipe, the three-way valve 2 connects the water injection pump with the liquid inlet pipe, the movable seat moves and makes the upper end of the vertical section 1 of the liquid collecting pipe fit with the bottom of the nozzle, and the liquid collecting pipe is kept connected with the nozzle hole;

[0021] Step 2: The water pump 1 and the water injection pump are started at the same time, and the steel needle reciprocates to continuously puncture the blockage in the spray hole. The water injection pump draws the water as the cleaning medium to the blockage in the spray hole, and the water pump 1 draws the water in the nozzle away. This continues to clear the spray hole of the nozzle;

[0022] Step 3: After the dredging and cleaning is completed, the water in the nozzle is pumped out by the water pump 1, the three-way valve 2 connects the water pump 2 with the liquid inlet pipe in advance, the liquid collecting pipe moves down and the water in the liquid collecting pipe is pumped out by the water pump 2;

[0023] Step 4: When the digital inkjet device is not in use, fit the liquid collecting tube to the nozzle and extend the steel needle into the nozzle hole.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. This solution improves the nozzle and liquid collecting tube of the digital inkjet device, and can clear and clean the nozzle through the liquid collecting tube and the steel needle in the liquid collecting tube. Furthermore, the steel needle reciprocates to continuously puncture the blockage in the nozzle's spray hole, and the water injection pump draws the water as the cleaning medium to rush to the blockage in the spray hole. The water pump draws the water in the nozzle, and this continues to clear and clean the nozzle's spray hole. On the one hand, compared with removing the nozzle for cleaning or simply flashing, in this solution, the method of puncturing and flushing at the same time can more easily and quickly clear and clean the nozzle, and both the nozzle's spray hole and the nozzle's inner cavity area can be cleaned, and the cleaning effect is better. On the other hand, during the clearing and cleaning process, since the water medium flows from bottom to top, the steel needle will be cleaned synchronously, and no ink will remain on the steel needle. After the cleaning is completed, the water medium can also be drawn away, so the nozzle and the liquid collecting tube can be put into use in time.

[0026] In addition, when the equipment is not used for a long time, the liquid collecting tube can be fitted with the nozzle, and the steel needle can be inserted into the spray hole of the nozzle. On the one hand, the nozzle can be blocked by the liquid collecting tube to prevent external dust from entering the nozzle. On the other hand, ink will inevitably remain in the nozzle, and the residual ink will inevitably gather in the spray hole under the action of gravity. If there is no steel needle, this part of the residual ink will easily block the spray hole after condensation. On the contrary, with the steel needle inserted into the spray hole, when the equipment is ready to be reused, it is only necessary to drive the steel needle away from the spray hole. Then, the water medium can pass through the hole left by the steel needle, making it more convenient and quick to flush and rinse the hole. Combined with the reciprocating puncture of the steel needle, it can achieve faster unblocking and cleaning, so that the equipment can be put into use faster.

[0027] 2. This solution uses a cleaning component to flush the liquid collecting pipe orifice. The setting of the internal baffle, on the one hand, enables the flowing water medium to flush not only the liquid collecting pipe, but also the outer surface of the upper pipe orifice of the vertical section 1, so that the cleaning is more thorough. On the other hand, this cleaning method does not require a large cleaning area, reducing the volume of the cleaning area. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 This is a schematic diagram of the inside of the inkjet head during normal inkjet use;

[0030] Figure 3 A schematic diagram of the interior of the inkjet head when cleaning the nozzle of the liquid collecting tube;

[0031] Figure 4 Schematic diagram of the inside of the inkjet head when cleaning the nozzle to unclog it;

[0032] Figure 5It is a partial schematic diagram of the internal structure of the inkjet head;

[0033] Figure 6 is a cross-sectional view of the nozzle;

[0034] Figure 7 It is a schematic diagram of the movable seat and the liquid collecting pipe;

[0035] Figure 8 It is a schematic diagram of the structure of the liquid collecting pipe;

[0036] Fig. 9 It is a partial schematic diagram of the liquid collecting pipe;

[0037] Fig.10 It is a schematic diagram of the structure of the cleaning component;

[0038] Fig.11 It is a cross-sectional view of the cleaning assembly and the liquid collecting pipe.

[0039] The reference numerals in the accompanying drawings are:

[0040] 100, inkjet stand; 101, inkjet head; 102, nozzle; 103, charging electric field; 104, deflection electric field; 105, liquid collecting pipe; 106, ink tube; 107, liquid return branch pipe 1; 108, three-way valve 1; 109, liquid return main pipe; 110, liquid return branch pipe 2; 200, cleaning mechanism; 201, linear module; 202, movable seat; 203, liquid inlet pipe; 204, motor; 205, electric telescopic rod; 206, inner bracket; 207, needle sleeve; 208, steel needle; 209, coupling; 210, joint; 211, fixed bracket; 212, closing seat; 213, driving seat; 214, protruding rod; 215, spring; 216, side nozzle; 217, inner partition. DETAILED DESCRIPTION

[0041] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0042] In this solution, the object to be inkjetted refers to a honeycomb panel.

[0043] Reference Figure 1-Figure 11 A digital inkjet device for producing honeycomb panels includes an inkjet frame 100 and an inkjet head 101 arranged on the inkjet frame 100. The core of this solution mainly involves the inkjet head 101. The remaining structures of the inkjet technology can be realized by existing technologies and will not be described in detail.

[0044] The inkjet head 101 is internally installed with a nozzle 102, a charging electric field 103 and a deflection electric field 104. The bottom of the inkjet head 101 is also provided with an escape port for avoiding the movement of ink droplets. In this solution, the existing continuous jet digital inkjet technology is adopted and will not be elaborated.

[0045] A liquid collecting tube 105 is also installed in the inkjet head 101. The liquid collecting tube 105 is the liquid collector in the digital inkjet technology, including a vertical section one, a vertical section two and a connecting section for connecting the two. Initially, the vertical section one is located directly below the nozzle 102. In this solution, the nozzle 102 sprays ink droplets vertically downward. Therefore, during the digital inkjet process, the uncharged ink droplets maintain a straight flight state and fall into the vertical section one of the liquid collecting tube 105.

[0046] A cleaning mechanism 200 is also provided in the inkjet head 101 for cooperating with the liquid collecting pipe 105 to clear and clean the nozzle 102 and the liquid collecting pipe 105, and to protect the nozzle 102 when the device is not in use.

[0047] Reference Figure 5 and Figure 6 The side of the nozzle 102 is connected to an ink tube 106, and the upper end is connected to a liquid return branch pipe 107. A three-way valve 108 is provided at the end of the liquid return branch pipe 107. The three-way valve 108 includes three ports, namely, an outlet and two inlets, wherein the outlet is connected to a liquid return main pipe 109, one inlet is connected to the liquid return branch pipe 107, and the other inlet is connected to a liquid return branch pipe 2 110. The two inlets can be connected to the outlet separately, which can be achieved by the existing technology and will not be elaborated. The end of the liquid return main pipe 109 is connected to a water pump 1 for sucking the fluid in the liquid return main pipe 109.

[0048] Reference Figure 5 The cleaning mechanism 200 includes a movable seat 202 and a linear module 201 for driving the movable seat 202 to move in a vertical direction. The linear module 201 can be realized by existing screw linear motion technology and will not be described in detail.

[0049] Reference Figure 7-Figure 9 The second vertical section of the collecting pipe 105 is rotatably connected to the movable seat 202, for example, through a bearing. The movable seat 202 is provided with a motor 204 for driving the second vertical section of the collecting pipe 105 to rotate around its own axis.

[0050] The upper end of the second vertical section of the liquid collecting pipe 105 is connected to the liquid inlet pipe 203 through a joint 210. A three-way valve 2 is provided at the end of the liquid inlet pipe 203. The three-way valve 2 includes three ports, one port is connected to the liquid inlet pipe 203, one port is connected to a water injection pump, and one port is connected to a second water pump. The liquid inlet end of the water injection pump is connected to a water tank, and the water tank is filled with a cleaning medium such as water. The liquid outlet end of the second water pump is connected to a waste liquid tank. The three-way valve 2, the water injection pump, the second water pump, the water tank and the waste liquid tank are not shown in the figure. The three-way valve 2 is used to enable the liquid inlet pipe 203 to be separately connected to the water injection pump or the second water pump.

[0051] A needle sleeve 207 is fixedly installed in the liquid collecting pipe 105 by a number of internal brackets 206, and a steel needle 208 is installed in the needle sleeve 207. One end of the steel needle 208 is located at the upper opening of the vertical section 1 of the liquid collecting pipe 105 and is sharp. The other end of the steel needle 208 is provided with a connecting shaft 209 after passing through the liquid collecting pipe 105. An electric telescopic rod 205 is provided on the movable seat 202, and its output end is connected to the connecting shaft 209 through a bearing, which is used to drive the connecting shaft 209 to move up and down. Since the steel needle 208 is made of steel wire or iron wire and has soft performance, when the connecting shaft 209 is driven to move up or down by the electric telescopic rod 205, the steel needle 208 can be driven to move down or up at the same time at the sharp end.

[0052] The cleaning mechanism 200 cooperates with the liquid collecting pipe 105 to act on the nozzle 102 in the following specific processes:

[0053] In normal use, the three-way valve 108 is closed, the uncharged ink droplets maintain a straight flight state and fall into the vertical section 1 of the liquid collecting pipe 105, and the charged ink droplets fall onto the object after passing through the deflection electric field, thereby realizing digital inkjet printing. At the same time, the three-way valve 2 connects the water pump 2 with the liquid inlet pipe 203, and the water pump 2 runs to pump out the ink in the liquid collecting pipe 105 through the liquid inlet pipe 203;

[0054] When regular cleaning or unblocking is required, inkjet is suspended first, the solenoid valve arranged on the ink tube 106 is closed, the three-way valve 108 connects the liquid return branch pipe 107 with the liquid return main pipe 109, the three-way valve 2 connects the water injection pump with the liquid inlet pipe 203, and the linear module 201 drives the movable seat 202 to move, so that the upper end of the vertical section 1 of the liquid collecting pipe 105 is tightly fitted with the bottom of the nozzle 102, and the liquid collecting pipe 105 is connected with the spray hole of the nozzle 102, and then the water pump 1, the water injection pump and the electric telescopic rod 205 are started at the same time, wherein the electric telescopic rod 205 drives the steel needle 208 to reciprocate, continuously puncturing the blockage in the spray hole, and the water injection pump draws the water as the cleaning medium to rush to the blockage in the spray hole, and the water pump 1 pumps the water in the nozzle 102 away, and this is continued for a long time. Now, for the dredging and cleaning of the spray hole of the nozzle 102, compared with removing the nozzle 102 for cleaning or simply flashing and spraying, in this scheme, the method of puncturing and flushing at the same time can achieve the dredging and cleaning of the nozzle 102 more easily and quickly, and both the spray hole of the nozzle 102 and the inner cavity area of ​​the nozzle 102 can be cleaned, and the cleaning effect is better. After the preset time, the cleaning is completed, the water in the nozzle 102 is pumped out by the water pump 1, the linear module 201 drives the liquid collecting pipe 105 to retreat, and the three-way valve 2 connects the water pump 2 with the liquid inlet pipe 203 in advance, and the water in the liquid collecting pipe 105 is pumped out by the water pump 2. In addition, during the dredging and cleaning process, since the water medium flows from bottom to top, the steel needle 208 will be cleaned synchronously, and no ink will remain on the steel needle 208;

[0055] When the device is not in use, the linear module 201 drives the liquid collecting tube 105 to fit with the nozzle 102, and the electric telescopic rod 205 drives the steel needle 208 to extend into the spray hole of the nozzle 102. On the one hand, the nozzle 102 is blocked by the liquid collecting tube 105 to prevent external dust from entering the nozzle 102. On the other hand, ink will inevitably remain in the nozzle 102, and the residual ink will inevitably gather in the spray hole under the action of gravity. If there is no steel needle 208, this part of the residual ink will easily block the spray hole after condensation. On the contrary, with the steel needle 208 extending into the spray hole, when the device is ready to be used again, it is only necessary to drive the steel needle 208 away from the spray hole. Then, there is a hole left by the steel needle 208, and the water medium can pass through the hole, so that the hole can be rinsed and flushed more conveniently and quickly. Combined with the reciprocating puncture of the steel needle 208, it can achieve faster unblocking and cleaning, so that the equipment can be put into use faster.

[0056] In a preferred embodiment, during normal use, uncharged ink droplets maintain a straight flight state and fall into the vertical section 1 of the collection tube 105, and charged ink droplets fall onto an object under the drive of the deflection electric field 104. In this process, it cannot be guaranteed that the ink droplets are correctly prepared to fall into the vertical section 1 of the collection tube 105 along the axis of the collection tube 105. Therefore, some ink droplets will have a certain offset, resulting in ink on the tube wall or outer surface of the upper tube mouth of the vertical section 1 of the collection tube 105. Therefore, it is necessary to clean the upper tube mouth of the vertical section 1 of the collection tube 105 to avoid bringing ink to the surface of the nozzle 102 during the subsequent unblocking and cleaning of the nozzle 102, causing negative effects. Based on this, refer to Figure 5 , the cleaning mechanism 200 also includes a cleaning component.

[0057] Specifically, refer to Fig.10 and Fig.11 The cleaning component includes a fixed bracket 211 arranged in the inkjet head 101, and two closing seats 212 arranged opposite to each other are slidably installed on the fixed bracket 211 along a direction perpendicular to the vertical section 1 of the liquid collecting pipe 105. A spring 215 is arranged between the closing seat 212 and the fixed bracket 211, and two springs 215 are correspondingly arranged. Under the elastic force of the two springs 215, the two closing seats 212 move away from each other.

[0058] A driving seat 213 is slidably mounted on the fixed bracket 211 along the vertical direction. A slope 1 is arranged on the driving seat 213. A slope 2 is arranged at the bottom of the closing seat 212. The slope 2 is in contact with the slope 1. Two slopes 1 are arranged correspondingly. The distance between the two slopes 1 increases from bottom to top. In addition, a protruding rod 214 is arranged on the side of the driving seat 213.

[0059] A side area is respectively provided on the opposite side of the two closing seats 212. When the two closing seats 212 are fitted together, the two side areas together form a cleaning area. There is a through hole at the bottom of the cleaning area. When the collecting pipe 105 rotates one hundred and eighty degrees, the vertical section one of the collecting pipe 105 is coaxial with the through hole and the protruding rod 214 is located above the connecting section of the collecting pipe 105. Afterwards, the movable seat 202 and the collecting pipe 105 are driven upward by the linear module 201. The connecting section of the collecting pipe 105 will push the protruding rod 214 upward to move upward together, thereby causing the driving seat 213 to move upward together. At the same time, the upper pipe opening of the vertical section one of the collecting pipe 105 will extend into the area between the two closing seats 212. When the two closing seats 212 are fitted together to form a cleaning area, the vertical section one and the through hole form a sealing fit.

[0060] A side nozzle 216 connected to the side area is provided on the side of the closing seat 212, and the ends of the side nozzles 216 of the two closing seats 212 are connected to side pipes, and the two side pipes are connected to the return liquid branch pipe 110; the upper pipe opening of the vertical section 1 of the collecting pipe 105 is located behind the cleaning area, and the three-way valve 108 connects the return liquid branch pipe 110 with the return liquid main pipe 109, and then, the water injection pump and the water pump 1 are started, the former draws the water medium through the collecting pipe 105 into the cleaning area, and the latter pumps the water in the cleaning area away, and the flowing water formed by the cooperation of the two is used to clean the upper pipe opening of the vertical section 1 of the collecting pipe 105.

[0061] Further, see Fig.11 An inner partition 217 extends from the upper wall of the side zone, and there is a gap between the bottom of the inner partition 217 and the lower wall of the side zone. When the upper pipe opening of the vertical section one of the collecting pipe 105 extends into the cleaning zone, the outer cylindrical surface of the vertical section one is close to the inner partition 217; its significance lies in that when cleaning the upper pipe opening of the vertical section one of the collecting pipe 105, the water medium flows into the cleaning zone through the upper pipe opening of the vertical section one, and then flows downward and flows into the side nozzle 216 through the gap. During this process, the flowing water medium can not only flush the collecting pipe 105, but also flush the outer surface of the upper pipe opening of the vertical section one, so that the cleaning is more thorough, and this cleaning method does not require a large cleaning area, thereby reducing the volume of the cleaning area.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A digital inkjet device for producing honeycomb panels, comprising an inkjet frame (100) and an inkjet head (101) arranged on the inkjet frame (100), wherein a nozzle (102) and a liquid collecting pipe (105) are installed inside the inkjet head (101), characterized in that: The liquid collecting pipe (105) comprises a vertical section 1, a vertical section 2 and a connecting section for connecting the two. Initially, the vertical section is coaxially located below the nozzle hole of the nozzle (102). The side of the nozzle (102) is connected to an ink tube (106), and the upper end is connected to a liquid return branch pipe 1 (107). The end of the liquid return branch pipe 1 (107) is provided with a three-way valve 1 (108). The three ports of the three-way valve 1 (108) are respectively connected to a liquid return main pipe (109), a liquid return branch pipe 1 (107) and a liquid return branch pipe 2 (110). The three-way valve 1 (108) is used to connect the liquid return main pipe (109) to the liquid return branch pipe 1 (107) or the liquid return branch pipe 2 (110). The end of the liquid return main pipe (109) is connected to a water pump 1. A cleaning mechanism (200) is arranged in the inkjet head (101), the cleaning mechanism (200) comprising a movable seat (202) capable of moving in a vertical direction, a second vertical section being rotatably connected to the movable seat (202), a needle sleeve (207) being fixedly arranged in the liquid collecting pipe (105) via a plurality of inner brackets (206), a steel needle (208) being installed in the needle sleeve (207), the steel needle (208) being capable of moving in the needle sleeve (207), one end of the steel needle (208) being located at the upper opening of the first vertical section and being sharp, and the other end of the steel needle (208) passing through the liquid collecting pipe ( 105) is provided with a connecting shaft (209), and the connecting shaft (209) can move in the vertical direction; the cleaning mechanism (200) further comprises a linear module (201) for driving the movable seat (202) to move, the movable seat (202) is provided with a motor (204) for driving the second vertical section to rotate around the axis center line direction, the movable seat (202) is provided with an electric telescopic rod (205), and the output end of the electric telescopic rod (205) is connected to the connecting shaft (209) through a bearing; the upper end of the second vertical section of the liquid collecting pipe (105) is connected to the connecting shaft (209) through a bearing; The joint (210) is connected to a liquid inlet pipe (203), a three-way valve 2 is arranged at the end of the liquid inlet pipe (203), three ports of the three-way valve 2 are respectively connected to the liquid inlet pipe (203), a water injection pump and a water pump 2, the liquid inlet end of the water injection pump is connected to a water tank, the liquid outlet end of the water pump 2 is connected to a waste liquid tank, and the three-way valve 2 is used to connect the liquid inlet pipe (203) to the water injection pump or the water pump 2 separately; the cleaning mechanism (200) further comprises a cleaning component for cleaning the pipe opening of the vertical section 1 of the liquid collecting pipe (105); the cleaning component comprises a cleaning component arranged in the inkjet head (101) A fixed bracket (211) is provided, wherein two closing seats (212) are slidably mounted on the fixed bracket (211) in a direction perpendicular to the vertical section 1 of the liquid collecting pipe (105), and are arranged facing each other. A side area is provided on each of the two closing seats (212) facing each other. When the two closing seats (212) are attached to each other, the two side areas together form a cleaning area, and a through hole is provided at the bottom of the cleaning area. When the liquid collecting pipe (105) is rotated 180 degrees, the vertical section 1 of the liquid collecting pipe (105) is coaxial with the through hole, and a sealing fit can be formed between the two. A side nozzle (216) communicating with the side area is arranged on the side of the closing seat (212); the ends of the side nozzles (216) of the two closing seats (212) are connected with side tubes; and both side tubes are communicated with the second liquid return branch pipe (110).

2. A digital inkjet device for producing honeycomb panels according to claim 1, characterized in that: A spring (215) is provided between the closing seat (212) and the fixed bracket (211), and two springs (215) are provided correspondingly. Under the elastic force of the two springs (215), the two closing seats (212) move away from each other; A driving seat (213) is slidably mounted on the fixed bracket (211) in a vertical direction, and a first inclined plane is provided on the driving seat (213). A second inclined plane is provided at the bottom of the closing seat (212), and the second inclined plane is in contact with the first inclined plane. Two corresponding inclined planes are provided, and the distance between the two first inclined planes increases from bottom to top. A protruding rod (214) is provided on the side of the driving seat (213), and when the liquid collecting pipe (105) rotates 180 degrees, the protruding rod (214) is located above the connecting section of the liquid collecting pipe (105).

3. A digital inkjet device for producing honeycomb panels according to claim 2, characterized in that: An inner baffle (217) extends from the upper wall of the side zone, and a gap exists between the bottom of the inner baffle (217) and the lower wall of the side zone. When the pipe opening of the vertical section 1 of the liquid collecting pipe (105) extends into the cleaning zone, the outer circumferential surface of the vertical section 1 is close to the inner baffle (217).

4. The inkjet method of a digital inkjet device for producing honeycomb panels according to claim 3, characterized in that: The method comprises an inkjet process and a nozzle (102) cleaning process, wherein the nozzle (102) cleaning process comprises the following steps: Step 1: the solenoid valve provided on the ink tube (106) is closed, the three-way valve 1 (108) connects the liquid return branch pipe 1 (107) with the liquid return main pipe (109), the three-way valve 2 connects the water injection pump with the liquid inlet pipe (203), the movable seat (202) moves to make the upper end of the vertical section 1 of the liquid collecting pipe (105) fit with the bottom of the nozzle (102), and the liquid collecting pipe (105) remains connected with the spray hole of the nozzle (102); Step 2: The water pump 1 and the water injection pump are started simultaneously, and the steel needle (208) reciprocates to continuously puncture the obstruction in the spray hole. The water injection pump draws water as a cleaning medium to flush the obstruction in the spray hole, and the water pump 1 pumps the water in the nozzle (102) away. This process is continued to clear the spray hole of the nozzle (102). Step 3: After the dredging and cleaning is completed, the water in the nozzle (102) is pumped out by the water pump 1, the three-way valve 2 is connected to the water pump 2 and the liquid inlet pipe (203) in advance, the liquid collecting pipe (105) is moved downward, and the water in the liquid collecting pipe (105) is pumped out by the water pump 2; Step 4: When the digital inkjet device is not in use, the liquid collecting tube (105) is fitted with the nozzle (102) so that the steel needle (208) extends into the spray hole of the nozzle (102).

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