Stop valve for controlling printing ink-jet circulation ink path and preventing ink from flowing back

Abstract

The utility model discloses a stop valve for preventing ink from flowing back for printing ink jet circulation ink path control, which relates to the technical field of printing ink jet and comprises an ink bag, the ink bag is connected with an ink jet printing head through a pipeline, and the ink jet printing head is connected with a circulation ink bag through a pipeline. The circulating ink bag is connected with the ink bag through a circulating pump and a pipeline; a circulation loop is formed among the ink bag, the ink-jet printing head and the circulation ink bag; the ink bag and the circulating ink bag are connected with the ink backflow stop valve through pipelines. The ink backflow stop valve on the ink bag is connected with the positive pressure device through a pipeline. And the ink backflow stop valve on the circulating ink bag is connected with the vacuum device through a pipeline. Through the arrangement of the ink backflow stop valve, the abnormal problem and device failure and damage caused by the fact that ink flows back into the positive and negative pressure device under the condition that positive and negative pressure control ink of a circulation ink path is out of control in the ink jet technology are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of printing inkjet, in particular to a cut-off valve for preventing ink backflow in the control of a printing inkjet circulation ink path. Background Technique

[0002] The existing control of the printing inkjet circulation ink path is as follows: for ink supply control, an ink supply pump extracts ink from the main ink bottle into the ink sac, and when the liquid level triggers the ink sac float switch, the ink supply pump stops supplying ink. For the positive and negative pressure liquid level circulation, a micro positive pressure is generated by a positive pressure device to squeeze the ink from the ink sac through the inner cavity of the inkjet print head and flow to the circulation ink sac. When the ink triggers the circulation ink sac float switch, a circulation pump pumps the ink into the ink sac to form an ink circulation, and the ink levels at the front and rear ends of the inkjet print head are maintained balanced and stable by adjusting the pressures at both ends of the positive pressure device and the vacuum device. However, in the case of accidental power failure of the positive pressure device or out-of-control of the positive and negative pressures, and the pressure imbalance at both ends, the ink will backflow and overflow from the positive pressure device and the vacuum device.

[0003] In the general technology of the industry, there are problems of ink backflow and overflow in the ink path control, which affect the inkjet working stability and safety of the print head and the pollution and damage of the positive and negative pressure devices by the ink. Content of the Utility Model

[0004] The purpose of the utility model is to provide a cut-off valve for preventing ink backflow in the control of a printing inkjet circulation ink path, and solve the following technical problems: the problems of ink backflow and overflow existing in the ink path control.

[0005] The purpose of the utility model can be realized by the following technical solutions:

[0006] A cut-off valve for preventing ink backflow in the control of a printing inkjet circulation ink path, comprising an ink sac, the ink sac is connected to an inkjet print head through a pipeline, the inkjet print head is connected to a circulation ink sac through a pipeline, and the circulation ink sac and the ink sac are connected through a circulation pump and a pipeline; a circulation loop is formed among the ink sac, the inkjet print head and the circulation ink sac;

[0007] Both the ink sac and the circulation ink sac are connected to an ink backflow cut-off valve through pipelines; the ink backflow cut-off valve on the ink sac is connected to a positive pressure device through a pipeline; the ink backflow cut-off valve on the circulation ink sac is connected to a vacuum device through a pipeline.

[0008] As a further scheme of the utility model: the ink backflow cut-off valve comprises a valve body, a precision stainless steel ball is arranged inside the valve body, a valve core is arranged at the bottom of the valve body, and a first sealing gasket and a second sealing gasket are arranged on the valve core.

[0009] As a further scheme of the utility model: one end of the ink sac is connected to an ink supply pump through a pipeline, and the other end of the ink supply pump is connected to a main ink bottle through a pipeline.

[0010] As a further solution of the present utility model: a cartridge float switch and a circulating cartridge float switch are respectively arranged in the cartridge and the circulating cartridge.

[0011] The beneficial effects of the present utility model are as follows:

[0012] 1. Through the setting of the ink reflux cut-off valve, the present utility model solves the abnormal problems, device failure and damage caused by the ink backflow into the positive and negative pressure device in the case of out-of-control positive and negative pressure control of the circulating ink path in the inkjet technology.

[0013] 3. Miniaturized, easy to integrate, does not occupy the equipment space, and does not involve the electric control part. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present utility model will be further described below with reference to the accompanying drawings.

[0015] Figure 1 is the overall structural schematic diagram of the present utility model;

[0016] Figure 2 is the overall structural schematic diagram of the ink reflux cut-off valve of the present utility model;

[0017] Figure 3 is the internal structural schematic diagram of the ink reflux cut-off valve of the present utility model;

[0018] Figure 4 is the component structural schematic diagram of the ink reflux cut-off valve of the present utility model.

[0019] In the figure: 01, main ink bottle; 02, ink supply pump; 03, cartridge; 04, cartridge float switch; 05, circulating cartridge; 06, circulating cartridge float switch; 07, circulating pump; 08, inkjet print head; 09, positive pressure device; 010, vacuum device; 011, ink reflux cut-off valve; 011-1, valve body; 011-2, valve core; 011-3, precision stainless steel ball; 011-4, first sealing washer; 011-5, second sealing washer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0021] Embodiment 1

[0022] Please refer to Figures 1 to 3As shown in the figure, the utility model relates to a cut-off valve for preventing ink backflow in a printing inkjet circulation ink path control, which comprises an ink sac 03. One end of the ink sac 03 is connected to a supply ink pump 02 through a pipeline, the other end of the supply ink pump 02 is connected to a main ink bottle 01 through a pipeline, the ink sac 03 is connected to an inkjet print head 08 through a pipeline, the inkjet print head 08 is connected to a circulation ink sac 05 through a pipeline, and the circulation ink sac 05 is connected to the ink sac 03 through a circulation pump 07 and a pipeline; A circulation loop is formed among the ink sac 03, the inkjet print head 08 and the circulation ink sac 05.

[0023] Both the ink sac 03 and the circulation ink sac 05 are connected to an ink backflow cut-off valve 011 through pipelines; The ink backflow cut-off valve 011 on the ink sac 03 is connected to a positive pressure device 09 through a pipeline; The ink backflow cut-off valve 011 on the circulation ink sac 05 is connected to a vacuum device 010 through a pipeline.

[0024] An ink sac float switch 04 and a circulation ink sac float switch 06 are respectively arranged in the ink sac 03 and the circulation ink sac 05.

[0025] Specifically: For the supply control, the supply ink pump 02 pumps the ink from the main ink bottle 01 into the ink sac 03. When the liquid level triggers the ink sac float switch 04, the supply ink pump 02 stops supplying ink. For the positive and negative pressure liquid level circulation, the positive pressure device 09 generates a slight positive pressure to squeeze the ink from the ink sac 03 through the inner cavity of the inkjet print head 08 and flow to the circulation ink sac 05. When the ink triggers the circulation ink sac float switch 06, the circulation pump 07 pumps the ink into the ink sac 03 to form an ink circulation. By adjusting the pressures at both ends of the positive pressure device 09 and the vacuum device 010, the ink levels at the front and rear ends of the inkjet print head 08 are kept balanced and stable. However, in the case of accidental power failure of the positive pressure device or out-of-control of the positive and negative pressures and imbalance of the pressures at both ends, the ink will backflow and overflow from the positive pressure device 09 and the vacuum device 010. Therefore, an ink backflow cut-off valve 011 is installed on the positive pressure device 09 (model MV-SD100) and the vacuum device 010 (model ZK-10), which can not only solve the problem of ink backflow and overflow when the control is out of control, but also does not affect the normal operation of the positive and negative pressures.

[0026] Embodiment 2

[0027] On the basis of Embodiment 1, please refer to Figure 4 As shown in the figure, the ink backflow cut-off valve 011 comprises a valve body 011-1, a precision stainless steel ball 011-3 is arranged inside the valve body 011-1, a valve core 011-2 is arranged at the bottom of the valve body 011-1, and a sealing washer one 011-4 and a sealing washer two 001-5 are arranged on the valve core 011-2 for sealing.

[0028] Prevent ink backflow and overflow by the up and down displacement of the precision stainless steel ball 011-3 inside the valve body 011-1. When the precision stainless steel ball 011-3 is at position a under the influence of its own weight, it does not affect the normal operation of positive and negative pressure. When ink backflows, under the influence of the thrust of liquid flow, the precision stainless steel ball 011-3 will move to position b due to the liquid flow rate. At this time, the spherical arc surface meshes with the upper channel, cutting off the ink path, so that the ink will not backflow into the positive vacuum device, forming a protection.

[0029] One embodiment of the present invention has been described in detail above, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. Any equal changes and improvements made according to the scope of application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. An inkjet printing circulation ink path control check valve for preventing ink backflow, characterized in that, It includes an ink sac (03), the ink sac (03) is connected to an inkjet print head (08) through a pipeline, the inkjet print head (08) is connected to a circulating ink sac (05) through a pipeline, and the circulating ink sac (05) and the ink sac (03) are connected through a circulating pump (07) and a pipeline; a circulation loop is formed among the ink sac (03), the inkjet print head (08) and the circulating ink sac (05). Both the ink sac (03) and the circulating ink sac (05) are connected to an ink return cut-off valve (011) through pipelines; the ink return cut-off valve (011) on the ink sac (03) is connected to a positive pressure device (09) through a pipeline; the ink return cut-off valve (011) on the circulating ink sac (05) is connected to a vacuum device (010) through a pipeline.

2. The cut-off valve for preventing ink backflow in a printing inkjet circulation ink path control according to claim 1, characterized in that, The ink return cut-off valve (011) includes a valve body (011-1), a precision stainless steel ball (011-3) is arranged inside the valve body (011-1), a valve core (011-2) is arranged at the bottom of the valve body (011-1), and a first sealing washer (011-4) and a second sealing washer (011-5) are arranged on the valve core (011-2).

3. A cut-off valve for preventing ink backflow in a printing inkjet circulation ink path control according to claim 1, characterized in that One end of the ink sac (03) is connected to a ink supply pump (02) through a pipeline, and the other end of the ink supply pump (02) is connected to a main ink bottle (01) through a pipeline.

4. A cut-off valve for preventing ink backflow in a printing inkjet circulation ink path control according to claim 1, characterized in that, An ink sac float switch (04) and a circulating ink sac float switch (06) are respectively arranged inside the ink sac (03) and the circulating ink sac (05).

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