Automatic cleaning device for UV printer nozzle and printer

Abstract

The invention relates to the technical field of UV printer nozzles, in particular to an automatic cleaning device for a UV printer nozzle and a printer. A pneumatic assembly drives a second piston to move left and right, and the second piston synchronously drives a first piston through a fixing rod, so that cleaning liquid flows into a cavity between the first piston and the second piston from a storage cylinder; the gas enters the leftmost chamber of the syringe through a second one-way valve in the first piston; the piston reciprocates to continuously press cleaning liquid into the spray head for washing, and dirty liquid after washing is directly discharged into a waste liquid cylinder in threaded connection through a channel formed by an arc-shaped plate when the piston retracts; the whole device is installed on the UV printer body through the protection block, automatic cleaning can be completed without disassembling the spray head, the maintenance cost is reduced, the continuous operation capacity is improved, tools are not needed in the whole process, the spray head or any part of the whole device does not need to be disassembled, and the maintenance downtime is remarkably shortened. And continuous and efficient operation of the UV printer is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of UV printer nozzle, in particular to a UV printer nozzle automatic cleaning device and printer. BACKGROUND

[0002] The UV printer is a high-tech plateless full-color digital printer, which can perform color photo-level printing on the surfaces of T-shirts, sliding doors, cabinet doors, sliding doors, glass, boards, various signs, crystal, PVC, acrylic, metal, plastic, stone, leather, etc. without being limited by materials. It does not need to make a plate and can complete printing at one time. It has beautiful and rich colors, wear resistance, ultraviolet resistance, simple and convenient operation, fast printing image speed, and fully meets the industrial printing standards.

[0003] A UV printer nozzle automatic cleaning device and printer are disclosed in CN114103465A. The UV printer nozzle automatic cleaning device includes a base, a pay-off roll, a take-up roll, and a cleaning roll. The cleaning cloth on the pay-off roll is wrapped around the take-up roll after passing through the cleaning roll. A workbench is horizontally arranged on the base and has a through hole that communicates with the inside of the base. The cleaning roll is vertically and slidingly connected to the base, and the outer edge of the cleaning roll is used to pass through the through hole and is located outside the workbench. The present application has the following advantages and effects: by setting a high-automation cleaning device, the cleaning operation of the printer nozzle is automatically realized, the manual maintenance of the operator is effectively reduced, the safety of the personnel is improved, and the equipment is truly developed in the aspects of humanization, automation, and intelligence.

[0004] Or a urinary surgery protection device is disclosed in CN214074101U. A plate UV digital printer nozzle automatic cleaning device is related to printing technology and includes a suction nozzle assembly, a scraping piece assembly, and a suction box. The suction nozzle assembly includes a suction nozzle, and the inlet of the suction nozzle is close to the lower end of the nozzle. The outlet of the suction nozzle is connected to the suction box. The scraping piece assembly includes a scraping piece, and the scraping piece is in contact with the lower end of the nozzle. In the cleaning direction, the suction nozzle assembly is located in front of the scraping piece assembly. The suction nozzle assembly is located in front, and the large droplets of ink are first sucked away. The remaining ink is less, and the scraping piece assembly scrapes the remaining ink that is not sucked away by the suction nozzle assembly. The two components cooperate with each other to complete the cleaning of the nozzle at one time and improve the cleaning efficiency. After automatic cleaning, the hollow scraping piece is cleaned with cleaning liquid, so that the ink does not remain and accumulate on the scraping piece.

[0005] Two kinds of UV printer nozzle automatic cleaning device rely on cleaning cloth wiping or "suction nozzle + scraper" combination, only can carry out scraping or adsorption operation on the surface of the nozzle, the cleaning effect is limited to the ink and droplets outside the nozzle panel, and there is no effective mechanism to remove the ink which has entered the nozzle and gradually solidified and caked in the micropore or ink path. If the caked ink in the nozzle cannot be effectively cleaned, it will directly cause partial or complete blockage of the nozzle, resulting in printing defects such as oblique spraying, ink breakage, color difference, and stripes, which requires frequent manual disassembly and cleaning, greatly increasing maintenance time and labor cost; the residual caked ink stains are further hardened under long-term high temperature and UV light, which can easily damage the piezoelectric ceramic and nozzle plating layer, and shorten the service life of the nozzle; at the same time, the pressure recoil caused by the blocked hole can easily damage the ink supply pump and ink path sealing element, causing ink leakage and ink pollution, even causing serious faults such as circuit short circuit and mechanical corrosion, and finally reducing the equipment utilization rate and product yield, and restricting the application of UV printer in industrial continuous production. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application provides a UV printer nozzle automatic cleaning device and printer, thereby solving the technical problems mentioned in the background art.

[0007] To achieve the above purpose, the present application is realized by the following technical scheme:

[0008] A UV printer nozzle automatic cleaning device and printer, comprising a nozzle for ejecting ink, ink inlet pipes are arranged on both sides of the nozzle, a first one-way valve is arranged in each of the two ink inlet pipes, a spring rod is arranged at the bottom of the first one-way valve in the left ink inlet pipe, and an L-shaped pipe is arranged at the bottom of the spring rod.

[0009] In a possible implementation manner, the hollow part of the L-shaped pipe is L-shaped, the spring rod is located at the edge of the bottom of the first one-way valve, and the size of the L-shaped pipe is the same as the size of the inner wall of the ink inlet pipe.

[0010] In a possible implementation manner, a storage cylinder is arranged on the left side of the nozzle, a threaded injection cylinder is arranged at the bottom of the storage cylinder, a first piston is arranged in the injection cylinder, and a second piston is further arranged in the injection cylinder.

[0011] In a possible implementation manner, a fixed rod is fixedly connected between the first piston and the second piston, and an arc-shaped plate is arranged between the first piston and the second piston.

[0012] In a possible implementation, the arc-shaped plate is located at the edge of the bottom of the first and second pistons, the fixed rod is located at the center of the first and second pistons, the bottom of the injection cylinder is provided with a waste liquid cylinder through a thread, the waste liquid cylinder is located at the right side of the storage cylinder, and the rightmost end of the injection cylinder is provided with a pneumatic assembly.

[0013] In a possible implementation, the storage cylinder and the waste liquid cylinder are connected with the injection cylinder through threads, and the pneumatic assembly is fixedly connected with the protection block.

[0014] In a possible implementation, the second one-way valve is fixedly installed in the first piston, and the arc-shaped plate is always attached to the inner wall of the injection cylinder.

[0015] In a possible implementation, the leftmost end of the injection cylinder is threadedly installed with the nozzle.

[0016] In a possible implementation, a UV printer includes a nozzle bottom and further includes a UV printer body for printing, and the rightmost end of the UV printer body is provided with a slot.

[0017] In a possible implementation, the sponge block is installed at the left side of the slot, and the sponge block is clamped in the interior of the UV printer body.

[0018] Compared with the prior art, the beneficial effects are as follows:

[0019] 1. In the scheme, the second piston is driven to move left and right by the pneumatic assembly, the second piston synchronously drives the first piston through the fixed rod, the cleaning liquid flows from the storage cylinder into the chamber between the first and second pistons, and then enters the leftmost chamber of the injection cylinder through the second one-way valve in the first piston; the reciprocating action of the piston continuously pressurizes the cleaning liquid into the interior of the nozzle for flushing, the dirty liquid after flushing is directly discharged into the waste liquid cylinder connected through a thread through the channel opened by the arc-shaped plate when the piston retracts; the leftmost end of the injection cylinder is threadedly fixed with the nozzle, and the whole is installed in the UV printer body through the protection block, so that automatic cleaning can be completed without disassembling the nozzle, maintenance cost is reduced, and continuous operation ability is improved.

[0020] 2. In this scheme, the pneumatic assembly is powered by compressed air to push the second piston to do high-frequency reciprocating linear motion in the syringe; the piston is rigidly connected with the first piston through the fixed rod, so that the two pistons move synchronously to form two chambers with alternating volume. When the piston moves to the right, the right chamber expands, and the cleaning liquid in the storage cylinder pushes the second one-way valve in the first piston under the action of atmospheric pressure and gravity, and quickly fills the intermediate chamber between the first and second pistons; when the piston moves to the left, the intermediate chamber shrinks, and the liquid can only flow into the leftmost chamber through the one-way channel of the second one-way valve at high speed, and then be pressed into the nozzle connected with the syringe. In the process of continuous reciprocation, the cleaning liquid in pulse form deeply washes the ink path and nozzle of the nozzle, and removes and removes the residual ink stains. At the same time, the arc plate always adheres to the inner wall of the syringe and moves periodically above the waste liquid cylinder inlet with the piston: at the end of the left stroke of the piston, the arc plate leaves the waste liquid cylinder inlet, and the waste liquid is instantaneously discharged; at the beginning of the right return stroke of the piston, the arc plate blocks the inlet again to avoid the secondary backflow of the cleaning liquid. The waste liquid cylinder is screwed with the bottom of the syringe, and the capacity can be selected according to the working condition. When it is full, it only needs to be unscrewed counterclockwise to be carried out and poured, and then it is screwed clockwise to complete the reset. The whole process does not need tools, nor needs to disassemble the nozzle or any parts of the machine, which significantly shortens the maintenance downtime and ensures the continuous and efficient operation of the UV printer;

[0021] 3. In this scheme, the cleaning device adopts a three-section threaded quick-release structure: the left end of the syringe is screwed with the corresponding interface of the nozzle to ensure airtightness; the right end is fastened with the threaded hole of the UV printer body through the installation plate of the protection block, which provides stable support and facilitates overall assembly and disassembly. When it is necessary to supplement the cleaning liquid or empty the waste liquid, it only needs to be rotated by one hand to complete the disassembly or reassembly within seconds, which is more than three times more efficient than the traditional clamp structure. The pneumatic assembly and the protection block are integrally injection molded, and the internal air duct is directly connected with the external air source quick plug connector without additional pipeline adapter, which further reduces the risk of leakage. After the nozzle completes the printing task, the UV printer body automatically moves it to the right end, and when it passes through the clamped sponge block, the sponge block pre-wipes the bottom surface of the nozzle to remove the floating ink; continue to move to the slot, the slot is connected with the bottom shell of the printer, and the waste liquid generated by the flushing nozzle flows out of the machine under the action of gravity through the slot, avoiding any liquid remaining on the surface of the electrical or moving parts inside the machine, eliminating hidden dangers such as short circuit and corrosion. The sponge block is embedded in the UV printer body in the form of elastic buckle and can be replaced by hand after wear, and the whole process also does not need tools, which greatly improves the maintenance convenience and the overall hygiene level of the equipment, significantly prolonging the service life of the core components of the UV printer. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above description is only a summary of the technical scheme of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, the following will describe the preferred embodiments of the present application in detail with reference to the accompanying drawings.

[0023] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the present application;

[0024] Figure 2 Fig. 2 is a schematic diagram of the ink inlet tube structure of the present application;

[0025] Figure 3 Fig. 3 is a schematic diagram of the pneumatic assembly structure of the present application;

[0026] Figure 4 Fig. 4 is a schematic diagram of the nozzle structure of the present application;

[0027] Figure 5 Fig. 5 is a schematic diagram of the spring rod structure of the present application;

[0028] Figure 6 Fig. 6 is a schematic diagram of the storage cylinder structure of the present application;

[0029] Figure 7 Fig. 7 is a schematic diagram of the protection block structure of the present application;

[0030] Figure 8 Fig. 8 is a schematic diagram of the injection cylinder structure of the present application;

[0031] Figure 9 Fig. 9 is a schematic diagram of the arc-shaped plate structure of the present application;

[0032] Figure 10 Fig. 10 is a schematic diagram of the UV printer body structure of the present application;

[0033] Figure 11 Fig. 11 is a schematic diagram of the notch structure of the present application;

[0034] Figure 12 Fig. 12 is a schematic diagram of the sponge block structure of the present application.

[0035] Legend: 11, nozzle; 12, ink inlet tube; 13, first one-way valve; 14, L-shaped tube; 15, storage cylinder; 16, injection cylinder; 17, first piston; 18, second piston; 19, fixed rod; 21, arc-shaped plate; 22, waste liquid cylinder; 23, pneumatic assembly; 24, UV printer body; 25, sponge block; 26, spring rod; 27, protection block; 28, notch. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present application will be described in detail by referring to the attached drawings, however the present application can be realized in various different forms, therefore the present application is not limited to the embodiments described below, in addition, in order to more clearly describe the present application, components not connected with the application will be omitted from the drawings;

[0037] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0038] In addition, the terms "first", "second", "third" and the like are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" and "third" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0039] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection, or communication; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. In the description of the present application, the description of the terms "one scheme", "some schemes", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present application. In the present specification, the illustrative description of the above terms is not necessarily directed to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more schemes or examples in a suitable manner.

[0041] The technical scheme in the embodiments of the present application is to solve the problems in the above background art, and the general idea is as follows:

[0042] Embodiment one:

[0043] Reference should be made to Figures 1 to 9 As shown in the embodiment, the specific structure of the UV printer nozzle automatic cleaning device and the printer is introduced, which comprises a nozzle 11 for spraying ink, ink inlet pipes 12 are arranged on both sides of the nozzle 11, first one-way valves 13 are arranged in the two ink inlet pipes 12, which prevent the subsequent cleaning liquid from flowing back to the inside of the ink inlet pipe 12, so that the internal ink is not contaminated, wherein the bottom of the first one-way valve 13 in the left ink inlet pipe 12 is provided with a spring rod 26, the bottom of the spring rod 26 is provided with an L-shaped pipe 14, and when the ink is sprayed into the nozzle 11, the ink will be sprayed into the inside of the L-shaped pipe, at this time the L-shaped pipe will move from top to bottom under the pressure, the L-shaped pipe will stretch the spring rod 26, at this time the L-shaped pipe will stretch out of the inside of the ink inlet pipe 12, and the ink will flow into the inside of the nozzle 11, the through hole on the side of the nozzle 11 will be blocked by the L-shaped pipe to prevent the ink from entering the inside of the cleaning device, after use, a large amount of ink will be left in the inside of the nozzle 11, which needs to be cleaned, if not cleaned, it will be condensed after a long time to block the nozzle 11.

[0044] The hollow part in the L-shaped pipe is L-shaped, which realizes one-side ink outlet and prevents the ink from entering the inside of the cleaning device, when the spring rod 26 is not stretched, the L-shaped pipe is located in the inside of the ink inlet pipe 12, and it will stretch out of the inside of the ink inlet pipe 12 only when it is under the pressure of the ink, and the spring rod 26 is located at the edge of the bottom of the first one-way valve 13, the setting of the spring rod 26 will not hinder the ink from entering the inside of the nozzle 11, and the size of the L-shaped pipe is the same as the size of the inner wall of the ink inlet pipe 12, so that the situation that the ink accidentally flows out of the inside of the L-shaped pipe will not occur.

[0045] When it needs to be cleaned, the cleaning agent is added into the storage cylinder 15, a syringe 16 is arranged at the bottom of the storage cylinder 15 in a threaded manner, the inside of the syringe 16 is provided with a first piston 17, the initial position of the first piston 17 is at the bottom of the storage cylinder 15, at this time, the water in the inside of the storage cylinder 15 cannot enter the inside of the syringe 16, in addition, the inside of the syringe 16 is also provided with a second piston 18, the first piston 17 and the second piston 18 are connected together through a fixed rod 19, an arc-shaped plate 21 is arranged between the first piston 17 and the second piston 18, the arc-shaped plate 21 is located at the edge of the bottom of the first piston 17 and the second piston 18, the fixed rod 19 is located at the position of the center of the first piston 17 and the second piston 18, a waste liquid cylinder 22 is arranged at the bottom of the syringe 16 in a threaded manner, the position of the waste liquid cylinder 22 is located at the right side of the storage cylinder 15, in use, the arc-shaped plate 21 is always above the waste liquid cylinder 22, the arc-shaped plate 21 blocks the waste liquid cylinder 22, the rightmost end of the syringe 16 is provided with a pneumatic assembly 23, the pneumatic assembly 23 will drive the second piston 18 to move, when the cleaning liquid flows from the inside of the storage cylinder 15 to the inside of the syringe 16, the cleaning liquid will flow between the first piston 17 and the second piston 18, and then flow to the leftmost chamber of the syringe 16 through the second one-way valve installed on the first piston 17, at this time, the pneumatic assembly 23 drives the second piston 18 to move left and right, at this time, the second piston 18 will drive the arc-shaped plate 21 and the connecting rod to move left and right, the arc-shaped plate 21 and the connecting rod will drive the first piston 17 to move left and right, so that the cleaning liquid in the leftmost chamber continuously enters and is extracted from the inside of the spray head 11, so as to clean the spray head 11, and then the pneumatic assembly 23 drives the components in the inside of the syringe 16 to contract greatly, so that the first piston 17 moves to the bottom of the storage cylinder 15, and the first piston 17 blocks the storage cylinder 15, at this time, the waste liquid cylinder 22 is in a non-blocking state, and the cleaning liquid containing a large amount of dirt in the inside will flow into the inside of the waste liquid cylinder 22, at this time, the pneumatic assembly 23 is made to repeat the previous action, drives the components in the inside of the syringe 16 to move left and right, the cleaning liquid continuously enters between the first piston 17 and the second piston 18, and then enters the inside of the leftmost chamber through the second one-way valve, because the cleaning liquid in the inside of the one-way valve cannot return to between the first piston 17 and the second piston 18, so the first piston 17 will press the cleaning liquid into the inside of the spray head 11, and then is sprayed from the inside of the spray head 11 to dredge, the protection blocks 27 are arranged on the side walls of the syringe 16, the storage cylinder 15 and the waste liquid cylinder 22, so as to prevent the syringe 16, the storage cylinder 15 and the waste liquid cylinder 22 from being damaged.

[0046] The injection cylinder 16 is connected with the storage cylinder 15 and the waste liquid cylinder 22 at the protruding connecting pipe, the side wall of the connecting pipe is screwed, so the storage cylinder 15 and the waste liquid cylinder 22 are directly connected with the injection cylinder 16 through the screw, in addition, the pneumatic assembly 23 is also fixedly connected with the package block, the maximum stroke of the first piston 17 is from the storage cylinder 15 to the rightmost end of the injection cylinder 16, the movement stroke of the second piston 18 is followed by the movement stroke of the first piston 17.

[0047] The second one-way valve is fixedly installed in the first piston 17, the second one-way valve can only transmit the cleaning liquid from the end close to the second piston 18 to the rightmost end of the injection cylinder 16, the arc-shaped plate 21 is always attached to the inner wall of the injection cylinder 16, effectively blocking the cleaning liquid.

[0048] The cleaning assembly is connected with the UV printer body 24 through the mounting plate installed on the side wall of the protection block 27 and the bolt installed in the mounting plate through the screw, so the cleaning device and the UV printer body 24 are connected together, the nozzle 11 can be cleaned without disassembling the device, but when the waste liquid in the waste liquid cylinder 22 is full, the cleaning device needs to be disassembled from the UV printer body 24, the waste liquid cylinder 22 is screwed out from the inside of the cleaning device, the waste liquid in the inside is poured out and then reinstalled, the leftmost end of the injection cylinder 16 is screwed together with the nozzle 11, which is convenient for disassembling and installing the cleaning device.

[0049] Embodiment two:

[0050] Please refer to Figures 9 to 12 The bottom of the nozzle 11 also includes the UV printer body 24 for printing, the UV printer body 24 is provided with a threaded hole in the inside, the cooperation between the bolt and the threaded hole stably installs the cleaning device in the inside of the UV printer body 24, when the outside of the nozzle 11 needs to be cleaned, the spraying assembly of the UV printer body 24 is moved to the rightmost end of the printer, when the movement passes through the installed sponge block 25 above the UV printer body 24, the sponge block 25 will clean the bottom of the nozzle 11, continuously moving to the rightmost end of the UV printer, the notch 28 is arranged at the rightmost end of the UV printer, when the nozzle 11 is cleaned, the cleaning liquid sprayed from the nozzle 11 can flow out of the inside of the UV printer body 24 from the notch 28, after cleaning, when passing through above the sponge block 25, the nozzle 11 will be wiped, the water stains of the nozzle 11 are washed clean, the cleaning device is directly connected with the nozzle 11, so there will be no cleaning liquid leakage under the condition that the cleaning device is damaged.

[0051] The sponge block 25 is installed at the left side of the slot 28, and when reaching the slot 28, it must pass through the sponge block 25, which is clamped in the interior of the UV printer body 24. When the sponge block 25 needs to be replaced, it is directly buckled out of the UV printer body 24, so that the quick replacement can be completed. Finally, it should be pointed out that: obviously, the above embodiments are only examples for clearly illustrating the present application, and are not limitations on the embodiments. For ordinary skilled persons in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to exhaust all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A UV printer head (11) automatic cleaning device, comprising a head (11) for ink ejection, ink inlet pipes (12) are arranged on both sides of the head (11), characterized in that, Two said ink inlet tubes (12) are internally provided with first one-way valves (13), the bottom of the first one-way valve (13) in the left ink inlet tube (12) is provided with a spring rod (26), and the bottom of the spring rod (26) is provided with an L-shaped through pipe (14).

2. An automatic cleaning device for a UV printer head (11) according to claim 1, characterized in that, The L-shaped through pipe is internally provided with an L-shaped hollow part, the spring rod 26 is located at the edge of the bottom of the first one-way valve (13), and the size of the L-shaped through pipe is the same as that of the inner wall of the ink inlet tube (12).

3. A device for automatic cleaning of a UV printer head (11) according to claim 1, characterized in that, The left side of the nozzle (11) is provided with a storage cylinder (15), the bottom of the storage cylinder (15) is threadedly provided with an injection cylinder (16), the inside of the injection cylinder (16) is provided with a first piston (17), and the inside of the injection cylinder (16) is further provided with a second piston (18).

4. An automatic cleaning device for a UV printer head (11) according to claim 1, characterized in that, The first piston (17) and the second piston (18) are fixedly connected with a fixed rod (19), and the first piston (17) and the second piston (18) are provided with an arc plate (21).

5. An automatic cleaning device for a UV printer head (11) according to claim 4, characterized in that, The arc plate (21) is located at the edge of the bottom of the first piston (17) and the second piston (18), the fixed rod (19) is located at the center of the first piston (17) and the second piston (18), the bottom of the injection cylinder (16) is threadedly provided with a waste liquid cylinder (22), the waste liquid cylinder (22) is located at the right side of the storage cylinder (15), and the rightmost end of the injection cylinder (16) is provided with a pneumatic assembly (23).

6. An automatic cleaning device for a UV printer head (11) according to claim 5, characterized in that, The storage cylinder (15) and the waste liquid cylinder (22) are connected with the injection cylinder (16) through threads, and the pneumatic assembly (23) is fixedly connected with the protection block (27).

7. An automatic cleaning device for a UV printer head (11) according to claim 6, characterized in that, The second one-way valve is fixedly installed in the first piston (17), and the arc plate (21) is always attached to the inner wall of the injection cylinder (16).

8. An automatic cleaning device for a UV printer head (11) according to claim 7, characterized in that, The leftmost side of the injection cylinder (16) is threadedly installed with the nozzle (11).

9. A UV printer equipped with the automatic cleaning device for the UV printer head (11) according to any one of claims 1 to 8, characterized in that, The bottom of the nozzle (11) further comprises a UV printer body (24) for printing, and the rightmost end of the UV printer body (24) is provided with a slot (28).

10. A UV printer as claimed in claim 9, characterized in that The sponge block (25) is installed at the left side of the slot (28), and the sponge block (25) is clamped in the inside of the UV printer body (24).

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