阅读说明：本技术 一种无线通信产品屏蔽盖喷墨装置及方法 (Ink-jet device and method for shielding cover of wireless communication product ) 是由 方福贵 郭海亮 于 2019-11-27 设计创作，主要内容包括：本发明公开了一种无线通信产品屏蔽盖喷墨装置及方法,包括机架以及设置在机架上的X轴运动模组、Y轴运动模组、喷墨装置、屏蔽盖供料装置、侧夹定位装置、吸附顶升装置和检测装置,所述X轴运动模组架设在所述Y轴运动模组上,且所述Y轴运动模组带动所述X轴运动模组沿所述机架的纵向移动；所述喷墨装置设置于X轴运动模组上。本发明通过设置的压电喷头对屏蔽盖的表面进行喷印,并在喷印后通过设置的UV固定灯对屏蔽盖表面上的印墨进行固化,与传统工艺相比,比现有贴标工艺成本低廉,导热性更好,比现有喷码工艺相比提高了喷墨的附着力,并可实现多色喷印,而且也可避免激光雕刻工艺导致的屏蔽盖热变形损坏,以及容易氧化不易读取等弊端。(The invention discloses an ink-jet device and method for a shielding cover of a wireless communication product, and the ink-jet device comprises a rack, and an X-axis movement module, a Y-axis movement module, an ink-jet device, a shielding cover feeding device, a side clamp positioning device, an adsorption jacking device and a detection device which are arranged on the rack, wherein the X-axis movement module is erected on the Y-axis movement module, and the Y-axis movement module drives the X-axis movement module to move along the longitudinal direction of the rack; the ink jet device is arranged on the X-axis movement module. According to the invention, the surface of the shielding cover is subjected to spray printing through the arranged piezoelectric nozzle, and the printing ink on the surface of the shielding cover is solidified through the arranged UV fixing lamp after the spray printing, compared with the traditional process, the process has the advantages of lower cost and better thermal conductivity compared with the existing labeling process, improves the adhesive force of ink jet compared with the existing code spraying process, can realize multicolor spray printing, and can also avoid the defects of thermal deformation damage of the shielding cover caused by a laser engraving process, easiness in oxidation, difficulty in reading and the like.)

1. The utility model provides a wireless communication product shielding cover ink jet equipment, includes frame (1) and X axle motion module (2), Y axle motion module (3), ink jet equipment (4), shielding cover feedway (5), side clamp positioner (6), adsorbs jacking device (7) and detection device (8) of setting in frame (1), its characterized in that: the X-axis motion module (2) is erected on the Y-axis motion module (3), and the Y-axis motion module (3) drives the X-axis motion module (2) to move along the longitudinal direction of the rack (1); the ink jet device (4) is arranged on the X-axis movement module (2), the X-axis movement module (2) drives the ink jet device (4) to move transversely, and a piezoelectric nozzle (401) for jet printing and a UV curing lamp (402) for curing are arranged on the ink jet device (4); the shielding cover feeding device (5) is arranged on a moving path of the ink jet device (4) and is used for providing a shielding cover (9) for the ink jet device (4); the side clamp positioning device (6) is arranged on one side of the shielding cover feeding device (5) and used for positioning and clamping the shielding cover (9); the adsorption jacking device (7) is arranged at the bottom of the shielding cover feeding device (5) and is provided with a vacuum sucker (701) for sucking the shielding cover (9); the detection device (8) is a CCD camera and is used for detecting the position of the shielding cover (9), the jet printing position, the bar code reading and the jet printing information quality inspection which are arranged on one side of the ink jet device (4).

2. The wireless communication product shield cap ink jet assembly of claim 1, wherein: the ink jet device (4) comprises a support (403) provided with a piezoelectric nozzle (401) and a UV curing lamp (402), wherein an ink jet controller (404) and an ink box (405) are arranged on the support (403), the ink box (405) is connected with the piezoelectric nozzle (401), the piezoelectric nozzle (401) is connected with the ink jet controller (404), and the ink jet controller (404) is connected with the UV curing lamp (402).

3. The wireless communication product shield cap ink jet assembly of claim 1, wherein: the shielding cover feeding device (5) comprises a fixed rail (501), a movable rail (502) and a width adjusting mechanism (503) for driving the movable rail (502) to change the width between the movable rail (502) and the fixed rail (501); the width adjusting mechanism (503) comprises a first driving motor (5031) and a driving rod (5032) for driving the movable rail (502) to move, and the driving rod (5032) is connected with the first driving motor (5031) through a coupler; install synchronous conveying mechanism (504) on fixed track (501) and movable track (502), conveying mechanism (504) include drive wheel (5041) and follow driving wheel (5042), follow driving wheel (5042) and be connected with drive wheel (5041) through conveyer belt (5043), drive wheel (5041) are connected with second driving motor (5043).

4. The wireless communication product shield cap ink jet assembly of claim 1, wherein: the side clamp positioning device (6) comprises a side positioning clamp plate (601) arranged on the movable rail (502), a positioning stop block (602) arranged on the movable rail (502) and a first air cylinder (603) driving the positioning stop block (602) to move up and down.

5. The wireless communication product shield cap ink jet assembly of claim 1, wherein: the adsorption jacking device (7) comprises a fixed platform (702), a vacuum jig (703) arranged on the fixed platform (702), a second air cylinder (704) driving the fixed platform (702) to lift, and a guide rod (705) assisting the fixed platform (702) to lift in a balanced manner; one side of the vacuum jig (703) is provided with a vacuum suction pipe interface, and the top of the vacuum jig is provided with a vacuum sucker (701).

6. The wireless communication product shield cap ink jet assembly of claim 1, wherein: the intelligent control system is characterized by further comprising a main controller, wherein the main controller comprises a main control circuit board and a microprocessor arranged on the main control circuit board, and the microprocessor is connected with each device through the main control circuit board.

7. An ink-jet method of a wireless signal shielding cover, comprising the steps of:

step 1: the shielding cover (9) enters the jet printing area along with the track in the feeding device;

step 2: when the shielding cover (9) enters the jet printing area, the position of the shielding cover (9) is positioned by a positioning baffle (602) and a positioning clamp plate (601) in the side clamp positioning device (6);

and step 3: after the shielding cover (9) is positioned, a vacuum sucker (701) in the adsorption jacking device (7) adsorbs the bottom of the shielding cover or the PCB (9), and the shielding cover (9) is fixed;

and 4, step 4: after the shielding cover (9) is fixed, the detection device (8) detects at least two identification marks arranged on the shielding cover (9);

and 5: acquiring the position of the shielding cover (9) according to the identification;

step 6: controlling X, Y module to drive the ink-jet device (4) to move right above the shielding cover (9) to carry out jet printing solidification according to the obtained position of the shielding cover (9);

and 7: after the jet printing is solidified, detecting whether the jet printing meets the requirements through a detection device (8);

and 8: after detection, the shielding cover or PCB (9) is taken out through the track.

8. The ink-jet method of a wireless signal shielding cover according to claim 7, wherein: the identification Mark in the step 4 is a Mark point or a characteristic pattern (901) arranged on the shielding cover (9); the shielding cover (9) is a metal housing.

9. The ink-jet method of a wireless signal shielding cover according to claim 7, wherein: the step of obtaining the position of the shielding cover (9) in the step 5 comprises the following sub-steps:

step 1: calling preset shape information of the shielding cover (9);

step 2: and calculating the position of the shielding cover (9) by combining the detected Mark points or characteristic graphs according to the preset shape information of the shielding cover (9).

10. The ink-jet method of a wireless signal shielding cover according to claim 7, wherein: the taking-out in the step 8 refers to outputting from a discharge hole at one side of the track through the movement of the track.

Technical Field

The invention relates to the field of electronic equipment, in particular to an ink jet device and method for a shielding cover of a wireless communication product.

Background

A shield is a means for shielding electronic signals. The function is to shield the influence of external electromagnetic wave on the internal circuit and the outward radiation of the internally generated electromagnetic wave.

With the development of communication technology, the application of wireless rf circuit technology is becoming wider and wider, and the rf circuit in the electronic device often emits high-frequency electromagnetic waves during operation, which may interfere with the normal operation of the electronic device, resulting in temporary malfunction and even more, device damage. Nowadays, as electronic devices such as computers, mobile phones, cameras, etc. are becoming indispensable in daily life, in order to avoid such harmful electromagnetic radiation, reduce the interference of the radio frequency part to the outside world and protect itself from interference, a metal shielding cover is usually added on a Printed Circuit Board (PCB) of the electronic device. The metal shielding cover can be used not only for shielding electromagnetism, but also for adding relevant information on the shielding cover as the technology develops. The traditional ways of adding information to the shielding cover mainly include two ways, one is a way of labeling, and the other is a way of laser, however, there are certain disadvantages no matter what way is adopted, for example, 1. labeling method: related information is printed on a piece of label paper, and then the label paper is attached to the surface of the shielding cover, so that the manufacturing cost is high, and the attached label paper easily influences the heat dissipation of the shielding cover and the electronic element; 2. laser mode: related information is carved on the shielding cover by laser, the contrast of the colors of the carved characters or patterns is small, and the two-dimensional code is not easy to read; and the shielding cover can be deformed during laser engraving, which causes poor quality; in addition, the information cannot be changed after being engraved wrongly, which can cause the rejection of the shielding cover. Utility model patent with application number CN201822234943.7, a disclosed attached device for attached shielding lid and label, the device includes: the X-axis power module and the Y-axis power module are arranged on the rack; the adsorption jacking device is arranged on the X-axis power module and is provided with a sucker for sucking the shielding cover and the label; the label feeding device is arranged on a moving path of the adsorption jacking device and is used for stripping labels on the label paper from the label base paper; the shielding cover feeding device is arranged on one side of the label feeding device and is used for providing shielding covers for the adsorption jacking device; the detection device comprises a first CCD camera and a second CCD camera, a waste outlet is arranged below the shielding cover feeding device, and a shearing module is arranged at the waste outlet and used for shearing the base paper of the shielding cover. Attached device can accomplish the operation of attached shielding cover and label automatically, and degree of automation and precision are high, can improve production efficiency greatly. Utility model patent with application number CN201822234946.0 discloses a device for absorbing label and shielding lid, the device includes: the X-axis power module and the Y-axis power module are arranged on the rack; the adsorption module is arranged on the X-axis power module, and a sucker for sucking the shielding cover and the label is arranged on the adsorption module; the upper top module is arranged on the rack, and a supporting table for supporting a circuit board is arranged on the upper top module; the wire body transmission module is arranged on the rack, and a pair of stop strips for fixing the circuit board are arranged on the wire body transmission module; the detection module comprises a first CCD camera and a second CCD camera, the first CCD camera is arranged on the adsorption module, and the second CCD camera is fixed on the line body transmission module. The device can be used for adsorbing the label and the shielding cover and accurately conveying the shielding cover and the label to the designated position, so that the precision is ensured and the production efficiency is improved. The invention patent with the application number of CN201410785526.5 discloses an automatic attaching method and a device of a shielding cover, and the embodiment of the invention provides the automatic attaching method of the shielding cover, which comprises the following steps: detecting at least two identification marks on a metal cover frame, wherein the metal cover frame is a hollow device with a frame structure, the hollow part is used for placing a surface-mounted chip, and the metal cover frame is welded on a PCB (printed circuit board); acquiring the position of the metal cover frame on the PCB according to the identification mark; controlling a mechanical arm for clamping the shielding cover to move to a position right above the metal cover frame according to the acquired position of the metal cover frame; and controlling the mechanical arm to attach the shielding cover to the metal cover frame. By utilizing the automatic attaching method, the manipulator can overcome the difficulty that the position of the metal cover frame is uncertain caused by the flowing of soldering tin, the metal cover frame is accurately positioned, the shielding cover is automatically and accurately attached outside the metal cover frame, the attaching efficiency of the shielding cover is greatly improved, and the labor cost is reduced.

In view of the above, there is a need to overcome the deficiencies of the prior art.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provides an ink jet device and an ink jet method for a shielding cover of a wireless communication product.

In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:

an ink-jet device for a shielding cover of a wireless communication product comprises a rack, and an X-axis movement module, a Y-axis movement module, an ink-jet device, a shielding cover feeding device, a side clamp positioning device, an adsorption jacking device and a detection device which are arranged on the rack, wherein the X-axis movement module is erected on the Y-axis movement module, and the Y-axis movement module drives the X-axis movement module to move along the longitudinal direction of the rack; the ink jet device is arranged on the X-axis motion module, the X-axis motion module drives the ink jet device to move transversely, and a piezoelectric nozzle for spray printing and a solidified UV curing lamp are arranged on the ink jet device; the shielding cover feeding device is arranged on a moving path of the ink jet device and is used for providing shielding covers for the ink jet device; the side clamp positioning device is arranged on one side of the shielding cover feeding device and used for positioning and clamping the shielding cover; the adsorption jacking device is arranged at the bottom of the shielding cover feeding device and is provided with a vacuum chuck for absorbing the shielding cover; the detection device is a CCD camera and is used for detecting the position of the shielding cover, the jet printing position, the bar code reading and the jet printing information quality inspection which are arranged on one side of the ink jet device.

Preferably, the ink jet device comprises a bracket for mounting the piezoelectric nozzle and the UV curing lamp, the bracket is provided with an ink jet controller and an ink box, the ink box is connected with the piezoelectric nozzle, the piezoelectric nozzle is connected with the ink jet controller, and the ink jet controller is connected with the UV curing lamp.

Preferably, the shielding cover feeding device comprises a fixed rail, a movable rail and a width adjusting mechanism for driving the movable rail to change the width between the movable rail and the fixed rail; the width adjusting mechanism comprises a first driving motor and a driving rod for driving the movable track to move, and the driving rod is connected with the first driving motor through a coupler. The synchronous conveying mechanism is arranged on the fixed rail and the movable rail and comprises a driving wheel and a driven wheel, the driven wheel is connected with the driving wheel through a conveying belt, and the driving wheel is connected with a second driving motor.

Preferably, the side clamp positioning device comprises a side positioning clamp plate arranged on the movable rail, a positioning stop block arranged on the movable rail and a first air cylinder driving the positioning stop block to move up and down.

Preferably, the adsorption jacking device comprises a fixed platform, a vacuum jig arranged on the fixed platform, a second cylinder for driving the fixed platform to lift, and a guide rod for assisting the fixed platform to lift in a balanced manner; one side of the vacuum jig is provided with a vacuum suction pipe interface, and the top of the vacuum jig is provided with a vacuum sucker.

Preferably, the electronic device further comprises a main controller, wherein the main controller comprises a main control circuit board and a microprocessor arranged on the main control circuit board, and the microprocessor is electrically connected with each electronic element through the main control circuit board.

An ink-jet method of a wireless signal shielding cover, comprising the steps of:

step 1: the shielding cover enters the jet printing area along with a track in the feeding device;

step 2: when the shielding cover enters the jet printing area, the position of the shielding cover is positioned by a positioning baffle and a positioning clamping plate in the side clamp positioning device;

and step 3: after the shielding cover is positioned, a vacuum chuck in the adsorption jacking device adsorbs the bottom of the shielding cover to fix the shielding cover;

and 4, step 4: after the shielding cover is fixed, detecting at least two identification marks arranged on the shielding cover by a detection device;

and 5: acquiring the position of the shielding cover according to the identification;

step 6: controlling X, Y module to drive the ink jet device to move right above the shielding cover according to the obtained position of the shielding cover to perform jet printing and curing;

and 7: after the jet printing is solidified, detecting whether the jet printing meets the requirements through a detection device;

and 8: and after detection, the shielding cover is taken out through the rail.

Preferably, the identification Mark in the step 4 is a Mark point or a characteristic pattern arranged on the shielding cover; the shielding cover is a metal housing.

Preferably, the step of obtaining the position of the shielding cover in the step 5 includes the following sub-steps:

step 1: calling preset shape information of the shielding cover;

step 2: and calculating the position of the shielding cover according to the preset shape information of the shielding cover and the detected Mark points or characteristic graphs.

Preferably, the taking out in the step 8 is carried out from the discharge port on the rail side by the movement of the rail.

The invention has the beneficial effects that: according to the invention, the surface of the shielding cover is subjected to spray printing through the arranged piezoelectric nozzle, and the printing ink on the surface of the shielding cover is solidified through the arranged UV fixing lamp after the spray printing, compared with the traditional process, the process has the advantages of lower cost and better thermal conductivity compared with the existing labeling process, improves the adhesive force of ink jet compared with the existing code spraying process, can realize multicolor spray printing, and can also avoid the defects of thermal deformation of the shielding cover caused by a laser engraving process, easiness in oxidation, difficulty in reading and the like; for example, the color contrast of the carved two-dimensional code is small and is difficult to read; the information engraving error cannot be changed, so that the product is scrapped and the stress deformation of the shielding cover is caused during engraving.

The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic view of an ink jet device according to the present invention;

FIG. 2 is a first structural view of an X, Y motion module according to the present invention;

FIG. 3 is a second structural diagram of an X, Y motion module according to the present invention;

FIG. 4 is a schematic view of an ink jet device according to the present invention;

FIG. 5 is a schematic view of a feeding device for shielding covers according to the present invention;

FIG. 6 is a schematic view of a side clamp positioning device according to the present invention;

FIG. 7 is a schematic structural diagram of an adsorption jacking device according to the present invention;

fig. 8 is a schematic view of a shield cover according to the present invention.

The reference numbers in the figures illustrate: the device comprises a rack 1, an X-axis motion module 2, a Y-axis motion module 3, an ink jet device 4, a shielding cover feeding device 5, a side clamp positioning device 6, an adsorption jacking device 7, a detection device 8, a shielding cover 9, a piezoelectric nozzle 401, a UV curing lamp 402, a bracket 403, an ink jet controller 404, an ink box 405, a light source 406, a fixed rail 501, a movable rail 502, a width adjusting mechanism 503, a first driving motor 5031, a driving rod 5032, a conveying mechanism 504, a driving wheel 5041, a driven wheel 5042, a conveying belt 5043, a second driving motor 5044, a side positioning clamp plate 601, a positioning block 602, a first air cylinder 603, a vacuum chuck 701, a fixed platform 702, a vacuum jig 703, a second air cylinder 704, a guide rod 705 and a positioning hole 901.

Detailed Description

The invention is further described with reference to the accompanying drawings in which:

referring to fig. 1 to 8, an ink jet device for a shielding cover of a wireless communication product includes a rack 1, and an X-axis movement module 2, a Y-axis movement module 3, an ink jet device 4, a shielding cover feeding device 5, a side clamp positioning device 6, an adsorption jacking device 7 and a detection device 8 which are arranged on the rack 1, wherein the X-axis movement module 2 is erected on the Y-axis movement module 3, and the Y-axis movement module 3 drives the X-axis movement module 2 to move along the longitudinal direction of the rack 1; the ink jet device 4 is arranged on the X-axis motion module 2, the X-axis motion module 2 drives the ink jet device 4 to move transversely, and a piezoelectric nozzle 401 for jet printing and a solidified UV curing lamp 402 are arranged on the ink jet device 4; the shielding cover feeding device 5 is arranged on a moving path of the ink jet device 4 and is used for providing a shielding cover 9 for the ink jet device 4; the side clamp positioning device 6 is arranged on one side of the shielding cover feeding device 5 and is used for positioning and clamping the shielding cover 9; the adsorption jacking device 7 is arranged at the bottom of the shielding cover feeding device 5 and is provided with a vacuum chuck 701 for absorbing the shielding cover 9; the detection device 8 is a CCD camera for detecting the position of the shield cover 9, the position of the inkjet printing, the reading of the bar code, and the quality inspection of the inkjet printing information, which are provided on one side of the inkjet device 4.

The X-axis motion module 2 and the Y-axis motion module 3 are prior art and will not be described here.

Preferably, the inkjet device 4 includes a bracket 403 for mounting the piezoelectric nozzle 401 and the UV curing lamp 402, the bracket 403 is provided with an inkjet controller 404 and an ink cartridge 405, the ink cartridge 405 is connected with the piezoelectric nozzle 401, the piezoelectric nozzle 401 is connected with the inkjet controller 404, and the inkjet controller 404 is connected with the UV curing lamp 402.

Preferably, the shield cover feeding device 5 includes a fixed rail 501 and a movable rail 502, and a width adjusting mechanism 503 for driving the movable rail 502 to change the width between the movable rail 502 and the fixed rail 501; the width adjusting mechanism 503 includes a first driving motor 5031 and a driving rod 5032 for driving the movable rail 502 to move, and the driving rod 5032 is connected to the first driving motor 5031 through a coupling. The fixed track 501 and the movable track 502 are provided with synchronous conveying mechanisms 504, each conveying mechanism 504 comprises a driving wheel 5041 and a driven wheel 5042, each driven wheel 5042 is connected with the driving wheel 5041 through a conveying belt 5043, and each driving wheel 5041 is connected with a second driving motor 5044. By adopting the technical scheme, the first driving motor 5031 drives the connected driving rod 5032 through the coupler, so that the screw thread on the driving rod 5032 drives the nut on the movable rail 502 to move the movable rail 502, thereby adjusting the width between the fixed rail 501 and the movable rail 502; the second driving motor 5044 drives the connected conveyor 5043 to move by a driving wheel 5041, and the shield cover 9 on the conveyor 5043 moves in the direction of the printing area.

Preferably, the side clamp positioning device 6 comprises a side positioning clamp plate 601 arranged on the movable rail 502, a positioning stop 602 arranged on the movable rail 502 and a first air cylinder 603 for driving the positioning stop 602 to move up and down. With this solution, the lateral positioning clamp 601 and the positioning stop 602 can be driven by an air cylinder.

Preferably, the suction jacking device 7 includes a fixed platform 702, a vacuum fixture 703 arranged on the fixed platform 702, a second cylinder 704 driving the fixed platform 702 to ascend and descend, and a guide rod 705 assisting the fixed platform 702 to ascend and descend in a balanced manner; one side of the vacuum jig 703 is provided with a vacuum suction pipe interface, and the top of the vacuum jig 703 is provided with a vacuum sucker 701. By adopting the technical scheme, the second air cylinder 704 drives the connected fixed platform 702 to enable the vacuum fixture 703 and the vacuum chuck 701 on the fixed platform 702 to ascend or descend.

Preferably, the electronic device further comprises a main controller, wherein the main controller comprises a main control circuit board and a microprocessor arranged on the main control circuit board, and the microprocessor is electrically connected with each electronic element through the main control circuit board. By adopting the technical scheme, the main controller controls the operation of each electronic element; wherein the main controller may be a microcomputer.

An ink-jet method of a wireless signal shielding cover, comprising the steps of:

step 1: the shielding cover 9 enters the jet printing area along with the track in the feeding device;

step 2: when the shielding cover 9 enters the jet printing area, the position of the shielding cover 9 is positioned by a positioning baffle 602 and a positioning clamp plate 601 in the side clamp positioning device 6;

and step 3: after the shielding cover 9 is positioned, the vacuum chuck 701 in the adsorption jacking device 7 adsorbs the bottom of the shielding cover 9, and the shielding cover 9 is fixed;

and 4, step 4: after the shielding cover 9 is fixed, the detection device 8 detects at least two identification marks arranged on the shielding cover 9;

and 5: acquiring the position of the shielding cover 9 according to the identification;

step 6: controlling X, Y module to drive the ink-jet device 4 to move right above the shielding cover 9 for spray printing and curing according to the obtained position of the shielding cover 9;

and 7: after the jet printing is solidified, detecting whether the jet printing meets the requirements or not through a detection device 8;

and 8: after the detection, the shielding cover 9 is taken out through the rail.

Preferably, the identification Mark in step 4 is a Mark point or a feature pattern 901 arranged on the shielding cover 9; the shielding cover 9 is a metal housing.

Preferably, the step of obtaining the position of the shielding cover 9 in the step 5 includes the following sub-steps:

step 1: calling preset shape information of the shielding cover 9;

step 2: and calculating the position of the shielding cover 9 by combining the detected Mark points or characteristic graphs according to the preset shape information of the shielding cover 9.

Preferably, the taking out in the step 8 is carried out from the discharge port on the rail side by the movement of the rail.

Preferably, the inkjet printing in step 6 performs inkjet printing on the surface of the shield cover 9 by using the position and the related information edited in advance.

Preferably, when the jet printing detected in step 7 does not reach the standard, a layer is overprinted on the shielding cover 9 through an audible and visual alarm or through a pre-edited program to indicate that the jet printing is not qualified.

Preferably, the inkjet device 4 is further provided with an alarm for giving a warning by sound and light when the inkjet device is in an erroneous printing state.

Preferably, an air cylinder for driving the positioning clamp plate 601 is disposed at one side of the movable rail 502. With this solution, the lateral positioning of the shielding cover 9 is facilitated.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

In practical use, the shielding cover is conveyed to a jet printing area through a conveying belt on a feeding device, is positioned by a positioning baffle and a positioning clamping plate in the jet printing area, is adsorbed and fixed by a vacuum sucker at the bottom, then a CCD (charge coupled device) camera on an ink jet device is driven by an X, Y motion module to take a picture of the shielding cover below, the jet printing position of the shielding cover is calculated through Mark points or characteristic graphs arranged on the shielding cover, then a piezoelectric nozzle on the ink jet device is moved to the position right above the shielding cover by driving a X, Y motion module, the surface of the shielding cover is jet printed through the position edited in advance and relevant information, ink is cured through a UV curing lamp while jet printing is performed, after jet printing and curing, jet printing information and a two-dimensional code are taken by the CCD camera or read to detect whether the jet printing meets requirements or has no error information, after the shielding cover is detected to be correct, the vacuum chuck, the positioning baffle and the positioning clamping plate are reset and finally conveyed to the discharge hole through the conveying belt, so that the spray printing of the shielding cover is completed.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.