A screen coater and a method of coating using the same

Abstract

The application relates to a screen doctor blade coater and a doctor blade coating method thereof, and the screen doctor blade coater comprises a rack, a workbench, a horizontal moving platform, a UVW alignment platform, a vacuum adsorption plate, a pre-positioning mechanism, a visual alignment mechanism, a screen fixing and adjusting mechanism and a doctor blade assembly; the pre-positioning mechanism comprises a portal frame, a first left guide rail sliding block assembly, a first right guide rail sliding block assembly, a left cylinder, a right cylinder, a left positioning block and a right positioning block. When the product needs to be positioned, the left positioning block and the right positioning block are lowered to be close to the vacuum adsorption plate to form a temporary edge positioning structure, the product is placed at this time, the product is abutted against the left positioning block and the right positioning block to form pre-positioning, and then the left positioning block and the right positioning block are lifted to not block the translation of the product and the horizontal moving platform. Since the left positioning block and the right positioning block are lowered from the top and close to the vacuum adsorption plate, the product can be edge-positioned, and the situation that the product passes over the left positioning block and the right positioning block to cause positioning failure does not exist.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of screen printing, and particularly relates to a screen squeegee machine and a squeegee method thereof. BACKGROUND

[0002] Screen printing is widely applied in various fields of people's livelihood and industry, and with the continuous progress of technology, the printing precision of an automatic screen squeegee machine (also called an automatic screen printing machine) is increasingly required. Some introduce a visual alignment mechanism and a position compensation platform, place a product on the position compensation platform, the visual alignment mechanism takes a photo of the product to capture the actual position of the product, and then the position compensation platform corrects the position of the product, so as to ensure that the screen printing has high printing precision.

[0003] In the prior art, a product can be placed on the position compensation platform by using a feeding manipulator or manual feeding. When manual feeding is used, the product needs to be pre-positioned, otherwise the workload of the position compensation platform is too large, the position compensation efficiency is affected, and even the adjustment range of the position compensation platform can be exceeded, resulting in failure of position compensation. Generally, an edge positioning block is arranged on the position compensation platform, and the product is placed on the edge positioning block to achieve pre-positioning. Since the screen needs to be attached to the upper surface of the product to be printed, the edge positioning block cannot be higher than the product, otherwise the edge positioning block will lift the screen, and then affect the close-fitting degree of the screen. When the product is relatively thin, the height of the edge positioning block is too small, the positioning effect is not good, and the product is also easy to be placed above the edge positioning block, resulting in pre-positioning failure, which needs to be improved. SUMMARY

[0004] In order to solve the technical problem that when the height of the edge positioning block is small in the prior art, the positioning effect is not good or even pre-positioning fails, the present application provides a screen squeegee machine and a squeegee method thereof.

[0005] In one aspect, the technical scheme provided by the present application is as follows: a screen squeegee coater, comprising a rack, a workbench, a horizontal moving platform, a UVW alignment platform, a vacuum adsorption plate, a pre-positioning mechanism, a visual alignment mechanism, a screen fixing and adjusting mechanism and a squeegee assembly; the rack, the horizontal moving platform and the pre-positioning mechanism are all arranged on the workbench, the vacuum adsorption plate is arranged on the UVW alignment platform, the UVW alignment platform is arranged on the horizontal moving platform, the vacuum adsorption plate is used for adsorbing and fixing a product, the horizontal moving platform is used for driving the UVW alignment platform and the vacuum adsorption plate to move horizontally, when moving to an outer side end, the horizontal moving platform is used for receiving a product for feeding, when moving to an inner side end, the horizontal moving platform is used for making the product on the vacuum adsorption plate be below a screen, so as to facilitate squeegee coating; the pre-positioning mechanism comprises a portal frame, a first left guide rail sliding block assembly, a first right guide rail sliding block assembly, a left air cylinder, a right air cylinder, a left positioning block and a right positioning block, the left air cylinder is horizontally slidably arranged on the portal frame through the first left guide rail sliding block assembly, the right air cylinder is horizontally slidably arranged on the portal frame through the first right guide rail sliding block assembly, the left positioning block is arranged on the left air cylinder, the right positioning block is arranged on the right air cylinder, the left air cylinder is used for jacking the left positioning block downward, the right air cylinder is used for jacking the right positioning block downward, so that the left positioning block and the right positioning block are close to the vacuum adsorption plate, forming a temporary edge positioning structure, the left air cylinder is also used for lifting the left positioning block, the right air cylinder is also used for lifting the right positioning block, so as to avoid the left positioning block and the right positioning block from affecting horizontal movement of the product after pre-positioning; the visual alignment mechanism is arranged on the rack, and is used for performing visual fine positioning on the product after pre-positioning, the UVW alignment platform is used for driving the product to correct the position according to the result of visual fine positioning; the screen fixing and adjusting mechanism and the squeegee assembly are both arranged on the rack, the screen fixing and adjusting mechanism is used for fixing the screen and adjusting the position of the screen, and driving the screen to lift, so that the screen is lowered to be close to the upper surface of the product, and the squeegee assembly is used for squeegee coating the paint on the screen on the product below.

[0006] By adopting the above technical scheme, the left positioning block can be lifted and lowered by the left air cylinder, and the right positioning block can be lifted and lowered by the right air cylinder, when the product needs to be positioned, the left positioning block and the right positioning block are lowered to be close to the vacuum adsorption plate, forming a temporary edge positioning structure, at this time, the product can be put in, the product is abutted against the left positioning block and the right positioning block to form pre-positioning, the vacuum adsorption plate adsorbs the product, and then the left positioning block and the right positioning block are lifted, so as not to block the translation of the product and the horizontal moving platform, the horizontal moving platform can smoothly move the product to the visual alignment mechanism and below the screen for squeegee printing. Since the left positioning block and the right positioning block are lowered from above and close to the vacuum adsorption plate, the product can be edge-positioned, and there is no case that the product exceeds the left positioning block and the right positioning block, resulting in positioning failure.

[0007] Preferably, a stepped groove is arranged on the workbench, and the horizontal moving platform is arranged in the stepped groove.

[0008] By using the above technical scheme, the height of the horizontal moving platform is reduced, and accordingly, the overall height of the components in the upper half of the screen printing machine is also reduced, so that the height of the whole machine can be reduced.

[0009] Preferably, the left positioning block and the right positioning block are each provided with a right-angle positioning part at the lower end, and are respectively used for positioning the front end face and the side face of the product.

[0010] By using the above technical scheme, the front end face and the two side faces of the product are positioned, and the pre-positioning position is more accurate.

[0011] Preferably, the squeegee assembly comprises a front squeegee, a rear squeegee, a front air cylinder, a rear air cylinder and a horizontal moving mechanism, the front air cylinder and the rear air cylinder are arranged on the horizontal moving mechanism, the front squeegee is arranged on the front air cylinder, and the rear squeegee is arranged on the rear air cylinder.

[0012] Preferably, the screen fixing adjusting mechanism comprises a left screen fixing assembly, a right screen fixing assembly and a hand-operated screw rod driving assembly, the left screen fixing assembly and the right screen fixing assembly are horizontally slidably arranged on the rack, and the hand-operated screw rod driving assembly is used for driving the left screen fixing assembly and the right screen fixing assembly to move towards each other or in opposite directions.

[0013] By using the above technical scheme, the distance between the left screen fixing assembly and the right screen fixing assembly can be adjusted by the hand-operated screw rod driving assembly, so that screen fixing frames of different sizes can be fixed.

[0014] Preferably, the left screen fixing assembly and the right screen fixing assembly each comprise a screen fixing frame and a plurality of lifting air cylinders, and the lifting air cylinders are used for driving the screen fixing frame to lift.

[0015] By using the above technical scheme, the screen fixing frame is lifted by the lifting air cylinders, the product can be moved in and out when the screen fixing frame is lifted, and the screen is closely attached to the upper surface of the product when the screen fixing frame is lowered, so that the screen printing operation can be performed.

[0016] Preferably, the screen printing machine further comprises a paint dispensing mechanism, which is used for dispensing paint in strips on the screen.

[0017] By using the above technical scheme, the paint dispensing mechanism is located between the front squeegee and the rear squeegee, and the paint dispensing mechanism can not only supplement the paint, but also dispense the paint in strips on the screen, so that the paint does not need to be manually spread open, and the paint does not need to be manually added frequently.

[0018] Preferably, the visual alignment mechanism comprises a mounting plate, a second left guide rail slider assembly, a left CCD industrial camera, a left driving mechanism, a second right guide rail slider assembly, a right CCD industrial camera and a right driving mechanism, the mounting plate is arranged on a rack, the left CCD industrial camera is slidably arranged on the mounting plate through the second left guide rail slider assembly, and the left driving mechanism is used to drive the left CCD industrial camera to move horizontally; the right CCD industrial camera is slidably arranged on the mounting plate through the second right guide rail slider assembly, and the right driving mechanism is used to drive the right CCD industrial camera to move horizontally.

[0019] By adopting the technical scheme, when the product is replaced, the left driving mechanism can move the left CCD industrial camera to a suitable position, and the right driving mechanism can move the right CCD industrial camera to a suitable position, so that the mark points on the product can be better photographed.

[0020] In addition, the application also provides another technical scheme: a screen coating method of the screen coating machine, comprising the following steps:

[0021] S1, the horizontal moving platform moves the UVW alignment platform and the vacuum adsorption plate to the outer end;

[0022] S2, the left positioning block and the right positioning block in the pre-positioning mechanism fall down, the product is placed on the vacuum adsorption plate by manual, and the side surface of the product is abutted with the left positioning block and the right positioning block to form pre-positioning, the product is vacuum adsorbed by the vacuum adsorption plate, and the left positioning block and the right positioning block in the pre-positioning mechanism are lifted up;

[0023] S3, the horizontal moving platform moves the UVW alignment platform, the vacuum adsorption plate and the product as a whole to below the visual alignment mechanism, the visual alignment mechanism photographs and positions the product, and the UVW alignment platform drives the product to be corrected in position according to the result of visual fine positioning;

[0024] S4, the horizontal moving platform moves the UVW alignment platform, the vacuum adsorption plate and the product as a whole to below the screen, the screen fixing and adjusting mechanism lowers the screen, the screen is attached to the upper surface of the product, the doctor blade assembly performs coating operation, the screen is lifted up after coating is completed, the horizontal moving platform moves the UVW alignment platform, the vacuum adsorption plate and the product as a whole to the outer end, and the product is taken away by manual.

[0025] In summary, the application has at least one of the following beneficial technical effects:

[0026] 1. The application adopts a movable pre-positioning mechanism. When the product needs to be positioned, the left positioning block and the right positioning block descend and approach the vacuum adsorption plate to form a temporary edge positioning structure. Since the left positioning block and the right positioning block descend from above and approach the vacuum adsorption plate, the product can be edge-positioned, and there is no case that the product exceeds the left positioning block and the right positioning block, resulting in positioning failure.

[0027] 2. The left positioning block and the right positioning block are each provided with a right-angle positioning part at the lower end, which is used for positioning the front end face and the side face of the product. In this way, the front end face and the two side faces of the product are positioned, and the pre-positioning position is more accurate.

[0028] 3. The paint dispensing mechanism not only can supplement paint, but also can dispense paint in strips on the screen. In this way, the paint does not need to be artificially spread open, and manual frequent addition of paint is not needed. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A top view of the screen squeegee machine according to the embodiment of the application is shown;

[0030] Figure 2 A perspective view of the screen squeegee machine according to the embodiment of the application is shown;

[0031] Figure 3 A perspective view of the screen squeegee machine according to the embodiment of the application is shown;

[0032] Figure 4 A structural schematic view of the lower half of the screen squeegee machine according to the embodiment of the application is shown;

[0033] Figure 5 A structural schematic view of the upper half of the screen squeegee machine according to the embodiment of the application is shown;

[0034] Figure 6 A structural schematic view of the upper half of the screen squeegee machine according to the embodiment of the application is shown;

[0035] Figure 7 A structural schematic view of the pre-positioning mechanism according to the embodiment of the application is shown;

[0036] Figure 8 A structural schematic view of the pre-positioning mechanism according to the embodiment of the application is shown; Figure 7 An enlarged view of position A in FIG. 8;

[0037] Figure 9 A schematic view of the positional relationship between the UVW alignment platform and the vacuum adsorption plate according to the embodiment of the application is shown;

[0038] Figure 10 A schematic view of the cooperation relationship between the rack, the screen fixing and adjusting mechanism, and the squeegee assembly according to the embodiment of the application is shown.

[0039] Explanation of reference signs: 1, rack; 11, upper frame; 12, lower frame; 13, first vertical column; 14, second vertical column; 15, third vertical column; 2, workbench; 21, stepped groove; 3, horizontal moving platform; 4, UVW alignment platform; 5, vacuum adsorption plate; 6, pre-positioning mechanism; 61, gantry; 62, first left guide rail slider assembly; 63, first right guide rail slider assembly; 64, left air cylinder; 65, right air cylinder; 66, left positioning block; 661, right-angle positioning part; 662, arc-shaped screw hole; 67, right positioning block; 7, visual alignment mechanism; 71, mounting plate; 72, second left guide rail slider assembly; 73, left CCD industrial camera; 74, left driving mechanism; 75, second right guide rail slider assembly; 76, right CCD industrial camera; 77, right driving mechanism; 8, screen fixing and adjusting mechanism; 81, left screen fixing assembly; 82, right screen fixing assembly; 821, screen fixing frame; 822, lifting air cylinder; 83, hand-operated screw rod driving assembly; 9, squeegee assembly; 91, front squeegee; 92, rear squeegee; 93, front air cylinder; 94, horizontal moving mechanism; 100, paint dispensing mechanism; 101, dispensing assembly; 102, horizontal driving mechanism; 200, screen. DETAILED DESCRIPTION

[0040] The above description is combined with the accompanying drawings. Figures 1-10 The application is further described in detail.

[0041] With reference to Figures 1 to 3 , the application discloses a screen squeegee machine, which comprises a rack 1, a workbench 2, a horizontal moving platform 3, a UVW alignment platform 4, a vacuum adsorption plate 5, a pre-positioning mechanism 6, a visual alignment mechanism 7, a screen fixing and adjusting mechanism 8, and a squeegee assembly 9. The rack 1, the horizontal moving platform 3, and the pre-positioning mechanism 6 are all arranged on the workbench 2. The vacuum adsorption plate 5 is arranged on the UVW alignment platform 4. The UVW alignment platform 4 is arranged on the horizontal moving platform 3. The vacuum adsorption plate 5 is used for adsorbing and fixing products. The horizontal moving platform 3 is used for driving the UVW alignment platform 4 and the vacuum adsorption plate 5 to move horizontally. When the horizontal moving platform 3 moves to the outer end, the horizontal moving platform 3 is used for receiving products. When the horizontal moving platform 3 moves to the inner end, the products on the vacuum adsorption plate 5 are located below the screen 200, so as to facilitate squeegee coating.

[0042] With reference to Figure 4 , the workbench 2 is provided with a stepped groove 21, and the horizontal moving platform 3 is arranged in the stepped groove 21. The height of the horizontal moving platform 3 is reduced, and correspondingly, the overall height of the components in the upper half of the screen squeegee machine can also be reduced, so that the height of the whole machine can be reduced.

[0043] With reference to Figure 7 and Figure 8The pre-positioning mechanism 6 comprises a portal frame 61, a first left guide rail slider assembly 62, a first right guide rail slider assembly 63, a left cylinder 64, a right cylinder 65, a left positioning block 66 and a right positioning block 67. The left cylinder 64 is horizontally slidably arranged on the portal frame 61 through the first left guide rail slider assembly 62, the right cylinder 65 is horizontally slidably arranged on the portal frame 61 through the first right guide rail slider assembly 63, the left positioning block 66 is arranged on the left cylinder 64, and the right positioning block 67 is arranged on the right cylinder 65. The left cylinder 64 is used for jacking the left positioning block 66 downward, and the right cylinder 65 is used for jacking the right positioning block 67 downward, so that the left positioning block 66 and the right positioning block 67 are close to the vacuum adsorption plate 5 to form a temporary edge positioning structure. The left cylinder 64 is also used for lifting the left positioning block 66, and the right cylinder 65 is also used for lifting the right positioning block 67, so as to avoid the influence of the left positioning block 66 and the right positioning block 67 on the horizontal movement of the product after pre-positioning. Since the first left guide rail slider assembly 62 and the first right guide rail slider assembly 63 are arranged, the distance between the left positioning block 66 and the right positioning block 67 can be adjusted to adapt to products of different sizes.

[0044] With reference to Figure 8 The lower end of each of the left positioning block 66 and the right positioning block 67 is provided with a right-angle positioning part 661 for positioning the front end face and the side face of the product. In this way, the front end face and the two side faces of the product are positioned, and the pre-positioning position is more accurate. In addition, two arc-shaped screw holes 662 are arranged on each of the left positioning block 66 and the right positioning block 67, and are fixed on the left cylinder 64 and the right cylinder 65 through two screws. When the screws are loosened, the left positioning block 66 and the right positioning block 67 can be rotated and adjusted in the horizontal plane to form an outer horn shape of the positioning wall of the side face of the left positioning block 66 and the right positioning block 67, so as to guide the product into the left positioning block 66 and the right positioning block 67 and finally center the product, thereby ensuring good positioning accuracy.

[0045] With reference to Figure 6The visual alignment mechanism 7 is arranged on the frame 1 and used for visual fine positioning of the positioned product. The UVW alignment platform 4 is used for position correction of the product according to the result of the visual fine positioning. Specifically, the visual alignment mechanism 7 comprises a mounting plate 71, a second left guide rail sliding block assembly 72, a left CCD industrial camera 73, a left driving mechanism 74, a second right guide rail sliding block assembly 75, a right CCD industrial camera 76 and a right driving mechanism 77. The mounting plate 71 is arranged on the frame 1. The left CCD industrial camera 73 is slidingly arranged on the mounting plate 71 through the second left guide rail sliding block assembly 72. The left driving mechanism 74 is used for driving the left CCD industrial camera 73 to move horizontally. The right CCD industrial camera 76 is slidingly arranged on the mounting plate 71 through the second right guide rail sliding block assembly 75. The right driving mechanism 77 is used for driving the right CCD industrial camera 76 to move horizontally. When producing a certain product, the left CCD industrial camera 73 and the right CCD industrial camera 76 are fixed and can be used for photographing positioning of the product translated thereto. When the product is changed, parameters can be input through a control system, so that the left driving mechanism 74 moves the left CCD industrial camera 73 to a proper position and the right driving mechanism 77 moves the right CCD industrial camera 76 to a proper position, so as to better photograph the mark points on the product.

[0046] With reference to Figure 5 and Figure 6 The screen fixing and adjusting mechanism 8 and the squeegee assembly 9 are arranged on the frame 1. The screen fixing and adjusting mechanism 8 is used for fixing the screen 200 and adjusting the position of the screen 200 and driving the screen 200 to ascend and descend, so that the screen 200 is lowered to be attached to the upper surface of the product. The squeegee assembly 9 is used for squeegeeing the paint on the screen 200 to the product below. Specifically, the squeegee assembly 9 comprises a front squeegee 91, a rear squeegee 92, a front air cylinder 93, a rear air cylinder (not shown) and a horizontal moving mechanism 94. The front air cylinder 93 and the rear air cylinder are arranged on the horizontal moving mechanism 94. The front squeegee 91 is arranged on the front air cylinder 93. The rear squeegee 92 is arranged on the rear air cylinder. When squeegeeing the paint, the front squeegee 91 is raised, the rear squeegee 92 is lowered, the horizontal moving mechanism 94 drives the front squeegee 91 and the rear squeegee 92 to move horizontally, and the rear squeegee 92 squeegees the paint to the upper surface of the product. Then, the front squeegee 91 is lowered, the rear squeegee 92 is raised, the horizontal moving mechanism 94 drives the front squeegee 91 and the rear squeegee 92 to horizontally return, and the front squeegee 91 squeegees the paint more uniformly, especially the thickness of the paint reaches the requirement, and the paint can be repeatedly used between the front squeegee 91 and the rear squeegee 92.

[0047] The screen fixing adjusting mechanism 8 comprises a left screen fixing assembly 81, a right screen fixing assembly 82 and a hand-operated screw rod driving assembly 83. The left screen fixing assembly 81 and the right screen fixing assembly 82 are horizontally slidably arranged on the rack 1, and the hand-operated screw rod driving assembly 83 is used to drive the left screen fixing assembly 81 and the right screen fixing assembly 82 to move towards or away from each other. The left screen fixing assembly 81 and the right screen fixing assembly 82 each comprise a screen fixing frame 821 and a plurality of lifting cylinders 822, and the lifting cylinders 822 are used to drive the screen fixing frame 821 to lift. The distance between the left screen fixing assembly 81 and the right screen fixing assembly 82 can be adjusted by the hand-operated screw rod driving assembly 83, so that screen fixing frames 821 of different sizes can be fixed. The lifting cylinders 822 drive the screen fixing frame 821 to lift, and when the screen fixing frame 821 is lifted, the product can be moved in and out, and when the screen fixing frame 821 is lowered, the screen 200 is tightly attached to the upper surface of the product, and the squeegee coating operation can be performed.

[0048] With reference to Figure 5 , the screen squeegee coating machine further comprises a paint dispensing mechanism 100 for dispensing paint strips on the screen. The paint dispensing mechanism 100 is located between the front squeegee 91 and the rear squeegee 92, and the paint dispensing mechanism 100 comprises a dispensing assembly 101 and a horizontal driving mechanism 102 for driving the dispensing assembly 101 to move horizontally. The translation direction of the dispensing assembly 101 is parallel to the front squeegee 91 and the rear squeegee 92. The paint dispensing mechanism 100 not only replenishes paint, but also dispenses paint strips on the screen 200, so that the paint does not need to be manually spread and the paint does not need to be manually added frequently.

[0049] With reference to Figure 10 , the rack 1 comprises an upper frame 11, a lower frame 12, two first vertical columns 13, two second vertical columns 14 and two third vertical columns 15. The first vertical columns 13 and the second vertical columns 14 are arranged on the workbench 2 and are used to support and fix the lower frame 12. The third vertical columns 15 are arranged on the lower frame 12 and support and fix the upper frame 11 together with the first vertical columns 13. The screen fixing adjusting mechanism 8 is arranged on the lower frame 12, and the hand-operated screw rod driving assembly 83 is arranged on the rear end side of the lower frame 12, which is convenient for manual operation and adjustment. The squeegee assembly 9 is suspended on the upper frame 11, and the horizontal moving mechanism 94 in the squeegee assembly 9 is arranged on the upper frame 11.

[0050] The third column 15 is located in the middle section of the Y-direction cross beam of the lower frame 12, and the Y-direction size of the upper frame 11 is smaller than that of the lower frame 12. The reason for such arrangement is that, on the one hand, the left screen fixing assembly 81 and the right screen fixing assembly 82 (mainly referring to the end of the left screen fixing assembly 81 and the right screen fixing assembly 82, because the left screen fixing assembly 81 and the right screen fixing assembly 82 need to be matched with the hand-operated screw rod driving assembly 83, resulting in that the structure of the end of the left screen fixing assembly 81 and the right screen fixing assembly 82 is relatively complex and the space occupied is slightly larger), under the condition of the same outer size of the rack 1, the distance between the left screen fixing assembly 81 and the right screen fixing assembly 82 is close to the maximum, and the size of the screen that can be accommodated is larger; on the other hand, the size of the upper frame 11 is smaller, which saves materials; on the other hand, when the doctor blade assembly 9 works, vibration will be generated during the translation movement, and the third column 15 is located in the middle section of the Y-direction cross beam of the lower frame 12, which can increase the transmission distance of the vibration, and the vibration is gradually weakened during the transmission process, thereby reducing the influence of the above vibration on the screen fixing and adjusting mechanism 8 on the lower frame 12.

[0051] The working process of the screen doctor coating machine described in the present application is described as follows: the doctor coating method comprises the following steps:

[0052] S1, the horizontal moving platform 3 moves the UVW alignment platform 4 and the vacuum suction plate 5 to the outer end;

[0053] S2, the left positioning block 66 and the right positioning block 67 in the pre-positioning mechanism 6 fall down, the product is placed on the vacuum suction plate 5 by hand, and the side surface of the product is in abutment with the left positioning block 66 and the right positioning block 67 to form pre-positioning, the product is vacuum-sucked by the vacuum suction plate 5, and the left positioning block 66 and the right positioning block 67 in the pre-positioning mechanism 6 are lifted up;

[0054] S3, the horizontal moving platform 3 moves the UVW alignment platform 4, the vacuum suction plate 5 and the product as a whole to below the visual alignment mechanism 7, the visual alignment mechanism 7 takes a photo of the product for positioning, and the UVW alignment platform 4 corrects the position of the product according to the result of the visual fine positioning;

[0055] S4, the horizontal moving platform 3 moves the UVW alignment platform 4, the vacuum suction plate 5 and the product as a whole to below the screen, the screen fixing and adjusting mechanism 8 lowers the screen, the screen is in abutment with the upper surface of the product, the coating dispensing mechanism 100 dispenses the coating on the screen 200, the doctor blade assembly 9 performs doctor coating work, after the doctor coating is completed, the screen 200 is lifted up, the horizontal moving platform 3 moves the UVW alignment platform 4, the vacuum suction plate 5 and the product as a whole to the outer end, the product is taken away by hand, and the doctor coating printing task of one product is completed.

[0056] The implementation principle of the present application is that the present application adopts a movable pre-positioning mechanism 6, the left cylinder 64 can drive the left positioning block 66 to ascend and descend, the right cylinder 65 can drive the right positioning block 67 to ascend and descend, when positioning products is needed, the left positioning block 66 and the right positioning block 67 descend, close to the vacuum adsorption plate 5, forming a temporary edge positioning structure, at this time, the product can be put in, the product is abutted with the left positioning block 66 and the right positioning block 67, forming pre-positioning, then the left positioning block 66 and the right positioning block 67 are lifted up, without blocking the translation of the product and the horizontal moving platform 3, the horizontal moving platform 3 can smoothly move the product to the vision alignment mechanism 7 and below the silk screen 200, for squeegee printing. Since the left positioning block 66 and the right positioning block 67 descend from above and close to the vacuum adsorption plate 5, the edge of the product can be positioned, and there is no case that the product exceeds the left positioning block 66 and the right positioning block 67, resulting in positioning failure.

[0057] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A screen coating machine, characterized in that, include: The frame (1), worktable (2), horizontal moving platform (3), UVW alignment platform (4), vacuum adsorption plate (5), pre-positioning mechanism (6), vision alignment mechanism (7), wire mesh fixing and adjustment mechanism (8), and scraper assembly (9). The frame (1), the horizontal moving platform (3) and the pre-positioning mechanism (6) are all set on the workbench (2). The vacuum adsorption plate (5) is set on the UVW alignment platform (4). The UVW alignment platform (4) is set on the horizontal moving platform (3). The vacuum adsorption plate (5) is used to adsorb and fix the product. The horizontal moving platform (3) is used to drive the UVW alignment platform (4) and the vacuum adsorption plate (5) to move horizontally. When it moves to the outer end, it is used to receive the product loading. When it moves to the inner end, it makes the product on the vacuum adsorption plate (5) located below the screen for easy coating. The pre-positioning mechanism (6) includes a gantry frame (61), a first left guide rail slider assembly (62), a first right guide rail slider assembly (63), a left cylinder (64), a right cylinder (65), a left positioning block (66), and a right positioning block (67). The left cylinder (64) is horizontally slidably mounted on the gantry frame (61) via the first left guide rail slider assembly (62). The right cylinder (65) is horizontally slidably mounted on the gantry frame (61) via the first right guide rail slider assembly (63). The left positioning block (66) is mounted on the left cylinder (64). The right positioning block (67) is mounted on the left cylinder (64). Positioning block (67) is set on right cylinder (65). Left cylinder (64) is used to push left positioning block (66) downward and right cylinder (65) is used to push right positioning block (67) downward, so that left positioning block (66) and right positioning block (67) are close to vacuum adsorption plate (5) to form temporary edge positioning structure. Left cylinder (64) is also used to lift left positioning block (66) and right cylinder (65) is also used to lift right positioning block (67) to avoid left positioning block (66) and right positioning block (67) affecting the horizontal movement of product after pre-positioning. The lower ends of the left positioning block (66) and the right positioning block (67) are provided with right-angle positioning parts (661), which are used to position the front end and the side of the product respectively; the left positioning block (66) and the right positioning block (67) are provided with two arc-shaped screw holes (662), which are fixed to the left cylinder (64) and the right cylinder (65) by two screws. When the screws are loosened, the left positioning block (66) and the right positioning block (67) can be rotated and adjusted in the horizontal plane, so that the positioning walls on the sides of the left positioning block (66) and the right positioning block (67) form an outer trumpet shape to guide the product into the left positioning block (66) and the right positioning block (67) and center the product; The visual alignment mechanism (7) is mounted on the frame (1) and is used to perform visual fine positioning of the pre-positioned product. The UVW alignment platform (4) is used to drive the product to perform position correction based on the result of the visual fine positioning. The scraper assembly (9) includes a front scraper (91), a rear scraper (92), a front cylinder (93), a rear cylinder, and a horizontal moving mechanism (94). Both the front cylinder (93) and the rear cylinder are mounted on the horizontal moving mechanism (94). The front scraper (91) is mounted on the front cylinder (93), and the rear scraper (92) is mounted on the rear cylinder. The scraper assembly (9) is used to scrape the coating from the screen onto the product below. During coating application, the front scraper (91)... The front scraper (91) rises, the rear scraper (92) falls, and the horizontal moving mechanism (94) drives the front scraper (91) and the rear scraper (92) to move horizontally. The rear scraper (92) scrapes the paint onto the upper surface of the product. Then the front scraper (91) falls, the rear scraper (92) rises, and the horizontal moving mechanism (94) drives the front scraper (91) and the rear scraper (92) to return horizontally. The paint thickness meets the requirements, and the paint is kept between the front scraper (91) and the rear scraper (92). The wire mesh fixing and adjusting mechanism (8) and the scraper assembly (9) are both mounted on the frame (1). The wire mesh fixing and adjusting mechanism (8) is used to fix the wire mesh, adjust the position of the wire mesh, and drive the wire mesh to rise and fall so that the wire mesh descends and fits against the upper surface of the product. The wire mesh fixing and adjusting mechanism (8) includes a left wire mesh fixing component (81), a right wire mesh fixing component (82), and a hand crank screw drive component (83). The left wire mesh fixing component (81) and the right wire mesh fixing component (82) are horizontally slidably mounted on the frame (1). The hand crank screw drive component (83) is used to drive the left wire mesh fixing component (81) and the right wire mesh fixing component (82) to move in opposite directions or in the opposite direction. The left wire mesh fixing component (81) and the right wire mesh fixing component (82) each include a wire mesh fixing frame (821) and multiple lifting cylinders (822). The lifting cylinders (822) are used to drive the wire mesh fixing frame (821) to rise and fall.

2. The screen coating machine according to claim 1, characterized in that, The workbench (2) is provided with a step groove (21), and the horizontal moving platform (3) is set in the step groove (21).

3. The screen coating machine according to claim 1, characterized in that, The vision alignment mechanism (7) includes a mounting plate (71), a second left guide rail slider assembly (72), a left CCD industrial camera (73), a left drive mechanism (74), a second right guide rail slider assembly (75), a right CCD industrial camera (76), and a right drive mechanism (77). The mounting plate (71) is mounted on the frame (1). The left CCD industrial camera (73) is slidably mounted on the mounting plate (71) via the second left guide rail slider assembly (72). The left drive mechanism (74) is used to drive the left CCD industrial camera (73) to move horizontally. The right CCD industrial camera (76) is slidably mounted on the mounting plate (71) via the second right guide rail slider assembly (75). The right drive mechanism (77) is used to drive the right CCD industrial camera (76) to move horizontally.

4. A coating method for a screen coating machine according to any one of claims 1 to 3, characterized in that, Includes the following steps: S1, the horizontal moving platform (3) moves the UVW alignment platform (4) and the vacuum adsorption plate (5) to the outer end; S2, the left positioning block (66) and the right positioning block (67) in the pre-positioning mechanism (6) fall down, and the product is placed on the vacuum adsorption plate (5) by the operator, and the side of the product abuts against the left positioning block (66) and the right positioning block (67) to form a pre-positioning. The vacuum adsorption plate (5) vacuum adsorbs the product and raises the left positioning block (66) and the right positioning block (67) in the pre-positioning mechanism (6). S3, the horizontal moving platform (3) moves the UVW alignment platform (4), the vacuum adsorption plate (5) and the product together to the underside of the visual alignment mechanism (7). The visual alignment mechanism (7) takes pictures and positions the product. The UVW alignment platform (4) corrects the position of the product based on the result of the visual precision positioning. S4, the horizontal moving platform (3) moves the UVW alignment platform (4), vacuum adsorption plate (5) and product together to the bottom of the screen. The screen fixing and adjusting mechanism (8) lowers the screen so that the screen and the upper surface of the product are in contact. The scraper assembly (9) performs the scraping operation. After the scraping is completed, the screen is raised. The horizontal moving platform (3) moves the UVW alignment platform (4), vacuum adsorption plate (5) and product together to the outer end. The product is then manually removed.

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