A detection and calibration device for screen printing squeegee pressure

Abstract

The utility model discloses a kind of detection calibration devices of screen printing squeegee to printing screen pressure, squeegee holder upper end is centrally fixed detection base plate, detection base plate is centrally equipped with limit slot, and limit card frame is fixed on detection base plate;Squeegee cylinder is sequentially fixed with pressure sensor through transmission rod, pressure pad;Limit slot inner fine adjustment assembly includes upper adjusting block and lower adjusting block in limit slot upper and lower superimposed, slope cooperation;When adjusting screw is reversed in screw hole, lower adjusting block is repeatedly moved along the inside and outside direction of limit slot;When squeegee cylinder drives pressure sensor to descend, abuts upper adjusting block to carry out pressure measurement. Without starting test, accurate, reliable, stablely complete the detection calibration work of squeegee to the down pressure of printing screen of silk screen printing machine, accurately control printing effect;Effectively reduce calibration operation difficulty, effectively improve calibration efficiency;Calibration device and method and the structure and process compatibility of existing silk screen printing machine equipment are good, easy to popularize and apply.

Description

Technical Field

[0001] This utility model relates to the field of screen printing, and in particular to a device for detecting and calibrating the downward pressure of the squeegee of a screen printing machine on the printing screen. Background Technology

[0002] Before operating the screen printing equipment, the pressure of the squeegee pressing the screen onto the printing plate should be calibrated and adjusted. The accuracy of this pressure adjustment directly affects the printing precision or quality of the substrate.

[0003] In existing screen printing equipment, a squeegee cylinder mounted on the printing head drives the squeegee holder downwards, causing the squeegee to press down on the printing screen. The pressure exerted by the squeegee on the printing screen is calibrated manually by adjusting the air intake pressure of the squeegee cylinder. This method can only accurately control the air intake pressure (referred to as value A), but it does not know the final pressure acting on the screen (referred to as value B). It is difficult to accurately determine whether value B, corresponding to value A, meets the standard value, resulting in inaccurate control over the printing effect. Repeated adjustments of "value A" are required. Only through a "boot-up test" debugging process can relatively good calibration results be obtained and pressure calibration completed. This process is labor-intensive, and the calibration results are unstable, affecting work efficiency. Moreover, it is difficult to operate and requires a high level of professional experience from the operator. Utility Model Content

[0004] To address the aforementioned drawbacks, the technical problem this utility model aims to solve is to provide a device for detecting and calibrating the downward pressure of a squeegee on a screen printing machine, effectively reducing the difficulty of calibration operations and significantly improving calibration efficiency. To solve the above technical problem, the technical solution adopted by this utility model is a device for detecting and calibrating the pressure of a squeegee on a screen printing machine, wherein a squeegee cylinder drives the squeegee holder to rise and fall. The device is characterized in that a detection base plate is fixedly mounted centrally on the upper end of the squeegee holder, a limiting groove is provided centrally on the detection base plate, and a limiting frame is fixedly mounted on the detection base plate; the moving part of the squeegee cylinder is fixedly connected to a pressure pad via a transmission rod, and the pressure pad is fixedly connected to a pressure sensor; the transmission rod passes through a through hole at the top of the limiting frame, and the pressure pad and pressure sensor are placed inside the limiting frame; the... The limiting groove is closed at both ends, and a fine-tuning component for adjusting the vertical movement range of the pressure sensor is provided inside the limiting groove. The fine-tuning component includes an upper adjusting block and a lower adjusting block stacked vertically inside the limiting groove, and the upper and lower mating surfaces between the upper and lower adjusting blocks are beveled. A screw hole is provided at the outer end of the limiting groove, and an adjusting screw passes through the screw hole and is movably connected to the lower adjusting block through a compression spring. When the adjusting screw rotates forward / reversely in the screw hole, it drives the lower adjusting block to move repeatedly in the inward and outward directions of the limiting groove. When the scraper cylinder drives the pressure sensor to descend, it abuts against the upper adjusting block to measure the pressure.

[0005] In one embodiment, the outer end of the limiting groove is closed by a combined limiting block, which is a cuboid formed by splicing a lower strip and an L-shaped upper strip. The screw hole is located at the splicing part of the lower strip and the L-shaped upper strip. The lower strip is bolted to the bottom of the limiting groove, and the lower strip and the L-shaped upper strip are bolted together. This facilitates the installation and adjustment of the fine-tuning component.

[0006] The beneficial effects of this utility model are that it can accurately, reliably, and stably complete the detection and calibration of the downward pressure of the squeegee on the printing screen of the screen printing machine, and accurately control the printing effect; it can obtain accurate, reliable, and stable calibration pressure without starting the machine for testing, effectively reducing the difficulty of calibration operation and effectively improving the efficiency of calibration work; the calibration device and method are highly compatible with the structure and process of existing screen printing machine equipment, and are easy to promote and apply.

[0007] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time.

[0008] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0009] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0010] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0011] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0012] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0013] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation. Attached Figure Description

[0014] Figure 1 A schematic diagram of the printing head structure of the screen printing equipment in this embodiment;

[0015] Figure 2 A schematic diagram of the printing head structure with the printing head mounting bracket removed;

[0016] Figure 3 A schematic diagram of the combined structure of the detection and calibration device for removing the cover plate;

[0017] Figure 4 This is an exploded view of the limiting groove and its fine-tuning components.

[0018] Figure 5 This is a schematic diagram of a partial exploded structure of the printing press head;

[0019] Figure 6 This is a schematic diagram of the overall exploded structure of the testing and calibration device.

[0020] Figure labeling: 1 Printing head mounting base, 2 Ink return knife and its lifting assembly, 3 Doctor blade holder, 4 Doctor blade cylinder, 5 Transmission rod, 6 Limiting frame, 601 Through hole, 7 Pressure pad, 8 Pressure sensor, 801 Contact, 9 Upper adjusting block, 10 Sealing block, 11 Lower adjusting block, 12 Combined limiting block, 13 Compression spring, 14 Adjusting screw, 15 Detection base plate, 16 Limiting groove, 161 Mounting hole, 17 Cover plate, 18 Lower strip, 19 L-shaped upper strip, 20 Screw hole. Detailed Implementation

[0021] See appendix Figure 1-6 This describes a specific structure of the present invention. The printing head is mounted on the screen printing machine via a printing head mounting base 1. The printing head includes components such as an ink return blade and its lifting assembly 2, a doctor blade holder 3, and a doctor blade cylinder 4. The doctor blade holder 3 is driven to rise and fall by the doctor blade cylinder 4.

[0022] In the screen printing squeegee pressure detection and calibration device, a detection base plate 15 is centrally mounted on the upper end of the squeegee holder 3. A limiting groove 16 is centrally located on the detection base plate 15, and a limiting frame 6 is fixedly mounted on the detection base plate 15. The moving component of the squeegee cylinder 4—the piston rod—is fixedly connected to a pressure pad 7 via a transmission rod 5. The pressure pad 7 is fixedly connected to a pressure sensor 8. The transmission rod 5 passes through a through hole 601 at the top of the limiting frame 6, and the pressure pad 7 and pressure sensor 8 are placed inside the limiting frame 6. In this example, a cover plate 17 is provided on the outside of the limiting frame 6 for positioning and protection. The transmission rod 5, pressure pad 7, and pressure sensor 8 form a combination that moves synchronously with the moving component of the squeegee cylinder 4.

[0023] The limiting groove 16 is closed at both ends, and a screw hole 20 is provided at the outer end of the limiting groove 16. In this example, to facilitate the installation and adjustment of the fine-tuning component, the outer end of the limiting groove 16 is closed by a combined limiting block 12. The combined limiting block 12 is a cuboid formed by splicing the lower strip 18 and the L-shaped upper strip 19. The screw hole 20 is located at the splicing part of the lower strip 18 and the L-shaped upper strip 18. The lower strip 18 is connected to the bottom of the limiting groove 16 by bolts and mounting holes 161, and the lower strip 18 and the L-shaped upper strip 19 are bolted together and fixed.

[0024] The inner end of the limiting groove 16 is closed by a sealing block 10, which is connected to the bottom of the limiting groove 16 by bolts and mounting holes 161.

[0025] A fine-tuning component for adjusting the vertical range of motion of the pressure sensor 8 is provided within the limiting groove 16, between the combined limiting block 12 and the closing block 10. Since the accuracy of the measurement data of the pressure sensor 8 is closely related to the downward stroke, the vertical range of motion of the pressure sensor 8 can be adjusted by this fine-tuning component when necessary.

[0026] The fine-tuning assembly includes an upper adjusting block 9 and a lower adjusting block 11 stacked vertically within a limiting groove 16, with the upper and lower mating surfaces of the upper adjusting block 9 and the lower adjusting block 11 forming a beveled fit. An adjusting screw 14 passes through the screw hole 20 and is movably connected to the front end face of the lower adjusting block 11 via a compression spring 13.

[0027] Turning the adjusting screw 14 causes the lower adjusting block 11 to move repeatedly along the inward and outward directions of the limiting groove 16 as it rotates forward and backward within the screw hole 20. During this repeated movement, the lower adjusting block 11, in conjunction with the slope, causes the upper adjusting block 9 to move up and down, thereby finely adjusting the vertical range of motion of the pressure sensor 8.

[0028] When the scraper cylinder 4 drives the pressure sensor 8 to descend, it comes into contact with the top of the upper adjusting block 9 to measure the pressure.

[0029] The method for detecting and calibrating the pressure of the squeegee on the printing screen using the above-mentioned device includes the following steps:

[0030] S1 doctor blade cylinder 4 drives pressure sensor 8 downward via transmission rod 5 and pressure pad 7, and pressure sensor 8 abuts against upper adjustment block 9. Upper adjustment block 9 abuts against lower adjustment block 11 via slope engagement, and lower adjustment block 11 drives doctor blade holder 3 to move downward via detection base plate 15, so that the doctor blade acts on the printing screen (not shown in the figure) of the printing platform.

[0031] The pressure value M measured by the S2 pressure sensor 8 is displayed on the screen (not shown in the figure). The air intake pressure of the squeegee cylinder 4 is adjusted according to this pressure value M until the pressure value M reaches the desired target value, thus completing the calibration work. Therefore, it can accurately, reliably, and stably complete the detection and calibration of the downward pressure of the squeegee on the printing screen of the screen printing machine, precisely controlling the printing effect. Accurate, reliable, and stable calibration pressure can be obtained without starting the machine for testing, effectively reducing the difficulty of calibration operations and significantly improving calibration efficiency.

[0032] Since the limiting frame 6 and the detection base plate 15 are fixedly combined to form a closed frame, the sealing block 10, the lower adjusting block 11, the combined limiting block 12, the compression spring 13, the adjusting screw 14, etc. are all installed in this frame. When the scraper cylinder 4 rises and resets, the scraper cylinder 4 lifts the limiting frame 6 through the transmission rod 5 and the pressure pad 7 in sequence, thereby driving the scraper holder 3 to reset upward through the detection base plate 15.

[0033] As can be seen from the above, by using the above-mentioned testing and calibration device, the pressure calibration work can be completed during the normal lifting and lowering process of the doctor blade cylinder 4 driving the doctor blade holder 3. The calibration device and method are well compatible with the structure and process of existing screen printing equipment and are easy to promote and apply.

[0034] The embodiments of the present invention disclosed above are merely illustrative of the present invention. The embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific implementations described. Obviously, many modifications and variations can be made based on the content of this specification. This specification selects and describes these embodiments in detail with reference to the accompanying drawings to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention. Therefore, the present invention is limited only to the claims and their full scope and equivalents, and not to the specific embodiments disclosed.

Claims

1. A device for detecting and calibrating the pressure of a squeegee on a printing screen, wherein a squeegee holder is raised and lowered by a squeegee cylinder, characterized in that, The upper end of the scraper holder is centrally mounted with a detection base plate, which has a centrally located limiting groove. A limiting frame is fixedly mounted on the detection base plate. The moving part of the scraper cylinder is fixedly connected to a pressure pad via a transmission rod, and the pressure pad is fixedly connected to a pressure sensor. The transmission rod passes through a through hole at the top of the limiting frame, and the pressure pad and pressure sensor are placed inside the limiting frame. The limiting groove is closed at both ends, and a fine-tuning component for adjusting the vertical movement range of the pressure sensor is provided inside the limiting groove. The fine-tuning component includes an upper adjusting block and a lower adjusting block stacked vertically within the limiting groove, with the upper and lower mating surfaces of the upper and lower adjusting blocks being beveled. A screw hole is provided at the outer end of the limiting groove, and an adjusting screw passes through the screw hole and is movably connected to the lower adjusting block via a compression spring. When the adjusting screw rotates forward / backward within the screw hole, it drives the lower adjusting block to move repeatedly along the inward and outward directions of the limiting groove. When the scraper cylinder drives the pressure sensor to descend, it abuts against the upper adjusting block to measure the pressure.

2. The device for detecting and calibrating the pressure of a screen printing squeegee on a printing screen as described in claim 1, characterized in that, The outer end of the limiting groove is closed by a combined limiting block, which is a cuboid formed by splicing the lower strip and the upper L-shaped strip. The screw hole is set at the splicing part of the lower strip and the upper L-shaped strip. The lower strip is connected to the bottom of the limiting groove by bolts, and the lower strip and the upper L-shaped strip are bolted together.

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