Vacuum screen printer

Abstract

The application discloses a vacuum screen printing machine, which comprises a machine shell, a first conveying mechanism, a third sealing ring, a cover plate and a second sealing frame which can be lifted, a stepped inlet and outlet opening is formed in the top plate of the machine shell, a first sealing frame is arranged at the bottom of the groove of the inlet and outlet opening, a first workbench is provided with a fence for enclosing a printing object, and a first inclined surface is arranged on the upper surface of the fence; the second sealing frame is arranged in the lower through opening of the inlet and outlet opening and the opening surrounded by the first sealing frame, a second sealing ring is arranged between the outer wall of the second sealing frame and the side wall of the opening, the second sealing ring realizes the sealing between the upper groove and the inner cavity of the machine shell, the second sealing frame is provided with a second inclined surface matched with the first inclined surface, the third sealing ring is arranged between the first inclined surface and the second inclined surface, and the third sealing ring has very good sealing performance between the second sealing frame and the fence; the cover plate can seal the upper groove; and the cover plate, the top plate, the second sealing frame and the first workbench form a compartment for containing the printing object.

Description

Technical Field

[0001] This invention relates to the field of screen printing equipment technology, and in particular to a vacuum screen printing machine. Background Technology

[0002] A screen printing machine is a type of printing machine that uses a screen printing plate to apply printing. It's also called a screen printing machine and is used to print text and images. Screen printing machines can be divided into ordinary screen printing machines and vacuum screen printing machines. A vacuum screen printing machine consists of a housing and a screen printing mechanism located within the housing's inner cavity. The housing has inlet / outlet ports and a sealing door. The substrate is placed on the worktable, and the inner cavity of the housing is evacuated. The screen printing mechanism then applies the printing to the substrate. Vacuum screen printing machines can meet specific screen printing environments. The vacuum environment created within the housing makes the sealing of the inlet / outlet ports through which the substrate passes particularly important. Currently, the loading and unloading devices are positioned corresponding to the inlet / outlet ports. When loading or unloading from the worktable, the vacuum within the housing is easily broken, affecting the screen printing process and requiring additional time and energy to restore the vacuum within the housing. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a vacuum screen printing machine with good sealing performance and high working efficiency.

[0004] According to an embodiment of the present invention, a vacuum screen printing machine includes a housing, a first conveying mechanism, a third sealing ring, a cover plate, and a liftable second sealing frame. A stepped inlet / outlet is provided on the top plate of the housing. The inlet / outlet includes a coaxial and connected upper groove and a lower through-hole. The length and width of the upper groove are larger than the lower through-hole. The bottom of the upper groove is provided with the first sealing frame. The first conveying mechanism is connected to the inner wall of the housing. One end of the first conveying mechanism is located below the inlet / outlet, and the other end is located below the screen printing mechanism. A first worktable is provided on the first conveying mechanism for supporting the printing substrate. The workbench is equipped with a barrier to enclose the printing substrate, and the upper surface of the barrier has a first inclined surface; a second sealing frame passes through the opening formed by the lower opening and the first sealing frame, and a second sealing ring is provided between the outer wall of the second sealing frame and the side wall of the opening; the lower surface of the second sealing frame has a second inclined surface that matches the first inclined surface; a third sealing ring is provided on the second sealing frame or the barrier, and the third sealing ring is located between the first inclined surface and the second inclined surface; the cover plate can seal and cover the upper groove, and the cover plate, the top plate, the second sealing frame and the first workbench form a compartment for accommodating the printing substrate.

[0005] It has at least the following beneficial effects: the first and second inclined surfaces match, so that the third sealing ring provides a very good seal between the second sealing frame and the enclosure; the second sealing ring seals the upper groove and the inner cavity of the machine housing; the cover plate can seal the upper groove; the cover plate, the top plate, the second sealing frame and the first worktable form a compartment for accommodating the printing substrate.

[0006] According to some embodiments of the present invention, a second conveying mechanism and a first lifting drive mechanism are further included. The second conveying mechanism is connected to the inner wall of the housing. The second conveying mechanism is parallel to the first conveying mechanism. The second conveying mechanism and the first conveying mechanism are horizontally offset and located below the first conveying mechanism. A second worktable is provided on the second conveying mechanism. The second worktable is used to carry another printing substrate. A barrier for surrounding the printing substrate is also provided on the second worktable. The upper surface of the barrier is also provided with a first inclined surface. The first lifting drive mechanism is located inside the housing and below the inlet / outlet. The first lifting drive mechanism can abut against the lower surface of the second worktable to drive the second worktable to rise and fall. The cover plate can seal and cover the upper groove. The cover plate, the top plate, the second sealing frame and the second worktable form a compartment for accommodating the printing substrate.

[0007] According to some embodiments of the present invention, the first conveying mechanism includes two parallel first conveyor belts, and the two ends of the first worktable are respectively connected to the two first conveyor belts.

[0008] According to some embodiments of the present invention, the second conveying mechanism includes two parallel second conveyor belts, both of which are located below the two first conveyor belts. The two ends of the second worktable can be connected to the two second conveyor belts respectively. The first lifting drive mechanism is located below the two second conveyor belts, and the output end of the first lifting drive mechanism faces upward and can abut against the lower surface of the second worktable.

[0009] According to some embodiments of the present invention, a pressure plate is provided around the upper surface of the second sealing frame, the pressure plate extending above the first sealing frame to block the intersection between the second sealing frame and the first sealing frame.

[0010] According to some embodiments of the present invention, the first workbench includes a base plate and a platform disposed on the base plate, the enclosure is connected to the base plate and surrounds the platform, and the platform is used to support the printing substrate.

[0011] According to some embodiments of the present invention, a rotating shaft is further included, which is rotatably disposed on the housing in a region near the inlet / outlet. The straight line of the rotating shaft is parallel to the plane of the inlet / outlet. One end of the cover plate is connected to the rotating shaft, and the plane of the cover plate is parallel to the straight line of the rotating shaft.

[0012] According to some embodiments of the present invention, the housing is provided with a boss in the area next to the inlet and outlet, and a linear drive device is hinged to the boss. The orthographic projection of the linear drive device on the plane where the inlet and outlet are located is next to the inlet and outlet. The output end of the linear drive device is hinged to a first ear plate, which is connected to the rotating shaft. The first ear plate forms an obtuse angle with the cover plate.

[0013] According to some embodiments of the present invention, the number of linear drive devices is two, the number of first ear plates is two, one of the linear drive devices is connected to one end of the rotating shaft through one of the first ear plates, and the other linear drive device is connected to the other end of the rotating shaft through the other first ear plate.

[0014] According to some embodiments of the present invention, a second lifting drive mechanism is provided inside the housing, the output end of the second lifting drive mechanism faces upward and is connected to the second sealing frame, and the second sealing frame is located above the first worktable.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0018] Figure 2 This is a cross-sectional view of the first workbench, the second workbench, the first sealing frame, the second sealing frame, the second sealing ring, the enclosure, and the third sealing ring in an embodiment of the present invention.

[0019] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0020] Figure 4 This is a schematic diagram of the structure of the first conveying mechanism, the first worktable, the second conveying mechanism, the second worktable, the second lifting drive mechanism, and the second sealing frame in an embodiment of the present invention;

[0021] Figure 5This is a schematic diagram of the linear drive device, rotating shaft, and cover plate in an embodiment of the present invention.

[0022] Reference numerals in the attached figures: housing 100, boss 110, linear drive device 111, first ear plate 112, mounting plate 113, second lifting drive mechanism 120, bearing seat 130, damping clutch 140, encoder 150, upper groove 160, first sealing frame 161, lower opening 170, first conveying mechanism 200, first worktable 210, base plate 211, table plate 212, fifth sealing ring 213, second conveying mechanism 300, second worktable 310, second sealing frame 400, second inclined surface 410, second sealing ring 420, pressure plate 430, fourth sealing ring 440, rotating shaft 500, second ear plate 510, cover plate 600, sealing gasket 610, first sealing ring 700, enclosure 800, first inclined surface 810, third sealing ring 900. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 limiting this invention.

[0025] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0026] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0027] Reference Figures 1 to 4This invention discloses a vacuum screen printing machine, including a housing 100, a first conveying mechanism 200, a third sealing ring 900, a cover plate 600, and a liftable second sealing frame 400. The housing 100 has an inner cavity containing a screen printing mechanism (not shown in the figure). A stepped inlet / outlet is provided on the top plate of the housing 100. The inlet / outlet includes a coaxial and connected upper groove 160 and a lower opening 170. The upper groove 160 is larger in length and width than the lower opening 170. A first sealing frame 161 is provided at the bottom of the upper groove 160, supporting the first sealing frame 161. The first sealing frame 161 does not obstruct the lower opening 170, allowing the substrate to pass normally through the inlet / outlet.

[0028] The first conveying mechanism 200 is connected to the inner wall of the housing 100. One end of the first conveying mechanism 200 is located below the inlet / outlet, and the other end is located below the screen printing mechanism. The first conveying mechanism 200 is equipped with a first worktable 210, which is used to carry the printing substrate. The first conveying mechanism 200 conveys the printing substrate between the inlet / outlet and the screen printing mechanism through the first worktable 210. The first worktable 210 is equipped with a barrier 800 for surrounding the printing substrate. The upper surface of the barrier 800 is provided with a first inclined surface 810. The second sealing frame 400 passes through the opening formed by the lower opening 170 and the first sealing frame 161. A second sealing ring 420 is provided between the outer wall of the second sealing frame 400 and the side wall of the opening. The second sealing ring 420 seals the upper groove 160 with the inner cavity of the housing 100.

[0029] The lower surface of the second sealing frame 400 is provided with a second inclined surface 410 that matches the first inclined surface 810. The third sealing ring 900 is provided on the second sealing frame 400 or the enclosure 800, and the third sealing ring 900 is located between the first inclined surface 810 and the second inclined surface 410. When the second sealing frame 400 descends and abuts against the first worktable 210, the matching of the first inclined surface 810 and the second inclined surface 410 provides excellent sealing between the second sealing frame 400 and the enclosure 800. The cover plate 600 can seal and cover the upper groove 160. The cover plate 600, the top plate, the second sealing frame 400, and the first worktable 210 form a compartment for accommodating the printing substrate.

[0030] When loading and unloading materials in the vacuum screen printing machine, a seal is required between the partition and the inner cavity of the machine housing 100. When the first worktable 210 moves below the inlet / outlet, the second sealing frame 400 descends and abuts against the first worktable 210, and the third sealing ring 900 achieves a seal between the second sealing frame 400 and the enclosure 800. Due to the lifting and lowering movement of the second sealing frame 400, the arrangement of the first sealing frame 161 and the second sealing ring 420 can achieve a seal between the upper groove 160 and the inner cavity of the machine housing 100, ultimately achieving a seal between the internal space of the partition and the inner cavity of the machine housing 100. At this time, the cover plate 600 is in the open state, and the printing substrate can be directly placed or removed onto the first worktable 210. The cover plate 600 is placed on the top plate, and the cover plate 600 and the top plate are sealed, which can achieve the sealing between the outside and the upper tank 160 or the internal space of the compartment. At this time, the second sealing frame 400 rises, and the internal space of the compartment is connected to the inner cavity of the machine housing 100. The first worktable 210 can then smoothly transport the substrate to the screen printing mechanism.

[0031] The compartment has good sealing performance, reducing the risk of vacuum breakage within the housing 100. When the space inside the compartment is completely isolated from the outside and the housing 100, the air inside the compartment needs to be evacuated before connecting the compartment to the housing 100. Therefore, specifically, the compartment connection includes a vacuuming mechanism. The time required for vacuuming the compartment is generally short, having a very small impact on the working efficiency of the vacuum screen printing machine.

[0032] The vacuum screen printing machine also includes a second conveying mechanism 300 and a first lifting drive mechanism (not shown in the figure). The second conveying mechanism 300 is connected to the inner wall of the housing 100. The second conveying mechanism 300 and the first conveying mechanism 200 are parallel to each other. The second conveying mechanism 300 and the first conveying mechanism 200 are horizontally offset and located below the first conveying mechanism 200. The second conveying mechanism 300 is provided with a second worktable 310, which is used to carry another substrate. The second worktable 310 is also provided with a barrier 800 for surrounding the substrate. The upper surface of the barrier 800 is also provided with a first inclined surface 810. The first lifting drive mechanism is located inside the housing 100 and below the inlet and outlet. The first lifting drive mechanism can abut against the lower surface of the second worktable 310 to drive the second worktable 310 to rise and fall. The function of the barrier 800 on the second worktable 310 is the same as that of the barrier 800 on the first worktable 210. The function of the first inclined surface 810 on the second worktable 310 is the same as that of the first inclined surface 810 on the first worktable 210. In other words, the vacuum screen printing machine has a dual worktable structure.

[0033] The vacuum screen printing machine operates as follows: When the first worktable 210 is at one end of the first conveying mechanism 200, that is, when the first worktable 210 corresponds to the inlet and outlet, the lower end face of the second sealing frame 400 seals against the first worktable 210, and the upper end of the second sealing frame 400 forms a sealing cover at the lower end of the inlet and outlet or extends into the inlet and outlet. The cover plate 600, the top plate, the second sealing frame 400 and the first worktable 210 form a compartment for accommodating the printing substrate. The compartment is separated from the inner cavity of the machine housing 100. By opening the cover plate 600, the printing substrate can be placed on or taken off the first worktable 210. Open the cover plate 600, take out the printed substrate from the first worktable 210, then place the substrate to be printed on the first worktable 210, then close the cover plate 600, the cover plate 600 seals the entire inlet and outlet, the second sealing frame 400 rises and detaches from the first worktable 210, the first worktable 210 is then transported by the first conveying mechanism 200 to the other end of the first conveying mechanism 200, and the substrate to be printed on the first worktable 210 can then be printed by the screen printing mechanism.

[0034] Next, the second worktable 310 is conveyed by the second conveying mechanism 300 to one end of the second conveying mechanism 300, that is, the second worktable 310 corresponds to the inlet and outlet. The first lifting drive mechanism drives the second worktable 310 to rise and abut against the lower end of the second sealing frame 400. A seal is formed between the second worktable 310 and the second sealing frame 400. The cover plate 600, the top plate, the second sealing frame 400 and the second worktable 310 form a compartment for accommodating the printing substrate. The compartment is separated from the inner cavity. Open the cover plate 600 again, take out the printed substrate from the second worktable 310, and then place the substrate to be printed on the second worktable 310. Then close the cover plate 600, which seals the inlet and outlet. The second sealing frame 400 rises, and the first lifting drive mechanism drives the second worktable 310 to descend. The second worktable 310 detaches from the second sealing frame 400 and falls onto the second conveying mechanism 300. The second worktable 310 is conveyed by the second conveying mechanism 300 to the other end of the second conveying mechanism 300. After the substrate to be printed on the first worktable 210 is printed by the screen printing mechanism, the substrate to be printed on the second worktable 310 can be printed by the screen printing mechanism.

[0035] After the substrate to be printed on the first worktable 210 is printed by the screen printing mechanism, the first conveying mechanism 200 transports the first worktable 210 to one end of the first conveying mechanism 200. The first worktable 210 then aligns with the inlet / outlet, the second sealing frame 400 descends, and the lower end of the second sealing frame 400 seals against the first worktable 210 again. The upper end of the second sealing frame 400 again forms a sealing cover over the lower end of the inlet / outlet or extends into the inlet / outlet, so that the cover plate 600, the top plate, the second sealing frame 400, and the first worktable 210 once again form a compartment to accommodate the substrate. In this way, the first worktable 210 and the second worktable 310 alternately load and unload materials without affecting each other, making the loading and unloading efficiency of the vacuum screen printing machine higher, thereby improving the working efficiency of the vacuum screen printing machine. The formation of the compartment eliminates the need to break the vacuum in the inner cavity of the vacuum screen printing machine, saving energy and improving the working efficiency of the vacuum screen printing machine.

[0036] It is understood that the first conveying mechanism 200 includes two parallel first conveyor belts, and the two ends of the first worktable 210 are respectively connected to the two first conveyor belts. The two first conveyor belts drive the first worktable 210 to move. Specifically, the two first conveyor belts are connected to the same first drive mechanism, which drives the two first conveyor belts to rotate synchronously. The two ends of the first worktable 210 can be connected to the first conveyor belts by abutting against them, or by fasteners. A gap is formed between the two first conveyor belts.

[0037] It is understood that the second conveying mechanism 300 includes two parallel second conveyor belts, both positioned below and between the two first conveyor belts. The two ends of the second worktable 310 can be connected to the two second conveyor belts respectively, and the two second conveyor belts drive the second worktable 310 to move. The second worktable 310 can pass through the gap formed between the two first conveyor belts. Specifically, the two second conveyor belts are connected to the same second drive mechanism, which drives the two second conveyor belts to rotate synchronously. The two ends of the second worktable 310 can be connected to the second conveyor belts by abutting against them.

[0038] The first lifting drive mechanism is located below the two second conveyor belts. Its output end faces upwards and abuts against the lower surface of the second worktable 310. The first lifting drive mechanism drives the second worktable 310 to rise and fall. The first lifting drive mechanism can be a hydraulic cylinder or a pneumatic cylinder. Both the first and second drive mechanisms can be motors.

[0039] It is understood that a second lifting drive mechanism 120 is provided inside the housing 100. The output end of the second lifting drive mechanism 120 faces upward and is connected to the second sealing frame 400. The second sealing frame 400 is located above the first worktable 210. The second lifting drive mechanism 120 drives the second sealing frame 400 to rise or fall. It should be understood that there are multiple second lifting drive mechanisms 120, which are divided into two groups. The two groups of second lifting drive mechanisms 120 are respectively installed at both ends of the second sealing frame 400, thereby balancing the forces on both ends of the second sealing frame 400.

[0040] The second lifting drive mechanism 120 can be a hydraulic cylinder or a pneumatic cylinder. A guiding mechanism is also provided inside the housing 100. The guiding mechanism includes a cooperating guide rod and a guide block. Both the guide rod and the guide block are vertically arranged, meaning the guide rod is perpendicular to the plane where the inlet and outlet are located. One of the guide rod and the guide block is connected to the inner wall of the housing 100, and the other is connected to the second sealing frame 400. The guide rod and the guide block guide the second sealing frame 400, ensuring the direction of movement of the second sealing frame 400. It can be seen that the plane where the inlet and outlet are located is a horizontal plane, and the first conveying mechanism 200, the first worktable 210, the second conveying mechanism 300, and the second worktable 310 are all horizontally arranged. The first lifting drive mechanism, the second lifting drive mechanism 120, the guide rod, and the guide block are all vertically arranged.

[0041] It is understandable that pressure plates 430 are provided around the upper surface of the second sealing frame 400. The pressure plates 430 extend above the first sealing frame 161 to block the junction between the second sealing frame 400 and the first sealing frame 161, so as to prevent dust and other debris from entering the gap between the second sealing frame 400 and the first sealing frame 161.

[0042] Specifically, a first sealing ring 700 is provided on the upper surface of the first sealing frame 161. The first sealing ring 700 abuts against the inner wall of the upper groove 160 and the pressure plate 430. The first sealing ring 700 can prevent dust and other debris from entering the gap between the first sealing frame 161 and the inner wall of the upper groove 160. A fourth sealing ring 440 is provided on the bottom of the upper groove 160. The lower surface of the first sealing frame 161 abuts against the fourth sealing ring 440. The fourth sealing ring 440 can provide a good seal between the bottom of the upper groove 160 and the first sealing frame 161, preventing air from entering the gap between the bottom of the upper groove 160 and the first sealing frame 161 and the inner wall of the opening.

[0043] There are two fourth sealing rings 440. One of the fourth sealing rings 440 has a cuboid longitudinal section, and its three adjacent sides abut against the lower surface of the first sealing frame 161, the outer surface of the second sealing frame 400, and the bottom of the upper groove 160, respectively.

[0044] Understandably, the first workbench 210 includes a base plate 211 and a platform 212 mounted on the base plate 211. The base plate 211 is used to connect to or abut against the first conveying mechanism 200, and supports the platform 212, which is used to carry the printing substrate. The enclosure 800 is connected to the base plate 211 and encloses the platform 212. A fifth sealing ring 213 is provided between the enclosure 800 and the base plate 211, which provides a good seal between the base plate 211 and the enclosure 800.

[0045] It should be understood that the first sealing ring 700, the second sealing ring 420, the third sealing ring 900, the fourth sealing ring 440, and the fifth sealing ring 213 are all elastic. The first sealing frame 161 and the second sealing frame 400 are both square-shaped.

[0046] Understandably, the vacuum screen printing machine also includes a rotating shaft 500, which is rotatably mounted on the area of ​​the housing 100 near the inlet and outlet. The straight line of the rotating shaft 500 is parallel to the plane of the inlet and outlet. One end of the cover plate 600 is connected to the rotating shaft 500. The plane of the cover plate 600 is parallel to the straight line of the rotating shaft 500. The cover plate 600 can cover the upper end of the inlet and outlet. The cover plate 600, the top plate, the second sealing frame 400, and the first worktable 210 or the second worktable 310 form a compartment for accommodating the printing substrate.

[0047] Since the straight line of the rotating shaft 500 is parallel to the plane of the inlet and outlet, and one end of the cover plate 600 is connected to the rotating shaft 500, and the plane of the cover plate 600 is parallel to the straight line of the rotating shaft 500, the cover plate 600 can seal or open the inlet and outlet. The cover plate 600 is connected to the machine housing 100 via the rotating shaft 500, which can fully open the inlet and outlet, facilitating the passage of the substrate through the inlet and outlet.

[0048] Understandably, the housing 100 has a boss 110 in the area next to the inlet and outlet. The boss 110 is higher than the inlet and outlet, and a linear drive device 111 is hinged to the boss 110. (See [reference]) Figure 5 The output end of the linear drive device 111 is hinged with a first ear plate 112, which is connected to the rotating shaft 500. The linear drive device 111 drives the rotating shaft 500 to rotate on the housing 100 through the first ear plate 112, and the rotating shaft 500 drives the cover plate 600 to rotate.

[0049] The orthographic projection of the linear drive device 111 onto the plane of the inlet and outlet is located next to the inlet and outlet, and the first ear plate 112 forms an obtuse angle with the cover plate 600. Therefore, interference of the linear drive device 111 with the rotation of the cover plate 600 can be avoided, allowing the cover plate 600 to rotate at a larger angle. This prevents the inlet and outlet from being blocked by the linear drive device 111 and the cover plate 600, making it easier for the substrate to pass through the inlet and outlet, and improving the efficiency and convenience of loading and unloading the screen printing machine.

[0050] It should be understood that the linear drive device 111 is connected to the mounting plate 113 via a first hinge pin, and the mounting plate 113 is connected to the upper end of the boss 110. The linear drive device 111 can be a cylinder or a hydraulic cylinder. The first ear plate 112 has a certain length, one end of the first ear plate 112 is hinged to the output end of the linear drive device 111 via a second hinge pin, and the other end of the first ear plate 112 is fixedly connected to the rotating shaft 500. One end of the cover plate 600 is fixedly connected to the rotating shaft 500. The first ear plate 112, the rotating shaft 500, and the cover plate 600 form a lever structure. The included angle between the first ear plate 112 and the cover plate 600 is between 90° and 150°.

[0051] It is known that the fixed end of the linear drive device 111 is the upper end, and the fixed end of the linear drive device 111 is connected to the mounting plate 113. The driving end of the linear drive device 111 is the lower end, and the driving end of the linear drive device 111 is hinged to the first ear plate 112.

[0052] There are two linear drive units 111 and two first ear plates 112. The two linear drive units 111 are connected to the upper end of the boss 110 through the same mounting plate 113. One linear drive unit 111 is connected to one end of the rotating shaft 500 through one first ear plate 112, and the other linear drive unit 111 is connected to the other end of the rotating shaft 500 through another first ear plate 112. The arrangement of two linear drive units 111 and two first ear plates 112 ensures that the two ends of the rotating shaft 500 are subjected to balanced forces.

[0053] It is understandable that the rotating shaft 500 is connected to the cover plate 600 via the second ear plate 510, which acts as an intermediate connection between the rotating shaft 500 and the cover plate 600. There is a gap between the side of the cover plate 600 near the rotating shaft 500 and the rotating shaft 500, meaning that the cover plate 600 and the rotating shaft 500 are not on the same plane. When the cover plate 600 is attached to the housing 100 to seal the inlet and outlet, the rotating shaft 500 does not need to be attached to the top plate of the housing 100, thus allowing for more options in the installation method and position of the rotating shaft 500. Specifically, the gap between the side of the cover plate 600 near the rotating shaft 500 and the rotating shaft 500 can be less than or equal to 70mm, but the value of the gap can also be chosen according to the actual situation.

[0054] The second ear plate 510 includes a first segment and a second segment that are perpendicular to each other. The first segment and the second segment are connected to the rotating shaft 500 and the cover plate 600, respectively. Since the first segment and the second segment are perpendicular to each other, it ensures that the cover plate 600 and the rotating shaft 500 are not on the same plane. The lengths of the first segment and the second segment can be determined according to the actual installation situation, but it is necessary to ensure that the length of the first segment is not too small, thereby ensuring that the cover plate 600 and the rotating shaft 500 are not on the same plane, that is, ensuring that there is a gap between the side of the cover plate 600 near the rotating shaft 500 and the rotating shaft 500.

[0055] There are two second ear plates 510. One end of one second ear plate 510 is connected to one end of the rotating shaft 500, and the other end of the other second ear plate 510 is connected to the other end of the rotating shaft 500. The other two second ear plates 510 are connected to the other end of the rotating shaft 500. The arrangement of two second ear plates 510 makes the connection structure between the rotating shaft 500 and the cover plate 600 stronger, and also makes the forces on both ends of the rotating shaft 500 and the cover plate 600 more balanced.

[0056] Understandably, the housing 100 is provided with two bearing seats 130, and the rotating shaft 500 is connected to the housing 100 through the two bearing seats 130. This ensures that both ends of the rotating shaft 500 are supported, thereby balancing the forces on both ends of the rotating shaft 500 and increasing the structural strength of the rotating shaft 500.

[0057] Understandably, the housing 100 is equipped with a damping clutch 140, the movable end of which is connected to the rotating shaft 500 for transmission. The damping clutch 140 has the function of reducing the rotational speed of the rotating shaft 500, thus enabling the cover plate 600 to open and close slowly.

[0058] It is understandable that the housing 100 is equipped with an encoder 150, and the encoder disk of the encoder 150 is connected to the rotating shaft 500. The encoder 150 can be used to determine the rotation angle of the rotating shaft 500, thereby facilitating other devices or systems to obtain the position information of the cover plate 600.

[0059] Understandably, the cover plate 600 has a sealing gasket 610 on its side, which abuts against the inner wall of the inlet and outlet. The sealing gasket 610 seals the inlet and outlet, further ensuring their airtightness. The sealing gasket 610 also reduces the volume of the compartment, improving the efficiency of vacuuming the compartment.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A vacuum screen printing machine, characterized in that, include: The machine housing has a stepped inlet and outlet on its top plate. The inlet and outlet include an upper groove and a lower through-hole that are coaxial and connected. The length and width of the upper groove are larger than those of the lower through-hole. The bottom of the upper groove is provided with a first sealing frame. A first conveying mechanism is connected to the inner wall of the machine housing. One end of the first conveying mechanism is located below the inlet and outlet, and the other end of the first conveying mechanism is located below the screen printing mechanism. A first worktable is provided on the first conveying mechanism. The first worktable is used to carry the printing substrate. The first worktable is provided with a barrier for surrounding the printing substrate. The upper surface of the barrier is provided with a first inclined surface. A liftable second sealing frame is provided, which passes through the opening formed by the lower passage and the first sealing frame. A second sealing ring is provided between the outer wall of the second sealing frame and the side wall of the opening. The lower surface of the second sealing frame is provided with a second inclined surface that matches the first inclined surface. The third sealing ring is disposed on the second sealing frame or the enclosure, and the third sealing ring is located between the first inclined surface and the second inclined surface; A cover plate that can seal and cover the upper groove, the cover plate, the top plate, the second sealing frame and the first worktable form a compartment for accommodating the printing substrate.

2. The vacuum screen printing machine according to claim 1, characterized in that: It also includes a second conveying mechanism and a first lifting drive mechanism. The second conveying mechanism is connected to the inner wall of the housing. The second conveying mechanism is parallel to the first conveying mechanism and is horizontally offset from the first conveying mechanism and located below the first conveying mechanism. The second conveying mechanism is provided with a second worktable for carrying another printing substrate. The second worktable is also provided with a barrier for surrounding the printing substrate. The upper surface of the barrier is also provided with a first inclined surface. The first lifting drive mechanism is located inside the housing and below the inlet / outlet. The first lifting drive mechanism can abut against the lower surface of the second worktable to drive the second worktable to rise and fall. The cover plate can seal and cover the upper groove. The cover plate, the top plate, the second sealing frame and the second worktable form a compartment for accommodating the printing substrate.

3. The vacuum screen printing machine according to claim 2, characterized in that: The first conveying mechanism includes two parallel first conveyor belts, and the two ends of the first workbench are respectively connected to the two first conveyor belts.

4. The vacuum screen printing machine according to claim 3, characterized in that: The second conveying mechanism includes two parallel second conveyor belts, both of which are located below the two first conveyor belts. The two ends of the second worktable can be connected to the two second conveyor belts respectively. The first lifting drive mechanism is located below the two second conveyor belts, and the output end of the first lifting drive mechanism faces upward and can abut against the lower surface of the second worktable.

5. The vacuum screen printing machine according to claim 1, characterized in that: The upper surface of the second sealing frame is provided with pressure plates around its perimeter. The pressure plates extend above the first sealing frame to block the intersection between the second sealing frame and the first sealing frame.

6. The vacuum screen printing machine according to claim 1, characterized in that: The first workbench includes a base plate and a platform plate disposed on the base plate. The enclosure is connected to the base plate and surrounds the platform plate. The platform plate is used to support the printing substrate.

7. The vacuum screen printing machine according to claim 1, characterized in that: It also includes a rotating shaft, which is rotatably disposed on the housing near the inlet and outlet. The straight line of the rotating shaft is parallel to the plane of the inlet and outlet. One end of the cover plate is connected to the rotating shaft, and the plane of the cover plate is parallel to the straight line of the rotating shaft.

8. The vacuum screen printing machine according to claim 7, characterized in that: The housing has a boss in the area next to the inlet and outlet. A linear drive device is hinged to the boss. The orthographic projection of the linear drive device onto the plane where the inlet and outlet are located is next to the inlet and outlet. The output end of the linear drive device is hinged to a first ear plate. The first ear plate is connected to the rotating shaft. The first ear plate forms an obtuse angle with the cover plate.

9. The vacuum screen printing machine according to claim 8, characterized in that: The linear drive device is of two types, and the first ear plate is of two types. One linear drive device is connected to one end of the rotating shaft through one of the first ear plates, and the other linear drive device is connected to the other end of the rotating shaft through the other first ear plate.

10. The vacuum screen printing machine according to claim 1, characterized in that: The housing is equipped with a second lifting drive mechanism. The output end of the second lifting drive mechanism faces upward and is connected to the second sealing frame. The second sealing frame is located above the first worktable.

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