Positioning jig for screen printing and screen printing equipment

Abstract

The utility model provides a positioning jig for screen printing and screen printing equipment. The positioning jig for silk-screen printing comprises a jig body, a positioning groove is formed in the jig body, and the positioning groove is used for containing a piece to be printed; and the adsorption part comprises an adsorption piece and a control piece, the adsorption piece is provided with an adsorption opening, the adsorption opening communicates with the interior of the positioning groove, the control piece is used for controlling the adsorption opening to be in a vacuum state for fixing the to-be-printed piece or a vacuum breaking state for releasing the to-be-printed piece, and the control piece is constructed to be in control connection with a control system of the screen printing equipment. According to the technical scheme, the problems that a jig of the automatic silk-screen equipment is difficult to automatically adsorb a printed object and is difficult to automatically remove adsorption are solved.

Description

Technical Field

[0001] This utility model relates to the field of screen printing technology, and more specifically, to a positioning fixture and screen printing equipment for screen printing. Background Technology

[0002] Screen printing is a common printing technique widely used for printing on various materials and products, including but not limited to paper, fabric, plastic, metal, glass, and ceramics. Its basic principle is to use a screen as a printing template, controlling the ink flow by utilizing the different sizes of the mesh openings. The ink is scraped onto the screen, and pressure is applied to the surface of the object through the screen, thus transferring the ink onto the surface to form the corresponding pattern or text.

[0003] Most existing positioning fixtures rely on the structure of the object being printed for positioning. After screen printing, the object needs to be held in place by its own weight, rather than being stuck to the screen by the tension of the ink liquid. When the object is light and the screen printing area is large (with high tension), the object is easily stuck to the screen, causing screen printing to shift and increasing the defect rate of the printed object in the production process.

[0004] To address this issue, Chinese patent CN 207449366 U proposes using a vacuum generator to create negative pressure to adsorb flat parts that need to be screen-printed, fixing the product onto a fixture. Then, an airflow regulating valve is used to adjust the airflow to adjust the adsorption force generated by the vacuum generator, making the adsorption force greater than the adhesion force of the ink on the screen printing stencil. This avoids the product adhering to the screen printing stencil. However, the above technology is an improvement made for manual screen printing equipment. For automatic screen printing equipment, the fixture is difficult to automatically adsorb the printed material, and after adsorption, it is also difficult to automatically release the adsorption, making it difficult to remove the printed material from the fixture. Utility Model Content

[0005] The main objective of this invention is to provide a positioning fixture and screen printing equipment for screen printing, so as to solve the problems in the prior art of automatic screen printing equipment where the fixture is difficult to automatically adsorb the printed material and difficult to automatically release the adsorption.

[0006] To achieve the above objectives, this utility model provides a positioning fixture for screen printing. The positioning fixture includes a fixture body with a positioning groove for placing the workpiece to be printed; and an adsorption part including an adsorption element and a control element. The adsorption element has an adsorption port that communicates with the interior of the positioning groove. The control element controls the adsorption port to be in a vacuum state that fixes the workpiece to be printed or to be in a vacuum-breaking state that releases the workpiece to be printed. The control element is configured to be connected to the control system of the screen printing equipment.

[0007] Furthermore, the adsorption unit also includes: a first pipeline connected to the inlet of the adsorption element; a vacuum generating element disposed on the first pipeline; and a control element disposed on the first pipeline for controlling the on / off state of the first pipeline.

[0008] Furthermore, the adsorption unit also includes: an air source for generating compressed air, one end of the first pipeline being connected to the air source and the other end of the first pipeline being connected to the inlet of the adsorption element; and a vacuum generator located between the control element and the adsorption element.

[0009] Furthermore, the adsorption component includes a main pipe and multiple branch pipes connected to one end of the main pipe, the other end of the main pipe being connected to the first pipeline, and the outlet of each branch pipe forming an adsorption port.

[0010] Furthermore, each branch pipe includes a connecting pipe, one end of which is connected to the main pipe; a connector, one end of which is connected to the other end of the connecting pipe; and a suction cup, one end of which is connected to the other end of the connector, with the other end of the suction cup forming the outlet of the branch pipe.

[0011] Furthermore, the fixture body includes two support members, which are spaced apart; a positioning member is mounted on the two support members, and the positioning member is provided with a positioning groove and multiple clearance through holes communicating with the positioning groove; the main pipe is located between the two support members, and multiple branch pipes extend into the multiple clearance through holes respectively.

[0012] Furthermore, the control component is a first solenoid valve.

[0013] According to another aspect of the present invention, a screen printing device is provided. The screen printing device includes a frame; the aforementioned screen printing positioning fixture; a printing section having a printing end; and a control system including a controller and a drive component electrically connected to the controller. The drive component is used to drive the printing end to move closer to or further away from the screen printing positioning fixture, and the controller is electrically connected to the drive component.

[0014] Furthermore, the driving component includes: a cylinder having two air inlets, the driving end of the cylinder being connected to the printing end; a second solenoid valve having an air inlet and two air outlets, the air inlet being selectively connected to one of the two air outlets, the second solenoid valve being electrically connected to a control component; a second pipeline, one end of the second pipeline being connected to an air source, and the other end of the second pipeline being connected to the air inlet; and two third pipelines, the two third pipelines being respectively connected to the two air outlets, and the two third pipelines being respectively connected to the two air inlets of the cylinder.

[0015] Furthermore, the screen printing equipment also includes a main pipe and a tee connector. One end of the main pipe is connected to the air source, the other end of the main pipe is connected to the first end of the tee connector, the second end of the tee connector is connected to the first pipeline of the adsorption section, and the third end of the tee connector is connected to the second pipeline.

[0016] By applying the technical solution of this utility model, a control component is set up and connected to the control system of the screen printing equipment. This control component can switch the suction port between a vacuum state that fixes the workpiece to be printed and a vacuum-breaking state that releases the workpiece. When the control system sends a screen printing signal, the control component controls the suction port to be in the vacuum state that fixes the workpiece to be printed. The suction port can then adsorb the workpiece to be printed onto the fixture body. This avoids the phenomenon of separation between the fixture body and the workpiece due to a large screen printing area. This is especially beneficial when the workpiece is lightweight or the screen printing area is large. The ink tension causes displacement of the workpiece to be printed, thus ensuring accurate positioning of the screen-printed pattern. When the control system sends a stop screen printing signal, the controller switches the suction port from a vacuum state to a de-vacuum state, separating the fixture body from the workpiece to be printed, making it easier to remove the workpiece from the fixture body and improving operational convenience. In this way, the controller can be linked with the control system of the screen printing equipment. When the control system sends a screen printing signal, the workpiece to be printed can be adsorbed onto the fixture body; when the control system sends a stop screen printing signal, the workpiece to be printed can be detached from the fixture body. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of an embodiment of the screen printing equipment of this utility model is shown (wherein, the printing part is not shown);

[0019] Figure 2 A schematic diagram of an embodiment of the positioning fixture for screen printing of this utility model is shown (wherein, a second solenoid valve is shown);

[0020] Figure 3 It shows Figure 2 A perspective view of the positioning fixture used for screen printing;

[0021] Figure 4 It shows Figure 2 A schematic diagram of the positioning fixture used for screen printing;

[0022] Figure 5 It shows Figure 2 A cross-sectional view of the positioning component of the positioning fixture used for screen printing.

[0023] The above figures include the following reference numerals:

[0024] 10. Frame; 4. Adsorption component; 20. Fixture body; 21. Support component; 22. Positioning component; 30. Part to be printed; 40. Vacuum generating component; 41. Suction cup; 42. Connector; 43. Connecting pipe; 50. Control component; 60. Second solenoid valve; 70. First pipeline; 80. Main pipe; 90. Second pipeline; 91. T-connector. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] like Figures 2 to 5 As shown, an embodiment of this utility model provides a positioning fixture for screen printing. The positioning fixture for screen printing includes a fixture body 20, on which a positioning groove is provided for placing the workpiece 30 to be printed; and an adsorption part, including an adsorption member 4 and a control member 50. The adsorption member 4 has an adsorption port that communicates with the interior of the positioning groove. The control member 50 is used to control the adsorption port to be in a vacuum state that fixes the workpiece 30 to be printed or to release the workpiece 30 from the vacuum state. The control member 50 is configured to be connected to the control system of the screen printing equipment.

[0027] In the above technical solution, by setting a control component 50 and connecting it to the control system of the screen printing equipment, the control component 50 can control the suction port to switch between a vacuum state that fixes the workpiece 30 to be printed and a vacuum-breaking state that releases the workpiece 30 to be printed. When the control system sends a screen printing signal, the control component 50 controls the suction port to be in a vacuum state that fixes the workpiece 30 to be printed, so that the suction port can adsorb the workpiece 30 to be printed onto the fixture body 20. This avoids the phenomenon of separation between the fixture body 20 and the workpiece 30 due to a large screen printing area. When the workpiece 30 to be printed is lightweight or the screen printing area is large, it can avoid the separation caused by the workpiece 30 being lightweight or the screen printing area being large. The displacement of the printable part 30 due to ink tension ensures accurate positioning of the screen-printed pattern. When the control system sends a stop screen printing signal, the control unit 50 switches the suction port from a vacuum state to a de-vacuum state, separating the fixture body 20 and the printable part 30 to facilitate removal of the printable part 30 from the fixture body 20, thus improving operational convenience. In this way, the control unit 50 can be linked with the control system of the screen printing equipment. When the control system sends a screen printing signal, the printable part 30 can be adsorbed onto the fixture body 20; when the control system sends a stop screen printing signal, the printable part 30 can detach from the fixture body 20.

[0028] Specifically, in the embodiments of this utility model, the part to be printed 30 is a shell.

[0029] Specifically, in the embodiments of this utility model, the positioning groove on the fixture body 20 provides a precise placement position for the workpiece 30 to be printed, ensuring positioning accuracy during the screen printing process.

[0030] Specifically, in the embodiments of this utility model, the vacuum breaking state refers to the process of introducing external air or other gases into a system that was originally in a vacuum or negative pressure state, so that the pressure inside the system is restored to the same as the external environmental pressure, i.e., the standard atmospheric pressure state.

[0031] like Figures 1 to 4 As shown in the embodiment of this utility model, the adsorption part further includes a first pipeline 70, which is connected to the inlet of the adsorption member 4; a vacuum generating member 40 is disposed on the first pipeline 70; and a control member 50 is disposed on the first pipeline 70. The control member 50 is used to control the opening and closing of the first pipeline 70.

[0032] In the above technical solution, the first pipeline 70 can be opened or closed by controlling the control component 50. When the first pipeline 70 is in the open state, the vacuum generating component 40 generates a vacuum, so that the suction port is in a vacuum state. In this way, the suction port can adsorb the workpiece 30 to be printed onto the fixture body 20, thereby ensuring the accurate position of the screen-printed pattern during the screen printing process. When the first pipeline 70 is in the closed state, the vacuum generating component 40 no longer generates a vacuum, the suction port changes from a vacuum state to a broken vacuum state, and the fixture body 20 and the workpiece 30 to be printed are separated, so that the workpiece 30 to be printed can be removed from the fixture body 20, thereby improving the convenience of operation.

[0033] like Figures 1 to 4 As shown in the embodiment of this utility model, the adsorption unit further includes an air source for generating compressed air, one end of the first pipeline 70 is connected to the air source, and the other end of the first pipeline 70 is connected to the inlet of the adsorption element; the vacuum generating element 40 is located between the control element 50 and the adsorption element 4, and the vacuum generating element 40 is a vacuum generator.

[0034] In the above technical solution, when the first pipe 70 is in the open state, compressed air enters the vacuum generating unit 40 through the first pipe 70 to generate a vacuum, so that the suction port is in a vacuum state. In this way, the suction port can adsorb the workpiece 30 to be printed onto the fixture body 20, thereby ensuring the accurate positioning of the screen-printed pattern during the screen printing process. When the first pipe 70 is in the closed state, compressed air cannot enter the vacuum generating unit 40 through the first pipe 70. In this way, the vacuum generating unit 40 cannot generate a vacuum, and the suction port changes from a vacuum state to a broken vacuum state. The fixture body 20 and the workpiece 30 to be printed are separated, so that the workpiece 30 to be printed can be removed from the fixture body 20, thereby improving the convenience of operation.

[0035] Specifically, in the embodiments of this utility model, the vacuum generator can generate a stable vacuum force to ensure that the workpiece 30 to be printed is adsorbed on the fixture body 20 during the screen printing process, preventing the workpiece 30 to be printed from shifting, thereby improving the screen printing quality; at the same time, the vacuum breaking state allows the workpiece 30 to be printed to be safely and without damage removed from the fixture body 20.

[0036] Specifically, in the embodiments of this utility model, the specific structure of the vacuum generator can be referred to the prior art, and will not be repeated here.

[0037] In one embodiment, the vacuum generating element 40 can be a vacuum pump.

[0038] like Figures 1 to 3 As shown in the embodiment of this utility model, the adsorption element 4 includes a main pipe and a plurality of branch pipes connected to one end of the main pipe. The other end of the main pipe is connected to the first pipeline 70, and the outlet of each branch pipe forms an adsorption port.

[0039] In the above technical solution, when the first pipeline 70 is in the open state, compressed air enters the vacuum generating unit 40 through the first pipeline 70 to generate a vacuum. The vacuum air enters the suction port through the main pipe and multiple branch pipes to make the suction port a vacuum state. In this way, the suction port can adsorb the workpiece 30 to be printed onto the fixture body 20, thereby ensuring the accurate positioning of the screen-printed pattern during the screen printing process. When the first pipeline 70 is in the closed state, the vacuum generating unit 40 cannot generate a vacuum, and the suction port changes from a vacuum state to a broken vacuum state. The fixture body 20 and the workpiece 30 to be printed are separated, so that the workpiece 30 to be printed can be removed from the fixture body 20, thereby improving the convenience of operation.

[0040] Specifically, in the embodiments of this utility model, by setting a main pipe and multiple branch pipes connected to the main pipe, it can be ensured that the vacuum force is evenly distributed on all the adsorption ports. This design avoids the phenomenon of unstable adsorption of the workpiece 30 due to uneven pressure at a single adsorption port, thereby improving the stability of the screen printing process and the positioning accuracy of the workpiece 30.

[0041] Preferably, in an embodiment of this utility model, there are two branch pipes, and the main pipe and the two branch pipes are connected by a tee connector.

[0042] like Figure 3 As shown in the embodiment of this utility model, each branch pipe includes a connecting pipe 43, one end of which is connected to the main pipe; a connector 42, one end of which is connected to the other end of the connecting pipe 43; and a suction cup 41, one end of which is connected to the other end of the connector 42, and the other end of the suction cup 41 forms the outlet of the branch pipe.

[0043] In the above technical solution, when the first pipeline 70 is in the open state, compressed air enters the vacuum generating unit 40 through the first pipeline 70 to generate a vacuum. The vacuum air enters the suction cup 41 through the main pipe, the connecting pipe 43, and the connector 42, so that the suction port is in a vacuum state. In this way, the suction port can adsorb the workpiece 30 to be printed onto the fixture body 20, thereby ensuring the accurate position of the screen printing pattern during the screen printing process.

[0044] Specifically, in the embodiments of this utility model, the connector 42 has a gas flow channel inside, and vacuum air enters the suction cup 41 through the gas flow channel via the connecting pipe 43.

[0045] like Figures 1 to 5 As shown in the embodiment of this utility model, the fixture body 20 includes two support members 21, which are spaced apart; a positioning member 22 is mounted on the two support members 21, and the positioning member 22 is provided with a positioning groove and a plurality of clearance through holes communicating with the positioning groove. The main pipe is located between the two support members 21, and the plurality of branch pipes extend into the plurality of clearance through holes respectively.

[0046] In the above technical solution, on the one hand, the positioning groove on the positioning member 22 can accurately match the contour of the workpiece 30 to be printed, so as to ensure the accurate position of the workpiece 30 to be printed during the screen printing process; on the other hand, the two support members 21 can support the positioning member 22, thereby enhancing the structural stability of the fixture body 20; furthermore, the design of avoiding through holes allows the branch tube to extend into the positioning member 22, so that the suction port formed by the suction cup 41 can directly contact the workpiece 30 to be printed, ensuring that the vacuum suction force is uniform and directly acts on the workpiece 30 to be printed, thus improving the stability of the suction.

[0047] Specifically, in the embodiments of this utility model, the size of the clearance through hole is equal to the size of the suction cup 41.

[0048] like Figure 1 and Figure 2 As shown, in an embodiment of this utility model, the control component 50 is a first solenoid valve.

[0049] In the above technical solution, by setting a first solenoid valve, the opening or closing of the first pipeline 70 can be controlled so that the adsorption port switches between a vacuum state and a vacuum breaking state.

[0050] Specifically, in the embodiments of this utility model, when the first solenoid valve receives a control signal (provided by the control system of the screen printing equipment), the solenoid coil is energized to generate an electromagnetic field. The electromagnetic force generated by the solenoid coil will attract the valve core to move, so as to open the first pipeline 70. When the solenoid coil is de-energized, the electromagnetic force disappears, and the valve core returns to its original position under the action of spring force or other mechanical force, so as to close the first pipeline 70.

[0051] like Figure 1 and Figure 2 As shown, this utility model provides a screen printing device. The screen printing device includes a frame 10; the aforementioned screen printing positioning fixture; a printing section having a printing end; and a control system including a controller and a drive component electrically connected to the controller. The drive component is used to drive the printing end to move closer to or away from the screen printing positioning fixture, and the control component 50 is electrically connected to the drive component.

[0052] In the above technical solution, the controller enables the drive component to control the printing end and the control component 50. The drive component drives the printing end to move closer to or further away from the screen printing positioning fixture. By controlling the control component 50, the first pipeline 70 can be opened or closed. When the first pipeline 70 is open, the vacuum generator 40 generates a vacuum, so that the suction port is in a vacuum state. In this way, the suction port can adsorb the workpiece 30 to be printed onto the fixture body 20, thereby ensuring the accurate positioning of the screen printing pattern during the screen printing process. When the first pipeline 70 is closed, the vacuum generator 40 no longer generates a vacuum, the suction port changes from a vacuum state to a broken vacuum state, and the fixture body 20 and the workpiece 30 to be printed separate, so that the workpiece 30 to be printed can be removed from the fixture body 20, thereby improving the convenience of operation.

[0053] Specifically, in this embodiment of the invention, the controller is a computer, and the control process of the screen printing equipment is as follows: the controller sends a signal to start screen printing. Since the controller and the drive component are electrically connected, the drive component can drive the printing end to move towards the positioning fixture for screen printing. At the same time, the drive component can control the control element 50, which controls the first pipeline 70 to keep the first pipeline 70 in an open state. Compressed air enters the vacuum generating element 40 through the first pipeline 70 to generate a vacuum, and then enters the suction cup 41 through the main pipe and multiple branch pipes. Thus, the suction port is in a vacuum state. After the screen printing of the workpiece 30 is completed, the controller sends a signal to stop screen printing. Since the controller and the drive component are electrically connected, the drive component can drive the printing end to move away from the positioning fixture for screen printing. At the same time, the drive component can control the control component 50, which controls the first pipeline 70 to keep the first pipeline 70 in a closed state. The vacuum generating component 40 cannot generate a vacuum, and the suction port changes from a vacuum state to a vacuum breaking state. The fixture body 20 and the workpiece 30 to be printed are separated. In this way, the workpiece 30 to be printed can be removed from the fixture body 20, thereby improving the convenience of operation.

[0054] Specifically, in the embodiments of this utility model, the fixture body 20 also includes a base plate, one end of which is fixedly connected to the frame 10, and the other end of which is fixedly connected to two support members 21.

[0055] Specifically, in an embodiment of this utility model, the printing section includes a screen, which forms the printing end.

[0056] like Figure 1 and Figure 2 As shown in the embodiment of this utility model, the driving component includes a cylinder with two air inlets, the driving end of the cylinder being connected to the printing end; a second solenoid valve 60 with an air inlet and two air outlets, the air inlet being selectively connected to one of the two air outlets, the second solenoid valve 60 being electrically connected to the control component 50; a second pipeline 90, one end of the second pipeline 90 being connected to an air source, and the other end of the second pipeline 90 being connected to the air inlet; and two third pipelines, the two third pipelines being respectively connected to the two air outlets, and the two third pipelines being respectively connected to the two air inlets of the cylinder.

[0057] In the above technical solution, by controlling the second solenoid valve 60, which controls one of the two third pipelines to connect with the second pipeline 90, compressed air enters one of the cylinder's air inlets through the second pipeline 90 and one of the two third pipelines, causing the printing end to move closer to the workpiece 30 to be printed. Simultaneously, the second solenoid valve 60 controls the control element 50, which in turn controls the first pipeline 70, keeping it open. Compressed air enters the vacuum generating element 40 through the first pipeline 70, creating a vacuum, and then enters the suction cup 41 through the main pipe and multiple branch pipes. This creates a vacuum at the suction port, thus completing the screen printing on the workpiece 30. After screen printing is completed... The controller sends a signal to stop screen printing. The second solenoid valve 60 controls another of the two third pipelines, connecting it to the second pipeline 90. In this way, compressed air enters the other air inlet of the cylinder through the second pipeline 90 and the other of the two third pipelines, causing the printing end to move away from the workpiece 30 to be printed. At the same time, the second solenoid valve 60 controls the control element 50, which in turn controls the first pipeline 70, so that the first pipeline 70 is closed. The vacuum generating element 40 cannot generate a vacuum, and the suction port changes from a vacuum state to a vacuum breaking state. The fixture body 20 and the workpiece 30 to be printed separate, so that the workpiece 30 to be printed can be removed from the fixture body 20, thereby improving the convenience of operation.

[0058] Specifically, in this embodiment of the invention, the cylinder includes a cylinder barrel and a piston. Two air inlets are respectively located at both ends of the cylinder barrel, and the piston is located inside the cylinder barrel. When the screen printing equipment sends a screen printing signal, the valve core of the second solenoid valve 60 is moved by controlling the second solenoid valve 60. This allows the second pipeline 90 to connect with the first of the two third pipelines. Compressed air enters the first air inlet of the cylinder through the second pipeline 90 and the first of the two third pipelines, thereby pushing the piston to move. This causes the printing end to move closer to the workpiece 30 to be printed. The gas in the cylinder exits through the second of the two air outlets. The air outlet is discharged through the second of the two third pipes; when the screen printing is completed, the controller sends a signal to stop screen printing, and controls the second solenoid valve 60 to move the valve core of the second solenoid valve 60. In this way, the second of the two third pipes can be connected to the second pipe 90. Compressed air enters the second air inlet of the cylinder through the second pipe 90 and the second of the two third pipes to push the piston to move. In this way, the printing end can be moved away from the workpiece 30 to be printed. The gas in the cylinder is discharged from the first of the two air outlets through the first of the two third pipes.

[0059] like Figure 1 and Figure 2 As shown in the embodiment of this utility model, the screen printing equipment further includes a main pipe 80 and a three-way connector 91. One end of the main pipe 80 is connected to the air source, the other end of the main pipe 80 is connected to the first end of the three-way connector 91, the second end of the three-way connector 91 is connected to the first pipeline 70 of the adsorption section, and the third end of the three-way connector 91 is connected to the second pipeline 90.

[0060] In the above technical solution, compressed air flows from the air source through the main pipe 80 to the tee connector 91. The compressed air flows from the first end to the second end of the tee connector 91. When vacuum adsorption is required (i.e., when the control component 50 is working), the compressed air enters the vacuum generating component 40 through the first pipe 70 to generate a vacuum, and then enters the suction cup 41 through the main pipe and multiple branch pipes. In this way, the adsorption port is in a vacuum state. When it is necessary to drive the printing end to move, the compressed air flows from the first end to the third end of the tee connector 91, and then distributes the compressed air to the air inlet of the cylinder through the second pipe 90, the second solenoid valve 60 and the third pipe, thereby realizing precise control of the printing end.

[0061] Specifically, in the embodiments of this utility model, this solution enables the vacuum generator to generate negative pressure during the screen printing process, adsorbing the workpiece 30 to be printed onto the fixture body 20. After the screen printing operation is completed, the generation of negative pressure stops (the adsorption of the workpiece 30 is canceled), reducing the likelihood of the workpiece 30 being easily stuck to the screen and causing screen printing displacement, thereby reducing the defect rate of products in the production process. This solution can link the operation of the vacuum generator with the control system of the screen printing equipment, realizing that the vacuum generator works fully automatically during the screen printing process, and the adsorption operation automatically stops after the screen printing is completed, without affecting the efficiency of removing the workpiece 30.

[0062] Specifically, in the embodiments of this utility model, this design concept can also be applied to non-planar products that are easily stuck to the screen by the screen and thus cause screen printing displacement. This design concept can also be applied to other processes that are not screen printing processes but also have similar problems in the production process.

[0063] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: By setting a control component, and the control component being connected to the control system of the screen printing equipment, the control component can control the suction port to switch between a vacuum state that fixes the workpiece to be printed and a vacuum-breaking state that releases the workpiece to be printed. When the control system sends a screen printing signal, the control component controls the suction port to be in a vacuum state that fixes the workpiece to be printed, and the suction port can adsorb the workpiece to be printed onto the fixture body. In this way, the phenomenon of separation between the fixture body and the workpiece to be printed due to a large screen printing area can be avoided. When the workpiece to be printed is relatively light or the screen printing area is large, the suction port can also achieve the following effects: When the printing area is large, it can avoid the displacement of the workpiece due to ink tension, thus ensuring the accurate positioning of the screen-printed pattern. When the control system sends a signal to stop screen printing, the controller switches the suction port from a vacuum state to a de-vacuum state, separating the fixture body from the workpiece to be printed, so that the workpiece can be removed from the fixture body, improving the convenience of operation. In this way, the controller can be linked with the control system of the screen printing equipment. When the control system sends a screen printing signal, the workpiece can be adsorbed on the fixture body; when the control system sends a signal to stop screen printing, the workpiece can be detached from the fixture body.

[0064] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A positioning fixture for screen printing, characterized in that, include: The fixture body (20) is provided with a positioning groove, which is used to place the workpiece (30) to be printed; The adsorption unit includes an adsorption element (4) and a control element (50). The adsorption element (4) has an adsorption port that is connected to the interior of the positioning groove. The control element (50) is used to control the adsorption port to be in a vacuum state that fixes the workpiece to be printed (30) or to release the workpiece to be printed (30) in a vacuum-breaking state. The control element (50) is configured to be connected to the control system of the screen printing equipment.

2. The positioning fixture for screen printing according to claim 1, characterized in that, The adsorption section further includes: The first pipeline (70) is connected to the inlet of the adsorption element (4); A vacuum generating element (40) is disposed on the first pipeline (70), and a control element (50) is disposed on the first pipeline (70). The control element (50) is used to control the on / off state of the first pipeline (70).

3. The positioning fixture for screen printing according to claim 2, characterized in that, The adsorption section further includes: An air source is used to generate compressed air. One end of the first pipe (70) is connected to the air source, and the other end of the first pipe (70) is connected to the inlet of the adsorption element. A vacuum generating element (40) is located between the control element (50) and the adsorption element (4), and the vacuum generating element (40) is a vacuum generator.

4. The positioning fixture for screen printing according to claim 2, characterized in that, The adsorption component (4) includes a main pipe and a plurality of branch pipes connected to one end of the main pipe. The other end of the main pipe is connected to the first pipeline (70), and the outlet of each branch pipe forms the adsorption port.

5. The positioning fixture for screen printing according to claim 4, characterized in that, Each of the aforementioned branch pipes includes: A connecting pipe (43), one end of which is connected to the main pipe; A connector (42), one end of which is connected to the other end of the connecting pipe (43); A suction cup (41) is provided, one end of which is connected to the other end of the connector (42), and the other end of the suction cup (41) forms the outlet of the branch pipe.

6. The positioning fixture for screen printing according to claim 4, characterized in that, The fixture body (20) includes: Two support members (21) are provided at intervals; The positioning component (22) is mounted on the two support components (21). The positioning component (22) is provided with the positioning groove and a plurality of clearance through holes communicating with the positioning groove. The main pipe is located between the two support components (21), and the plurality of branch pipes extend into the plurality of clearance through holes.

7. The positioning fixture for screen printing according to any one of claims 1 to 3, characterized in that, The control component (50) is a first solenoid valve.

8. A screen printing device, characterized in that, include: Rack (10); Positioning fixture for screen printing as described in any one of claims 1 to 7; The printing section has a printing end; The control system includes a controller and a drive component electrically connected to the controller, the drive component being used to drive the printing end closer to or further away from the screen printing positioning fixture, and the control component (50) being electrically connected to the drive component.

9. The screen printing equipment according to claim 8, characterized in that, The driving component includes: A cylinder having two air inlets, wherein the drive end of the cylinder is connected to the printing end; The second solenoid valve (60) has an inlet end and two outlet ends, the inlet end being selectively connected to one of the two outlet ends, and the second solenoid valve (60) is electrically connected to the control element (50). The second pipeline (90) has one end connected to the air source and the other end connected to the air inlet. Two third pipes are connected to the two air outlets respectively, and the two third pipes are connected to the two air inlets of the cylinder respectively.

10. The screen printing equipment according to claim 9, characterized in that, The screen printing equipment also includes a main pipe (80) and a three-way connector (91). One end of the main pipe (80) is connected to the air source, the other end of the main pipe (80) is connected to the first end of the three-way connector (91), the second end of the three-way connector (91) is connected to the first pipeline (70) of the adsorption section, and the third end of the three-way connector (91) is connected to the second pipeline (90).

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