Printing device and printing screen thereof

Abstract

The utility model provides a printing device and a printing screen thereof. The printing screen comprises a screen body, a frame and a plurality of adjusting pieces. A plurality of printing holes are formed in the screen body at intervals. The frame is annularly arranged on the periphery of the net body, and a gap is formed between the frame and the peripheral side of the net body. The multiple adjusting pieces are arranged in the circumferential direction of the net body at intervals, and the adjusting pieces are arranged between the frame and the net body. The adjusting pieces are fixedly connected with the net body and can move relative to the frame so as to drive the peripheral side of the net body to be relatively close to or away from the frame, and therefore the net body is stretched or released. According to the application, the plurality of adjusting pieces are arranged on the periphery of the net body, and the adjusting pieces move relative to the frame, so that the net body is pulled to enable the peripheral side of the net body to be relatively close to or far away from the frame, the net body is stretched to be in a stretched state, or the net body is released to enable the net body to rebound, and then the tension of the net body is adjusted; therefore, the device is suitable for substrates with different expansion and contraction degrees.

Description

Technical Field

[0001] The utility model relates to the technical field of display screen production, in particular to a printing device and a printing net thereof. Background Art

[0002] With the continuous advancement of display technology, Micro LED (micro light-emitting diode display) is considered a strong contender for the next generation of display technology due to its excellent performance, such as high brightness, high contrast, low power consumption, and fast response. Micro LEDs are typically sized between a few microns and tens of microns, which places extremely high demands on the manufacturing process. In the production of Micro LEDs, printing technology is widely used to transfer tiny LED chips to the Micro LED substrate. During the printing process, a printed steel mesh is often used to help deposit solder paste in the precise location on the substrate.

[0003] However, since the substrate undergoes a high-temperature pressing process during its production, it is prone to expansion and contraction. At this time, if the shape and size of the printed holes on the printed steel mesh remain unchanged, the printed holes on the printed steel mesh and the preset solder paste deposition positions on the substrate will be offset, which will cause the position of the LED chip to shift, affecting the luminous effect. Utility Model Content

[0004] The purpose of the utility model is to provide a printing device with higher precision and a printing screen thereof.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] According to one aspect of the present application, the present application provides a printing web, comprising:

[0007] a mesh body having a plurality of printing holes spaced apart thereon;

[0008] A frame is arranged around the outer periphery of the net body, with a gap between the frame and the outer periphery of the net body;

[0009] A plurality of adjusting members are arranged at intervals along the circumference of the mesh body, and the adjusting members are arranged between the frame and the mesh body; each adjusting member is connected and fixed to the mesh body and can move relative to the frame to drive the outer peripheral side of the mesh body relatively close to or away from the frame, thereby stretching or releasing the mesh body.

[0010] In some embodiments, the printing screen further comprises a plurality of connecting members, which are arranged on the frame at intervals along the circumference of the frame; each of the connecting members is rotatable relative to the frame, and the direction of the rotation axis of the connecting member is consistent with the moving direction of the adjusting member.

[0011] The plurality of adjusting members are arranged on the connecting member in a one-to-one correspondence, and the connecting member rotates relative to the frame, so that the adjusting members move relative to the frame and move closer to or away from the frame.

[0012] In some embodiments, each of the adjusting members is provided with an adjusting hole, the connecting member partially extends into the adjusting hole, and the inner peripheral wall of the adjusting hole is provided with an internal thread;

[0013] The outer periphery of the connecting piece is provided with an external thread, and the external thread is threadedly adapted to the internal thread.

[0014] In some embodiments, the printing screen further comprises a plurality of elastic members, each of the adjusting members is connected to an elastic member, the ends of the elastic members facing away from the adjusting members are connected to the frame, and the elastic members can expand and contract as the adjusting members move.

[0015] In some embodiments, the printing screen further comprises a plurality of driving members, wherein the plurality of driving members are arranged in one-to-one correspondence with the plurality of adjusting members, and each of the driving members is drivingly connected to the correspondingly arranged adjusting member for driving the adjusting member to move.

[0016] In some embodiments, the printing screen further comprises a tension detector, which is provided on the screen body and is used to detect the tension of the screen body;

[0017] The printing screen further includes a controller, which is electrically connected to the tension detector and the plurality of driving elements. The controller is configured to receive a tension signal transmitted by the tension detector and regulate the driving elements according to the tension signal.

[0018] In some embodiments, there are multiple tension detectors, and the multiple tension detectors are spaced apart along the circumference of the mesh body;

[0019] The mesh body is rectangular; a tension detector is respectively arranged at the four corners of the mesh body.

[0020] In some embodiments, the printing screen further includes an operation panel, which is electrically connected to the driving member, the tension detector, and the controller, and is used to display the operating parameters of the driving member and the tension signal, and to transmit control signals to the controller.

[0021] In some embodiments, the mesh is an elastic steel mesh;

[0022] The mesh body is rectangular, and the angles of the mesh body are rounded.

[0023] According to another aspect of the present application, the present application further provides a printing device, comprising a printing apparatus and a printing screen as described above, wherein the printing screen is fixedly connected to the printing apparatus.

[0024] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0025] In the present application, the mesh and the frame are arranged along the inner and outer intervals, and the mesh and the frame are connected by a plurality of adjusting parts. Since each adjusting part can move relative to the frame, the mesh can be pulled so that the outer peripheral side of the mesh is relatively close to or away from the frame, and the mesh can be stretched to be in a stretched state, or the mesh can be released to make the mesh rebound, thereby adjusting the tension of the mesh to adapt to substrates with different expansion and contraction degrees, so as to align the printing holes on the mesh with the preset solder paste printing positions on the expanded and contracted substrates, thereby improving the printing quality of the solder paste, enhancing the reliability of printing, and providing a reliable and powerful guarantee for the display effect of the display screen. In addition, the above design can also reduce the frequency of replacing the printing mesh, reduce the number of printing meshes purchased, improve production efficiency, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of the printing screen in this embodiment.

[0027] Figure 2 yes Figure 1 Enlarged structural diagram at point A in the middle.

[0028] The following are the descriptions of the reference numerals:

[0029] 1. Mesh; 11. Printing hole; 2. Frame; 3. Adjustment part; 4. Connecting part; 5. Elastic part; 6. Tension detector. DETAILED DESCRIPTION

[0030] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention is capable of various variations in different embodiments without departing from the scope of the present invention, and that the descriptions and illustrations herein are intended to be illustrative in nature and not to limit the present invention.

[0031] In the description of this application, it should be understood that in the embodiments shown in the drawings, indications of directions or positional relationships (such as up, down, left, right, front, and back) are merely for the convenience of describing this application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions will also change accordingly.

[0032] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0033] The present application provides a printing screen for printing solder paste on a display screen substrate to facilitate solder paste deposition at predetermined solder paste deposition locations on the substrate. The substrate surface is provided with a plurality of solder pads spaced apart and arranged in an array, with each solder pad facing away from the substrate surface to form a solder paste deposition location.

[0034] The specific embodiments of the printing screen of the present application are described in detail below with reference to the accompanying drawings.

[0035] Figure 1 Schematic diagram of the structure of the printing screen in this embodiment, Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle.

[0036] refer to Figure 1 and Figure 2 The printing screen includes a screen body 1, a frame 2 and a plurality of adjusting parts 3. A plurality of printing holes 11 are provided on the screen body 1 at intervals. The frame 2 is arranged around the periphery of the screen body 1, and there is a gap between the frame 2 and the outer peripheral side of the screen body 1. A plurality of adjusting parts 3 are arranged at intervals along the circumference of the screen body 1, and the adjusting parts 3 are arranged between the frame 2 and the screen body 1. Each adjusting part 3 is connected and fixed to the screen body 1, and can move relative to the frame 2 to drive the outer peripheral side of the screen body 1 to be relatively close to or away from the frame 2, thereby stretching or releasing the screen body 1.

[0037] In the present application, the mesh 1 and the frame 2 are arranged along the inner and outer intervals, and the mesh 1 and the frame 2 are connected by a plurality of adjusting parts 3. Since each adjusting part 3 can move relative to the frame 2, the mesh 1 can be pulled so that the outer peripheral side of the mesh 1 is relatively close to or away from the frame 2, and the mesh 1 can be stretched to be in a stretched state, or the mesh 1 can be released to make the mesh 1 rebound, thereby adjusting the tension of the mesh 1 to adapt to substrates with different degrees of expansion and contraction, so as to facilitate the alignment of the printing holes 11 on the mesh 1 with the preset solder paste printing positions on the substrate after expansion and contraction, thereby improving the printing quality of the solder paste, enhancing the reliability of printing, and providing a reliable and powerful guarantee for the display effect of the display screen. In addition, the above design can also reduce the frequency of replacing the printing mesh, reduce the number of printing meshes purchased, improve production efficiency, and reduce production costs.

[0038] refer to Figure 1The two opposite surfaces of the mesh body 1 are respectively a first surface and a second surface. The first surface of the mesh body 1 is used to carry solder paste. The second surface of the mesh body 1 is used to adhere to the surface of the substrate.

[0039] The mesh 1 is provided with a plurality of printing holes 11 at intervals for passage of solder paste located on the first surface of the mesh 1. Specifically, the plurality of printing holes 11 are distributed in an array on the mesh 1. Furthermore, the placement of the plurality of printing holes 11 on the mesh 1 corresponds one-to-one with the placement of the plurality of pre-set solder paste locations on the substrate. In actual use, solder paste located on the first surface of the mesh 1 passes through the printing holes 11 and adheres to the pre-set solder paste locations on the substrate surface that is in contact with the second surface of the mesh 1.

[0040] In this embodiment, the mesh 1 is an elastic steel mesh, and has elasticity so that it can be stretched or released to change the tension of the mesh 1, thereby changing the position, shape, size, etc. of the printing holes 11 arranged on the mesh 1, and adapting to substrates with different degrees of expansion and contraction, so as to facilitate the alignment of the printing holes 11 on the mesh 1 with the preset solder paste printing positions on the substrate after expansion and contraction, thereby improving the printing quality of the solder paste and enhancing the reliability of printing.

[0041] Exemplarily, the mesh body 1 can be 304 stainless steel mesh, FG steel mesh, high carbon steel mesh, spring steel mesh, etc.

[0042] In this embodiment, the mesh 1 is rectangular, which is convenient for matching with a similarly rectangular substrate and increasing the utilization area of the mesh 1. The corners of the mesh 1 are excessively rounded to reduce stress concentration and extend the service life of the mesh 1.

[0043] In this embodiment, the frame 2 is arranged around the outer periphery of the net body 1, and there is a gap between the frame 2 and the peripheral side of the net body 1 to leave a margin for the stretching or rebound of the net body 1, ensuring that the net body 1 can be deformed smoothly inside the frame 2.

[0044] Specifically, the frame 2 includes two side beams and two cross beams. The two side beams are spaced apart, and the two cross beams are spaced apart and connected between the two side beams. Moreover, the two side beams and the two cross beams are connected end to end to form a frame 2 structure with a rectangular cross section, which is convenient for adapting to the rectangular mesh body 1 and is easy to manufacture.

[0045] In this embodiment, the connection between adjacent side beams and cross beams is rounded to reduce stress concentration and extend the service life of the frame 2.

[0046] In this embodiment, the frame 2 is made of aluminum alloy. Since aluminum alloy has high strength, the frame 2 made of aluminum alloy has sufficient rigidity and stability, and can ensure that the frame 2 is not easily deformed.

[0047] refer to Figure 1 and Figure 2 A plurality of adjusting members 3 are arranged at intervals along the circumference of the net 1, and the adjusting members 3 are arranged between the frame 2 and the net 1. The adjusting members 3 are fixedly connected to the net 1 and are movable relative to the frame 2. In practical applications, the adjusting members 3 can be moved relative to the frame 2 to move the outer circumference of the net 1 closer to or away from the frame 2, thereby stretching or releasing the net 1, causing the net 1 to deform, thereby achieving tension adjustment of the net 1.

[0048] Specifically, each adjusting member 3 moves in a direction perpendicular to the edge of the net body 1 where it is located, so that the pulling force or pushing force generated by the adjusting member 3 on the net body 1 due to movement can fully act on the net body 1, thereby improving the tension adjustment effect of the net body 1.

[0049] For example, the adjusting member 3 is provided with a receiving groove for receiving the outer periphery of the net body 1 and is fixedly connected to the net body 1, which can improve the connection strength and stability between the adjusting member 3 and the net body 1. Alternatively, the adjusting member 3 can be directly attached to the outer periphery of the net body 1 and fixedly connected.

[0050] In this embodiment, the printing screen also includes multiple connecting parts 4, which are arranged on the frame 2 at intervals along the circumference of the frame 2. Each connecting part 4 can rotate relative to the frame 2, and the direction of the rotation axis of the connecting part 4 is consistent with the moving direction of the adjusting part 3.

[0051] In this embodiment, a plurality of adjusting members 3 are provided on the connecting member 4 in a one-to-one correspondence. The connecting member 4 rotates relative to the frame 2 , so that the adjusting members 3 can move relative to the frame 2 and move closer to or away from the frame 2 .

[0052] Specifically, each adjusting member 3 is provided with an adjusting hole, and a portion of the connecting member 4 can extend into the adjusting hole.

[0053] The inner peripheral wall of the adjustment hole is provided with an internal thread. The outer periphery of the connecting member 4 is provided with an external thread, and the connecting member 4 is screwed to the correspondingly arranged adjustment member 3 through a thread. In actual application, by rotating the connecting member 4 relative to the frame 2, at this time, under the cooperation of the internal thread and the external thread, the rotational motion of the connecting member 4 can be converted into the linear motion of the adjustment member 3 along the connecting member 4. In addition, since the adjustment member 3 and the connecting member 4 are connected by threads, it is also convenient to disassemble the adjustment member 3 and the connecting member 4, and the net body 1 can be removed from the frame 2 for cleaning, maintenance, replacement, etc. of the net body 1; at the same time, the above-mentioned connection method also facilitates the connection between the adjustment member 3 and the connecting member 4, thereby realizing the installation and fixation of the net body 1 and the frame 2.

[0054] Alternatively, the connecting member 4 can also be rotatably connected to the adjusting member 3. In this case, a connecting hole with its opening facing the mesh body 1 is provided on the frame 2, the inner wall of the connecting hole is provided with an internal thread, and the outer periphery of the connecting member 4 is provided with an external thread. The connecting member 4 and the frame 2 are threadedly connected through the cooperation of the internal thread and the external thread.

[0055] In other embodiments, the adjusting member 3 may also be directly slidably connected to the connecting member 4 .

[0056] In this embodiment, the printing screen further includes multiple driving members, each of which corresponds to a plurality of adjusting members 3. Each driving member is drivably connected to a corresponding adjusting member 3 to drive the adjusting member 3 to move. Specifically, the output end of the driving member is fixedly connected to the connecting member 4, and the driving member is used to drive the connecting member 4 to rotate, thereby achieving movement of the adjusting member 3.

[0057] In this embodiment, the driving component may be a rotary motor, a rotary cylinder, etc.

[0058] In some embodiments, the whole formed by the adjusting part 3, the connecting part 4 and the driving part of the printing screen can be directly replaced by a telescopic motor or a telescopic cylinder, etc. At this time, the output shaft of the telescopic motor or the telescopic cylinder is directly fixed to the periphery of the screen body 1. The movement of the output shaft of the telescopic motor or the telescopic cylinder can directly drive the peripheral side of the screen body 1 closer to or away from the frame 2, which can simplify the structure of the printing screen and save costs.

[0059] In this embodiment, the printing mesh further includes a plurality of elastic members 5. Each adjusting member 3 is connected to an elastic member 5. The end of each elastic member 5 facing away from the adjusting member 3 is connected to the frame 2. The elastic members 5 can expand and contract with the movement of the adjusting member 3. During the expansion and contraction process of the elastic members 5, the elastic members 5 deform and accumulate elastic potential energy. Moreover, after being stable between the mesh body 1 and the frame 2, the elastic members 5 are in a state of pre-releasing elastic potential energy to restore the deformation, and can apply a pulling force or pushing force to the mesh body 1, thereby providing a certain pre-tightening force to the mesh body 1, so that the mesh body 1 can maintain the adjusted tension. At the same time, the elastic members 5 can also play a buffering role, so that the outer peripheral side of the mesh body 1 can move smoothly toward or away from the frame 2, and can reduce the influence of external shocks on the tension of the mesh body 1.

[0060] Among them, the elastic member 5 can be directly fixedly connected to the adjusting member 3 and the frame 2. In other embodiments, the elastic member 5 can also be detachably connected to the adjusting member 3 and the frame 2, so that it is convenient to disassemble the elastic member 5 from the adjusting member 3 and / or the frame 2, thereby enabling the net body 1 to be removed from the frame 2. Exemplarily, a hook is provided on the adjusting member 3 and / or the frame 2, and a connecting ring is provided at the end of the elastic member 5. By hanging the connecting ring on the hook, the connection between the elastic member 5 and the adjusting member 3 and / or the frame 2 can be achieved. Similarly, by removing the connecting ring from the hook, the elastic member 5 can be removed from the adjusting member 3 and / or the frame 2, which is convenient and simple to operate. Alternatively, the detachable connection here can also be achieved by means of a snap-fit connection between a hook and a slot.

[0061] In this embodiment, the elastic member 5 is also sleeved on the outer circumference of the connecting member 4 , which can ensure that the elastic member 5 is deformed only in its own length direction, thereby ensuring the effect of the elastic member 5 .

[0062] In other embodiments, the elastic member 5 may also be connected and fixed between the adjusting member 3 and the net body 1 .

[0063] In some embodiments, when the printing screen is directly replaced by a telescopic motor or cylinder, the elastic member 5 is directly connected between the screen body 1 and the frame 2. Furthermore, the elastic member 5 can be mounted on the output shaft of the telescopic motor or cylinder to ensure that the elastic member 5 deforms only in its own longitudinal direction, thereby ensuring the effectiveness of the elastic member 5.

[0064] In this embodiment, the elastic member 5 is a spring.

[0065] In this embodiment, the printing screen further includes a tension detector 6 , which is disposed on the screen 1 and is used to detect the tension of the screen 1 and generate a tension signal. This facilitates the operator to check the tension adjustment status of the screen 1 and determine the next operation based on the tension signal. Specifically, the tension detector 6 is disposed on the first side of the screen 1 .

[0066] In this embodiment, there can be multiple tension detectors 6, and the multiple tension detectors 6 are distributed at intervals along the circumference of the printing screen. The multiple tension detectors 6 cooperate to detect the tension size of each area of the screen 1, which can improve the accuracy of the detection. In addition, it can also facilitate targeted tension adjustment of each area of the screen 1 to improve the accuracy of the tension adjustment of the screen 1.

[0067] For example, a tension detector 6 is positioned at each of the four corners of the mesh 1. Because the mesh 1 is rectangular, after its periphery is connected to the frame 2 via the adjustment member 3, the forces acting on the corners of the mesh 1 are greater than those acting on the remaining edges. This means that the corners of the mesh 1 are critical stress points. Therefore, by positioning tension detectors 6 at the corners of the mesh 1, the tension at these corners can be better monitored, facilitating adjustment of the tension at the angles of the mesh 1.

[0068] In this embodiment, the printing screen also includes a controller, which is electrically connected to the tension detector 6 and multiple driving parts. The controller is used to receive the tension signal transmitted by the tension detector 6. After performing data processing and control algorithm calculations, the controller can adjust the driving part according to the tension signal, so that the driving part drives the connecting part 4 to rotate, so that the adjusting part 3 drives the outer peripheral side of the mesh body 1 to move along the connecting part 4, so as to automatically realize the tension adjustment of the mesh body 1.

[0069] In this embodiment, the controller may be a microprocessor or a programmable logic controller, etc.

[0070] In this embodiment, the printing screen also includes an operation panel, which is electrically connected to the drive unit, the tension detector 6, and the controller. The operation panel can receive and display the operating parameters of the drive unit, the tension signal transmitted by the tension detector 6, etc. At the same time, the staff can operate the control panel to transmit a control signal to the controller to control the opening and closing of the controller. Specifically, the operation panel integrates a display function and an operation function. In actual application, the staff can input a preset tension value into the controller through the operation panel, so that the controller can perform data processing and control algorithm calculation based on the preset tension value and the received tension signal to obtain the tension adjustment parameter of the screen body 1 and display the tension adjustment parameter on the operation panel. At the same time, the operation panel can display the tension signal received by the tension detector 6, which facilitates the staff to operate and monitor the tension adjustment process of the screen body 1.

[0071] Among them, the preset tension value is determined according to the expansion and contraction parameters of the substrate to be printed with solder paste, so that the printing holes 11 on the mesh body 1 after tension adjustment can be accurately aligned with the pads on the substrate, thereby improving the accuracy of solder paste printing on the substrate.

[0072] In this embodiment, the operation panel may be in the form of a touch screen, a display screen, buttons, etc.

[0073] According to another aspect of the present application, a printing device is provided, comprising a printing device and the aforementioned printing screen. The printing device and the printing screen are connected and fixed, and the two cooperate to perform the solder paste printing process on the substrate. Specifically, the frame 2 of the printing screen is provided with mounting holes spaced along the circumference for connection and fixation with the printing device.

[0074] An exemplary workflow of the printing device is as follows:

[0075] First, the printing screen is fixed to the printing device through the mounting hole. Then, the preset tension value of the mesh body 1 is input to the controller through the operation panel. The tension detector 6 detects the tension of the mesh body 1 in real time, and forms a tension signal with the detected tension and transmits it to the controller. The controller performs data processing and control algorithm calculations based on the set preset tension value and the actual detected tension, and then outputs a control signal to the driver according to the calculation result, so that the driver drives the connecting member 4 to rotate relative to the frame 2. In this process, under the cooperation of the external thread and the internal thread, the rotational motion of the connecting member 4 can be converted into the linear motion of the adjusting member 3 along the connecting member 4, so that the outer peripheral side of the mesh body 1 can approach or move away from the frame 2 as the adjusting member 3, thereby realizing the tension adjustment of the mesh body 1, so that the tension of the mesh body 1 gradually approaches the preset tension value until it reaches the preset tension value. After the tension of the mesh body 1 reaches the preset tension value, the printing device can perform the solder paste printing operation on the substrate.

[0076] During the solder paste printing process, tension detector 6 remains operational to continuously monitor the tension of mesh 1. Similarly, the controller remains operational, automatically adjusting the drive element based on the preset tension value and the actual measured tension to adjust the tension of mesh 1. This ensures that the tension of mesh 1 remains stable at the preset tension value until solder paste printing is complete, ensuring stable and accurate solder paste printing on the substrate. After printing is complete, the printing mesh is removed from the printing equipment for cleaning and maintenance.

[0077] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0078] In the present application, the mesh and the frame are arranged along the inner and outer intervals, and the mesh and the frame are connected by a plurality of adjusting parts. Since each adjusting part can move relative to the frame, the mesh can be pulled so that the outer peripheral side of the mesh is relatively close to or away from the frame, and the mesh can be stretched to be in a stretched state, or the mesh can be released to make the mesh rebound, thereby adjusting the tension of the mesh to adapt to substrates with different expansion and contraction degrees, so as to align the printing holes on the mesh with the preset solder paste printing positions on the expanded and contracted substrates, thereby improving the printing quality of the solder paste, enhancing the reliability of printing, and providing a reliable and powerful guarantee for the display effect of the display screen. In addition, the above design can also reduce the frequency of replacing the printing mesh, reduce the number of printing meshes purchased, improve production efficiency, and reduce production costs.

[0079] While the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope of the appended claims. Therefore, all changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims

1. A printing screen, characterized in that include: a mesh body having a plurality of printing holes spaced apart thereon; A frame is arranged around the outer periphery of the net body, with a gap between the frame and the outer periphery of the net body; A plurality of adjusting members are arranged at intervals along the circumference of the mesh body, and the adjusting members are arranged between the frame and the mesh body; each adjusting member is connected and fixed to the mesh body and can move relative to the frame to drive the outer peripheral side of the mesh body relatively close to or away from the frame, thereby stretching or releasing the mesh body.

2. The printing screen according to claim 1, characterized in that The printing screen further comprises a plurality of connecting members, which are arranged on the frame at intervals along the circumference of the frame; each of the connecting members is rotatable relative to the frame, and the direction of the rotation axis of the connecting member is consistent with the moving direction of the adjusting member. The plurality of adjusting members are arranged on the connecting member in a one-to-one correspondence, and the connecting member rotates relative to the frame, so that the adjusting members move relative to the frame and move closer to or away from the frame.

3. The printing screen according to claim 2, characterized in that Each of the adjusting members is provided with an adjusting hole, the connecting member partially extends into the adjusting hole, and the inner peripheral wall of the adjusting hole is provided with an internal thread; The outer periphery of the connecting piece is provided with an external thread, and the external thread is threadedly adapted to the internal thread.

4. The printing screen according to claim 1, wherein The printing screen further comprises a plurality of elastic members, each of the adjusting members is connected to an elastic member, the ends of the elastic members facing away from the adjusting members are connected to the frame, and the elastic members can expand and contract as the adjusting members move.

5. The printing screen according to claim 1, wherein The printing screen further comprises a plurality of driving members, which are arranged in one-to-one correspondence with the plurality of adjusting members. Each driving member is drivingly connected to the correspondingly arranged adjusting member to drive the adjusting member to move.

6. The printing screen according to claim 5, characterized in that The printing screen further comprises a tension detector, which is arranged on the screen body and is used to detect the tension of the screen body; The printing screen further includes a controller, the controller being electrically connected to the tension detector and the plurality of driving members; The controller is used to receive the tension signal transmitted by the tension detector and regulate the driving member according to the tension signal.

7. The printing screen according to claim 6, characterized in that There are multiple tension detectors, and the multiple tension detectors are spaced apart along the circumference of the mesh body; The mesh body is rectangular; a tension detector is respectively arranged at the four corners of the mesh body.

8. The printing screen according to claim 6, wherein The printing screen further includes an operation panel, which is electrically connected to the driving member, the tension detector, and the controller, and is used to display operating parameters of the driving member and the tension signal, and to transmit control signals to the controller.

9. The printing screen according to claim 1, wherein The mesh body is an elastic steel mesh; The mesh body is rectangular, and the angles of the mesh body are rounded.

10. A printing device, characterized in that: The invention comprises a printing device and a printing screen as claimed in any one of claims 1 to 9, wherein the printing screen is fixedly connected to the printing device.

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