A net stretching device and use method

Abstract

The present invention relates to manufacturing equipment, and in particular to a structural design and use method of a net-stretching device. The net-stretching device in the present invention includes a clamping system, a measuring system, a welding system, a motion system, a pre-alignment platform, a mask frame platform, a vibration reduction platform, a handling system and a control unit. The clamping system includes a clamping platform, and multiple groups of clamping bodies, clamping heads, sliders, stabilizing mechanisms and adsorption bases located on the clamping platform. The present invention also provides a method for using the net-stretching device to stretch a net. The net-stretching device provided by the present invention utilizes the interaction between the stabilizing mechanism in the clamping system and the adsorption base to eliminate the displacement and rotation of the clamping mechanism in the net-stretching process, thereby improving the accuracy of the net-stretching, and improving the efficiency and yield of the net-stretching.

Description

Technical Field

[0001] The invention relates to manufacturing equipment, and in particular to a mesh stretching device for stretching and welding a metal mask and a use method thereof. Background Art

[0002] Organic Light Emitting Diode (OLED) is a new technology used in the field of flat panel displays. It has achieved rapid development and successful mass production in recent years. Compared with traditional liquid crystal display panels, OLED display panels have many advantages such as self-luminescence, simple structure, wide viewing angle, wide color gamut, high contrast, low power consumption, fast response, and flexible display, and are favored by the market.

[0003] In the preparation process of OLED light-emitting devices, a variety of organic and inorganic materials need to be formed into films on a glass substrate through a vacuum evaporation process. In order to form a film layer with a specific pattern array, a metal mask is required in the process, including a common metal mask (CMM) and a fine metal mask (FMM). The mask is usually fixed on a metal mask frame and placed inside an evaporation machine for use. Before the evaporation process, the metal mask screen needs to be clamped, stretched, measured, and adjusted in a stretching machine until it meets the specifications and then welded to the mask frame, which is the stretching process. Since the metal mask after stretching is one of the core fixtures of the subsequent evaporation process, there is a driving force to continuously improve the yield and efficiency of the stretching process. In the prior art, the clamping mechanism may cause the rotation of the clamping mechanism itself in the process of clamping the metal mask and moving it to the stretching station and in the process of stretching the metal mask, forming a small angle with the metal mask; and the rotation angles of each clamping mechanism are different. This will have two adverse effects: first, it will change the direction in which the clamping mechanism applies the pulling force to the metal mask, causing wrinkles on the metal mask and affecting the yield of the screen stretching process; in addition, it will make the magnitude of the pulling force applied to the metal mask different from the actual value, causing the screen stretching process to be uncontrollable, thus affecting the efficiency of the screen stretching process. Summary of the invention

[0004] The present invention provides a stretching device for stretching a metal mask and welding it to a mask frame, the stretching device comprising a clamping system, the clamping system comprising a clamping platform, and multiple groups of clamping bodies, clamping heads, sliders, stabilizing mechanisms and adsorption bases located on the clamping platform;

[0005] A measuring system, wherein the measuring system measures the position of the clamping jaws and the tension of the metal mask;

[0006] A welding system, wherein the welding system is used to weld the metal mask to the mask frame;

[0007] A motion system, which accurately positions and controls the gripper system, the welding system, and the measuring system;

[0008] A pre-alignment stage, the pre-alignment stage is used to carry the metal mask and perform rough alignment;

[0009] A mask frame platform, the mask frame platform carries the mask frame and positions it precisely;

[0010] A vibration reduction platform, which carries the clamping system, the measuring system, the welding system, the motion system and the mask frame platform and reduces vibrations caused by the inside or outside of the net welding system;

[0011] A handling system, wherein the handling system is used to carry in and out the metal mask and the mask frame;

[0012] A control unit is used to control the net stretching process of the net stretching device.

[0013] Optionally, the stabilizing mechanism is arranged below the clamp body and located on both sides of the slider, and the adsorption base is installed on the clamp platform and located below the stabilizing mechanism. The attraction between the stabilizing mechanism and the adsorption base controls the relative stability between the clamp body and the clamp platform.

[0014] Optionally, the stabilizing mechanism is an electromagnetic control mechanism, and the adsorption base is a block material made of ferromagnetic material or ferrimagnetic material.

[0015] Optionally, the electromagnetic control mechanism includes a housing, an electromagnetic coil and a soft iron core, wherein the electromagnetic coil surrounds the soft iron core, and current can flow through the electromagnetic coil to generate a magnetic field.

[0016] Optionally, the stabilizing mechanism is a block material made of ferromagnetic material or ferrimagnetic material, and the adsorption base is an electromagnetic control mechanism.

[0017] Optionally, the electromagnetic control mechanism includes a shell, an electromagnetic coil group and a soft iron core group, the electromagnetic coil group includes multiple coils and can pass current to generate a magnetic field, and the soft iron core group includes multiple soft iron cores, and the multiple soft iron cores are respectively located at the center of the multiple coils.

[0018] Optionally, the plurality of electromagnetic coils may be controlled separately, and current may be passed through one or more of the electromagnetic coils to generate a magnetic field.

[0019] Optionally, there is no contact between the stabilizing mechanism and the adsorption base, and the distance between the stabilizing mechanism and the adsorption base is not greater than 500 microns and not less than 10 microns.

[0020] Optionally, the clamp body is provided with positioning marks, and the positioning marks are located at the front end and the rear end of the clamp body, and the measuring system can accurately measure the positions of the positioning marks.

[0021] The present invention also provides a method for using the above-mentioned net-stretching device, comprising the following steps:

[0022] Step 1: the transport system transports the metal mask frame to the mask frame platform, and transports the metal mask to the pre-alignment platform and performs pre-alignment;

[0023] Step 2: The clamping platform moves to both sides of the pre-alignment platform, and each clamping claw moves to a suitable position. The clamping claw head clamps the metal mask and applies a certain pulling force, and then the flat claw platform moves to the net stretching station;

[0024] Step 3: fine-adjusting each of the clamping jaws to a suitable position on the clamping jaw platform;

[0025] Step 4: The measuring system grabs the alignment mark to confirm whether the position and parallelism of each clamping jaw meet the specification. If not, return to step 3. If yes, the electromagnetic coil is energized to generate a magnetic field, and the stabilizing mechanism and the adsorption base are adsorbed to each other.

[0026] Step 5: The measuring system detects again whether the position of each clamping jaw reaches the specification. If it does not reach the specification, the electromagnetic coil is first closed, and the displacement to be compensated by the motor is given. The motor compensates according to the displacement, and then the electromagnetic coil is opened;

[0027] Step 6: Start the screen stretching process, align, measure and weld the metal mask;

[0028] Step 7: close the electromagnetic base and determine whether all the nets have been stretched. If not, the transport system moves a new metal mask and returns to step 2. If all the nets have been stretched, proceed to the next step.

[0029] Step 8: The transport system carries out the mask frame after the net is stretched.

[0030] The net stretching equipment provided by the present invention is used for stretching and welding metal mask plates. Because the clamping mechanism of the net stretching equipment provided by the present invention adsorbs each other between the clamping claw body and the clamping claw platform by magnetic force, compared with the structure in the prior art that only limits the rotation of the clamping mechanism by guide rails, the net stretching equipment provided by the present invention can eliminate the displacement and rotation of the clamping mechanism in the net stretching process, thereby improving the net stretching accuracy, and improving the net stretching efficiency and yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is a top view of a schematic diagram of a clamping mechanism in the prior art.

[0032] Figure 2 It is a schematic diagram of the connection between the clamping claw body and the guide rail in the clamping mechanism in the prior art.

[0033] Figure 3 This is a schematic diagram of the overall structure of the clamping mechanism provided in Example 1 of the present invention.

[0034] Figure 4 This is a cross-sectional view of the electromagnetic control mechanism provided in the first embodiment of the present invention.

[0035] Figure 5 This is a schematic diagram of the overall structure of the clamping mechanism provided in the second embodiment of the present invention.

[0036] Figure 6 This is a cross-sectional view of the electromagnetic control mechanism provided in the second embodiment of the present invention.

[0037] Figure 7 A schematic diagram of the steps for using the net-stretching device provided by the present invention. DETAILED DESCRIPTION

[0038] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present invention will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0039] In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solution of the present invention can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring various aspects of the present invention.

[0040] In addition, for the convenience of explanation in the drawings, the size of each structure may be enlarged or reduced. For example, the size, thickness and spacing of each structure shown in the drawings are arbitrarily shown for the convenience of explanation, and thus the present invention is not necessarily limited to the shown.

[0041] In addition, the step diagrams shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor do they have to be performed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0042] Please refer to Figure 1 , Figure 1 It is a top view of the schematic diagram of the clamping mechanism in the existing web stretching equipment. The clamping mechanism 100 in the prior art is used to clamp and stretch the metal mask 101. The metal mask 101 includes an effective evaporation area 103 (composed of a pixel hole array) and a non-effective evaporation area 104. The two ends 105 and 106 of the metal mask 101 can be divided into multiple branches, which also determines that the metal mask 101 should be stretched by a corresponding number of clamps (here are two groups of clamps). On both sides of the metal mask 101 are two symmetrical clamping platforms 107 and 108, which are located above the vibration reduction platform (not shown) and can be driven by a motor (not shown). There are two groups of four clamping jaw bodies 109 / 110 / 111 / 112 on the left and right sides, which are respectively connected to the inner clamping jaw heads 113 / 114 / 115 / 116. The clamping jaw heads 113 / 114 / 115 / 116 clamp the two ends 105 / 106 of the metal mask 101. The clamping jaw bodies 109 / 110 / 111 / 112 are driven by motors 117 / 118 / 119 / 120, and the bottom is connected to the motor screw 121 / 122. The two sides are connected to the inner guide rails 123 / 124 and the outer guide rails 125 / 126 by sliders (not shown). The rear end cable (not shown) is connected to the lower side of the clamping jaw platform 107 / 108 through the grooves 127 / 128 dug into the clamping jaw platform. Please refer to the following for synchronization. Figure 2 , Figure 2 Schematic diagram of the connection between the clamp body and the guide rail in the clamping mechanism in the prior art. The front end of the clamp body 201 is the upper side 203 of the clamp head and the lower side 205 of the clamp head, and the bottom is connected to the slider 207. The slider 207 can slide along the guide rail 209. The side of the guide rail 209 has a groove 211, and the end is a section 213. The upper side 203 of the clamp head can move toward the lower side 205 of the clamp head to clamp the metal mask 101. For the convenience of description below, it is stipulated that the stretching direction of the metal mask 101 is the first direction, the direction in which the motor 117 / 118 / 119 / 120 drives the corresponding clamp body 109 / 110 / 111 / 112 and the direction in which the motor (not shown) drives the clamp platform 107 / 108 is the same, which is the second direction, and the direction in which the upper side 203 of the clamp head moves is the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0043] In the prior art, there is a tiny gap at the contact point between the slider 207 and the guide rail groove 211, and accordingly, there is also a tiny gap between the slider and the guide rail (not shown) at the lower side of the clamping platform 107 / 108. Therefore, after the clamping heads 113 / 114 / 115 / 116 clamp the two ends of the metal mask 101, the clamping platform 107 / 108 moves to the net stretching station along the second direction, and the motor 117 / 118 / 119 / 120 drives the clamping body 109 / 110 / 111 / 112 along the second direction for fine adjustment, the clamping body 109 / 110 / 111 / 112 will rotate slightly, and the rotation angles are different. In addition, when the clamping jaws 113 / 114 / 115 / 116 stretch the metal mask 101 along the first direction, the metal mask 101 will generate a reaction force on the clamping jaws. The reaction force can be divided into a component along the first direction and a component along the second direction. The component along the second direction will also cause each clamping jaw body 109 / 110 / 111 / 112 to rotate slightly, and the rotation angles are different. The rotation caused by the above two factors has two adverse effects: first, the direction in which the clamping jaws 113 / 114 / 115 / 116 apply the pulling force to the metal mask 101 will change, and it will no longer be parallel to the first direction, thereby causing wrinkles on the metal mask 101, affecting the yield of the net stretching process; in addition, the magnitude of the pulling force applied to the metal mask 101 will be different from the expected value, resulting in the uncontrollable net stretching process, thereby affecting the efficiency of the net stretching process.

[0044] Embodiment 1

[0045] Please refer to Figure 3 , is a schematic diagram of a single-side clamping mechanism of a web-stretching device provided in Embodiment 1 of the present invention, the clamping mechanism is used to clamp and apply tension to the metal mask during web-stretching. Figure 3As shown, the clamping mechanism 300 includes a plurality of clamping jaw bodies 301, which are located above the clamping jaw platform 302, with the front end being the upper side 303 and the lower side 305 of the clamping jaw head, and the bottom being connected to the guide rail 309 / 310 by the slider 307 / 308, and a connecting piece 313 being connected to the motor screw 311, and driven by the motor (not shown) via the motor screw 311 in the second direction. The clamping jaw platform 302 can be driven as a whole by the motor (not shown) in the second direction on the vibration reduction platform (not shown) of the net stretching device. Stabilizing mechanisms 315 / 316 are also provided at the bottom of the clamping jaw body 301, which are respectively located on both sides of the slider 307 / 308. Adsorption bases 317 / 318 are respectively provided on the lower side of the stabilizing mechanisms 315 / 316, and the adsorption bases 317 / 318 are fixed on the clamping jaw platform 302, and there is a certain gap between the adsorption bases 317 / 318 and the stabilizing mechanisms 315 / 316. In this embodiment, the adsorption base 317 / 318 is a block material composed of ferromagnetic material or ferrimagnetic material, and the stabilizing mechanism 315 / 316 is an electromagnetic control mechanism. Optionally, the material of the adsorption base 317 / 318 can be austenitic stainless steel or martensitic stainless steel with greater rigidity. Optionally, a connector made of non-ferromagnetic material or ferrimagnetic material can be provided between the adsorption base 317 / 318 and the clamp body 301. Optionally, there is no contact between the electromagnetic control mechanism 315 / 316 and the adsorption base 317 / 318, and the spacing between the electromagnetic control mechanism 315 / 316 and the adsorption base 317 / 318 is not greater than 500 microns and not less than 10 microns. Alignment marks 319 / 320 are respectively provided at the rear end and the front end of the top of the clamp body 301, which are used for the precise alignment of the clamp body 301 by the measurement system (not shown). The control and power supply cables 321 of the components in the clamp body 301 are connected to the lower side of the clamp platform 302 through the grooves 323 dug in the clamp platform.

[0046] Please refer to the synchronization Figure 4 , is a cross-sectional view 400 of the electromagnetic control mechanism 315 / 316, comprising a housing 401, a soft iron core 403 and a coil 405 / 406 inside the housing. The soft iron core 403 is a cylinder, a cuboid or other shape, and is installed inside the housing 401. The coil 405 / 406 is arranged around the soft iron core 403, and current can be passed through it. Optionally, a rubber protective layer can be provided on the outside of the coil 405 / 406. The two ends (not shown) of the coil 405 / 406 are introduced into the clamp body 301 through the through hole 407 / 408, and are connected to the lower side of the clamp platform 302 via the groove of the clamp platform. Optionally, only one through hole 407 can be provided, and the two ends (not shown) of the coil 405 / 406 are introduced into the clamp body from the through hole 407.

[0047] The following will be combined Figure 3 and Figure 4, the action of the clamping mechanism 300 during the net stretching process is described. The clamping mechanism 300 as a whole can be driven by a motor (not shown) connected below, and move along the second direction on the vibration reduction platform (not shown). The clamping jaw body 301 includes a clamping jaw head 303 / 305, which is driven by a motor (not shown) through a motor screw 311 along with a connecting piece 313 to accurately adjust the position in the second direction. The upper side 303 of the clamping jaw head can move along the third direction toward the lower side 305 of the clamping jaw head until it is clamped, and can clamp the metal mask; the upper side 303 of the clamping jaw head can also move upward along the third direction to loosen the clamping of the metal mask. When the current in the coil 405 / 406 of the electromagnetic control mechanism 315 / 316 is turned on, a magnetic field is generated, and the ferromagnetic block material or ferrimagnetic block material in the adsorption base 317 / 318 is magnetized and generates mutual attraction with the electromagnetic control mechanism 315 / 316, and the attraction enhances the stiffness between the clamp body 301 and the clamp platform 302; correspondingly, when the current is cut off, the magnetic field disappears, there is no interaction force between the adsorption base 317 / 318 and the electromagnetic control mechanism 315 / 316, and the stiffness between the clamp body 301 and the clamp platform 302 is restored to its original state.

[0048] The net stretching equipment provided in Example 1 of the present invention is provided with an electromagnetic control mechanism and an adsorption base that can generate mutual attraction between the clamping jaw body and the clamping jaw platform. The electromagnetic control mechanism is turned off when the clamping jaw body needs to move, and the electromagnetic control mechanism can be turned on when the clamping jaw body does not need to move. The generated attraction can enhance the rigidity between the clamping jaw body and the clamping jaw platform, and can eliminate the displacement and rotation of the clamping mechanism in the net stretching process, thereby improving the net stretching accuracy, and improving the net stretching efficiency and yield.

[0049] Embodiment 2

[0050] Please refer to Figure 5 , is a schematic diagram of a single-side clamping mechanism of a web-stretching device provided in the second embodiment of the present invention, and the clamping mechanism is also used to clamp and apply tension to the metal mask during the web-stretching process. Figure 5As shown, the clamping mechanism 500 includes a plurality of clamping jaw bodies 501, which are located above the clamping jaw platform 502, with the front end being the upper side 503 and the lower side 505 of the clamping jaw head, and the two sides of the bottom are connected to the guide rails 509 / 510 by the sliders 507 / 508, and there is another connecting piece 513 connected to the motor screw 511, and driven by the motor (not shown) via the motor screw 511 in the second direction. The clamping jaw platform 502 can be driven as a whole by the motor (not shown) in the second direction on the vibration reduction platform (not shown) of the net stretching device. Stabilizing mechanisms 515 and 516 are also provided at the bottom of the clamping jaw body 501, which are respectively located on both sides of the sliders 507 and 508. Adsorption bases 517 and 518 are respectively provided on the lower sides of the stabilizing mechanisms 515 and 516, and the adsorption bases 517 / 518 are fixed on the clamping jaw platform 502, and there is a certain gap between the adsorption bases 517 / 518 and the stabilizing mechanisms 515 / 516. In this embodiment, the stabilizing mechanism 515 / 516 is a block material composed of ferromagnetic material or ferrimagnetic material, and the adsorption base 517 / 518 is an electromagnetic control mechanism. Optionally, the material of the stabilizing mechanism 515 / 516 can be austenitic stainless steel or martensitic stainless steel with greater rigidity. Optionally, there is no contact between the stabilizing mechanism 515 / 516 and the electromagnetic control mechanism 517 / 518, and the spacing between the stabilizing mechanism 515 / 516 and the electromagnetic control mechanism 517 / 518 is not greater than 500 microns and not less than 10 microns. The control and power supply cables of the electromagnetic control mechanism 517 / 518 are connected to the lower side of the clamping platform 502 through the through holes 519 / 520 of the clamping platform. Alignment marks 521 / 522 are respectively set at the rear end and the front end of the top of the clamping body 501, which are used for the precise alignment of the clamping body 501 by the measurement system (not shown). The control and power supply cables 523 of the components in the clamp body 501 are connected to the lower side of the clamp platform 502 through the grooves 525 dug in the clamp platform.

[0051] Please refer to the synchronization Figure 6 , which is a cross-sectional view 600 of the adsorption base 517 / 518, includes a shell 601, multiple groups of soft iron cores 603 and multiple groups of coils 605 / 606 inside the shell. The soft iron core 603 is a cylinder, a cuboid or other shape, and is installed inside the shell 601. Each group of coils 605 / 606 is arranged around each corresponding group of soft iron cores 603. Current can be passed through one of the multiple groups of coils, or multiple groups or all of the multiple groups of coils. Optionally, a rubber protective layer can be provided on the outside of the coil 605 / 606. The two ends (not shown) of the coil 605 / 606 are introduced into the through hole 519 / 520 of the clamping platform from the through hole 607, and are connected to the lower side of the clamping platform 502 via the through hole 519 / 520 of the clamping platform.

[0052] The following will be combined Figure 5 and Figure 6, the action of the clamping mechanism 500 during the net stretching process is described. The clamping mechanism 500 as a whole can be driven by a motor (not shown) connected below, and move along the second direction on the vibration reduction platform (not shown). The clamping jaw body 501 includes a clamping jaw head 503 / 505, which is driven by a motor (not shown) through a motor screw 511 along with a connecting member 513 to accurately adjust the position in the second direction. The upper side 503 of the clamping jaw head can move along the third direction toward the lower side 505 of the clamping jaw head until it is clamped, and can clamp the metal mask; the upper side 503 of the clamping jaw head can also move upward along the third direction to loosen the clamping of the metal mask. When the current in the coil 605 / 606 of the electromagnetic control mechanism 517 / 518 is turned on, a magnetic field is generated, and the ferromagnetic block material or ferrimagnetic block material in the stabilizing mechanism 515 / 516 is magnetized and generates mutual attraction with the electromagnetic control mechanism 517 / 518, and the attraction increases the stiffness between the clamp body 501 and the clamp platform 502; correspondingly, when the current is cut off, the magnetic field disappears, there is no interaction force between the stabilizing mechanism 515 / 516 and the electromagnetic control mechanism 517 / 518, and the stiffness between the clamp body 501 and the clamp platform 502 is restored to its original state.

[0053] The net stretching equipment provided in the second embodiment of the present invention is provided with a stabilizing mechanism and an electromagnetic control mechanism that can generate mutual attraction between the clamping jaw body and the clamping jaw platform. The electromagnetic control mechanism is turned off when the clamping jaw body needs to move, and the electromagnetic control mechanism can be turned on when the clamping jaw body does not need to move. The generated attraction can enhance the rigidity between the clamping jaw body and the clamping jaw platform, and can eliminate the displacement and rotation of the clamping mechanism in the net stretching process, thereby improving the net stretching accuracy, and improving the net stretching efficiency and yield.

[0054] Please refer to Figure 7 The steps of using the stretching setting provided by the present invention to complete the stretching process of the metal mask are as follows:

[0055] Step 1: The transport system transports the metal mask frame to the mask frame platform, and transports the metal mask to the pre-alignment platform and performs pre-alignment;

[0056] Step 2: The clamping platform moves to both sides of the pre-alignment table, each clamping claw moves to a suitable position, and the upper side of the clamping claw head moves toward the lower side of the clamping claw head until the metal mask is clamped and a certain pulling force is applied, and then the flat jaw platform moves to the net stretching station;

[0057] Step 3: Each clamping jaw is fine-tuned to a suitable position on the clamping jaw platform;

[0058] Step 4: The measurement system grabs the alignment mark to confirm whether the position and parallelism of each gripper meet the specifications. If not, return to step 3. If yes, the electromagnetic coil is energized to generate a magnetic field, and the stabilizing mechanism and the adsorption base are adsorbed to each other;

[0059] Step 5: The measuring system detects again whether the position of each gripper reaches the specification. If not, the electromagnetic coil is first closed and the displacement to be compensated by the motor is given. The motor compensates according to the displacement and then opens the electromagnetic coil;

[0060] Step 6: Start the screen stretching process, align, measure and weld the metal mask;

[0061] Step 7: Turn off the electromagnetic base and determine whether all the nets have been stretched. If not, the transport system moves in a new metal mask and returns to step 2. If all the nets have been stretched, proceed to the next step.

[0062] Step 8: The transport system moves out the mask frame after the net is stretched.

[0063] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present invention are indicated by the following claims. It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A stretching device for stretching a metal mask and welding it to a mask frame, characterized in that: The net stretching device includes a clamping system, which includes a clamping platform, and multiple groups of clamping bodies, clamping heads, sliders, stabilizing mechanisms and adsorption bases located on the clamping platform; the clamping head is located at the front end of the clamping body, the clamping body is driven by a motor, and is slidably connected to the clamping platform through two sliders, the stabilizing mechanism is arranged below the clamping body and located on both sides of the slider, the adsorption base is installed on the clamping platform and located below the stabilizing mechanism, and the attraction between the stabilizing mechanism and the adsorption base controls the relative stability between the clamping body and the clamping platform; A measuring system, wherein the measuring system measures the position of the clamping jaws and the tension of the metal mask; A welding system, wherein the welding system is used to weld the metal mask to the mask frame; A motion system, which accurately positions and controls the gripper system, the welding system, and the measuring system; A pre-alignment stage, the pre-alignment stage is used to carry the metal mask and perform rough alignment; A mask frame platform, the mask frame platform carries the mask frame and positions it precisely; A vibration reduction platform, which carries the clamping system, the measuring system, the welding system, the motion system and the mask frame platform and reduces vibrations caused by the inside or outside of the net welding system; A handling system, wherein the handling system is used to carry in and out the metal mask and the mask frame; A control unit, the control unit is used to control the net-stretching process of the net-stretching device; There is no contact between the stabilizing mechanism and the adsorption base, and the distance between the stabilizing mechanism and the adsorption base is not greater than 500 microns and not less than 10 microns; The clamping jaw body is provided with positioning marks, which are located at the front end and the rear end of the clamping jaw body. The measuring system can accurately measure the positions of the positioning marks.

2. The net stretching device according to claim 1, characterized in that: The stabilizing mechanism is an electromagnetic control mechanism, and the adsorption base is a block material composed of ferromagnetic material or ferrimagnetic material.

3. The net stretching device according to claim 2, characterized in that: The electromagnetic control mechanism comprises a housing, an electromagnetic coil and a soft iron core. The electromagnetic coil surrounds the soft iron core and current can flow through the electromagnetic coil to generate a magnetic field.

4. The net stretching device according to claim 1, characterized in that: The stabilizing mechanism is a block material made of ferromagnetic material or ferrimagnetic material, and the adsorption base is an electromagnetic control mechanism.

5. The net stretching device according to claim 4, characterized in that: The electromagnetic control mechanism includes a shell, an electromagnetic coil group and a soft iron core group. The electromagnetic coil group includes multiple coils and can pass current to generate a magnetic field. The soft iron core group includes multiple soft iron cores, and the multiple soft iron cores are respectively located at the center of the multiple coils.

6. The net stretching device according to claim 5, characterized in that: The plurality of electromagnetic coils can be controlled separately, and current can be passed through one or more of the electromagnetic coils to generate a magnetic field.

7. The method for using the net stretching device according to claim 3 or 5, characterized in that: The following steps are involved: Step 1: the transport system transports the metal mask frame to the mask frame platform, and transports the metal mask to the pre-alignment platform and performs pre-alignment; Step 2: The clamping platform moves to both sides of the pre-alignment platform, and each clamping body moves to a suitable position. The clamping head clamps the metal mask and applies a certain pulling force, and then the clamping platform moves to the net stretching station; Step 3: fine-adjusting each of the clamping jaw bodies to a suitable position on the clamping jaw platform; Step 4: The measuring system grabs the positioning mark to confirm whether the position and parallelism of each clamp body meet the specifications. If not, return to step 3. If yes, the electromagnetic coil is energized to generate a magnetic field, and the stabilizing mechanism and the adsorption base are adsorbed to each other. Step 5: The measuring system detects again whether the position of each clamping jaw body meets the specification. If it does not meet the specification, the electromagnetic coil is first closed, and the displacement to be compensated by the motor is given. The motor compensates according to the displacement, and then the electromagnetic coil is opened; Step 6: Start the screen stretching process, align, measure and weld the metal mask; Step 7: Close the adsorption base and determine whether all the nets have been stretched. If not, the transport system moves in a new metal mask and returns to step 2. If all the nets have been stretched, proceed to the next step. Step 8: The transport system carries out the mask frame after the net is stretched.

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