CN108950475B

CN108950475B - Net tensioning structure, net tensioning device and net tensioning method

Info

Publication number: CN108950475B
Application number: CN201810826711.2A
Authority: CN
Inventors: 张浩瀚
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2018-07-25
Filing date: 2018-07-25
Publication date: 2020-11-10
Anticipated expiration: 2038-07-25
Also published as: CN108950475A

Abstract

The invention relates to a net tensioning structure, a net tensioning device and a net tensioning method, and belongs to the field of display panel manufacturing. This a net device includes: the device comprises two groups of net stretching structure groups which are oppositely arranged, wherein each group of net stretching structure group comprises at least one net stretching structure, each net stretching structure comprises a fixing frame and a rotatable roller arranged on the fixing frame, the side surfaces of the rollers of the two groups of net stretching structure groups are configured to be clamped with the target side surface of a frame formed with a fine metal mask plate FMM strip, and the target side surface is the side surface on which the FMM strip is arranged; the sliding structures are correspondingly connected with the fixing frames of the net stretching structures in the two net stretching structure groups, and each sliding structure is configured to drive the corresponding rolling shaft to slide on the side face of the target; when the side surfaces of the rolling shafts of the two net stretching structure groups slide relative to the target side surface, the side surfaces of the rolling shafts of the two net stretching structure groups exert counter forces for different positions of the target side surface. The present invention improves the accuracy of the formed FMM. The invention is used for the screen-spreading process in the manufacture of the display panel.

Description

Net tensioning structure, net tensioning device and net tensioning method

Technical Field

The invention relates to the field of display panel manufacturing, in particular to a net stretching structure, a net stretching device and a net stretching method.

Background

Organic Light Emitting Diode (OLED) display panels are becoming promising display products in the display field due to their advantages of all solid state, active Light emission, high contrast, ultra-thin, low power consumption, fast response speed, etc. In the production of OLED display panels, a Fine Metal Mask (FMM for short) used for evaporating an organic light emitting material onto a display substrate is an important device in the production process of OLED display panels.

Typically, a set of FMMs includes: the FMM comprises a frame, a supporting mask and a plurality of FMM strips, wherein the FMM is generally manufactured by adopting a screen-stretching technology, the screen-stretching process is a process of welding the supporting mask and the FMM strips to the frame, and when one FMM strip is welded, certain stretching Force (SF for short) is generated on the frame by the FMM strips, and the stretching Force can cause the frame to deform, so that the finally formed whole FMM deforms. To balance this tensile Force, a certain Counter Force (CF) is usually applied to the frame during the welding process. At present, a net-tensioning device is used to apply CF to a frame in a welding process, and the net-tensioning device includes a plurality of clamping members for clamping the frame and applying CF to the frame at a clamped position.

However, in the process of stretching the screen, when one FMM strip is welded, the tensile force applied to the frame changes, and the positions of the CFs applied to the frame by the plurality of clamping pieces are fixed, so that the SF can be balanced only by adjusting the CF, and the SF cannot be effectively balanced, so that the finally formed FMM has low precision.

Disclosure of Invention

In order to realize the purpose, the embodiment of the invention provides a net tensioning structure, a net tensioning device and a net tensioning method, which can solve the problem that the position of counter force applied to a frame by a clamping piece of the net tensioning device in the net tensioning process is fixed, and the tensile force generated by welding FMM strips to the frame cannot be effectively balanced, so that the finally formed FMM has lower precision, and the technical scheme is as follows:

according to a first aspect of embodiments of the present invention, there is provided a mesh tensioning device, including:

the device comprises two groups of net stretching structure groups which are oppositely arranged, wherein each group of net stretching structure group comprises at least one net stretching structure, each net stretching structure comprises a fixing frame and a rotatable roller arranged on the fixing frame, the side surfaces of the rollers of the two groups of net stretching structure groups are configured to be clamped with the target side surface of a frame formed with fine metal mask plate FMM strips, and the target side surface is the side surface on which the FMM strips are arranged;

the sliding structures are correspondingly connected with the fixing frames of the two net stretching structure groups, and each sliding structure is configured to drive the corresponding rolling shaft to slide on the target side;

and when the side surfaces of the rolling shafts of the two net-stretching structure groups slide relative to the target side surface, the side surfaces of the rolling shafts of the two net-stretching structure groups exert counter forces on different positions of the target side surface.

Optionally, the fixing frame includes a U-shaped structure, the U-shaped structure includes a first bar-shaped structure and two second bar-shaped structures located at two ends of the first bar-shaped structure and arranged in parallel, and two ends of the roller are movably connected with inner sides of the two second bar-shaped structures respectively.

Optionally, the mount includes the U-shaped structure, the U-shaped structure includes first bar structure, and is located two second bar structures of first bar structure both ends and parallel arrangement, the roller bearing includes dead axle and rotating ring, the both ends of dead axle with two second bar structures's inboard respectively fixed connection, the rotating ring cup joints outside the dead axle, can for the dead axle rotates.

Optionally, in each of the net-stretching structures, the fixing frame further includes a supporting frame, the supporting frame is fixedly connected to an outer side of at least one bar-shaped structure of the U-shaped structure, and each of the fixing frames is connected to the corresponding sliding structure through the supporting frame.

Optionally, each group of the mesh structures includes at least two mesh structures arranged in an array along a length direction of the target side.

Optionally, each sliding structure and the corresponding fixing frame are of an integral structure, or each sliding structure is detachably connected with the corresponding fixing frame.

Optionally, the web tensioning device further includes:

and each moving assembly is correspondingly connected with the fixed frame of each net structure in the two net structure groups, and is configured to drive the rolling shaft to move in a direction vertical to the side face of the target.

According to a second aspect of embodiments of the present invention, there is provided a sheet structure comprising:

the side face of the roller is configured to be clamped and connected with a target side face of a frame formed with FMM strips, and the target side face is the side face on which the FMM strips are arranged.

Optionally, the mesh structure further includes:

and the sliding structure is connected with the fixed frame and is configured to drive the corresponding rolling shaft to slide on the side face of the target.

According to a third aspect of the embodiments of the present invention, there is provided a web tensioning method applied to the web tensioning apparatus according to any one of the first aspect, the method including:

clamping the frame with the supporting mask plate in two oppositely arranged tensioning structure groups of a tensioning device, so that the side surfaces of rolling shafts of the two tensioning structure groups apply counter force to the target side surface of the frame to be provided with FMM strips, and the target side surface is the side surface of the FMM strips to be arranged;

after one FMM strip is welded each time, the sliding structure of the target tensioning structure is controlled to drive the corresponding roller to slide to a specified position on the side face of the target, and therefore the side face of the corresponding roller exerts a counterforce on the specified position.

The technical scheme provided by the embodiment of the invention can have the following beneficial effects:

the net tensioning structure, the net tensioning device and the net tensioning method provided by the embodiment of the invention can control the moving component of the net tensioning device to drive the roller to move in the direction perpendicular to the side face of the target of the frame before net tensioning so as to apply a certain counterforce to the frame before net tensioning, ensure that the frame does not deform before net tensioning, and simultaneously control the sliding structure in the net tensioning structure to drive the roller to move on the side face of the target welded with the FMM strip through the fixing frame connected with the sliding structure in the net tensioning process, apply the counterforce to the frame at different positions of the side face of the target, effectively balance the tensile force generated by the FMM strip on the frame when the FMM strip is welded, and improve the precision of the finally formed FMM.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.

Fig. 1 is a schematic view showing a structure of a conventional net-spreading device according to the related art;

FIG. 2 is a schematic diagram of a screening apparatus according to an exemplary embodiment;

FIG. 3 is a schematic structural diagram of a screening structure according to an exemplary embodiment;

FIG. 4 is a schematic illustration of a partial structure of a screening apparatus according to an exemplary embodiment;

FIG. 5 is a schematic illustration of a portion of yet another tensioning device according to an exemplary embodiment;

FIG. 6 is a schematic structural diagram of yet another tensioning device according to an exemplary embodiment;

FIG. 7 is a schematic structural view of yet another expanded web structure shown in accordance with an exemplary embodiment;

FIG. 8 is a flow chart illustrating a method of screening in accordance with an exemplary embodiment;

FIG. 9 is a flow diagram illustrating yet another method of screening in accordance with an exemplary embodiment;

FIG. 10 is a schematic diagram illustrating a partial top-down configuration of a frame according to an exemplary embodiment;

FIG. 11 is a deformation heat map of a framework shown in accordance with an exemplary embodiment;

FIG. 12 is a schematic diagram of a partial top view of yet another frame according to an exemplary embodiment;

FIG. 13 is a morphometric heat map of yet another framework shown in accordance with an exemplary embodiment;

FIG. 14 is a graph illustrating deformation of a frame according to an exemplary embodiment;

FIG. 15 is a difference plot illustrating a deformation curve of a frame according to an exemplary embodiment;

FIG. 16 is a schematic diagram illustrating a partial top view of another frame according to an exemplary embodiment;

FIG. 17 is a deformation heat map of another framework shown in accordance with an exemplary embodiment;

FIG. 18 is a graph illustrating deformation of yet another frame according to an exemplary embodiment;

FIG. 19 is a difference plot illustrating deformation curves for a frame according to an exemplary embodiment.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, fig. 1 is a schematic structural diagram of a conventional net tensioning device 0, the net tensioning device 0 includes a plurality of clamping members 01, during the FMM net tensioning process, the positions of the plurality of clamping members, which apply CF to a frame 2, are fixed, and every time an FMM strip is welded, the tension force applied to the frame 2 changes, so that the net tensioning device cannot effectively balance the tension force applied to the frame by welding the FMM strip, resulting in lower precision of the FMM that is finally formed.

An embodiment of the present invention provides a net tensioning device 1, as shown in fig. 2, the net tensioning device 1 includes:

two sets of the net structure sets 11 are oppositely arranged, and each set of the net structure sets 11 comprises at least one net structure 111. For example, each set of expanded structures may include at least two expanded structures arranged in an array along the length direction L1 of the target side w. Fig. 2 illustrates an example in which each set of sheet structures includes 3 sheet structures. As shown in fig. 3, each of the net-stretching structures 111 includes a fixing frame 111a, and a roller 111b rotatably provided on the fixing frame 111a, and sides of the rollers 111b of the two net-stretching structure groups 11 are configured to catch a target side W of the frame 2 on which the FMM strip is formed, as shown in fig. 2, the target side W being a side on which the FMM strip is disposed.

And the sliding structures 12 correspondingly connected with the fixed frames 111a of each of the two mesh structures 11, and each of the sliding structures 12 is configured to drive the corresponding roller 111b to slide on the target side W. Optionally, each sliding structure and the corresponding fixing frame can be integrated, that is, the two sliding structures and the corresponding fixing frame are produced in an integrated manner in the preparation and production process; each sliding structure can also be detachably connected with the corresponding fixed frame, namely the sliding structures and the fixed frame are respectively produced in the preparation and production process and are connected through the detachable structures. When the sliding structure is detachably connected with the corresponding fixed frame, the flexibility of the use of the net tensioning device can be improved. Optionally, each sliding structure is further provided with a braking structure for controlling the sliding structure to stop sliding when the sliding structure slides to the target position.

When the side surfaces of the rollers 111b of the two sets of the wire structure groups 11 slide with respect to the target side surface W, the side surfaces of the rollers 111b of the two sets of the wire structure groups 11 exert opposing forces on different positions of the target side surface W.

In summary, in the web tensioning device provided by the invention, in the web tensioning process, the device comprises two sets of web tensioning structures which are oppositely arranged, and the sliding structure of each web tensioning structure can drive the roller to slide on the target side surface of the frame through the fixing frame connected with the sliding structure, so that counterforces are applied to the frame at different positions of the target side surface, and the positions where the counterforces are applied are flexible and variable, so that the tensile force generated by the FMM strips on the frame when the FMM strips are welded is effectively balanced, and the precision of the finally formed FMM is improved.

In the embodiment of the present invention, the shape of the main body of the fixing frame may be various, for example, the main body of the fixing frame may be an L-shaped structure, a U-shaped structure or a ring-shaped structure, as long as it is ensured that the side surface of the roller may protrude from the main body of the fixing frame to contact with the target side surface and slide relative to the target side surface.

For example, in the embodiment of the present invention, the main body of the fixing frame is taken as a U-shaped structure, and the connection manner of structures with other shapes may refer to the U-shaped structure, which is not described in detail in the embodiment of the present invention. When the main body of the fixing frame is a U-shaped structure, please refer to fig. 4, the fixing frame includes the U-shaped structure X, and the U-shaped structure X includes a first bar-shaped structure X1 and two second bar-shaped structures X2 located at two ends of the first bar-shaped structure X1 and arranged in parallel. In this case, the connection manner of the roller and the U-shaped structure may be various, and the following two connection manners are exemplified in the embodiment of the present invention:

referring to fig. 4, fig. 4 is a schematic partial structure view of a net tensioning device according to an embodiment of the present invention, in which two ends of a roller 111b are movably connected to inner sides of two second bar-shaped structures x2, respectively. During the web-tensioning process, when the roller 111b in the web-tensioning structure slides on the target side W of the frame, the second strip-shaped structure x2 and both ends of the roller 111b move relatively, as the side of the roller 111b slides along the target side W of the frame.

Referring to fig. 5, fig. 5 is a partial schematic structural diagram of a net tensioning device according to an embodiment of the present invention, in which a roller 111b includes a fixed shaft y1 and a movable ring y2, two ends of the fixed shaft y1 are respectively and fixedly connected to inner sides of two second bar structures x2, and the movable ring y2 is sleeved outside the fixed shaft y1 and can rotate relative to the fixed shaft y 1. During the wire-stretching process, when the roller 111b in the wire-stretching structure slides on the target side W of the frame, the fixed shaft y1 and the movable ring y2 make relative movement, which is represented by the side of the roller 111b, i.e. the side of the movable ring y2 sliding along the target side W of the frame

Optionally, referring to fig. 4 and 5, in each net-opening structure, the fixing frame 111a further includes a supporting frame Z, the supporting frame Z is fixedly connected to an outer side of at least one strip-shaped structure of the U-shaped structure X, and each fixing frame 111a is connected to the corresponding sliding structure 12 through the supporting frame Z. It should be noted that, in the embodiment of the present invention, the support frame Z is exemplified to be fixedly connected to the outer side of the first bar-shaped structure X1 of the U-shaped structure X, and the support frame Z may also be fixedly connected to the outer side of the second bar-shaped structure X2, which is not limited in the present invention.

Further, as shown in fig. 6, the net tensioning device 1 may further include:

and a moving assembly 13 correspondingly connected to the fixed frame 111a of each of the two web structures 111 in the two web structure sets 11, wherein each moving assembly 13 is configured to move the corresponding roller 111b in a direction L2 perpendicular to the target side W. The moving assembly 13 can change the counter force exerted by the side of the roller on the target side by moving the corresponding roller 111b in the direction L2 perpendicular to the target side W. Optionally, each moving assembly is further provided with a braking structure for controlling the moving assembly to stop sliding when the moving assembly moves to the target position.

It should be noted that the sliding structure 12 and the moving assembly 13 corresponding to each tensioning structure 111 may be an integral structure, and both of the examples may be implemented by universal wheels. Furthermore, when the universal wheels are universal wheels, the universal wheels can be provided with braking structures, and when the universal wheels move to a target position, the braking structures work to control the universal wheels to stop moving, so that the universal wheels are accurately fixed at the target position, and the movement of the net stretching structure connected with the universal wheels is avoided.

An embodiment of the present invention provides a net structure 111, as shown in fig. 3, the net structure 111 includes:

a fixed frame 111a, and a roller 111b rotatably provided on the fixed frame 111a, a side of the roller 111b is configured to snap-fit a target side of a frame on which the FMM strip is formed, the target side being a side on which the FMM strip is disposed. Each sliding structure and the corresponding fixed frame are of an integral structure, or each sliding structure is detachably connected with the corresponding fixed frame.

The structure of the fixing frame may refer to the structure of the fixing frame in the net tensioning device, which is not described in detail in the embodiment of the present invention.

Further, as shown in fig. 7, the mesh structure 111 may further include:

a sliding structure 111c connected to the fixed frame 111a, the sliding structure 111c being configured such that the roller 111b slides on the target side.

Optionally, as shown in fig. 7, the net tensioning device further includes:

and a moving component 111d connected to the fixed frame 111a, wherein the moving component 111d is configured to move the roller 111b in a direction perpendicular to the target side.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of each component of the mesh stretching structure described above may refer to the corresponding processes in the foregoing mesh stretching device embodiments, and are not described herein again.

In summary, in the mesh stretching structure provided by the invention, in the mesh stretching process, the sliding structure of each mesh stretching structure can drive the rolling shaft to slide on the target side surface of the frame through the fixing frame connected with the sliding structure, so that counterforce is exerted on the frame at different positions of the target side surface, and the position for exerting the counterforce is flexible and variable, so that the tensile force generated by the FMM strip on the frame when the FMM strip is welded is effectively balanced, and the precision of the finally formed FMM is improved.

An embodiment of the present invention provides a web tensioning method, which may be applied to the web tensioning apparatus provided in the above embodiment, as shown in fig. 8, and the method includes:

step 301, clamping the frame formed with the supporting mask plate in two sets of oppositely arranged net stretching structure sets of the net stretching device, so that the side surfaces of the rolling shafts of the two sets of net stretching structure sets exert counter force on the target side surface of the frame to be formed with the FMM strips, and the target side surface is the side surface to be arranged with the FMM strips.

Step 302, after welding an FMM strip each time, controlling the sliding structure of the target tensioning structure to drive the corresponding roller to slide to the designated position on the side of the target, so that the side of the corresponding roller exerts a counter force for the designated position.

In summary, in the web tensioning method provided by the invention, in the web tensioning process, the sliding structure of each web tensioning structure can drive the roller to slide on the target side surface of the frame through the fixing frame connected with the sliding structure, so that counterforce is exerted on the frame at different positions of the target side surface, and the counterforce exerting positions are flexible and variable, so that the tensile force generated by the FMM strip on the frame when the FMM strip is welded is effectively balanced, and the precision of the finally formed FMM is improved.

An embodiment of the present invention provides a web tensioning method, which may be applied to the web tensioning apparatus provided in the above embodiment, as shown in fig. 9, and the method includes:

and step 401, simulating a screen tensioning process to obtain a simulation result.

Before the web tensioning process is executed, the web tensioning process is generally simulated by the control device to obtain a simulation result, so as to guide the subsequent web tensioning process based on the simulation result. Since the screening process is a welding process for a plurality of FMM strips, the simulation process is a simulation of the welding process for the plurality of FMM strips, for example, the simulation result may include: after each FMM strip is welded, the number n of target expanded mesh structures needing to be moved in the mesh tensioning device, the designated position t to which each target expanded mesh structure needs to be moved, and the target counterforce f, exerted on the side face of the target by each target expanded mesh structure at the designated position, are calculated. Alternatively, the control device may be a data processing device such as a computer. Different FMM strips may be distinguished by their welding positions, and in the simulation result, each FMM strip may be identified by coordinate values representing its welding position, which may be coordinate values in a plane coordinate system established in a plane in which the frame is located.

The method has the advantages that after one FMM strip is welded, a target net stretching structure can be directly moved to a specified position and controlled to apply target counter force to the side face of a target after the FMM strip is welded based on the simulation result, manual multiple debugging is not needed, and net stretching efficiency is improved on the basis of effectively balancing tensile force generated by welding the FMM strips on a frame.

Step 402, clamping the frame formed with the supporting mask plate in two sets of oppositely arranged net stretching structure sets of the net stretching device, so that the side surfaces of rolling shafts of the two sets of net stretching structure sets exert counter force for the target side surface of the frame to be formed with the FMM strips, and the target side surface is the side surface to be arranged with the FMM strips.

After the supporting mask is welded on the frame, the frame with the supporting mask can be clamped in two sets of oppositely arranged net-stretching structure sets of the net-stretching device, at this time, referring to fig. 6, the moving assemblies 13 in the two sets of net-stretching structure sets 11 can drive the roller to move in a direction L2 perpendicular to the side surface of the target, so that the side surface of the roller exerts a certain counter force on the frame, wherein the side surface of the target is the side surface on which the FMM strips are to be arranged.

In the embodiment of the invention, the net tensioning device has two states, wherein one state is an initial state, the other state is a moving state, the net tensioning device in the initial state is provided with each net tensioning structure at a pre-designated initial position, and at the moment, a plurality of net tensioning structures of each net tensioning structure group are arranged at equal intervals; the position of at least one net stretching structure of the net stretching device in the moving state is not an initial position any more, but moves to a specified position of the side of the target according to specific conditions.

In the time period from the welding of the supporting mask plate on the frame to the completion of the welding of the first FMM strip, the net tensioning device can be in an initial state, and the frame with the supporting mask plate can be ensured not to deform before the first FMM strip is welded; after the first FMM bar is welded, the tenter device is in motion to provide different counter forces for different periods of the frame.

And step 403, controlling the sliding structure of the target tensioning structure to drive the corresponding roller to slide to the specified position on the side surface of the target after welding one FMM strip each time based on the simulation result, so that the side surface of the corresponding roller exerts counter force for the specified position.

After the frame with the supporting mask is clamped in the screen stretching device, the welding of the FMM strips can be started. As shown in step 401, different FMM strips can be distinguished by their welding positions, and after welding each FMM strip, the control device can detect the welding position of the FMM strip on the frame by the detection device (for example, obtain coordinate values of the welding position in a plane coordinate system established in a plane of the frame), and query the pre-obtained simulation result based on the welding position to obtain a query result, where the query result includes: after the FMM strips are welded, the number n of target expanded mesh structures needing to be moved in the mesh tensioning device, the designated position t to which each target expanded mesh structure needs to be moved, and the target counterforce f, exerted on the target side face by each target expanded mesh structure at the designated position, are determined. The control device can control a target net tensioning structure in the net tensioning device to adjust the sliding structure to move according to the query result, so that the target net tensioning structure drives the corresponding roller to slide to the specified position on the side face of the target, and the side face of the corresponding roller exerts counter force on the specified position.

And step 404, adjusting the counter force exerted by the side surface of the corresponding roller to the appointed position.

After the target tensioning structure slides to the designated position, the control device adjusts the counterforce exerted on the target side face of the frame by the target tensioning structure at the designated position according to the query result, and the adjusted counterforce is the target counterforce f.

Alternatively, the control device may adjust the counterforce exerted by the target expanded mesh structure on the target side surface of the frame by controlling the movement of the moving component of the target expanded mesh structure, for example, controlling the moving component to move close to the target side surface (i.e. move in a direction perpendicular to the target side surface and toward the target side surface), and the roller of the target expanded mesh structure to press the target side surface tightly, so as to increase the counterforce exerted by the target expanded mesh structure on the target side surface of the frame; the control moving assembly moves away from the target side (namely, moves along the direction vertical to the target side and away from the target side), the contact between the roller of the target tensioning structure and the target side is reduced, and the counter force exerted by the target tensioning structure on the target side of the frame can be reduced.

Step 405, when all the FMM bars are welded, the screen tensioning device is removed.

For example, as shown in fig. 10, fig. 10 is a partial top view schematic diagram of a frame, and it is assumed that two FMM strips are welded at positions J and K of the frame, where the two FMM strips cause deformation of the frame due to SF that generates asymmetric distribution on the frame, and a deformation thermal map of the frame is shown in fig. 11, where the deformation thermal map is used to reflect, through thermal effect, the amount of deformation of the frame due to SF that the frame is subjected to after the FMM strips are welded. In the deformation heat map, the larger the deformation amount of the frame is, the darker the color corresponding to the thermal effect is; the smaller the deformation amount of the frame, the lighter the color corresponding to the thermal effect. As can be seen from fig. 11, since the colors on the frame are asymmetrically distributed, the frame deformation caused by SF is asymmetrically distributed, and at this time, SF received by the frame is also asymmetrically distributed. Fig. 10 and 11 use the same planar coordinate system, where X represents the horizontal axis direction of the planar coordinate system, and Y represents the vertical axis direction of the planar coordinate system.

If the SF is balanced by using the conventional net tensioning device, as shown in fig. 12, fig. 12 is a partial schematic top view of a frame, and the force application position of the clip of the conventional net tensioning device to the frame is fixed, CF can be applied only at positions 1/4, 2/4 and 3/4 on the target side of the frame, that is, at positions M1, M2 and M3 in fig. 12, please refer to fig. 13, and fig. 13 is a deformation thermal map reflecting the deformation of the frame caused by CF. As can be seen from fig. 13, the colors on the frame are symmetrically distributed, and at this time, the deformation of the frame caused by CF is symmetrically distributed, so the CF received by the frame is also symmetrically distributed. Fig. 12 and 13 use the same planar coordinate system, where X denotes a horizontal axis direction of the planar coordinate system, and Y denotes a vertical axis direction of the planar coordinate system.

Fig. 14 shows a deformation curve corresponding to fig. 12, which reflects the deformation of the frame caused by SF and CF. As can be seen from fig. 14, when the conventional mesh stretching device is used, the deformation curves of the frame deformed by SF and CF do not completely coincide with each other. FIG. 15 is a graph showing the difference between the deformation curves of the SF and CF in FIG. 14, wherein the horizontal axis represents the deformation position of the frame, the vertical axis represents the deformation difference caused by the corresponding positions of the CF and SF on the frame, and the highest peak position in FIG. 15 represents the maximum difference of the deformation caused by the SF generated by the CF and FMM strips applied by the conventional stretching device on the target position of the frame, so that it can be seen that the frame can still be deformed by 8.00X 10 by using the conventional stretching device^-4mm deformation.

Continuing with the example of fig. 10 in which two FMM strips are welded at the J and K positions of the frame, if the SF is balanced by using the tensioning device provided in the embodiment of the present invention, the control device of the tensioning device controls the target tensioning structure to perform position adjustment and adjustment of the applied CF according to the J and K positions of the two welded FMM strips, as shown in fig. 16, the control device determines a group of tensioning structures as the target tensioning structure based on the simulation result, and simultaneously moves a plurality of target tensioning structures to the designated positions N1, N2 and N3 instead of 1/4, 2/4 and 3/4 on the target side of the frame. Referring to fig. 17, it can be seen from fig. 17 that the colors of the frame are asymmetrically distributed, so that the frame deformation caused by the CF is asymmetrically distributed, and the CF received by the frame is asymmetrically distributed. Fig. 16 and 17 use the same planar coordinate system, where X denotes a horizontal axis direction of the planar coordinate system, and Y denotes a vertical axis direction of the planar coordinate system.

Fig. 18 shows a deformation curve corresponding to fig. 16, which reflects the deformation caused by SF and CF to the frame, wherein the horizontal axis represents the deformation position of the frame, and the vertical axis represents the deformation amount of the corresponding position of the frame, and as can be seen from fig. 18, the deformation curves of SF and CF to the frame are almost completely overlapped by using the mesh stretching device provided by the embodiment of the present invention. Fig. 19 is a graph showing the difference between the deformation curves of the SF and the CF in fig. 18, in which the horizontal axis represents the deformation position of the frame, the vertical axis represents the deformation difference caused by the corresponding positions of the frame, CF and SF, to the frame, and the highest peak position in fig. 19 represents the maximum difference between the deformation of the frame caused by the SF generated by the target position of the frame by the CF and FMM strips applied by the tensioning device according to the embodiment of the present invention, and at this time, it can be seen that the deformation device according to the embodiment of the present invention only causes 2.00 × 10 deformation to the frame^-4mm deformation.

As can be seen from fig. 10 to 19, after the same number of FMM strips are welded to the frame, CF applied by the tensioning device provided in the embodiment of the present invention cancels (also referred to as equivalent) SF generated by the FMM strips on the target position of the frame, and the resulting frame deformation is 2.00 × 10^-4mm, after CF applied by the existing net tensioning device and SF generated by FMM strips on the target position of the frame are counteracted, the frame deformation caused by the counteraction is 8.00 multiplied by 10^-4mm, frame deformation 2.00X 10^-4mm is obviously less than 8.00 multiplied by 10^-4mm, it can be seen that the deformation of the frame caused by the CF application manner of the web tensioning device provided in the embodiment of the present invention can be almost completely equivalent to the deformation of the frame caused by SF generated by the FMM strip, thereby improving the accuracy of the FMM finally formed.

In summary, the method for stretching a web provided by the embodiment of the invention can control the moving assembly to drive the roller to move in the direction perpendicular to the target side of the frame before stretching the web so as to apply a certain counterforce to the frame, thereby ensuring that the frame is not deformed before stretching the web, and meanwhile, in the process of stretching the web, the sliding structure in the web stretching structure can be controlled to drive the roller to move on the target side welded with the FMM strip through the fixing frame connected with the sliding structure, and the counterforce is applied to the frame at different positions of the target side, thereby effectively balancing the tensile force generated by the FMM strip on the frame when welding the FMM strip, and improving the accuracy of the FMM finally formed.

It should be noted that, in the embodiment of the present invention, the frames in fig. 1, fig. 2, and fig. 6 are at least provided with a supporting mask, and may also be provided with at least one FMM strip, but the frames are not depicted and do not indicate that there is no mask in the frame.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

1. A web spreading apparatus, comprising:

when the side surfaces of the rolling shafts of the two net stretching structure groups slide relative to the target side surface, the side surfaces of the rolling shafts of the two net stretching structure groups apply counter forces to different positions of the target side surface;

the net tensioning device further comprises:

2. A screening arrangement according to claim 1,

the fixing frame comprises a U-shaped structure, the U-shaped structure comprises a first strip-shaped structure and two second strip-shaped structures which are arranged at two ends of the first strip-shaped structure in parallel, and two ends of the rolling shaft are movably connected with the inner sides of the two second strip-shaped structures respectively.

3. A screening arrangement according to claim 1,

the fixing frame comprises a U-shaped structure, the U-shaped structure comprises a first bar-shaped structure and two second bar-shaped structures which are arranged at two ends of the first bar-shaped structure in parallel, the rolling shaft comprises a fixed shaft and a movable ring, two ends of the fixed shaft are fixedly connected with the inner sides of the two second bar-shaped structures respectively, and the movable ring is sleeved outside the fixed shaft and can rotate relative to the fixed shaft.

4. A screening arrangement according to claim 2 or 3,

in each net-opening structure, the fixing frame further comprises a supporting frame, the supporting frame is fixedly connected with the outer side of at least one strip-shaped structure of the U-shaped structure, and each fixing frame is connected with the corresponding sliding structure through the supporting frame.

5. A screening arrangement according to claim 1,

each group of the net-stretching structure group comprises at least two net-stretching structures which are arranged in an array along the length direction of the side face of the target.

6. A screening arrangement according to claim 1,

each sliding structure and the corresponding fixed frame are of an integral structure, or,

each sliding structure is detachably connected with the corresponding fixed frame.

7. A wire netting structure for use in the wire netting device according to any one of claims 1 to 6, comprising:

8. The tensioning structure according to claim 7, characterized in that it further comprises:

9. A web tensioning method, characterized in that the method is applied to the web tensioning device according to any one of claims 1 to 6, and the method comprises the following steps:

after one FMM strip is welded each time, the sliding structure of the target net stretching structure is controlled to drive the corresponding roller to slide to the specified position on the side face of the target, and the side face of the corresponding roller is adjusted to apply counter force to the specified position by controlling the movement of the moving assembly of the target net stretching structure.