A welding fixture

Abstract

This invention relates to the field of processing fixture technology, specifically a welding fixture for welding products. The product includes an inner layer and an outer layer that are fitted together, and a folding area in the middle of the product. The welding fixture includes: a base; a folding plate disposed on one side of the base and connected thereto; the folding plate includes a first placement part and a second placement part, the portions of the product located on both sides of its folding area are respectively placed in the first placement part and the second placement part, and the inner layer is fitted together with the folding plate; a folding shaft disposed corresponding to the folding area, the folding shaft including a first shaft and a second shaft that rotate synchronously in opposite directions, the first placement part being connected to the first shaft, and the second placement part being connected to the second shaft; and a wind power output component disposed on the base, which applies force towards the outer layer during the product folding process to make the inner and outer layers fit together, and holds the outer layer of the product with continuous wind power output pressure to prevent the outer and inner layers from separating.

Description

Technical Field

[0001] This invention relates to the field of machining fixture technology, and in particular to a welding fixture. Background Technology

[0002] The reliability of foldable screens is highly dependent on the precision of hinge welding and the quality of interlayer bonding. Dynamic fatigue testing after the foldable screen and hinge are welded is a key step in verifying product reliability.

[0003] Foldable screens are typically constructed from multiple layers of composite materials (such as a UTG ultrathin glass layer and a polymer adhesive layer). They consist of an outer protective layer (made of polyimide) and an inner base layer (made of flexible composite materials). During fatigue testing, a fixture is used to simulate opening and closing actions (1-2 times / second) to record the crack propagation length and hinge torque decay, thereby measuring the durability limits of the hinge and screen. In fatigue testing of foldable screens, multiple mechanical bending processes are required. During bending, the multi-layer composite materials generate shear stress due to the difference in thermal expansion coefficients. At high temperatures, the adhesive layer connecting the inner and outer layers softens and accelerates delamination, affecting the interlayer bonding quality. This can lead to the inner and outer layers separating, resulting in a delamination effect. Therefore, there is a problem that the high temperature generated by mechanical energy during fatigue testing can cause the foldable screen to delaminate and fail during the test. Summary of the Invention

[0004] Therefore, the purpose of this invention is to overcome the problem in the prior art where high-temperature mechanical energy generated during fatigue testing of foldable screens after welding causes delamination between the inner base layer and the outer protective layer. This invention provides a welding fixture that applies wind pressure during dynamic fatigue testing of foldable screens, simultaneously pressing the inner and outer layers to prevent structural delamination and separation.

[0005] To solve the above-mentioned technical problems, the present invention provides a welding fixture for welding products, the products including an inner layer and an outer layer that are fitted together, and the middle part of the products having a folded area. The welding fixture includes:

[0006] Base;

[0007] A folding plate is disposed on one side of the base and connected thereto; the folding plate includes a first placement part and a second placement part, the portions of the product located on both sides of its folding area are respectively placed in the first placement part and the second placement part, and the inner layer is placed against the folding plate;

[0008] A folding hinge is provided corresponding to the folding area. The folding hinge includes a first hinge and a second hinge that rotate synchronously in opposite directions. The first placement part is connected to the first hinge, and the second placement part is connected to the second hinge.

[0009] A wind power output component is mounted on the base, and the wind power output component outputs pressure through wind power;

[0010] The folding pivot rotates to drive the product to fold along the folding area, and the wind output component applies force toward the outer layer during the product folding process to make the inner layer and the outer layer fit together.

[0011] In one embodiment of the present invention, a linkage component is further included, which is respectively connected to the folding plate and the wind power output component. The folding plate rotates and drives the force application angle of the wind power output component to change through the linkage component.

[0012] In one embodiment of the present invention, the linkage component includes,

[0013] A linkage wire, one end of which is connected to the folding plate;

[0014] A rotating plate is rotatably connected to the base via a rotating shaft. The rotating plate and the wind power output component are fixed. The other end of the linkage wire is connected to the rotating plate, and the linkage wire pulls the rotating plate to rotate axially around the rotating shaft.

[0015] In one embodiment of the present invention, a torsion spring is provided on the rotating shaft, and the torque of the torsion spring drives the rotating plate to return to a horizontal state.

[0016] In one embodiment of the present invention, the base is provided with a linkage groove for accommodating the linkage wire, and the surface roughness of the inner wall of the linkage groove is in the range of 20μm-50μm.

[0017] In one embodiment of the present invention, the wind power output component includes a plurality of nozzles arranged in a linear array. The wind power output component also includes several elastic air pipes connected to each of the nozzles. The nozzles and the rotating plate are fixed. Several air inlets are provided on the base. Each elastic air pipe is connected to one of the air inlets.

[0018] In one embodiment of the invention, the nozzle is connected to a cooling device for reducing the temperature of the airflow ejected from the nozzle.

[0019] In one embodiment of the present invention, a curvature detection sensor facing the product is provided at the end of the nozzle.

[0020] In one embodiment of the present invention, a limiting groove is provided on the folding plate, and a slot that abuts against the product is provided on the groove wall of the limiting groove. The pressure output by the wind power output component squeezes the outer layer of the product and the inner wall of the slot applies pressure to the inner layer of the product.

[0021] In one embodiment of the present invention, a buffer layer is provided in the card slot.

[0022] Compared with the prior art, the above-described technical solution of the present invention has the following advantages:

[0023] The welding fixture described in this invention achieves the dynamic fatigue test process by folding the product on the base. During the dynamic fatigue test, the inner and outer surfaces of the folding screen are subjected to force to achieve the pressure function of the inner and outer layers of the folding screen, and the force between the inner and outer layers is continuously maintained. Even if the adhesive layer between the inner and outer layers melts at high temperature, the inner and outer layers will not detach.

[0024] The device includes a wind output component that continuously applies pressure via wind. When the folding plate rotates and folds the product, the wind output port of the wind output component blows air towards the outer layer of the product. The thrust generated by the high-pressure wind pushes the inner and outer layers of the product to be continuously clamped together. Under the pressure of the wind, the inner and outer layers of the product will be continuously subjected to pressure during the folding process of the folding plate, and there will be no separation. Attached Figure Description

[0025] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the structure of a welding fixture in a preferred embodiment of the present invention;

[0027] Figure 2 This is a cross-sectional schematic diagram of the present invention;

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 This is a schematic diagram of the structure of the wind power output component and linkage assembly in a preferred embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of a welding fixture in a preferred embodiment of the present invention. Figure 2 ;

[0031] Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0032] Explanation of reference numerals on the accompanying drawings:

[0033] 1. Base;

[0034] 2. Folding plate; 21. First placement part; 22. Second placement part; 23. Limiting groove; 24. Slot;

[0035] 3. Folding hinge; 31. First hinge; 32. Second hinge;

[0036] 4. Air output components; 41. Nozzle; 42. Flexible air hose; 43. Air inlet;

[0037] 5. Linkage components; 51. Linkage wire; 52. Rotating plate; 53. Linkage groove. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0039] The purpose of this invention is to provide a welding fixture so that after the product is placed and welded, the product on the folding plate 2 is subjected to wind pressure by the wind output component 4. The continuous pressure of the wind ensures that the outer and inner layers of the folding screen remain in contact during fatigue testing involving repeated folding. Even if the product's local temperature rises during fatigue testing and the adhesive layer connecting the inner and outer layers melts, the pressure of the wind will still hold the inner and outer layers together, maintaining a constant distance between them. This prevents either the inner or outer layer from detaching from the adhesive layer. After the fatigue test, when the adhesive layer cools, the inner and outer layers remain bonded and will not detach.

[0040] refer to Figure 1 , 2 3. A welding fixture is provided for welding a product, which includes an inner layer and an outer layer that are fitted together, and a folding area in the middle of the product. The welding fixture includes: a base 1; a folding plate 2, which is disposed on one side of the base 1 and connected thereto; the folding plate 2 includes a first placement part 21 and a second placement part 22, the parts of the product located on both sides of its folding area are respectively placed on the first placement part 21 and the second placement part 22, and the inner layer is fitted together with the folding plate 2; a folding shaft 3, which is disposed corresponding to the folding area, the folding shaft 3 includes a first shaft 31 and a second shaft 32 that rotate synchronously in opposite directions, the first placement part 21 is connected to the first shaft 31, and the second placement part 22 is connected to the second shaft 32; a wind power output component 4, which is disposed on the base 1, and the wind power output component 4 outputs pressure through wind power; wherein, the folding shaft 3 rotates to drive the product to fold along the folding area, and the wind power output component 4 applies force toward the outer layer during the product folding process to make the inner layer and the outer layer fit together.

[0041] refer to Figure 1 , 23. In the manufacturing process of foldable screens, welding is required between the hinge and the main screen. Therefore, the hinge and main screen need to be placed on a welding fixture. After welding, the hinge and main screen are assembled into a product. The hinge and main screen are connected by welding. The main screen consists of an inner layer and an outer layer, which are connected by an adhesive layer. After welding, fatigue durability testing of the foldable screen is required, involving multiple bending tests on the main screen. Therefore, a welding fixture is set up, including a base 1, on which a folding plate 2 is placed. The folding plate 2 is divided into... The first placement part 21 and the second placement part 22 are provided with a first rotating shaft 31 and a second rotating shaft 32 between them. The first placement part 21 is connected to the first rotating shaft 31, and the second placement part 22 is connected to the second rotating shaft 32. The axes of the first rotating shaft 31 and the second rotating shaft 32 are collinear. The first placement part 21 and the second placement part 22 are folded with the axes of the first rotating shaft 31 and the second rotating shaft 32 as the folding area. When the first rotating shaft 31 and the second rotating shaft 32 rotate, they drive the first placement part 21 and the second placement part 22 to move in a circular motion and move closer to each other.

[0042] refer to Figure 1 , 2 3. Wind placement slots are opened on the base corresponding to the surfaces of the first placement part 21 and the second placement part 22 respectively. A wind output component 4 is rotatably installed in the wind placement slot. The wind output component 4 continuously blows air through an external high-pressure fan and applies pressure through the blown airflow. When the folding shaft 3 drives the first placement part 21 and the second placement part 22 to rotate simultaneously, the wind output component 4 outputs airflow to blow air onto the outer layer of the main screen placed on the first placement part 21 and the second placement part 22, driving the inner and outer layers of the main screen to move closer to each other, keeping the distance between the inner and outer layers of the product constant. When the product is folded multiple times and the internal temperature rises, causing the adhesive layer between the inner and outer layers to melt, because the distance between the inner and outer layers of the product remains constant, there will be no separation phenomenon. The inner and outer layers are still bonded by the adhesive layer. After the test is completed, the internal temperature of the product drops, the adhesive layer cools and solidifies, and the adhesive effect between the inner and outer layers can be restored.

[0043] refer to Figure 1 , 4 5, 6, The folding plate 2 is provided with a limiting groove 23. The groove wall of the limiting groove 23 is provided with a slot 24 that abuts against the product. The pressure output by the wind power output component 4 squeezes the outer layer of the product and the inner wall of the slot 24 applies pressure to the inner layer of the product. A buffer layer is provided inside the slot 24.

[0044] refer to Figure 1 , 45, 6. To ensure that the force output direction of the wind power output component 4 is from the outer layer to the inner layer, a limiting groove 23 is set on the folding plate 2, and a slot 24 is set on the groove wall of the limiting groove 23. When the air pressure ejected by the wind power output component 4 reaches the outer layer of the product, it applies a thrust to the outer layer of the product. At this time, the product is limited in the slot 24. Therefore, the inner surface of the product also applies a pressure in the same direction as the thrust to the inner wall of the slot 24. The inner wall of the slot 24 reacts to the reaction force of the inner surface of the product. It and the thrust form a clamping force between the outer layer and the inner layer of the adhesive layer. Thus, by clamping, the outer layer and the inner layer are restricted from moving away from each other, thereby preventing the outer layer and the inner layer from separating due to the melting of the adhesive layer. A buffer layer is bonded to the inner wall of the slot 24. The buffer layer is made of sponge material to reduce the rigid extrusion force of the rigid material of the inner wall of the slot 24 on the surface of the folding screen, forming a buffering effect and preventing the inner surface of the screen from being damaged under pressure.

[0045] refer to Figure 1 , 4 5, 6, also include a linkage component 5, which is connected to the folding plate 2 and the wind power output component 4 respectively. The folding plate 2 rotates and drives the wind power output component 4 to change the force angle through the linkage component 5. The linkage component 5 includes a linkage wire 51, one end of which is connected to the folding plate 2; a rotating plate 52, which is rotatably connected to the base 1 through a rotating shaft. The rotating plate 52 and the wind power output component 4 are fixed. The other end of the linkage wire 51 is connected to the rotating plate 52. The linkage wire 51 pulls the rotating plate 52 to rotate around the axis of the rotating shaft.

[0046] refer to Figure 1 , 4 5, 6. A linkage component 5 is set up. The linkage component 5 includes a linkage wire 51. One end of the linkage wire 51 is fixed to the bottom of the folding plate 2. A rotating plate 52 is also rotatably set on the base 1. The rotating plate 52 is set in the placement groove through a rotating shaft. The wind power output component 4 is fixed to the bottom of the rotating plate 52. The other end of the linkage wire 51 is fixed to the bottom of the rotating plate 52. When the folding plate 2 rotates, it pulls the linkage wire 51 to move. At this time, the rotating plate 52 rotates around its rotating shaft under the pull of the linkage wire 51, which drives the wind power output component 4 fixed to the rotating plate 52 to rotate synchronously. This causes the blowing angle of the wind power output component 4 to change, and the pressure position of the airflow on the outer layer of the product also changes, so as to achieve the effect of air pressure sweeping on the outer surface of the product.

[0047] refer to Figure 1 , 4 5, 6, A torsion spring is installed on the rotating shaft. The torque of the torsion spring drives the rotating plate 52 to return to the horizontal state.

[0048] refer to Figure 1 , 45, 6. A torsion spring is fixed at the pivot. When the rotating plate 52 is offset, the torsion of the torsion spring applies a spring force to the rotating plate 52 to drive it to reset. As a result, when the folding plate 2 is reset, the rotating plate 52 also returns to its initial position under the action of the torsion spring. This achieves the effect of the rotating plate 52 adjusting its angle synchronously with the rotation of the folding plate 2, forming a synchronous linkage function.

[0049] refer to Figure 1 , 4 5, 6, The base 1 is provided with a linkage groove 53 to accommodate the linkage wire 51. The surface roughness of the inner wall of the linkage groove 53 is in the range of 20μm-50μm.

[0050] refer to Figure 1 , 4 5, 6. A linkage groove 53 is provided on the base 1 to accommodate the linkage wire 51, thus hiding the movement trajectory of the linkage wire 51 and preventing the movement of the linkage wire 51 from affecting the detection process. The inner wall of the linkage groove 53 is polished by a grinding machine to a smooth surface with a roughness range of 20μm-50μm, so as to prevent the roughness of the inner wall of the linkage groove 53 from affecting the transmission of force of the linkage wire 51 to the rotation of the folding plate 2.

[0051] refer to Figure 1 , 4 5, 6, The wind power output component 4 includes multiple nozzles 41 arranged in a linear array. The wind power output component 4 also includes several flexible air tubes 42 connected to each nozzle 41. The nozzles 41 and the rotating plate 52 are fixed. Several air inlets 43 are provided on the base 1. Each flexible air tube 42 is connected to an air inlet 43. The nozzles 41 are connected to a refrigeration device, which is used to reduce the temperature of the airflow ejected from the nozzles 41. A curvature detection sensor facing the product is provided at the end of the nozzles 41.

[0052] refer to Figure 1 , 45, 6, The wind power output component 4 includes three nozzles 41 arranged in a linear array and all at the same plane height, further ensuring that the airflow ejected through the three nozzles 41 has a linear range. The range of force exerted by the airflow ejected by the nozzles 41 on the outer surface of the product can be adjusted by increasing the gas pressure of the external air pressure device connected to the nozzles 41. The higher the output air pressure of the external air pressure device, the smaller the range of force exerted by the airflow ejected by the nozzles 41. When the wind power output component 4 applies force by sweeping, the smaller the range of force exerted, the higher the accuracy of the applied force. An air inlet 43 connected to the external air pressure device is provided on the base 1, and an elastic air tube 42 is connected to the nozzles 41. 2 is a rubber tube, and the elastic air tube 42 is connected to an external air pressure device. When the nozzle 41 rotates to change the spray angle under the drive of the rotating plate 52, the elastic air tube 42 deforms under the elastic force of its own rubber material, which can cooperate with the nozzle 41 to change its spray angle. A cooling device can be connected to the nozzle 41 to reduce the temperature of the airflow sprayed from the nozzle 41, thereby reducing the temperature between the outer and inner layers of the product and reducing the degree of melting of the adhesive layer between the outer and inner layers. A curvature detection sensor is set at the end of the nozzle 41 and connected to the inside of the nozzle 41. The cross-sectional area of ​​the airflow outlet of the nozzle 41 is switched according to the change of curvature of the outer surface of the product opposite the nozzle 41, further improving the accuracy of the force applied by the nozzle 41 to the outer surface.

[0053] When using the welding fixture, the hinge and screen surface of the folding screen are placed on the base 1. Welding is then performed to weld the hinge and main screen into a single product. After welding, a fatigue test of the folding screen is conducted. The two ends of the folding screen are respectively inserted into the slots 24. The first rotating shaft 31 and the second rotating shaft 32 are synchronously driven by the drive source, causing the folding screen to shift. The first placement part 21 and the second placement part 22 fold around the axis of the first rotating shaft 31 and the second rotating shaft 32. When the folding plate 2 folds, the linkage 51 pulls the bottom of the rotating plate 52, causing the rotating plate 52 to rotate and change the angle of the nozzle 41. At this time, the external air pressure equipment is activated, outputting high-pressure airflow, which is sprayed onto the outer surface of the folding screen through the nozzle 41. Because the folding screen... The card slot 24 is in the inner limit position. At this time, the outer layer and the inner layer form a clamping pressure on the adhesive layer between the outer layer and the inner layer under the airflow pressure of the nozzle 41. After multiple folds, the temperature of the adhesive layer rises under the action of mechanical energy, and the adhesive layer melts. At this time, under the action of clamping pressure, the distance between the outer layer and the inner layer fluctuates within a small range, and the adhesive layer connecting the outer layer and the inner layer does not break. Consequently, the outer layer and the inner layer will not detach. The airflow spray angle of the nozzle 41 sweeps across the surface of the outer layer as the angle of the folding plate 2 changes. This ensures that the adhesive points set at multiple locations between the outer layer and the inner layer can be stressed during the sweeping process, maintaining the bonding strength of all adhesive points between the outer layer and the inner layer and preventing the problem of adhesive failure during the folding screen test.

[0054] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A welding fixture for welding products, said products comprising an inner layer and an outer layer fitted together, said products having a folded area in the middle, characterized in that, The welding fixture includes: Base; A folding plate is disposed on one side of the base and connected thereto; the folding plate includes a first placement part and a second placement part, the portions of the product located on both sides of its folding area are respectively placed in the first placement part and the second placement part, and the inner layer is placed against the folding plate; A folding hinge is provided corresponding to the folding area. The folding hinge includes a first hinge and a second hinge that rotate synchronously in opposite directions. The first placement part is connected to the first hinge, and the second placement part is connected to the second hinge. A wind power output component is mounted on the base, and the wind power output component outputs pressure through wind power; The folding pivot rotates to drive the product to fold along the folding area, and the wind output component applies force toward the outer layer during the product folding process to make the inner layer and the outer layer fit together; The linkage component connects the folding plate and the wind output component respectively. The folding plate rotates and drives the wind output component to change the force application angle, thereby changing the pressure position of the airflow on the outer layer of the product. A linkage wire, one end of which is connected to the folding plate; A rotating plate is rotatably connected to the base via a rotating shaft. The rotating plate and the wind power output component are fixed. The other end of the linkage wire is connected to the rotating plate. The linkage wire pulls the rotating plate to rotate around the axis of the rotating shaft. The wind power output component includes multiple nozzles arranged in a linear array. The wind power output component also includes several elastic air tubes connected to each nozzle. The nozzles and the rotating plate are fixed. Several air inlets are provided on the base. Each elastic air tube is connected to an air inlet. The nozzle is connected to a cooling device, which is used to reduce the temperature of the airflow ejected from the nozzle.

2. The welding fixture according to claim 1, characterized in that: A torsion spring is provided on the rotating shaft, and the torque of the torsion spring drives the rotating plate to return to a horizontal state.

3. The welding fixture according to claim 1, characterized in that: The base is provided with a linkage groove to accommodate the linkage wire, and the surface roughness of the inner wall of the linkage groove is in the range of 20μm-50μm.

4. A welding fixture according to claim 1, characterized in that: A curvature detection sensor facing the product is provided at the end of the nozzle.

5. A welding fixture according to claim 1, characterized in that: The folding plate is provided with a limiting groove, and the groove wall of the limiting groove is provided with a slot that abuts against the product. The pressure output by the wind power output component squeezes the outer layer of the product, and the inner wall of the slot applies pressure to the inner layer of the product.

6. A welding fixture according to claim 5, characterized in that: A buffer layer is provided inside the card slot.

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