Workpiece conveying workbench facilitating film pasting of backlight assembly

Abstract

The invention discloses a workpiece conveying workbench convenient for film pasting of a backlight assembly. The workpiece conveying workbench comprises a rack, the device comprises a rack, a supporting rod arranged above the rack, a first driving assembly installed on the supporting rod, a second driving assembly arranged below the first driving assembly, a transverse rod arranged below the second driving assembly, a positioning recognition assembly arranged below the transverse rod and a group of expansion assemblies installed on the two sides below the transverse rod. Large-area uniform adsorption of downward pressing deformation is achieved through the bulk adsorption pipe, the flexible deformation adsorption part and the memory metal wire, inertial impact generated when the mechanical arm moves is dispersed, the stress concentration area of the edge of a screen is reduced to be smaller than or equal to 0.3 MPa from being larger than 1.5 MPa, and the microcrack occurrence rate is reduced by 98%. The gathered adsorption pipe provides concentrated grabbing force through local strong adsorption, the transverse shearing force generated when the mechanical arm suddenly stops or turns is counteracted, and it is ensured that the center area of the screen is zero in offset.

Description

Technical Field

[0001] The present invention is a workpiece transfer workbench facilitating film pasting for a backlight assembly, belonging to the technical field of workbenches. Background Art

[0002] In the field of modern electronic display technologies, as the core optical structure of LCD (Liquid Crystal Display) and OLED (Organic Light-Emitting Diode) screens, the performance of the backlight assembly directly determines the brightness uniformity, color rendition, and visual comfort of display devices. Taking the LCD screen as an example, the backlight assembly is usually composed of multiple layers of optical materials such as a light guide plate, a diffusion film, a brightness enhancement film, and a reflector stacked together. Among them, the light guide plate is responsible for uniformly converting the side-emitting LED light source into a surface light source, and the diffusion film scatters light through micron-scale optical particles to eliminate local bright and dark spots. Although the OLED screen does not require a traditional light guide plate, its flexible encapsulation layer and polarizing film still need to achieve anti-reflection, anti-oxidation, and mechanical support functions through a precise film pasting process. Therefore, the film pasting process for the backlight assembly needs to meet the stringent requirements of sub-micron alignment accuracy (within ±5μm) and zero bubble residue to ensure the stability of optical performance and the product yield.

[0003] The current film pasting process still faces multiple technical challenges. Traditional manual operation relies on the experience of operators for positioning and attachment. Not only is the production efficiency low (about 30 seconds per piece), but due to factors such as hand tremors and visual fatigue, the positioning deviation often reaches more than ±50μm, making it difficult to meet the requirements of high-resolution display devices. Even when using automated transfer equipment, its mechanical structure and control logic still have significant defects: First, during the transfer process of the backlight assembly, it needs to be grasped and transported by a robotic arm or a linear module. The inertial force (F = ma) generated by the robotic arm during the acceleration and deceleration stages will act on the surface of the workpiece. Taking a typical robotic arm as an example, the acceleration of its Z-axis can reach 2g (g is the acceleration due to gravity). If the adsorption force is not dynamically compensated, the screen substrate (such as a 0.7mm thick glass) is likely to undergo micron-scale slippage due to inertia at the moment of starting and stopping movement, resulting in subsequent film pasting position deviation. Second, the adsorption devices of existing transfer equipment mostly adopt a single vacuum adsorption mode. Uneven distribution of the adsorption force is likely to form stress concentration (>1.5MPa) in the edge area of the screen, causing microcracks in the glass or deformation of the light guide plate.

[0004] Before film pasting, the existing workpiece needs to transfer the backlight assembly to the processing area through a transfer workbench. During the transfer process, the robotic arm will exert a certain force on the workpiece to ensure smooth movement. However, during the movement and placement process, due to the action of inertial force, it is easy to cause slight deviation and slight damage to its backlight panel, affecting the quality of subsequent finished products. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a workpiece transfer workbench for facilitating film pasting of a backlight assembly, so as to solve the problems of the existing technology.

[0006] To achieve the above object, the present invention is realized by the following technical solutions: A workpiece transfer workbench for facilitating film pasting of a backlight assembly, comprising: A frame, a support rod arranged above the frame, a first driving assembly installed on the support rod, a second driving assembly arranged below the first driving assembly, a cross bar arranged below the second driving assembly, a positioning and identifying assembly arranged below the cross bar, and a set of expansion assemblies installed on both sides below the cross bar; The second driving assembly is driven by the first driving assembly to move horizontally left and right. In cooperation with the positioning and identifying assembly to position the position of the screen to be processed, one of the expansion assemblies is moved above the screen to be processed. The cross bar is driven by the second driving assembly to rise / fall, and the expansion assembly is adsorbed and moved with the screen to be processed; An open port is arranged below the expansion assembly, several groups of scattered adsorption tubes arranged on the outer ring inside the expansion assembly, and several groups of concentrated adsorption tubes arranged on the inner ring inside the expansion assembly; The concentrated adsorption tubes and the scattered adsorption tubes are communicated with an external air pump, and a negative pressure control valve group is arranged between the concentrated adsorption tubes and the scattered adsorption tubes and the external air pump, and the adsorption forces of the concentrated adsorption tubes and the scattered adsorption tubes are respectively controlled by the negative pressure control valve group; A telescopic first pressure monitoring assembly arranged among multiple said concentrated adsorption tubes, the surface pressure of the expansion assembly on the screen assembly is monitored by the first pressure monitoring assembly, and the length of the first pressure monitoring assembly is greater than that of the concentrated adsorption tubes and less than that of the scattered adsorption tubes; A control module, the control module is electrically connected to the pressure assembly, the negative pressure control valve group, the external air pump, and the positioning and identifying assembly. The downward distance of the expansion assembly is monitored and controlled through the cooperation of the first pressure monitoring assembly and the control module; Through the cooperation of the control module and the negative pressure control valve group, the negative pressure value of the scattered adsorption tubes for performing paradigmatic multi-point adsorption on the screen to be processed is controlled, and the negative pressure value of the concentrated adsorption tubes for performing concentrated multi-point adsorption on the screen to be processed is controlled.

[0007] As a further improvement, the expansion assembly includes a main sleeve embedded and fixed inside the cross bar, several groups of auxiliary pieces integrally arranged at the lower edge of the main sleeve, and the multiple auxiliary pieces are surrounded to form a one-way open port in the middle of the lower part of the main sleeve; The scattered adsorption tubes penetrate through the main sleeve and are embedded and installed in the auxiliary pieces, and the concentrated adsorption tubes penetrate through the main sleeve.

[0008] As a further improvement, the lower part of the loose - state adsorption tube bends towards the middle of the open end to form a deformed adsorption part, and the pipe orifice of the deformed adsorption part is flush with the inner side wall of the open end. The length of the aggregated - state adsorption tube is 1 / 2 of that of the loose - state adsorption tube, and the diameter of the lower pipe orifice of the aggregated - state adsorption tube is 1 / 3 smaller than that of its upper pipe orifice.

[0009] As a further improvement, in the area of the deformed adsorption part, the pipe of the loose - state adsorption tube is a flexible pipe, and a shape - memory metal wire with a diameter of 0.01 - 0.03 mm is embedded therein.

[0010] As a further improvement, a first conveyor belt is located on one side of the workbench, and a second conveyor belt is located on the other side of the workbench. The screen to be processed is transported by the first conveyor belt, and the processed screen is transported by the second conveyor belt. A workbench is arranged on the frame, and a third driving component that drives the workbench to rotate 180°. Through the cooperation of the first driving component and the positioning and recognition component, the expansion component is moved above the screen to be processed. The screen to be processed is adsorbed and fixed through the cooperation of the second driving component and the expansion component, and in cooperation with the first driving component, the screen to be processed is transported to the corresponding workbench, and simultaneously the film body on the workbench is completed.

[0011] As a further improvement, two working - station areas are arranged on the workbench, and the two working - station areas are switched through the third driving component. Before switching, the first working - station area near the first conveyor belt is the placement area for the screen to be processed, and after switching, it is the placement area for the screen with the film pasted. The second working - station area near the second conveyor belt is the area for pasting the film on the screen to be processed both before and after switching. Among the two expansion components, the first expansion component that always cooperates with the first working - station area and the second expansion component that always cooperates with the second working - station area.

[0012] As a further improvement, it further includes a third conveyor belt located on the side of the second conveyor belt, and the third conveyor belt is used for transporting the film. A film - taking component is arranged on the frame, and through the film - taking component, the film body on the third conveyor belt is transported to the screen to be processed on the workbench for film pasting.

[0013] As a further improvement, the film taking assembly includes a support fixedly installed on the frame, a fourth driving assembly arranged on the side of the support and capable of lifting, a fifth driving assembly arranged on the fourth driving assembly, and a third expanding assembly installed below the fifth driving assembly. The fifth driving assembly controls the expanding assembly to move from above the third conveyor belt to above the second working area. The control module is connected to the fourth driving assembly and the fifth driving assembly.

[0014] As a further improvement, in the first expanding assembly, the negative pressure value range of the loose state adsorption tube is -20 kPa to -30 kPa, and the negative pressure value range of the aggregated state adsorption tube is -40 kPa to -50 kPa. In the second expanding assembly, the negative pressure value range of the loose state adsorption tube is -25 kPa to -35 kPa, and the negative pressure value range of the aggregated state adsorption tube is -50 kPa to -60 kPa. In the third expanding assembly, the negative pressure value range of the loose state adsorption tube is -10 kPa to -20 kPa, and the negative pressure value range of the aggregated state adsorption tube is -30 kPa to -40 kPa.

[0015] As a further improvement, a heating module, a temperature sensing module, and a second pressure monitoring assembly are arranged on the workbench. The heating module, the temperature sensing module, and the pressure module are electrically connected to the control module. The second pressure monitoring assembly monitors the placement state of the screen to be processed, and cooperates with the control module to heat the screen to be processed through the heating module, and heat the screen to be processed with gradient temperature through the temperature sensing module.

[0016] The beneficial effects of the present invention are: The present invention uses the first pressure monitoring assembly to monitor the surface pressure in real time when the expanding assembly contacts the screen. The control module dynamically adjusts the descending speed and adsorption force of the second driving assembly according to the pressure data, and sets a dynamic pressure compensation mechanism. When the detected pressure is close to the threshold value, the control module controls to automatically reduce the descending speed and increase the negative pressure value of the aggregated state adsorption tube to ensure stable adsorption and no damage to the screen. The inertial offset is reduced from ±0.5 mm of the traditional equipment to within ±0.05 mm.

[0017] The loose state adsorption tube realizes large-area uniform adsorption of downward pressure deformation through the flexible deformation adsorption part and the shape memory wire, dispersing the inertial impact during the movement of the robotic arm. The stress concentration area at the edge of the screen is reduced from >1.5 MPa to ≤0.3 MPa, and the incidence of microcracks is reduced by 98%.

[0018] The aggregated state adsorption tube provides a concentrated grasping force through local strong adsorption, offsetting the lateral shear force when the robotic arm makes an emergency stop or turns, ensuring zero offset in the central area of the screen.

[0019] In addition, a 180° flip is achieved through the third drive component. The first work station area and the second work station area alternate between screen placement and film laminating operations. The robotic arm only needs to move a short distance, significantly reducing the inertial impact caused by long-stroke movement. The screen offset rate is reduced from 5% to below 0.2%.

[0020] Through the intelligent coordination of the control module, a closed-loop control system of real-time monitoring - dynamic compensation - structural strengthening is constructed. The negative impact of inertial forces on the backlight module is eliminated from three aspects: mechanical distribution, material adaptation, and motion control. Finally, zero offset and damage-free adsorption during the screen transfer process are achieved, providing a high-precision substrate positioning basis for the subsequent film laminating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 FIG. 1 is a schematic structural diagram of the working state 1 of a workpiece transfer workbench for facilitating film lamination of a backlight module according to the present invention.

[0023] Figure 2 FIG. Figure 1 is an enlarged schematic diagram of the structure at A in FIG.

[0024] Figure 3 FIG. 2 is a schematic side view structural diagram of the working state 1 of a workpiece transfer workbench for facilitating film lamination of a backlight module according to the present invention.

[0025] Figure 4 FIG. Figure 3 is a schematic sectional structural diagram taken along the line A-A in FIG.

[0026] Figure 5 FIG. Figure 4 is an enlarged schematic diagram of the structure at C in FIG.

[0027] Figure 6 FIG. 3 is a schematic side view structural diagram of the working state 2 of a workpiece transfer workbench for facilitating film lamination of a backlight module according to the present invention.

[0028] Figure 7 FIG. Figure 6 is a schematic sectional structural diagram taken along the line B-B in FIG.

[0029] Figure 8 FIG. Figure 7 is an enlarged schematic diagram of the structure at B in FIG.

[0030] Figure 9It is a schematic diagram of the control of a workpiece transfer workbench module for facilitating film pasting on a backlight module according to the present invention.

[0031] 1. Frame; 2. Support rod; 21. First slide rail; 3. First drive assembly; 4. Second drive assembly; 5. Screen to be processed; 51. Processed screen; 6. Air pump; 61. Negative pressure control valve group; 11. Cross bar; 12. Positioning and identification assembly; 13. Expansion assembly; 14. Open port; 15. Diffused adsorption tube; 16. Aggregated adsorption tube; 17. First pressure monitoring assembly; 171. Sleeve; 172. Spring; 131. Main sleeve; 132. Auxiliary piece; 151. Deformable adsorption part; 152. Flexible tube; 153. Shape memory wire; 7. Workbench; 71. Third drive assembly; 72. First working area; 73. Second working area; 74. Heating module; 75. Temperature sensing module; 76. Second pressure monitoring assembly; 133. First expansion assembly; 134. Second expansion assembly; 135. Third expansion assembly; 8. First conveyor belt; 81. Second conveyor belt; 82. Third conveyor belt; 9. Film; 91. Support; 92. Fourth drive assembly; 93. Fifth drive assembly; 94. Second slide rail; 10. Control module. Detailed implementation manners

[0032] To make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention. Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0033] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0034] Refer to Figure 1-9 As shown, a workpiece transfer workbench for facilitating film pasting on a backlight module includes: A frame 1, a support rod 2 arranged above the frame 1, a first driving assembly 3 installed on the support rod 2, a second driving assembly 4 arranged below the first driving assembly 3, a cross bar 11 arranged below the second driving assembly 4, a positioning and identifying assembly 12 arranged below the cross bar 11, and a set of expanding assemblies 13 installed on both sides below the cross bar 11; The first driving assembly 3 drives the second driving assembly 4 to move horizontally left and right, cooperates with the positioning and identifying assembly 12 to position the position of the screen 5 to be processed, moves one of the expanding assemblies 13 above the screen 5 to be processed, drives the cross bar 11 to rise / fall through the second driving assembly 4, and adsorbs and moves the expanding assembly 13 and the screen 5 to be processed; An opening 14 is arranged below the expanding assembly 13, several groups of loose adsorption tubes 15 are arranged on the outer ring inside the expanding assembly, and several groups of concentrated adsorption tubes 16 are arranged on the inner ring inside the expanding assembly; The concentrated adsorption tubes 16 and the loose adsorption tubes 15 are communicated with an external air pump 6, a negative pressure control valve group 61 is arranged between the concentrated adsorption tubes 16 and the loose adsorption tubes 15 and the external air pump 6, and the adsorption forces of the concentrated adsorption tubes 16 and the loose adsorption tubes 15 are respectively controlled through the negative pressure control valve group 61; Each group of negative pressure control valve groups 61 is provided with two, which respectively control the concentrated adsorption tubes 16 and the loose adsorption tubes 15 in the same group.

[0035] A telescopic first pressure monitoring assembly 17 is arranged among a plurality of the concentrated adsorption tubes 16. The surface pressure of the expanding assembly 13 on the screen assembly is monitored through the first pressure monitoring assembly 17. The length of the first pressure monitoring assembly 17 is greater than that of the concentrated adsorption tubes 16 and less than that of the loose adsorption tubes 15; A control module, the control module is electrically connected to the pressure assembly, the negative pressure control valve group 61, the external air pump 6, and the positioning and identifying assembly 12. Through the cooperation of the first pressure monitoring assembly 17 and the control module, the downward movement distance of the expanding assembly is monitored and controlled; Through the cooperation of the control module and the negative pressure control valve group 61, the negative pressure value of the loose adsorption tubes 15 for performing normal multi-point adsorption on the screen 5 to be processed is controlled, and the negative pressure value of the concentrated adsorption tubes 16 for performing concentrated multi-point adsorption on the screen 5 to be processed is controlled.

[0036] Since traditional manual film pasting relies on visual alignment, the positioning error often reaches more than ±50μm, and the inertial force during the movement of the robotic arm easily causes a micron-level offset of the screen, directly affecting the film pasting accuracy.

[0037] The high-precision positioning and recognition component 12 scans the edge features and optical marks of the screen in real time, and the positioning accuracy can reach ±2μm. At the same time, the control module combines the feedback data of the first pressure monitoring component 17 to dynamically adjust the descending speed and adsorption force of the expansion component 13: when the pressure monitoring component detects that the contact pressure on the screen surface is close to the safety threshold, it automatically reduces the descending speed and increases the negative pressure value of the aggregated adsorption tube 16 to ensure adsorption stability while avoiding stress damage.

[0038] The dynamic compensation mechanism reduces the inertial offset from ±0.5mm of traditional devices to within ±0.05mm, meeting the sub-millimeter film pasting requirements of OLED screens. Among them, the positioning and recognition component 12 is a CCD vision system.

[0039] Due to the uneven distribution of adsorption force in traditional vacuum adsorption devices, stress concentration (>1.5MPa) is likely to occur at the screen edge, resulting in microcracks in the glass substrate or deformation of the light guide plate.

[0040] The scattered adsorption tubes 15 are distributed on the outer ring, and the flexible deformation adsorption part 151 and the shape memory alloy wire 153 are used to enhance the adsorption uniformity. For example, the negative pressure value of the scattered adsorption tube 15 of the first expansion component 133 is set to -25kPa. Under the combined action of 12 adsorption points, the single-point stress ≤0.1MPa, greatly dispersing the pressure.

[0041] The aggregated adsorption tubes 16 are concentrated in the inner ring, with a local strong adsorption design (such as the aggregated adsorption tube 16 of the second expansion component 134 - 60kPa). A concentrated grasping force is provided through 6 - 8 adsorption points to ensure that the screen remains absolutely stationary under the pressure of the film pasting roller (about 10N / cm²).

[0042] The deformation adsorption part 151 of the scattered adsorption tube 15 can elastically match the screen curvature (such as R50mm) to avoid microcracks caused by rigid contact. Actual tests show that the stress concentration area at the screen edge is reduced from >1.5MPa in the traditional solution to ≤0.3MPa, and the incidence rate of microcracks in the LCD light guide plate is reduced from 5% to below 0.1%.

[0043] Due to the uncontrollable adsorption force or rough pasting process of traditional devices, the film 9 is stretched, wrinkled, or the bubble rate after fitting is as high as 3% - 5%.

[0044] Through low-negative-pressure flexible adsorption, the scattered adsorption tube 15 is set to -15kPa, and the aggregated adsorption tube 16 is set to -35kPa. Combined with the flexible tube 152 and the deformation adsorption part 151, the flatness deviation of the PET film 9 after adsorption is <5μm.

[0045] In addition, the traditional manual film pasting takes about 30 seconds per piece and requires frequent downtime for adjustment. The overall equipment efficiency (OEE) is only 65%. Through the collaborative design of a double-station, the workbench 7 realizes a 180° flip through the third drive component 71. The first station area 72 and the second station area 73 alternately perform screen placement and film pasting operations. The robotic arm does not need to wait for the single-station cycle, and the production line beat is shortened to 8 seconds per piece.

[0046] The control module uniformly coordinates the action timings of the first, second, and third expansion components 135.

[0047] For example, the first expansion component 133 picks up the screen 5 to be processed on the first conveyor belt 8, the second expansion component 134 picks up the screen that has been processed at the first station, and the third expansion component 135 synchronously completes the film pasting operation at the second station; When the first expansion component 133 transfers the screen to the first station, the third expansion component 135 retracts to the third conveyor belt 82 to grab the film sheet 9, and the second expansion component 134 simultaneously places the processed screen on the second conveyor belt 81.

[0048] Finally, the time per piece is compressed from 30 seconds to 8 seconds, the production capacity is increased by 3.75 times, and the equipment OEE is increased from 65% to over 90%.

[0049] The core advantages compared with the existing technology are as follows. First, through visual positioning and dynamic pressure compensation, the film pasting alignment accuracy is improved to ±2μm, which is 25 times higher than the manual solution, and the offset is reduced by 96%. The adsorption stability is enhanced. The dual-mode adsorption design of the scattered state / aggregated state enables the adsorption force redundancy to be >50%, and the anti-vibration ability is increased by 3 times, with a zero dropout rate during the screen transfer process.

[0050] The hierarchical negative pressure control of -10 kPa to -60 kPa is compatible with heterogeneous materials such as glass substrates and PET film sheets 9, and the breakage rate of the film sheet 9 is reduced by 98%.

[0051] The first pressure monitoring component 17 real-time monitors the surface pressure range of 0 to 5 N when the expansion component 13 contacts the screen, with a resolution of 0.1 N. The control module dynamically adjusts the descent speed and adsorption force of the second drive component 4 according to the pressure data, and sets a dynamic pressure compensation mechanism. When it detects that the pressure is close to the threshold value such as 2.5 N, the control module controls to automatically reduce the descent speed and increase the negative pressure value of the aggregated state adsorption tube 16, such as from -40 kPa to -50 kPa, to ensure stable adsorption and no damage to the screen. The inertial offset is reduced from ±0.5 mm of the traditional equipment to within ±0.05 mm.

[0052] Both the first monitoring component and the second monitoring component are pressure sensors. The first monitoring component includes a sleeve 171 slidably mounted on the main sleeve 131. A pressure sensor is installed at the lower end of the sleeve 171 and is electrically connected to the control module. A spring 172 is installed above the sleeve 171. When the pressure sensor abuts against the screen, it transmits pressure data to the control module.

[0053] The loose adsorption tube 15 achieves a large-area uniform adsorption negative pressure value of -25 kPa for downward deformation through the flexible deformation adsorption part 151 and the shape memory wire 153, dispersing the inertial impact during the movement of the dispensing robotic arm. The stress concentration area at the edge of the screen is reduced from >1.5 MPa to ≤0.3 MPa, and the microcrack incidence rate is reduced by 98%.

[0054] The aggregated adsorption tube 16 provides a concentrated grasping force through local strong adsorption such as -60 kPa, offsetting the lateral shear force of about 10 N / cm² when the robotic arm makes an emergency stop or turns, ensuring zero offset in the central area of the screen.

[0055] In addition, through the third drive component 71, a 180° flip is achieved, and the first station area 72 and the second station area 73 alternately perform screen placement and film pasting operations. The robotic arm only needs to move a short distance <200 mm, significantly reducing the inertial impact angular acceleration generated by long-stroke movement from >5 rad / s² to <1 rad / s², and the screen offset rate from 5% to below 0.2%.

[0056] Through the intelligent coordination of the control module, a closed-loop control system of real-time monitoring - dynamic compensation - structural strengthening is constructed, eliminating the negative impact of inertial forces on the backlight module from three aspects: mechanical distribution, material adaptation, and motion control, and finally achieving zero offset and damage-free adsorption during the screen transfer process, providing a high-precision substrate positioning basis for the subsequent film pasting process.

[0057] As a further improvement, the expansion component 13 includes a main sleeve 131 embedded and fixed inside the cross bar 11, and a number of groups of auxiliary pieces 132 integrally arranged at the lower edge of the main sleeve 131. The multiple auxiliary pieces 132 surround to form a one-way open opening 14 in the middle of the lower part of the main sleeve 131. The loose adsorption tube 15 penetrates through the main sleeve 131 and is embedded in the auxiliary pieces 132, and the aggregated adsorption tube 16 penetrates through the main sleeve 131.

[0058] With the main sleeve 131 as the core load-bearing structure, it is embedded and fixed inside the cross bar 11, and a number of groups of auxiliary pieces 132 are integrated at its lower edge to form a modular assembly structure.

[0059] The fitting and fixing of the main sleeve 131 and the cross bar 11, such as by threaded or snap connection, can withstand the overall dynamic load of the expansion assembly 13, such as adsorption force and the inertia of the robotic arm movement, and avoid adsorption failure caused by vibration.

[0060] The auxiliary piece 132 serves as the carrier of the adsorption tube. Through integrated design, it can accurately position the distribution of the discrete adsorption tubes 15, ensuring that the adsorption area covers the weak areas at the edge of the screen, such as the four corners of the LCD light guide plate.

[0061] The detachable design of the auxiliary piece 132 facilitates the replacement of worn parts separately, such as when the adsorption tubes age or become blocked, reducing the equipment downtime for maintenance by more than 30%.

[0062] Multiple auxiliary pieces 132 enclose to form a one-way opening 14, such as a rectangle or an ellipse, whose size matches the screen 5 to be processed. When adsorbing, the opening 14 faces down to contact the workpiece.

[0063] Through the one-way design of the opening 14, the air flow direction can be concentrated to form a directional adsorption field on the screen surface, such as flowing from the center to the edge, accelerating the air discharge to reduce the adsorption delay.

[0064] By replacing different combinations of auxiliary pieces 132 with different sizes, such as expanding the number or length of the auxiliary pieces 132, the opening 14 can be adapted to different specifications of screens, such as 6 - 15 inches, and the versatility of the equipment is increased by 50%.

[0065] Among them, the opening 14 enables the air flow to quickly reverse when the adsorption terminates, such as by switching the positive pressure through a solenoid valve. The screen desorption response time is shortened to 0.2 seconds, avoiding the risk of displacement caused by residual negative pressure.

[0066] The discrete adsorption tubes 15 penetrate through the main sleeve 131 and are embedded in the auxiliary piece 132, while the aggregated adsorption tubes 16 only penetrate through the main sleeve 131, forming an inner and outer ring adsorption partition. After the discrete adsorption tubes 15 are embedded in the auxiliary piece 132 and are close to the screen edge, a large - area adsorption is achieved through a low negative pressure, such as - 25 kPa, covering the easily deformed areas of the screen, such as the R - corners at the four corners, reducing the local stress concentration to below 0.1 MPa.

[0067] The aggregated adsorption tubes 16 penetrate through the main sleeve 131 and are vertically arranged, providing a local strong adsorption force through a high negative pressure, such as - 60 kPa, to ensure that the central area of the screen remains absolutely stationary under the pressure of the film - sticking roller of about 10 N / cm².

[0068] The control module first cuts off the negative pressure of the aggregated adsorption tubes 16, and then releases the discrete adsorption tubes 15, causing the edge of the screen to disengage from the adsorption area first, avoiding stretching or warping of the film 9 caused by the lag of central desorption.

[0069] The adsorption tube passing through the main sleeve 131 saves lateral space, facilitating the collaborative layout of multiple components in compact devices such as mobile phone screen production lines, such as the handling path planning of the diaphragm 9 of the third expansion component 135.

[0070] By precisely regulating the adsorption force, the scattered / aggregated states of the inner and outer ring adsorption zones meet the mechanical requirements of different process stages. The screen offset is reduced from ±0.5 mm to ±0.05 mm. The flexible adsorption part is adapted to multiple materials such as glass substrates, flexible OLEDs, and PET diaphragms 9, and the loss rate is reduced by 70%. The dynamic adsorption path and desorption timing control support a high-speed production line beat of ≤8 seconds, and the overall equipment efficiency OEE reaches over 90%. It provides a basis for high-precision film pasting technology with both stability and adaptability, solving the problems of adsorption damage, positioning deviation, and production capacity bottlenecks caused by the single structure of traditional equipment.

[0071] The lower part of the scattered adsorption tube 15 bends towards the middle of the open port 14 to form a deformed adsorption part 151, and the pipe orifice of the deformed adsorption part 151 is flush with the inner side wall of the open port 14. The length of the aggregated adsorption tube 16 is 1 / 2 of that of the scattered adsorption tube 15, and the diameter of the lower pipe orifice of the aggregated adsorption tube is 1 / 3 smaller than that of its upper pipe orifice. The pipe of the scattered adsorption tube 15 in the area of the deformed adsorption part 151 is a flexible pipe 152, and a shape memory wire 153 is embedded therein. The diameter of the shape memory wire 153 is 0.01 - 0.03 mm.

[0072] To ensure the restoration of the auxiliary piece 132, through the integration of the shape memory wire 153 and the deformed adsorption part 151 of the flexible pipe 152, the diameter of the shape memory wire 153 embedded in the deformed adsorption part 151 of the scattered adsorption tube 15 is 0.01 - 0.03 mm, and flexible bending is achieved through thermal drive or electric control.

[0073] The shape memory wire 153 is deformed under control to make the adsorption port fit the surface curvature of the screen, such as a screen with an R50 mm arc surface. The adsorption contact area is increased by 40%, and the adsorption stability is enhanced. The material of the flexible pipe 152, such as silica gel or TPU, cooperates with the micron-level deformation of the shape memory wire 153, which can buffer the sudden stop or vibration impact of the robotic arm, and the incidence of microcracks on the screen is reduced by 90%. The shape memory wire 153 maintains elasticity in the range of -20°C to 80°C.

[0074] The deformed adsorption part 151 makes the adsorption air flow direction towards the edge area of the screen, such as the four corners of the LCD light guide plate or the flexible border of the OLED, compensating for the negative pressure attenuation problem of the traditional straight adsorption tube in the edge area. For example, the adsorption force at the four corners of the screen can be increased by 30%, avoiding local offset caused by insufficient adsorption.

[0075] The design with the pipe orifice flush with the inner wall eliminates the height difference. During adsorption, there is no stepped transition at the contact surface between the screen edge and the adsorption part. The single-point pressure concentration is reduced by 50%, from >1 MPa in the traditional solution to ≤0.5 MPa, significantly reducing the risk of microcracks in the glass substrate.

[0076] The composite structure of the flexible tube 152 and the shape memory wire 153 can withstand more than 100,000 cyclic deformations, while the traditional rigid adsorption head can only withstand about 20,000 times, extending the equipment life. The flexible contact surface buffers the sudden stop or vibration shock of the robotic arm. When the Z-axis acceleration >2g, the incidence rate of screen microcracks is reduced from 5% in the traditional solution to below 0.1%.

[0077] In addition, the length of the aggregated adsorption tube 16 is 1 / 2 of that of the dispersed adsorption tube 15. The short tube design makes the aggregated adsorption force concentrated in the center of the screen, such as the OLED light-emitting area or the core area of the LCD backlight module. By providing a high negative pressure, such as -60 kPa, a concentrated grasping force is provided to ensure zero offset in the central area.

[0078] The short tube reduces the air flow transmission resistance, and the negative pressure establishment time is shortened from 0.4 seconds in the traditional solution to 0.2 seconds, meeting the requirement of the high-speed production line beat ≤8 seconds.

[0079] The diameter of the lower orifice of the aggregated adsorption tube 16 is less than 1 / 3 of its upper diameter, forming a tapered structure. The advantage lies in the air flow acceleration effect. Through the tapered orifice, the air flow speed is increased according to the Bernoulli principle, and the negative pressure value in the central area is increased by 15%, such as from -60 kPa to -69 kPa, enhancing the adsorption stability.

[0080] The tapered design makes the adsorption force exponentially decay from the orifice to the screen surface, avoiding local stress concentration caused by sudden changes in adsorption force, such as microcracks in the center of the screen.

[0081] The design with a large-diameter upper part reduces the risk of dust particle blockage. The blockage rate of the traditional equal-diameter orifice >5%, and the maintenance cycle is extended by 3 times.

[0082] During the release of adsorption, the tapered orifice causes the air flow to accelerate in the reverse direction, and the desorption response time in the central area of the screen is shortened to 0.1 seconds, avoiding stretching or warping of the diaphragm 9 caused by central lag.

[0083] A first conveyor belt located on one side of the workbench 7 and a second conveyor belt located on the other side of the workbench 7 are used to transport the screen 5 to be processed through the first conveyor belt and the processed screen 51 through the second conveyor belt. The workbench 7 provided on the frame 1 and the third drive assembly 71 that drives the workbench 7 to rotate 180°. Through the cooperation of the first drive assembly 3 and the positioning and recognition assembly 12, the expansion assembly is moved above the screen 5 to be processed. The second driving component 4 and the expansion component cooperate to adsorb and fix the screen 5 to be processed, and cooperate with the first driving component 3 to transport the screen 5 to the corresponding workbench 7, and synchronously complete the film body on the workbench 7.

[0084] In this embodiment, the first driving component 3, the second driving component 4, the fourth driving component 92, and the fifth driving component 93 are all electric guide rods.

[0085] A first slide rail 21 is installed on the support rod 2, and the second driving component 4 is slidably installed left and right on the first slide rail 21. The first driving component 3 controls the second driving component 4 to move left and right on the first slide rail 21; The lower output end of the second driving component 4 is fixedly installed in the middle above the cross bar 11, and the cross bar 11 is controlled to move up and down by the second driving component 4.

[0086] A second slide rail 94 is fixedly installed on the side of the support 91, and the fifth driving component 93 is slidably installed up and down on the second slide rail 94. The fourth driving component 92 controls the fifth driving component 93 to slide up and down.

[0087] Among them, the third driving component 71 is a forward and reverse motor, and the top of its output shaft is connected to the workbench 7 to control the workbench 7 to perform 180° forward and reverse rotation.

[0088] Two working areas are provided on the workbench 7, and the third driving component 71 is used to switch between the two working areas; The first working area 72 close to the first conveyor belt 8 is the placement area for the screen 5 to be processed before switching and the placement area for the screen with the film attached after switching. The second working area 73 close to the second conveyor belt 81 is the film pasting area for the screen 5 to be processed before and after switching.

[0089] Among the two expansion components 13, the first expansion component 133 that always cooperates with the first working area 72 and the second expansion component 134 that always cooperates with the second working area 73.

[0090] It further includes a third conveyor belt 82 located on the side of the second conveyor belt 81, and the third conveyor belt 82 is used to transport the film sheet 9; A film taking component is arranged on the frame 1, and the film body on the third conveyor belt is transported to the screen 5 to be processed on the workbench 7 through the film taking component for film pasting.

[0091] As a further improvement, the film taking assembly includes a support 91 fixedly installed on the frame 1, a fourth driving assembly 92 that can be lifted and lowered on the side of the support 91, a fifth driving assembly 93 arranged on the fourth driving assembly 92, and a third expanding assembly 135 installed below the fifth driving assembly 93. The fifth driving assembly 93 controls the expanding assembly 13 to move from above the third conveyor belt 82 to above the second working area 73. The control module is connected to the fourth driving assembly 92 and the fifth driving assembly 93.

[0092] The first conveyor belt is dedicated to inputting the screens 5 to be processed, such as uncoated light guide plates or OLED substrates, and the second conveyor belt is dedicated to outputting the finished products after film coating, avoiding cross-interference of materials. The symmetrical layout on both sides saves the horizontal space of the equipment and facilitates the integration of front and back processes, such as cleaning and detection, in a compact production line, such as a mobile phone screen production line.

[0093] The parallel operation of the double conveyor belts increases the material flow speed by 50%, and the single-piece time-consuming is reduced from 12 seconds in the traditional single conveyor belt solution to 8 seconds.

[0094] The positioning and recognition component 12, such as RFID or a vision system, automatically distinguishes the screens to be processed and the finished products, avoiding the rework rate caused by manual misjudgment. The misoperation rate of the traditional solution is >3%. The finished product screens are quickly removed from the film coating area through an independent conveyor belt, reducing the risk of secondary dust pollution.

[0095] Due to the requirement of double-station cooperation, the workbench 7 is divided into two working areas, the first working area 72 and the second working area 73, and is driven by a third driving assembly 71, such as a servo motor + harmonic reducer, to flip by 180°, alternately performing screen adsorption transfer and film coating operations.

[0096] The rotating design enables the first and second expanding assemblies 134 of the expanding assembly 13 to be respectively fixed above the two working areas, reducing the number of cross-region movements of the robotic arm. In the traditional solution, the robotic arm needs to frequently move back and forth to pick up and place materials.

[0097] The synchronous operation of the double stations shortens the production line beat from 15 seconds per piece in the traditional single station to 8 seconds per piece, and the production capacity is increased by 87.5%.

[0098] The first expanding assembly 133 always cooperates with the first working area 72 to adsorb the screen 5 to be processed, and the second expanding assembly 134 always cooperates with the second working area 73 to complete the film coating, avoiding the inertial deviation caused by the long-distance movement of the robotic arm. The deviation amount is reduced from ±0.3 mm to ±0.05 mm. The movement path of the robotic arm is shortened by 40%, the joint wear rate is reduced by 60%, and the maintenance cycle is extended from 3 months to 1 year.

[0099] After the first conveyor belt feeds the screen 5 to be processed into the first working area 72, the workbench 7 rotates 180° to transfer the screen to the second working area 73 for film pasting. At the same time, the first working area 72 is vacated to receive the next batch of screens 5 to be processed.

[0100] The control module adjusts the adsorption force of the expansion component 13 in real time through the pressure monitoring component. For example, during the rotation process, the negative pressure value of the aggregated adsorption tube 16 is increased by 10% to offset the slight movement of the screen caused by the centrifugal force angular acceleration > 2 rad / s².

[0101] Among them, the linkage between the double conveyor belt and the rotating workbench 7 increases the overall equipment efficiency OEE from 70% of the traditional solution to more than 90%. And the rotating workbench 7 driven by the servo motor is 30% more energy-efficient than the traditional pneumatic flipping mechanism, and the positioning accuracy reaches ±0.1°, while the traditional pneumatic solution is ±1°.

[0102] The negative pressure value range of the dispersed adsorption tube 15 in the first expansion component 133 is -20 kPa to -30 kPa, and the negative pressure value range of the aggregated adsorption tube 16 is -40 kPa to -50 kPa. The negative pressure value range of the dispersed adsorption tube 15 in the second expansion component 134 is -25 kPa to -35 kPa, and the negative pressure value range of the aggregated adsorption tube 16 is -50 kPa to -60 kPa. The negative pressure value range of the dispersed adsorption tube 15 in the third expansion component 135 is -10 kPa to -20 kPa, and the negative pressure value range of the aggregated adsorption tube 16 is -30 kPa to -40 kPa.

[0103] Since the first expansion component 133 is responsible for adsorbing and transferring the screen 5 to be processed from the first conveyor belt to the workbench 7 station, it needs to balance adsorption stability and screen protection.

[0104] Therefore, the dispersed adsorption tube 15 uses a medium negative pressure of -20 kPa to -30 kPa to achieve large-area uniform adsorption, dispersing the pressure to avoid microcracks or deformation on the screen surface due to local stress concentration. The aggregated adsorption tube 16 provides local strong adsorption force through a higher negative pressure of -40 kPa to -50 kPa to offset the inertial impact during the movement of the robotic arm and prevent the screen from shifting.

[0105] The screen is made of a rigid material such as a glass substrate and requires sufficient adsorption force to maintain stability. However, too high a negative pressure may cause edge stress concentration, especially in the precision laminated structure of LCD / OLED.

[0106] The second expansion component 134 transfers the screen with the preliminarily attached film 9 into the next step of the film pasting and bubble removal operation, fixes the screen at the film pasting station, and assists the film 9 in fitting. Extremely high stability is required to ensure the optical alignment accuracy.

[0107] Therefore, the loose-state adsorption tube 15 enhances the overall stability by having a negative pressure slightly higher than that of the first component, -25 kPa to -35 kPa, and suppresses micro-vibrations during the film application process by increasing the adsorption coverage area. The negative pressure of the aggregated-state adsorption tube 16 is increased to -50 kPa to -60 kPa to ensure that the screen remains absolutely stationary under the film application pressure and to avoid bubbles or misalignment of the film 9 caused by micron-level offsets.

[0108] The third expansion component 135 transports the film 9 and needs to avoid stretching, wrinkling, or tearing of the film 9 by adsorbing light films such as diffusion films and brightness enhancement films and precisely attaching them to the screen surface.

[0109] Therefore, the loose-state adsorption tube 15 achieves flexible adsorption by using a low negative pressure of -10 kPa to -20 kPa, adapts to the high flexibility of the film 9, and prevents stretching deformation caused by excessive adsorption force. The negative pressure of the aggregated-state adsorption tube 16 is controlled at -30 kPa to -40 kPa to provide a locally controllable adsorption force to assist in aligning the edges of the film 9, while avoiding excessive concave deformation in the central area of the film 9 that may cause wrinkles.

[0110] The material of the film 9 is mostly high-molecular materials such as PET, with a low elastic modulus of about 2 - 4 GPa. Excessive adsorption force is likely to cause irreversible deformation. Through low-negative-pressure flexible adsorption, it can be ensured that the film 9 quickly rebounds when detaching from the expansion component 13 and maintains flatness.

[0111] The synergistic effect of the loose-state and aggregated-state adsorption tubes 16, such as the combination of -35 kPa and -60 kPa in the second component, can form an "outer soft and inner hard" adsorption field, which not only ensures the overall stability of the screen but also resists external disturbances through local strong adsorption.

[0112] The low negative pressure range of -10 kPa to -40 kPa designed for the film 9 characteristics in the third component, combined with the deformation adsorption part 151 of the flexible tube 152, can reduce the stress concentration on the contact surface of the film 9.

[0113] The negative pressure difference between the first and second components, such as -50 kPa vs. -60 kPa for the aggregated-state adsorption tube 16, matches the 180° flipping process of the workbench 7 to ensure that the adsorption force redundancy during the workstation switching process is > 20%, avoiding detachment due to gravity or centrifugal force.

[0114] In the screen adsorption test, under -50 kPa aggregated-state adsorption, the adsorption rigidity of the glass substrate with a thickness of 0.7 mm is increased by 35%, and the residual vibration amplitude < 2 μm meets the film application accuracy requirements.

[0115] In the film 9 adsorption test, during -15 kPa loose-state adsorption, the flatness deviation of the PET film 9 with a thickness of 100 μm is < 5 μm, which is 60% lower than the traditional vacuum adsorption scheme.

[0116] The energy consumption comparison is carried out by controlling the negative pressure value in zones, such as the low negative pressure of the third component. The overall energy consumption of the system is reduced by 18%, and the service life of the air pump 6 is extended by 25%.

[0117] A heating module 74, a temperature sensing module 75, and a second pressure monitoring component 76 are arranged on the workbench 7. The heating module 74, the temperature sensing module 75, and the pressure module are electrically connected to the control module. The placement state of the screen 5 to be processed is monitored by the second pressure monitoring component 76, and the screen 5 to be processed is heated by the heating module 74 in cooperation with the control module, and the screen 5 to be processed is heated by the temperature sensing module 75 with a gradient temperature.

[0118] According to the thermal physical property differences of the screen materials, such as the glass substrate, the OLED light-emitting layer, and the film 9 (PET diffusion film, brightness enhancement film), it is controlled by a two-stage gradient temperature curve: during normal use, it is maintained at 30° in the preheating stage, and when the second pressure monitoring component 76 monitors the pressure when the screen is placed above, it is increased to the heat preservation stage and maintained at 50°C ± 2°C. The laminating adhesive layer reaches the best adhesion peel strength > 1.5 N / mm at 50°C, and at the same time, it avoids excessive softening of the adhesive layer and the shear modulus G drops to 0.1 MPa, ensuring the stable shape after lamination.

[0119] It should be noted that the device structure and drawings of the present invention mainly describe the principle of the present invention. On the basis of this design principle technology, the settings of the power mechanism, power supply system, and control system of the device are not fully described clearly. However, on the premise that those skilled in the art understand the principle of the above invention, the specific power mechanism, power supply system, and control system can be clearly known. The control method of the application document is automatically controlled by a controller, and the control circuit of the controller can be realized by simple programming by those skilled in the art; The standard parts used therein can all be purchased from the market, and can also be customized according to the description of the specification and drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art, and the components known to those skilled in the art, their structures and principles can all be known by those skilled in the art through technical manuals or through conventional experimental methods.

[0120] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A workpiece transfer workbench facilitating film pasting for a backlight module, characterized in that Including: A frame (1), a support rod (2) arranged above the frame (1), a first driving assembly (3) installed on the support rod (2), a second driving assembly (4) arranged below the first driving assembly (3), a cross bar (11) arranged below the second driving assembly (4), a positioning and identifying assembly (12) arranged below the cross bar (11), and a set of expansion assemblies (13) installed on both sides below the cross bar (11); The first driving assembly (3) drives the second driving assembly (4) to move horizontally left and right, cooperate with the positioning and identifying assembly (12) to position the position of the screen to be processed (5), move one of the expansion assemblies (13) above the screen to be processed (5), drive the cross bar (11) to rise / fall through the second driving assembly (4), and adsorb and move the expansion assembly (13) and the screen to be processed (5); An opening (14) is arranged below the expansion assembly (13), several groups of scattered adsorption tubes (15) are arranged on the outer ring inside the expansion assembly (13), and several groups of concentrated adsorption tubes (16) are arranged on the inner ring inside the expansion assembly; The concentrated adsorption tubes (16) and the scattered adsorption tubes (15) are communicated with an external air pump (6), and a negative pressure control valve group (61) is arranged between the concentrated adsorption tubes (16) and the scattered adsorption tubes (15) and the external air pump (6), and the adsorption forces of the concentrated adsorption tubes (16) and the scattered adsorption tubes (15) are respectively controlled through the negative pressure control valve group (61); A telescopic first pressure monitoring assembly (17) is arranged in the middle of the plurality of concentrated adsorption tubes (16), the surface pressure of the expansion assembly (13) on the screen assembly is monitored through the first pressure monitoring assembly (17), and the length of the first pressure monitoring assembly (17) is greater than that of the concentrated adsorption tubes (16) and less than that of the scattered adsorption tubes (15); A control module, the control module is electrically connected to the first pressure monitoring assembly (17), the negative pressure control valve group (61), the external air pump (6), and the positioning and identifying assembly (12), and the downward distance of the expansion assembly is monitored and controlled through the cooperation of the first pressure monitoring assembly (17) and the control module; Through the cooperation of the control module and the negative pressure control valve group (61), the negative pressure value of the scattered adsorption tubes (15) for performing normal multi-point adsorption on the screen to be processed (5) is controlled, and the negative pressure value of the concentrated adsorption tubes (16) for performing concentrated multi-point adsorption on the screen to be processed (5) is controlled.

2. The workpiece transfer workbench for facilitating film pasting on a backlight module according to claim 1, wherein: The expansion assembly (13) includes a main sleeve (131) embedded and fixed inside the cross bar (11), and several groups of auxiliary pieces (132) integrally arranged at the lower edge of the main sleeve (131), and the plurality of auxiliary pieces (132) surround to form a one-way open opening (14) in the middle below the main sleeve (131); The scattered adsorption tubes (15) penetrate through the main sleeve (131) and are embedded and installed in the auxiliary pieces (132), and the concentrated adsorption tubes (16) penetrate through the main sleeve (131).

3. A workpiece transfer workbench facilitating film pasting of a backlight module according to claim 1, characterized in that: The lower part of the loose - state adsorption tube (15) is bent towards the middle of the open port (14) to form a deformed adsorption part (151), and the pipe orifice of the deformed adsorption part (151) is flush with the inner side wall of the open port (14). The length of the aggregated - state adsorption tube (16) is 1 / 2 of that of the loose - state adsorption tube (15), and the diameter of the lower pipe orifice of the aggregated - state adsorption tube is 1 / 3 smaller than that of the upper pipe orifice.

4. The workpiece transfer workbench for facilitating film pasting of a backlight module according to claim 1, wherein: In the area of the deformed adsorption part (151) of the loose - state adsorption tube (15), the pipeline is a flexible tube (152), and a shape - memory metal wire (153) is embedded inside the loose - state adsorption tube (15). The diameter of the shape - memory metal wire (153) is 0.01 - 0.03 mm.

5. The workpiece transfer workbench for facilitating film pasting on a backlight module according to claim 1, characterized in that: A first conveyor belt (8) located on one side of the workbench (7) and a second conveyor belt (81) located on the other side of the workbench (7). The to - be - processed screen (5) is transported by the first conveyor belt (8), and the processed - completed screen (51) is transported by the second conveyor belt (81). A workbench (7) arranged on the frame (1) and a third drive assembly (71) for driving the workbench (7) to rotate 180°. Through the cooperation of the first drive assembly (3) and the positioning and recognition assembly (12), the expansion assembly (13) is moved above the to - be - processed screen (5). The to - be - processed screen (5) is adsorbed and fixed through the cooperation of the second drive assembly (4) and the expansion assembly (13), and in cooperation with the first drive assembly (3), the to - be - processed screen (5) is transported to the corresponding workbench (7), and simultaneously the film body on the workbench (7) is completed.

6. A workpiece transfer workbench for facilitating film pasting of a backlight assembly according to claim 5, wherein: Two working - station areas are arranged on the workbench (7), and the two working - station areas are switched through the third drive assembly (71). Before switching, the first working - station area (72) close to the first conveyor belt (8) is the placement area for the to - be - processed screen (5), and after switching, it is the placement area for the screen with film pasted. Before and after switching, the second working - station area (73) close to the second conveyor belt (81) is the film - pasting area for the to - be - processed screen (5). Among the two expansion assemblies (13), the first expansion assembly (133) that always cooperates with the first working - station area (72) and the second expansion assembly (134) that always cooperates with the second working - station area (73).

7. The workpiece transfer workbench for facilitating film pasting of a backlight module according to claim 6, wherein: It further includes a third conveyor belt (82) located on the side of the second conveyor belt (81), and the third conveyor belt (82) is used for transporting the film sheet (9). A film - taking assembly arranged on the frame (1), and through the film - taking assembly, the film body on the third conveyor belt (82) is transported onto the to - be - processed screen (5) on the workbench (7) for film pasting.

8. A workpiece transfer workbench for facilitating film pasting of a backlight assembly according to claim 7, wherein: The film taking assembly includes a support (91) fixedly installed on the frame (1), a fourth driving assembly (92) arranged on the side of the support (91) and capable of lifting, a fifth driving assembly (93) arranged on the fourth driving assembly (92), and a third expansion assembly (135) installed below the fifth driving assembly (93). The expansion assembly (13) is controlled by the fifth driving assembly (93) to move from above the third conveyor belt (82) to above the second working area (73). The control module is connected to the fourth driving assembly (92) and the fifth driving assembly (93).

9. The workpiece transfer workbench for facilitating film pasting on a backlight module according to claim 8, wherein: In the first expansion assembly (133), the negative pressure value range of the loose state adsorption tube (15) is -20 kPa to -30 kPa, and the negative pressure value range of the aggregated state adsorption tube (16) is -40 kPa to -50 kPa. In the second expansion assembly (134), the negative pressure value range of the loose state adsorption tube (15) is -25 kPa to -35 kPa, and the negative pressure value range of the aggregated state adsorption tube (16) is -50 kPa to -60 kPa. In the third expansion assembly (135), the negative pressure value range of the loose state adsorption tube (15) is -10 kPa to -20 kPa, and the negative pressure value range of the aggregated state adsorption tube (16) is -30 kPa to -40 kPa.

10. A workpiece transfer workbench facilitating film pasting of a backlight module according to claim 1, characterized in that: A heating module (74), a temperature sensing module (75), and a second pressure monitoring assembly (76) are arranged on the workbench (7). The heating module (74), the temperature sensing module (75), and the pressure module are electrically connected to the control module. The placement state of the screen to be processed (5) is monitored through the second pressure monitoring assembly (76), and the screen to be processed (5) is heated through the heating module (74) in cooperation with the control module, and the screen to be processed (5) is heated with a gradient temperature through the temperature sensing module (75).

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