A reinforcing steel sheet and back adhesive pressure fit device

Abstract

The present application relates to the technical field of FPC reinforcing steel sheet manufacturing, in particular to a reinforcing steel sheet and back adhesive pressure-fitting and bonding device, which is used for laminating and bonding the back adhesive layer on the surface of the reinforcing steel sheet to form a back adhesive reinforcing steel sheet for FPC mounting process, comprising: a rack, and a lifting driving mechanism arranged on the rack and used for driving the lifting of the pressure-fitting roller assembly. Through the reverse rotation of the horizontal shaft and the pressure-fitting roller, the centrifugal vibration direction of the eccentric mass block is continuously changed relative to the pressure-fitting working surface, the alternating shear force is generated at the interface of the back adhesive and the steel sheet, the bubbles are broken or discharged from the edge in the reciprocating extrusion, and the vibration simultaneously promotes the slight flow of the back adhesive layer to fill the microscopic depressions on the surface of the steel sheet. The device adapts to the back adhesive bonding requirements of the FPC reinforcing steel sheet, improves the interface bonding quality in the auxiliary material preparation link, and provides more reliable process guarantee for the subsequent FPC mounting and printed circuit board assembly.

Description

Technical Field

[0001] This invention relates to the field of FPC reinforcing steel sheet manufacturing technology, and in particular to a pressing and bonding device for reinforcing steel sheets and adhesive backing. Background Technology

[0002] Reinforcing steel sheets are widely used in the manufacturing of flexible printed circuit boards (FPCs). Before use, an adhesive layer needs to be laminated onto their surface to form an adhesive-backed reinforcing steel sheet. This allows FPC manufacturers to remove the release film and attach it to areas requiring localized reinforcement, such as connectors and solder joints. The quality of the press-fitting between the adhesive and the steel sheet directly determines the reliability of the bond between the reinforcing steel sheet and the FPC, thus affecting the yield of integrated circuit packaging and subsequent semiconductor device assembly.

[0003] Currently, the bonding of reinforcing steel sheets to adhesive backing mainly employs flatbed hot pressing or roller pressing, a typical press-fitting process for metal and non-metal parts. Due to the thin adhesive layer and microscopic undulations on the steel sheet surface, air between the adhesive layer and the steel sheet interface is difficult to completely expel during the press-fitting process, easily leaving micro-air bubbles after bonding. The presence of these bubbles reduces the effective bonding area, lowers peel strength, and, during subsequent high-temperature reflow soldering processes, thermal expansion can lead to quality problems such as bulging, delamination, or even detachment, directly affecting the reliability of FPCs in integrated circuit packaging. Furthermore, existing press-fitting equipment generally lacks proactive intervention methods for addressing air bubbles at the bonding interface; process parameters such as pressing pressure and speed rely on manual experience for setting, making it difficult to guarantee consistent bonding quality. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a pressing and bonding device for reinforcing steel sheets and adhesive backing to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides a pressing and bonding apparatus for reinforcing steel sheets and adhesive backing, used to press and bond adhesive backing to the surface of reinforcing steel sheets to form adhesive-backed reinforcing steel sheets for use in FPC mounting processes, comprising:

[0006] A frame, and a lifting drive mechanism mounted on the frame for driving the pressing roller assembly to rise and fall, the pressing roller assembly comprising:

[0007] The pressing roller is a hollow cylinder with its outer surface being the pressing working surface;

[0008] The second drive mechanism is used to drive the pressing roller to rotate about its own axis in a first direction;

[0009] A horizontal shaft is coaxially disposed within the hollow cavity of the pressing roller;

[0010] A first driving mechanism is used to drive the horizontal axis to rotate about its own axis in a second direction opposite to the first direction;

[0011] An eccentric mass block, fixed to the surface of the horizontal axis, generates periodic centrifugal vibration as it rotates. The horizontal axis rotates in the opposite direction to the pressing roller, causing the vibration direction to continuously alternate relative to the pressing working surface, generating alternating shear force at the adhesive-steel sheet interface, which promotes the removal of interface bubbles.

[0012] As a preferred embodiment of the present invention, the wall of the pressure roller is provided with a sandwich layer, and an annular track is provided in the sandwich layer. Multiple steel balls are installed in the annular track. When the pressure roller rotates, the steel balls roll in the annular track and collide with each other, generating random high-frequency impact vibration.

[0013] As a preferred technical solution of the present invention, the pressing and bonding device further includes a pressing platform disposed below the pressing roller. The pressing platform is provided with a heating structure, which includes a connecting frame and a limiting pressure plate. One end of the connecting frame is detachably connected to the machine frame. The limiting pressure plate is disposed on the connecting frame and located above the pressing platform. The interior of the limiting pressure plate is hollow to form a heating chamber, and a heating element is disposed in the heating chamber.

[0014] As a preferred technical solution of the present invention, the pressurization platform is provided with positive pressure air holes and negative pressure air holes. The positive pressure air holes are connected to the positive pressure air chamber, and the negative pressure air holes are connected to the negative pressure air chamber. The positive pressure air chamber and the negative pressure air chamber are respectively switched to be connected to the positive pressure air source interface and the negative pressure air source interface through a three-position three-way solenoid valve.

[0015] As a preferred technical solution of the present invention, a positioning groove is provided on the pressing platform, and a heating plate is detachably provided in the positioning groove. Multiple independent air chambers are formed inside the heating plate. Positive pressure air holes and negative pressure air holes are opened on the upper end face of the heating plate and communicate with the corresponding air chambers. Each air chamber is connected to an air source interface.

[0016] As a preferred technical solution of the present invention, the pressing platform is provided with L-shaped guide plates on both sides for guiding the roll material. The L-shaped guide plates are provided with guide grooves, and the bottom of the L-shaped guide plates is provided with sliders. The pressing platform is provided with slide grooves adapted to the sliders. The sliders can adjust the distance between the two L-shaped guide plates by sliding along the slide grooves. A locking structure is provided between the sliders and the slide grooves.

[0017] As a preferred embodiment of the present invention, the locking structure includes:

[0018] The first positioning hole is formed on the slider;

[0019] And a plurality of second positioning holes are opened along the length direction of the slide groove, and the first positioning hole is aligned with any of the second positioning holes and then locked and fixed by bolts.

[0020] As a preferred embodiment of the present invention, the lifting drive mechanism includes:

[0021] A lifting drive cylinder fixedly mounted on the frame;

[0022] And a movable seat fixedly connected to the piston rod of the lifting drive cylinder;

[0023] A roller bracket is fixedly connected to the movable seat, and the pressing roller is rotatably connected to the roller bracket.

[0024] As a preferred embodiment of the present invention, the first driving mechanism includes:

[0025] The drive motor is mounted on the roller support;

[0026] The first belt is provided between the second belt pulley and the output shaft of the drive motor and the first belt pulley is provided at the end of the horizontal shaft.

[0027] As a preferred embodiment of the present invention, the second driving mechanism includes:

[0028] The gearbox is mounted on the roller bracket;

[0029] The drive shaft mounted on the roller support rotates. The drive motor is a dual-shaft motor. The input end of the gearbox is connected to one of the output shafts of the drive motor, and the output end of the gearbox is connected to the drive shaft via a belt drive mechanism.

[0030] A first gear coaxially connected to the drive shaft;

[0031] The second gear is located at the end of the pressing roller and meshes with the first gear. When the drive motor drives the horizontal shaft to rotate, it can synchronously drive the pressing roller to rotate in the opposite direction.

[0032] The beneficial effects of this invention are as follows: By rotating the horizontal axis and the pressure roller in opposite directions, the centrifugal vibration direction generated by the eccentric mass block continuously alternates relative to the pressure working surface, generating alternating shear force at the interface between the adhesive and the steel sheet. This causes air bubbles to burst or be discharged from the edge during reciprocating extrusion. Compared with unidirectional extrusion, the multidirectional action results in a shorter exhaust path. The vibration also promotes micro-flow of the adhesive layer, filling the micro-depressions on the surface of the steel sheet. The horizontal axis and the pressure roller are driven independently, and their rotation speeds can be adjusted separately to match the rheological characteristics of different adhesives. The vibration source is integrated inside the roller, facilitating modular integration. This device is suitable for the adhesive bonding requirements of FPC reinforcing steel sheets, improves the interface bonding quality in the auxiliary material preparation stage, and provides more reliable process assurance for subsequent FPC mounting and printed circuit board assembly. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0035] Figure 2 This is a schematic diagram of the overall main structure of the present invention;

[0036] Figure 3 This is a partial three-dimensional structural diagram of the present invention;

[0037] Figure 4 This is a schematic diagram of the main view of the roller support, press roller, drive motor, first belt pulley, second belt pulley, third belt pulley, fourth belt pulley, second belt, horizontal shaft, eccentric mass block, annular track and steel ball of the present invention.

[0038] Figure 5 This is a partial three-dimensional structural diagram of the roller support, press roller, drive motor, first belt pulley, second belt pulley, third belt pulley, fourth belt pulley, second belt, horizontal shaft, eccentric mass block, annular track and steel ball of the present invention.

[0039] Figure 6 This is a schematic diagram of the main half-section structure of the pressure roller of the present invention;

[0040] Figure 7 This is a half-sectional three-dimensional structural diagram of the pressure roller of the present invention;

[0041] Figure 8 This is a three-dimensional structural diagram of the connecting frame, limiting pressure plate, first fastener and heating element of the present invention;

[0042] Figure 9 This is a partial cross-sectional three-dimensional structural diagram of the pressing platform and L-shaped guide plate of the present invention;

[0043] Figure 10 This is a three-dimensional structural diagram of the press-fitting platform, L-shaped guide plate, heating plate, and gas source interface of the present invention.

[0044] Figure 11 This is a partial cross-sectional three-dimensional structural diagram of the heating plate of the present invention.

[0045] The markings in the diagram are as follows: 1. Frame; 2. Pressing platform; 3. Cylinder mounting bracket; 4. Lifting drive cylinder; 5. Movable seat; 6. Roller bracket; 7. Pressing roller; 8. L-shaped guide plate; 9. Slider; 10. Slide groove; 11. First positioning hole; 12. Second positioning hole; 13. Sandwich plate; 14. Horizontal shaft; 15. First bearing; 16. Second bearing; 17. First pulley; 18. Drive motor; 19. Second pulley; 20. First belt; 21. Eccentric mass block; 22. Gearbox; 23. Transmission. 24. Drive shaft; 25. Bearing housing; 26. First gear; 27. Second gear; 28. Third pulley; 29. ​​Fourth pulley; 20. Second belt; 31. Circular track; 32. Steel ball; 33. Connecting frame; 34. Limiting pressure plate; 35. Gasket; 36. First fastener; 37. Chamber; 38. Heating element; 39. Heating plate; 40. Positive pressure air port; 41. Negative pressure air port; 42. Air source interface; 43. Positioning groove; 44. Third positioning hole; 45. Fourth positioning hole; 46. Second fastener. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0047] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0048] Reference Figure 1 , Figure 2 This invention provides a pressing and bonding device for reinforcing steel sheets and adhesive backing, relating to the field of FPC (Flexible Printed Circuit) processing technology, specifically to the adhesive backing pressing and bonding process in the preparation of FPC reinforcing steel sheets. It is used to press and bond the adhesive backing layer to the surface of the reinforcing steel sheet to prepare an adhesive-backed reinforcing steel sheet. The prepared adhesive-backed reinforcing steel sheet is a key auxiliary material in FPC processing, and its bonding quality directly affects the mounting reliability of the FPC and the yield of subsequent integrated circuit packaging. It belongs to the upstream supporting equipment of the FPC / printed circuit manufacturing industry chain. This device, as an independent functional module on the adhesive backing laminator, is fixedly installed at the pressing station of the adhesive backing laminator via a frame 1.

[0049] In this embodiment, the frame 1 has an overall L-shaped structure, including a horizontal base plate and a vertical plate. The horizontal base plate is fixedly connected to the worktable of the adhesive bonding machine by fastening bolts, ensuring the stability of the device during use. The side of the vertical plate serves as an installation reference surface for mounting components such as the lifting drive mechanism and the pressing platform 2.

[0050] Continue to refer to Figure 1 In this embodiment, a pressing platform 2 is provided in the middle of the frame 1. The pressing platform 2 is horizontally fixed to the side of the frame 1 and reinforced by the bottom support structure to support the roll material to be pressed (i.e., the already stacked reinforcing steel sheets and adhesive backing layer). The upper surface of the pressing platform 2 is the working surface, which is precision ground and the flatness tolerance is controlled within 0.02mm to ensure uniform pressure distribution during the pressing process.

[0051] Reference Figure 1 and Figure 2 In this embodiment, the upper part of the frame 1 is provided with a lifting drive mechanism and a pressing roller assembly. The pressing roller assembly is located directly above the pressing platform 2 and can move up and down relative to the pressing platform 2.

[0052] Preferably, a vertical guide rail (not shown in the figure) can be added to the vertical plate of the frame 1, and the movable seat 5 slides with the guide rail to ensure the directional accuracy and repeatability of the lifting movement.

[0053] Reference Figure 2 To address the technical challenges of uneven pressure distribution and inconsistent pressing depth between the pressing rollers and the roll material during the pressing process, this embodiment optimizes the arrangement and guiding structure of the lifting drive mechanism. It employs a dual-cylinder synchronous drive combined with vertical guide rails to improve the smoothness and repeatability of the pressing rollers' lifting motion. Specifically, the lifting drive mechanism includes a cylinder mounting frame 3, a lifting drive cylinder 4, a movable seat 5, and a roller support 6. The cylinder mounting frame 3 is fixedly mounted on the vertical plate of the frame 1, and the cylinder body of the lifting drive cylinder 4 is bolted to the cylinder mounting frame 3.

[0054] The piston rod of the lifting drive cylinder 4 extends vertically downwards, and the end of the piston rod is fixedly connected to the movable seat 5. The movable seat 5 is a plate-shaped component, horizontally positioned above the pressing platform 2. Preferably, there are two lifting drive cylinders 4, respectively located on the left and right sides of the crossbeam of the frame 1. The two cylinders operate synchronously, jointly driving the movable seat 5 to move up and down, ensuring that the movable seat 5 lifts and lowers smoothly without tilting.

[0055] The roller bracket 6 is fixedly connected to the lower end face of the movable seat 5 and rises and falls synchronously with the movable seat 5. The roller bracket 6 has an inverted U-shape or frame structure, with its two side walls extending downward and equipped with bearing seats for rotatably mounting the pressure roller 7.

[0056] Reference Figure 3 , Figure 4 , Figure 5 To address the technical problem of existing pressing and bonding devices lacking active intervention methods for bubbles at the bonding interface, this embodiment optimizes the pressing roller assembly. By setting an eccentric mass block on the horizontal shaft and driving the horizontal shaft to rotate in the opposite direction to the pressing and bonding roller, alternating shear force is generated at the interface to promote bubble discharge. The pressing roller assembly is set on the roller support 6 and includes a pressing and bonding roller 7, a horizontal shaft 14, an eccentric mass block 21, a first driving mechanism, and a second driving mechanism.

[0057] In this embodiment, the pressing roller 7 is a hollow cylinder, and its outer surface is the pressing working surface, which is used to directly contact the backing adhesive layer and apply pressing pressure. The two ends of the pressing roller 7 are rotatably mounted in the bearing seats on both sides of the roller bracket 6 through bearings, so that the pressing roller 7 can rotate freely around its own axis.

[0058] In this embodiment, the horizontal shaft 14 is coaxially disposed within the hollow cavity 36 of the pressure roller 7. Both ends of the horizontal shaft 14 extend from both ends of the pressure roller 7 and are rotatably connected to the roller support 6 via the second bearing 16. The horizontal shaft 14 and the pressure roller 7 are relatively rotated together via the first bearing 15, allowing them to rotate independently without interference. The first bearing 15 is positioned within the cavity 36 near both ends of the pressure roller 7 to ensure the coaxiality and rotational stability of the horizontal shaft 14 within the cavity 36.

[0059] Reference Figure 4 , Figure 5 An eccentric mass block 21 is fixedly disposed on the surface of the horizontal shaft 14. In this embodiment, the eccentric mass block 21 is a semi-cylindrical or fan-shaped metal counterweight, which is fixed to the outer circumferential surface of the horizontal shaft 14 by welding, threaded connection, or key connection. The center of mass of the eccentric mass block 21 is offset from the rotation axis of the horizontal shaft 14, so when the horizontal shaft 14 rotates, the eccentric mass block 21 generates periodic centrifugal vibration.

[0060] Preferably, there are multiple eccentric mass blocks 21, spaced apart along the length of the transverse axis 14. The multiple eccentric mass blocks 21 are arranged in the same or staggered phases along the circumference of the transverse axis 14. When arranged in the same phase, the centrifugal forces generated by each eccentric mass block 21 are superimposed in the same direction, resulting in the maximum vibration amplitude. When arranged in staggered phases (e.g., adjacent eccentric mass blocks are 180 degrees apart), time-division variation of the vibration direction can be achieved, obtaining a more complex vibration mode. In this embodiment, three eccentric mass blocks 21 are used, with adjacent blocks differing by 120 degrees in the circumferential direction, ensuring that the centrifugal forces at each cross-section of the transverse axis 14 are balanced during rotation, preventing bending deformation of the transverse axis.

[0061] Reference Figure 4 , Figure 5 The first driving mechanism is used to drive the horizontal shaft 14 to rotate around its own axis in a first direction, and the second driving mechanism is used to drive the pressure roller 7 to rotate around its own axis in a second direction, the first direction being opposite to the second direction.

[0062] To achieve the reverse rotational engagement between the eccentric mass block and the pressure roller, this embodiment optimizes the drive mechanism by employing a dual-axis motor in conjunction with belt drive and a gearbox. This enables independent speed adjustment and reverse linkage between the horizontal shaft and the pressure roller. Specifically, the first and second drive mechanisms share a single drive motor 18, which is a dual-axis motor with two output shafts extending from both ends of the motor's main body. The drive motor 18 is fixedly mounted on the roller support 6.

[0063] The first drive mechanism includes a first output shaft of a drive motor 18, a second pulley 19, a first pulley 17, and a first belt 20. The first pulley 17 is fixedly mounted on the end of the horizontal shaft 14, and the second pulley 19 is fixedly mounted on the first output shaft of the drive motor 18. The first belt 20 is sleeved between the first pulley 17 and the second pulley 19. When the drive motor 18 is running, power is transmitted to the horizontal shaft 14 via the first output shaft, the second pulley 19, the first belt 20, and the first pulley 17, driving the horizontal shaft 14 to rotate in a first direction.

[0064] The second drive mechanism includes a gearbox 22, a drive shaft 23, a third pulley 27, a fourth pulley 28, a second belt 29, a first gear 25, and a second gear 26. The gearbox 22 is mounted on the roller support 6, and its input end is connected to the second output shaft of the drive motor 18. The output end of the gearbox 22 is connected to the third pulley 27. Both ends of the drive shaft 23 are rotatably mounted on the roller support 6 via bearing seats 24. The fourth pulley 28 is fixedly connected to the drive shaft 23, and the second belt 29 is fitted between the fourth pulley 28 and the third pulley 27. The first gear 25 is also coaxially connected to the drive shaft 23, and the second gear 26 is fixedly mounted at the end of the pressing roller 7. The first gear 25 and the second gear 26 mesh with each other.

[0065] When the drive motor 18 is running, the power is transmitted to the pressure roller 7 via the second output shaft, gearbox 22, third pulley 27, second belt 29, fourth pulley 28, drive shaft 23, first gear 25, and second gear 26, driving the pressure roller 7 to rotate in the second direction.

[0066] By setting the transmission ratio of the gearbox 22, the speed ratio between the horizontal shaft 14 and the pressure roller 7 can be adjusted. In this embodiment, the transmission ratio of the gearbox 22 is set to a speed ratio between the horizontal shaft 14 and the pressure roller 7 of 1.5:1 to 3:1, so as to ensure that the vibration frequency generated by the eccentric mass block 21 and the rotation frequency of the pressure roller 7 are effectively matched to obtain the best exhaust effect.

[0067] It should be noted that the first drive mechanism and the second drive mechanism can also use independent drive motors to drive the horizontal shaft 14 and the pressure roller 7 respectively, which can also achieve the technical effect of reverse rotation.

[0068] It should be noted that the magnitude of the excitation force generated by the eccentric mass block 21 is proportional to the square of the rotational speed of the horizontal axis 14, and the vibration frequency is consistent with the rotational speed of the horizontal axis 14. If the frequency is too low, the bubble has enough time to return to its original position with the adhesive layer within a single vibration cycle, and cannot form an effective cumulative displacement; if the frequency is too high, the adhesive layer responds elastically and does not have enough time to deform, and the vibration energy is absorbed by the elasticity of the adhesive layer and cannot be transmitted to the bubble.

[0069] In this embodiment, the rotational speed of the horizontal shaft 14, after being adjusted by the gearbox 22, forms a speed difference with that of the pressure roller 7. This speed difference determines the frequency of the alternating shear force. Theoretical analysis and experimental verification show that when the frequency of the alternating shear force is in the range of 5-50Hz, the effect on bubble removal at the adhesive layer-steel sheet interface is most significant. Within this frequency range, the adhesive layer has sufficient fluidity to respond to vibration without experiencing elastic hysteresis due to excessively high frequencies.

[0070] The vibration amplitude is determined by both the mass and eccentricity of the eccentric mass block 21. If the amplitude is too small, it is insufficient to break the adhesion between the bubble and the interface; if the amplitude is too large, it may cause relative slippage between the steel sheet and the adhesive, leading to a shift in the bonding position. In this embodiment, the eccentric mass block 21 adopts a semi-cylindrical structure, and its mass and eccentricity are calculated and matched to control the vibration amplitude of the working surface of the pressing roller 7 within the range of 0.05-0.3mm. This amplitude effectively breaks the bubble-interface bond without significantly affecting the positioning accuracy of the steel sheet. Simultaneously, the negative pressure adsorption of the pressing platform 2 further suppresses the lateral displacement caused by vibration by fixing the roll material.

[0071] In actual use, operators can select the optimal parameter combination within a frequency range of 5-50Hz and an amplitude range of 0.05-0.3mm by adjusting the speed of the drive motor 18 and the transmission ratio of the gearbox 22, based on the viscosity and thickness of the adhesive and the specifications of the steel sheet, to achieve the best exhaust effect under different working conditions.

[0072] Reference Figure 4 , Figure 5 , Figure 6 , Figure 7 To further broaden the vibration frequency band and enhance the breaking effect on bubbles of different sizes at the interface, this embodiment optimizes the pressure roller 7 by setting an annular track and steel balls 31 in the inner wall interlayer. The random high-frequency impact vibration generated by the rolling collision of the steel balls 31 forms a broadband composite vibration with the regular periodic vibration generated by the eccentric mass block 21. The inner wall of the pressure roller 7 is provided with an interlayer, which is enclosed by an interlayer plate 13 to form an annular cavity that extends along the circumference of the pressure roller 7. An annular track 30 is provided in the interlayer. The cross-section of the annular track 30 is circular or semi-circular to accommodate the steel balls 31 and guide their rolling.

[0073] The annular track 30 contains multiple steel balls 31, the diameter of which is slightly smaller than the cross-sectional diameter of the annular track 30, allowing the steel balls 31 to roll freely within the track. When the pressure roller 7 rotates, the steel balls 31 roll along the annular track 30 under the influence of gravity and centrifugal force. Due to the different positions and speeds of the steel balls 31 within the track, they collide randomly with each other, generating high-frequency impact vibrations. The frequency and amplitude of these random impact vibrations are not fixed, constituting a broadband random vibration source.

[0074] Preferably, there are multiple annular tracks 30, which are spaced apart in the interlayer along the length of the transverse axis 14. Each annular track 30 is parallel to each other and not connected to each other, and each annular track 30 is equipped with multiple steel balls 31. By setting multiple annular tracks 30, random impact vibration can be uniformly generated along the entire length of the pressure roller 7, avoiding vibration concentration in a certain local area.

[0075] Reference Figure 9 , Figure 10 To address the technical problems of unstable positioning of the roll material and its susceptibility to displacement due to vibration during the pressing process, this embodiment optimizes the pressing platform 2. Positive pressure air holes 39 and negative pressure air holes 40 are opened on the working surface of the pressing platform 2. Negative pressure is used to adhere and fix the roll material, while positive pressure backflushing assists in demolding, ensuring accurate positioning of the roll material during the pressing process. The pressing platform 2 is a horizontally positioned plate-like component, fixed in the middle of the frame 1, directly below the pressing roller 7. The pressing platform 2 serves to support the roll material during the pressing process, providing flat and stable support for the pressing operation.

[0076] The upper surface of the pressing platform 2 is the working surface, which is parallel to the pressing working surface of the pressing roller 7. The gap between the two is the pressing channel of the roll material.

[0077] The pressing platform 2 is provided with a positioning groove 42. The positioning groove 42 is a rectangular groove, which is located in the central area of ​​the upper surface of the pressing platform 2. Its outline is adapted to the width of the roll material to be pressed.

[0078] A heating plate 38 is detachably mounted in the positioning groove 42. The heating plate 38 is a flat plate-shaped component whose dimensions are adapted to the positioning groove 42 and can be embedded in it. Third positioning holes 43 are provided at both ends of the heating plate 38, and fourth positioning holes 44 are provided at corresponding positions in the positioning groove 42. A second fastener 45 passes through the third positioning holes 43 and the fourth positioning holes 44 in sequence to fix the heating plate 38 onto the pressing platform 2. When it is necessary to replace or maintain the heating plate 38, simply loosen the second fastener 45 to remove the heating plate 38 from the positioning groove 42, making the operation convenient.

[0079] The heating plate 38 has multiple independent air chambers inside, which are arranged along the length of the heating plate 38 and separated from each other by partitions. The upper end face of the heating plate 38 has positive pressure air holes 39 and negative pressure air holes 40. The positive pressure air holes 39 are connected to the positive pressure air chambers, and the negative pressure air holes 40 are connected to the negative pressure air chambers.

[0080] In this embodiment, the positive pressure vents 39 and negative pressure vents 40 are arranged in an alternating manner: along the length of the heating plate 38, the positive pressure vents 39 and negative pressure vents 40 are arranged alternately; in the width direction, adjacent vents are staggered by half a vent spacing, forming a honeycomb distribution. The positive pressure vents 39 are straight holes of equal diameter, with a diameter of 0.8mm-1.5mm, to ensure concentrated airflow and strong impact force during positive pressure backflushing. The negative pressure vents 40 have an upper port diameter larger than the lower port diameter, and their axial cross-section is an isosceles trapezoid (i.e., trumpet-shaped), with an upper port diameter of 2.5mm-3.5mm and a lower port diameter of 1.5mm-2.0mm. This structure allows for stable airflow diffusion, a large adsorption area, and uniform adsorption force during negative pressure adsorption.

[0081] Each air chamber has an external air source interface 41, which is located on the side of the press-fit platform 2. Each air source interface 41 is switched to either a negative pressure air source interface or a positive pressure air source interface via a three-position three-way solenoid valve. The three-position three-way solenoid valve has three working positions: the first working position connects the air source interface 41 to the negative pressure air source interface (adsorption mode), the second working position connects the air source interface 41 to the positive pressure air source interface (backflush mode), and the third working position closes the air source interface 41 (pressure holding mode). By controlling the switching of the three-position three-way solenoid valve through the controller, each air chamber can be independently switched between adsorption mode, backflush mode, and pressure holding mode, thereby achieving independent adsorption or backflush control of different areas of the roll material.

[0082] Reference Figure 1 , Figure 2 , Figure 8 To further reduce the viscosity of the adhesive layer and facilitate vibration-induced venting, this embodiment optimizes the heating structure. A heating element 37 is installed upstream of the pressing station to preheat the roll material, ensuring the adhesive layer reaches a suitable temperature before entering the pressing area, thereby reducing its flow resistance. Specifically, the pressing platform 2 is equipped with a heating structure, which includes a connecting frame 32 and a limiting pressure plate 33.

[0083] The connecting frame 32 is an L-shaped bent plate or welded component, one end of which is detachably connected to the frame 1, and the other end extends horizontally above the pressing platform 2. The connecting end of the connecting frame 32 to the frame 1 has a mounting hole, and it is fixedly connected to the column or beam of the frame 1 by bolts.

[0084] A limiting pressure plate 33 is disposed on the horizontal extension end of the connecting frame 32, directly above the pressing platform 2. The limiting pressure plate 33 extends along the width direction of the pressing platform 2, and its length is adapted to the width of the pressing platform 2. The interior of the limiting pressure plate 33 is hollow to form a heating chamber 36, which is flat and extends along the length direction of the limiting pressure plate 33. A heating element 37 is disposed inside the heating chamber 36. The heating element 37 is an electric heating tube, an electric heating wire, or a PTC heating element, which is arranged in a serpentine or reciprocating manner within the heating chamber 36 to increase the heating area and improve heating efficiency.

[0085] The heating element 37 is connected to an external power supply and temperature controller via wires. The limiting plate 33 is also equipped with a temperature sensor (not shown in the figure). The temperature sensor is connected to the temperature controller to form a closed-loop temperature control system, which can accurately control the heating temperature of the limiting plate 33 between 40℃ and 120℃.

[0086] The limiting pressure plate 33 is detachably connected to the connecting frame 32 via a first fastener 35. Specifically, the first fastener 35 is a bolt, which passes through the through hole on the limiting pressure plate 33 and is screwed into the threaded hole on the connecting frame 32.

[0087] A gasket 34 is provided at the contact surface between the limiting pressure plate 33 and the connecting frame 32. The gasket 34 is a thin sheet and can be made of metal or non-metal materials, with different thicknesses (such as 0.1mm, 0.2mm, 0.5mm, 1.0mm, etc.). By increasing or decreasing the number and thickness of the gaskets 34, the distance between the limiting pressure plate 33 and the upper surface of the pressing platform 2 can be adjusted to accommodate reinforcing steel sheets and coils of different thicknesses.

[0088] During operation, the roll material passes through the gap between the limiting pressure plate 33 and the pressing platform 2. A small gap (typically 0.2mm-1.0mm) is maintained between the bottom surface of the limiting pressure plate 33 and the upper surface of the roll material. The limiting pressure plate 33 uses heating elements 37 to radiate or contact heat the roll material passing beneath it, so that the adhesive layer is preheated to the set temperature before entering the pressing station, reducing the viscosity of the adhesive layer and creating favorable conditions for subsequent pressing and degassing.

[0089] It should be noted that this device, through the synergistic effect of vibration-assisted pressing and heating preheating, actively intervenes in and removes interface bubbles during the adhesive bonding stage of the reinforcing steel sheet. This ensures the reliability of the FPC mounting process from the upstream auxiliary material preparation stage, thereby reducing the SMT defect rate caused by poor bonding of the reinforcing steel sheet during integrated circuit packaging.

[0090] Reference Figure 9 , Figure 10 The pressing platform 2 has L-shaped guide plates 8 on both sides for guiding the roll material. The L-shaped guide plate 8 is a long strip component with an L-shaped cross-section, including a vertical part and a horizontal part. The vertical part extends upward to limit the width of the roll material; the horizontal part extends inward to support the edge of the roll material.

[0091] The L-shaped guide plate 8 has a guide groove that extends along the length of the L-shaped guide plate 8 and is located on the inner side of the vertical part. The width of the guide groove is adapted to the thickness of the roll material, and the edge of the roll material can be inserted into the guide groove. The upper and lower walls of the guide groove limit the roll material in the vertical direction.

[0092] A slider 9 is provided at the bottom (i.e., the lower end face of the horizontal section) of the L-shaped guide plate 8. The slider 9 is a rectangular block component, which is fixedly connected to the L-shaped guide plate 8 or integrally formed. A groove 10 adapted to the slider 9 is provided on the pressing platform 2. The groove 10 extends along the width direction of the pressing platform 2, and its cross-section is T-shaped or dovetail-shaped. The slider 9 is embedded in the groove 10 and can slide along the groove 10. Through the sliding engagement of the slider 9 and the groove 10, the distance between the two L-shaped guide plates 8 can be adjusted to accommodate roll materials of different widths.

[0093] A locking structure is provided between the slider 9 and the slide groove 10. The locking structure includes a first positioning hole 11 on the slider 9 and a plurality of second positioning holes 12 along the length of the slide groove 10. The second positioning holes 12 are arranged at equal intervals (e.g., 10mm or 20mm) along the slide groove 10. When the slider 9 slides along the slide groove 10 to the desired position, the first positioning hole 11 is aligned with the corresponding second positioning hole 12, and then a bolt is screwed in to lock it in place, thereby locking the L-shaped guide plate 8 in that position.

[0094] Reference Figure 6 , Figure 7 To address the technical problems of rigid rollers causing damage or extrusion to the adhesive layer through direct contact and their inability to adapt to the micro-undulations of the steel sheet surface, this embodiment optimizes the surface of the pressing roller 7 by covering it with an elastic material layer to achieve flexible contact and adaptive bonding. Specifically, the outer surface of the pressing roller 7 is covered with an elastic material layer. The elastic material layer is made of an elastomer material, preferably urethane elastomer in this embodiment, but silicone rubber, nitrile rubber, or other polymer materials with appropriate hardness and elasticity can also be used.

[0095] The thickness of the elastic material layer is 2mm-10mm, and its hardness (Shore A) is 60-90 degrees. The surface of the elastic material layer is precision ground, resulting in good roundness and surface finish. The elastic material layer serves the following purposes: Firstly, during the pressing process, the elastic material layer makes flexible contact with the adhesive backing layer, avoiding direct contact with the rigid roller surface that could damage or extrude the adhesive backing layer. Secondly, under pressure, the elastic material layer undergoes slight elastic deformation, adaptively conforming to the minute undulations of the steel sheet surface, improving the fit and uniformity of the pressing process.

[0096] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A pressing and bonding device for reinforcing steel sheets and adhesive backing, used to press and bond an adhesive backing layer onto the surface of a reinforcing steel sheet to form an adhesive-backed reinforcing steel sheet for use in FPC mounting processes, characterized in that... include: A frame (1), and a lifting drive mechanism disposed on the frame (1) for driving the pressing roller assembly to rise and fall, the pressing roller assembly comprising: The pressing roller (7) is a hollow cylinder with its outer surface being the pressing working surface; The second drive mechanism is used to drive the press roller (7) to rotate around its own axis in the first direction; The horizontal shaft (14) is coaxially disposed in the hollow cavity of the pressure roller (7); A first drive mechanism is used to drive the horizontal axis (14) to rotate about its own axis in a second direction opposite to the first direction; An eccentric mass block (21) is fixed on the surface of the horizontal shaft (14) and generates periodic centrifugal vibration as it rotates. The horizontal shaft (14) rotates in the opposite direction to the pressing roller (7), so that the vibration direction is continuously alternating relative to the pressing working surface, generating alternating shear force at the adhesive-steel sheet interface, which promotes the removal of interface bubbles.

2. The pressing and bonding device for reinforcing steel sheet and adhesive backing according to claim 1, characterized in that, The wall of the pressure roller (7) is provided with a sandwich layer, and the sandwich layer is provided with an annular track (30). The annular track (30) contains a plurality of steel balls (31). When the steel balls (31) rotate with the pressure roller (7), they roll in the annular track (30) and collide with each other, generating random high-frequency impact vibration.

3. The pressing and bonding device for reinforcing steel sheet and adhesive backing according to claim 2, characterized in that, The pressing and bonding device also includes a pressing platform (2) located below the pressing roller (7). The pressing platform (2) is provided with a heating structure, which includes a connecting frame (32) and a limiting pressure plate (33). One end of the connecting frame (32) is detachably connected to the frame (1). The limiting pressure plate (33) is located on the connecting frame (32) and above the pressing platform (2). The interior of the limiting pressure plate (33) is hollow to form a heating chamber, and a heating element (37) is provided in the heating chamber.

4. The pressing and bonding device for reinforcing steel sheet and adhesive backing according to claim 3, characterized in that, The press-fit platform (2) is provided with a positive pressure air hole (39) and a negative pressure air hole (40). The positive pressure air hole (39) is connected to the positive pressure air chamber, and the negative pressure air hole (40) is connected to the negative pressure air chamber. The positive pressure air chamber and the negative pressure air chamber are respectively connected to the positive pressure air source interface and the negative pressure air source interface through a three-position three-way solenoid valve.

5. The pressing and bonding device for reinforcing steel sheet and adhesive backing according to claim 4, characterized in that, The pressing platform (2) is provided with a positioning groove (42), and a heating plate (38) is detachably provided in the positioning groove (42). Multiple independent air chambers are formed inside the heating plate (38). The positive pressure air hole (39) and the negative pressure air hole (40) are opened on the upper end face of the heating plate (38) and communicate with the corresponding air chamber. Each air chamber is connected to an air source interface (41).

6. The pressing and bonding device for reinforcing steel sheet and adhesive backing according to claim 5, characterized in that, The pressing platform (2) is provided with L-shaped guide plates (8) on both sides for guiding the roll material. The L-shaped guide plates (8) are provided with guide grooves. The bottom of the L-shaped guide plates (8) is provided with sliders (9). The pressing platform (2) is provided with slide grooves (10) that are adapted to the sliders (9). The sliders (9) can adjust the distance between the L-shaped guide plates (8) on both sides by sliding along the slide grooves (10). A locking structure is provided between the sliders (9) and the slide grooves (10).

7. The pressing and bonding device for reinforcing steel sheet and adhesive backing according to claim 6, characterized in that, The locking structure includes: The first positioning hole (11) is opened on the slider (9). And a plurality of second positioning holes (12) are opened along the length direction of the slide (10), and the first positioning hole (11) is aligned with any of the second positioning holes (12) and then locked and fixed by bolts.

8. The pressing and bonding device for reinforcing steel sheet and adhesive backing according to claim 7, characterized in that, The lifting drive mechanism includes: A lifting drive cylinder (4) is fixedly installed on the frame (1); And a movable seat (5) fixedly connected to the piston rod of the lifting drive cylinder (4); The roller bracket (6) is fixedly connected to the movable seat (5), and the pressing roller (7) is rotatably connected to the roller bracket (6).

9. The pressing and bonding device for reinforcing steel sheet and adhesive backing according to claim 8, characterized in that, The first driving mechanism includes: The drive motor (18) is mounted on the roller support (6). The second pulley (19) is disposed on the output shaft of the drive motor (18), and the first pulley (17) is disposed at the end of the horizontal shaft (14). A first belt (20) is sleeved between the first pulley (17) and the second pulley (19).

10. The pressing and bonding device for reinforcing steel sheet and adhesive backing according to claim 9, characterized in that, The second drive mechanism includes: The gearbox (22) is mounted on the roller bracket (6); Rotate the drive shaft (23) mounted on the roller bracket (6). The drive motor (18) is a dual-shaft motor. The input end of the gearbox (22) is connected to one of the output shafts of the drive motor (18). The output end of the gearbox (22) is connected to the drive shaft (23) via a belt drive mechanism. The first gear (25) is coaxially connected to the drive shaft (23); The second gear (26) is located at the end of the pressing roller (7). The second gear (26) meshes with the first gear (25). When the drive motor (18) drives the horizontal shaft (14) to rotate, it can synchronously drive the pressing roller (7) to rotate in the opposite direction.

Images