A critical current detection device for a flexible circuit board

Abstract

This invention relates to the field of flexible circuit board testing technology, specifically to a critical current detection device for flexible circuit boards, comprising a detection mechanism; the detection mechanism includes a support; a cylindrical air guide shaft is fixedly mounted on the support; a cylindrical detection body is rotatably mounted on the support; a cylindrical receiving groove is axially provided in the middle of the detection body; the air guide shaft is sleeved in the receiving groove; multiple pressure rollers are axially provided on the outer wall of the detection body; multiple detection components are evenly distributed circumferentially on the outer periphery of the pressure rollers. This invention, through the coaxial structure of the fixed air guide shaft and the rotating detection body, combined with the integrated design of the pressure rollers and the detection body, enables the detection device to complete continuous detection during the rolling of the pressure rollers without stopping sampling, significantly improving detection efficiency; and as the pressure rollers roll, the critical current at each position of each conductor layer can be accurately measured.

Description

Technical Field

[0001] This invention relates to the field of flexible circuit board testing technology, and more specifically to a critical current detection device for flexible circuit boards. Background Technology

[0002] Flexible circuit boards (PCBs) are widely used in consumer electronics, aerospace, and other fields due to their advantages such as thinness, flexibility, and high wiring density. Their critical current and stability directly affect the operational reliability of terminal devices. To achieve efficient fabrication of flexible PCBs, various composite processes have been proposed in related technical fields. Chinese invention patent application number 2025109137351 discloses a composite process for flexible PCBs and a multi-layer flexible PCB structure. This process involves first bending conductor wires into shape, then using a rolling process to deform the conductor wires into a thin sheet-like conductor layer, and finally obtaining the flexible PCB through a composite process, providing a new technical path for conductor layer formation.

[0003] However, the aforementioned roll forming process has significant drawbacks in practical applications. Due to the irregularity of the initial bending shape of the conductor wire, the contact state between the conductor wire and the roll forming mechanism continuously changes during the roll forming process, resulting in periodic or random fluctuations in the roll pressure. This pressure fluctuation directly affects the deformation process of the conductor wire, causing uneven distribution in the width of the final sheet-like conductor layer. For the conductor layer of a flexible circuit board, the width is a key parameter determining its resistance value. Areas with smaller widths have significantly higher resistance values, making them prone to becoming heat sources during power-on operation. The critical current of these heat sources is much lower than that of other areas of the conductor layer, becoming a weak link in the overall critical current of the flexible circuit board. In severe cases, this can lead to localized burnout and the failure of the entire circuit board.

[0004] While the traditional thermal imaging detection technology commonly used in the industry can capture the approximate location and range of the heat-affected zone, it is not possible to accurately detect which conductor layer and which location the weak point is located in due to the very small spacing between conductor layers in flexible circuit boards and the large heat-affected zone generated by the weak point. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing a critical current detection device for flexible circuit boards.

[0006] The objective of this invention is achieved through the following technical solution: a critical current detection device for a flexible circuit board, comprising a detection mechanism; the detection mechanism includes a support; a cylindrical air guide shaft is fixedly mounted on the support; a cylindrical detection body is rotatably mounted on the support; a cylindrical receiving groove is provided axially in the middle of the detection body; the air guide shaft is sleeved in the receiving groove;

[0007] The inner wall of the receiving groove is evenly distributed with multiple strip-shaped reset grooves along the circumference, and the strip-shaped reset grooves extend along the axial direction of the receiving groove; the inner wall of the receiving groove is divided into multiple arc-shaped abutment parts by the strip-shaped reset grooves; the outer wall of the air guide shaft is provided with an abutment boss extending along the axial direction; the abutment boss is sealed and rotatably connected to the arc-shaped abutment parts; the abutment boss is evenly distributed with multiple air inlets along the axial direction; one end of the air guide shaft is provided with a pressure sensing module; the air guide shaft is provided with multiple air intake channels; the air intake channels are arranged one-to-one with the air inlets; the pressure sensing module is provided with a pressure sensor in each air intake channel.

[0008] The outer wall of the detection body is provided with multiple pressure rollers along the axial direction; multiple detection components are evenly distributed around the outer periphery of the pressure rollers; multiple detection channels are evenly distributed around the inner periphery of the pressure rollers; a plunger is slidably sealed inside the detection channel; the plunger is connected to the detection component in a one-to-one correspondence; multiple air outlets are evenly distributed around the arc-shaped abutment part along the axial direction; the air outlets are connected to the detection channels in a one-to-one correspondence.

[0009] The present invention is further configured such that the number of detection channels of each pressure roller is the same as the number of arc-shaped abutments; and the number of air outlets of each arc-shaped abutment is the same as the number of pressure rollers.

[0010] The present invention is further configured such that the detection component includes a detection groove disposed on the outer wall of the pressure roller, a heat-conducting plate disposed on the detection groove, and a deformation component connected to the heat-conducting plate;

[0011] The plunger is telescopically movable in the detection groove; the heat-conducting plate is located at the end of the detection groove away from the plunger; the deformation component is located between the heat-conducting plate and the plunger.

[0012] The present invention is further configured such that the deformation component includes a low-expansion metal sheet and a high-expansion metal sheet connected to each other; both ends of the low-expansion metal sheet and both ends of the high-expansion metal sheet are respectively connected to a heat-conducting plate; the high-expansion metal sheet is disposed between the low-expansion metal sheet and the plunger; and the middle part of the high-expansion metal sheet is connected to the plunger.

[0013] The present invention is further configured such that the distance between the heat-conducting plate and the center of the pressure roller is less than the radius of the pressure roller.

[0014] The present invention is further configured such that the critical current detection device for the flexible circuit board includes a base and a top seat disposed on the top of the base; the base is slidably provided with a tray for placing the flexible circuit board; the top seat is provided with a slide rail; the slide rail is provided with a slider; the slider is connected to a sliding seat; the sliding seat is provided with a connecting seat; the connecting seat is provided with two detection mechanisms; the supports of the two detection mechanisms are respectively disposed at both ends of the connecting seat.

[0015] The present invention is further configured such that the top seat is provided with a guide groove; the sliding seat is provided with a strip-shaped hinge groove; the connecting seat is provided with a hinge block in the middle; and the hinge block is movably disposed in the strip-shaped hinge groove.

[0016] The bracket is provided with a mounting plate; the middle part of the mounting plate is rotatably connected to the connecting seat; the two ends of the mounting plate are respectively provided with a front guide wheel and a rear guide wheel; the front guide wheel and the rear guide wheel are both movably disposed in the guide groove.

[0017] The invention is further configured such that the sliding seat is equipped with a servo motor; the output end of the servo motor is equipped with a gear; the top seat is equipped with a rack arranged parallel to the slide rail; and the gear meshes with the rack.

[0018] The invention is further configured such that: the top seat has an extrusion track at the top of the guide groove; both ends of the extrusion track have extrusion ramps; the bracket has a lower baffle and an upper baffle; the upper baffle is located at the top of the lower baffle; the bracket is movably inserted through the middle of the mounting plate; the mounting plate is located between the lower baffle and the upper baffle; a first spring is provided between the upper baffle and the mounting plate; a floating pin is provided at the top of the bracket; and a second spring is provided between the floating pin and the top of the bracket.

[0019] The invention is further configured such that a contact ball is rotatably provided on the top of the floating pin; the contact ball is used to abut against the bottom surface of the extrusion slope and the extrusion track.

[0020] The beneficial effects of the present invention are as follows: The present invention, through the coaxial structure of the air guide shaft fixed and the detection body rotating, combined with the integrated design of the pressure roller and the detection body, enables the detection device to complete continuous detection during the rolling of the pressure roller without stopping sampling, which greatly improves the detection efficiency; and as the pressure roller rolls, it can accurately measure the critical current at each position of each conductor layer. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0023] Figure 3 This is a cross-sectional view of the present invention;

[0024] Figure 4 yes Figure 3 A magnified view of part A in the middle;

[0025] Figure 5 This is a schematic diagram of the structure of the two detection mechanisms and the connecting seat of the present invention.

[0026] Figure 6 This is a schematic diagram of the detection mechanism of the present invention;

[0027] Figure 7 This is a cross-sectional view of the air guide shaft and the detection body of the present invention in action;

[0028] Figure 8 This is a cross-sectional view of the air guide shaft and the detection body of the present invention from another perspective;

[0029] Figure 9 yes Figure 8 A magnified view of part B in the middle;

[0030] Figure 10 This is a schematic diagram of the structure of the detection body of the present invention;

[0031] Figure 11 This is a schematic diagram of the air guide shaft of the present invention;

[0032] Figure 12 This is a diagram of the internal structure of a flexible circuit board;

[0033] The components include: 1. Bracket; 11. Lower baffle; 12. Upper baffle; 13. First spring; 14. Floating pin; 15. Second spring; 16. Contact ball; 2. Air guide shaft; 21. Abutting boss; 22. Air inlet; 23. Air inlet channel; 24. Pressure sensing module; 3. Detection body; 31. Receiving groove; 32. Strip-shaped reset groove; 33. Arc-shaped abutting part; 34. Air outlet; 4. Pressure roller; 41. Detection channel; 42. Plunger; 43. Detection groove; 44. 45. Heat-conducting plate; 46. Low-expansion metal sheet; 5. High-expansion metal sheet; 5. Base; 51. Tray; 52. Flexible circuit board; 53. Conductor layer; 6. Top seat; 61. Slide rail; 62. Slider; 63. Sliding seat; 64. Strip hinge groove; 65. Guide groove; 66. Connecting seat; 67. Hinge block; 7. Mounting plate; 71. Front guide wheel; 72. Rear guide wheel; 81. Servo motor; 82. Gear; 83. Rack; 9. Extrusion track; 91. Extrusion slope. Detailed Implementation

[0034] The present invention will be further described in conjunction with the following embodiments.

[0035] Depend on Figures 1 to 12 As can be seen, the critical current detection device for a flexible circuit board described in this embodiment includes a detection mechanism; the detection mechanism includes a support 1; the support 1 is fixedly provided with a cylindrical air guide shaft 2; the support 1 is rotatably provided with a cylindrical detection body 3; the detection body 3 has a cylindrical receiving groove 31 along the axial direction in the middle; the air guide shaft 2 is sleeved in the receiving groove 31.

[0036] The inner wall of the receiving groove 31 is evenly distributed with multiple strip-shaped reset grooves 32 along the circumferential direction, and the strip-shaped reset grooves 32 extend along the axial direction of the receiving groove 31; the inner wall of the receiving groove 31 is divided into multiple arc-shaped abutment portions 33 by the strip-shaped reset grooves 32; the outer wall of the air guide shaft 2 is provided with an abutment boss 21 extending along the axial direction; when the abutment boss 21 contacts the arc-shaped abutment portion 33, a sealed rotational fit is formed; when the arc-shaped abutment portion 33 rotates with the detection body 3 to disengage from the abutment boss 21, an air gap is formed between the arc-shaped abutment portion 33 and the outer wall of the air guide shaft 2; the abutment boss 21 is evenly distributed with multiple air inlets 22 along the axial direction; one end of the air guide shaft 2 is provided with a pressure sensing module 24; the air guide shaft 2 is provided with multiple air intake channels 23; the air intake channels 23 are arranged one-to-one with the air inlets 22; the pressure sensing module 24 is provided with a pressure sensor in each air intake channel 23.

[0037] The outer wall of the detection body 3 is provided with multiple pressure rollers 4 along the axial direction; multiple detection components are evenly distributed around the outer periphery of the pressure rollers 4; multiple detection channels 41 are evenly distributed around the inner periphery of the pressure rollers 4; a plunger 42 is slidably sealed inside the detection channel 41; the plunger 42 is connected to the detection component in a one-to-one correspondence; the arc-shaped abutment 33 is evenly distributed with multiple air outlets 34 along the axial direction; the air outlets 34 are connected to the detection channels 41 in a one-to-one correspondence.

[0038] Specifically, in this embodiment, the critical current detection device for the flexible circuit board 52, when detecting the flexible circuit board 52, places multiple pressure rollers 4 on the flexible circuit board 52, and aligns each pressure roller 4 with each conductor layer 53 of the flexible circuit board 52; then, current is passed through the flexible circuit board 52, which heats up. As the pressure rollers 4 roll on the flexible circuit board 52, the detection component senses the heat corresponding to the flexible circuit board 52, thereby pushing the plunger 42 towards the air outlet 34, thus pushing the gas in the detection channel 41 through the air inlet 22 into the air inlet channel 23, thereby changing the pressure in the air inlet channel 23. The pressure sensor can calculate the temperature change at that point on the flexible circuit board 52 by sensing the pressure in the air inlet channel 23.

[0039] In this embodiment, the air guide shaft 2 is fixed and rotates coaxially with the detection body 3. Combined with the integrated design of the pressure roller 4 and the detection body 3, the detection device can complete continuous detection during the rolling of the pressure roller 4 without stopping sampling, which greatly improves the detection efficiency. Furthermore, as the pressure roller 4 rolls, the critical current at each position of each conductor layer 53 can be accurately measured.

[0040] In this embodiment, the critical current detection device for a flexible circuit board has the same number of detection channels 41 as the number of arc-shaped abutment parts 33, and the same number of air outlets 34 as the number of pressure rollers 4.

[0041] This embodiment describes a critical current detection device for a flexible circuit board. The detection component includes a detection groove 43 disposed on the outer wall of a pressure roller 4, a heat-conducting plate 44 disposed on the detection groove 43, and a deformation component connected to the heat-conducting plate 44. A plunger 42 is telescopically movably disposed in the detection groove 43. The heat-conducting plate 44 is disposed at the end of the detection groove 43 away from the plunger 42. The deformation component is disposed between the heat-conducting plate 44 and the plunger 42. In this embodiment, the deformation component includes a low-expansion metal sheet 45 and a high-expansion metal sheet 46 connected to each other. Both ends of the low-expansion metal sheet 45 and both ends of the high-expansion metal sheet 46 are respectively connected to the heat-conducting plate 44. The high-expansion metal sheet 46 is disposed between the low-expansion metal sheet 45 and the plunger 42. The middle part of the high-expansion metal sheet 46 is connected to the plunger 42.

[0042] Specifically, in this embodiment, the critical current detection device for the flexible circuit board 52, when detecting the flexible circuit board 52, places multiple pressure rollers 4 on the flexible circuit board 52, aligning each pressure roller 4 with each conductor layer 53 of the flexible circuit board 52; then, current is passed through the flexible circuit board 52, which heats up. As the pressure rollers 4 roll on the flexible circuit board 52, the heat-conducting plate 44 absorbs the heat at that point in the conductor layer 53, and simultaneously transfers the heat to the low-expansion metal sheet 45 and the high-expansion metal sheet 46. Because the thermal expansion coefficient of the high-expansion metal sheet 46 is greater than that of the low-expansion metal sheet 45, the middle parts of the low-expansion metal sheet 45 and the middle parts of the high-expansion metal sheet 46 bulge towards the plunger 42, thereby pushing the plunger 42 towards the air outlet 34. This pushes the gas in the detection channel 41 through the air inlet 22 into the air intake channel 23, thereby changing the pressure in the air intake channel 23. The pressure sensor can calculate the temperature change at that point on the flexible circuit board 52 by sensing the pressure in the air intake channel 23.

[0043] In this embodiment, a critical current detection device for a flexible circuit board is described, wherein the distance between the center of the heat-conducting plate 44 and the pressure roller 4 is less than the radius of the pressure roller 4.

[0044] The critical current detection device for a flexible circuit board described in this embodiment further includes a base 5 and a top seat 6 disposed on the top of the base 5; the base 5 is slidably provided with a tray 51 for placing the flexible circuit board 52; the top seat 6 is provided with a slide rail 61; the slide rail 61 is provided with a slider 62; the slider 62 is connected to a sliding seat 63; the sliding seat 63 is provided with a connecting seat 66; the connecting seat 66 is provided with two detection mechanisms; the brackets 1 of the two detection mechanisms are respectively disposed at both ends of the connecting seat 66.

[0045] Specifically, in this embodiment, when the flexible circuit board 52 is being tested, the critical current detection device for the flexible circuit board first places the flexible circuit board 52 in the tray 51, and then pushes the tray 51 so that the flexible circuit board 52 is located at the bottom of the detection mechanism.

[0046] In one of the testing mechanisms, multiple pressure rollers 4 are placed on a flexible circuit board 52, with each pressure roller 4 aligned with each conductor layer 53 of the flexible circuit board 52. Current is then applied to the flexible circuit board 52, causing it to heat up and drive the pressure rollers 4 to roll on the board. When one row of heat-conducting plates 44 presses against multiple conductor layers 53 of the flexible circuit board 52, the abutment 21 abuts against the arc-shaped abutment 33 corresponding to that row of heat-conducting plates 44, and the air outlet 34 corresponding to that row of heat-conducting plates 44 aligns and connects with the air inlet 22 of the abutment 21. At this point, each testing channel 41, each air inlet 22, each air outlet 34 corresponding to that row of heat-conducting plates 44, and each... Each detection channel 41 forms a sealed space. The row of heat-conducting plates 44 absorbs the heat at the current position of each conductor layer 53 and then transfers the heat to the low-expansion metal sheet 45 and the high-expansion metal sheet 46. Since the thermal expansion coefficient of the high-expansion metal sheet 46 is greater than that of the low-expansion metal sheet 45, the middle part of the low-expansion metal sheet 45 and the middle part of the high-expansion metal sheet 46 bulge towards the plunger 42, thereby pushing the plunger 42 towards the air outlet 34, thereby pushing the gas in the detection channel 41 through the air inlet 22 into the air inlet channel 23, thereby changing the pressure in the air inlet channel 23. Each pressure sensor senses the pressure in each air inlet channel 23, and the temperature change at the current position of each conductor layer 53 of the flexible circuit board 52 can be calculated.

[0047] Then, the pressure roller 4 continues to roll on the flexible circuit board 52, causing the arc-shaped abutment 33 corresponding to the row of heat-conducting plates 44 to be misaligned with the abutment boss 21. Since there is a gap between the arc-shaped abutment 33 and the outer wall of the air guide shaft 2, the air outlet 34 corresponding to the row of heat-conducting plates 44 is connected to the atmosphere. After the high-expansion metal sheet 46 and the low-expansion metal sheet 45 are cooled down, they drive the plunger 42 to reset. At the same time, when the abutment boss 21 rotates to the strip reset groove 32, all the air inlets 22 are connected to the atmosphere through the strip reset groove 32, thereby restoring the original air pressure of the air intake channel 23.

[0048] The pressure roller 4 continues to roll on the flexible circuit board 52 until the next row of heat-conducting plates 44 press on the multiple conductor layers 53 of the flexible circuit board 52, thereby performing critical current detection on the next position of the multiple conductor layers 53 of the flexible circuit board 52.

[0049] Since there is a gap between two adjacent heat-conducting plates 44 on the outer wall of the pressure roller 4 during the rotation process, a single detection mechanism cannot perform overcurrent detection at every position of the conductor layer 53. Therefore, this embodiment sets up two or more detection mechanisms, and the detection positions of the multiple detection mechanisms are complementary, so that overcurrent detection can be performed at all positions of the conductor layer 53.

[0050] This embodiment of a critical current detection device for a flexible circuit board includes a top seat 6 with a through guide groove 65; a sliding seat 63 with a strip-shaped hinge groove 64; a connecting seat 66 with a hinge block 67 in the middle; the hinge block 67 is movably disposed in the strip-shaped hinge groove 64; a bracket 1 with a mounting plate 7; the middle of the mounting plate 7 is rotatably connected to the connecting seat 66; a front guide wheel 71 and a rear guide wheel 72 are rotatably disposed at both ends of the mounting plate 7; both the front guide wheel 71 and the rear guide wheel 72 are movably disposed in the guide groove 65. In this embodiment of a critical current detection device for a flexible circuit board, the sliding seat 63 is equipped with a servo motor 81; the output end of the servo motor 81 is equipped with a gear 82; the top seat 6 is equipped with a rack 83 arranged parallel to the slide rail 61; the gear 82 meshes with the rack 83.

[0051] Specifically, since the flexible circuit board 52 is Z-shaped, in this embodiment, through the above-mentioned settings, the servo motor 81 drives the gear 82 to rotate. With the cooperation of the gear 82 and the rack 83, the sliding seat 63 is driven to slide along the slide rail 61. When passing through the turning position, under the action of the front guide wheel 71 and the rear guide wheel 72, the bracket 1 can be driven to rotate accordingly, ensuring that the flexible circuit board 52 can still be effectively detected at the turning point.

[0052] In this embodiment, a critical current detection device for a flexible circuit board is described. The top seat 6 has a pressing track 9 at the top of the guide groove 65; both ends of the pressing track 9 have pressing inclined surfaces 91; the support 1 has a lower baffle 11 and an upper baffle 12; the upper baffle 12 is located on top of the lower baffle 11; the support 1 is movably inserted through the middle of the mounting plate 7; the mounting plate 7 is located between the lower baffle 11 and the upper baffle 12; a first spring 13 is provided between the upper baffle 12 and the mounting plate 7; a floating pin 14 is movably extended at the top of the support 1; a second spring 15 is provided between the floating pin 14 and the top of the support 1. In this embodiment, a contact ball 16 is rotatably provided at the top of the floating pin 14; the contact ball 16 is used to abut against the pressing inclined surface 91 and the bottom surface of the pressing track 9. With the above arrangement, when the contact ball 16 moves to the pressing inclined surface 91, it pushes the support 1 downwards, thereby pressing the pressure roller 4 onto the flexible circuit board 52.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A critical current detection device for a flexible circuit board, characterized by: The system includes a testing mechanism; the testing mechanism includes a support (1); the support (1) is fixedly provided with a cylindrical air guide shaft (2); the support (1) is rotatably provided with a cylindrical testing body (3); the testing body (3) has a cylindrical receiving groove (31) axially provided in the middle part; the air guide shaft (2) is sleeved in the receiving groove (31); The inner wall of the receiving groove (31) is evenly distributed with multiple strip-shaped reset grooves (32) along the circumferential direction, and the strip-shaped reset grooves (32) extend along the axial direction of the receiving groove (31); the inner wall of the receiving groove (31) is divided into multiple arc-shaped abutment parts (33) by the strip-shaped reset grooves (32); the outer wall of the air guide shaft (2) is provided with an abutment boss (21) extending along the axial direction; the abutment boss (21) and the arc-shaped abutment parts (33) are sealed and rotatably connected; the abutment boss (21) is evenly distributed with multiple air inlets (22) along the axial direction; a pressure sensing module (24) is provided at one end of the air guide shaft (2); multiple air intake channels (23) are provided inside the air guide shaft (2); the air intake channels (23) are arranged in a one-to-one correspondence with the air inlets (22); the pressure sensing module (24) is provided with a pressure sensor in each air intake channel (23); The outer wall of the detection body (3) is provided with multiple pressure rollers (4) along the axial direction; multiple detection components are evenly distributed around the outer periphery of the pressure rollers (4); multiple detection channels (41) are evenly distributed around the inner periphery of the pressure rollers (4); a plunger (42) is provided in a sealed sliding position inside the detection channel (41); the plunger (42) is connected to the detection component in a one-to-one correspondence; the arc-shaped abutment (33) is evenly distributed with multiple air outlets (34) along the axial direction; the air outlets (34) are connected to the detection channels (41) in a one-to-one correspondence; The detection assembly includes a detection groove (43) disposed on the outer wall of the pressure roller (4), a heat-conducting plate (44) disposed on the detection groove (43), and a deformation assembly connected to the heat-conducting plate (44); The plunger (42) is telescopically movably disposed in the detection groove (43); the heat-conducting plate (44) is disposed at the end of the detection groove (43) away from the plunger (42); the deformation component is disposed between the heat-conducting plate (44) and the plunger (42); The deformation assembly includes a low-expansion metal sheet (45) and a high-expansion metal sheet (46) connected to each other; both ends of the low-expansion metal sheet (45) and both ends of the high-expansion metal sheet (46) are respectively connected to the heat-conducting plate (44); the high-expansion metal sheet (46) is disposed between the low-expansion metal sheet (45) and the plunger (42); the middle part of the high-expansion metal sheet (46) is connected to the plunger (42).

2. The critical current detection apparatus for a flexible circuit board according to claim 1, characterized by: The number of detection channels (41) of each pressure roller (4) is the same as the number of arc-shaped abutments (33); the number of air outlets (34) of each arc-shaped abutment (33) is the same as the number of pressure rollers (4).

3. The critical current detection apparatus for a flexible circuit board according to claim 1, characterized by: The distance between the center of the heat-conducting plate (44) and the pressure roller (4) is less than the radius of the pressure roller (4).

4. The critical current detection device for a flexible circuit board according to claim 1, characterized in that: The critical current detection device for the flexible circuit board further includes a base (5) and a top seat (6) located on top of the base (5); the base (5) is slidably provided with a tray (51) for placing the flexible circuit board (52); the top seat (6) is provided with a slide rail (61); the slide rail (61) is provided with a slider (62); the slider (62) is connected to a sliding seat (63); the sliding seat (63) is provided with a connecting seat (66); the connecting seat (66) is provided with two detection mechanisms; the supports (1) of the two detection mechanisms are respectively located at both ends of the connecting seat (66).

5. The critical current detection device for a flexible circuit board according to claim 4, characterized in that: The top seat (6) is provided with a guide groove (65); the sliding seat (63) is provided with a strip-shaped hinge groove (64); the connecting seat (66) is provided with a hinge block (67) in the middle; the hinge block (67) is movably disposed in the strip-shaped hinge groove (64); The bracket (1) is provided with a mounting plate (7); the middle part of the mounting plate (7) is rotatably connected to the connecting seat (66); the two ends of the mounting plate (7) are respectively provided with a front guide wheel (71) and a rear guide wheel (72); the front guide wheel (71) and the rear guide wheel (72) are both movably disposed in the guide groove (65).

6. The critical current detection device for a flexible circuit board according to claim 4, characterized in that: The sliding seat (63) is equipped with a servo motor (81); the output end of the servo motor (81) is equipped with a gear (82); the top seat (6) is equipped with a rack (83) arranged parallel to the slide rail (61); the gear (82) meshes with the rack (83).

7. The critical current detection device for a flexible circuit board according to claim 5, characterized in that: The top seat (6) is provided with an extrusion track (9) at the top of the guide groove (65); both ends of the extrusion track (9) are provided with extrusion inclined surfaces (91); the bracket (1) is provided with a lower baffle (11) and an upper baffle (12); the upper baffle (12) is located at the top of the lower baffle (11); the bracket (1) is movably inserted through the middle of the mounting plate (7); the mounting plate (7) is located between the lower baffle (11) and the upper baffle (12); a first spring (13) is provided between the upper baffle (12) and the mounting plate (7); a floating pin (14) is provided at the top of the bracket (1); a second spring (15) is provided between the floating pin (14) and the top of the bracket (1).

8. The critical current detection device for a flexible circuit board according to claim 7, characterized in that: The top of the floating pin (14) is rotatably provided with a contact ball (16); the contact ball (16) is used to abut against the bottom surface of the extrusion slope (91) and the extrusion track (9).

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