A circuit board heat resistance performance testing device and method

Abstract

The present invention relates to the field of circuit board detection technology, and in particular, provides a circuit board heat resistance performance detection device and method. The circuit board heat resistance performance detection device includes a detection cabin, the rear end of the detection cabin is closed and the front end is open, a third wheel group is provided in the detection cabin, the third wheel group is located on the bottom side of the first wheel group and the second wheel group, the third wheel group includes a first transmission shaft installed at the rear end of the inner cavity of the detection cabin, and also includes a second transmission shaft arranged from the front end of the detection cabin to the first transmission shaft. The circuit board is transmitted backward from the first wheel group to the second wheel group, the detection range is improved, and the detection effect is better than that of the prior art. When the action of the first heating rod and the second heating rod is pushed backward by the circuit board and placed, the first transmission shaft in the third wheel group is linked to rotate to facilitate operation.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board detection, and in particular to a circuit board heat resistance performance detection device and method. Background Art

[0002] Circuit boards are also called integrated circuit boards. In actual use, a large number of components are installed on them. These components will generate a lot of heat when powered on. The heat is transferred to the circuit board through solder and pins. If the heat resistance of the circuit board is poor, it will cause the resin layer of the circuit to peel or fall off, and even cause the pins of the components soldered on the circuit board to fall off. Therefore, the heat resistance of the circuit board directly determines the quality of the circuit board.

[0003] In order to test the heat resistance of integrated circuit boards, a Chinese patent with application number 202120607914.X discloses a heat resistance testing device for integrated circuit circuit boards, including a box body, expansion masks are fixedly provided on both sides of the inner walls of the box body, and multiple heating resistors are fixedly provided inside the expansion masks, and a movable plate is provided at the lower end of the box body. This prior art uses two heating resistors to test the heat resistance of both sides of the circuit board. Although two detection points will be formed on both sides of the circuit board during the detection, these two heating detection points are concentrated in the same area of ​​the circuit board in a bilaterally symmetrical manner. The detection area is relatively limited, the detection quality is poor, and the information is only obtained through the camera during the detection, the detection effect is poor, and the placement of the circuit board and the electric heating resistor are asynchronously heated, which is inconvenient to operate. Summary of the invention

[0004] In order to solve the above problems, the present invention provides the following technical solutions:

[0005] A circuit board heat resistance performance testing device comprises a testing cabin, wherein the rear end of the testing cabin is closed and the front end is open, a first wheel group is provided at the front end of the testing cabin, a second wheel group is provided at the rear end of the testing cabin, a third wheel group is provided in the testing cabin, the third wheel group is located at the bottom side of the first wheel group and the second wheel group, the third wheel group comprises a first transmission shaft installed at the rear end of the inner cavity of the testing cabin, and also comprises a second transmission shaft arranged from the front end of the testing cabin to the first transmission shaft, the circuit board is transmitted backwards from the first wheel group to the second wheel group, and the bottom end of the circuit board is transmitted backwards to the first transmission shaft by the second transmission shaft, the two ends of the first transmission shaft and the second transmission shaft are installed on the left and right walls of the testing cabin through bearings, and a left transmission shaft is provided in the testing cabin. Two detection components on the right, the detection component on the right side includes a hinged seat fixed on the right wall of the detection cabin and a first detection rod connected to the hinged seat, the hinged end of the first detection rod is provided with a first rotating shaft vertically downward, the free end of the first detection rod extends horizontally forward and close to the first wheel group, and the free end of the first detection rod is installed with a first heating rod close to the right side of the circuit board, the detection component on the left side includes a hinged seat fixed on the left wall of the detection cabin and a second detection rod connected to the hinged seat, the hinged end of the second detection rod is provided with a second rotating shaft vertically downward, the free end of the second detection rod extends horizontally backward and close to the second wheel group, and the free end of the second detection rod is installed with a second heating rod close to the left side of the circuit board;

[0006] A driving wheel is fixed on the first transmission shaft, a driven wheel is fixed on the first rotating shaft, the driving wheel is drivingly connected to the driven wheel, and a secondary wheel is fixed on the second rotating shaft, the driven wheel is drivingly connected to the secondary wheel.

[0007] As a further preference, a door is hinged at the front end of the detection cabin.

[0008] As a further preferred embodiment, a sealing plate is fixed to the rear end of the detection cabin, and a jog button is installed on the front of the sealing plate. The jog button is located on the movement path of the circuit board, and the jog button controls the first heating rod and the second heating rod to be powered on.

[0009] As a further preferred embodiment, a push plate close to the sealing plate is provided in the detection chamber, and a spring seat is connected between the back of the push plate and the front of the sealing plate, so that a movable space is formed between the push plate and the sealing plate under the support of the spring seat.

[0010] As a further preferred embodiment, a second camera is fixed on the left wall of the detection cabin, and a first camera is fixed on the right wall of the detection cabin, the first camera faces the first heating rod, and the second camera faces the second heating rod, and a display screen is fixed to the outside of the detection cabin, and the first camera and the second camera are connected to the display screen circuit.

[0011] As a further preferred embodiment, the first wheel groups are in two locations on the left and right, and a first gap located at the front side is formed between the two first wheel groups; the second wheel groups are in two locations on the left and right, and a second gap located at the rear side and in the same straight line as the first gap at the front side is formed between the two second wheel groups.

[0012] As further preferred, both the first wheel set and the second wheel set are composed of a roller unit and a wheel frame, and the rollers are mounted on the wheel frame by elastic connection, so that the left and right roller units at the same end can be adjusted left and right.

[0013] The present invention also provides a method for detecting heat resistance of a circuit board, which is applicable to a circuit board heat resistance performance detection device, and comprises the following steps:

[0014] Step S01, when testing the thermal conductivity of a circuit board, positioning a first type of circuit board to be tested between two of the first wheel groups and two of the second wheel groups;

[0015] Step S02, supplying electric current to the first heating rod and the second heating rod for heating, wherein the first heating rod heats the first circuit board from the right side to the left, and the second heating rod heats the first circuit board from the left side to the right, until two detection points on the first circuit board are thermally penetrated, and the time taken is recorded;

[0016] Step S03, remove the first type of circuit board to be tested, replace it with the second type of circuit board to be tested, repeat steps S01 and S02, perform thermal penetration on two test points on the second type of circuit board, and record the time taken;

[0017] Step S04, comparing the time taken by the two circuit boards for thermal penetration, obtaining the heat resistance performance, and completing the comparative test.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Clamp the circuit between the first wheel group and the second wheel group in a backward push manner. When the circuit board is positioned and guided by the second wheel group, the rear side of the bottom surface of the circuit board will be transmitted to the first transmission shaft. When it continues to be pushed backward, it will drive the first transmission shaft to rotate. The first transmission shaft drives the driving wheel to rotate, and the driving wheel drives the driven wheel to rotate. The driven wheel drives the first rotating shaft to rotate, and the first rotating shaft drives the first detection rod to deflect to the left, so that the first heating rod leans against the right side of the circuit board. As the circuit board continues to be pushed backward, the first transmission shaft also drives the driving wheel to continue to rotate. When the first heating rod continues to lean against the right side of the circuit board, the heating effect is used to burn through the circuit board from the right side. When burning through, the smoke is discharged from the opposite side of the circuit board. The time is recorded.

[0020] 2. While the driven wheel rotates with the first rotating shaft, it rotates with the secondary wheel by utilizing the transmission relationship. The secondary wheel deflects the second detection rod on the left side, and the second detection rod presses the second heating rod against the left side of the circuit board. Consistent with the action principle of the first heating rod, the second heating rod presses against the left side of the circuit board while applying force and heating, and uses the heating effect to burn through the circuit board from the left side. When burning through, the smoke is discharged from the opposite side of the circuit board. The time is recorded, and the heat resistance of the circuit board is known according to the time of burning through. During the test, the first heating rod and the second heating rod are distributed on the left and right sides of the circuit board, and are respectively located at the front and rear ends of the circuit board. Therefore, during the heat resistance test, not only two heat resistance detection points can be formed on the left and right sides of the circuit board, but also these two heat resistance detection points are respectively located in the front and rear areas of the circuit board, and the detection range is improved, which is better than the detection effect of the prior art. When the action of the first heating rod and the second heating rod is pushed backward by the circuit board, the first transmission shaft in the third wheel group is rotated to facilitate operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of an embodiment of the present invention from the right side perspective;

[0022] Figure 2 It is a schematic diagram of an embodiment of the present invention from a front side perspective, with the door opened and a circuit board placed in the test chamber for testing;

[0023] Figure 3 For the implementation mode of the present invention, Figure 2 The front view plane diagram when the circuit board is removed is shown;

[0024] Figure 4 For the implementation mode of the present invention, Figure 3 The schematic diagram of the top view of the section A after being cut open is shown;

[0025] Figure 5 For the implementation mode of the present invention, Figure 4 The schematic diagram under the three-dimensional perspective is introduced;

[0026] Figure 6 For the implementation mode of the present invention, Figure 5 The schematic diagram after removing the right baffle is shown;

[0027] Figure 7 For the implementation mode of the present invention, Figure 6 Lead out and test the working principle diagram of the circuit board.

[0028] In the figure: 1. detection cabin; 2. first wheel group; 3. second wheel group; 4. third wheel group; 5. first transmission shaft; 6. second transmission shaft; 7. detection assembly; 71. hinged seat; 72. first detection rod; 73. first rotating shaft; 74. first heating rod; 75. second detection rod; 76. second rotating shaft; 77. second heating rod; 9. driving wheel; 10. driven wheel; 11. secondary wheel; 12. cabin door; 13. sealing plate; 14. inching button; 15. push plate; 16. spring seat; 17. activity space; 18. second camera; 19. first camera; 20. display screen; 21. first gap; 22. second gap. DETAILED DESCRIPTION

[0029] The above and other embodiments and advantages of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0030] In one embodiment, if Figure 1-Figure 7As shown: This embodiment provides a circuit board heat resistance performance testing device, including a testing cabin 1, the rear end of the testing cabin 1 is closed and the front end is open, a first wheel group 2 is provided at the front end of the testing cabin 1, a second wheel group 3 is provided at the rear end of the testing cabin 1, a third wheel group 4 is provided in the testing cabin 1, the third wheel group 4 is located at the bottom side of the first wheel group 2 and the second wheel group 3, the third wheel group 4 includes a first transmission shaft 5 installed at the rear end of the inner cavity of the testing cabin 1, and also includes a second transmission shaft 6 arranged from the front end of the testing cabin 1 to the first transmission shaft 5, the circuit board is transmitted backwards from the first wheel group 2 to the second wheel group 3, and the bottom end of the circuit board is transmitted backwards from the second transmission shaft 6 to the first transmission shaft 5, both ends of the first transmission shaft 5 and the second transmission shaft 6 are installed on the left and right walls of the testing cabin 1 through bearings, and the testing cabin 1 is provided with left and right detection components 7, the right detection assembly 7 includes an articulated seat 71 fixed on the right wall of the detection cabin 1 and a first detection rod 72 connected to the articulated seat 71, the articulated end of the first detection rod 72 is provided with a first rotating shaft 73 vertically downward, the free end of the first detection rod 72 extends horizontally forward and close to the first wheel group 2, and the free end of the first detection rod 72 is installed with a first heating rod 74 close to the right side of the circuit board, the left detection assembly 7 includes an articulated seat 71 fixed on the left wall of the detection cabin 1 and a second detection rod 75 connected to the articulated seat 71, the articulated end of the second detection rod 75 is provided with a second rotating shaft 76 vertically downward, the free end of the second detection rod 75 extends horizontally backward and close to the second wheel group 3, and the free end of the second detection rod 75 is installed with a second heating rod 77 close to the left side of the circuit board;

[0031] A driving wheel 9 is fixed on the first transmission shaft 5, and a driven wheel 10 is fixed on the first rotating shaft 73. The driving wheel 9 is transmission-connected to the driven wheel 10. Figure 6 As shown, the driving wheel 9 and the driven wheel 10 are connected by either a cross belt transmission relationship or a gear relationship, for example, by a gear relationship distributed in multiple spaces. Although the driving wheel 9 and the driven wheel 10 are in different angular spaces, the transmission connection can be achieved through the existing above-mentioned transmission technology, and it is no longer drawn in the prior art figure. A secondary wheel 11 is fixed on the second rotating shaft 76, and the driven wheel 10 is belt-driven or chain-driven to the secondary wheel 11.

[0032] When testing a circuit board of a certain material, clamp the circuit between the first wheel group 2 and the second wheel group 3 by pushing it backwards. Figure 7After being clamped as shown, it stands upright in the inspection cabin 1. When the circuit board is positioned and guided by the second wheel group 3, the rear side of the bottom surface of the circuit board will be transmitted to the first transmission shaft 5. When it continues to be pushed backward, it will drive the first transmission shaft 5 to rotate, and the first transmission shaft 5 rotates with the driving wheel 9, and the driving wheel 9 drives the driven wheel 10 to rotate, and the driven wheel 10 drives the first rotating shaft 73 to rotate, and the first rotating shaft 73 drives the first detection rod 72 to deflect to the left, so that the first heating rod 74 leans against the right side of the circuit board. As the circuit board continues to be pushed backward, the first transmission shaft 5 also drives the driving wheel 9 to continue to rotate, and through the above-mentioned transmission relationship, the first detection rod 72 drives the first heating rod 74 to continue to lean against the right side of the circuit board. Because the circuit board is very thin (about two or three millimeters), when the first heating rod 74 continues to lean against the right side of the circuit board, the heating effect is used to burn through the circuit board from the right side. When burning through, the opposite side (left side) of the circuit board is used as the basis for exhausting smoke, and the time is recorded. When the driven wheel 10 rotates with the first rotating shaft 73, it also rotates with the secondary wheel 11 by means of the transmission relationship, and the secondary wheel 11 deflects the second detection rod 75 on the left side, and the second detection rod 75 presses the second heating rod 77 against the left side of the circuit board, which is consistent with the action principle of the first heating rod 74. The second heating rod 77 presses against the left side of the circuit board while applying force and heating, and burns through the circuit board from the left side by means of the heating effect. When burning through, the smoke is discharged from the opposite side (right side) of the circuit board, and the time is recorded. The heat resistance of the circuit board is known according to the time of burning through. During the detection, the first heating rod 74 and the second heating rod 77 are distributed on the left and right sides of the circuit board, and are respectively located at the front and rear ends of the circuit board. Therefore, when performing the above detection, not only two heat resistance detection points can be formed on the left and right sides of the circuit board, but also these two heat resistance detection points are respectively located in the front and rear areas of the circuit board, and the detection range is improved, and the detection effect is better than that of the prior art. The first heating rod 74 and the second heating rod 77 are moved by the circuit board being pushed backwards and placed, and the first transmission shaft 5 in the third wheel set 4 is rotated to facilitate operation.

[0033] When testing circuit boards of two materials, the two circuit boards are merged left and right, and then pushed backward so that they are clamped between the first wheel group 2 and the second wheel group 3. Through the above-mentioned linkage action, the first heating rod 74 forms a heat-resistant detection point on the circuit board on the right and burns through it, and the second heating rod 77 forms a heat-resistant detection point on the circuit board on the left and burns through it. The time taken for their heat-resistant detection points to burn through is recorded. If they burn through at the same time, it proves that even if they are made of different materials, their heat resistance is consistent. On the contrary, the material of the circuit board that burns through later is better than that of the other circuit board. In the bidding process, the circuit boards of the two materials can achieve the purpose of identifying quality.

[0034] The front end of the detection cabin 1 is hinged with a door 12, and the rear end of the detection cabin 1 is fixed with a sealing plate 13. A jog button 14 is installed on the front of the sealing plate 13. The jog button 14 is located on the movement path of the circuit board. The jog button 14 controls the first heating rod 74 and the second heating rod 77 to be powered on. A push plate 15 close to the sealing plate 13 is provided in the detection cabin 1. A spring seat 16 is connected between the rear of the push plate 15 and the front of the sealing plate 13. Under the support of the spring seat 16, an activity space 17 is formed between the push plate 15 and the sealing plate 13.

[0035] After the circuit board is placed from front to back along the two first wheel groups 2 and the two second wheel groups 3, its rear end eventually hits the push plate 15, and finally the hatch 12 is closed, and the rear end (inner surface) of the hatch 12 provides a thrust to the front end of the circuit board, so that the rear end of the circuit board provides a thrust to the push plate 15, forcing the push plate 15 to move backward along the activity space 17. At this time, the spring seat 16 is compressed and shortened, and the rear end of the push plate 15 presses on the inching button 14, so that the first heating rod 74 and the second heating rod 77 are powered on for heating. Compared with the prior art, the circuit board is automatically triggered to power on the heat source (the first heating rod 74 and the second heating rod 77) for heating after being placed, thereby improving the purpose of detection efficiency. The first heating rod 74 and the second heating rod 77 involved are resistive heat-conducting rods hinged at the ends of the two detection rods, which are bent toward the left and right sides of the circuit board respectively. The heating principle can be understood as fast heating, electric heating rods, etc. Their circuits are located in the detection rod, extended from the other end of the detection rod and connected to the inching button 14, and then connected to the external power supply after the output of the inching button 14.

[0036] A second camera 18 is fixed on the left wall of the inspection cabin 1, and a first camera 19 is fixed on the right wall of the inspection cabin 1. The first camera 19 faces the first heating rod 74, and the second camera 18 faces the second heating rod 77. A display screen 20 is fixed on the outside of the inspection cabin 1. The first camera 19 and the second camera 18 are connected to the display screen 20 by circuit. Compared with the cameras in the prior art, the cameras in the present invention are distributed according to the left, right, front and back positions of the circuit board where the heating rods (the first heating rod 74 and the second heating rod 77) are located. When the first heating rod 74 heats one side of the circuit board, the first camera 19 feeds back to the display screen 20 in the form of a video. When the second heating rod 77 heats the other side of the circuit board, the second camera 18 feeds back to the display screen 20 in the form of a video. According to the video, the time taken for the heat penetration of the opposite side of the same circuit board and the two areas involved in the opposite side is intuitively obtained. According to the time taken for them to be heat penetrated, the heat resistance of the two areas is obtained. Compared with the method in which the camera in the prior art only detects the same area of ​​the circuit board, the detection effect is improved.

[0037] The first wheel groups 2 are at two locations on the left and right, and a first gap 21 located at the front side is formed between the two first wheel groups 2. The second wheel groups 3 are at two locations on the left and right, and a second gap 22 located at the rear side and in the same straight line as the first gap 21 at the front side is formed between the two second wheel groups 3.

[0038] The first wheel group 2 and the second wheel group 3 are both composed of a roller unit and a wheel frame, and the roller is installed on the wheel frame by elastic connection, so that the left and right roller units at the same end can be adjusted left and right. As shown in the figure, their roller units are installed in a sleeve through the wheel frame, and the other end of the sleeve is installed on the wall of the detection cabin 1. Both the first wheel group 2 and the second wheel group 3 are retractable. For circuit boards of different thicknesses or when two circuit boards are placed at the same time, the first gap 21 in the first wheel group 2 and the second gap 22 in the second wheel group 3 automatically adjust the distance to position and clamp the circuit board in the detection cabin 1, thereby achieving the purpose of flexible use.

[0039] The present invention also provides a method for detecting heat resistance of a circuit board, which is applicable to a circuit board heat resistance performance detection device, and comprises the following steps:

[0040] Step S01, when testing the thermal conductivity of the circuit board, position the first type of circuit board to be tested between the two first wheel groups 2 and the two second wheel groups 3;

[0041] Step S02, current is supplied to the first heating rod 74 and the second heating rod 77 for heating, the first heating rod 74 heats the first circuit board from the right side to the left, and the second heating rod 77 heats the first circuit board from the left side to the right, until two detection points on the first circuit board are thermally penetrated, and the time taken is recorded;

[0042] Step S03, remove the first type of circuit board to be tested, replace it with the second type of circuit board to be tested, repeat steps S01 and S02, perform thermal penetration on two test points on the second type of circuit board, and record the time taken;

[0043] Step S04, compare the time used for heat penetration of the two circuit boards, obtain the heat resistance, and complete the comparison test. If the time used for heat penetration of the two circuit boards is inconsistent, it proves that the circuit with longer heat penetration time has better heat resistance than the other circuit board.

[0044] Two circuit boards can also be placed at the same time, one on the left and one on the right. Through the above detection method, the first heating rod 74 on the right is deflected to the circuit board on the right, and a heating detection point is formed on the circuit board on the right. The time taken to heat-pierce the circuit board through the heat detection point is 3 seconds. The second heating rod 77 on the left is deflected to the circuit board on the left, and a heating detection point is formed on the circuit board on the left. The time taken to heat-pierce the circuit board through the heat detection point is 4 seconds, which proves that the heat resistance of the left circuit board is better than that of the right circuit board. That is, the material of the left circuit board is better than that of the right circuit board.

[0045] The above orientation designations do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the orientations are described relatively with reference to the figures. In essence, the specific orientations of the components are described according to their actual installation and actual use as well as the customary orientations of technicians in this field. This is hereby explained.

[0046] The specific implementation methods described above further describe the invention purpose, technical solutions, and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A circuit board heat resistance testing device, characterized in that: The invention comprises a detection chamber (1), wherein the rear end of the detection chamber (1) is closed and the front end is open, a first wheel group (2) is provided at the front end of the detection chamber (1), a second wheel group (3) is provided at the rear end of the detection chamber (1), a third wheel group (4) is provided in the detection chamber (1), the third wheel group (4) is located at the bottom side of the first wheel group (2) and the second wheel group (3), the third wheel group (4) comprises a first transmission shaft (5) installed at the rear end of the inner cavity of the detection chamber (1), and also comprises a second transmission shaft (5) arranged from the front end of the detection chamber (1) to the first transmission shaft (5). The circuit board is transmitted backwards from the first wheel group (2) to the second wheel group (3), and the bottom end of the circuit board is transmitted backwards from the second transmission shaft (6) to the first transmission shaft (5), and both ends of the first transmission shaft (5) and the second transmission shaft (6) are mounted on the left and right walls of the detection cabin (1) through bearings. The detection cabin (1) is provided with left and right detection components (7), and the detection component (7) on the right side includes a hinge seat (71) fixed on the right wall of the detection cabin (1) and a first detection component (7) connected to the hinge seat (71). The first detection rod (72) is provided with a first rotating shaft (73) extending vertically downward at a hinged end of the first detection rod (72), the free end of the first detection rod (72) extends horizontally forward and close to the first wheel group (2), the free end of the first detection rod (72) is provided with a first heating rod (74) close to the right side of the circuit board, the detection assembly (7) on the left side comprises a hinged seat (71) fixed on the left wall of the detection cabin (1) and a second detection rod (75) connected to the hinged seat (71), the hinged end of the second detection rod (75) is provided with a first rotating shaft (73) extending vertically downward The second rotating shaft (76) is fixed to the first transmission shaft (5), the free end of the second detection rod (75) extends horizontally backward and close to the second wheel group (3), and the free end of the second detection rod (75) is installed with a second heating rod (77) close to the left side of the circuit board; a driving wheel (9) is fixed to the first transmission shaft (5), a driven wheel (10) is fixed to the first rotating shaft (73), the driving wheel (9) is connected to the driven wheel (10) in a transmission manner, and a secondary wheel (11) is fixed to the second rotating shaft (76), and the driven wheel (10) is connected to the secondary wheel (11) in a transmission manner; The rear side of the bottom surface of the circuit board is transmitted to the first transmission shaft (5), and when it continues to be pushed backward, it will drive the first transmission shaft (5) to rotate, and the first transmission shaft (5) drives the driving wheel (9) to rotate, and the driving wheel (9) drives the driven wheel (10) to rotate, and the driven wheel (10) drives the first rotating shaft (73) to rotate, and the first rotating shaft (73) drives the first detection rod (72) to deflect to the left, so that the first heating rod (74) leans against the right side of the circuit board; while the driven wheel (10) drives the first rotating shaft (73) to rotate, it also drives the secondary wheel (11) to rotate by utilizing the transmission relationship, and the secondary wheel (11) drives the second detection rod (75) on the left to deflect, and the second detection rod (75) makes the second heating rod (77) lean against the left side of the circuit board.

2. The circuit board heat resistance performance testing equipment according to claim 1, characterized in that: A door (12) is hingedly connected to the front end of the detection cabin (1).

3. The circuit board heat resistance performance testing equipment according to claim 2, characterized in that: A sealing plate (13) is fixed to the rear end of the detection chamber (1), and a jog button (14) is installed on the front of the sealing plate (13). The jog button (14) is located on the movement path of the circuit board, and the jog button (14) controls the first heating rod (74) and the second heating rod (77) to be powered on and work.

4. The circuit board heat resistance performance testing equipment according to claim 3, characterized in that: A push plate (15) close to the sealing plate (13) is provided in the detection chamber (1), and a spring seat (16) is connected between the rear of the push plate (15) and the front of the sealing plate (13). Under the support of the spring seat (16), a movable space (17) is formed between the push plate (15) and the sealing plate (13).

5. The circuit board heat resistance performance testing device according to claim 4, characterized in that: A second camera (18) is fixed on the left wall of the detection cabin (1), and a first camera (19) is fixed on the right wall of the detection cabin (1). The first camera (19) faces the first heating rod (74), and the second camera (18) faces the second heating rod (77). A display screen (20) is fixed on the outside of the detection cabin (1), and the first camera (19) and the second camera (18) are connected to the display screen (20) by circuit.

6. The circuit board heat resistance performance testing device according to claim 5, characterized in that: The first wheel groups (2) are located at two positions on the left and right, and a first gap (21) located at the front side is formed between the two first wheel groups (2); the second wheel groups (3) are located at two positions on the left and right, and a second gap (22) located at the rear side and on the same straight line as the first gap (21) at the front side is formed between the two second wheel groups (3).

7. The circuit board heat resistance performance testing device according to claim 6, characterized in that: The first wheel set (2) and the second wheel set (3) are both composed of a roller unit and a wheel frame, and the rollers are mounted on the wheel frame in an elastically connected manner, so that the left and right roller units at the same end can be adjusted left and right.

8. A method for detecting heat resistance of a circuit board, characterized in that: The circuit board heat resistance testing device according to claim 1 comprises the following steps: Step S01, when testing the thermal conductivity of a circuit board, positioning a first type of circuit board to be tested between two of the first wheel groups (2) and two of the second wheel groups (3); Step S02, passing electric current through the first heating rod (74) and the second heating rod (77) for heating, wherein the first heating rod (74) heats the first circuit board from the right side to the left, and the second heating rod (77) heats the first circuit board from the left side to the right, until two detection points on the first circuit board are thermally penetrated, and the time taken is recorded; Step S03, remove the first type of circuit board to be tested, replace it with the second type of circuit board to be tested, repeat steps S01 and S02, perform thermal penetration on two test points on the second type of circuit board, and record the time taken; Step S04, comparing the time taken by the two circuit boards for thermal penetration, obtaining the heat resistance performance, and completing the comparative test.

Images