Circuit board detection method

Abstract

The invention discloses a circuit board detection method, which comprises the following steps of: 1, starting a device, sequentially placing circuit boards on the surface of a conveying roller, and moving the circuit boards to the lower end of a detection structure by the conveying roller at the moment; step 2, the detection structure detects the circuit board; and step 3, after the detection is completed, the circuit board is moved away by the conveying roller. According to the device, qualified or unqualified circuit boards can be automatically screened under the cooperation of the detection structure and the conveying rolling shaft, the screening speed of the circuit boards is effectively increased, and the labor intensity of workers is reduced.

Description

Technical Field

[0001] The invention relates to a circuit board detection technology, in particular to a circuit board detection method. Background Art

[0002] With the continuous updating of electronic products, circuit boards are widely used as carriers of various electronic components. When inspecting circuit boards, one method is to place the circuit board to be tested in an etching tank filled with etching liquid, and obtain the result by observing the color change on the surface of the etching board, that is, if the copper reacts chemically with the etching liquid and changes color, it is unqualified, otherwise, it is qualified if it does not change color. A circuit board detection device provided according to the existing technology on the market is used to detect whether there is residual photoresist on the surface of the conductive layer of the circuit board. The circuit board detection device includes a cylinder, a cover, a liquid guide core and an etching liquid. The cylinder has a main body and a fixed part that are connected. The cover is connected to one end of the main body away from the fixed part, and together with the cylinder, it forms a receiving chamber. The etching liquid is received in the receiving chamber and is used to react chemically with the conductive layer to change the color of the conductive layer. The liquid guide core includes a guide core and a detection core that are connected. The detection core is fixed to one end of the fixed part away from the main body. The guide core extends from the detection core into the receiving chamber, and is used to guide the etching liquid in the receiving chamber to the detection core, so that when the detection core contacts the circuit board, it can detect whether there is residual photoresist on the surface of the conductive layer of the circuit board according to whether the conductive layer changes color.

[0003] Although the device detects whether the circuit board is qualified by wiping, the device needs to be manually held for detection. At the same time, the detection head of the device is easily worn out with use, resulting in uncontrollable outflow of etching liquid. Therefore, a circuit board detection method is provided to solve the above problems. Summary of the invention

[0004] To achieve the above object, the present invention provides the following technical solutions: A circuit board detection method comprises the following steps: Step 1: Start the device and place the circuit boards on the surface of the conveying roller in turn. The conveying roller moves the circuit boards to the lower end of the detection structure. Step 2: The detection structure detects the circuit board; Step 3: After the inspection is completed, the conveyor roller moves the circuit board away.

[0005] Furthermore, a detection structure is provided at the upper end of the conveying roller, and the detection structure includes a detection bracket provided at the upper end of the conveying roller, a detection box body is provided at the lower end of the top plate of the detection bracket, four vertical hydraulic rods are provided at the upper end of the detection box body, and slide rails are provided at the upper ends of the four vertical hydraulic rods. A storage box is provided on one side of the conveying roller, a slide rod is provided inside the storage box, a float is provided on the outer wall of the slide rod, and an alarm is provided on the upper surface of the storage box.

[0006] Furthermore, the detection box body is square in shape as a whole, and a detection head is provided on one side of the detection box body, one side of the detection head is in contact with the outer wall of the detection box body, the upper surface of the detection box body is in contact with the output ends of the vertical hydraulic rods, and a transverse hydraulic rod is provided on one side of the detection box body, the output end of the transverse hydraulic rod is in contact with the outer wall of one side of the detection box body, the side of the transverse hydraulic rod away from the output end is in contact with the lower surface of the top plate of the detection bracket, and the outer wall of the detection bracket is in contact with the outer wall of the conveying roller.

[0007] Furthermore, the outer wall of the side of the slide rail away from the vertical hydraulic rod is in contact with the lower surface of the top plate of the detection bracket, a liquid guide plate is provided at the inner upper end of the detection box body, a sponge fixing grid is provided at the lower end of the liquid guide plate, a sponge body is provided inside the sponge fixing grid, the outer wall of the sponge body is in contact with the inner wall of the sponge fixing grid, a smear fixing plate is provided at the lower end of the sponge fixing grid, four smearing heads are provided through the upper surface of the smear fixing plate, and one end of the four smearing heads is in contact with the outer wall of the sponge body.

[0008] Furthermore, a smear fixing plate is provided at the lower end of the sponge fixing grid, and four smear heads are arranged through the upper surface of the smear fixing plate, and one end of the four smear heads are in contact with the outer wall of the sponge body. A pump body is provided at the center of the upper surface of the detection box body, and the output end of the pump body passes through the upper surface of the detection box body, and a connecting hose is sealedly connected to the side of the pump body away from the output end.

[0009] Furthermore, a fixed plate body is provided at the lower end of the float, and the upper surface of the fixed plate body is in contact with the outer wall of the float. A trigger sensor is provided on one side of the upper surface of the fixed plate body, and the upper surface of the trigger sensor is in contact with the lower surface of the float. The side of the connecting hose away from the detection box body passes through the upper surface of the storage box and extends to the upper surface of the bottom plate of the storage box.

[0010] Furthermore, the alarm is electrically connected to the trigger sensor, a feeding port is opened on one side of the upper surface of the storage box, a first fixed block is arranged on one side of the upper surface of the conveying roller at the lower end of the detection bracket, and a first hydraulic rod is arranged on the side of the first fixed block close to the inner wall of the conveying roller, and the output end of the first hydraulic rod is in contact with the outer wall of one side of the first fixed block.

[0011] Furthermore, the side of the first hydraulic rod away from the output end contacts the inner wall of one side of the conveying roller, and the side of the first fixed block away from the first hydraulic rod is provided with an L-shaped fixed block, and the lower end of the L-shaped fixed block contacts the output end of the second hydraulic rod.

[0012] Furthermore, a third hydraulic rod is arranged on one side of the inner wall of the L-shaped fixing block, a second fixing block is arranged on the output end of the third hydraulic rod, and a side of the third hydraulic rod away from the output end contacts one side of the inner wall of the L-shaped fixing block and is connected by a bracket.

[0013] Furthermore, a position sensor is provided on an outer wall of one side of the inner wall of the conveying roller close to the first fixed block.

[0014] In summary, the present invention mainly has the following beneficial effects: The device can automatically screen qualified or unqualified circuit boards with the cooperation of the detection structure and the conveying roller, effectively improving the screening speed of the circuit boards and reducing the labor intensity of the staff.

[0015] Detection structure: the vertical hydraulic rod starts to work, causing the detection box to move downward. At the same time, the pump body starts to work, and the pump body transports the etching liquid in the storage box into the detection box. When the transportation reaches a certain amount, the pump body stops working. After the etching liquid enters the detection box, it first contacts the liquid guide plate, and flows into the sponge fixing grid from several holes opened through the upper surface of the liquid guide plate; the sponge body in the sponge fixing grid absorbs the etching liquid, and then is absorbed by the smearing head, so that the smearing head is filled with etching liquid, and the detection box moves downward until the smearing head contacts the circuit board, and then the horizontal hydraulic rod starts to work, and its output end extends. Under the action of the slide rail, the smearing head moves on the surface of the circuit board to apply the etching liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a flow chart of the present invention; Figure 2 It is an axonometric view of the overall appearance of the present invention; Figure 3 This is a plan view related to the first fixing block of the present invention; Figure 4 It is a relevant isometric view of the detection box body of the present invention; Figure 5 An exploded view of the detection box body related structure of the present invention; Figure 6 A plan perspective view of a storage box of the present invention; Figure 7 for Figure 2 Enlarged view of the node at A in the middle; Figure 8 for Figure 5 Enlarged view of node B in the middle.

[0017] Description of the drawings: 100, conveying roller; 200, detection structure; 211, detection bracket; 221, detection box body; 222, vertical hydraulic rod; 223, horizontal hydraulic rod; 224, slide rail; 225, pump body; 226, connecting hose; 230, smear fixing plate; 231, smear head; 232, sponge body; 233, sponge fixing grid; 234, liquid guide plate; 241, storage box; 242, slide rod; 243, feeding port; 244, float; 245, fixed plate body; 246, trigger sensor; 247, alarm; 25, detection head; 300, first fixed block; 311, first hydraulic rod; 312, second hydraulic rod; 313, L-shaped fixed block; 314, third hydraulic rod; 315, second fixed block; 316, position sensor. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Example

[0019] The device is provided with an external control panel, which can select a conventional multifunctional control device with a screen display function, and realize normal operation based on the corresponding setting of matching programs in terms of functions. At the same time, the position and number of the coating heads 231 can be changed according to the actual needs of the circuit board, and all these changes and deformations should fall within the scope of protection of the claims of the present invention.

[0020] See also Figure 1-Figure 8 , a circuit board detection method, comprising the following steps: Step 1: Start the device and place the circuit boards on the surface of the conveying roller 100 in sequence. The conveying roller 100 then moves the circuit boards to the lower end of the detection structure 200. Step 2: The detection structure 200 detects the circuit board; Step 3: After the inspection is completed, the conveying roller 100 moves the circuit board away.

[0021] See also Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8 The upper end of the conveying roller 100 is provided with a detection structure 200, and the detection structure 200 is used to apply the etching solution and detect the chemical reaction of the etching solution. The conveying roller 100 adopts the existing technical structure and is used to transport the circuit board; The detection structure 200 includes a detection bracket 211 disposed at the upper end of the conveying roller 100, the outer wall of the detection bracket 211 contacts the outer wall of the conveying roller 100 and is bolted, and a detection box body 221 is disposed at the lower end of the top plate of the detection bracket 211. The detection box body 221 is square in shape, has an open lower end and is hollow inside, and a detection head 25 is disposed on one side of the detection box body 221. The detection head 25 adopts an existing visual detection device, and one side of the detection head 25 contacts the outer wall of the detection box body 221 and is bolted. Four vertical hydraulic rods 222 are arranged at the upper end of the box body 221. The upper surface of the detection box body 221 and the output ends of the vertical hydraulic rods 222 are in contact with each other and are bolted together. A transverse hydraulic rod 223 is arranged on one side of the detection box body 221. The transverse hydraulic rod 223 is used to drive the detection box body 221 to move. The output end of the transverse hydraulic rod 223 is in contact with the outer wall of one side of the detection box body 221 and is connected to the bracket. The side of the transverse hydraulic rod 223 away from the output end is in contact with the lower surface of the top plate of the detection bracket 211 and is connected to the bracket. A slide rail 224 is provided at the upper end of the vertical hydraulic rod 222. The side of the four vertical hydraulic rods 222 away from the output end is in contact with the outer wall of the slide rail 224 and is connected to the bracket. The outer wall of the side of the slide rail 224 away from the vertical hydraulic rod 222 is in contact with the lower surface of the top plate of the detection bracket 211 and is bolted. A liquid guide plate 234 is provided at the upper end of the inner part of the detection box body 221. A sponge fixing grid 233 is provided at the lower end of the liquid guide plate 234. A sponge body 232 is provided inside the sponge fixing grid 233. The outer wall of the sponge body 232 is in contact with the inner wall of the sponge fixing grid 233 and is movably connected. The upper surface of the sponge fixing grid 233 is in contact with the lower surface of the liquid guide plate 234 and is fixedly connected. A smear fixing plate 230 is provided at the lower end of the sponge fixing grid 233. Four smear heads 231 are arranged through the upper surface of the smear fixing plate 230, one end of each of the four smear heads 231 is in contact with the outer wall of the sponge body 232, and each of the four smear heads 231 is snap-connected with the smear fixing plate 230. A pump body 225 is arranged at the center of the upper surface of the detection box body 221, and the output end of the pump body 225 passes through the upper surface of the detection box body 221, and a connecting hose 226 is sealed and connected to the side of the pump body 225 away from the output end; A first fixed block 300 is provided at the lower end of the detection bracket 211 on one side of the upper surface of the conveying roller 100, and a first hydraulic rod 311 is provided on the side of the first fixed block 300 close to the inner wall of the conveying roller 100. The output end of the first hydraulic rod 311 contacts the outer wall of one side of the first fixed block 300 and is connected to the bracket. The side of the first hydraulic rod 311 away from the output end contacts the inner wall of one side of the conveying roller 100 and is connected to the bracket. An L-shaped fixed block 313 is provided on the side of the first fixed block 300 away from the first hydraulic rod 311. The lower end of the L-shaped fixed block 313 contacts the output end of the second hydraulic rod 312 and is connected to the bracket. A side away from the output end of 12 is in contact with the bottom plate of the conveying roller 100 and is connected by a bracket, a third hydraulic rod 314 is provided on one side of the inner wall of the L-shaped fixed block 313, a second fixed block 315 is provided on the output end of the third hydraulic rod 314, an outer wall on one side of the second fixed block 315 is in contact with the output end of the third hydraulic rod 314 and is connected by a bracket, a side away from the output end of the third hydraulic rod 314 is in contact with one side of the inner wall of the L-shaped fixed block 313 and is connected by a bracket, a position sensor 316 is provided on the outer wall of the inner wall of the conveying roller 100 close to the first fixed block 300, and the position sensor 316 is in contact with the inner wall of the conveying roller 100 and is bolted.

[0022] When quality inspection of circuit boards is required: S1: The staff starts the device through the external control panel, and then the staff places the circuit boards on the conveying roller 100 in sequence; S2: When the conveying roller 100 conveys the circuit board to the lower end of the detection structure 200, it is first detected by the detection head 25. Then, when the circuit board is detected by the position sensor 316, the conveying roller 100 stops working, and then the second hydraulic rod 312 starts working to drive the L-shaped fixed block 313 to move. When the L-shaped fixed block 313 is flush with the circuit board, the first hydraulic rod 311 and the third hydraulic rod 314 start working to drive the first fixed block 300 and the second fixed block 315 to move to clamp the circuit board. S3: The detection structure 200 starts to work. First, the vertical hydraulic rod 222 starts to work, and its output end extends to move the detection box body 221 downward. At the same time, the pump body 225 starts to work, and the pump body 225 transports the etching liquid in the storage box 241 to the detection box body 221. When the transport reaches a certain amount, the pump body 225 stops working; S4: After the etching liquid enters the detection box body 221, it first contacts the liquid guide plate 234, and flows into the sponge fixing grid 233 from a plurality of holes formed on the upper surface of the liquid guide plate 234; S5: The sponge body 232 in the sponge fixing grid 233 absorbs the etching liquid, and under the action of gravity, the etching liquid slowly sinks to the lower end, and then is absorbed by the smearing head 231, so that the smearing head 231 is filled with the etching liquid; S6: The detection box body 221 moves downward until the coating head 231 contacts the circuit board, and then the horizontal hydraulic rod 223 starts to work, and its output end extends. Under the action of the slide rail 224, the coating head 231 moves on the surface of the circuit board to coat the etching liquid; S7: After the coating is completed, the first hydraulic rod 311, the second hydraulic rod 312 and the third hydraulic rod 314 are retracted to stop clamping the circuit board. At the same time, the detection box 221 is retracted, and then the detection head 25 detects whether the circuit board is qualified; S8: Unqualified: The output end of the first hydraulic rod 311 extends, the first fixed block 300 pushes the circuit board to one side, and then the conveying roller 100 starts to work, so that the circuit board moves to the unqualified position; Qualified; the conveying roller 100 starts to work and continues to move the circuit board.

[0023] The device can automatically detect the circuit board and judge whether the detected circuit board is qualified, which effectively reduces the labor intensity of the staff.

[0024] See also Figure 2 and Figure 6 A storage box 241 is provided on one side of the conveying roller 100, a slide bar 242 is provided inside the storage box 241, both ends of the slide bar 242 are in contact with the inner wall of the storage box 241, a float 244 is sleeved on the outer wall of the slide bar 242, the inner wall of the float 244 is in contact with the outer wall of the slide bar 242 and is slidably connected, and a fixing plate body 245 is provided at the lower end of the float 244; The upper surface of the fixed plate body 245 is in contact with the outer wall of the float 244, the inner wall of the fixed plate body 245 is in contact with the lower end of the outer wall of the slide bar 242 and is fixedly connected, and a trigger sensor 246 is arranged on one side of the upper surface of the fixed plate body 245. The trigger sensor 246 adopts the existing technical structure, which is relatively mature and will not be described in detail here. The upper surface of the trigger sensor 246 is in contact with the lower surface of the float 244, and the side of the connecting hose 226 away from the detection box body 221 passes through the upper surface of the storage box 241 and extends to the upper surface of the bottom plate of the storage box 241. An alarm 247 is arranged on the upper surface of the storage box 241, and the lower surface of the alarm 247 is in contact with the upper surface of the storage box 241 and is connected to the bracket. The alarm 247 is electrically connected to the trigger sensor 246, and a feeding port 243 is opened on one side of the upper surface of the storage box 241; When the liquid in the storage tank 241 decreases: S1: As the etching liquid in the storage box 241 decreases, the float 244 gradually descends; S2: When the lower surface of the float 244 contacts the trigger sensor 246, the trigger sensor 246 causes the alarm 247 electrically connected thereto to start working; S3: At this time, the staff opens the feeding port 243 to fill the storage box 241.

[0025] The device can effectively remind workers to add materials, reducing detection errors.

[0026] The workflow of the present invention is: When quality inspection of circuit boards is required: First, the staff starts the device through the external control panel, and then the staff places the circuit boards on the conveying roller 100 in sequence; Then, when the conveying roller 100 conveys the circuit board to the lower end of the detection structure 200, it is first detected by the detection head 25. Then, when the circuit board is detected by the position sensor 316, the conveying roller 100 stops working. Then, the second hydraulic rod 312 starts working to drive the L-shaped fixed block 313 to move. When the L-shaped fixed block 313 is flush with the circuit board, the first hydraulic rod 311 and the third hydraulic rod 314 start working to drive the first fixed block 300 and the second fixed block 315 to move to clamp the circuit board. Then, the detection structure 200 starts to work. First, the vertical hydraulic rod 222 starts to work, and its output end extends to move the detection box body 221 downward. At the same time, the pump body 225 starts to work, and the pump body 225 transports the etching liquid in the storage box 241 to the detection box body 221. When the transport reaches a certain amount, the pump body 225 stops working. Secondly, after the etching liquid enters the detection box body 221, it first contacts the liquid guide plate 234, and flows into the sponge fixing grid 233 from the plurality of holes formed on the upper surface of the liquid guide plate 234; Then, the sponge body 232 in the sponge fixing grid 233 absorbs the etching liquid, and under the action of gravity, the etching liquid slowly sinks to the lower end, and is then absorbed by the smearing head 231, so that the smearing head 231 is filled with the etching liquid; Secondly, the detection box body 221 moves down until the coating head 231 contacts the circuit board, and then the horizontal hydraulic rod 223 starts to work, and its output end extends. Under the action of the slide rail 224, the coating head 231 moves on the surface of the circuit board to coat the etching liquid.

[0027] Afterwards, after the coating is completed, the first hydraulic rod 311, the second hydraulic rod 312 and the third hydraulic rod 314 are retracted to stop clamping the circuit board. At the same time, the detection box 221 is retracted, and then the detection head 25 detects whether the circuit board is qualified; Finally, unqualified: the output end of the first hydraulic rod 311 extends, the first fixed block 300 pushes the circuit board to one side, and then the conveying roller 100 starts to work to move the circuit board to the unqualified position; Pass: The conveyor roller 100 starts to work and continues to move the circuit board.

[0028] When the liquid in the storage tank 241 decreases: First, as the etching solution in the storage box 241 decreases, the float 244 gradually descends; Then, when the lower surface of the float 244 contacts the trigger sensor 246, the trigger sensor 246 causes the alarm 247 electrically connected thereto to start working; Finally, the staff opens the filling port 243 to fill the storage box 241.

[0029] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A circuit board detection method, characterized in that: The following steps are involved: Step 1: placing the circuit boards on the surface of the conveying roller (100) in sequence, and then the conveying roller (100) moves the circuit boards to the lower end of the detection structure (200); Step 2: The detection structure (200) detects the circuit board; Step 3: After the inspection is completed, the conveyor roller (100) moves the circuit board away.

2. A circuit board detection method according to claim 1, characterized in that: A detection structure (200) is arranged at the upper end of the conveying roller (100), and the detection structure (200) includes a detection bracket (211) arranged at the upper end of the conveying roller (100), a detection box body (221) is arranged at the lower end of the top plate of the detection bracket (211), four vertical hydraulic rods (222) are arranged at the upper end of the detection box body (221), and slide rails (224) are arranged at the upper ends of the four vertical hydraulic rods (222), a storage box (241) is arranged on one side of the conveying roller (100), a slide bar (242) is arranged inside the storage box (241), a float (244) is sleeved on the outer wall of the slide bar (242), and an alarm (247) is arranged on the upper surface of the storage box (241).

3. A circuit board detection method according to claim 2, characterized in that: The detection box body (221) is square in shape as a whole. A detection head (25) is provided on one side of the detection box body (221). One side of the detection head (25) is in contact with the outer wall of the detection box body (221). The upper surface of the detection box body (221) is in contact with the output ends of the vertical hydraulic rod (222). A transverse hydraulic rod (223) is provided on one side of the detection box body (221). The output end of the transverse hydraulic rod (223) is in contact with the outer wall of one side of the detection box body (221). The side of the transverse hydraulic rod (223) away from the output end is in contact with the lower surface of the top plate of the detection bracket (211). The outer wall of the detection bracket (211) is in contact with the outer wall of the conveying roller (100).

4. A circuit board detection method according to claim 2, characterized in that: The outer wall of the side of the slide rail (224) away from the vertical hydraulic rod (222) contacts the lower surface of the top plate of the detection bracket (211); a liquid guide plate (234) is provided at the upper end of the interior of the detection box body (221); a sponge fixing grid (233) is provided at the lower end of the liquid guide plate (234); a sponge body (232) is provided inside the sponge fixing grid (233); the outer wall of the sponge body (232) contacts the inner wall of the sponge fixing grid (233); a smear fixing plate (230) is provided at the lower end of the sponge fixing grid (233); four smearing heads (231) are provided through the upper surface of the smearing fixing plate (230); one end of each of the four smearing heads (231) contacts the outer wall of the sponge body (232).

5. A circuit board detection method according to claim 4, characterized in that: A coating fixing plate (230) is arranged at the lower end of the sponge fixing grid (233), and four coating heads (231) are arranged through the upper surface of the coating fixing plate (230), and one end of each of the four coating heads (231) is in contact with the outer wall of the sponge body (232). A pump body (225) is arranged at the center of the upper surface of the detection box body (221), and the output end of the pump body (225) passes through the upper surface of the detection box body (221), and a connecting hose (226) is hermetically connected to the side of the pump body (225) away from the output end.

6. A circuit board detection method according to claim 5, characterized in that: A fixed plate body (245) is provided at the lower end of the float (244), and the upper surface of the fixed plate body (245) is in contact with the outer wall of the float (244). A trigger sensor (246) is provided on one side of the upper surface of the fixed plate body (245), and the upper surface of the trigger sensor (246) is in contact with the lower surface of the float (244). The side of the connecting hose (226) away from the detection box body (221) passes through the upper surface of the storage box (241) and extends to the upper surface of the bottom plate of the storage box (241).

7. A circuit board detection method according to claim 2, characterized in that: The alarm (247) is electrically connected to the trigger sensor (246); a feeding port (243) is provided on one side of the upper surface of the storage box (241); a first fixed block (300) is provided on one side of the upper surface of the conveying roller (100) at the lower end of the detection bracket (211); a first hydraulic rod (311) is provided on one side of the first fixed block (300) close to the inner wall of the conveying roller (100); an output end of the first hydraulic rod (311) is in contact with an outer wall of one side of the first fixed block (300).

8. A circuit board detection method according to claim 7, characterized in that: The side of the first hydraulic rod (311) away from the output end contacts the inner wall of one side of the conveying roller (100), and the side of the first fixing block (300) away from the first hydraulic rod (311) is provided with an L-shaped fixing block (313), and the lower end of the L-shaped fixing block (313) contacts the output end of the second hydraulic rod (312).

9. A circuit board detection method according to claim 2, characterized in that: A third hydraulic rod (314) is provided on one side of the inner wall of the L-shaped fixing block (313); a second fixing block (315) is provided on the output end of the third hydraulic rod (314); a side of the third hydraulic rod (314) away from the output end is in contact with one side of the inner wall of the L-shaped fixing block (313) and is connected to a bracket.

10. A circuit board detection method according to claim 2, characterized in that: A position sensor (316) is provided on an outer wall of one side of the inner wall of the conveying roller (100) close to the first fixing block (300).

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