A circuit board quality inspection process using a double-layer assembly line

Abstract

The present invention discloses a double-layer assembly line and quality inspection process for circuit board quality inspection. The double-layer assembly line includes: a rack, a distribution assembly line, a reflow assembly line, a distribution drive motor, and a reflow drive motor. The transmission direction of the distribution assembly line is opposite to that of the reflow assembly line. The distribution assembly line includes a microscopic inspection area, a process product inspection area, a finished product sampling inspection area, a counting periodic area, and a scanning and inputting packaging area. The reflow assembly line is correspondingly located below the microscopic inspection area, the process product inspection area, and the finished product sampling inspection area. The present invention can ensure the normal transmission of qualified products and the reflow of defective products by setting up the distribution assembly line and the reflow assembly line with upper and lower intervals. Through the setting of the double-layer assembly line, each inspection link is effectively connected together, the inspection efficiency of different inspection processes is improved, and the labor intensity of employees is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board quality inspection, and in particular to a double-layer production line and a quality inspection process for circuit board quality inspection. Background Art

[0002] Flexible printed circuit boards are referred to as soft boards. They are made into conductor circuit patterns on the surface of a flexible substrate using photo-imaging pattern transfer and etching processes. The surface and inner layer of double-sided and multi-layer circuit boards are electrically connected through metallized holes, and the surface of the circuit pattern is insulated. After the flexible circuit board is produced, it needs to be tested to see if it is qualified, and the bad position and bad condition of the circuit board need to be analyzed. The inspection of flexible circuit boards includes multiple links such as microscopic inspection / special inspection, process quality inspection (MQC), finished product quality inspection (FQC), factory sampling inspection (OQC), packaging and shipment, etc., but not all flexible circuit boards need to undergo every test, but are inspected according to specific order requirements.

[0003] Traditional flexible circuit board inspection usually sets up multiple inspection areas corresponding to different inspection processes. For example, a number of fixed microscopic inspection stations are set up in the microscopic inspection area, a number of quality inspection stations are set up in the process quality inspection area, and a number of factory inspection stations are set up in the finished product factory sampling inspection area. Each employee performs his or her duties in his or her respective job position. After microscopic inspection, the flexible circuit board is classified according to good and bad quality. For example, if all circuit board units in the same flexible circuit board are all qualified or have one defective, two defective, three defective, four defective, five or more defective, they are packed in different boxes. According to the specific requirements of the order, defective products with different numbers of pieces are distributed to different processing personnel, and qualified products and defective pieces that meet the requirements are distributed to the process quality inspection area. The staff of the process quality inspection area inspects the products again and classifies them according to qualified and unqualified products. Unqualified products are returned to the microscopic inspection area or the defective product recycling area, and qualified products are sent to the finished product quality inspection area for full inspection. Unqualified products are returned, and qualified products are transferred to the finished product factory sampling inspection area for sampling inspection. After passing the inspection, they are packaged and shipped. During the entire inspection process, products are transferred manually, which not only consumes workers' time and energy and reduces inspection efficiency, but also easily causes new defects in circuit boards due to collisions or shaking during the transportation process. The low degree of automation requires further improvement. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a double-layer assembly line for circuit board quality inspection which can improve work efficiency, reduce labor intensity and improve the degree of automation.

[0005] In order to achieve the above object, the solution of the present invention is:

[0006] A double-layer assembly line for circuit board quality inspection comprises a frame, a distribution assembly line arranged on the top of the frame, a reflow assembly line arranged on the frame and spaced below the distribution assembly line, a distribution drive motor for driving the distribution assembly line, and a reflow drive motor for driving the reflow assembly line, wherein the transmission direction of the distribution assembly line is opposite to that of the reflow assembly line, the distribution assembly line comprises a microscopic inspection area, a process quality inspection area, a finished product sampling inspection area, a counting and periodicity area, and a scanning and inputting packaging area, and the reflow assembly line is correspondingly located below the microscopic inspection area, the process quality inspection area, and the finished product sampling inspection area.

[0007] Furthermore, the distribution line includes a first conveyor belt, a conveyor roller and a second conveyor belt, the first conveyor belt is arranged in the mirror inspection area and the process inspection area, the conveyor roller is arranged in the finished product sampling area and is located between the first conveyor belt and the second conveyor belt, and the second conveyor belt is arranged in the counting period area and the scanning and recording packaging area; the distribution drive motor includes a first motor and a second motor, the first motor is arranged on the line head side of the distribution line and is located below the return line, and the second motor is arranged on the line tail side of the distribution line, the first motor is connected to the first conveyor belt through the first conveyor chain, the second motor is connected to the second conveyor belt through the second conveyor chain, the conveyor roller is an unpowered roller, and the return drive motor is connected to the return line through the return conveyor chain.

[0008] Furthermore, the first motor, the second motor and the reflux drive motor are respectively connected to a frequency converter.

[0009] Furthermore, the frame is respectively provided with a motor installation cabinet at the bottom of the head and tail of the distribution assembly line. The first motor and the reflux drive motor are arranged in the motor installation cabinet at the head of the distribution assembly line, and the second motor is arranged in the motor installation cabinet at the tail of the distribution assembly line. Arranging the first motor, the second motor and the reflux drive motor in the motor installation cabinet can ensure the operation of the product and the safety of employees, while making the appearance of the entire double-layer assembly line beautiful.

[0010] Furthermore, a block is set between the finished product sampling area and the counting and periodic area of ​​the distribution line, a block is set between the counting and periodic area and the scanning and input packaging area, a block is set at the end of the second conveyor belt, and a block is also set at the end of the return line.

[0011] Furthermore, the first conveyor belt and the second conveyor belt of the distribution line and both sides of the return line are equipped with retaining edges.

[0012] After adopting the above structure, the double-layer assembly line for circuit board quality inspection of the present invention is provided with a distribution assembly line and a reflow assembly line with upper and lower intervals. The distribution assembly line is used to transmit the products to be inspected or qualified products, and the reflow assembly line is used to reflow the defective products. It can ensure the normal transmission of qualified products and the reflow of defective products. Through the setting of the double-layer assembly line, each inspection link is effectively connected together, the inspection efficiency of different inspection processes is improved, the labor intensity of employees is reduced, and secondary damage to products is avoided. And the upper and lower intervals of the distribution assembly line and the reflow assembly line are arranged on the same rack, which can save installation space and facilitate employee operation.

[0013] The present invention also discloses a circuit board quality inspection process using the double-layer assembly line, which includes the following steps:

[0014] Step 1: The delivery staff arranges the products to be inspected according to the plan and sets the placement requirements for the products to be inspected and the products that have been inspected;

[0015] Step 2: Determine whether the product needs microscopic inspection / special inspection based on the process sheet or customer requirements, including:

[0016] a. If microscopic inspection / special inspection is required, the delivery staff will place the products to be inspected at the end of the distribution line according to the placement requirements. The inspectors in the microscopic inspection area and process product inspection area will take the materials from the distribution line for microscopic inspection and / or special inspection;

[0017] b. After the microscopic inspection and / or special inspection is completed, the inspector places the product on the reflow line to the end of the line according to the placement requirements;

[0018] c. The deliveryman receives the product. If the product is placed horizontally, he / she will determine whether it is a returned product after inspection by the finished product inspection personnel in the finished product sampling area that has not been accepted by the corresponding workstation or a product that has not been inspected by the finished product inspection personnel. If it is a returned product, it will be directly distributed to the corresponding workstation personnel. If it is an uninspected product, jump to step 3.

[0019] d. If microscopic examination / special examination is not required, skip to step 3 directly;

[0020] Step 3: The delivery person places the product on the distribution line according to the placement requirements and reminds the inspector at the corresponding station to collect the material;

[0021] Step 4: Finished product inspectors and process product inspectors only take the uninspected products placed on the distribution line according to the placement requirements;

[0022] Step 5: After the finished product inspectors and process inspectors have completed their work, they place the inspected products on the distribution line and flow them to the finished product sampling area according to the placement requirements;

[0023] Step 6: The finished product is inspected by the factory inspector, including

[0024] a. If the random inspection is OK, place the product on the second conveyor belt of the distribution line and flow it to the counting and periodic area;

[0025] b. If it is NG, the finished product factory inspector reminds the corresponding inspection station and places the returned products horizontally on the reflow line 3, and flows the returned products to the corresponding inspection station;

[0026] c. If the remaining products are uninspected products placed according to the placement requirements, remove the products from the distribution line and place them on the return belt line according to the placement requirements to continue to return. They can be picked up by the finished product inspector or the process inspector during the process or flow to the end of the return line and then fed by the delivery staff;

[0027] Step 7: Points are divided into periods, including:

[0028] a. If OK, place the product on the second conveyor belt of the distribution line and flow to the scanning and packaging area;

[0029] b. If NG, it will be transferred to the designated personnel for processing;

[0030] Step 8: Scan and enter the packaging, and place the packaged product in the corresponding packaging area. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a side schematic diagram of the assembly line of the present invention.

[0032] Figure 2 It is a top view schematic diagram of the assembly line of the present invention.

[0033] Figure 3 It is a front schematic diagram of the present invention.

[0034] Figure 4 It is a schematic diagram of the process of microscopic examination and / or special examination of the present invention.

[0035] Figure 5 It is a schematic diagram of the process quality inspection of the present invention.

[0036] Figure 6 It is a schematic diagram of the process of finished product quality inspection of the present invention. DETAILED DESCRIPTION

[0037] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0038] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “X”, “Y”, “Z”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0043] like Figures 1 to 3 As shown, the present invention discloses a system for circuit board quality inspection, which includes a frame 1, a distribution line 2 arranged on the top of the frame, a reflow line 3 arranged on the frame 1 and spaced below the distribution line 2, a distribution drive motor for driving the distribution line 2, and a reflow drive motor 5 for driving the reflow line 3, wherein the transmission direction of the distribution line 2 is opposite to the transmission direction of the reflow line 3, the distribution line 2 includes a mirror inspection area 21, a process quality inspection area 22, a finished product sampling area 23, a counting and periodic area 24 and a scanning and recording packaging area 25 which are arranged in sequence from the line head A to the line tail Z, and the reflow line 3 is correspondingly located below the mirror inspection area 21, the process quality inspection area 22, and the finished product sampling area 23.

[0044] The distribution line 2 includes a first conveyor belt 2A, a conveyor roller 2B and a second conveyor belt 2C. The first conveyor belt 2A is arranged in the mirror inspection area 21 and the process inspection area 22, the conveyor roller 2B is arranged in the finished product sampling area 23, and the second conveyor belt 2C is arranged in the counting period area 24 and the scanning and recording packaging area 25; the distribution drive motor includes a first motor 41 and a second motor 42. The first motor 41 is arranged on the motor installation cabinet on the side of the line head A of the distribution line 2 and is located below the return line 3. The motor installation cabinet is arranged on the frame 1, and the second motor 42 is arranged on the motor installation cabinet on the side of the line tail Z of the distribution line 2. The first motor 41 and the second motor 42 are respectively connected to a frequency converter. The first motor 41 is connected to the first conveyor belt 2A through the first conveyor chain 43, and the second motor 42 is connected to the second conveyor belt 2C through the second conveyor chain 44. The output torque of the first motor 41 and the second motor 42 can be adjusted by the frequency converter, thereby controlling the transmission speed of the first conveyor belt 2A and the second conveyor belt 2C.

[0045] The conveying roller 2B is an unpowered roller. After the product is transferred from the first conveying belt 21 to the conveying roller 2B, the product will not move down automatically, but needs to be manually moved. Only qualified products will be transferred to the second conveying belt 2B, and unqualified products will be returned to the inspector in front from the return line 3 at the bottom of the distribution line 2. The conveying roller 2B is the buffer section of the distribution line 2. The conveying roller 2B has good weight bearing capacity and is not easy to wear, and can be used as the connecting section of the first conveying belt 2A and the second conveying belt 2B.

[0046] like Figure 4 As shown, a block is set between the finished product sampling area 23 and the counting and periodizing area 24 to block the products after the finished product quality inspection (FQC) and the process quality inspection (MQC). A block is set between the counting and periodizing area 24 and the scanning and recording packaging area 25 to block the products that have been inspected by the finished product factory inspection (OQC) but have not yet been counted and periodized. A block is set at the end of the second conveyor belt 2C to block the products and prevent them from falling.

[0047] The tail B of the reflux assembly line 3 is flush with the head A of the distribution assembly line 2. The reflux drive motor 5 is arranged on one side of the tail B of the reflux assembly line 3 and is arranged in the same motor installation cabinet as the first motor 41. The reflux drive motor 5 is also connected to a frequency converter. The reflux drive motor 5 is connected to the drive shaft of the reflux assembly line 3 through a reflux transmission chain 51. The frequency converter connected to the reflux drive motor 5 is used to adjust the torque of the reflux drive motor 5, thereby controlling the transmission speed of the reflux assembly line 3.

[0048] The height from the bottom of the rack 1 to the distribution line 3 can be further set to 600-1000mm, preferably 800mm, and the spacing between the distribution line 2 and the return line 3 is 200-500mm, preferably 300mm. The height of the line is limited to facilitate employees to take and place products on the distribution line 2. The height of the return line 3 is within a reasonable range of operation to avoid the line being too high or too low to affect the user experience. The first drive motor 4, the first inverter, the second drive motor 5 and the second inverter are installed on the motor installation cabinet to form a protective mechanism to ensure safe use.

[0049] Both sides of the distribution line 2 and the return line 3 are equipped with side guards to prevent people from inserting their fingers into the conveyor belt. The end Z of the distribution line 2, i.e., the end of the transmission direction of the second conveyor belt 2C, and the end Y of the return line 3 are equipped with blocks to prevent the product from falling after being transmitted to the end Z and Y.

[0050] like Figures 4 to 6 As shown, the working process of the double-layer pipeline of the present invention is as follows:

[0051] Step 1: The delivery staff arranges the products that need to be inspected according to the plan;

[0052] Step 2: Determine whether the product needs microscopic inspection / special inspection based on the process sheet or customer requirements;

[0053] 1. If microscopic inspection / special inspection is required, the delivery staff will place the ingredients horizontally on the distribution line 2, and the inspectors in the microscopic inspection area and process quality inspection area will take the materials from the distribution line;

[0054] 2. After the product inspection is completed by microscopic inspection / special inspection, it is placed vertically in the turnover frame on the reflow line 3 and flows to the end of the line B;

[0055] 3. The deliveryman receives the product. If the product is placed horizontally, he / she will determine whether it is a returned product after inspection by the finished product inspection personnel in the finished product sampling area 23 but not accepted by the corresponding workstation or a product returned by the finished product inspection personnel. If it is a returned product, it will be directly distributed to the corresponding workstation personnel. If it is an uninspected product, jump to step 3.

[0056] 4. If microscopic examination / special examination is not required, jump directly to step 3;

[0057] Step 3: The delivery person places the product horizontally on the distribution conveyor belt 2 and reminds the inspector at the corresponding station to collect the material;

[0058] Step 4: The finished product quality inspector (FQC) and the process quality inspector (MQC) only take the horizontal turnover frame on the distribution line 2 (the vertical one is the inspected products transferred from the previous station);

[0059] Step 5: After the finished product quality inspector (FQC) and the process quality inspector (MQC) complete their work, they write the process code when signing and place it vertically in the turnover frame on the distribution line 2 to the finished product sampling area 23;

[0060] Step 6: Finished product factory inspection (OQC) personnel conduct random inspection:

[0061] 1. If the random inspection is OK, the product will be placed on the second conveyor belt 2C of the distribution line 2 and flow to the counting and periodic area. The counting and periodic area is used to classify qualified products. The product is printed with the customer's cycle code, some are by day, some are by week, and it is confirmed by scanning into the computer, and the number of products is counted. After the statistics are completed, it will be transferred to the next process for product packaging;

[0062] 2. If it is NG, the finished product factory inspector (OQC) reminds the corresponding inspection station and places the returned products horizontally on the reflow line 3, and flows the returned products to the corresponding inspection station;

[0063] 3. If the remaining products are horizontally placed products, they will be taken off the distribution line 2 and placed horizontally on the return belt line 3 to continue to return. They can be picked up by the finished product quality inspector (FQC) or the process quality inspector (MQC) during the process, or flow to the end of the return line 2 and then fed by the delivery staff;

[0064] Step 7: Points divided into periods

[0065] 1. If OK, place the product on the second conveyor belt of distribution line 2 and flow to the scanning and packaging area;

[0066] 2. If it is NG, it will be handed over to the squad leader for handling;

[0067] Step 8: Scan and enter the packaging, and place the packaged product in the corresponding packaging area.

[0068] The above embodiments and illustrations do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A circuit board quality inspection process using a double-layer assembly line for quality inspection, the double-layer assembly line includes: A rack, a distribution line arranged on the top of the rack, a return line arranged on the rack and spaced below the distribution line, a distribution drive motor driving the distribution line, and a return drive motor driving the return line, wherein the transmission direction of the distribution line is opposite to that of the return line, the distribution line includes a microscopic inspection area, a process quality inspection area, a finished product sampling inspection area, a counting and periodic area, and a scanning and recording packaging area, and the return line is correspondingly located below the microscopic inspection area, the process quality inspection area, and the finished product sampling inspection area; The distribution line includes a first conveyor belt, a conveyor roller and a second conveyor belt, the first conveyor belt is arranged in the mirror inspection area and the process inspection area, the conveyor roller is arranged in the finished product sampling area and is located between the first conveyor belt and the second conveyor belt, and the second conveyor belt is arranged in the counting period area and the scanning and recording packaging area; the distribution drive motor includes a first motor and a second motor, the first motor is arranged at the line head side of the distribution line and is located below the return line, the second motor is arranged at the line tail side of the distribution line, the first motor is connected to the first conveyor belt through the first conveyor chain, the second motor is connected to the second conveyor belt through the second conveyor chain, the conveyor roller is an unpowered roller, and the return drive motor is connected to the return line through the return conveyor chain; The circuit board quality inspection process includes the following steps: Step 1: The delivery staff arranges the products to be inspected according to the plan and sets the placement requirements for the products to be inspected and the products that have been inspected; Step 2: Determine whether the product needs microscopic inspection / special inspection based on the process sheet or customer requirements, including: a. If microscopic inspection / special inspection is required, the delivery staff will place the products to be inspected at the end of the distribution line according to the placement requirements. The inspectors in the microscopic inspection area and process product inspection area will take the materials from the distribution line for microscopic inspection and / or special inspection; b. After the microscopic inspection and / or special inspection is completed, the inspector places the product on the reflow line to the end of the line according to the placement requirements; c. The deliveryman receives the product. If the product is placed horizontally, he / she will determine whether it is a returned product after inspection by the finished product inspection personnel in the finished product sampling area that has not been accepted by the corresponding workstation or a product that has not been inspected by the finished product inspection personnel. If it is a returned product, it will be directly distributed to the corresponding workstation personnel. If it is an uninspected product, jump to step 3. d. If microscopic examination / special examination is not required, skip to step 3 directly; Step 3: The delivery person places the product on the distribution line according to the placement requirements and reminds the inspector at the corresponding station to collect the material; Step 4: Finished product inspectors and process product inspectors only take the uninspected products placed on the distribution line according to the placement requirements; Step 5: After the finished product inspectors and process inspectors have completed their work, they place the inspected products on the distribution line and flow them to the finished product sampling area according to the placement requirements; Step 6: The finished product inspector will conduct random inspection, including: a. If the random inspection is OK, place the product on the second conveyor belt of the distribution line and flow it to the counting and periodic area; b. If it is NG, the finished product factory inspector reminds the corresponding inspection station and places the returned products horizontally on the reflow line, and flows the returned products to the corresponding inspection station; c. If the remaining products are uninspected products placed according to the placement requirements, the products will be removed from the distribution line and placed on the return line according to the placement requirements to continue to return. They will be picked up by the finished product inspector or the process inspector during the process or flow to the end of the return line and then fed by the delivery staff; Step 7: Points are divided into periods, including: a. If OK, place the product on the second conveyor belt of the distribution line and flow to the scanning and packaging area; b. If NG, it will be transferred to the designated personnel for processing; Step 8: Scan and enter the packaging, and place the packaged product in the corresponding packaging area.

2. A circuit board quality inspection process using a double-layer assembly line for quality inspection as claimed in claim 1, characterized in that: The first motor, the second motor and the reflux drive motor are respectively connected to a frequency converter.

3. The circuit board quality inspection process using a double-layer assembly line for quality inspection as claimed in claim 1, characterized in that: The frame is provided with a motor installation cabinet at the bottom of the line head and the line tail of the distribution line respectively. The first motor and the reflux drive motor are arranged in the motor installation cabinet at the line head of the distribution line, and the second motor is arranged in the motor installation cabinet at the line tail of the distribution line.

4. The circuit board quality inspection process using a double-layer assembly line for quality inspection as claimed in claim 1, characterized in that: A block is set between the finished product sampling area and the counting and periodic area of ​​the distribution line, a block is set between the counting and periodic area and the scanning and input packaging area, a block is set at the end of the second conveyor belt, and a block is also set at the end of the return line.

5. The circuit board quality inspection process using a double-layer assembly line for quality inspection as claimed in claim 1, characterized in that: The first conveyor belt and the second conveyor belt of the distribution line and both sides of the return line are equipped with retaining edges.

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