An assembly workbench for improving flatness of printed boards and an assembly method

Abstract

The application discloses a kind of lifting printed board flatness assembly workstation and assembly method, including pressing device, guiding and supporting device and locking device.The guiding and supporting device is used to support the parts required for printed board flatness assembly;The pressing device is installed on the guiding and supporting device, to generate pressing force to printed board to complete printed board assembly;The locking device is used to realize the quick installation and disassembly of pressing device.The assembly workstation and assembly method of the application can solve the problem of poor assembly flatness caused by warping and thickness deviation during printed board processing, and the product consistency is poor compared to traditional assembly method.This method can effectively ensure that the printed board is flush with the end face of the shell after assembly, and the structure is simple and easy to operate.

Description

Technical Field

[0001] This invention belongs to the field of printed circuit board assembly technology, and particularly relates to the assembly of printed circuit boards in the mass production process of inductive encoders, especially an assembly workbench and assembly method for improving the flatness of printed circuit boards. Background Technology

[0002] Printed circuit board (PCB) assembly is a critical process in electronics manufacturing. It not only concerns the fixation of components but also affects the reliability, heat dissipation performance, and lifespan of products. Furthermore, warping during PCB processing and deviations in PCB thickness after processing lead to poor consistency in PCB assembly production.

[0003] Traditional screw fixing methods are costly to assemble, and the screws themselves increase weight and the number of parts; clip / clamping groove fixing methods require high structural design precision, are prone to fatigue and have poor vibration resistance after long-term use; potting / in-mold injection fixing methods are basically unrepairable, have complex processes, high costs, and increase product weight; while adhesive fixing methods have the advantages of taking up almost no space, having a high level of protection, and being suitable for irregular surfaces, but the overall flatness of existing printed circuit boards after adhesive fixing is poor, which has been verified to affect the absolute accuracy of the product. How to improve the assembly flatness of printed circuit boards is a problem that urgently needs to be solved in current production processes. Summary of the Invention

[0004] The purpose of this invention is to provide an assembly workbench and assembly method for improving the flatness of printed circuit boards, so as to solve the defects of existing technologies for PCB assembly, such as high cost, poor precision and complex process.

[0005] The technical solution to achieve the purpose of this invention is as follows: On the one hand, an assembly workbench for improving the flatness of printed circuit boards is provided, the workbench including a pressing device, a guiding and supporting device and a locking device;

[0006] The guiding and supporting device is used to support the components required for the flatness assembly of the printed circuit board;

[0007] The pressing device is installed on the guide and support device and is used to apply downward pressure to the printed circuit board to complete the assembly of the printed circuit board.

[0008] The locking device is used to enable the quick installation and removal of the pressing device.

[0009] Furthermore, the guiding and supporting device includes a base plate and several guide columns mounted on the base plate; the pressing device is movably connected to the base plate through the guide columns and is locked or unlocked by a locking device; the printed circuit board and the housing to be assembled are placed in the center of the base plate and directly below the pressing device; the printed circuit board is placed in the housing, and epoxy resin is applied to the inside of the housing.

[0010] Furthermore, the pressing device includes a top plate and a pressure plate arranged coaxially from top to bottom, and the two are elastically connected by a number of guide rods; the top plate is movably connected to the bottom plate through the guide column; the height of the guide rod is adjustable, and by adjusting the height of the guide rod, the pressure plate is made to contact the surface of the printed circuit board and continuously generate a downward force, so that the printed circuit board and the housing will not have relative displacement.

[0011] Furthermore, the top plate and the pressure plate are provided with multiple sets of one-to-one corresponding through holes for installing the guide rods. The installation position of the guide rods can be adjusted according to the size of the printed circuit board. The through holes have a heat conduction function to ensure that the printed circuit board is heated evenly during the fixing process.

[0012] Furthermore, the pressure plate contacts the printed circuit board via an annular pressure block.

[0013] Furthermore, a spring is provided inside the guide rod to achieve the elastic connection.

[0014] Furthermore, the locking device includes several sets of locking posts and locking buckles. One end of the locking post is fixedly installed on the base plate, and the other end passes through the first through hole on the top plate and is locked or unlocked by the locking buckle.

[0015] Furthermore, the locking buckle includes a locking block and a manual pull block. The locking block is fixedly installed on the top plate, and the manual pull block is slidably installed in the locking block. The manual pull block includes a pulling end and a fixed end. One end of the fixed end is inserted into the cavity of the locking block and can slide along the cavity, and is connected to the bottom of the cavity by a spring. The other end of the fixed end is fixedly connected to the pulling end. The locking block is provided with a second through hole through which the locking column can pass, and the fixed end is also provided with a third through hole through which the locking column can pass. The second through hole and the first through hole are aligned. In the first state, the locking column passes through the three through holes. At the same time, under the action of the spring, the third through hole is misaligned with the first and second through holes, thereby locking the locking column and enabling the quick installation of the pressing device. In the second state, the locking column is disengaged from the third through hole, and the third through hole is misaligned with the first and second through holes, thereby unlocking the locking column and enabling the quick disassembly of the pressing device.

[0016] Furthermore, the locking block is provided with a U-shaped hole, and the manual pull block is provided with a pin, which is engaged in the U-shaped hole and can slide along the U-shaped hole.

[0017] On the other hand, a printed circuit board assembly method based on the worktable is provided, the method comprising the following steps:

[0018] Step 1: After cleaning the housing, place it in the center of the base plate and apply epoxy resin around the circumference of the boss inside the housing cavity used to place the printed circuit board.

[0019] Step 2: Apply UV film to the back of the printed circuit board;

[0020] Step 3: Place the entire printed circuit board upside down onto the ring-shaped pressure block;

[0021] Step 4: Place the annular pressure block together with the printed circuit board at the center position above the housing, and make sure that the limiting groove of the printed circuit board is aligned with the limiting boss inside the housing.

[0022] Step 5: Place the workbench built in steps 1 to 4 onto the press. Apply downward pressure to press the printed circuit board into the housing. Stop pressing down after the printed circuit board is completely pressed into the housing.

[0023] Step 6: Remove the current worktable from the press, install the pressing device on the base plate and lock it with the locking device. Adjust the height of the guide rod in the pressing device so that the pressing device is in close contact with the annular pressure block and generates force to form the whole machine assembly worktable.

[0024] Step 7: Place the assembly workbench into an oven for epoxy adhesive curing. After curing, remove the pressing device, remove the ring-shaped pressure block, and remove the UV film adhered to the printed circuit board to complete the assembly of the printed circuit board.

[0025] Compared with the prior art, the significant advantages of this invention are:

[0026] (1) The assembly workbench and assembly method of the present invention can effectively solve the problem of poor assembly flatness caused by warping during the printing board processing.

[0027] (2) Due to the thickness tolerance during the processing of printed circuit boards, the product consistency is poor compared with the traditional assembly method. This method can effectively ensure that the printed circuit board is flush with the end face of the shell after assembly.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0029] Figure 1 This is an isometric view of an assembly table for improving the flatness of printed circuit boards in one embodiment.

[0030] Figure 2 This is a view of a press machine pressing down on an assembly table to improve the flatness of printed circuit boards in one embodiment.

[0031] Figure 3 This is a left view of an assembly table for improving the flatness of printed circuit boards in one embodiment.

[0032] Figure 4 This is a top view of an assembly workbench for improving the flatness of printed circuit boards in one embodiment.

[0033] In the diagram, 1—shell, 2—printed circuit board, 3—annular pressure block, 4—pressure plate, 5—guide rod, 6—top plate, 7—locking device, 8—manual pull block, 9—first countersunk screw, 10—locking column, 11—guide column, 12—bottom plate, 13—second countersunk screw, 14—first spring, 15—UV film, 16—press, 17—U-shaped hole, 18—locking block, 19—second spring, 20—through hole. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0035] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0037] In one embodiment, combined Figures 1 to 4 A worktable for improving the flatness of printed circuit boards is provided. The worktable includes a pressing device, a guiding and supporting device, and a locking device.

[0038] The guiding and supporting device is used to support the components required for the flatness assembly of the printed circuit board;

[0039] The pressing device is installed on the guide and support device and is used to apply downward pressure to the printed circuit board to complete the assembly of the printed circuit board.

[0040] The locking device is used to enable the quick installation and removal of the pressing device.

[0041] Furthermore, in one embodiment, the guiding and supporting device includes a base plate 12 and a plurality of guide columns 11 mounted on the base plate 12; the pressing device is movably connected to the base plate 12 through the guide columns 11 and is locked or unlocked by the locking device 7; the printed circuit board 2 to be assembled and the housing 1 are placed on the base plate 12 and located directly below the pressing device; the printed circuit board 2 is placed in the housing 1, and epoxy resin is applied to the inside of the housing 1.

[0042] Preferably, the guide column 11 is fixed to the base plate 12 by, but not limited to, a second countersunk screw 13.

[0043] Furthermore, in one embodiment, the pressing device includes a top plate 6 and a pressure plate 4 arranged coaxially from top to bottom, and the two are elastically connected by a plurality of guide rods 5; the top plate 6 is movably connected to the bottom plate 12 through the guide column 11; the height of the guide rods 5 is adjustable, and by adjusting the height of the guide rods 5, the pressure plate 4 is made to contact the surface of the printed circuit board 2 and generate a downward force, so that the printed circuit board 2 and the housing 1 will not have relative displacement.

[0044] Here, the thickness of the housing 1 varies, and this can be adapted by adjusting the height of the guide rod 5.

[0045] Preferably, in some embodiments, the top plate 6 and the pressure plate 4 are provided with multiple sets of one-to-one corresponding through holes 20 for installing the guide rod 5. The installation position of the guide rod 5 can be adjusted according to the size of the printed circuit board 2. The through holes 20 have a heat conduction function to ensure that the printed circuit board 2 is heated evenly during the fixing process.

[0046] Here, the pressure plate is typically made of metal or similar material. To prevent damage to the printed circuit board (PCB), the pressure plate 4 contacts the PCB 2 via an annular pressure block 3. Here, the annular pressure block 3 is made of plastic or similar material, which effectively prevents damage to the PCB.

[0047] Preferably, in some embodiments, the guide rod 5 is provided with, but is not limited to, a spring, to achieve the elastic connection.

[0048] Here, by way of example, the guide rod 5 includes a first guide rod and a second guide rod. The first guide rod is fixedly mounted on the top plate 6, and the second guide rod is fixedly mounted on the pressure plate 4. The first guide rod and the second guide rod are connected by, but not limited to, a first spring 14. The first spring 14 is in a compressed state throughout the curing process of the printed circuit board 2.

[0049] Here, by further example, the upper end of the second guide rod has an opening to form a cavity, in which a first spring 14 is contained, and the first guide rod is inserted into the cavity and connected to the first spring 14.

[0050] Furthermore, in one embodiment, the locking device 7 includes several sets of locking posts 10 and locking buckles. One end of the locking post 10 is fixedly installed on the base plate 12, and the other end passes through the first through hole on the top plate 6 and is locked or unlocked by the locking buckle.

[0051] Preferably, in some embodiments, the locking buckle includes a locking block 18 and a manual pull block 8. The locking block 18 is fixedly installed on the top plate 6, and the manual pull block 8 is slidably installed in the locking block 18. The manual pull block 8 includes a pulling end and a fixed end. One end of the fixed end is inserted into the cavity of the locking block 18 and can slide along the cavity, and is connected to the bottom of the cavity by a second spring 19, which is always in a stretched state. The other end of the fixed end is fixedly connected to the pulling end. The locking block 18 is provided with a locking post 10 that can pass through it. The second through hole and the fixed end are also provided with a third through hole through which the locking column 10 can pass, and the second through hole and the first through hole are aligned; in the first state, the third through hole is aligned with the first through hole and the second through hole, the locking column 10 passes through the three through holes, and under the action of the second spring 19, the locking column 10 is locked, thereby realizing the quick installation of the pressing device; in the second state, the third through hole is misaligned with the first through hole and the second through hole, the locking column 10 is disengaged from the third through hole, thereby realizing the unlocking of the locking column 10, thereby realizing the quick disassembly of the pressing device.

[0052] Here, by pulling the pulling end, the fixed end slides within the locking block 18, aligning the third through hole with the first and second through holes. Then, the locking column 10 passes through the three through holes. Releasing the pulling end allows the locking column 10 to be locked under the force of the second spring 19. Here, the third through hole limits the locking column 10, achieving locking, while the second spring 19 exerts a pulling force on the manual pull block 8, creating a compressive force between the locking column 10 and the third through hole, further tightening the lock.

[0053] Based on the locking, by pulling the pulling end, the fixed end is slid in the locking block 18, so that the third through hole is aligned with the first through hole and the second through hole, and the locking column 10 is disengaged from the third through hole, thereby unlocking the locking column 10. Then, the pulling end is released, and under the force of the second spring 19, the third through hole is misaligned with the first through hole and the second through hole.

[0054] Preferably, the locking block 18 is fixedly mounted on the top plate 6 by, but not limited to, a first countersunk screw 9.

[0055] Preferably, the locking block 18 is provided with a U-shaped hole 17, and the pin provided on the manual pull block 8 is engaged in the U-shaped hole 17 and can slide along the U-shaped hole 17.

[0056] In one embodiment, a printed circuit board assembly method based on the workbench is provided, the method comprising the following steps:

[0057] Step 1: After cleaning the housing 1, place it at the center of the base plate 12, and apply epoxy resin around the circumference of the boss inside the cavity of the housing 1 used to place the printed circuit board 2.

[0058] Preferably, the amount of adhesive is about 1 / 2 of the step height.

[0059] Step 2, attach, but not limited to, UV film 15, to the back of printed circuit board 2;

[0060] Step 3: Place the entire printed circuit board 2 upside down onto the annular pressure block 3;

[0061] Specifically, peel off the adhesive on one side of the UV film 15 and stick it to the back of the printed circuit board 2, making sure the adhesive is as flat as possible and there are no air bubbles with a diameter greater than 2mm; then peel off the adhesive on the other side of the UV film 15 and flip the entire printed circuit board 2 upside down onto the annular pressure block 3.

[0062] Step 4: Place the annular pressure block 3 together with the printed circuit board 2 at the center position above the housing 1, and make sure that the limiting groove of the printed circuit board 2 is aligned with the limiting protrusion inside the housing 1.

[0063] Step 5: Place the workbench built in steps 1 to 4 on the press 16. The press 16 applies downward pressure to press the printed circuit board 2 into the housing 1. After the printed circuit board 2 is completely pressed into the housing 1, the press 16 stops pressing.

[0064] Step 6: Remove the worktable from the press 16, install the pressing device, and lock it with the locking device 7. Adjust the height of the guide rod 5 in the pressing device so that the pressing device is in close contact with the annular pressure block 3 and generates force to form the assembly worktable of the whole machine.

[0065] Step 7: Place the assembly workbench into the oven to cure the epoxy adhesive. After curing, remove the pressing device, remove the ring pressure block 3, and remove the UV film 15 adhered to the printed circuit board 2. This completes the assembly of the printed circuit board 2.

[0066] This completes one assembly process for the printed circuit board.

[0067] It should be noted that for components without special structural limitations, any component that can achieve the corresponding function in the existing technology is acceptable.

[0068] It should also be noted that the above-mentioned settings, installations, connections, and fixations can be made using, but are not limited to, bolts, threads, etc. Any existing fixed or movable connection scheme can be adapted, as long as the corresponding function can be achieved.

[0069] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention without departing from its spirit and scope should be included within the protection scope of the present invention.

Claims

1. A printed circuit board assembly method based on an assembly workbench, characterized in that, The assembly workbench includes a pressing device, a guiding and supporting device, and a locking device; The guiding and supporting device is used to support the components required for the flatness assembly of the printed circuit board; The pressing device is installed on the guide and support device and is used to apply downward pressure to the printed circuit board to complete the assembly of the printed circuit board. The locking device is used to enable the quick installation and removal of the pressing device; The guiding and supporting device includes a base plate (12) and several guide columns (11) installed on the base plate (12); the pressing device is movably connected to the base plate (12) through the guide columns (11) and is locked or unlocked by the locking device (7); the printed circuit board (2) to be assembled and the housing (1) are placed in the center of the base plate (12) and located directly below the pressing device; the printed circuit board (2) is placed in the housing (1) and epoxy glue is applied to the inside of the housing (1); The pressing device includes a top plate (6) and a pressure plate (4) arranged coaxially from top to bottom, and the two are elastically connected by a number of guide rods (5); the top plate (6) is movably connected to the bottom plate (12) through the guide column (11); the height of the guide rod (5) is adjustable, and by adjusting the height of the guide rod (5) the pressure plate (4) is made to contact the surface of the printed circuit board (2) and continuously generate a downward force so that the printed circuit board (2) and the housing (1) will not have relative displacement; The method includes the following steps: Step 1: After cleaning the housing (1), place it in the center of the base plate (12) and apply epoxy resin around the circumference of the boss inside the cavity of the housing (1) used to place the printed circuit board (2). Step 2, attach UV film (15) to the back of the printed circuit board (2); Step 3: Place the entire printed circuit board (2) upside down onto the annular pressure block (3); Step 4: Place the annular pressure block (3) together with the printed circuit board (2) at the center position above the housing (1), and make sure that the limiting groove of the printed circuit board (2) is aligned with the limiting boss inside the housing (1); Step 5: Place the workbench built in steps 1 to 4 on the press (16), and press (16) applies downward pressure to press the printed circuit board (2) into the housing (1). After the printed circuit board (2) is completely pressed into the housing (1), press (16) stops pressing. Step 6: Remove the current workbench from the press (16), install the pressing device on the base plate and lock it with the locking device (7), adjust the height of the guide rod (5) in the pressing device so that the pressing device is in close contact with the annular pressure block (3) and generates force to form the whole machine assembly workbench; Step 7: Place the assembly workbench into the oven for epoxy curing. After curing, remove the pressing device, remove the ring pressure block (3), and remove the UV film (15) bonded to the printed circuit board (2), thus completing the assembly of the printed circuit board (2).

2. The printed circuit board assembly method based on an assembly workbench according to claim 1, characterized in that, The top plate (6) and the pressure plate (4) are provided with multiple sets of one-to-one corresponding through holes (20) for installing the guide rod (5). The installation position of the guide rod (5) can be adjusted according to the size of the printed circuit board (2). The through holes (20) have a heat conduction function to ensure that the printed circuit board (2) is heated evenly during the fixing process.

3. The printed circuit board assembly method based on an assembly workbench according to claim 1, characterized in that, The pressure plate (4) contacts the printed circuit board (2) through the annular pressure block (3).

4. The printed circuit board assembly method based on an assembly workbench according to claim 1, characterized in that, The guide rod (5) is equipped with a spring inside to achieve the elastic connection.

5. The printed circuit board assembly method based on an assembly workbench according to claim 1, characterized in that, The locking device (7) includes several sets of locking columns (10) and locking buckles. One end of the locking column (10) is fixedly installed on the base plate (12), and the other end passes through the first through hole on the top plate (6) and is locked or unlocked by the locking buckle.

6. The printed circuit board assembly method based on an assembly workbench according to claim 5, characterized in that, The locking buckle includes a locking block (18) and a manual pull block (8). The locking block (18) is fixedly installed on the top plate (6). The manual pull block (8) is slidably installed in the locking block (18). The manual pull block (8) includes a pulling end and a fixed end. One end of the fixed end is inserted into the cavity of the locking block (18) and can slide along the cavity, and is connected to the bottom of the cavity by a spring. The other end of the fixed end is fixedly connected to the pulling end. The locking block (18) is provided with a second through hole through which the locking post (10) can pass. The fixed end is also provided with... There is a third through hole through which the locking column (10) can pass, and the second through hole and the first through hole are aligned. In the first state, the locking column (10) passes through the three through holes. At the same time, under the action of the spring, the third through hole and the first and second through holes are misaligned to lock the locking column (10) and thus realize the quick installation of the pressing device. In the second state, the locking column (10) is disengaged from the third through hole, and the third through hole and the first and second through holes are misaligned to unlock the locking column (10) and thus realize the quick disassembly of the pressing device.

7. The printed circuit board assembly method based on an assembly workbench according to claim 6, characterized in that, The locking block (18) is provided with a U-shaped hole (17), and the manual pull block (8) is provided with a pin. The pin is locked in the U-shaped hole (17) and can slide along the U-shaped hole (17).

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