Electronic scale base PCB board assembly device and method

Abstract

The present invention belongs to the technical field of electronic scale production equipment, and in particular, relates to an electronic scale base PCB board assembly device and method thereof, comprising an assembly mechanical arm, a workbench, a screw feeding vibration disk, and an industrial computer for controlling the assembly mechanical arm, wherein the discharge end of the screw feeding vibration disk is fixedly connected with an arc-shaped material guide plate, and the outer walls of the four support legs of the workbench are fixedly connected with a support plate, and the upper surface of the support plate is fixedly connected with the bottom end of the screw feeding vibration disk. The present invention enables the electronic scale base PCB board assembly device to not only have the function of preventing the PCB board fixing screws from being over-tightened, but also has the function of timely cleaning the friction debris of the PCB board assembly screws and sealing the exposed part of the screw top to prevent rust, which can effectively avoid the occurrence of PCB board damage, screw thread slippage, and slight deformation of the electronic scale base, thereby improving the qualified rate of PCB board assembly, ensuring the effect of the use of the electronic scale, and improving the reliability of the use of the electronic scale.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic scale production equipment, and in particular relates to an electronic scale base PCB board assembly device and a method thereof. Background Art

[0002] An electronic scale is a device used to measure the mass of an object. It can convert the weight of an object into an electrical signal and display the weight value. At the same time, the PCB board plays a key role in the electronic scale. First, the PCB board realizes circuit connection and integration, connecting sensors, chips and other components into a complete circuit system. Secondly, the PCB board is responsible for signal transmission and processing to ensure accurate and stable measurement. Moreover, the PCB board carries the control chip and related circuits to realize control and calculation functions such as calibration, unit conversion, and peeling. Therefore, during the production process of the electronic scale, the PCB board needs to be assembled into the electronic scale base by screws. For example, the patent authorization announcement number is CN113825387B, which discloses an electronic scale base PCB board assembly device and its processing line.

[0003] At present, during the assembly process of the PCB board of the electronic scale base, the screws used to fix the PCB board assembly are easily over-tightened by the assembly equipment. Over-tightening of the screws not only easily causes damage to the circuits, components or solder joints on the PCB board, thereby affecting the normal function of the electronic scale, but also easily causes the screws to slip and the electronic scale base to deform slightly. The slipped screws are likely to affect the stability of the PCB board assembly, and the slight deformation of the electronic scale base is likely to affect the structural stability and measurement accuracy of the electronic scale.

[0004] In addition, as the electronic scale is used for a longer time, the exposed surface of the screws used to fix the PCB board is easily corroded by moisture in the air, and the metal oxides produced by the rust are easy to fall off the screws. Then, when these shed metal oxides are affected by the moisture in the air and become wet, they are not only easy to adhere to the surface of the PCB board, but also have strong conductivity, which can easily cause disconnected circuits on the PCB board to become connected, resulting in malfunction of the PCB board, further affecting the reliability of the electronic scale.

[0005] To this end, we propose an electronic scale base PCB board assembly device and method to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide an electronic scale base PCB board assembly device and method in view of the above problems.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: an electronic scale base PCB board assembly device, comprising an assembly robot arm, a workbench, a screw feeding vibration plate and an industrial computer for controlling the assembly robot arm, the discharge end of the screw feeding vibration plate is fixedly connected with an arc-shaped material guide plate, the outer walls of the four support legs of the workbench are fixedly connected with a support plate, the upper surface of the support plate is fixedly connected to the bottom end of the screw feeding vibration plate, the upper surface of the workbench is fixedly connected with a belt conveyor and a support frame, the top end of the support frame is fixedly connected to the bottom end of the assembly robot arm, the inner wall of the support frame is fixedly connected to the outer wall of the industrial computer, and the assembly robot arm is fixedly connected to the outer wall of the industrial computer. The assembly end is fixedly connected with a hollow frame, the inner wall of the hollow frame is fixedly connected with a motor, the output end of the motor passes through the lower surface of the hollow frame and is fixedly connected with a hollow cylinder, the bottom end of the hollow cylinder is fixedly sleeved with an assembly bit, the outer wall of the assembly bit is fixedly sleeved with a limit ring and an external threaded ring, the outer wall of the external threaded ring is threadedly connected with an adjusting threaded ring, the lower surface of the adjusting threaded ring is fixedly connected with two connecting rods, the bottom ends of the two connecting rods are commonly fixedly connected with a mounting ring, the lower surface of the mounting ring is provided with a through hole, and the hole wall of the through hole is fixedly embedded with a pressure sensor, and the outer wall of the bottom end of the assembly bit is movably sleeved with a screw over-tightening detection mechanism;

[0008] The inner wall of the hollow cylinder is fixedly connected with an auxiliary mechanism for assembling a screw bit and obtaining screws, and the side wall of the hollow frame is fixedly connected with a cleaning mechanism;

[0009] A sealing mechanism is fixedly connected to the lower surface of the hollow frame for preventing the top of the screw from rusting after assembly.

[0010] In the above-mentioned electronic scale base PCB board assembly device, the screw over-tightening detection mechanism includes a rolling bearing, a movable ring and a reset spring that are movably sleeved with the outer wall of the bottom end of the assembly bit, and the two ends of the reset spring are respectively fixedly connected to the lower surface of the movable ring and the upper surface of the rolling bearing, and the outer wall of the outer ring of the rolling bearing is fixedly sleeved with an outer cover.

[0011] In the above-mentioned electronic scale base PCB board assembly device, the outer wall of the external threaded ring is fixedly connected to two symmetrically distributed nuts, the inner wall of the nut is threadedly connected to a limiting bolt, and the top of the limiting bolt is in active contact with the lower surface of the hollow cylinder.

[0012] In the above-mentioned electronic scale base PCB board assembly device, the auxiliary mechanism includes an electromagnet fixedly connected to the inner wall of the hollow cylinder, the bottom end of the electromagnet contacts the top of the assembly bit, the top outer wall of the hollow cylinder is fixedly sleeved with an annular conductive slip ring, the outer wall of the rotating part of the annular conductive slip ring is fixedly sleeved with a positioning ring, the top of the positioning ring is fixedly connected to the lower surface of the hollow frame, the fixed part wire of the annular conductive slip ring passes through the inner wall of the hollow cylinder and is electrically connected to the connecting end of the electromagnet, the inside of the hollow frame is fixedly connected with a plc controller, and the upper wire of the rotating part of the annular conductive slip ring is electrically connected to the output end of the plc controller.

[0013] In the above-mentioned electronic scale base PCB board assembly device, the cleaning mechanism includes a rectangular box fixedly connected to the outer wall of the hollow frame, the side wall of the rectangular box is provided with a rectangular mounting hole, and the hole wall of the rectangular mounting hole is fixedly connected to a filter screen plate, the lower surface of the filter screen plate is fixedly connected to a sponge filter block, the outer side wall of the filter screen plate is fixedly connected to a sealing plate, the outer wall of the sealing plate is fixedly connected to the outer wall of the rectangular box by a fixing bolt, the inner wall of the rectangular box is fixedly connected to a U-shaped sealing baffle frame matching the side wall of the filter screen plate, the bottom end of the rectangular box is fixedly sleeved with an air guide pipe, the bottom end of the air guide pipe is fixedly connected to the outer wall of the outer cover, the top end of the rectangular box is fixedly connected to a one-way air pump, the air inlet end of the one-way air pump is fixedly connected to the upper surface of the rectangular box through a bent pipe, and the air outlet end of the one-way air pump is fixedly connected to an air supply pipe.

[0014] In the above-mentioned electronic scale base PCB board assembly device, the sealing mechanism includes a fixed plate fixedly connected to the lower surface of the hollow frame, the outer wall of the fixed plate is fixedly connected to a UV glue box, the bottom end of the UV glue box is fixedly connected to a glue supply hose, the bottom end of the glue supply hose is fixedly connected to a glue spray head, the side wall of the glue spray head is fixedly connected to an L-shaped plate, the upper surface of the L-shaped plate is fixedly connected to the bottom end of the fixed plate, the lower surface of the L-shaped plate is provided with an inclined hole, and the hole wall of the inclined hole is fixedly connected to an ultraviolet curing lamp, the top end of the UV glue box is fixedly connected to an activated carbon filter tank, the top end of the activated carbon filter tank is fixedly connected to the air outlet end of the air supply pipe, the outer wall of the air outlet end of the air supply pipe is fixedly connected to a pressure valve, and the bottom end of the activated carbon filter tank is fixedly connected to a quantitative component.

[0015] In the above-mentioned electronic scale base PCB board assembly device, the quantitative component includes a quantitative hollow block fixedly sleeved with the air outlet end of the activated carbon filter tank, and the side wall of the quantitative hollow block is fixedly connected to the electromagnetic valve.

[0016] An assembly method of a PCB assembly device for an electronic scale base, further comprising the following steps:

[0017] Step S1: First, put the screw into the screw feeding vibration plate, then the PLC controller energizes the electromagnet through the annular conductive slip ring to generate magnetic attraction, and then the assembly screwdriver generates magnetic attraction, and then the industrial computer controls the assembly robot arm to move the assembly screwdriver to the arc-shaped guide plate, and the assembly screwdriver with magnetic attraction absorbs the screw, and then the industrial computer controls the assembly robot arm to drive the assembly screwdriver that absorbs the screw to the PCB board assembly station to assemble the PCB board;

[0018] Step S2: The industrial computer moves the screw to the fixing hole of the PCB board by assembling the mechanical arm, the hollow frame, the hollow cylinder and the assembly bit, and then the PLC controller controls the motor to start, and the motor drives the assembly bit to rotate through the hollow cylinder. The rotating assembly bit can screw the screw into the threaded fixing hole of the electronic scale base to complete the PCB board fixing operation;

[0019] Step S3: At the end of step 2, as the screw penetrates into the internal threaded fixing hole of the electronic scale base, the outer cover is squeezed by the PCB board gradually. After the pressure of the pressure sensor in the screw over-tightening detection mechanism reaches the preset pressure alarm threshold, the pressure sensor sends an electrical signal of screw tightening to the PLC controller. The PLC controller controls the motor and the one-way vacuum pump to stop rotating according to the electrical signal. At this time, the assembly bit no longer drives the screw to be over-tightened.

[0020] Step S4: while the screw is fixed by the assembly bit, the PLC controller also controls the one-way vacuum pump to work, and the cleaning mechanism cleans the micro metal debris generated by the rotation friction of the screw to prevent these tiny metal debris from adhering to the surface of the PCB board and causing the circuit on the surface of the PCB board to be disconnected;

[0021] Step S5: After the screws used for PCB board assembly are screwed into the base of the electronic scale, the industrial computer drives the assembly bit away from the PCB board through the assembly robot arm. At the same time, the assembly robot arm moves the glue spray head to the top of the tightened screw. Then the sealing mechanism sprays UV glue to the exposed part of the top of the screw. After the UV glue is cured, it can prevent the exposed part of the top of the screw from being corroded by moisture in the air.

[0022] Compared with the existing technology, the advantages of an electronic scale base PCB board assembly device and method thereof are:

[0023] 1. Through the set assembly robot arm, screw feeding vibration plate, screw over-tightening detection mechanism and auxiliary mechanism, when the PCB board is assembled to the electronic scale base through screws, the PLC controller energizes the electromagnet through the annular conductive slip ring to generate magnetic attraction, which in turn causes the assembly bit to generate magnetic attraction. Then the industrial computer controls the assembly robot arm to move the assembly bit to the arc-shaped guide plate. The assembly bit with magnetic attraction absorbs the screw. After that, the industrial computer controls the assembly robot arm to drive the assembly bit that absorbs the screw to the PCB board assembly station for PCB board assembly. As the screw penetrates into the internal threaded fixing hole of the electronic scale base, the outer cover is affected by the PC When the extrusion of plate B increases gradually and the pressure on the pressure sensor in the screw over-tightening detection mechanism reaches the preset pressure alarm threshold, the pressure sensor promptly sends an electrical signal of screw tightening to the PLC controller, and the PLC controller promptly controls the motor and the one-way air pump to stop rotating according to the electrical signal. At this time, the assembly bit no longer drives the screw to be over-tightened. This mechanism enables the PCB board assembly device of the electronic scale base to have the function of preventing the PCB board fixing screws from being over-tightened, thereby avoiding damage to the PCB board, screw stripping and slight deformation of the electronic scale base, thereby improving the qualified rate of PCB board assembly and ensuring the effect of the use of the electronic scale.

[0024] 2. Through the cleaning mechanism, while the screws are fixed by the assembly bit, the PLC controller also controls the one-way air pump to work. The cleaning mechanism can timely clean the micro metal debris generated by the rotation friction of the screws to avoid these tiny metal debris adhering to the surface of the PCB board, causing the circuit on the surface of the PCB board to be disconnected, thereby ensuring that the PCB board can be used normally and reliably. This mechanism enables the PCB board assembly device of the electronic scale base to have the function of timely cleaning the friction debris of the PCB board assembly screws, and can ensure that the PCB board can be used normally and reliably.

[0025] 3. Through the provided sealing mechanism, when the screws for PCB board assembly are screwed into the electronic scale base, the industrial computer drives the assembly bit away from the PCB board through the assembly robot arm, and at the same time, the assembly robot arm moves the glue spray head to the top of the tightened screw, and then the PLC controller controls the sealing mechanism to spray UV glue to the exposed part of the top of the screw. The UV glue curing can seal the exposed part of the top of the screw to prevent the exposed part of the screw from being corroded by moisture in the air, and then avoid the generation of metal oxides that cause the circuit on the surface of the PCB board to be disconnected, thereby ensuring that the PCB board can work normally, and the contact between the UV glue and the surface of the PCB board can also improve the stability of screw tightening. This mechanism enables the PCB board assembly device of the electronic scale base to have the function of sealing and rust-proofing the exposed part of the top of the screw, which can not only ensure the normal function of the PCB board, but also improve the reliability of the use of the electronic scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1It is a structural schematic diagram of an electronic scale base PCB board assembly device and method provided by the present invention;

[0027] Figure 2 It is a partially enlarged structural schematic diagram of an electronic scale base PCB board assembly device and method provided by the present invention;

[0028] Figure 3 It is a structural schematic diagram of a screw over-tightening detection mechanism in an electronic scale base PCB board assembly device and method provided by the present invention;

[0029] Figure 4 It is a structural schematic diagram of an arc-shaped material guide plate in an electronic scale base PCB board assembly device and method provided by the present invention;

[0030] Figure 5 It is a structural schematic diagram of a quantitative component in an electronic scale base PCB board assembly device and method provided by the present invention;

[0031] Figure 6 The present invention provides a schematic structural diagram of a U-shaped sealing baffle frame part in an electronic scale base PCB board assembly device and method thereof.

[0032] In the figure: 1 assembly robot arm, 2 workbench, 3 screw feeding vibration plate, 4 industrial computer, 5 screw over-tightening detection mechanism, 51 rolling bearing, 52 moving ring, 53 reset spring, 54 outer cover, 6 auxiliary mechanism, 61 electromagnet, 62 annular conductive slip ring, 63 positioning ring, 64 PLC controller, 7 cleaning mechanism, 71 rectangular box, 72 filter screen plate, 73 sponge filter block, 74 sealing plate, 75 U-shaped sealing baffle frame, 76 air guide pipe, 77 one-way air pump, 78 air supply pipe, 8 sealing mechanism, 81 fixed plate , 82UV glue tank, 83 glue supply hose, 84 glue spray head, 85L-shaped plate, 86 UV curing lamp, 87 activated carbon filter tank, 88 pressure valve, 9 quantitative component, 91 quantitative hollow block, 92 solenoid valve, 10 arc guide plate, 11 support plate, 12 belt conveyor, 13 support frame, 14 hollow frame, 15 motor, 16 hollow cylinder, 17 assembly batch head, 18 limit ring, 19 external thread ring, 20 adjustment thread ring, 21 connecting rod, 22 mounting ring, 23 pressure sensor, 24 nut, 25 limit bolt. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1-Figure 6 As shown, an electronic scale base PCB board assembly device and method thereof include an assembly robot arm 1, a workbench 2, a screw feeding vibration disk 3 and an industrial computer 4 for controlling the assembly robot arm 1, the discharge end of the screw feeding vibration disk 3 is fixedly connected with an arc-shaped material guide plate 10, the outer walls of the four support legs of the workbench 2 are fixedly connected with a support plate 11, the upper surface of the support plate 11 is fixedly connected to the bottom end of the screw feeding vibration disk 3, the upper surface of the workbench 2 is fixedly connected with a belt conveyor 12 and a support frame 13, the top of the support frame 13 is fixedly connected to the bottom end of the assembly robot arm 1, the inner wall of the support frame 13 is fixedly connected to the outer wall of the industrial computer 4, the assembly end of the assembly robot arm 1 is fixedly connected with a hollow frame 14, the inner wall of the hollow frame 14 is fixedly connected with a motor 15, and the output end of the motor 15 passes through the lower surface of the hollow frame 14. The surface is fixedly connected with a hollow cylinder 16, the bottom end of the hollow cylinder 16 is fixedly sleeved with an assembly bit 17, the outer wall of the assembly bit 17 is fixedly sleeved with a limit ring 18 and an external threaded ring 19, the outer wall of the external threaded ring 19 is fixedly connected with two symmetrically distributed nuts 24, the inner wall of the nut 24 is threadedly connected with a limit bolt 25, the top of the limit bolt 25 is in active contact with the lower surface of the hollow cylinder 16, and the limit bolt 25 can ensure the stability of the position of the external threaded ring 19 after squeezing the hollow cylinder 16, the outer wall of the external threaded ring 19 is threadedly connected with an adjusting threaded ring 20, the lower surface of the adjusting threaded ring 20 is fixedly connected with two connecting rods 21, the bottom ends of the two connecting rods 21 are commonly fixedly connected with a mounting ring 22, the lower surface of the mounting ring 22 is provided with a through hole, and the hole wall of the through hole is fixedly embedded with a pressure sensor 23.

[0035] A screw over-tightening detection mechanism 5 is movably sleeved on the outer wall of the bottom end of the assembly bit 17. The screw over-tightening detection mechanism 5 includes a rolling bearing 51, a movable ring 52 and a reset spring 53 movably sleeved on the outer wall of the bottom end of the assembly bit 17. The two ends of the reset spring 53 are respectively fixedly connected to the lower surface of the movable ring 52 and the upper surface of the rolling bearing 51. The outer wall of the outer ring of the rolling bearing 51 is fixedly sleeved with an outer cover 54. This mechanism can prevent damage to the PCB board caused by over-tightening of the screws, and at the same time prevent screw stripping and slight deformation of the electronic scale base.

[0036] The inner wall of the hollow cylinder 16 is fixedly connected with an auxiliary mechanism 6 for assembling the screw bit 17, and the auxiliary mechanism 6 includes an electromagnet 61 fixedly connected to the inner wall of the hollow cylinder 16, and the bottom end of the electromagnet 61 contacts the top of the assembling screw bit 17, and the top outer wall of the hollow cylinder 16 is fixedly sleeved with an annular conductive slip ring 62, and the outer wall of the rotating part of the annular conductive slip ring 62 is fixedly sleeved with a positioning ring 63, and the top of the positioning ring 63 is fixedly connected to the lower surface of the hollow frame 14, and the fixed part wire of the annular conductive slip ring 62 passes through the inner wall of the hollow cylinder 16 and is electrically connected to the connecting end of the electromagnet 61, and the inside of the hollow frame 14 is fixedly connected with a plc controller 64, and the upper wire of the rotating part of the annular conductive slip ring 62 is electrically connected to the output end of the plc controller 64. This mechanism can facilitate the assembly of the screw bit 17 to absorb the screws for PCB board assembly, thereby improving the convenience of PCB board assembly.

[0037] The side wall of the hollow frame 14 is fixedly connected with a cleaning mechanism 7, which includes a rectangular box 71 fixedly connected to the outer wall of the hollow frame 14, a rectangular mounting hole is opened on the side wall of the rectangular box 71, and a filter plate 72 is fixedly connected to the hole wall of the rectangular mounting hole, a sponge filter block 73 is fixedly connected to the lower surface of the filter plate 72, a sealing plate 74 is fixedly connected to the outer wall of the filter plate 72, and the outer wall of the sealing plate 74 is fixedly connected to the outer wall of the rectangular box 71 by fixing bolts, and the inner wall of the rectangular box 71 is fixedly connected with a U-shaped screw matched with the side wall of the filter plate 72. The rectangular box 71 is provided with a sealing baffle frame 75, and an air guide tube 76 is fixedly sleeved at the bottom end of the rectangular box 71. The bottom end of the air guide tube 76 is fixedly connected to the outer wall of the outer cover 54. The top end of the rectangular box 71 is fixedly connected to a one-way air pump 77. The air inlet end of the one-way air pump 77 is fixedly connected to the upper surface of the rectangular box 71 through a bend pipe, and the air outlet end of the one-way air pump 77 is fixedly connected to an air delivery pipe 78. This mechanism can timely clean up the metal debris generated by the friction when the screw rotates, avoid the metal debris adhering to the surface of the PCB board causing the disconnected circuit to be connected, and improve the reliability of the use of the PCB board.

[0038] The lower surface of the hollow frame 14 is fixedly connected with a sealing mechanism 8 for preventing the top of the screw from rusting after assembly. The sealing mechanism 8 includes a fixing plate 81 fixedly connected to the lower surface of the hollow frame 14, and the outer wall of the fixing plate 81 is fixedly connected with a UV glue box 82. The bottom end of the UV glue box 82 is fixedly connected with a glue supply hose 83, and the bottom end of the glue supply hose 83 is fixedly connected with a glue spray head 84. The side wall of the glue spray head 84 is fixedly connected with an L-shaped plate 85. The upper surface of the L-shaped plate 85 is fixedly connected to the bottom end of the fixing plate 81, and an inclined hole is opened on the lower surface of the L-shaped plate 85. The hole wall of the inclined hole is fixedly connected with an ultraviolet curing lamp 86. The top of the UV glue box 82 is fixedly connected with an activated carbon filter tank 87. The top of the activated carbon filter tank 87 is fixedly connected to the outlet end of the gas supply pipe 78. The outer wall of the air end is fixedly connected to a pressure valve 88, and the bottom end of the activated carbon filter tank 87 is fixedly connected to a quantitative component 9. The quantitative component 9 includes a quantitative hollow block 91 fixedly connected to the air outlet end of the activated carbon filter tank 87, and the side wall of the quantitative hollow block 91 is fixedly connected to a solenoid valve 92. The quantitative component 9 can inject a standard amount of air into the UV glue tank 82 each time, and then the increased standard amount of air can enable the UV glue tank 82 to discharge a standard amount of UV glue to the top of the screw to avoid excessive or insufficient discharge of UV glue. The mechanism can seal the top of the bolt used to fix the PCB board. The sealed UV glue can not only isolate the moisture in the air from rusting the exposed surface of the top of the bolt, but also improve the stability of the screw fixing the PCB board after the UV glue contacts the PCB board.

[0039] The pressure sensor 23 is electrically connected to the input end of the PLC controller 64 through a wire, and the one-way vacuum pump 77, the ultraviolet curing lamp 86, the solenoid valve 92, the belt conveyor 12 and the motor 15 are all electrically connected to the output end of the PLC controller 64 through a wire. When the pressure of the pressure sensor 23 reaches the pressure under the preset standard tightening state of the screw, the pressure sensor 23 sends an electrical signal to the PLC controller 64, and the PLC controller 64 controls the motor 15 to cut off the power in time according to the electrical signal, and then controls the belt conveyor 12, the ultraviolet curing lamp 86 and the solenoid valve 92 to start. The above-mentioned power-on equipment and electrical connections are all existing technologies and will not be repeated here.

[0040] The operating principle of the present invention is described as follows: when the PCB board needs to be assembled to the electronic scale base, the screws are first placed in the screw feeding vibration plate 3, and then the screw feeding vibration plate 3 transports the bolts to the arc guide plate 10, and the excess screws on the arc guide plate 10 can also return to the screw feeding vibration plate 3. At the same time, the robot arm on the electronic scale production line places the electronic scale base that needs to be assembled with the PCB board on the belt conveyor 12, and at this time the position of the electronic scale base is at the assembly station of the assembly device, and the PCB board is on the electronic scale base. After the assembly is completed, the PLC controller 64 controls the belt conveyor 12 to transport the electronic scale base to other stations, and then the PLC controller 64 energizes the electromagnet 61 through the annular conductive slip ring 62 to generate magnetic attraction, thereby causing the assembly screwdriver 17 to generate magnetic attraction, and then the industrial computer 4 controls the assembly robot arm 1 to move the assembly screwdriver 17 to the arc-shaped material guide plate 10, and the assembly screwdriver 17 with magnetic attraction absorbs the screws. After that, the industrial computer 4 controls the assembly robot arm 1 to drive the assembly screwdriver 17 that absorbs the screws to the PCB board assembly station to perform PCB board assembly work;

[0041] At this time, the industrial computer 4 moves the screw to the fixing hole of the PCB board through the assembly robot arm 1, the hollow frame 14, the hollow cylinder 16 and the assembly bit 17, and then the PLC controller 64 controls the motor 15 to start, and the motor 15 drives the assembly bit 17 to rotate through the hollow cylinder 16. The rotating assembly bit 17 can screw the screw into the threaded fixing hole of the electronic scale base to complete the PCB board fixing operation, and in the later stage of the screw fixing the PCB board, as the screw penetrates into the threaded fixing hole inside the electronic scale base, the outer cover 54 is gradually squeezed by the PCB board, and the outer cover 54 pushes the moving ring 52 to squeeze the pressure sensor 23 of the installation ring 22 through the reset spring 53. When the pressure on the pressure sensor 23 reaches the preset pressure alarm threshold, the pressure sensor 23 is pressed. 23 sends an electrical signal for tightening the screw to the PLC controller 64 in time, and the PLC controller 64 controls the motor 15 and the one-way air pump 77 to stop rotating according to the electrical signal. At this time, the assembly bit 17 no longer drives the screw to rotate and tighten, thereby avoiding excessive tightening and squeezing of the screw to cause damage to the PCB board circuit, components or solder joints, and avoiding the occurrence of screw stripping and slight deformation of the electronic scale base, thereby ensuring the reliability of the electronic scale and the accuracy of weighing. This mechanism enables the electronic scale base PCB board assembly device to have the function of preventing the PCB board fixing screws from being over-tightened, thereby avoiding the occurrence of PCB board damage, screw stripping and slight deformation of the electronic scale base, thereby improving the qualified rate of PCB board assembly and ensuring the effect of the electronic scale.

[0042] While the screws are fixed by the assembly bit 17, the PLC controller 64 also controls the one-way air pump 77 to work, and the one-way air pump 77 sucks the air in the rectangular box 71, so that the rectangular box 71, the air duct 76 and the outer cover 54 are in a negative pressure environment. The outer cover 54 sucks the outside air to balance the air pressure. During the air flow process, the micro metal debris generated by the rotation and friction of the screws can enter the rectangular box 71 with the air in time, and be intercepted by the filter screen 72 and the sponge filter block 73 inside the rectangular box 71, so as to prevent these tiny metal debris from adhering to the surface of the PCB board and causing the surface of the PCB board to be disconnected, thereby ensuring the connection of the circuit. The B board can be used normally and reliably, and the air sucked by the one-way air pump 77 is then discharged through the air pipe 78, and then the air is preferentially processed through the activated carbon filter tank 87, and then sprayed into the quantitative hollow block 91 through the one-way nozzle at the bottom of the activated carbon filter tank 87. The quantitative hollow block 91 stores pressurized air. When the air pressure in the quantitative hollow block 91 reaches the preset pressure threshold of the pressure valve 88, the excess air is discharged through the pressure valve 88. This mechanism enables the electronic scale base PCB board assembly device to have the function of timely cleaning the friction debris of the PCB board assembly screws, and can ensure that the PCB board can be used normally and reliably.

[0043] When the screws used for PCB board assembly are screwed into the base of the electronic scale, the industrial computer 4 drives the assembly bit 17 away from the PCB board through the assembly robot arm 1. At the same time, the assembly robot arm 1 moves the glue spray head 84 to the top of the tightened screw. The pressure sensor 23 sends an electrical signal to the PLC controller 64 again. The PLC controller 64 controls the solenoid valve 92 and the ultraviolet curing lamp 86 to start. The ultraviolet curing lamp 86 is lit for 30 seconds. The compressed air in the quantitative hollow block 91 is sprayed into the UV glue tank 82 through the opened solenoid valve 92. Then the UV glue in the UV glue tank 82 is squeezed out of the glue spray head 84 by the air and falls on the exposed part of the top of the screw. The UV glue is ultraviolet. The curing lamp 86 irradiates for 30 seconds for rapid curing, and the cured UV glue component can seal the exposed part of the screw top to prevent the exposed part of the screw from being corroded by moisture in the air, and then avoid the generation of metal oxides that cause the PCB board surface to be disconnected and the circuit to be connected, thereby ensuring that the PCB board can work normally, and the contact between the UV glue and the PCB board surface can also improve the stability of screw tightening, and at the same time, the quantitative air delivery of the quantitative hollow block 91 can avoid excessive discharge of UV glue. This mechanism enables the electronic scale base PCB board assembly device to have the function of sealing and rust-proofing the exposed part of the screw top, which can not only ensure the normal function of the PCB board, but also improve the reliability of the use of the electronic scale.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic scale base PCB board assembly device, comprising an assembly robot arm (1), a workbench (2), a screw feeding vibration plate (3) and an industrial computer (4) for controlling the assembly robot arm (1), characterized in that: The discharge end of the screw feeding vibration plate (3) is fixedly connected to an arc-shaped material guide plate (10); the outer walls of the four support legs of the workbench (2) are fixedly connected to a support plate (11); the upper surface of the support plate (11) is fixedly connected to the bottom end of the screw feeding vibration plate (3); the upper surface of the workbench (2) is fixedly connected to a belt conveyor (12) and a support frame (13); the top end of the support frame (13) is fixedly connected to the bottom end of the assembly robot arm (1); the inner wall of the support frame (13) is fixedly connected to the outer wall of the industrial computer (4); the assembly end of the assembly robot arm (1) is fixedly connected to a hollow frame (14); the inner wall of the hollow frame (14) is fixedly connected to a motor (15); the output end of the motor (15) is connected to a The hollow frame (14) passes through the lower surface of the hollow frame and is fixedly connected with a hollow cylinder (16); the bottom end of the hollow cylinder (16) is fixedly sleeved with an assembly bit (17); the outer wall of the assembly bit (17) is fixedly sleeved with a limit ring (18) and an external thread ring (19); the outer wall of the external thread ring (19) is threadedly connected with an adjustment thread ring (20); the lower surface of the adjustment thread ring (20) is fixedly connected with two connecting rods (21); the bottom ends of the two connecting rods (21) are commonly fixedly connected with a mounting ring (22); the lower surface of the mounting ring (22) is provided with a through hole, and the hole wall of the through hole is fixedly embedded with a pressure sensor (23); the outer wall of the bottom end of the assembly bit (17) is movably sleeved with a screw over-tightening detection mechanism (5); An auxiliary mechanism (6) for assembling a screwdriver bit (17) and obtaining screws is fixedly connected to the inner wall of the hollow cylinder (16), and a cleaning mechanism (7) is fixedly connected to the side wall of the hollow frame (14); A sealing mechanism (8) is fixedly connected to the lower surface of the hollow frame (14) for preventing the top of the screw from rusting after assembly; The auxiliary mechanism (6) comprises an electromagnet (61) fixedly connected to the inner wall of the hollow cylinder (16), the bottom end of the electromagnet (61) contacts the top end of the assembly bit (17), the top outer wall of the hollow cylinder (16) is fixedly sleeved with an annular conductive slip ring (62), the outer wall of the rotating part of the annular conductive slip ring (62) is fixedly sleeved with a positioning ring (63), the top end of the positioning ring (63) is fixedly connected to the lower surface of the hollow frame (14), the fixed part wire of the annular conductive slip ring (62) passes through the inner wall of the hollow cylinder (16) and is electrically connected to the connection end of the electromagnet (61), the interior of the hollow frame (14) is fixedly connected with a PLC controller (64), and the upper wire of the rotating part of the annular conductive slip ring (62) is electrically connected to the output end of the PLC controller (64); The sealing mechanism (8) comprises a fixing plate (81) fixedly connected to the lower surface of the hollow frame (14); the outer wall of the fixing plate (81) is fixedly connected to a UV glue box (82); the bottom end of the UV glue box (82) is fixedly connected to a glue supply pipe (83); the bottom end of the glue supply pipe (83) is fixedly connected to a glue spray head (84); the side wall of the glue spray head (84) is fixedly connected to an L-shaped plate (85); the upper surface of the L-shaped plate (85) is connected to the bottom end of the fixing plate (81); The L-shaped plate (85) is fixedly connected, an oblique hole is formed on the lower surface of the L-shaped plate (85), and an ultraviolet curing lamp (86) is fixedly connected to the wall of the oblique hole; the top of the UV glue tank (82) is fixedly connected to an activated carbon filter tank (87); the top of the activated carbon filter tank (87) is fixedly connected to the gas outlet end of the gas supply pipe (78); the outer wall of the gas outlet end of the gas supply pipe (78) is fixedly connected to a pressure valve (88); and the bottom of the activated carbon filter tank (87) is fixedly connected to a quantitative component (9); The quantitative component (9) comprises a quantitative hollow block (91) fixedly sleeved on the gas outlet end of the activated carbon filter tank (87), and a side wall of the quantitative hollow block (91) is fixedly connected to a solenoid valve (92).

2. The electronic scale base PCB assembly device according to claim 1, characterized in that: The screw over-tightening detection mechanism (5) comprises a rolling bearing (51) movably sleeved with the outer wall of the bottom end of the assembly bit (17), a movable ring (52) and a return spring (53), the two ends of the return spring (53) are respectively fixedly connected to the lower surface of the movable ring (52) and the upper surface of the rolling bearing (51), and the outer wall of the outer ring of the rolling bearing (51) is fixedly sleeved with an outer cover (54).

3. The electronic scale base PCB assembly device according to claim 2, characterized in that: The outer wall of the external threaded ring (19) is fixedly connected to two symmetrically distributed nuts (24), the inner wall of the nut (24) is threadedly connected to a limit bolt (25), and the top end of the limit bolt (25) is in active contact with the lower surface of the hollow cylinder (16).

4. The electronic scale base PCB assembly device according to claim 3, characterized in that: The cleaning mechanism (7) comprises a rectangular box (71) fixedly connected to the outer wall of the hollow frame (14); a rectangular mounting hole is formed on the side wall of the rectangular box (71); a filter screen plate (72) is fixedly connected to the hole wall of the rectangular mounting hole; a sponge filter block (73) is fixedly connected to the lower surface of the filter screen plate (72); a sealing plate (74) is fixedly connected to the outer wall of the filter screen plate (72); the outer wall of the sealing plate (74) is fixedly connected to the outer wall of the rectangular box (71) by means of fixing bolts; the rectangular box (71) The inner wall of the rectangular box (71) is fixedly connected to a U-shaped sealing baffle frame (75) that matches the side wall of the filter screen plate (72); the bottom end of the rectangular box (71) is fixedly sleeved with an air guide pipe (76); the bottom end of the air guide pipe (76) is fixedly connected to the outer wall of the outer cover (54); the top end of the rectangular box (71) is fixedly connected to a one-way air pump (77); the air inlet end of the one-way air pump (77) is fixedly connected to the upper surface of the rectangular box (71) through a bent pipe; the air outlet end of the one-way air pump (77) is fixedly connected to an air supply pipe (78).

5. The assembly method of the electronic scale base PCB assembly device according to claim 4, characterized in that: The following steps are also included: Step S1: First, a screw is placed in the screw feeding vibration plate (3), and then the PLC controller (64) energizes the electromagnet (61) through the annular conductive slip ring (62) to generate magnetic attraction, thereby causing the assembly screwdriver (17) to generate magnetic attraction, and then the industrial computer (4) controls the assembly robot arm (1) to move the assembly screwdriver (17) to the arc-shaped guide plate (10), and the assembly screwdriver (17) with magnetic attraction absorbs the screw, and then the industrial computer (4) controls the assembly robot arm (1) to drive the assembly screwdriver (17) that absorbs the screw to the PCB board assembly station to perform PCB board assembly work; Step S2: the industrial computer (4) moves the screw to the fixing hole of the PCB board by assembling the mechanical arm (1), the hollow frame (14), the hollow cylinder (16) and the assembly bit (17), and then the PLC controller (64) controls the motor (15) to start, and the motor (15) drives the assembly bit (17) to rotate through the hollow cylinder (16). The rotating assembly bit (17) can screw the screw into the threaded fixing hole of the electronic scale base, thereby completing the PCB board fixing operation; Step S3: At the end of step 2, as the screw penetrates into the threaded fixing hole inside the electronic scale base, the outer cover (54) is squeezed by the PCB board gradually. After the pressure of the pressure sensor (23) in the screw over-tightening detection mechanism (5) reaches the preset pressure alarm threshold, the pressure sensor (23) sends an electrical signal indicating that the screw is tightened to the PLC controller (64). The PLC controller (64) controls the motor (15) and the one-way air pump (77) to stop rotating according to the electrical signal. At this time, the assembly bit (17) no longer drives the screw to be over-tightened. Step S4: while the screw is being fixed by the assembly bit (17), the PLC controller (64) also controls the one-way vacuum pump (77) to operate, and the cleaning mechanism (7) cleans the micro metal debris generated by the rotational friction of the screw, so as to prevent the micro metal debris from adhering to the surface of the PCB board and causing the circuit on the surface of the PCB board to be disconnected; Step S5: After the screws used for PCB board assembly are screwed into the electronic scale base, the industrial computer (4) drives the assembly bit (17) away from the PCB board through the assembly robot arm (1), and at the same time, the assembly robot arm (1) moves the glue spray head (84) to the top of the tightened screw, and then the sealing mechanism (8) sprays UV glue on the exposed part of the top of the screw. After the UV glue is cured, it can prevent the exposed part of the top of the screw from being corroded by moisture in the air.

Images