A sealing device for printed circuit board processing

Abstract

The invention discloses a glue sealing device for printed circuit board processing, which belongs to the technical field of glue sealing for printed circuit boards. The device comprises an operation cabinet and a loading and unloading unit mounted on the operation cabinet, wherein a two-axis displacement unit is mounted in the operation cabinet, and a glue injection unit for glue sealing is mounted on the two-axis displacement unit, wherein the glue injection unit comprises a back plate and a glue injection head mounted on the back plate, and a glue outlet assembly is mounted on the bottom end of the glue injection head. Through the provided glue injection unit and the moving unit, a connecting rod can hit a ring frame to cause a glue outlet pipe to generate micro-vibration during the process, which helps to reduce the flow resistance of the glue material, improve the fluidity, reduce the internal pores, and improve the quality of glue sealing. At the same time, after the glue sealing is completed, the scraper ring is driven to move downward by the moving unit to automatically remove the residual glue on the inner wall of the glue outlet pipe, thereby extending the service life of the hose and reducing the replacement frequency.

Description

Technical Field

[0001] The invention relates to the technical field of printed circuit board sealing, and in particular to a sealing device for printed circuit board processing. Background Art

[0002] Printed circuit boards, also known as printed circuit boards, are providers of electrical connections for electronic components. Printed circuit boards can be divided into single-sided boards, double-sided boards, four-layer boards, six-layer boards and other multi-layer boards according to the number of layers of the circuit boards. After the electronic components are installed on the printed circuit boards, they need to be sealed with glue.

[0003] The existing sealing method is usually to manually hold the glue barrel and then squeeze the barrel wall to make the glue inside flow out from the hose outlet to the circuit board surface or to use a machine to seal the circuit board, each of which has its advantages.

[0004] Whether the circuit board is sealed by manual operation or mechanized means, glue will often remain inside the glue hose after the operation is completed. These residual glue will adhere tightly to the tube wall after drying, which will have an adverse effect on the subsequent use of the glue hose. In order to ensure the normal subsequent sealing, the glue hose needs to be replaced frequently. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the residual glue will tightly adhere to the tube wall after drying, causing adverse effects on the subsequent use of the glue outlet tube, and in order to ensure the normal subsequent sealing, the glue outlet tube needs to be replaced frequently. A glue sealing device for printed circuit board processing is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A glue sealing device for printed circuit board processing, comprising an operating cabinet and a loading and unloading unit mounted on the operating cabinet, wherein a two-axis displacement unit is mounted in the operating cabinet, and a glue injection unit for glue sealing is mounted on the two-axis displacement unit, wherein the glue injection unit comprises a back plate and a glue injection head mounted on the back plate, and a glue discharge assembly is mounted at the bottom end of the glue injection head;

[0008] The glue discharging assembly comprises a glue discharging head threadedly connected to the outlet of the glue injection head, a glue discharging pipe is connected to the outer wall of the glue discharging head through a first spring, a scraper ring is slidably installed in the glue discharging pipe, and a moving unit is installed on the outer wall of the glue discharging pipe;

[0009] The mobile unit includes a mounting frame fixed on the back plate and a servo motor mounted on the mounting frame, a threaded rod with a top end connected to the output end of the servo motor is rotatably connected to the middle of the mounting frame, a moving sleeve is threadedly sleeved on the outer surface of the threaded rod, and retaining frames sleeved on the rubber outlet pipe are mounted on both sides of the moving sleeve, and an electromagnet is fixed in the retaining frame;

[0010] The scraper ring is fixed to the electromagnet by magnetic attraction after being energized, and moves downward together with the electromagnet following the movable sleeve driven by the rotating threaded rod, so that the residual colloid on the inner wall of the rubber outlet pipe is scraped off.

[0011] As a further description of the above technical solution:

[0012] A valve sheet is fixed inside the glue dispensing head, and a connecting shaft is rotatably connected to the inner wall of the glue dispensing head near the bottom of the valve sheet through an inner contraction groove. A support sheet is fixed to one end of the connecting shaft, and a torsion spring is sleeved on the connecting shaft for limiting the support sheet from rotating upward in a horizontal state.

[0013] As a further description of the above technical solution:

[0014] The scraper ring has an inner wall with a mounting hole, in which a curved clamping column is connected via a second spring, and a clamping hole corresponding to the curved clamping column is formed on the outer wall of one end of the glue outlet head extending into the glue outlet pipe, and the clamping holes are evenly divided into two groups;

[0015] A group of the clamping holes located above are close to the support sheet, so that after the scraper ring moves upward until the arc clamping column is clamped into the clamping hole located above, the support sheet can be supported by the part of the arc clamping column extending into the glue discharge head, so that it will not move downward after being subjected to external force.

[0016] As a further description of the above technical solution:

[0017] The lower surface of the raised portion of the outer wall of the glue outlet head is connected to a sealing ring for covering the card hole located above through a third spring, and a silicone ring is fixed to the top of the inner wall of the glue outlet pipe, wherein the inner wall of one of the silicone rings abuts against the outer wall of the glue outlet head, and the inner wall of the other silicone ring abuts against the outer wall of the glue injection head;

[0018] Two groups of fifth springs are fixed on the inner wall of the glue outlet pipe, and one end of the two groups of fifth springs are both against the outer wall of the glue injection head.

[0019] As a further description of the above technical solution:

[0020] The retaining frame includes a connecting rod fixed to the moving sleeve and a ring frame sleeved on the outer surface of the rubber outlet pipe, and the electromagnet is fixed on the inner wall of the ring frame;

[0021] The upper surfaces of the connecting rod and the ring frame are both plugged with plug blocks through slots, and a connecting plate is fixed to the tops of the two plug blocks. The connecting plate is provided with two knob bolts, and the connecting plate is fixed to the connecting rod and the ring frame through the knob bolts.

[0022] As a further description of the above technical solution:

[0023] A slider is slidably installed on the back plate by opening a sliding groove, one end of the slider is detachably fixed with a connecting block by a knob stud, one end of the connecting block is fixed with a mounting block by a fourth spring, and the mounting block is fixed to the upper surface of the connecting plate.

[0024] As a further description of the above technical solution:

[0025] A circular magnet is fixed to one end of the arc-surface clamping column that passes through the mounting hole. When the electromagnet is energized, the polarity of the inner magnetic pole is opposite to the polarity of the magnetic pole of the circular magnet facing one end of the electromagnet. After the direction of the current is changed, the polarity of the inner magnetic pole of the electromagnet is the same as the polarity of the magnetic pole of the circular magnet facing one end of the electromagnet.

[0026] As a further description of the above technical solution:

[0027] The loading and unloading unit includes a frame installed on both sides of the operating cabinet, a conveyor for conveying circuit boards is installed on one side of the operating cabinet close to the rubber outlet pipe, guide rods are fixed on both sides of the front of the frame, a lead screw is rotatably connected to the middle of the front of the frame, a first motor is fixed on the upper surface of the frame, and the output end of the first motor is connected to one end of the lead screw.

[0028] As a further description of the above technical solution:

[0029] The screw rod is connected to a support frame via a screw nut, and a loading rack and a receiving rack are detachably fixed on the front of the two support frames. A positioning frame is fixed on one side of one of the frames, and the positioning frame is equipped with a cylinder for pushing the circuit board in the loading rack to the surface of the conveyor.

[0030] As a further description of the above technical solution:

[0031] The two-axis displacement unit includes a horizontal frame fixed on the operating cabinet, a horizontal screw rod is rotatably connected to the middle of the horizontal frame, a second motor is installed on one side of the horizontal frame, an output end of the second motor is connected to one end of the horizontal screw rod, the horizontal screw rod is connected to a vertical frame through a horizontal screw nut, and the vertical frame is slidably connected to the horizontal frame;

[0032] A vertical screw rod is rotatably connected to the vertical frame, a third motor is installed on the lower surface of the vertical frame, an output end of the third motor is connected to one end of the vertical screw rod, the vertical screw rod is connected to the back plate through a vertical screw nut, and the back plate is slidably connected to the vertical frame.

[0033] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0034] By setting up the injection unit and the moving unit, it is achieved that during the process, the connecting rod can hit the ring frame to cause the rubber outlet pipe to generate micro-vibration, which helps to reduce the flow resistance of the rubber material, improve fluidity, reduce internal pores, and improve the quality of sealing. At the same time, after the sealing is completed, the scraper ring is driven downward by the moving unit to automatically remove the residual rubber on the inner wall of the rubber outlet pipe, thereby extending the service life of the rubber pipe and reducing the frequency of replacement. At the same time, when not in use, the arc-surface clamping column can be sent into the clamping hole above to block the support sheet, so that the valve sheet is supported and will not open downward due to pressure, thereby preventing the rubber material from accidentally gushing out and avoiding the waste of rubber material and environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of a three-dimensional structure provided in an embodiment of the present invention is shown;

[0036] Figure 2 It shows a schematic diagram of the internal structure of a glue discharging assembly provided by an embodiment of the present invention after being partially cut away;

[0037] Figure 3 The embodiment of the present invention provides Figure 2 The enlarged view of point A in the middle;

[0038] Figure 4 It shows a schematic diagram of the internal structure of a glue dispensing head after being cut open according to an embodiment of the present invention;

[0039] Figure 5 It shows a schematic structural diagram of a connecting rod and a ring frame fixed together according to an embodiment of the present invention;

[0040] Figure 6 The embodiment of the present invention provides Figure 5 The enlarged view of point B in the middle;

[0041] Figure 7 It shows a schematic structural diagram of a curved clamping column provided in an embodiment of the present invention being located below a supporting sheet;

[0042] Figure 8 The embodiment of the present invention provides Figure 7 Enlarged view of point C in the middle;

[0043] Fig. 9 A schematic diagram showing the structure of the interior of an operating cabinet according to an embodiment of the present invention is shown;

[0044] Fig.10 It shows a schematic structural diagram of the connection rod and the ring frame after being separated according to an embodiment of the present invention;

[0045] Fig.11 The embodiment of the present invention provides Fig.10 The enlarged view of point D in the middle;

[0046] Fig.12 A schematic structural diagram of a ring frame provided according to an embodiment of the present invention is shown.

[0047] Legend:

[0048] 10. Operation cabinet;

[0049] 20. Loading and unloading unit; 21. Frame; 22. Conveyor; 23. Loading rack; 24. Receiving rack; 25. Cylinder;

[0050] 30. Two-axis displacement unit;

[0051] 40. Glue injection unit; 41. Glue injection head; 42. Glue discharging assembly; 421. Glue discharging head; 422. First spring; 423. Glue discharging tube; 424. Scraper ring; 425. Valve sheet; 426. Support sheet; 427. Second spring; 428. Arc clamping column; 429. Round magnet; 4210. Sealing ring; 43. Back plate; 44. Knob stud;

[0052] 50. Moving unit; 51. Mounting frame; 52. Threaded rod; 53. Moving sleeve; 54. Retaining frame; 541. Connecting rod; 542. Ring frame; 543. Insert block; 544. Connecting plate; 55. Electromagnet; 56. Servo motor. DETAILED DESCRIPTION

[0053] 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.

[0054] like Figure 1 - Fig.12 As shown, the present invention provides:

[0055] A sealing device for printed circuit board processing, comprising an operating cabinet 10 and a loading and unloading unit 20 mounted on the operating cabinet 10, wherein the loading and unloading unit 20 comprises a frame 21 mounted on both sides of the operating cabinet 10, and a conveyor 22 for conveying circuit boards is mounted on one side of the operating cabinet 10 near a glue outlet pipe 423, and preferably, the conveyor 22 is a vacuum adsorption conveyor, which has a vacuum adsorption function and can adsorb and fix the material on its surface during the conveying process and then move it, guide rods are fixed on both sides of the front of the frame 21, a screw rod is rotatably connected to the middle of the front of the frame 21, and a first motor is fixed on the upper surface of the frame 21, and the output end of the first motor is connected to one end of the screw rod;

[0056] A support frame is connected to the screw rod through a screw nut, and a loading rack 23 and a receiving rack 24 are detachably fixed on the front of the two support frames, and a positioning frame is fixed on one side of one of the frames 21, and a cylinder 25 for pushing the circuit board in the loading rack 23 to the surface of the conveyor 22 is assembled on the positioning frame. Preferably, a first cylinder is fixed on the side of the inner wall of the operating cabinet 10 close to the receiving rack 24, and a top plate is fixed to one end of the piston rod of the first cylinder, and a second cylinder is fixed to the lower surface of the top plate, and a push plate is fixed to one end of the piston rod of the second cylinder. The first cylinder is placed in a vertical position, which is used to control the top plate to drive the second cylinder to move up and down, and the second cylinder is placed in a horizontal position, which is used to control the left and right movement of the push plate;

[0057] Specifically, before the actual operation, the loading rack 23 containing the shelled printed circuit boards to be sealed is installed on the support frame on the left side of the operating cabinet 10. During the operation, the first motor on the left frame 21 is started to rotate the screw connected thereto, so that the left support frame moves downward with the loading rack 23, so that the bottom shelled printed circuit board moves to a position corresponding to the end of the piston rod of the cylinder 25, and then the cylinder 25 is started to push the shelled printed circuit board to gradually slide out of the loading rack 23 to the surface of the conveyor 22, and then the shelled printed circuit board is driven by the conveyor 22 to move to the bottom of the injection unit 40, and so on and so forth, and a shelled printed circuit board is continuously driven to move to the bottom of the injection unit 40, as shown in FIG. Fig. 9 As shown, the two printed circuit boards with shells are now sealed with glue;

[0058] It is worth noting that after the sealing is completed, the conveyor 22 is started again to convey the sealed circuit board to the right. In the initial state, the lowermost receiving position of the material receiving rack 24 corresponds to the surface of the conveyor 22. When the sealed circuit board moves to the bottom of the second cylinder, the first cylinder first drives the second cylinder to move downward until the push plate moves to the left side of the circuit board, and then the second cylinder is started to move the push plate from left to right, thereby driving the circuit board to move from left to right and gradually being pushed into the material receiving rack 24. This reciprocating process completes the storage of the two sealed circuit boards.

[0059] like Figure 1 and Fig. 9 As shown, a two-axis displacement unit 30 is installed in the operating cabinet 10, and the two-axis displacement unit 30 includes a horizontal frame fixed on the operating cabinet 10, a horizontal screw rod is rotatably connected in the middle of the horizontal frame, a second motor is installed on one side of the horizontal frame, an output end of the second motor is connected to one end of the horizontal screw rod, the horizontal screw rod is connected to a vertical frame through a horizontal screw nut, and the vertical frame is slidably connected to the horizontal frame;

[0060] A vertical screw rod is rotatably connected to the vertical frame, a third motor is installed on the lower surface of the vertical frame, an output end of the third motor is connected to one end of the vertical screw rod, the vertical screw rod is connected to the back plate 43 through a vertical screw nut, and the back plate 43 is slidably connected to the vertical frame;

[0061] Specifically, in actual use, the second motor controls the rotation of the transverse screw rod, which can drive the vertical frame together with the glue injection unit 40 to move left and right, changing its lateral position. At the same time, when the shelled printed circuit board to be sealed with glue moves to the bottom of the glue injection unit 40, the third motor controls the glue injection unit 40 to move downward, so that the bottom end of the glue outlet tube 423 extends into the inner cavity of the shelled printed circuit board. At this time, the glue sealing operation can be carried out. After the glue sealing is completed, the glue injection unit 40 can be driven to move upward again.

[0062] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 7 and Fig.10 As shown, the two-axis displacement unit 30 is equipped with a glue injection unit 40 for sealing. In particular, the glue injection unit 40 is connected to an external glue injection device, which is a well-known technology and will not be described in detail here. The glue injection unit 40 includes a back plate 43 and a glue injection head 41 mounted on the back plate 43;

[0063] The bottom end of the glue injection head 41 is equipped with a glue discharge assembly 42, which includes a glue discharge head 421 threadedly connected to the outlet of the glue injection head 41, a glue discharge pipe 423 is connected to the outer wall of the glue discharge head 421 through a first spring 422, a scraper ring 424 is slidably installed in the glue discharge pipe 423, and two groups of fifth springs are fixed on the inner wall of the glue discharge pipe 423, one end of the two groups of fifth springs are against the outer wall of the glue injection head 41;

[0064] A valve sheet 425 is fixed inside the glue dispensing head 421. A connecting shaft is rotatably connected to the inner wall of the glue dispensing head 421 near the lower part of the valve sheet 425 through an inner contraction groove. A supporting sheet 426 is fixed to one end of the connecting shaft. A torsion spring is sleeved on the connecting shaft for limiting the supporting sheet 426 from rotating upward in a horizontal state.

[0065] Specifically, during the glue injection process, the glue enters the glue outlet head 421 and drives the valve sheet 425 to open downward. At the same time, since the support sheet 426 is not restricted in this state, it will also rotate downward due to the pressure and will not block the valve sheet 425.

[0066] A mounting hole is provided on the inner wall of the scraper ring 424, and a curved clamping column 428 is connected to the mounting hole through a second spring 427. A clamping hole corresponding to the curved clamping column 428 is provided on the outer wall of one end of the glue discharge head 421 extending into the glue discharge pipe 423. The clamping holes are evenly divided into two groups, and the upper group of clamping holes is close to the support sheet 426. When the scraper ring 424 moves upward until the curved clamping column 428 is clamped into the upper clamping hole, the support sheet 426 can be supported by the portion of the curved clamping column 428 extending into the glue discharge head 421, so that the support sheet 426 will not move downward after being subjected to external force.

[0067] The lower surface of the raised portion of the outer wall of the glue outlet head 421 is connected to a sealing ring 4210 for covering the card hole located above through a third spring, and a silicone ring is fixed to the top of the inner wall of the glue outlet tube 423, wherein the inner wall of one silicone ring abuts against the outer wall of the glue outlet head 421, and the inner wall of the other silicone ring abuts against the outer wall of the glue injection head 41;

[0068] A circular magnet 429 is fixed to one end of the arc-surface clamping column 428 that penetrates into the mounting hole. When the electromagnet 55 is energized, the polarity of the inner magnetic pole is opposite to the polarity of the magnetic pole of the circular magnet 429 facing the end of the electromagnet 55. After the current direction is changed, the polarity of the inner magnetic pole of the electromagnet 55 is the same as the polarity of the magnetic pole of the circular magnet 429 facing the end of the electromagnet 55. It is worth noting that the spring, torsion spring and other structures used cannot be magnetically attracted;

[0069] Specifically, after use, the energized electromagnet 55 is moved upward to move the scraper ring 424 upward together, thereby pushing the sealing ring 4210 upward. When the arc-surface clamping column 428 is stuck in the upper clamping hole, it stops moving. At this time, the current direction is changed to change the polarity of the inner magnetic pole of the electromagnet 55 to the same as the polarity of the magnetic pole of the circular magnet 429 facing one end of the electromagnet 55, so that the inner side of the electromagnet 55 produces a repulsive force on the circular magnet 429, thereby allowing the arc-surface clamping column 428 to remain protruding from the inner wall of the glue discharge head 421, and thereby supporting the support sheet 426 to prevent it from moving downward, so that when the device is accidentally started to discharge glue during the non-use stage, the support sheet 426 can prevent the valve sheet 425 from opening downward, so that the glue is blocked, thereby avoiding waste of glue and preventing accidental outflow of glue to pollute the operating cabinet 10. It is worth noting that in the initial state, the arc-surface clamping column 428 in the scraper ring 424 is in the clamping hole below.

[0070] like Figure 2 , Figure 5 , Fig.11 and Fig.12As shown, a moving unit 50 is mounted on the outer wall of the glue outlet pipe 423, and the moving unit 50 includes a mounting frame 51 fixed on the back plate 43 and a servo motor 56 mounted on the mounting frame 51. The middle part of the mounting frame 51 is rotatably connected with a threaded rod 52 whose top end is connected to the output end of the servo motor 56. A moving sleeve 53 is threadedly sleeved on the outer surface of the threaded rod 52. Both sides of the moving sleeve 53 are equipped with a retaining frame 54 sleeved on the glue outlet pipe 423. An electromagnet 55 is fixed in the retaining frame 54. Preferably, a positioning stud is threadedly penetrated on the outer wall of the moving sleeve 53. When the positioning stud is tightened, the moving sleeve 53 will rotate together with the threaded rod 52.

[0071] The scraper ring 424 is magnetically fixed to the electromagnet 55 after being energized, and moves downward together with the electromagnet 55 following the movable sleeve 53 driven by the rotating threaded rod 52 , so that the residual colloid on the inner wall of the rubber outlet pipe 423 is removed.

[0072] like Figure 2 , Figure 6 , Fig.10 and Fig.12 As shown, the retaining frame 54 includes a connecting rod 541 fixed to the moving sleeve 53 and a ring frame 542 sleeved on the outer surface of the rubber outlet pipe 423, and the electromagnet 55 is fixed on the inner wall of the ring frame 542. The upper surfaces of the connecting rod 541 and the ring frame 542 are both plugged with plug blocks 543 through slots, and the tops of the two plug blocks 543 are commonly fixed with a connecting plate 544, and two knob bolts are provided on the connecting plate 544. The connecting plate 544 is fixed to the connecting rod 541 and the ring frame 542 through the knob bolts;

[0073] A slider is slidably mounted on the back plate 43 by opening a slide groove, one end of the slider is detachably fixed with a connecting block by a knob stud 44, one end of the connecting block is fixed with a mounting block by a fourth spring, and the mounting block is fixed to the upper surface of the connecting plate 544;

[0074] Specifically, when the glue is sealed, the connecting rod 541 is not connected to the ring frame 542. At this time, the connecting plate 544 is only connected and fixed to the ring frame 542 by the knob bolt, and the plug block 543 previously connected to the connecting rod 541 is exposed to one end of the ring frame 542 and is convex. At this time, when the connecting rod 541 rotates, the protruding plug block 543 drives the ring frame 542 to move to one side, and the mounting block on the connecting plate 544 is connected and fixed to the slider by the knob stud 44. In this state, the ring frame 542 is still sleeved on the glue outlet pipe 423;

[0075] At this time, after tightening the positioning bolt, the servo motor 56 is started to make the threaded rod 52 drive the moving sleeve 53 to rotate together, so that the connecting rod 541 on the moving sleeve 53 will also rotate together, thereby driving the ring frame 542 to drive the rubber outlet pipe 423 to swing slightly, and cooperate with the first spring 422 and the fifth spring to make the rubber outlet pipe 423 vibrate slightly when resetting, so that the end of the rubber outlet pipe 423 vibrates the rubber injected into the printed circuit board with shell. It is worth noting that the end of the rubber outlet pipe 423 needs to extend into the inner cavity of the printed circuit board with shell, but cannot contact the surface of the circuit board;

[0076] In the process of micro-vibrating the rubber material, its flow resistance can be reduced, its fluidity can be improved, and it can be made more uniform. At the same time, it helps to reduce the number of internal pores during the sealing process. Through vibration, the tiny bubbles inside the sealing material can be promoted to merge into large bubbles and accelerate their discharge process.

[0077] It is worth noting that by inserting the plug block 543 connected to the ring frame 542 at the bottom of the connecting plate 544 into the slots at different positions, the position of the exposed plug block 543 is changed, so that when the connecting rod 541 rotates with the moving sleeve 53, the plug block 543 can be pressed against to make the rubber outlet pipe 423 swing back and forth, and the first spring 422 and the fifth spring are cooperated to make the rubber outlet pipe 423 vibrate slightly, and the amplitude of the vibration is different according to the different positions of the plug block 543;

[0078] After the sealing work is completed, the knob stud 44 is first unscrewed to separate the slider from the mounting block, and then the connecting plate 544 is taken out forward after the knob bolt is unscrewed. At this time, the connecting rod 541 is rotated to a state of being in contact with the end of the ring frame 542, and the two plug blocks 543 on the connecting plate 544 are respectively inserted into the connecting rod 541 and the ring frame 542, and then the knob bolt is tightened so that the connecting plate 544 fixes the connecting rod 541 and the ring frame 542 together, and then the positioning bolt is loosened to move the sleeve 53, and the fixing of the movable sleeve 53 is released. At this time, the movable sleeve 53 no longer follows The threaded rod 52 rotates together, and the power of the electromagnet 55 is turned on at this time, magnetically attracting the scraper ring 424, and then the servo motor 56 is started to rotate the threaded rod 52, so that the movable sleeve 53 drives the connecting rod 541 and the ring frame 542 to move downward, so that the electromagnet 55 drives the scraper ring 424 in the rubber outlet pipe 423 to move downward, so that the rubber remaining on the inner wall of the rubber outlet pipe 423 is scraped off by the scraper ring 424, thereby preventing the rubber from drying and affecting the next use of the rubber outlet pipe 423, so that the rubber outlet pipe 423 can be reused and the frequency of replacement is reduced.

[0079] Specifically, when the printed circuit board processing sealing device is working / in use:

[0080] 1. Preparation stage: Install the loading rack 23 with the shelled printed circuit board to be sealed on the support frame on the left side of the operating cabinet 10, and check whether each unit (such as the conveyor 22, the injection unit 40, the moving unit 50, etc.) is in normal working condition;

[0081] 2. Loading operation: Start the first motor on the left frame 21 to rotate the screw rod, driving the loading rack 23 to move downward until the bottom circuit board corresponds to the end of the piston rod of the cylinder 25. At this time, start the cylinder 25 to push the circuit board to the surface of the conveyor 22, and the conveyor 22 transports it to the bottom of the injection unit 40;

[0082] 3. Glue injection operation: The glue injection unit 40 is controlled by the second motor and the third motor to move left and right and up and down, so that the bottom end of the glue outlet pipe 423 extends into the inner cavity of the circuit board, and then the glue injection equipment is started, and the glue enters the glue outlet head 421, driving the valve sheet 425 to open downward to perform the glue sealing operation. During the glue injection process, the glue outlet pipe 423 is slightly vibrated to improve the fluidity of the glue and reduce the internal pores. By adjusting the position of the plug 543 connected to the ring frame 542 at the bottom of the connecting plate 544, the vibration amplitude of the glue outlet pipe 423 can be changed;

[0083] 5. Material collection operation: After the sealing is completed, the conveyor 22 is started to convey the sealed circuit board to the right side of the material collection rack 24, and the first cylinder and the second cylinder cooperate to push the circuit board into the material collection rack 24;

[0084] 6. Cleaning the rubber hose: After the sealing work is completed, unscrew the knob stud and the knob bolt, fix the connecting rod 541 and the ring frame 542 together, start the power supply of the electromagnet 55, magnetically attract the scraper ring 424, and then start the servo motor 56 to rotate the threaded rod 52, drive the scraper ring 424 to move downward, and remove the residual rubber on the inner wall of the rubber hose 423.

[0085] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A glue sealing device for printed circuit board processing, comprising an operating cabinet (10) and a loading and unloading unit (20) mounted on the operating cabinet (10), wherein a two-axis displacement unit (30) is mounted in the operating cabinet (10), and a glue injection unit (40) for glue sealing is mounted on the two-axis displacement unit (30), wherein the glue injection unit (40) comprises a back plate (43) and a glue injection head (41) mounted on the back plate (43), characterized in that: The bottom end of the glue injection head (41) is equipped with a glue outlet assembly (42); The glue discharge assembly (42) comprises a glue discharge head (421) threadedly connected to the outlet of the glue injection head (41); a glue discharge pipe (423) is connected to the outer wall of the glue discharge head (421) via a first spring (422); a scraper ring (424) is slidably installed in the glue discharge pipe (423); and a moving unit (50) is mounted on the outer wall of the glue discharge pipe (423); The moving unit (50) comprises a mounting frame (51) fixed on a back plate (43) and a servo motor (56) mounted on the mounting frame (51); a threaded rod (52) whose top end is connected to an output end of the servo motor (56) is rotatably connected to the middle of the mounting frame (51); a moving sleeve (53) is threadedly sleeved on the outer surface of the threaded rod (52); retaining frames (54) sleeved on a rubber outlet pipe (423) are mounted on both sides of the moving sleeve (53); an electromagnet (55) is fixed inside the retaining frame (54); The scraper ring (424) is magnetically fixed to the electromagnet (55) after being energized, and moves downward together with the electromagnet (55) and the movable sleeve (53) driven by the rotating threaded rod (52), so that the residual colloid on the inner wall of the rubber outlet pipe (423) is removed.

2. A sealing device for printed circuit board processing according to claim 1, characterized in that: A valve sheet (425) is fixed inside the glue dispensing head (421), and a connecting shaft is rotatably connected to the inner wall of the glue dispensing head (421) below the valve sheet (425) through an inner contraction groove, and a support sheet (426) is fixed to one end of the connecting shaft. A torsion spring is sleeved on the connecting shaft for limiting the support sheet (426) from rotating upward in a horizontal state.

3. A sealing device for printed circuit board processing according to claim 2, characterized in that: A mounting hole is provided on the inner wall of the scraper ring (424), a curved clamping column (428) is connected to the mounting hole via a second spring (427), and a clamping hole corresponding to the curved clamping column (428) is provided on the outer wall of one end of the glue outlet head (421) extending into the glue outlet pipe (423), and the clamping holes are evenly divided into two groups; A group of the clamping holes located at the top are close to the support sheet (426), so that after the scraper ring (424) moves upward until the arc clamping column (428) is clamped into the clamping hole located at the top, the support sheet (426) can be supported by the part of the arc clamping column (428) extending into the glue discharge head (421), so that it will not move downward after being subjected to external force.

4. A sealing device for printed circuit board processing according to claim 3, characterized in that: The lower surface of the raised portion of the outer wall of the glue outlet head (421) is connected to a sealing ring (4210) for covering the card hole located above through a third spring, and a silicone ring is fixed to the top of the inner wall of the glue outlet tube (423), wherein the inner wall of one of the silicone rings abuts against the outer wall of the glue outlet head (421), and the inner wall of the other silicone ring abuts against the outer wall of the glue injection head (41); Two groups of fifth springs are fixed on the inner wall of the glue outlet pipe (423), and one end of the two groups of fifth springs are both against the outer wall of the glue injection head (41).

5. A sealing device for printed circuit board processing according to claim 1, characterized in that: The retaining frame (54) comprises a connecting rod (541) fixed to the moving sleeve (53) and a ring frame (542) sleeved on the outer surface of the rubber outlet pipe (423), and the electromagnet (55) is fixed on the inner wall of the ring frame (542); The upper surfaces of the connecting rod (541) and the ring frame (542) are both plugged with plug blocks (543) through slots, and the top ends of the two plug blocks (543) are commonly fixed with a connecting plate (544), and the connecting plate (544) is provided with two knob bolts. The connecting plate (544) is fixed to the connecting rod (541) and the ring frame (542) through the knob bolts.

6. A sealing device for printed circuit board processing according to claim 5, characterized in that: A slider is slidably mounted on the back plate (43) by opening a slide groove, one end of the slider is detachably fixed with a connecting block via a knob stud (44), one end of the connecting block is fixed with a mounting block via a fourth spring, and the mounting block is fixed to the upper surface of the connecting plate (544).

7. A sealing device for printed circuit board processing according to claim 3, characterized in that: A circular magnet (429) is fixed to one end of the arc-surface clamping column (428) that penetrates into the mounting hole. When the electromagnet (55) is energized, the polarity of the inner magnetic pole is opposite to the polarity of the magnetic pole of the circular magnet (429) facing one end of the electromagnet (55). After the current direction is changed, the polarity of the inner magnetic pole of the electromagnet (55) is the same as the polarity of the magnetic pole of the circular magnet (429) facing one end of the electromagnet (55).

8. A sealing device for printed circuit board processing according to claim 1, characterized in that: The loading and unloading unit (20) comprises a frame (21) mounted on both sides of an operating cabinet (10); a conveyor (22) for conveying circuit boards is mounted on one side of the operating cabinet (10) near the rubber outlet pipe (423); guide rods are fixed on both sides of the front of the frame (21); a lead screw is rotatably connected to the middle of the front of the frame (21); a first motor is fixed on the upper surface of the frame (21); and an output end of the first motor is connected to one end of the lead screw.

9. A sealing device for printed circuit board processing according to claim 8, characterized in that: The screw rod is connected to a support frame via a screw nut, and a loading frame (23) and a receiving frame (24) are detachably fixed on the front of the two support frames. A positioning frame is fixed on one side of one of the frames (21), and a cylinder (25) is installed on the positioning frame for pushing the circuit board in the loading frame (23) to the surface of the conveyor (22).

10. A sealing device for printed circuit board processing according to claim 9, characterized in that: The two-axis displacement unit (30) comprises a horizontal frame fixed on the operating cabinet (10), a horizontal screw rod is rotatably connected to the middle of the horizontal frame, a second motor is mounted on one side of the horizontal frame, an output end of the second motor is connected to one end of the horizontal screw rod, the horizontal screw rod is connected to a vertical frame via a horizontal screw nut, and the vertical frame is slidably connected to the horizontal frame; A vertical screw rod is rotatably connected to the vertical frame, a third motor is installed on the lower surface of the vertical frame, an output end of the third motor is connected to one end of the vertical screw rod, the vertical screw rod is connected to a back plate (43) via a vertical screw nut, and the back plate (43) is slidably connected to the vertical frame.

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