AGV vehicle-mounted high-stability waterproof shock-absorbing circuit board structure

Abstract

The utility model provides a kind of AGV vehicle-mounted high-stability waterproof shock attenuation circuit board structure, including circuit board body and mounting seat, the two sides of the mounting seat length direction are equipped with receiving groove, the receiving groove inner cavity forms funnel shape with upper wide and lower narrow cross section, the bottom end of the receiving groove is connected U type siphon pipe;Circuit board body and mounting seat are fixedly connected by array distribution silica gel damping column group, the circuit board body bottom four corners are fixed with magneto-rheological fluid layer by epoxy adhesive pasting, the magneto-rheological fluid layer is encapsulated in flexible sealing cavity, electromagnetic coil is installed in the flexible sealing cavity inner cavity bottom, the electromagnetic coil electrically connected vehicle-mounted ECU, viscosity is controlled by electromagnetic coil;The upper surface of the circuit board body is covered three layers composite waterproof structure, including bottom layer epoxy resin moisture-proof layer, middle layer graphene heat conduction net, surface layer fluorosilane hydrophobic membrane.Avoiding water corrosion circuit board, avoid the case of resonance failure under high-frequency vibration.

Description

Technical Field

[0001] This utility model relates to the field of circuit board technology, and in particular to a high-stability waterproof and shock-absorbing circuit board structure for AGV vehicles. Background Technology

[0002] The Chinese authorization announcement number is CN210093772U, and the authorization announcement date is February 18, 2020. Specifically, it relates to a shock-resistant power circuit board, including a fixing groove. A base is fixedly connected to the inner bottom wall of the fixing groove. Two symmetrical slots are formed on the upper surface of the base. A sliding rod is fixedly connected inside each slot, and a slip ring adapted to the sliding rod is fitted onto the middle of the outer surface of each sliding rod. This shock-resistant power circuit board can better buffer vertical vibration forces through the tension of a third spring during vibration. It can also better buffer and weaken horizontal vibration forces through the movement of the slip ring pushing the second spring during vibration, thereby better protecting the circuit board body and improving the shock resistance of the device, avoiding damage to the circuit board body. The tension of the first spring can better stabilize the circuit board body by rotating the nut, preventing damage to the circuit board body due to overtightening. The drawback of this prior art is that water easily accumulates in the fixing groove, and the water can only be effectively drained by disassembly, making operation extremely inconvenient. Given this situation, improvement is urgently needed. Utility Model Content

[0003] Based on this, the purpose of this utility model is to provide a high-stability waterproof and shock-absorbing circuit board structure for AGV vehicles, so as to avoid water accumulation and corrosion of the circuit board and to avoid resonance failure under high-frequency vibration.

[0004] This utility model provides an AGV vehicle-mounted high-stability waterproof and shock-absorbing circuit board structure, including a circuit board body and a mounting base. The mounting base has storage grooves on both sides along its length. The inner cavity of the storage groove forms a funnel shape with a wider top and narrower bottom cross-section. The bottom end of the storage groove is connected to a U-shaped siphon tube. The surface of the storage groove is lower than the surface of the circuit board body. The circuit board body has guide plates on both opposite sides facing the storage groove.

[0005] The circuit board body and the mounting base are fixedly connected by an array of silicone damping pillars.

[0006] The bottom four corners of the circuit board body are fixed with a magnetorheological fluid layer by epoxy adhesive. The magnetorheological fluid layer is encapsulated in a flexible sealed cavity. An electromagnetic coil is installed at the bottom of the flexible sealed cavity. The electromagnetic coil is electrically connected to the vehicle ECU and the viscosity is controlled by the electromagnetic coil.

[0007] The upper surface of the circuit board body is covered with a three-layer composite waterproof structure, including a bottom epoxy resin moisture-proof layer, a middle graphene thermal conductive mesh, and a surface fluorosilane hydrophobic film.

[0008] Both of the two storage slots are equipped with L-shaped mounting parts on opposite sides, and the inner side of the L-shaped mounting parts is fitted with an annular sealing flange that is interference-fitted with the equipment base.

[0009] Preferably, the inner wall surface of the receiving groove is uniformly distributed with V-shaped flow guiding grooves, and the groove wall of the V-shaped flow guiding groove is coated with a hydrophobic polytetrafluoroethylene coating with a friction coefficient ≤0.05.

[0010] Preferably, the silicone damping column group is arranged in a 10mm×10mm matrix, with a column diameter of 5mm, a height of 8mm, and a hardness of 60±5Shore A; the compression rate of the silicone damping column group is 40%-60%, and an anti-slip rubber pad with a thickness of 0.5mm is fixedly installed at the bottom of the silicone damping column.

[0011] Preferably, the bottom epoxy resin moisture-proof layer is 0.1 mm thick, the middle graphene thermal conductive mesh has a pore size of 0.5 mm, and the surface fluorosilane hydrophobic film has a contact angle >150°.

[0012] Preferably, the height of the annular sealing flange is 2mm.

[0013] Preferably, the magnetorheological fluid layer is a mixture of carbonyl iron powder and silicone oil; the thickness of the flexible sealing cavity is 1.5 mm; and the electromagnetic coil is a planar spiral with a diameter of approximately 8 mm.

[0014] Preferably, the annular sealing flange is made of thermoplastic elastomer material with a compression deformation rate of 15±2%.

[0015] Preferably, the surface fluorosilane hydrophobic film is embedded with silica nanoparticles with a particle size of 50-100 nm.

[0016] Preferably, the end of the receiving groove is provided with an anti-backflow valve at the connection between it and the U-shaped siphon tube, with the valve opening pressure being 0.1 kPa.

[0017] Preferably, a thermal expansion compensation groove is formed on the upper surface of the mounting base, with a groove width of 1 mm and a depth penetrating 50% of the thickness of the mounting base.

[0018] The beneficial effects of this utility model are as follows: the combination structure of the funnel-shaped storage groove and the U-shaped siphon tube utilizes gravity and siphon effect to automatically drain water and prevent water accumulation from corroding the circuit board; the upper surface of the circuit board body is covered with a three-layer composite waterproof structure, with layered material function design to achieve static anti-permeability and dynamic hydrophobicity; a group of silicone damping columns is set, and the rubber material provides stable support, with a compression ratio of 40%-60% to adapt to deformation; by setting a magnetorheological fluid layer, the viscosity of the magnetorheological fluid changes in real time with the magnetic field, avoiding resonance failure under high-frequency vibration. Attached Figure Description

[0019] Figure 1 This is a structural view of the present invention.

[0020] Figure 2 This is a structural view of the magnetorheological fluid layer.

[0021] Figure 3 It has a three-layer composite waterproof structure.

[0022] Figure 4 This is a structural view of the L-shaped mounting section.

[0023] Figure 5 This is a schematic diagram of the signal sensing layer.

[0024] The attached figures are labeled as follows: circuit board body 10, mounting base 11, thermal expansion compensation groove 12, storage groove 13, guide plate 14, epoxy adhesive 15, anti-backflow valve 16, U-shaped siphon tube 17, annular sealing flange 18, silicone damping column group 19, magnetorheological fluid layer 20, flexible sealing cavity 21, electromagnetic coil 22, anti-slip rubber pad 23, bottom epoxy resin moisture-proof layer 26, middle graphene thermal conductive mesh 25, surface fluorosilane hydrophobic film 24, L-shaped mounting part 27. Detailed Implementation

[0025] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with specific embodiments and accompanying drawings.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Please refer to Figure 1-5As shown, this utility model provides an AGV vehicle-mounted high-stability waterproof and shock-absorbing circuit board structure, including a circuit board body 10 and a mounting base 11. The mounting base 11 has storage grooves 13 on both sides along its length. The inner cavity of the storage groove 13 forms a funnel shape with a wider top and narrower bottom cross-section. The bottom end of the storage groove 13 is connected to a U-shaped siphon tube 17. The surface of the storage groove 13 is lower than the surface of the circuit board body 10. The circuit board body 10 has guide plates 14 on both sides facing the storage groove 13.

[0028] The circuit board body 10 and the mounting base 11 are fixedly connected by an array of silicone damping pillars 19. A magnetorheological fluid layer 20 is adhered to the four bottom corners of the circuit board body 10 using epoxy adhesive 15. The magnetorheological fluid layer 20 is encapsulated in a flexible sealed cavity 21. An electromagnetic coil 22 is installed at the bottom of the flexible sealed cavity 21. The magnetorheological fluid layer 20 is a mixture of carbonyl iron powder and silicone oil. The thickness of the flexible sealed cavity 21 is 1.5 mm. The electromagnetic coil 22 is a planar spiral with a diameter of approximately 8 mm. The electromagnetic coil 22 is electrically connected to the vehicle ECU, and its viscosity is controlled. A dual-mode switching is performed based on the AGV acceleration data: Mode 1 (acceleration < 0.5g): current 0.2A, viscosity 1.0 Pa·s; Mode 2 (acceleration ≥ 0.5g): current 0.8A, viscosity 8.0 Pa·s.

[0029] The upper surface of the circuit board body 10 is covered with a three-layer composite waterproof structure, including a bottom epoxy resin moisture-proof layer 26, a middle graphene thermal conductive mesh 25, and a surface fluorosilane hydrophobic film 24; the bottom epoxy resin moisture-proof layer 26 is 0.1mm thick, the pore size of the middle graphene thermal conductive mesh 25 is 0.5mm, and the contact angle of the surface fluorosilane hydrophobic film 24 is >150°.

[0030] Both sides of the two storage slots 13 are equipped with L-shaped mounting parts 27, which are rigidly locked to the equipment base to prevent loosening due to vibration. An annular sealing flange 18 is embedded inside the L-shaped mounting part 27 and is interference-fitted with the equipment base. The height of the annular sealing flange 18 is 2mm. The annular sealing flange 18 is made of thermoplastic elastomer material with a compression deformation rate of 15±2%. The thermoplastic elastomer material sealing flange compensates for unevenness on the cabinet mounting surface, improves sealing reliability, and ensures the AGV body can withstand high-frequency vibration; therefore, bolted connections need to be reinforced to resist shear force.

[0031] The inner wall surface of the receiving groove 13 is uniformly distributed with V-shaped flow guiding grooves. The walls of the V-shaped flow guiding grooves are coated with a polytetrafluoroethylene hydrophobic coating 31, with a friction coefficient ≤0.05. A surface fluorosilane hydrophobic film 24 embeds silica nanoparticles with a particle size of 50-100 nm. The polytetrafluoroethylene hydrophobic coating 31 reduces fluid resistance, while the nanoparticles enhance mechanical wear resistance.

[0032] The silicone damping column group 19 is arranged in a 10mm×10mm matrix, with a column diameter of 5mm, a height of 8mm, and a hardness of 60±5ShoreA; the compression rate of the silicone damping column group 19 is 40%-60%, and an anti-slip rubber pad 23 with a thickness of 0.5mm is fixedly installed at the bottom of the silicone damping column.

[0033] At the connection point between the end of the receiving trough 13 and the U-shaped siphon tube 17, there is an anti-backflow valve 16 with an opening pressure of 0.1 kPa. The anti-backflow valve blocks backflow caused by bumps.

[0034] A thermal expansion compensation groove 12 is formed on the upper surface of the mounting base 11. The groove is 1mm wide and its depth extends through 50% of the thickness of the mounting base to prevent the epoxy adhesive layer from cracking and eliminate sealing failure caused by thermal deformation of the circuit board.

[0035] In this embodiment, a funnel-shaped storage trough and a U-shaped siphon tube are combined to automatically drain water using gravity and siphon effect, preventing water accumulation from corroding the circuit board. The upper surface of the circuit board is covered with a three-layer composite waterproof structure with layered material functions to achieve static anti-permeability and dynamic hydrophobicity. A group of silicone damping columns is set, and the rubber material provides stable support, with a compression ratio of 40%-60% to adapt to deformation. By setting a magnetorheological fluid layer, the viscosity of the magnetorheological fluid changes in real time with the magnetic field, avoiding resonance failure under high-frequency vibration.

[0036] The production process for this embodiment is as follows:

[0037] 1. Mounting bracket assembly manufacturing:

[0038] 1) Injection-molded mounting base: manufactured using a precision injection molding machine;

[0039] 2) Processing the thermal expansion compensation groove: using an ultraviolet laser cutting machine;

[0040] 3) Install the U-shaped siphon: Use a hot plate welder + ultrasonic welder.

[0041] 2. Circuit board processing:

[0042] 1) Magnetorheological fluid layer encapsulation: carbonyl iron powder (70%) + silicone oil (30%) filler; polyimide film hot-press encapsulation, 1.5mm thick, produced by vacuum potting machine + hot press machine;

[0043] 2) Electromagnetic coil integration: The planar spiral coil is mounted on the bottom of the sealed cavity; the lead wires are printed with silver paste using a precision chip mounter and screen printing machine;

[0044] 3) Three-layer composite waterproof structure coating: ① Epoxy resin spraying (0.1mm) → 80℃ curing; ② Graphene mesh screen printing (pore size 0.5mm); ③ Fluorosilane nanofilm vapor deposition; using automatic spraying line + screen printing machine + PECVD equipment.

[0045] 3. Assembly and Testing:

[0046] 1) Silicone column array bonding: using an automated dispensing machine + UV curing lamp;

[0047] 2) Circuit board and mounting base assembly: Epoxy adhesive is applied to the bottom of the magnetorheological fluid layer, and it is pressed together with the vibration damping base of the mounting base using a precision alignment pressing machine;

[0048] 3) Environmental adaptability test: Rain test chamber + electromagnetic vibration table.

[0049] In this embodiment, the hardware connection details are as follows:

[0050] 1. ECU output terminal → drive circuit: shielded twisted pair cable (0.5mm diameter) 2 The magnetic ring suppresses high-frequency interference;

[0051] 2. Drive circuit → Electromagnetic coil: Four coils connected in parallel; overcurrent protection (threshold 1.0A); reverse diode for surge protection;

[0052] 3. Power input: Vehicle-mounted 24VDC to 5VDC module (efficiency ≥90%), ripple <50mV.

[0053] In this embodiment, the electromagnetic coil drive adopts a constant current source circuit to ensure current accuracy of ±5%; the acceleration signal is denoised by Kalman filtering algorithm to avoid false triggering; the connector is TE AMPSEAL 16-pin with IP69K protection level, which is suitable for the high humidity environment of AGV.

[0054] The above-described embodiments are merely one implementation of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A high-stability, waterproof, and shock-absorbing circuit board structure for AGV vehicles, comprising a circuit board body (10) and a mounting base (11), characterized in that: The mounting base (11) has storage slots (13) on both sides along its length. The inner cavity of the storage slot (13) is formed into a funnel shape with a wider top and narrower bottom. The bottom end of the storage slot (13) is connected to a U-shaped siphon tube (17). The surface of the storage slot (13) is lower than the surface of the circuit board body (10). The circuit board body (10) has guide plates (14) on both sides facing the storage slot (13). The circuit board body (10) and the mounting base (11) are fixedly connected by an array of silicone damping pillars (19). The bottom four corners of the circuit board body (10) are glued and fixed with a magnetorheological fluid layer (20) by epoxy glue (15). The magnetorheological fluid layer (20) is encapsulated in a flexible sealed cavity (21). An electromagnetic coil (22) is installed at the bottom of the flexible sealed cavity (21). The electromagnetic coil (22) is electrically connected to the vehicle ECU and the viscosity is controlled by the electromagnetic coil (22). The upper surface of the circuit board body (10) is covered with a three-layer composite waterproof structure, including a bottom epoxy resin moisture-proof layer (26), a middle graphene thermal conductive mesh (25), and a surface fluorosilane hydrophobic film (24). Both sides of the two storage slots (13) are equipped with L-shaped mounting parts (27), and the inner side of the L-shaped mounting parts (27) is fitted with an annular sealing flange (18) that is interference-fitted with the equipment base.

2. The AGV vehicle-mounted high-stability waterproof and shock-absorbing circuit board structure according to claim 1, characterized in that: The inner wall surface of the receiving groove (13) is uniformly distributed with V-shaped flow guiding grooves, and the groove wall of the V-shaped flow guiding groove is coated with a polytetrafluoroethylene hydrophobic coating (31) with a friction coefficient ≤0.

05.

3. The AGV vehicle-mounted high-stability waterproof and shock-absorbing circuit board structure according to claim 1, characterized in that: The silicone damping column group (19) is arranged in a 10mm×10mm matrix, with a column diameter of 5mm, a height of 8mm, and a hardness of 60±5Shore A; the compression rate of the silicone damping column group (19) is 40%-60%, and an anti-slip rubber pad (23) with a thickness of 0.5mm is fixedly installed at the bottom of the silicone damping column.

4. The AGV vehicle-mounted high-stability waterproof and shock-absorbing circuit board structure according to claim 1, characterized in that: The bottom epoxy resin moisture-proof layer (26) is 0.1 mm thick, the middle graphene thermal conductive mesh (25) has a pore size of 0.5 mm, and the surface fluorosilane hydrophobic film (24) has a contact angle of >150°.

5. The AGV vehicle-mounted high-stability waterproof and shock-absorbing circuit board structure according to claim 1, characterized in that: The height of the annular sealing flange (18) is 2 mm.

6. The AGV vehicle-mounted high-stability waterproof and shock-absorbing circuit board structure according to claim 1, characterized in that: The magnetorheological fluid layer (20) is configured as a mixture of carbonyl iron powder and silicone oil; the thickness of the flexible sealing cavity (21) is set to 1.5 mm; the electromagnetic coil (22) is in a planar spiral shape with a diameter of about 8 mm.

7. The AGV vehicle-mounted high-stability waterproof and shock-absorbing circuit board structure according to claim 1, characterized in that: The annular sealing flange (18) is made of thermoplastic elastomer material with a compression deformation rate of 15±2%.

8. The AGV vehicle-mounted high-stability waterproof and shock-absorbing circuit board structure according to claim 1, characterized in that: The surface fluorosilane hydrophobic film (24) is embedded with silica nanoparticles with a particle size of 50-100 nm.

9. The AGV vehicle-mounted high-stability waterproof and shock-absorbing circuit board structure according to claim 1, characterized in that: An anti-backflow valve (16) is provided at the connection between the end of the receiving groove (13) and the U-shaped siphon tube (17), with a valve opening pressure of 0.1 kPa.

10. The AGV vehicle-mounted high-stability waterproof and shock-absorbing circuit board structure according to claim 1, characterized in that: The upper surface of the mounting base (11) is provided with a thermal expansion compensation groove (12), which is 1 mm wide and has a depth that extends through 50% of the thickness of the mounting base.

Images