Circuit board cleaning device based on negative pressure cleaning

Abstract

The invention relates to the field of circuit board cleaning equipment, in particular to a circuit board cleaning device based on negative pressure cleaning. Comprising two conveyor belts which convey in the Y direction; a cleaning device and a dehumidifying device are sequentially arranged in the Y direction; the dehumidification device comprises two rotating sleeves, the rotating sleeves are rotationally connected to the mounting frame and arranged on the two sides of the conveying belt, a plurality of water removal holes which are evenly distributed are formed in the surfaces of the rotating sleeves, and drainage holes communicating with the water removal holes are formed in one ends of the rotating sleeves; the air extracting pump is fixedly connected to the mounting frame; one end of the suction pipe is fixedly connected to the suction pump, and the other end of the suction pipe is rotationally connected into the drainage hole; the water absorption layers are fixedly arranged on the outer side of the rotating sleeve, and the two water absorption layers abut against each other; according to the invention, the water absorption layer can be always in a state with optimal water absorption efficiency, the efficiency of cleaning liquid is improved, and the circuit board is cleaned more cleanly.

Description

Technical Field

[0001] The invention relates to the field of circuit board cleaning equipment, and in particular to a circuit board cleaning device based on negative pressure cleaning. Background Art

[0002] Water-based circuit board cleaning refers to the use of water-based cleaning fluid (i.e., cleaning fluid with water as the main solvent) to clean contaminants, flux residues, solder spatter and other impurities on electronic circuit boards. This process is usually used in the assembly process of electronic components to help improve the reliability and performance of circuit boards. Water-based cleaning is more environmentally friendly than traditional solvent cleaning (such as chlorinated solvents).

[0003] Purpose of water-based circuit board cleaning:

[0004] Removal of flux residue: Flux is a common additive in the soldering process, which may leave residues during the soldering process. Water-based cleaning can effectively remove these soldering residues.

[0005] Removal of solder spatter and dust: Spatter may be generated during the soldering process, especially in processes such as wave soldering. Water-based cleaning helps remove these impurities, ensuring a clean surface for the circuit board.

[0006] Improve product reliability: After long-term operation of electronic products, residual impurities and stains may cause the performance of circuit boards to deteriorate and even affect the life of circuit boards. Clean circuit boards can effectively reduce these problems.

[0007] Prevents Corrosion and Shorts: Cleaning helps remove stains and chemical residue that can cause corrosion or shorts on circuit boards.

[0008] A common method of water-based cleaning is spray cleaning: the surface of the circuit board is cleaned by spraying a high-pressure water-based cleaning agent, which is often used for automated cleaning in medium and high-volume production.

[0009] However, the remaining liquid needs to be blown dry or wiped clean after cleaning. Blowing dry may result in residual liquid and the wiping efficiency is too low.

[0010] Therefore, there is an urgent need to provide an improved technical solution to solve the above technical problems. Summary of the invention

[0011] The purpose of the present invention is to provide a circuit board cleaning device based on negative pressure cleaning for automatically and efficiently cleaning circuit boards in order to solve the above-mentioned technical problems.

[0012] In view of this, the present invention provides a circuit board cleaning device based on negative pressure cleaning, comprising:

[0013] Bracket;

[0014] Two mounting frames, the two mounting frames are symmetrically fixedly connected to the bracket;

[0015] Two conveyor belts, the two conveyor belts are respectively arranged on the mounting frame, and both convey along the Y direction;

[0016] Between the two mounting frames, a cleaning device and a dehumidifying device are arranged in sequence along the Y direction;

[0017] The cleaning device includes:

[0018] Two sprayers, the two sprayers are arranged oppositely on both sides of the conveyor belt in the Z direction inside the cleaning box;

[0019] A first water pump, the first water pump is fixedly connected to the mounting frame and is used to supply water to the sprinkler;

[0020] The dehumidification device includes:

[0021] Two rotating sleeves, the rotating sleeves are rotatably connected to the mounting frame and are arranged on both sides of the conveyor belt, a plurality of evenly distributed dewatering holes are arranged on the surface of the rotating sleeves, and a drainage hole connected to the dewatering hole is arranged at one end of the rotating sleeves;

[0022] A vacuum pump, which is fixedly connected to the mounting frame;

[0023] A suction pipe, one end of which is fixedly connected to the suction pump, and the other end of which is rotatably connected to the drain hole;

[0024] The water absorbing layer is fixedly arranged on the outside of the rotating sleeve, and the two water absorbing layers are in conflict with each other.

[0025] Furthermore, two groups of dehumidification devices are provided in the Y direction.

[0026] Furthermore, a plurality of circumferentially evenly distributed reeds are provided on the end of the exhaust pipe connected to the drain hole, a gap is formed between the reeds, a first limiting portion is provided at the end of the reed, a first limiting ring engaged with the first limiting portion is provided on the inner wall of the drain hole, a sealing rubber ring is sleeved on the exhaust pipe, and a second limiting portion embedded in the gap is provided in the sealing rubber ring, the width of one end of the second limiting portion connected to the sealing rubber ring is smaller than the other end, and the width of the other end of the second limiting portion is equal to the width of the reed gap, the thickness of the end of the reed close to the drain hole is smaller than the thickness close to the end of the exhaust pipe, a reset sleeve is sleeved on the outer side of the exhaust pipe, the end of the reset sleeve can be in contact with the sealing rubber ring and is arranged between the drain hole and the exhaust pipe; when the sealing rubber ring is at the end of the reed close to the drain hole, the first limiting portion is on the inner side of the first limiting ring.

[0027] Furthermore, limiting planes that abut against the side walls of the spring gap are provided on both sides of the end of the second limiting portion away from the sealing rubber ring.

[0028] Further, the conveyor belt comprises:

[0029] The embedding groove is used to insert the two side edges of the circuit board, and grooves are provided on both sides of the opening of the embedding groove.

[0030] Further, the sprayer comprises:

[0031] A spray box, the spray box includes a spray chamber, an input pipe is arranged outside the spray box, and an output pipe is arranged on the inner wall of the spray chamber;

[0032] The spray head is tilted and arranged in the opposite direction of Y toward the side close to the conveyor belt;

[0033] A mechanical shutoff valve, which is arranged in the spray chamber, is used to connect the output pipe and the spray head, and includes a pressing rod;

[0034] The linkage mechanism includes: a rotating rod, which is rotatably connected to the mounting frame; a swing rod is fixedly connected to the rotating rod; a linkage rod, one end of which is hinged to the end of the pressing rod and the other end is hinged to the end of the swing rod; one end of the driving rod is fixedly connected to the rotating rod, and the other end is provided with a roller for contacting the circuit board.

[0035] Furthermore, it also includes a liquid collecting plate, which is arranged on both sides of the opening of the lower spray box and is arranged to be inclined upward in the positive and negative directions of the Y direction respectively.

[0036] Furthermore, a recycling system is also included, including:

[0037] A recovery hole is provided at the bottom of the spray box at the lower side;

[0038] A water pump, the water pump is arranged at the bottom of the spray box, and the input end of the water pump is connected with the recovery hole;

[0039] A recovery pipe, one end of which is fixedly connected to the side wall of the input pipe of the first water pump and communicated with the input pipe of the first water pump, and the other end of which is connected to the output pipe of the water pump.

[0040] Furthermore, the water-absorbing layers at two mutually conflicting positions are compressed by 1 mm each.

[0041] Furthermore, it also includes:

[0042] Filter cotton, the filter cotton is arranged on the inner wall of the spray chamber at the lower side.

[0043] The beneficial effects of the present invention are:

[0044] 1. The present invention can always keep the water-absorbing layer in a state with the best water-absorbing efficiency, improve the efficiency of the cleaning liquid, and make the circuit board clean more thoroughly. The water-absorbing layer is arranged on the upper and lower sides of the circuit board, and the upper and lower sides of the circuit board can be cleaned at the same time without turning over; and the water-absorbing layer is arranged to roll, so that the water-absorbing layer, which is always dry, absorbs liquid, and the water-absorbing layer is in rolling contact with the circuit board to protect the water-absorbing layer, and the water-absorbing layer can also be pressed on the circuit board, so that there will be no cleaning dead corners.

[0045] 2. The present invention relies on the first limiting ring to push the sealing rubber ring 15 from one end of the reed 11 to the other end until the sealing rubber ring seals the gap between the reed and the gaps between the exhaust pipe and the drain pipe, making it easy to disassemble the exhaust pipe and making the position of the sealing rubber ring more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0047] Figure 2 It is a rear view structural schematic diagram of the present invention;

[0048] Figure 3 It is a schematic diagram of the main structure of the present invention;

[0049] Figure 4 It is a schematic diagram of the three-dimensional structure of the present invention;

[0050] Figure 5 It is a schematic diagram of the installation structure of the air extraction pipe and the drainage hole of the present invention;

[0051] Figure 6 It is a structural schematic diagram of the air extraction pipe and the reset sleeve of the present invention;

[0052] Figure 7 for Figure 3 Schematic diagram of the structure of area A in the middle.

[0053] The symbols in the figure are:

[0054] 1. Bracket; 2. Mounting frame; 3. Conveyor belt; 4. Spray box; 5. First water pump; 6. Rotating sleeve; 7. Drain hole; 8. Vacuum pump; 9. Vacuum pipe; 10. Water absorption layer; 11. Reed; 12. First limiting part; 13. Second limiting part; 14. First limiting ring; 15. Sealing rubber ring; 16. Limiting plane; 17. Embedding groove; 18. Spray head; 19. Mechanical shut-off valve; 20. Pressing rod; 21. Rotating rod; 22. Swinging rod; 23. Linking rod; 24. Roller; 25. Driving rod; 26. Liquid collecting plate; 27. Water pump; 28. Recovery pipe; 29. ​​Bevel; 30. Reset sleeve. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0056] Embodiment 1:

[0057] This embodiment provides a circuit board cleaning device based on negative pressure cleaning, comprising:

[0058] Bracket 1;

[0059] Two mounting frames 2, the two mounting frames 2 are symmetrically fixedly connected to the bracket 1;

[0060] Two conveyor belts 3, the two conveyor belts 3 are respectively arranged on the mounting frame 2, and both convey along the Y direction;

[0061] Between the two mounting frames 2, a cleaning device and a dehumidifying device are sequentially arranged along the Y direction;

[0062] The cleaning device includes:

[0063] Two sprayers, the two sprayers are arranged oppositely on both sides of the conveyor belt 3 in the Z direction inside the cleaning box;

[0064] A first water pump 5, which is fixedly connected to the mounting frame 2 and is used to supply water to the sprinkler;

[0065] The dehumidification device includes:

[0066] Two rotating sleeves 6, the rotating sleeves 6 are rotatably connected to the mounting frame 2 and are arranged on both sides of the conveyor belt 3, a plurality of evenly distributed dewatering holes are arranged on the surface of the rotating sleeve 6, and a drainage hole 7 connected to the dewatering hole is arranged at one end of the rotating sleeve 6;

[0067] An air pump 8, the air pump 8 is fixedly connected to the mounting frame 2;

[0068] An air extraction pipe 9, one end of which is fixedly connected to the air extraction pump 8, and the other end of which is rotatably connected to the drain hole 7;

[0069] The water absorbing layer 10 is fixedly arranged on the outside of the rotating sleeve 6, and the two water absorbing layers 10 are in conflict with each other.

[0070] The bracket 1 includes four columns, and the structure of the columns in groups of two is fixed by a crossbeam to form four columns with a stable structure, including but not limited to measures such as reinforcing ribs such as diagonal braces that can be added to strengthen the stable structure. Two mounting frames 2 are respectively installed on the two columns, and the two mounting frames 2 are symmetrically arranged. The upper and lower sides of the mounting frames 2 are mounting plates, and connecting plates for fixing the positions of the two mounting plates are provided at both ends of the mounting plates. Two sealing plates are provided on the opposite sides of the two mounting frames 2, and a receiving groove for accommodating a conveyor belt 3 is formed between the two sealing plates. One side of the conveyor belt 3 is placed in the receiving groove, and the upper and lower sides of the conveyor belt 3 are in conflict with the inner wall of the receiving groove; two V-type pulleys for installing the conveyor belt 3 are rotatably connected between the two mounting plates, and a driving motor is provided on the mounting plate, and the output end of the driving motor is connected to the pulley to drive the pulley to rotate. A circuit board is clamped between the two conveyor belts 3, and the conveyor belt 3 is used to transport the circuit board.

[0071] A cleaning device is also provided between the two mounting plates. The sprayer is used for water-based cleaning of the front and back sides of the circuit board on the conveyor belt 3. The first water pump 5 is arranged on the outside of the mounting frame 2, that is, on the opposite side of the sprayer. The first water pump 5 draws water from the water tank and transports it to the sprayer. It should be noted that the first water pump has two output ports, and a tee can be used on the original output port to achieve diversion.

[0072] In the transport direction (Y direction) along the conveyor belt 3, a dehumidification device is provided after the cleaning device, and the dehumidification device includes: two rotating sleeves 6, the rotating sleeves 6 are rotatably connected between the two sealing plates, one end of the rotating sleeves 6 is sealed, and the other end is provided with a drainage hole 7, a bearing is provided between the rotating sleeves 6 and the sealing plates for rotational connection, a plurality of evenly distributed drainage holes are provided on the surface of the rotating sleeves 6, and the drainage holes penetrate into the drainage holes 7, so that the drainage holes 7 and the drainage holes are connected; an air pump 8 is also fixedly provided on the mounting frame 2, and the air pump 8 is provided with suction pipes with the same number as the rotating sleeves 6, one end of the suction pipe 9 is fixedly connected to the suction pipe, and the connection method of the suction pipe 9 can be threaded connection, and the other end of the suction pipe 9 is rotatably connected in the drainage hole 7, and a water-absorbing layer 10 is wrapped and fixed on the outside of the rotating sleeve 6, and the water-absorbing layer 10 is made of a material that is easy to absorb water, such as a sponge.

[0073] Working principle:

[0074] The circuit board is put in from one end of the transmission belt, fixed between the two conveyor belts 3, and conveyed by the conveyor belt 3. The circuit board first passes through the sprayer for water-based cleaning, and then the residual liquid on the surface of the circuit board is absorbed by the water-absorbing layer 10, and combined with the vacuum pump 8, a negative pressure is formed in the water-absorbing layer 10, and the liquid attached to the water-absorbing layer 10 is sucked into the dewatering hole, and flows from the dewatering hole through the drainage hole 7 to the vacuum pipe 9. In addition, since the liquid on the water-absorbing layer 10 is cleaned, the water-absorbing layer 10 is always in a state of optimal water absorption efficiency, which improves the efficiency of the cleaning liquid and makes the circuit board clean more thoroughly. The water-absorbing layer 10 is arranged on the upper and lower sides of the circuit board, and the upper and lower sides of the circuit board can be cleaned at the same time without turning over; and the water-absorbing layer 10 is arranged to roll, so that the water-absorbing layer 10, which is always dry, absorbs liquid, and the rolling contact between the water-absorbing layer 10 and the circuit board can protect the water-absorbing layer 10, and the water-absorbing layer 10 can also be pressed on the circuit board without cleaning dead corners.

[0075] Embodiment 2:

[0076] This embodiment provides a circuit board cleaning device based on negative pressure cleaning, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0077] There are two groups of dehumidification devices in the Y direction.

[0078] Two sets of dehumidification devices are arranged, and the circuit board passes through one dehumidification device and then another dehumidification device, which can improve the cleaning quality of the residual cleaning liquid and prevent the circuit board from containing liquid.

[0079] Embodiment 3:

[0080] This embodiment provides a circuit board cleaning device based on negative pressure cleaning, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0081] A plurality of circumferentially evenly distributed spring sheets 11 are provided at the end of the exhaust pipe 9 connected to the drain hole 7, and a gap is formed between the spring sheets 11. A first limiting portion 12 is provided at the end of the spring sheet 11, and a first limiting ring 14 that is clamped with the first limiting portion 12 is provided on the inner wall of the drain hole 7. A sealing rubber ring 15 is sleeved on the exhaust pipe 9, and a second limiting portion 13 embedded in the gap is provided in the sealing rubber ring 15. The width of one end of the second limiting portion 13 connected to the sealing rubber ring 15 is smaller than that of the other end, and the width of the other end of the second limiting portion 13 is equal to the width of the gap between the spring sheets 11. The thickness of the end of the spring sheet 11 close to the drain hole 7 is smaller than that close to the end of the exhaust pipe 9. A reset sleeve is sleeved on the outer side of the exhaust pipe 9, and the end of the reset sleeve can contact the sealing rubber ring 15 and is arranged between the drain hole 7 and the exhaust pipe 9; when the sealing rubber ring 15 is at the end of the reed sheet 11 close to the drain hole 7, the first limiting portion 12 is on the inner side of the first limiting ring 14.

[0082] The reed 11 is formed at the end of the exhaust pipe 9. The reed 11 is elastic. The outer diameter of the structure formed by all the reeds 11 is the same as the end of the exhaust pipe 9. The end of the reed 11 is provided with a first limiting portion 12, and the first limiting portion 12 protrudes toward the outer peripheral side of the reed 11. All the first limiting portions 12 constitute an intermittent annular flange structure; a first limiting ring 14 is formed on the inner wall of the drainage hole 7 in the axial direction, and one side of the first limiting ring 14 is in conflict with the side of the first limiting portion 12. Due to the elasticity of the reed 11, the outer diameter of the first limiting portion 12 can be reduced, so that the first limiting portion 12 can pass through the first limiting ring 14 and then realize the clamping; a sealing rubber ring 15 that can slide along the exhaust pipe 9 is sleeved on the outside of the exhaust pipe 9, and a second limiting portion 13 that matches the gap between the reed 11 is provided on the inner side of the sealing rubber ring 15. The second limiting portion 13 are arranged in a one-to-one correspondence in the gap, and the second limiting portion 13 is interference fit with the gap, and one side of the second limiting portion 13 is in contact with the end face of the exhaust pipe 9, the width of one end of the second limiting portion 13 connected to the sealing rubber ring 15 is smaller than the other end, and the width of the other end of the second limiting portion 13 is equal to the width of the gap of the spring leaf 11, and the thickness of the end of the spring leaf 11 close to the drainage hole 7 is less than the thickness close to the end of the exhaust pipe 9. When the sealing rubber ring 15 is slid toward the side of the first limiting portion 12, due to the thinning of the thickness of the spring leaf 11, the contact area between the spring leaf 11 and the second limiting portion 13 becomes smaller, the sealing rubber ring 15 shrinks, and the gap of the spring leaf 11 becomes smaller until the gap of the spring leaf 11 is equal to the width of the second limiting portion 13 close to the side of the sealing rubber ring 15. At this time, the first limiting portion 12 can be pulled out from the first limiting ring 14, and the reset sleeve provided can push the sealing rubber ring 15.

[0083] Working principle:

[0084] The function of the sealing rubber ring 15 is to seal the gap between the drain hole 7 and the exhaust pipe 9. If a conventional sealing rubber ring 15 is used, when the exhaust pipe 9 and the drain hole 7 rotate relative to each other, the sealing rubber ring 15 may be pulled locally due to uneven friction force, resulting in uneven sealing and gaps. Therefore, the sealing rubber ring 15 is fixed to the exhaust pipe 9, and the outer diameter of the first limiting portion 12 is reduced by relying on the elasticity of the sealing rubber ring 15, so that the first limiting portion 12 can be taken out of the drain hole 7. During installation, after the first limiting portion 12 is inserted through the first limiting ring 14, the sealing rubber ring 15 is pushed from one end of the spring leaf 11 to the other end by means of the first limiting ring 14 until the sealing rubber ring 15 seals the gap between the spring leaf 11 and the gap between the exhaust pipe 9 and the drain pipe. It should be noted that the outer diameter of the sealing rubber ring 15 is always larger than the first limiting portion 12, and the outer diameter of the sealing rubber ring 15 is always larger than the outer diameter of the exhaust pipe 9, so that the first limiting ring 14 and the reset sleeve are used to push the sealing rubber ring 15.

[0085] When the rotation of the rotating sleeve 6 is hindered by excessive friction, a driving motor may be added on the opposite side of the exhaust hole of the rotating sleeve 6 to drive the rotating sleeve 6 to rotate.

[0086] Embodiment 4:

[0087] This embodiment provides a circuit board cleaning device based on negative pressure cleaning, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0088] Limiting planes 16 that abut against the side walls of the gap of the spring leaf 11 are provided on both sides of one end of the second limiting portion 13 away from the sealing rubber ring 15 .

[0089] The provided limiting plane 16 can increase the contact surface between the second limiting portion 13 and the side wall of the gap of the spring leaf 11, making the contact structure more stable and enhancing the sealing performance.

[0090] Embodiment 5:

[0091] This embodiment provides a circuit board cleaning device based on negative pressure cleaning, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0092] Conveyor belt 3 includes:

[0093] The embedding groove 17 is used to insert two side edges of the circuit board, and grooves 29 are provided on both sides of the opening of the embedding groove 17.

[0094] When placing the circuit board, since the spacing between the two conveyor belts 3 is from large to small, it is convenient to insert the two side edges of the circuit board into the embedding groove 17. The set groove 29 can assist in guiding the circuit board to be inserted into the embedding groove 17. The set embedding groove 17 can make the circuit board clamped more stably. To facilitate guiding the circuit board, the surface material of the groove 29 is smooth and hard, and the surface inside the embedding groove 17 is paved with a surface layer with a portion of elasticity.

[0095] Embodiment 6:

[0096] This embodiment provides a circuit board cleaning device based on negative pressure cleaning, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0097] The sprinkler includes:

[0098] A spray box 4, the spray box 4 includes a spray chamber, an input pipe is arranged outside the spray box 4, and an output pipe is arranged on the inner wall of the spray chamber;

[0099] The spray head 18 is tilted toward the opposite direction of Y and close to the conveyor belt 3;

[0100] A mechanical shutoff valve 19 is disposed in the spray chamber, used to connect the output pipe and the spray head 18, and includes a pressing rod 20;

[0101] The linkage mechanism includes: a rotating rod 21, which is rotatably connected to the mounting frame 2; a swing rod 22 is fixedly connected to the rotating rod 21; a linkage rod 23, one end of the linkage rod 23 is hinged to the end of the pressing rod 20, and the other end is hinged to the end of the swing rod 22; one end of the driving rod 25 is fixedly connected to the rotating rod 21, and the other end is provided with a roller 24 for contacting with the circuit board.

[0102] A spray chamber is provided inside the spray box 4, an input pipe is provided outside the spray box 4, an output pipe connected to the input pipe is provided in the spray chamber, a pipeline (not shown) for connecting the input pipe and the output pipe is provided in the wall of the spray box 4, and the spray head 18 is tilted toward the side close to the conveyor belt 3 in the opposite direction of Y, that is, the upper spray head 18 is tilted downward, and the lower spray head 18 is tilted upward, so that the spray head 18 is tilted toward the circuit board, and the mechanical shut-off valve 19 is fixedly installed in the spray box 4, and a valve core is provided in the mechanical shut-off valve 19, and a through hole is provided on the valve core, and a pressing rod 20 is connected to one end of the valve core, and the other end of the valve core is provided There is a spring for resetting. When the pressing rod 20 is pressed, the through hole on the valve core is connected to the input hole and the output hole of the mechanical shut-off valve 19; the linkage mechanism includes a rotating rod 21, one end of the rotating rod 21 is rotatably connected to the mounting frame 2, and a swing rod 22 is fixedly connected to the rotating rod 21. One end of the linkage rod 23 is hinged to the end of the pressing rod 20, and the other end of the linkage rod 23 is hinged to the end of the swing rod 22. One end of the driving rod 25 is fixedly connected to the rotating rod 21, and the other end of the driving rod 25 is provided with a roller 24 for contacting with the circuit board. The roller 24 can rotate, and a rubber layer for protecting the circuit board is provided on the roller 24.

[0103] Working principle:

[0104] When the conveyor belt 3 drives the circuit board to move in the Y direction, the surface of the circuit board contacts the roller 24, the linkage mechanism rotates, the working state of the mechanical shut-off valve 19 turns to open, and a sprayer is provided on the upper and lower parts of the circuit board. The contact of the roller 24 is the same at the position of the circuit board, so the pressure generated by the roller 24 on the circuit board offsets each other and does not affect the centering of the position of the circuit board. The inclined setting of the spray head 18 can better and more efficiently clean the surface of the circuit board. It should be noted that when the circuit board touches the roller 24, the spray head 18 starts to clean from one end of the circuit board until it is cleaned to the other end. The circuit board does not contact the roller 24, and the spray head 18 completes the cleaning. This method only performs spray cleaning when there is a circuit board, saving water resources, and the spray head 18 forms a water curtain, and the impurities generated by cleaning will not pass through the water curtain to the cleaned circuit board, and the cleaning quality is higher.

[0105] Embodiment 7:

[0106] This embodiment provides a circuit board cleaning device based on negative pressure cleaning, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0107] It also includes a liquid collecting plate 26, which is arranged on both sides of the opening of the lower spray box 4 and is inclined upward along the positive and negative directions of the Y direction respectively.

[0108] The liquid collecting plate 26 is provided to prevent the cleaning water from splashing out of the spray box 4, thereby recycling water resources and ensuring a clean working environment.

[0109] Embodiment 8:

[0110] This embodiment provides a circuit board cleaning device based on negative pressure cleaning, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0111] Also included is a recycling system, including:

[0112] A recovery hole is provided at the bottom of the spray box 4 on the lower side;

[0113] A water pump 27, the water pump 27 is arranged at the bottom of the spray box 4, and the input end of the water pump 27 is connected to the recovery hole;

[0114] The recovery pipe 28 has one end fixedly connected to the side wall of the input pipe of the first water pump 5 and communicated with the input pipe of the first water pump 5 , and the other end of the recovery pipe 28 is connected to the output pipe of the water pump 27 .

[0115] A recovery system is provided to recycle water resources. The water accumulated in the spray box 4 on the lower side is extracted by using a water pump 27 and a recovery hole, and is transported back to the output end of the water pump 27 through a recovery pipe 28 for reuse, thereby saving water resources.

[0116] Embodiment 9:

[0117] This embodiment provides a circuit board cleaning device based on negative pressure cleaning, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0118] The water-absorbing layers 10 at the two mutually conflicting positions are compressed by 1 mm each.

[0119] In order to make the contact between the water absorbing layer 10 and the circuit board closer.

[0120] Embodiment 10:

[0121] This embodiment provides a circuit board cleaning device based on negative pressure cleaning, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0122] Also includes:

[0123] Filter cotton, the filter cotton is arranged on the inner wall of the spray chamber at the lower side.

[0124] The filter cotton provided can prevent the water sprayed on the inner wall of the spray chamber from splashing, and can filter out the cleaned impurities to make the recovered water resources cleaner.

[0125] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which belong to the protection scope of the present application.

Claims

1. A circuit board cleaning device based on negative pressure cleaning, comprising: Bracket (1); Two mounting frames (2), the two mounting frames (2) are symmetrically fixedly connected to the bracket (1); Two conveyor belts (3), the two conveyor belts (3) are respectively arranged on the mounting frame (2), and both convey along the Y direction; A cleaning device and a dehumidifying device are arranged in sequence along the Y direction between the two mounting frames (2); The cleaning device includes: Two sprayers, the two sprayers are arranged opposite to each other on both sides of the conveyor belt (3) in the Z direction inside the cleaning box; A first water pump (5), the first water pump (5) is fixedly connected to the mounting frame (2) and is used to supply water to the sprinkler; The dehumidification device includes: Two rotating sleeves (6), the rotating sleeves (6) are rotatably connected to the mounting frame (2) and are arranged on both sides of the conveyor belt (3), a plurality of evenly distributed dewatering holes are arranged on the surface of the rotating sleeve (6), and a drainage hole (7) is arranged at one end of the rotating sleeve (6) and is connected to the dewatering hole; An air pump (8), the air pump (8) is fixedly connected to the mounting frame (2); An air extraction pipe (9), one end of which is fixedly connected to the air extraction pump (8) and the other end of which is rotatably connected to the drainage hole (7); The water absorbing layer (10) is fixedly arranged on the outside of the rotating sleeve (6), and the two water absorbing layers (10) are in contact with each other.

2. A circuit board cleaning device based on negative pressure cleaning according to claim 1, characterized in that: There are two groups of dehumidification devices in the Y direction.

3. A circuit board cleaning device based on negative pressure cleaning according to claim 1, characterized in that: A plurality of spring sheets (11) are evenly distributed on the circumference of the end of the air extraction pipe (9) connected to the drainage hole (7), gaps are formed between the spring sheets (11), a first limiting portion (12) is provided at the end of the spring sheet (11), a first limiting ring (14) is provided on the inner wall of the drainage hole (7) and is engaged with the first limiting portion (12), a sealing rubber ring (15) is sleeved on the air extraction pipe (9), and a second limiting portion (13) embedded in the gap is provided in the sealing rubber ring (15), and the width of one end of the second limiting portion (13) connected to the sealing rubber ring (15) is smaller than that of the first limiting portion (12). At the other end, the width of the other end of the second limiting portion (13) is equal to the width of the gap of the reed (11), the thickness of the end of the reed (11) close to the drainage hole (7) is less than the thickness of the end close to the exhaust pipe (9), a reset sleeve is sleeved on the outer side of the exhaust pipe (9), the end of the reset sleeve can abut on the sealing rubber ring (15) and is arranged between the drainage hole (7) and the exhaust pipe (9); when the sealing rubber ring (15) is at the end of the reed (11) close to the drainage hole (7), the first limiting portion (12) is on the inner side of the first limiting ring (14).

4. A circuit board cleaning device based on negative pressure cleaning according to claim 1, characterized in that: Limiting planes (16) that abut against side walls of the gap of the spring leaf (11) are provided on both sides of one end of the second limiting portion (13) away from the sealing rubber ring (15).

5. The circuit board cleaning device based on negative pressure cleaning according to claim 1, characterized in that: The conveyor belt (3) comprises: The embedding groove (17) is used for inserting two side edges of the circuit board, and grooves (29) are provided on both sides of the opening of the embedding groove (17).

6. A circuit board cleaning device based on negative pressure cleaning according to claim 1, characterized in that: The sprinkler includes: A spray box (4), the spray box (4) comprises a spray chamber, an input pipe is arranged outside the spray box (4), and an output pipe is arranged on the inner wall of the spray chamber; A spray head (18), the spray head (18) is tilted toward the opposite direction of Y and close to the conveyor belt (3); A mechanical shutoff valve (19), which is arranged in the spray chamber, used for connecting the output pipe and the spray head (18), and includes a pressing rod (20); The linkage mechanism comprises: a rotating rod (21), the rotating rod (21) is rotatably connected to the mounting frame (2); a swing rod (22) is fixedly connected to the rotating rod (21); a linkage rod (23), one end of the linkage rod (23) is hinged to the end of the pressing rod (20), and the other end is hinged to the end of the swing rod (22); one end of the driving rod (25) is fixedly connected to the rotating rod (21), and the other end is provided with a roller (24) for contacting with the circuit board.

7. A circuit board cleaning device based on negative pressure cleaning according to claim 1, characterized in that: It also includes a liquid collecting plate (26), which is arranged on both sides of the opening of the spray box (4) on the lower side and is arranged to be inclined upward in the positive and negative directions of the Y direction respectively.

8. A circuit board cleaning device based on negative pressure cleaning according to claim 6, characterized in that: Also included is a recycling system, including: A recovery hole, which is arranged at the bottom of the spray box (4) at the lower side; A water pump (27), the water pump (27) is arranged at the bottom of the spray box (4), and the input end of the water pump (27) is connected to the recovery hole; A recovery pipe (28), one end of which is fixedly connected to the side wall of the input pipe of the first water pump (5) and communicates with the input pipe of the first water pump (5), and the other end of which is connected to the output pipe of the water pump (27).

9. The circuit board cleaning device based on negative pressure cleaning according to claim 1, characterized in that: The two water-absorbing layers (10) at the mutually conflicting positions are compressed by 1 mm each.

10. The circuit board cleaning device based on negative pressure cleaning according to claim 8, characterized in that: Also includes: Filter cotton, the filter cotton is arranged on the inner wall of the spray chamber at the lower side.

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