Circuit board cleaning equipment

Abstract

The utility model belongs to the technical field of circuit board processing, and particularly relates to circuit board cleaning equipment. The device comprises a shell, a bubbling pipe, a compressed air valve, a drain valve, a first heater, a second heater, a water pump and a cylinder cover, a cleaning tank and a liquid storage tank are arranged in the shell, the first heater is installed at the bottom of the cleaning tank, the second heater is installed at the bottom of the liquid storage tank, and one end of the bubbling pipe penetrates through the outer wall of the shell to be connected with the compressed air valve. The cylinder cover is movably arranged at the top end of the cleaning tank, a spraying device is arranged on the cylinder cover, the water pump is connected with the spraying device through a spraying pipe, and the end, connected with the water pump, of the spraying pipe is located at the bottom of the liquid storage tank. The surface of a cleaned circuit board is completely soaked by a water-based cleaning agent, compressed air rushed out of the bottom of the water tank impacts the surface of the circuit board to remove stains, and meanwhile the circuit board is cleaned and washed through the spraying device.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit board processing, and in particular relates to circuit board cleaning equipment. Background Art

[0002] Circuit board cleaning is a cleaning process for the flux residues formed after the surface assembly and soldering of printed circuit boards and the pollutants generated during the assembly process. It removes the residual organic and inorganic pollutants such as rosin (R, RA, RMA), water-soluble flux (OA), no-clean flux and lead-free solder paste on the surface of SMT / THT and PCB boards.

[0003] Currently, the commonly used cleaning methods for circuit boards are mainly solvent cleaning, ultrasonic cleaning, and water-based spray cleaning.

[0004] The solvent cleaning process generally uses a special circuit board cleaning agent, which can effectively remove stains on the circuit board, such as board washing water, alcohol and other solvents. Select a suitable cleaning agent, spray or soak the cleaning agent on the circuit board, and then manually wipe the surface of the circuit board with a brush. The solvent cleaning process is generally operated manually, with low production efficiency and prone to poor consistency. The selected solvents are generally volatile or flammable and explosive items. The volatile properties are likely to cause physiological harm to the operator, and the flammable and explosive properties have high requirements for the storage and cleaning environment of the solvent, and the management cost is high.

[0005] The ultrasonic cleaning process improves the cleaning effect through the vibration of sound waves. Put the circuit board to be cleaned into the ultrasonic cleaning tank, add an appropriate amount of cleaning liquid, and the ultrasonic wave can vibrate the stains to achieve the cleaning effect. The sound waves generated in the ultrasonic cleaning process can easily cause irreversible damage to compact components, so ultrasonic cleaning is not suitable for cleaning high-integration precision circuit boards.

[0006] The water-based spray cleaning process generally selects a suitable semi-aqueous cleaning agent and sprays the cleaning agent onto the surface of the circuit board through a spray device. The stains are softened and dissolved by the water-based cleaning agent and then washed away by the sprayed water-based cleaning agent to achieve the cleaning effect. During the water-based spray cleaning process, since the water column randomly ejected from the nozzle cannot completely cover the entire board during cleaning, it is easy to produce a cleaning blind area between circuit boards. Therefore, the distance between circuit boards needs to be adjusted according to the size of the circuit board. The larger the size of the circuit board, the larger the required spacing. The resulting problem is that the circuit board is not cleaned thoroughly or the cleaning efficiency is low. At the same time, the price of fully automatic water-based spray equipment is high. Utility Model Content

[0007] The utility model aims to solve the problems of the prior art and proposes a circuit board cleaning device, which can achieve that the surface of the circuit board to be cleaned is completely soaked in a water-based cleaning agent, and the compressed air flushed out from the bottom of the water tank impacts the surface of the circuit board to remove stains, and at the same time, the circuit board is cleaned and flushed through a spray device.

[0008] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0009] A circuit board cleaning device comprises a shell, a control device, a bubbling tube, a compressed air valve, a first heater, a second heater, a water pump, a cylinder cover and a height adjustment device, wherein a cleaning tank and a liquid storage tank are arranged in the shell, the control device is installed on the outer wall of the shell, the control device is connected to the first heater and the second heater, and is used to control the switches of the first heater and the second heater, the first heater is installed at the bottom of the cleaning tank, the second heater is installed at the bottom of the liquid storage tank, one end of the bubbling tube passes through the outer wall of the shell and is connected to the compressed air valve, and the other end is arranged at the bottom of the cleaning tank, the water pump is installed in the shell, the cylinder cover is arranged at the top of the cleaning tank, a spray device is arranged on the cylinder cover, the water pump is connected to the spray device through a spray pipe, and one end of the spray pipe connected to the water pump is located at the bottom of the liquid storage tank, the control device is connected to the water pump, and is used to control the switch of the water pump, a height adjustment device is arranged in the cleaning tank, a circuit board to be cleaned is placed in the height adjustment device, and the height adjustment device is used to adjust the height of the circuit board to be cleaned in the cleaning tank.

[0010] Furthermore, it also includes a filter pump, a filter, a filter tube and a switching switch, the filter pump and the filter are installed in the shell, one end of the filter tube is located at the bottom of the cleaning tank, the filter tube is connected to the filter pump and the filter in sequence, and the other end is connected to the switching switch, the switching switch is also connected to a first switching tube and a second switching tube, the first switching tube is connected to the cleaning tank, and the second switching tube is connected to the liquid storage tank, the control device also includes a circulation filtering switch, and the circulation filtering switch is connected to the filter pump.

[0011] Furthermore, a plurality of small holes are opened on the tube wall of the bubbling tube located in the cleaning tank.

[0012] Furthermore, the height adjustment device is a cleaning basket, and partition racks are provided at different heights on the inner wall of the cleaning basket. The partition racks are used to place partitions, and the circuit boards to be cleaned are placed on the partitions.

[0013] Furthermore, the cleaning basket is made of stainless steel.

[0014] Furthermore, an observation window is provided on the cylinder cover.

[0015] Furthermore, the drain valve is installed below the shell and is connected to the cleaning tank through a drain pipe.

[0016] Furthermore, the four universal wheels are installed at the bottom of the shell.

[0017] Compared with the prior art, the utility model has the following significant advantages: 1) The utility model solves the problem of blind spots in circuit board cleaning caused by spray cleaning by soaking the entire board. 2) The utility model can not only ensure the uniformity of the temperature of the cleaning liquid in the cleaning tank through the circulation of the cleaning liquid, but the provided filtering device can also prevent the excess materials cleaned from returning to the circuit board for a second time. 3) The utility model can fully soften the stains on the surface of the circuit board and the bottom of the chip through the bubbling and soaking cleaning method, and remove the stains through the impact force of compressed air. Finally, the circuit board is deeply cleaned again by spraying the cleaning liquid. 4) The manufacturing cost of the utility model is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a perspective view of the utility model;

[0019] Figure 2 This is a schematic diagram of the cylinder head of the utility model;

[0020] Figure 3 It is a schematic diagram of the cleaning basket of the utility model.

[0021] Explanation of the reference numerals: 1. outer shell, 2. first control panel, 3. second control panel, 4. bubbling tube, 5. compressed air valve, 6. drain valve, 7. first heater, 8. second heater, 9. water pump, 10. cylinder head, 11. filter pump, 12. filter, 13. filter tube, 14. cleaning basket, 15. universal wheel, 16. cleaning tank, 17. liquid storage tank, 18. switching switch, 19. spray arm, 20. partition rack, 21. partition. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0023] The utility model discloses a circuit board cleaning device, such as Figure 1As shown, it includes a housing 1, a control device, a bubbling tube 4, a compressed air valve 5, a drain valve 6, a first heater 7, a second heater 8, a water pump 9, a cylinder head 10, a filter pump 11, a filter 12, a filter tube 13, a cleaning basket 14 and four universal wheels 15. A cleaning tank 16, a liquid storage tank 17 and a switch 18 are arranged in the housing 1. The control device includes a first control panel 2 and a second control panel 3, which are mounted on the outer wall of the housing 1. The first control panel 2 includes a first power switch, a first heating switch, a first temperature control button and a circulation filter switch. The first heating switch and the first temperature control button are connected to the first heater 7. The first temperature control button can set the temperature and read the sensor temperature. After comparing the sensor temperature with the preset temperature, the first heater 7 is controlled to be turned on or off. The first heating switch is used to manually turn on the first heater 7 or stop it in an emergency. The second control panel 3 includes a second power switch, a second heating switch, a second temperature control button and a spray switch. The second heating switch and the second temperature control button are connected to the second heater 8. The second temperature control button can set the temperature, read the sensor temperature, and control the second heater 8 to turn on or off after comparing the sensor temperature with the preset temperature. The second heating switch is used to manually turn on the second heater 8 or emergency stop. The first heater 7 is installed at the bottom of the cleaning tank 16, and the second heater 8 is installed at the bottom of the liquid storage tank 17. The first power switch is the main switch for controlling the power supply of the device host, the first heating switch is the control switch of the first heater 7 in the cleaning tank 16, the first temperature control button is used to set the temperature of the cleaning liquid in the cleaning tank 16, the second power switch is the switch of the second control panel 3, the second heating switch is the control switch of the second heater 8 in the liquid storage tank 17, the second temperature control button is used to set the temperature of the cleaning liquid in the liquid storage tank 17, the first heater 7 is used to heat the temperature of the cleaning liquid in the cleaning tank 16, and the second heater 8 is used to heat the temperature of the cleaning liquid in the liquid storage tank 17.

[0024] One end of the bubbling tube 4 passes through the outer wall of the housing 1 and is connected to the compressed air valve 5, and the other end is arranged at the bottom of the cleaning tank 16. The bubbling tube 4 is located in the cleaning tank 16 and has a plurality of small holes on its wall. The bubbling tube 4 generates bubbles from the bottom of the cleaning tank 16 through the small holes arranged on the bubbling tube 4, and the bubbles are impacted upward. The compressed air valve 5 is used to control the flow rate of the compressed air in the bubbling tube 4.

[0025] The drain valve 6 is installed below the housing 1 and is connected to the cleaning tank 16 through a drain pipe. The drain valve 6 is used to assist in draining the cleaning liquid in the cleaning tank 16. A drain valve and a drain pipe can also be provided at the bottom of the liquid storage tank to facilitate cleaning and drainage of the liquid storage tank.

[0026] The water pump 9 is installed in the housing 1, and the cylinder cover 10 is movably arranged on the top of the cleaning tank 16. Figure 2As shown, a spray device is provided on the cylinder head 10. In this embodiment, the spray device is a spray arm 19. The water pump 9 is connected to the spray arm 19 through a spray pipe. One end of the spray pipe connected to the water pump is located at the bottom of the liquid storage tank 17. The spray switch is connected to the water pump 9. The water pump 9 is used to generate a high-pressure water flow through the water pump 9 to transport the cleaning liquid in the liquid storage tank 17 to the spray arm 19 on the cylinder head 10. The spray arm 19 sprays by spraying the high-pressure water flow from the hole of the spray arm 19. The spray arm 19 can adopt a structure with a rotating function to realize rotary spraying.

[0027] The filter pump 11 and the filter 12 are installed in the housing 1. One end of the filter tube 13 is located at the bottom of the cleaning tank 16. The filter tube is connected to the filter pump 11 and the filter 12 in sequence, and the other end is connected to the switch 18. The switch 18 is also connected to a first switch tube and a second switch tube. The first switch tube is connected to the cleaning tank 16, and the second switch tube is connected to the liquid storage tank 17. The switch 18 is arranged on the outside of the housing 1. The switch 18 is a three-way valve body, which is used to switch between the two modes of internal circulation of the cleaning liquid and liquid storage tank injection. When switched to the first switch tube, it is the cleaning liquid internal circulation mode, and when switched to the second switch tube, it is the liquid storage tank injection mode. The circulation filter switch is connected to the filter pump 11 and the filter 12. The filter pump 11 is used to circulate the cleaning liquid in the cleaning tank 16 in the cleaning liquid internal circulation mode; the filter 12 is used to filter particulate impurities in the cleaning liquid.

[0028] The cleaning basket 14 can be placed in the cleaning tank 16 and is not connected to other parts of the cleaning equipment. The cleaning basket 14 is made of stainless steel and is used to place the cleaned circuit board. Figure 3 As shown, partition racks 20 are provided at different heights of the inner wall of the cleaning basket 14, and the partition racks 20 are used to place partitions 21. When the partitions 21 are placed in the cleaning basket 14, the cleaned circuit boards are placed on the partitions 21, and the height of the cleaned circuit boards in the cleaning basket 14 can be adjusted.

[0029] Four universal wheels 15 are installed at the bottom of the housing 1 to support the device and facilitate the movement of the device.

[0030] Temperature sensors are installed in the cleaning tank 16 and the liquid storage tank 17 respectively, for feeding back the temperature of the cleaning liquid and determining whether the cleaning liquid reaches the set temperature.

[0031] The specific method of using this embodiment in application is as follows:

[0032] 1) The circuit boards to be cleaned are fixed in series with metal rods, and the circuit boards are placed vertically at the bottom of the cleaning basket 14. The bottom of the cleaning basket 14 may be pre-placed with a partition 21, or may not be pre-placed with a partition 21;

[0033] 2) placing the cleaning basket 14 into the cleaning tank 16;

[0034] 3) Inject a semi-aqueous cleaning agent as a cleaning liquid into the cleaning tank 16. When the cleaning liquid level completely covers the upper surface of the circuit board, stop injecting the cleaning liquid, switch 18 to the cleaning liquid internal circulation mode, and cover the tank cover 10;

[0035] 4) Turn on the first power switch and the circulation filter switch on the first control panel 2 and set the heating temperature. After the cleaning liquid in the cleaning tank 16 reaches the set temperature, fully immerse the circuit board in the constant temperature cleaning liquid for a specified time;

[0036] 5) After the circuit board reaches the soaking time, open the compressed air valve 5 to adjust the compressed air flow in the bubbling tube 4 until bubbles are observed in the cleaning tank 16 and fill the liquid surface (too much bubbling will reduce the contact area and time between the cleaning liquid and the circuit board, affecting the cleaning effect), and perform the bubbling operation for the specified time;

[0037] 6) After the bubbling operation is completed, close the compressed air valve 5 and open the cylinder cover 10. Switch the switch 18 to the liquid storage tank 17 injection mode, and after the cleaning liquid is drawn into the liquid storage tank 17, close the filter circulation switch, take out the circuit board, adjust the height of the partition 21 in the cleaning basket 14 according to the size of the circuit board, or place the partition 21 to a suitable height, so that the circuit board is close to the spray arm 19, so that the circuit board can be deeply cleaned again by spraying the cleaning liquid, and then place the circuit board on the partition 21 and cover the cylinder cover 10;

[0038] 7) Turn on the second power switch on the second control panel 3 and set the heating temperature. After the cleaning liquid in the liquid storage tank 17 reaches the set temperature, turn on the spray switch on the second control panel 3;

[0039] 8) Confirm through the observation window on the cylinder head 10 that the spray system has started working, and after the spraying is completed within the prescribed time, turn off the spray switch and the second power switch, and turn off the first power switch at the same time;

[0040] 9) Open the cylinder cover 10 and take out the circuit board. This completes the circuit board cleaning process.

[0041] The above-mentioned embodiments only express one or several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A circuit board cleaning device, characterized in that: It includes a shell, a control device, a bubbling tube, a compressed air valve, a first heater, a second heater, a water pump, a cylinder cover and a height adjustment device. A cleaning tank and a liquid storage tank are arranged in the shell. The control device is installed on the outer wall of the shell. The control device is connected to the first heater and the second heater and is used to control the switches of the first heater and the second heater. The first heater is installed at the bottom of the cleaning tank, and the second heater is installed at the bottom of the liquid storage tank. One end of the bubbling tube passes through the outer wall of the shell and is connected to the compressed air valve, and the other end is arranged at the bottom of the cleaning tank. The water pump is installed in the shell, and the cylinder cover is arranged at the top of the cleaning tank. A spray device is arranged on the cylinder cover, and the water pump is connected to the spray device through a spray pipe. One end of the spray pipe connected to the water pump is located at the bottom of the liquid storage tank. The control device is connected to the water pump and is used to control the switch of the water pump. A height adjustment device is arranged in the cleaning tank, and the circuit board to be cleaned is placed on the height adjustment device. The height adjustment device is used to adjust the height of the circuit board to be cleaned in the cleaning tank.

2. The circuit board cleaning device according to claim 1, characterized in that: It also includes a filter pump, a filter, a filter tube and a switching switch, wherein the filter pump and the filter are installed in a shell, one end of the filter tube is located at the bottom of the cleaning tank, the filter tube is connected to the filter pump and the filter in sequence, and the other end is connected to the switching switch, the switching switch is also connected to a first switching tube and a second switching tube, the first switching tube is connected to the cleaning tank, and the second switching tube is connected to the liquid storage tank, the control device also includes a circulating filtering switch, and the circulating filtering switch is connected to the filter pump.

3. The circuit board cleaning device according to claim 1, characterized in that: The bubbling tube is located in the cleaning tank and has a plurality of small holes on its wall.

4. The circuit board cleaning device according to claim 1, characterized in that: The height adjustment device is a cleaning basket, and partition racks are arranged at different heights on the inner wall of the cleaning basket. The partition racks are used to place partitions, and the circuit boards to be cleaned are placed on the partitions.

5. The circuit board cleaning device according to claim 4, characterized in that: The cleaning basket is made of stainless steel.

6. The circuit board cleaning device according to claim 1, characterized in that: The cylinder cover is provided with an observation window.

7. The circuit board cleaning device according to claim 1, characterized in that: The utility model also comprises a drain valve, which is installed below the shell and connected to the cleaning tank through a drain pipe.

8. The circuit board cleaning device according to claim 1, characterized in that: The utility model also comprises four universal wheels, and the four universal wheels are installed at the bottom of the shell.

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