Overflow device and PCB immersion equipment

Abstract

The present application provides an overflow device and a PCB immersion device. The overflow device includes a liquid medicine tank, a liquid blocking plate, and an overflow assembly. The liquid medicine tank is provided with a liquid medicine groove, and the liquid medicine tank is used to provide liquid medicine for a water knife liquid passing device. The liquid blocking plate covers the liquid medicine tank, and the liquid blocking plate is formed with a plurality of overflow ports, and the overflow ports are used to allow the liquid medicine flowing out of the water knife liquid passing device to flow into the liquid medicine groove. The overflow assembly includes a plurality of overflow pipe bundles, each of the overflow pipe bundles is correspondingly arranged at one of the overflow ports, and each of the overflow pipe bundles is filled in one of the overflow ports so that each of the overflow pipe bundles is connected to the liquid blocking plate. The liquid inlet end of each of the overflow pipe bundles is communicated with the corresponding overflow port. Among them, the liquid supply amount of the liquid medicine tank is equal to the sum of the liquid overflow amounts of the plurality of overflow ports. The vertical distance between the liquid outlet end of each of the overflow pipe bundles and the bottom of the liquid medicine tank is less than or equal to the lowest liquid level of the liquid medicine tank.

Description

Technical Field

[0001] The present invention relates to the field of PCBs, and in particular to an immersion overflow tank and a PCB immersion device. Background Art

[0002] In the PCB horizontal production line, immersion circulation treatment is a common chemical solution treatment method (including immersion water jet circulation and immersion ultrasonic treatment). Secondly, there is also spray treatment. The biggest difference between the two is that the liquid level of the chemical solution in the immersion circulation treatment at the plate passing position remains at a certain height continuously, while after the chemical solution in the spray treatment is ejected from the nozzle, it does not need to be temporarily stored in the tank and directly falls into the tank. According to the characteristics of the chemical solution, some chemical solutions that require low bubbles are not suitable for spray treatment, and immersion water jet circulation is the only option.

[0003] However, in the traditional overflow device, the overflow channel is designed as a slope, so that the upper liquid medicine overflows and falls back into the tank through the slope. Due to the impact force when the liquid medicine falls, bubbles will be generated in the liquid medicine. After the liquid medicine solution containing bubbles is stirred by the filter pump, tiny bubbles will be formed and mixed in the solution, resulting in poor local exchange of the liquid medicine on the plate surface, thereby leading to poor product quality of the PCB board. Summary of the Invention

[0004] An object of the present invention is to overcome the deficiencies in the prior art and provide an overflow device and a PCB immersion device that can eliminate the generation of bubbles.

[0005] The object of the present invention is achieved by the following technical solutions:

[0006] An overflow device, comprising:

[0007] A liquid medicine tank, the liquid medicine tank is provided with a liquid medicine tank, and the liquid medicine tank is used to provide liquid medicine for the water jet liquid passing device;

[0008] A liquid retaining plate, the liquid retaining plate covers the liquid medicine tank, and the liquid retaining plate is formed with a plurality of overflow ports, and the overflow ports are used to make the liquid medicine flowing out of the water jet liquid passing device flow into the liquid medicine tank;

[0009] An overflow assembly, the overflow assembly includes a plurality of overflow pipe bundles, each of the overflow pipe bundles is correspondingly arranged at one of the overflow ports, each of the overflow pipe bundles is filled in one of the overflow ports, so that each of the overflow pipe bundles is connected to the liquid retaining plate, and the liquid inlet end of each of the overflow pipe bundles is communicated with the corresponding overflow port;

[0010] Wherein, the liquid supply amount of the liquid medicine tank is equal to the total sum of the liquid medicine overflow amounts of the plurality of overflow ports;

[0011] The vertical distance between the liquid outlet end of each of the overflow pipe bundles and the bottom of the liquid medicine tank should be less than or equal to the lowest liquid level of the liquid medicine tank.

[0012] In one embodiment, each of the overflow pipe bundles includes a plurality of overflow through pipes, the plurality of overflow through pipes are filled in an overflow port, and the liquid inlet ports of the plurality of overflow through pipes are all communicated with an overflow port.

[0013] In one embodiment, the vertical distance between the liquid outlet of each of the overflow through pipes and the bottom of the liquid medicine tank should be less than or equal to the lowest liquid level of the liquid medicine tank.

[0014] In one embodiment, the liquid supply speed of the liquid medicine tank is equal to the sum of the overflow speeds of the plurality of overflow ports.

[0015] In one embodiment, the overflow area of each of the overflow ports is the same.

[0016] In one embodiment, the overflow area of each of the overflow pipe bundles is the same.

[0017] In one embodiment, the number of the overflow through pipes corresponding to each of the overflow ports is the same.

[0018] In one embodiment, the overflow area of each of the overflow through pipes is the same.

[0019] In one embodiment, the overflow through pipe is a PE pipe or a Teflon pipe.

[0020] A PCB immersion device includes a water knife liquid passing device and the overflow device described in any of the above embodiments, and the water knife liquid passing device is communicated with the liquid medicine tank.

[0021] Compared with the prior art, the present invention has at least the following advantages:

[0022] For the overflow device of the present application, by forming a plurality of overflow ports on the liquid blocking plate, the liquid medicine flowing out of the water knife liquid passing device can flow back to the liquid medicine tank through the overflow ports. Also, since the liquid medicine tank supplies the liquid medicine to the water knife liquid passing device, and in order to ensure the normal use of the water knife liquid passing device, by setting the liquid supply of the liquid medicine tank to be equal to the sum of the liquid medicine overflow amounts of the plurality of overflow ports, the liquid medicine in the liquid medicine tank is kept in dynamic balance. At the same time, each overflow pipe bundle is correspondingly arranged at an overflow port, and each overflow pipe bundle is filled in an overflow port, so that the liquid medicine flows back through the overflow pipe bundle. Using the overflow pipe bundle can increase the contact surface area between the liquid medicine during the reflux process and the pipe. Relying on the wetting force of the liquid medicine itself, the liquid medicine can flow back slowly, thus effectively avoiding the generation of liquid medicine bubbles, and further avoiding the occurrence of the situation where tiny bubbles are adsorbed on the PCB board surface and cause poor local exchange of the liquid medicine on the board surface, and further effectively improving the product quality of the PCB board. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a structural plan view of the PCB immersion equipment in one embodiment;

[0025] Figure 2 It is Figure 1 the structural top view of the PCB immersion equipment shown;

[0026] Figure 3 It is Figure 2 the partial structural schematic diagram of the PCB immersion equipment shown;

[0027] Figure 4 It is Figure 1 the partial structural schematic diagram of the PCB immersion equipment shown;

[0028] Figure 5 It is Figure 2 the partial structural schematic diagram of the PCB immersion equipment shown;

[0029] Figure 6 It is Figure 2 the partial structural schematic diagram of the PCB immersion equipment shown;

[0030] Figure 7 It is the structural top view of the PCB immersion equipment in another embodiment;

[0031] Figure 8 It is Figure 7 the partial structural schematic diagram of the PCB immersion equipment shown;

[0032] Figure 9 It is the structural top view of the PCB immersion equipment in another embodiment;

[0033] Figure 10 It is Figure 9 the partial structural schematic diagram of the PCB immersion equipment shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0037] The overflow device and the PCB immersion device provided by the present application, the above-mentioned overflow device includes a liquid medicine tank, a liquid blocking plate and an overflow assembly. The liquid medicine tank is provided with a liquid medicine tank, and the liquid medicine tank is used to provide liquid medicine for the water knife liquid passing device. The liquid blocking plate covers the liquid medicine tank, and the liquid blocking plate is formed with a plurality of overflow ports, and the overflow ports are used to make the liquid medicine flowing out of the water knife liquid passing device flow into the liquid medicine tank. The overflow assembly includes a plurality of overflow pipe bundles, each of the overflow pipe bundles is correspondingly arranged at one of the overflow ports, and each of the overflow pipe bundles is filled in one of the overflow ports so that each of the overflow pipe bundles is connected to the liquid blocking plate, and the liquid inlet end of each of the overflow pipe bundles is communicated with the corresponding overflow port. Among them, the liquid supply amount of the liquid medicine tank is equal to the total sum of the liquid overflow amounts of the plurality of overflow ports. The vertical distance between the liquid outlet end of each overflow pipe bundle and the bottom of the liquid medicine tank is less than or equal to the lowest liquid level of the liquid medicine tank.

[0038] Please refer to Figures 1 to 3 , in order to better understand the overflow device 20 of the present application, the following further explanatory description is made on the overflow device 20:

[0039] The overflow device 20 of an embodiment includes a liquid medicine tank 100, a liquid blocking plate 200, and an overflow assembly 300. The liquid medicine tank 100 is provided with a liquid medicine tank 102, and the liquid medicine tank 100 is used to provide liquid medicine for the water jet liquid passing device 400. The liquid blocking plate 200 covers the liquid medicine tank 100, and the liquid blocking plate 200 is formed with a plurality of overflow ports 202. The overflow ports 202 are used to allow the liquid medicine flowing out of the water jet liquid passing device 400 to flow into the liquid medicine tank 102. The overflow assembly 300 includes a plurality of overflow pipe bundles 310. Each overflow pipe bundle 310 is correspondingly arranged at one overflow port 202, and each overflow pipe bundle 310 is filled in one overflow port 202 so that each overflow pipe bundle 310 is connected to the liquid blocking plate 200. The liquid inlet end of each overflow pipe bundle 310 is communicated with the corresponding overflow port 202. Among them, the liquid supply amount of the liquid medicine tank 100 is equal to the sum of the liquid overflow amounts of the plurality of overflow ports 202. The vertical distance between the liquid outlet end of each overflow pipe bundle 310 and the bottom of the liquid medicine tank 100 is less than or equal to the lowest liquid level of the liquid medicine tank 100.

[0040] In this embodiment, by forming a plurality of overflow ports 202 on the liquid blocking plate 200, the liquid medicine flowing out of the water jet liquid passing device 400 can flow back to the liquid medicine tank 102 through the overflow ports 202. Also, since the liquid medicine tank 100 provides liquid medicine for the water jet liquid passing device 400, and in order to ensure the normal use of the water jet liquid passing device 400, by setting the liquid supply of the liquid medicine tank 100 to be equal to the sum of the liquid overflow amounts of the plurality of overflow ports 202, the liquid medicine in the liquid medicine tank 100 is kept in dynamic balance. At the same time, each overflow pipe bundle 310 is correspondingly arranged at one overflow port 202, and each overflow pipe bundle 310 is filled in one overflow port 202, so that the liquid medicine flows back through the overflow pipe bundle 310. Using the overflow pipe bundle 310 can increase the contact surface area between the liquid medicine reflux process and the pipeline. Relying on the wetting force of the liquid medicine itself, the liquid medicine can flow back slowly, effectively avoiding the generation of liquid medicine bubbles, and further avoiding the situation where tiny bubbles are adsorbed on the PCB board surface, resulting in poor local exchange of the liquid medicine on the board surface. Thus, the product quality of the PCB board is effectively improved.

[0041] It should be particularly noted that since the liquid medicine tank 100 is also provided with a heating pipe, the liquid medicine tank 100 needs to be set with a lowest liquid level to ensure that the liquid medicine can submerge the heating pipe.

[0042] Such as Figures 1 to 3As shown, in one embodiment, each of the overflow pipe bundles 310 includes a plurality of overflow through pipes 3110. The plurality of overflow through pipes 3110 are filled in an overflow port 202, and the liquid inlets of the plurality of overflow through pipes 3110 are all communicated with an overflow port 202. It can be understood that the overflow pipe bundle 310 is composed of a plurality of overflow through pipes 3110, and the plurality of overflow through pipes 3110 are filled in an overflow port 202, which can effectively increase the contact surface area between the liquid medicine and the pipe. Then, through the wetting force of the liquid medicine itself, the liquid medicine can achieve a slow descent, which can largely avoid the generation of bubbles in the reflux liquid medicine, thereby effectively improving the product quality of the PCB board.

[0043] As Figures 1 to 3 shown, in one embodiment, the vertical distance between the liquid outlet of each overflow through pipe 3110 and the bottom of the liquid medicine tank 100 is less than or equal to the lowest liquid level of the liquid medicine tank 100. It should be noted that by setting the vertical distance between the liquid outlet of each overflow through pipe 3110 and the bottom of the liquid medicine tank 100 to be less than or equal to the lowest liquid level of the liquid medicine tank 100, it is ensured that each overflow through pipe 3110 is immersed in the liquid medicine in the liquid medicine tank 100. Therefore, when the reflux liquid medicine realizes a slow descent, it is in flexible contact with the liquid medicine in the liquid medicine tank 100, which can effectively avoid the situation that the reflux liquid medicine directly impacts the liquid medicine in the liquid medicine tank 100 and generates bubbles, thereby avoiding the generation of bubbles in the liquid medicine, and further avoiding the occurrence of poor local exchange between the liquid medicine and the board surface, and further improving the product quality of the PCB board.

[0044] As Figures 1 to 3 shown, in one embodiment, the liquid supply speed of the liquid medicine tank 100 is equal to the sum of the overflow speeds of the plurality of overflow ports 202. It should be noted that the liquid supply speed and the overflow speed refer to the liquid medicine flow rate per unit time, that is, while the liquid medicine tank 100 supplies liquid, there is also liquid medicine flowing back to ensure that the liquid medicine volume in the liquid medicine tank 100 remains in dynamic balance, so as to avoid the situation that the liquid medicine cannot immerse each overflow through pipe 3110, and can largely avoid the situation that the reflux liquid medicine is in rigid contact with the liquid medicine in the liquid medicine tank 100 and generates bubbles, thereby effectively avoiding the generation of bubbles in the liquid medicine, and further effectively avoiding the occurrence of poor local exchange between the liquid medicine and the board surface, and further improving the product quality of the PCB board.

[0045] As Figure 2 and Figure 3As shown, in one embodiment, the overflow area of each of the overflow ports 202 is the same. It should be noted that since the overflow direction of the water jet liquid passing device 400 is irregular, in order to ensure that the liquid supply speed of the liquid medicine tank 100 is equal to the sum of the overflow speeds of the plurality of overflow ports 202, the overflow area of each overflow port 202 is the same, that is, the size of each overflow port 202 is kept consistent, which is convenient for controlling the liquid supply amount and the overflow amount to be consistent, so that the liquid medicine in the liquid medicine tank 100 maintains a dynamic balance.

[0046] As Figure 2 and Figure 3 As shown, in one embodiment, the overflow area of each of the overflow pipe bundles 310 is the same. It can be understood that since the overflow area of each overflow port 202 is the same and each overflow pipe bundle 310 is filled in an overflow port 202, the overflow area of each overflow pipe bundle 310 is the same to ensure that the liquid supply amount and the overflow amount are consistent.

[0047] As Figure 2 and Figure 3 As shown, in one embodiment, the number of the overflow through pipes 3110 corresponding to each of the overflow ports 202 is the same. It can be understood that the overflow pipe bundle 310 is composed of a plurality of identical overflow through pipes 3110, and the overflow area of each overflow pipe bundle 310 is consistent, so that the number of the overflow through pipes 3110 of each overflow pipe bundle 310 is the same. Therefore, the number of the overflow through pipes 3110 corresponding to each overflow port 202 is the same. By providing a plurality of through pipes, the contact surface area between the reflux liquid medicine and the pipe can be increased, so as to realize the slow descent of the liquid medicine, thereby avoiding the generation of bubbles and further improving the product quality of the PCB board.

[0048] As Figure 2 and Figure 3 As shown, in one embodiment, the overflow area of each of the overflow through pipes 3110 is the same. It can be understood that the plurality of overflow through pipes 3110 are the same, so the overflow area of each overflow through pipe 3110 is the same.

[0049] As Figure 3 As shown, in one embodiment, the overflow through pipe 3110 is a PE pipe or a Teflon pipe. It should be noted that since the liquid medicine is corrosive and the corrosion resistance of PE material and Teflon material is better, using PE or Teflon material as the production material of the overflow through pipe 3110 can greatly enhance the corrosion resistance of the overflow through pipe 3110, thereby effectively improving the structural stability and service life of the overflow through pipe 3110.

[0050] It can be understood that, as Figures 7 to 8, since the overflow port 202 is a circular port and the overflow through-pipe 3110 is also a circular pipe orifice, when multiple overflow through-pipes 3110 are bundled to form the overflow pipeline bundle 310, there are gaps between the circular orifice overflow through-pipes 3110 and there is also a gap between the overflow pipeline bundle 310 and the overflow port 202, causing the refluxed liquid medicine to directly flow into the liquid medicine tank 100 through the gaps, which easily results in the situation where the refluxed liquid medicine rigidly contacts the liquid medicine in the liquid medicine tank 100 and generates bubbles. Therefore, in this embodiment, the overflow port 202 is a rectangular port and the overflow through-pipe 3110 is a rectangular pipe orifice. Multiple overflow through-pipes 3110 are bundled side by side to form the overflow pipeline bundle 310. The multiple overflow through-pipes 3110 are closely arranged and filled in the overflow port 202, so that the gaps between the overflow through-pipes 3110 disappear, and the gap between the overflow pipeline bundle 310 and the overflow port 202 also disappears, thus effectively avoiding the situation where the refluxed liquid medicine rigidly contacts the liquid medicine in the liquid medicine tank 100 and generates bubbles, and further effectively avoiding the generation of bubbles in the liquid medicine, and further improving the product quality of the PCB board.

[0051] Further, as Figure 9 and Figure 10 , since the overflow pipeline bundle 310 is to be filled in the overflow port 202 and for the convenience of installing the overflow pipeline bundle 310, in this embodiment, the liquid baffle 200 is formed with a plurality of trapezoidal avoidance grooves 204, and each trapezoidal avoidance groove 204 communicates with an overflow port 202. That is, each overflow port 202 is opened on the bottom of a trapezoidal avoidance groove 204. By providing the trapezoidal avoidance grooves 204, it is not only convenient to install the overflow pipeline bundle 310, but also the trapezoidal grooves do not affect the reflux of the liquid medicine.

[0052] Further, a plurality of clamping grooves are formed on the periphery of each overflow port, and a fastener is provided on each of the outermost overflow through-pipes of each overflow pipeline bundle. Each fastener is buckled with a clamping groove so that each overflow pipeline bundle is buckled and connected to the liquid baffle. By providing that each overflow pipeline bundle is buckled and connected to the liquid baffle, the connection stability between the overflow pipeline bundle and the liquid baffle can be greatly improved, so that the situation where the overflow pipeline bundle falls off during use can be avoided, thus effectively avoiding the situation where the refluxed liquid medicine rigidly contacts the liquid medicine in the liquid medicine tank and generates bubbles, and further effectively improving the product quality of the PCB board. Further, each fastener is formed with a handle ring. By forming a handle ring on the fastener, when replacing the overflow pipeline bundle, it only needs to be lifted through the handle ring, which is convenient for the quick replacement of the overflow pipeline bundle, and can effectively improve the convenience of use of the overflow device, thus effectively improving the production efficiency of the PCB board.

[0053] The present application also provides a PCB immersion device, including a water knife liquid passing device 400 and the overflow device 20 described in any of the above embodiments, and the water knife liquid passing device 400 communicates with the liquid medicine tank 100.

[0054] In this embodiment, a plurality of overflow ports 202 are formed on the liquid baffle 200, so that the liquid medicine flowing out of the water jet liquid passing device 400 can flow back to the liquid medicine tank 102 through the overflow ports 202. Also, since the liquid medicine cylinder 100 supplies the liquid medicine to the water jet liquid passing device 400, and to ensure the normal use of the water jet liquid passing device 400, by setting the sum of the liquid supply of the liquid medicine cylinder 100 and the liquid overflow amount of the plurality of overflow ports 202 to be equal, the liquid medicine in the liquid medicine cylinder 100 is kept in dynamic balance. At the same time, each overflow pipe bundle 310 is correspondingly arranged at an overflow port 202, and each overflow pipe bundle 310 is filled in an overflow port 202, so that the liquid medicine flows back through the overflow pipe bundle 310. Using the overflow pipe bundle 310 can increase the contact surface area between the liquid medicine during the reflux process and the pipe. Relying on the wetting force of the liquid medicine itself, the slow reflux of the liquid medicine can be realized, thus effectively avoiding the generation of liquid medicine bubbles, and further avoiding the situation of poor local exchange of the liquid medicine on the PCB board surface caused by the adsorption of micro-bubbles on the PCB board surface, and effectively improving the product quality of the PCB board.

[0055] It should also be noted that, as Figures 4 to 6 shown, the water jet liquid passing device 400 includes a bracket 410, a roller conveyor assembly 420 and a water jet assembly 430. The bracket 410 is connected to the liquid baffle 200. The roller conveyor assembly 420 includes a conveyor frame 4210, an upper roller conveyor belt 4220 and a lower roller conveyor belt 4230. The conveyor frame 4210 is connected to the liquid baffle 200. Both the upper roller conveyor belt 4220 and the lower roller conveyor belt 4230 are rotatably connected to the conveyor frame 4210. A conveying channel is formed between the upper roller conveyor belt 4220 and the lower roller conveyor belt 4230 for conveying the PCB board. The jetting direction of the water jet assembly 430 is set towards both sides of the conveying channel, so that the water jet assembly 430 can perform jetting operations on both sides of the PCB board.

[0056] Furthermore, the PCB immersion device further includes a driving device and a liquid pumping device. The driving device is used to rotate the upper roller conveyor belt and the lower roller conveyor belt. The liquid outlet end of the liquid pumping device is communicated with the liquid inlet end of the water jet assembly, and the liquid inlet end of the liquid pumping device is communicated with the liquid medicine cylinder. Through the driving device, the upper roller conveyor belt and the lower roller conveyor belt can transport the PCB board, and then through the liquid pumping device, the liquid medicine in the liquid medicine cylinder is transported to the water jet assembly to supply liquid medicine to the water jet assembly.

[0057] Furthermore, as Figures 4 to 6, the upper roller conveyor belt 4220 includes a plurality of first roller groups 4221 arranged in sequence, the lower roller conveyor belt 4230 includes a plurality of second roller groups 4231 arranged in sequence, a first water knife installation position is formed every three first roller groups 4221, so that the upper roller conveyor belt 4220 is formed with a plurality of first water knife installation positions, and a second water knife installation position is formed every three second roller groups 4231, so that the upper roller conveyor belt 4220 is formed with a plurality of second water knife installation positions. The water knife assembly 430 includes a plurality of first water knife members 4310, a plurality of second water knife members 4320, a plurality of third water knife members 4330 and a plurality of fourth water knife members 4340. The plurality of first water knife members 4310 are respectively installed on the first water knife installation positions, and the plurality of second water knife members 4320 are respectively installed on the second water knife installation positions, so that the plurality of first water knife members 4310 and the plurality of second water knife members 4320 are both connected to the conveying bracket 410. The plurality of third water knife members 4330 are installed at one end of the bracket 410, and the plurality of third water knife members 4330 are arranged at intervals directly above the upper roller conveyor belt 4220. The plurality of fourth water knife members 4340 are installed at the other end of the bracket 410 and the plurality of fourth water knife members 4340 are arranged at intervals directly below the lower roller conveyor belt 4230. The spraying directions of the plurality of first water knife members 4310 and the plurality of third water knife members 4330 are set downward, so as to perform a spraying operation on the first surface of the PCB board on the conveying channel. The spraying directions of the plurality of second water knife members 4320 and the plurality of fourth water knife members 4340 are set upward, so as to perform a spraying operation on the second surface of the PCB board on the conveying channel. The first surface of the PCB board is directly sprayed by a plurality of first water knife members 4310 arranged at intervals to ensure that the first surface of the PCB board is immersed in the liquid medicine. Since part of the liquid medicine will be taken away by the rotation of the rollers when the PCB board is conveyed on the rollers, at this time, the plurality of third water knife members 4330 arranged at intervals directly spray the first surface of the PCB board through the gaps between the rollers of the upper roller conveyor belt 4220, which not only plays a role in compensating the liquid medicine, but also continuously changes the liquid medicine on the first surface of the PCB board, so that the first surface of the PCB board is constantly in contact with the liquid medicine. Similarly, the first surface of the PCB board is directly sprayed by a plurality of first water knife members 4310 arranged at intervals to ensure that the first surface of the PCB board is immersed in the liquid medicine. Since part of the liquid medicine will be taken away by the rotation of the rollers when the PCB board is conveyed on the rollers, at this time, the plurality of third water knife members 4330 arranged at intervals directly spray the second surface of the PCB board through the gaps between the rollers of the upper roller conveyor belt 4220, which not only plays a role in compensating the liquid medicine, but also continuously changes the liquid medicine on the second surface of the PCB board, so that the second surface of the PCB board is constantly in contact with the liquid medicine. This makes the local exchange of the liquid medicine on the PCB board surface better, thus effectively improving the product quality of the PCB board.

[0058] Compared with the prior art, the present invention has at least the following advantages:

[0059] For the overflow device of the present application, a plurality of overflow ports are formed on the liquid baffle, so that the liquid medicine flowing out of the water jet liquid passing device can flow back to the liquid medicine tank through the overflow ports. Also, since the liquid medicine cylinder supplies the liquid medicine to the water jet liquid passing device, and in order to ensure the normal use of the water jet liquid passing device, by setting the liquid supply of the liquid medicine cylinder to be equal to the total liquid overflow amount of the plurality of overflow ports, the liquid medicine in the liquid medicine cylinder is kept in dynamic balance. At the same time, each overflow pipe bundle is correspondingly arranged at an overflow port, and each overflow pipe bundle is filled in an overflow port, so that the liquid medicine flows back through the overflow pipe bundle. Using the overflow pipe bundle can increase the contact surface area between the liquid medicine during the reflux process and the pipe. Relying on the wetting force of the liquid medicine itself, the slow reflux of the liquid medicine can be realized, thereby effectively avoiding the generation of liquid medicine bubbles, and further avoiding the situation that tiny bubbles are adsorbed on the PCB board surface and cause poor local exchange of the liquid medicine on the board surface, and further effectively improving the product quality of the PCB board.

[0060] The above embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims.

Claims

1. An overflow device, characterized in that, Comprising: A liquid medicine tank, the liquid medicine tank is provided with a liquid medicine groove, and the liquid medicine tank is used to provide liquid medicine for a water jet liquid passing device; A liquid blocking plate, the liquid blocking plate covers the liquid medicine tank, the liquid blocking plate is formed with a plurality of overflow ports, and the overflow ports are used to make the liquid medicine flowing out of the water jet liquid passing device flow into the liquid medicine groove; An overflow assembly, the overflow assembly includes a plurality of overflow pipe bundles, each overflow pipe bundle is correspondingly arranged at one overflow port, each overflow pipe bundle is filled in one overflow port, so that each overflow pipe bundle is connected to the liquid blocking plate, and the liquid inlet end of each overflow pipe bundle is communicated with the corresponding overflow port; Wherein, the liquid supply amount of the liquid medicine tank is equal to the sum of the liquid overflow amounts of the plurality of overflow ports; The vertical distance from the liquid outlet end of each overflow pipe bundle to the bottom of the liquid medicine tank is less than or equal to the lowest liquid level of the liquid medicine tank; Each overflow pipe bundle includes a plurality of overflow through pipes, the plurality of overflow through pipes are filled in one overflow port, and the liquid inlet ports of the plurality of overflow through pipes are all communicated with one overflow port; The vertical distance from the liquid outlet port of each overflow through pipe to the bottom of the liquid medicine tank is less than or equal to the lowest liquid level of the liquid medicine tank; The liquid supply speed of the liquid medicine tank is equal to the sum of the overflow speeds of the plurality of overflow ports; The overflow area of each overflow port is the same; The overflow through pipe is a PE pipe or a Teflon pipe; The overflow port is a rectangular port and the overflow through pipe is a rectangular pipe orifice, and the plurality of overflow through pipes are bundled side by side to form the overflow pipe bundle, and the plurality of overflow through pipes are closely arranged and filled in the overflow port; The liquid blocking plate is formed with a plurality of trapezoidal avoidance grooves, and each trapezoidal avoidance groove is communicated with one overflow port; A plurality of clamping grooves are formed on the periphery of each overflow port, and fasteners are provided on the outermost circle of the plurality of overflow through pipes of each overflow pipe bundle, and each fastener is clamped with one clamping groove, so that each overflow pipe bundle is snap-connected to the liquid blocking plate; Each fastener is formed with a handle ring.

2. The overflow device according to claim 1, wherein The overflow area of each overflow pipe bundle is the same.

3. The overflow device according to claim 2, characterized in that, The number of overflow through pipes corresponding to each overflow port is the same.

4. The overflow device according to claim 3, characterized in that, The overflow area of each overflow through pipe is the same.

5. A PCB immersion device, characterized in that, Including a water jet liquid passing device and the overflow device according to any one of claims 1-4, and the water jet liquid passing device is communicated with the liquid medicine tank.

Images