A PCB electronic component welding device

Abstract

The invention relates to the technical field of PCB welding equipment, and discloses a PCB electronic component welding device, comprising a frame, a welding gun arranged at the top of the inner cavity of the frame, and a fixing assembly for fixing the PCB, wherein the fixing assembly comprises two symmetrically arranged guide rails, two symmetrically arranged fixing frames are arranged between the two guide rails, and the frame of the fixing frame is a hollow structure; the invention arranges a supporting cylinder, a rotating column and an infusion channel, so that no matter how the rotating column rotates, oil with a higher temperature is always input into the fixing frame located at the top, and oil with a lower temperature is always input into the fixing frame located at the bottom, so that the temperature of the PCB is adjusted by a temperature regulating plate, so that the top surface of the PCB maintains a suitable welding temperature, and the bottom surface temperature is low to accelerate the solidification of solder, thereby reducing the decrease in the firmness of solder joints and the shedding of components due to excessively high temperature, thereby improving the reliability of the product.

Description

Technical Field

[0001] The invention relates to the technical field of PCB board welding equipment, in particular to a PCB board electronic component welding device. Background Art

[0002] PCB electronic component welding equipment is the core equipment in electronic manufacturing. It is used to fix electronic components on PCB boards to ensure the transmission of electronic signals and the realization of circuit functions. Welding equipment is mainly divided into two categories: manual welding tools and automated welding equipment. Manual welding tools are simple and easy to operate, suitable for sample production or small batch production; automated welding equipment such as reflow ovens and wave soldering machines are suitable for large-scale production, which can increase output and ensure the consistency of welding quality. In short, choosing the right welding equipment is crucial to improving production efficiency and ensuring product quality.

[0003] Chinese patent CN116900577B discloses a double-sided welding device and method for computer PCB boards, which belongs to the field of welding technology, including a mounting bracket, a PCB board feeding and transporting assembly cooperating with one side of the mounting bracket, a PCB board discharging and transporting assembly cooperating with the other side of the mounting bracket, a PCB board grabbing assembly, a PCB board flipping assembly, a PCB board welding assembly and a component transporting and picking assembly are all fixedly arranged on the mounting bracket, and the PCB board feeding and transporting assembly, the PCB board discharging and transporting assembly and the PCB board flipping assembly are all cooperating with the PCB board grabbing assembly, and the PCB board welding assembly and the component transporting and picking assembly are all cooperating with the PCB board flipping assembly. The structure of the whole equipment is compact, and can realize double-sided welding of computer PCB boards. Compared with the production line, the equipment occupies a small area and can be processed in a small dust-free workshop, which reduces the maintenance cost of the workshop and also reduces the investment cost of the equipment.

[0004] As shown in the above patent, in order to improve welding efficiency, the PCB board can be flipped by a flip assembly to achieve double-sided welding. However, in the process of using the flip assembly to achieve double-sided welding of the PCB board, a significant problem is that after the PCB board is flipped, the electronic components may fall off under the influence of their own gravity because the solder has not yet completely solidified. In addition, when welding the other side of the PCB board, the high temperature introduced may increase the temperature of the solder on the welded side, thereby affecting the firmness of the solder joint and increasing the risk of electronic components falling off. The problem of component falling off and reduced solder joint quality during this welding process has a serious impact on welding efficiency and product reliability.

[0005] Therefore, it is necessary to provide a PCB board electronic component welding device to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a PCB electronic component welding device, so that the top surface of the PCB board maintains a suitable welding temperature, the bottom surface temperature is relatively low to accelerate the solidification of the solder, and the decrease in the firmness of the solder joints and the falling off of components caused by excessively high temperature are reduced.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a PCB electronic component welding device, comprising a frame, a welding gun arranged at the top of the frame inner cavity and a fixing assembly for fixing the PCB, the fixing assembly comprising two symmetrically arranged guide rails, two symmetrically arranged fixing frames are arranged between the two guide rails, the frame of the fixing frame is a hollow structure, a temperature regulating plate is fixedly installed inside the two fixing frames, the two temperature regulating plates are respectively fitted with two sides of the PCB board installed between the two fixing frames, and a plurality of through grooves are opened on the temperature regulating plate;

[0008] The cam is connected to the frame by a pair of locking plates, the pair of locking plates having a lock on the sidewall of the cam and a lock on the sidewall of the cam.

[0009] The present invention is further configured as follows: the connecting component includes a telescopic tube, a first connecting port and a first infusion tube, the slide seat is hollow, the inner cavity of the slide seat is connected to the inner cavity of the fixed frame, one end of the telescopic tube is connected to the slide seat, the other end of the telescopic tube is connected to the first connecting port, the first connecting port is arranged at the end of the guide rail, one end of the first infusion tube is connected to the first connecting port, and the other end of the first infusion tube is connected to the infusion channel.

[0010] The present invention is further configured as follows: a spring is sleeved on the telescopic tube, one end of the spring is connected to the slide seat, the other end of the spring is connected to the end of the guide rail, a partition is fixedly installed in the middle of the guide rail, and the partition is located between the two slide seats.

[0011] The present invention is further configured as follows: a first electric push rod is fixedly installed at the bottom of the inner cavity of the frame, a lifting seat is fixedly installed at the output end of the first electric push rod, an elastic support pad is fixedly installed at the top of the lifting seat, and the elastic support pad is provided with a plurality of grooves adapted to the electronic components welded on the PCB board.

[0012] The present invention is further configured as follows: the heating component includes a hot liquid tank, the cooling component includes a cold liquid tank, and the four second connecting ports are all connected with second infusion tubes, two of which are respectively connected with the two sides of the hot liquid tank, and the other two second infusion tubes are respectively connected with the two sides of the cold liquid tank, and infusion components for conveying oil are provided on both sides of the hot liquid tank.

[0013] The present invention is further configured as follows: the infusion assembly includes a cylinder, a piston, a plug rod and a third infusion tube, the two cylinders are respectively fixedly installed on both sides of the hot liquid tank, the piston is slidably installed in the inside of the cylinder, the top of the piston is fixedly connected with a tension spring, the top of the tension spring is fixedly connected to the top wall of the cylinder, the plug rod is fixedly installed on the top of the piston, and the top of the plug rod passes through the top wall of the cylinder, and two third connecting ports are provided at the bottom end of the cylinder, one of the third connecting ports is connected to the second infusion tube on one side, and the other third connecting port is connected to the third infusion tube, one of the third infusion tubes is connected to the hot liquid tank, and the other third infusion tube is connected to the cold liquid tank, and one-way valves are provided in the two third connecting ports, and the two one-way valves are set in opposite directions.

[0014] The present invention is further configured as follows: push plates are fixedly mounted on both sides of the lifting seat, and the two push plates are respectively arranged directly above the two plug rods.

[0015] The present invention is further configured as follows: a thermostat is arranged between the hot liquid tank and the cold liquid tank, the thermostat comprises a mounting frame, a semiconductor refrigeration sheet is embedded and installed inside the mounting frame, a heat release surface of the semiconductor refrigeration sheet is in contact with the bottom wall of the hot liquid tank, and a heat absorption surface of the semiconductor refrigeration sheet is in contact with the top wall of the cold liquid tank.

[0016] The present invention is further configured as follows: the driving assembly includes a second electric push rod, a rack and a gear, the gear is fixedly sleeved on one of the rotating columns, the top end of the second electric push rod is fixedly connected to the frame, the output end of the second electric push rod is fixedly mounted with a rack, and the rack is meshed with the gear.

[0017] In summary, the present invention has the following beneficial effects: the present invention arranges the support cylinder, the rotating column and the infusion channel so that no matter how the rotating column rotates, the oil with a higher temperature is always input into the fixed frame located above, and the oil with a lower temperature is always input into the fixed frame located below, so that the temperature of the PCB board is adjusted by the temperature regulating plate, so that the top surface of the PCB board maintains a suitable welding temperature, and the bottom surface temperature is relatively low to accelerate the solidification of the solder, thereby reducing the decrease in the firmness of the solder joints and the falling off of components due to excessive temperature, thereby improving the reliability of the product; the lifting and lowering of the lifting seat drives the plug rod and the piston to work, thereby realizing timely delivery of the oil, ensuring that the heating component and the cooling component work only when the PCB board is turned over and is in a horizontal state, and improving the synchronization and accuracy of the system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the main structure of the present invention; Figure 3 It is a schematic diagram of the structure of the fixing assembly and the driving assembly of the present invention; Figure 4 It is a schematic cross-sectional structural diagram of the guide rail, the support cylinder and the rotating column of the present invention; Figure 5 It is a structural schematic diagram of the fixing frame and the temperature regulating plate of the present invention; Figure 6 It is a schematic diagram of the structure of the heating component and the cooling component of the present invention; Figure 7 is a schematic cross-sectional structure diagram of the infusion assembly of the present invention; Figure 8 It is a structural schematic diagram of the thermostat of the present invention.

[0019] In the figure: 1, frame; 2, support cylinder; 201, connecting hole; 3, rotating column; 301, infusion channel; 4, guide rail; 5, slide seat; 6, partition; 7, fixed frame; 8, temperature control plate; 801, through groove; 9, telescopic tube; 10, spring; 11, first connection port; 12, first infusion tube; 13, second connection port; 19, welding gun; 20, second infusion tube; 21, cold liquid tank; 22, hot liquid tank; 23 , thermostat; 231, mounting bracket; 232, semiconductor refrigeration plate; 24, infusion assembly; 241, cylinder; 242, piston; 243, plug rod; 244, tension spring; 245, third infusion tube; 246, third connection port; 247, one-way valve; 25, first electric push rod; 26, lifting seat; 27, elastic support pad; 28, push plate; 29, gear; 30, rack; 31, second electric push rod. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention.

[0021] See also Figures 1 to 6In an embodiment of the present invention, a PCB electronic component welding device includes a frame 1, a welding gun 19 arranged at the top of the inner cavity of the frame 1, and a fixing assembly for fixing the PCB board. The welding gun 19 can be moved arbitrarily in the horizontal and vertical directions. The fixing assembly includes two symmetrically arranged guide rails 4, and two symmetrically arranged fixing frames 7 are arranged between the two guide rails 4. The frame of the fixing frame 7 is a hollow structure. The two fixing frames 7 are fixedly installed with temperature regulating plates 8 inside. The two temperature regulating plates 8 are respectively fitted with two sides of the PCB board installed between the two fixing frames 7. The temperature regulating plates 8 are respectively fitted with two sides of the PCB board installed between the two fixing frames 7. The plate 8 is provided with a plurality of through slots 801, which are adapted to the electronic components to be soldered, so that the electronic components can be soldered on the PCB board from the position of the through slots 801. The temperature regulating plate 8 is made of a material with a high thermal conductivity, such as copper. Slide seats 5 are fixedly installed on both sides of the two fixed frames 7. The slide seats 5 are slidably installed in the guide rail 4. A rotating column 3 is fixedly installed on one side of the guide rail 4. A support cylinder 2 is rotatably installed at the end of the rotating column 3. The end of the rotating column 3 extends into the support cylinder 2, and the rotating connection between the rotating column 3 and the support cylinder 2 is subjected to a rotation sealing treatment. The support cylinder 2 and the frame are connected. 1 is connected to the inner wall of the frame 1, a driving component for driving the rotating column 3 to rotate is arranged in the frame 1, a connecting hole 201 is arranged on the top and bottom of the supporting cylinder 2, a second connecting port 13 is installed on one side of the two connecting holes 201, two infusion channels 301 are symmetrically arranged on the rotating column 3, one end of the infusion channel 301 is connected to the hollow inner cavity of the fixing frame 7 through the connecting component, and the other end of the infusion channel 301 is connected to the connecting hole 201 when the fixing frame 7 is in a horizontal state, a heating component and a cooling component are arranged in the frame 1, and the heating component is connected to the two second connecting ports 13 located above The interfaces 13 are connected, and the cooling component is connected with the two second connection ports 13 located below; the arrangement of the support cylinder 2, the rotating column 3 and the infusion channel 301 ensures that no matter how the rotating column 3 rotates, the oil with a higher temperature is always input into the fixed frame 7 located above, and the oil with a lower temperature is always input into the fixed frame 7 located below, so that the temperature of the PCB board is adjusted by the temperature regulating plate 8, so that the top surface maintains a suitable welding temperature, and the bottom surface temperature is low to accelerate the solidification of the solder, reducing the decrease in solder joint firmness and component shedding due to excessively high temperature, thereby improving the reliability of the product.

[0022] In this embodiment, preferably, the connecting component includes a telescopic tube 9, a first connecting port 11 and a first infusion tube 12, the slide seat 5 is hollow, the inner cavity of the slide seat 5 is connected to the inner cavity of the fixed frame 7, one end of the telescopic tube 9 is connected to the slide seat 5, the other end of the telescopic tube 9 is connected to the first connecting port 11, the first connecting port 11 is arranged at the end of the guide rail 4, one end of the first infusion tube 12 is connected to the first connecting port 11, the other end of the first infusion tube 12 is connected to the infusion channel 301, the oil input into the second connecting port 13 enters the first infusion tube 12 through the infusion channel 301, and then enters the slide seat 5 through the first connecting port 11 and the telescopic tube 9, and finally flows into the fixed frame 7. The fixed frame 7 is in the fixed frame 7, so that the temperature of the fixed frame 7 is adjusted by oil; a spring 10 is sleeved on the telescopic tube 9, one end of the spring 10 is connected to the slide seat 5, and the other end of the spring 10 is connected to the end of the guide rail 4. A partition 6 is fixedly installed in the middle of the guide rail 4, and the partition 6 is located between the two slide seats 5. When the fixed frame 7 is not subjected to external force, the slide seat 5 is pressed on the partition 6 under the pressure of the spring 10. At this time, the two temperature regulating plates 8 are pressed on the PCB board to fix it. When placing the PCB board, the two fixed frames 7 are separated by manual or other feeding equipment, and after the PCB board is placed between the two fixed frames 7, the two fixed frames 7 are closed to fix the PCB board.

[0023] In this embodiment, preferably, the driving assembly includes a second electric push rod 31, a rack 30 and a gear 29, the gear 29 is fixedly mounted on one of the rotating columns 3, the top end of the second electric push rod 31 is fixedly connected to the frame 1, and the output end of the second electric push rod 31 is fixedly mounted with a rack 30, which is meshed with the gear 29; the rack 30 can be driven to move by the extension and retraction of the output end of the second electric push rod 31, and when the rack 30 moves, it can drive the gear 29 to rotate, thereby driving the rotating column 3 to rotate.

[0024] See also Figure 1 and Figure 2 In the embodiment of the present invention, a first electric push rod 25 is fixedly installed at the bottom of the inner cavity of the frame 1, and a lifting seat 26 is fixedly installed at the output end of the first electric push rod 25. An elastic support pad 27 is fixedly installed at the top of the lifting seat 26. The elastic support pad 27 is provided with a plurality of grooves adapted to the electronic components welded on the PCB board. The elastic support pad 27 is made of soft silicone material. When the PCB board is flipped, the lifting seat 26 is driven to rise by the output end of the first electric push rod 25, so that the elastic support pad 27 rises, so that the electronic components welded on the PCB board move into the groove at the top of the elastic support pad 27 and contact with the inner wall of the groove, thereby providing auxiliary support for the electronic components to prevent the electronic components from falling off the PCB board.

[0025] See also Figure 6 and Figure 7In the embodiment of the present invention, the heating component includes a hot liquid tank 22, the cooling component includes a cold liquid tank 21, and the four second connecting ports 13 are all connected with second infusion pipes 20, two of which are respectively connected with the two sides of the hot liquid tank 22, and the other two second infusion pipes 20 are respectively connected with the two sides of the cold liquid tank 21; both sides of the hot liquid tank 22 are provided with infusion components 24 for conveying oil.

[0026] In this embodiment, preferably, the infusion assembly 24 includes a cylinder 241, a piston 242, a plug rod 243 and a third infusion tube 245. The two cylinders 241 are fixedly installed on both sides of the hot liquid tank 22, respectively, and the piston 242 is slidably installed in the cylinder 241. The top of the piston 242 is fixedly connected with a tension spring 244, and the top of the tension spring 244 is fixedly connected to the top wall of the cylinder 241. The plug rod 243 is fixedly installed on the top of the piston 242, and the top of the plug rod 243 passes through the top wall of the cylinder 241. The bottom end of the cylinder 241 is provided with two third connecting ports 246, one of which is connected to the second infusion tube 20 on one side, and the other is connected to the third infusion tube 245. One of the third infusion tubes 245 is connected to the hot liquid tank 22, and the other is connected to the third infusion tube 24 5 is connected to the cold liquid tank 21, and a one-way valve 247 is arranged in each of the two third connection ports 246. The two one-way valves 247 are arranged in opposite directions, one of which allows the oil to flow out of the cylinder 241, and the other one-way valve 247 allows the oil to enter the cylinder 241; push plates 28 are fixedly installed on both sides of the lifting seat 26, and the two push plates 28 are respectively arranged just above the two plug rods 243; the plug rod 243 can be driven to rise and fall by lifting the lifting seat 26, and the lifting process of the lifting seat 26 is only performed after the PCB board is turned over. At this time, the PCB board is in a horizontal state, and the infusion channel 301 is connected to the second connection port 13, and the oil in the cylinder 241 can be transported to the second connection port 13, so that the oil can be transported at the right time, and the synchronization is good, which ensures the accurate operation of the infusion component 24.

[0027] See also Figure 8In the embodiment of the present invention, a thermostat 23 is arranged between the hot liquid tank 22 and the cold liquid tank 21. The thermostat 23 includes a mounting frame 231. A semiconductor cooling sheet 232 is embedded and installed inside the mounting frame 231. The heat release surface of the semiconductor cooling sheet 232 is in contact with the bottom wall of the hot liquid tank 22, and the heat absorption surface of the semiconductor cooling sheet 232 is in contact with the top wall of the cold liquid tank 21. The heat absorption surface of the semiconductor cooling sheet 232 absorbs the heat from the surface of the cold liquid tank 21, so that the oil temperature in the cold liquid tank 21 is The heat release surface of the semiconductor cooling sheet 232 releases heat to increase the temperature of the hot liquid tank 22, thereby increasing the temperature of the oil in the hot liquid tank 22; the temperature of the oil in the hot liquid tank 22 is 30℃-50℃, and the temperature of the oil in the cold liquid tank 21 is 0℃-20℃, and the specific temperature is adjusted according to the type of solder and the ambient temperature; the hot liquid tank 22 and the cold liquid tank 21 are designed with a thermostat 23 to achieve independent temperature control of the two sides of the fixed frame 7, that is, the PCB board. This design allows the top surface to be maintained at a higher temperature to facilitate welding, while the bottom surface is maintained at a lower temperature to accelerate the solidification of the solder, solving various welding quality problems caused by improper temperature control during double-sided welding.

[0028] Working principle: During welding, first separate the two fixed frames 7 manually or by feeding equipment, then place the PCB board between the two fixed frames 7, and make the two temperature regulating plates 8 fit the two sides of the PCB board, then weld the electronic components on the top surface of the PCB board by welding gun 19, after welding is completed, drive the rotating column 3 to rotate by the driving assembly, thereby driving the PCB board inside the fixed frame 7 to rotate, so that the PCB board is turned over, and then the side can be welded, thereby realizing double-sided welding of the PCB board; after the PCB board is turned over, the lifting seat 26 is driven to rise by the first electric push rod 25, thereby driving the elastic support pad 27 to rise, so that the electronic components welded on the PCB board are moved to the elastic support pad 2 7 is in the groove at the top and contacts with the inner wall of the groove, thereby providing auxiliary support for the electronic components; when the lifting seat 26 is lifted or lowered, the lifting seat 26 drives the push plates 28 on both sides to lift or lower. When the push plates 28 are lifted or lowered, the pulling force of the tension spring 244 is cooperated to enable the plug rod 243 to be lifted or lowered. When the plug rod 243 is lifted or lowered, the piston 242 is driven to lift or lower. The two oppositely arranged one-way valves 247 are arranged so that when the piston 242 rises, the oil in the cold liquid tank 21 / hot liquid tank 22 is drawn into the cylinder barrel 241 through the third liquid infusion pipe 245. When the piston 242 descends, the oil in the cylinder barrel 241 is input into the second connecting port 13 through the third liquid infusion pipe 245. The oil input into the second connecting port 13 enters the first liquid infusion channel 301. The oil in the fixed frame 7 is then fed into the liquid pipe 12, and then enters the slide seat 5 through the first connecting port 11 and the telescopic tube 9, and finally flows into the fixed frame 7, and the original oil in the fixed frame 7 is fed back to the cold liquid tank 21 / hot liquid tank 22 through the second infusion pipe 20 on the other side, so that the temperature of the fixed frame 7 is adjusted by the oil, and the temperature regulating plate 8 made of heat-conductive material fits with the PCB board, so that the temperature of the surface of the PCB board can be adjusted. Since the fixed frame 7 located above is connected with the second connecting port 13 located above through the telescopic tube 9, the first infusion pipe 12 and the infusion channel 301, and the second connecting port 13 located above is connected with the hot liquid tank 22 through the second infusion pipe 20, the temperature of the fixed frame 7 located above is higher, while the fixed frame 7 located below is The fixed frame 7 is connected with the second connecting port 13 located below through the telescopic tube 9, the first infusion tube 12 and the infusion channel 301, and the second connecting port 13 located below is connected with the cold liquid tank 21 through the second infusion tube 20, so that the temperature of the fixed frame 7 located below is relatively high, thereby making the top surface temperature of the PCB board relatively high, so that the top surface of the PCB board can maintain a suitable welding temperature, and can avoid the problem of poor welding caused by the welding temperature of the PCB board being too low, while the bottom surface temperature of the PCB board is relatively low, so that the solder at the welding completion position can be quickly solidified, and can also effectively prevent the problem of the solder on the ground heating up due to the high temperature of welding when welding the top surface, so that the electronic components on the bottom surface of the PCB board are not easy to fall off.

[0029] The above are only preferred embodiments of the present invention, so all equivalent changes or modifications made according to the structure, features and principles of the patent application scope of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A PCB electronic component welding device, comprising a frame, a welding gun arranged at the top of the frame cavity, and a fixing assembly for fixing the PCB board, characterized in that: The fixing assembly includes two symmetrically arranged guide rails, two symmetrically arranged fixing frames are arranged between the two guide rails, the frames of the fixing frames are hollow structures, temperature regulating plates are fixedly installed inside the two fixing frames, the two temperature regulating plates are respectively fitted with two surfaces of the PCB board installed between the two fixing frames, and a plurality of through slots are opened on the temperature regulating plates; The cam is connected with the control frame by the support frame, and the control frame is connected with the control frame by the support frame, and the control frame is connected with the control frame by the support frame. The connecting component includes a telescopic tube, a first connecting port and a first infusion tube. The slide seat is hollow. The inner cavity of the slide seat is connected to the inner cavity of the fixed frame. One end of the telescopic tube is connected to the slide seat, and the other end of the telescopic tube is connected to the first connecting port. The first connecting port is set at the end of the guide rail, one end of the first infusion tube is connected to the first connecting port, and the other end of the first infusion tube is connected to the infusion channel.

2. A PCB electronic component welding device according to claim 1, characterized in that: A spring is sleeved on the telescopic tube, one end of the spring is connected to the slide seat, and the other end of the spring is connected to the end of the guide rail. A partition is fixedly installed in the middle of the guide rail, and the partition is located between the two slide seats.

3. A PCB electronic component welding device according to claim 1, characterized in that: A first electric push rod is fixedly installed at the bottom of the inner cavity of the frame, a lifting seat is fixedly installed at the output end of the first electric push rod, an elastic support pad is fixedly installed at the top of the lifting seat, and a plurality of grooves compatible with electronic components welded on the PCB board are opened on the elastic support pad.

4. A PCB electronic component welding device according to claim 3, characterized in that: The heating component includes a hot liquid tank, and the cooling component includes a cold liquid tank. The four second connecting ports are all connected with second infusion tubes, two of which are respectively connected with the two sides of the hot liquid tank, and the other two second infusion tubes are respectively connected with the two sides of the cold liquid tank. Infusion components for conveying oil are provided on both sides of the hot liquid tank.

5. A PCB electronic component welding device according to claim 4, characterized in that: The infusion assembly includes a cylinder, a piston, a plug rod and a third infusion tube, the two cylinders are respectively fixedly installed on both sides of the hot liquid tank, the piston is slidably installed in the cylinder, the top of the piston is fixedly connected with a tension spring, the top of the tension spring is fixedly connected to the top wall of the cylinder, the plug rod is fixedly installed on the top of the piston, and the top of the plug rod passes through the top wall of the cylinder, and two third connecting ports are provided at the bottom end of the cylinder, one of the third connecting ports is connected to the second infusion tube on one side, and the other third connecting port is connected to the third infusion tube, one of the third infusion tubes is connected to the hot liquid tank, and the other third infusion tube is connected to the cold liquid tank, and one-way valves are provided in the two third connecting ports, and the two one-way valves are set in opposite directions.

6. A PCB electronic component welding device according to claim 5, characterized in that: Push plates are fixedly installed on both sides of the lifting seat, and the two push plates are respectively arranged directly above the two plug rods.

7. A PCB electronic component welding device according to claim 4, characterized in that: A thermostat is arranged between the hot liquid tank and the cold liquid tank, and the thermostat includes a mounting frame, in which a semiconductor refrigeration plate is embedded and installed, the heat release surface of the semiconductor refrigeration plate is in contact with the bottom wall of the hot liquid tank, and the heat absorption surface of the semiconductor refrigeration plate is in contact with the top wall of the cold liquid tank.

8. A PCB electronic component welding device according to claim 1, characterized in that: The driving assembly includes a second electric push rod, a rack and a gear. The gear is fixedly sleeved on one of the rotating columns. The top end of the second electric push rod is fixedly connected to the frame. The output end of the second electric push rod is fixedly installed with a rack, and the rack is meshed with the gear.

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