Low-cost energy storage type scaling powder cleaning device

Abstract

The invention relates to the technical field of semiconductor chip welding, in particular to a low-cost energy storage type scaling powder cleaning device which comprises an adsorption cylinder, an elastic assembly and a suction nozzle. The adsorption cylinder comprises a cylinder body and a piston fixedly provided with a push rod, a piston cavity is formed in the cylinder body, and the piston is arranged in the piston cavity in a sliding mode and divides the piston cavity into a scaling powder adsorption cavity and a control cavity; the elastic assembly abuts against the push rod or the piston. The adsorption cylinder is matched with the elastic assembly to form a negative pressure adsorption structure capable of storing and releasing energy, the piston is made to move towards the soldering flux adsorption cavity in advance, the elastic assembly is forced to be compressed to store energy, when soldering flux needs to be adsorbed, the control cavity exhausts air, and the elastic force of the elastic assembly is released instantly, so that the soldering flux is adsorbed, and the soldering flux is adsorbed. The piston rapidly moves towards the control cavity, the size of the soldering flux adsorption cavity is suddenly changed and is suddenly increased, then instant large suction force is generated at the position of the suction nozzle to adsorb soldering flux, the overall structure is simple, and cost is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of semiconductor chip welding technology, and in particular to a low-cost energy storage flux cleaning device. Background Technology

[0002] In the field of electronic component soldering, selective wave soldering has become a core process to replace traditional wave soldering due to its characteristics of "precise soldering and low thermal damage". It is especially suitable for the soldering needs of complex PCB boards with heat-sensitive components (such as sensors and chips). Flux spraying is a key process in selective wave soldering, and its control precision directly determines the subsequent soldering quality. After the flux is applied to the spray valve, the residual flux needs to be cleaned to avoid abnormal spraying. The flux is made of rosin, tackifier, activator and other solvents, and has strong viscosity and corrosiveness. The residual flux at the valve port can be adsorbed by the negative pressure adsorption structure. Existing flux adsorption devices mainly consist of a vacuum pump, filter, pipeline, and nozzle. The nozzle, filter, and vacuum pump are connected in series through pipeline. During operation, the vacuum pump causes the nozzle to generate suction to adsorb the flux remaining at the valve orifice of the spraying valve. In this process, the flux in the gas adsorbed by the nozzle is filtered by the filter, but some flux still reaches the vacuum pump. This flux easily adheres to the vacuum pump and pipeline, causing corrosion and affecting the life of the vacuum pump. In other words, this solution is prone to causing large-scale corrosion of the flux adsorption device, and equipping the welding equipment with an additional vacuum pump will lead to higher costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in order to solve the problem that flux adsorption devices in the prior art are easily corroded and have high costs, a low-cost energy storage flux cleaning device is provided.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a low-cost energy storage flux cleaning device, including an adsorption cylinder, an elastic component and a suction nozzle; The adsorption cylinder includes a cylinder body and a piston with a fixed push rod. The cylinder body has a piston chamber, and the piston is slidably disposed in the piston chamber. The piston divides the piston chamber into a flux adsorption chamber and a control chamber. The elastic component abuts against the push rod or piston and is compressed to store energy as the piston moves toward the flux adsorption chamber. The nozzle is connected to the flux adsorption chamber. When the control chamber of the adsorption cylinder exhausts air, the compressed and stored elastic component pushes the push rod or piston to move, making the volume of the flux adsorption chamber larger and causing the nozzle to generate suction.

[0005] Furthermore, the piston is configured to move toward the flux adsorption chamber when gas is introduced into the control chamber, thereby compressing and storing energy in the elastic component.

[0006] Furthermore, the elastic component includes a compression spring and a spring seat. The elastic component is disposed outside the adsorption cylinder. The push rod is fixedly connected to one end of the piston near the flux adsorption chamber. The push rod extends outside the cylinder body. The compression spring is sleeved on the push rod. One end of the compression spring is fixedly connected to the push rod or abuts against the push rod, and the other end abuts against the spring seat.

[0007] Furthermore, the elastic component includes a compression spring, which is disposed inside the adsorption cylinder. The compression spring is sleeved on the push rod, with one end of the compression spring fixedly connected to the piston and the other end abutting against the inner wall of the flux adsorption chamber opposite to the piston.

[0008] Furthermore, the spring seat has a piston port through which the push rod passes, and the spring seat has an adjustment structure for adjusting the distance between the spring seat and the cylinder.

[0009] Furthermore, a waste collection chamber is provided at the connection between the suction nozzle and the adsorption cylinder. One end of the waste collection chamber is fixedly connected to the cylinder body, and the other end is fixedly connected to the suction nozzle. The waste collection chamber has a waste receiving cavity, one end of which is connected to the flux adsorption cavity, and the other end is connected to the central suction hole of the suction nozzle; The waste container cavity is equipped with a collection membrane that divides its upper and lower spaces, and a gap is left between the outer peripheral wall of the collection membrane and the waste container cavity.

[0010] Furthermore, the surface area of ​​the collection membrane near the suction nozzle is larger than the cross-sectional area of ​​the central suction hole: The waste receiving cavity is connected to the flux adsorption cavity through a flow channel at one end away from the suction nozzle, and the surface area of ​​the collecting membrane on the side away from the suction nozzle is larger than the cross-sectional area of ​​the flow channel.

[0011] Furthermore, the waste receiving cavity located below the collection membrane has a lower conical section, the cross-sectional area of ​​which gradually decreases from top to bottom, and the small end of the lower conical section is connected to the central suction hole; The waste receiving cavity has an upper conical section located above the collection membrane, and the small end of the upper conical section is connected to the flow channel; The cross-sectional areas of the central suction hole and the flow channel are both smaller than the maximum cross-sectional area of ​​the waste receiving cavity.

[0012] Furthermore, the control chamber is connected to an air outlet, and the control valve is located at the air outlet of the adsorption cylinder to regulate the negative pressure changes within the adsorption cylinder.

[0013] Furthermore, the control valve is a solenoid valve or a pneumatic valve.

[0014] The beneficial effects of this invention are: The low-cost energy storage flux cleaning device of the present invention forms a negative pressure adsorption structure for energy storage and release by using an adsorption cylinder and an elastic component. By moving the piston toward the flux adsorption chamber in advance, the elastic component is forced to be compressed and stored. When flux needs to be adsorbed, the control chamber is vented, the elastic force of the elastic component is released instantly, the piston moves rapidly toward the control chamber, the volume of the flux adsorption chamber suddenly increases sharply, and a large instantaneous suction force is generated at the suction nozzle to adsorb the flux. The overall structure is simple, eliminating the need for vacuum pumps and filters, effectively reducing costs. Furthermore, after the nozzle adsorbs flux, the flux in the flux adsorption chamber is blocked by the piston on the side closest to the flux adsorption chamber. This means that the adsorbed flux is difficult to pass over the piston and diffuse, reducing the corrosion of the negative pressure adsorption structure by the flux. In addition, the nozzle in this invention generates instantaneous suction intermittently, and the suction is not continuous. Therefore, during the process of the nozzle adsorbing flux and moving the flux along the nozzle towards the flux adsorption chamber, the suction stops before some of the flux reaches the flux adsorption chamber. This shortens the movable path of the flux during each adsorption, further reducing the diffusion of flux into the negative pressure adsorption structure and improving service life.

[0015] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a front view of a low-cost, energy-storage flux cleaning device installed on a wave soldering machine. Figure 2 This is a three-dimensional schematic diagram of a low-cost energy storage flux cleaning device installed on a wave soldering equipment; Figure 3 yes Figure 2 A magnified view of part A in the image; Figure 4 This is a front view of a low-cost, energy-storage flux cleaning device; Figure 5 This is a longitudinal cross-sectional view of a low-cost energy storage flux cleaning device; Figure 6 yes Figure 5 A magnified view of part B in the image; Figure 7 This is a longitudinal cross-sectional view of the compressed spring in the energy storage state of a low-cost energy storage flux cleaning device. Figure 8 This is a longitudinal cross-sectional view of the low-cost energy storage flux cleaning device in the released state of the compressed spring; In the diagram: 1. Cylinder block; 101. Push rod; 102. Piston; 103. Piston chamber; 104. Flux absorption chamber; 105. Control chamber; 2. Flexible components; 3. Suction nozzle; 301. Central suction hole; 302. Flow channel; 4. Air vent; 5. Control valve; 6. Compression spring; 7. Spring seat; 71. Piston port; 8. Waste collection chamber; 81. Waste receiving cavity; 9. Collection membrane; 10. Spraying valve; 1001. Valve port; 11. Truss. Detailed Implementation

[0018] The invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner. Therefore, they only show the components relevant to the invention, and the orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be limiting, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0019] like Figure 4 and Figure 5 As shown, a low-cost energy storage flux cleaning device includes an adsorption cylinder, an elastic component 2, and a suction nozzle 3. The adsorption cylinder includes a cylinder body 1 and a piston 102 with a push rod 101 fixed thereon. The cylinder body 1 has a piston chamber 103. The piston 102 is slidably disposed in the piston chamber 103. The piston 102 divides the piston chamber 103 into a flux adsorption chamber 104 and a control chamber 105. The elastic component 2 abuts against the push rod 101 or the piston 102 and is compressed and stored as the piston 102 moves toward the flux adsorption chamber 104. The nozzle 3 is connected to the flux adsorption chamber 104. When the control chamber 105 of the adsorption cylinder exhausts, the compressed energy storage elastic component 2 pushes the push rod 101 or piston 102 to move, making the volume of the flux adsorption chamber 104 larger, which causes the nozzle 3 to generate suction.

[0020] By pre-moving the piston 102 toward the flux adsorption chamber 104, the elastic component 2 is forced to be compressed and stored. When flux needs to be adsorbed, the control chamber 105 is vented, and the elastic force of the elastic component 2 is released instantly. The piston 102 moves rapidly toward the control chamber 105, and the volume of the flux adsorption chamber 104 suddenly increases dramatically, thereby generating a large instantaneous suction force at the nozzle 3 to adsorb flux. The overall structure is simple, eliminating the need for a vacuum pump and filter, effectively reducing costs.

[0021] In some examples, the piston 102 is configured to move toward the flux adsorption chamber 104 when gas is introduced into the control chamber 105, so that the elastic component 2 is compressed and stored, the compressed spring 6 is released and stored, and the piston 102 is driven to instantly increase the volume of the flux adsorption chamber 104 to generate negative pressure and quickly remove flux.

[0022] In some examples, the elastic component 2 includes a compression spring 6 and a spring seat 7. The elastic component 2 is disposed outside the adsorption cylinder. The push rod 101 is fixedly connected to one end of the piston 102 near the flux adsorption chamber 104. The push rod 101 extends outside the cylinder body 1. The compression spring 6 is sleeved on the push rod 101. One end of the compression spring 6 is fixedly connected to the push rod 101 or abuts against the push rod 101, and the other end abuts against the spring seat 7. The push rod 101 is used to compress the external compression spring 6 to store energy, thus avoiding the compression spring 6 occupying the internal space of the adsorption cylinder.

[0023] In some examples, the elastic component 2 includes a compression spring 6, which is disposed inside the adsorption cylinder. The compression spring 6 is sleeved on the push rod 101. One end of the compression spring 6 is fixedly connected to the piston 102, and the other end abuts against the inner wall of the flux adsorption chamber 104 away from the piston 102. The compression spring 6 is embedded in the cylinder body 1, eliminating the need for external supports and improving protection.

[0024] In some examples, the spring seat 7 has a piston port 71 through which the push rod 101 passes. The spring seat 7 has an adjustment structure for adjusting the distance between the spring seat 7 and the cylinder 1. By adjusting the distance between the spring seat 7 and the cylinder 1, the speed and distance at which the piston 102 or the push rod 101 moves toward the control cavity 105 can be adjusted.

[0025] In some examples, the connection between the suction nozzle 3 and the adsorption cylinder is provided with a waste collection chamber 8, one end of which is fixedly connected to the cylinder body 1 and the other end is fixedly connected to the suction nozzle 3; The waste collection chamber 8 has a waste receiving cavity 81. One end of the waste receiving cavity 81 is connected to the flux adsorption cavity 104, and the other end is connected to the central suction hole 301 of the suction nozzle 3. The waste receiving cavity 81 is provided with a collection membrane 9 to divide its upper and lower spaces. A gap is left between the outer peripheral wall of the collection membrane 9 and the waste receiving cavity 81 for filtering and intercepting waste in the airflow.

[0026] In some examples, such as Figure 6 As shown, the surface area of ​​the collection membrane 9 near the suction nozzle 3 is larger than the cross-sectional area of ​​the central suction hole 301; The waste receiving cavity 81 is connected to the flux adsorption cavity 104 through the flow channel 302 at one end away from the suction nozzle 3. The surface area of ​​the collecting membrane 9 on the side away from the suction nozzle 3 is larger than the cross-sectional area of ​​the flow channel 302, which reduces the flow rate of waste when it enters, expands the collection range, and makes the airflow containing flux more evenly distributed on the surface of the collecting membrane 9, reducing local blockage.

[0027] In some examples, such as Figure 6 As shown, the waste receiving cavity 81 has a lower conical section located below the collection membrane 9. The cross-sectional area of ​​the lower conical section gradually decreases from top to bottom, and the small end of the lower conical section is connected to the central suction hole 301. The waste receiving cavity 81 has an upper conical section located above the collecting membrane 9, and the small end of the upper conical section is connected to the flow channel 302; The cross-sectional areas of the central suction hole 301 and the flow channel 302 are both smaller than the maximum cross-sectional area of ​​the waste receiving cavity 81, which reduces the flow velocity of waste when it enters and expands the collection range.

[0028] In some examples, the control chamber 105 is connected to an outlet 4, and the control valve 5 is located at the outlet 4 of the adsorption cylinder to regulate the negative pressure change in the adsorption cylinder. The control valve 5 is a solenoid valve or a pneumatic valve. When the control valve 5 is opened, the control chamber 105 exhausts gas. When gas is introduced into the control chamber 105, the piston 102 moves toward the flux adsorption chamber 104, the compression spring 6 is compressed and stored, and then the control valve 5 is closed, the gas is sealed in the control chamber 105, and the piston 102 stops at the position where the compression spring 6 is compressed and stored.

[0029] In some examples, an electric push rod can be used to move the piston 102 toward the flux absorption chamber 104, thereby storing energy in the compression spring 6.

[0030] like Figure 1 and Figure 2 As shown, taking a selective wave soldering equipment as an example, the low-cost energy storage flux cleaning device of the present invention is fixed on the truss 11, the suction end of the central suction hole 301 of the suction nozzle 3 faces downward, and the workpiece can be transported by the conveying mechanism on the truss 11. The spray valve 10 of the selective wave soldering equipment can reciprocate between the workpiece and the nozzle 3, and the valve port 1001 of the spray valve 10 spraying flux faces upward. When the valve port 1001 of the spray valve 10 needs to be cleaned of residual flux: S1, Loading: (e.g., ...) Figure 7 As shown, gas is introduced into the control chamber 105 of the adsorption cylinder beforehand, the piston 102 moves into the flux adsorption chamber 104, the compression spring 6 is compressed and stored, and then the control valve 5 is closed, and the gas is sealed in the control chamber 105. S2, Movement: such as Figure 1 , Figure 2 and Figure 3 As shown, move the spray valve 10 for cleaning flux to below the nozzle 3, so that the suction end of the central suction hole 301 of the nozzle 3 is aligned with the valve port 1001 of the spray valve 10 below. S3, Release: (e.g., ...) Figure 8 As shown, when control valve 5 is opened, control chamber 105 is vented, the holding force exerted by the gas in control chamber 105 on piston 102 is removed, the elastic force of compression spring 6 is released instantaneously, piston 102 moves rapidly towards control chamber 105, the volume of flux adsorption chamber 104 suddenly increases dramatically, and a large instantaneous suction force is generated at the suction end of central suction hole 301 to adsorb residual flux near valve port 1001 of spray valve 10, thereby realizing the cleaning of residual flux near valve port 1001 of spray valve 10 by using the instantaneously released suction force.

[0031] The above description, based on the preferred embodiments of the present invention, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A low-cost energy storage flux cleaning device, characterized in that: Includes an adsorption cylinder, an elastic component (2), and a suction nozzle (3); The adsorption cylinder includes a cylinder body (1) and a piston (102) with a push rod (101) fixed inside. The cylinder body (1) has a piston chamber (103). The piston (102) is slidably disposed in the piston chamber (103). The piston (102) divides the piston chamber (103) into a flux adsorption chamber (104) and a control chamber (105). The elastic component (2) abuts against the push rod (101) or the piston (102) for being compressed and storing energy as the piston (102) moves toward the flux adsorption chamber (104); The nozzle (3) is connected to the flux adsorption chamber (104). When the control chamber (105) of the adsorption cylinder exhausts, the compressed energy storage elastic component (2) pushes the push rod (101) or piston (102) to move, making the volume of the flux adsorption chamber (104) larger, causing the nozzle (3) to generate suction.

2. The low-cost energy storage flux cleaning device according to claim 1, characterized in that: The piston (102) is configured to move toward the flux adsorption chamber (104) when gas is introduced into the control chamber (105) so that the elastic component (2) is compressed and stores energy.

3. The low-cost energy storage flux cleaning device according to claim 1, characterized in that: The elastic component (2) includes a compression spring (6) and a spring seat (7). The elastic component (2) is located outside the adsorption cylinder. The push rod (101) is fixedly connected to one end of the piston (102) near the flux adsorption chamber (104). The push rod (101) extends outside the cylinder body (1). The compression spring (6) is sleeved on the push rod (101). One end of the compression spring (6) is fixedly connected to the push rod (101) or abuts against the push rod (101), and the other end abuts against the spring seat (7).

4. The low-cost energy storage flux cleaning device according to claim 1, characterized in that: The elastic component (2) includes a compression spring (6). The elastic component (2) is disposed inside the adsorption cylinder. The compression spring (6) is sleeved on the push rod (101). One end of the compression spring (6) is fixedly connected to the piston (102), and the other end abuts against the inner wall of the flux adsorption chamber (104) away from the piston (102).

5. A low-cost energy storage flux cleaning device according to claim 3, characterized in that: The spring seat (7) has a piston port (71) through which the push rod (101) passes. The spring seat (7) has an adjustment structure for adjusting the distance between the spring seat (7) and the cylinder (1).

6. The low-cost energy storage flux cleaning device according to claim 1, characterized in that: The connection between the suction nozzle (3) and the adsorption cylinder is provided with a waste collection chamber (8). One end of the waste collection chamber (8) is fixedly connected to the cylinder body (1), and the other end is fixedly connected to the suction nozzle (3). The waste collection chamber (8) has a waste receiving cavity (81), one end of which is connected to the flux adsorption cavity (104), and the other end is connected to the central suction hole (301) of the suction nozzle (3); The waste container (81) is provided with a collection membrane (9) to divide its upper and lower spaces, and there is a gap between the outer peripheral wall of the collection membrane (9) and the waste container (81).

7. A low-cost energy storage flux cleaning device according to claim 6, characterized in that: The surface area of ​​the collecting membrane (9) on the side near the suction nozzle (3) is greater than the cross-sectional area of ​​the central suction hole (301); The end of the waste receiving cavity (81) away from the suction nozzle (3) is connected to the flux adsorption cavity (104) through the flow channel (302), and the surface area of ​​the collecting membrane (9) away from the suction nozzle (3) is greater than the cross-sectional area of ​​the flow channel (302).

8. The low-cost energy storage flux cleaning device according to claim 7, characterized in that: The waste receiving cavity (81) located below the collection membrane (9) has a lower conical section, the cross-sectional area of ​​which gradually decreases from top to bottom, and the small end of the lower conical section is connected to the central suction hole (301). The waste receiving cavity (81) located above the collecting membrane (9) has an upper conical section, the small end of which is connected to the flow channel (302); The cross-sectional areas of the central suction hole (301) and the flow channel (302) are both smaller than the maximum cross-sectional area of ​​the waste receiving cavity (81).

9. A low-cost energy storage flux cleaning device according to claim 1, characterized in that: The control chamber (105) is connected to an air outlet (4), and the control valve (5) is located at the air outlet (4) of the adsorption cylinder to adjust the negative pressure change in the adsorption cylinder.

10. A low-cost energy storage flux cleaning device according to claim 9, characterized in that: The control valve (5) is a solenoid valve or a pneumatic valve.

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