SMT paster cleaning device capable of avoiding solvent volatilization

Abstract

The invention discloses an SMT patch cleaning device capable of avoiding solvent volatilization, and relates to the technical field of cleaning, the cleaning device comprises a cleaning box, a conveying device, an adjusting device and a collecting device, the conveying device is connected with the cleaning box, the adjusting device is connected with the conveying device, the collecting device is fixedly connected with the cleaning box, and the cleaning box is provided with a cleaning cavity; the collecting device communicates with the cleaning cavity through a pipeline. The cleaning box serves as a main installation foundation and is used for installing other devices, a cleaning space is provided through the cleaning cavity, the conveying device is used for conveying workpieces, the cleaning angle of the workpieces is adjusted through the adjusting device, and therefore dead-corner-free cleaning is carried out, negative pressure is generated through the collecting device, gas drainage is carried out through the negative pressure, and the cleaning efficiency is improved. Solvent volatilization is avoided, and the situation that the cleaning quality is affected due to solvent concentration reduction in the continuous cleaning process is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of cleaning, in particular to an SMT patch cleaning device which avoids solvent volatilization. Background Art

[0002] SMT patch processing generally includes dispensing, mounting, curing, reflow soldering, testing and rework processes. Among them, the cleaning process is mainly to remove the soldering residue and other debris in the gaps of the patch, and organic solvents can be used for cleaning.

[0003] However, current cleaning devices, such as ultrasonic cleaning, can remove impurities from the patch, but are also accompanied by energy accumulation during use, causing temperature increases, which in turn causes the solvent to heat up, increasing the solvent's volatilization rate, thereby reducing the solvent concentration in the cleaning agent, thereby affecting the cleaning quality.

[0004] In addition, some other cleaning devices have a relatively single cleaning direction, and the liquid mostly flows in an orderly manner. The cleaning effect is not good for the complex circuit settings on the patch. Summary of the invention

[0005] The object of the present invention is to provide an SMT patch cleaning device which avoids solvent volatilization, so as to solve the problems raised in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions: The cleaning device comprises a cleaning box, a conveying device, an adjusting device and a collecting device. The conveying device is connected to the cleaning box, the adjusting device is connected to the conveying device, the collecting device is tightly connected to the cleaning box, a cleaning cavity is provided on the cleaning box, and the collecting device is connected to the cleaning cavity pipeline.

[0007] The cleaning box serves as the main installation basis for installing other devices and provides cleaning space through the cleaning chamber. The conveying device is used to convey the workpiece. The cleaning angle of the workpiece is adjusted through the adjusting device, so as to perform cleaning without dead angles. Negative pressure is created through the collecting device, and gas is drained through the negative pressure to avoid solvent volatilization and prevent the solvent concentration from decreasing during the continuous cleaning process, thereby affecting the cleaning quality.

[0008] Furthermore, the conveying device includes a conveying chain and a sprocket, a chain groove is provided on the cleaning box, the sprocket and the chain groove are rotatably connected, the sprocket and the conveying chain are chain-driven, and the conveying chain is connected to the adjusting device; The adjusting device includes an alignment component, a jet pipe, and a blunt body. The alignment component has several components arranged along the conveying chain. The alignment component includes a middle support plate and a carrier plate. There are two sets of conveying chains. The two sides of the middle support plate are respectively and firmly connected to the conveying chains. A switching groove is provided on the middle support plate. The carrier plate is placed in the switching groove, and the carrier plate is movably connected to the switching groove. The jet pipe and the blunt body are respectively and firmly connected to the carrier plate. A clamping groove is provided on the carrier plate, and the carrier plate fixes the workpiece through the clamping groove. The outlet of the jet pipe faces the blunt body, and the jet pipe, the blunt body, and the workpiece are arranged in sequence.

[0009] The sprocket is rotationally supported through the chain groove. Through chain drive, the sprocket drives the conveying chain to perform a rotary motion during rotation. Several middle support plates are provided between the two conveying chains. The middle support plate installs the carrier plate through the switching groove and fixes the workpiece through the clamping groove on the carrier plate, thereby driving the workpiece to move. The conveying chain includes two parts. The upper part is above the liquid surface for feeding, and the lower part is immersed under the liquid surface to facilitate cleaning the workpiece. The jet pipe is connected to high-pressure fluid and sprays towards the blunt body. The blunt body plays a role in blocking the flow. It is a non-streamlined body, such as a cylinder, a sphere, etc. When the high-pressure fluid flows through the blunt body, flow separation is formed on its boundary, and vortices are generated at the rear. The vortices automatically clean the irregular surface of the workpiece to improve the cleaning quality. By the high-pressure fluid flowing through both sides of the blunt body, due to the different instantaneous velocities of the fluid on both sides of the blunt body, the generated instantaneous pressures are also different, forming alternating eddies, thereby cleaning both sides of the workpiece simultaneously and improving the cleaning efficiency.

[0010] Furthermore, the alignment component further includes a shaft seat. The shaft seat is rotationally connected to the switching groove. Rotating shafts are respectively provided on both sides of the carrier plate, and shaft holes are provided on the shaft seat. The rotating shafts are inserted into the shaft holes, and the rotating shafts are rotationally connected to the shaft holes.

[0011] By setting the shaft seat, the shaft holes on it are used to rotationally support the rotating shafts. The carrier plate is supported at both ends through the two rotating shafts. Through the movable connection, the workpiece and the carrier plate are deflected together under force, preventing the impurities washed out from redepositing on the surface of the workpiece under the action of gravity.

[0012] Furthermore, reset grooves are respectively provided on both sides of the shaft hole. Pressure-regulating springs are respectively provided in the two reset grooves. A transmission plate is provided on the rotating shaft. The ends of the two pressure-regulating springs away from the reset grooves are respectively and firmly connected to the two side wall surfaces of the transmission plate, and the elastic coefficients of the two pressure-regulating springs are different.

[0013] By setting the reset grooves to install the two pressure-regulating springs, when the workpiece swings with the carrier plate, it will drive the pressure-regulating springs on both sides to stretch or compress, thereby assisting in resetting, reducing the swing amplitude, increasing the swing rate, and thus improving the cleaning efficiency. At the same time, by setting two pressure-regulating springs with different elastic coefficients, the workpiece is in a non-horizontal arrangement in the initial state, which is convenient for improving the swing response efficiency.

[0014] Further, the steering component further includes a steering motor, which is fixedly connected to the middle support plate, and the output end of the steering motor is drivingly connected to the shaft seat; Initially: The jet pipe, the bluff body and the workpiece are arranged along the conveying direction of the conveying chain. The pressure regulating spring with a large elastic coefficient is located above the pressure regulating spring with a small elastic coefficient, and one end of the workpiece away from the rotating shaft is inclined upward; During commutation: The arrangement directions of the jet pipe, the bluff body and the workpiece are opposite to the conveying direction of the conveying chain. The pressure regulating spring with a large elastic coefficient is located below the pressure regulating spring with a small elastic coefficient, and one end of the workpiece away from the rotating shaft is inclined downward.

[0015] When cleaning the surface of the workpiece, it is divided into two stages, namely the initial cleaning stage and the cleaning stage after commutation. Initially, the liquid outlet direction of the jet pipe is opposite to the conveying direction of the conveying chain here, so as to drive the workpiece in this stage to swing under the action of the vortex street; during commutation, the steering motor outputs torque, which is successively transmitted through the shaft seat, the pressure regulating spring, the transmission plate, the rotating shaft and the carrier plate to drive the workpiece to flip 180°. The jet pipes in both stages spray high-pressure fluid at the same time to form vortices and impact the surface of the workpiece in an inclined state, so that the deflection directions of the two workpieces are the same, and the generated vortices impact and disperse between the two workpieces, improving the disorder of local fluid movement, thereby improving the multi-directional cleaning quality of the workpiece with an asymmetric surface.

[0016] Further, the collection device includes a collection box and a reflux pump. The inlet of the reflux pump is connected to the cleaning chamber through a pipeline, and the outlet of the reflux pump is connected to the collection box through a pipeline.

[0017] By setting the reflux pump, when the reflux pump is started, the inlet end is in a low-pressure state and is connected to the cleaning chamber, so that the volatilized solvent enters the collection box through the reflux pump, preventing the solvent from diffusing and the concentration from decreasing, which affects the continuous cleaning efficiency.

[0018] As an optimization, the collection device further includes a refrigeration pipe. There is a refrigeration chamber on the collection box, the refrigeration pipe is placed in the refrigeration chamber, a liquid outlet is arranged at the lower end of the refrigeration chamber, and the liquid outlet of the refrigeration chamber is connected to the cleaning chamber through a pipeline. The volatilized solvent pumped into the refrigeration chamber is cooled through the refrigeration pipe, re-liquefied, and re-enters the cleaning chamber through the liquid outlet at the lower end, which helps to ensure the uniform solvent concentration.

[0019] As an optimization, the conveying device further includes a driving motor, which is fixedly connected to the cleaning box, and the output end of the driving motor is drivingly connected to the sprocket. The motor housing of the driving motor is fixed on the cleaning box, and the output torque drives the sprocket to rotate, thereby driving the conveying chain to perform a rotary motion.

[0020] As an optimization, a transmission shaft is provided between two sprockets with coincident axes. By setting the transmission shaft, the two sprockets with coincident axes rotate synchronously, improving the feeding stability.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: The jet pipe is connected to high-pressure fluid and sprays towards the blunt body. The blunt body plays a role in blocking the flow. It is a non-streamlined body, such as a cylinder, a sphere, etc. When the high-pressure fluid flows through the blunt body, flow separation is formed on its boundary, and vortices are generated at the rear. The irregular surface of the workpiece is automatically cleaned through the vortices, improving the cleaning quality. By the high-pressure fluid flowing through both sides of the blunt body, due to the different instantaneous velocities of the fluids on both sides of the blunt body, the generated instantaneous pressures are also different, forming alternating eddy currents, thereby cleaning both sides of the workpiece simultaneously and improving the cleaning efficiency; by setting two pressure-regulating springs with different elastic coefficients, the workpiece is arranged non-levelly in the initial state, which is convenient for improving the swing response efficiency; the jet pipes in two stages spray high-pressure fluid simultaneously, forming vortices and impacting the surface of the workpiece in an inclined state, so that the deflection directions of the two workpieces are the same, and the generated vortices impact and disperse between the two workpieces, increasing the disorderliness of the local fluid motion, thereby improving the multi-directional cleaning quality of the workpiece with an asymmetric surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of the collection device of the present invention; Figure 3 is Figure 2 the enlarged view of the partial A of the view; Figure 4 is the schematic diagram of multi-angle flushing of the workpiece of the present invention; Figure 5 is Figure 4 the enlarged view of the partial B of the view; Figure 6 is the structural schematic diagram of the direction-adjusting assembly of the present invention; Figure 7 is the schematic diagram of the power transmission of the reversing flushing of the present invention; Figure 8 is the schematic diagram of the solvent collection and cooling of the present invention.

[0023] In the figure: 1. Cleaning tank; 11. Cleaning chamber; 12. Chain groove; 2. Conveying device; 21. Conveying chain; 22. Sprocket; 23. Driving motor; 3. Adjusting device; 31. Direction-adjusting assembly; 311. Middle bearing plate; 3111. Switching groove; 312. Axle seat; 3121. Axle hole; 3122. Reset groove; 313. Direction-adjusting motor; 314. Transmission plate; 315. Carrier plate; 316. Rotating shaft; 317. Pressure-regulating spring; 32. Jet pipe; 33. Blunt body; 4. Collection device; 41. Collection box; 42. Return pump; 43. Refrigeration pipe; 5. Workpiece. DETAILED DESCRIPTION OF THE INVENTION

[0024] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0025] Example: Figures 1-8 As shown, the present invention provides a technical solution for an SMT patch cleaning device that avoids solvent volatilization.

[0026] The cleaning device includes a cleaning box 1, a conveying device 2, an adjusting device 3 and a collecting device 4. The conveying device 2 is connected to the cleaning box 1, the adjusting device 3 is connected to the conveying device 2, the collecting device 4 is firmly connected to the cleaning box 1, a cleaning chamber 11 is provided on the cleaning box 1, and the collecting device 4 is connected to the cleaning chamber 11 by a pipeline.

[0027] The cleaning box 1 serves as the main installation base for installing other devices and provides a cleaning space through the cleaning chamber 11. The conveying device 2 is used to convey the workpiece 5. The cleaning angle of the workpiece 5 is adjusted by the adjusting device 3, so as to perform cleaning without dead angles. Negative pressure is created by the collecting device 4, and gas is drained by the negative pressure to avoid solvent volatilization and prevent the solvent concentration from decreasing during the continuous cleaning process, thereby affecting the cleaning quality.

[0028] Further, the conveying device 2 includes a conveying chain 21 and a sprocket 22, a chain groove 12 is provided on the cleaning box 1, the sprocket 22 and the chain groove 12 are rotatably connected, the sprocket 22 and the conveying chain 21 are chain-driven, and the conveying chain 21 is connected to the adjusting device 3; The adjusting device 3 includes a direction adjustment component 31, a jet tube 32 and a bluff body 33. The direction adjustment component 31 is provided with several components along the conveying chain 21. The direction adjustment component 31 includes a middle supporting plate 311 and a carrier plate 315. The conveying chain 21 is provided with two groups. Both sides of the middle supporting plate 311 are respectively fastened to the conveying chain 21. A switching groove 3111 is provided on the middle supporting plate 311. The carrier plate 315 is placed in the switching groove 3111. The carrier plate 315 and the switching groove 3111 are movably connected. The jet tube 32 and the bluff body 33 are respectively fastened to the carrier plate 315. A clamping groove is provided on the carrier plate 315. The carrier plate 315 fixes the workpiece 5 through the clamping groove. The outlet of the jet tube 32 faces the bluff body 33. The jet tube 32, the bluff body 33 and the workpiece 5 are arranged in sequence.

[0029] The sprocket wheel 22 is rotationally supported by the chain groove 12. Through chain drive, when the sprocket wheel 22 rotates, it drives the conveying chain 21 to perform a rotary motion. A number of intermediate bearing plates 311 are arranged between the two conveying chains. The intermediate bearing plate 311 installs the carrier plate 315 through the switching groove 3111 and fixes the workpiece through the clamping groove on the carrier plate 315, thereby driving the workpiece to move. The conveying chain 21 includes two parts. The upper part is located above the liquid surface for feeding, and the lower part is immersed under the liquid surface to facilitate cleaning the workpiece 5. The jet pipe 32 is connected to high-pressure fluid and jets towards the bluff body 33. The bluff body 33 plays a role in blocking the flow and is a non-streamlined body, such as a cylinder, a sphere, etc. When the high-pressure fluid flows through the bluff body 33, flow separation is formed on its boundary, and vortices are generated at the rear. The irregular surface of the workpiece 5 is automatically cleaned through the vortices, improving the cleaning quality. When the high-pressure fluid flows through both sides of the bluff body 33, due to the different instantaneous velocities of the fluid on both sides of the bluff body, the generated instantaneous pressures are also different, forming alternating eddy currents, thereby cleaning both sides of the workpiece simultaneously and improving the cleaning efficiency.

[0030] Further, the orientation adjustment assembly 31 further includes a shaft seat 312. The shaft seat 312 is rotationally connected to the switching groove 3111. Rotating shafts 316 are respectively arranged on both sides of the carrier plate 315. A shaft hole 3121 is provided on the shaft seat 312, and the rotating shaft 316 is inserted into the shaft hole 3121, and the rotating shaft 316 is rotationally connected to the shaft hole 3121.

[0031] By setting the shaft seat 312, the shaft hole 3121 thereon is used to rotationally support the rotating shaft 316. The carrier plate 315 is supported at both ends by the two rotating shafts 316. Through the movable connection, the workpiece 5 and the carrier plate 315 are deflected together under force, preventing the impurities washed out from redepositing on the surface of the workpiece 5 under the action of gravity.

[0032] Further, reset grooves 3122 are respectively provided on both sides of the shaft hole 3121. Pressure regulating springs 317 are respectively arranged in the two reset grooves 3122. A transmission plate 314 is provided on the rotating shaft 316. One ends of the two pressure regulating springs 317 away from the reset grooves 3122 are respectively fixedly connected to the side walls of both sides of the transmission plate 314, and the elastic coefficients of the two pressure regulating springs 317 are different.

[0033] By setting the reset grooves 3122, the two pressure regulating springs 317 are installed. When the workpiece 5 swings together with the carrier plate 315, it will drive the pressure regulating springs 317 on both sides to stretch or compress, thereby assisting in resetting, reducing the swing amplitude, increasing the swing rate, and thus improving the cleaning efficiency. At the same time, by setting two pressure regulating springs 317 with different elastic coefficients, the workpiece 5 is arranged non-levelly in the initial state, which is convenient for improving the swing response efficiency.

[0034] Further, the alignment component 31 further includes an alignment motor 313. The alignment motor 313 is fixedly connected to the middle support plate 311, and the output end of the alignment motor 313 is drivingly connected to the shaft seat 312; Initially: The jet pipe 32, the bluff body 33, and the workpiece 5 are arranged along the conveying direction of the conveying chain 21. The pressure regulating spring 317 with a large elastic coefficient is located above the pressure regulating spring 317 with a small elastic coefficient, and one end of the workpiece 5 far from the rotating shaft 316 is tilted upward; During commutation: The arrangement directions of the jet pipe 32, the bluff body 33, and the workpiece 5 are opposite to the conveying direction of the conveying chain 21. The pressure regulating spring 317 with a large elastic coefficient is located below the pressure regulating spring 317 with a small elastic coefficient, and one end of the workpiece 5 far from the rotating shaft 316 is tilted downward.

[0035] When cleaning the surface of the workpiece 5, it is divided into two stages, namely the initial cleaning stage and the cleaning stage after commutation. Initially, the liquid outlet direction of the jet pipe 32 is opposite to the conveying direction of the conveying chain here, so as to drive the workpiece 5 in this stage to swing under the action of the vortex street; during commutation, the alignment motor 313 outputs torque, which is successively transmitted through the shaft seat 312, the pressure regulating spring 317, the transmission plate 314, the rotating shaft 316, and the carrier plate 315 to drive the workpiece 5 to flip 180°. The jet pipes 32 in both stages simultaneously eject high-pressure fluid to form a vortex and impact the surface of the workpiece 5 in an inclined state, so that the deflection directions of the two workpieces 5 are the same, and the generated vortex impacts and dissipates between the two workpieces 5, improving the disorder of the local fluid movement, thereby improving the multi-directional cleaning quality of the workpiece 5 with an asymmetric surface.

[0036] Further, the collection device 4 includes a collection box 41 and a reflux pump 42. The inlet of the reflux pump 42 is in pipeline communication with the cleaning chamber 11, and the outlet of the reflux pump 42 is in pipeline communication with the collection box 41.

[0037] By setting the reflux pump 42, when the reflux pump 42 is started, the inlet end is in a low-pressure state and is in communication with the cleaning chamber 11, so that the volatilized solvent enters the collection box 41 through the reflux pump 42, preventing the solvent from diffusing and the concentration from decreasing, which affects the continuous cleaning efficiency.

[0038] As an optimization, the collection device 4 further includes a refrigeration pipe 43. The collection box 41 is provided with a refrigeration chamber. The refrigeration pipe 43 is placed in the refrigeration chamber. The liquid outlet is arranged at the lower end of the refrigeration chamber, and the liquid outlet of the refrigeration chamber is in pipeline communication with the cleaning chamber 11. The volatilized solvent pumped into the refrigeration chamber is cooled through the refrigeration pipe 43, re-liquefied, and re-enters the cleaning chamber 11 through the lower liquid outlet, which helps to ensure the uniform solvent concentration.

[0039] As an optimization, the conveying device 2 further includes a driving motor 23. The driving motor 23 is fixedly connected to the cleaning tank 1, and the output end of the driving motor 23 is in transmission connection with the sprocket 22. The housing of the driving motor 23 is fixed on the cleaning tank 1, and the output torque drives the sprocket 22 to rotate, thereby driving the conveying chain 21 to perform a rotary motion.

[0040] As an optimization, a transmission shaft is provided between two sprockets 22 with coincident axes. By providing the transmission shaft, the two sprockets 22 with coincident axes rotate synchronously, improving the feeding stability.

[0041] The working principle of the present invention: The jet pipe 32 is connected to high-pressure fluid and jets towards the bluff body 33. The bluff body 33 plays a flow-blocking role and is a non-streamlined body, such as a cylinder, a sphere, etc. When the high-pressure fluid flows through the bluff body 33, flow separation is formed on its boundary, and vortices are generated at the rear. The irregular surface of the workpiece 5 is automatically cleaned through the vortices, improving the cleaning quality. By the high-pressure fluid flowing through both sides of the bluff body 33, since the instantaneous velocities of the fluids on both sides of the bluff body are different, the instantaneous pressures generated are also different, forming alternating eddies, thereby cleaning both sides of the workpiece simultaneously and improving the cleaning efficiency; by providing two pressure-regulating springs 317 with different elastic coefficients, the workpiece 5 is arranged non-level in the initial state, facilitating improving the swing response efficiency; the jet pipes 32 in two stages simultaneously eject high-pressure fluid to form vortices, which impact the surface of the workpiece 5 in an inclined state, making the deflection directions of the two workpieces 5 the same. The generated vortices impact and disperse between the two workpieces 5, increasing the disorderliness of the local fluid motion, thereby improving the multi-directional cleaning quality of the workpiece 5 with an asymmetric surface.

[0042] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A SMT patch cleaning device to avoid solvent volatilization, characterized in that: The cleaning device comprises a cleaning box (1), a conveying device (2), an adjusting device (3) and a collecting device (4); the conveying device (2) is connected to the cleaning box (1), the adjusting device (3) is connected to the conveying device (2), the collecting device (4) is firmly connected to the cleaning box (1), a cleaning chamber (11) is provided on the cleaning box (1), and the collecting device (4) and the cleaning chamber (11) are connected by a pipeline; The regulating device (3) comprises a direction adjustment component (31), a jet tube (32) and a blunt body (33); the direction adjustment component (31) comprises a middle support plate (311) and a carrier plate (315); a switching groove (3111) is provided on the middle support plate (311); the carrier plate (315) is placed in the switching groove (3111); the carrier plate (315) and the switching groove (3111) are movably connected; the jet tube (32) and the blunt body (33) are respectively fastened to the carrier plate (315); a clamping groove is provided on the carrier plate (315); the carrier plate (315) fixes the workpiece (5) through the clamping groove; the outlet of the jet tube (32) faces the blunt body (33); the jet tube (32), the blunt body (33) and the workpiece (5) are arranged in sequence.

2. The SMT patch cleaning device for avoiding solvent volatilization according to claim 1, characterized in that: The conveying device (2) comprises a conveying chain (21) and a sprocket (22); a chain groove (12) is provided on the cleaning box (1); the sprocket (22) and the chain groove (12) are rotatably connected; the sprocket (22) and the conveying chain (21) are chain-driven; and the conveying chain (21) is connected to the adjusting device (3); The direction adjustment component (31) is provided with a plurality of components along the conveying chain (21), the conveying chain (21) is provided with two groups, and the two sides of the middle support plate (311) are respectively firmly connected to the conveying chain (21).

3. The SMT patch cleaning device for avoiding solvent volatilization according to claim 2, characterized in that: The direction adjustment assembly (31) further comprises an axle seat (312), the axle seat (312) and the switching slot (3111) being rotatably connected, a rotating shaft (316) is respectively provided on both sides of the carrier plate (315), an axle hole (3121) is provided on the axle seat (312), the rotating shaft (316) is inserted into the axle hole (3121), and the rotating shaft (316) and the axle hole (3121) are rotatably connected.

4. The SMT patch cleaning device for avoiding solvent volatilization according to claim 3 is characterized in that: Reset grooves (3122) are respectively provided on both sides of the shaft hole (3121), and pressure regulating springs (317) are respectively provided in the two reset grooves (3122). A transmission plate (314) is provided on the rotating shaft (316), and the two pressure regulating springs (317) are respectively fastened to the wall surfaces on both sides of the transmission plate (314) at one end away from the reset grooves (3122), and the two pressure regulating springs (317) have different elastic coefficients.

5. The SMT patch cleaning device for avoiding solvent volatilization according to claim 4, characterized in that: The steering assembly (31) further comprises a steering motor (313), wherein the steering motor (313) and the middle support plate (311) are fastened together, and an output end of the steering motor (313) is drivingly connected to the shaft seat (312); Initially: the jet tube (32), the bluff body (33) and the workpiece (5) are arranged along the conveying direction of the conveyor chain (21), the pressure regulating spring (317) with a large elastic coefficient is located on the upper side of the pressure regulating spring (317) with a small elastic coefficient, and the end of the workpiece (5) away from the rotating shaft (316) is tilted upward; During reversal: the arrangement direction of the jet tube (32), the bluff body (33) and the workpiece (5) is opposite to the conveying direction of the conveyor chain (21); the pressure regulating spring (317) with a large elastic coefficient is located below the pressure regulating spring (317) with a small elastic coefficient; and the end of the workpiece (5) away from the rotating shaft (316) is tilted downward.

6. The SMT patch cleaning device for avoiding solvent volatilization according to claim 5, characterized in that: The collecting device (4) comprises a collecting box (41) and a reflux pump (42); an inlet of the reflux pump (42) is connected to a pipeline of the cleaning chamber (11); and an outlet of the reflux pump (42) is connected to a pipeline of the collecting box (41).

7. The SMT patch cleaning device for avoiding solvent volatilization according to claim 6, characterized in that: The collecting device (4) further comprises a refrigeration pipe (43), a refrigeration cavity is provided on the collecting box (41), the refrigeration pipe (43) is placed in the refrigeration cavity, a liquid outlet is provided at the lower end of the refrigeration cavity, and the liquid outlet of the refrigeration cavity is connected to the cleaning cavity (11) through a pipeline.

8. The SMT patch cleaning device for avoiding solvent volatilization according to claim 7, characterized in that: The conveying device (2) further comprises a driving motor (23), wherein the driving motor (23) is firmly connected to the cleaning box (1), and an output end of the driving motor (23) is drivingly connected to the sprocket (22).

9. The SMT patch cleaning device for avoiding solvent volatilization according to claim 8, characterized in that: A transmission shaft is provided between the two sprockets (22) whose axes coincide with each other.

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