An SMT patch cleaning device that avoids solvent volatilization

Abstract

The present invention discloses an SMT patch cleaning device for avoiding solvent volatilization, which relates to the field of cleaning technology. The cleaning device includes 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, and the collecting device is tightly connected to the cleaning box. The cleaning box is provided with a cleaning cavity, and the collecting device is connected to the cleaning cavity pipeline. The cleaning box serves as the main installation base for installing other devices and provides a cleaning space through the cleaning cavity. The conveying device is used to convey the workpiece, and the cleaning angle of the workpiece is adjusted by the adjusting device, so as to perform cleaning without dead angles. Negative pressure is created by the collecting device, 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.

Description

Technical Field

[0001] The present 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, placement, curing, reflow soldering, testing, and rework. Among them, the cleaning process is mainly to remove solder residue and other debris in the gaps between the patches, 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 the temperature to rise, 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. They have poor cleaning effects on 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 that 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:

[0007] The cleaning device includes 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.

[0008] The cleaning box serves as the main installation base for installing other devices and provides cleaning space through the cleaning chamber. The conveying device is used to convey the workpiece, and the cleaning angle of the workpiece is adjusted through the adjustment device, so as to perform cleaning without dead angles. Negative pressure is created through the collection 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.

[0009] 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;

[0010] The adjusting device includes a direction adjustment component, a jet tube and a blunt body. The direction adjustment component is provided with several components along the conveyor chain. The direction adjustment component includes a middle supporting plate and a carrier plate. The conveyor chain is provided with two groups. The two sides of the middle supporting plate are respectively fastened to the conveyor chain. A switching groove is provided on the middle supporting plate. The carrier plate is placed in the switching groove. The carrier plate and the switching groove are movably connected. The jet tube and the blunt body are respectively fastened to the carrier plate. A card slot is provided on the carrier plate. The carrier plate fixes the workpiece through the card slot. The jet tube outlet faces the blunt body. The jet tube, blunt body and workpiece are arranged in sequence.

[0011] The sprockets are rotatably supported by chain grooves, and the chain drive causes the conveyor chains to rotate during the sprocket rotation. Several intermediate support plates are installed between the two conveyor chains. The intermediate support plates are mounted on the carrier plates through switching grooves, and the workpieces are fixed by slots on the carrier plates, thereby driving the workpieces to move. The conveyor chains consist of two parts: an upper part located above the liquid surface for loading, and a lower part immersed below the liquid surface for facilitating workpiece cleaning. A jet tube connects to the high-pressure fluid and sprays it toward a blunt body. The blunt body acts as a flow barrier and is a non-streamlined object, such as a cylinder or sphere. When the high-pressure fluid flows through the blunt body, flow separation forms at its boundary and vortices are generated at the rear. These vortices automatically clean irregular surfaces on the workpiece, improving cleaning quality. As the high-pressure fluid flows through both sides of the blunt body, the different instantaneous velocities and pressures of the fluid on both sides of the blunt body create alternating vortices, which simultaneously clean both sides of the workpiece, improving cleaning efficiency.

[0012] Furthermore, the direction adjustment component also includes an axle seat, which is rotatably connected to the switching slot. A rotating shaft is provided on both sides of the carrier plate, and an axle hole is provided on the axle seat. The rotating shaft is inserted into the axle hole, and the rotating shaft and the axle hole are rotatably connected.

[0013] By setting up an axle seat, the shaft hole on it is used to provide rotational support for the rotating shaft, and the carrier plate is supported at both ends by two rotating shafts. Through a movable connection, the workpiece and the carrier plate are deflected together by force, preventing the cleaned impurities from settling back on the workpiece surface under the action of gravity.

[0014] Furthermore, reset grooves are provided on both sides of the shaft hole, and pressure-adjusting springs are provided in the two reset grooves respectively. A transmission plate is provided on the rotating shaft, and the two pressure-adjusting springs are fastened to the walls on both sides of the transmission plate at one end away from the reset groove, and the two pressure-adjusting springs have different elastic coefficients.

[0015] By providing a reset groove and mounting two pressure-adjusting springs, when the workpiece swings with the carrier plate, the pressure-adjusting springs on both sides stretch or compress, thereby assisting in reset, reducing the swing amplitude and increasing the swing rate, thereby improving cleaning efficiency. Furthermore, by providing two pressure-adjusting springs with different elastic coefficients, the workpiece is initially positioned non-horizontally, which facilitates improved swing response efficiency.

[0016] Furthermore, the steering assembly further includes a steering motor, the steering motor is fastened to the center support plate, and the output end of the steering motor is transmission-connected to the shaft seat;

[0017] Initially: the jet tube, the bluff body, and the workpiece are arranged along the conveying direction of the conveyor chain, the pressure-regulating spring with a large elastic coefficient is located above the pressure-regulating spring with a small elastic coefficient, and the workpiece is tilted upward away from the rotating shaft.

[0018] During reversal: the arrangement direction of the jet tube, the bluff body and the workpiece is opposite to the conveying direction of the conveyor chain, the pressure regulating spring with a large elastic coefficient is located below the pressure regulating spring with a small elastic coefficient, and the workpiece is tilted downward away from the end of the rotating shaft.

[0019] The workpiece surface cleaning process is divided into two phases: the initial cleaning phase and the post-reversal cleaning phase. Initially, the direction of fluid discharge through the jet tubes is opposite to the conveyor chain's direction of transport, causing the workpieces within this phase to oscillate under the action of a vortex street. During reversal, the steering motor outputs torque, which is transmitted sequentially through the shaft seat, pressure-adjusting spring, transmission plate, rotating shaft, and carrier plate, causing the workpieces to flip 180°. The jet tubes in both phases simultaneously eject high-pressure fluid, forming vortices that impact the tilted workpiece surfaces, aligning the deflection directions of the two workpieces. The generated vortices collide and dissipate between the two workpieces, increasing the disorder of the local fluid motion and thus improving the multi-directional cleaning quality of workpieces with asymmetric surfaces.

[0020] Furthermore, the collecting device includes a collecting box and a reflux pump, the reflux pump inlet is connected to the cleaning chamber pipeline, and the reflux pump outlet is connected to the collecting box pipeline.

[0021] By setting up a reflux pump, when the reflux pump is started, the inlet end is in a low-pressure state and connected to the cleaning chamber, so that the volatilized solvent enters the collection box through the reflux pump, preventing the solvent from diffusing and reducing the concentration, which affects the continuous cleaning efficiency.

[0022] As an optimization, the collection device also includes a refrigeration tube. The collection box is provided with a refrigeration chamber, and the refrigeration tube is placed within the refrigeration chamber. A liquid outlet is provided at the lower end of the refrigeration chamber, and the outlet is connected to the cleaning chamber pipeline. The volatile solvent pumped into the refrigeration chamber is cooled by the refrigeration tube, re-liquefied, and re-entered the cleaning chamber through the liquid outlet at the lower end, helping to ensure uniform solvent concentration.

[0023] As an optimization, the conveying device also includes a drive motor, which is tightly connected to the cleaning box, and the output end of the drive motor is connected to the sprocket. The drive motor housing is fixed to the cleaning box, and the output torque drives the sprocket to rotate, thereby driving the conveyor chain to rotate.

[0024] As an optimization, a transmission shaft is provided between the two sprockets whose axes coincide with each other. By providing the transmission shaft, the two sprockets whose axes coincide with each other rotate synchronously, thereby improving the feeding stability.

[0025] Compared with the prior art, the present invention has the following advantages: a jet tube connects to a high-pressure fluid and sprays it toward a bluff body, which acts as a flow barrier and is a non-streamlined body such as a cylinder or sphere. When the high-pressure fluid flows through the bluff body, flow separation occurs at its boundary, generating a vortex at the rear. The vortex automatically cleans irregular surfaces of the workpiece, improving cleaning quality. As the high-pressure fluid flows through both sides of the bluff body, the different instantaneous velocities of the fluid on both sides of the bluff body generate different instantaneous pressures, forming alternating vortices that simultaneously clean both sides of the workpiece, improving cleaning efficiency. By providing two pressure-regulating springs with different elastic coefficients, the workpiece is initially arranged in a non-horizontal state, facilitating improved swing response efficiency. The jet tubes simultaneously spray high-pressure fluid in two stages, forming vortices that impact the inclined workpiece surface, causing the two workpieces to deflect in the same direction. The generated vortices collapse between the two workpieces, increasing the disorder of the local fluid motion and thus improving the multi-directional cleaning quality of workpieces with asymmetric surfaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic structural diagram of the collecting device of the present invention;

[0028] Figure 3 for Figure 2 A magnified view of a part A of the view;

[0029] Figure 4 This is a schematic diagram of multi-angle flushing of a workpiece according to the present invention;

[0030] Figure 5 for Figure 4 A magnified view of a detail B of the view;

[0031] Figure 6 It is a structural schematic diagram of the steering assembly of the present invention;

[0032] Figure 7 This is a schematic diagram of the reversing flushing power transmission of the present invention;

[0033] Figure 8 This is a schematic diagram of the solvent collection and cooling process of the present invention.

[0034] In the figure: 1. Cleaning box; 11. Cleaning chamber; 12. Chain groove; 2. Conveying device; 21. Conveying chain; 22. Sprocket; 23. Driving motor; 3. Adjusting device; 31. Adjusting assembly; 311. Middle supporting plate; 3111. Switching groove; 312. Shaft seat; 3121. Shaft hole; 3122. Reset groove; 313. Adjusting motor; 314. Transmission plate; 315. Carrier plate; 316. Rotating shaft; 317. Pressure-regulating spring; 32. Jet tube; 33. Blunt body; 4. Collecting device; 41. Collecting box; 42. Reflux pump; 43. Refrigeration pipe; 5. Workpiece. DETAILED DESCRIPTION

[0035] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0036] Example: Figures 1-8 As shown, the present invention provides a technical solution for an SMT patch cleaning device that avoids solvent volatilization.

[0037] 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, and 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.

[0038] 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.

[0039] Furthermore, the conveying device 2 includes a conveying chain 21 and a sprocket 22. The cleaning box 1 is provided with a chain groove 12. The sprocket 22 is rotatably connected to the chain groove 12. The sprocket 22 and the conveying chain 21 are chain-driven. The conveying chain 21 is connected to the adjusting device 3.

[0040] The adjusting device 3 includes a direction adjustment component 31, a jet tube 32 and a blunt body 33. The direction adjustment component 31 is provided with several components along the conveyor chain 21. The direction adjustment component 31 includes a middle support plate 311 and a carrier plate 315. The conveyor chain 21 is provided with two groups. The two sides of the middle support plate 311 are respectively fastened to the conveyor chain 21. 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 card slot is provided on the carrier plate 315. The carrier plate 315 fixes the workpiece 5 through the card slot. 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.

[0041] The chain slot 12 provides rotational support for the sprocket 22. The chain drive causes the sprocket 22 to rotate, driving the conveyor chain 21 in a rotary motion. A plurality of intermediate support plates 311 are disposed between the two conveyor chains. The intermediate support plates 311 are mounted on the carrier plates 315 via switching slots 3111, and the workpieces are secured via slots on the carrier plates 315, thereby driving the workpieces. The conveyor chain 21 comprises two parts: an upper portion positioned above the liquid surface for loading, and a lower portion submerged below the liquid surface for facilitating cleaning of the workpieces 5. A jet tube 32 connects to the high-pressure fluid and sprays it toward a bluff body 33. The bluff body 33 acts as a flow barrier and is a non-streamlined object, such as a cylinder or sphere. When the high-pressure fluid flows through the bluff body 33, flow separation occurs at its boundaries, generating a vortex at the rear. This vortex automatically cleans the irregular surfaces of the workpiece 5, improving cleaning quality. When the high-pressure fluid flows through both sides of the bluff body 33, the instantaneous pressure generated is different due to the different instantaneous velocities of the fluid on both sides of the bluff body, forming alternating vortices, thereby cleaning both sides of the workpiece simultaneously and improving the cleaning efficiency.

[0042] Furthermore, the direction adjustment component 31 also includes an axle seat 312, which is rotatably connected to the switching slot 3111. A rotating shaft 316 is provided on both sides of the carrier plate 315. An axle hole 3121 is provided on the axle seat 312, and the rotating shaft 316 is inserted into the axle hole 3121. The rotating shaft 316 and the axle hole 3121 are rotatably connected.

[0043] By setting up the shaft seat 312, the shaft hole 3121 thereon is used to rotatably support the rotating shaft 316, and the two rotating shafts 316 are used to support the carrier plate 315 at both ends. Through the movable connection, the workpiece 5 and the carrier plate 315 are deflected together by force, preventing the cleaned impurities from settling back on the surface of the workpiece 5 under the action of gravity.

[0044] Furthermore, reset grooves 3122 are respectively provided on both sides of the shaft hole 3121, and pressure-adjusting 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-adjusting 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-adjusting springs 317 have different elastic coefficients.

[0045] By providing a reset groove 3122 and mounting two pressure-adjusting springs 317, when the workpiece 5 swings along with the carrier plate 315, the pressure-adjusting springs 317 on either side stretch or compress, thereby assisting in reset, reducing the swing amplitude and increasing the swing rate, thereby improving cleaning efficiency. Furthermore, by providing two pressure-adjusting springs 317 with different elastic coefficients, the workpiece 5 is initially positioned non-horizontally, thereby improving the swing response efficiency.

[0046] Furthermore, the steering assembly 31 further includes a steering motor 313, the steering motor 313 is fastened to the center support plate 311, and the output end of the steering motor 313 is transmission-connected to the shaft seat 312;

[0047] 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 above 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;

[0048] 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 workpiece 5 is tilted downward away from the rotating shaft 316.

[0049] The cleaning process for the surface of workpiece 5 is divided into two phases: an initial cleaning phase and a post-reversal cleaning phase. Initially, the direction of fluid discharge through jet tube 32 is opposite to the conveying direction of the conveyor chain, causing the workpiece 5 within this phase to oscillate under the action of a vortex street. During reversal, the torque output by the reversing motor 313 is sequentially transmitted through the shaft seat 312, pressure-adjusting spring 317, transmission plate 314, rotating shaft 316, and carrier plate 315, causing the workpiece 5 to flip 180°. In both phases, jet tube 32 simultaneously ejects high-pressure fluid, forming vortices that impact the tilted surfaces of workpiece 5, causing the two workpieces 5 to deflect in the same direction. The generated vortices collide and dissipate between the two workpieces 5, increasing the disorder of the local fluid motion and thus improving the multi-directional cleaning quality of workpieces 5 with asymmetric surfaces.

[0050] Furthermore, the collecting device 4 includes a collecting box 41 and a reflux pump 42 . The inlet of the reflux pump 42 is connected to the cleaning chamber 11 through a pipeline, and the outlet of the reflux pump 42 is connected to the collecting box 41 through a pipeline.

[0051] By setting up the reflux pump 42, when the reflux pump 42 is started, the inlet end is in a low-pressure state and is connected to 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 reducing the concentration, which affects the continuous cleaning efficiency.

[0052] As an optimization, collection device 4 also includes a refrigeration tube 43. Collection box 41 is provided with a refrigeration chamber, within which refrigeration tube 43 is placed. A liquid outlet is provided at the lower end of the refrigeration chamber, which is connected to cleaning chamber 11 through a pipe. The volatile solvent pumped into the refrigeration chamber is cooled by refrigeration tube 43, reliquefied, and re-enters cleaning chamber 11 through the lower outlet, helping to ensure uniform solvent concentration.

[0053] As an optimization, the conveying device 2 further includes a drive motor 23, which is firmly connected to the cleaning box 1, and the output end of the drive motor 23 is in transmission connection with the sprocket 22. The housing of the drive motor 23 is fixed to the cleaning box 1, and the output torque drives the sprocket 22 to rotate, thereby driving the conveying chain 21 to perform a rotary motion.

[0054] As an optimization, a transmission shaft is provided between the two sprockets 22 whose axes coincide with each other. By providing the transmission shaft, the two sprockets 22 whose axes coincide with each other rotate synchronously, thereby improving the feeding stability.

[0055] The present invention operates as follows: a jet tube 32 connects to a high-pressure fluid and sprays it toward a bluff body 33. The bluff body 33 acts as a flow barrier and is a non-streamlined object, such as a cylinder or sphere. When the high-pressure fluid flows through the bluff body 33, flow separation occurs at its boundaries, generating vortices at its rear. These vortices automatically clean the irregular surfaces of the workpiece 5, improving cleaning quality. As the high-pressure fluid flows through both sides of the bluff body 33, the different instantaneous velocities and pressures of the fluid on each side of the bluff body create alternating vortices, simultaneously cleaning both sides of the workpiece and improving cleaning efficiency. By providing two pressure-regulating springs 317 with different elastic coefficients, the workpiece 5 is initially positioned non-horizontally, improving swing response efficiency. The jet tube 32 simultaneously sprays high-pressure fluid in two stages, forming vortices that impact the tilted surface of the workpiece 5, causing the two workpieces 5 to deflect in the same direction. The generated vortices then collapse between the two workpieces, increasing the disorder of the local fluid motion and thus improving the multi-directional cleaning quality of workpieces 5 with asymmetric surfaces.

[0056] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An SMT patch cleaning device that avoids solvent volatilization, characterized by: 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 a pipeline of the collecting device (4) and the cleaning chamber (11) is connected; 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 supporting plate (311) and a carrier plate (315); 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 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; The blunt body (33) is a cylinder; The collecting device (4) comprises a collecting box (41) and a reflux pump (42), wherein the inlet of the reflux pump (42) is connected to a pipeline of the cleaning chamber (11), and the outlet of the reflux pump (42) is connected to a pipeline of the collecting box (41); 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 direction adjustment component (31) is provided with a plurality of components along the conveyor chain (21), and the conveyor chain (21) is provided with two groups, and both sides of the middle support plate (311) are respectively fastened to the conveyor chain (21); 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) pipeline.

2. The SMT patch cleaning device for avoiding solvent volatilization according to claim 1, characterized in that: The direction adjustment assembly (31) further comprises an axle seat (312), wherein the axle seat (312) and the switching slot (3111) are rotatably connected, a rotating shaft (316) is respectively provided on both sides of the carrier plate (315), a shaft hole (3121) is provided on the axle seat (312), the rotating shaft (316) is inserted into the shaft hole (3121), and the rotating shaft (316) and the shaft hole (3121) are rotatably connected.

3. The SMT patch cleaning device for avoiding solvent volatilization according to claim 2, 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 groove (3122), and the two pressure regulating springs (317) have different elastic coefficients.

4. The SMT patch cleaning device for avoiding solvent volatilization according to claim 3, characterized in that: The steering assembly (31) further includes a steering motor (313), the steering motor (313) and the center support plate (311) are fastened together, and the output end of the steering motor (313) is transmission-connected to the shaft seat (312); Initially: the jet tube (32), the blunt 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 above the pressure regulating spring (317) with a small elastic coefficient, and the workpiece (5) is tilted upward at one end away from the rotating shaft (316); 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 workpiece (5) is tilted downward at one end away from the rotating shaft (316).

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

6. The SMT patch cleaning device for avoiding solvent volatilization according to claim 5, characterized in that: A transmission shaft is provided between the two sprockets (22) whose axes coincide with each other.

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