Oscillation type self-cleaning circuit board etching device and method

Abstract

The invention relates to the technical field of circuit board production, in particular to an oscillation type self-cleaning circuit board etching device and method.The device comprises a base, a cleaning barrel is arranged on the upper side of the base, an oscillation assembly is arranged between the base and the cleaning barrel, a movable block is arranged on the oscillation assembly, and sliding rods are slidably connected to the four corners of the movable block; the bottom face of the sliding rod is fixedly connected with the top face of the base, the peripheral wall of the lower end of the sliding rod is sleeved with a first spring, the top face of the movable block is fixedly connected with two supporting blocks, a protruding block is arranged between the two supporting blocks, the middle of the protruding block is sleeved with a rotating shaft, and the peripheral wall of the rotating shaft is rotationally connected with the two supporting blocks. The movable block drives the rotating column and the cleaning barrel to move synchronously, so that the etching liquid and the circuit board in the cleaning barrel fluctuate, the etching liquid can be more uniformly distributed on the surface of the circuit board, the oscillation effect in the etching process is enhanced, the oscillation continuity and stability are ensured, and the self-cleaning use of circuit board etching is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of circuit board production, in particular to an oscillating self-cleaning circuit board etching device and method. Background Art

[0002] In the field of circuit board processing technology, especially in the etching process involving CNC integrated circuit boards, how to effectively clean impurities on the surface of the circuit board is the key to improving the etching effect and circuit board processing quality. Traditional etching methods often use static etching, that is, the circuit board is fixed and the etching liquid contacts the circuit board by spraying or immersion; After searching, the Chinese patent with the announcement number CN114793392A provides a digital control integrated circuit board oscillation self-cleaning etching device, which is convenient for putting the circuit board in a dynamic etching state, avoiding the influence of impurities dropped by the etching of the circuit board on the circuit board, and making it convenient for impurities to quickly leave the circuit board, thereby improving the etching effect. At the same time, the flowing solution can be in uniform and comprehensive contact with the circuit board, so as to make it convenient to keep the corrosion degree of the circuit board surface consistent and improve the processing quality of the circuit board; However, it was found during use that the oscillation mode was relatively single and could not meet the diverse oscillation requirements under different circuit board materials, sizes and etching requirements. The control of the oscillation strength and amplitude was not flexible enough, and it was difficult for operators to make precise adjustments according to actual needs. This not only affected the etching effect, but also caused energy waste and increased costs due to inappropriate oscillation parameters, which was not conducive to the self-cleaning use of circuit board etching. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an oscillating self-cleaning circuit board etching device and method, in which a movable block drives a rotating column and a cleaning barrel to move synchronously, causing the etching liquid and the circuit board in the cleaning barrel to fluctuate, which helps the etching liquid to be more evenly distributed on the surface of the circuit board, enhances the oscillation effect during the etching process, ensures the continuity and stability of the oscillation, and facilitates the self-cleaning use of circuit board etching.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: an oscillating self-cleaning circuit board etching device, comprising a base, a cleaning bucket is provided on the upper side of the base, an oscillating assembly is provided between the base and the cleaning bucket, a movable block is provided on the oscillating assembly, and sliding rods are slidably connected to the four corners of the movable block, the bottom surface of the sliding rod is fixedly connected to the top surface of the base, a first spring is sleeved on the outer peripheral wall of the lower end of the sliding rod, two supporting blocks are fixedly connected to the top surface of the movable block, a convex block is provided between the two supporting blocks, a rotating shaft is sleeved in the middle of the convex block, and the outer peripheral wall of the rotating shaft is rotatably connected to the two supporting blocks respectively; A positioning block is fixedly provided on the bottom surface of the middle part of the movable block, and a rotating wheel is rotatably connected to the lower end of the positioning block. The outer peripheral wall of the rotating wheel abuts against the outer peripheral wall of the protrusion. A rotating column is fixedly provided on the bottom surface of the cleaning barrel, and a limiting ring is fixedly provided on the outer peripheral wall of the lower end of the rotating column. The limiting ring is located inside the movable block, and the lower end of the rotating column and the limiting ring are rotatably connected to the middle part of the movable block respectively.

[0005] Preferably, the top surface of the first spring is fixedly connected to the bottom surface of the movable block, the bottom surface of the first spring is fixedly connected to the top surface of the base, the top surface of the movable block is mounted with a first servo motor via a mounting seat, and the output shaft of the first servo motor is connected to the rotating shaft.

[0006] Through the above technical solution, through the restoring force of the first spring and the weight of the cleaning barrel, the movable block moves downward quickly when the inner recess of the protrusion contacts the outer peripheral wall of the rotating wheel, thereby improving the contact effect between the protrusion and the rotating wheel.

[0007] Preferably, a worm wheel is sleeved on the outer peripheral wall of the middle part of the rotating column, a worm is meshingly connected to the worm wheel, two ends of the worm are rotatably connected to fixed blocks, and the bottom surface of the fixed block is fixedly connected to the top surface of the movable block.

[0008] Through the above technical solution, the worm wheel rotates along the fixed block, and the worm meshes and transmits to the worm wheel to rotate, so that the worm wheel drives the rotating column and the limiting ring to rotate along the movable block, driving the cleaning barrel to rotate.

[0009] Preferably, a first cylinder is installed on the outer wall of the movable block through a mounting seat, two grooves are provided on the movable block, a push block is slidably connected to the outer wall of the movable block, two clamping blocks are fixed on the push block, the clamping blocks are slidably connected to the grooves, a second spring is fixed on the side wall of the clamping block, and the piston rod of the first cylinder is fixedly connected to the second spring.

[0010] Through the above technical solution, the second spring provides elasticity and buffering effect for the sliding of the push block, reducing the risk of damage to the belt due to excessive tension or relaxation.

[0011] Preferably, the outer peripheral wall of the rotating shaft is rotatably connected with a connecting block, and the connecting block is fixedly arranged on the top surface of the base, the rotating shaft and the worm are respectively sleeved with a first pulley, and the pushing block is rotatably connected with a second pulley, the wheel grooves of the two first pulleys are respectively in frictional contact with the second pulley through belts, and the outer sides of the first pulley and the second pulley are respectively provided with limit rods, and gaps are left between the limit rods and the first pulley and the second pulley respectively, the limit rod located on the outer side of one of the first pulleys is installed on the outer wall of one of the fixed blocks, the other limit rod on the outer side of the first pulley is installed on the outer wall of the connecting block, and the limit rod located on the outer side of the second pulley is installed on the pushing block.

[0012] Through the above technical solution, the push block is pushed to slide along the movable block, the clamping block slides along the groove, the push block drives the second pulley to move along the axial direction of the piston rod, and the belt is adaptively adjusted as the movable block moves up and down.

[0013] Preferably, the lower end of the inner wall of the cleaning barrel is in an inclined structure, the lower end of the cleaning barrel is connected to a drain pipe with a valve, the lower end of the inner wall of the cleaning barrel is sleeved with a retaining ring, a circulating pump is installed on the outer wall of the cleaning barrel through a mounting seat, the water inlet end of the circulating pump is connected to a suction pipe, the upper end of the suction pipe is connected to the interior of the cleaning barrel, the water outlet end of the circulating pump is connected to a liquid outlet pipe, the liquid outlet pipe is located at the lower end of the interior of the cleaning barrel, and the top surface of the liquid outlet pipe is in a uniformly arranged structure with multiple liquid outlet holes.

[0014] Through the above technical solution, the circulating etching liquid flushes the surface of the circuit board more evenly, removing impurities and residues attached to the circuit board.

[0015] Preferably, it also includes a feeding component, which is provided with a column, which is fixed on the top surface of the base, and the top surface of the column is rotatably connected to a circular shaft, and the top surface of the circular shaft is fixed with a cross block, and a plurality of second cylinders are installed at the edge of the top surface of the cross block, and the piston rod of the second cylinder passes through the cross block and extends to the lower end, and a pneumatic finger is installed on the bottom surface of the piston rod of the cross block through a mounting seat, and the inner wall of the finger end of the pneumatic finger is in an arc shape.

[0016] Preferably, a hollow barrel is inserted into the cleaning barrel, the bottom surface of the hollow barrel abuts against the top surface of the retaining ring, a connecting rod is fixed inside the upper end of the hollow barrel, a frustum is fixed in the middle of the connecting rod, and the finger end of the pneumatic finger is adapted to the outer peripheral wall of the frustum.

[0017] Through the above technical solution, the inner wall of the finger end of the pneumatic finger is in an arc shape, so that it is tightly engaged with the outer wall of the truncated table, reducing shaking and ensuring the stability and accuracy of the hollow barrel during the placement process.

[0018] Preferably, a groove wheel is fixedly provided on the outer peripheral wall in the middle of the circular shaft, a turntable is slidably connected to the inner arc of the groove wheel, a plurality of radial grooves are opened on the groove wheel, a rotating pin is fixedly provided on the turntable, the outer peripheral wall of the rotating pin is slidably connected to the radial groove wall, a second servo motor is installed on the upper end of the column through a mounting seat, the turntable is sleeved on the output shaft of the second servo motor, and the top surfaces of the turntable and the groove wheel respectively leave gaps with the bottom surface of the cross block.

[0019] Through the above technical solution, the turntable and the rotating pin are driven to rotate through the output shaft of the second servo motor, so that the outer peripheral wall of the turntable and the inner arc of the groove wheel slide, and the rotating pin and one of the radial grooves of the groove wheel slide, pushing the groove wheel to rotate 90 degrees, and rotating the hollow barrel containing the circuit board to be etched to above the cleaning barrel.

[0020] A method for an oscillating self-cleaning circuit board etching device comprises the following steps: Initial oscillation: First, place the circuit board to be etched in the cleaning bucket, make sure that the circuit board is completely immersed in the etching liquid, and drive the protrusion to rotate through the rotating shaft. Since the outer peripheral wall of the protrusion abuts against the rotating wheel, the rotating wheel will swing up and down, and then drive the movable block to slide along the sliding rod. At this time, the movable block drives the rotating column and the cleaning bucket to move synchronously, causing the etching liquid and circuit board in the cleaning bucket to fluctuate, and preliminarily clean the impurities on the surface of the circuit board.

[0021] Oscillate again: while the first servo motor drives the rotating shaft to rotate, one of the first pulleys is driven to rotate, and the other pulley is driven to rotate through the belt friction, so that the worm wheel rotates along the fixed block, and the worm meshing transmission is driven to the worm wheel to rotate, so that the worm wheel drives the rotating column and the limit ring to rotate along the movable block, and drives the cleaning barrel to rotate. At this time, the force of the protrusion and the worm wheel makes the cleaning barrel shake up and down and rotate to produce oscillation, which fully oscillates the circuit board inside the cleaning barrel and cleans the circuit board.

[0022] Oscillation adjustment: By adjusting the telescopic length of the piston rod of the cylinder, the push block is pushed to slide along the movable block, the clamping block is made to slide along the groove, and the push block drives the second pulley to move along the axial direction of the piston rod, so that the belt is adaptively adjusted as the movable block moves up and down. When the cleaning barrel does not need to rotate, the belt is pushed to reduce the friction with the second pulley, so that the first pulley on the worm stops rotating, the rotation of the cleaning barrel is controlled, and the oscillation intensity is adjusted.

[0023] Solvent circulation: The etching liquid in the upper end of the cleaning barrel is extracted by sucking the suction pipe through the circulation pump, and then discharged upward to the lower end of the cleaning barrel through the liquid outlet pipe and multiple liquid outlet holes, so that the etching liquid in the cleaning barrel circulates.

[0024] Circuit board conveying material: before cleaning, place the circuit board to be etched inside one of the hollow barrels, and drive the turntable and the rotating pin to rotate through the output shaft of the second servo motor, so that the outer peripheral wall of the turntable slides with the inner arc of the groove wheel, and the rotating pin slides with one of the radial grooves of the groove wheel, pushing the groove wheel to rotate 90 degrees, and rotating the hollow barrel with the circuit board to be etched to the top of the cleaning barrel, and the piston rod of the second cylinder moves downward to make the corresponding pneumatic finger drive the hollow barrel into the cleaning barrel, and after the corresponding pneumatic finger is separated from the round table, the pneumatic finger is driven to move upward by the piston rod of the corresponding second cylinder, and then the vibration cleaning is carried out through the vibration component. After completion, the corresponding pneumatic finger clamps the round table to separate the hollow barrel from the cleaning barrel, and the cleaned circuit board is taken out by rotating the groove wheel again, and at the same time, a new circuit board to be etched is placed in the cleaning barrel for cleaning operation.

[0025] Beneficial effects of the present invention: 1. Place the circuit board to be etched in the cleaning bucket to ensure that the circuit board is completely immersed in the etching liquid. The protrusion is driven to rotate by the rotating shaft. Since the outer peripheral wall of the protrusion is in contact with the rotating wheel, the rotating wheel will swing back and forth up and down, thereby driving the movable block to slide along the slide rod, so that the first spring is compressed or stretched by the movable block. Through the restoring force of the first spring and the weight of the cleaning bucket, the movable block moves downward quickly when the concave part of the protrusion contacts the outer peripheral wall of the rotating wheel, thereby improving the contact effect between the protrusion and the rotating wheel. At this time, the movable block drives the rotating column and the cleaning bucket to move synchronously, so that the etching liquid and the circuit board in the cleaning bucket fluctuate, which helps the etching liquid to be more evenly distributed on the surface of the circuit board, enhances the vibration effect during the etching process, ensures the continuity and stability of the vibration, and facilitates the self-cleaning use of circuit board etching.

[0026] 2. The first servo motor drives the rotating shaft to rotate, and at the same time, drives one of the first pulleys to rotate, and transmits the belt friction to the other pulley to rotate, so that the worm wheel rotates along the fixed block, and the worm meshing transmission transmits the worm wheel to rotate, so that the worm wheel drives the rotating column and the limit ring to rotate along the movable block, and drives the cleaning barrel to rotate. At this time, the force of the protrusion and the worm wheel makes the cleaning barrel shake up and down and rotate to produce vibration, which fully vibrates the circuit board inside the cleaning barrel and cleans the circuit board. By adjusting the frequency, amplitude and rotation speed of the vibration, it can adapt to circuit boards of different materials, sizes and etching requirements.

[0027] 3. By adjusting the telescopic length of the piston rod of the cylinder, the push block is pushed or pulled to move by the second spring, and the movable push block slides along the movable block, so that the clamping block slides along the groove, and the push block drives the second pulley to move along the axial direction of the piston rod, so that the belt is adaptively adjusted as the movable block moves up and down. The limit rods are respectively arranged on the outside of the first pulley and the second pulley, and gaps are left between the first pulley and the second pulley respectively, thereby reducing the occurrence of belt shedding or transmission failure. When the cleaning barrel does not need to rotate, the push belt reduces the friction with the second pulley, so that the first pulley on the worm stops rotating, and the rotation of the cleaning barrel is controlled to achieve precise control of the oscillation intensity. The second spring provides elasticity and buffering for the sliding of the push block, thereby reducing the risk of damage to the belt due to excessive tension or relaxation.

[0028] 4. The etching liquid in the upper end of the cleaning barrel is sucked out by the suction pipe through the circulation pump, and then discharged upward to the lower end of the cleaning barrel through the liquid outlet pipe and multiple liquid outlet holes, so that the etching liquid in the cleaning barrel circulates and reduces the waste of etching liquid. The circulating etching liquid more evenly flushes the surface of the circuit board, removes impurities and residues attached to the circuit board, and improves the cleaning effect; the lower end of the cleaning barrel is connected to a drain pipe with a valve, and the impurities after vibration slide along the inclined part of the lower end of the inner wall of the cleaning barrel to the drain pipe, which is convenient for discharging the etching liquid and impurities after cleaning.

[0029] 5. Place the circuit board to be etched inside one of the hollow barrels. The design of the hollow barrel allows the etching liquid to penetrate the barrel wall during the cleaning process and fully contact the circuit board. The output shaft of the second servo motor drives the turntable and the rotating pin to rotate, so that the outer peripheral wall of the turntable slides with the inner arc of the groove wheel, and the rotating pin slides with one of the radial grooves of the groove wheel, pushing the groove wheel to rotate 90 degrees. The hollow barrel containing the circuit board to be etched is rotated to the top of the cleaning barrel, and the piston rod of the second cylinder moves downward, so that the corresponding pneumatic finger drives the hollow barrel into the cleaning barrel. The inner wall of the finger end of the pneumatic finger is in an arc shape, so that it is tightly clamped with the outer wall of the truncated table to reduce shaking and ensure the stability and accuracy of the hollow barrel during placement.

[0030] 6. The pneumatic fingers are driven to move upward by the piston rod of the corresponding second cylinder, and then the vibration cleaning is performed through the vibration component. After the cleaning is completed, the corresponding pneumatic fingers clamp the round table to separate the hollow barrel from the cleaning barrel, and then the cleaned circuit board is taken out by rotating the groove wheel again. At the same time, the new circuit board to be etched is placed in the cleaning barrel for the next round of cleaning operation, which improves the work efficiency, ensures the stability and accuracy of the circuit board during the cleaning process, facilitates the placement and removal of the hollow barrel, and further improves the efficiency of taking and placing the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the movable block of the present invention; Figure 3 It is a schematic diagram of the positioning block structure of the present invention; Figure 4 It is a schematic diagram of the bump structure of the present invention; Figure 5 It is a schematic diagram of the worm gear structure of the present invention; Figure 6 It is a schematic diagram of the push block structure of the present invention; Figure 7 is a schematic diagram of a second spring structure of the present invention; Figure 8 This is a schematic diagram of the interior of the cleaning barrel structure of the present invention; Fig. 9 It is a schematic diagram of the structure of the material feeding assembly of the present invention; Fig.10 It is a schematic diagram of the structure of the turntable of the present invention; Fig.11 It is a schematic diagram of the sheave structure of the present invention; Fig.12 It is a schematic diagram of the assembly of the truncated cone structure of the present invention.

[0032] In the figure: 1. Base; 2. Cleaning bucket; 3. Oscillating assembly; 301. movable block; 302. sliding rod; 303. first spring; 304. supporting block; 305. convex block; 306. rotating shaft; 307. rotating wheel; 308. positioning block; 309. rotating column; 310. limiting ring; 311. first servo motor; 312. worm gear; 313. worm; 314. fixing block; 315. first cylinder; 316. groove; 317. pushing block; 318. clamping block; 319. second spring; 320. first pulley; 321. second pulley; 322. belt; 323. limiting rod; 324. connecting block; 4. Liquid discharge pipe; 5. Retaining ring; 6. Circulation pump; 7. Suction pipe; 8. Liquid outlet pipe; 9. Liquid outlet hole; 10. Feeding assembly; 1001. Column; 1002. Round shaft; 1003. Cross block; 1004. Second cylinder; 1005. Pneumatic finger; 1006. Hollow barrel; 1007. Connecting rod; 1008. Round table; 1009. Grooved wheel; 1010. Turntable; 1011. Radial groove; 1012. Rotating pin; 1013. Second servo motor. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] Embodiment 1, as Figures 1 to 5 As shown, this embodiment provides an oscillating self-cleaning circuit board etching device and method, comprising a base 1, a cleaning barrel 2 is provided on the upper side of the base 1, and an oscillating component 3 is provided between the base 1 and the cleaning barrel 2; The oscillation component 3 is provided with a movable block 301, and the four corners of the movable block 301 are slidably connected with a slide bar 302, the bottom surface of the slide bar 302 is fixedly connected to the top surface of the base 1, and the outer peripheral wall of the lower end of the slide bar 302 is sleeved with a first spring 303, the top surface of the first spring 303 is fixedly connected to the bottom surface of the movable block 301, and the bottom surface of the first spring 303 is fixedly connected to the top surface of the base 1, and the top surface of the movable block 301 is fixedly connected to two supporting blocks 304, and a protrusion 305 is provided between the two supporting blocks 304, and the protrusion 305 is fixedly connected to the bottom surface of the movable block 301. 05 is sleeved with a rotating shaft 306 in the middle part, and a first servo motor 311 is installed on the top surface of the movable block 301 through a mounting seat, and the output shaft of the first servo motor 311 is connected to the rotating shaft 306; the outer peripheral wall of the rotating shaft 306 is rotatably connected to the two supporting blocks 304 respectively; through the restoring force of the first spring 303 and the weight of the cleaning barrel 2, the movable block 301 moves downward quickly when the inner concave part of the protrusion 305 contacts the outer peripheral wall of the rotating wheel 307, thereby improving the contact effect between the protrusion 305 and the rotating wheel 307.

[0035] A positioning block 308 is fixedly provided on the bottom surface of the middle part of the movable block 301, and a rotating wheel 307 is rotatably connected to the lower end of the positioning block 308. The outer peripheral wall of the rotating wheel 307 abuts against the outer peripheral wall of the protrusion 305. A rotating column 309 is fixedly provided on the bottom surface of the cleaning barrel 2, and a limiting ring 310 is fixedly provided on the outer peripheral wall of the lower end of the rotating column 309. The limiting ring 310 is located inside the movable block 301, and the lower end of the rotating column 309 and the limiting ring 310 are rotatably connected to the middle part of the movable block 301 respectively.

[0036] A worm wheel 312 is sleeved on the outer peripheral wall of the middle part of the rotating column 309, and a worm 313 is meshedly connected to the worm wheel 312. Both ends of the worm 313 are rotatably connected to fixed blocks 314, and the bottom surface of the fixed block 314 is fixedly connected to the top surface of the movable block 301; the worm wheel 312 rotates along the fixed block 314, and the worm 313 is meshed and transmitted to the worm wheel 312 to rotate, so that the worm wheel 312 drives the rotating column 309 and the limiting ring 310 to rotate along the movable block 301, thereby driving the cleaning barrel 2 to rotate.

[0037] During the initial oscillation, the circuit board to be etched is first placed in the cleaning barrel 2 to ensure that the circuit board is completely immersed in the etching liquid. The protrusion 305 is driven to rotate by the rotating shaft 306. Since the outer peripheral wall of the protrusion 305 abuts against the rotating wheel 307, the rotating wheel 307 will swing back and forth up and down, thereby driving the movable block 301 to slide along the sliding rod 302, so that the first spring 303 is compressed or stretched by the movable block 301. Through the restoring force of the first spring 303 and the weight of the cleaning barrel 2, the movable block 301 moves downward quickly when the inner concave part of the protrusion 305 contacts the outer peripheral wall of the rotating wheel 307, thereby improving the contact effect between the protrusion 305 and the rotating wheel 307. At this time, the movable block 301 drives the rotating column 309 and the cleaning barrel 2 to move synchronously, so that the etching liquid and the circuit board in the cleaning barrel 2 fluctuate, which helps the etching liquid to be more evenly distributed on the surface of the circuit board, enhances the oscillation effect during the etching process, ensures the continuity and stability of the oscillation, and facilitates the self-cleaning use of the circuit board etching. When oscillating again, the first servo motor 311 drives the rotating shaft 306 to rotate, while driving one of the first pulleys 320 to rotate, and the belt 322 is used to transmit the friction to the other pulley to rotate, so that the worm wheel 312 rotates along the fixed block 314, and the worm 313 is meshed and transmitted to the worm wheel 312 to rotate, so that the worm wheel 312 drives the rotating column 309 and the limit ring 310 to rotate along the movable block 301, and drives the cleaning barrel 2 to rotate. At this time, the force of the protrusion 305 and the worm wheel 312 makes the cleaning barrel 2 shake up and down and rotate to produce oscillation, which fully oscillates the circuit board inside the cleaning barrel 2 and cleans the circuit board. The frequency, amplitude and rotation speed of the oscillation are adjusted to adapt to circuit boards of different materials, sizes and etching requirements.

[0038] Embodiment 2, as Figures 1 to 7As shown, this embodiment is based on the previous embodiment, and is different from the previous embodiment in that a first cylinder 315 is installed on the outer wall of the movable block 301 through a mounting seat, two grooves 316 are provided on the movable block 301, a push block 317 is slidably connected to the outer wall of the movable block 301, two clamping blocks 318 are fixed on the push block 317, the clamping blocks 318 are slidably connected to the grooves 316, a second spring 319 is fixed on the side wall of the clamping block 318, and the piston rod of the first cylinder 315 is fixedly connected to the second spring 319; the second spring 319 provides elasticity and buffering for the sliding of the push block 317, thereby reducing the risk of damage to the belt 322 due to excessive tension or relaxation.

[0039] The outer peripheral wall of the rotating shaft 306 is rotatably connected with a connecting block 324, and the connecting block 324 is fixedly arranged on the top surface of the base 1. The rotating shaft 306 and the worm 313 are respectively sleeved with a first pulley 320, and the push block 317 is rotatably connected with a second pulley 321. The wheel grooves of the two first pulleys 320 are respectively in friction contact with the second pulley 321 through the belt 322. The outer sides of the first pulley 320 and the second pulley 321 are respectively provided with a limiting rod 323, and a gap is left between the limiting rod 323 and the first pulley 320 and the second pulley 321, and the limiting rod 323 is located at one of the first pulleys 320 and the second pulley 321. The limiting rod 323 on the outside of the first pulley 320 is installed on the outer wall of one of the fixed blocks 314, the limiting rod 323 on the outside of the other first pulley 320 is installed on the outer wall of the connecting block 324, and the limiting rod 323 located on the outside of the second pulley 321 is installed on the pushing block 317; the pushing block 317 is pushed to slide along the movable block 301, so that the blocking block 318 slides along the groove 316, and the pushing block 317 drives the second pulley 321 to move axially along the piston rod, so that the belt 322 is adaptively adjusted as the movable block 301 moves up and down.

[0040] During oscillation adjustment, by adjusting the telescopic length of the piston rod of the cylinder, the push block 317 is pushed or pulled to move by the second spring 319, and the movable push block 317 slides along the movable block 301, so that the clamping block 318 slides along the groove 316, and the push block 317 drives the second pulley 321 to move along the axial direction of the piston rod, so that the belt 322 is adaptively adjusted as the movable block 301 moves up and down. The limiting rod 323 is respectively arranged on the outer side of the first pulley 320 and the second pulley 321, and a gap is left between the first pulley 320 and the second pulley 321, respectively, so as to reduce the occurrence of belt 322 falling off or transmission failure. When the cleaning barrel 2 does not need to rotate, the pushing belt 322 reduces the friction with the second pulley 321, so that the first pulley 320 on the worm 313 stops rotating, and the rotation of the cleaning barrel 2 is controlled to achieve precise control of the oscillation intensity. The second spring 319 provides elasticity and buffering for the sliding of the push block 317, reducing the risk of damage to the belt 322 due to excessive tension or relaxation.

[0041] Embodiment three, as Figure 1 , Figure 2 and Figure 8 As shown, this embodiment is based on the previous embodiment, and is different from the previous embodiment in that the lower end of the inner wall of the cleaning barrel 2 is in an inclined structure, the lower end of the cleaning barrel 2 is connected to a drain pipe 4 with a valve, the lower end of the inner wall of the cleaning barrel 2 is sleeved with a retaining ring 5, and the outer wall of the cleaning barrel 2 is installed with a circulating pump 6 through a mounting seat, the water inlet end of the circulating pump 6 is connected to a suction pipe 7, the upper end of the suction pipe 7 is connected to the inside of the cleaning barrel 2, the water outlet end of the circulating pump 6 is connected to a liquid outlet pipe 8, the liquid outlet pipe 8 is located at the lower end of the inside of the cleaning barrel 2, and the top surface of the liquid outlet pipe 8 is in a uniformly arranged structure with multiple liquid outlet holes 9; the circulating etching liquid more evenly flushes the surface of the circuit board to remove impurities and residues attached to the circuit board.

[0042] When the solvent circulates, the suction pipe 7 is sucked by the circulation pump 6 to extract the etching liquid at the upper end of the cleaning barrel 2, and then discharged upward to the lower end of the cleaning barrel 2 through the liquid outlet pipe 8 and multiple liquid outlet holes 9, so that the etching liquid in the cleaning barrel 2 circulates, reducing the waste of etching liquid. The circulating etching liquid more evenly flushes the surface of the circuit board, removes impurities and residues attached to the circuit board, and improves the cleaning effect; The lower end of the cleaning barrel 2 is connected to a drain pipe 4 with a valve, and the impurities after vibration slide along the inclined portion of the lower end of the inner wall of the cleaning barrel 2 to the drain pipe 4, so as to facilitate the discharge of the etching liquid and impurities after cleaning.

[0043] Embodiment 4, as Figure 1 , Fig. 9 , Fig.10 , Fig.11 and Fig.12 As shown, this embodiment is based on the previous embodiment, and is different from the previous embodiment in that it also includes a feeding assembly 10, on which a column 1001 is provided, and the column 1001 is fixedly arranged on the top surface of the base 1, and a round shaft 1002 is rotatably connected to the top surface of the column 1001, and a cross block 1003 is fixedly arranged on the top surface of the round shaft 1002, and a plurality of second cylinders 1004 are installed at the edge of the top surface of the cross block 1003, and the piston rods of the second cylinders 1004 penetrate the cross block 1003 and extend to the lower end, and the bottom surface of the piston rod of the cross block 1003 is installed with a pneumatic finger 100 through a mounting seat. 5. The inner wall of the finger end of the pneumatic finger 1005 is in an arc shape, and a hollow barrel 1006 is inserted into the cleaning barrel 2. The bottom surface of the hollow barrel 1006 abuts against the top surface of the retaining ring 5. A connecting rod 1007 is fixed inside the upper end of the hollow barrel 1006, and a round table 1008 is fixed in the middle of the connecting rod 1007. The finger end of the pneumatic finger 1005 is adapted to the outer peripheral wall of the round table 1008; the inner wall of the finger end of the pneumatic finger 1005 is in an arc shape, so that it is tightly clamped with the outer wall of the round table 1008, reducing shaking and ensuring the stability and accuracy of the hollow barrel 1006 during the placement process.

[0044] A groove wheel 1009 is fixedly arranged on the outer peripheral wall of the middle part of the circular shaft 1002, and a turntable 1010 is slidably connected to the inner arc of the groove wheel 1009. A plurality of radial grooves 1011 are opened on the groove wheel 1009, and a rotating pin 1012 is fixedly arranged on the turntable 1010. The outer peripheral wall of the rotating pin 1012 is slidably connected to the groove wall of the radial groove 1011. A second servo motor 1013 is installed on the upper end of the column 1001 through a mounting seat. The turntable 1010 is sleeved on the output shaft of the second servo motor 1013. There are gaps between the top surfaces of 1010 and the groove wheel 1009 and the bottom surface of the cross block 1003 respectively; the turntable 1010 and the rotating pin 1012 are driven to rotate by the output shaft of the second servo motor 1013, so that the outer peripheral wall of the turntable 1010 slides with the inner arc of the groove wheel 1009, and the rotating pin 1012 slides with one of the radial grooves 1011 of the groove wheel 1009, pushing the groove wheel 1009 to rotate 90 degrees, and rotating the hollow barrel 1006 containing the circuit board to be etched to the top of the cleaning barrel 2.

[0045] When the circuit board is conveyed, before cleaning, the circuit board to be etched is placed inside one of the hollow barrels 1006. The design of the hollow barrel 1006 allows the etching liquid to penetrate the barrel wall during the cleaning process and fully contact the circuit board. The output shaft of the second servo motor 1013 drives the turntable 1010 and the rotating pin 1012 to rotate, so that the outer peripheral wall of the turntable 1010 slides with the inner arc of the groove wheel 1009, and the rotating pin 1012 slides with one of the radial grooves 1011 of the groove wheel 1009, pushing the groove wheel 1009 to rotate 90 degrees, and rotating the hollow barrel 1006 containing the circuit board to be etched to the top of the cleaning barrel 2; The piston rod of the second cylinder 1004 moves downward, so that the corresponding pneumatic finger 1005 drives the hollow barrel 1006 to be placed inside the cleaning barrel 2. The inner wall of the finger end of the pneumatic finger 1005 is in an arc shape, so that it is tightly clamped with the outer wall of the round table 1008 to reduce shaking, ensure the stability and accuracy of the hollow barrel 1006 during the placement process, make the bottom surface of the hollow barrel 1006 abut against the top surface of the retaining ring 5, and the corresponding pneumatic finger 1005 is separated from the round table 1008; Then, the pneumatic finger 1005 is driven to move upward by the piston rod of the corresponding second cylinder 1004, and then the vibration cleaning is carried out through the vibration component 3. After the cleaning is completed, the corresponding pneumatic finger 1005 clamps the round table 1008 to separate the hollow barrel 1006 from the cleaning barrel 2, and then the groove wheel 1009 is rotated again to take out the cleaned circuit board, and at the same time, the new circuit board to be etched is placed in the cleaning barrel 2 for the next round of cleaning operation, which improves the work efficiency, ensures the stability and accuracy of the circuit board during the cleaning process, facilitates the placement and removal of the hollow barrel 1006, and further improves the efficiency of taking and placing the circuit board.

[0046] Working principle: During the initial oscillation, the circuit board to be etched is first placed in the cleaning barrel 2 to ensure that the circuit board is completely immersed in the etching liquid. The protrusion 305 is driven to rotate by the rotating shaft 306. Since the outer peripheral wall of the protrusion 305 abuts against the rotating wheel 307, the rotating wheel 307 will swing back and forth up and down, thereby driving the movable block 301 to slide along the sliding rod 302, so that the first spring 303 is compressed or stretched by the movable block 301. Through the restoring force of the first spring 303 and the weight of the cleaning barrel 2, the movable block 301 moves downward quickly when the inner concave part of the protrusion 305 contacts the outer peripheral wall of the rotating wheel 307, thereby improving the contact effect between the protrusion 305 and the rotating wheel 307. At this time, the movable block 301 drives the rotating column 309 and the cleaning barrel 2 to move synchronously, so that the etching liquid and the circuit board in the cleaning barrel 2 fluctuate, which helps the etching liquid to be more evenly distributed on the surface of the circuit board, enhances the oscillation effect during the etching process, ensures the continuity and stability of the oscillation, and facilitates the self-cleaning use of circuit board etching. When oscillating again, the first servo motor 311 drives the rotating shaft 306 to rotate, while driving one of the first pulleys 320 to rotate, and the belt 322 is used to transmit the friction to the other pulley to rotate, so that the worm wheel 312 rotates along the fixed block 314, and the worm 313 is meshed and transmitted to the worm wheel 312 to rotate, so that the worm wheel 312 drives the rotating column 309 and the limit ring 310 to rotate along the movable block 301, and drives the cleaning barrel 2 to rotate. At this time, the force of the protrusion 305 and the worm wheel 312 makes the cleaning barrel 2 shake up and down and rotate to produce oscillation, which fully oscillates the circuit board inside the cleaning barrel 2 and cleans the circuit board. The frequency, amplitude and rotation speed of the oscillation are adjusted to adapt to circuit boards of different materials, sizes and etching requirements.

[0047] During oscillation adjustment, by adjusting the telescopic length of the piston rod of the cylinder, the push block 317 is pushed or pulled to move by the second spring 319, and the movable push block 317 slides along the movable block 301, so that the clamping block 318 slides along the groove 316, and the push block 317 drives the second pulley 321 to move along the axial direction of the piston rod, so that the belt 322 is adaptively adjusted as the movable block 301 moves up and down. The limiting rod 323 is respectively arranged on the outer side of the first pulley 320 and the second pulley 321, and a gap is left between the first pulley 320 and the second pulley 321, respectively, so as to reduce the occurrence of belt 322 falling off or transmission failure. When the cleaning barrel 2 does not need to rotate, the pushing belt 322 reduces the friction with the second pulley 321, so that the first pulley 320 on the worm 313 stops rotating, and the rotation of the cleaning barrel 2 is controlled to achieve precise control of the oscillation intensity. The second spring 319 provides elasticity and buffering for the sliding of the push block 317, reducing the risk of damage to the belt 322 due to excessive tension or relaxation.

[0048] When the solvent circulates, the suction pipe 7 is sucked by the circulation pump 6 to extract the etching liquid at the upper end of the cleaning barrel 2, and then discharged upward to the lower end of the cleaning barrel 2 through the liquid outlet pipe 8 and multiple liquid outlet holes 9, so that the etching liquid in the cleaning barrel 2 circulates, reducing the waste of etching liquid. The circulating etching liquid more evenly flushes the surface of the circuit board, removes impurities and residues attached to the circuit board, and improves the cleaning effect; The lower end of the cleaning barrel 2 is connected to a drain pipe 4 with a valve, and the impurities after vibration slide along the inclined portion of the lower end of the inner wall of the cleaning barrel 2 to the drain pipe 4, so as to facilitate the discharge of the etching liquid and impurities after cleaning.

[0049] When the circuit board is conveyed, before cleaning, the circuit board to be etched is placed inside one of the hollow barrels 1006. The design of the hollow barrel 1006 allows the etching liquid to penetrate the barrel wall during the cleaning process and fully contact the circuit board. The output shaft of the second servo motor 1013 drives the turntable 1010 and the rotating pin 1012 to rotate, so that the outer peripheral wall of the turntable 1010 slides with the inner arc of the groove wheel 1009, and the rotating pin 1012 slides with one of the radial grooves 1011 of the groove wheel 1009, pushing the groove wheel 1009 to rotate 90 degrees, and rotating the hollow barrel 1006 containing the circuit board to be etched to the top of the cleaning barrel 2; The piston rod of the second cylinder 1004 moves downward, so that the corresponding pneumatic finger 1005 drives the hollow barrel 1006 to be placed inside the cleaning barrel 2. The inner wall of the finger end of the pneumatic finger 1005 is in an arc shape, so that it is tightly clamped with the outer wall of the round table 1008 to reduce shaking, ensure the stability and accuracy of the hollow barrel 1006 during the placement process, make the bottom surface of the hollow barrel 1006 abut against the top surface of the retaining ring 5, and the corresponding pneumatic finger 1005 is separated from the round table 1008; Then, the pneumatic finger 1005 is driven to move upward by the piston rod of the corresponding second cylinder 1004, and then the vibration cleaning is carried out through the vibration component 3. After the cleaning is completed, the corresponding pneumatic finger 1005 clamps the round table 1008 to separate the hollow barrel 1006 from the cleaning barrel 2, and then the groove wheel 1009 is rotated again to take out the cleaned circuit board, and at the same time, the new circuit board to be etched is placed in the cleaning barrel 2 for the next round of cleaning operation, which improves the work efficiency, ensures the stability and accuracy of the circuit board during the cleaning process, facilitates the placement and removal of the hollow barrel 1006, and further improves the efficiency of taking and placing the circuit board.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An oscillating self-cleaning circuit board etching device, comprising a base (1), characterized in that: A cleaning bucket (2) is provided on the upper side of the base (1), an oscillating assembly (3) is provided between the base (1) and the cleaning bucket (2), a movable block (301) is provided on the oscillating assembly (3), four corners of the movable block (301) are slidably connected with sliding rods (302), the bottom surface of the sliding rod (302) is fixedly connected to the top surface of the base (1), the outer peripheral wall of the lower end of the sliding rod (302) is sleeved with a first spring (303), the top surface of the movable block (301) is fixedly connected with two supporting blocks (304), a convex block (305) is provided between the two supporting blocks (304), a rotating shaft (306) is sleeved in the middle of the convex block (305), and the outer peripheral wall of the rotating shaft (306) is rotatably connected to the two supporting blocks (304) respectively; A positioning block (308) is fixedly provided on the bottom surface of the middle part of the movable block (301); a rotating wheel (307) is rotatably connected to the lower end of the positioning block (308); an outer peripheral wall of the rotating wheel (307) abuts against an outer peripheral wall of the protrusion (305); a rotating column (309) is fixedly provided on the bottom surface of the cleaning bucket (2); a limiting ring (310) is fixedly provided on the outer peripheral wall of the lower end of the rotating column (309); the limiting ring (310) is located inside the movable block (301); and the lower end of the rotating column (309) and the limiting ring (310) are rotatably connected to the middle part of the movable block (301) respectively.

2. The oscillating self-cleaning circuit board etching device according to claim 1, characterized in that: The top surface of the first spring (303) is fixedly connected to the bottom surface of the movable block (301), the bottom surface of the first spring (303) is fixedly connected to the top surface of the base (1), the top surface of the movable block (301) is mounted with a first servo motor (311) via a mounting seat, and the output shaft of the first servo motor (311) is connected to the rotating shaft (306).

3. The oscillating self-cleaning circuit board etching device according to claim 2, characterized in that: A worm wheel (312) is sleeved on the outer peripheral wall of the middle part of the rotating column (309), and a worm (313) is meshingly connected to the worm wheel (312). Both ends of the worm (313) are rotatably connected to fixed blocks (314), and the bottom surface of the fixed block (314) is fixedly connected to the top surface of the movable block (301).

4. The oscillating self-cleaning circuit board etching device according to claim 3, characterized in that: A first cylinder (315) is mounted on the outer wall of the movable block (301) via a mounting seat. Two grooves (316) are provided on the movable block (301). A push block (317) is slidably connected to the outer wall of the movable block (301). Two clamping blocks (318) are fixedly provided on the push block (317). The clamping blocks (318) are slidably connected to the grooves (316). A second spring (319) is fixedly provided on the side wall of the clamping block (318). The piston rod of the first cylinder (315) is fixedly connected to the second spring (319).

5. The oscillating self-cleaning circuit board etching device according to claim 4, characterized in that: The outer peripheral wall of the rotating shaft (306) is rotatably connected to a connecting block (324), and the connecting block (324) is fixedly arranged on the top surface of the base (1). The rotating shaft (306) and the worm (313) are respectively sleeved with a first pulley (320), and the push block (317) is rotatably connected to a second pulley (321). The wheel grooves of the two first pulleys (320) are in frictional contact with the second pulley (321) through belts (322), and the outer sides of the first pulley (320) and the second pulley (321) are respectively A limiting rod (323) is separately provided, and a gap is left between the limiting rod (323) and the first pulley (320) and the second pulley (321), respectively; the limiting rod (323) located outside one of the first pulleys (320) is mounted on the outer wall of one of the fixed blocks (314), the limiting rod (323) located outside the other first pulley (320) is mounted on the outer wall of the connecting block (324), and the limiting rod (323) located outside the second pulley (321) is mounted on the push block (317).

6. The oscillating self-cleaning circuit board etching device according to claim 5, characterized in that: The lower end of the inner wall of the cleaning barrel (2) is in an inclined structure, the lower end of the cleaning barrel (2) is connected to a discharge pipe (4) with a valve, the lower end of the inner wall of the cleaning barrel (2) is sleeved with a retaining ring (5), the outer wall of the cleaning barrel (2) is mounted with a circulation pump (6) through a mounting seat, the water inlet end of the circulation pump (6) is connected to a suction pipe (7), the upper end of the suction pipe (7) is connected to the inside of the cleaning barrel (2), the water outlet end of the circulation pump (6) is connected to a liquid outlet pipe (8), the liquid outlet pipe (8) is located at the lower end of the inside of the cleaning barrel (2), and the top surface of the liquid outlet pipe (8) is evenly arranged with a plurality of liquid outlet holes (9).

7. The oscillating self-cleaning circuit board etching device according to claim 6, characterized in that: The material feeding assembly (10) is also comprised of a column (1001) on which the material feeding assembly (10) is provided. The column (1001) is fixedly mounted on the top surface of the base (1). The top surface of the column (1001) is rotatably connected to a circular shaft (1002). The top surface of the circular shaft (1002) is fixedly mounted with a cross block (1003). A plurality of second cylinders (1004) are mounted at the edge of the top surface of the cross block (1003). The piston rods of the second cylinders (1004) extend through the cross block (1003) to the lower end. A pneumatic finger (1005) is mounted on the bottom surface of the piston rod of the cross block (1003) via a mounting seat. The inner wall of the finger end of the pneumatic finger (1005) is in an arc shape.

8. The oscillating self-cleaning circuit board etching device according to claim 7, characterized in that: A hollow barrel (1006) is inserted into the cleaning barrel (2), the bottom surface of the hollow barrel (1006) abuts against the top surface of the retaining ring (5), a connecting rod (1007) is fixedly provided inside the upper end of the hollow barrel (1006), a round table (1008) is fixedly provided in the middle of the connecting rod (1007), and the finger end of the pneumatic finger (1005) is matched with the outer peripheral wall of the round table (1008).

9. The oscillating self-cleaning circuit board etching device according to claim 8, characterized in that: A groove wheel (1009) is fixedly arranged on the outer peripheral wall in the middle of the circular shaft (1002); a rotating disk (1010) is slidably connected to the inner arc of the groove wheel (1009); a plurality of radial grooves (1011) are opened on the groove wheel (1009); a rotating pin (1012) is fixedly arranged on the rotating disk (1010); the outer peripheral wall of the rotating pin (1012) is slidably connected to the groove wall of the radial groove (1011); a second servo motor (1013) is mounted on the upper end of the column (1001) via a mounting seat; the rotating disk (1010) is sleeved on the output shaft of the second servo motor (1013); and the top surfaces of the rotating disk (1010) and the groove wheel (1009) respectively leave gaps with the bottom surface of the cross block (1003).

10. A method for an oscillating self-cleaning circuit board etching device, characterized in that: The oscillating self-cleaning circuit board etching device according to claim 9 comprises the following steps: Initial oscillation: first, place the circuit board to be etched in the cleaning barrel (2), ensure that the circuit board is completely immersed in the etching liquid, and drive the protrusion (305) to rotate through the rotating shaft (306). Since the outer peripheral wall of the protrusion (305) abuts against the rotating wheel (307), the rotating wheel (307) will swing back and forth up and down, thereby driving the movable block (301) to slide along the sliding rod (302). At this time, the movable block (301) drives the rotating column (309) and the cleaning barrel (2) to move synchronously, so that the etching liquid and the circuit board in the cleaning barrel (2) fluctuate, and the impurities on the surface of the circuit board are initially cleaned; Oscillation again: while the first servo motor (311) drives the rotating shaft (306) to rotate, it also drives one of the first pulleys (320) to rotate, and the other pulley is driven to rotate through the friction transmission of the belt (322), so that the worm wheel (312) rotates along the fixed block (314), and the worm (313) meshes and transmits the worm wheel (312) to rotate, so that the worm wheel (312) drives the rotating column (309) and the limit ring (310) to rotate along the movable block (301), driving the cleaning barrel (2) to rotate. At this time, the action force of the protrusion (305) and the worm wheel (312) causes the cleaning barrel (2) to shake up and down and rotate to generate oscillation, so that the circuit board inside the cleaning barrel (2) is fully oscillated, and the circuit board is cleaned; Oscillation adjustment: by adjusting the telescopic length of the piston rod of the air cylinder, the push block (317) is pushed to slide along the movable block (301), so that the clamping block (318) slides along the groove (316), and the push block (317) drives the second pulley (321) to move along the axial direction of the piston rod, so that the belt (322) is adaptively adjusted along with the up and down movement of the movable block (301). When the cleaning barrel (2) does not need to rotate, the belt (322) is pushed to reduce the friction with the second pulley (321), so that the first pulley (320) on the worm (313) stops rotating, and the rotation of the cleaning barrel (2) is controlled to adjust the oscillation intensity. Solvent circulation: The suction pipe (7) is sucked by a circulation pump (6) to extract the etching liquid at the upper end of the cleaning barrel (2), and then discharged upward to the lower end of the cleaning barrel (2) through a liquid outlet pipe (8) and a plurality of liquid outlet holes (9), so that the etching liquid in the cleaning barrel (2) circulates; Circuit board conveying material: before cleaning, the circuit board to be etched is placed inside one of the hollow barrels (1006), and the output shaft of the second servo motor (1013) drives the turntable (1010) and the rotating pin (1012) to rotate, so that the outer peripheral wall of the turntable (1010) slides with the inner arc of the groove wheel (1009), and the rotating pin (1012) slides with one of the radial grooves (1011) of the groove wheel (1009), pushing the groove wheel (1009) to rotate 90 degrees, and the hollow barrel (1006) containing the circuit board to be etched is rotated to the top of the cleaning barrel (2), and the piston rod of the second cylinder (1004) moves downward to make the corresponding After the pneumatic finger (1005) drives the hollow barrel (1006) to be placed inside the cleaning barrel (2), the corresponding pneumatic finger (1005) is separated from the round table (1008), and the pneumatic finger (1005) is driven to move upward by the piston rod of the corresponding second cylinder (1004), and then the pneumatic finger (1005) is vibrated and cleaned by the vibration component (3). After completion, the corresponding pneumatic finger (1005) clamps the round table (1008) to separate the hollow barrel (1006) from the cleaning barrel (2), and then the groove wheel (1009) is rotated again to take out the cleaned circuit board, and at the same time, a new circuit board to be etched is placed inside the cleaning barrel (2) for cleaning operation.

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