A metal expansion joint cleaning device

Abstract

The present application relates to the technical field of cleaning device, specifically to a metal expansion joint cleaning device. The device comprises a frame, a stretching frame, clamping units, a workpiece, a first amplitude unit, a clamping motor, a first square shaft, a cleaning slide frame and a hollow sleeve shaft. The stretching frame is slidingly connected to the frame, and the frame and the stretching frame are both fixed with the clamping units. The workpiece is clamped between the two clamping units. The frame is provided with the first amplitude unit to drive the stretching frame to periodically move up and down. The clamping motor is fixed to the frame. The output shaft of the clamping motor is fixedly installed with the first square shaft connected with the clamping unit. The cleaning slide frame is slidingly connected to the frame. The frame is provided with the second amplitude unit to drive the cleaning slide frame to periodically move up and down. The hollow sleeve shaft is rotatably connected to the cleaning slide frame. The device has the beneficial effects of realizing omnidirectional, variable force and self-adaptive cleaning of the inner wall of the expansion joint wave through the multistage linkage cooperation of the double-cam radial pulsation mechanism on the first amplitude unit, the second amplitude unit, the hollow sleeve shaft and the gas-liquid flow distribution unit.

Description

Technical Field

[0001] This invention relates to the field of cleaning device technology, specifically a metal expansion joint cleaning device. Background Technology

[0002] Metal expansion joints, as a key pipeline compensation element, are widely used in pipeline systems in the petroleum, chemical, power, and pharmaceutical industries to eliminate stress caused by thermal expansion and contraction of pipelines and ensure the safe operation of the pipeline network. However, after long-term service, the inner wall of the corrugated structure of metal expansion joints, especially in the trough areas, is prone to the accumulation of scale, dust, sludge, and various chemical media deposits. If these contaminants are not removed in time, they will not only weaken the compensation capacity of the expansion joint but may also cause stress corrosion cracking, and in severe cases, even lead to media leakage, causing safety accidents and production interruptions. In the prior art, patent document with publication number CN111420948A discloses a metal expansion joint cleaning device. This device uses high-pressure cleaning fluid or compressed air sprayed from the injection hole to impact and flush the inner wall of the corrugated structure. It can also achieve circumferential coverage by rotating the cylinder driven by a motor or manually rotating the expansion joint. However, after in-depth analysis of the cleaning needs and contaminant characteristics in actual application scenarios, the prior art still has the following technical problems: It is not capable of cleaning deep and stubborn scale buildup at the root of the corrugated pipe troughs and on complex curved surfaces. Based on this, the present invention provides a metal expansion joint cleaning device to solve the problems mentioned in the background art. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing a metal expansion joint cleaning device to solve the problem that existing devices are insufficient in cleaning deep and stubborn scale build-up at the root of bellows and on complex curved surfaces.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A metal expansion joint cleaning device, including a frame, and further comprising: The tension frame is slidably connected to the frame. Both the frame and the tension frame are fixedly equipped with clamping units. A workpiece is clamped between the two clamping units. The frame is equipped with a first amplitude-changing unit that drives the tension frame to periodically move up and down. A clamping motor is fixedly mounted on the frame, and a first square shaft connected to the clamping unit is fixedly mounted on the output shaft of the clamping motor. The cleaning carriage is slidably connected to the frame, and the frame is equipped with a second amplitude-changing unit that drives the cleaning carriage to move up and down periodically. A hollow sleeve shaft is rotatably connected to a cleaning carriage. A transmission gear ring and two symmetrically arranged first cams are fixedly mounted on the hollow sleeve shaft. A rotating frame is rotatably connected to the hollow sleeve shaft. Two symmetrically arranged active sliders are slidably connected to the rotating frame. Each of the two active sliders is equipped with a cleaning unit. A transmission shaft is rotatably connected to the rotating frame. A driven gear is fixedly mounted on the transmission shaft. The driven gear meshes with the transmission gear ring. A first synchronous belt is driven and connected to the transmission shaft. A tensioning unit is provided on the rotating frame to maintain the tension of the first synchronous belt. The cleaning unit includes a reciprocating slider slidably connected to a rotating frame. A compression spring is fixed between the reciprocating slider and the active slider. A roller is rotatably connected to the active slider. Two first cams alternately abut against the rollers, and the pushing strokes of the two first cams on the rollers are different. A connecting shaft and a brush roller are rotatably connected to the reciprocating slider. The connecting shaft is connected to a first synchronous belt drive. Both the connecting shaft and the brush roller are equipped with linkage gears. The two linkage gears mesh with each other. The brush roller is equipped with an array of bristle brush strips and has at least one set of cleaning spray holes. The drive motor is fixed on the frame and is connected to the first luffing unit, the second luffing unit, the slewing frame and the hollow sleeve shaft. The gas-liquid distribution unit is configured to deliver cleaning fluid to the cleaning nozzle and adjust the expansion amplitude of the brush strip.

[0005] Based on the above technical solution, the present invention can be further improved as follows.

[0006] Preferably, the clamping unit includes a clamping frame, on which a clamping screw and a sleeve shaft are rotatably connected. A first bevel gear is mounted on both the clamping screw and the sleeve shaft, and the two first bevel gears mesh orthogonally. A left-hand threaded section and a right-hand threaded section are symmetrically arranged on the clamping screw, and clamps are drivenly connected to both the left-hand threaded section and the right-hand threaded section. The clamps are slidably connected to the clamping frame. A first square hole is provided on the sleeve shaft, which is slidably connected to a first square shaft. The cross-sections of the first square shaft and the first square hole are both regular hexagonal. The clamping frame in one clamping unit is fixedly connected to the machine frame, and the clamping frame in the other clamping unit is fixedly connected to the tensioning frame.

[0007] Preferably, the tensioning unit includes a tensioning slider slidably connected to the rotating frame, a tensioning guide wheel rotatably connected to the tensioning slider, the tensioning guide wheel being driven by a first synchronous belt, a tensioning spring being installed on the side of the tensioning slider, and the other end of the tensioning spring being fixedly connected to the rotating frame.

[0008] Preferably, a second square shaft is rotatably connected to the frame, the output shaft of the drive motor is fixedly connected to the second square shaft, a hollow shaft is rotatably connected to the cleaning carriage, and a second square hole is provided on the hollow shaft to slide with the second square shaft. The cross-sections of the second square shaft and the second square hole are both regular hexagonal. A second synchronous belt and a third synchronous belt are respectively driven connected to the hollow shaft. The second synchronous belt is driven connected to the rotating frame, and the third synchronous belt is driven connected to the hollow sleeve shaft.

[0009] Preferably, the first amplitude-changing unit includes a drive wheel rotatably connected to the frame, and a second bevel gear is mounted on both the drive wheel and the second square shaft. The two second bevel gears mesh orthogonally. Along the circumferential direction, the drive wheel is alternately provided with three reciprocating sector tooth segments and three toothless arc surfaces. A rack is fixedly mounted on the tension frame. The three reciprocating sector tooth segments mesh with the rack in turn. Along the rotation direction of the drive wheel, the transmission stroke of the three reciprocating sector tooth segments to the rack increases progressively. Two first springs are mounted on the bottom surface of the tension frame, and the bottom ends of the two first springs are fixedly connected to the frame.

[0010] Preferably, the second amplitude unit includes a rotating wheel rotatably connected to the frame, and three second cams are arrayed on the rotating wheel along the circumferential direction. A cam follower wheel is rotatably connected to the cleaning carriage. The three second cams alternately abut against the cam follower wheel, and the driving stroke of the three second cams on the cam follower wheel increases progressively. A second spring is installed on the bottom surface of the cleaning carriage, and the bottom end of the second spring is fixedly connected to the frame.

[0011] Preferably, the gas-liquid distribution unit includes an air pump and a flange joint fixed on the frame. The rotating frame has mutually isolated airflow channels and liquid inflow channels. A valve pipe is connected to the port of the air pump, and a first rotary joint is provided at the other end of the valve pipe. The first rotary joint is rotatably connected to the airflow channel. A second rotary joint is provided at the bottom end of the flange joint, and the second rotary joint is rotatably connected to the liquid inflow channel. A liquid distribution chamber and a gas distribution chamber are provided inside the brush roller. A flow divider is fitted onto the top of the brush roller. A first corrugated metal hose is connected to the bottom of the airflow channel. The other end of the first corrugated metal hose is connected to the gas distribution chamber through the flow divider. A second corrugated metal hose is connected to the bottom end of the liquid inflow channel. The other end of the second corrugated metal hose is connected to the liquid distribution chamber through the flow divider. The inner cavity of each brush bar is connected to the gas distribution chamber, and the tail end of each cleaning nozzle is connected to the liquid distribution chamber.

[0012] Preferably, a pressure probe and a pressure relief valve are fixedly mounted on the valve tube, and the axis of the cleaning nozzle is perpendicular to the axis of the brush roller.

[0013] Preferably, the brush strip is made of rubber, and the surface of the brush strip is evenly covered with rubber bristles.

[0014] Preferably, a PLC controller is fixedly mounted on the upper part of the frame, a waste liquid storage tank is fixedly mounted on the bottom of the frame, and a drain valve is connected to the side of the waste liquid storage tank.

[0015] The beneficial effects of this invention are: 1. This invention achieves comprehensive, variable-force, and adaptive cleaning of the corrugated inner wall of the expansion joint through multi-stage linkage and coordination of the first amplitude-changing unit, the second amplitude-changing unit, the double-cam radial pulsation mechanism on the hollow sleeve shaft, and the gas-liquid distribution unit. Specifically, the first amplitude-changing unit drives the tensioning frame to generate periodic three-stage increasing up-and-down tensioning motions, causing the expansion joint to undergo shallow, medium, and deep tensioning sequentially. This loosens and exposes deep, stubborn dirt to the brushing area without damaging the bellows. Simultaneously, the second amplitude-changing unit drives the cleaning slide to generate periodic three-stage increasing axial reciprocating motions, causing the brush roller to sequentially complete single-wave trough fixed-point deep brushing, double-wave-middle transition area rinsing, and three-wave-middle loosened dirt pushing. Meanwhile, the two first cams on the hollow sleeve shaft with different pushing strokes alternately push the active... The slider drives the brush roller to generate alternating radial pulsations of low-pressure pre-wetting and high-pressure strong peeling. The combination of these three elements forms a composite cleaning trajectory of axial stretching and loosening, axial variable amplitude brushing, and radial pulsating peeling. This solves the problem that traditional constant amplitude stretching or simple high-pressure rinsing can only remove surface dust and cannot reach the root of the wave and the deep dirt in the R-angle transition area. At the same time, the gas-liquid distribution unit independently controls the jet pressure of the cleaning nozzle and the expansion amplitude of the bristle through mutually isolated gas and liquid paths. This allows the rubber bristle to dynamically deform according to the corrugation curvature and conform to the complex curved surface, further enhancing the mechanical scraping force of the bristles on the root of the wave, side wall depressions and other dead corners. This significantly improves the peeling efficiency of sintered and plated stubborn dirt and avoids continuous high pressure damage to thin-walled structures, achieving efficient and safe deep cleaning.

[0016] 2. This invention achieves high synchronization and energy efficiency in stretching, axial sweeping, radial pulsation, and brush roller rotation by simultaneously driving the first and second luffing units, the rotating frame's revolution, and the hollow sleeve shaft's rotation using a single drive motor. This eliminates the need for multi-power source coordination, significantly reducing equipment complexity and failure rate. The clamping unit employs a first square shaft sliding fit and centering clamping design, ensuring continuous power transmission during the stretching frame's movement. This guarantees the coaxiality of the expansion joint and the device's axis, preventing bellows distortion caused by eccentric forces. The tensioning unit automatically compensates for the synchronous belt elongation, ensuring high-speed rotation and reciprocating motion. Compared with existing cleaning methods that rely solely on fixed-stroke reciprocating rinsing or manual rotation, the innovative structure of this invention, which combines multi-stage variable amplitude stretching with multi-stage variable amplitude axial feeding, adjustable radial pulsating pressure, and adaptive brush roller expansion, not only solves the industry problem of effectively removing deep-seated dirt from the root of wave troughs and complex curved surfaces in principle, but also achieves real-time adjustment of cleaning force and expansion amplitude through independent gas-liquid distribution. This significantly improves the cleaning adaptability and operational efficiency of expansion joints of different specifications and levels of dirt, demonstrating outstanding substantive features and significant progress. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a metal expansion joint cleaning device according to the present invention; Figure 2 For the present invention Figure 1 A structural diagram from another angle; Figure 3 This is a schematic diagram of the structure of the second cam and the cam follower wheel of the present invention; Figure 4 This is a schematic diagram of the structure of the cam follower wheel and brush roller of the present invention; Figure 5 This is a schematic diagram of the drive wheel structure of the present invention; Figure 6 This is a schematic diagram of the hollow sleeve shaft of the present invention; Figure 7 This is a schematic diagram of the clamp structure of the present invention; Figure 8 This is a schematic diagram of the structure of the rotating frame of the present invention; Figure 9 For the present invention Figure 8 A magnified schematic diagram of the partial structure at point A in the middle; Figure 10 This is a schematic cross-sectional view of the air inlet channel and liquid inlet channel of the present invention. Figure 11 This is a schematic diagram of the structure of the flow divider of the present invention.

[0018] The attached diagram lists the components represented by each number as follows: 1. Frame; 2. Stretching frame; 3. Clamping motor; 4. Cleaning slide; 5. Hollow sleeve shaft; 6. Drive motor; 7. Workpiece; 101. Air pump; 102. Flange joint; 103. Air inlet channel; 104. Liquid inlet channel; 105. Valve pipe; 106. Liquid distribution chamber; 107. Gas distribution chamber; 108. Flow divider; 109. First corrugated metal hose; 110. Second corrugated metal hose; 111. PLC controller; 112. Waste liquid storage tank; 201. Drive wheel; 202. Reciprocating sector gear section; 203. Rack; 204. First spring; 301. First square shaft; 302. Clamping frame; 303. Clamping wire 304. Rod; 305. Sleeve shaft; 401. Clamp; 402. Second square shaft; 403. Hollow shaft; 404. Rotating wheel; 405. Second cam; 406. Cam follower wheel; 407. Second spring; 501. Transmission gear ring; 502. First cam; 503. Rotating frame; 504. Driving slider; 505. Transmission shaft; 506. Driven gear; 507. Reciprocating slider; 508. Compression spring; 509. Roller; 510. Connecting shaft; 511. Brush roller; 512. Linkage gear; 513. Brush strip; 514. Cleaning nozzle; 515. Tensioning slider; 516. Tensioning guide wheel; 517. Tensioning spring. Detailed Implementation

[0019] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0020] The present invention provides the following preferred embodiments. like Figure 1-11 As shown, a metal expansion joint cleaning device includes a frame 1, a PLC controller 111 fixedly mounted on the upper part of the frame 1, a waste liquid storage tank 112 fixedly mounted on the bottom of the frame 1, and a drain valve connected to the side of the waste liquid storage tank 112. The device also includes: The tension frame 2 is slidably connected to the frame 1. Both the frame 1 and the tension frame 2 are fixedly equipped with clamping units. The workpiece 7 is clamped between the two clamping units. The frame 1 is provided with a first amplitude-changing unit that drives the tension frame 2 to periodically move up and down. In this embodiment, the specifications of the metal expansion joint to be cleaned are as follows: nominal diameter DN300, corrugated wall thickness 1.0 mm, corrugation height 25 mm, corrugation pitch 30 mm, number of corrugations 8, and material is stainless steel 304. During operation, the tension frame 2, driven by the first amplitude unit, drives the metal expansion joint clamped between the two clamping units to reciprocate along its axial direction for stretching and retraction. The clamping motor 3 is fixedly mounted on the frame 1, and a first square shaft 301 connected to the clamping unit is fixedly mounted on the output shaft of the clamping motor 3. The clamping unit includes a clamping frame 302, on which a clamping screw 303 and a sleeve shaft 304 are rotatably connected. A first bevel gear is installed on both the clamping screw 303 and the sleeve shaft 304. The two first bevel gears mesh orthogonally. A left-hand threaded section and a right-hand threaded section are symmetrically arranged on the clamping screw 303. A clamp 305 is drivenly connected to both the left-hand threaded section and the right-hand threaded section. The clamp 305 is slidably connected to the clamping frame 302. A first square hole is opened on the sleeve shaft 304, which is slidably connected to a first square shaft 301. The cross-sections of the first square shaft 301 and the first square hole are both regular hexagonal. The clamping frame 302 in one clamping unit is fixedly connected to the frame 1, and the clamping frame 302 in the other clamping unit is fixedly connected to the tensioning frame 2. During operation, the clamping motor 3 drives the first square shaft 301 to rotate, and through the two orthogonally meshing first bevel gears, it drives the sleeve shaft 304 and the clamping screw 303 to rotate synchronously. The left-hand threaded section and the right-hand threaded section on the clamping screw 303 synchronously drive the two clamps 305 to slide towards each other, thereby realizing the automatic centering and clamping of the flanges at both ends of the metal expansion joint. When the tensioning frame 2 drives the clamping unit on it to move up and down, the sleeve shaft 304 slides along the first square shaft 301 axially, always maintaining the continuous transmission of clamping power, without the need to set up an additional independent clamping power source. The synchronous centering clamping structure ensures the coaxiality of the metal expansion joint and the device axis, avoiding the bellows twisting and deformation caused by eccentric force during the stretching process. The cleaning carriage 4 is slidably connected to the frame 1, and the frame 1 is provided with a second amplitude unit that drives the cleaning carriage 4 to move up and down periodically. A hollow sleeve shaft 5 is rotatably connected to a cleaning carriage 4. A transmission gear ring 501 and two symmetrically arranged first cams 502 are fixedly mounted on the hollow sleeve shaft 5. A rotating frame 503 is rotatably connected to the hollow sleeve shaft 5. Two symmetrically arranged active sliders 504 are slidably connected to the rotating frame 503. Each of the two active sliders 504 is equipped with a cleaning unit. A transmission shaft 505 is rotatably connected to the rotating frame 503. A driven gear 506 is fixedly mounted on the transmission shaft 505. The driven gear 506 meshes with the transmission gear ring 501. A first synchronous belt is driven and connected to the transmission shaft 505. A tensioning unit for tensioning and maintaining the first synchronous belt is provided on the rotating frame 503. The cleaning unit includes a reciprocating slider 507 slidably connected to the rotating frame 503. A compression spring 508 is fixed between the reciprocating slider 507 and the active slider 504. A roller 509 is rotatably connected to the active slider 504. Two first cams 502 alternately abut against the roller 509, and the pushing strokes of the two first cams 502 on the roller 509 are different. A connecting shaft 510 and a brush roller 511 are rotatably connected to the reciprocating slider 507. The connecting shaft 510 is connected to the first synchronous belt drive. Both the connecting shaft 510 and the brush roller 511 are equipped with linkage gears 512. The two linkage gears 512 mesh with each other. The brush roller 511 is equipped with an array of bristle brushes 513 and has at least one set of cleaning spray holes 514. The bristle brushes 513 are made of rubber and the surface of the bristle brushes 513 is evenly covered with rubber bristles. The tensioning unit includes a tensioning slider 515 slidably connected to the rotating frame 503, a tensioning guide wheel 516 rotatably connected to the tensioning slider 515, the tensioning guide wheel 516 being connected to the first synchronous belt, a tensioning spring 517 being installed on the side of the tensioning slider 515, and the other end of the tensioning spring 517 being fixedly connected to the rotating frame 503. During operation, the hollow sleeve shaft 5 drives the transmission gear ring 501 to rotate, which in turn drives the transmission shaft 505 to rotate through the meshing driven gear 506. The first synchronous belt drives the connecting shaft 510 to rotate, and then the two meshing linkage gears 512 drive the brush roller 511 to rotate at high speed. At the same time, the two first cams 502 on the hollow sleeve shaft 5 alternately abut against the rollers 509 on the active slider 504, pushing the active slider 504 to slide along the rotating frame 503, and driving the reciprocating slider 507 and brush roller 511 to perform radial reciprocating motion through the compression spring 508. Under the elastic force of the tension spring 517, the tension slider 515 always drives the tension guide wheel 516 to press the first synchronous belt, automatically compensating for the elongation of the synchronous belt. The drive motor 6 is fixedly mounted on the frame 1 and is connected to the first luffing unit, the second luffing unit, the slewing frame 503 and the hollow sleeve shaft 5. A second square shaft 401 is rotatably connected to the frame 1. The output shaft end of the drive motor 6 is fixedly connected to the second square shaft 401. A hollow shaft 402 is rotatably connected to the cleaning carriage 4. A second square hole is opened on the hollow shaft 402, which is slidably connected to the second square shaft 401. The cross-sections of the second square shaft 401 and the second square hole are both regular hexagonal. A second synchronous belt and a third synchronous belt are respectively driven and connected to the hollow shaft 402. The second synchronous belt is driven and connected to the rotating frame 503, and the third synchronous belt is driven and connected to the hollow sleeve shaft 5.

[0021] The first amplitude-changing unit includes a drive wheel 201 rotatably connected to the frame 1. A second bevel gear is installed on both the drive wheel 201 and the second square shaft 401. The two second bevel gears mesh orthogonally. Along the circumferential direction, the drive wheel 201 is alternately provided with three reciprocating sector tooth segments 202 and three toothless arc surfaces. A rack 203 is fixedly installed on the tension frame 2. The three reciprocating sector tooth segments 202 mesh with the rack 203 in turn. Along the rotation direction of the drive wheel 201, the transmission stroke of the three reciprocating sector tooth segments 202 to the rack 203 increases. Two first springs 204 are installed on the bottom surface of the tension frame 2. The bottom ends of the two first springs 204 are fixedly connected to the frame 1. In this embodiment, the three reciprocating sector tooth segments 202 arranged sequentially on the drive wheel 201 along the rotation direction drive the rack 203 to a first stroke of 15 mm, a second stroke of 30 mm, and a third stroke of 45 mm, respectively. The three reciprocating sector tooth segments 202 take turns meshing with the rack 203 and cooperating with the reset action of the first spring 204, so that the tension frame 2 drives the DN300 metal expansion joint to produce a periodic three-stage amplitude stretching and retraction motion. By progressively increasing the stretching stroke, shallow stretching slightly opens the troughs to facilitate the penetration of cleaning fluid; medium stretching fully expands the troughs so that the brush strips 513 of the brush roller 511 can fully contact the inner wall of the troughs; and deep stretching causes relative misalignment between the crests and troughs and releases accumulated dirt stress. Thus, without causing plastic deformation to the bellows, the troughs, crests, and sidewalls of each corrugation receive progressively varying brushing and spraying effects. This effectively solves the problem of difficult removal of residual dirt deep in the troughs during traditional constant-amplitude stretching cleaning, and significantly improves the cleanliness uniformity of the inner surface of the corrugations of this specification, especially at the root of the troughs.

[0022] The second amplitude unit includes a rotating wheel 403 rotatably connected to the frame 1. Along the circumferential direction, three second cams 404 are arrayed on the rotating wheel 403. A cam follower wheel 405 is rotatably connected to the cleaning carriage 4. The three second cams 404 alternately abut against the cam follower wheel 405, and the driving stroke of the three second cams 404 on the cam follower wheel 405 increases progressively. A second spring 406 is installed on the bottom surface of the cleaning carriage 4, and the bottom end of the second spring 406 is fixedly connected to the frame 1. The length of brush roller 511 is designed to be 320 mm to fully cover the total axial length formed by the 8 corrugations. The material of brush roller 511 is a wear-resistant nylon matrix, which is covered with a polyurethane elastic layer. The bristles are 0.3 mm diameter nylon filaments that are resistant to acids and alkalis. The driving strokes of the three second cams 404 arranged sequentially along the rotation direction of the rotating wheel 403 to the cam follower wheel 405 are as follows: first driving stroke 30 mm, second driving stroke 60 mm, and third driving stroke 90 mm. The three second cams 404 alternately abut against the cam follower wheel 405 and cooperate with the reset action of the second spring 406 to make the cleaning carriage 4 drive the brush roller 511 to produce a periodic three-level increasing axial feed motion. The first drive stroke moves the brush roller 511 exactly one wave pitch, performing targeted deep brushing on a single wave trough. The bristles 513 expand moderately under the control of the gas-liquid distribution unit, pressing the bristles into the root of the wave trough and rotating to peel off the accumulated dirt. The second drive stroke causes the brush roller 511 to continuously cross two wave pitches. During the movement, the cleaning nozzle 514 uses a fan-shaped jet to sequentially flush the sidewalls of the wave crests and adjacent wave troughs, achieving coverage of the transition area. The third drive stroke causes the brush roller 511 to sweep across three wave pitches at once, using the large axial displacement inertia to push the loosened dirt in the troughs toward the end of the expansion joint, and collect it by the waste liquid storage tank 112. Through progressively increasing axial strokes of 30 mm, 60 mm, and 90 mm, combined with the periodic stretching of the expansion joint body by the first amplitude-changing unit, a composite motion of axial brushing and axial stretching is formed. This effectively solves the problem of dirt residue easily remaining in the deep troughs and the R-angle area of ​​the wave transition during fixed-stroke reciprocating cleaning, and significantly improves the overall cleanliness and cleaning efficiency of the corrugated inner surface of the DN300 stainless steel expansion joint.

[0023] In this embodiment, the pushing strokes of the two first cams 502 are 5 mm and 15 mm, respectively; When the hollow sleeve shaft 5 rotates, the two first cams 502 alternately abut against the rollers 509 on the two active sliders 504, causing the two symmetrically arranged cleaning units to generate periodic reciprocating motion in a direction perpendicular to the axis of the expansion joint, thereby changing the contact pressure and adhesion between the brush roller 511 and the corrugated surface. When the first cam 502 is pushed with a small stroke of 5 mm, the radial feed of the brush roller 511 is small, the bristles only lightly touch the surface of the crests and troughs, the bristle strip 513 is slightly compressed, and the cleaning nozzle 514 pre-wets the dirt layer with a low-pressure fan-shaped jet and washes away the floating dust, so as to achieve non-destructive pre-cleaning of the corrugated surface. When the second first cam 502 pushes with a large stroke of 15 mm, the brush roller 511 is pressed deeper radially, the bristle 513 is significantly compressed and radially expanded, and the bristles are embedded into the root of the trough and the R-angle transition area with greater pressure. At the same time, the compressed spring 508 stores energy, so that the brush roller 511 and the corrugated surface always maintain elastic contact, effectively peeling off stubborn dirt that has been sintered or hardened. The two first cams 502 work alternately, causing the brush roller 511 to generate two low-pressure and two high-pressure radial pulsations every one revolution. Combined with the rotational and axial reciprocating motion of the brush roller 511 itself, it realizes an alternating cleaning mode of first wetting and loosening, and then forcefully peeling off the corrugated surface of the DN300 expansion joint. This avoids the risk of continuous high pressure damaging the thin wall of the corrugated pipe, and solves the problem that constant low pressure cannot remove deep-seated dirt. It significantly improves the cleaning uniformity and cleaning safety of the corrugated root and R-corner area.

[0024] The gas-liquid distribution unit is configured to deliver cleaning fluid to the cleaning nozzle 514 and adjust the expansion amplitude of the bristle brush 513.

[0025] The gas-liquid distribution unit includes an air pump 101 and a flange joint 102 fixed on the frame 1. The rotating frame 503 has an air inlet channel 103 and a liquid inlet channel 104 that are isolated from each other. The port of the air pump 101 is connected to a valve pipe 105. The other end of the valve pipe 105 is provided with a first rotary joint. The first rotary joint is rotatably connected to the air inlet channel 103. A pressure probe and a pressure relief valve are fixed on the valve pipe 105. The axis of the cleaning nozzle 514 is perpendicular to the axis of the brush roller 511. The bottom end of the flange joint 102 is provided with a second rotary joint, which is rotatably connected to the liquid inlet channel 104. The brush roller 511 has a liquid distribution chamber 106 and a gas distribution chamber 107 that are isolated from each other. The top of the brush roller 511 is fitted with a flow divider 108. The bottom of the air inlet channel 103 is connected to a first corrugated metal hose 109. The other end of the first corrugated metal hose 109 is connected to the gas distribution chamber 107 through the flow divider 108. The bottom end of the liquid inlet channel 104 is connected to a second corrugated metal hose 110. The other end of the second corrugated metal hose 110 is connected to the liquid distribution chamber 106 through the flow divider 108. The inner cavity of each bristle brush strip 513 is connected to the gas distribution chamber 107. The tail end of each cleaning nozzle 514 is connected to the liquid distribution chamber 106.

[0026] During operation, the external cleaning fluid enters the inlet channel 104 inside the rotating frame 503 through the flange joint 102 and the second rotary joint, enters the distribution chamber 106 of the brush roller 511 through the second corrugated metal hose 110 and the distribution cylinder 108, and finally sprays out from the cleaning nozzle 514 perpendicular to the axis of the brush roller 511 to form a jet to rinse the corrugated surface. Compressed air generated by air pump 101 enters the air intake channel 103 inside the rotating frame 503 through valve pipe 105 and first rotary joint, and enters the air distribution chamber 107 of brush roller 511 through first corrugated metal hose 109 and distributor cylinder 108, inflating the inner cavity of bag brush strip 513. The air pressure probe monitors the air circuit pressure in real time. When the pressure exceeds the set threshold, the pressure relief valve automatically opens to release pressure. The above structure enables independent and precise control of the spraying of cleaning fluid and the expansion amplitude of the brush strip 513. It can dynamically adjust the brushing pressure according to the thickness of dirt and the depth of ripples, so that the rubber bristles can fit completely into the rippled surface. The gas-liquid dual-channel design completely isolates fluids from cross-contamination. The combination of rotary joint and corrugated metal hose adapts to the revolution, rotation and radial pulsation of the cleaning unit, ensuring the continuity and sealing of fluid delivery. This solves the problems of traditional cleaning devices being unable to dynamically adjust the scrubbing force and easy leakage of fluid delivery in moving parts.

[0027] The specific steps for using this invention are as follows: First, place the metal expansion joint to be cleaned between the two clamping units of the frame 1 and the tension frame 2. Start the clamping motor 3, and its output shaft drives the first square shaft 301 to rotate. Through the first bevel gear on the sleeve shaft 304, the clamping screw 303 is driven to rotate. The symmetrical left-hand thread section and right-hand thread section on the clamping screw 303 drive the two clamps 305 to slide towards each other, so as to realize the automatic centering and clamping of the flanges at both ends of the expansion joint. At the same time, connect the external cleaning fluid pipeline to the flange joint 102 of the gas-liquid distribution unit, turn on the air pump 101, and preset the cleaning time, air pressure threshold and the operating parameters of each amplitude unit through the PLC controller 111 on the upper part of the frame 1 to complete the preparation work before the operation. During the working phase, the drive motor 6 is started, and its output shaft drives the second square shaft 401 to rotate. On the one hand, the drive wheel 201 of the first amplitude unit is driven to rotate through the orthogonally meshing second bevel gear. The reciprocating sector gear 202 with three strokes of 15 mm, 30 mm and 45 mm respectively meshes with the rack 203 on the tension frame 2 and cooperates with the first spring 204 to reset, driving the tension frame 2 and the upper clamping unit to perform periodic three-stage amplitude up and down movement, so that the expansion joint successively produces shallow, middle and deep layer stretching and retraction, realizing the penetration of cleaning fluid, complete expansion of the trough and release of scale stress respectively; On the other hand, the second shaft 401 drives the second and third synchronous belts to rotate through the hollow shaft 402 with sliding engagement, which respectively drive the rotating frame 503 to revolve and the hollow sleeve shaft 5 to rotate. The hollow sleeve shaft 5 drives the transmission shaft 505 to rotate through the meshing of the transmission gear ring 501 and the driven gear 506. The first synchronous belt and the meshing linkage gear 512 drive the brush roller 511 to rotate at high speed. At the same time, the two first cams 502 on the hollow sleeve shaft 5 with push strokes of 5 mm and 15 mm respectively alternately abut against the rollers 509 on the active slider 504. With the help of the compression spring 508, the brush roller 511 is driven to make radial reciprocating pulsations, realizing the alternating brushing mode of low-pressure pre-wetting of the corrugated surface to remove floating dust and high-pressure peeling of stubborn dirt. The tensioning spring 517 of the tensioning unit drives the tensioning guide wheel 516 to tension the first synchronous belt in real time to compensate for its elongation and ensure transmission stability. At the same time, the rotating wheel 403 of the second amplitude unit rotates synchronously with the second square shaft 401. The second cam 404, with three driving strokes of 30 mm, 60 mm, and 90 mm respectively, alternately abuts against the cam follower wheel 405 on the cleaning carriage 4 and resets in conjunction with the second spring 406, driving the cleaning carriage 4 and brush roller 511 to perform periodic three-stage amplitude axial reciprocating motion, sequentially completing single-wave trough fixed-point deep brushing, double-wave transition area rinsing, and three-wave loose dirt pushing. During this process, gas-liquid distribution is achieved. The flow unit works synchronously. External cleaning fluid enters the distribution chamber 106 of brush roller 511 through flange joint 102, second rotary joint, liquid inlet channel 104, second corrugated metal hose 110 and distribution cylinder 108. It is sprayed out from the cleaning nozzle 514 perpendicular to the axis of brush roller 511 to form a jet flush. Compressed air generated by air pump 101 enters the air distribution chamber 107 through valve pipe 105, first rotary joint, air inlet channel 103, first corrugated metal hose 109 and distribution cylinder 108, causing the rubber bristle brush strip 513 to expand to fit the corrugated surface. The air pressure probe monitors the air circuit pressure in real time. When the pressure is over-pressurized, the pressure relief valve automatically opens to relieve pressure. After the preset cleaning cycle is completed, the drive motor 6 stops running, the gas-liquid distribution unit shuts off the air pump 101 and the cleaning fluid supply in sequence, the pressure relief valve automatically discharges the residual air pressure in the pipeline, the clamping motor 3 reverses to drive the clamp 305 to loosen the expansion joint, and the cleaned workpiece 7 is taken out. Finally, the drain valve on the side of the waste liquid storage tank 112 at the bottom of the frame 1 is opened to discharge the collected cleaning waste liquid, thus completing the cleaning operation of the entire metal expansion joint.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A metal expansion joint cleaning device, comprising a frame (1), characterized in that, Also includes: The stretching frame (2) is slidably connected to the frame (1). Both the frame (1) and the stretching frame (2) are fixedly equipped with clamping units. The workpiece (7) is clamped between the two clamping units. The frame (1) is provided with a first amplitude-changing unit that drives the stretching frame (2) to move up and down periodically. The clamping motor (3) is fixedly mounted on the frame (1), and a first square shaft (301) connected to the clamping unit is fixedly mounted on the output shaft of the clamping motor (3). The cleaning carriage (4) is slidably connected to the frame (1), and the frame (1) is provided with a second amplitude unit that drives the cleaning carriage (4) to move up and down periodically. A hollow sleeve shaft (5) is rotatably connected to a cleaning carriage (4). A transmission gear ring (501) and two symmetrically arranged first cams (502) are fixedly mounted on the hollow sleeve shaft (5). A rotating frame (503) is rotatably connected to the hollow sleeve shaft (5). Two active sliders (504) are slidably connected to the rotating frame (503). Each of the two active sliders (504) is equipped with a cleaning unit. A transmission shaft (505) is rotatably connected to the rotating frame (503). A driven gear (506) is fixedly mounted on the transmission shaft (505). The driven gear (506) meshes with the transmission gear ring (501). A first synchronous belt is driven and connected to the transmission shaft (505). A tensioning unit for tensioning and maintaining the first synchronous belt is provided on the rotating frame (503). The cleaning unit includes a reciprocating slider (507) slidably connected to a rotating frame (503), a compression spring (508) fixed between the reciprocating slider (507) and the active slider (504), a roller (509) rotatably connected to the active slider (504), two first cams (502) alternately abutting against the roller (509) and the pushing stroke of the two first cams (502) against the roller (509) is different, a connecting shaft (510) and a brush roller (511) rotatably connected to the reciprocating slider (507), the connecting shaft (510) is connected to a first synchronous belt drive, a linkage gear (512) is installed on both the connecting shaft (510) and the brush roller (511), the two linkage gears (512) mesh with each other, and a bristle brush strip (513) is arranged in an array on the brush roller (511) and at least one set of cleaning spray holes (514) are opened. The drive motor (6) is fixed on the frame (1) and is connected to the first luffing unit, the second luffing unit, the slewing frame (503) and the hollow sleeve shaft (5) in a transmission connection. The gas-liquid distribution unit is configured to deliver cleaning fluid to the cleaning nozzle (514) and adjust the expansion amplitude of the bag brush strip (513).

2. The metal expansion joint cleaning device according to claim 1, characterized in that, The clamping unit includes a clamping frame (302), on which a clamping screw (303) and a sleeve shaft (304) are rotatably connected. A first bevel gear is installed on both the clamping screw (303) and the sleeve shaft (304), and the two first bevel gears mesh orthogonally. A left-hand threaded section and a right-hand threaded section are symmetrically arranged on the clamping screw (303), and a clamp (305) is drivenly connected to both the left-hand threaded section and the right-hand threaded section. The clamp (305) is slidably connected to the clamping frame (302). A first square hole is opened on the sleeve shaft (304) and slidably connected to a first square shaft (301). The cross-sections of the first square shaft (301) and the first square hole are both regular hexagonal. The clamping frame (302) in one clamping unit is fixedly connected to the frame (1), and the clamping frame (302) in the other clamping unit is fixedly connected to the tension frame (2).

3. The metal expansion joint cleaning device according to claim 1, characterized in that, The tensioning unit includes a tensioning slider (515) slidably connected to the rotating frame (503), a tensioning guide wheel (516) rotatably connected to the tensioning slider (515), the tensioning guide wheel (516) being connected to the first synchronous belt drive, a tensioning spring (517) being installed on the side of the tensioning slider (515), and the other end of the tensioning spring (517) being fixedly connected to the rotating frame (503).

4. The metal expansion joint cleaning device according to claim 1, characterized in that, A second square shaft (401) is rotatably connected to the frame (1). The output shaft end of the transmission motor (6) is fixedly connected to the second square shaft (401). A hollow shaft (402) is rotatably connected to the cleaning slide (4). A second square hole is opened on the hollow shaft (402) and slidably connected to the second square shaft (401). The cross-sections of the second square shaft (401) and the second square hole are both regular hexagonal. A second synchronous belt and a third synchronous belt are respectively driven and connected to the hollow shaft (402). The second synchronous belt is driven and connected to the rotating frame (503). The third synchronous belt is driven and connected to the hollow sleeve shaft (5).

5. A metal expansion joint cleaning device according to claim 4, characterized in that, The first amplitude unit includes a drive wheel (201) rotatably connected to the frame (1). The drive wheel (201) and the second square shaft (401) are both equipped with second bevel gears. The two second bevel gears mesh orthogonally. Along the circumferential direction, the drive wheel (201) is alternately provided with three reciprocating sector tooth segments (202) and three toothless arc surfaces. The tension frame (2) is fixedly mounted with a rack (203). The three reciprocating sector tooth segments (202) mesh with the rack (203) in turn. Along the rotation direction of the drive wheel (201), the transmission stroke of the three reciprocating sector tooth segments (202) to the rack (203) increases. The bottom surface of the tension frame (2) is equipped with two first springs (204). The bottom ends of the two first springs (204) are fixedly connected to the frame (1).

6. The metal expansion joint cleaning device according to claim 1, characterized in that, The second amplitude unit includes a rotating wheel (403) rotatably connected to the frame (1). Along the circumferential direction, three second cams (404) are arrayed on the rotating wheel (403). A cam follower wheel (405) is rotatably connected to the cleaning carriage (4). The three second cams (404) alternately abut against the cam follower wheel (405), and the driving stroke of the three second cams (404) on the cam follower wheel (405) increases progressively. A second spring (406) is installed on the bottom surface of the cleaning carriage (4), and the bottom end of the second spring (406) is fixedly connected to the frame (1).

7. A metal expansion joint cleaning device according to claim 1, characterized in that, The gas-liquid distribution unit includes an air pump (101) and a flange joint (102) fixed on the frame (1). The rotating frame (503) has an isolated air inlet channel (103) and a liquid inlet channel (104). The port of the air pump (101) is connected to a valve pipe (105). The other end of the valve pipe (105) is provided with a first rotary joint, which is rotatably connected to the air inlet channel (103). The bottom end of the flange joint (102) is provided with a second rotary joint, which is rotatably connected to the liquid inlet channel (104). The brush roller (511) has an isolated liquid distribution chamber (106) and a gas distribution chamber (107). The top of the brush roller (511) is fitted with a flow divider (108), the bottom of the air inlet channel (103) is connected to a first corrugated metal hose (109), the other end of the first corrugated metal hose (109) is connected to the air distribution chamber (107) through the flow divider (108), the bottom end of the liquid inlet channel (104) is connected to a second corrugated metal hose (110), the other end of the second corrugated metal hose (110) is connected to the liquid distribution chamber (106) through the flow divider (108), the inner cavity of each of the bag brush strips (513) is connected to the air distribution chamber (107), and the tail end of each of the cleaning nozzles (514) is connected to the liquid distribution chamber (106).

8. A metal expansion joint cleaning device according to claim 7, characterized in that, A pressure probe and a pressure relief valve are fixedly mounted on the valve tube (105), and the axis of the cleaning nozzle (514) is perpendicular to the axis of the brush roller (511).

9. A metal expansion joint cleaning device according to claim 1, characterized in that, The brush strip (513) is made of rubber, and the surface of the brush strip (513) is evenly covered with rubber bristles.

10. A metal expansion joint cleaning device according to claim 1, characterized in that, A PLC controller (111) is fixedly mounted on the upper part of the frame (1), and a waste liquid storage tank (112) is fixedly mounted on the bottom of the frame (1). A drain valve is connected to the side of the waste liquid storage tank (112).

Images