Sludge cleaning method and device in hydraulic engineering construction

Abstract

The invention belongs to the technical field of water conservancy project construction, and provides a sludge cleaning method and device in water conservancy project construction, and the method comprises the steps that a sludge cleaning assembly is installed at the front end of the whole device and used for cleaning sludge attached to the inner wall of a pipeline; the main body assembly is used for resisting running resistance and providing driving force to assist running, and is provided with a protective shell for protecting internal elements; the push rod assembly is used for providing driving power; when the movable plate moves backwards due to the resistance between the moving part and the inner wall of the pipeline, the movable plate is pushed to reset through the counter-acting force of the spring, self-adaption to the resistance of the inner wall of the pipeline can be achieved, the device state is automatically adjusted in the moving process, part of resistance is offset, and the driving stability of the device is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of water conservancy project construction, and specifically relates to a method and device for silt cleaning in water conservancy project construction. Background Art

[0002] A water conservancy project is a project built to control and allocate surface water and groundwater in nature to achieve the purpose of eliminating disasters and bringing benefits, and is also called a water project.

[0003] However, during the long-term use of water conservancy pipelines, a large amount of silt will gradually adhere to the inner wall. If not cleaned in time, it will affect the water conveyance capacity of the pipeline, increase the flow resistance, reduce the operation efficiency of water conservancy facilities, and may even cause problems such as pipeline blockage and leakage, seriously affecting the normal operation of water conservancy projects.

[0004] Therefore, some traditional dredging equipment uses simple rigid scrapers for dredging. The shape of the scraper is single, and the fit with the inner wall of the pipeline is poor, and the dredging area is limited. When facing the complex silt adhesion situation on the inner wall of the pipeline, it is difficult to completely scrape off the silt, and the dredging effect is not good, resulting in a large amount of silt remaining after dredging, which cannot meet the requirements of water conservancy projects for pipeline cleanliness, and needs to be cleaned repeatedly, consuming a large amount of manpower, material resources and time, and the dredging efficiency is low.

[0005] Moreover, existing dredging devices usually lack an effective adaptive structure. When moving in the pipeline, it is difficult to cope with the resistance changes brought about by different inner wall conditions of the pipeline. For example, when there are unevenness or local protrusions on the inner wall of the pipeline, the device is prone to greater resistance, resulting in difficult movement, and even jamming and deviation. This not only affects the continuity of the dredging operation, but may also cause damage to the device itself, increasing the maintenance cost and equipment failure rate. In addition, the existing moving structures often cannot evenly transmit power to all parts of the device, making the device prone to losing balance during movement, further affecting the dredging effect and the stability of the equipment.

[0006] Therefore, those skilled in the art have proposed a method and device for silt cleaning in water conservancy project construction, aiming to enable the device to automatically adjust its state according to the resistance of the inner wall of the pipeline, improve the efficiency and stability of the dredging operation, and enhance the adaptability of the equipment in complex environments. Summary of the Invention

[0007] In order to solve the above technical problems, the present invention provides a method and device for silt cleaning in water conservancy project construction to solve the problems raised in the background art.

[0008] According to the first aspect of the present disclosure, a silt cleaning device in water conservancy project construction is proposed, including:

[0009] The dredging component is installed at the front end of the overall device and is used to clean the silt adhering to the inner wall of the pipeline;

[0010] The main body component is used to counteract the driving resistance, provide driving force to assist in driving, and is provided with a protective shell for protecting internal components;

[0011] The push rod component is used to provide driving power.

[0012] Preferably, the dredging component includes a first motor disposed inside the main body component. A rotating shaft is provided at the output end of the first motor. A turntable is fixedly installed at the other end of the rotating shaft. The turntable is disposed at the front end outside the main body component. Scraper blades are fixedly installed at equal intervals on the outer edge of the turntable. The scraper blades are configured as folded shapes.

[0013] Preferably, the main body component further includes a rear sealing plate disposed at one end of the protective shell. A support rod is fixedly disposed inside the rear sealing plate. There are three groups of support rods. A movable plate is movably disposed on the support rods. A first installation groove is formed on the movable plate. A smooth rod is fixedly installed in the middle inside the rear sealing plate. A spring is disposed on the outer surface of the smooth rod. The spring is located between the rear sealing plate and the movable plate. Fixing plates are installed on the support rods and the smooth rod. There are two groups of fixing plates. The other group is fixedly installed on the three groups of support rods. Second installation grooves are formed on the fixing plates. A front sealing plate is fixedly installed at the front end of the support rods and in front of the fixing plates.

[0014] Preferably, a first motor is installed in the middle inside the front sealing plate. The length of the smooth rod is shorter than the length of the support rod. There are two groups of fixing plates. One group is disposed on the smooth rod and the support rods, and the other group is only disposed on the support rods. Three second installation grooves are formed on each of the fixing plates, a total of six groups. There is only one group of the first installation groove.

[0015] Preferably, the push rod component includes a first connecting rod installed in the second installation groove. The first connecting rods are movably installed on the second installation grooves. A second connecting rod is movably installed on the first installation groove. The first connecting rod and the adjacent second connecting rod are connected by a connecting shaft. A connecting rod is movably disposed between the first connecting rod provided with the connecting shaft and the opposite first connecting rod. Moving members are provided at the front ends of the first connecting rods.

[0016] Preferably, the moving member includes a base fixedly disposed at the front end of the first connecting rod. A hollow sheath is fixedly installed at the upper end of the base. A second motor is fixedly installed in the middle at the lower end of the base. A first bevel gear is fixedly installed on the output shaft of the second motor and inside the cavity of the sheath. Wheels are disposed on both sides of the sheath. The wheels are connected by a wheel shaft. The wheel shaft is disposed inside the cavity of the sheath. A second bevel gear is fixedly installed on the wheel shaft. The first bevel gear meshes with the second bevel gear.

[0017] According to the second aspect of the present disclosure, a method for dredging silt in water conservancy project construction is proposed. Using the silt dredging device proposed in the first aspect, it includes the following steps:

[0018] S1. During the construction of the water conservancy project, the entire silt dredging device is placed into the inner cavity of the pipeline.

[0019] S2. Remotely control the PLC to start the first motor, so that the first motor drives the turntable to rotate through the rotating shaft, causing the scraping blades to rotate at high speed accordingly.

[0020] S3. The high-speed rotating folded scraping blades scrape off the silt adhering to the inner wall of the pipeline cavity.

[0021] S4. Remotely control the PLC to start the second motor, and the second motor drives the first bevel gear to rotate, causing the first bevel gear to drive the engaged second bevel gear to rotate, and the wheel shaft drives the runner to rotate.

[0022] S5. The runner fits on the inner wall of the pipeline. After starting the second motor, the entire silt dredging device moves forward. During the movement, due to the resistance of the moving part and the inner wall of the pipeline, the first connecting rod is in an inclined state.

[0023] S6. The inclined first connecting rod causes the second connecting rod arranged on its connecting shaft to be inclined, causing the second connecting rod to drive the movable plate to move towards the rear sealing plate. However, under the action of the spring force, it reversely pushes the movable plate towards the fixed plate, offsetting part of the movement resistance.

[0024] S7. During the reverse pushing process, the severely inclined first connecting rod gradually returns to a state close to the vertical state. And during the inclined and reset states, there is always a distance of a connecting rod between the first connecting rods of the two groups of fixed plates.

[0025] S8. During the process of controlling the runner to move by the second motor, the silt dredging device travels from one end of the pipeline to the other end, and the silt adhering to the inner wall of the entire pipeline is scraped off by the front scraping blades for cleaning.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Through the spring - movable plate structure in the main body assembly and the connecting rod connection method of the push rod assembly in the present invention, the movable plate moves backward due to the resistance between the moving part and the inner wall of the pipeline, and the reaction force of the spring pushes the movable plate to reset, which can adapt to the resistance of the inner wall of the pipeline, automatically adjust the device state during the movement, offset part of the resistance, and improve the driving stability of the device.

[0028] 2. Through the folded scraping blades in the present invention, the silt cleaning area and scraping effect are increased, and the silt cleaning efficiency is improved.

[0029] 3. In the present invention, the first connecting rod, the connecting shaft, the second connecting rod, and the connecting rod are interconnected to form a movable structure, which transmits and disperses the power of the moving member, enabling the device to maintain balance during movement. The second motor in the moving member drives the first bevel gear, and through meshing with the second bevel gear, the wheel shaft drives the runner to rotate, providing forward driving power for the device, enabling the device to move in the pipeline to complete the dredging operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 is a schematic diagram of the inner cavity structure of the protective shell of the present invention;

[0032] Figure 3 is a schematic diagram of the dredging component structure of the present invention;

[0033] Figure 4 is a schematic diagram of the main body component structure of the present invention;

[0034] Figure 5 is a schematic diagram of the push rod component structure of the present invention;

[0035] Figure 6 is a schematic diagram of the moving member structure of the present invention;

[0036] Figure 7 is a flowchart of the sludge cleaning method in the second embodiment of the present invention.

[0037] In the figure:

[0038] 100, dredging component; 101, first motor; 102, rotating shaft; 103, turntable; 104, scraping blade; 200, main body component; 201, protective shell; 202, rear sealing plate; 203, support rod; 204, movable plate; 205, first installation groove; 206, optical bar; 207, spring; 208, fixing plate; 209, second installation groove; 210, front sealing plate; 300, push rod component; 301, first connecting rod; 302, connecting shaft; 303, second connecting rod; 304, connecting rod; 305, moving member; 305a, base; 305b, sheath; 305c, second motor; 305d, first bevel gear; 305e, runner; 305f, wheel shaft; 305g, second bevel gear. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The following further describes in detail the embodiments of the present invention in conjunction with the drawings. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0040] As shown in Figure 1 to Figure 6 shown:

[0041] Embodiment 1: The present invention provides a silt cleaning device in water conservancy project construction, including: a silt cleaning component 100, installed at the front end of the overall device, for cleaning the silt attached to the inner wall of the pipeline; a main body component 200, for counteracting the driving resistance, providing driving force to assist in driving, and provided with a protective shell 201 for protecting internal components; a push rod component 300, for providing driving power.

[0042] The silt cleaning component 100 includes a first motor 101 arranged inside the main body component 200. The output end of the first motor 101 is provided with a rotating shaft 102. The other end of the rotating shaft 102 is fixedly installed with a turntable 103. The turntable 103 is arranged at the front end outside the main body component 200. The outer edge of the turntable 103 is equidistantly fixedly installed with scraping blades 104, and the scraping blades 104 are arranged in a folded shape. The first motor 101 drives the rotating shaft 102, and then makes the turntable 103 and the folded scraping blades 104 rotate at high speed. The design of the folded scraping blades 104 increases the contact area with the silt and the scraping effect, and can effectively scrape the silt attached to the inner wall of the pipeline to achieve the silt cleaning function.

[0043] The main body component 200 further includes a rear sealing plate 202 arranged at one end of the protective shell 201. The inner side of the rear sealing plate 202 is fixedly provided with support rods 203. There are three groups of support rods 203. A movable plate 204 is movably arranged on the support rods 203. A first installation groove 205 is opened on the movable plate 204. The middle part of the inner side of the rear sealing plate 202 is fixedly installed with a smooth rod 206. A spring 207 is arranged on the outer surface of the smooth rod 206. The spring 207 is located between the rear sealing plate 202 and the movable plate 204. Fixing plates 208 are installed on the support rods 203 and the smooth rod 206. There are two groups of fixing plates 208. The other group is fixedly installed on the three groups of support rods 203. Second installation grooves 209 are opened on the fixing plates 208. A front sealing plate 210 is fixedly installed at the front end of the support rods 203 and in front of the fixing plates 208.

[0044] The middle part of the inner side of the front sealing plate 210 is installed with a first motor 101. The length of the smooth rod 206 is shorter than the length of the support rod 203. There are two groups of fixing plates 208. One group is arranged on the smooth rod 206 and the support rod 203, and the other group is only arranged on the support rod 203. There are three second installation grooves 209 on each of the fixing plates 208, a total of six groups, and there is only one group of first installation grooves 205.

[0045] Protect the internal components through the protective shell 201 to prevent the internal components from being damaged by the external environment during the dredging process. The rear sealing plate 202, the support rod 203, the movable plate 204, the optical bar 206 and the spring 207 work together. When the device moves, the movable plate 204 moves backward due to the resistance between the moving part 305 and the inner wall of the pipeline, and the reaction force of the spring 207 pushes the movable plate 204 to reset, offsetting part of the moving resistance and ensuring the smooth driving of the device. At the same time, the two groups of fixed plates 208 and different installation slots are used to install other components, making the structure of the device more stable.

[0046] The push rod assembly 300 includes a first connecting rod 301 installed on the second installation slot 209. The first connecting rod 301 is movably installed on the second installation slot 209. The second connecting rod 303 is movably installed on the first installation slot 205. The first connecting rod 301 and the adjacent second connecting rod 303 are connected by a connecting shaft 302. A connecting rod 304 is movably arranged between the first connecting rod 301 with the connecting shaft 302 and the opposite first connecting rod 301. The front ends of the first connecting rods 301 are all provided with moving parts 305.

[0047] The moving part 305 includes a base 305a fixedly arranged at the front end of the first connecting rod 301. A hollow sheath 305b is fixedly installed at the upper end of the base 305a. A second motor 305c is fixedly installed in the middle of the lower end of the base 305a. A first bevel gear 305d is fixedly installed on the output shaft of the second motor 305c and located in the inner cavity of the sheath 305b. Rotating wheels 305e are arranged on both sides of the sheath 305b. The rotating wheels 305e are connected by a wheel shaft 305f. The wheel shaft 305f is arranged in the inner cavity of the sheath 305b. A second bevel gear 305g is fixedly installed on the wheel shaft 305f. The first bevel gear 305d meshes with the second bevel gear 305g.

[0048] The first connecting rod 301, the connecting shaft 302, the second connecting rod 303 and the connecting rod 304 are connected to form a movable structure, transmitting and dispersing the power of the moving part 305, so that the device maintains balance during the moving process. The second motor 305c in the moving part 305 drives the first bevel gear 305d. By meshing with the second bevel gear 305g, the wheel shaft 305f drives the rotating wheels 305e to rotate, providing forward driving power for the device, so that the device can move in the pipeline to complete the dredging operation.

[0049] As can be seen from the above, the high-speed rotating scraping blades 104 of the dredging component 100 can quickly and effectively clean the silt on the inner wall of the pipeline, improve the dredging efficiency, and ensure the smoothness of the water conservancy pipeline. Through the cooperation of the main body component 200 and the push rod component 300, the device can effectively resist resistance during driving. Through the cooperation of the spring 207 and the connecting rod structure, it is ensured that the device moves smoothly, reducing jamming or deviation caused by resistance, and ensuring the smooth progress of the dredging operation.

[0050] As attachedFigure 7 As shown in:

[0051] Embodiment 2: The present invention also provides a method for cleaning silt in water conservancy project construction. Using the silt cleaning device in Embodiment 1, it includes the following steps:

[0052] S1. During the construction of the water conservancy project, the whole silt cleaning device is placed into the inner cavity of the pipeline;

[0053] S2. Remotely control the PLC to start the first motor 101, so that the first motor 101 drives the turntable 103 to rotate through the rotating shaft 102, causing the scraping blades 104 to rotate at high speed accordingly;

[0054] S3. The high-speed rotating folded scraping blades 104 scrape off the silt adhering to the inner wall of the pipeline cavity;

[0055] S4. Remotely control the PLC to start the second motor 305c. The second motor 305c drives the first bevel gear 305d to rotate, causing the first bevel gear 305d to drive the engaged second bevel gear 305g to rotate, and making the wheel shaft 305f drive the runner 305e to rotate;

[0056] S5. The runner 305e fits on the inner wall of the pipeline. After starting the second motor 305c, the whole silt cleaning device moves forward. During the movement, due to the resistance of the moving part 305 and the inner wall of the pipeline, the first connecting rod 301 is in an inclined state;

[0057] S6. The inclined first connecting rod 301 makes the second connecting rod 303 arranged on its connecting shaft 302 inclined, causing the second connecting rod 303 to drive the movable plate 204 to move towards the rear sealing plate 202. However, under the action of the spring 207, it reversely pushes the movable plate 204 towards the fixed plate 208, offsetting part of the movement resistance;

[0058] S7. During the reverse pushing process, the severely inclined first connecting rod 301 gradually returns to a state close to the vertical state. And during the inclined and reset states, there is always a distance of a connecting rod 304 between the first connecting rods 301 of the two groups of fixed plates 208;

[0059] S8. During the process of controlling the runner 305e to move by the second motor 305c, the silt cleaning device travels from one end of the pipeline to the other end, and scrapes off the silt adhering to the inner wall of the whole pipeline through the front scraping blades 104 for cleaning.

[0060] As can be seen from the above, by adopting the folded scraping blade 104, compared with traditional dredging tools, the dredging area and scraping effect are increased, and the dredging efficiency is improved. The spring 207 - movable plate 204 structure in the main body component 200 and the connecting rod connection mode of the push rod component 300 can adapt to the resistance of the inner wall of the pipeline, automatically adjust the device state during movement, offset part of the resistance, and improve the driving stability of the device. And by remotely controlling the first motor 101 and the second motor 305c through the PLC, the remote operation of the dredging device is realized, avoiding personnel directly entering the dangerous or harsh pipeline environment, improving the safety and convenience of operation, and providing a more efficient and safe way for the dredging operation in water conservancy project construction.

[0061] It should be noted importantly that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible without substantially departing from the novel teachings and advantages of the subject matter described in this application. Other substitutions, modifications, changes, and omissions can be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0062] In addition, in order to provide a concise description of the exemplary embodiments, all features of the actual embodiments may not be described (i.e., those features that are not relevant to the currently considered best mode of implementing the present invention or those features that are not relevant to implementing the present invention).

[0063] It should be understood that in the development of any actual implementation, in any engineering or design project, a large number of specific implementation decisions can be made. Such development efforts may be complex and time-consuming, but for those ordinary technical personnel who benefit from this disclosure, without excessive experimentation, such development efforts will be a routine work of design, manufacturing, and production.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A sludge cleaning device in water conservancy project construction, characterized in that: include: A silt removal assembly (100) is installed at the front end of the overall device and is used to remove silt attached to the inner wall of the pipeline; The main body component (200) is used to resist the driving resistance and provide the driving force to assist the driving, and is provided with a protective shell (201) to protect the internal components; The push rod assembly (300) is used to provide driving power.

2. A sludge cleaning device in water conservancy project construction as claimed in claim 1, characterized in that: The dredging component (100) comprises a first motor (101) arranged inside the main body component (200); a rotating shaft (102) is arranged at the output end of the first motor (101); a rotating disk (103) is fixedly mounted at the other end of the rotating shaft (102); the rotating disk (103) is arranged at the front end of the outer side of the main body component (200); scraping blades (104) are fixedly mounted at equal distances on the outer edge of the rotating disk (103); and the scraping blades (104) are arranged in a folded shape.

3. A sludge cleaning device in water conservancy project construction as claimed in claim 1, characterized in that: The main body component (200) further comprises a rear sealing plate (202) arranged at one end of the protective shell (201), a support rod (203) is fixedly arranged on the inner side of the rear sealing plate (202), and the support rod (203) is provided with three groups, a movable plate (204) is movably arranged on the support rod (203), and a first mounting groove (205) is provided on the movable plate (204), and a light bar (206) is fixedly installed in the middle part of the inner side of the rear sealing plate (202), and the outer surface of the light bar (206) is provided with A spring (207), wherein the spring (207) is located between the rear sealing plate (202) and the movable plate (204); a fixing plate (208) is installed on the support rod (203) and the light bar (206); two groups of the fixing plates (208) are provided, and the other group is fixedly installed on three groups of support rods (203); a second installation groove (209) is provided on each of the fixing plates (208); a front sealing plate (210) is fixedly installed at the front end of the support rod (203) and located at the front end of the fixing plate (208).

4. A sludge cleaning device in water conservancy project construction as claimed in claim 3, characterized in that: A first motor (101) is installed in the middle of the inner side of the front sealing plate (210); the length of the optical rod (206) is shorter than the length of the support rod (203); the fixing plate (208) is provided with two groups, one group is provided on the optical rod (206) and the support rod (203), and the other group is only provided on the support rod (203); three groups of second mounting grooves (209) are provided on each of the fixing plates (208), a total of six groups; and the first mounting groove (205) is provided with only one group.

5. A sludge cleaning device in water conservancy project construction as claimed in claim 4, characterized in that: The push rod assembly (300) includes a first connecting rod (301) installed on the second mounting groove (209), the first connecting rod (301) is movably installed on the second mounting groove (209), the second connecting rod (303) is movably installed on the first mounting groove (205), the first connecting rod (301) and the adjacent second connecting rod (303) are connected through a connecting shaft (302), a connecting rod (304) is movably arranged between the first connecting rod (301) provided with the connecting shaft (302) and the opposite first connecting rod (301), and a moving part (305) is arranged at the front end of the first connecting rod (301).

6. A sludge cleaning device in water conservancy project construction as claimed in claim 5, characterized in that: The moving member (305) comprises a base (305a) fixedly arranged at the front end of the first connecting rod (301); a hollow sheath (305b) is fixedly installed on the upper end of the base (305a); a second motor (305c) is fixedly installed in the middle of the lower end of the base (305a); a first bevel gear (305d) is fixedly installed on the output shaft of the second motor (305c) and located in the inner cavity of the sheath (305b); rotating wheels (305e) are arranged on both sides of the sheath (305b); the rotating wheels (305e) are connected by a wheel shaft (305f); the wheel shaft (305f) is arranged in the inner cavity of the sheath (305b); a second bevel gear (305g) is fixedly installed on the wheel shaft (305f); and the first bevel gear (305d) is meshed with the second bevel gear (305g).

7. A method for cleaning sludge in water conservancy project construction, using the sludge cleaning device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. During the construction of a water conservancy project, the sludge cleaning device is placed in its entirety into the inner cavity of the pipeline; S2, remote PLC control starts the first motor (101), so that the first motor (101) drives the rotating disk (103) to rotate through the rotating shaft (102), so that the scraper (104) rotates at a high speed; S3, the folded scraper blade (104) rotates at high speed to scrape away the sludge attached to the inner wall of the inner cavity of the pipeline; S4, remote PLC control starts the second motor (305c), the second motor (305c) drives the first bevel gear (305d) to rotate, so that the first bevel gear (305d) drives the meshing second bevel gear (305g) to rotate, and the wheel shaft (305f) drives the rotating wheel (305e) to rotate; S5, the rotating wheel (305e) is attached to the inner wall of the pipeline, and after the second motor (305c) is started, the sludge cleaning device moves forward as a whole, and during the movement, the first connecting rod (301) is in a tilted state due to the resistance between the moving part (305) and the inner wall of the pipeline; S6, the first connecting rod (301) in the inclined state causes the second connecting rod (303) provided on the connecting shaft (302) to be inclined, so that the second connecting rod (303) drives the movable plate (204) to move toward the rear sealing plate (202), but under the action of the spring (207), the movable plate (204) is pushed back to move toward the fixed plate (208), thereby offsetting part of the movement resistance; S7, during the reverse thrust process, the severely tilted first connecting rod (301) is gradually reset to a nearly vertical state, and during the tilting and reset process, the first connecting rods (301) of the two sets of fixed plates (208) are always kept at a distance of one connecting rod (304); S8. When the second motor (305c) controls the wheel (305e) to move, the sludge cleaning device moves from one end of the pipeline to the other end of the pipeline, and uses the front scraper (104) to scrape off the sludge attached to the inner wall of the entire pipeline for cleaning.

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