Device and method for bending pipeline to designated position

Abstract

The invention belongs to the technical field of petroleum and petrochemical engineering, and particularly relates to a device and method for bending a pipeline to a designated position, the device for bending the pipeline to the designated position comprises a main pipeline used for stretching into a storage tank to extract residues, and the main pipeline is a bendable flexible hose; at least two rope guide hoses are symmetrically arranged on the periphery of the main pipeline, the rope guide hoses are fixed on the outer side of the main pipeline, ropes penetrate through the rope guide hoses, the front ends of the ropes are fixedly connected with the front end of the main pipeline, and the rear ends of the ropes are connected with wire tighteners; according to the device for bending the pipeline to the designated position, the tail end of the main pipeline connected with the pump can be flexibly and accurately moved to the position of silt and desilting impurities at the bottom in the storage tank, so that the problem of cleaning the silt and desilting impurities in the storage tank is solved, workers do not need to enter the storage tank to clean the silt and desilting impurities, the cleaning efficiency is improved, and the labor intensity is reduced. Risks such as poisoning, fire disasters, explosion and falling damage are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum and petrochemicals, and in particular relates to a device and a method for bending a pipeline to a specified position. Background Art

[0002] In the field of petroleum and petrochemicals, due to the presence of some impurities in crude oil, such as sand, dirt, and algae, after long-term use of the storage tank, the impurities will accumulate and adhere to the bottom and inner wall of the storage tank, causing the inner wall of the storage tank to rust and iron slag to appear. The storage tank needs to be cleaned regularly to remove impurities, otherwise it will cause corrosion of the oil tank, pipeline blockage and even leakage. Cleaning the storage tank can also keep the inside of the storage tank clean and reduce subsequent oil pollution.

[0003] At present, when cleaning the storage tanks in petroleum and petrochemicals, the silt and sediment impurities at the bottom of the storage tank are cleaned by manually entering the tank body. Due to the large volume of the storage tank, even after the oil in the storage tank is drained, there will still be residual oil inside. The volatilization of the residual oil will cause an oil and gas environment to form in the storage tank. Therefore, the oil and gas concentration must be checked before entering the storage tank. Only when the oil and gas concentration reaches the safety standard can the silt and sediment impurities be cleaned. In the process of cleaning the silt and sediment impurities, since there is still a certain amount of oil and gas volatilization in the cleaning tank, the internal oil and gas concentration needs to be monitored in real time. Therefore, the current process of cleaning the silt and sediment impurities by manually entering the storage tank is inefficient. The most important thing is that there are still safety hazards. For example, there is a risk of gas poisoning when personnel enter the tank body, and lighting is required inside the tank. Sometimes, electric-driven cleaning tools are required, which poses a risk of fire, explosion and electric shock. In addition, due to the large volume of the storage tank and the residual oil on the internal wall, there is also a risk of slipping and falling. Summary of the invention

[0004] The present invention aims to provide a device and method for bending a pipe to a specified position, so that the device for bending a pipe to a specified position can realize accurate and flexible movement of the pipe used to extract residues in a storage tank, so that during the process of cleaning the storage tank, the residues in the storage tank can be extracted by a pump, eliminating the work of manually entering a confined space for cleaning and avoiding the risks brought by manual cleaning.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions: A device for bending a pipeline to a specified position is provided, comprising a main pipeline for extending into a storage tank to extract residues, wherein the main pipeline is a bendable flexible hose, and at least two rope guide hoses are symmetrically arranged on the periphery of the main pipeline, and the rope guide hoses are fixed on the outside of the main pipeline so that the main pipeline and the rope guide hoses can be bent synchronously; a rope is passed through the rope guide hose, the front end of the rope is fixedly connected to the front end of the main pipeline, and the rear end of the rope is connected to a tensioner.

[0006] Preferably, there are two rope guide hoses, namely a first rope guide hose and a second rope guide hose, which are respectively arranged on the left and right sides of the main pipeline, a first rope is passed through the first rope guide hose, and a second rope is passed through the second rope guide hose.

[0007] Preferably, the rope-guided hose is tied to the outside of the main pipeline by straps arranged at intervals.

[0008] Preferably, a matching connecting sleeve is provided at the front end of the main pipe, and a staggered opening slit is provided on the connecting sleeve. A docking screw hole is provided on the connecting sleeve at the opening slit, for screwing in a docking screw to align and fix the opening slit, so that the connecting sleeve is clamped on the front end of the main pipe; a rope connecting hole is also provided on the connecting sleeve, and the front end of the rope is tied in the rope connecting hole.

[0009] Preferably, the wire tensioner is a ratchet wire tensioner, which includes a clamping plate bracket and a pawl rocker, a ratchet shaft is provided between the clamping plate brackets, a ratchet wire reel is provided on the ratchet shaft, a ratchet is provided on the ratchet wire reel, the front end of the pawl rocker is hinged to the clamping plate bracket, a pawl shaft is provided on the pawl rocker, a pawl sleeve is sleeved on the pawl shaft, and a pawl matching the ratchet is provided on the pawl sleeve.

[0010] The present invention also provides a method for bending a pipeline to a specified position, the method using any of the above-mentioned devices for bending a pipeline to a specified position, the method comprising: Operating the wire tensioner to make the ropes passing through each rope guide hose in a relaxed state; Feed the main pipeline, the flexible hose and the rope inside it into the cleaning hole of the storage tank, and connect a pump to the rear end of the main pipeline; Observe the position of the residue at the bottom of the storage tank, and determine the direction in which the front end of the main pipeline needs to move according to the position of the residue. The direction in which the residue is located is the direction in which the front end of the main pipeline needs to move; According to the direction in which the front end of the main pipeline needs to move, the rope that needs to be controlled is determined, the rope on the side of the direction in which the front end of the main pipeline needs to move is the rope that needs to be controlled, and the tensioner connected to the rear end of the rope that needs to be controlled is the current control tensioner; Except for the rope that needs to be controlled, the ropes connected to the other tensioners are adjusted to a slack state; The current control tensioner is operated to tighten the rope to be controlled, thereby pulling the front end of the main pipeline toward the direction where the residue is located, and then the current control tensioner is operated again to adjust the rope to be controlled to a loose state and then tighten it. In this way, the control is repeated until the front end of the main pipeline is pulled to the location where the residue is located; The pump is started to extract the residue at the bottom of the storage tank through the main pipeline.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the device for bending a pipeline to a specified position comprises a main pipeline for extending into a storage tank to extract residues, the main pipeline is a bendable flexible hose, at least two rope guide hoses are symmetrically arranged on the periphery of the main pipeline, the rope guide hose is fixed on the outside of the main pipeline, so that the main pipeline and the rope guide hose can be bent synchronously; a rope is passed through the rope guide hose, the front end of the rope is fixedly connected to the front end of the main pipeline, and the rear end of the rope is connected to a tensioner, the device for bending a pipeline to a specified position can flexibly and accurately move the end of the main pipeline connected to the pump to the position where the silt sediment impurities at the bottom of the storage tank are located, thereby solving the problem of cleaning the silt sediment impurities in the storage tank, without the need to manually enter the storage tank to clean the silt sediment impurities, solving the problem of inefficient cleaning caused by the complicated operation procedures of manual cleaning, and there is no risk of gas poisoning caused by personnel entering the tank body, in addition, by operating on the outside of the storage tank, there is no need to enter the storage tank for lighting and use electric-driven cleaning tools, thereby avoiding the risks of fire, explosion and electric shock, as well as the risk of slipping and falling. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 The figure is a schematic structural diagram of an embodiment of a device for bending a pipe to a specified position according to the present invention.

[0013] Figure 2 The figure is a schematic structural diagram of a connecting ferrule in an embodiment of a device for bending a pipe to a specified position according to the present invention.

[0014] Figure 3The figure is a top view of a first tensioner in an embodiment of a device for bending a pipe to a specified position according to the present invention.

[0015] Figure 4 for Figure 3 AA view in .

[0016] Figure 5 The present invention is a schematic diagram of an apparatus for bending a pipe to a specified position according to an embodiment of the present invention.

[0017] In the figure, the reference numerals are indicated as: main pipeline 1, first rope guide hose 3, second rope guide hose 4, first rope 5, second rope 6, first tensioner 7, clamping plate 71, pawl rocker 72, U-shaped support plate 73, ratchet take-up reel 74, ratchet 75, pawl sleeve 76, pawl 77, tensioning plate 78, second tensioner 8, binding strap 9, connecting hoop 10, docking screw hole 101, rope connecting hole 102, storage tank 11. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In one embodiment, a device for bending a pipe to a specified position is provided, such as Figure 1-4 As shown, the device for bending a pipeline to a specified position comprises a main pipeline 1 for extending into a storage tank to extract residues, the main pipeline 1 is a bendable flexible hose, and at least two rope guide hoses are symmetrically arranged on the periphery of the main pipeline 1. In the present embodiment, two rope guide hoses are arranged, namely a first rope guide hose 3 and a second rope guide hose 4, the first rope guide hose 3 and the second rope guide hose 4 are respectively arranged on the left and right sides of the main pipeline 1, a first rope 5 is passed through the first rope guide hose 3, and a second rope 6 is passed through the second rope guide hose 4, the front ends of the first rope 5 and the second rope 6 are respectively fixedly connected to the left and right sides of the front end of the main pipeline 1, a first tensioner 7 is connected to the rear end of the first rope 5, and a second tensioner 8 is connected to the rear end of the second rope 6, and the first rope 5 can be tightened or loosened by operating the first tensioner 7. When the first rope 5 is tightened, it is in a taut state, and its front end tightens the front end of the main pipeline 1, and when the first rope 5 is loosened, its front end does not pull the front end of the main pipeline 1. Likewise, the second rope 6 can be tightened or loosened by operating the second tensioner 8 .

[0020] Combination Figure 1As shown, the first rope guide hose 3 and the second rope guide hose 4 are both fixed on the outside of the main pipe 1, so that the main pipe 1 and the rope guide hose can bend synchronously. For example, when the main pipe 1 bends to the left, the first rope guide hose 3 and the second rope guide hose 4 can be pulled to bend to the left. When the main pipe 1 bends to the right, the first rope guide hose 3 and the second rope guide hose 4 can be pulled to bend to the right, so that the first rope guide hose 3 and the second rope guide hose 4 will not hinder the main pipe 1 from turning.

[0021] The device for bending the pipeline to a specified position operates the first rope 5 passed through the first rope guide hose 3, or operates the second rope 6 passed through the second rope guide hose 4, to pull the main pipeline 1 to turn, so that its front end moves to the target position in the storage tank. If the target position is on the left, the front end of the main pipeline 1 can be rotated to the target position on the left by pulling the first rope 5. The reason is as follows: when the first rope 5 passed through the first rope guide hose 3 is tightened by operating the first tensioner 7, the first rope 5 is tightened, so that the front end of the main pipeline 1 is pulled to the left, and the main part of the main pipeline 1 is bent to the left accordingly. When the first rope 5 is tightened to a certain extent, the pulling force on the front end of the main pipeline 1 will be weakened. At this time, the first rope 5 can be loosened by operating the first tensioner 7, and then the first rope 5 can be tightened again by operating the first tensioner 7. In this way, the first rope 5 is continuously tightened and loosened until the front end of the main pipeline 1 moves to the target position on the left side of the storage tank. Likewise, if the destination position in the storage tank is on the right side, by pulling the second rope 6, the front end of the main pipeline 1 can be moved to the destination position on the right side.

[0022] Further, in another embodiment, Figure 1 As shown, the first rope guide hose 3 and the second rope guide hose 4 in the device for bending a pipeline to a specified position are tied to the outside of the main pipeline 1 by means of spaced-apart tie bands 9, and the tie bands 9 can be adhesive tape, rope belt or metal tie band. In other embodiments, the main pipeline 1 and the first rope guide hose 3 and the second rope guide hose 4 on both sides thereof can also be processed into an integrally formed pipeline.

[0023] The length of the first rope guide hose 3 and the second rope guide hose 4 is set according to the size of the internal space of the tank. The length of the first rope guide hose 3 and the second rope guide hose 4 needs to be able to reach any target position on the bottom surface of the tank from the cleaning port of the tank. The length of the main pipeline 1 is longer than the first rope guide hose 3 and the second rope guide hose 4 so as to connect the pump at the rear end of the main pipeline 1. The thickness of the first rope guide hose 3 and the second rope guide hose 4 is sufficient to pass the rope.

[0024] The rope guide hose and the main pipeline in the device for bending a pipeline to a specified position are both flexible hoses, such as a corrugated hose, which can be turned more smoothly.

[0025] Further, in another embodiment, Figure 1 and Figure 2 As shown, the front end of the main pipe 1 in the device for bending the pipe to a specified position is provided with a matching connecting sleeve 10, and the connecting sleeve 10 is provided with staggered opening seams, so that the connecting sleeve 10 forms staggered joints on the upper and lower sides at the opening seams. The connecting sleeve 10 can be opened and expanded along the opening seams, so that it is convenient to be sleeved on the front end of the main pipe 1. A docking screw hole 101 is provided on the connecting sleeve 10 at the opening seam, and the docking screw hole 101 radially penetrates the staggered joint part on the upper and lower sides of the opening seam on the connecting sleeve 10. The docking screw hole 101 is used to screw in the docking screw to fix the opening seam together, so that the connecting sleeve 10 is tightly held at the front end of the main pipe 1. A rope connection hole 102 is also provided on the connecting sleeve 10, and the front end of the rope is tied in the rope connection hole 102. In this embodiment, two ropes are provided, which are respectively connected to the rope connection holes on the left and right sides of the connecting sleeve 10. For ropes of other numbers, a corresponding number of rope connection holes can be provided on the connecting sleeve.

[0026] Further, in another embodiment, Figure 1 , Figure 3 and Figure 4 As shown, the tensioner in the device for bending a pipe to a specified position is a ratchet tensioner. Taking the first tensioner 7 as an example, combined with Figure 3 and Figure 4 As shown, the first tensioner 7 includes a clamping plate bracket and a ratchet rocker 72. The clamping plate bracket includes two clamping plates 71 with a protruding middle portion. The front and rear ends of the two clamping plates 71 are connected by bolts respectively. A U-shaped support plate 73 is provided at the lower middle side of the two clamping plates 71. The U-shaped support plate 74 is connected to the two clamping plates 71 by bolts. A ratchet shaft is provided between the protruding parts of the two clamping plates 71. A ratchet wire take-up drum 74 is provided on the ratchet shaft. A ratchet 75 is provided on each side of the ratchet wire take-up drum 74. The ratchet wire take-up drum 74 is provided with threading holes on the upper and lower sides. The front end of the pawl rocker 72 is hinged on the splint bracket, wherein the front end of the pawl rocker 72 is divided into two branch connecting rods 721, and the front end of the branch connecting rod 721 is hinged on the splint 71 on the corresponding side. In this embodiment, the front end of the branch connecting rod 721 is hinged on the ratchet shaft, so that the pawl rocker 72 can swing back and forth up and down. A pawl shaft is provided between the two branch connecting rods of the pawl rocker 72, and a pawl sleeve 76 is sleeved on the pawl shaft. Paws 77 matching the two ratchet wheels 75 in front are respectively integrated on both sides of the pawl sleeve 76, so that the ratchet wheel 75 can be driven to rotate unidirectionally through the pawl 77.

[0027] like Figure 4 As shown, one end of the first rope 5 passes through the threading holes on the upper and lower sides of the ratchet take-up drum 74, and is then connected to a bolt between the two clamping plates 71. At this time, the ratchet rocker 72 can be continuously pressed so that the ratchet 77 drives the ratchet 75 to tighten the first rope 5.

[0028] like Figure 4 As shown, a tensioning plate 78 is provided on the pawl sleeve 76, and a hole matching the pawl sleeve 76 is provided on the tensioning plate 78, so that the pawl sleeve 76 is inserted into the tensioning plate 78, and the top end of the tensioning plate 78 is tightened on the right branch connecting rod 721 by a spring. Through the friction between the hole of the tensioning plate 78 and the pawl sleeve 76, when the pawl rocker 72 is shaken, the pawl sleeve 76 will not rotate easily on the pawl shaft, so that the angle of the pawl 77 can always drive the ratchet 75 to rotate to tighten the rope. When the pawl sleeve 76 needs to be rotated to release the cooperation between the pawl 77 and the ratchet 75, the spring can be manually pulled to release the friction between the hole of the tensioning plate 78 and the pawl sleeve 76, so that the pawl sleeve 76 can be rotated to release the cooperation between the pawl 77 and the ratchet 75.

[0029] In one embodiment, a method for bending a pipe to a specified position is provided. The method adopts the device for bending a pipe to a specified position in the previous embodiment, combined with Figure 1 and Figure 5 As shown, the method comprises the following steps: (1) Operate the tensioner to relax the ropes passed through each rope guide hose.

[0030] Specifically, the first tensioner 7 and the second tensioner 8 are operated respectively to release the cooperation between the pawls and the ratchet wheels in the two tensioners, and the rope wrapped around the pawl sleeve is pulled out, so that the first rope 5 in the first rope guide hose 3 and the second rope 6 in the second rope guide hose 4 are in a relaxed state without hindering the turning of the main pipeline 1.

[0031] (2) The main pipeline, the flexible hose and the rope inside are fed into the cleaning hole at one side of the bottom of the storage tank 11, and a pump is connected to the rear end of the main pipeline.

[0032] When the main pipeline and the flexible hose together with the rope inside enter the cleaning hole at the bottom of the storage tank 11, the end of the pipeline can be sent forward by a long rod, and some target positions at the bottom of the storage tank 11 can be directly reached by the long rod. However, due to the small cleaning hole and the large volume of the storage tank 11, it is difficult to reach the end of the pipeline by the long rod. At this time, the end of the pipeline can be delivered to the target position by pulling the first rope 5 in the first rope guide hose 3 or the second rope 6 in the second rope guide hose 4.

[0033] (3) Observe the position of the residue at the bottom of the storage tank 11, and determine the direction in which the front end of the main pipeline needs to move based on the position of the residue. The direction in which the residue is located is the direction in which the front end of the main pipeline needs to move.

[0034] For example, if the position of the bottom residue in the storage tank 11 is on the right side of the main pipeline 1, the direction in which the front end of the main pipeline 1 needs to move is to the right.

[0035] (4) According to the direction in which the front end of the main pipeline needs to move, determine the rope that needs to be controlled. The rope on the side of the direction in which the front end of the main pipeline needs to move is the rope that needs to be controlled, and the tensioner connected to the rear end of the rope that needs to be controlled is the current control tensioner.

[0036] For example, if the direction in which the front end of the main pipeline 1 needs to move is to the right, the rope to be controlled is the second rope 6 in the second rope guide hose 4 on the right side of the main pipeline 1, and the current control tensioner to be controlled is the second tensioner 8 connected to the second rope 6 on the right side.

[0037] (5) Except for the rope that needs to be controlled, adjust the ropes connected to the other tensioners to a slack state.

[0038] For example, if the rope to be manipulated is the second rope 6, the first rope 5 is adjusted to a slack state.

[0039] (6) Operate the current control tensioner to tighten the rope to be controlled, thereby pulling the front end of the main pipeline toward the direction where the residue is located. Then operate the current control tensioner again to adjust the rope to be controlled to a relaxed state and then tighten it. In this way, the control is repeated until the front end of the main pipeline is pulled to the location where the residue is located.

[0040] For example, when the currently controlled tensioner to be controlled is the second tensioner 8 connected to the second rope 6 on the right, the second rope 6 is continuously tightened and loosened by controlling the second tensioner 8, so that the main pipeline 1 bends to the right until it reaches the target position.

[0041] (7) Start the pump and extract the residue at the bottom of the tank through the main pipeline.

[0042] Since the impurities at the bottom of the storage tank 11 are in the form of mud and sand, the pump used here needs to be a vacuum pump or a Roots pump.

[0043] Based on the above embodiments, it can be known that the method for bending the pipe to a specified position can flexibly and accurately move the end of the main pipe connected to the pump to the position where the silt and sediment impurities are located at the bottom of the storage tank by adopting a specially designed device for bending the pipe to a specified position, thereby solving the problem of cleaning the silt and sediment impurities in the storage tank. There is no need to manually enter the storage tank to clean the silt and sediment impurities, which solves the problem of inefficient cleaning caused by the complicated operating procedures of manual cleaning, and there is no risk of gas poisoning caused by personnel entering the tank body. In addition, by operating on the outside of the storage tank, there is no need to enter the storage tank for lighting and use electrically driven cleaning tools, thereby avoiding the risks of fire, explosion and electric shock, as well as the risk of slipping and falling.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for bending a pipe to a specified position, characterized in that: It comprises a main pipeline for extending into a storage tank to extract residues, the main pipeline is a bendable flexible hose, at least two rope guide hoses are symmetrically arranged on the periphery of the main pipeline, the rope guide hoses are fixed on the outside of the main pipeline, so that the main pipeline and the rope guide hoses can bend synchronously; a rope is passed through the rope guide hose, the front end of the rope is fixedly connected to the front end of the main pipeline, and the rear end of the rope is connected to a tensioner.

2. The device for bending a pipe to a specified position according to claim 1, characterized in that: The rope guide hose is provided with two, namely a first rope guide hose and a second rope guide hose, the first rope guide hose and the second rope guide hose are respectively arranged on the left and right sides of the main pipeline, a first rope is passed through the first rope guide hose, and a second rope is passed through the second rope guide hose.

3. The device for bending a pipe to a specified position according to claim 1, characterized in that: The rope-guided hose is tied to the outside of the main pipeline by tie bands arranged at intervals.

4. The device for bending a pipe to a specified position according to claim 1, characterized in that: A matching connecting sleeve is provided at the front end of the main pipe, and a staggered opening slit is provided on the connecting sleeve. A docking screw hole is provided on the connecting sleeve at the opening slit, for screwing in a docking screw to align and fix the opening slit, so that the connecting sleeve is clamped on the front end of the main pipe; a rope connecting hole is also provided on the connecting sleeve, and the front end of the rope is tied in the rope connecting hole.

5. The device for bending a pipe to a specified position according to claim 1, characterized in that: The wire tensioner is a ratchet wire tensioner, which includes a clamping plate bracket and a pawl rocker, a ratchet shaft is provided between the clamping plate brackets, a ratchet wire reel is provided on the ratchet shaft, a ratchet is provided on the ratchet wire reel, the front end of the pawl rocker is hinged on the clamping plate bracket, a pawl shaft is provided on the pawl rocker, a pawl sleeve is sleeved on the pawl shaft, and a pawl matching the ratchet is provided on the pawl sleeve.

6. A method for bending a pipe to a specified position, characterized in that: The method adopts the device for bending a pipe to a specified position according to any one of claims 1 to 5, and the method comprises: Operating the wire tensioner to make the ropes passing through each rope guide hose in a relaxed state; Feed the main pipeline, the flexible hose and the rope inside it into the cleaning hole of the storage tank, and connect a pump to the rear end of the main pipeline; Observe the position of the residue at the bottom of the storage tank, and determine the direction in which the front end of the main pipeline needs to move according to the position of the residue. The direction in which the residue is located is the direction in which the front end of the main pipeline needs to move; According to the direction in which the front end of the main pipeline needs to move, the rope that needs to be controlled is determined, the rope on the side of the direction in which the front end of the main pipeline needs to move is the rope that needs to be controlled, and the tensioner connected to the rear end of the rope that needs to be controlled is the current control tensioner; Except for the rope that needs to be controlled, the ropes connected to the other tensioners are adjusted to a slack state; The current control tensioner is operated to tighten the rope to be controlled, thereby pulling the front end of the main pipeline toward the direction where the residue is located, and then the current control tensioner is operated again to adjust the rope to be controlled to a loose state and then tighten it. In this way, the control is repeated until the front end of the main pipeline is pulled to the location where the residue is located; The pump is started to extract the residue at the bottom of the storage tank through the main pipeline.

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