Pipe Cleaning Device

Abstract

A tube cleaning device is provided. The device includes a hose (21), a nozzle (23), a gun (30), a hose feeder (40), and a restricting member (50). The hose is supplied with cleaning fluid from a pump (29). The nozzle is attached to the tip of the hose and faces the entrance of the pipe (92) to be cleaned, opposite a nozzle that sprays cleaning fluid into the pipe. The hose passes through the nozzle, allowing it to move back and forth along its length. The hose feeder feeds the hose between the gun and the pump. The restricting member restricts the hose's range of movement between the hose feeder and the pump. By restricting the hose's free movement, this device ensures safety during work and prevents wear and damage to the hose and cleaning device.

Description

[Technical Field]

[0001] The present invention relates to a device for cleaning the inside of a pipe (a pipe cleaning device). [Background technology]

[0002] Conventionally, when cleaning the inside of a pipe such as a heat exchanger, a cleaning liquid is supplied from a pump to a hose, and the hose is advanced and retracted by a drive device, causing a nozzle attached to the end of the hose to move back and forth within the pipe.

[0003] For example, Patent Document 1 (JP 2022-102545 A) describes a cleaning device for cleaning the inside of a pipe. The cleaning device has a feed roller (10) and a pressure roller (19) that clamp a hose (6). The feed roller (10) and the pressure roller (19) cooperate to form a hose feed device. The hose (6) advances and retreats by rotating the feed roller (10) forward or backward. Summary of the Invention [Problem to be solved by the invention]

[0004] In the cleaning device described in Patent Document 1, the nozzle (5) moves back and forth inside the object to be cleaned (such as a heat exchanger tube) with the hose (6) as the feed roller (10) rotates forward or backward, so considering the cleaning work, it is necessary to ensure that the hose (6) is long enough to be at least as long as the distance from the cleaning device to the tip of the object to be cleaned (the amount of hose feed). In particular, before the cleaning device starts operation or when the feed roller (10) rotates backward, if the hose (6) has a high degree of freedom between the feed roller (10) and the pump (P), the hose (6) may move freely in a narrow work site or other environment where movement is difficult, and part or all of the hose (6) may collide with a worker, potentially causing injury.

[0005] In addition, as the hose (6) moves freely in all directions, it may come into excessive contact with the ground surface, causing wear or damage to the surface of the hose (6). Furthermore, if the hose (6) is forced into the conduit (3) while it is bent, the cleaning device may not operate properly (may cause a malfunction).

[0006] The purpose of this invention is to provide a pipe cleaning device that can ensure safety during work by restricting the free movement of the excess hose, and can prevent wear and damage to the hose and cleaning device. [Means for solving the problem]

[0007] The first aspect of the present invention is: A hose through which the cleaning liquid supplied from the pump flows; a nozzle attached to a tip of the hose for spraying the cleaning liquid into the pipe to be cleaned; a gun facing the inlet of the pipe and through which the hose passes in a longitudinal direction thereof; a hose feeder for feeding the hose back and forth between the gun and the pump; a restricting member that applies tension in the direction of gravity and restricts the range of movement of the hose between the hose feed device and the pump as the hose moves back and forth; A pipe cleaning device having:

[0008] The restricting member may include a stand for supporting the hose by suspending it. The restraining member may comprise a stand for supporting the hose while applying a lifting force to the hose.

[0009] The stand may support the hose above the hose feeder. The stand may include a base, a support pole extending upward from the base, and a hook supported by the support pole and for hanging a hose. The stand may be provided with a weight balance adjuster for adjusting the amount of hanging of the hose.

[0010] The hose feeder and the stand may be disposed opposite each other so that the hose reciprocates on the same straight line in a plan view.

[0011] The pipe cleaning device may have a coil member between the gun and the hose feeder, through which at least a portion of the hose passes. The coil member reduces the sliding resistance of the hose against the ground surface. The coil member has a spiral shape, which allows the hose greater freedom of movement compared to a cylindrical shape. Furthermore, the coil member may have a protective tube surrounding a portion of the entire length of the coil member in the longitudinal direction. Considering splashing of the cleaning liquid and safety, it is desirable to place a protective tube near the gun. The coil member may be connected to at least one of the gun and the hose feeder. The phrase "connected to at least one" encompasses cases where the coil member is connected to either the gun or the hose feeder, and cases where the coil member is connected to both the gun and the hose feeder.

[0012] The pipe cleaning device may have a stopper fixed to the hose between the feeder and the pump, and a buffer member extending from the hose feeder toward the pump, through which the hose passes and which buffers the impact when the stopper collides. The stopper may include a stopper body that projects like a flange from the outer peripheral surface of the hose, and a stopper protection member that projects from the outer peripheral surface of the stopper body and protects the stopper body. [Effects of the Invention]

[0013] According to this invention, by restricting the free movement of the excess hose, safety during work can be ensured and wear and damage to the hose and cleaning device can be prevented. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view showing a pipe cleaning device according to an embodiment of the present invention; [Figure 2] Cross-sectional view showing the gun and its surroundings [Figure 3]A perspective view showing the internal structure of the feeding device and its surroundings. [Figure 4] FIG. 10 is a perspective view showing a modified example of the stand; [Figure 5] FIG. 10 is a perspective view showing another example of a restricting member of the pipe cleaning device. [Figure 6] FIG. 10 is a perspective view showing another example of a stand for a pipe cleaning device. DETAILED DESCRIPTION OF THE INVENTION

[0015] As shown in Figure 1, the pipe cleaning device 10 of the first embodiment of the present invention is intended to clean the pipes 92 of a heat exchanger 90. Heat exchangers 90 are installed in thermal power plants, factory facilities, and other facilities that handle materials or liquids that need to be cooled, and may be located in environments with narrow passageways that make it difficult for workers to move around. In such cases, the pipe cleaning device 10 must be brought into an open space to perform the cleaning work. There has been a demand for a system that ensures ease of operation even in such narrow spaces. The heat exchanger (heat exchange chamber) 90 has a tube group 91, an outer casing 93, and a pair of partition walls 95. A part of the heat exchange chamber 90 is shown in Figures 1 and 2. The tube group 91 is housed inside the heat exchange chamber 90.

[0016] The tube group 91 is made up of a plurality of (10 to 100, etc.) tubes 92 arranged in parallel. The outer cylinder 93 surrounds the tube group 91. A pair of open ends is formed at both ends of the outer cylinder 93. A pair of partition walls 95 separately closes the pair of open ends of the outer cylinder 93 and also separately supports both ends of the multiple tubes 92.

[0017] As shown in FIG. 1, the pipe cleaning device 10 includes a hose 21, a nozzle 23, a gun 30, a hose feed device 40, a regulating member 50, a coil member 25, a protective tube 27, a buffer member 71, a stopper 73, and a pump 29.

[0018] The restricting member 50 is formed by, for example, hanging a portion of the hose 21 above (for example, at a height of 1.0 to 5.0 meters, preferably 1.5 to 2.5 meters) that is longer than the length from the cleaning device to the tip of the object to be cleaned, and using the hanging point as a fulcrum. As a result, tension in the direction of gravity is applied to the hanging portion of the hose 21, and the weight of the hose 21, which branches in two directions relative to the fulcrum, and the weight of the water passing through it are also added, which stabilizes the center of gravity of the hose 21 and reduces the lateral (radial) vibration of the hose 21. With this effect, the restricting member 50 restricts the free-flowing movement of the hose 21. Applying tension in the direction of gravity to the hose 21 maintains the hose 21 in an overall stable position. In addition, the center of gravity of the hose 21 is positioned downward, with the hanging point serving as a fulcrum, and the gravitational moment acts as a restoring force, so that even if the hose 21 twists or swings, the hose 21 will return to a stable position on its own. Furthermore, maintaining a stable position eliminates slack in the hose 21, which leads to creating a state in which the hose 21 is less likely to twist or swing. Considering the slack of the hose 21 before the pipe cleaning device 10 is operated or when the rotation of the hose feed device 40 is reversed, it is desirable that the regulating member 50 be configured as a stand 51 and installed between the hose feed device 40 and the pump 29.

[0019] The stand 51 has a base 52 , a support 53 , an arm 54 , and a hook 55 . The base 52 supports the upper portion of the stand 51 and supports the support column 53 from below so that the support column 53 is parallel to the vertical direction. It is desirable that the base 52 be stably fixed to the ground. For example, as shown in FIG. 4, an anchor may be used as a first fixing device 521, and the anchor may be driven into the ground so that it penetrates the base 52. The base 52 and the support column 53 can also be fixed and adjusted in position by a second fixing device 522, as shown in FIG. 4. The second fixing device 522 has a pair of dividers 523. The pair of dividers 523 are fixed to the base 52 in a manner that cooperates to surround the lower end of the support column 53. The weight of the second fixing device 522 stabilizes the stand 51. In this way, the first fixing device 521 and the second fixing device 522 can prevent the stand 51 from tipping over. It should be noted that while it is necessary to be able to be fixed in place during cleaning work, mobility can be improved when moving it by arranging rollers or other travel aids on the bottom or sides of the base 52. By moving the stand 51 when changing the work location, operability during work can be improved, and by appropriately setting the hanging position of the hose 21 to an appropriate position, the free movement of the hose 21 can be restricted.

[0020] An arm 54 is fixed to the upper part of the support column 53. The arm 54 extends laterally from the support column 53. The arm 54 may be straight or curved, but if it is too long, the balance of the center of gravity will become unstable, so it is desirable that the arm be relatively close to the support column 53 and have a length (size) that will stabilize the center of gravity.

[0021] A hook 55 is fixed to the arm 54. The hook 55 is passed through, for example, a through-hole 541 formed in the arm 54. The hose 21 is hung on the hook 55. The hook 55 is, for example, a J-shaped metal fitting, a band with a fastener, a carabiner, or a combination of these. The band is maintained in a circularly deformed state by the fastener. Furthermore, to prevent the hose 21 from falling off the hook 55, an auxiliary tool such as a roller with a U-shaped groove formed around its entire circumference can be placed near the hook 55, and the hose 21 can be passed through the groove of the auxiliary tool.

[0022] The position at which the hook 55 suspends and supports the hose 21 is higher than the positions of the hose feeder 40 and the buffer member 71. For example, by setting the hook 55 to be located two to five times higher than the height of the hose feeder 40 (the height from the ground to the top end of the hose feeder 40), the weight and overall shape of the stand 51 can be designed so that the stand 51 will not tip over or move even if the hose 21 threaded through the hook 55 moves. Furthermore, the position of the center of gravity can be adjusted by adjusting the length of the hook 55 disposed on the arm 54. For example, in a state in which the height of the stand 51 cannot be changed, the position of the center of gravity can be raised and the swinging of the hose 21 can be suppressed by adjusting and disposing the hook 55 at a higher position.

[0023] Furthermore, the hose feeder 40 and the stand 51 can be arranged opposite each other so that the hose 21 moves back and forth along the same straight line in a plan view. If the hose feeder 40 and the stand 51 are not arranged in this way, an extra length of the hose 21 would be required, so by arranging them opposite each other in this way, the optimal length of the hose 21 can be achieved and the hose 21 can be prevented from moving freely in all directions.

[0024] Additionally, the provision of a lifting mechanism makes it possible to optimize the adjustment of the height position that serves as the fulcrum for the hose 21. In situations where the aisle (width) or height at the work site is limited, the ability to change the height as well when changing the fixed position of the stand 51 allows the pipe cleaning device 10 to be used in accordance with the conditions at the work site.

[0025] As shown in FIG. 4, the stand 51 can also have a weight balance adjuster 56 (e.g., a weight of 1 to 3 kg) attached to one or both (both in FIG. 4) of the hose 21, which branches in two directions relative to the point where it is hung by the hook 55. The weight balance adjuster 56 is annular, and the hose 21 passes through it. In addition to the state where the center of gravity is stabilized by being hung by the hook 55, intentionally adding weight from both sides using the weight balance adjuster 56 creates three fulcrums for the hose 21, creating a more stable state. Furthermore, the weight of the weight balance adjuster 56 shortens the hanging length of the hose 21, creating a more stable state. However, because the hose 21 moves in the longitudinal direction when the pipe cleaning device 10 is in operation, the weight balance adjuster 56 may be hung auxiliary from the arm 54 via a wire and positioned lower than the hook 55.

[0026] In this embodiment, a portable stand 51 is described, but the regulating member 50 is not limited to a stand. For example, as shown in FIG. 5, when a pair of support posts 63 and a base 62 supporting each support post 63 are already installed at the work site, a horizontal bar-shaped member 59 may be fixed in a state in which it spans the pair of support posts 63, a hook 55 or the like may be placed near the center of the horizontal bar-shaped member 59, and the hose 21 may be hung from the hook 55, or the hose 21 may be hung from a single pipe or part of scaffolding material already installed at the work site, although this is not shown.

[0027] It is also possible to use a hose storage device (not shown) that can store the entire hose 21 as the regulating member 50. However, because the nozzle 23 and hose 21 in the pipe cleaning device 10 move back and forth at high speeds, there is a possibility that the time to store the hose 21 in the hose storage device is insufficient, or that the stored hose 21 does not move back and forth properly. Furthermore, in many cases where work sites are narrow and space is limited, moving a heavy hose storage device can cause excessive workloads for workers. Therefore, using the regulating member 50 using the stand 51 or the like in this embodiment is advantageous in terms of mobility, etc.

[0028] A nozzle 23 is connected to the tip of the hose 21. Cleaning liquid is sprayed from the nozzle 23. A pump 29 is connected to the end of the hose 21. Cleaning liquid is supplied from the pump 29 into the inside of the hose 21. The hose 21 is flexible. Two hoses 21 may be connected with a joint. A rapid increase in water pressure inside the hose 21 may cause the hose 21 to meander. To prevent meandering, a soft start valve or a proportional control valve may be provided on the joint of the hose 21 or on the pump 29, and the flow rate may be gradually increased before preparation for work. Furthermore, when cleaning liquid is sprayed from the nozzle 23, a reaction force may be generated. If the tip of the nozzle 23 shakes excessively, this may induce shaking not only of the nozzle 23 but also of the hose 21. For this reason, an adjustment tool (lightweight weight) not shown may be provided around the nozzle 23.

[0029] 1 and 2, the gun 30 has an insertion portion 31, a conduit 33, a grip 35, and a discharge pipe 37. The grip 35 is not clearly shown in FIG. The inside of the conduit 33 is a cylindrical space. The hose 21 and the nozzle 23 are passed through the inside of the conduit 33 so that they can move back and forth. A switch (not shown) is attached around the conduit 33 to start and stop spraying of the cleaning liquid and to start and stop driving of the hose feed device 40. The insertion portion 31 is inserted into the entrance of the pipe 92 to close the entrance. The insertion portion 31 is cylindrical. The outer surface of the insertion portion 31 is frusto-conical, with the outer diameter decreasing toward the tip. One open end of the conduit 33 is connected to the end of the insertion portion 31. The hose 21 and the nozzle 23 can move between the inside and outside of the insertion portion 31 in the direction in which the insertion portion 31 penetrates.

[0030] One end of the coil member 25 is connected to the other open end of the conduit 33, and the other end is connected to the hose feed device 40. The hose 21 is passed through the inside of the coil member 25. The coil member 25 surrounds the hose 21, thereby reducing the sliding resistance of the hose 21 against the ground surface. The coil member 25 has a spiral shape, which also increases the degree of freedom of movement of the hose 21 compared to a cylindrical shape. The coil member 25 is preferably made of a compression coil spring.

[0031] The protective tube 27 is preferably flexible. A portion of the entire longitudinal length of the coil member 25 is passed through the protective tube 27. Placing the protective tube 27 over the entire longitudinal length of the coil member 25 would reduce the freedom of extension and contraction of the coil member 25, so the protective tube 27 is placed only over a portion of the entire longitudinal length of the coil member 25. By placing the protective tube 27 around a portion of the entire longitudinal length of the coil member 25, the surface of the coil member 25 can be protected from damage in the portion surrounded by the protective tube 27 and foreign matter can be prevented from entering through gaps in the spiral of the coil member 25 and adhering to the hose 21. When foreign matter is not attached to the hose 21, the hose 21 can easily move back and forth between the coil member 25, the gun 30, and the hose feeder 40. In this embodiment, one end of the protective tube 27 is connected to the end (conduit 33) of the gun 30. A sufficient space is formed between the other end of the protective tube 27 and the hose feeder 40. When the cleaning liquid is sprayed from the gun 30 onto the heat exchanger 90, the cleaning liquid flows back from the heat exchanger 90 and is discharged from the discharge pipe 37 of the gun 30. The portion of the cleaning liquid that is not discharged from the discharge pipe 37 flows back into the protective pipe 27 and is discharged from the other end of the protective pipe 27. Although different from the present embodiment, the protective pipe 27 may be connected to the hose feeder 40, and the protective pipe 27 may surround the coil member 25 near the hose feeder 40. Specifically, one end of the protective pipe 27 may be connected to the hose feeder 40, and the other end of the protective pipe 27 may be separated from the gun 30. The pipe cleaning device 10 may also have a pair of protective pipes 27, with one protective pipe 27 connected to the gun 30 as in the present embodiment and the other protective pipe 27 connected to the hose feeder 40. In this configuration, the coil member 25 is surrounded inside the pair of protective pipes 27, and the coil member 25 is exposed to the outside in the area between the pair of protective pipes 27.

[0032] The hose feeding device 40 is installed between the gun 30 and the pump 29. The hose feeding device 40 feeds the hose 21 in a straight line along its longitudinal direction toward the gun 30 and retracts it toward the pump 29. The direction in which the hose 21 is fed out and retracted is hereinafter referred to as the conveying direction. The hose feeding device 40 transports the hose 21 at a speed of, for example, 100 m / min to 150 m / min. When two hoses 21 are connected with a joint, a hose blow-off prevention wire or the like may be provided and both ends of the hose blow-off prevention wire may be connected to the two hoses 21 in advance to ensure safety even if the hose 21 becomes detached at the joint. Alternatively, when two hoses 21 are connected with a joint, a swivel joint or the like may be used to prevent twisting of the hose 21. An example of a hose blow-off prevention wire is a metal wire secured with a bolt or metal fitting.

[0033] 3, hose feeder 40 has a feed-out section 41, a plurality of pressure rollers 46, a frame 47, a support mechanism section 48, a base 49, and a rotation drive device (not shown). Hose feeder 40 may have a housing. Hose feeder 40 is housed inside the housing except for base 49.

[0034] The plurality of pressure rollers 46 are arranged above the hose 21 in the conveying direction. The support mechanism 48 rotatably supports the plurality of pressure rollers 46 in a suspended state. The support mechanism 48 is fixed to the frame 47.

[0035] The delivery section 41 is disposed below the hose 21. The delivery section 41 has a drive pulley 42, a driven pulley 43, an endless belt 44, and a roller 45. The drive pulley 42, the driven pulley 43, and the roller 45 are disposed directly below and facing the pressure roller 46. The drive pulley 42 and the driven pulley 43 are disposed at an interval in the conveying direction. The roller 45 is disposed between the drive pulley 42 and the driven pulley 43 in the conveying direction. The drive pulley 42, the driven pulley 43, and the roller 45 are rotatably supported by a frame 47. The drive pulley 42 is rotated by a rotary drive device. The endless belt 44 is wound around the drive pulley 42 and the driven pulley 43 in a circular shape when viewed horizontally. The upper surface of the roller 45 contacts the inner circular surface of the endless belt 44.

[0036] The rotary drive device is, for example, a motor. When the motor rotates forward or backward, the drive pulley 42 rotates. In accordance with the direction of rotation of the drive pulley 42, the endless belt 44 rotates, and the driven pulley 43 and roller 45 rotate. As a result, the hose 21 is fed out or retracted.

[0037] The base 49 supports the frame 47 from below. The base 49 has a plurality of legs 491. The plurality of legs 491 support the frame 47 so that it is raised above the ground.

[0038] The frame 47 has a frame main body 471, a first connecting portion 473, and a second connecting portion 475. The frame main body 471 is used to attach various components. The first connecting portion 473 and the second connecting portion 475 are arranged at both ends of the frame main body 471 (hose feed device 40) in the conveying direction. The first connecting portion 473 and the second connecting portion 475 are plates. A through hole for passing the hose 21 is formed in the first connecting portion 473 and the second connecting portion 475. The second connecting portion 475 is arranged closer to the pump 29 in the conveying direction. The first connecting portion 473 is arranged closer to the gun 30 in the conveying direction. The first connecting portion 473 is a portion for fixing the coil member 25. The second connecting portion 475 is a portion for fixing the buffer member 71.

[0039] The buffer member 71 is a compression coil spring. The stopper 73 protrudes from the outer peripheral surface of the hose 21 in a flange-like shape. The stopper 73 can collide with the buffer member 71. By absorbing the impact of the collision, it is possible to prevent the stopper 73 from shifting position relative to the hose 21. The stopper 73 is fixed to the hose 21 and moves back and forth with the hose 21 as the hose feed device 40 operates. However, since the stopper 73 is exposed like the hose 21, it is desirable to configure the stopper 73 to minimize wear on the ground surface as it moves along the ground surface. To achieve this, as shown in FIG. 3, the stopper 73 includes a stopper main body 73a that protrudes from the outer peripheral surface of the hose 21 in a flange-like shape and can collide with the buffer member 71, and a stopper protection member 73b that protrudes from the outer peripheral surface of the stopper main body 73a and protects the stopper main body 73a. The stopper protection member 73b is desirably detachable from the stopper main body 73a. For example, the stopper 73 may use multiple protrusions 73b as stopper protection members 73b as shown in the example, and the multiple protrusions 73b may be arranged at intervals in the circumferential direction of the outer periphery of the stopper body 73a. In the example shown, the protrusions 73b are fixed immovably to the stopper body and are stripes that run along the longitudinal direction of the hose 21. Alternatively, to facilitate movement on the ground surface, the stopper 73 may use multiple rollers (not shown) as stopper protection members, and the multiple rollers may be rotatably fixed to the stopper body 73a and arranged so that some of the rollers protrude from the surface of the stopper body 73a.

[0040] When the rotary drive device rotates the drive pulley 42 in the forward direction and feeds out the hose 21, the stopper 73 eventually collides with the buffer member 71, preventing the hose 21 from being fed out. The positions of the buffer member 71 and the stopper 73 can be adjusted, thereby determining a limit to the amount of hose 21 that can be fed out. The hose feed device 40 may have a sensor (not shown) that detects when the stopper 73 collides with the buffer member 71. Upon receiving a detection signal from the sensor, the hose feed device 40 controls the rotation of the drive pulley 42. Although not shown, the pipe cleaning device 10 may have a configuration that determines a limit to the amount of retraction of the hose 21, and a sensor that detects the limit of the retraction amount.

[0041] Furthermore, a position sensor may be disposed in a portion of each of the regulating member 50 and the hose feeder 40, so that the regulating member 50 and the hose feeder 40 can be arranged in a straight line. If the position of the regulating member 50 including the stand 51 and the position of the hose feed device 40 are linear, the path of the hose 21 can be kept to the shortest distance, and unnecessary swinging of the hose 21 can be avoided.

[0042] The tube cleaning device 10 is used as follows. 1) The pipe cleaning device 10 is carried into the work site (near the heat exchanger 90). A stand 51 is installed between the hose feeder 40 and the pump 29. An extra length of the hose 21 is hung from the stand 51, the length (distance) of which is from the pipe cleaning device 10 to the tip of the object to be cleaned. 2) The operator fits the insertion portion 31 into the entrance of the pipe 92, operates the switch of the gun 30, and sprays the cleaning liquid into the pipe 92. 3) The operator operates the switch of the gun 30 to drive the rotary drive device and rotate the drive pulley 42 in the forward direction. The hose 21 moves forward and is fed into the inside of the pipe 92. When the stopper 73 collides with the buffer member 71, the forward movement of the hose 21 stops. 4) The operator operates the switch on the gun 30 to drive the rotary drive device and reverse the drive pulley 42. The hose 21 retracts and is drawn back into the gun 30 from inside the pipe 92. Some of the sprayed cleaning liquid flows back into the gun 30 and is discharged to the outside through the discharge pipe 37.

[0043] When the hose 21 is sent out and pulled back while the cleaning liquid is being sprayed, the hose 21 tries to move freely. By hanging a part of the hose 21 from above, the hanging part becomes a fulcrum, and tension in the direction of gravity is applied to the hanging part of the hose 21, stabilizing the center of gravity of the hose 21, thereby reducing the lateral swing of the hose 21 (in the radial direction toward the outside), and restricting the free-flowing movement of the hose 21. Furthermore, the weight of the water passing through the hose 21 and the weight of the hose 21 are added to the suspended portion of the hose 21, restricting the range of movement of the hose 21.

[0044] The stand 51 is lightweight because it does not have an actuator such as a motor. The stand 51 is easy to carry, and installation and removal are easy. Even though the stand 51 does not have an actuator, its configuration restricts the movement range of the hose 21.

[0045] Hose 21 is passed through the inside of coil member 25, reducing the sliding resistance of hose 21. Coil member 25 has a spiral shape, which allows hose 21 greater freedom of movement compared to a cylindrical shape. Furthermore, the buffer member 71 can reduce the impact when the stopper 73 collides, thereby preventing the stopper 73 from shifting in position relative to the hose 21, for example.

[0046] 6, the stand 51A of the second example hoists and supports the hose 21. The stand 51A has a base 52, a support 53A, a slider 57, and a pulley device 80.

[0047] The support pillar 53A has a straight rod shape. The support pillar 53A has a pillar 531 and a guide rod 532. The guide rod 532 is fixed on top of the pillar 531. The guide rod 532 is thinner than the pillar 531. The slider 57 is guided along the support 53 A so as to be able to move up and down. The slider 57 has an arm 54 and a guide pipe 58. The guide pipe 58 is passed through a guide rod 532 and can be raised and lowered along the guide rod 532 . The arm 54 extends laterally from the side of the guide pipe 58 .

[0048] Pulley device 80 has a weight 81, a rope 82, and a fixed pulley 83. Fixed pulley 83 is fixed to the top of stand 51A. Fixed pulley 83 has a pulley 84, an axle 85, and a bracket 86. Bracket 86 is a metal plate bent into a U-shape. Bracket 86 is fixed to the upper end of guide rod 532 with its opening facing upward. Bracket 86 determines the limit position to which guide pipe 58 can rise. Pulley 84 is rotatably supported by bracket 86 via axle 85. Pulley device 80 may have a movable pulley. The rope 82 is wound around a pulley 84. One end of the rope 82 is fixed to the weight 81. The other end of the rope 82 is fixed to the arm 54. In the example shown in the figure, a fixture 543 having a hole through which the rope 82 is passed is attached to the arm 54.

[0049] Stand 51A of the second example converts the downward force of weight 81 into a lifting force using pulley device 80 to support hose 21. As a result, an upward force (lifting force) is constantly applied to hose 21. The upward force applies tension to hose 21. When pipe cleaning device 10 is used in this state and hose 21 is advanced or retracted while spraying cleaning liquid, the range of movement of hose 21 can be made more stable by the amount of tension applied to hose 21 compared to stand 51 of the previous example.

[0050] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the gist of the present invention, and all technical matters included in the technical idea described in the scope of the utility model registration claims are covered by the present invention. The above-described embodiments are preferred examples, but a person skilled in the art can realize various alternatives, modifications, variations, or improvements from the contents disclosed in this specification, and these are included in the technical scope described in the scope of the attached utility model registration claims. [Explanation of symbols]

[0051] 10 Pipe cleaning device 21 Hose 23 nozzles 29 Pump 30 Gun 37 Discharge pipe 40 Hose Feeder 50 Regulatory components

Claims

1. A hose through which the cleaning liquid supplied from the pump flows; a nozzle attached to a tip of the hose for spraying the cleaning liquid into the pipe to be cleaned; a gun facing the inlet of the pipe and through which the hose passes in a longitudinal direction thereof; a hose feeder for feeding the hose back and forth between the gun and the pump; a restricting member that applies tension in the direction of gravity and restricts the range of movement of the hose between the hose feed device and the pump as the hose moves back and forth; A tube cleaning device comprising:

2. The pipe cleaning device according to claim 1 , wherein the restricting member comprises a stand for supporting the hose by suspending it.

3. The pipe cleaning device of claim 2 , wherein the stand supports the hose above the hose feeder.

4. The pipe cleaning device according to claim 2 , wherein the hose feeder and the stand are arranged opposite each other so that the hose reciprocates along the same straight line in a plan view.

5. The stand includes a base, a support pole extending upward from the base, and a hook supported by the support pole and for hanging the hose. The pipe cleaning device according to any one of claims 1 to 4, comprising:

6. The pipe cleaning device according to claim 5 , wherein the stand further comprises a weight balance adjuster for adjusting the amount of hanging of the hose.

7. 5. The pipe cleaning device according to claim 1, further comprising a coil member between the gun and the hose feeder, through which at least a portion of the hose passes.

8. a stopper fixed to the hose between the feeding device and the pump; a buffer member extending from the hose feed device toward the pump, through which the hose passes, and which buffers an impact when the stopper collides; The pipe cleaning device according to any one of claims 1 to 4, comprising:

9. The stopper includes a stopper body that projects from the outer peripheral surface of the hose in a flange-like shape, and a stopper protection member that projects from the outer peripheral surface of the stopper body and protects the stopper body.

9. The tube cleaning device of claim 8, comprising:

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