Air duct cleaning device

Abstract

To provide an air duct cleaning device which improves workability during cleaning compared to conventional cleaning devices while enabling the entire part of an air duct to be cleaned completely.SOLUTION: An air duct cleaning device 10 includes: a first placement part 11 on which a contracted air duct 1 may be placed; a cleaning liquid jet part 13 capable of jetting a cleaning liquid to the air duct 1; and a gas jet part 14 capable of jetting a gas to the air duct 1 and further includes an oblique guide part 15 which may guide the air duct 1 in an oblique upward direction while pulling and extending the air duct 1 placed on the first placement part 11. In this case, the cleaning liquid jet part 13 and the gas jet part 14 are arranged so as to be able to jet the cleaning liquid and the gas to the air duct 1 which is guided in the oblique upward direction by the oblique guide part 15.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an air duct cleaning device. [Background technology]

[0002] Conventionally, when carrying out work in underground spaces or enclosed spaces, such as work in sewers or underground communication lines, ventilation, supply, or exhaust has been carried out through a portable air pipe (also called a duct).

[0003] When the air pipes are used, their surfaces become dirty, so they need to be cleaned after use. For this reason, workers have had to manually clean the air pipes using high-pressure cleaners or the like. However, since the length of the air pipes reaches several meters, it is very time-consuming to manually clean the air pipes while stretching them out by hand, and the work takes a lot of time. In addition, if the air pipes are left as they are after cleaning, they will emit a foul odor, so it is necessary to hang each air pipe after cleaning to dry, which is also one of the factors that leads to a significant increase in work time.

[0004] In order to solve the above problem, for example, Patent Document 1 proposes a portable air duct cleaning device. That is, this cleaning device is equipped with a cleaning tank that is open at the top and capable of storing the contracted air duct, a cleaning water injection unit that can inject cleaning water onto the inner and outer circumferential surfaces of the air duct when the air duct is stretched upward while stored in the cleaning tank, and an air injection unit that can inject air onto the inner and outer circumferential surfaces of the air duct, and is capable of washing away dirt on the air duct surface by injecting cleaning water onto the air duct in an upwardly stretched state, and of blowing away the cleaning water by injecting air onto the washed-out area. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2002-320939 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the cleaning device according to the conventional technology, it is necessary to pull up the upper end of the air pipe from the state where it is folded and stored inside the cylindrical cleaning tank, but since the air pipe is long, in the form shown in the figure, the worker must reach inside the cleaning tank to pull it out, which is very inefficient. Also, when storing the air pipe, if the end of the air pipe is held from the beginning and the remaining part of the air pipe is stored, the end of the air pipe cannot be cleaned at all.

[0007] In view of the above circumstances, the present invention provides an air duct cleaning device that can clean the entire air duct without leaking and has excellent workability during cleaning. [Means for solving the problem]

[0008] The above-mentioned problems are solved by an air duct cleaning device according to the present invention. That is, this cleaning device is a device for cleaning an expandable air duct, and includes a first placement part on which the air duct in a contracted state can be placed, a cleaning liquid jetting part capable of jetting cleaning liquid into the air duct, and a gas jetting part capable of jetting gas into the air duct, and is characterized in that the cleaning device further includes an oblique guide part capable of guiding the air duct diagonally upward while stretching the air duct placed on the first placement part, the cleaning liquid jetting part is arranged so as to jet cleaning liquid into the air duct guided diagonally upward by the oblique guide part, and the gas jetting part is arranged so as to jet gas into the air duct forward in the guide direction from the region where the cleaning liquid is jetted.

[0009] In this way, the air pipe cleaning device according to the present invention is provided with an oblique guide section capable of guiding the air pipe diagonally upward while stretching the air pipe in the placed state, so that the air pipe can be stretched while being supported by the oblique guide section. Therefore, the air pipe can be stretched smoothly with less burden on the operator compared to the conventional case of stretching it vertically upward. In addition, since the cleaning liquid and gas can be sprayed onto the air pipe guided diagonally upward by the oblique guide section, the cleaning liquid and gas can be sprayed onto the end of the air pipe located at the most forward side in the guide direction. Therefore, even when the air pipe is stretched from a contracted state, it is possible to clean the entire air pipe without leakage and remove the cleaning liquid to achieve early drying. As described above, the air pipe cleaning device according to the present invention makes it possible to improve the workability during cleaning while cleaning the entire air pipe without leakage.

[0010] In the air duct cleaning device according to the present invention, the oblique guide portion may have a pair of guide bars extending parallel to each other and obliquely upward and capable of supporting the lower portion of the air duct.

[0011] Since the air pipe is usually cylindrical, by configuring the oblique guide portion as described above, the position of the air pipe supported by the pair of guide bars when it is stretched is stabilized. This allows the air pipe to be stretched while being supported more stably, and it is possible to further improve the workability of the cleaning process that involves stretching the air pipe. Furthermore, if the air pipe can be guided obliquely upward by the pair of guide bars, most of the space around the air pipe will be free, so the worker can stretch the air pipe relatively freely without worrying about interference with the oblique guide portion. Therefore, it is particularly excellent in terms of workability.

[0012] In addition, in the air duct cleaning device according to the present invention, when a pair of guide bars are provided, the oblique guide portion may further have a pair of first curved portions located on the rear side of the pair of guide bars in the guide direction, curved obliquely upward from below, and connected to the pair of guide bars.

[0013] By configuring the oblique guide portion in this manner, the air pipe extended upward from the pair of first placement portions can be smoothly introduced onto the pair of guide bars, thereby making it possible to further improve the workability in extending the air pipe.

[0014] Furthermore, in the air duct cleaning device according to the present invention, the cleaning liquid spraying section may have a cleaning liquid supply pipe that extends upward from the first mounting section and then curves and extends diagonally upward, and an inner surface cleaning liquid spraying section that is provided at the tip side of the cleaning liquid supply pipe and is capable of spraying cleaning liquid onto the inner surface of the air duct.

[0015] By configuring the cleaning liquid spraying part in this way, the inner space of the air duct in the state where it is stretched diagonally upward can be used to clean the inner surface of the air duct. Therefore, it is possible to spray the cleaning liquid easily and smoothly without the need to insert a nozzle or the like into the inside of the stretched air duct. Of course, at this time, the air duct is held in a predetermined position and posture by the pair of guide bars or other oblique guide parts, so there is no risk of interference between the pair of guide bars and the cleaning liquid supply pipe (or the inner surface cleaning liquid spraying part).

[0016] In this case, in the air duct cleaning device according to the present invention, the cleaning liquid supply pipe may be configured to be rotatable about a vertical axis.

[0017] By making the cleaning liquid supply pipe rotatable about its axis as described above, the direction of the tip of the cleaning liquid supply pipe can be changed. If the tip of the cleaning liquid supply pipe can be oriented in a direction different from the guide direction of the air pipe by the oblique guide part, it becomes possible to easily place the air pipe in the contracted state on the first placement part while avoiding interference with a part of the oblique guide part located forward in the guide direction of the cleaning liquid supply pipe, such as a pair of guide bars.

[0018] The air duct cleaning device according to the present invention may further include a second mounting part on which the air duct that has been subjected to a cleaning process by the cleaning liquid spraying part can be placed in a contracted state. In this case, the gas spraying part may have a gas supply pipe that extends upward from the second mounting part and then curves and extends diagonally downward, and an inner surface gas spraying part that is provided at the tip side of the gas supply pipe and can spray gas onto the inner surface of the air duct.

[0019] By configuring the gas injection unit in this way, it is possible to use the inner space of the air duct stretched diagonally upward to inject gas onto the inner surface of the air duct. This makes it possible to easily and smoothly inject gas and blow away cleaning liquid adhering to the inner surface without the need to insert a nozzle or the like into the inside of the stretched air duct. Of course, at this time, the air duct is held in a predetermined position and posture by the pair of guide bars or other oblique guide parts, so there is no risk of interference between the pair of guide bars and the gas supply pipe (or the inner surface gas injection unit).

[0020] The air duct cleaning device according to the present invention may further include an annular member disposed around the oblique guide portion. In this case, the cleaning liquid jetting unit may further include an outer surface cleaning liquid jetting unit provided on the inner surface of the annular member and capable of jetting cleaning liquid toward the outer surface of the air duct. Alternatively, the gas jetting unit may further include an outer surface gas jetting unit provided on the inner surface of the annular member and capable of jetting gas toward the outer surface of the air duct.

[0021] The annular member disposed around the oblique guide portion can keep its axial dimension to a minimum, so that the annular member can function as a cleaning liquid spray portion for the outer surface of the air duct and as a gas spray portion while being structured to interfere as little as possible with the operation of extending the air duct.

[0022] In addition, when the second mounting portion is provided, the air duct cleaning device according to the present invention may further include a pair of arm portions that enable the air duct to be mounted on the second mounting portion when open and that can further compress the air duct in a contracted state when closed, and an opening / closing mechanism that can open and close the pair of arm portions.

[0023] By providing a pair of openable and closable arms as described above, the air duct can be easily retracted to a state where it can be transported, thereby reducing the burden on the worker and further improving the ease of operation.

[0024] In addition, in the case where an opening / closing mechanism is provided, the opening / closing mechanism may include a pedal that can be depressed, a biasing member that pushes up the pedal against the force of depressing the pedal, and a link mechanism that connects the pedal and the pair of arm portions so that the pair of arm portions close when the pedal is depressed and open when the pedal is released.

[0025] According to the opening and closing mechanism configured as above, the worker can use his / her foot to perform the work of shrinking the air pipe, and then immediately use his / her hands to tie the shrinking air pipe with a string to make it transportable (bound state). In addition, after the binding work, the worker can remove his / her foot from the pedal to immediately remove the bound air pipe from the second placement section (air pipe cleaning device). As described above, according to this configuration, it is possible to significantly improve the workability of binding the air pipe after cleaning.

[0026] In addition, by providing a mechanism for opening and closing a pair of arms in the portion (second placement portion) on which the cleaned air ducts are placed as described above, a series of operations from cleaning, drying (spinning) to binding can be performed compactly on one device. Therefore, even in a limited space, it is possible to easily and smoothly clean and dry the air ducts and make them ready for transport. Effect of the Invention

[0027] As described above, the air duct cleaning device according to the present invention makes it possible to clean the entire air duct without any omissions, while improving the workability during cleaning as compared with the conventional method. [Brief description of the drawings]

[0028] [Figure 1] 1 is a perspective view showing an overall configuration of an air duct cleaning device according to an embodiment of the present invention; [Diagram 2]FIG. 2 is a front view of the air duct cleaning device shown in FIG. [Diagram 3] FIG. 2 is a plan view of the air duct cleaning device shown in FIG. [Figure 4] 3 is a cross-sectional view of a main part of the air duct cleaning device shown in FIG. 2. [Diagram 5] 3 is a front view of a main part of the air duct cleaning device shown in FIG. 2. [Figure 6] FIG. 2 is a front view of the air tube cleaning device showing a state in which an air tube before cleaning is placed on a first placement part, for explaining an example of an operation mode of the air tube cleaning device shown in FIG. 1. [Figure 7] FIG. 2 is a cross-sectional view of a main part of the air duct cleaning device in a state where the air duct is extended, for explaining an example of an operation mode of the air duct cleaning device shown in FIG. 1. [Figure 8] FIG. 2 is a front view of the main part of the air tube cleaning device showing a state in which a cleaned air tube is placed on a second placement part, illustrating an example of an operation mode of the air tube cleaning device shown in FIG. 1. [Figure 9] FIG. 2 is a front view of the main part of the air duct cleaning device for explaining an example of an operation mode of the air duct cleaning device shown in FIG. 1, showing a state in which the air duct after cleaning is compressed to a storable state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an air duct cleaning device according to an embodiment of the present invention will be described with reference to the drawings.

[0030] Fig. 1 shows a perspective view of an air duct cleaning device 10 according to this embodiment, and Fig. 2 shows a front view of the air duct cleaning device 10. As shown in Fig. 1, the air duct cleaning device 10 includes a first placement section 11, a second placement section 12, a cleaning liquid spray section 13, a gas spray section 14, and an oblique guide section 15. In this embodiment, the air duct cleaning device 10 further includes an annular member 16, a pair of arm sections 17, 17, an opening / closing mechanism 18, and a cart section 19. Each element will be described in detail below.

[0031] The first placement section 11 is capable of placing the air duct 1 in a contracted state before cleaning, and has a first placement stand 20 with which one end 1a of the air duct 1 can abut. Here, the shape of the first placement stand 20 is not particularly limited and may take any form. The first placement stand 20 is disposed within a range where it can be guided while being pulled out obliquely upward by the oblique guide section 15 described later.

[0032] The second mounting portion 12 allows the cleaned air duct 1 to be placed in a contracted state, and has a second mounting base 21 that can be brought into contact with the other end 1b of the air duct 1. The shape of the second mounting base 21 is not particularly important and may take any form. The second mounting base 21 is disposed within a range where the other end 1b (the end on the front side in the guide direction) of the air duct 1 that has passed through the oblique guide portion 15 described below can be placed.

[0033] 2, the oblique guide portion 15 is capable of guiding the air duct 1 obliquely upward while stretching it in a state in which the air duct 1 is placed on the first placement portion 11, and is disposed between the first placement portion 11 and the second placement portion 12. In addition, in terms of the relationship between the cleaning liquid jetting portion 13 and the gas jetting portion 14, the cleaning liquid jetting portion 13 is disposed so as to be capable of jetting cleaning liquid into the air duct 1 in a state in which the air duct 1 is guided obliquely upward by the oblique guide portion 15. In addition, the gas jetting portion 14 is disposed so as to be capable of jetting gas into the air duct 1 forward in the guide direction from the areas A1, A2 into which the cleaning liquid is jetted (see FIG. 7 described later).

[0034] In this embodiment, the diagonal guide portion 15 integrally includes a pair of guide bars 22, 22 extending parallel to each other and diagonally upward, a pair of first curved portions 23, 23 located on the rear side in the guide direction of the pair of guide bars 22, 22 (left side in Figure 2), and a pair of second curved portions 24, 24 located on the front side in the guide direction of the pair of guide bars 22, 22 (right side in Figure 2).

[0035] The position and attitude (angle) of each guide bar 22 is maintained at a predetermined size (see Figs. 4 and 7) so that the air duct 1 guided by the guide bars 22 passes through both the areas A1, A2 to be sprayed with the cleaning liquid and the areas B1, B2 to be sprayed with the gas, and the longitudinal dimension of each guide bar 22 is set to a predetermined size. Also, since the position for supporting the lower part of the air duct 1 varies depending on the distance between the pair of guide bars 22, 22, the above distance is set according to the outer diameter of the air duct 1 and in consideration of the height position to be supported, etc.

[0036] The angle of each guide bar 22 with respect to the horizontal direction can be any angle as long as it can guide the air duct 1 diagonally. However, since it is difficult to fully utilize the guiding function of the diagonal guide section 15 if the angle is too close to the vertical upward, the angle is set to, for example, greater than 10° and less than 45°, and preferably greater than 10° and less than 30°.

[0037] The pair of first curved portions 23, 23 are curved obliquely upward from below and smoothly connected to the pair of guide bars 22, 22 at their rear ends in the guide direction (see FIG. 2). This allows the air duct 1 extended upward from the first placement portion 11 to be smoothly introduced onto the pair of guide bars 22, 22.

[0038] The pair of second curved portions 24, 24 are curved obliquely from above toward below, and are smoothly connected to the pair of guide bars 22, 22 at their front ends in the guide direction (see FIG. 2). This allows the air duct 1 that has passed through the oblique guide portion 15 to be smoothly introduced onto the second placement portion 12.

[0039] In this embodiment, the diagonal guide portion 15 having the above-mentioned configuration is attached to an annular member 16. The annular member 16 is erected on a carriage portion 19. It is preferable that the direction of the central axis of the annular member 16 and the guide direction of the diagonal guide portion 15 are as close as possible to each other.

[0040] The cleaning liquid jetting unit 13 has a cleaning liquid supply source (not shown), a connection port 25 to which a pipe for the cleaning liquid supplied from the supply source is connected, an inner surface cleaning liquid jetting unit 26 capable of jetting the cleaning liquid onto the inner surface 1c of the air duct 1, and an outer surface cleaning liquid jetting unit 27 capable of jetting the cleaning liquid onto the outer surface 1d of the air duct 1 (see FIG. 4). As the cleaning liquid supply source, a high-pressure washer capable of supplying cleaning water as the cleaning liquid at high pressure can be used.

[0041] In this embodiment, the cleaning liquid jetting unit 13 further includes a cleaning liquid supply pipe 28 that connects the connection port 25 and the inner surface cleaning liquid jetting unit 26 .

[0042] Here, the cleaning liquid supply pipe 28 extends upward from the center of the first mounting table 20 of the first mounting portion 11, and then curves and extends obliquely upward, as shown in Fig. 2, for example. In this case, the inner surface cleaning liquid jetting unit 26 is provided on the tip side of the cleaning liquid supply pipe 28. In this case, the cleaning liquid supply pipe 28 and the pair of guide bars 22, 22 overlap in the guide direction. In other words, the guide direction dimension of the cleaning liquid supply pipe 28 is set so that the inner surface cleaning liquid supply unit 28 is located above the pair of guide bars 22, 22.

[0043] The inner surface cleaning liquid spraying unit 26 may have any configuration as long as it can spray cleaning liquid toward the inner surface 1c of the air duct 1. One example is an axially rotating nozzle that can rotate on its axis due to the pressure of high-pressure cleaning liquid to spray cleaning liquid around it.

[0044] The cleaning liquid supply pipe 28 constructed as above is rotatable around a vertical axis (see FIG. 3). This allows the tip of the cleaning liquid supply pipe 28 to be oriented in a direction different from the oblique guide portion 15, and allows the contracted air pipe 1 to be smoothly introduced onto the first mounting table 20 through the cleaning liquid supply pipe 28. The bearing that rotatably supports the cleaning liquid supply pipe 28 is preferably made of a resin having excellent water resistance.

[0045] 1 and 4, the external cleaning liquid spraying section 27 has a plurality of spray nozzles 29. All of these multiple spray nozzles 29 branch off from an arc-shaped pipe 30 attached to the inner surface of the annular member 16, and are directed toward the inside of the annular member 16. The arc-shaped pipe 30 is connected to a connection port 25 provided in the annular member 16 so that the cleaning liquid can flow therethrough (not shown), thereby making it possible to spray the cleaning liquid onto the outer surface 1d of the air duct 1 that has passed inside the annular member 16.

[0046] A known nozzle can be used as the spray nozzle 29, and for example, a spray nozzle capable of spraying the cleaning liquid in a fan shape can be suitably used. A nozzle similar to the spray nozzle 29 can be used as the spray nozzle 36 described later.

[0047] In addition, when constructing the cleaning liquid spraying section 13 as described above, an openable and closable cover member 31 is provided at a predetermined circumferential position of the annular member 16 so that the tip side of the cleaning liquid supply pipe 28 can be introduced into the inside of the annular member 16 by axial rotation.

[0048] The gas injection unit 14 has a gas supply source (not shown), a connection port 32 to which a pipe for gas supplied from the supply source is connected, an inner surface gas injection unit 33 capable of injecting gas onto the inner surface 1c of the air duct 1, and an outer surface gas injection unit 34 capable of injecting gas onto the outer surface 1d of the air duct 1 (see FIG. 4). As the gas supply source, a compressor capable of compressing and supplying air can be used.

[0049] In this embodiment, the gas jetting unit 14 further includes a gas supply pipe 35 that connects the connection port 32 and the inner surface gas jetting unit 33 .

[0050] Here, the gas supply pipe 35 has a shape that extends upward from the center of the second mounting table 21 of the second mounting portion 12, curves, and extends obliquely downward, for example, as shown in Fig. 2. In this case, the inner surface gas jetting portion 33 is provided on the tip side of the gas supply pipe 35. In this case, the gas supply pipe 35 and the pair of guide bars 22, 22 overlap in the guide direction. In other words, the guide direction dimension of the gas supply pipe 35 is set so that the inner surface gas jetting portion 33 is located above the pair of guide bars 22, 22.

[0051] The inner surface gas injection unit 33 may have any configuration as long as it can inject gas toward the inner surface 1c of the air duct 1. One example is a configuration in which air nozzles capable of increasing and accelerating the amount of air by drawing in the surrounding air are radially arranged in multiple directions (see FIG. 2, etc.).

[0052] The gas supply pipe 35 having the above-mentioned configuration is configured to be rotatable around a vertical axis (see FIG. 3). This allows the tip of the gas supply pipe 35 to be oriented in a direction different from that of the oblique guide portion 15, and the air pipe 1 in a contracted state (bound state) to be smoothly removed from the first mounting table 20 through the gas supply pipe 35.

[0053] 1 and 4, the external gas injection section 34 has a plurality of injection nozzles 36. All of these injection nozzles 36 branch off from an arc-shaped pipe 37 attached to the inner surface of the annular member 16, and are directed toward the inside of the annular member 16. The arc-shaped pipe 37 is connected to a connection port 32 provided in the annular member 16 so as to allow the cleaning liquid to flow therethrough (not shown), thereby making it possible to inject gas onto the outer surface 1d of the air duct 1 that has passed inside the annular member 16.

[0054] As the injection nozzle 36, a known nozzle can be used, and for example, an injection nozzle capable of injecting gas in a fan shape can be suitably used.

[0055] The pair of arms 17, 17 extend upward and bend toward each other as shown in FIG. 5. The pair of arms 17, 17 are configured to be openable and closable by an opening / closing mechanism 18. Specifically, the pair of arms 17, 17 are configured to be tiltable in directions away from each other while rising together by the opening / closing mechanism. This allows the pair of arms 17, 17 to retreat from above the second mounting table 21, thereby making it possible to introduce the cleaned air duct 1 onto the second mounting table 21 from above. In addition, the pair of arms 17, 17 are configured to be tiltable in directions approaching each other while descending together by the opening / closing mechanism 18. This allows the pair of arms 17, 17 to be configured to further compress the air duct 1 placed on the second mounting table 21 in a contracted state (see FIG. 5 for both).

[0056] In this embodiment, the opening / closing mechanism 18 includes a pedal 38 that can be depressed, a biasing member 39 such as a gas spring that pushes up the pedal 38 against the force of depressing the pedal 38, and a link mechanism 40 that connects the pedal 38 and the pair of arm portions 17, 17 so that the pair of arm portions 17, 17 close when the pedal 38 is depressed and open when the pedal 38 is released.

[0057] In addition, in this embodiment, the opening / closing mechanism 18 is configured so that the link mechanism 40 and thus the pair of arm portions 17, 17 are locked by sliding the pedal 38 horizontally or slightly diagonally upward from the depressed state.

[0058] Next, an example of an operation mode of the air duct cleaning device 10 having the above configuration will be described mainly with reference to FIGS.

[0059] First, as shown in Fig. 6, the cleaning liquid supply pipe 28 extending upward from the first mounting portion 11 is picked up by hand and rotated by a predetermined phase (for example, 180°) around the vertical axis. Then, the uncleaned air duct 1 is introduced onto the first mounting table 20 so as to be inserted into the cleaning liquid supply pipe 28.

[0060] After placing the air duct 1 on the first mounting table 20, the cleaning liquid supply pipe 28 is rotated again around its axis with the cover member 31 of the annular member 16 open, and the inner surface cleaning liquid spraying part 26, which is the tip of the cleaning liquid supply pipe 28, is disposed inside the annular member 16. Thereafter, the other end 1b of the contracted air duct 1 (see FIG. 6) is grasped and the air duct 1 is stretched while being guided obliquely upward by the oblique guide part 15, and the other end 1b of the air duct 1 is introduced into the inner space of the annular member 16, which becomes the areas to be cleaned A1, A2 (see FIG. 7).

[0061] Furthermore, before the air duct 1 is introduced into the inner space of the annular member 16, the valve of the connection port 25 for the cleaning liquid is opened to supply the cleaning liquid, such as high-pressure water, from a cleaning liquid supply source, such as a high-pressure washer, connected to the connection port 25 to the cleaning liquid jetting section 13 (inner surface cleaning liquid jetting section 26, outer surface cleaning liquid jetting section 27). As a result, the cleaning liquid is supplied from the connection port 25 through the cleaning liquid supply pipe 28 to the inner surface cleaning liquid jetting section 26, and also through the arc-shaped piping 30 to a plurality of jet nozzles 29 as the outer surface cleaning liquid jetting section 27. As a result, a sprayed area A1 of the cleaning liquid is formed around the inner surface cleaning liquid jetting section 26, and a sprayed area A2 of the cleaning liquid is formed inside the outer surface cleaning liquid jetting section 27 (see FIG. 7).

[0062] Similarly, the valve of the gas connection port 32 is opened, and gas such as high-pressure air is supplied to the gas jetting unit 14 from a gas supply source such as a compressor connected to the connection port 32. As a result, the gas is supplied from the connection port 32 through the gas supply pipe 35 to the inner surface gas jetting unit 33, and is also supplied to the multiple jet nozzles 36 serving as the outer surface gas jetting unit 34 through the arc-shaped piping 37. As a result, a gas jetted area B1 is formed around the inner surface gas jetting unit 33, and a gas jetted area B2 is formed inside the outer surface gas jetting unit 34.

[0063] At this time, the regions B1 and B2 to which the gas is sprayed are formed forward in the guide direction of the air duct 1 relative to the regions A1 and A2 to which the cleaning liquid is sprayed. Therefore, as shown in Fig. 7, by passing the air duct 1 through the inside of the annular member 16 while stretching it, the inner surface 1c and the outer surface 1d of the air duct 1 are cleaned in order from the tip end (other end 1b) of the air duct 1, and then the cleaning liquid adhering to the inner surface 1c and the outer surface 1d is blown away by the spray of gas, thereby dehydrating the air duct 1.

[0064] After the air duct 1 is cleaned and dehydrated as described above, the other end of the air duct 1 is 1b is placed in a contracted state on the second placement table 21 (see FIG. 8). At this time, since the pair of arms 17, 17 are in an open state, the air duct 1 can be placed without interfering with the arms 17.

[0065] After the cleaned air duct 1 is placed on the second placement table 21 in this way, the pedal 38 is depressed to push down the pair of arm parts 17, 17 while closing them. This causes the air duct 1 placed in a contracted state to be further compressed (see FIG. 9). At this point, the pedal 38 is slid to lock the pair of arm parts 17, 17 in a pressed-down state. As a result, the air duct 1 is held in a contracted state, and the worker moves to the next task, which is the binding task, with his / her foot removed from the pedal 38. Then, when the binding task of the air duct 1 is completed, the pedal 38 is slid back to its original position to release the locked state of the pair of arm parts 17, 17. Furthermore, by reducing the force of depressing the pedal 38 or by removing the foot from the pedal 38, the pair of arm parts 17, 17 are pushed up while opening due to the biasing force from the biasing member 39. This causes the upper part of the air duct 1 to be in an open state. Here, the gas supply pipe 28 extending upward from the second mounting table 21 is rotated about the vertical axis to shift the tip of the gas supply pipe 35 from the oblique guide part 15, thereby making it possible to easily remove the bound air pipe 1. In this manner, the air pipe 1 is cleaned, dried (dehydrated), and subjected to the work (binding) to prepare it for transport.

[0066] As described above, in the air duct cleaning device 10 according to the present embodiment, the oblique guide portion 15 is provided to guide the air duct 1 obliquely upward while stretching the air duct 1 in the placed state, so that the air duct 1 can be stretched while being supported by the oblique guide portion 15. Therefore, the air duct 1 can be stretched smoothly with less burden on the operator compared to the conventional case of stretching it vertically upward. In addition, since the cleaning liquid and gas can be sprayed to the air duct 1 guided obliquely upward by the oblique guide portion 15, the cleaning liquid and gas can be sprayed to the end (other end 1b) of the air duct 1 located at the most forward side in the guide direction (see FIG. 7). Therefore, even when cleaning is performed while stretching the air duct 1 from a contracted state, it is possible to clean the entire air duct 1 without leakage and remove the cleaning liquid to achieve early drying. As described above, according to the air duct cleaning device 10 according to the present embodiment, it is possible to improve the workability during cleaning while cleaning the entire air duct 1 without leakage.

[0067] In addition, in the air duct cleaning device 10 according to this embodiment, the equipment for cleaning (cleaning liquid spray unit 13), the equipment for dehydration (drying) (gas spray unit 14), and the equipment for making the air duct 1 transportable (bound state) (a pair of arm units 17, 17 and a lockable opening / closing mechanism 18) are mounted on one device (cart unit 19), so that a series of operations for cleaning, drying, and binding the air duct 1 can be performed compactly on the cart unit 19. Therefore, even in a limited space, the air duct 1 can be easily and smoothly cleaned, dried, and made transportable.

[0068] Although one embodiment of the present invention has been described above, the air duct cleaning device according to the present invention is not limited to the above-mentioned exemplary configuration, and various modifications are possible within the scope of the present invention.

[0069] For example, in the above embodiment, a pair of guide bars 22, 22 is provided as the oblique guide portion 15, but of course other configurations may be adopted. That is, as long as the worker can grasp the other end 1b of the air duct 1 and stretch it obliquely upward, the oblique guide portion 15 may have any configuration, and for example, although not shown, it may have a configuration that can guide the air duct 1 obliquely upward while supporting the lower portion thereof in surface contact.

[0070] In the above embodiment, the configuration is exemplified in which the cleaned air duct 1 can be further compressed from the contracted state by opening and closing the pair of arms 17, 17, but the present invention is not limited to this. For example, although not shown in the drawings, the contracted air duct 1 may be further compressed by applying a mechanism that can move downward while contracting by the operator.

[0071] In the above embodiment, the cleaning liquid supply pipe 28 is erected from the center of the first mounting table 20 and configured to pass through the center of the air pipe 1, but other configurations are possible. For example, although not shown, the curved portion of the cleaning liquid supply pipe 28 or the upper portion of the portion extending obliquely upward may be shaped so as to abut against the inner surface 1c of the air pipe 1 and guide the air pipe 1 obliquely upward. In this way, the air pipe 1 can be introduced into the oblique guide portion 15 more smoothly, and the workability of the stretching can be further improved. [Explanation of symbols]

[0072] 1 windpipe 1a One end 1b Other end 1c Inner surface 1d external surface 10 Wind pipe cleaning device 11 First loading section 12 Second loading section 13 Cleaning fluid injection unit 14 Gas injection section 15 Diagonal guide section 16 Annular member 17,17 Pair of arms 18 Opening and closing mechanism 19 Truck section 20 First mounting table 21 Second mounting table 22, 22 Pair of guide bars 23,23 A pair of first curved portions 24,24 A pair of second curved portions 25 Connection port (cleaning fluid) 26 Inner surface cleaning fluid spray unit 27 External cleaning fluid spray unit 28 Cleaning solution supply pipe 29 Spray nozzle (cleaning fluid) 30 Arc-shaped piping 31 Cover member 32 Connection port (gas) 33 Gas jet for inner surface 34 External gas jet unit 35 Gas supply pipe 36 Injection nozzle (gas) 37 Arc-shaped piping 38 Pedals 39 Pressurizing member 40 Link mechanism

Claims

1. 1. A device for cleaning a telescopic air duct, comprising: A first placement portion on which the air pipe in a contracted state can be placed; a cleaning liquid spraying unit capable of spraying cleaning liquid into the air duct; a gas injection unit capable of injecting gas into the air duct, The air pipe may further include an oblique guide portion that can guide the air pipe obliquely upward while stretching the air pipe placed on the first placement portion, an air duct cleaning device, characterized in that the cleaning liquid injection unit is arranged so as to be able to inject the cleaning liquid into the air duct while it is guided diagonally upward by the oblique guide unit, and the gas injection unit is arranged so as to be able to inject the gas into the air duct forward in the guide direction of the area where the cleaning liquid is injected.

2. 2. The air duct cleaning device according to claim 1, wherein the oblique guide portion includes a pair of guide bars extending parallel to each other and obliquely upward and capable of supporting a lower portion of the air duct.

3. 3. The air duct cleaning device according to claim 2, wherein the oblique guide portion further includes a pair of first curved portions that are located on the rear side of the pair of guide bars in the guide direction, curve diagonally upward from below, and connect to the pair of guide bars.

4. 2. The air duct cleaning device according to claim 1, wherein the cleaning liquid spraying section includes: the cleaning liquid supply pipe extending upward from the first placement section and then curving to extend diagonally upward; and an inner surface cleaning liquid spraying section provided at a tip side of the cleaning liquid supply pipe and capable of spraying the cleaning liquid onto an inner surface of the air duct.

5. 5. The air duct cleaning device according to claim 4, wherein the cleaning liquid supply pipe is rotatable about a vertical axis.

6. a second placement portion on which the air duct that has been cleaned by the cleaning liquid spraying portion can be placed in a contracted state, 2. The air duct cleaning device according to claim 1, wherein the gas injection section comprises a gas supply pipe that extends upward from the second placement section and then curves and extends diagonally downward, and an inner surface gas injection section that is provided at the tip side of the gas supply pipe and is capable of injecting gas onto the inner surface of the air duct.

7. The oblique guide portion further includes an annular member disposed around the oblique guide portion. The air duct cleaning device according to claim 4 , wherein the cleaning liquid spraying section further includes an outer surface cleaning liquid spraying section that is provided on an inner surface of the annular member and is capable of spraying the cleaning liquid toward an outer surface of the air duct.

8. The oblique guide portion further includes an annular member disposed around the oblique guide portion. The air duct cleaning device according to claim 6 , wherein the gas jetting section further includes an outer surface gas jetting section that is provided on an inner surface of the annular member and is capable of jetting the gas toward an outer surface of the air duct.

9. 7. The air duct cleaning device according to claim 6, further comprising a pair of arms that, when open, enable the air duct to be placed on the second placement section and, when closed, further compress the air duct in the contracted state, and an opening / closing mechanism that opens and closes the pair of arms.

10. 10. The air duct cleaning device according to claim 9, wherein the opening / closing mechanism includes a pedal that can be depressed, a biasing member that pushes up the pedal against a force that presses down on the pedal, and a link mechanism that connects the pedal and the pair of arm portions so that the pair of arm portions close when the pedal is depressed and open when the depression of the pedal is released.

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