KR102917818B1 - Apparutus for recovering and supplying short ball of rehabilitating superannuated pipes - Google Patents

Abstract

The present invention relates to a short ball recovery and supply device for pipeline rehabilitation, which supplies and recovers a short ball (B) to a blasting device (200) while traveling in a pipeline (P) in which an air supply unit (I) for supplying air is installed at the front and an exhaust port (O) for exhausting air is installed at the rear, thereby maintaining an air flow of a predetermined velocity (V) in one direction, and the device comprises: a tank (10) which travels in the pipeline (P), has a front side wall (11) and a rear side wall (12) formed at the front and rear sides, has an inlet (13) formed at the upper side through which a short ball (B) is introduced, and has a discharge port (14) formed at the lower side; a short ball collection unit (20) located at the front side of the blasting device (200) for collecting a short ball (B) that has fallen on the bottom of the pipeline (P); It is characterized by including a recovery box (30) for recovering a short ball (B) into a tank (10) through a front side wall (11); a main supply line (50) connected to the tank (10) and supplying high-pressure air; a first sub-supply line (60) branched from the main supply line (50) and connected to a short ball collection unit (20) and supplying high-pressure air to the short ball collection unit (20); a transfer line (90) connecting the short ball collection unit (20) and the recovery box (30) to transfer the short ball (B) collected in the short ball collection unit (20) to the recovery box (30); a main valve (55) installed in the main supply line (50) to open and close a flow path of the main supply line; and a sub-valve (65) installed in the first sub-supply line (60) to open and close a flow path of the sub-supply line.

Description

Apparatus for recovering and supplying short ball of rehabilitating superannuated pipes

The present invention relates to a short ball recovery and supply device for pipeline rehabilitation, and more particularly, to a short ball recovery and supply device for pipeline rehabilitation that can easily perform the function of recovering a short ball used to remove an old coating from a pipeline and supplying it to a blasting device.

Large pipelines, such as water pipes, are typically constructed of cast iron or steel. A coating forms on the inner surface of these pipes to protect them from corrosion by flowing fluids. However, over time, after being buried in these pipes, temperature and pressure changes can cause the internal coating to peel off. Once this peeling has progressed, resistance to fluid flow further accelerates the peeling process, leading to corrosion due to oxidation. Furthermore, a layer of scale can form on the coating, deteriorating water quality.

To solve this problem, there is a method of replacing the entire pipeline, but since it takes a lot of construction time and causes great inconvenience to traffic while digging up the ground and refilling it, a method of rehabilitating the pipeline rather than replacing it has been proposed recently.

To this end, first, a supply device for supplying shot balls into the inside of the pipeline and a blasting device for spraying shot balls are introduced, and the introduced shot ball supply device and blasting device move along the pipeline and spray a large number of shot balls at high pressure onto the inner surface of the pipeline through the blasting device to strike and peel off the old coating, and after the old coating is peeled off, the shot balls that fall to the floor are recovered by the supply device and then supplied to the blasting device, thereby being reused for removing the old coating.

However, a large amount of dust is generated when the short ball sprayed with high-pressure air hits the old coating, and the short ball that falls to the bottom of the pipeline is mixed with dust. Therefore, in order to recover and recycle the short ball, a process of removing the dust contained in it was necessary, which ultimately increased the time required for the blasting process.

In addition, because it was very difficult for workers to remove dust from shot balls in a narrow pipeline environment, the dust was not sufficiently removed in reality, and as a result, when the recovered shot balls were sprayed, dust was sprayed together, which resulted in the problem of not being able to cleanly treat the surface of the pipeline.

The present invention was created to solve the above problems, and the purpose of the present invention is to provide a shot ball recovery and supply device for pipeline rehabilitation, which can increase the efficiency of pipeline rehabilitation treatment by easily performing the function of recovering shot balls used in the process of removing old coatings in pipelines and then supplying them to a blasting device.

Another object of the present invention is to provide a short ball recovery and supply device for pipeline rehabilitation, which can enable clean surface treatment of the inner surface of a pipeline by removing dust contained in the short ball.

In order to achieve the above purpose, a short ball recovery and supply device for pipeline rehabilitation according to the present invention is provided, wherein an air supply unit (I) for supplying air is installed at the front, and an exhaust port (O) for exhausting air is installed at the rear, and thus a short ball (B) is supplied to and recovered by a blasting device (200) while traveling in a pipeline (P) in which a predetermined air velocity (V) is maintained in one direction, and a tank (10) is provided that travels in the pipeline (P), and has a front side wall (11) and a rear side wall (12) formed at the front and rear sides, an inlet (13) formed at the upper side through which a short ball (B) is introduced, and a discharge port (14) formed at the lower side through which the short ball (B) is discharged; a short ball collection unit (20) located at the front side of the blasting device (200) for collecting a short ball (B) that has fallen on the bottom of the pipeline (P); It is characterized by comprising: a recovery box (30) for recovering a short ball (B) into the tank (10) through the front side wall (11); a main supply line (50) connected to the tank (10) and supplying high-pressure air; a first sub-supply line (60) branched from the main supply line (50) and connected to the short ball collection unit (20) and supplying high-pressure air to the short ball collection unit (20); a transfer line (90) connecting the short ball collection unit (20) and the recovery box (30) to transfer the short ball (B) collected in the short ball collection unit (20) to the recovery box (30); a main valve (55) installed in the main supply line (50) to open and close a flow path of the main supply line; and a sub-valve (65) installed in the first sub-supply line (60) to open and close a flow path of the sub-supply line.

In the present invention, the short ball collection unit (20) includes a hopper (21) into which short balls (B) are injected from the upper side and a hopper outlet (21a) is formed at the lower side, a sealed container (22) formed at the lower side of the hopper (21) into which short balls (B) discharged through the hopper outlet (21a) are introduced, an air supply nozzle (23) installed at the side of the sealed container (22) and connected to the first sub-supply line (60), and a short ball discharge nozzle (24) installed at the bottom of the sealed container (22) and connected to a transport line (90) for transporting the short balls (B).

In the present invention, the short ball collection unit (20) includes an opening/closing wing (25) that is hingedly connected to the lower side of the hopper outlet (21a) inside the sealed container (22) to selectively open/close the hopper outlet (21a), and a spring (not shown) that applies elastic force so that the opening/closing wing (25) closes the hopper outlet (21a) in a situation where no short ball (B) is fed into the hopper (21).

In the present invention, a second sub-supply line (70) branching from the first sub-supply line (60) and supplying high-pressure air to the recovery box (30) is further included.

In the present invention, the recovery box (30) includes a box body (31) connected to a side wall hole (11a) formed in the front side wall (11), a first box nozzle (32) installed in the box body (31) and fixed such that the outlet (71) of the second sub-supply line (70) faces the side wall hole (11a) from the inside of the box body (31), a second box nozzle (33) installed in the box body (31) and fixed such that the outlet of the transfer line (90) faces the side wall hole (11a), and a hopper end (34) installed inside the box body (31) and guiding a short ball (B) discharged from the transfer line (90) to the side wall hole (11a).

In the present invention, a dust discharge pipe (40) formed on the upper part of the tank (10) and connected to a discharge hose (H) extending beyond the blasting device (200); and a third sub-supply line (80) branched from the first sub-supply line (60) and built into the dust discharge pipe (40) to spray high-pressure air toward the discharge hose (H) are further included.

According to the present invention, the main supply line (50) connected to the tank (10) and supplying high-pressure air, the first sub-supply line (60) branched from the main supply line (50) and connected to the short ball collection unit (20), the transfer line (90) connecting the short ball collection unit (20) and the recovery box (30) to transfer the collected short balls (B) to the recovery box (30), the main valve (55) installed in the main supply line (50) to open and close the flow path, and the sub-valve (65) installed in the first sub-supply line (60) to open and close the flow path, thereby enabling the short balls used to remove the old coating from the furnace (P) to be easily recovered, and by easily supplying the recovered short balls to the blasting device (200), the pipeline rehabilitation work can be effectively performed in a relatively short time.

And by including a dust discharge pipe (40) connected to a discharge hose (H) extending beyond the blasting device (200) and a third sub-supply line (80) branching from the first sub-supply line (60) and built into the dust discharge pipe (40) to inject high-pressure air toward the discharge hose (H), the dust contained in the shot ball returned to the tank (10) can be removed, and accordingly, by using a clean shot ball to remove an old coating film, it is possible to cleanly treat the inner surface of the pipe.

Figure 1 is a drawing for explaining that a short ball recovery and supply device for pipeline rehabilitation according to the present invention is built into a pipeline.
Figure 2 is a drawing for explaining the overall configuration of the short ball recovery and supply device of Figure 1.
Figure 3 is a drawing for explaining the configuration of the short ball collection unit of Figure 2.
Figure 4 is a drawing for explaining that the opening/closing wing in the short ball collection section of Figure 4 opens the hopper outlet and the short balls are collected into a sealed container.
Figure 5 is a drawing for explaining that the short ball introduced into the sealed container by Figure 4 is supplied to the recovery box through the transfer line.
Fig. 6 is a drawing for explaining the configuration of the recovery box of Fig. 2.
Figure 7 is a drawing for explaining how a short ball is supplied to a blasting device in the short ball recovery and supply device of Figure 2.
FIG. 8 is a drawing for explaining how short balls collected from the short ball collection unit in the short ball recovery and supply device of FIG. 2 are recovered into a tank.

Hereinafter, a short ball recovery and supply device for pipeline rehabilitation according to the present invention will be described in detail with reference to the attached drawings.

In the following examples, singular expressions include plural expressions unless the context clearly indicates otherwise. In the following examples, terms such as "include" or "have" indicate the presence of a feature or component described in the specification, and do not preemptively exclude the possibility that one or more other features or components may be added. In the following examples, when a part such as a film, region, or component is said to be on or above another part, this includes not only cases where it is directly above the other part, but also cases where another film, region, component, etc. is interposed therebetween. In the drawings, the sizes of components may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to what is illustrated. If a certain embodiment can be implemented differently, a specific process order may be performed differently from the described order. For example, two processes described in succession may be performed substantially simultaneously, or may be performed in the reverse order of the described order.

FIG. 1 is a drawing for explaining that a short ball recovery and supply device for pipeline rehabilitation according to the present invention is built into a pipeline, and FIG. 2 is a drawing for explaining the overall configuration of the short ball recovery and supply device of FIG. 1.

As illustrated, the short ball recovery and supply device (100) for pipeline rehabilitation according to the present invention supplies and recovers a short ball (B) to a blasting device (200) while moving through a pipeline (P) in which an air supply part (I) for supplying air is installed at the front and an exhaust port (O) for exhausting air is installed at the rear, thereby maintaining a predetermined air flow rate (V) in one direction.

This short ball recovery and supply device (100) is configured to run within a pipe (P), and includes a tank (10) having front side walls (11) and rear side walls (12) formed at the front and rear sides, an inlet (13) formed at the top for introducing a short ball (B) and a discharge port (14) formed at the bottom for discharging a short ball (B); a short ball collection unit (20) positioned at the front side of a blasting device (200) for collecting a short ball (B) that has fallen to the bottom of the pipe (P); a recovery box (30) for recovering a short ball into the tank (10) through the front side wall (11); a dust discharge pipe (40) formed at the top of the tank (10) and connected to a discharge hose (H) that extends beyond the blasting device (200); a main supply line (50) connected to the tank (10) for supplying high-pressure air; A first sub-supply line (60) branched from the main supply line (50) and connected to the short ball collection unit (20) to supply high-pressure air to the short ball collection unit (20); a second sub-supply line (70) branched from the first sub-supply line (60) to supply high-pressure air to the recovery box (30); a third sub-supply line (80) branched from the first sub-supply line (60) and installed in the dust discharge pipe (40) to spray high-pressure air toward the discharge hose (H); a transfer line (90) connecting the short ball collection unit (20) and the recovery box (30) to transfer short balls (B) collected in the short ball collection unit (20) to the recovery box (30); a main valve (55) installed in the main supply line (50) to open and close the flow path of the main supply line; It is characterized by including a sub-valve (65) installed in the first sub-supply line (60) and opening and closing the flow path of the sub-supply line.

The inside of the tank (10) is filled with a metal shot ball (B) having a diameter of less than 1 mm. The shot ball (B) is supplied to a known blasting device (200) through an outlet (14) together with applied high-pressure air, and is then sprayed at high speed from the blasting device (200) to remove an old coating film inside the pipe (P). High-pressure air capable of spraying the shot ball (B) is continuously supplied to the tank (10), and the tank has sufficient durability to withstand such air pressure.

A dust discharge pipe (40) is formed at the top of the tank (10) and is connected to a discharge hose (H) that extends beyond the blasting device (200). The dust discharge pipe (40) discharges dust contained in the shot ball recovered into the tank (10) through the discharge hose (H).

The main supply line (50) is connected to an external compressor (not shown) and supplies high-pressure air for the purpose of transporting shot balls to a blasting device (200), returning shot balls used for removing old paint films to a tank (10), and removing dust contained in the shot balls.

A main valve (55) is installed in the main supply line (55), and a sub-valve (65) is installed in the first sub-supply line (60). When the sub-valve (65) is closed and the main valve (55) is opened, the high-pressure air is completely supplied directly to the tank (10), and when the main valve (55) is closed and the sub-valve (65) is opened, the high-pressure air is completely supplied to the first sub-supply line (60). That is, by employing the main valve (55) and the sub-valve (65), high-pressure air can be selectively supplied to the tank (10) or the first sub-supply line (60).

The outlet (71) of the second sub-supply line (70) is built into the recovery box (30) and is fixed facing the side wall hole (11a) described later.

The outlet of the third sub-supply line (80) is built into the dust discharge pipe (40) and faces the discharge hose (H). Accordingly, when high-pressure air is sprayed into the third sub-supply line (80), a vacuum is formed in the dust discharge pipe (40), so that the dust inside the tank (10) is sucked toward the dust discharge pipe (40) and then discharged through the discharge hose (H) by the high-pressure air.

The transfer line (90) transfers the short balls (B) collected from the short ball collection unit (20) to the recovery box (30).

Meanwhile, a first connector (66) is installed in the first sub-supply line (60) so that it can be connected to or separated from the short ball collection unit (20), and a second connector (96) is installed in the transfer line (90) so that it can be connected to or separated from the short ball collection unit (20). Accordingly, the first sub-supply line (60) and the transfer line (90) can be connected to or separated from the short ball collection unit (20) as needed.

FIG. 3 is a drawing for explaining the configuration of the short ball collection unit of FIG. 2 by extracting the drawing, FIG. 4 is a drawing for explaining that the short balls are collected into a sealed container by opening the hopper outlet of the short ball collection unit of FIG. 4, and FIG. 5 is a drawing for explaining that the short balls introduced into the sealed container by FIG. 4 are supplied to the recovery box through a transfer line.

The short ball collection unit (20) comprises a hopper (21) into which short balls (B) are injected from the upper side and a hopper outlet (21a) is formed at the lower side, a sealed container (22) formed at the lower part of the hopper (21) into which short balls (B) discharged through the hopper outlet (21a) are introduced, an air supply nozzle (23) installed on the side of the sealed container (22) and connected to the first sub-supply line (60), a short ball discharge nozzle (24) installed on the bottom of the sealed container (22) and connected to the transport line (90) for transporting short balls (B), an opening/closing wing (25) that is hinge-connected to one side of the lower end of the hopper outlet (21a) inside the sealed container (22) and selectively opens/closes the hopper outlet (21a), and an opening/closing wing (25) that selectively opens/closes the hopper outlet (21a) in a situation where short balls (B) are not injected into the hopper (21). It includes a spring (not shown) that applies elastic force to close the hopper outlet (21a).

In the sealed container (22), the short ball (B) that is fed into the hopper (21) and then flows in through the hopper outlet (21a) is collected.
As mentioned in the background technology of the invention, the shot balls are supplied to the blasting device (200) and then sprayed onto the inner surface of the pipeline to strike and peel off the old coating, and then fall to the bottom of the pipeline. In order to reuse these fallen shot balls, they are collected through a shot ball collection unit (20). For example, the collection is performed by a worker manually throwing the shot balls that fell to the bottom of the pipeline into a hopper (21), or by using a broom to collect the shot balls in a dustpan and then throwing the collected shot balls in the dustpan into the hopper (21). In other words, the shot balls can be collected in the hopper (21) in various ways.

The air supply nozzle (23) supplies high-pressure air into the sealed container (22) by connecting the first sub-supply line (60) to the side of the sealed container (22). At this time, the air supply nozzle (23) detachably connects the first sub-supply line (60), and thus, the first sub-supply line (60) can be connected to or disconnected from the air supply nozzle (23) as needed.

The short ball discharge nozzle (24) connects the transfer line (90) to the bottom of the sealed container (22), thereby allowing the collected short balls (B) to flow into the transfer line (90) connected to the recovery box (30). At this time, the short ball discharge nozzle (24) detachably connects the transfer line (90), and thus, the transfer line (90) can be connected to or separated from the short ball discharge nozzle (24) as needed.

The opening/closing wing (25) is elastically biased by a spring to keep the hopper outlet (21a) normally closed, and when a short ball (B) is fed into the hopper (21), the hopper outlet (21a) is opened by the weight of the short ball (B).

By this structure, when the short ball (B) is returned to the sealed container (22), and high pressure air is introduced into the sealed container (22) through the first sub-supply line (S1), the high pressure air pushes the opening/closing blade (25) to close the entrance of the hopper (21), and then the short ball (B) is discharged through the short ball discharge nozzle (24).

Figure 6 is a drawing for explaining the configuration of the recovery box of Figure 2.

The recovery box (30) includes a box body (31) connected to a side wall hole (11a) formed in a front side wall (11), a first box nozzle (32) installed in the box body (31) and fixed so that the outlet (71) of the second sub-supply line (70) faces the side wall hole (11a) from the inside of the box body (31), a second box nozzle (33) installed in the box body (31) and fixed so that the outlet of the transfer line (90) faces the side wall hole (11a), and a hopper end (34) installed inside the box body (31) and guiding a short ball (B) discharged from the transfer line (90) to the side wall hole (11a).

By this structure, the high-pressure air supplied through the second sub-supply line outlet (71) is sprayed toward the side wall hole (11a) to form a vacuum inside the box body (31), and accordingly, the short ball (B) supplied through the transfer line (90) is introduced into the box body (31) by the vacuum and then recovered into the tank (10) through the side wall hole (11a).

FIG. 7 is a drawing for explaining how short balls are supplied to a blasting device in the short ball recovery and supply device of FIG. 2, and FIG. 8 is a drawing for explaining how short balls collected from a short ball collection unit in the short ball recovery and supply device of FIG. 2 are recovered to a tank.

(a) When supplying the shot balls (B) filled in the tank (10) to the blasting device (200), the main valve (55) is opened and the sub-valve (65) is closed. Then, as shown in Fig. 7, the high-pressure air supplied through the main supply line (50) is completely introduced into the tank (10) and then supplied to the blasting device (200) through the transfer pipe (C) connected to the discharge port (14), and then the blasting device (200) sprays a number of shot balls at high pressure onto the inner surface of the pipe (P) to strike and peel off the old coating.

(b) When removing dust contained in the shot ball (B) that has fallen into the pipe (P) after the old film removal work and is to be recovered into the tank (10), the worker collects the fallen shot ball (B) and puts it into the shot ball collection unit (20), closes the main valve (55), and opens the sub valve (65). Then, as shown in Fig. 8, the high-pressure air supplied through the first sub-supply line (60) is supplied into the sealed container (22) of the shot ball collection unit (20), and accordingly, the collected shot ball (B) that has been fed into the hopper (21) by the worker is transferred to the recovery box (30) through the transfer line (90).
Meanwhile, the high-pressure air supplied through the second sub-supply line (70) is supplied to the recovery box (30) and then sprayed toward the side wall hole (11a), thereby forming a vacuum pressure inside the box body (31) so that the short ball (B) transported through the transfer line (90) flows into the box body (31), and the high-pressure air supplied through the third sub-supply line (80) is sprayed from the inside of the dust discharge pipe (40) toward the discharge hose (H), thereby forming a vacuum pressure inside the dust discharge pipe (40) so that the dust generated from the short ball recovered into the tank (10) is discharged through the discharge hose (H).

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Through this complex process, the shot balls collected by the shot ball collection unit (20) are not only automatically transferred to the tank (10), but also the dust scattered during the tank (10) filling process is discharged beyond the front side of the blasting device (200) through the discharge line (H). By doing so, the shot balls collected by the tank (10) can be in a clean state with the dust removed.

For reference, as air flows at a predetermined velocity (V) toward the exhaust port (O) within the pipe (P), dust discharged through the exhaust line (H) is discharged toward the exhaust port (O).

In this way, according to the present invention, the main supply line (50) connected to the tank (10) and supplying high-pressure air, the first sub-supply line (60) branched from the main supply line (50) and connected to the short ball collection unit (20), the transfer line (90) connecting the short ball collection unit (20) and the recovery box (30) to transfer the collected short balls (B) to the recovery box (30), the main valve (55) installed in the main supply line (50) to open and close the flow path, and the sub-valve (65) installed in the first sub-supply line (60) to open and close the flow path are included, so that the short balls used to remove the old coating in the furnace (P) can be easily recovered, and the recovered short balls can be easily supplied to the blasting device (200), so that the pipeline rehabilitation work can be effectively performed in a relatively short time.

And by including a dust discharge pipe (40) connected to a discharge hose (H) extending beyond the blasting device (200) and a third sub-supply line (80) branching from the first sub-supply line (60) and built into the dust discharge pipe (40) to inject high-pressure air toward the discharge hose (H), the dust contained in the shot ball returned to the tank (10) can be removed, and accordingly, by using a clean shot ball to remove an old coating film, it is possible to cleanly treat the inner surface of the pipe.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

100 ... Short ball recovery and supply device
10... Tank 11... Front side wall
11a ... side wall hole 12 ... rear side wall
13 ... inlet 14 ... outlet
20... short ball catcher 21... hopper
21a ... Hopper outlet 22 ... Sealed container
23 ... Air supply nozzle 24 ... Short ball discharge nozzle
25... Opening and closing wings 30... Recovery box
31 ... Box body 32 ... First box nozzle
33... Second box nozzle 34... Hopper unit
40 ... dust exhaust pipe 50 ... main supply line
55... Main valve 60... First sub-supply line
65... Sub-valve 66... First connector
70...2nd sub-supply line 80...3rd sub-supply line
90... transfer line 96... second connector
200 ... blasting device

Claims (6)

As an air supply unit (I) for supplying air is installed in the front, and an exhaust port (O) for exhausting air is installed in the rear, a short ball (B) is supplied to and recovered by a blasting device (200) while proceeding in a conduit (P) in which a one-way air flow of a predetermined velocity (V) is maintained.
A tank (10) that runs within the above-mentioned pipe (P), in which a front side wall (11) and a rear side wall (12) are formed on the front and rear sides, an inlet (13) through which a short ball (B) flows in is formed on the upper side, and an outlet (14) through which a short ball (B) is discharged is formed on the lower side;
A short ball collection unit (20) located at the front side of the above blasting device (200) to collect short balls (B) that have fallen on the bottom of the pipe (P);
A recovery box (30) for recovering a short ball (B) into the tank (10) through the front side wall (11);
A main supply line (50) connected to the above tank (10) and supplying high pressure air;
A first sub-supply line (60) branched from the main supply line (50) and connected to the short ball collection unit (20) to supply high-pressure air to the short ball collection unit (20);
A transfer line (90) that connects the short ball collection unit (20) and the recovery box (30) and transfers the short ball (B) collected from the short ball collection unit (20) to the recovery box (30);
A main valve (55) installed in the main supply line (50) to open and close the flow path of the main supply line; and
A short ball recovery and supply device for pipeline rehabilitation, characterized in that it includes a sub-valve (65) installed in the first sub-supply line (60) to open and close the flow path of the first sub-supply line (60). In the first paragraph, the short ball collection unit (20)
A hopper (21) into which a short ball (B) is injected from the upper side and a hopper outlet (21a) is formed from the lower side,
A sealed container (22) formed at the bottom of the above hopper (21) and into which short balls (B) discharged through the hopper outlet (21a) are introduced,
An air supply nozzle (23) installed on the side of the above sealed container (22) and connected to the first sub-supply line (60),
A short ball recovery and supply device for pipeline rehabilitation, characterized in that it includes a short ball discharge nozzle (24) installed on the bottom of the sealed container (22) and connected to a transport line (90) for transporting the short ball (B). In the second paragraph, the short ball collection unit (20)
An opening/closing wing (25) that is hingedly connected to the lower side of the hopper outlet (21a) inside the sealed container (22) to selectively open/close the hopper outlet (21a),
A short ball recovery and supply device for pipeline rehabilitation, characterized in that it includes a spring (not shown) that applies elastic force to the opening/closing wing (25) to close the hopper outlet (21a) in a situation where the short ball (B) is not fed into the hopper (21). In the first paragraph,
A short ball recovery and supply device for pipeline rehabilitation, characterized in that it further includes a second sub-supply line (70) branched from the first sub-supply line (60) and supplying high-pressure air to the recovery box (30). In the fourth paragraph, the recovery box (30)
A box body (31) connected to the side wall hole (11a) formed in the front side wall (11),
A first box nozzle (32) installed in the box body (31) and fixed so that the outlet (71) of the second sub-supply line (70) faces the side wall hole (11a) from the inside of the box body (31),
A second box nozzle (33) installed in the above box body (31) and fixed so that the outlet of the transfer line (90) faces the side wall hole (11a),
A short ball recovery and supply device for pipeline rehabilitation, characterized in that it includes a hopper stage (34) installed inside the box body (31) and guiding the short ball (B) discharged from the transfer line (90) to the side wall hole (11a). In the first paragraph,
A dust discharge pipe (40) formed on the upper part of the above tank (10) and connected to a discharge hose (H) extending beyond the blasting device (200); and
A short ball recovery and supply device for pipeline rehabilitation, characterized in that it further includes a third sub-supply line (80) branched from the first sub-supply line (60) and built into the dust discharge pipe (40) to inject high-pressure air toward the discharge hose (H).