JPH0628235Y2 - Air supply device for cleaning the air of concrete transportation pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an air supply device for cleaning concrete transport pipes.

[Conventional technology]

Generally, in a concrete pump, when the work of sending the ready-mixed concrete from the hopper to the setting site through the concrete transport pipe is finished, the ready-concrete remains in the concrete transport pipe and the hopper. In order to remove the remaining raw concrete in the concrete transport pipe, remove the concrete transport pipe from the discharge port of the concrete pump,
For example, compressed air is supplied from a compressor into a concrete transportation pipe to discharge fresh concrete.

In response to such demands, for example, an air supply device for cleaning the air of a concrete transportation pipe of a concrete pump shown in FIG. 5 is known. In the figure, 101 is a concrete transport pipe, in which the fresh concrete C remains, and after the filling 103 such as sponge is put from the end portion 102 of the concrete transport pipe 101, the concrete transport pipe 101 A connecting pipe 104 for air cleaning is connected to the end portion 102 of the pipe, compressed air is sent from the hose 105 to move the filling 103 along the axial direction in the concrete transport pipe 101, and the ready-mixed concrete C is a pipe of the concrete transport pipe 101. It is discharged from the edge.

[Problems to be solved by the device]

However, in general, the pressure of compressed air is 7 kg / cm ² ,
When the raw concrete C remaining in the concrete transport pipe 101 is low, in particular, when the raw concrete C is hard-mixed raw concrete for civil engineering, as shown in FIG. 6, the stone portion C ₁ of the raw concrete C is the concrete transport pipe. Inner wall surface 101
If the concrete transportation pipe 101 is near A and the length of the concrete transportation pipe 101 is long, the contact resistance of the stone portion C _{1 to} the inner wall surface 101A is large, and the fresh concrete C may not be extruded and discharged.

Here, once the filling 103 inside the concrete transport pipe 101 starts to move by the pressure of the compressed air, the raw concrete C remaining together with the filling 103 can be discharged from the inside of the concrete transport pipe 101.
When 03 does not move, the portion of the concrete transport pipe 101 where the fresh concrete C is filled is hit. As a result, as shown in FIG. 7, the stone portion C _{1 of the} ready-mixed concrete near the inner wall surface 101A of the concrete transport pipe 101
To the central portion of the concrete transport pipe 101 to reduce the resistance inside the pipe and facilitate the discharge of the ready-mixed concrete C. It is empirically known that this method is effective.

However, when tapping, there is a problem that it takes a long working time because it has to be tapped over a considerable range of the long concrete transport pipe 101.

The present invention has been made to solve the above-mentioned problems, and its purpose is to reduce the resistance of concrete in a concrete transport pipe over a considerable range without the need to hit it by hand, and to reduce its working time. It is an object of the present invention to provide an air supply device for cleaning the air of a concrete transportation pipe, which can reduce the amount of waste.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides an air for a concrete transportation pipe comprising a hose for sending compressed air and an air cleaning connecting pipe for connecting a tip of the hose and an end of the concrete transportation pipe. In the cleaning air supply device, a direction switching valve is provided in the middle of the hose, an air vibrator is connected to the direction switching valve via a branch pipe, and the air vibrator is fixed to the air cleaning connection pipe. Is.

[Action]

In the present invention, the direction switching valve is operated to supply the compressed air to the pneumatic vibrator via the branch pipe and to stop the supply of the compressed air into the concrete transportation pipe. As a result, the air vibrator operates with compressed air, and the vibration of this air vibrator is transmitted to the concrete transport pipe, and the vibration of the concrete transport pipe causes the stone part of the ready-mixed concrete near the inner wall surface of the concrete transport pipe to become concrete. The resistance in the pipe decreases toward the center of the pipe.

Then, the direction switching valve is operated to stop the supply of the compressed air to the pneumatic vibrator, and the compressed air is supplied into the concrete transportation pipe through the switching valve and the air cleaning connecting pipe. As a result, the ready-mixed concrete in the concrete transport pipe is pushed out by the pressure of the compressed air.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

1 to 4 show an air supply device for cleaning concrete transportation pipe according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 is a hose for sending compressed air, and a first three-way rotary direction switching valve 2 is provided in the middle of this hose 1.
Is provided with a switching valve. An end of the hose 1 is connected to an air inlet 2A of the first three-way rotary direction switching valve 2, and an air vibrator 4 is connected to a first air outlet 2B thereof via a branch pipe 3, The connecting pipe 5 is connected to the second air outlet 2C, and the connecting pipe 5
A second three-way port rotary directional control valve 6 for air discharge is provided in the middle of. As shown in FIG.
The three-way opening rotary direction switching valve 6 has an air inlet 6A that communicates with the connecting pipe 5, a second air outlet 6C, and a first air outlet 6B that communicates with the discharge pipe 12.

Reference numeral 7 is an air-cleaning connection pipe, which is configured as a bottomed cylindrical body having one end opened, and a bottom 7A is provided with a hole 7B, and the end of the connection pipe 5 is connected to this hole 7B. In this air cleaning connection pipe 7, the flange 7a at the end portion on the opening side is
The concrete transport pipe 9 is connected to the concrete transport pipe 9 by abutting against the flange 9A at the end of the concrete transport pipe 9 via the sandwiching type joint 8.

And, the air type vibrator 4 is a connection pipe 7 for air cleaning.
It is fixed by a bolt 10 to a bracket 10A that is fixed to the.

In the figure, 2D is a lever for the switching operation of the first three-way rotary direction switching valve 2, and 6D is a lever of the three-way rotary direction switching valve 6 for the second switching operation.

Next, the operation of this embodiment will be described.

First, as shown in FIG. 1, a filling material 11 such as a sponge is inserted into the concrete transportation pipe 9 separated from the discharge port of the concrete pump, and the concrete transportation pipe 9 and the air cleaning connection pipe 7 are connected to each other at their ends. Flanges 9A, 7a
Are brought into contact with each other and connected by the joint 8.

Next, by operating the lever 2D of the first three-way opening rotary direction switching valve 2, as shown in FIG. 2, the air inlet 2A and the second air outlet 2C are communicated with each other, and the first air outlet 2B. Close. At the same time, the lever 6D of the second three-way opening direction switching valve 6 is operated, and its air inlet 6A and its second
The air outlet 6C is communicated, and the first air outlet 6B is closed.

When compressed air is sent from the hose 1 in this state, the compressed air flows as shown by an arrow and is guided into the concrete transport pipe 9. If the stuffing 11 moves, the compressed air continues to be supplied. If the stuffing 11 does not move, the first state is changed to the first one.
Only the lever 2D of the three-way opening direction switching valve 2 is operated to change its state as shown in FIG. That is, the air inlet 2A and the first air outlet 2B of the first three-way rotary direction switching valve 2 are communicated with each other, and the second air outlet 2C is closed.

When compressed air is sent from the hose 1 in this state, the compressed air is supplied to the pneumatic vibrator 4 and is not supplied to the concrete transport pipe 9. As a result, the pneumatic vibrator 4 is operated by compressed air, the vibration of the pneumatic vibrator 4 is transmitted to the concrete transport pipe 9, and the vibration of the concrete transport pipe 9 causes the stone of the fresh concrete C in the vicinity of the inner wall surface 9B thereof to move. Part C ₁ is the concrete transport pipe 9
Since the resistance in the tube decreases toward the center of the valve, the lever 2D of the first three-way opening rotary direction switching valve 2 is operated to return it to the same state as in FIG.

In the state shown in FIG. 2, the supply of compressed air to the air-type vibrator 4 is stopped, and the compressed air is passed through the first and second three-way rotary direction switching valves 2 and 6 and the air cleaning connection pipe 7. It is supplied to the concrete transport pipe 9 and advances through the concrete transport pipe 9 while pushing out the filling 11, and the raw concrete remaining in the concrete transport pipe 9 is discharged from the end (not shown) of the concrete transport pipe 9 by the pressure of compressed air. .

Immediately before the cleaning is completed, the lever 6D of the second three-way opening rotary direction switching valve 6 is operated, and as shown in FIG.
Air inlet 6A of the second three-way rotary direction switching valve 6
Is closed, and the first air outlet 6B and the second air outlet 6C are connected. As a result, the compressed air in the concrete transport pipe 9 is transferred to the first three-way rotary direction switching valve 6 in the first direction.
The air is discharged from the air outlet 6B to prevent a burst.

According to the above configuration, the concrete transportation pipe 9 is vibrated from the air vibrator 4 by the air source for cleaning air.
By virtue of the vibration of the concrete transport pipe 9, the stone portion C of the ready-mixed concrete near the inner wall surface 9B
₁ is closer to the central portion of the concrete transport pipe 9, and the resistance inside the pipe is reduced.

Further, unlike the conventional example, since it is possible to apply vibration to the entire concrete transport pipe 9 by the air type vibrator 4, the effect of removing the clogging of the fresh concrete into the concrete transport pipe is great, and there is no problem in transporting the fresh concrete. It is possible to reduce the work time for the solution.

Moreover, since the air-type vibrator 4 uses the same air source as the air source for cleaning the air, it is not necessary to separately provide a drive source, the facility cost is low, and it can be easily implemented. .

In this embodiment, the first three-way rotary direction switching valve 2 is described as an example of the switching valve, but the switching valve is not limited to this.

[Effect of device]

As described above, according to the present invention, by vibrating the concrete transportation pipe from the air vibrator, the vibration of the concrete transportation pipe causes the portion of the raw concrete stone near the inner wall surface of the concrete transportation pipe to be transported by the concrete transportation pipe. The resistance in the tube decreases toward the center of the tube. Therefore, the ready-mixed concrete can be easily discharged.

Also, unlike the conventional example, since it is possible to give vibration to the entire concrete transportation pipe with an air-type vibrator, there is no need to manually tap a considerably long range of the concrete transportation pipe to give vibration, and the concrete transportation It is possible to carry out the work for solving the above problems in a short time.

Moreover, since the air-type vibrator uses the same air source as the air source for cleaning the air, it is not necessary to provide a separate drive source, the facility cost is low, and it can be easily implemented. Play.

[Brief description of drawings]

FIG. 1 is an air supply device for cleaning air of a concrete transportation pipe according to an embodiment of the present invention. 2 to 4 are explanatory views of the operating state of the air supply device for air cleaning of the concrete transport pipe. FIG. 5 is a partial cross-sectional side view of a conventional air supply device for cleaning air of a concrete transportation pipe of a concrete pump. 6 and 7 are sectional views of the concrete transport pipe of FIG. [Explanation of symbols for main parts] 1 ... Hose 2 ... First three-way rotary direction switching valve 3 ... Branching pipe 4 ... Air type vibrator 7 ... Air cleaning connection pipe 9 ... Concrete transportation tube.

Claims (1)

[Scope of utility model registration request] 1. An air cleaning air supply device for a concrete transportation pipe, comprising: a hose for feeding compressed air; and an air cleaning connection pipe for connecting a tip of the hose and an end of the concrete transportation pipe, A concrete transportation pipe characterized in that a direction switching valve is provided in the middle of the hose, an air vibrator is connected to the direction switching valve via a branch pipe, and the air vibrator is fixed to the air cleaning connection pipe. Air supply device for air cleaning.