JPH09222073A - Auxiliary device for operating oscillation pipe for oscillation valve type concrete pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform smooth jumping up and down of an oscillation pipe during washing the oscillation pipe. SOLUTION: An oscillation pipe 6 is oscillatorily contained in a hopper 1 having two suction delivery ports 2 formed in the lower part of a front wall 1a and laterally juxtaposed with each other. The tip part of a coupling shaft 8 having a base end coupled to the oscillation pipe 6 is positioned at the outside of the hopper 1 in such a state to extend through the hopper front wall 1a. During washing of the oscillation pipe 6, the oscillation pipe 6 is jumped up in such a state to be matched with an opening 23 formed in the upper part of the hopper front wall 1a. A shaft push cylinder 32 to push rearward the oscillation pipe 6 is coupled to and installed at the tip of the coupling shaft 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary device for operating an oscillating pipe in an oscillating valve type concrete pump for sucking and discharging concrete in a hopper.

[0002]

2. Description of the Related Art As a suction / discharge valve for switching concrete for sucking / discharging concrete in a hopper by a concrete pump, a slide valve type is conventionally used.
There is a swing valve type.

The latter oscillating valve type suction / discharge valve includes:
Conventionally, a structure having an example shown in FIGS. 4 to 6 is known. That is, in the front side portion of the hopper 1 in which the two intake / discharge ports 2 are provided side by side at the lower part of the front side wall 1a,
Two concrete pressure-feeding cylinders 3 are installed horizontally corresponding to one suction / discharge port 2, and a piston 4 housed in the concrete pressure-feeding cylinder 3 is integrated with a piston of a main cylinder (not shown) through a rod 5. The pistons 4 in the two concrete pumping cylinders 3 are alternately moved forward and backward by connecting and contracting the two main cylinders alternately.

On the other hand, in the hopper 1, there is housed an S-shaped oscillating tube 6 having a rear end rotatably penetrating the rear side wall 1b of the hopper 1 and connected to a transport tube 12, and the oscillating tube 6 A valve ring 7 is attached to the front end of the valve plate 1 with the valve ring 7 attached to the inner surface of the front side wall 1a of the hopper 1.
The two inlets and outlets 2 can be alternately aligned with each other through 0, and the front side wall 1a of the hopper 1 is pierced in the middle of the rocking tube 6 so as to be rotatably supported by the front side wall 1a. The base end of the connecting shaft 8 is fixed, and the operating lever 9 is integrally attached to the tip end of the connecting shaft 8, and the operating lever 9 is alternately extended and contracted between the two left and right swing cylinders 11 as the swing drive device. The rocking tube 6 is operated by the operation lever 9 and the connecting shaft 8.
Is pivoted to the left and right around the axis of the connecting shaft 8.

In FIGS. 5 and 6, 1c is a step on the left and right sides of the hopper 1, and 13A and 13B are steps 1.
stirring blades attached to the stirring shafts 14A and 14B for causing the concrete 21 of the c portion to flow downward while stirring, 15 and 16 are bearings of the stirring shafts 14A and 14B,
17A and 17B are sprockets attached to one end of the stirring shafts 14A and 14B, and 20A and 20B are stirring motors 18
Sprockets 19A attached to the output shafts of A and 18B,
19B shows an endless chain wound around 19B and the sprockets 17A and 17B.

When the suction and discharge valve of the conventional concrete pump is operated to suck and discharge the concrete 21 in the hopper 1, the swing pipe 6 is swung in the concrete 21 in the hopper 1 to shake the concrete. When the front end of the moving pipe 6 is positioned at one of the suction and discharge ports 2, the piston 4 of the concrete pressure-feeding cylinder 3 on the suction and discharge port 2 side is moved forward to move the concrete 21 that has been sucked up to now into the rocking pipe 6. At the same time as discharging through the inside, the piston 4 is retracted in another concrete pressure feeding cylinder 3 so as to suck the concrete 21 in the hopper 1, and then the rocking pipe 6 is switched to another suction / discharge port 2. The suction / discharge port 2
At the same time that the piston 4 of the concrete pressure-feeding cylinder 3 on the side is moved forward, the concrete 21 is sucked into the other concrete pressure-feeding cylinders 3, and such operation is repeated to switch the suction and discharge of the concrete 21. .

As described above, the concrete 2 in the hopper 1
In the concrete pump in which the piston 4 in the two concrete pressure-feeding cylinders 3 is forwardly and backwardly moved alternately through the rocking pipe 6,
When the pumping work of the concrete 21 is completed, the rocking pipe 6
It is necessary to remove the concrete 21 remaining inside.

Concrete 21 remaining in the rocking pipe 6
In the prior art, the connection between the rocking pipe 6 and the transport pipe 12 was removed when removing the above, but in such a method, the periphery of the rocking pipe rear end on the outside of the hopper 1 may be soiled. In addition, there is a problem that it takes a lot of labor to take out the concrete 21 from the oscillating pipe 6, so that the concrete 21 can be removed and washed by a simple operation and in a short time, and at the same time, the concrete to be removed can be removed. A cleaning method has been proposed in which 21 is not scattered around.

That is, as shown in FIG. 7, an opening 23, which is slightly larger than the diameter of the rocking tube 6, is provided above the front side wall 1a of the hopper 1 and at the position of the rocking radius of the rocking tube 6. The cleaning pipe 22 is attached to the opening 23, and the opening 23 is normally closed to prevent the concrete 21 in the hopper 1 from flowing out. On the other hand, the front position of the front side wall 1a of the hopper 1 is prevented. In addition, a hoisting motor 25 having a drive sprocket 24 on the output shaft is provided as a hoisting drive device on one of the left and right sides of the connecting shaft 8 that penetrates the front side wall 1a and projects forward. With the installation
The driven sprocket 26 is rotatably attached to the tip of the connecting shaft 8 so that the rotational force of the jumping motor 25 is transmitted from the drive sprocket 24 to the driven sprocket 26 via the chain 27, and the driven sprocket is also used. 26 and the operating lever 9, the driven sprocket 26 and the connecting shaft 8 are integrally connected, or the operating lever 9
And the connecting shaft 8 are integrally connected to each other, and a clutch 29 for switching the transmission of the rotational force by the hoisting motor 25 and the swinging force by the operating lever 9 to the connecting shaft 8 is interposed. 1 is equipped with a clutch on / off cylinder 28 on the side opposite to the motor installation side of the connecting shaft 8 projecting forward from the front side wall 1a of the concrete 1.
After the completion of the pumping work of the
By extending 8 to move the clutch 29, the driven sprocket 26 and the connecting shaft 8 are integrated,
Then, by driving the hoisting motor 25, the rotational force of the motor 25 is transmitted from the drive sprocket 24 to the connecting shaft 8 via the chain 27 and the driven sprocket 26 to rotate the rocking tube 6 upward. When the front end of the oscillating pipe 6 communicates with the opening 23 by moving the front end to communicate with the opening 23, the elbow-shaped cleaning pipe 22 is formed.
Is connected to the oscillating pipe 6 by pressing the washing pipe moving cylinder 31 from the outside of the hopper 1 through the opening 23.
By putting the padding 30 in the cleaning pipe 22 and moving the padding 30 in the rocking pipe 6 and the transport pipe 12 with a high-pressure fluid,
The inside of the oscillating pipe 6 and the transport pipe 12 are cleaned.

[0010]

However, as described above, in the type in which the rocking pipe 6 is flipped upward during cleaning, the rocking pipe 6 rocks with the connecting shaft 8 when the clutch 29 is engaged or disengaged or when the cleaning pipe 22 is advanced or retracted. The movement of the moving tube 6 in the front-back direction of the hopper is unavoidable. Therefore, when the rocking tube 6 is to be flipped up,
Since the valve ring 7 of the rocking tube 6 is pressed against the valve plate 10 on the hopper 1 side more than necessary, the rocking tube 6 cannot be smoothly flipped up.
When attempting to return the rocking tube 6 that has been flipped up, a step or galling is generated between the valve ring 7 of the rocking tube 6 and the valve plate 10 in front of the hopper 1, and the rocking tube 6 is lowered. It may be difficult to return.

Accordingly, the present invention is intended to provide an auxiliary device for operating a rocking tube which can smoothly and stably perform a bouncing and lowering operation associated with a cleaning operation of the rocking tube.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention stores a rocking tube in a hopper provided with two suction and discharge ports side by side at a lower portion of a front side wall, and the rocking tube is accommodated in the hopper. The tip end of the connecting shaft, whose base end is connected to the moving tube, is rotatably penetrated through the central part of the front side wall of the hopper so as to project to the outside of the hopper, and the connecting shaft is connected to the projecting position to the outside of the hopper. The dynamic driving device allows the rocking pipe to rock so that the valve ring attached to the front end of the rocking pipe is alternately aligned with each of the suction projecting ports via the valve plate fixed to the inner surface of the front wall of the hopper. Further, during cleaning of the rocking tube, the rocking tube can be flipped up in accordance with an opening provided in an upper portion of the front side wall of the hopper by a jumping drive device connected to a tip end portion of the connecting shaft via a clutch. Of the above connecting shaft in the rocking valve type concrete pump The end, a configuration in which the pressing device for applying a pressing force toward the hopper rear wall direction connected therewith swinging tube.

When the rocking pipe is washed, if the connecting shaft is pressed toward the rear side wall of the hopper by the operation of the pressing device, the pressing force of the valve ring against the valve plate is weakened, so that the rocking pipe is smoothly flipped up. be able to. Even after the washing of the oscillating tube is completed, the oscillating tube can be smoothly lowered and returned by keeping the pressing state of the connecting shaft to the rear by the pressing device.

Further, if the pressing device is operated when the clutch is operated and when the cleaning pipe attached to and detached from the front end of the rocking pipe is retracted, the connecting shaft is automatically moved backward when the rocking pipe is cleaned. As a result, the operation of pushing up and down the rocking tube can be further stabilized.

Further, instead of connecting and installing the pressing device at the tip of the connecting shaft, a guide whose surface portion is formed in a middle-height shape along the longitudinal direction at a position on the inner surface of the front wall of the hopper along the swing-up path of the rocking tube. By arranging the plates and installing them so that one end in the longitudinal direction is continuous with the valve plate, the valve ring moves along the surface of the guide plate when the rocking tube is flipped up and down. Therefore, galling with the valve plate is prevented.

[0016]

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

FIG. 1 shows an embodiment of the present invention. In the structure similar to the rocking valve type concrete pump shown in FIG. 7, a connecting shaft 8 connected to the rocking pipe 6 is provided with a tip end thereof. An axial pushing cylinder 32 as a pushing device that applies a pushing force toward the hopper rear side wall 1b to the rocking tube 6 is connected and installed in a coaxial arrangement, and the connecting shaft 8 is moved backward by the extension operation of the axial pushing cylinder 32. By pushing, the rocking tube 6 can be moved integrally with the connecting shaft 8.

The shaft pushing cylinder 32 is a single-acting cylinder for extension operation, and the pressure oil supply line 33 is connected to the shuttle valve 34.
Of the shuttle valve 34 and one of the inlet portions of the shuttle valve 34 is connected to the pressure oil supply / discharge line 3 of the cleaning pipe moving cylinder 31.
5A, 35B is connected to a pressure oil supply / discharge line 35B, which is a supply line when the rod is shortened, via a communication line 36, and the other inlet of the shuttle valve 34 is connected via a communication line 37 to another shuttle. The shuttle valve 38 is connected to the outlet of the valve 38, and the inlets of the shuttle valve 38 are connected to the pressure oil supply / discharge lines 39A and 39B of the clutch on / off cylinder 28 via the communication lines 40, respectively. 28
When the cleaning pipe 22 is retracted and the cleaning pipe 22 is retracted, the axial pushing cylinder 32 is extended in cooperation with the cleaning pipe moving cylinder 31. Reference numeral 41 is an electromagnetic switching valve provided in the middle of the pressure oil supply / discharge lines 35A and 35B, and 42
Indicates an electromagnetic switching valve provided in the middle of the pressure oil supply / discharge lines 39A, 39B.

When it is necessary to clean the inside of the rocking pipe 6 after the operation of pumping the concrete 21 is completed, the electromagnetic switching valve 42 is operated while the driving of the rocking cylinder 11 is stopped.
To the port b, and the clutch on / off cylinder 28 is extended to put the clutch 29 on the driven sprocket 26 side, and then the jumping motor 25 is driven, and the rotational force thereof is transmitted via the chain 27 to the driven sprocket 26. To tell. As a result, the rocking tube 6 is rotated around the connecting shaft 8 by a predetermined angle and is flipped up to the position of the opening 23 of the hopper front wall portion 1a. At this time, the electromagnetic switching valve 42 is switched to the port b. Pressure oil supply and discharge line 3
The pressure oil branched from 9A to the communication line 40 is shuttle valve 38, communication pipe 37, shuttle valve 34, pressure oil supply line 3
Since it is supplied to the shaft pushing cylinder 32 through 3, the connecting shaft 8 is pushed toward the rear side wall 1b of the hopper 1. Therefore, the valve ring 7 at the front end of the rocking tube 6 is not in a state of being strongly pressed against the valve plate 10 on the hopper 1 side, so that the rocking tube 6 is smoothly flipped up.

When the rocking pipe 6 is flipped up, the electromagnetic switching valve 41 is switched to the port a side to move the cleaning pipe moving cylinder 3
The cleaning pipe 22 is advanced by the extension operation of 1, and the tip of the cleaning pipe 22 is inserted into the front end portion of the rocking pipe 6 through the opening 23,
The padding 30 is put in the cleaning pipe 22, and the padding 30 is moved by a high-pressure fluid to clean the inside of the rocking pipe 6.

When the cleaning of the oscillating pipe 6 is completed, the electromagnetic switching valve 41 is switched to the port b side to retract the cleaning pipe 22, and then the oscillating pipe 6 is flipped down to return to the original position. When the cleaning pipe 22 is retracted, the electromagnetic switching valve 41 of the cleaning pipe moving cylinder 31 is switched to the port b side. Therefore, the pressure oil branched from the pressure oil supply / discharge line 35B to the communication line 36 is transferred to the shuttle valve 34, Since it is supplied to the shaft pressing cylinder 32 through the pressure oil supply line 33, the state in which the connecting shaft 8 is pressed rearward is maintained. Therefore, the rocking tube 6 is smoothly returned to its original position without the valve ring 7 at the front end of the rocking tube 6 being bitten by the valve plate 10. After the oscillating pipe 6 is returned to the original position, the clutch 29 is put into the operating lever 9 side by the clutch on / off cylinder 28. At this time, the electromagnetic switching valve 4
Even if 2 is switched to the port b side, the pressure oil supply / discharge line 3
Since the pressure oil branched from 9B to the communication line 40 is supplied to the shaft pushing cylinder 32, the connecting shaft 8 can also be maintained in the state of being pushed backward. This prevents the connecting shaft 8 from rattling when the clutch 29 is turned on and off.

In this way, when the clutch 29 is engaged or disengaged and the cleaning pipe 22 is retracted, the shaft pushing cylinder 32 is interlocked to automatically push the connecting shaft 8 rearward.
It is possible to reasonably and stably perform the upward and downward movement of the rocking tube 6.

Next, FIGS. 2 and 3 show another embodiment of the present invention. In a rocking valve type concrete pump similar to that shown in FIG. 7, a rocking pipe on the inner surface of the hopper front side wall 1a is used. A flat portion 43A is provided at the center of the surface portion in the longitudinal direction at a position along the trace of the flip-up axis, and the flat portion 43A is provided.
Taper portions 43B and 43 that have a downward slope from
A guide plate 43 of a middle height formed by C is arranged and attached so that the end of the one taper portion 43B is continuous with the surface of the valve plate 10. When the valve ring 7 of No. 6 is slid along the guide plate 43,
Is pushed backwards. The tapered portions 43B and 43C of the guide plate 43 are formed so that the tapered portion 43C has a gentler gradient than the tapered portion 43B.

As shown in FIGS. 2 and 3, when the rocking tube 6 is flipped up, even if the connecting shaft 8 is pushed forward, the valve ring 7 is moved backward along the taper portion 43B. Is pushed away from the valve plate 10 as shown by the chain double-dashed line, and after passing through the flat portion 43A,
The taper portion 43C is guided so as to gently slide down, and when the rocking tube 6 is to be slid down, the valve ring 7 is brought into contact with the valve plate 10 in the process reverse to the above. Therefore, the galling of the valve ring with respect to the valve plate 10 is prevented.

Although the embodiment of FIGS. 2 and 3 shows the case where the guide plate 43 having the tapered portions 43B and 43C on both ends of the surface portion is used, the surface portion has a smooth middle and high height. Of course, a curved surface may be used, and various changes may be made without departing from the scope of the invention.

[0026]

As described above, the auxiliary device for operating the rocking pipe in the rocking valve type concrete pump of the present invention exhibits the following excellent effects. (1) The oscillating tube is housed in a hopper provided with two inlets and outlets side by side at the bottom of the front side wall, and the tip of the connecting shaft whose base end is connected to the oscillating tube is connected to the front wall of the hopper. A valve ring attached to the front end of the rocking tube is attached to the hopper by a rocking drive device connected to the protruding position of the connecting shaft to the outside of the hopper by rotatably penetrating the central part of the rocking pipe. Through a valve plate fixed to the inner surface of the front side wall of the rocking pipe so that the rocking pipe can be rocked so as to be alternately aligned with each of the suction projection ports,
Further, during cleaning of the rocking tube, the rocking tube can be flipped up in accordance with an opening provided in an upper portion of the front side wall of the hopper by a jumping drive device connected to a tip end portion of the connecting shaft via a clutch. At the tip of the connecting shaft in the valve operated concrete pump, a pressing device for applying a pressing force toward the rear wall of the hopper to the swinging pipe is connected and installed. By pressing to the valve plate, the pressing force of the valve ring at the front end of the rocking tube against the valve plate can be weakened, so that the rocking tube can be smoothly flipped up and down smoothly and stably. (2) When the clutch is activated and the cleaning pipe attached to and detached from the front end of the rocking pipe is retracted, the pressing device is activated to automatically push the connecting shaft backward when cleaning the rocking pipe. Therefore, the bouncing and lowering operation of the rocking tube can be further stabilized. (3) Instead of connecting and installing a pressing device at the tip of the connecting shaft, a guide plate with a surface portion having a middle-height shape along the longitudinal direction is provided at a position along the rocking tube flip-up trajectory on the inner surface of the front wall of the hopper. The valve ring at the front end of the oscillating tube slides against the surface of the guide plate when the oscillating tube is flipped up and down by arranging it so that one end in the longitudinal direction is connected to the valve plate. Since it is guided away from the valve ring, galling of the valve ring with the valve plate can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of an auxiliary device for operating a rocking pipe in a rocking valve type concrete pump of the present invention.

FIG. 2 shows another embodiment of the present invention, which is shown in FIG.
It is a schematic diagram corresponding to the II direction arrow.

FIG. 3 is an enlarged view taken along a line III-III in FIG. 2;

FIG. 4 is a schematic sectional side view showing an example of a swing valve type concrete pump.

FIG. 5 is a plan view of FIG.

6 is a view taken in the direction of arrows VI-VI in FIG. 5;

FIG. 7 is a schematic sectional side view showing a recently proposed rocking tube cleaning system.

[Explanation of symbols]

 1 Hopper 1a Front Side Wall 1b Rear Side Wall 2 Suction and Discharge Port 6 Swing Pipe 7 Valve Ring 8 Connection Shaft 10 Valve Plate 22 Cleaning Pipe 23 Opening 25 Jumping Motor (Jump Drive Device) 29 Clutch 32 Axial Push Cylinder (Pushing Device) ) 43 Guide plate

Claims (3)

[Claims] 1. A swinging tube is housed in a hopper having two suction and discharge ports arranged side by side at a lower portion of a front side wall, and a tip end of a connecting shaft having a base end connected to the swinging tube is connected to a hopper. A valve ring attached to the front end of the oscillating tube by an oscillating drive device in which the central portion of the front side wall is rotatably pierced so as to project to the outside of the hopper, and the connecting shaft is connected to the projecting position to the outside of the hopper. Through a valve plate fixed to the inner surface of the front wall of the hopper so that the rocking pipe can be rocked so as to be alternately aligned with each of the suction projecting ports. Furthermore, when cleaning the rocking pipe, the tip of the connecting shaft is The rocking pipe can be flipped up in accordance with the opening provided in the upper part of the front side wall of the hopper by the jumping drive device connected to the shaft via the clutch. Apply the pressing force to the pipe toward the rear wall of the hopper. An auxiliary device for operating an oscillating pipe in an oscillating valve type concrete pump, characterized in that a pressing device for applying is connected and installed. 2. The rocking pipe in a rocking valve type concrete pump according to claim 1, wherein the pressing device is operated when the clutch is operated and when the cleaning pipe attached to and detached from the front end of the rocking pipe is retracted. Auxiliary device for operation. 3. A guide having a middle-height surface portion along the longitudinal direction at a position along the rocking tube flip-up locus on the inner surface of the front wall of the hopper, instead of connecting and installing the pressing device at the tip of the connecting shaft. The auxiliary device for operating the oscillating pipe in the oscillating valve type concrete pump according to claim 1, wherein the plate is arranged so that one end in the longitudinal direction is connected to the valve plate.