JPH08144942A - Oscillation valve type concrete pump - Google Patents

Abstract

PURPOSE: To prevent an oscillation tube from interfering with an agitation vane, when the tube is sprung up and washed. CONSTITUTION: An oscillation tube 6 housed in a hopper 1 is sprung up for use. Also, agitation shafts 14A and 14B with agitation vanes 13A and 13B are laid at right and left positions within the hopper 1. Furthermore, the shafts 14A and 14B are driven on the operation of agitation motors 18A and 18B. Also, a proximity sensor detection striker 34 is fitted at least to the shaft 14A positioned at the springing-up side of the tube 6. A proximity sensor LS is fixed in alignment with the position of the vane 13A not interfering with the tube 6 at a springing-up process, so as to correspond to the striker 34. Also, the direction of the vane 13A is selected with the sensor LS before the tube 6 is sprung up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocking valve type concrete pump for sucking and discharging concrete in a hopper.

[0002]

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

The latter oscillating valve type intake / discharge valve includes
Conventionally, a structure having an example shown in FIGS. 6 to 8 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 portion of the front side wall 1a, the above-mentioned 2
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 rocking 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 rocking tube 6 is provided. A seal ring 7 is attached to the front end of the hopper so that the seal ring 7 can be alternately aligned with the two suction and discharge ports 2, and the front side wall 1a of the hopper 1 is penetrated in the middle of the swing tube 6. The base end of the connecting shaft 8 rotatably supported on the front side wall 1a is fixed, and the operating lever 9 is integrally attached to the tip end of the connecting shaft 8 so that the operating lever 9 is provided on the left and right sides. The operation lever 9, by the alternating expansion and contraction operation of the rocking cylinders 10 and 11,
The rocking tube 6 is rocked to the left and right around the axis of the connecting shaft 8 via the connecting shaft 8.

If the hopper 1 has stepped portions 1c on both the left and right sides as shown in FIG. 8, two left and right stirring shafts 14A arranged in the front-rear direction so as to be located at the stepped portions 1c,
14B is rotatably supported on the front side wall 1a and the rear side wall 1b through bearings 15 and 16, and each stirring shaft 14A, 14B is supported.
In accordance with the shape of the stepped portion 1c, the stirring blades 13A, 13
B are attached to the respective end portions of the stirring shafts 14A, 14B protruding from the rear side wall 1b, and the sprocket 17A,
17B is attached and the sprockets 17A, 1
7B and the sprocket 19A, 19B attached to the output shaft of the agitating motor 18A, 18B, the endless chain 20A, 20B is wound around, the agitating motor 18A, 1B.
8B drive the stirring blades 13 through the stirring shafts 14A and 14B.
By rotating A and 13B and stirring the concrete 21, the concrete 21 is made to flow downward from the left and right positions in the hopper 1.

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 FIGS. 9 and 10, an opening 23 slightly larger than the diameter of the rocking tube 6 is provided at the upper part of 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 side wall 1a of the hopper 1 is provided. To the front position of the connecting shaft 8 which penetrates through the front side wall 1a and projects forward, the drive sprocket 24 is attached to the output shaft.
The hoisting motor 25 having the above is installed as a hoisting drive device, and the driven sprocket 26 is rotatably attached to the tip end portion of the connecting shaft 8 so that the rotational force of the hoisting motor 25 is driven by the drive sprocket 24. To the driven sprocket 26 through the chain 27, and the driven sprocket 26 and the connecting shaft 8 are integrally connected between the driven sprocket 26 and the operating lever 9, or the operating lever 9 and the connecting shaft are connected. A clutch 2 for switching the transmission of the rotational force of the jumping motor 25 and the swinging force of the operating lever 9 to the connecting shaft 8 by integrally connecting 8
9, a clutch insertion / disconnection cylinder 28 is provided on the opposite side of the connecting shaft 8 projecting forward from the front side wall 1a of the hopper 1 to the side where the motor is installed. After the completion of the operation, the clutch engagement / disengagement cylinder 28 is extended to operate the clutch 2
9 is moved to integrate the driven sprocket 26 and the connecting shaft 8, and then the hoisting motor 25 is driven to connect the rotational force of the motor 25 from the drive sprocket 24 via the chain 27 and the driven sprocket 26. Axis 8
The rocking tube 6 is rotated so as to bounce upward so that the front end communicates with the opening 23.
When the front end of the cleaning pipe 22 communicates with the opening 23, the cleaning pipe 22 having an elbow shape is pressed from the outside of the hopper 1 to the swing pipe 6 through the opening 23 by the operation of the cleaning pipe moving cylinder 31 to connect the cleaning pipe 22 inside the cleaning pipe 22. The inside of the oscillating pipe 6 and the transport pipe 12 is cleaned by placing the stuffing 30 in the container and moving the stuffer 30 in the oscillating pipe 6 and the transport pipe 12 with a high-pressure fluid.

[0010]

However, in the case of adopting the above-mentioned cleaning method, when the rocking tube 6 is flipped up, the stirring blade 13A (or 13B) on the flipping up operation sideways rocks. If the pipe 6 is located within the flip-up locus, the rocking pipe 6 is moved by the stirring blade 1 when the rocking pipe 6 is flipped up.
There is a problem that it cannot interfere with 3A (or 13B) to jump up, so that it is necessary for the worker to adjust the orientation of the stirring blade 13A (or 13B) while looking into the hopper 1, Problems arise in terms of efficiency and smoothness.

In view of the above, the present invention relates to a rocking valve hoisting type rocking valve type concrete pump, in which when a rocking pipe is flipped up, a stirring blade located on the rocking pipe flipping up operation side is rocked. It is intended to prevent the rocking tube that is automatically stopped and jumped out of the bouncing trajectory of the tube from interfering with the stirring blade.

[0012]

According to the present invention, in order to solve the above-mentioned problems, a swing 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 one end thereof is A rocking cylinder is rockable so as to alternately coincide with the respective suction and discharge ports, and at the time of cleaning the rocking tube, the rocking tube is moved up in accordance with an opening provided in an upper portion of a front side wall of the hopper. And the left and right stirring shafts provided with stirring blades are arranged at the left and right positions in the hopper so that they can be rotated by the driving force from the stirring motor.
A proximity sensor detection striker is attached to at least a position on the agitation shaft located on the flip-up operation side of the rocking tube, and further, a stirring blade when the rocking tube is flipped up so as to correspond to the detection striker. A non-contact type proximity sensor is fixedly installed at a position where does not interfere with the rocking tube.

A clutch for switching between rocking of the rocking tube by the rocking cylinder and flipping up by the jumping drive device is provided.
It is preferable to have a circuit configuration in which the proximity sensor detects the detection striker and then switches to the flip-up side to flip up the rocking tube.

[0014]

When the rocking pipe is washed, the stirring shaft located on the rocking pipe flip-up operation side is rotated, and the rotation of the stirring shaft is stopped when the detection striker is detected by the proximity sensor. To do. As a result, the stirring blade is moved to the stop position out of the trajectory of the rocking tube so that interference with the stirring blade is prevented when the rocking tube is flipped up.

Further, when the clutch is switched from the rocking tube rocking drive side to the flip-up drive side after detecting the detection striker by the proximity sensor, the stirring blade is shaken after being stopped upward. The moving tube is automatically flipped up.

[0016]

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

FIGS. 1 and 2 show an embodiment of the present invention. In the same construction as the rocking valve type concrete pump shown in FIGS. 9 and 10, the left and right stirring blades 13A and 13B are provided. Of the stirring shafts 14A and 14B, at least a position of the stirring motor that is located on the flip-up operation side of the rocking tube 6 (the stirring shaft on the left side in this embodiment) 14A that faces the inner surface of the sprocket 17A. A non-contact type proximity sensor LS is fixedly installed via a bracket 33 by using a mounting base 32 of 18A, and the stirring blade 13A deviates from the flip-up trajectory 6a of the rocking tube 6 by the rotation of the stirring shaft 14A. When the position or the like is reached, the proximity sensor L
The detection striker 34 corresponding to the proximity sensor LS is attached to the sprocket 17A so that it is in the position detected by S.
When the rocking pipe 6 is cleaned, the clutch 29 is stopped by selecting the stop position of the stirring blade 13A in the upward direction or the like when the rocking pipe 6 is washed.
The oscillating tube 6 is placed on the side of No. 5 so that the oscillating tube 6 is automatically lifted by the motor 25. 3
Reference numeral 5 denotes an electromagnetic switching valve for switching the direction and stop of the pressure oil to the stirring motors 18A and 18B, and 36 denotes an electromagnetic switching valve for switching the supply and discharge of the pressure oil of the clutch on / off cylinder 28.
Other configurations are the same as those shown in FIGS. 9 and 10.
The same components are designated by the same reference numerals.

FIG. 3 shows an electric circuit for stopping the stirring blade 13A and switching the clutch 29.
P and N are power supply lines, 37 is a stirring blade position detection control line, 38 is a stirring motor control line, 39 is a clutch on / off cylinder control line, and the stirring blade position detection control line 37 has an operation selection switch. By inserting SW-1, the proximity sensor LS that detects the striker 34 when the agitating motor 18A is operated and the agitating blade 13A rotates to be in an operating state, and the proximity sensor LS detects A relay Ry is provided which is excited when the position of the striker 34 is detected, and the stirring motor control line 38 is provided with a contact b Ry which is turned off by the excitation of the relay Ry.
And the solenoid SOL. Of the electromagnetic switching valve 35 for the stirring motor 18A. 1, SOL. 2 is provided, and further, in the clutch on / off cylinder control line 39, an a contact Ry that is turned on by the excitation of the relay Ry,
Solenoid SOL. For extension operation of solenoid switching valve 36 for clutch on / off cylinder 28. 3, SOL. 4 and are provided. Although not shown, the solenoid SOL. 3
Is energized to switch the electromagnetic switching valve 36 to put the clutch 29 on the hoisting motor 25 side, and then the hoisting motor 25 is driven to hoist the rocker tube 6, and the rocker tube 25 is driven. When 6 is flipped up, the cleaning pipe moving cylinder 31 is extended so as to press the cleaning pipe 22 against the tip of the rocking pipe 6.

When it is necessary to clean the inside of the rocking pipe 6 and the transportation pipe 12 after the concrete pumping work is completed, the operation selection switch SW-1 is turned on to flip up the rocking pipe 6. . When the operation selection switch SW-1 is turned on, the control line 38 in the electric circuit of FIG. 3 is energized, so that the electromagnetic switching valve 3 for the stirring motor 18A is turned on.
5 solenoid SOL. 1 or SOL. 2 is excited. As a result, the stirring motor 18A is driven, and the rotational force thereof is transmitted to the stirring shaft 14A via the sprocket 19A, the chain 20A, and the sprocket 17A, so that the stirring blade 13A is rotated. At this time,
When the sprocket 17A on the stirring shaft 14A is rotationally displaced and the detection striker 34 attached to the inner surface of the sprocket 17A reaches the position of the fixed-side proximity sensor LS, the proximity sensor LS detects the detection striker 34. Therefore, the proximity sensor LS is turned on and the control line 37
Relay Ry is excited, and contact b Ry of control line 38
Is turned off, and at the same time, the contact a Ry of the control line 39 is turned on.

When the contact b Ry is turned off, the solenoid SOL. 1 or SOL. Since 2 is demagnetized, the electromagnetic switching valve 35 is switched to the pressure oil cutoff position, the drive of the stirring motor 18A is stopped, and the position of the stirring blade 13A on the stirring shaft 14A is fixed. At this time, the detection striker 34 is the stirring blade 1
Since the 3A is attached at a position where it is detected by the proximity sensor LS when it is facing upward, the left stirring blade 13A is stopped in the upright state as shown in FIGS. 1 and 2.

On the other hand, when the contact a Ry of the control line 39 is turned on, the solenoid SOL. Since 3 is excited, the electromagnetic switching valve 36 is switched, the clutch on / off cylinder 28 is extended, and the clutch 29 is switched from the operating lever 9 side to the stirring motor 28 side.

Therefore, when the hoisting motor 25 is driven next, the rotational force is transmitted to the connecting shaft 8 via the sprocket 24, the chain 27, and the sprocket 26, so that the rocking tube 6 in FIG. It is rotated clockwise by a predetermined angle and flipped up to the position of the opening 23 of the hopper front side wall 1a. At this time, since the stirring blade 13A is in the upward posture and is located outside the flip-up trajectory 6a of the rocking tube 6, it does not interfere with the stirring blade 13A when the rocking tube 6 is flipped up. Absent. Then, the washing pipe 22 is pressed through the opening 23 by the operation of the washing pipe moving cylinder 31 (see FIG. 9) against the tip of the rocking pipe 6, and washing is performed.

In the above embodiment, the case where the clutch 29 is switched and the rocking pipe 6 is flipped up is interlocked with the detection of the stop position of the stirring blade 13A has been described, but the clutch 29 may be disconnected after the switching. .

Next, FIGS. 4 and 5 show another embodiment of the present invention. In the same construction as the above embodiment, one end of each stirring shaft 14A, 14B is made to penetrate the rear side wall of the hopper 1. The sprocket 17A, 17B adapted to receive the rotational driving force of the agitating motors 18A, 18B is attached to one end of each agitating shaft 14A, 14B, and the agitating shaft 14A located on the flip-up operation side of the rocking tube 6 is attached. Upper sprocket 17
Proximity sensor LS is fixedly installed at a position facing one side surface of A, and is adjusted to a position where stirring blade 13A does not interfere with rocking tube 6 when rocking tube 6 is flipped up on one side surface of sprocket 17A. Instead of installing the detection striker 34 corresponding to the proximity sensor LS, the stirring shaft 14A,
The stirring motors 18A, 18B are attached to one end of 14B via a direct connection or a reduction box, and the proximity sensor detection striker 34 is attached to at least the other end of the stirring shaft 14A located on the flip-up operation side of the rocking tube 6. Further, a proximity sensor LS is attached to the shaft cover 41 side at the other end of the stirring shaft 14A in such a position that the stirring blade 13A does not interfere with the swinging pipe 6 when the swinging pipe 6 is flipped up. .

In the case of the embodiment shown in FIGS. 4 and 5, the same effect as that of the above embodiment can be obtained.

[0026]

As described above, according to the rocking valve type concrete pump of the present invention, the detecting striker is attached to at least the position on the stirring shaft located on the flip-up operation side of the rocking pipe, and the detecting striker is attached. Since the proximity sensor corresponding to the striker is fixedly installed in such a position that the stirring blade does not interfere with the rocking tube when the rocking tube is flipped up, when the rocking tube is flipped up and washed, By rotating the stirring shaft located on the flip-up operation side and stopping the rotation of the stirring shaft when the detection striker is detected by the proximity sensor, the stirring blade on the stirring shaft is rotated. Since it can be located outside the motion locus, it is possible to prevent the rocking tube from interfering with the stirring blade when the rocking tube is flipped up. Stirring feather that was going Able to adjust the position of the unnecessary, streamlining of the cleaning operation, it is possible to smooth,
Also, after the proximity sensor detects the detection striker, the clutch is switched from the rocking tube swing drive side to the flip-up drive side, whereby the stirring blade is stopped upward. After that, the rocking tube can be automatically flipped up, and the cleaning operation can be smoothly performed, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a plan view showing an outline of an embodiment of a rocking valve type concrete pump of the present invention.

FIG. 2 is a schematic sectional view taken along the line II-II in FIG.

FIG. 3 is an electric circuit diagram of a main part of the rocking valve type concrete pump of the present invention.

FIG. 4 is a plan view showing the outline of another embodiment of the present invention.

FIG. 5 is a partial cross-sectional view showing a part of FIG. 4 in an enlarged manner.

FIG. 6 is a schematic sectional side view showing an example of a swing valve type concrete pump.

FIG. 7 is a plan view of FIG. 6;

8 is a schematic sectional view taken along the line VIII-VIII in FIG.

FIG. 9 is a schematic sectional side view showing a recently proposed rocking tube cleaning system.

FIG. 10 is a plan view of FIG.

[Explanation of symbols]

 1 Hopper 1a Front Side Wall 1b Rear Side Wall 2 Intake / Discharge Port 6 Swing Pipe 8 Connecting Shafts 10, 11 Swing Cylinders 13A, 13B Stirring Blades 14A, 14B Stirring Shafts 17A, 17B Sprocket 18A, 18B Stirring Motor 23 Opening 25 Jumping Motor (jumping drive device) 29 Clutch 34 Detection striker LS Proximity sensor

Claims (2)

[Claims] 1. A swinging tube is housed in a hopper having two suction and discharge ports arranged side by side at the lower part of the front side wall, and the swing cylinder is shaken so that one end thereof is alternately aligned with each of the suction and discharge ports. It is movable, and at the time of cleaning the rocking tube, the rocking tube can be flipped up by a hoisting drive device in accordance with an opening provided in the upper part of the front side wall of the hopper, and the rocking tube can be moved to the left and right positions in the hopper. Arrange the left and right stirring shafts with stirring blades so that they can be rotated by the driving force from the stirring motor,
A proximity sensor detection striker is attached to at least a position on the agitation shaft located on the flip-up operation side of the rocking tube, and further, a stirring blade when the rocking tube is flipped up so as to correspond to the detection striker. An oscillating valve type concrete pump characterized in that a non-contact type proximity sensor is fixedly installed at a position where does not interfere with the oscillating tube. 2. A clutch for switching between rocking of a rocking tube by a rocking cylinder and flipping up by a jumping drive device is switched to a flip-up side after a detection striker is detected by a proximity sensor to bounce the rocking tube. The rocking valve type concrete pump according to claim 1, further comprising a circuit configuration for raising the rocking valve type concrete pump.