JP2001082322A - Concrete pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discharge concrete sequentially irrespective of blending of the concrete, and the like. SOLUTION: In this concrete pump, cylinders 3a, 3b for force feeding of concrete are respectively connected to two intake/discharge ports 2a, 2b arranged side by side in a side wall of a hopper 1, and the two intake/discharge ports 2a, 2b alternately communicate with the cylinders 3a, 3b, respectively, by rocking in the lateral direction a rocking pipe 11 provided to be capable of rocking inside the hopper 1, thereby respectively switching the cylinders 3a, 3b for force feeding of concrete to suction side/discharge side. In this concrete pump, the side wall of the hopper 1 is formed with a dynamic pressure generator 18 which applies a dynamic pressure to a concrete C inside the hopper 1.

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 Generally, concrete pumps are shown in FIGS.
As shown in FIG. 8, a hopper 1 for charging concrete C
At the lower part of the side wall, two suction / discharge ports 2a, 2b are formed in parallel, and outside the hopper 1, concrete pumping cylinders 3a, 3b communicating with the suction / discharge ports 2a, 2b are installed in parallel.

[0003] Concrete pressing cylinders 3a, 3b
The main hydraulic cylinders 5a and 5b are connected to the end on the side opposite to the side wall via the cleaning chamber 4, and the pistons 6a and 6b for pumping are provided inside the cylinders 3a and 3b for pumping concrete.
A hydraulic piston 7 is provided inside the main hydraulic cylinders 5a and 5b.
a and 7b, respectively, and are integrally connected by rods 8a and 8b, respectively.

[0004] The two main hydraulic cylinders 5a and 5b are connected by a connecting hydraulic path 9 in the vicinity of the tip on the cleaning chamber 4 side, and near the tip of the main hydraulic cylinders 5a and 5b on the side opposite to the cleaning chamber, such as a pump. (Not shown) are provided with hydraulic paths 10 for transmitting hydraulic pressure controlled by hydraulic pressure pistons 7a, 7b at predetermined positions of the main hydraulic cylinders 5a, 5b, respectively.
Is provided.

On the other hand, an S-shaped swinging pipe 11 is disposed inside the hopper 1, and one end of the swinging pipe 11 is connected to the hopper 1.
Is rotatably penetrated to communicate with the pressure feed pipe 12,
The other end of the oscillating tube 11 is provided with a valve ring 13 and slidably abuts a valve plate 14 fixed inside the suction / discharge ports 2a, 2b.

The hopper 1 is located at an intermediate position of the swing tube 11.
A connecting shaft 15 rotatably supported on the side wall is connected to the connecting shaft 15 through a connecting plate 16 so as to swing the oscillating tube 11.
17b, and oscillating cylinders 17a, 17b
Have hydraulic pistons 7a, 7 of the main hydraulic cylinders 5a, 5b.
Wiring (not shown) connected to limit switches (not shown) of the main hydraulic cylinders 5a and 5b is provided to correspond to the movement of b.

When the concrete pumping operation is performed by sucking and discharging the concrete C in the hopper 1 by the above concrete pump, the hydraulic pump 10 is provided with hydraulic pumps 7a and 7b through hydraulic paths 10a and 7b.
6b and the connecting hydraulic path 9
The pistons 6a, 6a are alternately moved forward and backward by moving the other pistons 6b, 6a backwards, and at the same time, the limit switches (not shown) confirm that the hydraulic pistons 7a, 7b are at predetermined positions. Upon detection, the oscillating cylinders 17a and 17b are driven, and the oscillating tube 11 is oscillated right and left about the center of the connecting shaft 15 in accordance with the movement of the hydraulic pistons 7a and 7b.

For this reason, when the swinging pipe 11 is located at one of the suction and discharge ports 2a, the pressure-feeding piston 6b of the concrete pressure-feeding cylinder 3b at the other suction and discharge port 2b is retracted to move the inside of the hopper 1. Inhale concrete C
When the swing tube 11 moves to the other suction / discharge port 2b,
Piston 6b for pumping concrete cylinder 3b
Moves forward and discharges the concrete C in the hopper 1, and at the same time, the pump piston 6a of the concrete pump cylinder 3a at one suction / discharge port 2a retreats and the hopper 1
When the oscillating pipe 11 is moved to one of the suction and discharge ports 2a after the concrete C in the inside is sucked, the piston 6a of the concrete feeding cylinder 3a moves forward to move the hopper 1
Discharge concrete C inside.

As described above, the concrete pump repeatedly moves the pistons 6a and 6b forward and backward alternately and oscillates the rocking tube 11 corresponding to the pistons 6a and 6b for pumping. The concrete C discharged from the pistons 6a and 6b is pressure-fed through the swing pipe 11 and the pressure feed pipe 12 by the swing of the swing pipe 11.

[0010]

However, the concrete C sucked and discharged by the pistons 6a and 6b has a different fluidity depending on the composition and the material. There is a gap in the space between the concrete pressure feeding cylinders 3a and 3b at the time of inhalation, which is discontinuous at the time of discharging the concrete C, and there is a problem that it is inconvenient in spraying work or the like. Also, in such a case, stirring was performed manually with a stick or the like, or a stirrer was used. However, in the case of manual power, it was troublesome, and there was a problem in the uniformity of the concrete C and the sustainability of stirring. In the case of a stirrer, it is not sufficient to fill the concrete into the concrete feeding cylinders 3a and 3b, and other members such as the oscillating pipe 11 and the stirring arm are required to insert the compacting vibrator for placing concrete. However, there is a problem that it cannot be arranged properly due to interference.

The present invention has been made in view of such circumstances, and has as its object to be able to continuously discharge concrete regardless of the composition of the concrete.

[0012]

SUMMARY OF THE INVENTION A concrete pump according to the present invention has a rocking pipe in which a concrete pumping cylinder is connected to two suction / discharge ports arranged side by side on a side wall of a hopper, and is slidably disposed in the hopper. The concrete pump cylinder is switched between the suction side and the discharge side by alternately communicating with the two suction and discharge ports by swinging the right and left directions to alternately communicate with the two suction and discharge ports. It is provided with a dynamic pressure generator that gives dynamic pressure.

In the concrete pump of the present invention, the dynamic pressure generator may be provided on the other side wall opposite to the side wall of the hopper provided with the concrete pumping cylinder.

Further, the dynamic pressure generator in the concrete pump according to the present invention comprises a motor having a rotating shaft, an eccentric shaft attached to the rotating shaft, a connecting rod reciprocating by the eccentric shaft, and a hopper by the connecting rod. And a pressing plate for applying dynamic pressure to the concrete inside.

Furthermore, the concrete pump of the present invention
The connection circuit provided between the hydraulic path for driving the concrete pumping cylinder and the dynamic pressure generator may include a calculator for driving the dynamic pressure generator in response to the movement of the piston of the concrete pumping cylinder. .

Therefore, when the concrete in the hopper is sucked and discharged and the concrete is pumped, the dynamic pressure is applied to the concrete by the dynamic pressure generator even if the fluidity of the concrete is low. The concrete can be properly filled without any gaps in the space of the concrete pressure feeding cylinder, and as a result, the concrete can be continuously discharged so as to be used for spraying or the like without relying on human power or a stirring device.

If the dynamic pressure generator is provided on the other side wall opposite to the side wall of the hopper provided with the concrete pumping cylinder, the dynamic pressure of the dynamic pressure generator is directly transmitted to the inside of the concrete pumping cylinder. Concrete can be reliably filled without causing any gaps in the space when the concrete is sucked.

Further, the dynamic pressure generator includes a motor having a rotating shaft, an eccentric shaft attached to the rotating shaft, a connecting rod reciprocating by the eccentric shaft, and a dynamic pressure applied to the concrete in the hopper by the connecting rod. And a pressing plate that provides a simple structure, so that if there is a predetermined installation space on the side surface of the hopper, it can be downsized so that it can be arranged.

Furthermore, a connection circuit provided between a hydraulic path for driving the concrete pumping cylinder and the dynamic pressure generator includes an operation for driving the dynamic pressure generator in accordance with the movement of the piston of the concrete pumping cylinder. With the device, it is possible to drive the dynamic pressure generator in response to the movement of the piston,
It is possible to appropriately cope with the fluidity and the degree of filling of the concrete which affect the inhalation of the concrete. In addition, by changing the setting of the arithmetic unit, it is possible to set concrete to an appropriate condition at the work site.

[0020]

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

FIGS. 1 and 2 show an embodiment of a concrete pump according to the present invention. In the drawings, the same reference numerals as in FIGS. 6 to 8 denote the same parts.

The concrete pump is provided at the lower part of the other side wall so as to face the side wall of the hopper 1 provided with the concrete pumping cylinders 3a and 3b.
There are provided two dynamic pressure generators 18 substantially coincident with each other on the axes a and 3b.

As shown in FIGS. 3 and 4, the dynamic pressure generator 18 has a dynamic pressure generator main body 20 bolted to the side wall of the hopper 1 so as to fit into a through hole 19 provided in a lower portion of the side wall of the hopper 1. A motor 22 is provided behind the dynamic pressure generator main body 20 so that a rotating shaft 21 is located inside the dynamic pressure generator main body 20. The rotating shaft 21 of the motor 22 includes a rotating shaft 21
And an eccentric shaft 23 eccentric in the vertical direction is fitted.
A connecting rod 25 that reciprocates on the axis of the concrete pressure feeding cylinders 3a and 3b via a sliding bearing 24 is fitted to the outside of the cylinder, and a pressing rod 27 is connected to the tip of the connecting rod 25 via a sliding bearing 26. Attached. Further, a rubber plate 28 such as neoprene is provided on the front surface of the pressing rod 27 so as to face the inside of the hopper 1 and seal the inside of the dynamic pressure generator main body 20, and a through hole is formed in the center of the rubber plate 28. To fit the annular spacer 29,
A bolt 30 attached to the pressing rod 27 is inserted into a hole of the spacer 29 of the rubber plate 28, and a pressing plate 31 that faces the inside of the hopper 1 with the rubber plate 28 interposed therebetween is inserted into an end of the bolt 30. Is installed. Further, a sealing plate 32 for sealing the bolted portion is welded to the front surface of the pressing plate 31 to which the bolt 30 is fastened.

The motor 22 of the dynamic pressure generator 18 has a hydraulic path 1 for driving the concrete pumping cylinders 3a and 3b.
A connection circuit 33 is provided so as to interlock with the hydraulic piston 7 of the main hydraulic cylinders 5a and 5b.
a calculator 34 for driving the motor 22 of the dynamic pressure generator 18 in accordance with the movement of the hydraulic pressure generator 10
And a hydraulic pressure detection sensor 35 for converting a hydraulic pressure into a signal is provided between the arithmetic unit 34 and the hydraulic path 10.

Here, as shown in FIG. 5, the pressure of the hydraulic path 10 during the operation of the complete pump is zero before the pressure-feeding pistons 6a, 6b advance and before the pressure-feeding pistons 6a, 6b advance. At the start of pressing, which is the start of forward movement, the pressure increases and then becomes substantially constant, so that the pressure-feeding piston 6
The pressure is reduced to zero at the end of pressing, which is the stop of forward movement of a and 6b. When the concrete C is properly filled in the internal space of the concrete pumping cylinders 3a and 3b, the pressure increases at the same time as the start of the pressing and immediately becomes substantially constant, and the concrete pumping cylinders 3a and 3b. When the concrete space C is not properly filled with the concrete C, the pressure becomes substantially constant after a predetermined time from the start of pressing.

For this reason, the function of the arithmetic unit 34 drives the dynamic pressure generator 18 when the actual measurement time is longer than the reference time T from the start of pressing until the pressure becomes substantially constant, and When the actual measurement time is short, the dynamic pressure generator 18 is set to be stopped. Further, the value of the reference time T can be set according to the degree of filling of the concrete C and the fluidity of the concrete C.

The operation of the embodiment of the present invention will be described below.

When the concrete C in the hopper 1 is sucked into the concrete pumping cylinders 3a, 3b by the pumping pistons 6a, 6b during the concrete pumping operation, the movement of the pistons 6a, 6b and the dynamic pressure generator 1
, The pressure of the hydraulic path 10 is detected by the hydraulic pressure detection sensor 35 as an actual measurement time so that the
Is compared with a reference time T from the start of the pressing of the pressure-feeding pistons 6a and 6b until the pressure becomes substantially constant. Here, the reference time T can be set and changed so as to correspond to various conditions.

In the arithmetic unit 34, the actual measurement time is equal to the reference time T.
If it is longer, a signal for driving the dynamic pressure generator 18 is output, and if it is shorter than the reference time T, a signal for stopping the driving of the dynamic pressure generator 18 is output.

When the dynamic pressure generator 18 is driven by the signal of the arithmetic unit 34, the connecting rod 25 is moved through the eccentric shaft 23 by the rotation of the rotating shaft 21 of the motor 22 inside the dynamic pressure generator main body 20 and the concrete pressure feeding cylinder is driven. 3a, 3
The pressing rod 27 and the pressing plate 31 are reciprocated on the axis of the concrete pressure feeding cylinders 3a and 3b from the reciprocating direction of the connecting rod 25.

For this reason, the pressing plate 31 of the dynamic pressure generator 18
Can apply a dynamic pressure corresponding to the fluidity and the degree of filling of the concrete C to the concrete C in the hopper 1. Here, the drive control of the dynamic pressure generator 18 can change the setting of the frequency, the amplitude, the hydraulic pressure, and the average time for giving the dynamic pressure of the dynamic pressure generator 18.

On the other hand, when the driving of the dynamic pressure generator 18 is stopped by the signal of the arithmetic unit 34, it is possible to prevent the concrete C from being excessively compacted by the dynamic pressure.

Therefore, when the concrete C in the hopper 1 is sucked and discharged to perform the concrete pumping operation, even if the fluidity of the concrete C is low, the dynamic pressure generator 18 applies a dynamic pressure to the concrete C. Concrete pumping cylinder 3 when sucking concrete C
The concrete C can be appropriately filled without gaps in the spaces a and 3b, and as a result, the concrete C can be continuously discharged so as to be used for spraying work or the like without relying on human power or a stirring device.

When the dynamic pressure generator 18 is provided on the other side wall of the hopper 1 provided with the concrete pumping cylinders 3a and 3b, the dynamic pressure of the dynamic pressure generator 18 is directly applied to the concrete pumping. Since the concrete C is transmitted to the inside of the cylinders 3a and 3b, the concrete C can be reliably filled without causing a gap in the space when the concrete C is sucked.

Further, the dynamic pressure generator 18 includes a motor 22 having a rotating shaft 21, an eccentric shaft 23 attached to the rotating shaft 21, a connecting rod 25 reciprocating by the eccentric shaft 23, and a connecting rod 25. And the pressing plate 31 for applying dynamic pressure to the concrete C in the hopper 1, the structure is simple, so that if there is a predetermined installation space on the side surface of the hopper 1, the size can be reduced. be able to.

Further, the cylinder 3 for pressurizing concrete
The connection circuit 33 provided between the hydraulic path 10 for driving the a and 3b and the dynamic pressure generator 18 corresponds to the movement of the pistons 6a and 6b or the hydraulic pistons 7a and 7b of the concrete cylinders 3a and 3b. And dynamic pressure generator 1
8, the dynamic pressure generator 18 can be driven in accordance with the pressure of the hydraulic path 10, that is, the movement of the pressure-feeding pistons 6a, 6b or the hydraulic pistons 7a, 7b. By adjusting the frequency, amplitude, oil pressure, interval which is the average time for applying the dynamic pressure, and the like, the fluidity and the degree of filling of the concrete C which influence the suction of the concrete C can be appropriately handled.
Further, by changing the setting of the arithmetic unit 34, the concrete C can be set to an appropriate condition at the work site.

It should be noted that the concrete pump of the present invention is not limited to the above-described embodiment, and one or three or more dynamic pressure generators may be used instead of two dynamic pressure generators. Instead of providing the generator on the other side wall opposite to the side wall provided with the concrete pumping cylinder, any arrangement may be used as long as the dynamic pressure is applied to the concrete in the hopper. Of course, various changes can be made without departing from the scope.

[0038]

According to the concrete pump of the present invention,
Various excellent effects as described below can be obtained.

(I) When the concrete in the hopper is sucked and discharged and the concrete is pumped, the dynamic pressure is applied to the concrete by the dynamic pressure generator even if the fluidity of the concrete is low. The concrete can be properly filled without gaps in the space of the concrete pumping cylinder, and as a result, the concrete can be continuously discharged for use in spraying work without relying on human power or a stirring device.

(II) When the dynamic pressure generator is provided on the other side wall opposite to the side wall of the hopper provided with the concrete pumping cylinder, the dynamic pressure of the dynamic pressure generator is directly transmitted to the inside of the concrete pumping cylinder. Therefore, it is possible to reliably fill the concrete without forming a gap in the space when the concrete is sucked.

(III) A dynamic pressure generator is provided with a motor having a rotating shaft, an eccentric shaft attached to the rotating shaft, a connecting rod reciprocating with the eccentric shaft, and moving the concrete in the hopper by the connecting rod. If a pressure plate for applying pressure is provided, the hopper can be miniaturized so that it can be arranged if there is a predetermined installation space on the side surface of the hopper since it has a simple structure.

(IV) An operation for driving the dynamic pressure generator in accordance with the movement of the piston of the concrete pressure feeding cylinder in a connection circuit provided between the hydraulic path for driving the concrete pressure feeding cylinder and the dynamic pressure generator. With a container,
Since the dynamic pressure generator can be driven in accordance with the movement of the piston, it is possible to appropriately cope with the fluidity and the degree of filling of the concrete which affect the suction of the concrete. In addition, by changing the setting of the arithmetic unit, it is possible to set concrete to an appropriate condition at the work site.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of a concrete pump of the present invention.

FIG. 2 is a schematic plan view showing a concrete pump of the present invention.

FIG. 3 is a longitudinal sectional side view of a dynamic pressure generator provided in the concrete pump of the present invention.

FIG. 4 is a plan view showing an eccentric shaft of the dynamic pressure generator.

FIG. 5 is a graph showing the relationship between the reference state of time and pressure in a concrete pump.

FIG. 6 is a vertical sectional side view showing a conventional concrete pump.

7 is a view in the direction of arrows VII-VII in FIG. 6;

FIG. 8 is a schematic plan view showing a conventional concrete pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hopper 2a Suction discharge port 2b Suction discharge port 3a Concrete pumping cylinder 3b Concrete pumping cylinder 6a Pumping piston (piston) 6b Pumping piston (piston) 7a Hydraulic piston (piston) 7b Hydraulic piston (piston) 10 Hydraulic path 11 Oscillating tube 18 Dynamic pressure generator 21 Rotary shaft 22 Motor 23 Eccentric shaft 25 Connecting rod 31 Pressing plate 33 Connection circuit 34 Computing unit C Concrete

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H071 AA15 CC11 CC13 CC17 CC33 CC34 CC41 DD72 DD74 DD84 DD89 3H075 AA13 BB03 BB16 BB27 CC01 DA24 DB10 DB47 4G056 CE04

Claims (4)

[Claims] 1. A concrete pumping cylinder is connected to two suction / discharge ports arranged side by side on a side wall of a hopper, and a rocking pipe slidably disposed in the hopper is rocked in the left-right direction to swing the two pipes. In a concrete pump in which a concrete pumping cylinder is switched between a suction side and a discharge side by alternately communicating with a suction and discharge port, a dynamic pressure generator for applying pressure to concrete in the hopper is provided on a side wall of the hopper. A concrete pump characterized by the following. 2. The concrete pump according to claim 1, wherein the dynamic pressure generator is provided on the other side wall of the hopper provided with the concrete pumping cylinder. 3. A dynamic pressure generator comprising: a motor having a rotating shaft; an eccentric shaft attached to the rotating shaft; a connecting rod reciprocating by the eccentric shaft; and a dynamic pressure applied to concrete in a hopper by the connecting rod. The concrete pump according to claim 1, further comprising a pressing plate for providing a pressure. 4. An arithmetic unit for driving a dynamic pressure generator in accordance with a movement of a piston of a concrete pressure feeding cylinder in a connection circuit provided between a hydraulic path for driving a concrete pressure feeding cylinder and a dynamic pressure generator. The concrete pump according to claim 1, comprising: