JPS6235906Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a concrete pump used mainly at civil engineering works sites such as dam construction work.

At the site of concrete pouring work, a stationary concrete pump or a concrete pump truck is installed. Fresh concrete is transported to the site by mixer trucks, etc., and after being put into the pump hopper, it is pumped by the operation of the concrete pump. Usually, concrete is pumped to the pouring site via a transport pipe, and the basic structure and operation of concrete pumps are the same whether they are stationary or vehicle-mounted.

Furthermore, the general structure of concrete pumps (hereinafter simply referred to as pumps) is that the pump is installed at the bottom of the hopper 1, such as the horizontal type pump shown in Fig. 1 or the diagonal horizontal type pump shown in Fig. 2. unit 2
The pump unit 2 has two cylinder devices (a hydraulic cylinder device 3 for actuating the concrete piston and a concrete feeding cylinder device 4 integrally formed on the same axis). (Only one is shown in the diagram) They are connected in parallel to the switching valve device V, and fresh concrete is sucked into the cylinder 4 from the opening at the bottom of the hopper 1, and at the same time the piston slides to the right in the diagram, which is the discharge stroke. (FIG. 1b), the ready-mixed concrete in the cylinder 4 is configured to be discharged into a pressure feed pipe 5 attached to the opposite side of the pump unit 2.

By the way, in the operation of the conventional pump configured as described above, since the unit 2 is placed horizontally or diagonally horizontally, the fresh concrete from the hopper 1 is sucked sideways or diagonally upward. As a result, the flow of fresh concrete at the bent portion of the suction flow path deteriorates, and especially when fresh concrete with poor fluidity is used, there is a drawback that suction failure of the pump occurs.

In pouring work such as dam construction, civil engineering grade fresh concrete with a poor mix is used, and the fluidity of the fresh concrete is poor.As a result, the above drawbacks become fatal, making it difficult to use pumps, and the current situation is In dam construction projects, inefficient cable cranes are often used to transport fresh concrete.

The reason why the pump unit is placed horizontally in conventional pump structures is that if the unit is placed vertically, the hopper will be located higher, making it difficult to pour fresh concrete from the concrete mixer truck into the hopper. In addition, especially with on-vehicle pumps, this is due to reasons such as the vehicle height of the pump truck exceeding the regulatory value, due to the convenience of mounting it on a truck. In the case of pump trucks, it is easy to install scaffolding to allow mixer trucks to enter, so the above reason is weak.In addition, in the case of pump trucks, it is possible to comply with vehicle height regulations by storing them horizontally when driving. The reasons given above are weak since they can be adapted.

The present invention was developed from this perspective, and the purpose of the present invention is to provide a system that has good suction performance even for poorly mixed ready-mixed concrete, and that maintenance work such as cleaning and maintenance of the pump is easy. Our goal is to provide concrete pumps that are of the highest quality.

Hereinafter, the present invention will be explained based on an illustrated embodiment.

As shown in FIGS. 3 to 5, the pump 6 of the embodiment is installed directly under a hopper 8 that is cantilevered to a gate-shaped support 7 erected on the ground. The cage, that is, the mortar-shaped hopper 8 is
Upper and lower two platform-like frames 9, 1
0, and the pump 6 is held on a block-shaped stand 12 suspended horizontally between left and right thick plate bearings 11, and the stand 12 can swing around its ear shaft 12a. be.

Thus, each bearing 11 is erected on the ground by one pillar 13 and two side pillars 14, and also has a pair of parallel pump cylinder units 20A, 20A forming the pump 6. 20B is fixed to the stand 12 at an intermediate portion between the hydraulic cylinder 21 of each unit 20A, 20B and the fresh concrete feeding cylinder 22.

In addition, on the right side of the support column 7 in the drawing, a scaffold 15 for boarding the mixer truck M is constructed on a rising board, and under the scaffold 15, a hydraulic power unit 16 is installed.
In addition, a hook 17 used for hoisting a valve (described later) is attached to the overhanging arm at the top of the column 7, and both frames 9 and 10 along the column 7 are attached. In between, there is a cleaning water tank 1.
8 is installed, and a water supply hose 19 attached to the tank 18 is led to the stand 12 and communicates with the inside of the feeding cylinder 22 on the back side of the concrete feeding piston 27.

Next, in the center of the bottom plate of the hopper 8, which is at the same height as the top surface of the frame 10, a rotating valve 23 having a substantially truncated conical shape is vertically supported with a rotating shaft 24 fixed at its center. bubble 23
A discharge passage 23a that exits from one eccentric position on the bottom surface to the top, and a suction passage 23b that exits from a symmetrical position on the bottom surface to the side surface are bored inside.

Therefore, when the pump cylinder units 20A and 20B are placed in the vertical operating position by operating the base 12, one of the feeding cylinders 22 is moved as shown in FIGS. 4 and 6. The upper surface opening communicates with one of the passages 23a or 23b, and the opening of the other feeding cylinder 22 communicates with the other passage located at a symmetrical position.

Further, the rotating shaft 24 is driven by a drive mechanism (not shown) and is configured to rotate intermittently in synchronization with the operation of the hydraulic cylinder 21.

Next, the pressure feed pipe 25 connected to the upper end opening of the discharge passage 23a of the valve 23 is guided to near the ground beside the pump 6, and then its tip is connected to the feed pipe 26 leading to the concrete placement location. has been done.

When the pump 6 configured in this way is operated,
The ready-mixed concrete poured from the mixer truck M that ran aground on the scaffolding 15 is stored in the hopper 8, and if the pump 6 is started when necessary,
The pair of hydraulic cylinders 21 have a power unit 1 which moves alternately through suction and discharge strokes.
6, the valve 23 is intermittently driven by half a rotation in synchronization with the switching of the stroke movement, and as a result, the unit 20
In the state shown in FIG. 4 in which the concrete feeding piston 27 of A is raised, fresh concrete is fed under pressure from the feeding cylinder 22 of the unit 20A to the pressure feeding pipe 25, and in the rotational position of the valve 23 shown in FIG. , the ready-mixed concrete is fed under pressure from the unit 20B, and thereby the ready-mixed concrete is continuously fed under pressure into the feed pipe 26.

However, while the feed cylinder 22 is operating, gravity is applied from the hopper 8 in the same direction as the fresh concrete suction direction, so the influence of gravity is evenly distributed on the flow of the fresh concrete. As a result, suction from the hopper 8 is performed well during the suction stroke where the acting force is weak, and there is no risk of poor suction even in the case of poorly mixed concrete.

After the operation of the pump 6 is finished, the pump cylinder unit 20 is
20A, 20B are tilted so that the feed cylinder 22 faces downward, and then the washing hose is appropriately fed from the cylinder 22
By discharging water into the inner holes of both cylinders 22, the ready-mixed concrete adhering to the inside of both cylinders 22 can be easily washed away.

In addition, when servicing pump 6, unit 2
If 0A and 20B are also tilted, maintenance work such as inspection and replacement of the concrete feeding piston 27 is easy.

Here, the embodiment described above is an example in which the technology according to the present invention is applied to a stationary pump, but when applied to a pump truck, a pump of the same structure may be mounted on the loading platform of the traveling vehicle, In that case, the pump unit can be stored horizontally when traveling, and after driving the pump truck near the scaffolding at the construction site, the pump unit can be set upright to put the pump into operation.

As is clear from the structure and operation of the embodiment described above, the pump of the embodiment has the following advantages.

(a) Since the pump cylinder unit is located directly below the hopper, the efficiency of sucking fresh concrete is extremely high.

(b) Since the rotary valve 23 can be lifted up for maintenance,
Valve maintenance is easy.

(c) By tilting the pump cylinder units 20A and 20B, the bottom surface of the hopper 8 is opened, making it easy to clean the hopper.

(d) By building the scaffolding 15 at a high height, even if the model of the mixer truck changes, the loading work is easy.

(e) Since the fresh concrete suction port is located at the bottom of the hopper, there is no risk of air being sucked in when the feeding cylinder 22 operates to suck in fresh concrete, and fresh concrete can be pumped without remaining.

As described above, according to the concrete pump of the present invention, the substantially truncated conical rotary valve 23 is provided at the inner bottom of the hopper 8 so as to be able to reciprocate with the center axis of rotation in the vertical direction. The upper end openings of a pair of vertical feeding cylinders 22, 22 for sucking and discharging fresh concrete are connected to the bottom part, and the upper end opening of one of the feeding cylinders is connected to the flat bottom surface of the lower end from the side surface of the rotary valve 23. Ready-mixed concrete is supplied from inside the hopper through a suction passage 23b provided across the cylinder, and fresh concrete is supplied from the upper end opening of the other feeding cylinder through a discharge passage 23a provided from the flat bottom of the rotary valve 23 to the top of the upper end. ,
Since the ready-mixed concrete is forced to be fed to the pressure-feeding pipe 25 connected to the top of the rotary valve 23, the suction path and the discharge path of the ready-mixed concrete are connected to the pair of feeding cylinders 22, 22, both of which are set vertically. The suction passage 23b and the discharge passage 23a are formed compactly in the generally vertical direction approximately along the vertical rotation center axis of the single substantially truncated conical rotary valve from the upper end opening. The suction and discharge channels as a whole are vertical along the gravity of the fresh concrete, and the bending of the fresh concrete suction and discharge channels and the gravity of the ready-mixed concrete in the direction of the suction and discharge channels, as in the conventional case. By eliminating the decrease in inhalation and exhalation operation caused by
Even when pumping fresh concrete with poor fluidity, efficient suction and discharge operations can be achieved.

Furthermore, a pump cylinder for pumping fresh concrete with this type of piston has a considerably long axial length, so the conventional type of concrete pump described above requires a large horizontal installation space. ,Since the present invention requires only a narrow horizontal installation space, it has great practical effects, such as improved installation and usability.In particular,
The effect is remarkable when constructing large-scale civil engineering works.

[Brief explanation of the drawing]

Fig. 1 is a front view of a basic concrete pump, in which Fig. a shows the flow during suction operation, Fig. b shows the flow during discharge operation;
Figure 2 is a front view of the same pump with a different shape;
4 is a partially enlarged view of FIG. 3, FIG. 5 is a side view of FIG. 4, and FIG. 6 is a front view of a concrete pump showing an embodiment of the present invention. FIG. 6...Pump, 8...Hopper, 20A, 20B
...Cylinder unit, 22...Feeding cylinder,
25...Pressure pipe.

Claims (1)

[Scope of utility model registration request] A concrete pump in which a pump cylinder unit is connected to the outer bottom of the hopper and operates to suck in fresh concrete in the hopper or discharge the sucked fresh concrete into a pressure feed pipe by alternately reciprocating pistons in a pair of cylinders, The inner bottom of the hopper has a substantially truncated conical shape with the center axis of rotation in the vertical direction and the bottom surface of the lower end as a flat surface. A rotary valve 23 having a discharge passage 23a connected to the pressure pipe 25 connected to the top and an intake passage 23b opening into the hopper from a symmetrical part of the bottom surface to the side surface and opening into the hopper is rotated in a reciprocating manner. The pump cylinder unit is movably provided, and the upper end openings of the pair of cylinders are selectively connected to the bottom openings of the discharge passage 23a and suction passage 23b of the rotary valve 23, which are opened at the bottom of the hopper. 1. A concrete pump characterized in that the concrete pump is disposed directly below the bottom of the hopper with the axis of the cylinder extending in a substantially vertical longitudinal direction.