JPS6233109Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a concrete pump used for pumping fresh concrete.

For example, as shown in Fig. 6, the concrete pump includes a hopper H into which fresh concrete is poured;
The front wall F of the hopper H has a suction/exhaust port connected thereto, and two concrete cylinders C, C are operated in opposite phases to each other, and the concrete cylinders C, C
In synchronization with the operation of the concrete cylinders C and C on the discharging side, the suction ports P are swung, and the oscillating pipe S, which pumps fresh concrete to the transport pipe E side connected to the rear wall B, and the oscillating pipe S are oscillated. It is suspended horizontally on the upper side of the arterial pipe S,
There is a type that has a stirring shaft K to which a stirring blade G for stirring the fresh concrete in the hopper H is attached, and a swinging tube S moves within the hopper H to switch the flow path within the hopper H. In this type of concrete pump, the hopper H is influenced by the high pressure of fresh concrete N in the swing tube S, and the front wall F and rear wall B are pushed open in the front and back direction of the hopper, and the concrete cylinders C, C There is a risk that the suction port P of the swing tube S may become separated from the suction port P of the swing tube S. Therefore, as a means to suppress this, it is common to provide a reinforcing rod R between the front wall F and the rear wall B, that is, in a direction parallel to the pumping direction of fresh concrete.

However, since the reinforcing rod R is located within the hopper H, it becomes an obstacle to the flow of fresh concrete within the hopper. Therefore, the reinforcing rod R has a disadvantage in that it prevents the fresh concrete from being sucked into the suction and discharge ports of the concrete cylinders C, C, and reduces the pumping efficiency of the concrete pump.

This idea was created in view of the above points. In other words, this idea is to sufficiently reinforce the hopper in the direction of pumping the fresh concrete, and to remove as many obstructions to the flow inside the hopper as possible so that the fresh concrete can be sucked into the hopper. The purpose of this invention is to provide a concrete pump that can reliably and smoothly perform the following steps.

Therefore, in order to achieve this purpose, the concrete pump of this invention includes a swinging tube that swings within the hopper to switch the flow path within the hopper, and a swinging tube that swings within the hopper in a direction parallel to the pumping direction of fresh concrete. In a concrete pump equipped with a reinforcing rod for the hopper attached to the hopper, and a stirring blade for stirring the hopper, the reinforcing rod is attached to a central axis fixed between the opposing walls of the hopper, and an outer cylindrical tube that is rotatably supported by the hopper and has the stirring blade attached to its outer periphery, and the outer cylindrical tube is led out through an insertion hole provided on the opposite wall surface of the hopper. At the same time, its lead-out end is rotatably supported, and both ends of the central shaft protrude from the ends of the outer cylindrical tube, so that the protruding ends are connected to the opposite wall surface of the hopper. It is characterized by being fixed to a retainer individually installed on the outer wall.

This invention will be explained below with reference to embodiments shown in FIGS. 1 to 4.

In the figure, 1 indicates a hopper, which includes a front wall 1a, left and right side walls 1b, 1b, a rear wall 1c, and a bottom plate 2.
It forms a box shape surrounded by. At the lower part of this front wall 1a, two concrete cylinders 3 and 4 each having a piston P inserted into its inner hole are installed in parallel, and these concrete cylinders 3,
The suction/discharge ports 5, 6 of No. 4 are connected to a liner 7 attached to the inner surface of the front wall 1a. The pistons P, P are reciprocated in opposite phases to each other by a driving means (not shown).

Further, an operating shaft 9 of a swing tube 13, which will be described later, is horizontally supported by a bearing 8 provided at the center of the front wall 1a.
It is connected via an operating lever 12 to a piston rod of a drive cylinder 11 mounted on the outer surface of the cylinder a.

Next, the hopper 1 is swung at the bottom of the hopper 1.
The swing tube 13 that switches the flow path inside will be explained. The swing tube 13 has a substantially S-shape with an eccentric center portion, and the rear discharge port 14 is rotatably connected to a transport pipe 15 connected to the rear wall 1c. Front suction port 16 which is the moving end
are connected to the intake and exhaust ports 5 and 6 of the concrete cylinders 3 and 4. The operating shaft 9 is fixed to the rear part of the swing tube 13.

Thus, the suction port 16 of the swing pipe 13 is swung in an arcuate trajectory about the operating shaft 9 as the center of rotation due to the expansion and contraction operation of the driving cylinder 11, and the suction port 16 of the concrete cylinder 3, 4 on the discharging side is swung in an arcuate trajectory. , 6 alternately.

Next, the reinforcing rod 17 of the hopper 1 will be explained.
The reinforcing rods 17 are installed at two places on the upper left and right sides of the swing tube 13, and are attached to a central shaft horizontally suspended between one and the other retainers 18 and 19 provided on the front wall 1a and the rear wall 1c. 20, and an outer cylindrical tube 21 that is inserted over the central shaft 20. The center shaft 20 has both ends connected to the retainers 18 and 1.
Attach the nuts 22, 23 to the mounting outer plates 18a, 19a of 9.
The front wall 1a and the rear wall 1c are provided in a direction that prevents the front wall 1a and the rear wall 1c from being pushed open in the front-rear direction of the hopper 1, that is, in a direction parallel to the pumping direction of fresh concrete. On the other hand, the axial length of the outer cylindrical tube 21 is shorter than the axial length of the central shaft 20, and the inner diameter of the outer cylindrical tube 21 is larger than the outer diameter of the central shaft 20. The both ends of the radial bearings 24 mounted on the retainers 18 and 19,
25, and one retainer 1
A sprocket 26 is attached to one end of the outer cylindrical tube 21 located in the inner space 18b of the hopper 8, and stirring blades 27 for stirring the inside of the hopper 1 are arranged radially around the outer periphery of the outer cylindrical tube 21. Multiple pieces are installed.

Furthermore, the sprockets 26, 26 of the two sets of reinforcing rods 17, 17 are interlocked and connected via chains 29, 29 to a drive motor 28 mounted on the outer surface of the front wall 1a. Note that the radial bearings 24, 2
5 and the through holes 30 and 31 provided in the front wall 1a and the rear wall 1c, respectively, sealing materials 32, 33 are provided.

Thus, the stirring blade 27 is configured to rotate about the central axis 20 of the reinforcing rod 17 as the center of rotation.

Next, the operation of the above configuration will be explained.

First, the concrete cylinders 3 and 4, the drive cylinder 11, and the drive motor 28 are operated to charge fresh concrete into the hopper 1. The poured fresh concrete is stirred by a plurality of stirring blades 27 rotated by a drive motor 28, and the aggregate, mortar, and moisture are sufficiently mixed. The sufficiently mixed ready-mixed concrete is sucked into the concrete cylinders 3 and 4 on the suction operation side, and is sequentially pressure-fed from the concrete cylinders 3 and 4, which have switched to the discharge operation, to the transport pipe 15 via the swing pipe, and is sent to the pouring site. is supplied to

At this time, the high pressure of the fresh concrete in the swinging tube 13 is applied to the liner 7 and the front wall 1a during the swinging of the swinging tube 13, and the front wall 1a and the rear wall 1c of the hopper 1 are
Try to push open the hopper 1 in the front and back direction. However, the central axis 20 of the reinforcing rod 17, which is provided in a direction parallel to the pumping direction of fresh concrete, resists the tensile force applied to the central axis 20 and suppresses deformation of the hopper 1. Therefore, the concrete cylinder 3,
4 and the suction port 16 of the swing pipe 13 are never separated from each other, and the efficiency of the fresh concrete suction operation is maintained constant. In addition, the number of obstacles that obstruct the flow of fresh concrete in the hopper 1 can be minimized, and the fresh concrete in the hopper 1 is not only sufficiently stirred and mixed by the stirring blades 27, but also at the suction and discharge ports of the concrete cylinders 3 and 4. 5,6
The suction can be carried out smoothly and reliably.

Next, a second embodiment of this invention will be explained with reference to FIG.

In the second embodiment, reinforcing rods 217 similar to those in the first embodiment are attached to one and the other retainers 218, 21.
It is suspended horizontally between 9 rooms. A connecting lever 240 is attached to the outer cylindrical tube 221 of the reinforcing rod 217 at the end on the one retainer 218 side, and this connecting lever 240 is connected to the drive cylinder of the swing tube 13. Therefore, when the drive cylinder for switching the swing tube is telescopically operated, the connecting lever 240
The stirring blade 227 is oscillated about the central shaft 220 via the stirring blade 227 .

As explained above, according to this invention, the central axis of the reinforcing rod is fixed between the opposing wall surfaces of the hopper in a direction parallel to the pumping direction of fresh concrete, and stirring blades are attached to the outer periphery of this central axis. Since the attached outer cylindrical pipe is rotatably externally inserted and pivoted, the hopper is sufficiently reinforced by the fixed central axis in the direction of pumping the fresh concrete, and can be said to expand and contract in the direction of pumping. In addition, since the outer cylindrical tube to which the stirring blades are attached is extrapolated to the above-mentioned central axis, the installation of the above-mentioned central axis and outer cylindrical tube is extremely compact and becomes an obstacle to the flow of fresh concrete in the hopper. Never.

Therefore, there is an effect that the efficiency of sucking and pumping fresh concrete can be increased.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the concrete pump according to this invention, and FIG. 2 is a front view of the concrete pump taken along the - line in FIG.
Fig. 3 is a sectional view of the concrete pump along the - line in Fig. 1, Fig. 4 is an enlarged sectional view showing the hopper reinforcing rod of the concrete pump, and Fig. 5 is a second embodiment of the invention. An enlarged cross-sectional view showing the reinforcing rod of the hopper of a concrete pump,
FIG. 6 is a side sectional view of a conventional concrete pump. 1... Hopper, 3, 4... Concrete cylinder, 13... Swing pipe, 17, 217... Reinforcement rod,
18, 19, 218, 219...retainer, 2
0,220... Central shaft, 21,221... Outer tube, 27,227... Stirring blade.

Claims (1)

[Scope of Claim for Utility Model Registration] A swinging tube that swings within the hopper to switch the flow path within the hopper, a reinforcing rod for the hopper that is installed within the hopper in a direction parallel to the pumping direction of ready-mixed concrete, In a concrete pump equipped with stirring blades for stirring a hopper, the reinforcing rod has a central shaft fixed between opposing wall surfaces of the hopper, and an outer circumferential portion that is supported on the central shaft so as to be rotatably driven. and an outer cylindrical tube to which the stirring blade is attached, and the outer cylindrical tube is led out through a through hole provided on the opposite wall surface of the hopper, and the leading end thereof is rotatably driven. The central shaft is rotatably supported, and both ends of the central shaft protrude from the ends of the outer cylindrical tube, and both of the protruding ends are fixed to retainers individually provided on the outer wall of the opposite wall of the hopper. A concrete pump characterized by: