JPS6153471A - Concrete pump - Google Patents

Abstract

PURPOSE:To simplify a flow passage for fresh concrete in terms of structure as well as to prevent it from clogging, by installing a valve pipe consisting of a straight pipe rockably inside a hopper, while making each opening at both ends of the valve pipe detachable to each one end of a discharge pipe opened to both walls of the hopper and a piston pump. CONSTITUTION:A valve pipe 3 is hangingly supported on bearings 10 and 11 leading to a hopper 4 extending over between a discharge pipe 1 and a piston pump 2 and rockably installed in the side between lining plates 8 and 9 attached to front and rear walls of the hopper 4. And, the valve pipe 3 is situated at the discharge pipe 1 side and the piston pump 2 side at both ends of a straight pipe 12 and installs support plates 13 and 14, while each fulcrum shaft 15 is installed in each of these support plates 13 and 14, and it is made up into a crank form. In addition, a hydraulic cylinder 17 is connected to one side fulcrum shaft 15 whereby the valve pipe 3 is rocked by drive motion of this hydraulic cylinder 17. With this constitution, the valve pipe 3 is selectively positioned in either of an interconnecting state that both ends are butted to each one end of the discharge pipe 1 and the piston pump 2 or a freedom state that both ends are opened to the inside of the hopper 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a concrete pump for pumping fJIj-fed fresh concrete to a construction site.

There are two types of concrete pumps: piston pump type and extruded tube type. Of these, hydraulic piston pumps are widely used because of their high pressure and high head.

Conventional technology A piston pump type concrete pump is equipped with a piston pump that passes through a hopper containing supplied ready-mixed concrete and is connected to a discharge pipe, and a switching valve that opens and closes in conjunction with the piston pump is installed inside the hopper. ing.

This switching valve is usually a 7-lap valve and has a separate valve passage, which has the disadvantage of complicating the passage of fresh concrete and increasing passage resistance.

Problems to be Solved by the Invention In contrast, the present invention solves the above-mentioned drawbacks by forming the switching valve into a valve pipe consisting of one straight pipe, so that the ready-mixed concrete is directly conveyed from the piston pump to the discharge pipe. (1v) In addition to removing the valve pipe, adjustment work for valve pipe wear can be performed extremely easily.

Means for Solving the Problems An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. hopper 4 provided with
The piston pump is formed by arranging a pressure oil supply pump 5, an engine 6, and an oil tank 7, which are hydraulic systems for operating the piston pump 2 and valve pipe 3, and pumps the fresh concrete supplied to the hopper 4. 2 from the discharge pipe 1 to the desired location in a pulsating manner.

FIG. 2 is a side cross-sectional view showing the inside of the hopper 4, with lining plates 8,
9, the valve pipe 3 extends between the discharge pipe 1 and the piston pump 2.
is suspended from bearings 10°11 connected to the hopper 4 so as to be able to move laterally.

This valve pipe 3 consists of one straight pipe 12, as shown in FIG.
Support plates 13.14 are provided at both ends of the straight pipe and located on the discharge pipe side and the piston pump side, and support plates 13.14 are provided on these supports F113.14 to form a crank shape. There is. Of these support plates, the support plate 13 on the discharge pipe side is made wide in the form of a triangular plate that protrudes to one side as shown in Figure (C). The shaft 15 is simply narrow, and
As is clear from FIG. 1(A), an arm rod 16 for moving the valve pipe 3 is attached.

The valve pipe 3 is installed in the hopper 4 by inserting the support shafts 15 and 15 through the bearings 10 and 11, and connects the arm rod 16 to a hydraulic cylinder 17 provided outside the hopper 4, as shown in FIG.
As shown in Fig. 5, it is provided in the swingable 11th
As shown in the figure, a mouthpiece 18 is attached to one end of the straight pipe 12 on the piston pump side, and a short pipe 19 is fitted into the hopper 4 at the part that contacts the discharge pipe side support plate 13. By moving the discharge pipe 1 to the right in the drawing by means of a feeding lever 20, the pipe 19 moves together with the discharge pipe 1 so that the degree of protrusion relative to the support plate 13 can be adjusted. In other words, the valve pipe 3 needs to move little by little toward the piston pump due to wear of the mouthpiece 18, so the support plate 14 on one side of the valve pipe 3 and its support shaft 15 go up the spline and rotate. II is also connected via the adjusting cylinder 21 which is engaged to prevent this. This movement is achieved by rotating the feed lever 22 screwed into the support shaft 15 by opening the adjustment cylinder 21, allowing only the valve pipe 3 to move to the left or right in the figure without changing the position of the support shaft 15. can be moved to

Now, the valve pipe 3 is swung by the hydraulic cylinder 17, and its both ends are brought into contact with one end of the discharge pipe 1 and the piston pump 2, respectively, as shown in FIG. ), the Yamada state in which both ends are open into the hopper 4 is repeated, but since the support plate 13 on the discharge pipe side is triangular in shape and protrudes to the − side as described above, In the case of B), the support plate 13 is as shown in FIG.
), the fresh concrete in the hopper 4 polymerizes at the opening of the discharge pipe 1, that is, at one end of the short pipe 19, and blocks the flow of concrete into the discharge pipe 1. is sucked into the piston pump 2 and is not discharged from the discharge pipe 1.

Effects of the invention Thus, the swinging of the valve pipe 3 by the hydraulic sill-17,
The piston pump 2, which performs suction and extrusion in conjunction with this, 1) The ready-mixed concrete in the ramper 4 is pumped 3J through the discharge pipe 1 to the gushing area. Compared to the previous model, a separate valve path was not provided, and the valve path was formed by freely connecting a straight pipe between the piston pump and the discharge pipe, which prevented clogging with fresh concrete and made adjustments easy. It has many advantages such as:

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an explanatory plan view of the whole, FIG. 2 is a sectional side view of the main part, FIG. 3 is a slope view of the valve pipe, and FIG. (B) (C) is a plan view when fresh concrete is being pumped, a front view of the support plate on the piston pump side, and a back view of the support plate on the discharge pipe side. Figure 5 is a plan view when fresh concrete is being sucked in, and a support plate on the piston pump side. FIG. 2 is a front view and a rear view of a discharge pipe side support plate.

Claims (1)

[Claims] Inside the hopper, which has a discharge pipe and a piston pump protruding from the front and back sides, there is a separate support plate at both ends of the straight pipe, and this support plate is pivotally supported on the hopper so that it can swing freely. In addition, a valve pipe is provided to alternately connect the piston pumps to each other and close the discharge pipe by one of the support plates, and the discharge pipe is equipped with a feed screw for adjusting the wear of the valve pipe, and an optional screw on the support plate. A concrete pump consisting of a support shaft connected to a hydraulic cylinder and an adjustment tube that is prevented from rotating and only allows sliding, on one side.