JPH0518099Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a mortar stirring device.

(Prior art) In order to create foundation piles, the ground is excavated with a boring machine, and then mortar is injected into the excavated hole to create foundation piles in the ground, but the mortar is made of cement. It is manufactured by stirring water, sand, and water at a certain ratio.

Conventionally, as an example of a mortar stirring device, a rotary blade such as a propeller-shaped or waterwheel-shaped blade is arranged in a mortar stirring tank, and the mortar put into the tank is stirred by rotating the rotary blade. be.

(Problem to be solved by the invention) The conventional mortar stirring device described above simply mixes and stirs the mortar, so the area around the rotor blade becomes fluidized, but as it moves away from the rotor blade, the mortar becomes viscous. Due to the high consistency, there is a problem that its fluidization decreases rapidly and, as a result, it takes time to homogenize the entire mortar.

SUMMARY OF THE INVENTION In view of the above conventional problems, an object of the present invention is to provide a mortar stirring device that can homogenize the entire mortar in a short time even if the mortar has a high viscosity.

(Means for Solving the Problems) In order to achieve the above object, the present invention inserts a drive shaft 14 in a suspended manner in a mortar stirring tank 10, and a lower end of the drive shaft 14 has an upper surface 15a having an upwardly convex spherical shape. A configuration is adopted in which a convection generating plate 15 formed in the above-mentioned shape is fixed, and stirring blades 17 are provided protruding from the upper surface of the convection generating plate 15 along the radial direction with respect to the drive shaft 14.

(Embodiment) FIG. 3 is a schematic overall view of a mortar supply device attached to a boring machine for ground excavation, and shows a mortar stirring device 1 which is an embodiment of the present invention, and a mortar produced by the stirring device 1. an agitator 4 with an agitator 3 for temporarily storing mortar 2; a pressure pump 7 for force-feeding the mortar 2 in the agitator 4 to the boring machine via a three-way switching valve 5 and a hose 6;
Water for mortar mixing is supplied into the mortar stirring device 1, and a hose 6 is supplied through the three-way switching valve 5.
It consists of a water tank 8 that supplies cleaning water inside.

As shown in FIGS. 1 and 2, the mortar stirring device 1 includes a cylindrical mortar stirring tank 10 in which a bottom plate portion 10a is inclined in one direction, and a mortar stirring device 1 is fixed to a central portion on an upper lid 11 of the tank 10. It has a drive shaft 14 which is rotatably supported by a gearbox 12 via a bearing 13 and is inserted into the tank 10 in a hanging manner,
A convection generating plate 15 having an upwardly convex spherical upper surface 15a is fixed to the lower end of the drive shaft 14 via a boss portion 16 protruding from the center of the convection generating plate 15. Approximately triangular stirring blades 17 are protruded from the outer peripheral surface of the boss portion 16 at predetermined angles along the radial direction of the drive shaft 14 . Note that 18 is a mortar supply pipe with an on-off valve 19 extending from the outlet of the bottom plate portion 10a of the stirring tank 10 to above the agitator 4, and 20 is a drive for rotating the drive shaft 14 in one direction via bevel gears 21 and 22. It's a motor.

When manufacturing the mortar 2, cement, water, and sand may be put into the stirring tank 10 at a fixed ratio, and the drive shaft 14 may be rotated in one direction. As a result, the centrifugal force caused by the rotation of the stirring blades 17 is transferred to the convection generating plate 15.
It acts horizontally on the mortar above, but the mortar 2 has a high viscosity and the upper surface 15 of the convection generating plate 15
Due to the tendency to stick to a and the weight of the mortar 2 itself, the mortar 2 is pushed downward and outward along the convex spherical upper surface 15a in an arcuate manner. It happens. Then, the mortar 2 pushed downward and outward hits the bottom plate portion 10a of the stirring tank 10, changes its direction upward, and rises along the inner surface of the stirring tank 10. On the other hand, as the mortar 2 on the convection generating plate 15 is pushed out as described above, the mortar 2 above it is pushed out onto the convection generating plate 15.
Since it moves upward, a large convection is generated in the vertical direction in the stirring tank 10, and the entire mortar 2 in the tank 10 is fluidized and homogenized in a short time.

To give an example of specific dimensions, the inner diameter R of the stirring tank 10 is 65 cm, the diameter L of the convection generating plate 15 is 25 cm, its radius r is 30 to 40 cm, its height l is 2.3 to 3 cm, and the height of the stirring blade 17. The height is 8cm.

(Effect of the invention) According to the invention, the upwardly convex spherical upper surface of the convection generating plate allows the mortar on the convection generating plate to be moved by using the centrifugal force caused by the rotation of the stirring blade, the viscosity of the mortar, its own weight, etc. , by pushing the mortar downward and outward, thereby creating convection throughout the mortar in the stirring tank, promoting its fluidization, and even if the mortar has a high viscosity, it can be stirred homogeneously in a short time. It is something that can be done.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a mortar stirring device which is an embodiment of the present invention, Fig. 2 is a view taken in the direction of - arrow in Fig. 1,
FIG. 3 is a schematic side view of a mortar supply device in which the mortar stirring device described above is installed. 1...Mortar stirring device, 2...Mortar, 1
0... Mortar stirring tank, 14... Drive shaft, 15...
...Convection generating plate, 15a...Top surface of convection generating plate, 1
7... Stirring blade.

Claims (1)

[Scope of utility model registration request] A drive shaft is inserted into the mortar stirring tank, and a convection generating plate having an upwardly convex spherical upper surface is fixed to the lower end of the drive shaft, and a convection generating plate is attached to the upper surface of the convection generating plate in a radial direction with respect to the drive shaft. A mortar stirring device with stirring blades protruding along the side.