JPS58163614A - Method of operating concrete mixer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of operating a concrete mixer for performing the functions of a mortar mixer and a concrete mixer, which were conventionally considered to be different types of mixers, in one mixer.

Conventionally, mortar mixers and concrete mixers were considered to be different types of mixers. This is a mortar mixer that mixes cement, water, and sand at high speed.
This is because the concrete mixer inputs gravel and mixes it at low speed, and the rotation speed of each mixer is different.

Therefore, conventionally, separate mixers have been used, such as a mortar mixer for mortar and a concrete mixer for concrete.

The present invention attempts to perform both the functions of a mortar mixer and a concrete mixer with a single mixer, and by making it possible to automatically change the speed of the mixer's rotation, the number of revolutions is 1 during mortar mixing and after gravel is added. is automatically controlled.

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

1 and 2 show a two-shaft forced kneading mixer as an example of a mixer for carrying out the method of the present invention.

The two-shaft forced kneading mixer has two rotating shafts (2) (3) arranged in parallel in the mixing tank (1), and both ends of each shaft (2) (3) are connected to the mixing tank (1) by bearings ( At the same time, the mixing tool (5) is attached to each shaft (2) (3) so as not to interfere with each other, and the power of the kneading motor (6) is transmitted to the transmission mechanism (
7) to the rotating shafts (2) and (3),
The mixing tool (5) is rotated so that the mortar or gravel in the mixing tank (υ) is mixed.

In the method of the present invention, the motor (6) rotates the rotating shaft (2).
(3) The number of revolutions at which the gravel is rotated is variably controlled, so that it is rotated at high speed when mortar is mixed, and automatically rotated at low speed after gravel is added, so that it can be used properly.

As a method of changing the speed, a pole number changing motor, a variable speed motor, etc. are used for the kneading motor (6), and the rotation speed is changed in stages according to the time for introducing the coarse aggregate into the mixing tank (1). . That is, the mixer is operated at high speed from the time of discharging the material to just before the gravel is input, and is operated at low speed from immediately before the gravel is input until a certain period of time after the input is completed.

The above operation control is performed by circuits as shown in FIGS. 3 and 4. Figure 5 shows the power circuit. When the low-speed side electromagnetic contact piece (8) closes, the motor coil (MC) connection terminal (
Ut ) (Uz ), (Vt) (Vt), (%) (W
3) is energized to perform low-speed rotation, and when the high-speed side electromagnetic contact piece (9) closes, the connection terminals (Uz), (V2), (%) of the motor coil (MC) High speed rotation will be performed. Figure 4 shows the control circuit, where (g) is the stop push button, al) is the high speed side push button, (b) is the low speed side push button, The high-speed side and low-speed side push buttons aυ (2) are always open, and the stop push button (G) is always closed. Q3 (141 (G) is an auxiliary electromagnetic contact piece, (G) αUS is an electromagnetic contactor coil, and α (e) is an overcurrent relay piece.By pressing the pushbuttons aυ and (b) in accordance with the time when the coarse layer material is introduced, the motor is rotated by energizing each circuit. The number can be automatically controlled from fast to slow or vice versa.

Note that the method of the present invention is not only applicable to the two-axis forced mixing mixer as shown in FIGS. Applicable to various concrete mixers.

As described above, according to the method of operating a concrete mixer of the present invention, one mixer can be used for high-speed and low-speed mixing, and when mortar mixes, high-speed rotation and low-speed rotation can be used.
After the gravel is added, it is rotated at a low speed, making it possible to knead high-quality mortar faster and shorten the overall cycle time.

[Brief explanation of drawings]

FIG. 1 shows a computer to which the method of the present invention is applied. - A perspective view of an example of a two-shaft forced kneading mixer, FIG. 2 is a cutaway plan view of FIG. 1, and FIGS. 3 and 4 are circuit diagrams of the method of the present invention. (1)...Mixing tank, (2) (3)...Rotating shaft, (
5)...Mixing tool, (6)...Kneading motor. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd. Patent applicant Ishikawajima Construction Machinery Co., Ltd. Patent applicant agent

Claims (1)

[Claims] 1) A method of operating a concrete mixer, which is characterized in that the rotation speed of one concrete mixer is variable, the mortar mixer is operated at high speed, and after gravel is added, the rotation speed is reduced to low speed.