JPH0970815A - Cement weighing hopper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a time for kneading cement, an admixture, and other materials in a mixer by mixing the cement and the admixture uniformly before feeding them into the mixer. SOLUTION: A horizontal shaft 25 having a screw-shaped mixing-agitating paddle 27 in which one side from the middle is formed in the right-handed screw direction and the other side from the middle is formed in the left-handed screw direction is rotated in a cement weighing hopper main body 23, the batching of cement is started in this state in a cement weighing part 9, and the cement is supplied into the hopper main body 23. When the quantity of the cement supplied reaches a preset cement blending weight value, the batching of the cement is completed, and the batching of an admixture which is added by an admixture weighing part 10 is started. A powder mixer having the paddle 27 is operated, the admixture is dispersed uniformly into the cement, the mixture is fed into a mixer to be kneaded with other materials.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement weighing hopper used for mixing when gravel, sand, cement, admixture, water, admixture, etc. are kneaded to produce ready-mixed concrete.

[0002]

2. Description of the Related Art Conventionally, in a ready-mixed concrete manufacturing plant, cement, an admixture and another material are kneaded in the following manner. (1) Cement is supplied to the cement weighing hopper, admixture is supplied to the admixture weighing hopper, and the cement and the admixture are adjusted to have a predetermined blended weighing value by the cement weighing hopper and the admixture weighing hopper. Weigh individually and after the measurement is completed,
Cement and admixture are introduced into the mixer with a slight time difference through a charging chute provided below the cement weighing hopper and each charging chute provided below the admixture measuring hopper, and the cement and the admixture are mixed with the mixer. Knead with other ingredients. (2) Cement is supplied to one weighing hopper and weighed so as to have a predetermined blending weighing value, and then the admixture is fed to the same weighing hopper in a state of being overlaid on the cement in the hopper to obtain a predetermined blending amount. After the addition is completed, the cement is added to the mixer through the charging chute provided under the measuring hopper, and then the admixture is charged into the mixer through the charging chute. Knead cement, admixture and other materials.

[0003]

In recent years, demand for ready-mixed concrete requires high-quality ready-mixed concrete with high strength, high durability and high fluidity. Various admixtures have been used in order to produce this high-strength, high-durability, high-fluidity, high-quality ready-mixed concrete in a short period of time. In order to do so, it is necessary to mix the cement and the admixture sufficiently uniformly, and then put them into a mixer to knead the cement and the admixture with other materials.

However, in the conventional weighing hoppers of (1) and (2) described above, after the cement and the admixture are weighed, the cement and the admixture are not mixed together, but are put into the mixer. Then, it was necessary to knead the cement and the admixture with other materials for a long time.
The present invention is proposed in view of the above problems, the object of the present invention, the cement and the admixture can be uniformly mixed before charging into the mixer, cement and admixture in the mixer and other The point is to provide a cement weighing hopper that can shorten the time of kneading with the materials.

[0005]

In order to achieve the above object, the present invention relates to a cumulative cement weighing hopper of cement and admixture, wherein a cement weighing section and an admixture weighing section are provided above a cement weighing hopper body. , And a horizontal shaft is rotatably mounted in the main body of the cement weighing hopper, multiple arms are radially mounted on the horizontal shaft, and one side is in the right-hand screw direction with the center part as the boundary, and the remaining one side is in the left-hand screw direction. Further, each of the screw-shaped mixing and stirring paddles formed is attached to the tip of each arm, and the rotation driving device for rotating the horizontal shaft is attached to the cement weighing hopper body.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the cement weighing hopper of the present invention will be described with reference to an embodiment shown in FIGS. FIG.
Is a vertical sectional front view showing the cement weighing hopper, and FIG.
The side view and FIG. 3 are side views schematically showing a ready-mixed concrete manufacturing plant to which the cement weighing hopper is applied.

First, an outline of a ready-mixed concrete manufacturing plant will be described with reference to FIG. 3. 1 is a belt conveyor for gravel / sand transportation, 2 is cement transportation equipment, 3 is admixture transportation equipment, 4
Is a gravel / sand distribution device, 5 is a cement storage tank, 6 is an admixture storage tank, 7 is a gravel storage tank, 8 is a sand storage tank, 9 is a cement weighing unit (rotary feeder + cut gate), 10 is an admixture Weighing unit (rotary feeder + cut gate), 11
Is a gravel weighing gate, 12 is a sand weighing gate, 13 is a cement weighing hopper of the present invention, 14 is a gravel weighing hopper, 15 is a sand weighing hopper, 16 is a cement charging chute, 17 is a gravel charging chute, 18 is a sand charging chute, Reference numeral 19 is a concrete mixer, and 20 is a concrete hopper.

Next, the cement weighing hopper 13 is shown in FIG.
Explaining with reference to FIG. 2, 23 is a cement weighing hopper body, and the cement weighing unit 9 (rotary feeder 21a + cut gate 2 is provided on the top of the cement weighing hopper body 23.
2a) and the admixture weighing section 10 (rotary feeder 21b
+ Cut gate 22b) is provided. 24 is a weight detecting device interposed between the cement weighing unit 9 and the admixture weighing unit 10 and the cement weighing hopper body 23; 25 is a horizontal axis rotatably provided in the cement weighing hopper body 23; A plurality of arms radially attached to the shaft 25, 27 are screw-shaped mixing and stirring paddles formed on one side in the right-hand screw direction and the remaining one side in the left-hand screw direction with the central part as a boundary. The mixing and stirring paddle 27 is attached to the tip of each arm 26.

28 is a motor with a speed reducer attached to the cement weighing hopper body 23 via a bracket (not shown), 29a is a drive side sprocket wheel attached to the output shaft of the motor with a speed reducer 28, and 29b is the above. A driven sprocket wheel attached to one end of the horizontal shaft 25, and a roller chain 30 which is suspended between the drive side sprocket wheel 29a and the driven side sprocket wheel 29b, 31
Is a discharge gate provided at the lower end of the cement weighing hopper body 23, and 32 is a cylinder for the discharge gate 31.

Next, the operation of the cement weighing hopper 13 will be specifically described. The electric motor with reduction gear 28 is started, and its rotation is transmitted to the horizontal shaft 25 through the drive side sprocket wheel 29a → the roller chain 30 → the driven side sprocket wheel 29b, and the vertical shaft 25, each arm 26, and screw-shaped mixing. Rotate the stirring paddle 27.

In this state, the measurement of the cement is started, and the cement is supplied into the cement measuring hopper body 23 through the rotary feeder 21a and the cut gate 22a of the cement measuring section 9. This cement is sent toward the center while being stirred by the screw-shaped mixing and stirring paddle 27, and at the center, the cement is pushed upward by the cement sent later to form a mountain,
It collapses in the left-right direction, goes toward both ends, and is fed from both ends toward the center while being stirred by the mixing and stirring paddle 27.

When the preset cement blending weight value is detected by the weight detecting device 24, the rotary feeder 21a is stopped, the cut gate 22a is closed, and the measurement of cement is completed. Next, the mixture is weighed, the rotary feeder 21b of the admixture weighing unit 10 is operated, the cut gate 22b is opened, and the admixture to be incrementally weighed is started.

At this time, the powder mixer having the screw-shaped mixing and stirring paddle 27 is in operation, and thereafter, the cement and the admixture are stirred and mixed while circulatingly moving as described above. The stirring and mixing of the cement and the admixture are continued until the measurement of the admixture is completed. When the cumulative measurement value of the cement and the admixture is detected by the weight detection device 24, the rotary feeder 21b is stopped and the cut gate 22b is opened. Close to complete metering of admixture.

Next, the discharge gate 31 provided at the bottom of the cement weighing hopper main body 23 is opened, and the cement and the admixture uniformly stirred and mixed are swiftly and evenly distributed by the rotating effect of the screw-shaped mixing and stirring paddle 27. It is introduced into the mixer through the introduction chute provided below the cement weighing hopper body 23, and is kneaded with other materials. The operation method of the powder mixer having the screw-shaped paddle 27 for mixing and stirring differs depending on whether the inverter is used or not. The above embodiment is an operation example when the inverter is not used, but when the inverter is used,
Rotate the powder mixer at a low speed before the start of cement weighing, and rotate the powder mixer at a normal speed from the start of cement weighing until the admixture weighing is completed. Until just before the admixture is discharged, the powder mixer is rotated at a high speed to promote agitation and mixing, and when the cement and the admixture are discharged, the powder mixer is rotated again at a normal speed and returned to the low speed rotation upon completion of the discharge.

[0015]

As described above, the cement weighing hopper of the present invention has the screw-shaped mixing and stirring paddles formed on one side in the right-hand screw direction and the remaining one side in the left-hand screw direction with the central portion as a boundary. The shaft is rotated in the cement weighing hopper body, and in this state, the cement weighing unit starts weighing the cement and supplies the cement into the cement weighing hopper body. This cement is sent in the direction of the central part while being stirred by the screw-like mixing and stirring paddle, and in the central part, it is pushed upward by the cement sent later, forming a mountain, and then in the left-right direction. Then, it is sent to the central portion while being stirred by the mixing and stirring paddle from both the ends. Then, when the preset cement blending weight value is reached, the measurement of the cement is completed, then the process of measuring the admixture is started, and the admixture measuring unit starts the measurement of the admixture. At this time, the powder mixer having the screw-shaped paddle for mixing and stirring is operating, and thereafter, the cement and the admixture are agitated and mixed while being circulated and moved as described above to uniformly mix the admixture with the cement. Then, the cement and the admixture, which are uniformly stirred and mixed, are put into a mixer and kneaded with other materials, so that the cement and the admixture can be uniformly mixed before being put into the mixer, It is possible to shorten the kneading time between the cement and the admixture and the other material.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a cement weighing hopper of the present invention.

FIG. 2 is a side view of the cement weighing hopper.

FIG. 3 is a side view showing an outline of a ready-mixed concrete manufacturing plant to which the cement weighing hopper is applied.

[Explanation of symbols]

9 Cement Weighing Unit (Rotary Feeder 21a + Cut Gate 22a) 10 Admixture Weighing Unit (Rotary Feeder 21b + Cut Gate 22b) 13 Cement Weighing Hopper 23 Cement Weighing Hopper Main Body 24 Weight Detecting Device 25 Horizontal Shaft 26 Arm 27 Screw Mixing and Mixing Paddle 28 Electric motor with reduction gear 29a Drive side sprocket wheel 29b Driven side sprocket wheel 30 Roller chain 31 Discharge gate 32 Cylinder for discharge gate 31

[Procedure amendment]

[Submission date] September 18, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

Next, the operation of the cement weighing hopper 13 will be specifically described. The electric motor with reduction gear 28 is started, and its rotation is transmitted to the horizontal shaft 25 via the drive side sprocket wheel 29a → the roller chain 30 → the driven side sprocket wheel 29b, and the horizontal shaft 25, each arm 26 and the screw-shaped mixing. Rotate the stirring paddle 27.

Claims (1)

[Claims] 1. A progressive cement weighing hopper of cement and admixture, wherein a cement weighing section and an admixture weighing section are provided above a cement weighing hopper body, and a horizontal shaft is rotatably mounted in the cement weighing hopper body. , Radially attach a plurality of arms to the same horizontal axis, with one side in the right-hand screw direction and the remaining one side in the left-hand screw direction with the central part as a boundary, the screw-shaped mixing and stirring paddles formed respectively for the above arms. A cement weighing hopper, characterized in that a rotary drive device for rotating the horizontal shaft is attached to the tip of the cement weighing hopper body.