JP3171435B2 - Concrete mixer and concrete manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete mixer and a method for producing concrete, and more particularly to a concrete mixer and a method suitable for producing high fluidity concrete.

[0002]

2. Description of the Related Art As a conventional concrete production method suitable for production of high-fluidity concrete, for example, Japanese Unexamined Patent Publication No.
No. 57738, Japanese Patent Application Laid-Open No. 9-61332 and Japanese Patent No. 2640316. That is, in the method disclosed in Japanese Patent Application Laid-Open No. 9-57738, gravel is charged and kneaded until the power of the mixer reaches the load capacity limit value, and after the kneading is completed, water is added and the remaining gravel is charged to mix. It is something to do. In addition, the method disclosed in Japanese Patent Application Laid-Open No. 9-61332 is to detect the amount of fresh concrete stored in the hopper when the ready-mixed concrete is dispensed from the mixer to the hopper, calculate the storage speed, and thereby evaluate the fluidity of the ready-mixed concrete. It is. Patent No. 264
In the method disclosed in Japanese Patent No. 0316, a paste for high-fluidity concrete is prepared using a paste mixer, and then mixed with sand and gravel by a truck agitator.

[0003]

When producing a high fluidity concrete, the slump flow value is sensitive to fluctuations in the amount of surface water of the fine aggregate and the coarse particle ratio. It is necessary to control the amount of water with high precision. However, since concrete materials are often not homogeneous, the prior art
It is difficult to control the amount of the concrete material to be used, particularly the amount of water, with high accuracy, and there is a problem that high-quality high-fluidity concrete cannot be produced unless at least a thickener or the like is used.

The present invention has been made in view of such conventional problems, and a concrete mixer and a concrete manufacturing method capable of manufacturing high-quality high-flow concrete without using a thickener or the like. It is intended to provide.

[0005]

In order to achieve the above object, a concrete mixer according to the present invention comprises: a hopper for charging a concrete material; a hopper provided rotatably in the hopper, and a concrete mixer in the hopper. A kneading blade for kneading the material; a first motor for rotating the kneading blade; and a second motor for rotating the kneading blade.
A motor; and a torque converter for detecting a torque when transmitting rotation from the second motor to the kneading blade.

Concrete materials include cement, powder,
Water and aggregate are essential, and it is preferable that a high-performance water reducing agent is further included. The first motor preferably has a large output in order to enhance the kneading effect, and the second motor preferably has a small output so as not to apply an excessive load on the torque converter. The concrete mixer according to the present invention may be composed of a uniaxial mixer, a biaxial mixer, a pan-type mixer, and other types of mixers.

[0007] The concrete mixer according to the present invention preferably has a material metering control panel for obtaining an amount of concrete material in accordance with the torque detected by the torque converter. In this case, the amount of the concrete material can be automatically obtained, and the material management becomes easy.

[0008] The concrete mixer according to the present invention preferably has a control device for issuing a completion signal when the torque detected by the torque converter is equal to or less than a predetermined lower limit torque. In this case, it is possible to know that the optimum kneading has been performed and that a high-quality high-fluid concrete has been kneaded. Note that the second motor may be automatically stopped in response to the completion signal.

The method for producing concrete according to the present invention is a method for producing concrete by kneading concrete material by rotating the kneading blades: a first kneading step in which the kneading blades are rotated by a first motor to knead the concrete material. After the first kneading step, a second kneading step of kneading the concrete material by rotating the kneading blades with a second motor; and transmitting the rotation from the second motor to the kneading blades during the second kneading step. A detecting step of detecting a torque at the time; and a material controlling step of charging an amount of concrete material according to the detected torque detected in the detecting step into the hopper.

In the concrete mixer and the concrete manufacturing method according to the present invention, the concrete material is put into the hopper, and the first motor is used to knead the concrete material at the initial stage of kneading where the kneading blade rotates with a large torque. When the kneading progresses and the torque at the time of rotating the kneading blades becomes small, the first motor is stopped and the concrete material is kneaded by the second motor. At this time, the torque converter detects the torque when transmitting rotation from the second motor to the kneading blade. As a result, a large force can be prevented from being applied to the torque converter, and the torque can be measured with high accuracy using a high-precision torque converter. By putting the amount of concrete material according to the torque detected by the torque converter into the hopper, the amount of concrete material to be used can be controlled with high accuracy, and high quality can be achieved without using a thickener or the like. High fluidity concrete can be manufactured.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. As shown in FIG. 4, the concrete production system includes a concrete mixer 1, a material measurement control panel 2, a moisture meter sensor 3, a slump flow controller 4, a main computer control panel 5, and a display 6.
, A fuzzy control feedback device 7 and a recorder 8.

As shown in FIGS. 1 to 4, the concrete mixer 1 includes a base 11, a hopper 12, and a kneading blade 13.
(See FIG. 4), the first motor 14 and the second motor 15
, A torque converter 16, a first transmission mechanism 17, and a second transmission mechanism 18. As shown in FIG.
1 has casters 19 at the bottom. Hopper 12,
It consists of a container for putting concrete material and is fixed to the base 11. A gate 20 that can be opened and closed is provided at the bottom of the hopper 12. The kneading blade 13 is rotatably provided in the hopper 12 by inserting a shaft 22 into a bearing 21 provided on a side wall of the hopper 12 so as to knead the concrete material in the hopper 12. A sprocket pinion 23 is fixed to the shaft 22 outside the hopper 12. The first motor 14 and the second motor 15 are fixed to the base 11.

As shown in FIGS. 1 to 3A, the first transmission mechanism 17 includes a chain coupling 24, two cam clutches 25 and 26, a sprocket pinion 27,
Shaft 28 and two pillow-shaped units 29, 30
, A sprocket wheel 31 and a chain 32. The two pillow-type units 29 and 30 are attached to the base 11
And supports the shaft 28. The rotation shaft 14a of the first motor 14 is coaxially arranged with a chain coupling 24, a cam clutch 25, and a shaft 28.
The rotation is transmitted to the sprocket pinion 27 via the.
The first motor 14 can rotate independently of the second motor 15. Sprocket wheel 31 transmits rotation to sprocket pinion 27 via cam clutch 26 and shaft 28. Sprocket pinion 27
Can rotate the kneading blade 13 by rotating the sprocket pinion 23 via the chain 32.

As shown in FIGS. 1 to 3B, the second transmission mechanism 18 includes two chain couplings 33 and 34.
, A shaft 35, and two pillow-shaped units 36, 3
7, a sprocket pinion 38, and a chain 39. The two pillow-type units 36 and 37 are attached to the base 1
1 and supports the shaft 35. The rotation shaft 15a of the second motor 15 transmits rotation to the sprocket pinion 38 via the chain coupling 33, the torque converter 16, the chain coupling 34, and the shaft 35 arranged coaxially. The second motor 15
It can rotate independently of the motor 14. A torque limiter 40 is fixed to the sprocket pinion 38. The sprocket pinion 38 is
9. The sprocket pinion 23 can be rotated via the sprocket wheel 31, the sprocket pinion 27 and the chain 32, and the kneading blade 13 can be rotated. The torque converter 16 can detect a torque when transmitting rotation from the second motor 15 to the kneading blade 13.

As shown in FIG. 4, the material measuring control panel 2 comprises:
The measured values of water and other materials to be put into the concrete mixer 1 are determined according to the torque detected by the torque converter 16, and each measurement data is transferred to the main computer control panel 5. The measurement value of each material can be set with high accuracy by weight or volume. The moisture meter sensor 3 measures the moisture of each concrete material and transfers the measured data to the slump flow controller 4. The main computer control panel 5 calculates respective data by the material weighing control panel 2 and the slump flow controller 4, controls the first motor 14 and the second motor 15, and transfers parameter data to the display 6. In particular, when the torque detected by the torque converter 16 is equal to or less than the predetermined lower limit torque, the main computer control panel 5 issues a completion signal by the display 6 to stop the second motor 15. The display 6 receives the electric signal of the torque detected by the torque converter 16 and displays the load state of the torque converter 16 according to the parameter data from the main computer control panel 5. The fuzzy control feedback device 7 performs feedback control of the rotation state of the concrete mixer 1 to correct the calculation of the display 6. The recorder 8 displays various data in an analog and digital manner on an intelligent on-demand basis, stores the resulting data in a memory, and prints out the data.

Next, the operation will be described. In order to produce concrete by the concrete mixer 1, concrete, cement, water, aggregate (sand),
Add powder and high performance water reducing agent. First, the kneading blades 13 are rotated by the first motor 14 to knead the concrete material (first kneading step). In the initial stage of kneading where the torque when rotating the kneading blades 13 is large, the concrete material is kneaded by the first motor 14. At this time, 85 to 9 of the total amount of water to be used is used as primary input water.
Use 0%. The remaining 10 to 15% of water is calculated in a material control process to be described later to obtain an amount to be charged, and the hopper 1
Put into 2.

When the kneading progresses, the torque when rotating the kneading blades 13 decreases, and the kneading state is stabilized, the first motor 14 is stopped, and the kneading blades 1 are driven by the second motor 15.
3 is rotated to knead the concrete material (second kneading step). At this time, the remaining 10 used in the first kneading step were used.
About 15% of water, the amount to be charged is calculated by a material control process described later, and is charged into the hopper 12 together with coarse aggregate (gravel) as secondary charging water. Note that, after driving the second motor 15, the driving may be switched to the first motor 14 again according to the kneading state. At the time of the second kneading step, the torque converter 16 detects a torque when transmitting rotation from the second motor 15 to the kneading blades 13 (detection step). Since the second motor 15 is used at the time of the second kneading process, it is possible to prevent a large force from being applied to the torque converter 16, and to measure the torque with high accuracy using the high-precision torque converter 16. can do. The torque measured with high precision changes sensitively according to the change in the surface water and coarseness of the concrete to be kneaded.

The amount of concrete material, particularly the amount of water, corresponding to the detected torque detected by the torque converter 16 in the detecting step is determined by the material measuring control panel 2 and is input to the hopper 12 (material controlling step). The material metering control panel 2 can automatically determine the amount of the concrete material, which facilitates material management. The main computer control panel 5
Material weighing control panel 2, first motor 14, and second motor 1
5 is constantly monitored and appropriate control is performed.
And perform arithmetic processing. For this whole kneading system,
By always performing appropriate monitoring and control by the main computer control panel 5, it is possible to manufacture high-quality concrete with optimal kneading and high quality. Further, the main computer control panel 5 applies fuzzy control feedback by the torque converter 16 and the electric sensor,
The first motor 14 and the second motor 15 may be automatically switched.

When the detected torque detected by the torque converter 16 is equal to or less than a predetermined lower limit torque, the main computer control panel 5 issues a completion signal on the display 6 and stops the second motor 15 (motor control step). ).
The produced high-fluidity concrete can be taken out from the gate 20 of the hopper 12.

As described above, using the first motor 14 and the second motor 15, the motor is selectively used in the initial stage of kneading of the concrete material and in the stage of advanced kneading, so that a large force is not applied to the torque converter 16. Therefore, the amount of concrete material can be controlled with high accuracy by using a high-precision torque converter 16 to measure torque with high accuracy, and the quality can be improved without using a thickener or the like. It is possible to produce high-fluid concrete with good quality. When a thickener is used, the strength of the produced high-fluidity concrete varies, but according to the above-mentioned concrete production system, high-quality high-fluidity concrete can be produced. In addition, the above-mentioned concrete production system
It can be used to make other types of concrete besides high flow concrete.

In the above-described embodiment, the case where the concrete mixer is a single-shaft mixer has been exemplified. However, it goes without saying that a two-shaft mixer or a pan-type mixer can be adopted as the concrete mixer.

[0022]

According to the concrete mixer and the concrete manufacturing method according to the present invention, the first motor and the second motor can be used.
Using a motor, the motor can be selectively used at the initial stage of kneading of the concrete material and at the stage of advanced kneading, so that a large force is not applied to the torque converter,
Using a high-precision torque transducer, it is possible to measure the torque with high precision and control the amount of concrete material with high precision, and to produce high-quality high-flow concrete without using a thickener etc. be able to.

In particular, according to the concrete mixer of the second aspect of the present invention, the amount of the concrete material can be automatically obtained by the material measuring control panel, and the material management becomes easy.

In particular, according to the concrete mixer of the third aspect of the present invention, a completion signal is issued by the control device, and it is possible to know that high-quality high-fluidity concrete has been kneaded.

[Brief description of the drawings]

FIG. 1 is a plan view of a concrete mixer according to an embodiment of the present invention.

FIG. 2 is a front view of the concrete mixer of FIG.

3A is a side view of a first motor and a first transmission mechanism of FIG. 1; FIG. 3B is a side view of a second motor and a second transmission mechanism;

FIG. 4 is a control flow chart of a concrete production system including the concrete mixer of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete mixer 2 Material measurement control panel 5 Main computer control panel 6 Display 12 Hopper 13 Kneading blade 14 1st motor 15 2nd motor 16 Torque converter 17 1st transmission mechanism 18 2nd transmission mechanism

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-16827 (JP, A) JP-A-7-16828 (JP, A) JP-A-7-16829 (JP, A) JP-A-10-108 24410 (JP, A) JP-A-9-277246 (JP, A) JP-A-8-39537 (JP, A) JP-A-63-257609 (JP, A) JP-A-64-53811 (JP, A) JP-A-4-105907 (JP, A) JP-A-5-337929 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B28C 7/04 B28C 5/14

Claims (4)

(57) [Claims] A hopper for charging a concrete material; a kneading blade rotatably provided in the hopper for kneading the concrete material in the hopper; and a first kneading blade for rotating the kneading blade. A concrete comprising: a motor; a second motor for rotating the kneading blade; and a torque converter for detecting torque when transmitting rotation from the second motor to the kneading blade. Mixer. 2. The concrete mixer according to claim 1, further comprising a material measuring control panel for obtaining an amount of the concrete material according to the torque detected by said torque converter. 3. The concrete mixer according to claim 1, further comprising a control device for outputting a completion signal when the torque detected by said torque converter is equal to or less than a predetermined lower limit torque. 4. A concrete manufacturing method for kneading a concrete material by rotating a kneading blade, comprising: a first kneading step of rotating the kneading blade by a first motor to knead the concrete material; and after the first kneading step. A second kneading step of rotating the kneading blades with a second motor to knead the concrete material, and detecting a torque at the time of transmitting the rotation from the second motor to the kneading blades during the second kneading step. A concrete manufacturing method, comprising: a step of charging a concrete material in an amount corresponding to the detected torque detected in the detecting step into the hopper.