JPS5814540B2 - Concrete rod vibrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a concrete bar-shaped vibrator (hereinafter referred to as a bar-shaped vibrator) consisting of a prime mover and a vibrator, in which the vibrator has a low-frequency vibration generator, a joint, and a high-frequency vibration generator. The present invention relates to a concrete rod vibrator (hereinafter abbreviated as rod vibrator) that simultaneously generates low frequency vibrations and high frequency vibrations.

When a rod-shaped vibrator is inserted into concrete,
Vibration eliminates the internal friction between concrete particles, fluidizes the concrete, completely envelops the reinforcing bars, and penetrates into the narrow spaces of the formwork, where it is evenly compacted under the influence of gravity.

It is known that the range of this action, that is, the action radius, increases as the frequency and amplitude of the rod-shaped vibrator increases.

For this reason, high-frequency percussion is used for the vibration frequency of ordinary rod-shaped vibrators, but when the amplitude is also increased, the rod-shaped vibrators are subjected to large mechanical stress, power consumption increases, and their durability is reduced. Since this decreases reliability, the amplitude is usually kept small.

When a rod-shaped vibrator with a high frequency and a small damping amplitude is inserted into concrete, the solid concrete in the vibrating cylinder quickly becomes fluidized, but at the same time cavitation occurs.

In other words, the degree of vacuum in the immediate vicinity of the imaging tube increases, the number of bubbles around the vibrating tube increases, and this forms a damping layer, making it difficult to transmit vibration energy to the concrete, resulting in a smaller radius of action. was there.

In addition, as shown in FIG. 1, in the conventional rod-shaped vibrator, an unbalanced weight 4 is directly connected to the rotating shaft 3 of the electric motor 2 to form a vibrating section, and is built into the vibrating cylinder 1 together with the electric motor 2. When power is supplied from the power supply connection cabtire cable 5, the electric motor 2 rotates, the unbalanced weight 4 rotates together with the rotating shaft 3, and generates vibration, and the vibration energy is transferred to the surroundings through the vibration cylinder 1. Transfer to concrete.

In this case, normal vibration is high frequency vibration (6000vprrr ~
12,000 vpm) is used, and a three-phase AC motor is used for the motor, so commercial power supply (frequency 50Hz) is used.
In order to obtain high frequency vibrations from 100Hz or 60Hz, use a frequency converter to convert the commercial frequency to high frequency vibrations (100Hz or 60Hz).
~200Hz).

Therefore, there are disadvantages in that the cost of the device is high, the weight is heavy, and it is difficult to handle.

The present invention has been developed by directly connecting a high-frequency vibration generating part that generates high-frequency vibrations to a low-frequency vibration generating part with a large amplitude that is directly connected to a motor that rotates at a commercial frequency, that is, a constant rotational speed, through a joint part, thereby making it possible to reduce concrete vibration. The present invention provides a rod-shaped vibrator with a large radius of action that can rapidly fluidize concrete through high-frequency vibrations and transmit vibrational energy through a damping layer due to cavitation through high-amplitude, low-frequency vibrations when inserted into the concrete. .

An embodiment of the present invention will be described based on the drawings.

In FIG. 2, the rod-shaped vibrator 6 is comprised of a motor 7' as a prime mover, a low-frequency vibration generator 8, a joint 9, and a high-frequency vibration generator 10.

The joint part 9 consists of an outer cylinder 26, a flexible joint 25, a shaft 23, and a shaft 21.

Female threads 35 are provided at both ends of the frame 11 of the electric motor 7.
．． 12 is cut out, and a cover 36 is screwed into the female thread 35 at the upper end.

A cabtyre cable 33 for power supply connection is introduced through a ■-shaped push 3γ and a presser foot 38 provided at the center of the cover 36, and is connected to the Hide wire of the electric motor 7 by molding after wiring.

A shaft joint convex portion 14 is provided at the lower end of the rotating shaft 13 of the electric motor 7 .

The upper end of the vibrating tube 15 of the low frequency vibration generating section 8 has a female thread 1.
A male thread 12' is cut so as to be screwed into the hole 2.

A shaft joint concave portion 18 is provided on the shaft 17 of the unbalanced weight 16 so as to fit into the shaft joint convex portion 14 of the shaft 13 of the electric motor 7 .

The electric motor 7 and the low frequency vibration generating section 8 are coupled to each other by a shaft joint protrusion 14, a shaft joint recess 18, and screws 12, 12'.

A female thread 27 is cut at the lower end of the vibrating cylinder 15, and can be screwed into a male thread 27' cut in the outer cylinder 26' of the joint part 9.

A shaft joint concave portion 22 is provided in the shaft 21 of the joint portion 9, and this also applies to the shaft joint convex portion 14 of the shaft 13 of the electric motor 7. Convex portion 20
It can also be fitted.

A shaft 24 of the high-frequency vibration generating section 10 is screwed into the shaft 23 of the joint section 9, and a flexible joint 25 is provided so that rotation can be transmitted even if the shaft 24 vibrates in a conical manner. The shaft joint concave portion 22 of the shaft 21 of the joint portion 9 is fitted with the shaft joint convex portion 20 of the shaft 19 of the unbalanced weight 16 of the low frequency vibration generating portion 8 .

A female thread 28 is cut on the upper end of the vibrating cylinder of the high-frequency vibration generator 10, and a male thread 28 is cut on the outer cylinder 26 of the joint 9.
’ can be screwed together.

The rotation of the electric motor γ is transmitted to the low-frequency vibration generating section 8 by the shaft joint convex part 14 and the shaft joint recess 18, and then through the shaft joint convex part 20, the shaft joint recess 22, and then the high-frequency vibration is transmitted through the joint part 9. The rotation axis 24K of the generator 10 is transmitted.

The lower end of the rotating shaft 24 forms a transfer section 30, and the transfer section 30 moves within a corresponding transfer surface 31 on the inner surface of the vibrating cylinder 29.

The upper end of the rotating shaft 24 rotates in a bearing 32, such as a self-aligning ball bearing, so that the rotating shaft 24 can be rotated like a conical pendulum.

Also, the rotation axis 24 around the inner straight rolling surface 31 of the vibrating cylinder 29
The transfer motion of increases the frequency, and the increased frequency can be calculated from the following equation:

(See Fig. 5) Here, N - the frequency of the high-frequency vibration generator 10 n - the rotational speed D of the rotating shaft 24 - the inner diameter d of the transfer surface 31 on the inner surface of the vibrating cylinder 29 - the rolling part of the rotating shaft 24 Normally, when the rotation speed of the rotating shaft 24 is 3000 rpm, the frequency of the high frequency vibration generating part is 9500 vpm to 12000 v.
pm, the frequency is increased from 3.2 to 4 times the rotational speed of the rotating shaft.

In this way, in the rod-shaped vibrator according to the present invention, when the electric motor 7 is supplied with 7K electric power from a commercial power source through the cabtire cable 33 for power connection, the rotation of the electric motor 7 is caused by the low frequency vibration generating part 8 and the joint part 9. , is transmitted to the high-frequency vibration generating section 10, and can generate low-frequency vibrations and high-frequency vibrations at the same time.

Therefore, when this rod-shaped vibrator is inserted into concrete, the high-frequency vibration causes the concrete around the rod-shaped vibrator to rapidly fluidize, the degree of vacuum in the vicinity increases, the number of bubbles increases, and the damping layer Even if a large-amplitude low-frequency vibration is formed, vibration energy can be transmitted through this damping layer, increasing the range of vibration energy transmission, that is, the working radius, and increasing the efficiency of concrete pouring work. .

Furthermore, since each part of the rod-shaped vibrator of the present invention is configured to be detachable, for example, as shown in FIG. By attaching the metal fittings 34, it can be used as a low-frequency rod-shaped vibrator, and by connecting the high-frequency vibration generator 10 to the electric motor 7 via the joint 9, as shown in FIG. 4, it can also be used as a high-frequency rod-shaped vibrator. The practical effects of this rod-shaped vibrator are great.

[Brief explanation of the drawing]

Figure 1...Cross-sectional view of a conventional concrete rod vibrator, Figure 2
Figure...A cross-sectional view of the concrete rod-shaped vibrator according to the present invention,
Figure 3: A sectional view of the concrete rod vibrator according to the present invention used as a low frequency vibrating rod vibrator, Figure 4: The concrete rod vibrator according to the present invention being used as a high frequency vibrating rod vibrator Cross-sectional view of the case, Figure 5...Second
Figure A-A sectional view. 6... Concrete rod vibrator, 7... Electric motor, 8... Low frequency vibration generating section, 9... Joint section, 10... High frequency vibration generating section, 1
DESCRIPTION OF SYMBOLS 1... Frame, 12... Female thread of frame 11, 12' Outer cylinder... Male thread of 15, 13... Motor shaft, 14... Shaft joint convex portion, 15... Vibration tube, 16... Unbalanced weight, 1T... Unbalanced weight shaft,
18... Shaft joint recess, 19... Unbalanced weight shaft, 20... Shaft joint convex part, 21... Shaft, 22... Shaft joint recess, 23... Shaft, 24... Shaft, 25... Flexible joint, 26... Outer cylinder, 27... Female thread of outer cylinder 15, 27'... Upper male thread of outer cylinder 26, 28... Female thread of outer cylinder 29, 28'... Lower male thread of outer cylinder 26, 29... Vibrating cylinder, 30... Rolling part, 31... Transfer surface, 32... Bearing, 33... Cabtire cable, 34... Tip metal fitting.

Claims (1)

[Claims] 1. A prime mover that rotates at a constant rotational speed, a low-frequency vibration generator that is detachably coupled to the prime mover, rotates at the same rotational speed as the prime mover, and generates vibrations at the same frequency as the rotational speed, and the prime mover. a high-frequency vibration generating section that rotates at the same rotation speed as the rotation speed and generates vibrations with a higher frequency than the rotation speed;
A concrete rod-shaped vibrator comprising a joint part that detachably connects the low frequency vibration generating part and the high frequency vibration generating part.