JPS641623B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a concrete compaction vibrator device for applying vibration to fresh concrete during compaction.

Vibration work is necessary to achieve a high-quality finish when compacting concrete. For fresh concrete with different slump values,
If the values of the vibration period, vibration amplitude, and vibration time are selected in an optimal combination according to the slump value, the vibration effect is increased and a finish of higher quality can be obtained. In response to this, the applicant filed a patent application in 1983.
As disclosed in No. 85677 (Japanese Unexamined Patent Publication No. 59-213863), by simply inputting a setting signal corresponding to the slump value of the ready-mixed concrete to be used, the vibrator device can be automatically adjusted according to the slump value of the fresh concrete used. Concrete compaction equipped with a power source that outputs driving power with a frequency and voltage value that enables operation with the optimum vibration period and vibration amplitude, and a vibration time transmission means that transmits the required vibration time to the worker. invented a device.

The object of the present invention is to provide a vibrator device for concrete compaction which is extremely suitable for use as a tip vibrating section of such a concrete compaction device.

The present invention will be explained below based on the drawings. 1st
5 to 5 are diagrams showing embodiments of the present invention.

First, to explain the structure, reference numeral 1 in FIG. 1 denotes an outer shell which is formed into a bottomed cylindrical shape having an appropriate diameter, and an inverted conical conical surface 1a is formed at the lower part of the inner circumferential surface of the outer shell. Inside this outer shell 1, an integrally connected body of an amplitude control device U, an AC induction motor M, and a slider 3 attached to the output shaft 2 of this motor M can be moved in a conical manner by a ball joint J. It is suspended.

In the amplitude control device U, as shown in FIG. 2, a solenoid SOL is housed in a cylindrical case body 4, and a variable length shaft 5 is removably fitted into the solenoid SOL. In the illustrated example, the variable length shaft 5 is made by connecting a magnetic body part 5a and a non-magnetic body part 5b, and the magnetic body part 5a is arranged inside the case body 4. A flange 5c is connected to the magnetic body 5a, and a coil spring 6 is compressed between the flange 5c and the solenoid SOL, so that the variable length shaft 5 is always kept at the uppermost position (second position) in the case body 4. It is locked in such a way that it is pushed up to the position shown in the figure. solenoid
A variable DC voltage for amplitude control is supplied to the SOL from the outside through a cable 7. A support shaft 8 is protruded from the upper part of the case body 3, and the amplitude control device U is suspended at an upper position inside the outer shell 1 by a ball joint J provided on the support shaft 8. As shown in FIG. 3, the upper end of the support shaft 8 is locked to the outer shell 1 via a coil spring 9 and a locking pin 10, and the support shaft 8 itself is restricted from rotating.

In the example shown, a three-phase AC induction motor M is used, with the output shaft 2 facing downward and the variable length shaft 5
is attached to the bottom end of the The AC induction motor M is suspended inside the outer shell 1 so that its vertical position can be varied by controlling the amount of insertion and removal of the variable length shaft 5. This AC induction motor M rotates at a rotational speed corresponding to the frequency of electric power supplied from the outside through a cable 11,
It generates torque according to the voltage value. Note that the AC motor is not limited to a three-phase AC induction motor, but may also be a single-phase AC induction motor, or a three-phase or single-phase AC synchronous motor.

As shown in FIG. 4, the slider 3 is formed into a sector-like shape, and is attached to the output shaft 2 at a portion corresponding to the latch, and a ball bearing 3a is arranged on the arc-shaped sliding surface portion. ing. The slider 3 is
When the vertical position of the AC induction motor M is varied, its height position is varied within the range in which the conical surface 1a is formed, and the portion of the conical surface 1a rotates and slides at the variably set height position.

Reference numeral 12 connected to the upper part of the outer shell 1 is a flexible hose, and the cables 7 and 11 are inserted through the hose 12 and led to a vibrator power source (not shown).

Next, the action will be explained.

Insert the vibrator device to an appropriate depth into the fresh concrete poured into the formwork, etc. Initially, when no voltage is applied to the amplitude control device U, the axes of the variable length shaft 5 and the output shaft 2 are on line A-A' in FIG. 1, and the inclination angle of the axes is zero. Next, the AC induction motor M is supplied with electric power consisting of a voltage value and a frequency value set corresponding to the slump value of fresh concrete, and the amplitude control device U is supplied with a required amplitude that is also selected according to the slump value. Supplies a DC voltage with a value corresponding to the amount.

When the above DC voltage is supplied to the amplitude control device U, a current having a value corresponding to this voltage value flows through the solenoid SOL, and a magnetic force is generated. The magnetic body portion 5a is attracted downward in FIG. 2 by this magnetic force, and the variable length shaft 5 protrudes to a position where this magnetic force and the elasticity of the coil spring 6 are balanced. Therefore, AC induction motor M
and the slider 3 descend as one, and the slider 3
is variably set at a required height position in accordance with its slump value on the conical surface 1a.

FIG. 5 shows a case in which the amount of protrusion of the variable length shaft 5 is approximately the maximum. At this time, the slider 3 is pushed by the conical surface 1a, and the axis is inclined by an angle θ with respect to the line A-A'. Therefore, as the height position of the slider 3 changes, the inclination angle of the axis changes within the angular range of 0 to θ degrees, and is set at a required angular position within this range. The slider 3 rotates and slides on the conical surface 1a by driving the electric motor M while being tilted at this required angle. Therefore, a conical motion (so-called misosuri motion) occurs in the integrally connected body of the amplitude control device U and the AC induction motor M, with the center of motion at the position of the ball joint J.
At the same time, the outer shell 1 is driven from inside by the slider 3 to perform a conical movement relative to the integrally connected body. Thus, the entire vibrator device moves in a conical manner with its center of motion near the location of the ball joint.

The amplitude of the conical motion at this time is proportional to the height position of the slider 3 set by the amplitude control device U and the torque of the AC induction motor M, that is, the voltage value of the supplied power, and its vibration period. is proportional to the rotational speed of the AC induction motor M, that is, the frequency of the supplied power. As a result, the vibrator device uses power, etc., at a voltage and frequency set to the required value supplied from the outside in accordance with the slump value of the ready-mixed concrete to be used, and vibrates inside the ready-mixed concrete with the corresponding vibration amplitude and vibration period. vibrate. Therefore, if the worker operates the vibrator device for the required time indicated on a separate vibration time display means, the ready-mixed concrete will be effectively produced with the highest strength and highest quality possible at that slump value. be consolidated.

In the above embodiments, the amplitude control device uses an electromagnetic means including a solenoid and a variable length shaft that is inserted into and removed from the solenoid, but it is also possible to use other means such as hydraulic drive or screw mechanism drive. can also be applied.

As detailed above, according to the present invention, the outer shell body has a bottomed cylindrical shape and has a conical surface formed on the lower part of the inner peripheral surface;
an amplitude control device that includes a solenoid and a variable length shaft whose insertion/removal amount can be varied depending on the voltage value supplied to the solenoid, and is suspended within the outer shell by a ball joint;
an AC motor that is suspended in an outer shell body with its output shaft facing downward in a variable vertical position via an amplitude control device, and that generates a rotation speed corresponding to the frequency of applied power and a torque corresponding to its voltage value; and an AC motor that is attached to the output shaft. and a slider that rotates and slides at a variably set height position on the conical surface, and the slider drives the outer shell from the inside to move a position near the ball joint installation part. Since the center moves in a conical manner, the vibration amplitude and vibration period can be adjusted appropriately using the externally supplied power with the voltage and frequency set to the required value corresponding to the slump value of the fresh concrete used. This has the effect of being able to vibrate fresh concrete. Therefore, it is possible to effectively compact the fresh concrete with the highest strength possible at its slump value and the highest finished quality.

[Brief explanation of drawings]

1 to 5 show an embodiment of the vibrator device for concrete compaction according to the present invention. FIG. 1 is a side view showing the outer shell portion in cross section, and FIG. 2 is a side view showing the amplitude control device portion. 3 is a sectional view taken along the - line in FIG. 1, FIG. 4 is a sectional view taken along the - line in FIG. It is a diagram. 1: Outer shell, 1a: Conical surface, 2: Output shaft, 3:
Slider, 4: Cylindrical case body, 3a: Ball bearing, 5: Variable length shaft, 5a: Magnetic body part, 5b:
Non-magnetic part, 6: Coil spring, 7, 11:
Cable, 8: Support shaft, 9: Coil spring, 10: Locking pin, J: Ball joint, M: AC induction motor, SOL: Solenoid, U: Amplitude control device.

Claims (1)

[Scope of Claims] 1. A bottomed cylindrical outer shell whose lower inner peripheral surface is formed into a conical surface and which is inserted into ready-mixed concrete, a solenoid, and an energizing voltage of the solenoid. an amplitude control device having a variable length shaft whose insertion/removal amount is controlled and variable and suspended inside the outer shell body by a ball joint; an AC motor that is suspended inside the outer shell and generates a rotation speed that corresponds to the frequency of applied power and a torque that corresponds to the voltage value; and an AC motor that is attached to the output shaft and has a variably set height position on the conical surface. 1. A vibrator device for compacting concrete, comprising a slider that rotates and slides, and is driven by the slider to perform a conical movement with a position near the ball joint installation part as a center of motion.