JPH09291703A - Concrete vibrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent failure by providing a rough surface area to facilitate air dispersion on the outer periphery of both ends of a rotor positioned in the inside of the stator coil end of a motor installed in a vibration cylinder. SOLUTION: A concrete vibrator is composed of a metallic vibration cylinder 1, a motor 4 and an eccentric pendulum 7. Then, a number of copper bars 12 nearly equal in length to the length of a stator 8 are buried in parallel at specified intervals in the outer peripheral surface of the rotor 9 of the motor 4 corresponding to the inside of the stator 8. In this case, recessed and projecting parts for air dispersion are provided in both end parts 9a and 9b of the rotor 9 in a position corresponding to the inside of a stator coil end 10. Air brought into contact with both end surfaces of the rotor 9 during its rotation is dispersed by a fan effect and the coil end 10 is cooled. Instead, a number of recessed grooves of the rotor longitudinal direction are provided in the outer peripheral surface of the rotor 9 or the rotary axis outer peripheral surface of the pendulum 7. Thus, the temperature increase of the coil end is prevented, a temperature in the vibrator is made uniform and the damaging of the motor is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for inserting a rod-shaped vibrating body into concrete cast in a mold to give vibration to the concrete to improve compaction in the mold. The present invention relates to a concrete vibrator, more specifically, to a configuration of a concrete vibrator in which a motor as a drive source is built in a vibrating cylinder.

[0002]

2. Description of the Related Art Conventionally, as a concrete vibrating machine of this type, which gives vibration to concrete cast in a formwork for good compaction in the formwork, a motor as a drive source is vibrated. An internal concrete vibrator with a built-in type inside the cylinder, and a built-in eccentric pendulum only inside the vibrating cylinder, and the motor is placed at a position separated from the vibrating cylinder by a predetermined distance. An external concrete vibrator of a type in which an eccentric pendulum in a cylinder is connected via a flexible shaft is known.

[0003]

Among the concrete vibrators described above, an internal concrete vibrator in which a motor is built in a vibrating cylinder is a cord having a long length and a light weight between the vibrating cylinder and a power source. Since it can be connected by means of a vibrating cylinder, it has the advantages of good moving operability when inserting a vibrating cylinder into concrete and applying vibration, and being easy to handle, and is now more widely used than external concrete vibrators.

On the other hand, this internal concrete vibrator is
The motor heats up to a high temperature due to overload operation and no-load operation in the air immediately before being inserted into concrete or immediately after being pulled up, and this tends to cause failures, resulting in a short service life. There is a problem.

When the heat generation phenomenon of this motor is analyzed, it is found that the temperature of the coil end portion is always higher than the temperature of the internal winding portion of the stator and the temperature of the coil end portion, and is easily influenced by heat. It was

The cause is that when the stator generates heat due to the overload operation and the no-load operation in the air as described above, the inner winding portion of the stator is in contact with the inner surface of the vibrating cylinder. Even if the temperature of the part is temporarily increased, the increased temperature is lowered by the vibrating cylinder coming into contact with the concrete and being cooled by the moisture. However, since the coil end portion is not in contact with the inner surface of the vibrating cylinder, it cannot receive the cooling action due to the vibrating cylinder coming into contact with the concrete, and the elevated temperature is maintained as it is, and the high temperature is constantly maintained. Will be put in a state.

[0008]

DISCLOSURE OF THE INVENTION In view of the above-mentioned problems of conventional concrete vibrators, the present invention is directed to a case where the stator generates heat due to causes such as overload operation and no-load operation in the air. To provide a concrete vibrator that can cool the coil end portion that is not in contact with the inner surface of the vibrating cylinder to suppress the temperature rise of the coil end portion and reduce the damage rate of the motor due to heat generation. It is intended.

The concrete vibrator according to claim 1 of the present invention is a concrete vibrator with a built-in motor, wherein an eccentric pendulum built in at the tip of the inside of the vibrating cylinder is rotated by a motor arranged inside the vibrating cylinder. The outer peripheral surface of both ends of the rotor located inside of the rotor is provided with an uneven surface for air diffusion which is in contact with the outer peripheral surface.

Further, the concrete vibrator according to claim 2 is
The concrete vibrator according to claim 1, wherein the concavo-convex surface is formed of a large number of grooves along the length direction of the rotor.

A concrete vibrator according to a third aspect is the concrete vibrator according to the first aspect, in which the rotating shaft of the eccentric pendulum extends at the tip of the rotor, and the outer peripheral surface of the rotating shaft extends along the length direction of the rotor. It is characterized by having a large number of grooves.

[0012]

According to the concrete vibrator of the present invention, in the concrete vibrator with built-in motor, since the outer peripheral surfaces of both ends of the rotor located inside the coil end of the stator of the motor are provided with the uneven surface for air diffusion, When the rotor rotates, the air contacting the outer peripheral surfaces of both ends of the rotor diffuses and flows due to the uneven surface, and the coiling portion on the outside is cooled by the diffused air, so that the rise in heat generation temperature can be prevented. .

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a concrete vibrator according to the present invention will be described with reference to an embodiment shown in the drawings.
FIG. 3 is a cross-sectional view taken along the length direction of a vibrating portion in a concrete vibrator as an example, in which a metallic vibrating cylinder 1 is provided at a tip end portion of a hose portion 3 in which a lead wire 2 connected to a power source (not shown) is inserted. A motor 4 connected to the lead wire 2 is built in near the hose portion 3 inside the vibrating cylinder 1, and a rotary shaft 6 of the motor 4 is connected inside a tip head 5 of the vibrating cylinder 1. The eccentric pendulum 7 is arranged.

The motor 4 is composed of a stator 8 and a rotor 9. A stator 8 having coil ends 10 projecting from both ends is fixed to the inner peripheral surface of the vibrating cylinder 1, and both ends are inside the stator 8. 1 bearings 11a, 1
Rotors 9 are rotatably attached to the rotors 1b, respectively. The stator 8 is fixed to the inner peripheral surface of the vibrating cylinder 1, but the coil ends 10 are not in contact with the inner peripheral surface of the vibrating cylinder 1 and are spaced apart from each other.

As shown in FIGS. 2 and 3, the rotor 9 has a predetermined number of copper bars 12 having a length substantially equal to the length of the stator 8 on the outer peripheral surface corresponding to the inner portion of the stator 8. Both end portions 9a, 9b of the rotor 9 which are embedded in parallel with each other but located at a portion corresponding to the inside of the stator coil end 10.
Each is provided with an uneven surface 13 for air diffusion.

The air-diffusing uneven surface 13 is capable of diffusing air in contact with the outer peripheral surfaces of both ends 9a and 9b of the rotor 9 to generate a flow of air in the outer peripheral direction of the rotor 9. It ’s good, but both ends 9 of the rotor 9
Since there is no sufficient gap between the outer peripheral surfaces of the a and 9b and the stator coil end portion 10, as shown in FIG. 3, a large number of parallel concave grooves 14 provided along the length direction of the rotor 9 are formed. As long as it is such a thing, for example, it may be a concave portion such as a dimple of a golf ball.

The uneven surface 13 for air diffusion is formed as shown in FIG.
In the case of forming a large number of recessed grooves 14 provided along the length direction of the rotor 9, the recessed grooves provided for embedding the copper bar 12 provided in the main part of the rotor 9 are effectively extended in the left-right direction. An uneven surface for air diffusion is obtained.

In addition to the above, although not shown, the outer diameters of the outer peripheral surfaces of both ends 9a and 9b of the rotor 9 are set to the rotor 9
Cut smaller than the main part of the stator coil end 1
There is a sufficient gap between the rotor and
You may make it implant the thing like a blade | wing which consists of a metal plate in the outer peripheral surface of a, 9b.

The eccentric pendulum 7 whose both ends are rotatably supported by bearings 15a and 15b is arranged in the tip head 5 of the vibrating cylinder 1, and the rotary shaft 6 projecting at the tip of the motor 4 is arranged. And the rear end shaft 16 of the eccentric pendulum 7 are integrally connected to each other, and the eccentric pendulum 7 is rotated by the driving of the motor 4, so that strong vibration is generated in the entire vibrating cylinder 1 including the head 5.

FIG. 4 shows another embodiment. In this concrete vibrator, a spindle 40 of an eccentric pendulum 27 having a diameter smaller than that of the rotor 29 is integrally extended at the tip of the rotor 29 of the motor 24. There is.

The rotor 29 is located at a portion corresponding to the inside of the stator coil end 30 as in the first embodiment, and both ends 29a and 29b of the rotor 29 are located.
In addition, a large number of parallel concave grooves 34 are provided along the length direction as the uneven surface 33 for air diffusion, respectively,
A similar groove 44 is provided over the entire length of the support shaft 40.

Further, the eccentric pendulum 27 has a weight 27a.
41a, 41b through which the support shaft 40 penetrates at both ends of
Is provided so that the support shaft 40 has the bearings 41a and 41a.
b and is integrally fixed thereto, and the support shaft 40 on the outer side of the bearings 41a and 41b is a bearing 42.
The eccentric pendulum 27 is rotated by being driven by the motor 24 by being axially mounted in the vibrating cylinder 21 by a and 42b.

[0023]

As described above, the concrete vibrator of the present invention is provided with the uneven surface for air diffusion such as a large number of parallel concave grooves at both ends of the rotor of the motor provided in the vibrating cylinder. Since it is provided, the outer coil end portion can be constantly cooled by the fan effect in which the rotor rotates and the air contacting the surfaces of both ends is diffused, and as a result, only the coil end portion becomes abnormally hot. By suppressing the phenomenon, the temperature in the vibrating cylinder can be made uniform, the damage of the motor can be prevented, and the durability can be improved.

On the other hand, like the concrete vibrator shown as the second embodiment, in the structure in which the support shaft of the eccentric pendulum having a small diameter is integrally extended at the tip of the rotor and the eccentric pendulum is pivotally mounted by the support shaft. The left end of the rotor and the right end of the eccentric pendulum may be supported by a single bearing, and there is an advantage that the cost can be reduced because the bearing is sufficient at both ends and the center.

Further, in this type of concrete vibrator, when the motor head is conventionally repaired and repaired and the tip head of the vibrating cylinder is removed and the rotor inside is pulled out to the outside, the airtightness inside the vibrating cylinder is good. Therefore, there is a problem that the inside of the motor becomes a negative pressure and it is difficult to pull out the rotor to the outside. However, like the concrete vibrator of the second embodiment, the rotor is also attached to the surface of the spindle supporting the eccentric pendulum. In the structure with the same groove for air diffusion as at both ends of the motor, if the head at the end of the vibrating cylinder is removed during repair and repair of the motor, the eccentric pendulum part and the inside of the motor will be separated via the groove on the surface of the support shaft. Since the negative pressure state inside the motor is canceled by communicating, the rotor can be easily pulled out to the outside,
This has the effect of making repairs easier.

[Brief description of drawings]

FIG. 1 is a central subordinate sectional view showing an embodiment of a concrete vibrator according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

FIG. 4 is a central slave cross-sectional view showing the configuration of another embodiment.

5 is a perspective view of an eccentric pendulum portion of the embodiment of FIG.

[Explanation of symbols]

 1: Vibrating cylinder 2: Lead wire 3: Hose part 4, 24: Motor 5: Vibrating cylinder head 6: Rotating shaft 7,27: Eccentric pendulum 8: Stator 9,29: Rotor 10: Coil end 11a, 11b: Bearing 12 : Copper bar 13: Air diffusion uneven surface 14,44: Recessed groove 15a, 15b: Bearing 16: Pendulum rear end shaft 27a, 27b: Weight part 40: Support shaft 41a, 41b: Bearing 42a, 42b: Bearing

Claims (3)

[Claims] 1. A concrete vibrator with a built-in motor, wherein an eccentric pendulum built inside a vibrating cylinder is rotated by a motor arranged inside the vibrating cylinder, wherein both ends of a rotor located inside a stator coil end of the motor are outer peripheries. A concrete vibrating machine, characterized in that the surface is provided with an uneven surface for air diffusion that is in contact with the outer peripheral surface. 2. The concrete vibrator according to claim 1, wherein the uneven surface comprises a large number of concave grooves along the length direction of the rotor. 3. The concrete vibrator according to claim 1, wherein a rotating shaft of the eccentric pendulum extends at the tip of the rotor, and a large number of concave grooves are provided on the outer peripheral surface of the rotating shaft along the length direction of the rotor. Concrete vibrator.