JP2872949B2 - Electric rotary vibrator cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric rotary vibrator (rotary vibrator) used in civil engineering construction work, such as a vibrating pile driver, for example.
For electric rotary vibrator General of the start-up compaction for civil construction work, including such, the present invention relates to that equipment to cool it.

[0002]

2. Description of the Related Art A rotary vibrator is a device that generates vibration by rotating a rotary shaft having an eccentric weight attached thereto. In addition, there is a vibrator of a type that reciprocates a hydraulic cylinder, and is widely used. A device for generating vibration used in civil engineering work will be referred to as a vibration exciter.

FIG. 3 is a schematic vertical sectional view showing a conventional electric rotary vibrator. However, the structure,
It is schematically drawn for convenience of understanding the function, and is not necessarily a realistic projection view. Reference numeral 1 denotes an exciter, which is driven to rotate by an electric motor 2. Reference numeral 3 denotes a transmission mechanism that supplies the rotation output of the electric motor 2 to the vibration generator 1. A chuck mechanism 4 for gripping the pile is installed in the vibration unit 1. In the structure of the vibrating section 1, an eccentric weight 6 'is attached to a rotating shaft 5', and the rotating shaft 5 '
Are rotatably supported by the vibrating section case 32 by vibrating section bearings 7a and 7b.

In such a configuration, when the rotating shaft 5 'to which the eccentric weight 6' is attached rotates, the shaft is in a so-called unbalanced state and vibrates vertically and horizontally. For this reason, a plurality of pairs of the eccentric weight 6 'and the rotating shaft 5' are generally arranged, and the vibration in the left-right direction is canceled and the vibration in the vertical direction is used effectively. When a pile driving operation is performed using the above-described exciter, prevention of vibration pollution and prevention of noise pollution are important issues. Next, a technical problem relating to vibration pollution will be described with reference to FIGS.

FIG. 4 is a schematic diagram for explaining vibration pollution in a pile driving operation. This figure shows a state in which the vibration device 6 is suspended by the crane boom 5, the upper end of the pile 7 is gripped by the chuck 6 a of the vibration device 6, and the pile 7 is vibrated and driven into the ground. Is drawn. When the lower end of the pile 7 is brought into contact with the ground surface to start the pile driving operation, if the vibration device 6 is fully operated from the beginning, the surface wave a generated on the ground at the pile driving point is hardly attenuated and the nearby private house 8 , Causing vibration pollution problems. Here, if the vibrating force of the vibrating device 6 can be adjusted arbitrarily, the pile driving operation is started while giving a slight vibration in addition to the weight of the pile 7, and after driving several meters, the vibration may be gradually increased. . If the hypocenter position corresponding to the lower end of the pile 7 becomes deeper, the underground wave b attenuates on the way to the private house 8, so that the vibration pollution is negligible.

FIG. 5 is a table showing changes in the vibration frequency at the time of starting and stopping the operation of the vibrating device, and the horizontal axis represents time. Start of operation time t _0, between time t ₁ to reach the rated operating state, frequency rises rapidly as indicated by the arrow c. During the above frequency rise, the natural frequency n ₁ of the ground,
And the natural frequency n ₂ of the crane boom. However, since the rotational speed increase period T ₁ at the start operation is generally short (e.g., about 3 seconds), the resonance problem when frequency of the vibration device matches the natural frequency, can be usually ignored it can. However, between the time t ₂ of stopping the energization of the motor of the vibrating device 6 (not shown) to the time t ₃ when the rotary shaft is stopped is gradually decelerated as indicated by the arrow d while continuing to rotate at a rotational axis of inertia . The above-mentioned rotation speed reduction period T
_{Since 2} is a relatively long time (for example, about 50 seconds), there is a possibility that the crane boom will resonate and be damaged when passing the natural frequency n ₂ of the crane boom on the way. Further, when passing through the natural frequency n ₁ of the ground, there is a possibility that vibration pollution may occur due to resonance of the ground. The time t
_{If the} motor could be de-energized in step ₂ and the vibrating device could change the rotational phase of the vibrating device's rotating weight to zero the vibrating force, it would be possible to prevent problems related to resonance during the operation of stopping the vibrating device. Can be.

Next, looking at the amount of energy supplied to the vibrating device, the vibrating device 6 from the time t ₀ to t ₁ described above.
If the speed is increased while the vibration is generated by the eccentric weight (not shown) of the vibration device while the rotation speed of the vibration device is increasing, a large-capacity motor or a large-capacity power supply facility is required to drive the vibration. . In this case, the operation is started in a state where the vibration force is reduced to zero by changing the rotation phase of the eccentric weight of the vibration device, and if the vibration force can be exerted after reaching the rated rotation speed,
It is economical because the motor capacity and power supply capacity can be reduced. This is because, after reaching the rated rotation speed, there is no need to store any more rotational energy in the rotating member, and the operation can be continued by replenishing energy sufficient to compensate for the attenuation of vibration.

As described above, the rotary vibrator is configured by attaching eccentric weights to each of the even number of rotating shafts, and is controlled so as to prevent or reduce vibration pollution caused by resonance.

FIG. 6 is a partially broken side view of the conventional electric rotary vibrator shown in FIG. 3 and its supporting mechanism as viewed from a direction perpendicular to FIG. In this conventional example, as shown in FIG. 6, two rotating shafts 5 'and two eccentric weights 6' are provided. In order to synchronously rotate the two eccentric weights 6 'in opposite directions at the same rotational speed,
A synchronous rotary gear 8 'is fixed to each of the rotary shafts 5', and the synchronous rotary gears 8 'are meshed with each other. The two synchronous rotating gears 8 'are
In FIG. 3, only one of them overlaps with the other.

A motor shaft 10 of the electric motor 2 shown in FIG. 3 has a rotor 12 fixed thereto and is rotatably supported on a motor casing 33 by a motor bearing 14. Reference numeral 13 denotes a stator, which is fixed to the motor casing 33 described above.
A drive pulley 11 is fixed to the motor shaft 10, and a driven pulley 9 is fixed to the rotating shaft 5 ', and a belt 12' is wound between both pulleys.

A conventional electric rotary vibrator having the configuration described above with reference to FIG. 3 holds a pile 22 by a chuck mechanism 4 as shown in FIG. 6 and a crane (not shown) via a hanger 24. The suspension ring 34 is suspended. Reference numeral 31 denotes a hydraulic hose for driving the hydraulic cylinder 23 of the chuck mechanism 4, which is connected to a hydraulic source via a hydraulic operating valve (not shown). Hanger 2
A plurality of (four in this example) shafts 25 are attached to the lower part 4. The shaft 25 is inserted through a bearing hole of a bearing bracket 26 fixed to the vibrating section 1, and a spring seat 27 is fixed to a lower end thereof. An upper spring 28 and a lower spring 29 are externally fitted to the shaft 25, and an upper spring 28 is provided between the hanger 24 and the bearing bracket 26, and a lower spring 29 is provided between the bearing bracket 26 and the spring seat 27. , Respectively, are compression interposed.

As described above, when the vibration generating unit 1 (specifically, the case of the vibration generating unit 1) is mounted on the hanger 24 via the elastic member, the crane (see FIG. Outside) (engaged with the suspension ring 34) is buffered. further,
If the hanger 24 is configured to have a large weight, the gravitational load of the hanger is superimposed on the pile driving load. Exciter 1
And an electric motor 2 rigidly coupled thereto
Even if vibrating violently, the hanger 24 buffered by the spring does not vibrate violently. Therefore, the power supply line 30 of the electric motor 2 is partially attached to the hanger 24 and then connected to a power supply (not shown).

[0013]

Although lubrication and cooling are necessary and important problems in all types of machinery, it is particularly difficult for electric rotary vibrators in terms of the conditions specific to vibrating machines for civil engineering work and the prevention of vibration pollution. Problem. As described previously for Fig. 5, during a until the rated state at time t ₁ after starting the operation at time t ₀ in the vibration pile construction, natural frequency n ₁ of the ground
Pass through. Similarly, the time when the electric motor was turned off
After R> t _2, passing through the natural frequency n ₁ of the ground in between times t ₃ when inertial rotation is stopped. Therefore, in order to prevent or reduce vibration pollution, it is desirable that the ground pass through the natural frequency n ₁ of the ground as quickly as possible. Referring to FIG. 5, it is desirable that the arrows c and d have a steep slope as close to vertical as possible.

Conventionally, the rotation speed rising curve arrow c at the start of operation has a steeper slope than the rotation speed falling curve arrow d at the time of operation stop, and passes through the natural frequency n ₁ of the ground in a short time. However, it was thought that there was not much problem, but with increasing public opinion about pollution, the criteria for the acceptance limit for vibration pollution have become severe. For this reason, it is necessary to increase the capacity of the electric motor so that the rotation speed increasing curve c shown in FIG. 5 rises more rapidly. As for the rotation speed decrease curve d at the time of operation stop, a technique of rapidly decelerating by providing a brake is becoming widespread. As described above, large-capacity electric motors have been used to prevent vibration pollution due to resonance at the start of operation, but as described below, large-capacity electric motors are also used to stabilize steady operation. It is necessary to use a motor. Considering the rotation speed-torque characteristic curve of the three-phase induction motor, for example, the curve shape is different depending on various models even when looking only at the cage type three-phase induction motor,
There is no flat characteristic curve like a DC machine. For this reason, in order to stabilize the steady operation curve e at the rated rotation speed shown in FIG. 5, a large-capacity three-phase induction motor having a sufficient margin torque must be used.

As described above, when the capacity of the electric motor of the electric rotary vibrator is increased, iron loss and copper loss in the electric motor increase, and a more effective cooling technique is required. Among the causes that require cooling of the electric motor, there are also the following problems peculiar to vibration pile driving work.
For example, when steel sheet piles are arranged and driven, a member (for example, a straight H-section steel) acting as a ruler is placed on the surface of the ground in order to accurately align the steel sheet piles, and the steel sheet pile is brought into contact with the ruler member. Cast in. For this reason, the top of the steel sheet pile protrudes several tens of centimeters above the ground when the driving is completed. The above protruding tops are driven one by one after removing the above-mentioned ruler member so that the tops are substantially aligned with the ground surface. The finishing time for this operation is 3-4 seconds per steel sheet pile. When performing the above-described finishing driving, the electric motor of the electric rotary vibrator repeatedly starts and stops in a short cycle. However, as a starting characteristic of the three-phase induction motor, the efficiency is extremely low for a short time immediately after the start, and a large amount of heat is generated. As described above, if the start and stop are repeated in a short cycle, the proportion of time in which the operation is performed in a state where the heat generation is large increases, and the necessity of cooling is further increased.

Various types of electric motor cooling have been developed and put to practical use, however, even for electric vibrators for tens to hundreds of kilowatts, such as electric vibrators for civil engineering construction work, free ventilation and controlled ventilation. There are two types: type, surface cooling type, and heat exchanger type, which are further subdivided and standardized (JEC-146). The details are well known, for example, from the Encyclopedia of Electrical and Electronics Engineering. However, the above-mentioned known technique cannot be arbitrarily applied to cooling of the electric motor for driving the electric rotary vibrator. The reason is as follows.

(A) Civil engineering work may be performed in rainy weather, or may be performed while splashing waves on the coast or on the sea. When the conditions are poor, salt may also enter, and there is a risk that the electric insulation of the electric motor may be reduced or corrosion may occur. For similar reasons,
The conventional technology cannot be directly applied to the management ventilation system. (B) As shown in FIG. 3, the electric motor 2 is rigidly connected to the case of the vibrating section 1 and receives severe vibration. Therefore, when the heat exchanger type cooling method according to the related art is applied to the electric motor, a trouble occurs due to insufficient vibration resistance of the heat exchanger.

Under the circumstances described above, in the electric rotary vibrator according to the prior art, the surface cooling type is exclusively used as shown by a chain line in FIG. That is, the fan 15 is fixed to the motor shaft 10 to allow air to flow as indicated by an arrow f. According to the conventional cooling technique shown in FIG. 3, the motor bearing 14 of the electric motor can be cooled, but the cooling of the stator 13 is indirect and insufficient.
Further, the cooling effect is hardly exerted on the rotor 12.
Further, in the prior art, no special consideration was given to the air cooling of the vibrating section 1. The rotary vibrator does not generate much windage heat of the eccentric weight, heat of meshing of the synchronous transmission gear, and heating of lubricating oil by the eccentric weight, but the vibrating part bearing rotates while receiving a large centrifugal load. Therefore, cooling of the vibrating portion bearing must be considered.
SUMMARY OF THE INVENTION It is an object of the present invention to effectively cool the stator and rotor of an electric motor without the risk of reducing the insulation of the electric motor or promoting corrosion under the working conditions of the civil engineering construction site. It is an object of the present invention to provide a practical cooling method of an electric rotary vibrator and a cooling device capable of cooling a bearing of a vibrating section.

[0019]

The basic principle of the present invention created to achieve the above object will be briefly described with reference to FIG. 1 corresponding to an embodiment of the present invention. An air compressor 16 is provided without being fixed to one vibration system formed by rigidly connecting the electric motor 2 and the vibrating unit 1 to the dehumidifier 17. To supply. In the present invention, the term "air compressor" is a general term for a device that sucks in the atmosphere and discharges it at a pressure higher than the atmospheric pressure, and is a broad concept including a so-called blower.

[0020] The constitution of the device of the present invention as a concrete structure based on the principle described above, as well as bearing against the excitation unit case by excitation portion bearing a rotary shaft fitted with eccentric weight,
An apparatus for cooling an electric rotary vibrator in which the rotary shaft is driven to rotate by an electric motor, comprising an air compressor that sucks in air, compresses and discharges the air, and a dehumidifier connected to a discharge port of the air compressor. And an air flow path for blowing air, which communicates the dehumidifier, the electric motor, and the vibrating section case, is formed.

[0021] Ru good to the cooling device of the present invention described above,
Since the compressed air discharged from the air compressor passes through the dehumidifier and becomes dry air, there is no danger that even if the compressed air is circulated in the electric motor, the electric motor is moistened and the electric insulation is reduced. The same effect can be obtained by using a dehumidifier of the type that condenses and removes water vapor contained by cooling air as the above dehumidifier, or a dehumidifier of the type that makes contact with a substance that absorbs or adsorbs moisture. Can be Although the electric motor is coupled to the vibrator and the rigid and vibrates violently, the air compressor and the dehumidifier do not need to be rigidly coupled to the vibrator and the electric motor, and a flexible air flow is provided. Since it is sufficient to communicate with the road, there is no possibility that the cooling device is damaged by vibration. Among the conventional technologies related to electric motor cooling, the present invention solves the technical difficulties that the heat exchanger type cooling system, which has no risk of introducing moisture into the electric motor, could not be applied to a vibrator due to insufficient vibration resistance. Can be solved by a novel technique of supplying dry air from outside the vibration system including the vibration unit and the electric motor as described above. The importance of cooling in an electric rotary vibrator, that is, the degree of severe thermal conditions, is generally based on an electric motor and on a vibrator.
According to such a situation, the dry air discharged from the dehumidifier of the present invention is allowed to flow in series in the order of the importance, or in parallel with the flow distribution according to the importance, so that it is suitable as an electric rotary vibrator. Cooling can be performed.

[0022]

Figure 1 DETAILED DESCRIPTION OF THE INVENTION shows an embodiment of the engagement Ru equipment in the present invention, is a schematic explanatory view are indicated by the cooling system in a vertical cross-sectional view of the excitation portion and the electric motor. The present embodiment is an example in which the present invention is applied to the conventional example shown in FIG. 3 and is improved. The components denoted by the same reference numerals as those in FIG. 3 are the same or similar components as those in the conventional example. . In this embodiment, a blower is used as the air compressor 16. A blower generally refers to a low-pressure, large-flow air compressor. The outlet of the air compressor 16 is connected to the inlet of the dehumidifier 17, and the outlet of the dehumidifier is connected to the air hose 35. The air flow path formed by the air hose 35 is branched at a point g shown in FIG.
And cooled by bringing them into contact with the rotor 12 and the stator 13. A part of the air flow branched at the point g is divided into the vibrating portion bearings 7a and 7 as indicated by arrows i and i '.
b to cool these bearings. 19 is a duct for guiding air. Reference numeral 18 denotes a breather connected to the suction port of the air compressor 16.

In practicing the present invention, it is desirable to use a breather having a dustproof function or to use a filter in combination.

In this embodiment, as a combination device of the air compressor 16 and the dehumidifier 17, the Iwata compressor RDA-53 manufactured by Iwata Coating Machine Industry Co., Ltd. is used.
An E-type (trade name) refrigeration air dryer was used. The exciter electric motor 2 of the present embodiment is 60 Ps,
On the other hand, the main specifications of the air dryer are as follows. Dimensions: 300 × 350 × 900 (mm) Weight: 47 kg Electric motor: 50 Hz-0.24 kW (60 Hz-
0.28 kW) Processing air volume: 0.74 cubic meter / min (at 7 kgf)
/ Cm ² ) Outlet air dew point: 10 degrees Celsius (under pressure) Maximum operating pressure: 9.9 kgf / cm ² The dehumidification function part of the above Iwata compressor RDA condenses water vapor by cooling air with a refrigerator. It is a method of removing.

When a refrigeration type dehumidifier is used as in this embodiment, the supplied compressed air is low in humidity, which is convenient for cooling the electric motor and the vibrating section bearing. However, when carrying out the present invention, a moisture adsorption type dehumidifier or a moisture absorption type dehumidifier can be used. Known devices can be appropriately selected and used for these moisture adsorption type and moisture absorption type dehumidifiers, but they must have an easily replaceable structure such as a cartridge type absorbent or absorbent. ,
Alternatively, it is desirable that the adsorbent and the absorbent have a structure capable of regeneration.

In the present embodiment, the air compressor 16 and the dehumidifier 17 are mounted on a hanger 24 (see FIG. 6). Since the hanger 24 is originally a component that desirably has a suitable inertia,
Even if a kilogram air dryer (combined equipment of an air compressor and a dehumidifier) is installed, no particular problem occurs. Since the hanger 24 is elastically supported by the vibrator 1 via an upper spring 28 and a lower spring 29, which are elastic members for vibration isolation, an air compressor and a dehumidifier are mounted on the hanger 24. However, there is no possibility that any other trouble will occur with respect to the vibration resistance of these cooling components. As an embodiment different from the above, the air compressor 16 and the dehumidifier 17 (see FIG. 1) may be mounted on the vibration unit 1 or the electric motor 2 via an elastic member (not shown) for vibration isolation. it can.

Further, the air compressor 16 and the dehumidifier 17 are combined to form a portable air dryer, which is installed on the ground or on a work boat, and the dry air is supplied to the electric motor 2 and the air motor 2 by an air hose. It is also possible to guide to the vibrating portion bearings 7a and 7b. Since the rotary vibrator for civil engineering is not a fixed facility but a mobile device, the air dryer is desirably portable.

[0028]

FIG. 2 shows an example of an embodiment different from the embodiment shown in FIG. 1 described above. A cross-sectional view of a vibrating section and an electric motor shows a system diagram of a cooling system including an air compressor and a dehumidifier. FIG. The total flow rate of the dry compressed air sent from the dehumidifier 17 is determined by the air hose 3.
6, the electric motor 2 is guided into the electric motor 2 as indicated by an arrow j, and is caused to flow as indicated by an arrow k while being brought into contact with the rotor 12 and the stator 13, and then branched at a point m to be raised as indicated by arrows n and n '. It is guided to the vicinity of the vibrating part bearings 7a and 7b, and is cooled and then released into the atmosphere. According to the present embodiment (FIG. 2), the electric motor 2 which is severe under thermal conditions is preferentially cooled, and the excessive cooling heat causes the vibrating portion bearings 7a, 7 to be cooled.
It is reasonable to be able to cool b.

[0030]

Being use a cooling device of the present invention, since the dry air passes through the compressed air is dehumidifier discharged from the air compressor, the electric motor be allowed to flow through it into the electric motor There is no danger of damaging the electrical insulation by wetting. The same effect can be obtained by using a dehumidifier of the type that condenses and removes water vapor contained by cooling air as the above dehumidifier, or a dehumidifier of the type that makes contact with a substance that absorbs or adsorbs moisture. Can be
Although the electric motor is rigidly coupled to the vibrating section and the rigid, the air compressor and the dehumidifier do not need to be rigidly coupled to the vibrating section and the electric motor. Since it is sufficient to communicate with the road, there is no possibility that the cooling device is damaged by vibration. Among the conventional technologies related to electric motor cooling, the present invention solves the technical difficulties that the heat exchanger type cooling system, which has no risk of introducing moisture into the electric motor, could not be applied to a vibrator due to insufficient vibration resistance. Can be solved by a novel technique of supplying dry air from outside the vibration system including the vibration unit and the electric motor as described above. The importance of cooling in an electric rotary vibrator, that is, the degree of severe thermal conditions, is generally based on an electric motor and on a vibrator. According to such a situation, the dry air discharged from the dehumidifier of the present invention is allowed to flow in series in the order of the importance, or in parallel with the flow distribution according to the importance, so that it is suitable as an electric rotary vibrator. Cooling can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of the device of the present invention, in which a cooling system is added to a vertical cross-sectional view of a vibration unit and an electric motor.

FIG. 2 shows an example of an embodiment different from the embodiment shown in FIG. 1 described above, in which a sectional view of a vibrating section and an electric motor is additionally provided with a system diagram of a cooling system including an air compressor and a dehumidifier. FIG.

FIG. 3 is a schematic vertical sectional view showing a conventional electric rotary vibrator. However, it is schematically drawn for easy understanding of the structure and function, and is not necessarily a realistic projection view.

FIG. 4 is a schematic diagram for explaining vibration pollution in a pile driving operation.

FIG. 5 is a chart showing a change in frequency at the time of starting operation and at the time of stopping operation of the vibration device, and the horizontal axis is time.

FIG. 6 is a partially cutaway side view of the conventional electric rotary vibrator and its supporting mechanism shown in FIG. 3 when viewed from a direction perpendicular to FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Exciting part, 2 ... Electric motor, 3 ... Transmission mechanism, 4 ... Chuck mechanism, 5 ... Crane boom, 5 '... Rotating shaft, 6 ...
Vibration device, 6 ': Eccentric weight, 7: Pile, 7a, 7b: Vibration section bearing, 8: Private house, 8': Synchronous transmission gear, 9: Driven pulley, 10: Motor shaft, 11: Drive pulley, 12 ... rotor, 13 ... stator, 14 ... motor bearing, 15 ... fan, 16 ... air compressor, 17 ... dehumidifier, 18
... breather, 19, 20, 21 ... air duct, 23 ...
Hydraulic cylinder, 24 ... hanger, 25 ... shaft, 2
6 ... bearing bracket, 27 ... spring seat, 28 ... upper spring, 29 ... lower spring, 30 ... power supply line, 31 ...
Hydraulic hose, 32: Exciter case, 33: Motor casing, 34: Suspension ring, 35, 36: Air hose.

Claims (6)

(57) [Claims] A rotating shaft having an eccentric weight attached thereto;
In addition to supporting the exciter case by receiving
Electric rotor with a rotating shaft driven by an electric motor
Air compressor that inhales, compresses, and discharges the air in a device that cools the revibrator
And connected to the outlet of the above air compressor
A dehumidifier is provided, and the dehumidifier, the electric motor, and the vibration unit case are communicated with each other.
A cooling device for an electric rotary vibrator, wherein an air flow path for blowing air is formed . 2. The dehumidifier reduces the temperature of the refrigerant.
Means that the heat exchange between the air and the compressed refrigerant temperature drops
And the steam contained in the compressed air is cooled and condensed.
2. The cooling device for an electric rotary vibrator according to claim 1 , further comprising means for discharging the bound water droplets . 3. The dehumidifier is provided in a flow path of compressed air.
If a moisture absorbent or moisture adsorbent is
In addition, the above-mentioned moisture absorbent or moisture absorbent can be replaced.
Yes, or the moisture absorbent or moisture adsorbent is water
2. The cooling device for an electric rotary vibrator according to claim 1 , wherein the absorption and absorption performance can be recovered and reused . 4. The air delivered from the dehumidifier is supplied to an electric motor.
The air flow path leading into the motor and the air flowing through the electric motor
An air flow path to flow out, and an air flow from the electric motor to the vibrating section shaft.
The cooling device for an electric rotary vibrator according to claim 1 , further comprising: an air flow passage that guides the vicinity of the receiver . 5. A method for diverting air sent from a dehumidifier.
The branch air flow path and one of the branched air
Air flow path to the air, rotor and fixed air flowing into the electric motor
Contact and flow to the outside of the electric motor
The air flow path to be released into the atmosphere and the other of the branched air are guided to the vibration unit case.
Characterized in that it comprises an air flow passage allowed to flow the excitation portion near the bearing, the cooling apparatus for an electric rotary vibrator according to claim 1. 6. An electric motor and a vibrating section case,
These electric motors are rigidly fixed to each other
Air compressor and the exciter case
Sensor and dehumidifier are attached via elastic members.
The cooling device for an electric rotary vibrator according to claim 1 , wherein the cooling device is mounted on a member connected via an elastic member .