JP3032466B2 - Compactor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compactor used for compacting roads and trench bottoms.

[0002]

2. Description of the Related Art Conventionally, an engine is used to drive a compactor of this type. However, since the engine has a large noise and air pollution due to the exhaust gas cannot be avoided, a motor driven by a motor has been proposed. For example, a motor using a high-frequency motor has been proposed.
No.-39282)), the idea of this invention is 200 Hz or 240 Hz.
The motor is driven by a constant output power supply of 48 Hz at 48 Hz.

[0003]

The conventional compactor is:
The frequency of the motor-driven motor as well as the motor-driven motor using the high-frequency motor has been determined to a constant value.
The frequency is set to a value that allows efficient work in ordinary road construction and the like. That is, the frequency of the engine type compactor is 4,000 vp
m to 6,000 vpm, and is fixed to a constant value within a range of about 6,000 vpm.
It is fixed to 7,200 vpm corresponding to Hz.

[0004] In recent years, in response to environmental problems,
There is a strong demand for a quiet working environment. Even if the above-mentioned conventional compactor is an electric type compactor, it is not suitable for night work because the noise is large when the frequency is large, and consequently the night compaction work cannot be practically performed outside the city center. Therefore, there is a demand for a compactor capable of performing both a compaction work in which the efficiency is emphasized in the daytime where a certain level of noise is allowed and a compaction work in which the emphasis is on quietness at the expense of nighttime efficiency.

[0005] In recent years, pavement means have been diversified, and various finishing materials such as tiles, bricks and concrete blocks have been used for surface finishing. When these finishing materials are used, it is necessary to increase or decrease the rolling pressure depending on the material. For example, in a rolling work after laying a tile, if the rolling pressure of the compactor is large, the tile may be damaged. In other words, the ground rolls strongly,
For the compaction of the surface finishing material, it is desirable to compact the surface with the strength (for example, the tile is weak) according to the material. A compactor capable of performing both strong compaction and weak compaction is desired.

[0006]

According to the present invention, in a compactor in which a vibration motor is installed on a base and a pressure plate is mounted below the base, the vibration motor is controlled by an inverter having a variable output frequency. Things. The output variable range of the inverter is suitably 100 Hz or more. Up to 100 Hz, resonance was likely to occur, and satisfactory rolling capacity was not obtained. Note that the inverter output may be changed to 100 Hz or less in the design of the control circuit using the inverter. The upper limit of the output frequency is not particularly limited, and is appropriately designed in consideration of the rolling efficiency. In order to obtain the highest possible compaction efficiency even at a low frequency, the centrifugal force of the vibration motor is preferably 200 kgf or more at a frequency of 3,000 vpm in the case of a compactor of 60 kg class. . Further, when an elastic plate is attached to the lower surface of the rolling plate, noise is reduced. The operability is good when the inverter is housed in an inverter box attached to a handle attached to a base via vibration-proof rubber, and an operation switch is arranged on the upper surface of the inverter box.

[0007]

In the present invention, when the output frequency of the inverter is increased or decreased, the frequency of the vibration motor is increased or decreased in accordance with the frequency. Generally, in a vibration motor having a constant mass moment, when the frequency of the motor is low, the working noise is low and the rolling pressure is low. Conversely, when the frequency of the motor is high, the working noise is high and the rolling pressure is high. Therefore, in the work where emphasis is placed on daytime efficiency and the work of compacting pavement ground, the output frequency of the inverter is increased and the frequency of the motor is set to a large value. In the work of compacting finish materials, the output frequency of the inverter is lowered and the frequency of the motor is set low,
The above problem can be solved. When the elastic plate on the lower surface of the pressure-compacting plate is attached, the elastic plate exerts a sound-muffling effect, which is particularly effective in nighttime work.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a vibration motor 2 is provided on a base 1, and the vibration motor 2 is covered with a cover 3. A pressure plate 4 is attached to a lower portion of the base 1, and an elastic plate (for example, a rubber plate) 5 is detachably layered on a lower surface of the pressure plate 4 by bolts or the like. A base end of a handle 6 is rotatably attached to the base 1, and an inverter box 7 is attached to the handle 6 via a vibration-proof rubber, and the vibration motor 2 is controlled in the inverter box 7. The inverter 8 is housed, and the upper surface of the inverter box 7 is an operation panel 9 on which operation switches are arranged.

The inverter 8 outputs AC 100 V as AC 80 V, and outputs 50 Hz or 60 H
z is converted to an arbitrary frequency between 100 Hz and 260 Hz and output. The vibration motor 2 has an unbalanced weight attached to the output shaft of the motor, and has a centrifugal force of about 200 kgf and a centrifugal force of about 3 G at a frequency of 3,000 vpm corresponding to 100 Hz which is the minimum output frequency of the inverter 8. Acceleration is obtained and the frequency 7,800 vpm corresponding to the maximum output frequency of 260 Hz
In this case, a centrifugal force of about 1,400 kgf and an acceleration of about 23 G can be obtained.

On the operation panel 9, a frequency adjustment dial 10, a forward / reverse changeover switch 11, and a main switch 12 for controlling ON / OFF are arranged. The frequency adjustment dial 10 adjusts the frequency of the vibration motor 2 by changing the output frequency of the inverter 8, and can be set to an arbitrary frequency, that is, an arbitrary rotation speed. The forward / reverse switch 11 switches the rotational direction of the vibration motor 2 to set the traveling direction of the compactor.

[0011]

According to the present invention, the following effects can be obtained. First, since a vibration motor is used as the driving force of the compactor, noise during operation can be reduced as compared with an engine type. Second, because the vibration motor was controlled by an inverter with variable output frequency,
The frequency of the vibration motor, and thus the frequency of the rolling plate, can be arbitrarily increased or decreased. Therefore, when working efficiency is important, a high frequency is selected and the frequency of the pressure plate is set to be large, and when noise prevention is important, a low frequency is selected and the frequency of the pressure plate is set to be small. In addition, operating conditions can be appropriately set in consideration of efficiency and noise. When the output frequency of the inverter is set low, the work efficiency is not high, but it is quiet, and the effect of being able to work at night is great. Third, since the vibration motor is controlled by the inverter having a variable output frequency, the vibration frequency of the vibration motor, that is, the centrifugal force of the vibration motor can be arbitrarily increased or decreased. Therefore, when a high rolling pressure is required, a high frequency is selected to increase the centrifugal force and the rolling pressure, and conversely, when a weak rolling pressure such as a tile is preferable, a low frequency is selected to select the centrifugal force and the rolling pressure. The operating conditions suitable for the compaction conditions can be appropriately set, for example, by setting the pressure to be small. Further, by adjusting the angle of the eccentric weight of the vibration motor, the combination of the vibration frequency, the centrifugal force, and the rolling pressure can be appropriately set.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is an enlarged view of the operation panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Vibration motor 3 Cover 4 Pressure plate 5 Elastic plate 6 Handle 7 Inverter box 8 Inverter 9 Operation panel 10 Frequency adjustment dial 11 Forward / reverse switching switch 12 Main switch

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-127016 (JP, A) JP 4-39282 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E01C 19/34

Claims (4)

(57) [Claims] 1. A compactor having a vibration motor mounted on a base and a pressure plate mounted below the base, wherein the vibration motor has a variable frequency range of 100 Hz or more.
Frequency of the vibration motor by an inverter having and far
Compactor that controls to change the mental strength 2. The compactor according to claim 1, wherein the centrifugal force of the vibration motor is 200 kgf or more at a vibration frequency of 3,000 vpm in a compactor of a 60 kg class. 3. The rolling plate has an elastic plate mounted on a lower surface thereof.
The compactor according to claim 1. 4. The inverter according to claim 1, wherein the inverter is housed in an inverter box attached to a handle attached to the base, and an operation switch is disposed on an upper surface of the casing.
The compactor according to any one of claims 1 to 3,