JP2683910B2 - Vibrating tool - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vibrating tool for converting rotation of an electric motor into reciprocating motion to generate vibration in a bit.

[Prior Art] A vibrating tool is one for punching or crushing a hard member such as concrete, and gives a strong impact to the bit to generate vibration in the bit. Therefore, not only the bit but also the tool itself that strikes the bit is violently vibrated by the reaction force.

Such vibration of the vibrating tool is configured so that the vibration is not transmitted to the hand of the operator by interposing a cushioning member in a handle or the like that holds the vibrating tool.

[Problems to be Solved by the Invention] However, even if a cushioning member that absorbs vibration is provided in the handle, there is a limit to absorption of vibration, and it is not possible to easily protect the operator.

For this reason, in the work for a long time, the worker has to be changed, and the work for a long time is limited.

In view of such circumstances, the present invention has been made by paying attention to eliminating the vibration generated by the impact of the bit by another vibration, and the vibration can be reduced to protect the worker. It is an object of the present invention to provide a vibrating tool that does not cause troubles due to long-time work.

[Means for Solving the Problems] The present invention relates to a vibrating tool that converts the rotation of an electric motor into reciprocating motion to generate vibration in a bit, and is synchronized with an encoder that detects the rotational speed of the electric motor and a rotational speed detection circuit. A control circuit including a circuit, an oscillation circuit, and a drive circuit; and a vibration generator that is controlled by the control circuit and generates vibration in the same axial direction as the vibration of the bit. The problem is solved by synchronizing with the vibration of the bit, setting the phase difference between the vibration of the vibration generating part and the vibration of the bit to approximately 180 °, and reducing the vibration of the handle part. .

[Operation] The vibration generated by the vibration generator is synchronized with the vibration generated by the bit, and when the vibration directions are 180 ° out of phase with each other, the vibration generated by the bit is offset and eliminated.

If the vibration due to the impact of the bit is canceled and the vibration does not reach the handle, the worker does not feel the vibration, and the worker is not hindered by the use for a long time.

[Embodiment] The present invention will be described based on one embodiment shown in the drawings. Fig. 1 is a configuration diagram of a vibrating tool showing one embodiment of the present invention, and Fig. 2 is a schematic diagram thereof. It is a longitudinal cross-sectional view of a part.

In FIG. 1, the vibrating tool is provided with a bit 2 in the front part of a frame 1, and the bit 2 is struck in the axial direction by an impacting body 3 to pierce or crush a processed member such as concrete at the tip. Is configured to.

The striking body 3 is provided with a piston and a striking element inside a cylinder, and the striking element moves by the air pressure that fluctuates when the piston operates, and strikes the hole end portion of the bit 2.

The striking body 3 is not firmly attached to the frame 1 but is held by the frame 1 via the cushioning member 4, and the striking body 3 has the electric motor 5 inside the frame 1.
It is connected to.

Further, the electric motor 5 is provided with an encoder,
It is configured so that the number of rotations can be detected.

 The encoder is also connected to the control circuit 6.

The control circuit 6 includes a rotation speed detection circuit 7, a synchronization circuit 8, an oscillation circuit 9 and a drive circuit 10, and the drive circuit 10
Are connected to the vibration generator 11 fixed to the frame 1.

The rotation speed detection circuit 7 detects the rotation speed of the electric motor 5 based on a signal from the encoder, and is configured to send an input signal to the synchronization circuit 8.

Further, the oscillation circuit 9 oscillates at a frequency close to the vibration of the bit 2, and is configured to be synchronized with the signal of the rotation speed detection circuit 7 by the periodic circuit 8.

The oscillator circuit 9 is configured to send a signal to the drive circuit 10 and operate the drive circuit 10 at the oscillation frequency to drive the vibration generator 11.

The vibration generator 11 generates vibration in the same axial direction as the bit 2, and is configured to vibrate with the signal given from the drive circuit 10 to vibrate the frame 1.

In FIG. 2, the vibration generating circuit 11 is formed in a ring shape and is attached inside the frame 1.
A vibrating body that is attracted by the magnetic action of 12 and this electromagnet 12.
13 is provided with spring members 14a and 14b interposed.

Arrows 15a and 15b in the figure indicate the vibration directions of the vibrating body 13.

With such a configuration, when the electric motor 5 rotates, the impact tool 3 impacts the bit 2 to vibrate a machining member such as concrete with the bit 2 to perform a machining operation such as drilling.

Then, in the bit 2, a reaction force of hitting concrete or the like is generated as vibration in the direction opposite to the hitting, and vibrates the frame 1.

Therefore, when a signal is sent from the drive circuit 10 to the vibration generator 11, the signal causes vibration, and the vibration is generated by the electromagnet.
When the vibrating body 13 is held by the spring members 14a and 14b by energizing 12, the vibration is performed in the directions indicated by the arrows 15a and 15b.

The vibration frequency of the vibration generator 11 is determined by the drive circuit 10. When the vibration that is synchronized with the vibration of the bit 2 and has a phase difference of 180 ° is adjusted and set, the vibration of the frame 1 Vibration disappears.

For such synchronization and settings, the number of rotations of the motor is bit 2
Since it is mechanically related to the impact of the
By detecting the rotation speed of the electric motor 5 and synchronizing it with the oscillation circuit 9 by the synchronizing circuit 8, it is possible to easily synchronize with the vibration of the bit 2.

The phase of the vibration of the vibration generator 11 with respect to the vibration of the bit 2 can be easily set by the drive circuit 10.

The drive circuit 10 may be a power source having a frequency synchronized with the vibration frequency of the bit 2 in the electromagnet 12, and the vibration energy of the electromagnet 12 is preferably equal to the vibration energy of the frame 1 generated by the impact of the bit 2. It suffices that the vibration of the frame 1 is substantially reduced so that the operator does not feel the vibration, and it can be experimentally obtained.

[Effects of the Invention] According to the present invention, it is possible to obtain a vibrating tool that can reduce vibration and protect an operator and that does not cause a failure due to long-term work, and the effect is extremely large. It is a thing.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a vibrating tool showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a main part thereof. 1 …… frame, 2 …… bit, 3 …… striking body, 4 ……
Cushioning member, 5 ... Electric motor, 6 ... Control circuit, 7 ... Rotation speed detection circuit, 8 ... Synchronous circuit, 9 ... Oscillation circuit, 10 ...
Drive circuit, 11 ... Vibration generator.

Claims (1)

(57) [Claims] 1. A vibrating tool for converting rotation of an electric motor into reciprocating motion to generate vibration in a bit, comprising: an encoder for detecting the rotational speed of the electric motor; a rotational speed detecting circuit; a synchronizing circuit; an oscillating circuit; and a driving circuit. A control circuit configured, and a vibration generation unit that is controlled by the control circuit and generates vibration in the same axial direction as the vibration of the bit, synchronizes the vibration of the vibration generation unit with the vibration of the bit,
A vibrating tool characterized in that a phase difference between the vibration of the vibration generating portion and the vibration of the bit is set to about 180 ° so that the vibration of the handle portion is reduced.