JPH01274972A - Vibrating tool - Google Patents

Abstract

PURPOSE:To reduce the vibration of a handle to easily guar an operator by synchronizing the vibration of a bit with the vibration of a vibration generating unit, and setting the phase difference of these vibrations at about 180 degrees. CONSTITUTION:A vibration generating unit 11 for generating vibration in the same axis direction as the vibration of a bit 2 due to an electric motor 5 is provided in a portion being made integrally with a handle. The vibration generated by the vibration generating unit 11 is brought into synchronism with the vibration generated by the bit 2 by means of a synchronous circuit 8. Further, the vibration generated by the bit 2 is negated by setting the phase difference of these vibrations at about 180 degrees, the transmission of vibration to the handle is avoided, and the operator does not perceive vibration. The use of the vibrating tool for many hours does not cause physical disorder of the operator.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibrating tool that generates vibrations in a bit by converting rotation of an electric motor into reciprocating motion.

E. Prior Art] A vibrating tool is used for drilling or crushing a hard member such as concrete, and applies a strong impact to a bit, generating vibrations in the bit.

As a result, severe vibrations are generated not only in the bit but also in the tool itself that strikes the bit due to the reaction force.

``The vibration of such a vibrating tool is constructed so that the vibration is not transmitted to the operator's hand by interposing a buffer member in the handle, etc. that grips the vibrating tool.

[Problems to be Solved by the Invention] However, even if the handle is provided with a vibration-absorbing II structure member, there is a limit to vibration absorption, and the operator cannot be easily protected.

For this reason, in long-duration work, it was necessary to change workers, which resulted in restrictions on long-duration work.

In view of these circumstances, the present invention was made with a focus on eliminating the vibrations generated by the impact of the bit with other vibrations, and it is possible to reduce the vibrations and protect the worker. The purpose of the present invention is to provide a vibrating tool that does not cause any trouble during long hours of operation.

[Means for Solving the Problems] The present invention includes a vibration generating section that generates vibration in the same axial direction as the vibration of the bit in a portion that is substantially integrated with the handle, and the vibration of the vibration generating section is The problem was solved by synchronizing the vibrations of and and y and further setting the phase difference between the S motion of this vibration generating part and the vibration caused by the bit to be approximately 180 degrees, so that the vibration of the handle was substantially reduced. points are resolved.

[Operation] When the vibrations generated by the vibration generator are synchronized with the vibrations generated by the bit and the vibration directions are out of phase by 180 degrees, the vibrations generated by the bit are canceled out and eliminated.

If the vibrations caused by the impact of the bit are canceled out and the vibrations are not transmitted to the handle, the vibrations will not be felt by the operator and will not cause any trouble to the operator due to long-term use.

[Example] The present invention will be explained based on an example shown in the drawings. Fig. 1 is a configuration diagram of a vibrating tool showing an example of the present invention, and Fig. 2 shows the main points thereof. FIG.

In FIG. 1, the vibrating tool is equipped with a bit 2 at the front of a frame 1, and this bit 2 is struck in the axial direction by a striking body 3, and the tip of the bit 2 is used to punch or punch a workpiece such as concrete. , configured to crush.

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

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

Furthermore, the electric motor 5 is equipped with an encoder 6,
It is configured so that the rotation speed can be detected.

Further, the encoder 6 is 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.
is connected to a vibration generator 11 fixed to the frame 1.

The rotation speed detection circuit 7 detects the rotation speed of the electric fi 5 based on the signal from the encoder 5, 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 from the rotation speed detection circuit 7 by the synchronization circuit 8.

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

The vibration generating section 11 generates vibration in the same axial direction as the bit 2, and is configured to vibrate in response to a 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, and a vibrating body 13 attracted by an electromagnet 12' and the magnetic action of the electromagnet 12 is attached to spring members 14a, 14b. It is provided by intervening.

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

With such a configuration, when the electric motor 5 rotates, the vibrating tool hits the bit 2 with the impacting body 3, and the bit 2 applies vibration to a workpiece such as concrete, thereby performing processing operations such as drilling.

When the bit 2 hits concrete, etc., a reaction force is generated as vibration in the opposite direction of the impact, and the frame 1
vibrate.

Therefore, when a signal is sent from the drive circuit 10 to the vibration generating section 11, vibration is generated by the signal, and the vibration is generated by energizing the electromagnet 12, which causes the vibrating body 13 to
It is carried out in the direction shown by arrows 15a and 15b while being held at 14b.

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

In such synchronization and setting, the rotation speed of the electric motor is mechanically related to the impact of the bit 2, so the rotation speed of the electric motor 815 is detected by the rotation speed detection circuit 7, and the rotation speed of the electric motor 815 is detected by the oscillation circuit 9 by the synchronization circuit 8. By synchronizing, it is possible to easily synchronize with the vibration of the bit 2, and it is easy to do.

The drive circuit 10 only needs to supply the electromagnet 12 with a power source with a frequency synchronized with the vibration frequency of the bit 2, and it is preferable that the vibration energy of the electromagnet 12 is equal to the vibration energy of the frame 1 generated by the impact of the bit 2. ,
It is sufficient that the vibration of the frame 1 is substantially reduced so that the vibration is not felt by the operator, and it is possible to obtain it experimentally.

[Effects of the Invention] According to the present invention, it is possible to obtain a vibrating tool that can reduce vibration and protect workers, and that does not cause trouble during long-time work, and the effect is extremely large. It is something.

[Brief explanation of the drawing]

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 the main parts thereof. DESCRIPTION OF SYMBOLS 1... Frame, 2... Bit, 3... Hit 91k, 4... Buffer member, 5... Electric motor, 6.
... Control circuit, 7... Rotation speed detection circuit, 8... Synchronous circuit, 9... Oscillation circuit, 10... Drive circuit,
11... Vibration generating section.

Claims (1)

[Claims] A vibrating tool that converts the rotation of an electric motor into reciprocating motion to generate vibrations in the bit, is equipped with a vibration generating part that generates vibrations in the same axial direction as the bit vibrations in a part that is substantially integrated with the handle. The vibration of the vibration generator is synchronized with the vibration of the bit, and the phase difference between the vibration of the vibration generator and the vibration of the bit is set to approximately 180°, so that the vibration of the handle is substantially reduced. A vibrating tool featuring: