JPH0710448B2 - Beveling device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a structure of a beveling device configured to bevel or cut a pipe by a bevel blade that rotates the outer circumference of a fixed pipe. .

[Prior Art] A groove device is configured to rotate or cut a groove along the outer periphery of a fixed pipe to cut or groove the pipe. The operator visually confirmed that the pipe was rotated once to go around the outer circumference of the pipe.

On the other hand, the larger the diameter of the pipe, the larger the groove device, and the motor for driving the groove blade must also have a large output.

In such an example, the rotating portion becomes large like the pipe tip groove processing device described in JP-A-54-49698, and a large force is required to feed the groove blade.

Due to such a problem, when a pipe having a large diameter is to be grooved or cut, a pipe that can be automatically fed using power of an electric motor or the like is preferred.

[Problems to be Solved by the Invention] However, when the bevel blade is rotated once along the outer circumference of the pipe by automatic feeding, it must be accurately returned to the start position of rotation, and even if it is returned correctly, it will not open. It was inconvenient because a slight processing residue of the groove was generated on the front surface.

Therefore, a method has been tried in which it is configured to rotate beyond the start position of rotation, and the groove blade is returned to the start position of rotation by reverse rotation, and the effect has been obtained.

However, if a limit switch is provided to detect such a position of the rotating portion in order to achieve such a method, the limit switch often breaks down.

Such limit switch failures often occur due to adverse conditions such as the use of cutting oil in the bevel blade and the scattering of cutting debris.To prevent these from being affected, protect the rubber etc. It is possible to cover it with a member,
Since a buffer member is interposed as the limit switch, there arises a problem that the accuracy of operation deteriorates.

Also, setting the rotation time with a timer is an example of a simple method, but because the rotation speed of the electric motor changes due to voltage fluctuations and the rotation speed changes depending on the load, a constant machining is always guaranteed. I had a problem that I could not.

In order to solve such a problem, it is necessary to configure the processing so as to greatly exceed the position at which the rotation is started, and to perform the reverse rotation correspondingly, which causes a problem that the processing efficiency is deteriorated.

Further, the method of changing the rotation speed when the angle is set by the timer cannot be adopted, which is extremely inconvenient when it is desired to change the processing speed by exchanging pipes or groove blades made of different materials.

The present invention has been made in view of such circumstances,
By calculating the rotation angle of the electric motor that drives the rotation of the groove blade and setting the rotation angle, it is possible to obtain a groove device that automatically and efficiently operates even a pipe with a large diameter to accurately perform the groove processing. It is an issue.

[Means for Solving the Problem] The present invention includes an arithmetic circuit that detects the rotation speed of an electric motor that drives the rotation of a bevel blade and obtains the rotation angle. A control circuit is provided for generating a reverse rotation signal by the arithmetic circuit when the position slightly exceeds 360 degrees from the starting position, and the reverse rotation signal causes the electric motor to reversely rotate, and the reverse rotation signal causes the control circuit to cross the electric motor somewhat. The problem is solved by reversing the amount by a certain amount and returning the groove edge to the rotation start position.

[Operation] When the bevel blade rotates, a rotation angle is calculated from the number of rotations of the electric motor, and a reverse rotation signal is generated at a position slightly exceeding 360 degrees from the rotation start position.

Then, when the reverse rotation signal is generated, the control circuit reverses the rotation of the electric motor by an amount slightly exceeding the rotation start position,
It is returned from the rotation start position to the position rotated 360 degrees, and the position in the rotation direction of the bevel blade is set to the initial state.

[Example] The present invention will be described based on an example shown in the drawings.
FIG. 1 is a diagram showing a structure of a groove device according to the present invention, and FIG. 2 is a diagram showing an outline of a structure of the groove device,
FIG. 3 is a diagram showing a state of acting on the pipe,
FIG. 4 is a diagram showing the relationship between the pipe and the groove blade.

In FIG. 1, the groove device is provided with a detector 2 for detecting the number of rotations of an electric motor 1 provided for rotating a groove blade.

The output of the detector 2 is transmitted as a pulse to the pulse counter 3. The setting circuit 4 is connected to the pulse counter 3 and the angle of the bevel blade exceeds 360 degrees. It is configured to set the number of pulses, and the pulse counter 3 and the reverse rotation signal generation circuit 5 constitute an arithmetic circuit.

Since this arithmetic circuit is composed of the pulse counter 3 and the reverse rotation signal generation circuit 5, when the number of pulses set by the setting circuit 4 is counted, the reverse rotation signal generation circuit 5 outputs a reverse rotation signal to the control circuit 6. It is configured.

The pulse count of the pulse counter 3 may be configured to count down from the number of pulses set by the normal setting circuit 4, and a reverse rotation signal may be issued to the control circuit 6 when it reaches 0. Of course, it may be configured to count up to the set number of pulses, and the conventional technique is sufficient for such a circuit configuration.

In addition, it is common sense that the setting circuit 4 sets the number of pulses to a display converted into a rotation angle or to display an angle slightly exceeding 360 degrees, and should be set using a digital counter or the like. Is what you can do.

Further, the output of the pulse counter 3 is connected to the control circuit 6 of the electric motor 1 via the reverse rotation signal generation circuit 5,
Is configured to rotate in reverse or forward.

In order for the control circuit 6 to rotate the electric motor 1 forward or backward,
This can be easily configured by forming a circuit that is inverted by a positive / negative relay of the power source of the electric motor 1.

In FIG. 2, the groove device is configured so that the pipe 8 is fixed to the vice 7, and the groove blade 9 is configured to act on the pipe 8. It is configured to rotate along the outer circumference of the pipe 8.

The rotating body 10 is rotated by the electric motor 1 via the bearing 11.

Further, the rotating body 11 has an electric motor 12 for rotating the groove blade 9.
Is provided, and the groove blade 9 is configured so that the groove state can be adjusted by the handle 13 provided on the rotating body 10.

In FIG. 3, the rotating body 10 is rotated once from the rotation start position A along the outer circumference of the pipe 8, that is, 360 degrees, further rotated by a slight angle B, and then slightly rotated. It is configured so as to be reversed by a certain angle B and return to the rotation start position A.

In FIG. 4, the groove 9 acting on the pipe 8 is such that the end face 14 of the pipe 8 has a taper part 15 formed on the end surface 14 by the tapered portion of the groove 9 having a tapered blade on the outer diameter side. To do.

In such a configuration, when the beveling device starts the beveling, the bevel blade 9 is rotated by the electric motor 12 and the end face 14 of the pipe 8 is tapered 15 to perform the beveling process on the pipe 8.
To form.

Then, the rotating blade 10 causes the bevel blade 9 to start to rotate along the outer periphery of the pipe 8 and further rotate by a slight angle B in a state of being rotated by 360 degrees, and then reverse by a slight angle B. Then, it returns to the rotation start position A.

With this operation, the pipe 8 is surely subjected to the groove processing by the groove blade 9, and the rotation angle is accurately controlled. Therefore, if the rotation angle is increased by a slight angle B, This is sufficient, and since the rotation is controlled by the angle even if the rotation speed is adjusted by the control circuit, the accurate rotation angle can be controlled independently.

When detecting the rotation speed of the electric motor 1 as described above, the rotation speed of the electric motor can be calculated from the power supply frequency by using a synchronous motor that rotates in synchronization with the power supply frequency. Therefore, it is easy to detect the rotation speed of the electric motor. Can be done.

When the other electric motor 1 is adopted, a detector 2 such as a tachogenerator for detecting the number of rotations may be provided on the rotation shaft of the electric motor 1 or the like.

[Effects of the Invention] As described above, according to the present invention, the rotation of the bevel blade can be controlled reliably regardless of the load and the speed of the bevel, and the blade blade can be pivoted a little more than one revolution to achieve a sufficient certainty. A groove can be formed, and a groove device with good work efficiency can be configured, and the effect is extremely large industrially.

[Brief description of drawings]

FIG. 1 is a diagram showing a structure of a groove device according to the present invention, and FIG. 2 is a diagram showing an outline of a structure of the groove device,
FIG. 3 is a diagram showing a state of acting on the pipe,
FIG. 4 is a diagram showing the relationship between the pipe and the groove blade. 1 ... Motor, 3 ... Pulse counter, 5 ... Reverse signal generating circuit, 6 ... Control circuit, 7 ... Vise, 8 ... Pipe, 9 ... Grinding blade, 10 ... Rotating body, 12 ... …Electric motor.

Claims (1)

[Claims] 1. A groove device for rotating a groove along the outer periphery of a fixed pipe to perform groove processing, wherein the number of revolutions of an electric motor for driving the rotation of the groove is detected to detect the rotation. A control circuit for calculating a rotation angle is provided. When the rotation angle slightly exceeds 360 degrees from the rotation start position, the calculation circuit generates a reverse rotation signal, and the reverse rotation signal reverses the electric motor. A groove device comprising a circuit, wherein the control circuit reverses the electric motor by an amount that exceeds the electric motor by the reverse rotation signal and returns the groove blade to the rotation start position.