JPH08192372A - Nut runner - Google Patents

Abstract

PURPOSE: To quickly and securely perform the nut and bolt fastening work. CONSTITUTION: A nut runner 1 has a torque detecting device 4 for detecting the torque value at the time of fastening a nut and a bolt, a torque comparing circuit 5 for comparing the torque value detected by the torque detecting device 4 with the previously set torque value, a counter circuit 6 for counting one when the torque value, which is detected by the torque comparing circuit 5, exceeds the preset torque value, and a numeric display device 7 for displaying this numeric value.

Description

Detailed Description of the Invention

[0001]

[Industrial application] A nut runner for tightening nut bolts.

[0002]

2. Description of the Related Art A nut runner is used for quickly tightening a nut bolt for connecting a reinforcing bar to a reinforcing bar of a bridge or a building. Further, the conventional nut runner is provided with a nut housing capable of accommodating the nut bolt for tightening the nut bolt, an electric motor for driving the nut housing, and a drive / control circuit for driving and controlling the electric motor. . The drive / control circuit can manage the torque for tightening the nut bolt. That is, it is possible to confirm that the nut bolt is tightened with the preset torque value by stopping the electric motor. Therefore, a large number of nut bolts can be quickly tightened by this nut runner.

[0003]

However, in the conventional nut runner, when the tightening work is performed in a state or place where it is difficult to confirm the stop of the electric motor, there is no function to judge whether the tightening is performed with the set torque value. . Also, there was currently no way to find out how many nut bolts were tightened. In other words, when tightening a large number of nut bolts, the only way to check if the number of nut bolts to be tightened and the actual number of tightened bolts match was to visually check. As described above, there is a possibility that the tightening torque is insufficient and the tightening is forgotten.

[0004]

Therefore, according to the present invention, a torque detecting device for detecting a torque value when tightening a nut bolt, a torque value detected by the torque detecting device, and a preset torque value. A nut runner comprising: a torque comparison circuit for comparing the above and a count circuit for incrementing by 1 when the torque value detected by the torque comparison circuit becomes equal to or greater than a set torque value. Alternatively, it has the torque detection device, the torque comparison circuit, the count circuit, and a voice / light emitting device that generates voice or light when the torque value detected by the torque comparison circuit becomes equal to or greater than a set torque value. A nut runner is provided.

[0005]

In the first aspect, the count circuit is reset to set the numerical value to n = 0. Then, the nut bolt is tightened by the nut runner. Then, the tightening torque is detected by the torque detecting device. Then, the torque comparison circuit compares the detected torque value with the preset torque. Then, when it is confirmed that the detected torque value is tightened with a torque equal to or more than a preset torque, the numerical value is changed to n = n + 1 by the counting circuit after the nut bolt tightening work is completed.
Is counted and displayed on the numerical display device.
Then tighten the next nut bolt.

In the second aspect, when it is confirmed by the torque comparison circuit that the detected torque value is tightened at a torque equal to or more than a preset torque as in the first aspect, the voice / light emitting device outputs the voice or the light. Generate. Then, the tightening work of the nut bolt is completed. Then, the count circuit increments the numerical value by 1, that is, counts n = n + 1 (n is a natural number) and displays the numerical value on the numerical display device. Then tighten the next nut bolt.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a structural diagram of a nut runner according to the present invention. FIG. 2 is a flowchart showing the tightening operation of the nut bolt according to the present invention.

In FIG. 1, a nut runner 1 is an electric motor 2 for driving a nut housing for tightening nut bolts, a drive / control circuit 3 for driving and controlling the nut runner 1, and a torque detecting device 4. It has a torque comparison circuit 5, a count circuit 6, and a numerical display device 7.

The torque detector 4 detects the torque value when the nut runner 1 is tightening the nut bolt. To detect the torque value, for example, the value of the current flowing through the winding of the electric motor 2 may be detected and converted into the torque value. The torque comparison circuit 5 compares the torque value detected by the torque detection device 4 with a preset torque value. When the signal output from the torque comparison circuit 5 is input, the count circuit 6 increments the numerical value by 1. That is, n
= N + 1 (n is a natural number) is counted. The numerical value display device 7 displays the numerical value counted by the counting circuit 7.

In FIG. 2, first, in step A1,
The count circuit 6 is reset to set the numerical value to n = 0 (n is a natural number). Then, in step A2, the nut runner 1 is driven to start tightening the nut bolt. Then, in step A3, the preset torque value and the torque value detected by the torque detection device 4 are compared by the torque comparison circuit 5, and when the detected torque value becomes equal to or larger than the set torque value, it is counted. An arbitrary signal is output to the circuit 6. Then, in step A4, the tightening of the nut bolt is completed. And step A
In step 5 and step A6, the counting circuit 6 counts the numerical value at n = n + 1 after the tightening of the nut bolt is completed, and displays this numerical value on the numerical display device 7. And
In step A7, when the next nut bolt tightening operation is performed, the process returns to step A2.

When it is difficult to judge whether the detected torque value is equal to or larger than the set torque value, the order of the operations of step A4, step A5 and step A6 may be exchanged. That is, the tightening operation of the nut bolt may be ended after confirming whether the numerical value is displayed on the numerical display device 7.

A second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a structural diagram of the nut runner according to the present invention. FIG. 4 is a flow chart showing the tightening operation of the nut bolt in the present invention.

In FIG. 3, as in the first embodiment, the nut runner 1 is an electric motor 2, a drive / control circuit 3, a torque detection device 4, a torque comparison circuit 5, a count circuit 6, and a numerical display. With device 7, and voice
It has a light emitting device 8.

The voice / light emitting device 8 receives a signal output from the torque comparison circuit 5 and outputs a voice (for example, a buzzer),
Alternatively, it is a device that generates light (for example, an LED).

In FIG. 4, first, step B1, step B2, and step B3 perform the same operations as step A1, step A2, and step A3 of FIG. 2 of the first embodiment, respectively. Then, in step B4, the sound / light emitting device 8 is operated to generate sound or light. Then, in step B5, after confirming that the voice / light emitting device 8 has operated, the tightening of the nut bolt is completed. Then, Step B6, Step B7, and Step B8 are
Operations similar to step A5, step A6, and step A7 in FIG. 2 are performed.

In the first embodiment, when it is difficult to determine whether or not the tightening torque of the nut bolt has reached the preset torque or more, it can be confirmed by the numerical display device. In the second embodiment, it is possible to make a more reliable and quick decision by voice or light.

[0017]

According to the present invention, the tightening operation of the nut bolt can be performed more quickly and reliably.

[0018]

[Brief description of drawings]

FIG. 1 is a structural diagram of a nut runner according to the present invention.

FIG. 2 is a flowchart showing a tightening operation of a nut bolt according to the present invention.

FIG. 3 is a structural diagram of a nut runner according to the present invention.

FIG. 4 is a flowchart showing a tightening operation of the nut bolt according to the present invention.

[Explanation of symbols]

 1, nut runner 2, electric motor 3, electric motor drive circuit 4, torque detection device 5, torque comparison circuit 6, count circuit 7, numerical display device 8, voice / light emitting device

Claims (2)

[Claims] 1. In a nut runner for tightening a nut bolt, a torque detecting device for detecting a torque value when tightening the nut bolt is compared with a torque value detected by the torque detecting device and a preset torque value. A nut runner, comprising: a torque comparison circuit that performs a torque comparison circuit; and a count circuit that increases by 1 when the torque value detected by the torque comparison circuit exceeds a set torque value. 2. The torque detecting device, the torque comparing circuit, the counting circuit, and a voice / light emitting device that emits voice or light when the torque value detected by the torque comparing circuit is equal to or greater than a set torque value. The nut runner according to claim 1, further comprising a device.