JP2002331427A - Erroneous assembling preventive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically stop a work line, and to announce the fact to an operator when being insufficient in torque and forgetting to fasten a bolt. SOLUTION: In fastening the bolt 17 by a first impact wrench 18A, when a torque sensor 18C detects that the torque does not fall within a prescribed range, a CPU 19C does not output a first OK signal of the effect of being proper in fastening by this impact wrench 18A to a control device 20 via an I/O interface 19B. Thus, in fastening the next bolt 21 by a second impact wrench 22A in a state of not setting a first timer, when the torque falls withing the prescribed range, the CPU 19C outputs a second OK signal of the effect of being proper in fastening torque by the second impact wrench 22A to the control device 20. However, Since the second OK signal comes when determining whether or not a signal is the first OK signal, the torque is determined as insufficient, an NG signal is outputted, a driving source is stopped, and the work line is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing erroneous assembly when a plurality of bolts are tightened for assembling components with an impact wrench.

[0002]

2. Description of the Related Art Conventionally, when a plurality of bolts are tightened in order to assemble parts with an impact wrench, defective products are produced as parts and products if there is insufficient torque or forget to tighten bolts. This is even more so for parts and products that require safety.

[0003]

For this reason, in the past, if the torque was insufficient, the bolt was tightened and then re-tightened by hand with a torque wrench until it was sufficient, and a visual check was carried out to prevent a shortage. I was For this reason, the work efficiency is poor, and there is a limit to the visual check.

[0004] In view of the above, an object of the present invention is to automatically stop a work line or notify a worker when there is a shortage of torque or forgetting to tighten a bolt.

[0005]

SUMMARY OF THE INVENTION Therefore, an erroneous assembly preventing apparatus according to a first aspect of the present invention provides an impact wrench having a plurality of different torques for tightening a plurality of bolts for assembling parts on a work line, It is characterized by comprising a detecting device for detecting a difference in the order of tightening bolts by a wrench, and a control device for controlling the work line to be stopped when the detecting device detects a difference in the order of assembly.

The second erroneous assembly prevention device detects impact wrenches of different torques for tightening a plurality of bolts for assembling parts on a work line, and a difference in the order of bolt tightening by the impact wrenches. And a notifying device for notifying a worker on the work line of the fact that the detecting device detects a wrong assembly order.

The third erroneous assembly preventing apparatus detects impact wrenches having different torques for tightening a plurality of bolts for assembling parts on a work line, and detecting insufficient bolt tightening torque by the impact wrenches. And a control device for controlling the work line to be stopped when the detection device detects insufficient bolt tightening torque.

A fourth erroneous assembly preventing device detects impact wrenches having different torques for tightening a plurality of bolts for assembling parts on a work line, and detecting an insufficient bolt tightening torque by these impact wrenches. And a notifying device for notifying a worker on the work line of the fact that the detecting device detects an insufficient bolt tightening torque.

The erroneous assembly preventing apparatus according to a fifth aspect of the present invention detects impact wrenches having different torques for tightening a plurality of bolts for assembling parts on a work line and forgetting to tighten bolts by these impact wrenches. It is characterized by comprising a detection device and a control device for controlling the work line to be stopped when the detection device detects forgetting to tighten a bolt.

A erroneous assembly preventing apparatus according to a sixth aspect of the present invention detects impact wrenches having a plurality of torques for tightening a plurality of bolts for assembling parts on a work line, and detects forgetting of bolt tightening by the impact wrenches. It is characterized by comprising a detecting device, and a notifying device for notifying a worker on the work line of the fact that the detecting device has detected forgetting to tighten a bolt.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. First, an exploded perspective view of the front seat of the passenger car in FIG. 1 will be described. Reference numeral 1 denotes a cushion pan complete, which is covered with a front cushion cover 3 with a cushioning material 2 made of a urethane resin material placed on the complete 1 to produce a front cushion.

4 is a front backrest frame,
Absorbing material 5 made of urethane resin material on the frame 4
Is placed on the backrest cover 6 to produce a backrest for the front seat.

Reference numerals 10A and 10B denote a pair of rails, and the front cushion assembled as described above is fixed on the pair of rails 10A and 10B. That is, the leg 1 of the cushion pan complete 1 of the front cushion is placed on the horizontal portion 10C of the substantially L-shaped rail 10A on the left side of FIG.
A and 1B are mounted, and three bolts 11 are screwed into the mounting holes 12 of the right rail 10B and the mounting holes 13 of the legs 1A and 1B, and the front cushion is mounted on the pair of rails 10A and 10B. Is fixed.

A backrest is fixed to a front cushion fixed to the pair of rails 10A and 10B via a hinge 15 already fixed by bolts 14 on a work line driven by a driving source (not shown). It will be described in detail below.

First, an operator attaches a bolt 17 to a first impact wrench 18 through a washer 16 with a predetermined torque.
A, the frame 4 of the front backrest is attached to the vertical portion 10D of the left rail 10A. At this time, when the operation unit is pulled to operate the first impact wrench 18A, the switch 18B is operated, so that the I / O interface 19 of the first control unit 19A is operated.
Since an operation signal is input to the CPU 19C via B,
The CPU 19C issues an operation command to the first impact wrench 18A via the I / O interface 19B,
Activate the impact wrench 18A of the bolt 17
Tighten. Then, the torque sensor 18C detects the torque, and the detection signal is transmitted to the I / O interface 1
9B is input to the CPU 19C via the CPU 9B.
9C transmits an OK signal to the control unit 2 via the I / O interface 19B when the tightening torque by the first impact wrench 18A is within a predetermined range and is appropriate.
Output to 0. That is, if the detected value is in a predetermined range between the lower limit and the upper limit of the torque stored in a memory (not shown),
It outputs an OK signal.

Then, the control device 20 determines whether the OK signal is the first signal. If the OK signal is the first OK signal, only the first timer is set (at this time, the second and third timers are set).
The second, third, and fourth timers are not set because they are not OK signals, and the time until the second OK signal is generated by the next normal tightening of the second impact wrench 22A, for example, 2 After a lapse of seconds, a standby state for a second OK signal indicating that the tightening torque by the second impact wrench 22A is appropriate is established. At this time, if the second OK signal is generated by tightening the second impact wrench 22 before the lapse of 2 seconds, it is different when it is determined whether the signal is the first OK signal or not. The work line is stopped by stopping the power source, the lamp is turned on, an alarm is issued by voice, or an alarm such as a buzzer is issued to notify the operator.

Next, the two bolts 21 are tightened with the second impact wrench 22A with a predetermined torque different from the torque of the first impact wrench 18A, thereby the hinge 15 fixed to the front backrest.
To the right rail 10B. At this time, when the operation unit is pulled to operate the second impact wrench 22A, the switch 22B is operated, so that the first control unit 19A is operated.
CPU 19C via I / O interface 19B
Is input to the second impact wrench 22A via the I / O interface 19B, the CPU 19C issues an operation command to the second impact wrench 22A.
A is actuated and the first bolt 21 is tightened.
Then, the torque sensor 22C detects the torque, and a detection signal of the torque is transmitted via the I / O interface 19B.
Since the torque is input to the PU 19C, the CPU 19C outputs the second OK signal to the I / O when the tightening torque by the second impact wrench 22A is within a predetermined range and is appropriate.
Output to the control device 20 via the O interface 19B.

Then, the control device 20 determines whether the OK signal is the second signal, and if the signal is the first second OK signal, sets only the second timer (at this time, the first and third timers are set). The first, third, and fourth timers are not set because they are not OK signals.) For example, after 1 second, a second OK signal indicating that the tightening torque by the second impact wrench 22A for the second time is appropriate Wait state.

Next, the second bolt 21 is tightened with the same torque in the second impact wrench 22A, but when the operating portion is pulled to operate the second impact wrench 22A, the switch 22B is activated. So
Since an operation signal is input to the CPU 19C via the I / O interface 19B of the first control unit 19A, the CP
U19C is connected to the second via I / O interface 19B.
An operation command is issued to the impact wrench 22A, and the second impact wrench 22A is operated to tighten the second bolt 21. Then, the torque sensor 22C detects the torque, and the detection signal is input to the CPU 19C via the I / O interface 19B.
If the tightening torque by the second impact wrench 22A is within a predetermined range and is appropriate, U19C
The K signal is output to the control device 20 via the I / O interface 19B.

Then, the control device 20 determines whether the OK signal is the second signal. If the second signal is the second OK signal, only the third timer is set (at this time, the first and second timers are set). The first, second, and fourth timers are not set because the signal is not an OK signal of 3).
A standby state for the third OK signal indicating that the tightening torque by the impact wrench 23A is appropriate.

Finally, the first impact wrench 18
The bolts 26 are tightened with the third impact wrench 23A at a predetermined torque different from the torque of the second impact wrench A and the second impact wrench 22A, so that the seat belt receptacle 27 is attached to the left rail 10A. At this time, when the operation unit is pulled to operate the third impact wrench 23A, the switch 23B is operated.
CPU 2 via 4A I / O interface 24B
Since the operation signal is input to the 4C, the CPU 24C sets the I / O
An operation command is issued to the third impact wrench 23A via the O interface 24B to activate the third impact wrench 23A and tighten the bolt 26. When the torque sensor 23C detects the torque, the detection signal is output to the C / C via the I / O interface 24B.
When the torque is input to the PU 24C and the tightening torque by the third impact wrench 23A is within a predetermined range and is appropriate, the CPU 24C outputs a third OK signal to the control device 20 via the I / O interface 24B.

Then, the control device 20 determines whether the OK signal is the third one, and if it is the third OK signal, sets only the fourth timer (at this time, the first and second timers are set).
, The first, second, and third timers are not set). For example, after the elapse of 2 seconds, the first impact signal waits for the first OK signal indicating that the tightening torque by the first impact wrench 18A is appropriate. State.

Here, as described above, the bolts 17 are tightened with the first impact wrench 18A via the washers 16 with a predetermined torque, so that the frame 4 of the front backrest is connected to the vertical portion 10 of the left rail 10A.
If the torque sensor 18C does not have the torque within the predetermined range when the torque sensor 18C is attached to the D, a detection signal indicating that the torque is within the predetermined range is not input to the CPU 19C. Is not output to the control device 20 via the I / O interface 19B.

Therefore, in the state where the first timer is not set, the next bolt 21 is connected to the second impact wrench 22.
A, by attaching the hinge 15 fixed to the front backrest to the right rail 10B,
When the torque sensor 22C detects that the torque is within a predetermined range, as described above, the CPU 19C
Outputs a second OK signal indicating that the tightening torque by the second impact wrench 22A is appropriate to the control device 20 via the I / O interface 19B.

However, if the first timer is not set (and two seconds have not elapsed), the second timer
It is not determined whether the signal is an OK signal or a third OK signal, but it is determined whether the signal is a first OK signal.
Therefore, when determining whether the signal is the first OK signal, the second
Since the OK signal is received, it is determined that the torque is insufficient (insufficient torque is detected), the answer is “NO”, the NG signal is output, the drive source is stopped to stop the work line,
The worker is notified by turning on a lamp, issuing an alarm by voice, or issuing an alarm such as a buzzer.

This notification indicates that the tightening at the first impact wrench 18A is insufficient in torque.
As a result, the second OK signal is generated before the first OK signal is issued.
Since the signal is issued, the same phenomenon occurs even if the tightening procedure is incorrect or the bolt 17 is missing.

Therefore, as described above, according to the present invention, the bolt tightening torque is insufficient, the tightening procedure is incorrect,
It is possible to detect that the bolt is out of stock, and in such a case, stop the work line and notify the worker by lighting a lamp or the like.

For this reason, when the reset switch 25 is pressed after the above-mentioned problem is solved, the control device 20 stops outputting the NG signal. As a result, the operation of the work line can be restarted, the lamp is turned off, and the alarm is stopped.

As described above, the present invention can reliably prevent a product or part from being shipped out of stock with insufficient torque, and is particularly suitable for managing the installation of important security parts and the like. .

While the embodiments of the present invention have been described above, various alternatives, modifications or variations are possible for those skilled in the art based on the above description, and the present invention is not limited to the above-described various embodiments without departing from the spirit thereof. It is intended to cover alternatives, modifications or variations.

[0031]

As described above, according to the present invention, the work line can be automatically stopped or the worker can be notified when there is a shortage of torque or forgetting to tighten a bolt. For this reason, it is possible to perform a reliable mounting by re-tightening the torque to a sufficient level.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a front seat.

FIG. 2 is a system configuration diagram.

FIG. 3 is a diagram showing a flowchart.

[Explanation of symbols]

 18A, 22A, 23A Impact wrench 18C, 22C, 23C Torque sensor 19A, 24A Control unit 20 Control device

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C030 DA03 DA04 DA10 3C038 AA01 AA03 AA09 BC02 CA06 CB01 CC04 CC08 EA01 EA02 EA06

Claims (6)

[Claims] An impact wrench for tightening a plurality of bolts for assembling parts on a work line, a plurality of impact wrenches having different torques, a detection device for detecting a difference in a bolt tightening order by the impact wrenches, and the detection device A control device for controlling the work line to be stopped when a wrong mounting order is detected. 2. A plurality of impact wrenches with different torques for tightening a plurality of bolts for assembling parts on a work line, a detecting device for detecting a difference in a bolt tightening order by the impact wrenches, and the detecting device An erroneous assembly prevention device, comprising: a notifying device for notifying a worker on the work line of the detection of a misplaced order when the difference is detected. 3. An impact wrench having a plurality of different torques for tightening a plurality of bolts for assembling parts on a work line, a detecting device for detecting an insufficient bolt tightening torque by the impact wrench, and the detecting device comprising a bolt A control device for controlling the work line to be stopped when an insufficient tightening torque is detected. 4. An impact wrench having a plurality of different torques for tightening a plurality of bolts for assembling parts on a work line, a detecting device for detecting an insufficient bolt tightening torque due to the impact wrench, and the detecting device comprising a bolt An erroneous assembling prevention device, comprising: a notifying device for notifying a worker on the work line of the fact that the tightening torque is insufficient. 5. An impact wrench for tightening a plurality of bolts for assembling parts on a work line, a plurality of impact wrenches having different torques, a detecting device for detecting forgetting to tighten a bolt by the impact wrench, and the detecting device comprising a bolt tightening device. A control device for controlling the work line to be stopped when the forgetting is detected. 6. A plurality of impact wrenches with different torques for tightening a plurality of bolts for assembling parts on a work line, a detecting device for detecting forgetting to tighten bolts by these impact wrenches, and the detecting device includes a bolt tightening device. And a notifying device for notifying a worker on the work line of the forgetting when the forgetting is detected.